Digital speed control system for sewing machines

Details Digital speed control system for sewing machines Digital speed control system for sewing machines

D - Textiles, Paper

05

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342/35, 341/93

D05B 69/18 (2006.01) G01D 5/347 (2006.01) G05B 15/02 (2006.01) G05D 13/62 (2006.01) H02P 23/00 (2006.01) H02P 29/00 (2006.01)

Patent

CA 1155530

?5-8021/-MK TITLE DIGITAL SPEED CONTROL SYSTEM FOR SEWING MACHINES ABSTRACT OF THE DISCLOSURE 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 a binary data representing the sensed interval. The interval representing data is translated into a 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 a sign of the second period data to accelerate or decelerate the sewing machine.

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