GB208925A - Improvements in or relating to means for use in the photographic production of typographical printing surfaces - Google Patents

Abstract

208,925. Linotype & Machinery, Ltd., and Banks, J. N. Jan. 9, 1923. Photo-mechanical printing-surfaces.-In the production of typographical printing-surfaces, film strips 4, Figs. 2 and 3, bearing representations of the type matter, are attached in parallel columns to a glass plate 1 by the engagement of perforations 5 in their edges with pins 3 fast to the plate, and are photographed on to a sensitized zinc, aluminium, or other printing plate, the matter showing through the glass plate. The edges 7, Fig. 5, of the strips may be serrated so that the edges of adjacent strips can be intercalated between each other, with their perforations 5 engaging alternate pins. A column of strip may be formed of one or more pieces so that faulty parts may be cut out and replaced bv correct pieces. The pins 3 are formed by studs in parallel rods 2 embedded in the glass plate and enamelled or otherwise prepared at their embedded edges so as to produce the column-dividing lines in the printed matter, or these lines may be produced by having black lines or narrow white strips or white lines on narrow black strips on the surface of the glass according as the matter on the film strips 4 is positive or negative. The glass plate 1 may have permanently depicted thereon matter such as the title of a newspaper, which appears as a permanent feature of the ultimate print. The assembled forme is closely backed by a wood or metal sheet 8, Fig. 3, having grooves 9 to bridge over the pins, and painted white.