Patent GB-122008-A (GB)
Title: Improvements in or relating to Automatic Scraper Control for Rotogravure Printing-presses.
IPC: B41F9/10
Filed: 1918-01-07
Abstract: 122,008. Anglo-American Inventions Syndicate, (Harris Automatic Press Co.). Jan. 7, 1918. Inking - apparatus; stopping and tripping arrangements. - An intaglio printing-machine is provided with mechanism for moving the scraper clear of the printing-surface simultaneously with the throwing off of the impression or the stoppage of the press, the mechanism being controlled either by hand or automatically by a trip device on failure of the sheet feed. In one form, Fig. 1, the intaglio cylinder 8 is mounted in eccentric bearings 18 operated to throw off the impression by toggle levers 20, 21 and link 23 connected to an arm 24 of a rock shaft 25 which is urged by a spring to turn in contra-clockwise direction to throw off the impression but is normally prevented from turning by a latch 29 engaging a notched sleeve on the shaft. The shaft is also provided with a hand-lever 27 for restoring the impression. The scraper 38 is secured to a rockshaft 86 provided with an arm 40 carrying weights 39 for normally holding the. scraper in the operative position, and an arm 42 connected to a link 43 which is provided with a lug 44 engaging a lug 45 on the hub of the hand-lever 27 so that when the shaft 25 is turned to throw off the impression, the shaft 36 is rocked to lift the scraper clear of the cylinder 8. The shaft 25 is released from the latch 29 automatically on failure nf the sheet feed by the tripping mechanism shown in Figs. 1 and 3. A trip lever 58 is pivoted between a pair of disks 52 secured to a shaft 48 which is oscillated by a link 50 from the shaft of the impression cylinder 10. The disks 52 are provided with alined notches 62 adapted to register at each oscillation with a notch 63 in a normally stationary disk 53 carried by a sleeve 54 which is provided with an arm 55 bearing against an arm 56 secured to the shaft carrying the latch 29. The upper end of the trip lever 58 is formed as a tooth 61 and its lower and heavier end rests upon the sheet 47 nn the feed board 46. While sheets are on the feed board 46, the lever 58 oscillates idly but if no sheet is present, its lower end drops into a recess 60 in the feed board and its tooth 61 engages the notches 62, 63 so that the disk 53 is turned and lifts the latch 29 clear of the shaft 25. To throw off the impression by hand, the hand-lever 2 is moved to release the strain on the latch 29 which is then lifted by hand to allow the shaft 25 to be turned by its spring. The scraper may be returned to operative position previous to the restoration of the impression by lifting the link 43 clear of the lug 45. In the form shown in Fig. 4, the scraper is operated simultaneously with the disconnexion of the driving clutch 73, 74 of the machine. The scraper 90 is carried by a rock-shaft 88 carrying an arm 87 provided with a pin 86 engaging a lug 85 on a link 84 which is connected by an arm 79 to a rock-shaft 78 which is provided also with a clutch disengaging lever 80 and a hand-lever 95 which is connected to a trip mechanism operating on failure of the feed similarly to that described in connexion with Figs. 1 and 3. When the hand-lever 95 is raised either manually or by the trip mechanism, the clutch 73, 74 is disconnected to stop the press and scraper 90 is simultaneously moved clear of the printing cylinder 65.