Center-Fold and Back-Crimp Binding for Saddle-Stitched Booklets
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Solution Overview
Problem
Existing sheet processing apparatuses face challenges in efficiently performing center-folding and crimp-binding processes on sheet bundles, particularly in creating high-quality booklets with saddle stitching.
Innovation Solution
A sheet processing apparatus equipped with a center-folder and a back-crimp binder, controlled by a controller, performs center-folding and crimp-binding processes to form a back portion on sheet bundles, enhancing the quality of saddle-stitched booklets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate processes are used for center-folding and crimp-binding, then operational flexibility is maintained, but processing time increases and productivity decreases
Solution Approach 1:
The patent combines the center-folding function and crimp-binding function into a single integrated apparatus. The center-folder performs both center-folding and crimp-binding operations using a unified structure with a folding blade and crimping roller, eliminating the need for separate processing equipment and reducing overall processing time while maintaining operational flexibility.
Solution Approach 2:
The integrated apparatus performs multiple functions (center-folding and crimp-binding) using a single device. The folding blade and crimping roller work together in one operational sequence, allowing the machine to handle both folding and binding tasks without requiring additional specialized equipment, thereby improving productivity.
2Manufacturing precision
If conventional center-folding and crimp-binding processes are used separately, then process simplicity is maintained, but binding quality and aesthetic appearance deteriorate
Solution Approach 1:
The center-folding operation is performed first as a preliminary action, creating a precise fold at the center of the sheet bundle. This preliminary folding establishes the foundation for subsequent crimp-binding, ensuring that the binding is applied to correctly positioned material and resulting in higher binding quality and aesthetic appearance.
Solution Approach 2:
By merging the center-folding and crimp-binding operations into a single integrated process sequence, the apparatus ensures that the folding and binding are performed in optimal coordination. This integration allows for better control over the interaction between the folding blade and crimping roller, improving the overall binding quality and aesthetic appearance of the final product.
3Productivity
If multiple separate apparatuses are used for folding and binding, then functional specialization is maintained, but processing time and productivity decrease
Solution Approach 1:
The patent merges the center-folder and crimp-binder into a single integrated apparatus that performs both operations sequentially. This consolidation eliminates the need to transfer the sheet bundle between separate machines, significantly reducing processing time and improving productivity while maintaining ease of operation through a unified control system.
Solution Approach 2:
The integrated apparatus maintains continuous useful action by performing the crimp-binding operation immediately after center-folding without interruption or transfer. The folding blade and crimping roller operate in a continuous sequence on the same sheet bundle, eliminating idle time and maximizing processing efficiency while keeping the operation simple and straightforward.
Data Source
AI summary
A sheet processing apparatus includes: a center-folder to perform a center-folding process on a sheet bundle including multiple sheet materials; a back-crimp binder to: form a back portion on the sheet bundle subjected to the center-folding process; and perform a crimp-binding process on the back portion; and a controller configured to: cause the center-folder to perform the center-folding process; and cause the back-crimp binder to perform the crimp-binding process on the back portion while forming the back portion on the sheet bundle in the crimp-binding process.