only at one of the two ends of the roll press it is understood however that the same arrangement is present at the other end as a whole therefore the result is thus obtained that the principal axes 1a and 3a of the two rolls 1 and 3 always lie precisely in the pressing plane e this is true even if with the roll press not under load created by tension bars 7 and 8 there is only a relatively loose connection between the bearing bracket 5 and 6 the 34 centering 34 of the bearing brackets 5 6 in accordance with the invention can also be employed in the event of an oblique arrangement of the roll press as described in the priority patent application de p 41 40 879 9 differing from the drawing one can under certain conditions also dispense with having the guide piece 9 being removable and instead form the guide piece 9 to be a single structural part with the bearing bracket 5 in other words the guide piece 9 can form the projection developed on the bearing bracket 5 in accordance with another alternative not shown in the drawing the guide piece is divided by a horizontal separating line into an upper section and a lower section in this embodiment only the lower section performs the guide function and therefore engages into both recesses 25 and 26 the height of the upper section can be adjusted by a spreading device however the embodiment shown.