A suction device is movable between a receiving position in which it removes a sheet of film from a magazine and a delivery position in which it transfers the sheet to a conveyor. The effective width of the suction device approximates or equals the width of the smallest sheet of film to be transferred. Sheets having a width greater than the smallest width are gripped in the region of one end thereof leaving the remainder of such a sheet free to deflect. In order to permit proper transfer of all sheets into the conveyor, the latter is provided with grooved rollers which lift the deflected portions of larger sheets into the conveyor. In the delivery position, the suction device is located opposite one portion of the conveyor. The conveying force exerted by this portion of the conveyor is smaller than the gripping force which the suction device exerts on a sheet but larger than the conveying force exerted by a laterally adjacent portion of the conveyor. The portion of a sheet in the latter part of the conveyor constitutes a moment arm when the sheet enters the conveyor and the vacuum in the suction device fails to shut off. The tendency is for the sheet to rotate about an axis which is located in the vicinity of the suction device and is normal to the sheet. This tendency is reduced by maintaining a relatively low conveying force in the portion of the conveyor remote from the suction device and maintaining a relatively high gripping force for the suction device.