CN114150446A - Sewing machine trimming and presser foot lifting device and sewing machine - Google Patents
Sewing machine trimming and presser foot lifting device and sewing machine Download PDFInfo
- Publication number
- CN114150446A CN114150446A CN202010929106.5A CN202010929106A CN114150446A CN 114150446 A CN114150446 A CN 114150446A CN 202010929106 A CN202010929106 A CN 202010929106A CN 114150446 A CN114150446 A CN 114150446A
- Authority
- CN
- China
- Prior art keywords
- trimming
- presser foot
- foot lifting
- sewing machine
- contour surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009966 trimming Methods 0.000 title claims abstract description 161
- 238000009958 sewing Methods 0.000 title claims abstract description 65
- 230000007246 mechanism Effects 0.000 claims abstract description 44
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 20
- 230000007704 transition Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/02—Presser-control devices
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention relates to the technical field of sewing machines, in particular to a thread trimming and presser foot lifting device of a sewing machine and the sewing machine comprising the thread trimming and presser foot lifting device. This trimming lifts presser foot device includes: the power piece is arranged on the machine head of the sewing machine shell; the driving cam is provided with a presser foot lifting contour surface and a trimming contour surface, and the power part is connected with the driving cam and drives the driving cam to rotate; the rear lever is rotatably supported on the machine head, one end of the rear lever is provided with a presser foot lifting roller matched with the contour surface of the presser foot lifting, and the other end of the rear lever is connected with the presser foot lifting mechanism; one end of the swing rod is rotatably supported on the machine head, and the other end of the swing rod is provided with a trimming roller matched with the trimming contour surface; and the upper end of the lower pull rod is hinged with the swing rod, and the lower end of the lower pull rod penetrates through a bottom plate of the sewing machine shell and is connected with the thread trimming mechanism. The power part is arranged on the machine head, so that the requirement of oil-free structure or oil sealing treatment on the bottom plate is avoided, and the power part has better applicability.
Description
Technical Field
The invention relates to the technical field of sewing machines, in particular to a thread trimming and presser foot lifting device of a sewing machine and the sewing machine.
Background
At present, a sewing machine is provided with a structure that a stepping motor arranged below a bottom plate of a machine shell drives a thread trimming mechanism to realize thread trimming, and the working angles of motors except for thread trimming are used for pushing a presser foot lifting ejector rod to realize that the presser foot is lifted except for thread trimming. According to the thread trimming presser foot lifting structure, the motor is arranged below the bottom plate and needs to be close to the thread trimming mechanism, so that the bottom plate is required to be in an oil-free structure or oil sealing treatment, the use of the thread trimming presser foot lifting structure has certain limitation, and the applicability is not good enough.
Disclosure of Invention
The invention aims to provide a thread cutting and presser foot lifting device of a sewing machine, which has good applicability and overcomes the defects in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a thread trimming and presser foot lifting device of a sewing machine comprises: the power piece is arranged on the machine head of the sewing machine shell; the driving cam is provided with a presser foot lifting contour surface and a trimming contour surface, and the power part is connected with the driving cam and drives the driving cam to rotate; the rear lever is rotatably supported on the machine head, one end of the rear lever is provided with a presser foot lifting roller matched with the contour surface of the presser foot lifting, and the other end of the rear lever is connected with the presser foot lifting mechanism; one end of the swing rod is rotatably supported on the machine head, and the other end of the swing rod is provided with a trimming roller matched with the trimming contour surface; and the upper end of the lower pull rod is hinged with the swing rod, and the lower end of the lower pull rod penetrates through a bottom plate of the sewing machine shell and is connected with the thread trimming mechanism.
Preferably, the presser foot lifting contour surface comprises a base circle section and a presser foot lifting section, the base circle section, the presser foot lifting section and the shear line contour surface are sequentially connected along the circumferential direction of the driving cam, the base circle section is an arc section concentrically arranged with the rotation center of the driving cam, the distance between the presser foot lifting section and the rotation center of the driving cam is gradually increased, and the shear line contour surface is a plane extending towards the inside of the driving cam.
Preferably, the wire cutting device further comprises a lever, the lever is rotatably supported on the bottom plate, one end of the lever is hinged with the lower end of the lower pull rod, and the other end of the lever is hinged with the wire cutting mechanism.
Preferably, the thread trimming mechanism comprises a thread trimming shaft, a spring sleeved on the thread trimming shaft, and a rear crank and a thread trimming crank which are fixedly arranged at two ends of the thread trimming shaft respectively, the rear crank is hinged to the lever, the thread trimming crank is connected with the thread trimming assembly, and two ends of the spring are abutted to the bottom plate and the thread trimming crank respectively.
Preferably, the thread trimming assembly comprises a connecting rod, a tool rest, a movable tool arranged on the tool rest and a fixed tool arranged on the bottom plate, one end of the connecting rod is hinged with the thread trimming crank, and the other end of the connecting rod is hinged with the tool rest.
Preferably, the lower shaft is rotatably supported on the base plate, the lower shaft is fixedly provided with a reset cam, the reset cam is provided with a reset contour surface, the lever is provided with a reset part matched with the reset contour surface, and when the trimming roller moves to the tail end of the trimming line along the trimming contour surface of the driving cam, the reset part moves to the outer peripheral side of the reset contour surface to a position opposite to the reset contour surface at intervals.
Preferably, the power part is provided with a rotating shaft, the driving cam is arranged on the rotating shaft, and the swing rod is rotatably sleeved on the rotating shaft.
Preferably, the presser foot lifting mechanism comprises a pull rod and a front lever, the front lever is rotatably supported on the machine head, one end of the pull rod is hinged with the rear lever, the other end of the pull rod is hinged with one end of the front lever, and the other end of the front lever is connected with the presser foot lifting assembly.
Preferably, the presser foot lifting assembly comprises a pulling plate, a pressure rod guide frame and a pressure rod provided with a presser foot, the pressure rod guide frame is fixedly arranged on the pressure rod, one end of the pulling plate is hinged with the front lever, and the other end of the pulling plate is connected with the pressure rod guide frame.
A sewing machine comprises the thread trimming and presser foot lifting device of the sewing machine.
Compared with the prior art, the invention has the remarkable progress that:
the power part is arranged on the machine head of the sewing machine shell, the driving cam is driven to rotate by the power part, the presser foot lifting mechanism is driven to perform the presser foot lifting action through the presser foot lifting contour surface on the driving cam, and the thread cutting mechanism is driven to perform the thread cutting action through the thread cutting contour surface on the driving cam, so that the presser foot lifting and thread cutting functions are realized.
Drawings
FIG. 1 is a schematic view showing a thread trimming and presser foot lifting device of a sewing machine according to an embodiment of the present invention mounted on a sewing machine housing.
Fig. 2 is a schematic structural view of a thread trimming and presser foot lifting device of the sewing machine according to the embodiment of the invention.
Fig. 3 is a schematic structural view of another view angle of the thread trimming and presser foot lifting device of the sewing machine according to the embodiment of the invention.
Fig. 4 is a schematic structural view of a driving cam in the thread trimming and presser foot lifting device of the sewing machine according to the embodiment of the invention.
Fig. 5 is a schematic structural view of a reset cam in the thread trimming and presser foot lifting device of the sewing machine according to the embodiment of the invention.
Wherein the reference numerals are as follows:
1. case 101, aircraft nose
102. Bottom plate 2, power part
200. Rotating shaft 201 and support
3. Drive cam 301, lift presser foot profile
301a, base circle section 301b, lift presser foot section
302. Line-cutting contour surface 303 and transition contour surface
4. Rear lever 401, lift presser foot roller
5. Swing rod 501 and trimming roller
6. Lower pull rod 7, lever
700. Reset part 701 and shaft position screw
702. Support 8, shear-line axle
9. Spring 10, rear crank
11. Trimming crank 12, connecting rod
13. Knife rest 14, moving knife
15. Stationary knife 16, trimming pull rod
17. Lower shaft 18 and reset cam
181. Reset profile surface 19, pull rod
20. Front lever 21, pulling plate
22. Pressure bar guide frame 23 and pressure bar
24. Pressure foot 25, needle board
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1 to 5, an embodiment of a thread trimming and presser foot lifting device of a sewing machine of the present invention is provided. The thread cutting and presser foot lifting device of the sewing machine of the embodiment is arranged in a machine shell 1 of the sewing machine and is used for realizing the thread cutting function and the presser foot lifting function in the sewing process of the sewing machine. The sewing machine cabinet 1 includes a head 101 and a bed plate 102, and the head 101 is provided above the bed plate 102.
Referring to fig. 1, 2 and 3, the thread trimming and presser foot lifting device of the sewing machine of the present embodiment includes a power member 2, a driving cam 3, a rear lever 4, a presser foot lifting mechanism, a swing link 5, a lower pull rod 6 and a thread trimming mechanism.
The power part 2 is fixedly installed on a machine head 101 of the sewing machine shell 1 through a support 201, the power part 2 is connected with the driving cam 3, the power part 2 is provided with a rotating shaft 200, the rotating shaft 200 outputs a rotating driving force, the driving cam 3 is installed on the rotating shaft 200 of the power part 2 and is relatively fixed with the rotating shaft 200, and the rotation of the rotating shaft 200 of the power part 2 drives the driving cam 3 to rotate around the axis of the rotating shaft 200 of the power part 2. The angle of the power part 2 driving the driving cam 3 to rotate is controllable, and preferably, the power part 2 can be a stepping motor or a servo motor, so that the accurate control of the rotation angle of the driving cam 3 can be realized.
The driving cam 3 has a raised and pressed contour surface 301 and a trimming contour surface 302, and preferably, the raised and pressed contour surface 301 and the trimming contour surface 302 are both located on the outer periphery of the driving cam 3.
The rear lever 4 is rotatably supported on the head 101, and preferably, the middle portion of the rear lever 4 is mounted on the head 101 through a hinge pin, and the rear lever 4 can swing up and down around the axis of the hinge pin, which is parallel to the axis of the rotating shaft 200 of the power member 2. One end of the rear lever 4 is provided with a presser foot lifting roller 401, and the other end of the rear lever 4 is connected with a presser foot lifting mechanism. The presser foot lifting roller 401 is matched with the presser foot lifting contour surface 301 of the driving cam 3, when the driving cam 3 is driven to rotate by the power part 2, the presser foot lifting contour surface 301 of the driving cam 3 rotates around the axis of the rotating shaft 200 of the power part 2, the rear lever 4 can be driven to swing through the action of the presser foot lifting contour surface 301 on the presser foot lifting roller 401, the swinging of the rear lever 4 drives the presser foot lifting mechanism to move, and the presser foot lifting action is executed.
One end of the swing link 5 is rotatably supported on the machine head 101, preferably, one end of the swing link 5 can be rotatably sleeved on the rotating shaft 200 of the power member 2, so that the swing link 5 can rotate around the axis of the rotating shaft 200 of the power member 2, and the axial position of the swing link 5 on the rotating shaft 200 is fixed, thereby realizing the rotary support of the swing link 5 on the machine head 101. In this embodiment, referring to fig. 3, the rotating shaft 200 of the power member 2 passes through the support 201 and then is connected to the driving cam 3, and the swing link 5 is located between the driving cam 3 and the support 201. The other end of the swing rod 5 is provided with a trimming roller 501, the trimming roller 501 is matched with the trimming contour surface 302 of the driving cam 3, when the driving cam 3 is driven by the power part 2 to rotate, the trimming contour surface 302 of the driving cam 3 rotates around the axis of the rotating shaft 200 of the power part 2, and the swing rod 5 can be driven to rotate through the action of the trimming contour surface 302 on the trimming roller 501. The upper end of the lower pull rod 6 is hinged with the swing rod 5, and the lower end of the lower pull rod 6 penetrates through a bottom plate 102 of the sewing machine shell 1 and is connected with a thread trimming mechanism arranged below the bottom plate 102. When the swing rod 5 rotates due to the fact that the trimming roller 501 is driven by the trimming contour surface 302 of the driving cam 3, the lower pull rod 6 is pulled to be lifted by the rotation of the swing rod 5, the lifting action of the lower pull rod 6 drives the trimming mechanism to move, and trimming action is executed.
The sewing machine thread trimming and presser foot lifting device of the embodiment arranges the power part 2 on the machine head 101 of the sewing machine shell 1, the power part 2 drives the driving cam 3 to rotate, the presser foot lifting mechanism is driven to carry out the presser foot lifting action through the presser foot lifting contour surface 301 on the driving cam 3, the thread trimming mechanism is driven to carry out the thread trimming action through the thread trimming contour surface 302 on the driving cam 3, the functions of presser foot lifting and thread trimming are realized, and the requirement that an oil-free structure or oil sealing treatment must be carried out on the bottom plate 102 of the sewing machine shell 1 due to the installation of the power part 2 is avoided because the power part 2 is arranged on the machine head 101 of the sewing machine shell 1, so that the sewing machine thread trimming and presser foot lifting device of the embodiment has better applicability.
In this embodiment, in the process that the rotating shaft 200 of the power member 2 drives the driving cam 3 to rotate, when the pressure foot lifting contour surface 301 of the driving cam 3 acts on the pressure foot lifting roller 401 to drive the rear lever 4 to swing and drive the pressure foot lifting mechanism to execute the pressure foot lifting action, the trimming contour surface 302 of the driving cam 3 does not act on the trimming roller 501, and the trimming mechanism executes the idle stroke; when the trimming contour surface 302 of the driving cam 3 acts on the trimming roller 501 to drive the swing rod 5 to rotate so as to pull the lower pull rod 6 to lift and drive the trimming mechanism to execute trimming, the presser foot lifting contour surface 301 of the driving cam 3 does not act on the presser foot lifting roller 401, and the presser foot lifting mechanism executes idle stroke. Thereby ensuring that the presser foot lifting action and the thread trimming action do not interfere with each other.
Preferably, referring to fig. 4, in the present embodiment, the presser foot lifting contour surface 301 of the driving cam 3 includes a base circle segment 301a and a presser foot lifting segment 301b, and the base circle segment 301a, the presser foot lifting segment 301b and the trimming contour surface 302 are sequentially connected in the circumferential direction of the driving cam 3. The base circle segment 301a is a circular arc segment concentrically disposed with the rotation center of the driving cam 3 (i.e., the axis of the rotating shaft 200 of the power element 2). When the presser foot roller 401 on the rear lever 4 moves along the base circle section 301a, the presser foot lifting contour surface 301 of the drive cam 3 does not act on the presser foot lifting roller 401, and the presser foot lifting mechanism performs an idle stroke. The distance between the presser foot lifting section 301b and the rotation center of the driving cam 3 is gradually increased, the highest point of the presser foot lifting section 301b relative to the rotation center of the driving cam 3 is a maximum presser foot lifting height point, and when the presser foot roller 401 on the rear lever 4 moves to the highest point along the presser foot lifting section 301b, the presser foot lifting mechanism is driven to perform presser foot lifting action and gradually lift the presser foot height to the maximum presser foot lifting height. The trimming contour surface 302 is a plane extending toward the inside of the drive cam 3, and the highest point of the trimming contour surface 302 meets the highest point of the base circle segment 301 a. The highest point of the trimming contour surface 302 is the trimming end of the trimming contour surface 302, and when the trimming roller 501 on the swing rod 5 moves to the trimming end along the trimming contour surface 302, the trimming mechanism is driven to execute and complete the trimming action. In this embodiment, when the power member 2 drives the driving cam 3 to rotate and the presser foot lifting roller 401 moves along the presser foot lifting section 301b of the presser foot lifting contour surface 301, the trimming contour surface 302 leaves the trimming roller 501 without acting on the trimming roller 501, so that the presser foot lifting mechanism performs the presser foot lifting action and the trimming mechanism performs the idle stroke; when the power member 2 drives the driving cam 3 to rotate reversely and the trimming roller 501 moves along the trimming contour surface 302, the presser foot lifting roller 401 moves along the base circle segment 301a of the presser foot contour surface 301, so that the trimming mechanism performs trimming and the presser foot lifting mechanism performs idle stroke. Preferably, the trimming contour surface 302 and the base circle segment 301a of the lifting and pressing contour surface 301 may be connected by a transition contour surface 303, so that the lifting and pressing contour surface 301, the trimming contour surface 302 and the transition contour surface 303 are sequentially connected in a circle along the circumferential direction of the driving cam 3 to form an outer circumferential surface of the driving cam 3. In this embodiment, the transition contour surface 303 is a plane perpendicular to the trimming contour surface 302.
Referring to fig. 1 and 2, the thread trimming and presser foot lifting device of the sewing machine of the present embodiment preferably further includes a lever 7, and the lever 7 is rotatably supported on the bottom plate 102 of the sewing machine housing 1. Preferably, the middle part of the lever 7 is mounted on a bracket 702 through an axis screw 701, and the lever 7 can swing up and down around the axis of the axis screw 701, the axis of the axis screw 701 is parallel to the axis of the rotating shaft 200 of the power member 2, and the bracket 702 is fixedly mounted on the bottom plate 102, thereby realizing that the lever 7 is rotatably supported on the bottom plate 102. One end of the lever 7 is hinged with the lower end of the lower pull rod 6, and the other end of the lever 7 is hinged with the thread trimming mechanism. When the trimming contour surface 302 of the driving cam 3 acts on the trimming roller 501 to drive the swing rod 5 to rotate and pull the lower pull rod 6 to lift, the lower pull rod 6 pulls the lever 7 to swing upwards around the fulcrum (namely the axial screw 701), and the upward swinging action of the lever 7 drives the trimming mechanism to move so as to execute the trimming action.
In this embodiment, referring to fig. 1 and 3, the thread cutting mechanism may preferably include a thread cutting spool 8, a spring 9, a rear crank 10, a thread cutting crank 11, and a thread cutting assembly. The thread cutting shaft 8 is rotatably supported on a bottom plate 102 of the sewing machine housing 1, and a rear crank 10 and a thread cutting crank 11 are respectively fixedly arranged at two ends of the thread cutting shaft 8. The rear crank 10 is hinged with the lever 7, preferably, the rear crank 10 and the lever 7 can be connected through a trimming pull rod 16, and two ends of the trimming pull rod 16 are respectively hinged with the rear crank 10 and the lever 7. The thread cutting crank 11 is connected with the thread cutting assembly. The thread cutting assembly can comprise a connecting rod 12, a tool rest 13, a movable tool 14 and a fixed tool 15, one end of the connecting rod 12 is hinged with the thread cutting crank 11, the other end of the connecting rod 12 is hinged with the tool rest 13, the tool rest 13 is rotatably supported on the base plate 102, the movable tool 14 is fixedly arranged on the tool rest 13, and the fixed tool 15 is fixedly arranged on the base plate 102. The spring 9 is sleeved on the thread cutting shaft 8, and two ends of the spring 9 are respectively abutted with the bottom plate 102 and the thread cutting crank 11. When the trimming contour surface 302 of the driving cam 3 acts on the trimming roller 501 to drive the swing rod 5 to rotate and to pull the lower pull rod 6 to lift and drive the lever 7 to swing upwards, the lever 7 drives the rear crank 10 to move and overcome the resistance of the spring 9, so that the rear crank 10 drives the trimming shaft 8 and the trimming crank 11 to rotate around the axis of the trimming shaft 8, the rotation of the trimming crank 11 drives the connecting rod 12 to move, and the movement of the connecting rod 12 drives the knife rest 13 to rotate and drives the movable knife 14 to move towards the fixed knife 15, thereby executing the trimming movement. After the thread cutting is finished, the power part 2 drives the driving cam 3 to rotate reversely, the thread cutting profile surface 302 does not act on the thread cutting roller 501 any more, at the moment, the thread cutting crank 11 rotates reversely to reset under the action of the elastic restoring force of the spring 9, and simultaneously drives the thread cutting assembly, the thread cutting shaft 8 and the rear crank 10 to move reversely to reset, so that the reset of the thread cutting mechanism is realized, and the lever 7, the lower pull rod 6 and the swing rod 5 are driven to move synchronously and reversely to reset.
Referring to fig. 3 and 5, preferably, the thread trimming and presser foot lifting device of the sewing machine of the embodiment further comprises a lower shaft 17, the lower shaft 17 is rotatably supported on the base plate 102, and the lower shaft 17 is driven to rotate during sewing of the sewing machine, and the thread trimming shaft 8 is parallel to the lower shaft 17. The lower shaft 17 is fixedly provided with a reset cam 18, the reset cam 18 has a reset contour surface 181, the reset contour surface 181 is located on the periphery of the reset cam 18, and the distance between the reset contour surface 181 and the rotation center of the reset cam 18 gradually increases. The lever 7 is provided with a reset portion 700 for engaging with the reset contoured surface 181. When the trimming roller 501 on the swing link 5 moves to the end of the trimming along the trimming contour surface 302 of the driving cam 3, that is, when the trimming contour surface 302 of the driving cam 3 acts on the trimming roller 501 to drive the swing link 5 to rotate and pull the lower pull rod 6 to lift and drive the lever 7 to swing upwards to drive the trimming mechanism to complete the trimming, the reset portion 700 on the lever 7 moves to the outer periphery of the reset contour surface 181 of the reset cam 18 to a position opposite to the reset contour surface 181 at an interval, and at the position, the reset portion 700 is close to the reset contour surface 181. At this time, under the normal condition, the trimming assembly, the trimming crank 11, the trimming shaft 8, the rear crank 10, the lever 7, the lower link 6 and the oscillating bar 5 realize automatic reset through the spring 9 sleeved on the trimming crank 11, and the reset portion 700 on the lever 7 also swings reversely along with the lever 7 to reset, after reset, the spacing distance between the reset portion 700 on the lever 7 and the reset contour surface 181 of the reset cam 18 becomes large, so that the reset contour surface 181 of the reset cam 18 does not contact and cooperate with the reset portion 700 on the lever 7 when the reset cam 18 rotates along with the lower shaft 17, and therefore, under the condition that normal reset is realized through the spring 9, the reset portion 700 on the lever 7 does not work. However, when the movable knife 14 and the fixed knife 15 in the cutting assembly cannot be separated from each other by the spring 9 due to wire clamping or other reasons, the cutting assembly, the cutting crank 11, the cutting bobbin 8, the rear crank 10, the lever 7, the lower pull rod 6 and the swing link 5 are not normally reset, at this time, the reset portion 700 on the lever 7 is still located at the position where the outer periphery of the reset contour surface 181 of the reset cam 18 is opposite to the reset contour surface 181 at a spacing and is adjacent to the reset contour surface 181, so that when the lower shaft 17 is driven to drive the reset cam 18 to rotate and the reset contour surface 181 rotates therewith, the reset contour surface 181 can contact and cooperate with the reset portion 700 on the lever 7 and push the reset portion 700 to reset the lever 7 in a reverse swing manner, the rear crank 10, the cutting bobbin 8, the cutting crank 11 and the cutting assembly are forcibly reset by the reverse swing of the lever 7, thereby forcibly separating the movable knife 14 from the fixed knife 15, meanwhile, the lower pull rod 6 and the swing rod 5 are driven to move reversely to reset, so that the next thread cutting action can be carried out smoothly.
The reset of the trimming mechanism after trimming is completed by the trimming presser foot lifting structure in the prior art is realized by the motor reversal driving, and the forced reset when the cutter clamping condition occurs to the trimming mechanism is realized by the motor reversal, so that the requirement on the torque of the motor is higher, and the risk that a needle hits a cutter can not be avoided when the motor with too large cutter resistance can not be pushed. The thread cutting and presser foot lifting device of the sewing machine of the embodiment is characterized in that the lower shaft 17 is provided with the reset cam 18, the lever 7 is provided with the reset part 700 matched with the reset contour surface 181 of the reset cam 18, the lower shaft 17 drives the reset part 700 of the reset contour surface 181 of the reset cam 18 to act on the lever 7 to realize forced reset, the torque requirement on the power part 2 is reduced, meanwhile, the thread cutting mechanism can be ensured to realize reset after finishing thread cutting action, and the needle collision caused by cutter clamping is avoided.
In this embodiment, referring to fig. 3, the presser foot lifting mechanism may preferably include a pull rod 19 and a front lever 20. The front lever 20 is rotatably supported on the head 101, and preferably, the middle portion of the front lever 20 is mounted on the head 101 through a hinge pin, and the front lever 20 can swing up and down around the axis of the hinge pin, which is parallel to the axis of the rotating shaft 200 of the power member 2. One end of a pull rod 19 is hinged with the rear lever 4, the other end of the pull rod 19 is hinged with one end of a front lever 20, and the other end of the front lever 20 is connected with a pressure foot lifting assembly. The presser foot lifting assembly can comprise a pull plate 21, a pressure rod guide frame 22 and a pressure rod 23, wherein a presser foot 24 is arranged at the lower end of the pressure rod 23 and is positioned above a needle plate 25, the needle plate 25 is arranged on a bottom plate 102 of the sewing machine shell 1, the pressure rod guide frame 22 is fixedly arranged at the upper end of the pressure rod 23, one end of the pull plate 21 is hinged with the front lever 20, and the other end of the pull plate 21 is connected with the pressure rod guide frame 22. When the rear lever 4 is driven to swing by the pressure foot lifting roller 401 acting on the rear lever 4 by the base circle section 301a of the pressure foot lifting contour surface 301 of the driving cam 3, the rear lever 4 drives the pull rod 19 to pull the front lever 20 to swing around the fulcrum of the front lever, the front lever 20 swings to drive the pull plate 21 to move, the pull plate 21 pulls the press rod guide frame 22 to lift, and therefore the press rod 23 and the pressure foot 24 are driven to lift, and the pressure foot lifting movement is executed.
Based on the above-mentioned sewing machine trimming lifts presser foot device, this embodiment still provides a sewing machine, and the sewing machine of this embodiment includes the above-mentioned sewing machine trimming of this embodiment and lifts presser foot device.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a presser foot device is lifted in sewing machine trimming which characterized in that includes:
the power piece (2) is arranged on a machine head (101) of the sewing machine shell (1);
the driving cam (3) is provided with a pressure foot lifting contour surface (301) and a trimming contour surface (302), and the power part (2) is connected with the driving cam (3) and drives the driving cam (3) to rotate;
the rear lever (4) is rotatably supported on the machine head (101), one end of the rear lever (4) is provided with a presser foot lifting roller (401) matched with the presser foot lifting contour surface (301), and the other end of the rear lever is connected with a presser foot lifting mechanism;
one end of the swing rod (5) is rotatably supported on the machine head (101), and the other end of the swing rod (5) is provided with a trimming roller (501) matched with the trimming contour surface (302); and
the upper end of the lower pull rod (6) is hinged with the swing rod (5), and the lower end of the lower pull rod (6) penetrates through a bottom plate (102) of the sewing machine shell (1) and is connected with the thread trimming mechanism.
2. The trimming and presser foot lifting device of a sewing machine according to claim 1, wherein the trimming and presser foot contour surface (301) comprises a base circle segment (301a) and a presser foot lifting segment (301b), the base circle segment (301a), the presser foot lifting segment (301b) and the trimming contour surface (302) are sequentially connected along the circumferential direction of the driving cam (3), the base circle segment (301a) is a circular arc segment concentrically arranged with the rotation center of the driving cam (3), the distance between the presser foot lifting segment (301b) and the rotation center of the driving cam (3) is gradually increased, and the trimming contour surface (302) is a plane extending towards the inside of the driving cam (3).
3. The thread trimming and presser foot lifting device of a sewing machine according to claim 1, further comprising a lever (7), wherein said lever (7) is rotatably supported on said base plate (102), one end of said lever (7) is hinged to the lower end of said lower link (6), and the other end is hinged to said thread trimming mechanism.
4. The trimming presser foot lifting device of sewing machine according to claim 3, wherein the trimming mechanism comprises a trimming shaft (8), a spring (9) sleeved on the trimming shaft (8), and a rear crank (10) and a trimming crank (11) respectively fixed at two ends of the trimming shaft (8), the rear crank (10) is hinged to the lever (7), the trimming crank (11) is connected to the trimming assembly, and two ends of the spring (9) are respectively abutted to the bottom plate (102) and the trimming crank (11).
5. The trimming and presser foot lifting device of a sewing machine according to claim 4, wherein the trimming assembly comprises a connecting rod (12), a knife rest (13), a movable knife (14) arranged on the knife rest (13) and a fixed knife (15) arranged on the base plate (102), one end of the connecting rod (12) is hinged with the trimming crank (11), and the other end is hinged with the knife rest (13).
6. The trimming and presser foot lifting device of a sewing machine according to claim 3, further comprising a lower shaft (17), wherein the lower shaft (17) is rotatably supported on the base plate (102), a reset cam (18) is fixedly arranged on the lower shaft (17), the reset cam (18) has a reset contour surface (181), a reset portion (700) for cooperating with the reset contour surface (181) is arranged on the lever (7), and when the trimming roller (501) moves to the end of trimming along the trimming contour surface (302) of the driving cam (3), the reset portion (700) moves to the outer peripheral side of the reset contour surface (181) to a position opposite to the reset contour surface (181) at a certain interval.
7. The trimming and presser foot lifting device of sewing machine according to claim 1, wherein said power member (2) has a rotating shaft (200), said driving cam (3) is mounted on said rotating shaft (200), and said swing link (5) is rotatably fitted over said rotating shaft (200).
8. The trimming and presser foot lifting device of sewing machine according to claim 1, wherein said presser foot lifting mechanism comprises a pull rod (19) and a front lever (20), said front lever (20) is rotatably supported on said machine head (101), one end of said pull rod (19) is hinged with said rear lever (4) and the other end is hinged with one end of said front lever (20), the other end of said front lever (20) is connected with a presser foot lifting assembly.
9. The trimming and presser foot lifting device of sewing machine according to claim 8, wherein the presser foot lifting assembly comprises a pull plate (21), a presser bar guide frame (22) and a presser bar (23) provided with a presser foot (24), the presser bar guide frame (22) is fixedly arranged on the presser bar (23), one end of the pull plate (21) is hinged with the front lever (20), and the other end is connected with the presser bar guide frame (22).
10. A sewing machine comprising the thread trimming and presser foot lifting device of the sewing machine according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010929106.5A CN114150446A (en) | 2020-09-07 | 2020-09-07 | Sewing machine trimming and presser foot lifting device and sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010929106.5A CN114150446A (en) | 2020-09-07 | 2020-09-07 | Sewing machine trimming and presser foot lifting device and sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114150446A true CN114150446A (en) | 2022-03-08 |
Family
ID=80460878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010929106.5A Pending CN114150446A (en) | 2020-09-07 | 2020-09-07 | Sewing machine trimming and presser foot lifting device and sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114150446A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023230847A1 (en) * | 2022-05-31 | 2023-12-07 | 安徽杰羽制鞋机械科技有限公司 | Stepping thread-cutting and presser foot-lifting device of sewing machine |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1458327A (en) * | 2002-05-14 | 2003-11-26 | 重机公司 | Sewing machine |
| CN1757812A (en) * | 2004-10-08 | 2006-04-12 | 重机公司 | Sewing machine |
| CN1757809A (en) * | 2004-10-08 | 2006-04-12 | 重机公司 | Sewing machine |
| CN106012323A (en) * | 2016-07-30 | 2016-10-12 | 浙江杜马缝纫机股份有限公司 | Driving device for automatic thread trimming and automatic presser foot lifting |
| CN205917425U (en) * | 2016-07-30 | 2017-02-01 | 浙江杜马缝纫机股份有限公司 | Automatic trimming and automatic drive arrangement who lifts presser foot |
| CN207452400U (en) * | 2017-10-31 | 2018-06-05 | 强信机械科技(莱州)有限公司 | Flat seaming machine trimming, loose ends and presser foot lifter action driver and flat seaming machine |
| CN209722464U (en) * | 2019-01-15 | 2019-12-03 | 浙江美机缝纫机有限公司 | A kind of thread-trimming lifter-presser foot mechanism and sewing machine |
-
2020
- 2020-09-07 CN CN202010929106.5A patent/CN114150446A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1458327A (en) * | 2002-05-14 | 2003-11-26 | 重机公司 | Sewing machine |
| CN1757812A (en) * | 2004-10-08 | 2006-04-12 | 重机公司 | Sewing machine |
| CN1757809A (en) * | 2004-10-08 | 2006-04-12 | 重机公司 | Sewing machine |
| CN106012323A (en) * | 2016-07-30 | 2016-10-12 | 浙江杜马缝纫机股份有限公司 | Driving device for automatic thread trimming and automatic presser foot lifting |
| CN205917425U (en) * | 2016-07-30 | 2017-02-01 | 浙江杜马缝纫机股份有限公司 | Automatic trimming and automatic drive arrangement who lifts presser foot |
| CN207452400U (en) * | 2017-10-31 | 2018-06-05 | 强信机械科技(莱州)有限公司 | Flat seaming machine trimming, loose ends and presser foot lifter action driver and flat seaming machine |
| CN209722464U (en) * | 2019-01-15 | 2019-12-03 | 浙江美机缝纫机有限公司 | A kind of thread-trimming lifter-presser foot mechanism and sewing machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023230847A1 (en) * | 2022-05-31 | 2023-12-07 | 安徽杰羽制鞋机械科技有限公司 | Stepping thread-cutting and presser foot-lifting device of sewing machine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110923967B (en) | Sewing machine trimming and thread loosening pressure foot lifting device and sewing machine | |
| CN110983644A (en) | Sewing machine trimming and thread loosening pressure foot lifting and pressure foot pressure adjusting device and sewing machine | |
| CN114150446A (en) | Sewing machine trimming and presser foot lifting device and sewing machine | |
| CN108049043B (en) | Independent hole carving device of embroidery machine | |
| CN111501223B (en) | Cam wheel | |
| CN208183275U (en) | A kind of sewing machine | |
| CN111501214B (en) | Sewing machine thread trimming, presser foot lifting and needle distance adjusting device and sewing machine | |
| CN105908400A (en) | Sewing machine and function driving device of sewing machine | |
| CN214655668U (en) | Sewing machine and thread trimming device thereof | |
| CN112064222B (en) | Sewing machine | |
| CN217869413U (en) | Thread trimming and presser foot lifting mechanism for flat seaming machine | |
| CN115125679B (en) | Automatic chain sewing machine of cutting line | |
| CN113022189A (en) | Binding and punching machine for ancient book imitating Chinese language and literature and use method thereof | |
| CN217324535U (en) | Lift presser foot and trimming device and sewing machine | |
| CN107953182B (en) | Casting floating rotating mechanism with adjustable | |
| CN106222893B (en) | A pinch roller subassembly and sewing machine for sewing machine | |
| CN217459840U (en) | Sewing machine | |
| CN219239968U (en) | Overedger with thread cutting and presser foot lifting mechanisms | |
| CN110699876A (en) | Short thread end thread cutting mechanism of sewing machine | |
| CN214655673U (en) | Sewing machine with compound adjustment mechanism | |
| CN115247321B (en) | Sewing machine cuts line and lifts presser foot and line tension mechanism | |
| CN217298243U (en) | Thread trimming mechanism of sewing machine and sewing machine | |
| CN220149813U (en) | Stepping driving mechanism suitable for sewing machine | |
| CN213681182U (en) | Novel trimming and presser foot lifting self-separation device of overedger and overedger | |
| CN220887935U (en) | Stepping presser foot lifting and thread cutting mechanism of button sewing machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220308 |