JPH06203431A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To suppress the wear of a reel base, to prevent stick slip and to stabilize tape traveling by forming a string in a tape tension adjusting mechanism with belt-like material and bringing the string into contact with a reel base slidably and planely. CONSTITUTION:The string 4 is formed in the belt-like shape of prescribed width by plate work in a tape tension adjusting mechanism 1 which is constituted so that the string 4 is pressed to the guiding groove of the reel base 2 and the tension of a magnetic tape T is held constant. Thus, the string 4 is slidably and planely brought into contact with the reel base 2 formed of synthetic resin, and the wear of the reel base 2 is decreased, and simultaneously, the coefficient of friction is increased, then the change of braking force preventing the stick slip is suppressed. Consequently, the traveling of the tape is stabilized for a long time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus such as a video tape recorder (VTR) having a tape tension adjusting mechanism.

[0002]

2. Description of the Related Art Generally, a video tape recorder (VT)
In the recording / reproducing apparatus such as R), in order to stably run the magnetic tape, it is necessary to run the magnetic tape with a proper tension applied, and yet,
The tension must be kept as constant as possible.

Particularly in a VTR or the like, it is an important condition that a magnetic tape is closely wound on the outer peripheral surface of the head drum when the information is recorded / reproduced, and the tape runs when the tape tension is not appropriate. In the case where there is a large fluctuation, the winding state of the magnetic tape around the head drum becomes unstable, and accurate recording / reproduction of information cannot be performed.

For this reason, a conventional tape player in which a magnetic tape such as a VTR is wound obliquely around a rotary head drum and runs, is provided with a tape tension adjusting mechanism for keeping the tape tension substantially constant.

For example, in a conventional tape tension adjusting mechanism 31, as shown in FIG. 5, a ten-legged pin 32 for suspending a magnetic tape T is erected on a ten-legged arm 33, and the ten-legged arm 33 is horizontally oriented around a supporting point 34. Rotatably mounted on the reel base 41, while the spring 35 applies a biasing force to the direction in which the tension pin 32 comes into contact with the magnetic tape T, while one end is fixed to the chassis side.
The other end of the steel wire string 36 wound around is fixed to a portion between the ten-legged pin 32 and the fulcrum shaft 34.

With this structure, when the tape tension is weakened, the tension arm 33 rotates about the fulcrum shaft 34 in the counterclockwise direction in FIG. 5, and by this rotation, the string 36 is pulled and pressed against the peripheral surface of the reel stand 41. It

When the tape tension increases, the tension arm 33 rotates clockwise around the fulcrum shaft 34 in FIG. 5, and this rotation loosens the pulling of the string 36 and loosens the pressure contact with the reel base 41. , The tape tension is adjusted.

In the recording / reproducing apparatus, a vertical fixed guide 42 for changing the traveling direction of the magnetic tape T is provided in the vicinity of the tape tension adjusting mechanism 31, and the head drum H is sandwiched so that the magnetic tape is magnetized substantially symmetrically. Fixed inclination guides 43 and 43 'for inclining the tape T are provided, and the magnetic tape T is wound obliquely around the head drum H, and a roller guide 44 for guiding the magnetic tape T to return it to a vertical state again. 44 ', roller guides 45, 45' and tilt guides 46, 46 'are provided and arranged on a moving base (not shown).

The magnetic tape T is sent from the fixed inclined guide 43 'through the capstan 47 and the moving guide 48 into the cassette C on the outlet side with respect to the head drum H so as to be wound up on the winding-side reel 49. Has become.

[0010]

In the conventional recording / reproducing apparatus having such a structure, in the tape tension adjusting mechanism, the string 36 is formed by a steel wire having a circular cross section, as shown in FIG. Since the reel base 41 is made of synthetic resin, its wear rate is proportional to the product PV of the winding pressure P of the string 36 on the reel base 41 and the rotation speed V of the reel base 41, but the string 36 has a circular cross section. Since the steel wire has a shape, it comes into line contact with the reel base 41, so that the PV value is very large, and as a result, the reel base 41 wears quickly.

Further, when the friction coefficient decreases as the relative speed between the string 36 and the reel base 41 increases, stick-slip occurs, the braking force fluctuates, and the tape tension fluctuates. was there.

Since the string 36 is formed of steel wire, in order to hold the string 36, that is, to fix the string 36 to the chassis leg 33, as shown in FIG. The metal fittings 37 and 38 are required, which leads to an increase in the number of parts of the tape tension adjusting mechanism 31. Further, since the steel wire string 36 and the mounting metal fittings 37 and 38 are joined by caulking or the like, the number of man-hours increases and the cost increases. Was the cause.

The present invention has been made in view of the above points, and in a recording / reproducing apparatus equipped with a tape tension adjusting mechanism using a string, reduces the wear rate of the reel base and makes stick-slip less likely to occur. Therefore, it is an object of the present invention to provide a recording / reproducing apparatus which can obtain a stable braking force on a reel stand, can stably run a magnetic tape, and can reduce the cost.

[0014]

In order to achieve the above object, a recording / reproducing apparatus of the present invention comprises a tape as a record carrier,
A reel base that supplies or winds the tape, a tension regulator arm that has a tape guide that elastically slides in contact with the tape at the time of traveling and that is rotatably supported by the chassis, and the tension regulator arm. In the vicinity of the shaft fulcrum, a string having one end locked and an intermediate part wound around a part of the peripheral surface of the reel stand and the other end locked at a predetermined portion of the chassis is provided. It is formed by a band-shaped material having a predetermined width.

Further, the strip-shaped material of the string in the present invention can be formed by sheet metal.

Further, it is preferable that the strings formed of the band-shaped material are integrally formed with stopper pieces at both ends.

Further, it is preferable that the stopper piece is formed substantially at right angles to the strip-shaped material string.

[0018]

In the recording / reproducing apparatus according to the present invention, since the string is formed of the strip-shaped material, the surface of the string comes into sliding contact with the reel stand, the sliding contact area becomes large, and the winding pressure is reduced. Wear rate can be reduced.

Further, since the string is formed by the strip-shaped sheet metal, it can withstand long-term use.

Further, by integrally forming the stopper pieces at both ends of the strip-shaped material string, the strings can be easily attached to the chassis side and the tension arm.

Further, by forming the stopper piece substantially at right angles to the strip-shaped material string, when the stopper piece is fixed to the chassis side and the ten-leg arm, the string surface is surely brought into sliding contact with the reel base.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tape tension adjusting mechanism applied to the apparatus of the present invention will be described below with reference to FIGS.

The tape tension adjusting mechanism 1 of this embodiment is a tension regulator arm (hereinafter referred to as "ten-leg arm") 3 which is positioned near the supply side reel base 2 and is pivotally supported by the chassis, and a chassis which is wound around the reel base 2. And a string 4 fixed to the balance leg arm 3.

A tape guide 5 is provided upright on the tip of the tension arm 3, and is rotatably supported on the chassis by a shaft pin 6 at a substantially central portion and is located between the shaft support and the tape guide 5. Then, a tension coil spring 7 having a predetermined tension elasticity is engaged with the tension coil spring 7 so as to be rotationally biased in one direction (counterclockwise in FIG. 1).

Further, the string 4 has stopper pieces 8 at both ends,
9 is integrally formed, and the stopper piece 8 on the one end side is fixed to the string block 10 installed on the chassis in the vicinity of the reel base 2 with the screw 11, and the reel base 2
The guide piece 2 is inserted into the guide groove 2a of the reel, and the stopper piece 9 on the other end side is fixedly attached to the tenregi arm 3 at a position near the tape guide 5 near the shaft fulcrum, and the reel base 2 is rotated by the rotational deviation of the tenreggi arm 3. The guide groove 2a is pressed against the inner peripheral surface of the guide groove 2a. A drive gear 13 of an adjusting driver 12 is meshed with the string block 10.

In this example, the string 4 is formed of a sheet metal into a band shape having a predetermined width, and the stopper pieces 8 and 9 are integrally formed horizontally at both ends of the band string 4.

The band-shaped string 4 and the stoppers 8 and 9 are integrally formed by first stamping the string 4 and the stoppers 8 and 9 at both ends with a sheet metal, for example, a thin stainless steel plate, and then the stopper 8 , 9 are bent substantially at right angles to the string 4 to be formed (see FIG. 4).

In the tape tension adjusting mechanism 1 using the string 4 formed as described above, the magnetic tape T drawn from the reel 14 which is integrally rotated coaxially with the supply side reel base 2 is the tape guide 5 of the ten leg arm 3. After being wound around, the tape is slidably contacted with the fixed guide 15 and pulled through a tape path substantially equivalent to the above-mentioned conventional example with a certain tension to be wound up on a winding side reel (not shown) at a constant speed. At this time, tape tension adjustment is performed on the magnetic tape T.

That is, the ten leg arm 3 is provided with the tape guide 5
Since the tension of the magnetic tape is received via the coil, the tension coil spring 7 also receives a force to rotate in the counterclockwise direction as shown in FIG. 1, and the string 4 is pulled by the difference between the two forces. The reel 14 is pressed against the inner peripheral surface of the guide groove 2a of the reel base 2 to prevent the reel 14 from rotating.

If the tension of the magnetic tape T is reduced, the force for rotating the balance arm 3 in the clockwise direction is reduced, so that the balance with the elasticity of the tension coil spring 7 is lost and the force for pulling the string 4 is lost. Will increase. Therefore, the force with which the string 4 is pressed against the reel base 2 increases, further attempts to hinder the rotation of the reel 14, and the magnetic tape T is pulled at a constant speed. As a result, the tension of the magnetic tape increases. . On the contrary, when the tension of the magnetic tape T is increased, the tension of the magnetic tape T is decreased by the operation reverse to the above operation.

By repeating the above operation, the tension of the magnetic tape T is always kept constant.

As described above, the string 4 is pressed against the reel base 2 to cause a problem such as abrasion of the reel base 2. In this example, however, the string 4 is formed in a band shape, and thus the reel base 2 is formed. There is a face-to-face contact with, thus reducing the wound pressure value and significantly reducing the wear rate.

The string 4 has stopper pieces 8 at both ends.
9 is formed integrally and substantially at a right angle to the sliding contact surface of the string 4, so that it can be easily attached to the chassis side, that is, the string block 10 and the ten leg arm 3, and the stopper pieces 8 and 9 can be easily attached. When the string 4 is fixedly attached, the sliding contact surface of the string 4 is surely brought into surface contact with the peripheral surface of the reel base 2, that is, the inner peripheral surface of the guide groove 2a, and is stably wound.

With the tape tension adjusting mechanism constructed as described above, the magnetic tape is always stably fed from the supply reel by a constant tape tension to be run, and recording / reproducing is surely performed.

Further, since the string 4 is integrally formed with the stopper pieces 8 and 9 by the sheet metal, the number of parts can be reduced and the man-hours can be reduced to reduce the cost.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the width of the string 4 and the shapes of the stopper pieces 8 and 9 can be arbitrarily changed.

Of course, the present invention is not limited to the rotary head type recording / reproducing apparatus, but can be applied to the fixed head type recording / reproducing apparatus.

[0038]

As described above, according to the present invention, the contact area of the string that is braked with respect to the reel stand is increased to stabilize the friction coefficient, and the friction coefficient is increased with the increase of the relative speed with the reel stand. As a result, stick-slip is less likely to occur, the braking force and tape tension are stable, the magnetic tape can always be run stably, and recording / reproducing is reliably performed, and reliability is improved.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a recording / reproducing apparatus according to the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 4 is a partially omitted plan view of an example of a string applied to the present invention.

FIG. 5 is a plan view of a conventional recording / reproducing apparatus.

FIG. 6 is a cross-sectional view showing a contact state between a conventional string and a reel stand.

FIG. 7 is a plan view in which a part of a conventional string is omitted.

[Explanation of symbols]

 1 Tape tension adjusting mechanism 2 Reel stand 3 Tension regulator arm 4 String 5 Tape guide 8, 9 Stopping piece T Magnetic tape

Claims (4)

[Claims] 1. A tape, which is a record carrier, a reel base for supplying or winding the tape, and a tape guide, which is elastically brought into sliding contact with the tape when the tape is running, at one end thereof, and is rotatable about a chassis. An axially supported tension regulator arm, one end of which is locked near the pivotal fulcrum of the tension regulator arm, an intermediate portion of which is wound around a part of the peripheral surface of the reel stand, and the other end of which is a predetermined portion of the chassis. And a string locked to the recording medium, wherein the string is formed of a band-shaped material having a predetermined width. 2. The recording / reproducing apparatus according to claim 1, wherein the strip-shaped material forming the string is a sheet metal. 3. The recording / reproducing apparatus according to claim 1, wherein stop pieces are integrally formed at both ends of the string formed of the band-shaped material. 4. The recording / reproducing apparatus according to claim 3, wherein the stopper is formed substantially at a right angle to the strip-shaped material string.