Conveyance Guide Surface Micro-Features for Drying Uniformity
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Solution Overview
Problem
Conveyance drums with irregularities on their surface cause uneven heat transfer, leading to drying unevenness on recording media in ink jet recording devices.
Innovation Solution
A conveyance device with a guide surface featuring hole portions and projection portions, where the diameter of these features is 0.31 mm or less, and are arranged at specific angles to minimize drying unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conveyance drum with irregularities (protrusions and holes) is used to convey the recording medium, then the recording medium can be stably conveyed, but drying unevenness occurs due to different heat transfer ease between protrusions and other portions
Solution Approach 1:
The invention changes the critical parameter of irregularity size by specifying that the diameter of hole portions and projection portions must be 0.31 mm or less. This parameter change ensures that the irregularities are small enough to not cause noticeable drying unevenness while still providing sufficient friction for stable conveyance. The precise numerical specification resolves the contradiction by finding the optimal size threshold.
Solution Approach 2:
The invention applies local quality by creating irregularities (hole portions and projection portions) only on specific regions of the guide surface that contact the recording medium. These localized irregularities provide the necessary friction for stable conveyance without affecting the overall uniformity of the drying process across the entire recording medium surface.
2Manufacturing precision
If the diameter of hole portions and projection portions is reduced to suppress drying unevenness, then drying uniformity improves, but conveyance stability may be compromised
Solution Approach 1:
The invention establishes a critical parameter threshold (0.31 mm or less) that simultaneously satisfies both drying uniformity and conveyance stability requirements. By setting this specific upper limit on the diameter of irregularities, the invention finds the optimal balance point where irregularities are small enough to prevent visible drying unevenness but large enough to provide sufficient friction for reliable conveyance.
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 suppresses drying unevenness on recording media by ensuring uniform heat transfer and stable conveyance, improving the visibility and conveyability of the recording medium.
Implementation Method 1
since the conveyance drum disclosed in JP6608963B has different ease of heat transfer between the protrusion on the outer peripheral surface of the conveyance drum and a portion other than the protrusion, there is a problem that drying unevenness occurs
Data Source
AI summary
Provided are a conveyance device and a printing device that suppress drying unevenness of a recording medium to be conveyed in a state where liquid is applied thereonto. The drying unevenness is suppressed by a conveyance device including: a holding member that holds a recording medium having a first surface onto which liquid is applied; a guide member having a guide surface that comes into contact with a second surface that is a surface opposite to the first surface of the recording medium; and a drive mechanism that drives the holding member and the guide member in a conveyance direction, in which the guide surface has either or both of hole portions and projection portions, and a diameter of the hole portion and the projection portion, or a diameter of an inscribed circle inscribed in the hole portion and the projection portion is 0.31 mm or less.