Patent ID: 6857939
Filing Date: 2005-02-22
Classification: B23D,B28D,F16P,Y10S,Y10T

Abstract:
1. A dicing machine which processes a work with a rotary blade, the dicing machine comprising: a spindle on which the rotary blade is attached and which is rotated by a spindle rotating motor; a turnable cover which covers the rotary blade during processing of the work, the turnable cover being turned about a turning axis from a closing position to an opening position when replacing the rotary blade, the turnable cover being returned from the opening position to the closing position in order to resume the processing, said turning axis being substantially parallel to the spindle; a blade breakage detector which is operable for detecting breakage of the rotary blade, the blade breakage detector being arranged on the turnable cover for turning therewith; and an interlock device which is operable for issuing an operation initiating command to a motor driving and controlling device to drive the spindle rotating motor which rotates the spindle to which the rotary blade is attached and for preventing the processing of the work when the following conditions are present: wherein the blade breakage detector is an optical detector including a light projection part and a light receiving part arranged to face each other across the edge of the blade, wherein the interlock device is controlled by a signal received from the blade breakage detector, wherein the signal from the blade breakage detector is generated for preventing the processing when the turnable cover is in the opening position or when the rotary blade is detached, and the signal from the blade breakage detector is generated for resuming the processing when the turnable cover is in the closing position and when the rotary blade is attached to the spindle.