Electronic sewing machine

Details Electronic sewing machine Electronic sewing machine

1980-03-18

1982-02-16

Nerbun, Peter P.

Sewing

Work manipulating

Guides

112277, D05B 302

Patent

active

043154727

ABSTRACT:
When a pulse motor in an electronic sewing machine is to be subjected to a heavy load, the pulse motor is operated at a slower speed in order to cause the pulse motor to operate at a rate in which it has a maximum torque output. For lesser load conditions, pulse motor speed is allowed to increase. Speed control of the pulse motor follows a generally trapezoidal curve, which curve includes a speed-up section and a slow-down section, and may include a flat section. That portion of the generally trapezoidal curve along which motor speed follows is determined by the distance which the pulse motor is required to move.

REFERENCES:
patent: 4103632 (1978-08-01), Bowles
patent: 4108093 (1978-08-01), Watanabe et al.
patent: 4196683 (1980-04-01), Eguchi

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