Tool failure detection apparatus
AssigneeHitachi Seiko Ltd.
InventorsKiyoharu Nakajima, Taisuke Ito, Yusui Nakamura
Life of this patent
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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.
Claims5
A tool failure detection apparatus for a working machine having a working tool movable relative to a workpiece, said detection apparatus comprising:
- means for irradiating light onto a surface of a working area of said work piece;
- means for receiving reflection light reflected from said workpiece and detecting at least either one of a worked void of said working area and said working tool;
- means for calculating an area of a detected image within a predetermined region;
- means for setting a reference value based on a particular area of the detected image obtained when said working tool is not broken;
- and
- means for comparing said reference value with the area calculated by said calculating means and judging whether or not said working tool is broken.
Dependencies are inferred from the claim text.