Thread trimming/loosening foot-lifting/pressing device for sewing machine, and sewing machine

Abstract

The invention relates to the technical field of sewing machines, in particular to a thread trimming/loosening foot-lifting/pressing device for a sewing machine, and the sewing machine comprising the device. The device comprises a power member, a cam structure, a thread trimming driving crankshaft, and an ejector rod, wherein the cam structure rotates under the driving of the power member, and is provided with a first driving contour surface and a second driving contour surface; the thread trimming driving crankshaft is connected with a thread trimming mechanism, a first transmission pin is arranged on the thread trimming driving crankshaft and is matched with the first driving contour surface, and the first driving contour surface is provided with a thread trimming driving section for driving the thread trimming mechanism to execute a thread trimming operation; a second transmission pin is arranged at one end of the ejector rod, and the other end is connected with a thread loosening mechanism and a foot lifting/pressing mechanism, the second transmission pin is matched with the second driving contour surface, and the second driving contour surface is provided with a thread loosening driving section for driving the thread loosening mechanism to execute the thread loosening operation and a foot lifting/pressing driving section for driving the foot lifting/pressing mechanism to execute the operation of lifting/pressing the foot. And three functions of thread trimming, thread loosening and foot lifting/pressing are realized through one power member.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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AI Technical Summary

Benefits of technology

This new design allows for better control over threads during embroidery operations compared to previous designs that had issues such as excessive tension between yarns when trying to remove them after they have been stitched together. It also simplifies the overall structure while improving its performance and reliability.

Problems solved by technology

In this patented technology there exist technical solutions that involve controllers or motors in order to control various aspects related to these processes like thread cutting, thread lock releasing, pressing feet lift up, etc., but they have limitations due to their complexity and lacked precise workability.

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