CONTROL SYSTEM FOR A SEWING MACHINE

摘要

A control system for a sewing machine includes an impulse generating circuit and a counter means connected thereto. A four bit shift register and a mode selecting circuit connected thereto are provided. The system includes a circuit for feeding the work material or fabric forwards, a circuit for feeding the work material backwards, and a circuit for resetting these circuits. The system is capable of selecting, in advance, the number of stitches in a single forward and backward reciprocal non-ravel seam end. The system is also capable of doing a desired number of the repeated non-ravel seam endings at a certain place (repeated reciprocal non-ravel seaming mode); and the system is capable of selection between the non-ravel seam end mode and the abovementioned repeated non-ravel seaming mode. The selection is between the mode wherein a single starting non-ravel seam end and a single finishing non-ravel seam end are executed on the opposite ends of an ordinary straight seam and wherein the repeated nonravel seam end is executed for a desired number of repetitions.