Patent GB-973020-A (GB)
Title: Improvements in or relating to machines for use in the preparation of copies on light or heat sensitive sheets
IPC: G03B27/22
Filed: 1962-04-24
Abstract: 973,020. Copying apparatus. W. RITZERFELD, and G. RITZERFELD. April 24, 1962 [July 27, 1961], No. 15514/62. Heading G2A. A copying machine comprises a rotatable cylinder of light permeable material, adapted to carry the original text to be copied, a source of short or long wave length light (3. 6 x 10<-7> - 1 x 10<-8> metres and 4 x 10<-4> - 7. 5 Î 10<-7> metres respectively) within the cylinder, means for feeding a copy sheet into contact with the original text when on the cylinder, for exposure to light passing through the original text, means defining an elongated aperture positioned in the path of movement of the copy sheet, the aperture controlling irradiation of the copying sheet by light from the light source or from an additional source, and means for selecting lines or sections of the original text for copying. In the embodiment shown in Fig. 5 an original 3 to be copied is held round a transparent rotatable drum 1 which encloses an exposure lamp 30. The light sensitive copy sheet 7 is fed by means of rollers under a mercury vapour lamp 23 round part of the drum where it is in contact with the original, through a developing bath 33 and on to a drying platform, heated by infra red lamps 38, 39, which is subsequently rotated upwards by means of solenoid 40 so that the sheet passes out of the apparatus. The sheet and drum driving means are controlled by an electric motor. The lamp 23 has a shutter 70 in front of it which is controlled by a number of keys T1-T11 connected to contact studs K1-K11 which are explored by a rotating contact 14 connected by gears 11, 12 to the drum shaft, so that selected sections of sheet 7 corresponding to certain lines on original 4 are exposed before the sheet reaches drum 1 so that no copy can be produced on these parts. Alternatively lamp 23 and shutter 70 may be replaced by a flash lamp also controlled by keys T1-T11. The shutter may be arranged in front of lamp 30 and not lamp 23. Further, marks may be fixed to the original which reflect light from lamp 67 on to photo-cell 68 which operates shutter 70. In another embodiment a slotted mask is placed between lamp 30, which is replaced by a flash lamp, and the original. The lamp may be controlled by keys T1-T11 or marks on the original as before. Mercury vapour lamp 30 may also be replaced by an infra-red lamp in which case the copy sheet is heat sensitive. In this last case a roller is provided to press the copy sheet against the original but this roller is controlled by an electromagnet which in turn is controlled by keys T1-T11 or by the photo-cell 68 as before. A pivoted skipping member for separating the original and the copy sheet is provided. The pressure roller control method can also be used when lamp 30 is a mercury vapour lamp. The pressure roller may be replaced see Fig. 11 by a rotating disc 55 with movable segments 56 which are controlled by keys T1-T11 so that only selected segments project in such a way as to exert a pressure on copy sheet 7 to urge it against the original. A shielding mask 57 is provided.