surface each oscillating fin 17 is stressed by at least one spring 20 acting in the direction of keeping the fin normally turned in a horizontal position right next to the bottom face of the surface 14 in this position the fins 17 are coplanar and basically close the central opening 14 39 of the surface 14 they can anyhow be moved by turning and to a different extent far from the support surface in opposition to the relative springs 20 as will clearly appear hereunder in positions of partial and total opening the conveyor 18 extends above the support surface 14 parallel to it starting from the inlet 12 of the banknotes where there are two check rollers 23 till close to the outlet channel or chute 16 said conveyor 18 is the worm type composed of two drive belts 21 each one driven on pulleys 22 supported inside the sides of the body 10 the belts 21 are set on opposite sides of the central opening 14 39 of the support surface 14 and each one has a branch passing adjacent to this support surface the function of the conveyor 18 is to take every banknote to be collected to the level of the inlet 12 and to drag it to fully spread it out on the support surface 14 over the central opening of this surface the presser 19 is set and can be moved vertically at and through the central opening 14 39 of the support surface 14 said presser 19 having dimensions in length and width just a little under those of said central opening the vertical movements of the presser 19 can be obtained in.