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cam timer
A cam timer is an electromechanical system for controlling a sequence of events automatically.
==Description==
An electric motor drives, through a reduction gearbox, a shaft on which is arranged a series of cams. Associated with each cam is one or more switches. The motor rotates at a fixed speed, and the camshaft follows, usually extremely slowly. Indentations or protrusions on the cams operate the switches at different times. By arrangement of the cams and switches, complex sequences of opening and closing switches can be made. The switches then operate different elements of the controlled system - for example motors, valves, etc.
Most cam timers use a miniature mains synchronous motor to rotate the mechanism at an accurate constant speed. Occasionally more complex timers with 2 motors are seen.
Cam timers are related to internal combustion engine camshafts, but instead of the cam physically pushing a valve, a cam timer switches signals, and the signals actually affect the physical changes. Also, in a camshaft, the cam rotation is synchronized to the engine configuration by the timing belt or timing gears.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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