Patent GB-462047-A (GB)
Title: Apparatus for effecting inking in a rotary intaglio printing machine
IPC: B41F9/06
Filed: 1935-05-27
Abstract: 462,047. Printing-machines. HOE & CO., Ltd., R. May 27, 1935, No. 15430. Convention date, May 25, 1934. [Class 100 (ii)] Inking - apparatus for a rotary intaglio-printing machine having a reciprocating doctor comprises a casing which together with the blade encloses the major part of the printing cylinder, and has parts which are movable to enable the casing to be opened to permit removal of the cylinder, the doctor blade and mechanism for reciprocating it being supported independently of the casing, and all parts of the casing being out of contact with the printing surface of the cylinder. The casing comprises a main body portion 17 having a concave part 18 containing ink into which the printing cylinder 15 slips, and a side wall portion 29 connected to the portion 17 by spring hinges 25 and provided with a cover plate 34. End walls 31, 32 provided on the portions 29, 17 abut along the line 21. To the upper edge of the portion 17 is hinged a further portion 38 extending beyond the ends of the cylinder 15 and comprising a side wall 44, end walls 46 having arcuate faces 47 of the curvature of the cylinder, and a bottom wall 49 provided with openings 50 through which ink removed by the doctor 76 is returned to the fountain. An arcuate member 52 to which is secured a plate 53 is carried by the portion 38 and serves to remove surplus ink from the cylinder and spread the remainder in a thin film before it reaches the doctor 76, thus permitting of a reduced pressure of the doctor on the cylinder. The ends of the fountain are closed about the shaft or trunnions of the cylinder 15 by members 84 having arcuate portions 85 embracing the shaft, and arcuate portions 84<1> of the curvature of the cylinder engaging the upper edges of the wall portions 23, 32. The members 84 engage in an opening 87 in the wall portions 23, 32 and have lugs 88 by which they are secured by screws 89 to these wall portions. Arcuate parts 48 carried by the members 84 engage the arcuate faces 47 of the fountain portion 38 and support the ends of the doctor. The doctor 76 is clamped to a holder engaging in an opening 58 in the wall 44 and having a part 61 secured by screws 69 in slots 62 in arms 63 on a shaft 65. This shaft is supported on brackets 67 adjustable by screws 82 towards and away from the cylinder and adapted to be reciprocated on guides 80 by any suitable mechanism. Ink is supplied to the casing through a number of openings 105 from a reservoir by means of a pump and a pipe which is provided with a byepass to the supply side of the pump through a spring relief valve. A manually controlled valve is also provided in the pipe to regulate the rate of supply. An outlet pipe 124 extending above the bottom of the casing so as to maintain a definite level of the ink therein is connected to a filter from which the ink is pumped by a second pump back to the reservoir. The capacity of the second pump is slightly greater than that of the first pump. A baffle 107 arranged above the openings 105 conducts the entering ink into the concave part 18 of the casing.