Rigidly attached cams 1 and 6 rotate about fixed axis A. Follower 3 oscillates about fixed axis B and is rigidly attached by some clamping facility to crosspiece 5 which carries rollers 2 and 4. As shown, roller 2 rolls along the working surface of cam 6. Crosspiece 5 can be undamped, turned about axis D and reclamped so that roller 4 rolls along the working surface of cam 1, thereby changing the type of motion of follower 3.
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