JPS594777B2 - Tape recorder auto-reverse device - Google Patents

Description

[Detailed Description of the Invention] 20 The present invention relates to a fully mechanical type auto-reverse device suitable for portable tape recorders such as cassette type, and in particular, the device is equipped with a mechanism for limiting the number of times of auto-reverse playback and recording. Regarding.

25. 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. This is particularly useful when recording or playback is required. However, such an auto-reverse device 35
Conventionally known devices use an electromagnetic switching mechanism such as a solenoid plunger, and therefore have the drawbacks of being large and heavy, expensive, and requiring large power consumption.

Therefore, there is a need for smaller size, lighter weight, and lower cost, as well as for portable tape recorders such as force-set type, which are powered by batteries and therefore require lower power consumption. It was not possible to apply an autoreverberation device that uses a structure. 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 object of the present invention is to provide a so-called full mechanical type auto-reverse device suitable for portable tape recorders such as set-type tape recorders, and in particular, it is possible to easily and effectively limit the number of reverses during auto-reverse playback and recording. The mechanism for limiting the number of reverse rotations is characterized by the following characteristics. 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 force setting type tape recorder, and various mechanisms described later are installed at the front and rear, upper and lower, and right and left sides of the main chassis 11, which has a generally U-shaped front. It will be equipped.

The operating section 12 is installed so as to protrude from the front as shown in the figure.
From the left end of the illustration, the ST for Nutoppu and Eject is
OP operator 121, REW operator 122 for rewinding, PLAY (10 operator 123,
REC operator 124 for recording, PLAY (F) for forward motion playback. Operator 125, FF operator 126 for fast forwarding, PAUSE operator 12 for pause (pause)
7 are arranged so that they can be pressed freely in the direction of arrow A and can be returned freely in the direction of arrow LOCA, and each of these operators 12
1 to 127 are respective operation levers 121aJ to 127
Each drive system, which will be described later, can be brought into a driving state via the point a. 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 pushing/pressing operations. . However, the lever 121a of the STOP operator 121 is not locked, but engages with the locking mechanism so as to release the levers of the other operators that are in the locked state. Further, the lever 127a of the PAUSE operator 127 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. In addition, the first pressing operation locks the device in the pressed state, for example, temporarily stopping the reproducing state, and the second pressing operation releases the locked state, for example, returning 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 force direction.

In addition, the PLAY(R) and PLAY(F) operators 12
The levers 123a and 125a of No. 3 and 125 selectively drive a forward/reverse switching mechanism of a constant speed feed system, which will be described later, to run the tape at a constant speed in the forward or reverse force direction, and also to reciprocate in the directions of arrows A and R. The movable 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 moved to a pair described later. capstan 18
, 19, it functions to bring about a regeneration state in the forward or reverse force direction. Here, the recording/reproducing head 15 reproduces (
The head moving mechanism 10 is of course moved up and down with an accurate azimuth angle to enable recording.
The configuration of 0 and its operation will be described in detail later. By the way, with a normal tape recorder, playback in the forward direction (
Naturally, a single PLAY operator is sufficient as long as it can perform recording (recording), but with a tape recorder capable of auto reverb like the one in this invention, playback (recording) can be performed in both forward and reverse directions.
Therefore, two PLAY operators are provided which are independent of each other for the forward and reverse force directions.

Here, if only one of the two PLAY operators is operated, playback (recording) of only that force direction is possible,
When both blades are operated at the same time, so-called auto-reverberation can be performed, and in the case of normal playback (recording), it is only necessary to operate the PLAY operator in the positive force 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 reciprocating recording can be performed with only one force in the forward or reverse direction or 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, the rear force in the figure includes a tape counter 22 connected to the left reel stand 20, a motor 23 that serves as a power source for each drive system, and operation levers 24 and 25 of an auto reverberation number limiting mechanism and a manual reverberation mechanism, which will be described later. has been done.
FIG. 2 is an overall plan view of the tape drive mechanism shown in FIG. 1 with the main chassis 11 removed for convenience of explanation. In particular, in the constant speed drive mechanism section, the reel (constant speed) drive system 300 is It is unique in that it is independent from the drive system 400, and as a result, load fluctuations do not directly affect the caputan, making it possible to achieve high performance characteristics such as wah and the detection part of the automatic stop mechanism 500 can be adjusted 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 31 via a belt 301, and a right take-up idler 303 is pivoted 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. As will be described later, during right feed, the center feed is also applied to the right reel stand 21 via a link mechanism 26 driven by the right play slider 125b connected to the lever 125a of the PLAY (F) operator 125. However, this 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 sides. In addition, the small diameter part of the center tap 302 is passed through a belt 304 that forms a substantially triangular loop with that part as one bottom corner, and is wound to the left at the other bottom corner corresponding to the center tap 302. Puichi 1J30
5 and a cam wheel 306 is provided at the top corner.

Here, the left winding pulley 1J305 is operated by lever 123a of the PLAY(R) operator 123 during left feeding as will be described later.
Left regeneration nulla connected to, driven by Idaichi 123b\
It can be freely moved toward and away from the left reel stand 20 via an operating member 27 that is moved.

Further, the cam wheel 306 constitutes a detection part of the automatic stop mechanism 500, and in this case, the left and right reel stands 20, 21
In either case, it is possible to detect that the system is in a stopped state, and details regarding this will be described later. Furthermore, in FIG.
A pair of left and right flywheels 401 and 402 are connected to each other by a belt 405 in a so-called anti-rolling type.
and a guide plate 403 for it.

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 above-described constant speed drive mechanism, in addition to improving the wow characteristic described above, the knoll head can be driven on the biting side for both left and right feeds, so stable rotation transmission can be achieved and the motor does not reverse. This has advantages in terms of cost and lifespan. 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, auto-reverse operation detects the end of the tape when playing (recording) in the forward or reverse direction and starts playback (in the reverse or forward direction).
This is because it is convenient to first explain the tape end detection provided by the detecting section of the automatic stop mechanism 500 since the tape recording state is automatically switched to the recording state. now,
If the tape is in a right-feeding or left-feeding mode (this assumes that the tape is set in any other operating state than the auto-reverse setting described later), the automatic stop mechanism 500 The condition of the section is as shown in FIGS. 3A and 3B.

That is, the left and right reel stands 20, 21 are each equipped with friction mechanisms 201, 211 at the bottom, as shown in FIG. Left and right detection levers 501 and 502, which are connected with each other with play, are engaged with each other so as to be rotatable. Of these, a dress pin 503 is implanted in the right detection lever 502 and guided by the inner eccentric cam portion 306b of the cam wheel 306. By this,
When the tape is in the right feeding state (FIG. 3a), as the right reel stand 21 rotates in the counterclockwise direction as shown by the arrow, the right detection lever 50 engages with its friction plate 212.
2 is always given a biasing force that tends to rotate in the clockwise direction. As a result, the right detection lever 502 swings within a small range in the clockwise and counterclockwise directions by the dress pin 503 guided by the inner eccentric cam portion 306a of the cam wheel 306 while the tape is in the right feeding state. It's moving. If the end of the tape is reached in this state and the right reel stand 21 stops, the biasing force in the clockwise direction against the right detection lever 502 disappears, so the detection lever 502 is moved as shown in FIG. 3c. It 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,
Conventionally, in this type of automatic stop mechanism, 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.
4, 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 gear 3 provided at the small diameter portion of the center lever 302.
It is meshed with 02a. Here, the gear 302a is directly connected to the motor 23, and the so-called auto-shut-off (A
SO) serves as the driving source for the operation, and the gear mechanism 505
The meshing relationship and operating state thereof are shown in FIGS. 3f to 3j. 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 locking mechanism is finally rotated clockwise to move the release slider 507 in the downward direction as shown in FIG. Release it to stop the tape recorder. In this way, an automatic stop operation can be achieved. 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. 3c) 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 notched gear, so there is a difference in the operation timing), the cam lever 504 is further moved in the clockwise direction. The cam wheel 306 also moves with the same force. 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 when the tape is in the left-feeding state (FIG. 3b), as the left reel stand 20 rotates in the clockwise direction as shown by the arrow, the left detection lever 501 engages with the friction plate 202. Since a biasing force is constantly applied to the lever 502 to rotate it counterclockwise, one end of the bottom side of the right detection lever 502, which was loosely connected during the right-hand feed operation described above, is brought into a connected state, and the right detection lever 502 is connected. In the end, as described above, a bias is applied that causes the rotation to occur in the clockwise direction at all times.

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.

Although the above explanation assumes that the auto-shut-off operation is performed only at the end of the tape, the auto-shut-off operation can be performed even if the tape becomes tangled to protect the tape and each mechanical part. .

Next, to explain the auto-reverse relationship, Fig. 4a
2 shows the auto-reverse drive system taken out from FIGS. 1 and 2, and the levers 123a and 125a for regeneration in the reverse and positive directions are provided with pinch rollers 16 and 17, respectively. , left and right regeneration sliders 123b and 125b that control the right take-up idler 303 and head slider 14 are connected to springs 123c and 125.
c.

Here, the levers 123a and 125a are moved in the direction of arrows by guide pins 123e and 125e that are engaged with guide portions at the front end of the main chassis 11 shown in FIG. 1 and elongated holes 123d and 125d shown in FIG. , and can freely slide back and forth in the loca direction (the same applies to other levers not shown). Further, the head slider 14 and the left and right playback sliders 123b, 125b also have long holes 14a, b, respectively.
, 123f, 125f with guide pins 14c, d, 123
By engaging 125g and 125g, it is possible to freely slide back and forth in the directions of arrows A and R. By the engagement by the above-mentioned null rings 123c and 125c, the head null rider 14 can be driven even when the reproduction levers 125a and 123a are operated in either the forward or reverse force direction.
Left or right playback nullider on the corresponding side 125b, 12
3b can be put into a driving state.

In addition, an operation section 12 used in this type of tape recorder
In this case, the locking mechanism locks the operating lever 123a or 125a with one force at the same time, or even if there is a slight time lag, it locks the operating lever 12 with the other force approximately in one hour.
5a or 123a 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, if auto-reverse (regeneration) is not performed now, the operating levers 123a and 125a for the forward and reverse force directions are connected to both PLA.
If it is locked by pressing the Y(10, (F) operators 123, 125, then both the left and right regeneration sliders 123b, 125b will move in together, as shown in FIG. 4A, b). It attempts to enter the driving state, but one of the forces is blocked midway by a substantially T-shaped reverse drive lever 601 rotatably provided approximately in the middle of the two, and the motor enters the standby state. One of them is allowed to enter and the force is regenerated.

Here, it is assumed that the regeneration state is performed in the right feed force direction, that is, in the positive force direction, as shown in FIG. The forward/reverse switching mechanism 600 of the constant speed feed system is set so that when both are determined and operated simultaneously, the positive force direction is given priority for reasons that will be described later.

) Then, in this state, the gear lock lever 603, which is always biased by the spring 602 (see FIG. 4a) so as to rotate in the clockwise direction, is forced to move in the direction of the right regenerative slider 125b. Therefore, it is rotated in the biased direction from the stopped state shown in FIG. The reverse drive lever 601 is held at a position upward to the right in the figure (this is referred to as a first position), and the left end of the reverse drive lever 601 also prevents the left regeneration slider 123b from entering. Also, as one end of the link mechanism 26 described above falls into the recess 125b-1 of the right reproducing slider 125b which is allowed to enter at this time, the right take-up idler 303 connects to the small diameter part of the center tap 1J302 and the right reel stand. 21 is changed from the previously separated state to the contact state, and the above-mentioned rightward feed run, that is, regeneration in the positive force direction is performed. (This is used in the forward direction operating lever 12 shown in FIG.
The same applies when 5a is operated. ) When the end of the tape arrives in such a positive force direction playback state, the detection section of the automatic stop mechanism 500 operates as described above, but in this state, the gear lock lever 60
3 is rotated in the clockwise direction from the stop position shown in FIG.
The spring 508 (Fig. 4a) is
However, since the approximately L-shaped automatic stop select lever 509, which is normally biased to rotate counterclockwise, is rotated clockwise, the select lever 5
09 is placed in a position opposite to one end of the lever 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.
Instead of performing the auto-shutoff operation as described above, the lever lever 605 is now rotated 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 in the counterclockwise direction, so that the cam portion of the reverse gear mechanism 604 by the one end 603a of the gear lock lever 603 6
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 includes 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 that has 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. (including when it is in a regeneration state in a predetermined direction), the rebarne gear B6
The notch 604d of O4e is the center pulley gear 30.
2a, both gears 604e, 3
02 are in a state where they do not mesh.

In this state, when the end of the tape is reached and the engagement of the gear mechanism 604 by the gear lock lever 603 is released as described above, the reverse gear A6O4c is rotated slightly counterclockwise due to the reaction. As a result, gear B6O4e also rotates slightly in the direction of the same force, so gear B6O4e and gear 302a come to mesh with each other. Then, if the center pulley gear 302a rotates regardless of tape running, it serves as a driving source for this auto-return action as well as for the automatic stop action, so the rotation is transmitted to the gear mechanism 6'04. The reverse drive lever 601 is moved from the state shown in FIG. 6b to the state shown in FIG. 6a.
This causes the state to shift to the state shown in . That is, the rivane 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 rivane drive lever 601 is moved. When moving to the second position, the notch 604d of the riverine gear B6O4e is again inserted into the center pulley gear 30.
Both gears 604e, 302a are opposite to 2a.
The original state is that they do not mesh. In this way, when the reverse drive lever 601 reaches the second upward left position, the left regeneration 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.
The regeneration state is such that the leftward feed direction, that is, the reverse force direction, is shown in FIG.

In this case, as the lever 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 its locking portion 1.
The lever 25b-2 is pressed by the left end of the lever 601 and returned to the lower blade direction as shown in the figure, and is in a standby state. Also, the operating member 27, which had fallen into the tip key-shaped portion 123b-1 of the left reproduction nullider 123b, which was allowed to enter at this time, is released and rotated in the clockwise biased direction by the spring 27a. The left winding pulley 305, which had been in the detached state until then, is brought into contact with the left reel base 20, and performs the leftward feeding run as described above, that is, regeneration in the opposite force direction. When the end of the tape arrives in such a reverse force direction playback state, the automatic stop mechanism 500 starts again.
Since the detecting section of is activated, the regeneration state can now be switched from the reverse force direction to the positive force direction (Fig. 4b) in the same manner as the regeneration state was switched from the positive force direction to the reverse force direction as described above. Become,
Thereafter, unless the STOP operator 121 is operated to stop the tape recorder, the 0-3 reverse playback state will be repeated any number of times. Therefore, in the so-called full mechanical type described above, auto-reverse can be achieved by a constant-speed feed system that includes a reverse drive lever 601 that directly switches to the normal and reverse playback state and a reverse gear mechanism 604 that works together. The forward/reverse switching mechanism 600 selectively transmits the rotational force from the motor 23, which is an essential drive source for the tape recorder, through the center pulley gear 302a. When the drive lever 601 is pressed, the regeneration slider 123b or 12
5b is in the driving state, and the regeneration Nurider 12 is regenerated by another force.
5b or 123b in the standby state, such a fully mechanical type auto-reverse device corrects the drawbacks of conventional ones using electromagnetic switching mechanisms such as solenoid plungers. It can be seen that the present invention is suitable for a portable tape recorder such as a force setting type.

In addition, such an auto-reverse device is a 2P
Since it is a LAY button type, there is also the advantage that normal one-way playback can be performed in any direction of force. Next, in the above, both PLAY
Explaining the right feed priority mechanism that gives priority to right feed travel when the (R) and (F) operators are operated at the same time.As mentioned above, this mechanism always keeps the Livas 1 drive lever 601 in the same position when stopped. This can be achieved by setting the

That is, this is the gear mechanism 604 that cooperates with the reverse drive lever 601 shown in FIGS. 4a-c and 5A and b.
This is achieved through the engagement/disengagement relationship between a constant speed forward/reverse switching mechanism 600 including a power supply leaf switch 701 and a switch slider 702. Here, Nuituchinu Rider 7
02 is the STOP operator 121 and the PAUSE operator 1
It is driven in conjunction with all the other operators except 27, closes the power leaf switch 701, and is in charge of supplying power to the motor 23. And, as mentioned above, auto-reverse is the left and right playback slider 1.
This is done by allowing one of 23b and 125b to enter and blocking the other, but both PLAY(R
), (g) When the operators 123 and 125 are operated simultaneously, one end 603a of the gear lock lever 603 is moved to the cam portion 604a of the lever gear mechanism 604 from the timing when the left and right regenerating sliders 123b and 125b engage with the lever drive lever 601. Since the timing at which the reverse drive lever 601 engages is early, the power leaf switch 70 is activated when the reverse drive lever 601 is in the first position on the upper right side as shown in FIG. 6b.
There is no engagement with 1, and the rightward feeding state as described above is maintained. When stopped, leave drive lever 601
When the reverse drive lever 601 is in the second upward left position shown in FIG. When the Nurider 702 returns and leaves the power leaf switch 701, the spring drive lever 60 is moved by the elasticity of the power leaf switch 701 itself.
1 is struck and the power is kept on until it is reversed to the first position upward to the right as shown in FIG. Therefore, both PLA
If the Y(10, (F) operators 123 and 125 are operated at the same time, priority will always be given to right feed travel.In addition, such a right feed priority mechanism normally allows tape loading to be performed when right feed is performed. In other words, it is done in a state where the force is in the positive direction, and when attempting to perform an auto-reverse operation, both PLAY(R) and (F) controls 123 and 125 are normally operated at the same time. Therefore, it is possible to perform rational operations without being constrained by such assumptions.

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), (E) operator 123,
Of course, if you operate it together with the 125, you can perform back-and-forth recording using Autoreverb.

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

In other words, when performing autoreverberation recording, it is convenient to perform one recording in each forward and reverse force direction, that is, to limit the force to only one reciprocating recording. Furthermore, when performing auto-reverse, it is necessary to limit the number of reversals not only during recording, but also during playback.

In other words, there are cases where only one reciprocating reproduction is to be performed from the beginning, or cases where it is desired to perform auto-reverberation several times and perform auto-reverberation only once before stopping. Here, a reversing number limiting mechanism is required to limit the number of auto-reverses when required by external operation. Therefore,
Next, a description will be given of the liberne number limiting mechanism provided for such a purpose.The operating lever 24 shown in FIG.
By rotating the limit lever 124c in the clockwise force direction shown in the figure, 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 FIG. Since one end of the reverse lever 605 is engaged with -1, the position is regulated while maintaining a biasing force in the left direction. Then, the playback or recording state in the positive direction similar to the playback in the positive direction as described above progresses, and at the end of the tape, the automatic stop mechanism 500 is activated and the reverse lever 605 is rotated in the clockwise direction. Then, as described above, the right playback slider 125b is finally retreated to the standby state, and the left playback slider 123b is advanced to enter the playback or recording state of left feed travel, that is, in the opposite force direction, as shown in FIG. 5b. can be switched to Play right here Nuraida-112
The proximal end pin portion 124 of the limit slider 124b is given a biasing force in the left force direction to the concave portion 125b-3 during the retraction process of the limit slider 124b, so that it can slide freely in the left and right directions as shown in the figure.
By falling b-2, the right playback slider 1
25b is prevented from being re-entered. 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 as shown in the figure, and the automatic stop select lever 509 is activated to engage the lock release part 130. By rotating it to the opposite position, the auto shut-off operation by the automatic stop mechanism 500 is performed when the end of the tape is reached in the playback or recording state in the opposite force direction, so that there is always only one forward and reverse reciprocation. It can be used as a recording. 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, such a reverse number limiting mechanism requires only a simple mechanism to be added to the above-mentioned full mechanical type auto-reverse device, so it is suitable as an accessory device for the auto-reverse 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 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 use it, but you can use the number-limit or permanent auto-reverse depending on the various uses. It is convenient because you can Moreover, the reversing number limiting mechanism can perform the reversing number limiting operation even when the manual reversing operation lever 25, which will be described later, is operated, that is, even in the middle of the manual reversing. In either case, the final result is right → left → stop or left →
Since the robot stops in the same manner as right → left → stop (when the reverse force direction PLAY (B) operator 123 is operated with priority), it is easy to determine what state it is in functionally. However, when the REC operator 124 is set to both PLAY
(F) When operated together with the operators 123 and 125, that is, when performing auto-reverse recording, the number of reverses is automatically set to one reciprocating recording without having to operate the operation lever 24 of the reverberation number limiting mechanism from the outside as described above. It can be said that it is advantageous to have the ability to prevent erroneous recording, or erroneous erasure, by limiting the number of recordings.

Therefore, next, for auto-reverse recording, the REC operator 124 and both PLAY (R), (F) operators 123, 12
5 at the same time (provided that 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 that operates when the end of the tape is detected, the right playback slider 125b that enters during right feed and retreats when left feed, and the operating lever 124a of the REC operator 124, respectively. The limit slider 124b' is provided 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 function of the limit slider 124b in FIG.
As in the above case, the operation lever 124a of the remaining REC operator 124 is operated by dropping the tip pin 124B of the limit nuller 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 in the left direction as shown in the figure, is moved as described above when detecting the end of the tape during rightward recording. Release the position restriction and slide the control lever 124 in the left direction as shown in the figure.
The tip pin 124d is depressed into the concave portion 124c of a. This keeps the limit lever 605 rotated in the clockwise direction as described above, and then performs an auto-shutoff operation at the end of the tape during left feeding, as shown in Figure 8b. By closing, it is possible to limit the recording 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. This is because when the tape is running in the force direction with auto reverse set, the detection part of the automatic stop mechanism 500 is activated when the end of the tape is reached. This allows tape running to be reversed at any time without waiting, and this is useful in many ways in actual auto-reverse use.

For example, when auto-reverse is playing music on a certain track on a tape, there are cases where a song on another track is played 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 9]1 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 as shown in the figure. With this, the direction of the tape running force 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 and the recess 101a at the tip,
The first and second levers taken by the lever 601
A head switching slider 10 that can slide freely in the left and right directions so as to take an off-right 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. It's not related. However, the head mount plate 1 is attached to the head null rider 14 via an appropriate number of supports 14a and has erasing heads 151 and 152, which will be described later, at both ends.
Head switching lever 1 rotatably supported with respect to 4b
4c has a substantially 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 lever 101. The head gripping member 14d controls the sliding movement of the head switching slider 101 in the left and right direction of the recording/reproducing head 15.
It is independent of the sliding system of the head slider 14 in the longitudinal force direction. 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.
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 optimum 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 adjusted in advance via springs 106 and 107 so that the azimuth of the recording/reproducing head 15 is in the optimum state in the upper and lower directions, respectively, by adjusting the head base plate 15a which has been vertically positioned. This is for independent adjustment between the two. In FIGS. 7C and 7d, the reverberation 1 drive lever 601 is in the second and first positions, respectively, so that the recording/reproducing head 15 is moved up and down to feed the tape to the left and to the right. It shows the case. Furthermore, FIGS. 7E and f show right-hand feed from the side force, that is, the state in the middle when the recording/reproducing head 15 is moved downward, and the state at the stop position, and G and h in the same figure show left-hand feed or 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 has a switching spring 108 supported on a head switching slider 101, which is connected to the vertical movement of the head 15 so that when the head is a stereo head, it corresponds to channels (1) and 00 of a stereo tape. A head changeover switch 109 is provided for switching between erase heads 151 and 152, but the former is not necessary when only monaural tapes are used.

According to the above-described head movement mechanism, in an auto reverb system that performs back-and-forth recording or playback by running the tape forward and backward, the alignment can be adjusted independently of each other in advance to accommodate the deviation in tape running during the back-and-forth movement. Because you get
Compared to the conventional fixed head, which can accommodate only one edge, both edges can have the optimum azimuth, and the recording/reproducing head itself may be a normal one, which is particularly expensive.

Also, in the past, there have been some devices of this type that use solenoid plungers to adjust the azimuth.
In this case, it was impossible to solve the wobbling on both the left and right sides of the head, but with the above structure, the head base plate 15 can be fixed using 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 saw taper pin fits into the engagement hole of the head base plate to guide and regulate the position, so there is no movement on both the left and right sides. It is possible to eliminate the stickiness. 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 sway and play in the left and right direction of force. By the way, in the head moving mechanism 100 as described above, the pair of left and right erasing heads 151, 152 are fixed (in this case, each head surface is associated with the upper or lower position), but in reality they are automatic. It satisfies the contradictory demands of increasing the amount of insertion of the erasing head into the tape surface in order to increase the erasure rate during reverse (recording), but on the other hand, reducing the amount of insertion of the erasing head in order to improve the wah characteristics. It is desirable to have the power to do so.

Next, a description will be given of a mechanism for controlling the amount of thrust of the erasing head that can satisfy such requirements.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 1 drive lever 601. As a result, the erasing head base plate 14f is rotated clockwise (FIG. 9a) or counterclockwise depending on the first and second positions of the lever 1 drive lever 601, regardless of the head slider 14 or the head mount plate 14b. Since it is rotated as shown in the clockwise direction (Fig. 9b), the erasing head 15
The amount of thrust into the tape (4) of 1,152 is the recording/playback head. 15 as a reference, the downstream side is made smaller than the upstream side.In other words, for example, when feeding to the right, the amount of thrust of the left erase head 151 is made smaller than that of the right erase head 1.
52 by a predetermined amount to fully satisfy the erasure rate, and reduce the load on the downstream side, which is one of the major causes of wow, to improve the wow characteristics. Similar effects can be obtained during feeding, with a completely opposite relationship. In addition, 14h in FIGS. 9A and 9B is a pad that comes into contact with the spring 14g for regulating the amount of rotation of the erasing head base plate 14f, and 141 is a concave portion at the lower end of the erasing head base plate 14f. 14j to slide the head switching nullider 101 in the left-right force direction. In this case, the erasing head on the unused side should be moved back a lot! Erasing head base plate 14
If the amount of rotation of f is increased, it is also possible to use a magnetic erase head, which can be cheaper than an AC type erase head. Next, to explain the mechanism for preventing erroneous erasure, FIG. 10a shows the erasure prevention mechanism taken out from FIG.
24a is a locking portion 124n projecting left and right at the rear end;
1240 is formed.

A substantially crank-shaped left claw or right claw detection lever 124f is engaged at one end with each of these locking portions 124n, 1240 and biased in the counterclockwise or clockwise direction by springs 124p, 124q. , 124g are rotatably provided. In addition, these detection levers 124f, 1
24g denotes left and right recording prevention levers 1 which are rotatably supported alternately via wire rods 124h and 1241.
24j and 124k. Furthermore, 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 123b5 and 125b-5 formed at corresponding portions of the left and right reproduction sliders 123b and 125b. In the figure, Wl and W2 are a pair of left and right detection windows formed at the rear of the case of the force setting tape (CT). When 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, the lever 124a engages with the locking portions 124n and 1240 and its position is restricted. Left and right claw detection levers 124
f and 124g are free to rotate in the respective biasing force directions. One end of each of these detection levers 124f, 124g attempts to enter the detection windows W, W2 of the force setting tape (CT), but the detection windows Wl, W2 are blocked by so-called accidental erasure prevention claws. If the claw is cut off, entry will be blocked, and if the claw is cut off, entry will be 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 pinching manner at its other end, is rotated. The portion 123b-5 or 125b-5 is moved from the position indicated by the solid line in the figure to the position indicated by the broken line in the figure. As a result, one or both blades of the left and right playback sliders 123b and 125b are prevented from entering (equivalent to no claws) or allowed to enter (equivalent to having claws), and in either case, It is also possible to prevent recording on the side without the erroneous erasure prevention claw, that is, erroneous erasure. That is,
In this way, accidental erasing is prevented, but unlike normal ones, the REC operator can be operated at any time regardless of the presence or absence of the accidental erasing prevention claw, and the REC operator can be operated at any time regardless of the presence or absence of the accidental erasure prevention claw.
The Y operator cannot be operated.

As a result, even if the nail is set with one-sided bending force setting tape,
It is possible to record by reversing the loading of the power set tape without reversing it in any way. Also, in this case R
Left and right PLs are placed on both sides of the EC operator 124 in the center.
Since the AY(R), I') operators 123 and 125 are arranged, the relationship with the force setting tape is easy to understand and operations are easy to perform. The entire erroneous erasure prevention mechanism is symmetrical, which is advantageous in terms of design and manufacturing (particularly of the mold, etc.). 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. The same can be said when one half of the mechanism is applied to prevent normal erroneous erasure.

Also, in this case, a degree of freedom in design is ensured, and it is particularly suitable for an upright 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.
Engagement portions 122b protrude inside the respective operating levers 122a, 126a of the W operator 122 and the EF operator 126.
, 126b, and is rotatably supported at approximately 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 which can be selectively moved into and out of contact with these. Therefore, as shown in FIG. 11b, for example, the lever 12 of the EF 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 in the counterclockwise direction. Then, since the idler support lever Fl3 is rotated in the clockwise force direction via the spring mechanism Fl2, the high-speed idler Fl4 is in contact with both the right flywheel 402 and the right reel stand 21, and the high-speed idler Fl3 is rotated in the clockwise force direction. A forward or fast forward state is achieved. In this case, the PLAY (
F) When the FF operator 126 is operated in a state where the force direction has been regenerated by operating the operator 125, the other end of the switching lever Fl1 engages with the high speed slider Fl5 and moves it along the arrow shown in the figure. In order to push back in the force direction, the tip engaging portion Fl6 of the high-speed slider Fl5 moves the engaging portion 14k of the head slider 114, which is pushed from the position shown by the broken line J (when stopped) to the position shown by the solid line shown in the drawing. Since it is pushed back slightly toward the front, a so-called "key" operation is possible. In addition, the operating lever 122a of the REW operating element 122 may be operated alone or the PLAY(R) operating element 123 in the left force direction.
When operated in combination with the above, the operation is opposite to that described above, and the rewind state or the review state can be achieved. 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 when performing a single-key operation or a single-review operation, but as described above, it can be done with a single switching lever. . 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 features of the operating mechanism that enables the auto-return function as described above, the REC operator 12 as explained in FIG.
With 4 in the center, right and left PLAY(R),
(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. Regarding the arrangement of the REC control and the left and right PLAY (10, (F)) controls,
As shown in FIG.
), (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 inside the broken lines in the illustration for each purpose. , auto-reverse recording or playback or desired single-direction 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.
A pulley Dl2 is connected to 0 and 21 via a belt Dll.

This pulley Dl2 is integrally formed with a display board Dl3 having a striped part Dl3a on the upper part, and a shaft Dl3 is formed at the center of the display board Dl3.
4, the tip of a shaft Dl4 protruding from the display panel Dl3 is engaged with a friction plate Dl5. Here, friction plate D
l5 is approximately pot-shaped, and near the periphery of its large interior are two triangular through holes Dl5a and D with their tops facing each other.
l5b, and a long hole Dl near the periphery of the small inside.
5c is formed, and the axis Dl4 is formed at the center of the large interior.
is supported by the compression spring D for torque adjustment from the top.
A stopper Dl7 and a retaining ring Dl8 are applied so that a braking force is applied by the stopper Dl6, and in this state, a stopper Dl9 is engaged with the elongated hole Dl5c in the small interior. and,
A display window D2l is formed in the upper tape recorder casing D2O, which corresponds to a substantially intermediate portion of the triangular holes Dl5a and Dl5b of the friction plate Dl5. Thus, in the above configuration, if the left or right hand wheel bases 20, 21 are rotating in either direction of force, the rotational force is transmitted, thereby rotating the display panel Dl3. Along with this, the friction plate Dl5 also tries to rotate, but the long hole Dl5c in the small inside of the friction plate Dl5 also tries to rotate.
Since the stopper Dl9 is engaged with the elongated hole, the stopper Dl9 is regulated and nipped at the position where the stopper Dl9 contacts the end of the elongated hole. It is assumed that this slip position is set so that either of the two triangular holes Dl5a or Dl5b in the large interior of the friction plate Dl5 is 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 Dl3 of the display panel passes through either triangular hole Dl5a, Dl5b of the friction plate Dl5.
The rotational state of a is the rotational force direction of the reel stand 20 or 21 (tape feeding force direction) and its rotational speed (constant speed or high speed)
Accordingly, the results are observed as shown in FIGS. 12b-e. That is, B and c are in the right-forward playback and left-forward playback states, and the intervals between the striped portions Dl3a are relatively wide, that is, the movement of the striped portion Dl3a is slow, and D and e are in the fast forward (FF) and rewind (FF) states.
REW) state, the intervals between the striped portions Dl3a are narrow, that is, the striped portions Dl3a move quickly. In this case, since the direction of the top of the triangular hole Dl5a or Dl5b of the friction plate Dl5 visible from the display window D2l represents the tape feeding direction, the feeding force direction and constant speed are high in combination with the state of the striped portion Dl3a described above. You can easily identify which one is, and also know what state it is in. Furthermore, reel stand 2
The rotational speed of 0 or 21 changes depending on the tape winding amount, but the movement of the striped portion Dl3a follows this, so the tape (
It can also be used as a guide to know the amount remaining. Of course, during stop or pause operations, any triangular holes Dl5a, D can be accessed from the display window D2l.
I can't see l5b either, so I know it's in that state. 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 and 21 are used on the side opposite to the side connected to the tape counter, both reel stands 20 and 21 can be connected to the tape counter.
This is advantageous because the back tension applied to the blades 21 becomes approximately equal, making it possible to more stably run the tape in both the forward and reverse directions. 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 described in detail above, according to the present invention, a reverberation number limiting mechanism is provided which can easily and effectively limit the number of reverberations during autoreverberation playback and recording. Since autoreverse can be performed purely mechanically without using a plunger or the like, it is possible to provide a so-called full mechanical type autoreverse device that 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 autoreverberation device applied to a force setting type tape recorder, Fig. 2 is an overall plan view shown with the main chassis removed from Fig. 1, and Fig. 3a. -j is a detailed view of the automatic stop mechanism shown in Figures 1 and 2, Figures 4 a-c and Figures 5 A and b are detailed views of the auto reverse drive part shown in Figures 1 and 2, and 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; FIGS. 7a-h are detailed views of the head moving mechanism shown in FIGS. 1 and 2; 8A and 8B are detailed views of the auto-return number limiting mechanism shown in FIGS. 1 and 2, and FIGS. 9A and 9B are detailed views showing other head movement mechanisms shown in FIGS. Figure 10a-
e is a detailed view of the rock structure to prevent accidental erasure in Figures 1 and 2, and 2P.
Another layout diagram of the LAY operator and REC operator, Figure 11A
, b 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. 11...Main chassis, 12...Operation section, 14...Head nut rider 15...
... Minute read head, 151, 152... Erase head, 16, 17... Pinch roller, 18, 19
... Capnutan, 20, 21 ... Reel stand, 23 ... Motor, 24, 25 ...
...Operation lever, 300... Reel constant speed drive system, 400... Capnutan drive system, 500...
... Automatic stop mechanism, 401, 402 ... Flywheel, 302 ... Center tap one, 30
3...Right take-up idler, 305...Left take-up pulley, 306...Cam wheel, 231
...One motor tap, 123b, 125b...
...Left and right regeneration nullider 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 ...
1st movement stop and gear mechanism, 507... Release nullider 509... Select lever, 605...
...River Nureba 1 124c...Limit Nureba 1, 124b...Limit Nureda 1, 7
01...Power supply wharf switch, 702...
...Switch slider 1, 130...Lock release unit, 100...Head moving mechanism, 101...
...Head switching slider, 11a...Sub chassis, 15a...Head base plate, 14d.
...Head gripping member, 102, 103...
・Receiving pin, 104, 105...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, Fll...Switching lever Fl4
...High speed idler, Dl3...Display panel, Dl5...Friction plate, Dl5a, Dl5b...
...Triangular hole, D2l...Display window.

Claims (1)

[Claims] 1. first and second movable members that are individually linked to both forward and reverse playback operators to position each pair of pinch rollers and winding rotating body in positions corresponding to the respective operating states;
a switching member that is mutually associated with the first and second movable members when both of the playback operators are operated;
A cam wheel that constantly rotates regardless of the rotation of the pair of tape winding rotors, and a biasing force is selectively applied as the pair of tape winding rotors rotate, and at least one of the cam wheels follows the cam of the cam wheel. a pair of tape running end detection members connected to each other so as to swing and stop swinging on the swinging side when the pair of tape winding rotors stop rotating; and a tape running end detecting member on the swinging side. The operator is operated through a tape end detection mechanism including an actuation member that operates when the detection member stops swinging, and an automatic stop control member that selectively engages with the actuation member of the tape end detection mechanism. The tape is moved in conjunction with the tape running motor through an automatic stop mechanism that cancels the state and brings it to a stopped state, and a reverse operation control member that selectively engages the switching member with the operating member of the tape end detection mechanism. Controlling the first and second movable members to two positions by the rotational force of an unrelated rotary body, and in the first position, one of the first and second movable members is put into an operating state and the other is put into a standby state, and the second movable member is put into a standby state. a switching mechanism that switches one of the first and second movable members to a standby state and the other to an operating state at position 2, and an operating member of the tape end detection mechanism in a state in which both of the playback operators are operated; a reverse operation control mechanism that is capable of engaging the reverse operation control member only in the operation state and engages the automatic stop control member in other operating states; and a reverse operation control mechanism that selectively engages and engages the reverse operation control member. and a switching operation mechanism for forcibly switching the operating member of the tape end detection mechanism to a state in which it can be engaged with the automatic stop control member even when both of the playback operators are in an operating state. Features an auto-reverse device for tape recorders.