Printhead Assembly Datuming with Dual Datum Points
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Solution Overview
Problem
Existing datuming systems in inkjet printers often fail to optimize positioning for both assembly and printing processes, leading to inefficiencies and increased complexity in manufacturing and operation, particularly for wider printhead assemblies where precise alignment is required.
Innovation Solution
A dual datuming system is introduced, utilizing two distinct sets of datum points for assembly and printing, with seven shared points, where one set establishes a horizontal plane for assembly and a vertical plane for printing, allowing for a compact print zone and efficient paper path while maximizing precision and minimizing the number of parts required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single set of datum points is used for both assembly and printing, then the device complexity is reduced, but the manufacturing precision and positioning accuracy for both processes cannot be optimized simultaneously
Solution Approach 1:
The patent divides the datuming system into two separate sets of datum points: a first set for assembly positioning and a second set for printing positioning. This segmentation allows each set to be independently optimized for its specific function, resolving the contradiction between device complexity and manufacturing precision by creating specialized subsystems rather than using a single general-purpose system.
Solution Approach 2:
The patent creates a dual datuming system where the printhead assembly can be positioned using different datum point sets depending on the operation phase. The system universally supports both assembly and printing operations with dedicated datum points for each, allowing multi-functionality while maintaining optimization for each specific function.
2Manufacturing precision
If separate datum points are used for assembly and printing, then the manufacturing precision for each process is optimized, but the device complexity increases
Solution Approach 1:
The patent segments the positioning system into distinct assembly datum points and printing datum points, allowing each to be optimized independently. This segmentation enables high precision for both processes while managing complexity through clear functional separation and dedicated positioning references for each operational phase.
3Productivity
If a compact print zone and efficient paper path are implemented, then the productivity is improved, but the alignment precision of printhead assemblies may be compromised
Solution Approach 1:
The dual datuming system provides universal positioning capability that works regardless of the physical layout constraints. By having dedicated printing datum points separate from assembly datum points, the system can achieve precise alignment even in compact configurations with efficient paper paths, as the printing datum points are specifically optimized for the printing operation rather than being constrained by assembly requirements.
Data Source
AI summary
In one example, a datuming system to position a printhead assembly relative to a component external to the printhead assembly includes a first datum on the printhead assembly to establish a first plane, a first line, and a first point and a second datum on the printhead assembly to establish a second plane orthogonal to the first plane, a second line, and a second point.