Patent GB-316956-A (GB)
Title: Improvements in and relating to printing presses
IPC: B65H23/188
Filed: 1928-02-01
Abstract: 316,956. Fishburn, T. H. Feb. 1, 1928. Feeding and registering webs.-A high speed rotary printing press is provided with means for feeding a previously printed inset web in register with the webs being printed by the press, such means including a conveyer engaging and travelling with the web for a predetermined period and associated with means for detecting variations of register and causing the operation, electrically or pneumatically, of mechanism for correcting the variations. In one form, Fig. 1, the previously printed inset web 2 which is provided with regularly spaced perforations, passes from a roll 12 between feed rollers 17, 18, over a registering roller 85<b> and thence over the conveyer roller 1 provided with pairs of electric contacts 3, 4 co-operating with an arcuate brush contact 5. The contacts 3, 4 are connected by brushes to rings 22, 23, Figs. 1 and 4, on the machine frame and the rings are connected to relay switches 50, 51 which control the current supply to two electromagnetic clutches 7, 8 fast on a shaft 9 driven by a motor 46. The clutches 7, 8 serve to drive gears 13, 14 normally loose on the shaft 9, and thus to drive through the gear 69 a shaft 70 in one direction or the other. The shaft 70 is connected by a chain 19<a> to a shaft 44a which drives through bevel gears 44 screwed shafts 85<a> carrying the register roller 85b. One shaft 85a also drives by gears 45 a worm 10 engaging a wormwheel 15 on a shaft 16 which is mounted in a screwed bearing so that the shaft moves endwise and thus varies the diameter of an expanding pulley 6 by which the feed rollers 17, 18 are driven. When the inset web is in correct register, the perforations lie between the contacts 3, 4 and the circuits remain open. If the perforations creep beyond or lag behind the correct position, a circuit is closed through the contact 4 or 3 and the brush 5, and the corresponding clutch 7 or 8 is excited. The shafts 85<a> are thus rotated in one direction or the other to correct the register immediately by means of the roller 85<b> and to effect a permanent adjustment of the register by means of the pulley 6. Each relay switch comprises a solenoid 59, Figs. 4 and 5, controlled by the circuit through the contact 3 or 4 and brush 5, and operating an arm 54 to close the switch contacts 6 in the circuit of the clutch 7 or 8, and the contacts 61 are held closed for a definite period by the circular part of a notched disc 53 or 52 frictionally driven by the shaft 70. When one of the notches 57 in the disc lies below the end 56 of the arm 51, the contacts 61 are allowed to open. A hand wheel 43, Fig. 1, is provided on the shaft 44<a> for manual adjustment of the register when desired. Instead of the feed rollers 17, 18, rubber covered rollers may engage the surface of the roll 12. In a modification, the relay switches 50, 51 may control the supply of current to solenoids 20, 21, Fig. 7, the armatures 39, 40 of which are connected to pivoted arms 41, 42 carrying pawls 35, 36 adapted to actuate ratchet wheels 37, 38 and thus turn in one direction or the other a shaft 26 connected by a chain to the shaft 44<a>, Fig. 1. In another form, the conveyer 1 is provided with air ports instead of electric contacts, each port being connected through a bellows with a suction pump. When a perforation in the inset web registers with either of the ports, the suction in the corresponding bellows is destroyed allowing the bellows to expand and close electric contacts which actuate control mechanism as above described. In another form of vacuum controlled mechanism, the ports in the conveyer are connected to cylinders 74, 75, Fig. 13, the pistons of which are adapted to actuate levers 80, 81 to close clutches 82 so that a shaft carrying worms 83, 9<a> is turned in one direction or the other, the worm 83 actuating a quadrant to adjust a registering roller 85 and the worm 9a operating to adjust an expanding pulley 33<a> driving the feed rollers 34a. Instead of vacuum, compressed air may be employed, the air being supplied to an arcuate chamber 86, Fig. 14, cooperating with the ports 76, 77 of the conveyer 1. In this construction, the clutch-operating levers 90, Fig. 16, are connected to a pair of cylinders 87, 88 working on opposite ends of a fixed piston 89. Fig. 17, shows an arrangement for indicating the direction and extent of variation of the web from correct register. This consists of a number of contacts 92 co-operating with the perforations in the web and with the brush contact 5 to close circuits through a set of coloured lamps 93. Specifications 13363/03, 4175/04, 21222/07 and 262,562 are referred to.