roll gap a controllable positioning device is provided which includes a motor operated by a controller during predetermined time intervals or as a function of actual vibrations sensed at the pair of rolls forming the roll gap to automatically vary the tilt angle application_number US 20209488 A description the wet press generally designated in fig1 as 100 comprises a pair of rolls 10 forming a roll or press gap 1 between upper roll 2 and the lower roll 3 one or more of the rolls 2 3 are flexure controlled i e comprise a stationary crosspiece extending through a hollow rotatable roll to form a clearance space therewith the clearance space is supplied with a liquid for hydraulically supporting the hollow roll the protruding ends of the crosspiece are supported in a paper making machine frame by swinging levers or other guiding devices which are not shown in fig1 both the paper web 4 to be drained and the belt shaped felt 5 which is at least as wide as the paper web 4 are simultaneously conducted through the gap 1 the felt 5 runs in the manner shown in fig1 in a closed loop path generally defined by guiding and deflection rolls 6 7 8 and 9 rolls 6 and 7 are arranged at about the same elevation relative to the upper roll 2 such that the felt 5 is looped around the upper roll.