Patent GB-434195-A (GB)
Title: Delivery mechanisms for rotary steel plate printing machines
IPC: B65H39/14
Filed: 1934-01-25
Abstract: 434,195. Printing-machines. BARKER, R. W., 56, Ludgate Hill, London.-(American Bank Note Co. ; 70, Broad Street, New York, U.S.A.) Jan. 25, 1934, No. 2602. [Classes 100 (i) and 100 (ii)] Set-off, preventing; feeding and winding webs.-The sheets delivered from a rotary intaglio printing-machine are wound within a set-off web the winding-mechanism of which is driven continuously by a power train which includes a speed - reducing mechanism continuously adjusted during the winding operation so that the linear speed of the web is kept constant. This speed may be initially adjusted so that the sheets are closely spaced in the roll irrespective of the size and number of plates on the printing-cylinder. A highspeed winding-mechanism is provided to wind rapidly any unused portion of the web at the end of the printing operation and an automatically controlled brake is provided on the web supply reel. The set-off web 13, Figs. 1 and 6, passes from the supply reel round guide rollers 15.. 19 to the winding reel 12, the sheets being delivered by the tapes 10 on to the inclined portion of the web between the roller 19 and reel 12. The reel winding- mechanism comprises a gear 20 on the reel shaft, one or more intermediate gears 22, 23, and a driving gear 21 on a shaft 28. This shaft, upon the closure of a clutch 90, receives motion from the sprocket wheel 27 of the power train which includes a speed-reducing mechanism of known form comprising pulleys 36, 37 connected by a belt 64 and adjustable in diameter by levers 56, 57 actuated by a right- and left-hand 'screwed rod 58. The shaft 38 of the pulleys 37 is driven through a clutch 96, Fig. 1, from a suitable source of power by chain and spur gearing 39..47, and the shaft of the pulleys 36 drives the sprocket wheel 27 by bevel gear 34, 33, worm gear 32, 31, a selected one of three sprocket wheels 24, 25, 26, and a chain 29. The screwed rod 58 of the speed-reducing gear is adapted to be driven by a sprocket wheel 51 fast with the wheel 27, acting through chain and sprocket gearing 52, 53, 55, 62, 61 and a speed-reducing mechanism of any suitable form which will permit manual adjustment of the rod 58, when desired, by a hand-wheel 65. This manual adjustment of the rod 58 and the choice of sprocket gear 24, 25, 26 enable the speed of the web to be adjusted initially so that the sheets are properly spaced in the roll, and this speed is thereafter maintained substantially constant while the winding reel increases in diameter, by the automatic adjustment of the rod 58 and consequent continuous reduction of speed of the winding mechanism 20..23. The clutch 96 is connected by linkage 97, 99, 93 94 to the throwoff mechanism of the press so that with the actuation of this mechanism the winding of the web is also interrupted. The winding mechanism may also be rendered inoperative by opening the clutch 90. The high-speed winding mechanism comprises a gear 110, Fig. 6, on the shaft 28 meshing with a gear 109 on a shaft 101 geared to a shaft 104, Fig. 1, adapted to be driven, upon closing a clutch thereon, by chain gear 106 from the shaft of the gear 46. The brake for the supply reel comprises a drum 66 and a band 67 carrying a weight 68 and attached at one end to one arm 69 of a two-armed lever pivoted about the reel shaft. The other arm 71 of this lever is connected by a link 72 to an arm 73 on a rock-shaft 74. A second arm 79 on this shaft and a similar arm at the other end of the reel carry a roller 81 kept in contact with the reel surface by the weight 68. By these means, as the reel diameter decreases, the lap of the band 67 on the drum 66 is gradually reduced. To facilitate the insertion of new reels, the roller 81 may be held in a depressed position by a latch 86 engaging a pin 84 on a hand lever 82 connected by a link 83 to the arm 79.