Hand-Held Power Tool Shadow Alignment for Precise Miter Cuts
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Solution Overview
Problem
Hand-held power tools, such as circular saws, face challenges in accurately setting a miter cut angle on workpieces due to laborious and imprecise alignment procedures.
Innovation Solution
The cutting tool is positioned in the light path of a light cone to generate a cast shadow on the workpiece's end face, allowing for precise alignment and locking into a desired cutting position, ensuring accurate miter cuts by projecting a shadow that marks the cutting plane and path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual alignment procedures are used to set miter cut angle, then the power tool can be operated without additional components, but the alignment is laborious and imprecise
Solution Approach 1:
An illumination arrangement is introduced as an intermediary element between the cutting tool and the workpiece. This arrangement projects a light cone that creates a visible cast shadow on the workpiece surface, serving as a mediator to indicate the cutting path and enable precise alignment without direct manual measurement
Solution Approach 2:
The illumination arrangement creates an optical copy (cast shadow) of the cutting tool's position and orientation on the workpiece. This shadow copy provides visual feedback for alignment, allowing the operator to precisely match the cutting path with the desired cut line without directly measuring the tool angles
2Manufacturing precision
If manual alignment procedures are used to set miter cut angle, then the device structure remains simple, but the cutting position cannot be set exactly
Solution Approach 1:
The illumination arrangement acts as a mediator that projects visual information about the cutting tool's position onto the workpiece. The cast shadow provides an intermediate visual reference that enables precise positioning of the cutting tool relative to the workpiece features, achieving accurate cutting positions without complex mechanical positioning mechanisms
Solution Approach 2:
The optical illumination and shadow projection system replaces mechanical alignment mechanisms such as physical gauges, protractors, or complex adjustment devices. By using light to indicate cutting position and path, the system achieves precise cutting positioning without requiring elaborate mechanical alignment apparatus
3Length of moving object
If the cutting tool projects beyond the bearing surface, then the cutting depth is sufficient, but the alignment reference is difficult to establish
Solution Approach 1:
The illumination arrangement positioned behind the cutting tool projects light through the cutting tool onto the workpiece, creating a cast shadow that serves as a visual mediator. This shadow provides an alignment reference on the workpiece surface that is independent of the cutting tool's projection depth, making alignment detection easy regardless of how far the tool projects beyond the bearing surface
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
This method enables easy and precise alignment of the power tool with markings on the workpiece, improving the accuracy and ease of making miter cuts by clearly indicating the cutting area and path.
Implementation Method 1
an illumination arrangement is allocated to the cutting tool, which illumination arrangement emits a light cone onto the cutting tool in the direction of travel of the power tool to generate a cast shadow of the cutting tool on the workpiece
Data Source
AI summary
A hand-held power tool includes a guide plate including a bearing surface and a top face. A drive assembly includes a drive motor supported above the top face and configured to drive a cutting tool. An illumination arrangement is configured to emit a light cone onto the cutting tool in a direction of travel of the power tool. When the cutting tool is in a locked cutting position in which the drive assembly is locked in position with respect to the guide plate and the cutting tool projects beyond the bearing surface, the cutting tool is disposed in a light path of the light cone to generate a cast shadow of the cutting tool on an end face of the workpiece to be cut, which end face faces the cutting tool and is oriented transversely to the bearing surface of the guide plate.