Developing Device Port Positioning for Toner Leakage Control
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Solution Overview
Problem
Existing electrophotographic image forming apparatuses face challenges in preventing toner leakage and scattering during the replacement of toner replenishing and developer collecting units, which can lead to user exposure and equipment noise from motor components.
Innovation Solution
The developing device is designed with the receiving and discharge ports positioned at the end of the developing tank in the longitudinal direction, and the motor and drive input portion are located on the rear side to minimize noise transmission and toner leakage, with the toner replenishing and developer collecting units attached in a detachable manner to extend along the apparatus main body, allowing for controlled feeding and collection of toner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the receiving port and discharge port are provided in the front end portion of the developing device, then the toner replenishing and collecting units can be easily attached and detached from the front side, but toner leakage and scattering occur during unit replacement
Solution Approach 1:
The receiving port and discharge port are extracted from the front end portion and relocated to the end portion in the longitudinal direction of the developing tank. This separation removes the harmful toner leakage zone from the user-facing front area, allowing easy unit attachment while preventing toner scattering during replacement operations.
Solution Approach 2:
The port locations are moved from the front-end horizontal arrangement to the longitudinal end portion, utilizing the depth dimension of the developing tank. This dimensional repositioning places ports away from the front attachment path, eliminating toner exposure risks while preserving operational ease.
2Object-affected harmful factors
If the motor and drive input portion are provided on the rear side to suppress noise transmission, then machinery sounds are reduced, but the drive input portion requires precise alignment with the motor
Solution Approach 1:
The drive system is segmented into distinct functional zones: the motor is positioned on the rear side for noise isolation, while the drive input portion is positioned at the longitudinal end of the developing tank. This segmentation allows noise suppression while the port alignment features provide inherent positioning accuracy.
Solution Approach 2:
The drive input portion acts as an intermediary mechanism between the motor and the rotators. Its positioning at the longitudinal end creates a natural alignment path that mediates the connection, reducing the need for high-precision manual alignment while maintaining effective power transmission.
3Object-affected harmful factors
If the receiving port, discharge port, and drive input portion are positioned at the longitudinal end of the developing tank, then toner leakage is suppressed during unit replacement, but the internal space arrangement becomes more complex
Solution Approach 1:
The receiving port, discharge port, and drive input portion are merged and co-located at the longitudinal end of the developing tank. This consolidation groups multiple functions at a single strategic location, suppressing toner leakage while actually simplifying the internal space arrangement by reducing the number of separate access points required.
Data Source
AI summary
A developing device develops, with developer, an electrostatic latent image formed on an image carrying member, and includes a developing tank, a developer carrying member, and a drive input portion. The developing tank stores the developer and has a receiving port and a discharge port through which the developer is received and discharged respectively. The developer carrying member rotates in the developing tank while carrying the developer. The drive input portion receives a rotational force from outside the developing device and transmit the rotational force to a driven rotation shaft that is a rotation shaft of the developer carrying member. The receiving port, the discharge port, and the drive input portion are provided in the developing tank to be close to an end of the developing tank in a longitudinal direction of the developing tank.