Patent GB-467859-A (GB)
Title: Improvements in or relating to machines for feeding paper sheets or the like
IPC: B65H3/08
Filed: 1936-02-14
Abstract: 467,859. Feeding sheets. POLLAK, J. E. (Brehmer, Geb.) Feb. 14, 1936, No. 4592. [Class 100 (i)] In a sheet-feeding device the sheets are separated by means, which will operate without the aid of timing mechanism, comprising telescopic suction devices each having a stationary suction chamber 40 in which can slide a suction separator 43. Each separator is provided with an air relief orifice 44a which is closed when the separator rests upon the sheet pile, and thereupon is lifted by suction from the pile permitting air to be blown under the separated sheet from an adjustably mounted blower 49 with a flat nozzle 54. The invention is described in connection with means whereby a fanned out pile is formed on a table 13 from sheets placed on an upper table 12 and advanced by tapes 19, 22, 24 over a pulley 16, and with sheetforwarding means comprising a driven perforated suction band 29 passing over pulleys 30 and a sucker bar 32, and forwarding rollers 33. The telescopic members are adjustably mounted on adjustable side gauge members 34 which are set apart a distance equal to the width of the sheets. On each gauge 34 a bracket 35 is adjustably secured in such a position that the separator 43 acts on the rear edge of the sheet, and by means of a screw 38 the height of the suction chamber 40 is fixed. When the separator 43 rests on the sheet air pressure is reduced in the chamber 40, and the separator rises to an adjustable extent which is determined by contact with an adjustable screw collar 44b of a flange on the separator. The separated sheet is finally pulled across the orifice 44a by the band 29, and then the separator returns automatically to effect a further separation. Sheets below the separated sheet are prevented from rising by an adjustably mounted brush 57 carried by a collar 55 on the air blast tube 49. If it is desired to hold the separator out of action a clamping screw 46 can be made to engage a groove 45 in the separator when in its raised position. The separator may be fitted with a plate 66, Fig. 9, for preventing the air blasts from acting on the separated sheet until this has been raised a certain height from the pile. The plate is connected to an arm 67 which loosely embraces the separator 43, and is fitted with a guide arm 68. Preferably the connection between the separator and the arm 67 is a lost-motion one so that there is a lag in the rising of the plate, which is set to engage the sheet behind the uppermost one. As shown in Fig. 5, the separator is connected by a pleated bellows 61 to the suction chamber 40, clamping collars 63, 63a securing the bellows in position. A guide member with three vanes 65a guides the movements of the separator pad 64. In a further modification, Fig. 9, the separator 44, and other associated elements 66, 57, 54 are mounted upon a pivoted bar 71 controlled by the height of the pile. The bar 71 is angularly adjustable relatively to an arm 74 pivoted to a shaft 75 and carrying a roller 76 resting on the pile. A number of separators 43 may be arranged across the sheet pile, and the suction chambers of the separators are preferably connected together in such a manner that the separators are released simultaneously after having raised a sheet. A plurality of air blast devices may act in conjunction with each separator, or one air blast nozzle may serve a plurality of separators. The devices may act on an erect pile as well as on a fannedout pile. The contact face of the suction member may be inclined to the plane of the sheet pile.