JPH04109453A - Tape guiding mechanism in magnetic recording/ reproducing device - Google Patents

Abstract

PURPOSE:To realize stable tape travel by positioning rotary guides so that a part of a magnetic tape whose tension becomes below a prescribed value is brought into contact with the flange of the rotary guide of the other side when the tension of the part guided by the rotary guide and a non-rotary guide of one side becomes below the prescribed value. CONSTITUTION:A tape guiding mechanism is constituted so that the flanges 7c, 7d of the rotary guide 7 at a cylinder inlet side and the flanges 9c, 9d of the rotary guide 9 at a cylinder outlet side overlap each other. Accordingly, the inlet side part 1a of the magnetic tape 1 stretched between the non-rotary guide 6 and the rotary guide 7 at the cylinder inlet side and the outlet side part 1b of the magnetic tape 1 stretched between the non-rotary guide 8 and the rotary guide 9 at the cylinder outlet side are prevented from coming into contact with each other. Thus, the stable tape travel can be realized.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to a magnetic recording/reproducing device in which a magnetic tape is wound around a cylinder over a wide angle, in order to prevent contact between an input side portion and an output side portion of the magnetic tape. The present invention also relates to a tape guide mechanism suitable for achieving stable tape running.

[Prior Art] Conventionally, rotary head type magnetic recording and reproducing devices (hereinafter sometimes referred to as VTRs), especially VTRs with integrated cameras,
In response to the demand for smaller and lighter equipment, in order to achieve recording and playback compatibility (same formant) with conventional equipment,
A system has been proposed in which the magnetic tape is wound around a cylinder by increasing the corners to reduce the diameter of the cylinder. For example, a small diameter cylinder system for a β-type VTR is disclosed in Japanese Patent Laid-Open No. 101.579/1983.

This is a one-head system adopted to reduce the diameter of the cylinder, and in order to have the same format as the conventional two-head system, the winding around the cylinder was 1800mm, but the corners were rounded. 300" wide angle winding.

In this case, the cylinder rotates at 60 revolutions per second, so the vertical scanning speed of the camera remains unchanged, but the horizontal scanning speed is effective for a period of 360° because the angle of tape wrapping around the cylinder is small at 300°/360'. The scan must be completed. Therefore, the signal is compressed in time by about 20% in the horizontal direction and recorded.

Recently, due to the increasing demand for camera-integrated VTRs, devices are becoming increasingly smaller and lighter.Coupled with the trend toward lower costs due to the rapid progress in memory development, the small diameter cylinder system of the β method described above is becoming increasingly smaller and lighter. In contrast, a small-diameter cylinder system capable of recording and reproducing, which is equipped with a dedicated memory for compressing and expanding the horizontal scanning speed, has been proposed.

[Problems to be Solved by the Invention] In the above system, in order to reduce the number of memories as much as possible to reduce costs, and to reduce the diameter of the cylinder as much as possible to achieve a compact and lightweight device, it is necessary to use a tape guide. The mechanism requires that the magnetic tape be wrapped around the cylinder as close to 360 degrees as possible. However, in this case, when the loading operation is completed (loading completed state), the guides near the entrance and exit sides of the cylinder are arranged close to each other as a tape guide mechanism.

Conventional magnetic recording and reproducing devices (V
TR) will be explained using FIGS. 5 and 6.

FIG. 5 is a plan view showing a conventional magnetic recording/reproducing device, and FIG. 6 is an enlarged view showing the tape guide mechanism in FIG. 5, both of which are in a state where the loading operation has been completed (loading completed state). It shows.

In each figure, ■ is a magnetic tape wound between a supply reel 3 and a take-up reel 4 included in a cassette 2. Since the magnetic tape 1 is wound around the cylinder 5 over an angle of 300° or more, when the loading is completed, the entrance side portion 1a of the magnetic tape 1 that is passed from the non-rotating guide 6 arranged on the cylinder entrance side to the rotating guide 7 and,
The exit side portion 1b of the magnetic tape 1 extending from the non-rotating guide 8 to the rotating guide 9 on the cylinder exit side is located very close to each other.

In this loading completion state, if the magnetic tape l is in the stop mode, the tension of the magnetic tape 1 is released and the magnetic tape 1 is in a slack state, so that the inlet part 1a and the outlet part 1b of the magnetic tape 1 come into contact with each other. The problem arises that they get hurt.

In addition, even under normal running conditions with a predetermined tension applied, the magnetic tape may
When the tension distribution in the width direction of the magnetic tape 1 becomes uneven, the magnetic tape 1 runs with the end portions in the width direction slackened, and therefore, as in the case of the stop mode, the entrance side portion 1a of the magnetic tape 1 A problem arises in that the input side portion 1a and the output side portion 1b of the magnetic tape 1 come into contact with each other, and it has been desired to prevent such contact between the input side portion 1a and the output side portion 1b of the magnetic tape 1.

The purpose of the present invention is to solve the problems of the prior art described above,
To provide a tape guide mechanism that enables stable tape running by preventing contact between the entrance and exit parts of a magnetic tape wound around a cylinder at a wide angle.

[Means to solve the problem]

In order to achieve the above-mentioned object, in the present invention, when the tension in the portion of the magnetic tape guided by one of the rotating guides and the non-rotating guide becomes less than a predetermined value in the loading completion state, Both rotary guides were positioned so that that portion contacted the flange of the other rotary guide.

(Function) According to the present invention, even if the tension is loosened and the magnetic tape is in a slack state in the stop mode, the guide setting can be performed in the normal running state such as during recording or playback. Even if the tension distribution of the magnetic tape becomes uneven due to variations and the magnetic tape runs with the ends loosened, the portion of the magnetic tape that is guided by the rotating guide and the non-rotating guide is By contacting the flange of the rotation guide, displacement of the magnetic tape in the thickness direction is suppressed, so that it does not come into contact with other parts of the magnetic tape.

〔Example〕

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

FIG. 1(a) is a plan view showing a tape guide mechanism as an embodiment of the present invention, and FIG. 1(b) is a plan view showing the tape guide mechanism as an embodiment of the present invention.
2 is a plan view showing a magnetic recording/reproducing apparatus having the tape guide mechanism of FIG. 1, and FIG. 3 is a perspective view of the magnetic recording/reproducing apparatus shown in FIG. 2.

These FIGS. 1, 2, and 3 all show a state in which the loading operation has been completed (loading completion state).

That is, in FIG. 2, when the cassette 2 is pushed into a cassette holder (not shown) and the holder is manually closed, the cassette 2 slides from the position shown by the broken line to the position shown by the solid line. As each guide moves along the loading path indicated by the arrow, the magnetic tape 1 in the cassette 2 is pulled out and wrapped around the cylinder 5 over a wide angle of just under 360 degrees, completing the loading operation. It is.

In FIGS. 2 and 3, 10 is a rotating guide for forming a tape bus on the entrance side of the cylinder, 11 is an inclined guide, 12 is a rotating guide, and 13 is a guide. Also, 14
1 is an inclined guide for forming a tape bus on the exit side of the cylinder, 15 is a rotation guide, 16 is a capstan, 17 is a pinch roller, 18 is a rotation guide, and 19 is a mechanical chassis.

Further, 20 is a tape guide mechanism according to the present invention,
It is composed of a non-rotating guide 6 and a rotating guide 7 on the cylinder entry side, and a non-rotating guide 8 and a rotating guide 9 on the cylinder exit side.

By the way, in the loading completion state, the configuration shown in FIG. 2 is different from the configuration shown in FIG.
0 is asymmetrical with respect to the straight line y, and the tape guide mechanism 20
The difference is that the entire structure is placed around the cylinder entry side.

That is, in the conventional tape guide mechanism shown in FIG.
With respect to a straight line y passing through the origin O of the cylinder 5 and perpendicular to the straight line X connecting the supply side reel center 3' and the take-up side reel center 4', In contrast to the non-rotating guide 84 and the rotating guide 9 on the exit side, which are closed almost symmetrically, in the tape guide mechanism shown in FIG. They are moved and arranged asymmetrically with respect to the same straight line y.

With such a configuration, the depth dimension of the mechanical chassis 19 can be reduced by $i (DI<DZ), and the mechanism can be significantly downsized.

Next, the tape guide mechanism 20 will be explained in more detail with reference to FIG.

In FIG. 1, the rotating guide 7 on the cylinder entry side is connected to the guide base (
The rotary guide 9 on the cylinder outlet side is also integrally attached to another guide base (not shown) together with the non-rotating guide 6 on the cylinder outlet side.

Here, the rotation guide 7 on the cylinder entry side has a shaft 7a.
A guide roller 7b rotatable around and a shaft 7a
The rotary guide 9 on the cylinder outlet side includes a guide roller 9b rotatable around the shaft 9a, and flanges press-fitted on the top and bottom of the shaft 9a. It consists of 9c and 9d.

In addition, in the loading completion state, the rotation guide 7 on the cylinder entry side and the rotation guide 9 on the cylinder exit side are connected to the first rotation guide 7.
As shown in Figure (b), the annular space is arranged close to each other on different levels and is formed by the outer diameter of the flanges 7c and 7d of the rotation guide 7 on the cylinder entry side and the outer diameter of the guide roller 7b. (Shaded area) The upper flange 9C of the rotation guide 9 on the cylinder exit side enters into the inside 21, and the annular shape is formed by the outer diameter of the flanges 9c and 9d of the rotation guide 9 on the cylinder exit side and the outer diameter of the guide roller 9b. Space (shaded area) 22
The lower flange 7d of the rotation guide 7 on the cylinder entry side is arranged so as to fit therein. That is, the rotation guide 7 on the cylinder entry side and the rotation guide 9 on the cylinder exit side are arranged so that their flanges partially overlap each other in the radial direction.

Now, in such a loading complete state, recording,
When the playback switch (not shown) is pressed and the magnetic tape 1 is run, tape slack may occur due to uneven tape tension distribution as described above, or tape slack may occur due to the tension relaxation state in the stop mode. However, in this embodiment, as shown in FIG.
and the flange 9C19d of the rotation guide 9 on the cylinder exit side.
Since the structure is configured such that the two overlap, the entrance side portion 1a of the magnetic tape 1 stretched between the non-rotating guide 6 and the rotating guide 7 on the cylinder entrance side, and the non-rotating guide 8 on the cylinder exit side. Magnetic tape 1 stretched between rotating guide 9
It is possible to prevent contact between the outlet portion 1b and the outlet portion 1b.

That is, for example, the entrance side portion 1 of the magnetic tape 10 stretched between the non-rotating guide rod and the rotating guide 7 on the cylinder entrance side.
Even if the magnetic tape 1 is loosened as shown by the dotted line 1a' in FIG. ', it is possible to prevent the magnetic tape 1 from loosening in the direction toward the cylinder exit side, and conversely, the exit side portion 1b of the magnetic tape 1 stretched between the non-rotating guide 8 and the rotating guide 9 on the cylinder exit side is Even when the magnetic tape 1 is loosened as shown by the dotted line 1b' in a), the exit side portion 1b of the magnetic tape 1 comes into contact with the lower flange 7d of the rotation guide 7 on the cylinder entry side. This prevents it from loosening. Therefore, the input side portion 1a and the output side portion 1b of the magnetic tape 1 do not come into contact with each other and are not damaged.

Next, another embodiment of the present invention will be described using FIG. 4.

FIG. 4(a) is a plan view showing a tape guide mechanism as another embodiment of the present invention, and FIG. 4(b) is a plan view showing the tape guide mechanism as another embodiment of the present invention.
-A sectional view showing a cross section in the Y direction, and both of them show a state in which the loading operation has been completed (loading completion status B).

The basic configuration of this embodiment is the same as that of the embodiment shown in FIG. 1 described above, so the same parts are given the same reference numerals.

Here, the difference between this embodiment and the embodiment shown in FIG.
The illustrated embodiment is the flanges 7c and 7d of the rotation guide 7 on the cylinder entry side and the flange 9 of the rotation guide 9 on the cylinder exit side.
c and 9d, whereas in this embodiment, the flanges 7c and 9d of the rotation guide 7 on the cylinder entry side overlap.
7d and flanges 9c, 9 of the rotation guide 9 on the cylinder exit side.
cl and the cylinder inlet side so that the edges of flanges 7c and 7d are in contact with the edges of flanges 9c and 9d when viewed from above, as shown in FIG. 4(a). The point is that the rotation guide 7 and the rotation guide 9 on the cylinder exit side are arranged.

Therefore, even with such a configuration, the entrance side portion 1a of the magnetic tape 10 stretched between the non-rotating guide 6 and the rotating guide 7 on the cylinder entrance side is at point I#11a' in FIG. 4(a). If the magnetic tape becomes loose, the 10-person side part 1 of the magnetic tape
a comes into contact with the upper flange 9C of the rotating guide 9 on the cylinder exit side, so there is no slack in the cylinder exit direction from the dotted line la', and on the contrary, the non-rotating guide 8 on the cylinder exit side
If the output side portion 1b of the magnetic tape 1 stretched between the magnetic tape 1 and the rotating guide 9 becomes slack as shown by the dotted line 1b' in FIG. 4(a), the output side portion 1b of the magnetic tape 1 , comes into contact with the lower flange 7d of the rotation guide 7 on the cylinder entry side, so
There is no loosening in the cylinder entry direction from the dotted line 1b',
Similar to the embodiment shown in FIG. 1 described above, it is possible to prevent the input side portion 1a and the output side portion 1b of the magnetic tape 10 from coming into contact with each other.

In addition, in FIG. 4(a), the entrance side portion 1a of the magnetic tape 1
Although it appears that the magnetic tape 1 and the output portion 1b are in contact with each other, in reality, as shown in FIG. Since the middle part swells, the entrance part 1a and the lower flange 7d of the rotation guide 7 are in contact with the upper flange 9C of the rotation guide 9.
The outlet portions 1b that are in contact with each other do not come into contact with each other.

[Effects of the Invention] As described above, according to the present invention, in order to achieve compatibility with conventional devices and to reduce the size and weight of the device,
In a system with a small cylinder diameter, even if the tension is loosened and the magnetic tape becomes slack in stop mode, or in normal running conditions,
Due to variations in the guide settings, the tension distribution of the magnetic tape becomes uneven, and even if the magnetic tape runs with the edges slack, the magnetic tape's entrance and exit parts (rotating guide and non-rotating guide) (the part guided by)
By contacting the flanges of other rotating guides, the displacement of the magnetic tape in the thickness direction is suppressed, so contact between the entrance and exit parts of the magnetic tape can be prevented, and therefore Since stable tape running is possible, a magnetic recording/reproducing device with high reliability can be realized.

[Brief explanation of drawings]

FIG. 1(a) is a plan view showing a tape guide mechanism as an embodiment of the present invention, and FIG. 1(b) is a plan view showing the tape guide mechanism as an embodiment of the present invention.
2 is a plan view showing the magnetic recording/reproducing device having the tape guide mechanism shown in FIG. 1; FIG. 3 is a perspective view showing the magnetic recording/reproducing device shown in FIG. 2; FIG. (a
) is a plan view showing a tape guide mechanism as another embodiment of the present invention, FIG. 4(b) is a sectional view showing a cross section in the Y-X direction of FIG. 4(a), and FIG. FIG. 6 is a plan view showing the recording/reproducing apparatus, and FIG. 6 is an enlarged view showing the tape guide mechanism of FIG. 5. Explanation of symbols 1... Magnetic tape, 1a... Inlet side part of magnetic tape, 1b... Outlet side part of magnetic tape, 5... Cylinder, 6... Non-rotating guide (cylinder inlet side) , 7... Rotating guide (cylinder entry side), 7c, 7d... Flange, 8... Non-rotating guide (cylinder exit side), 9... Rotating guide (cylinder exit side), 9c, 9d. ...Flange, 20...Tape guide mechanism. Agent Patent Attorney Akio Namiki 1, September 27, 2018

Claims (1)

[Claims] 1. Guide rollers (7b, 9b) rotatable around rotating shafts (7a, 9a) and flanges (7c, 7d, 9c, 9d) disposed at the upper and lower ends of the guide rollers. The first consisting of
and a second rotating guide (7, 9), and first and second non-rotating guides (6, 8), wherein the first rotating guide (7) is connected to the first non-rotating guide. Together with the rotation guide (6), the second rotation guide (9)
The magnetic tape (1) wound on the supply reel (3) and the take-up reel (4) in the cassette (2) is moved with the non-rotating guide (8) of the magnetic tape (1).
) is pulled out from the cassette and wrapped around the cylinder (5) in which the rotating magnetic head is mounted over a length of 300° or more, and then the first rotating guide (7) is connected to the first non-rotating guide (7). Together with the guide (6), on the entry side of the magnetic tape (1) in the vicinity of the cylinder (5), the second rotating guide (9) together with the second non-rotating guide (8) 5) the magnetic tape (1) in the vicinity of
are positioned on the exit side of the magnetic tape (
1) in a tape guide mechanism in a magnetic recording and reproducing apparatus that guides a magnetic tape (1), when positioning the first and second rotation guides (7, 9), the first rotation guide (7) on the magnetic tape (1) ) and the first non-rotating guide (6) becomes less than a predetermined value, the part (1a) is guided by the second rotating guide (9). The magnetic tape (1) is in contact with the flange of the magnetic tape (1).
, the portion (1) guided by the second rotating guide (9) and the second non-rotating guide (8)
When the tension in b) becomes less than a predetermined value, that part (
1b) in contact with the flange of the first rotation guide (7).
A tape guide mechanism in a magnetic recording/reproducing device, characterized in that the tape guide mechanism positions each of the tape guides. 2. In the tape guide mechanism according to claim 1, when positioning the first and second rotation guides (7, 9), the flange of the first rotation guide (7) and the second rotation guide (9) A tape guide mechanism in a magnetic recording/reproducing apparatus, characterized in that the first and second rotation guides (7, 9) are each positioned so that the flanges overlap each other in the radial direction.