Liquid Crimp Binding for Wavy Sheet Media
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Solution Overview
Problem
Existing medium processing apparatuses face challenges in applying a stable amount of liquid to wavy or curved sheets during crimp binding, leading to unstable binding and potential sheet peeling due to disturbed sheet shapes.
Innovation Solution
A medium processing apparatus with a conveying unit, liquid applier, and crimper that applies liquid to sheets using a presser and liquid application member, followed by crimping to bind the sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If liquid is applied to wavy or curved sheets during crimp binding, then binding strength is improved, but sheet shape disturbance causes unstable liquid application and sheet floating
Solution Approach 1:
The presser presses the sheet bundle before liquid application to flatten wavy or curved sheets in advance. This preliminary flattening action ensures that the sheets are in a stable, flat state when liquid is applied, preventing sheet floating and ensuring uniform liquid distribution across the binding position.
Solution Approach 2:
The presser applies a counteracting force to prevent the harmful effect of sheet waviness and curvature. By pressing the sheets flat before liquid application, the system counteracts the sheet shape disturbance that would otherwise cause unstable liquid application and binding failures.
2Productivity
If an increased number of sheets are bound, then productivity is improved, but binding teeth cannot bite into the sheet bundle effectively causing sheets to peel off
Solution Approach 1:
The system changes the physical state of the sheet bundle by applying liquid to the binding position. This parameter change (adding liquid) increases the binding strength and allows the binding teeth to effectively bite into even thick sheet bundles, maintaining binding quality regardless of the number of sheets being bound.
Solution Approach 2:
Liquid acts as an intermediary substance that facilitates the binding process. By applying liquid to the binding position, it enables the binding teeth to penetrate and bind the sheet bundle effectively, even when the bundle contains a large number of sheets that would otherwise be too thick or resistant.
3Device complexity
If crimp binding is performed without liquid application, then device complexity is reduced, but binding strength is insufficient for stable sheet bundling
Solution Approach 1:
The presser serves multiple functions: it flattens wavy sheets, holds the sheet bundle stable during liquid application, and prepares the binding position for effective crimping. This multi-functionality allows the system to achieve strong binding with a relatively simple structure, avoiding the need for complex separate mechanisms for each function.
Data Source
AI summary
A medium processing apparatus includes a conveying unit, a liquid applier, and a crimper. The conveying unit conveys a medium in a conveyance direction. The liquid applier applies liquid to the medium conveyed by the conveying unit. The liquid applier includes a presser and a liquid application member. The presser presses the medium. The liquid application member contacts and is separated from the medium while the presser presses the medium. The crimper presses and deforms a plurality of media including the medium to which the liquid is applied by the liquid applier, to crimp and bind the plurality of media.