Spreader Nip Balancing via Closed-Loop Variable Force Control
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Solution Overview
Problem
Conventional methods for balancing the pressure profile in a spreader nip of print systems are open-loop and sensitive to geometry changes, requiring extensive simulation and testing whenever the nip geometry changes, leading to misalignment and uneven ink distribution.
Innovation Solution
A closed-loop system that uses variable forces applied to the inboard and outboard sides of the spreader nip, adjusted by a controller and sensor feedback, to maintain a balanced pressure profile regardless of geometry changes, ensuring the substrate tracks parallel to the target process direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional open-loop methods are used to balance the pressure profile in the spreader nip, then the system is simple to operate, but the system is sensitive to geometry changes and requires extensive simulation and testing whenever the nip geometry changes
Solution Approach 1:
The patent implements a closed-loop feedback control system that uses sensors to detect substrate position and edge registration in real-time. The controller continuously adjusts the loading on the spreader nip rollers based on this feedback, automatically compensating for geometry changes without requiring manual reconfiguration or extensive testing. This resolves the contradiction by maintaining ease of operation while dramatically improving adaptability to geometry changes.
2Device complexity
If the spreader nip forms a non-symmetric pressure profile, then the device complexity is reduced, but the substrate becomes misaligned and ink is unevenly spread
Solution Approach 1:
The patent employs dynamic adjustment of the spreader nip loading through independently controlled roller loading mechanisms. The system continuously varies the loading distribution across the spreader nip width based on real-time substrate position feedback, transforming a static, fixed-loading system into a dynamic one that actively maintains symmetric pressure profiles and precise substrate alignment without increasing inherent device complexity.
3Manufacturing precision
If extensive simulation and testing are performed to reevaluate load balancing equations whenever spreader nip geometry changes, then manufacturing precision is maintained, but productivity decreases
Solution Approach 1:
The patent implements a self-adjusting system where the closed-loop control automatically reconfigures the spreader nip loading in response to geometry changes detected by sensors. The system performs its own calibration and optimization without requiring external simulation or testing processes, thereby maintaining manufacturing precision while eliminating productivity losses associated with manual reevaluation and testing.
Data Source
AI summary
An approach is provided for balancing a pressure profile of a spreader nip formed by a first roller and a second roller within a print system. A line parallel to a target process direction is determined. One of an inboard side and an outboard side of the spreader nip is loaded with a first variable force. The other one of the inboard side and the outboard side of the spreader nip is loaded with a second variable force. The inboard side and the outboard side of the spreader nip are then separately loaded by a first balancing force and a second balancing force to cause a substrate passing through the spreader nip to track in a direction such that a side edge of the substrate remains parallel to the line parallel to the target process direction.