US2671619A - Winding mechanism for magnetic recorders - Google Patents

Winding mechanism for magnetic recorders Download PDF

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Publication number
US2671619A
US2671619A US314501A US31450152A US2671619A US 2671619 A US2671619 A US 2671619A US 314501 A US314501 A US 314501A US 31450152 A US31450152 A US 31450152A US 2671619 A US2671619 A US 2671619A
Authority
US
United States
Prior art keywords
tape
winding
cylinder
magnetizable
motor
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
US314501A
Other languages
English (en)
Inventor
Fernand De Clerck
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.)
Umicore NV SA
Original Assignee
Acec
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 Acec filed Critical Acec
Application granted granted Critical
Publication of US2671619A publication Critical patent/US2671619A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/43—Control or regulation of mechanical tension of record carrier, e.g. tape tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B1/00—Film strip handling
    • G03B1/42—Guiding, framing, or constraining film in desired position relative to lens system
    • G03B1/54—Tensioning or loop-maintaining devices
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/26—Driving record carriers by members acting directly or indirectly thereon
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/26—Driving record carriers by members acting directly or indirectly thereon
    • G11B15/34—Driving record carriers by members acting directly or indirectly thereon through non-slip drive means, e.g. sprocket
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/60—Guiding record carrier
    • G11B15/66—Threading; Loading; Automatic self-loading
    • 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
    • G11B5/004—Recording on, or reproducing or erasing from, magnetic drums

Definitions

  • Copending application Ser. No. 215,215, filed March 13, 1951, now abandoned, describes a mechanism of this character, the purpose of which is to assure correct operation and perfect magnetic reproduction at any point whatsoever of the tape. More particularly, the mechanism of the said copending application is designed toward the achievement of correct winding of the magnetizable tape onto a winding cylinder or drumsuch winding involving a translational movement of the tape along a path fixed in space-without transverse sliding movement toward either 'of'its edges, and also toward the achievement of a uniform winding without abnormal increase due to enlargement of the diameter of th assembly formed by the winding cylinder and the part of the magnetizable tape already wound thereon.
  • a sheet of metal or of metallized material is interposed between the last two layers of magnetizable tape and slides between them and such sheet, being retained by spring means.
  • a primary object of the present invention is th embodiment of improved winding mechanism, designed primarily for use in winding and unwinding mechanism of the type of the said copending application, and which is free of the aforesaid inconveniences.
  • the winding mechanism is constituted by a winding drum or cylinder provided with an individual driving motor, and by auxiliary means designed to impart intermittent rotary movement to said cylinder, the starting of the said driving motor being effected progressively;
  • the winding cylinder is actuated by an intermittent rotary movement, the angular velocity of which increases gradually from the stat of rest, the said velocity reaching a value such that the linear winding velocity of the magnetizable tape on the said cylinder is greater than the rate of travel of the said tape;
  • the auxiliary device comprises a resistance with a negative temperature coefficient, inserted in series in the feed circuit of the driving motor of the winding cylinder, so that the angular velocity of the said driving motor increases progressively starting from the state of rest;
  • the auxiliary device comprises a switch inserted in series in the feed circuit of the driving motor of the winding cylinder, the said switch being kept closed by a spring, a feeler system in contact with the magnetizable tape also acting on the switch, in such manner that the latter is kept open by the -action of the feeler system when the mechanical tension of the said magnetizable tap exceeds a certain maximum value;
  • the feeler system is made in such a way that contact with the magnetizable tape takes place only in the median portion of the said magnetizable tape, relatively to its width.
  • Fig. 1 is a diagrammatic showing or the rela tionship of parts of the present invention at one stage in the winding operation;
  • Fig. 2 is a similar showing at a different stage in the winding operation.
  • Fig. 3 is a graphic representation of the variation in rotational speed of the motor drivingthe winding drum or cylinder, as a function of the time- Y
  • the magnetizable tape I -after being .delivered from the unwinding cylinder (notshownl-and after being passed over the exploring tabled, where it is exploredby the magneticheads 4, and between the feed rollersr8tand. 9, is directly wound on the winding drum 5.
  • the winding mech- .anism has the following particularities:
  • the winding :drum .5 is fixedly mounted on shaft '50 driven by a'driving motor-I40 (by conventional means, notshown, e. g. a driving-belt .of the like), in.such a way that the maximum .linear windingvelocity of the magnetizable tape Iron the drum .5 is higher thanthe-speed of travel of the-said tape, this'travel- (oradvance move- -:ment) being eilected. by the roller 8 keyed onto shaft 80' driven; by a driving motor (notshown), with the aid' of superposed rollerv 9.
  • a'driving motor-I40 by conventional means, notshown, e. g. a driving-belt .of the like
  • the driving motor I40 is, fed from a suitable and conventional source-of current I4I.
  • a suitable and conventional source-of current I4I In series ,in thesupplycircuit, there. are vintercalated 1. resistance I42, with negative temperature coefficient, and a switch-l43.
  • the switch-I43 is .kept .normally closed by .a pull spring I44 in- .tegrally connected with theframeworkof the apparatus, and is controlled by a feelersystem, .showndiagrammatically at I45,.in contact with the magnetizable tape I.
  • the feeler system itself may be of :any suitable and per se conventionalconstruction. For .ex-
  • the magnetizable tape I being in thevposition shown in Fig. 1; that is to say in the slack" state, the-feeler device I 45. does not act on-theewitch l-43-and permits-the closing-of this "latter .by the actionof thespring I44, .At-thismomentthe supply circuit ofthedriving motor I40 is closed.
  • the graph shownin Fig.3 shows .the. course of the variation of therateof rotation of thedriving motor I40 in time. It can be.seen-.on..this graph that, although the switch I43 .is closedat time tI the .driving motor I 40 I starts only .at. time t2, because of the retarding -.-action.of.the.resistance I42. Between the times t2- andt3 the. rate of'rotation graduallyincreases, and attime t3 the mechanical tension of the magnetizable tape .I is sufiicient for the feelerdevice I45 toopenthe switch I43.
  • a winding mechanism for winding a magnetic recorder tape or the like onto an intermittently rotatable windingcylinder comprising means for feeding the tape along :a pathto said winding cylinder, :and .means for v.impartingdntermittent rotation to said winding .cylin'der, said I .last-namedmeans comprising a driving motor for said cylinder and. means foroontrolling-the angular velocity of said motor. wherebysuch velocity and the velocityof the drivenwindins cylinder progressively increasetotheir maximum, starting from .the state of rest, the .meansffor controlling the saidangular velocity comprising .a resistance with a negative .temperatutecoefficient. inserted in. series, in the feed. circuit. of said motor whereby, initially,lthe resistancehas a maximum value and,- as-.the resistance'heats .up, the resistance graduallyand progressively .de-
  • a winding mechanism for windinga ma .netic recorder tape or the like .onto an intermittently rotatable .winding. cylinder comprising .means for continuously feeding-the .tape along a path to said winding cylinder whereby, when said winding cylinder .is not rotating, ,tape..-in
  • slack state accumulates inthe path between said .cylinder and feeding .means, andmeans for ,pe-.
  • said tensioning means comprising i an intermittently operated driving motor for :said cylinder,..,the
  • the feeler means opening said switch when said tape has been tensioned by said tensioning means, and means for controlling the angular speed of rotation of said motor whereby said speed progressively increases to its maximum, starting from the state of rest, the means I for controlling the said angular velocity comprising a resistance with a negative temperature coefiicient inserted in series in the feed circuit of said motor whereby, initially, the resistance has a maximum value and, as the resistance heats up, the resistance gradually and progressively decreases.
  • a winding mechanism for winding a magnetic recorder tape or the like onto an intermittently rotatable winding cylinder comprising means for continuously feeding the tape along a path to said winding cylinder whereby, when said winding cylinder is not rotating, tape in slack state accumulates in the path between said cylinder and feeding means, and means for periodically tensioning said tape in its travel from said feeding means to said winding cylinder, said tensioning means comprising an intermittently operated driving motor for said cylinder, the maximum angular speed of rotation of which exceeds the linear speed of travel of said tape along said path, a normally closed switch inserted in series in the feed circuit of said motor, feeler means in contact with said tape at a point in its travel from said feeding means to said winding cylinder, said feeler means opening said switch when said tape has been tensioned by said tensioning means, whereby rotation of said motor and winding cylinder stops and said slack again accumulates, means for returning said switch to closed position when said slack has accumulated and means for controlling the angular
  • FERNAND m CLERCK.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Winding Of Webs (AREA)
US314501A 1950-03-14 1952-10-13 Winding mechanism for magnetic recorders Expired - Lifetime US2671619A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1014635T 1950-03-14
FR61161T 1950-06-12
FR62076T 1951-10-26

Publications (1)

Publication Number Publication Date
US2671619A true US2671619A (en) 1954-03-09

Family

ID=41692893

Family Applications (1)

Application Number Title Priority Date Filing Date
US314501A Expired - Lifetime US2671619A (en) 1950-03-14 1952-10-13 Winding mechanism for magnetic recorders

Country Status (6)

Country Link
US (1) US2671619A (de)
CA (1) CA532629A (de)
CH (1) CH296051A (de)
DE (3) DE909502C (de)
FR (3) FR1014635A (de)
GB (3) GB678358A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3561700A (en) * 1969-05-12 1971-02-09 United Research Lab Tape apparatus including tape speed sensing device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB803252A (en) * 1956-01-06 1958-10-22 Ampex Improvements in and relating to magnetic tape machines
NL95808C (de) * 1957-05-23
DE1195068B (de) * 1958-01-31 1965-06-16 Minnesota Mining & Mfg Antriebseinrichtung fuer Tonbandgeraete
DE1171166B (de) * 1958-11-17 1964-05-27 Fritz Hellige & Co G M B H Fab Vorrichtung zum Registrieren von Messgroessen auf einem vorzugsweise endlich bemessenen, bewegten bandfoermigen Aufzeichnungstraeger
DE1169691B (de) * 1961-03-14 1964-05-06 Licentia Gmbh Vorrichtung zum schrittweisen Weiterspulen des Registrierstreifens von Registriergeraeten od. dgl.
DE19804523C2 (de) * 1998-02-05 2000-03-23 Neuenhauser Maschbau Gmbh Dockenwickler

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2229480A (en) * 1939-01-25 1941-01-21 Rca Corp Record tape control device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2229480A (en) * 1939-01-25 1941-01-21 Rca Corp Record tape control device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3561700A (en) * 1969-05-12 1971-02-09 United Research Lab Tape apparatus including tape speed sensing device

Also Published As

Publication number Publication date
GB678358A (en) 1952-09-03
FR61161E (fr) 1955-03-24
FR1014635A (fr) 1952-08-19
GB699400A (en) 1953-11-04
FR62076E (fr) 1955-06-02
DE919075C (de) 1954-10-11
DE909502C (de) 1954-04-22
DE927237C (de) 1955-05-02
GB678133A (en) 1952-08-27
CH296051A (fr) 1954-01-31
CA532629A (en) 1956-11-06

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