Patent GB-665992-A (GB)
Title: Improvements in or relating to photographic document copying apparatus
IPC: G03B27/50
Filed: 1948-05-27
Abstract: 665,992. Photographic copying apparatus. KODAK, Ltd. May 27, 1948 [May 27, 1947], No. 14314/48. Class 98 (i). In apparatus through which a document to be copied is moved continuously alternative cameras are provided having objectives suitable for recording, respectively, on the full width of the sensitive material, either an image of one side of the document or a side-by-side pair of images of both sides. The sensitive material is moved through the camera in use at the same speed as the image. The positioning of one or other camera on the apparatus may effect the necessary speed change in a driving mechanism for the sensitive material or may control the illumination of one or both sides of the document as required. In the form shown the document is fed between rollers 3, 4 driven by an electric motor 5 and passes between two plates each provided with a slot parallel to the roller axes where it is illuminated by lamps 13 or, if both sides are to be photographed, by lamps 14 also. Light from the document is reflected by mirrors 15, 16 and a further mirror 17 to a camera 11 with two objectives 9 and duplicate film-feeding rollers 24. Duplicate records are taken on the two films. If both sides of the document are being photographed the lenses are symmetrically placed so that the two sides are recorded side by side. If only one side is being photographed a camera is used with lenses offset and of a focal length to produce images thereof filling the width of each film. The camera in use is being located by dowels and secured by a spring catch. The film drive is derived from the motor 5 through a chain 53 and pairs of pulleys 54, 59 and 55, 61 which may be brought into use alternatively by engaging the serrated clutch member 57 with either of the members 58, 60 secured to the pulleys 59, 61. This may be effected by axial movement of the shaft 56 and of the shaft 49 to which it is connected by a magnetic clutch 130. A clutch member connecting this shaft to the camera does not slide with it, but the movement is followed by a lever with arms 69, 102 carrying a pin 71 which can enter a hole provided in one only of the alternative cameras. The film speed appropriate to each camera is thus selected. Identification numbers &c. carried on a member 75 and lighted by lamps 134 are photographed simultaneously with the documents, an optical compensator 81, consisting of a rotating mirror assembly being used to project on to the film, through the objectives, an image moving at the same speed as the film, the light beam being also reflected in turn from mirrors 85, 86, 87. The optical compensator is driven from the shaft 49 by a chain 89 through a gear change arrangement actuated by the lever 69, 102 which keeps the compensator speed constant. Insertion of a document actuates fingers controlling switches to start the machine by energizing the magnetic clutch 130 and lighting the lamps 13 and, if required 14. The lamps are fed through variable resistances, that for the lamps 13 being changed when photographing only one side of the document, by a switch actuated by a projection carried only on 'the appropriate camera. In a modification the shaft 56 does not move axially but the clutch member 57 can slide along it for alternative engagement with its driving members. This movement is transmitted to the lever 69 by a separate rod.