Cam selecting device for a sewing machine

摘要

A sewing machine has a drive shaft that rotates relative to the machine frame in order vertically to reciprocate a needle and to rotate a pack of pattern cams. A cam follower is displaceable along this pack and engageable with each of the cams for controlling the stitch pattern of the machine needle. A rotatable dial carried on the machine serves both to displace the cam follower from a position engaging one of the cams into a disengaged position clear of the cams, and for displacing this follower along the pack of cams. On rotation of the dial the cam follower is first lifted off the cams and only then is it displaced along the pack. Once lifted off the pack the cam follower is held away from the pack until either the dial is depressed so as to automatically to release it from its disengaged position, or the sewing machine is operated so that the rotating drive shaft of the machine automatically releases the cam follower when it attains a predetermined angular position.