Staple-less Binding Unit Central Projection Design
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Solution Overview
Problem
Staple-less binding devices often cause paper sheets to be torn due to uneven contact between the binding projections and the sheets, as peripheral projections tend to come into contact before the central ones, leading to inadequate binding force distribution.
Innovation Solution
A binding unit with a central projecting portion that protrudes more than peripheral projections, ensuring even contact and binding force distribution by allowing the central projections to engage first, thereby preventing tearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all projecting portions are formed in the same shape, then the device structure is simple, but the paper sheets are torn due to uneven contact
Solution Approach 1:
The binding unit implements local quality by making the central projecting portion protrude more than the peripheral projecting portions. This creates different contact sequences where the central portion contacts the paper bundle first, allowing gradual compression from center to periphery, which prevents paper tearing while maintaining overall structural simplicity.
2Productivity
If peripheral projecting portions come into contact before central ones, then the binding process is faster, but the binding force distribution is uneven
Solution Approach 1:
The central projecting portion is designed to protrude more, performing the preliminary action of contacting the paper bundle first. This initiates the binding process from the center outward, ensuring proper force distribution before the peripheral portions make contact, thus achieving both efficient binding speed and uniform force distribution.
Data Source
AI summary
A binding unit is a binding unit used in staple-less binding in which mediums are bound by being interposed between binding units having plural recesses and projections in a thickness direction of a bundle of the mediums, in which, among the plural projections, a tip end of a projecting portion, which is at a central portion in an arrangement direction of the projections, protrudes further than a projecting portion disposed at a position different from the central portion.