Patent GB-189914994-A (GB)
Title: Improvements in Presses for Printing or Embossing.
Inventor: JOHNSTON JOSEPH YARDLEY
Filed: 1899-07-20
Granted: 1900-07-20
Abstract: 14,994. Johnston, J. Y. July 20. Embossing and stamping.-Relates to presses of the kind described in Specifications No. 16,704, A.D. 1893, and No. 14,664, A.D. 1894, for printing or embossing paper or other material by means of dies supplied with ink, colour, or the like. Fig. 23 shows a sectional view of the upper part of a press, with the die-arm in two positions. The upper die 1 is attached to a block 2, having a square shank 3 which slides within an aperture formed partly in the die-arm j and partly in a detachable cap-piece; the block 2 is normally held in a raised position by springs 5. Clamping-jaws are secured to the underside of the block 2, and are adjusted by means of a right and left handed screw 8, so as to grip the die 1. An adjustable index-plate 10, provided with recesses or apertures which engage with the pointed end of a screw pin, serves to regulate the position of the die in a. direction at right-angles to the screw 8. Other suitable means may be employed for holding and adjusting the die. The die-arm j is mounted upon a shaft k, rotated by means of a bevel-wheel l and bevel teeth m formed upon a pinion i, which engages with a pinion h secured to the main shaft a. This shaft a can be stopped and started by means of a spring-controlled clutch which is connected to a hand-lever. The bevel teeth m are formed on about two-thirds of the wheel i, so as to cause the arm j to make a complete revolution and then allow the arm to rest during the printing or embossing operation. While the impression is taking place, the die-arm is firmly held in the correct position by means of a stop or projection n which engages with a forked - shaped block o, fitted to slide within a bracket p. The block o is forced downwards, so as to lock the stop n, by a spring t, and, after the printing or embossing operation, is raised by a lever u, which is pivoted at v, and is oscillated by a cam x fixed to the pinion i. At the beginning of every revolution of the arm j, an initial slow motion is given to the arm before the teeth of the bevel-wheel l engage with the teeth m, by means of two wedgeshaped projections fitted respectively to the lever u, and wheel l; during the oscillation of the lever u, the projections bear against each other laterally and the arm j is pushed aside. Figs. 6 and 9 respectively represent, in plan and sectional elevation, the mechanism for actuating the dieblock 2. A removable steel block 49, Fig. 23, is fitted within a cavity in the shanks 3, and is struck, during the printing operation, by a steel disc 48, Fig. 9, fitted to the lower end of a screw 15, which works within a long nut secured to the upper part of the press framing. The screw 15 carries a pinion 18 which gears with two racks 24, sliding in guides 25 secured within a cylindrical casing attached to the framing. The racks 24 work within tubular casings 26, Fig. 6, fitted with springs 27, the tension of which can be regulated by means of screws 29 and hand-wheels 31. A toothed wheel 20, loosely mounted upon the screw 15, is continuously rotated by a pinion 38, which is secured to a vertical shaft 37, driven by bevel gearing 35, 36, Fig.23. A flywheel 21 is secured to the screw 15. The wheel 20 is intermittently connected to the screw 15 by the action of a cam 44, fixed to the wheel 20, and adapted to engage with a roller 40, mounted upon a link 39, which is pivoted to an arm 19 on the screw. During this engagement of the roller 40 with the cam 44, the screw 15 is raised and the springs 27 are compressed. A curved guide 43 and a stop plate 45 are fitted within the casing 13, and, as the revolution of the arm 19 continues, a roller 42, mounted upon the leading end of the link 39, strikes against the stop 45, and the cam 44 releases the roller 40. Simultaneously with the releasing of the roller 40, the link 39 is locked by means of a third roller 41, which is forced against the guide 43 and passes into a curved recess formed in its front end, as shown in Fig. 18. A tripping-piece 47, secured to the wheel 20, effects the release of the link 39 and screw 15, so as to allow the latter to descend and deliver a blow to the block 2 ; or the front end of the guide may be so formed as to allow the link 39 to be released, at the proper time, without the aid of a tripping-piece. The impact between the die 1 and the paper or other material causes a quick rebound of the die, and, as some time elapses before the cam 44 again engages with the roller 40, the screw 15, with the die 1, is liable to descend and give a second impression ; this is prevented by means of racks fixed to the flywheel 21, and arranged to engage with spring-controlled pawls mounted on the casing 13. The mechanism for actuating the die-block is described in Specification No. 14,918, A.D. 1899. After an impression has been made, the paper &c. is prevented from sticking to the die 1 by plates 61, Fig. 23, adjustably mounted upon a sliding-pin 60 which carries a plate 62 at its lower end. The pin 60 is actuated by means of a cam 66, carried by the shaft k, and bearing upon rollers 65 mounted on the plate 62. Rollers 63, mounted on the plate 62, travel upon a part of the machine framing, and prevent the pin 60 from rotating. This apparatus for holding the paper &c. is described in Specification No. 14,992, A.D. 1899. Fig. 43 shows the inking-apparatus. The ink reservoir 85 is removably attached to a table 84, being provided with pins 95 which fit within tubes 83, which are secured to the table 84 and pass through apertures in a frame 80 ; the lower parts of the tubes 83 are secured to a plate 86. Springs 88 surround the tubes 83, and tend to lift the table 84 to a height determined by a screw 89. The frame 80 is supported by means of adjustable screws 81, and can be adjusted, in a direction at right-angles to the plane of the paper, by means of a screw 89. An ink-trough roller 96 is mounted upon a spindle 101, one end of which, is supported by an adjustable screw 105, the opposite end being provided with a sprocket-wheel 120, driven by means of toothed and chain gearing from the main shaft. The ink in the reservoir is agitated by means of an oscillating frame 98, which is suspended from studs 100 and actuated by an eccentric 102 secured to the spindle 101. A distributing-roller 109 and an inking-roller 97 are mounted in adjustable bearings, and are driven by frictional contact with the roller 96. Vertically sliding guards 111 are adjustably mounted in the leading ends of the jaws 6, which hold the die 1, and, as the die arm j swings over the inking-roller 97, these guards come in contact with the discs 110 on the roller 97, and depress the inking-apparatus against the resistance of the springs 88, and only allow the inking-roller to rise when the front edge of the die has passed. By this means the leading edge of the die is prevented from being inked, and at the same time does not cut into the roller 97. The dies are described in Specification No. 14,993, A.D. 1899, and similar inking-apparatus is described in Specification No. 14,820, A.D. 1899. After the die has been inked, it is wiped by a strip of hard, smooth paper, or other suitable material, stretched over a soft and elastic pad which is mounted upon a table carried by a vertically-movable frame. The table is adjustably mounted upon yielding supports. The wiping-strip travels intermittently from a roll and, after use, is wound upon a collapsab!e roller comprising two semi-cylindrical halves hinged together at one side and provided with spring-controlled filling-pieces at the opposite side. When the collapsable roller is full, the paper &c. can be readily removed by displacing the filling-pieces so as to allow the halves of the roller to swing towards each other. The feed of the wiping-strip is effected by means of a feedroller which is forced by springs against a larger feed-roller mounted in the vertically-movable frame and above the collapsable roller ; the large feed-roller and the collapsable roller are rotated simultaneously by means of pawl and ratchet mechanism. The entire wiping-apparatus is lifted to press the strip against the die by means of a cam 205, Fig. 23. The height to which the wiping-apparatus is lifted is regulated by adjusting a block which slides beneath an inclined portion of a lever forming part of the lifting-mechanism. Ink is removed from the wiping-strip by an adjustable scraper or plate, or by other scraping-arrangements The wiping-mechanism and arrangements connected therewith are also described in Specification No. 14,991. A.D. 1899. The counter-die is cemented upon a loose metal plate fitted between the ends of hooked bars which are secured to the machine framing. A pin enters a recess formed in the metal plate, and prevents it from being laid upon the framing in a wrong position. If required, the machine may be used for plain embossing work, in which case the inking and wiping mechanisms are not used, the pinion h being disengaged from the wheel i, Fig. 23, by sliding the pinion along the shaft a.