Patent GB-190224728-A (GB)
Title: Improvements in and relating to Multicolour and Letterpress Printing Machines
Inventor: RUDOMETOFF MICHAEL
Filed: 1902-11-11
Granted: 1903-11-11
Abstract: 24,728. Rudometoff, M. Nov. 11. Rotary machines; feeding - apparatus for webs; delivery apparatus.-Relates to a machine in which a multicolour impression on one side of the paper, and letterpress im. pressions on both sides, are made at each revolution of the cylinders. The upper cylinder A is provided with three colour-printing blocks 3, 4, 5, and with a colourcollecting and transfer - printing member 6, a letterpress forme 7, and an impression surface 8. The lower cylinder B is provided with two impression surfaces 9, 10, co-acting with the members 6, 7 respectively, and a letterpress forme 11, co-acting with the surface 8. The colour blocks 3, 4, 5 are each inked with the proper colour by the respective inking-apparatus 12, 13, 14 and the colours are transferred from the three blocks 3, 4, 5 to the member 6 by transfer rollers 59, 60, 61. The rollers 59, 60, 61 are formed with grooves running in different directions and of different depths, and the collecting-member 6 is correspondingly grooved. The forme 7 is inked by the apparatus 15. The rollers 59, 60, 61 and the inking-rollers are lifted from the parts of the cylinder A they are not required to touch. The forme 11 is inked by the apparatus 16. The roll of paper 17 is in bearings 18, and the feed is regulated by a rubber roller 20 resting on the web, and a metal roller 19 resting on the roller 20. The roller 19 is connected with a rod 21 having rollers 27 embracing an arm 28, provided with a pawl operating a ratchet 29 geared by a chain 31 to the web roll shaft. The rod 21 is oscillated by a rod 22 connected to a lever 23 which is operated by a rod 24 connected to a crank on a pinion 25 driven by the wheel 26 so as to make three revolutions to one of the cylinders. As the diameter of the web roll decreases, the roller 19 and rod 21 descend and increase the stroke of the arm 28. The paper passes over rollers 32, 33 and a tension roller 34 rests in a loop in the web. The web then passes between rubber rollers 35, 36 which nip it firmly, the upper one being geared to a rack 37 on the reciprocating frame 38, which slides on rollers 39. At each end of the frame 38 is a bar 40, which grips or clamps the paper on the frame, so that a length is held while the frame 38 makes three to- and-fro movements, printing the paper successively against the colour member. 6, the forme 7, and the forme 11. In its forward movements, the frame 38 is gripped and moved by the cylinders A. B, which engage rubber-covered bars on the frame, and the cylinders are recessed at the parts between the printing-members to permit of the return of the frame after each impression. The return of the frame 38 is effected by an arm 47 pivoted at 46 and operated by a roller on the wheel 25. The arm 47 is recessed at 76 to permit the roller on the wheel 25 to proceed in case the frame 38 becomes locked at the end of its movement to the right. The bars 40 are operated to release the paper after three impressions, made at each revolution of the cylinders, by levers operated by a rod 44 having a projection 43 engaged by a cam 42 on the cylinder B While the paper is released, a clamping-levice 52 draws H forwards under a cutter 53. The clamp 52 is carried by a lever 51 operated by a spring 51*, a rod 50, and a projection 50* on the cylinder B. The cutter 53 is operated by levers 54, 55 and pin 57 on the wheel 26.