Secondary Transfer Unit Positioning for Cover Interference
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Solution Overview
Problem
Conventional electrophotographic image forming apparatuses face challenges in reducing the size of the cover while maintaining workspace when opened, as the secondary transfer unit protrudes, potentially interfering with the intermediate transfer unit, leading to increased installation space requirements.
Innovation Solution
The image forming apparatus incorporates a pivoting cover with a guiding portion and engaging mechanisms that adjust the relative position of the secondary transfer unit using self-weight and biasing springs, allowing the secondary transfer unit to change its position relative to the cover, preventing interference with the intermediate transfer unit when the cover is opened.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the secondary transfer unit protrudes greatly from the cover to engage the pivot center with the main body, then the transfer rollers can be locked against the intermediate transfer belt, but the intermediate transfer unit may interfere with the protruding secondary transfer unit when removed
Solution Approach 1:
The secondary transfer unit is designed to change its position dynamically based on cover state. When the cover is closed, the secondary transfer unit protrudes to engage the pivot center with the main body for reliable transfer roller locking. When the cover is opened, the secondary transfer unit retracts to prevent interference with the intermediate transfer unit removal. This dynamic position adjustment resolves the contradiction between engagement reliability and interference prevention.
2Object-affected harmful factors
If the rotation center of the cover is established in the lower part of the main body to lower the protruding position of the secondary transfer unit, then interference with the intermediate transfer unit is avoided, but the cover grows in size and spreads sideways greatly
Solution Approach 1:
Instead of statically lowering the cover rotation center to avoid interference, the invention uses a dynamic approach where the secondary transfer unit changes its position based on cover state. The secondary transfer unit protrudes when the cover is closed for engagement, and retracts when the cover is opened to avoid interference. This eliminates the need to enlarge the cover area by shifting the rotation center downward.
3Ease of operation
If the secondary transfer unit always protrudes greatly from the cover to ensure easy engagement, then the pivot center engages easily with the main body, but the installation space increases due to cover size expansion
Solution Approach 1:
The secondary transfer unit transitions from a static protruding state to a dynamic state that adjusts based on cover position. When the cover is closed, the secondary transfer unit protrudes to facilitate easy engagement of the pivot center with the main body. When the cover is opened, the secondary transfer unit retracts to minimize the cover's effective area and reduce installation space requirements. This dynamic adjustment resolves the contradiction between engagement ease and cover area reduction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for the suppression of cover size increases, securing workspace above the cover when opened, and enabling easy attachment and detachment of the intermediate transfer unit without damaging the intermediate transfer belt, thus reducing installation space requirements and improving operational ease.
Implementation Method 1
a biasing spring configured to bias the secondary transfer unit so as to protrude toward the main body from the cover is provided between the cover and secondary transfer unit
Implementation Method 2
when the cover is moved from an intermediate position between the closed position and the open position to the open position, a relative position of the secondary transfer unit with respect to the cover is changed by using a self-weight of the secondary transfer unit
Data Source
AI summary
An image forming apparatus includes: a cover configured to be pivotal between a closed position and an open position to open an opening portion through which an intermediate transfer unit is removable, wherein when the cover is moved from an intermediate position to the open position, a secondary transfer unit is changed by using a self-weight of the secondary transfer unit from a first relative position to a second relative position, and wherein when the cover is located in the open position and the intermediate transfer unit is supported in a first position by a guiding portion, a secondary transfer unit interferes with the intermediate transfer unit if located in the first relative position, but does not interfere with the intermediate transfer unit if located in the second relative position.