Machining device equipped with blade inspecting means

摘要

A machining device equipped with a rotating machining tool having a blade. A blade inspecting means is provided in the machining device. The blade inspecting means comprises an emission means for emitting electromagnetic radiation and a receiving means for receiving the electromagnetic radiation emitted by the emitting means and producing a signal corresponding to the received electromagnetic radiation. The emitting means and receiving means are disposed such that the electromagnetic radiation emitted from the emitting means undergoes interference by the blade of the machining tool and the electromagnetic radiation received by the receiving means varies according to a variation in the condition of the blade.