Straight-Line Bonding Roller for Smooth Medium Transport
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In recording devices like printers and facsimiles, medium transporting rollers with a shaft shape often cause the front edge of the recording medium to get caught due to complex bonding configurations, leading to mechanical strength improvements but transportation issues.
Innovation Solution
A medium transporting roller is formed by processing a plate material into a cylindrical shape with a bonding portion where the edge portions are bonded in a straight line intersecting the circumference, preventing the recording medium from catching on the roller's surface, and arranging concave and convex engaging portions outside the contact region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a zigzag shape bonding portion is used to improve mechanical strength, then joining strength is improved, but the front edge of recording medium gets caught up
Solution Approach 1:
The bonding portion is designed with different characteristics in different regions: the region contacting the recording medium has a straight line configuration for smooth transport, while other regions may have zigzag patterns for mechanical strength. This local differentiation resolves the contradiction between transport smoothness and structural strength.
Solution Approach 2:
The bonding portion is segmented into functionally distinct zones: a straight-line region in the recording medium contact area and potentially zigzag regions elsewhere. This segmentation allows each zone to optimize for its specific function without compromising the other.
2Manufacturing precision
If a solid shaft is used for the roller, then rigidity and transport precision are improved, but cost and device weight increase
Solution Approach 1:
A hollow cylindrical shaft structure is used instead of a solid shaft. This thin-walled cylindrical design maintains sufficient rigidity and transport precision while significantly reducing the weight and cost compared to a solid shaft, effectively applying the principle of using thin-walled structures to achieve strength-to-weight optimization.
3Weight of moving object
If a hollow cylindrical shaft is used, then weight and cost are reduced, but rigidity decreases
Solution Approach 1:
The hollow cylindrical shaft uses optimized thin-walled construction that maintains structural rigidity despite the reduced material volume. The cylindrical geometry itself provides structural efficiency, and the wall thickness is designed to achieve the necessary stiffness while minimizing weight.
Solution Approach 2:
The shaft may utilize composite material construction or advanced material properties to enhance the rigidity of the hollow cylindrical structure, allowing the lightweight design to achieve the required mechanical stability for precise medium transport.
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
This configuration ensures smooth transportation of the recording medium by preventing catching on the roller's surface and improving mechanical strength while maintaining accurate processing and bonding characteristics.
Implementation Method 1
a roller with a shaft shape is used where a high friction layer is formed on a surface of a metallic shaft as shown in JP-A-2001-63862 and JP-A-2001-158544. Here, the high friction layer is formed by holding abrasion resistant particles on an outer circumference surface of the shaft body using an adhesive layer and performs a function of improving a friction coefficient with the recording medium and preventing slipping.
Data Source
AI summary
In a recording device which performs recording on a recording medium, a transport driving roller which carries out transporting of the recording medium as a medium transport roller is formed by processing a plate member into a cylindrical shape. A bonding portion where the pair of edge portions of the plate material are bonded has a transport region, which is a region where at least the recording medium comes into contact with, extends in a straight line shape in a direction which intersects a circumference line.