Application Roller Resistance Detection in Image Forming Systems
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Solution Overview
Problem
In image forming systems, accurately detecting the resistance of recording materials is challenging due to the changing electric resistance of both the recording material and the conductive elastic rollers, such as conductive rubber, when the applied voltage varies.
Innovation Solution
The system includes an application roller that applies a voltage to the recording material and a controller that calculates the resistance of the recording material based on first and second profile information. The first profile information is acquired by changing the applied voltage without the recording material sandwiched, while the second profile information is acquired with the recording material sandwiched, both corresponding to changes in the resistance of the application roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive elastic roller such as conductive rubber is used to sandwich the recording material for resistance detection, then the recording material can be stably sandwiched between the rollers, but the electric resistance of the roller changes according to the applied voltage, making it difficult to maintain a constant voltage across the recording material and accurately detect its resistance
Solution Approach 1:
The system performs preliminary resistance detection at a first applied voltage to acquire first detection results, then uses these results to calculate a correction coefficient that compensates for the voltage-dependent resistance change of the conductive roller. This preliminary action allows the system to establish a correction factor before actual measurement, eliminating the measurement error caused by roller resistance variation.
Solution Approach 2:
The system changes the applied voltage from a first voltage to a second voltage and observes the change in detection results. By analyzing how the detection results vary with voltage, the system calculates a correction coefficient that accounts for the roller's resistance characteristics at different voltages, thereby enabling accurate resistance measurement despite the roller's varying resistance.
2Adaptability or versatility
If the applied voltage is changed to detect resistance when the detection current is equal to or less than a reference, then the resistance detection can be performed for materials with higher resistance, but the voltage applied to the recording material becomes non-constant due to the roller's resistance change, preventing accurate resistance detection
Solution Approach 1:
The system uses the first detection results obtained at the first applied voltage as feedback to calculate a correction coefficient. This correction coefficient is then applied to the second detection results obtained at the second applied voltage, compensating for the roller resistance change and enabling accurate resistance measurement across different voltage conditions and material types.
Solution Approach 2:
The system deliberately changes the applied voltage between first and second voltage levels to perform detection at multiple operating points. By analyzing the detection results across these different voltage parameters and applying a correction coefficient, the system achieves both high adaptability to different resistance values and high measurement precision.
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 method allows for accurate detection of the resistance of the recording material by maintaining a constant measurement reference voltage, thereby overcoming the challenge of varying resistance due to applied voltage changes.
Implementation Method 1
the electric resistance of the conveyance roller for resistance detection changes according to the applied voltage
Data Source
AI summary
Provided is an image forming system capable of accurately detecting the resistance of a recording material. The image forming system includes an application roller that applies a voltage to a recording material on a conveyance path, and a controller that calculates the electric resistance of the recording material from a relationship between the voltage applied to the application roller and a current. The controller calculates the resistance of the recording material based on first profile information that is acquired by changing the applied voltage and corresponds to a change in the resistance of the application roller, and second profile information that is acquired by changing the applied voltage in a state where the recording material is sandwiched and corresponds to the change in the resistance of the application roller.