Patent GB-491451-A (GB)
Title: Improvements in or relating to inking mechanisms for rotary intaglio printing presses
IPC: B41F9/06
Filed: 1937-03-01
Abstract: 491,451. Printing - machines. GOSS FOSTER, Ltd. March 1, 1937, No. 6095. Convention date, March 9, 1936. [Class 100 (ii)] Inking-apparatus.-In a rotary intaglio printing-machine having inking-mechanism which includes an inking-head of the kind provided with a pivotal mounting adapted to allow it to be moved into and away from its operative position and a nozzle adapted to extend along the design cylinder and to emit a sheet of ink against the cylinder, means are provided for counterbalancing the weight of the head as it is moved about its pivotal mounting. The design cylinder 1 is shown in an ink fountain 15 of the closed type wherein the doctor blade 12 acts as one closing wall, the surplus ink draining through a perforated screen 19 to pipes 18 arranged at low drainage points, and being conveyed to a circulating pump or other ink-supply means. A carrier 27, comprising a vertically disposed plate extending across the width of the machine, is mounted on a number of horizontal pivots 28 on the fountain 15, and is shaped at the sides and bottom to fit accurately against the machine frame sides and the top of the foun- . tain. The inking-head comprises an inking- nozzle bolted to the top plate 52 of a substantially T-shaped member, the vertical plate 37 of the latter being bolted to the carrier 27. The plate 52 rests on several adjusting-screws 45 which are screwed into the carrier 27, and the set screws 39 which bolt the plate 37 to the carrier pass through elongated holes in the latter, whereby a fine vertical adjustment of the inking-head can be obtained. At each end of the carrier 27 is a pair of lugs 83 pivotally supporting at 82 a socket 81 within which are nested the upper ends of a pair of rods 85. The lower ends of the rods project through pivotally mounted guides 89 mounted on the machine frame. Strong compression springs 93 on the rods are compressed between the guides and socket. The pivots 82 are above and on the inside of the pivots 28 of the carrier 27, so that the carrier and inking-head are held resiliently in operative position. As the inking-head is swung outwardly on the pivots 28, the springs 93, are, when the pivots 82 get below the pivots 28, compressed by the sockets 81, and the weight of the inking-head is more or less counterbalanced. The inknozzle comprises a channelled plate 51 shaped to fit and bolted to the supporting plate 52 as shown, and formed with ink channels leading from an ink inlet 67 to a front lip 59. The top of the plate 51 is covered by a flat plate 56 having a forward edge 58 which is downwardly inclined to form, with the lip 59, the nozzle slot. A sealing-strip 60 on the plate 5 prevents the escape of ink, and a splash-plate 61 is mounted on the inside of the inking- head. The ink is fed to the nozzle by a short pipe 68 slidably mounted in a connection 69 which is bolted to the carrier 27. The lower end of the connection 69 has secured thereto a short horizontal pipe concentric with the pivots 28 of the carrier 27 and rotatably mounted in a hollow bracket connection secured to the fountain 15. The bracket connection is connected to a pipe 77 which communicates with the ink-circulating pump. Specifications 440,748, 440,773, and 441,971 are referred to.