Method and apparatus for controlling a sewing machine

Details Method and apparatus for controlling a sewing machine Method and apparatus for controlling a sewing machine

1991-01-04

1993-01-19

Wysocki, A. Jonathan

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318269, H02P 500

Patent

active

051809540

ABSTRACT:
A sewing control system for controlling the speed of rotation of a sewing machine in which in a first embodiment, a rotation transfer ratio operation is inhibited during the time that slip occurs. According to a second embodiment, the rotation transfer operation is initiated only when the number of revolutions of the motor shaft is higher than a predetermined value. In a third embodiment, slip is prevented by not outputting a speed instruction which is not steeper than a predetermined gradient. In a fourth embodiment, when an abnormal condition is detected, the rotation transfer ratio is reduced in order to reduce the speed of the motor, thereby assuring the safety of an operator.

REFERENCES:
patent: 3573581 (1971-04-01), Dutko et al.
patent: 3715642 (1973-02-01), Walter
patent: 3959704 (1976-05-01), McCrea
patent: 4028593 (1977-06-01), Newell
patent: 4509088 (1985-04-01), Profio
patent: 4642536 (1987-02-01), Boyd, Jr. et al.
patent: 4691653 (1987-09-01), Neki et al.
patent: 4692676 (1987-09-01), Dohi et al.
patent: 4738211 (1988-04-01), Nakamura et al.

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