Sewing machine having a memory for generating a speed control signal in response to operating conditions.

摘要

Disclosed is a sewing machine having a tachogenerator (2) for generating pulses at a frequency proportional to the speed of the sewing machine and a position detector (50, 52) for detecting the position of a foot pedal (51). A condition detector (54) is provided for detecting the operating conditions of the sewing machine in which it its to be subsequently operated and generating thereform a corresponding condition indicating signal and a manually adjustable binary code generator (53) for generating a speed indicating binary code in response to the condition indicating signal. - Further included is a digital memory (55, 56, ROMo-ROMn) responsive to the position indicating signal and the speed indicating binary code for generating a digital speed control signal. The pulses generated by the tachogenerator is processed in accordance with the speed control signal to control the amount of motive power transmitted from a motor to the sewing machine.