JPH07307046A - Tape driving device - Google Patents

Abstract

PURPOSE:To reduce the driving load on a tape-like medium and to stably travel the tape-like medium. CONSTITUTION:The tape driving device is provided with a pinch roller having a bearing part 20a and a base body part 20b, which are integrally molded of a rigid synthetic resin material, and an outer circumferential part 21 formed of an elastic synthetic resin material is fixed to the outer circumferential side of the base body part 20b of this pinch roller. Then, a gap is provided between the outer diameter of a supporting shaft 4 and the inner diameter of the bearing part 20a. Then, the tape driving device is fixed to the outer circumferential part formed of the elastic synthetic resin material only in an upper end part and a lower end part of the base body part of the pinch roller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape drive device used in a tape recorder, a VTR or the like for recording and reproducing using a tape medium.

[0002]

2. Description of the Related Art In recent years, tape recorders, camera-integrated VTRs, etc. have been required to reduce power consumption and to be used for a long time, and to make the main body of the apparatus smaller and lighter. Therefore, the structure of the tape drive apparatus is improved.・ Power saving is an important factor.

A conventional tape drive device will be described below. FIG. 7 is a sectional view of a main part of a tape drive device used in a conventional camera-integrated VTR or the like.

In FIG. 7, 1 is a rotationally driven capstan, 2 is an outer peripheral portion of a pinch roller formed of a rubber member, 3 is an intermediate member for supporting the outer peripheral portion 2 from the inner surface,
Reference numeral 4 is a support shaft for the pinch roller, 5 is a bearing portion that allows the intermediate member 3 to rotate about the support shaft 4, 6 is a ball bearing, and 7 is a sleeve for preventing the bearing portion 5 from coming off, and is press-fitted into the intermediate member 3. Has been done. Reference numeral 8 is a tape-shaped medium used for recording and reproduction.

The operation of the conventional tape drive device constructed as described above will be described.

The tape-shaped medium 8 is transported at a predetermined speed by the rotatably driven capstan 1 and the outer peripheral portion 2 of the pinch roller which is pressed against the capstan 1 via the tape-shaped medium 8.

A ball bearing 6 is used for the bearing portion 5 in order to smooth the rotation of the pinch roller.

Further, in order for the tape-shaped medium 8 to travel stably, the outer peripheral portion 2 must be uniformly pressed against the capstan 1, but the support shaft 4 is slightly inclined with respect to the capstan 1 in manufacturing. Therefore, it is difficult to make the support shaft 4 and the capstan 1 completely parallel.

Therefore, in the above conventional tape drive device,
Using the slight play of the ball bearing 6, the outer peripheral portion 2
Is slightly inclined with respect to the support shaft 4 so that the outer peripheral portion 2 and the capstan 1 are parallel to each other, and the outer peripheral portion 2 is evenly pressed to ensure stable running of the tape medium 8.

However, when the outer peripheral portion 2 is formed of rubber as in the conventional case, the deformation loss of the rubber becomes large when the outer peripheral portion 2 is pressure-bonded to the capstan 1, and the pinch roller load increases, so that the tape driving force decreases. , And Capstan 1
There is a problem in that the torque and power consumption of the motor that rotates the motor increases. Further, since the pinch roller requires the intermediate member 3 for holding rubber between the pinch roller bearing portion 5 and the pinch roller outer peripheral portion 2, it is difficult to reduce the size and weight of the pinch roller, and consequently the magnetic recording. There is also a problem that it hinders the reduction in size and weight of the playback device.

Further, the rubber is apt to deteriorate, and the tape is not normally transferred due to the deterioration of the rubber due to long-term use, and the processing of the rubber is difficult, so that the tape drive device is also manufactured. There was a problem that became difficult.

Further, in the above-mentioned conventional tape drive device, since the outer peripheral portion 2 of the pinch roller is pressed uniformly against the capstan 1, the slight backlash of the bearing portion 5 and the ball bearing 6 is utilized. According to another method, the support shaft 4
The inclination angle of the outer peripheral portion 2 with respect to the outer peripheral portion 2 is small, and it is difficult to keep the outer peripheral portion 2 and the capstan 1 completely parallel to each other. Further, the use of the ball bearing 6 has a complicated structure and a large number of parts, which leads to manufacturing and cost aspects. Was not preferred.

Therefore, it is possible to eliminate the decrease in the tape driving force due to the deformation loss of the rubber and the increase in the power consumption due to the torque load of the capstan motor in the above-described conventional tape driving device, and to simplify the outer peripheral portion 2 and the capstan 1 with a simple structure. Japanese Patent Laid-Open No. 159419/1993 discloses a tape drive device capable of keeping the tape completely parallel.

The structure of the tape drive device disclosed in JP-A-5-159419 will be described below.

FIG. 8 is a sectional view of the main part of the tape drive device. In FIG. 8, 4 is a pinch roller support shaft, and 10 is a pinch roller bearing portion 10a and outer peripheral portion 1 made of a rigid synthetic resin member having a hardness higher than rubber.
0b is a rigid synthetic resin member of a pinch roller integrally formed with 0b, and 9 is a retaining member of the base portion 10.

The operation of the tape drive device constructed as above will be described. The rigid synthetic resin member 10 is rotatable around the support shaft 4, and is transferred to the tape-shaped medium by being pressed against the capstan via the tape-shaped medium.

The outer peripheral portion 10b of the pinch roller, which is in direct contact with the tape-shaped medium when the tape-shaped medium is transported, is formed of a rigid synthetic resin having a hardness higher than that of the rubber member, and therefore, even when the pinch roller is pressed against the capstan. Since the deformation of the outer peripheral portion 10b is small and the pinch roller load can be reduced, the tape driving force can be improved and the power consumption of the motor for rotating the capstan can be reduced.

Further, in the known tape driving device of FIG. 8, the inner diameter of the bearing portion 10a of the rigid synthetic resin member 10 is pinched in order to keep the outer periphery 10b of the pinch roller and the capstan parallel to each other and to ensure stable running of the tape. The outer diameter of the support shaft 4 of the roller is slightly larger than the outer diameter of the pinch roller 10b.
The inclination angle of b is large, the stable running of the tape can be achieved with a simple structure, and the bearing portion 10a is integrally formed with the outer peripheral portion 10b, so that the manufacturing is facilitated and the pinch roller can be reduced in size and weight. It is a thing.

[0019]

However, JP-A-5-1 is used.
The tape drive device disclosed in No. 59419 still has the following problems in spite of the above-mentioned various advantages which conventional tape drive devices do not have.

That is, in the above tape drive device, the bearing portion 1 of the pinch roller is made of a rigid synthetic resin material having high hardness.
0a and the outer peripheral portion 10b are integrally molded, but the rigidity synthetic resin material is such that the bearing portion 10a withstands friction with the support shaft 4 of the pinch roller and can smoothly rotate the pinch roller. Therefore, it is necessary to use a synthetic resin having a considerable hardness.

However, if a synthetic resin having a hardness higher than necessary is used for the outer peripheral portion 10b, the frictional force due to the pressure contact with the capstan becomes small, the tape-shaped medium is not smoothly transferred, and the tape is stably run. There is a problem that there is no.

In the above tape drive device, the bearing portion of the pinch roller is made of a rigid synthetic resin material instead of the conventional ball bearing, and the inner diameter of the bearing portion 10a is slightly larger than the outer diameter of the support shaft 4 of the pinch roller. By using the gap formed between the bearing portion 10a and the support shaft 4,
The outer peripheral portion 10b of the pinch roller and the rotationally driven capstan are kept parallel to each other to ensure stable running of the tape-shaped medium.

However, in the cylindrical bearing portion 10a, the contact point between the bearing portion 10a and the support shaft 4 may become the upper end or the lower end of the bearing portion 10a depending on the inclination direction of the support shaft 4, and the pinch may occur. There is a problem that the roller does not rotate smoothly, and the tape-shaped medium is not smoothly transferred.

The present invention solves the above-mentioned problems.
An object of the present invention is to provide a tape drive device capable of stably running a tape-shaped medium while reducing the drive load on the tape-shaped medium.

[0025]

In order to solve the above problems, a tape drive device of the present invention has a pinch roller in which a bearing portion and a base portion are integrally formed of a rigid synthetic resin material. An outer peripheral portion formed of an elastic synthetic resin material is fixed to the outside of the base portion, and a gap is provided between the outer diameter of the support shaft of the pinch roller and the inner diameter of the bearing portion.

Further, in the tape drive device of the present invention, the outer peripheral portion formed of the elastic synthetic resin material is fixed only to the upper end portion and the lower end portion of the base portion of the pinch roller.

Further, in the tape drive device of the present invention, the bearing portion of the pinch roller is formed so as to have a wedge-shaped projection on the surface facing the support shaft of the pinch roller.

[0028]

According to the present invention, since the outer circumference of the pinch roller that is pressed against the rotationally driven capstan via the tape-shaped medium and transports the tape-shaped medium is made of the elastic synthetic resin material, the rubber of the present invention is made. The amount of deformation when pressed by the capstan is smaller than that when the capstan is formed, the load of the pinch roller due to the deformation loss of the outer peripheral portion can be reduced, and the torque of the motor that rotationally drives the capstan can also be reduced. The outer peripheral portion of the pinch roller formed of the elastic synthetic resin material generates a sufficient frictional force to transfer the tape-shaped medium when the tape-shaped medium is pressed against the capstan, and the tape-shaped medium is The tape-shaped medium can be smoothly and stably run without slipping between the outer peripheral portion and the outer peripheral portion.

Further, the inner diameter of the bearing portion of the pinch roller,
Due to the gap provided between the pinch roller and the outer diameter of the support shaft, the outer periphery of the pinch roller can freely tilt with respect to the support shaft, so that the support shaft is parallel to the capstan in manufacturing. Even if the tape is tilted, the outer peripheral portion is always kept parallel to the capstan and is pressed uniformly at all times, so that the tape-shaped medium can be smoothly and stably run.

Further, according to the present invention, the outer periphery of the pinch roller formed of the elastic synthetic resin material is provided only on the upper end portion and the lower end portion of the base portion of the pinch roller having the above-mentioned structure, and the pinch roller is formed of the elastic synthetic resin material. Since the outer diameter of the outer peripheral portion is larger than the outer diameter of the base portion, the outer peripheral portion is deformed by pressure contact with the capstan, and as a result, the base portion formed of a rigid synthetic resin material is also pressure contacted with the capstan,
This will contribute to the transfer of the tape-shaped medium.

Therefore, the running stability characteristics when the outer peripheral portion of the pinch roller is formed of the soft synthetic resin material and the load on the drive of the tape-shaped medium when the outer peripheral portion of the rigid synthetic resin material is formed are reduced. Both of the characteristics can be utilized, smoothness and stabilization of the running of the tape-shaped medium can be achieved, and power consumption of the motor for rotationally driving the capstan can be reduced.

Further, according to the present invention, since the bearing portion of the pinch roller is formed so as to project in a wedge shape with respect to the support shaft of the pinch roller according to the above structure, regardless of the direction of inclination of the support shaft that occurs during manufacturing. The bearing portion and the support shaft are always in contact with each other at the protruding vertex of the wedge shape.

Therefore, since the outer peripheral portion of the pinch roller always rotates in contact with the support shaft at one point, the pinch roller can be smoothly rotated, and the tape-shaped medium can be stably run. .

[0034]

EXAMPLES Examples of the present invention will be described below.

FIG. 4 is a structural diagram of a camera-incorporated VTR using the tape drive device according to the first embodiment of the present invention.

In FIG. 4, 1 is a rotationally driven capstan, 8 is a tape used for recording and reproduction, 11 is a restriction post, 12 is a pinch arm, 13 is a pinch arm support, 14 is an AC head, 15 is a cylinder, 16 and 17
Is a guide roller, and 18 is a pinch roller for transporting the tape 8 for co-operation with the capstan 1.

FIG. 1 is a sectional view showing the main part of the tape drive device according to the first embodiment of the present invention.

In FIG. 1, the base portion 2 of the pinch roller
0b and the bearing portion 20a are integrally formed of a rigid synthetic resin material. In addition, the outer peripheral portion 21 of the pinch roller
Is formed of an elastic synthetic resin material and is fixed to the base portion 20b by baking or the like. Further, the inner diameter of the bearing portion 20a is formed slightly larger than the outer diameter of the support shaft 4 of the pinch roller, and a slight gap 19 is provided between them.

The operation of the first embodiment of the present invention configured as above will be described below. The outer peripheral portion 21 of the pinch roller formed of an elastic synthetic resin material is pressed against the capstan 1 which is rotationally driven with the tape 8 interposed therebetween, and the tape 8 is transported in a predetermined direction at a predetermined speed.

In order to make the tape 8 run stably, it is necessary to press the outer peripheral portion 21 of the pinch roller evenly against the capstan 1. Therefore, the outer peripheral portion 21 needs to be kept parallel to the capstan 1 at all times. There is.

However, it is difficult to make the support shaft 4 of the pinch roller parallel to the capstan 1 in manufacturing.

The state will be described with reference to FIG. Since it is necessary to run the tape 8 around the cylinder 15 and in contact with the AC head 14, the tape 8 is pulled out by the guide rollers 16 and 17 while being drawn.
Wraps around. At the same time, the regulation post 11
Also, the tape 8 is pulled out, and after the tape 8 contacts the capstan 1 and the AC head 14, the pinch arm 12 pushes the outer peripheral portion 21 of the pinch roller to the capstan 1, and the pinch arm 12 moves the pinch arm support shaft 13 Rotate around. In this way, since the support shaft 4 of the pinch roller moves integrally with the pinch arm 12, the backlash between the pinch arm 12 and the pinch arm support shaft 13, the deflection of the pinch arm 12 and the pinch roller support shaft 4 with respect to the pinch arm 12. Due to an attachment error or the like, the pinch roller support shaft 4 easily causes a large tilt error with respect to the capstan 1.

Therefore, an appropriate gap is provided between the inner diameter of the bearing portion 20a of the pinch roller and the outer diameter of the support shaft 4 so as to provide an appropriate gap for compensating the tilt error of the support shaft 4, and the base portion 20 and the outer peripheral portion of the pinch roller. 21 can be freely tilted with respect to the support shaft 4, and when the outer peripheral portion 21 is pressed against the capstan 1, the outer peripheral portion 21 automatically operates so as to be parallel to the capstan 1.

As described above, according to the present embodiment, since the outer peripheral portion 21 of the pinch roller is formed of the elastic synthetic resin material, the deformation amount due to the pressure contact with the capstan 1 is small, so that the tape 8 is driven when the tape 8 is driven. The loss can be reduced, the torque of the capstan 1 can be reduced, and a tape drive device with low power consumption can be realized.

Further, as the outer peripheral portion 21 is made of an elastic synthetic resin material which is lower in hardness and softer than the rigid synthetic resin material forming the base portion 20b, friction when the outer peripheral portion 21 is pressed against the capstan 1 is obtained. Larger, outer circumference 2
It is possible to realize a tape drive device that enables stable tape running without the tape 8 slipping between the capstan 1 and the capstan 1.

Further, since the outer peripheral portion 21 can be freely tilted with respect to the support shaft 4, the outer peripheral portion 21 and the capstan 1 can always be kept in parallel with each other, and both can be pressed uniformly to stabilize the tape 8. And it can run smoothly.

Since the tilt angle of the outer peripheral portion 21 can be freely determined by adjusting the size of the gap, the outer peripheral portion 21 and the capstan 1 are irrespective of the degree of the tilt error of the support shaft 4. Can always be kept parallel.

Further, according to the present embodiment, since the bearing portion 20a and the base portion 20b are integrally formed of the rigid synthetic resin material, the structure of the pinch roller is simple, so that it is small and lightweight and can be manufactured. Stable tape running can be realized by an easy tape driving device.

Next, a second embodiment of the present invention will be described. FIG. 2 is a sectional view showing the main part of a tape drive device according to the second embodiment of the present invention.

In FIG. 2, the tape drive device according to the second embodiment of the present invention is made of elastic synthetic resin material at the upper and lower ends of the base portion 20b of the pinch roller made of rigid synthetic resin material. It has an outer peripheral portion 22.

Since the other components are the same as those in the first embodiment of the present invention, the same reference numerals as those in FIG.

The operation of the second embodiment of the present invention will be described below. The outer peripheral portion 22 of the pinch roller formed of the elastic synthetic resin material provided on the upper end portion and the lower end portion of the base portion 20b of the pinch roller and the base portion 20b formed of the rigid synthetic resin material exposed on the surface of the pinch roller are , Is pressed against the capstan 1 which is rotationally driven via the tape 8, and acts to transfer the tape 8 in a predetermined direction.

In this case, since the outer diameter of the outer peripheral portion 22 formed of the elastic synthetic resin material is larger than the outer diameter of the base portion 20b, the outer peripheral portion 22 is pressed against the capstan 1. As a result, the base portion 20b made of a rigid synthetic resin material is also deformed on the capstan.
The tape 8 is pressed and contributes to the transfer of the tape 8.

As described above, according to this embodiment, the running stability characteristics when the outer peripheral portion of the pinch roller is made of the elastic synthetic resin material and the tape when the outer peripheral portion is made of the rigid synthetic resin material are used. Both of the characteristics of load reduction for driving the tape can be utilized, smoothing and stabilization of the tape running can be achieved, the torque of the motor for rotating the capstan can be reduced, and the power consumption of the tape driving device can be reduced. Reductions can be achieved.

By adjusting the pressure applied to the outer peripheral portion 22 pressed against the capstan 1 or the exposure amount of the base portion 20a of the pinch roller, the running stability of the tape and the reduction of the running load are balanced to improve the efficiency. Good and stable tape running can be realized.

Next, a third embodiment of the present invention will be described. FIG. 3 is a sectional view of the main part of a tape drive device according to the third embodiment of the present invention.

In FIG. 3, the base portion 2 of the pinch roller
0b, the bearing portion 20a integrally formed of a rigid synthetic resin material is formed by protruding the surface facing the side surface of the support shaft 4 in a wedge shape.

The operation of the third embodiment of the present invention configured as above will be described.

Even if the support shaft 4 of the pinch roller is inclined in the direction A or B in FIG. 3 for manufacturing reasons, the outer peripheral portion 20b of the pinch roller is always kept parallel to the capstan 1. , The bearing shaft 20a is formed into a wedge shape while being pressed uniformly,
Regardless of the tilting direction, one point of the bearing portion 20a is always in contact with the support shaft, the pinch roller can be rotated, and smooth tape running is possible.

FIG. 5 is an enlarged sectional view of the bearing portion of the pinch roller used in this embodiment.

In FIG. 5, the outer diameter of the support shaft 4 and the bearing 2
The difference d in the inner diameter of 0a may be extremely small as compared with the first embodiment of the present invention in which the side surface of the bearing portion is formed as a flat surface, and d
Even when = 0, the outer peripheral portion 21 of the pinch roller can be freely tilted with the wedge-shaped apex of the bearing portion 20a as a fulcrum, so that the effect of this embodiment can be sufficiently obtained.

Further, the bearing portion 22a of the pinch roller is
Even in the case of a hemispherical structure as shown in FIG. 6, the same effect as that of this embodiment can be obtained.

[0063]

As described above, according to the present invention, since the outer peripheral portion of the pinch roller is formed of the elastic synthetic resin, the deformation amount when pressed against the capstan is smaller than that of the rubber member, and the outer periphery is reduced. It is possible to reduce the load of the pinch roller caused by the deformation loss of the portion, and it is also possible to reduce the torque of the motor that rotationally drives the capstan.

Further, the reduction of the torque of the capstan motor contributes to the reduction of the power consumption of the tape driving device, and as a result, it contributes to the long-time recording / reproduction of the camera-integrated VTR, the tape recorder, or the like. .

On the other hand, since the outer peripheral portion of the pinch roller is formed of an elastic synthetic resin material which has a lower hardness and is softer than the rigid synthetic resin material forming the base portion, the tape-shaped medium is pressed when it is pressed against the capstan. A sufficient frictional force is generated for transporting, the tape medium does not slip between the capstan and the outer peripheral portion, and the tape medium can be smoothly and stably run.

Further, according to the present invention, since the outer peripheral portion formed of the elastic synthetic resin material is provided only at the upper end portion and the lower end portion of the pinch roller, both the outer peripheral portion and the base portion of the pinch roller are provided. The tape is pressed against a rotationally driven capstan to contribute to the transfer of the tape-shaped medium, and the tape running property when the outer peripheral portion is formed of an elastic synthetic resin material, and the outer peripheral portion is formed of a rigid synthetic resin material. In this case, both characteristics of load reduction for tape drive can be utilized in a well-balanced manner, and it is possible to realize a tape drive device that efficiently and stably runs a tape-shaped medium.

Further, according to the present invention, the bearing portion of the pinch roller is formed in a protruding wedge shape, so that the bearing is always formed at the apex of the wedge shape regardless of the tilt direction of the support shaft of the pinch roller that occurs during manufacturing. It is possible to realize a tape drive device having a very simple configuration, in which the pinch roller is in contact with the support shaft and the pinch roller can be smoothly rotated, and the tape-shaped medium can be stably and smoothly run.

Further, according to the present invention, the bearing portion and the base portion of the pinch roller are integrally formed, the structure of the pinch roller is simple, the size and weight can be easily reduced, the number of parts is small, and the tape This contributes to easy manufacturing of the driving device and reduction of manufacturing cost.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a tape drive device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a tape drive device that is a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a main part of a tape drive device that is a third embodiment of the present invention.

FIG. 4 is a structural diagram of a camera-integrated VTR using the tape drive device according to the first embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view of a bearing portion of a pinch roller used in a tape drive device that is a third embodiment of the present invention.

FIG. 6 is an enlarged cross-sectional view of a bearing portion of a pinch roller used in a tape drive device that is a third embodiment of the present invention.

FIG. 7 is a sectional view of a main part of a conventional tape drive device.

FIG. 8 is a sectional view of a main part of a conventional tape drive device.

[Explanation of symbols]

 1 Capstan 4 Support shaft of pinch roller 8 Tape medium 20a Bearing part of pinch roller 20b Base part of pinch roller 21 Peripheral part of pinch roller

Claims (3)

[Claims] 1. A capstan drive means, a capstan that is rotationally driven by the capstan drive means, and a pinch roller that is pressed against the capstan to transfer a tape-shaped medium, and the pinch roller is supported. A shaft, a bearing portion for receiving the support shaft, and a base portion integrally molded with the bearing portion by a rigid synthetic resin material,
It is composed of an outer peripheral portion fixed to the outside of this mother portion,
When the tape-shaped medium is transferred, the outer peripheral portion contacting the tape-shaped medium is formed of an elastic synthetic resin material having a hardness lower than that of the rigid synthetic resin material, and between the outer diameter of the support shaft and the inner diameter of the bearing portion. A tape drive device characterized in that a gap is provided in the tape drive device. 2. The tape drive device according to claim 1, wherein the outer peripheral portion is fixed only to an upper end portion and a lower end portion of the base portion. 3. The tape drive device according to claim 1, wherein the bearing portion is formed by protruding a surface facing the support shaft of the pinch roller in a wedge shape.