JPS5931134B2 - Auto reverse control device for tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auto-reverse control device particularly suitable for a full mechanical type auto-reverse mechanism in a portable tape recorder such as a cassette type.

As is well known, a tape recorder that enables reciprocating recording or playback is called an auto-reverse device.

In other words, this auto-reverse device can automatically record or play back during the reverse operation without changing the tape loading state or operation section setting state at the end of the tape during the forward operation, making it possible to record or play for long periods of time. This is particularly useful when regeneration is required. However, since conventionally known auto-reverse devices 5 use an electromagnetic switching mechanism such as a solenoid plunger, they are large and heavy, expensive, and consume a lot of power. It had the disadvantage of requiring

Therefore, there is a demand for smaller size, lighter weight, and lower cost10, and portable tape recorders such as cassette type, which are powered by batteries and must reduce power consumption, are equipped with electromagnetic switching devices such as solenoid plungers. It was not possible to apply an auto-reverse device using a mechanism. 15 Therefore, in view of the above points, the present invention provides a portable tape recorder such as a cassette type that can perform auto-reverse purely mechanically without using an electromagnetic switching mechanism such as a solenoid plunger as in the past. It is an object of the present invention to provide an auto-reverse control device for a tape recorder, which is suitable for a full mechanical type auto-reverse device, and in particular allows easy and good control of the auto-reverse operation.

That is, the 25th tri-reverse control device for a tape recorder according to the present invention, when performing one forward and reverse reciprocating auto-reverse by knocking both the forward and reverse playback operators to the operation position, for example, When the playback is finished, the head of the right playback operator is released, and when the left playback is finished, the left playback operator 30 is unlocked.
The device is characterized by an improved configuration in which the corresponding controller is returned to the stopped state each time the operation is completed, so that it is possible to easily determine what operating state it is in from its appearance. . One embodiment will be described in detail below with reference to the drawings.

That is, FIG. 1 shows a top perspective view when applied to a cassette-type tape recorder, and various mechanisms described later are installed in the front and rear, upper and lower, and left and right sides of the main chassis 11, which has a generally U-shaped front. It will be done.

The operating section 12 is installed so as to protrude forward in the figure.
ST for stop and eject from the left end in the illustration.
OP operator 121, REW operator 122 for rewinding, PLAY(R) operator 123 for reverse direction (reverse operation) playback,
REC operator 124 for recording, PLAY [F] operator 125 for forward playback, FF operator 126 for fast forwarding, PAUSE operator 12 for pause.
These valley operators 12 are arranged in the order of 7 so that they can be pressed in the direction of arrow A and can be returned in the direction of arrow A.
1 to 127 are respective operation levers 121a to 12ra.
The valley drive system, which will be described later, can be put into a driving state via the . In this case, each operating lever 121a to 127
A is disposed at the lower part of the chassis 11 so as to be able to slide back and forth in the direction of the arrow A, and is engaged with a known locking mechanism (not shown) to be locked in the pushed-in state by a pressing operation. However, lever 1 of the STOP operator 121
21a is not locked and engages with the locking mechanism in such a way as to release the lever of the other operator in the locked state.
Further, the lever 127a of the PAUSE operator 127 operates independently without engaging with any locking mechanism, and engages with a known push-button mechanism (not shown) disposed at the bottom of the chassis 11. The first pressing operation locks the device in the depressed state, for example, temporarily stopping the reproducing state, and the second pressing operation releases the locked state and causes the device to return to the reproducing state, for example. The valley levers 122a and 126a of the REW and FF operators 122 and 126 function to selectively drive a forward/reverse switching mechanism of a high-speed feed system, which will be described later, to cause the tape to run at high speed in the forward or reverse direction.

In addition, PLAYaO and PLAY(8) operator 123
, 125 selectively drive a forward/reverse switching mechanism of a constant speed feeding system, which will be described later, to cause the tape to run at a constant speed in the forward or reverse direction, and can freely slide back and forth in the directions of arrows A and 125. The head slider 14 is driven to bring the recording/reproducing head 15 mounted on the head slider 14 into contact with a predetermined surface of the tape, and the same pair of pinch rollers 16 and 17 are selectively operated by a pair of later-described pinch rollers 16 and 17. Capstan 18,
19, it functions to be in a reproducing state in the forward or reverse direction. Here, the recording/reproducing head 15 is of course moved up and down with an accurate azimuth angle in order to enable playback (recording) in the forward and reverse directions of tape running, that is, forward and backward movements. 100
The configuration and details of its operation will be described later. By the way, if it is a normal tape recorder, it is only necessary to perform playback (recording) in the forward direction, so of course one PLAY control is sufficient, but in the case of the tape recorder that is capable of auto-reverse, which is the subject of this article, it is possible to perform playback (recording) in the forward direction. Since it is necessary to perform playback (recording) in both directions, two mutually independent PLAY operators for forward and reverse directions are provided.

Here, if only one of the two PLAY controls is operated, playback (recording) only in that direction is possible.
When both are operated at the same time, so-called auto-reverse can be achieved, and in the case of normal playback (recording), it is only necessary to operate the PLAY operator in the forward direction. In addition, the REC operator 124 in the center of the illustration is the PL
When operated in combination with the AY operator, the lever 124a drives the recording system so that recording can be performed in one direction, forward or reverse, or back and forth by auto-reverse.

In this case, a mechanism different from the usual one is used to prevent erroneous erasure, so that there is no contradiction in any recording state, and this will be described later. Furthermore, protruding from the center of the chassis 11 in FIG. 1 are a left reel stand 20 and a right reel stand 21, each of which is connected to an automatic stop mechanism, a reciprocating operation switching mechanism, etc., which will be described later.

In addition, at the rear in the figure, a tape counter 22 connected to the left reel stand 20, a motor 23 serving as a power source for each drive system, and operation levers 24 and 25 for an auto-reverse frequency limiting mechanism and a manual reverse mechanism, which will be described later, are installed. ing.
FIG. 2 is an overall plan view of the tape drive mechanism, with the main chassis 11 removed from FIG. It is characterized in that it is independent from the drive system 400, and as a result, load fluctuations do not directly affect the capstan, making it possible to achieve high performance characteristics such as wow, and also to control the detection part of the automatic stop mechanism 500 to the reel constant. The automatic stop mechanism 500 is the same system as the speed drive system 300.
This makes it possible to simplify the detection section.

That is, the motor pulley 2 supported by the shaft of the motor 23
A large diameter portion of a center pulley 302 is connected to the center pulley 302 via a belt 301, and a right take-up idler 303 is pivotally supported on the small diameter portion of the center pulley 302 so as to be able to move toward and away from the center pulley 302. Here, as will be described later, the right reel stand is connected to the right reel idler 303 via a link mechanism 26 driven by a right play slider 125b connected to a lever 125a of the PLAY operator 125 during right feed. 21, the center tap 302 can be moved in and out at the same time, but the right take-up idler 303 is omitted and the center tap 302 itself is connected to the right reel stand 2 by the link mechanism 26.
It may be arranged so that they are connected to and separated from each other, or furthermore, they may be arranged so that they are interchanged on the left and right. In addition, a left winding pulley is attached to the small diameter portion of the center tap 1J302 via a belt 304 that forms a substantially triangular loop with that portion as one bottom corner. 1J
A cam wheel 306 is provided at 305 and the top corner.

Here, the left take-up pulley 305 is separated from the left reel stand 20 via the operating member 27 driven by the left playback slider 123b connected to the lever 123a of the PLAY9 operator 123 during leftward feeding, as will be described later. It is something that can be accessed freely. Further, the cam wheel 306 constitutes a detection section of the automatic stop mechanism 500, and in this case, it can detect that both the left and right reel stands 20, 21 are in a stopped state, but details regarding this will be described later. do. Further, in FIG. 2, the capstan drive system 400 includes a pair of left and right flywheels 401, 402 of a so-called anti-rolling type and a guide pulley 1J403 connected thereto by a belt 405 via a motor pulley 1J231.

Here, in the center portions of the left and right flywheels 401 and 402, there are a pair of left and right capstans 18 and 19, respectively.
will be provided. The details of the forward/reverse switching mechanism 600 of the constant speed feed system and the forward/reverse switching mechanism TOO of the high speed feed system shown in FIG. 2 will be described later. It oscillates within a small range. In this state, if the end of the tape is reached and the right reel stand 21 stops, the clockwise biasing force on the right detection lever 502 disappears.
As shown in FIG. 3e, the detection lever 502 stops at the position where it is pushed counterclockwise. Then, the next rotation of the cam wheel 306, which rotates independently of tape running, engages the outer protrusion 306b of the cam wheel 306. By the way, in this type of automatic stop mechanism, conventionally, the end of the tape has been detected by utilizing the fact that the detection lever itself is moved by the protrusion of the cam at this point.

However, the above-mentioned cam wheel 306 is a cam lever 50.
cam wheel 3 by being pivoted to one end of 4.
06 itself rotates clockwise in the drawing by its own rotational force in a so-called planetary motion.

As a result, the gear mechanism 505, which is engaged with the other end of the cam lever 504 via the torsion spring 505a, meshes with the gear 302a provided in the small diameter portion of the center tap 1J302. Here, the gear 302a is directly connected to the motor 23, and the so-called auto-shut-off (
ASO) is the drive source for the operation, and the gear mechanism 50
The meshing relationship with 5 and its operating state are shown in FIGS. 3 f to j. That is, the gear mechanism 505 engaged with the cam lever 504 is composed of gears A, B, and C that are meshed with each other, and gear A is meshed with the center pulley gear 302a to transmit rotational force. .

Then, gear B is rotated via a small gear coaxially integrated with gear A, so that fan-shaped gear C is rotated via a small gear coaxially integrated with gear B. By this, the fan-shaped gear C
The pin 506 provided in the lock mechanism is finally rotated clockwise to move the release slider 507 downward in the figure as shown in FIG. to stop the tape recorder. In this way, the automatic stop operation can be performed. In the above process, the cam lever 504 is rotated clockwise, and then the pin 506 at the other end is moved to the release slider 507.
The cam wheel 306 is stopped at the position where it touches the cam wheel 306.
is in a waiting state at that position (FIG. 3e) due to the slip of the belt 304.

Then, in this state, when the release slider 507 starts to move as described above (this is because the gear C is a fan-shaped notch gear, so there is a difference in the operation timing), the cam lever 504 moves further clockwise. Since it is rotated, the cam wheel 306 also moves in the same direction. As a result, the outer protrusion 306b of the cam wheel 306 becomes inclined in its engagement with the dressing pin 503, so that the dressing pin 503 automatically disengages from the protrusion, thereby causing the cam wheel 306 to Due to its own rotational force, it now rotates counterclockwise and returns to its original position (Fig. 3d). Note that if the tape is in the left feeding state (Fig. 3b), the left reel stand 2
0 rotates clockwise as shown by the arrow in the figure, the left detection lever 501 that engages with the friction plate 202 is constantly biased to rotate counterclockwise. One end of the bottom surface of the right detection lever 502, which is loosely connected during rightward feed travel, is brought into a connected state, and a bias is applied so that the right detection lever 502 is eventually rotated clockwise at all times in the same manner as described above.

Therefore, from this point on, the auto-shutoff operation can be performed in a similar manner to the time of right-hand feed travel described above. According to the automatic stop mechanism 500, the engagement between the right detection lever 502 and the cam wheel 306 is automatically disengaged by the rotational force of the cam wheel 306, which is necessary for conventional automatic stop mechanisms of this type. Not only does it eliminate the need for the above-mentioned disengagement member, but it also provides greater flexibility in the arrangement of the drive source for auto-shutoff operation, the detection lever, etc., and the detection lever can be fixed to the shaft, improving accuracy. This is preferable and can make the operation more stable.
In addition, since the cam wheel 306 constituting the detection unit is rotated together with the reel constant speed drive system 300 by a single belt, it is possible to commonly detect the stoppage of either the left or right reel stand 20, 21. This is advantageous in terms of simplification and space factor. Note that the above explanation assumes that the auto-shut-off operation is performed only at the end of the tape, but
Even if the tape gets tangled, it can perform an auto-shutoff operation to protect the tape and each mechanism.

Next, to explain the auto-reverse relationship, Fig. 4a
1 and 2 show the auto-reverse drive system section taken out from FIG. The left and right playback sliders 123b, 125b that control the take-up idler 303 and the head slider 14 are connected to springs 123c, 125.
c.

Here, the levers 123a, 125a are moved by guide pins 123e, 125e engaged with the guide portion at the front end of the main chassis 11 shown in FIG. 1 and their own long holes 123d, 125d shown in FIG. It is designed to be able to freely slide back and forth in the direction of the mouth (the same applies to other levers not shown). The head slider 14 and the left and right playback sliders 123b and 125b also have long holes 14a and 14b, respectively.
Guide pins 14c, d, 123g on 123f, 125f
, 125g are engaged, thereby making it possible to freely slide back and forth in the direction of arrow A. By the engagement by the springs 123c, 125c mentioned above and the engagement between the bent pieces 123x, 125x of each regeneration lever 123a, 125a and the valley engaging portions 14x1, 14x2 of the head φ rider 14, it is possible regeneration lever 125a,
When the head slider 123a is operated, the head slider 14 can be driven, and the left or right playback sliders 125b and 123b on the corresponding side can also be driven. In addition, the operation unit 1 used in this type of tape recorder
In this case, the second lock mechanism is one operating lever 123a.
Alternatively, the other operation lever 1 can be locked at the same time as the lock 125a, or at approximately the same time even if there is a slight time lag.
25a or 123a can be locked without releasing the lock of the former, and furthermore, it is also possible to lock the operating lever 124 for sweat recording together with these locks.

Therefore, assuming that auto-reverse (regeneration) is currently being performed, the forward and reverse operation levers 123a and 125a are connected to both PLA.
Y8, V) If it is locked by pressing the controls 123 and 125, both the left and right playback sliders 123b and 125b move in together and enter the driving state, as shown in FIGS. 4A and 4b. Since it is placed in a position facing one end of a reverse lever 605 which is rotatably supported in a substantially L-shape from a position facing the plate release part 130, the automatic shut-off operation as described above is not performed. Next, rotate the reverse lever 605 clockwise.

As a result, the other end of the reverse lever 605 engages with the one end 603c of the gear lock lever 603 and rotates it counterclockwise.
04a, and move the reverse drive lever 601, which cooperates with the gear mechanism 604 as will be described later, to the upper left position as shown in FIG. 4c (this is referred to as the second position). to be transferred to Here, reverse drive lever 6
01 and the reverse gear mechanism 604. The reverse gear mechanism 604 has a pin 604b that engages with a long hole 601a formed at the right end of the reverse drive lever 601, and a reverse gear A6O4c having the aforementioned cam portion 604a. and a reverse gear B6O4e which is coaxially integrated with a small gear that meshes with this gear A6O4c and has a notch 604d in a part, and normally (when the reverse drive lever 601 is in the above-mentioned first or second position) (including when in a regeneration state in a predetermined direction), the reverse gear B6
The notch 604d of O4e is the center pulley gear 30.
2a, both gears 604e, 3
02a does not mesh (this is the case).

In this state, when the end of the tape arrives and the gear lock lever 603 is disengaged from the gear mechanism 604, the reverse drive lever 6
01 rotates reverse gear A6O4c slightly counterclockwise, and as a result, gear B6O4e also rotates in the opposite direction, so gear B6O4e
and the gear 302a come to mesh with each other. Then, if the center pulley gear 302a rotates regardless of the tape running, the rotation is transmitted to the gear mechanism 604 since it serves as a driving source for this auto-reverse action as well as for the automatic stop action. The reverse drive lever 601 is moved from the state shown in FIG. 6B to the state shown in FIG. By setting the gear ratio of the gear mechanism 604 appropriately, the reverse drive lever 6
When 01 moves to the second position, reverse gear B6 is switched again.
The notch 604d of O4e is the center pulley gear 302a
The two gears 604e and 302a are brought to their original state in which they do not mesh with each other.

In this way, when the reverse drive lever 601 reaches the second upper left position, the reverse drive lever 601
The left playback slider 123b, which had been blocked at the left end of the slider 1, is allowed to enter, and the left playback slider 123b, which was blocked at the left end of the playback slider 123b, is moved to the left, that is, the playback state is in the reverse direction, as shown in FIG. 4c.

In this case, as the reverse drive lever 601 is moved from the first position to the second position, the right regeneration slider 125b, which had been in the advanced state, moves to its locking portion 1.
25b-2 is pressed by the left end of the reverse drive lever 601 and returned downward in the figure, and is in a standby state. Also,
At this time, the operating member 2 had fallen into the tip key-shaped portion 123b-1 of the left playback slider 123b, which was allowed to enter.
7 is released and rotated in the direction of the clockwise biasing force by the spring 27a, the left take-up pulley 305, which had been in the detached state, is brought into contact with the left roll base 20, and the left take-up pulley 305, which had been in the detached state, is brought into contact with the left roll stand 20, and the left This is a feed run, that is, playback in the reverse direction. When the end of the tape arrives in such a reverse direction playback state, the detection section of the automatic stop mechanism 500 is activated again, so that the reverse playback state is switched from the forward playback state to the reverse playback state as described above. From then on, unless the STOP operator 121 is operated to stop the tape recorder, the forward ← reverse playback state will be repeated any number of times. It becomes like this. Therefore, the so-called full
The mechanical type can perform auto-reverse using the reverse drive lever 60, which directly switches from normal to reverse playback state.
1 and a reverse gear mechanism 604 that cooperates with the forward/reverse switching mechanism 600 of a constant speed feed system, and the rotational force from the motor 23, which is an essential drive source for the tape recorder, is used as the switching drive source. Center pulley gear 302a
selectively transmits the signal to the reverse drive lever 601 to set the first and second positions in which one of the playback sliders 123b or 125b is in the driving state and the other playback slider 125b or 123b is in the standby state. This fully mechanical type auto-reverse device corrects the drawbacks of conventional electromagnetic switching mechanisms such as solenoid plungers, and is suitable for use in force-set type portable tape recorders. I understand that there is something.

In addition, such an auto-reverse device is a 2P
Since it uses the LAY button method, it also has the advantage of being able to perform normal one-way playback in any direction. Next, in the above, both PLAY
To explain the right feed priority mechanism that gives priority to right feed travel when the (R) and [F] operators are operated at the same time, this mechanism always keeps the reverse drive lever 601 in the same position when stopped, as described above. This can be achieved by setting it as follows. That is, this is Fig. 4 a-
C, Reverse drive lever 601 shown in Fig. 5A, b
This is achieved by the engagement/disengagement relationship between a constant speed forward/reverse switching mechanism 600 including a gear mechanism 604 cooperating with the power leaf switch 701 and a switch slider 702. Here, the switch slider 702 is the STOP operator 121.
It is driven in conjunction with all the other operators except the PAUSE operator 127 to close the power leaf switch 701 and take charge of supplying power to the motor 23. As described above, auto-reverse is performed by allowing one of the left and right playback sliders 123b, 125b to enter and blocking the other from entering, but both PLAY (8), (fl) operators 123,
125 at the same time, the timing at which one end 603a of the gear lock lever 603 engages with the cam portion 604a of the reverse gear mechanism 604 is earlier than the timing at which the left and right reproduction sliders 123b, 125b engage with the reverse drive lever 601. Therefore, if the reverse drive lever 601 is in the first position upward to the right as shown in FIG. 6B, it will not be engaged with the power leaf switch 701 and will continue to move to the right as described above. On the other hand, if the reverse drive lever 601 is at the second upward left position shown in FIG. When the switch slider 702 returns and leaves the power leaf switch 101, the reverse drive lever 601 is struck by the elasticity of the power leaf switch 701 itself, and the reverse drive lever 601 moves to the upper right corner shown in FIG. The power remains on until it flips to the 1 position. Therefore, both PLAY(R), [F] operators 1
If 23 and 125 are operated at the same time, priority will be given to right feed travel at any time. Such a right feed priority mechanism is normally performed in a state where the tape is loaded in the right direction, that is, in the forward direction.
When performing auto-reverse operation, both P
Since the LAYaO, [F] operators 123 and 125 are normally operated at the same time, rational operations are possible without being affected by this assumption.

Moreover, such a right feed priority mechanism does not require any additional special parts, and does not utilize the inertia of the flywheel, etc., so it is possible to easily and reliably give priority to the feed without increasing the size of the flywheel. It has the characteristic of being able to perform actions. Note that in the above explanation of the auto-reverse relationship, only playback was explained, but the REC operator 124 is connected to both PLAY8,
Of course, if you operate it together with 5, you can perform back-and-forth recording with auto-reverse.

By the way, when performing such auto-reverse recording, unlike the above-mentioned auto-reverse playback, it is rather inconvenient because the recording is repeated many times.

In other words, when performing auto-reverse recording, it is convenient to limit the recording to one trough in the forward and reverse directions, that is, to perform only one round trip recording. Further, when auto-reversing is desired, it is necessary to limit the number of times of reversal not only during recording but also during playback.

That is, there are cases where the user wants to perform only one round trip playback from the beginning, or where he wants to perform autoreverse playback several times and perform autoreverse playback only once before stopping. Here, a reverse number limiting mechanism is required to limit the number of auto reverses when required by external operation. Therefore,
Next, to explain the reverse number limiting mechanism provided for this purpose, the operating lever 24 shown in FIG.
By rotating the limit lever 124c clockwise in the drawing, the limit lever 124c, which is rotatable in a substantially L-shape, is rotated in the same direction via the wire rod 801. Then, the fifth
As shown in Figure a, the limit slider 124b is released from the previous position restriction by the limit lever 124c and is biased to the left in the figure by the spring 124d. Since one end of the reverse valley 605 is engaged with 124b-1, the position is regulated while maintaining a biasing force in the left direction. In this way, the forward playback or recording state similar to the forward playback described above progresses, and when the automatic stop mechanism 500 is activated at the end of the tape and the reverse lever 605 is rotated clockwise, the above-mentioned In this way, the right playback slider 125b is finally moved back to the standby state, and the left playback slider 123b is moved in to switch to the leftward running, ie, the reverse playback or recording state, as shown in FIG. 5B. Here, right play slider 1
The proximal pin portion 12 of the limit slider 124b is biased to the left in the concave portion 125b-3 during the retraction process of the limit slider 25b, and is slidable in the left-right direction in the drawing.
4b-2 is depressed to prevent the right playback slider 125b from being entered again. At the same time, while holding the reverse lever 605 in the clockwise direction, the other end rotates the gear lock lever 603 in the counterclockwise direction shown in the figure, and the automatic stop select lever 509 is moved to face the lock release part 130. By rotating the tape to this position, the automatic shut-off operation by the automatic stop mechanism 500 is performed when the tape reaches the end of the playback or recording state in the reverse direction. This can be used for playback or recording.This makes it possible to prevent double or more erroneous recordings (erroneous erasures), especially in the case of recording, as well as reverse playback if necessary. It is possible to limit the number of reverses, and since such a mechanism for limiting the number of reverses only requires adding a simple mechanism to the above-mentioned full mechanical type auto-reverse device, it can be used as an accessory device for the auto-reverse device. This is suitable.
That is, only when the operation lever 24 of the reverse number limiting mechanism is operated, the number of reverses is limited both during recording and during playback. In other words, even when recording, lever 2
As long as you do not operate 4, permanent auto-reverse is possible, so if you want to record only the most final information, you can do it, but you can set the number limit or permanent auto-reverse depending on the various uses. It is convenient because it can be used for different purposes.

Furthermore, this reverse number limiting mechanism can perform the number limiting operation even when a manual reverse operation lever 25, which will be described later, is operated, that is, even when the manual reverse is in the middle. In either case, the final result is the same form as right → left → stop or left → right → left → stop (when the reverse direction PLAY (R) operator 123 is operated with priority). Since it stops, it is easy to determine what state it is functionally in. However, RE
C operator 124 to both PLAY(R), [F] operator 12
When operated together with 3 and 125, that is, when performing auto-reverse recording, 1 is automatically set to 1 without operating the operating lever 24 of the reverse number limit mechanism as described above from the outside.
It may be more convenient to prevent erroneous recording, that is, erroneous erasure, by limiting the number of reverses, such as by performing round-trip recording.

Therefore, next, for auto-reverse recording, the REC operator 124 and both PLAY (10, [F] operators 123, 12
5 are operated together (provided that the right feed is given priority), a mechanism that automatically performs one round trip recording will be explained. That is, in this case, as shown in FIG. 8a, the reverse lever 605 is activated when the tape end is detected.
A limit slider 124b' is provided so as to be slidable in the horizontal direction in the figure so as to serve as a stopper for the right playback slider 125b, which enters during rightward feed and retreats during leftward feed, and the operating lever 124a of the REC operator 124. Further, a biasing force is applied to the right side in the drawing by the spring 124d'. In this case, the stopper function for the former two is the limit slider 124b in FIG.
This is the same as in the case of , but the operation lever 124a of the remaining REC operator 124 is operated by dropping the tip pin 124B of the limit slider 124b' into the recess 124A formed in the lever 124a. . In other words, the limit slider 124b, whose position was restricted by the reverse lever 605 during rightward recording and could not slide to the left in the figure, is regulated as described above when detecting the end of the tape during rightward recording. Release the control lever 124a of the REC operator 124 by sliding it to the left in the figure.
The tip pin 124d is depressed into the recess 124c. This keeps the limit lever 605 from rotating clockwise as described above.
Thereafter, as shown in FIG. 8B, by performing an auto-shut-off operation at the end of the tape during leftward feeding, recording can be limited to one round trip from right to left. In this case, the limit lever 605 operates in the same manner as described above to switch from right feed to left feed and perform an auto-shut-off operation at the end of the left feed tape. According to such an automatic number limit mechanism during auto-reverse recording, it is possible to easily and reliably prevent erroneous recording. Next, the manual reverse operation mechanism will be explained. When the tape is running in a certain direction with auto reverse set, it waits until the end of the tape is reached and the detection part of the automatic stop mechanism 500 is activated. This is a device that reverses tape running at any point without having to do so, and this is useful in many ways in actual auto-reverse use.

For example, when music is being played on one track of a tape using auto-reverse, it may be desired to play the song on the other track without listening to the next song. Also, when recording with auto-reverse, the end of the tape is almost reached, and if left as is, the tape will be transferred to the leader tape during recording, and recording will continue until it is reversed to another track. If this is not possible, by switching to another track in advance, you can record valuable information without making any mistakes. As described above, such a manual reverse operation mechanism can be operated manually from the outside by operating the forward/reverse switching mechanism 600 of the constant speed system equivalent to the activation of the detection part of the automatic stop mechanism 500 at any time. As long as it can be operated, a wire rod 901 connected to the operating lever 25 is connected to one end of the gear lock lever 603, as shown in FIG. 4a, and the operating lever 25 can be operated. Therefore, the engagement with the cam portion 604a of the reverse gear mechanism 604 may be released by rotating the gallo lever 603 counterclockwise in the drawing. This allows the tape running direction to be easily and reliably reversed at any time. Next, the head moving mechanism 100 will be explained. As shown in FIGS.
By engaging the lower end and the recessed part 101a at the tip,
The first and second reverse drive levers 601
A head switching slider 10 that is slidable in the left-right direction so as to take a right-side position or a left-side position corresponding to the position of
1 is provided.

Here, the head switching slider 101 is connected to the sub chassis 1.
The guide pin 11b and the click ball 11c provided in the head slider 1a are respectively engaged with the elongated hole 101b and the positioning square hole 101c or 101d, and are not directly connected to the head slider 14 described above. Not related. However, a head mount plate 14 is attached to the head slider 14 via an appropriate number of supports 14a and has erasing heads 151 and 152, which will be described later, at both ends.
a head switching lever 14 rotatably supported relative to b;
The head switching lever 14c has a substantially U-shaped side surface, and one end of the head switching lever 14c is engaged between the two wire-like engaging members 101e supported at the tip of the head switching slider 101, thereby being loosely engaged with the head switching lever 14c. The head gripping member 14d converts the horizontal sliding movement of the head switching slider 101 into vertical movement of the recording/reproducing head 15, and is independent of the longitudinal sliding system of the head slider 14. The head gripping member 14d grips the head base plate 15a supporting the recording/reproducing head 15 at one end thereof, and in this case, as shown in FIGS. 7C and 7D, the head base plate 1
5a, two upper receiving pins 102 and two lower receiving pins 103 from the head mount plate 14b or head slider 14 side, and one upper azimuth adjustment screw 1 each.
04 and the lower azimuth adjustment screw 105 are provided so as to engage with each other, positioning for vertical movement is performed, and each of the upper and lower azimuths at that position is set to an optimal state. That is, each upper and lower receiving pin 102
, 103 each have a tapered tip and a stepped portion, and engage the head base plate 15a with its engagement hole 15b or 15c to guide the head base plate 15a to move up and down correctly. It is used for positioning. Further, the upper and lower azimuth adjustment screws 104 and 105 are set in advance via springs 106 and 107 so that the head base plate 15a, which has been positioned vertically, is adjusted so that the azimuth of the recording/reproducing head 15 is in the optimum state in the upper and lower directions, respectively. This is for independent adjustment between the two. FIGS. 7C and 7d show that the reverse drive lever 601 is in the second position.
, the recording/playback head 15 is placed in the first position.
This shows the case where the tape is moved to the left and then to the right by moving downward. Further, FIGS. 7E and f show the right-hand feed when viewed from the side, that is, the state in the middle when the recording/reproducing head 15 is moved downward, and the state at the stop position, and the same figures G and h show the left-hand feed, that is, the state in which the recording/reproducing head 15 is moved downward. It shows the state in the middle when the head 15 is moved upward and the state at the stopped position. The sub-chassis 11a is provided with a switching spring 108 supported on a head switching slider 101, so that when the head 15 moves up and down, the sub-chassis 11a is connected to the L and R channels of the stereo tape when the head is a stereo head. A head changeover switch 109 is provided to change over the heads and also to change over the erasing heads 151 and 152, but the former is not necessary when used only with monaural tapes. According to the above-described head movement mechanism, in an auto-reverse system that performs reciprocating recording or playback by running the tape in forward and reverse directions, the azimuth is adjusted in advance independently of each other in response to discrepancies in tape running during reciprocation. Since the azimuth can be adjusted, it is possible to achieve the optimum azimuth for both, compared to conventional fixed heads that can only accommodate one side.
The recording/playback head itself may also be a conventional one, which is particularly expensive.

Additionally, in the past, there have been devices of this type that use four adjustment screws or use a solenoid plunger to adjust the azimuth at three points, but in these cases, the former method is extremely difficult to adjust. However, in the latter case, it was not possible to solve the wobbling on both sides of the head, but with the above structure, the head base plate 15 is connected to two taper pins and one azimuth pin. Since it is supported at three points on both the upper and lower sides by adjustment screws, it is stable without tilting, and the taper pin fits into the engagement hole of the head base plate to guide and regulate the position, so it can be easily adjusted on both the left and right sides. It can eliminate sagging. That is, in all of the above-mentioned conventional devices, since only four or three points are brought into contact with a coplanar surface, lateral tilting and wobbling remain. By the way, in the head moving mechanism 100 as described above, the pair of left and right erasing heads 151
, 152 itself is a fixed type (in this case, the valley head surface corresponds to the upper or lower position), but in reality, in order to increase the erasure rate during auto-reverse (recording), the erase head is fixed relative to the tape surface. It is desirable to satisfy the contradictory demands that the amount of thrust of the erasing head must be reduced in order to improve the wow characteristics, while it is necessary to increase the amount of thrust.

Next, a mechanism for controlling the amount of thrust of the erasing head that can satisfy such requirements will be explained. As shown by the two-dot chain line in FIGS. A generally inverted T-shaped erase head base plate 14f is provided to be rotatable about a pin 14e provided between the head slider 14 and the like, and erase heads 151, 152 are provided at both ends of the upper side of the erase head base plate 14f.
A spring 1 is attached to the pin 14e and is engaged with the pin 14e.
4g is engaged with the lower end of the reverse drive lever 601. As a result, the erasing head base plate 14f moves clockwise (FIG. 9a) or counterclockwise depending on the first and second positions of the reverse drive lever 601, regardless of the head slider 14 or the head mount plate 14b. Since it is rotated in the direction shown in FIG. 9b, the erasing head 151,
The amount of thrust of the head 152 into the tape T is made smaller on the downstream side with respect to the recording/reproducing head 15 than on the upstream side. In other words, for example, when feeding to the right, the plunge amount of the left erase head 151 is made larger than that of the right erase head 152 by a predetermined amount to fully satisfy the erase rate, and the downstream side, which is a major cause of wow, can be It is now possible to reduce the load and improve the wah characteristics, and the same effect can be obtained even when moving to the left, with the exact opposite relationship. Note that 14h in FIGS. 9A and 9B is the erase head base plate 14f.
A stopper 141 is brought into contact with the spring 14g to restrict the amount of rotation of the erase head, and a stopper 141 engages with a recess 14j at the lower end of the erasing head base plate 14f to slide the head switching slider 101 in the left-right direction. This is an engagement member for making the connection.
In this case, if the amount of rotation of the erase head base plate 14f is increased so that the erase head on the unused side is moved back greatly, it is possible to use a magnetic erase head which can be made cheaper than an AC type erase head. be. Next, to explain the erroneous erasure prevention mechanism, FIG. 10a shows the erasure prevention mechanism taken out from FIG.
The operating lever 124a of the EC operating element 124 has locking portions 124n and 1240 formed at its rear end so as to protrude left and right.

Approximately crank-shaped left or right claw detection levers 124f, 124g are engaged with these locking portions 124n, 1240 at one end and biased counterclockwise or clockwise by springs 124p, 124q. is rotatably provided. In addition, these detection levers 124f,
124g is connected via wire rods 124h, 1241 to left and right recording prevention levers 124j, 124k which are rotatably supported alternately. Further, locking members 1241 and 124m are provided which are rotatable left and right so as to sandwich the other ends of these recording prevention levers 124j and 124k. Here, the locking members 1241 and 124m correspond to locking portions 123b-5 and 125b- formed at corresponding portions of the left and right reproduction sliders 123b and 125b. In the figure, Wl and W2 are force setting tapes (CT)
A pair of left and right detection windows are formed at the rear of the case. If the REC operator 124 is operated to enter the recording state and the lever 124a is pushed into the position indicated by the two-dot chain line in the figure, the locking portions 124n, 12 of the lever 124a
The left and right claw detection levers 124f and 124g, whose positions were restricted by engagement with the levers 40, are now free to rotate in the respective biasing force directions. And each of these detection levers 124f, 12
Each end of 4g is the detection window W of the force setting tape (CT).
An attempt is made to enter W2, but if the detection window W,, W2 is blocked by a so-called accidental erasure prevention claw, the entry is blocked, and on the other hand, if the claw is cut off, entry is allowed. , the amount of rotation increases. Then, since the left or right prevention lever 124j, 124k, whose large amount of rotation is transmitted through the rod 124h or 1241, is rotated, the locking lever 124j, 124k, which is engaged in a clamping manner at the other end thereof, The member 1242 or 124m is moved from the position shown by the solid line to the position shown by the broken line. As a result, the locking member 1
241 or 124m and a corresponding locking portion 123b-5 or 125b-5 of the left and right playback sliders 123
b, 125b, one or both of them are prevented from entering (equivalent to no claw) or allowed to enter (equivalent to having a claw), and in either case, the side without the accidental erasure prevention claw is It is possible to prevent recording, that is, erroneous erasure. In other words, this method prevents accidental erasure, but unlike normal ones, RE
The C operator can be operated at any time regardless of the presence or absence of the accidental erasure prevention claw, and the PLAY operator on the side without the claw cannot be operated. As a result, even if the force setting tape is one-sided, the force setting tape can be loaded in reverse and recorded without reversing the loading process.
In this case, the REC operator 124 is placed in the center, and the left and right PLAY8, [F] operators 123, 125 are placed on both sides of the REC operator 124.
Since the configuration is such that the corresponding relationship with the force setting tape is easy to understand and operations are easy to perform, the entire accidental erasure prevention mechanism is symmetrical, which is advantageous in terms of design and manufacturing (especially molds, etc.). Become. The above-mentioned accidental erasure prevention mechanism is preferable because the detection lever is retracted when the tape recorder is stopped, so the force setting tape can be easily attached and detached, and is suitable for ordinary tape recorders that do not have an auto-reverse device. The same can be said when one half of the above-mentioned mechanism is applied to prevent normal erroneous erasure.

Also, in this case, a degree of freedom in design is ensured, and is particularly suitable for an upright tape recorder. Next, to explain the forward/reverse switching mechanism ROO of the high-speed feeding system, FIG. 11a shows the forward/reverse switching mechanism section of the high-speed feeding system taken out from FIGS. Engagement portions 122b protrude inside the valley operating levers 122a, 126a of the operator 122 and the FF operator 126
, 126b, and is rotatably supported approximately at the center thereof, and is engaged with one end of the idler support lever Fl3 at its upper end via a spring mechanism Fl2. be done.

At the other end of this idler support lever Fl3 are the pair of left and right flywheels 401, 402 and the reel stand 20.
, 21, there is provided a high-speed idler Fl4 that can selectively adjoin these. Therefore, as shown in FIG. 11b, for example, the lever 12 of the FF operator 126 is now
If 6a is pushed in as shown by the arrow, the engaging portion 1
26b engages with a corresponding end of the switching lever Fll to rotate the switching lever Fll counterclockwise. Then, since the idler support lever Fl3 is rotated clockwise via the spring mechanism Fl2, the high-speed idler Fl4 comes into contact with both the right flywheel 402 and the right reel stand 21, causing high-speed feed in the right direction, that is, fast feed. The state is realized. In this case, the right direction PLAY [
F]) When the operator 125 is operated and the FF operator 126 is operated while playback in that direction is being performed, the other end of the switching lever Fl1 switches to the high speed slider Fl5.
In order to engage with the head slider Fl5 and push it back in the direction of the arrow in the figure, the tip engaging portion Fl6 of the high-speed slider Fl5 is engaged with the head slider 14, which is pushed from the position indicated by the broken line (when stopped) to the position indicated by the solid line in the figure. Since the joining part 14k is pushed back slightly toward the front, a so-called "key" operation is possible. In addition, when the operating lever 122a of the REW operator 122 is operated alone or in combination with the PLAY9 operator 123 on the left side, it can operate in the opposite manner to the above and enter the rewind state or the review one state. be. According to such a forward/reverse switching mechanism for a high-speed feed system, each mechanical part including the operator is left-right symmetrical, and the same high-speed idler can be used for both fast-forward and rewind, and the torque can be regulated at one location. It has the advantage of being easy to use.

In addition, conventionally when using this type of device, two dedicated switching levers are used for each operation, but it can be done with a single switching lever as described above. . Furthermore, since a single switching lever is used, erroneous operations such as simultaneous operation of the FF and REW operators are prevented, thereby protecting the tape and each mechanism. Next, to explain the features of the operating mechanism that enables the auto-reverse function as described above, as explained in FIG.
With PLAYCB in the center, left and right PLAYCB), (
IS) Operators 123 and 125 are arranged, and REW and FF operators 122 and 126 are further arranged on both sides thereof.

As mentioned above, this makes the forward/reverse switching mechanism and the accidental erasure prevention mechanism of the high-speed feed system symmetrical, which is advantageous in terms of design and manufacturing, and also makes it easier to understand and operate the function. It has an organic and rational arrangement of operators. Regarding the arrangement of the REC operator and the left and right PLAY [Yes] and [F] operators,
As shown in Figure 10b-e, the width of the REC control element can be narrowed, its shape can be made into a T (1) shape, and the left and right PLA
If you straddle the Y (R) and (generation) controls, you can use the so-called one-touch method by pressing the inside of the broken lines shown in the diagram for each purpose on these three controls or two adjacent controls. Since it can be operated, auto-reverse recording or playback or desired unidirectional recording or playback can be performed more easily.

Next, a description will be given of a tape running display structure suitable for a tape recorder equipped with an auto-reverse device as described above.As shown in FIG.
1 is connected to a pulley Dl2 via a belt Dll.

This pulley 1JD12 is integrally formed with a display panel Dl3 having a striped portion Dl3a on the upper part, and an axis Dl3 is formed at the center of the display panel Dl3.
A shaft Dl4 supported by l4 but extending from the display panel Dl3
is engaged with the friction plate Dl5 at its tip. Here, the friction plate Dl5 has a substantially pot-shaped shape, and two triangular through holes Dl5a, the tops of which are opposite to each other, are provided near the periphery of the large interior of the friction plate Dl5.
Dl5b, and a long hole D near the periphery of the small inside.
l5c is formed, and the axis Dl is formed at the center of the large interior.
At this time, a stopper Dl7 and a retaining ring Dl8 are applied from above so that a braking force is applied by a compression spring Dl6 for torque adjustment. A display window D2l is formed in the upper tape recorder casing D2O, which corresponds to the approximate middle part of the triangular holes Dl5a and Dl5b of the friction plate Dl5. If the left or right hand wheel bases 20, 21 are rotating in either direction, the rotational force is transmitted to rotate the display panel Dl3.Accompanying this, the friction plate Dl5
also tries to rotate, but the long hole Dl5 inside the small
Since the stopper Dl9 is engaged with the end of the elongated hole, the slip is restricted at the position where the stopper Dl9 contacts the end of the elongated hole. The position of this slip is inside the large part of the friction plate Dl5 (
It is assumed that either of the two triangular holes /Dl5a or Dl5b is set in a positional relationship opposite to the display window D2l of the tape recorder housing D2O. Then, from the display window D2l, the striped portion Dl of the display panel passes through either triangular hole Dl5a, Dl5b of the friction plate Dl5.
The rotation state of 3a is the rotation direction of the reel stand 20 or 21 (
It is observed as shown in FIGS. 12b to 12e depending on the tape feeding direction) and its rotational speed (constant speed or high speed). That is, B and c are in the right-forward playback and left-forward playback states, and the interval between the striped portions Dl3a is relatively wide, that is, the movement of the striped portion Dl3a is slow, and D and e are in the fast-forward FFl rewind RE.
In the W state, the interval between the striped portions Dl3a is narrow, that is, the striped portion D
I can see the movement of l3a quickly. In this case, display window D2
Triangular hole Dl5a or Dl of friction plate Dl5 visible from l
Since the direction of the top of 5b indicates the tape feeding direction, the feeding direction and whether it is constant speed or high speed can be easily identified together with the state of the striped portion Dl3a mentioned above, and it is also possible to see what state it is in. I can know. Furthermore, the rotational speed of the reel stand 20 or 21 changes depending on the amount of tape wound, and since the movement of the striped portion Dl3a follows this, it can also be used as a guide for knowing the amount of tape (remaining). Of course, when performing stop or pause operations, any triangular holes Dl5a and Dl5b can be accessed from the display window D2l.
Since we cannot see it, we can also know that the state C exists. In the above, a more effective display can be obtained by irradiating light from a lamp D22 or the like from the lower part of the display panel Dl3' as shown in FIG. 12f. Also, if the reel stands 20, 21 are used on the side opposite to the side connected to the tape counter, both reel stands 20, 21
This is advantageous because the back tension applied to the tape is approximately equalized, making it possible to more stably run the tape in both forward and reverse directions. Therefore, according to the tape running display mechanism as described above, an effective tape running display can be made with a simple mechanism so that various tape running states can be identified at a glance.

The above-described tape running display mechanism is convenient in its own way, as it is a simple mechanism that can display tape running effectively so that various tape running states can be identified at a glance. Since it has a unique display, it is difficult to say that it will not be subject to space restrictions when actually incorporated into a cabinet.

FIGS. 13A and 13B show an electronic tape running display device which has been improved in this respect and can easily and effectively display tape running in auto-reverse.

That is, FIG. 13a shows this electronically improved auto-reverse tape running display device, which can share not only the display of the tape running direction but also the level display of the recording/playback signal at that time. It has the following characteristics.

In the figure, the switch S1 is a power switch, but in the case of a tape recorder alone, it may be a leaf switch 701 or the like that is linked to the switch slider 702 described above. Further, the switch S2 corresponds to the head changeover switch 109 which is switched by the head moving mechanism 100 described above. When power is supplied to the movable contacts of switch S2 via switch S1, two anodes are connected for each contact on the side corresponding to forward or reverse running of the tape taken by switch S2. Light emitting diode LEDl,, LED,2 or LED,3, LEDl4
(Other display elements may be used; the same applies hereafter) selectively emits light to indicate the tape running direction.

And in this case, the valley light emitting diode LEDll~LE
The grounded emitter transistor Q3, whose cathode side of Dl4 is commonly connected to the collector, has its base bias from the playback output from the recording/playback head 15 mentioned above or from the microphone (including the tuner output in the case of a radio receiver tape recorder). Transistor Q that amplifies the recording signal of
Since the signals are supplied via an AC amplifier consisting of an AC amplifier consisting of an auto D1, a transmitting type detector consisting of an auto Dl and D2, and a DC amplifier consisting of a transistor Q2, the level of the recording/reproducing signal at that time (corresponding to the valley emission Diode LEDll,L
Since the driving currents of ED, 2 or LED, 3, and LED 14 are controlled, the display of the valley light emitting diode is accompanied by a level display function of recording and reproducing signals, etc. In addition, FIG. 13b is a further improvement of FIG.
12 and LED 14 are of a green light emitting type, and each of the PLAY operators 123 and 1 described above emit red or green light.
25 or the recording/playback switching switch S3 linked to the REC operator 124.
In other words, the device shown in FIG. 13b has the function of displaying the recording/playback status in addition to the tape running direction display and signal level display provided in FIG. 13a described above.
Fig. 14 shows an embodiment in which the electronic tape running display device as described above is applied to an auto-reverse type tape recorder with a radio receiver. The advantage of this structure is that it is not subject to space restrictions, and that it can display not only the tape running direction but also the level of recording/playback signals, etc., making it possible to display even more effectively. have.

FIG. 15 also shows another example of an electronically improved tape running display device, which is more effective than the previous example with respect to only the function of indicating the tape running direction.

That is, as shown in principle in FIG. 15a, the time division signal from the oscillation circuit 0SC is controlled on and off by the switch Sll which is linked to each of the PLAY operators 123, 125, the FF operator 126, and the REW operator 122 described above. The signal is passed through a shift register/drive circuit S/D to a plurality of (five in the illustrated case) light emitting diodes LED2l, LED22, L arranged in parallel at the center of the front surface of the cabinet, for example.
In addition to ED23, LED24, and LED25, these multiple light emitting diodes are connected from the left end or right end (LED2
l→LED22→LED23→LED24→LED25
) or (LED25→LED24→LED23→LE
D22→LED2l).

In this case, the shift register/drive circuit S/D
By controlling the output order in accordance with the tape running direction using switches S and 2, which correspond to the head changeover switch 109, the light emitting diode display runs in the direction that matches the tape running direction. It is something that makes you perceive that there is something going on. Moreover, the point deceleration of the light emitting diode at this time is determined by the above-mentioned switch Sl.
In other words, depending on whether the vehicle is traveling at a constant speed or at a high speed, the vehicle speeds up or slows down, making it possible to perceive such a state. In addition, the switch Sl3 in FIG. 15a is the above-mentioned P
A switch linked to the AUSE operator 127,
The display is not such that the light emitting diodes are run as described above, but the display is controlled so that at least one light emitting diode continues to be lit (or blinking).
Figure 15b shows a specific circuit of Figure 15a, where the oscillation circuit OSC is composed of a CR oscillator using an inverter, etc., and the shift register/drive circuit S/D operates the shift register section in serial mode and parallel mode. Integrated circuit 1C with mode P/S is used, and the drive part is transistor Q2.
, ~Q25.

Fig. 15c shows a specific example on the side different from Fig. 15b,
In this case, there are two light emitting diodes LED2l on the left and right sides,
The LED 25, LED 22, and LED 23 are arranged, and the switches Sll, Sl2, and Sl3 are arranged as described above.
By controlling this, the light emitting diodes on the side corresponding to the tape running direction are made to blink alternately, and the deceleration at that point is changed according to the tape running speed.

In this case, as shown in figure d, when driving on the left, LED2l, L
ED23 flashes and when driving to the right LED22, LED24
blinks, and in the pause state, LED23 or L
The one placed inside the ED 24 is in a lighting state, and the one placed outside the LED 2 or LED 22 is in a blinking state. 1st
Figure 5e shows a simplified form of figure c. In this case, when driving on the left, LED2l and LED23, and when driving on the right, LED22 and LED
D24 is in a blinking state. Such an auto-reverse tape running display device has a plurality of display elements that alternately flash in correspondence with the tape running direction so that it appears as if the tape is running, so it is extremely intuitive. In addition to being able to identify the direction in which the tape runs, it has the advantage of being electronically constructed, like the one shown in FIG. . By the way, although the head moving mechanism 100 shown in FIGS. 7a to 7h is quite advantageous compared to the conventional one, it is possible to make the head moving mechanism simpler and have an effect equal to or greater than that. Certain improvements are shown in Figures 16a-e. That is, in this case, the recording/reproducing head 15, which is provided so as to be vertically movable between the head slider 14 and the head mount plate 14b similar to that shown in FIG. It is fixed by spot welding or the like onto a head base plate 15a' which has a shape similar to that shown in FIG.
Here, two guide pins 102a, 1 are provided on one side of the recording/reproducing head 15 with respect to the head base plate 15a', one at the front and one at the rear.
At the same time, a lower azimuth adjustment screw 105 is inserted into the center of the other side of the recording/reproducing head 15 through a spring 106 so that it engages with the upper part of the head slider 14. They shall be screwed together so that they can be connected. Then, the two guide pins 10
2a and 102b are both tapered portions of a predetermined length D, which are made such that the diameter increases upward and downward from a small diameter portion in the central portion, and are engaged with the engaging portions 15a2 and 15a3 of the head base plate 15a'. In the illustrated case, the front side is fixed and the rear side is adjustable, and is installed between the head slider 14 and the head mount plate 14b. Further, on the head mount plate 14b, an upper azimuth adjustment screw 104 is attached to the spring 1 on the side corresponding to the lower adjustment azimuth adjustment screw 105 described above.
06 so as to be able to come into contact with the upper part of the head base plate 15a'. It is assumed that the configuration is the same as in the case of FIG. 7 described above, except that the head switching lever 14c' is made engageable with the rear lower notch engaging portion 15a1 of the head base plate 15a'.

According to the improved head moving mechanism 100' as described above, the position of the recording/reproducing head 15 is changed to that shown in FIG.
The ability to switch between the upper and lower positions as shown in C is the same as that in FIG. 7.

However, in this case, guide pins 102a and 10 are provided on one side of the recording/reproducing head 15 for height determination, that is, for determining the upper and lower positions.
By arranging two azimuth adjustment screws 104 and 105 in the center on the opposite side, the arrangement shown in FIG. While six parts were required, in FIG. 16 this can be done with four parts, which has the advantage of making it simpler. Furthermore, in the case of Fig. 16, by making the guide pin 102b on one side (rear) adjustable, the height (upper or lower position) can be adjusted without changing the stroke length (g) given by the taper part. )
This has the advantage that if one side of the upper or lower position is adjusted, the other side does not need to be adjusted, making it more convenient. In other words, in this type of head movement mechanism, it is important to position the head relative to the tape, and if this does not match, there will be a level difference between the two tracks and deterioration of crosstalk, but in reality, variations in component dimensions, etc. Therefore, it is desirable to have something that can absorb it.

However, the improved head moving mechanism 100 as described above
According to ', such variations in component dimensions can be easily absorbed by adjustment, and also because of the three-point adjustable type, rattling of various parts such as the fulcrum of the head switching lever 14c' can be ignored. On the other hand, there is an advantage that the accuracy of component dimensions can be reduced accordingly. In addition, the head slider 14 which has been brought into operation above returns to its original stop position when it is stopped manually or automatically, but this is due to the spring that applies the biasing force in the mouth direction to the slider 14 as shown in FIG. 140.

That is, in this case, the engagement between the valley regeneration levers 123a and 125a and the head slider 14 is due to the valley regeneration lever 123a.
, 125a are engaged only when the regeneration levers 123a, 125a are operated in the A direction, and are in a disengaged state when the regeneration levers 123a, 125a return, so a spring is required to return the head slider 14. Ta. However, such a return spring 14 acts as a load force when each regeneration lever 14 is operated in the A direction in order to bring the head slider 14 into operation, and therefore a large operating force is required. I need.

Next, FIG. 17 shows a case in which the head slider 14 is improved so that it can return without providing a return spring, thereby reducing the operating force as much as possible. Refer to and explain.

That is, FIG. 17a shows the configuration of the main parts (excluding the lock mechanism) on the lower surface of the main chassis 11, and 702A in the figure indicates the valley operating levers 122a to 12 described above.
The switch slider 1 is driven when the switch 6a is operated, and closes the power leaf switch 701 by means of its engagement piece 702 (in the above description, the engagement piece 702 was referred to as a switch slider 1).

In this case, the switch slider 702A has engagement pieces 102a and 70 for each reproduction lever 123a and 125a.
2b, REW, and FF levers 122a, 126a are engaged with engagement pieces RO2e, 7O2d, respectively, and return springs 702e,
702f constantly applies a biasing force in the direction of the arrow shown in the figure, and the guide holes 102g, 702h and the guide pin 1021
, 702j so as to be slidable in the direction of arrow A. What is not shown by the two-dot chain line in the figure is the head slider 14 that is provided on the upper surface side of the main chassis 11 and engages with each regeneration lever 123a, 125a, as described above, and in this case, the switch slider 7
It is characterized by having an engagement piece 14T that engages with the engagement piece 702 of 02A. Therefore, in the configuration of the switch slider 702A and the head slider 14 as described above, for example, as shown in FIG.
It is assumed that LAY is selected and the reproduction lever 125a in that direction is pushed in, and the switch slider TO2A and the head slider 14 are moved to the corresponding positions to perform forward reproduction.

In this case, the power leaf switch ROl is also driven by the engagement piece 702 of the switch slider 702A and is in the closed state as shown. If the above-mentioned manual or automatic stop is performed in such a state, first the regeneration lever 125a is unlocked and returns to the direction of the arrow, and in conjunction with this, the switch slider 10
2A is starting to return.

During this process, the engaging piece 702 of the switch slider 702A
Then, the engaging piece 14T of the head slider 14 is engaged and returned in the same direction. In this case, the switch slider TO2A is returned by the biasing force of the return springs 102e and 702f, but the leaf switch TO2A is
If the elasticity of l is sufficient, springs 702e and 702f
may be omitted. Note that the re-J re-lever 125a itself is returned by a return spring (not shown) as in the case of a normal tape recorder. Therefore, according to the switch slider 702A and the head slider 14 part as described above, the head slider 14 itself is not provided with a spring for return, so that the head slider 14 can return when stopped. This has the advantage that the operating force can be reduced as much as possible, and the number of parts and assembly man-hours can be reduced, contributing to cost reduction.

It should be noted that the above explanation is the same when the reproduction is in the reverse direction or when the auto-reverse state is set. Next, the improved reverse number limiting mechanism will be explained with reference to FIG. In other words, in the case of the mechanism shown in Fig. 5 mentioned above, when performing playback (recording) of only one forward and reverse reciprocation, right playback is initially performed, then left playback is performed, and in the process of stopping, the right playback ends. This is to prevent the right playback slider 125b from entering again later, so even if the shift is to left playback, the right playback operation lever 125a remains in the right PL.
Since the AY operation (button) 125 is still in a locked state, it is easy to give the wrong impression that the right playback state is resumed after the left playback ends, and the problem that it tends to become mechanically complicated has been corrected. It is something. In other words, the fifth
The reverse number limiting mechanism shown in the figure was one in which all the controls were returned to the stopped state only after one forward and reverse reciprocating operation was completed, whereas the mechanism shown in Fig. 18 was such that all the controls were returned to the stopped state each time, that is, the initial right-hand regeneration was completed each time. Then, the right playback control is unlocked, and when the left playback is completed, the left playback control is unlocked, so that the control returns to the stopped state every time one operation is completed. It is something. That is, the 18th
Figure a shows a locking mechanism on the lower surface of the main chassis 11. In the figure, 800 is a spring 800 which is formed into a substantially L-shaped side surface and is rotatable at the lower front end of the main chassis 11 and whose bottom part is always on the main chassis side. This is a lock plate that is supported by both end shafts 803 and 804 under biasing force.

This lock plate 800 is attached to the engaging portions 121T to 126 of the operating levers 121a to 126a shown in FIG. 17a.
T and locks the corresponding lever in the push-in position, or releases the lock if it is already locked (the engaging portion 126T in the STOP lever)
(equivalent to) claw-like locking parts 805 to 809 (however, 809
(used for both STOP and REW) are formed at predetermined intervals on the rear edge of the bottom. Further, as shown in FIG. 18b, this rotter plate 800 has approximately L-shaped release levers 810a and 810b whose valley ends are engaged with locking portions 806 and 808 for locking the left and right regeneration levers. , the lock plate 800
The other ends of the lock plate 800 are rotatably supported by protruding through rectangular holes 811 and 812 formed by cutting out the corresponding portions so as to face the vertical sides of the lock plate 800.

In this case, the release levers 809 and 810 are
3,814 (A biasing force is applied from this in the main chassis direction, and the locking portions 806, 8 of the lock plate 800
The tip of one end of the valley that interlocks with 08 is made into a pointed shape, and together with the locking parts 806 and 808, the corresponding lever 1
It can be freely engaged and disengaged from the engaging portions 123T and 125T of 23a and 125a. Further, it has an engaging portion 815 that can be freely engaged with and disengaged from the other end side of the one release lever 810b, and an engaging portion 816 that can be freely engaged and disengaged with the automatic stop select lever 509 described above in FIG. The limit lever 124 has one end supported so as to be rotatable in a direction perpendicular to the plane of the paper as well as the vertical direction in the figure, and the other end protrudes from the side surface of the main chassis and is rotatably supported on that part in this case.
drive lever 81r engaged with one end of c (see FIG. 5);
will be provided. Here, a spring 818 is attached to the protruding tip of the drive lever 81r, as shown in FIG. Also,
In the figure, 801 is a rod connected to the aforementioned operation lever 24 for limiting the number of reverse rotations, and 130 is also the aforementioned lock release portion, which is formed integrally with the lock plate.

(See Fig. 5) In the above configuration, in order to perform auto-reverse playback (recording) only once in forward and reverse directions, each operating lever 123a, 125a, etc. is operated, and the operating lever 24 for limiting the number of reverses is operated. As shown in FIGS. 18A and 18C, the rod 801 moves in the direction of the arrow A and the limit lever 124c, that is, the drive lever 8
17 is moved toward the lower surface of the main chassis 11 (arrow B) against the biasing force of the spring 818.

As a result, the engaging portions 815 and 81 of the drive lever 817
6 are release levers 8 each supported by a lock plate 800.
The other end of the automatic stop select lever 509 and the tip of the automatic stop select lever 509 are brought into an engageable state from the previously disengaged state. In this case, as described above, the automatic stop select lever 509 is set to the lock plate 800 at the end of the initial right playback.
The lock release portion 130 is in a disengaged position. In such a state, when the initial right playback operation is completed, the automatic stop action as described above is performed, but in this case, the lock plate 800 itself is not unlocked, but the automatic stop action is performed. The driving force is transmitted through the path of stop select lever 509 → engaging part 816 of drive lever 817 → engaging part 815 → release lever 810b, and finally the other end of release lever 810b is biased by the spring 814.・Rotate the lock plate 800 toward the vertical side against the As a result, only the right regeneration lever 125a, which is locked together with the locking portion 806 of the lock plate 800 at one end side of the release lever 810b, is released, and the right playback lever 125a is locked at one end side of the release lever 810b.
The AY operator 125 can be operated to return to the original stopped state. Further, the subsequent right playback operation and the lock release operation at the end of the operation are the same as in the case of FIG. 5 described above.

In other words, according to the reverse number limiting mechanism improved as described above, in performing one forward and reverse auto-reverse operation, the operator is returned to the stopped state every time one operation is completed. This has the advantage that it is possible to present an easy-to-understand state corresponding to the operating state of one reciprocating auto-reverse without giving erroneous recognition in an intermediate state as would be the case when all the operators are returned at once.

Further, in this case, it is possible to omit a complicated groove that would prevent the forward reproducing slider 125b from entering again, so there is an advantage that the overall configuration can be simplified accordingly. Note that the above explanation is based on one release lever 81.
Although only the 0b side is shown, the other release lever 810
A similar configuration can be applied to the a side to achieve similar effects.

However, in that case, it is assumed that reverse playback (recording) is given priority. The locking plate 800 described above was designed to rotate vertically with respect to the flat surface of the main chassis 11 to lock and release the valley operating lever; It may be a conventional locking plate that slides to lock and release the valley operating lever.

In other words, the release lever in this case may be provided so as to be movable in the horizontal direction with respect to the lock plate. By the way, the reverse number limiting mechanism shown in FIG. 18 is not necessarily limited to limiting the number of reverses;
For example, it is equipped with functions such as auto play and auto rewind, which have substantially the same purpose as auto reverse, and can be applied to the case where two or more operators are operated at one time.

In other words, the mechanism shown in Fig. 18 is most suitable for a tape recorder in which a plurality of operators are operated in combination to perform a compound operation, and as a mechanism that returns the operator to its original stopped state every time one operation is completed. This makes it possible to dramatically increase the usefulness of this type of tape recorder. Therefore, as described in detail above, according to the present invention, when both the forward and reverse playback controls are locked in the operating position to perform one forward and reverse auto-reverse, for example, the initial right playback is completed. When the playback is completed, the right playback control is unlocked, and when the left playback is completed, the left playback control is unlocked, so that the corresponding control returns to the stopped state every time one operation is completed. To provide an auto-reverse control device for a tape recorder, which has such a configuration that the operating state can be easily determined from the appearance and the auto-reverse operation can be easily and well controlled. becomes possible.

[Brief explanation of drawings]

Figure 1 is a perspective view of the main parts of an embodiment of an auto-reverse device applied to a force-setting type tape recorder;
The figure is an overall plan view with the main chassis removed from Figure 1, Figures 3 a-j are detailed views of the automatic stop mechanism shown in Figures 1 and 2, Figures 4 a-c, and Figures 5. A, b are detailed views of the auto-reverse 5-reverse drive unit shown in Figs. 1 and 2, and Figs. 6A and b are explanatory views of the operation of the constant speed feed system forward/reverse switching mechanism shown in Figs. 1 and 2. Figures 7a-h are detailed views of the head movement mechanism shown in Figures 1 and 2, Figures 8A and b are detailed views of the auto-reverse number limiting mechanism shown in Figures 1 and 2, and Figure 9. A, b are detailed views showing other head moving mechanisms in FIGS. 1 and 2;
Figures 0 a-e are detailed diagrams of the accidental erasure prevention mechanism shown in Figures 1 and 2, other layout diagrams of the 2PLAY operator REC operator, and Figure 1.
1A and 1B are detailed views of the high-speed feeding system forward/reverse switching mechanism shown in FIGS. 1 and 2, and FIG. 12 is a detailed view of the tape running display mechanism applied to FIGS. 1 and 2. Figures 13A and 13b are different circuit diagrams showing a similar improved electronic tape running display device, and Figure 14 is a detailed external perspective view of a power set tape recorder with a radio receiver to which the tape running display device of Figure 13 is applied. Figures 15a-e are detailed views showing another electronically improved tape running display device, and Figures 16a-c are 7th
Figure 17 showing the main parts of the head moving mechanism according to the improvement of the figure.
18A and 18B are detailed views showing the head slider return mechanism according to the improvement of FIG. 1, and FIGS. 18A to 18C are detailed views showing the reverse number limiting mechanism according to the improvement of FIG. 5. 11...Main chassis, 12...Operation section, 14...Head slider, 15...
... Recording/playback head, 151, 152... Erasing head, 16, 17... Pinch roller, 18, 1
9... Capstan, 20, 21...
Reel stand, 23... Motor, 24, 25...
...Operation lever, 300... Reel constant speed drive system, 400... Capstan drive system, 500.
...Automatic stop mechanism, 401,402...
Flywheel, 302... One center tap, 3
03... Right winding idler, 305...
Left take-up pulley, 306...Cam wheel, 23
1...One motor tap, 123b, 125b...
... Left and right playback slider, 600 ... Constant speed system forward/reverse switching mechanism, 601 ... Reverse drive lever, 604 ... Reverse gear mechanism, 603 ...
... Gear lock lever, 700 ... High speed forward/reverse switching mechanism, 501, 502 ... Left and right detection lever, 504 ... Cam lever, 505 ...
Slip stop gear mechanism, 507...Release slider, 509...Select lever, 605...
...Reverse lever, 124c...Limit lever 1, 124b...Limit slider 1, 70
1...Power leaf switch, 702...
・Switch slider 1, 130...Lock release unit, 100...Head moving mechanism, 101...
...Head switching slider 11a...Sub chassis, 15a...Head base plate, 14a...
... Head gripping member, 102-103 ... Reception pin, 104, 105 ... Azimuth adjustment screw, 14f ... Erasing head base plate, 122 ...
...REW operator, 123...PLAY(R)
Operator, 124...REC operator, 125...
...PLAY (own) operator, 126...F
F operator, Fll...switching lever, Fl4...
...High speed idler, Dl3...Display panel, D
l5...Friction plate, Dl5a, Dl5b...
...triangular hole, D2l...display window, S1...
...Power switch, S2... (head switching) switch, LEDl, ~ LEDl4... Light emitting diode (display element), Q, ~Q2... Transistor, Dl, D2 ...Diode, 0SC...
...Oscillation circuit, S/D...Shift register and drive circuit, LED2l to LED25...
Light emitting diode, Sll to Sl3... Switch, 15a'... Head base plate, 102a, 102
b... Guide pin, 14c'... Head switching lever, 100'... Head moving mechanism,
TO2A...Switch slider 1, 14T...
...Engagement piece, 800...Lock plate, 802
...Spring, 805-809...
Locking part, 810...Release lever, 81T...
... Drive lever, 818 ... Spring, 8
13,814...Spring.

Claims (1)

[Claims] 1. Has two playback operation members for forward running and reverse running that can be locked in respective operating positions, and enables auto-reverse operation that drives the tape at a constant speed in forward and reverse running states in conjunction with a tape end detection mechanism. In a tape recorder, one of the playback operation members for forward or reverse running is unlocked at the end of forward or reverse running of the tape, and at the same time, at the end of the reverse or forward running of the tape, the lock is released. An auto-reverse control device for a tape recorder, comprising a release mechanism for unlocking the other playback operation member for running or forward running.