Process Cartridge Guide Layout for Jammed Sheet Extraction
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Solution Overview
Problem
Conventional image forming devices require users to manually remove jammed sheets from the main casing by reaching inside, which is cumbersome due to the sheet being released at an acute angle relative to the sheet passage.
Innovation Solution
The image forming device is designed with a process cartridge that can be attached and detached through an upward-opening main casing, featuring guides and conveyer rollers that facilitate the removal of jammed sheets by guiding the cartridge and sheet together out of the casing, with the transfer member urging toward the photosensitive body to maintain the nip during detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the process cartridge is detached from the main casing by moving at an acute angle relative to the sheet passage, then the detachment operation is simplified, but the jammed sheet remains in the main casing requiring manual removal
Solution Approach 1:
The patent combines the process cartridge movement path with the sheet passage alignment. By configuring the guide members and process cartridge movement path such that the cartridge moves substantially perpendicular to the sheet passage during detachment, the sheet is naturally guided out together with the cartridge. This merging of movement paths ensures that sheet removal is integrated with cartridge detachment, eliminating the need for separate manual sheet removal operations.
Solution Approach 2:
The patent introduces guide members as intermediary components that mediate between the process cartridge and the main casing. These guide members constrain and guide the movement of the process cartridge during detachment, ensuring it follows a path perpendicular to the sheet passage. This intermediary mechanism ensures proper alignment and movement control, enabling the sheet to be extracted together with the cartridge without manual intervention.
2Productivity
If the sheet passage is configured to allow acute angle detachment, then cartridge replacement is faster, but sheet removal becomes cumbersome requiring hand intervention
Solution Approach 1:
The patent merges the functions of cartridge detachment and sheet removal into a single integrated action. By configuring the guide members and movement path so that the process cartridge moves perpendicular to the sheet passage during detachment, the sheet is automatically guided out along with the cartridge. This integration eliminates the need for separate sheet removal operations, maintaining fast cartridge replacement while simplifying sheet removal to a natural byproduct of the detachment process.
Solution Approach 2:
The patent enables the system to perform sheet removal automatically during cartridge detachment without requiring manual hand intervention. The guide members and perpendicular movement configuration create a self-service mechanism where the sheet is naturally extracted as the cartridge is removed, utilizing the detachment motion itself to accomplish both cartridge replacement and sheet clearance functions.
3Device complexity
If the process cartridge moves at an acute angle during detachment, then the structural design is simpler, but mechanical interference occurs during sheet extraction
Solution Approach 1:
The patent inverts the conventional detachment angle from acute to perpendicular (substantially 90 degrees) relative to the sheet passage. This inversion of the movement direction fundamentally changes the extraction dynamics, allowing the sheet to be guided out smoothly together with the cartridge without mechanical interference. The perpendicular movement path creates a more favorable geometric relationship between the sheet passage and cartridge movement, eliminating interference issues.
Solution Approach 2:
The patent employs guide members as intermediary components that mediate the movement of the process cartridge during detachment. These guide members constrain the cartridge to move perpendicular to the sheet passage, ensuring proper alignment and preventing mechanical interference. The guide members act as intermediaries that translate the detachment motion into a path that naturally clears the sheet without collision or interference with other components.
Data Source
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AI summary
An image forming device includes a main casing, a process cartridge, a sheet passage, and a first guide. The process cartridge includes a photosensitive body, and a transfer member, and is configured to be attachable to and detachable from the main casing. The sheet passage extends in a first direction and is configured to allow a sheet to pass between the photosensitive body and the transfer member. The first guide is configured to guide the process cartridge such that the process cartridge is attachable to and detachable from the main casing. The first guide has a support portion extending in a second direction substantially perpendicular to the first direction and configured to support the process cartridge in a state where the process cartridge is attached to the main casing.