JPS6240764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a full mechanical type auto-reverse device suitable for a portable tape recorder such as a cassette type, and particularly to a head moving mechanism thereof.

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, so it can be used for long periods of time. This is particularly useful when recording or playback is required.

However, since conventionally known auto-reverse devices use electromagnetic switching mechanisms such as solenoid plungers, they are large, heavy, expensive, and consume a lot of power. It had the following drawback.

Therefore, portable tape recorders such as cassette-type tape recorders, which are required to be smaller, lighter, and lower in price and require lower power consumption because they are powered by batteries, are equipped with electromagnetic switching mechanisms such as solenoid plungers. It was not possible to apply an auto-reverse device that uses

Therefore, this invention was made in view of the above points, and it is possible to perform auto-reverse purely mechanically without using a conventional electromagnetic switching mechanism such as a solenoid plunger. The purpose of this invention is to provide a so-called full mechanical type auto-reverse device suitable for portable tape recorders such as the E-type, and is particularly characterized by a reciprocating operation switching mechanism that allows the head to be moved easily and efficiently. It is equipped with the following.

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 is generally U-shaped in the front. It will be done. Protruding forward in the figure is the operation section 12, which includes, from the left end in the figure, a STOP operation button 121 for stop and eject, a REW operation button 122 for rewinding, and a control section 122 for reverse direction (reverse operation) playback. PLAY(R) operator 123, REC operator 124 for recording, PLAY for forward direction (forward motion) playback
(F) Operator 125, FF operator 12 for fast forwarding
6. PAUSE operator 12 for pause
These operators 121 to 127 are arranged in the order of 7 so that they can be pressed and operated in the direction of arrow A and can be returned to in the direction of arrow B, and each of these operators 121 to 127 controls each drive system to be described later through the respective operation levers 121a to 127a. It is designed so that it can be put into a driving state. In this case, each of the operation levers 121a to 127a is disposed at the bottom of the chassis 11 so as to be able to reciprocate in the directions of arrows A and B, and is engaged with a known locking mechanism (not shown) to lock the levers in the pressed state by pressing operation. be done as it is done. However, STOP operator 121
The lever 121a is not locked, but engages with the locking mechanism so as to release the levers of the other operators in the locked state. Also, PAUSE control 1
The lever 127a of 27 operates independently without any engagement with the lock mechanism, and engages with a known push mechanism (not shown) disposed at the bottom of the chassis 11 to operate the lever 127a for the first time. A pressing operation locks the device in the depressed state, for example, temporarily stopping the reproducing state, and a second pressing operation releases the locked state, for example, returning the device to the reproducing state.

and REW and FF operators 122, 126
Each of the levers 122a and 126a functions to selectively drive a forward/reverse switching mechanism of a high-speed feeding system, which will be described later, to cause the tape to run at high speed in the forward or reverse direction. In addition, each lever 123a, 125a of the PLAY (R) and PLAY (F) operators 123, 125
selectively drives a forward/reverse switching mechanism of a constant speed feeding system, which will be described later, to run the tape at a constant speed in the forward or reverse direction, and also drives a head slider 14 that can freely slide back and forth in the directions of arrows A and B. By bringing the recording/reproducing head 15 mounted on the head slider 14 into contact with a predetermined surface of the tape, and by selectively bringing the same pair of pinch rollers 16 and 17 into contact with a pair of capstans 18 and 19, which will be described later. , functions like a playback state in 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. The details of the operation will be described later.

By the way, with a normal tape recorder, it is only necessary to play back (record) in the forward direction, so of course one
The PLAY control may be used, but since it is necessary to playback (recording) in both forward and reverse directions in a tape recorder capable of auto-reversing as in this invention, two mutually independent controls for forward and reverse directions are required.
It is equipped with a PLAY operator. here,
When only one of the two PLAY controls is operated, playback (recording) is possible only in that direction, and when both are operated at the same time, so-called auto-reverse is possible, and normal playback (recording) is possible. ), you only need to operate the PLAY operator in the positive direction.

In addition, the REC operator 124 in the center of the illustration is
When operated in combination with the PLAY operator, the lever 12 can be used to record in only one direction, forward or reverse, or back and forth by auto-reverse.
4a drives the recording system. In addition,
In this case, a mechanism different from the usual one is used to prevent accidental 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 wah, and also to control the detection part of the automatic stop mechanism 500 to the reel constant. As the system is the same as the speed drive system 300, the detection section of the automatic stop mechanism 500 can be simplified. That is, the center pulley 3 is connected to the motor pulley 231 supported by the shaft of the motor 23 via the belt 301.
02 is connected to the center pulley 302, and a right winding idler 303 is pivotally supported to 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, right take-up idler 3
03 is the PLAY when feeding to the right as described later.
(F) It can be freely moved toward and away from the right reel stand 21 at the same time as the center pulley 302 via a link mechanism 26 driven by a right playback slider 125b connected to a lever 125a of the operator 125. However, this right winding idler 303 is omitted and the center pulley 3 is moved by the link mechanism 26.
02 itself may be moved toward and away from the right reel stand 21, and furthermore, these may be configured to be interchanged on the left and right sides.

In addition, a belt 304 is connected to the small diameter portion of the center pulley 302 and forms a substantially triangular loop with that portion as one bottom corner, and the left take-up pulley 305 and the top A cam wheel 306 is provided at the corner. Here, the left take-up pulley 305 is connected to the lever 12 of the PLAY(R) operator 123 during left feeding as will be described later.
It can be moved toward and away from the left reel stand 20 via an operating member 27 driven by a left playback slider 123b connected to the left reel stand 3a. Further, the cam wheel 306 constitutes a detection section of the automatic stop mechanism 500, and in this case, the left and right reel stands 20,
21 is in a stopped state, the details of which will be described later.

Furthermore, in Fig. 2, the capstan drive system 4
00 is the belt 405 via the motor pulley 231
It has a pair of left and right flywheels 401, 402 and a guide pulley 403 thereof, which are of a so-called anti-rolling type. Here, a pair of left and right capstans 18, 19 are provided at the center of the left and right flywheels 401, 402, respectively.
is provided. The details of the forward/reverse switching mechanism 600 of the constant speed feed system and the forward/reverse switching mechanism 700 of the high speed feed system shown in FIG. 2 will be described later.

According to the constant speed drive mechanism as described above,
In addition to the above-mentioned improvement in the wow characteristic, the reel base can be driven on the biting side for both left and right feeds, resulting in stable rotation transmission, and since the motor does not need to be reversed, it is possible to achieve advantages in terms of price and lifespan. effective.

As can be seen from the above configuration, it is possible to perform left-right feed and auto-reverse, but it is of course possible to perform normal tape recorder operations. Of these, the explanation of the latter will be limited to only the particularly necessary matters, but this can be easily seen from the explanation of the former. Therefore, we will mainly explain the auto-reverse relationship, but first we will start with an explanation of the automatic stop mechanism 500. In other words, as is well known, the auto-reverse operation detects the end of the tape when the tape is in the forward or reverse playback (recording) state and automatically switches to the reverse or forward playback (recording) state. This is because it is convenient to first explain the tape end detection provided by the detection section of the automatic stop mechanism 500.

Now, if the tape is in the right-feeding or left-feeding state (this assumes that the tape is set to any other operating state except for the auto-reverse setting described later), the automatic stop will occur. The state of the mechanism 500 is as shown in FIGS. 3a and 3b. That is, as shown in FIG. 3e, the left and right reel stands 20, 21 are both equipped with friction mechanisms 201, 211 at the bottom, and the friction plates 2
02, 212, the left and right detection levers 50 are approximately T-shaped and connected with each end of the bottom side with play.
1,502 are engaged with each other and are rotatable. Of these, a trace pin 503 is implanted in the right detection lever 502 and guided by the inner eccentric cam portion 306a of the cam wheel 306.
As a result, when the tape is being fed rightward (FIG. 3a), as the right reel stand 21 rotates counterclockwise as shown by the arrow, it engages with its friction plate 212. A biasing force is constantly applied to the right detection lever 502 to rotate it clockwise. As a result, the right detection lever 502 is activated by the cam wheel 30 while the tape is in the right feeding state.
The trestle pin 503 guided by the inner eccentric cam portion 306a of No. 6 swings clockwise and counterclockwise within a small range. In such a state, if the end of the tape arrives and the right reel stand 21 stops, the right detection lever 502
Since the clockwise biasing force against
As shown in Figure c, the detection lever 502 stops at the position where it is pushed counterclockwise. Then, in the next rotation of the cam wheel 306, which rotates independently of tape running, the cam wheel 306 is engaged with its outer protrusion 306b.

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, since the aforementioned cam wheel 306 is pivotally supported by one end of the cam lever 504, the cam wheel 306 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, is connected to the center pulley 302.
It is meshed with a gear 302a provided in the small diameter portion of. Here, the gear 302a is directly connected to the motor 23 and serves as a driving source for so-called automatic shut-off (ASO) operation, and its meshing relationship with the gear mechanism 505 and its operating state are shown in FIGS. It seems to show.

That is, the gear mechanism 505 that is engaged with the cam lever 504 consists of gears A, B, and C that are in mesh 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. As a result, the pin 506 provided on the fan-shaped gear C is finally rotated clockwise, causing the release slider 507 to move downward in the figure as shown in FIG. Release the locked controls to stop the tape recorder.

In this way, the automatic stopping operation can be achieved, but in the above process, the cam lever 504 is rotated clockwise and then stopped at the position where the pin 506 at the other end comes into contact with the release slider 507. The wheel 306 is held in that position (FIG. 3c) by the slippage 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 engagement with the tres pin 503, so the tres 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 (the third
Figure b) As the left reel stand 20 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. Therefore, one end of the bottom side of the right detection lever 502, which was loosely connected during the right-hand feeding operation described above, is brought into a connected state, and the right detection lever 502 is eventually rotated clockwise at all times in the same manner as described above. give such a bias. 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 such an automatic stop mechanism 500, the (right) detection lever 502 and cam wheel 306
Since the disengagement is automatically performed by the rotational force of the cam wheel 306, it is possible to eliminate the need for the above-mentioned disengagement member that was conventionally required for this type of automatic stop mechanism. This provides a degree of freedom in the arrangement of the drive source for the turn-off operation, the detection lever, etc., and furthermore, the detection lever can be fixed to the shaft, which is preferable in terms of accuracy and makes the operation more stable.

In addition, since the cam wheel 306 constituting the detection section is rotated together with the reel constant speed drive system 300 by one belt, it is possible to rotate the cam wheel 306 on either the left or right reel stand 2
Since stops of 0 and 21 can be detected in common, this is advantageous in terms of simplification of configuration 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 this also means that the auto-shut-off action can be performed even if the tape becomes tangled to protect the tape and each mechanical part. can.

Next, I will explain the auto-reverse relationship.
FIG. 4a shows the auto-reverse drive system taken out from FIGS. 1 and 2, and includes the aforementioned lever 123 for reverse and forward regeneration
a, 125a each have a pinch roller 1.
6, 17, the left and right regeneration sliders 123b, 125b that control the right winding idler 303 and the head slider 14 are connected to springs 123c, 1
25c. Here, lever 12
3a and 125a are moved in the directions of arrows A and B by guide pins 123e and 125e that are engaged with the guide portion at the front end of the main chassis 11 shown in FIG. 1 and the elongated holes 123d and 125d shown in FIG. Freely sliding back and forth (same for other levers not shown)
It is said that The head slider 14 and the left and right playback sliders 123b, 125b also have long holes 14a, b, 123f, 125f, respectively.
The guide pins 14c, d, 123g, and 125g are engaged with the guide pins 14c, d, 123g, and 125g, thereby making it possible to freely slide back and forth in the directions of arrows A and B.

And the springs 123c and 125 mentioned above
By the engagement by c, the head slider 14 can be driven even when the playback levers 125a, 123a in the forward or reverse direction are operated, and the left or right playback sliders 125b, 12 on the corresponding side can be driven.
3b can be put into a driving state.

Furthermore, in this case, the locking mechanism of the operation section 12 used in this type of tape recorder is such that when one operation lever 123a or 125a is locked, the other operation lever 123a or 125a can be operated at the same time, or almost at the same time even if there is a slight time lag. Lever 125a or 123
It is assumed that both a and a can be locked without releasing the lock of the former, and furthermore, it is also possible to lock the recording operation lever 124 together with these locks.

Therefore, assuming that auto-reverse (regeneration) is not performed now, the forward and reverse operation levers 123a, 12
5a is both PLAY (R), (F) operators 123, 12
If it is locked by the pressing operation in step 5, both the left and right playback sliders 123b and 125b will move into the driving state as shown in FIGS. 4a and 4b. One of them is stopped mid-way by a substantially T-shaped reverse drive lever 601 that is rotatably provided in the reverse drive lever 601, and one of them is in a standby state, and one of them is allowed to enter and the regeneration state in that direction. It is done.

Here, it is assumed that the reproduction state is performed in the rightward direction, that is, in the forward direction, as shown in FIG. In addition, the forward/reverse switching mechanism 600 of the constant speed feed system is set so that when operated simultaneously, the forward direction is given priority for reasons described later.) Then,
In this state, the spring 602 (see Fig. 4a)
In this case, the gear lock lever 603, which is biased so as to rotate clockwise at all times, is rotated in the direction of the bias from the stopped state shown in FIG. 4a by the entry of the right regeneration slider 125b. One end 603a of the reverse gear mechanism 604 is engaged with a cam portion 604a of a reverse gear mechanism 604, which will be described later.
The reverse drive lever 601, which cooperates with the reverse drive lever 601 as will be described later, is held at the upper right position in the figure (this will be referred to as the first position), and the left playback slider 12 is held on the left side of the reverse drive lever 601.
3b's entry is blocked. Also, the concave portion 12 of the right playback slider 125b that is allowed to enter at this time.
As the one end of the link mechanism 26 described above falls in step 5b _-1 , the right take-up idler 303 is changed from the previously separated state to the contact state between the small diameter portion of the center pulley 302 and the right reel stand 21. It performs a rightward feed run, that is, playback in the forward direction. (This also applies when the forward direction operation lever 125a shown in FIG. 5a is operated in one reciprocating auto-reverse operation, which will be described later.) When the end of the tape arrives in such a forward direction playback state, the above-mentioned In this manner, the detection section of the automatic stop mechanism 500 operates, but in this state, the gear lock lever 603 is in the fourth position.
As it rotates clockwise from the stop position shown in FIG.
8 (see FIG. 4a), the approximately L-shaped automatic stop select lever 509, which is normally biased to rotate counterclockwise, is rotated clockwise. is placed in a position opposite to one end of the reverse lever 605 which is rotatably supported in a substantially L-shape from a position opposite to the lock plate release part 130 in the normal case, so that the auto-shut-off function as described above is Instead of performing the operation, the reverse lever 605 is now rotated clockwise. As a result, the other end of the reverse lever 605 is connected to the one end 6 of the gear lock lever 603.
03c and rotates it counterclockwise, one end 603 of the gear lock lever 603
Cam part 604 of reverse gear mechanism 604 by a
a, and the reverse drive lever 601 cooperates with the gear mechanism 604 as described below.
and move it to the upper left position (this will be referred to as the second position) as shown in FIG. 4c.

Here, to explain the cooperative relationship between the reverse drive lever 601 and the reverse gear mechanism 604, the reverse gear mechanism 604 includes a pin 604b that engages with a long hole 601a formed at the right end of the reverse drive lever 601, and a cam portion as described above. Reverse gear A604c having 604a and this gear A60
The reverse gear B604e is coaxially integrated with the small gear meshing with the small gear 4c and has a notch 604d in a part. (including when in the state), the reverse gear B60
The notch 604d of 4e is located at a position facing the center pulley gear 302a, and both gears 604d
04e and 302a are in a state where they do not mesh. In this state, when the end of the tape is reached and the gear lock lever 603 is disengaged from the gear mechanism 604, the reverse gear A604c is slightly rotated counterclockwise due to the reaction. As a result, gear B604e also rotates slightly in the same direction, so gear B604e and gear 3
02a will 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. This is to move the reverse drive lever 601 from the state shown in FIG. 6b to the state shown in FIG. 6a. That is, the reverse drive lever 601 is moved from the first position upward to the right to the second position upward to the left, but by setting the gear ratio of the gear mechanism 604 appropriately, the reverse drive lever 6
01 moves to the second position, the notch 604d of the reverse gear B604e again faces the center pulley gear 302a, and both gears 60
4e and 302a return to their original state in which they do not mesh.

In this way, when the reverse drive lever 601 reaches the second upward left position, the left playback slider 123b, which had been blocked by the left end of the reverse drive lever 601, is allowed to enter, as shown in FIG. 4c. This results in a leftward feed run, that is, a reverse playback state. 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, has its locking portion 125b _-2 aligned with the reverse drive lever. It is pressed against the left end of 601 and returned downward in the figure, and is in a standby state. Also, the left playback slider 123b that was allowed to enter at this time
The operating member 27, which had fallen into the tip key-shaped portion 123b _-1 , is released and rotated in the direction of the clockwise biasing force by the spring 27a, so that the left take-up pulley 305, which had been in the released state, moves to the left. It is brought into contact with the reel stand 20 and performs the left feed run as described above, that is, playback in the reverse direction.

When the end of the tape arrives in such a reverse playback state, the automatic stop mechanism 50 starts again.
Since the detection section 0 is activated, the regeneration state can now be changed from the reverse direction to the forward direction (Fig. 4b), just as the regeneration state was switched from the forward direction to the reverse direction as described above. Unless the STOP operator 121 is operated to stop the tape recorder, the forward <-> reverse playback state will be repeated any number of times.

In the above-mentioned so-called full mechanical type, auto-reverse can be achieved by using the reverse drive lever 6, which linearly switches from normal to reverse playback state.
01 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. is selectively transmitted through the center pulley gear 302a to operate the reverse drive lever 601 to drive one of the regeneration sliders 123b or 125b and to set the other regeneration slider 125b or 123b to a 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 portable tape recorders such as cassette type. It turns out that it is suitable. Furthermore, since such an auto-reverse device is a two-play button system, it has the advantage of being able to perform normal one-way playback in any direction.

Next, we will explain the right feed priority mechanism that gives priority to right feed travel when both PLAY (R) and (F) operators are operated at the same time.
This is achieved by setting the position of 01 to always be the same. That is, this includes a constant speed forward/reverse switching mechanism 600 including a gear mechanism 604 that cooperates with the reverse drive lever 601 shown in FIGS. switch slider 702
This is done through a relationship of engagement and disengagement with. Here, the switch slider 702 is connected to the STOP operator 121 and
The power leaf switch 701 is driven in conjunction with all other controls except the PAUSE control 127.
It is in charge of supplying power to the motor 23 by keeping it in a closed state. And, as mentioned above, auto-reverse is set by the left and right playback sliders 123.
b, 125b, by allowing the entry of one and blocking the entry of the other, but both
When the PLAY (R) and (F) operators 123 and 125 are operated at the same time, the left and right playback sliders 12
3b, 125b engages with the reverse drive lever 601, the gear lock lever 603
Since the timing at which the one end 603a engages with the cam portion 604a of the reverse gear mechanism 604 is earlier, when the reverse drive lever 601 is in the first position upward to the right as shown in FIG. 6b, the power leaf switch 701 and There is no engagement, and the right feed running state as described above is maintained. 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 701, 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 used when the tape is loaded in the right direction, that is, in the forward direction, and when an auto-reverse operation is to be performed, both PLAY (R) and
(F) Since the operators 123 and 125 are normally operated at the same time, rational operation is possible regardless of this assumption. Moreover, such a right feed priority mechanism does not require the addition of any special parts and does not utilize the inertia of the flywheel, etc., so there is no need to increase the size of the flywheel, making it easy and reliable. It has the characteristic of being able to perform priority actions.

In addition, in the above explanation of the auto-reverse relationship, only playback was explained, but the REC operator 124 is connected to both PLAY (R) and (F) operators 123 and 1.
Of course, if you operate it together with the 25, 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 it can be repeated many times. In other words, when performing auto-reverse recording, it is convenient to limit the recording to one recording in the forward and reverse directions, that is, one round trip recording.

Furthermore, when performing auto-reverse, 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, the reverse number limiting mechanism provided for this purpose will be explained. By rotating the operating lever 24 shown in FIG. Then, the rotatable limit lever 124c is rotated in the same direction. Then, as shown in FIG. 5a, the limit slider 124b is released from the previous positional restriction by the limit lever 124c and is biased to the left in the figure by the spring 124d. The reverse lever 60 is inserted into the notch 124b _-1 .
5 is engaged, 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 at the end of the tape, the automatic stop mechanism 500 is activated and the reverse lever 605 is activated.
When the is rotated clockwise, the right playback slider 125b is finally retreated to the standby state as described above, and the left playback slider 123b is advanced to perform the left feed movement shown in FIG. 5b, that is, the reverse. The direction can be switched to playback or recording mode. Here, in the retraction process of the right reproduction slider 125b, a biasing force is applied to the recess 125b _-3 in the left direction, so that the proximal pin portion 124 of the limit slider 124b is slidable in the left-right direction in the figure.
The fall of b _-2 prevents 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 of the gear lock lever 603 is rotated in the counterclockwise direction shown in the figure, and the automatic stop select lever 509 is activated to release the lock release part 1.
30, the automatic stop mechanism 500 is rotated to a position opposite to the automatic stop mechanism 500 when the end of the tape is reached in the reverse playback or recording state.
Since the automatic shut-off operation is performed by
It is possible to perform playback or recording only once in forward and reverse directions.

This makes it possible to prevent double or more erroneous recordings (erroneous erasures), especially in the case of recording, and also makes it possible to limit the number of reverses during playback, if necessary. Moreover, since such a reverse number limiting mechanism only requires adding a simple mechanism to the above-mentioned full mechanical type auto-reversing device, it is suitable as an accessory device for the auto-reversing device. 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 during recording, permanent auto-reverse is possible as long as the lever 24 is not operated, so if you want to record only the most final information, this is fine, but you can set the number limit or limit depending on various uses. It is convenient because you can use the automatic reverse permanently. 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 same form is ultimately followed, such as right → left → stop or left → right → left → stop (when the reverse direction PLAY (R) operator 123 is operated with priority). It is easy to determine what state it is functionally in because it stops when it stops.

However, when the REC operator 124 is pressed to both PLAY
(R), (F) When operated together with the operators 123 and 125, in other words, when performing auto-reverse recording, one round trip recording is automatically performed without having to operate the operation lever 24 of the reverse number limit mechanism from the outside as described above. It can be said that it is more convenient to prevent erroneous recording, that is, erroneous erasure, by limiting the number of reverses, as shown in FIG. Therefore, next time, for auto-reverse recording, the REC operator 124 and both
A mechanism that automatically performs one round trip recording when the PLAY (R) and (F) operators 123 and 125 are operated together (provided that right feed is given priority) will be explained. That is, in this case, as shown in FIG. 8a, the reverse lever 605 that operates when the end of the tape is detected, the right playback slider 125b that enters when feeding right and retreats when feeding left, and the operating lever 124a of the REC operator 124, respectively. A limit slider 124b' is provided as a stopper so as to be slidable in the left and right directions in the figure, and a biasing force is applied in the right direction in the figure by a spring 124d'. In this case, the stopper function for the former two is the same as in the case of the limit slider 124b shown in FIG. This is done by dropping the tip pin 124B of the limit slider 124b'. 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. is released and slid to the left in the drawing, and the tip pin 124d is dropped into the recess 124c of the operating lever 124a of the REC operating element 124. This maintains the clockwise rotation of the limit lever 605 as described above, and then performs an auto-shut-off operation at the end of the tape when feeding to the left, as shown in Figure 8b. This allows recording to 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.
The engagement with the cam portion 604a of the reverse gear mechanism 604 may be released by rotating the gear lock lever 603 in the counterclockwise direction shown in the figure through the operation in step 5. With this, the tape running direction can 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 of the reverse drive lever 601 with the concave portion 101a at the tip, the reverse drive lever 601 can freely slide in the left-right direction to assume a rightward position or a leftward position corresponding to the first and second positions taken by the reverse drive lever 601. A head switching slider 101 is provided.
Here, in the head switching slider 101, a guide pin 11b and a click ball 11c provided on the sub-chassis 11a are respectively engaged with a long hole 101b and a square positioning hole 101c or 101d. It has no direct relationship with the slider 14. However, one end of the head switching lever 14c is attached to the head slider 14 via an appropriate number of supports 14a and is rotatably supported by a head mount plate 14b having heads 151 and 152, which will be described later, at both ends. is a head gripping member having a generally U-shaped side surface that is loosely engaged with the head switching lever 14c by being engaged between two wire-like engaging members 101e supported at the tip of the head switching slider 101. 14d to convert 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 FIG.
As shown in d, 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 adjusting screw 1 are attached to the head base plate 15a.
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 of the upper and lower receiving pins 102 and 103 has a tapered tip and a stepped portion, and the head base plate 15a is engaged with its engagement hole 15b or 15c to ensure correct vertical movement. It guides the user as desired and also positions it up and down. In addition, the upper and lower azimuth adjustment screws 104, 1
05 is the head base plate 15 with vertical positioning
In other words, the azimuth of the recording/reproducing head 15 is adjusted independently in advance via springs 106 and 107 so that the upper and lower azimuths of the recording/reproducing head 15 are respectively optimal. And Fig. 7c,
d, the reverse drive lever 601 is the second,
In the first position, the recording/reproducing head 15 is moved up and down to feed the tape to the left and to the right. Further, FIGS. 7e and 7f show the right-hand feed when viewed from the side, that is, the state in the middle when the recording/playback head 15 is moved downward, and the state at the stop position, and the 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.

Note that a switching spring 108 supported on the head switching slider 101 is attached to the sub-chassis 11a.
In conjunction with the vertical movement of the head 15, a head changeover switch is operated to switch the head corresponding to the (L) and (R) channels of the stereo tape when the head is a stereo head, and also to switch the erasing heads 151 and 152. 109 is provided, but the former is not necessary when used only with a monophonic tape.

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 it can be adjusted, it is possible to achieve the optimum azimuth for both, compared to conventional fixed heads that can only accommodate one side, and the recording/playback head itself can be a normal one, which is particularly expensive. . Furthermore, in the past, there have been models of this type in which azimuth adjustment was performed using a solenoid plunger, but in this case it was not possible to solve the problem of rattling on both sides of the head.
According to the above configuration, the head base plate 15 is fixed by two taper pins and one azimuth adjustment screw.
Since it is supported at three points on both the top and bottom, 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, eliminating wobbling on both the left and right sides. can do. That is, although the above-mentioned conventional device is a three-point adjustment type, since the three points are simply brought into contact with a coplanar surface, there remains some lateral tilting and backlash.

By the way, the head moving mechanism 100 as described above
, a pair of left and right erasing heads 151, 152
Although it is a fixed type (in this case, each head surface is associated with the top or bottom position), in reality, the amount of thrust of the erasing head into the tape surface is adjusted to increase the erasing rate during auto-reverse (recording). It is desirable to satisfy the conflicting demands that the amount of thrust of the erasing head must be reduced in order to improve the wah characteristic, but on the other hand, it is necessary to increase the amount of thrust of the erasing head. Therefore, a mechanism for controlling the amount of thrust of the erasing head that satisfies these requirements will be explained below.As shown by the two-dot chain line in FIGS. 9a and 9b, there is An approximately 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, 1 are provided at both ends of the upper side of the erase head base plate 14f.
52 and the spring 14g that is engaged with the pin 14e is attached to the reverse drive lever 601.
engage the bottom edge of the As a result, the erasing head base plate 14f is connected to the reverse drive lever 60 independently of the head slider 14 and the head mount plate 14b.
Clockwise (FIG. 9a) or counterclockwise (FIG. 9b) depending on the first and second positions taken by
Since the erase head 15 is rotated as shown in FIG.
The amount of thrust into the tape T of 1,152 is made smaller on the downstream side than on the upstream side with respect to the recording/reproducing head 15. In other words, for example, when feeding to the right, the amount of thrust 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 at the same time, the amount of thrust 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. 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 spring 1 for regulating the amount of rotation of the erasing head base plate 14f.
4g, and 14i is an engagement member that 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. and,
In this case, by increasing the amount of rotation of the erasing head base plate 14f so that the erasing head on the unused side is greatly retracted, it is also possible to use a magnetic erasing head, which can be made cheaper than an AC erasing head.

Next, to explain the accidental erasure prevention mechanism, the first
FIG. 0a shows the erasure prevention mechanism taken out from FIG. 1, and the operating lever 124a of the REC operator 124 has locking portions 124n and 124o formed at its rear end portion to project left and right. A substantially crank-shaped left claw or right claw detection lever 124 has one end engaged with each of these locking portions 124n and 124o, and is biased counterclockwise or clockwise by springs 124p and 124q.
f, 124g are rotatably provided. Furthermore, these detection levers 124f and 124g are connected to left and right recording prevention levers 124 which are rotatably supported alternately via wire rods 124h and 124i.
j, 124k. Furthermore, a locking member 124 is rotatable left and right to sandwich the other ends of these recording prevention levers 124j and 124k.
l, 124m is provided. Here, locking member 1
24l and 124m correspond to locking portions 123b- ₅ and 125b- ₅ formed at corresponding portions of the left and right reproduction slider erasers 123b and 125b. In the figure,
W ₁ and W ₂ are a pair of left and right detection windows formed at the rear of the case of the cassette tape CT. 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 portion 124 of the lever 124a
The left and right pawl detection levers 124f and 124g, whose positions were restricted by engagement with the levers 124f and 124o, are now free to rotate in their respective biasing force directions. One end of each of these detection levers 124f and 124g attempts to enter the detection windows W ₁ and W ₂ of the cassette tape CT, but the detection windows W ₁ and W ₂ are blocked by the so-called erasure prevention claws. If the claw is present, entry is blocked; on the other hand, if the claw is cut off, entry is allowed, and the amount of rotation becomes large. Then, the large amount of rotation is transmitted to the left or right prevention lever 124j, via the rod 124h or 124i.
127k is rotated, the locking portion 123b _-5 or 125b _-5 , which is engaged in a pinching manner at the other end thereof, is moved from the position shown by the solid line to the position shown by the broken line. As a result, one or both of the left and right playback sliders 123b and 125b are prevented from entering (equivalent to no claws), or
Entry is permitted (corresponding to the presence of a claw), and in either case, it is possible to prevent recording on the side without the erroneous erasure prevention claw, that is, erroneous erasure.

In other words, this is how to prevent accidental erasure, but unlike normal ones, the REC controller can be operated at any time regardless of the presence or absence of the accidental erasure prevention claw, and the PLAY controller on the side without the claw becomes inoperable. As a result, even if the cassette tape has one of its claws bent, it is possible to record by reversing the loading of the cassette tape without reversing the loading process. In this case, the REC controller 124 should be sandwiched in the center, and the left and right controls should be placed on both sides.
Since the PLAY (R) and (F) operators 123 and 125 are arranged, the correspondence relationship with the cassette tape is easy to understand and operations are easy to perform. This is advantageous in terms of manufacturing (especially molds, etc.).

The above-mentioned accidental erasure prevention mechanism is preferable because the detection lever is retracted when the tape recorder is stopped, making it easy to attach and detach the cassette tape. The same can be said when one half of the mechanism is applied to prevent normal accidental erasing. Also, in this case, a degree of freedom in design is ensured, and is particularly suitable for a square tape recorder.

Next, to explain the forward/reverse switching mechanism 700 of the high-speed feed system, FIG. 11a shows the forward/reverse switch mechanism section of the high-speed feed system taken out from FIGS. 122 and FF
Each operation lever 122a, 126a of the operator 126
A substantially inverted T-shaped switching lever F11, which has both ends corresponding to the engaging portions 122b and 126b protruding inwardly and is rotatably supported approximately in the center thereof, has a spring mechanism F12 at its upper end. The idler support lever F13 is engaged with one end of the idler support lever F13 through the idler support lever F13. At the other end of this idler support lever F13, the pair of left and right flywheels 401, 402 and the reel stand 20,
A high-speed idler F14 is provided approximately in the middle of 21 and can be selectively moved into and out of contact with these. For example, if the lever 126a of the FF operator 126 is now pushed in as shown by the arrow as shown in FIG.
The switching lever F1 is engaged with a corresponding end of the switching lever F1.
Rotate 1 counterclockwise. Then, since the idler support lever F13 is rotated clockwise via the spring mechanism F12, the high-speed idler F14
are the right flywheel 402 and the right reel stand 21
is in contact with both of them, and high-speed feed in the right direction, that is, a fast-forward state is realized. And in this case,
When the FF operator 126 is operated while the PLAY (F) operator 125 in the right direction has been operated in advance to perform playback in that direction, the other end of the switching lever F11 engages with the high speed slider F15. In order to push it back in the direction of the arrow shown in the figure, the tip engaging part F16 of the high speed slider F15 moves the engaging part 14k of the head slider 14, which has been pushed from the position shown by the broken line (when stopped) to the position shown by the solid line in the figure. This allows a so-called cue operation to be performed by slightly pushing back toward the front. Furthermore, when the operating lever 122a of the REW operator 122 is operated alone or in combination with the leftward PLAY(R) operator 123, the operation is opposite to that described above and the rewind state or review state is established. It's something you get.

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 performing queue operation and review operation with this type of device, two dedicated switching levers are used for each.
As mentioned above, a single switching lever can be used. Furthermore, since a single switching lever is used, erroneous operations such as operating the FF and REW operators at the same time are prevented, thereby protecting the tape and each mechanism.

Next, to explain the characteristics of the operating mechanism that enables the auto-reverse function as described above, as explained in Fig. ，
(F) 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.

In addition, the REC control and left and right PLAY (R), (F)
Regarding the arrangement of the controls, as shown in Figures 10 b to e, the width of the REC controls may be narrowed, the shape may be T (⊥) shaped, and the left and right PLAY(R),
(F) If you straddle the controls, you can operate these three controls or two adjacent controls in a so-called one-touch method by pressing the circular parts indicated by the broken lines in the figure for each purpose. Recording or playback by auto-reverse or desired unidirectional recording or playback can be performed more easily.

Next, a description will be given of a tape running display mechanism particularly suitable for a tape recorder equipped with an auto-reverse device as described above.As shown in FIG. Concatenate. This pulley D1
2 is integrally formed with a display panel D13 having a striped portion D13a on the upper part, and an axis D14 is formed at the center of the display panel D13.
The shaft D1 is supported by the display panel D13 and protrudes from the display panel D13.
4 is engaged with the friction plate D15. Here, the friction plate D15 has a substantially pot-shaped shape, and has two triangular through holes D15a and D15b with inclined portions facing each other near the periphery of the large circular portion, and has two triangular through holes D15a and D15b with inclined portions facing each other, and near the periphery of the small circular portion. A long hole D15c is formed in the vicinity of the large circular portion, and the shaft D14 is supported at the center of the large circular portion.
stopper D17, so that braking force is applied by D6.
The retaining ring D18 is applied, and in this state, the stopper D19 is engaged with the elongated hole D15c of the small circular portion. Then, the triangular hole D of the friction plate D15
A display window D21 is formed in the upper tape recorder housing D20 corresponding to approximately the middle part of the tape recorder housings D15a and D15b. Therefore, in the above configuration, if the left or right reel stand 20, 21 is rotating in either direction, the rotational force is transmitted.
The display panel D13 rotates. Along with this, the friction plate D15 also tries to rotate, but since the stopper D19 is engaged with the elongated hole D15c in the small circular part, it is restricted at the position where the stopper D19 comes into contact with the end of the elongated hole. slip. It is assumed that this slip position is set so that either of the two triangular holes D15a or D15b in the large circular portion of the friction plate D15 is in a positional relationship opposite to the display window D21 of the tape recorder housing D20. Then, from the display window D21, the rotating state of the striped portion D13a of the display board can be seen through either the triangular holes D15a, D15b of the friction plate D15 on the reel stand 20 or 2.
12 b to e depending on the rotation direction (tape feeding direction) and its rotation speed (constant speed or high speed).
It is observed as shown in . That is, b and c are in the right feed playback and left feed playback states, and the striped portion D is relatively
13a is wide, that is, the movement of the striped portion D13a appears slow, and d and e are in fast forward (FF) and rewind (REW) states, and the spacing between the striped portions D13a is narrow, that is, the movement of the striped portion D13a appears fast. In this case, since the direction of the top of the triangular hole D15a or D15b of the friction plate D15 visible from the display window D21 represents the tape feeding direction, the striped portion D
In addition to the state of 13a, it is possible to easily identify the feeding direction and whether it is constant speed or high speed, and thus also know what state it is in. Furthermore, the reel stand 20
Alternatively, the rotational speed of the tape 21 changes depending on the amount of tape wound, and since the movement of the striped portion D13a follows this, it can also be used as a guide for knowing the amount of tape (remaining). Of course, neither of the triangular holes D15a and D15b can be seen from the display window D21 during stop or pause operations, so
You can also know that you are in that state.

Incidentally, in the above, if light from a lamp D22 or the like is irradiated from the lower part of the display panel D13 as shown in FIG. 12f, an even more effective display can be obtained. In addition, if the reel stands 20 and 21 are used on the side opposite to the side connected to the tape counter, the back tension applied to both reel stands 20 and 21 will be approximately equal, making it easier to run the tape in both forward and reverse directions. This is convenient because it can be stabilized.

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.

Therefore, as detailed above, according to the present invention, a head movement mechanism is provided that allows the movement of the head in auto reverse to be performed easily and efficiently, and instead of using a solenoid plunger or the like as in the conventional case. Since auto-reversing can be performed purely mechanically, it is possible to provide a so-called full mechanical type auto-reversing device which is particularly suitable for portable tape recorders.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of an embodiment of an auto-reverse device applied to a cassette tape recorder, Fig. 2 is an overall plan view with the main chassis of Fig. 1 removed, and Figs. j is in Figure 1,
Detailed view of the automatic stop mechanism in Figure 2, Figures 4 a to c
5a and 5b are detailed views of the auto-reverse drive unit shown in FIGS. 1 and 2, and FIGS.
Fig. 2 is an explanatory diagram of the operation of the forward/reverse switching mechanism of the constant speed feed system, Figs. 7 a to h are detailed views of the head moving mechanism shown in Figs. 1 and 2, and Figs. , a detailed view of the auto-reverse frequency limiting mechanism shown in FIG. 2, FIGS. 9a and b are detailed views showing other head movement mechanisms shown in FIGS. 1 and 2, and FIGS. , Detailed diagram of the accidental erasure prevention mechanism in Figure 2 and the 2PLAY operator.
Other layout diagrams of the REC operator, Figures 11a and 11b are detailed diagrams of the forward/reverse switching mechanism of the high-speed feed system in Figures 1 and 2, and Figure 12 applies to Figures 1 and 2. FIG. 3 is a detailed diagram of the tape running display mechanism section. 11...Main chassis, 2...Operation unit, 14...Head slider, 15...Recording/playback head, 151,1
52... Erasing head, 16, 17... Pinch roller,
18, 19... Capstan, 20, 21... Reel stand, 23... Motor, 24, 25... Operating lever, 3
00...Reel constant speed drive system, 400...Capstan drive system, 500...Automatic stop mechanism, 401,402
...Flywheel, 302...Center pulley, 30
3...Right take-up idler, 305...Left take-up pulley, 3
06...Cam wheel, 231...Motor pulley, 1
23b, 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 system forward/reverse switching mechanism, 5
01,502...Left and right detection lever, 504...Cam lever, 505...Automatic stop gear mechanism, 507...Release slider, 509...Select lever, 605...
Reverse lever, 124c...Limit lever, 1
24b... Limit slider, 701... Power leaf switch, 702... Switch slider, 13
0...Lock release unit, 100...Head moving mechanism, 1
01...Head switching slider, 11a...Sub chassis, 15a...Head base plate, 14d...Head gripping member, 102-103...Receiving pin, 104, 10
5...Azimuth adjustment screw, 14f...Erasing head base plate, 122...REW operator, 123...PLAY
(R) Operator, 124...REC operator, 125...
PLAY (F) operator, 126...FF operator, F1
1...Switching lever, F14...High speed Aledra, D13
...Display panel, D15...Friction plate, D15a, D15b
...triangular hole, D21...display window.

Claims (1)

[Scope of Claims] 1. An auto-reverse device for a tape recorder in which the head is movable to first and second positions corresponding to forward and reverse running tracks of the tape,
The head base plate supporting the head is connected to the first and second tape in conjunction with the tape forward/reverse running switching mechanism.
a member that is moved in a direction corresponding to the position of the head base plate, and engages and guides the head base plate at two points corresponding to the first and second vertices of the first virtual triangle on the moving direction of the head base plate. At the same time, a pair of upper engagement guide members restricting the upper part of the head base plate to a position corresponding to the first position, and a pair of upper engagement guide members that restrict the upper part of the head base plate to a position corresponding to the first position; an upper position regulating member for regulating the upper part of the base plate to a position corresponding to the first position; a pair of lower engagement guide members that engage and guide the head base plate at two points and restrict the lower part of the head base plate to a position corresponding to the second position; At one point corresponding to the apex of No. 3, the lower part of the head base plate is
1. An auto-reversing device for a tape recorder, comprising a head moving mechanism having a lower position regulating member that regulates the head to a position corresponding to the position of the tape recorder. 2. The auto-reversing device for a tape recorder according to claim 1, wherein the upper and lower position regulating members are screws for adjusting the azimuth of the forward and reverse running tracks of the tape of the head, respectively.