Belt Unit Replacement via Drawer Mechanism
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Solution Overview
Problem
Conventional color printers are cumbersome due to the difficulty in dismounting the belt unit from the main casing, particularly because the image forming unit is large and heavy, and the intermediate transfer roller complicates this process, making maintenance and replacement challenging.
Innovation Solution
The design incorporates a drawer unit and a secondary transfer unit within the main casing, allowing the belt unit to be easily mounted and dismounted through a dedicated channel, eliminating the need for complete removal of the image forming unit and simplifying the process by using a separation mechanism for the secondary transfer roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the image forming unit is dismounted from the main casing to replace the belt unit, then the belt unit can be replaced, but the operation becomes cumbersome due to the large size and heavy weight of the image forming unit
Solution Approach 1:
The patent divides the image forming device into separate functional modules: the image forming unit (with photosensitive drums and developing rollers) and the belt unit (with intermediate transfer belt and support rollers). This segmentation allows the belt unit to be independently accessed and replaced without removing the entire image forming unit, reducing the weight and complexity of the component that must be handled during maintenance.
Solution Approach 2:
The belt unit is extracted as a separate, independently removable component from the main casing. The opening in the main casing is designed to allow direct access to the belt unit without requiring removal of the image forming unit. This extraction principle enables maintenance personnel to replace only the belt unit (a lighter component) rather than the entire heavy image forming assembly.
2Reliability
If the intermediate transfer roller is present in the belt unit, then image transfer function is improved, but the belt unit becomes difficult to dismount from the main casing
Solution Approach 1:
The intermediate transfer roller is integrated into the belt unit as a sub-component rather than being a separate fixed element in the main casing. This segmentation allows the entire belt unit (including the roller) to be removed as one assembly through the opening, simplifying the dismounting process while maintaining the image transfer function.
Solution Approach 2:
The intermediate transfer roller is combined with the belt unit structure, where the roller is positioned to work with the intermediate transfer belt within the same removable assembly. This merging allows both components to be installed and removed together, eliminating the need for complex disassembly operations and improving ease of maintenance while preserving the image transfer functionality.
Data Source
AI summary
An image forming device includes, a main casing, a drawer unit, and a transfer unit. The main casing has a first frame formed with a first opening and a second frame formed with a second opening. The main casing has a first inner space in communication with the first opening and the second opening. The drawer unit is movable between a first position and a second position. The drawer unit is accommodated in the first inner space when the drawer unit is in the first position. The drawer unit is partially drawn out from the first inner space through the first opening when the drawer unit is in the second position. When the drawer unit is moved to the second position, a mounting space is formed for allowing the first transfer unit to be mounted in the second inner space.