When driving pin wheel 1 turns through the angle ψ about fixed axis A, driven sprocket 2 with twenty teeth is turned through two divisions, i.e. through 1/10 revolution about fixed axis B. Every other tooth, b, of sprocket 2 is cut off to one half of the face width of the other teeth e. The first half of the rotation of wheel 2 is accomplished by the engagement of pin a with a short tooth b, and the other half of the rotation by the engagement of slot d in pin wheel 1 with a long tooth e. Unintentional rotation of sprocket 2 during its dwell periods is prevented by the engagement of the concentric outer surface of wheel 1 and two adjacent long teeth e.
$2605$PG,D$