When slide 1 reciprocates a long its fixed guides, follower 3 reciprocates in a fixed guide in a direction perpendicular to that of the slide. Cam member 2 consists of core c in which a number of cam inserts are secured. The inserts may be tapered at different angles and may be of different heights. When slide 1 travels to the right, roller 5 of follower 3 rolls a long bearing B and then a long the working surface of cam insert a, raising the follower. As the slide travels to the left, the follower is lowered by a spring (not shown). Near the end of the return stroke of slide 1, a tooth of ratchet wheel 6, which has as many teeth as there are inserts and rotates about axis A of slide 1, engages pawl 7. Pawl 7 indexes wheel 6 one tooth counter-clockwise. This rotation is transmitted through helical gear 8, rigidly attached to ratchet wheel 6, and helical gear 4 which is keyed to the shaft of core c of cam member 2. This indexes the cam to next insert b so that in the next stroke of slide 1, roller 5 rolls a long cam insert b which may impart a different stroke to follower 3. Thus, each succeeding movement of the follower is varied until the cam member has been indexed one revolution and roll 5 is again in line with insert a. After this the cycle is repeated.
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