Intermediate Transfer Belt Steering System for Registration Accuracy
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Solution Overview
Problem
Existing electrostatic printing devices with single belt steering systems fail to maintain accurate lateral alignment of an endless intermediate transfer belt (ITB) as it passes through multiple imaging stations and the belt-to-print medium transfer station, leading to image-on-print medium and color-to-color registration errors.
Innovation Solution
Implementing multiple belt steering systems with multiple steering rollers and sensors to measure and correct the lateral position of the ITB at various locations, allowing independent or dependent control of the rollers based on sensor data to maintain alignment, and optionally configuring one roller as a drive roller to optimize space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single belt steering system is used to correct lateral position at one location, then the device complexity is reduced, but the manufacturing precision of lateral alignment is insufficient to maintain accuracy through multiple imaging stations and transfer stations
Solution Approach 1:
The patent divides the single steering system into multiple independent steering systems, with each system consisting of a steering roller and corresponding sensor at different locations around the belt circumference. This segmentation allows each local steering mechanism to independently maintain lateral alignment at its specific position, thereby improving overall manufacturing precision without requiring a single complex centralized system.
Solution Approach 2:
Each steering system is designed with local autonomy, where the steering roller and sensor at each location operate independently to correct lateral position deviations specific to that position on the belt. This local quality approach ensures that each segment of the belt maintains proper lateral alignment as it passes through different imaging stations and transfer stations, addressing the precision requirements at each specific location.
2Manufacturing precision
If multiple belt steering systems are implemented to maintain lateral alignment at multiple locations, then the manufacturing precision of lateral alignment is improved, but the device complexity increases
Solution Approach 1:
The steering system is segmented into multiple identical or similar modular units, each consisting of a steering roller, sensor, and control mechanism at different locations around the belt. This modular segmentation allows the system to achieve high lateral alignment precision through multiple independent correction points while managing complexity through standardized repeating units rather than a single complex integrated system.
Solution Approach 2:
Each steering system unit serves multiple functions: it measures lateral position at its location, corrects alignment deviations, and can be controlled independently or cooperatively with other units. This multi-functionality at each module level allows the overall system to maintain precision across multiple locations while the universal design of each module helps manage system complexity through repetition and standardization.
3Ease of operation
If steering mechanisms are controlled independently at each location, then the ease of operation is improved through localized control, but the reliability of overall belt alignment may be reduced due to lack of coordinated control
Solution Approach 1:
The control system allows dynamic operation modes where steering rollers can be controlled independently for simple localized corrections, or coordinated cooperatively to address belt skew and maintain alignment reliability. This dynamic control capability enables the system to adapt to different operational requirements, providing ease of operation through independent control when needed while ensuring reliability through coordinated control when necessary.
Solution Approach 2:
Each steering system incorporates local feedback through sensors that continuously monitor lateral position and feed this information to the control mechanism. This local feedback enables independent operation for simple corrections while the overall system can integrate feedback from multiple locations to coordinate control actions, thereby maintaining both ease of operation and alignment reliability through hierarchical feedback control.
Data Source
AI summary
Disclosed are embodiments that use multiple, belt-steering systems to control and maintain alignment of an endless belt. The position of the edge of the belt is measured by multiple belt edge sensors and then corrected by at least two steering rollers connected to corresponding steering mechanisms. The steering mechanisms tilt the rollers in order to selectively adjust the lateral position of the belt. Steering can be controlled independently with the tilt of each steering roller being adjusted based solely on information obtain from a corresponding belt edge sensor. Alternatively, steering can be controlled dependently with the tilt of each steering roller being adjusted based on information obtain from multiple sensors at multiple locations and further based on the predictable impact of the simultaneous movement of both rollers on belt positioning. In addition, at least one of the steering rollers can also be configured as a drive roller.