CAM MECHANISM FOR INTERMITTENT MOTION OF A RECIPROCATING SLIDE

Slide 1 reciprocates continuously while slide 2 operates Intermittently. In each cycle of the mechanism, slide 2 travels with slide 1 during one forward and one return stroke, and then dwells for the three consecutive forward and return strokes of slide I. As shown, the slides are locked together by plunger 3 and are beginning their return stroke to the left. During the stroke, spring-loaded pawl 6 engages Indexing pin a of cam 5, and turns the cam 90. Pin b, when cam 5 is indexed, depresses pawl 6, over- coming the resistance of spring 9. As cam 5 turns, its projection f slides upward a long deep slot c in housing 8 and drops into one of three shallow slots d. This withdraws plunger 3, disengaging it from slide 2 and compressing spring 4. As this occurs before the return stroke Is completed, stop 10 of slide 1, through stop 11 of slide 2, pushes slide 2 to its extreme left- hand position where spring-loaded button 7 engages a depression in pad 12, holding slide 2 until projection f of cam 5 drops Into deep slot c again. This occurs when cam 5 has been indexed through 270°, i.e. after three forward and three return strokes of slide 1. Shallow slots d In housing 8 prevent the cam from reversing after being indexed due to back drag on the indexing pins when they leave pawl 6.
$3079$SmC,ML$