Buttonhole machine and its method of forming eyelet stitch

Abstract

A complement holed stitches fabrication is carried out after forming a zigzag stitches 85 extending over both sides of the button hole 80 under the condition that a button hole 80 and defective holed stitches 70a are formed with a basting for stitching. Then the portions of the zigzag stitches 85 extending across the hole 80 are cut. A linking seam 187, a reinforcing seam 186, a linking seam 188, and a reinforcing seam 185 are continuously sewn in this order in holing seam planned parts 71a-74a and then a holed stitches is continuously sewn with a zigzag basting. With rectangular basting, befor sewing the holed stitches, a plurality of linear reinforcing stitches 285a-285c, 287a-287c and a plurality of cross stitches 286a-286c, 288a-288c are formed continuously on a plurality of circles in a loop-shape.

Description

Technical field [0001] The invention relates to a buttonhole machine and a method for forming buttonhole stitches. Background technique [0002] The traditional buttonhole machine has a cloth feeding device, a sewing device and a control device. The cloth feeding device is used to transport the processed cloth, the sewing device is used to form stitches on the processed cloth, and the control device controls the cloth feeding device and the sewing device. The buttonhole stitches formed have a pair of zigzag stitches and a pair of lock stitches. In addition, a buttonhole making device with a cutter for forming buttonholes on the processed cloth is also provided. The buttonhole making device is controlled by the control device, and the buttonhole stitch can be made inside the buttonhole stitch by a series of actions. Form button holes. [0003] The aforementioned sewing device generally includes a needle bar, a needle, a needle bar up-and-down driving dev...

AI Technical Summary

Problems solved by technology

[0013] In this way, when buttonholes are made by the buttonhole making device in the state where incomplete buttonhole stitches have been formed on the processed cloth, once the buttonhole stitches are supplemented without any preparation on the processed cloth, it is especially difficult. When zigzag stitches are used to form keyhole stitches on both sides of the buttonhole, the processed cloth tends to protrude, and the processed cloth tends to shrink and wrinkle due to thread pulling, and the buttonhole is also prone to shrinkage in the width direction. Expands, making it impossible to create an aesthetically pleasing keyhole stitch

[0014] When forming buttonhole stitches on processed fabrics made of raised materials such as knitted fabrics, the buttonhole stitches tend to sneak into the underside of the raised portion of the processed fabric, resulting in poor appearance of the buttonhole stitches

In order to solve this problem, although it can be considered to form the keyhole stitch by overlapping cloth or paper on the predetermined position of the keyhole stitch, the disadvantage is that the work load increases, the work efficiency is reduced, and the appearance is poor.

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