Image Forming Apparatus Toner Concentration Detection
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Solution Overview
Problem
Existing image forming apparatuses face challenges in determining the need for service calls due to variations in toner concentration, leading to potential machine stoppages and inefficiencies, as current methods rely on static threshold values and do not account for process speed variations effectively.
Innovation Solution
The image forming apparatus includes a processor that operates the processing unit at varying speeds to acquire toner concentration detection values from an ATC sensor, using a threshold value table to determine whether a service call is necessary, allowing for dynamic adjustment of process speed based on toner concentration and preventing unnecessary machine stoppages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If static threshold values are used to determine service call necessity, then the determination process is simple, but the detection accuracy is insufficient due to not accounting for process speed variations
Solution Approach 1:
The patent applies dynamics by making the determination process adaptive rather than static. The controller dynamically adjusts the service call determination based on process speed variations. Specifically, when process speed varies, the controller modifies how threshold values are applied to ATC sensor outputs, ensuring accurate toner concentration assessment across different operating conditions without requiring a completely complex new system.
Solution Approach 2:
The patent changes parameters by introducing process speed as a variable factor in the service call determination. Instead of using fixed threshold values alone, the system now considers process speed variations and adjusts the determination criteria accordingly. This allows the same hardware to achieve higher detection accuracy by dynamically adjusting the evaluation parameters based on actual operating conditions.
2Productivity
If process speed is increased to improve productivity, then output increases, but toner concentration variations become more significant leading to inaccurate service call determination
Solution Approach 1:
The patent implements feedback by continuously monitoring process speed and using this information to adjust the service call determination process. The controller receives feedback about speed variations and modifies its threshold evaluation accordingly. This feedback loop ensures that even at high productivity speeds, the toner concentration detection remains accurate by compensating for speed-induced variations in the ATC sensor output.
3Reliability
If service call determination is delayed until critical thresholds are reached, then fewer false alarms occur, but machine stoppages and user disruption increase
Solution Approach 1:
The patent applies preliminary action by enabling earlier detection of toner concentration abnormalities through the process speed-aware determination method. By accounting for speed variations in the threshold evaluation, the system can identify potential issues before they reach critical levels that would cause machine stoppages. This preliminary detection allows for proactive maintenance scheduling, reducing both false alarms and actual downtime by intervening before critical failures occur.
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 approach enables earlier detection of toner concentration abnormalities, reducing the likelihood of urgent machine stoppages and improving operational efficiency by determining the need for service calls before critical thresholds are reached, thus minimizing user disruption.
Implementation Method 1
A magnetic sensor called an auto toner control (ATC) sensor is used to detect the toner concentration. The ATC sensor has, for example, a coil and detects and outputs a voltage value generated in this coil and changing according to a density of a magnetic flux from the toner.
Data Source
AI summary
An image forming apparatus includes a processing unit, a sensor, and a processor. The processing unit has a developing device using a developer containing two components of a toner and a carrier. The sensor outputs a detection value corresponding to a toner concentration of the developer during operation of the processing unit. The processor performs a process of determining whether a service call to a service person is necessary based on the detection value of the sensor. The processor operates the processing unit at either a high process speed or a low process speed to acquire the detection value of the sensor, before determining whether the service call is necessary. The processor determines the process speed at which the processing unit is to be operated based on the detection value. The processor operates the processing unit at the determined process speed to determine whether the service call is necessary.