pneumatic drive unit of sewing machine

Abstract

This application relates to a pneumatic drive device for a sewing machine, including a first pneumatic cylinder, a thread cutting mechanism, a thread loosening mechanism, a second pneumatic cylinder, and a presser foot lifting mechanism. The first pneumatic cylinder is fixed to the machine body. The thread cutting mechanism includes a thread cutting module connected to and driven by the first pneumatic cylinder. The thread loosening mechanism includes a thread loosening transmission assembly and a thread loosening module actuated by the thread loosening transmission assembly. The thread loosening transmission assembly is connected to and driven by the first pneumatic cylinder. The second pneumatic cylinder is fixed to the machine body. The presser foot lifting mechanism includes a presser foot transmission assembly and a presser foot module actuated by the presser foot transmission assembly. The presser foot transmission assembly includes a first swing arm, and the second pneumatic cylinder directly drives the first swing arm. The first pneumatic cylinder drives the thread cutting module to cut the thread and drives the thread loosening transmission assembly to loosen the thread. The second pneumatic cylinder drives the presser foot transmission assembly to lift the presser foot module. This simplifies the overall structure and makes the device more compact.

Description

Technical Field

[0001] This application relates to the technical field of a sewing machine, and more particularly to a pneumatic drive device for a sewing machine. Background Technology

[0002] Existing sewing machines mainly include a machine body, a power mechanism, a thread cutting mechanism, a thread loosening mechanism, and a presser foot lifting mechanism. Each of the thread cutting mechanism, the thread loosening mechanism, and the presser foot lifting mechanism is equipped with an actuator. One actuator drives the thread cutting mechanism to perform a thread cutting action, another actuator drives the thread loosening mechanism to perform a thread loosening action, and yet another actuator drives the presser foot lifting mechanism to perform a presser foot lifting action.

[0003] However, although existing sewing machines have the aforementioned functions such as thread cutting, thread loosening, and presser foot lifting, they achieve their functions by actuating each component individually with multiple actuators. This not only results in material and manufacturing costs for each component, but also in terms of complex and cumbersome installation, and the combined size is also too large.

[0004] In view of this, the applicant has devoted himself to researching and applying theoretical principles to address the shortcomings of the prior art, and has made every effort to solve the aforementioned problems, which has become the target of the applicant's improvement. Utility Model Content

[0005] The purpose of this application is to provide a pneumatic drive device for a sewing machine, which not only simplifies the overall transmission structure but also makes the overall size more compact.

[0006] To achieve the above objectives, this application provides a pneumatic drive device for a sewing machine. The sewing machine has a body, and the pneumatic drive device includes a first air cylinder, a thread cutting mechanism, a thread loosening mechanism, a second air cylinder, and a presser foot lifting mechanism. The first air cylinder is fixed to the body. The thread cutting mechanism includes a thread cutting module connected to and driven by the first air cylinder. The thread loosening mechanism includes a thread loosening transmission assembly and a thread loosening module actuated by the thread loosening transmission assembly. The thread loosening transmission assembly is connected to and driven by the first air cylinder. The second air cylinder is fixed to the body. The presser foot lifting mechanism includes a presser foot transmission assembly and a presser foot module actuated by the presser foot transmission assembly. The presser foot transmission assembly includes a first swing arm, and the second air cylinder directly drives the first swing arm. The first air cylinder drives the thread cutting module to cut the thread and drives the thread loosening transmission assembly to loosen the thread. The second air cylinder drives the presser foot transmission assembly to lift the presser foot module.

[0007] In one embodiment, the first pneumatic cylinder includes a first push rod, and the tangent mechanism further includes an adapter, through which the tangent module is connected to the first push rod.

[0008] In one embodiment, the wire release drive assembly includes a connecting rod assembly, a shaft, a rocker arm, and a crankshaft. The two ends of the connecting rod assembly are respectively connected to a first push rod and a shaft. The shaft is actuated by the connecting rod assembly. The two ends of the rocker arm are respectively connected to the shaft and the crankshaft. The crankshaft is pivotally connected to the machine body, and a wire release module is connected to the end of the crankshaft away from the rocker arm.

[0009] In one embodiment, the second pneumatic cylinder includes a second push rod, and the presser foot transmission assembly further includes a rotating shaft and a second swing arm. One end of the first swing arm is connected to the second push rod, the rotating shaft is pivotally connected to the machine body, and the two ends of the rotating shaft are respectively connected to the first swing arm and the second swing arm. The second swing arm is connected to the presser foot module.

[0010] In one embodiment, a puller lifting mechanism is also included, which is connected to and driven by the presser foot drive assembly.

[0011] In one embodiment, the first pneumatic cylinder includes a first push rod, and the tangent mechanism further includes an adapter, through which the tangent module is connected to the first push rod.

[0012] In one embodiment, the wire release drive assembly includes a connecting rod assembly, a shaft, a rocker arm, and a crankshaft. The two ends of the connecting rod assembly are respectively connected to a first push rod and a shaft. The shaft is actuated by the connecting rod assembly. The two ends of the rocker arm are respectively connected to the shaft and the crankshaft. The crankshaft is pivotally connected to the machine body, and a wire release module is connected to the end of the crankshaft away from the rocker arm.

[0013] In one embodiment, the second pneumatic cylinder includes a second push rod, and the presser foot transmission assembly also includes a rotating shaft and a second swing arm. One end of the first swing arm is connected to the second push rod, the rotating shaft is pivotally connected to the machine body, and the two ends of the rotating shaft are respectively connected to the first swing arm and the second swing arm. The second swing arm is connected to the presser foot module and the pull wheel lifting mechanism.

[0014] This application also has the following advantages: it can significantly reduce the usage and maintenance costs of each actuator. By directly driving the first swing arm using the second pneumatic cylinder, the transmission and configuration of multiple lever mechanisms in the prior art can be eliminated. Attached Figure Description

[0015] Figure 1 This is an external view of the pneumatic drive unit assembly of the sewing machine of this application.

[0016] Figure 2 This is another perspective view of the pneumatic drive device of the sewing machine of this application.

[0017] Figure 3 This is a schematic diagram of the combination of the first pneumatic cylinder, the wire cutting mechanism, and the wire loosening mechanism of this application.

[0018] Figure 4 This is a schematic diagram of the first pneumatic cylinder, the tangent mechanism, and the unwinding mechanism from another perspective.

[0019] Figure 5 This is a schematic diagram of the combination of the second pneumatic cylinder, the presser foot lifting mechanism, and the pull wheel lifting mechanism of this application.

[0020] Figure 6 This is a schematic diagram of the second pneumatic cylinder, the presser foot lifting mechanism, and the pull wheel lifting mechanism from another perspective.

[0021] Figure 7 This is a schematic diagram showing the operation of the tangent module and loosening module of this application.

[0022] Figure 8 This is a schematic diagram showing the presser foot module and pull wheel lifting mechanism of this application after they are activated.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10: First pneumatic cylinder;

[0025] 11: First cylinder block;

[0026] 12: First putter;

[0027] 20: Tangent mechanism;

[0028] 21: Tangent module;

[0029] 22: Adapter;

[0030] 30: Thread loosening mechanism;

[0031] 31: Loose wire drive assembly;

[0032] 311: Linkage assembly;

[0033] 312: Shaft;

[0034] 313: Rocker arm;

[0035] 314: Crankshaft;

[0036] 32: Loose wire module;

[0037] 40: Second pneumatic cylinder;

[0038] 41: Second cylinder block;

[0039] 42: Second putter;

[0040] 50: Presser foot lifting mechanism;

[0041] 51: Presser foot transmission assembly;

[0042] 511: First swing arm;

[0043] 512: Shaft;

[0044] 513: Second swing arm;

[0045] 52: Presser foot module;

[0046] 60: Pull-wheel lifting mechanism;

[0047] 8: Sewing machine;

[0048] 81: Body. Detailed Implementation

[0049] The detailed description and technical content of this application are explained below with reference to the accompanying drawings. However, the accompanying drawings are provided for reference and illustration only and are not intended to limit this application.

[0050] Please see Figures 1 to 6 As shown, this application provides a pneumatic drive device for a sewing machine, wherein the sewing machine 8 has a body 81, and the pneumatic drive device mainly includes a first air cylinder 10, a thread cutting mechanism 20, a thread loosening mechanism 30, a second air cylinder 40, and a presser foot lifting mechanism 50.

[0051] Please refer to the following first. Figures 1 to 3 As shown, the first pneumatic cylinder 10 is fixed to the machine body 81, and it mainly includes a first cylinder body 11 and a first push rod 12. The first cylinder body 11 is fixed to the machine body 81 by screws and other locking components, and the first push rod 12 is connected to the first cylinder body 11 and can move relative to it.

[0052] The tangent mechanism 20 mainly includes a tangent module 21, which is connected to and actuated by the first push rod 12. The tangent module 21 is mounted on the platform of the body 81. In this embodiment, the tangent module 21 is connected to the first push rod 12 via an adapter 22, thereby allowing more degrees of freedom in both directions between the first push rod 12 and the tangent module 21. Since the tangent module 21 is prior art, it will not be described in detail.

[0053] The wire loosening mechanism 30 mainly includes a wire loosening transmission assembly 31 and a wire loosening module 32. The wire loosening transmission assembly 31 mainly includes a connecting rod assembly 311, a shaft 312, a rocker arm 313, and a crankshaft 314. The two ends of the connecting rod assembly 311 are respectively connected to the aforementioned first push rod 12 and the shaft 312. The shaft 312 is actuated by the connecting rod assembly 311. The two ends of the rocker arm 313 are respectively connected to the shaft 312 and the crankshaft 314. The crankshaft 314 is pivotally connected to the aforementioned body 81, and its end away from the rocker arm 313 is connected to the wire loosening module 32. The wire loosening module 32 is fixed to the aforementioned body 81 and is actuated by the crankshaft 314. Since the wire loosening module 32 belongs to the prior art, it will not be described in detail.

[0054] See also Figures 4 to 6As shown, the second pneumatic cylinder 40 is fixed to the machine body 81, and it mainly includes a second cylinder body 41 and a second push rod 42. The second cylinder body 41 is fixed to the machine body 81 by screws and other locking components, and the second push rod 42 is connected to the second cylinder body 41 and can move relative to it.

[0055] The presser foot lifting mechanism 50 mainly includes a presser foot transmission assembly 51 and a presser foot module 52. The presser foot transmission assembly 51 mainly includes a first swing arm 511, a rotating shaft 512, and a second swing arm 513. The second pneumatic cylinder 40 directly drives the first swing arm 511, and one end of the first swing arm 511 is connected to the aforementioned second push rod 42. The rotating shaft 512 is pivotally connected to the aforementioned body 81, and its two ends are respectively connected to the first swing arm 511 and the second swing arm 513. The second swing arm 513 is connected to the presser foot module 52. The presser foot module 52 is erected on the aforementioned body 81 and is actuated by the second swing arm 513. Since the presser foot module 52 is prior art, it will not be described in detail.

[0056] The pneumatic drive device for the sewing machine of this application further includes a pull wheel lifting mechanism 60, which is connected to and driven by the aforementioned presser foot transmission assembly 51; specifically, the pull wheel lifting mechanism 60 is connected to and driven by the second swing arm 513.

[0057] Please see Figure 7 As shown, during use, when the first push rod 12 of the first pneumatic cylinder 10 drives the adapter 22, it will drive the movable blade of the tangent module 21 to tangent relative to the fixed blade; at the same time, the movement of the first push rod 12 will drive the connecting rod assembly 311 of the loosening transmission assembly 31 to move horizontally, thereby causing the shaft 312 to swing, and at the same time driving the joystick 313 to rotate, and driving the crankshaft 314 to rotate, causing the loosening module 32 to loosen the wire.

[0058] See also Figure 8 As shown, when the second push rod 42 of the second pneumatic cylinder 40 drives the first swing arm 511 to swing, it drives the rotating shaft 512 to rotate. The rotation of the rotating shaft 512 drives the second swing arm 513 to swing, thereby causing the presser foot module 52 to lift. At the same time, the presser foot transmission assembly 51 is connected through the pull wheel lifting mechanism 60, and the pull wheel lifting mechanism 60 is lifted by the second swing arm 513.

[0059] The above description is only a preferred embodiment of this application and is not intended to limit the patent scope of this application. Other equivalent changes that utilize the patent spirit of this application should all fall within the patent scope of this application.

Claims

1. A pneumatic drive for a sewing machine, characterized in that The sewing machine has a body, and the pneumatic drive device includes: The first pneumatic cylinder is fixed to the machine body; A tangent mechanism, including a tangent module, wherein the tangent module is connected to and driven by the first pneumatic cylinder; A wire loosening mechanism includes a wire loosening drive assembly and a wire loosening module actuated by the wire loosening drive assembly, wherein the wire loosening drive assembly is connected to and driven by the first pneumatic cylinder. The second pneumatic cylinder is fixed to the machine body; and The presser foot lifting mechanism includes a presser foot transmission assembly and a presser foot module actuated by the presser foot transmission assembly. The presser foot transmission assembly includes a first swing arm, and a second pneumatic cylinder directly drives the first swing arm. The first pneumatic cylinder drives the tangent module to tangent and the loosening transmission assembly to loosen the wire, while the second pneumatic cylinder drives the presser foot transmission assembly to lift the presser foot module.

2. The pneumatic drive device for a sewing machine as described in claim 1, characterized in that, The first pneumatic cylinder includes a first push rod, and the tangent mechanism further includes an adapter, through which the tangent module is connected to the first push rod.

3. The pneumatic drive device for a sewing machine as described in claim 2, characterized in that, The wire loosening transmission assembly includes a connecting rod assembly, a shaft, a rocker arm, and a crankshaft. The two ends of the connecting rod assembly are respectively connected to the first push rod and the shaft. The shaft is actuated by the connecting rod assembly. The two ends of the rocker arm are respectively connected to the shaft and the crankshaft. The crankshaft is pivotally connected to the machine body, and the wire loosening module is connected to the end of the crankshaft away from the rocker arm.

4. The pneumatic drive device for a sewing machine as described in claim 3, characterized in that, The second pneumatic cylinder includes a second push rod, and the presser foot transmission assembly also includes a rotating shaft and a second swing arm. One end of the first swing arm is connected to the second push rod, the rotating shaft is pivotally connected to the machine body, and the two ends of the rotating shaft are respectively connected to the first swing arm and the second swing arm. The second swing arm is connected to the presser foot module.

5. The pneumatic drive device for a sewing machine as described in claim 1, characterized in that, It also includes a pull-wheel lifting mechanism, which is connected to and driven by the presser foot drive assembly.

6. The pneumatic drive device for a sewing machine as described in claim 5, characterized in that, The first pneumatic cylinder includes a first push rod, and the tangent mechanism further includes an adapter, through which the tangent module is connected to the first push rod.

7. The pneumatic drive device for a sewing machine as described in claim 6, characterized in that, The wire loosening transmission assembly includes a connecting rod assembly, a shaft, a rocker arm, and a crankshaft. The two ends of the connecting rod assembly are respectively connected to the first push rod and the shaft. The shaft is actuated by the connecting rod assembly. The two ends of the rocker arm are respectively connected to the shaft and the crankshaft. The crankshaft is pivotally connected to the machine body, and the wire loosening module is connected to the end of the crankshaft away from the rocker arm.

8. The pneumatic drive device for a sewing machine as described in claim 7, characterized in that, The second pneumatic cylinder includes a second push rod, and the presser foot transmission assembly also includes a rotating shaft and a second swing arm. One end of the first swing arm is connected to the second push rod, the rotating shaft is pivotally connected to the machine body, and the two ends of the rotating shaft are respectively connected to the first swing arm and the second swing arm. The second swing arm is connected to the presser foot module and the pull wheel lifting mechanism.

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