Image Forming Apparatus Toner Adhesion Feedback Control
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Solution Overview
Problem
Existing image forming apparatuses face challenges in maintaining stable image density during continuous printing due to difficulties in optimizing transfer pressure, leading to reduced productivity and image quality.
Innovation Solution
An image forming apparatus that includes a first transfer device, a second transfer device, a transfer-pressure changer, and an adhesion-amount detector, which calculates a variable value for toner adhesion based on detected and target values, correcting the detection value to adjust image-forming conditions, thereby stabilizing image density regardless of transfer pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transfer pressure is changed in sheet interval to maintain productivity, then productivity is improved, but image density stability deteriorates
Solution Approach 1:
The system uses an adhesion-amount detector to detect the amount of toner adhering to the second mover, and a controller calculates a correction amount based on the difference between detected and target values. This feedback mechanism allows the system to automatically adjust image forming conditions (such as developing bias voltage or toner supply amount) to compensate for transfer pressure changes, thereby maintaining stable image density while enabling productivity improvement through pressure variation.
Solution Approach 2:
The invention changes the approach by dynamically adjusting image forming parameters (such as developing bias voltage, toner concentration, or exposure amount) based on detected adhesion amounts, rather than trying to maintain constant transfer pressure. This allows the system to accommodate transfer pressure variations while maintaining consistent image quality through compensatory parameter adjustments.
2Reliability
If transfer pressure is kept constant to maintain image density stability, then image density stability is improved, but productivity deteriorates
Solution Approach 1:
The feedback mechanism enables the system to detect deviations from target image density caused by constant pressure conditions and automatically adjust image forming parameters to compensate, thereby maintaining productivity through dynamic optimization while preserving image density stability.
Solution Approach 2:
The system transitions from static constant pressure control to dynamic pressure and parameter control, where image forming parameters are continuously adjusted based on real-time detection of toner adhesion amounts, enabling the system to optimize both productivity and image quality under varying operational conditions.
3Device complexity
If detection value is used directly for image forming control, then control simplicity is improved, but image quality deteriorates due to transfer pressure variations
Solution Approach 1:
The controller calculates a correction amount based on the difference between the detected adhesion amount and the target adhesion amount, then applies this correction to adjust image forming conditions. This feedback-based correction mechanism maintains control simplicity while significantly improving image quality by compensating for transfer pressure variations.
Solution Approach 2:
The system replaces direct mechanical transfer pressure control with an informational feedback loop that uses optical or electrical detection of adhesion amounts to control image forming parameters, substituting a complex mechanical pressure control system with a more flexible sensor-based control system.
Data Source
AI summary
An image forming apparatus includes an image forming device, a first transfer device including a first mover, a second transfer device including a second mover, a transfer-pressure changer, a detector, and circuitry. The detector detects a toner image and outputs a detection value indicating an amount of toner of the toner image adhering to the second mover. The circuitry calculates a variable value for the amount of toner varying with a change in a transfer pressure, based on the detection value and a target value of the amount of toner of the toner image to be transferred and adhere to the second mover, reflects the calculated variable value in the detection value to correct the detection value, adjusts an image-forming condition based on the corrected detection value, and sets the image-forming condition of the toner image in the image forming device based on the corrected detection value.