JP2903588B2 - Reel stand braking device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-performance, inexpensive, particularly double-acting, reel base braking device in a magnetic recording / reproducing apparatus.

2. Description of the Related Art In recent years, magnetic recording / reproducing devices have become high-performance,
An inexpensive reel stand braking device is required, and a reel stand braking device that is inexpensive, has a simple configuration, and can stably realize a predetermined braking force is desired.

Conventionally, a single-acting type (not shown) and a double-acting type (FIG. 2) have generally been used as the reel stand braking device.

 Hereinafter, the configuration will be described with reference to the drawings.

The single-acting reel stand braking device has a small number of parts and is inexpensive, but the braking force in the tape winding direction is a braking force by a spring force, and the braking force in the tape feeding direction is generally a desired value. Far above and indefinite.

For this reason, an abnormally high braking force is generated and the tape is often damaged, and a double-acting reel base braking device is generally used for a high-performance magnetic recording / reproducing apparatus.

Next, a double-acting reel stand braking device will be described with reference to FIG.

As shown in the figure, the braking device includes a main arm 2 rotatably provided on a base (not shown), a braking member 4 rotatably provided on the main arm 2 and abutting on the reel base 1. A first spring 5 mounted between the main arm 2 and the slave arm 3 and acting in the tape feeding direction, and a second spring mounted between the base and the main arm and acting in the tape winding direction 6
And a third spring 7 that is mounted between the slave arm 3 and the braking member 4 and moves the braking member 4 to a predetermined position when the braking member 4 is separated from the reel base 1. (Radio technology book "Hi-Fi tape recorder" S44.1
1.10 Published by Radio Technology Co., Ltd.)

Here, in order to provide a stable braking force, the braking member 4 has a shape that follows the outer periphery of the reel base 1 and is formed on the outer periphery of the reel base 1 at both the tape sending side and the tape winding side. The third arm 7 is rotatably engaged with the slave arm 3 so as to keep the gap between the reel arm 1 and the reel base 1 constant when the slave arm 3 is separated from the reel base 1 (that is, when braking is released). 3 is configured to contact the stopper portion a.

SUMMARY OF THE INVENTION In the conventional braking device as described above, in order to protect the tape, in addition to the members necessary for stably obtaining the desired braking force on the tape feeding side and the tape winding side, braking is performed. A member for setting the position of the member is required, and the cost, the assemblability, and the size of the apparatus itself are negative.

A member for setting the position of the braking member (third spring 7)
Is omitted, when the braking member 4 is separated from the reel base,
That is, in the tape running state, the position of the control member is not determined, so that depending on the position of the braking member, the braking member 4 abuts on the reel base 1 to prevent the tape from running stably and adversely affect audio and video. .

The conventional double-acting reel stand braking device has the above-mentioned drawbacks, and the present invention solves this disadvantage. A desired braking force can be stably obtained, and the reel stand is inexpensive with a simple configuration. It is intended to provide a braking device.

Means for Solving the Problems In order to achieve the above object, the present invention provides a spring for setting a position of a braking member when the braking member is separated from a reel base and a spring for applying a braking force on a tape winding side. It consists of two springs.

According to the present invention, with the above-described configuration, the reel stand braking device capable of stably supplying a desired braking force can be made simple, small, and inexpensive.

Embodiment An embodiment of the present invention will be described below with reference to FIG.

A main arm 8, a sub arm 9, a braking member 10, a first spring 11 acting in a tape feeding direction, and a first spring acting between a base (not shown) and the braking member 10 and acting in a tape winding direction. The basic structure for applying the braking force is the same as that of the conventional example. However, the second spring 12
Is applied directly to the braking member 10, and when the braking member 10 is separated from the reel base 1, that is, when the braking force is released, the braking member 10
And a line d connecting the center of rotation of the
By making the direction c in which the force of the spring 12 acts at an angle α in the direction shown in the figure, a couple in the direction A in the figure is given to the braking member, and the braking member is brought into contact with the stopper b of the slave arm 9. The stopper portion b of the slave arm 9 is provided so as to rotate the braking member to a predetermined position so as to keep the gap between the reel base 1 and the braking member 10 constant. Note that the angle α is preferably smaller under the condition that a couple can be applied to the braking member 10 in the A direction.

As described above, according to the present invention, the spring acting in the tape winding direction is provided with both of the application of the braking force and the application of the position setting force of the braking member, whereby the double-acting reel base is provided. The number of parts of the braking device can be reduced. Further, it is possible to stably supply a desired braking force in each direction with a simple configuration, and to supply a very reliable and inexpensive reel stand braking device.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a reel stand braking device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a configuration of a conventional reel stand braking device. 1 ... Reel stand, 8 ... Main radius, 9 ... Slave arm, 10
... Braking member, 11... First spring, 12... Second spring.

Claims (1)

(57) [Claims] 1. A reel base for driving a magnetic tape, a main arm rotatably provided on a base, a slave arm rotatably provided on the main arm, and a rotatable arm provided on the slave arm;
A braking member that abuts against the reel base and brakes, and a first spring that is mounted between the main arm and the sub arm and applies a braking force to the braking member in a first rotation direction of the reel base. And when the braking member is separated from the reel base, the braking member is rotated to a predetermined position when the braking member is separated from the reel base, and the braking member abuts on the reel base. And a second spring for applying a braking force to the braking member in the second rotation direction of the reel base when the braking member is actuated.