Gear cutting – milling – or planing – Milling – With means to protect operative or machine
Patent
1981-12-21
1985-03-05
Briggs, William R.
Gear cutting, milling, or planing
Milling
With means to protect operative or machine
250221, 250561, 356375, 408 6, 408 11, 408 16, B23C 900, H01J 516, B23B 4724
Patent
active
045028230
ABSTRACT:
A Drill Bit detector for use with numerically controlled drilling machine capable of sensing missing or broken Drill Bits in the range of 1 mil to 30 mils in diameter, or larger, is described. An infrared emitting diode is driven at a predetermined frequency with the pulsed light being directed through fiber optic cable directed at a portion of the Drill Bit to be detected. A change of light intensity occurring when a Drill Bit is missing is detected and the pulsed light detected converted to a pulsating electrical signal at the input frequency of the pulse light source. A frequency responsive circuit converts the pulsating electrical circuit to a digital signal indicative of the absence of the sensed Drill Bit. A timer determines whether or not the sensed digital signal occurs for a predetermined threshold time period, and causes it to be ignored as spurious if less than the predetermined time interval, or causes the drilling machine operation to be halted if occurring longer than the threshold time period. Multiple detection circuits are illustrated for use with most multiple drill spindles.
REFERENCES:
patent: 3906232 (1975-09-01), Miehofer
patent: 3912925 (1975-10-01), Gaskell
patent: 4012635 (1977-03-01), Walter et al.
patent: 4019606 (1977-04-01), Caputo et al.
patent: 4029957 (1977-06-01), Betz et al.
patent: 4266124 (1981-05-01), Weber et al.
patent: 4272762 (1981-06-01), Geller et al.
patent: 4335316 (1982-06-01), Glanz et al.
patent: 4340326 (1982-07-01), Buonauro et al.
Albright John E.
Carlson Jeffrey J.
Wronski Steve
Briggs William R.
Grace Kenneth T.
Johnson Charles A.
Sperry Corporation
Truex Marshall M.
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