Method for detecting obstructed nozzles

Details Method for detecting obstructed nozzles Method for detecting obstructed nozzles

1996-03-04

1997-03-25

Epps, Georgia Y.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

356372, 356394, 25022714, G01B 1102

Patent

active

056150121

ABSTRACT:
A method of detecting whether a vacuum nozzle on a high speed component placement machine is obstructed. A vacuum nozzle (10) has a hollow tube with a vacuum port (25) and an opening (12) at one end. The hollow tube having a fiber optic wire (20) located within it such that one end of the fiber optic wire is exposed to be illuminated (50) by a remote light source (30). The fiber optic wire transmits light to illuminate the opening from the interior of the vacuum nozzle. The amount of light exiting the illuminated opening is measured (55) by a remotely located light detector (35). A decision (60) is made as to whether the opening is obstructed by comparing the measured illuminated opening to a predetermined standard.

REFERENCES:
patent: 4459743 (1984-07-01), Watanabe et al.
patent: 4770529 (1988-09-01), Levinson et al.
patent: 4882497 (1989-11-01), Inoue et al.
patent: 5079433 (1992-01-01), Smith

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