Image Forming Apparatus With Transfer Unit Tray Support
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Solution Overview
Problem
Existing image forming apparatuses face challenges in supporting detachable cartridges with a simple structure, particularly in preventing the tray from sagging under the weight of the cartridge.
Innovation Solution
The apparatus includes a supported unit with a primary transfer roller and an intermediate transfer belt, which is supported by a secondary transfer unit when outside the apparatus main body, allowing for a simple structure to support the tray.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connecting arms are used to support the tray when pulled out, then the tray is prevented from sagging, but the structure becomes more complex
Solution Approach 1:
The transfer unit is designed to serve multiple functions: it acts as both a transfer mechanism for the intermediate transfer belt and a support structure for the tray when pulled out. By integrating the support function into the existing transfer unit, the patent eliminates the need for separate connecting arms while maintaining tray stability, thus resolving the contradiction between reliability and device complexity
Solution Approach 2:
The patent merges the support function with the transfer unit by positioning the transfer unit below the intermediate transfer belt. This integration allows the transfer unit to simultaneously perform its transfer function and provide structural support for the tray, reducing the overall number of components and simplifying the support structure
2Ease of repair
If the tray is pulled out to allow cartridge access, then maintenance becomes easier, but the tray may sag and damage the drum surface
Solution Approach 1:
The transfer unit acts as an intermediary support structure between the tray and the apparatus main body. When the tray is pulled out for cartridge maintenance, the transfer unit provides intermediate support to prevent the tray from sagging excessively, thereby protecting the drum surface from damage while still allowing easy cartridge access
Solution Approach 2:
The transfer unit is positioned in advance below the intermediate transfer belt to provide preemptive support for the tray during extraction. This beforehand positioning prevents the tray from sagging beyond safe limits before any potential drum contact can occur, cushioning against harmful effects while enabling maintenance operations
Data Source
AI summary
An image forming apparatus includes an apparatus main body, a supported unit movable relative to the apparatus main body to an inside position inside the apparatus main body and an outside position outside the apparatus main body, the supported unit including a primary transfer roller, an intermediate transfer belt, and a photosensitive member, an opening/closing member movable relative to the apparatus main body to a closed position and an open position retracted from the closed position, the opening/closing member being configured to block a movement path for the supported unit, and a transfer unit having a secondary transfer roller. When the supported unit is at the inside position, the intermediate transfer belt is positioned below the photosensitive member, and when the supported unit is at the outside position, the supported unit is supported by the transfer unit, and the transfer unit is positioned below the intermediate transfer belt.