JPH05314588A - Tape drive - Google Patents

Abstract

(57) [Summary] [Object] To provide a tape drive device capable of reducing the size and weight of the device. A compression spring 1 that has a gear 9 that rotates by utilizing the rotational driving force of a capstan 8 and that generates a driving force in the rotational direction of a pinch roller by utilizing the rotational force of a rotating means 9.
1 is provided. [Effect] Since the driving force is generated in the rotation direction of the pinch roller, the force exerted by the pinch roller load against the tape running can be eliminated, so that the high tape driving efficiency can be realized. As a result, the pinch roller pressing force exerting the maximum load on the mechanism can be reduced, and a tape drive device capable of reducing the size and weight of the mechanism can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tape recorder and a V recorder.
The present invention relates to a tape drive device used for TR and the like, and more specifically to a configuration of a pinch roller.

[0002]

2. Description of the Related Art In recent years, competition for miniaturization and weight reduction of tape recorders, video movies and the like has become intense in line with market demand. An example of the above-described conventional tape drive device will be described below with reference to the drawings.

FIG. 2 shows an example of a conventional tape drive device. In FIG. 2, reference numeral 21 is an elastic member, and 22 is a pinch roller bearing, which is configured to be automatically aligned by the clearance between the inner ring and outer ring of the ball bearing and the ball using the ball bearing. Reference numeral 23 is an intermediate member between the elastic member 21 and the pinch roller bearing 22, and the elastic member 21 and the intermediate member 23 are fixed by baking or the like. The pinch roller bearing 22 is held near the center of the intermediate member 23 by light press fitting.
Reference numeral 24 denotes a support shaft, and the elastic member 21 and the intermediate member 23 are rotatably attached about the support shaft 24 by a pinch roller bearing 22. 25 is a pinch roller bearing 22
It is a sleeve for preventing slipping out of the sheet and is press-fitted into the intermediate member 23. Reference numeral 26 is a sleeve for preventing the pinch roller bearing 22 from coming off, and is press-fitted into the support shaft 24. 27 is a tape and 28 is a capstan.

The operation of the tape drive device constructed as above will be described below.

As is well known, in a tape drive device, a tape 27 is pressed against a capstan 28 by a pinch roller so that the tape 27 is transported at a predetermined speed by the cooperation of the two. As shown in FIG. 4, a conventional device of this type generally uses a rubber member for the elastic member 21 in order to ensure running stability. When the pinch roller is pressed, the tape 27 is transferred while the elastic member 21 is deformed. ing.

[0006]

However, in the above-mentioned structure, the pinch roller load acts against the tape running, and therefore the force for driving the tape when the pinch roller load is present (hereinafter referred to as tape driving force). Is reduced. In order to prevent this, it is necessary to increase the pinch roller pressing force, which has a problem that it is a great obstacle to reducing the size and weight of the mechanism.

In view of the above problems, it is an object of the present invention to provide a tape drive device which can be made compact and lightweight while ensuring the reliability of the device.

[0008]

In order to solve the above problems, a tape drive device according to the present invention comprises a capstan which is rotationally driven and a capstan which is rotatably supported by a bearing and which sandwiches a tape-shaped medium. A pinch roller for transferring the tape-shaped medium by being pressed by the roller, rotation transmitting means for transmitting the rotation of the capstan, and rotational force of the rotation transmitting means for driving the pinch roller in the rotation direction. A pinch roller driving means is provided.

[0009]

According to the present invention, since the driving force is generated in the pinch roller rotation direction by the above-mentioned structure, the force exerted by the pinch roller load against the tape driving force can be eliminated.
High tape drive efficiency can be realized. As a result, the pinch roller pressing force exerting the maximum load on the mechanism can be reduced, and a tape drive device capable of reducing the size and weight of the mechanism can be provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tape drive device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a tape drive device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a rubber member, and 2 is a pinch roller bearing, which is configured to be automatically aligned by using a ball bearing and a clearance between the inner ring and the outer ring of the ball bearing and the ball.
Reference numeral 3 is an intermediate member between the rubber member 1 and the pinch roller bearing 2, and the rubber member 1 and the intermediate member 3 are fixed by baking or the like. The pinch roller bearing 2 is held near the center of the intermediate member 3 by light press fitting. Reference numeral 4 denotes a support shaft, and the rubber member 1 and the intermediate member 3 are attached by a pinch roller bearing 2 so as to be rotatable around the support shaft 4. Reference numeral 5 is a sleeve for preventing the pinch roller bearing 2 from coming off, and is press-fitted into the intermediate member 3. 6 is a sleeve for preventing the pinch roller bearing 2 from coming off,
Has been pressed into. 7 is a tape and 8 is a capstan. Further, 9 is a gear, which is press-fitted into the capstan 8. 10 is a stopper, which is press-fitted into the support shaft 4. Reference numeral 11 is a compression spring. Reference numeral 12 denotes a gear, which meshes with the gear 9 and is biased by the compression spring 11 toward the intermediate member 3. The value of the urging force of the compression spring 11 is set so that the value of the rotational torque transmitted to the pinch roller during tape running becomes substantially equal to the pinch roller load generated by the loss torque of the pinch roller bearing 2 or the like. The positioning of the gear 12 in the left-right direction is held by the clearance with the intermediate member 3. Further, the radius of the pinch roller is R, the radius of the capstan 8 is r 1, the radius of the pitch circle of the gear 9 is rc, and the radius of the pitch circle of the gear 12 is rp.
Then,

[0012]

[Equation 1]

The configuration is as follows. The operation of the tape drive device configured as described above will be described below with reference to FIG.

The tape 7 is capstan 8 with a pinch roller.
The tape 7 is pressure-bonded to the tape 7 and the tape 7 is transferred at a predetermined speed by the synergistic action of the two.
The gear 9 is rotated by the rotational drive of the gear, and the rotational force is transmitted to the gear 12. However, since the capstan 8, the pinch roller, the gear 9, and the gear 12 are configured as shown in (Equation 1), the gear 12 rotates faster than the pinch roller rotates. Further, since the gear 12 is biased by the compression spring 11 toward the intermediate member 3 of the pinch roller, slip occurs between the gear 12 and the intermediate member 3,
A driving force is generated in the rotation direction of the pinch roller. The driving force in the pinch roller rotation direction becomes substantially equal to the pinch roller load by setting the biasing force of the compression spring 11.

Conventionally, it has been considered that the tape drive is performed by moving the tape 7 while the rubber member 1 and the capstan 8 are in contact with each other. However, as a result of detailed examination of the phenomenon relating to the tape driving force, it was found through an experimental study that the tape driving force is represented by the following (Equation 2).

[0016]

[Equation 2]

From (Equation 2), in order to improve the tape driving force at the same pin pressure, it is conceivable to (1) improve μ and (2) lower Φ. Among these, the one caused by the shape of the pinch roller is (2). In (2), Φ is a pinch roller load. As a method of reducing the pinch roller load Φ, a method of using a ball bearing for the pinch roller bearing to reduce the load has been considered, but the conventional method has not been able to completely eliminate the pinch roller load. .. However, as shown in the present embodiment, the driving force is generated in the pinch roller rotation direction by utilizing the rotational force of the capstan 8, thereby completely eliminating the tape driving loss due to the pinch roller load, and thus the high tape driving efficiency Can be realized.

As described above, according to the present embodiment, since the pinch roller load can be eliminated by generating the driving force in the pinch roller rotating direction, high tape driving efficiency can be realized.

Gears are used as the rotating means in the present embodiment, but the present invention is not limited to this method, and a driving method is generated in the pinch roller rotating direction using a magnetic rotation method. You can A ball bearing was used for the pinch roller bearing. However, by using a slide bearing, the pinch roller diameter can be reduced, and the driving force for increasing the pinch roller load on the ball bearing in the pinch roller rotation direction can be increased. By doing so, the tape driving efficiency may be ensured. Further, in the present embodiment, the value of the driving force generated in the rotation direction of the pinch roller is equal to the value of the pinch roller load, but it is not always necessary to do so, and the set value may be changed according to the application of the device.

[0020]

As described above, according to the present invention, since a high tape driving efficiency can be realized, the pinch roller pressing force exerting the maximum load on the mechanism can be reduced, and the mechanism can be reduced in size and weight. It is possible to provide a tape drive device capable of

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a tape drive device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a tape drive device according to a conventional example.

[Explanation of symbols]

 1 rubber member 2 pinch roller bearing 3 intermediate member 4 support shaft 7 tape 8 capstan 9 gear 10 stopper 11 compression spring 12 gear

Claims (1)

[Claims] 1. A capstan that is rotationally driven, a pinch roller that is rotatably supported by a bearing, and that transports the tape-shaped medium by being pressed by the capstan with the tape-shaped medium sandwiched between the capstan and the capstan. And a pinch roller driving unit that receives the rotational force of the rotation transmitting unit and drives the pinch roller in the rotation direction thereof.