Belt Driving Control Stabilizing Speed Variations
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Solution Overview
Problem
Existing belt driving control systems for image forming apparatuses face challenges in maintaining stable speed variations due to belt thickness changes, leading to image quality degradation and increased memory requirements for speed profile data, which results in high costs and complex data management.
Innovation Solution
A belt driving control apparatus that includes a mark detection system, angular displacement error detection, and computing components to calculate correction data for stabilizing speed variations, using a non-volatile memory to store phase and amplitude data, and a volatile memory to store correction data for real-time control, allowing for precise feedback control without the need for high-resolution belt thickness measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-resolution belt thickness measurement and speed profile data storage are implemented, then speed variation stability improves, but memory requirements and system cost increase
Solution Approach 1:
The patent extracts only the essential characteristics (phase and amplitude) from the complex belt thickness profile data. Instead of storing and processing complete high-resolution speed profile data, the system identifies and stores merely the phase and amplitude parameters that characterize the thickness variations, dramatically reducing memory requirements while maintaining control effectiveness
Solution Approach 2:
The patent transforms the control approach by changing from storing complete speed profile data to storing simplified parameters (phase and amplitude). This parameter transformation allows the system to represent complex thickness variations using minimal data, reducing memory burden while enabling effective compensation through calculated correction values
2Measurement precision
If complete belt thickness profile data is stored and processed, then speed control precision improves, but data management complexity increases
Solution Approach 1:
The system extracts only the critical features (phase and amplitude) from the complete belt thickness profile, eliminating the need to manage and process large volumes of raw data. This extraction approach maintains speed control precision by focusing on the parameters that actually influence speed variations
Solution Approach 2:
Instead of using complete thickness profile data to control speed, the patent inverts the approach by using minimal parameters (phase and amplitude) to generate correction values. This inversion simplifies data management while achieving the same control objective through a different computational pathway
3Speed
If proportional control with feed-back is used to maintain constant belt speed, then speed control responsiveness improves, but image quality degrades due to minute thickness variations
Solution Approach 1:
The patent applies preliminary action by pre-calculating correction values based on the phase and amplitude of belt thickness variations. These correction values are prepared in advance and applied to the proportional control output, compensating for thickness variation effects before they degrade image quality
Solution Approach 2:
The patent introduces correction values as an intermediary element between the proportional control system and the actual belt speed control. These correction values mediate the control action by compensating for thickness variation effects, allowing the responsive proportional control to maintain image quality despite minute thickness changes
Data Source
AI summary
A belt driving control apparatus, the belt driving control apparatus having an endless belt, a driving roller driving the endless belt, a driving motor driving the driving roller, at least one idler roller being dependent on the endless belt, and an encoder attached to one idler roller. The belt driving control apparatus includes a structure where a control target value of the driving motor is set so that an effective speed of the endless belt is constant and the driving motor is drive-controlled so that the control target value is satisfied.