Sewing machine with improved non-ravel seaming controller

A control circuit for controlling the rotating speed of a clutch and brake motor of a sewing machine capable of performing non-ravel seaming at the start and the end of a sewing operation comprising start switch means for generating a start signal indicating the start of said sewing operation, first speed signal generator means for generating a signal representing the actual speed of said clutch and brake motor, needle position detector means for generating a needle position signal at each reciprocation of the needle, second speed signal generator means for generating a desired speed signal, operator controlled thread cutting switch means for generating a thread cutting signal, speed control means for controlling the speed of said clutch and brake motor by comparing the desired speed signal from said second speed signal generator means and the actual speed signal from said first speed signal generator means, and a non-ravel seaming controller which comprises first means for enabling said non-ravel seaming for a first predetermined duration subsequent to receipt of said start signal from said start switch means, and second means for generating a medium speed signal no greater than a predetermined level less than a normal speed at a predetermined time after the receipt of said thread cutting signal and applying said medium speed signal to said speed controller for controlling the speed of said clutch and brake motor in accordance therewith and for enabling said non-ravel seaming for a second predetermined duration at the end of said sewing operation.