Abstract: The invention relates to a machine for processing sheets, having a deliverer for delivering the sheets which comprises a delivery drum that is acted on pneumatically. The delivery drum has vacuum applied to it. The delivery drum also has disks for carrying the sheets, each of the disks defining vacuum channels for holding the sheets. The vacuum channels have openings and a vacuum connection. The openings and the vacuum connection together form a rotary valve cyclically applying vacuum to the vacuum channels.

Abstract: The invention concerns a spray nozzle for a powder duster for dusting freshly printed products with a connection for a tube for supplying a powder-air mixture, a distribution chamber and at least two nozzle channels which branch off from the distribution chamber like a fan, wherein the opening angle of the outer nozzle channels limiting the fan subtends an angular range of 5° to 20°, in particular an angular range of 8° to 15°, and preferably 12°. The invention also concerns a spray bar with spray nozzles of this type, a powder duster comprising spray nozzles of this type, and a method for dusting freshly printed products.

Abstract: The invention concerns a spray nozzle for a powder duster for dusting freshly printed products with a connection for a tube for supplying a powder-air mixture, a distribution chamber and at least two nozzle channels which branch off from the distribution chamber like a fan, wherein the opening angle of the outer nozzle channels limiting the fan subtends an angular range of 5° to 20°, in particular an angular range of 8° to 15°, and preferably 12°. The invention also concerns a spray bar with spray nozzles of this type, a powder duster comprising spray nozzles of this type, and a method for dusting freshly printed products.

Abstract: The invention relates to a machine for processing sheets, having a deliverer for delivering the sheets which comprises a delivery drum that is acted on pneumatically. The delivery drum has vacuum applied to it. The delivery drum also has disks for carrying the sheets, each of the disks defining vacuum channels for holding the sheets. The vacuum channels have openings and a vacuum connection. The openings and the vacuum connection together form a rotary valve cyclically applying vacuum to the vacuum channels.

Abstract: A sheet-processing rotary printing press includes a sheet guiding device over which sheets are to be pulled in a processing direction. The guiding device has a stationary first guide surface and a withdrawable second guide surface. The withdrawable second guide surface follows the stationary first guide surface in the processing direction, and forms a pocket with the first guide surface. The guiding device further includes a molded part received in the pocket and forming a third guide surface for bridging over the pocket.

Abstract: A sheet-processing rotary printing press includes a sheet guiding device over which sheets are to be pulled in a processing direction. The guiding device has a stationary first guide surface and a withdrawable second guide surface. The withdrawable second guide surface follows the stationary first guide surface in the processing direction, and forms a pocket with the first guide surface. The guiding device further includes a molded part received in the pocket and forming a third guide surface for bridging over the pocket.

Abstract: A device for decurling flat printing materials for a machine for processing the printing materials has a guide surface section whereover the printing materials are drawable. The guide surface section are formed with a decurling notch, and with suction openings arranged along and in the decurling notch and penetrating the guide surface section, and an evacuation system fluidically connected to the suction openings. The suction openings are formed in successive groups thereof, and the evacuation system including a plurality of chambers, of which respective chambers are assigned to a respective one of the groups of suction openings, the chambers being selectively settable with at least one of equal and unequal negative pressures therein during operation, and a machine for processing the printing materials having the decurling device therein.

Abstract: A device for decurling flat printing materials for a machine for processing the printing materials has a guide surface section whereover the printing materials are drawable. The guide surface section are formed with a decurling notch, and with suction openings arranged along and in the decurling notch and penetrating the guide surface section, and an evacuation system fluidically connected to the suction openings. The suction openings are formed in successive groups thereof, and the evacuation system including a plurality of chambers, of which respective chambers are assigned to a respective one of the groups of suction openings, the chambers being selectively settable with at least one of equal and unequal negative pressures therein during operation, and a machine for processing the printing materials having the decurling device therein.

Abstract: A delivery for a sheet processing printing machine having a delivery housing and a sheet conveyor substantially enclosed by the delivery housing, the delivery housing being formed with an opening at the underside thereof through which, operationally, sheets leave the delivery housing for forming a sheet pile, and a suction line connected to the interior of the delivery housing, the suction line having a negative pressure prevailing operationally therein, includes motor-driven fluid flow machines for acquiring air flows leaving the delivery housing through the opening and for generating air flows returning into the delivery housing.