Remote-control system for sewing machine

Details Remote-control system for sewing machine Remote-control system for sewing machine

1988-12-12

1990-06-19

Shoop, Jr., William M.

Electricity: motor control systems

Open loop speed control system for dc motor with commutator

Analog armature control

388828, H02P 516

Patent

active

049348442

ABSTRACT:
A remote-control system is used in combination with a sewing machine for controlling revolution of a sewing machine motor. A remote-controller is connected to a main body of the sewing machine and operated by the sewing machine operator to change a resistance value of a variable resistor contained therein so that the sewing machine motor is driven under control in response to an output volume from the variable resistor. A condensor is connected to said variable resistor and chargeable by a power supply source mounted in the sewing machine main body. The output voltage is converted into a corresponding digital value at each timing when the condensor is saturated with electricity in response to a clock pulse signal at a predetermined interval. The output voltage at such timing will be in proportion to the resistance value of the variable resistor which is, in turn, in porportion to the amount of operation of the remote-controller.

REFERENCES:
patent: 4139808 (1979-02-01), Matsumura
patent: 4168455 (1979-09-01), Soeda et al.
patent: 4181876 (1980-01-01), Kato et al.
patent: 4232258 (1980-11-01), Matsumura
patent: 4246521 (1981-01-01), Soeda et al.
patent: 4274037 (1981-06-01), Soeda

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