Patent ID: 6065411
Filing Date: 2000-05-23
Classification: D05B

Abstract:
An amplitude adjusting device of a sewing machine having a main shaft rotated to vertically reciprocate a needle bar having a needle attached to the lower end thereof and being supported on a laterally swingable needle bar holder and an amplitude generating mechanism including a pattern cam rotated in association with rotation of the main shaft and a cam follower having a central axis thereof around which the cam follower is swingable, the cam follower having one end engaging the pattern cam and the opposite end operatively connected to the swingable needle bar holder and being swingable in accordance with the configuration of the pattern cam, said amplitude adjusting device comprising:adjusting means normally activated to hold said swingable needle bar holder at a standstill while said cam follower is swingingly moved;operating means operatively connected to said adjusting means and manipulated in one direction to operate said adjusting means, thereby to enable said swingable needle bar holder to swingingly move in accordance with the swinging movement of said cam follower; andpositioning means operatively connected to said operating means when the latter is manipulated in another direction, said positioning means activated in association with said manipulation in said one direction of said operating means to hold said swingable needle bar holder at a constant swinging amplitude in accordance with the swinging movement of said cam follower.