Abstract
The paper presents the tension regulator of the Shuttle thread of the sewing machine, which consists of an arc-shaped plate spring, has two holes, the first for fixing the screw to the side surface of the bobbin cap and the second for the adjusting screw. In this case, the width of the plate spring along the entire length is the same. A disadvantage of the known design of the Shuttle thread tension regulator is that it is not possible to provide thread tension due to changes in the pressure force of the plate spring along its length in the areas of contact with the thread passing between the plate and the side surface.
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