Sewing control system for multiple-pattern sewing machine

摘要

A sewing control system for multiple-pattern sewing machine has a microprocessor coupled with a memory unit (ROM and/or RAM) and a switch matrix for designating a desired stitch pattern to achieve automatic sewing of a variety of stitch patterns. For stitch data formats processed by the microprocessor, there are used fixed-length or variable-length data including an operation code for designating data operations and a stitching frequency and a symbol code for designating the length and direction of a unit stitch. The memory unit stores a plurality of pattern data consisting of a number of stitch data each corresponding to the stitch pattern and a selection program for selecting the desired stitch pattern among these pattern data. When the desired pattern data designated by the switch matrix is selected among the pattern data in accordance with the selection program, A sewing machine provided with the control system performs sewing operation with the length and direction of each stitch specified as a vector in polar coordinates in accordance with the desired pattern data.