Round-head keyhole sartorius

Abstract

The round head buttonhole sewing machine of the present invention comprises: a needle bar that moves up and down; a feeding device with a feeding table that fixes a pair of left and right cloth bearing plates that support the object to be sewn; A pair of needle plates; and a thread cutting device for cutting the suture extending from the sewing end position of the eyelet buttonhole stitch by using the upper knife and the lower knife, wherein the cloth carrying plate can be mounted and detached on the eyelet lock The various types of needle plates whose length in the front and rear direction increases stepwise every time the length of the tail portion of the eyeliner trace increases by a predetermined length, and the length in the front and rear direction of each needle plate of the various types is set and placed on the cloth carrier plate. Therefore, when viewed from above the cloth carrying plate, the sewing end position of the eyelet buttonhole stitch is relatively in a certain position relative to the thread cutting device.

Description

technical field [0001] The invention relates to a buttonhole sewing machine for sewing buttonhole stitches composed of a round head and a tail, in particular to a buttonhole sewing machine capable of sewing buttonhole stitches of different lengths. Background technique [0002] The eyelet buttonhole sewing machine has a needle bar, a looper, a feeding table that supports the object to be sewn for eyelet buttonhole sewing, and a thread trimmer provided inside the feeding table. The thread cutting device cuts off the bobbin thread and core thread at the same time when the buttonhole sewing ends. [0003] In Japanese Laid-Open Patent Publication No. 2001-321589 (Prior Art Document 1), a buttonhole sewing machine having a thread cutting device is described. On the right side cloth bearing plate on the right side of the center line of the round head keyhole stitch (the stitch formed by the round head and the tail extending linearly from the round head), the upper cloth is rotata...

AI Technical Summary

Problems solved by technology

However, in the upper knife replacement operation, it is necessary to remove the cloth bearing plate on the right side and then remove the step screw to disconnect the connecting rod, which requires a lot of work time and labor.

Therefore, it is not easy to replace the upper knife, and it is necessary to prepare a variety of upper knives according to the type of needle plate.

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