DE2364397A1 - MAGNETIC TAPE DEVICE WITH MAGNETIC TAPE CASSETTE - Google Patents

Description

BASF. Hostage :! shaft

Our sign; O.Z. 30 287. De / L 67OO Ludwigshafen / December 20, 1973

Magnetic tape recorder with magnetic tape cassette

The invention relates to a magnetic tape device with a magnetic tape cassette, the latter consists of a cassette housing with base, cover and side walls, the one wound on a roll core Enclose reel of magnetic tape, after being engaged of the cassette with a receiving device on the device side, the tape roll is in one position or can be transferred into one position is, in which the peripheral surface of the tape roll with a device-side Drive or scanning member is in contact.

A tape transport device with a tape cassette of this type is already known from German Offenlegungsschrift 1 955 5 ^ 0. In it, the cassette has a circular shape and an open, non-closable side opening for the entry of a Drive roller in the cassette to drive one located therein Supply reel and for leading out the tape. The supply reel can be rotated by means of pins in openings in the circular walls of the cassette, but cannot be displaced. The movement the spool with decreasing winding diameter in the direction of the drive roller takes place by guided displacement of the whole Cassette by means of a guide pin on the lower circular wall the cassette and a cooperating guide groove in the device deck as well as by means of encompassing the cassette laterally Guide bars.

In all embodiments of these known tape transport devices spring-loaded displacement elements attack the outside of the cassette housing and thus press the tape reel only indirectly to the drive roller. As a primitive bearing means, the tape reel has the bearing journals mentioned above, which are inserted into openings engage in the circular walls of the cassette. Essential

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Disadvantages of the tape transport device with cassette described are that

a) the tape and the tape reel as a whole in the cassette is not adequately protected against external influences,

b), an economical production of the cassette, e.g. from plastic material, especially with regard to a high speed of rotation of the spool in the cassette because of the primitive trained storage means for the coil is not feasible, ■

c) an almost frictionless guidance of the cassette on the transport device can only be realized with great effort,

d) not inserting the cassette between the guide webs is possible without confusion,

e) the drive roller enters the cassette and consequently opens the cassette and dimensions of the drive roller must be closely coordinated,

f) easy handling due to the circular shape of the cassette and archiving the same for home use is made more difficult,

g) Due to the movable mounting of the cassette from the device side, an extremely high expenditure on operating devices is required, which makes operation difficult,

The present invention is based on the object of the known To improve magnetic tape devices with cassettes, more functional, easier to handle and archive as well as economical to be able to be produced in large numbers "

Task,

According to the present invention, the / with a magnetic tape recorder with magnetic tape cassette, the latter consisting of a cassette housing with base, cover and side walls, the one Enclose a roll of magnetic tape wound on a roll core, wherein after the cassette has been brought into engagement with a device-side Pick-up device, the roll of tape is in a position or in a position can be brought into which the circumferential surface of the tape roll

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with a device-side drive or scanning element in contact stands, solved in that the cassette consists of two parts of approximately the same volume in terms of volume, which are connected by means of connecting devices are pivotally connected to each other in such a way that the cassette parts in the closed position of the cassette Completely enclose the tape roll and in the open position of the Cassette the cassette parts are pivoted against each other by pivoting means on the device side, whereby at least a part of the Peripheral surface to a 'drive or scanning process with device-side Drive or scanning elements is released.

Through this training of. Device and cassette will be an optimal one Safety for the reel of tape, the cassette and the device is achieved with a simple serial production possibility of the units.

After assembly, the reel of tape can be inserted into the simple cassette, which can be produced from one or more individual housing parts the cassette must be inserted, so that the risk of damage for the tape roll is greatly reduced.

As is known per se, the cassette can have openings in floor and cover walls' for the passage of a device-side rotatably and optionally displaceably mounted dome, see above that the roll of tape can be driven essentially in the interior of the cassette and, if necessary, the tape can also be scanned therein.

An advantageous design of the cassette can be achieved if spring means are provided which the cassette parts in Pre-tension the closed position of the cassette.

In detail, the spring means can consist of a near the Connecting devices der.Kassettenteile provided first spring and one in the vicinity of the locations of the cassette parts, the Describe the greatest path during the pivoting process, arranged second spring exist.

By using two springs, which are advantageous as much as possible Are to be arranged at a distance from each other, in addition to an increase in the clamping force acting in the closed position,

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Considerable stiffness of the cassette against bending and shear stress achieved.

In further practical training, the second spring consists of an element made of spring material, and the element has an opening or recess through which the tape roll in the open position the cassette can be pushed through at least partially, the element each having a cam-like projection cooperates on each cassette part in the closed position of the cassette, to keep them closed, and in the open position of the cassette the element with one more each Projection on each cassette part cooperates to limit the pivoting angle of the cassette parts.

Such a spring design with the various modes of operation described has proven to be economical and operational proved very cheap.

The cassette parts are another particularly advantageous embodiment Provided with a toothing in the area of their separation point, through which the stiffness of the cassette in its closed position is increased.

With this measure, a very good stiffness of the cassette is achieved, especially against bending forces, whereby one already through corresponding spring design and arrangement achieved rigidity is increased.

In a practical design of such a toothing, this is made up of areas that overlap or underlie each other in terms of area Formed bottom and top walls of the cassette parts.

In a further advantageous embodiment of the cassette, spring members are provided therein, in particular in the closed position of the cassette are in contact with at least a portion of the circumferential surface of the roll of tape to hold the roll of tape together. This effectively prevents unintentional unwinding of the tape or a threading tape from the tape roll.

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The spring members exist in a practically very simple embodiment made of spring strips, which are held between projections in the cassette parts. ■ ·

According to the invention, the device for the cassette described above is provided with a support device which essentially from a divisible support bar or a divisible support wall and actuating members, the actuating members engaging the cassette parts at predetermined locations and the parts of the support web or the support wall with the cassette parts can be pivoted apart via a pivot mechanism are.

By described. Support device that is easy to manufacture and is functionally reliable, a problem-free opening of the cassette within the device is ensured, so that damage of tape and tape roll must be avoided.

Further details of an embodiment of the invention are described below and shown in the drawing.

The drawing shows in

Figure 1 shows a receiving device for a shown before putting on Cassette according to the invention,

FIG. 2 shows a sectional view according to section line H-II through a cassette according to the invention in FIG. 3 *

Figure 3 shows a cassette according to the invention in the closed position one device,

FIG. 4 the cassette according to FIG. 3 in the open position with the drive on one device,. '

Figure 5 shows a closing spring of the cassette,

FIG. 6 shows a detail view of the toothing of the cassette parts and .

FIG. 7 shows a roll of tape with a threading tape for one according to the invention Cassette.

Figure 1 shows a receiving device or better a simple one Loading mechanism for a cassette 2. If the device flap is opened, it releases a device recess j5 into which the cassette inserted manually in the closed state (closed position)

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will. The device recess J is in two parts and is preferably made of stamped and bent sheet metal. The two parts Ja and Jb can be rotated about an axis 4 independently of one another. The two device trough parts Ja and Jb are directly connected to the device flap 1 via drive rods 5 * which are pivotably connected to the brackets β and to the device flap at points 7. If the device flap 1 is open, the device recess J is closed and ready to receive the cassette. If the device flap 1 is closed in the direction of the arrow a, both trough parts Ja and Jb pivot in opposite directions in the direction of the arrows b by a certain angle. The swiveling of the recess parts Ja and Jb takes place by moving the rods in the direction of the arrows c. The pivot axis 4 for the trough parts coincides with the axis of rotation 8 of the cassette when the cassette is inserted. The opening angle of the trough parts corresponds to the opening angle of the cassette. When the device recess J is swiveled out, holding means 9 encompass the respective recesses Ja and Jb and cassette sides at a defined height so that the tape roll (Pig. 7) can be wound up and unwound without coming into contact with cassette housing parts.

The insertion of the cassette 2 into the device recess J takes place with the cassette front 17 in front at an angle from above. The cassette front is thereby 2a pushed under the protruding trough front 10. At the same time, the lugs 11 grip right and left into cassette front openings and steer the Pront spring in the cassette like this far to the rear that the cassette is ready to be opened when it is fully pressed into the recess. So that the cassette doesn't inserted incorrectly, e.g. upside down, the cassette has 2 a recess 12 on one side and the device recess on the corresponding side a projection IJ. When inserting of the cassette 2, the pressure ball mechanism 16 is attached to the core holder 1 4 actuated and the core 15 pressed onto the conical surface of the core holder 14. As a result, the tape roll 18 is ready for use connected to the device. The spring-loaded lever 19 provides additional security that the cassette housing 2 is inserted State has reached its end position. The device can be operated with the lever 19 by means of a switching mechanism (not shown) be locked so that it cannot be operated until the cassette 2 is properly positioned.

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Other constructions of a loading mechanism for the cassette to be described in detail are conceivable. The cassette 2 is a so-called single-hole cassette. According to FIG. 7, the magnetic tape is wound onto a core 15, preferably made of aluminum, as a tape roll 18. At the outer edge the tape roll 18 carries a threading leader tape 20 which is held by means of side teeth on the tape edges of the outer tape layers so that the tape roll 18 is held together and the outer tape layers cannot fall off. In the closed position of the cassette 2 (FIG. 3), the core 15 is held between the top and bottom walls 21 and 22 of the cassette 2 by means of suitable ribs, not shown, so that the position of the core 15 largely prevents displacement and rotation during movement of the cassette is secured. An additional anti-rotation device for the tape reel 18 is conceivable by means of toothed elements, likewise not shown, on the underside of the core 15, which engage in corresponding depressions or between projections on the cassette base 22. The cassette 2 consists of two cassette parts 23 and 24 of the same size, which are pivotably connected to one another via a connecting device, for example a joint 26. In an advantageous embodiment, the cassette parts 23 and 24 each consist of two simple plastic injection-molded parts, which are connected to one another in a suitable manner, for example by ultrasonic welding or screwing. The cassette parts 23 and 24 completely enclose the tape roll 18 in the closed position of the cassette 2, so that there is no direct access to the tape at any point. As a result, the tape roll l8 is optimally protected against mechanical stresses and dust. At the point of separation of the two cassette parts 23 and 24, a toothing producing areas 25 engage the base and cover surfaces 22 or above and below one another (see arrows d in Fig. 6), whereby the mechanical strength of the cassette 2 in the parting plane, the dust tightness and the security against mechanical damage to the tape and the tape roll 18 can be increased in an advantageous manner. The toothing can also be produced in other ways, for example by tongue and groove connections. As an additional safeguard against bending of the cassette 2 in the parting plane, first and second springs are provided. The first

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Spring 27 is referred to as a closing spring and is arranged in the vicinity of the joint 26. It can be designed as a leaf spring and its ends can be held in suitable grooves 28 in each of the two cassette parts 23 and 24. The illustrated arrangement and shape of the spring 27 makes it clear that a force compressing the toothing 25 is exerted on both cassette parts 23 and 24. The second spring 29 is referred to below as a front spring; an embodiment is shown in FIG. In the closed position of the cassette 2, the spring 29 is suspended between the wedge-shaped locking projections j50, the projections j50 engaging in an opening 32 of the spring in the vicinity of the edges 51. The wedge-shaped 'tapered projections JO pointing to the outer cassette side walls 33 effect a simple compensation of length tolerances occurring during the manufacture of the front springs 29. The size of the rectangular opening J> 2. The spring 29 is dimensioned so that the tape roll 18 can pass at least partially through the opening ^ 2 without the tape layers or the leader being touched. The spring 29 is slightly curved in the rest position, so that the spring 29 is supported on the inside of the front I7 and thus a further holding force is exerted on the toothing 25 in the closed position of the cassette 2. In order to bring the cassette 2 into their open position, occur figure 1 described tabs 11 through the front openings or slots JJ4 to the ends of the spring 29 so that it is flexed, and is thus lifted from the Vorsp'rüngen J> 0th If the described pivoting process of the cassette parts 23 and 24 now takes place, smaller limiting projections 35 hook onto the edges 3I of the spring 29 *, whereby the pivoting angle is limited. The wedge-shaped design of the projections allows the spring 29, which is provided with angled ends, to slide freely.

As can be seen in Figure 2, springs 27 and 29 are over their entire length in the interior of the cassette 2, guided so closely, that even a slight bending of the cassette about the separation axis of the cassette parts 23 and 24 causes the springs 27 and 29 can come to rest on the inside of the bottom and top wall, so that a further bending a sufficiently large Moment of resistance is opposed.

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The spring 29 can also be suitably designed in another embodiment, for example as a wire rectangle. It is also not necessary that an opening is provided in the spring 29 / a corresponding recess is sufficient so that a U-shape is created. When assembling the cassette 2, the spring can simply be inserted into the otherwise complete Xassette 2 afterwards will. It is also possible to remove the spring 29 again using special tools, e.g. to replace the Replace tape roll l8 or carry out repairs on the cassette. .

To compensate for different winding diameters due to fluctuations in tape thickness or different tape lengths (e.g. with recorded cassettes), a spring 36 (preferably made of plastic, e.g. polyester) can be inserted into each housing half, depending on the winding diameter, at different points between projections yj in each of the cassette parts 2j5 and 24. In the closed position of the cassette 2, the circumference of the tape roll always rests against these springs J> 6 . This securely holds the tape roll 18 together and prevents the leader 20 from becoming detached.

An advantageous embodiment of such retaining springs can also thereby can be achieved when flange edges on the springs overlap the tape roll above and below (not shown). As is apparent from Figure 4, the springs 36 are no longer with the Roll circumference in contact when the cassette is in its open position.

Comparing the position of the tape roll 18 in Figures J> and 4 ,, so in the latter representation, the roll l8 is already pushed out of the angular opening 38 of the cassette 2 and is in contact position on the circumference of a device-side drive roller 59 shown schematically as a semicircle, the forms the drive element for two tape reels in a magnetic tape device operating on the contact winding principle. In such a magnetic tape device, in order to maintain sufficient pressure between the drive roller, hereinafter referred to as the "capstan", and the tape rollers, it is necessary that the rollers move with decreasing and increasing roller diameters

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«40,

move towards the capstan - or dayon away. In such a The device is expediently the device-side shafts carrying the tape rolls, radially to or from the capstan circumference Spring means mounted displaceably.

The shaft 40 receiving the roll core 15 is described in FIG Mounted displaceably along the central axis 41 in the direction of the drive roller 39. The role core 15 is thus in Sector between the cassette parts 23 and 24 by means of the shaft 40 postponed. The tape roll 18 is a full roll from which, how the front part of the prestressing tape 20 shown in FIG. 7 is peeled off by means of a blade-shaped scraper 42. The prestressing band 20 is then guided around the capstan 39 via guide means (not shown) and on a roll core attached to a take-up reel, and the magnetic tape is in this way from the supply reel 18 to the not shown Take-up roll. The leader tape 20 is made of plastic sheet material of generally greater thickness than that of the magnetic tape and is attached thereto by known means. The construction of the cassette 2 is ensures that the pretensioning tape 20 cannot become detached from the roll circumference within the cassette 2, in particular with The help of the springs 36, by which the coils of the roll are held together. The distance between the roll circumference and the inner cassette wall is expediently set so that the pretensioning tape remains in contact with the roller circumference. The rest of them too Gaps between the roller and the cassette parts are dimensioned and designed so that even if the device is rotated improperly the reel in the opposite direction, the leader tape does not get caught or peeled off even if the tip of the leader tape is lightly protrudes from the circumference of the roll.

A detachment of the leader tape 20 before the threading process in The device would give rise to malfunctions in the predominantly automatic mode Belt transport. After the magnetic tape has been unwound, the empty roll core 15 rests against the circumference of the capstan. Afterward the magnetic tape can be transported back from the previous take-up roll to the roll core 15 of the cassette 2 until the full belt roll opening is reached again.

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The particularly important advantages of the cassette and the device according to the invention are in consideration of the exemplary embodiment described in that the cassette construction, the tape roll before inserting the cassette in the device in front of all external influences such as dust, dirt and mechanical damage is safely protected, the cassette can be handled reliably, largely automatically after being inserted into the device with the greatest possible protection of the cassette and the "device from faulty Operation, and the cassette and after the cassette construction trained device parts can be easily and economically produced in series production. Another important one The advantage over the prior art is that the cassette is firmly locked on the device and only the tape roll needs to be moved. This creates an otherwise necessary number of additional operating devices saved, and the operation itself can be carried out easily. ..

Regardless of the exemplary embodiment described, the

ν.

written cassette also without openings 43, 44 for entry a dome or a shaft can be realized. It is also not necessary that the width of the magnetic tape be less than that Roll diameter is.

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Claims (1)

- 12 - O.Z. 50 287 Claims / 1 Υ / Magnetic tape recorder with a magnetic tape cassette, the latter consisting of a cassette housing with a base, cover and side walls that contain a magnetic tape wound on a roll core. enclose tape roll, wherein after the cassette has been brought into engagement with a device-side receiving device, the tape roll 'is or can be brought into a position in which the peripheral surface of the tape roll is in contact with a device-side drive or scanning element, characterized in that the Cassette (2) consists of two parts (25, 24) of approximately the same size in terms of volume, which are pivotally connected to one another by means of connection devices (26) in such a way that the cassette parts (25/24) in the closed position of the cassette (2) the tape roll ( l8) completely encompassed and in the open position of the cassette (2) the cash register parts (25, 24) are pivoted against each other by pivoting means (1, 5, 6, 5a, 5b) on the device side, whereby at least part of the circumferential surface of the tape roll (l8) is released for a drive or scanning process with device-side .Antriebs- or scanning elements (59). 2) Cassette according to claim 1, characterized by openings (45, 44) in the bottom and cover walls (22, 21) of the cassette (2) and in the tape roll (l8) for the passage of a device-side rotatable and possibly displaceable mandrel (40) . 5) cassette according to claim 1, characterized by spring means (27, 29) which bias the cassette parts' (25, 24) in the closed position. 4) Cassette according to claim 5, characterized in that the spring means consists of a first spring (27) provided in the vicinity of the connecting devices (26) of the cassette parts (25, 24) and one in the vicinity of the locations of the cassette parts (25, 24) ), which describe the greatest path during the pivoting process, there are arranged second spring (29). 5) cassette according to claim 4, characterized in that the second spring (29) consists of an element made of spring material 509827/039 6 -15- - 13 - O. Z. 30 287 stands and the element has an opening or recess (32), through which the tape roll (l8) can at least partially be pushed in the open position of the cassette (2), wherein the element each with a cam-like projection (30) cooperates on each cassette part (23, 24) in the closed position of the cassette (2) in order to keep it closed and in the open position of the cassette (2) the element with a further projection (35) on each cassette part (23 * 24) cooperates to limit the pivoting angle of the cassette parts (23, 24). 6) Cassette according to one or more of claims 1 to 5 *, characterized in that the cassette parts (23 * 24) are each provided with a toothing (25) in the region of their separation point, through which the rigidity of the cassette (2) in its closed position is increased. 7) Cassette according to claim 6, characterized in that the toothing is formed from areas (25) of the base and cover walls (22, 21) of the cassette parts (23, 24) which overlap in terms of area. 8) Cassette according to one or more of claims 1 to 7 *, characterized in that spring members (36) are provided in the cassette (2), which in particular in the closed position of the cassette (2) with at least part of the circumferential surface of the tape roll (l8 ) are in contact in order to hold the roll of tape (l8). 9) Cassette according to claim 8, characterized in that the spring members consist of spring strips (36) which are held between projections (37) on the cassette parts (23, 24). 10) Cassette according to claim 9, characterized in that the projections (37) are arranged on the cassette parts (23, 24) in such a way that the spring strips (36) for tape rolls with different diameters in different positions. can be used. -14- 50 9 8 27/0396 - 14 - 0..Z. 50 2δ7 11) Device for the cassette according to one or more of claims 1 to 9i, characterized in that a support device is provided which consists essentially of a divisible support web or a divisible support wall (5) and actuators (.11), the actuators to ^- The cassette parts (25 * 24) engage in predetermined locations and the parts (5a 'and 5b) of the support web or the support wall (5) with the cassette parts (25, 24) can be pivoted apart via a pivot mechanism (1, 5, 6). Sign. BASF Aktiengesellschaft 50 9 827/0396 Blank page