CN218263028U - Sewing machine and trimming, presser foot lifting and needle distance adjusting mechanism thereof - Google Patents

Abstract

The utility model belongs to the technical field of sewing machine accessories, in particular to a sewing machine and a thread trimming, presser foot lifting and needle distance adjusting mechanism thereof, which comprises a frame, wherein a thread trimming component, a presser foot lifting component and a needle distance adjusting component are arranged on the frame; a motor is further arranged at the lower part of the rack, a second output shaft of the motor extends forwards and drives the thread trimming component, a first output shaft of the motor extends backwards and drives the presser foot lifting component and the needle pitch adjusting component, a first crank is mounted on the first output shaft, and the first crank drives the needle pitch adjusting component; a first supporting shaft is arranged on one side of the swinging seat of the needle pitch adjusting assembly and drives the swinging seat to swing within a set angle; one end of the first supporting shaft, which faces the motor, is provided with a first stirring piece, the first stirring piece is provided with a first sliding groove, a sliding block is arranged in the first sliding groove, and the outer end of the first crank is provided with the sliding block.

Description

Sewing machine and trimming, presser foot lifting and needle distance adjusting mechanism thereof

Technical Field

The utility model relates to a sewing machine accessory technical field refers in particular to a sewing machine and trimming, lift presser foot and gauge needle adjustment mechanism thereof.

Background

Existing sewing machines are machines that sew up the material by means of a thread. The sewing machine comprises a needle bar mechanism, a thread take-up mechanism, a feeding mechanism, a thread hooking mechanism, a pressing mechanism, a presser foot lifting mechanism, a needle pitch adjusting mechanism, a thread cutting mechanism and the like, wherein along with the development of automation, the mechanisms are gradually improved and provided with driving pieces, and the driving pieces comprise motors, electromagnets, air cylinders, oil cylinders and the like. The sewing machine realizes backstitch when the needle pitch is adjusted to a negative value by the needle pitch adjusting mechanism.

In the existing design, the motor drives the needle pitch adjusting mechanism to rotate through a cam to realize the adjustment of the needle pitch adjusting mechanism, for example, a thread cutting, presser foot lifting and needle pitch adjusting driving device of chinese patent application No. 202011225730.3, the needle pitch adjusting cam is a curved quadrilateral, the needle pitch adjusting mechanism is abutted against the peripheral wall of the needle pitch adjusting cam, and the needle pitch adjusting roller on the swing ejector rod is abutted against and contacted with different surfaces of the curved quadrilateral, so as to realize the adjustment of the needle pitch of the sewing machine under different movements.

A motor drives the thread cutting assembly, the presser foot lifting assembly and the needle pitch adjusting assembly at the same time, and essentially cuts the rotation angle of a motor shaft, and reasonably cuts three angles corresponding to the thread cutting assembly, the presser foot lifting assembly and the needle pitch adjusting assembly within a rotation range of 360 degrees. The motor shaft is in a needle pitch adjusting area under a general condition, enters a corresponding thread cutting area or a corresponding presser foot lifting area when thread cutting or presser foot lifting is needed, and returns to the needle pitch adjusting area after execution is finished;

the defects of the prior art are that when the curved quadrilateral rotates, the curved quadrilateral collides with the needle pitch adjusting roller easily to collide with the needle pitch adjusting roller, the curved quadrilateral and the needle pitch adjusting roller are easily damaged, the motion between the curved quadrilateral and the needle pitch adjusting roller is unstable, the whole structure is complex, and the curved quadrilateral and the needle pitch adjusting roller are not compact enough.

Disclosure of Invention

The utility model aims at providing a sewing machine and trimming, lift presser foot and gauge needle adjustment mechanism thereof.

The purpose of the utility model is realized like this:

a thread cutting, presser foot lifting and needle distance adjusting mechanism of a sewing machine comprises a rack, wherein a thread cutting assembly, a presser foot lifting assembly and a needle distance adjusting assembly are arranged on the rack; the lower part of the frame is also provided with a motor,

a second output shaft of the motor extends forwards and drives the thread trimming component,

a first output shaft of the motor extends backwards and drives the presser foot lifting component and the needle pitch adjusting component,

a first crank is mounted on the first output shaft and drives the needle pitch adjusting assembly;

a first supporting shaft is arranged on one side of the swinging seat of the needle pitch adjusting assembly and drives the swinging seat to swing within a set angle; one end of the first supporting shaft, which faces the motor, is provided with a first stirring piece, the first stirring piece is provided with a first sliding groove, a sliding block is arranged in the first sliding groove, and the outer end of the first crank is provided with the sliding block.

Preferably, a first cam is mounted on the first output shaft, and the first cam drives the presser foot lifting assembly;

a duplex swing rod is rotatably mounted on the rack and provided with a first swing arm and a second swing arm; the swing arm end of the first swing arm is hinged with a pressure foot lifting connecting rod, and the swing arm end of the second swing arm is abutted against the first cam.

Preferably, the double-linkage oscillating bar is arranged below the first shifting piece, and the first shifting piece is positioned between the first swing arm and the second swing arm of the double-linkage oscillating bar.

Preferably, a roller is hinged to a swing arm end of the second swing arm of the duplex swing rod, and the roller abuts against a wheel surface of the first cam.

Preferably, a second supporting shaft is arranged on the other side of the swinging seat; the first support shaft and the second support shaft are arranged on the same axis and respectively extend into two side parts of the swing seat;

the first support shaft is also provided with a second stirring piece, and the second stirring piece is provided with a second sliding groove;

and a toggle pin is arranged on the side part of the swing seat close to the first supporting shaft and is arranged in the second sliding groove.

Preferably, a second crank is mounted on the second output shaft, a second cam is arranged on the second crank, and the second cam drives the thread trimming assembly;

the second cam is provided with a through hole, one end of the second crank is arranged in the through hole, and the working curved surface of the second cam is the inner wall of the through hole.

Preferably, the first cam comprises a rotating end and a protruding end, the rotating end of the first cam is connected with the first output shaft, and the protruding end is used for shifting the second swing arm;

the first cam is provided with a working curved surface and a non-working curved surface, the working curved surface is the circumferential surface of the protruding end, and the non-working curved surface is the circumferential surface of the rotating end.

Preferably, the motor is transversely arranged at the lower side of the middle part of the frame.

Preferably, a rotating shaft penetrates through the duplex oscillating bar, and the duplex oscillating bar rotates around the rotating shaft;

and a return spring for resetting the presser foot is arranged on the rotating shaft, one end of the return spring is arranged on the rack, and the other end of the return spring is arranged on the duplex oscillating bar.

A sewing machine comprises the thread cutting, the presser foot lifting and the stitch length adjusting mechanism of the sewing machine.

Compared with the prior art, the utility model outstanding and profitable technological effect is:

1. the utility model discloses a spout and the design of slider make the motor drive first stirring piece through first crank and rotate, and then when driving the needle pitch module, the inner wall of first spout can restrict the removal of slider all the time, make the slider can only along the reciprocating linear motion of the extending direction of first spout, and then can be more stable when making first crank drive first stirring piece rotate, also can be more stable when first stirring piece drives the needle pitch module and moves, finally reduce the error rate of needle pitch module, improve the yields of product; in the process that the first crank rotates 360 degrees, the sliding block always slides in the first sliding groove, so that when the working angle of the motor shaft is divided, the trimming area and the presser foot lifting area can be sequentially arranged; when the presser foot is only required to be lifted and the thread is not cut, the motor shaft enters from the presser foot lifting area and does not enter the thread cutting area; when the thread trimming and the presser foot lifting are needed, the motor shaft rotates in the opposite direction, enters the thread trimming area and enters the presser foot lifting area, can rotate 360 degrees and then returns to the set needle pitch position, does not need repeated forward and reverse rotation, is beneficial to the response of the motor, and prolongs the service life.

2. The first support shaft and the first output shaft of the utility model are arranged up and down in the vertical plane and arranged back and forth in the horizontal plane; the first toggle piece is arranged downwards, so that a working area of the first toggle piece forms a sector area which deflects for a certain angle; the working area of the first crank is a circular area in the fan-shaped area, so that the whole structure is compact; in addition, the area of the lower part of the frame can be better utilized.

3. The setting of pair pendulum rod is in the below of first stirring piece, and just first stirring piece is located between the first swing arm and the second swing arm of pair pendulum rod. The sector area formed by the first shifting piece deflecting for a certain angle and the duplex swing rod are not interfered with each other, a plurality of parts are compact, and the installation space is contracted to a smaller range, so that the whole installation space is saved; meanwhile, the structure can be suitable for the existing structures such as the pressure foot lifting connecting rod and the like, and large-scale adjustment is not needed.

4. The utility model discloses after the pair pendulum rod was held by the protrusion of first cam and is driven the certain angle of pair pendulum rod slope, the presser foot can be by the lifting or descend, and reset spring also can be strained. When the non-working surface of the duplex oscillating bar, namely the rotating end is contacted with the roller, the reset spring drives the duplex oscillating bar to reset, and simultaneously drives the duplex oscillating bar to reset, finally, the reset of the presser foot is realized, and the reset structure is simple and effective.

Drawings

Fig. 1 is a schematic view of the overall structure of the sewing machine.

Fig. 2 is a schematic structural diagram of a thread trimming, presser foot lifting and needle pitch adjusting mechanism.

Fig. 3 is a partial schematic structural view of the presser foot lifting and gauge adjustment assembly.

Fig. 4 is a schematic view of a connection structure of the second cam and the second crank.

Fig. 5 is a schematic view of the division of the rotation angle of the motor.

Reference numerals are as follows: 1. a frame; 2. a thread trimming assembly; 3. lifting the presser foot assembly; 4. a needle pitch adjustment assembly; 5. a motor; 6. a second output shaft; 7. a first output shaft; 8. a first crank; 9. a swing seat; 10. a first support shaft; 11. a first toggle piece; 12. a first chute; 13. a slider; 14. a first cam; 15. a duplex swing link; 16. a first swing arm; 17. a second swing arm; 18. a roller; 19. a second support shaft; 20. a second toggle piece; 21. a second chute; 22. a toggle pin; 23. a second crank; 24. a second cam; 25. a through hole; 26. a rotating end; 27. a protruding end; 28. a rotating shaft; 29. a return spring; 30. a rolling wheel; 31. A thread cutting shaft; 32. a thread cutting crank;

a 1-a stitch length adjustment area; a 2-a trimming area; a 3-lifting the presser foot area.

Detailed Description

The following describes the present invention in further detail with reference to the accompanying drawings.

As shown in FIG. 1, a sewing machine includes a thread trimming, a presser foot lifting and a stitch length adjusting mechanism. As shown in fig. 2, the thread trimming, presser foot lifting and gauge needle adjusting mechanism comprises a frame 1, wherein a thread trimming assembly 2, a presser foot lifting assembly 3 and a gauge needle adjusting assembly 4 are arranged on the frame 1; the lower part of the frame 1 is also provided with a motor 5. Wherein, the second output shaft 6 of the motor 5 extends forwards and drives the thread trimming assembly 2, and the first output shaft 7 of the motor 5 extends backwards and drives the presser foot lifting assembly 3 and the needle pitch adjusting assembly 4. Therefore, the synchronous driving of the thread trimming component 2, the presser foot lifting component 3 and the needle pitch adjusting component 4 is realized through the motor 5 and two output shafts.

Specifically, referring to fig. 2 and 3, a first crank 8 is mounted on the first output shaft 7, and the first crank 8 drives the needle pitch adjusting assembly 4 to move. A first supporting shaft 10 is arranged on one side of a swinging seat 9 of the needle pitch adjusting component 4, and the first supporting shaft 10 drives the swinging seat 9 to swing within a set angle; one end of the first supporting shaft 10, which faces the motor, is provided with a first toggle piece 11, the first toggle piece 11 is provided with a first sliding groove 12, a sliding block 13 is arranged in the first sliding groove 12, and the outer end of the first crank 8 is provided with the sliding block 13.

Thereby make the motor drive through first crank 8 through the design of spout and slider 13 and first stir 11 rotations, and then when driving the needle pitch module, the inner wall of first spout 12 can restrict the removal of slider 13 all the time, make slider 13 can only be along the reciprocal linear motion of the extending direction of first spout 12, and then can be more stable when making first crank 8 drive first stir 11 rotations, also can be more stable when first stir 11 drive needle pitch module motion, finally reduce the error rate of needle pitch module, improve the yields of product.

Referring to fig. 2 and 3, a first cam 14 is mounted on the first output shaft 7, and the first cam 14 drives the presser foot lifting assembly 3. Specifically, a duplex swing rod 15 is rotatably mounted on the frame 1, the duplex swing rod 15 has a first swing arm 16 and a second swing arm 17, a pressure raising and pressing foot connecting rod is hinged to a swing arm end of the first swing arm 16, and a swing arm end of the second swing arm 17 abuts against the first cam 14. Therefore, the first cam 14 is driven to rotate by the motor 5, then the first cam 14 drives the second swing arm 17 to move, the second swing arm 17 drives the first swing arm 16 to move through the main body in the middle of the duplex swing rod 15, and finally the first swing arm 16 drives the presser foot lifting assembly 3 to move.

With reference to fig. 1, 2 and 3, the dual oscillating bar 15 is disposed below the first toggle member 11, and the first toggle member 11 is located between the first swing arm 16 and the second swing arm 17 of the dual oscillating bar 15. Therefore, under the condition that the components are not interfered with each other, the components are compact as much as possible, the installation space is shrunk to a smaller range as much as possible, and the whole installation space is further saved.

With reference to fig. 1 and fig. 3, a rotating shaft 28 is arranged on the duplex swing link 15 in a penetrating manner, and the duplex swing link 15 rotates around the rotating shaft 28. The rotating shaft 28 is provided with a return spring 29 for returning the presser foot, one end of the return spring 29 is arranged on the frame 1, and the other end of the return spring 29 is arranged on the duplex oscillating bar 15, so that when the duplex oscillating bar 15 is driven by the protruding end 27 of the first cam 14 to incline the duplex oscillating bar 15 by a certain angle, the presser foot can be lifted or lowered, and the return spring 29 can be tensioned. When the non-working surface of the duplex swing link 15, that is, the rotating end 26 contacts with the roller 18, the return spring 29 drives the duplex swing link 15 to return, and simultaneously drives the duplex swing link 15 to return, finally, the return of the presser foot is realized, and the return structure is simple and effective.

As shown in fig. 3, a roller 18 is hinged to a swing arm end of the second swing arm 17 of the tandem swing link 15, and the roller 18 abuts against a wheel surface of the first cam 14. Therefore, a part of the friction force between the second swing arm 17 and the first cam 14 is normally changed into the acting force of the rotation of the roller 18 through the roller 18, so that the movement between the second swing arm 17 and the second cam 24 is smoother, the friction force when the second swing arm 17 and the second cam are contacted together is reduced, and the damage of the second swing arm and the second cam caused by scraping is reduced.

With reference to fig. 2 and 3, the first cam 14 includes a rotating end 26 and a protruding end 27, the rotating end 26 is connected to the first output shaft 7, so as to drive the first cam 14 by the motor 5, and the protruding end 27 protrudes outward to shift the second swing arm 17, so as to realize the movement of the presser foot lifting assembly 3. The first cam 14 has a working curved surface, i.e., a peripheral surface of the protruding end 27, and a non-working curved surface, i.e., a peripheral surface of the rotating end 26. The diameters of the rotating end 26 and the protruding end 27 are different, so that when the first cam 14 rotates and the non-working curved surface of the first cam 14 contacts with the roller 18, the double pendulum rod 15 is kept fixed and does not swing. When the working curved surface is contacted with the roller 18, the protruding end 27 jacks the roller 18 to drive the duplex swing rod 15 to swing, and the pressure foot lifting assembly 3 is driven to move.

As shown in fig. 3, a second support shaft 19 is disposed on the other side of the swing seat 9, and the first support shaft 10 and the second support shaft 19 are disposed on the same axis and extend into two side portions of the swing seat 9, respectively, so that two ends of the swing seat 9 are stabilized by the first support shaft 10 and the second support shaft 19. The first support shaft 10 is also provided with a second toggle piece 20, and the second toggle piece 20 is provided with a second sliding groove 21; the side part of the swing seat 9 close to the first support shaft 10 is provided with a toggle pin 22, and the toggle pin 22 is arranged in the second sliding chute 21. Further, the second toggle member 20 can be more stable when the needle pitch adjusting assembly 4 is toggled by the stable sliding of the toggle pin 22 in the second sliding slot 21. The first support shaft 10 supports the swing seat 9 and also drives the swing seat 9 via the tumbler pin 22.

With reference to fig. 2 and 4, a second crank 23 is mounted on the second output shaft 6, a second cam 24 is disposed on the second crank 23, the second cam 24 drives the thread cutting assembly 2, the thread cutting assembly 2 includes a thread cutting shaft 31 and a thread cutting crank 32, and thus the second cam 24 drives the thread cutting shaft 31 and the thread cutting crank 32 to move. A through hole 25 is formed in the second cam 24, one end of the second crank 23 is arranged in the through hole 25, and the working curved surface of the second cam 24 is the inner wall of the through hole 25. In this embodiment, the part of the second crank 23 disposed in the through hole 25 is a rolling wheel 30, and after the second crank 23 rotates, the rolling wheel 30 rolls on the working curved surface of the second cam 24 to drive the second cam 24 to rotate, and the second cam 24 drives the thread trimming assembly 2. Therefore, the movement of the rolling wheel 30 is limited by the inner wall of the through hole 25, so that the rolling wheel 30 drives the second cam 24 at the inner side of the second cam 24, the rolling wheel 30 is prevented from being separated from the second cam 24, and the movement between the second cam 24 and the second crank 23 is more stable.

As shown in fig. 1, the motor 5 is preferably transversely disposed at the lower side of the middle part of the frame 1 in this embodiment, so that the components at both sides of the motor 5 can have almost equal installation space, so that the components such as the thread trimming component 2, the presser foot lifting component 3 and the needle pitch adjusting component 4 can more reasonably utilize the installation space in the frame 1.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A needle pitch adjusting mechanism of a sewing machine is characterized in that a motor (5) is arranged at the lower part of a frame, a first output shaft (7) of the motor is used for driving a swinging seat (9) of a needle pitch adjusting component (4),

a first supporting shaft (10) is arranged on one side of the swinging seat (9), and one end of the first supporting shaft (10) drives the swinging seat (9) to swing within a set angle; the other end of the first support shaft (10) extends towards the position of the motor;

a transmission component is arranged between the first supporting shaft (10) and the first output shaft (7),

the transmission assembly includes:

a first toggle piece (11) provided with a first sliding groove (12);

a first crank (8) with one end provided with a slide block (13), the slide block (13) sliding in the first chute (12);

the first toggle piece (11) and the first crank (8) are respectively fixed on the first supporting shaft (10) or the first output shaft (7).

2. A needle pitch adjusting mechanism of a sewing machine according to claim 1, wherein the first support shaft (10) and the first output shaft (7) are arranged vertically in a vertical plane and arranged back and forth in a horizontal plane.

3. A needle pitch adjusting mechanism of a sewing machine according to claim 1, wherein a second supporting shaft (19) is provided at the other side of the swing seat (9); the first supporting shaft (10) and the second supporting shaft (19) are arranged on the same axis and respectively extend into two side parts of the swinging seat (9);

the first support shaft (10) is also provided with a second toggle piece (20), and the second toggle piece (20) is provided with a second sliding groove (21);

the side part of the swing seat (9) close to the first supporting shaft (10) is provided with a toggle pin (22), and the toggle pin (22) is arranged in the second sliding groove (21).

4. A presser foot lifting and gauge needle adjusting mechanism of a sewing machine, characterized by comprising the gauge needle adjusting mechanism of any one of claims 1-3, and further comprising a presser foot lifting assembly (3);

the presser foot lifting assembly (3) comprises:

a first cam (14) mounted on the first output shaft (7);

the duplex swing rod (15) is rotatably arranged on the rack (1); the duplex swing rod (15) is provided with a first swing arm (16) and a second swing arm (17); the swing arm end of the first swing arm (16) is hinged with a pressure foot lifting connecting rod, and the swing arm end of the second swing arm (17) is abutted against the first cam (14).

5. The presser foot and gauge adjustment mechanism of sewing machine according to claim 4, characterized in that said double oscillating bar (15) is disposed below the first toggle member (11), and the first toggle member (11) is located between the first swing arm (16) and the second swing arm (17) of the double oscillating bar (15).

6. The presser foot lifting and needle distance adjusting mechanism of sewing machine as claimed in claim 4, wherein a rotating shaft (28) is provided through said double oscillating bar (15), and said double oscillating bar (15) rotates around said rotating shaft (28);

and a return spring (29) for resetting the presser foot is arranged on the rotating shaft (28), one end of the return spring (29) is arranged on the rack (1), and the other end of the return spring is arranged on the duplex oscillating bar (15).

7. The presser foot lifting and gauge adjustment mechanism for sewing machine according to claim 4, wherein said first cam (14) comprises a rotating end (26) and a protruding end (27), wherein said rotating end (26) is connected to said first output shaft (7), and said protruding end (27) is used for toggling said second swing arm (17);

the first cam (14) is provided with a working curved surface and a non-working curved surface, the working curved surface is the circumferential surface of the protruding end (27), and the non-working curved surface is the circumferential surface of the rotating end (26).

8. A thread trimming, presser foot lifting and gauge needle adjusting mechanism of a sewing machine, characterized by comprising the presser foot lifting and gauge needle adjusting mechanism of any one of claims 4 to 7, and further comprising a thread trimming assembly;

a second output shaft (6) of the motor (5) extends forwards and drives the thread trimming component (2),

a first output shaft (7) of the motor (5) extends backwards and drives the presser foot lifting assembly (3) and the needle pitch adjusting assembly (4);

the thread trimming assembly comprises:

a second cam (24) for moving the thread cutting spool (31) and the thread cutting crank (32);

a second crank (23) mounted on a second output shaft (6) of the motor; the second crank (23) is used for driving the second cam (24);

a through hole (25) is formed in the second cam (24), one end of the second crank (23) is arranged in the through hole (25), and the working curved surface of the second cam (24) is the inner wall of the through hole (25).

9. The thread trimming, presser foot lifting and gauge adjustment mechanism for sewing machines according to claim 8, characterized in that said motor (5) is arranged transversely on the lower side of the middle of the frame (1).

10. A sewing machine characterized by comprising a needle pitch adjusting mechanism of a sewing machine according to any one of claims 1 to 3.

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