Image Forming Unit Locking Mechanism for Secure Mounting
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Solution Overview
Problem
Existing image forming units face issues with the locking mechanism between the covering member and the main assembly, leading to unintentional disengagement during insertion, exposure of image formation members, and difficulties in inserting the unit due to locking failures.
Innovation Solution
An image forming unit with a movable locking portion that is configured to move from a locking position to an unlocking position during the mounting process, allowing for secure locking and easy dismounting without requiring unit movement during the mounting operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the covering member is locked with the main assembly when the unit is set in the insertion position, then the covering member is prevented from unintentional disengagement, but the locking cannot be released until the unit is mounted to the predetermined position, causing inability to remove wrong units and exposure of image formation members
Solution Approach 1:
The locking portion is designed to move between locked and unlocked positions automatically based on the insertion depth of the unit. When the unit is at the insertion position, the locking portion is in the locked position to prevent unintentional disengagement. When the unit is fully inserted to the predetermined position, the locking portion automatically transitions to the unlocked position, enabling removal of wrong units while maintaining protection during insertion.
2Ease of operation
If the locking between covering member and main assembly is released at any time, then easy removal is enabled, but the covering member may disengage during unit insertion, causing exposure of image formation member
Solution Approach 1:
The locking portion dynamically adjusts its state based on insertion depth. During the insertion process, the locking portion remains in the locked position to ensure the covering member stays attached and protects the image formation member. Only after full insertion to the predetermined position does the locking portion transition to the unlocked position, enabling safe removal.
3Reliability
If the locking mechanism is engaged during insertion, then secure mounting is achieved, but insertion difficulty increases due to locking interference
Solution Approach 1:
The locking portion is designed to engage automatically after the unit has been fully inserted to the predetermined position, rather than during the insertion process itself. This preliminary locking action ensures secure mounting while avoiding interference with the insertion operation, as the locking engagement occurs only after insertion is complete.
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3(a)~3(b)
AI summary
An image forming unit (100) mountable to an image forming apparatus (1) includes a main assembly including an image bearing drum (11) and insertable into the apparatus; a cover portion (200) engaging with the main assembly of the unit to cover the drum; an inserting portion (204) provided on the cover portion for insertion into the apparatus; a movable locking portion (210) for locking the cover portion with the apparatus; and a moving mechanism (600) for moving the locking portion to a locking position after the cover portion is mounted to the apparatus, and the main assembly of the unit is inserted into the apparatus by a predetermined amount from an insertion starting position, and for moving the locking portion from the locking position an unlocking position before completion of mounting of the main assembly of the unit to the apparatus.