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
• • 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
  • G11B15/05—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container
  • G11B15/06—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing auxiliary features on record carriers or containers, e.g. to stop machine near the end of a tape
• • 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
  • G11B23/30—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 with provision for auxiliary signals
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
  • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
  • G11B27/34—Indicating arrangements 

Definitions

• the invention relates to a magnetic tape cassette according to the preamble of patent claim 1.
• recording and playback devices which have a so-called "memory" device.
• These are devices which, for example in connection with a tape length counter or with means for applying control signals to the magnetic tape, stop the transport of the magnetic tape during rewinding at a previously set point on the magnetic tape, cf. for example, U.S. Patent 3,601,555 From US Pat. No. 3,810,246 it is known to provide one or both edges of the magnetic tape with visually recognizable markings which, for example, indicate pauses between recorded program sections and are visible through the window of the magnetic tape cassette.
• GB-PS 1 040 262 it is known from GB-PS 1 040 262 to provide the magnetic tape at certain points with permanent thickenings, for example glued-on strips, which can be sensed by means of a tape thickness measuring device, for example a roll, in order to detect the thickening of the device to switch. -.
• the present invention has for its object to provide a device for the automatic retrieval of a certain, arbitrarily selectable and relocatable position of the magnetic tape when rewinding the same, which is independent of the design of the recording and playback device used. Furthermore, the invention has the task of realizing such a device in a magnetic tape cassette in such a way that the operation of the device is simple and safe, the magnetic tape cassette corresponds to the existing standards with regard to its dimensions and operational specifications and a conventional, unchanged magnetic tape contains, and the production costs of the magnetic tape cassette ⁇ essentially correspond to those previously known and customary magnetic tape cassettes.
• the magnetic tape cassette according to the invention has the features stated in the characterizing part of patent claim 1.
• the stops can be fixedly connected to the shells, each control member being a control slide which is opened by an opening in the relevant shell has an outwardly projecting grip part and two cheeks projecting into the interior of the housing, for which the magnetic tape runs, the magnetic tape being able to be brought out of the area of the stops by actuating the control slide.
• each control element can be a either rotatably arranged in the shells • control lever or a len between the Scha ⁇ slidably disposed spool be of the two stops for the Bandklämmer, one of the outer side of the housing accessible handle portion and a guide member for the magnetic tape has opposite surface area for clamping and compressing the tape clip.
• FIG. 1 is a plan view of a magnetic tape cassette in a first embodiment
• FIG. 2 shows a plan view of the interior of the magnetic tape cassette of FIG. 1,
• FIG. 3 is a perspective view of a tape clip of the magnetic tape cassette of FIGS. 1 and 2, on a larger scale,
• FIG. 4 is a perspective view of a control slide of the magnetic tape cassette of FIGS. 1 and 2, on a larger scale, -_
• FIG. 5 shows a plan view of a part of a magnetic tape cassette in a second embodiment in an operating position which enables the magnetic tape to pass through
• FIG. 6 is a plan view corresponding to FIG. 5 in an operating position causing a tape stop
• FIG. 7 shows a plan view of a part of a magnetic tape cassette in a third embodiment in an operating position which enables the magnetic tape to pass through
• Fig. 8 is a plan view accordingly. 7 in an operating position causing a tape stop
• the housing of the present magnetic tape cassette has, in a known manner, an upper shell 1 and a lower shell 2, which are provided with side walls 3 ' and are connected to one another by means of screws 4, part of the side walls 3 has raised inner edges 3a for reinforcement.
• the two shells 1 and 2 of the housing are provided with a receptacle (not explained in more detail).
• Playback area 5 is provided, in which a magnetic tape 8 wound on two winding cores 6 and 7 is pressed against the heads (combined sound head, erasing head) of the recording and reproducing device and moved past them.
• the shells 1 and 2 are also with a Window 9 provided, which is divided by a web 9a and through which .
• the window 9 is divided into two viewing areas by the web 9a, such that in each viewing area only the outer edge of the smaller roll of the magnetic tape wound on the winding cores 6 and 7 is visible. This not only enables a simple reading of the tape supply or the magnetic tape already played on a scale 9b applied to the visible areas of the window 9, but also allows the scale 9b to be designed approximately linearly and with minute calibration.
• the present magnetic tape cassette according to FIG. 1 has a rectangular opening 12 or 13 in its upper shell 1 and, as indicated, also in the lower shell .2, through which a grip part 14 engages one below the opening 12 in Control spool 15 or 16 arranged inside the housing protrudes, only one spool 15 being shown in FIG. 1, but both spools 15, 16 are visible in different positions in FIG. 2.
• the openings 12 and 13 are located in the corner of the shell 1 or 2 near the recording or playback area 5, through which the magnetic tape moves from said area 5 to the corresponding winding core 7 or 6 during playback in the interior of the housing becomes.
• the grip part 14 does not protrude from the opening 12 or 13 beyond the height of the shell 1 or 2 in the recording and playback area 5, so that the insertion and operation of the present magnetic tape cassette in all conventional devices by the control slide of the two shells 1, 2 are in no way hindered.
• the function of the control spool is explained below.
• a rotatable guide and deflection roller 19 or 20 for the magnetic tape 8 is arranged on both sides of the recording or playback area 5 in a manner known per se.
• a further rotatable guide and deflection roller 21 or 22 for the magnetic tape 8 is arranged at a certain distance from the rollers 19, 20, from which the magnetic tape 8 reaches the corresponding tape reel 10 and 11.
• the distance between the two stops 23 and 24 in the direction of the magnetic tape is somewhat larger than the width of tape clips 25 and 26, of which one each on the magnetic tape section between the first rollers 19 and 20 and the associated tape roll 10 and 11 is attached.
• the band clips 25, 26 are shown greatly enlarged in FIG. 3. They consist of thin-walled plastic and are U-shaped in cross-section.
• the wall thickness is, for example, 0.25 mm
• the total thickness of the formed band clip is 0.8 mm
• the width is, for example, 5 mm.
• the length of the tape clip shown corresponds to the width of the magnetic tape 8. From this it can be seen that the tape clips 25, 26 can be loosely placed on the magnetic tape 8 and pushed thereon or the moving magnetic tape 8 between the two legs of the tape clip 25, 26 can be passed practically smoothly as long as the legs are not pressed together.
• the tape clips 25, 26 cannot adversely affect the tape rolls 10, 11 if the tape clips 25, 26 are wound together with the magnetic tape 8 on the winding cores 6, 7 or unwound from them.
• the width of the band clamps 25, 26 and the distances of the stops 23, 24 are coordinated with one another in such a way that the tape clips placed on the magnetic tape 8 can be brought with play between the respective stops 23 and 24, as is shown for the stops 24 and the tape clip 26 in FIG. 2.
• control slides 15, 16 already mentioned are arranged between the stops 23 and 24 and approximately diagonally with respect to the shells 1, 2 by means of the handle part 14 within the opening 12 or 13 (FIG. 1) displaceable.
• 2 shows the control slide 15 in the outer and the control slide 16 in the inner end position.
• the control slide 15 is shown with the handle part 14 cut away.
• control slide 15 is shown in perspective and greatly enlarged. It has two sliding parts 29 and 30 which rest on the inner wall of the shell 1 and between which the grip part 14 is located. It is also provided with an outer cheek 31 and an inner cheek 32. The cheeks 31, 32, between which the magnetic tape 8 is passed (FIG. 2), have rounded inner surfaces.
• the control slide 16 is of the same design as the illustrated control slide 15-
• both control slides 15, 16 are shifted towards the center of the cassette into the end position, as shown for the left control slider 16 in FIG. 2.
• the moved magnetic tape 8 slides over the stops 24. If, when the magnetic tape 8 moves in the direction from the tape reel 11 to the tape reel 10, the tape clip 26 located on the tape reel 11 passes over the roller 22 to the stops 24, it becomes from held captive by the two stops 24,
• the tape clip 16 remains in this caught position as long as the control slide 16 is in the inwardly displaced position. Since the magnetic tape 8 is loosely guided in the tape clip 26, it can be practically uninhibited in the playback or Forward direction or the return direction can be moved.
• control slide 15 when it is in the inwardly displaced position.
• its inner cheek 32 lifts the magnetic tape 8 and thus also the attached tape clip 2 from the stops 23.
• the magnetic tape 8 is now moved in the direction from the tape reel 10 to the tape reel 11 (return)
• the tape clip 25 arrives in the position shown in FIG. 2, in which it lies between the roller 19 of the front side wall 3 and a housing cam 35 for the screw fastening of the shell 1 (FIG. 1) is clamped. On the one hand, this prevents further transport of the tape clip 25 into the recording or playback area 5.
• the legs of the band clamp 25 are pressed together by the clamping action, so that the magnetic tape 8 is immediately clamped and stopped by the legs of the band clamp 25, since with increasing friction the tensile force exerted by the magnetic band on the band clamp increases and this in turn causes it the band clamp clamped more between the roller 19 and the side wall 3 and presses with its legs on the magnetic tape. As with the tape stop at the end of the magnetic tape 8, this therefore comes to an immediate standstill, which means that at least some of the conventional devices the transport mechanism for the magnetic tape 8 is switched off.
• the band clamp 25 rests with one end on one side on the roller 19 and with the same end on the other side on the lower side wall 3, while it has the other end abuts the housing cam 35 on its last-mentioned side.
• a tilting clamping is achieved, which can be released immediately in the opposite direction by means of a very slight strip tension, without the strip clip 25 becoming stuck in the position shown. Rather, it is drawn when a new supply of Magnet ⁇ belt 8 via the rollers 19 and 21 wound on 'the intervertebral winding 10th
• the magnetic tape 8 returns, it then returns to the position shown in FIG. 2 between the roller 19, the side wall 3 and the housing cam 35 and stops the magnetic tape 8, the position of the tape clip 25 with respect to the magnetic tape 8 did not change, or at most changed only slightly, according to Schlupes.
• Track of the magnetic tape a position preselected by means of the control slide 16 can be found automatically. Furthermore, it is possible to control the movement of the magnetic tape in the forward direction accordingly, with the same, not reversed position of the cassette in the device, i.e. to let the magnetic tape advance to a certain point at which the movement is automatically stopped. For this purpose, the other control slide 16 is shifted from its normal inner position into the outer position at the selected point.
• autoreverse an automatic and repeated playback of both tracks of the magnetic tape between any two positions can be achieved in this way.
• control slides 15 and 16 such that each can be actuated from both sides of the cassette or at the front end of the cassette.
• a film 40 is placed in a manner known per se between each of the shells 1, 2 of the housing and the adjacent tape windings 10, 11.
• the film 40 which is made of transparent PVC, for example, has a reduced width compared to known films and extends in the width direction only over the winding cores 6 and 7.
• the film 40 has radial elevations 42, for example folds, with respect to the round cutouts 41, and provided with more longitudinally extending elevations 43, which cause the film 40 to press resiliently along these elevations onto the winding cores 6, 7 and the tape windings 10, 11.
• the longitudinal ridges 43 to prevent in this case serve the running onto the tape winding 10, 11 Magnet ⁇ ribbon 8 is always in the center of the winding cores 6, to keep 7 and the so-called. "Tower formation" to the tape winding ".
• the radial ridges 42 which act essentially only on the winding cores 6, 7 and the innermost part of the band windings 10, 11, keep the winding cores 6, 7 in the middle between the shells 1, 2.
• the elevations 42 act only on the innermost part of the band windings 10, 11, in order to achieve a sufficiently large frictional force even with a small tape reel, which slows down the outgoing tape reel when a rapid tape run is stopped.
• FIG. 2 an inserted into the shell 2- endless belt 36 is shown, which is guided around two pins 37, 38 and is an ⁇ with 'corresponding stiffness at the tape winding 10 and 11.
• the band 36 for example made of paper or plastic, has three different functions: First. it grinds on the outer sides of the tape rolls 10, 11, is set in motion by them and thus cleans the magnetic layer of the magnetic tape 8. Second, the tape exerts a braking moment on the tape rolls 10, 11. Thirdly, the band 36 enables better recognition of the outer edge of the respectively smaller band reel 10, 11 through the one of the two viewing areas of the window 9 in FIG. 1.
• the braking effect of the band 36 on the band reel 10, 11 is greatest when one band reel is smaller than the other. Then the tape 36 is moved by the larger tape reel in the opposite direction to the direction of movement of the smaller tape reel, so that the braking effect on the smaller tape reel increases.
• This not only prevents the tape roll from running out when the magnetic tape 8 is stopped, but also has a compensating effect on the tape tension when the tape is being played: the winding core is braked when the tape winding is small, when the train is large, while the winding core is braked when the tape winding is small, if the train is small, it is driven in the opposite direction.
• 5 and 6 show a further embodiment of the device for effecting a tape stop at any point along the magnetic tape.
• 5 and 6 show a section containing the lower right corner of the housing of the magnetic tape cassette of FIG. 2 with the further embodiment on a larger scale. Accordingly, the side walls 3 are visible from the lower shell 2 of the housing, as well as the two rotatable guide and deflecting rollers 19, 21, via which the magnetic tape 8 reaches one of the two tape windings, not shown here.
• a lever 56 is disposed, the two lever parts having 57 and 58 and is rotatable on a pin 59 • elagert.
• the pin 59 also serves as a housing cam for the screw fastening of the other shell on the shell 2, corresponding to the housing cam 35 in FIG. 2.
• the lever part 57 is provided with gripping teeth 60 which lie in a cut-out area of the two side walls 3 and are therefore accessible from the outside for turning the lever 56.
• the lever part also has two projections 61 and 62 or a corresponding recess.
• the lever part 57 merges into the lever part 58 via a plate-shaped connecting piece 63.
• the latter is provided at its end with pins 64 which lie in slots 65 of the lower shell 2 and also of the upper shell, not shown. By means of this pin 64, which on the Outside of the two shells are accessible, the lift 56 can also be rotated.
• the magnetic tape 8 runs over the two projections 61, 62 of the lever part 57 and through a gap between the guide roller 19 and a surface 57 'of the lever part 57 Magnetic tape 8, ie when the magnetic tape 8 moves from the guide roller 21 to the guide roller 19, the attached tape clip 25 from the tape reel (not shown) to the lever part 57, it is locked by the projection 61 acting as a stop. Since the tape clip 25 lies loosely on the magnetic tape 8, the magnetic tape 8 continues to run practically uninhibited. In the opposite ' running direction of the magnetic tape 8, the tape clip 25 is held by the other projection 62 of the lever part 57 without inhibiting the running of the magnetic tape 8.
• the projections 61 and 62 are removed from the path of the magnetic tape 8. If the magnetic tape 8 is now moved in the forward direction from the roll 19 to the roll 21 and the subsequent tape reel, for example when playing back a recording, the tape clip 25 is no longer held by the projection 62, but moves with the magnetic tape 8 to the relevant tape wrap. During a subsequent rewinding of the magnetic tape 8, the tape clip 25 arrives at a certain point in time in the same position with respect to the magnetic tape to the guide roller 21 (FIG. 6) and then into the area between the rollers 21 and 19.
• the tape clip 25 strikes the Roller 19 and on the surface 57 'and is pressed together due to the narrowing respective surface parts, so that the magnetic tape 8 is clamped and stopped by the legs of the tape clip 25, as has already been described with reference to FIG. 2.
• the return of the magnetic tape 8 thus ends at the point at which the projections 61, 62 have been removed from the path of the magnetic tape 8 by turning the lever 56. In other words, a desired starting point of a magnetic tape section has been found on the return without further action.
• the tape clip 25 When the magnetic tape 8 runs forward again, the tape clip 25 easily releases from the guide roller 19 and the surface 5 / 'of the lever part 57, so that the tape clip 25 maintains its position with respect to the magnetic tape 8 as long as the lever 56 is in the position 6 remains.
• the other lower corner of the cassette housing according to FIG. 2 is also provided with the same lever 56, so that a controlled tape stop can be achieved even when the cassette is not rotated or in the forward direction of the magnetic tape.
• FIGS. 7 and 8 Embodiment of the device for effecting a tape stop at any point along the magnetic tape is shown in FIGS. 7 and 8, and in fact in the same partial view of the magnetic tape cassette as in FIGS. 5 and 6. Accordingly, from the bottom Shell 2 of the housing, the side walls 3 visible, and the one guide and deflection roller 21, which is the only rotatable roller on the illustrated side of the magnetic tape cassette. A further guidance and slight deflection of the magnetic tape 8 is provided by a rounded edge 71 of an inwardly projecting molded on the lower shell 2 of the housing
• OMPI Rib 72 causes.
• the lower side wall 3 On the opposite side with respect to the magnetic tape 8 and displaced from the edge 72 by a small distance in the direction of the roller 21, the lower side wall 3 is provided with a rounded projection 73.
• the edge 71 and the projection 73 thus form a gap through which the magnetic tape 8 runs.
• a slide 74 is arranged in the space between the rib 72 and the roller 21 and is also shown in side view in FIG. 9 from the lower side in FIGS. 7, 8 and on a larger scale. Accordingly, the slide 74 has a central part 75 and a cylindrical pin 76 or 77 on both sides.
• the middle part 75 lies between the inner surfaces of the lower shell 2 and the upper shell of the housing, not shown in FIGS. 7, 8.
• the pins 76, 77 are each mounted in a slot of the two shells, only the slot 78 of the lower shell 2 being visible from FIGS.
• the slide 74 is both slidable along the slots 78 and rotatable about the longitudinal axis of the pins 76, 77.
• the shell 2 has a further integrally formed rib 79 which, together with the rib 72, guides or limits movement of the slide 74.
• magnetic tape 8 facing side of the slider 74 is provided with a recess 80 which is bounded by two projections 81, 82 and substantially the recess with the projections 61, 62 of the lever part 57 of Fig. 5, 6 corresponds.
• One projection 81 is continued as a rib-shaped projection 83 around the adjacent corner and the adjoining side of the slide 74.
• the pins 76, 77 are each provided with a blind hole 84 or 85, which makes it possible to slide the slide 74 with the aid of a pointed counter Stand, for example a pencil, to be moved from the outside in the slots 78.
• a further rounded projection 86 is formed on the lower side wall 3 opposite the recess 80 of the slider 74, the function of which will be explained below.
• the magnetic tape 8 is provided with a loosely attached tape clip 25, which is shown in more detail in FIG. 3. It is assumed that the band clamp 25 is initially located on the band wrap associated with the roll 21 and not shown in FIGS. 7, 8. When the magnetic tape 8 is indicated by an arrow 87 and the slide 74 is in the position shown in FIG. 7, the tape clip 25 passes through the projection 82 into the recess 80 of the slide 74 and is held in the recess 80 by the other projection 81 . However, the magnetic tape 8 can move practically unhindered since the tape clip 25 is loosely seated on the magnetic tape 8.
• the tape clip 25 in the recess 80 is taken a very short distance until it is held in place by the projection 82 of the slide 74, which position ' in FIG. 7 is shown in dashed lines.
• the magnetic tape 8 because of the loose fit of the Bandklam mer 25 continue to move.
• the rounded projection 86 of the lower side wall 3 limits lateral movement of the tape clip 25.
• the tape clip 25 Since only the front edge of the tape clip 25 is pressed together and clamped, when the magnetic tape 8 subsequently runs in the forward direction, the tape clip 25 immediately releases from the mentioned constriction and is taken again by the magnetic tape to the roll 21 and to the associated tape roll. The tape stop can thus be effected several times at the same point on the magnetic tape by rewinding again. If the band stop is to be released, then only the slide 74 is to be brought into the position according to FIG. 7.
• the embodiment according to FIGS. 7 to 9 has the advantage of great simplicity and lower requirements for dimensional tolerances of the parts of the housing and the slide which cause the band clamp 25 to be clamped.
• the 1, 2 measures (foils, brake band) or other measures are provided.
• a thin brake strip for example an aluminum strip, as follows : The strip is placed flat on the inner surface of the lower shell 2 and extends along the rib 72 from the slider 54 to and below the band concerned, the rib 79 being provided with an opening for the strip fen.
• the slide In the area of the slide 54, the slide has a tab which is angled upwards by an angle different from 90. If the slider 54 is now brought into the position according to FIG. 8, the slider presses * this tab, so that the strip endeavors to stand up along one of its longitudinal edges. The other longitudinal edge of the strip thus presses on the tape wrap and brakes it.

Landscapes

• Unwinding Webs (AREA)
• Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
• Magnetic Record Carriers (AREA)
• Recording Or Reproducing By Magnetic Means (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4324126

Family Applications (1)

Country Status (9)

Cited By (3)

Families Citing this family (6)

Citations (5)

Family Cites Families (2)

• 1979
  • 1979-08-10 CH CH737479A patent/CH646266A5/de not_active IP Right Cessation
• 1980
  • 1980-08-06 FR FR8017918A patent/FR2463481A1/fr active Granted
  • 1980-08-07 GB GB8111219A patent/GB2070568B/en not_active Expired
  • 1980-08-07 US US06/253,507 patent/US4405096A/en not_active Expired - Fee Related
  • 1980-08-07 DE DE80CH8000095T patent/DE3049750D2/de not_active Expired
  • 1980-08-07 HU HU80920A patent/HU181305B/hu unknown
  • 1980-08-07 JP JP50175480A patent/JPS56501107A/ja active Pending
  • 1980-08-07 WO PCT/CH1980/000095 patent/WO1981000480A1/de not_active Ceased
• 1981
  • 1981-04-09 SE SE8102298A patent/SE422852B/sv not_active IP Right Cessation

Patent Citations (5)

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