Abstract: The invention provides a radial friction bearing assembly, particularly for rotatably mounting the rolls of a paper or textile material processing machine, which will give a stable rotational movement without any vibrations and ensures that always an uninterrupted lubrication film is available, even at very low rotational speeds. A preferred embodiment of the bearing assembly comprises a stationary shaft member and an annular sleeve member rotatably mounted on the shaft member. The latter one comprises on its outer surface a plurality of equidistantially arranged longitudinal grooves which extend parallelly to the axis of the shaft member. A plurality of trapezoidally shaped recesses or pockets, having a substantially smaller depth than the longitudinal grooves, extend from and communicate with said grooves, the base edge of the trapezoid adjoining the leading edge of the longitudinal grooves.

Abstract: The invention relates to a roller with rotatable sleeves in which each sleeve has, seen from above, a trapezoidal shape; they are mounted and idle on a central shaft in such a way that the large side of a sleeve is aligned with the small side of the adjacent sleeve; in which the sleeves are fastened to each other in this position for their rotation on the central shaft.

Abstract: A web-spreading shaft has a central rod with fixed modules aligned thereon. The modules are trapezoidal-shaped, in lateral view, and are aligned in fixed angular relationship along the rod. The latter is stressed axially and thus takes an arcuate shape, according to the angular relationship of the modules. Rotating cylindrical sleeves are aligned on the thus curved shaft. Means are provided for circulating a lubricating fluid between the rotating sleeves and the shaft.