Patent ID: 9016219
Filing Date: 2015-04-28
Classification: D05B

Abstract:
1. A tension release device for compensating mechanical error of a tension device for a sewing machine, on a top of a base of the sewing machine being provided at least one said thread tension device, and each said at least one thread tension device for controlling tension of sewing thread being provided with an upright control wheel sleeved on a control shaft which is pivoted to a shaft holder on the base, the tension release device being pressed against one end of the control shaft, at one side of the base being slidably provided a presser rod driven by a actuating device, at one end of the presser rod being fixed a presser, the tension release device being characterized in that: the tension release device includes a rotary arm, a tension release shaft, a guiding member, an actuating member, and a micro-adjustment member, the rotary arm is located at one end of the tension release shaft which is inserted through the base, the tension release shaft is coupled to the guiding member and serves as a rotation center of the guiding member, the guiding member is provided at a side thereof facing the actuating member with an arc-shaped guiding flange which includes a first end and a second end higher than the first end; on the actuating member is provided a push portion which is pushed against the guiding flange of the guiding member, a micro-adjustment hole is formed at one end of the actuating member or at the one end of the control shaft, and the micro-adjustment member is screwed in the micro-adjustment hole and extends toward another end of the actuating member or the control shaft.