CN215289231U - Thread cutting driving assembly of sewing machine - Google Patents
Thread cutting driving assembly of sewing machine Download PDFInfo
- Publication number
- CN215289231U CN215289231U CN202020682347.XU CN202020682347U CN215289231U CN 215289231 U CN215289231 U CN 215289231U CN 202020682347 U CN202020682347 U CN 202020682347U CN 215289231 U CN215289231 U CN 215289231U
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- crank
- trimming
- thread
- drive
- thread cutting
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Abstract
The utility model belongs to the technical field of make up equipment, a sewing machine's trimming drive assembly is related to, it has solved the complicated, the difficult scheduling problem of installation and debugging of current sewing machine trimming mechanism back knife structure. This trimming drive assembly includes rotary drive source, tangent line crank and trimming crank, and on the tangent line crank was fixed in rotary drive source's the output shaft, the trimming crank can be around the fulcrum swing of self, has on the tangent line crank can contact with the trimming crank, and drive the trimming drive division that the trimming was carried out in the forward swing of the latter, has the portion of restoring to the throne on the trimming crank, has on the tangent line crank can contact with the portion of restoring to the throne, and drive the trimming crank reverse swing and carry out the drive division that resets of back knife. Compared with the structure adopting a cam mode to forcibly reset in the prior art, the structure of the trimming driving component is more simplified, the production cost is lower, and the debugging is convenient during installation.
Description
Technical Field
The utility model belongs to the technical field of make up equipment, a sewing machine's trimming drive assembly 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.
When the thread cutting device returns the thread, the thread cutting device needs to return the thread under the action of the torsion spring, and when the thread cutting device is blocked, the thread cutting device needs to forcibly return the thread by the forced return driving part on the cam. However, the device has a complex structure, and the size and installation accuracy of parts such as the cam and the like are high, so that the installation and debugging are difficult.
SUMMERY OF THE UTILITY MODEL
The utility model aims at having the above-mentioned problem to current technique, provided a sewing machine's trimming drive assembly, the utility model aims to solve the technical problem that: how to simplify the structure of this trimming drive assembly, reduction in production cost.
The purpose of the utility model can be realized by the following technical proposal:
a thread cutting drive assembly for a sewing machine, the thread cutting drive assembly comprising:
a rotary drive source;
a tangent crank fixed to an output shaft of the rotary drive source;
the thread cutting crank can swing around a fulcrum of the thread cutting crank;
the thread cutting crank is provided with a thread cutting driving part which can be contacted with the thread cutting crank and drive the thread cutting crank to swing positively to perform thread cutting;
the wire cutting crank is provided with a reset part, and the wire cutting crank is provided with a reset driving part which can be in contact with the reset part and drives the wire cutting crank to reversely swing to execute knife return.
The working principle is as follows: when the thread is cut, the rotary driving source drives the thread cutting crank to swing in the positive direction, so that the thread cutting driving part on the thread cutting crank is contacted with the thread cutting crank and drives the thread cutting crank to swing in the positive direction, and finally, the cutter assembly of the sewing machine moves in the positive direction to cut the thread. When the thread cutting machine is reset, the rotary driving source drives the thread cutting crank to reversely swing, the reset driving part on the thread cutting crank is contacted with the reset part on the thread cutting crank, so that the thread cutting crank is driven to reversely swing, and finally the cutter assembly of the sewing machine reversely moves to realize the return reset. Compared with the structure adopting a cam mode to forcibly reset in the prior art, the structure of the trimming driving component is more simplified, the production cost is lower, and the debugging is convenient during installation.
In the thread cutting driving assembly of the sewing machine, the thread cutting crank is provided with the roller, and a side surface of the thread cutting crank, which can be in contact with the roller, is the thread cutting driving part. The tangent line crank forward swing can make one side of self contact with the gyro wheel on the trimming crank to drive the trimming crank and swing around the fulcrum, carry out the trimming.
In the thread trimming driving assembly of the sewing machine, the reset groove is formed between the reset part and the body of the thread trimming crank, and when the thread trimming crank is driven by the forward swing of the thread trimming crank to swing to perform thread trimming, the reset driving part on the thread trimming crank can slide into the reset groove; when the wire cutting crank swings reversely, the reset driving part can be in contact with the reset part on the wire cutting crank and drives the wire cutting crank to swing reversely until the wire cutting crank slides out of the reset groove. When the wire is cut, the wire cutting crank swings in the positive direction to drive the wire cutting crank to swing in the positive direction, and the reset driving part on the wire cutting crank can slide into the reset groove in the process; when the cutter is forced to return, the tangent crank reversely swings, the reset driving part on the tangent crank is in contact with the reset part on the tangent crank to drive the tangent crank to reversely swing, the cutter is returned, and after the tangent crank reversely swings for a certain angle, the reset driving part can slide out from the reset groove and is not in contact with the reset part, so that the influence of the reverse angle on the tangent crank is avoided.
In the above thread cutting drive assembly of a sewing machine, the reset drive portion includes a reset pin disposed on the thread cutting crank.
In the thread trimming driving assembly of the sewing machine, a transmission structure is arranged between the thread trimming crank and the cutter assembly of the sewing machine, and when the thread trimming crank swings forwards and backwards around a pivot of the thread trimming crank, the transmission structure can drive the cutter assembly to move to perform thread trimming and knife returning.
In the thread trimming driving assembly of the sewing machine, the cutter assembly comprises the movable cutter, the movable cutter holder, the movable cutter connecting rod and the movable cutter crank, the movable cutter is fixed on the movable cutter holder, the movable cutter holder is hinged with one end of the movable cutter connecting rod, and the other end of the movable cutter connecting rod is hinged with one end of the movable cutter crank. The movable knife crank swings and can drive the movable knife to move sequentially through the movement of the movable knife connecting rod and the movable knife rest, so that the line shearing or the knife returning is realized.
In the above thread trimming driving assembly of the sewing machine, as a scheme, a fixed shaft is provided on a housing of the sewing machine, and a mounting hole rotationally matched with the fixed shaft is provided on the thread trimming crank. The trimming crank swings around a self fulcrum through a fixed shaft.
In the trimming drive assembly of the sewing machine, the transmission structure comprises a drive shaft and a trimming connecting rod, one end of the trimming connecting rod is hinged to the trimming crank, the other end of the trimming connecting rod is hinged to the crank portion at one end of the drive shaft, the drive shaft is rotatably arranged on the shell, and the other end of the drive shaft is connected with the movable knife crank. The thread cutting crank swings, and the driving shaft is driven to rotate through the thread cutting connecting rod, so that the movable cutter crank is driven to move and the like, and thread cutting and knife returning are realized.
In the thread trimming driving assembly of the sewing machine, as another scheme, the transmission structure comprises a rotating shaft rotatably arranged on the machine shell, one end of the rotating shaft is fixed with the thread trimming crank, and the other end of the rotating shaft is fixed with the other end of the movable knife crank. In the scheme, the rotating shaft is a pivot of the swing of the trimming crank, and when the trimming crank swings, the rotating shaft can be driven to rotate positively and negatively, so that the movable knife crank, the movable knife connecting rod, the movable knife rest and the movable knife are driven to move in sequence, and trimming and resetting are realized.
In the thread trimming driving assembly of the sewing machine, as another scheme, an installation shaft is fixed on the machine shell, the transmission structure comprises a shaft sleeve which is sleeved on the installation shaft and is in running fit with the shaft sleeve, one end of the shaft sleeve is connected with the thread cutting crank, and the other end of the shaft sleeve is connected with the other end of the movable knife crank. In the scheme, the mounting shaft is a pivot of the swing of the trimming crank, the trimming crank swings forwards and backwards to drive the shaft sleeve to rotate forwards and backwards, so that the movable knife crank, the movable knife connecting rod, the movable knife rest and the movable knife are sequentially driven to move, and trimming and knife return are realized.
Compared with the prior art, the utility model has the advantages of it is following:
1. compared with the structure adopting a cam mode to forcibly reset in the prior art, the structure of the trimming driving component is more simplified, the production cost is lower, and the debugging is convenient during installation.
Drawings
Fig. 1 is an exploded view of the present shear line drive assembly in one embodiment.
Fig. 2 is a schematic structural diagram of the trimming driving assembly according to the first embodiment.
Fig. 3 is a schematic structural diagram of the tangent crank according to the first embodiment.
Fig. 4 is a schematic structural diagram of the present trimming crank according to the first embodiment.
Fig. 5 is a schematic structural diagram of the transmission structure according to the first embodiment.
Fig. 6 is a schematic structural diagram of the transmission structure in the second embodiment.
Fig. 7 is a schematic structural diagram of the transmission structure in the third embodiment.
In the figure, 1, a rotation drive source; 2. a tangent crank; 21. a trimming drive section; 22. a reset drive section; 23. a second nut; 3. a thread cutting crank; 31. a reset section; 32. a roller; 33. a reset groove; 34. an axial screw; 35. a first nut; 4. a transmission structure; 41. a fixed shaft; 42. mounting holes; 43. a drive shaft; 44. trimming connecting rods; 45. a crank portion; 46. a rotating shaft; 47. installing a shaft; 48. a shaft sleeve; 5. a cutter assembly; 51. moving a knife; 52. a movable knife rest; 53. a movable knife connecting rod; 54. moving knife crank.
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.
The first embodiment is as follows:
as shown in fig. 1, 2, 3 and 4, the thread cutting driving assembly of the sewing machine includes a rotary driving source 1, a thread cutting crank 2 and a thread cutting crank 3, wherein the thread cutting crank 2 is fixed on an output shaft of the rotary driving source 1, the thread cutting crank 3 can swing around a fulcrum of the thread cutting crank 3, the thread cutting crank 2 is provided with a thread cutting driving part 21 which can contact with the thread cutting crank 3 and drive the latter to swing forward to perform thread cutting, the thread cutting crank 3 is provided with a reset part 31, and the thread cutting crank 2 is provided with a reset driving part 22 which can contact with the reset part 31 and drive the thread cutting crank 3 to swing backward to perform knife return.
In the present embodiment, the rotary drive source 1 is preferably a motor fixed to the sewing machine housing, and is less noisy as a drive source and stable in thread cutting. Of course, as another alternative, a rotary electromagnet may be used.
Preferably, in the present embodiment, the thread cutting crank 3 is provided with a roller 32, and a side surface of the thread cutting crank 2 that can contact with the roller 32 is the thread cutting driving portion 21. Specifically, the roller 32 may be mounted to the shear crank 3 by a shaft screw 34 and a nut 35.
Of course, other mounting arrangements for the rollers 32 are possible. Or the thread cutting crank 3 is provided with a bulge which can be contacted with the thread cutting crank 2, but the effect is not better than that of the roller 32, but the transmission can also be realized.
Preferably, in the present embodiment, a reset groove 33 is formed between the reset portion 31 and the body of the wire cutting crank 3, and when the wire cutting crank 2 swings in the positive direction to drive the wire cutting crank 3 to swing to cut a wire, the reset driving portion 22 on the wire cutting crank 2 can slide into the reset groove 33; when the wire cutting crank 2 swings reversely, the reset driving part 22 can contact with the reset part 31 on the wire cutting crank 3 to drive the wire cutting crank 3 to swing reversely to realize knife return until the wire cutting crank slides out of the reset groove 33.
Preferably, the reset driving part 22 includes a reset pin disposed on the tangent crank 2, and the reset pin may be mounted by a second nut 23.
Of course, the reset driving part 22 may be designed in other rod shape or column shape, may be designed in a manner of being separated from the tangent crank 2 and connected by a fastener, and may be designed in a manner of being integrally formed with the tangent crank 2.
It should be noted that, although the specific shapes of the tangent crank 2 and the tangent crank 3 are disclosed in the present embodiment and the drawings of the specification, the present invention is not limited to the shapes disclosed in the present embodiment.
As shown in fig. 5, a transmission structure 4 is arranged between the thread cutting crank 3 and the cutter assembly 5 of the sewing machine, and when the thread cutting crank 3 swings around its own fulcrum forward and backward, the transmission structure 4 can drive the cutter assembly 5 to move to perform thread cutting and knife returning.
In this embodiment, the cutter assembly 5 includes a movable blade 51, a movable blade holder 52, a movable blade connecting rod 53 and a movable blade crank 54, the movable blade 51 is fixed on the movable blade holder 52, the movable blade holder 52 is hinged to one end of the movable blade connecting rod 53, and the other end of the movable blade connecting rod 53 is hinged to one end of the movable blade crank 54.
It should be noted that, the cutter assembly 5 may adopt a structure of double moving blades, or a structure of combining a fixed blade and a moving blade, and may be applied to the present application to realize thread trimming and knife returning, and the specific structure thereof is not described in detail.
Preferably, in this embodiment, a fixed shaft 41 is provided on the housing of the sewing machine, and a mounting hole 42 rotatably engaged with the fixed shaft 41 is provided on the thread cutting crank 3. Alternatively, the trimming crank 3 may be fixed to a rotating shaft which is rotatably engaged with the housing.
In this embodiment, the transmission structure 4 includes a driving shaft 43 and a thread trimming connecting rod 44, one end of the thread trimming connecting rod 44 is hinged to the thread trimming crank 3, the other end of the thread trimming connecting rod 44 is hinged to a crank portion 45 at one end of the driving shaft 43, the driving shaft 43 is rotatably disposed on the housing, and the other end of the driving shaft 43 is connected to the movable blade crank 54.
Of course, other linkage arrangements could be used for the shear link 44 and the crank portion 45 herein.
The working principle of the utility model is as follows:
when in thread cutting, the rotary driving source 1 rotates forwards to drive the thread cutting crank 2 to swing forwards, so that the thread cutting driving part 21 on the thread cutting crank 2 is contacted with the roller 32 on the thread cutting crank 3 to drive the thread cutting crank 3 to swing forwards, the driving shaft 43 is driven to rotate forwards through the thread cutting connecting rod 44, and finally the movable knife 51 in the cutter component 5 is driven to move and engage to realize thread cutting;
in the process, the reset drive 22 on the wire cutting crank 2 slides into the reset groove 33 of the wire cutting crank 3.
When the cutter is returned, the rotary driving source 1 rotates reversely to drive the thread cutting crank 2 to swing reversely, so that the reset driving part 22 on the thread cutting crank 2 is contacted with the reset part 31 on the thread cutting crank 3 to drive the thread cutting crank 3 to swing reversely, the thread cutting connecting rod 44 drives the driving shaft 43 to rotate reversely, and finally the movable cutter 51 in the cutter assembly 5 is driven to move and reset, so that the cutter return is realized. Since the reset driving part 22 can slide out of the reset groove 33 on the trimming crank 3 after the knife is cut back, the movement of the trimming crank 3 is not affected.
Example two:
the present embodiment is substantially the same as the first embodiment, except that, as shown in fig. 6, in the present embodiment, the transmission structure 4 includes a rotating shaft 46 rotatably disposed on the housing, one end of the rotating shaft 46 is fixed to the thread cutting crank 3, and the other end of the rotating shaft 46 is fixed to the other end of the movable knife crank 54.
The swing of the thread cutting crank 3 can drive the rotating shaft 46 to swing, so as to drive the movable knife crank 54 to swing, and finally, thread cutting and knife returning are realized.
It should be noted here that the rotating shaft 46, the trimming crank 3 and the movable knife crank 54 may be designed as separate parts, and the specific connection manner may be realized by fasteners, screw connections, etc., although an integrally formed manner is also contemplated.
Example three:
the present embodiment is substantially the same as the first embodiment, except that as shown in fig. 7, in the present embodiment, a mounting shaft 47 is fixed on the housing, the transmission structure 4 includes a shaft sleeve 48 sleeved on the mounting shaft 47, and the shaft sleeve 48 and the mounting shaft 47 are rotatably engaged, one end of the shaft sleeve 48 is connected to the thread cutting crank 3, and the other end of the shaft sleeve 48 is connected to the other end of the movable knife crank 54.
The thread cutting crank 3 swings to drive the shaft sleeve 48 to rotate, so that the movable knife crank 54 is driven to move, and thread cutting and knife returning are realized. The shaft sleeve 48, the thread trimming crank 3 and the movable knife crank 54 can be designed as an integral structure, and can be designed as a split structure.
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 cutting drive assembly for a sewing machine, the thread cutting drive assembly comprising:
a rotation drive source (1);
the tangent crank (2), the said tangent crank (2) is fixed on output shaft of the rotary driving source (1);
the thread cutting crank (3), the thread cutting crank (3) can swing around the fulcrum of the thread cutting crank;
the thread cutting crank (2) is provided with a thread cutting driving part (21) which can be contacted with the thread cutting crank (3) and drive the thread cutting crank to swing positively to cut threads;
the wire cutting crank (3) is provided with a reset part (31), and the wire cutting crank (2) is provided with a reset driving part (22) which can be in contact with the reset part (31) and drives the wire cutting crank (3) to reversely swing to execute knife return.
2. The thread cutting drive assembly of a sewing machine according to claim 1, characterized in that a roller (32) is provided on the thread cutting crank (3), and the side of the thread cutting crank (2) that can contact the roller (32) is the thread cutting drive portion (21).
3. The trimming drive assembly according to claim 1 or 2, characterized in that a reset groove (33) is formed between the reset portion (31) and the body of the trimming crank (3), and when the trimming crank (3) is driven by the forward swing of the trimming crank (2) to swing to perform trimming, the reset drive portion (22) on the trimming crank (2) can slide into the reset groove (33); when tangent line crank (2) reverse swing, reset drive division (22) can with reset portion (31) contact on the trimming crank (3), drive trimming crank (3) reverse swing, until follow roll-off in reset groove (33).
4. The thread cutting drive assembly of a sewing machine according to claim 3, characterized in that the reset drive (22) comprises a reset pin provided on the thread cutting crank (2).
5. The thread trimming driving assembly according to claim 3, wherein a transmission structure (4) is arranged between the thread trimming crank (3) and the cutter assembly (5) of the sewing machine, and when the thread trimming crank (3) swings forwards and backwards around a pivot of the thread trimming crank, the transmission structure (4) can drive the cutter assembly (5) to move to perform thread trimming and knife returning.
6. The trimming drive assembly according to claim 5, wherein the cutter assembly (5) comprises a movable cutter (51), a movable cutter holder (52), a movable cutter connecting rod (53) and a movable cutter crank (54), the movable cutter (51) is fixed on the movable cutter holder (52), the movable cutter holder (52) is hinged to one end of the movable cutter connecting rod (53), and the other end of the movable cutter connecting rod (53) is hinged to one end of the movable cutter crank (54).
7. The thread trimming drive assembly according to claim 6, wherein the housing of the sewing machine is provided with a fixed shaft (41), and the thread trimming crank (3) is provided with a mounting hole (42) rotatably engaged with the fixed shaft (41).
8. The thread trimming drive assembly according to claim 7, wherein the transmission structure (4) comprises a drive shaft (43) and a thread trimming connecting rod (44), one end of the thread trimming connecting rod (44) is hinged to the thread trimming crank (3), the other end of the thread trimming connecting rod (44) is hinged to a crank portion (45) at one end of the drive shaft (43), the drive shaft (43) is rotatably disposed on the housing, and the other end of the drive shaft (43) is connected to the movable knife crank (54).
9. The trimming drive assembly according to claim 6, wherein the transmission structure (4) comprises a rotating shaft (46) rotatably disposed on a housing of the sewing machine, one end of the rotating shaft (46) is fixed to the trimming crank (3), and the other end of the rotating shaft (46) is fixed to the other end of the movable knife crank (54).
10. The trimming driving assembly according to claim 6, wherein a mounting shaft (47) is fixed on a housing of the sewing machine, the transmission structure (4) comprises a shaft sleeve (48) sleeved on the mounting shaft (47) and rotatably engaged with the mounting shaft, one end of the shaft sleeve (48) is connected with the trimming crank (3), and the other end of the shaft sleeve (48) is connected with the other end of the movable knife crank (54).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020682347.XU CN215289231U (en) | 2020-04-28 | 2020-04-28 | Thread cutting driving assembly of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020682347.XU CN215289231U (en) | 2020-04-28 | 2020-04-28 | Thread cutting driving assembly of sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215289231U true CN215289231U (en) | 2021-12-24 |
Family
ID=79512083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020682347.XU Expired - Fee Related CN215289231U (en) | 2020-04-28 | 2020-04-28 | Thread cutting driving assembly of sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215289231U (en) |
-
2020
- 2020-04-28 CN CN202020682347.XU patent/CN215289231U/en not_active Expired - Fee Related
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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: 20211224 |