US1811817A - Duplication of sound records obtained by magnetic means - Google Patents

Duplication of sound records obtained by magnetic means Download PDF

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Publication number
US1811817A
US1811817A US354686A US35468629A US1811817A US 1811817 A US1811817 A US 1811817A US 354686 A US354686 A US 354686A US 35468629 A US35468629 A US 35468629A US 1811817 A US1811817 A US 1811817A
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US
United States
Prior art keywords
duplicating
duplication
wires
sound records
magnetic means
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Expired - Lifetime
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US354686A
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English (en)
Inventor
Stille Curt
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TELEGRAPHIE PATENT SYNDIKAT
Telegraphie-Patent-Syndikat G M B H
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TELEGRAPHIE PATENT SYNDIKAT
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/86—Re-recording, i.e. transcribing information from one magnetisable record carrier on to one or more similar or dissimilar record carriers

Definitions

  • Patented 23, 1931 it C'UBT STILLE, OI BERLIN, Gm, KSSIGNOR '20 TEIEGBAPHIE-I ATENT-S YNDKA enamel-r ERLIN, GERMANY DUPLICATION 01 SOUND RECORDS OBTAINED BY MAGNETIC MEANS Application filed April 12, 1829, Serial Ho.
  • the essence of the invention consists 1n this that the steel'carrier on which the soundhas been magnetically recorded is directly or ina directly so adapted as an exciting reproducing magnet that, at the same time it produces a magnetic induction in a series of parallel reproducing steel carriers which are passed along it.
  • This arrangement has substantial advantages as compared with the obvious solution that a series of single reproducing talking heads be used next to one another for each duplicating wire; firstly, because the constructionis simplified and more compact,
  • Figure 1 is a showing of the duplicating system and Figure 2 a detail of the reproducing head used.
  • the recording wire 2 excites the pick-up magnet 4, which in its turn excites the electromagnet 6 of the talking head over an amplifier 5.
  • the core of the latter magnet is constructed in the form of a comb'with closelyadjacent teeth (see Figure 2).
  • an upper comb 7 may additionssesae, and in German -octane: 20, ms.
  • the individual duplicating wires 8 are passed parallel through the guiding eyes 9, 10 and through the free spaces left between the teeth of the upper comb 7.
  • the wires coming from the storing reels converge towards the guiding eyes 9 and'from I the guiding eyes 10 they diverge towards the winding-on reels 11.
  • the latter reels are mounted on the same shaft 12 as the winding-on reel of the record wire, which shaft is driven by the motor at the required speed. In this way, the uniform drawing of the record wire and of all the duplicating wires through the duplicating apparatus is en-' sure d.
  • An apparatus for the simultaneous repeated duplication of steel carriers in the form of bands or wires on which acoustic vibrations are magnetically recorded comprising in combination with a. magnetic master record a duplicating talking head and means inserted between the said master magnetic record and the duplicating talking head for influencing the latter in accordance wih the magnetic record of the acoustic vibrations on the master record, the said talking head having a wide magnet over which the steel carriers to be duplicated are caused to pass parallel and close to one another.
  • An apparatus as claimed in claim 1 characterized by the feature that parallel guiding of the duplicating wires through the duplicating talking head 1s effected by means of guiding passages in front and behind the talking head magnet, which guiding passages consist of holes or grooves uniformly arranged at close distances from one another and from which the duplicating wires diverge towards the winding-off and windingon reels.

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  • Recording Or Reproducing By Magnetic Means (AREA)
US354686A 1928-10-20 1929-04-12 Duplication of sound records obtained by magnetic means Expired - Lifetime US1811817A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE331008X 1928-10-20

Publications (1)

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US1811817A true US1811817A (en) 1931-06-23

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ID=6194103

Family Applications (1)

Application Number Title Priority Date Filing Date
US354686A Expired - Lifetime US1811817A (en) 1928-10-20 1929-04-12 Duplication of sound records obtained by magnetic means

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US (1) US1811817A (xx)
GB (1) GB331008A (xx)
NL (1) NL26040C (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2503925A (en) * 1946-03-14 1950-04-11 Armour Res Found Magnetic recorder for producing multiple duplicate records
US2528279A (en) * 1945-10-19 1950-10-31 Armour Res Found Multiple recorder
US2604549A (en) * 1947-01-04 1952-07-22 Brush Dev Co Device for duplicating magnetic recordings by re-recording processes
US2672346A (en) * 1946-12-21 1954-03-16 Int Electronics Co Office dictation and intercommunication system
US2686057A (en) * 1947-07-30 1954-08-10 William L Woolf Recorder for simultaneous multiple recording upon films, tapes, or wires
DE1114644B (de) * 1958-10-15 1961-10-05 Leslie Farrer Brown Verfahren und Einrichtung zur Herstellung einer magnetischen Aufzeichnung
US3005057A (en) * 1957-05-15 1961-10-17 Charles R Locklin Multiple duplicating tape recorder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698359A (en) * 1947-04-03 1954-12-28 Int Electronics Co Method and apparatus for making magnetic tape records

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2528279A (en) * 1945-10-19 1950-10-31 Armour Res Found Multiple recorder
US2503925A (en) * 1946-03-14 1950-04-11 Armour Res Found Magnetic recorder for producing multiple duplicate records
US2672346A (en) * 1946-12-21 1954-03-16 Int Electronics Co Office dictation and intercommunication system
US2604549A (en) * 1947-01-04 1952-07-22 Brush Dev Co Device for duplicating magnetic recordings by re-recording processes
US2686057A (en) * 1947-07-30 1954-08-10 William L Woolf Recorder for simultaneous multiple recording upon films, tapes, or wires
US3005057A (en) * 1957-05-15 1961-10-17 Charles R Locklin Multiple duplicating tape recorder
DE1114644B (de) * 1958-10-15 1961-10-05 Leslie Farrer Brown Verfahren und Einrichtung zur Herstellung einer magnetischen Aufzeichnung

Also Published As

Publication number Publication date
NL26040C (xx)
GB331008A (en) 1930-06-26

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