| 摘要 |
<p>A timing mechanism and method of delaying actuation of electrical switches which control functions of an appliance and that are responsive to a rotation of a cam. The mechanism comprises a cam rotatably carried on a shaft and providing a program and electrical switches opening and closing in response to the program . Rotatable first ratchet teeth of a first major diameter are carried on the shaft and coupled to the cam for intermittent rotation therewith. Rotatable second ratchet teeth are coupled to and in axial alignment with the first rotatable ratchet teeth and of a second major diameter which is less than the first major diameter. Rotatable third ratchet teeth are carried by the shaft in axial alignment with the first and second ratchet teeth and independently rotatable from the first and second ratchet teeth and have a third major diameter which is less than the first major diameter but greater than the second major diameter and further having at least one notch of sufficient depth to provide a minor diameter at least as small as a minor diameter of the second ratchet teeth. A drive pawl selectively engages the first and third rotatable ratchet teeth and the second ratchet teeth when engaged with the notch. The first and third ratchet teeth are engaged by individual stops.</p> |
