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    Tabulating machine
    97.
    发明授权
    Tabulating machine 失效

    公开(公告)号：US2156969A

    公开(公告)日：1939-05-02

    申请号：US69509133

    申请日：1933-10-25

    Applicant: IBM

    Inventor： BRYCE JAMES W

    CPC classification number: G06F1/1615

    Abstract: 446,179. Motors. BRITISH TABULATING MACHINE CO., Ltd., Victoria House, Vernon Place, Southampton Row, London. Oct. 24, '1934, No. 30540. Convention date, Oct. 25, 1933. [Class 35] [See also Group XIX] Synchronous electric motors each having an unwound rotor which constitutes a denominational registering element, are combined to form a counter of the kind into which the digits of an amount can be entered simultaneously and are operated by a continuously operable source of current pulses. The operating impulses for a motor may be generated by an electric commutator, and selected for transmission to magnets controlling selected relays by a plurality of key controlled contacts connected between the commutator and the magnets, or alternatively the operating impulses may be generated and selectively transmitted to the relays by perforations in a record which is fed past brushes connected to magnets controlling the relays. Each of the operating impulses corresponds to a digit to be entered, and the interval between it and a fixed moment in the cycle is such that the number of pulses emitted from the currentsource during the interval is proportional to, for example is twice, the value of the digit. The counters comprise a plurality of denominational units, each unit comprising a synchronous electric motor mounted upon a separate supporting plate 75, Fig. 3, supporting pairs of electromagnets 76 and 77, each pair constituting with the plate 75 a horse-shoe magnet having two pairs of poles 78. The polepieces 78 are arranged circumferentially about a shaft 79, Fig. 6, secured to which is a toothed rotor 80 with ten teeth 81. The arrangement is such that when two diametrically opposed pairs of teeth 81 register with two pairs of poles of one pair of magnets, the two pairs of poles of the other pair of magnets will register with the gaps between pairs of the teeth. If the pairs of magnets 76 and 77 are energized alternately by current pulses, the rotor 80 will rotate in synchronism with the current pulses at a rate proportional to the frequency of the pulses, to an extent proportional to the number of pulses transmitted. The number of current pulses is twice the digit to be entered. A device for preventing retrograde movement of the rotor 80 comprises three spring-controlled balls 84, Figs. 5 and 9, disposed between a groove in the shaft 79 and cam surfaces 85 in a bearing block 83. The magnets 77 are normally energized by a direct current and tend to hold the rotor 80 in the position shown in Fig. 6.

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