JPH045084Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a tape recorder, and relates to a reel shaft drive device that transmits rotation of an electric motor to the reel shaft.

(b) Prior Art The reel shaft drive operation in a tape recorder includes the drive operation of the take-up reel shaft for playback and recording operations, the drive operation of the take-up reel shaft for fast forward operation, and the drive operation of the take-up reel shaft for rewind operation. There is a drive movement of the rewind reel shaft. Recent tape recorders generally use gears as a transmission means to efficiently and reliably transmit the rotation of the electric motor to the reel shaft, and such technology is disclosed in Japanese Patent Application Laid-Open No. 59-24462, for example. There are some that have been disclosed. Additionally, ultra-small tape recorders used as memos have become popular, but such tape recorders often require repeated playback and rewind operations. Therefore, in such a tape recorder, the rewinding operation member is not locked in an operating position, and the rewinding operation is released when the operating force on the rewinding operation button is cut off.

(c) Problems to be solved by the invention In a tape recorder configured to transmit the rotation of the electric motor to the reel shaft using gears, the rotation of the electric motor is transmitted to the take-up reel shaft and the rewind reel shaft. If the same gear is used as the drive gear, the drive rotation directions of the take-up reel shaft and the unwind reel shaft will be opposite. It is incorporated into one side of the transmission mechanism to the return reel shaft. The meshing relationship between the drive gear and the transmission gear includes a biting relationship in which the transmission gear receives force in the meshing direction due to the rotational force of the drive gear, and a biting relationship in which the transmission gear receives force in the non-meshing direction due to the rotational force of the drive gear. There are two types of escape relationships. In such a relationship, in order to suppress noise when the gears mesh, it is preferable to have the two gears in a biting relationship, and in the tape recorder mentioned above, rewinding operations are performed more often than fast forwarding operations. The gears constituting the transmission mechanism to the unwinding reel shaft have a biting relationship. In such a configuration, when a rewind operation is performed and the magnetic tape is rewound to the starting end, the rotation of the rewind reel shaft is stopped, but at this time, the transmission gear receives a force in the biting direction due to the rotational force of the drive gear. Because of this, the transmission gear remains engaged with the drive gear. In order to remove such meshing, it is conceivable to increase the elastic force of the spring provided to return the transmission gear to the non-operating position, but if the elastic force of the spring is increased, the operation to perform the unwinding operation will occur. There is a problem in that the force increases and the operational feeling deteriorates. The present invention aims to provide a reel shaft drive device that is improved in this respect.

(d) Means for Solving the Problems The reel shaft drive device of the present invention includes a displacement lever rotatably mounted on a fixed base plate, and a motor that is rotatably mounted on the displacement lever. A drive gear that rotates when rotation is transmitted thereto, a reel gear that is provided to rotate integrally with the unwinding reel shaft, and a reel gear that is rotatably attached to a fixed base plate and is always in mesh with the reel gear. An intermediate gear, a rotary lever that is rotatably mounted coaxially with the rotation axis of the intermediate gear and is displaced and held in an operating position by a rewinding operation, and a rotary lever that is rotatably mounted on the rotary lever. and a transmission gear that is always in mesh with the intermediate gear and meshes with the drive gear when the rotary lever is in the operating position.

(E) Effect The present invention has a drive gear rotatably mounted on a rotatably mounted displacement lever, and the end time of the magnetic tape during rewinding. Therefore, the displacement lever is rotatably displaced, and the rotary lever to which the transmission gear is rotatably attached is rotated in a direction in which the transmission gear is separated from the drive gear by using the rotational displacement force of the displacement lever. It was designed to encourage them.

(F) Embodiments The drawings all relate to the reel shaft drive device of the present invention, and FIG. 1 is a plan view showing the stopped state, FIG. 2 is a plan view showing the fast-forward operating state, and FIG. 3 is a plan view showing the rewinding operating state. FIG. In the figure, reference numeral 1 designates a take-up reel shaft to which a fixed base plate 2 is rotatably attached, and a reel gear 3 is provided to rotate integrally therewith. Reference numeral 4 denotes a first intermediate gear which is rotatably attached to the fixed base plate 2 and is always in mesh with the reel gear 3 of the take-up reel shaft 1. 5 is a rewinding reel shaft rotatably attached to the fixed base plate 2, and a reel gear 6
are provided to rotate together. 7 is rotatably attached to the fixed base plate 2 by a shaft 8, and a reel gear 6 of the unwinding reel shaft 5.
The second intermediate gear is always in mesh with the second intermediate gear.
9 is a displacement lever rotatably attached to the fixed base plate 2 by a shaft 10; 11 is the displacement lever 9;
It is a drive gear that is rotatably attached to the top and rotates by the rotation of an electric motor (not shown) being transmitted to the first intermediate gear 4 when the displacement lever 9 is displaced to the operating position during a fast forward operation. They are constructed to fit together. Reference numeral 12 denotes a fast-forward operation lever that is moved from a non-operating position to an operating position in the direction of arrow A during a fast-forward operation, and is biased by a spring 14 in the direction of arrow B, which is the non-operating position. 15 is the fast forward operation lever 12
It is a contact piece formed in the above-mentioned displacement lever 9, and has the function of abutting against the contact portion 16 formed on the displacement lever 9 and regulating the displacement position of the displacement lever 9.
Reference numeral 17 denotes a connection spring whose one end is fixed to the displacement lever 9 and the other end is fixed to the fast-forward operation lever 12, and when the fast-forward operation lever 12 is displaced to the operating position, the displacement lever 9 It has the function of biasing and displacing in the direction of the operating position. Reference numeral 18 denotes a rewinding operation lever formed with an operating portion 19 that is operated during a rewinding operation and is displaced from a non-operating position to an operating position in the direction of arrow B during a rewinding operation; 20 is the second intermediate gear; 7 is a rotary lever that is rotatably mounted on a shaft 8 and is biased to rotate clockwise by a spring 21, and is a rotary lever that is rotatably mounted on a shaft 8 of 7 and is biased to rotate clockwise by a spring 21. , so that it can be rotated in the counterclockwise direction, which is the operating position. Further, the rotating lever 20 is formed with an abutting piece 23 that comes into contact with an abutting portion 22 formed on the fast-forward operation lever 12 . Reference numeral 24 denotes a transmission gear rotatably mounted on the rotary lever 20 and always in mesh with the second intermediate gear 7, which controls the rotation of the rotary lever 20 when in the rewind operation state. It is configured to mesh with the drive gear 11 by displacement. In such a configuration, the drive gear 1
1 is a transmission gear 24 which is rotated clockwise by an electric motor and meshes with the drive gear 11 during the rewinding operation.
is adapted to receive force in the meshing direction due to the rotational force of the drive gear 11. The reel shaft drive device of the present invention is constructed as described above, and its operation will be explained next.

The state shown in FIG. 1 is a stopped state, and both the fast-forward operation lever 12 and the rewind operation lever 18 are in non-operating positions. Therefore, the displacement lever 9 and the rotation lever 20, whose displacement positions are regulated by the fast-forward operation lever 12 and the rewind operation lever 18, are respectively in non-operating positions, and the drive gear 1
1 is located at a position spaced apart from the first intermediate gear 4, and the transmission gear 24 is located at a position spaced apart from the drive gear 11. If a fast-forward operation is performed in such a stopped state, the operating force applied to the operating portion 13 causes the fast-forward operating lever 12 to be displaced in the direction of arrow A against the biasing force of the spring 14. When the fast-forward operation lever 12 is displaced to the operating position in the direction of arrow A, the movement of the contact piece 15 formed on the operation lever 12 and the urging force of the connection spring 17 cause the displacement lever 9 to move clockwise, that is, due to the urging force of the connection spring 17. A rotational displacement force is applied in the direction of the operating position. As a result, the displacement lever 9 is rotated clockwise about the shaft 10, and the drive gear 11 rotatably attached to the displacement lever 9 meshes with the first intermediate gear 4 as shown in FIG. Becomes in a state of ivy. Therefore, the rotation of the electric motor is transmitted to the take-up reel shaft 1 via the drive gear 11, the first intermediate gear 4, and the reel gear 3, and a driving operation for rapid forwarding of the take-up reel shaft 1 is performed. . The fast-forward operation is performed in this manner, but when the operating force to the operating portion 13 is cut off, the fast-forward operating lever 12 is returned to the non-operating position in the direction of arrow B by the biasing force of the spring 14. When the rapid-forward operation lever 12 returns to the non-operating position, the displacement lever 9 that was in the operating position is rotated to the non-operating position, and the drive gear 11 rotatably attached to the displacement lever 9 moves to the first intermediate position. It is spaced apart from the gear 4. When the operating force to the operating portion 13 provided on the fast-forward operating lever 12 is cut off, the above-described operation is performed and the tape recorder enters the stopped state shown in FIG. 1.

As described above, the drive operation of the take-up reel shaft 1 for fast forwarding in this embodiment is performed, but next, the drive operation of the rewind reel shaft 5 will be explained. The rewinding operation of the tape recorder is performed by operating an operating section 19 formed on the rewind operating lever 18. When the operating section 19 is operated when the tape recorder is in the stopped state shown in FIG. It is rotated counterclockwise against the biasing force of the spring 21. Third
The figure shows a state in which such an operation has been performed, and the transmission gear 24 rotatably attached to the rotary lever 20 is in mesh with the drive gear 11. Also, when in such a state, the rotating lever 2
The contact piece 23 formed at 0 is brought into contact with the contact portion 22 formed on the fast-forward operation lever 12 described above. When the rewinding operation is performed, such an operation is performed and the state shown in FIG. 5, and a drive operation for rewinding the rewind reel shaft 5 is performed. Although the rewinding operation is performed in this way, the operation section 19
When the operating force is cut off, the rewind operating lever 1 is moved together with the rotation lever 20 by the biasing force of the spring 21.
8 is returned to the inoperative position shown in FIG. When the rotary lever 20 is displaced to the non-operating position, the transmission gear 24 rotatably attached to the rotary lever 20 is separated from the drive gear 11. When the operating force to the operating portion 19 provided on the rewinding operating lever 18 is cut off, the above-described operation is performed and the tape recorder enters the stopped state shown in FIG. 1. The rewinding operation is performed in this manner.Next, the operation when the magnetic tape is rewound to the starting end during the rewinding operation will be described. When the magnetic tape is rewound to the starting end, the rewind reel shaft 5 is forcibly stopped from rotating. When the rewinding reel shaft 5 stops rotating, a reel gear 6 provided to rotate integrally with the reel shaft 5, a second intermediate gear 7 in mesh with the reel gear 6, and the second intermediate The transmission gear 24, which is in mesh with the gear 7, is forced to stop rotating. On the other hand, the drive gear 11 which is meshed with the transmission gear 24 is in a state where the rotation of the electric motor is transmitted and rotates. Therefore, when the transmission gear 24 is stopped, the drive gear 11 receives a reaction force from the unwinding reel shaft 5 and receives a displacement force in the direction of arrow C.
As a result, the displacement lever 9 to which the drive gear 11 is rotatably attached is rotated clockwise about the shaft 10. When the displacement lever 9 is rotated clockwise, the contact portion 16 formed on the displacement lever 9 engages the fast-forward operation lever 12.
The contact piece 15 formed in the fast-forwarding operation lever 12 is pressed and displaced in the direction of the arrow A. When the fast-forward operating lever 12 is displaced in the direction of arrow A, the contact portion 22 formed on the fast-forward operating lever 12 presses the contact piece 23 formed on the rotating lever 20, causing the rotation. Lever 2
0 will receive a rotational displacement force in the clockwise direction. Therefore, when the magnetic tape is rewound to the starting end and the operating force to the operating portion 19 of the rewind operating lever 18 is cut off, the rotational displacement force and the biasing force of the spring 21 are changed due to the reaction force to the drive gear 11. Therefore, the rotation lever 20 and the rewind operation lever 18 are returned to their non-operating positions. In this way, the rotation return force to the non-operation position is obtained from the electric motor depending on the operation position of the rotation lever 20, so that the drive gear 1
Even if the meshing relationship between the driving gear 11 and the transmission gear 24 is a biting relationship, the meshing between the driving gear 11 and the transmission gear 24 can be reliably disengaged.

In this embodiment, the rewinding operation is explained in which the rewinding operation is performed when the rewinding operation is in the stopped state. However, the review operation in which the rewinding operation is performed when the rewinding operation is performed when the rewinding operation is performed can also be performed by displacing the rewinding operation lever 18. This can be easily done by releasing the drive mechanism for this purpose.

(g) Effects of the invention The reel shaft drive device of the invention is able to prevent the occurrence of the problem at the end of the magnetic tape even if the meshing relationship between the drive gear and the transmission gear incorporated in the transmission mechanism to the reel shaft is a biting relationship. Since the disengagement force of the gears is obtained from the rotational force of the electric motor, the disengagement of the gears can be performed reliably.The present invention provides a drive for a tape recorder in which the reel shaft is driven using gears. This is the most suitable device.

[Brief explanation of the drawing]

The drawings all relate to the reel shaft drive device of the present invention, and FIG. 1 is a plan view showing the stopped state, FIG. 2 is a plan view showing the fast forward operating state, and FIG. 3 is a plan view showing the rewinding operating state. be. Explanation of main drawing numbers, 1... Take-up reel shaft, 2...
... Fixed board, 3, 6... Reel gear, 4... First
Intermediate gear, 5... Rewinding reel shaft, 7... Second intermediate gear, 9... Displacement lever, 11... Drive gear,
12... Operating lever for fast forwarding, 18... Operating lever for rewinding, 20... Rotating lever, 24... Transmission gear.

Claims (1)

[Scope of utility model registration request] a displacement lever which is rotatably attached to a fixed substrate and whose displacement position is regulated by a fast-forward operation lever; and a displacement lever which is rotatably attached to the displacement lever and is rotated by transmission of the rotation of the electric motor. a reel gear provided to rotate integrally with the unwinding reel shaft; and an intermediate gear rotatably attached to a fixed base plate and always in mesh with the reel gear.
a rotary lever that is rotatably mounted coaxially with the rotation axis of the intermediate gear, is displaced and maintained at an operating position by a rewinding operation, and comes into contact with the fast-forward operating lever when in the operating position; a transmission gear rotatably mounted on the rotary lever, always in mesh with the intermediate gear, and meshing with the drive gear in a biting relationship when the rotary lever is in the operating position; When the magnetic tape ends in a rewinding state, the displacement lever is rotated by a reaction force received by the drive gear due to the stoppage of rotation of the intermediate gear and the transmission gear due to the stoppage of rotation of the rewind reel shaft; The rotational displacement force of the displacement lever displaces the fast-forward operation lever, and also rotates the rotary lever in contact with the fast-forward operation lever toward a non-operating position. A reel shaft drive device for tape recorders.