Dynamic PPS Distance Correction for Print Media Deformations
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Solution Overview
Problem
Digital printing technologies face challenges in maintaining printing quality due to media deformations such as thickness variations, bending, and wrinkling, which can lead to image quality errors, printer malfunctions, and safety risks like media crashes and printhead damage, especially in unattended operations where predictive correction is difficult.
Innovation Solution
Implementing a method to dynamically measure and correct the pen-to-print media space (PPS) distance using a PPS detector, which identifies deformations and applies corrective functions like adjusting heat, speed, or delaying ink drop firing to maintain optimal printing conditions, thereby preventing errors and crashes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic measurement and correction of PPS distance is implemented, then printing quality and reliability are improved, but device complexity increases
Solution Approach 1:
The system performs preliminary measurement of the PPS distance using a detector before printing begins, and pre-adjusts the printhead position or identifies media deformation characteristics in advance. This allows the printing system to compensate for media variations proactively, ensuring reliable printing quality without requiring complex real-time adjustment mechanisms during the printing process.
Solution Approach 2:
The system incorporates a feedback mechanism where the PPS distance is measured dynamically, and the measured values are used to adjust printing parameters or correct media deformation. The controller receives measurement data and automatically adjusts the printing process, creating a closed-loop system that maintains reliability without manual intervention.
2Manufacturing precision
If corrective functions are applied to mitigate media deformation, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The system changes printing parameters such as printhead position, printing speed, or heat application based on measured PPS variations. By adjusting these parameters dynamically, the system compensates for media deformation and maintains printing precision without requiring mechanical correction devices.
Solution Approach 2:
Instead of using mechanical systems to physically correct media deformation (such as heating elements or mechanical pressure devices), the system substitutes these with computational methods. The controller calculates correction based on PPS measurements and adjusts digital printing parameters, replacing complex mechanical correction mechanisms with software-based solutions.
3Productivity
If PPS measurement and correction systems are implemented, then productivity is improved through reduced errors, but device complexity increases
Solution Approach 1:
The printing system performs self-diagnosis and self-correction by automatically measuring PPS distance and adjusting its operation based on the measurements. The system serves itself by detecting media variations and compensating without external intervention, reducing errors and improving productivity while keeping the added complexity minimal and integrated into the existing printing workflow.
Data Source
AI summary
Method and devices for dynamically preventing printing errors caused by a media deformation are disclosed. In one example, a pen to print media space (PPS) distance is measured. A media deformation is identified in response to measuring the PPS distance. A corrective function is identified in response to identifying the media deformation. The corrective function identified is then performed. The proposed method provides for consistent quality across a print.