Abrading – Precision device or process - or with condition responsive... – Computer controlled
Patent
1994-06-27
1995-07-18
Rachuba, Maurina T.
Abrading
Precision device or process - or with condition responsive...
Computer controlled
451 6, 451 8, 83 62, B24R 4900
Patent
active
054336490
ABSTRACT:
The front end portion of a rotational blade is accurately located in a non-contact manner although the quantity of wear of the blade has been changed. The structure is so arranged that a pair of prisms are disposed to oppose each other at a predetermined interval, either of the two prisms converges light beams emitted from a light emitting diode within a predetermined interval, and the residual prism again converges the light beams which have been diffused after they have been converged. A photodiode receives beams converged by the other prism. The disturbance light and noise are eliminated by an amplifier so as to fetch only light emitted from the light emitting diode. A blade shields light beams converged at the central portion located at a predetermined interval, while reading devices read the quantity of light received by the photodiode and as well as read the displacement of the blade. A comparator transmits a signal when the quantity of light received by said photodiode agrees with a predetermined value which has been previously stored, so that the front position of the blade is located to correspond to the wear and the like. Additionally, the opposed surfaces of the prisms are kept clean of mist and cutting dust during processing by the jetting of air across them.
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Rachuba Maurina T.
Safran David S.
Tokyo Seimitsu Co. Ltd.
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