Detachable Unit Grip With Perpendicular Pressed Face
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in smooth removal of detachable units, such as the photosensitive drum and developing unit, due to the oblique insertion/removal trajectory and lack of intuitive grip mechanisms, leading to potential scratching and difficulty in handling.
Innovation Solution
The design incorporates a grip portion with a pressed face perpendicular to the removal direction, a first side extending along the lower-end edge, and a second side along the upper-end edge, featuring a finger insertion portion and ribs for anti-slip functionality, guiding the operator to remove the unit along the correct trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a detachable unit is designed with an oblique insertion/removal trajectory to save space, then the unit housing becomes more compact, but the removal operation becomes difficult and may cause scratching
Solution Approach 1:
A guide portion is introduced as an intermediary mechanism between the detachable unit and the main body. The guide portion includes a guide groove formed in the main body and a corresponding guide protrusion on the detachable unit, which work together to constrain the removal motion to the correct oblique trajectory, preventing scratching while maintaining compact design
Solution Approach 2:
The guide portion structure enables the detachable unit to self-align and self-guide during removal. The guide protrusion automatically follows the guide groove trajectory without requiring external guidance or complex mechanisms, making the system self-sufficient in maintaining proper removal path
2Device complexity
If no grip mechanism is provided, then the unit housing structure remains simple, but the user cannot easily grasp and remove the unit
Solution Approach 1:
The grip portion is designed with locally differentiated surface properties. The first surface has a roughened texture providing high friction for finger grip, while the second surface remains smooth for aesthetic and ergonomic reasons. This local quality differentiation enables effective gripping without adding complex mechanical structures
Solution Approach 2:
The grip portion is segmented into functionally distinct surfaces: a first surface specifically designed for finger contact with roughened texture, and a second surface with different properties. This segmentation allows each surface to optimize its function without compromising the other
3Device complexity
If the pressed face is not perpendicular to the removal direction, then the grip portion structure is simpler, but the removal force cannot be effectively applied along the trajectory
Solution Approach 1:
The pressed face is designed with a specific geometric parameter - being perpendicular to the removal direction. This parameter optimization ensures that the force applied by the user's finger is efficiently transmitted along the removal trajectory, maximizing removal effectiveness while maintaining structural simplicity
Data Source
AI summary
A detachable unit has a unit housing and a grip portion thereon. The detachable unit is insertable and removal along an insertion/removal trajectory formed inside the body of an image forming apparatus and forming a depression angle as seen from the removal direction. The grip portion has a pressed face facing the upstream side of the unit housing in its removal direction and substantially perpendicular to the insertion/removal trajectory, a first side extending along the lower-end edge of the pressed face, and a second side extending along the upper-end edge of the pressed face. No face extending on the upstream side of the unit housing in the removal direction connects to the first side, and a finger insertion portion into which a finger can be inserted from the side of the first side along the pressed face is formed in the first side.