Liquid Jet Device Dot Alignment for Clear Edges
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Solution Overview
Problem
Existing liquid jet painting methods using a liquid jet head result in undesirable 'noise dots' at the edges of the painting area due to satellite dots falling outside the intended pattern, causing unclear edges.
Innovation Solution
The liquid jet device adjusts the center alignment of subsequent dots to overlap and hide satellite dots by shifting the center of each dot by a calculated distance, ensuring that satellite dots fall within the main dot pattern without requiring a specialized nozzle configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a liquid jet head discharges paint dots at regular intervals to cover a painting area, then the painting area is covered efficiently, but satellite dots protrude from the edges creating noise dots that degrade image quality
Solution Approach 1:
The patent utilizes the natural phenomenon of satellite dot formation and converts it from a harmful effect into a beneficial one. By calculating the precise landing position of satellite dots based on nozzle movement speed and dot discharge timing, the invention intentionally places satellite dots to fall within the painting area boundaries rather than outside them. This transforms the previously harmful protruding noise dots into acceptable or even useful elements that do not degrade image quality
Solution Approach 2:
The invention changes the control parameters of the liquid jet head system, specifically adjusting the relationship between nozzle movement speed and dot discharge timing. By modifying these parameters, the satellite dots are made to land at controlled positions within the painting area. The system calculates optimal discharge timing based on the nozzle speed and desired dot spacing, thereby controlling satellite dot trajectories to prevent edge protrusions
2Productivity
If the nozzle moves at high speed to increase productivity, then painting efficiency improves, but satellite dots are more likely to fall outside the painting area creating noise
Solution Approach 1:
The patent implements a feedback control mechanism where the actual nozzle movement speed is measured and used to adjust the dot discharge timing. Sensors detect the nozzle position and speed, and this information feeds back to the control system which calculates the optimal discharge moment. This closed-loop feedback ensures that even at high speeds, the satellite dots land at the intended positions within the painting area, preventing noise dot formation
Solution Approach 2:
The invention makes the dot discharge timing dynamic rather than fixed. The discharge timing is continuously adjusted based on the real-time nozzle movement speed. When the nozzle moves faster, the discharge timing is advanced proportionally; when slower, it is delayed. This dynamic adjustment ensures that the relationship between dot spacing and satellite dot trajectory remains optimal across varying speeds, maintaining edge clarity regardless of productivity level
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 method effectively eliminates noise dots, allowing for the creation of a painting area with clear edges using a standard nozzle head, improving image quality without altering the nozzle shape.
Implementation Method 1
a pressure is applied to the paint 20 from behind and the paint 20 is discharged as a paint dot 2a
Implementation Method 2
the tail of the paint dot 2a is pulled backward due to the viscosity and the surface tension of the paint 20 in the tip of the nozzle 2N
Implementation Method 3
the tail of the paint dot 2a is pulled backward due to the viscosity and the surface tension of the paint 20 in the tip of the nozzle 2N
Implementation Method 4
the fall velocity of the satellite dot 2c becomes slower than the fall velocity of the parent dot 2b
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A liquid jet device includes a head that discharges liquid to an object; a moving mechanism that moves at least one of the object and the head; and a controller that causes the head to discharge the liquid while moving the at least one of the object and the head in a first direction to form a first row of dots, and causes the head to discharge the liquid while moving the at least one of the object and the head in a second direction opposite the first direction to form a second row of dots that overlaps the first row of dots. The controller causes the center of the first dot in the second row of dots to be shifted from the center of the last dot in the first row of dots by a distance greater than or equal to a distance d.