Follower 1 turns about fixed axis A and carries roller 5. Cam 3 slides along fixed guide 4 and its contour consists of two flat surfaces a and b. When cam 3 travels from its extreme right-hand position, roller 5 first rolls along surface a, turning follower 1 clockwise. Then it rolls along surface b and follower 1 turns counterclockwise. Roller 5 indexes cam 3 in its extreme positions. Roller 5 is held in contact with cam 3 by spring 2.
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