Patent ID: 6725793
Filing Date: 2004-04-27
Classification: D05B

Abstract:
The bobbin for a sewing machine, which is rotatably disposed in a rotary shuttle device of the sewing machine to supply an under thread when performing a sewing operation, comprising a winding shaft which is separately inserted onto a fixing shaft of the rotary shuttle device and on which the under thread is substantially wound, a first flange which is integrally formed at one end of the winding shaft, a second flange which is integrally formed at the other end of the winding shaft, and a partition flange for forming a first winding portion between the first flange and the partition flange and forming a second winding portion between the second flange and the partition flange, wherein a plurality of saw-toothed protrusions is formed at an entire outer circumference of the partition flange, and the protrusions has a linear sidewall that is orientated in a radial direction of the partition flange.