Dynamic Print Media Registration via Stack Height Sensing
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Solution Overview
Problem
In printing systems, misalignment of print media can lead to image skew, resulting in printed images being tilted or angled, necessitating accurate registration of the print media before printing.
Innovation Solution
A printing system comprising a media tray, pick assembly, registration assembly, and controller that senses the stack height and quantity of print media, using feed and pinch rollers to register and align the media along a media path, with the registration assembly operating for a predetermined time based on the media quantity to ensure proper alignment and advancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the registration assembly operates for a fixed time regardless of media quantity, then the alignment process is simple to control, but the alignment precision deteriorates when media stack height varies
Solution Approach 1:
The registration assembly's operation time is made dynamic rather than fixed. The controller adjusts the registration assembly's operation time based on real-time detection of media stack height, allowing the system to adapt to varying media quantities and maintain optimal alignment precision under different conditions.
Solution Approach 2:
The system incorporates a feedback mechanism where the controller detects media stack height and uses this information to adjust the registration assembly's operation time. This closed-loop control ensures that alignment precision is maintained across different media quantities by continuously monitoring and adjusting based on actual media conditions.
2Manufacturing precision
If the registration assembly operates longer to align media with varying stack heights, then alignment precision improves, but the printing productivity deteriorates due to extended registration time
Solution Approach 1:
The registration assembly's operation time is dynamically adjusted based on the detected media stack height. When media quantity is high, the registration assembly operates longer to ensure precise alignment. When media quantity is low, the registration time is reduced accordingly, preventing unnecessary delays and maintaining high printing productivity across varying media conditions.
3Manufacturing precision
If the system detects and adjusts registration time based on media quantity, then alignment precision improves, but the device complexity increases
Solution Approach 1:
The controller performs multiple functions: it detects media stack height, determines appropriate registration assembly operation time, and coordinates the registration process. By consolidating these functions in a single controller, the system achieves precise alignment adjustment without proportionally increasing overall system complexity.
Data Source
AI summary
A system for registering print media includes a media tray configured to hold a plurality of sheets of print media, a pick assembly configured to pick a sheet of the print media from the media tray and route the sheet to a media path, and a registration assembly positioned in the media path after the pick assembly. The registration assembly is configured to sense the sheet in the media path and operate for a predetermined time based on an amount of the print media in the media tray to register the sheet in the media path such that the predetermined time increases as the amount of the print media in the media tray decreases.