Electric power tool with optimized operating range
First Claim
1. An electric power tool, having an electric motor (8) acting to drive a tool (6) and having a sensor unit (9), which detects the contact pressure of the tool (6) against a workpiece (7) and cooperates with a signal transducer (10), wherein the sensor unit (9) has a current-measuring device (23), which detects the current of the electric motor (8), and wherein the sensor unit (9) further has a strain gauge and/or a piezoelectric sensor.
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Accused Products
Abstract
The invention relates to an electric power tool (1), having an electric motor (8) that serves to drive a tool (6). The electric power tool (1) is characterized in that a sensor unit (9) that detects the contact pressure of the tool (6) against a workpiece (7) cooperates with a signal transducer (10).
58 Citations
16 Claims
- 1. An electric power tool, having an electric motor (8) acting to drive a tool (6) and having a sensor unit (9), which detects the contact pressure of the tool (6) against a workpiece (7) and cooperates with a signal transducer (10), wherein the sensor unit (9) has a current-measuring device (23), which detects the current of the electric motor (8), and wherein the sensor unit (9) further has a strain gauge and/or a piezoelectric sensor.
- 9. An electric power tool, having an electric motor (8) acting to drive a tool (6), having a control and/or regulating unit (20) serving to guide the operation of the electric motor (8) and having a sensor unit (9), which detects the contact pressure of the tool (6) against a workpiece (7) and cooperates with the control and/or regulating unit (20), wherein the sensor unit (9) has a strain gauge and/or a piezoelectric sensor, and wherein the sensor unit (9) further has a current-measuring device (23), which detects the current of the electric motor (8).
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15. A method for guiding the operation of an electric power tool that has an electric motor (8) acting to drive a tool (6), a sensor unit (9), and a signal transducer (10), comprising the following steps:
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detecting the current of the electric motor (8) with a current-measuring device (23); determining the contact pressure of the tool (6) against a workpiece (7) by means of the sensor unit (9); sending a feedback to a user as to whether the user is exerting the contact pressure in an optimized operating range via the signal transducer (10); automatically adjusting a torque and/or a rotary speed of the electric motor.
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16. A method for guiding the operation of an electric power tool that has an electric motor (8) acting to drive a tool (6), a sensor unit, (9) and a control and/or regulating unit (20), comprising the following steps:
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detecting the current of the electric motor (8) with a current-measuring device (23); determining the contact pressure of the tool (6) against a workpiece (7) by means of the sensor unit (9); relating the contact pressure with optimized work parameters of the electric motor (8) stored in a memory of the control and/or regulating unit (20); automatically adjusting the torque of the electric motor (8), of a tool (6), and/or of a tool receptacle (6′
), as a function of the contact pressure, taking a predetermined rotary speed into account, wherein the predetermined rotary speed is set by a user at the onset of a work process and is kept constant.
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Specification