Power transmission device for a foot press

Abstract

The technical scheme belongs to the technical field of foot-rolling machines and specifically relates to a power transmission device of a foot-rolling machine, which is used for driving a bending needle shaft and a rotating shuttle shaft on the foot-rolling machine to operate. The foot-rolling machine comprises a rack and a motor. The motor is provided with a main shaft. The power transmission device comprises a first linkage element arranged between the main shaft and the rotating shuttle shaft. The first linkage element comprises a bevel gear one arranged on the main shaft, a transmission rod and a bevel gear two arranged on the rotating shuttle shaft. The transmission rod is provided with a gear one for engaging with the bevel gear one and a gear two for engaging with the bevel gear two at two ends of the transmission rod. The power transmission device further comprises a second linkage element arranged between the rotating shuttle shaft and the bending needle shaft. The second linkage element comprises a linkage shaft arranged on the rack, a bevel gear three arranged at an end of the linkage shaft and a synchronous assembly. The synchronous assembly comprises a synchronous wheel one arranged on the linkage shaft, a synchronous wheel two arranged at an end of the bending needle shaft and a synchronous belt tensioned between the synchronous wheel one and the synchronous wheel two. The bevel gear three is engaged with the gear two.

Description

Technical Field

[0001] This technical solution relates to the field of foot roller machine technology, and specifically refers to a power transmission device for a foot roller machine. Background Technology

[0002] A hem rolling machine is a type of sewing machine used to fold and roll the edges of jeans, casual pants, and other trousers. It automatically rolls the edges of the fabric inward and wraps them in two to three layers, then uses sewing stitches (such as lockstitch or chain stitch) to sew them in place.

[0003] For example, Chinese patent CN215800348U discloses a novel foot-rolling machine, including a frame, a first motor located on the upper side of the frame, a main shaft on the first motor driving a needle rod, a bent needle shaft located on the lower side of the frame, a bent needle assembly at one end of the bent needle shaft, a first linkage between the bent needle shaft and the main shaft, the main shaft driving the bent needle shaft to rotate through the first linkage; a rotary hook shaft located on the lower side of the frame, a rotary hook assembly at one end of the rotary hook shaft; a second linkage between the rotary hook shaft and the main shaft, the main shaft driving the rotary hook shaft to work through the second linkage; the first linkage is a synchronous belt, a first synchronous pulley is located on the main shaft, a second synchronous pulley is located at one end of the bent needle shaft, and the synchronous belt is located between the first synchronous pulley and the second synchronous pulley.

[0004] In current rolling knitting machines, the main shaft drives the synchronous pulley, which is transmitted to the synchronous pulley on the lower shaft (curved needle shaft) via a synchronous belt to achieve synchronous rotation speed and ensure normal operation. To ensure that the sewn products have stable and beautiful stitches, it is necessary to strictly control the cumulative error of the hole distance between the upper shaft hole (machine head) and the lower shaft hole (base plate). Excessive error will reduce the accuracy of the synchronous belt drive, resulting in insufficient matching accuracy between the synchronous pulley and the synchronous belt. Therefore, the hole distance between the upper shaft hole and the lower shaft hole of the machine frame needs to maintain a high precision requirement.

[0005] The existing synchronous belt assembly mode adopts a closed design. After assembly, the synchronous belt is put into use after relevant debugging and calibration to ensure normal operation. However, when the relevant mechanisms of the synchronous belt malfunction or require later maintenance, special tools must be used to disassemble the synchronous belt and other related components. The maintenance at the work site is difficult, and the operation of transporting and returning to the factory is troublesome, resulting in high assembly difficulty and long assembly time, which increases maintenance costs and reduces maintenance efficiency. Utility Model Content

[0006] This technical solution addresses the problem of low assembly efficiency caused by the difficulty in maintenance and disassembly of existing enclosed synchronous belt drive mechanisms, which results in high assembly difficulty and long assembly time. It provides a power transmission device for a roller hoist.

[0007] The purpose of this technical solution is achieved as follows: A power transmission device for a foot-rolling machine, used to drive the bending needle shaft and the rotary hook shaft on the foot-rolling machine, the foot-rolling machine including a frame and a motor mounted on the frame, the motor having a main shaft, characterized in that it includes: The first linkage component is disposed between the main shaft and the shuttle shaft. The first linkage component includes a bevel gear one disposed on the main shaft, a transmission rod and a bevel gear two disposed on the shuttle shaft. The two ends of the transmission rod are respectively provided with a gear component one for meshing with the bevel gear one and a gear component two for meshing with the bevel gear two. The second linkage component is located between the rotary hook shaft and the bending needle shaft. The second linkage component includes a linkage shaft mounted on the frame, a bevel gear three mounted at the end of the linkage shaft, and a synchronization component. The synchronization component includes a synchronization wheel one mounted on the linkage shaft, a synchronization wheel two mounted at the end of the bending needle shaft, and a synchronization belt tensioned between the synchronization wheel one and the synchronization wheel two. The bevel gear three meshes with the gear component two.

[0008] Through the above technical solution, when a power transmission device for a foot-rolling machine is in normal use, the bevel gear pair between the main shaft and the rotary hook shaft, and the two-stage transmission between the rotary hook shaft and the bending needle shaft through the combination of bevel gears and timing belts, realize the synchronization of the rotational speeds of the main shaft, rotary hook shaft, and bending needle shaft. The synchronization component is separately set on the rotary hook shaft and bending needle shaft sections of the power transmission chain, and is connected through an independently set linkage shaft and its end bevel gear three. This makes the synchronization component consisting of the timing belt and its associated timing pulley one and timing pulley two relatively external, allowing maintenance or replacement without disassembling the enclosed core components of the machine head, reducing the difficulty and time consumption of later maintenance, and improving maintenance efficiency.

[0009] Preferably, the tooth ratio of the second synchronous pulley to the first synchronous pulley is 2, such that the rotational speed ratio of the first synchronous pulley to the second synchronous pulley is 2.

[0010] Through the above technical solution, the gear ratio of synchronous pulley 2 to synchronous pulley 1 is set to 2:1, that is, every two rotations of synchronous pulley 1 is equivalent to one rotation of synchronous pulley 2, so as to achieve a speed ratio of 2:1 from the linkage shaft to the bending needle shaft. The bending needle shaft obtains twice the speed relative to the linkage shaft, matching the action response speed of the reciprocating motion frequency of the bending needle mechanism. This speed ratio adjustment is achieved entirely through mechanical transmission, reducing maintenance complexity.

[0011] Preferably, a cavity is provided below the frame, the second linkage is confined within the cavity, and the cavity is open at the lower part of the frame.

[0012] With the above technical solution, the cavity is open, which facilitates the installation, tensioning and maintenance of synchronous components. The operation can be carried out directly from the open opening at the bottom of the frame without any obstacles. There is no need to completely disassemble the machine head or transport special tools. The maintenance method is simpler, the maintenance efficiency is improved and the cost is reduced.

[0013] Preferably, the frame has a mounting hole that extends through the cavity to the outside. The rear end of the linkage shaft is provided with a bearing component. The cross-sectional area of ​​the bearing component and the first synchronous pulley are both adapted to be equal to the cross-sectional area of ​​the mounting hole, so that the linkage shaft and the first synchronous pulley can be installed into the cavity after passing through the mounting hole, and the bearing component is engaged in the mounting hole.

[0014] Through the above technical solution, the bevel gear three, the linkage shaft and the synchronous pulley one can be inserted into the cavity laterally through the mounting hole. Correspondingly, the bearing can be engaged in the mounting hole to automatically achieve axial positioning, making some parts of the second linkage modular for disassembly and assembly, further optimizing the structure and improving disassembly and assembly efficiency.

[0015] Preferably, the mounting hole is connected to a mounting cover.

[0016] Through the above technical solution, the mounting cover physically seals the mounting hole, reducing the intrusion of external dust and other impurities into the gap between the bearing component and the inner peripheral wall of the mounting hole, thus achieving a dustproof effect.

[0017] Preferably, the frame is further provided with a limiting hole, which is aligned with the mounting hole. A transmission sleeve is fitted over the linkage shaft, which is confined within the mounting hole. The linkage shaft rotates along the inner side of the transmission sleeve.

[0018] Through the above technical solution, the transmission sleeve, as an independent bushing, cooperates with the linkage shaft, so that the linkage shaft rotates only inside it without directly contacting the frame. The transmission sleeve is confined within the mounting hole and plays the role of supporting the linkage shaft. The other end is supported by a bearing and guided to the end of the linkage shaft, ensuring the stable rotation of the linkage shaft.

[0019] The key and beneficial technical effects of this technical solution compared to existing technologies are: 1. This technical solution uses an external second linkage component, which includes a linkage shaft, a bevel gear, and a synchronization assembly, to connect the transmission between the rotary hook shaft and the bending needle shaft. This allows for the maintenance of easily worn parts such as the timing belt and timing pulley without disassembling the core components of the machine head, ensuring transmission accuracy, enabling quick replacement, and reducing maintenance difficulty.

[0020] 2. This technical solution confines the second linkage component within an open cavity below the frame, allowing the installation, tensioning, debugging, and maintenance of the synchronization components to be carried out directly from the bottom of the frame without obstruction, without the need to disassemble the machine head or use special tools, thereby improving maintenance efficiency and reducing operation and maintenance costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this embodiment; Figure 2 This embodiment Figure 1Another perspective illustration; Figure 3 This is a partial exploded view of the second linkage component in the embodiment; Figure 4 This is a schematic diagram of part of the internal structure of the foot-rolling machine in the embodiment; Figure 5 This is a schematic diagram of the overall structure of the second linkage component in the embodiment; Figure 6 This is a partial cross-sectional view of the synchronization component in the embodiment.

[0022] Reference numerals: 1. Frame; 2. Motor; 3. Main shaft; 4. First linkage component; 41. Bevel gear one; 42. Transmission rod; 43. Bevel gear two; 51. Gear component one; 52. Gear component two; 6. Second linkage component; 61. Linkage shaft; 62. Bevel gear three; 63. Synchronization assembly; 631. Synchronization pulley one; 632. Synchronization pulley two; 633. Synchronization belt; 7. Cavity; 8. Mounting hole; 9. Bearing component; 10. Mounting cover; 11. Limiting hole; 12. Transmission sleeve; 100. Bending needle shaft; 200. Rotary shuttle shaft. Detailed Implementation

[0023] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings.

[0024] Example: See Figure 1 and Figure 4 A power transmission device for a sewing machine is disclosed, used to drive the looper shaft 100 and the shuttle shaft 200 on the sewing machine. The device includes a frame 1. Both the looper shaft 100 and the shuttle shaft 200 are rotatably mounted in the lower part of the frame 1. The looper shaft 100 and the shuttle shaft 200 are arranged parallel to each other, and their rotation axes are parallel to each other. A looper assembly can be installed at the front end of the looper shaft 100, and a shuttle assembly is provided at the front end of the shuttle shaft 200. The looper assembly and the shuttle assembly are existing technologies used for collaborative operation during the sewing process and will not be described in detail here. The frame 1 also includes a motor 2 located on the upper side of the frame 1. A main shaft 3 is connected to the output end of the frame 1 and is rotatably mounted relative to the frame 1. The rotation axis of the main shaft 3 is parallel to the rotation axis of the looper shaft 100.

[0025] It also includes a first linkage 4, which includes a bevel gear 41, a transmission rod 42, and a bevel gear 43. The bevel gear 41 is sleeved on the main shaft 3 and coaxially fixed thereto, with its tooth surface located on the side of the bevel gear 41 facing the motor 2. The transmission rod 42 is located inside the frame 1. In this embodiment, the transmission rod 42 is positioned by a shaft hole 1 through the head of the frame 1 and a shaft hole 2 through the bottom plate of the frame 1, so that both ends of the transmission rod 42 pass through the shaft hole 1 and the shaft hole 2, respectively. The transmission rod 42 is positioned between the shaft hole 1 and the shaft hole 2. Each section of the second rod is fitted with a bearing to guide the rotation of the transmission rod 42, whose rotation axis is perpendicular to the rotation axis of the main shaft 3. The upper end of the transmission rod 42 is coaxially fixed with a gear component 51, and the lower end is coaxially fixed with a gear component 52. Both gear component 51 and gear component 52 are preferably bevel gears. Gear component 51 meshes with bevel gear 41. Bevel gear 43 is fitted on the shuttle shaft 200 and coaxially fixed with it. Bevel gear 43 meshes with the tooth surface of gear component 52 on the side away from the motor 2, thereby realizing the power transmission of the main shaft 3.

[0026] See Figure 2 , Figure 3 as well as Figure 4 The bottom of the frame 1 is provided with a cavity 7, which opens downward to communicate with the outside. The cavity 7 is equipped with a second linkage 6, which includes a linkage shaft 61, a bevel gear 62 and a synchronization component 63. The frame 1 has a mounting hole 8, which is located at the lower part of the frame 1 and close to the side of the motor 2. It passes through the cavity 7 and the outside. A bearing 9 is sleeved on the linkage shaft 61. Its size is adapted to the mounting hole 8. The outer ring of the bearing 9 is engaged with the mounting hole 8 for fixed positioning, and its inner ring guides the rotation of the linkage shaft 61. The rotation axis of the linkage shaft 61 is perpendicular to the rotation axis of the transmission rod 42.

[0027] A mounting cover 10 is connected to the mounting hole 8 and is bolted to the frame 1. It can cover the bearing component 9 and block the mounting hole 8, thus preventing external impurities from entering from the mounting hole 8 on the side of the frame 1.

[0028] The frame 1 is also provided with a limiting hole 11, which is aligned with the mounting hole 8. The limiting hole 11 extends into the cavity 7. The linkage shaft 61 is provided with a transmission sleeve 12, the size of which is adapted to the limiting hole 11. The transmission sleeve 12 passes through the limiting hole 11, and the linkage shaft 61 passes through its inner side, so that the linkage shaft 61 can rotate relative to the transmission sleeve 12 inside the transmission sleeve 12, avoiding direct contact with the inner wall of the limiting hole 11 and reducing wear between the frame 1 and the linkage shaft 61.

[0029] The third bevel gear 62 is sleeved on the end of the linkage shaft 61 near the rotary shuttle shaft 200, and the third bevel gear 62 is coaxially fixed with the linkage shaft 61. The linkage shaft 61 and the rotary shuttle shaft 200 are aligned and set. The third bevel gear 62 meshes with the second gear component 52, so that the second bevel gear 43 and the third bevel gear 62 mesh on the tooth surfaces on opposite sides of the second gear component 52 respectively.

[0030] See Figure 4 , Figure 5 and Figure 6 The synchronization component 63 includes a first synchronization pulley 631, a second synchronization pulley 632, and a synchronization belt 633. The first synchronization pulley 631 is sleeved on the linkage shaft 61 and fixed coaxially thereto. The second synchronization pulley 632 is correspondingly fixed coaxially at the end of the bent needle shaft 100. The first synchronization pulley 631 and the second synchronization pulley 632 are on the same plane. The number of teeth of the second synchronization pulley 632 is greater than that of the first synchronization pulley 631. The ratio of the number of teeth of the second synchronization pulley 632 to the number of teeth of the first synchronization pulley 631 is 2. The first synchronization pulley 631 and the second synchronization pulley 632 are preferably synchronization pulleys with a tooth profile accuracy of 5m. In this embodiment, the first synchronization pulley 631 has 14 teeth and the second synchronization pulley 632 has 28 teeth, so that the rotation speed ratio of the first synchronization pulley 631 to the second synchronization pulley 632 is 2:1, so that two rotations of the first synchronization pulley 631 are equivalent to one rotation of the second synchronization pulley 632. The synchronization belt 633 is tensioned on the outside of the second synchronization pulley 632 and the first synchronization pulley 631 to realize power transmission.

[0031] When motor 2 drives main shaft 3 to rotate in a first direction (clockwise), main shaft 3 drives gear component 51 to rotate in a second direction (counterclockwise) via bevel gear 41. Subsequently, transmission rod 42 and gear component 52 also rotate counterclockwise. Transmission rod 42 drives bevel gear 43 to rotate in the second direction (counterclockwise) via gear component 52, thereby driving shuttle shaft 200 to rotate counterclockwise. Shuttle shaft 200 drives shuttle assembly to operate. Simultaneously, gear component 52 also drives bevel gear 62 to rotate in the first direction (clockwise). When the needle rotates, the linkage shaft 61 rotates in the forward direction accordingly, driving the synchronous pulley 631 to rotate synchronously. The synchronous pulley 631 drives the synchronous pulley 632 to rotate synchronously through the synchronous belt 633, thereby driving the bending needle shaft 100 to rotate clockwise. The bending needle shaft 100 can drive the bending needle assembly to run. Similarly, the motor 2 can also switch the main shaft 3 to rotate in the second direction. The main shaft 3 rotates counterclockwise. The power transmission is the same as the above process. The rotation direction of the shuttle shaft 200 is opposite to that of the bending needle shaft 100, so that the shuttle shaft 200 rotates clockwise and the bending needle shaft 100 rotates counterclockwise.

[0032] The specific work process of this plan is as follows: This technical solution achieves speed synchronization between the main shaft 3, the rotary shuttle shaft 200, and the needle loop shaft 100 via a two-stage transmission consisting of a bevel gear pair and a timing belt 633. The timing assembly 63 is separately installed on the rotary shuttle shaft 200 and the needle loop shaft 100 in the power transmission chain and connected by an independently installed linkage shaft 61 and its end bevel gear 62. This makes the timing assembly 63, consisting of the timing belt 633 and its associated timing pulleys 631 and 632, relatively external. Maintenance or replacement can be performed without disassembling the enclosed core components of the machine head, reducing the difficulty and time of later maintenance and improving maintenance efficiency.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.

Claims

1. A power transmission device for a foot-rolling machine, used to drive the bending needle shaft (100) and the rotary hook shaft (200) on the foot-rolling machine, the foot-rolling machine comprising a frame (1) and a motor (2) disposed on the frame (1), the motor (2) being provided with a main shaft (3), characterized in that, include: The first linkage (4) is disposed between the main shaft (3) and the shuttle shaft (200). The first linkage (4) includes a bevel gear (41) disposed on the main shaft (3), a transmission rod (42) and a bevel gear (43) disposed on the shuttle shaft (200). The two ends of the transmission rod (42) are respectively provided with a gear component (51) for meshing with the bevel gear (41) and a gear component (52) for meshing with the bevel gear (43). The second linkage (6) is disposed between the rotary shuttle shaft (200) and the bend needle shaft (100). The second linkage (6) includes a linkage shaft (61) disposed on the frame (1), a bevel gear three (62) disposed at the end of the linkage shaft (61), and a synchronization component (63). The synchronization component (63) includes a synchronization wheel one (631) disposed on the linkage shaft (61), a synchronization wheel two (632) disposed at the end of the bend needle shaft (100), and a synchronization belt (633) tensioned between the synchronization wheel one (631) and the synchronization wheel two (632). The bevel gear three (62) meshes with the gear component two (52).

2. The power transmission device for a foot winch according to claim 1, characterized in that: The gear ratio of the second synchronous pulley (632) to the first synchronous pulley (631) is 2, so that the rotational speed ratio of the first synchronous pulley (631) to the second synchronous pulley (632) is 2.

3. The power transmission device for a foot winch according to claim 1, characterized in that: The frame (1) has a cavity (7) below it, and the second linkage (6) is confined in the cavity (7). The cavity (7) is open at the bottom of the frame (1).

4. The power transmission device for a foot winch according to claim 3, characterized in that: The frame (1) has a mounting hole (8) that extends through the cavity (7) to the outside. The rear end of the linkage shaft (61) is provided with a bearing (9). The cross-sectional area of ​​the bearing (9) and the first synchronous pulley (631) are both adapted to be equal to the cross-sectional area of ​​the mounting hole (8), so that the linkage shaft (61) and the first synchronous pulley (631) can be installed into the cavity (7) through the mounting hole (8), and the bearing (9) is engaged in the mounting hole (8).

5. The power transmission device for a foot winch according to claim 4, characterized in that: The mounting hole (8) is connected to a mounting cover (10).

6. The power transmission device for a foot winch according to claim 4, characterized in that: The frame (1) is also provided with a limiting hole (11), which is aligned with the mounting hole (8). The linkage shaft (61) is fitted with a transmission sleeve (12), which is confined within the mounting hole (8). The linkage shaft (61) rotates along the inner side of the transmission sleeve (12).

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