Looper drive mechanism of a sewing machine

Details Looper drive mechanism of a sewing machine Looper drive mechanism of a sewing machine

1992-07-01

1994-04-05

Crowder, Clifford D.

Sewing

Stitch forming

Overseaming

112199, 112200, 112220, 74 25, D05B 120, D05B 110

Patent

active

052995160

ABSTRACT:
A looper drive cam is formed of a cylindrical cam which is fixed to a main shaft so that its axis is inclined thereto at an angle of .theta.. A looper drive fork forming an U-shaped cam follower is attached to a looper drive shaft, and is engaged with the inclined cam. The fork is attached to the looper drive shaft with a degree of freedom which allows for deviation between axes of the main shaft and the looper drive shaft. As the main shaft rotates, a cam face of the inclined cam changes in a range of .+-..theta. in a plane containing the main shaft, so that the fork rotates to rotate the looper drive shaft. Owing to the freedom of degree of the fork thus attached, the motion is transmitted smoothly, and wear and rattling are prevented.

REFERENCES:
patent: 2151832 (1939-03-01), Bugatti
patent: 3885509 (1975-05-01), Cox
patent: 3915129 (1975-10-01), Rust et al.
patent: 4022140 (1977-05-01), Lienemann
patent: 4690080 (1987-09-01), Mikuni et al.
patent: 4967677 (1990-11-01), Seiriki et al.
patent: 5092186 (1992-03-01), Frank

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