Charge Eliminating Apparatus Feedback Control for Static Charge
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Solution Overview
Problem
Existing charge-eliminating apparatuses struggle to maintain an appropriate charge-eliminated state and charged state of sheets due to changes in the resistance value of the charge-eliminating roll, leading to inefficient static charge elimination.
Innovation Solution
A charge-eliminating apparatus that includes a charge-eliminating member, a power supply, a current detection circuit, and a control unit. The control unit adjusts the voltage applied to the charge-eliminating member based on the detected current, ensuring the current falls within a predetermined range, and also considers environmental conditions to adjust the target current value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charge-eliminating roll is continuously energized, then the charge elimination function is maintained, but the resistance value of the roll changes making it difficult to appropriately adjust charge states
Solution Approach 1:
The patent implements a feedback control mechanism where a current detection circuit continuously monitors the current flowing through the charge-eliminating roll. The control unit adjusts the voltage applied to the roll based on the detected current value, ensuring the current remains within a predetermined range. This closed-loop feedback system automatically compensates for resistance changes, maintaining reliable charge elimination while eliminating manual adjustment needs.
Solution Approach 2:
The patent dynamically changes the operating parameters (voltage and current) of the charge-eliminating roll based on detected conditions. By monitoring the current and adjusting the voltage accordingly, the system adapts to resistance value changes over time, maintaining optimal charge elimination performance without requiring manual intervention or fixed parameter settings.
2Device complexity
If the voltage applied to the charge-eliminating member is fixed, then the control system is simple, but the current cannot be maintained within the optimal range when resistance changes
Solution Approach 1:
The patent employs a feedback control system where the current detection circuit continuously measures the actual current through the charge-eliminating member. The control unit compares this measured current with the target current range and dynamically adjusts the voltage output to maintain the current within the optimal range, ensuring reliable operation despite resistance variations.
Solution Approach 2:
The control system performs self-adjustment by automatically modifying the voltage based on real-time current measurements. This self-service mechanism eliminates the need for external manual intervention or complex external control systems, maintaining current precision through autonomous feedback-based voltage regulation.
3Productivity
If environmental conditions are not considered, then the control process is simpler, but the charge elimination effectiveness varies with environmental changes
Solution Approach 1:
The patent incorporates environmental condition detection (such as humidity and temperature sensing) that provides advance information about environmental factors affecting charge elimination. The control unit uses this preliminary environmental data to proactively adjust the voltage and current parameters before performance degradation occurs, maintaining effectiveness while integrating environmental compensation into the control process.
Solution Approach 2:
The system dynamically changes operating parameters (voltage, current, target current range) based on detected environmental conditions. By adapting parameters to environmental variations such as humidity and temperature changes, the patent maintains consistent charge elimination effectiveness across different environmental conditions through parameter optimization.
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 solution allows for more precise control of static charge elimination, ensuring that sheets are effectively de-charged without sticking due to electrostatic adsorption, even when the resistance value of the charge-eliminating roll changes.
Implementation Method 1
a charge-eliminating member configured to come into contact with a sheet and eliminate static charges from the sheet
Data Source
AI summary
A charge-eliminating apparatus includes a charge-eliminating member configured to come into contact with a sheet and eliminate static charges from the sheet, a power supply configured to apply a voltage to the charge-eliminating member, a current detection circuit configured to detect a current flowing through the charge-eliminating member, and a control unit configured to control a value of the voltage by the power supply, based on a detection result obtained by the current detection circuit when the sheet passes over the charge-eliminating member, such that the current falls within a predetermined range with respect to a target value, wherein the control unit acquires a detection result of an environment detection sensor that detects an environmental condition, and wherein the control unit changes the target value based on the detection result of the environment detection sensor during execution of a job that eliminates static charges.