Apparatus for measuring the thickness of a roll winding on or un

Details Apparatus for measuring the thickness of a roll winding on or un Apparatus for measuring the thickness of a roll winding on or un

1985-05-20

1987-04-14

Levy, Stuart S.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

250571, B41J 2948, B65H 2608, G01V 904

Patent

active

046571981

ABSTRACT:
An apparatus for measuring the thickness of a roll winding on or unwinding from a core during winding or unwinding of a web, comprises a first detector having a beam projector and a beam receiver which are arranged along the core at opposite ends of the roll for detecting a predetermined thickness of the roll with a rough accuracy. A second detector having a beam projector and a linear array sensor is provided, for detecting the roll thickness with high accuracy. When the first detector detects a predetermined thickness of the roll, the second detector, which is supported on an arm carrying a positioning roller, is placed in operative position by pressing the positioning roller against the core and detects the thickness of the roll according to the position on the linear array sensor of the beam reflected from the surface of the roll.

REFERENCES:
patent: 2825513 (1958-03-01), Yerrid et al.
patent: 3161365 (1964-12-01), Johnson et al.
patent: 3279716 (1966-10-01), Huck
patent: 3971956 (1976-07-01), Jakeman et al.

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