Print Head Assembly Positioning via Lever and Lead Screw
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Solution Overview
Problem
Current methods for positioning print head assemblies in printer devices lack sufficient accuracy, which affects the quality of printed images due to inaccuracy in positioning droplets relative to each other.
Innovation Solution
A method utilizing a lever, coarse sensor, and lead screw mechanism with a fine sensor to determine precise positioning by detecting signals and adjusting distances between sensor detections, allowing for improved accuracy without requiring relative positioning of different sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a two-step positioning method (linear homing + rotary homing) is used, then the positioning process can be completed, but the positioning accuracy is insufficient
Solution Approach 1:
The positioning method is segmented into three distinct steps: coarse positioning using a lever and coarse sensor, intermediate positioning using a lead screw mechanism and fine sensor to detect first and second signals, and final positioning by calculating distances and selecting reference signals. This segmentation allows each step to address specific accuracy requirements without overwhelming system complexity.
Solution Approach 2:
The coarse positioning step using the lever and coarse sensor is performed preliminarily to bring the print head assembly close to the target position before the more precise lead screw mechanism is engaged. This preliminary action reduces the travel distance and improves the effectiveness of subsequent fine positioning steps.
2Measurement precision
If sensors are used to detect position, then positioning can be achieved, but sensor drift affects accuracy
Solution Approach 1:
The system uses feedback from the fine sensor to detect the positions of the first and second signals, calculates the actual distances traveled, compares them with predetermined distances, and selects the reference signal that minimizes the difference. This feedback mechanism compensates for sensor drift and maintains positioning accuracy.
Solution Approach 2:
The method dynamically changes the reference parameter (reference signal selection) based on the measured distances from the fine sensor. By selecting whichever reference signal (first or second) produces the smallest difference from the predetermined distance, the system adapts to sensor drift conditions and maintains optimal positioning accuracy.
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3E
AI summary
The present invention relates to a method for positioning a print head assembly in a printer device. The invention also relates to a printer device configured for applying such method.