Apparatus for automatically adjusting the stitch pitch of a sewi

Details Apparatus for automatically adjusting the stitch pitch of a sewi Apparatus for automatically adjusting the stitch pitch of a sewi

1986-02-06

1988-02-02

Nerbun, Peter

Sewing

Stitch forming

Feeding work material

112272, 112275, 11212111, D05B 2722

Patent

active

047222913

ABSTRACT:
An automatic stitch pitch adjusting apparatus for a sewing machine allows the last stitch point to be terminated at a pre-set point. Three workpiece-end sensors are positioned respective a needle hole position to precisely calculate the required actual stitch line length. Reference signals generated by rotation of a main shaft are used to calculate both the required number of stitchings and the adjusted stitch pitch to terminate stitching at the pre-set point. Where the workpiece end line is not normal against the feeding line, the pre-set margin distance is adjusted to calculate the actual required stitching line length to the last pre-set point.

REFERENCES:
patent: 4495877 (1985-01-01), Willenbacher
patent: 4528923 (1985-07-01), Hager
patent: 4545310 (1985-10-01), Treadwell et al.
patent: 4587915 (1986-05-01), Wenz et al.
patent: 4602577 (1986-07-01), Kothe et al.

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