Inkjet Transport Barrel Inter-Shaft Distance Control
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Solution Overview
Problem
The multistage drum type sheet-of-paper transporting device causes distortion and creases in paper sheets due to the grasping units of upstream and downstream drums, leading to unstable transportation and potential deformation.
Innovation Solution
A recording medium transporting device with a printing barrel and two transporting barrels, where the inter-shaft distance between the barrels is set to the sum of their radii, and the barrels have gears for synchronized rotation, allowing the recording medium to be gripped and transported stably, with the inkjet head positioned to face the outer peripheral surface for high-definition printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the grasping unit of the printing drum is arranged on the inner side of the drum to reduce the protruding amount, then the distance between the inkjet head and the paper surface is reduced improving printing precision, but the paper sheet may be passed in a wavy state causing deformation and creases
Solution Approach 1:
The paper sheet transport path is divided into multiple independent drum stages (first transporting drum, second transporting drum, printing drum). Each drum has its grasping unit arranged on the outer peripheral surface, and the paper sheet is sequentially passed through each drum with controlled inter-shaft distances, preventing wave formation while maintaining printing precision
Solution Approach 2:
The inter-shaft distances between drums are specifically set (first inter-shaft distance equal to sum of radii of first and second transporting drums, second inter-shaft distance equal to sum of radius of printing drum and radius of first transporting drum). These parameter adjustments ensure proper alignment of grasping units across drums, preventing paper deformation while allowing the printing drum's grasping unit to be positioned for optimal printing distance
2Productivity
If the grasping units of upstream and downstream drums both grip the leading end portion of the paper sheet simultaneously, then the paper sheet can be transported continuously, but the paper sheet may be passed with the leading end portion being in a wavy state causing deformation
Solution Approach 1:
The problem is solved by adding the spatial dimension of inter-shaft distance control between multiple drums. By arranging drums at specific distances and positions in three-dimensional space, the grasping units of multiple drums can simultaneously grip the paper sheet without creating waves, maintaining both transport continuity and paper flatness
Data Source
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AI summary
In accordance with a recording medium transporting device (100) and an inkjet recording device (10) including the recording medium transporting device according to the present invention, an inter-shaft distance between a printing barrel (108, 52) that rotates and transports with gripping an end portion of a recording medium (P) inwardly from an outer peripheral surface thereof and a first transporting barrel (106, 110, 46) juncturally connected with the printing barrel is set to be a distance shorter than a sum of a radius of the printing barrel (108, 52) and a radius of the first transporting barrel, and an inter-shaft distance between the first transporting barrel and a second transporting barrel (104, 42) juncturally connected with the first transporting barrel is set to be a sum of the radius of the first transporting barrel and a radius of the second transporting barrel, which can suppress distortion of the recording medium (P) and enables the first transporting barrel (106, 110, 46) and the second transporting barrel (104, 42) to grip the end portion of the recording medium on the outer peripheral surface thereof, allowing stable transportation.