Patent GB-190605220-A (GB)
Title: Improvements in Platen Printing Machines.
Filed: 1906-03-03
Granted: 1907-01-31
Abstract: 5220. Dorman, W. H., and Dorman & Co., W. H. March 3. Platen presses ; inking-apparatus.- Relates to platen presses of the "Caxton" type, and particularly to means whereby the travelling formeinking rollers are reinked at both h ends of their travel, and to the frisket fingers. The machine comprises a frame A, driving- shaft B, and cam shaft C, which by means of a lever D, gab E, rock.shaft F, arms G, and links H operates the forme roller-carriage I in the usual manner. Within the base of the frame A is provided a second ink-duct a adjustable backward and forward relatively to the frame, and comprising a ductor roller a' against which a blade is pressed by screws. The ductor roller is rotated intermittently by means of a cam a<5> on the shaft C, a lever a<7>, and a link a<8>, which operates an arm a<12> carrying a gab a<13>, adapted to engage a pin on a lever mounted loosely on the roller spindle. This lever is furnished with a pawl adapted to engage a ratchetwheel on the roller spindle, an adjustable guard-plate being mounted at the side of the ratchet-wheel, temporarily to disengage the pawl and regulate the rotation of the ductor roller a<4>. Ink is conveyed from the roller a<4> to distributing-drums c, c<1> by a roller b<10>, carried in an arm b<1> oscillated by means of a cam b<7> on the shaft C, a lever b<4>, and a link b<3>, The drums c, c<1>, Fig. 4, are mounted on stationary shafts c<2> and are driven by means of gear-wheels c<7>, c<20>, to which they are connected by sliding pins c<8>, c9. At the other end the drum rotates on a block c<11>, secured to the shaft c<2> by a screw e<12> and provided with a cam-groove c<13>, with which engages a roller c<14> to reciprocate the drum longitudinally. On the screw c<12> being partly withdrawn, the block c<11> is disengaged from the shaft c<2> and locked to the drum c', when the block and drum rotate together without any axial motion. The drums c, c' may be mounted in a dovetailed frame c<3> which slides sideways into the machine, at one end in the main frame A and at the other in a removable frame, or at both ends in bearing-blocks which slide horizontally in slots in the framing A. A distributing roller e<14> mounted in horizontallysliding bearings is pressed by springs against the two drums c, c<1>. The gab E is disengaged from the roller L carried by the arm M, to trip the inking- roller carriage I, by a lever g pivoted on a stud g<1> and operated through a spring drum g<4> by the usual handle g<3>. The lever g is formed with a hook portion g<7>, which, when the lever is operated, causing the lug g<13> to engage the lug g<11> and lift the gab E, engages the pin g<10> on which the roller L is mounted, and locks the roller carriage against movement. The frisket fingers h, Fig. 17, are bolted to a frisket frame h<2> pivoted to the bottom of the platen K. To the bottom of the frame h<2> is pivoted a rod h<10>, which is encircled by a spring h<12> in compression and slides in a socket h<6>, loosely pivoted on the lower end of a lever h<5>, mounted on a stud h' in the main frame A. The motion of the socket h<6> is limited by a stud h<8>, which engages a slot h<9> in the lever h<5> and is normally retained at the end h<23> of the slot by a weak spring h<15> in tension, secured to the frisket frame and to a stud h<16> beneath the platen. As the .platen is withdrawn from the forme, the spring h<12> is slightly compressed, and then, during the rolling motion of the platen, the rod h<10> raises the lever h<5> to the position indicated by dotted lines. In this position, the slot h<9> permits the fingers h to be pulled down on to the platen face for making-ready. In a modification, the frisket fingers are pressed against the platen face by a spring in compression connected to the frisket frame, and are raised from the platen by a roller on the frame engaging the inclined surface of a lever pivoted to the mun frame A. The lever is provided with a handle projecting at the front of the machine, by means of which the lever may be swung out of the path of the roller on the frisket frame, allowing the fingers to fall upon the platen.