Cam 1 rotates about fixed axis A and its globoidal surface, in which helical cam groove a is machined, is generated by the revolution of a circular arc of radius R about axis A. Follower 2 oscillates about fixed axis B and has handle 5. Pin 3 slides along groove a and is connected by turning pair C to latch 6 which turns about axisD of follower 2. Pin 3 passes with some clearance through hole d in handl ed. When cam 1 rotates, first in one direction and then in the other, follower 2 oscillates about axis B. The follower can be disengaged by pressing latch 6 to wi thdraw pin 3 from engagement with groove a. When latch 6 is released, flat spring 4 holds pin3 inengagement with groove a.
$3101$SmC,SE$