CN109234929B - Thread cutting mechanism of sewing machine and sewing machine - Google Patents
Thread cutting mechanism of sewing machine and sewing machine Download PDFInfo
- Publication number
- CN109234929B CN109234929B CN201811466317.9A CN201811466317A CN109234929B CN 109234929 B CN109234929 B CN 109234929B CN 201811466317 A CN201811466317 A CN 201811466317A CN 109234929 B CN109234929 B CN 109234929B
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- shaft
- cutting
- wire cutting
- wire
- crank
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- 238000005520 cutting process Methods 0.000 title claims abstract description 281
- 238000009958 sewing Methods 0.000 title claims abstract description 45
- 230000007246 mechanism Effects 0.000 title claims abstract description 35
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 238000010008 shearing Methods 0.000 claims description 19
- 230000009471 action Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
- D05D2209/00—Use of special materials
- D05D2209/08—Use of special materials elastic, e.g. rubber spring
Abstract
The invention belongs to the technical field of sewing equipment, relates to a thread cutting mechanism of a sewing machine and the sewing machine, and solves the technical problems that the existing thread cutting mechanism is easy to be blocked and the like. The thread cutting mechanism comprises a lower shaft, a thread cutting cam, a driving shaft, a thread cutting return crank, a thread cutting shaft and a driving source component, wherein the lower shaft is rotatably arranged on a bottom plate of the sewing machine; the wire cutting cam is fixed on the lower shaft and is provided with a wire cutting section and a wire returning section, the driving shaft is parallel to the lower shaft and is movably arranged on the bottom plate, the wire cutting and returning crank is fixed on the driving shaft and is provided with a wire cutting section and a wire returning section, the wire cutting shaft is parallel to the lower shaft and is rotatably arranged on the bottom plate, the output end of the driving source assembly can slide towards the wire cutting shaft through the driving shaft, the wire cutting section and the wire returning section on the wire cutting and returning crank can be respectively contacted with the wire cutting section and the wire returning section on the wire cutting cam, the driving shaft is connected with the wire cutting shaft through the torque transmission device, and the left end of the wire cutting shaft is provided with the wire cutting and moving assembly. The invention can effectively avoid the phenomena of jamming and the like.
Description
Technical Field
The invention belongs to the technical field of sewing equipment, and relates to a thread cutting mechanism of a sewing machine and the sewing machine.
Background
In the thread cutting mechanism of the existing sewing machine, the thread cutting assembly needs to realize the following functions: switching function of the thread cutting position and the non-thread cutting position, forced reset function and the like.
As disclosed in the CN108385293a patent, the power transmission mechanism comprises a thread cutting shaft, a thread cutting driving crank, a driving shaft and a driving cam; a forced reset arm is fixed on the shear shaft; the wire cutting driving crank is sleeved on the wire cutting shaft and is in sliding connection with the wire cutting shaft through a sliding connection structure, a driving cam is fixed on the driving shaft, and the driving cam comprises a forced resetting part and a driving part; the thread cutting driving crank is contacted with the contour surface of the driving part of the driving cam when cutting threads; the forced reset part is opposite to the forced reset arm and is used for carrying out forced reset through the contact between the reset part and the reset arm when the shear shaft is not normally reset.
However, the above-described wire cutting mechanism still has the following drawbacks:
when the electromagnet drives the wire cutting driving crank to slide left and right, the iron core of the electromagnet drives the ejector pin to move, and the ejector pin is abutted against the side wall of the wire cutting driving crank so as to drive the wire cutting driving crank to slide. The side wall of the wire cutting driving crank is locally stressed, and the side wall is far away from the axis of the wire cutting shaft, so that the risk of easy clamping exists.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a thread cutting mechanism of a sewing machine, which aims to solve the technical problems that: how to reduce the risk of locking of the thread cutting mechanism and reduce the cost.
The aim of the invention can be achieved by the following technical scheme:
a thread cutting mechanism of a sewing machine, the thread cutting mechanism comprising:
the lower shaft is rotatably arranged on a bottom plate of the sewing machine;
the wire cutting cam is fixed on the lower shaft and is provided with a wire cutting section and a cutter returning section;
the driving shaft is parallel to the lower shaft, is rotatably arranged on the bottom plate and can axially slide along the driving shaft;
the wire cutting and cutter returning crank is fixed on the driving shaft and is provided with a wire cutting part and a cutter returning part which can be respectively matched with the wire cutting part and the cutter returning part on the wire cutting cam;
the shearing shaft is parallel to the lower shaft and is rotatably arranged on the bottom plate;
the driving source assembly is fixed on the bottom plate, the output end of the driving source assembly can be connected with or attached to the right end of the driving shaft, and the driving shaft is driven to slide towards the shearing shaft, so that the shearing part and the returning part on the shearing return crank can be respectively contacted with the shearing part and the returning part on the shearing cam;
a torque transmission device, through which the drive shaft is connected to the shear shaft, and which is capable of transmitting the torque of the drive shaft to the shear shaft;
and the wire cutting moving knife assembly is arranged at the left end of the wire cutting shaft.
The working principle is as follows: during normal sewing, the lower shaft can rotate under the drive of the motor of the sewing machine to complete the needed sewing action, the mechanism of the motor of the sewing machine with the lower shaft rotating is the prior art and is not repeated here, and at the moment, the cutting wire section on the cutting wire return crank is positioned on the right side of the cutting wire section of the cutting wire cam, and the driving shaft and the cutting wire shaft cannot swing; when the wire is needed to be cut, the driving source drives the driving shaft to slide towards the wire cutting shaft, the wire cutting part on the wire cutting return crank is in contact with the wire cutting part on the wire cutting cam, the rotation of the lower shaft drives the wire cutting cam to swing, and then the wire cutting return crank is driven to swing, so that the driving shaft is driven to swing, and the torque transmission device is designed between the driving shaft and the wire cutting shaft and can transmit the swing of the driving shaft to the wire cutting shaft, so that the wire cutting moving knife assembly on the wire cutting shaft moves, and the wire cutting is realized. Because the driving shaft and the shearing shaft are arranged in parallel, and the output end of the driving source component acts on the driving shaft, the driving force generated when the shearing wire cutter return crank moves acts on the axis of the driving shaft, and the phenomenon of clamping is not easy to occur. In addition, the wire cutting part and the wire returning part which can be respectively contacted with the wire cutting part and the wire returning part on the wire cutting cam are designed on the wire cutting and wire returning crank, and compared with the mode of interval design of the wire cutting driving crank and the wire returning driving crank in the prior art, the assembly process can be saved, and the installation is faster; and the structure is more simplified, and the production cost can be reduced.
In the thread cutting mechanism of the sewing machine, the torque transmission device comprises a sliding groove and a boss, the sliding groove is formed in the right end of the thread cutting shaft, the boss is fixed at the left end of the driving shaft, and the boss is inserted into the sliding groove and can slide along the axial direction of the driving shaft. When the driving source drives the driving shaft to slide towards the shearing shaft, the boss at the left end of the driving shaft can synchronously slide in the chute; when the thread cutting cam on the lower shaft drives the thread cutting return cutter crank to swing, the thread cutting return cutter crank drives the driving shaft to swing, and then torque is transmitted to the thread cutting shaft through the cooperation of the boss and the side wall of the sliding groove to drive the thread cutting shaft to swing, so that thread cutting is realized.
In the thread cutting mechanism of the sewing machine, the thread cutting return crank comprises a body, a through hole is formed in the body, and the torque transmission device is located in the through hole. The torque transmission device is designed in the through hole, and the through hole not only can play a role in guiding, but also can prevent greasy dirt and dust in the sewing machine from entering the torque transmission device to generate clamping stagnation, thereby influencing the normal transmission of torque.
In the thread cutting mechanism of the sewing machine, the left end of the driving shaft is located in the through hole, a fixing hole communicated with the through hole is formed in the side wall of the body, and a fastener capable of being fixedly matched with the driving shaft is inserted into the fixing hole.
In the thread cutting mechanism of the sewing machine, the body extends radially outwards to form the thread cutting portion and the cutter returning portion, rollers capable of being in contact with the thread cutting portions on the thread cutting cams are movably arranged on the thread cutting portion, and pin shafts capable of being in contact with the cutter returning portions on the thread cutting cams are movably arranged on the cutter returning portion. After the roller and the pin shaft are designed, the movement of the thread cutting cam and the thread cutting return crank can be smoother when the thread cutting cam is matched with the thread cutting return crank.
In the thread cutting mechanism of the sewing machine, a fixed cutter is fixed on a bottom plate of the sewing machine and is positioned at the left end of the lower shaft; the wire cutting movable cutter assembly comprises a wire cutting crank, a wire cutting connecting rod, a movable cutter frame and a movable cutter, one end of the wire cutting crank is fixedly connected with the left end of the wire cutting shaft, two ends of the wire cutting connecting rod are respectively hinged with the other end of the wire cutting crank and the movable cutter frame, and the movable cutter is fixed on the movable cutter frame. The thread cutting shaft can swing to drive the thread cutting crank to swing synchronously, and then the thread cutting connecting rod drives the moving knife rest to swing, so that the moving knife and the fixed knife are matched to realize thread cutting.
In the thread cutting mechanism of the sewing machine, the bottom plate of the sewing machine is fixedly provided with the fixing sleeve, the thread cutting shaft penetrates through the fixing sleeve, the fixing sleeve is sleeved with the reset torsion spring, and the action end of the reset torsion spring is connected with or abutted against the thread cutting crank. The thread cutting shaft swings to drive the thread cutting crank to swing and enable the movable cutter to swing around the lower shaft through the action of the thread cutting connecting rod to cut threads; after the thread is cut, the thread cutting crank can reset under the action of the reset torsion spring so as to cut the thread next time.
In the thread cutting mechanism of the sewing machine, a retainer ring is fixed at the right end of the fixed sleeve, a reset pressure spring is arranged between the retainer ring and the thread cutting return crank, and the reset pressure spring is sleeved on the thread cutting shaft; when the reset pressure spring is in a reset state, the wire cutting return crank is positioned on the right side of the wire cutting cam. When the wire is cut, the driving source overcomes the elasticity of the reset pressure spring, so that the wire cutting return crank moves leftwards and is abutted against the wire cutting cam to cut the wire; after the thread is cut, the thread cutting return crank can be reset and move rightwards under the action of the reset pressure spring and is not contacted with the thread cutting cam.
The sewing machine is characterized by comprising the thread cutting mechanism.
Compared with the prior art, the invention has the following advantages:
1. the driving shaft and the shearing shaft are arranged in parallel, and the output end of the driving source assembly acts on the driving shaft, so that the driving force generated when the shearing wire cutter return crank moves acts on the axis of the driving shaft, and the phenomenon of clamping is not easy to occur;
2. the wire cutting and cutting part and the cutting and cutting part which can be respectively contacted with the wire cutting segment and the cutting and cutting part on the wire cutting cam are designed on the wire cutting and cutting crank, and compared with the mode of interval design of the wire cutting driving crank and the cutting and cutting driving crank in the prior art, the assembly process can be saved, and the installation is faster.
Drawings
Fig. 1 is an isometric view of the present thread cutting mechanism in an embodiment.
Fig. 2 is a schematic structural view of the thread cutting mechanism according to the embodiment.
Fig. 3 is a schematic structural view of the present thread cutting mechanism in an embodiment when the thread is not cut.
Fig. 4 is a schematic diagram of the positional relationship among the components in the embodiment.
Fig. 5 is a diagram showing the cooperation between the thread cutting cam and the thread cutting return crank in the embodiment.
Fig. 6 is a schematic diagram of the structure of the present torque transmitting device in the embodiment.
Fig. 7 is a schematic structural view of the present thread cutting cam in the embodiment.
Fig. 8 is a schematic structural diagram of the present wire-cutting return crank in the embodiment.
Fig. 9 is a schematic structural view of the present shear spool in the embodiment.
Fig. 10 is a schematic view of the structure of the present drive shaft in the embodiment.
In the figure, 1, lower shaft; 2. a bottom plate; 3. a thread cutting cam; 4. cutting a line segment; 5. a cutter return section; 6. a drive shaft; 7. a wire cutting and cutter returning crank; 8. a cutter returning part; 9. cutting the spool; 10. a drive source assembly; 11. a torque transmitting device; 12. a chute; 13. a boss; 14. a body; 15. a through hole; 16. a fixing hole; 17. a roller; 18. a pin shaft; 19. a fixed cutter; 20. a wire cutting crank; 21. cutting a wire connecting rod; 22. a movable tool rest; 23. a movable knife; 24. a fixed sleeve; 25. a reset torsion spring; 26. a retainer ring; 27. resetting a pressure spring; 28. a thread cutting part; 29. and the wire cutting moving knife assembly.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, 5 and 7, the thread cutting mechanism comprises a lower shaft 1 and a thread cutting cam 3, wherein the lower shaft 1 is rotatably arranged on a bottom plate 2 of the sewing machine, the thread cutting cam 3 is fixed on the lower shaft 1, and the thread cutting cam 3 is provided with a thread cutting segment 4 and a cutter return segment 5. In this embodiment, the thread cutting cam 3 is preferably a two-piece structure, and is divided into a thread cutting body and a forced cutter returning body, which can be an integral structure or can be fixedly connected by a fastener, and in order to fix the thread cutting cam 3, a screw can be designed at the forced cutter returning body. As another solution, the thread cutting cam 3 may also have a three-piece structure, and a fixing portion for fixing with the lower shaft 1 is designed between the thread cutting body and the forced cutter back body.
As shown in fig. 1, 5 and 8, the thread cutting mechanism comprises a driving shaft 6 and a thread cutting return crank 7, wherein the driving shaft 6 is parallel to the lower shaft 1, is rotatably arranged on the bottom plate 2, and can axially slide along the bottom plate. In the embodiment, a mounting hole is formed in a bottom plate 2 of the sewing machine, and a driving shaft 6 passes through the mounting hole and is movably matched with the mounting hole; of course, if a boss or other member is provided on the base plate 2, the drive shaft 6 may be engaged with the boss. The wire cutting return crank 7 is fixed to the drive shaft 6, and has a wire cutting portion 28 and a return portion 8 that can be respectively engaged with the wire cutting segment 4 and the return segment 5 on the wire cutting cam 3. Specifically, the wire cutting and cutting return crank 7 comprises a body 14, the body 14 extends outwards along the radial direction to form a wire cutting part 28 and a return cutter part 8, a roller 17 which can be contacted with the wire cutting section 4 on the wire cutting cam 3 is movably arranged on the wire cutting part 28, and a pin shaft 18 which can be contacted with the return cutter section 5 on the wire cutting cam 3 is movably arranged on the return cutter part 8. The thread cutting and back cutting crank 7 can be designed into an integrated scheme, and the thread cutting part 28 and the back cutting part 8 can be designed into split type and fixedly connected through a fastener, so that the thread cutting and back cutting crank can be assembled in advance and then put into a sewing machine for assembly in order to improve the assembly efficiency.
As shown in fig. 1, 2 and 3, the wire cutting mechanism includes a wire cutting shaft 9 disposed parallel to the drive shaft 6, and the wire cutting shaft 9 is rotatably disposed on the base plate 2. Specifically, a fixing sleeve 24 is fixed to the bottom plate 2 of the sewing machine, and the scissor wire shaft 9 passes through the fixing sleeve 24 and is in rotary fit with the fixing sleeve.
As shown in fig. 1, 2 and 3, the thread cutting mechanism comprises a driving source assembly 10, the driving source assembly 10 is fixed on the bottom plate 2, the output end of the driving source assembly 10 can be connected with or attached to the right end of the driving shaft 6, and the driving shaft 6 is driven to slide towards the thread cutting shaft 9, so that the thread cutting part 28 and the thread returning part 8 on the thread cutting return crank 7 can be respectively contacted with the thread cutting segment 4 and the thread returning segment 5 on the thread cutting cam 3. The drive source assembly 10 may include an electromagnet, a cylinder, a linear motor, or the like. In this embodiment, an electromagnet is preferred. The spindle of the electromagnet can be directly attached to the right end of the drive shaft 6, or a connection piece can be provided between the spindle of the electromagnet and the drive shaft 6, which connection piece also belongs to a part of the drive source assembly 10. And the same is true for the cylinder and the linear motor. In addition, there are multiple matching modes between the output end of the driving source assembly 10 and the right end of the driving shaft 6, which can be in a contact state all the time, or a scheme that the output end moves left a certain distance and then contacts with the right end of the driving shaft 6, or even a scheme that the output end is connected with the driving shaft 6 can be adopted.
As shown in fig. 1, 2, 3, 6, 9, and 10, the drive shaft 6 is connected to the scissor spool 9 by a torque transmission device 11, and torque of the drive shaft 6 can be transmitted to the scissor spool 9, and the scissor blade assembly 29 is provided at the left end of the scissor spool 9. In this embodiment, the torque transmission device 11 includes a chute 12 and a boss 13, the chute 12 is disposed at the right end of the scissor shaft 9, the boss 13 is fixed at the left end of the driving shaft 6, and the boss 13 is inserted into the chute 12 and can slide along the axial direction of the driving shaft 6. It should be noted that the shape of the chute 12 is not limited to the bar shape shown in the drawings, and the cross section of the chute may be designed in various shapes such as square. The number of the sliding grooves 12 is not limited, for example, if there are two sliding grooves 12, the cross section of the sliding groove 12 can be designed into a circular shape, and two bosses 13 are matched with the sliding groove 12, so that torque transmission can be realized. In addition, if the positions of the slide groove 12 and the boss 13 are reversed, for example, the slide groove 12 is designed on the driving shaft 6, and the boss 13 is designed on the shear shaft 9. The connection mode of the boss 13 and the driving shaft 6 can be integrated, and a split scheme can be adopted.
As shown in fig. 6 and 8, the body 14 is provided with a through hole 15, and the torque transmission device 11 is located in the through hole 15. Specifically, the left end of the drive shaft 6 and the right end of the scissor spool 9 are both located in the through hole 15, the side wall of the body 14 is provided with a fixing hole 16 communicated with the through hole 15, and a fastener capable of being fixedly matched with the drive shaft 6 is inserted into the fixing hole 16. The fastener may be a screw, and the drive shaft 6 may be provided with a threaded hole to which the screw can be connected. Of course, as other solutions, the fastener may be a pin.
As shown in fig. 1, 2 and 3, the wire cutting mechanism includes a wire cutting movable blade assembly 29. Specifically, a fixed knife 19 is fixed on the bottom plate 2 of the sewing machine, and the fixed knife 19 is positioned at the left end of the lower shaft 1; the thread cutting movable cutter assembly 29 comprises a thread cutting crank 20, a thread cutting connecting rod 21, a movable cutter frame 22 and a movable cutter 23, one end of the thread cutting crank 20 is fixedly connected with the left end of the thread cutting shaft 9, two ends of the thread cutting connecting rod 21 are respectively hinged with the other end of the thread cutting crank 20 and the movable cutter frame 22, and the movable cutter 23 is fixed on the movable cutter frame 22. As other schemes, the fixed knife 19 can be omitted, the thread cutting moving knife assembly 29 is designed into two sets of moving knives 23, thread cutting connecting rods 21 and thread cutting cranks 20 which can swing around the lower shaft 1, and the corresponding thread cutting cranks 20, the thread cutting connecting rods 21 and the thread cutting moving knives 23 are driven to move through the swing of the lower shaft 1, so that thread cutting is realized.
In order to realize the reset, as shown in fig. 1, 2 and 3, a reset torsion spring 25 is sleeved on the fixing sleeve 24, and the acting end of the reset torsion spring 25 is connected with or abutted against the wire cutting crank 20. A retainer ring 26 is fixed at the right end of the fixed sleeve 24, a reset pressure spring 27 is arranged between the retainer ring 26 and the wire cutting and back knife crank 7, and the reset pressure spring 27 is sleeved on the wire cutting shaft 9; when the reset pressure spring 27 is in a reset state, the wire cutting return crank 7 is positioned on the right side of the wire cutting cam 3.
In order to avoid interference between the components in the wire cutting process, as shown in fig. 4, when the driving source component 10 is completely absorbed, L0 is the maximum stroke of the driving source component 10, L1 is the distance between the driving shaft 6 and the end face of the wire cutting shaft 9, L2 is the length of the boss 13 on the driving shaft 6, if other connection modes are replaced, the size of the boss 13 is just required, L3 is the distance from the end face of the pin shaft 18 to the end face of the wire cutting cam 3, L4 is the effective length of the pin shaft 18, wherein L1 is greater than 0, the wire cutting shaft 9 is ensured not to collide with the driving shaft 6, L2 is greater than l0+l1, the driving shaft 6 and the wire cutting shaft 9 are ensured to be contacted at any time, L3 is greater than 0, the pin shaft 18 is ensured to be always contacted with the wire cutting cam 3, wherein L4 is greater than l0+l3, and the wire cutting return crank 7 is ensured not to collide with the wire cutting cam 3.
As shown in fig. 5, at the moment of cutting, that is, when the cutting cam 3 lifts the roller 17 to reach the limit point, the pin 18 is spaced from the return section 5 of the cutting cam 3 by a distance m, where m is greater than 0, and if the cutting is completed and the return is not performed, that is, the return torsion spring 25 fails to return the cutting crank 20, the return section 5 of the cutting cam 3 contacts with the pin 18 and swings the cutting return crank 7, and finally resets the cutting movable cutter assembly 29 through motion transmission.
The invention also provides a sewing machine comprising the thread cutting mechanism.
The working principle of the invention is as follows: during normal sewing, the lower shaft 1 can rotate under the drive of a motor of a sewing machine to complete the needed sewing action, and at the moment, the cutting wire section 4 on the cutting wire return crank 7 is positioned on the right side of the cutting wire section 4 of the cutting wire cam 3, and the driving shaft 6 and the cutting wire shaft 9 cannot swing; when the wire needs to be cut, the driving source drives the driving shaft 6 to slide towards the wire cutting shaft 9, so that the wire cutting part 28 on the wire cutting return crank 7 is in contact with the wire cutting part 4 on the wire cutting cam 3, the rotation of the lower shaft 1 drives the wire cutting cam 3 to swing, and then drives the wire cutting return crank 7 to swing, so that the driving shaft 6 is driven to swing, and the torque transmission device 11 is designed between the driving shaft 6 and the wire cutting shaft 9, so that the swing of the driving shaft 6 can be transmitted to the wire cutting shaft 9, and the wire cutting moving knife assembly 29 on the wire cutting shaft 9 moves, so that the wire cutting is realized.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (3)
1. A thread cutting mechanism of a sewing machine, the thread cutting mechanism comprising: the lower shaft (1) is rotatably arranged on a bottom plate (2) of the sewing machine;
the wire cutting cam (3), the wire cutting cam (3) is fixed on the lower shaft (1), and the wire cutting cam (3) is provided with a wire cutting section (4) and a cutter returning section (5);
the driving shaft (6) is parallel to the lower shaft (1), is rotatably arranged on the bottom plate (2) and can axially slide along the driving shaft (6);
a wire cutting and returning crank (7), wherein the wire cutting and returning crank (7) is fixed on the driving shaft (6) and is provided with a wire cutting part (28) and a returning part (8) which can be respectively matched with the wire cutting section (4) and the returning section (5) on the wire cutting cam (3);
the shearing shaft (9) is parallel to the lower shaft (1) and is rotatably arranged on the bottom plate (2);
the driving source assembly (10), the driving source assembly (10) is fixed on the bottom plate (2), the output end of the driving source assembly (10) can be connected with or attached to the right end of the driving shaft (6), and the driving shaft (6) is driven to slide towards the shearing shaft (9) so that the shearing part (28) and the returning part (8) on the shearing return crank (7) can be respectively contacted with the shearing section (4) and the returning section (5) on the shearing cam (3);
a torque transmission device (11), wherein the driving shaft (6) is connected with the shearing shaft (9) through the torque transmission device (11) and can transmit the torque of the driving shaft (6) to the shearing shaft (9);
the wire cutting movable cutter assembly (29), and the wire cutting movable cutter assembly (29) is arranged at the left end of the wire cutting shaft (9);
the torque transmission device (11) comprises a sliding groove (12) and a boss (13), the sliding groove (12) is arranged at the right end of the shear shaft (9), the boss (13) is fixed at the left end of the driving shaft (6), and the boss (13) is inserted into the sliding groove (12) and can slide along the axial direction of the driving shaft (6);
the wire cutting and back cutting crank (7) comprises a body (14), a through hole (15) is formed in the body (14), and the torque transmission device (11) is located in the through hole (15); the left end of the driving shaft (6) is positioned in the through hole (15), a fixing hole (16) communicated with the through hole (15) is formed in the side wall of the body (14), and a fastener capable of being fixedly matched with the driving shaft (6) is inserted into the fixing hole (16);
the body (14) extends outwards along the radial direction to form the thread cutting part (28) and the cutter return part (8), a roller (17) which can be contacted with the thread cutting part (4) on the thread cutting cam (3) is movably arranged on the thread cutting part (28), and a pin shaft (18) which can be contacted with the cutter return part (5) on the thread cutting cam (3) is movably arranged on the cutter return part (8);
a fixed knife (19) is fixed on a bottom plate (2) of the sewing machine, and the fixed knife (19) is positioned at the left end of the lower shaft (1); the wire cutting movable cutter assembly (29) comprises a wire cutting crank (20), a wire cutting connecting rod (21), a movable cutter holder (22) and a movable cutter (23), one end of the wire cutting crank (20) is fixedly connected with the left end of the wire cutting shaft (9), two ends of the wire cutting connecting rod (21) are respectively hinged with the other end of the wire cutting crank (20) and the movable cutter holder (22), and the movable cutter (23) is fixed on the movable cutter holder (22);
a fixed sleeve (24) is fixed on a bottom plate (2) of the sewing machine, the thread cutting shaft (9) penetrates through the fixed sleeve (24), a reset torsion spring (25) is sleeved on the fixed sleeve (24), and the acting end of the reset torsion spring (25) is connected with or abutted against the thread cutting crank (20).
2. The thread cutting mechanism of the sewing machine according to claim 1, wherein a retainer ring (26) is fixed at the right end of the fixed sleeve (24), a reset pressure spring (27) is arranged between the retainer ring (26) and the thread cutting return crank (7), and the reset pressure spring (27) is sleeved on the thread cutting shaft (9); when the reset pressure spring (27) is in a reset state, the wire cutting and cutting back crank (7) is positioned on the right side of the wire cutting cam (3).
3. A sewing machine, characterized in that it comprises a thread cutting mechanism according to any one of claims 1-2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811466317.9A CN109234929B (en) | 2018-12-03 | 2018-12-03 | Thread cutting mechanism of sewing machine and sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811466317.9A CN109234929B (en) | 2018-12-03 | 2018-12-03 | Thread cutting mechanism of sewing machine and sewing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109234929A CN109234929A (en) | 2019-01-18 |
| CN109234929B true CN109234929B (en) | 2024-04-09 |
Family
ID=65074454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811466317.9A Active CN109234929B (en) | 2018-12-03 | 2018-12-03 | Thread cutting mechanism of sewing machine and sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109234929B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110130012B (en) * | 2019-07-01 | 2021-03-30 | 浙江龙泰缝纫设备有限公司 | Thread cutting device of sewing machine |
| CN114687082B (en) * | 2020-12-31 | 2023-05-26 | 杰克科技股份有限公司 | Sewing machine and thread cutting method thereof |
| 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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| JPH0975575A (en) * | 1995-09-13 | 1997-03-25 | Tokai Ind Sewing Mach Co Ltd | Thread cutting device of sewing machine |
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| CN209243337U (en) * | 2018-12-03 | 2019-08-13 | 浙江美机缝纫机有限公司 | A kind of thread cutting mechanism and sewing machine of sewing machine |
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