Apparatus for testing the base-folding of bases formed on tube s

Details Apparatus for testing the base-folding of bases formed on tube s Apparatus for testing the base-folding of bases formed on tube s

1983-07-15

1987-02-24

Nelms, David C.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

250223R, 250237R, 493 12, B65H 4308

Patent

active

046453393

ABSTRACT:
In a bag-making macine where a base is formed on an end of a tube section by folding and successively folded tube sections are conveyed transversely at intervals with the main part of each tube section flattened and its folded base perpendicular thereto, photocells are provided to scan the leading and trailing folded edges of each base. The photocells and a light source are disposed on opposite sides of each base and an arcuate disc rotatable about its center of curvature at a circumferential speed equal to the conveying speed of the tube sections bridges the intervals between the bases of successive tube sections so that the photocells remain unexposed unless the bases are deformed.

REFERENCES:
patent: 3365699 (1968-01-01), Foster
patent: 3374714 (1968-03-01), Berghgracht
patent: 3524389 (1970-08-01), Stork
patent: 3997270 (1976-12-01), Suzuki

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