Binding Device Protrusion Hollows Corner Stability
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Solution Overview
Problem
Conventional binding devices for recording material bundles often fail to securely bind sheets together, particularly at the corners, leading to unbinding under external forces.
Innovation Solution
A needle-free binding device featuring a pair of pushing members with protrusions and recesses, where hollows are formed at the ends of the protrusions to reduce the contact area and increase binding forces, thereby enhancing the stability of the sheet bundle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the contact area between the pushing member and recording-material bundle is increased, then the binding force is improved, but the binding force concentration at corners deteriorates
Solution Approach 1:
The pushing member features hollows at specific locations (corners and intermediate portions) of the protrusions, creating non-uniform contact characteristics. This local modification allows the corners to concentrate binding force while the intermediate portions provide distributed support, resolving the contradiction between overall binding strength and corner binding stability.
2Reliability
If the contact area between protrusions and recording-material bundle is reduced, then the binding force concentration is improved, but the overall binding strength deteriorates
Solution Approach 1:
The pushing member's protrusions are segmented into multiple functional zones: hollows at corner portions for force concentration and hollows at intermediate portions for distributed support. This segmentation allows different regions to fulfill different binding requirements simultaneously, achieving both force concentration and overall strength.
Data Source
AI summary
A binding device includes a first pushing member that includes protrusions along one direction and that pushes a recording-material bundle as a result of pushing the protrusions against one of surfaces of the recording-material bundle, the protrusions disposed side by side in a direction that intersects the one direction; and a second pushing member that includes protrusions along the one direction and that pushes the recording-material bundle as a result of pushing the protrusions against the other surface of the recording-material bundle, the protrusions disposed side by side in the direction that intersects the one direction, wherein, in at least one end portion in the one direction of each protrusion of at least one of the first pushing member and the second pushing member, a hollow is disposed in a top portion of each protrusion.