Patent GB-883735-A (GB)
Title: Microfilm duplicating apparatus
Inventor: GOODMAN ROBERT CHARLES
IPC: G03B27/08
Filed: 1959-10-08
Abstract: 883,735. Printing apparatus. GENERAL ANILINE & FILM CORPORATION. Oct. 8, 1959 [Nov. 24, I958], No. 34157/59. Classes 97(1) and 98(2). Contact printing apparatus (Fig. 1) comprises a first rotatable support for a roll 5 of microfilm, a second rotatable support for the take up spool 5, means for taking up the slack in the film, a printing mechanism positioned between the two supports comprising means e.g. rotatable shades 42 for masking the undesired portion of the unwound film on the printing mechanism while leaving a section unmasked on a transparent support 43, a light source 53 which may be air cooled, timecontrolled shutter means 55 beneath the support, means for pressing a photo sensitive card against said film, and a viewer in casing 31 whereby the part of the film required for printing is chosen. When operating the apparatus the film is passed through a projecting device X which comprises a lamp 23, condenser 25 a lens barrel 27, projector lens 28, prism 29 and a focus lock 30. An image of the film is projected from the prism 29 via three mirrors 32, 33, 34 (when in the full line position) on to a viewing screen 35. The supports of mirrors 32, 34 are connected together by a rod 37 which in turn is connected to a lever 36. When this lever is rotated the mirrors 32, 34 are also rotated (see dotted position of 36, 32, 34) so that light may be reflected from mirror 32 to mirror 34 directly. The viewer may be moved transversely of the film by rotating lever 41 which is connected to a base 2 through a gear 38 and rack 39. When the desired part of the film is viewed the device 20 is clamped on to the film and is moved over scale 22 so that the desired part of the film is situated in a corresponding position relative to a scale 81 on the printing mechanism. The shades 42 are then adjusted. A photo sensitive card is then held by a spring 85 (Fig. 8) on platform 84. By moving lever 101 into the position shown on left in Fig. 8 the post 82 and platform 84 are coupled to a belt 93 (which is movable over rollers 89, 92 to slide post 82 along rails 93 and vary the position of the card relative to the operating position). A motor 76 (Fig. 3) is then turned on which rotates a shaft 75, which, through the medium of cam 74, follower 73 and levers (not shown) moves a platen 44 (Fig. 1) and guide member 70 forward over the card and then downwardly to press the card against the film. The shutter 55 is then opened and closed automatically by relay 57 energizing de-energizing solenoid 56 as determined by an exposure time control device 58 to photograph the film. The cam 74 then allows the platen 44 and guide members 70 to return to their inoperative position. The belt 93 and hence the post 82 is moved through a wheel 92 on a shaft 91. The shaft 91 is connected by levers 107, 105 to the cam 104 on the rotating shaft 75. The means for taking up the slack in the film comprises (Fig. 7) adjacent each of posts 3, 4 a lever 16 which is spring urged against the film and which has a rod 15 which turns a switch 19 of a motor 8 on or off according to its position i.e. according to the slackness of the film. The motor is connected by a belt 11 to the shaft 6 on which the film spool is fixed.