Differential feeding apparatus for a sewing machine

Details Differential feeding apparatus for a sewing machine Differential feeding apparatus for a sewing machine

1991-08-12

1992-04-14

Schroeder, Werner H.

Sewing

Stitch forming

Feeding work material

D05B 2700

Patent

active

051037513

ABSTRACT:
A feeding apparatus includes a spindle and a shaft disposed in a base of a sewing machine. A lever is fixed on the shaft and can be caused to swing by the spindle. Two followers are engaged on the spindle. A pawl is fixed on each follower for feeding cloth. One follower is coupled to one end of the lever and the other follower is coupled to the other end of the lever by a link and a lever arm. The amplitude of swinging of the lever arm can be changed so that one of the pawls can be caused to move back and forth relative to the other pawl.

REFERENCES:
patent: 2771848 (1956-11-01), Knaus et al.
patent: 3450079 (1969-06-01), Lukin
patent: 3611817 (1971-10-01), Smith et al.
patent: 4295434 (1981-10-01), Hsiao
patent: 4436045 (1984-03-01), Bonham et al.
patent: 4674426 (1987-06-01), Kasuda et al.

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