JPS62295246A - Magnetic tape driving device for reciprocating type cassette tape recorder - Google Patents

Abstract

PURPOSE:To eliminate a switching means such as a plunger and to simplify a constitution, and to miniaturize a reciprocating type cassette tape recorder to an extra-small size by executing switching operation of a first reel shaft and a second reel shaftly utilizing the rotational force of a motor. CONSTITUTION:The shifting action of a control plate and the holding action in each operating position are executed by utilizing the fitting force generated between a controlling gear and a first driving gear 5 or a second driving gear. The control gear to which the rotation of a motor is transmitted by engagement with the first driving gear 4 driven by the first motor 2 or a second driving gear 11 driven by the second motor 4 and a transmission gear that transmits rotation of the controlling gear to a first reel shaft 17 or a second reel shaft 21 are attached rotatably. Since the fitting force generated between the first driving gear or the second driving gear is utilized, the constitution is simplified, and effective for the miniaturization of a tape recorder.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention provides a reproduction function in a first direction and a reproduction function in a second direction opposite to the first direction. The present invention relates to a reciprocating cassette tape recorder, and particularly to a magnetic tape drive device.

(b) Conventional technology An audio device called a headphone stereo, which listens to the playback sound of a magnetic tape using a headphone, is widespread, but the cassette-type tape recorder built into such an audio device has a long playback operation. A reciprocating type tape recorder is generally used which has not only a playback function in a first direction so that the playback function is performed, but also a playback function in a second direction opposite to the first direction. Such a reciprocating cassette tape recorder includes a first capstan shaft that drives the magnetic tape at a constant speed in a first direction and a second capstan shaft that drives the magnetic tape at a constant speed in a second direction. The capstan shaft is driven to rotate in opposite directions depending on the operating state in each direction. In addition, the reciprocating cassette tape recorder has a first reel shaft that winds the magnetic tape in the first direction during playback operation in the first direction, and a second reel shaft that winds the magnetic tape in the second direction during playback operation in the second direction. It has 2 reel axes.

There are two methods for rotationally driving the first capstan shaft, the second capstan shaft, the first reel shaft, and the second reel shaft: a method in which they are driven by one electric motor, and a method in which they are driven by two electric motors. , as a technology for driving by two electric motors, for example, Japanese Patent Publication No. 59-279
There is something that has been fully disclosed in Publication No. 81.

(c) Problems to be Solved by the Invention The above-mentioned publication states that the first and second electric motors
A technology has been disclosed that directly drives the capstan shaft and the second capstan shaft, and also drives the first reel shaft and the second reel shaft, and such technology requires a belt or the like to transmit the rotation of the electric motor to the capstan shaft. This has the advantage of simplifying the configuration. Therefore, such technology is effective in downsizing a reciprocating cassette tape recorder incorporated in a headphone stereo. However, since the switching mechanism that selectively transmits the rotation of the electric motor to the first reel shaft and the second reel shaft uses the suction force of the plunger, it is not possible to implement it in a reciprocating cassette tape recorder that uses a battery as the T source. In some cases, there is a problem in that there are restrictions on the driving current of the plunger and the mounting position of the plunger. The present invention aims to provide a magnetic tape drive device that is improved in this respect.

(d) Means for Solving the Problems In the magnetic tape drive device of the present invention, when in a state of playback operation in the first direction, the first pinch roller is pressed into contact with the magnetic tape and the magnetic tape is moved at a constant speed in the first direction. a first capstan shaft for driving the magnetic tape; a second capstan shaft for driving the magnetic tape at a constant speed in the second direction; When in a state of regeneration operation, the capstan rotates in a first direction to rotationally drive the first capstan shaft, and when in a state of regeneration operation in a second direction, rotates in a second direction opposite to the first direction. a first electric motor that rotates in a first direction that is the same direction as the first electric motor when in a regeneration operation state in a first direction, and opposite to the first direction when in a regeneration operation state in a second direction; a second electric motor that rotates in a second direction and rotationally drives the second capstan shaft; a first drive gear that is rotationally driven in a second direction opposite to the first direction by the reversing operation of the first electric motor when in a regeneration operation state in two directions; and a regeneration operation state in the first direction. When the second electric motor is in a state of rotation in a first direction, and when the second electric motor is in a regeneration operation state, the second electric motor rotates in a second direction opposite to the first direction. a second drive gear that is driven; a first reel shaft that is rotationally driven at a playback end in a first direction and winds the magnetic tape in the first direction; and a first reel shaft that is rotationally driven at a playback end in a second direction. a second reel shaft that winds the magnetic tape in a second direction; and a control plate that is in a first position when the magnetic tape is in the first direction and in a second position when the magnetic tape is in the second direction. and is rotatably attached to the control plate and meshes with the second drive gear when the control plate is in the first position, and meshes with the first drive gear when the control plate is in the second position. an intermeshing control gear rotatably mounted on the control plate for rotation with the control gear and transmitting rotation of the control gear to the first reel shaft when the control plate is in a first position; , and a transmission gear that transmits rotation of the control gear to the second reel shaft when the control plate is in the second position.

(E) Function The present invention provides a control gear to which the rotation of the T-motor is transmitted through meshing with a first drive gear rotationally driven by a first electric motor or a second drive gear rotationally driven by a second electric motor, and A transmission gear that transmits the rotation of the gear to the first reel shaft or the second reel shaft is rotatably attached to the control plate, and the displacement operation and the holding force at each operating position are controlled by the control gear and the first driving gear or the control plate. This is done by utilizing the biting force generated between the second drive gear and the second drive gear.

(F) The embodiment drawings are all related to the present invention; Fig. 1 is a plan view showing a stopped state, Fig. 2 is a plan view showing a reproducing state in the second direction, and Fig. 3 is a plan view showing the reproducing state in the second direction. It is a top view showing a state. In the figure, (1) is the first capstan shaft that drives the magnetic tape at a constant speed in the first direction when it is in the state of playback operation in the first direction, and (2) is the first capstan shaft that directly drives the first capstan shaft (1). 1'N, which is provided to drive, is a motive;
It rotates clockwise when it is in the reproducing operation state in the direction, and rotates counterclockwise when it is in the reproducing operation state in the second direction. (3) is a second capstan shaft that drives the magnetic tape at a constant speed in the second direction when the reproduction operation is in the second direction; (4) is a second capstan shaft that directly drives the second capstan shaft (3); A second electric motor is provided to rotate clockwise when in the regeneration operation state in the first direction and counterclockwise when in the regeneration operation state in the second direction. . (5) is a first drive gear attached to rotate integrally with the first capstan gear (1); (6) is attached to be rotatable by the shaft (7) and the first drive gear; The first intermediate gear (
8) is a first drive gear which is rotatably mounted by the shaft (9) and is always in mesh with the first intermediate gear (6); <10) together with the first drive gear <8); a first switching drive gear mounted to rotate;
11) is a second drive gear mounted to rotate integrally with the second capstan shaft (3); (12) is a second drive gear mounted rotatably by a shaft (13); A second intermediate gear (14), which is always in mesh with the gear (11), is rotatably attached to the shaft (15) and is always in mesh with the second intermediate gear (12). The second drive gear (16) is a second switching drive tooth it mounted to rotate together with the second drive gear (14). (17) is a first reel shaft which is rotationally driven at the end of the playback operation in the first direction and winds the magnetic tape in the first direction; (18) is attached to rotate together with the 9JrJ1 reel shaft (17). 1st
The reel gear (19) is rotatably attached to the shaft (20) and is connected to the first reel gear (18).
), the transmission gear for the first reel is always in mesh with (
21) is a second reel shaft which is rotated during the reproduction operation in the second direction and winds the magnetic tape in the second direction;
is a second reel gear mounted to rotate together with the second reel shaft (21), and (23) is rotatably mounted to the second reel gear (22) by the shaft (24>). This is a transmission gear for the second reel that is always in mesh.(25) is a control plate rotatably attached to the shaft (26), and the control plate is rotated between the first position and the third position shown in FIG. It is made movable between the second position shown in the figure. 〈27〉 is a regulation pin which is attached and fixed to the fixed board, and the first one formed on the control plate (25) The control plate (25) has the function of positioning the control plate (25) at the first position and the second position by contacting the control plate (28) and the second control plate (29). (25) is a control gear rotatably attached to the shaft (31), and is always connected to the first drive gear (8).
and the second drive gear (14), each gear being meshed with at least one of the gears. (32)
is a first transmission gear which is rotatably attached to the control plate (25) by a shaft (33) and is always in mesh with the control gear (30); (34) is the first transmission gear ( 32), which is attached to rotate integrally with the control plate (25) and meshes with the first reel transmission gear (19) when the control plate (25) is in the first position; (25) is in the second position so as to mesh with the second reel transmission gear (23), and the first
Reel transmission gear <19) and second reel transmission gear (
Each gear is always in mesh with at least one gear in 23). (35) is a trigger member which is rotatably mounted on a shaft (36) and is provided with a trigger pin (37), which moves the control plate (25) from the first position to the second position. The control plate (25) is related in such a manner that the control plate (25) is caused to be displaced from the first position to the second position by the displacement thereof, and is also caused to be displaced from the second position to the first position by the displacement of the control plate (25) from the second position to the first position. . (38) is a switching gear rotatably mounted on the shaft (39), and the first tooth portion (40) meshes with the first switching drive gear (10) during switching operation in the reproduction direction.
), the second switching drive gear (1
6), which is in a position facing the first switching drive gear (10) when in the regeneration operation state in the first direction, and is in the regeneration operation state in the second direction. The first toothless portion (42) is located at a position facing the second switching drive gear (16) at one time, and the first toothless part (42) is located at a position facing the second switching drive gear (16) when in a state of regeneration operation in the first direction. A second toothless portion (43) is formed at a position opposite to the first switching drive gear (10) when in the regeneration operation state in the second direction. (44) is a first trigger protrusion formed on the switching gear (38), which extends from the first position to the second position of the trigger member (35).
When displaced to the position, the switching gear (35) is pressed by the trigger pin (37) formed on the trigger member (35)
38) slightly clockwise. (45) is a second trigger protrusion formed on the switching gear (38), and the trigger member (3
5) When the trigger member (35) is displaced from the second position to the first position, it is pressed by the trigger pin (37) formed in the trigger member (35), and the switching gear (38) is slightly rotated counterclockwise. It has an effect. (46) is a control cam formed on the switching gear (38), and is the tenth control cam.
The hook portion (47) and the 20th hook portion (48) are completely formed, and the switching roller (49) is attached.

(50) is a locking member which is rotatably mounted on the shaft (51) and biased clockwise by a spring (52), and is formed on the control cam (46) of the switching gear (38). The broken 10th part (47)
and the 20th hook portion (48) to engage with the switching gear (38).
A lock pin (53) is provided for locking and holding the holder in the position shown in FIGS. 2 and 3. (54) is the reason (5
5) and is biased counterclockwise by a spring (not shown); A first pinch roller (56) is rotatably attached to the first capstan shaft (1) and drives the magnetic tape at a constant speed in a first direction. The first control pin (57) that controls the pressing operation to the capstan shaft 1)
is provided. (58) is a second pinch roller arm that is rotatably mounted on a shaft (59) and biased clockwise by a spring (not shown), and is in a state of regeneration operation in the second direction. when the magnetic tape is in pressure contact with the second capstan shaft (3).
A second pinch roller (60) is rotatably mounted to drive the second pinch roller (60) at a constant speed in the direction, and a second pinch roller (60) that controls the IE pressing operation of the second pinch roller (60) to the second capstan shaft (3) A control bin (61) is provided. (62) works with the guide pins (63) (64) and guide holes (65) (66) to make arrows (A') and (B)
The first
Pinch roller (56) and second pinch roller (60
) is a regeneration direction switching lever that controls the pressure contact operation between the first capstan shaft (1) and the second capstan shaft (3), and the first capstan shaft (54) provided on the first pinch roller arm (54). A first control hole (67) and the second pinch roller arm (67) that control the pressing operation of the first pinch roller (56) to the first capstan shaft (1) in cooperation with the control pin (57). The second pinch roller (60) cooperates with the second control bin (61) provided at the
) is formed with a second control hole (68) for controlling the press-contact operation with the second capstan shaft (3). (69) is a first pressing portion formed on the regeneration direction switching lever (62), which is formed on the switching gear (38) when the switching gear (38) is rotated counterclockwise. The regeneration direction switching lever (62) receives the pressing force of the switching roller (49).
) in the direction of arrow (A), which is the first position, and also holds the reproduction direction switching lever (62) at the first position. (70) is a second pressing portion formed on the reproduction direction switching lever (62), and when the switching gear (38) is rotated clockwise, the switching gear (
38), the reproducing direction switching lever (62) is displaced in the direction of arrow (B), which is the second position, and the reproducing direction switching lever (62) is moved. It has the function of holding the second position. In such a configuration, the first pinch roller arm (54) and the second pinch roller arm (58) are connected to a slide substrate (not shown) on which a magnetic head is mounted and which is displaced to an operating position during a reproduction operation. ), when the displacement movement to the operating position is fully restricted and the device is in a stopped state, the non-operating position shown in FIG. Hole (6
8), the pressure welding operation is in a position where it cannot be controlled. Further, the first control hole (67) allows the first pinch roller (56> to press into contact with the first gear shaft (1) when the regeneration direction switching lever (62) is in the first position, and also allows the first pinch roller (56) to press into contact with the first gear shaft (1). The second control hole (68) is formed to prevent the first pinch roller (56) from pressing against the first capstan shaft (1) when the first pinch roller (56) is in the position. 62) is in the first position, it prevents the second pinch roller (60) from pressing against the second capstan shaft (3), and
It is formed to allow the second pinch roller (60) to press into contact with the second pinch roller (3) when in position. In such a configuration, during the regeneration operation in the first direction, the first electric motor 2) and the second electric motor (4) are both rotationally driven in the clockwise direction, and during the regeneration operation in the second direction, the first electric motor (2) and the second electric power machine (4) are both rotated counterclockwise. Further, the rotating direction of the first electric motor (2) and the second electric motor (4) is configured to be switched by a reproducing direction switching operation accompanying the detection of the end of the magnetic tape or a reproducing direction switching operation manually. The magnetic tape drive device of the present invention is constructed as described above, and its operation will be explained next.6 The state shown in FIG. Arm (54
) and the second pinch roller arm (58) are in the non-operative position shown. In addition, in the stopped state shown in FIG. 1, the control plate (25) and the reproduction direction switching lever (62) are
It is in the position where playback operations are performed in the direction. When a regeneration operation is performed in the first direction in such a stopped state, the slide board is displaced to the operating position, and drive current is supplied to the first electric motor (2) and the second electric motor (4). The electric motor (2) and the second electric motor (4) rotate clockwise. When the first electric motor (2) rotates clockwise, the first capstan shaft (1), which is the central axis of rotation thereof, is driven to rotate clockwise, so that the first capstan shaft (1) is integrated with the first capstan shaft (1). The first driving gear (5) provided to rotate in the clockwise direction is also rotated clockwise.When the first driving gear (5) rotates in the clockwise direction, the rotation is caused by the rotation of the first intermediate gear (6). is transmitted to the first drive gear (8) through When the second electric motor (4) rotates clockwise, the second capstan shaft (3), which is the central axis of rotation thereof, is driven to rotate clockwise. The second driving gear (11), which is provided to rotate integrally with (3), also rotates clockwise rA.When the second driving tooth jK (11) rotates clockwise, its rotation is transmitted to the second drive gear (14) via the second intermediate gear (12), so that the second drive gear (14) and the second drive gear (14) are mounted to rotate together with the second drive gear (14). The switching drive gear (16) is rotationally driven clockwise. When the first drive gear (8) and the second drive gear (14) rotate clockwise, the first drive gear (8)
A meshing drive operation is performed with the control gear (30) provided to mesh with the second drive gear (14).
At this time, the meshing relationship between the first drive gear (8) and the control gear (30) is a relief relationship, and the meshing relationship between the second drive gear (14) and the control gear (30) is a bite relationship. Therefore, the control gear (30) is separated from the first drive gear (8), and the second drive gear (14) and the control gear (30) are firmly meshed with each other, and their biting force causes the control plate (25) to move away from the control gear (30).
) is biased counterclockwise around the axis 26). Therefore, the control plate (25) is displaced and held in the first position shown in FIG. It becomes in mesh with the gear (19). Therefore, the rotation of the second drive gear (14) is controlled by the control gear (30),
First transmission gear (32), second transmission gear (34), first reel transmission gear (19), and first reel gear (18)
The first reel shaft (17) is transmitted to the first reel shaft (17) via the first reel shaft (17), and the first reel shaft (17) is rotationally driven in the clockwise direction. Furthermore, when the slide board is displaced to the operating position, the first pinch roller arm (54) and the second pinch roller arm (58) are each rotated to the operating position by the biasing force of the spring, but the playback direction switching lever (62) ) is in the first position, the first control hole (67) and second control hole (68) formed in the reproduction direction switching lever (62) act to
Pinch D-Lar (56) 1st key - Buskun shaft 1)
Effl movement to the second pinch roller (6
0) is prevented from pressing against the second capstan shaft (3), so only the first pinch roller (56) is pressed against the first capstan shaft (1). When the regeneration operation in the 17th direction is performed in this way, the first capstan shaft (1) is rotationally driven by the first electric motor (2) and the first pinch roller is pressed against the first capstan shaft (1). - (56) performs a constant speed driving operation of the magnetic tape in the first direction, and the second electric motor (4) rotationally drives the first reel shaft (17) to wind up the moisture tape. As a result, the reproducing operation state of the tape recorder in the first direction is established. When the magnetic tape is in the state of playback operation in the first direction, the magnetic tape is moved to the first capstan shaft (1).
Since it is driven at a constant speed in the first direction by the cooperation of the first reel shaft (56) and the first pinch roller (56), it is necessary to gradually slow down the rotational speed of the first reel shaft (17) for winding the magnetic tape. This operation is performed by varying the rotational speed of the second electric motor (4).

As described above, the reproducing operation in the 1″y5 direction is performed, but
Next, the reproduction operation in the second direction will be explained. When the magnetic tape runs to the end during the playback operation in the first direction described above, the end detection device causes the rotation direction of the first motor (2) and the second motor (4) to reverse and counterclockwise. rotationally driven in the direction. Said first electric motor (2)
When the first capstan shaft 1) and the first drive gear (5) rotate counterclockwise, the first capstan shaft 1) and the first drive gear (5) are driven to rotate in the counterclockwise direction, and the rotation is transmitted via the first intermediate gear (6). The first drive gear (8) is rotationally driven in a counterclockwise direction.

Further, when the second electric motor (4) rotates counterclockwise, the second rotation shaft (3) and the second driving gear (11>) are rotationally driven in the counterclockwise direction, and the rotation is caused by the rotation of the second intermediate gear. (12) Second drive gear (14) transmitted through
is rotated counterclockwise. The first drive gear (8
) and the second drive gear (14) rotate counterclockwise, the first drive gear (8>) and the second drive gear (14>) engage with the control gear (30), which is provided to mesh with the first drive gear (8>) and the second drive gear (14>). The operation is performed, but at this time, the meshing relationship between the first drive gear (8) and the control gear (30) is a biting relationship, and the second
The meshing relationship between the drive gear (14) and the control gear (30) is a meshing relationship. Therefore, the control plate (25) that was in the first position shown in FIG. The relief force generated by the gear (30) causes rotational displacement in the clockwise direction about the shaft (26), and the first
Due to the biting force caused by the meshing action between the drive gear (8) and the control gear (30), the gear is further rotated clockwise and maintained at the second position shown in FIG. When the control plate (25) is in the second position, the control gear (30) is spaced apart from the second drive gear (14) and meshes with the first drive gear (8). In this way, the first electric motor (
2) and when the second electric motor (4) is reversely operated, the control plate (25) is rotationally displaced from the first position shown in FIG. 2 to the second position shown in FIG. When a displacement operation is performed, a trigger member (35) is activated in conjunction with the displacement operation.
is rotated about the shaft (36) from the first position tt to a second position counterclockwise. When the trigger member (35) is rotated counterclockwise, the trigger pin (37) provided on the trigger member (35) moves to the first trigger protrusion (37) formed on the switching gear (38).
44) and presses the first trigger protrusion (44), the switching gear (38) is rotated by a rotational force that overcomes the holding force of the lock pin (53) provided on the lock member (50). Rotate slightly clockwise. When the switching pawl 38) rotates clockwise, the first tooth section (40) and the second tooth section (41) formed on the switching gear (38) are each rotated counterclockwise. The first switching drive gear (10) and the second switching drive gear (
16).

As a result, the switching gear (38) is rotated clockwise by the rotational driving force of the first switching drive gear (10) and the second switching drive gear (16), but the switching gear (38) is rotated in a clockwise direction. A position where the first toothless portion (42) and the second toothless portion (43) formed in (38) face the second switching drive gear (16) and the first switching drive gear (10), respectively. When it rotates to this point, the mesh with each gear is released and it is no longer driven to rotate. FIG. 3 shows a state in which the switching gear (38) is rotationally driven by the above-described operation, and the switching gear (38) is mounted on a control cam (46) formed on the switching gear (38). The second
The locking portion (48) is held in the position shown in FIG. 3 by engagement with a locking pin (53) provided on the locking member (50). Further, when the switching gear (38) rotates from the position shown in FIG. 2 to the position shown in FIG. 3, the control cam (46) rotates clockwise together with the switching gear (38). The switching roller (49) attached to the cam (46) is connected to the playback direction switching lever (6).
2), the reproduction direction switching lever (62) is displaced in the direction of arrow (B), which is the second position, and is moved to the second position. Retained. The reproduction direction switching bar (62)
When the playback direction switching lever (62) is moved to the position, the first pinch roller rack 56) is separated from the first capstan shaft (1) by the action of the first control hole (67) formed in the playback direction switching lever (62), and the second pinch roller The control hole (68) causes the second pinch roller (60) to move toward the second capstan shaft (
3) will be in a state of pressure contact. Therefore, in this state, the second capstan shaft (3) is rotated counterclockwise by the second electric motor (4) and the second pinch roller (3) is pressed against the second capstan shaft (3). 60), the magnetic tape is driven at a constant speed in the second direction. Further, when the control plate (25) is rotationally displaced to the second position, the control gear (30) meshes with the first drive gear (8) and the second drive gear (8).
The transmission gear (34) is brought into mesh with the second reel transmission gear (23). Therefore, the rotation of the first electric motor (2) is caused by the rotation of the first driving gear (5), the first intermediate gear (6), the first
Drive gear (8), control gear (30), first transmission gear (3
2), second transmission gear (34), second reel transmission gear (
23) and the second reel gear (22) to the second reel shaft (21), and the second reel shaft (21) is rotationally driven in the counterclockwise direction. In this way, the second reel axis (
21) and the second capstan shaft (3)
As a result of the constant speed driving operation by the second pinch roller (60), the tape recorder is in a reproducing operation state in the second direction. Then, a second reel shaft (2
Although it is necessary to gradually slow down the rotational speed of the first electric motor (2), this operation is performed by varying the rotational speed of the first electric motor (2). It goes without saying that the switching operation corresponding to the reproducing direction of the magnetic head, etc. is performed by the displacement operation of the reproducing direction switching lever (62).

As described above, the reproduction direction is switched from the first direction to the second direction. Next, the switching operation from the second direction to the first direction will be explained. When the hot tape runs to the end while it is in the reproducing operation state in the second direction shown in the third cause, the rotation direction of the first electric motor (2), the second M, and the motor (4) is changed by the action of the end detection device. They are each rotated clockwise. When the first electric motor (2>) rotates clockwise, the first capstan shaft (1) and the first drive gear (5) are rotated clockwise, and the rotation rotates the first intermediate gear (6). The first drive is transmitted through the first truck (
8) is rotated clockwise. In addition, the second electric f
When R (4) rotates clockwise, the second capstan shaft (
3) and the second driving gear (11) is rotationally driven in the clockwise direction, and the second driving gear (14) whose rotation is transmitted via the second intermediate gear (12) is rotationally driven in the clockwise direction. Ru. The first drive gear (8) and the second drive gear 1
4) rotates clockwise, a meshing drive operation is performed with the control gear (30) provided to mesh with the first drive gear (8) and the second drive gear (14). First drive! The meshing relationship between the 1XII gear (8) and the control gear (30) is a relief relationship, and the second drive gear (14)
The meshing relationship between the control gear (30) and the control gear (30) is a biting relationship. Therefore, the control board (25) was in the second position shown in FIG.
is first rotated counterclockwise about the shaft (26) by the escape force generated by the first drive gear (8) and the control gear (30), and the second drive gear ( 1
4) and the control gear (30) are further rotated counterclockwise due to the biting force caused by the meshing action of the control gear (30).
It will be in a state where it is displaced and held in position. Then, control board (2
5) is in the first position, the control gear (30) is spaced apart from the first drive gear (8) and meshed with the second drive gear (14), as described above. When the first electric motor (2) and the second electric motor (4) are reversely operated in this way, the control plate (25) is rotated from the second position shown in FIG. 3 to the first position shown in FIG. When such a displacement operation is performed, the trigger member (35) is rotated about the shaft (36) to the first position which is clockwise from the second position. When the trigger member (35) is rotated clockwise, the trigger pin (37) provided on the trigger member (35)
) comes into contact with the second trigger protrusion (45) formed on the switching gear (38), and the second trigger protrusion (45)
As a result of pressing the switching gear (38), the locking member (5
The rotational force that overcomes the holding force of the lock pin (53) provided at 0) causes it to rotate slightly counterclockwise. When the switching gear (38) rotates counterclockwise, the first tooth portion (4) formed on the switching gear (38) rotates.
0) and the second tooth portion (41) mesh with the first switching drive gear (10) and the second switching drive gear (16), which are rotated clockwise. As a result, the switching gear (38) is rotated counterclockwise by the rotational driving force of the first switching drive gear (10) and the second switching drive gear (16), but the switching gear (38) is rotated counterclockwise until it reaches a predetermined position, that is, the switching gear. Gear (38)
The first missing tooth portion (42) and the second missing tooth portion (
When the gears 43) rotate to positions facing the first switching drive gear (10) and the second switching drive gear (16), the meshing with each gear is released and the gears are no longer rotated.

FIG. 2 shows a state in which the switching gear (38) is rotationally driven by the operation described above, and the switching gear (38)
The control cam (46) is formed incorrectly on the switching gear (38).
) is held in the position shown in FIG. 2 by engagement between the tenth hook portion (47) provided on the lock member (50) and the lock pin (53) provided on the lock member (50). Further, when the switching gear (38) rotates from the position shown in FIG. 3 to the position shown in FIG. 2, the control cam (46) rotates counterclockwise together with the switching gear (38). Switching roller (49) attached to control cam (46)
comes into contact with and presses the first pressing portion (69) formed on the reproduction direction switching lever (62), and as a result, the reproduction direction switching lever (62) is displaced in the direction of arrow (A), which is the first position. and is held in the first position. When the reproduction direction switching lever 2) is displaced to the first position, the first control hole (67) formed in the reproduction direction switching lever (62) is moved to the first position.
), the first pinch roller (56) is brought into pressure contact with the first capstan shaft (1), and the second control hole (68) causes the second pinch roller (60) to come into pressure contact with the first capstan shaft (1).
is spaced apart from the second capstan shaft (3). When such a switching operation is performed, the tape recorder enters a reproduction operation state in the first direction shown in FIG.

In the present invention, the rotation direction of the first electric motor (2) and the second electric motor (4) is reversed by the end detection device that detects the end of the magnetic tape, but the operation provided to switch the playback direction is It is also possible to reverse the direction of rotation by operating a button. Further, the rotational speeds of the second electric motor (4) and the first electric motor (2) are varied in order to perform rotational driving operation of the first reel shaft (17) and the second reel shaft (21) for the reproduction operation. However, the first reel shaft (17) and the second reel shaft (
By incorporating a clutch mechanism into the rotation transmission path to 21), it is also possible to perform the rotational drive operation for regeneration. Further, the rotational driving operation of the switching gear (38) provided to switch the playback direction is controlled by the rotational driving force of the first switching drive gear (10) and the second switching drive gear (16), that is, the first electric motor (2). ) and the second electric motor (4), but the first electric motor (2)
) is sufficiently large, the rotational driving force of the second electric motor @ (4) is unnecessary, and in this case, the rotational driving force of the second electric motor @ (4) is unnecessary. 2
The tooth portion (41) becomes unnecessary. On the contrary, the second
If the rotational driving force of the electric motor (4) is sufficiently large, the rotational driving force of the first electric motor (2) is unnecessary;
The first tooth portion (40) formed on the switching drive gear (10) and the switching gear (38) becomes unnecessary.

(G) Effects of the Invention The magnetic tape drive device of the present invention is rotationally driven in the first direction and the second direction by the rotation operation of the first electric motor in the first direction and the second direction that is the opposite direction to the first direction. and a second drive gear that is rotationally driven in the first direction and the second direction by the rotational movement of the first drive gear or the second electric motor in the first direction and the second direction that is opposite to the first direction. A control gear to which the rotation of the first electric motor or the second electric motor is transmitted through meshing, and a first reel shaft which causes the rotation of the control gear to wind the magnetic tape in the first direction or wind the magnetic tape in the second direction. A transmission gear for transmitting data to a second reel shaft for reeling is rotatably attached to the control plate, and the control plate has a first position where the drive operation is performed in the first direction, and a second position where the drive operation is performed in the 2j5 direction. The displacement operation between and the holding operation at each position are performed using the biting force generated between the control gear and the first drive gear or the second drive gear, that is, the rotational force of the electric motor is used. Since the switching operation between the first reel shaft and the second reel shaft is carried out, there is no need for switching means such as a plunger, and the structure is simple. This has a great effect on miniaturizing tape recorders.

[Brief explanation of the drawing]

The drawings all relate to the magnetic tape drive device of the present invention.
The figure is a plan view showing the stopped state, FIG. 2 is a plan view showing the reproducing state in the first direction, and the third section is a plan view showing the reproducing state in the second direction. Explanation of main drawing numbers (1)...1st capstan shaft, (2)...1st
Electric exciter, (3)...second capstan shaft, (4)...
...Second electric motor, (5)...First drive gear, (
6)...First intermediate gear, (8)...First drive gear, (10)...First switching drive gear, (11>...
...Second drive gear, (12)...Second intermediate gear,
(14)...Second drive gear, (16)...Second drive gear
Switching drive gear, (17)...first reel shaft, (1
8)... Gear for the first reel, (19)... Transmission gear for the first reel, (21)... Second reel shaft, <
22)...Second reel gear, (23>...Second reel gear)
Reel transmission gear, (25)...control board, (30)
...Control gear, (32)...First transmission gear, (
34)...Second transmission gear, (35)...Trigger member, (38)...Switching gear, (54)...First pinch roller arm, (56)...First Pinch roller 1 (58)...second pinch roller arm,
(60)...Second pinch roller-1 (62)...Reproduction direction switching lever.

Claims (1)

[Claims] (1) In a reciprocating cassette tape recorder having a playback function in a first direction and a playback function in a second direction opposite to the first direction, when the reciprocating cassette tape recorder is in the playback operation state in the first direction, the first A first capstan shaft is pressed against a pinch roller and drives the magnetic tape at a constant speed in a first direction; a second capstan shaft that rotates in the first direction when in the regeneration operation state in the first direction and rotationally drives the first capstan shaft and also in the regeneration operation state in the second direction; At one time, the first electric motor rotates in a second direction that is opposite to the first direction, and when the first electric motor is in a regeneration operation state in the first direction, the first electric motor rotates in the first direction that is the same direction as the first electric motor. a second electric motor that rotates in a second direction opposite to the first direction and rotationally drives the second capstan shaft when in the regeneration operation state in the first direction; When the first electric motor rotates in a first direction and is in a regeneration operation state in a second direction, the first electric motor rotates in a second direction opposite to the first direction. a first drive gear;
When in the regeneration operation state in the first direction, the second electric motor rotates in the first direction, and when in the regeneration operation state in the second direction, the rotation is driven in the opposite direction by the reverse operation of the second electric motor. a second drive gear that is rotationally driven in a second direction, a first reel shaft that is rotationally driven during a reproduction operation in the first direction and winds the magnetic tape in the first direction; a second reel shaft which is rotationally driven during a playback operation and winds the magnetic tape in a second direction; and a second reel shaft which is in the first position when in a playback operation state in the first direction and is in a playback operation state in a second direction; a control board in a second position;
rotatably attached to the control plate and meshing with the second drive gear when the control plate is in the first position and meshing with the first drive gear when the control plate is in the second position; a control gear rotatably mounted on the control plate for rotation with the control gear and transmitting rotation of the control gear to the first reel shaft when the control plate is in a first position; When the control plate is in the second position, the second
a transmission gear for transmitting the rotation of the control gear to the reel shaft, and a transmission gear for displacing the control plate from the first position to the second position and holding the control plate at the second position in a second direction of the first driving gear. The operation of displacing the control plate from the second position to the first position and the operation of holding the control plate in the first position are performed by the biting force of the control gear caused by the rotational drive of the second drive gear in the first direction. A magnetic tape drive device for a reciprocating cassette tape recorder, characterized in that the driving force is driven by the biting force of a control gear.