Conoid cam 2 can turn about fixed axis A-A and be displaced along this axis. Roller 4 of follower 1 rolls along cam 2. Follower 1 has slot a which slides along block b of member 5. Member 5 can slide in fixed guides B-B. Roller 6 of follower 1 rolls a long slot d of member 3 which can slide in fixed guide C. When conoid cam 2 is displaced a long axis A-A a distance proportional to independent variable x, and turned about axis A-A through an angle proportional to y, then the displacement of member 3 is proportional to z, i.e. z=z(x, y).
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