B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
341/40
B41F 33/00 (2006.01) B65H 23/24 (2006.01) B65H 23/32 (2006.01) F26B 13/20 (2006.01)
Patent
CA 1144261
MAINTENANCE OF CONSTANT WEB CLEARANCE AT CONTACTLESS TURNING GUIDE ABSTRACT OF THE DISCLOSURE 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, notwith- standing 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 relationship substantially constant.
373632
Megtec Systems Inc.
Smart & Biggar
LandOfFree
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