Shutter and Pressing Mechanism for Developing Roller Attachment
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Solution Overview
Problem
The existing image forming apparatuses face issues such as damage to the developing unit or photoreceptor during replacement and generation of image defects due to improper contact or separation of the developing roller and photoreceptor.
Innovation Solution
An improved image forming apparatus structure that includes a shutter unit to control the light scanning unit's operation, allowing for precise attachment and detachment of the developing roller to the photoreceptor, utilizing a pressing assembly with link units and elastic members to manage the contact and separation process, ensuring proper alignment and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the developing roller and photoreceptor are kept in contact during replacement, then the image forming operation can be maintained, but damage to the developing unit or photoreceptor occurs
Solution Approach 1:
The shutter unit is opened in advance before the developing unit is detached, and the developing roller is separated from the photoreceptor beforehand. This preliminary action prevents damage during replacement while allowing the image forming operation to resume quickly after reattachment, resolving the contradiction between operational continuity and damage prevention.
2Reliability
If the developing roller is separated from the photoreceptor for replacement, then damage is prevented, but image defects are generated due to improper separation state
Solution Approach 1:
The shutter unit acts as an intermediary mechanism that controls the light path between the light scanning unit and the photoreceptor. When the developing roller is separated for replacement, the shutter unit opens to allow light to pass through, preventing image defects. This mediator enables both damage prevention and image quality maintenance during the separation state.
3Device complexity
If a simple pressing structure is used for attachment, then device complexity is reduced, but precise alignment and controlled separation cannot be achieved
Solution Approach 1:
The pressing units are merged with the shutter unit operation through the operating unit. A single operating unit controls both the pressing action for precise alignment of the developing roller with the photoreceptor and the shutter opening/closing action. This combined structure achieves precise alignment control without requiring separate complex mechanisms, resolving the contradiction between simplicity and precision.
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
Prevents malfunction and image defects by ensuring accurate attachment and detachment of the developing roller to the photoreceptor, enhancing the operational reliability and reducing the risk of damage during maintenance.
Implementation Method 1
a pressing elastic member which generates a pressing force at the pressing position
Data Source
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AI summary
Disclosed herein is an image forming apparatus. The image forming apparatus includes a light scanning unit including a light source which generates light to form an electrostatic latent image by applying the light onto the photoreceptor, and a window through which the light generated by the light source is transmitted, a shutter unit which opens and closes the window, a plurality of pressing units which are provided to allow pressing the developing unit and the shutter unit for an operation of attaching or detaching the developing roller to or from the photoreceptor and an operation of opening and closing the shutter unit and are disposed and spaced in a longitudinal direction, and an operating unit movably provided between an operating position at which a pressing force of the plurality of pressing units is generated, and a standby position at which the pressing force is released. By this configuration, an operation of opening and closing the shutter unit is allowed to link with an operation of attaching or detaching the developing roller to or from the photoreceptor.