In a device located on a spinning preparation machine, in particular to a flat card, roller card, etc., at least one card clothing and/or non-card-clothing substantially-stationary machine element is positioned on the opposite of the clothing of a roller, such as a cylinder, and is isolated from the card clothing of the roller; the support surface on the end portion of the machine element is engaged with the corresponding support surface of stationary bearings; and an adjusting component is arranged in a region between each end portion and the bearings for changing radial spacing between the card clothing of the roller and the machine element. To enable the carding nip to be adapted or kept constant in a simple manner in structure and assembly aspects under the condition of thermally induced size change of the machine element and/or the roller, particularly during the operation process, each of adjusting elements of the machine element and adjusting elements of the bearings has inclined surface, the inclined surfaces on both sides mutually form an angle in the same direction, and the machine element, in the event of undergoing thermally induced expansion in its longitudinal direction, is movable along the inclined surface which leads to remaining the same radial spacing by means of the adjusting.