Pneumatic needle positioning apparatus for stitching machines

Details Pneumatic needle positioning apparatus for stitching machines Pneumatic needle positioning apparatus for stitching machines

1975-12-08

1976-08-31

Hunter, H. Hampton

Sewing

With tables or stands

For plural sewing units

D05B 6922, D05B 6502

Patent

active

039773396

ABSTRACT:
Improved apparatus for positioning the needle of a stitching machine in a preselected position along its reciprocatory path including a pneumatically powered positioning motor connected to the drive shaft for the needle, a source of pressurized fluid (preferably air), conduit means connecting the source of pressurized fluid to the positioning motor, normally closed valve means interposed in the conduit means, and control means also interposed in the conduit means at a location between the valve means and the positioning motor and adaptable to activate and deactivate the motor for positioning the needle. Apparatus is provided to enhance the reliability and speed of start-up of the positioning motor and to enhance the accuracy of the position of the needle relative to its desired position at the end of a positioning cycle.

REFERENCES:
patent: 1880164 (1932-09-01), Whitehouse
patent: 3592153 (1971-07-01), Margereson

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