Patent ID: 9394639
Filing Date: 2016-07-19
CPC Classification: D05B,D05D

Claim Text:
1. A motorized thread tensioner for a sewing machine, the motorized thread tensioner comprising: a first disk; a second disk positioned next to the first disk; a spring configured to apply friction to a thread that is positioned between the first disk and the second disk by exerting a force against the second disk; a shaft having a head on a proximal end and threads on a distal end, the shaft being positioned through the first disk, the second disk, and the spring; a nut threaded onto the threads of the shaft; and an electric motor coupled to the nut and configured to rotate the nut in a first rotational direction and a second rotational direction that is opposite to the first rotational direction, the rotation of the nut in the first rotational direction causing the shaft to travel toward the electric motor which causes the spring to compress to apply increased friction to the thread, the rotation of the nut in the second rotational direction causing the shaft to travel away from the electric motor which causes the spring to decompress to apply decreased friction to the thread.