US2359617A - Magnetic recording apparatus - Google Patents

Magnetic recording apparatus Download PDF

Info

Publication number
US2359617A
US2359617A US421079A US42107941A US2359617A US 2359617 A US2359617 A US 2359617A US 421079 A US421079 A US 421079A US 42107941 A US42107941 A US 42107941A US 2359617 A US2359617 A US 2359617A
Authority
US
United States
Prior art keywords
recording
magnets
magnetic
sheet
contacts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US421079A
Other languages
English (en)
Inventor
James W Bryce
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US421079A priority Critical patent/US2359617A/en
Priority to GB16903/42A priority patent/GB561758A/en
Application granted granted Critical
Publication of US2359617A publication Critical patent/US2359617A/en
Priority to DEI1971A priority patent/DE975355C/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • This invention relates to magnetic recording apparatus, and particularly to such apparatus wherein discrete magnetic impressions or representations are recorded, on a magnetizable sheet, at different 4code or index point positions for representing the data desired. to be recorded.
  • An object of the present invention resides in the provision of an'improved and simplified apparatus for recording discrete magnetic data representations.
  • a keyboard control unit and a recording unit are provided, wherein a plurality of instrumentalities are selectively manipulated, at will, in the keyboard unit, in accordance with the data to be recorded, for controlling differentially settable devices, which devices, in turn, cause individual printing means and magnet selector means to be set at diierent positions for representing the data.
  • Suitable means are provided for rendering the printing means operative to print the data at predetermined line spaces on the magnetizable sheet.
  • Intermittently operable sheet feeding means are provided and called into action to present the sheet to the magnetic recording station upon complettion of the printing operation.
  • a plurality of groups of recording magnets are provided at the recording station which are supported by cyclically operable positionable means for placing the said magnets in a recording or non-recording position.
  • Sheet feeding operations are effected while the magnets are in a non-recording position.
  • the magnetizable sheet In the recording position, the magnetizable sheet is wedged between the magnet pole-pieces and a backing plate member of suitable magnetic material.
  • the magnets are selectively connected in control circuits by the differentially settable magnet selector means, so that individual capacitor means are effective upon their discharge to energize the selected magnets of each related group, and thereby effect recording of discrete magnetic representations at predetermind code positions on the magnetizable sheet.
  • Switching means are provided, which are operated in timed relationship with the printing means, the sheet feeding means, and the ⁇ magnet positioning means, for alternately connecting the individual capacitor means to individua-1 charging and discharging circuits, the latter circuits including the selected recording magnets, so that the selected recording magnets of each group are energized upon the discharge of the related capacitor means.
  • Another object of the present invention resides in the provision of cyclically operable means for placing a group of recording magnets in recording and non-recording positions, the operation of which is under control of the will of the operator.
  • Another object of the present invention resides in the provision of an improved magnetic recording apparatus wherein the magnetizable sheet is wedged between the pole-pieces of a group of magnets and a backing plate member of suitable magnetic material, whenever-the said magnets are placed in a, recording position.
  • Another object of the present invention resides in the provision of an improved magnetic recording apparatus wherein intermittently operable sheet feeding means are provided for advancing the said sheet only at such times when the group of magnets are in a non-recording position.
  • Still another object of the present invention resides in the provision of means operated in timed relationship with the magnet positioning means for effecting the discharging of the said condensers only at the times when the recording magnets are in a recording position.
  • Still another object of the present invention resides in the provision of an improved recording unit wherein a plurality of recording magnets are retained in spaced relationship in a common member of magnetic material.
  • Still another object of the present invention resides in the provision of an improved recording unit wherein a common backing plate member of magnetic material is positioned opposite the group of spaced recording magnets in order to concentrate the flux in separate perpendicular paths in the magnetizable sheet.
  • Still another-object resides in the provision of improved magnetic recording apparatus wherein the data is printed on predetermined line spaces on the sheet at one station, and recorded magnetically at Ipredetermined areas on the sheet at another station, whereby each area containing the magnetic representations bears a xed linear relationship to the related area or line space in which the printed data is formed.
  • Fig. 1 is a perspective View of the keyboard control unit with the attached recording unit.
  • Fig. 2 is an end view, partially in section, of the units shown in Fig. 1, with the cover plates removed.
  • Fig. 3 is a sectional View of the recording unit
  • Fig. 4 is asectional view of the recording unit, taken along the lines 4 4 in Fig. 8.
  • Fig. 5 is a sectional View, taken along the lines 5 5 of Fig. 8.
  • Fig. 6 is a sectional View, taken along the lines 6 6 in Fig. 3.
  • Fig. '1 is a sectional view, taken along the linesV 1 1 in Fig. 8.
  • Fig. 8 is an elevational view, partly in section, of the recording unit.
  • Fig. 9 is a detail view showing the various settings of the conducting arms of the magnetV selector means.
  • Fig. 10 is a detail view of the recording magnets in the recording position.
  • Fig. 11 is a circuit diagram showing the circuit connections of the machine.V
  • Fig. 12 is a timing chart.
  • Fig.Vr 13 is a fragmentary view of the record sheet.
  • Fig. 14 shows the combinational code used herein for representing the data.
  • Fig. 15 ⁇ is a sectional view of the record sheet.
  • keyboard control unit generallydesignated by the refer ⁇ ence character A, willv be described brieily. It will be understood, 'as the description progresses, that the purpose of this unit is merely to provide manipulative instrumentalities, such as keys 20, for eiecting the selection of predetermined control elements in the magnetic recording unit; in
  • keyboard Vcontrol unit which is called into operation at will, is shown for exercising the desired selective control over the said recording unit.
  • this keyboard control unit issimilar to the structure shown and described in U. S. Patent No'. 1,816,263, dated July 28, 1931, thus',.for a complete and detailed description of the mechanism of the presentV keyboard control' unit, reference should be made to this last mentioned-patent.
  • a plurality of similarly constructed banks of keys areprovided, three banks of amount designa- -tion keys, andone bank of' classication designation keys.
  • the keys comprising each bank are slidably mountedV in separate key frames 2l, i
  • a companion segment 29 Pivoted on the crossrshaft or rod 28, adjacent each of' the segmental actuatorsV 26, is a companion segment 29 provided with teeth 3
  • Each indicator segment 29 is also provided with teeth ⁇ 32, which mesh with a related -gear 33.
  • Each ofthe gears 33 provided is secured to one end of a cross shaft 34 or one of the nested sleeves 35 surrounding the said cross shaft 34;
  • Each gear 33 also meshes with a related ⁇ gear 36, which gear 36' meshes with the related pinion 31 secured to a corresponding indicator wheel 38.
  • the mechanism provided in the present keyboar-d control' unit for adjusting the indicator wheels 38 is of the type in which the indicatorsY are always rst brought to zero, and then adjusted to their new positions under control of the provided differential mechanism.
  • Each indicator segment 29 is provided with an abutting face 40, so, as the restraining and. restoring bar 25 is rocked, in a clockwise direction, it contacts the abutting ,faces of such of the indicator segments 29, as may stand in other than their home positions, to restore them and all of the, corresponding indicators 38 to their zero positions.
  • the recording unit generally designated by the reference character B (Figs. 1-3) is arranged as a distinctly separate and detachable unit from the keyboard control unit A. Certain control elements, which will be described later, of the recording unit are adapted to engage the differentially positioned gears 36 and the idler gear 43 of the keyboard control unit A, when the said recording unit B is attached to the said unit A.
  • I'he recording unit B comprises, generally, two sections, namely, the magnetic data recording section, and the data printing section.
  • the selected data represented by the depressed keys 20
  • the magnetic representations or impressions representing the selected data are discrete magnetic impressions formed on the magnetizable record sheet at predetermined code or index point positions. These coded magnetic impressions will be referred to as discrete magnetic index points to distinguish from the well known form of sound tracks represented by the continuous magnetic impressions recorded on suitable magnetizable materials.
  • this data is also printed on the magnetizable record sheet by means of the said printing section. It will be seen that the printed data is disposed so as to bear a xed linear relationship with the magnetic index points representing the data and corresponding to the said printed data. It has been found by experiment that this provision is a necessary one, because in the machines adapted to be controlled by the magnetized sheets or strips formed by the present invention, it is important that certain indicating marks, such as the printed data, be provided, in order to assure that the magnetized sheets are properly positioned, in the machines to be controlled thereby, with respect to a xed reference point in the controlled machine.
  • the printed data become fixed indicating marks, which bear a xed linear relationship to the magnetic data index points, whereby it can be determined whether or not the said magnetized sheets are properly positioned in the machines controlled by such sheets or strips.
  • a controlled machine of this character is described and claimed in Patent 2,302,002, issued November 1'1, 1942.
  • a suitable magnetizable record sheet or strip 50 is shown to comprise a paper carrier or base 5! which is coated with magnetizable granular material 52, and a layer of paper 53 suitable for receiving printed impressions covering the said magnetizable material.
  • suitable metal powder or filings may be suspended or mixed in any suitable binder and sprayed or coated on one of the plies or layers of paper.
  • This binder may contain suitable adhesive material in order to bond securely the magnetizable material to both plies of paper, and
  • a fragmentary section of the continuous record sheet 50 is shown and comprises individual records formed thereon at equally spaced intervals, which are indicated by the reference characters a-c.
  • Each individual record comprises a line of printed data, as indicated by the reference character 54, which printed data correspond to the magnetically recorded data, and a plurality of discrete magnetic index points, indicated by the reference character 55.
  • the magnetic impressions on the record sheet are not visually discernible, but are merely indicated, by the shaded areas l55, to show the code positions of certain of the data representing magnetic impressions.
  • code employed to represent various data is shown in Fig. 14.
  • the code or index point positions for the available columns on the record sheet are shown by the cross marks in the first individual record a on the sheet.
  • the printed data 54 of each record is disposed at a predetermined and fixed location on each record, and that the magnetic index points are disposed in a predetermined and xed area on each record.
  • the linear relationship between the line of printed data -54 and the magnetic index points 55 is a fixed relationship, which arrangement will be described in more detail hereinafter. It should be mentioned too, that the usual marginal or:
  • feed perforations 56 are provided in the instant record sheet 50.
  • Figs. 2 4, and 8 it is seen that the record sheet 50 is fed from a supply roll S0 over the idler rollers 6l, past the printing station generally designated 62, the magnetic recording station generally designated 63, idler roller 64, sprocket feed roller B5 to the take-up roll 66.
  • the record sheet is fed, once each cycle, near the end of each cycle, as indicated in the timing chart (Fig. 12). feeding operation occurs between the printing operation and the magnetic recording operation, the purpose of which will become apparent.
  • the mechanism for effecting the intermittent record sheet feeding operations will now be described.
  • the idler gear 43 which is driven by gear 42 on the cam shaft 24, meshes withra gear 61 secured to the main shaft 68 of the recording unit, and suitably supported therein by the side plates 49.
  • a mutilated driving gear 69 secured to the said main shaft 68 is a mutilated driving gear 69, the teeth 1D of which, engage, during the rotation of shafts 24 and 68, the teeth 1I of the mutilated gear 12, thereby effecting a partial rotation of gear 12, for each revolution of gear B9.
  • the said mutilated gear 12 is secured to the sprocket feed roller B5, which roller 65 in turn is rotatably mounted on a stud shaft 13 suitablysupported by the intermediate plate 14.
  • ] and 1! of gears 69 and 12, respectively, are arranged so that, for each partial rotation or intermittent movement of gear 12 and feed roller 65, the record sheet 55 is advanced a predetermined distance D, as indicated in Fig. 13.
  • An expedient friction drive for the take-up roll 66 is provided, and comprises a gear 15 also secured to gear 12 which meshes with an idler gear 16 rotatably supported by the arm 11 which gear 16 in turn meshes with gear 18 rotatably mounted on a. stud shaft 19 carried by the said The combinational arm 11.
  • a rol1er 80 Secured to gear 18 is a rol1er 80 provided with suitable friction 'rolls 8
  • the arm 11 ispivotally supported by the stud shaft 13 and by means of spring 82 is urged in a counterclockwise direction (as Viewed in Fig, 4) so that the driven friction rolls 8
  • Magnetic recording means -Referringnow to Figs. 3, 4, 8 and'lO, the means for electingthe magnetic recording of the selected data on VVthe magnetizable sheet 50 at the generally designated magnetic recording station 63 will now be Y described.
  • a plurality of vertically arranged columns or rows of apertures 88 are provided, each column or row having, in the instant case, four equally spaced apertures.
  • the individual magnets 85retained by a column or row of four apertures will be referred to as a group of recording magnets.
  • each magnet of a group is spaced vertically so as to correspond to the vertically spaced index point positions of a column indicated in Fig. 13, and the individual groups of magnets of each column are spaced horizontally to correspond to the individual columns of index point positions indicated in Fig. 13.
  • the retaining block 81 is mounted on a member 8S constructed of suitable electrical insulating material, which member in turn is secured to one arm of a bell crank lever 90.
  • the said lever 90 isV rotatably mounted on a sleeve 9
  • the othery arm of bell, crank lever ⁇ 90r is pivotally connected to one end of a cam follower arm 93, the other end of which is bifurcated to partially surround the shaft 68'.
  • a cam roller 9!! is suitably disposed on the said follower arm 93, which cam roller 94 rides on the periphery of the cam element 95, the latter being secured to shaft 68.
  • the cam element 95 upon rotation of the shaft 68, the cam element 95, near the end of each cycle of rotation of shaft 68, causes the cam follower arm 93 to be raised to its uppermost position and thereby cause the retaining block 81 and the groups of magnets, supported by the bell crank lever 90, to be partially rotated in a clockwise direction. Due to this operation, the magnets are positioned in what will be termed hereinafter as the recording position, i. e., the magnets are positioned, as shown in Fig. 10, so thatthe pole-pieces 86 of the magnets 85 contact the magnetizable record sheet 50 at the index point positions of the individual records as indicated in Fig.'13.
  • the magnetizable record sheet 50 rests against a backingplate or block 96V of suitable magnetic material, such as soft iron, which is supported by one of the side plates 49 and the intermediate plate 14.
  • the said backing plate member 96 israrranged to extend beyond the area, both verticallyl and horizontally, to be recorded on the said magnetizable record sheet.
  • means'tobe described later herein are effective to select certainA magnets of each group and connect these se lected magnets to circuit energizing means to energize the selected magnets, and thus cause discrete magnetic impressions to be recordedin the code or index point positions; ⁇ on the magnetizable sheet in accordance with the selected data set up on the keys of the keyboard control unit. It has been determined, by experiment, that, by using a backing plate of highly permeable material having low retentivity characteristics, on the side of the highly retentive record sheet opposite the magnet pole-pieces, greater concentration of the magnetic eld or flux,- in a path perpendicular to the surface of the record sheet is obtained.
  • the thickness of the backing plate is substantially the same as the lengthof the entire pole-piece of each magnet.
  • Each of the said individual means ⁇ comprises an arcuaterbank of fixed contacts
  • is provided with a common elongated contact member
  • 02 is provided for each column of data to be recorded on the magnetizable sheet, or stated in other Words, a bank of the said contacts is provided for each vertically arranged group of magnets 85.
  • the individual segmental members carrying the said contacts are held in a suitably spaced relationship by the individual spacing blocks
  • Each set in the instant case, consists of six radial conducting arms
  • Fig. 9 In Fig. 9,
  • 06 is fixed to an individual arcuate insulating strip
  • 08a.-d With reference now to Fig. 6, the individual annular members
  • 085; is secured to a sleeve
  • 5 is secured to the shaft 68 for cooperating with the cam follower arm
  • I6 is bifurcated at one end and partially surrounds shaft 68, the other end of said arm being pivotally connected to an extension arm II'I of a bell crank lever I
  • 8 is provided with a camming surface
  • 23 is pivotally mounted on cross rod 92 and at its upper extremity is provided with a transverse bail or hammer
  • the said bail and bar extend transversely across the faces of the-type segments II5, so that the positioned type elements
  • 5 near the end of each cycle of rotationv of shaft 68 (namely, the 265 point in the cycle, see Fig. 12), causes the cam follower arm II6 to be raised to its uppermost position, causing the print hammer arrangement to be in the maximum cocked position.
  • the cam follower arm II6 is constantly urged in a downwardly direction, as viewed in Fig. 4, by the spring
  • a ribbon feed actuating mechanism is provided, and briefly comprises a pivoted lever
  • 33 ride on the peripheries of complementary cam elements
  • 29 operates the pivoted link
  • the magnetizable sheet is fed one time each machine cycle, i. e. for each complete rotation of shaft cated by the reference characters a to c.
  • the sheet 50 is advanced, by the feed mechanism described herein, a fixed distance, indicated by the reference character D in Fig. 13.
  • the next line space for receiving the printed data is presented to the said printing station, which printed data is recorded during the cycle following the just mentioned sheet feeding operation.
  • the predetermined area in which the magnetic index points are recorded is a fixed distance from the corresponding line of printed data. 'I'his area is presented to the magnetic recording station Ihe magnets 85 are held in the recording posi- Y tion from the 335 cycle point to the 345 cycle "l point. Individual switching means are provided for controlling the energization of the recording magnets at approximately the 340 'cycle point,
  • a plurality of individual switching vmea'nsfiare provided, such Vas camr ⁇ operated contacts'lato l'dd and IMa. to fldl'd, the former being a group of normally closed contacts, and the latter-a group of normally ⁇ opened contacts.
  • the contact assembly generallydesignated by 4the reference character
  • said cam element 43 Yis provided with la single notch or depression
  • the group-of normally closed contacts Iot-d are opened momentarily and the groupof normally opencontacts Ulla/d are ⁇ closed momentarily.
  • the magnet coils are connected in groups of fours in the individual condensers ISM, ⁇
  • 453 is connected directlyto the individual condensers
  • These individual charging circuits are maintained throughout the machine cycle until approximately the 340 cycle point, at'which time the described charging circuits are disconnected from the said rectier unit, by virtue of the opening of contacts
  • the magnets of each group are selectively connected to the individualand related discharging circuits by means of said magnet yselector means. The selection of the magnets 85 of each group depends upon the settings of the annular members
  • 5066 to d are connected to the individual discharging circuits, which circuits include certain selected magnets 85 of each group, to effect energization of the selected magnets due tothe discharging of the related condensers.
  • the said gears 36 Vin turn cause the typesegments
  • the shaft 6B of the recording unit is also set into operation to elect the following sequential and timed operations (l) operation of the ribbon feed mechanism, (2) cooking or setting of the print-hammer arrangement during the to 265 ⁇ cycle points, (3) printing of the setup data (01.12B) on-the record sheet 50 at the 265' cycle point, by releasing the-said vmagnets85 into recording positionduring the 250 to 335 cyclepoints, andV maintaining the saidvmagnets in recording position during the 335 to 345 cycle points, and (6) rendering the individual switching means operable approximately atV the 340 cycle point, under control ⁇ of the common control means, such-as cam 9MB', which is operated in timed relationship with-the above-mentioned elements to open the setsvof contacts
  • a to d are opened and contacts
  • the positioned groups of magnets 85 are also returned to their non-recording positions during the 345 to 360 cycle points, so that during the following cycle of operation, the desired data can be printed on the proper line space, and the record sheet then be advanced to the magnetic recording station as described.
  • a magnetic recording apparatus for recording coded discrete magnetic representations on a magnetizable sheet comprising a plurality of recording magnets, a common retaining block of magnetic material provided with a plurality of spaced apertures for receiving the said recording magnets, means for supporting the said block and magnets on one side of the magnetizable sheet, a common backing plate member of magnetic material, and means for supporting the backing plate member on the other side of the said sheet opposite the said recording magnets.
  • a backing member of magnetic material of high permeability and low retentivity a supporting member adjacent thereto,- a group of recording magnets mounted on said supporting vmember and having protruding pole pieces facing said backing member, one of said members being movable outward from the other member, to provide a gap between said pole pieces and said backing member to receive the magnetizable sheet material; means to move said movable member torward the other member tQ squeeze the magnetizable sheet material between said pole pieces and said backing member, and means to energize said recording magnets.
  • a backing member of magnetic material of high permeability and low retentivity In an apparatus for recording discrete magnetic code spots on a magnetizable sheet material, a backing member of magnetic material of high permeability and low retentivity, a supporting member adjacent thereto, a group of recording magnets mounted on said supporting member and having protruding pole pieces facing said backing member, one of said members being movable outward from the other member, to provide a gap between said pole pieces and said backing member to receive the magnetizable sheet material, means to feed the magnetizable sheet material intermittently through Said gap, means to move said movable member toward the other member to squeeze the magnetizable sheet material between said pole pieces and said backing member, means to energize said recording magnets; and means to operate said feeding means, said moving means, and said energizing means in timed relation, so that said recording means is energized while said magnetizable sheet material is squeezed between said pole pieces and said backing member and during intermissions in the operation of said feeding means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Time Recorders, Dirve Recorders, Access Control (AREA)
  • Labeling Devices (AREA)
  • Handling Of Sheets (AREA)
  • Credit Cards Or The Like (AREA)
US421079A 1941-11-29 1941-11-29 Magnetic recording apparatus Expired - Lifetime US2359617A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US421079A US2359617A (en) 1941-11-29 1941-11-29 Magnetic recording apparatus
GB16903/42A GB561758A (en) 1941-11-29 1942-11-27 Improvements in or relating to magnetic recording apparatus
DEI1971A DE975355C (de) 1941-11-29 1950-09-20 Anordnung zum Aufbringen von magnetischen Schluesselsymbolen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US421079A US2359617A (en) 1941-11-29 1941-11-29 Magnetic recording apparatus

Publications (1)

Publication Number Publication Date
US2359617A true US2359617A (en) 1944-10-03

Family

ID=23669084

Family Applications (1)

Application Number Title Priority Date Filing Date
US421079A Expired - Lifetime US2359617A (en) 1941-11-29 1941-11-29 Magnetic recording apparatus

Country Status (3)

Country Link
US (1) US2359617A (de)
DE (1) DE975355C (de)
GB (1) GB561758A (de)

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499895A (en) * 1945-10-08 1950-03-07 Joseph B Walker Magnetic recording apparatus
US2560474A (en) * 1947-06-18 1951-07-10 Teletype Corp Keyboard operated magnetic recorder
US2561476A (en) * 1947-09-29 1951-07-24 Bell Telephone Labor Inc Magnetic recorder
US2611813A (en) * 1948-05-26 1952-09-23 Technitrol Engineering Company Magnetic data storage system
US2672395A (en) * 1952-09-18 1954-03-16 Bell Telephone Labor Inc Recording system
US2680155A (en) * 1949-10-26 1954-06-01 Automatic Elect Lab Telephone system using magnetic recorder
US2696420A (en) * 1950-12-14 1954-12-07 Ibm Bipolar magnetic recorder
US2706118A (en) * 1947-07-03 1955-04-12 Armour Res Found Magnetic recorder
US2743988A (en) * 1950-03-18 1956-05-01 Ncr Co Duplicating apparatus for making magnetic records
US2751433A (en) * 1952-07-28 1956-06-19 Rca Corp Character analyzing systems
US2771505A (en) * 1953-07-21 1956-11-20 Marchant Res Inc Readout devices
US2781508A (en) * 1952-05-01 1957-02-12 Eustace E Suckling Intelligence transmission system
US2784392A (en) * 1952-02-07 1957-03-05 Bull Sa Machines Data recording system
US2791310A (en) * 1952-06-28 1957-05-07 Rca Corp Character printing and encoding apparatus
US2836147A (en) * 1954-10-27 1958-05-27 Gen Electric Recording and portraying apparatus
US2847919A (en) * 1953-03-13 1958-08-19 Mergenthaler Linotype Gmbh Photocomposing machine
US2887936A (en) * 1953-10-20 1959-05-26 Louis A Spievak Type composing apparatus
US2902213A (en) * 1953-09-28 1959-09-01 Ibm Accounting machine
DE1076416B (de) * 1955-05-04 1960-02-25 Ibm Deutschland Vorrichtung zur Ausloesung eines elektrisch gesteuerten Paralleldruckwerks
US2931571A (en) * 1951-04-11 1960-04-05 Ncr Co Magnetic storage of multiple totals
US2939758A (en) * 1953-11-20 1960-06-07 Sperry Rand Corp Magnetic data recording apparatus
US2962339A (en) * 1955-01-28 1960-11-29 Raytheon Co Apparatus for concentrating flux in magnetic printing
US3015087A (en) * 1955-07-26 1961-12-26 Security Systems Inc Security system
US3042901A (en) * 1948-10-01 1962-07-03 Dirks Gerhard Distributor-controlled magnetic storage unit
US3075194A (en) * 1959-08-20 1963-01-22 Ibm Unit document originating machine
US3119110A (en) * 1949-05-02 1964-01-21 Sperry Rand Corp Data storage apparatus controls
US3146455A (en) * 1959-06-30 1964-08-25 Ibm Magnetic data transferring device
US3149901A (en) * 1960-11-17 1964-09-22 Bell Telephone Labor Inc Recorder
US3156919A (en) * 1960-12-30 1964-11-10 Ibm Electromagnetic transducer head
US3161544A (en) * 1960-06-14 1964-12-15 Gen Electric Recording and portraying apparatus
US3245039A (en) * 1954-03-22 1966-04-05 Ibm Electronic data processing machine
US3471862A (en) * 1967-10-18 1969-10-07 Walter W Barney Encoder apparatus for magnetic credit cards and the like

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE267273C (de) *
DE251111C (de) *
DE213024C (de) *
DE638179C (de) * 1930-12-25 1936-11-11 Siemens & Halske Akt Ges Telegraphenempfangsapparat fuer wahlweises oder gleichzeitiges Drucken und Lochen, bei dem die an den Waehlschienen angebrachten Ansatz- oder Zwischenstuecke je nach der Zeichenkombination in den Weg des Stanzhammers gebracht werden
DE572162C (de) * 1931-09-04 1933-03-11 Accounting And Tabulating Mach Kartenlochmaschine mit Druckwerk
FR838421A (fr) * 1937-05-27 1939-03-06 Ibm Moyens et méthode de calcul
NL77676C (de) * 1937-05-27

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499895A (en) * 1945-10-08 1950-03-07 Joseph B Walker Magnetic recording apparatus
US2560474A (en) * 1947-06-18 1951-07-10 Teletype Corp Keyboard operated magnetic recorder
US2706118A (en) * 1947-07-03 1955-04-12 Armour Res Found Magnetic recorder
US2561476A (en) * 1947-09-29 1951-07-24 Bell Telephone Labor Inc Magnetic recorder
US2611813A (en) * 1948-05-26 1952-09-23 Technitrol Engineering Company Magnetic data storage system
US3042901A (en) * 1948-10-01 1962-07-03 Dirks Gerhard Distributor-controlled magnetic storage unit
US3119110A (en) * 1949-05-02 1964-01-21 Sperry Rand Corp Data storage apparatus controls
US2680155A (en) * 1949-10-26 1954-06-01 Automatic Elect Lab Telephone system using magnetic recorder
US2743988A (en) * 1950-03-18 1956-05-01 Ncr Co Duplicating apparatus for making magnetic records
US2696420A (en) * 1950-12-14 1954-12-07 Ibm Bipolar magnetic recorder
US2931571A (en) * 1951-04-11 1960-04-05 Ncr Co Magnetic storage of multiple totals
US2784392A (en) * 1952-02-07 1957-03-05 Bull Sa Machines Data recording system
US2781508A (en) * 1952-05-01 1957-02-12 Eustace E Suckling Intelligence transmission system
US2791310A (en) * 1952-06-28 1957-05-07 Rca Corp Character printing and encoding apparatus
US2751433A (en) * 1952-07-28 1956-06-19 Rca Corp Character analyzing systems
US2672395A (en) * 1952-09-18 1954-03-16 Bell Telephone Labor Inc Recording system
US2847919A (en) * 1953-03-13 1958-08-19 Mergenthaler Linotype Gmbh Photocomposing machine
US2771505A (en) * 1953-07-21 1956-11-20 Marchant Res Inc Readout devices
US2902213A (en) * 1953-09-28 1959-09-01 Ibm Accounting machine
US2887936A (en) * 1953-10-20 1959-05-26 Louis A Spievak Type composing apparatus
US2939758A (en) * 1953-11-20 1960-06-07 Sperry Rand Corp Magnetic data recording apparatus
US3245039A (en) * 1954-03-22 1966-04-05 Ibm Electronic data processing machine
US2836147A (en) * 1954-10-27 1958-05-27 Gen Electric Recording and portraying apparatus
US2962339A (en) * 1955-01-28 1960-11-29 Raytheon Co Apparatus for concentrating flux in magnetic printing
DE1076416B (de) * 1955-05-04 1960-02-25 Ibm Deutschland Vorrichtung zur Ausloesung eines elektrisch gesteuerten Paralleldruckwerks
US3015087A (en) * 1955-07-26 1961-12-26 Security Systems Inc Security system
US3146455A (en) * 1959-06-30 1964-08-25 Ibm Magnetic data transferring device
US3075194A (en) * 1959-08-20 1963-01-22 Ibm Unit document originating machine
US3161544A (en) * 1960-06-14 1964-12-15 Gen Electric Recording and portraying apparatus
US3149901A (en) * 1960-11-17 1964-09-22 Bell Telephone Labor Inc Recorder
US3156919A (en) * 1960-12-30 1964-11-10 Ibm Electromagnetic transducer head
US3471862A (en) * 1967-10-18 1969-10-07 Walter W Barney Encoder apparatus for magnetic credit cards and the like

Also Published As

Publication number Publication date
DE975355C (de) 1961-11-09
GB561758A (en) 1944-06-02

Similar Documents

Publication Publication Date Title
US2359617A (en) Magnetic recording apparatus
US2254931A (en) Control record for accounting machines
US2811102A (en) Random printing means
US3001469A (en) Data registering apparatus
US2254933A (en) Record controlled machine
US2333463A (en) Apparatus for recording statistical records
US3892174A (en) Electrically controlled apparatus for marking objects
US3182591A (en) Image forming apparatus and method
US2362004A (en) Analyzing device
US3064259A (en) Electrostatic recording of information
GB561757A (en) Improvements in or relating to record-controlled perforating machines
US2771505A (en) Readout devices
US3585928A (en) Printing plate making machine
US3068481A (en) Process and apparatus for tesiprinting
US3886563A (en) Electrostatic printer with movable style
US3176307A (en) Method of and apparatus for electrostatic recording
US2743988A (en) Duplicating apparatus for making magnetic records
US2357456A (en) Sheet feeding device
US2918610A (en) Magnetic chuck
US2891469A (en) Consecutive number recording apparatus
US1082774A (en) Printing-machine.
US2833475A (en) Magnetic record and recordcontrolled mechanism
US2976103A (en) Character printing graphical recorder
US2132410A (en) Selective printing machine
GB718116A (en) Improvements in or relating to record strip positioning devices in tabulating and like machines