Stapler Bending Mechanism for Secure Binding
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Solution Overview
Problem
Conventional staplers often fail to securely bind sheet bundles as staple legs tend to separate and float from the sheet surface due to insufficient bending, leading to loose bindings.
Innovation Solution
A stapler design featuring a striking part to penetrate the sheet bundle, a bending part with inner and outer components that inwardly bend the staple legs at specific positions, and a clincher part to ensure the staple legs are directed inwardly, preventing them from separating from the sheet surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the clinchers are moved from an outer side of the staple legs to bend them linearly along the sheet surface, then the stapler structure is simple, but the staple leg tips separate and float from the sheet surface
Solution Approach 1:
The bending part is divided into a first part (fixed on inner side) and a second part (movable on outer side), with the first tip portion at the first position and the second tip portion at a position further from the sheet bundle. This segmentation allows differential bending action where the first part bends the staple legs at the first position while the second part applies force from the outer side, preventing tip separation while maintaining structural simplicity.
Solution Approach 2:
The first part is positioned and configured in advance to bend the staple legs at the first position before the final clinching action. This preliminary bending at a specific position ensures that when the second part completes the bending from the outer side, the staple leg tips are already directed inwardly, preventing floating during the binding process.
2Ease of manufacture
If the staple legs are bent linearly along the sheet surface, then the bending process is simple, but the staple leg tips float from the sheet surface when binding is insufficient
Solution Approach 1:
The bending part applies different bending actions at different locations: the first tip portion at the first position provides localized bending support, while the second tip portion at a position further from the sheet bundle provides additional bending force from the outer side. This local quality differentiation ensures precise inward bending of staple leg tips without requiring complex overall bending mechanisms.
Data Source
AI summary
A stapler includes a striking part which causes a pair of staple legs to penetrate a sheet bundle, a bending part which bends the staple legs at a first position such that tips of the staple legs are directed inwardly, and a clincher part which bends the staple legs at a second position located closer to the sheet bundle than the first position to be entirely directed inwardly. The bending part includes a first part disposed on an inner side of the staple legs and having a first tip portion facing the staple legs at the first position, a second part disposed on an outer side of the staple legs and having a second tip portion facing the staple legs on a non-sheet bundle side than the first position, and a moving part which moves at least one of the first and second parts toward the staple legs.