Centerline web guide apparatus

Winding – tensioning – or guiding – Coil holder or support – Spool or core

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Details

226 20, B65H 2526

Patent

active

043846866

ABSTRACT:
A centerline web guide apparatus for detecting the transverse position of the centerline of a longitudinally moving web of material unwinding from a supply roll and transversely shifting the supply roll to maintain the position of the web centerline along a desired path has two photoelectric detectors located at the opposite longitudinal edges of the web. The photoelectric detectors continuously move back and forth generally transversely of the web continuously monitoring the position of the longitudinal edges of the web. The supply roll of material is supported on a frame which is movable transversely of the web by, for example, an electric motor. As the moving photoelectric detectors detect the longitudinal edges of the web, they send an appropriate signal to the motor controlling the movement of the support frame to transversely move the support frame in an appropriate direction transversely of the web to maintain the centerline of the web in a constant position along the desired path.

REFERENCES:
patent: 1945981 (1934-02-01), Quinby
patent: 2666639 (1954-01-01), Frommer
patent: 2871013 (1959-01-01), Markey
patent: 3096919 (1963-07-01), Snyder
patent: 3254300 (1966-05-01), Prell
patent: 3323699 (1967-06-01), Bricker, Jr.
patent: 3325072 (1967-06-01), Black et al.
patent: 4054251 (1977-10-01), Henderson et al.
patent: 4106715 (1978-08-01), Pisani

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