Patent GB-1006099-A (GB)
Title: Strip film reading apparatus
IPC: G03B21/11
Filed: 1962-03-29
Abstract: 1,006,099. Educational appliances. EASTMAN KODAK CO. March 29, 1962 [April 3, 1961], No. 12080/62. Heading G5G. [Also in Division G2] A reader of the projection cabinet type shown in Fig. 1 with a screen 13 is adapted for use with envelopes 17 each containing four strips of film F1-F4 (Fig. 3) in channels 37, 39, 41, 43, two of which open at each respective end of the envelope for removal and re-insertion of the strips. Each envelope is provided with a number of holes 21 which slot over projections 19 in the base-plate 61 of the envelope receiving station 15, by which arrangement a selected channel (39 in Fig. 3) may be aligned with a projection aperture 99. The plate 61 slidably accommodates both a rigid transparent platen 65 (Fig. 7) and a slide 71. Hingedly connected to the slide 71 by means of two arms 69 is a flexible transparent platen 67. An envelope is located on the plate 61 with the platen 67 in a raised position as at p 1  or p 2 . This platen is then lowered so that a pin 91 thereon engages through an opening 53 of the chosen strip and into a corresponding hole in the platen 65. A key 95 forming a part of the upper arm 69 also engages in a keyway in the platen 65. The platens 65 and 67 are thereby coupled for sliding movement together with film strip located therebetween. A knob 83 attached to the lower arm 69 is provided for moving the strip and platens past the projection aperture, and index means 85, 25 facilitate positioning of any desired image frame in position for viewing. A resilient frame 113 with rollers 115 is provided for pressing the strip against the platen 65 in the region of theprojeetion aperture. Illumination is provided by a lamp 101 with reflector 103 and condensers 105. A projection lens 107 is provided in a mount 109. The apparatus is described for use as a selfteaching device. In this application, each image frame would contain a question part and an answer part. In order to obscure the answer part initially, a slidable shutter member 125 is provided which may be moved out of its answer obscuring position against loading of a spring 135 by activation of an electromagnet 127, the armature of which is coupled to said shutter member by a bell-crank lever 129. A ratchet device (Fig. 8), provided to limit the movement of the strip to one frame at a time, comprises ratchet teeth 134 in a member 131 secured to the underside of the slide 71 and a spring-urged pawl 133 which may be moved out of engagement with the teeth by actuation of an electromagnet 135. The electromagnets 127 and 135 may be connected in a control circuit (Fig. 10-not shown) such that the shutter member 125 cannot be moved for displaying the answer and the filmstrip cannot be advanced to the next frame until an " answer " switch (163, Fig. 10) has been operated. A micro-switch 143 operated by a cam 148 (Fig. 9) integral with the ratchet member 131 control energization of the electromagnets so that the shutter member 125 automatically obscures the answer and the pawl 133 automatically locks the slide 71 against further movement as the film strip is advanced for projection of each image frame in turn.