Hand-Held Saw Depth Control for Precise Cut Start and End Points
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Solution Overview
Problem
Operators face difficulties in accurately locating and maintaining the machining start and end points when using hand-held or semi-stationary machine tools, particularly with plunge saws, leading to challenges in introducing precise saw cuts on workpieces.
Innovation Solution
The machine tool incorporates a depth adjustment device that determines the distance of the machining edge from workpiece references, allowing for precise setting of depth values and adjustment positions, enabling accurate placement of the cutting tool relative to the workpiece surface, and includes a detection system for workpiece references to guide the cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an operator manually positions the plunge saw to find the machining start point, then the machine tool can be operated without additional devices, but the positioning precision and ease of operation deteriorate due to difficulty in locating exact start and end points
Solution Approach 1:
The patent replaces manual visual positioning with an optical detection system. The detection device uses optical fields to automatically detect workpiece references and determine machining start and end points, substituting the mechanical/visual positioning method with an optical measurement system that provides precise automatic positioning without requiring operator skill or experience.
2Productivity
If the work tool penetrates deeper into the workpiece to ensure complete cutting, then the cutting effectiveness improves, but the risk of cutting beyond intended boundaries increases
Solution Approach 1:
The patent implements a feedback control system where the detection device continuously monitors the position of the machining edge relative to workpiece references, and the depth adjustment device automatically adjusts the penetration depth based on this feedback. The system determines the actual distance of the machining edge from workpiece references and dynamically adjusts the depth to prevent over-cutting while ensuring complete cutting when needed.
Solution Approach 2:
The patent makes the penetration depth dynamic rather than fixed. The depth adjustment device can continuously modify the depth of the work tool during operation based on real-time position detection, allowing the system to adapt the cutting depth to the specific situation - penetrating deep enough for effective cutting when safe, and reducing depth when approaching boundaries.
3Manufacturing precision
If the machine tool includes automatic detection and depth adjustment systems, then the manufacturing precision improves, but the device complexity and initial cost increase
Solution Approach 1:
The patent designs the detection device and depth adjustment device to serve multiple functions. The detection device not only identifies the machining start point but also continuously monitors the machining edge position throughout the cutting process. The depth adjustment device both sets initial depth and dynamically adjusts depth during operation, providing multiple functions through integrated components rather than separate specialized devices for each function.
Data Source
AI summary
A mobile machine tool including a guide element, having a guide surface, for guiding the machine tool and a workpiece surface of the workpiece to one another along a machining path. The machine tool includes a drive unit having a drive motor for driving a tool receptacle arranged on the drive unit for receiving a work tool and a detection device for detecting at least one workpiece reference which is associated, with respect to a machining path, with a machining start point where the work tool starts the machining of the workpiece or with a machining end point where the work tool ends the machining of the workpiece. The tool receptacle is designed for rotationally driving the work tool about an axis of rotation and for adjusting a penetration depth of the work tool into the workpiece by means of a depth adjustment device between depth adjustment positions.