JPH06243650A - Tape guide device and tape cassette - Google Patents

Abstract

(57) [Summary] [Purpose] The rotating guide used for high-speed running such as fast-forwarding and rewinding of magnetic tape should be used as the fixed guide during low-speed running such as recording and reproducing. [Structure] A control for restricting the rotation of the rotation guide 32 during low-speed traveling such as recording and reproduction of the magnetic tape 2, and releasing the rotation restriction for the rotation guide 32 during high-speed traveling such as fast-forwarding and rewinding of the magnetic tape 2. It is characterized in that means 35 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape guide device most suitable for application to a recording / reproducing device such as a video tape recorder, and a tape cassette equipped with the tape guide device.

[0002]

2. Description of the Related Art Conventionally, as a video tape recorder and a tape cassette which are recording / reproducing devices, there is one as shown in FIG. At this time, the magnetic tape 2 is wound and stored in the tape cassette 1 around the supply reel 3 and the take-up reel 4. A pair of fixed guides 6 and 7 are attached to the left and right sides of the front opening 5 formed on the front surface and the bottom surface in the tape cassette 1, and the magnetic tape 2 is placed between these fixed guides 6 and 7. Guided Figure 7
Is passed along the front opening 5 as shown by the alternate long and short dash line.

On the other hand, in the video tape recorder 11, the supply reel base 12 and the take-up reel base 13, the rotary head drum 14, the loading ring 15 and the capstan 16 which are inclinedly arranged on the lower outer periphery of the rotary head drum 14. Etc. are provided.

At the time of tape loading, the supply reel 3 and the take-up reel 4 of the tape cassette 1 are horizontally mounted on the supply reel base 12 and the take-up reel base 13 of the video tape recorder 11. Then, the magnetic tape 2 is passed in the state of the alternate long and short dash line in the tape cassette 1.

Next, after loading the cassette, the tape loading operation is started, and as shown by the solid line in FIG. 7, the loading ring 15 is rotationally driven in the direction of arrow a by nearly 300 °. Then, the plurality of loading guides 17 mounted on the loading ring 15 and being gradually raised and moved in the direction of the arrow a hook the magnetic tapes 2 in the state of the one-dot chain line in the tape cassette 1 in order. Then, the magnetic tape 2 is sequentially drawn out of the tape cassette 1 in the direction of arrow a. Then, the magnetic tape 2 pulled out is rotated by the rotary head drum 14.
It is loaded onto the outer periphery of the drum at a wrapping angle of 180 ° or more, and the drum entrance / exit guides 18, 19 and capstan 1
6. Loaded on a plurality of fixed heads 20 such as a voice erasing head, a CTL head, a voice recording and reproducing head.

At this time, receiving a driving force from the loading ring 15 rotated in the direction of arrow a, the pair of second pull-out guides 21 on the tape supply side are arranged outside the tape cassette 1 from the backward movement position inside the tape cassette 1. The fixed head 22, which is the full width erasing head, is pulled out in the directions of arrows b and c on both sides, and the tape feed side of the magnetic tape 2 is pulled out in the directions of arrows b and c by these pull-out guides 21. It is loaded on the fixed head 22 and the tension regulator 23.

Similarly, upon receiving a driving force from the loading ring 15, the pull-out guide 24 on the tape winding side is pulled out in the direction of arrow d from the backward movement position inside the tape cassette 1 to the forward movement position outside the tape cassette 1. The pull-out guide 24 pulls out the tape winding side of the magnetic tape 2 in the direction of arrow d.

As described above, the loading of the magnetic tape 2 is completed, and thereafter, the magnetic tape 2 is pressed onto the capstan 16 by the pinch roller 25 mounted on the loading ring 15, and the magnetic tape 2 is fed from the supply reel 3. The magnetic head 2 is recorded and reproduced as desired by the rotary head drum 14 and the fixed heads 20 and 22 while traveling at a low speed on the loading path so as to be wound on the take-up reel 4.

[0009]

In the tape cassette 1 and the video tape recorder 11 of this kind, in order to stably run the magnetic tape 2 at a low speed during recording and reproduction, the tape cassette 1 is provided on both left and right sides of the front opening 5. The pair of tape guides to be provided are fixed guides 6 and 7.

However, recently, a video tape recorder which does not load the magnetic tape 2 as shown by the solid line in FIG. 7 but rewinds the magnetic tape 2 in the tape cassette 1 at a high speed in the pass state shown by the one-dot chain line in FIG. Has also been developed, and from the viewpoint of improving efficiency, it is preferable to run the magnetic tape 2 in the tape cassette 1 at high speed such as fast-forwarding and rewinding.

However, the magnetic tape 2 is replaced by the tape cassette 1.
When running at a high speed in the path state shown by the alternate long and short dash line in FIG. 7 inside, the wrap angle of the magnetic tape 2 with respect to the fixed guide 7 on the most outlet side becomes large, so that the magnetic tape 2 and the fixed guide 7 The contact resistance becomes large, and problems such as deterioration in durability due to scratches on the magnetic tape 2 and increase in dropout due to powder falling off of the magnetic tape 2 occur.

These problems are caused by the fact that the fixed guide 7 does not rotate and the magnetic tape 2 and the fixed guide 7 are always in contact with each other at the same location.

Therefore, it is preferable to configure the fixed guide 7 as a rotation guide. However, when the magnetic tape 2 is running at a low speed for recording and reproduction, the rotation guide serves as a vibration source and wow and flutter occur on the magnetic tape 2. It also causes noise and is not always suitable.

The present invention has been made to solve the above-mentioned problems, and a rotation guide used for high speed running such as fast forward and rewind of a magnetic tape is fixed during low speed running such as recording and reproducing. It is an object of the present invention to provide a tape guide device and a tape cassette that can be selectively used as guides.

[0015]

SUMMARY OF THE INVENTION A tape guide device and a tape cassette of the present invention for achieving the above-mentioned object rotate a guide for guiding a magnetic tape and rotate the guide when the magnetic tape is running at a low speed. A control means is provided for restricting and releasing the rotation restriction of the rotation guide when the magnetic tape is running at a high speed. At this time, the control means is configured to restrict rotation of the rotation guide and release the rotation restriction in accordance with changes in tape tension between the low speed running and the high speed running of the magnetic tape. It is preferable that the means is configured to regulate the rotation of the rotation guide and release the rotation regulation according to the change of the tape path when the magnetic tape is running at a low speed and when the magnetic tape is running at a high speed.

[0016]

The tape guide device and the tape cassette of the present invention configured as described above restrict the rotation of the rotation guide during low speed running such as recording and reproducing of the magnetic tape, and fast forward and rewind the magnetic tape. When traveling at high speed, the rotation restriction of the rotation guide can be released, so that the rotation guide can be properly used as the fixed guide.

[0017]

Embodiments of the tape guide device and the tape cassette to which the present invention is applied will be described below with reference to FIGS. It should be noted that the same structural parts as those in FIG.

First, as shown in FIGS. 1 to 5, a pair of rotation guides (so-called guide rollers) 31, 32 are provided on the outer periphery of the fixed shafts 32, 33 on the left and right sides of the front opening 5 in the tape cassette 1, respectively. It is rotatably attached.

The pair of left and right rotation guides 3 are provided.
The magnetic tape 2 is passed in a zigzag shape between the first and the second 32, and a control means 35 for selectively using the rotation guide 32 on the most outlet side as a rotation guide and a fixed guide according to a change in the tape tension of the magnetic tape 2 is provided. It is provided.

The control means 35 includes a strip-shaped plate 36 having elasticity such as polyester and stainless steel, and the strip-shaped plate 36.
The front end portion 36a to the intermediate portion 36b of which the outer periphery is covered with a tape protection member 37 such as ultra-high molecular weight polyethylene or Teflon is used.

Then, the base portion 36c of the strip-shaped plate 36 is inserted into the gap 38 between the ribs 1d and the screwing boss 1c integrally formed between the upper and lower halves 1a and 1b of the tape cassette 1, and at the same time, one of the ribs 1d is formed. A slit 39 is fitted into the portion, and is fixed in a fixed position so as to be sandwiched from above and below by the upper and lower halves 1a and 1b. And
A front end portion 36a of the strip-shaped plate 36 is bent at a substantially right angle, and an intermediate portion 36b of the strip-shaped plate 36 is configured to be crimpable and separable on the outer circumference of the rotation guide 31 with the magnetic tape 2 interposed therebetween. A tip portion 36a of the belt-shaped plate 36 is configured to be pressure-bonded to and separated from the outer circumference of the rotation guide 32.

According to the control means 35, when the tape cassette 1 is not used, the magnetic tape 2 is provided between the pair of left and right rotary guides 31, 32 as shown in FIGS. Has the lowest tension, and the tips 36a and the intermediate portions 36b of the strips 36 have arrows e and f.
Elastic return in the direction. The intermediate portion 36b presses the magnetic tape 2 onto the outer circumference of the rotation guide 31 in the direction of arrow e, and the tip portion 36a contacts the outer circumference of the rotation guide 32 with arrow f.
From the direction, the rotation of both rotation guides 31 and 32 is regulated to prevent the magnetic tape 2 from loosening.

At this time, the center holes 31a and 32a of the rotation guides 31 and 32 having clearances with respect to the fixed shafts 33 and 34 have the arrows e and f with respect to the fixed shafts 33 and 34.
The rotation resistance of the rotation guides 31 and 32 with respect to the fixed shafts 33 and 34 increases due to the deviation in the direction, and thus the rotation of the rotation guides 31 and 32 is restricted.

Next, as shown by the solid line in FIG. 7, the tape cassette 1 is mounted on the video tape recorder 11,
After the magnetic tape 2 is loaded, when recording / reproduction is performed at a low speed of the magnetic tape 2, as shown in FIG. 1B and FIG. The tension of the magnetic tape 2 rises to a certain height, and the winding angle θ ₁ of the magnetic tape 2 with respect to the rotation guide 32 arranged closest to the outlet side becomes the minimum.

Then, the tension of the magnetic tape 2 causes the intermediate portions 36b of the strip-shaped plates 36 to move in the direction of arrow g against the elasticity, and the rotation regulation of the rotation guide 31 is released, but the tip portion 36a still remains. The rotation of the rotation guide 32 is restricted.

Therefore, when the magnetic tape 2 is running at a low speed for recording and reproducing, the rotation of the pair of left and right rotation guides 32 arranged on the most outlet side in the tape cassette 1 is restricted (whether the rotation is stopped or not). Since it rotates slightly while slipping on the magnetic tape 2), the rotation guide 31
Does not become a vibration source, and wow and flutter of the magnetic tape 2 and the generation of noise can be suppressed as much as possible, recording,
The reproduction characteristics are improved.

Next, as shown by the alternate long and short dash line in FIG. 7, when the video tape recorder 11 performs high-speed running such as fast forward and rewind in the tape cassette 1, the magnetic tape 2 of FIG. 4) and FIG. 4, the tension of the magnetic tape 2 between the pair of left and right rotating guides 31 and 32 is maximized, and the magnetic tape 2 is wound around the rotating guide 32 arranged on the most outlet side. The angle θ ₂ is maximum.

Then, the tension of the magnetic tape 2 causes the intermediate portions 36b of the strip-shaped plates 36 to largely move in the direction of the arrow g against the elasticity, and the tip portion 36a is separated from the outer periphery of the rotation guide 32 in the direction of the arrow h. The rotation restriction of the rotation guide 32 is released.

Therefore, when the magnetic tape 2 is traveling at high speed in the tape cassette 1 for fast-forwarding and rewinding, the rotation restrictions of the pair of left and right rotation guides 31 and 32 are released, and therefore these rotation guides are released. 31 and 32 can follow the magnetic tape 2 and rotate smoothly at high speed,
The contact resistance between the magnetic tape 2 and the rotation guides 31 and 32 is reduced to prevent the magnetic tape 2 from being scratched or dusted off, improving the durability of the magnetic tape and the rotation guide, and at the same time the magnetic tape 2 The high-speed running in the tape cassette 1 can be efficiently performed.

Next, FIG. 6 shows a modified example. In this case, control for restricting the rotation of the rotation guide 32 and releasing the rotation restriction according to the change of the tape path of the magnetic tape 2. The means 45 is used.

As the control means 45, a rotary arm 47 mounted in the tape cassette 1 via a fulcrum shaft 46 so as to be rotatable in the directions of arrows i and j is used.
The tape contact portion 48 is provided at one end of the rotation guide 3
A frictional engagement portion 49 made of rubber or the like is provided on the outer periphery of 2 so that it can be pressed and separated. The rotary arm 47 is urged to rotate in the direction of arrow i by the pressure spring 50.

According to this control means 45, FIG.
As shown in FIG. 3, when the magnetic tape 2 is traveling at a low speed for recording and reproducing, the wrap angle θ ₁ of the magnetic tape 2 with respect to the rotation guide 32 is small, so that the tape contact portion 48 of the rotating arm 47 is attached to the magnetic tape 2. Without contact, the rotation arm 47 is rotated in the direction of arrow i by the pressure spring 50, and the frictional engagement portion 49 such as rubber is pressure-bonded to the outer periphery of the rotation guide 32 to regulate the rotation of the rotation guide 32.

Next, as shown in FIG. 6B, the winding angle θ of the magnetic tape 2 with respect to the rotation guide 32 during high-speed running in the tape cassette 1 for fast-forwarding and rewinding the magnetic tape 2. _{Since 2} becomes large, the rotating arm 47
The tape contact portion 48 is pressed by the magnetic tape 2 in the direction of arrow j against the pressure spring 50. Then, the frictional engagement portion 49 is separated from the outer periphery of the rotation guide 32 in the arrow j direction, and the rotation restriction of the rotation guide 32 is released.

Therefore, the same effect as described above can be obtained also by this modification. In this modified example, a gear is formed on the outer periphery of the lower end of the rotation guide 32 or the like where it does not come into contact with the magnetic tape 2, and a gear is formed on the frictional engagement portion of the rotating arm 47, so that the magnetic tape 2 runs at low speed. At times, it is possible to engage both of these gears to completely stop the rotation of the rotation guide 32, and to separate these gears and rotate the rotation guide 32 when the magnetic tape 2 runs at high speed. .

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention. For example,
The control means 35 and 45 are not limited to the above-mentioned embodiments, and may be any mechanism as long as it is a mechanism for restricting the rotation of the rotation guide and releasing the rotation restriction in relation to the low speed running and the high speed running of the magnetic tape.

[0036]

The tape guide device and the tape cassette of the present invention constructed as described above have the following effects.

The tape guide device and the tape cassette according to claims 1 and 4 restrict the rotation of the rotation guide when the magnetic tape is running at a low speed such as recording or reproducing, and when the magnetic tape is fast-forwarding or rewinding at a high speed. Since the rotation restriction of the rotation guide is released and the rotation guide can be selectively used as the fixed guide, high-speed running for fast-forwarding and rewinding the magnetic tape in the tape cassette can be realized.

In the tape guide device and the tape cassette according to claims 1 and 4, the rotation guide is restricted from rotating during low-speed running such as recording and reproducing of the magnetic tape. You can improve the recording and playback characteristics by minimizing the generation of wow, flutter and noise.

In the tape guide device and the tape cassette according to the first and fourth aspects, the rotation restriction of the rotation guide is released during high-speed running such as fast-forwarding and rewinding of the magnetic tape, so the contact resistance between the magnetic tape and the rotation guide. The magnetic tape is prevented from being scratched or powder is removed, the durability of the magnetic tape and the rotation guide is improved, and high-speed running of the magnetic tape in the tape cassette can be efficiently performed.

The tape guide device according to the second and third aspects of the invention controls the rotation of the rotation guide and the release of the rotation restriction by the control means according to changes in the tape tension and the tape path when the magnetic tape is running at low speed and at high speed. Since it can be done automatically, it is highly reliable.

According to the tape cassette of claim 4, when the tape cassette is not used, the control means can prevent the tape from loosening, and the control means also serves as the rotation restricting member of the rotation guide and the tape loosening prevention member. Also, the cost can be reduced by reducing the number of assembling steps.

[Brief description of drawings]

FIG. 1 is a plan view illustrating an operation of a main part of a tape guide device and a tape cassette according to an embodiment of the present invention.

FIG. 2 is a plan view showing the tape guide device and the tape cassette of the present invention when not in use.

FIG. 3 is a plan view showing recording and reproducing of the tape guide device and the tape cassette of the same.

FIG. 4 is a plan view showing fast-forwarding and rewinding of the tape guide device and the tape cassette of the same.

5A and 5B are a perspective view and a cross-sectional side view for explaining the attachment structure of the strip plate.

FIG. 6 is a plan view showing an operation of a modified example of the tape guide device and the tape cassette of the present invention.

FIG. 7 is a schematic plan view illustrating a recording / reproducing mode and a fast-forwarding / rewinding mode of the tape cassette and the video tape recorder.

[Explanation of symbols]

 1 tape cassette 2 magnetic tape 11 video tape recorder 31, 32 rotation guide 35, 45 control means

Claims (5)

[Claims] 1. A rotation guide for guiding a magnetic tape, and a control means for restricting rotation of the rotation guide when the magnetic tape is running at a low speed and for canceling rotation restriction of the rotation guide when the magnetic tape is running at a high speed. A tape guide device characterized in that 2. The control means is configured to regulate rotation of the rotation guide and release the rotation regulation in accordance with changes in tape tension during low-speed running and high-speed running of the magnetic tape. The tape guide device according to claim 1, which is characterized in that. 3. The control means is configured to regulate rotation of the rotation guide and release the rotation regulation in accordance with changes in the tape path when the magnetic tape is running at low speed and at high speed. The tape guide device according to claim 1, which is characterized in that. 4. A tape cassette provided with the tape guide device according to claim 1, 2, or 3. 5. The tape cassette according to claim 4, wherein the control means is also configured to prevent the magnetic tape from loosening when not in use.