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System and method for identification of implement motion in a power tool

A technology for electric tools and instruments, which is applied in the system field of instrument movement, can solve the problems of increasing the complexity of the saw 1 and the unreliability of the sensing device.

Active Publication Date: 2015-07-29
ROBERT BOSCH TOOL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although external sensing devices can be used to determine the movement of the saw blade 22 even when the motor is disabled, such sensing devices can be unreliable and add complexity to the saw 1

Method used

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  • System and method for identification of implement motion in a power tool
  • System and method for identification of implement motion in a power tool
  • System and method for identification of implement motion in a power tool

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Embodiment Construction

[0021] For the purpose of promoting an understanding of the principles of the embodiments described herein, reference is now made to the drawings and description in the following written specification. These references are not intended to limit the scope of the subject matter. This application also includes any changes and modifications to the illustrated embodiments and further applications of the principles of the described embodiments that would normally occur to one skilled in the art to which this document pertains.

[0022] As used herein, the term "power tool" refers to any tool having one or more moving parts moved by an actuator, such as an electric motor, internal combustion engine, hydraulic or pneumatic cylinder, and the like. Examples of power tools include, but are not limited to, miter saws, miter saws, table saws, circular saws, reciprocating saws, jigsaws, band saws, cold saws, cutters, impact drivers, angle grinders, drills, Jointers, nailers, sanders, trimm...

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PUM

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Abstract

A method of operating a power tool identifies motion of an implement in a power tool. The method includes obtaining a plurality of samples of an electrical signal that passes through the implement, identifying a parameter for the plurality of samples corresponding to a variation in values of predetermined groups of samples in the plurality of samples, updating a status for the implement with a first status indicating that the implement is not moving with reference to the identified parameter being less than a predetermined threshold, and updating a status for the implement with a second status indicating that the implement is moving with reference to the identified parameter being greater than the predetermined threshold.

Description

technical field [0001] The present invention relates generally to power tools and, more particularly, to systems and methods for detecting motion of an implement in a power tool. Background technique [0002] Detection or sensing systems have been developed for use with a variety of manufacturing equipment and power tools. Such a detection system is operable to trigger the reaction means by detecting or sensing proximity or contact between an operator's appendage and a portion of the device. For example, existing capacitive touch sensing systems in table saws detect contact between the operator and the saw blade. [0003] FIG. 1 shows a prior art detection system 90 based on capacitive sensing in combination with a table saw 1 . The detection system 90 drives an excitation voltage electrically coupled to the moving blade 22 of the table saw 1 and senses the current drawn from the blade 22 . The magnitude or phase of the sensed current and / or excitation voltage changes whe...

Claims

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Application Information

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IPC IPC(8): G01P13/00B23Q11/00
CPCG01P13/00G05B19/406B23Q11/0082
Inventor S·Y·K·芒加普伦B·M·拉瓦斯瓦米N·S·克里希那拉奥V·M·斯里坎特亚
Owner ROBERT BOSCH TOOL
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