Patent GB-705629-A (GB)
Title: Improvements in or relating to photographically copying documents
IPC: G03B27/46
Filed: 1952-03-10
Abstract: 705,629. Copying documents photographically; shutters. KODAK, Ltd. March 10, 1952 [March 10, 1951], No. 6222/52. Class 98(1) A method of photographically recording on a length of film images of the obverse and reverse sides of each of a series of documents, comprises the steps of arranging the documents in a stack, transferring the documents one at a time to another stack and, during the transfer, turning the document over so that the reverse side of one document is presented for photographing at the same time as the obverse side of the next document, and photographing the different pairs of sides on successive areas of the film which abut along one edge and one displaced longitudinally by a distance substantially equal to one half the length of each area so that the images of the two sides of a document are disposed adjacent to one another in the width of the film. As shown a stack 45 of documents with their obverse sides uppermost is arranged adjacent an abutment 18 in the base of a photographic copying apparatus. This apparatus comprises a camera 20 having staggered objectives 29, 30 and a shutter disc 31 with pairs of apertures 32, 33 and 32<SP>1</SP>, 33<SP>1</SP> adapted to register with the respective objective axes. Shutter 31 has projections 52, 53 and 52<SP>1</SP>, 53' for co-operation with the armature of which is energized by actuation of buttons 50, a solenoid 51, and is operatively connected with the film driving motor. The camera also includes a film gate, Fig. 5 (not shown) consisting of a fixed member having an aperture with a stepped edge and a slidable member with an aperture having a stepped edge. This slidable member is connected to a movable abutment 41 against which a stack 46 of documents with their reverse sides uppermost rests during operation of the method, the position of abutment 41 defining the size of the exposure aperture. With the document stack 45 in position adjacent the abutment 18, buttons 50 are simultaneously operated so that shutter 31 is released and aperture 32 moves over objective 29 and a latent image 0<SP>1</SP> of the top document is formed on the film. The shutter is arrested by stop 53 before an exposure is effected through objective 30 and aperture 33. The top document is then inverted and placed against the abutment 41. Buttons 50 are again actuated so that the reverse side R<SP>1</SP> of the transparent document and the obverse side O<SP>2</SP> of the top document of stack 45 are photographed through aperture 33 and objective 30 on the other side of the film centre line, the image of the reverse side R<SP>1</SP> of the transferred document being by the side of the image of the obverse side O<SP>1</SP> of that document. Before shutter 31 is arrested by the stop 52<SP>1</SP> the film is advanced, and the top document on stack 45 is inverted and placed on top of the document which was transferred first. The cycle of operations is then repeated. Instead of two objectives 29, 30, a single objective may be used, this objective being so mounted that it can take.up the same positions as the objectives 29, 30 for the alternate exposures. The film may be moved manually through the camera. Specifications 526,296 and 528,952 are referred to.