Rotary-gripper counter-hook for double-lock-stitch sewing machin

Details Rotary-gripper counter-hook for double-lock-stitch sewing machin Rotary-gripper counter-hook for double-lock-stitch sewing machin

1981-03-23

1984-07-03

Reynolds, Wm. Carter

Sewing

Stitch forming

Revolving-hook type

112228, D05B 112, D05B 5708

Patent

active

044572441

ABSTRACT:
A double-lock-stitch sewing machine has a reciprocating needle forming an upper-thread loop with the aid of a rotary gripper assembly. The loop is carried by and formed by a main hook or point of the assembly around a stationary bobbin to engage a bobbin thread in a double-lock-stitch. A counter hook or counter point on the gripper assembly, which normally serves only to control movement of the loop from the main point, is formed on an underside with an auxiliary hook portion for drawing an extra thread length from the supply during each stitch and thus inhibiting bunching of the workpiece.

REFERENCES:
patent: 1995278 (1935-03-01), Kessler
patent: 2154403 (1939-04-01), Karle
patent: 2178543 (1939-11-01), Rubel et al.
patent: 2680417 (1954-06-01), Graesser
patent: 2694373 (1954-11-01), Covert et al.

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