US3782656A - Driving device for oppositely rotating tone shafts of a sound recording device - Google Patents

Driving device for oppositely rotating tone shafts of a sound recording device Download PDF

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Publication number
US3782656A
US3782656A US00264837A US3782656DA US3782656A US 3782656 A US3782656 A US 3782656A US 00264837 A US00264837 A US 00264837A US 3782656D A US3782656D A US 3782656DA US 3782656 A US3782656 A US 3782656A
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US
United States
Prior art keywords
belt
tone
shaft
tone shaft
belt pulley
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
US00264837A
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English (en)
Inventor
W Broghammer
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.)
DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GmbH
Original Assignee
Dual Gebruder Steidinger GmbH and Co
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
Priority claimed from DE19712130751 external-priority patent/DE2130751C3/de
Application filed by Dual Gebruder Steidinger GmbH and Co filed Critical Dual Gebruder Steidinger GmbH and Co
Application granted granted Critical
Publication of US3782656A publication Critical patent/US3782656A/en
Assigned to DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GMBH reassignment DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DUAL GEBRUDER STEIDINGER GMBH U. CO. 1.K,
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
    • G11B15/26—Driving record carriers by members acting directly or indirectly thereon
    • G11B15/32—Driving record carriers by members acting directly or indirectly thereon through the reels or cores on to which the record carrier is wound

Definitions

  • ABSTRACT A driving device for the tone shafts of a sound recording device which comprises a motor, a first tone shaft, and a flywheel-mass disposed coaxially to the first tone shaft and operatively connected therewith.
  • a first belt pulley is disposed coaxially to the first tone shaft and likewise operatively connected therewith,
  • a second tone shaft has an axis substantially parallel to the axis of the first tone shaft.
  • a second belt pulley is disposed coaxially to the second tone shaft and operatively connected therewith, as well as having its periphery close to the periphery of the first belt pulley.
  • An elastic belt driving the first belt pulley and the second belt pulley by means of the motor in opposite di' rections, and the elastic belt has such height, that the portion of the belt disposed between both belt pulleys is not pressed togetherby the belt pulleys, yet runs freely for such short path, that the longitudinal elastic ity being so small, not to exert a disturbing influence on the uniformity of the rotary speed of the second tone shaft during the operatively occurring load fluc' tuations of the second tone shaft.
  • the present invention relates to a driving device for two oppositely rotating tone shafts of a sound recording device, in general, and to such tone shafts which are driven by a motor :via a single belt and selectively by application of a sound recording tape serve as a speeddetermining drive means for the recording tape.
  • Devices of this type are used, when the recording tape is supposed to vary fast its direction of movement during the working action, i.e., with avoidance of a speed reversal of flywheel masses.
  • two tone shafts are driven with a flying wheel each in opposite directions.
  • the drive of a fly wheel mass by means of an elastic belt represents generally a very low-frequency-oscillation formation, with the advantage, that non-uniformities of the motor rotations are not transformed to the fly-wheel-mass speed.
  • the synchronismstability of the individual flywheel-masses would also increase, more exact investigations have disclosed, that the opposite is the case.
  • two tone shafts In order to arrange two tone shafts at a relatively small axial distance, i.e., at a distance, which is smaller than the radius of the fly-wheel-masses, one must neglect one of the flywheel-masses.
  • the two tone shafts are coupled together with two correspondingly smaller friction wheels, whereby the tone shaft is driven by the motor via a belt.
  • FIG. 1 is a top plan view, shown schematically, of a tone shaft driving device
  • FIG. 2 is a side elevation of the device disclosed in FIG. 1;
  • FIG. 3 is a fragmentary top plan view, shown at an enlarged scale, of the belt arrangement shown at A in FIG. 1.
  • two belt pulleys 3 and 4 which each sit on a tone shaft 5 and 6, respectively, are driven by means of a continuous belt 2.
  • One of the tone shafts carries a flywheel-mass 7.
  • the belt 2 runs free only over a very short path between the two belt pulleys 3 and 4. How short the freely running belt piece B is to be chosen, depends upon different factors, by example, upon the belt cross-section and the elasticity module of the used material, but also upon the tolerance, i.e., in the direction towards the tone shaft.
  • the elasticity of the belt piece B is supposed to be low in longitudinal direction, so that the coupling of the flywheel-massless tone shaft 6 with that flywheel-mass 7 is stiff as much as possible, in order to permit the stabilizing effect of the flywheel-mass 7 fully as much as possible also on the coupled tone shaft 6.
  • the belt pulleys 3 and 4 cannot sit so tight to each other, that with the conventional tolerances, in particular in the belt thickness leads to a more or less strong pressing together of the belt therebetween and thus to changing energy losses by fulling and to different bearing pressures.
  • a freely running belt piece of a length B which corresponds about the thickness of the belt, has been found satisfactory.
  • a driving device for the tone shafts of a sound recording device comprising a motor
  • flywheel-mass disposed coaxially to said first tone shaft and operatively connected therewith
  • a second tone shaft having an axis substantially parallel to the axis of said first tone shaft
  • a second belt pulley disposed coaxially to said second tone shaft and operatively connected therewith, having its periphery close to the periphery of said first belt pulley,
  • said elastic belt having such height, that the portion of said belt disposed between both said belt pulleys runs freely for such short path, that the longitudinal elasticity being so small, as not to exert a disturbing influence on the uniformity of the rotary speed of said second tone shaft during the operatively occurring load fluctuations of said second tone shaft.

Landscapes

  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Pulleys (AREA)
US00264837A 1971-06-22 1972-06-21 Driving device for oppositely rotating tone shafts of a sound recording device Expired - Lifetime US3782656A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712130751 DE2130751C3 (de) 1971-06-22 Antriebseinrichtung für gegenläufig umlaufende Tonwellen eines Tonbandgeräts

Publications (1)

Publication Number Publication Date
US3782656A true US3782656A (en) 1974-01-01

Family

ID=5811369

Family Applications (1)

Application Number Title Priority Date Filing Date
US00264837A Expired - Lifetime US3782656A (en) 1971-06-22 1972-06-21 Driving device for oppositely rotating tone shafts of a sound recording device

Country Status (4)

Country Link
US (1) US3782656A (en:Method)
ES (1) ES403884A1 (en:Method)
FR (1) FR2143307B1 (en:Method)
GB (1) GB1379890A (en:Method)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5752893A (en) * 1994-12-14 1998-05-19 Lg Electronics, Inc. Driving force transmitting apparatus for headphone stereo mechanism
US5855332A (en) * 1996-11-21 1999-01-05 Zebco Corporation Rotatable line spool for a fishing reel
US10160480B2 (en) * 2015-07-28 2018-12-25 Sterling Solutions Ip Holding Corporation Pulley assembly having idler, power assist system having pulley assembly, and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3286943A (en) * 1962-06-04 1966-11-22 Matsushita Electric Ind Co Ltd Automatic reciprocating magnetic tape recording and reproducing apparatus
US3610553A (en) * 1968-09-07 1971-10-05 Sony Corp Recording and/or reproducing apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3286943A (en) * 1962-06-04 1966-11-22 Matsushita Electric Ind Co Ltd Automatic reciprocating magnetic tape recording and reproducing apparatus
US3610553A (en) * 1968-09-07 1971-10-05 Sony Corp Recording and/or reproducing apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5752893A (en) * 1994-12-14 1998-05-19 Lg Electronics, Inc. Driving force transmitting apparatus for headphone stereo mechanism
US5855332A (en) * 1996-11-21 1999-01-05 Zebco Corporation Rotatable line spool for a fishing reel
US10160480B2 (en) * 2015-07-28 2018-12-25 Sterling Solutions Ip Holding Corporation Pulley assembly having idler, power assist system having pulley assembly, and method

Also Published As

Publication number Publication date
DE2130751A1 (de) 1972-12-28
FR2143307A1 (en:Method) 1973-02-02
FR2143307B1 (en:Method) 1973-07-13
GB1379890A (en) 1975-01-08
DE2130751B2 (de) 1974-07-04
ES403884A1 (es) 1975-05-01

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Legal Events

Date Code Title Description
AS Assignment

Owner name: DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GMBH, 7

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DUAL GEBRUDER STEIDINGER GMBH U. CO. 1.K,;REEL/FRAME:004356/0863

Effective date: 19841212