Developing Cartridge Pressure Member Placement
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Solution Overview
Problem
Conventional developing cartridges face interference issues when positioning a pressure member to press the developing roller against the photosensitive drum due to the presence of ribs and handles, which complicates the attachment and detachment process.
Innovation Solution
The developing cartridge design incorporates a casing with strategically positioned ribs, pressure members, and a handle, where the pressure members are placed between the ribs and handle to avoid interference, allowing for effective pressing of the developing roller against the photosensitive drum while ensuring proper alignment and attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the pressure member is positioned at the other side of the accommodation chamber in the second direction, then the developing roller can be pressed against the photosensitive drum, but the pressure member interferes with the rib and/or handle
Solution Approach 1:
The pressure member is divided into multiple segments or sections that can be positioned at different locations along the accommodation chamber. This segmentation allows the pressing function to be distributed across multiple points, enabling effective pressure application while avoiding interference with the rib and handle positioned at specific locations.
Solution Approach 2:
The pressure member is designed with varying properties along its length, with different sections having different characteristics. The portion that contacts the developing roller is optimized for pressing, while sections near the rib and handle are designed to avoid interference, creating local quality variations that resolve the contradiction between effective pressing and ease of operation.
2Ease of operation
If the pressure member is positioned to avoid interference with the rib and handle, then ease of operation is improved, but the pressing effectiveness may be reduced
Solution Approach 1:
The pressure member is designed to apply force not only in the primary pressing direction but also at angled orientations. By introducing dimensional variability in the force application vector, the pressure member can achieve effective pressing while navigating around the rib and handle obstacles, thus maintaining both ease of operation and pressing effectiveness.
Solution Approach 2:
An intermediary structure or mechanism is introduced between the pressure member and the developing roller. This intermediary can be a flexible element, a distributed contact surface, or a mechanical advantage system that amplifies the pressing force while allowing the pressure member to be positioned away from the rib and handle, thus resolving the contradiction between positioning for ease of operation and positioning for pressing effectiveness.
Data Source
AI summary
A developing cartridge includes a casing and a developing roller. The casing has an accommodation chamber, first and second ribs, a handle, and first and second pressure members. The accommodation chamber has one end portion and another end portion in a first direction, and an outer surface. The developing roller is positioned at one side of the accommodation chamber in a second direction. The ribs, the handle, and the pressure members are positioned at another side of the accommodation chamber in the second direction. The ribs and the pressure members are positioned at the outer surface. The handle is positioned between the first rib and the second rib in the first direction. The first pressure member is positioned between the handle and the first rib in the first direction. The second pressure member is positioned between the handle and the second rib in the first direction.