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Cam 1 rotates about fixed axis A. Follower 2 oscillates about fixed axis B and carries roller a which rolls a long the working surface of cam 1. Link 3 is connected by turning pairs C and D to follower 2 and secondary follower 4 which oscillates about fixed axis E. Link 5 is connected by turning pairs L and N to side cams 6 and 7 which turn about fixed axes K and F. The Iengths of the links comply with the conditions: K͞L=F͞N and K͞F=L͞N; figure KLNF is a parallelogram. When cam 1 rotates, motion is transmitted from roller a through links 3 and 4 to link 5. Attached to one end of link 5 is spring 13, and roller b rotates freely at the other end, rolling a long fiat surface c of link 4. Links 6 and 8, and 7 and 9 are mating side cams. As they turn with respect to each other, the cam surfaces slide along the mating surfaces, displacing bars 10 and 11 in fixed guides of base 12. When follower 2 is deflected the maximum amount to the right, bars 10 and 11 are displaced the maximum distance in the direction of the arrows. Springs 14 and 15 return bars 10 and 11 to their initial positions.