DEVICE AND METHOD FOR INFLUENCING THE POSITION OF KNOTS BETWEEN THE UPPER THREAD AND THE LOWER THREAD WHEN SEWING WITH A SEWING MACHINE

摘要

A device and the method for influencing the position of the knot (31) between the upper thread (23) and the lower thread (17) when sewing with a sewing machine (1) using a computer (37), which calculates for every sewing stitch to be formed a control value for an actuator (39), by which a braking force of the thread tension regulator (23) is controlled.

主权项

1. A device for controlling a position of knots (31) between an upper thread (21) and a lower thread (17) when sewing a material (15) with a sewing machine (1), comprising a thread tension regulator with an actuator (39), the actuator (39) being configured to influence a tensile force FAR applied upon the knot (31) during tightening of the knot (31) of the upper thread (21) and the lower thread (17), a guide parameter for the actuator (39) is individually predeterminable for every sewing stitch or for every group of several successive sewing stitches by a computer (37) of the sewing machine (1).