Patent GB-669992-A (GB)
Title: Improvements in photographic copying apparatus
IPC: G03B27/22
Filed: 1948-08-06
Abstract: 669,992. Photographic copying apparatus. TRIGGS, W. W. (Diebold, Inc.). Aug. 6, 1948, No. 20867/48. Classes 97 (i), 98 (i) and 98 (ii). The apparatus comprises a cabinet, a copy feeding unit in said cabinet and having platen means along which the copy can be advanced, a slit extending transversely to the direction of the copy feed along said platen, means for illuminating the copy in register with said slit, a camera in which a sensitized film is driven across the focal plane at a predetermined speed related to that of the copy, and a light tunnel between the illuminated image and the camera lens and having walls which are adjustable to vary the cross-sectional area of the tunnel so as to act as a diaphragm. In a modification, the platen means comprises two parts at the first of which the copy is illuminated for photographing by the camera, whereas the second part receives the copy from the first part and is illuminated to make a contact print on a sensitized sheet overlying and travelling with the copy by light passing through the copy. As shown, the apparatus is built-up on a three-drawer rack, the top drawer 17 carrying the document feeding means, the middle one 58 the copying camera, and the bottom 79 a supplementary document conveying means, a delivery shoot for the copied documents extending from the end of the feeding means in the top drawer to the bottom drawer. The document feeding means comprises a table 18, a belt 19 driven by a synchronous motor 33 controlled by a switch A and idler belts 20, 29, which are mounted on a sub-frame 27 located on the side walls 28 of the top drawer by lugs 26b and wing nuts 26a, whereby the document is driven across a platen comprising a metal frame 21 having an aperture in which a transparent plate 23 may be disposed. Tubular lamps 39, 40 with reflectors 41, 42 and a tubular lamp 43 on a vertically movable carriage 45 controlled through a cord 46 by a hand crank 47 are also mounted on the sub-frame 27 and either or both groups of lamps may be lit, as selected by a multiposition switch B, by closure of a switch 93 by adocument-tripped lever 92, which switch also controls the motor for feeding the film 66 in the camera. The top section 30 of the delivery shoot is removably secured directly to the sides 28 of the drawer 17. A rolled-up document may be placed in a tray 35 hinged to the table 18 and held in operative position by latch pins 35a when the hinged front 36 of the drawer is let down. The copying camera, which is mounted together with the middle section 76 of the shoot in the drawer 58, comprises a drum 62 around which the film 66 is fed from supply spool 59 to take-up spool 60 for exposure beneath a slit 67 to an image of the document reflected from mirrors 70, 71 on a stage 73 movable by a hand-wheel controlled rack and pinion for focusing the objective 68. A diaphragm for controlling the amount of light passing , from the document through a light tunnel 67 to the film is disposed adjacent the document feeding means in the top drawer, and comprises two rigid side walls 50, 51 hinged about horizontal axes at 48a and connected by fabric bellows-form walls 52, the rigid walls being controlled by antinous cables 53, 54 to allow for variations in lamp brilliance and the reflectivity of the documents. The bottom drawer 79 houses the lower end 80 of the delivery shoot and is provided.with a receiving tray 85 which may be extended to the front when the door 81 of the compartment 13 is removed and placed into the recess 16.in the bottom thereof, while a synchronous motor 87 drives a roller 86 between which and a roller 88 stored at 89a the document may be fed to avoid curling in the shoot. The apparatus may be employed to make simultaneously a micro-film record and a contact print of a transparent document 95 by feeding a lightsensitive sheet 96 as of blue-print paper face downwards in contact with the document which is also face downwards. If longer exposure is required for the contact print, the document and light-sensitive sheet may be fed over a transparent platen 97, replacing the belt 29 and beneath which are arranged tubular lamps 99 controlled by a switch C directly into the section 76 of the delivery shoot. Alternatively the light-sensitive sheet may be fed into contact with the document after this has been photographed, in which case the belt is split into two sections on opposite sides of the aperture 22. Specification 617,603 is referred to.