Dust collector

• US 7,966,691 B2
• Filed: 01/19/2007
• Issued: 06/28/2011
• Est. Priority Date: 01/20/2006
• Status: Expired due to Fees

• Current Assignee: Hitachi KOKI Company Limited (Koki Holdings Co., Ltd.)
• Original Assignee: Hitachi KOKI Company Limited (Koki Holdings Co., Ltd.)
• Inventors: Takahashi, Kumio, Hayama, Yoshimasa, Inaniwa, Masahiro, Kakegawa, Daisuke
• Primary Examiner(s): NGUYEN, DUNG V
• Application Number:
  US12/160,494
• Publication Number:
  US 20100154161A1
• Time in Patent Office: 1,621 Days
• Field of Search: 153/39, 153/47, 153/52, 552/83, 55D/IG.3, 55D/IG.34
• US Class Current: 15/339
• CPC Class Codes: A47L 9/19 Means for monitoring filtering operation
• CPC Class Codes: A47L 9/20 Means for cleaning filters
• CPC Class Codes: A47L 9/2805 Parameters or conditions being sensed
• CPC Class Codes: A47L 9/2821 Pressure, vacuum level or airflow
• CPC Class Codes: A47L 9/2842 Suction motors or blowers
• CPC Class Codes: A47L 9/2857 User input or output elements for control, e.g. buttons, switches or displays
• CPC Class Codes: B23Q 11/0046 by sucking
• CPC Class Codes: B23Q 17/00 Arrangements for observing, indicating or measuring on machine tools for automatic control or regulation of feed movement, cutting velocity or position of tool or work B23Q15/00

Abstract

To provide a dust collector which, even when it is used in a poor power supply situation, can detect the dust loading of a filter accurately, can remove dust automatically and can reduce power consumption. In the dust collector, there is provided a control circuit which can detect the dust loading of a filter by comparing the threshold value of the dust loading pressure to be determined by the internal pressure of the filter, the operation of a suction device, the power supply frequency of the suction device and the supply voltage of the suction device with the filter internal pressure just before the suction device stops, and, when the filter is dust loaded, can operate a dust removing device.

Claims

1. 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.

2. A dust collector as set forth in claim 1, wherein the dust removing means is allowed to stop after it operates for a given time.