Single-Sided Cam Mechanism for Developing Roller Positioning
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Solution Overview
Problem
Conventional image-forming apparatuses require driving force to be transmitted to components on both sides of the drum unit or drum cartridge to move the developing roller between contact and separated positions, which complicates the mechanism and increases the number of required parts.
Innovation Solution
An image-forming apparatus with a developing cartridge that includes a rotatable developing roller, a casing, a first cam, and a pressing surface, where the first cam is pivotally movable to change the position of the pressing surface, allowing the developing roller to be moved between contact and separated positions with a driving force applied only to one side of the developing cartridge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving components are positioned at each side of the drum unit to move the developing roller, then the developing roller can be moved between contact and separated positions, but the device complexity increases and more parts are required
Solution Approach 1:
The patent extracts the driving function from both sides of the drum unit and concentrates it into a single driving portion on one side. The developing roller is moved by a cam mechanism that converts rotational motion into linear motion, eliminating the need for symmetric driving components on both sides. This extraction principle reduces device complexity while maintaining the reliability of developing roller movement between contact and separated positions.
2Manufacturing precision
If driving force is transmitted to components on both sides, then the developing roller can be positioned accurately, but the number of required parts increases
Solution Approach 1:
The patent merges the driving functions for both sides of the drum unit into a single driving portion. A cam mechanism with a single rotation axis simultaneously controls the developing roller's movement, consolidating multiple parts into one integrated system. This merging maintains positioning accuracy while reducing the quantity of parts required.
3Reliability
If components are positioned at each side of the drum unit, then the developing roller can be moved reliably, but the ease of operation decreases
Solution Approach 1:
The patent introduces a cam mechanism as an intermediary between the driving force source and the developing roller. The cam converts rotational motion into the required linear motion for moving the developing roller, simplifying the transmission path. This intermediary reduces the complexity of force transmission from both sides to a single side, improving ease of operation while maintaining reliable developing roller movement.
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
Simplifies the mechanism by allowing the developing roller to be moved between contact and separated positions with a single-sided driving force, reducing the number of required parts and improving operational efficiency.
Implementation Method 1
a first cam, and a pressing surface. The first cam is positioned at one end of the casing in the first direction. The first cam is pivotally movable about an axis extending in the first direction between a first position and a second position. The pressing surface is pivotable in accordance with pivotal movement of the first cam.
Data Source
AI summary
An image-forming apparatus includes a developing cartridge, a photosensitive drum, a drawer and a driving portion. The developing cartridge includes: a developing roller rotatable about an axis extending in a first direction; a casing; a first cam positioned at one end of the casing in the first direction; and a pressing surface pivotable in accordance with pivotal movement of the first cam. The drawer includes: a drawer frame to which the developing cartridge is detachably attachable; and a depressed surface with which the pressing surface is contactable. The driving portion is configured to pivotally move the first cam about an axis extending in the first direction. The pressing surface is configured to contact the depressed surface to move the developing roller from a contacting position in contact with the photosensitive drum to a separated position in separation from the photosensitive drum by the pivotal movement of the first cam.