CN212103240U - Automatic thread trimming and bobbin locking device in sewing machine - Google Patents
Automatic thread trimming and bobbin locking device in sewing machine Download PDFInfo
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- CN212103240U CN212103240U CN202020542130.9U CN202020542130U CN212103240U CN 212103240 U CN212103240 U CN 212103240U CN 202020542130 U CN202020542130 U CN 202020542130U CN 212103240 U CN212103240 U CN 212103240U
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Abstract
The utility model provides an automatic trimming and lock shuttle peg device among sewing machine belongs to sewing equipment technical field. The automatic thread trimming device solves the technical problems that thread ends are easy to enter the interior of a shuttle peg when the existing sewing machine automatically trims threads. The sewing machine comprises a bobbin and a lower shaft, the automatic thread trimming and bobbin locking device comprises a tool rest assembly, a thread trimming connecting rod, a mounting column and a transmission connecting rod fixedly connected to one end of the thread trimming connecting rod, a mandril capable of swinging is arranged on the mounting column, a lock head is fixedly arranged at one end of the mandril, and the mandril penetrates through the transmission connecting rod and swings of the transmission connecting rod to drive the lock head on the mandril to move towards the bobbin. The utility model discloses in actuating mechanism drive ejector pin and tapered end through the trimming action to the shuttle peg formation locking, can realize both synchronous motion, the action is accurate, and it need not set up the driving source of drive tapered end action alone again, and overall structure is simple compact, convenient assembling, and is with low costs, and the operation is reliable and stable.
Description
Technical Field
The utility model belongs to the technical field of sewing machine, a automatic trimming and lock shuttle peg device among sewing machine is related to.
Background
A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. When the sewing machine works, a thread needs to be wound on the shuttle peg and placed in the shuttle shell, and the thread on the shuttle peg is used as a bottom thread and matched with an upper thread to realize sewing; after sewing, thread cutting is needed. The sewing machine that uses in the industry at present all basically has automatic thread trimming device to improve degree of automation and work efficiency, current sewing machine is at the thread trimming in-process, in order to guarantee to cut off the line, often the thread trimming speed is very fast, the shuttle peg is in the thread trimming back because the inertial action takes place to rotate, can pull back the bottom thread end again in the shuttle peg usually, lead to the needle-lifting area not to go up the line when sewing next time, influence the sewing quality, bring the trouble for the workman, efficiency reduction.
The Chinese patent (publication number: CN 209039727U; published 2019-06-28) discloses a shuttle peg locking device, which comprises a driving source, a transmission rod component, a connecting rod, a swinging rod and a rotating shuttle, wherein the output end of the driving source is connected with the transmission rod component hinged on a shell of a sewing machine, one end of the connecting rod is hinged with the end part of the transmission rod component, the other end of the connecting rod is connected with the swinging rod hinged on the shell of the sewing machine, one end of the swinging rod is provided with a locking head, and the other end of the swinging rod is connected with an elastic component capable of driving the locking head to be attached.
Although the bobbin locking device is specially arranged in the patent literature and used for placing the bobbin after thread cutting to continue to rotate due to inertia, the device needs to be separately provided with a driving source and a complex transmission structure, the requirement on the precision of assembly is high, and in addition, the synchronous consistency of the action of the driving source and the thread cutting action is difficult to ensure during action, so that the driving source and the thread cutting action interfere with each other, and the use effect is influenced.
Disclosure of Invention
The utility model discloses to the above-mentioned problem that prior art exists, provide an automatic trimming and lock shuttle peg device among sewing machine, the utility model aims to solve the technical problem that: how to effectively prevent the shuttle peg from bringing the thread end back to the interior of the shuttle peg when automatically cutting the thread and simultaneously ensure the accurate reliability of the action of locking the shuttle peg.
The purpose of the utility model can be realized by the following technical proposal:
an automatic thread trimming and bobbin locking device in a sewing machine comprises a bobbin and a lower shaft, wherein the automatic thread trimming and bobbin locking device comprises a tool rest assembly and a thread trimming connecting rod capable of driving a movable cutter and a fixed cutter in the tool rest assembly to form trimming motion, and the lower shaft can be connected with the thread trimming connecting rod and drives the thread trimming connecting rod to swing; the automatic thread trimming and bobbin locking device is characterized by further comprising a mounting column and a transmission connecting rod fixedly connected to one end of the thread trimming connecting rod, wherein a push rod capable of swinging is arranged on the mounting column, a lock head is fixedly arranged at one end of the push rod, the push rod penetrates through the transmission connecting rod, and the transmission connecting rod swings to drive the lock head on the push rod to move towards the bobbin.
The working principle is as follows: when a sewing action of the sewing machine is finished and a thread needs to be cut, the lower shaft can drive the thread cutting connecting rod to act through the transmission mechanism, the thread cutting connecting rod drives the movable cutter and the fixed cutter in the cutter rest assembly to form cutting motion, so that a thread is cut, meanwhile, the thread cutting connecting rod is driven to swing when swinging, the transmission connecting rod drives the ejector rod to act, the ejector rod swings around the mounting column, the lock head at the end part of the ejector rod moves towards the shuttle peg and abuts against the side surface of the shuttle peg, the lock head forms a lock on the shuttle peg to prevent the shuttle peg from continuously rotating, and therefore the phenomenon that the thread end is not fed when the next thread starts to be cut due to the fact that the shuttle peg carries the thread end back to the interior of the. After the thread cutting action is finished, the ejector rod and the lock head reset, and the shuttle peg can normally run. The actuating mechanism drive ejector pin and the tapered end through the trimming action form the locking to the shuttle peg among this technical scheme, can realize both synchronous motion, and the action is accurate, and it need not set up the driving source that drives the tapered end action alone again, and overall structure is simple compact, convenient assembling, and is with low costs, and the operation is reliable and stable.
In the automatic thread trimming and bobbin locking device in the sewing machine, the mounting column is cylindrical and is fixedly arranged on a shell of the sewing machine, the mounting column is sleeved with the mounting support capable of rotating, one end of the ejector rod is provided with the bent hook part bent towards one side, the lock head is fixedly arranged on the bent hook part, and the other end of the ejector rod is fixedly connected to the mounting support. Thus, the ejector rod can rotate conveniently and drive the lock head to lock the shuttle peg.
In the automatic thread trimming and bobbin locking device in the sewing machine, the mounting column is also sleeved with a reset torsion spring, and one end of the reset torsion spring acts on the mounting column or a machine shell of the sewing machine; the other end of the reset torsion spring acts on the mounting bracket. Further, a clamp spring is arranged on the mounting column close to the upper end and located on the upper side of the mounting support and used for limiting the mounting support, a reset torsion spring is located between the lower side of the mounting support and the shell of the sewing machine, a connecting portion is arranged on one side of the outer peripheral surface of the mounting support, a mounting hole is formed in the connecting portion, and the end portion of the ejector rod is inserted into the mounting hole and fixed through a locking screw. The lock head can be separated from the shuttle peg when the thread trimming mechanism resets through the torsion of the reset torsion spring, so that the shuttle peg can normally run when the sewing machine sews.
In the automatic thread trimming and bobbin locking device in the sewing machine, the transmission connecting rod is in a strip plate shape with the middle bent, one end of the transmission connecting rod is provided with a waist-shaped hole along the length direction of the transmission connecting rod, the other end of the transmission connecting rod is provided with a circular hole, the ejector rod penetrates through the waist-shaped hole, and a shaft position screw in threaded connection with the end part of one end of the thread trimming connecting rod is inserted into the circular hole. The ejector rod is in sliding fit in the waist-shaped hole, and when the thread trimming mechanism acts, the transmission connecting rod pulls the ejector rod to rotate around the mounting column, so that the lock head is leaned against the side edge of the shuttle peg, friction limiting is formed, and the shuttle peg is prevented from rotating by inertia.
In the automatic thread trimming and bobbin locking device in the sewing machine, a driving source and a thread trimming driving shaft capable of rotating are arranged in a shell of the sewing machine, the output end of the driving source is connected with a thread trimming shaft, and a thread trimming cam crank assembly is fixedly arranged on the thread trimming shaft; a driving cam is fixedly arranged on the lower shaft, and the driving source can drive the thread cutting shaft to axially move and enable the thread cutting cam crank assembly to be in clutch with the driving cam; one end of the trimming drive shaft is movably connected with the trimming cam crank assembly, the other end of the trimming drive shaft is fixedly connected with the trimming crank, one end of the trimming connecting rod is rotatably connected with the trimming crank, and the other end of the trimming connecting rod is rotatably connected with the transmission connecting rod. Under the switching-on of a driving source, a tangent cam crank assembly on a thread cutting shaft is pushed to axially displace, the tangent cam crank assembly is rotated after being contacted with a driving cam on a lower shaft, then a thread cutting driving shaft is driven to rotate, then a thread cutting crank is driven to swing, finally, a tool rest assembly is driven to complete thread cutting action through a thread cutting connecting rod, and meanwhile, the thread cutting connecting rod pulls an ejector rod to swing through a transmission connecting rod to realize locking of the bobbin.
In the automatic thread trimming and bobbin locking device in the sewing machine, a compression spring is sleeved on one end of the thread trimming shaft, and two ends of the compression spring respectively act on the thread trimming shaft and a shell of the sewing machine; the thread cutting driving shaft is sleeved with a knife rest torsion spring, one end of the knife rest torsion spring is connected with the thread cutting crank, and the other end of the knife rest torsion spring is connected with a shell of the sewing machine. The compression spring plays a role in resetting the wire cutting shaft when the driving source is powered off; the knife rest torsion spring is used for resetting the knife rest component.
In the automatic thread trimming and bobbin locking device in the sewing machine, the driving source is an electromagnet, a cylinder or a motor.
In the automatic thread trimming and bobbin locking device in the sewing machine, the lock head is made of rubber or plastic. The lock head is made of non-metal materials, has certain flexibility, and avoids the shuttle peg from deforming due to direct rigid collision with the shuttle peg.
The utility model discloses in actuating mechanism drive ejector pin and tapered end through the trimming action to the shuttle peg formation locking, can realize both synchronous motion, the action is accurate, and it need not set up the driving source of drive tapered end action alone again, and overall structure is simple compact, convenient assembling, and is with low costs, and the operation is reliable and stable.
Drawings
Fig. 1 is a schematic perspective view of the automatic thread trimming and bobbin locking device.
Fig. 2 is a schematic perspective view of a transmission link in the automatic thread trimming and bobbin locking device according to the present invention.
Fig. 3 is a first schematic structural diagram of the automatic thread trimming and bobbin locking device before bobbin locking.
Fig. 4 is a second schematic structural view of the automatic thread trimming and bobbin locking device before bobbin locking.
Fig. 5 is a first schematic structural view of the automatic thread trimming and bobbin locking device after the bobbin is locked.
Fig. 6 is a second schematic structural view of the automatic thread trimming and bobbin locking device after the bobbin is locked.
In the figure, 1, a bobbin; 2. a lower shaft; 3. a tool holder assembly; 4. trimming connecting rods; 5. mounting a column; 6. a transmission connecting rod; 61. a kidney-shaped hole; 62. a circular hole; 7. a top rod; 71. a hook part; 8. a lock head; 9. mounting a bracket; 10. a return torsion spring; 11. an axial screw; 12. a drive source; 13. a thread trimming drive shaft; 14. a thread cutting shaft; 15. a tangent cam crank assembly; 16. a drive cam; 17. a thread cutting crank; 18. a compression spring; 19. a knife rest torsion spring.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
As shown in fig. 1, 3 and 5, the sewing machine includes a bobbin 1 and a lower shaft 2, the automatic thread trimming and bobbin locking device includes a knife rest assembly 3 and a thread trimming connecting rod 4 capable of driving a movable knife and a fixed knife in the knife rest assembly 3 to perform trimming movement, and the lower shaft 2 can be connected with the thread trimming connecting rod 4 and drive the thread trimming connecting rod 4 to swing; the automatic thread trimming and bobbin locking device further comprises a mounting column 5 and a transmission connecting rod 6 fixedly connected to one end of the thread trimming connecting rod 4, a mandril 7 capable of swinging is arranged on the mounting column 5, a lock 8 is fixedly arranged at one end of the mandril 7, and the mandril 7 penetrates through the transmission connecting rod 6 and the transmission connecting rod 6 swings to drive the lock 8 on the mandril 7 to move towards the bobbin 1. Further, the mounting column 5 is cylindrical and is fixedly arranged on a machine shell of the sewing machine, the mounting column 5 is sleeved with a rotatable mounting support 9, one end of the ejector rod 7 is provided with a bent hook part 71 bent towards one side, the lock head 8 is fixedly arranged on the bent hook part 71, and the other end of the ejector rod 7 is fixedly connected on the mounting support 9; a reset torsion spring 10 is also sleeved on the mounting column 5, and one end of the reset torsion spring 10 acts on the mounting column 5 or the shell of the sewing machine; the other end of the reset torsion spring 10 acts on the mounting bracket 9; be equipped with the jump ring near the upper end on the erection column 5, the jump ring is located the 9 upsides of installing support for spacing installing support 9, reset torsion spring 10 is located between 9 downsides of installing support and the casing of sewing machine, and 9 outer peripheral face one side of installing support have connecting portion, have the mounting hole on the connecting portion, and the tip of ejector pin 7 is inserted and is established in the mounting hole, and fixes through locking screw.
As shown in fig. 3 to 6, when a sewing operation of the sewing machine is completed and thread cutting is required, the lower shaft 2 can drive the thread cutting connecting rod 4 to move through the transmission mechanism, the thread cutting connecting rod 4 drives the movable knife and the fixed knife in the knife rest assembly 3 to perform cutting movement so as to cut off a thread, meanwhile, the thread cutting connecting rod 4 drives the transmission connecting rod 6 to swing when swinging, the transmission connecting rod 6 drives the ejector rod 7 to move, the ejector rod 7 swings around the mounting post 5, the lock 8 at the end part of the ejector rod 7 moves towards the bobbin 1 and abuts against the side surface of the bobbin 1, the lock 8 forms a lock on the bobbin 1 to prevent the bobbin 1 from continuing rotating, and therefore the phenomenon that the bobbin 1 cannot be threaded when the thread starts to be sewn next time due to inertia movement of the bobbin 1 is effectively prevented. After the thread cutting action is finished, the ejector rod 7 and the lock 8 reset, and the shuttle peg 1 can normally run. In this embodiment, the driving mechanism driving the ejector rod 7 and the lock 8 through the thread cutting action form a locking to the bobbin 1, so that the synchronous motion between the ejector rod and the bobbin can be realized, the action is accurate, the driving source 12 for driving the lock 8 to act is not required to be independently arranged, the whole structure is simple and compact, the assembly is convenient, the cost is low, and the operation is stable and reliable.
Referring to fig. 2, the transmission link 6 is in a shape of a strip plate with a bent middle portion, one end of the transmission link 6 is provided with a waist-shaped hole 61 along the length direction of the transmission link, the other end of the transmission link 6 is provided with a circular hole 62, the ejector rod 7 penetrates through the waist-shaped hole 61, and a shaft position screw 11 screwed to one end of the shear link 4 is inserted into the circular hole 62. The ejector rod 7 is in sliding fit in the waist-shaped hole 61, and when the thread trimming mechanism moves, the transmission connecting rod 6 pulls the ejector rod 7 to rotate around the mounting column 5, so that the lock 8 leans against the side edge of the shuttle peg 1, friction limiting is formed, and the shuttle peg 1 is prevented from rotating inertially.
As shown in fig. 1, 3 to 6, a driving source 12 and a thread cutting driving shaft 13 capable of rotating are arranged in a casing of the sewing machine, an output end of the driving source 12 is connected with a thread cutting shaft 14, and a thread cutting cam crank assembly 15 is fixedly arranged on the thread cutting shaft 14; a driving cam 16 is fixedly arranged on the lower shaft 2, and the driving source 12 can drive the cutting spool 14 to axially move and enable the tangent cam crank assembly 15 to be in clutch with the driving cam 16; one end of the trimming drive shaft 13 is movably connected with the trimming cam crank assembly 15, the other end is fixedly connected with the trimming crank 17, one end of the trimming connecting rod 4 is rotatably connected with the trimming crank 17, and the other end is rotatably connected with the transmission connecting rod 6; under the electrification of a driving source 12, a tangent cam crank assembly 15 on a thread cutting shaft 14 is pushed to axially displace, the tangent cam crank assembly 15 is rotated after being contacted with a driving cam 16 on a lower shaft 2, a thread cutting driving shaft 13 is driven to rotate, a thread cutting crank 17 is driven to swing, finally, a tool rest assembly 3 is driven by a thread cutting connecting rod 4 to complete thread cutting, and meanwhile, the thread cutting connecting rod 4 pulls an ejector rod 7 to swing through a transmission connecting rod 6 to realize the locking of the bobbin 1. Further, one end of the thread-cutting shaft 14 is sleeved with a compression spring 18, and two ends of the compression spring 18 respectively act on the thread-cutting shaft 14 and a shell of the sewing machine; a knife rest torsion spring 19 is sleeved outside the thread cutting driving shaft 13, one end of the knife rest torsion spring 19 is connected with the thread cutting crank 17, and the other end is connected with a shell of the sewing machine. The compression spring 18 functions to reset the shear spool 14 when the drive source 12 is de-energized; the carriage torsion spring 19 is used to reset the carriage assembly 3.
Preferably, the driving source 12 in this embodiment is an electromagnet, a cylinder, or a motor; the lock 8 is made of rubber or plastic and has certain flexibility, so that the shuttle peg 1 is prevented from being deformed due to direct rigid collision between the lock 8 and the shuttle peg 1.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although 1, the bobbin is used more herein; 2. a lower shaft; 3. a tool holder assembly; 4. trimming connecting rods; 5. mounting a column; 6. a transmission connecting rod; 61. a kidney-shaped hole; 62. a circular hole; 7. a top rod; 71. a hook part; 8. a lock head; 9. mounting a bracket; 10. a return torsion spring; 11. an axial screw; 12. a drive source; 13. a thread trimming drive shaft; 14. a thread cutting shaft; 15. a tangent cam crank assembly; 16. a drive cam; 17. a thread cutting crank; 18. a compression spring; 19. blade holder torsion spring, etc., without excluding the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
Claims (8)
1. An automatic thread trimming and bobbin locking device in a sewing machine comprises a bobbin (1) and a lower shaft (2), the automatic thread trimming and bobbin locking device comprises a knife rest component (3) and a thread trimming connecting rod (4) capable of driving a movable knife and a fixed knife in the knife rest component (3) to form trimming motion, and the lower shaft (2) can be connected with the thread trimming connecting rod (4) and drives the thread trimming connecting rod (4) to swing; the automatic thread trimming and shuttle peg locking device is characterized by further comprising a mounting column (5) and a transmission connecting rod (6) fixedly connected to one end of the thread trimming connecting rod (4), wherein a push rod (7) capable of swinging is arranged on the mounting column (5), a lock head (8) is fixedly arranged at one end of the push rod (7), the push rod (7) penetrates through the transmission connecting rod (6), and the transmission connecting rod (6) swings to drive the lock head (8) on the push rod (7) to move towards the shuttle peg (1).
2. The automatic thread trimming and bobbin locking device of claim 1, wherein the mounting post (5) is cylindrical and fixed on a housing of the sewing machine, the mounting post (5) is sleeved with a rotatable mounting bracket (9), one end of the ejector rod (7) is provided with a bent hook part (71) bent to one side, the lock head (8) is fixed on the bent hook part (71), and the other end of the ejector rod (7) is fixed on the mounting bracket (9).
3. The automatic thread trimming and bobbin locking device of claim 2, wherein the mounting post (5) is further sleeved with a return torsion spring (10), and one end of the return torsion spring (10) acts on the mounting post (5) or a machine shell of the sewing machine; the other end of the reset torsion spring (10) acts on the mounting bracket (9).
4. The automatic thread trimming and bobbin locking device in a sewing machine according to claim 1, 2 or 3, wherein the transmission link (6) is in a shape of a strip with a bent middle part, one end of the transmission link (6) is provided with a waist-shaped hole (61) along the length direction of the transmission link, the other end of the transmission link (6) is provided with a circular hole (62), the push rod (7) is arranged in the waist-shaped hole (61) in a penetrating manner, and a shaft position screw (11) which is screwed at one end of the thread trimming link (4) is inserted into the circular hole (62).
5. The automatic thread trimming and bobbin locking device in a sewing machine according to claim 1, 2 or 3, wherein a driving source (12) and a thread trimming driving shaft (13) capable of rotating are arranged in a casing of the sewing machine, the output end of the driving source (12) is connected with a thread trimming shaft (14), and a thread trimming cam crank assembly (15) is fixedly arranged on the thread trimming shaft (14); a driving cam (16) is fixedly arranged on the lower shaft (2), and the driving source (12) can drive the shear line shaft (14) to axially move and enable the tangent cam crank assembly (15) to be in clutch with the driving cam (16); one end of the trimming drive shaft (13) is movably connected with the trimming cam crank assembly (15), the other end of the trimming drive shaft is fixedly connected with the trimming crank (17), one end of the trimming connecting rod (4) is rotatably connected with the trimming crank (17), and the other end of the trimming connecting rod is rotatably connected with the transmission connecting rod (6).
6. The automatic thread trimming and bobbin locking device in sewing machine according to claim 5, wherein a compression spring (18) is sleeved on one end of the thread trimming spool (14), and both ends of the compression spring (18) respectively act on the thread trimming spool (14) and the housing of sewing machine; the thread cutting machine is characterized in that a knife rest torsion spring (19) is sleeved outside the thread cutting driving shaft (13), one end of the knife rest torsion spring (19) is connected with the thread cutting crank (17), and the other end of the knife rest torsion spring is connected with a shell of the sewing machine.
7. The automatic thread trimming and bobbin locking device in a sewing machine according to claim 5, wherein the driving source (12) is an electromagnet, a cylinder or a motor.
8. The automatic thread trimming and bobbin locking device in a sewing machine according to claim 1, 2 or 3, wherein the lock head (8) is made of rubber or plastic.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020542130.9U CN212103240U (en) | 2020-04-14 | 2020-04-14 | Automatic thread trimming and bobbin locking device in sewing machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020542130.9U CN212103240U (en) | 2020-04-14 | 2020-04-14 | Automatic thread trimming and bobbin locking device in sewing machine |
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| CN212103240U true CN212103240U (en) | 2020-12-08 |
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| CN202020542130.9U Active CN212103240U (en) | 2020-04-14 | 2020-04-14 | Automatic thread trimming and bobbin locking device in sewing machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116497532A (en) * | 2023-06-28 | 2023-07-28 | 江苏长海消防装备有限公司 | Sewing machine thread cutting mechanism for processing firefighting gloves |
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2020
- 2020-04-14 CN CN202020542130.9U patent/CN212103240U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116497532A (en) * | 2023-06-28 | 2023-07-28 | 江苏长海消防装备有限公司 | Sewing machine thread cutting mechanism for processing firefighting gloves |
| CN116497532B (en) * | 2023-06-28 | 2023-08-29 | 江苏长海消防装备有限公司 | Sewing machine thread cutting mechanism for processing firefighting gloves |
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Address after: 317502 No.8 Jinxiu Road, Xinhe Town, Wenling City, Taizhou City, Zhejiang Province Patentee after: Meiji Technology Group Co.,Ltd. Address before: 317502 Zhongxiang Industrial Zone, Xinhe Town, Wenling City, Taizhou City, Zhejiang Province Patentee before: ZHEJIANG MAQI SEWING MACHINE Co.,Ltd. |