Movable Guide Unit for Stable Sheet Conveyance
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Solution Overview
Problem
Conventional electrophotographic image-forming devices experience instability and paper jams due to the pivoting paper guide, which vibrates when handling thick or stiff recording sheets, affecting the stability of sheet conveyance.
Innovation Solution
The image-forming apparatus incorporates a conveying guide system with a fixed guide unit and a movable guide unit that guides the sheet's end portions and exposes the conveying path, reducing vibration and facilitating stable sheet conveyance by allowing the movable guide to pivot between positions, thereby stabilizing the conveyance of sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pivoting paper guide is used to facilitate jam extraction, then ease of operation is improved, but stability of sheet conveyance deteriorates due to vibration when handling thick or stiff sheets
Solution Approach 1:
The paper guide is divided into a fixed guide unit and a movable guide unit. The fixed guide unit provides stable guidance for the sheet, while the movable guide unit can pivot to expose the conveying path for jam extraction. This segmentation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
The guide unit is designed with both fixed and movable portions. The movable guide unit can dynamically change its position between a closed position (for stable conveyance) and an open position (for jam extraction), adapting to different operational needs.
2Ease of operation
If a pivoting paper guide is used to enable easy jam removal, then ease of operation is improved, but device complexity increases due to additional movable components
Solution Approach 1:
The guide structure is segmented into fixed and movable portions, where only the necessary guide unit is made movable. This reduces the overall complexity compared to making the entire guide system movable, while still achieving the goal of easy jam removal.
Solution Approach 2:
The movable guide unit is extracted as a separate component from the fixed guide structure. This allows the movable portion to be independently designed and optimized for its specific function of exposing the conveying path, without complicating the entire guide system.
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 enhances the stability of sheet conveyance, reduces the likelihood of paper jams, and allows for easy removal of jammed sheets without direct contact with heated areas, improving operational efficiency and user safety.
Implementation Method 1
The fixing unit is configured to thermally fix a developer image deposited on a sheet to provide an image-fixed sheet
Data Source
AI summary
An image forming apparatus includes a main body, sheet discharge unit, fixing unit, and conveying guide. The fixing unit thermally fixes a developer image deposited on a sheet to provide an image-fixed sheet. The conveying guide defines at least a part of a conveying path. The conveying guide guides one surface of the image-fixed sheet. The conveying guide includes a fixed guide unit and movable guide unit. The fixed guide unit guides end portions of the image-fixed sheet in a widthwise direction orthogonal to a conveying direction of the image-fixed sheet. The fixed guide unit is immovable relative to the main body. The movable guide unit is disposed adjacent to the fixed guide unit in the widthwise direction and movable relative to the fixed guide unit. The movable guide unit guides the image-fixed sheet in a first position. The movable guide unit exposes the conveying path in a second position.