Compressible-Coated Folding Rollers for Variable Signature Thickness
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Solution Overview
Problem
Existing folding devices require manual adjustment of roller gaps to accommodate varying substrate thicknesses and page numbers, leading to inefficiencies, errors, and potential damage during the folding process, especially with thick or multi-layered signatures.
Innovation Solution
A folding roller with an elastic and compressible coating that adapts the effective roller gap to the substrate thickness, allowing for consistent fold quality without manual adjustments, using foamed or microcellular polyurethane for high fatigue strength and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a hard outer surface is used on folding rollers, then the roller structure is simple and durable, but the roller gap must be manually adjusted for varying substrate thicknesses, increasing operation complexity and time
Solution Approach 1:
The patent applies parameter changes by transitioning from a hard, non-compliant roller surface to an elastic, compliant coating. This allows the roller gap to automatically adapt to varying substrate thicknesses through material deformation, eliminating manual adjustment requirements while maintaining structural simplicity
Solution Approach 2:
The patent uses composite materials by combining a rigid roller core with an elastic coating layer. The core provides structural integrity and simplicity, while the elastic coating (such as rubber or polymer material) provides adaptive compliance, resolving the contradiction between structural simplicity and operational ease
2Manufacturing precision
If the roller gap is set narrowly to accommodate thin signatures, then thin signatures can be folded properly, but thick signatures cannot pass through, causing jams
Solution Approach 1:
The elastic coating changes its compression parameter dynamically based on substrate thickness. For thin signatures, the coating compresses minimally maintaining precise fold geometry; for thick signatures, the coating compresses more to increase the effective gap, preventing jams while maintaining fold quality
Solution Approach 2:
The patent introduces dynamics by making the roller surface compliant rather than rigid. The elastic coating dynamically adjusts its thickness in the roller gap through compression, allowing the system to adapt to different signature thicknesses in real-time during operation
3Adaptability or versatility
If the roller gap is set widely to accommodate thick signatures, then thick signatures can pass through, but thin signatures cannot be folded precisely, causing poor fold quality
Solution Approach 1:
The elastic coating's compression parameter changes in response to substrate thickness. When folding thin signatures, the coating remains nearly uncompressed, maintaining a narrow effective gap for precise folding. When folding thick signatures, the coating compresses to create a wider effective gap, allowing proper accommodation
4Manufacturing precision
If manual adjustment of roller gap is performed frequently to accommodate varying substrate thicknesses, then fold quality can be maintained, but production time increases and operator error risk increases
Solution Approach 1:
The elastic coating provides self-service by automatically adjusting the effective roller gap according to substrate thickness without operator intervention. The material's inherent elasticity enables the system to self-regulate for different signature thicknesses, maintaining fold quality while eliminating adjustment time and reducing error risk
Solution Approach 2:
The system provides implicit feedback through the elastic coating's compression response. The coating automatically senses substrate thickness through mechanical compression and adjusts the effective gap accordingly, creating a self-regulating system that maintains fold quality across varying conditions
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
The elastic coating compensates for fluctuations in signature thickness and page numbers, ensuring reliable folding without the need for frequent gap adjustments, reducing waste and maintaining product quality across different folding conditions.
Implementation Method 1
the elastic coating is compressible
Implementation Method 2
the elastic coating compensates for fluctuations in signature thickness and page numbers
Data Source
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Figure 5
AI summary
The invention relates to a folding roller (1) for folding signatures in a folding device (10), wherein the folding roller (1) comprises a cylindrical folding roller body (3) with a cylindrical surface, the cylindrical surface having at least a partial elastic coating (5). The invention is therefore based on the objective of providing a solution with which different and/or differently thick folded products can be produced without changing the roller gap (15) between the pair of folding rollers (14) while maintaining consistent folding quality, and thus also eliminating the need for adjustment of the roller gap (15) during printing or ongoing production. This objective is achieved by the fact that the device according to the invention comprises a folding roller (1) in which the elastic coating (5) is compressible.