CN211079585U - Sewing machine and thread trimming needle pitch control device thereof - Google Patents
Sewing machine and thread trimming needle pitch control device thereof Download PDFInfo
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- CN211079585U CN211079585U CN201921817666.0U CN201921817666U CN211079585U CN 211079585 U CN211079585 U CN 211079585U CN 201921817666 U CN201921817666 U CN 201921817666U CN 211079585 U CN211079585 U CN 211079585U
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Abstract
The utility model discloses a sewing machine and trimming gauge needle controlling means thereof, trimming gauge needle controlling means includes trimming auxiliary crank, the trimming crankshaft, trimming crank connecting rod, trimming cam and step motor, trimming auxiliary crank is fixed with the knife rest connecting rod of trimming subassembly and is linked to each other, the first end of trimming crankshaft is fixed with trimming auxiliary crank and is linked to each other, the second end is fixed with the first end of trimming crank connecting rod and is linked to each other, the second end of trimming crank connecting rod is fixed with the transmission pin axle, trimming cam fixes on step motor's output shaft, trimming cam's periphery has concentric periphery and irregular circle drive face, the transmission pin axle is located trimming cam one side and cooperates with trimming cam's periphery tangency; when needing the trimming, step motor's output shaft rotates, through trimming cam, trimming crank connecting rod, trimming crank axle and trimming auxiliary crank's transmission, drives the motion of trimming subassembly, realizes the trimming operation, utilizes step motor to replace the electro-magnet, simple structure, and the control precision is higher.
Description
Technical Field
The utility model relates to a sewing machine technical field especially relates to a thread trimming gauge needle controlling means. In addition, the utility model discloses still relate to a sewing machine including above-mentioned thread trimming gauge needle controlling means.
Background
With the progress of the technology, most of the existing sewing machines are provided with a stitch length adjusting mechanism and a thread trimming mechanism so as to meet different sewing requirements and improve the automation degree of the sewing machine.
At present, a stitch length adjusting mechanism is driven by a backstitch electromagnet and an encryption stitch electromagnet to realize backstitch and stitch length reduction operation, a thread trimming mechanism is driven by a thread trimming electromagnet, the thread trimming mechanism realizes thread trimming operation under the driving of the thread trimming electromagnet after sewing is finished, and the three electromagnets occupy larger space, have higher cost and are difficult to control.
Therefore, how to simplify the stitch length adjusting mechanism and the thread trimming mechanism and reduce the cost and the occupied space is a technical problem to be solved by the technical personnel in the field at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a trimming gauge needle controlling means, it utilizes step motor to replace the electro-magnet, simple structure, and the control precision is higher and the cost is lower. The utility model also aims to provide a sewing machine comprising the thread trimming gauge needle control device.
In order to solve the technical problem, the utility model provides a sewing machine's trimming gauge needle controlling means, including trimming auxiliary crank, trimming crank axle, trimming crank connecting rod, trimming cam and step motor, trimming auxiliary crank links to each other with the knife rest connecting rod of trimming subassembly is fixed, the first end of trimming crank axle with trimming auxiliary crank is fixed to be linked to each other, the second end with trimming crank connecting rod's first end is fixed to be linked to each other, trimming crank connecting rod's second end is fixed with the transmission pin axle, trimming cam fixes on step motor's the output shaft, trimming cam's periphery has concentric periphery and irregular circle drive face, the transmission pin axle is located trimming cam one side and with trimming cam's tangent cooperation in periphery, trimming crank axle's the relative casing in position is fixed, just step motor can pass through trimming cam with trimming crank connecting rod drives trimming crank axle is rotatory around its central axis.
Preferably, the trimming crank shaft and the output shaft of the stepping motor are both parallel to the feeding main shaft, the trimming crank connecting rod is perpendicular to the trimming crank shaft, and the transmission pin shaft is parallel to the feeding main shaft.
Preferably, the second end cover of trimming crankshaft has a first reset torsion spring, the one end of first reset torsion spring be the zigzag and block in on the trimming crank connecting rod, the other end is fixed on the casing.
Preferably, the second end of trimming crankshaft upwards processes the joint plane that is used for the location in circumference, the first end of trimming crank connecting rod be equipped with the card hole that matches is held to the second of trimming crankshaft, the second end of trimming crankshaft inserts in the card hole and pass through the fix with screw.
Preferably, the device also comprises a feeding cam, a feeding connecting rod shaft and a feeding assembly, wherein the output shaft of the stepping motor comprises a first output shaft and a second output shaft which are coaxial and extend reversely, the trimming cam is fixed on the first output shaft, the feeding cam is fixed on the second output shaft, the periphery of the feeding cam is provided with a concentric circumferential surface and an eccentric driving surface, the feeding connecting rod shaft is parallel to the feeding main shaft and the position of the feeding connecting rod shaft is fixed relative to the machine shell, the first end of the feeding connecting rod shaft is fixed on the feeding assembly, the second end of the feeding connecting rod shaft is fixedly connected with the first end of the feeding connecting rod, the second end of the feeding connecting rod is provided with a transmission rotating shaft, the transmission rotating shaft is positioned on one side of the feeding cam and is in tangential fit with the periphery of the feeding cam, and the stepping motor can drive the feeding connecting rod shaft, when the transmission pin shaft is matched with the irregular round driving surface of the trimming cam in a tangent mode, the transmission rotating shaft is in contact with the concentric circumferential surface of the feeding cam, and when the transmission rotating shaft is matched with the eccentric driving surface of the feeding cam in a tangent mode, the transmission pin shaft is in contact with the concentric circumferential surface of the trimming cam.
Preferably, the thread trimming crank connecting rod is positioned below the thread trimming cam, and the feeding connecting rod is positioned above the feeding cam.
Preferably, the outer periphery of the trimming cam comprises a concentric circumferential surface of 2/5 and an irregular circular drive surface of 3/5, and the outer periphery of the feed cam comprises a concentric circumferential surface of 3/4 and an eccentric drive surface of 1/4.
Preferably, the second end sleeve of pay-off connecting rod axle has the second reset torsion spring, the one end of second reset torsion spring is the zigzag and blocks in on the pay-off connecting rod, the other end block is on the casing.
Preferably, clamping planes for positioning are machined on the two ends of the feeding connecting rod shaft in the circumferential direction, and the two clamping planes are arranged in a staggered mode.
The utility model also provides a sewing machine, including above-mentioned arbitrary one the thread trimming gauge needle controlling means.
The utility model provides a sewing machine's trimming gauge needle controlling means, including trimming auxiliary crank, the trimming crankshaft, trimming crank connecting rod, trimming cam and step motor, trimming auxiliary crank links to each other with the knife rest connecting rod of trimming subassembly is fixed, the first end of trimming crankshaft links to each other with trimming auxiliary crank is fixed, the second end links to each other with trimming crank connecting rod's first end is fixed, trimming crank connecting rod's second end is fixed with the transmission round pin axle, trimming cam fixes on step motor's output shaft, trimming cam's periphery has concentric periphery and irregular circle drive face, the transmission round pin axle is located trimming cam one side and with the tangent cooperation in trimming cam's periphery, trimming crank shaft's relative casing is fixed, and step motor can drive trimming crankshaft around its central axis rotation through trimming cam and trimming crank connecting rod.
When the trimming is needed, corresponding command signals are sent to the stepping motor, so that an output shaft of the stepping motor drives the trimming cam to rotate by a corresponding angle, and the trimming cam rotates by utilizing an irregular circle driving surface of the trimming cam to drive the trimming crank connecting rod to rotate around the central axis of the trimming crank shaft and then drive the trimming assembly to swing around the trimming crank shaft through the transmission belts of the trimming crank shaft and the trimming auxiliary crank because the transmission pin shaft is in tangential fit with the periphery of the trimming cam; utilize step motor to replace the electro-magnet, simple structure, the control precision is higher.
The utility model provides a sewing machine includes above-mentioned thread trimming gauge needle controlling means, because above-mentioned thread trimming gauge needle controlling means has above-mentioned technological effect, above-mentioned sewing machine also should have same technological effect, no longer introduces in detail here.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a thread trimming gauge needle control device provided in the present invention;
fig. 2 is another schematic structural diagram of an embodiment of the thread trimming gauge needle control device according to the present invention;
fig. 3 is a schematic structural diagram of an embodiment of a trimming crank link according to the present invention;
fig. 4 is a schematic structural diagram of an embodiment of a trimming cam according to the present invention;
fig. 5 is a schematic structural diagram of an embodiment of a feeding cam according to the present invention;
fig. 6 is a schematic structural diagram of a feeding link according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a specific embodiment of the first and second reset torsion springs provided by the present invention.
The drawings are numbered as follows:
the wire cutting machine comprises a wire cutting component 1, a tool rest connecting rod 2, a wire cutting auxiliary crank 3, a wire cutting crank shaft 4, a first reset torsion spring 5, a wire cutting crank connecting rod 6, a transmission pin shaft 6-1, a wire cutting cam 7, a stepping motor 8, a feeding cam 9, a feeding connecting rod 10, a transmission rotating shaft 10-1, a feeding connecting rod shaft 11, a feeding component 12, a second reset torsion spring 13 and a feeding main shaft 14.
Detailed Description
The core of the utility model is to provide a thread trimming needle pitch controlling means, it utilizes step motor to replace the electro-magnet, simple structure, and the control precision is higher and the cost is lower. The other core of the utility model is to provide a sewing machine comprising the thread trimming gauge needle control device.
In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.
Referring to fig. 1 to 4, fig. 1 is a schematic structural diagram of a thread trimming gauge needle control device according to an embodiment of the present invention; fig. 2 is another schematic structural diagram of an embodiment of the thread trimming gauge needle control device according to the present invention; fig. 3 is a schematic structural diagram of an embodiment of a trimming crank link according to the present invention; fig. 4 is a schematic structural diagram of a specific embodiment of the trimming cam according to the present invention.
The utility model discloses embodiment provides a trimming gauge needle controlling means of sewing machine, it is main including trimming auxiliary crank 3, trimming crankshaft 4, trimming crank connecting rod 6, trimming cam 7 and step motor 8, wherein, trimming auxiliary crank 3 links to each other with the knife rest connecting rod 2 of trimming subassembly 1 is fixed, trimming crank shaft 4's first end links to each other with trimming auxiliary crank 3 is fixed, the second end links to each other with trimming crank connecting rod 6's first end is fixed, and trimming crank shaft 4's the relative casing in position is fixed, trimming crank connecting rod 6's second end is fixed with transmission pin shaft 6-1, trimming cam 7 is fixed on step motor 8's output shaft, trimming cam 7's periphery has concentric periphery and irregular crank shaft drive face, transmission pin shaft 6-1 is located trimming cam 7 one side and tangent cooperation with trimming cam 7's periphery, and step motor 8 can drive through trimming cam 7 and trimming crank connecting rod 6 trimming cam 4 around its central axis 4 And (4) rotating.
Wherein, according to the conventional structure of the sewing machine, the thread cutting crank shaft 4 and the output shaft of the stepping motor 8 are preferably parallel to the feeding main shaft 14, in order to ensure the smooth transmission and conveniently control the thread cutting operation, the thread cutting crank connecting rod 6 is preferably vertical to the thread cutting crank shaft 4, and the transmission pin shaft 6-1 is parallel to the feeding main shaft 14.
When a thread is required to be cut, a corresponding instruction signal is sent to the stepping motor 8, the output shaft of the stepping motor 8 drives the thread cutting cam 7 to rotate by a corresponding angle, the transmission pin shaft 6-1 is in tangent fit with the periphery of the thread cutting cam 7, and the position of the thread cutting crank shaft 4 is fixed relative to the casing, so that the thread cutting cam 7 can drive the thread cutting crank connecting rod 6 to rotate around the central axis of the thread cutting crank shaft 4 by utilizing the irregular circle driving surface of the thread cutting cam 7 when rotating, and then the thread cutting assembly 1 is driven to swing around the thread cutting crank shaft 4 by the transmission belts of the thread cutting crank shaft 4 and the thread cutting auxiliary crank 3, so that the thread cutting function is realized.
It should be noted that, in the process that the stepping motor 8 drives the trimming cam 7 to rotate, when the transmission pin shaft 6-1 is in tangential fit with the concentric circumferential surface of the trimming cam 7, the transmission pin shaft 6-1 and the trimming crank connecting rod 6 do not swing, and when the transmission pin shaft 6-1 is in tangential fit with the irregular circular driving surface of the trimming cam 7, the irregular circular driving surface of the trimming cam 7 can drive the transmission pin shaft 6-1 and the trimming crank connecting rod 6 to rotate around the central axis of the trimming crank shaft 4.
Optionally, a first reset torsion spring 5 may be sleeved at a second end of the trimming crankshaft 4, that is, at an end close to the trimming crank connecting rod 6, one end of the first reset torsion spring 5 is clamped on the trimming crank connecting rod 6, and the other end is fixed on the housing; the position of the trimming crankshaft 4 can be fixed relative to the shell through the first reset torsion spring 5, during trimming, the stepping motor 8 drives the trimming crank connecting rod 6 to rotate, so that the first reset torsion spring 5 is twisted, and after trimming, the trimming crank connecting rod 6 can reset under the elastic action of the first reset torsion spring 5, so that the trimming device is simple and convenient. Preferably, the end of the first reset torsion spring 5 clamped on the trimming crank connecting rod 6 is Z-shaped, so that the clamping is firm and reliable, and the first reset torsion spring 5 is effectively prevented from moving.
On the basis of the above embodiments, in order to make the connection between the trimming crankshaft 4 and the trimming crank connecting rod 6 firm and reliable, a clamping plane for positioning can be machined in the circumferential direction of the second end of the trimming crankshaft 4, and meanwhile, a clamping hole matched with the second end of the trimming crankshaft 4 and a screw hole communicated with the clamping hole are arranged at the first end of the trimming crank connecting rod 6, and the screw hole is perpendicular to the positioning plane of the clamping hole.
Referring to fig. 5 to 7, fig. 5 is a schematic structural view of a feeding cam according to an embodiment of the present invention; fig. 6 is a schematic structural diagram of a feeding link according to an embodiment of the present invention; fig. 7 is a schematic structural diagram of a specific embodiment of the first and second reset torsion springs provided by the present invention.
On the basis of the above embodiments, in order to further simplify the structure and reduce the cost, the thread trimming function and the needle pitch adjusting function of the sewing machine can be controlled by the same stepping motor 8, specifically, the thread trimming needle pitch control device provided by the utility model further comprises a feeding cam 9, a feeding link 10, a feeding link shaft 11 and a feeding assembly 12, the stepping motor 8 has two coaxial and oppositely extending output shafts, the two output shafts are respectively marked as a first output shaft and a second output shaft, the thread trimming cam 7 can be fixed on the first output shaft, the feeding cam 9 can be fixed on the second output shaft, the periphery of the feeding cam 9 has a concentric circumference surface and an eccentric driving surface, the feeding link shaft 11 is parallel to the feeding main shaft 14 and the position thereof is fixed relative to the machine shell, the first end of the feeding link shaft 11 is fixed on the feeding assembly 12, the second end is fixedly connected with the first end of the feeding link 10, the second end of the feeding connecting rod 10 is provided with a transmission rotating shaft 10-1, the transmission rotating shaft 10-1 is positioned on one side of the feeding cam 9 and is in tangential fit with the periphery of the feeding cam 9, and the stepping motor 8 can drive the feeding connecting rod shaft 11 to rotate around the central axis of the feeding cam 9 and the feeding connecting rod 10. In order to ensure smooth transmission and conveniently control the thread cutting operation, the feeding connecting rod 10 is preferably perpendicular to the feeding connecting rod shaft 11, and the transmission rotating shaft 10-1 is parallel to the feeding main shaft 14.
During cloth feeding, corresponding command signals are sent to the stepping motor 8, so that the second output shaft of the stepping motor 8 drives the feeding cam 9 to rotate by a corresponding angle, the transmission rotating shaft 10-1 is in tangent fit with the periphery of the feeding cam 9, and the position of the feeding connecting rod shaft 11 is fixed relative to the machine shell, so that the eccentric driving surface of the feeding cam 9 can drive the feeding connecting rod 10 to rotate around the central axis of the feeding connecting rod shaft 11 when rotating, the feeding component 12 is driven to swing through the transmission of the feeding connecting rod shaft 11, the second output shaft of the stepping motor 8 can rotate by different angles, different stitch pitches can be realized, and the functions of positive stitching and reverse stitching can be realized from negative stitch pitches to positive stitch pitches.
It should be noted that, in the process that the stepping motor 8 drives the feeding cam 9 to rotate, when the transmission rotating shaft 10-1 is in tangential fit with the concentric circumferential surface of the feeding cam 9, the transmission rotating shaft 10-1 and the feeding connecting rod 10 do not swing, and when the transmission rotating shaft 10-1 is in tangential fit with the eccentric driving surface of the feeding cam 9, the eccentric driving surface of the feeding cam 9 can drive the transmission rotating shaft 10-1 and the feeding connecting rod 10 to rotate around the central axis of the feeding connecting rod shaft 11.
In order to prevent the feeding operation and the trimming operation from colliding, the transmission rotating shaft 10-1 is required to be in contact with the concentric circumferential surface of the feeding cam 9 when the transmission pin shaft 6-1 is in tangent fit with the irregular circular driving surface of the trimming cam 7, and the transmission pin shaft 6-1 is required to be in contact with the concentric circumferential surface of the trimming cam 7 when the transmission rotating shaft 10-1 is in tangent fit with the eccentric driving surface of the feeding cam 9.
Preferably, the feeding cam 9 and the trimming cam 7 are arranged in a staggered manner, specifically, the trimming crank connecting rod 6 can be arranged below the trimming cam 7, and the feeding connecting rod 10 is arranged above the feeding cam 9, as shown in fig. 1; when needing the work feed, step motor 8 anticlockwise rotation drives the work feed subassembly through a series of transmissions and moves, and the different needle pitch sewing of can realizing different needle pitches can be rotated to the motor, and when needing the trimming, step motor 8 clockwise rotation drives trimming subassembly 1 through a series of transmissions and moves, can make pay-off operation and trimming operation go on alone, and control is simple and convenient.
Of course, also can establish trimming crank connecting rod 6 in trimming cam 7's top, be located pay-off connecting rod 10 simultaneously pay-off cam 9's below, when needs work feed, step motor 8 clockwise turning, when needing the trimming, step motor 8 anticlockwise turning is also within the utility model discloses a within the scope of protection.
Optionally, the outer circumference of the trimming cam 7 may specifically include a concentric circumferential surface of 2/5 and an irregular circle driving surface of 3/5, that is, 2/5 of the outer ring of the trimming cam 7 is a concentric circle, and 3/5 is an irregular circle; the outer circumference of the feeding cam 9 may specifically include a concentric circumferential surface of 3/4 and an eccentric driving surface of 1/4, that is, 3/4 of the outer ring of the feeding cam 9 is a concentric circle, 1/4 is an irregular circle, and the diameter of the eccentric driving surface is larger than that of the concentric circle. Of course, the specific structure of trimming cam 7 and pay-off cam 9 is not limited to this, can adjust according to actual conditions, as long as guarantee pay-off operation and trimming operation can go on alone and each other do not influence, all be in the utility model discloses a within the protection scope.
On the basis of the above embodiments, a second reset torsion spring 13 may be sleeved at the second end of the feeding link shaft 11, i.e. the end close to the feeding link 10, one end of the second reset torsion spring 13 is clamped on the feeding link 10, and the other end is fixed on the casing; the position of the feeding connecting rod shaft 11 can be fixed relative to the machine shell through the second reset torsion spring 13, during feeding operation, the stepping motor 8 drives the feeding connecting rod 10 to rotate, so that the second reset torsion spring 13 is twisted, and after the feeding operation is finished, the feeding connecting rod 10 can reset under the elastic action of the second reset torsion spring 13, so that the feeding machine is simple and convenient. Preferably, one end of the second reset torsion spring 13 clamped on the feeding connecting rod 10 is Z-shaped, so that clamping is firm and reliable, and the second reset torsion spring 13 is effectively prevented from being dislocated.
On the basis of each above-mentioned specific embodiment, the utility model provides a thread trimming needle pitch controlling means, firm in connection is reliable for making pay-off connecting rod axle 11 and pay-off connecting rod 10 and pay-off subassembly 12, specifically can all process out the joint plane that is used for the location in the both ends week of pay-off connecting rod axle 11, be equipped with the mounting hole that matches with the first end of pay-off connecting rod axle 11 on the pay-off subassembly 12 simultaneously, the first end of pay-off connecting rod 10 is equipped with the card hole that matches with the second end of pay-off connecting rod axle 11, during the assembly, the mounting hole that the first end of pay-off connecting rod axle 11 inserted on the pay-off subassembly 12 is fixed with holding screw, the second end of pay-off connecting rod axle 11 inserts in the card hole on the pay-off connecting rod.
Preferably, the two clamping planes on the feeding connecting rod shaft 11 are arranged in a staggered manner, so that a certain included angle is formed between the feeding component 12 and the feeding connecting rod 10, and the position deviation is not easy to occur during transmission.
The utility model provides a trimming gauge needle controlling means, trimming crank axle 4, trimming cam 7, pay-off cam 9 and pay-off connecting rod axle 11 specifically can adopt the 20Cr material, and central strength is high, and the surface is stand wear and tear, and trimming crank connecting rod 6 can choose for use 45 steel, and intensity is high, the resistance to deformation ability is strong, and first reset torsion spring 5 and second reset torsion spring 13 then can adopt the 65Mn material, and intensity is high and toughness and plasticity are good.
In addition to the above mentioned device for controlling the thread cutting stitch length, the present invention provides a sewing machine comprising the above mentioned device for controlling the thread cutting stitch length, and the structure of other parts of the sewing machine is referred to the prior art, which is not repeated herein.
In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the designated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
In addition, the embodiments in the specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant part can be referred to the method part for description.
The sewing machine and the thread trimming gauge needle control device thereof provided by the utility model are introduced in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (10)
1. A trimming needle pitch control device of a sewing machine is characterized by comprising a trimming auxiliary crank (3), a trimming crank shaft (4), a trimming crank connecting rod (6), a trimming cam (7) and a stepping motor (8), wherein the trimming auxiliary crank (3) is fixedly connected with a knife rest connecting rod (2) of a trimming assembly (1), a first end of the trimming crank shaft (4) is fixedly connected with the trimming auxiliary crank (3), a second end of the trimming crank connecting rod is fixedly connected with a first end of the trimming crank connecting rod (6), a transmission pin shaft (6-1) is fixedly arranged at a second end of the trimming crank connecting rod (6), the trimming cam (7) is fixed on an output shaft of the stepping motor (8), the periphery of the trimming cam (7) is provided with a concentric and irregular circular driving surface of a circumferential surface, the transmission pin shaft (6-1) is positioned on one side of the trimming cam (7) and is in tangent fit with the periphery of the trimming cam (7), the position of the trimming crankshaft (4) is fixed relative to the shell, and the stepping motor (8) can drive the trimming crankshaft (4) to rotate around the central axis through the trimming cam (7) and the trimming crank connecting rod (6).
2. The device for controlling the thread cutting pitch of a sewing machine according to claim 1, wherein the output shafts of the thread cutting crank shaft (4) and the stepping motor (8) are both parallel to a feeding main shaft (14), the thread cutting crank connecting rod (6) is perpendicular to the thread cutting crank shaft (4), and the transmission pin shaft (6-1) is parallel to the feeding main shaft (14).
3. The trimming gauge control device of a sewing machine according to claim 1, wherein the second end of the trimming crank shaft (4) is sleeved with a first return torsion spring (5), one end of the first return torsion spring (5) is Z-shaped and is clamped on the trimming crank connecting rod (6), and the other end is fixed on the machine shell.
4. The trimming gauge control device of the sewing machine according to claim 3, wherein a clamping plane for positioning is processed in the circumferential direction of the second end of the trimming crank shaft (4), a clamping hole matched with the second end of the trimming crank shaft (4) is formed in the first end of the trimming crank connecting rod (6), and the second end of the trimming crank shaft (4) is inserted into the clamping hole and fixed through a screw.
5. The device for controlling the thread cutting pitch of a sewing machine according to any one of claims 1 to 4, further comprising a feed cam (9), a feed link (10), a feed link shaft (11), and a feed assembly (12), wherein the output shaft of the stepping motor (8) comprises a first output shaft and a second output shaft which are coaxial and extend in opposite directions, the thread cutting cam (7) is fixed on the first output shaft, the feed cam (9) is fixed on the second output shaft, the outer periphery of the feed cam (9) has a concentric circumferential surface and an eccentric driving surface, the feed link shaft (11) is parallel to the feed main shaft (14) and is fixed in position relative to the machine housing, a first end of the feed link shaft (11) is fixed on the feed assembly (12), and a second end is fixedly connected with the first end of the feed link (10), a second end of the feeding connecting rod (10) is provided with a transmission rotating shaft (10-1), the transmission rotating shaft (10-1) is positioned at one side of the feeding cam (9) and is in tangential fit with the periphery of the feeding cam (9), the stepping motor (8) can drive the feeding connecting rod shaft (11) to rotate around the central axis thereof through the feeding cam (9) and the feeding connecting rod (10), when the transmission pin shaft (6-1) is matched with the irregular round driving surface of the trimming cam (7) in a tangent way, the transmission rotating shaft (10-1) is contacted with the concentric circumference surface of the feeding cam (9), when the transmission rotating shaft (10-1) is in tangent fit with the eccentric driving surface of the feeding cam (9), the transmission pin shaft (6-1) is in contact with the concentric circumference surface of the trimming cam (7).
6. The device for controlling the stitch length of a thread cut in a sewing machine according to claim 5, wherein the thread cutting crank link (6) is located below the thread cutting cam (7), and the feed link (10) is located above the feed cam (9).
7. The thread cutting gauge control device of a sewing machine according to claim 6, wherein the outer periphery of the thread cutting cam (7) includes a concentric circumferential surface of 2/5 and an irregular circular driving surface of 3/5, and the outer periphery of the feed cam (9) includes a concentric circumferential surface of 3/4 and an eccentric driving surface of 1/4.
8. The thread trimming gauge needle control device of a sewing machine according to claim 5, wherein the second end of the feeding link shaft (11) is sleeved with a second reset torsion spring (13), one end of the second reset torsion spring (13) is Z-shaped and is clamped on the feeding link (10), and the other end is clamped on the machine shell.
9. The thread trimming gauge needle control device of a sewing machine according to claim 8, wherein clamping planes for positioning are processed on both ends of the feeding link shaft (11) in the circumferential direction, and the two clamping planes are arranged in a staggered manner.
10. A sewing machine characterized by comprising the thread cutting pitch control device of the sewing machine according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921817666.0U CN211079585U (en) | 2019-10-25 | 2019-10-25 | Sewing machine and thread trimming needle pitch control device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921817666.0U CN211079585U (en) | 2019-10-25 | 2019-10-25 | Sewing machine and thread trimming needle pitch control device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211079585U true CN211079585U (en) | 2020-07-24 |
Family
ID=71645221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921817666.0U Active CN211079585U (en) | 2019-10-25 | 2019-10-25 | Sewing machine and thread trimming needle pitch control device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211079585U (en) |
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2019
- 2019-10-25 CN CN201921817666.0U patent/CN211079585U/en active Active
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