Reciprocating Saw Blade with Set-Back Tooth Row for Cleaner Cuts
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Solution Overview
Problem
Reciprocating saw blades with existing designs often result in reduced cutting volume and increased sawdust collection during transitions between rows of teeth, leading to poor cutting quality and increased workpiece tears, especially on thin materials.
Innovation Solution
A reciprocating saw blade design featuring three rows of teeth with the third row set back from the longitudinal axis, arranged in a straight line, and with opposite cutting directions, which reduces tearing and enhances cutting quality by controlling the cutting volume and chip space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple rows of saw teeth are arranged close to each other to increase cutting volume, then productivity improves, but workpiece tears increase due to sudden metal removal volume changes at transition points
Solution Approach 1:
The patent applies dimensionality change by offsetting the further row of saw teeth from the longitudinal axis of the blade, creating a stepped arrangement where the further row is positioned closer to the axis than the first and second rows. This spatial reconfiguration in a different dimension (radial offset) allows continuous cutting action without sudden transitions, maintaining productivity while eliminating workpiece tears at transition points.
Solution Approach 2:
The patent implements local quality by giving each row of saw teeth a specific function: the first and second rows perform primary cutting, while the further row, offset closer to the axis, provides secondary cutting and support. This localized functional differentiation ensures that at any point during reciprocating motion, there is always an active cutting row, preventing the sudden metal removal volume changes that cause workpiece tears.
2Adaptability or versatility
If saw teeth are arranged at angles to the longitudinal axis to enable bidirectional cutting, then versatility improves, but cutting quality deteriorates due to tear-outs on workpiece surfaces
Solution Approach 1:
The patent segments the cutting function across three separate rows of saw teeth, each with specific angular orientations. The first row has teeth angled in one direction, the second row has teeth angled in the opposite direction, and the further row is offset and angled to provide transitional cutting. This segmentation allows the blade to perform bidirectional cutting while maintaining surface quality, as each segment handles specific cutting phases without causing tear-outs.
3Manufacturing precision
If the further row of saw teeth is positioned closer to the longitudinal axis to reduce metal removal volume, then workpiece surface quality improves, but chip space decreases
Solution Approach 1:
The patent applies dynamics by designing the further row of saw teeth with offset positioning that creates variable chip space during operation. As the blade reciprocates, the offset arrangement ensures that chip space is dynamically optimized: during forward and reverse strokes, the further row engages at positions that maintain adequate chip evacuation paths, preventing clogging while still enabling reduced metal removal volume for improved surface quality.
Data Source
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AI summary
The invention relates to a reciprocating saw blade (1) for a machine tool, in particular a jigsaw blade, having a first row of saw teeth (3) and a second row of saw teeth (4), the first and second rows of saw teeth (3, 4) being at an angle (α1, α2) to a longitudinal axis (7) of the reciprocating saw blade (1), the angle (α1) of the first row of saw teeth (3) opposing the angle (α2) of the second row of saw teeth (4). According to the invention, arranged between the first and second rows of saw teeth (3, 4) there is a further row of saw teeth (3a, 4a) which is set back, in particular suddenly set back, towards the longitudinal axis (7) in relation to the first and second rows of saw teeth (3, 4).