Ornamental stitch sewing machine

In an ornamental stitch sewing machine comprising a frame, a feed dog, means for imparting movement to the feed dog, control means for varying the amplitude and the direction of the feed movements of the feed dog during sewing, means including a first cam and first cam tracking element for mechanically and automatically imparting movement to the control means to vary the amplitude and direction of the feed movement of the feed dog during sewing, a needle bar mounted for endwise reciprocation and for sidewise movement transversely of the direction of reciprocation, a second cam, a second cam tracking element, means biasing the first and second cam tracking elements against respective cams whereby the tracking elements will track and respond to said respective cams, transmission mechanism connecting the second cam tracking element with the needle bar for shifting the needle bar sidewise in conformance with the cam response of the second tracking element, means for rotating said cams in synchronism with the needle bar reciprocating movements, said first and second cams being coaxially mounted in spaced relation on a drive shaft for rotation therewith with said second cam being axially slidable, spring means normally biasing said second cam axially of said shaft into operative registration with said second tracking element, a third cam arranged to be received on said shaft in superposed relation to said second cam so as to displace said second cam from registration with said second tracking element, and means for releasably securing said third cam on said shaft in operative registration with said second tracking element whereby said second tracking element will respond only to said third cam with said second cam being rendered ineffective.