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Cylinder cam 1 rotates about fixed axis A-A and the theoretical, or pitch, curve of its groove aabb has point d of self-intersection. Follower 2 reciprocates in fixed guides B-B and carries roller 3 which rolls and slides along groove aabb. As roller 3 passes along portions aa and bb of the groove, follower 2 travels to the right and to the left. As it passes along portions ab and ba, follower 2 has long dwells corresponding to an angle ϕ of cam rotation equal to 180°. A full cycle corresponds to two revolutions of cam 1. The axis of follower motion is parallel to axis A-A.