Developer Cartridge Detection Gear and Sensor Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately determining the service life of developer cartridges with varying toner amounts, leading to potential deterioration of image quality and increased costs due to complex construction and space constraints.
Innovation Solution
An image forming apparatus with a detection mechanism that includes a drive member in the developer cartridge and a detection unit in the image forming apparatus body, utilizing a movement member and transmission member to detect the rotation of a detection gear, allowing for accurate judgment of the developer cartridge's status without increasing costs or size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a new cartridge detection unit with multiple sensors is used to detect developer cartridge status, then the detection accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines the new cartridge detection function and used cartridge detection function into a single detection sensor. The detection gear has a projection that can be detected by the same sensor in both new cartridge and used cartridge states, eliminating the need for separate sensors and reducing device complexity while maintaining detection accuracy
Solution Approach 2:
The detection sensor serves multiple functions: it detects both new cartridge status and used cartridge status through the same detection mechanism. The detection gear's projection is designed to interact with the sensor in different ways depending on cartridge state, making the sensor universal for both detection purposes
2Adaptability or versatility
If the developer cartridge is located in spaced relation from the image forming apparatus body, then the design flexibility is improved, but the detection mechanism complexity increases
Solution Approach 1:
The patent introduces an idler gear as an intermediary element to transmit rotational force from the detection gear to the sector gear when the developer cartridge is spaced from the apparatus body. This intermediary mechanism enables detection functionality while maintaining design flexibility for spacing arrangements
Data Source
AI summary
When a developer cartridge is mounted together with a drum unit in a main body casing, a detection gear is rotated by driving of a motor, and an abutment projection of the detection gear is brought into abutment against a lever of a drum subunit to move the lever. The movement of the lever is detected by an optical sensor. A CPU judges information on the developer cartridge on the basis of the results of the detection by the optical sensor. Therefore, the information on the developer cartridge can be judged with a simple construction at reduced costs. Further, the developer cartridge can be mounted in the main body casing in spaced relation, so that the design flexibility is increased.