Patent GB-190001805-A (GB)
Title: Improvements in Multi-colour Printing Machines.
Inventor: KOEHLER FRANZ RICHARD EMIL
Filed: 1900-01-29
Granted: 1900-12-22
Abstract: 1805. Koehler, F. R. E. Jan. 29. Printing in several colours.-Relates to machines for printing pictures, bill-posters, wall papers, and the like, and more especially to machines of the kind described in Specifications Nos. 8753 and 15,555, A.D. 1899. In order to facilitate the removal, when desired, of a printing- roller, a series of washers f, Fig. 1, is placed upon the shaft b, between one end of the printing- roller a and bearings c mounted adjustably in the framing d. The table or bed and corresponding racks of a flat bed machine may be provided with removable extensions, and the printing-roller frames of a rotary machine may be adjustable with respect to each other so as to allow printing-rollers of various diameters to be employed. A flat bed machine may be provided with three printing- rollers, which print upon a web or sheets fed to an intermittently-rotating octagonal drum, the eight plane surfaces of which serve in succession as impression surfaces. The printing-plates may be held in position on the printing-roller a, Fig. 5, by clamping-plates b having slotted fingers d which can be adjustably secured to the roller by means of screws e. When one colour is to be superposed upon another, the machine may be provided with an intermediate roller having an absorbent surface and intended to remove superfluous colour from the paper, or superfluous colour may be removed from the second printing-roller by means of the absorbent roller. The absorbent parts are in relief, and correspond in form with those portions of the inked surface whence the superfluous colour is to be removed. In rotary machines, a large impression cylinder may be used, any convenient number of series of printing-rollers being arranged round the cylinder. Any printing-roller may be supplied with several colours by means of series of inking-rollers mounted between partitions fitted removably within a frame. Fig. 12 shows one form of inking-apparatus in cross-section ; this comprises inking-rollers b, distributing-rollers c, and ductor roller d, which receives ink from a trough e, made up of any desired number of sections with division plates. These sections and division plates are mounted upon a bar g, and are clamped by any convenient means, such as collars and set-screws. The front edges of the division plates enter grooves k formed in the roller d, or between sections of this roller. The distributing- rollers are preferably made in sections and provided with division plates j, which enter the grooves k, and grooves l formed in the rollers b. An ink duct provided with removable thin metal ducts, may also be employed. A series of small rollers, mounted on a yielding arm and bearing upon the rollers b, c, d, may replace the plates j and grooves k, l. The Provisional Specification states also that the printing-rollers may be heated by means of gas, hot air, or other fluid; that the rollers may be provided with threaded ends to receive the toothed driving-wheels ; that, in machines having printing- rollers mounted in a frame, the pressure may be regulated by means of V or other shaped guides on the frame ; and that a cutter blade, or row of pins, may be employed in web-printing machines for cutting, or perforating, the web ; the blade or pins are carried by a yielding plate, which may also serve as a gripper, when sheets are being printed.