Sewing machine having a soft-starting circuit

Details Sewing machine having a soft-starting circuit Sewing machine having a soft-starting circuit

D - Textiles, Paper

05

B

341/100, 341/93

D05B 69/18 (2006.01) D05B 69/00 (2006.01) G05B 15/02 (2006.01) H02P 29/00 (2006.01)

Patent

CA 1183245

ABSTRACT OF THE DISCLOSURE A sewing machine comprises a pedal position detector for detecting the position of a manually operated foot pedal and generating therefrom a pedal position indicating signal. A predetermined position of the armshaft of the sewing machine is detected for generating an armshaft position signal. A soft-start speed setting circuit is provided for successively generating a soft-start speed setting signal of an increasing value as a function of time in response to the occurrence of the armshaft position signal. The soft-start speed setting signal is enabled when it is smaller in magnitude than the pedal position indicating signal and conversely the pedal position indicating signal is enabled when the latter is smaller than the soft-start speed setting signal. The enabled signal is used to control the speed of the sewing machine.

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