Power Tool Sensor Alignment Using Reference Markings
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Solution Overview
Problem
Existing machine tools face challenges in accurately aligning and displaying the workpiece contact area due to dependence on camera orientation, leading to suboptimal image alignment with other machine components.
Innovation Solution
The implementation of a tool sensor system that detects reference markings, such as patterns or QR codes, to correct tool sensor signals, ensuring optimal alignment of the workpiece contact area image with other machine components, using an evaluation device to determine correction values and adjust the image output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a camera is used as a tool sensor to display the workpiece contact area, then the operator can visualize the machining area, but the image alignment becomes highly dependent on camera orientation and assembly tolerances
Solution Approach 1:
The patent replaces the mechanical alignment approach (physically aligning camera with workpiece contact area) with an optical/image processing approach. The evaluation device detects reference markings in the captured image and calculates correction values to realign the displayed image, substituting mechanical precision requirements with computational image processing.
Solution Approach 2:
The patent changes the parameter being controlled from physical camera orientation to digital image orientation. Instead of adjusting the camera's physical angle to achieve alignment, the system captures the image and applies rotational correction values to the displayed image, transforming a mechanical alignment problem into a digital parameter adjustment problem.
2Manufacturing precision
If the camera orientation is fixed to achieve proper image alignment, then assembly precision is improved, but the system becomes more sensitive to orientation variations and assembly tolerances
Solution Approach 1:
The system performs self-alignment by automatically detecting reference markings in the captured image and computing correction values. The evaluation device autonomously adjusts the displayed image orientation based on detected reference marking positions, eliminating the need for precise manual assembly and making the system self-correcting against orientation variations.
Solution Approach 2:
The system implements a feedback mechanism where the captured image is analyzed to detect reference markings, and the detected positions feed back into calculating correction values that realign the displayed image. This closed-loop feedback compensates for orientation variations and assembly tolerances automatically.
Data Source
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AI summary
The invention relates to a mobile power tool (10), more particularly a hand power tool or semi-stationary power tool, for machining a workpiece (W), the power tool (10) having an in particular plate-type guide element (30) with a guide surface (32) for guiding the power tool (10) on the workpiece (W), or for guiding the workpiece (W) on the power tool (10). The power tool (10) has: a drive unit (11), comprising a drive motor (13) for driving a tool holder (14) that is located on the drive unit (11) and holds a work tool (15); said power tool (10) has a tool sensor (61, 62), the sensing range (EB1, EB2) of which is directed towards at least one portion of the power tool (10); and the power tool (10) has an evaluation device (80) for evaluating a tool sensor signal generated by the tool sensor (61, 62). According to the invention, a reference marking (R1, R2), which can be sensed by the tool sensor (61, 62), is provided in the sensing range (EB1, EB2) of the tool sensor (61, 62) and the evaluation device (80) is designed to determine at least one correction value for the tool sensor signal, in accordance with the reference marking (R1, R2).