Handheld Saw Pre-Scoring Assembly for Clean Cuts and Safe Tool Change
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Solution Overview
Problem
Handheld machine saws often result in unclean cuts due to chips being torn out at the edge of the saw cut, and existing tool change mechanisms are not secure or reliable.
Innovation Solution
Incorporating a scoring assembly with a scorer toolholder and drive motor, along with a securing device that disables power to both the saw and scorer drive motors during tool change, and using blocking elements to securely position the toolholders for safe and reliable tool exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a saw blade is used to cut the workpiece, then the cutting operation can be performed, but chips are torn out at the edge resulting in unclean cuts
Solution Approach 1:
A scoring blade is positioned in front of the main saw blade to score the workpiece surface along the intended cut line before the main blade engages. This preliminary scoring creates a clean guide groove that prevents chip tearing and ensures clean edges during the subsequent cutting operation by the main saw blade.
2Ease of operation
If a tool change mechanism is provided for the saw blade, then tool changes can be made, but the mechanism is not secure or reliable
Solution Approach 1:
The scoring assembly and main saw blade assembly share a common securing device and tool holder mounting mechanism. The same securing device that holds the main saw blade also secures the scoring blade, creating a unified and reliable tool change system for both tools rather than separate mechanisms.
Solution Approach 2:
The tool holders for both the scoring blade and main saw blade are designed with self-securing features where the securing device automatically engages with the tool holder when inserted into the mounting location, providing reliable tool retention without requiring additional manual securing steps.
3Manufacturing precision
If a scoring assembly with separate drive motor is added, then cut quality is improved, but device complexity increases
Solution Approach 1:
The scoring assembly and main saw blade assembly share common components including the guide device, tool holder mounting mechanism, and securing device. This merging of components reduces overall device complexity despite adding the scoring function, as both tools utilize the same structural framework rather than requiring completely separate systems.
Data Source
AI summary
A portable handheld machine saw having a saw assembly (11) which has a saw tool receptacle (14) for a saw tool (15) and a saw drive motor (12) for driving the saw tool receptacle (14), and having a guide device (17) which has a guide body (18) having a guide surface (19) extending along a longitudinal axis (L) for guiding the handheld machine saw (10) in a working direction (AR) on a workpiece (W). The handheld machine saw (10) has a pre-scoring assembly (31), arranged in front of the saw assembly (11) on the guide device (17) in relation to the working direction (AR), having a pre-scoring tool receptacle (34) for a pre-scoring tool (35), and having a pre-scoring drive (32A), for driving the pre-scoring tool receptacle (34), wherein, on the basis of the pre-scoring tool (35) protruding in front of the guide surface (19) during pre-scoring operation of the handheld machine tool, a score (RI) can be introduced into the workpiece (W), in the working direction (AR), in front of the saw cut (SAE) to be introduced.