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barrel slot and the indexing cam B indexes the barrel by 1 / 1 0 revolution through leve rs ( 2 ) and (3 ). The lockpin engages the next slot on the barrel . Both levers are returned to their initial positions by springs . Part positioning and ejecting FIGURE 39. Kinematic diagram of the S-44A machine At the end of a complete cam revolution lever ( 3 ) (Figure 42 ) re- engages the pawl (4 ) and pulls it out of the groove in ring (6 ). This interrupts the cam rotation until the next indexing of the spindle barrel . The handle ( 4 ) (Figure 4 1 ) serves for manual rotation o f the spindle barrel . The spindle-feed cam D (Figure 4 3 ) and the carriage-lift cam E (Figure 44 ) , operating through lever systems ,feed the drilling spindle and lift the car riage when the stud disk indexes . The lever systems are equipped with devices for feed and lift adjustm ent. 2 4 5 |