Sheet Discharge Roller Axially Spaced Plate Members
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Solution Overview
Problem
Existing sheet discharge rollers face a conflict between increasing the rigidity of paper sheets for improved discharging performance and maintaining efficient assembly, as the larger outer diameter of rigidity increasing portions restricts the attachment of rubber members, affecting the transportation force and discharging efficiency.
Innovation Solution
A sheet discharge roller design featuring a rotation shaft with axially spaced transportation rollers and rigidity increasing portions formed integrally, where the rigidity increasing portions are composed of circumferentially divided plate members that allow for a larger outer diameter without compromising the attachment of an annular elastic member, enhancing the rigidity and discharging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer diameter of rigidity increasing portion is increased to enhance paper sheet rigidity, then the rigidity of paper sheet is improved, but the attachment of rubber member becomes restricted
Solution Approach 1:
The rigidity increasing portion is divided into multiple plate members (first plate member and second plate member) that are axially spaced apart. This segmentation allows the rubber member to be attached to the roller portion between the plate members, enabling the rubber member to be compressed effectively while still allowing attachment. The segmented structure resolves the contradiction by creating space for rubber member attachment even when the overall outer diameter is increased for rigidity enhancement.
2Productivity
If the outer diameter of rigidity increasing portion is increased to improve discharging performance, then the rigidity of paper sheet is enhanced, but the transportation force is reduced due to restricted rubber member attachment
Solution Approach 1:
By segmenting the rigidity increasing portion into multiple axially spaced plate members, the structure creates an effective attachment zone for the rubber member. This allows the rubber member to be properly compressed between the plate members, maintaining its elasticity and transportation function while the overall rigidity increasing portion achieves the necessary outer diameter for improved discharging performance.
Solution Approach 2:
The plate members are positioned to create specific local regions with different functional characteristics. The regions between plate members allow rubber member attachment and compression, while the plate members themselves provide the rigidity increasing function. This local differentiation resolves the contradiction between maintaining transportation force and achieving improved discharging performance.
3Ease of manufacture
If roller portion and rigidity increasing portion are formed integrally on rotation shaft to reduce cost, then manufacturing cost is reduced, but the outer diameter of rigidity increasing portion cannot be sufficiently increased
Solution Approach 1:
The integral formation of roller portion and rigidity increasing portion is maintained for cost reduction, but the rigidity increasing portion is segmented into multiple plate members. This segmentation allows the structure to achieve greater effective outer diameter for rigidity enhancement while maintaining the cost benefits of integral formation. The plate members can be positioned axially to create the necessary spacing for rubber member attachment.
Solution Approach 2:
Instead of increasing the radial dimension (outer diameter) of a single monolithic rigidity increasing portion, the invention utilizes the axial dimension by spacing multiple plate members apart. This dimensional transition allows the structure to achieve effective rigidity enhancement without being constrained by the radial expansion limits of the rubber member attachment zone.
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 design effectively increases the rigidity of paper sheets while ensuring easy attachment of the rubber member, maintaining high discharging efficiency and preventing curling of paper sheets during accumulation.
Implementation Method 1
rubber member 93b is radially expanded to have a diameter φD) equal to or larger than an outer diameter (φd) of rigidity increasing portion 92
Implementation Method 2
configured to deform the paper sheet with respect the widthwise direction of the paper sheet into a wavy form when viewed in a sheet discharging direction so that it increases the rigidity of the paper sheet
Implementation Method 3
A friction between the rubber member and the paper sheet provides a sheet transportation force
Data Source
AI summary
In a sheet discharge roller, a transportation roller includes a roller portion formed integrally on a rotation shaft, and an annular elastic member attached to a surface of the roller portion, each of rigidity increasing portions includes a plurality of plate members axially spaced from each other by a predetermined distance, and the plurality of plate members have forms each obtained by circumferentially dividing a circular plate, respectively, are arranged in positions circumferentially shifted from each other, respectively, and thereby exhibit an outer periphery of a substantially circular form when viewed in the axial direction.