Method for inspecting glass containers

Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Sorting bottles – ampoules – jars – drinking vessels – or like...

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Details

209588, 250223B, 356240, 358106, B07C 5342

Patent

active

044873220

ABSTRACT:
A method for detecting a substantially transverse refractive defect in the sidewall of a transparent container is disclosed. The method comprises the steps of directing a filtered source of diffused light toward the sidewall of the container to provide an intensity gradient varying in a direction substantially parallel with the longitudinal axis of the container and sensing the intensity of light at a plurality of positions in a field-of-view aligned along a path in the plane of the sidewall and generally parallel with the longitudinal axis of the container. The method further comprises the step of producing a plurality of pixel signals each having a magnitude corresponding to the intensity of light sensed at each position in the field-of-view, whereby the shape of the wave train of pixel signals corresponds to the longitudinal intensity gradient in the absence of a transverse refractive defect and a detectable defect signature superimposed on the longitudinal gradient in the presence of a transverse refractive defect. The method finally includes the steps of analyzing the wave train of pixel signals to detect the presence of a defect signature and rejecting the container in response to a defect signal.

REFERENCES:
patent: 2326007 (1943-08-01), Capstaff
patent: 3886356 (1975-05-01), Gomm et al.
patent: 3926525 (1975-12-01), Sheldrick
patent: 3987301 (1976-10-01), O'Conner
patent: 4376951 (1983-03-01), Miyazawa
patent: 4378495 (1983-03-01), Miller

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