JPH02220249A - Pinch roll mechanism - Google Patents

Abstract

PURPOSE:To shorten the length of a cassette groove and to miniaturize a device by turning a pinch roll reaching the cassette storage-side end part of a guide groove, and making a guide roll and the pinch roll parallel with the lid face of a cassette. CONSTITUTION:When a pinch roll 7 is in the storage position on the side of a cassette C, a supporting member 5 of the pinch roll 7 is pressed by a guide member 10, and the pinch roll 7 and a guide roll 9 are housed approximately in parallel with the lid face. At the time of recording or reproducing, a pinch roll block 3 is moved along a guide groove 2, and the pinch roll 7 and the guide roll 9 draw out a tape from the cassette C, and the supporting member 5 is separated from the guide member 10; and therefore, the pinch roll 7 is turned counterclockwise by the force of a spring 8, and the pinch roll 7 and the guide roll 9 are arranged in the same direction as the guide groove 2. When the supporting member 5 comes into contact with a stopper 11 provided on the pinch roll block 3, turning of the supporting member 5 due to the spring 8 is stopped.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to a digital audio tape player (DAT).
) In a magnetic recording device such as a VTR in which recording and playback are performed by bringing a tape stored in a cassette into contact with a rotating head, the tape pulled out from the cassette is connected to the capstan shaft on the recording device side. This relates to a pinch roller mechanism for running at a constant speed.

[Prior Art] In a magnetic recording device using a rotating head such as a DAT, since recording and playback are performed by winding the tape around the rotating head, it is necessary to pull out the tape from a cassette installed in the device. . Therefore, the pinch roller, which runs the tape between it and the capstan shaft, is moved from its storage position inside the cassette to the capstan shaft, which is located near the rotating head, while pulling out the tape. There is a need.

Therefore, in the conventional pinch roller mechanism, a guide groove is provided between the storage position of the pinch roller and the contact position with the capstan shaft, and the pinch roller block supporting the pinch roller is run in the guide groove. , the pinch roller could take two positions.

That is, as shown in FIG.
A guide groove 2 is provided from the mounting position to the vicinity of the capstan shaft S. A pinch roller block 3 is movably mounted in the guide groove 2 using pins 3a provided at the bottom thereof. A pinch roller support member 5 is provided on the pinch roller block 3 so as to be rotatable about a support shaft 4, and a pinch roller 7 is rotatably mounted on a support shaft 6 on the pinch roller support member 5. Ta. Then, the pinch roller block 3 and the support member 5
A spring 8 is tensioned between the pinch roller block 3 and the pinch roller block 3.
Unless the support member 5 is pressed by another member during playback),
The pinch roller 7 was separated from the capstan shaft S.

Further, in the pinch roller mechanism as described above, not only the pinch roller 7 but also a guide roller 9 for guiding the tape pulled out from the pinch roller 7 toward the cassette side is provided on the pinch roller block 3. The positional relationship between the guide roller 9 and the pinch roller 7 plays an important role in determining the contact angle between the pinch roller 7 and the tape, and the guide roller 9 is essential in this type of mechanism. there were.

[Problems to be Solved by the Invention] By the way, the guide roller 9 and the pinch roller 7 are as follows:
The pinch rollers are arranged vertically along the moving direction of the block 3 so as not to contact other members on the substrate 1 when the pinch roller block 3 moves.

At the end of the guide groove 2 on the capstan shaft S side, the cassette C
30 to 40 degrees to the lid (lid for tape protection)
It was designed to stop at a certain angle.

However, the insertion space for the pinch roller 7 and guide roller 9 provided inside the lid of the cassette C is
It is regulated by the cassette and is provided parallel to the lid surface. Therefore, at the end of the guide groove 2 on the cassette side (the pinch roller storage position), the pinch roller 7 and the guide roller 9, which are arranged in series, need to be parallel to the lid surface.

Therefore, in the conventional pinch roller mechanism, the guide groove 2, which had an angle on the capstan shaft S side, is bent parallel to the lid surface near the cassette C.
A pinch roller 7 and a guide roller 9 were housed in a cassette C.

However, providing the parallel bent portion in the guide groove 2 as described above increases the length of the guide groove 2 accordingly.
There has been a problem that hinders miniaturization of magnetic recording devices.

The present invention solves the problems of the prior art as described above, and enables the pinch roller and the guide to be housed parallel to the lid surface of the cassette without providing a bent part parallel to the guide groove, thereby enabling magnetic recording. It is an object of the present invention to provide a pinch roller mechanism that achieves miniaturization of the device.

[Structure of the Invention] In order to achieve the above-mentioned object, the pinch roller mechanism of the present invention includes a pinch roller support member rotatably provided on the pinch roller plotter, and a pinch roller support member provided in the vicinity of the end of the guide groove on the storage position side. is provided with a guide member for rotating the pinch roller support member with respect to the pinch roller block so as to make the direction in which the pinch roller and guide roller are arranged different from the direction in which the guide groove extends.

[Function] In the pinch roller mechanism of the present invention having the above configuration, even if the guide groove itself does not have a portion parallel to the lid surface of the cassette, the pinch roller mechanism that has reached the end of the guide groove on the cassette storage side Rotating the roller with its support member,
The guide roller and the pinch roller can be made parallel to the lid surface of the cassette. As a result, the length of the guide groove can be shortened, and the size of the magnetic recording device can be reduced accordingly.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to FIG. Incidentally, the same members as those of the conventional type shown in FIG. 2 are given the same reference numerals, and the description thereof will be omitted.

In this embodiment, from the cassette C side to the capstan shaft S
The guide groove 2 extending to the side is connected to the pinch roller block 3.
It is provided so as to be substantially perpendicular to the lid surface of the cassette C so that it can be pulled out from the bottom of the cassette C toward the capstan shaft S side by the shortest distance. Therefore, at the end of the guide groove 2 on the cassette side, the pinch roller block 3 is substantially perpendicular to the lid surface of the cassette.

On the other hand, a guide member 10 is fixed near the cassette-side end of the guide groove 2 on the substrate 1 in a direction substantially perpendicular to the guide groove 2, that is, substantially parallel to the lid surface of the cassette. This guide member 10 is arranged above the pinch roller block 3, and when the pinch roller block 3 guided by the guide groove 2 reaches the cassette side end of the guide groove 2, the pinch roller block 3 is placed below the guide member 10. The part on the cassette side of No. 3 can be inserted into it.

The tip of the guide member 10 is in contact with the side portion 5a of the pinch roller support member 5 on the pinch roller block 3,
When the pinch roller block 3 reaches the cassette side end of the guide groove 2, the pinch roller support member 5 is pressed by the tip of the guide member 10 and rotates clockwise in the figure, and the pinch roller 7 and guide roller 9 are rotated clockwise in the figure. The alignment direction with guide groove 2 is
This direction is different from the direction of extension of the cassette, and is in the same direction as the lid surface of the cassette.

In the pinch roller mechanism of this embodiment configured as described above, when the pinch roller 7 is in the storage position on the cassette side, the support member 5 of the pinch roller is pressed by the guide member 10 as described above. , the pinch roller 7 and the guide roller 9 are housed in the cassette in a state where they are lined up substantially parallel to the lid surface. On the other hand, during recording and reproduction of the magnetic recording device, the pinch roller block 3 moves along the guide groove 2 while the pinch roller 7 and the guide roller 9 pull out the tape from inside the cassette. In that case, since the support member 5 separates from the guide member 1o, the pinch roller 7 rotates counterclockwise in the figure by the force of the spring 8 provided between the pinch roller block 3 and the pinch roller 7 and the guide roller 9. The alignment direction is the same direction as the moving direction of the pinch roller block, that is, the same direction as the guide groove 2. The rotational position of the support member 5 by the spring 8 is determined by the support member 5 coming into contact with a stopper 11 provided on the pinch roller block 3.

[Effects of the Invention] As described above, according to the present invention, the pinch roller rotatably supported on the pinch roller block is moved around the cassette by using the guide member at the end of the guide groove on the six-set side. The guide groove can be shortened by an extremely simple method of rotating in substantially the same direction as the lid surface, making it possible to provide a pinch roller mechanism for a compact magnetic recording device.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the pinch roller mechanism according to the present invention, and FIG. 2 is a plan view showing a conventional pinch roller mechanism. DESCRIPTION OF SYMBOLS 1... Board, 2... Guide groove, 3... Pinch roller block, 4... Support shaft, 5... Pinch roller support member, 6... Support shaft, 7... Pinch roller , 8...
Spring, 9... Guide roller, 10... Guide member, 11... Stopper, S... Capstan shaft,
C...Cassette. Seki Diagram

Claims (1)

[Scope of Claims] A pinch roller mechanism for a magnetic recording device that includes a rotating head and is configured to pull out a tape stored in a cassette and bring it into contact with the rotating head, the capstan rotating at a constant speed. A shaft, a pinch roller that rotates as a result of the capstan shaft and runs the tape, a guide groove provided from the point of contact between the pinch roller and the capstan shaft to the storage position inside the cassette, and the tape that is guided by the guide groove. a pinch roller block that travels with the pinch roller block; and a guide member that is provided on the side of the pinch roller storage position of the guide groove and rotates the pinch roller support member with respect to the pinch roller block against the spring. Pinch roller mechanism.