CN109295622B - Automatic thread trimming mechanism of sewing machine and sewing machine - Google Patents
Automatic thread trimming mechanism of sewing machine and sewing machine Download PDFInfo
- Publication number
- CN109295622B CN109295622B CN201811467364.5A CN201811467364A CN109295622B CN 109295622 B CN109295622 B CN 109295622B CN 201811467364 A CN201811467364 A CN 201811467364A CN 109295622 B CN109295622 B CN 109295622B
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- Prior art keywords
- thread cutting
- shaft
- crank
- sewing machine
- cutting
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Classifications
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- 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
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/02—Mechanical drives
Abstract
The invention belongs to the technical field of sewing equipment, relates to an automatic thread cutting mechanism of a sewing machine and the sewing machine, and solves the technical problems that the existing automatic thread cutting mechanism is easy to be blocked and the like. The automatic thread cutting mechanism comprises a lower shaft and a thread cutting shaft which are parallel to each other, wherein the lower shaft is rotatably arranged on a bottom plate of a sewing machine, the lower shaft is fixedly provided with a thread cutting cam, and the thread cutting cam is provided with a thread cutting section and a forced cutter returning section; the shear spool is rotatably arranged on the bottom plate, a forced cutter return crank is fixed on the shear spool, and a boss is arranged on the forced cutter return crank; the thread cutting shaft is also sleeved with a thread cutting driving crank, the thread cutting driving crank is provided with a chute, and the boss is in sliding connection with the chute; the left end of the thread cutting shaft is also connected with a thread cutting moving knife assembly, the right end of the thread cutting shaft is sleeved with a transmission plate in a sliding manner, and a driving source capable of driving the transmission plate to slide towards the thread cutting driving crank is fixed on a bottom plate of the sewing machine. 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 an automatic 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 CN 108385293A patent, a thread cutting driving assembly, a thread cutting mechanism and a sewing machine, 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.
The specific structure of the sliding connection of the wire cutting driving crank and the wire cutting shaft is as follows: as described in paragraph 52 of the above patent specification, the right side of the fixed sleeve is provided with an axial slot, and the wire cutting drive crank is provided with a sliding pin which is slidably engaged with the axial slot, thereby achieving sliding coupling of the wire cutting shaft. As another alternative, as described in paragraphs 57 and 58 of the above patent specification, the sliding pin may be slidably engaged with the axial slot, or may be disposed on the fixed sleeve or the reset arm in a planar-planar engagement manner, and the shear driving crank may be correspondingly provided with the axial slot.
However, the above-described wire cutting mechanism still has the following drawbacks:
1. because the assembly space in the sewing machine is smaller, and the power transmission mechanism needs to be sleeved on the right side of the fixed sleeve when being installed, then the thread cutting driving crank is sleeved on the thread cutting shaft, and the sliding pin on the thread cutting driving crank penetrates through the reset spring to be inserted into the axial groove on the right side of the fixed sleeve, the reset spring not only can influence the assembly sight, but also can lead the assembly space to be smaller, thereby improving the assembly difficulty and reducing the assembly efficiency;
2. when the electromagnet in the patent 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 at solving the problems in the prior art, and provides an automatic thread cutting mechanism of a sewing machine, which aims at solving the technical problems that: how to reduce the risk of locking the wire cutting driving crank and reduce the cost.
The aim of the invention can be achieved by the following technical scheme:
the automatic thread cutting mechanism of the sewing machine is characterized by comprising a lower shaft and a thread cutting shaft which are parallel to each other, wherein the lower shaft is rotatably arranged on a bottom plate of the sewing machine, a thread cutting cam is fixed on the lower shaft, and the outer circumferential surface of the thread cutting cam is provided with a thread cutting segment and a forced cutter returning segment; the shearing shaft is rotatably arranged on a bottom plate of the sewing machine, a forced cutter returning crank capable of being abutted against the forced cutter returning section of the shearing cam is fixed on the shearing shaft, and a boss protruding along the radial direction is arranged on the forced cutter returning crank; the thread cutting drive crank is sleeved on the thread cutting shaft and is in sliding fit with the thread cutting drive crank, a sliding groove parallel to the thread cutting shaft is formed in the thread cutting drive crank, and a boss of the forced cutter returning crank is in sliding connection with the sliding groove; the left end of the thread cutting shaft is also connected with a thread cutting movable cutter assembly, the right end of the thread cutting shaft is sleeved with a transmission plate and is in sliding fit with the transmission plate, a driving source capable of driving the transmission plate to slide towards the thread cutting driving crank is fixed on a bottom plate of the sewing machine, and the transmission plate can drive the thread cutting driving crank to slide along the axial direction, so that the end part of the thread cutting driving crank is contacted with a thread cutting section of the thread cutting cam.
The working principle is as follows: during normal sewing, the lower shaft of the sewing machine rotates, and the thread cutting cam on the lower shaft always rotates but does not contact with the thread cutting driving crank on the thread cutting shaft, so that the thread cutting shaft does not swing, and further the thread cutting is not performed in response to the thread cutting moving knife assembly; when the wire is needed to be cut, the driving source drives the transmission plate to slide towards the wire cutting driving crank, so that the wire cutting driving crank is driven to slide along the axial direction, the end part of the wire cutting driving crank is enabled to be in contact with the wire cutting part of the wire cutting cam, the rotating wire cutting cam can drive the wire cutting driving crank to swing, and then the forced cutter returning crank is driven to swing through the cooperation of the sliding groove and the boss, so that the wire cutting shaft swings synchronously, and finally the movable cutter at the end part of the wire cutting shaft is driven to swing to cut the wire. Because the transmission plate is arranged on the thread cutting shaft, when the transmission plate is abutted against the thread cutting driving crank, the stress area of the thread cutting driving crank is larger and uniform and is approximately symmetrical about the axis of the thread cutting shaft, so that the thread cutting driving crank is not easy to be blocked when sliding; compared with the prior art, the mechanism has the advantages that the parts are simpler, and the production cost can be reduced.
In the automatic thread cutting mechanism of the sewing machine, the bottom plate is provided with the strip-shaped groove parallel to the thread cutting shaft, the transmission plate comprises the vertical sliding part and the pushing part which are fixedly connected, the sliding part is in sliding connection with the strip-shaped groove, the pushing part is provided with the first through hole, the thread cutting shaft penetrates through the first through hole and is not contacted with the first through hole, and the sliding part can enable the pushing part to be abutted to the thread cutting driving crank by sliding along the strip-shaped groove. The driving device is provided with the strip-shaped groove and the sliding part, the pushing part is not contacted with the shearing shaft, the sliding direction of the sliding part is parallel to the axial direction of the shearing shaft, the phenomenon that the driving plate is blocked when sliding is avoided, and the pushing part is provided with a larger stress area when being attached to the shearing driving crank.
In the automatic thread cutting mechanism of a sewing machine, as an aspect, the driving source is provided with a spindle capable of moving in an axial direction, and an end portion of the spindle is provided with a connecting piece capable of being abutted against the transmission plate. The mandrel can drive the connecting piece to move, and then the transmission piece is driven to move through the connecting piece, and finally the wire cutting driving crank is driven to move.
In the automatic thread cutting mechanism of a sewing machine, as another scheme, a thread loosening seat is arranged between the driving source and the driving plate, the thread loosening seat is movably arranged on the bottom plate, a mandrel capable of moving along the axial direction is arranged on the driving source, a connecting piece capable of being attached to the right side of the thread loosening seat is arranged at the end part of the mandrel, a driving pin is arranged on the left side of the thread loosening seat, and a pushing seat capable of being attached to the left side of the driving pin is arranged on the driving plate. The mandrel moves to drive the connecting piece to move, so that the loose wire seat is driven to move, and the transmission pin on the loose wire seat is matched with the pushing seat on the transmission plate to drive the transmission plate to move, so that the wire cutting driving crank is driven to move.
In the automatic thread cutting mechanism of the sewing machine, the thread cutting driving crank comprises a left side arm and a right side arm which are arranged at intervals, through holes II are formed in the left side arm and the right side arm, and the thread cutting shaft penetrates through the through holes II and is in sliding fit; the left side arm and the right side arm are connected through a cross arm, and the sliding groove is axially formed in the cross arm.
In the automatic 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 moving knife assembly comprises a wire cutting crank, a wire cutting connecting rod and a moving knife, one end of the wire cutting crank is fixedly connected with the left end of the wire cutting shaft, and two ends of the wire cutting connecting rod are respectively hinged with the other end of the wire cutting crank and the moving knife. The thread cutting shaft can swing to drive the thread cutting crank to swing synchronously, and then the thread cutting connecting rod drives the movable knife to swing to be matched with the fixed knife to realize thread cutting.
In the automatic thread trimming mechanism of the sewing machine, the bottom plate of the sewing machine is fixedly provided with the fixing sleeve, the thread trimming 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 trimming 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; when the thread is cut, the thread cutting driving crank is not attached to the thread cutting section of the thread cutting cam any more, and the thread cutting crank can reset under the action of the reset torsion spring so as to cut the thread next time.
In the automatic thread cutting mechanism of the sewing machine, the right end of the fixed sleeve is fixed with the check ring, a reset pressure spring is arranged between the check ring and the thread cutting driving 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 driving 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 driving crank moves leftwards and is abutted against the wire cutting cam to cut the wire; after the thread is cut, the thread cutting driving crank can reset and move rightwards under the action of the reset pressure spring without contacting with the thread cutting cam.
The sewing machine is characterized by comprising the automatic thread cutting mechanism.
Compared with the prior art, the invention has the following advantages:
because the transmission plate is arranged on the shearing shaft, when the transmission plate is attached to the shearing driving crank, the stress area of the shearing driving crank is larger and uniform, and the transmission plate is approximately symmetrical about the axis of the shearing shaft, so that the shearing driving crank is not easy to be blocked when sliding.
Drawings
Fig. 1 is an isometric view of the present automatic wire cutting mechanism in a first embodiment.
Fig. 2 is a schematic structural diagram of the automatic thread cutting mechanism according to the first embodiment.
Fig. 3 is a schematic structural diagram of the automatic thread cutting mechanism according to the first embodiment.
Fig. 4 is a schematic diagram of the positional relationship among the components in the first embodiment.
Fig. 5 is a diagram showing the cooperation between the wire cutting cam and the wire cutting drive crank in the first embodiment.
Fig. 6 is a schematic structural diagram between the transmission plate and the shear shaft in the first embodiment.
Fig. 7 is a schematic structural diagram of the present base plate in the first embodiment.
Fig. 8 is a schematic structural diagram of the present driving plate in the first embodiment.
Fig. 9 is a schematic structural view of the forced return crank in the first embodiment.
Fig. 10 is a schematic structural view of the present wire cutting driving crank in the first embodiment.
Fig. 11 is a schematic structural view of the present base plate in the second embodiment.
Fig. 12 is a schematic structural diagram of the loose wire seat in the second embodiment.
Fig. 13 is a schematic structural diagram of the present driving plate in the second embodiment.
In the figure, 1, lower shaft; 2. cutting the spool; 3. a bottom plate; 4. a thread cutting cam; 5. cutting a line segment; 6. a forced cutter return section; 7. forced cutter-returning crank; 8. a boss; 9. a wire cutting driving crank; 10. a chute; 11. a wire cutting moving knife assembly; 12. a drive plate; 13. a driving source; 14. a bar-shaped groove; 15. a sliding part; 16. a pushing part; 17. a first through hole; 18. a mandrel; 19. a connecting piece; 20. a thread loosening seat; 21. a drive pin; 22. a pushing seat; 23. a left side arm; 24. a right side arm; 25. a second through hole; 26. a cross arm; 27. a fixed cutter; 28. a wire cutting crank; 29. cutting a wire connecting rod; 30. a movable knife; 31. a fixed sleeve; 32. a reset torsion spring; 33. a retainer ring; 34. resetting the compression spring. 35. A roller; 36. a forced cutter returning part; 37. a movable tool rest.
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, 2 and 3, the automatic thread cutting mechanism comprises a lower shaft 1 and a thread cutting shaft 2 which are parallel to each other, wherein the lower shaft 1 is rotatably arranged on a bottom plate 3 of a sewing machine, a thread cutting cam 4 is fixed on the lower shaft 1, and the outer circumferential surface of the thread cutting cam 4 is provided with a thread cutting segment 5 and a forced cutter returning segment 6. In this embodiment, the thread cutting cam 4 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 4, a screw can be designed at the forced cutter returning body. As another solution, the thread cutting cam 4 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, 2, 3 and 9, the cutting spool 2 is rotatably provided on the bottom plate 3 of the sewing machine, and a forced return crank 7 capable of being abutted against the forced return section 6 of the cutting cam 4 is fixed to the cutting spool 2. In this embodiment, the forced return crank 7 extends in the radial direction to form the forced return portion 36. The forced cutter-back crank 7 is also provided with a boss 8 protruding along the radial direction; the shearing shaft 2 is also sleeved with a shearing driving crank 9 which is in sliding fit with the shearing driving crank, the shearing driving crank 9 is provided with a chute 10 parallel to the shearing shaft 2, and a boss 8 of the forced return knife crank 7 is in sliding connection with the chute 10. Specifically, as shown in fig. 10, the wire cutting driving crank 9 includes a left side arm 23 and a right side arm 24 which are arranged at intervals, the left side arm 23 and the right side arm 24 are provided with a through hole two 25, and the wire cutting shaft 2 passes through the through hole two 25 and is in sliding fit; the left side arm 23 and the right side arm 24 are connected through a cross arm 26, the chute 10 is axially arranged on the cross arm 26, and the right side arm 24 is provided with a roller 35 which can be abutted against the thread cutting cam 4.
Preferably, as shown in fig. 5, that is, when the wire cutting cam 4 lifts the roller 35 to reach the limit point at the moment of wire cutting, a distance m exists between the forced return part 36 of the forced return crank 7 and the forced return part 6 of the wire cutting cam 4, and m is greater than 0, and if the wire cutting is not finished, that is, when the reset torsion spring 32 fails to reset the wire cutting crank 28, the forced return part 6 of the wire cutting cam 4 contacts with the forced return part 36 of the forced return crank 7 and finally resets the wire cutting movable cutter assembly 11 through motion transmission.
In order to realize thread cutting, as shown in fig. 1, 2 and 3, the left end of the thread cutting shaft 2 is also connected with a thread cutting moving knife assembly 11, in this embodiment, a fixed knife 27 is fixed on the bottom plate 3 of the sewing machine, and the fixed knife 27 is positioned at the left end of the lower shaft 1; the thread cutting movable cutter assembly 11 comprises a thread cutting crank 28, a thread cutting connecting rod 29, a movable cutter 30 and a movable cutter frame 37, one end of the thread cutting crank 28 is fixedly connected with the left end of the thread cutting shaft 2, two ends of the thread cutting connecting rod 29 are respectively hinged with the other end of the thread cutting crank 28 and the movable cutter frame 37, and the movable cutter 30 is fixed on the movable cutter frame 37. As other schemes, the fixed knife can be omitted, the wire cutting moving knife assembly 11 is designed into two sets of moving knives, wire cutting connecting rods and wire cutting cranks which can swing around the lower shaft 1, and the corresponding wire cutting cranks, the wire cutting connecting rods and the wire cutting moving knives are driven to move through the swing of the lower shaft 1, so that wire cutting is realized.
As shown in fig. 1, 2 and 3, a transmission plate 12 is sleeved at the right end of the thread cutting shaft 2 and is in sliding fit with the right end of the thread cutting shaft, a driving source 13 capable of driving the transmission plate 12 to slide towards the thread cutting driving crank 9 is fixed on the bottom plate 3 of the sewing machine, and the transmission plate 12 can drive the thread cutting driving crank 9 to slide along the axial direction, so that the end part of the thread cutting driving crank 9 is in contact with the thread cutting segment 5 of the thread cutting cam 4.
In this embodiment, the bottom plate 3 is provided with a bar-shaped groove 14 parallel to the scissor shaft 2, the driving plate 12 includes a sliding portion 15 and a pushing portion 16 which are perpendicular and fixedly connected, the sliding portion 15 is slidably connected with the bar-shaped groove 14, the pushing portion 16 is provided with a first through hole 17, the scissor shaft 2 passes through the first through hole 17 and is not contacted with the first through hole, and the sliding portion 15 can enable the pushing portion 16 to be abutted against the scissor wire driving crank 9 by sliding along the bar-shaped groove 14. The driving source 1 may be an electromagnet, a cylinder, a linear motor, or the like. Specifically, in the present embodiment, the driving source 1 is preferably an electromagnet, the driving source 13 is provided with a spindle 18 that is movable in the axial direction, and the end of the spindle 18 is provided with a connector 19 that can be abutted against the transmission plate 12. Of course, the spindle 18 may also be directly connected to or abut the drive plate 12.
In order to realize resetting for cutting the thread next time, as shown in fig. 1, 2 and 3, a fixed sleeve 31 is fixed on a bottom plate 3 of the sewing machine, the thread cutting shaft 2 passes through the fixed sleeve 31, a reset torsion spring 32 is sleeved on the fixed sleeve 31, and the acting end of the reset torsion spring 32 is connected with or abutted against the thread cutting crank 28. A check ring 33 is fixed at the right end of the fixed sleeve 31, a reset pressure spring 34 is arranged between the check ring 33 and the wire cutting driving crank 9, and the reset pressure spring 34 is sleeved on the wire cutting shaft 2; when the return compression spring 34 is in the return state, the wire cutting drive crank 9 is located on the right side of the wire cutting cam 4.
In order to ensure that all the components do not interfere and lock up when cutting the wire, as shown in fig. 4, L0 is the maximum left-moving stroke of the output end of the driving source 13, L1 is the distance between the driving source 13 and the cutting shaft 2, L2 is the length of the chute 10 on the cutting wire driving crank 9, L3 is the width of the forced return knife 36 on the forced return knife crank 7, L4 is the distance between the chute 10 and the right side surface of the forced return knife 36, wherein L1 is greater than 0, it is ensured that the cutting shaft 2 does not move leftwards under the action of the driving source 13, L4 is greater than 0, it is ensured that the chute 10 does not collide with the forced return knife 36, wherein L2 is greater than l0+l3+2χl4, and it is ensured that the forced return knife 36 can freely slide in the chute 10.
Embodiment two:
the difference between this embodiment and the first embodiment is that, as shown in fig. 11, 12 and 13, a loose wire seat 20 is provided between the driving source 13 and the driving plate 12, the loose wire seat 20 is movably disposed on the bottom plate 3, a mandrel 18 capable of moving along the axial direction is disposed on the driving source 13, a connecting piece 19 capable of being abutted against the right side of the loose wire seat 20 is disposed at the end of the mandrel 18, a driving pin 21 is disposed at the left side of the loose wire seat 20, and a pushing seat 22 capable of being abutted against the left side of the driving pin 21 is disposed on the driving plate 12.
The invention also provides a sewing machine comprising the automatic thread cutting mechanism.
The working principle of the invention is as follows: during normal sewing, the lower shaft 1 of the sewing machine rotates, and the thread cutting cam 4 on the lower shaft 1 always rotates, but does not contact with the thread cutting driving crank 9 on the thread cutting shaft 2, so that the thread cutting shaft 2 cannot swing, and further the thread cutting is not performed in response to the thread cutting moving knife assembly 11; when the wire is needed to be cut, the driving source 13 drives the transmission plate 12 to slide towards the wire cutting driving crank 9, so that the wire cutting driving crank 9 is driven to slide along the axial direction, the end part of the wire cutting driving crank 9 is contacted with the wire cutting segment 5 of the wire cutting cam 4, the rotating wire cutting cam 4 can drive the wire cutting driving crank 9 to swing, and then the forced cutter returning crank 7 is driven to swing through the cooperation of the sliding groove 10 and the boss 11, so that the wire cutting shaft 2 swings synchronously, and finally the movable cutter 30 at the end part of the wire cutting shaft 2 is driven to swing to cut the wire.
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 (5)
1. The automatic thread cutting mechanism of the sewing machine is characterized by comprising a lower shaft (1) and a thread cutting shaft (2) which are parallel to each other, wherein the lower shaft (1) is rotatably arranged on a bottom plate (3) of the sewing machine, a thread cutting cam (4) is fixed on the lower shaft (1), and a thread cutting segment (5) and a forced cutter returning segment (6) are arranged on the outer peripheral surface of the thread cutting cam (4); the shearing shaft (2) is rotatably arranged on a bottom plate (3) of the sewing machine, a forced cutter returning crank (7) which can be abutted against a forced cutter returning section (6) of the shearing cam (4) is fixed on the shearing shaft (2), and a boss (8) protruding along the radial direction is arranged on the forced cutter returning crank (7); a wire cutting driving crank (9) is sleeved on the wire cutting shaft (2) and is in sliding fit with the wire cutting driving crank, a sliding groove (10) parallel to the wire cutting shaft (2) is formed in the wire cutting driving crank (9), and a boss (8) of the forced cutter returning crank (7) is in sliding connection with the sliding groove (10); the left end of the thread cutting shaft (2) is also connected with a thread cutting moving knife assembly (11), the right end of the thread cutting shaft (2) is sleeved with a transmission plate (12) and is in sliding fit with the transmission plate, a driving source (13) capable of driving the transmission plate (12) to slide towards a thread cutting driving crank (9) is fixed on a bottom plate (3) of the sewing machine, and the transmission plate (12) can drive the thread cutting driving crank (9) to slide along the axial direction so that the end part of the thread cutting driving crank (9) is in contact with a thread cutting segment (5) of the thread cutting cam (4); the base plate (3) is provided with a strip-shaped groove (14) parallel to the shearing shaft (2), the transmission plate (12) comprises a sliding part (15) and a pushing part (16) which are vertical and fixedly connected, the sliding part (15) is in sliding connection with the strip-shaped groove (14), the pushing part (16) is provided with a first through hole (17), the shearing shaft (2) passes through the first through hole (17) and is not contacted with the first through hole, and the sliding part (15) can enable the pushing part (16) to be attached to the shearing driving crank (9) by sliding along the strip-shaped groove (14); a fixed sleeve (31) is fixed on a bottom plate (3) of the sewing machine, the thread cutting shaft (2) penetrates through the fixed sleeve (31), a reset torsion spring (32) is sleeved on the fixed sleeve (31), and the acting end of the reset torsion spring (32) is connected with or abutted against the thread cutting crank (28); a mandrel (18) capable of moving along the axial direction is arranged on the driving source (13), and a connecting piece (19) capable of being abutted against the transmission plate (12) is arranged at the end part of the mandrel (18); the novel wire loosening device is characterized in that a wire loosening seat (20) is arranged between the driving source (13) and the transmission plate (12), the wire loosening seat (20) is movably arranged on the bottom plate (3), a mandrel (18) capable of moving along the axial direction is arranged on the driving source (13), a connecting piece (19) capable of being attached to the right side of the wire loosening seat (20) is arranged at the end part of the mandrel (18), a transmission pin (21) is arranged on the left side of the wire loosening seat (20), and a pushing seat (22) capable of being attached to the left side of the transmission pin (21) is arranged on the transmission plate (12).
2. The automatic thread cutting mechanism of the sewing machine according to claim 1, wherein the thread cutting driving crank (9) comprises a left side arm (23) and a right side arm (24) which are arranged at intervals, a through hole II (25) is formed in each of the left side arm (23) and the right side arm (24), and the thread cutting shaft (2) penetrates through the through hole II (25) and is in sliding fit; the left side arm (23) and the right side arm (24) are connected through a cross arm (26), and the chute (10) is axially arranged on the cross arm (26).
3. The automatic thread cutting mechanism of a sewing machine according to claim 1, wherein a stationary knife (27) is fixed on a bottom plate (3) of the sewing machine, the stationary knife (27) being located at the left end of the lower shaft (1); the wire cutting movable cutter assembly (11) comprises a wire cutting crank (28), a wire cutting connecting rod (29), a movable cutter (30) and a movable cutter frame (37), one end of the wire cutting crank (28) is fixedly connected with the left end of the wire cutting shaft (2), two ends of the wire cutting connecting rod (29) are respectively hinged with the other end of the wire cutting crank (28) and the movable cutter frame (37), and the movable cutter (30) is fixed on the movable cutter frame (37).
4. The automatic thread cutting mechanism of the sewing machine according to claim 3, wherein a retainer ring (33) is fixed at the right end of the fixed sleeve (31), a reset pressure spring (34) is arranged between the retainer ring (33) and the thread cutting driving crank (9), and the reset pressure spring (34) is sleeved on the thread cutting shaft (2); when the reset pressure spring (34) is in a reset state, the wire cutting driving crank (9) is positioned on the right side of the wire cutting cam (4).
5. A sewing machine, comprising an automatic thread cutting mechanism as recited in any one of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811467364.5A CN109295622B (en) | 2018-12-03 | 2018-12-03 | Automatic thread trimming mechanism of sewing machine and sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811467364.5A CN109295622B (en) | 2018-12-03 | 2018-12-03 | Automatic thread trimming mechanism of sewing machine and sewing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109295622A CN109295622A (en) | 2019-02-01 |
| CN109295622B true CN109295622B (en) | 2023-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811467364.5A Active CN109295622B (en) | 2018-12-03 | 2018-12-03 | Automatic thread trimming mechanism of sewing machine and sewing machine |
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Families Citing this family (2)
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| CN109722798B (en) * | 2019-03-23 | 2023-08-25 | 美机科技集团有限公司 | Thread cutting and presser foot lifting mechanism of sewing machine |
| 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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| US3216381A (en) * | 1962-04-04 | 1965-11-09 | Necchi Spa | Buttonhole sewing machine |
| US3371633A (en) * | 1965-04-07 | 1968-03-05 | Pfaff Ag G M | Thread cutting device for sewing machines |
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| CN201351222Y (en) * | 2008-12-24 | 2009-11-25 | 安乡安凯缝制机械有限公司 | Half-automatic trimming mechanism of high post bed composite-feed sewing machine |
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| CN109295622A (en) | 2019-02-01 |
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