Claims
- 1. A control module for an electrically power hand tool having a rotary member; comprising:
a speed adjustment circuit; a speed sensor operable to sense a rotary speed of the rotary member; and a controller responsive to the speed adjustment circuit to set a speed target and operably configured to command the rotary member in response to a comparison of the sensed rotary speed and the speed target.
- 2. The control module of claim 1, wherein the speed sensor comprises a noncontact transducer.
- 3. The control module of claim 1, wherein the rotary member includes magnetic poles, the speed sensor comprises an inductive pickup operable to sense the magnetic poles on the rotary member.
- 4. The control module of claim 1, further comprising:
a mechanical control for receiving a user input for operating the hand tool; and a thin film switch in physical communication with the mechanical control and in electrical communication with the controller.
- 5. A method of controlling a electrically powered rotary member of a hand tool, comprising:
in respone to receiving a user command, accelerating the rotary member; sensing a rotary speed of the rotary member; decelerating the rotary member in response the rotary speed of the rotary member exceeding a speed target.
- 6. The method of claim 5, wherein the hand tool comprises a fastener driving tool having a safety switch and a trigger switch, the receiving a user command comprises:
receiving a safety signal from the safety switch indicating a nose assembly of the tool is against a workpiece; accessing a safety time-out value; timing a duration of depression of the safety signal; activating the tool to drive a fastener in response to receiving a trigger signal from the trigger switch before the timed duration of the safety signal exceeds the safety time-out value.
- 7. A portable hand tool, comprising:
an electric motor; a rotary member turned by the electric motor; a speed adjustment circuit; a speed sensor operable to sense a rotary speed of the rotary member; and a controller responsive to the speed adjustment circuit to set a speed target and operably configured to command electric motor to turn the rotary member in response to a comparison of the sensed rotary speed and the speed target.
- 8. An electric powered hand tool, comprising:
an electric motive device; at least one mechanical control positioned by a user; a controller operably configured to command the electric motive device in response to an electrical command; and a thin film switch in mechanical communication with the mechanical control and in electrical communication with the controller and operable to provide an electrical command in response to positioning of the mechanical control.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the priority of Provisional Patent Applicant serial No. 60/258,022, filed on Dec. 22, 2000 and incorporates herein, by reference, the totality of the invention disclosure therein.
Provisional Applications (1)
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Number |
Date |
Country |
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60258022 |
Dec 2000 |
US |