Printer Duplex Transfer Speed Control for Long Sheets
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Solution Overview
Problem
Existing printers struggle to control transfer speeds in the sheet circulating transfer route independently from the printing mechanism, particularly when handling sheets longer than standard size, leading to printing errors.
Innovation Solution
A printer system with a drive controller that adjusts transfer speeds at the sheet transfer portion and the sheet circulating transfer route based on sheet length, ensuring the second transfer speed matches or exceeds the first transfer speed for sheets equal to or longer than a prescribed path distance to maintain printing quality and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transfer speed in the sheet circulating transfer route is controlled independently from the printing mechanism, then productivity is improved, but printing precision deteriorates for long sheets
Solution Approach 1:
The patent implements dynamic speed control where the transfer speed of the sheet circulating transfer route is adjusted based on sheet length. For long sheets (length ≥ path distance), the transfer speed is set equal to the printing mechanism speed to maintain printing precision. For short sheets (length < path distance), the transfer speed is increased to improve productivity. This dynamic adjustment resolves the contradiction between productivity and printing precision.
2Productivity
If the second transfer speed is set greater than the first transfer speed for short sheets, then productivity is improved, but printing quality deteriorates
Solution Approach 1:
The patent applies different transfer speed control strategies to different sheet length categories. For long sheets, the transfer speed is locally optimized to match the printing mechanism speed to ensure printing quality. For short sheets, the transfer speed is locally optimized to be higher to improve productivity. This localized quality control resolves the contradiction between productivity and printing quality.
3Manufacturing precision
If the transfer speed is synchronized with the printing mechanism for long sheets, then printing quality is maintained, but productivity is reduced
Solution Approach 1:
The patent changes the transfer speed parameter based on sheet length. For long sheets, the transfer speed parameter is set equal to the printing mechanism speed to maintain printing quality. For short sheets, the transfer speed parameter is increased beyond the printing mechanism speed to improve productivity. This parameter change strategy resolves the contradiction between printing quality and productivity.
Data Source
AI summary
For a sheet circulating transfer route that includes a sheet transfer portion of a printing mechanism provided with a transfer belt for transfer of a sheet as positioned thereto, a transfer section provided with drive rollers for transfer of a sheet as image-formed by an image former of the printing mechanism, and a sheet invert portion operable for inversion of the sheet as image-formed, there is a drive controller adapted, in conformity to a condition that a sheet to be positioned in the printing mechanism is equal in length to or longer than a path distance from the image former to the drive rollers, to set a transfer speed of the sheet as image-formed by the drive rollers up as an identical speed to a transfer speed of the sheet as positioned by the transfer belt, and in non-conformity to the condition, to set it up as a greater speed than the transfer speed by the transfer belt.