Printer Drum Suction Regions for Sheet Stability
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Solution Overview
Problem
Existing sheet suction devices in printers face challenges in maintaining the sheet in place during rotation, leading to lifting and potential contact with printing heads, which affects printing quality, especially for larger sheets.
Innovation Solution
A sheet suction device with a drum having multiple suction ports aligned in both circumferential and axial directions, divided into upstream, middle, and downstream regions, and a rotary valve system that adjusts suction regions based on sheet size, ensuring consistent suction across the sheet surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sheet suction device with uniform suction ports is used, then the structure is simple, but sheet lifting occurs during rotation especially for larger sheets
Solution Approach 1:
The drum surface is divided into multiple suction regions (first, second, third regions) with different suction port configurations. Each region has suction ports arranged at different intervals in the axial direction, allowing differentiated suction control for different parts of the sheet to prevent lifting
Solution Approach 2:
Different suction regions are designed with locally optimized suction port intervals. The first suction region has ports at wider intervals suitable for larger sheets, while the second and third regions have ports at narrower intervals for smaller sheets, ensuring optimal suction performance at each location
2Reliability
If suction ports are densely arranged to prevent sheet lifting, then sheet stability improves, but the device complexity increases
Solution Approach 1:
The suction system dynamically selects which suction region to activate based on sheet size detection. The rotary valve switches between different suction regions corresponding to different sheet sizes, providing adaptive suction control rather than a fixed dense arrangement
Solution Approach 2:
The suction port interval parameter is changed based on sheet size. For larger sheets, wider intervals are used; for smaller sheets, narrower intervals are used. This parameter adaptation prevents the need for a universally dense arrangement
3Adaptability or versatility
If the suction device is designed for large sheets, then large sheet handling improves, but small sheet suction precision decreases
Solution Approach 1:
The drum is designed with multiple suction regions that can handle different sheet sizes. By switching between regions, the same drum serves universal functions for both large and small sheets while maintaining precision for each size category
Solution Approach 2:
The system dynamically adapts its suction configuration to match the sheet size being processed. The rotary valve enables real-time switching between suction regions, allowing the device to optimize its performance for the current sheet size
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 solution effectively reduces sheet lifting and ensures stable conveyance, improving printing quality by maintaining the sheet in contact with the drum surface, even for larger sizes, thereby preventing ink misapplication.
Implementation Method 1
a suction device configured to suck the sheet through the multiple suction ports to attract the sheet on the circumferential surface
Data Source
AI summary
A sheet suction device includes a drum having multiple suction ports in a circumferential surface of the drum, the drum configured to bear a sheet on the circumferential surface and rotate in a circumferential direction of the drum, and a suction device configured to suck the sheet through the multiple suction ports to attract the sheet on the circumferential surface. The drum includes multiple suction regions aligned in the circumferential direction on the circumferential surface, each of the multiple suction regions includes the multiple suction ports aligned in the circumferential direction and in an axial direction of the drum on the circumferential surface, the multiple suction regions include an upstream region, a middle region, and a downstream region in the circumferential direction, and the middle region has the multiple suction ports at both outer sides in the axial direction of the drum.