| 摘要 |
A bobbin thread winder mounted in an arm of a sewing machine to wind thread from thread supply onto a bobbin includes a thread winding shaft to which the bobbin is set and which is rotated by a timing pulley, a thread winding shaft gear attached to an end side of the shaft and having a first gear portion rotatable coaxially with the shaft, a second gear portion formed integrally on the timing pulley so as to be mesh-engageable with the first gear portion, and a torque limiter mechanism transmitting rotation of the shaft gear to the shaft when load exerted on the shaft is below a predetermined value, the torque limiter mechanism cutting off transmission of rotation of the shaft gear so that rotation of the shaft gear is prevented from being transmitted to the shaft when load exerted on the shaft is not less than the predetermined value.
|
