Rotating Drum Printing Apparatus Multi-Sheet Transport
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Solution Overview
Problem
Existing printing apparatuses with rotating drums face reduced throughput when performing continuous printing operations on multiple sheets, as the drum must rotate and transport each sheet to the printing head multiple times, limiting efficiency and requiring extended drum lengths to prevent medium detachment.
Innovation Solution
A printing apparatus design where multiple sheets are arranged on the rotating drum's outer surface, allowing subsequent sheets to be transported to the printing head while the first sheet is being printed, with extended surface space utilization and nozzle configurations to enhance ink dot density and resolution, and incorporating a drying portion to prevent nozzle clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the rotating drum rotates a recording medium once or more and transports it to the printing head multiple times to achieve high resolution, then the ink dots become dense and resolution improves, but the throughput of continuous printing operation on multiple sheets decreases
Solution Approach 1:
The system segments the printing process by dividing it into multiple printing passes, where the drum rotates multiple times and the printing head ejects ink in sequential passes. Each pass deposits ink at slightly different positions, and the cumulative effect of multiple passes creates dense ink dot patterns for high resolution while maintaining continuous operation capability
Solution Approach 2:
The system prepares subsequent recording sheets in advance on the rotating drum before the current sheet completes its printing passes. While the first sheet is being printed multiple times, the drum continues to transport and position subsequent sheets, so that when the current sheet finishes, the next sheet is already ready at the printing position, eliminating idle time and improving throughput
2Area of stationary object
If the circumferential length of the outer peripheral surface is extended to hold multiple recording mediums, then the space for holding sheets is increased, but the drum size increases
Solution Approach 1:
Instead of extending the drum's circumferential length in a single dimension, the system utilizes the rotational dimension (time) to accommodate multiple recording sheets. The drum rotates to bring different sheets into the printing position sequentially, effectively using the time dimension enabled by rotation to hold and process multiple sheets without requiring excessive circumferential space
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
This design improves the throughput of continuous printing operations by allowing multiple sheets to be processed efficiently without interrupting the printing process, while maintaining high resolution and preventing nozzle clogging, and reduces the drum's size by optimizing the arrangement of sheets and ink receiving portions.
Implementation Method 1
a printing head that is disposed opposite to the outer peripheral surface of the rotating drum and ejects ink onto the recording medium held on the rotating drum
Implementation Method 2
a drying portion for drying ink attached to the recording medium is provided at a position opposite to the printing head with the rotating drum therebetween
Data Source
AI summary
A printing apparatus includes a rotating drum that holds a recording medium on a cylindrical outer peripheral surface thereof and rotates around a rotating shaft, and a printing head that is disposed opposite to the outer peripheral surface of the rotating drum and ejects ink onto the recording medium held on the rotating drum to perform a printing operation. The rotating drum holds a first recording medium and a second recording medium arranged in a rotating direction. A distance between a rotating direction downstream end of the first recording medium and a rotating direction upstream end of the second recording medium is larger than a distance between a rotating direction downstream end of the second recording medium and a rotating direction upstream end of the first recording medium.