Crimp Mark Orientation for Sheet Binding Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sheet processing techniques for creating center-bound booklets using crimp binding suffer from issues such as incongruous double-page spreads and peeling of crimped portions due to page turning actions, resulting in poor quality and binding strength.
Innovation Solution
A sheet processing apparatus comprising a center folder, a back-crimp binder, and circuitry, which performs a center-folding process, forms a back portion of the fold, and applies crimp binding parallel to the fold, ensuring a crimp mark is formed on the back portion of the sheet bundle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If crimp binding is performed at a position away from the folding position, then the binding process can be simplified, but the crimped portion is subject to peeling off when pages are turned
Solution Approach 1:
The patent applies preliminary action by performing the crimp binding process after the folding position is established, ensuring that the crimp mark is formed at the optimal position to prevent peeling. The apparatus first folds the sheet bundle to create the folding position, then applies the crimp binding at this predetermined location, rather than binding at a separate away-position. This sequence ensures the crimped portion remains stable during page turning while maintaining manufacturing simplicity.
2Productivity
If conventional center binding techniques are used, then the binding process can be completed, but the double-page spread becomes incongruous when a page is turned
Solution Approach 1:
The patent applies local quality by focusing the crimp binding action specifically at the folding position rather than using conventional center binding techniques. The apparatus positions the crimping mechanism to create a localized crimp mark at the folding position, which ensures proper alignment and congruity of the double-page spread. This localized approach maintains binding completion while correcting the alignment issue that occurs with conventional methods.
3Productivity
If crimp binding is performed without forming a crimp mark parallel to the fold portion, then the binding process is faster, but the binding strength is insufficient
Solution Approach 1:
The patent merges the crimp binding action with the formation of a crimp mark parallel to the fold portion. The apparatus integrates these two functions into a single binding operation, where the crimping mechanism simultaneously creates both the binding structure and the parallel crimp mark. This merged approach maintains binding speed while ensuring sufficient binding strength through the properly positioned crimp mark that prevents peeling during page turning.
Data Source
AI summary
A sheet processing apparatus includes a center folder, a back-crimp binder, and circuitry. The center folder performs a center-folding process to form a fold portion on a sheet bundle including multiple sheets. The back-crimp binder includes a back-portion former and a crimp binder. The back-portion former forms a back portion of the fold portion on the sheet bundle subjected to the center-folding process. The crimp binder performs a crimp-binding process on the back portion of the sheet bundle subjected to the center-folding process. The circuitry is to cause the back-crimp binder to form a crimp mark parallel to the fold portion on the back portion of the sheet bundle.