Dual-Layer Rubber Roller for Inclined Paper Contact
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Solution Overview
Problem
Conventional paper sheet take-out apparatuses face issues with insufficient frictional force when paper sheets are inclined, leading to uneven wear of the take-out roller and increased likelihood of multiple sheet feeding, due to inadequate contact pressure and friction distribution.
Innovation Solution
A rubber roller with an outer layer of JIS-A rubber hardness between 35 Ha and 90 Ha and an inner layer of non-foamed rubber with hardness between 5 Ha and 25 Ha, allowing for stable and wide contact with paper sheets regardless of inclination, and a remover section for deformation to maintain consistent friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the take-out roller contacts a inclined paper sheet at the edge, then the roller can still rotate, but the frictional force becomes insufficient and the roller becomes unevenly worn
Solution Approach 1:
The patent applies parameter changes by specifying precise hardness ranges for both the outer layer (35-90 Ha) and inner layer (5-25 Ha) of the roller. This controlled parameter change ensures the roller maintains optimal deformation characteristics to adapt to inclined paper sheets while preventing edge contact and uneven wear, thereby maintaining consistent frictional force throughout the roller's service life.
Solution Approach 2:
The patent employs composite materials by constructing the roller with two distinct rubber layers having different hardness properties. The softer inner layer provides deformation capability to maintain contact with inclined surfaces, while the harder outer layer ensures wear resistance and stable friction characteristics, collectively resolving the contradiction between friction consistency and roller durability.
2Force
If the contact pressure of the take-out roller is increased, then the frictional force improves, but the possibility of multiply feeding two or more overlapped paper sheets increases
Solution Approach 1:
The patent resolves this contradiction through parameter changes in the roller's hardness characteristics. By optimizing the hardness range of both layers, the roller achieves sufficient frictional force through improved contact area and pressure distribution rather than increasing overall contact pressure, thereby preventing multiple sheet feeding while maintaining reliable single sheet extraction.
3Force
If a mechanism to move the rubber roller according to paper sheet state changes is added, then the frictional force can be optimized, but the apparatus structure becomes complex and manufacturing cost increases
Solution Approach 1:
The patent applies the self-service principle by designing a roller that automatically adapts to inclined paper sheets through its own deformation characteristics. The dual-layer structure enables the roller to self-adjust its contact area and pressure distribution in response to paper sheet inclination, eliminating the need for external adjustment mechanisms while maintaining optimized frictional force.
Solution Approach 2:
The patent uses parameter changes in the material properties (hardness ranges) to enable the roller to inherently respond to paper sheet state variations. This material-based adaptation replaces complex mechanical adjustment systems, simplifying the overall apparatus structure while achieving frictional force optimization.
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
Ensures consistent and sufficient frictional force application, prevents uneven wear, and reduces the risk of multiple sheet feeding, simplifying the apparatus structure and reducing manufacturing costs.
Implementation Method 1
the inner layer hardness is set soft over JIS-A 5 Ha and below 25 Ha. Therefore, the rubber roller is configured to make contact with a paper sheet stably and sufficiently widely by deforming the inner surface according to the state (e.g., inclination) of a paper sheet to make contact with the outer surface
Implementation Method 2
The take-out roller rotates and contacts a paper sheet at one end of the stacking direction, and takes out the paper sheet by the frictional force generated between the peripheral surface and the paper sheet surface
Data Source
AI summary
A take-out roller (4) which rotates and contacts a paper sheet (P) supplied to a take-out position has an outer layer (42) to contact the paper sheet (P) and an inner layer (44) provided inside the outer layer. The outer layer (42) is made of relatively hard rubber material with a sufficient coefficient of kinetic friction. The inner layer (44) is made of relatively soft non-foamed rubber material deformable by a relatively weak force. When the take-out roller (4) contacts the paper sheet (P) supplied to the take-out position in the inclined state, the inner layer (44) is largely deformed, and the outer surface of the outer layer (42) stably contacts the surface of the paper sheet (P).