and a bearing assembly 24 c 26 c therebetween the support element 14 is at its ends arranged with self aligning bearings 23 25 to allow a deflection of the support element 14 in the figure there is shown a drive 44 having a shaft 19 b on the shaft 19 b is mounted a disc 19 having a rubber ply at its peripheral end 19 a the outer ends of the flexible jacket 12 are fixedly attached between an annular ring 15 acting as a replaceable force transmitting device and the periphery of each end wall the ring 15 is fixedly attached to the end wall on the inside of the rotational part 24 b 26 b of each end wall there is fixedly attached a cog wheel 46 56 the drive arrangement 44 19 is movable in and out of contact with the force transmitting device 15 when it is desired to accelerate the enclosed shoe roll 10 the drive arrangement is moved such that the rubber ply 19 a comes into frictional engagement with the force transmitting device 15 the cog wheel 46 and the drive shaft 48 transmit the rotation of the end wall 24 to the other end wall 26 by the cog wheels 54 55 and 56 which at the same time function as a synchronizing device hence both end walls 24 26 are operated as described in reference to fig2 a fig2 b further illustrates in a schematic view one functional embodiment of the load shoe 18 generally the load shoe 18 is not disposed diametrically relative to the drive shaft but perpendicularly as in fig2.