US3727734A - Bidirectional lever arm clutch - Google Patents

Bidirectional lever arm clutch Download PDF

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Publication number
US3727734A
US3727734A US00239084A US3727734DA US3727734A US 3727734 A US3727734 A US 3727734A US 00239084 A US00239084 A US 00239084A US 3727734D A US3727734D A US 3727734DA US 3727734 A US3727734 A US 3727734A
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US
United States
Prior art keywords
rotatable
lever arms
unidirectionally
primary axis
internal device
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
US00239084A
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English (en)
Inventor
K Hanson
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Individual
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Individual
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Publication date
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Publication of US3727734A publication Critical patent/US3727734A/en
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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
    • G11B15/44—Speed-changing arrangements; Reversing arrangements; Drive transfer means therefor
    • 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
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/12—Freewheels or freewheel clutches with hinged pawl co-operating with teeth, cogs, or the like
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2133—Pawls and ratchets
    • Y10T74/2136—Pivoted pawls

Definitions

  • ABSTRACT A bidirectionally rotatable mechanism for separately driving two unidirectionally rotatably driven devices is 52 US. Cl. ..192/4s.92, 192/46, 192/51, disclosed- The mechanism imludes a bidireclionally 74577 R, 242/201 driving external rim that encompasses a bidirectionally 511 Int.
  • Such mechanisms can involve elaborate mechanical arrangements for achieving reversal of the direction of rotation of the reel-see G. Pabst U.S. Pat. No. 3,475,563.
  • the present invention is directed toward an improved drive mechanism for achieving such bidirectional rotation of the reels.
  • the present invention is directed toward a mechanism that includes a clutch-like device for selectively driving either the read/record or rewind reel of a cassette tape system by means of a bidirectionally rotatable electric motor.
  • the mechanism includes a rotatable external rim-like pulley that is driven in the clockwise or counterclockwise by a belt and bidirectionally rotatable electric motor.
  • Internal to the external rim is a rotatable device that supports two axially oppositely directioned lever arms on diametrically opposed external surfaces. The lever arms are rotatably pinned to the internal device to oppositely rotate into substantial axial alignment the external rim and internal device as determined by associated stops on the internal device.
  • Pins on the external rim couple the lever arms on the internal device through slots on the ends of the lever arms such that rotation of the external rim rotates the two lever arms about their axes of rotation; when the external rim is rotated in, e.g., the clockwise direction a first lever arm is rotated in axial alignment while the second lever arm is rotated out of axial alignment, and, conversely, when the external rim is rotated in the, e.g., counterclockwise direction the second lever arm is rotated in axial alignment while the first lever arm is rotated out of axial alignment.
  • the lever arms engages a stop in an associated rotatable member; thus, the associated rotatable members are separately driven in opposite directions. The rotatable members then drive the associated read/record or rewind reels of the tape cassette.
  • FIG. 1 is a plan view of a magnetic tape cassette unit incorporating the present invention.
  • FIG. 2 is a partially cut-away view of the magnetic tape cassette unit of FIG. 1 taken along line 2-2.
  • FIG. 3 is a partially cut-away view of the magnetic tape cassette unit of FIG. 1 taken along line 3--3.
  • Magnetic tape cassette unit 10 includes magnetic tape cassette l2 and the read/record head assembly 14 for reading out of and writing into the magnetic tape held on the read/record and rewind reels of magnetic tape cassette 12.
  • the magnetic tape as held on the read/record and rewind reels is driven past read/record head 14 by means of electric motor 16 and its associated driving chain.
  • This driving chain includes a belt 18 rotatably coupled to driving pulley 17 and idling pulley 20 to which is integrally formed a second idling pulley 22.
  • Belt 24 is, in turn, rotatably coupled to idling pulley 22 and mechanism 26 which is a bidirectionally driven, by bidirectionally rotatable motor 16, rotatable mechanism for separately unidirectionally driving read/record pulley 28 in a, e.g., counterclockwise direction or rewind pulley 30 in a, e.g., counterclockwise direction as by belt 32.
  • FIGS. 2 and 3 there are shown partially cut-away views of the magnetic tape cassette unit 10 of FIG. 1 taken along lines 2-2 and 3-3.
  • the present invention is directed toward the mechanism 26 that includes a clutch-like device for selectively driving either the read reel sprocket 40 or the rewind reel sprocket 42 of the magnetic tape cassette unit 10 by means of the bidirectional electric motor 16 and the associated pulleys and belts.
  • Mechanism 26 includes a rotatable external rim-like pulley 44 that is driven in a clockwise or counterclockwise direction by belt 24. lnternal to the external rim 44 is a rotatable internal device 46 that supports two axially oppositely directioned lever arms 48 and 49 (see FIG.
  • Pins 56 and 57 which are integral with the external rim 44, couple the lever arms 48 and 49 on the device 46 through their associated slots 58 and 59 on the ends of the lever arms 48 and 49 such that rotation of external rim 44 rotates the two lever arms 48 and 49 about their axes of rotation, i.e., pins 52 and 53, respectively; when the external rim 44 is rotated in, e.g., the counterclockwise direction as seen from FIG. 1, the first lever arm ,48 is rotated into axial alignment, i.e., parallel to axis 60 of mechanism 44, while the second lever arm 49 is rotated out of axial alignment and, conversely, when the external rim 44 is rotated in the, e.g., clockwise direction as seen from FIG.
  • the second lever arm 49 is rotated into axial alignment whilethe first lever arm' 48 is rotated out of axial alignment.
  • one of the lever arms 48 or 49 is in axial alignment, i.e., parallel to axis 60 of mechanism 26, it engages an associated stop 62 or 63 in an associated rotatable member 28--see FIG. 2--or pulley 64-see FIG. 3-; thus, the associated rotatable member 28 or pulley 64 are separately alternatively driven in opposite, e.g., clockwise or counterclockwise directions.
  • the member 28 through shaft 66 then drives the read/write sprocket 40 and the associated reel while the pulley 64 through belt 32 and pulley 30 drives the rewind sprocket 42 and the associated reel.
  • external rim 44 is illustrated as being driven in a counterclockwise direction, as seen from FIG. 1; thus, in FIG. 2 lever arm 48 is shown in solid lines, in axial alignment with axis 60 and in engagement with stop 62 in member 28 for driving member 28 in the counterclockwise direction. Member 28, in turn, drives shaft 66 and read/write sprocket 40 in a counterclockwise direction.
  • Corresponding lever arm 49, on the back side of device 46 from lever arm 48, is shown in solid lines in FIG. 3 as being out of axial alignment with axis 60 and not in engagement with its associated stop 63 such that pulley 64 receives no rotative driving force from device 46.
  • Pulley 64 by means of belt 32, pulley 30, shaft 68 and rewind sprocket 42 would then drive the associated rewind reel to rewind the magnetic tape in tape cassette l2. correspondingly, the clockwise rotation of rim 44 would, as stated above, rotate lever arm 48 out of axial alignment and out of engagement with stop 62 in member 28 such that read/record sprocket 40 receives no rotative driving force from device 46; this mode of operation is illustrated by the positions of lever arms 48 and 49 in their dash line orientations of FIGS. 2 and 3.
  • a bidirectionally rotatable mechanism for driving two unidirectionally rotatable elements comprising:
  • a bidirectionally rotatable internal device having two diametrically opposed surfaces, said internal device internal to said external rim and rotatable about the same primary axis;
  • first and second lever arms rotatably mounted on first and second ones, respectively, of said two diametrically opposed surfaces, said first and second lever arms being alternatively rotatable into substantial alignment with said primary axis but oppositely directioned;
  • first and second coupling means affixed to said external rim for alternatively rotating said first and second lever arms, respectively, into substantial alignment and substantial misalignment, respectively, or vice versa, with said primary axis;
  • each of said first and second unidirectionally rotatable elements including associated stop means for alternatively engaging said first or said second lever arm when said first or said second lever arm is in its substantial axial alignmentwith said primary axis.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Replacement Of Web Rolls (AREA)
  • Winding Of Webs (AREA)
US00239084A 1972-03-29 1972-03-29 Bidirectional lever arm clutch Expired - Lifetime US3727734A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23908472A 1972-03-29 1972-03-29

Publications (1)

Publication Number Publication Date
US3727734A true US3727734A (en) 1973-04-17

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ID=22900532

Family Applications (1)

Application Number Title Priority Date Filing Date
US00239084A Expired - Lifetime US3727734A (en) 1972-03-29 1972-03-29 Bidirectional lever arm clutch

Country Status (6)

Country Link
US (1) US3727734A (enrdf_load_stackoverflow)
JP (1) JPS5512672B2 (enrdf_load_stackoverflow)
DE (1) DE2313922B2 (enrdf_load_stackoverflow)
FR (1) FR2182912B1 (enrdf_load_stackoverflow)
GB (1) GB1432152A (enrdf_load_stackoverflow)
IT (1) IT981712B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266479A (en) * 1977-12-12 1981-05-12 Sperry Corporation Multi-function mechanical printer drive means

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5920697U (ja) * 1982-07-29 1984-02-08 株式会社東芝 電子機器ハウジング

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US344160A (en) * 1886-06-22 Screw-driver
US547386A (en) * 1895-10-01 Clutch
US684482A (en) * 1900-10-01 1901-10-15 Harry Ernest Walters Clutch for the transmission of power.
US1563742A (en) * 1925-06-24 1925-12-01 Ingersoll Rand Co Clutch mechanism for double-drum hoists
US2866109A (en) * 1958-12-23 Axial flux electromagnetic machinery
US3495789A (en) * 1968-04-22 1970-02-17 Minnesota Mining & Mfg Web transport driving and braking mechanism
US3623680A (en) * 1969-06-27 1971-11-30 Xerox Corp Clutch/brake mechanism

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US344160A (en) * 1886-06-22 Screw-driver
US547386A (en) * 1895-10-01 Clutch
US2866109A (en) * 1958-12-23 Axial flux electromagnetic machinery
US684482A (en) * 1900-10-01 1901-10-15 Harry Ernest Walters Clutch for the transmission of power.
US1563742A (en) * 1925-06-24 1925-12-01 Ingersoll Rand Co Clutch mechanism for double-drum hoists
US3495789A (en) * 1968-04-22 1970-02-17 Minnesota Mining & Mfg Web transport driving and braking mechanism
US3623680A (en) * 1969-06-27 1971-11-30 Xerox Corp Clutch/brake mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266479A (en) * 1977-12-12 1981-05-12 Sperry Corporation Multi-function mechanical printer drive means

Also Published As

Publication number Publication date
JPS4910009A (enrdf_load_stackoverflow) 1974-01-29
FR2182912B1 (enrdf_load_stackoverflow) 1979-05-11
DE2313922B2 (de) 1977-03-31
DE2313922A1 (de) 1973-10-04
GB1432152A (en) 1976-04-14
JPS5512672B2 (enrdf_load_stackoverflow) 1980-04-03
FR2182912A1 (enrdf_load_stackoverflow) 1973-12-14
IT981712B (it) 1974-10-10

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