JPS59221852A - Tape driver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates generally to the field of office dictation devices, and more particularly to a drive mechanism for a small, portable dictation machine.

Conventional technical office dictation devices have been in widespread use for half a century, and are used in many office settings where devices of various types dictate a variety of multivalued information that must be recorded and transcribed. was born in Although the dictation device has seen many changes over the years, one aspect of the device that remains fairly constant is the size and form in which it is kept in the office for the placement and use of the device. It is. A dictation machine is usually a device with an area of 10 million to 10 million inches and a height of 3 to 4 inches, and is placed on the user's desk in a convenient position for the user to sit. It allows you to hold a suitable microphone nearby. This microphone is connected to the dictation machine by a wire. Various media are used to record the user's voice. For example, there are cylinders and disks, and grooves similar to those on known records are formed on these cylinders and disks.

Furthermore, a wide plastic belt with grooves cut into it,
There is a wide range of magnetic belts on which the user's voice is recorded by means of magnetic tracks, and more recently magnetic tape is fed from a supply reel to a take-up reel, known in tape recorder technology. It is stored in a cassette, which is often mentioned regarding playback devices.

Over the past few years, quite significant changes have occurred with respect to the development of dictation machines. This is the tape force used and the
Recent dictation devices are due to the miniaturization of child parts. It would be highly desirable if the entire dictation machine could be reduced in size to the size of the microphone unit of an ordinary desk dictation/recording machine, which would be highly desired by both engineers and businessmen in the field of such equipment. ing. It can also be seen that the advantages of such a dictation machine provide the following substantial features: In other words, such a recorder eC is used 1.
Persons do not normally need to place the recorder on the desk or other location that houses the dictation device, and there is no need to place the recorder in a location away from where it is normally kept, and there is no risk of emergency if the recorder is used in a location away from where it is normally kept. This eliminates the inconvenience of moving heavy and bulky equipment. Therefore, there are currently a variety of miniaturized portable dictation recorders on the market, each with a different appearance. These recorders provide the desired control and operation, and what they have in common is that they are small enough to be stored in one hand while in operation. Measuring on average 6 inches long, 3 inches wide, and 1 inch thick, these dictation machines are battery-operated and record voices onto magnetic tape stored in cassettes, which can be rewound and recorded instantly. It has all the elements to play the tape's sound. As is obvious to anyone who has researched this type of product, the market for portable dictation machines has grown significantly, with a number of major national and international electrical and office equipment manufacturers mutually controlling the market for this product. are competing.

As with the field of other electronic products, recent technological advances in miniature electronic components have certainly made the design and development of miniaturized dictation machines much easier. Development of small microphones, small transducers that record on magnetic tape and play back sounds, various electronic components used in devices that record and play back sweat, small speakers, etc. (Major contribution to the technology of small voice recorders) A major and very difficult problem with the design of compact dictation machines, as often mentioned, is the miniaturization of the mechanical elements necessary to move the recording element, i.e., the recording/playback head, through the transducer. The miniaturization of dictation machines did not reach the point where magnetic tape cassettes were developed, due to the fact that recording media consisting of large-sized tapes and wide belts could not be miniaturized. It was extremely thin with a Mittalon base and was quite thin at 2 mm, which made it possible to develop a dictation recorder.This recorder was used for the Kinen 1, a cassette that was smaller than the JJ hand and capable of recording over 30 minutes. However, the mechanical elements necessary to record or record audio from a cassette and move the tape into the cassette have made miniaturization extremely difficult for a number of reasons, one of which is The second reason is that as mechanical parts become smaller, they become weaker and cannot exceed the strength normally imparted to perform the desired function. Another reason lies in the difficulty of designing small parts with limited strength to interfit and function properly when substantial amounts of motion are required. Another reason is that large Similar to desk dictation machines using high capacity motors, there is a problem in using the limited amount of power from the battery to drive the small capacity motors to accomplish all the mechanical operations. These problems have led to numerous designs and developments in the field of compact dictation machines to find solutions to them.While many of these problems have now been largely solved, some Until a suitable solution has been found, further problems have arisen with the solutions hitherto provided, necessitating further solutions.Therefore, considerable technological development in small dictation machines has occurred. This remains true, particularly with respect to the reduction in the overall size of these machines to enhance portability and ease of use.

Many audio recording and sound reproducing devices using magnetic tape employ two systems in which the tape is moved from one reel to the other by a reel via a recording and reproducing transducer. A mechanically simple method is the so-called tape reel drive system. In this system, 10,000 of the tape holding reels in the cassette are driven to wind the tape on the driven reel, and at the same time, tape is taken up from other reels that are normally in an idle link state.

Under normal conditions, all tapes in the cassette are stored on the supply reel. However, the tip is not stored on the supply reel because it is connected to a take-up reel so that the tape is wound onto it when it is loaded into a cassette or recorder. The take-up reel is driven at a constant angular velocity to avoid unnecessary complexity and expense. A major drawback of this system is that the tape can never be moved past the recording transducer at a constant linear velocity. And this causes many problems. For example, tape cannot be used effectively in terms of recording time. This is because the linear velocity of the tape starts at a certain minimum and increases from that point. This is because the linear velocity of the tape gradually increases with increasing diameter of the tape to the take-up reel. This is because this take-up reel is driven at a constant angular velocity. In order to keep playback irregularities to a minimum acceptable level, it is necessary to feed the tape through the recording transducer at a certain minimum linear velocity that varies widely depending on certain characteristics of the tape.

More specifically, if this minimum speed is maintained throughout the length of the tape, satisfactory audio playback will be obtained. However, since the linear velocity of the tape increases progressively over its length, the entire tape is fed at a faster rate than necessary to maintain the desired minimum playback unevenness level during recording. Thus the length of tape in the cassette passes through the transducer in considerably less time than would be required if the tape were moved at a constant linear speed, and this of course reduces the recording time for a given length of tape. decreased
I'm thin. Another disadvantage of reel drives is that the uniformity with which the tape is fed through the transducer is highly dependent on the quality of the tape.

This is because the tape is pulled from the supply reel by the take-up reel, thereby subjecting it to physical stress that can result in slight fluctuations as the tape passes through the transducer. Since these variations would not be reproduced within the recording device, this would result in noticeable differences in the frequencies of the playback and would lead to undesirable changes in the quality of the audio playback.

The above-mentioned drawbacks are eliminated by the use of so-called capstan devices. In this device, a capstan is placed in a recording device in close proximity to the transducer, and a pressure roller device is provided to drive the tape into the capstan/capstan.
and press into the supply board.

This pressure roller is movably mounted so that the
When it is desired to stop the supply of caps, the caps can be uncoupled from the drive capstor. A separate drive is provided in the cassette take-up reel to prevent looseness from occurring between the drive capstan and the data amplifier reel in the cassette. The drive is rotating the reel at an angular velocity sufficient to wind the tape onto the reel when the reel is empty at the same linear velocity as the tape is fed by the drive capstan.

Typically, a slip clutch is provided which allows the reel to rotate at a slower and slower angular velocity as the tape is wound onto the take-up reel, even though the drive to the take-up reel is maintained at a constant speed.

The main advantage of a driven capstan feeder is to maximize the recording time of a given length of tape.

This is because the tape is fed through the transducer at a constant linear velocity. Another advantage is the superior control over the feeding of the tape through the transducer, in particular the ability to feed the tape through the transducer in a very uniform direct velocity wave, thereby controlling the movement of the cheese through the transducer. Distortion of audio caused by changes in ff can be significantly reduced.Since this drive capstan is usually mounted very close to the transducer, the physical properties of the tape or the amount of tape passing through the transducer can be significantly reduced. There is little to no effect on uniform linear motion.

However, there are several problems that occur with gear drive tape supply mechanisms. One is that the capstan must be driven at a very uniform angular velocity to achieve uniform linear velocity of the tape. Since this drive capstan is usually a very small diameter element with a very small quality, the drive input to this gear capstan must be very accurate and precise. Must not be. The second problem is that not only this drive capstan must be driven, but the tape reel must also be driven as well as the mechanism that drives all the pressure rollers in contact with the capstan to drive the tape. . This means that in this single-ply method, a larger number of parts must be driven than in the tape reel drive method described above. Therefore, a larger input power for a somewhat larger drive motor is usually required.

These problems in a miniaturized capstan drive feeder mechanism are fairly easily overcome in a single audio recording and playback device where the dimensional limitations of the drive element design are not a major problem. However, these problems have been greatly magnified in the field of miniaturized, hand-held dictation devices, and their solutions have become extremely difficult. As will be discussed below, the design of a miniaturized hand-held dictation device must be physically compatible with the limited size of the capstan drive mechanism, which has a highly stable and uniform speed. It has proven to be extremely difficult to provide this.

One compact CAGSUKUN driven tape feeder is shown in U.S. Pat. No. 4,305,103. In this patent,
As shown in FIG. 4, the motor 24 drives a motor pulley 90, which in turn drives a rubber tire 98.
It drives a flywheel 96 having a. A drive capster/36 is coaxial with this flywheel 96 and is driven by it. A pinch roller 38 is brought into contact with the capstan 36 by a suitable mechanism when it is desired to dispense tape. Also, moving gear 9
2 is mounted coaxially with this capster/36 and drives an intermediate gear 94, which in turn drives a reel gear 74.174. These gears 7
4.174 is placed on the reel shaft 62.162. The reel shaft 62.162 drives the wrestler reel via a suitably powerful one-way clutch and slip clutch to facilitate tape rewinding and rewinding between the tape reels. One of the major drawbacks of this drive type is the capstan 36.
．． There is a large amount of space required for the flywheel 96 to provide the necessary inertia to maintain zero uniform angular velocity. As can be seen from Figure 1, this flywheel occupies substantially the entire width of the dictating device; however, if a narrower dictating device is required than shown in Figure 1, the flywheel may be smaller (2) in diameter. It is obvious that we must have , which naturally comes at the cost of inertia.

Another disadvantage is that a relatively low chain motor must be used. This is because there is only one deceleration stage between the motor and the drive capstan. This reduces the distance between the diameter of pulley 90 and the diameter of flywheel 96.

This drive naturally introduces some inaccuracy into the motor since it is more difficult to maintain a constant speed with a slow motor than with a high speed motor.

Another type of capsun drive tape feeder is shown in U.S. Pat. No. 4,134,145.

In this example, the motor has a drive pulley which drives a second drive belt mounted on the same axis as the drive capsun, which is connected to the drive pulley. A separate belt is driven by a separate gear wheel placed coaxially with the drive capstan, which in turn drives a pair of pulleys placed coaxially with the layer drive shaft for the cassette reel. is driving. Does this type of drive reduce the need for a very large flywheel as shown in the aforementioned patent 4305103?
4. Stabilize the trifle chain and maintain a constant linear velocity of the tape. It has the disadvantage of not having enough mass to provide sufficient inertia to hold the IB. Furthermore, this device requires the use of a relatively low-speed motor because there is only one stage of reduction gear between the motor boost and the drive capstan boost.

Therefore, there was no truly satisfactory capstan live chive feeding device in the 1111 of the present invention for use in a small handheld dictation recorder.

The above-mentioned problems and drawbacks of the 11-year-old cab stan drive table feeding mechanism are substantially, if not completely, eliminated by the gear stan drive device of the present invention. . As will be described below, the present invention generally includes a tape drive mechanism for a small portable recording machine, within which there is a generally rectangular frame that is substantially longer in length than in width. ,
A cassette and a storage means are provided near one end of the frame body to receive and store the tape cassettes in a predetermined position, and to remove all tape cassettes wound onto the cassettes on the storage reel from all tape cassettes at the opposite end of the frame body. A portion of the reel is operatively exposed to the reel. Tape reel drive means is mounted on the frame within the cassette receiving and storage area for purposely driving one or the other of the tape storage reels when the cassette is positioned within the frame. The tape drive capstan is rotatably mounted on the frame in an intermediate position so that it contacts the inner surface of the exposed portion of the tape when the cassette is positioned on the frame.

The recording/playback transducer and the resilient backup or pressure roller are both mounted on a support means which in turn is mounted on the frame for limited reciprocating movement in the longitudinal direction of the frame. There is. This causes the transducer and backup roller to move between a forward position where the transducer and backup roller contact the exposed outer surface of the tape and a rearward position where the transducer and backup roller are away from the tape. In addition, a multi-stage deceleration ball drive device is placed on the frame, and there is a long distance between the intermediate position described in MiJ and the end of the frame opposite to the end where the cassette is placed. , the drive capstan and the tape reel drive means are driven once every 11th edition at a constant speed. As a result, when the branch is in the IJ direction position,
The exposed portion of tape is moved through the transducer and wound onto a tape reel at a constant linear speed.

The present invention is a cassette or an accepted part and anti-substrate:! It includes a high-speed reversible motor mounted on the frame near A. This motor: In order to provide inertia to the production equipment, a flywheel mounted on the drive shaft is shouldered, and a relatively small diameter bobbin is mounted on the motor drive shaft close to the flywheel. Another intermediate position between the motor and the intermediate position in which the drive capstan is located constitutes the input of a first pair of reduction pulleys mounted between the motor and the motor. The other of the first pair of reduction pulleys has a considerably larger diameter, and the second, considerably smaller diameter pulley is mounted coaxially with this larger diameter pulley and is located in an intermediate position and drive cap as described below. It forms the input of a second pair of reduction pulleys which are mounted between the intermediate position in which the stun is located. The first and second sets of reduction pulleys are connected by suitable belts to complete the drive. The feature of the present invention is that the intermediate position where the first pair of large diameter pulleys and the second pair of small diameter pulleys are coaxially mounted is such that one or the other of the drive motor and the drive capstan are positioned. The belt connecting the first pair of deceleration pulleys and the second pair of deceleration pulleys is the same length and has a long service life. It is. This reduces vibration peaks that would occur if the two belts were of the same length and had the same resonance, as will become apparent from the detailed description of the invention that follows.

As stated in the general characteristics of the invention, a principal object of the invention is to provide an improved tape drive for a small handheld dictation machine.

Another object of the present invention is to provide a compact handheld device in which the drive capstan is driven at a relatively low speed by a high speed drive motor using a multi-stage reduction gear between the drive capstan and the motor. An object of the present invention is to provide a tape 1 drive device for a recorder.

Yet another object of the invention is to select a pair of tape storage reels mounted within a cassette with the same power source driving the drive capstan with a similar constant angular velocity imparted thereto. It is an object of the present invention to provide a tape drive device for a small hand-held dictation recorder that is driven by the user.

Another purpose is to provide sufficient inertia to keep the angular velocity of the drive capstan constant despite variations due to non-uniformities in motor operation or vibration variations caused by belt drive. To provide a tape drive device for a small hand-held dictation machine having a flywheel.

More specifically, the invention relates to a tape drive for a portable recording machine, particularly of a size that can be held in one hand.

The dictation machine has a chamber for receiving a tape cassette having a pair of reels with a pair of drive spindles engaged to drive the tape reels.

A tape drive capstan and a backup roller are located near the tape cassette chamber. A motor is positioned at the opposite end of the dictator tape cassette chamber, and a multi-stage reduction belt and pulley drive arrangement is positioned between the motor and the drive capstan, connecting the drive capstan, tape reel, and drive spindle. They are driven simultaneously at a uniform speed.

The above and other objects and advantages of the present invention will become apparent from the description of preferred embodiments of the invention in conjunction with the following drawings.

A specific example will be described below.

1 and 2, a dictation machine incorporating the present invention is designated by the number lO, and this recorder is designated by the number 12 in FIG. 2, which contains all the elements of the dictation machine. It has a main body or frame as shown, a back cover 14 surrounding the rear of the frame 12, and a front cover 16 surrounding the front of the frame 12. A small cassette cover 18 is connected to the edges of the cover 16 by suitable hinge means 20 and formed to one end of the frame 12, surrounding the cassette chamber 7'522. This chatuba 22 is adapted to receive a cassette 24. The process of loading the cassette 24 into the chatuba 22 will be described later.

As shown in FIG. 1, a plurality of control buttons are carried by a cover 16 on the frame j2 and protrude from an opening in the cover 16 so that the user of the dictation machine can operate them with his or her thumb. ing. The lf control system controls the recording button 26 and the recording mode so that it is not necessary to hold down the recording button 26 during the entire dictation). ′
ζ Cent recording lock and conference button 28
a rewind play button 30 which, when pressed and held, rewinds the tape of the cassette 24 towards its initial starting position; A stop button 32 that can be pressed to stop the recorder in any state, a cue hocun 34 that sets a voice signal to the tape to notify the recorder that the tape has reached a specific point, and a liquid crystal display (described later). It has a display reset button 36 for setting the LCD (LCD) 41, and a forward fast-forward control button 38 that functions in the opposite direction to rewind and fast-forwards the tape forward. Front cover 16 also has a window 40. This window 40 displays an LCD display 41. The display 41, under microprocessor control, provides information to the operator regarding the mode of operation of the dictator and also the position of the tape at any given time.

As shown in FIG. 2, the dictation machine 10 is powered by a suitable battery 42. The battery is received in the opening 44 in the end wall 46 of the cover 16 and preferably in the frame 1
It is held in place by a curved guide member 48 which is integrally formed with 2. A spring 50 is pressed backwards of the battery 42 by a camp 52;
threadedly engages the aperture 44 to hold the electricity firmly in place, providing the necessary recreational connection between the 4-hole and the operative elements of the dictation machine. Please refer to Figure 2]
The entire arrangement of the parts of 1 Iso 1,0 is divided into three parts. Main drive part 54 and recording/playback 1lill side I
1jlj portion 56, and a cassette mounting drive portion 58. This facilitates understanding of the operation of this device 10.

First, regarding the recording 7/playback control section 56, Section 2-6
This will be explained with reference to the figure.

As shown in FIG. 2.3.6, a small DC motor 60 is suitably placed in the center of the frame 12, and one drive gear 62
is placed on the motor drive shaft.

This gear 62 meshes with an intermediate gear 64. This gear 64 is mounted coaxially with another intermediate gear 66, which in turn is mounted on the shaft 70/against another intermediate gear 68. A shaft 70 carries a worm gear 72, and a shaft 75 extends perpendicularly to the gear 72 and carries a cam 76 at its opposite end.
The pinion 74 is engaged with the pinion 74 carried on the pinion 74 . The interrelationship of each part is further described in FIG. The special shape of the guide rim 76 is shown in FIGS. 4.5 and 6. Cam 76 has a radially extending ridge or finger 77 that engages cam follower 78.
have. This cam follower 78 forms a terminal portion of a rearwardly extending arm 80 shown in FIGS. 4 and 5. The rear extension arm 80 forms part of a lateral support member 82 that supports a number of components to be described below. This side support member 8
2 extends from one side of the dictation machine to the other side and the support member 8
2 and the frame 12 for limited reciprocating movement in the longitudinal direction of the frame 12. In particular, these pins 84 are shown in Figures 3 and 5.
．． It is well shown as 86.88.

These pins are placed on the frame 12 and the unscrewed support member 8
The grooves 90 are operatively formed in the portion of the rearwardly extending arm 80 of the support member 82, respectively engaging grooves 90, 92, 94'' formed in the cam follower 78. By comparing the relative positions of the pins and grooves described in FIGS. 3-5, along with the angular positions, it can be determined that rotation of the cam 76 in a counterclockwise direction starting from the position shown in FIG. It will be seen that the cam follower 78 moves rearwardly relative to the dictation machine 10. As the cam follower 78 moves rearwardly, the laterally extending support member 82 also moves rearwardly to remove the elements placed thereon from the cassette. 4 and 6, a pair of springs 96 are inserted between the appropriate hole 98 formed in the support member 82 and the appropriate abutment piece 100 formed in the frame 12. The purpose of this spring 96 is to move the cam 76 to the position shown in FIG. 5, i.e., substantially as shown in FIG. G of these elements
The purpose is to pull back the support member 82 in the Z position trench.

Thus, here the above-mentioned parts, gear train 62, 64.
66.68, worm gear 72, pinion 74, cam 7
6. From the operation of the motor 60 via the cam follower 78, the side support members 82 move forward and backward, moving the components placed thereon toward and away from the cassette chamber 22, respectively. That will be understood.

Reference may now be made to U.S. Pat.

This application describes the recording/playback of this invention for the purpose of detecting the position of the support member 82 by means of the aforementioned microprocessor and controlling the operation of the motor 60 to vary the position of the support member 82 with respect to the operation of the dictation machine. Control and assembly equipment 5
6 discloses the electrical and electronic controls contained in this document.

As previously mentioned, the lateral support members 82 carry two elements relating to the recording and playback characteristics of the dictation machine and the drive mechanism for the tape supported within the cassette, elements relating to the tape drive mechanism being discussed in more detail below. Describe. Generally converter 10
The recording/playback element, referred to as 2, is mounted on the support member 82 by means of a retaining bracket 104, which is secured to the support member 82 by 106, as shown in FIG.

As is well known, the transducer 1020 function records sound onto the magnetic tape when the tape passes through the transducer 102 in one operation, and when the tape passes through the transducer 102 again in another operation of the dictation machine. This is to play back previously recorded sound. Electronic controls for achieving such operation are known and do not form part of the present invention.

As shown in FIG.
It carries a tape drive support consisting of a force 1 cola 108. This roller 108 is supported by a shaft 110,
The bracket 112 is rotatably mounted on the bracket 112 with one end pivoted to the side support 4382 by the pin 114.A protruding piece shown in FIG. The torsion spring 116 that is engaged with the torsion spring 117 is usually
The free end of bracket l-112 is forced against a stop piece 118 formed as one end of support member 82. The bracket is thus normally forced clockwise around the mounting pin 1140. As best shown in FIG. 6, a drive capstan 120 is mounted on frame 12 near pressure roller 108. This drive capstan 12
0 is simply the tip of a shaft 122 mounted within a bearing 124, and this shaft 122 forms part of a cassette mounting drive 58, which will be described in detail later. As can be seen in FIG. 5, when the support member 82 is in the forward position, the pressure roller 108 moves into engagement with the drive capstan 120, causing the tape 1 placed in the cassette 24 to move into engagement with the drive capstan 120.
25 (see FIG. 5) is captured and driven between the pressure roller 108 and the drive capstan 120. pin 114
A spring 116 forcing the bracket 112 clockwise around the periphery of the pressure roller 108 maintains uniform pressure between the pressure roller 108 and the capstan 120 to ensure constant tape drive and Roller 108 and capstan 1
20 is controlled by appropriate selection of spring 116.

As shown in FIG. 1, when the support member 82 is in the forward position shown in FIG. 5, the transducer 102 moves to contact the tape 25. As shown in Figure 2, the cassette 2
4 has a pair of elongated openings 126 through which the tape 125 is pressed by a pair of pressure pads 128. these bad 128 (a kanachinodo 2
4 and attached to a leaf spring 130 suitably mounted within. The cassette 24 has two openings 126 so that the cassette 24 can be inserted into the dictation machine 10 from both sides, and the tape 125 can accommodate a two-round trunk so that the tape 125 can be used in both directions with respect to the cassette 24. There is.

This cassette 24 is the subject of US Pat. No. 888,540 and US Pat. No. 88,539. Although the inventions in these patent applications do not constitute the present invention, the details of this cassette 24 are fully disclosed in these two applications, which may aid in understanding the present invention. However, for purposes of understanding the present invention, it will be appreciated that the cassette 24 is comprised of a pair of opposite parallel side walls 1, as shown simply in FIGS. 2 and 5.
31 (only one of which is shown) and three surrounding end walls 132 (only one of which is shown).

The opening 126 constitutes the main part of the four side walls of the cassette. Cassette 24 also includes an opening 134 through which drive capstan 120 extends when cassette 24 is installed within cassette chamber 22. The tape 125 is held near the outer edge of the aperture 134 by a tape east facing element 136 mounted inside the cassette so that the drive capstan 120 is able to hold the tape 125 when the cassette is installed into the cassette chamber.
5 and opposite pressure roller 108 such that tape 125 is sandwiched between capstan 120 and pressure roller 108 to feed the tape when the part is in the position of FIG.

To ensure that cassette 24 is properly positioned within cassette chamber 22, cassette 24 includes a pair of abutment pieces 138, as shown in FIG. These abutment pieces engage a corresponding pair of abutment portions 140 formed in the frame 12 when the cassette is installed in the cassette chamber 22. A groove 142 is also formed in the end wall 132 on the opposite edge of the cassette from which the opening 134 is provided. This groove 142 inserts the cassette 24 into the cassette receiving chamber 22.
The boss 144 formed on the frame body 12 is received when the frame body 12 is installed therein. Impact piece 118 and impact portion 14,0, groove 142
, boss 144 functions to properly position and align the cassette 24 when it is loaded into the chamber 22, thereby properly aligning the dictation machine drive elements described below to the hob of the tape reel within the cassette 24. bite into.

Still referring to FIG. 5, the cassette 24 has a pair of tape reels 14 mounted therein for proper rotation.
6. One reel is a supply reel and the other reel is a take-up reel, completely dependent on the direction in which the tape 125 is fed. Each reel 146 has a specifically shaped pocket 148 that engages a correspondingly shaped hob 150. Each hob 150 has a pair of cassette drive devices 15, which will be described later.
This serves as the second output driving means.

The main drive device 54 will be described with reference to FIGS. 2.3.4 and 2.3.7. As clearly shown in FIG. 2, the drive is a direct current, reversible, high speed motor 154 which operates normally at approximately 200 Orpm during recording and playback operations and approximately 400 Orpm during fast forward and rewind operations. motor 154
is mounted to the rear end of the frame 12 by a mounting tab 156 that is secured to the frame 12 by a screw 158. A flywheel 160 is mounted on the drive shaft 162 of the motor 154. Also, a small diameter boob IJ 164 is mounted on the end of the drive shaft 162 near the flywheel 160.
6 has been done. A belt 166 extends in front of the dictation machine 10. This bell) 166 passes around a large diameter boot 9168 that pivots on an axis 170. The shaft 170
is attached to the frame body 12 at a position spaced apart by a predetermined ratio N from a drive shaft 162, which will be described later. Another small diameter pulley 172 is rotatably mounted on shaft 1701 and another bell l-174 is threaded around pulley 172 and around another large diameter boob 9176.

This pulley 176 is rotatably mounted on the aforementioned shaft 122 on which the drive gap 120 is provided. As mentioned above, the shaft 122 is mounted 1b1 on the frame 12 in a position such that it aligns with the opening 134 of the cassette 24 when the cassette is installed in the cassette chamber 22. Referring briefly to FIG. 7, another small diameter pulley 180 is rotatably mounted on shaft 122 and another belt 18 is attached.
2 passes around the pulley 180 and around the pulley 184. These pulleys 184 are connected to the cassette drive device 1.
52, these pulleys 184 constitute the main input drive member of the device 152. 2.3.4 and 6 show various parts of the drive train for starting the motor 154 and stopping the pulley 184 described above.

Reference is now made to Figures 8.9.10 and 11. In particular, FIGS. 8 and 9 show details of the force cut drive 152.

Each cassette drive 152 has a one-way clutch and a slip clutch between the pulley 184 and the cassette hob or driver 150. First, let's talk about the one-way clutch. The clutch is shown in FIGS. 8 and 9.

With particular reference to the single cassette drive 152,
A pulley 184 is rotatably mounted on a bearing 186 mounted on the frame 12 by press fitting.

The bearing 186 is covered with a suitable beveled piece 188 to improve the finished appearance.

Within the central bore of bearing 186 is a drive spindle or shaft 190.
is rotatably accepted. The upper end of the shaft 190 is provided with a plastic section 192, preferably an overmolding, for purposes described below. This cuff lunch is provided between the pulley 184 and the lower end of the shaft 190.

A circular cam plate 194 is rotatably mounted on the retainer 195. This retainer 195 is further placed on the lower blade protruding end of the bearing 186 by pressure fitting. The retainer 195 also has a flange to hold the cam plate 194 in the position shown in FIG. As shown in FIG. 9, the cam plate 194 has four arcuate sections 196. A mounting stand 1-198 for the pawl 200 protrudes from this recess 196, and a hole 204 formed on the underside of the pulley 184 allows the screw 202 to be inserted into the hole formed in the mounting stand 198. It is screwed together. In this way Tsume 20
0 is connected to pulley 184.
It is being helped. The other end of pawl 200 is provided with a pin 206 that extends into a cam recess 208 formed in cam plate 194 . This pin 2
06 rotates the pawl 200 in and out in the radial direction with respect to the cam plate according to the rotation direction of the pulley 184. The ratchet plate 210 has ratchet teeth 212 and a boss 214, and the boss 214 allows the ratchet plate 210 to rotate together with the spindle 190.
It is fixed to the lower end of 90. The claw 200 is usually
It is located beyond the 2100゜ ratchet plate,
The end of the catch 200 engages and disengages from the ratchet teeth 212 as noted in FIG. 10.11. A wave washer spring 216 is placed with one side on the retainer 195 and the cam plate 194 and the ground on the shoulder of the bearing 186 to provide a slight resistance to the movement of the cam plate 194 so as to exert a frictional force on one side of the cam plate 1940. There is.

This purpose will become clearer from the description of the operation of the one-way clutch in connection with Jio and FIG. 11.

As shown in FIG. 10, when the pulley 184 rotates counterclockwise in the upward direction shown by the arrow in FIG. Rotates due to the external force of. The outer surface of the internal cam surface 208 slopes inwardly toward the center of the cam plate 194. Therefore, as long as the cam plate 194 remains stationary, the pin 206 moves toward the center of the cam plate 194 due to internal force. At the same time, the pawl 200 moves, and this causes the pawl 200 to move.
engages one of the ratchet teeth 212 formed on the ratchet plate 210. During this movement, the cam plate 19
4 remains stationary by resisting the movement of the cam plate] 94 provided by the wave washer spring 216. This resistance is sufficient to overcome the tendency to rotate the cam plate 194 in either direction without the application of an external force. When the pawl 200 engages one of the ratchet teeth 212, the ratchet plate 210 begins to rotate with the pulley 184 which in turn rotates about the shaft 190. This is because the ratchet plate 210 is fixed to the spindle 190 by the aforementioned pressure. At about the same time, the pawl 200 pin 206 touches the internal cam surface 208 on the cam plate 194.
The cam plate 194 reaches the end of the wave washer 2.
It starts rotating against the resistance of 16. At this time, as shown in FIG. 10, the one-way clutch on the left side of the figure is completely engaged, and at the same time, the - direction clutch on the left side of the figure is completely disengaged.

Referring to the one-way clutch shown on the right side of FIG. 11, when the direction of motion of pulley 184 is reversed as shown in FIG. The pin 206 is rotated to place the pin 206 on the inner surface of the internal cam surface 208.

This inner surface is also sloped relative to the cam plate 1940 radius, which forces the pin 206 and pawl 200 radially outward relative to the cam plate 194 to release the pawl from the ratchet teeth 212. Installing pawl 200 Shurado 1
98 and the cam plate 194 is caused by the arcuate recess 196
permissible. This recess 196 allows pulley 184 and pawl 200 to move in a bowed position a limited distance while the cam plate is held stationary by wave washer 216. This causes the inner and outer surfaces of internal camming surface 208 to act on pin 206 and force the free ends of pawl 200 inwardly and externally to engage and disengage ratchet teeth 212 with the ends of pawl 200, respectively.

As mentioned above, both cassette drives 152 have similar construction and are shown in FIG. 10.11 to show that both operate in opposite directions with respect to locking and unlocking at the same time. It shows.

As shown in FIG. 10.11, when the right clutch is engaged, the left clutch is disengaged, and similarly, when the left clutch is engaged, the right clutch is disengaged. When both clutches are in the disengaged state, the cassette drive is in seven-lead wheeling mode and the tape can be rewound from the cassette reel cooperating with the disengaged clutches at the desired speed jW.

As mentioned above, the cassette latch includes a slip clutch. This clutch allows the hub 150 to drive the wrestler sotrile 146 as previously discussed with respect to FIG. 5 at various speeds even though the pulley 184 provides the cassette drive drive input at a constant speed. This is because as the tape 124 is wound onto one of the reels 146 due to the direction of the tape drive force, the diameter of the reel increases due to tail winding, as shown in FIG. When the tape is driven at a constant speed by drive capstan 120 in cooperation with pressure roller 108, the tape reel 146 on which the tape is wound must be driven at various speeds.

This is to prevent the tape between the reel 146 and the drive capstan 120 from becoming loose. However, when levering from the take-up reel 146, the reel 146 must be driven at a sufficient angular velocity to have a peripheral hub velocity at least equal to the linear velocity of the tape. However, as the tape is wound onto reel 146, the reel is rotated at a progressively decreasing angular velocity by the introducing tape.

This reduced angular velocity is accommodated by a slip clutch.

Of course, this operation of the slip clutch is unnecessary on the tape reel (supply reel) 146 on which the tape is unwound.

This is because the reel is driven in the freewheeling mode as described above when the one-way clutch that cooperates with the reel is disengaged. Thus, the full-force cent drive in cooperation with the supply reel can rotate at the angular velocity necessary to facilitate tape unwinding.

FIG. 12 shows details of the slip clutch. As can be seen, the hub or driver 150 includes a groove 218 extending along its entire length. 8th and] 2
Referring to the figure, this hub 150 rests on a 7' cystic bottom molding 192. This molded body 192 has an elongated cylindrical portion 220 and seven flange 222 expanded in response to an external force.
It has The flange 222 defines a downwardly facing shoulder 224 and an upwardly facing camming surface 226. The hub 150 has a generally annular configuration as shown in FIG. 12 and fits around the cylindrical portion 220 of the plastic molded body 190.

The hub 150 also includes a diagonal cam 228.

- this cam surface 228 is aligned with the cam surface 226 and provides a mutually continuous inclined cam surface 226,228; The purpose of these cam surfaces 226, 228 is to
When loading the cassette 24 into the cassette chamber 22
The goal is to provide smooth alignment. The hub 150 is formed of a somewhat elastic plastic that has moderate rigidity and shape retention.
0 inner surface is slightly smaller than the outer diameter of the cylindrical portion of the plastic molded body 192. When the hub 150 is assembled onto the plastic molding 192, the groove 218 widens slightly so that the inner diameter of the hub 150 matches the outer diameter of the cylindrical portion 220 of the plastic molding 192. The elasticity of the plastic causes the inner surface of the hub 150 to press against the outer surface of the cylindrical section of the plastic molding 1920.

The force of this pressurization is the same as that of the plastic molded body 192! o
c Rotate the hub 150 but be sized to cause slippage between the surfaces if the hub 150 is not brought about by the tape so that it rotates as fast as the plastic molding is being rotated. In this way, the parts slide relative to each other, and the hub 150 is connected to the take-up tape reel 146.
The plastic molded body 192 can be rotated at variable speeds depending on the amount of tape 124 taken up on the spindle 190.
It can be rotated at a constant speed as driven by.

[Brief explanation of drawings]

1 is a perspective view of a small portable dictation recorder embodying the present invention; FIG. 2 is an exploded perspective view of the dictation recorder of FIG. 1, viewed from the opposite side of the position shown in FIG. 1; Figure 3 is an enlarged plan view of the recorder in Figure 1 seen from the back side of the dictation recorder, Figure 4 is a plan view of the recorder in Figure 1 seen from the front, drawn with the same dimensions as Figure 3; Figure 5 is a rough plan view of the front half of the recorder of Figure 1 showing the relative positions of the cassettes in the dictation recorder; 6 is a detailed enlarged perspective view of a portion of FIG. 5, and FIG. 7 is a perspective view of the tape 1 drive extending from the 1 drive motor at one end of the recorder to the tape reel drive near the other end of the recorder. 8 is a sectional view of the tape reel drive device shown in FIG. 7, and is a detailed view of the one-way clutch and slip clutch in each drive device, and FIG. 9 is a sectional view of the tape reel drive device shown in FIG. 8. Fig. 10 is a plan view of the tape reel drive device showing the parts of the one-sided clutch in the tightened position when the drive belt rotates counterclockwise; FIG. 11 is a diagram similar to FIG. 10 showing the positions of parts of the one-sided clutch when the drive belt is rotating clockwise, and FIG. FIG. 9 is a perspective view of one of the slip clutches shown in FIG. 8; Explanation of symbols 10 Dictation recorder 184/Pulley 188 Slope piece 194 Circular cam plate 196... recess
198 Special Edition Stud 200 Tsume
202 Screw 206... Pin 208 Internal force cam surface 210 - Ratchet plate 212 Ratchet tooth 216 Wave washer spring

Claims (7)

[Claims] (1) A tape drive device for a dictation machine, comprising:
A generally rectangular frame body having a substantially large longitudinal and widthwise area; B. A frame body disposed near one end of the frame body for receiving and storing tape cassettes thereon and placing the tape cassettes on the tape storage reel. means adapted to eject a portion of the tape stored in the cassette onto a reel so as to be dynamically exposed from the cassette toward the other end of the frame; tape reel drive means mounted on said cassette receiving and storage means of the frame for selectively driving one or the other tape storage reel when a cassette is positioned within said frame; a drive capstan pivotally mounted on the frame at a first intermediate position so as to contact an inner surface of the exposed portion of the tape when positioned within the frame; and an E recording/regeneration converter. and elasticity) < vine-up roller; 1) the transducer and backup roller contact the outer surface of the exposed portion of the tape so that the transducer selectively records to or plays from the tape and the backup roller is in feed engagement with the drive capstan; a front position where the tape is pressurized;
2) the transducer and bank up roller 71' adapted to move between a rearward position where both the transducer and the bank up roller 71' are out of contact with the tape; multi-stage speed reduction main drive means located between the first intermediate position and the other end of the frame for simultaneously driving the drive capstan and tape reel drive means at uniform speeds; , in which the exposed portion of the tape moves across the transducer and is wound onto one of the tape storage reels at a uniform linear speed when the load support means is in the forward position; Tape drive device for recorder. (2) A main drive means, or a high-speed motor disposed within the frame near the other end of the frame, and a plurality of deceleration boogies disposed intermediate the motor and the tribe carburetor; 2. A tape drive according to claim 1, comprising: . (3) a plurality of reduction pulley devices; a first pair of reduction pulleys disposed between a second intermediate position between the A motor and the drive cab and the motor; , B. A second pair of deceleration boots mounted between the second intermediate position and the tribe cab stern, and a second pair of deceleration booths mounted between the second intermediate position and the tribe cab stern, and the aforementioned boots to allow drive movement from the C motor to the dry cab stan. 3. The tape drive device according to claim 2, comprising: a pair of belts connecting respective reduction booleans. (4) The first pair of deceleration boosters or a relatively small diameter booster mounted on the drive shaft of the motor are rotatably mounted on the frame at the second intermediate position. a large diameter boot mounted on a first shaft, the second pair of reduction boots mounted on the shaft at the second intermediate position. a relatively small diameter bobbin and a ratio I mounted on a second shaft rotatably mounted on the frame at the first intermediate position (and a large diameter bobbin); 4. A tape drive according to claim 3, wherein the drive spindle is a distal end of the second axis AiJ. (5) When the second intermediate position approaches the first intermediate position i (K) relative to the motor, the belt connecting the first pair of deceleration pulleys moves to the second intermediate position. 5. The tape drive device according to claim 4, wherein the pair of deceleration boots is longer than the belt to which they are connected. (6) The tape reel drive means is rotatably placed in the cassette receiving and storage means of the frame body, and when the cassette is placed on the frame body, the tape storage reel of the cassette is rotated. a pair of drive hubs positioned to correspond to the central opening position; B. drive means connected between the pair of drive hubs and the king drive means at the first intermediate position; , the tape and drive device according to claim 1. (7) A drive means connected between the pair of drive hubs and the king drive means at the first intermediate position is rotatably placed on the frame at the first intermediate position. Claims include: a believe pulley having a drive hub; a drive pulley having a drive pulley mounted coaxially with each drive hub; and a belt connecting all of said pulleys. Item 6 includes a self-contained tape drive.