Thread feed mechanism in sewing machine

Details Thread feed mechanism in sewing machine Thread feed mechanism in sewing machine

1984-09-27

1986-01-28

Nerbun, Peter

Sewing

Elements

Thread guiding or handling

112278, 112453, D05B 4500

Patent

active

045663963

ABSTRACT:
A thread feed mechanism in a sewing machine for paying-out thread in a predetermined amount necessary for forming one seam. The thread feed mechanism comprises a first signal generation device for producing feed amount and needle bar amplitude signals, a second signal generation device for producing a workpiece thickness signal, first means for adding square values of feed amount and amplitude signals, second means for multiplying a square root of the first means by a coefficient, third means for producing a signal varying depending upon the operation mode thereof, fourth means for multiplying a workpiece thickness signal by the output of the third means, and fifth means for adding the outputs of the second, third and fourth means.

REFERENCES:
patent: 4215641 (1980-08-01), Dobrjanskyj et al.
patent: 4267787 (1981-05-01), Fukuda
patent: 4289087 (1981-09-01), Takenoya et al.
patent: 4408554 (1983-10-01), Takiguchi et al.

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