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Power tool with ultrasonic sensor for sensing contact between implement and object

A power tool and ultrasonic technology, which is applied in the direction of manufacturing tools, wood processing appliances, woodworking safety devices, etc., can solve the problem that electrical signals cannot be contacted and differentiated.

Active Publication Date: 2019-10-11
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, some workpieces, such as wood with high moisture exposure, can generate electrical signals that cannot be distinguished from contact with an operator
Furthermore, prior art detection systems require physical contact between the operator and the blade 22 before the system activates the brake or blade lowering mechanism.

Method used

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  • Power tool with ultrasonic sensor for sensing contact between implement and object
  • Power tool with ultrasonic sensor for sensing contact between implement and object
  • Power tool with ultrasonic sensor for sensing contact between implement and object

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Embodiment Construction

[0017] For the purpose of promoting an understanding of the principles of the embodiments described herein, reference is now made to the accompanying drawings and description in the following written specification. These references are not intended to limit the scope of the subject matter. This patent also covers any changes and modifications to the illustrated embodiments and further applications of the principles of the described embodiments that would normally occur to a person skilled in the art to which this document pertains.

[0018] 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, joiners , nailers, san...

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PUM

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Abstract

A power tool (200) includes a moving implement (222) and an ultrasonic transducer (226) that emits ultrasonic signals and receives echo return signals from an object (224, 229) that reflects the ultrasonic signals. A controller (240) identifies a distance between the implement and the object and identifies a type of the object based on the echo return signals from the object. The controller activates an implement arrest mechanism (236) in response to the distance between the object and the ultrasonic transducer being less than a predetermined threshold and the type of the object corresponding to a portion of a human body.

Description

[0001] This application claims priority to Indian Provisional Application No. 6071 / CHE / 2013, filed on December 24, 2013 and entitled "Power tool with ultrasonic sensor for sensing contact between an appliance and an object", which The entire contents are incorporated herein by reference. technical field [0002] The present disclosure relates generally to power tools, and more particularly to systems and methods for detecting contact between a person and a moving implement in a power tool. Background technique [0003] Detection or sensing systems have been developed for use in a variety of manufacturing equipment and power tools. Such a detection system is operable to trigger the reaction means by detecting or sensing the proximity or contact of certain limbs of the operator with certain parts of the equipment. For example, existing capacitive touch sensing systems in table saws detect contact between the operator and the saw blade. [0004] figure 1 A prior art detectio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q11/00F16P3/14B27G19/00
Inventor B.M.拉马斯瓦米V.马内瓦塞斯里坎蒂亚N.S.克里什纳劳
Owner ROBERT BOSCH GMBH