Zig-zag needle bar bearing unit

Details Zig-zag needle bar bearing unit Zig-zag needle bar bearing unit

1989-11-30

1992-03-31

Schroeder, Werner H.

Sewing

Stitch forming

Zigzag

112221, D05B 302

Patent

active

050997769

ABSTRACT:
In a sewing machine, a needle-bar is slidingly mounted in two bearings, the external surface of each of which has a spherical profile. The bearings are pivotably engaged in respective seats of complementary profile provided in a fixed support, for an upper bearing, and in a movable lever, for a lower bearing. This lever is alternately pivoted into two opposite positions under the action of a stepper motor. The motor drives the movable lever by engagement of a pinion with peripheral gear teeth carried by the movable lever.
The motor, the fixed support, the movable lever, the bearings and the needle bar form a self-contained and detachable assembly.

REFERENCES:
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patent: 4215638 (1980-08-01), Johnson
patent: 4458611 (1984-07-01), Arendash
patent: 4873932 (1989-10-01), Adams
patent: 4895090 (1990-01-01), Adams et al.

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