Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1980-10-23
1983-05-31
Truhe, J. V.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318313, 318327, 318341, 318345E, H02P 504
Patent
active
043863019
ABSTRACT:
A digital speed control system for a sewing machine comprises a digital speed setting device which responds to manual depression of a foot pedal by generating a digital position signal. A variable frequency divider divides the frequency of speed related pulses so that its output frequency is an integral submultiple of the input frequency, which is variable as a function of the digital position signal. A period detector senses the interval between pulses that occur successively at the output of the frequency divider and generates binary data representing the sensed interval. The interval representing data are translated into second period data in an arithmetic unit according to a predetermined transfer function. A pulse generator translates the second period data into a pulse for activating a magnetic clutch or a magnetic brake depending on the sign of the second period data to accelerate or decelerate the sewing machine.
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Dohi Takashi
Neki Shigeo
Shinozaki Nozomu
Matsushita Electric - Industrial Co., Ltd.
Moose Richard M.
Truhe J. V.
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