Keyhole sartorius

Abstract

The invention enables the prevention of the stain of a drive mechanism due to the lint without having any bad influences upon a drive section or a sliding section of the drive mechanism by certainly collecting the lint generated by the thread cutting. A boxy lint collecting chamber is integrally formed at a front end section of a bed table and a forward slope type bridge board member is fixed to a front end of a bed frame. A lint collecting member disposed on a looper foundation is moved to the back by the turning of the looper foundation following the sewing of an eyelet hole darning seam and when the looper foundation is regressively turned to the original sewing commencement position after the tread cutting action by a thread cutting device, the lint collecting member is regressively turned at the same time and moves the lint which is generated by the cutting towards the lint collecting chamber so that the lint is automatically collected in the lint collecting chamber in the manner of sliding on the bridge board member.

Description

technical field [0001] The present invention relates to a buttonhole sewing machine, in particular to a buttonhole sewing machine with a thread recovery chamber for recovering thread ends generated when a thread cutting device attached to a feeding table moving on a bottom plate performs a thread cutting action. Background technique [0002] A buttonhole sewing machine for sewing round-end buttonhole stitches has a needle bar up and down movement mechanism, a needle swing mechanism, a looper driving mechanism and a thread take-up mechanism. In this keyhole sewing machine, the upper shaft is driven by the sewing machine motor to rotate, and the rotation of the upper shaft is transmitted to various mechanisms. With the action of the needle bar up and down movement mechanism and the needle swing mechanism, the needle bar is separated by a predetermined swing width. Alternately move up and down on the position of the looper, and at the same time, through the action of the looper...

AI Technical Summary

Problems solved by technology

In this way, there is a problem that the lubricating oil cannot be supplied sufficiently, and the driving part generates heat, which causes failure and wear.

Especially when a large number of thread ends are attached, there are also problems that hinder the operation of each drive mechanism, cause malfunction of the looper, or deteriorate the feeding accuracy of the feeding table, thereby hindering sewing.

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