Electric drive for a sewing machine

Abstract

The application relates to an electric driving device of a sewing machine, which comprises a driving mechanism, a thread cutting mechanism, a thread loosening mechanism and a presser foot lifting mechanism. The driving mechanism comprises a motor and a cam. The thread cutting mechanism comprises a thread cutting transmission assembly and a thread cutting module, and the thread cutting transmission assembly is connected with the cam. The thread loosening mechanism comprises a thread loosening transmission assembly and a thread loosening module, and one end of the thread loosening transmission assembly is arranged in correspondence with the cam. The presser foot lifting mechanism comprises a presser foot transmission assembly and a presser foot module, and one end of the presser foot transmission assembly is arranged in correspondence with the cam. When the motor drives the cam to rotate, the thread cutting transmission assembly is driven to make the thread cutting module cut the thread, the thread loosening transmission assembly is driven to make the thread loosening module loosen the thread, and the presser foot transmission assembly is driven to make the presser foot module lift. Therefore, the structure can be simplified and the volume is compact.

Description

Technical Field

[0001] This application relates to the technical field of a sewing machine, and more particularly to an electric 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. The thread cutting mechanism, the thread loosening mechanism, and the presser foot lifting mechanism are each equipped with a driver. One driver drives the thread cutting mechanism to perform a thread cutting action, another driver drives the thread loosening mechanism to perform a thread loosening action, and yet another driver 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 rely on multiple drives to power each component individually. This results in not only material and manufacturing costs for each component, but also considerable complexity and cumbersome installation, and an excessively large overall size.

[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 an electric drive device for a sewing machine that not only simplifies the overall transmission structure but also has a more compact size.

[0006] To achieve the above objectives, this application provides an electric drive device for a sewing machine. The sewing machine has a body, and the electric drive device includes a drive mechanism, a thread cutting mechanism, a thread loosening mechanism, and a presser foot lifting mechanism. The drive mechanism is fixed to the body and includes an electric motor and a cam driven by the electric motor. The thread cutting mechanism includes a thread cutting transmission assembly and a thread cutting module actuated by the thread cutting transmission assembly. One end of the thread cutting transmission assembly is connected to and driven by the cam. The thread loosening mechanism includes a thread loosening transmission assembly and a thread loosening module actuated by the thread loosening transmission assembly. One end of the thread loosening transmission assembly is configured corresponding to the cam and driven by it. The presser foot lifting mechanism includes a presser foot transmission assembly and a presser foot module actuated by the presser foot transmission assembly. One end of the presser foot transmission assembly is configured corresponding to the cam and driven by it. When the electric motor drives the cam to rotate, it drives the thread cutting transmission assembly to cause the thread cutting module to cut the thread, drives the thread loosening transmission assembly to cause the thread loosening module to loosen the thread, and drives the presser foot transmission assembly to cause the presser foot module to lift.

[0007] In one embodiment, the cam includes a guide groove, and the end of the tangential drive assembly is embedded in the guide groove and driven by the cam.

[0008] In one embodiment, the tangential drive assembly includes a first link, a second link, and a connector. The first link is pivotally connected to the machine body and is embedded in a guide groove via a roller. One end of the second link is connected to the end of the first link away from the roller. The connector is connected to the end of the second link away from the first link. The tangential module is connected to the connector.

[0009] In one embodiment, the cam includes a first raised profile that operably actuates a loose wire drive assembly.

[0010] In one embodiment, the wire release drive assembly includes a shaft, a rocker arm, and a lever. One end of the shaft is actuated by a first raised profile. The two ends of the rocker arm are respectively connected to the shaft and the lever. The end of the lever away from the rocker arm is connected to the wire release module.

[0011] In one embodiment, the cam includes a second raised profile that operably actuates the presser foot drive assembly.

[0012] In one embodiment, the presser foot transmission assembly includes a driven bearing, a first swing arm, a rotating shaft, and a second swing arm. The driven bearing is connected to the first swing arm and is actuated by a second raised profile. 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.

[0013] In one embodiment, a puller lifting mechanism is also included, which is connected to and driven by the presser foot drive assembly.

[0014] In one embodiment, the cam includes a guide groove, a first raised profile, and a second raised profile. One end of the tangential drive assembly is embedded in the guide groove and driven by the cam. The first raised profile operably actuates the wire release drive assembly, and the second raised profile operably actuates the pressure foot drive assembly.

[0015] In one embodiment, a puller lifting mechanism is also included, which is connected to and driven by the presser foot drive assembly.

[0016] This application also has the following advantages: by integrating the drive mechanism, the operating and maintenance costs of each drive can be significantly reduced. Attached Figure Description

[0017] Figure 1 This is an external view of the electric drive unit assembly of the sewing machine of this application.

[0018] Figure 2 This is another perspective view of the electric drive unit of the sewing machine of this application.

[0019] Figure 3 This is a schematic diagram of the combination of the drive mechanism, tangential drive assembly, wire release drive assembly and pressure foot drive assembly of this application.

[0020] Figure 4 This is an exploded view of the drive mechanism, tangential drive assembly, wire release drive assembly, and pressure foot drive assembly of this application.

[0021] Figure 5 This is a schematic diagram illustrating the operation of the tangent module and loosening module of this application.

[0022] Figure 6 Another perspective view of the tangent module and loose module of this application during operation.

[0023] Figure 7 This is a schematic diagram of the tangent module and loosening module during the recovery process of this application.

[0024] Figure 8 This is another perspective view of the tangent and loose line modules during the reversion process in this application.

[0025] Figure 9 This is a schematic diagram of the presser foot module and pull wheel lifting mechanism of this application before they are activated.

[0026] Figure 10 This is a schematic diagram showing the presser foot module and pull wheel lifting mechanism of this application after they are activated.

[0027] Explanation of reference numerals in the attached figures:

[0028] 10: Drive mechanism;

[0029] 11: Electric motor;

[0030] 12: Drive cam;

[0031] 121: Guide groove;

[0032] 122: First raised contour;

[0033] 123: Second raised contour;

[0034] 20: Tangent mechanism;

[0035] 21: Tangential drive assembly;

[0036] 211: First link;

[0037] 212: Second link;

[0038] 213: Connector;

[0039] 214: Roller;

[0040] 22: Tangent module;

[0041] 30: Thread loosening mechanism;

[0042] 31: Loose wire drive assembly;

[0043] 311: Shaft;

[0044] 312: Rocker arm;

[0045] 313: Lever;

[0046] 32: Loose wire module;

[0047] 40: Presser foot lifting mechanism;

[0048] 41: Presser foot transmission assembly;

[0049] 410: Driven bearing;

[0050] 411: First swing arm;

[0051] 412: Shaft;

[0052] 413: Second swing arm;

[0053] 42: Presser foot module;

[0054] 50: Pull-wheel lifting mechanism;

[0055] 8: Sewing machine;

[0056] 81: Body. Detailed Implementation

[0057] 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.

[0058] Please see Figures 1 to 4 As shown, this application provides an electric drive device for a sewing machine, wherein the sewing machine 8 has a body 81, and the electric drive device mainly includes a drive mechanism 10, a thread cutting mechanism 20, a thread loosening mechanism 30, and a presser foot lifting mechanism 40.

[0059] The drive mechanism 10 is fixed to the body 81 and mainly includes an electric motor 11 and a cam 12. The electric motor 11 is a stepper motor, which is fixed to the body 81 by screws and other locking components and is hidden in the internal space of the body 81. The cam 12 is connected to the side of the electric motor 11 and is driven by the electric motor 11. In this embodiment, the cam 12 mainly includes a guide groove 121, a first raised profile 122 and a second raised profile 123.

[0060] The tangent mechanism 20 mainly includes a tangent transmission assembly 21 and a tangent module 22. The tangent transmission assembly 21 mainly includes a first connecting rod 211, a second connecting rod 212, and a connector 213. One end of the first connecting rod 211 is embedded in the guide groove 121 of the aforementioned cam 12 via a roller 214. The middle section of the first connecting rod 211 is pivotally connected to the aforementioned body 81. One end of the second connecting rod 212 is connected to the end of the first connecting rod 211 away from the roller 214. The connector 213 is connected to the end of the second connecting rod 212 away from the first connecting rod 211. The tangent module 22 is connected to and actuated by the connector 213. The tangent module 22 is mounted on the platform of the body 81. Since it belongs to the prior art, it will not be described in detail.

[0061] 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 shaft 311, a rocker arm 312, and a lever 313. The shaft 311 is configured corresponding to the first raised profile 122 of the aforementioned cam 12. The first raised profile 122 operably actuates the shaft 311. The two ends of the rocker arm 312 are respectively connected to the shaft 311 and the lever 313. The lever 313 is pivotally connected to the aforementioned body 81, and its end away from the rocker arm 312 is connected to the wire loosening module 32. The wire loosening module 32 is fixed on the aforementioned body 81 and is actuated by the lever 313. Since the wire loosening module 32 belongs to the prior art, it will not be described in detail.

[0062] The presser foot lifting mechanism 40 mainly includes a presser foot transmission assembly 41 and a presser foot module 42. The presser foot transmission assembly 41 mainly includes a driven bearing 410, a first swing arm 411, a rotating shaft 412, and a second swing arm 413. The driven bearing 410 is connected to one end of the first swing arm 411 and is configured corresponding to the second raised profile 123 of the aforementioned cam 12. The second raised profile 123 operably actuates the driven bearing 410. The rotating shaft 412 is pivotally connected to the aforementioned body 81, and its two ends are respectively connected to the first swing arm 411 and the second swing arm 413. The second swing arm 413 is connected to the presser foot module 42. The presser foot module 42 is erected on the aforementioned body 81 and is actuated by the second swing arm 413. Since the presser foot module 42 belongs to the prior art, it will not be described in detail.

[0063] The electric drive device of the sewing machine of this application further includes a pull wheel lifting mechanism 50, which is connected to and driven by the aforementioned presser foot transmission assembly 41; specifically, the pull wheel lifting mechanism 50 is connected to and driven by the second swing arm 413.

[0064] Please see Figures 5 to 8As shown, in use, when the motor 11 drives the cam 12 to rotate, the cam 12 drives the first link 211 of the tangent transmission assembly 21 to swing through its guide groove 121. This swinging motion drives the second link 212 and the connector 213 to move horizontally. The connector 213 then drives the movable blade of the tangent module 22 to cut relative to the fixed blade. Figure 5 The moving blade is used to make a cutting motion. Figure 7 This is the action of the movable blade retracting. Simultaneously, the first raised profile 122 of the cam 12 drives the shaft 311 of the wire loosening transmission assembly 31 to rotate horizontally, thereby causing the rocker arm 312 to swing, and simultaneously causing the lever 313 to rotate. The rotation of the lever 313 causes the wire loosening module 32 to loosen the wire. Figure 6 This refers to the state when the loose wire module 32 is activated. Figure 8 This indicates the state when the loose wire module 32 is not activated.

[0065] Please see Figure 9 and Figure 10 As shown, when the motor 11 drives the second convex profile 123 of the cam 12 to rotate, the second convex profile 123 will push the driven bearing 410, causing the first swing arm 411 to rotate and swing, which in turn drives the rotating shaft 412 to rotate. The rotation of the rotating shaft 412 drives the second swing arm 413 to rotate and swing, thereby causing the presser foot module 42 to lift. Figure 9 This is the state when the pressure foot module 42 is not raised. Figure 10 This is the state after the presser foot module 42 is raised. Simultaneously, the pull wheel lifting mechanism 50 is connected to the presser foot transmission assembly 41, and the second swing arm 413 rotates and swings, causing the pull wheel lifting mechanism 50 to lift. Figure 9 This represents the state when the lifting mechanism 50 is not lifted. Figure 10 This is the state after the pull-wheel lifting mechanism has lifted the wheel by 50.

[0066] 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. An electric drive device for a sewing machine, characterized in that, The sewing machine has a body, and the electric drive device includes: A drive mechanism is fixed to the machine body, and the drive mechanism includes an electric motor and a cam driven by the electric motor; A tangent mechanism includes a tangent drive assembly and a tangent module actuated by the tangent drive assembly, one end of which is connected to and driven by the cam. A wire release mechanism includes a wire release drive assembly and a wire release module actuated by the wire release drive assembly, one end of the wire release drive assembly being configured corresponding to and driven by the cam; and The presser foot lifting mechanism includes a presser foot transmission assembly and a presser foot module actuated by the presser foot transmission assembly, wherein one end of the presser foot transmission assembly is configured corresponding to and driven by the cam; When the motor drives the cam to rotate, it will drive the tangent transmission assembly to cause the tangent module to tangent, drive the loosening transmission assembly to cause the loosening module to loosen the wire, and drive the presser foot transmission assembly to cause the presser foot module to lift.

2. The electric drive device for a sewing machine as described in claim 1, characterized in that, The cam includes a guide groove, and the end of the tangential drive assembly is embedded in the guide groove and driven by the cam.

3. The electric drive device for a sewing machine as described in claim 2, characterized in that, The tangential transmission assembly includes a first connecting rod, a second connecting rod, and a connector. The first connecting rod is pivotally connected to the machine body and embedded in the guide groove through a roller. One end of the second connecting rod is connected to the end of the first connecting rod away from the roller. The connector is connected to the end of the second connecting rod away from the first connecting rod. The tangential module is connected to the connector.

4. The electric drive device for a sewing machine as described in claim 1, characterized in that, The cam includes a first raised profile that operably actuates the loose wire drive assembly.

5. The electric drive device for a sewing machine as described in claim 4, characterized in that, The wire loosening transmission assembly includes a shaft, a rocker arm, and a lever. One end of the shaft is actuated by the first raised profile. The two ends of the rocker arm are respectively connected to the shaft and the lever. The end of the lever away from the rocker arm is connected to the wire loosening module.

6. The electric drive device for a sewing machine as described in claim 1, characterized in that, The cam includes a second raised profile that operably actuates the presser foot drive assembly.

7. The electric drive device for a sewing machine as described in claim 6, characterized in that, The presser foot transmission assembly includes a driven bearing, a first swing arm, a rotating shaft, and a second swing arm. The driven bearing is connected to the first swing arm and is actuated by the second raised profile. 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.

8. The electric 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.

9. The electric drive device for a sewing machine as described in claim 1, characterized in that, The cam includes a guide groove, a first raised profile, and a second raised profile. One end of the tangential drive assembly is embedded in the guide groove and driven by the cam. The first raised profile can operably actuate the wire release drive assembly, and the second raised profile can operably actuate the pressure foot drive assembly.

10. The electric drive device for a sewing machine as described in claim 9, characterized in that, It also includes a pull-wheel lifting mechanism, which is connected to and driven by the presser foot drive assembly.

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