Web guidance and tracking mechanism for a continuous belt filter

Details Web guidance and tracking mechanism for a continuous belt filter Web guidance and tracking mechanism for a continuous belt filter

1990-01-03

1992-02-11

Stodola, Daniel P.

Advancing material of indeterminate length

With material-responsive control means

To position material laterally

B65H 2302

Patent

active

050869639

ABSTRACT:
The invention provides an improved web guidance mechanism in which the location of a web is detected and any deviation from a desired path is corrected without causing damage to the web material, for example a filter cloth. The improved mechanism includes two tracker units 10 having a pair of rollers 12, 14 defining a nip for an edge margin of a web. The lower roller 14 is acted on by an inflatable actuator 28 in the form of bellows and operative to raise or lower the roller 14 with respect to the upper roller 12. This is achieved by pivotally mounting a bracket 16, which carries the roller 14, and attaching thereto a bar 24 which rests via a contact plate 26 on the actuator 28. The actuator 28 is controlled by a sensor positioned adjacent to an edge of the web and operative to detect the presence or absence of the edge of the web on its desired path. In a preferred embodiment the sensor controls a pneumatic valve operable to inflate or deflate the actuator 28.

REFERENCES:
patent: 2947057 (1960-08-01), Meagher, Jr. et al.
patent: 3323700 (1967-06-01), Epstein et al.
patent: 3368726 (1968-02-01), Funk et al.
patent: 4007865 (1977-02-01), Crandall
patent: 4500045 (1985-02-01), Whitaker et al.
patent: 4567492 (1986-01-01), Skrafvenstedt et al.

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