Fuser Unit Belt Guide Segmentation for Alignment Stability
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Solution Overview
Problem
The existing fuser units in electrophotographic image forming apparatuses face challenges in precisely arranging and stabilizing the belt guide due to its tendency to swing within a gap, leading to inconsistent belt alignment and tension distribution.
Innovation Solution
The fuser unit incorporates a belt guide with specific surface configurations and urging members to securely contact and guide the endless belt, preventing movement and ensuring stable alignment by using protrusions, inner surface guides, and strategically placed urging members to maintain belt tension and prevent deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the belt guide is fitted to the pressing stay with a gap to allow swinging, then the pressing belt can be bent and contacted to the restraining part to disperse force, but the belt guide cannot be precisely arranged and its movement cannot be restrained
Solution Approach 1:
The belt guide is divided into a movable portion and a fixed portion. The movable portion can swing to disperse force, while the fixed portion is precisely arranged on the pressing stay. This segmentation allows the system to simultaneously achieve force dispersion and precise arrangement.
Solution Approach 2:
The belt guide is designed with a multi-dimensional structure including width-wise extension and depth-wise positioning. The movable portion swings in one dimension while the fixed portion maintains precise positioning in other dimensions, achieving both force dispersion and precise arrangement through dimensional differentiation.
2Adaptability or versatility
If the belt guide swings within a gap, then the pressing belt can be guided flexibly, but the belt guide movement cannot be restrained leading to inconsistent belt alignment
Solution Approach 1:
The belt guide is segmented into movable and fixed portions. The movable portion provides flexibility for belt guidance adaptation, while the fixed portion ensures stable and consistent belt alignment by preventing excessive movement of the entire belt guide assembly.
Solution Approach 2:
The movable portion acts as an intermediary between the fixed belt guide and the pressing belt. It absorbs necessary movements to maintain flexible guidance while the fixed portion serves as a stable reference, ensuring consistent alignment through the mediator's controlled motion.
3Adaptability or versatility
If the belt guide is made movable to accommodate belt tension changes, then the system is more adaptable, but the belt guide cannot be precisely arranged
Solution Approach 1:
The belt guide is divided into movable and fixed portions. The fixed portion ensures precise arrangement and positioning, while the movable portion provides adaptability to accommodate belt tension changes. This segmentation allows simultaneous achievement of precision and adaptability.
Solution Approach 2:
The belt guide structure utilizes dimensional differentiation where the fixed portion maintains precise positioning in critical dimensions, while the movable portion provides adaptability in other dimensions through controlled movement, achieving both precision and adaptability through spatial separation of functions.
Data Source
AI summary
A fuser unit of this disclosure includes: an endless belt; a nip member; a belt guide; a stay; a first member; a second member; and a backup member, wherein the belt guide, which is configured to guide the endless belt, has: a first surface, which faces in a direction from a second end portion towards a first end portion of the endless belt; a second surface, which faces in a direction from the first end portion towards the second end portion of the endless belt; a third surface, which faces in a direction from the stay towards the nip member; a fourth surface, which faces in a direction from the nip member towards the stay; a fifth surface and a sixth surface, which face in the conveyance direction and is arranged to be in contact with the first member.