Print Bar Height Adjustment for Elevation Detection
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Solution Overview
Problem
Inkjet printing devices face issues with print head damage due to elevations or disturbances on the recording medium, leading to printing pauses, increased spoilage, and high ink consumption during restarts.
Innovation Solution
A controller system that detects elevations in the recording medium and temporarily increases the printing gap by raising the print bars, allowing the elevation to pass without contacting the print heads, then resumes printing once the elevation has cleared, minimizing printing pauses and ink consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the print bar is arranged closely above the recording medium to achieve high print quality, then printing precision is improved, but the risk of contact between the nozzle plate and elevation on the recording medium increases
Solution Approach 1:
The print bar is made dynamically adjustable in its position relative to the recording medium. A sensor detects elevations on the recording medium, and the controller automatically adjusts the print bar's height to maintain an optimal printing gap. This dynamic adjustment allows the system to operate with closely spaced print bars for high quality while avoiding contact with elevations through real-time positional adaptation.
2Reliability
If printing operation is paused to avoid contact with elevation, then damage to print head is prevented, but productivity and printing efficiency decrease
Solution Approach 1:
A sensor is positioned upstream to detect elevations on the recording medium before they reach the print bar. The controller receives advance warning of upcoming elevations and proactively adjusts the print bar height to avoid contact. This preliminary detection and action allows the printing operation to continue without pauses, maintaining productivity while protecting the print head through preventive height adjustment.
3Object-affected harmful factors
If printing gap is increased to avoid contact with elevation, then contact harm is eliminated, but print quality deteriorates
Solution Approach 1:
The printing gap is dynamically adjusted based on real-time detection of elevation height and position. When an elevation is detected, the print bar height is increased to maintain adequate clearance. When no elevation is present, the print bar returns to its optimal low position for high-quality printing. This dynamic gap control eliminates the need for permanent gap increase, avoiding quality deterioration while preventing contact harm.
Data Source
AI summary
A controller may detect an elevation of a recording medium that is to be printed to, the elevation may result in the printing element of a printing device being negatively affected. The controller may automatically produce a time-limited printing pause of the printing element in which the printing gap between the printing element and the recording medium is temporarily enlarged in order to direct the detected elevation past the printing element. A negative effect on the printing device given the presence of a damaged recording medium may thus be efficiently and reliably avoided or reduced.