Chain stitch sewing machine

Details Chain stitch sewing machine Chain stitch sewing machine

1985-02-15

1987-02-17

Reynolds, Wm. Carter

Sewing

Stitch forming

Chain or double chain

112310, 112315, D05B 110, D05B 2722, D05B 5702

Patent

active

046431136

ABSTRACT:
A double chain stitch sewing machine having a feeding device with a feed dog oscillatingly movable in and opposite to the feeding direction for producing a relative movement between a workpiece and the sewing machine. It has a needle reciprocatingly driven by a crank mechanism, at which the feeding mechanism also imparts synchronous jogging movements to the needle in order to generate a needle feed movement. The reciprocatingly and joggingly driven needle cooperates with a looper oscillatingly driven by a looper drive mechanism in parallel with the feeding direction. The looper drive mechanism is formed as a six-bar-linkage-mechanism provided at the input with a stationary pivot and at the output with a stationary pivot and provided with an intermediate pivot. The looper is oscillatingly swung at a relative high velocity from one extreme position to the other at an input motion with constant angular velocity and the looper is moved with a short period of dwell in that extreme position located in the feeding direction and moved with long period of dwell in that extreme position located oppositely to the feeding direction.

REFERENCES:
patent: 1659443 (1928-02-01), Redin
patent: 2292724 (1942-08-01), Thompson et al.
patent: 3285210 (1966-11-01), Tretow et al.
patent: 3457888 (1969-07-01), Wider
patent: 3742880 (1973-07-01), Franz

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