Patent ID: 7625465

Claim:
Vacuum belt conveying device for guiding a moving web, in particular a web threading strip of a paper or board web, having an air-permeable transport belt guided endlessly in a loop with an upper run and a lower run, and a device arranged within the loop for applying a vacuum to the inner side of one of the runs of the transport belt in order to hold the web firmly on the transport belt, wherein the device for applying a vacuum is formed by means of at least one long-gap ejector, which in each case has an air jet injector having a large number of air outlet nozzles along the inlet side of the long gap and, on the inlet side, is positioned at a distance under the inner side of the run which is provided to hold the web firmly; and wherein within the loop there is arranged a dividing wall, which divides a suction chamber, in which the inlet side of the at least one long-gap ejector is arranged, from an outward flow chamber, in which an outlet side of the at least one long-gap ejector is arranged.