rotor 52 furthermore allows the fabric to be piled in each enclosure in an orderly fashion and the formation of tangles which may seriously hinder a free passage of the fabric through the portions 32a and 32b a description of this rotor is to be found in es p 2011141 application no 8803076 the invention contemplates the existence of a single rotor 52 for both portions 32a and 32b such that the rotor may oscillate between two positions which are respectively situated at a level below the portions 32a and 32b and substantially opposite the lower open ends of these portions there is a geared motor 54 for driving the rotor 52 and appropriate means allowing it to oscillate at least one and preferably both of the bottoms 14 and 20 of the enclosures 2 and 18 is a weighing platform i e is sensitive to the weight of the fabric deposited thereon furthermore each bottom 14 20 is associated with a weight control device 56 57 which in turn is associated with the said control means finally the apparatus may also comprise an automatic filter 58 for dust and lint removal and a fan 60 for exhausting the moist air and the products removed by the.