Rotary Developer Cartridge Detection for Correct Color Attachment
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Solution Overview
Problem
In some color image forming apparatuses, attaching a developer container of the wrong color to a developing device leads to the supply of incorrect developer, which is not effectively addressed by existing technologies.
Innovation Solution
The image forming apparatus includes a rotary with separate developing chambers for different developers, trays that support cartridges and move between positions, and a detector system that generates distinct currents upon contact to ensure correct cartridge attachment, preventing wrong developer containers from being attached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple attachment structure is used for developer containers, then the cost of the developer container is reduced, but the risk of attaching the wrong color developer container increases
Solution Approach 1:
The patent applies local quality by providing distinct contact portions (first contact portion for yellow, second contact portion for magenta, third contact portion for cyan) on the developer containers, each with unique electrical connection characteristics. This localized differentiation enables the image forming apparatus to identify the correct container type through electrical detection, ensuring reliable matching without complicating the overall container structure or increasing costs significantly.
2Reliability
If a detection system is added to verify correct cartridge attachment, then the reliability of developer supply is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical verification mechanisms with an electrical detection system. Instead of using mechanical interlocks, physical keys, or complex positioning mechanisms to ensure correct cartridge attachment, the system uses electrical contacts and detection circuits to identify the cartridge type. This substitution maintains high reliability while minimizing added complexity, as the detection integrates into existing electrical pathways.
Solution Approach 2:
The detection system serves multiple functions: it identifies the cartridge type (yellow, magenta, cyan), verifies correct attachment, and can potentially trigger appropriate processing modes. By making the detection system multi-functional, the patent reduces the need for separate verification mechanisms, thereby limiting the increase in device complexity while maintaining comprehensive reliability.
3Measurement precision
If distinct contact portions are provided for different cartridge types, then the precision of cartridge identification is improved, but the manufacturing cost of cartridges increases
Solution Approach 1:
The patent changes the electrical parameters (conductivity, connection configuration) of the contact portions on the cartridges to enable identification. Instead of using complex mechanical features, visual codes, or RFID tags that would increase manufacturing complexity and cost, the system relies on simple electrical property variations. This approach achieves high identification precision while keeping the manufacturing process relatively simple and costs low.
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 solution effectively prevents wrong developer containers from being attached while minimizing the increase in costs associated with developer containers.
Implementation Method 1
in a case where the first contact portion has come into contact with the third contact portion, a first current is generated in the circuit, and the detector detects a signal that is based on the first current, after the second cartridge supported by the first tray has started to move from the first position to the second position, a second contact portion included in the second cartridge comes into contact with the third contact portion, and in a case where the second contact portion has come into contact with the third contact portion, a second current is generated in the circuit, and the detector detects a signal that is based on the second current
Data Source
AI summary
An image forming apparatus has a rotary supporting the first and second cartridges each displaced between two positions, and a detector connected to a circuit including a third contact portion. After the first cartridge has started to move from the first position to the second position, a first contact portion in the first cartridge comes into contact with the third contact portion. When the first contact portion has come into contact with the third contact portion, the detector detects a signal generated in the circuit. After the second cartridge has started to move from the first position to the second position, a second contact portion in the second cartridge comes into contact with the third contact portion. When the second contact portion has come into contact with the third contact portion, the detector detects a signal generated in the circuit.