JPH0334630B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a tape recorder, and in particular to a tape recorder equipped with a reversible electric motor that rotates the tape in the opposite direction to that during rewinding, playback, and fast forwarding. It concerns a drive device for a recorder.

(b) Prior art The drive of the reel shaft in a tape recorder is
There are three drive operations: driving the take-up reel shaft for playback operation, driving the take-up reel shaft for fast-forward operation, and driving the supply reel shaft for rewind operation. A drive device that performs such a drive operation generally uses one electric motor or two electric motors. A device in which the reel shaft is driven by a single electric motor has a problem in that when driving the supply reel shaft, the rotation direction must be opposite to the direction in which the take-up reel shaft is driven, resulting in a complicated configuration. are doing.
In addition, in a device that uses two electric motors to drive the reel shaft, one electric motor drives the reel shaft for playback, and the other motor drives the reel shaft for fast forwarding and rewinding. Although the reel shaft is configured to perform a driving operation, the driving of the reel shaft for such fast forwarding and rewinding is performed by switching the rotational direction of the electric motor. Such operation is performed by a device called a swing mechanism, but although such a device has the advantage of being simple in construction, it has the disadvantage of being expensive.

(C) Purpose of the Invention The present invention seeks to provide a drive device in which a reel shaft for playback, fast-forwarding, and rewinding operations is driven by a single electric motor capable of forward and reverse rotation. be.

(D) Structure of the Invention The present invention comprises a reversible electric motor which is rotated in the opposite direction to that during rewinding operation and playback and fast forwarding operation, and a first drive gear whose rotation is transmitted by a belt. A first rotating body is attached to the first rotating body, and a second driving gear and a third driving gear having a diameter smaller than the diameter of the second driving gear are attached. a control plate that is displaced to a stop position, a playback position, a fast-forward position, and a rewind position; a take-up reel shaft gear formed on a take-up reel shaft; and a take-up reel shaft gear formed on a supply reel shaft. a first transmission gear rotatably mounted on a shaft fixedly mounted on the control plate and meshing with the first drive gear when the control plate is in the play position; a second transmission gear mounted on the shaft for rotation with the first transmission gear and meshing with the third drive gear when the control plate is in the fast forward or rewind position; The clutch mechanism is configured such that the control plate meshes with the take-up reel shaft gear when the control plate is in the playback position, and meshes with the take-up reel shaft gear and the second drive gear when the control plate is in the fast forward position; and a third transmission gear that meshes with the supply reel shaft gear and the second drive gear when in the rewind position, and during playback operation, the clutch mechanism is used as a slip mechanism for driving the take-up reel shaft, and fast forwarding is performed. Also, the clutch mechanism is used as a swinging mechanism for the control plate during the rewinding operation.

(e) Examples The drawings all relate to the drive device of the present invention.
The figure is a sectional view of the main parts showing the vertical positional relationship of each member, Fig. 2 is a plan view of the main parts showing the regenerating state, Fig. 3 is a plan view of the main parts showing the stopped state, and Fig. 4 is a plan view of the main parts showing the stopped state. FIG. 5 is a plan view of the main parts showing the playback state, and FIG. 5 is a plan view of the main parts showing the fast forwarding state. In the figure, 1 is a capstan shaft that is rotatably attached to a fixed substrate 2 and drives the magnetic tape at a constant speed in cooperation with a pinch roller (not shown) during playback, and 3 is fixed to the capstan shaft 1. The flywheel is configured such that rotation from an electric motor (not shown) is transmitted by a belt, and the first drive gear 4 is integrally formed. A rotating body 5 is rotatably attached to a shaft 7 fixed to a fixed base plate 6, and the rotation of the flywheel 3 is accelerated and transmitted by a belt 8, and rotates integrally. Preferably, a second drive gear 9 and a third drive gear 10 having a smaller diameter than the second drive gear 9 are provided. Reference numeral 11 is a first plunger that is pulled during a reproducing operation, and reference numeral 12 is a sliding plate that is biased in the direction of arrow (A) by a spring 13 and that controls the displacement of the magnetic head and pinch roller to the operating position. , control hole 14
is formed and connected so as to be displaced in the direction of arrow (B) by the suction operation of the plunger 11. 15 is a second plunger that performs suction operation during fast forwarding and rewinding operations;
Reference numeral 6 denotes a control member which is biased in the direction of arrow (A) by a spring 17 and is displaced in the direction of arrow (B) by the suction operation of the second plunger 15. It is being Reference numeral 19 denotes a control plate that is swingably and slightly swingably attached to the fixed board and is biased by a spring 20, and cooperates with the control hole 14 formed in the sliding plate 12. A circular arc portion 22 is formed that comes into contact with the control pin 21 and the control portion 18 formed on the control member 16 . In such a configuration, the control plate 19 is in the stop position when both the first plunger 11 and the second plunger 15 are in the non-suction state, in the regeneration position when the first plunger 11 is in the suction state, and in the regeneration position when the first plunger 11 and the second plunger 15 are in the non-suction state. 15 is in a suction state, it is configured to be displaced to a fast forward position or a rewind position. A first transmission wheel 23 is rotatably attached to a shaft 24 fixed on the control plate 19 and meshes with the first drive gear 4 when the control plate 19 is in the stop position or the regeneration position. , 25 are mounted on the shaft 24 to rotate together with the first transmission gear 23, and are connected to the third drive gear 10 when the control plate 19 is in the fast forward or rewind position.
The second transmission gear meshes with the second transmission gear. 26 is a third transmission gear to which the rotation of the second transmission gear 25 is transmitted via the felt 27; 28 is a spring that urges the third transmission gear 26 in the direction of the second transmission gear 25 to press against the felt 27; The second transmission gear 25, the felt 27, and the third transmission gear 26 constitute a clutch mechanism. 29 is a take-up reel shaft rotatably attached to the fixed substrate 2, and a take-up reel shaft gear 30 is formed thereon. 31 is a supply reel shaft rotatably attached to the fixed substrate 2, and a supply reel shaft gear 32 is formed thereon. In such a configuration, the third transmission gear 26 meshes with the take-up reel shaft gear 30 when the control plate 19 is in the playback position, and meshes with the take-up reel shaft gear 30 and the take-up reel shaft gear 30 when the control plate 19 is in the fast forward position. The supply reel shaft gear 32 meshes with the drive gear 9 and is in the rewinding position.
and the second drive gear 9 so as to mesh with each other. Although the drive mechanism according to the present invention is configured in this manner, the drive circuit is configured such that the electric motor that rotationally drives the flywheel 3 rotates in the opposite direction when performing a rewind operation than during playback and fast forward operations. ing.

The present invention is constructed as described above, and its operation will be explained next. When the tape recorder is in a stopped state, both the first plunger 11 and the second plunger 15 are in a non-suction state. When the first plunger 11 is in a non-suction state, the sliding plate 1
2 is located at a position displaced in the direction of arrow (A) from the position shown in FIG. It is in a state in which it is in contact with the regulating portion 14a. Therefore, in such a state, the control plate 19 is affected by the contact between the control pin 21 and the first regulating portion 14a, the contact between the control portion 18 of the control member 16 and the circular arc 22, and the urging force of the springs 17 and 20. Therefore, it is held in the stopped position. FIG. 3 shows the relationship between the gears when the control plate 19 is at the stop position. In such a state, the first drive gear 4 and the first transmission gear 23
The gears are in mesh with each other, but the other gears are in non-mesh state. Further, in such a stopped state, the electric motor to which power is supplied is in a stopped state.

When a playback operation is performed while the tape recorder is in the above-mentioned stopped state, power is supplied to the first plunger 11 to perform a suction operation, and power is supplied to the electric motor to start rotation. When the first plunger 11 performs a suction operation, the sliding plate 12 is displaced in the direction of arrow (B) against the biasing force of the spring 13, resulting in the state shown in FIG. 2. When the sliding plate 12 is displaced to the position shown in FIG. 2, the control pin 21 formed on the control plate 19 comes into contact with the second restricting portion 14b of the control hole 14 formed on the sliding plate 12. With this operation, the control plate 19 is rotated clockwise from the stop position while being guided by the contact between the control part 18 and the arc part 22 of the control member 16, and is held at the playback position shown in FIG. be done.
FIG. 4 shows the relationship between the gears when the control board 19 is in the regeneration position.
The drive gear 4 and the first transmission gear 23 mesh with each other, and the third
The transmission gear 26 and the take-up reel shaft gear 30 are brought into meshing state. In this state, the rotation of the electric motor is transmitted to the flywheel 3 by the belt, and the flywheel 3 starts rotating. When the flywheel 3 rotates, the flywheel 3
The first drive gear 4 integrally formed with the arrow
Rotate in direction (C). When the first drive gear 4 rotates in the direction of arrow (C), the rotation is transmitted to the first transmission gear 23 meshing with the first drive gear 4, causing the first transmission gear 23 to rotate in the direction of arrow (D). It will be done. When the first transmission gear 23 rotates, the first transmission gear 23
A second transmission gear 25 provided to rotate together with the clutch mechanism is rotated in the same direction, and the rotation of the second transmission gear 25 is transmitted to a third transmission gear 26 via a felt 27 constituting a clutch mechanism. . Rotation is transmitted to the third transmission gear 26 and the third
When the transmission gear 26 rotates in the direction of the arrow (E), the rotation is transmitted to the take-up reel shaft gear 30 that is meshed with the third transmission gear 26, and the take-up reel shaft gear 30 rotates in the direction of the arrow (F). rotationally driven in the direction. When the take-up reel shaft gear 30 is rotationally driven, the take-up reel shaft 29 is rotated to run the magnetic tape, but the rotation of the electric motor is transmitted to the take-up reel shaft 29 via a clutch mechanism. Therefore, a driving operation for reproduction is performed. In this reproduction state, a pinch roller (not shown) is pressed against the capstan shaft 1 to drive the magnetic tape at a constant speed.

As described above, the driving operation of the rewind reel shaft 29 for the reproducing operation is performed, but next, the fast forwarding operation will be explained. When a fast forward operation is performed while the tape recorder is in a stopped state, power is supplied to the second plunger 15 and it performs a suction operation, and power is supplied to the electric motor and it starts rotating, but the direction of rotation is the same as the playback direction. . When the second plunger 15 performs a suction operation, the control member 16 is displaced in the direction of arrow (B) against the biasing force of the spring 17. When the control member 16 is displaced in the direction of arrow (B), the control plate 19 of the control section 18 of the control member 16
2, the control plate 19 is displaced in the direction of arrow (G) in FIG. 2 by the biasing force of the spring 20. When the control plate 19 is displaced, the second transmission gear 25 is transferred to the third drive gear 10.
At the same time, the third transmission gear 26 becomes in mesh with the second drive gear 9. In this state, the rotation of the electric motor is transmitted to the flywheel 3, and the rotation transmitted to the flywheel 3 is transmitted to the rotating body 5 by the belt 8. As a result of the rotation of the electric motor being transmitted to the rotating body 5 in this way, the rotating body 5
The second driving gear 9 and the third driving gear 10, which are provided to rotate integrally with the engine, are rotated in the direction of arrow (H). When the second drive gear 9 and the third drive gear 10 rotate in the direction of arrow (H), the third transmission gear 26 and the second transmission gear 25 are in mesh with the second drive gear 9 and the third drive gear 10. are both rotated in the direction of arrow (E). In this way, the second transmission gear 25 and the third transmission gear 26 are rotationally driven, but since the diameter of the second drive gear 9 is larger than the diameter of the third drive gear 10, the rotational speed of the third transmission gear 26 is is faster than the rotational speed of the second transmission gear 25. The rotational speed of the third transmission gear 26 is the second
When the rotation speed is faster than the rotation speed of the transmission gear 25, slip occurs between the clutch mechanism and the felt 27, and the frictional force accompanying the slip causes the shaft 24 to rotate clockwise around the shaft 7. A biasing force acts. When such a biasing force acts on the shaft 24, the control plate 19 to which the shaft 24 is fixed rotates clockwise, and the third transmission gear 26 is displaced to a fast forward position where it meshes with the take-up reel shaft gear 29. do. FIG. 5 shows that the control board 1 is
9 shows the relationship between the gears when gear 9 is displaced to the fast forward position. In this state, the rotational force transmitted from the electric motor to the flywheel 3 is transferred to the take-up reel shaft gear 2 via the belt 8 - rotating body 5 - second drive gear 9 - third transmission gear 26.
9 to rotate the take-up reel shaft gear 29 in the direction of arrow (F). Since the diameter of the rotating body 5 whose rotation is transmitted from the flywheel 3 by the belt 8 is smaller than the diameter of the pulley portion 3a provided on the flywheel 3, the speed of the rotating body 5 is the rotational speed of the flywheel 3. It will be faster compared to . Therefore, the rotational speed of the take-up reel shaft 30 increases, and the magnetic tape is rapidly fed.

As described above, the drive operation of the take-up reel shaft 30 for the fast forward operation is performed, but the rewind operation will now be explained. When rewinding is performed while the tape recorder is in a stopped state, power is supplied to the second plunger 15 to perform a suction operation, and power is supplied to the electric motor to start rotating, but the direction of rotation is opposite to that of fast forwarding. become. Said second
When the plunger 15 performs the suction operation, the second transmission gear 25 and the third transmission gear 26 mesh with the third drive gear 10 and the second drive gear 9, respectively, as in the case of the rapid forward operation described above. During such a rewinding operation, the electric motor is rotated in the opposite direction to that during the fast forwarding operation, so that the second driving gear 9 and the third driving gear 1 are rotated.
0 is also rotated in the opposite direction. When the second drive gear 9 and the third drive gear 10 are rotated in the opposite direction to the fast forward operation, the second transmission gear 2
5 and the third transmission gear 26 are also rotated in the opposite direction, but in this case as well, the rotation speed of the third transmission gear 26 is faster than the rotation speed of the second transmission gear 25, so the shaft 7 is rotated relative to the shaft 24. A biasing force acts counterclockwise from the center. When such a biasing force acts on the shaft 24, the control plate 19 to which the shaft 24 is fixed
is rotated counterclockwise, and the third transmission gear 26 is displaced to the rewinding position where it meshes with the supply reel shaft gear 32. Although such a state is not shown in the figure, the rotational force transmitted from the electric motor to the flywheel 3 is transferred to the belt 8.
- Rotating body 5 - Second drive gear 9 - Third transmission gear 26
is transmitted to the supply reel shaft gear 32 through the supply reel shaft gear 32, and causes the supply reel shaft gear 32 to rotate in the direction of arrow (I). After such an operation is performed, the magnetic tape is rewinded.

In this embodiment, the displacement operation of the control plate 19 is controlled by the suction operation of the first plunger 11 and the second plunger 15, but it is also possible to control the displacement operation by providing a lever that can be manually displaced. It can also be configured.

(f) Effects of the Invention The drive device of the present invention has a clutch mechanism provided on a control plate that moves to a stop position, a playback position, a fast forward position, and a rewind position, and a slip for driving a take-up reel shaft during a playback operation. used as a mechanism,
The device is characterized in that it is used as a swinging mechanism for the control board during fast-forwarding and rewinding operations.With this arrangement, reproducing operation, fast-forwarding operation, and winding are performed by a single electric motor that can rotate forward and backward. The reel shaft drive operation for the return operation can be performed with a simple configuration, and the present invention is most suitable as a drive mechanism for a tape recorder.

[Brief explanation of the drawing]

The drawings all relate to the drive device of the present invention, and FIG. 1 is a cross-sectional view of the main parts showing the vertical positional relationship of each member, FIG. 2 is a plan view of the main parts showing the regenerated state, and FIG.
4 is a plan view of the main part showing the stopped state, FIG. 4 is a plan view of the main part showing the playback state, and FIG. 5 is a plan view of the main part showing the fast forward state. Explanation of main drawing numbers, 1...capstan shaft, 3...
Flywheel, 4...First drive gear, 5...Rotating body, 9...Second drive gear, 10...Third drive gear, 11...First plunger, 12...Sliding plate, 15... Second plunger, 16... Control member, 19... Control plate, 23... First transmission gear, 2
5...Second transmission gear, 26...Third transmission gear, 2
9... Take-up reel shaft, 30... Gear for take-up reel shaft, 31... Supply reel shaft, 32... Gear for supply reel shaft.

Claims (1)

[Claims] 1. A tape recorder equipped with a forward-reversible electric motor that rotates in the opposite direction to that during playback and fast-forward operations during a rewind operation, the rotation of the electric motor being transmitted by a belt, and a first drive gear is attached. A first rotary body, a second drive gear to which the rotation of the first rotary body is transmitted at increased speed through a belt, and a second drive gear and a third drive gear having a diameter smaller than that of the second drive gear. A rotating body, a control plate that is displaced to a stop position, a playback position, a fast forward position, and a rewind position, a take-up reel shaft gear formed on a take-up reel shaft, and a supply reel formed on a supply reel shaft. a first transmission gear rotatably mounted on a shaft fixed on the control plate and meshing with the first drive gear when the control plate is in the play position; a second transmission gear that is mounted to rotate with the first transmission gear and meshes with the third drive gear when the control plate is in the fast forward or rewind position; together with the second transmission gear, a clutch mechanism is configured; At the same time, when the control plate is in the playback position, it meshes with the take-up reel shaft gear, and when it is in the fast forward position, it meshes with the take-up reel shaft gear and the second drive gear, and is in the rewind position. and a third transmission gear that meshes with the supply reel shaft gear and the second drive gear, the clutch mechanism is used as a slip mechanism for driving the take-up reel shaft during regeneration operation, and during fast forwarding and rewinding operations. A drive device for a tape recorder, characterized in that the clutch mechanism is used as a swinging mechanism for the control plate.