Tension Adjusting Unit Balancing for Stable Printing
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Solution Overview
Problem
The stability of tension rollers in recording apparatuses is compromised when retracting a rolled medium, leading to unstable posture and tension variations, which affects the printing process.
Innovation Solution
A liquid ejecting apparatus with a tension adjusting unit that is rotatable and balanced by a weight, allowing it to apply tension at a balancing position, and includes a fixing unit to secure the tension adjusting unit when not in use, ensuring stable posture and consistent tension application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tension roller is retracted to replace the rolled medium, then the medium can be replaced, but the posture of the tension roller becomes unstable
Solution Approach 1:
The patent applies a counterweight mechanism to the tension roller assembly, where a weight is positioned to balance the tension roller at specific positions (contact position and retracted position). This counterweight arrangement ensures that the tension roller maintains a stable posture both when applying tension to the medium and when retracted for medium replacement, eliminating the instability problem during medium replacement operations.
2Productivity
If the tension roller is used to apply tension to the medium, then the medium can be transported, but the tension varies when the roller posture is unstable
Solution Approach 1:
The counterweight mechanism balances the tension roller at the contact position where it applies tension to the medium. This ensures the tension roller maintains a stable and consistent posture during medium transport, preventing tension variations and ensuring reliable, consistent tension application throughout the printing process.
Solution Approach 2:
Instead of using complex active control systems to maintain tension roller posture, the patent inverts the approach by using passive gravitational balance through counterweights. This mechanical inversion simplifies the system while achieving stable posture maintenance, where gravity itself becomes the stabilizing force rather than requiring active control.
3Force
If a weight is attached to the tension roller to adjust tension, then the tension can be adjusted, but the tension roller posture becomes unstable during retraction
Solution Approach 1:
The patent positions the weight (counterweight) strategically to create a balancing effect at multiple positions. The counterweight is arranged so that its gravitational force balances the tension roller both when the roller is in the contact position (applying tension) and when retracted, thereby maintaining posture stability while preserving tension adjustment capability.
Solution Approach 2:
The counterweight mechanism serves multiple functions simultaneously: it enables tension adjustment by positioning the weight at different distances from the rotation axis, while also providing posture stability at both contact and retracted positions. This multi-functional design eliminates the need for separate mechanisms for tension control and posture stabilization.
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 stabilizes the posture of the tension adjusting unit, reducing tension variations and improving operability by ensuring the tension adjusting unit returns to a balanced position and is securely fixed when not in use, enhancing the reliability of the printing process.
Implementation Method 1
the tension adjusting unit is capable of applying the tension to the medium at a balancing position at which the tension adjusting unit is balanced by a weight of the tension adjusting unit
Implementation Method 2
the fixing unit may include a magnet which fixes the tension adjusting unit
Data Source
AI summary
A liquid ejecting apparatus includes an ejecting unit that is capable of ejecting a liquid; and a tension adjusting unit that is rotatable about a rotational shaft and that is capable of applying a tension to a medium by coming into contact with the medium onto which the liquid is ejected. The tension adjusting unit is capable of applying the tension to the medium at a balancing position at which the tension adjusting unit is balanced by a weight of the tension adjusting unit.