Patent ID: 7416522

Claim:
A folding drum of a folder of a printing press for forming second longitudinal folds on copies which have been severed from a web-shaped printing material and are pre-folded with a first longitudinal fold and preferably with at least one crossfold, said folding drum comprising: folding-drum side walls on opposing ends of said folding drum; a journal connected to each of said folding-drum side walls, said journals being rotatably arrangeable in a frame of the folder for rotatably supporting said folding drum; a folding-blade spindle having two opposing ends and arranged in said folding drum between said folding-drum side walls; at least one folding blade arranged on said folding-blade spindle; a pair of roller bearings respectively arranged proximate said two opposing ends of said folding-blade spindle, wherein said two opposing ends of said folding-blade spindle are rotatably mounted in said roller bearings; and at least one device positioned laterally next to at least one roller bearing of said pair of roller bearings, said spindle being mounted in said at least one device, and said at least one device introducing a radial force into said folding-blade spindle and radially prestressing said at least one of said roller bearing, wherein said at least one device comprises a ball bearing acting on the folding-blade spindle which decouples the introduction of radial force from a rotational movement of said folding-blade spindle and a spring element acting on said ball bearing and providing the radial force.