Differential Roller Spacing in Printing Apparatus for Meandering Accuracy
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Solution Overview
Problem
Existing printing apparatuses face issues with print medium meandering due to increased transport path length and the need for more transport rollers, leading to size and cost increases.
Innovation Solution
A printing apparatus design with narrower intervals and precise parallelism between first transport rollers to maintain meandering accuracy, reducing the number of rollers and apparatus size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transport path length is increased to improve printing speed, then the printing speed is improved, but the print medium easily meanders
Solution Approach 1:
The patent applies different roller interval specifications to different sections of the transport path. The first transport rollers (upstream) have narrower intervals to prevent meandering, while the second transport rollers (downstream) have wider intervals. This local differentiation allows the transport path to be lengthened for higher printing speed while maintaining meandering accuracy where it matters most.
2Manufacturing precision
If the number of transport rollers is increased to suppress meandering, then the meandering is suppressed, but the size and cost of the apparatus increases
Solution Approach 1:
Instead of uniformly increasing the number of transport rollers throughout the entire path, the patent concentrates the rollers with narrower intervals only in the first transport section where meandering prevention is most critical. The second transport section uses fewer rollers with wider intervals, thus suppressing meandering effectively while minimizing the overall number of rollers and apparatus complexity.
3Manufacturing precision
If the intervals between transport rollers are narrowed to prevent meandering, then the meandering accuracy is improved, but the number of rollers increases
Solution Approach 1:
The patent narrows the intervals between rollers only in the first transport section where meandering prevention is most critical. The second transport section maintains wider intervals between rollers. This localized approach to roller spacing achieves effective meandering control while minimizing the total number of rollers required in the system.
Data Source
AI summary
A printing apparatus includes: a printing unit that performs printing on a print medium; a support unit disposed facing the printing unit, the support unit supporting the print medium; a plurality of first transport rollers that transport the print medium to the support unit; a medium collection unit that winds in a roll shape the print medium on which printing was performed by the printing unit; and a plurality of second transport rollers that transport the print medium from the support unit to the medium collection unit. Each interval between the plurality of first transport rollers is narrower than an average value of each interval between the plurality of second transport rollers.