CN106222893B

CN106222893B - A pinch roller subassembly and sewing machine for sewing machine

Info

Publication number: CN106222893B
Application number: CN201610780357.5A
Authority: CN
Inventors: 孙林军; 孙来顺
Original assignee: Suzhou Zhicheng Machinery Co ltd
Current assignee: Suzhou Zhicheng Machinery Co ltd
Priority date: 2016-08-31
Filing date: 2016-08-31
Publication date: 2022-04-15
Anticipated expiration: 2036-08-31
Also published as: CN106222893A

Abstract

The invention discloses a pinch roller assembly for a sewing machine, which comprises an operating platform, a shell arranged on the operating plane and a sewing machine needle arranged on the shell, wherein the pinch roller assembly comprises a pinch roller which is rotatably arranged behind the sewing machine needle and can press the operating plane, a transmission assembly which drives the pinch roller to ascend or descend along with the sewing machine needle and a lifting assembly which controls the pinch roller to ascend or descend, and the pinch roller synchronously rolls when the sewing machine needle works.

Description

A pinch roller subassembly and sewing machine for sewing machine

Technical Field

The invention relates to the field of sewing machines, in particular to a pressing wheel assembly for a sewing machine and the sewing machine.

Background

At present, the existing sewing machine needs an operator to manually control the direction of a sewing thread in the sewing process, and the operation is difficult when thick cloth is encountered, so that the workload of a user is large.

Particularly in the aspect of cloth propulsion, the propulsion of the cloth needs to be completed within a short time when a needle of the sewing machine leaves the cloth cover, and the conventional sewing machine for thick and large cloth is difficult to automatically complete the propulsion of the cloth.

Disclosure of Invention

The invention aims to provide a pressing wheel assembly of a sewing machine capable of automatically propelling cloth and the sewing machine.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a pinch roller subassembly for sewing machine, sewing machine includes operation platform, sets up casing and setting on the operation plane are in sewing machine needle on the casing, pinch roller subassembly is including rotating the setting and be in behind the sewing machine needle and can compress tightly operation plane's pinch roller, drive the pinch roller is along with sewing machine needle's drive assembly and control the lifting unit that the pinch roller rises or descends, the pinch roller is in sewing machine needle during operation rolls in step.

Preferably, the sewing machine further comprises a main shaft for driving the sewing machine needle, and the main shaft also synchronously drives the pressing wheel to roll.

Further preferably, the transmission assembly comprises a support frame fixedly arranged on the housing, a transmission shaft rotatably arranged on the support frame and driven by the main shaft, and a swing crank shaft rotatably arranged below the transmission shaft, wherein an eccentric wheel is fixedly arranged on the transmission shaft, and an eccentric wheel connecting rod is rotatably sleeved outside the eccentric wheel; a swing crank is sleeved outside the swing crank shaft, and at least one-way bearing is arranged between the swing crank and the swing crank shaft; the lower end part of the eccentric wheel connecting rod is arranged in the sliding groove of the swinging crank in a sliding way.

Further preferably, the lifting assembly comprises a cylinder arranged on the shell, a roller frame shaft coaxially arranged on the support frame with the swing crank shaft, and a roller frame rotatably arranged on the roller frame shaft, one end of the roller frame is provided with a through hole for arranging the pressing wheel, the other end of the through hole is provided with a sliding groove, the cylinder comprises a cylinder body fixedly arranged on the shell and a cylinder shaft arranged in the cylinder body in a sliding manner, the lower end of the cylinder shaft extends out of the cylinder, and the lower end of the cylinder shaft is in sliding connection with the sliding groove of the roller frame shaft through a pin.

Further preferably, a roller shaft parallel to the roller frame shaft is arranged in a through hole in the roller frame, a first synchronous pulley is fixedly arranged at one end of the roller shaft, a second synchronous pulley is fixedly arranged at the other end of the pressing wheel, and a synchronous belt is arranged between the first synchronous pulley and the second synchronous pulley.

Further preferably, the upper end of the cylinder shaft extends out of the cylinder body, a guide rod extending upwards along the length direction of the cylinder shaft is fixedly arranged at the upper end of the cylinder shaft, a locking nut is arranged at the upper end part of the guide rod, and a pressure spring is arranged between the locking nut and the cylinder.

Further preferably, the pressure spring is sleeved on the guide rod.

Preferably, a cushion block with a smooth surface is arranged on the operating plane right below the pinch roller.

A sewing machine with the sewing machine pinch roller assembly.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

because the invention is provided with the pinch roller behind the sewing machine needle of the sewing machine, the pinch roller rotates along with the work of the sewing machine needle, and the cloth can be pushed forwards through the rotation of the pinch roller, thereby achieving the technical purpose of automatic cloth feeding.

Drawings

FIG. 1 is an exploded view of a puck assembly according to a first embodiment;

FIG. 2 is an exploded view of the lift assembly of the first embodiment;

fig. 3 is an exploded view of the transmission assembly of the first embodiment.

In the above drawings: 1. a pinch roller; 2. a support frame; 3. a drive shaft; 4. a swing crank shaft; 5. an eccentric wheel; 51. an eccentric wheel connecting rod; 52. an extension pole; 53. a connector; 6. a swing crank; 7. a one-way bearing; 8. a roller frame shaft; 9. a roller frame; 10. a chute; 11. a cylinder body; 12. a cylinder shaft; 13. a roller shaft; 14. a first timing pulley; 15. a second timing pulley; 16. a synchronous belt; 17. a guide bar; 18. locking the nut; 19. a pressure spring; 20. a thrust washer; 21. a thrust needle bearing; 22. a needle bearing; 23. and a locking ring.

Detailed Description

The invention will be further described with reference to examples of embodiments shown in the drawings to which:

the first embodiment is as follows: referring to the attached drawing 1, the utility model provides a sewing machine includes operation platform, set up the casing on operation plane and set up sewing machine needle and the pinch roller subassembly that is used for the suture on the casing, the pinch roller subassembly is including rotating pinch roller 1 that sets up behind the sewing machine needle and can compress tightly operation plane, drive pinch roller 1 is along with the transmission assembly of sewing machine needle and the lifting unit that control pinch roller 1 rises or descends, pinch roller 1 rolls in sewing machine needle during operation in step, operation plane is provided with the cushion of surperficial smoothness under pinch roller 1, cloth on the operation plane can be dragged by the pinch roller.

Referring to fig. 3, the driving assembly includes a supporting frame 2 fixed on the housing, a driving shaft 3 rotatably installed on the supporting frame 2 and driven by the main shaft of the sewing machine, and a swinging crank shaft 4 rotatably installed below the driving shaft 3. The transmission shaft 3 is driven by a main shaft of a sewing machine needle, so that the pressing wheel 1 synchronously rotates when the sewing machine works. An eccentric wheel 5 is fixedly arranged on the transmission shaft 3, an eccentric wheel connecting rod 51 is rotatably sleeved outside the eccentric wheel 5, and the eccentric wheel connecting rod 51 further comprises an extension rod 52 and a connecting head 53 which are arranged at the lower part of the eccentric wheel connecting rod; a swing crank 6 is sleeved outside the swing crank shaft 4, two one-way bearings 7 are arranged between the swing crank 6 and the swing crank shaft 4, the one-way bearings 7 are one-way needle bearings in the embodiment, and outer rings of the two one-way needle bearings are locked with the swing crank 6 by a locking ring 23; the lower end of the eccentric connecting rod 51 is slidably disposed in the slide groove 10 of the rocking crank 6. Since the sewing needle is also driven by the eccentric device provided on the main shaft in the sewing machine, the eccentric connecting rod 51 can move up and down corresponding to the sewing needle when the main shaft rotates. In the present embodiment, the eccentric link 51 is displaced from the motion of the sewing needle by adjusting the position of the eccentric 5, i.e., the sewing needle moves upward when the eccentric link 51 moves downward. The swing crank 6 rotates back and forth along with the eccentric wheel connecting rod 51, and the one-way bearing 7 is arranged between the swing crank 6 and the swing crank shaft 4, so that the swing crank shaft 4 only rotates when the eccentric wheel connecting rod 51 moves downwards, namely, the swing crank shaft 4 only rotates when the sewing machine needle moves upwards to drive the pressing wheel 1, and the cloth is dragged by the pressing wheel 1 only in a time period when the sewing machine needle leaves the cloth.

Referring to fig. 2, the lifting assembly includes a cylinder disposed on the support frame 2, a roller frame shaft 8 disposed on the support frame 2 coaxially with the swing crank shaft 4, a roller frame 9 rotatably disposed on the roller frame shaft 8, a through hole for disposing the pressing roller 1 disposed at one end of the roller frame 9, and a sliding groove 10 disposed at the other end of the through hole, the cylinder includes a cylinder body 11 fixedly disposed on the housing and a cylinder shaft 12 slidably disposed in the cylinder body 11, a lower end of the cylinder shaft 12 extends out of the cylinder body 11, and a lower end of the cylinder shaft 12 is slidably connected to the sliding groove 10 of the roller frame shaft 8 through a pin. The roller frame 9 and the roller frame shaft 8 play a lever role, when the air cylinder is pressed down, the chute 10 end of the roller frame 9 is pressed down, and the end part of the roller frame 9, which is provided with the pressing wheel 1, is lifted downwards.

A roller shaft 13 parallel to the roller frame shaft 8 is arranged in a through hole on the roller frame 9, one end of the roller shaft 13 is fixedly provided with a pinch roller 1, the other end of the pinch roller is fixedly provided with a first synchronous belt pulley 14, the swing crank shaft 4 is provided with a second synchronous belt pulley 15, and a synchronous belt 16 is arranged between the first synchronous belt pulley 14 and the second synchronous belt pulley 15. Because the roller frame shaft 8 is arranged coaxially with the swing crank shaft 4, the distance from the roller shaft 13 to the swing crank shaft 4 is fixed no matter how the roller frame 9 rotates, so that the transmission of the transmission assembly is not influenced when the roller shaft 13 is lifted.

As shown in fig. 2, in the present embodiment, the roller shaft 13 is once sleeved with the pressure wheel 1, the thrust washer 20, the thrust needle bearing 21, the thrust washer 20, the needle bearing 22, the thrust washer 20, the thrust needle bearing 21, the thrust washer 20, and the first synchronous pulley 14.

In this embodiment, the upper end of the cylinder shaft 12 extends out of the cylinder body 11, a guide rod 17 extending upward along the length direction of the cylinder shaft 12 is fixedly arranged at the upper end of the cylinder shaft 12, a lock nut 18 is arranged at the upper end of the guide rod 17, and a compression spring 19 is arranged between the lock nut 18 and the cylinder body. When the surface of the cloth is uneven, the pressing wheel 1 can be always tightly attached to the surface of the cloth through the pressure spring 19.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a pinch roller assembly for sewing machine, sewing machine includes operation platform, sets up casing and setting on the operation plane are in sewing machine needle on the casing, pinch roller assembly is including rotating the setting and being in behind the sewing machine needle and can compress tightly operation plane's pinch roller, drive the pinch roller is along with sewing machine needle's drive assembly and control the lift assembly that the pinch roller ascended or descends, the pinch roller is in sewing machine needle during operation rolls in step, sewing machine still includes a drive sewing machine needle's main shaft, its characterized in that: the main shaft also synchronously drives the pinch roller to roll, the transmission assembly comprises a support frame fixedly arranged on the shell, a transmission shaft rotationally arranged on the support frame and driven by the main shaft, and a swinging crank shaft rotationally arranged below the transmission shaft, an eccentric wheel is fixedly arranged on the transmission shaft, and an eccentric wheel connecting rod is rotatably sleeved outside the eccentric wheel; a swing crank is sleeved outside the swing crank shaft, and at least one-way bearing is arranged between the swing crank and the swing crank shaft; the lower end part of the eccentric wheel connecting rod is arranged in the sliding groove of the swinging crank in a sliding way.

2. The pressure wheel assembly for a sewing machine of claim 1, wherein: the lifting assembly comprises a cylinder arranged on the shell, a roller frame shaft coaxially arranged on the support frame with the swing crank shaft, and a roller frame rotatably arranged on the roller frame shaft, wherein one end of the roller frame is provided with a through hole for arranging the pressing roller, the other end of the through hole is provided with a sliding groove, the cylinder comprises a cylinder body fixedly arranged on the shell and a cylinder shaft arranged in the cylinder body in a sliding manner, the lower end of the cylinder shaft extends out of the cylinder, and the lower end part of the cylinder shaft is in sliding connection with the sliding groove of the roller frame shaft through a pin.

3. The pressure wheel assembly for a sewing machine of claim 2, wherein: the roller frame is characterized in that a roller shaft parallel to the roller frame shaft is arranged in a through hole in the roller frame, one end of the roller shaft is fixedly provided with a first synchronous belt wheel fixed to the other end of the pressing wheel, a second synchronous belt wheel is arranged on the swing crank shaft, and a synchronous belt is arranged between the first synchronous belt wheel and the second synchronous belt wheel.

4. The pressure wheel assembly for a sewing machine of claim 2, wherein: the upper end of the cylinder shaft extends out of the cylinder body, a guide rod extending upwards along the length direction of the cylinder shaft is fixedly arranged at the upper end of the cylinder shaft, a locking nut is arranged at the upper end of the guide rod, and a pressure spring is arranged between the locking nut and the cylinder.

5. The pressure wheel assembly for a sewing machine of claim 4, wherein: the compression spring is sleeved on the guide rod.

6. The pressure wheel assembly for a sewing machine of claim 1, wherein: and a cushion block with a smooth surface is arranged on the operating plane under the pinch roller.

7. A sewing machine having a pinch roller assembly of the sewing machine of any of claims 1-6.