Patent GB-191315328-A (GB)
Title: Improvements in or relating to Printing Machines.
IPC: B41L15/06
Filed: 1913-07-03
Granted: 1914-02-05
Abstract: 15,328. National Advertograph Co., Rice, H. A., and Patterson, C. G. July 3. Rotary machines ; printing-apparatus for paper holders; inking- apparatus; tripping- arrangements; printing- surfaces.-The printing and impression cylinders and other working parts of a web-printing machine, or of a paperholder with printing- apparatus attached, are mounted on a pivoted frame 7 which can be locked in the working position, as shown in Fig. 10, or in a position as shown in Fig. 6, where easy access can be obtained to the inking-devices 27, 28, &c., and to the printing- cylinder 18. Suitable tripping - arrangements for the cylinder 18, means for fastening the type on the cylinder, a n d web tensioning, guiding, and cutting devices are provided. The frame 7 is mounted on trunnions 6<a>, one of which has a slotted enlarged portion 8 engaging a sliding spring - pressed bolt, released by a handle 12 when it is desired to turn the frame 7 either into its working or its adjusting positions. The spindle 17 of the cylinder 18 runs in T-grooves 37 so as to be easily removable. In working position the weight of the cylinder 18 keeps it pressed against the web 38 on the impression cylinder 16, but in the tilted position of the frame 7 the spindle 17 of the cylinder 18 slides to the opposite end of the groove 37<a>. The type on the cylinder 18 is inked through rollers 27, 28, held in position by springs 29, 30, and mounted on shafts sliding in slots in a frame 19 pivoted on the shaft 17 and held by a catch 21 either in the working position, or in a position shown by dotted lines in Fig. 6, where the rollers are more easily got at. The type is formed on or mounted on flexible bands or carriers 31 having at each end a hooked portion 32 engaging with a hooked bar 33. A yielding backing 34, preferably of sponge rubber, is placed between the bands 31 and the cylinder 18. The spindle of the paper roll 39 is held in position in slots 41 by spring catches 42. A tension roll 58 bears against the roll 39, the spindle of the roll 58 being normally pushed forward in slots 59 by levers 61 and springs 62. The ends 60 of the slots 59 are turned as shown, so that by pushing the spindle of the roll 58 into them, it may be held out of working position. A second tension roll 45 is mounted in arms 46 pivoted at 46<a> and so acted on by springs 55 and levers, as to maintain a constant pressure on the roll 39 as its diameter decreases. This is done by varying the effective leverage of the spring 55 by the pivoted levers 51, 52. When the arms 46 are lifted right up, the springs 55 act on the other side of the fulcrum 46<a>, and hold the arms 46 in an inoperative position. Pivoted about the axis of the roll 45 are a bail 47 and a knife 48. In its working position, the bail 47 lies between the roll 45 and the knife 48, and under the web 38 so as to separate it from the roll 39 in order that the end may be conveniently grasped for drawing- off. The knife 48 during this operation is tilted away from the roll 39, but is then pressed against it while the paper is torn off.