are disposed in parallel and opposing relationship with a given spacing or difference in elevation h therebetween the magnitude of the height h is chosen to a suitable value which permits a stack of cloths to be received between the both frame sections the lenghts l 39 is chosen to be equal to at least one half the length of a table used such as a web laying or cutting table the lower frame section 1b is constructed in the form of a strip having a relatively reduced wall thickness so that it may be readily inserted between the stack of cloths and the table it has a front surface a and left and right end faces b and c all of which are formed as gently bevelled surfaces a plurality of rollers m are embedded in the bottom surface of the lower frame section 1b and are spaced apart along the length thereof with the rollers partly projecting below the bottom surface a main passage 2 extends lengthwise within the strip which defines the lower frame section 1b and branches into a plurality of air blow off openings 3 which are disposed in the bevelled surfaces adjacent to the free end the frame section 1b is centrally proveded.