Lateral Printhead Maintenance Unit for Compact Printer Cleaning
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Solution Overview
Problem
Existing printhead maintenance units in printers are bulky and require lateral movement of the printhead array for cleaning, which complicates the printer design and increases costs.
Innovation Solution
A printhead maintenance unit that moves laterally over the print medium support surface for cleaning, allowing the printhead array to remain stationary during printing, and incorporates a compact drive assembly with a gear rack and cam mechanism for efficient movement and fluid supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the printhead maintenance unit is provided next to the print medium support surface, then cleaning can be performed, but the unit becomes bulky and obstructs printing
Solution Approach 1:
The maintenance unit is enabled to move in the lateral direction (Y-axis), perpendicular to the transport direction, allowing it to access the printhead array from the side without occupying space above the print medium support surface. This dimensional movement resolves the conflict between cleaning accessibility and printing obstruction
Solution Approach 2:
The maintenance unit transitions from a static position that would obstruct printing to a dynamic system that can move laterally between a printing position (where it does not obstruct) and a cleaning position (where it engages the printhead array). The drive assembly with gear rack and cam mechanism enables this dynamic repositioning
2Reliability
If the printhead array is moved laterally for maintenance, then cleaning can be performed, but the system complexity and cost increase
Solution Approach 1:
Instead of moving the printhead array (which would require complex mechanisms affecting the printing system), the invention inverts the approach by moving the maintenance unit laterally. This simpler maintenance unit movement achieves the same cleaning objective without complicating the printhead array positioning system
Solution Approach 2:
The maintenance function is segmented into a separate, independently movable maintenance unit that can be positioned and operated separately from the printhead array. This segmentation allows the maintenance unit to have its own simple drive mechanism (gear rack and cam) without affecting the printing system's complexity
Data Source
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AI summary
A space efficient printhead maintenance unit for a printer (1) is provided. The printer comprises: - a printhead array (5) defining a printing range over a print medium support surface, in which printing range the printhead array (5) is arranged to at least partially form an image on the a print medium on the print medium support surface, wherein the print medium support surface extends in a transport direction (X), wherein the print medium is movable with respect to the printhead array (5) and a lateral direction (Y) perpendicular to the transport direction (X); - a printhead maintenance unit (20) provided with a drive assembly (30) for moving the printhead maintenance unit (20) with respect to the printhead array (5) for at least partially cleaning the printhead array (5), characterized in that - the printhead maintenance unit (20) in a first mode is movable in the lateral direction (Y) over the print medium support surface for at least partially cleaning the printhead array (5).