Process Frame Lever Locking Mechanism for Drum Unit Positioning
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Solution Overview
Problem
Existing image forming apparatuses face challenges in securely positioning units due to shock or movement, as traditional boss-and-U-shaped-gap mechanisms are prone to detachment, making attachment and detachment labor-intensive and unreliable.
Innovation Solution
The apparatus incorporates a process frame with supporting parts that restrict movement of units along specific directions, using lever members and locking mechanisms to securely engage and lock the units in place, preventing detachment during shocks or movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inlet of the U-shaped gap is formed smaller than the diameter of the positioning boss and the boss is lightly press-fitted to the U-shaped gap, then the positioning reliability is improved, but the attaching and detaching process becomes time-consuming and labor-intensive
Solution Approach 1:
The supporting part is designed with a movable portion that can shift between a first position (for easy attachment) and a second position (for secure positioning). During attachment, the movable portion is at the first position allowing the positioning boss to pass freely. After attachment, it moves to the second position to restrict movement of the positioning boss, thus achieving both easy attachment and reliable positioning without press-fitting
Solution Approach 2:
The solution adds a spatial dimension to the positioning mechanism by introducing a movable portion that shifts positions. The movable portion can move along the installation direction, creating two distinct states: an open state for attachment and a restricted state for secure positioning. This dimensional movement resolves the contradiction between easy attachment and secure retention
2Stability of the object's composition
If the inlet of the U-shaped gap is formed smaller than the diameter of the positioning boss to prevent detachment, then the positioning stability is improved, but the device complexity increases
Solution Approach 1:
Instead of using a fixed complex structure with a smaller inlet, the patent employs a dynamic movable portion that shifts between positions. This movable portion is driven by a simple spring mechanism or gravity, avoiding the need for complex interlocking structures while achieving stable positioning through positional change rather than structural complexity
Solution Approach 2:
The movable portion automatically moves to the appropriate position based on the presence or absence of the drum unit. When the drum unit is installed, the movable portion is pushed to the first position; when removed, it returns to the second position. This self-adjusting mechanism eliminates the need for complex control systems or manual adjustment
Data Source
AI summary
An image forming apparatus includes a drum unit supporting a photosensitive drum, a development unit forming a toner image on the photosensitive drum and a process frame. In the process frame, after the drum unit is installed along a predetermined installation direction, the development unit is installed along the installation direction. The process frame includes a pair of two supporting parts supporting a pair of two supported parts provided in the development unit. One supporting part is configured so as to support one supported part along a direction intersecting the installation direction and to restrict movement of the one supported part along the installation direction. Other supporting part is configured to restrict movement of other supported part along the installation direction when, after the other supported part is supported along the installation direction, the drum unit is installed to the process frame.