Roll-to-Roll Recording Path With Adjustable Wrap Angle Control
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Solution Overview
Problem
In existing printing devices, changes in the outer diameter of the medium wound in a roll shape cause variations in the wrap angle, leading to inconsistent tension application, which can result in winding defects such as misalignment and wrinkling.
Innovation Solution
The recording device incorporates a conveyance unit, a recording unit, a take-up unit, a tension applying unit, an intermediate guide member, a first heating unit, and a downstream guide roller to maintain consistent tension and reduce wrap angle variations, using a control unit to adjust the position of the downstream guide roller and heating units to suppress wrinkling and misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the outer diameter of the medium wound in a roll shape changes, then the wrap angle of the medium wound on the take-up guide member changes, but this causes tension variations and winding defects such as misalignment
Solution Approach 1:
The downstream guide roller is made movable in the conveyance path, allowing its position to be dynamically adjusted based on the outer diameter of the wound medium. This dynamic positioning maintains a constant wrap angle on the take-up guide member despite changes in medium diameter, preventing tension variations and winding misalignment
Solution Approach 2:
The control unit receives information about the outer diameter of the wound medium and automatically adjusts the position of the downstream guide roller to maintain the optimal wrap angle. This closed-loop feedback system ensures consistent winding quality adapt to different medium sizes
2Manufacturing precision
If the wrap angle of the medium wound on the take-up guide member changes, then the tension applied to the medium varies, but this causes winding defects such as misalignment and wrinkling
Solution Approach 1:
The downstream guide roller position is dynamically adjusted to maintain a constant wrap angle, which in turn maintains consistent tension on the medium throughout the winding process, preventing both misalignment and wrinkling defects
Solution Approach 2:
The position parameter of the downstream guide roller is changed in response to outer diameter variations, which compensates for the effects of diameter changes and maintains both wrap angle and tension consistency
3Manufacturing precision
If heating units are added to maintain consistent tension and suppress wrinkling, then winding quality improves, but device complexity increases
Solution Approach 1:
The heating function is segmented into multiple heating units positioned at different locations (upstream and downstream of the take-up guide member), allowing localized temperature control to prevent wrinkling and misalignment without requiring a single complex heating system
Solution Approach 2:
The heating units act as intermediary elements that indirectly affect tension and wrap angle by controlling the thermal state of the medium, providing a subtle influence that prevents defects without requiring direct mechanical intervention
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 reduces tension variations and suppresses winding defects like misalignment and wrinkling by maintaining consistent wrap angles and applying appropriate tension, enhancing the quality of the wound medium.
Implementation Method 1
a first heating unit configured to heat the intermediate guide member
Data Source
AI summary
A recording device includes a conveyance unit that conveys a medium, a recording unit that performs recording on the medium, a take-up roller that winds up the medium, a tension roller between the conveyance unit and the take-up roller in a conveyance path of the medium, and that applies tension to the medium, an intermediate guide member between the take-up roller and the tension roller and on which the medium is wound in a direction such that a surface opposite to the recording surface is in contact with an outer surface thereof, a first heating unit that heats the intermediate guide member, and a downstream guide roller that is rotatably disposed between the take-up roller and the intermediate guide member in the conveyance path and on which the medium is wound in a direction such that the recording surface is in contact with an outer surface thereof.