JP3146613B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a video tape recorder (VTR) or a PCM audio tape recorder.

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus of this kind, a magnetic tape in a cassette is pulled out by a loading guide, and the magnetic tape is wound around an outer peripheral surface of an inclined drum on which a rotating magnetic head is arranged, and the rotating magnetic head is rotated. The helical scan method of recording / reproducing is adopted. In this type of magnetic recording / reproducing apparatus, an inclination guide (tape post) for adjusting the magnetic tape to the inclination of the drum and a guide roller assembly are provided on a reciprocating loading guide. A fixed guide, a tension regulator, a rotation guide, a full-width erasing head, an impedance roller, and the like are provided separately from the loading guide along a running path of the magnetic tape pulled out by the loading guide.

[0003]

As described above, in a magnetic recording / reproducing apparatus having a conventional structure, an impedance roller or the like is provided separately from a loading guide to suppress vibration during tape running and reduce jitter. However, this structure has a large number of parts, which not only hinders the reduction in size and weight, but also increases the cost. Therefore, a structure that can reduce the number of parts without increasing the jitter, reduce the size and weight, and reduce the cost has been desired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the number of parts to reduce the size and weight, reduce the cost, and reduce the jitter. Is to provide.

[0005]

In order to achieve the above object, the present invention is directed to a magnetic recording and / or reproducing apparatus which rotates with the running of a magnetic tape.
A guide roller with a weight to guide the tape
In the magnetic recording and reproducing apparatus, the weight is substantially
Formed in a nut shape, and from the center toward the outer periphery
A plurality of radially extending notches are provided at equal intervals in the circumferential direction .

[0006]

According to this configuration, a guide roller with a weight is provided.
Therefore, since the guide roller and the impedance roller can be doubled, at least the impedance roller required in the conventional apparatus can be omitted. Also, changing the cut-out portion or the like Waits guide row La, it is possible to easily change the relief frequency band of the jitter.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a layout view of a main part of a magnetic recording / reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic enlarged sectional view taken along line AA of FIG. 1, each showing a tape loading completed state. .

1 and 2, a cassette 2 is detachably set on a chassis 1 of a magnetic recording / reproducing apparatus. Further, the magnetic tape 3 wound between the supply reel 2A and the take-up reel 2B in the cassette 2 is pulled out by a tape entrance side loading guide 4A and a tape exit side loading guide 4B, and this is rotated by a rotating magnetic head (not shown). A helical scan system is employed in which the recording and reproduction are performed by winding the recording medium around the inclined outer surface of a drum 5 provided with a rotating magnetic head.

Further, each loading guide 4A, 4B
Is mounted on a loading arm (not shown) arranged on the back side of the chassis 1. When the loading arm is rotated, the loading arm reciprocates in the guide grooves 6A and 6B together with the loading arm. With this movement, the loading position and the magnetic tape 3 where the magnetic tape 3 is wound around the outer periphery of the drum 5 are moved. The structure is such that it can be switched to the unloading position returned to the cassette 2. Further, a restriction block 8 is provided on the loading position to position the loading guides 4A and 4B.

On the other hand, the tape entrance side loading guide 4
The magnetic tape 3 pulled out by the tape entrance side loading guide 4A is located outside the guide groove 6A in which A moves.
A fixed guide 9, a tension regulator 10, a rotating roller 11, and a full-width erasing head 12 are provided along the traveling path of FIG.

On the other hand, outside the guide groove 6B in which the tape exit side loading guide 4B moves, the erasing head 13 is fixed along the running path of the magnetic tape 3 drawn out by the tape exit side loading guide 4B. A guide 14, a capstan 15, a pinch roller 16, and a fixed guide 17 are provided.

More specifically, the restriction block 8 includes:
The upper V-shaped positioning portion 8a and the lower V-shaped positioning portion 8b are integrally formed so as to be divided into upper and lower portions, respectively, and between the upper V-shaped positioning portion 8a and the lower V-shaped positioning portion 8b. Immediately above the lower V-shaped positioning portion 8b, a vertical positioning portion 8c protruding toward the cassette 2 is integrally formed.

Each of the restriction blocks 8 has substantially the same basic structure, and includes a guide base 19 and a guide base 1.
9, an inclined guide (tape post) 20 for adjusting the magnetic tape 3 to the inclination of the drum 5, and a guide roller assembly 21 also mounted on the guide base 19. And each regulation block 8
When the loading guides 4A and 4B are moved to the loading position, the upper end side of the guide roller assembly 21 (an upper flange 25 described later in this embodiment) contacts the upper V-shaped positioning portion 8a and is positioned. At the same time, the lower cylindrical portion 19a of the guide base 19 comes into contact with the lower V-shaped positioning portion 8b, and the protruding piece portion 19c of the guide base 19 slides below the vertical positioning portion 8c and is engaged therewith. The direction is determined.

Further, the guide roller assembly 21 is rotatably mounted via a pivot 22 fixed on the guide base 19 with screws 23, and includes a cylindrical guide roller portion 24 and a guide roller portion 24. An upper flange 25 fixedly and rotatably attached to an upper end portion; a donut-shaped weight 26 fixedly and rotatably fixed to a lower end side of the guide roller portion 24;
6 and a lower flange 27 fixed and attached to the lower end of the guide roller portion 24 so as to be integrally rotatable. FIGS. 3 to 5 show the guide roller assembly 21.
Is shown together with the pivot 22.

The weight 26 is for imparting an equivalent mass to the guide roller assembly 21. The weight 26 is balanced so that the rotation of the guide roller assembly 21 does not cause unevenness. A plurality of (three in this embodiment) are provided at equal intervals, and the notch 28 facilitates balance. The weight, shape and the like of the weight 26 are determined by the required equivalent mass. If the cutout amount of the cutout portion 28 is changed, the weight 26 26 common component materials can be used. In addition, the magnetic tape 3
Is formed as a step.

Therefore, in the magnetic recording / reproducing apparatus configured as described above, when the loading guides 4A and 4B move from the unloading position to the loading position, the magnetic tape 3 in the cassette 2 moves with the guide roller assembly 21 and the inclined guide. It is pulled out by 20 and wound around the outer peripheral surface of the drum 5, and is set as shown in FIG. When the magnetic tape 3 runs, the guide roller assembly 21 is also integrally rotated by the running force of the magnetic tape 3. Since the guide roller assembly 21 has the weight 26 attached thereto, This becomes a load when the tape 3 runs, and gives an equivalent mass to the magnetic tape 3. Therefore, loading guides 4A and 4B
Guide roller assembly 21 with weight 26 provided thereon
However, since the guide roller assembly and the impedance roller in the conventional device are also used, the impedance roller required in the conventional device can be omitted. As a result, the number of parts is reduced, the size and weight can be reduced, and the cost can be reduced. Further, by changing the shape and the like of the weight 26 of the guide roller assembly 21, the frequency band for reducing the jitter can be easily changed.

[0016]

As described above, according to the present invention, a magnetic recording reproducing apparatus according to the present invention, the guide row La dated c Eight, so can also serve as a guide roller and impedance roller, the impedance roller which has been required in the conventional apparatus At least it can be omitted, the number of parts can be reduced, the size and weight can be reduced, and the cost can be reduced. Also, changing the guide row notches Waits La, etc., it is possible to easily change the relief frequency bands of jitter, thereby improving the effect of reducing the jitter.

[Brief description of the drawings]

FIG. 1 is a layout diagram of a main part of a magnetic recording and reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic enlarged sectional view taken along the line AA of FIG.

FIG. 3 is a side view of a guide roller assembly alone shown with a pivot.

FIG. 4 is a bottom view of the guide roller assembly alone shown together with the pivot.

FIG. 5 is a longitudinal sectional view taken along the line BB in FIG. 4;

[Explanation of symbols]

 2 Cassette 3 Magnetic Tape 4A Tape Inlet Loading Guide 4B Tape Outlet Loading Guide 5 Drum 21 Guide Roller Assembly 26 Weight 28 Notch

Claims (1)

(57) [Claims] A rotating means for rotating the magnetic tape;
Guide roller with weight to guide the running of magnetic tape
In the magnetic recording / reproducing apparatus provided with, the weight is formed in a substantially donut shape, and
Orbits the notch extending radially toward the outer periphery
Characterized by being provided at equal intervals in a plurality of directions.
Raw equipment.