Image Forming System Toner-Based Charging Control
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Solution Overview
Problem
Existing image forming systems face issues with defective stacking of electrically charged paper sheets due to repulsion and attraction forces, as existing charging technologies cannot accurately charge all surfaces of the paper sheets prior to stacking.
Innovation Solution
An image forming system that includes a toner amount sensing device and a charging device, where a control unit reads the paper sheet to determine the toner amount on both surfaces and adjusts the charging voltage accordingly, using independent current values for charging rollers to ensure appropriate charging across all surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a charging unit applies correction voltage to paper sheets prior to stacking, then paper sheet charging is improved, but appropriate charging cannot be performed on all surfaces of the paper sheet due to limited sensing capability
Solution Approach 1:
The charging unit is divided into multiple independent charging rollers (first charging roller and second charging roller) that can be independently controlled. Each charging roller corresponds to a specific surface of the paper sheet, allowing independent charging control for each surface based on toner amount sensing results.
Solution Approach 2:
Different charging voltages are applied to different surfaces of the paper sheet based on the local toner amount on each surface. The first charging roller applies voltage based on toner amount on the first surface, while the second charging roller applies voltage based on toner amount on the second surface, achieving localized quality control.
2Manufacturing precision
If independent current values are applied to charging rollers, then charging precision across all surfaces is improved, but device complexity increases
Solution Approach 1:
The charging system uses feedback from toner amount sensing devices that read the paper sheet after image formation. The sensed toner amount information is fed back to the control unit, which adjusts the charging voltage of each charging roller accordingly, creating a closed-loop control system that improves precision without excessive complexity.
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 precise electrical charging of paper sheets, preventing bonding and repulsion between sheets and thus avoiding defective stacking by ensuring accurate toner distribution and surface potential control.
Implementation Method 1
a charging unit that electrically charges the paper sheet having the image formed thereon by the image forming apparatus
Implementation Method 2
a reading unit that reads the paper sheet having the image formed thereon by the image forming apparatus
Implementation Method 3
mutual attraction occurs between the positive charge E21 and the negative charge E12, between the negative charge E12 and the positive charge E11, and between the positive charge E11 and the negative charge E22
Data Source
AI summary
An image forming system includes: an image forming apparatus configured to form an image on a paper sheet; a toner amount sensing device including a reading unit configured to read the paper sheet having the image formed thereon by the image forming apparatus; a charging device including a charging unit configured to electrically charge the paper sheet having the image formed thereon by the image forming apparatus; and a control unit configured to acquire an amount of toner adhering to the paper sheet by reading the paper sheet with the reading unit, and control the charging unit based on the amount of toner.