Tool failure detection apparatus

Details Tool failure detection apparatus Tool failure detection apparatus

1985-08-09

1987-05-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

408 16, G01N 2186

Patent

active

046671137

ABSTRACT:
In a tool failure detection apparatus for a working machine such as a drilling machine for circuit boards, light is irradiated onto a workable area of a workpiece, and reflection light from the workable area is picked up by an imaging unit to produce a video signal. A video signal indicative of at least either one of a tool image and a worked void image which is picked up within a predetermined region of a picture is sampled to calculate an image area. A comparator compares a calculated image area with a preset reference value indicative of normality of the tool to judge whether the tool is normal or broken.

REFERENCES:
patent: 3367294 (1968-02-01), Ellison et al.
patent: 3912925 (1975-10-01), Gaskell
patent: 4502823 (1985-03-01), Wronski et al.

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