Developing Cartridge Window Member Support via Frame Extension
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Solution Overview
Problem
It is challenging to support a window member at the side surface of a developing cartridge's first frame when it is positioned closer to the second frame, due to limited space and the presence of other operational members, making it difficult to detect the residual developing agent effectively.
Innovation Solution
The window member is supported by an extension provided at the second frame, allowing it to be positioned at the side surface of the first frame without requiring additional support between the first wall and the extension, thus enabling detection of the developing agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the window member is disposed at a position closer to the bottom surface of the developing cartridge than the agitator, then it can detect the residual amount of developing agent, but it is difficult to detect an amount of developing agent floated by the agitator via the window member
Solution Approach 1:
The patent transitions from a single detection position to multiple detection positions arranged in different spatial dimensions. Specifically, it provides a first detection window at the lower portion and a second detection window at the upper portion of the developing cartridge, enabling detection of both settled and floated developing agent through multi-dimensional spatial arrangement.
2Measurement precision
If a window member is disposed at a position closer to the second frame than the agitator, then it can detect floated developing agent, but various members required to operate the developing cartridge are disposed at a side surface of the first frame, making it difficult to provide a structure for supporting a window member
Solution Approach 1:
The second frame is designed to serve multiple functions: it acts as both the cover for the first frame and as a support structure for the detection windows. The second frame includes extensions that protrude toward the first frame, which simultaneously serve as mounting structures for both the upper detection window and other operational members, thereby reducing overall device complexity.
Solution Approach 2:
The detection window support structure is segmented and distributed: the lower detection window is supported by the first frame, while the upper detection window is supported by extensions of the second frame. This segmentation allows each frame to support detection windows at appropriate positions without interfering with each other's functional members.
3Measurement precision
If the window member is positioned at the side surface of the first frame, then it can detect developing agent, but space in the side surface of the first frame is limited due to other operational members
Solution Approach 1:
The patent utilizes the vertical dimension by providing detection windows at both the lower portion (supported by first frame) and upper portion (supported by second frame extensions) of the developing cartridge. This vertical segmentation effectively utilizes the limited side surface area of the first frame while maintaining detection capabilities.
Data Source
AI summary
A developing cartridge includes a casing configured to hold developing agent therein, a developing roller rotatably supported by the casing, the developing roller configured to rotate about a first axis, an agitator configured to agitate the developing agent in the casing and to rotate about a second axis and a window member disposed around a through hole. The casing includes a first frame including a first wall having the through hole and a second wall spaced apart from the first wall and a second frame that contacts the first wall and the second wall and includes an extension extending along an outer surface of the first wall. The window member is disposed between the second axis and the second frame. The window member is also disposed between the first wall and the extension and supported by the first wall and the extension.