Patent GB-191208606-A (GB)
Title: Printing Presses.
Inventor: WARNOCK WALLACE SAMUEL
IPC: B41F3/42
Filed: 1912-04-11
Granted: 1913-02-20
Abstract: 8606. Warnock, W. S. April 11. Rotary machines; tripping-arrangements. - A printing - machine is constructed with a number of impression surfaces on one cylinder and with means for feeding sheets separately to each surface and with a corresponding number of printing-cylinders which may each be arranged for printing in conjunction with one impression surface only, for printing in several colours on each sheet carried bv the impression cylinder. In the former arrangement, the printing-cylinders may be tripped individually or collectively when required, and in the latter case they may be collectively tripped when desired. As shown, an impression cylinder 1, is fitted with two impression surfaces coacting with printing - cylinders 10, 11, and receives sheets from two feed-boards 6, 7. The printing- cylinders are mounted in journal boxes 13, which can slide in guides 14 radial to the impression cylinder, and the cylinders are maintained in the printing positions by eccentrics 16, which can be rotated by arms 17, rods 18, and arms 19 on shafts 84 when the printing-cylinders are to fall by gravity out of printing position. When the cylinders 10, 11 are each to print on one sheet only, they are arranged to be tripped for alternate revolutions, corresponding to semirevolutions of the cylinder 1, by moving a handlever 71 to its right-hand position, as shown in Fig. 1, so as to engage a roller 25 on a cam follower 23, Fig. 8, with a groove 26 in a cam 27 integral with a disk 33, cam 45 and clutchmember 77 to be described, whereby the follower 23 is reciprocated. The mechanism is duplicated so that each cylinder is normally tripped for alternate revolutions, by a rack 21 normally connected to the follower 23 by a pin 24 in a spring-controlled yoke 25<1>. The rack 21 engages a pin 20 on the shaft 84. When it is desired to trip the cylinders 10 or 11, an arm 36, Fig. 8, is raised to cause a roller 35 to act on a shoe 34 on the yoke 25<1>, and thereby to break connexion between the follower 23 and rack 21. The arm 36 is operated by moving a pin 43 on an integral arm 37 laterally into the path of the cam 45. This pin is formed integral with a groove cam 42 operated by a spring-controlled helical cam 41 mounted in the arm 37 and connected to an arm 44, which is connected by a bell-crank 46 and other bell-cranks and rods to a spring-controlled treadle 53. Separate treadles 53 permit each cylinder to be tripped individually, but treadles 54 are arranged to trip both cylinders. The treadles 54 are not affected by movements of the treadles 53. When it is desired to print from each cylinder on to all the sheets carried by the impression cylinder 1, the lever 71, Fig. 1, is moved to the left, thereby moving the parts 27, 33, 45, 77 towards the centre of the machine, the cams 27 being disengaged from rolls 25 on the followers 23, and plain grooves in the disks 33 engaging the rolls 31 on the other sides of the followers to cause the printing-cylinders to remain in constant action. The movement of the lever 71 also throws in clutches 82, 83 for permitting the shaft 84 to be operated by racks 88 when it is required to trip the cylinders with this arrangement of printing. To effect this tripping, one of the treadles 54 is depressed and operates through an arm 70, a rod 92, or swinging arm 93, connected with lost motion a rod 94 and a bell-crank 95 to remove a roll from a cam groove 98 in a clutch element 78, which, when the roll is removed is moved laterally by a spring to cause the clutch elements 77, 78 to engage. The racks 88 are thereby moved by cams 91 to trip the cylinders, and cams 45<1> similar to the cams 45 break connexion between the followers 23 and racks 21 to permit the shaft 84 to rotate to effect the tripping. A spring- pressed detent is used to prevent the cam 91 from creeping.