Cartridge Assembly Cover Limiting Photosensitive Drum Movement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The longitudinal movement of a photosensitive drum during transportation or storage of a process cartridge can cause triboelectric charging, leading to image defects such as horizontal streaks, and may result in parts breaking due to impact, as the existing clearance allows the charging member to rub against the drum.
Innovation Solution
A cartridge assembly with a cover member that is attachable and detachable to the frame, featuring a limiting rib to restrict the photosensitive drum's movement in the longitudinal direction, reducing the clearance and preventing excessive rubbing and impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the photosensitive drum is installed with a longitudinal clearance relative to the frame, then the drum can stably rotate during printing and accommodate variations in dimensions and heat shrinkage, but the charging member may move through the clearance and rub against the photosensitive drum during transportation, causing triboelectric charging and image defects
Solution Approach 1:
A limiting member is introduced as an intermediary component between the photosensitive drum and the frame. This limiting member restricts the longitudinal movement of the photosensitive drum to a predetermined amount, preventing the charging member from rubbing against the drum surface during transportation while still allowing sufficient clearance for stable rotation during printing operations.
2Stability of the object's composition
If the photosensitive drum is installed with a longitudinal clearance relative to the frame, then the drum can stably rotate during printing, but the parts may break due to the impact caused by the movement of the parts during transportation
Solution Approach 1:
The limiting member acts as a protective intermediary that constrains the photosensitive drum's longitudinal movement. By restricting the drum to move only within a predetermined small amount, the limiting member prevents excessive impact during transportation that could cause breakage, while maintaining enough clearance for the drum to rotate stably during printing operations.
3Manufacturing precision
If the charging member moves through the clearance and rubs against the photosensitive drum, then triboelectric charging occurs causing horizontal streaks, but increasing the clearance worsens the rubbing and charging issues
Solution Approach 1:
The limiting member serves as a mediator that precisely controls the longitudinal movement of the photosensitive drum. It restricts the drum's movement to a predetermined amount that is sufficient to prevent triboelectric charging and horizontal streaks in images, while avoiding excessive restriction that would interfere with stable rotation during printing.
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 effectively limits the longitudinal movement of the photosensitive drum, reducing the occurrence of triboelectric charging and potential damage, thereby enhancing image quality and preventing mechanical issues during transportation and storage.
Implementation Method 1
there is a possibility that the charging member may move through the clearance and rub against the photosensitive drum during transportation. In some cases, triboelectric charging occurs on the photosensitive drum, which may cause image defects such as horizontal streaks.
Data Source
AI summary
In a cartridge assembly, a cartridge frame is configured to limit a movable amount of a photosensitive drum with respect to the frame in a longitudinal direction of the photosensitive drum to a first amount in the case where a cover member is apart from the frame, and the cover member has a held portion held by the frame and a limiting portion configured to limit the movable amount of the photosensitive drum with respect to the frame to a second amount smaller than the first amount by contacting with a longitudinal end surface of the photosensitive drum in the case where the photosensitive drum moves in the longitudinal direction when the cover member is mounted on the frame.