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WO1993009539A1 - Appareil pour commander le blocage des bobines d'une cassette - Google Patents

Appareil pour commander le blocage des bobines d'une cassette Download PDF

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Publication number
WO1993009539A1
WO1993009539A1 PCT/CA1991/000394 CA9100394W WO9309539A1 WO 1993009539 A1 WO1993009539 A1 WO 1993009539A1 CA 9100394 W CA9100394 W CA 9100394W WO 9309539 A1 WO9309539 A1 WO 9309539A1
Authority
WO
WIPO (PCT)
Prior art keywords
tape
reel
take
locking arm
tooth
Prior art date
Application number
PCT/CA1991/000394
Other languages
English (en)
Inventor
Robert Granzotto
Original Assignee
Arena Recreations (Toronto) Limited And William Lawrence Heisey, A Partnership Trading As Single Play Video
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 Arena Recreations (Toronto) Limited And William Lawrence Heisey, A Partnership Trading As Single Play Video filed Critical Arena Recreations (Toronto) Limited And William Lawrence Heisey, A Partnership Trading As Single Play Video
Priority to PCT/CA1991/000394 priority Critical patent/WO1993009539A1/fr
Priority to US07/817,279 priority patent/US5228637A/en
Publication of WO1993009539A1 publication Critical patent/WO1993009539A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/04—Magazines; Cassettes for webs or filaments
    • G11B23/08—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
    • G11B23/087—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
    • G11B23/08707—Details
    • G11B23/08721—Brakes for tapes or tape reels

Definitions

  • This invention relates to a means to control the locking of a cassette reel against rotation in a forward feed direction.
  • U.S. Patent No. 4,632,335 to Dickson et al. issued December 30, 1986 discloses a tape cassette having a locking mechanism which allows the tape to be played in a forward feed direction but which locks the tape against rewinding unless unlocking pins of appropriate length are inserted into the locking mechanism.
  • Such a cassette when recorded with a video taped movie, allows for the rental of the cassette on a single play basis since only the rental outlet will have at its disposal a means to unlock the cassette to allow rewinding.
  • the cassette suffers the drawback that the renter is unable to replay any segments of the rented movie. Further, the movie must be returned to the rental outlet without being rewound, which increases the overhead before the cassette may be rented again.
  • a tape cassette comprising: supply reel means; take-up reel means; lock means for locking at least one of said supply reel means and said take-up reel means against rotation in a forward feed direction when actuated; indicator means for indicating the amount of tape on at least one of said supply reel means and said take-up reel means; lock actuation means enabled by said indicator means when said indicator means indicates a first pre-selected amount of tape on one of said supply reel means and said take-up reel means, said lock actuation means, when enabled, responding to said indicator means during rewinding of said tape for actuating said lock means when said indicator means indicates a second pre-selected amount of tape on one of said supply reel means and said take-up reel means whereby said tape is thereafter inhibited from feeding in a forward feed direction; and reset means selectively operable to disable said lock actuation means at least when said lock actuation means has actuated said lock means.
  • figure 1 is a plan view of a tape cassette including a mechanism made in accordance with this invention
  • figure 2 is a plan view of a portion of a figure 1
  • figure 2a is a plan view of portion of figure 2
  • figure 3 is a sectional view along the lines 3-3 of figure
  • figure 4 is a plan view of a portion of a the tape cassette of figure 1
  • figure 4a is a sectional view along the lines 4a-4a of figure 4
  • figure 5 is a plan view of a portion of figure 1
  • figure 5a is a sectional view along the lines 5a-5a of figure 5
  • figure 6 is a perspective view of a portion of figure 1
  • figures 7 and 8 are front and top views of elements of figure 1
  • figure 8a is a sectional view along the lines 8a-8a of figure 8
  • figure 9 is a front and top view of an element of figure 1
  • figures 10 through 13 are plan views illustrating the operation of the tape cassette of figure 1.
  • a tape cassette generally indicated at 10 comprises a supply reel 12 and a take-up reel 14.
  • a tape 16 is shown wound around the hub 18 of the supply reel and extends along one side of the cassette to the hub 20 of the take- up reel.
  • the forward feed direction for the take-up reel is illustrated at 62.
  • a lock means for the take-up reel includes locking arm 92 (detailed in figure 7) and the elements detailed in figures 2, 2a, and 3.
  • the lock means comprises an inner locking member 22 having a thickened annular base 24 with an exterior annular lip 26 and a plurality of interior upstanding snaps 28 comprising legs 30 and shoulders 32.
  • the inner locking member has a bulbous pawl supporting slot 34 which receives the complimentarily shaped bulbous base 33 of pawl 36.
  • the pawl has a convex back 35 protruding in the counterclockwise direction and a front tapering to a tip 37 in the clockwise direction.
  • An outer locking member 40 comprises a thin annular disk 41 having a medial thickened annulus 42 with a triangular notch 44 therein. The notch slopes to a stop 46 at the clockwise end of the notch.
  • the outer locking member has an inner diameter less than the diameter of lip 26 of the inner member such that the outer member rests on the lip of the inner locking member and may rotate with respect to the inner locking member.
  • a locking tooth 50 is formed on the periphery of the outer locking member ninety degrees from the triangular notch 44 in a counterclockwise direction.
  • a displacer ring 56 rests on the outer locking member between the medial thickened annulus 42 of the outer locking member and the thickened annular base 24 of the inner locking member.
  • the displacer ring has a clearance fit between thickened annulus 42 and thickened annular base 24.
  • the displacer ring is gapped and the pawl is located within this gap.
  • the gap of the displacer ring terminates at its counterclockwise end in stop 52 and at its clockwise end in ramp 54.
  • the locking means does not impede counterclockwise rotation of the take-up reel, which is the direction of rotation of the take-up reel during rewinding of tape from the take-up reel to the supply reel.
  • This torque causes the tip 37 of the pawl to enter the triangular notch as the pawl is rotated clockwise into registration therewith until the tip of the pawl comes into abutment with stop 46.
  • the inner locking member is locked to the outer locking member.
  • the outer locking member is held from rotation, this stops the take- up reel.
  • the clockwise direction for the take-up reel is the forward feed direction, accordingly, when the tooth 50 is held from rotation, the take-up reel is inhibited from rotating in a forward feed direction but may rotate in a reverse feed direction.
  • the cassette includes a leaf spring 64 fixed at one end between the supply reel and take-up reel with its free end inclined toward the take- up reel in the path of locking tooth 50. Accordingly, when the take-up reel is rotated in a counterclockwise (reverse feed) direction, tooth 50 moves into abutment with the free end of the leaf spring so that the tooth, and hence the outer locking member 40, thereafter remain stationary with continued counterclockwise rotation of the take-up reel.
  • the cassette has a follower arm 70, rotatably mounted at one end to post 72.
  • the follower arm has a medially mounted rotatable wheel 74 and a distally mounted rotatable wheel 76 at the free end of the follower arm.
  • the follower arm is dimensioned such that at most one of wheels 74 and 76 is in contact with the tape 16 of the cassette.
  • the angular position of the follower arm acts as an indicator of the amount of tape on the supply reel 12 or take-up reel 14, as follows.
  • the cassette is initially in a fully rewound condition and the cassette is then operated in a forward feed direction to transfer tape to the take-up reel
  • the outer layer of tape will eventually contact the medial wheel 74.
  • the follower arm will deflect in a counterclockwise direction about post 72 until the last layer of tape is wound off the supply reel. Accordingly, while the follower arm is deflected counterclockwise by the layers of tape wound onto the take-up reel, the arm indicates the amount of tape on the take-up reel by its angular position.
  • the outermost layer of the building layers of tape on the supply reel will eventually contact the distal wheel 76. Thereafter, additional layers of tape added to the supply reel will deflect the follower arm in a clockwise sense about the post 72. Accordingly, while the follower arm is deflected clockwise by the layers of tape wound onto the supply reel, the arm indicates the amount of tape on the supply reel by its angular position.
  • the two wheels 74 and 76 of the follower arm 70 are mounted to the arm by three legs: 80a, 80b, and 80c and 82a, 82b, and 82c, respectively.
  • 80a, 80b, and 80c and 82a, 82b, and 82c respectively.
  • the outwardly facing portion of the heads 84 of the three legs 80 are radiused and are received in a radiused circumferential notch 86 in the wheel 76.
  • a leg supporting pin 88 is press fit between the three legs 80.
  • the mount for wheel 74 is of similar construction. In view of this construction, the wheels 74 and 76 are not only free to rotate but also have a limited freedom to pivot on their mounts.
  • the legs of the follower arm are positioned so that when wheel 74 or 76 contacts the tape 16 of the cassette, the point of contact of the tape is between legs 80a and 80b or 82a and 82b, respectively, for most permissible angles of rotation of the follower arm. Accordingly, the reaction force on the wheel of the follower arm is taken up by two legs of the follower arm which provides good wheel stability and hence minimizes the generation of noise due to the wheel during tape play.
  • the cassette also has a take-up reel lock actuation means indicated generally at 90.
  • Lock actuation means 90 as well as the locking arm 92 of the lock means, are illustrated in greater detail in figures 5 through 9.
  • locking arm 92 (detailed in figure 7) is rotatably mounted at one end on post 94.
  • the locking arm has a deflection face 95, an angled dwell f- ce 96, and an enlarged locking tip 98.
  • the lock actuation means 90 comprises a locking arm displacer 100 (detailed in figures 8 and 8a) rotatably mounted on post 72.
  • a detent 102 is slidably mounted to the locking arm displacer such that the detent may slide radially with respect to the post 72 by virtue of feet 105a and 105b of legs 103a and 103b of the detent which slidingly engage shoulders 107a and 107b of the locking arm displacer.
  • a compression spring 104 biases the detent radially inwardly.
  • the locking arm displacer supports an indicator flag 108.
  • a torsion spring 99 urges the locking arm 92 against the locking arm displacer 100.
  • follower arm 70 is also rotatably mounted on post 72.
  • the follower arm has an arcuate portion 110 centered about post 72.
  • the arcuate portion has a notched segment 112 extending in a clockwise direction from stop 114 and an unnotched segment 116 extending in the other direction from the stop 114.
  • the arcuate portion 110 of the follower arm is positioned on post 72 radially inwardly of the detent 102 of the locking arm displacer with the detent urged into abutment with the arcuate portion 110 due to compression spring 104.
  • the detent will snap into the notched segment 112 of the arcuate portion of the follower arm as soon as the detent passes stop 114 (as illustrated in figure 11).
  • the point where this occurs is referred to herein as the "trigger point”. Since the follower arm is rotated counterclockwise by the layers of tape building on the take-up reel, the trigger point is reached when a pre-determined amount of tape is wound onto the take-up reel.
  • the lock actuation means is enabled when the detent of the locking arm displacer is received in the notched segment 112 of the follower arm.
  • Figures 5, 5a, and 6 also illustrate a reset means comprising reset lever 120 (detailed in figure 9) rotatably mounted to post 72 and biased by torsion spring 122 so that the head 124 of the reset lever abuts a stack of notched disks 130.
  • Reset lever 120 has a cam 126.
  • a torsion spring 106 urges the locking arm displacer toward the reset lever; the locking arm displacer is in its rest position when it abuts the reset lever.
  • the stack of notched disks have notches 134 and the notch of the bottom disk 130a in the stack has a camming surface 136; this disk may be considered a camming disk.
  • Figures 10 through 13 illustrate the operation of the cassette.
  • Figure 10 shows the cassette with the lock actuation means in a disabled state, that is, with the detent 102 of the locking arm displacer abutting the unnotched segment 116 of the arcuate portion of the follower arm.
  • the locking arm displacer In the disabled state the locking arm displacer is in its rest position, biased against the reset lever 120 by torsion spring 106.
  • the tape With the lock actuation means disabled, the tape may be freely forward fed and rewound without any effect on the lock actuation means so long as the trigger point is not passed. This is for the reason that the follower arm is not engaged with the lock actuation means when the lock actuation means is in the disabled state.
  • the lock actuation means when enabled, responds to the follower arm during rewinding, as follows. Once the building layers of tape on the supply reel rotate the follower arm clockwise to the point where the stop 114 abuts the detent 102, further rewinding causes stop 114 to deflect the detent, and the locking arm displacer which carries it, in a clockwise sense about post 72. Since locking arm 92 is biased against the locking arm displacer by torsion spring 99, deflection of the locking arm displacer displaces the locking arm in a counterclockwise sense about post 94.
  • the dimensions of the device are chosen so that if, during rewinding, more then a pre-selected amount of tape is built up on the supply reel when the lock actuation means are enabled, the follower arm is rotated to an angle whereat the locking arm is displaced by the locking arm displacer into the path of the locking tooth 50.
  • the point at which the locking arm has moved into the path of the locking tooth is referred to herein as the lock-up point; once the locking arm has reached the lock-up point, the lock means are actuated.
  • Figure 12 illustrates the cassette with the lock means actuated.
  • the cassette may continue to be rewound and tooth 50 will simply rest on leaf spring 64.
  • the take-up reel rotates in a clockwise sense and the tooth moves with the take-up reel until it abuts the locking arm 92 whereupon the tooth will be blocked from further clockwise rotation (as is illustrated in figure 12) .
  • continued clockwise rotation of the take-up reel when the tooth 50 is blocked from rotation will cause the tooth supporting outer locking member 40 to lock to the inner locking member 22.
  • the inner locking member is fixed to the take-up reel, this locks the take-up reel against further clockwise (forward feed) rotation.
  • leaf spring 64 Two purposes of leaf spring 64 are to prevent the possibility of the locking tooth jamming against the locking arm during rewinding and to minimize noise. That is, when the locking arm has moved to the edge of the path of tooth 50 during rewinding, in the absence of leaf spring 64, the tooth would tick against the locking arm for several revolutions as it passed the locking arm until the locking arm had been displaced sufficiently that the tooth would stop against the locking arm. During this period, there is a possibility of the tooth jamming against the end of the locking arm. The leaf spring prevents this as it forms a rest for the tooth on rewinding. While it is possible the tooth could tick past the locking arm on forward feed operation, this is unlikely since the locking arm is only displaced toward the path of the tooth by rewinding.
  • dwell face 96 of the locking arm is provided to limit the extent to which the locking arm is displaced, as follows.
  • the free end of the locking arm displacer initially moves along the deflection face 95 of the locking arm.
  • the free end of the locking arm displacer moves into abutment with the dwell face 96 of the locking arm.
  • further rotation of the locking displacer arm in a clockwise sense about post 72 moves the free end of the locking arm displacer along the dwell face 96 which maintains the deflection of the locking arm but does not further deflect same.
  • the dwell face of the locking arm allows, within certain bounds, one cassette construction to be used with varying amounts of tape spliced to the leader tape of the cassette. That is, a cassette is typically manufactured with only transparent leader tape on the reels. At a duplicator, magnetic tape is then spliced to this leader tape. Where the magnetic tape is pre ⁇ recorded, the amount of tape that is to be spliced to the leader tape of the cassette may vary. The lock-up point is, however, reached when a pre-determined amount of tape has been wound onto the supply reel irrespective of the length of the tape spliced to the tape of the cassette.
  • the dwell face of the locking arm keeps the locking arm in blocking relation with the locking tooth for different amounts of tape spliced to the tape of the cassette. That is, the dwell face may be of a length which ensures the largest anticipated amount of tape on the supply reel does not urge the free end of the locking arm displacer to rotate past the dwell face.
  • Stop 78 (of figure 1 ) is positioned to limit the clockwise rotation of the follower arm to just past the point to which the arm would be moved by rewinding of the longest anticipated tape spliced onto the leader tape of the cassette.
  • the stop 78 ensures the follower arm is not rotated to a point whereat the free end of the locking arm displacer rotates past the dwell face of the locking arm. Stop 78 also avoids an improper reset of the lock actuation means for reasons which will be described hereinafter.
  • the enlarged locking tip 98 (seen in figure 7) of the locking arm ensures there is no possibility of the locking tooth missing the locking arm during forward feeding in the lock-up state. This would otherwise be a possibility due to the fact the supply and take-up reels float within the cassette.
  • abutment 140 (seen in figure 1) positioned in opposition to the locking arm ensures the take-up reel is not translated such that the locking tooth misses the locking arm during forward feeding in the lock-up state.
  • the reset means comprise reset lever 120. As aforenoted, the reset lever is biased against notched disks 130.
  • the notched disks are a stack of concentric disks having a height less than the height H (see figure 9) of the head 124 of the reset lever.
  • the disks Prior to a resetting operation, the disks are in a scrambled state such that their notches 134 are not aligned with the head 124 of the reset lever. In this state, the reset lever abuts the periphery of the stack of notched disks as illustrated in figures 5 and 6; this is referred to herein as the inoperative position of the reset lever.
  • the disks are manipulable by some means external of the cassette. If the disks are manipulated to align the notch of each disk with the head 124 of the reset lever 120, then the head of the reset lever will snap into the aligned notches under the urging of torsion spring 122; this is the reset position of the reset lever and is illustrated in figure 13.
  • the reset lever rotates counterclockwise on post 72 which results in cam 126 of the reset lever camming the detent 102 of the locking arm displacer out of the notch 112 in the follower arm.
  • the locking arm displacer is freed to rotate counterclockwise under the urging of torsion spring 106 to its rest position in abutment with the reset lever.
  • the locking arm 92 follows the locking arm displacer due to the urging of torsion spring 99 so that it continues to rest against the locking arm displacer.
  • detent 102 will now abut the unnotched segment 116 of the arcuate portion of the follower arm so that the lock actuation means is now in its disabled state.
  • the cassette with the reset lever in its reset position and the lock actuation means disabled is illustrated in figure 13.
  • the follower arm is stationary during a reset operation. This is for the reason that the lock-up point is reached by building layers of tape on the supply reel deflecting the follower arm, consequently, the tape on the supply reel acts to prevent any counterclockwise rotation of the follower arm due to the sliding frictional engagement of the end of the detent with the unnotched arcuate portion of the follower arm as the detent rotates counterclockwise under the urging of torsion spring 106 to its rest position. As aforedescribed, the locking arm displacer is in its rest position when it abuts the reset lever.
  • the rest position of the locking arm displacer when the reset lever is in its reset position is displaced in a counterclockwise direction from the rest position of the locking arm displacer when the reset lever is in its inoperative position.
  • the dimensions of the cassette may be chosen so that the reset rest position of the locking arm displacer places the detent of the locking arm displacer in a position which is displaced counterclockwise from the counterclockwise position of the notch 114 of the follower arm when the follower arm is stopped against stop 79.
  • tape should be rewound to the lock ⁇ up point before a resetting operation since otherwise a resetting operation may not disable the lock actuation means.
  • the camming disk 130a of the stack of notched disks may be rotated so that camming surface 136 cams the head 124 of the reset lever out of the notches 134 in the remaining notched disks 130 whereupon the remaining notched disks may be again scrambled so that their notches are no longer aligned with the head of the reset lever; the camming disk 130a may then also be scrambled.
  • the stack of notched disks function as a combination lock since the angular position of the notches of the disks must be known in order to allow the notches to be aligned with the head of the reset lever.
  • the details of construction of a suitable notched disk arrangement functioning as a combination lock are described in U.S. Patent No. 4,874,143 to Armstrong and Granzotto dated June 9, 1988, the disclosure of which is incorporated herein by reference.
  • the stop 78 for the follower arm prevents the follower arm from rotating the locking arm displacer clockwise sufficiently to result in the cam of the reset lever camming detent 102 out of the notch of the follower arm when the reset lever is in its inoperative position.
  • the flag 108 (see figures 5 and 8) of the locking arm displacer 100 underlies a window (not shown) in the housing of the cassette. Flag 108 will move under the window in the cassette housing when the locking arm displacer rotates. Accordingly, different portions of the surface of the flag 108 will be centered under the window depending on the angular position of the locking arm displacer. Consequently, the flag 108 may be divided into three colour coded zones to indicate different states for the cassette, as follows.
  • the locking arm displacer has been rotated toward the limit of its clockwise rotation when the cassette is in the lock-up state. Accordingly, the zone 108a of the flag at the counterclockwise end of the flag, may indicate the cassette is in the lock-up state.
  • a middle zone 108b of the flag may indicate the locking arm displacer is at or near its rest position against the reset lever and the reset lever is in its inoperative position.
  • This middle zone accordingly indicates the tape of the cassette may be forward fed or rewound.
  • the reset lever is in its reset position, the locking arm displacer is resting against the reset lever (since the detent has been cammed out of the notch in the follower arm) and so is at the limit of its counterclockwise rotation.
  • a third zone 108c at the clockwise end of the flag indicates that the lock actuation means is disabled and the reset lever is in its reset position. The purpose for such an indication will become clear hereinafter.
  • the cassette when the lock actuation means is in a disabled state and the reset lever is in its inoperative position, allows the tape to be forward fed from beginning to end only once since thereafter the lock actuation means is enabled which inhibits forward feeding after a pre ⁇ selected amount of tape has been rewound onto the supply reel (such that the cassette is in the lock-up state).
  • the cassette does, however, allow limited replay of portions of the tape.
  • the cassette may be constructed so that the trigger point is at the point where 75 minutes (SP mode) of the tape has been wound onto the take-up reel and the lock-up point is at the point where 75 minutes (SP mode) of the tape has been wound onto the supply reel (after the lock actuation means has been enabled).
  • the first 75 minutes of the tape up to the trigger point may be replayed an indefinite number of times so long as the 75 minute point is not passed. Also, after the trigger point has been reached, the last 75 minutes of the tape may be replayed an indefinite number of times.
  • the tape will lock up if an attempt is made thereafter to forward feed the tape. Of course once the lock-up point has been passed, it is still possible to rewind the tape.
  • a tape machine is typically designed to stop rewinding at the beginning of the magnetic tape. If this point is overshot such that some of the leader tape is wound off the take-up reel, some machines will automatically forward feed back to the beginning of the magnetic tape and will not allow the cassette to be ejected until this has been accomplished.
  • the cassette of this invention In order for the cassette of this invention to function with such tape machines in the worst case scenario, the cassette must be able to forward feed sufficiently to take up all of the leader tape when it is in the lock-up state. Accordingly, the cassette is manufactured with approximately 5.75 inches of leader tape on the take-up reel and is configured to permit up to about 1 3/4 forward feed revolutions of the take-up reel while the cassette is in the lock-up state, as follows.
  • snaps 28a and 28b of the inner locking member of the locking means are spaced more widely than the other snaps, consequently, the inner locking member always has a fixed orientation on the take-up reel 14. This orientation is such that the point of connection 17 of the tape 16 to the take-up reel is displaced slightly in a counterclockwise direction from pawl 36. Furthermore, since tooth 50 of the outer locking member is positioned ninety degrees in a counterclockwise direction from notch 44, the notch 44 is in a pre-determined position when the tooth 50 rests on the leaf spring 64 during rewinding.
  • notch 44 on rewinding is such that when the last layer of tape has been wound off the take-up reel and rewinding is complete, the pawl 36 is displaced slightly in a clockwise direction from the position of the notch 44, as is illustrated in figure 1.
  • the take-up reel is free to rotate approximately three quarters of a clockwise revolution while the locking tooth rotates with the take-up reel from its rest position on the leaf spring into abutment with the locking arm and is free to rotate approximately a just under a further one clockwise revolution while the pawl rotates into registration with the notch 44.
  • the present invention has utility in the video rental industry. If a cassette as aforedescribed has a tape recorded with a movie, the cassette may be rented in a rewound state with the lock actuation means disabled. The rental allows the renter one complete viewing of the movie with the ability to review portions of the movie and the ability to rewind the tape prior to its return. The rental outlet may have access to the combination for the notched disks of the cassette so that the lock actuation means may again be disabled whereupon the cassette is once more ready for rental.
  • the notches of the disk stack may be aligned with the reset lever head so that the reset lever snaps to its reset position and the cassette left in that condition so that, as aforedescribed, the lock actuation means cannot be enabled. Consequently, there will be no restriction on the forward feeding of tape in the cassette which is sold.
  • the follower arm could be modified such that it included only one wheel along its length which wheel was biased into abutment with either the outer layer of tape of the supply reel or the outer layer of tape of the take-up reel.
  • two wheels for the follower arm are preferred as this is believed to be a more tamper proof construction.
  • Other variations within the spirit of this invention will be apparent to those skilled in the art.

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  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)

Abstract

L'invention se rapporte à une cassette à bande (10) qui ne permet qu'une seule lecture complète de la bande. A cet effet, la cassette comprend un bras suiveur (70) indiquant la quantité de bande enroulée sur la bobine réceptrice (14). Lorsqu'une quantité prédéterminée de bande est enroulée sur la bobine réceptrice, un organe actuateur de verrou est validé pour que, lors du rebobinage ultérieur de la bande, un bras de verrouillage (92) vienne se placer sur la trajectoire d'une dent portée par un élément de verrouillage (90) de la bobine réceptrice, lorsqu'une quantité prédéterminée de bande a été enroulée sur la bobine débitrice. Ainsi, toute avance ultérieure de la bande est empêchée, car l'élément de verrouillage se bloque sur le reste de bobine réceptrice, grâce à un cliquet porté par la bobine réceptrice et qui est sollicité pour venir se loger dans une encoche ménagée dans l'élément de verrouillage.
PCT/CA1991/000394 1990-07-30 1991-11-01 Appareil pour commander le blocage des bobines d'une cassette WO1993009539A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CA1991/000394 WO1993009539A1 (fr) 1991-11-01 1991-11-01 Appareil pour commander le blocage des bobines d'une cassette
US07/817,279 US5228637A (en) 1990-07-30 1992-01-03 Cassette reel lock control apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA1991/000394 WO1993009539A1 (fr) 1991-11-01 1991-11-01 Appareil pour commander le blocage des bobines d'une cassette

Publications (1)

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WO1993009539A1 true WO1993009539A1 (fr) 1993-05-13

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0054505A1 (fr) * 1980-12-12 1982-06-23 CHECK VIEW SYSTEM société Anonyme Dispositif de comptage du nombre de passages pour la lecture d'une cassette à rubans ou films, supports de sons et/ou d'images ou autres signaux, et/ou de blocage au-delà d'un nombre de passages déterminés au préalable
WO1984001657A1 (fr) * 1982-10-22 1984-04-26 Mickey Behrendtz Dispositif pour une cassette video destinee a la location
EP0120611A2 (fr) * 1983-03-02 1984-10-03 ARENA RECREATIONS (TORONTO) LIMITED and WILLIAM LAWRENCE HEISEY, a partnership trading as SINGLE PLAY VIDEO Cassette à bande avec dispositif d'embrayage
EP0266983A2 (fr) * 1986-10-31 1988-05-11 David H. Rubenstein Système de cassette à bande à lecture limitée
US4874143A (en) * 1988-06-09 1989-10-17 Arena Recreations (Toronto) Limited Tape cassette having rewind control mechanism
EP0339916A1 (fr) * 1988-04-26 1989-11-02 Shapecourt Limited Cassettes à bande vidéo ou à autre bande ou film
EP0396234A2 (fr) * 1989-05-01 1990-11-07 ARENA RECREATIONS (TORONTO) LIMITED and William Lawrence Heisey, a Partnership trading as SINGLE PLAY VIDEO Assemblage d'embrayage unidirectionnel
GB2234225A (en) * 1989-07-11 1991-01-30 Shapecourt Ltd Tape cassettes

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0054505A1 (fr) * 1980-12-12 1982-06-23 CHECK VIEW SYSTEM société Anonyme Dispositif de comptage du nombre de passages pour la lecture d'une cassette à rubans ou films, supports de sons et/ou d'images ou autres signaux, et/ou de blocage au-delà d'un nombre de passages déterminés au préalable
WO1984001657A1 (fr) * 1982-10-22 1984-04-26 Mickey Behrendtz Dispositif pour une cassette video destinee a la location
EP0120611A2 (fr) * 1983-03-02 1984-10-03 ARENA RECREATIONS (TORONTO) LIMITED and WILLIAM LAWRENCE HEISEY, a partnership trading as SINGLE PLAY VIDEO Cassette à bande avec dispositif d'embrayage
EP0266983A2 (fr) * 1986-10-31 1988-05-11 David H. Rubenstein Système de cassette à bande à lecture limitée
EP0339916A1 (fr) * 1988-04-26 1989-11-02 Shapecourt Limited Cassettes à bande vidéo ou à autre bande ou film
US4874143A (en) * 1988-06-09 1989-10-17 Arena Recreations (Toronto) Limited Tape cassette having rewind control mechanism
EP0396234A2 (fr) * 1989-05-01 1990-11-07 ARENA RECREATIONS (TORONTO) LIMITED and William Lawrence Heisey, a Partnership trading as SINGLE PLAY VIDEO Assemblage d'embrayage unidirectionnel
GB2234225A (en) * 1989-07-11 1991-01-30 Shapecourt Ltd Tape cassettes

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