Needle positioner for sewing machine

Details Needle positioner for sewing machine Needle positioner for sewing machine

1981-03-17

1983-11-15

Nerbun, Peter P.

Sewing

Elements

Starting or stopping

112221, 112276, D05B 6922, D05B 6908

Patent

active

044149093

ABSTRACT:
A needle positioner for a sewing machine having a shaft connected to a main drive motor to move a sewing machine needle reciprocally by a stitching operation which includes a crank rotatably supported on a frame drivably connected to the sewing machine shaft with a plurality of pneumatically actuated cylinder/piston assemblies, the pistons of which are engagable with the crank to move the crank and therefore the shaft through predetermined rotary angles together with a plurality of conduits having valves including control valves therein which are adapted to communicate the cylinder/piston assemblies with a source of pneumatic pressure so that selective actuation of the control valves produces rotary movements of the crank through the appropriate cylinder/piston assembly to move the needle into either a top or bottom position.

REFERENCES:
patent: 3320914 (1967-05-01), Adams
patent: 3913508 (1975-10-01), Boser
patent: 4270474 (1981-06-01), Tice

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