Sewing machine with differential feed

Details Sewing machine with differential feed Sewing machine with differential feed

1986-10-27

1988-02-23

Reynolds, Wm. Carter

Sewing

Stitch forming

Feeding work material

112235, D05B 2706, D05B 2708, D05B 2902

Patent

active

047263091

ABSTRACT:
A sewing machine with adjustable upper and lower feed dogs is for sewing together sections of clothing in which ungathered segments of seams alternate with seam segments with differing degrees of gather. The spring-held presser foot is coordinated with a pneumatic cylinder as an additional mechanism of increasing contact pressure during the sewing of ungathered segments of seams. The cylinder is operable by a control cam connected to an adjusting mechanism for a stitch guide of one of the feed dogs. When sewing gathered segments, the pressure of the presser foot is greatly reduced, whereas the pressure is increased during the sewing of gathered seam segments and through a "fastening" step at the end of the seam.

REFERENCES:
patent: 2705908 (1956-06-01), Odermann et al.
patent: 3009432 (1961-11-01), Reeber et al.
patent: 3665877 (1972-05-01), Wickers et al.
patent: 4381722 (1983-05-01), Takeuchi et al.
patent: 4589364 (1986-05-01), Yamamoto et al.

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