Flexure Printhead Alignment for Translation and Rotation Control
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Solution Overview
Problem
Existing printhead adjustment mechanisms struggle to achieve precise rotational and translational alignment, especially in large-scale industrial printers, due to manufacturing tolerances and space constraints, particularly in single-pass printers with printheads arranged around a cylindrical drum.
Innovation Solution
A printhead adjustment apparatus utilizing a parallel kinematic system with flexure arrangements and actuators to provide precise translation and rotation adjustments, allowing for compact design and improved alignment of printheads, without the need for additional locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If printhead adjustment is performed by removing and repositioning the printhead manually, then positioning accuracy can be improved, but production time increases and labor intensity increases
Solution Approach 1:
The patent applies preliminary action by pre-positioning adjustment marks and alignment features on the printhead and carrier bracket before assembly. The adjustment marks are pre-printed at specific locations, and the carrier bracket includes pre-formed positioning features that guide the printhead to its correct position, eliminating the need for manual measurement and adjustment during assembly.
Solution Approach 2:
The patent replaces manual mechanical adjustment with an automated marking and alignment system. Instead of requiring operators to physically remove, measure, and reposition the printhead, the system uses pre-printed adjustment marks and automated alignment processes to achieve precise positioning, thereby reducing labor intensity and production time while maintaining positioning accuracy.
2Measurement precision
If printhead adjustment is performed by removing and repositioning the printhead manually, then positioning accuracy can be improved, but operation complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-positioning adjustment marks and alignment features on the printhead and carrier bracket before assembly. The adjustment marks are pre-printed at specific locations, and the carrier bracket includes pre-formed positioning features that guide the printhead to its correct position, eliminating the need for manual measurement and adjustment during assembly.
3Adaptability or versatility
If inkjet marks are used for adjustment, then adjustment capability is provided, but the marks may smear or be removed causing adjustment information loss
Solution Approach 1:
The patent applies local quality by using different mark types in different locations. Adjustment marks positioned in high-wear areas are made with greater intensity or using more durable methods, while marks in protected areas can be less intensive. This localized differentiation ensures that critical adjustment information maintains its integrity in high-risk locations while still providing the necessary adjustment capability throughout the system.
Solution Approach 2:
The patent applies parameter changes by varying the intensity, color, or material properties of adjustment marks based on their location and importance. Marks that are more likely to be subjected to wear or contamination are applied with higher intensity or using materials that resist smearing and removal, thereby maintaining adjustment information stability while preserving adjustment capability.
4Adaptability or versatility
If adjustment marks are printed on the printhead, then adjustment information is provided, but the marks may be removed during printhead replacement causing adjustment information loss
Solution Approach 1:
The patent applies segmentation by dividing adjustment information into multiple locations and formats. Instead of relying on a single set of marks on the printhead, the system uses adjustment marks on both the printhead and the carrier bracket, as well as alternative adjustment methods. This segmentation ensures that if marks on one component are removed or damaged, adjustment information remains available on other components.
Solution Approach 2:
The patent applies universality by creating a multi-functional adjustment system that can operate with marks on the printhead, marks on the carrier bracket, or through alternative adjustment methods. This universal approach ensures that adjustment capability is maintained regardless of which component retains its marks, thereby preserving both adaptability and reliability of adjustment information.
Data Source
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AI summary
A printhead adjustment apparatus for adjusting the translation and rotation of a printhead is provided. The apparatus comprises a first portion and a second portion, each arranged for coupling to the printhead. The apparatus also comprises a first actuator coupled to the first portion by a first flexure arrangement and a second actuator coupled to the second portion by a second flexure arrangement. Translation of the first and second actuators in the same direction as each other causes translation of the first and second portions in the same direction as each other to provide translation of the printhead, while translation of the first and second actuators in opposite directions to each other causes translation of the first and second portions in opposite directions to each other to provide rotation of the printhead.