Eccentric 1 rotates about fixed axis B-B and slides along this axis on a feather key of shaft 4. Eccentric 2 rotates about fixed axis A and moves eccentric 1 along shaft 4. In a definite position of eccentric 1 its pin a engages the slot of a Geneva wheel (not shown) and stops the wheel. Eccentric 1 is held against eccentric 2 by spring 3.
$3373$SmF,ML$