Patent GB-709556-A (GB)
Title: Improvements in and relating to apparatus for identifying a predetermined pattern oflight apertures in a series of patterns
Inventor: BRISCH EDWARD GUSTAV
Filed: 1950-04-20
Abstract: 709,556. Statistical apparatus. COSSOR,: Ltd., A. C. and BRISCHE, E G. April 20, 1951 [April 20, 1950]. No. 9781/50. Class 106 (1). [Also in Group XL(b)] Detail punched cards are sorted by comparison with a master card punched with the required combination of holes so that a flash of light may pass through the master and detail cards: A matching condition is detected by a photo cell and associated circuit responsive to the maximum light obtainable from the flash when one hole in each column is matched, and all the light passing through the master card also passes through the detail card. Any mismatch results in some diminution of the total intensity of the light falling on the photocell and the associated circuit responds accordingly. Cards 44 are fed from a stack by a belt 47 provided with raised strips 48 to engage and accommodate the cards in succession. The cards are fed past a master card 25 and a light source 36, condenser 37, lens 38 and photo-cell 39. A magnetic sorting blade 57 deflects the cards normally to rollers 59, and when energized and raised the cards are deflected downwards in the direction of the belt travel. When the master and detail cards are in register as shown in Fig. 2 light from a lamp 31 passes through a condenser 32 and through control holes 24, 24<SP>1</SP> in the master and detail cards respectively and is focused by a lens. 33 on a photo-cell 34. The output of the photo-cell 34 is fed to a suitable electronic circuit of known form 35 whereby the light source 36 is caused to emit a flash of light. The light source may be a gas discharge lamp such as is used in stroboscopes. Light from the 'lamp 31 also passes through a second pair of control holes 23, 23<SP>1</SP>, in the master and detail cards and is focused by a lens 40 onto a third photo-cell 41, the output of which is fed into a known electronic circuit 42. Light from the flashing source 36 passes through a condenser 37 and the data holes in the master and detail cards and is focused by a lens 38 on to the firsf photocell 39, the output of which is also connected to the electronic circuit 42. The electronic circuit shown diagrammatically at 42 is adapted to generate an output voltage dependent upon the ratio of voltages applied thereto from the two photocells 39, 41. The ratio of 5:1 is the maximum which can be obtained and indicates that in each of the five columns shown, light is passing through matched holes in the master and detail cards. This condition is detected by the circuit which responds by energizing the sorting blade magnet 55, Fig. 3. Any other ratio indicates that one or more of the holes in one or more columns are blocked by a mismatch and the card is accordingly rejected by failure of the electronic circuit 42 to energize the magnet 55. In an alternative arrangement shown in Fig. 7 punched card information is stored on a continuous film 63 which is fed past the master card 25 and a matching condition detected as described above is employed to stop the film when the wanted frame actuates the photo-cell 39. The circuit is arranged to arrest the film in the optical projection system indicated by light source 64, lens 65 and screen 66. A further modification is shown in Fig. 8 where the punched card information is stored on a film as before. In this case a matching condition of the wanted frame with the master card 25 causes the frame to be rephotographed on a second unexposed film 70. The output of the photo-cell 39 and electronic circuit 42 being coupled via a delay device 71 of known form to a magnet 72 operating a photographic shutter 69 and exposing the wanted frame when this has travelled the appropriate distance from the'sensing position to bring it into register with the light source 36 and associated lens system and unexposed film 70. A further delay device 73 provides an impulse at the correct time to a clutch magnet 76 in order to advance the film 70 one frame between successive exposures.