JPH0355898B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing apparatus designed to reduce the winding angle of a magnetic tape around inclined poles arranged at the entrance and exit sides of a rotating cylinder.

In a magnetic recording and reproducing apparatus such as a video tape recorder (VTR), signals are recorded and reproduced using a so-called video cassette, which is a magnetic tape in the form of a cassette tape that is previously wound around a cassette. In this case, after the video cassette is installed in a predetermined position within the VTR, the magnetic tape is pulled out from the cassette by the action of the loading mechanism and wound at an angle around the circumferential surface of a rotating cylinder that has a magnetic head around it. , the recording and reproduction of video signals and audio signals are performed using a magnetic head.

1a and 1b are a perspective view and a sectional view showing the external appearance of a video cassette, in which a magnetic tape 1 is attached to a cassette 2.
Supply shafts 3 provided so as to be parallel to each other within the
The cassette is wound at the same height around the take-up shaft 3B, and when installed in a VTR, the surfaces 2A and 2B of the cassette serve as the chassis surface to which the various parts that make up the VTR are attached. It is designed to be parallel to the When the chassis surface is used as the reference surface for a VTR, the supply shaft 3
The directions of A and the winding shaft 3B are perpendicular to the reference plane thereof, and can therefore be referred to as a so-called reference axis.

Therefore, as described above, winding the magnetic tape 1 around the circumferential surface of the rotating cylinder at an angle means feeding the magnetic tape to the rotating cylinder at an angle with respect to the reference axis.

A method of pulling out a magnetic tape from a video cassette and supplying it to a rotating cylinder.The so-called magnetic tape loading method is as shown in Figure 2.
VHS method (M loading method) or third
A β method (U loading method) as shown in the figure is known. In FIGS. 2 and 3, 4 is a rotating cylinder, 5 is a loading pole on the supply side, and a vertical pole (guide roller) 5A is provided to be parallel to the reference axis, and an incline is provided to be inclined from the vertical pole (guide roller) 5A. Pole (fixed pole) 5
6 is a loading pole on the winding side, which includes a vertical pole 6A and an inclined pole 6B similar to the above.
It consists of

7 is a combination head consisting of an audio oil erase head 8 and an audio head 9 integrated; 10 is a capstan; 11 is a combination head;
is a pinch roller, 12 is an inclined roller, 13,1
4 and 15 are inclined poles, and 16A and 16B are impedance rollers (vertical rollers).

In FIG. 2, the magnetic tape 1 pulled out from the cassette by the supply-side loading pole 5 and the take-up-side loading pole 6 is placed on the circumferential surface of the rotating cylinder 4, which is provided at an angle to the reference axis. Although it is wound at an angle in the circumferential direction, the tilted pole 5 is pulled out from the cassette parallel to the reference axis and guided by the vertical pole 5A.
By wrapping around the circumference of B, it is tilted from the reference axis (parallel to the circumferential surface of the rotary cylinder 4) and is supplied to the inlet side. The magnetic tape 1 that has traveled more than half a circumference around the circumferential surface of the rotary cylinder 4 in this manner winds around the circumferential surface of the inclined pole 6B on the take-up side, which is provided symmetrically to the inclined pole 5B on the exit side. After returning to the state parallel to the reference axis again, it is guided by the vertical pole 6A and runs forward.

In addition, in FIG. 3, the magnetic tape 1 pulled out from the cassette parallel to the reference axis is fed as it is to the inlet side of the rotary cylinder 4, and is wound around the circumferential surface of the cylinder 4 to be tilted and run for more than half a circle. After that, it is taken out from the exit side. After being guided by an inclined roller 12 that is perpendicular (parallel) to the magnetic tape 1 running in an inclined state, the inclined pole 13,
By passing through steps 14 and 15, it is brought into a forward-dimensional parallel state and travels forward.

Here, the inclined roller 12 and the inclined pole 1
3, 14, and 15 are fixed on a rotating ring (not shown) provided to surround the rotating cylinder 4, and when the video cassette is inserted into the VTR, the rotating ring automatically rotates counterclockwise. The magnetic tape 1 is pulled out from the cassette and wound around the circumferential surface of the rotary cylinder 4 by rotation.

Comparing the above two types, the one shown in Fig. 2 does not use a rotating ring unlike the one shown in Fig. 3, which is advantageous in terms of space and has the advantage that it can be made smaller. However, on the other hand, a tilting pole is provided to tilt the running direction of the magnetic tape so that it is parallel to the circumferential surface of the rotating cylinder, and this tilting pole is fixed and rotates like a roller. Since they were not in contact, it was inevitable that the difference in the coefficient of friction between the inlet and outlet would become large. This has resulted in drawbacks such as an unnecessarily increased load on the magnetic tape drive system.

The present invention was made in response to the above problems, and includes a rotating cylinder having a magnetic head around it,
and inclined poles disposed on the magnetic tape inlet side and the outlet side of the rotary cylinder, respectively, in order to obliquely wind and take out the magnetic tape on the circumferential surface of the rotary cylinder, A magnetic recording and reproducing device is provided which eliminates the conventional drawbacks by reducing the winding angle of the magnetic tape around the tilted poles by providing guide rollers for guiding the magnetic tape at the inner positions of the tilted poles. The purpose is to provide

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a schematic top view showing a magnetic recording/reproducing apparatus according to an embodiment of the present invention, in which reference numeral 21 denotes a supply side rotating pole consisting of a vertical pole 21A and an inclined pole 21B, and 22 a winding side consisting of a vertical pole 22A and an inclined pole 22B. side loading pole,
Guide rollers 23 and 24 are provided at positions inside the inclined poles 21B and 22B on the magnetic tape inlet and outlet sides of the rotary cylinder 4, respectively.

The guide rollers 23 and 24 are the inclined poles 21
It is arranged perpendicular to the running direction of the magnetic tape 1 that has run through B or the rotating cylinder 4, and serves to guide the magnetic tape 1 so that it is parallel to the circumferential surface of the rotating cylinder 4. do.

Before that, the magnetic tape 1, which had been guided in a parallel state by the vertical pole 21A, is wound around the circumferential surface of the inclined pole 21B, thereby being brought into an inclined state and guided by the guide roller 23.

On the exit side of the rotary cylinder 4, the magnetic tape 1 is guided by a guide roller 24, wound around an inclined pole 22B, and brought into a parallel state again, and guided by a vertical pole 22A.

By arranging the guide rollers 23 and 24 on the inlet and outlet sides of the rotary cylinder 4 as described above, the winding angle of the magnetic tape 1 around the inclined poles 21B and 22B provided on the outside of these guide rollers 23 and 24 can be adjusted as compared to the conventional one. It can be reduced by 20° to 30°, which was previously set at approximately 58°.
can be reduced to a range of Therefore, the difference in the coefficient of friction with respect to the magnetic tape 1 between the entrance and exit of the inclined poles 21B and 22B can be reduced accordingly. This makes it possible to reduce the tension applied to the magnetic tape 1, thereby reducing the load on the magnetic tape drive system.

FIG. 5 shows another embodiment of the present invention, in which the same parts as in FIG. 4 are designated by the same numbers, and in FIG. On the contrary, the inclined pole 2 is placed in contact with the magnetic material side (surface side) of the magnetic tape 1.
This shows an example in which 1B and 22B are arranged. FIG. 6 is a top view showing the specific configuration of FIG. 5. The same parts as in FIG. The pole 22A and the guide roller 24 are fixed on a leader 26, and these leaders 25 and 26 are provided with grooves 27 and 24, respectively.
It is configured to be able to move up and down within 28. On the other hand, both the supply side inclined pole 21B and the take-up side inclined pole 22B are fixed on the chassis 29. When unloading the magnetic tape 1, the supply side leader 25 and the take-up side leader 2
6 are both placed in the cassette 2 as shown by dotted lines.

When a recording operation or a playback operation is performed in the above configuration, the leaders 25 and 26 are moved to the groove 2, respectively.
7, 28 in the vertical direction, and at this time, the supply side vertical pole 21A and the guide roller 23 as well as the take-up vertical pole 22A and the guide roller 24 pull out the magnetic tape 1 from the inside of the cassette 2 and apply it to the circumferential surface of the rotating cylinder 4. The rotating operation is performed by guiding the magnetic tape 1 at a predetermined inclination together with the supply side inclined pole 21B and the take-up side inclined pole 22B on the inlet side and outlet side. .

During such a rotating operation, if the supply side inclined pole 21B and the take-up side inclined pole 22B are arranged so as to be in contact with the surface side of the magnetic tape 1 as in this embodiment, both poles 21B and 22B are placed on the chassis 29. Since it can be fixedly provided, stable loading operation can be performed.

As is clear from the above explanation, according to the present invention,
In order to obliquely wind the magnetic tape around the circumferential surface of the rotary cylinder and take it out, guide rollers for guiding the magnetic tape are provided at inner positions of inclined poles respectively arranged on the inlet side and the outlet side of the rotary cylinder. Since it is composed of
Since the winding angle of the magnetic tape around the inclined pole can be reduced, the conventional drawbacks can be eliminated.

[Brief explanation of drawings]

FIGS. 1a and 1b are perspective views and sectional views for explaining the present invention, FIGS. 2 and 3 are top schematic views showing conventional examples, and FIGS. 4, 5, and 6 are 2A and 2B are a schematic top view and a top view, respectively, showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Magnetic tape, 2... Cassette, 4... Rotating cylinder, 21... Supply side loading pole, 22... Winding side loading pole, 21
A, 22A... Vertical pole, 21B, 22B...
Inclined pole, 23, 24...Guide roller, 2
5, 26... Leader, 27, 28... Groove, 29
...Siyashi.

Claims (1)

[Claims] 1. A rotating cylinder having a magnetic head around it;
and inclined poles disposed on the magnetic tape inlet side and the outlet side of the rotary cylinder, respectively, in order to obliquely wind and take out the magnetic tape on the circumferential surface of the rotary cylinder, A magnetic recording/reproducing device characterized in that guide rollers for guiding a magnetic tape are provided inside each of the inclined poles. 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the guide rollers are provided perpendicularly to the running direction of the magnetic tape at the entrance and exit sides of the rotating cylinder.