JPS6212575B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to simplify the configuration by switching a pair of pinch rollers toward and away from the capstan shaft without using a special drive source.
This invention relates to an auto-reverse device for a reel-type tape recorder.

Conventionally, most auto-reverse devices have been configured to use an electromagnetic plunger to switch a pair of pinch rollers toward and away from a capstan shaft. This plunger must be strong because it must pull the pinch roller away from the capstan shaft against the pressure force applied to the capstan shaft, which poses a problem in reducing the overall size of the tape recorder. Another disadvantage was that the plunger needed to be large and required a large amount of current to drive it. Furthermore, the switching mechanism for selectively rotating the pair of reel shafts has a complicated structure, which inevitably increases the size of the tape recorder as a whole.

The present invention was made based on the above circumstances, and its purpose is to mechanically detect a change in the rotational direction of a motor that rotationally drives a capstan shaft in an auto-reverse device for a two-reel tape recorder. The transmission path of the rotational force of this motor is switched from one reel shaft side to the other reel shaft side, and at the same time, the rotational force of the motor is used to switch the pair of pinch rollers toward and away from each capstan shaft. In this way, the purpose is to simplify and downsize the configuration.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below based on embodiments shown in the drawings.

First, the embodiment shown in FIGS. 1 to 6 will be described. FIG. 1 shows the mechanism of a tape recorder equipped with an auto-reverse device, in which a pair of reel shafts 2A, 2B and a pair of capstan shafts 3A, 3B are rotatably mounted on the top side of a board 1. There is. Each of the reel shafts 2A, 2B is provided with operating gears 4A, 4B as operating rotating bodies at a lower position so as to rotate together, for example, via a friction transmission mechanism.
A drive rotating body 5 is rotatably mounted at a position equidistant from 4B. The drive rotary body 5 is composed of two integrated drive gears 6 and 7, large and small, and is supported by a single shaft 5A with the large gear 6 facing upward. An engagement pin 8 is provided on the upper surface of the large gear 6, and a central portion of a rotating member 9 is rotatably supported on the upper end of the shaft 5A. An intermediate gear 10 as a rotating body is rotatably installed. This intermediate gear 10 is always meshed with the large diameter drive gear 6. The rotating member 9 is urged in the same direction as the rotating direction of the driving gear 6 by the rotational force of the driving gear 6, so as to selectively mesh the intermediate gear 10 with either one of the operating gears 4A or 4B. It's getting old. A transmission gear 11 is rotatably mounted on the substrate 1. This transmission gear 11 meshes with the large-diameter drive gear 6, and its shaft 11A protrudes toward the back side of the substrate 1.
A pulley 12 is attached to this projecting end.

At each lower end of the capstan shafts 3A and 3B,
On the back side of the substrate 1, a flywheel 13A,
13B is attached. In the figure, reference numeral 14 denotes a reversible motor for rotating both capstan shafts 3A and 3B, and a motor pulley 15 attached to the rotating shaft of this motor 14, a flywheel 13A,
13B, and an endless belt 16 is wrapped around the pulley 12, and both capstan shafts 3A,
3B is rotationally driven in the same direction as the motor 14, and the transmission gear 11 is rotationally driven in the opposite direction to the motor 14,
Furthermore, the drive rotor 5 meshing with the transmission gear 11 is driven to rotate in the same direction as the motor 14. In the figure, 17A and 17B are each capstan shaft 3
Pinch rollers are provided corresponding to A and 3B, and pinch arms 18A and 18A support the pinch rollers.
8B is rotatably mounted on the substrate 1 via shafts 19A and 19B. Each pinch arm 18A,
18B connects the pinch rollers 17A, 17B to the capstan shafts 3A, 3 by a spring (not shown).
It is rotatably biased in the direction of bringing it into pressure contact with B. Also, on the top surface of the board 1 are both capstan shafts 3.
A switching lever 21 is rotatably mounted via a shaft 20 provided at positions equidistant from A and 3B. This switching lever 21 is connected to each pinch arm 1.
Pressing pin 2 located near the rotation end of 8A, 18B
2A and 22B, and when rotating clockwise in FIG. 1 about the shaft 20, one pressing pin 2
2A presses the pinch arm 18A in the opposite direction to separate the pinch roller 17A from the capstan shaft 3A, and when rotating in the opposite direction, presses the pinch arm 18B in the opposite direction with the other pressing pin 22B. and attach the pinch roller 17B to the capstan shaft 3B.
It is configured to be separated further. Further, at another location on the board 1, an L-shaped rotating lever 23 is mounted on a shaft 23.
The rotary lever 23 is rotatably mounted via the lever A, and one end of the rotary lever 23 is connected to one end of the switching lever 21 via a connecting lever 24. Note that a bifurcated engaging portion 25 is provided at the other end of the rotating lever 23. In the figure, 26A and 26B are rotary levers 23
The stopper restricts the rotation range of the rotation lever 2.
3 is stably held by a toggle spring 27 in a position where it abuts either one of the stoppers 26A or 26B. The switching lever 21, the rotating lever 23, and the connecting lever 24 constitute a pinch roller switching mechanism 28, and when the rotating lever 23 is on the one stopper 26A side as shown in FIG. is capstan shaft 3
A, and when the rotating lever 23 rotates toward the other stopper 26B as shown in FIG.
2A separates it from the capstan shaft 3A,
At the same time, the other pinch roller 17B comes into pressure contact with the capstan shaft 3B. Further, the connection lever 24 is provided with a switch operation section 24A.

In the figure, reference numeral 29 denotes a roughly L-shaped head mounting plate that is slidably mounted on the board 1. A magnetic head 30 is mounted on the top surface of this mounting plate 29 at a position equidistant from both capstan shafts 3A and 3B. can be,
It is guided by the shafts 19B, 20, etc., and can freely slide in the left and right directions in FIG. In addition, each pinch arm 1 is provided on the upper surface of the head mounting plate 29.
Press pins 31A, 31 are placed near 8A, 18B.
B is provided, and when moving to the right in FIG. 1, these pressing pins 31A, 31B press the rotating ends of both pinch arms 18A, 18B in the opposite biasing direction, and both pinch rollers 17A, 17B are It is configured to be held at a position spaced apart from the capstan shafts 3A, 3B. In addition, this head mounting plate 2
A tension spring 32 is suspended between the mounting plate 9 and the substrate 1, and the mounting plate 29 is always biased toward the left in FIG. 1 by the spring 32. Further, an arc-shaped cam surface 33 is formed at one end of the mounting plate 29.

In the figure, reference numeral 34 denotes a polarity reversal switch for changing the polarity of the head terminal of the magnetic head 30. The switching button 34A of this switch 34 engages with the switch operating portion 24A of the connecting lever 24, and the pinch roller switching mechanism 28 When the pinch rollers 17A, 17B are switched toward and away from the capstan shafts 3A, 3B, the switch 34 is operated simultaneously.

A plate-shaped transmission member 35 that is long in the vertical direction in the figure is disposed on the upper surface of the substrate 1. This transmission member 35
The guide pins 37A and 37B are inserted into the long holes 36A and 36B provided at both ends.
It is slidable in the longitudinal direction within the ranges A and 36B, and has a rack 38 and a protrusion 39 on one side, and a pair of engagement pins 40 on the top surface.
A, 40B and an operation pin 41. The transmission member 35 is adapted to mesh the rack 38 with the small gear 7 of the driving rotary body 5 as appropriate, but is normally kept at the uppermost position in the figure (the first position) by the toggle spring 42.
) or in a position where it is stably held at the lowest position (FIG. 4) and does not engage with the drive rotor 5.

In the figure, reference numeral 43 denotes an engagement member that constitutes a transmission mechanism 44 together with the transmission member 35, and one end of this member 43 is rotatably mounted on the upper surface of the substrate 1 via a shaft 43A. Further, the engagement member 43 is provided with a long hole 45, into which an engagement pin 46 attached to the rotating member 9 is inserted to interlock with the rotating member 9. . Further, the rotation end of the engagement member 43 is connected to both engagement pins 40A, 4 on the transmission member 35.
0B to the upper surface side of the driving rotary body 5 (upper surface side of the large gear 6), and is adapted to move onto the rotation orbit of the pin 8 as the rotating member 9 rotates.

47 in the figure is a fast-forward operation lever, and this lever 4
7 is attached to the upper surface of the substrate 1 so as to be slidable vertically in the figure, and is normally held at the lowest position shown in FIG. 1 by a tension spring 48. The fast-forward operation lever 47 has a cam pin 49 and a locking pin 50 on its upper surface, and the cam surface 33 of the head mounting plate 29 is connected to the cam pin 49 by a spring 3.
The position of the magnetic head 30 is regulated by pressing the magnetic head 30 into contact with the elastic force of the magnetic head 2. When the operating lever 47 is pushed upward in FIG. 1 against the spring 48, the cam pin 49 slides into contact with the cam surface 33 and pushes back the head mounting plate 29, causing the magnetic head 30 to move upward in the figure. It will now move you backwards to the right. Also, on the top surface of the board 1, there is a fast-forward operation lever 4.
7 and the transmission member 35, a hook 51 made of a plate spring is rotatably mounted via a pivot shaft 52. As shown in FIG. 6, this hook 51 is constantly pressed against the top surface of the board 1 by a coil spring 53 wound around a pivot shaft 52, and at the same time is urged to rotate clockwise, and the right edge is moved in the fast forward direction. It is brought into contact with the locking pin 50 of the operating lever 47. The hook 51 also has a locking recess 54 on its right side edge for holding the fast-forward operating lever 47 in the pushed-in position, and a cam-like projection 5 on the front side of the recess 54.
5. Left adjacent position of recess 54 and cam-shaped protrusion 55
A release piece 5 cut diagonally upward at a position adjacent to the right side of
6, 57, and a release cam 58 projecting downward in a V-shape on the left side edge. In addition,
The release cam 58 is located on the path of a protrusion 39 provided on the transmission member 35, and when the transmission member 35 moves upward or downward, it slides into contact with the protrusion 39 and moves the entire hook 51 upward. It is designed to bend. 6, when the hook 51 is bent upward while the locking pin 50 is held in the locking recess 54, the locking recess 54 is disengaged from the locking pin 50, and the fast-forward operation lever 47 is returned to its original position by a spring 48.

Next, the operation of this tape recorder will be explained.
First, in the stopped state, the mounting plate 29 is held at a position moved to the right in the figure by a mechanism not shown. Therefore, when a tape cassette (not shown) is set on both reel shafts 2A, 2B and a playback or recording operation is performed, the motor 14 rotates in either direction (for example, counterclockwise as shown in FIG. 1) and , the head mounting plate 29 moves to the left in the figure, the magnetic head 30 comes into contact with the magnetic tape in the cassette, and one pinch roller 17A comes into pressure contact with the capstan shaft 3A. The rotation of the motor 14 drives the capstan shafts 3A, 3B and the drive rotating body 5, and furthermore, one of the reel shafts 2A is rotationally driven via the intermediate gear 10, so that the magnetic tape in the cassette is regulated by the capstan shaft 3A. The recording medium travels at a certain speed and is wound onto one of the take-up reels set on the reel shaft 2A, during which a predetermined playback or recording operation is performed.

When the tape in the cassette is drawn out to its end in this manner, the end of the tape is detected by special means, and the direction of rotation of the motor 14 is thereby switched. Note that the means for detecting the end of the tape and switching the rotation direction of the motor include a mechanical method that detects a sudden change in tape tension and operates a reversal switch of the motor, and a method that detects a sudden change in tape tension and operates a reversing switch of the motor. Various methods are possible, such as an electric method that detects the current and reverses the motor, but this point will not be discussed in detail.

When the rotational direction of the motor 14 is switched, the rotational directions of the transmission gear 11, the driving rotary body 5, and the capstan shafts 3A, 3B are also changed accordingly, and the rotating member 9 is rotated with the driving rotary body 5 as shown in FIG. It rotates in the same direction (clockwise) to separate the intermediate gear 10 from the one operating gear 4A. Further, the engaging member 43 is driven counterclockwise by the rotational force of the rotating member 9. Note that the rotational force of the rotational member 9 in this case is extremely small, but since no particular load is initially applied to the engagement member 43, even the small rotational force of the rotational member 9 is sufficient to rotate the engagement member 43. It can be moved. As shown in FIG. 2, when the rotating end of the engaging member 43 comes to be positioned on the rotating orbit of the pin 8 provided on the large gear 6, the pin 8 is moved by the strong rotational force of the driving rotor 5. The engaging member 43 is now strongly rotated counterclockwise, and the engaging member 43
presses one engagement pin 40A of the transmission member 35 to move the transmission member 35 in the direction of the arrow in FIG.
The rack 38 of the member 35 is brought into mesh with the small gear 7. Thereafter, the engaging member 43 is removed from the rotational orbit of the pin 8, but the transmitting member 35 is further moved in the same direction due to the engagement between the small gear 7 and the rack 38, and the operating pin 41 moves the engaging portion of the rotating lever 23. 25 to rotate the lever 23 clockwise, and the lever 23 is stably held in the uppermost position shown in FIG. 4 by the toggle spring 42. Further, the intermediate gear 10 meshes with the other operating gear 4B to transmit the rotational force of the drive rotary body 5 to the reel shaft 2B. On the other hand, the rotational force of the rotation lever 23 is transmitted to the switching lever 21 via the connection lever 24,
The switch 34 is changed by the movement of the connecting lever 24, and the polarity of the magnetic head 30 is changed, and at the same time, one pinch roller 17A is connected to the capstan shaft 3.
A, and the other pinch roller 17B comes into pressure contact with the capstan shaft 3B via the magnetic tape. Therefore, the magnetic tape in the cassette is driven by the other capstan shaft 3B and travels in the opposite direction, and is sequentially wound onto the reel on the reel shaft 2B side for reproduction or recording. When the magnetic tape is pulled out from the reel on the reel shaft 2A side to the end, the tape running direction is changed in the same way, and operations such as playback and recording continue.

Next, for example, when the motor 14 is rotating counterclockwise as shown in FIG. 1 and an operation such as playback or recording is being performed, the fast forward operation lever 47 is pushed in as shown in FIG. 5 and the locking pin 50 is hooked. 51 locking recess 5
4, the cam pin 49 provided on the lever 47 presses the cam surface 33 of the head mounting plate 29, pushing the head mounting plate 29 back toward the right in the figure against the spring 32. become.
Therefore, the magnetic head 30 attached to the mounting plate 29 is separated from the magnetic tape in the cassette, and at the same time both pinch arms 18A, 18B are also pushed back by the pressing pins 31A, 31B provided on the mounting plate 29, and both pinch rollers 17A are pushed back. , 17B from each capstan shaft 3A, 3B. As a result, the magnetic tape is no longer restricted by the capstan shaft 3A, so
The rotation of the reel shaft 2A allows for high speed winding.

When all of the magnetic tape is wound onto one reel in this manner, the direction of rotation of the motor 14 is switched as before, and the rotating member 9 is rotated. Then, the intermediate gear 10 is separated from one operating gear 4A and meshed with the other operating gear 4B, and at the same time, the rotational force of the driving rotary body 5 is transmitted to the transmission member 35 via the engagement member 43. , and further operates the pinch roller switching mechanism 28 via the transmission member 35. At this time, the protruding piece 39 of the transmission member 35 slides into contact with the release cam 58 of the hook 51 and bends the hook 51 upward.
The locking pin 50 is disengaged from the hook 51, and the fast-forward operating lever 47 is returned to its initial position by the spring 48. Therefore, the head mounting plate 29 also has spring 3.
2 returns to the initial position and brings the magnetic head 30 into contact with the magnetic tape, and the pinch roller 1
7B is brought into pressure contact with the capstan shaft 3B, the shape shown in Fig. 4 is reproduced, and the magnetic tape runs at a speed regulated by the capstan shaft 3B, and performs operations such as playback or recording while being wound onto the reel on the reel shaft 2B side. will be carried out.

The auto-reverse device according to the above embodiment switches the rotational direction of the drive rotary body 5 in accordance with the switching of the rotational direction of the motor 14, and also rotates the rotating member 9, and uses a small rotational force of the rotating member 9. First, the engaging member 43 is moved to a position where it engages with the engaging pin 8 provided on the driving rotary body 5, and while the engaging member 43 is displaced by a certain amount under the rotational force of the driving rotary body 5, this The transmission member 35 is moved in conjunction with the engagement member 43 to a position where it engages with the driving rotary body 5, and the transmission member 35 is strongly driven by the rotational force of the driving rotary body 5, and furthermore, the transmission member 35 is used to move the pinch roller. By operating the switching mechanism 28, the pinch rollers 17A, 1
Since the pinch rollers 17A and 17B are configured to move toward and away from the capstan shafts 3A and 3B, the pinch rollers 17A and 17B can be switched using the rotational force of the motor 14 that drives the capstan shafts 3A and 3B. , the configuration can be simplified. Furthermore, since an electromagnetic plunger is not required as in the conventional case, power consumption can be reduced and the entire tape recorder can be made smaller.

Next, the embodiment shown in FIGS. 7 and 8 will be described. This is an example in which an arc-shaped tooth portion 60 that meshes with the large gear 6 of the drive rotor 5 is provided at the rotating end of the engagement member 59, and the engagement pin 8 of the large gear 6 is omitted (different from the above embodiment). (Identical parts are given the same reference numerals).

Even with such a configuration, the engaging member 59 is first rotated by the rotational force of the rotating member 9 to a position where it meshes with the large gear 6 as shown in FIG. 7, and then the rotation of the large gear 6 is Since the engaging member 59 can be strongly rotated by force and the transmitting member 35 can be moved in the direction of the arrow through the engaging member 59 to the position where it meshes with the small gear 7 as shown in FIG. You can get the same effect as .

Moreover, FIG. 9 shows yet another embodiment,
This achieves the same effects as the embodiments shown in FIGS. 1 to 6 by using a rotating transmission member 61.

In each of the above embodiments, driving the intermediate rotating body, driving the engaging member, and switching the pinch roller switching mechanism via the transmission member are all performed by a common driving rotating body. However, if there are a plurality of rotary drive bodies rotationally driven by a motor, the above-mentioned work may be performed by separate drive rotary bodies. Therefore, the following five aspects can be considered for the auto-reverse device of the present invention.

(mode) ~ is performed by a common driving rotating body.

(Mode) , and are performed by separate drive rotating bodies.

(Mode) , and are performed by separate drive rotating bodies.

(Embodiment) and are performed by separate drive rotating bodies.

(Mode) , , are performed by separate drive rotating bodies.

Here, each of the above embodiments corresponds to "aspects". Therefore, an embodiment corresponding to another aspect will be shown from FIG. 10 onwards.

FIG. 10 embodies the "aspect", and the engagement member 62 is driven by an intermediate rotating body (intermediate gear 10).
However, it is another drive rotor (transmission gear 11 as a second drive rotor) that switches the pinch roller switching mechanism, and the rotational force of this transmission gear 11 causes the pinch roller switching mechanism to switch. The pinch roller switching mechanism is operated via a transmission member 63. In other words, Figure 10 shows the first
The driving rotary body 5 rotates counterclockwise, and the rotating member 64 is urged in the same direction to mesh the intermediate gear 10 with one of the operating gears 4A, thereby transferring the rotational force of the first driving rotary body 5 to one side. This shows the state in which the signal is being transmitted to the reel shaft 2A. In this state, the pinch roller on the same side as the reel shaft 2A presses against the capstan shaft to perform a predetermined playback or recording operation.
When the tape is pulled out to the end and the rotational direction of the motor is switched, the rotational direction of the first drive rotary body 5 and the transmission gear 11 as a second drive rotary body that meshes with the first drive rotary body 5 is switched. Therefore, the rotating member 64 also rotates in the same direction as the first drive rotating body 5, and the intermediate gear 1
0 is brought into mesh with the other operating gear 4A, but the engaging member 62 of the rotating member 64 is engaged with the pin 64A.
Since they are connected by fitting with the long hole 62A,
As the rotating member 64 rotates clockwise, the engaging member 62 slightly rotates around the shaft 62B, so that one end of the engaging member 62 is positioned on the rotation orbit of the engaging pin 8 on the drive rotor 5. become. Therefore, the engagement pin 8 comes into contact with one end of the engagement member 62, and the engagement member 6
2 is strongly rotated by the rotational force of the driving rotary body 5, and presses the engagement pin 63A on the transmission member 63 with the other end to move the transmission member 63 downward in the figure, so that one side of the transmission member 63 is moved. Rack 63B provided in
is meshed with the transmission gear 11, which is the second drive rotating body. Here, the transmission member 63 is driven further downward in the figure by the transmission gear 11, but since the transmission member 63 is connected to the pinch roller switching mechanism as in the previous embodiment, The pinch roller switching mechanism operates in conjunction with the downward movement of the transmission member 63, and simultaneously pulls one pinch roller away from the capstan shaft and presses the other pinch roller against the capstan shaft to switch the running direction of the tape. This is what happens.

FIG. 11 also embodies the "aspect", and the engagement member 65 is driven by the drive rotor (first drive rotor) 5 that drives the intermediate rotor (intermediate gear 10), but in a pinch. The roller switching mechanism 66 is switched by another driving rotating body (a small gear 67 as a third driving rotating body) attached to one of the capstan shafts 3A, and the rotational force of this small gear 67 (i.e., a flywheel) is used to switch the roller switching mechanism 66. The pinch roller switching mechanism 66 is transmitted via the transmission member 68 by the rotational force of the wheel 13A.
It is designed to operate. That is, in FIG. 11, the first driving rotary body 5 rotates counterclockwise, and the rotating member 69 is urged in the same direction, causing the intermediate gear 10 to mesh with one of the operating gears 4A.
This shows a state in which the rotational force of the drive rotary body 5 is being transmitted to one reel shaft 2A. In this state, the pinch roller 17A on the same side as the reel shaft 2A presses against the capstan shaft 3A to perform a predetermined playback or recording operation, but the tape is pulled out to the end and the rotation direction of the motor is switched. Then, the rotational directions of the small gear 67 as the first driving rotary body 5 and the third driving rotary body are also switched. Therefore, the rotating member 6
The rotating member 69 also includes an engaging member 65 that rotates in the same direction as the first driving rotary body 5 to mesh the intermediate gear 10 with the other operating gear 4B.
are connected by fitting the pin 69A and the elongated hole 65A, so as the rotating member 69 rotates clockwise, the engaging member 65 rotates slightly around the shaft 65A, and one end of the engaging member 65 rotates slightly around the shaft 65A. It is positioned on the rotational orbit of the engagement pin 8 provided on the first drive rotary body 5. Therefore, the engagement pin 8 comes into contact with one end of the engagement member 65, and the engagement member 65 is strongly rotated by the rotational force of the drive rotating body 5, and the other end touches the engagement pin 68A on the transmission member 68. The transmission member 68 is moved upward in the figure by pressing, and the rack 68B provided on one side of the transmission member 68 is meshed with the small gear 67. Here, the transmission member 68 is driven further upward in the figure by the small gear 67. At this time, the pinch roller switching mechanism (switching lever) 66 is pressed with the protrusion 68C provided at one end, and the shaft 68 is pressed.
6A, one pinch roller 1
At the same time as the pinch roller 7A is pulled away from the capstan shaft 3A, the other pinch roller 17B is brought into pressure contact with the capstan shaft 3B.

As explained above based on various embodiments, the auto reverse device of the present invention has a
Alternatively, a plurality of drive rotors are driven, and a rotating member provided coaxially with any one of the drive rotors engages the intermediate rotor with one of the actuating rotors to reel one of the reels. The rotational force of the driving rotary body is transmitted to the shaft, and when the rotational force of the motor is switched and the intermediate rotary body is separated from one working rotary body and engaged with the other working rotary body,
At this time, due to the slight rotational force of the rotating member, the engaging member first comes to engage with one of the driving rotating bodies, and the engaging member receives the rotational force of the driving rotating body by a certain amount. During the displacement, the transmission member interlocked with this is configured to engage one of the drive rotating bodies and operate the pinch roller switching mechanism with the rotational force of the rotating body, so that the pinch roller switching mechanism is operated by the rotational force of the rotating body. The switching operation of each roller toward and away from the corresponding capstan shaft can be performed by simple mechanical means, and the structure can be simplified and downsized.

Note that the present invention can be implemented with various modifications other than the above-mentioned embodiments. For example, the first driving rotary body 5 can be composed of a single gear, or all gear parts can be replaced with rotating bodies such as friction pulleys. Further, by connecting the first driving rotor and the rotating member via a friction transmission mechanism, an effect can be obtained in which the rotational force of the rotating member can be strengthened.

[Brief explanation of the drawing]

1 to 6 show one embodiment of the present invention, in which FIG. 1 is a plan view, FIGS. 2 to 5 are plan views showing only the parts necessary for explaining the operation, and FIG. 6 is a partial perspective view. 7 and 8 are partial plan views showing another embodiment, and FIGS. 9 to 11 are partial plan views showing still further embodiments. 2A, 2B... Reel shaft, 3A, 3B... Capstan shaft, 4A, 4B... Operating gear (operating rotating body),
5... (first) driving rotating body, 9, 64, 69... Rotating member, 10... Intermediate gear (intermediate rotating body), 11...
Transmission gear (second drive rotating body), 14...motor,
17A, 17B...Pinch roller, 28, 66...Pinch roller switching mechanism, 30...Magnetic head, 35,
61, 63, 68...transmission member, 43, 59, 6
2, 65...Engagement member, 60... Small gear (third drive rotating body).

Claims (1)

[Scope of Claims] 1. An operating rotary body provided to rotate integrally with a pair of reel shafts, a pair of capstan shafts and a pinch roller each disposed on both sides of a magnetic head, and a pair of capstan shafts and a pinch roller disposed on both sides of a magnetic head. a motor that is rotationally driven and capable of forward and reverse rotation; a pinch roller switching mechanism that selectively presses the pinch rollers against their respective corresponding capstan shafts; and two drive rotating bodies that are rotationally driven by the motor; The intermediate rotating body engages with the driving rotating body and selectively engages each of the operating rotating bodies to transmit the rotational force of the driving rotating body to the operating rotating body. The intermediate rotating body is supported coaxially with one of the driving rotating bodies, is biased in the same direction as the rotational direction of the driving rotating body, and is rotated by switching the rotational direction of the motor, thereby driving the intermediate rotating body. A rotating member that is separated from one operating rotating body and engaged with the other operating rotating body, and a rotating member that engages with the one driving rotating body and receives the rotational force of the driving rotating body by rotation of this rotating member. and a transmission member that engages the other driving rotating body by displacement of the engaging member and receives the rotational force of the driving rotating body to switch the pinch roller switching mechanism. Auto-reverse device for 2-reel tape recorder. 2. The auto-reverse device for a two-reel tape recorder according to claim 1, wherein the operating rotary body, the two drive rotary bodies, and the intermediate rotary body are all gears.