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单词 Stepping switch
释义

Stepping switch

英语百科

Stepping switch

An example of a Western Electric 7A Rotary (Bird-cage) Line Finder assembly. The horizontal shaft is driven by a gear and when the Line Finder's electromagnet is energized, a flexible disc at the base of the Line Finder's brush carriage is engaged through friction to the horizontal shaft's driving disc, causing the brush carriage to rotate.
An array of uniselector stepping switches as installed in a telephone exchange. The silver dials show the current position of the moving wipers. The fixed feeder brushes are barely visible.

In electrical controls, a stepping switch or uniselector (UK), also known as a stepping relay, is an electromechanical device which allows an input connection to be connected to one of a number of possible output connections, under the control of a series of electrical pulses.

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