Patent GB-766026-A (GB)
Title: Improved method of and means for making imprints on the backs of book-covers
IPC: B41B1/00
Filed: 1955-03-25
Abstract: 766,026. Colour embossing or printing. HASSLER, E. Y., and ROHDIN, J. O. March 25, 1955 [April 3, 1954], No. 8873/55. Classes 100(2) and 100(3) A method of printing or colour embossing on the backs of book covers consists in setting the title &c. to be printed by means of loose type in a chase 1, the chase being placed for this purpose in a composing table 8, Fig. 2, having adjusting members 11 slidably movable symmetrically about a plane of reference e.g. the centre plane of the chase and adapted to adjust each type line so as to be symmetrical, about this plane. The type is then locked in position and the chase is placed in a carrier on the block of a platen printing machine, Fig. 3, the table 15 of which has side guides interconnected to move symmetrically about a plane of reference which is adjusted to coincide with the plane of reference of the chase held on the block. Chases:-The chase 1, Fig. 1, comprises a rigid frame the side members of which are formed with guide channels 7. A cross bar 3 is secured to one end, the ends of the cross-bar being bent upwardly at 4 for a purpose later to be described. The clamping screws 5 pass through the other end wall 2 and openings 6 are provided in this wall for guide pins on the end spacer member used for filling the chase. Composing table:-The composing table comprises side guides 9, Fig. 2 having inturned flanges 10 for engagement in the channels 7 of the chase 1. The table is mounted on a transverse axis on a bracket 12 so that it may be tilted into a substantially vertical position for setting the type. As each line 13 of type is set the interconnected adjusting members 11 are closed together to move the line of type to the central position. The members 11 may be interconnected by toothed racks co-operating with a central pinion. The chase is slidden along to bring each line of type into alignment with members 11 and centralized thereby. When all the necessary types are set the chase is filled with spacers and clamped up. Platen printing and embossing processes:-The block 14, Fig. 3 of the press has side bars 16 each having an inturned lip 16a for engagement with the channels 7 of the chase. Two bars are provided on each side so that two chases may be mounted on the block. On one side the bars 16 are resiliently mounted to facilitate insertion of the chases, screws 19 being provided to tighten the bars and lock the chase in position when adjusted. The position of each chase in the block. is shown by the ends 4 of cross-bar 3 which project as an indicating tab. A slidable rule 21 mounted on the block has a marker 20 to which the tab of the chase is adjusted. The rule 21 is connected through a U-shaped end piece 23, a pin 24, blocks 25, 27 and slidable rod 28 with a stop 30 for the upper edge of the book cover. As the stop 30 is displaced to suit books of different height the rule is correspondingly displaced so that when the chases are adjusted to register with marker 20 the printed impression will always be at the same distance below the top edge irrespective of the size of the book. A stop 40 co-operates with the lower edge of the book cover. Side guides 35, 36 for locating the book cover sideways are mounted on slides in grooves 33, 34 and are interconnected by toothed racks and a central pinion to move symmetrically on.either side of the central plane of the table. This is made to align with the central plane of the type in the chase by a screw 41 adapted to displace the table. The interconnecting pinion may be locked by a turn-screw 47 so as to secure the side guides in adjusted position. When the printing is effected by gold blocking the block 14 is heated by internal heaters. To avoid stresses the chase is heated before insertion and inserted with a shovel-like tool.