Delivery mechanism for rotary presses

In einem Ausgang für eine Bogenrotationsdruckmaschine ist eine Saugwalze mit durchgehenden Sauglöchern vorgesehen. Die Sauglöcher sind auf einer links- bzw. rechtssteigenden Spirallinie angeordnet. Die Saugluftzufuhr erfolgt von außen über eine Mehrzahl an den Radius der Saugwalze angepaßter Saugluftzufuhrstücke. 1. A delivery mechanism for sheet-fed rotary printing presses with a driven suction roller (1) which is provided with a plurality of suction holes, characterized in that the suction roller (1) is provided with a multitude of boreholes (2) separated from one another, that a plurality of suction air feed pieces (3) adapted in longitudinal direction of the suction roller and alongside each other to the radius (r) of the suction roller (1) are arranged to be sealed off against each other and are connected to a suction air source which is capable of being turned on and off, that the boreholes (2) are arranged, commencing in each case from half a suction roller length, on a spiral line rising to the left and right respectively and extending over half the roller length.