Electronically programmed needle swing and fabric feeder mechanisms

摘要

A sewing machine for one or several types of stitches has a driving mechanism for the presser foot feeding the fabric, the direction and the amplitude of which are adjustable. The needle bar slides in an oscillating bracket and the amplitude of this oscillation is also adjustable. At least one stepping motor is provided to energise (part of) the mechanism moving the pivoting bracket and/or (part of) the mechanism driving the presser foot. An electronic control system transmits signals to each motor representing its direction of motion and the number of steps to be taken.A very wide range of different types of stitches are produced varying in width and length.