Liquid Ejecting Device Velocity-Adaptive UV Curing
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Solution Overview
Problem
The existing liquid ejecting devices face challenges in maintaining consistent printing quality due to variations in velocity during the movement of the liquid ejecting head and the emission light source, leading to differences in the time elapsed between liquid ejection and active energy beam emission.
Innovation Solution
A liquid ejecting device with a control unit that adjusts the emission of the active energy beam based on the relative velocity of the liquid ejecting head and the emission unit, ensuring a constant emission range in the sub-scanning direction by varying the emission output during different velocity periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the liquid ejecting head and emission light source move together at variable velocities, then the device can accelerate and decelerate to reach a stop, but the time elapsed from liquid ejection to active energy beam emission varies, causing differences in printing quality
Solution Approach 1:
The emission timing is dynamically adjusted based on the relative velocity between the liquid ejecting head and emission light source. During acceleration and deceleration phases, the emission timing is shifted to compensate for velocity changes, ensuring consistent printing quality across all velocity ranges
Solution Approach 2:
The emission timing parameter is changed according to the velocity state. When the relative velocity changes during acceleration or deceleration, the emission timing is advanced or delayed accordingly, transforming the timing parameter to maintain constant printing quality
2Manufacturing precision
If the emission timing is adjusted to compensate for velocity changes, then printing quality consistency is improved, but the control complexity increases
Solution Approach 1:
The control system uses feedback from the relative velocity measurement to automatically adjust the emission timing. The velocity information feeds back to the emission control unit, which then modifies the emission timing accordingly, creating a closed-loop control system that maintains printing quality without manual intervention
3Manufacturing precision
If the emission range in sub-scanning direction is kept constant, then the active energy beam effectively processes the liquid, but the emission output must be varied during different velocity periods
Solution Approach 1:
The emission output is locally adjusted based on the velocity period. During acceleration and deceleration phases, the emission output is modified specifically in those time periods while maintaining constant emission range in the sub-scanning direction, applying different emission characteristics to different temporal regions
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
This solution effectively reduces the differences in printing quality across various velocity ranges by ensuring consistent emission of the active energy beam relative to the liquid ejecting head, thereby improving overall printing performance.
Implementation Method 1
inkjet recording devices eject, onto a medium, photocurable ink such as ultraviolet (UV) curable ink that is cured when irradiated with ultraviolet light
Data Source
AI summary
A liquid ejecting device such that, when an emission unit passes above an ejected liquid in a first non-constant velocity period concerning a velocity of movement of a liquid ejecting head and the emission unit, emission is performed at not less than an effective output when a distance between the liquid ejecting head and the emission unit is a first distance. In a second non-constant velocity period that is a non-constant velocity period and in which the relative velocity relative to the medium is faster than that in the first non-constant velocity period, in a case in which the emission unit passes above the ejected liquid, the liquid ejecting device performs control such that emission is performed at not less than an effective output when the distance is a second distance longer than the first distance, and at less than an effective output when the distance is the first distance.