Patent GB-369635-A (GB)
Title: Improvements in or relating to machines for verifying perforated records
IPC: G06K5/00
Filed: 1930-12-23
Abstract: 369,635. Statistical apparatus. BRITISH TABULATING MACHINE CO., Ltd., Victoria House, Vernon Place, London. -(Assignees of Tabulating Machine Co. ; 270, Broadway, New York, U.S.A.) Dec. 23, 1930, No. 38683. Convention date, Dec. 24, 1929. [Class 106 (i).] Verifying perforated records.-Verifying apparatus of the step-by-step type (i.e. verified a column at a time) having warning means to indicate errors, comprises a controlling electromagnet 44 (for controlling the warning means), record-controlled contacts 13 for energizing (or de-energizing) the magnet 44 and manual contacts 35 for cancelling the effect of contacts 13. If the card is correct in the column read, a magnet 16 is energized so that escapement mechanism allows the card to step-on to the next column. If the card is wrong the warning consists in the card carriage failing to escape. The record card 10 is placed between pusher 11 and a guide 12 so that the first column is at the reading-balls 13 which coact with a roller 14. Parts 11 and 12 are attached to a rack 15 which is moved one step to the left by spring 25 and tape 26 when the magnet 16 is energized. The latter attracts its armature bell crank 22, 21 so that a link 20 rocks lever 19 counterclockwise and raises the pawl 17, pivoted on 19, from the rack 15. At the same time pawl 18 descends to hold the rack against overdriving since a spring causes a pin 24 on pawl 18 to follow the lever 19. Arm 21 also opens contacts 39 and closes contacts 40, Figs. 1 and 3. 28, 29, 30, Fig. 2, are skip, tabulating, and release keys. Twelve verifying keys 27 may be depressed against spring-pulled bell cranks 32 having pin and slot connections with twelve slides 33. When any slide 33 is thus moved to the left it rocks a common bar 36 to open contacts 37 and close contacts 38. It also closes and opens its individual contacts 34, 35 respectively, Figs. 1 and 3. Rack 15 carries a contact blade 41 which connects with a common strip 42 and fixed insulated inserts 43. These make connections for verifying code cards. Circuit diagram. When a card hole is read a circuit 52, 54, 14, 13, 35, 56, 44, 57, 58, 53 is closed at the appropriate contact 13 to energize magnet 44. This opens contacts 441 and then closes 44<11> to energize relay 45. The latter provides a holding circuit for itself at 45<11>, and closes contacts 45<1>. If the key 27 corresponding to contact 13 just in use is depressed, contacts 35 are opened, magnet 44 is deenergized and contact 441 re-close. 441 and 45<1> are now both closed and energize magnet 16 to feed the card one column over a circuit 52, 59, 63, 44<1>, 45<1>, 49<1>, 64, 16, 65, 58, 53. Armature 22 is attracted and opens contacts 39 to de-energize relay 45 and open contacts 451, 45<11>. If the key 27 used does not correspond to the contacts 13 closed, then magnet 44 remains energized and 44 remain open. If there be no hole in the column, 44 is not energized and contacts 45<1> remain open. In either case, magnet 16 is not energized and the card carriage fails to escape. The skip key 28 is depressed for a column which should be blank ; if the column is blank, contacts 44<1>. remain closed (since 44 is not energized) and 28 complete a circuit for the magnet 16. If the column contains a hole, contacts 44<1> are opened and magnet 16 is not energized. The circuits are such that if a key 27 is depressed without the escape magnet 16 being energized then contacts 49', (controlled by magnets 49, 46, 47 and contacts 66) are opened and remain open until the error key 69 is depressed. Tabulator key. To skip a number of blank columns, key.29 is depressed to close contacts 291 and to project a bar 76. The latter, Figs- 1 and 7, raises the pawl 17 from the rack 15 sothat the latter escapes until the bar 76 falls into the next notch 79a in a bar 79 rigid with rack 15. These notches 79a are. positioned according to which fields of the card are to be skipped. If there is a hole in the field being skipped the contacts 13, 35 and 29<1> form a circuit to energize magnet 51 ; this closes contacts 51<1> and energizes magnets 46 and 49 to open contacts 49<1> and prevent escape of the card carriage. Release key. When the blank field to be skipped is at the extreme right-hand end of the card, the release key 30 is depressed. This actuates a cam slide to raise bar 76, Fig. 7, and release pawl 17, the bar being held raised until the carriage has escaped to its extreme position. The key also closes contacts 30<1> which function similarly to contacts 29<1> above. Code cards. To verify Peirce cards, the magnets 50 with their contacts 50<1>, 50<11>, 50<111> come into action. For two holes in a column, two keys 27 are depressed to close two contacts 34 and energize two magnets 50. If the verification is wrong a circuit extends through the contacts 41, 43, the series 50, 50<11>, 50<111> and 19<111> to energize magnet 44, but if verification is correct the circuit through the series of contacts 50<1>, 50<11>, 50<111> is interrupted and the magnet 44 is de-energized so that magnet 16 is energized. If the card, correctly, has only one hole in a column then key 92 is depressed to get de-energization of magnet 44.