Printer Paper Guide Printhead Gap Control
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Solution Overview
Problem
Inkjet printers face challenges in maintaining print quality during full bleed printing, as over-sprayed ink can smear onto subsequent media sheets due to minimal control over the media feed and nozzle gap, leading to inconsistencies in the printing gap and increased smearing.
Innovation Solution
The printer design incorporates a paper guide on the printhead support structure adjacent to the printhead ICs to define the nozzle gap and uses a print platen with a recessed section containing absorbent material to minimize contact between the media and platen, reducing smearing from over-sprayed ink during full bleed printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the media is allowed to contact the print platen during full bleed printing, then the media can be directed into position, but ink smearing occurs on subsequent sheets
Solution Approach 1:
The harmful contact between the media and print platen is extracted/removed by using a paper guide that directs media into position without requiring platen contact. The media is taken out of the problematic interaction with the platen surface while still achieving proper positioning through the guide mechanism.
Solution Approach 2:
A paper guide acts as an intermediary element between the media feed path and the print platen. It directs the media sheets into the correct position and maintains the gap without requiring the media to contact the platen, thus preventing ink smearing while ensuring proper media alignment.
2Manufacturing precision
If the gap between printhead and media is reduced for better print quality, then print resolution improves, but control over media feed becomes more difficult
Solution Approach 1:
The paper guide serves as a precision intermediary that maintains a consistent gap between the printhead and media. It provides a fixed reference surface that ensures reproducible spacing without requiring complex active control mechanisms, thereby achieving manufacturing precision while avoiding increased device complexity.
Solution Approach 2:
The paper guide structure is designed to automatically maintain the correct gap through its geometry and positioning. The media feed system self-regulates by following the guide's defined path, eliminating the need for complex sensors, actuators, or control algorithms to maintain gap consistency.
3Productivity
If full bleed printing is performed without media contact control, then printing coverage is maximized, but over-sprayed ink deposits on the platen
Solution Approach 1:
The harmful deposition of over-sprayed ink on the platen is extracted by eliminating the contact surface. The paper guide directs media into position while maintaining spacing that prevents ink from reaching the platen, thus removing the harmful deposition pathway while preserving full bleed printing capability.
Solution Approach 2:
The paper guide converts the potential harm of uncontrolled media positioning into a benefit by using the guide's structure to define a precise feed path. This ensures consistent gap maintenance and prevents ink smearing, turning a potential problem area into a solution that enables clean full bleed printing.
Data Source
AI summary
An inkjet printer having an inkjet printhead having at least one printhead IC for ejecting ink, and a support structure for mounting the ink jet printhead in the printer and supporting the at least one printhead IC. The support structure has a paper guide adjacent the at least one printhead IC. The printer also has a print platen for facing the at least one printhead IC during printing to define a gap between the print platen and the at least one printhead IC, the print platen having a guide surface for directing the sheets of print media into the gap. A media feed path extends through the printer along which sheets of media substrate are fed, the media feed path being partially defined by the paper guide on the support structure and the guide surface of the print platen. During use, the sheets of print media path in sliding contact with the paper guide and spaced from the guide surface during printing.