Patent GB-614016-A (GB)
Title: Improvements in or relating to record-card collating machines
IPC: G06F7/02
Filed: 1946-06-28
Abstract: 614,016. Statistical apparatus. BRITISH TABULATING MACHINE CO., Ltd. June 28, 1946, No. 19420. Convention date, June 30, 1945. [Class 106 (i)] A record card collating machine for collating cards having in each column intrazone index positions which represent numbers (1 to 9), and zone index positions (R, X, O) which, in combination with the intrazone index positions, represent other characters (letters or the alphabet &c.), one at least of the zone index positions being a dual zone index position in representing a character when alone in a column, is characterised by means to sense a pair of record cards, storage relays operated under control of the sensing means according to marked zone and intrazone index positions on the pair of cards, a network of relay contacts controlled by the storage relays and adapted to close one ot two circuits according to whether the sensed index positions on one card of the pair represents a character which is greater than or less than that represented by the sensed index positions on the other card, according to a predetermined scale of values and excepting the condition when a dual zone index position is on both cards, but is in combination with an intrazone position on only one card of the pair, a second network of relay contacts adapted, when the excepted condition occurs, to close the circuit of a correction relay of which the contacts are adapted, when the correction relay is energized, to alter the circuit closed by the first network. The invention is applied to a collating machine of the type described in Specifications 523,652, 523,709 and 523,710, the general arrangement of which is shown in Fig. 1. Cards from a hopper PH are fed in the usual way past a first set of sensing brushes QB termed the " sequence station," and then past a second set of brushes PB termed the " primary station." This enables a comparison to be made between control data on any " primary " card and similar data on the following " primary " card. The reading at the " primary station is also compared with the reading from a secondary " card, fed from a hopper SH, at the " secondary station " sensing brushes SB. As a result of these comparisons, one or the other of the clutch magnets (not shown) controlling the drives of the primary and secondary feeding means respectively, are energized, and further magnets PRM, SRM1, &c. control deflecting blades 306, 307, 308 to direct the cards into appropriate pockets 1, 2, 3, 4. According to the present invention, the control data on the cards may be numerical, alphabetical, or a mixture of both (e.g. " EX38D3-13 "), the code being shown in Fig. 4. The (ascending) order of magnitude adopted is as follows: Blank column, the - symbol (R perforation), letters A to Z, numbers 0 to 9. The three card sensing stations SB, PB, QB are shown diagrammatically in Fig. 3a, the plugboards being indicated at points SJ, PJ, QJ, SJJ, &c. The sensing of perforations at e.g. the secondary station causes the setting up of relays IS ... XRS of a " secondary group " through the medium of a valve VS. Contacts 741a ... XRa are respectively closed at prearranged times in the machine cycle by relays 741 ... XR, Fig. 3c. Relay 741 is energized at the " 7," " 4 " and " 1 " times in the cycle, and similarly with the other relays, under the control of cam-operated contacts CR21 ... 26, the closing of a contact raising the potential on the grid G1 of an associated valve sufficiently to allow anode current to flow and energize the relay. Where a hole is sensed in a card, current flows, e.g. from a reading brush SB, Fig. 3a, to a valve VS, and anode current then flows to the pick-up coils P of one or more of the relays IS ... XRS whose circuits have been closed by the relays 741 ... XR, Fig. 3c. Holding circuits are established by the coils H of relays IS ... XRS, &c., and also contacts are transferred in a comparing network, Fig. 3e, so that when a circuit is completed, subsequently, through this network, one of three wires P" lo," S" lo," and E" out " is energized according to whether the control data on the primary card is lower, higher, or equal to that on the secondary card. A similar comparing network, Fig. 3d, is used between the primary and sequence stations, but the relays HEQ and HEP take the place of relays 1S . . . 6S and 1P ... 6P in the network. Three thyratrons V91, V92, V93, Fig. 3a, are operated from the sensing brushes PB, QB in such a manner that, when the readings are equal, both V92 and V93 fire, causing energization of relays HEP and HEQ, but if V92 fires earlier, the relay HEQ opens contacts HEQb preventing subsequent firing of V93, or if V93 fires earlier, contacts HEPb are transferred causing V91 to be fired subsequently instead of V92. Supplementing the other relays, correction means are required to provide for the cases where a blank occurs in one compared column and an O or a dash symbol, or any alphabetic character whose designation includes an O hole, appears in the other compared column; also where an O occurs in one compared column and any alphabetic character whose designation includes an O appears in the compared column. These means comprise relays SBR and PBR, Fig. 3e, in the case of the primary and secondary comparing circuit, and relays PQZ and QBZ in the case of the primary sequence circuit, Fig. 3d. Three chains of contacts LQb, HEQb . . . , 1Pb, 2Pb . . . , 1Sb, 2Sb . . . control the energization of the relays SBR, PBR, PQZ, QBZ. According to the results from the comparing circuits, a relay PL, PES or SL, Fig. 3e, and a relay QH, QE or QL, Fig. 3d, are energized and control the delivery of cards to appropriate pockets in accordance with the plugboard arrangements for the results desired. In a modification, the valves V58, Fig. 3c, are replaced by thyratrons (Fig. 3g, not shown) which obviate the need for the relays 741 . . . XR and their holding circuits, the relays 1S . . . XRS, &c., being simply included in the anode circuits of the thyratrons.