Asymmetric Liquid Discharging Head Units for Positional Shift Compensation
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Solution Overview
Problem
Liquid discharging apparatuses with multiple head units, particularly those with heads positioned differently in both directions, suffer from quality deterioration due to mounting errors, leading to positional shifting, which affects the alignment and quality of discharged ink patterns.
Innovation Solution
The apparatus is designed with two head units, each discharging different colors, where the heads within each unit are positioned differently in both directions to minimize the impact of positional shifting, ensuring accurate ink placement and image quality by separating the cyan and magenta ink discharge from different head units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple head units with heads positioned differently in both directions are used, then productivity and color discharge capability are improved, but mounting errors cause positional shifting that deteriorates image quality
Solution Approach 1:
The liquid discharging apparatus is divided into multiple independent head units (first head unit and second head unit), where each head unit contains heads for discharging different colors of liquid. This segmentation allows each head unit to be mounted independently on different sides of the circumferential direction, enabling the system to maintain high productivity while reducing the impact of mounting errors on overall image quality through the asymmetric configuration that minimizes positional shifting effects.
2Productivity
If heads are positioned at different positions in first and second directions, then color coverage and discharge efficiency are improved, but mounting errors cause significant quality deterioration
Solution Approach 1:
The head units are configured asymmetrically with respect to the circumferential direction, where the first head unit is mounted on a first side and the second head unit is mounted on a second side opposite to the first side. This asymmetric mounting configuration ensures that when positional shifting occurs due to mounting errors, the shifting patterns for different color heads differ, preventing uniform degradation and maintaining overall alignment accuracy and image quality.
3Area of stationary object
If head units are mounted on different sides of circumferential direction, then space utilization and installation efficiency are improved, but positional shifting affects ink placement accuracy
Solution Approach 1:
The patent utilizes the circumferential direction as an additional mounting dimension, arranging head units on opposite sides along the circumferential direction rather than only in linear directions. This dimensional arrangement optimizes space utilization and allows head units to be positioned at different locations while the asymmetric configuration ensures that positional shifting in this multi-dimensional arrangement does not uniformly affect ink placement accuracy, thereby maintaining printing quality.
Data Source
AI summary
a part of a first head is positioned in the second part, a part of a second head is positioned in the third part, a part of a third head is positioned in the fifth part, a part of a fourth head is positioned in the sixth part, and a first color is cyan and a third color is magenta.