Patent GB-588167-A (GB)
Title: Improvements in or relating to record card punching machines
IPC: G06K1/04
Filed: 1945-02-01
Abstract: 588,167. Statistical apparatus. BRITISH TABULATING MACHINE CO., Ltd. (International Business Machines Corporation). Feb. 1, 1945, No. 2596. [Class 106 (i)] A card punching machine comprises a master card sensing means, a detail card sensing means, a supplementary master card sensing means for sensing data to be punched on a detail card, means for comparing classification data on a master card with that on a detail card and punching means operable in the case of equality and controlled by the supplementary sensing means to punch on the detail card data sensed on the master card. Where the classification data on the detail card is lower or higher than that on the master card, the feeding mechanism operates to feed on the lower card and bring forward a further card to the sensing means. A master card from a magazine M (Fig. 5) and a detail card from a magazine D are fed past sensing brushes 15 and 17 respectively and their classification numbers are compared by a network (Fig. 6b ... d) which controls the operation of clutches R1, R2, P (Fig. 5) coupling the feeding rollers to the main driving mechanism. Thus, if the numbers agree, clutch R2 is engaged to feed the master card past sensing brushes 16 which control the operation of known punching mechanism 18 which reproduces data on the detail card. If a second detail card with the same classification number follows, the punches are then controlled from-the sensing brushes 19 reading the data in the first detail card. Meanwhile, the first master card has been passed into the master card hopper, but the second master card remains stationary between rollers 65, 66, until an equal or a higher detail card causes clutches Rl, R2 to be engaged. In the first case, the master card controls the punching of the detail card, as before ; in the case of a higher detail card, the master card and succeeding ones, if any, are fed through to the hopper until " equality " or " high master card " is detected by the comparing mechanism. In the latter case, the detail cards are fed through without punching. Comparing mechanism. The readings of the master card sensing brushes 15 (Fig. 6d) and detail card brushes 17 are translated to a fourposition code (Fig. 6c) and set up in relays (along the bottom of Figs. 6c and 6d). The code consists in expressing all numbers in terms of 1, 2, 4 and 6, and, to this end, cam-controlled contacts CR10, CR11, CR12, CR13 close only at certain index point positions as indicated in the table. Thus, the sensing of a hole 'in a master or detail card energizes one of the relays M1, M2, &c. (Fig. 6d) or D1, D2, &c. (Fig. 6c) which closes its related contacts 1, 2, 3 and 4, whereupon, according to the cam contacts CR10, 11, &c. which are closed at this index point, holding circuits are established for the appropriate M or D relays R1, R2, R4 and R6. These relays control contacts in a network (Fig. 6b) through which an impulse from line 207 is passed at an appropriate time in each cycle. If the numbers set up in the M and D relays, respectively, are equal, a circuit is completed to line 221, and a relay is energized which controls the machine in the manner described above. A lower detail card number completes a circuit to a line 239 to energize a different controlling relay, while a higher detail card number energizes a relay on the line 233. The card feeding mechanism is of the usual type, the two sections of the master card feed being controlled by one-revolution clutches R1, R2 (Fig. 5), each operated upon energization of an electromagnet in known manner. The detail card feed is similarly controlled by clutch P, the step-by-step feeding past the punches being obtained by a Geneva mechanism (Fig. 4). A roller 107 on a gear 26 enters one of the slots in a Geneva gear-wheel 109, whereupon the wheel is moved with a gradually accelerated and gradually retarded motion until the roller moves out of the slot and the Geneva wheel is then held for more than half a revolution of the gear-wheel 26 by the engagement of a radial' extension 112 with the concave portion 111 on the Geneva wheel.