Multifunction switching control system

Details Multifunction switching control system Multifunction switching control system

1990-04-02

1991-04-16

Ro, Bentsu

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

318272, 112275, 112277, H02P 700, D05B 6926

Patent

active

050086014

ABSTRACT:
A multifunction switching control system includes: a sewing speed controller of a computerized sewing machine controlled in response to a voltage of a sliding terminal of a variable resistor incorporated in the controller; an invariable resistor; a first A/D converter for converting the voltage from an analog signal to a first digital signal; and a second A/D converter for converting a voltage at a fixed terminal of the variable resistor from an analog signal to a second digital signal. A switch circuit for directly connecting one terminal of the invariable resistor to the fixed terminal of the variable resistor is provided in the controller. By comparing the second digital signal with a preset value, it is determined whether or not the switch circuit is so operated. In case that the switch circuit is so operated, sewing operation other than sewing speed controls of the machine are conducted.

REFERENCES:
patent: 3100554 (1963-08-01), Doubek
patent: 3582748 (1971-06-01), Kato
patent: 3597772 (1971-08-01), Seesselberg
patent: 4090664 (1978-05-01), Elderkin
patent: 4139808 (1979-02-01), Matsumura
patent: 4501210 (1985-02-01), Hanyu et al.
patent: 4739232 (1988-04-01), Ishimoto
patent: 4920304 (1990-04-01), Antonowitz

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