Patent GB-785005-A (GB)
Title: Improvements in and relating to photographic copying and viewing apparatus
IPC: G03B27/50
Filed: 1955-12-16
Abstract: 785,005. Photographic copying and projection apparatus. BELL & HOWELL CO. Dec. 16, 1955 [Jan. 26, 1955], No. 36163/55. Classes 97(1) and 98(1) A combined copying and viewing apparatus comprises a camera for photographing documents on to a film and an independent projector for projecting images of records from a second film on to a viewing screen, the camera and projector sharing a common objective lens and reflector which are mounted together to be movable between two positions, one in which they co-operate with the camera and the other in which they co-operate with the projector. Provision is made for recording any projected image on a separate sensitive sheet. Fig. 4 shows the front of the apparatus, partly in section. The documents are fed in the top of the right hand side between rollers 75, 76 (see also Fig. 6, which is a section along line 6-6 of Fig. 4) and both sides are copied on to the film 49 of the camera unit 7. The projector unit 9 projects images of records on film 45 on to the viewing screen 19. The common optical unit (Fig. 9, which is a section on line 9-9 of Fig. 4) comprises a mirror 220 and an objective lens 221 mounted on a turret 223 which is rotatable by the shaft 229 and a knob 51. In the position shown the optical unit cooperates with the camera unit 7, but on rotating the knob 51 through 180 degrees the unit takes up the position shown in dotted lines when it co-operates with the projection unit 9. A motor 122 (Fig. 7) runs continuously and drives two pairs of feed rollers 75, 76 and 88, 89 and may also drive the feed and take up spools 46, 47 of the camera through a clutch which is disengaged when documents are not being fed. Documents to be copied are fed into the opening 29 (Fig. 6) in the top right hand side of the apparatus, and engage feelers 112 which rotate the bar 113 (see also Fig. 4). This closes a microswitch (not shown) which operates the clutch to drive the camera spools 46, 47 and to energize the lamps 24 which illuminate both sides of the document in the space between the pairs of rollers. An image of both sides of the document appearing in the space between the pairs of rollers is reflected by mirrors 99, 100, which are inclined at 90 degrees to each other, on to a mirror 101, part of which is shown in Fig. 9, and thence to the mirror 220, and into the camera unit 7. As soon as the document has passed feelers 112 the microswitch opens to open the clutch and switch off the lamps 24. The record strip in the projector is wound between feed and take-up spools 41, 43 by means of the handle 71. The lighting unit comprises lamp 239 (Fig. 9) reflector 242 and condenser 243 and reflects light into the film gate 213 by means of reflector 245. In the position of the optical unit shown in dotted lines in Fig. 9, an image of the record film formed by lens 221 is reflected by mirror 220, towards the rear of the apparatus, and thence by. mirror 224 (Fig. 7) on to the viewing screen 19. If it is desired to photograph any image appearing on screen 19, a mirror 248 is lowered about its pivot 249 into the position shown .in dotted lines, and a sheet of sensitive material is placed on an easel 70.