Developing Device Pressure Sensor for Toner Flowability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In image forming apparatuses, the deterioration or shortage of toner can lead to decreased flowability of the developer, causing development defects such as image density decline and uneven density, which existing technologies fail to detect and address effectively.
Innovation Solution
A developing device equipped with a container, a developing roller, a trimmer, and pressure sensors located upstream of the photoconductor, which detect the pressure caused by the developer to determine its state and trigger appropriate treatment methods, such as toner replenishment or discharge, to maintain optimal developer flowability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If toner is used continuously in the developer, then productivity is maintained, but toner deterioration occurs leading to decreased flowability and development defects
Solution Approach 1:
The pressure sensor detects changes in developer pressure before toner deterioration significantly impacts development quality. By monitoring pressure trends upstream of the photoconductor, the system can predict toner state changes and trigger preventive maintenance actions, avoiding development defects before they occur
Solution Approach 2:
The system continuously monitors developer pressure and uses this feedback to determine toner state. When pressure changes indicate toner deterioration or shortage, the system automatically responds by controlling the toner supply mechanism to replenish or discharge toner, maintaining optimal developer flowability throughout continuous operation
2Device complexity
If existing detection methods are used, then device complexity is minimized, but detection precision of toner state is insufficient leading to undetected development defects
Solution Approach 1:
The pressure sensor acts as an intermediary measurement device that indirectly detects toner state by measuring developer pressure. This indirect measurement approach provides sufficient detection precision for toner deterioration and shortage without requiring complex direct observation systems, maintaining simplicity while achieving reliable detection
Solution Approach 2:
The invention replaces complex mechanical or optical detection systems with a simple pressure sensing mechanism. By measuring pressure changes in the developer flow upstream of the photoconductor, the system achieves accurate toner state detection using a straightforward mechanical measurement approach
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
The system effectively detects pressure changes to determine the developer's state, enabling timely interventions like toner replenishment or discharge, thereby preventing development defects and ensuring consistent image quality by addressing toner-related issues.
Implementation Method 1
a detector provided in the trimmer or in the vicinity of the trimmer of the inner surface of the container to detect the pressure caused by the developer
Data Source
AI summary
Provided is a developing device including a container that contains developer; a developing roller that transports the developer within the container to a photoconductor side; a trimmer having a tip brought close to the developing roller, and provided upstream of the photoconductor in a transporting direction by the developing roller; and a detector provided in the trimmer or in the vicinity of the trimmer of the inner surface of the container to detect the pressure caused by the developer.