Patent ID: 7966691

Claim:
A dust collector, comprising: a tank including a suction opening for storing dust therein; a suction device for sucking in dust; a filter device for catching dust; and, a dust removing device for removing dust stuck to the filter device: pressure detect means for detecting the internal pressure of the filter device; suction device operation detect means for detecting the operation of the suction device; frequency detect means for detecting the power supply frequency of the suction device; supply voltage detect means for detecting the supply voltage of the suction device; means for comparing the signal of the pressure detect means just before stop of the suction device with a preset dust loading pressure threshold value determined by the suction device operation detect device just before the suction device, the frequency detect means and the supply voltage detect means are stopped; and, a control circuit, when the suction device operation detect means detects the stop of the suction device, for driving the comparing means to compare the signal of the pressure detect means just before stop of the suction device with the dust loading pressure threshold value so as to detect the dust loading of the filter and, when the filter is detected to be in the dust loaded state, for driving the dust removing device.