Rolling Element Safety Assembly for Printhead Spacing
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Solution Overview
Problem
The challenge in printing systems is maintaining precise printhead-to-print medium spacing to ensure high print quality while preventing crashes between the printhead and the print medium, especially with thicker or irregularly shaped print media.
Innovation Solution
A safety assembly with a rolling element is positioned upstream of the printhead to detect and counteract upwards bending of the print medium, ensuring a consistent printhead-to-print medium spacing and preventing contact between the printhead and the print medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the printhead-to-print medium spacing is decreased to improve print quality, then print precision is improved, but the risk of crashes between printhead and print medium increases
Solution Approach 1:
The safety assembly is positioned upstream of the printhead to detect and correct print medium irregularities before they reach the printhead. This preliminary action prevents crashes while allowing the printhead to maintain optimal spacing for high print precision.
Solution Approach 2:
The safety assembly acts as an intermediary between the print medium and printhead. It detects upward bending of the print medium and applies corrective force to prevent contact with the printhead, enabling the system to maintain smaller printhead-to-medium spacing without increasing crash risk.
2Reliability
If a safety assembly is added to prevent crashes, then reliability is improved, but device complexity increases
Solution Approach 1:
The safety assembly uses a spring-loaded rolling element that automatically detects and corrects print medium irregularities through passive mechanical means. The spring provides automatic force adjustment without complex control systems, achieving reliable crash prevention with minimal added complexity.
Solution Approach 2:
The invention replaces complex active control systems with a simple passive mechanical safety assembly. The spring-loaded rolling element uses elastic potential energy storage and mechanical force to prevent crashes, eliminating the need for sensors, actuators, and control electronics that would increase device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The safety assembly effectively maintains a predetermined printhead-to-print medium spacing, enhancing print quality and reliability by preventing crashes and ensuring consistent printing performance across various print media thicknesses.
Implementation Method 1
The spring is configured to store and release energy to provide a corrective force to the print medium when it bends upwards
Data Source
Figure 1~2
Figure 3a~3b
Figure 4~5a
AI summary
Examples relate to printing systems comprising a safety assembly associated with a printhead. The safety assembly comprises a rolling element upstream of the printhead in the print medium advance direction to prevent a print medium from contacting the printhead.