Restricting Members Prevent Cartridge Detachment in Drum Units
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Solution Overview
Problem
In tandem type color printers, developing cartridges can be accidentally detached from the image forming position due to shocks applied when the drum unit is moved from the drawn-out position to the housing position, leading to potential disruptions in the image forming process.
Innovation Solution
The implementation of restricting members that are initially retracted from the attachment path when the holding member is drawn out but advance to restrict the cartridges from detachment as the holding member moves back to the housing position, ensuring the cartridges remain securely attached during movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the drum unit is vigorously moved from the drawn-out position to the housing position, then the image forming operation can be quickly initiated, but a large shock is applied to the drum unit and developing cartridge causing potential detachment
Solution Approach 1:
The restricting member is positioned in advance to prevent detachment before it can occur during vigorous movement of the drum unit. By having the restricting member already in place at the housing position, the system counteracts the shock-induced detachment force before it can separate the developing cartridge from the image forming position.
Solution Approach 2:
The restricting member acts as an intermediary element between the developing cartridge and the housing structure. It provides a mechanical constraint that mediates the shock forces during drum unit movement, preventing direct transmission of impact forces that would cause cartridge detachment while allowing normal attachment and detachment operations.
2Reliability
If the restricting member is always positioned to restrict cartridge movement, then cartridge detachment is prevented, but cartridge attachment and detachment operations are impeded
Solution Approach 1:
The restricting member is designed to be dynamically positioned only when needed - specifically at the housing position during image forming operations. The member can be retracted or moved away from the attachment path when cartridges need to be attached or detached, providing conditional restriction that adapts to operational requirements rather than constant restriction.
Solution Approach 2:
The restricting member is positioned in advance at the housing position before the drum unit is vigorously moved into place. This preliminary positioning ensures protection is already in place when the shock occurs, rather than reacting after detachment has been initiated. The restricting member is prepared beforehand to counteract the expected shock forces.
Data Source
AI summary
An image forming apparatus includes: a body; a holding member movable between a housing position and a drawn-out position; a plurality of cartridges configured to be attached to the holding member along a attachment path, so that the plurality of cartridges are placed at image forming positions and are arranged in a movement direction of the holding member; and a plurality of restricting members disposed correspondingly with the cartridges. In a state where the holding member is drawn out to the drawn-out position, the plurality of restricting members are located at unrestricted positions that are retracted from the attachment path. In an attachment process in which the holding member is moved from the drawn-out position to the housing position, the plurality of restricting members advance from the unrestricted positions to restricting positions on the attachment path to restrict the cartridges from being detached from the image forming positions.