Patent ID: 9631305
Date: 2017-04-25
CPC Classifications: D05B

Claim:
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 F AR applied upon the knot ( 31 ) during tightening of the knot ( 31 ) of the upper thread ( 21 ) and the lower thread ( 17 ), a computer ( 37 ) to control the actuator that individually predetermines a guide parameter for the actuator ( 39 ) for every sewing stitch or for every group of several successive sewing stitches.