Randel P Smith: Patterning device for tufting machines or the like. The Singer Company, Edward L Bell, Robert E Smith, Alan Ruderman, June 22, 1976: US03964408 (16 worldwide citation)

A patterning device for a tufting machine including a rotary shaft carrying three cams and driven in timed relationship with the tufting machine. Two of the cams each act to cyclically oscillate a respective pawl carrying carriage in opposite directions toward and away from the other during a substa ...