Patent GB-714493-A (GB)
Title: Method and apparatus for correction and make-up of type matter for planographic printing processes
IPC: B41B23/00
Filed: 1951-01-17
Abstract: 714,493. Photographic type-composing apparatus. INTERTYPE, Ltd. Jan. 17, 1951 [Jan. 19, 1950], No. 1274/51. Class 98(1) [Also in Group VIII] In the production of a forme from which a printing plate is to be made, the forme comprising lines of type matter of the same or different type-sizes produced in columnwise succession on a photographically sensitized sheet in a photographic typecomposing machine, the sheet is perforated within its opposite edges relative to each line while the sheet is stationary before or after photographic production of each line, and the perforations are used to locate the developed sheet for further treatment, e.g. for punching therefrom a strip bearing a faulty line, inserting a similarly produced, located, and punched substitute strip bearing the correct line in the opening left by the removal of the faulty line-strip, the walls of the opening being used as abutments for locating the inserted strip in the plane of the sheet, and securing the inserted strip to the sheet. As shown in Fig. 6, holes are punched at both ends of each line by punches 32 and 33 disposed in the film-holder 16 and operated and immediately withdrawn upon completion of each line of exposures. The punches are coupled to the ends of levers 39, 37, the levers being pivoted at 40, 38, and the lever 39 being coupled at its lower end to the cross pin 41 in the lever 37. The forked end of the pawl 42 pivoted to the lever 37 is provided with a shoulder banking against the right-hand edge of the lever 37 to prevent rocking of the pawl clockwise from a horizontal position. A cam 46 secured to the film holder guide plate 16a lies in the path of a roller 47 disposed at the free end of the pawl 42. As the film holder descends from its line-starting position as successive typeelements are removed from the composed line and recorded on the film, the roller 47 contacts the cam 46 and the pawl 42 rocks anticlockwise and flexes the bow spring 44 without operating the levers 37, 39. On the return movement of the film holder, the pawl is held rigid and rocks the levers 37 and 39 when the roller 47 contacts the cam 46 to punch holes at each end of the recorded line. The punches are immediately withdrawn by the action of the spring 45 on the lever 37. Punching may be suspended by manual rotation of the pawl 42 to a vertical position. As shown in Fig. 33, the punches are operated before the start of each new line of exposures and remain engaged until the line is recorded and the film holder is returned to its uppermost line-starting position. The lever 180 carrying the lower punch is provided with a roller 181 co-operating with a box cam 182 secured to the guide plate 16a. The spring 184 normally urges the lever 180, and consequently the lever 39 to film-punching position, the lever 180 only being rocked to retract the punches to permit film advancement when the roller 181 enters the cam 182. The film holder may be removed from the machine by removing the cam bracket 183, a manually-operated catch being provided for holding the punches inactive. A film holder of different width may be substituted. The perforations are utilized to locate the film in a punch, as described in Specification 714,566, [Group VIII], adapted to shear out faulty lines from the film. Such faulty lines are replaced with corrected lines sheared by the punch from a secondary correcting sheet also provided with perforations, the replacement being effected on a vacuum box as described in Specification 714,570. Specifications 590,533, 650,630 and 678,475 also are referred to.