Cam 1 turns about fixed axis A and has four profiled grooves a. Symmetrically located followers 2 slide in fixed guides B and carry pins b which slide along grooves a. When cam 1 is turned through a certain angle, followers 2 slide along their axes. Positive motion is achieved because the diameter of pins b equals the width of grooves a. The mechanism is used for indexing and locking the followers in their extreme positions.
$3071$SmC,ML$