Cylindrical Shaft Design for Printer Transport Rollers
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Solution Overview
Problem
Existing cylindrical shafts used in transport rollers for printers face challenges in achieving high frictional force while maintaining accuracy and dimension, leading to uneven transportation, particularly in inkjet printers where high precision is required, due to deformation and distortion caused by convex and concave portion fittings over the entire length.
Innovation Solution
A cylindrical shaft is formed through press work with a central linear section and folded sections on both ends, where the connection linear sections are designed to ensure accurate alignment and contact, reducing deformation and distortion, and a high friction layer with inorganic particles is applied to enhance transportation force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If convex and concave portions are fitted over the entire length of the cylindrical shaft, then the shaft can be formed cost-effectively, but deformation and distortion occur causing uneven transportation
Solution Approach 1:
The cylindrical shaft is divided into two distinct regions: a central linear section without fitting portions and folded sections at both ends with convex and concave portions. This segmentation allows the ends to be joined cost-effectively while preserving the accuracy of the central transportation surface, preventing deformation and uneven transportation.
2Force
If protrusions are formed on the surface of the hollow cylindrical shaft, then frictional force increases, but the hollow structure causes deformation
Solution Approach 1:
Protrusions are formed only on the folded sections at both ends of the cylindrical shaft, not on the entire surface. This localized approach increases frictional force through the protrusions while avoiding deformation of the hollow central section, maintaining both structural stability and transportation performance.
3Force
If a solid metallic round bar is used instead of a hollow cylindrical shaft, then high frictional force is achieved, but cost increases
Solution Approach 1:
The cylindrical shaft combines a hollow metallic structure with surface protrusions formed by pressing work. This composite approach maintains the cost and weight advantages of hollow construction while achieving the high frictional force typically associated with solid materials through the strategically positioned protrusions on the folded sections.
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 achieves reduced cost and weight while maintaining high accuracy and preventing uneven transportation, ensuring reliable and precise paper feeding in printers by minimizing deformation and enhancing frictional force.
Implementation Method 1
a high friction layer with inorganic particles is applied to enhance transportation force
Data Source
AI summary
A cylindrical shaft is provided of which a pair of ends are formed in a cylindrical shape by a press work so as to form a joining portion therebetween. Here, the joining portion includes: a central linear section which is provided on a center portion in an axis direction of the cylindrical shaft and is formed in a linear shape to be parallel to the axis direction of the cylindrical shaft; and a folded section which includes a plurality of intersections which are provided on both ends of the center portion and are disposed so as to be extended in a direction perpendicular to the axis direction of the cylindrical shaft, and a connection linear section which connects ends of a pair of the adjacent intersections. In addition, the connection linear section is constituted by a first linear section which connects ends on one side of the pair of the intersections and a second linear section which connects ends on the other side of the pair of the intersections and formed shorter than the first linear section. In addition, a distance between the pair of the ends of the center portion is longer than a distance between the pair of the ends of the second linear section.