DISPOSITIF D'AVANCE PAS A PAS

摘要

Stepping device for a comptometer provided with a ratchet wheel and a pawl. An oscillating or reciprocating movement of the pawl is changed to a unidirectional rotary movement of the ratchet wheel. The pawl is forked or bifurcated to form shanks on diametrical opposite sides of the ratchet wheel, which shanks are each provided with a projection cooperating with the teeth of the ratchet wheel. A least one of the shanks is provided with another projection situated at a circumferential distance from the projection on the same shank which is greater than the gear pitch of the ratchet wheel and so chosen that when the two projections of the said shank are in contact with the sides or flanks of two teeth of the ratchet wheel then the resultant force of the forces acting at these sides is directed through the rotary axis of the ratchet wheel.