Electric drive device of sewing machine

Abstract

An electric drive device for a sewing machine includes a drive mechanism, a thread cutting mechanism, a thread loosening mechanism, and a presser foot lifting mechanism. The drive mechanism includes a motor and a cam. The thread cutting mechanism includes a thread cutting transmission assembly and a thread cutting module, with the thread cutting transmission assembly connected to the cam. The thread loosening mechanism includes a thread loosening transmission assembly and a thread loosening module, with one end of the thread loosening transmission assembly corresponding to the cam. The presser foot lifting mechanism includes a presser foot transmission assembly and a presser foot module, with one end of the presser foot transmission assembly corresponding to the cam. When the 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. This simplifies the structure and makes the device more compact.

Claims

1. An electric drive device for a sewing machine, the sewing machine having a body, the electric drive device comprising: A drive mechanism, fixed to the machine body, includes an electric motor and a cam driven by the electric motor; a tangential cutting mechanism, including a tangential cutting drive assembly and a tangential cutting module actuated by the tangential cutting drive assembly, one end of the tangential cutting drive assembly being connected to and driven by the cam; a wire release mechanism, including 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 disposed opposite to and driven by the cam; and a presser foot lifting mechanism, including a presser foot drive assembly and a presser foot module actuated by the presser foot drive assembly, one end of the presser foot drive assembly being disposed opposite to and driven by the cam; wherein when the electric motor drives the cam to rotate, it will drive the tangential cutting drive assembly to cause the tangential cutting module to cut wire, drive the wire release drive assembly to cause the wire release module to release wire, and drive the presser foot drive assembly to cause the presser foot module to lift.

2. The electric drive device of the sewing machine as claimed in claim 1, wherein the cam includes a guide groove, and one 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, wherein the tangential drive assembly includes a first link, a second link, and a connector, the first link being pivotally connected to the machine body and embedded in the guide groove through a roller, one end of the second link being connected to the end of the first link away from the roller, the connector being connected to the end of the second link away from the first link, and the tangential module being connected to the connector.

4. The electric drive of the sewing machine as claimed in claim 1, wherein the cam includes a first raised profile that is operably actuates the loosening drive assembly.

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

6. The electric drive of the sewing machine as claimed in claim 1, wherein the cam includes a second raised profile that is operably actuates the presser foot drive assembly.

7. The electric drive device for a sewing machine as described in claim 6, wherein the presser foot transmission assembly includes a driven bearing, a first swing arm, a rotating shaft and a second swing arm, the driven bearing being connected to the first swing arm and actuated by the second raised profile, the two ends of the rotating shaft being connected to the first swing arm and the second swing arm respectively, and the second swing arm being connected to the presser foot module.

8. The electric drive unit of the sewing machine as claimed in claim 1, further comprising a pulley lifting mechanism connected to and driven by the presser foot drive assembly.

9. An electric drive device for a sewing machine as claimed in claim 1, wherein 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 is operably actuating the thread release drive assembly, and the second raised profile is operably actuating the presser foot drive assembly.

10. The electric drive unit of the sewing machine as claimed in claim 9, further comprising a pulley lifting mechanism connected to and driven by the presser foot drive assembly.

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