DE3418184A1 - PORTABLE DICTATOR - Google Patents

Description

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3418184 PATENT AGENCIES

european patent attorneys

Dipl.-Ing. H. Leinweber (1930-76) Dipl.-Ing. Heinz Zimmermann Dipl.-Ing. A. Gf. ν. Wengersky Dipl.-Phys. Dr. Jürgen Kraus

Roeental 7, D-8000 Munich 2 2. Ascent (Kustermann-Passage) Telephone (089) 2 60 39 89 Telex 52 8191 lepatd Telegr.-Adr. Leinpat Munich

^the 1 ß. MA11984

UrwerZelch.n DIC-501 krp

Dictaphone Corporation
Old Post Road, Rye, NY 10580 (United States)

Portable voice recorder

The invention relates generally to the field of office dictation equipment and, more particularly, to a drive mechanism for a miniaturized, portable, hand-held voice recorder.

Office dictation facilities have been in widespread use for well over half a century, and so is it are in most offices where various forms of information are dictated to some appreciable extent

are converted into script and have to be written with a typewriter, various Find types of office dictation facilities. Although the dictation facilities in the course Having seen numerous changes over the years, the point of view remains pretty much the same such facilities as the size and layout of the facility and the manner in which they would normally be used is maintained for use in the offices. Typically it is a dictation machine by a unit on the order of 8 to 10 inches square and 3 to 4 inches in height, which stands on the desk or a counter in a position that is comfortable to the seat of the user, so that he can hold a suitable microphone near his mouth, the microphone with the dictation machine connected by a lead wire. Find to record the user's voice various media application, including cylinders and plates, in the similar to a conventional one

™ record recording a groove is cut, or a wide plastic sleeve with a groove cut into it, a wide magnetic sleeve, on which the user's voice is recorded by means of a magnetic track, and more recently a magnetic tape being fed from a supply reel to a take-up reel, as is done in the art tape recording is well known, or that is stored in cartridges associated with portable cassette recorders and players

have become widely known.

Over the past few years there has been quite a remarkable development in dictation equipment Change occurred, resulting from the 35

Miniaturization of both the electronic grain

components that are usually part of modern dictation equipment, as well as in connection tape cartridges used with it. Both the technicians and the merchants in the field of Dictation equipment has realized that it would be most desirable if an entire dictation machine Could be reduced to the size that has long been just the size of a microphone unit typical desktop dictation machine. It has also been recognized that the advantages of such a dictation machine would be very important in the fact that the user of the dictation machine is no longer on the area his desk or another place where the voice recorder is normally available, would be limited, and would not be exposed to the inconvenience, a comparatively serious and moving bulky equipment when he wanted to use the dictation machine in a different location from his normal place of operation. As a result, A multitude of miniaturized hand-held dictation machines soon appeared on the market, which, while in detail, differ in terms of their appearance, their operation and their functions all had one thing in common, namely that they were small enough to last during the Can be conveniently held in one hand during operation. These dictation machines showed an average Size of approximately 6 inches long χ 3 inches wide χ 1 inch high, were battery operated and suitable recorded and included the user's voice on magnetic tape stored in a cassette sufficient independent components to allow instant rewind and playback the recording on the tape. As is well known to anyone who has this species

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of product has investigated, the market for portable hand-held voice recorders is enormous Experienced growth and success, and there are many larger domestic and foreign electronics and office equipment manufacturers in the production and marketing of this product in competition with one another.

As is the case with many other fields of electronic products, modern

ig technical developments on electronic miniature components facilitates the design and development of increasingly smaller dictation machines. The development of miniature microphones, miniature transducers for recording on and playback of the magnetic tape, various electronic components that are in any Type of sound recording or playback device used and of miniature speakers have overall significant to the technology of miniaturization of Voice recorders contributed. One major difficulty which was encountered in connection with the construction of small dictation machines and which turned out to be very Has proven difficult to solve, consists in the miniaturization of the mechanical components required for this , the recording medium to the transducer, sometimes referred to as a recording / reproducing head is going to move past. Given that the earlier forms of recording media, viz Plates, or wide sleeves, were not suitable for miniaturization until development the magnetic tape cassette, a miniaturization of dictation machines was considered. However, there is magnetic tape has been developed in cassette form, in which the tape is extremely thin, on the order of 9μιη and being relatively narrow, on the order of 2mm, the development of dictation machines was made possible at where a cassette is used that is not much larger than an anniversary postage stamp and on which a note

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drawing time of no less than 30 minutes is possible is. However, those are for driving the tape from the cartridge to a recording or reproducing position and mechanical components back into the cartridge are required for a number of reasons extremely difficult to miniaturize. One of these reasons is that to the extent that the mechanical parts are designed to be smaller, they also become weaker and cannot withstand the load, which they normally perform their intended functions in the course of operation are subject to. A second reason is the limited when designing small parts Having strength properties encountered difficulty in properly fitting one into the other and work when movements of these parts are required to a significant extent, such as it is the case in dictation machines. Still another reason is difficulty in use the limited amount of power from a battery supply to drive low-power motors is available to achieve the same overall mechanical operation that is essential for desktop dictation machines larger power sources and motors of higher power is achieved. Have these difficulties in the field of miniature dictation machines to a great extent of design and development aimed at finding solutions to these difficulties, of which the foregoing are by no means the only ones. While many of these difficulties through to a substantial extent While developments in the prior art have been resolved, some problems are not adequately resolved and some additional problems have been created by previously proposed solutions that

on the other hand, create a need for further development. So there remains a considerable one Need for further technical developments in miniaturized dictation machines, especially in connection with a need to further reduce the overall size of these devices in order to make them portable and to increase the convenience of use.

In most forms of sound recording and Playback devices using magnetic tape come in two forms of drive for movement of the tape from one reel to another past the record and playback transducer. The mechanically simpler of the two is the so-called tape reel drive, in which one of the in the cassette located tape take-up reels is driven such that the tape is wound onto the driven reel while it is being unwound from the other reel, which is normally the case

^{Λ <-ι is} in an idle state. Under normal conditions, the entire tape is stored in a cassette on a supply reel, with the exception of a pretensioning part, which is connected to a take-up reel to enable the tape to be wound up thereon.

when the cassette is inserted into the recorder is. To avoid unnecessary complications and costs, the take-up reel is at a constant angular velocity driven. A major disadvantage of this type of system is that the tape never

maize can be guided past the recording transducer at a constant linear speed, thereby creating a number of difficulties will. One of them is that the tape is not economically used in terms of recording time since the linear speed of the tape starts at and from a predetermined minimum

Point grows out. The reason is that the linear speed of the tape gradually in the Dimensions increases as the diameter of the tape recorded on the take-up reel increases as the Take-up reel is driven at a constant angular speed. About rapid fluctuations in belt speed (flutter) to an acceptable minimum, it is necessary to keep the tape on the recording converter with a certain minimum Passing linear speed, which depends heavily on certain parameters of the belt. Naturally a satisfactory sound reproduction could be achieved if this minimum speed is maintained over the entire length of the belt could be. However, as the linear speed of the tape increases gradually over its entire length increased, the tape is transported at a speed that is greater than that required to maintain the Desired minimum level of rapid fluctuations in tape speed is required during recording is. In this way, the length of tape in the cassette on the transducer becomes substantial shorter amount of time moving past than would otherwise be necessary if the tape were at a constant linear speed would, of course, decrease the amount of recording time for a given length of tape will. Another disadvantage of the reel drive assembly is that the uniformity, with which the tape is guided past the transducer by

^ ® changes in the quality of the tape is dependent, as the tape is literally drawn off the supply reel by the take-up reel and is subject to physical strains that can cause slight fluctuations in the movement past the transducer. These fluctuations

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may not be played back in the monitor, resulting in a pronounced result Frequency difference in the reproduced signal leads, this in turn causing undesirable Represents fluctuations in the quality of sound reproduction.

The above disadvantages are due to the use of the so-called transport roller drive eliminated. With this arrangement, a transport roller is immediately adjacent in the recording apparatus arranged to the transducer, with an auxiliary or pressure roller arrangement it is provided that the tape is in an advancing relationship against the transport roller is pressed. The pressure roller is movably arranged in such a way that it disengages from the transport roller can be released when the tape feed is to be stopped. To avoid getting between the transport roller and the take-up reel in the cassette build up an untaut tape section, a further drive is provided for the take-up reel of the cassette, through which the reel with is rotated an angular speed which is fast enough, the tape with empty spool with the same Winding linear speed on the spool, with which the tape is transported by the transport roller. Typically a slip clutch is provided, see above that as the tape builds up on the take-up reel, the reel will gradually expand at a rate Can rotate lower angular velocity even if the drive of the take-up reel is at a constant Speed is maintained. A major advantage of the transport roller drive assembly is that, given Tape length the recording time reaches a maximum value, because the tape is moved past the transducer at a constant linear speed. Another advantage

the transport roller drive assembly is also that it provides excellent control for the Transport of the tape past the transducer enables, in particular, that it allows the transport of the tape past the wall at an extremely uniform linear speed allows, eliminating any tendency towards audio distortion resulting from changes in the Movement of the tape stems from the transducer past, is reduced quite significantly. Furthermore, since the transport roller is typically placed as close as possible to the transducer, the likelihood is that the physical characteristics of the belt in some way affect the uniformity of the linear velocity of the tape passed by the transducer, very little.

However, come in connection with transport roller tape drive assemblies certain difficulties. One of them is that the transport roller with must be driven at an extremely uniform angular velocity to produce a uniform linear velocity of the tape. Since the transport roller is typically a very small component Diameter -is, which has a very low mass and is therefore highly susceptible to minute changes in inertia, the drive power applied to the transport roller must be very precise. A second difficulty is that it is not only the transport roller that is driven must be, but also the tape reel and the movement of the pressure roller in contact with the transport roller for transporting the tape serving mechanism, which means that in this This type of system requires a greater number of parts to be driven than the tape reel drive system described above. It is therefore a larger input power, typically in the form of a larger input

drive motor, required.

These problems associated with miniaturized transport roller drive systems are well known Audio recording and playback devices proportionate easily resolved where size constraints related to the design of the drive components were not a major problem. However, these difficulties are associated with miniaturized, in the number of dictation devices to be held by hand has increased considerably and its solutions are made much more difficult. As follows as will become apparent in more detail, it has proven to be much more difficult to be highly stable Transport roller drive mechanisms with uniform Speed in the miniaturized form that these mechanisms must adopt in order to be spatially Compatible with the limited dimensions of a miniaturized handheld dictation machine to be.

One type of miniaturized transport roller tape drive system is shown in U.S. Patent No. 4,305,103, as best seen in FIG. 4 thereof is, a motor 24 drives a motor pulley 90, which in turn drives a flywheel 96 on which a Rubber tire 98 is provided, with a transport roller 36 being arranged coaxially with the flywheel 96 and through this is driven. If the tape is to be transported, this is done by a suitable mechanism a pressure roller 38 is brought into contact with the transport roller 36. Furthermore, a drive gear 92 is coaxial arranged to the transport roller 36 and drives an intermediate gear 94, which in turn tape reel gears 74 and 174 which are mounted on tape reel shafts 62 and 162. The tape reel shafts 62 and 162 drive the cassette reels over suitable disposable and slip

couplings to allow the tape to be wound and rewound between the tape reels. One of the main disadvantages of such a drive is the large amount of space required for the flywheel 96 so that it provides the necessary inertia to maintain the transport roller 36 at a uniform angular speed. From Fig. 1 it can be seen that the flywheel takes up substantially the entire width of the dictation machine, so that if a narrower design of the dictation machine than in Fig. 1 were desired, the flywheel would obviously have a smaller diameter, which leads to a loss Indolence would result. Another disadvantage is that a motor of relatively low speed must be used because there is only one simple speed reduction step between the motor and the transport roller, namely the reduction between the diameter of the pulley 90 and the diameter of the flywheel 96. Since it is more difficult If low-speed motors are to be kept at a constant speed than high-speed motors, a certain degree of inaccuracy in the drive system comes into play on the motor.
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Another form of transport roller tape drive arrangement is shown in U.S. Patent 4,134,145. from which it can be seen that a motor is provided with a drive pulley, one with a coaxial with the Transport roller arranged second driven pulley drives connected belt. One coaxial with the Transport roller arranged further pulley drives another belt, which in turn is a pair of Drives pulleys coaxial with the drive shafts for the tape reels of the cassette.

Although this type of drive arrangement

If the excessively large flywheel shown in U.S. Patent 4,305,103 is eliminated, it has disadvantages on that there is not a sufficiently high mass in the system for a sufficient inertial force to stabilize the drive chain and to maintain a constant linear speed of the tape and that also necessarily a motor of relatively low speed must be used because between the pulley of the motor and the pulley of the transport roller only a single-stage speed reduction is available. From this it follows that a really satisfactory one Transport roller tape drive assembly for use in a miniaturized handheld Voice recorder has not yet been found.

The foregoing difficulties and disadvantages of the known transport roller tape drive assemblies experience a significant remedy, if not at all, through the transport roller drive system according to the invention a complete fix. As will be seen in more detail below, the Invention in its broader aspects, a tape drive system for a handheld device Miniature dictation machine in which a generally rectangular frame of significantly greater length than Width is provided and adjoining one end of the frame is a cassette receiving and holding device for receiving and storing a tape cassette in a position in which a supply reels in the cassette stored tape is caused to operate with one of its parts between the reels to be exposed opposite the cassette towards the opposite end of the frame. A tape reel drive device is disposed on the frame in the cartridge receiving and holding area to selectively receive the

drive one or the other tape supply reel when the cartridge is in place in the frame. A tape transport roller is rotatably arranged on the frame in an intermediate position that it the Touches the inner surface of the exposed area of the tape, when the cassette is in place in the frame. A record / playback converter and an elastic one Auxiliary or pressure roller are arranged on a carrier device, which in turn is on the frame is arranged for limited reciprocation in the longitudinal direction of the frame, so that the transducer and the auxiliary roller between a forward position in which the transducer and the auxiliary roller are in contact with the outer surface of the exposed portion of the tape are in contact, and a rearward position in which both the The transducer and the auxiliary roller do not have any contact with the belt. A multi-level speed reducer the main drive of the system also arranged on the frame and extends between the aforementioned intermediate position and the end opposite the end of the cassette receiving of the frame and simultaneously drives both the transport roller and the tape reel drive device at a constant speed so that when the aforementioned carrier is in the forward position, the exposed area of the tape moves past the transducer at a constant linear velocity and is wound onto the tape reel.

In some of its narrower aspects, the invention features a high speed reversible motor on, which is adjacent to the frame at its opposite end serving to receive the cassette End is arranged. The engine is provided with a flywheel arranged on the drive shaft to allow the Propulsion system add an inertia, with a

Relatively small diameter pulley on engine drive shaft adjacent to flywheel and the input drive of a first pair of speed reduction pulleys forms between the engine and a further intermediate position between the engine and the intermediate position, on which the transport roller is located, are arranged. The other pulley of the first pair of speed reduction pulleys has a relatively large diameter, with a second Relatively small diameter pulley arranged coaxially with the large diameter pulley and forms the input drive of a second pair of speed reduction pulleys, that between the last-mentioned intermediate position and the intermediate position at which the transport roller is located is arranged. The first and second sets of speed reduction pulleys is connected by suitable belts to complete the drive. A feature of the invention is that the intermediate position where the larger diameter pulley of the first pair and the pulley smaller diameter of the second pair are arranged coaxially, either closer to the drive motor or closer at the intermediate position where the transport roller is located is arranged so that the length of the belts which comprise the first pair of speed reduction pulleys and the second pair of speed reduction pulleys connect, not which is the same.

This helps prevent spikes from rapid fluctuations in tape speed (flutter) that would occur if the two straps were the same length and therefore would have the same natural resonance from the detailed description below the invention will be more apparent.

From the foregoing brief description of the general nature of the invention, it will be apparent that one their main objectives are to provide an improved tape drive system for a handheld Miniature dictation machine exists.

Another object of the invention is to provide a tape drive system for an in hand miniature dictation machine to be held, in which a transport roller at a relatively low speed is driven by a high speed drive motor which has a multi-stage speed reduction arrangement used between the transport roller and the motor.

Still another object of the invention is to provide a tape drive system for an in miniature hand-held dictation machine that incorporates a pair of cassette tape supply reels is selectively driven by the same power source that drives the transport roller and with the same constant angular velocity, which is also used for the transport roller.

Finally, it is another object of the invention to provide a tape drive system for an in Hand-held miniature dictation machine in which the drive system has a number of flywheels for delivery a sufficient inertial force to the angular velocity to keep the transport roller constant despite changes caused by irregularities in the Operation of the motor or frequency changes caused by the belt drives.

341 81 8A

Further features, details and advantages of the invention emerge from the following description and the drawing, all of which are not mentioned in the text with regard to an essential disclosure of the invention Details are expressly pointed out. Show here:

¹ ^ Fig. 1 is a perspective view of a

to hold the miniature dictation device according to the invention in hand,

Fig. 2 is an exploded perspective view

position of the dictation machine shown in Fig. 1, seen from the side opposite to the illustration of FIG. 1,

Fig. 3 is a plan view of the dictation machine shown in Fig. 1, seen from the back of the dictation machine and drawn on an enlarged scale,

FIG. 4 is a plan view of the dictation machine shown in FIG. 1, seen from the front and drawn to the same scale as in Fig. 3,

Fig. 5 is a plan view of approximately the front half

of the dictation machine shown in Fig. 1, in which the relative position of a cassette in the dictation machine and the operating com-

. components for transporting the belt and for

Recording on this as well as for playback from this are shown, and the is drawn on an even larger scale compared to FIGS. 3 and 4, 10

FIG. 6 is a perspective view of the details shown in FIG.

7 is a perspective view of only the tape drive system extending from the drive motor at one end of the dictation machine to the tape reel drive assemblies located near the other end of the dictation machine;
20th

FIG. 8 is a sectional view of that shown in FIG Tape reel drive assemblies showing the details of the overrunning clutches and slip clutches of each arrangement are shown,

FIG. 9 is a perspective, partially exploded view of one component of the in FIG

Fig. 8 illustrated tape reel drive

Order forming overrunning clutch arrangements ,

Fig. 10 is a plan view of the tape reel drive assemblies; in which the parts of the overrunning clutches are shown in the position they are in when the drive belt is rotated take counterclockwise,

11 shows a view comparable to FIG. 10,

in which the position of the parts of the overrunning clutches are shown with a clockwise rotation of the drive belt, and

FIG. 12 is a perspective view of one of the slip clutches shown in FIG. 8; which is part of each of the tape reel drive assemblies.

As can be seen with reference to Figures 1 and 2, is the dictation machine in which the invention is embodied is, generally designated by the reference number 10 and has a in FIG. 2 generally by the reference number 12 designated main or frame part on which all components of the dictation machine are mounted, as well as a rear side cover 14 enclosing the rear area of the frame 12 and a front side cover Area of the frame 12 enclosing the front cover 16. A small cassette cover 18 is by means of a suitable hinge device 20 connected to an end edge of the lid 16 and encloses a Cassette chamber 22 formed in one end of the frame 12, in which one indicated generally by the reference numeral 24 Cassette can be received, which is in'der cassette chamber 22 in a to be described in detail below Way is arranged.

As best seen in Fig. 1, is on the

Frame 12 suitably has a plurality of control buttons arranged through openings in the lid 16 protrude so that they can be used by a user of the dictation machine to operate it with the thumb.

are accessible. The control buttons have a recording

button 26, as well as a combined recording lock and conference button 28, by which both the recording control is engaged, so that it is unnecessary to keeping the record button 26 pressed while dictating, as well as the dictation machine in a suitable manner is set to record voices from a distance, a combined rewind and play button 30, by means of which, by depressing and holding, rewinding the tape in the cassette 24 is caused to an initial starting position and when you let go of the dictation machine automatically is placed in a playback mode, a stop button 32, by which the dictation machine regardless of the operating state, in which it is when the stop button is depressed, can be stopped, one Signal button 34, by means of which an audible signal is placed on the tape in order to prompt someone to copy the tape To indicate to the person that a certain point on the tape (such as the end of a letter) has been reached is, a display reset button 36 by which the LED (Light Emitting Diode) display 41 (described below) is reset, and a fast-forward button 38 that moves the tape at a high speed can be moved in a forward direction, this function being the reverse of rewinding. The front cover 16 also has a window 40 through which the LED display 41 is exposed, which under the control of a microprocessor the user at all times with certain information concerning

^ O the operating mode of the dictation machine and also the position of the belt.

As can best be seen from FIG. 2, the dictation device 10 is supplied with energy by a

suitable battery 42, which through an opening 44 in a

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front end wall 46 of cover 16 is received and by means of a curved guide part 48 is held, which is preferably formed in one piece with the frame 12. A spring 50 is against the rear end face of the battery 42 is pressed on by means of a cover cap 52, which is secured by means of a screw thread engages opening 44 to hold the battery securely in place and also provide the necessary electrical contact between the battery and the operating components of the dictation machine to manufacture. As can be seen from FIG. 2, the overall arrangement of the parts of the dictation machine 10 is shown in FIG divided into three segments, a main drive assembly generally designated by the reference number 54, a capture / playback control assembly indicated generally by the reference numeral 56; and one generally cassette holder and drive assembly indicated by reference numeral 58. For a clear understanding the operation of the dictation machine 10 is first with reference to Fig. 2 to 6, the recording / Playback control arrangement 56 described.

As best seen in Figures 2, 3 and 6, a small DC motor 60 is suitable Way arranged at a central point of the frame 12, being on the drive shaft of the motor a Drive gear 62 is attached. The gear 62 meshes with an intermediate gear 64, which is coaxial with a further intermediate gear 66 is arranged, which

in turn meshes with a further intermediate gear 68 arranged on a shaft 70. The shaft 70 carries a worm wheel 72 which meshes with a pinion 74 which is arranged on a shaft 75, which extends perpendicular to the shaft 70 and carries a cam disk 76 at its other end. The alternate

Relationship of the parts described so far is best in Fiq. 6 can be seen, the particular shape of the Cam disk 76 is best seen in FIGS. 4, 5 and 6. The cam disk 76 has a radial extending stool or finqer 77 which engages a cam follower 78, the cam follower 78 represents the end portion of a rearwardly extending arm 80, best shown in Fig. 4 and 5 can be seen. The rearwardly extending arm 80 is part of a transverse support member 82 which carries a number of components to be described below. The transverse support member 82 extends from one side of the dictation machine to the other and is for a back and forth movement in the longitudinal

direction of the frame 12 by a plurality of pin and slot connections between the support part 82 and the frame 12 stored. These are particularly best seen in Figs. 3 and 5 as pins 84, 86 and 88, which are formed in one piece with the frame 12

can and engage with slots 90, 92 and 94, which are each formed in the support part 82. In fact, the slot 94 is in an area of the s.ch. rearwardly extending arm 80 of the support part 82 is formed. By comparing the relative position

of the pins and slots just described between FIGS. 3 and 5 and the angular position of the cam disk 76, with respect to the cam follower 78, it will be appreciated that by one of the methods shown in Figs. 5 outgoing position shown

Rotation of the cam plate 76 in the counterclockwise direction of FIG

Cam follower 78 gradually towards the bottom of the figure

is moved, i.e. backwards with respect to the dictation machine 10. As the cam follower 78 moves backward, The transversely extending support part 82 also moves backwards to the components 35 arranged thereon

away from the cartridge chamber 22. How best

4 and 6, a pair of springs 96 are interposed between corresponding openings 98 formed on the support part 82 and suitable counter bearings 100 formed on the frame 12. The purpose of the springs 96 is to retract the support member 82 to the position shown in Figure 5 once the cam plate 76 has rotated sufficient to move the finger 77 past the cam follower 78, or substantially into the position of these members shown in FIG. Thus, at this point it is clear from the parts described so far that the transverse support part 82 by the operation of the motor 60 via the gear train 62, 64, 66, 68, the worm wheel 72 and pinion 74 and the cam plate 76 and cam follower 78 forwards and backwards is reciprocated to thereby move the parts attached thereon to and from the cassette chamber 22. Reference is hereby made to US patent application no. 434 249 of 10/14/1982 with the designation "Head support and position adjustment assembly for a recording / playback device ¹¹ according to DE-OS 33 36 769, in which a more detailed description of the operation the record / playback control assembly 56 which forms the subject of the invention disclosed and claimed in this patent application. This application also discloses the electrical and electronic controls used in the record / playback control assembly 56 of the present application for the purpose of monitoring the position of the support member 82 by the aforementioned microprocessor and the control of the operation of the motor 60 are provided to change the position of the support member 82 in connection with the operation of the dictation machine.

As mentioned earlier, the transverse support member 82 is provided with components mounted thereon which

with the recording and playback capabilities of the Dictation machine related and also with the drive mechanism for the inside of the cassette stored tape, the latter being described in more detail below. The recording and playback component, in general referred to as a transducer 102, is attached to the support member 82 by means of a retaining clip 104, which is fastened to the support part 82 by means of screws 106, which can best be seen in FIG. As with As is well known in the art, the function of the converter 102 is to provide, in one mode of operation, a Create sound recording on the magnetic tape as the tape is moved past the transducer 102 and in another operating mode of the dictation machine to play back the previously recorded sound, while the tape is moved past the transducer 102 again. The electronic control circuits, by how this is achieved are well known in the art and do not form part of the invention.

As best seen in Figure 6, the transverse support member 82 also carries an auxiliary belt drive assembly, which has an elastic pressure roller 108 which is carried by an axle shaft 110 and is mounted for rotation in a fork 112, which is pivotable at one end by means of a bolt 114 the transverse support part 82 is connected. One wound around the bolt 114 and on a counter bearing 117 (best seen in Fig. 5) adjacent torsion spring 116 normally loads the free The end of the fork 112 against a stop 118, which is designed as part of the support part 82. Consequently the fork is usually clockwise around the

Mounting bolt 114 is loaded around. How best 6, there is a driven transport roller 120 in the frame 12 in the vicinity of the pressure roller 108 arranged, the transport roller 120 simply supported by the end region of a bearing 124 ' Shaft 122 is formed which is part of the cassette holder and drive assembly forms, the details of which are described below. As can be seen by looking at Fig. 5, when the support part 82 is in its front position, the pressure roller 108 is in such a way the driven transport roller 120 is moved into engagement that the stored within the cassette 24 Belt 124 (see FIG. 5) pinched between the pressure roller 108 and the driven transport roller 120 is to be driven thereby. The fork 112 clockwise around the bolt 114 The loading spring 116 maintains a uniform pressure between the pressure roller 108 and the transport roller 120 to ensure a constant drive of the belt and the value of the pressure between the To control roller 108 and the transport roller 120 by a suitable choice of the spring 116.

Also referring to FIG. 5, it should be noted that the transducer 102 is in contact with the belt 124 is brought when the support part 82 is in the front position shown in FIG. As As best seen in Figure 2, the cartridge 24 has a pair of elongated openings through which the band 124 is pressed by means of a pair of pressure pads 128, wherein

the pressure pads 128 are mounted on leaf springs 130 'suitably located in the cassette 24 which is provided with two of the openings 126 so that it can be inserted into the dictation machine 10 from either side, thereby making use of the tape 124 in FIG both directions of movement with respect to the cassette 24 is possible because the tape is able to record two sound tracks across its width.

It should be noted that the cartridge 24 is the subject of two U.S. Patent Application Nos. 388 and 388,539, both labeled "tape cartridge". Albeit the ones in these patent applications claimed inventions do not form part of the present invention the disclosure of the details of the cartridge 24 contained in these two applications by reference hereby included insofar as- these details for the understanding of the present Invention are useful. However, it should only be sufficient for an understanding of the present invention it should be noted that the cartridge 24, as best seen in Figures 2 and 5, is a pair of one another opposite parallel side walls 130 (of which only one in the figures Wall 130 is visible) and end walls 132 (of which only one such wall is visible), the serve to complete the cassette on three of its sides. The openings 126 form the main part '

the fourth side of the cassette. The cassette 24 is provided with an opening 134 through which the driving transport roller 120 extends when the cassette 24 is inserted into the cassette chamber 22 is. Since the tape 124 is in the Is held near the outer edge of the opening 134, the driving transport roller 120 is on the opposite side of the tape 124 from the pinch roller 108 when the cartridge is in the cartridge chamber is inserted, so that the tape 124 between the transport roller 120 and the pressure roller 108 for a transport of the tape is jammed when the parts are in the position shown in FIG .

To ensure that the cassette 24 is properly in place within the cassette chamber 22 is brought, the cartridge 24 is provided with a pair of stops 138, which is best shown in Fig.

5 it can be seen that with a corresponding pair of counter bearings 140 formed on the frame 12 are engageable when the cassette is inserted into the cassette chamber 22. Furthermore, in the End wall 132, which corresponds to that edge of the cassette

is opposite, at which the opening 134 is located, a slot 142 is formed into which an in the frame 12 formed projection 144 is receivable when the cassette 24 in the cassette chamber 22 is inserted. The stops and counter bearings 138 and 140 and the slot 142 and the Projection 144 are used for proper positioning and alignment of the cassette 24 while this is inserted into the chamber 22, so that the drive components to be described below of the dictation machine properly mesh with the hubs of the tape reels in the cassettes 24 .

Still referring to Figure 5, it can be seen that the cartridge 24 comprises a pair of tape reels 146, which are rotatably mounted in a suitable manner within the cassette 24, wherein only one of the reels depending on the direction in which the tape 124 is transported one supply reel and the other a take-up reel. Each of the coils 146 has a particular one shaped push-on part 148 which engages with a correspondingly shaped hub 150 with each of the hubs 150 being the driven member of a pair of cartridge drive assemblies represents, generally designated by the reference number and in more detail below are described.

Referring to Figs. 2, 3, 4 and 7

The main drive assembly 54 will now be described. As best seen in Fig. 2, a DC driven, reversible high-speed drive motor 154, which normally runs at around 2000 revolutions per minute during dictation and playback mode and at approximately 4000 revolutions per minute during fast forward and the rewind operation works, at the rear end of the frame 12 by means of fastening tabs 156 fixed to the frame 12 by screws. A flywheel 160 is mounted on the drive shaft 162 of the motor 154, with a pulley 164 of small diameter attached to the end of the drive shaft 162 adjacent to the flywheel 160 is. A drive belt 166 extends forwards and forwards with respect to the dictation machine 10 rotates around a large diameter pulley 168 which rotates on an axle shaft 170 is arranged, which on a at a predetermined distance from the drive shaft 162 is suitably attached to the frame 12 as follows is explained in more detail. Another pulley 172 of small diameter is rotatable arranged on the axle shaft 170, with a further drive belt 174 around the pulley 172 and also another large diameter pulley 176

is led around, which is rotatable on the aforementioned Shaft 122 is arranged, of which the driving transport roller 120 is a continuation Shaft 122 is, as mentioned earlier, arranged at such a point on the frame 12 that it is with the opening 134 of the cassette 24 is in alignment when the latter is inserted into the cassette chamber 22. As below Recourse to Fiq. 7 can be seen, a further small diameter pulley 180 is rotatable on the Shaft 122 attached, with another drive belt 182 around pulley 180 and also around pulleys 184, which are connected to the frame 12 in a manner which is described in the following in In connection with the description of the cassette drive assemblies 152 for which the pulleys 184 form the main drive part on the input side. Various components of those described above Drive chain starting with motor 154 and ending with pulleys 184 are in the Figures 2, 3, 4 and 6 can be seen.

Referring now to Figures 8, 9, 10 and 11, and particularly Figures 8 and 9, the following the details of the cartridge drive assemblies 152 are described. Each of the cartridge drive assemblies 152 has both an overrunning clutch and a slip clutch placed between the pulleys 184 and the cartridge hubs or drives 150. By doing first the overrunning clutch is considered, can be seen from Fig. 8 and 9 that in detail below Referring to only one of the cartridge drive assemblies 152, the pulley 184 is rotatable on a bearing member 186, which is secured in the frame 12 by an interference fit. The camp 186 is through a suitable cover ring 188 covered, which gives the surface a finished appearance. One

* Drive spindle or shaft 190 rotates into a received central bore of the bearing member 186 for rotation therein, the upper The end of the drive spindle or shaft 190 is provided with a plastic part 192, preferably a coating Its purpose will be described below. The overrunning clutch is between the pulley 184 and the lower end of the drive spindle

or shaft 190 set.
10

A circular cam 194 is rotatably arranged on a mounting part 195, the is in turn attached to the lower protruding end of the bearing 186 by an interference fit, where- ° when the fastening part 195 is flanged in such a way, that the cam 194 is held in the position shown in FIG. As best from Fig. 9 emerges, the cam 194 is provided with an arcuate recess 196 through which the loading

fastening bolt 198 of a latch 200 protrudes in such a way that that a screw 202 is passed through a hole formed in the fastening bolt 198 and screwed into a bore 204 formed in the underside of the pulley 184

can be, so that the latch 200 thereby with the pulley 184 is connected and rotated thereby. The other end of the latch 200 is with a pin 206 provided, which is in a in the cam

194 formed control cam recess 208 into-30

extends and depending on the direction of rotation

of the pulley 184 is directed radially inward or outward with respect to the cam disk Movement of the latch 200 causes. A pawl 210 is provided with ratchet teeth 212 and has 35

also has a hub 214 through which the pawl washer

* 210 fixedly attached to the lower end of the spindle 190 is so that it rotates with this. The arrangement is such that the latch 200 is normally beyond the outer periphery of the pawl disc 210, the end of the Latching pawl 200 with ratchet teeth 212 to one now to be described with reference to FIGS. 10 and 11 Way engaged and disengaged. First of all, it should be noted that a wave washer spring 216 such between the fastening part 195 and the cam 194 on the one hand and a shoulder of the bearing 186 on the other hand is set that they are on an end face of the cam disk 194 exerts a frictional force to a value-wise small resistance against a

¹ ^ to apply the movement of the cam disk 194 for a purpose which has yet to be explained in connection with the description of the operation of the overrunning clutch in connection with FIGS. 10 and 11.

From Fig. 10 it can be seen that upon rotation

of pulley 184 counterclockwise, as shown by the arrows in Fig. 10, the pulley the latch 200 moves in the same direction and thereby the pin 206 to the outer one Area of the cam recess 208 moved. The outer surface of the control cams from ^ ·. recess 208 is angled inwardly toward the center of cam 194, with the result that the pin 206, as long as the cam 194 remains stationary,

is moved inward against the center of the cam 194 and thereby the latch 200 carries with it, so that the end of the latching pawl 200 with one of the latching teeth 212 formed on the pawl disk 210

intervened. Remains during this movement 35

the cam disk 194 thanks to the shaft washer

spring 216 brought about resistance of the cam 194 to movement stationary, this resistance being sufficient to any effort
Cam 194 to overcome in one of the

both directions without the application of an outer one

Turning force. As soon as the pawl 200 has engaged one of the ratchet teeth 212, the pawl disc 210 begins to rotate together with the pulley 184, which in turn rotates the shaft 190,
since the pawl 210 has been fixedly arranged on the shaft 190 by means of the aforementioned press fit. At approximately the same time, the pin 206 of the latching pawl 200 reaches the end of the control cam recess 208 on the cam disk 194, which in turn starts a rotation of the cam disk 194
geqen the resistance of the wave washer 216 leads. At this point, according to the representation of FIG. The freewheel shown on the right side of the figure is fully engaged kupplunq, while the one on the

one-way clutch shown on the left side of the figure is fully disengaged.

When the direction of movement of the pulley

184 is reversed as shown in FIG. 11,

can now be seen with reference to the one-way clutch shown on the right-hand side of FIG. 11, that the latch 200 is responsive to the clockwise rotation of the pulley

184 is turned in the same way clockwise where -30

Caused by the pin 206 running up against the inner surface of the cam recess 208 is, this surface also being angled in such a way with respect to a radius of the cam disk 194

is that the pin 206 and thus the latch 200
35

with respect to the cam 194 radially outward

are pressed to release the pawl from engagement with the ratchet teeth 212. The relative movement between the fastening bolt 198 of the latching pawl 200 and the cam disk 194 is through the arcuate cutout 196 allows movement of the pulley 184 and the latch 200 over a limited arc length allows, while the cam through the wave washer 216 is held. This enables the inner and outer surfaces to act the cam recess 208 on the pin 206, in order to move the free end of the latch 200 inward and outward in such a way that one engagement in each case and a release of the engagement of that end of the pawl 200 with the ratchet teeth 212 is brought about will.

As noted above, the two cartridge drive assemblies 152 are similar in construction, with both are shown in Figures 10 and 11 to emphasize that they are simultaneous, with respect to engagement and disengagement, however, work in the opposite direction. Thus, as can be seen from Figures 10 and 11, the left clutch is disengaged when the right clutch is engaged and the right clutch is also disengaged, when the left clutch is engaged. When one of the two clutches is disengaged, it is located it can be seen that the cassette drive assembly is in a free-wheeling mode with the tape

can be withdrawn from the cassette reel associated with the disengaged clutch at any desired speed.

As mentioned briefly above, the cassette drive arrangement has a slip clutch which is used to pull through

the hub 150 has a drive of the cassette reel 146 (mentioned earlier in connection with FIG. 5) with a variable speed value regardless of the fact that the pulley 184 is attached to the cassette drive assembly applies an input drive power at a constant speed value. the The reason for this is that, as can best be seen in FIG. 5, during the winding up of the tape 124 on one of the two reels 146 depending on the direction of the tape drive the diameter of the Coil grows as the tape runs onto it. As the belt is driven by the driving transport roller 120 driven in cooperation with the pressure roller 108 at a constant speed value

¹ ^, the tape reel 146 on which the tape runs (the take-up reel) must be driven at a variable speed in order to avoid any slackening of the tape tension between the reel 146 and the driving transport roller 120. So if the

^ O take-up reel 146 is empty, it must be filled with a sufficient Angular speed are driven, so that a hub peripheral speed at least is equal to the linear speed of the belt. However, as the tape runs onto spool 146, The reel 146 is allowed to move at a gradually decreasing angular velocity due to the incoming tape rotate, which is accomplished by the slip clutch to be described now. It is of course obvious that the operation of the

Slipping clutch is unnecessary for the tape reel 146 from which the tape is unwound (the supply reel), since, according to the above explanation, the drive for this coil as a result of the fact that the

one-way clutch assigned to it is disengaged, 35

is in freewheeling mode. Therefore, the

Rotate the entire cassette drive assembly associated with the supply reel at any angular speed necessary to enable the tape to be unwound.
5

The details of the slip clutch are best seen in Fig. 12, which shows that the hub or the drive part 150 is provided with a slot 218 which extends over the full Height of the drive part 150 extends. Referring to FIGS. 8 and 12, it can be seen that the drive member 150 is disposed on the plastic cover 192 which has an elongated cylindrical portion 220 and an outwardly extending flange 222, which has a downwardly facing shoulder 224 and an upwardly facing cam surface 226 stipulates. The hub 150, as best seen in FIG. 12, is generally annular in shape and shape designed such that it fits over the circumference of the cylindrical portion 220 of the plastic coating 190, The hub 150 likewise has an inclined control cam surface 228 that is aligned with the control cam surface 226 to form a continuous inclined cam surface 226 and 228 which is used to to impart smooth alignment to the cassette 24.

while it is being loaded into the cassette chamber 22. The hub 150 is made of a suitable rigid, shape-retaining, but slightly resilient plastic molded so that the inner diameter of the hub 150 is slightly

is smaller than the outer diameter of the cylindrical portion of the plastic coating 192. Therefore, if the When the hub 150 is mounted on the plastic cover 192, a slight opening of the slot 218 is created, so that the inner diameter of the hub 150 is now the outer diameter of the cylindrical

Area 220 of the plastic coating 192 corresponds. Because of the elasticity of the plastic, the inner surface of the hub 150 with sufficient force against the outer surface of the cylindrical Area 220 of plastic coating 192 to normally cause a co-rotation of the hub 150 through the plastic coating 192, but a slip between the surfaces in the event that the belt does not rotate the hub as quickly ^ O 150 allows the plastic coating to rotate.

There is therefore a slip between the parts, so that the hub 150 depending on the amount of Winding the tape 124 on the take-up reel at a variable speed is capable of while the plastic cover 192 can rotate at a constant rate of speed as it can is supplied by the drive of the shaft 190.

List of reference symbols overrunning clutch

10 voice recorder

12 main or frame part

14 back cover

16 front cover

18 cassette lid

20 hinge device

22 cassette chamber

24 cassette

26 Record button 15

28 combined retainer locking and

Conference button

30 combined rewind and playback button

32 stop button

34 Signal button

^ O 36 Display reset button

38 Fast forward button

40 windows

41 LED visual display

42 battery 44 opening

46 end wall

48 guide part

50 spring

52 Lid cap

54 Main Drive Arrangement

5 6 Recording / playback control arrangement

58 Cartridge Hold and Drive Assembly

60 DC motor

62 drive gear

64 idler gear

66 idler gear

68 idler gear

70 wave 72 Worm gear 74 pinion 75 wave 76 Cam disc 77 finger 78 Cam follower 80 poor 82 transverse support part 84, 86, 88 pens 90, 92, 94 slots 96 feather 98 opening 100 Counter bearing 102 Converter 104 Retaining clip 106 screw 108 Pressure roller 110 Axle shaft 112 fork 114 bolt 116 Torsion spring 117 Counter bearing 118 attack 120 Transport roller 122 wave 124 · camp 126 opening 128 Pressure pad 130 ' Leaf spring 130 Side wall 132 Front wall 134 opening 136 Tape guide element 133 Conn ig 140 G-.2 g s η 1 ng or 142 slot

144 advantage

146 reel

148 clip-on part

150 hub

152 Cassette Drive Assembly

154 drive motor

156 mounting bracket

158 screw

160 flywheel

162 drive shaft

164 pulley

166 Belts

168 pulley

170 axle shaft

172 pulley

174 drive belts

176 pulley

180 pulley

182 drive belts

184 pulley

186 bearing part

188 cover ring

190 drive shaft

192 plastic part

194 cam

195 fastening part

196 arcuate recess 198 fastening bolts

200 latch

202 screw

204 bore

206 pen

208 control cam surface

210 pawl washer 35

212 instep teeth

, Hl Nib »?

2 16 W <? 1lonsch ^ ibonfod'T

218 slot

220 cylindrical area

222 flange

224 shoulder

226 control cam surface

228 control cam surface

Claims (17)

Claims il ..jTape drive system for a transport roller-driven tape recording / playback device which can be actuated to wind a tape onto a reel, characterized by a drive motor (154), a transport roller (120) cooperating with a pressure roller (108) for transporting a tape, at least one drive hub (152) for driving a tape reel (146) on which the transported tape is wound, a first pair of speed reduction pulleys (164, 168) extending between the drive motor (154) and an intermediate position and interconnected by a first drive belt (166) between the intermediate position and the transport roller (120) extending second pair of speed reduction pulleys (172,176) which are interconnected by a second drive belt (174) that the transport roller (120) from the drive motor (154) at a reduced speed is driven, and e one of the first and second pairs of speed reduction pulleys (164,168; 172, 176) coupled device (180 to 184) for driving the at least one drive hub (150). 2. Belt drive system according to claim 1, characterized in that the drive motor (154) is a high-speed motor is. 3. tape drive system according to claim 1 or 2, characterized characterized in that the drive motor (154) has a drive shaft (162) with which one of the pulleys (164) of the first pair of speed reduction Pulleys (164, 168) is coupled, and a flywheel (160) attached to this drive shaft (162). 4. Belt drive system according to one of claims 1 to 3, characterized in that a rotatable shaft (170) is provided at the intermediate position and that the other Pulley (168) of the first pair of speed reduction pulleys (164,168) is mounted on the rotatable shaft (170), the diameter of the one pulley (164) is smaller than the diameter of the other pulley (168) and one of the pulleys (172) of the second pair of speed reduction pulleys (172,176) is attached to the shaft (170) located at the intermediate position and the other pulley (176) of the second pair of speed reduction pulleys (172,176) is coupled to the transport roller (120). 5. Belt drive system according to one of claims 1 to 4, characterized in that the transport roller is formed by a continuation of a rotatable shaft (122), on which the other pulley (176) of the second pair of speed reduction pulleys (172,176) is attached, the diameter of a pulley (172) of the second pair of speed reduction pulleys (172,176) is smaller than the diameter of the other pulley (176) of the second pair of speed reduction pulleys (172,176), and wherein those for driving the at least one drive hub (150) serving device (180 to 18.4) one on the latter rotatable shaft (122) attached further pulley (180), and one with the at least one Drive hub (150) coupled additional pulley (184) and a drive belt (182) interconnecting the further and additional pulleys. 6. Belt drive system according to claim 5, characterized in that that the additional pulley (184) is arranged coaxially to the at least one drive hub (150) is. 7. tape drive system according to claim 5 or 6 for a bidirectional drive of the tape between a first and a second reel, characterized in that one second drive hub (150) is provided for driving the second spool (146), and one coaxial with the second Drive hub (150) arranged second additional pulley (184), and that the latter drive belt (182) the further (180) and the first and second-mentioned additional pulley (184) connects to one another, and that the drive motor (154) is formed by a reversing motor. 8. Belt drive system according to one of claims 1 to 7, characterized in that the first pair of speed reduction pulleys (164,168) a pulley arranged on the drive shaft (162) of the motor (154) (164) of relatively small diameter and one on a first provided at the intermediate position Has shaft (170) arranged pulley (168) of relatively large diameter, and that the second pair of speed reduction pulleys (172,176), one on the first provided at the intermediate position Shaft (170) arranged pulley (172) of relatively small diameter and one on one with the transport roller (120) rotatably arranged second shaft (122) arranged pulley (176) of relatively large diameter having. 9. tape drive system according to any one of claims 1 to 8, characterized in that the first pair of First drive belt (166) connecting speed reduction pulleys (164,168) is longer than that second drive belts (174) connecting a second pair of speed reduction pulleys (172,176). 10. Belt drive system according to one of claims 1 to 9, characterized by a first and a second Drive hub (150) for driving a first and a second tape reel (146), one for rotation with the transport roller (120) arranged drive pulley (180), one in each case arranged coaxially to the respective drive hub (150) driven pulley (184), and one of the aforementioned driven pulleys (184) and the driven Belt (182) connecting the pulley (180). 11. Tape drive system for a dictation machine, characterized by a generally rectangular frame (12), the length of which is noticeably greater than its width, a arranged on the frame (12) adjacent to one of its ends means (58) for receiving and holding a Tape cassette (24) in a position in which that stored in the cassette (24) on tape supply reels (146) Tape is caused to have a portion thereof between the reels (146) operative with respect to the cassette (24) is exposed towards the opposite end of the frame (12), one on the cassette receiving and holding device (58) of the frame (12) arranged tape reel drive means (152) for selectively driving the one or the another tape supply reel (146) when the cassette (24) is in position in the frame (12), one on top of the Frame (12) in a first intermediate position so arranged transport roller (120) that it is with the inside the exposed area of the tape engages, when the cassette (24) is in position in the frame (12), a record / reproduce converter (102) and a elastic auxiliary roller (108), one on the frame (12) for limited reciprocating movement in the longitudinal direction of the frame (12) arranged carrier device (82) on which the transducer (102) and the auxiliary roller (108) are arranged are for movement between a forward position in which the transducer (102) and the auxiliary roller (108) with the Outside of the exposed portion of the tape are engaged such that the transducer (102) selectively one Recording on or a playback from the tape and the auxiliary roller (108) the tape in a transport engagement with the transport roller (120) pushes, and a rear position in which both the transducer (102) and the auxiliary roller (108) are not in engagement with the belt, and one arranged on the frame (12) and between them the first intermediate position and the opposite end of the frame (12) extending multi-stage speed reduction main drive means (54) for simultaneously driving the transport roller (120) and the tape reel drive device (152) with a uniform velocity value, wherein when the carrier device (82) is in the forward position, the exposed area of the tape at a uniform linear velocity is moved past the transducer (102) and wound onto one of the ribbon supply reels (146). 12. Belt drive system according to claim 11, characterized in that that the main drive device (54) is arranged in the frame (12) adjacent to the opposite end Having high speed motor (154) and a number of between the motor (154) and the transport roller (120) set speed reduction Pulley assemblies (164-176). 13. tape drive system according to claim 12, characterized in that the number of speed reduction pulley assemblies one between the motor (154) and one between the motor (154) and the transport roller (120) located second intermediate position first pair of speed reduction pulleys (164,168), as well as a second arranged between the second intermediate position and the transport roller (120) Pair of speed reduction pulleys (172,176) and one the speed reduction pulleys (164, 168; 172, 176) of each of the pulley assemblies connecting a pair of drive belts (166, 174) for transmission a driving movement from the motor (154) to the transport roller (120). 14. tape drive system according to claim 13, characterized in that the first pair of speed reduction pulleys (164,168) one on the drive shaft (162) of the motor (154) arranged pulley (164) of relatively small diameter and one on a the frame (12) in the second intermediate position rotatably arranged first shaft (170) arranged belt pulley (168) of relatively large diameter, and that the second pair of speed reduction pulleys (172,176) a belt pulley arranged on the shaft (170) located at the second intermediate position (172) of relatively small diameter and one on top of the frame (12) at the first intermediate position having a rotatably arranged second shaft (122) arranged pulley (176) of relatively large diameter, wherein the transport roller (120) is formed by an end region of the second shaft (122). 15. Belt drive system according to claim 13 or 14, characterized in that the second intermediate position is closer to the first intermediate position than is the motor (154) so that the first pair of speed reduction pulleys (164,168) connecting drive belts (166) is longer than that of the second pair of speed reduction pulleys (172,176) connecting drive belts (174). 16. Tape drive system according to one of claims to 15, characterized in that the tape reel drive device (152) a pair of in the cartridge receiving and holding means (158) of the frame (12) rotatably arranged drive hubs (150) which correspond therein to the position of the central openings of the tape supply reels (146) of the cassette (124) at in the frame (12) inserted cassette (24) are arranged and one between the pair of drive hubs (150) and the main drive device drive device switched to the first intermediate position. 17. Belt drive system according to claim 16, characterized in that the last-mentioned drive device a drive pulley (180) arranged on the frame (12) at the first intermediate position for rotation, as well as a belt pulley (184) each coaxially to the drive hubs (150) and all of these Belt connecting pulleys (182).