Multi-Directional Curving for Z-Fold Sheet Stability
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Solution Overview
Problem
Folding methods like Z-fold, where sheets are curled in one direction, result in unfavorable stacking due to curved end portions, leading to instability and potential falling when stacked.
Innovation Solution
A post-processing apparatus with a decurling device that curves sheets in multiple directions, creating an S-shaped cross-section, to improve accommodation and stability during Z-folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sheets are curled in one direction before folding, then the folding ability is improved, but the stacking stability deteriorates when using Z-fold method
Solution Approach 1:
The invention transitions from single-direction curling to multi-directional curling by adding curvature in both the longitudinal direction (transport direction) and lateral direction. This dimensional expansion of the curling pattern allows the sheet ends to face outward in opposite directions after Z-folding, improving stacking stability while maintaining folding ability.
Solution Approach 2:
The invention creates asymmetric curvature patterns where the sheet is curled differently in the longitudinal direction versus the lateral direction. This asymmetric multi-directional curling ensures that after Z-folding, the end portions of sheets face outward in opposite directions, preventing unfavorable stacking states.
2Ease of manufacture
If sheets are curled in one direction, then folding processing is facilitated, but end portions curve in multiple directions after Z-fold causing unfavorable stacking states
Solution Approach 1:
The invention applies preliminary multi-directional curling to the sheets before folding processing. By pre-curving the sheets in both longitudinal and lateral directions, the invention ensures that after Z-folding, the end portions naturally face outward in opposite directions, avoiding the need for post-fold correction and preventing unfavorable stacking states.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the ability of sheets to be stacked neatly and securely, preventing instability and falling, by curving sheets in multiple directions before Z-folding, thus improving the stacking quality.
Implementation Method 1
a curving device that curves a sheet P, which is transported to the curving device, by pressing the sheet
Data Source
AI summary
A post-processing apparatus includes memory and a processor configured to control a curving device that curves a sheet, which is transported to the curving device, by pressing the sheet, control folding processing that is performed on a sheet curved by the curving device, and control, when folding processing is performed such that two ends of a sheet in a transport direction of the sheet face outward in opposite directions after the folding processing has been performed on the sheet, the curving device so as to curve the sheet in plural directions with respect to a transport surface.