Surface thread controller of sewing machine

Abstract

The invention relates to an upper thread holding device of a sewing machine, in particular to an upper thread holding device (70) of a button sewing machine (100), comprising a slablike sewing thread catching part (71) with the front end formed into a catching part (71b) catching a sewing thread (T) and moving forwards and backwards, a cylinder (72) fixed on a body frame (F) and ensures that the sewing thread catching part (71) moves forwards and backwards as well as a first leaf spring (73) in elastic connection with the underside (71a) of the sewing thread catching part (71), wherein the first leaf spring (73) applies elastic force on the underside (71a) of the sewing thread catching part (71); the sewing thread catching part (71) ensures that the sewing thread (T) is in slide contact with the surface of the first leaf spring (73) and moves from the front end part (73a) to the butt end part (73b) of the first leaf spring (73), thereby holding the sewing thread (T) caught by the catching part (71b) of the sewing thread catching part (71). The upper thread holding device can reduce the occurrence of sewn degraded product.

Description

technical field [0001] The present invention relates to a needle thread holding device for a sewing machine which holds the cut end of the needle thread passed through a machine needle. Background technique [0002] In conventional sewing machines, after forming a prescribed stitch, the needle is pulled out from the fabric, stopped at a prescribed position, and the upper thread connected to the needle and the fabric is cut off. The upper thread retaining device of a sewing machine at the severed end of the upper thread of the needle so that the upper thread does not come out of the needle when sewing to form the next stitch is started. [0003] In addition, as the above-mentioned needle thread holding device, a well-known structure is that the needle thread catcher slides along the guide groove of the guide frame to move forward and backward, and holds the slave needle so as to be sandwiched between the catcher body and the guide groove. The side of the end of the hanging u...

AI Technical Summary

Problems solved by technology

[0010] However, the upper thread secured by the thread removal device is pulled by the hook and consumed when the needle is raised. At this time, since the slack upper thread is pulled rapidly, the end of the upper thread held by the upper thread holding device is Bounced and let go, causing the end of the upper thread to lose control, the upper thread is drawn to the upstream side of the needle and falls out of the needle, or the upper thread is drawn to the upstream or downstream side of the needle, making the upper thread connected to the fabric The length of the end is not stable

[0011] If the length of the end of the upper thread is unstable, the upper and lower movement of the needle may cause the end of the upper thread to fall off the needle at the beginning of the next sewing, or lengthen the length of the end of the thread connected to the fabric, thereby reducing the sewing time. quality

And it is necessary to re-thread the dropped suture into the machine needle, or the operator manually aligns and cuts the thread end length when the thread end length is too long, thereby reducing production efficiency

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