CN107142624B - Sewing machine and thread trimming mechanism thereof - Google Patents
Sewing machine and thread trimming mechanism thereof Download PDFInfo
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- CN107142624B CN107142624B CN201710544788.6A CN201710544788A CN107142624B CN 107142624 B CN107142624 B CN 107142624B CN 201710544788 A CN201710544788 A CN 201710544788A CN 107142624 B CN107142624 B CN 107142624B
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- gear
- sewing machine
- thread trimming
- pushing
- push plate
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a thread trimming mechanism of a sewing machine and the sewing machine comprising the thread trimming mechanism. The fixed knife of the thread cutting mechanism is fixed on the shell of the sewing machine; the power mechanism is a lower shaft of the sewing machine, and a rotating piece is fixed on the lower shaft; the movable knife is arranged on the movable knife rest which is rotatably arranged in the shell of the sewing machine; the transmission mechanism comprises a first gear, a second gear, a crank and a connecting rod; the gear is sleeved on the lower shaft, is positioned on one side of the rotating part and can rotate relative to the lower shaft; the external teeth of the first gear are meshed with the external teeth of the second gear, the crank is connected with the second gear through a crank shaft, one end of the connecting rod is connected with the crank, and the other end of the connecting rod is connected with the movable tool rest; and the first gear and the rotating part are correspondingly provided with matched joint structures for mutual joint and separation under the action of a clutch mechanism. The thread trimming mechanism is simple in structure, low in cost and good in stability.
Description
Technical Field
The invention relates to a sewing machine, in particular to a thread trimming mechanism of the sewing machine.
Background
The sewing machine needs to cut the thread after finishing one sewing operation, namely, the thread connected between the needle and the sewing material is cut. The conventional sewing machine does not have a thread trimming function, and an operator needs to use scissors and the like to complete thread trimming operation. Aiming at the inconvenience of manual thread trimming, research and development personnel add a thread trimming function on the sewing machine. The thread trimming mechanism comprises a fixed cutter fixedly arranged on a machine shell and a movable cutter capable of reciprocating rotation. The working principle is as follows: when the thread cutting is needed, a driving device (such as an electromagnet, a pneumatic cylinder and the like) drives a clutch to connect a thread cutting mechanism with a lower shaft of the sewing machine, the motion of the lower shaft is transmitted to a thread cutting driving assembly according to a certain time sequence relation through a cam with a specific shape arranged on the lower shaft of the sewing machine, and the thread cutting driving assembly drives a movable cutter to be meshed with a fixed cutter to cut the thread. After finishing the thread trimming action, the thread trimming driving component is reset to the original position under the action of a cam or a spring and the like to prepare for next thread trimming. The thread cutting mechanism performs thread cutting operation repeatedly.
The above-described thread trimming mechanism, however, has some drawbacks, such as: the thread trimming mechanism needs a cam part with a complex track, and the accuracy of the cam track has great influence on the reliability of the thread trimming function; the cam and the trimming driving component which are matched with each other contain more parts and have complex structures.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a thread trimming mechanism for a sewing machine and a sewing machine including the thread trimming mechanism, so as to simplify the structure of the thread trimming mechanism and improve the reliability of the thread trimming function.
In order to achieve the above and other related objects, in one embodiment, the present invention provides a thread trimming mechanism for a sewing machine, including a stationary knife, a movable knife, a power mechanism, a transmission mechanism and a clutch mechanism; the fixed knife is fixed on the sewing machine shell; the power mechanism is a lower shaft of the sewing machine, and a rotating piece is fixed on the lower shaft; the movable knife is arranged on the movable knife rest, and the movable knife rest is rotatably arranged in the sewing machine shell; the transmission mechanism comprises a first gear, a second gear, a crank and a connecting rod; the gear is sleeved on the lower shaft, is positioned on one side of the rotating part and can rotate relative to the lower shaft; the external teeth of the first gear are meshed with the external teeth of the second gear, the crank is connected with the second gear through a crank shaft, one end of the connecting rod is connected with the crank, and the other end of the connecting rod is connected with the movable tool rest; and the first gear and the rotating part are correspondingly provided with matched joint structures for mutual joint and separation under the action of a clutch mechanism.
In one embodiment, the movable tool holder is rotatably arranged on the shaft sleeve of the lower shaft.
In one embodiment, the clutch mechanism comprises a driving device and a clutch, the driving device drives the clutch to move back and forth along the lower shaft, and the clutch drives the gear to be engaged with and disengaged from the rotating part.
In one embodiment, the driving means is an electromagnet, a pneumatic cylinder, a hydraulic cylinder or an electric motor.
In one embodiment, the clutch is a shifting fork, one end of the shifting fork is a fork head and is connected with the first gear, and the other end of the shifting fork is connected with the driving device and is used for driving the first gear to be connected with and separated from the rotating part under the driving of the driving device.
In one embodiment, the clutch comprises a push plate and a return spring, wherein one end of the push plate is connected with the driving device, the other end of the push plate is positioned on one side of the first gear, which is opposite to the rotating part, and used for pushing the first gear to be jointed with the rotating part, and the return spring is used for separating the first gear from the rotating part.
In one embodiment, the engaging structure includes a pushing pin and a pushing portion provided on the first gear and the rotating member, respectively, the pushing pin extending in the axial direction from the first gear to the rotating member or extending in the axial direction from the rotating member to the first gear, and correspondingly, the pushing portion extending radially outward from the rotating member or the first gear such that the first gear rotates synchronously with the rotating member due to contact of the pushing portion and the pushing pin when the first gear is engaged with the rotating member.
In one embodiment, the clutch comprises a push plate, one end of the push plate is connected with the driving device, the other end of the push plate is positioned on one side of the first gear, which is opposite to the rotating part, the joint structure comprises an axial pin hole arranged on the first gear, a pushing pin is movably arranged in the pin hole, one end of the pushing pin penetrates through the pin hole and is positioned between the push plate and the first gear, a pushing part extends out from the rotating part in the radial direction, and when the first gear is jointed with the rotating part, the push plate pushes the pushing pin to the rotating part, so that the pushing pin is contacted with the pushing part, and the first gear synchronously rotates along with the; and a return spring which is connected with the pushing pin and is used for returning the pushing pin is arranged between the first gear and the push plate.
In one embodiment, the invention also provides a sewing machine, which comprises any one of the sewing machine thread cutting mechanisms.
As described above, one or more embodiments of the present invention have the following advantageous effects: through replacing cam and trimming drive assembly matched with form among the prior art with gear pair and crank connecting rod structure, make trimming mechanism's structure simpler, the cost is lower, and stability is better, makes the trimming function more reliable when reaching the trimming effect.
Drawings
FIG. 1 is a schematic structural view showing one embodiment of a thread trimming mechanism of a sewing machine according to the present invention.
Description of the element reference numerals
1 case
2 moving knife
3 fixed knife
4 move the tool post
5 knife rest pressing plate
6 lower shaft front shaft sleeve
7 lower shaft
8 cam
9 gear one
10 shifting fork
11 nut
12 connecting rod
13 crank
14 crank axle sleeve
15 gear two
16 electromagnetic iron core
17 electromagnet support
18 electromagnet
19 spring
20 push pin
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not technically significant, and any structural modifications, ratio changes or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The thread trimming mechanism of the sewing machine mainly comprises a movable cutter, a fixed cutter, a power mechanism for providing power for the rotation of the movable cutter, a transmission mechanism for transmitting the power of the power mechanism to the movable cutter and enabling the movable cutter to generate reciprocating rotation, and a clutch mechanism for enabling the transmission mechanism and the power mechanism to be jointed and separated. Here, engagement means that a power transmitting relationship is established between two mechanical structures, and disengagement means that the power transmitting relationship is disengaged. Wherein, the power mechanism is a lower shaft of the sewing machine, and a rotating part which rotates synchronously with the lower shaft is fixed on the lower shaft; the clutch mechanism comprises a driving device and a clutch.
FIG. 1 shows an embodiment of a thread trimming mechanism of a sewing machine of the present invention.
In this embodiment, the power mechanism is a lower shaft 7 of the sewing machine and provides power for the rotation of the movable knife.
As shown in fig. 1, the fixed knife 3 is fixed on the machine shell 1 of the sewing machine, the movable knife 2 is installed on the movable knife rest 4, the movable knife rest 4 is sleeved on the lower shaft front shaft sleeve 6 of the lower shaft 7, and the movable knife rest 4 can rotate relative to the lower shaft front shaft sleeve 6. The knife rest pressing plate 5 limits the moving knife rest 4 on the lower shaft front shaft sleeve 6. Although the movable blade holder 4 of the present embodiment takes the form of the lower shaft front bushing 6 as a rotating shaft, in other embodiments, other shafts, such as a shaft separately provided as a rotating shaft, or a shaft rotatably provided in other manners in the housing 1, may be used.
As shown in fig. 1, in the present embodiment, the rotating component on the lower shaft is specifically a cam 8, and the transmission mechanism specifically includes a first gear 9, a second gear 15, a crank 13 and a connecting rod 12. The cam 8 is fixed on the lower shaft 7 and can rotate synchronously with the lower shaft 7, and the first gear 9 is sleeved on the lower shaft 7 and is positioned at one side of the cam 8, but the first gear 9 can rotate relative to the lower shaft 7, namely, the first gear 9 does not rotate along with the rotation of the lower shaft 7 when not engaged with the cam 8. The external teeth of the first gear 9 are meshed with the external teeth of the second gear 15. The crank 13 is connected to one end of the connecting rod 12 to form a crank link mechanism. The other end of the connecting rod 12 is connected to the movable blade holder 4. The crank 13 is connected to a second gear 15 via a crank shaft which passes through a crank sleeve 14 fixed to the housing 1.
As shown in fig. 1, the clutch mechanism of the present embodiment specifically includes a shift fork 10 and an electromagnet 18, wherein the electromagnet 18 is a driving device, and the shift fork 10 is a clutch. An electromagnet bracket 17 is arranged on the machine shell 1, and an electromagnet 18 is arranged on the electromagnet bracket 17. One end of an electromagnetic iron core 16 in the electromagnet 18 is connected with a shifting fork 10, a nut 11 is used for fixing the shifting fork 10 on the electromagnetic iron core 16 in a threaded connection mode, the other end of the electromagnetic iron core is connected with a spring 19, and the spring 19 is used for resetting the electromagnetic iron core 16. The fork of the fork 10 is connected to the first gear 9, for example, the fork of the fork 10 is disposed in a slot (not shown) on the first gear 9, or any other connection that can be connected to the first gear without hindering rotation of the first gear. The first gear 9 and the cam 8 are correspondingly provided with matched engagement structures for mutual engagement and disengagement under the action of the clutch mechanism. In the embodiment shown in fig. 1, the first gear 9 is provided with an axial pushing pin 20, and the cam 8 is provided with a corresponding radial pushing portion, which may be provided on the outer circumference of the cam 8 or may protrude from one side thereof and extend radially. Under the state that the first gear 9 is separated from the cam 8, the pushing pin 20 is not contacted with the pushing part, the first gear 9 does not rotate along with the rotation of the cam 8, and under the state that the first gear 9 is jointed with the cam 8, along with the rotation of the cam 8, the pushing part is contacted with the pushing pin 20 to push the pushing pin 20, so that the first gear 9 and the cam 8 are driven to synchronously rotate. In other embodiments, the pushing pin can be arranged on the cam, the pushing part is arranged on the first gear, and the pushing part is driven by the pushing pin.
The operation of the thread trimming mechanism will now be described on the basis of the embodiment shown in fig. 1. When the thread cutting is not needed, the first gear 9 and the cam 8 are separated from each other, and the first gear 9 does not rotate along with the rotation of the lower shaft 7. When a thread is required to be cut, the control system sends a thread cutting instruction, the electromagnet 18 is started, the electromagnet core 16 pushes the shifting fork 10 to move forwards along the lower shaft 7, the shifting fork 10 pushes the first gear 9 to be jointed with the cam 8, the pushing part pushes the pushing pin 20 to enable the first gear 9 to rotate along with the lower shaft 7 under the driving of the cam 8, the first gear 9 further drives the second gear 15 to rotate, the second gear 15 drives the crank 13 to rotate, so that the connecting rod 12 is driven to reciprocate, the reciprocating motion of the connecting rod 12 drives the movable knife rest 4 and the movable knife 2 to reciprocate, and the thread cutting action is completed by matching with the fixed knife 3 in the rotating process. After the thread trimming is finished, the movable knife 2 returns to the initial position under the driving of the connecting rod 12, the electromagnetic iron core 16 resets to drive the shifting fork 10 to reset, and then the first gear 9 is driven to be separated from the cam 8 to wait for the next thread trimming operation.
It should be further noted that although the embodiment shown in fig. 1 employs an electromagnet as the driving device and a fork as the clutch, those skilled in the art will appreciate that any other suitable driving device and clutch may be used instead of the above-mentioned options. Also, the first gear-to-cam engagement structure is not limited to the foregoing embodiment. For example, the drive means may be replaced by an electromagnet with a pneumatic cylinder, a hydraulic cylinder, or an electric motor, etc. The clutch may have a structure in which a shift fork is replaced with a push plate disposed at one side of the first gear to push the first gear to engage with the cam, and a return spring is disposed between the first gear and the cam to separate the first gear from the cam after trimming is completed by returning of the compression spring.
For another example, the following may be used for the engagement of gear one with the cam: the axial pin hole is formed in the first gear, the pushing pin is movably arranged in the pin hole, one end of the pushing pin penetrates through the pin hole, one end of the pushing pin between the first gear and the push plate is connected with the reset spring, for example, the spring is sleeved on the pushing pin, the spring and the end, close to the push plate, of the pushing pin are fixedly connected with each other, two ends of the spring respectively abut against the push plate and the first gear, after trimming is completed, the pushing pin can be reset under the action of the reset spring along with resetting of the push plate, and the first gear is separated from the cam. As in the embodiment of fig. 1, the cam is provided with a radial pushing portion for contacting the pushing pin when the pushing pin is pushed toward the cam through the pin hole by the push plate to push the gear to rotate with the cam. In this case, since the first gear does not need to move along the lower shaft, the return spring between the first gear and the cam can be omitted, as is the case with the tension spring.
In summary, in the above embodiments of the present invention, the gear and crank connecting rod structure is used to replace the cam and the thread trimming driving assembly in the prior art, so that the thread trimming mechanism has a simpler structure, lower cost and better stability, and the thread trimming operation is implemented by reciprocating swing, so that the thread clamped between the movable knife and the fixed knife can be taken out after the thread trimming is completed, thereby preventing the thread clamping phenomenon from occurring, and achieving the thread trimming effect and more reliable thread trimming function.
Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. The utility model provides a sewing machine thread trimming mechanism, includes stationary knife, moves sword, power unit, drive mechanism and clutching mechanism, its characterized in that:
the fixed knife is fixed on the sewing machine shell;
the power mechanism is a lower shaft of the sewing machine, and a rotating piece is fixed on the lower shaft;
the movable knife is arranged on the movable knife rest, and the movable knife rest is rotatably arranged in the sewing machine shell;
the transmission mechanism comprises a first gear, a second gear, a crank and a connecting rod; the gear is sleeved on the lower shaft, is positioned on one side of the rotating part and can rotate relative to the lower shaft; the external teeth of the first gear are meshed with the external teeth of the second gear, the crank is connected with the second gear through a crank shaft, one end of the connecting rod is connected with the crank, and the other end of the connecting rod is connected with the movable tool rest;
the first gear and the rotating part are correspondingly provided with matched joint structures for mutual joint and separation under the action of the clutch mechanism, and the first gear is meshed with the second gear in both the joint state and the separation state of the first gear and the rotating part.
2. The thread trimming mechanism of a sewing machine according to claim 1, wherein: the movable cutter frame is rotatably arranged on the shaft sleeve of the lower shaft.
3. The thread trimming mechanism of a sewing machine according to claim 1, wherein: the clutch mechanism comprises a driving device and a clutch, the driving device drives the clutch to move back and forth along the lower shaft, and the clutch drives the first gear to be connected with and separated from the rotating part.
4. The thread trimming mechanism of a sewing machine according to claim 3, wherein: the driving device is an electromagnet, a pneumatic cylinder, a hydraulic cylinder or an electric motor.
5. The thread trimming mechanism of a sewing machine according to claim 3, wherein: the clutch is a shifting fork, one end of the shifting fork is a fork head and is connected with the first gear, and the other end of the shifting fork is connected with the driving device and is used for driving the first gear to be connected with and separated from the rotating part under the driving of the driving device.
6. The thread trimming mechanism of a sewing machine according to claim 3, wherein: the clutch comprises a push plate and a return spring, one end of the push plate is connected with the driving device, the other end of the push plate is located on one side, back to the rotating piece, of the first gear, the other end of the push plate is used for pushing the first gear to be connected with the rotating piece, and the return spring is used for separating the first gear from the rotating piece.
7. The thread trimming mechanism of a sewing machine according to any one of claims 1 to 6, wherein: the engaging structure includes a pushing pin and a pushing portion provided on the first gear and the rotating member, respectively, the pushing pin extending from the first gear to the rotating member in the axial direction or extending from the rotating member to the first gear in the axial direction, and correspondingly, the pushing portion extending radially outward from the rotating member or the first gear such that the first gear rotates synchronously with the rotating member due to contact of the pushing portion and the pushing pin when the first gear is engaged with the rotating member.
8. The thread trimming mechanism of a sewing machine according to claim 3, wherein: the clutch comprises a push plate, one end of the push plate is connected with the driving device, the other end of the push plate is positioned on one side, back to the rotating part, of the first gear, the joint structure comprises an axial pin hole formed in the first gear, a pushing pin is movably arranged in the pin hole, one end of the pushing pin penetrates through the pin hole and is positioned between the push plate and the first gear, a pushing part extends out of the rotating part in the radial direction, and when the first gear is jointed with the rotating part, the push plate pushes the pushing pin towards the rotating part, so that the pushing pin is contacted with the pushing part, and the first gear rotates synchronously along with the rotating; and a return spring which is connected with the pushing pin and is used for returning the pushing pin is arranged between the first gear and the push plate.
9. A sewing machine characterized by: the sewing machine comprising a thread trimming mechanism according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710544788.6A CN107142624B (en) | 2017-07-06 | 2017-07-06 | Sewing machine and thread trimming mechanism thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710544788.6A CN107142624B (en) | 2017-07-06 | 2017-07-06 | Sewing machine and thread trimming mechanism thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107142624A CN107142624A (en) | 2017-09-08 |
| CN107142624B true CN107142624B (en) | 2020-10-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710544788.6A Active CN107142624B (en) | 2017-07-06 | 2017-07-06 | Sewing machine and thread trimming mechanism thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107142624B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007175254A (en) * | 2005-12-27 | 2007-07-12 | Janome Sewing Mach Co Ltd | Thread-cutting sewing machine |
| CN201021468Y (en) * | 2007-02-07 | 2008-02-13 | 俞巧萍 | Automatic line-cutting machine with digital control plane sewer |
| CN101519834A (en) * | 2009-03-16 | 2009-09-02 | 中捷缝纫机股份有限公司 | Trimming, pressure-lifting and linear-sweeping drive mechanism in sewing machine |
| CN203754982U (en) * | 2014-01-24 | 2014-08-06 | 新杰克缝纫机股份有限公司 | Sewing machine trimming knife rest structure |
| CN106283420A (en) * | 2016-10-26 | 2017-01-04 | 杰克缝纫机股份有限公司 | A kind of thread cutting method of sewing machine |
| CN106283421A (en) * | 2016-10-26 | 2017-01-04 | 杰克缝纫机股份有限公司 | A kind of sewing machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105420947A (en) * | 2015-12-21 | 2016-03-23 | 拓卡奔马机电科技有限公司 | Thread cutting mechanism of sewing machine |
-
2017
- 2017-07-06 CN CN201710544788.6A patent/CN107142624B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007175254A (en) * | 2005-12-27 | 2007-07-12 | Janome Sewing Mach Co Ltd | Thread-cutting sewing machine |
| CN201021468Y (en) * | 2007-02-07 | 2008-02-13 | 俞巧萍 | Automatic line-cutting machine with digital control plane sewer |
| CN101519834A (en) * | 2009-03-16 | 2009-09-02 | 中捷缝纫机股份有限公司 | Trimming, pressure-lifting and linear-sweeping drive mechanism in sewing machine |
| CN203754982U (en) * | 2014-01-24 | 2014-08-06 | 新杰克缝纫机股份有限公司 | Sewing machine trimming knife rest structure |
| CN106283420A (en) * | 2016-10-26 | 2017-01-04 | 杰克缝纫机股份有限公司 | A kind of thread cutting method of sewing machine |
| CN106283421A (en) * | 2016-10-26 | 2017-01-04 | 杰克缝纫机股份有限公司 | A kind of sewing machine |
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| CN107142624A (en) | 2017-09-08 |
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