Microprocessor controlled electronic sewing machine

In an electronic type sewing machine having a bed, a standard rising from said bed, a horizontal arm overhanging said bed, said arm ending with a head, a needle bar means disposed in said head for enabling transverse oscillation thereof relative to the direction of fabric feed in said sewing machine, feed means for adjusting the length and direction of said fabric feed, actuator means for adjusting the transverse position of said needle bar means and the positional displacement of said feed means in response to control signals provided thereto and first static memory means for retrievably storing a first plurality of different predetermined stitch patterns each having associated retrievably stored bight and feed data corresponding to predetermined positional coordinates of said needle bar and feed means for defining associated stitch position coordinates for the stitches comprising said stitch patterns;

• the improvement comprising microcomputer integrated circuit means operatively connected to said static memory means and to said actuator means, and means operatively connected between said actuator means and said microcomputer means for providing a digital input signal to said microcomputer means representative of the actual position of said actuator means, said microcomputer means, said actuator means and said actual position signal providing means comprising a position servo control loop, said microcomputer means comprising a master/slave microcomputer configuration means for selectively processing said stored stitch pattern data from said static memory means and for digitally comparing said actual position digital input signal with said selectively processed stored stitch pattern data for said position servo control loop for providing an output control signal to said actuator means based on said selectively processed stitch pattern data for controllably adjusting at least the transverse position of said needle bar means, said slave microcomputer means comprising said means for digitally comparing said actual position digital input signal with said selectively processed stored stitch pattern data and said master microcomputer means comprising means for selectively processing said stored stitch pattern data and providing said selectively processed stored stitch pattern data to said slave microcomputer means, said slave microcomputer means comprising means for closing said position servo control loop.

In an electronic type sewing machine having a bed, a standard rising from said bed, a horizontal arm overhanging said bed, said arm ending with a head, a needle bar means disposed in said head for enabling transverse oscillation thereof relative to the direction of fabric feed in said sewing machine, feed means for adjusting the length and direction of said fabric feed, actuator means for adjusting the transverse position of said needle bar means and the positional displacement of said feed means in response to control signals provided thereto and first static memory means for retrievably storing a first plurality of different predetermined stitch patterns each having associated retrievably stored bight and feed data corresponding to predetermined positional coordinates of said needle bar and feed means for defining associated stitch position coordinates for the stitches comprising said stitch patterns;

• the improvement comprising microcomputer integrated circuit means operatively connected to said static memory means and to said actuator means, and means operatively connected between said actuator means and said microcomputer means for providing a digital input signal to said microcomputer means representative of the actual position of said actuator means, said microcomputer means, said actuator means and said actual position signal providing means comprising a position servo control loop, said microcomputer means comprising a master/slave microcomputer configuration means for selectively processing said stored stitch pattern data from said static memory means and for digitally comparing said actual position digital input signal with said selectively processed stored stitch pattern data for said position servo control loop for providing an output control signal to said actuator means based on said selectively processed stitch pattern data for controllably adjusting at least the transverse position of said needle bar means, said slave microcomputer means comprising means for digitally comparing said actual position digital input signal with said selectively processed stored stitch pattern data and said master microcomputer means comprising means for selectively processing said stored stitch pattern data and providing said selectively processed stored stitch pattern data to said slave microcomputer means.