| 摘要 |
A roller activated switch with an unlimited number of triggering points, a preferred embodiment featuring linear activation by a rod upon the roller. The switch unit receives a moveable member upon the roller in its housing. The moveable member rolls a spring-biased roller to an off center position, thus activating or deactivating contacts upon any movement of the moveable member beyond a small increment. The switch rapidly responds to any reversing movement of the moveable member upon the roller no matter what absolute position the moveable member is in, at the time, thus having an unlimited number of changeable triggering points independent of contact pressure and having an overtravel limited only by the length of the moveable member. This feature results in the switch having the ability to establish its own triggering points. Thus, absolute triggering becomes automatic.
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