Belt loop sewing method and belt loop sewing sewing machine

Abstract

The invention provides a band ring sewing machine, and the machine achieves the Z-shaped sewing of one end part of band ring and reduces the stitch number. The machine is provided with a sewing needle up / down movement mechanism; a band ring clamping board; a band ring pressing pin; a carrying table; a cloth pressing pin; a first moving mechanism which enables the band ring pressing pin and the carrying table to move; a second moving mechanism which enables cloth to move; a clamping board moving mechanism which enables the band ring clamping board to move; a control device; an insertion part; and an insertion part movement mechanism. The control device carries out the following control: folding stitch forming control: forming a folding stitch at one end part of the band ring clamped by the band ring clamping board; insertion part configuration control: configuring an insertion part in a gap between the cloth and the band ring between the folding stitch and a clamping position referred by the band ring clamping board; folding control: enabling the insertion part to move towards the folding stitch, and forming a state of band ring folding through the insertion part; folding sewing control: forming a stitch which enables the band ring to be sewed towards the stitch, so as to maintain the folding state of the band ring.

Description

technical field [0001] The present invention relates to a loop sewing method and a loop sewing sewing machine. Background technique [0002] The belt loop sewing machine is used to sew a belt loop through which a belt is passed to fabric such as trousers. The belt loop is a long and thin strip of cloth, and there are various sewing methods for sewing it to the cloth. As one of them, there is known a sewing method in which, as shown in FIG. 20(A), one end of the belt loop is folded back twice to form a Z-shape for sewing. [0003] A conventional belt loop sewing machine has: a belt loop clamp 31 for gripping the belt loop in a predetermined direction (set as the Y direction); a mounting table 51 for placing the material; 71, which presses and holds the cloth from above; the belt loop presser foot 52, which presses the belt loop B from above with the smaller frame through which the sewing needle passes; the slack part 66, which makes the belt loop B have slack; Motor, it ca...

AI Technical Summary

Problems solved by technology

[0022] Therefore, an increase in thread consumption during sewing of the belt loop B and a decrease in working efficiency due to an increase in sewing time occur.

[0023] In addition, since the belt loop B is dragged when turning back at the seam line L2, it becomes a cause of lifting or misalignment of the sewn part of the fabric C.

[0024] In addition, there is a problem that the stitches L1 to L3 are concentrated in the narrow portion on the back side of the cloth C, thereby degrading the appearance and deteriorating the commercial value.

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