Patent GB-733463-A (GB)
Title: Improvements in or relating to photographic apparatus
IPC: G03D9/00
Filed: 1953-08-04
Abstract: 733,463. Photographic apparatus. INTERNATIONAL POLAROID CORPORATION. Aug. 4, 1953 [Aug. 8, 1952], No. 21454/53. Classes 98 (1) and 98 (2). Apparatus of the type wherein a photosensitive sheet is processed, described as for use with photo-sensitive and other sheets as of Specification 684,592, comprises a pair of pressure-applying rotatable rollers adapted to advance successive portions of the sheets in superposed relation and thereby rupture containers carried by one of the sheets and spread processing composition from the containers between the superposed sheets, a cutting member for severing the successive portions of the superposed sheets to form successive sandwiches, and means for receiving and stacking a plurality of the sandwiches. The apparatus is described as for use in conjunction with devices associated with X, infra-red and ultra-violet radiation and particularly for attachment to an aerial camera of conventional design. Normally a positive image is obtained directly by imagetransfer from the photo-sensitive to the other sheet. As shown the apparatus comprises a magazine which may be removably attached to the rear of an aerial camera by frame 20 which defines a (downwardly directed) exposure aperture 22, the focal surface 24 being immediately thereabove. The magazine has a housing 26, front side wall 30 and a corresponding side wall at the back, top wall 60 with closure 62 hinged at 64, removable cover member 66 and stationary cover member 67, all with provision for lighttight closure, and various interconnecting crosspieces. Photo-sensitive sheet 70, which may have a succession of frames of silver halide emulsion, on spool 72 is carried on shaft 74 and is drawn past idler roller 89 to be held for exposure on guide or focal surface 24 by pressure plate 88 which may be vacuum operated, and which is releasable for onward movement of the sheet 70. Image-receiving sheet 110 with spaced processing fluid containers 112 corresponding to the frames of photo-sensitive sheet 70 is carried by spool 114 on shaft 116 and is advanced and superposed with the photosensitive sheet by pressure rollers 126, 128 of which the former is driven. Pressure rollers 126, 128 cause rupture of one of the containers 112 and spreading of the processing fluid between the superposed sheets during movement thereof, and these sheets are projected forward by the rollers to enter processing chamber 190. Cutting means comprising a blade 164 with cutting edge 174 and an anvil 166 with cutting edge 180 then operate to sever the superposed sheets and allow them to lie as a sandwich on platform 194 within processing chamber 190. A succession of such sandwiches may be stacked with the aid of a pair of guides 196 and a further guide 200 to prevent curling. After processing of the photo-sensitive sheet and transfer of the positive image onto the image-receiving sheet one or more of the sandwiches may be removed by use of the closure 62. With the aid of a motor in the apparatus, a direct current power supply and coupling means connected to the shutter mechanism of the camera (Figs. 7-13, not shown), the successive operations may be automatic, thus after manual introduction and registration of sheets 70 and 110 with a frame of the former held in exposure position by pressure plate 88, operation of the shutter for a single exposure may cause, also, release of plate 88, revolution of roller 126 to project the superposed sheets until a pair of brushes 276 contact roller 128 through holes arranged in sheet 110 to stop movement of roller 126, operate the severing mechanism and retain the next frame of sheet 70 in exposure position by pressure plate 88. Heating means 260, 262 and 264 may be included in the apparatus.