Pivoting Scoring Assembly for Cleaner Handheld Saw Cuts
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Solution Overview
Problem
Handheld machine saws often result in unclean cuts due to chips being torn out from the workpiece edge during the sawing process, leading to inefficiencies and poor surface quality.
Innovation Solution
Incorporating a scoring assembly with a scorer toolholder and drive, separate from the saw assembly, to introduce a score on the workpiece surface before cutting, aligning with the saw cut and reducing the risk of chip tearing by allowing precise control over the penetration depth and alignment of the saw tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a saw blade cuts into the workpiece from the lower side, then the saw cut can be introduced efficiently, but chips are torn out from the workpiece edge resulting in unclean cuts
Solution Approach 1:
The scoring tool performs a preliminary action by introducing a score into the workpiece surface before the saw blade makes the cut. This pre-cut groove guides the saw blade and prevents chips from tearing out at the edges, thereby resolving the contradiction between efficient sawing and clean cuts
2Manufacturing precision
If a scoring assembly is added to introduce a score before cutting, then cut cleanliness is improved, but device complexity increases
Solution Approach 1:
The scoring assembly is merged with the saw assembly into a single integrated handheld machine saw. The scoring toolholder and saw toolholder are combined on the same device, allowing both functions to be performed without requiring separate tools, thus improving cut cleanliness while minimizing the increase in device complexity
3Adaptability or versatility
If the scoring tool and saw tool are mounted on separate toolholders with independent depth setting, then adjustment flexibility is improved, but device complexity increases
Solution Approach 1:
The device is segmented into separate toolholders (scoring toolholder and saw toolholder) with independent depth setting bearings. This allows each tool to be adjusted independently to the required depth, providing flexibility for different workpiece materials and cut requirements while maintaining manageable device complexity through modular design
Data Source
AI summary
A mobile handheld machine saw (10) having a saw assembly (11), which has a saw toolholder (14) for a saw tool (15), in particular a saw blade, and a saw drive motor (12) for driving the saw toolholder (14), and having a guide device (17), which has a guide body (18) having a guide surface (19) for guiding the handheld machine saw (10) along a working direction (AR) on a workpiece (W) and on its upper side (19A) opposite to the guide surface (19), the saw toolholder (14) is movably mounted by means of a saw depth setting bearing (16) between an upper depth setting position (UT) in which the saw toolholder (14) is adjusted closer to the guide surface (19) than in the upper depth setting position (OT).