Patent GB-490540-A (GB)
Title: Improvements in or relating to inking mechanisms for rotary intaglio printing presses
IPC: B41F9/10
Filed: 1937-02-18
Abstract: 490,540. Printing-machines. GOSS FOSTER, Ltd. (Goss Printing Press Co.) Feb. 18, 1937, No. 4897. [Class 100 (ii)] Inking-apparatus.-Doctor-blade mechanism for rotary intaglio printing-presses comprises a rod to which both a reciprocating and a rotatable movement can be imparted, a doctorblade support mounted on the rod, and fixed and loose members on the rod with means for exerting regulable pressure between them for urging the doctor-blade against the design cylinder. As shown, the supporting frame for the doctor-blade mechanism is applied to a press of the closed ink fountain type, and is mounted on the main frame 3 of the press and also on the top of the ink fountain casing 4 by means of bolts passing through elongated holes, whereby the doctor-blade mechanism can be adjusted vertically with respect to the design cylinder 1. The frame comprises a curved wall 9 bolted at 15 to the fountain casing 4 and extending across the press, and end plates 10 provided with ribs 11 bolted to guides 12 on the press frame 3. The doctorblade is carried on a rod 23 mounted in pedestal bearings 24 on the frame 9, 10, the doctorblade support comprising collars 28 pinned to the rod and integral with a rail 31 which extends across the press and is recessed to receive the doctor-blade 34 and two clamp plates 32, 33, which are all clamped to the rail by a number of fingers 39. Adjusting- screws on the rail facilitate fine adjustment of the plates 32, 33 and doctor-blade 34. The doctor-blade is flexed by a plate 57 secured to the clamp plate 33, and a resilient backing- blade 59 held between plates 60, 61 secured to the wall 9 supports the doctor-blade from below. The doctor-blade is pressed resiliently against the cylinder 1, and means is provided whereby the doctor-blade can be moved into and out of operative position without disturbing the setting of the pressure means. As shown, a U-shaped frame 71 is fastened at both its ends to the two central collars 28 fixed on the rod 23, and another U-shaped frame 74 has its ends journalled on the rod 23 and fitting against the outside faces of the two collars 28. The frame 74 is beneath the frame 71, and is fixed against angular movement about the rod 23. A pivoted nut 83 in the frame 74 is engaged by a screw-rod 85, and a housing 96 pivoted to the frame 71 carries an adjustable spring thrust means comprising a spring 93, a thrust ball bearing, and a member 94 having screw-threaded engagement with the housing for adjusting the pressure which the spring exerts on the rod 85 through a collar 89 thereon. The two frames are thus pressed apart, but since the frame 74 is fixed, and the frame 71 is secured to the rod 23, the latter is turned to press the doctor-blade resiliently into contact with the cylinder 1. The pressure is varied by turning the hand wheel 95 on the member 94. To move the doctor-blade out of contact with the cylinder, the rod 85 is turned by means of a crank 98 thereon to advance through the nut 83. A lock-nut 86 on the rod acts as a stop means, whereby the greatest distance between the frames 71, 74 is determined. The doctor-blade is reciprocated longitudinally of the cylinder 1 by means of barrel cams on a shaft journalled in the press frame 3, the cams actuating pivoted two-armed levers which are connected to the arms of the U-shaped frame 74 by links. The frame 74, since it embraces the frame 71 secured to the rod 23, imparts its longitudinal reciprocation to that rod, and hence to the doctor-blade 34.