Sewing assembly with a feed drive for a work holder

Details Sewing assembly with a feed drive for a work holder Sewing assembly with a feed drive for a work holder

1978-07-06

1979-06-12

Feldbaum, Ronald

Sewing

Special machines

Darning

112303, 112220, D05B 2100

Patent

active

041576861

ABSTRACT:
The invention relates to a feed drive for work holders of sewing assemblies, by which, during the formation of the initial stitches of a seam taking place at a low speed, the control cam plate moving the work holder is driven at a reduced speed, and, during the formation of the main part of the seam taking place at a high sewing speed, the control cam plate is driven intermittently in a manner such that at every lowermost position of the needle, the work holder is temporarily stopped. The feed drive comprises a planetary gearing having two inputs, of which the first input can receive a constant rotary motion, and the second input can receive, at the start of the seam formation, a continuous rotary motion which is subtractively superimposed upon the rotary motion at the first input, and, during the ordinary sewing operation, an oscillatory motion whose frequency is equal to the frequency of the needle bar motion.

REFERENCES:
patent: 3358626 (1967-12-01), Bryan
patent: 3543737 (1970-12-01), Maschmann
patent: 3983825 (1976-10-01), Dobner et al.
patent: 4088085 (1978-05-01), Hager

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