Asymmetric Protrusion Movement Roller for Belt Transport
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Solution Overview
Problem
Conventional metallic rollers fail to adequately reduce winding movement of endless belts, leading to transport failures and belt damage in applications like image forming devices, where the belt tends to move obliquely or become crinkled, affecting transport timing and longevity.
Innovation Solution
The metallic movement roller features protrusions on its outer surface, with triangular cross-sections where the vertex is displaced from the perpendicular bisector, arranged at specific intervals along the shaft direction, and a winding movement restriction unit, such as a disc-shaped member and circumferential wall, to prevent unwanted belt movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional metallic roller is used to transport the endless belt, then the belt transport function is provided, but the belt exhibits winding movement and oblique displacement causing transport failures and belt damage
Solution Approach 1:
The roller surface is modified with locally differentiated features: protrusions with asymmetric triangular cross-sections are formed at specific positions. These local structural changes create directional friction characteristics that prevent winding movement while maintaining normal transport function.
Solution Approach 2:
The protrusions are designed with asymmetric triangular cross-sections where the vertex is displaced from the perpendicular bisector of the opposite side. This asymmetry creates different friction characteristics in different directions, generating resistance forces that counteract the winding movement tendency of the belt.
2Object-affected harmful factors
If the roller surface is ground to create scale-shaped splinters, then some movement resistance is produced, but metallic rollers still cannot sufficiently reduce winding movement
Solution Approach 1:
The surface geometry parameters are fundamentally changed from conventional grinding patterns to specifically shaped protrusions with asymmetric triangular cross-sections. This parameter change creates more effective directional friction characteristics that sufficiently reduce winding movement where conventional grinding failed.
3Object-affected harmful factors
If protrusions with asymmetric triangular cross-sections are formed on the roller surface, then winding movement of the belt is significantly reduced, but the roller structure becomes more complex
Solution Approach 1:
Rather than changing the entire roller structure, only localized protrusions with specific asymmetric shapes are formed on the roller surface. This localized approach achieves the desired effect while minimizing overall structural complexity.
Solution Approach 2:
The complexity is managed by precisely controlling specific geometric parameters of the protrusions (triangular cross-section with displaced vertex) rather than adopting a completely complex structure. The parameter changes are targeted and minimal.
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 design significantly reduces winding movement of the endless belt, enhancing transport stability and extending belt life by creating directional resistance forces that prevent oblique movement, thereby improving the reliability and longevity of belt transport systems.
Implementation Method 1
the cross sections are triangular and its vertex is displaced from the perpendicular bisector of an opposite side... creating directional resistance forces that prevent oblique movement
Data Source
AI summary
A protrusion (13a) and a protrusion (13b) are formed a predetermined distance apart in the direction of a shaft in the outer circumferential surface of the roller main body (11). The cross sections of the protrusion (13a) and the protrusion (13b) are shaped such that a center portion of the roller main body (11) in the direction of the shaft is a boundary (14), and that on the left side of the boundary (14), a vertex (131a) is displaced to the left side from the perpendicular bisector (133a) of an opposite side (132a) whereas on the right side of the boundary (14), a vertex (131b) is displaced to the right side from the perpendicular bisector (133b) of an opposite side (132b). In this way, in a metallic movement roller that moves a strung endless belt, the winding movement and the like of the belt can be prevented, and the belt can be intentionally moved in a specific direction.