Improvements relating to electrically-operated two

专利名称：Improvements relating to electrically-operated two state devices especially forstoring binary digital data

申请号：US45871054申请日：19540927公开号：US2734837A公开日：19560214

摘要：796,993. Digital-data-storage devices. ELECTRIC & MUSICAL INDUSTRIES, Ltd.Sept. 22, 1954 [Oct. 3, 1953], No. 27178/53. Class 106 (1). [Also in Groups XXXVII andXXXVIII] An electrically-operated two-state device, especially for storing binary digitaldata, comprises a conductive member the magnitude of the current in which determinesthe condition of the device, first and second unilaterally conductive paths connected toone end of said member, a third unilateral conductive path connected to the other end ofsaid member, means biasing the ends of said paths remote from said member in suchmanner that potentials simultaneously applied to the biased ends of two paths arerequired to vary the current in said member in one sense, whereas a potential applied tothe biased end of one path alone can vary the current in the opposite sense, and holdmeans for maintaining the current in said device through one at least of said paths inresponse to a variation of the said current in the increasing sense. Each two-state devicecomprises an electro-mechanical relay having a control winding 1, Fig. 2, and forms a basicstorage unit for one binary digit. Normally each terminal A, B and C is held at a positivepotential and no current flows in the relay coil. In this condition the storage unit is said tobe storing a \" one.\" The storage unit is cleared, i.e. the relay coil made conductive, by

applying a negative clearing pulse to the terminal C, which causes the relay contacts tochange over, and, in particular, causes a contact 5 to close, thus completing a holdingcircuit which retains the relay energized even when the negative clearing pulse ceases.Data is entered into a storage unit by applying simultaneously a negative data pulsetogether with a negative selecting pulse to terminals A and B respectively. Twenty ofthese basic storage units arranged in the form of a 4 X 5 matrix, Fig. 3, provide a store forfour five-digit binary numbers, each of which is applied in parallel form to terminals A0,A1, A2, A3 and A4, and enters the storage units of that row which is selected by anegative pulse applied, simultaneously with the number, to one of terminals B1, B2, B3and B4. Any row can be cleared by applying a negative clearing pulse to one of terminalsC1, C2, C3 and C4. The matrix store is said to be for use in an automatic device forcontrolling machine tools and a circuit is given (Fig. 1, not shown) in which a secondcontact on each relay of each row either switches into, or out of series, secondarywindings on a transformer to produce an analogue voltage whose amplitude representsthe value of the number registered in the corresponding row of the matrix. Specifications731,650, [Group XXXVIII], 796,994, [Group XXXVI], and 796,995, [Group XXXVIII], arereferred to.

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