High-low synchronous transmission device of linking machine

Abstract

The utility model discloses a high-low synchronous transmission device of a linking machine. The needle arm shaft is movably installed in a support, the eccentric wheel and the needle swing lever are movably installed on the support, the needle arm shaft is fixedly sleeved with the shifting block, the needle arm shaft is sleeved with the spring, the two ends of the spring make contact with the inner wall of the support and the front side face of the shifting block respectively, and the connecting rod is connected between the shifting block and the eccentric wheel. The needle arm is provided with a curved needle, one end of the needle swing lever contacts with the rear side of the shifting block, the other end of the needle swing lever contacts with the outer surface of the eccentric wheel, and the needle arm shaft is arranged on the lower edge of the support. The connecting rod comprises a first rod body movably connected with the upper surface of the eccentric wheel, a second rod body movably connected with the shifting block and a connecting block which is connected between the first rod body and the second rod body and is vertically distributed, and the first rod body and the second rod body are vertically distributed in parallel; the needle swing lever comprises a lever main body and an extension block which is arranged at one end of the lever main body, extends downwards and is in contact with the rear side surface of the shifting block.

Description

Technical field:

[0001] The utility model relates to the technical field of tray sewing machines, in particular to a high and low synchronous transmission device for tray sewing machines. Background technology:

[0002] Sewing machines are one of the important equipment in the wool textile industry. They are used to sew knitted garments, collars, cuffs, etc. In order to simplify the structure of sewing machines and improve their working efficiency, people have made a lot of efforts and achieved great results. However, with the continuous emergence of new chemical fiber fabric styles and the continuous changes in people's needs, higher and higher requirements have been put forward for the performance of sewing machines. The original various sewing machine structures have gradually shown their disadvantages. At present, there are generally two types of sewing machines on the market, one of which is the ordinary low-speed double groove transmission type; the other is the high-speed double external cam type. The common point is that the film passing space is relatively small, which is not good for the sweater to pass through, and it is easy to get stuck and hang the product, causing economic losses.

[0003] For example, the Chinese utility model patent with patent number CN202322243117.X discloses a fixed bracket of a sewing machine, including a fixed bracket, a receiving hole is provided on the fixed bracket, a pin assembly is installed on the fixed bracket and located at the receiving hole, the middle part of the main shaft is located at the receiving hole, the main shaft drives the thread guide needle of the pin assembly to swing back and forth and left and right through a gear set, one end of the fixed bracket is provided with an extension arm and a support shaft, a thread pick-up assembly is installed on the extension arm and the support shaft, the front end of the main shaft is connected to the bearing plate shaft, and the main shaft drives the thread pick-up assembly to swing up and down and left and right through a cam set. The positioning shaft is arranged in the middle or upper middle part of the fixed bracket, and a cantilever is arranged at the end of the positioning shaft, and a thread guide needle adapted to the pin of the needle plate is arranged on the cantilever. The main shaft drives the first cam to rotate through the gear set, and the first cam pulls the positioning shaft to rotate through the adjusting rod and the traction arm, and the positioning shaft drives the thread guide needle of the cantilever to move in an arc up and down.

[0004] In this patent, the film feeding space is the space formed between the upper end of the pointer dial, the thread pick-up piece, the thread guide needle (i.e., the curved needle) and the lower end of the fixed bracket. If it is necessary to expand the size of the film feeding space, in order to ensure the normal operation and work quality of the sewing machine, the interval between the thread pick-up piece and the thread guide needle (i.e., the curved needle) cannot be adjusted, that is, only the height of the fixed bracket relative to the needle dial can be adjusted. Directly raising the fixed bracket relative to the needle dial requires increasing the cantilever fixedly connected to the thread guide needle, which will cause a significant change in the arc radius of the thread guide needle's swing, resulting in the need to adjust the size parameters of many parts such as the thread pick-up piece, which is extremely cumbersome to operate.

[0005] In view of this, the inventor proposes the following technical solution. Utility model content:

[0006] The utility model aims to overcome the deficiencies of the prior art and provide a high and low synchronous transmission device for a plate sewing machine.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions: the high and low synchronous transmission device of the sewing machine includes a needle arm shaft movably installed in the bracket, an eccentric wheel and a needle swing lever movably installed on the bracket, a pull block fixedly sleeved with the needle arm shaft, a spring sleeved on the needle arm shaft and having two ends respectively in contact with the inner wall of the bracket and the front side of the pull block, and a connecting rod connected between the pull block and the eccentric wheel, a needle arm is arranged at the end of the needle arm shaft, and the needle arm is provided with a curved needle, one end of the needle swing lever is in contact with the rear side of the pull block, and the other end of the needle swing lever is in contact with the outer surface of the eccentric wheel, and the needle arm shaft is arranged at the lower edge of the bracket; the connecting rod includes a first rod body movably connected to the upper surface of the eccentric wheel, a second rod body movably connected to the pull block, and a connecting block connected between the first rod body and the second rod body and vertically distributed, the first rod body and the second rod body are distributed in parallel up and down; the needle swing lever includes a lever body and an extension block arranged at one end of the lever body and extending downward and used to contact the rear side of the pull block.

[0008] Furthermore, in the above technical solution, a wear-resistant sheet is fixed to the rear side of the pull block; the extension block is in direct contact with the wear-resistant sheet, or the extension block is in rolling contact with the wear-resistant sheet through a first rolling member.

[0009] Furthermore, in the above technical solution, the first rolling element is a bearing, the spiral passes through the inner circular hole of the bearing and is fixed to the lower end of the extension block, and the outer surface of the bearing protrudes beyond the outer side surface of the extension block.

[0010] Furthermore, in the above technical solution, the extension block is installed on one end of the lever body in a manner that the front and rear positions can be adjusted.

[0011] Furthermore, in the above technical solution, the extension block includes an extension block main body and a screw portion integrally fixed to the outer side of the upper end of the extension block main body, one end of the lever main body is provided with transversely distributed through holes, the first rolling member is provided at the lower end of the extension block main body, the screw portion is passed through the through holes, and the screw portion is also spirally installed with a first nut and a second nut, the first nut and the second nut are clamped and fixed on both sides of one end of the lever main body, and the position relative to one end of the lever main body can be adjusted by cooperating with the screw portion through the first nut and the second nut.

[0012] Furthermore, in the above technical solution, a pressing plane is also provided on the screw portion, and a screw hole penetrating through the through hole is opened downward on the upper surface of one end of the lever body, and a headless screw is spirally fixed in the screw hole and presses against the pressing plane to lock the screw portion in the through hole.

[0013] Furthermore, in the above technical solution, a rotatable second rolling member is provided at the other end of the lever body, and an outer surface of the second rolling member forms a rolling contact with an outer surface of the eccentric wheel.

[0014] Furthermore, in the above technical solution, a first rotating body that can rotate radially and axially is provided in the end of the first rod body, and the first rotating body is fixed to the upper surface of the eccentric wheel by a first screw; a second rotating body that can rotate radially and axially is provided in the end of the second rod body, and the second rotating body is fixedly connected to the pull block by a second screw.

[0015] Furthermore, in the above technical solution, the connecting block includes a connecting block main body, a first threaded section integrally fixedly connected to one side surface of the upper end of the connecting block main body, and a second threaded section integrally fixedly connected to the other side surface of the lower end of the connecting block main body, the first rod body is spirally fixed to the first threaded section and the distance relative to the connecting block main body can be adjusted, and the second rod body is spirally fixed to the second threaded section and the distance relative to the connecting block main body can be adjusted.

[0016] Furthermore, in the above technical solution, a third nut is spirally installed on the first threaded segment, and the third nut presses against the end of the first rod to lock it; a fourth nut is spirally installed on the second threaded segment, and the fourth nut presses against the end of the second rod to lock it.

[0017] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art: the utility model arranges the needle arm shaft at the lower edge of the bracket, so that after the bracket is raised relative to the needle disk to increase the size of the film transfer space, the relative height of the needle arm shaft and the needle disk will not change or will change very little, thereby ensuring that the arc radius of the swing of the bent needle remains unchanged or changes very little. When the bracket is raised relative to the needle disk, the height of the eccentric wheel will also be raised accordingly. At this time, without changing the relative position and size of the needle arm shaft and the pull block, only the structure of the connecting rod and the needle swing lever is changed, thereby enabling the eccentric wheel to drive the pull block and the needle arm shaft to move and work according to the original trajectory, thereby achieving the purpose of minimizing the number of parts whose sizes need to be changed, so that there is no need to replace too many parts. This can also reduce production costs and improve production efficiency. Description of the drawings:

[0018] Figure 1 It is a three-dimensional diagram of the utility model;

[0019] Figure 2 It is a three-dimensional diagram of the disc sewing machine made by the utility model;

[0020] Figure 3 It is a stereogram of another viewing angle of the utility model;

[0021] Figure 4It is an assembly diagram of the connecting rod and the eccentric wheel in the utility model;

[0022] Figure 5 It is a three-dimensional diagram of the needle swing lever in the utility model;

[0023] Figure 6 It is a three-dimensional diagram of the extension block in the utility model;

[0024] Figure 7 It is a stereogram of the connecting block in the utility model. Specific implementation method:

[0025] The utility model is further described below in conjunction with specific embodiments and drawings.

[0026] See Figure 1-7 As shown, a high and low synchronous transmission device of a sewing machine is provided, which comprises: a needle arm shaft 21 movably mounted in a bracket 1, an eccentric wheel 22 and a needle swing lever 23 movably mounted on the bracket 1, a pull block 24 fixedly sleeved with the needle arm shaft 21, a spring 25 sleeved on the needle arm shaft 21 and having two ends respectively in contact with the inner wall of the bracket 1 and the front side of the pull block 24, and a connecting rod 26 connected between the pull block 24 and the eccentric wheel 22, a needle arm 27 is provided at the end of the needle arm shaft 21, and the needle arm 27 is provided with a curved needle 271, one end of the needle swing lever 23 is in contact with the rear side of the pull block 24, and the other end of the needle swing lever 23 is in contact with the outer surface of the eccentric wheel 22, and when working, the eccentric wheel 22 is moved by the pull block 24. After being driven to rotate, the pull block 24 is pulled to rotate through the connecting rod 26, thereby driving the needle arm shaft 21 to rotate. When the needle arm shaft 21 rotates, it drives the needle arm 27 installed at its end and the curved needle 271 on the needle arm 27 to swing up and down in an arc. At the same time, the eccentric wheel 22 will push the needle swing lever 23 to swing in the horizontal direction while rotating, thereby pressing and pushing the pull block 24 and the needle arm shaft 21 to slide in the axial direction. When the pull block 24 no longer presses and pushes the pull block 24, the pull block 24 passes through the elastic force range of the spring 25, thereby driving the needle arm shaft 21 to slide back and forth in the axial direction, thereby completing the needle insertion and removal action, and then cooperating with the small needle on the needle disk.

[0027] When the height of the bracket 1 is adjusted relative to the needle plate to increase the film feeding space 10, in order to ensure that the arc radius of the swing of the curved needle 271 remains unchanged or changes very little, and to minimize the number of parts whose sizes need to be changed, so that there is no need to replace too many parts, reduce production costs, and improve production efficiency, the utility model makes the following improvements:

[0028] The needle arm shaft 21 is arranged at the lower edge of the bracket 1, so that after the bracket 1 is raised relative to the needle disk, the relative height of the needle arm shaft 21 and the needle disk will not change or will change very little, thereby ensuring that the arc radius of the swing of the curved needle 271 remains unchanged or changes very little. When the bracket 1 is raised relative to the needle disk, the height of the eccentric wheel 22 will also be raised accordingly. At this time, without changing the relative position and size of the needle arm shaft 21 and the pull block 24, only the structure of the connecting rod 26 and the needle swing lever 23 is changed, thereby enabling the eccentric wheel 22 to drive the pull block 24 and the needle arm shaft 21 to move and work according to the original trajectory. Specifically, the connecting rod 26 includes a first rod body 261 movably connected to the upper surface of the eccentric wheel 22, a second rod body 262 movably connected to the pull block 24, and a connecting block 263 connected between the first rod body 261 and the second rod body 262 and vertically distributed. 61 and the second rod body 262 are distributed in parallel up and down, so that the connecting rod 26 is a Z-shaped rod body, which can pull the pull block 24 to operate according to the original trajectory when the eccentric wheel 22 rotates, and the connecting rod 26 has a stable structure; the needle swing lever 23 includes a lever body 231 and an extension block 232 arranged at one end of the lever body 231 and extending downward and used to contact the rear side of the pull block 24. The lever body 231 is extended downward by the extension block 232, so that the pull block 24 can be stably pushed to slide, and then the pull block 24 and the needle arm shaft 21 are driven to operate according to the original trajectory. That is to say, by improving the structure of the connecting rod 26 and the needle swing lever 23, the eccentric wheel 22 drives the needle arm shaft 21 to rotate circumferentially and slide axially synchronously in a high and low synchronous transmission mode, thereby driving the needle arm 27 and the curved needle 271 on the needle arm 27 to complete the needle insertion and extraction actions.

[0029] In order to prevent the pull block 24 from wearing, the following improvements are made: a wear-resistant sheet 241 is fixed to the rear side of the pull block 24; the extension block 232 is in direct contact with the wear-resistant sheet 241, or the extension block 232 forms rolling contact with the wear-resistant sheet 241 through the first rolling member 233. This embodiment, as a preferred embodiment, adopts the scheme that the extension block 232 forms rolling contact with the wear-resistant sheet 241 through the first rolling member 233, and the friction force is small, which can reduce the wear of the wear-resistant sheet 241 and thus improve its service life. Among them, the first rolling member 233 is a bearing, which spirally passes through the inner circular hole of the bearing and is fixed to the lower end of the extension block 232, and the outer surface of the bearing protrudes beyond the outer side surface of the extension block 232.

[0030] In order to enable the extension block 232 to better press against the wear-resistant sheet 241 and the pull block 24, the utility model also makes the following improvements: the extension block 232 is installed at one end of the lever body 231 in a manner that the front and rear positions can be adjusted, that is, the tension of the extension block 232 in contact with the wear-resistant sheet 241 and the pull block 24 can be adjusted.

[0031] Specifically, the extension block 232 includes an extension block main body 2321 and a screw portion 2322 integrally fixed to the outer side of the upper end of the extension block main body 2321. One end of the lever main body 231 is provided with a transversely distributed through hole. The first rolling member 233 is arranged at the lower end of the extension block main body 2321. The screw portion 2322 is penetrated in the through hole, and the screw portion 2322 is also spirally installed with a first nut 2323 and a second nut 2324. The first nut 2323 and the second nut 2324 are clamped and fixed on both sides of one end of the lever main body 231, and the position relative to one end of the lever main body 231 can be adjusted by the first nut 2323 and the second nut 2324 cooperating with the screw portion 2322. The structure is extremely simple, and the position / interval size between the extension block 232 and one end of the lever main body 231 can be adjusted more conveniently, so as to adjust the tension of the extension block 232 in contact with the pressing wear-resistant plate 241 and the pull block 24.

[0032] In order to make the assembly of the screw part 2322 and the perforation more stable and to prevent the screw part 2322 from rotating relative to the perforation, the following design is also made: a top pressure plane 2320 is also provided on the screw part 2322, and a screw hole 2312 that passes through the perforation is downwardly opened on the upper surface of one end of the lever body 231, and a headless screw is spirally fixed to the screw hole 2312 and presses against the top pressure plane 2320 to lock the screw part 2322 in the perforation, thereby making the assembly of the screw part 2322 and the perforation more stable and to prevent the screw part 2322 from rotating relative to the perforation.

[0033] A rotatable second rolling member 2313 is provided at the other end of the lever body 231, and the outer surface of the second rolling member 2313 forms a rolling contact with the outer surface of the eccentric wheel 22, which can reduce friction and further reduce the wear of the eccentric wheel 22, thereby achieving the purpose of protecting the eccentric wheel 22 and increasing its product service life.

[0034] A first rotating body 264 capable of radial and axial rotation is provided at the end of the first rod body 261, and the first rotating body 264 is fixed to the upper surface of the eccentric wheel 22 by a first screw 265; a second rotating body 266 capable of radial and axial rotation is provided at the end of the second rod body 262, and the second rotating body 266 is fixedly connected to the pull block 24 by a second screw 267, so that when the eccentric wheel 22 rotates, it can pull the pull block 24 to swing stably through the connecting rod 26, even if the connecting rod 26 is offset during operation, it can be corrected by assembling the first rotating body 264 and the second rotating body 266, thereby ensuring the stability and accuracy of operation.

[0035] The connecting block 263 includes a connecting block body 2631, a first threaded section 2632 integrally fixedly connected to one side surface of the upper end of the connecting block body 2631, and a second threaded section 2633 integrally fixedly connected to the other side surface of the lower end of the connecting block body 2631. The first rod body 261 and the first threaded section 2632 are spirally fixed and the distance relative to the connecting block body 2631 can be adjusted. The second rod body 262 and the second threaded section 2633 are spirally fixed and the distance relative to the connecting block body 2631 can be adjusted. The assembly structure is extremely simple and it is also very easy to install.

[0036] A third nut 2634 is also screwed on the first threaded section 2632, and the third nut 2634 presses against the end of the first rod body 261 to lock it; a fourth nut 2635 is also screwed on the second threaded section 2633, and the fourth nut 2635 presses against the end of the second rod body 262 to lock it, thereby ensuring the stability of the assembly structure.

[0037] To sum up, the utility model arranges the needle arm shaft 21 at the lower edge of the bracket 1, so that after the bracket 1 is raised relative to the needle disk to increase the size of the film transfer space, the relative height of the needle arm shaft 21 and the needle disk will not change or will change very little, thereby ensuring that the arc radius of the swing of the bent needle 271 remains unchanged or changes very little. When the bracket 1 is raised relative to the needle disk, the height of the eccentric wheel 22 will also be raised accordingly. At this time, without changing the relative position and size of the needle arm shaft 21 and the pull block 24, only the structure of the connecting rod 26 and the needle swing lever 23 is changed, thereby enabling the eccentric wheel 22 to drive the pull block 24 and the needle arm shaft 21 to move and work according to the original trajectory, thereby achieving the purpose of minimizing the number of parts whose sizes need to be changed, so that there is no need to replace too many parts, which can also reduce production costs and improve production efficiency.

[0038] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A high and low synchronous transmission device for a plate sewing machine, comprising: A needle arm shaft (21) movably mounted in a bracket (1), an eccentric wheel (22) and a needle swing lever (23) movably mounted on the bracket (1), a pull block (24) fixedly sleeved on the needle arm shaft (21), a spring (25) sleeved on the needle arm shaft (21) and having two ends respectively in contact with the inner wall of the bracket (1) and the front side of the pull block (24), and a connecting rod (26) connected between the pull block (24) and the eccentric wheel (22), a needle arm (27) is provided at the end of the needle arm shaft (21), and the needle arm (27) is provided with a curved needle (271), one end of the needle swing lever (23) is in contact with the rear side of the pull block (24), and the other end of the needle swing lever (23) is in contact with the outer surface of the eccentric wheel (22), characterized in that: The needle arm shaft (21) is arranged at the lower edge of the bracket (1); the connecting rod (26) comprises a first rod body (261) movably connected to the upper surface of the eccentric wheel (22), a second rod body (262) movably connected to the pull block (24), and a connecting block (263) connected between the first rod body (261) and the second rod body (262) and vertically distributed, and the first rod body (261) and the second rod body (262) are vertically distributed; The needle swing lever (23) comprises a lever body (231) and an extension block (232) which is arranged at one end of the lever body (231), extends downward and is used to contact the rear side of the pull block (24).

2. A high and low synchronous transmission device for a plate sewing machine according to claim 1, characterized in that: A wear-resistant sheet (241) is fixed to the rear side of the pull block (24); the extension block (232) is in direct contact with the wear-resistant sheet (241), or the extension block (232) forms rolling contact with the wear-resistant sheet (241) through a first rolling member (233).

3. A high and low synchronous transmission device for a plate sewing machine according to claim 2, characterized in that: The first rolling element (233) is a bearing, which spirally passes through the inner circular hole of the bearing and is fixed to the lower end of the extension block (232), and the outer surface of the bearing protrudes outside the outer side surface of the extension block (232).

4. The high and low synchronous transmission device of a plate sewing machine according to claim 2, characterized in that: The extension block (232) is mounted on one end of the lever body (231) in a manner that allows for an adjustable front-rear position.

5. The high and low synchronous transmission device of a plate sewing machine according to claim 4, characterized in that: The extension block (232) comprises an extension block body (2321) and a screw rod portion (2322) integrally fixed to the outer side of the upper end of the extension block body (2321); one end of the lever body (231) is provided with transversely distributed through holes; the first rolling element (233) is provided at the lower end of the extension block body (2321); the screw rod portion (2322) is inserted into the through holes; and the screw rod portion (2322) is also spirally mounted with a first nut (2323) and a second nut (2324); the first nut (2323) and the second nut (2324) are clamped and fixed to both sides of one end of the lever body (231); and the position relative to one end of the lever body (231) can be adjusted by the first nut (2323) and the second nut (2324) in cooperation with the screw rod portion (2322).

6. A high and low synchronous transmission device for a plate sewing machine according to claim 5, characterized in that: The screw rod portion (2322) is also provided with a pressing plane (2320), and a screw hole (2312) penetrating the through hole is provided downwardly on the upper surface of one end of the lever body (231), and a headless screw is screwed into the screw hole (2312) and presses against the pressing plane (2320) to lock the screw rod portion (2322) in the through hole.

7. The high and low synchronous transmission device of a plate sewing machine according to claim 5, characterized in that: A rotatable second rolling member (2313) is provided at the other end of the lever body (231), and the outer surface of the second rolling member (2313) forms rolling contact with the outer surface of the eccentric wheel (22).

8. A high and low synchronous transmission device for a plate sewing machine according to any one of claims 1 to 7, characterized in that: A first rotating body (264) that can rotate radially and axially is disposed at the end of the first rod body (261), and the first rotating body (264) is fixed to the upper surface of the eccentric wheel (22) via a first screw (265); a second rotating body (266) that can rotate radially and axially is disposed at the end of the second rod body (262), and the second rotating body (266) is fixedly connected to the puller block (24) via a second screw (267).

9. A high and low synchronous transmission device for a plate sewing machine according to any one of claims 1 to 7, characterized in that: The connecting block (263) comprises a connecting block body (2631), a first threaded section (2632) integrally fixedly connected to one side surface of an upper end of the connecting block body (2631), and a second threaded section (2633) integrally fixedly connected to the other side surface of a lower end of the connecting block body (2631); the first rod body (261) and the first threaded section (2632) are screw-fixed and their distance relative to the connecting block body (2631) can be adjusted; the second rod body (262) and the second threaded section (2633) are screw-fixed and their distance relative to the connecting block body (2631) can be adjusted.

10. The high and low synchronous transmission device of a plate sewing machine according to claim 9, characterized in that: A third nut (2634) is also screwed onto the first threaded section (2632), and the third nut (2634) presses against the end of the first rod body (261) to lock it; a fourth nut (2635) is also screwed onto the second threaded section (2633), and the fourth nut (2635) presses against the end of the second rod body (262) to lock it.

Images