Sewing machine of a sewing machine by wireless controller

Details Sewing machine of a sewing machine by wireless controller Sewing machine of a sewing machine by wireless controller

1989-05-19

1990-12-11

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388824, 318446, 318480, 318663, 112277, H02P 504

Patent

active

049765523

ABSTRACT:
A sewing machine having a wireless controller is disclosed, wherein the sewing machine substantially comprising a drive motor for driving the sewing machine, a separate controller adjustably operated to produce a variable set voltage for controlling the rotation speed of the drive motor, a converter for converting the set voltage to a corresponding digital value and producing a series of data on the basis of the digital value, a device for producing carrier waves, modulator for modulating the series of data by way of the carrier waves and producing modulated waves, transmitter means responsive to the modulated waves to produce a corresponding light signal, means for receiving the light signal, demodulator for demodulating the received light signal, and a device responsive to the demodulated light to control the rotation speed of said drive motor.

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