Conveyance Roller Surface Roughness for Coated Paper Slip
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Solution Overview
Problem
Existing sheet conveyance apparatuses face challenges in maintaining sufficient conveyance force over time, particularly with coated papers, due to wear and friction issues, leading to slip and conveyance failures, as conventional designs fail to effectively manage surface roughness and paper powder accumulation.
Innovation Solution
A sheet conveyance apparatus with a rubber surface layer having a surface roughness of 8 μm to 30 μm is used, featuring micro convexo-concaves to maintain friction resistance and prevent paper powder adhesion, ensuring consistent conveyance force throughout the lifespan of the apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the conveyance roller surface is made smooth to reduce friction, then the initial conveyance force is sufficient, but the friction resistance deteriorates quickly due to wear and paper powder adhesion
Solution Approach 1:
The patent applies a rubber surface layer with specific surface roughness (Ra: 8-30 μm) only on the contact surface of the conveyance roller, while the core maintains different properties. This localized quality difference ensures that the surface provides sufficient friction for conveyance while the core provides structural stability, resolving the contradiction between initial conveyance force and long-term durability.
Solution Approach 2:
The patent specifies precise surface roughness parameters (Ra: 8-30 μm) for the rubber surface layer to optimize the balance between friction resistance and paper powder adhesion prevention. By controlling this physical parameter within a specific range, the roller maintains effective conveyance force throughout its service life, addressing both the initial force requirement and long-term durability.
2Reliability
If the rubber surface layer has high surface roughness to prevent paper powder adhesion, then conveyance force is maintained, but the surface becomes too rough for smooth conveyance
Solution Approach 1:
The patent defines a specific surface roughness range (Ra: 8-30 μm) that optimizes the balance between preventing paper powder adhesion and maintaining smooth conveyance. This parameter control ensures that the surface is rough enough to prevent powder accumulation but not so rough as to cause conveyance issues, thereby achieving both reliability and ease of operation.
3Strength
If a hard rubber material is used to maintain surface integrity, then wear resistance is improved, but the surface roughness deteriorates faster due to friction
Solution Approach 1:
The patent employs a composite structure with a rubber surface layer on the conveyance roller, combining the wear resistance of rubber with the structural integrity of the roller core. The rubber layer's specific surface roughness (Ra: 8-30 μm) is maintained through this composite design, allowing the surface to resist wear while preserving the necessary roughness characteristics for effective conveyance over time.
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 solution maintains a stable and sufficient conveyance force for various paper types, including coated papers, by maintaining the surface roughness within the specified range, preventing slip and ensuring reliable operation for extended periods.
Implementation Method 1
a surface layer made up of rubber and a surface roughness Ra of the surface layer remains in a range from 8 μm to 30 μm... featuring micro convexo-concaves to maintain friction resistance
Implementation Method 2
the rougher condition of the rubber roller surface where a large number of micro convexo-concaves are provided can ensure the more area of the rubber surface where the paper powder including the coating material does not cover
Data Source
AI summary
A sheet conveyance apparatus having: a conveyance roller, wherein a surface roughness Ra of a surface layer remains in a range from 8 μm to 30 μm, at a stage where a total length of sheets conveyed reaches at 42,000 m.