Maintenance of constant web clearance at contactless turning gui

Details Maintenance of constant web clearance at contactless turning gui Maintenance of constant web clearance at contactless turning gui

1980-05-09

1981-08-11

McCarthy, Edward J.

Advancing material of indeterminate length

By fluid current

And web storage

226196, 242 76, B65H 1732

Patent

active

042829984

ABSTRACT:
In a contactless turning guide controlling a running web through a change of direction, pressure air from a source thereof is delivered into a plenum chamber, from which it issues through slots that direct it between the web and a curved guide surface, to form a pressurized air cushion on which the web floats out of contact with said surface. A damper that controls flow of pressure air into the plenum chamber is automatically so positioned by a servo as to maintain a constant distance between said surface and the web, notwithstanding variations in web tension. For control of the servo, a supply pressure sensor produces a first output corresponding to above-atmospheric pressure of air in the plenum chamber, a cushion pressure sensor having an inlet at said surface produces a second output corresponding to above-atmospheric pressure in the air cushion, and a ratio-forming device to which said outputs are fed produces a ratio signal corresponding to a ratio relationship between the first and second outputs. In a comparison device, the ratio signal is compared with a manually adjustable set-point signal to produce a control output which is so applied to the servo as to maintain said ratio relationship substantially constant.

REFERENCES:
patent: 3405855 (1968-10-01), Daly
patent: 3521802 (1970-07-01), Bossons
patent: 4182472 (1980-01-01), Peekna
patent: 4197973 (1980-04-01), Doane
patent: 4197992 (1980-04-01), Doane

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