| 摘要 |
A timer includes a disc-type of cam having circular cam tracks thereon for coaction with switches, all carried by the housing. A motor is mounted on the housing and has an eccentric that acts through a drive pawl, a stop pawl or preferably two stop pawls precluding reverse cam rotation, there being a series of peripheral teeth on the cam on which the pawls act, the teeth having a variable pitch produced by their being of non-uniform angular size.
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