Diameter-Sectioned Sheet Folding Rollers for Thick-Bundle Reinforcement
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Solution Overview
Problem
Existing sheet processing devices face challenges in reinforcing additional folding operations, particularly when dealing with sheet bundles that are thick or have a large number of sheets, leading to inadequate fold intensification and potential damage such as creases or biting traces.
Innovation Solution
The sheet processing device employs a first roller with a large and small diameter section, and a pair of second rollers with corresponding large and small diameter sections, arranged to apply force along and orthogonal to the fold direction, using taper sections to securely reinforce the fold by holding and moving the sheets in a specific configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional folding units are used to fold sheets, then the folding operation can be performed, but the fold reinforcement is insufficient when dealing with thick sheet bundles, leading to inadequate fold intensification and potential damage
Solution Approach 1:
The folding unit is segmented into multiple functional components: a first roller with large and small diameter sections, and a pair of second rollers with corresponding diameter variations. This segmentation allows different sections to perform specialized functions - the large diameter sections provide gentle sheet engagement while the small diameter sections deliver concentrated fold reinforcement, thereby achieving intensive folding without sheet damage.
Solution Approach 2:
The rollers are designed with non-uniform diameter along their axial direction, creating local quality variations. The large diameter sections provide gentle contact for sheet feeding, while the small diameter sections create localized high-pressure zones for fold reinforcement. This local quality differentiation enables precise control over where and how folding force is applied, intensifying the fold at critical locations without damaging the sheet.
2Force
If additional folding is performed on thick sheet bundles, then fold reinforcement is attempted, but the conventional configuration cannot apply sufficient force along and orthogonal to the fold direction, resulting in inadequate fold intensification
Solution Approach 1:
The invention addresses force application in multiple dimensions by configuring rollers that can exert force both along the fold direction and orthogonal to it. The first roller primarily applies force along the fold direction, while the pair of second rollers, positioned to contact the sheet from opposite sides, apply force orthogonal to the fold direction. This multi-dimensional force application ensures comprehensive fold reinforcement for thick sheet bundles.
Solution Approach 2:
The folding mechanism uses a composite configuration of rollers with different diameter profiles working in combination. The first roller with its large-small diameter variation works in conjunction with the pair of second rollers, creating a composite folding system that delivers both gentle sheet handling and intensive fold reinforcement through the coordinated action of different roller sections.
3Reliability
If conventional single-roller configurations are used, then the device complexity is low, but the ability to securely hold and move sheets for additional folding is insufficient
Solution Approach 1:
The invention merges the functions of multiple rollers into a coordinated system. The first roller with large and small diameter sections combines gentle sheet engagement capability with fold reinforcement capability. The pair of second rollers is merged with the first roller to form an integrated additional folding unit that can securely hold and move sheets through their coordinated rotation and positioning, achieving reliable sheet handling despite increased component count.
Data Source
AI summary
A sheet processing device includes a folding unit, a first roller, and a pair of second rollers. The folding unit folds a sheet and forms a fold in the sheet. The pair of second rollers moves in a fold direction and additionally folds the fold. The first roller includes a first large diameter section and a first small diameter section. Each of the pair of second rollers includes a second large diameter section and a second small diameter section. The second large diameter section holds the sheet between the second large diameter section and the first small diameter section. The second small diameter section holds the sheet between the second small diameter section and the first large diameter section.