A device contains a support frame (1) equipped in a drive unit (2) and a drawbar (3) adopted for hitching to an agricultural tractor, on which a shaker (4), a shaft (5) with a rolled tarpaulin (6) are build and beside this shaft (5) a belt conveyor (7) is mounted longitudinally with a cleaner blower (8) and further a grate (9) for placing the cases. The work assemblies are equipped in the hydraulic motors supplied from a pump driven by a power take-off shaft of the agricultural tractor. The device contains the assembly (10) for placing the tarpaulin (6) consisting of a body (11) and a tarpaulin (6) guide (12). The body (11) is composed of two housings (13) and each one of them has the side walls (14) and structural elements (15) with which those housings (13) are fitted to the support frame (1). In the side walls (14) the pivots (16, 19) are mounted with the upper rollers (17), lower rollers (18) and side rollers (20) and on one of the side walls (14) a base (21) is mounted with the hydraulic motor (22) driving a toothed wheel (23) mounted in a shaft between the side walls (14). The guide (12) consists of two bars (24) created from the beams, whereby longitudinally, on the beam lower wall, a toothed rack (25) is attached. At the end of each of the bars (24) a fastener (26) is fitted with a pin (27) attached to it and on two pins (27) attached to the fasteners (26) the tarpaulin (6) edge is threaded. Each of bars (24) of the guide (12) is slid into the channel created by the cylindrical surfaces of the upper rollers (17), lower rollers (18) and side rollers (20) and the toothed rack (25) engages with the toothed wheel (23) which is mounted on the hydraulic motor (22) shaft or on the bearing equipped shaft (28) between the side walls (14) coupled with this motor (22) shaft.The bar (24) has in its symmetry plane shape of the arc of the external radius (R) in range of 2000 to 4500 mm and the same radius (R) contains a toothed rack (25) surface which contacts with the lo
