CN108796841B

CN108796841B - Sewing machine

Info

Publication number: CN108796841B
Application number: CN201810699811.3A
Authority: CN
Inventors: 柯祥林; 祝书伟; 郑吉�
Original assignee: Jack Sewing Machine Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2018-06-29
Filing date: 2018-06-29
Publication date: 2021-01-05
Anticipated expiration: 2038-06-29
Also published as: CN108796841A

Abstract

The invention belongs to the technical field of sewing equipment, in particular to a sewing machine; the backstitch device comprises a needle pitch adjusting stud, an adjuster shaft, a needle pitch adjuster fixed on the adjuster shaft, and a swing seat arranged on a bottom plate in a swinging mode through a first positioning pin and a second positioning pin, wherein the upper end of a backstitch connecting rod is connected to the needle pitch adjuster, the lower end of the backstitch connecting rod is connected to the swing seat, the swing seat is also connected with the lower end of a backstitch pull rod, the backstitch pull rod and the backstitch connecting rod are both connected to the same end of the swing seat, the upper end of the backstitch pull rod is hinged to an iron core of a backstitch electromagnet through a backstitch crank, the backstitch crank is fixedly arranged on a backstitch wrench shaft, the backstitch wrench shaft is driven to rotate by the backstitch electromagnet, and the middle of the; the invention simplifies the transmission chain of the forward and backward sewing mechanism, simplifies the complex part design and reduces the processing cost of parts.

Description

Sewing machine

The technical field is as follows:

the invention belongs to the technical field of sewing equipment, and particularly relates to a sewing machine.

Background art:

when the flat sewing machine is used for sewing, the initial stage and the final stage of a sewing thread are often used for reinforcing sewing materials by backstitch, and for the sake of stitch beauty, the stitch length of the backstitch is required to be consistent so that the sewing thread can be perfectly superposed.

The prior sewing machine has the following needle pitch forward and backward sewing switching structure: including gauge needle adjusting stud, regulator axle and fix the gauge needle regulator at the regulator epaxial, the gauge needle regulator is including the main part, be provided with V type groove in the one end of main part, the crank portion of being connected with the upper end of backfeeding connecting rod is provided with at the other end of main part, the lower extreme of main part between V type groove and crank portion is provided with the fork portion, be provided with the spout at the fork portion, be provided with the backstitch crank on the backstitch trigger axle, be provided with the backstitch crank pin on the backstitch crank, the backstitch crank pin sets up in the spout of gauge needle regulator, still be provided with on the backstitch crank and be used for hanging the extension spring connecting portion of establishing the extension spring that resets, the one end of extension spring that resets is hung and is established on extension. The lower end of the backward feeding connecting rod is connected with a swing seat, the swing seat is rotatably connected to the bottom plate through a left pin and a right pin, and the swing seat, the long swing plate, the short swing plate and the feeding connecting rod transmit the driving force of the upper shaft to the feeding shaft together.

From the top, the stitch length regulator and the backstitch crank in the existing structure have complex structures, high processing cost, redundant transmission chain of the whole structure and complex structure.

The invention content is as follows:

the invention aims to provide a sewing machine which simplifies a part structure and a needle pitch forward and backward sewing switching structure.

The invention is realized by the following steps:

the utility model provides a sewing machine, includes gauge needle adjusting stud, regulator axle and fixes gauge needle regulator on the regulator axle, through first locating pin and the swing seat of second locating pin swing setting on the bottom plate, the upper end of backstepping material connecting rod is connected on the gauge needle regulator, and the lower extreme of backstepping material connecting rod is connected on the swing seat, still is connected with the lower extreme of backstitch pull rod on the swing seat, backstitch pull rod and backstepping material connecting rod are all connected at the same one end of swing seat, and the upper end of backstitch pull rod is articulated through the iron core of backstitch crank and backstitch electro-magnet, the backstitch crank sets firmly on the backstitch wrench shaft, and the backstitch wrench shaft is rotated by the backstitch electro-magnet drive, the middle part of backstepping connecting rod is connected with the bottom plate.

In foretell sewing machine, the backstitch crank is Y-shaped structure, including long arm and short arm, and the one end of long arm is articulated with the upper end of backstitch pull rod, and the other end sets firmly on the backstitch spanner axle, is provided with the crank pin on the short arm of backstitch crank, and the short arm passes through the crank pin and is connected with the iron core of backstitch electro-magnet.

In the sewing machine, the long arm and the short arm are of an integral structure.

In the sewing machine, the iron core of the backstitch electromagnet is connected with the crank pin through the backstitch electromagnet connecting rod.

In the sewing machine described above, the short arm portion is provided with a crank pin mounting hole, and one end of the crank pin is in interference fit with the crank pin mounting hole.

In the sewing machine, a mounting hole is formed in one end of the needle pitch regulator, a through hole is formed in the upper end of the material reversing and feeding connecting rod, the upper end of the material reversing and feeding connecting rod penetrates through the mounting hole through an eccentric pin and is connected with the needle pitch regulator through the through hole, and the eccentric pin is fixed on the needle pitch regulator through a screw arranged along the radial direction of the mounting hole.

In the sewing machine, the swing seat is in a U shape, the inner walls of the outer ends of the two arms of the swing seat are respectively connected with the outer ends of the short swing plates, the inner ends of the two long swing plates are arranged between the inner ends of the two short swing plates, the lower end of the cloth feeding connecting rod is arranged between the inner ends of the two long swing plates, the lower end of the cloth feeding connecting rod, the inner ends of the two short swing plates and the inner ends of the two long swing plates are all fixedly arranged on the same mounting shaft, the upper end of the cloth feeding connecting rod is connected with the upper shaft, the outer ends of the two long swing plates are connected with the feeding shaft through the feeding shaft crank, and the driving force of the upper shaft is transmitted to the feeding shaft through the cloth feeding connecting rod, the swing seat, the long swing.

In the sewing machine, the backstitch pull rod and the reverse feeding connecting rod are arranged in parallel, and the lower ends of the backstitch pull rod and the reverse feeding connecting rod are respectively hinged to the two outer walls of the closed end of the swinging seat.

In a foretell sewing machine, the material reversing and feeding connecting rod includes the body of rod, down the body of rod, goes up the body of rod and is connected through turning portion between the body of rod down, goes up body of rod, turning portion and down body of rod formula structure as an organic whole, is provided with the extension spring hole in turning portion, and the one end of extension spring that resets is hung and is established on the extension spring hole.

Compared with the prior art, the invention has the outstanding advantages that:

the invention simplifies the transmission chain of the forward and backward sewing mechanism, simplifies the complex part design and reduces the processing cost of parts.

Description of the drawings:

FIG. 1 is a schematic diagram of the background art;

FIG. 2 is a schematic view of a background art backstitch crank;

FIG. 3 is a schematic diagram of a prior art gauge adjuster;

FIG. 4 is a schematic diagram of a background art mechanism;

FIG. 5 is a schematic perspective view of the present invention;

FIG. 6 is a front view of the present invention;

FIG. 7 is a perspective view of the invention with parts assembled;

FIG. 8 is a schematic view of the present invention in a normal seam condition;

FIG. 9 is a schematic view of the present invention in a backstitch position;

FIG. 10 is a schematic view of the gauge adjuster of the present invention;

FIG. 11 is a schematic view of the reverse feed linkage of the present invention;

FIG. 12 is a schematic view of the swing seat of the present invention;

FIG. 13 is a schematic view of the backstitch crank of the present invention;

FIG. 14 is a schematic diagram of the mechanism of the present invention;

FIG. 15 is a schematic view of the eccentric pin of the present invention.

In FIGS. 1-4: 1. a needle pitch adjusting stud; 2. a regulator shaft; 3. a needle pitch adjuster; 4. a main body; 5. a V-shaped groove; 6. a material reversing connecting rod; 7. a crank portion; 8. a fork portion; 9. a chute; 10. backstitch wrench shaft; 11. backstitch wrench cranks; 12. backstitch crank pin; 13. a tension spring connecting part; 14. a return tension spring; 15. a base plate; 16. a swing seat; 17. a material reversing connecting rod; 18. an upper shaft; 19. a feed shaft; 20. backstitch electromagnet.

In FIGS. 5-14: 21. a needle pitch adjusting stud; 22. a regulator shaft; 23. a needle pitch adjuster; 24. a first positioning pin; 25. a second positioning pin; 26. a swing seat; 27. a material reversing connecting rod; 28. backstitch pull rod; 29. backstitch crank; 30. backstitch electromagnets; 31. backstitch wrench shaft; 32. a return tension spring; 33. a long arm portion; 34. a short arm portion; 35. a crank pin; 36. backstitch electromagnet connecting rods; 37. mounting holes; 38. an eccentric pin; 39. an eccentric pin head; 40. a first pin shaft; 41. a second pin shaft; 42. a support arm; 43. a short swing plate; 44. a long swing plate; 45. a cloth feeding connecting rod; 46. an upper shaft; 47. a feed shaft crank; 48. a feed shaft; 49. a rod body is arranged; 50. a lower rod body; 51. a corner portion; 52. a tension spring hole.

The specific implementation mode is as follows:

the invention is further described below in specific embodiments, with reference to fig. 5-15:

a sewing machine comprises a needle pitch adjusting stud 21, an adjuster shaft 22, a needle pitch adjuster 23 fixed on the adjuster shaft 22, and a swing seat 26 arranged on a bottom plate (not shown) through a first positioning pin 24 and a second positioning pin 25 in a swing mode. The adjusting stud 21 is rotatably mounted in a housing (not shown) by means of a screw thread for limiting the needle gage adjuster 23. The regulator shaft 22 is rotatably arranged in the casing, and the needle pitch regulator 23 is fixedly connected with the regulator shaft 22 and can synchronously rotate along with the regulator shaft 22. The upper end of the backstitch connecting rod 27 is connected on the gauge length adjuster 23, the lower end of the backstitch connecting rod 27 is connected on the swing seat 26, the swing seat 26 is further connected with the lower end of the backstitch pull rod 28, the backstitch pull rod 28 and the backstitch connecting rod 27 are both connected at the same end of the swing seat 26, the upper end of the backstitch pull rod 28 is hinged to an iron core of the backstitch electromagnet 30 through a backstitch crank 29, the backstitch crank 29 is fixedly arranged on a backstitch wrench shaft 31, the backstitch wrench shaft 31 is driven to rotate by the backstitch electromagnet 30, the backstitch wrench shaft 31 is rotatably arranged in a machine shell, and the backstitch electromagnet 30 is fixedly installed in the machine shell. The middle part of the material reversing and feeding connecting rod 27 is connected with the bottom plate through a return tension spring 32. In actual use, the specific position of the return tension spring 32 connected to the bottom plate depends on the space.

As shown in fig. 7-9 and 13, the backstitch crank 29 is of a fork-shaped structure, and includes a long arm portion 33 and a short arm portion 34, one end of the long arm portion 33 is hinged to the upper end of the backstitch pull rod 28, the other end is fixedly connected to the backstitch wrench shaft 31, a crank pin 35 is disposed on the short arm portion 34 of the backstitch crank 29, and the short arm portion 34 is connected to the iron core of the backstitch electromagnet 30 through the crank pin 35. The invention also simplifies the structure of the backstitch crank 29, is convenient to install, reduces the processing difficulty and reduces the processing cost.

Furthermore, the long arm part 33 and the short arm part 34 are of an integrated structure, and the processing is convenient.

Further, the iron core of the backstitch electromagnet 30 is connected to the crank pin 35 through a backstitch electromagnet connecting rod 36. Specifically, both ends of the backstitch electromagnet connecting rod 36 are respectively provided with a connecting hole for connecting with the iron core of the backstitch electromagnet 30 and a connecting hole for connecting with the crank pin 35. During installation, the crank pins 35 are inserted into the corresponding connecting holes. Since the positions of the backstitch electromagnet 30 and the backstitch crank 29 are fixed, the crank pin 35 does not need to be axially limited in the corresponding connecting hole.

Further, the short arm portion 34 of the present invention is provided with a crank pin mounting hole, and one end of the crank pin 35 is in interference fit with the crank pin mounting hole. Of course, the crank pin 35 may be fixed by a screw connection, welding, glue, etc. instead of the interference fit plug connection.

When the iron core extends outwards, the backstitch electromagnet connecting rod 36 applies force to the backstitch crank 29 through the crank pin 35, so that the backstitch wrench shaft 31 is driven to rotate, and the lifting of the backstitch connecting rod 27 is achieved.

The backstitch electromagnet 30 of the present invention may be replaced with a cylinder, an electric push rod, or the like.

As shown in fig. 5 to 10, one end of the needle pitch regulator 23 of the present invention is provided with a mounting hole 37, the upper end of the material reversing connecting rod 27 is provided with a through hole, the upper end of the material reversing connecting rod 27 passes through the mounting hole 37 and is connected with the needle pitch regulator 23 through an eccentric pin 38, and the eccentric pin 38 is fixed on the needle pitch regulator 23 through a screw arranged along the radial direction of the mounting hole 37. Compared with the existing needle pitch regulator 23, the structure of the needle pitch regulator 23 of the invention simplifies the structure, reduces the processing difficulty and reduces the processing cost.

As shown in fig. 15, the eccentric pin 38 according to the present invention includes an eccentric pin head 39, a first pin 40 is disposed in the center of one end surface of the eccentric pin head 39, a second pin 41 is disposed on the outer end surface of the first pin 40, the upper end of the material reversing connection rod 27 is disposed on the first pin 40, the second pin 41 is inserted into the mounting hole 37 of the needle pitch adjuster 23, and the second pin 41 is fixedly connected to the needle pitch adjuster 23 by a screw. The eccentricity between the axes of the first pin shaft 40 and the second pin shaft 41 is designed according to actual conditions, and the eccentricity is 0.7 ± 0.015mm in this embodiment.

As shown in fig. 5, 7 and 12, the swing base 26 is U-shaped, and the inner walls of the outer ends of the two arms 42 of the swing base 26 are connected to the outer ends of the short swing plates 43, the inner ends of the two long swing plates 44 are disposed between the inner ends of the two short swing plates 43, the lower end of the cloth feeding link 45 is disposed between the inner ends of the two long swing plates 44, the lower end of the cloth feeding link 45, the inner ends of the two short swing plates 43 and the inner ends of the two long swing plates 44 are all fixed on the same mounting shaft, the upper end of the cloth feeding link 45 is connected to the upper shaft 46, the outer ends of the two long swing plates 44 are connected to the feeding shaft 48 through the feeding shaft crank 47, and the driving force of the upper shaft 46 is transmitted to the feeding shaft 48 through the cloth feeding link 45, the swing base 26, the long swing plates 44 and the.

As shown in fig. 5 and 7, in order to make the swing seat 26 uniformly stressed, the lower ends of the backstitch pull rod 28 and the reverse feeding connecting rod 27 are respectively hinged on the two outer walls of the closed end of the swing seat 26.

Specifically, as shown in fig. 11, the material reversing and feeding connecting rod 27 includes an upper rod 49 and a lower rod 50, the upper rod 49 and the lower rod 50 are connected through a turning portion 51, the upper rod 49, the turning portion 51 and the lower rod 50 are of an integrated structure, a tension spring hole 52 is formed in the turning portion 51, and one end of the return tension spring 32 is hung on the tension spring hole 52. The shape of the material reversing connecting rod 27 of the invention can prevent the reset tension spring 32 from interfering with the material reversing connecting rod 27 when the spring is hung at the tension spring hole 52.

The working principle of the invention is as follows:

1. during normal sewing, the backstitch electromagnet 30 is in a power-off state, the reset tension spring 32 applies a downward pulling force to the backstitch connecting rod 27, the backstitch connecting rod 27 drives the needle pitch adjuster 23 to rotate around the adjuster shaft 22 until the lower surface of a V-shaped groove on the needle pitch adjuster 23 is abutted and limited with the needle pitch adjusting stud 21, and the left and right positions of the needle pitch adjusting stud 21 are the current needle pitch. The principle of the needle pitch adjustment is the same as that of the existing flat sewing machine, and the invention is not described in detail.

2. When automatically switching backstitch: the backstitch electromagnet 30 is electrified, the iron core of the backstitch electromagnet 30 pushes the backstitch electromagnet connecting rod 36 leftwards, and meanwhile, the backstitch electromagnet connecting rod 36 acts on the backstitch crank 29, so that the backstitch crank 29 rotates by taking the backstitch wrench shaft 31 as an axis. When the backstitch crank 29 rotates, the long arm part 33 drives the backstitch pull rod 28 to move upwards, the backstitch pull rod 28 pulls the swing seat 26 to rotate around the first positioning pin 24 and the second positioning pin 25, and at the moment, the backstitch connecting rod 27 with the lower end hinged to the swing seat 26 drives the needle pitch regulator 23 to rotate around the regulator shaft 22 under the driving of the swing seat 26 until the upper surface of the V-shaped groove on the needle pitch regulator 23 is abutted to the needle pitch regulating stud 21. The above-mentioned complete process has realized the automatic switch-over of a certain stitch length of positive sewing to the corresponding stitch length of backstitch.

The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so: all equivalent changes made according to the shape, structure and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a sewing machine, includes gauge needle regulation double-screw bolt (21), regulator axle (22) and fix gauge needle regulator (23) on regulator axle (22), through swing seat (26) of first locating pin (24) and second locating pin (25) swing setting on the bottom plate, its characterized in that: the upper end of refeed material connecting rod (27) is connected on gauge needle regulator (23), and the lower extreme of refeed material connecting rod (27) is connected on swing seat (26), still is connected with the lower extreme of backstitch pull rod (28) on swing seat (26), backstitch pull rod (28) and refeed material connecting rod (27) all are connected at the same one end of swing seat (26), and the iron core of backstitch crank (29) and backstitch electro-magnet (30) is articulated through backstitch crank (29) in the upper end of backstitch pull rod (28), backstitch crank (29) set firmly on backstitch wrench shaft (31), and backstitch wrench shaft (31) are rotated by backstitch electro-magnet (30) drive, the middle part of refeed material connecting rod (27) is connected with the bottom plate through extension spring that resets (32).

2. A sewing machine according to claim 1, wherein: the backstitch crank (29) is of a fork-shaped structure and comprises a long arm part (33) and a short arm part (34), one end of the long arm part (33) is hinged to the upper end of a backstitch pull rod (28), the other end of the long arm part is fixedly arranged on a backstitch wrench shaft (31), a crank pin (35) is arranged on the short arm part (34) of the backstitch crank (29), and the short arm part (34) is connected with an iron core of a backstitch electromagnet (30) through the crank pin (35).

3. A sewing machine according to claim 2, wherein: the long arm part (33) and the short arm part (34) are of an integrated structure.

4. A sewing machine according to claim 1 or 2, characterized in that: and an iron core of the backstitch electromagnet (30) is connected with a crank pin (35) through a backstitch electromagnet connecting rod (36).

5. A sewing machine according to claim 2, wherein: be provided with crank pin (35) mounting hole on short arm (34), the one end and the crank pin mounting hole interference fit of crank pin (35).

6. A sewing machine according to claim 1, wherein: one end of the needle pitch regulator (23) is provided with a mounting hole (37), the upper end of the material reversing and feeding connecting rod (27) is provided with a through hole, the upper end of the material reversing and feeding connecting rod (27) penetrates through the mounting hole (37) through an eccentric pin (38) to be connected with the needle pitch regulator (23) through the through hole, and the eccentric pin (38) is fixed on the needle pitch regulator (23) through a screw arranged along the radial direction of the mounting hole (37).

7. A sewing machine according to claim 1, wherein: the swing seat (26) is U-shaped, the inner walls of the outer ends of two arms (42) of the swing seat (26) are respectively connected with the outer ends of the short swing plates (43), the inner ends of the two long swing plates (44) are arranged between the inner ends of the two short swing plates (43), the lower end of the cloth feeding connecting rod (45) is arranged between the inner ends of the two long swing plates (44), the lower end of the cloth feeding connecting rod (45), the inner ends of the two short swing plates (43) and the inner ends of the two long swing plates (44) are fixedly arranged on the same mounting shaft, the upper end of the cloth feeding connecting rod (45) is connected with the upper shaft (46), the outer ends of the two long swing plates (44) are connected with the feeding shaft (48) through a feeding shaft crank (47), and the driving force of the upper shaft (46) is transmitted to the feeding shaft (48) through the cloth feeding connecting rod (45), the swing seat (26), the long swing plates (44) and the short swing plates (43.

8. A sewing machine according to claim 1, wherein: the lower ends of the backstitch pull rod (28) and the material reversing and feeding connecting rod (27) are respectively hinged on the two outer walls of the closed end of the swinging seat (26).

9. A sewing machine according to claim 8, wherein: the material reversing and feeding connecting rod (27) comprises an upper rod body (49) and a lower rod body (50), the upper rod body (49) is connected with the lower rod body (50) through a turning portion (51), the upper rod body (49), the turning portion (51) and the lower rod body (50) are of an integrated structure, a tension spring hole (52) is formed in the turning portion (51), and one end of a reset tension spring (32) is hung on the tension spring hole (52).