Mobile Machine Tool Sensor Layout for Workpiece Contact Detection
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Solution Overview
Problem
Existing machine tools lack optimal monitoring of the workpiece contact area, particularly when the working tool partially covers the detection areas of tool sensors, leading to suboptimal visibility and detection of the workpiece contact zones.
Innovation Solution
The machine tool employs at least two tool sensors positioned on opposite sides of the working tool, with a section of the working tool engaging in the workpiece, allowing each sensor to detect partial contact areas optimally. Additional features include adjustable tool holder settings, illumination devices for improved visibility, and a switching mechanism to prioritize sensor signals based on operational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single tool sensor is used to detect the workpiece contact area, then the device complexity is low, but the measurement precision and coverage of the workpiece contact area are insufficient when the working tool partially covers the detection area
Solution Approach 1:
The detection task is segmented by dividing the workpiece contact area into multiple sub-areas, with each tool sensor responsible for detecting a specific sub-area. This segmentation allows comprehensive coverage of the entire contact area including regions partially obscured by the working tool, thereby improving measurement precision without requiring a single complex sensor
Solution Approach 2:
Multiple tool sensors are merged into a coordinated detection system where each sensor detects a specific workpiece contact sub-area. The signals from all sensors are combined to provide complete monitoring of the workpiece contact area, resolving the contradiction between using multiple sensors and maintaining simple device complexity
2Measurement precision
If tool sensors are positioned to detect the entire workpiece contact area, then the measurement precision is high, but the working tool cannot engage properly in the workpiece
Solution Approach 1:
The detection area is segmented and assigned to different sensors positioned on opposite sides of the working tool. This allows the working tool to engage freely in the workpiece while each sensor monitors its designated sub-area, achieving both complete detection coverage and proper tool engagement
Solution Approach 2:
The detection system transitions from a single-dimensional detection approach to a multi-dimensional arrangement with sensors positioned on opposite sides of the working tool. This spatial distribution allows the working tool to engage in the workpiece while sensors on both sides detect their respective contact sub-areas simultaneously
3Productivity
If the working tool is positioned to engage in the workpiece, then the machining operation is effective, but the detection area of one sensor is covered by the working tool
Solution Approach 1:
The workpiece contact area is segmented into multiple sub-areas, with each sub-area assigned to a specific tool sensor. This segmentation ensures that when the working tool engages in the workpiece for effective machining, each sensor can still detect its designated sub-area without interference, preventing information loss
Solution Approach 2:
Multiple tool sensors create redundant detection capabilities for different portions of the workpiece contact area. This copying approach ensures that even when one sensor's detection area is partially covered by the working tool during machining, the complete contact area information is still captured by the other sensors
Data Source
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AI summary
The invention relates to a mobile machine tool, namely a hand-held machine tool (10) or a semi-stationary machine tool, for machining a workpiece (W), wherein the machine tool (10) comprises a particularly plate-like guide element (30) having a guide surface (32) for guiding the machine tool (10) on the workpiece (W) or guiding the workpiece on the machine tool (10), wherein the machine tool (10) has a drive unit (11) with a drive motor (13) for driving a tool receiving portion (14) that is arranged on the drive unit (11), wherein the machine tool (10) comprises a tool sensor arrangement (61, 62) for detecting a workpiece contact region, in which a working tool (15), in particular a separating tool, which is arranged on the tool receiving portion (14), is in contact with the workpiece (W) and in particular cuts into the workpiece (W). It is provided that the tool sensor arrangement (61, 62) comprises at least two tool sensors (61, 62), the detection regions (EB1, EB2) of which being assigned to different workpiece contact partial regions (WK1, WK2) of the workpiece contact region.