US3696775A - Magnetic tape recorder particularly of the tape cassette type - Google Patents

Magnetic tape recorder particularly of the tape cassette type Download PDF

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Publication number
US3696775A
US3696775A US83817A US3696775DA US3696775A US 3696775 A US3696775 A US 3696775A US 83817 A US83817 A US 83817A US 3696775D A US3696775D A US 3696775DA US 3696775 A US3696775 A US 3696775A
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US
United States
Prior art keywords
clutch
tape
magnetic tape
clutch disk
tape recorder
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
US83817A
Other languages
English (en)
Inventor
Ernst Markart
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.)
SUD ATLAS WERKE GmbH
Original Assignee
SUD ATLAS WERKE GmbH
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 SUD ATLAS WERKE GmbH filed Critical SUD ATLAS WERKE GmbH
Application granted granted Critical
Publication of US3696775A publication Critical patent/US3696775A/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
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/50—Controlling, regulating, or indicating speed by mechanical linkage, e.g. clutch
    • 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
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/16—Control of operating function, e.g. switching from recording to reproducing by sensing presence, absence or position of record carrier or container
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/20—Auxiliary indicators or alarms

Definitions

  • a magnetic tape recorder particularly of the tape cas- 2 App] N 83, 17 sette type, has support spindles for the tape carrier reels, and these support spindles are provided with driving pulleys which are coupled to a rotary driving [30] Forelgn Apphcatlon Pnomy Data element, during forward and reverse movement of the April 21, 1970 Germany"; ..P 20 19 050.5 tape, y intermediate driving gear eeimeeted with the driving pulleys.
  • a torque responsive clutch is included 52 US. Cl.
  • the driving and driven members are interconnected by a spring wire having one end con- 56] Reerences Cited formingly fitted in a slot in one member and the other end extending into an annular recess in the other UNITED STATES PATENTS member and bent to engage detent recesses in the other member.
  • Reerences Cited formingly fitted in a slot in one member and the other end extending into an annular recess in the other UNITED STATES PATENTS member and bent to engage detent recesses in the other member.
  • This invention relates to magnetic tape recorders, particularly of the tape cassette type, and, more particularly, to an improved reel spindle driving mechanism providing an audible indication when a tape has been substantially completely or completely unwound from one reel to which a tape end is secured.
  • the objective of the invention is to provide means, particularly in tape cassette type magnetic tape recorders, adapted to indicate clearly to the user that the tape end has reached its end position, and to prevent wear on the driving wheels for the reel support spindles if the drive is not shut off in time.
  • a torque responsive clutch which is designed as an acoustic signal transmitter and is arranged in at least the driving train associated with the spindle supporting the tape supply reel, although such a torque responsive clutch can be arranged in the drive trains for both spindles.
  • the torque responsive clutch is formed by two clutch halves mounted on the reel supporting spindle, one of these clutch halves being secured to rotate with the spindle while the other clutch half serves as a preferably freely rotating friction wheel.
  • the two clutch halves are firmly but releasably operatively connected with each other by a resilient and elastic locking pawl.
  • an effective mechanical separation is provided between the spindle carrying the reel then having the tape wound thereon, particularly during feeding of the tape, and the driving pulley associated with this spindle.
  • the mechanical connection is closed or maintained during feeding of the tape and opens or disengages automatically when the tape is substantially completely unwound from the other reel to effectively separate the frictional connection between the driving element and the tape supporting spindle.
  • the driving element can also be connected, for example, when the reel supporting spindle is held against rotation in the end positions by the tape tension, without causing damage to the recorder parts, such as abrasion points on the friction surfaces of the pulleys.
  • the torque respon-- sive clutch indicates, to the user of the recorder and by a warning sound, the respective operating state, so that the user can shut off the drive of the magnetic tape recorder.
  • that clutch half secured to the reel supporting spindle can carry, firmly clamped therein, a preformed spring wire part serving as a locking pawl, and whose free end is prestressed by bending and engages into one of a number of recesses in the other clutch half and which are arranged in circumferentially spaced relation to each other, for the purpose of transmitting torque.
  • This spring end when a predetermined torque is exceeded, disengages from one recess and snaps into the circumferentially following recess, or else is lifted out of the recesses by the ring sections interposed between the recesses.
  • the recesses permit connecting the two clutch halves in any desired angular relation, while a ratchet-like alternating dipping and lifting movements of the preformed spring wire part produce a warning sound.
  • a preformed spring wire part there can also be used other locking means, for example, a spring-loaded locking pin, and the underlying concept of the invention is by no means limited to a certain number, form, or arrangement of the recesses.
  • the clutch halves are arranged concentrically with each other so that the otherwise freely rotatable clutch shaft can be mounted directly on the clutch half which is secured to rotate with the reel carrying spindle.
  • Coatings of a bearing material are provided in the area of the interengageable surfaces of the two clutch halves, and provide favorable running properties of the clutch halves on each other.
  • the spindle for reverse feeding of the tape can also be provided with a torque responsive clutch designed as an acoustic signal transmitter.
  • a torque responsive clutch designed as an acoustic signal transmitter.
  • An object of the invention is to provide an improved reel driving arrangement for magnetic recorders.
  • Another object of the invention is to provide such a driving arrangement which operates to emit an acoustic signal when a tape has been completely unwound from one reel.
  • a further object of the invention is to provide such a driving arrangement in the form of at least one torque responsive clutch included in the drive train for at least one of the reel supporting spindles.
  • Another object of the invention is -to provide such a driving arrangement in which the clutch comprises two parts which are firmly but releasably interconnected by a mechanical element cooperable with the clutch parts to provide an acoustic signal when slippage between the clutch parts occurs as a tape is completely unwound from one reel.
  • a further object of the invention is to provide such a driving arrangement in which wear of friction driving elements and damage to the tape is effectively prevented.
  • FIG. 1 is a vertical sectional view through a magnetic tape recorder embodying the invention
  • FIG. 2 is a top plan view of one clutch half
  • FIG. 3 is a bottom plan view of the other clutch half or part
  • FIG. 4 is a partly broken away bottom plan view of the clutch half or part shown in FIG. 2;
  • FIG. 5 is an elevational view of a reel supporting spindle, for. feeding tape, provided with a torque responsive. clutch embodying the invention.
  • the chassis plate 1 of a magnetic tape recorder rotatably supports a reel carrying spindle 2, for-forwarding feeding of the tape, and a reel carrier spindle 3, for reverse feeding of the tape.
  • the upper ends of spindles 2 and 3, projecting upwardly from chassis plate 1, carry coupling heads 4 which engage into the central openings of the tape reels to couple the spindles with the recording tape when a recording tape cassette (not shown) isattached on the upper surface of chassis plate 1.
  • Spindles 2 and 3 can be coupled with a rotary driving element, of the recorder, through known friction wheels which have not been shown.
  • the friction wheels can drive the spindles 2 and 3 through driving wheels 6 and 7 which, in the illustrated embodiment, are secured on a common shaft with a pulley 5 acting as a flywheel mass and which, in turn, is rotated by a driving motor.
  • reel spindle 2 mounts a torque responsive clutch 9 designed as an acoustic signal transmitter, this torque clutch, in its entirety, being illustrated in FIGS. 1 and 5.
  • Torque responsive clutch 9 simultaneously serves as a driving pulley for reel spindle 2, and which can be rotated by frictional engagement with the friction drives, while reel spindle 3 has a driving pulley 8 fixedly'secured thereto.
  • Torque responsive clutch 9 comprises two clutch halves 9' and 9", as can be seen from FIG. 1, with clutch half 9" being mounted for free rotation on spindle 2.
  • Clutch half 9" preferably is rotatably mounted on a cylindrical extension of clutch half 9', and is held against axial displacement relative to spin dle 2 by an annularcollar 10 on an annular surface of clutch half 9, and'through the medium of a snap type clamp l l.
  • the interengageable annular surfaces of the halves 9 and 9" are provided with respective coatings 12 and 13 of bearing materials.
  • Clutch half 9" receives, in a groove in its circumferential or peripheral surface, an annular body 14 of a material having a high friction coefficient, such as, for example, rubber, engageable by the switchable friction driving gear to rotate spindle 2.
  • the two clutch halves 9'v and 9" are firmly, butreleasably, connected with each other by a preformed spring wire part 15 designed as a locking pawl.
  • spring wire part 15 has one end bent to form an eyelet 16 which is inserted into a circular end of an arcuate recess 17 of clutch half 9 (FIGS. 3 and4), and has a free end bent to form an abutment 18, this free end having an initial stress imparted thereto.
  • Abutment 18 is releasably engageable in recesses 19 circumferentially spaced. from each other along an inner circular or cylindrical surface in clutch half 9".
  • clutch halves 9' and 9" are firmly, but releasably, mechanically connected with each other so that the rotation imparted by pulley 5 to drive wheel 6 can be transmitted over the intermediate drive gear to clutch half 9" and, through spring wire part 15, to clutch half or disk 9' to rotate reel supporting spindle 2.
  • a predetermined torque which occurs, for example, when spindle 2 is held against rotation by tape tension when the end of the tape is reached, free end 18 of spring wire part 15 isdisengaged from a recess 19 and travels.
  • reel supporting spindle 2 is provided with a torque responsive clutch
  • another torque responsive clutch for reel supporting spindle 3 which also serves as an acoustic signal transmitter. This insures mechanical protection for the recorder parts and the tape during reverse movement of the tape, and also indicates acoustically that the end of the tape has been reached during such reverse movement.
  • a magnetic tape recorder particularly of the tape cassette type, with tape carrier reels attached on support spindles having driving pulleys, which are coupled to a rotary driving element during forward and reverse movement of the tape, by intermediate driving gear connected with the driving pulleys: the improvement comprising a torque responsive clutch included in at least the intermediate driving gear connected to the support spindle operable to effect forward movement of the tape; said torque responsive clutch being designed as an acoustic signal generator which generates an acoustic signal responsive to the tape being completely unwound from one reel.
  • said torque responsive clutch comprising two clutch disks mounted on the support spindle, and including a first clutch disk fixedly connected with the support spindle and a second clutch disk freely rotatable on the support spindle; and resilient elastic means firmly, but releasably, interconnecting said clutch disks for conjoint rotation.
  • said resilient elastic means comprising a releasable locking pawl mounted on said first clutch disk and engageable with said second clutch disk.
  • said releasable locking pawl comprising a preformed spring wire part having one end fixed to said first clutch disk and having a free end releasably engageable with cooperating formations on said second clutch disk.
  • said spring wire part having a prestressed free end formed as a releasable abutment engageable with circumferentially spaced recesses in a cylindrical surface of said second clutch disk, said recesses being separated by interposed ring sections of said second clutch disk; said prestressed free end, when the torque on said clutch exceeds a predetermined value, being disengaged from a recess, in which it is then engaged, by the adjacent interposed ring section and engaged in following recesses in succession; said engagement and disengagement providing an acoustic signal indicating that the tape has been completely unwound from one reel.
  • respective torque responsive clutches included in the intermediate driving gear connected to both support spindles, and serving, independently of each other, as acoustic signal generators.

Landscapes

  • Mechanical Operated Clutches (AREA)
  • Casings For Electric Apparatus (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
US83817A 1970-04-21 1970-10-26 Magnetic tape recorder particularly of the tape cassette type Expired - Lifetime US3696775A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702019050 DE2019050B2 (de) 1970-04-21 1970-04-21 Magnettongeraet, insbesondere kassettenmagnettongeraet

Publications (1)

Publication Number Publication Date
US3696775A true US3696775A (en) 1972-10-10

Family

ID=5768651

Family Applications (1)

Application Number Title Priority Date Filing Date
US83817A Expired - Lifetime US3696775A (en) 1970-04-21 1970-10-26 Magnetic tape recorder particularly of the tape cassette type

Country Status (4)

Country Link
US (1) US3696775A (enrdf_load_stackoverflow)
CA (1) CA924279A (enrdf_load_stackoverflow)
DE (1) DE2019050B2 (enrdf_load_stackoverflow)
GB (1) GB1304564A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287974A (en) * 1979-10-17 1981-09-08 Coin Acceptors, Inc. Clutch assembly for vending control system
US4470561A (en) * 1983-02-11 1984-09-11 Pitney Bowes Inc. Tape recorder slip clutch
EP0515787A3 (en) * 1991-05-29 1993-03-17 Hitachi, Ltd. Magnetic recording and reproducing apparatus
US20100313346A1 (en) * 2009-06-15 2010-12-16 Boyce Hornberger Rigid, adjustable-length flapper control rod for a toilet and associated methods

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1167285A (en) * 1913-09-02 1916-01-04 Gus Olaus Flogland Safety-coupling.
DE418665C (de) * 1924-07-04 1925-09-17 Telegraphie Ges M B H System S Elektromagnetische Sprechmaschine
US2712448A (en) * 1949-06-27 1955-07-05 Ralph J Samuels Magnetic sound recorders
US2948258A (en) * 1958-07-30 1960-08-09 Walter P Koechel Signal device for tape recorders
US3150377A (en) * 1958-07-22 1964-09-22 Alois Handler Indicator of exposed length of film for a motion picture camera
US3167267A (en) * 1961-10-24 1965-01-26 Litton Systems Inc Tape recorder

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1167285A (en) * 1913-09-02 1916-01-04 Gus Olaus Flogland Safety-coupling.
DE418665C (de) * 1924-07-04 1925-09-17 Telegraphie Ges M B H System S Elektromagnetische Sprechmaschine
US2712448A (en) * 1949-06-27 1955-07-05 Ralph J Samuels Magnetic sound recorders
US3150377A (en) * 1958-07-22 1964-09-22 Alois Handler Indicator of exposed length of film for a motion picture camera
US2948258A (en) * 1958-07-30 1960-08-09 Walter P Koechel Signal device for tape recorders
US3167267A (en) * 1961-10-24 1965-01-26 Litton Systems Inc Tape recorder

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287974A (en) * 1979-10-17 1981-09-08 Coin Acceptors, Inc. Clutch assembly for vending control system
US4470561A (en) * 1983-02-11 1984-09-11 Pitney Bowes Inc. Tape recorder slip clutch
EP0515787A3 (en) * 1991-05-29 1993-03-17 Hitachi, Ltd. Magnetic recording and reproducing apparatus
US5301073A (en) * 1991-05-29 1994-04-05 Hitachi, Ltd. Take-up pulley with torque-limiting mechanism for magnetic recording and reproducing apparatus
US20100313346A1 (en) * 2009-06-15 2010-12-16 Boyce Hornberger Rigid, adjustable-length flapper control rod for a toilet and associated methods
US8800070B2 (en) * 2009-06-15 2014-08-12 Boyce Hornberger Rigid, adjustable-length flapper control rod for a toilet and associated methods

Also Published As

Publication number Publication date
DE2019050A1 (de) 1971-11-11
GB1304564A (enrdf_load_stackoverflow) 1973-01-24
CA924279A (en) 1973-04-10
DE2019050B2 (de) 1972-06-15

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