Patent ID: 9605366
Date: 2017-03-28
CPC Classifications: D05B

Claim:
1. A sewing machine comprising: an upper shaft rotatable so as to drive a needle bar; a lower shaft rotatable so as to drive a hook; an upper-shaft pulley attached to the upper shaft; a lower-shaft pulley attached to the lower shaft; a belt linking the upper-shaft pulley and the lower-shaft pulley, and synchronizing a rotation of the upper-shaft pulley and a rotation of the lower-shaft pulley with each other; a belt adjusting mechanism contacting the belt and absorbing slack at a tensioned side at which the belt is drawn by moving in or away from a direction in which the belt adjusting mechanism pushes the tensioned side; and a tensioner tensioning the belt in accordance with an absorbing level of the slack of the belt; wherein the tensioner comprises; a tension adjusting idler contacting the belt at the loosened side where the belt is drawn out; and an elastic member connecting to the tension adjusting idler.