Developing Unit Stopper Mechanism for Stable Transport Orientation
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Solution Overview
Problem
Existing image forming apparatuses face issues where the developing unit, when attached to the apparatus body without the photosensitive member unit, can take an unexpected orientation due to lack of proper positioning, leading to potential collisions during transportation or handling.
Innovation Solution
Incorporation of a pressure member and a stopper mechanism with an urging member to ensure the developing unit is properly positioned relative to the photosensitive member unit, using a stopper member that moves between regulating and retracting positions based on the attachment status of the photosensitive member unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the developing unit is attached to the apparatus body without the photosensitive member unit, then the door can be closed, but the developing unit takes an unexpected orientation and may collide with other units during transportation
Solution Approach 1:
The stopper member is positioned in advance to prevent the pressing member from moving to the pressing position when the photosensitive member unit is absent. This preliminary blocking action occurs before the door closing process, ensuring that the developing unit cannot be pressed into an incorrect orientation, thus allowing door closure while maintaining orientation stability.
Solution Approach 2:
The stopper member acts as an intermediary between the pressing member and the developing unit. When the photosensitive member unit is not attached, the stopper member intercepts the pressing member's movement, preventing direct pressure on the developing unit. This intermediary mechanism enables door closure while protecting the developing unit from improper positioning and potential collisions.
2Reliability
If the stopper member is positioned to prevent pressing when the photosensitive member unit is absent, then the developing unit orientation is ensured, but the door cannot be closed
Solution Approach 1:
The stopper member is designed to be dynamically positionable between a blocking position and a retracted position. When the photosensitive member unit is absent, the stopper member is positioned to block the pressing member, preventing incorrect pressing and ensuring developing unit orientation. When the photosensitive member unit is present, the stopper member is retracted to allow normal door closing. This dynamic positioning resolves the contradiction by adapting the stopper's function based on the attachment status.
Solution Approach 2:
The position parameter of the stopper member is changed based on the presence or absence of the photosensitive member unit. When the photosensitive member unit is absent, the stopper member is positioned at the blocking position to prevent pressing. When the photosensitive member unit is present, the stopper member's position parameter is changed to the retracted position, allowing door closure. This parameter change enables the system to maintain orientation stability while preserving door closing capability.
3Productivity
If the pressing member is allowed to move to the pressing position without restriction, then the developing unit can be pressed toward the photosensitive member unit, but the developing unit may collide with other units during transportation when the photosensitive member unit is not attached
Solution Approach 1:
The stopper member provides preliminary anti-action by blocking the pressing member's movement to the pressing position when the photosensitive member unit is absent. This preliminary prevention occurs before any pressing action can take place, counteracting the potential harmful effect of incorrect pressing that would lead to developing unit collision during transportation. When the photosensitive member unit is present, the stopper member allows normal pressing operation, maintaining productivity.
Solution Approach 2:
The stopper member converts the potential harm of restricted pressing into a benefit by using the same pressing mechanism to achieve dual functionality: when the photosensitive member unit is present, pressing is allowed for normal operation; when absent, the stopper member's blocking action becomes a protective feature that prevents collision. This transforms the limitation into a safety mechanism that protects the developing unit while maintaining operational efficiency.
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 the developing unit from colliding with other units during transportation by ensuring stable orientation, even when the photosensitive member unit is not attached, thus protecting the apparatus components.
Implementation Method 1
an urging member configured to urge the stopper member
Data Source
AI summary
An image forming apparatus includes an apparatus body, a photosensitive member unit, a developing unit, a pressing member movable between a first position for pressing the developing unit and a second position for releasing pressure, a stopper member movable between a regulating position for preventing the pressing member from moving from the second position to the first position and a retracting position for permitting the pressing member to move from the second position to the first position, and an urging member configured to urge the stopper member, wherein, in a case where the developing unit and the photosensitive member unit are attached to the apparatus body, the stopper member is at the retracting position, and wherein, in a case where the developing unit is attached to the apparatus body and the photosensitive member unit is not attached to the apparatus body, the stopper member is at the regulating position.