Electrostatic Collecting Device Charge Saturation Management
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Solution Overview
Problem
Existing electrostatic collecting devices face challenges in improving collection performance due to charge saturation on the collecting unit, such as a brush roller, which limits the effectiveness of electrostatic attraction and collection of objects from the surface of objects to be cleaned.
Innovation Solution
The electrostatic collecting device incorporates a charging unit with an insulating member that rubs against the collecting unit to charge it, and a charge removing unit that contacts the charging unit to remove excess charge, thereby increasing the charge quantity on the collecting unit and enhancing collection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a charging unit is provided to increase charge quantity on the brush roller, then collection performance is improved, but the charge quantity becomes saturated and collection performance cannot be improved further
Solution Approach 1:
The charging unit is divided into multiple independent charging rollers that can be arranged in series or parallel configurations. Each charging roller independently charges the brush roller, allowing incremental charge buildup without saturation. The segmentation enables multiple charging zones along the brush roller surface, ensuring uniform charge distribution and preventing local charge saturation.
Solution Approach 2:
An intermediary charging roller made of insulating material is introduced between the power supply and the brush roller. This intermediary roller receives charge from the power supply through contact and then transfers it to the brush roller through controlled rubbing. The intermediary acts as a charge mediator that prevents direct charge saturation by regulating the charge transfer process and distributing charge more evenly.
2Quantity of substance
If the number of times of rubbing is increased to improve charge quantity, then charge quantity increases, but charge saturation occurs and collection performance plateaus
Solution Approach 1:
The rubbing pressure and speed between the charging unit and brush roller are made dynamically adjustable. By controlling the normal force and relative speed, the charge transfer rate can be optimized in real-time. The system dynamically adapts the rubbing conditions to maintain efficient charge transfer without exceeding the brush roller's charge capacity, preventing saturation while maximizing collection performance.
Solution Approach 2:
The electrical parameters of the charging system are changed by using multiple charging rollers with different voltage levels or charge densities. This allows progressive charging in stages, where each charging roller contributes a controlled amount of charge. The parameter changes prevent charge saturation by distributing the total charge across multiple controlled increments rather than a single excessive charge event.
3Device complexity
If a simple configuration is used without high voltage, then device complexity is reduced, but charge quantity on collecting unit is insufficient
Solution Approach 1:
Multiple charging rollers are merged into a single integrated charging unit assembly that works together as one system. The combined charging unit maintains a simple overall configuration while internally utilizing multiple charging elements. This merging approach achieves sufficient charge quantity through cumulative charge transfer from multiple rollers without requiring complex high-voltage systems or separate charging mechanisms.
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 configuration allows for improved collection performance by maintaining a stable positive charge on the brush roller, effectively increasing the amount of toner or dust collected from the surface of the object to be cleaned, as demonstrated in the verification of effects where no streaky toner loss occurred and cleaning performance was maintained even under tough conditions.
Implementation Method 1
a charging unit having an insulating member rubbing against the collecting unit and charging the collecting unit by the insulating member
Implementation Method 2
a charge removing unit contacting a surface of the charging unit, electrically grounded to remove charge from the surface of the charging unit, and having a conductive brush, charge removing needle, or conductive sheet contacting the charging unit
Implementation Method 3
a collecting unit facing a surface of an object to be cleaned, electrostatically collecting objects to be collected existing on the surface of the object to be cleaned
Data Source
AI summary
An electrostatic collecting device including a collecting unit facing a surface of an object to be cleaned, electrostatically collecting objects to be collected existing on the surface of the object to be cleaned, and having a rotating body and a brush provided on a surface of the rotating body; a charging unit having an insulating member rubbing against the collecting unit and charging the collecting unit by the insulating member; and a charge removing unit contacting a surface of the charging unit, electrically grounded to remove charge from the surface of the charging unit, and having a conductive brush, charge removing needle, or conductive sheet contacting the charging unit.