Machine Tool Blade Positioning via Sensor Detection

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Solution Overview

Problem

Existing machine tools with movable working blades are immobilized in their operating position when switched off, making it difficult to reset them comfortably for operation.

Innovation Solution

A sensor arrangement using magnetic, inductive, capacitive, optical, and mechanical sensors detects the operating position of the working blade and moves it to a designated stop position when the machine tool is switched off, ensuring safe and reliable immobilization, allowing for easy restart.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the working blade is immobilized in the operating position when the machine tool is switched off, then the cutting or separating teeth remain in position for operation, but the distance between the cutting or separating teeth becomes too low to enable comfortable restart and the machine tool cannot be protected during transport

Engineering Contradiction:

Improvesafe and reliable immobilization of working bladeVSAvoidcomfortable restart of machine tool

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The sensor arrangement detects the operating position of the working blade before shutdown and automatically moves it to a predetermined stop position where the cutting or separating teeth are spaced apart. This preliminary positioning action ensures both safe immobilization during shutdown and comfortable restart capability, as the teeth are already positioned to allow easy re-engagement.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If a sensor arrangement is added to detect the operating position and move the working blade to a stop position, then safe and reliable immobilization is achieved, but the device complexity increases

Engineering Contradiction:

Improvesafe and reliable immobilization of working bladeVSAvoidcomplexity of sensor arrangement and control system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical position detection and locking mechanisms with a sensor arrangement that uses magnetic, inductive, capacitive, optical, or mechanical sensors to detect the operating position. This substitution simplifies the overall system by using field-based or non-contact sensing rather than complex mechanical linkages and switches, reducing moving parts while achieving reliable position detection and control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables operationally safe and reliable immobilization of the working blade in a stop position, facilitating comfortable restart and protection during transport, while maintaining robustness and simplicity in design.

Implementation Method 1

the at least two sensors are Hall sensors

Methodology Applied

Scientific EffectHall effect: Hall Effect

Data Source

PatentEP2745676B1Machine tool with at least one work blade that can be driven to perform a reciprocating movement

Publication Date: 2017.10.25 ROBERT BOSCH GMBH

AI summary

The machine tool (100) has a work blade (140) that is configured for performing a reciprocating motion. A sensor arrangement (180) is configured to detect the displacement of the work blade of the detected operating position to an associated stop position during switching off of the work blade. The sensor arrangement is provided with magnetic, inductive, capacitive, optical and or mechanical sensor. The sensor is associated to a signal transmitter. An eccentric drive is provided for driving the working blade.