| 摘要 |
An automatically controlled apparatus whose operation is controlled at least in part by the input of a signal that an object is sensed in a selected positioned relative the apparatus, the apparatus having an emitter to emit electromagnetic radiation and a sensor to sense electromagnetic radiation emitted by the emitter which is reflected off an object suitably positioned relative the apparatus, the improvement comprising a carriage member mounted to the apparatus for relative pivoting about a pivot axis, the emitter and sensor carried by carriage member, the emitter being generally directional emitting radiation to emanate outwardly from the emitter generally along a longitudinal emission axis, the sensor being generally directional and sensing radiation which emanates generally along a longitudinal sensing axis terminating in the sensor, the emission axis and the sensing axis generally disposed in a common plane which includes the horizontal axis.
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