Abstract: In a rotary applicator, suction rollers planetating about a central shaft are provided with suckers which are arranged in a row, project beyond the enveloping cylinders of the rollers and are placed on sucker carriers having suction air bores. The carriers communicate with suction air conduits and are rotatably but axially undisplaceably placed by means of sleeve-like tube members on the suction air conduits, the latter consisting of supporting tubes. The walls of the tubes and tube members are provided with bores which are in registry in the operative position of the suckers and of which the bores of the tube members communicate with the suction air bore of the sucker carrier. The suckers are rotatable to a position in which they are swung back within the enveloping cylinder and the walls of the tube members cover the bores of the supporting tube.

Abstract: An apparatus for supplying suction air to a rotary applicator comprises suction rollers planetating about a central shaft. Each suction roller carries suckers arranged in an axial row and the shafts of which are mounted in spaced discs secured on the central shaft. Two control valve discs connect the conduits leading to the suckers to a conduit leading to a suction air pump over a zone corresponding to an approximate angle of rotation of 90.degree. of the discs. The first control valve disc is formed directly by one of the discs mounting the suction roller shafts and the second control valve disc is secured in the frame and held in sealing sliding contact with the disc.