GB1065136A - Sheet feeding mechanism - Google Patents

Abstract

1,065,136. Feeding sheets. HARRISINTERTYPE CORPORATION. July 14, 1965 [Nov. 23, 1964], No. 29936/65. Heading B6B. In apparatus for separating sheets from the top of a pile by suction means, and by air-blast means for directing a stream of air to float the sheets, a single control member can operate actuating means which control valves in the suction and compressed air lines whereby the pressures in these lines can be adjusted. The single control means is situated adjacent the platform of the operator. As shown, suckers 16 lift the top sheet of a pile P, suckers 17 forward the sheet between feed rollers 13, and the latter feed the sheet over a feed-board 14 to a printing press 11. The top sheets of the pile are ruffled by air-blasts from nozzles 18, and the top sheet is floated by air-blasts from nozzles 19 during its forward movement by the suckers 17. A single rotary valve 20, Fig. 2 (not shown), controls the connections from a suction line 22 to the suckers 16, 17, and those from a compressed-air line 21 to the nozzles 18, 19, and these lines are connected through pressure control valves 26, 24, respectively, to a pump 80. The valves 24, 26 are in a common body 27. The valve 24 for the compressed-air line 21 has inlet and outlet openings 31, 32, respectively, Fig. 6 (not shown), and a relief passage 36 to atmosphere is closed by a ball 37 engaged by a spring 40 in a plunger 41 which presses against a cam 45 secured to a shaft 70. Rotation of the cam 45 thus controls the pressure on the ball 37, and this controls the pressure of air in the line 21. The valve 26, Fig. 5 (not shown), in the suction line 22 has inlet and outlet openings 51, 52, respectively, to a chamber 53 which communicates with ports 56 to atmosphere when a plunger valve 58 is in a raised position. The valve 58 is urged upwardly by a spring 61 against a cam 61 secured on the same shaft 70 as the cam 45, so that rotation of the cam 61 entirely seals the suction chamber 53, or allows it a controlled outlet to atmosphere. Each valve 24, 26 communicates with a pressure gauge, and each has an adjustable relief valve set to determine initial working pressures in the lines 21, 22. The common shaft 70 extends to a control knob 75 in a position adjacent the platform 75 for the machine operator, and rotation of the shaft also trips switches 84, 85, Figs. 3 and 8 (not shown), which start and stop the motor driving the pump 80.