Patent GB-922357-A (GB)
Title: Improvements in or relating to apparatus for use in the preparation of printing master sheets
IPC: G03D9/00
Filed: 1961-04-26
Abstract: 922,357. Photographic copying-apparatus. W. RITZERFELD, and G. RITZERFELD. April 26, 1961 [April 29, 1960; Aug. 26, 1960], No. 15069/60. Class 98 (1). A copying-apparatus in which an exposed light-sensitive sheet is conveyed through a developing bath has a pair of pressing rollers at the exit from the bath, and two supporting means for further sheets so arranged that the two sheets, each on one of the said supporting means, are kept out of contact with each other until at or shortly before the bight of the pressing rollers. In the form shown in Fig. 1 the apparatus is built up on a base plate 1 having side walls 2, 3, and are movable housing 4. On the upper part of the housing is a contact-printing section 40, where a copy of an original may be made on a light-sensitive sheet 34. This sheet is now fed into the apparatus on table 9, face upwards, and transported through a developer tank 5 between grid guides 7, 8, which direct it on emergence towards a pair of transport rollers 19, 20. These rollers pass the sheet 34 on along a guide table 12 towards a further pair of rollers 21, 22. Meanwhile, a transfer sheet 35, such as a hectographic ink sheet, has been laid coated side down on support table 13, with a downwardly folded-over leading edge 36 adjacent the bight of rollers 21, 22, in such a position that this folded-over edge is engaged by the leading edge of sheet 34 as it progresses forward. The two sheets thus pass together between rollers 21, 22 (the lower of which is heated by a resistance heater), and out of the apparatus over a discharge table 14. The sheet 35, which now carries an image transferred from the developed sheet 34, is separated from the latter, and placed, face upwards, on table 10. A printing master sheet blank 37 is placed on a further support table 11, its leading edge engaging in the fold of sheet 35, and the two sheets pressed together by passing them between rollers 19, 20. They are then deflected to pass out of the apparatus by a movable deflecting plate 38. The master sheet 37 has now received the printing image from the transfer sheet 35. In the modification of Fig. 3, the exposed light-sensitive sheet 34 is passed into the apparatus along table 9, and through the developer tank towards rollers 62, 63. The transfer ink sheet 35 is placed on table 56, in a similar manner to the previous arrangement, and the two together passed between rollers 62, 63 and out of the apparatus. Transfer sheet 35 is separated from the exposed sheet 34 and then once more placed on table 56, but the other way up. The master sheet blank 37 is placed on table 57, and the two sheets 35, 37 fed between rollers 62, 63, to produce a final transfer image on sheet 37 which is now useable for hectographic printing. (When sheet 35 is placed on table 56, the overlying table 57 may be temporarily swung upwards out of the way, to the position shown in dotted lines.) As an alternative, the hectographic ink transfer sheet 35 may instead be a fatty-layer transfer sheet, and the master sheet blank 37 may be a lithographic master.