Carriage Angle Adjustment Mechanism for Liquid Droplet Jetting
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Solution Overview
Problem
Existing liquid droplet jetting apparatuses face challenges in finely adjusting the angle of the carriage and securing a sufficient adjustable range, particularly when nozzle rows are inclined, leading to degraded print quality due to deviations in ink droplet landing positions.
Innovation Solution
A liquid droplet jetting apparatus with an angle change mechanism featuring inner and outer eccentric cams and a rotation stop member, allowing for precise adjustment of the carriage's angle by moving the movable slide member in the second direction, while maintaining a sufficient movable range even with reduced eccentricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the eccentricity of the eccentric round shaft is reduced to enable fine adjustment of the carriage angle, then the manufacturing precision of nozzle row alignment is improved, but the adjustable range of the carriage angle is reduced
Solution Approach 1:
The adjustment mechanism is segmented into two independent eccentric round shafts (first and second) with different eccentricities. The first shaft provides coarse adjustment with large eccentricity for wide angle range, while the second shaft provides fine adjustment with small eccentricity for high precision. This segmentation allows both large adjustable range and fine precision to coexist.
Solution Approach 2:
Different parts of the adjustment system are assigned different local qualities - the first eccentric round shaft has large eccentricity optimized for broad angle coverage, while the second eccentric round shaft has small eccentricity optimized for fine precision adjustment. Each component is locally optimized for its specific adjustment function.
2Manufacturing precision
If more grooves are formed in the dial plate to enable fine adjustment of nozzle row direction, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The mechanical groove-based positioning system is replaced with an eccentric cam-based continuous adjustment system. Instead of discrete grooves limiting adjustment positions, the eccentric round shafts provide continuous angular adjustment through their rotational eccentric motion, eliminating the need for complex groove patterns in the dial plate.
3Manufacturing precision
If the dial plate is enlarged to accommodate more grooves for fine adjustment, then the manufacturing precision is improved, but the device complexity and size increase
Solution Approach 1:
The complex dial plate with multiple grooves is replaced by a simpler system using two eccentric round shafts with different eccentricities. This substitution eliminates the need for an enlarged dial plate with complex groove patterns, achieving fine adjustment precision through the eccentric mechanical advantage rather than through geometric complexity.
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
Enables precise adjustment of the carriage's angle to ensure accurate alignment of nozzle rows, thereby improving print quality by preventing deviations in ink droplet landing positions, even with long nozzle rows and reduced eccentricity.
Implementation Method 1
The angle change mechanism has an inner eccentric cam and an outer eccentric cam rotatable around a rotation shaft extending in a direction perpendicular to the second direction
Data Source
AI summary
A liquid droplet jetting apparatus includes a jetting head having a jetting surface on which a plurality of nozzles are formed for jetting liquid droplets; a carriage carrying the jetting head and moving reciprocatingly in a first direction along a surface parallel to the jetting surface; and a guide member having a guide surface perpendicular to the jetting surface and extending in the first direction to guide the carriage along the guide surface. The carriage is provided with a fixed slide member fixed to the carriage to slide along the guide surface; a movable slide member arranged apart from the fixed slide member in the first direction to slide along the guide surface and configured to be movable with respect to the carriage in a second direction perpendicular to the first direction; and an angle change mechanism for changing an angle of the carriage relative to the first direction.