WO2022092059A1 - Thread tension device and sewing device - Google Patents
Thread tension device and sewing device Download PDFInfo
- Publication number
- WO2022092059A1 WO2022092059A1 PCT/JP2021/039421 JP2021039421W WO2022092059A1 WO 2022092059 A1 WO2022092059 A1 WO 2022092059A1 JP 2021039421 W JP2021039421 W JP 2021039421W WO 2022092059 A1 WO2022092059 A1 WO 2022092059A1
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- WIPO (PCT)
- Prior art keywords
- thread
- rotating body
- thread tension
- contact
- axial direction
- Prior art date
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Images
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B47/00—Needle-thread tensioning devices; Applications of tensometers
- D05B47/02—Manually-controlled tensioning devices
Definitions
- This disclosure relates to a thread tensioning device and a sewing device.
- Patent Document 1 discloses a rotary yarn tensioning device.
- the rotary yarn tensioning device has a rotary yarn tensioning dish and a contact member. Sewing thread is wound around the rotating thread tension plate.
- the rotary thread tension plate rotates according to the feeding of the sewing thread.
- the abutting member contacts both sides of the rotary thread tension pan.
- the rotary thread tensioning device applies tension to the sewing thread by the sliding friction force acting on the abutting member when the rotating thread tensioning dish rotates.
- the contact member may wear as the rotary thread tension pan rotates with respect to the contact member.
- the rotary thread tensioning device has a problem that the tension of the sewing thread cannot be stably maintained.
- An object of the present disclosure is to provide a rotary thread tensioning device capable of stably maintaining the tension of the sewing thread, and a sewing device provided with the thread tensioning device.
- the thread tensioning device has a winding portion around which sewing thread is wound, and has a thread tensioning plate that can be rotated by the movement of the sewing thread wound around the winding portion, and a thread tensioning plate.
- a thread tension shaft extending axially through the center of rotation, rotatably supported with respect to the thread tension shaft, and adjacent to at least one side and the other side of the shaft direction with respect to the thread tension pan. Then, the rotating body that rotates according to the rotation of the thread tension plate and the outer side of the rotating body that is the portion opposite to the inner contact portion that is the contact portion with the thread tension plate in the axial direction.
- the abutting member that comes into contact with the contact portion, the pressing member that presses the abutting member against the rotating body, and applies a frictional load when the rotating body and the thread tension pan are rotated, and the pressing member is pressed against the abutting member. It is characterized by being provided with an adjusting member for adjusting the pressing force.
- the thread tensioning device can suppress wear of the contact member in response to the rotation of the thread tensioning plate by interposing a rotating body between the thread tensioning plate and the contact member. Therefore, the thread tensioning device can suppress fluctuations in the frictional load applied to the thread tensioning dish, so that the tension of the sewing thread can be stably maintained.
- the thread tension plate may be provided with a restraining portion for suppressing slippage of the sewing thread on a contact surface that is wound around the winding portion and is in contact with the sewing thread.
- the thread tensioning device can prevent the sewing thread from slipping with respect to the winding portion by the restraining portion.
- the rotating body has a first part and a second part adjacent to each other in the axial direction, the outer diameter of the first part is larger than the outer diameter of the second part, and the contact member is ,
- the second portion of the rotating body may be inserted through the through hole.
- the difference between the outer diameter and the inner diameter of the contact member can be reduced, and the contact member can be held from the inside of the through hole by the rotating body, so that one-sided wear or breakage of the contact member can be reduced.
- the rotating body includes a first rotating body provided on one of the axial directions of the thread tension pan and a second rotating body provided on the other side of the axial direction, and the contact member is a contact member.
- the first contact member that comes into contact with the first rotating body and the second contact member that comes into contact with the second rotating body may be included. In this case, since an appropriate friction load can be applied to the thread tension pan and the rotating body from both sides in the axial direction, the tension applied to the sewing thread can be easily maintained in an appropriate state.
- the rotating body may include a bearing interposed between the rotating body and the thread tension shaft.
- the thread tensioning device can smoothly rotate the rotating body with respect to the thread tensioning shaft.
- the first rotating body is provided with a first recess on the surface facing the other, and the second rotating body is provided with a second recess on the surface facing the other.
- a bearing interposed between the thread tension shaft and the thread tension shaft is further provided, and the bearing may be sandwiched between the first recess and the second recess. In this case, the intrusion of dust or the like into the bearing can be prevented by a simple structure.
- the adjusting member may include at least a solenoid, and the pressing force may be adjusted by adjusting the position of the pressing member in the axial direction according to the driving of the solenoid.
- the adjusting member can easily adjust the magnitude of the frictional load applied to the thread tension pan and the rotating body by the solenoid.
- the adjusting member is arranged on the side opposite to the side where the contact member is arranged in the axial direction with respect to the holding member, and the knob capable of adjusting the position in the axial direction and the said.
- the pressing member has at least a compression spring interposed between the knob and the pressing member, and the pressing member presses the contact member against the rotating body by the elastic force of the compression spring, and the adjusting member , The pressing force may be adjusted by adjusting the position of the knob in the axial direction.
- the adjusting member can easily adjust the magnitude of the frictional load applied to the thread tension pan and the rotating body by adjusting the position of the knob.
- the adjusting member may include at least a pulse motor, and the pressing force may be adjusted by adjusting the position of the pressing member in the axial direction according to the driving of the pulse motor.
- the adjusting member can easily adjust the magnitude of the frictional load applied to the thread tension pan and the rotating body by a pulse motor.
- the sewing device is characterized by including a thread tensioning device according to the first aspect, and a needle bar that extends in the vertical direction, has a sewing needle that can be attached to the lower end, and can move up and down. And. According to the second aspect, the same effect as that of the first aspect can be obtained.
- FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 as viewed from the direction of the arrow. It is an exploded perspective view of the thread tensioning apparatus 3A. It is a photograph which took the winding part 31A of the thread tensioning apparatus 3A. It is a perspective view of the thread tensioning apparatus 3A. It is a side view of the thread tensioning apparatus 3A. It is a graph which shows the relationship between the sewing time and the tension of a needle thread 9. It is a graph which shows the relationship between the sewing time and the wear amount of the thread tensioning apparatus 3A. This is a photograph of the seams.
- the sewing machine 1A is a gantry sewing machine capable of sewing on an object to be sewn. As shown in FIG. 1, the sewing machine 1A has a bed portion 21, a pair of pedestal portions 22, a beam portion 23, a head portion 24, and a moving mechanism 25.
- the bed portion 21 has a base portion 21A and a frame body 21B.
- the base 21A has a substantially rectangular shape.
- the upper surface of the base 21A forms a horizontally extending flat holding surface 21U.
- a holding plate 21P extending forward along the holding surface 21U is provided at the front end of the base 21A.
- a bellows 21R extending in the front-rear direction is provided near the right end of the holding surface 21U.
- a bellows 21L extending in the front-rear direction is provided near the left end of the holding surface 21U.
- the bellows 21R and 21L extend linearly on both front and rear sides of the pair of front-rear movement mechanisms 251 described later, respectively, between the front end portion and the rear end portion of the holding surface 21U.
- the bellows 21R and 21L expand and contract as the pair of front-back movement mechanisms 251 reciprocate in the front-back direction.
- the frame body 21B is a grid-like structure and supports the base portion 21A from below.
- the pair of pedestal portions 22 has pedestal portions 22R and 22L.
- the pedestal portions 22R and 22L are substantially square pillars, respectively.
- the pedestal portion 22R extends upward from a position at the right end of the base portion 21A of the bed portion 21 and in front of the center in the front-rear direction.
- the pedestal portion 22R is located on the right side of the bellows 21R in the left-right direction.
- the pedestal portion 22L extends upward from the left end portion of the base portion 21A of the bed portion 21 and a position in front of the center in the front-rear direction.
- the pedestal portion 22L is located on the left side of the bellows 21L in the left-right direction.
- the pedestal portions 22R and 22L are separated in the left-right direction.
- the beam portion 23 is erected between the pedestal portions 22R and 22L, respectively.
- the beam portion 23 extends in the left-right direction between the pair of pedestal portions 22.
- the beam portion 23 has a housing 23U.
- the housing 23U extends between the upper end portions and the rear end portions of the pedestal portions 22R and 22L, respectively.
- the rail 220 is provided in the space surrounded by the pedestal portions 22R and 22L and the housing 23U.
- the rail 220 has a rod shape and is erected between the pedestal portions 22R and 22L.
- the rail 220 supports the head 24, which will be described later, so as to be movable in the left-right direction.
- the bellows 23F is provided over the front ends of the pedestal portions 22R and 22L, the housing 23U, and the left and right ends of the head 24 described later.
- the bellows 23F covers the rail 220 supporting the head 24 from the front side.
- the bellows 23F expands and contracts as the head 24 reciprocates in the left-right direction along the rail 220.
- the head 24 is provided on the front side with respect to the beam portion 23.
- the head portion 24 includes a needle bar 24A, a presser foot 24B, a balance mechanism 24C, a thread tensioning device 3A, an auxiliary thread tensioning device 26, thread guides 27, 28 (see FIG. 2) and the like.
- the needle bar 24A extends in the vertical direction, and a sewing needle (not shown) can be attached to the lower end portion.
- the needle bar 24A is movable in the vertical direction.
- the presser foot 24B has a through hole through which the sewing needle passes according to the movement of the needle bar 24A, and presses the object to be sewn from above.
- the balance mechanism 24C operates in response to the vertical movement of the needle bar 24A and pulls up the needle thread 9.
- the thread tensioning device 3A adjusts the tension of the needle thread 9. Details of the thread tensioning device 3A will be described later.
- the auxiliary thread tensioner 26 is provided on the front surface of the head 24 and above the thread tensioning device 3A.
- the auxiliary thread tensioner 26 winds around the needle thread 9 extending from a thread piece (not shown) and guides the needle thread 9 toward the lower thread tensioner 3A.
- the thread guide 27 is provided on the front surface of the head 24 and on the left side of the thread tensioning device 3A.
- the thread guide 28 is provided on the front surface of the head 24 and above the thread tension device 3A. The thread guides 27 and 28 each come into contact with the needle thread 9 extending from the thread tensioning device 3A and guide them toward the balance mechanism 24C.
- the rail 220 in the beam portion 23 supports the head portion 24 so as to be movable in the left-right direction. Therefore, the head 24 can move in the left-right direction along the front end portion of the beam portion 23.
- a kettle mechanism (not shown) is provided below the head 24 and inside the base 21A.
- the hook mechanism has a needle plate provided with a needle hole through which the sewing needle passes when the needle rod 24A is moved downward. The hook mechanism can move in the left-right direction in synchronization with the head 24.
- the moving mechanism 25 is provided above the holding surface 21U of the bed portion 21.
- the moving mechanism 25 moves the sewn object placed on the bed portion 21 in the front-rear direction.
- the moving mechanism 25 has a support portion 250, a lower feed plate 25B, and a pair of front-back moving mechanisms 251.
- the support portion 250 extends in the left-right direction between the bellows 21R and 21L provided on the holding surface 21U of the bed portion 21.
- a pair of front-back moving mechanisms 251 are provided at both left and right ends of the support portion 250.
- the pair of front-back moving mechanisms 251 have a front-back moving mechanism 251R provided at the right end portion of the support portion 250 and a front-back moving mechanism 251L provided at the left end portion of the support portion 250.
- the front-back movement mechanism 251R is connected to a belt (not shown) provided below the bellows 21R.
- the front-back movement mechanism 251L is connected to a belt (not shown) provided below the bellows 21L.
- the pair of front-rear movement mechanisms 251 move the support portion 250 in the front-rear direction in response to the synchronous rotation of the belts connected to the front-rear movement mechanisms 251R and 251L.
- the support portion 250 is connected to the lower feed plate 25B inside the pair of front-back movement mechanisms 251.
- the lower feed plate 25B extends from the lower vicinity of the support portion 250 toward the front side in parallel with the holding surface 21U.
- the support portion 250 further has an air cylinder (not shown) in the center in the left-right direction. The air cylinder can move up and down on the upper feed plate (not shown).
- the upper feed plate can hold the sewn object between the upper feed plate and the lower feed plate 25B in a state of being moved downward.
- An operation unit 29 is provided at the front end of the base 21A.
- the operation unit 29 includes a display unit and a push button.
- the operation unit 29 displays the status of the sewing machine 1A or the like via the display unit, and accepts an input operation by the operator via a push button.
- a control unit including a control board (not shown) is provided inside the frame 21B.
- the control unit controls the entire sewing operation of the sewing machine 1A. For example, the control unit detects an input operation received via the operation unit 29 and controls the adjustment member 4A described later.
- the thread tensioning device 3A includes a thread tensioning dish 31, rotating bodies 32A and 32B (collectively referred to as rotating bodies 32), and contact members 33A and 33B (collectively referred to as contact members 33). ), Pressing members 34A and 34B (collectively referred to as pressing members 34), a cover 35, a thread take-up spring 36, a thread tension shaft 37, a thread tension base 38, a pressing shaft 39, and an adjusting member 4A.
- the front-back direction is also referred to as an axial direction.
- the thread tension plate 31 has a base portion 311 and a winding portion 31A.
- the base 311 has a circular substantially plate shape and is orthogonal to the axial direction.
- the direction extending in the radial direction from the center along the plane of the base 311 is referred to as a radial direction.
- a circular through hole 310 is provided in the center of the base 311.
- the winding portion 31A extends outward from the peripheral end portion of the base portion 311.
- the winding portion 31A is composed of a plurality of first ribs Q1 and a plurality of second ribs Q2 extending in directions intersecting each other. As shown in FIG.
- each of the plurality of first ribs Q1 is inclined forward with respect to the radial direction.
- Each of the plurality of second ribs Q2 is inclined backward with respect to the radial direction.
- the first rib Q1 and the second rib Q2 are arranged alternately along the peripheral end of the base 311.
- the plurality of first ribs Q1 and the plurality of second ribs Q2 intersect in the vicinity of the base 311.
- the axial distance between the plurality of first ribs Q1 and the plurality of second ribs Q2 increases as the distance from the base 311 increases.
- Metal is used as the material of the thread tension plate 31.
- the needle thread 9 (see FIG. 2) is in contact with the winding portion 31A on the rear surface of the plurality of first ribs Q1 and the front surface of the plurality of second ribs Q2 (hereinafter referred to as contact surface P). It is wrapped in the state that it is. At this time, the needle thread 9 is in a state of being extended in a zigzag manner by the plurality of first ribs Q1 and the plurality of second ribs Q2. As shown in FIG. 5B, the contact surface P is provided with a restraining portion T1 for suppressing the slip of the needle thread 9.
- the restraining portion T1 is a plurality of grooves extending in parallel with each other. Each groove extends concentrically with respect to the center of the base 311.
- the radial spacing of the grooves is uniform.
- the pitch between each of the plurality of grooves is set to any value of 10 ⁇ m or more and 100 ⁇ m or less. In this embodiment, the pitch is 0.1 mm.
- the plurality of grooves are formed on the contact surface P by laser irradiation. Each groove extends concentrically with respect to the center of the base 311.
- the contact surface P is subjected to surface hardening treatment by heat treatment or the like. It should be noted that each of the plurality of grooves formed by the laser irradiation is formed in the hardened layer formed by the surface hardening treatment and does not break the hardened layer. As shown in FIG. 5D, a plurality of dross having an outer diameter of several ⁇ m are formed in the plurality of grooves formed by laser irradiation.
- the thread tension shaft 37 has a substantially columnar shape and extends along the axial direction.
- the thread tension shaft 37 has a base shaft portion 37A and a pair of split shaft portions 37B.
- the base shaft portion 37A has a columnar shape and extends along the axial direction.
- the base shaft portion 37A has a first base shaft portion 371 and a second base shaft portion 372 having different diameters.
- the diameter of the first shaft portion 371 is slightly larger than the diameter of the second base shaft portion 372.
- the first shaft portion 371 is adjacent to the second base shaft portion 372 on the front side.
- a through hole 370 is provided in the center of the base shaft portion 37A.
- the cross-sectional shape of the through hole 370 is circular, and penetrates the base shaft portion 37A in the axial direction.
- a pressing shaft 39 which will be described later, is inserted through the through hole 370.
- the pair of split shaft portions 37B extend forward from the portion of the front end portion of the base shaft portion 37A where the opening of the through hole 370 is not formed.
- the cross-sectional shape when each split shaft portion 37B is cut in a plane orthogonal to the axial direction is a bow shape.
- Each plane portion of the pair of split shaft portions 37B faces in a direction orthogonal to the axial direction.
- the center and diameter of the virtual cylindrical portion passing through each curved portion of the pair of split shaft portions 37B are referred to as the center and diameter of the pair of split shaft portions 37B, respectively.
- the diameter of the pair of split shaft portions 37B is smaller than the diameter of the through hole 310 of the thread tension pan 31.
- the pair of split shaft portions 37B penetrate through the through hole 310 of the thread tension plate 31 in the axial direction and rotatably support the thread tension plate 31.
- the centers of the base shaft portion 37A and the pair of split shaft portions 37B each pass through the rotation center of the thread tension pan 31.
- ⁇ Rotating body 32> As shown in FIGS. 3 and 4, the rotating body 32A is adjacent to the thread tension plate 31 on the front side, and the rotating body 32B is adjacent to the thread tension plate 31 on the rear side.
- the shapes of the rotating bodies 32A and 32B are substantially the same.
- the details will be described by taking the rotating body 32A as an example, and the detailed description of the rotating body 32B will be omitted.
- the rotating body 32A has a first part 321 and a second part 322.
- the first part 321 and the second part 322 are each in the shape of a circular plate having a predetermined thickness and are orthogonal to the axial direction.
- the first part 321 and the second part 322 are adjacent to each other in the axial direction.
- the outer diameter of the first part 321 is larger than the outer diameter of the second part 322.
- the material of the rotating body 32A is not particularly limited, but as an example, a resin (POM, fluororesin, etc.) or a metal (stainless steel, heat-treated steel, the same material as the thread tension pan 31, etc.) is used.
- a through hole 320 having a circular cross-sectional shape is provided at the center of the rotating body 32A.
- the through hole 320 axially penetrates the rotating body 32A between the front end portion of the first portion 321 and the rear end portion of the second portion 322.
- the surface of the first part 321 on the side opposite to the side adjacent to the second part 322 in the axial direction is referred to as an inner contact part S1.
- a recess 320A recessed toward the second portion 322 side is provided around the opening of the through hole 320 in the inner contact portion S1.
- the cross-sectional shape of the recess 320A is circular and has a diameter larger than the diameter of the through hole 320.
- the surface of the first part 321 facing the inner contact portion S1 in the axial direction is referred to as an outer contact portion S2.
- the rotating bodies 32A and 32B are arranged with their inner contact portions S1 facing the thread tension plate 31 side.
- the inner contact portions S1 of the rotating bodies 32A and 32B each come into contact with the base portion 311 of the thread tension pan 31 from both sides in the axial direction.
- the rotating bodies 32A and 32B sandwich the thread tension plate 31 from both sides in the axial direction.
- the rotating bodies 32A and 32B hold the bearing 30 in the region surrounded by the respective recesses 320A.
- the bearing 30 is interposed between the rotating bodies 32A and 32B and the thread tension shaft 37 penetrating the through holes 320 of the rotating bodies 32A and 32B, respectively. Therefore, the rotating bodies 32A and 32B are rotatably supported by the thread tension shaft 37 via the bearing 30, and can rotate following the rotation of the thread tension plate 31.
- the abutting members 33A and 33B have a circular substantially plate shape and are orthogonal to the axial direction.
- a circular through hole 330 sufficiently larger than the diameter of the thread tension shaft 37 is provided at the center of each of the contact members 33A and 33B.
- the second portion 322 of the rotating body 32A is inserted into the through hole 330 of the contact member 33A.
- the contact member 33A is adjacent to the front side of the first part 321 of the rotating body 32A and comes into contact with the outer contact portion S2 of the rotating body 32A.
- the second portion 322 of the rotating body 32B is inserted into the through hole 330 of the abutting member 33B.
- the contact member 33B is adjacent to the rear side of the first part 321 of the rotating body 32B and comes into contact with the outer contact portion S2 of the rotating body 32B.
- the material of the abutting member 33 is not particularly limited, but as an example, carbon, ceramic, resin (for example, POM, fluororesin, polyamide, polyimide, polyamideimide, polyacetal, oil-impregnated resin, etc.), fiber material (for example, fluorofiber, etc.) Woven or non-woven fabric (felt) of glass fiber, steel fiber, carbon fiber, etc. is used. Further, they may be used in the form of a single substance or a composite thereof depending on the required frictional force, durability, and improvement in handleability.
- the pressing member 34A is adjacent to the abutting member 33A on the front side, and the pressing member 34B is adjacent to the abutting member 33B on the rear side.
- the shapes of the pressing members 34A and 34B are the same.
- the details will be described by taking the presser member 34B as an example, and the detailed description of the presser member 34A will be omitted.
- the pressing member 34B has a base portion 341.
- the base portion 341 has a circular plate shape having a predetermined thickness and is orthogonal to the axial direction.
- a recess 342 is provided on the surface of the base portion 341 on the side adjacent to the contact member 33B.
- the cross-sectional shape of the recess 342 is circular.
- the surface of the base portion 341 on the side adjacent to the contact member 33B is referred to as an inner contact portion S3.
- the diameter of the recess 342 is slightly larger than the diameter of the second portion 322 of the rotating body 32B.
- a pair of through holes 340 are provided at the bottom of the recess 342.
- the cross-sectional shape of each of the pair of through holes 340 is the same as the cross-sectional shape of each of the pair of split shaft portions 37B of the thread tension shaft 37.
- the pressing member 34A is arranged with the inner contact portion S3 facing the contact member 33A side.
- the inner contact portion S3 of the presser member 34A comes into contact with the contact member 33A.
- the pressing member 34A presses the contact member 33A against the first part 321 of the rotating body 32A.
- the second portion 322 of the rotating body 32A is arranged in the region inside the recess 342 of the pressing member 34A.
- the pressing member 34B is arranged with the inner contact portion S3 facing the contact member 33B.
- the inner contact portion S3 of the presser member 34B comes into contact with the contact member 33B.
- the second portion 322 of the rotating body 32B is arranged in the region inside the recess 342 of the pressing member 34B.
- the pressing member 34B presses the contact member 33B against the first part 321 of the rotating body 32B.
- a pair of split shaft portions 37B of the thread tension shaft 37 penetrate each of the pair of through holes 340 of the presser members 34A and 34B in the axial direction.
- the front ends of the pair of split shaft portions 37B project forward from the pair of through holes 340 of the pressing member 34A.
- the pressing members 34A and 34B are held by the thread tension shaft 37.
- the rotation of the presser members 34A and 34B is suppressed by the thread tension shaft 37.
- the thread tension dish 31 and the rotating bodies 32A and 32B are rotatable with respect to the thread tension shaft 37. Therefore, the pressing members 34A and 34B can apply a friction load to the rotation of the thread tension pan 31 and the rotating bodies 32A and 32B by pressing the contact members 33A and 33B against the rotating bodies 32A and 32B.
- the cover 35 is a so-called set collar, and is adjacent to the pressing member 34A on the front side.
- the cover 35 has a columnar base 351.
- the base 351 extends along the axial direction.
- a through hole 350 extending in the axial direction is provided at the center of the base portion 351.
- the base 351 includes a slit 352 extending axially along the side surface.
- the slit 352 penetrates through the through hole 350.
- the base 351 further comprises a screw 35B for adjusting the spacing of the slits 352. The distance between the slits 352 and the diameter of the through hole 350 can be adjusted according to the degree of screwing of the screw 35B.
- the thread take-up spring 36 has a coil spring portion 36A and a thread hook portion 36B.
- the coil spring portion 36A is a torsion spring, and the lumen extends along the axial direction.
- the coil spring portion 36A is wound around the first base shaft portion 371 of the base shaft portion 37A of the thread tension shaft 37 (see FIG. 3).
- the thread hook portion 36B extends from one end of the wire of the coil spring portion 36A.
- the thread hooking portion 36B is bent so that the needle thread 9 (see FIG. 2) can be hooked.
- the thread tensioning table 38 has a columnar base 381.
- the base 381 extends along the axial direction. As shown in FIG. 3, the base portion 381 is adjacent to the pressing member 34B on the rear side. At the center of the base portion 381, a through hole 380 extending in the axial direction is provided. A recess 38A is provided around the opening of the through hole 380 in the front surface of the base portion 381 (see FIG. 4). The cross-sectional shape of the recess 38A is circular.
- the base 381 further comprises a slit 382 extending circumferentially along the side surface. The slit 382 penetrates the recess 38A.
- the base shaft portion 37A of the thread tension shaft 37 is inserted into the through hole 380. In this state, the rear end portion of the base shaft portion 37A slightly protrudes rearward from the rear end portion of the thread tensioning table 38. Further, the pair of split shaft portions 37B of the thread tension shaft 37 project forward from the front end portion of the thread tension base 38.
- the winding spring portion 36A of the thread take-up spring 36 wound around the base shaft portion 37A of the thread tension shaft 37 is arranged inside the recess 38A.
- the thread hooking portion 36B of the thread removing spring 36 projects outward from the inside of the recess 38A via the slit 382.
- the thread tension base 38 is fixed to the recess 241 provided on the front surface of the head 24 of the sewing machine 1A.
- the thread tensioning table 38 holds the thread tensioning device 3A on the head 24. With the thread tension table 38 fixed to the head 24, the thread tension plate 31, the rotating bodies 32A, 32B, the contact members 33A, 33B, the presser members 34A, 34B, and the cover 35 are from the front surface of the head 24. Protruding forward.
- the pressing shaft 39 has a columnar shape and is inserted into a through hole 370 provided in the base shaft portion 37A of the thread tension shaft 37.
- the pressing shaft 39 is supported so as to be movable in the axial direction with respect to the thread tension shaft 37.
- the front end portion of the pressing shaft 39 slightly protrudes forward with respect to the front end portion of the base shaft portion 37A and comes into contact with the rear end portion of the pressing member 34B.
- the rear end portion of the pressing shaft 39 slightly protrudes rearward with respect to the rear end portion of the base shaft portion 37A.
- the adjusting member 4A is arranged on the rear side with respect to the thread tensioning table 38.
- the adjusting member 4A has a solenoid 41 and a shaft 42.
- the solenoid 41 has a coil and a plunger inside the columnar frame 411. A portion of the front end of the plunger projects forward from the front end of the frame 411.
- the shaft 42 has a rod shape extending in the axial direction. The rear end portion of the shaft 42 contacts the portion of the plunger of the solenoid 41 that protrudes forward from the frame 411.
- the frame 411 of the solenoid 41 is attached to the rear end portion of the head 24 of the sewing machine 1A via the attachment 41A.
- the shaft 42 is arranged so as to be movable in the axial direction inside the through hole 240 that penetrates the head 24 in the axial direction. The front end of the shaft 42 comes into contact with the rear end of the pressing shaft 39 from behind.
- the adjusting member 4A drives the plunger in the axial direction according to the energization state of the solenoid 41 with respect to the coil, and moves the shaft 42 in the axial direction.
- the pressing shaft 39 also moves in accordance with the axial movement of the shaft 42, and the axial position of the pressing member 34B in contact with the front end portion of the pressing shaft 39 changes.
- the pressing force that the pressing members 34A and 34B press the contact members 33A and 33B from both sides in the axial direction changes.
- the greater the pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B the more the friction load applied from the contact members 33A and 33B when the thread tension pan 31 and the rotating bodies 32A and 32B rotate. Will also grow.
- the adjusting member 4A can adjust the amount of movement along the axial direction of the plunger according to the amount of energization to the coil. That is, the adjusting member 4A can adjust the position of the pressing member 34B that moves in the axial direction by the shaft 42 and the pressing shaft 39 by adjusting the moving amount of the plunger. In this case, the pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B is also adjusted. Therefore, the frictional load applied from the contact members 33A and 33B when the thread tension pan 31 and the rotating bodies 32A and 32B rotate is also adjusted.
- the worker places the sewing machine below the head 24 of the sewing machine 1A.
- the control unit of the sewing machine 1A controls the moving mechanism 25 and drives an air cylinder (not shown) provided on the support unit 250 to sandwich the sewn object between the upper feed plate and the lower feed plate 25B.
- the control unit of the sewing machine 1A moves the needle bar 24A of the head 24 in the vertical direction.
- the sewing needle provided on the needle bar 24A moves in the vertical direction together with the needle bar 24A.
- the balance mechanism 24C of the head 24 and the hook mechanism in the bed portion 21 operate in conjunction with the needle bar 24A.
- the sewing machine 1A sews an object to be sewn by a needle thread 9 inserted through a sewing needle and a bobbin thread housed in a hook mechanism.
- the needle thread 9 is unwound from the thread piece and moves toward the sewing needle while in contact with the auxiliary thread tensioner 26, the thread tensioning device 3A, the thread guides 27 and 28, and the balance mechanism 24C.
- the thread tension plate 31 of the thread tension device 3A moves in the clockwise direction (direction of arrow Y2) in a state of being viewed from the front in response to the movement of the wound needle thread 9 (arrow Y1). ..
- the rotating bodies 32A and 32B that come into contact with the thread tension plate 31 also rotate according to the rotation of the thread tension plate 31.
- the contact members 33A and 33B are pressed against the rotating bodies 32A and 32B by applying a pressing force corresponding to the level of tension input by the operator via the operation unit 29 from the pressing members 34A and 34B. ing. Therefore, a friction load in a direction for suppressing rotation is applied to the rotating bodies 32A and 32B from the contact members 33A and 33B. At the same time, a friction load in a direction for suppressing rotation is applied to the thread tension pan 31 in contact with the rotating bodies 32A and 32B from the rotating bodies 32A and 32B. Tension acts on the needle thread 9 in response to the suppression of the rotation of the thread tension plate 31.
- the pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B is adjusted by the adjusting member 4A according to the level of tension input by the operator via the operation unit 29. Therefore, the frictional load applied to the thread tension pan 31 from the contact members 33A and 33B via the rotating bodies 32A and 32B is also adjusted according to the level of tension input by the operator via the operation unit 29. .. As a result, the tension desired by the operator acts on the needle thread.
- the contact members 33A and 33B apply a frictional load to the rotation of the thread tension pan 31 via the rotating bodies 32A and 32B.
- the thread tension plate 31 and the rotating bodies 32A and 32B can rotate independently of each other.
- the amount of wear of the contact members 33A and 33B is suppressed as compared with the case where the contact members 33A and 33B are in direct contact with the thread tension pan 31 to apply a friction load.
- a large through hole 330 is formed in the center of the contact members 33A and 33B, the difference between the inner diameter and the outer diameter is small, and the rotation causes a large difference in the force applied to the surfaces of the contact members 33A and 33B. not.
- the contact members 33A and 33B are held by the rotating body 32A, so that the contact members 33A , 33B radial deviation can also be reduced. As a result, it is possible to reduce one-sided wear and damage of the contact members 33A and 33B.
- FIG. 8 is a graph comparing the tensions of the needle threads when sewing is performed using each of the sewing machine 1A according to the present embodiment and the conventional sewing machine.
- the horizontal axis indicates the sewing time.
- the vertical axis shows the tension of the needle thread. From the results shown in FIG. 8, the tension of the needle thread in the conventional sewing machine tends to increase immediately after the start of sewing, whereas the tension of the needle thread in the sewing machine 1A changes at a constant level even after the sewing time elapses. It turns out that there is a tendency to do. Therefore, it was found that by performing sewing using the sewing machine 1A equipped with the thread tensioning device 3A, it is possible to suppress an increase in the tension of the needle thread as compared with the conventional sewing machine.
- FIG. 9 is a graph showing the amount of wear of the contact members 33A and 33B when sewing is performed using the sewing machine 1A according to the present embodiment.
- the horizontal axis indicates the sewing time.
- the vertical axis shows the amount of change in the axial thickness of the contact members 33A and 33B as the amount of wear.
- the amount of change in the thickness of the contact members 33A and 33B was specified by measuring the total thickness of the thread tensioning device 3A in the axial direction (distance between the pressing members 34A and 34B). From the results of FIG.
- the wear amount of the contact members 33A and 33B in the sewing machine 1A is the limit of the wear amount (-0.9 mm) that can be sewn by the sewing machine 1A even if the sewing time has passed about 2000 hours. It turned out to be much lower. From this result, it was found that by sewing using the sewing machine 1A, the tension applied to the needle thread by the thread tensioning device 3A can be stably maintained even when the sewing time is about 2000 hours.
- FIG. 10 shows the result of comparing the stitches when the sewing machine 1A according to the present embodiment is sewn with the stitches when the sewing machine 1A is sewn by the conventional sewing machine. From the results shown in FIG. 10, it was confirmed that the thread was untwisted in the stitches of the conventional sewing machine, whereas the thread was not untwisted in the stitches of the sewing machine 1A. .. It is presumed that the untwisting of the stitches occurs when the needle thread 9 slips on the thread tension plate 31 during sewing. Therefore, from this result, it was found that the restraining portion T1 formed on the contact surface P of the thread tension plate 31 of the sewing machine 1A can effectively suppress the slip of the needle thread 9 with respect to the contact surface P of the thread tension plate 31. Therefore, it has been found that a stitch having a good finish can be formed by sewing using the sewing machine 1A equipped with the thread tensioning device 3A.
- the thread tensioning device 3A causes the rotating bodies 32A and 32B to be interposed between the thread tensioning plate 31 and the contact members 33A and 33B, so that the contact members 33A and 33B are worn according to the rotation of the thread tensioning plate 31. Can be suppressed. Therefore, the thread tensioning device 3A can suppress the frictional load applied to the thread tensioning dish 31 from fluctuating due to the wear of the contact members 33A and 33B, so that the tension of the needle thread 9 can be stably maintained.
- the thread tension plate 31 is provided with a restraining portion T1 for suppressing slippage of the needle thread 9 on a contact surface P that can come into contact with the needle thread 9 wound around the winding portion 31A. Therefore, the thread tensioning device 3A can prevent the needle thread 9 from slipping with respect to the winding portion 31A by the suppressing portion T1. Further, since the needle thread 9 does not slip, a desired tension can be stably applied to the needle thread 9. Therefore, the sewing machine 1A can form a stitch having a good finish on the sewn object. Further, the rotating bodies 32A and 32B include a bearing 30 interposed between the rotating bodies 32A and 32B and the thread tension shaft 37. Therefore, the thread tension device 3A can smoothly rotate the rotating bodies 32A and 32B with respect to the thread tension shaft 37.
- the contact member 33 Since the contact member 33 has a through hole 330, the difference between the outer diameter and the inner diameter of the contact member 33 becomes small. Therefore, it is possible to reduce the amount of difference for each position of the force acting on the surface of the contact member 33 when the thread tension plate 31 and the rotating body 32 are rotated. Further, the rotating body 32 can hold the contact member 33 from the inside of the through hole 330 by the second part 322 of the rotating body 32 in a state where the second part 322 is inserted into the through hole 330. Therefore, the thread tensioning device 3A can reduce one-sided wear and breakage of the contact member 33 due to use.
- the contact member 33 has a contact member 33A that comes into contact with the rotating body 32A and a contact member 33B that comes into contact with the rotating body 32B. Therefore, the contact member 33 can apply an appropriate frictional load to the thread tension plate 31 and the rotating body 32 from both sides in the axial direction, so that the tension applied to the needle thread 9 is in an appropriate state. , Easy to maintain.
- a recess 320A is provided on the rear surface of the rotating body 32A and on the front surface of the rotating body 32B.
- the bearing 30 is sandwiched from both sides in the axial direction by the recesses 320A of the rotating bodies 32A and 32B, respectively.
- the thread tensioning device 3A can prevent dust and the like from entering the bearing 30 by the simple structure of the rotating body 32.
- the adjusting member 4A has a solenoid 41.
- the adjusting member 4A adjusts the positions of the pressing members 34A and 34B in the axial direction by driving the shaft 42 via the plunger by the solenoid 41. As a result, the pressing force when the pressing members 34A and 34B press the contact members 33A and 33B is adjusted. As described above, the adjusting member 4A can easily adjust the magnitude of the frictional load applied to the thread tension pan 31 by the solenoid 41.
- the sewing machine 1B according to the second embodiment will be described.
- the sewing machine 1B differs from the first embodiment in that the thread tensioning device 3B (see FIG. 11) is used instead of the thread tensioning device 3A.
- the thread tensioning device 3B has an adjusting member 5A (see FIG. 11) instead of the adjusting member 4A. Since the other configurations of the sewing machine 1B except for the adjusting member 5A are the same as those of the sewing machine 1A, the description thereof will be omitted.
- the adjusting member 5A is arranged on the rear side with respect to the thread tensioning table 38.
- the adjusting member 5A has a pulse motor 51 and shafts 52 and 53.
- the pulse motor 51 is attached to the rear end of the head portion 24 of the sewing machine 1B via the attachment 51A.
- the pulse motor 51 can rotate the hollow rotor inside.
- a thread is formed on the inner surface of the inner air rotor.
- the shaft 52 is a ball screw, which is screwed into a thread on the inner surface of the hollow rotor.
- the shaft 52 moves in the front-rear direction due to the rotation of the inner air rotor.
- the front end of the shaft 52 projects forward from the pulse motor 51.
- the shaft 53 is arranged in a through hole 240 that penetrates the head 24 in the axial direction.
- the rear end of the shaft 53 comes into contact with the front end of the shaft 52 from the front.
- the front end of the shaft 53 comes into contact with the rear end of the pressing shaft 39 from behind.
- the control unit of the sewing machine 1B outputs a pulse signal to the pulse motor 51 of the adjusting member 5A.
- the pulse motor 51 rotates the inner air rotor in response to the input pulse signal, and moves the front end portion of the shaft 52 in the axial direction.
- the shaft 53 adjacent to the front end portion of the shaft 53 moves in the axial direction in the through hole 240, and the axial positions of the pressing shaft 39 and the pressing member 34B in contact with the front end portion change.
- the pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B changes.
- a frictional load is applied from the contact members 33A and 33B when the thread tension pan 31 and the rotating bodies 32A and 32B are rotated.
- the operator operates the push button of the operation unit 29 and inputs the level of tension applied to the needle thread 9 by the thread tension device 3B.
- the control unit of the sewing machine 1B outputs a pulse signal corresponding to the input tension level to the pulse motor 51 of the adjusting member 5A.
- the pulse motor 51 rotates the inner air rotor by the amount of rotation corresponding to the pulse signal and moves the shaft 52 in the axial direction.
- the shaft 53 moves in the axial direction in accordance with the movement of the shaft 52, and the pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B changes.
- a friction load in a direction for suppressing the rotation of the rotating bodies 32A and 32B and the thread tension pan 31 is applied from the contact members 33A and 33B.
- the magnitude of the frictional load applied to the rotating bodies 32A and 32B and the thread tension pan 31 from the contact members 33A and 33B is adjusted according to the level of tension input by the operator. Therefore, in response to the suppression of the rotation of the thread tension plate 31, the tension according to the level input by the operator acts on the needle thread 9. As described above, the adjusting member 5A can easily adjust the magnitude of the frictional load applied to the thread tension pan 31 by the pulse motor 51.
- the sewing machine 1C according to the third embodiment will be described.
- the sewing machine 1C differs from the first embodiment and the second embodiment in that the thread tensioning device 3C (see FIG. 12) is used instead of the thread tensioning devices 3A and 3B. Since the other configurations of the sewing machine 1C except for the thread tensioning device 3C are the same as those of the sewing machines 1A and 1B, the description thereof will be omitted.
- the thread tensioning device 3C differs from the thread tensioning devices 3A and 3B in that it has the adjusting member 6A instead of the adjusting members 4A and 5A.
- the shape of the thread tension plate 31, the rotating body 32A, 32B, the bearing 30, the contact members 33A, 33B, the presser members 34A, 34B, the thread take-up spring 36, and the thread tension base 38 included in the thread tension device 3C is the thread tension device 3A. It is the same as the thread tension plate 31, the rotating body 32A, 32B, the bearing 30, the contact members 33A, 33B, the presser members 34A, 34B, the thread take-up spring 36, and the thread tension base 38, which each of the 3Bs has.
- the thread tension shaft 67 has a base shaft portion 67A and a pair of split shaft portions 67B.
- the base shaft portion 67A has the same configuration as the base shaft portion 37A (see FIG. 4) in the thread tensioning devices 3A and 3B.
- the base shaft portion 67A includes a first base shaft portion 671 corresponding to the first base shaft portion 371 (see FIG. 4), a second base shaft portion 672 corresponding to the second base shaft portion 372 (see FIG. 4), and a through hole 370 (FIG. 4). It has a through hole 670 (see FIG. 13) corresponding to 3).
- the pressing shaft 39 is not inserted through the through hole 670. As shown in FIG.
- the rear end portion of the base shaft portion 67A slightly protrudes rearward from the rear end portion of the thread tensioning table 38 and is held in the through hole 240 of the head 24.
- the thread tension plate 31, the rotating bodies 32A and 32B, the contact members 33A and 33B, the pressing members 34A and 34B, and the adjusting member 6A described later project forward from the front surface of the head 24.
- the pair of split shaft portions 67B is longer in the axial direction than the pair of split shaft portions 37B (see FIG. 4) in the thread tensioning devices 3A and 3B.
- the pair of split shaft portions 67B penetrates the through holes 310 of the thread tension pan 31, the through holes 320 of the rotating bodies 32A and 32B, and the pair of through holes 340 of the pressing members 34A and 34B in the axial direction.
- the portion including the tip of the pair of split shaft portions 67B projects forward with respect to the pressing member 34A.
- a screw thread 68 is formed in a portion of the curved portion of the pair of split shaft portions 67B that protrudes forward from the pressing member 34A.
- the adjusting member 6A is on the front side with respect to the pressing member 34A, in other words, on the side where the contact member 33A (see FIGS. 13 and 14) is arranged in the axial direction with respect to the pressing member 34A. Placed on the other side.
- the adjusting member 6A has a knob 61, a compression spring 62, and a saucer 63.
- the knob 61 has a columnar shape and extends in the axial direction.
- the peripheral side surface of the knob 61 is formed with irregularities that function as anti-slip when gripped by an operator.
- the knob 61 is further provided with a through hole 610 extending in the axial direction.
- a thread is formed on the inner surface of the through hole 610.
- a pair of split shaft portions 67B of the thread tension shaft 67 is inserted through the through hole 610.
- the thread formed on the inner surface of the through hole 610 and the thread 68 of the pair of split shaft portions 67B are screwed together.
- the axial position of the knob 61 changes as the knob 61 rotates with respect to the pair of split shaft portions 67B.
- the compression spring 62 is arranged between the knob 61 and the pressing member 34A in the axial direction.
- the compression spring 62 is a conical spring whose diameter increases toward the rear.
- a saucer 63 is interposed between the compression spring 62 and the pressing member 34A.
- the saucer 63 has a substantially circular plate shape and is orthogonal to the axial direction.
- the elastic force of the compression spring 62 acts on the pressing member 34A via the saucer 63.
- the pressing member 34A moves backward and presses the contact member 33A against the rotating body 32A.
- the saucer 63 is provided with a pair of through holes 630.
- a pair of split shaft portions 67B are arranged in the center of the compression spring 62 and in the pair of through holes 630 of the saucer 63.
- the distance between the knob 61 and the saucer 63 changes, and the degree of compression of the compression spring 62 also changes.
- the force with which the compression spring 62 presses the pressing member 34A rearward due to the elastic force also changes.
- the pressing force that the pressing members 34A and 34B press the contact members 33A and 33B from both sides in the axial direction changes. That is, the adjusting member 6A can adjust the pressing force by which the pressing members 34A and 34B press the contact members 33A and 33B in response to the rotation of the knob 61 to adjust the position in the axial direction. In this case, the frictional load applied from the contact members 33A and 33B when the thread tension pan 31 and the rotating bodies 32A and 32B rotate is also adjusted.
- the operator performs an operation of rotating the knob 61 to adjust the position of the knob 61 in the axial direction.
- the magnitude of the elastic force acting on the pressing member 34A from the compression spring 62 via the saucer 63 changes, so that the pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B also changes.
- a friction load in a direction for suppressing the rotation of the rotating bodies 32A and 32B and the thread tension pan 31 is applied from the contact members 33A and 33B.
- the magnitude of the frictional load applied to the rotating bodies 32A and 32B and the thread tension pan 31 from the contact members 33A and 33B is adjusted according to the amount of rotation and the direction of rotation when the operator rotates the knob 61. To. Therefore, in response to the suppression of the rotation of the thread tension plate 31, the rotation amount of the knob 61 adjusted by the operator and the tension according to the rotation direction act on the needle thread 9. As described above, the adjusting member 6A can easily adjust the magnitude of the frictional load applied to the thread tension pan 31 by adjusting the axial position of the knob 61.
- an intermediate may be interposed between the thread tension plate 31 and the rotating bodies 32A and 32B.
- the rotating bodies 32A and 32B do not have to be in contact with each other because they are adjacent to the thread tension pan 31.
- the thread tensioning device 3A may have only one of the rotating bodies 32A and 32B.
- the contact member 33B may directly contact the thread tension plate 31 from the rear side.
- the contact member 33A may directly contact the thread tension plate 31 from the front side.
- the thread tension plate 31 and the rotating bodies 32A and 32B may be adhered with an adhesive or the like.
- the rotating bodies 32A and 32B and the bearing may be adhered with an adhesive or the like.
- the restraining unit T1 can be appropriately changed to another configuration capable of suppressing the slip of the needle thread.
- the restraining portion T2 may have a plurality of grooves that are orthogonal to the radial direction of the center of the base portion 311 and extend linearly.
- the restraining portion T3 may have a plurality of grooves extending linearly along the radial direction.
- a plurality of arc-shaped grooves of concentric circles are used, but instead of concentric circles, a groove having a plurality of arcs having the same curvature or curves having the same shape may be arranged, or the grooves may be cut in a grid pattern. It may be.
- the suppression portion is not limited to the one formed by grooving by laser processing, the one in which unevenness is formed by pressability, the one in which the surface of the contact surface P is roughened by blasting, a coating agent, thermal spraying, etc. A different material may be partially applied to the surface of the contact surface P.
- the bearing 30 may be provided on the thread tension plate 31 instead of the rotating bodies 32A and 32B.
- the adjusting member may adjust the axial position of the pressing member 34B by moving the pressing shaft 39 in the axial direction by a linear motor.
- the thread tensioning device 3A can be applied to sewing machines other than the portal type sewing machine exemplified in the sewing machine 1A.
- the thread tensioning device 3A may be applied to a well-known sewing machine having a bed portion, a pedestal portion, and an arm portion (for example, a household sewing machine).
- the front side is an example of "one side in the axial direction”.
- the rear side is an example of "the other side in the axial direction”.
- the rotating body 32A is an example of the first rotating body.
- the rotating body 32B is an example of the second rotating body.
- the contact member 33A is an example of the first contact member.
- the contact member 33B is an example of the second contact member.
- the recess 320A of the rotating body 32A is an example of the first recess.
- the recess 320A of the rotating body 32B is an example of the second recess.
- Sewing machines 1A, 1B and 1C are examples of sewing machines.
- 1A, 1B, 1C Sewing machine 3A, 3B, 3C: Thread tensioning device 4A, 5A, 6A: Adjusting member 30: Bearing 31: Thread tensioning plate 31A: Winding part 32, 32A, 32B: Rotating body 33, 33A, 33B : Contact member 34, 34A, 34B: Presser member 37, 67: Thread tension shaft 41: Solenoid 51: Pulse motor 61: Knob 62: Compression spring S1: Inner contact part S2: Outer contact part T1, T2, T3: Suppression Department
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- Engineering & Computer Science (AREA)
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- Sewing Machines And Sewing (AREA)
Abstract
Provided are: a rotating thread tension device that can stably maintain the tensile strength of a sewing thread; and a sewing device comprising said thread tension device. This thread tension device 3A is characterized by comprising: a thread tension disk 31 that rotates by means of the movement of a sewing thread wound around a winding part; a thread tension shaft 37 that extends in the axial direction through the center of rotation of the thread tension disk 31; a rotating body 32 that is rotatably supported by the thread tension shaft 37, is adjacent to one side and the other side of the thread tension disk 31 in the axial direction, and rotates in accordance with the rotation of the thread tension disk 31; a contacting member 33 that comes into contact with an outside contact part S2 which is a section of the rotating body 32 reverse in the axial direction of an inside contact part S1 being a section coming into contact with the thread tension disk 31; a pressing member 34 that presses the contacting member 33 against the rotating body 32 and applies a frictional load to the rotation of the rotating body 32 and the thread tension disk 31; and an adjustment member 4A that adjusts the pressing force at which the pressing member 34 presses the contacting member 33.
Description
本開示は、糸調子装置、及び縫製装置に関する。
This disclosure relates to a thread tensioning device and a sewing device.
特許文献1は、回転式糸調子装置を開示する。回転式糸調子装置は、回転糸調子皿及び当接部材を有する。回転糸調子皿には縫糸が巻き付けられる。回転糸調子皿は、縫糸の繰り出しに応じて回転する。当接部材は、回転糸調子皿の両面に接触する。回転式糸調子装置は、当接部材に対して回転糸調子皿が回転する時に作用する摺動摩擦力により、縫糸に張力を付与する。
Patent Document 1 discloses a rotary yarn tensioning device. The rotary yarn tensioning device has a rotary yarn tensioning dish and a contact member. Sewing thread is wound around the rotating thread tension plate. The rotary thread tension plate rotates according to the feeding of the sewing thread. The abutting member contacts both sides of the rotary thread tension pan. The rotary thread tensioning device applies tension to the sewing thread by the sliding friction force acting on the abutting member when the rotating thread tensioning dish rotates.
回転式糸調子装置において、当接部材に対して回転糸調子皿が回転することに応じ、当接部材が摩耗する場合がある。この場合、回転式糸調子装置は、縫糸の張力を安定的に維持できないという問題点がある。
In the rotary thread tensioning device, the contact member may wear as the rotary thread tension pan rotates with respect to the contact member. In this case, the rotary thread tensioning device has a problem that the tension of the sewing thread cannot be stably maintained.
本開示の目的は、縫糸の張力を安定的に維持できる回転式の糸調子装置、及び、糸調子装置を備えた縫製装置を提供することである。
An object of the present disclosure is to provide a rotary thread tensioning device capable of stably maintaining the tension of the sewing thread, and a sewing device provided with the thread tensioning device.
本開示の第一態様に係る糸調子装置は、縫糸を巻付ける巻付部を有し、前記巻付部に巻き付けられた前記縫糸の移動により回転可能な糸調子皿と、前記糸調子皿の回転中心を通って軸方向に延びる糸調子軸と、前記糸調子軸に対して回転可能に支持され、且つ、前記糸調子皿に対して前記軸方向の一方側及び他方側の少なくとも一方に隣接し、前記糸調子皿の回転に応じて回転する回転体と、前記回転体のうち、前記糸調子皿との接触部分である内側接触部に対して前記軸方向の反対側の部分である外側接触部に接触する当接部材と、前記当接部材を前記回転体に押し付け、前記回転体及び前記糸調子皿の回転時に摩擦負荷を与える押え部材と、前記押え部材を前記当接部材に押し付ける押圧力を調整する調整部材とを備えたことを特徴とする。
The thread tensioning device according to the first aspect of the present disclosure has a winding portion around which sewing thread is wound, and has a thread tensioning plate that can be rotated by the movement of the sewing thread wound around the winding portion, and a thread tensioning plate. A thread tension shaft extending axially through the center of rotation, rotatably supported with respect to the thread tension shaft, and adjacent to at least one side and the other side of the shaft direction with respect to the thread tension pan. Then, the rotating body that rotates according to the rotation of the thread tension plate and the outer side of the rotating body that is the portion opposite to the inner contact portion that is the contact portion with the thread tension plate in the axial direction. The abutting member that comes into contact with the contact portion, the pressing member that presses the abutting member against the rotating body, and applies a frictional load when the rotating body and the thread tension pan are rotated, and the pressing member is pressed against the abutting member. It is characterized by being provided with an adjusting member for adjusting the pressing force.
糸調子装置は、糸調子皿と当接部材との間に回転体を介在させることによって、糸調子皿の回転に応じた当接部材の摩耗を抑制できる。従って糸調子装置は、糸調子皿に与える摩擦負荷の変動を抑制できるので、縫糸の張力を安定的に維持できる。
The thread tensioning device can suppress wear of the contact member in response to the rotation of the thread tensioning plate by interposing a rotating body between the thread tensioning plate and the contact member. Therefore, the thread tensioning device can suppress fluctuations in the frictional load applied to the thread tensioning dish, so that the tension of the sewing thread can be stably maintained.
第一態様において、前記糸調子皿は、前記巻付部に巻き付けられた前記縫糸に接触可能な接触面に、前記縫糸の滑りを抑制する抑制部を備えてもよい。糸調子装置は、巻付部に対して縫糸が滑ることを、抑制部により抑制できる。
In the first aspect, the thread tension plate may be provided with a restraining portion for suppressing slippage of the sewing thread on a contact surface that is wound around the winding portion and is in contact with the sewing thread. The thread tensioning device can prevent the sewing thread from slipping with respect to the winding portion by the restraining portion.
第一態様において、前記回転体は、前記軸方向に隣接する第一部と第二部を有し、前記第一部の外径は前記第二部の外径より大きく、前記当接部材は、貫通孔を有し、前記貫通孔に前記回転体の前記第二部が挿通されてもよい。この場合、当接部材の外径と内径との差異を小さくでき、且つ、回転体によって当接部材を貫通孔の内側から保持できるため、当接部材の片摩耗や破損を低減できる。
In the first aspect, the rotating body has a first part and a second part adjacent to each other in the axial direction, the outer diameter of the first part is larger than the outer diameter of the second part, and the contact member is , The second portion of the rotating body may be inserted through the through hole. In this case, the difference between the outer diameter and the inner diameter of the contact member can be reduced, and the contact member can be held from the inside of the through hole by the rotating body, so that one-sided wear or breakage of the contact member can be reduced.
第一態様において、前記回転体は、前記糸調子皿の前記軸方向の一方に設けられる第一回転体と、前記軸方向の他方に設けられる第二回転体とを含み、前記当接部材は、前記第一回転体に当接する第一当接部材と、前記第二回転体に当接する第二当接部材とを含んでいてもよい。この場合、糸調子皿及び回転体に対し、軸方向の両側から適切な摩擦負荷を与えることができるので、縫糸に対して付与された張力が適切な状態を容易に維持できる。
In the first aspect, the rotating body includes a first rotating body provided on one of the axial directions of the thread tension pan and a second rotating body provided on the other side of the axial direction, and the contact member is a contact member. , The first contact member that comes into contact with the first rotating body and the second contact member that comes into contact with the second rotating body may be included. In this case, since an appropriate friction load can be applied to the thread tension pan and the rotating body from both sides in the axial direction, the tension applied to the sewing thread can be easily maintained in an appropriate state.
第一態様において、前記回転体は、前記糸調子軸との間に介在するベアリングを備えてもよい。糸調子装置は、糸調子軸に対して回転体をスムーズに回転させることができる。
In the first aspect, the rotating body may include a bearing interposed between the rotating body and the thread tension shaft. The thread tensioning device can smoothly rotate the rotating body with respect to the thread tensioning shaft.
第一態様において、前記第一回転体には、前記他方を向く面に第一凹部が設けられ、前記第二回転体には、前記一方を向く面に第二凹部が設けられ、前記回転体と前記糸調子軸との間に介在するベアリングを更に備え、前記ベアリングは、前記第一凹部と前記第二凹部によって挟持されてもよい。この場合、ベアリングへのごみ等の侵入を、簡易な構造により防止できる。
In the first aspect, the first rotating body is provided with a first recess on the surface facing the other, and the second rotating body is provided with a second recess on the surface facing the other. A bearing interposed between the thread tension shaft and the thread tension shaft is further provided, and the bearing may be sandwiched between the first recess and the second recess. In this case, the intrusion of dust or the like into the bearing can be prevented by a simple structure.
第一態様において、前記調整部材は、ソレノイドを少なくとも含み、前記ソレノイドの駆動に応じて前記押え部材の前記軸方向における位置を調整することにより、前記押圧力を調整してもよい。調整部材は、糸調子皿及び回転体に与える摩擦負荷の大きさを、ソレノイドにより容易に調整できる。
In the first aspect, the adjusting member may include at least a solenoid, and the pressing force may be adjusted by adjusting the position of the pressing member in the axial direction according to the driving of the solenoid. The adjusting member can easily adjust the magnitude of the frictional load applied to the thread tension pan and the rotating body by the solenoid.
第一態様において、前記調整部材は、前記押え部材に対し、前記軸方向において前記当接部材が配置される側と反対側に配置され、前記軸方向における位置の調整が可能なつまみと、前記つまみ及び前記押え部材の間に介在する圧縮ばねとを少なくとも有し、前記押え部材は、前記圧縮ばねの弾性力が作用することにより、前記当接部材を前記回転体に押し付け、前記調整部材は、前記つまみの前記軸方向における位置を調整することにより、前記押圧力を調節してもよい。調整部材は、糸調子皿及び回転体に与える摩擦負荷の大きさを、つまみの位置を調整することにより容易に調整できる。
In the first aspect, the adjusting member is arranged on the side opposite to the side where the contact member is arranged in the axial direction with respect to the holding member, and the knob capable of adjusting the position in the axial direction and the said. The pressing member has at least a compression spring interposed between the knob and the pressing member, and the pressing member presses the contact member against the rotating body by the elastic force of the compression spring, and the adjusting member , The pressing force may be adjusted by adjusting the position of the knob in the axial direction. The adjusting member can easily adjust the magnitude of the frictional load applied to the thread tension pan and the rotating body by adjusting the position of the knob.
第一態様において、前記調整部材は、パルスモータを少なくとも含み、前記パルスモータの駆動に応じて前記押え部材の前記軸方向における位置を調整することにより、前記押圧力を調整してもよい。調整部材は、糸調子皿及び回転体に与える摩擦負荷の大きさを、パルスモータにより容易に調整できる。
In the first aspect, the adjusting member may include at least a pulse motor, and the pressing force may be adjusted by adjusting the position of the pressing member in the axial direction according to the driving of the pulse motor. The adjusting member can easily adjust the magnitude of the frictional load applied to the thread tension pan and the rotating body by a pulse motor.
本開示の第二態様に係る縫製装置は、第一態様に係る糸調子装置と、上下方向に延び、縫針を下端に装着可能であり、上下動可能な針棒と、を備えたことを特徴とする。第二態様によれば、第一態様と同様の効果を奏することができる。
The sewing device according to the second aspect of the present disclosure is characterized by including a thread tensioning device according to the first aspect, and a needle bar that extends in the vertical direction, has a sewing needle that can be attached to the lower end, and can move up and down. And. According to the second aspect, the same effect as that of the first aspect can be obtained.
<第一実施形態>
本開示の第一実施形態に係る糸調子装置3Aを備えたミシン1Aについて、図面を参照して説明する。以下説明では、図中に矢印で示す左右、前後、上下を使用する。 <First Embodiment>
Thesewing machine 1A provided with the thread tensioning device 3A according to the first embodiment of the present disclosure will be described with reference to the drawings. In the following description, left and right, front and back, and up and down indicated by arrows in the figure are used.
本開示の第一実施形態に係る糸調子装置3Aを備えたミシン1Aについて、図面を参照して説明する。以下説明では、図中に矢印で示す左右、前後、上下を使用する。 <First Embodiment>
The
<ミシン1Aの概要>
ミシン1Aは、被縫製物に対する縫製が可能な門型のミシンである。図1に示すように、ミシン1Aは、ベッド部21、一対の脚柱部22、梁部23、頭部24、移動機構25を有する。ベッド部21は、基部21A及び枠体21Bを有する。基部21Aは略矩形状である。基部21Aの上面は、水平に延びる平らな保持面21Uを形成する。基部21Aの前端部に、保持面21Uに沿って前方に延びる保持板21Pが設けてある。保持面21Uの右端部近傍に、前後方向に延びる蛇腹21Rが設けてある。保持面21Uの左端部近傍に、前後方向に延びる蛇腹21Lが設けてある。蛇腹21R、21Lは夫々、保持面21Uの前端部と後端部の間に亘って後述の一対の前後移動機構251の前後両側を直線状に延びる。蛇腹21R、21Lは、一対の前後移動機構251が前後方向に往復移動することに応じ、伸縮する。枠体21Bは格子状の構造体であり、基部21Aを下方から支持する。 <Overview ofsewing machine 1A>
Thesewing machine 1A is a gantry sewing machine capable of sewing on an object to be sewn. As shown in FIG. 1, the sewing machine 1A has a bed portion 21, a pair of pedestal portions 22, a beam portion 23, a head portion 24, and a moving mechanism 25. The bed portion 21 has a base portion 21A and a frame body 21B. The base 21A has a substantially rectangular shape. The upper surface of the base 21A forms a horizontally extending flat holding surface 21U. A holding plate 21P extending forward along the holding surface 21U is provided at the front end of the base 21A. A bellows 21R extending in the front-rear direction is provided near the right end of the holding surface 21U. A bellows 21L extending in the front-rear direction is provided near the left end of the holding surface 21U. The bellows 21R and 21L extend linearly on both front and rear sides of the pair of front-rear movement mechanisms 251 described later, respectively, between the front end portion and the rear end portion of the holding surface 21U. The bellows 21R and 21L expand and contract as the pair of front-back movement mechanisms 251 reciprocate in the front-back direction. The frame body 21B is a grid-like structure and supports the base portion 21A from below.
ミシン1Aは、被縫製物に対する縫製が可能な門型のミシンである。図1に示すように、ミシン1Aは、ベッド部21、一対の脚柱部22、梁部23、頭部24、移動機構25を有する。ベッド部21は、基部21A及び枠体21Bを有する。基部21Aは略矩形状である。基部21Aの上面は、水平に延びる平らな保持面21Uを形成する。基部21Aの前端部に、保持面21Uに沿って前方に延びる保持板21Pが設けてある。保持面21Uの右端部近傍に、前後方向に延びる蛇腹21Rが設けてある。保持面21Uの左端部近傍に、前後方向に延びる蛇腹21Lが設けてある。蛇腹21R、21Lは夫々、保持面21Uの前端部と後端部の間に亘って後述の一対の前後移動機構251の前後両側を直線状に延びる。蛇腹21R、21Lは、一対の前後移動機構251が前後方向に往復移動することに応じ、伸縮する。枠体21Bは格子状の構造体であり、基部21Aを下方から支持する。 <Overview of
The
一対の脚柱部22は、脚柱部22R、22Lを有する。脚柱部22R、22Lは夫々、略四角柱状である。脚柱部22Rは、ベッド部21の基部21Aの右端部且つ前後方向中央よりも前方の位置から、上方に延びる。脚柱部22Rは、左右方向において蛇腹21Rよりも右側に位置する。脚柱部22Lは、ベッド部21の基部21Aの左端部且つ前後方向中央よりも前方の位置から、上方に延びる。脚柱部22Lは、左右方向において蛇腹21Lよりも左側に位置する。脚柱部22R、22Lは、左右方向に離隔する。
The pair of pedestal portions 22 has pedestal portions 22R and 22L. The pedestal portions 22R and 22L are substantially square pillars, respectively. The pedestal portion 22R extends upward from a position at the right end of the base portion 21A of the bed portion 21 and in front of the center in the front-rear direction. The pedestal portion 22R is located on the right side of the bellows 21R in the left-right direction. The pedestal portion 22L extends upward from the left end portion of the base portion 21A of the bed portion 21 and a position in front of the center in the front-rear direction. The pedestal portion 22L is located on the left side of the bellows 21L in the left-right direction. The pedestal portions 22R and 22L are separated in the left-right direction.
梁部23は、脚柱部22R、22Lの夫々の間に架設する。梁部23は、一対の脚柱部22の間に亘って左右方向に延びる。梁部23は、筐体23Uを有する。筐体23Uは、脚柱部22R、22Lの夫々の上端部と後端部の間に亘って延びる。脚柱部22R、22L、筐体23Uで囲まれた空間に、レール220が設けてある。レール220は棒状を有し、脚柱部22R、22Lの間に架設する。レール220は、後述の頭部24を左右方向に移動可能に支持する。蛇腹23Fは、脚柱部22R、22L、筐体23Uの夫々の前端部、及び、後述の頭部24の左右両端部に亘って設けてある。蛇腹23Fは、頭部24を支持するレール220を前側から覆う。蛇腹23Fは、頭部24がレール220に沿って左右方向に往復移動することに応じ、伸縮する。
The beam portion 23 is erected between the pedestal portions 22R and 22L, respectively. The beam portion 23 extends in the left-right direction between the pair of pedestal portions 22. The beam portion 23 has a housing 23U. The housing 23U extends between the upper end portions and the rear end portions of the pedestal portions 22R and 22L, respectively. The rail 220 is provided in the space surrounded by the pedestal portions 22R and 22L and the housing 23U. The rail 220 has a rod shape and is erected between the pedestal portions 22R and 22L. The rail 220 supports the head 24, which will be described later, so as to be movable in the left-right direction. The bellows 23F is provided over the front ends of the pedestal portions 22R and 22L, the housing 23U, and the left and right ends of the head 24 described later. The bellows 23F covers the rail 220 supporting the head 24 from the front side. The bellows 23F expands and contracts as the head 24 reciprocates in the left-right direction along the rail 220.
頭部24は、梁部23に対して前側に設けてある。頭部24は、針棒24A、押え足24B、天秤機構24C、糸調子装置3A、副糸調子器26、糸案内27、28(図2参照)等を備える。針棒24Aは上下方向に延び、下端部に非図示の縫針を装着可能である。針棒24Aは上下方向に移動可能である。押え足24Bは、針棒24Aの移動に応じて縫針が通過する貫通穴を有し、被縫製物を上側から押える。図2に示すように、天秤機構24Cは、針棒24Aの上下方向への移動に応じて動作し、上糸9を引き上げる。糸調子装置3Aは、上糸9の張力を調整する。糸調子装置3Aの詳細は後述する。副糸調子器26は、頭部24の前面且つ糸調子装置3Aの上方に設けてある。副糸調子器26は、非図示の糸駒から延びる上糸9に巻き付き、下方の糸調子装置3Aに向けて上糸9を誘導する。糸案内27は、頭部24の前面且つ糸調子装置3Aの左方に設けてある。糸案内28は、頭部24の前面且つ糸調子装置3Aの上方に設けてある。糸案内27、28は夫々、糸調子装置3Aから延びる上糸9に接触し、天秤機構24Cに向けて誘導する。梁部23内のレール220は、頭部24を左右方向に移動可能に支持する。従って頭部24は、梁部23の前端部に沿って左右方向に移動可能である。頭部24の下方且つ基部21Aの内部に、非図示の釜機構が設けてある。釜機構は、針棒24Aの下方への移動時に縫針が通過する針穴を設けた針板を有する。釜機構は頭部24と同期して左右方向に移動可能である。
The head 24 is provided on the front side with respect to the beam portion 23. The head portion 24 includes a needle bar 24A, a presser foot 24B, a balance mechanism 24C, a thread tensioning device 3A, an auxiliary thread tensioning device 26, thread guides 27, 28 (see FIG. 2) and the like. The needle bar 24A extends in the vertical direction, and a sewing needle (not shown) can be attached to the lower end portion. The needle bar 24A is movable in the vertical direction. The presser foot 24B has a through hole through which the sewing needle passes according to the movement of the needle bar 24A, and presses the object to be sewn from above. As shown in FIG. 2, the balance mechanism 24C operates in response to the vertical movement of the needle bar 24A and pulls up the needle thread 9. The thread tensioning device 3A adjusts the tension of the needle thread 9. Details of the thread tensioning device 3A will be described later. The auxiliary thread tensioner 26 is provided on the front surface of the head 24 and above the thread tensioning device 3A. The auxiliary thread tensioner 26 winds around the needle thread 9 extending from a thread piece (not shown) and guides the needle thread 9 toward the lower thread tensioner 3A. The thread guide 27 is provided on the front surface of the head 24 and on the left side of the thread tensioning device 3A. The thread guide 28 is provided on the front surface of the head 24 and above the thread tension device 3A. The thread guides 27 and 28 each come into contact with the needle thread 9 extending from the thread tensioning device 3A and guide them toward the balance mechanism 24C. The rail 220 in the beam portion 23 supports the head portion 24 so as to be movable in the left-right direction. Therefore, the head 24 can move in the left-right direction along the front end portion of the beam portion 23. A kettle mechanism (not shown) is provided below the head 24 and inside the base 21A. The hook mechanism has a needle plate provided with a needle hole through which the sewing needle passes when the needle rod 24A is moved downward. The hook mechanism can move in the left-right direction in synchronization with the head 24.
図1に示すように、移動機構25は、ベッド部21の保持面21Uの上方に設けてある。移動機構25は、ベッド部21に載置した被縫製物を前後方向に移動する。移動機構25は、支持部250、下送り板25B、一対の前後移動機構251を有する。支持部250は、ベッド部21の保持面21Uに設けた蛇腹21R、21Lの間を左右方向に延びる。一対の前後移動機構251は、支持部250の左右両端部に設けてある。一対の前後移動機構251は、支持部250の右端部に設けた前後移動機構251R、及び、支持部250の左端部に設けた前後移動機構251Lを有する。前後移動機構251Rは、蛇腹21Rの下方に設けた非図示のベルトと連結する。前後移動機構251Lは、蛇腹21Lの下方に設けた非図示のベルトと連結する。一対の前後移動機構251は、前後移動機構251R、251Lに連結するベルトを同期回転することに応じ、支持部250を前後方向に移動する。支持部250は、一対の前後移動機構251の内側において下送り板25Bと連結する。下送り板25Bは、支持部250の下方近傍から前側に向けて、保持面21Uと平行に延びる。支持部250は更に、左右方向中央に非図示のエアシリンダを有する。エアシリンダは、非図示の上送り板を上下方向に移動可能である。上送り板は下方に移動した状態で、下送り板25Bとの間に被縫製物を挟持できる。
As shown in FIG. 1, the moving mechanism 25 is provided above the holding surface 21U of the bed portion 21. The moving mechanism 25 moves the sewn object placed on the bed portion 21 in the front-rear direction. The moving mechanism 25 has a support portion 250, a lower feed plate 25B, and a pair of front-back moving mechanisms 251. The support portion 250 extends in the left-right direction between the bellows 21R and 21L provided on the holding surface 21U of the bed portion 21. A pair of front-back moving mechanisms 251 are provided at both left and right ends of the support portion 250. The pair of front-back moving mechanisms 251 have a front-back moving mechanism 251R provided at the right end portion of the support portion 250 and a front-back moving mechanism 251L provided at the left end portion of the support portion 250. The front-back movement mechanism 251R is connected to a belt (not shown) provided below the bellows 21R. The front-back movement mechanism 251L is connected to a belt (not shown) provided below the bellows 21L. The pair of front-rear movement mechanisms 251 move the support portion 250 in the front-rear direction in response to the synchronous rotation of the belts connected to the front- rear movement mechanisms 251R and 251L. The support portion 250 is connected to the lower feed plate 25B inside the pair of front-back movement mechanisms 251. The lower feed plate 25B extends from the lower vicinity of the support portion 250 toward the front side in parallel with the holding surface 21U. The support portion 250 further has an air cylinder (not shown) in the center in the left-right direction. The air cylinder can move up and down on the upper feed plate (not shown). The upper feed plate can hold the sewn object between the upper feed plate and the lower feed plate 25B in a state of being moved downward.
基部21Aの前端部に操作部29が設けてある。操作部29は、表示部及び押ボタンを含む。操作部29は、表示部を介してミシン1Aの状態等を表示し、押ボタンを介して作業者による入力操作を受け付ける。枠体21Bの内部に、非図示の制御基板を含む制御部が設けてある。制御部は、ミシン1Aによる縫製動作全般を制御する。例えば制御部は、操作部29を介して受け付けた入力操作を検出し、後述の調整部材4Aを制御する。
An operation unit 29 is provided at the front end of the base 21A. The operation unit 29 includes a display unit and a push button. The operation unit 29 displays the status of the sewing machine 1A or the like via the display unit, and accepts an input operation by the operator via a push button. A control unit including a control board (not shown) is provided inside the frame 21B. The control unit controls the entire sewing operation of the sewing machine 1A. For example, the control unit detects an input operation received via the operation unit 29 and controls the adjustment member 4A described later.
<糸調子装置3A>
図3に示すように、糸調子装置3Aは、糸調子皿31、回転体32A、32B(総称して回転体32という。)、当接部材33A、33B(総称して当接部材33という。)、押え部材34A、34B(総称して押え部材34という。)、カバー35、糸取りばね36、糸調子軸37、糸調子台38、押圧軸39、及び調整部材4Aを有する。なお、以下において、前後方向を軸方向ともいう。 <Thread tension device 3A>
As shown in FIG. 3, thethread tensioning device 3A includes a thread tensioning dish 31, rotating bodies 32A and 32B (collectively referred to as rotating bodies 32), and contact members 33A and 33B (collectively referred to as contact members 33). ), Pressing members 34A and 34B (collectively referred to as pressing members 34), a cover 35, a thread take-up spring 36, a thread tension shaft 37, a thread tension base 38, a pressing shaft 39, and an adjusting member 4A. In the following, the front-back direction is also referred to as an axial direction.
図3に示すように、糸調子装置3Aは、糸調子皿31、回転体32A、32B(総称して回転体32という。)、当接部材33A、33B(総称して当接部材33という。)、押え部材34A、34B(総称して押え部材34という。)、カバー35、糸取りばね36、糸調子軸37、糸調子台38、押圧軸39、及び調整部材4Aを有する。なお、以下において、前後方向を軸方向ともいう。 <
As shown in FIG. 3, the
<糸調子皿31>
図4に示すように、糸調子皿31は、基部311及び巻付部31Aを有する。基部311は、円形の略板状を有し、軸方向と直交する。以下、基部311の平面に沿って中心から放射方向に延びる方向を、半径方向という。基部311の中心に、円形の貫通孔310が設けられる。巻付部31Aは、基部311の周端部から外側に向けて延びる。巻付部31Aは、互いに交差する方向に延びる複数の第一リブQ1及び複数の第二リブQ2により構成される。図5(A)に示すように、複数の第一リブQ1は、夫々、半径方向に対して前向きに傾斜する。複数の第二リブQ2は、夫々、半径方向に対して後向きに傾斜する。各々の第一リブQ1及び第二リブQ2は、基部311の周端部に沿って交互に配列される。複数の第一リブQ1と複数の第二リブQ2とは、基部311の近傍で交差する。複数の第一リブQ1と複数の第二リブQ2との軸方向の間隔は、基部311から離隔する程大きくなる。糸調子皿31の材料として、金属が用いられる。 <Thread tension plate 31>
As shown in FIG. 4, thethread tension plate 31 has a base portion 311 and a winding portion 31A. The base 311 has a circular substantially plate shape and is orthogonal to the axial direction. Hereinafter, the direction extending in the radial direction from the center along the plane of the base 311 is referred to as a radial direction. A circular through hole 310 is provided in the center of the base 311. The winding portion 31A extends outward from the peripheral end portion of the base portion 311. The winding portion 31A is composed of a plurality of first ribs Q1 and a plurality of second ribs Q2 extending in directions intersecting each other. As shown in FIG. 5A, each of the plurality of first ribs Q1 is inclined forward with respect to the radial direction. Each of the plurality of second ribs Q2 is inclined backward with respect to the radial direction. The first rib Q1 and the second rib Q2 are arranged alternately along the peripheral end of the base 311. The plurality of first ribs Q1 and the plurality of second ribs Q2 intersect in the vicinity of the base 311. The axial distance between the plurality of first ribs Q1 and the plurality of second ribs Q2 increases as the distance from the base 311 increases. Metal is used as the material of the thread tension plate 31.
図4に示すように、糸調子皿31は、基部311及び巻付部31Aを有する。基部311は、円形の略板状を有し、軸方向と直交する。以下、基部311の平面に沿って中心から放射方向に延びる方向を、半径方向という。基部311の中心に、円形の貫通孔310が設けられる。巻付部31Aは、基部311の周端部から外側に向けて延びる。巻付部31Aは、互いに交差する方向に延びる複数の第一リブQ1及び複数の第二リブQ2により構成される。図5(A)に示すように、複数の第一リブQ1は、夫々、半径方向に対して前向きに傾斜する。複数の第二リブQ2は、夫々、半径方向に対して後向きに傾斜する。各々の第一リブQ1及び第二リブQ2は、基部311の周端部に沿って交互に配列される。複数の第一リブQ1と複数の第二リブQ2とは、基部311の近傍で交差する。複数の第一リブQ1と複数の第二リブQ2との軸方向の間隔は、基部311から離隔する程大きくなる。糸調子皿31の材料として、金属が用いられる。 <
As shown in FIG. 4, the
巻付部31Aには、複数の第一リブQ1の後側の面と、複数の第二リブQ2の前側の面(以下、接触面Pという。)に上糸9(図2参照)が接触した状態で巻き付けられる。この時、上糸9は、複数の第一リブQ1及び複数の第二リブQ2によってジグザグに延びた状態となる。図5(B)に示すように、接触面Pには、上糸9の滑りを抑制する抑制部T1が設けられる。抑制部T1は、互いに平行に延びる複数の溝である。各溝は、基部311の中心を基準として同心円状に延びる。複数の溝の半径方向の間隔は均一である。複数の溝の各々の間のピッチは、10μm以上100μm以下の何れかの値に設定される。本実施形態において、ピッチは0.1mmである。複数の溝は、レーザ照射により接触面Pに形成される。各溝は、基部311の中心を基準として同心円状に延びる。
The needle thread 9 (see FIG. 2) is in contact with the winding portion 31A on the rear surface of the plurality of first ribs Q1 and the front surface of the plurality of second ribs Q2 (hereinafter referred to as contact surface P). It is wrapped in the state that it is. At this time, the needle thread 9 is in a state of being extended in a zigzag manner by the plurality of first ribs Q1 and the plurality of second ribs Q2. As shown in FIG. 5B, the contact surface P is provided with a restraining portion T1 for suppressing the slip of the needle thread 9. The restraining portion T1 is a plurality of grooves extending in parallel with each other. Each groove extends concentrically with respect to the center of the base 311. The radial spacing of the grooves is uniform. The pitch between each of the plurality of grooves is set to any value of 10 μm or more and 100 μm or less. In this embodiment, the pitch is 0.1 mm. The plurality of grooves are formed on the contact surface P by laser irradiation. Each groove extends concentrically with respect to the center of the base 311.
図5(C)に示すように、接触面Pには熱処理等による表面硬化処理が施される。なお、レーザ照射により形成された複数の溝の各々は、表面硬化処理により形成された硬化層に形成され、硬化層を破っていない。図5(D)に示すように、レーザ照射により形成された複数の溝には、外径が数μmのドロスが複数形成される。
As shown in FIG. 5C, the contact surface P is subjected to surface hardening treatment by heat treatment or the like. It should be noted that each of the plurality of grooves formed by the laser irradiation is formed in the hardened layer formed by the surface hardening treatment and does not break the hardened layer. As shown in FIG. 5D, a plurality of dross having an outer diameter of several μm are formed in the plurality of grooves formed by laser irradiation.
<糸調子軸37>
図4に示すように、糸調子軸37は略円柱状を有し、軸方向に沿って延びる。糸調子軸37は、基軸部37A及び一対の分割軸部37Bを有する。 <Thread tension shaft 37>
As shown in FIG. 4, thethread tension shaft 37 has a substantially columnar shape and extends along the axial direction. The thread tension shaft 37 has a base shaft portion 37A and a pair of split shaft portions 37B.
図4に示すように、糸調子軸37は略円柱状を有し、軸方向に沿って延びる。糸調子軸37は、基軸部37A及び一対の分割軸部37Bを有する。 <
As shown in FIG. 4, the
基軸部37Aは円柱状を有し、軸方向に沿って延びる。基軸部37Aは、径の異なる第一基軸部371及び第二基軸部372を有する。第一基軸部371の径は、第二基軸部372の径よりも僅かに大きい。第一基軸部371は、第二基軸部372に対して前側に隣接する。図3に示すように、基軸部37Aの中心に貫通孔370が設けられる。貫通孔370の断面形状は円形であり、基軸部37Aを軸方向に貫通する。貫通孔370には、後述する押圧軸39が挿通される。
The base shaft portion 37A has a columnar shape and extends along the axial direction. The base shaft portion 37A has a first base shaft portion 371 and a second base shaft portion 372 having different diameters. The diameter of the first shaft portion 371 is slightly larger than the diameter of the second base shaft portion 372. The first shaft portion 371 is adjacent to the second base shaft portion 372 on the front side. As shown in FIG. 3, a through hole 370 is provided in the center of the base shaft portion 37A. The cross-sectional shape of the through hole 370 is circular, and penetrates the base shaft portion 37A in the axial direction. A pressing shaft 39, which will be described later, is inserted through the through hole 370.
図4に示すように、一対の分割軸部37Bは、基軸部37Aの前端部のうち貫通孔370の開口が形成されていない部分から、前方に向けて延びる。各々の分割軸部37Bを軸方向と直交する平面で切断した場合の断面形状は、弓形である。一対の分割軸部37Bの各々の平面部は、軸方向と直交する方向に対向する。一対の分割軸部37Bの各々の湾曲部を通る仮想的な円筒部の中心及び径を、各々、一対の分割軸部37Bの中心及び径という。一対の分割軸部37Bの径は、糸調子皿31の貫通孔310の径よりも小さい。一対の分割軸部37Bは、糸調子皿31の貫通孔310を軸方向に貫通し、糸調子皿31を回転可能に支持する。基軸部37A及び一対の分割軸部37Bの夫々の中心は、糸調子皿31の回転中心を通る。
As shown in FIG. 4, the pair of split shaft portions 37B extend forward from the portion of the front end portion of the base shaft portion 37A where the opening of the through hole 370 is not formed. The cross-sectional shape when each split shaft portion 37B is cut in a plane orthogonal to the axial direction is a bow shape. Each plane portion of the pair of split shaft portions 37B faces in a direction orthogonal to the axial direction. The center and diameter of the virtual cylindrical portion passing through each curved portion of the pair of split shaft portions 37B are referred to as the center and diameter of the pair of split shaft portions 37B, respectively. The diameter of the pair of split shaft portions 37B is smaller than the diameter of the through hole 310 of the thread tension pan 31. The pair of split shaft portions 37B penetrate through the through hole 310 of the thread tension plate 31 in the axial direction and rotatably support the thread tension plate 31. The centers of the base shaft portion 37A and the pair of split shaft portions 37B each pass through the rotation center of the thread tension pan 31.
<回転体32>
図3、図4に示すように、回転体32Aは、糸調子皿31に対して前側に隣接し、回転体32Bは、糸調子皿31に対して後側に隣接する。回転体32A、32Bの形状は略同一である。以下、回転体32Aを例に挙げて詳細を説明し、回転体32Bの詳細な説明は省略する。 <Rotating body 32>
As shown in FIGS. 3 and 4, therotating body 32A is adjacent to the thread tension plate 31 on the front side, and the rotating body 32B is adjacent to the thread tension plate 31 on the rear side. The shapes of the rotating bodies 32A and 32B are substantially the same. Hereinafter, the details will be described by taking the rotating body 32A as an example, and the detailed description of the rotating body 32B will be omitted.
図3、図4に示すように、回転体32Aは、糸調子皿31に対して前側に隣接し、回転体32Bは、糸調子皿31に対して後側に隣接する。回転体32A、32Bの形状は略同一である。以下、回転体32Aを例に挙げて詳細を説明し、回転体32Bの詳細な説明は省略する。 <
As shown in FIGS. 3 and 4, the
図4に示すように、回転体32Aは、第一部321及び第二部322を有する。第一部321及び第二部322は、夫々、所定の厚みを有する円形の板状であり、軸方向と直交する。第一部321及び第二部322は軸方向に隣接する。第一部321の外径は、第二部322の外径よりも大きい。尚、回転体32Aの材料は特に限定されないが、一例として、樹脂(POM、フッ素樹脂等)や金属(ステンレスや熱処理した鋼、糸調子皿31と同じ材料等)が用いられる。
As shown in FIG. 4, the rotating body 32A has a first part 321 and a second part 322. The first part 321 and the second part 322 are each in the shape of a circular plate having a predetermined thickness and are orthogonal to the axial direction. The first part 321 and the second part 322 are adjacent to each other in the axial direction. The outer diameter of the first part 321 is larger than the outer diameter of the second part 322. The material of the rotating body 32A is not particularly limited, but as an example, a resin (POM, fluororesin, etc.) or a metal (stainless steel, heat-treated steel, the same material as the thread tension pan 31, etc.) is used.
回転体32Aの中心に、断面形状が円形の貫通孔320が設けられる。貫通孔320は、第一部321の前端部と第二部322の後端部との間に亘って、回転体32Aを軸方向に貫通する。図3に示すように、第一部321のうち軸方向において第二部322と隣接する側と反対側の面を、内側接触部S1という。内側接触部S1のうち貫通孔320の開口の周囲に、第二部322側に向けて凹んだ凹部320Aが設けられる。凹部320Aの断面形状は円形であり、貫通孔320の径よりも大きな径を有する。第一部321のうち軸方向において内側接触部S1と反対側に対向する面を、外側接触部S2という。
A through hole 320 having a circular cross-sectional shape is provided at the center of the rotating body 32A. The through hole 320 axially penetrates the rotating body 32A between the front end portion of the first portion 321 and the rear end portion of the second portion 322. As shown in FIG. 3, the surface of the first part 321 on the side opposite to the side adjacent to the second part 322 in the axial direction is referred to as an inner contact part S1. A recess 320A recessed toward the second portion 322 side is provided around the opening of the through hole 320 in the inner contact portion S1. The cross-sectional shape of the recess 320A is circular and has a diameter larger than the diameter of the through hole 320. The surface of the first part 321 facing the inner contact portion S1 in the axial direction is referred to as an outer contact portion S2.
回転体32A、32Bは、夫々の内側接触部S1を糸調子皿31側に向けた状態で配置される。回転体32A、32Bの夫々の内側接触部S1は、軸方向の両側から、糸調子皿31の基部311に接触する。これにより、回転体32A、32Bは糸調子皿31を軸方向の両側から挟持する。回転体32A、32Bは、夫々の凹部320Aにて囲まれた領域内にベアリング30を保持する。ベアリング30は、回転体32A、32Bと、回転体32A、32Bの夫々の貫通孔320を貫通する糸調子軸37との間に介在する。このため回転体32A、32Bは、ベアリング30を介して糸調子軸37に回転可能に支持され、糸調子皿31の回転に追従して回転可能となる。
The rotating bodies 32A and 32B are arranged with their inner contact portions S1 facing the thread tension plate 31 side. The inner contact portions S1 of the rotating bodies 32A and 32B each come into contact with the base portion 311 of the thread tension pan 31 from both sides in the axial direction. As a result, the rotating bodies 32A and 32B sandwich the thread tension plate 31 from both sides in the axial direction. The rotating bodies 32A and 32B hold the bearing 30 in the region surrounded by the respective recesses 320A. The bearing 30 is interposed between the rotating bodies 32A and 32B and the thread tension shaft 37 penetrating the through holes 320 of the rotating bodies 32A and 32B, respectively. Therefore, the rotating bodies 32A and 32B are rotatably supported by the thread tension shaft 37 via the bearing 30, and can rotate following the rotation of the thread tension plate 31.
<当接部材33>
当接部材33A、33Bは、円形の略板状を有し、軸方向と直交する。当接部材33A、33Bの夫々の中心に、糸調子軸37の径より十分大きい円形の貫通孔330が設けられる。図3に示すように、当接部材33Aの貫通孔330に、回転体32Aの第二部322が挿通される。当接部材33Aは、回転体32Aの第一部321に対して前側に隣接し、回転体32Aの外側接触部S2に接触する。当接部材33Bの貫通孔330に、回転体32Bの第二部322が挿通される。当接部材33Bは、回転体32Bの第一部321に対して後側に隣接し、回転体32Bの外側接触部S2に接触する。当接部材33の材料は特に限定されないが、一例として、カーボン、セラミック、樹脂(例えば、POM、フッ素樹脂、ポリアミド、ポリイミド、ポリアミドイミド、ポリアセタール、含油樹脂等)、繊維素材(例えば、フッ素繊維、ガラス繊維、鋼繊維、炭素繊維等)の織布もしくは不織布(フェルト)が用いられる。また、求める摩擦力や耐久性、取り扱い性の向上等の用途に応じてこれらの単体及び複合体の形で用いられてもよい。 <Abutment member 33>
The abutting members 33A and 33B have a circular substantially plate shape and are orthogonal to the axial direction. A circular through hole 330 sufficiently larger than the diameter of the thread tension shaft 37 is provided at the center of each of the contact members 33A and 33B. As shown in FIG. 3, the second portion 322 of the rotating body 32A is inserted into the through hole 330 of the contact member 33A. The contact member 33A is adjacent to the front side of the first part 321 of the rotating body 32A and comes into contact with the outer contact portion S2 of the rotating body 32A. The second portion 322 of the rotating body 32B is inserted into the through hole 330 of the abutting member 33B. The contact member 33B is adjacent to the rear side of the first part 321 of the rotating body 32B and comes into contact with the outer contact portion S2 of the rotating body 32B. The material of the abutting member 33 is not particularly limited, but as an example, carbon, ceramic, resin (for example, POM, fluororesin, polyamide, polyimide, polyamideimide, polyacetal, oil-impregnated resin, etc.), fiber material (for example, fluorofiber, etc.) Woven or non-woven fabric (felt) of glass fiber, steel fiber, carbon fiber, etc. is used. Further, they may be used in the form of a single substance or a composite thereof depending on the required frictional force, durability, and improvement in handleability.
当接部材33A、33Bは、円形の略板状を有し、軸方向と直交する。当接部材33A、33Bの夫々の中心に、糸調子軸37の径より十分大きい円形の貫通孔330が設けられる。図3に示すように、当接部材33Aの貫通孔330に、回転体32Aの第二部322が挿通される。当接部材33Aは、回転体32Aの第一部321に対して前側に隣接し、回転体32Aの外側接触部S2に接触する。当接部材33Bの貫通孔330に、回転体32Bの第二部322が挿通される。当接部材33Bは、回転体32Bの第一部321に対して後側に隣接し、回転体32Bの外側接触部S2に接触する。当接部材33の材料は特に限定されないが、一例として、カーボン、セラミック、樹脂(例えば、POM、フッ素樹脂、ポリアミド、ポリイミド、ポリアミドイミド、ポリアセタール、含油樹脂等)、繊維素材(例えば、フッ素繊維、ガラス繊維、鋼繊維、炭素繊維等)の織布もしくは不織布(フェルト)が用いられる。また、求める摩擦力や耐久性、取り扱い性の向上等の用途に応じてこれらの単体及び複合体の形で用いられてもよい。 <
The abutting
<押え部材34>
図3、図4に示すように、押え部材34Aは当接部材33Aに対して前側に隣接し、押え部材34Bは当接部材33Bに対して後側に隣接する。押え部材34A、34Bの形状は同一である。以下、押え部材34Bを例に挙げて詳細を説明し、押え部材34Aの詳細な説明は省略する。 <Presser member 34>
As shown in FIGS. 3 and 4, the pressingmember 34A is adjacent to the abutting member 33A on the front side, and the pressing member 34B is adjacent to the abutting member 33B on the rear side. The shapes of the pressing members 34A and 34B are the same. Hereinafter, the details will be described by taking the presser member 34B as an example, and the detailed description of the presser member 34A will be omitted.
図3、図4に示すように、押え部材34Aは当接部材33Aに対して前側に隣接し、押え部材34Bは当接部材33Bに対して後側に隣接する。押え部材34A、34Bの形状は同一である。以下、押え部材34Bを例に挙げて詳細を説明し、押え部材34Aの詳細な説明は省略する。 <
As shown in FIGS. 3 and 4, the pressing
図4に示すように、押え部材34Bは基部341を有する。基部341は、所定の厚みを有する円形の板状を有し、軸方向と直交する。基部341のうち当接部材33Bと隣接する側の面に、凹部342が設けられる。凹部342の断面形状は円形である。基部341のうち当接部材33Bと隣接する側の面を、内側接触部S3という。凹部342の径は、回転体32Bの第二部322の径よりも僅かに大きい。凹部342の底部に、一対の貫通孔340が設けられる。一対の貫通孔340の夫々の断面形状は、糸調子軸37の一対の分割軸部37Bの夫々の断面形状と同一である。
As shown in FIG. 4, the pressing member 34B has a base portion 341. The base portion 341 has a circular plate shape having a predetermined thickness and is orthogonal to the axial direction. A recess 342 is provided on the surface of the base portion 341 on the side adjacent to the contact member 33B. The cross-sectional shape of the recess 342 is circular. The surface of the base portion 341 on the side adjacent to the contact member 33B is referred to as an inner contact portion S3. The diameter of the recess 342 is slightly larger than the diameter of the second portion 322 of the rotating body 32B. A pair of through holes 340 are provided at the bottom of the recess 342. The cross-sectional shape of each of the pair of through holes 340 is the same as the cross-sectional shape of each of the pair of split shaft portions 37B of the thread tension shaft 37.
図3に示すように、押え部材34Aは、内側接触部S3を当接部材33A側に向けた状態で配置される。押え部材34Aの内側接触部S3は、当接部材33Aに接触する。押え部材34Aは、当接部材33Aを回転体32Aの第一部321に押し付ける。押え部材34Aの凹部342の内側の領域に、回転体32Aの第二部322が配置される。同様に、押え部材34Bは、内側接触部S3を当接部材33Bに向けた状態で配置される。押え部材34Bの内側接触部S3は、当接部材33Bに接触する。押え部材34Bの凹部342の内側の領域に、回転体32Bの第二部322が配置される。押え部材34Bは、当接部材33Bを回転体32Bの第一部321に押し付ける。
As shown in FIG. 3, the pressing member 34A is arranged with the inner contact portion S3 facing the contact member 33A side. The inner contact portion S3 of the presser member 34A comes into contact with the contact member 33A. The pressing member 34A presses the contact member 33A against the first part 321 of the rotating body 32A. The second portion 322 of the rotating body 32A is arranged in the region inside the recess 342 of the pressing member 34A. Similarly, the pressing member 34B is arranged with the inner contact portion S3 facing the contact member 33B. The inner contact portion S3 of the presser member 34B comes into contact with the contact member 33B. The second portion 322 of the rotating body 32B is arranged in the region inside the recess 342 of the pressing member 34B. The pressing member 34B presses the contact member 33B against the first part 321 of the rotating body 32B.
押え部材34A、34Bの一対の貫通孔340の夫々には、糸調子軸37の一対の分割軸部37Bの夫々が軸方向に貫通する。一対の分割軸部37Bの前端は、押え部材34Aの一対の貫通孔340から前側に突出する。押え部材34A、34Bは、糸調子軸37に保持される。押え部材34A、34Bの回転は、糸調子軸37により抑制される。なお前述のように、糸調子皿31及び回転体32A、32Bは糸調子軸37に対して回転可能である。このため、押え部材34A、34Bは、当接部材33A、33Bを回転体32A、32Bに押し付けることにより、糸調子皿31及び回転体32A、32Bの回転に摩擦負荷を付与できる。
A pair of split shaft portions 37B of the thread tension shaft 37 penetrate each of the pair of through holes 340 of the presser members 34A and 34B in the axial direction. The front ends of the pair of split shaft portions 37B project forward from the pair of through holes 340 of the pressing member 34A. The pressing members 34A and 34B are held by the thread tension shaft 37. The rotation of the presser members 34A and 34B is suppressed by the thread tension shaft 37. As described above, the thread tension dish 31 and the rotating bodies 32A and 32B are rotatable with respect to the thread tension shaft 37. Therefore, the pressing members 34A and 34B can apply a friction load to the rotation of the thread tension pan 31 and the rotating bodies 32A and 32B by pressing the contact members 33A and 33B against the rotating bodies 32A and 32B.
<カバー35>
図4に示すように、カバー35は、所謂セットカラーであり、押え部材34Aに対して前側に隣接する。カバー35は、円柱状の基部351を有する。基部351は軸方向に沿って延びる。基部351の中心には、軸方向に延びる貫通孔350が設けられる。基部351は、側面に沿って軸方向に延びるスリット352を備える。スリット352は貫通孔350に貫通する。基部351は更に、スリット352の間隔を調整するための螺子35Bを備える。スリット352の間隔及び貫通孔350の径は、螺子35Bの螺合の程度に応じて調整可能である。 <Cover 35>
As shown in FIG. 4, thecover 35 is a so-called set collar, and is adjacent to the pressing member 34A on the front side. The cover 35 has a columnar base 351. The base 351 extends along the axial direction. A through hole 350 extending in the axial direction is provided at the center of the base portion 351. The base 351 includes a slit 352 extending axially along the side surface. The slit 352 penetrates through the through hole 350. The base 351 further comprises a screw 35B for adjusting the spacing of the slits 352. The distance between the slits 352 and the diameter of the through hole 350 can be adjusted according to the degree of screwing of the screw 35B.
図4に示すように、カバー35は、所謂セットカラーであり、押え部材34Aに対して前側に隣接する。カバー35は、円柱状の基部351を有する。基部351は軸方向に沿って延びる。基部351の中心には、軸方向に延びる貫通孔350が設けられる。基部351は、側面に沿って軸方向に延びるスリット352を備える。スリット352は貫通孔350に貫通する。基部351は更に、スリット352の間隔を調整するための螺子35Bを備える。スリット352の間隔及び貫通孔350の径は、螺子35Bの螺合の程度に応じて調整可能である。 <
As shown in FIG. 4, the
図3に示すように、貫通孔350には、糸調子軸37の一対の分割軸部37Bのうち押え部材34Aから前側に突出した部分が配置される。軸止35Aは、貫通孔350の内部に配置された一対の分割軸部37Bの先端に前側から係合する。この状態で、螺子35Bにより貫通孔350の径が縮められることで、糸調子皿31、回転体32A、32B、及び押え部材34A、34Bからの糸調子軸37の脱離が抑制される。
As shown in FIG. 3, in the through hole 350, a portion of the pair of split shaft portions 37B of the thread tension shaft 37 that protrudes forward from the presser member 34A is arranged. The shaft stop 35A engages with the tip of the pair of split shaft portions 37B arranged inside the through hole 350 from the front side. In this state, the diameter of the through hole 350 is reduced by the screw 35B, so that the thread tension pan 31, the rotating bodies 32A, 32B, and the presser members 34A, 34B are prevented from being detached from the thread tension shaft 37.
<糸取りばね36、糸調子台38>
図4に示すように、糸取りばね36は、巻きばね部36A及び糸掛け部36Bを有する。巻きばね部36Aはねじりばねであり、内腔は軸方向に沿って延びる。巻きばね部36Aは、糸調子軸37の基軸部37Aの第一基軸部371に巻回する(図3参照)。糸掛け部36Bは、巻きばね部36Aの素線の一端部から延びる。糸掛け部36Bは、上糸9(図2参照)を掛けることが可能なように屈曲する。 <Thread take-upspring 36, thread tension stand 38>
As shown in FIG. 4, the thread take-upspring 36 has a coil spring portion 36A and a thread hook portion 36B. The coil spring portion 36A is a torsion spring, and the lumen extends along the axial direction. The coil spring portion 36A is wound around the first base shaft portion 371 of the base shaft portion 37A of the thread tension shaft 37 (see FIG. 3). The thread hook portion 36B extends from one end of the wire of the coil spring portion 36A. The thread hooking portion 36B is bent so that the needle thread 9 (see FIG. 2) can be hooked.
図4に示すように、糸取りばね36は、巻きばね部36A及び糸掛け部36Bを有する。巻きばね部36Aはねじりばねであり、内腔は軸方向に沿って延びる。巻きばね部36Aは、糸調子軸37の基軸部37Aの第一基軸部371に巻回する(図3参照)。糸掛け部36Bは、巻きばね部36Aの素線の一端部から延びる。糸掛け部36Bは、上糸9(図2参照)を掛けることが可能なように屈曲する。 <Thread take-up
As shown in FIG. 4, the thread take-up
糸調子台38は、円柱状の基部381を有する。基部381は軸方向に沿って延びる。図3に示すように、基部381は、押え部材34Bに対して後側に隣接する。基部381の中心には、軸方向に延びる貫通孔380が設けられる。基部381の前面のうち、貫通孔380の開口の周囲に、凹部38Aが設けられる(図4参照)。凹部38Aの断面形状は円形である。基部381は更に、側面に沿って周回方向に延びるスリット382を備える。スリット382は、凹部38Aに貫通する。
The thread tensioning table 38 has a columnar base 381. The base 381 extends along the axial direction. As shown in FIG. 3, the base portion 381 is adjacent to the pressing member 34B on the rear side. At the center of the base portion 381, a through hole 380 extending in the axial direction is provided. A recess 38A is provided around the opening of the through hole 380 in the front surface of the base portion 381 (see FIG. 4). The cross-sectional shape of the recess 38A is circular. The base 381 further comprises a slit 382 extending circumferentially along the side surface. The slit 382 penetrates the recess 38A.
貫通孔380には、糸調子軸37の基軸部37Aが挿通する。この状態で、基軸部37Aの後端部は、糸調子台38の後端部よりも後方に僅かに突出する。又、糸調子軸37の一対の分割軸部37Bは、糸調子台38の前端部から前側に突出する。糸調子軸37の基軸部37Aに巻回された糸取りばね36の巻きばね部36Aは、凹部38Aの内部に配置される。糸取りばね36の糸掛け部36Bは、スリット382を介して凹部38Aの内部から外側に突出する。
The base shaft portion 37A of the thread tension shaft 37 is inserted into the through hole 380. In this state, the rear end portion of the base shaft portion 37A slightly protrudes rearward from the rear end portion of the thread tensioning table 38. Further, the pair of split shaft portions 37B of the thread tension shaft 37 project forward from the front end portion of the thread tension base 38. The winding spring portion 36A of the thread take-up spring 36 wound around the base shaft portion 37A of the thread tension shaft 37 is arranged inside the recess 38A. The thread hooking portion 36B of the thread removing spring 36 projects outward from the inside of the recess 38A via the slit 382.
糸調子台38は、ミシン1Aの頭部24の前面に設けられた凹部241に固定される。糸調子台38は、糸調子装置3Aを頭部24に保持する。糸調子台38が頭部24に固定された状態で、糸調子皿31、回転体32A、32B、当接部材33A、33B、押え部材34A、34B、及びカバー35は、頭部24の前面から前方に突出する。
The thread tension base 38 is fixed to the recess 241 provided on the front surface of the head 24 of the sewing machine 1A. The thread tensioning table 38 holds the thread tensioning device 3A on the head 24. With the thread tension table 38 fixed to the head 24, the thread tension plate 31, the rotating bodies 32A, 32B, the contact members 33A, 33B, the presser members 34A, 34B, and the cover 35 are from the front surface of the head 24. Protruding forward.
<押圧軸39>
図3に示すように、押圧軸39は円柱状を有し、糸調子軸37の基軸部37Aに設けられた貫通孔370に挿通する。押圧軸39は、糸調子軸37に対して軸方向に移動可能に支持される。押圧軸39の前端部は、基軸部37Aの前端部に対して前方に僅かに突出し、押え部材34Bの後端部に接触する。押圧軸39の後端部は、基軸部37Aの後端部に対して後方に僅かに突出する。 <Pressingaxis 39>
As shown in FIG. 3, the pressingshaft 39 has a columnar shape and is inserted into a through hole 370 provided in the base shaft portion 37A of the thread tension shaft 37. The pressing shaft 39 is supported so as to be movable in the axial direction with respect to the thread tension shaft 37. The front end portion of the pressing shaft 39 slightly protrudes forward with respect to the front end portion of the base shaft portion 37A and comes into contact with the rear end portion of the pressing member 34B. The rear end portion of the pressing shaft 39 slightly protrudes rearward with respect to the rear end portion of the base shaft portion 37A.
図3に示すように、押圧軸39は円柱状を有し、糸調子軸37の基軸部37Aに設けられた貫通孔370に挿通する。押圧軸39は、糸調子軸37に対して軸方向に移動可能に支持される。押圧軸39の前端部は、基軸部37Aの前端部に対して前方に僅かに突出し、押え部材34Bの後端部に接触する。押圧軸39の後端部は、基軸部37Aの後端部に対して後方に僅かに突出する。 <Pressing
As shown in FIG. 3, the pressing
<調整部材4A>
図3~図7に示すように、調整部材4Aは、糸調子台38に対して後側に配置される。図6、図7に示すように、調整部材4Aは、ソレノイド41及び軸42を有する。ソレノイド41は、円柱状のフレーム411の内部にコイル及びプランジャを有する。プランジャの前端部の一部は、フレーム411の前端部から前方に突出する。軸42は軸線方向に延びる棒状を有する。軸42の後端部は、ソレノイド41のプランジャのうちフレーム411から前方に突出した部分に接触する。 <Adjustingmember 4A>
As shown in FIGS. 3 to 7, the adjustingmember 4A is arranged on the rear side with respect to the thread tensioning table 38. As shown in FIGS. 6 and 7, the adjusting member 4A has a solenoid 41 and a shaft 42. The solenoid 41 has a coil and a plunger inside the columnar frame 411. A portion of the front end of the plunger projects forward from the front end of the frame 411. The shaft 42 has a rod shape extending in the axial direction. The rear end portion of the shaft 42 contacts the portion of the plunger of the solenoid 41 that protrudes forward from the frame 411.
図3~図7に示すように、調整部材4Aは、糸調子台38に対して後側に配置される。図6、図7に示すように、調整部材4Aは、ソレノイド41及び軸42を有する。ソレノイド41は、円柱状のフレーム411の内部にコイル及びプランジャを有する。プランジャの前端部の一部は、フレーム411の前端部から前方に突出する。軸42は軸線方向に延びる棒状を有する。軸42の後端部は、ソレノイド41のプランジャのうちフレーム411から前方に突出した部分に接触する。 <Adjusting
As shown in FIGS. 3 to 7, the adjusting
図3に示すように、ソレノイド41のフレーム411は、取付具41Aを介してミシン1Aの頭部24の後端部に取り付けられる。軸42は、頭部24を軸方向に貫通する貫通孔240の内部に、軸方向に移動可能に配置される。軸42の前端部は、押圧軸39の後端部に後方から接触する。
As shown in FIG. 3, the frame 411 of the solenoid 41 is attached to the rear end portion of the head 24 of the sewing machine 1A via the attachment 41A. The shaft 42 is arranged so as to be movable in the axial direction inside the through hole 240 that penetrates the head 24 in the axial direction. The front end of the shaft 42 comes into contact with the rear end of the pressing shaft 39 from behind.
調整部材4Aは、ソレノイド41のコイルに対する通電状態に応じてプランジャを軸方向に駆動し、軸42を軸方向に移動させる。軸42の軸方向の移動に応じて押圧軸39も移動し、押圧軸39の前端部に接触した押え部材34Bの軸方向の位置は変化する。この時、押え部材34A、34Bが当接部材33A、33Bを軸方向の両側から押圧する押圧力が変化する。なお、押え部材34A、34Bが当接部材33A、33Bを押圧する押圧力が大きい程、糸調子皿31及び回転体32A、32Bが回転するときに当接部材33A、33Bから付与される摩擦負荷も大きくなる。
The adjusting member 4A drives the plunger in the axial direction according to the energization state of the solenoid 41 with respect to the coil, and moves the shaft 42 in the axial direction. The pressing shaft 39 also moves in accordance with the axial movement of the shaft 42, and the axial position of the pressing member 34B in contact with the front end portion of the pressing shaft 39 changes. At this time, the pressing force that the pressing members 34A and 34B press the contact members 33A and 33B from both sides in the axial direction changes. The greater the pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B, the more the friction load applied from the contact members 33A and 33B when the thread tension pan 31 and the rotating bodies 32A and 32B rotate. Will also grow.
ここで調整部材4Aは、プランジャの軸方向に沿った移動量を、コイルに対する通電量に応じて調整できる。つまり調整部材4Aは、軸42及び押圧軸39により軸方向に移動する押え部材34Bの位置を、プランジャの移動量を調整することにより調整できる。この場合、押え部材34A、34Bが当接部材33A、33Bを押圧する押圧力も調整される。従って、糸調子皿31及び回転体32A、32Bが回転する時に当接部材33A、33Bから付与される摩擦負荷も調整される。
Here, the adjusting member 4A can adjust the amount of movement along the axial direction of the plunger according to the amount of energization to the coil. That is, the adjusting member 4A can adjust the position of the pressing member 34B that moves in the axial direction by the shaft 42 and the pressing shaft 39 by adjusting the moving amount of the plunger. In this case, the pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B is also adjusted. Therefore, the frictional load applied from the contact members 33A and 33B when the thread tension pan 31 and the rotating bodies 32A and 32B rotate is also adjusted.
<ミシン1Aの動作概要>
作業者は、操作部29の押ボタンを操作し、糸調子装置3Aにより上糸9に付与する張力のレベルを入力する。ミシン1Aの制御部は、入力された張力のレベルに応じた電流を、調整部材4Aのソレノイド41のコイルに通電する。これにより、調整部材4Aのプランジャ及び軸42は、電流に応じた移動量分、軸方向に移動する。軸42の軸方向の移動に応じ、押圧軸39及び押え部材34Bも移動し、押え部材34Bの軸方向の位置は変化する。これにより、押え部材34A、34Bが当接部材33A、33Bを押圧する押圧力が変化する。 <Outline of operation ofsewing machine 1A>
The operator operates the push button of theoperation unit 29 and inputs the level of tension applied to the needle thread 9 by the thread tension device 3A. The control unit of the sewing machine 1A energizes the coil of the solenoid 41 of the adjusting member 4A with a current corresponding to the input tension level. As a result, the plunger and the shaft 42 of the adjusting member 4A move in the axial direction by the amount of movement according to the current. The pressing shaft 39 and the pressing member 34B also move according to the axial movement of the shaft 42, and the axial position of the pressing member 34B changes. As a result, the pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B changes.
作業者は、操作部29の押ボタンを操作し、糸調子装置3Aにより上糸9に付与する張力のレベルを入力する。ミシン1Aの制御部は、入力された張力のレベルに応じた電流を、調整部材4Aのソレノイド41のコイルに通電する。これにより、調整部材4Aのプランジャ及び軸42は、電流に応じた移動量分、軸方向に移動する。軸42の軸方向の移動に応じ、押圧軸39及び押え部材34Bも移動し、押え部材34Bの軸方向の位置は変化する。これにより、押え部材34A、34Bが当接部材33A、33Bを押圧する押圧力が変化する。 <Outline of operation of
The operator operates the push button of the
作業者は、ミシン1Aの頭部24の下方に被縫製物を配置する。ミシン1Aの制御部は、移動機構25を制御し、支持部250に設けられた非図示のエアシリンダを駆動して上送り板と下送り板25Bとの間に被縫製物を挟む。作業者が操作部29を介して縫製の開始指示を入力した場合、ミシン1Aの制御部は、頭部24の針棒24Aを上下方向に移動ささせる。針棒24Aに設けた縫針は、針棒24Aと共に上下方向に移動する。頭部24の天秤機構24C、及び、ベッド部21内の釜機構は、針棒24Aに連動して動作する。ミシン1Aは、縫針に挿通した上糸9、及び、釜機構に収容した下糸により、被縫製物を縫製する。
The worker places the sewing machine below the head 24 of the sewing machine 1A. The control unit of the sewing machine 1A controls the moving mechanism 25 and drives an air cylinder (not shown) provided on the support unit 250 to sandwich the sewn object between the upper feed plate and the lower feed plate 25B. When the operator inputs a sewing start instruction via the operation unit 29, the control unit of the sewing machine 1A moves the needle bar 24A of the head 24 in the vertical direction. The sewing needle provided on the needle bar 24A moves in the vertical direction together with the needle bar 24A. The balance mechanism 24C of the head 24 and the hook mechanism in the bed portion 21 operate in conjunction with the needle bar 24A. The sewing machine 1A sews an object to be sewn by a needle thread 9 inserted through a sewing needle and a bobbin thread housed in a hook mechanism.
縫製の過程で、上糸9は糸駒から繰り出され、副糸調子器26、糸調子装置3A、糸案内27、28、及び天秤機構24Cに接触しながら、縫針に向けて移動する。図2に示すように、糸調子装置3Aの糸調子皿31は、巻き付いた上糸9の移動(矢印Y1)に応じ、前方から視た状態で時計回り方向(矢印Y2の方向)に移動する。この時、糸調子皿31に接触する回転体32A、32Bも、糸調子皿31の回転に応じて回転する。
In the sewing process, the needle thread 9 is unwound from the thread piece and moves toward the sewing needle while in contact with the auxiliary thread tensioner 26, the thread tensioning device 3A, the thread guides 27 and 28, and the balance mechanism 24C. As shown in FIG. 2, the thread tension plate 31 of the thread tension device 3A moves in the clockwise direction (direction of arrow Y2) in a state of being viewed from the front in response to the movement of the wound needle thread 9 (arrow Y1). .. At this time, the rotating bodies 32A and 32B that come into contact with the thread tension plate 31 also rotate according to the rotation of the thread tension plate 31.
なお、当接部材33A、33Bは、作業者が操作部29を介して入力した張力のレベルに応じた押圧力が押え部材34A、34Bから付与されることにより、回転体32A、32Bに押し付けられている。このため回転体32A、32Bには、回転を抑制する向きの摩擦負荷が当接部材33A、33Bから付与される。同時に回転体32A、32Bに接触する糸調子皿31には、回転を抑制する向きの摩擦負荷が回転体32A、32Bから付与される。糸調子皿31の回転が抑制されることに応じ、上糸9には張力が作用する。
The contact members 33A and 33B are pressed against the rotating bodies 32A and 32B by applying a pressing force corresponding to the level of tension input by the operator via the operation unit 29 from the pressing members 34A and 34B. ing. Therefore, a friction load in a direction for suppressing rotation is applied to the rotating bodies 32A and 32B from the contact members 33A and 33B. At the same time, a friction load in a direction for suppressing rotation is applied to the thread tension pan 31 in contact with the rotating bodies 32A and 32B from the rotating bodies 32A and 32B. Tension acts on the needle thread 9 in response to the suppression of the rotation of the thread tension plate 31.
なお、押え部材34A、34Bが当接部材33A、33Bを押圧する押圧力は、調整部材4Aにより、作業者が操作部29を介して入力した張力のレベルに応じて調整されている。このため、当接部材33A、33Bから回転体32A、32Bを介して糸調子皿31に付与される摩擦負荷も、作業者が操作部29を介して入力した張力のレベルに応じて調整される。結果、作業者が所望する張力が上糸に作用する。
The pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B is adjusted by the adjusting member 4A according to the level of tension input by the operator via the operation unit 29. Therefore, the frictional load applied to the thread tension pan 31 from the contact members 33A and 33B via the rotating bodies 32A and 32B is also adjusted according to the level of tension input by the operator via the operation unit 29. .. As a result, the tension desired by the operator acts on the needle thread.
なお、ミシン1Aでは、当接部材33A、33Bが回転体32A、32Bを介して糸調子皿31の回転に摩擦負荷を付与する。ここで、糸調子皿31と回転体32A、32Bは互いに独立して回転可能である。この場合、当接部材33A、33Bが糸調子皿31に直接接触して摩擦負荷を付与する場合と比べて、当接部材33A、33Bの摩耗量は抑制される。また、当接部材33A、33Bには中央に大きい貫通孔330が形成されるため、内径と外径との差異が小さく、回転により当接部材33A、33Bの表面にかかる力に大きく差が生じない。また、当接部材33A、33Bの貫通孔330に回転体32A、32Bの第二部322が挿通されることで、当接部材33A、33Bは回転体32Aに保持されるので、当接部材33A、33Bの径方向のズレも小さくできる。これにより、当接部材33A、33Bの片摩耗や破損を低減することができる。
In the sewing machine 1A, the contact members 33A and 33B apply a frictional load to the rotation of the thread tension pan 31 via the rotating bodies 32A and 32B. Here, the thread tension plate 31 and the rotating bodies 32A and 32B can rotate independently of each other. In this case, the amount of wear of the contact members 33A and 33B is suppressed as compared with the case where the contact members 33A and 33B are in direct contact with the thread tension pan 31 to apply a friction load. Further, since a large through hole 330 is formed in the center of the contact members 33A and 33B, the difference between the inner diameter and the outer diameter is small, and the rotation causes a large difference in the force applied to the surfaces of the contact members 33A and 33B. not. Further, by inserting the second portion 322 of the rotating bodies 32A and 32B into the through holes 330 of the contact members 33A and 33B, the contact members 33A and 33B are held by the rotating body 32A, so that the contact members 33A , 33B radial deviation can also be reduced. As a result, it is possible to reduce one-sided wear and damage of the contact members 33A and 33B.
<第一実施例>
図8は、本実施形態に係るミシン1Aと従来のミシンとの夫々を用いて縫製が行われた場合における上糸の張力を比較したグラフである。横軸は縫製時間を示す。縦軸は上糸の張力を示す。図8の結果から、従来のミシンにおける上糸の張力は、縫製の開始直後から増加する傾向があるのに対し、ミシン1Aにおける上糸の張力は、縫製時間が経過しても一定レベルで推移する傾向があることが分かった。従って、糸調子装置3Aを備えたミシン1Aを用いて縫製を行うことにより、従来のミシンと比べて上糸の張力の増加を抑制できることが分かった。 <First Example>
FIG. 8 is a graph comparing the tensions of the needle threads when sewing is performed using each of thesewing machine 1A according to the present embodiment and the conventional sewing machine. The horizontal axis indicates the sewing time. The vertical axis shows the tension of the needle thread. From the results shown in FIG. 8, the tension of the needle thread in the conventional sewing machine tends to increase immediately after the start of sewing, whereas the tension of the needle thread in the sewing machine 1A changes at a constant level even after the sewing time elapses. It turns out that there is a tendency to do. Therefore, it was found that by performing sewing using the sewing machine 1A equipped with the thread tensioning device 3A, it is possible to suppress an increase in the tension of the needle thread as compared with the conventional sewing machine.
図8は、本実施形態に係るミシン1Aと従来のミシンとの夫々を用いて縫製が行われた場合における上糸の張力を比較したグラフである。横軸は縫製時間を示す。縦軸は上糸の張力を示す。図8の結果から、従来のミシンにおける上糸の張力は、縫製の開始直後から増加する傾向があるのに対し、ミシン1Aにおける上糸の張力は、縫製時間が経過しても一定レベルで推移する傾向があることが分かった。従って、糸調子装置3Aを備えたミシン1Aを用いて縫製を行うことにより、従来のミシンと比べて上糸の張力の増加を抑制できることが分かった。 <First Example>
FIG. 8 is a graph comparing the tensions of the needle threads when sewing is performed using each of the
<第二実施例>
図9は、本実施形態に係るミシン1Aを用いて縫製を行った場合における当接部材33A、33Bの摩耗量を示すグラフである。横軸は縫製時間を示す。縦軸は当接部材33A、33Bの軸方向の厚みの変化量を、摩耗量として示す。なお、当接部材33A、33Bの厚みの変化量は、糸調子装置3Aの軸方向の全体厚み(押え部材34A、34B間の距離)を測定することによって特定された。図9の結果から、ミシン1Aにおける当接部材33A、33Bの摩耗量は、縫製時間が約2000時間を経過しても、ミシン1Aによる縫製が可能な摩耗量の限度(-0.9mm)を大きく下回ることが分かった。この結果から、ミシン1Aを用いて縫製を行うことにより、縫製時間が約2000時間である場合でも、糸調子装置3Aにより上糸に付与される張力を安定的に維持できることが分かった。 <Second Example>
FIG. 9 is a graph showing the amount of wear of the contact members 33A and 33B when sewing is performed using the sewing machine 1A according to the present embodiment. The horizontal axis indicates the sewing time. The vertical axis shows the amount of change in the axial thickness of the contact members 33A and 33B as the amount of wear. The amount of change in the thickness of the contact members 33A and 33B was specified by measuring the total thickness of the thread tensioning device 3A in the axial direction (distance between the pressing members 34A and 34B). From the results of FIG. 9, the wear amount of the contact members 33A and 33B in the sewing machine 1A is the limit of the wear amount (-0.9 mm) that can be sewn by the sewing machine 1A even if the sewing time has passed about 2000 hours. It turned out to be much lower. From this result, it was found that by sewing using the sewing machine 1A, the tension applied to the needle thread by the thread tensioning device 3A can be stably maintained even when the sewing time is about 2000 hours.
図9は、本実施形態に係るミシン1Aを用いて縫製を行った場合における当接部材33A、33Bの摩耗量を示すグラフである。横軸は縫製時間を示す。縦軸は当接部材33A、33Bの軸方向の厚みの変化量を、摩耗量として示す。なお、当接部材33A、33Bの厚みの変化量は、糸調子装置3Aの軸方向の全体厚み(押え部材34A、34B間の距離)を測定することによって特定された。図9の結果から、ミシン1Aにおける当接部材33A、33Bの摩耗量は、縫製時間が約2000時間を経過しても、ミシン1Aによる縫製が可能な摩耗量の限度(-0.9mm)を大きく下回ることが分かった。この結果から、ミシン1Aを用いて縫製を行うことにより、縫製時間が約2000時間である場合でも、糸調子装置3Aにより上糸に付与される張力を安定的に維持できることが分かった。 <Second Example>
FIG. 9 is a graph showing the amount of wear of the
<第三実施例>
図10は、本実施形態に係るミシン1Aが縫製を行った場合の縫目を、従来のミシンが縫製を行った場合の縫目と比較した結果を示す。図10の結果から、従来のミシンによる縫目に糸の撚り戻りが生じていることが確認されたのに対し、ミシン1Aによる縫目には糸の撚り戻りは生じていないことが確認された。なお、縫目の撚り戻りは、縫製時において糸調子皿31に対して上糸9が滑ることにより発生するものと推察される。従ってこの結果から、ミシン1Aの糸調子皿31の接触面Pに形成された抑制部T1により、糸調子皿31の接触面Pに対する上糸9の滑りを効果的に抑制できることが分かった。このため、糸調子装置3Aを備えたミシン1Aを用いて縫製を行うことにより、仕上がりの良好な縫目を形成できることが分かった。 <Third Example>
FIG. 10 shows the result of comparing the stitches when thesewing machine 1A according to the present embodiment is sewn with the stitches when the sewing machine 1A is sewn by the conventional sewing machine. From the results shown in FIG. 10, it was confirmed that the thread was untwisted in the stitches of the conventional sewing machine, whereas the thread was not untwisted in the stitches of the sewing machine 1A. .. It is presumed that the untwisting of the stitches occurs when the needle thread 9 slips on the thread tension plate 31 during sewing. Therefore, from this result, it was found that the restraining portion T1 formed on the contact surface P of the thread tension plate 31 of the sewing machine 1A can effectively suppress the slip of the needle thread 9 with respect to the contact surface P of the thread tension plate 31. Therefore, it has been found that a stitch having a good finish can be formed by sewing using the sewing machine 1A equipped with the thread tensioning device 3A.
図10は、本実施形態に係るミシン1Aが縫製を行った場合の縫目を、従来のミシンが縫製を行った場合の縫目と比較した結果を示す。図10の結果から、従来のミシンによる縫目に糸の撚り戻りが生じていることが確認されたのに対し、ミシン1Aによる縫目には糸の撚り戻りは生じていないことが確認された。なお、縫目の撚り戻りは、縫製時において糸調子皿31に対して上糸9が滑ることにより発生するものと推察される。従ってこの結果から、ミシン1Aの糸調子皿31の接触面Pに形成された抑制部T1により、糸調子皿31の接触面Pに対する上糸9の滑りを効果的に抑制できることが分かった。このため、糸調子装置3Aを備えたミシン1Aを用いて縫製を行うことにより、仕上がりの良好な縫目を形成できることが分かった。 <Third Example>
FIG. 10 shows the result of comparing the stitches when the
<第一実施形態の作用、効果>
糸調子装置3Aは、糸調子皿31と当接部材33A、33Bとの間に回転体32A、32Bを介在させることによって、糸調子皿31の回転に応じた当接部材33A、33Bの摩耗を抑制できる。従って糸調子装置3Aは、糸調子皿31に与える摩擦負荷が、当接部材33A、33Bの摩耗により変動することを抑制できるので、上糸9の張力を安定的に維持できる。 <Action and effect of the first embodiment>
Thethread tensioning device 3A causes the rotating bodies 32A and 32B to be interposed between the thread tensioning plate 31 and the contact members 33A and 33B, so that the contact members 33A and 33B are worn according to the rotation of the thread tensioning plate 31. Can be suppressed. Therefore, the thread tensioning device 3A can suppress the frictional load applied to the thread tensioning dish 31 from fluctuating due to the wear of the contact members 33A and 33B, so that the tension of the needle thread 9 can be stably maintained.
糸調子装置3Aは、糸調子皿31と当接部材33A、33Bとの間に回転体32A、32Bを介在させることによって、糸調子皿31の回転に応じた当接部材33A、33Bの摩耗を抑制できる。従って糸調子装置3Aは、糸調子皿31に与える摩擦負荷が、当接部材33A、33Bの摩耗により変動することを抑制できるので、上糸9の張力を安定的に維持できる。 <Action and effect of the first embodiment>
The
糸調子皿31は、巻付部31Aに巻き付けられた上糸9に接触可能な接触面Pに、上糸9の滑りを抑制する抑制部T1を備える。このため糸調子装置3Aは、巻付部31Aに対して上糸9が滑ることを、抑制部T1により抑制できる。又、上糸9が滑らないので、所望の張力を安定して上糸9に付与できる。従って、ミシン1Aは、仕上がりの良好な縫目を被縫製物に形成させることができる。又、回転体32A、32Bは、糸調子軸37との間に介在するベアリング30を備える。このため糸調子装置3Aは、糸調子軸37に対して回転体32A、32Bをスムーズに回転させることができる。
The thread tension plate 31 is provided with a restraining portion T1 for suppressing slippage of the needle thread 9 on a contact surface P that can come into contact with the needle thread 9 wound around the winding portion 31A. Therefore, the thread tensioning device 3A can prevent the needle thread 9 from slipping with respect to the winding portion 31A by the suppressing portion T1. Further, since the needle thread 9 does not slip, a desired tension can be stably applied to the needle thread 9. Therefore, the sewing machine 1A can form a stitch having a good finish on the sewn object. Further, the rotating bodies 32A and 32B include a bearing 30 interposed between the rotating bodies 32A and 32B and the thread tension shaft 37. Therefore, the thread tension device 3A can smoothly rotate the rotating bodies 32A and 32B with respect to the thread tension shaft 37.
当接部材33は貫通孔330を有するので、当接部材33の外径と内径との差異は小さくなる。このため、糸調子皿31及び回転体32の回転時において当接部材33の表面に作用する力の位置毎の相違量を小さくできる。又、回転体32は、第二部322が貫通孔330に挿通した状態で、回転体32の第二部322によって当接部材33を貫通孔330の内側から保持できる。従って、糸調子装置3Aは、使用による当接部材33の片摩耗や破損を低減できる。
Since the contact member 33 has a through hole 330, the difference between the outer diameter and the inner diameter of the contact member 33 becomes small. Therefore, it is possible to reduce the amount of difference for each position of the force acting on the surface of the contact member 33 when the thread tension plate 31 and the rotating body 32 are rotated. Further, the rotating body 32 can hold the contact member 33 from the inside of the through hole 330 by the second part 322 of the rotating body 32 in a state where the second part 322 is inserted into the through hole 330. Therefore, the thread tensioning device 3A can reduce one-sided wear and breakage of the contact member 33 due to use.
当接部材33は、回転体32Aに接触する当接部材33Aと、回転体32Bに当接する当接部材33Bとを有する。このため当接部材33は、糸調子皿31及び回転体32に対し、軸方向の両側から適切な摩擦負荷を与えることができるので、上糸9に対して付与された張力が適切な状態を、容易に維持できる。
The contact member 33 has a contact member 33A that comes into contact with the rotating body 32A and a contact member 33B that comes into contact with the rotating body 32B. Therefore, the contact member 33 can apply an appropriate frictional load to the thread tension plate 31 and the rotating body 32 from both sides in the axial direction, so that the tension applied to the needle thread 9 is in an appropriate state. , Easy to maintain.
回転体32Aの後面、及び回転体32Bの前面に、凹部320Aが設けられる。ベアリング30は、回転体32A、32Bの夫々の凹部320Aによって軸方向の両側から挟持される。この場合、糸調子装置3Aは、ベアリング30へのごみ等の侵入を、回転体32の簡易な構造により防止できる。
A recess 320A is provided on the rear surface of the rotating body 32A and on the front surface of the rotating body 32B. The bearing 30 is sandwiched from both sides in the axial direction by the recesses 320A of the rotating bodies 32A and 32B, respectively. In this case, the thread tensioning device 3A can prevent dust and the like from entering the bearing 30 by the simple structure of the rotating body 32.
調整部材4Aはソレノイド41を有する。調整部材4Aは、ソレノイド41がプランジャを介して軸42を駆動することにより、押え部材34A、34Bの軸方向における位置を調整する。これにより、押え部材34A、34Bが当接部材33A、33Bを押圧する場合の押圧力が調整される。このように調整部材4Aは、糸調子皿31に与える摩擦負荷の大きさを、ソレノイド41により容易に調整できる。
The adjusting member 4A has a solenoid 41. The adjusting member 4A adjusts the positions of the pressing members 34A and 34B in the axial direction by driving the shaft 42 via the plunger by the solenoid 41. As a result, the pressing force when the pressing members 34A and 34B press the contact members 33A and 33B is adjusted. As described above, the adjusting member 4A can easily adjust the magnitude of the frictional load applied to the thread tension pan 31 by the solenoid 41.
<第二実施形態>
第二実施形態に係るミシン1Bについて説明する。ミシン1Bは、糸調子装置3Aの代わりに糸調子装置3B(図11参照)が用いられるという点で、第一実施形態と相違する。糸調子装置3Bは、調整部材4Aの代わりに調整部材5A(図11参照)を有する。ミシン1Bにおいて調整部材5Aを除く他の構成はミシン1Aと同一であるので、説明を省略する。 <Second embodiment>
Thesewing machine 1B according to the second embodiment will be described. The sewing machine 1B differs from the first embodiment in that the thread tensioning device 3B (see FIG. 11) is used instead of the thread tensioning device 3A. The thread tensioning device 3B has an adjusting member 5A (see FIG. 11) instead of the adjusting member 4A. Since the other configurations of the sewing machine 1B except for the adjusting member 5A are the same as those of the sewing machine 1A, the description thereof will be omitted.
第二実施形態に係るミシン1Bについて説明する。ミシン1Bは、糸調子装置3Aの代わりに糸調子装置3B(図11参照)が用いられるという点で、第一実施形態と相違する。糸調子装置3Bは、調整部材4Aの代わりに調整部材5A(図11参照)を有する。ミシン1Bにおいて調整部材5Aを除く他の構成はミシン1Aと同一であるので、説明を省略する。 <Second embodiment>
The
図11に示すように、調整部材5Aは、糸調子台38に対して後側に配置される。調整部材5Aは、パルスモータ51、軸52、53を有する。パルスモータ51は、ミシン1Bの頭部24の後端部に、取付具51Aを介して取り付けられる。パルスモータ51は、内部で中空ロータを回転させることが可能である。内空ロータの内面には、ねじ山が形成される。軸52はボール螺子であり、中空ロータの内面のねじ山に螺合する。軸52は、内空ロータの回転により前後方向に移動する。軸52の前端部は、パルスモータ51から前方に突出する。軸53は、頭部24を軸方向に貫通する貫通孔240に配置される。軸53の後端部は、軸52の前端部に前方から接触する。軸53の前端部は、押圧軸39の後端部に後方から接触する。
As shown in FIG. 11, the adjusting member 5A is arranged on the rear side with respect to the thread tensioning table 38. The adjusting member 5A has a pulse motor 51 and shafts 52 and 53. The pulse motor 51 is attached to the rear end of the head portion 24 of the sewing machine 1B via the attachment 51A. The pulse motor 51 can rotate the hollow rotor inside. A thread is formed on the inner surface of the inner air rotor. The shaft 52 is a ball screw, which is screwed into a thread on the inner surface of the hollow rotor. The shaft 52 moves in the front-rear direction due to the rotation of the inner air rotor. The front end of the shaft 52 projects forward from the pulse motor 51. The shaft 53 is arranged in a through hole 240 that penetrates the head 24 in the axial direction. The rear end of the shaft 53 comes into contact with the front end of the shaft 52 from the front. The front end of the shaft 53 comes into contact with the rear end of the pressing shaft 39 from behind.
ミシン1Bの制御部は、調整部材5Aのパルスモータ51にパルス信号を出力する。パルスモータ51は、入力されたパルス信号に応じて内空ロータを回転させ、軸52の前端部を軸方向に移動させる。この場合、軸53の前端部に隣接した軸53は、貫通孔240内を軸方向に移動し、前端部に接触する押圧軸39及び押え部材34Bの軸方向の位置が変化する。この時、押え部材34A、34Bが当接部材33A、33Bを押圧する押圧力が変化する。これによって、糸調子皿31及び回転体32A、32Bの回転時において当接部材33A、33Bから摩擦負荷が付与される。
The control unit of the sewing machine 1B outputs a pulse signal to the pulse motor 51 of the adjusting member 5A. The pulse motor 51 rotates the inner air rotor in response to the input pulse signal, and moves the front end portion of the shaft 52 in the axial direction. In this case, the shaft 53 adjacent to the front end portion of the shaft 53 moves in the axial direction in the through hole 240, and the axial positions of the pressing shaft 39 and the pressing member 34B in contact with the front end portion change. At this time, the pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B changes. As a result, a frictional load is applied from the contact members 33A and 33B when the thread tension pan 31 and the rotating bodies 32A and 32B are rotated.
例えば作業者は、操作部29の押ボタンを操作し、糸調子装置3Bにより上糸9に付与する張力のレベルを入力する。ミシン1Bの制御部は、入力された張力のレベルに応じたパルス信号を、調整部材5Aのパルスモータ51に出力する。パルスモータ51は、パルス信号に応じた回転量分、内空ロータを回転して軸52を軸方向に移動する。軸53は、軸52の移動に応じて軸方向に移動し、押え部材34A、34Bが当接部材33A、33Bを押圧する押圧力が変化する。これにより、回転体32A、32B及び糸調子皿31の回転を抑制する向きの摩擦負荷が、当接部材33A、33Bから付与される。
For example, the operator operates the push button of the operation unit 29 and inputs the level of tension applied to the needle thread 9 by the thread tension device 3B. The control unit of the sewing machine 1B outputs a pulse signal corresponding to the input tension level to the pulse motor 51 of the adjusting member 5A. The pulse motor 51 rotates the inner air rotor by the amount of rotation corresponding to the pulse signal and moves the shaft 52 in the axial direction. The shaft 53 moves in the axial direction in accordance with the movement of the shaft 52, and the pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B changes. As a result, a friction load in a direction for suppressing the rotation of the rotating bodies 32A and 32B and the thread tension pan 31 is applied from the contact members 33A and 33B.
なお、当接部材33A、33Bから回転体32A、32B及び糸調子皿31に付与される摩擦負荷の大きさは、作業者により入力された張力のレベルに応じて調製される。このため、糸調子皿31の回転が抑制されることに応じ、作業者により入力されたレベルに応じた張力が、上糸9に作用する。このように調整部材5Aは、糸調子皿31に与える摩擦負荷の大きさを、パルスモータ51により容易に調整できる。
The magnitude of the frictional load applied to the rotating bodies 32A and 32B and the thread tension pan 31 from the contact members 33A and 33B is adjusted according to the level of tension input by the operator. Therefore, in response to the suppression of the rotation of the thread tension plate 31, the tension according to the level input by the operator acts on the needle thread 9. As described above, the adjusting member 5A can easily adjust the magnitude of the frictional load applied to the thread tension pan 31 by the pulse motor 51.
<第三実施形態>
第三実施形態に係るミシン1Cについて説明する。ミシン1Cは、糸調子装置3A、3Bの代わりに糸調子装置3C(図12参照)が用いられるという点で、第一実施形態及び第二実施形態と相違する。ミシン1Cにおいて糸調子装置3Cを除く他の構成はミシン1A、1Bと同一であるので、説明を省略する。 <Third embodiment>
Thesewing machine 1C according to the third embodiment will be described. The sewing machine 1C differs from the first embodiment and the second embodiment in that the thread tensioning device 3C (see FIG. 12) is used instead of the thread tensioning devices 3A and 3B. Since the other configurations of the sewing machine 1C except for the thread tensioning device 3C are the same as those of the sewing machines 1A and 1B, the description thereof will be omitted.
第三実施形態に係るミシン1Cについて説明する。ミシン1Cは、糸調子装置3A、3Bの代わりに糸調子装置3C(図12参照)が用いられるという点で、第一実施形態及び第二実施形態と相違する。ミシン1Cにおいて糸調子装置3Cを除く他の構成はミシン1A、1Bと同一であるので、説明を省略する。 <Third embodiment>
The
図12~図14に示すように、糸調子装置3Cは、調整部材4A、5Aの代わりに調整部材6Aを有するという点で、糸調子装置3A、3Bと相違する。糸調子装置3Cが有する糸調子皿31、回転体32A、32B、ベアリング30、当接部材33A、33B、押え部材34A、34B、糸取りばね36、糸調子台38の形状は、糸調子装置3A、3Bが夫々有する糸調子皿31、回転体32A、32B、ベアリング30、当接部材33A、33B、押え部材34A、34B、糸取りばね36、糸調子台38と同一である。
As shown in FIGS. 12 to 14, the thread tensioning device 3C differs from the thread tensioning devices 3A and 3B in that it has the adjusting member 6A instead of the adjusting members 4A and 5A. The shape of the thread tension plate 31, the rotating body 32A, 32B, the bearing 30, the contact members 33A, 33B, the presser members 34A, 34B, the thread take-up spring 36, and the thread tension base 38 included in the thread tension device 3C is the thread tension device 3A. It is the same as the thread tension plate 31, the rotating body 32A, 32B, the bearing 30, the contact members 33A, 33B, the presser members 34A, 34B, the thread take-up spring 36, and the thread tension base 38, which each of the 3Bs has.
図14に示すように、糸調子軸67は、基軸部67A及び一対の分割軸部67Bを有する。基軸部67Aは、糸調子装置3A、3Bにおける基軸部37A(図4参照)と同一の構成を有する。基軸部67Aは、第一基軸部371(図4参照)に対応する第一基軸部671、第二基軸部372(図4参照)に対応する第二基軸部672、及び、貫通孔370(図3参照)に対応する貫通孔670(図13参照)を有する。糸調子装置3A、3Bと異なり、貫通孔670に押圧軸39は挿通されない。図13に示すように、基軸部67Aの後端部は、糸調子台38の後端部から後方に僅かに突出し、頭部24の貫通孔240内で保持される。糸調子皿31、回転体32A、32B、当接部材33A、33B、押え部材34A、34B、及び、後述の調整部材6Aは、頭部24の前面から前方に突出する。
As shown in FIG. 14, the thread tension shaft 67 has a base shaft portion 67A and a pair of split shaft portions 67B. The base shaft portion 67A has the same configuration as the base shaft portion 37A (see FIG. 4) in the thread tensioning devices 3A and 3B. The base shaft portion 67A includes a first base shaft portion 671 corresponding to the first base shaft portion 371 (see FIG. 4), a second base shaft portion 672 corresponding to the second base shaft portion 372 (see FIG. 4), and a through hole 370 (FIG. 4). It has a through hole 670 (see FIG. 13) corresponding to 3). Unlike the thread tensioning devices 3A and 3B, the pressing shaft 39 is not inserted through the through hole 670. As shown in FIG. 13, the rear end portion of the base shaft portion 67A slightly protrudes rearward from the rear end portion of the thread tensioning table 38 and is held in the through hole 240 of the head 24. The thread tension plate 31, the rotating bodies 32A and 32B, the contact members 33A and 33B, the pressing members 34A and 34B, and the adjusting member 6A described later project forward from the front surface of the head 24.
一対の分割軸部67Bは、糸調子装置3A、3Bにおける一対の分割軸部37B(図4参照)よりも軸方向に長い。一対の分割軸部67Bは、糸調子皿31の貫通孔310、回転体32A、32Bの夫々の貫通孔320、押え部材34A、34Bの夫々の一対の貫通孔340を軸方向に貫通する。一対の分割軸部67Bの先端を含む部分は、押え部材34Aに対して前方に突出する。一対の分割軸部67Bの湾曲部のうち押え部材34Aよりも前側に突出する部分に、ねじ山68が形成されている。
The pair of split shaft portions 67B is longer in the axial direction than the pair of split shaft portions 37B (see FIG. 4) in the thread tensioning devices 3A and 3B. The pair of split shaft portions 67B penetrates the through holes 310 of the thread tension pan 31, the through holes 320 of the rotating bodies 32A and 32B, and the pair of through holes 340 of the pressing members 34A and 34B in the axial direction. The portion including the tip of the pair of split shaft portions 67B projects forward with respect to the pressing member 34A. A screw thread 68 is formed in a portion of the curved portion of the pair of split shaft portions 67B that protrudes forward from the pressing member 34A.
図12に示すように、調整部材6Aは、押え部材34Aに対して前側、言い換えれば、押え部材34Aに対し、軸方向において当接部材33A(図13、図14参照)が配置される側と反対側に配置される。調整部材6Aは、つまみ61、圧縮ばね62、及び受け皿63を有する。
As shown in FIG. 12, the adjusting member 6A is on the front side with respect to the pressing member 34A, in other words, on the side where the contact member 33A (see FIGS. 13 and 14) is arranged in the axial direction with respect to the pressing member 34A. Placed on the other side. The adjusting member 6A has a knob 61, a compression spring 62, and a saucer 63.
つまみ61は円柱状を有し、軸方向に延びる。つまみ61の周側面には、作業者が把持した時の滑り止めとして機能する凹凸が形成される。つまみ61には更に、軸方向に延びる貫通孔610が設けられる。貫通孔610の内面には、ねじ山が形成されている。貫通孔610に、糸調子軸67の一対の分割軸部67Bが挿通される。貫通孔610の内面に形成されたねじ山と、一対の分割軸部67Bのねじ山68とは螺合する。つまみ61の軸方向の位置は、一対の分割軸部67Bに対してつまみ61が回転することにより変化する。
The knob 61 has a columnar shape and extends in the axial direction. The peripheral side surface of the knob 61 is formed with irregularities that function as anti-slip when gripped by an operator. The knob 61 is further provided with a through hole 610 extending in the axial direction. A thread is formed on the inner surface of the through hole 610. A pair of split shaft portions 67B of the thread tension shaft 67 is inserted through the through hole 610. The thread formed on the inner surface of the through hole 610 and the thread 68 of the pair of split shaft portions 67B are screwed together. The axial position of the knob 61 changes as the knob 61 rotates with respect to the pair of split shaft portions 67B.
図12、図13に示すように、圧縮ばね62は、軸方向においてつまみ61と押え部材34Aとの間に配置される。図13、図14に示すように、圧縮ばね62は、後方に向かう程径が大きくなる円錐ばねである。圧縮ばね62と押え部材34Aとの間に受け皿63が介在する。受け皿63は略円形の板状を有し、軸方向と直交する。圧縮ばね62の弾性力は、受け皿63を介して押え部材34Aに作用する。これにより押え部材34Aは後方に移動し、当接部材33Aを回転体32Aに押し付ける。受け皿63には、一対の貫通孔630が設けられる。圧縮ばね62の中心、及び、受け皿63の一対の貫通孔630内に、一対の分割軸部67Bが配置される。
As shown in FIGS. 12 and 13, the compression spring 62 is arranged between the knob 61 and the pressing member 34A in the axial direction. As shown in FIGS. 13 and 14, the compression spring 62 is a conical spring whose diameter increases toward the rear. A saucer 63 is interposed between the compression spring 62 and the pressing member 34A. The saucer 63 has a substantially circular plate shape and is orthogonal to the axial direction. The elastic force of the compression spring 62 acts on the pressing member 34A via the saucer 63. As a result, the pressing member 34A moves backward and presses the contact member 33A against the rotating body 32A. The saucer 63 is provided with a pair of through holes 630. A pair of split shaft portions 67B are arranged in the center of the compression spring 62 and in the pair of through holes 630 of the saucer 63.
作業者がつまみ61を回転させて軸方向に移動させる操作を行った場合、つまみ61と受け皿63との間の間隔は変化し、圧縮ばね62の圧縮度合も変化する。この時、圧縮ばね62が弾性力により押え部材34Aを後方に押し付ける力も変化する。この場合、押え部材34A、34Bが当接部材33A、33Bを軸方向の両側から押圧する押圧力が変化する。つまり、調整部材6Aは、つまみ61が回転して軸方向の位置が調整されることに応じ、押え部材34A、34Bが当接部材33A、33Bを押圧する押圧力を調整できる。この場合、糸調子皿31及び回転体32A、32Bが回転する時に当接部材33A、33Bから付与される摩擦負荷も調整される。
When the operator rotates the knob 61 to move it in the axial direction, the distance between the knob 61 and the saucer 63 changes, and the degree of compression of the compression spring 62 also changes. At this time, the force with which the compression spring 62 presses the pressing member 34A rearward due to the elastic force also changes. In this case, the pressing force that the pressing members 34A and 34B press the contact members 33A and 33B from both sides in the axial direction changes. That is, the adjusting member 6A can adjust the pressing force by which the pressing members 34A and 34B press the contact members 33A and 33B in response to the rotation of the knob 61 to adjust the position in the axial direction. In this case, the frictional load applied from the contact members 33A and 33B when the thread tension pan 31 and the rotating bodies 32A and 32B rotate is also adjusted.
例えば作業者は、つまみ61を回転させる操作を行い、つまみ61の軸方向の位置を調節する。これにより、圧縮ばね62から受け皿63を介して押え部材34Aに作用する弾性力の大きさが変化するので、押え部材34A、34Bが当接部材33A、33Bを押圧する押圧力も変化する。これにより、回転体32A、32B及び糸調子皿31の回転を抑制する向きの摩擦負荷が、当接部材33A、33Bから付与される。
For example, the operator performs an operation of rotating the knob 61 to adjust the position of the knob 61 in the axial direction. As a result, the magnitude of the elastic force acting on the pressing member 34A from the compression spring 62 via the saucer 63 changes, so that the pressing force with which the pressing members 34A and 34B press the contact members 33A and 33B also changes. As a result, a friction load in a direction for suppressing the rotation of the rotating bodies 32A and 32B and the thread tension pan 31 is applied from the contact members 33A and 33B.
なお、当接部材33A、33Bから回転体32A、32B及び糸調子皿31に付与される摩擦負荷の大きさは、作業者がつまみ61を回転させるときの回転量及び回転方向に応じて調製される。このため、糸調子皿31の回転が抑制されることに応じ、作業者により調節されたつまみ61の回転量及び回転方向に応じた張力が、上糸9に作用する。このように調整部材6Aは、糸調子皿31に与える摩擦負荷の大きさを、つまみ61の軸方向の位置を調整することにより容易に調整できる。
The magnitude of the frictional load applied to the rotating bodies 32A and 32B and the thread tension pan 31 from the contact members 33A and 33B is adjusted according to the amount of rotation and the direction of rotation when the operator rotates the knob 61. To. Therefore, in response to the suppression of the rotation of the thread tension plate 31, the rotation amount of the knob 61 adjusted by the operator and the tension according to the rotation direction act on the needle thread 9. As described above, the adjusting member 6A can easily adjust the magnitude of the frictional load applied to the thread tension pan 31 by adjusting the axial position of the knob 61.
<変形例>
本開示は上記実施形態に限定されず、種々の変更が可能である。以下、第一実施形態に係るミシン1A及び糸調子装置3Aを例に挙げて変形例を説明するが、適宜、ミシン1B、1C、及び、糸調子装置3B、3Cにも適用可能であることはいうまでもない。 <Modification example>
The present disclosure is not limited to the above embodiment, and various modifications can be made. Hereinafter, a modified example will be described by taking thesewing machine 1A and the thread tensioning device 3A according to the first embodiment as an example, but it may be applicable to the sewing machines 1B, 1C, and the thread tensioning devices 3B, 3C as appropriate. Needless to say.
本開示は上記実施形態に限定されず、種々の変更が可能である。以下、第一実施形態に係るミシン1A及び糸調子装置3Aを例に挙げて変形例を説明するが、適宜、ミシン1B、1C、及び、糸調子装置3B、3Cにも適用可能であることはいうまでもない。 <Modification example>
The present disclosure is not limited to the above embodiment, and various modifications can be made. Hereinafter, a modified example will be described by taking the
糸調子装置3Aは、糸調子皿31と回転体32A、32Bとの間に中間体を介在させてもよい。この場合、回転体32A、32Bは糸調子皿31に隣接し、接触しなくてもよい。糸調子装置3Aは、回転体32A、32Bの何れか一方のみ有してもよい。例えば、糸調子装置3Aが回転体32Aのみ有する場合、当接部材33Bは、糸調子皿31に後側から直接接触してもよい。一方、例えば、糸調子装置3Aが回転体32Bのみ有する場合、当接部材33Aは、糸調子皿31に前側から直接接触してもよい。
In the thread tension device 3A, an intermediate may be interposed between the thread tension plate 31 and the rotating bodies 32A and 32B. In this case, the rotating bodies 32A and 32B do not have to be in contact with each other because they are adjacent to the thread tension pan 31. The thread tensioning device 3A may have only one of the rotating bodies 32A and 32B. For example, when the thread tension device 3A has only the rotating body 32A, the contact member 33B may directly contact the thread tension plate 31 from the rear side. On the other hand, for example, when the thread tension device 3A has only the rotating body 32B, the contact member 33A may directly contact the thread tension plate 31 from the front side.
糸調子皿31及び回転体32A、32Bは、接着剤等により接着されてもよい。回転体32A、32B及びベアリングは、接着剤等により接着されてもよい。
The thread tension plate 31 and the rotating bodies 32A and 32B may be adhered with an adhesive or the like. The rotating bodies 32A and 32B and the bearing may be adhered with an adhesive or the like.
抑制部T1は、上糸の滑りを抑制可能な他の構成に適宜変更可能である。例えば図15(A)に示すように、抑制部T2として、基部311の中心とした半径方向と直交し、且つ直線状に延びる複数の溝を有してもよい。又、例えば図15(B)に示すように、抑制部T3として、半径方向に沿って直線状に延びる複数の溝を有していてもよい。あるいは、上記実施例では同心円の複数の弧状の溝としていたが、同心円ではなく同じ曲率の弧や同じ形状の曲線が複数並んだ溝であっても良いし、格子状に溝が切られたものであっても良い。更には、抑制部はレーザ加工による溝加工により構成されるものに限らず、プレス可能により凹凸が形成されるものや、ブラスト加工により接触面Pの表面が荒らされたもの、コート剤や溶射等により異なる素材が接触面Pの表面に部分的に付与されるものであっても良い。
The restraining unit T1 can be appropriately changed to another configuration capable of suppressing the slip of the needle thread. For example, as shown in FIG. 15A, the restraining portion T2 may have a plurality of grooves that are orthogonal to the radial direction of the center of the base portion 311 and extend linearly. Further, for example, as shown in FIG. 15B, the restraining portion T3 may have a plurality of grooves extending linearly along the radial direction. Alternatively, in the above embodiment, a plurality of arc-shaped grooves of concentric circles are used, but instead of concentric circles, a groove having a plurality of arcs having the same curvature or curves having the same shape may be arranged, or the grooves may be cut in a grid pattern. It may be. Furthermore, the suppression portion is not limited to the one formed by grooving by laser processing, the one in which unevenness is formed by pressability, the one in which the surface of the contact surface P is roughened by blasting, a coating agent, thermal spraying, etc. A different material may be partially applied to the surface of the contact surface P.
ベアリング30は、回転体32A、32Bの代わりに糸調子皿31に設けられてもよい。
The bearing 30 may be provided on the thread tension plate 31 instead of the rotating bodies 32A and 32B.
調整部材4Aにおけるソレノイド41、及び、調整部材5Aにおけるパルスモータ51の代わりに、押え部材34Bの軸方向の位置を調整可能な他の機構が用いられてもよい。例えば調整部材は、リニアモータにより押圧軸39を軸方向に移動することによって、押え部材34Bの軸方向の位置を調整してもよい。
Instead of the solenoid 41 in the adjusting member 4A and the pulse motor 51 in the adjusting member 5A, another mechanism capable of adjusting the axial position of the pressing member 34B may be used. For example, the adjusting member may adjust the axial position of the pressing member 34B by moving the pressing shaft 39 in the axial direction by a linear motor.
糸調子装置3Aは、ミシン1Aにて例示した門型ミシン以外のミシンにも適用可能であることはいうまでもない。例えば糸調子装置3Aは、ベッド部,脚柱部,及びアーム部を備えた周知のミシン(例えば、家庭用ミシン)に適用されてもよい。
Needless to say, the thread tensioning device 3A can be applied to sewing machines other than the portal type sewing machine exemplified in the sewing machine 1A. For example, the thread tensioning device 3A may be applied to a well-known sewing machine having a bed portion, a pedestal portion, and an arm portion (for example, a household sewing machine).
<その他>
前側は、「軸方向の一方側」の一例である。後側は、「軸方向の他方側」の一例である。回転体32Aは、第一回転体の一例である。回転体32Bは、第二回転体の一例である。当接部材33Aは、第一当接部材の一例である。当接部材33Bは、第二当接部材の一例である。回転体32Aの凹部320Aは、第一凹部の一例である。回転体32Bの凹部320Aは、第二凹部の一例である。ミシン1A、1B、1Cは、縫製装置の一例である。 <Others>
The front side is an example of "one side in the axial direction". The rear side is an example of "the other side in the axial direction". Therotating body 32A is an example of the first rotating body. The rotating body 32B is an example of the second rotating body. The contact member 33A is an example of the first contact member. The contact member 33B is an example of the second contact member. The recess 320A of the rotating body 32A is an example of the first recess. The recess 320A of the rotating body 32B is an example of the second recess. Sewing machines 1A, 1B and 1C are examples of sewing machines.
前側は、「軸方向の一方側」の一例である。後側は、「軸方向の他方側」の一例である。回転体32Aは、第一回転体の一例である。回転体32Bは、第二回転体の一例である。当接部材33Aは、第一当接部材の一例である。当接部材33Bは、第二当接部材の一例である。回転体32Aの凹部320Aは、第一凹部の一例である。回転体32Bの凹部320Aは、第二凹部の一例である。ミシン1A、1B、1Cは、縫製装置の一例である。 <Others>
The front side is an example of "one side in the axial direction". The rear side is an example of "the other side in the axial direction". The
1A、1B、1C :ミシン
3A、3B、3C :糸調子装置
4A、5A、6A :調整部材
30 :ベアリング
31 :糸調子皿
31A :巻付部
32、32A、32B :回転体
33、33A、33B :当接部材
34、34A、34B :押え部材
37、67 :糸調子軸
41 :ソレノイド
51 :パルスモータ
61 :つまみ
62 :圧縮ばね
S1 :内側接触部
S2 :外側接触部
T1、T2、T3 :抑制部 1A, 1B, 1C: Sewing machine 3A, 3B, 3C: Thread tensioning device 4A, 5A, 6A: Adjusting member 30: Bearing 31: Thread tensioning plate 31A: Winding part 32, 32A, 32B: Rotating body 33, 33A, 33B : Contact member 34, 34A, 34B: Presser member 37, 67: Thread tension shaft 41: Solenoid 51: Pulse motor 61: Knob 62: Compression spring S1: Inner contact part S2: Outer contact part T1, T2, T3: Suppression Department
3A、3B、3C :糸調子装置
4A、5A、6A :調整部材
30 :ベアリング
31 :糸調子皿
31A :巻付部
32、32A、32B :回転体
33、33A、33B :当接部材
34、34A、34B :押え部材
37、67 :糸調子軸
41 :ソレノイド
51 :パルスモータ
61 :つまみ
62 :圧縮ばね
S1 :内側接触部
S2 :外側接触部
T1、T2、T3 :抑制部 1A, 1B, 1C:
Claims (10)
- 縫糸を巻付ける巻付部を有し、前記巻付部に巻き付けられた前記縫糸の移動により回転可能な糸調子皿と、
前記糸調子皿の回転中心を通って軸方向に延びる糸調子軸と、
前記糸調子軸に対して回転可能に支持され、且つ、前記糸調子皿に対して前記軸方向の一方側及び他方側の少なくとも一方に隣接し、前記糸調子皿の回転に応じて回転する回転体と、
前記回転体のうち、前記糸調子皿との接触部分である内側接触部に対して前記軸方向の反対側の部分である外側接触部に接触する当接部材と、
前記当接部材を前記回転体に押し付け、前記回転体及び前記糸調子皿の回転時に摩擦負荷を与える押え部材と、
前記押え部材を前記当接部材に押し付ける押圧力を調整する調整部材と
を備えたことを特徴とする糸調子装置。 A thread tension plate that has a winding portion around which the sewing thread is wound and is rotatable by the movement of the sewing thread wound around the winding portion.
A thread tension shaft extending in the axial direction through the center of rotation of the thread tension plate, and
Rotation that is rotatably supported with respect to the thread tension plate, is adjacent to at least one of the axial direction and the other side of the thread tension plate, and rotates according to the rotation of the thread tension plate. With the body
Of the rotating body, a contact member that comes into contact with an outer contact portion that is a portion on the opposite side in the axial direction with respect to an inner contact portion that is a contact portion with the thread tension pan.
A pressing member that presses the contact member against the rotating body and gives a frictional load when the rotating body and the thread tension pan are rotated.
A thread tensioning device including an adjusting member for adjusting a pressing force for pressing the pressing member against the abutting member. - 前記糸調子皿は、
前記巻付部に巻き付けられた前記縫糸に接触可能な接触面に、前記縫糸の滑りを抑制する抑制部を備えたことを特徴とする請求項1に記載の糸調子装置。 The thread tension plate is
The thread tensioning device according to claim 1, wherein a contact surface that is wound around the winding portion and is in contact with the sewing thread is provided with a suppressing portion that suppresses slippage of the sewing thread. - 前記回転体は、前記軸方向に隣接する第一部と第二部を有し、前記第一部の外径は前記第二部の外径より大きく、
前記当接部材は、貫通孔を有し、前記貫通孔に前記回転体の前記第二部が挿通されることを特徴とする請求項1又は2に記載の糸調子装置。 The rotating body has a first part and a second part adjacent to each other in the axial direction, and the outer diameter of the first part is larger than the outer diameter of the second part.
The thread tensioning device according to claim 1 or 2, wherein the abutting member has a through hole, and the second portion of the rotating body is inserted into the through hole. - 前記回転体は、
前記糸調子皿の前記軸方向の一方に設けられる第一回転体と、前記軸方向の他方に設けられる第二回転体とを含み、
前記当接部材は、前記第一回転体に当接する第一当接部材と、前記第二回転体に当接する第二当接部材とを含む
ことを特徴とする請求項1から3の何れかに記載の糸調子装置。 The rotating body is
A first rotating body provided on one side of the thread tension pan in the axial direction and a second rotating body provided on the other side in the axial direction are included.
Any of claims 1 to 3, wherein the abutting member includes a first abutting member that abuts on the first rotating body and a second abutting member that abuts on the second rotating body. The thread tensioning device according to. - 前記回転体と前記糸調子軸との間に介在するベアリングを更に備えたことを特徴とする請求項1から4の何れかに記載の糸調子装置。 The thread tension device according to any one of claims 1 to 4, further comprising a bearing interposed between the rotating body and the thread tension shaft.
- 前記第一回転体には、前記他方を向く面に第一凹部が設けられ、
前記第二回転体には、前記一方を向く面に第二凹部が設けられ、
前記回転体と前記糸調子軸との間に介在するベアリングを更に備え、
前記ベアリングは、前記第一凹部と前記第二凹部によって挟持される
ことを特徴とする請求項4に記載の糸調子装置。 The first rotating body is provided with a first recess on the surface facing the other.
The second rotating body is provided with a second recess on the surface facing the one side.
Further provided with a bearing interposed between the rotating body and the thread tension shaft,
The thread tensioning device according to claim 4, wherein the bearing is sandwiched between the first recess and the second recess. - 前記調整部材は、
ソレノイドを少なくとも含み、
前記ソレノイドの駆動に応じて前記押え部材の前記軸方向における位置を調整することにより、前記押圧力を調整する
ことを特徴する請求項1から6の何れかに記載の糸調子装置。 The adjusting member is
Including at least solenoid,
The thread tensioning device according to any one of claims 1 to 6, wherein the pressing force is adjusted by adjusting the position of the pressing member in the axial direction in response to the driving of the solenoid. - 前記調整部材は、
前記押え部材に対し、前記軸方向において前記当接部材が配置される側と反対側に配置され、前記軸方向における位置の調整が可能なつまみと、前記つまみ及び前記押え部材の間に介在する圧縮ばねとを少なくとも有し、
前記押え部材は、
前記圧縮ばねの弾性力が作用することにより、前記当接部材を前記回転体に押し付け、
前記調整部材は、
前記つまみの前記軸方向における位置を調整することにより、前記押圧力を調節することを特徴とする請求項1から6の何れかに記載の糸調子装置。 The adjusting member is
It is interposed between the knob and the presser member, which are arranged on the side opposite to the side where the contact member is arranged in the axial direction and whose position can be adjusted in the axial direction with respect to the presser member. Has at least a compression spring and
The presser member is
By the elastic force of the compression spring, the contact member is pressed against the rotating body, and the contact member is pressed against the rotating body.
The adjusting member is
The thread tensioning device according to any one of claims 1 to 6, wherein the pressing force is adjusted by adjusting the position of the knob in the axial direction. - 前記調整部材は、
パルスモータを少なくとも含み、
前記パルスモータの駆動に応じて前記押え部材の前記軸方向における位置を調整することにより、前記押圧力を調整する
ことを特徴とする請求項1から6の何れかに記載の糸調子装置。 The adjusting member is
Including at least a pulse motor,
The thread tensioning device according to any one of claims 1 to 6, wherein the pressing force is adjusted by adjusting the position of the pressing member in the axial direction according to the driving of the pulse motor. - 請求項1から9の何れかに記載の糸調子装置と
上下方向に延び、縫針を下端に装着可能であり、上下動可能な針棒と、
を備えたことを特徴とする縫製装置。 A needle bar that extends in the vertical direction with the thread tensioning device according to any one of claims 1 to 9, has a sewing needle that can be attached to the lower end, and can move up and down.
A sewing device characterized by being equipped with.
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5675197A (en) * | 1979-11-07 | 1981-06-22 | Singer Co | Sewing machine |
US4545311A (en) * | 1984-08-02 | 1985-10-08 | The Singer Company | Thread tensioning device for a sewing machine |
US5156105A (en) * | 1991-09-23 | 1992-10-20 | Wang Shui Nu | Thread tension adjusting device for a sewing machine |
WO2005100666A1 (en) * | 2004-04-01 | 2005-10-27 | Kinoshita Precision Industrial Co. Ltd. | Sewing machine |
JP2017192573A (en) * | 2016-04-21 | 2017-10-26 | Juki株式会社 | Thread tension device of sewing machine |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP5675197B2 (en) | 2010-07-26 | 2015-02-25 | オリンパスイメージング株式会社 | Display device |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5675197A (en) * | 1979-11-07 | 1981-06-22 | Singer Co | Sewing machine |
US4545311A (en) * | 1984-08-02 | 1985-10-08 | The Singer Company | Thread tensioning device for a sewing machine |
US5156105A (en) * | 1991-09-23 | 1992-10-20 | Wang Shui Nu | Thread tension adjusting device for a sewing machine |
WO2005100666A1 (en) * | 2004-04-01 | 2005-10-27 | Kinoshita Precision Industrial Co. Ltd. | Sewing machine |
JP2017192573A (en) * | 2016-04-21 | 2017-10-26 | Juki株式会社 | Thread tension device of sewing machine |
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