Patent GB-436804-A (GB)
Title: Improvements in or relating to punching machines for perforating statistical record-cards
Filed: 1934-04-18
Abstract: 436,804. Electric selective signalling systems. BRITISH TABULATING MACHINE CO., Ltd., Victoria House, Vernon Place, Southampton Row, London. April 18, 1934, Nos. 11702 and 11703. Convention dates, April 20, 1933 and April 13, 1934. [Class 40 (i)] [See also Group VIII] A punching machine for perforating statistical record cards with standard holes in positions corresponding to certain pencil or like marks or small holes in the cards, comprises a row of lightsensitive devices, each associated with a separate holeposition in a column of the cards, and adapted to be affected by the presence of a mark in a hole-position, and a separate operative connection between each device and a corresponding electromagnet so that when the condition of the device is modified by a mark the electromagnet operates to make a corresponding perforation. In the construction shown, twelve punch selecting magnets 10 are provided, one for each holeposition in a column of the record card. Each magnet when energized rocks an arm 11 thereby moving a key 13 downwardly to rock a bell crank lever 14 and actuate a slidably - mounted interposer 15. This movement places the forward end of the interposer between a punch 17 and a pivotally-mounted bar 16. A notch 20 in the interposer co-operates with a bar 21 to rock a member 22 and close contacts 23 whereby an electromagnet 24 is energized causing through linkage 26 the bar 16 to be rocked so that the punch 17 is depressed. The punches may be actuated independently of the magnets 10 by the manual operation of the keys 13. A bar 27 beneath all the interposers is carried by a rod 28 to which is secured an arm 29 for operating escapement mechanism comprising a pawl 30 pivoted to the machine frame, a spring-pressed pawl 32 loosely pivoted on the rod 28, and an escapement rack 35. Rocking of the rod 28 by an interposer lowers the pawl 30 into engagement with a tooth 34 on the rack 35, and raises the pawl 32 from a tooth, the spring 33 moving the pawl 32 slightly to the right in readiness to engage the next tooth when the rod 28 is returned to its original position. When the pawl 30 releases the rack 35 the latter is moved to the left by means of a spring barrel 42 connected to gearing 41 which engages teeth on the underside of the rack. The rack may be manually moved towards the right to a position in which it is adapted to receive a record card 19. The rack has a card guide 44 to which is secured a member 45 of insulating material carrying two pairs 46, 47 of electric contact brushes, each pair being insulated from the other pair. The lower of the brushes 46 traverses a strip of conducting material 48 and the upper traverses a number of insulated contact segments 50. The brushes 47 are adapted similarly to engage a conducting strip 49 and contact segments 51. The spacing of contacts 50, 51 corresponds to the spacing of the columns of the record card. To the right of the punches 17 is a bar 53 beneath which the columns of the record card pass in succession. When the first column of the card is beneath the punches 17, the fifth column is beneath bar 53 and the brushes 46 connect the first segment 50 to the conducting strip 48. The bar 53 is associated with a light-sensitive record-reading arrangement comprising a lamp 54 which projects a beam of light to a column of the record card beneath the bar. The card reflects the light to twelve light-sensitive cells 58. Each cell is coupled with an amplifier 74, the output circuit of which extends through a relay coil 100. When the normal amount of light falls on a cell no substantial current flows in the output circuit, but when the light is withdrawn by reason of a mark or hole occurring in the column of the record card, current flows in the circuit sufficient to energize relay 100, which closes five sets of contacts 100a. Assuming that the fifth column of this record card is beneath the bar 53, a circuit will be complete, as shown in Fig. 7, through line 71, line 76, a pair of contacts 100a, a relay 63, line 77, first segment 50, brushes 46, strip 48, relay 78 and switch 73 to line 72. The relay 63 is thus energized to close its contacts 63a. These contacts, as shown in Fig. 6, remain closed under the action of spring latches 65 until released by means of a restoring bar 66. The bar is actuated to engage the latches by means of a bell-crank lever 67 connected to a vertical rod which is adapted to be depressed by means of the rack 35. The relay 78 is energized simultaneously with the energization of the relay 63 so that contacts 78a are closed to complete a circuit for magnet 24. This operates to rock the bar 16, which acts through an extension 27a to rock the bar 27 and operate the escapement mechanism to move the record card so that the second column comes beneath the bar 53. This column is then noted by the light-sensitive devices whereby a second relay 63 is energized. These operations are repeated until the first column of the card is beneath the punch and the fifth column beneath the bar 53. The brushes 47 are then in a position connecting the first segment 51 with the strip 49. A circuit is thus complete from line 72, strip 49, brushes 47, first segment 51, line 80, closed relay contacts 63a, associated magnet 10, and line 82 to line 71. The magnet is then energized to advance the interposer 15, the latter closing contacts 23 to energize the magnet 24 which forces the selected punch through the record card directly over the mark which caused the closure of the relay contacts 63a. Upon the escapement action of the rack immediately following the punching operation one of the rods 68 will be depressed to unlatch these relay contacts 63a. The record continues to advance step by step until all the columns of relays have successively been noted and those energized have been restored.