Electric power tool with a clamping device detecting its opening width

The opening width (S) of the tool chuck (1) is detected by a sensor (5), when the tool is stationary, to allow the size of the inserted drill bit to be calculated and used for controlling the rotation rate of the electric motor. Pref. the sensor provides a voltage signal during cut-out of the electr...

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Bibliographische Detailangaben
Hauptverfasser:	PFAUNDLER, JULIAN., LEITENBERGER, THOMAS. (BA), HIRSCHBURGER, WOLFGANG, SEEL, OTTMAR
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS BORING COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING MACHINE TOOLS MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS MEASURING MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS PHYSICS SIGNALLING TARIFF METERING APPARATUS TESTING TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILARSIGNALS TRANSPORTING TURNING
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Beschreibung
Zusammenfassung:	The opening width (S) of the tool chuck (1) is detected by a sensor (5), when the tool is stationary, to allow the size of the inserted drill bit to be calculated and used for controlling the rotation rate of the electric motor. Pref. the sensor provides a voltage signal during cut-out of the electric motor which is proportional to the tool chuck opening width. A Hall sensor or magnetoresistive sensor can be used, cooperating with a sliding magnetic ring, or soft iron cylinder (6), adopting a position dependent on the chuck opening width.