Upper thread tension and thread cutting control device

Abstract

The utility model belongs to the technical field of sewing machines, and discloses an upper thread tension and thread cutting control device which comprises a thread cutting control stepping motor, and an output shaft of the thread cutting control stepping motor is connected with a track cam. The tangent crank transmission mechanism is matched and connected with a track groove in the end face of the track cam and slides along the track groove; the thread cutting mechanism is connected with one end, far away from the track cam, of the thread cutting crank transmission mechanism; the thread clamping crank transmission mechanism is matched and connected with a track groove in the outer peripheral surface of the track cam and slides along the track groove; the thread clamping mechanism is connected with the thread clamping crank transmission mechanism; the thread cutting control stepping motor is started, the thread cutting crank transmission mechanism and the thread clamping crank transmission mechanism drive the corresponding thread cutting mechanism and the corresponding thread clamping mechanism to work, and corresponding thread cutting and thread clamping work is carried out. According to the utility model, one motor is arranged to simultaneously control wire clamping and wire cutting actions, so that the control is more accurate, one motor is reduced, and the control cost is effectively reduced.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology, and in particular relates to a head thread tension and tangent control device. Background Technology

[0002] Most existing sewing machines use electromagnets or two motors as power sources to control the thread clamping and cutting actions separately. The disadvantages are as follows: 1) When using electromagnets, the action speed and stroke are not variable and the noise is high; 2) When using two motors to control the thread clamping and cutting actions separately, the control cost is high. Utility Model Content

[0003] The purpose of this invention is to solve the above problems and provide a surface tension and tangent control device.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a surface tension and tangent control device, comprising,

[0005] A wire-cutting controlled stepper motor, the output shaft of which is connected to a track cam;

[0006] The tangential crank transmission mechanism is connected to the track groove on the end face of the track cam and slides along the track groove;

[0007] The tangential mechanism is connected to the end of the tangential crank drive mechanism away from the track cam.

[0008] The clamping crank transmission mechanism is connected to the track groove on the outer peripheral surface of the track cam and slides along the track groove;

[0009] The wire clamping mechanism is connected to the wire clamping crank transmission mechanism;

[0010] The wire-cutting control stepper motor starts, and drives the corresponding wire-cutting mechanism and wire-clamping mechanism through the wire-cutting crank transmission mechanism and the wire-clamping crank transmission mechanism to perform the corresponding wire-cutting and wire-clamping operations.

[0011] According to this utility model, the tangential crank transmission mechanism further includes an upper cutting crank shaft, one end of which is provided with a ball bearing that engages with the track groove of the track cam and slides along the track groove. A lower cutting crank is provided at the end of the upper cutting crank shaft near the track cam, and the lower cutting crank is hinged to the shaft at the end of the upper cutting crank shaft near the track cam. The shaft at the end of the upper cutting crank shaft away from the track cam is hinged to the lower cutting crank shaft and the upper cutting crank. The other ends of the lower cutting crank shaft and the upper cutting crank are both connected to an upper cutting connecting rod, which is connected to the cutting mechanism.

[0012] According to this utility model, the cutting mechanism further includes an upper cutting blade holder hinged to one of the cutting blade connecting rods, an upper cutting blade hinged to the upper cutting blade holder, a lower cutting blade holder hinged to the other upper cutting blade connecting rod, and the lower cutting blade holder hinged to the lower cutting blade. The upper and lower cutting blade holders are also rotatably connected to the oil pump bushing. The upper and lower cutting blades are connected to the needle plate. The upper and lower cutting blades move toward the center of the needle respectively, and their cutting edges overlap near the center of the needle to cut the line.

[0013] According to this utility model, the wire clamping crank transmission mechanism further includes a first wire clamping crank, one end of which is provided with a ball bearing that slides along the outer circumferential groove of the track cam. The other end of the first wire clamping crank is connected to a wire clamping drive shaft parallel to the shaft of the wire cutting control stepper motor. A second wire clamping crank is hinged to the far end of the wire clamping drive shaft, and a first wire clamping bushing is provided at the connection between the two. The second wire clamping crank is hinged to a wire clamping transmission connecting rod, which is vertically upward and its other end is hinged to another second wire clamping crank. One end of the wire clamping transmission shaft, which is parallel to the wire clamping drive shaft, is connected to the second wire clamping crank, and the other end is connected to a third wire clamping crank. The third wire clamping crank is hinged to a wire clamping connecting rod, which is hinged to a wire clamping adapter, and the wire clamping adapter is connected to the wire clamping mechanism.

[0014] According to this utility model, the wire clamping mechanism further includes a wire clamping screw connected at one end to the wire clamping adapter. The wire clamping screw passes through the wire clamping base, the wire clamping plate, the wire take-up spring and the outer cover in sequence to form the wire clamping mechanism. Under the action of external force, the wire clamping drive shaft swings, pushing the wire clamping adapter to move along the wire clamping screw towards the wire clamping base until the two surfaces are in contact, and the wire is clamped by the wire clamping plate.

[0015] Compared with the prior art, the beneficial effects of this utility model are: by setting up a motor to control the clamping and cutting actions simultaneously, this utility model achieves more precise control and reduces one motor, effectively reducing control costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a sewing machine's thread tension and tangent control device according to the present invention;

[0017] Figure 2a This is a schematic diagram of the wire clamping mechanism in the relaxed state of this utility model;

[0018] Figure 2b This is a schematic diagram of the clamping state of the wire clamping mechanism of this utility model;

[0019] Figure 3a This is a schematic diagram of the shaft of the stepper motor with wire-cutting control in the non-working state of this utility model;

[0020] Figure 3bThis is a schematic diagram showing the positions of the upper cutter crankshaft and the lower cutter crank in the non-working state of this utility model;

[0021] Figure 4a This is a schematic diagram of the rotating shaft of the stepper motor for wire cutting control in the tangential state according to this utility model;

[0022] Figure 4b This is a schematic diagram showing the positions of the upper cutter crankshaft and the lower cutter crank in the tangential state of this utility model;

[0023] Figure 5a This is a schematic diagram showing the hinge connection between one of the upper cutting blade connecting rods and the lower cutting blade holder of this utility model;

[0024] Figure 5b This is a schematic diagram showing the position of another upper cutting blade connecting rod of this utility model;

[0025] Figure 6 This is a schematic diagram showing the connection between the tangent bushing and the upper cutter crank shaft of this utility model;

[0026] Figure 7 This is a schematic diagram showing the connection between the track cam and the lower cutter crank of this utility model.

[0027] Figure 8 This is a schematic diagram showing the connection between the upper cutter, the lower cutter, and the needle plate of this utility model. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only one embodiment of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figure 1As shown, this application embodiment provides a sewing machine thread tension and tangential control device, including a tangential control stepper motor 11. The output shaft of the tangential control stepper motor 11 is connected to a track cam 10. A tangential crank transmission mechanism is tangentially connected in the track groove on the end face of the track cam 10. One end of the tangential crank transmission mechanism is connected to a tangential tangential mechanism. As the track cam 10 rotates, the tangential crank transmission mechanism drives the tangential tangential mechanism to perform tangential ... This invention, by setting a track cam 10 connected to the output shaft of the wire-cutting control stepper motor 11, connects both the wire-cutting crank transmission mechanism that drives the wire-cutting mechanism and the wire-clamping crank transmission mechanism that drives the wire-clamping mechanism to the track cam 10. This enables wire-cutting and wire-clamping operations to be performed by a single wire-cutting control stepper motor 11, which reduces costs compared to the prior art where two motors control wire cutting and wire clamping separately.

[0030] Specifically, the tangential crank transmission mechanism includes an upper cutter crank shaft 17, one end of which is provided with a ball bearing 15. The ball bearing 15 engages with the track groove of the track cam 10 and slides along the track groove. A lower cutter crank 9 is provided at the end of the upper cutter crank shaft 17 near the track cam 10. The lower cutter crank 9 is hinged to the shaft at the end of the upper cutter crank shaft 17 near the track cam 10. The shaft at the end of the upper cutter crank shaft 17 away from the track cam 10 is hinged to the lower cutter crank shaft 7 and the upper cutter crank 8. A tangential bushing 16 is provided on the outer periphery of the shaft of the upper cutter crank shaft 17. The other ends of the lower cutter crank shaft 7 and the upper cutter crank 8 are both connected to an upper cutter connecting rod 6, which is connected to the cutter mechanism.

[0031] Specifically, the cutting mechanism includes an upper cutting blade holder 3 hinged to one of the cutting blade connecting rods 6, the upper cutting blade holder 3 hinged to the upper cutting blade 2, the other upper cutting blade connecting rod 6 hinged to the lower cutting blade holder 5, the lower cutting blade holder 5 hinged to the lower cutting blade 4, the upper cutting blade holder 3 and the lower cutting blade holder 5 are also rotatably connected to the oil pump bushing 12, the upper cutting blade 2 and the lower cutting blade 4 are connected to the needle plate 1, the upper cutting blade 2 and the lower cutting blade 4 move toward the center of the needle respectively, and the cutting edges of the two overlap near the center of the needle to cut the line.

[0032] The wire clamping crank transmission mechanism includes a first wire clamping crank 19, one end of which is provided with a ball bearing 15 that slides along the outer circumferential groove of the track cam 10. The other end of the first wire clamping crank 19 is connected to a wire clamping drive shaft 21 parallel to the shaft of the wire cutting control stepper motor 11. A second wire clamping crank 23 is hinged to one end of the wire clamping drive shaft 21, and a first wire clamping bushing 22 is provided at the connection point. The second wire clamping crank 23 is hinged to the wire clamping transmission connecting rod 25 by a shaft screw. The rod 25 is set vertically upward, and its other end is hinged to another second wire clamping crank 23 by a shaft screw. The wire clamping drive shaft 28, which is set parallel to the wire clamping drive shaft 21, is connected at one end to the second wire clamping crank 23 and at the other end to a third wire clamping crank 30. A second wire clamping bushing 29 is provided at the connection between the two. The third wire clamping crank 30 is hinged to the wire clamping connecting rod 32 by a shaft screw. The wire clamping connecting rod 32 is hinged to the wire clamping adapter 33 by a connector connecting pin. The wire clamping adapter 33 is connected to the wire clamping mechanism.

[0033] like Figure 2a and Figure 2b As shown, the wire clamping mechanism includes a wire clamping screw 34 connected at one end to the wire clamping adapter 33. The wire clamping screw 34 passes through the wire clamping base 35, the wire clamping plate 36, the wire take-up spring 37, and the outer cover 38 in sequence to form the wire clamping mechanism. Under the action of external force, the wire clamping drive shaft 28 swings, pushing the wire clamping adapter 33 to move along the wire clamping screw 34 towards the wire clamping base 35 until the two surfaces are in contact, and the wire is clamped by the wire clamping plate 36.

[0034] The working principle of this utility model is as follows: In the non-working state, such as Figure 3a and Figure 3b As shown, the wire-cutting controlled stepper motor 11 is in the initial position. Assume the shaft of the wire-cutting controlled stepper motor 11 is located as follows: Figure 3a As shown, the upper cutter crankshaft 17 is positioned at angle δ. Figure 3b As shown, the lower crank 9 is positioned at angle α. Figure 3b The figure is located at angle β.

[0035] Tangent action: such as Figure 4a and Figure 4b As shown, the shaft of the wire-cutting control stepper motor 11 is set to be positioned as follows: Figure 4a As shown, at the γ angle position, the ball bearing 15 on the upper cutter crankshaft 17 moves along the track groove of the track cam 10, as... Figure 4bAs shown, the upper cutting blade crank shaft 17 rotates by an angle θ, which in turn drives the upper cutting blade crank 8 to rotate by an angle θ. This, in turn, drives the upper cutting blade holder 3 to rotate via the upper cutting blade connecting rod 6 hinged to the upper cutting blade crank 8. This causes the cutting edge of the upper cutting blade 2, which is fixed on the upper cutting blade holder 3, to rotate with the lower cutting blade crank 9, which in turn drives the lower cutting blade crank shaft 7 to rotate by an angle α. This, in turn, drives the lower cutting blade holder 5 to rotate via the upper cutting blade connecting rod 6 hinged to the lower cutting blade crank shaft 7. This causes the cutting edge of the lower cutting blade 4, which is fixed on the lower cutting blade holder 5, to perform a cutting action by facing each other, thus achieving the cutting action. After the cutting is completed, the motor returns to the initial position, and the entire cutting mechanism returns to the initial position accordingly.

[0036] Wire clamping action: The stepper motor 11 controlling the wire cutting drives the track cam 10. The track cam 10 is in tangential contact with the outer cylindrical surface of the ball bearing on the first wire clamping crank 19. The first wire clamping crank 19 drives one of the second wire clamping cranks 23 to rotate through the wire clamping drive shaft 21. The second wire clamping crank 23 is hinged to one end of the wire clamping transmission link 25 and swings back and forth. The other second wire clamping crank 23 is hinged to the other end of the wire clamping transmission link 25. The second wire clamping crank 23 drives the third wire clamping crank 30 to rotate through the wire clamping transmission shaft 28. The third wire clamping crank 30 rotates at a certain angle and drives the wire clamping adapter 33 through the wire clamping link 32 to achieve back and forth movement, thus completing the wire clamping action.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A surface tension and tangent control device, characterized in that, include, A wire-cutting controlled stepper motor, the output shaft of which is connected to a track cam; The tangential crank transmission mechanism is connected to the track groove on the end face of the track cam and slides along the track groove; The tangential mechanism is connected to the end of the tangential crank drive mechanism away from the track cam. The clamping crank transmission mechanism is connected to the track groove on the outer peripheral surface of the track cam and slides along the track groove; The wire clamping mechanism is connected to the wire clamping crank transmission mechanism; The wire-cutting control stepper motor starts, and drives the corresponding wire-cutting mechanism and wire-clamping mechanism through the wire-cutting crank transmission mechanism and the wire-clamping crank transmission mechanism to perform the corresponding wire-cutting and wire-clamping operations.

2. The surface tension and tangent control device as described in claim 1, characterized in that, The tangential crank transmission mechanism includes an upper cutter crank shaft, one end of which is provided with a ball bearing that engages with a track cam groove and slides along the groove. A lower cutter crank is provided at the end of the upper cutter crank shaft near the track cam, and the lower cutter crank is hinged to the shaft at the end of the upper cutter crank shaft near the track cam. The shaft at the end of the upper cutter crank shaft away from the track cam is hinged to both the lower cutter crank shaft and the upper cutter crank. The other ends of both the lower cutter crank shaft and the upper cutter crank are connected to an upper cutter connecting rod, which is connected to the cutter mechanism.

3. The surface tension and tangent control device as described in claim 2, characterized in that, The cutting mechanism includes an upper cutting blade holder hinged to one of the cutting blade connecting rods, an upper cutting blade hinged to the upper cutting blade holder, a lower cutting blade holder hinged to the other upper cutting blade connecting rod, and the lower cutting blade holder hinged to the lower cutting blade. The upper and lower cutting blade holders are also rotatably connected to the oil pump bushing. The upper and lower cutting blades are connected to the needle plate. The upper and lower cutting blades move toward the center of the needle respectively, and their cutting edges overlap near the center of the needle to cut the line.

4. A surface tension and tangent control device as described in any one of claims 1-3, characterized in that, The wire clamping crank transmission mechanism includes a first wire clamping crank, one end of which is provided with a ball bearing that slides along the outer circumferential groove of the track cam. The other end of the first wire clamping crank is connected to a wire clamping drive shaft parallel to the shaft of the wire cutting control stepper motor. A second wire clamping crank is hinged to the far end of the wire clamping drive shaft, and a first wire clamping bushing is provided at the connection between the two. The second wire clamping crank is hinged to a wire clamping transmission connecting rod, which is vertically upward and its other end is hinged to another second wire clamping crank. One end of the wire clamping transmission shaft, which is parallel to the wire clamping drive shaft, is connected to the second wire clamping crank, and the other end is connected to a third wire clamping crank. The third wire clamping crank is hinged to a wire clamping connecting rod, which is hinged to a wire clamping adapter, and the wire clamping adapter is connected to the wire clamping mechanism.

5. The surface tension and tangent control device as described in claim 4, characterized in that, The wire clamping mechanism includes a wire clamping screw connected to a wire clamping adapter at one end. The wire clamping screw passes through the wire clamping base, the wire clamping plate, the wire take-up spring, and the outer cover in sequence to form the wire clamping mechanism. Under the action of external force, the wire clamping drive shaft swings, pushing the wire clamping adapter to move along the wire clamping screw towards the wire clamping base until the two surfaces are in contact, and the wire is clamped by the wire clamping plate.

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