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For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
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A method and apparatus is disclosed for maintaining a specified drop size from a robotic fluid dispenser which dispenses a drop by sending a timed pulse of air to a syringe.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
76% of the total text.
Page 1 of 1
Calibration Procedures for Robotic Fluid Dispensing
A method and apparatus is disclosed for maintaining a specified drop size
from a robotic fluid dispenser which dispenses a drop by sending a timed pulse
of air to a syringe.
An end of arm tool houses the syringe and retro-reflective optical sensor that
monitors a work surface from above. The sensor transmits a binary signal that
indicates the reflectivity of the surface (high or low).
In operation, the robot moves the end of arm tool over a calibration area
consisting of a mirror covered by a throw-away, clear, plastic film. The robot
program initiates an air pulse to the syringe, cycles through a loop N times and
then terminates the air pulse, releasing a drop of fluid onto the calibration
surface. The greater the number N, the larger the drop size will be. The robot
waits 10 seconds for the drop to spread out and then moves the sensor directly
over the center of the drop.
After centering, the sensor is moved slowly in the positive Y direction,
looking for the optical transition from the non- reflective drop to the reflective
surface. When the reflective surface is detected at the edge of the drop, the
coordinates representing the position of the robot arm are determined and
stored. The sensor then is returned to the center of the drop, and the negative Y,
positive X and negative X coordinates are detected as above. The robot
program then calculates the average diameter of the drop from these