| 摘要 |
A contact detecting probe including a casing (1) and a movable arm-set (5), housed in the casing, with a support element (7), an arm (11) and a feeler (13), coupled to the arm and adapted for contacting a mechanical piece (15) to be checked. At least a light emitting diode (21) is fixed to the casing and directs a light beam, along a predetermined path, toward a corresponding photodiode (25) also fixed to the casing. The support element, axially biased by a spring (17), includes an annular rim (8) that, when the probe is in rest condition, contacts an internal surface (16) of the casing and interrupts the path of the light beam. The occurring of contact between the feeler and the mechanical piece is detected by the photodiode that, in consequence of the at least partial detaching of the annular rim and the internal surface of the casing, receives the light emitted by the associated emitter diode.
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