Belt Deviation Correction Using Dynamic Control Tables
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Solution Overview
Problem
Existing image forming apparatuses require longer times to stabilize the belt due to inappropriate control values when the belt ages, as the relationship between deviation and control amounts changes with belt deterioration, leading to suboptimal correction.
Innovation Solution
An image forming apparatus with a control section that adjusts the amount of control based on actual belt behavior by creating a correction table from measured data, allowing for appropriate deviation correction regardless of belt age.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a correction table prepared in advance is used for deviation correction, then the control system is simple and easy to operate, but the correction becomes inappropriate when the belt ages, requiring longer stabilization time
Solution Approach 1:
The control section performs preliminary measurement of the relationship between control amount and belt position change before actual deviation correction, and stores this measured data as a correction table. This preliminary action ensures the correction table reflects the actual belt characteristics, enabling appropriate correction from the start without requiring extended stabilization time.
Solution Approach 2:
The system uses feedback from the detection section that detects the actual position of the belt to create an accurate correction table. The control section measures the actual belt behavior in response to control inputs and uses this feedback information to establish the correction relationship, ensuring the correction adapts to the actual belt state rather than relying on predetermined theoretical values.
2Device complexity
If a fixed correction table is used without updating, then the control system remains simple, but the relationship between control amount and belt behavior changes with belt aging, leading to inappropriate correction values
Solution Approach 1:
The correction table is made dynamic by allowing it to be updated based on actual measurements. The control section can remeasure the relationship between control amount and belt position change and update the correction table accordingly. This dynamic approach ensures the correction remains accurate even as the belt ages and its characteristics change, without requiring complex predictive models.
Solution Approach 2:
The system changes the parameters of the correction table based on actual measurements. By measuring the actual belt response to control inputs and updating the correction table with these measured parameters, the system adapts to changes in belt characteristics over time, maintaining correction accuracy without increasing overall device complexity.
Data Source
AI summary
An image forming apparatus includes: a rotating belt which rotates around a roller; a drive section which rotates the belt; a detection section which detects a position of the belt in a width direction; a moving section which moves the belt in the width direction; a control section which corrects a deviation of the belt by controlling the moving section. The control section conducts a preparatory operation in which the control section changes an amount of control to be given to the moving section under the condition where the belt is rotated to obtain a correction data showing a relation between the amount of control and a change of a position of the belt in the width direction detected by the detection section, stores the correction data in a memory section, and then corrects the deviation based on the correction data stored in the memory section.