Two cams, 1 and 5, with involute working surfaces, rotate about fixed axis A. The cams can be adjusted to different positions with respect to each other and clamped together. Follower 3 reciprocates in fixed guides B-B and carries four rollers 2 which roll along the contours of cams 1 and 5. Cam 5 displaces follower 3 to the right, and cam 1 to the left.
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