Patent GB-190612695-A (GB)
Title: Improvements in or relating to Automatic Feeders for High Speed Printing Presses, Book-folding Machines and the like
Inventor: DVORAK PETER
Filed: 1906-05-31
Granted: 1907-02-07
Abstract: 12,695. Dvorßk, P. May 31. Feeding sheets.-The apparatus comprises friction devices 26<1>, Fig. 1, for advancing the top sheet of the pile against the register ledge 66, a weight 37 for holding the sheet about the centre, an adhesive device and fingers 46, 50 for raising the rear edge of the sheet, and an adhesive feeder for taking the sheet at the front edge and carrying it down to the printing-cylinder 99, the pile table 1 being reciprocated and also automatically raised. The friction devices 26<1> are on pairs of spring arms 26 on a spindle 24 mounted in arms 25 pivoted on guides 11 of the adhesive feeder. Half revolutions are imparted to the spindle 24, the first 120 degrees being effected by means of spring-controlled tappets 27 and a head 28 on a lever 30 actuated from a cam 31, and the remainder by means of projections 36 and springs 35. The weight 37 is mounted in recesses in the lever 30 so that it can be removed. The adhesive device for lifting the rear edge of the top sheet comprises a tank 38, Figs. 1 and 6, and several sticky rollers, the lowest roller 45 projecting from the tank. The fingers 46 swing loosely in the tank and are limited by set-screws 47. The fingers 50 are on a spindle 49 in,arms 48 and are held up by springs 51. The tank 45 is adjustable in a frame 39 on a slide 41 actuated from a cam 44. The arms 48 are adjustable on the framing. In order to pull the rear edge of the sheet from under the rear ruler 81, an inward rotation is given to the roller 45 by the provision of a free-wheel clutch and a rod 69 guided in a pivoted eye 70. The adhesive feeder comprises rollers 53, 54, 55, Fig. 9, arranged in a tank 52 mounted by means of pins 59, Figs. 1 and 3, in slide blocks 60, which are actuated in the guides 11 from a cam 20 through connexions 22, 23 The stickiness increases from the roller 53 upwards, for the purpose of automatic cleaning. The rollers 54, 55 are hung in adjustable brackets 56, 57. In order to ensure vertical position, the tank 52 is hung eccentrically in the blocks 60, the vertical position being determined by means of stops 61 on the blocks 60 and arms 62 on the pins 59. In order to deliver the sheet tangentially, the feeder is swung normally to the surface of the cylinder by means of arms 64 on the pins 59 and inclines 63 on the guides 11. The feeder first descends to take the shest and then ascends and swings inwards to withdraw the sheet from under the front ruler 71 and repel the next sheet. This swing is effected by means of spring catches 65 co-operating with the arms 62 ; the hook ends of the catches 65 are of considerable length, so that the feeder slowly returns to the vertical position. The sheet is delivered from the feeder to the cylinder 99 by rotation imparted to the roller 53 from the cylinder, and this rotation is maintained as long as the feeder remains in its bottom position, and effects cleaning of the feeder.. In order to ensure rotation, friction wheels are provided on the spindle of the roller 53 outside the tank 52. The rulers 71, 81 are given a movement in order to allow any bends or creases of the sheets on the pile to straighten. The ruler 71 is mounted in a guide 72 on the ledge 66, and is operated by a bell-crank lever 73 and connexion 75 from a cam 77, which is arranged to raise the ruler immediately before the advance of the top sheet. The ruler 81 is guided on rods 83 and is raised after the top sheet has been raised, by means of an elongated slide 85 and connexions with a cam 89. The table 1 is arranged on guide-rails 4, and is reciprocated by means of a cam 13, lever 15, and fork 17. Guiderollers 5 prevent lateral movement of the table on the rails 4. In order to be able to withdraw the table beyond the normal position, one limb 18 of the fork 17 is pivoted and retained by a catch 19, and the rear portion 100 of the table guide is pivoted and can be held up by a pin 101 ; the table is held in the withdrawn position by means of pins 103 and a grating 104. The table 1 is raised by means of lazy-tongs 6 actuated by screws 91, Fig. 15, connected by bevel-gearing, motion being imparted to one screw from the slide 41 by means of a pawl 93 and a toothed wheel 92, according to the thickness of the paper. The ledge 66 is arranged in guides on the table 1 and is retained by pins 67 travelling in grooves 68 on the framing, so that it does not rise with the table.