Binding Machine Cutting Blade Segmented Slit Design
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Solution Overview
Problem
Existing binding machines with metal needles face issues in maintaining a reliable joined state between the cut-and-raised piece and the cut hole, especially on sheets with low friction resistance, leading to easy disengagement.
Innovation Solution
The binding machine incorporates a punching blade and a cutting blade with a wide width portion on the cut-and-raised piece, engaging it with both a first slit and a second slit in the cut hole, and a projection to facilitate engagement, ensuring a more secure connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a linear cut hole is formed in the sheet, then the punching operation is simple, but the joined state between the cut-and-raised piece and the cut hole is unreliable on sheets with low friction resistance
Solution Approach 1:
The cut hole is divided into multiple segments (first cut hole, second cut hole, third cut hole) instead of forming a single linear cut hole. The cutting blade creates multiple separate cut holes that collectively engage the cut-and-raised piece, providing multiple engagement points that prevent disengagement while maintaining a simple punching operation.
2Ease of manufacture
If the cut-and-raised piece has a constant width, then the punching operation is straightforward, but the engagement with the cut hole releases easily under separating force
Solution Approach 1:
The cut-and-raised piece is designed with varying width along its length, creating a tapered shape where the width changes from the base end to the distal end. This local variation in geometry creates a wedge-shaped engagement where the wider base portion provides stronger engagement with the multiple cut holes, while the narrower distal end allows for easier insertion, thereby increasing engagement strength without complicating the punching operation.
Data Source
AI summary
A punching blade can form a cut-and-raised piece provided with a wide width portion in a distal-end region, a cutting blade is provided with a first blade having a window with which the cut-and-raised piece is engaged and forming a first slit and a second blade for forming a second slit extending in a direction of a punched hole from the midstream of the first slit. It is also configured such that an edge from the wide width portion of the cut-and-raised piece to the base end can be engaged with the second slit.