Juki Corporation

Takashi Tsukioka

Takayuki Shiina

Tsuguo Kubota

Satoshi Kumon

Yoh Oda

Tadayoshi Minagawa

Mitsuhiro Tachikawa

Kazuaki Ishii

Yasuaki Hirano

Toshiaki Kasuga

Tadayoshi Minakawa

Hirokazu Okui

A cloth cutting knife 16 is structured such that the length of the cutting edge thereof is set shorter than the length of the side sewing portions of a buttonhole to be formed, and a buttonhole having a length corresponding to the length of the right and left side sewing portions can be formed by moving up and down the cloth cutting knife 16 two or more times. The cloth cutting knife 16 is moved up and down at least once during formation of the stitches of the right and left side sewing portions. Also, the cloth cutting knife 16 is moved up and down once each time a given number of stitches of the right and left side sewing portions are formed. The given number of stitches is set in accordance with both of the length of the cutting edge of the cloth cutting knife 16 and the length of the buttonhole to be formed.

Buttonhole darning sewing machine

A method is disclosed where a knot is formed in chain-stitching, and a first loop formed by a stitch to an article to be sewn, two stitches ahead of a final stitch, is drawn through a second loop which is formed by a stitch one stitch ahead of the final stitch, whereby a knot where the first loop is fastened by the second loop is formed, such that a third loop is inserted through the second loop and is then cut.

Chain-stitch sewing machine with knot tying

A knot is formed in chain-stitching, and a first loop, formed by a stitch to an article to be sewn two stitches ahead of a final stitch, is drawn through a second loop which is formed by a stitch one stitch ahead of the final stitch, whereby a knot is formed where the first loop is fastened by the second loop, such that a third loop is inserted through the second loop and is then cut.

Method of tying a knot in chain stitching

A apparatus for forming a knot where a knot is formed in chain-stitching. In the method, a first loop is formed by a stitch to an article to be sewn, two stitches ahead of a final stitch, is drawn through a second loop which is formed by a stitch one stitch ahead of the final stitch, whereby a knot where the first loop is fastened by the second loop is formed, such that a third loop is inserted through the second loop and is then cut. The sewing machine including a single needle and a rotary looper and including a yarn feed adjusting device for adjusting a degree of feed of a yarn to the single needle. The yarn feed adjusting device sets a fed volume of the yarn during formation of the second loop to a value larger than that of the final or third loop and the first loop.

Chain-stitch sewing machine with yarn feed adjusting

Growing community of inventors

Tokyo, Japan

Takashi Tsukioka