Jigsaw Blade Dual Tooth Rows for Clean Cutting
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Solution Overview
Problem
Existing jigsaw blades with set pre-cutting teeth often result in a wide cut and poor surface quality due to workpiece splinters being torn out during sawing, leading to a compromised cutting performance and surface finish.
Innovation Solution
A jigsaw blade design featuring two rows of saw teeth angled relative to each other and the cutting direction, with one row having a larger clearance angle and roof serrations to prevent surface tearing, ensuring both rows contribute to cutting performance throughout the process without set teeth, resulting in a clean and efficient cut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If set pre-cutting teeth are used to prevent edge splintering, then surface quality improves, but the cut width increases and workpiece splinters are torn out during sawing
Solution Approach 1:
The saw blade is divided into two distinct rows of teeth: pre-cutting teeth at the leading edge and main cutting teeth behind them. Each row performs a specific function - the pre-cutting teeth create a guide groove and prevent edge splintering, while the main cutting teeth perform the primary cutting action, separating the functions to avoid the problems of set teeth
Solution Approach 2:
The invention extracts and removes the setting (bending) of the pre-cutting teeth from the design. Instead of using set teeth that protrude and cause splintering, the patent uses straight pre-cutting teeth with appropriate clearance angles, eliminating the harmful protruding sections while maintaining their pre-cutting function
2Productivity
If set teeth are used to prevent surface tearing, then cutting performance improves, but the cut becomes wider and surface finish deteriorates
Solution Approach 1:
Different regions of the saw blade are given different properties: the pre-cutting teeth have a larger clearance angle and are positioned at an angle to the cutting direction to prevent edge splintering, while the main cutting teeth have optimized geometry for efficient cutting. This local differentiation allows each zone to perform its specific function optimally without compromising overall performance
Solution Approach 2:
The pre-cutting teeth perform the preliminary action of creating a guide groove and preparing the workpiece edges before the main cutting teeth arrive. This preliminary grooving action prevents surface tearing during the main cutting process, allowing the main teeth to cut cleanly without causing splinters or poor surface finish
3Manufacturing precision
If pre-cutting teeth are arranged at an angle to improve sectional image, then cut quality improves, but the teeth still cause workpiece splinters due to protruding sections
Solution Approach 1:
The pre-cutting teeth are arranged at an asymmetric angle to the cutting direction, optimized for their pre-cutting function. This angular arrangement improves the sectional image quality and guide groove formation while the teeth themselves remain straight (not set), eliminating the symmetry of protruding sections that causes splintering
Data Source
Figure 1~4
Figure 5~6
AI summary
The invention relates to a jigsaw blade (1) having one first (3) and one second (4) row of saw teeth disposed at an angle to each other. Both the first and the second row of saw teeth encompass an angle relative to the push or cut direction, the angle (alpha1) of the first row of saw teeth being directed conversely to the angle (alpha2) of the second row of saw teeth.