Latent-Image Writing Unit Positioning Mechanism
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Solution Overview
Problem
Conventional electrophotographic image forming apparatuses face accuracy issues due to backlash and jouncing of the latent-image writing unit, leading to reduced positioning accuracy and potential damage during maintenance operations.
Innovation Solution
The apparatus incorporates a holder that moves between positions to hold the latent-image writing unit, allowing free movement and using an urging unit to bring the held portion into contact with a contact target portion, thereby constraining movement and maintaining accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the latent-image writing unit is moved together with the opening/closing cover, then maintenance accessibility is improved, but positioning accuracy deteriorates due to backlash and jouncing
Solution Approach 1:
The invention divides the movement system into two independent parts: the opening/closing cover moves separately from the latent-image writing unit. The writing unit is mounted on a dedicated moving unit that can be retracted independently, allowing maintenance access without compromising positioning accuracy through relative movement between components.
Solution Approach 2:
A moving unit acts as an intermediary mechanism between the opening/closing cover and the latent-image writing unit. This intermediate structure enables the writing unit to be retracted when the cover opens, providing maintenance access while maintaining precise positioning through controlled movement and contact mechanisms.
2Ease of repair
If the latent-image writing unit is held to allow free movement, then maintenance accessibility is improved, but reliability deteriorates due to potential damage from back action
Solution Approach 1:
The invention applies preliminary anti-action by providing a contact target portion that preemptively prevents harmful back action. When the opening/closing cover moves, the held portion contacts this predetermined target portion, which counteracts and prevents damaging movements or vibrations before they can cause harm to the latent-image writing unit.
Solution Approach 2:
The contact target portion serves as a cushioning element that absorbs and dissipates mechanical shocks and vibrations. By providing this predetermined contact point, the system cushions against sudden movements or back action forces, protecting the latent-image writing unit from damage while still allowing free movement for maintenance.
3Manufacturing precision
If the held portion is brought into contact with the contact target portion, then positioning accuracy is improved, but device complexity increases due to additional urging mechanism
Solution Approach 1:
The urging unit operates on a self-service principle, utilizing the natural movement and gravity of the opening/closing cover to automatically bring the held portion into contact with the contact target portion. This automatic engagement eliminates the need for complex active control systems, maintaining positioning accuracy while minimizing additional structural complexity.
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 solution enhances maintenance accessibility by preventing backlash-induced damage and maintaining writing position accuracy, improving the overall reliability and precision of the image forming process.
Implementation Method 1
This image forming apparatus uses a spring to urge the latent-image writing unit in a predetermined direction while holding the latent-image writing unit to allow its free movement by using the opening/closing cover.
Data Source
AI summary
An image forming apparatus includes a cover frame that holds a held shaft of an optical writing unit to allow a free movement thereof and urges the optical writing unit in a predetermined direction by using an urging coil spring to bring the held portion shaft of the optical writing unit separated from the writing operation position into contact with a contact target portion thereof.