Positioning device for sewing machine main shaft

Details Positioning device for sewing machine main shaft Positioning device for sewing machine main shaft

1986-01-10

1987-07-07

Schroeder, Werner H.

Sewing

Elements

Starting or stopping

112221, 112276, D05B 6922, D05B 6908

Patent

active

046779264

ABSTRACT:
A drive device for positioning a sewing machine main shaft and driven by a positioning motor into a needle-up position when it is stopped for example, after the thread is cut comprises a removable drive lever member which has a tappet portion which engages wtih the shoulder of a cam which is mounted on the main shaft for rotation therewith. The drive lever is driven by a device such as a fluid pressure operated piston cylinder combination and when it moves the tappet engages the cam face and rotates the cam with the main shaft to a second position which is predetermined. The mechanism also includes a stop which is effected between a face of the cam and a lever member which is shifted by the drive lever to stop the backward movement of the cam with the main shaft at a precise second position.

REFERENCES:
patent: 1850708 (1932-03-01), Davis
patent: 2088266 (1937-07-01), Jafferian
patent: 3026835 (1962-03-01), Hall
patent: 4423692 (1984-01-01), Kelly et al.
patent: 4515098 (1985-05-01), Walther

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