Detachable Developing Cartridge for Drum Protection
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Solution Overview
Problem
Current image forming apparatuses face challenges in efficiently replacing and accessing jammed sheets of recording medium without increasing the size of the device, as they require removing the entire cartridge, which is inefficient and can damage the photosensitive drum.
Innovation Solution
The image forming apparatus features a cartridge mounting-dismounting mechanism that allows the development cartridge to be independently replaced across the recording medium conveyance passage without removing the drum cartridge, using a rotating cover to access the conveyance passage and a cartridge guide that switches positions for mounting and dismounting, enabling easy access and replacement without enlarging the apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the entire cartridge is removed to access the recording medium conveyance passage, then the jammed sheet can be removed, but the photosensitive drum may be damaged and the operation becomes inefficient
Solution Approach 1:
The cartridge is divided into two separable units: a drum cartridge containing the photosensitive drum and a development cartridge containing the development roller. This segmentation allows the development cartridge to be removed independently to access the conveyance passage for jammed sheet removal, while the drum cartridge remains in place, preventing drum damage.
Solution Approach 2:
The development cartridge is extracted as a separate removable unit from the main cartridge assembly. This extraction enables direct access to the recording medium conveyance passage through the opening provided by removing the development cartridge, allowing jammed sheets to be removed without taking out the entire cartridge or exposing the photosensitive drum.
2Productivity
If components different in service life are placed in different units, then replacement efficiency improves, but the device structure becomes more complex
Solution Approach 1:
The cartridge is segmented into a drum cartridge and a development cartridge as separate mountable units. This segmentation allows components with different service lives (photosensitive drum and development roller) to be replaced independently, improving replacement efficiency while maintaining a relatively simple overall structure through standardized mounting interfaces.
3Ease of operation
If a door is provided to access the conveyance passage, then jammed sheet removal is easier, but the apparatus size increases
Solution Approach 1:
Instead of providing a separate door structure to access the conveyance passage, the development cartridge itself is designed to be removable. When removed, it provides direct access to the conveyance passage, eliminating the need for an additional door and avoiding increase in apparatus size.
Data Source
AI summary
An image forming apparatus for forming an image on a recording material includes a drum cartridge including an image bearing member, a developing cartridge including a developing unit for developing the image formed on the image bearing member, and a cartridge mounting member to which the drum cartridge and the developing cartridge are detachably mountable. In addition, a transferring unit transfers a visualized image on the image bearing member onto the recording material fed along a feeding path, and an opening and closing cover is provided across the feeding path from the image bearing member. A path of removing the detachable developing cartridge is accessed by opening the opening and closing cover and extends across the feeding path so as to permit the developing cartridge to pass through the feeding path without removing the drum cartridge.