CN212426390U - Thread cutting mechanism of sewing machine - Google Patents
Thread cutting mechanism of sewing machine Download PDFInfo
- Publication number
- CN212426390U CN212426390U CN202020682187.9U CN202020682187U CN212426390U CN 212426390 U CN212426390 U CN 212426390U CN 202020682187 U CN202020682187 U CN 202020682187U CN 212426390 U CN212426390 U CN 212426390U
- Authority
- CN
- China
- Prior art keywords
- thread trimming
- crank
- trimming
- shaft
- thread
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model belongs to the technical field of make up equipment, a sewing machine's thread trimming mechanism is related to, it has solved current thread trimming mechanism noise big, thread trimming effect unstability scheduling problem. This thread trimming mechanism includes the motor, the thread trimming driving piece, the thread trimming crank, thread trimming drive shaft and cutter unit spare, the motor is fixed in on sewing machine's the casing, the thread trimming driving piece is fixed in on the output shaft of motor, the articulate of thread trimming one end on the casing, the other end of thread trimming driving piece can cooperate with this thread trimming crank's the other end, thereby drive this thread trimming crank swing, the thread trimming drive shaft rotates and sets up on the casing, be provided with between thread trimming crank and this thread trimming drive shaft and drive the wobbling transmission assembly of this thread trimming drive shaft, cutter unit spare is connected with the thread trimming drive shaft. Compare with the mode that adopts electro-magnet, cam, the noise that produces when this application can effectively reduce the trimming improves the stability of trimming effect simultaneously.
Description
Technical Field
The utility model belongs to the technical field of make up equipment, a sewing machine's thread trimming mechanism is related to.
Background
In the prior art, the thread cutting driving of the sewing machine is usually realized by matching an electromagnet with a cam and the like.
The sewing machine thread trimming device and the sewing machine disclosed in the national patent CN 106948103A comprise a lower shaft, a thread trimming cam fixed on the lower shaft, a movable cutter assembly capable of swinging around the lower shaft, a thread trimming driving shaft, a thread trimming power source, a thread trimming driving crank and a thread trimming crank fixed on the thread trimming driving shaft, and a driving assembly, wherein the movable cutter assembly comprises at least one movable cutter, the peripheral surface of the thread trimming cam is provided with a thread trimming driving cam surface, the thread trimming driving crank is provided with a crank arm part, a movable roller pin shaft is arranged in the crank arm part in a penetrating manner, and a roller is arranged on the roller pin shaft; when the trimming machine is used for trimming, the trimming power source drives the roller pin shaft to move, so that the roller moves towards the direction close to the trimming cam and is matched with the trimming driving cam surface, and the trimming crank is connected with the movable cutter assembly through the driving assembly and drives the movable cutter assembly to swing.
However, in the above thread trimming device, the thread trimming operation is triggered by the electromagnet, which causes a loud noise and an unstable thread trimming effect.
SUMMERY OF THE UTILITY MODEL
The utility model aims at having the above-mentioned problem to current technique, provided a sewing machine's thread trimming mechanism, the utility model aims to solve the technical problem that: how to reduce the noise of this thread trimming mechanism, improve thread trimming effect stability.
The purpose of the utility model can be realized by the following technical proposal:
a thread trimming mechanism for a sewing machine, the thread trimming mechanism comprising:
the motor is fixed on a shell of the sewing machine;
the trimming driving piece is fixed on an output shaft of the motor;
one end of the trimming crank is hinged to the shell, and the other end of the trimming driving piece can be matched with the other end of the trimming crank so as to drive the trimming crank to swing;
the thread cutting driving shaft is rotatably arranged on the shell, and a transmission assembly capable of driving the thread cutting driving shaft to swing is arranged between the thread cutting crank and the thread cutting driving shaft;
and the cutter assembly is connected with the trimming drive shaft.
The working principle is as follows: when in thread cutting, the motor rotates to drive the thread cutting driving piece on the output shaft of the motor to move, thereby driving the thread cutting crank to swing; the thread cutting crank can drive the thread cutting driving shaft to swing through the transmission assembly, and finally drives the cutter assembly to move to cut threads. Compare with the mode that adopts electro-magnet, cam, the noise that produces when this application can effectively reduce the trimming improves the stability of trimming effect simultaneously.
In the thread trimming mechanism of the sewing machine, the transmission assembly comprises a thread trimming connecting rod and a crank portion fixed on the thread trimming driving shaft, one end of the thread trimming connecting rod is hinged to the thread trimming crank, and the other end of the thread trimming connecting rod is hinged to the crank portion. The thread cutting crank swings to drive the thread cutting connecting rod to swing, so that the thread cutting driving shaft is driven to swing through the crank portion.
In the thread trimming mechanism of the sewing machine, the thread trimming driving member comprises a thread trimming driving crank, one end of the thread trimming driving crank is fixed on the output shaft of the motor, and the other end of the thread trimming driving crank can be in contact with the thread trimming crank, so that the thread trimming crank is driven to swing. The motor rotates to drive the trimming driving crank to swing, and when the trimming driving crank is contacted with the trimming crank, the trimming crank can be driven to swing.
In the thread trimming mechanism of the sewing machine, the thread trimming crank is provided with the roller which can be contacted with the thread trimming driving crank. After the roller is designed, the noise and friction generated when the trimming driving crank is contacted with the trimming crank can be reduced.
In the thread trimming mechanism of the sewing machine, the thread trimming mechanism further comprises an axial screw and a nut, a threaded through hole is formed in the thread trimming crank, and the axial screw sequentially penetrates through the roller and the threaded through hole and is connected with the nut. During installation, the roller can be sleeved on the shaft position screw, one end of the shaft position screw penetrates through the threaded through hole of the trimming crank, and finally the nut and the shaft position screw are screwed tightly to achieve installation of the roller.
In the thread trimming mechanism of the sewing machine, the thread trimming driving crank is provided with the reset pin, the thread trimming crank is provided with the reset groove corresponding to the reset pin, and when the cutter assembly is engaged with the thread trimming, the reset pin slides into the reset groove; when the motor rotates reversely, the reset pin can drive the wire cutting crank to rotate reversely, so that the cutter assembly is loosened and reset until the reset pin slides out of the reset groove. When the cutter assembly is in a state of occluding the cut wires, the reset pin is just positioned in the reset groove; and if the cutting line card sword appears, the motor can reverse, thereby drive cutting line drive crank reverse swing, make the round pin synchronous movement that resets, with the cell wall contact in the groove that resets, drive cutting line crank reverse swing, finally drive cutting line drive shaft reverse rotation, make cutter unit spare be in the state of loosening, realize resetting, realize forcing back the sword, and the round pin that resets at this moment follows the inslot roll-off that resets, even cutting line drive crank's reverse swing angle is too big, can not influence cutter unit spare yet.
In the thread trimming mechanism of the sewing machine, the shell is fixed with the shaft sleeve, the thread trimming driving shaft is inserted in the shaft sleeve and is in running fit with the shaft sleeve, and a reset assembly capable of driving the cutter assembly to reset is arranged between the shaft sleeve and the cutter assembly.
In the thread trimming mechanism of the sewing machine, the cutter component comprises a movable cutter crank, a movable cutter connecting rod, a movable cutter holder and a movable cutter, one end of the movable cutter crank is fixed on the thread trimming driving shaft, the other end of the movable cutter crank is hinged with one end of the movable cutter connecting rod, the other end of the movable cutter connecting rod is hinged with the movable cutter holder, and the movable cutter is fixed on the movable cutter holder. The thread trimming driving shaft rotates to drive the movable cutter crank to swing, so that the movable cutter connecting rod drives the movable cutter frame to rotate, and finally the movable cutter is driven to move for trimming threads.
In the thread trimming mechanism of the sewing machine, the reset assembly comprises a reset torsion spring sleeved on the shaft sleeve, and one end of the reset torsion spring abuts against the movable knife crank. After the reset torsion spring is designed, when the trimming is finished, the reset torsion spring can drive the movable knife to reset.
In the thread trimming mechanism of the sewing machine, the casing is provided with the fixed shaft, the thread trimming crank is provided with the mounting hole corresponding to the fixed shaft, one end of the fixed shaft penetrates through the mounting hole, and the limiting snap spring is arranged between the fixed shaft and the thread trimming crank. After the clamp spring is designed, the trimming crank can be axially limited, so that the trimming crank is installed.
Compared with the prior art, the utility model has the advantages of it is following:
1. the method and the device can effectively reduce noise and vibration generated during thread trimming, and improve the stability of thread trimming effect;
2. if the cutter is clamped, the motor can rotate reversely, so that the wire cutting driving crank is driven to swing reversely, the reset pin moves synchronously and is in contact with the groove wall of the reset groove, the wire cutting crank is driven to swing reversely, the wire cutting driving shaft is finally driven to rotate reversely, the cutter assembly is in a loosening state, the reset is realized, and the forced cutter return is realized;
3. the application has simple structure, easy production and easy installation and debugging.
Drawings
Fig. 1 is an exploded view of the present thread trimming mechanism.
Fig. 2 is a schematic structural diagram of the thread trimming mechanism in a reset state.
Fig. 3 is a schematic structural diagram of the thread trimming mechanism in a thread trimming state.
Fig. 4 is a schematic structural view of the trimming crank.
Fig. 5 is a schematic view of the structure of the wire cutting drive crank.
In the figure, 1, a motor; 2. a trimming driving member; 21. a trimming drive crank; 22. a reset pin; 3. a thread cutting crank; 31. a roller; 32. an axial screw; 33. a nut; 34. a threaded through hole; 35. a reset groove; 36. a fixed shaft; 37. mounting holes; 38. a limiting clamp spring; 4. a thread trimming drive shaft; 41. a shaft sleeve; 5. a transmission assembly; 51. trimming connecting rods; 52. a crank portion; 6. a cutter assembly; 61. a movable knife crank; 62. a movable knife connecting rod; 63. a movable knife rest; 64. moving a knife; 7. a return 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, 2, 3, 4 and 5, the thread cutting mechanism includes a motor 1, a thread cutting driving member 2, a thread cutting crank 3, a thread cutting driving shaft 4 and a cutter assembly 6.
Wherein, motor 1 is fixed in on sewing machine's the casing, and trimming driving piece 2 is fixed in on motor 1's the output shaft, and trimming crank 3's one end articulates on the casing, and trimming driving piece 2's the other end can cooperate with this trimming crank 3's the other end to drive this trimming crank 3 swing.
In this embodiment, the trimming driving member 2 includes the trimming driving crank 21, one end of the trimming driving crank 21 is fixed to the output shaft of the motor 1, and the other end of the trimming driving crank 21 can contact with the trimming crank 3, so as to drive the trimming crank 3 to swing.
The trimming crank 3 can be mounted in the following way: a fixed shaft 36 is arranged on the machine shell, a mounting hole 37 corresponding to the fixed shaft 36 is formed in the trimming crank 3, one end of the fixed shaft 36 penetrates through the mounting hole 37, and a limiting snap spring 38 is arranged between the fixed shaft 36 and the trimming crank 3. Of course, the thread cutting crank 3 may also be hinged to the housing in other manners, for example, a rotating shaft is rotatably disposed on the housing, and the thread cutting crank 3 may also be fixed to the rotating shaft, and other manners that the thread cutting crank 3 can be hinged to the housing are also realized, which will not be described in detail herein.
In order to reduce noise and friction generated when the trimming crank 21 contacts the trimming crank 3, in the present embodiment, the trimming crank 3 is provided with a roller 31 capable of contacting the trimming crank 21. Of course, if the roller 31 is designed on the trimming driving crank 21, the shape and size of the trimming crank 3 can be modified accordingly, and the transmission between the two can be realized, but the effect is not as good as the preferred scheme in the embodiment.
Specifically, the roller 31 may be installed in the following manner: an axial position screw 32 and a nut 33 are designed, a threaded through hole 34 is formed in the trimming crank 3, and the axial position screw 32 sequentially penetrates through the roller 31 and the threaded through hole 34 and is connected with the nut 33.
It should be noted that, in the present embodiment, the other end of the trimming driving crank 21 and the trimming crank 3 are preferably driven in a contact and separation manner, but as another solution, the two may also be driven and connected by a driving member such as a connecting rod, and the like.
In order to avoid the situation of knife jamming during wire cutting, in the present embodiment, the wire cutting driving crank 21 is provided with the reset pin 22, the wire cutting crank 3 is provided with the reset groove 35 corresponding to the reset pin 22, and when the cutter assembly 6 engages with the wire cutting, the reset pin 22 slides into the reset groove 35; when the motor 1 rotates reversely, the reset pin 22 can drive the wire cutting crank 3 to rotate reversely, so that the cutter assembly 6 is released and reset until the reset pin 22 slides out of the reset groove 35, and forced reset is realized.
As shown in fig. 1, 2 and 3, the thread cutting driving shaft 4 is rotatably disposed on the housing, and a transmission assembly 5 capable of driving the thread cutting driving shaft 4 to swing is disposed between the thread cutting crank 3 and the thread cutting driving shaft 4.
In this embodiment, a shaft sleeve 41 is fixed on the housing, and the thread cutting driving shaft 4 is inserted into the shaft sleeve 41 and is in running fit with the shaft sleeve 41.
Preferably, in the present embodiment, the transmission assembly 5 includes a thread cutting connecting rod 51 and a crank portion 52 fixed on the thread cutting driving shaft 4, one end of the thread cutting connecting rod 51 is hinged to the thread cutting crank 3, and the other end of the thread cutting connecting rod 51 is hinged to the crank portion 52. Here, if other link mechanisms are adopted, or the crank portion 52 and the trimming drive shaft 4 are replaced by an integrated type or a split type, the transmission between the trimming link 51 and the trimming drive shaft 4 can be realized, and the like, and the present invention is also within the protection scope of the present application.
As shown in fig. 1, 2 and 3, the cutter assembly 6 is connected with the trimming drive shaft 4, and a reset assembly capable of driving the cutter assembly 6 to reset is arranged between the shaft sleeve 41 and the cutter assembly 6.
Specifically, the cutter assembly 6 includes a movable knife crank 61, a movable knife connecting rod 62, a movable knife holder 63 and a movable knife 64, one end of the movable knife crank 61 is fixed on the thread cutting driving shaft 4, the other end of the movable knife crank 61 is hinged with one end of the movable knife connecting rod 62, the other end of the movable knife connecting rod 62 is hinged with the movable knife holder 63, and the movable knife 64 is fixed on the movable knife holder 63.
In this embodiment, the reset assembly includes a reset torsion spring 7 sleeved on the shaft sleeve 41, and one end of the reset torsion spring 7 abuts against the movable knife crank 61.
It should be noted that the cutter assembly 6 in this embodiment can adopt a mode of dual moving cutters, or a mode of combining the moving cutters and the fixed cutters, and can be matched with the thread trimming driving shaft 4 to trim threads. The structure of combining the double-moving knife or the moving knife and the fixed knife is the prior art and is not described in detail herein.
The working principle of the utility model is as follows:
when a wire is cut, the motor 1 rotates to drive the wire cutting driving crank 21 on the output shaft of the motor 1 to move, so that the wire cutting driving crank 21 is in contact with the roller 31 on the wire cutting crank 3 to drive the wire cutting crank 3 to swing, then the wire cutting driving shaft 4 is driven to rotate through the wire cutting connecting rod 51, finally the movable knife crank 61, the movable knife connecting rod 62 and the movable knife rest 63 are sequentially driven to move, the movable knife 64 moves to realize engagement wire cutting, and at the moment, the reset pin 22 on the wire cutting driving crank just slides into the reset groove 35 of the wire cutting crank 3;
after the trimming is finished, the movable knife crank 61 can drive the movable knife connecting rod 62, the movable knife rest 63 and the movable knife 64 to move reversely under the action of the torsion spring to realize resetting; if a knife is jammed, the motor 1 can drive the wire cutting driving crank 21 to swing reversely by reverse rotation, so that the reset pin 22 moves synchronously to contact with the groove wall of the reset groove 35 to drive the wire cutting crank 3 to swing reversely, and finally drive the wire cutting driving shaft 4 to rotate reversely, so that the cutter assembly 6 is in a loosening state, reset is realized, and forced knife return is realized.
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.
Claims (10)
1. A thread trimming mechanism for a sewing machine, the thread trimming mechanism comprising:
the motor (1), the said motor (1) is fixed on chassis of the Sewing machines;
the trimming driving piece (2), the trimming driving piece (2) is fixed on the output shaft of the motor (1);
one end of the trimming crank (3) is hinged to the shell, and the other end of the trimming driving piece (2) can be matched with the other end of the trimming crank (3) so as to drive the trimming crank (3) to swing;
the thread trimming mechanism comprises a thread trimming driving shaft (4), wherein the thread trimming driving shaft (4) is rotatably arranged on a machine shell, and a transmission assembly (5) capable of driving the thread trimming driving shaft (4) to swing is arranged between a thread trimming crank (3) and the thread trimming driving shaft (4);
the cutter component (6), the cutter component (6) with cut line drive shaft (4) are connected.
2. The thread trimming mechanism of a sewing machine according to claim 1, wherein the transmission assembly (5) comprises a thread trimming connecting rod (51) and a crank portion (52) fixed to the thread trimming driving shaft (4), one end of the thread trimming connecting rod (51) is hinged to the thread trimming crank (3), and the other end of the thread trimming connecting rod (51) is hinged to the crank portion (52).
3. The thread trimming mechanism of a sewing machine according to claim 1, characterized in that the thread trimming driving member (2) comprises a thread trimming driving crank (21), one end of the thread trimming driving crank (21) is fixed on the output shaft of the motor (1), and the other end of the thread trimming driving crank (21) can contact with the thread trimming crank (3) to drive the thread trimming crank (3) to swing.
4. The thread trimming mechanism of a sewing machine according to claim 3, characterized in that the thread trimming crank (3) is provided with a roller (31) which can be brought into contact with the thread trimming drive crank (21).
5. The thread trimming mechanism of a sewing machine according to claim 4, further comprising a shaft screw (32) and a nut (33), wherein the thread trimming crank (3) is provided with a threaded through hole (34), and the shaft screw (32) sequentially passes through the roller (31) and the threaded through hole (34) and is connected with the nut (33).
6. The thread trimming mechanism of sewing machine according to claim 3, 4 or 5, wherein the thread trimming driving crank (21) is provided with a reset pin (22), the thread trimming crank (3) is provided with a reset groove (35) corresponding to the reset pin (22), and when the cutter assembly (6) engages with the thread trimming, the reset pin (22) slides into the reset groove (35); when the motor (1) rotates reversely, the reset pin (22) can drive the wire cutting crank (3) to rotate reversely, so that the cutter assembly (6) is released and reset until the reset pin (22) slides out of the reset groove (35).
7. The thread trimming mechanism of sewing machine according to claim 1 or 2 or 3 or 4 or 5, characterized in that a shaft sleeve (41) is fixed on the housing, the thread trimming driving shaft (4) is inserted in the shaft sleeve (41) and is in running fit with the shaft sleeve (41), and a reset component capable of driving the cutter component (6) to reset is arranged between the shaft sleeve (41) and the cutter component.
8. The thread trimming mechanism of a sewing machine according to claim 7, wherein the cutter assembly (6) comprises a movable cutter crank (61), a movable cutter connecting rod (62), a movable cutter holder (63) and a movable cutter (64), one end of the movable cutter crank (61) is fixed on the thread trimming driving shaft (4), the other end of the movable cutter crank (61) is hinged with one end of the movable cutter connecting rod (62), the other end of the movable cutter connecting rod (62) is hinged with the movable cutter holder (63), and the movable cutter (64) is fixed on the movable cutter holder (63).
9. The thread trimming mechanism of a sewing machine according to claim 8, wherein the return assembly comprises a return torsion spring (7) sleeved on the shaft sleeve (41), and one end of the return torsion spring (7) abuts against the movable knife crank (61).
10. The thread trimming mechanism of sewing machine according to claim 1 or 2 or 3 or 4 or 5, characterized in that the housing is provided with a fixed shaft (36), the thread trimming crank (3) is provided with a mounting hole (37) corresponding to the fixed shaft (36), one end of the fixed shaft (36) passes through the mounting hole (37), and a limit clamp spring (38) is arranged between the fixed shaft (36) and the thread trimming crank (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020682187.9U CN212426390U (en) | 2020-04-28 | 2020-04-28 | Thread cutting mechanism of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020682187.9U CN212426390U (en) | 2020-04-28 | 2020-04-28 | Thread cutting mechanism of sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212426390U true CN212426390U (en) | 2021-01-29 |
Family
ID=74294056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020682187.9U Expired - Fee Related CN212426390U (en) | 2020-04-28 | 2020-04-28 | Thread cutting mechanism of sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212426390U (en) |
-
2020
- 2020-04-28 CN CN202020682187.9U patent/CN212426390U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106637735B (en) | Thread trimming and presser foot lifting mechanism and sewing machine | |
| CN106894175B (en) | automatic thread trimming mechanism of sewing machine and sewing machine | |
| CN106835527B (en) | A kind of sewing machine automatic shearing mechanism and sewing machine | |
| CN212426390U (en) | Thread cutting mechanism of sewing machine | |
| CN109234929B (en) | Thread cutting mechanism of sewing machine and sewing machine | |
| CN208167272U (en) | A kind of automatic shearing mechanism and sewing machine | |
| CN111153260A (en) | Winding switching device applied to adhesive label winding machine | |
| CN212270404U (en) | Thread cutting mechanism of sewing machine | |
| CN212103240U (en) | Automatic thread trimming and bobbin locking device in sewing machine | |
| CN2637057Y (en) | Pipe cutter | |
| CN215289231U (en) | Thread cutting driving assembly of sewing machine | |
| CN108796856B (en) | Automatic thread trimming mechanism of sewing machine | |
| CN208183272U (en) | Cutting facility and sewing machine | |
| CN209652582U (en) | Compact automatic thread trimming device | |
| CN111041723A (en) | Thread cutting mechanism of sewing machine | |
| CN209636465U (en) | A kind of the automatic shearing mechanism and sewing machine of sewing machine | |
| CN216998827U (en) | Thread trimming and loosening mechanism of sewing machine and sewing machine with same | |
| CN209243337U (en) | A kind of thread cutting mechanism and sewing machine of sewing machine | |
| CN112064220A (en) | Presser foot mechanism is lifted to sewing machine's trimming | |
| CN214193704U (en) | Thread trimming mechanism of overedger | |
| CN213804305U (en) | Trimming and presser foot lifting integrated mechanism of overedger | |
| CN210368229U (en) | Thread trimming mechanism and overedger thereof | |
| CN210826664U (en) | Thread cutting mechanism of sewing machine | |
| CN216193262U (en) | Electromagnet-driven thread trimming mechanism | |
| CN211394888U (en) | Thread cutting mechanism of platform type sewing machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210129 |