One-step buttonhole mechanism for sewing machine

Details One-step buttonhole mechanism for sewing machine One-step buttonhole mechanism for sewing machine

1976-08-30

1978-08-15

Nerbun, Peter

Sewing

Work manipulating

Guides

D05B 302, D05B 306

Patent

active

041064186

ABSTRACT:
A device in a domestic sewing machine for automatically sewing a buttonhole pattern in four successive stages comprising, in order, lock stitches at one end, stitches to one side, lock stitches at the other end, and finally stitches at the other side. Only a single manual step, that of presetting an adjustable element to program the desired length of the buttonhole, is required of the operator to condition the machine. The device includes a set of cams for controlling needle amplitude, lateral position or base line, and direction and rate of feed. The cams are rotationally driven by a pair of ratchet wheels in timed relation to the formation of stitches. Means are provided to alternately establish and interrupt the drive to the ratchet wheels, and therefore the cams, at certain times in the sequence to effect appropriate changes in the sewing pattern.

REFERENCES:
patent: 3090334 (1963-05-01), Hayashi et al.
patent: 3444832 (1969-05-01), Gray
patent: 3656443 (1972-04-01), Ross
patent: 3841246 (1974-10-01), Casner et al.

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