JPS6023827Y2 - Tape pad device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tape pad device in which a tape pad is attached to a plate-like elastic member, and in particular, it provides a tape pad device suitable for use with a tape cassette that stores a magnetic tape therein. It is.

In a tape cassette, a tape pad device for pressing the magnetic tape onto the magnetic head is provided at a position facing the magnetic head.

Conventionally, this type of tape pad device is usually constructed by pasting felt woven with rabbit hair (for example, 100% rabbit hair) onto the surface of a phosphor bronze plate punched into a predetermined shape.

However, cassettes using this tape pad suffer from output fluctuations and wow/flutter, are unstable to use in high humidity conditions, and are accompanied by cue sounds and stick-5-lip. turn into.

As a result of various studies, the inventor of the present invention found that one of the causes of such a phenomenon is that the pad pressure cannot be kept high enough because the surface friction coefficient of the felt used is large.

Another possible tape pad device is one in which an elastic material such as a sponge is adhered to the surface of a phosphor bronze plate, and a thin plate made of tetrafluoroethylene is adhered to the sliding surface of the magnetic tape. , since it requires two bonding processes to manufacture the pad, it is disadvantageous in terms of workability and high cost.Furthermore, the surface of the thin plate described above is abraded due to long-term use, inhibiting uniform tape bonding, and therefore, it is still It is not practical.

The present invention provides a tape pad device in which a tape pad is attached to a plate-like elastic member, in which fluorine fibers are mixed with animal fibers and/or chemical fibers (however, fluorine fibers are excluded), and the tape is pressed in the tape pressing direction. The present invention relates to a tape pad device, characterized in that at least the tape contacting surface of the tape pad is made of a nonwoven fabric having a sufficient thickness.

With this structure, it is possible to reduce the surface friction coefficient at the tape contact surface and improve wear resistance, and it is also possible to mix animal fibers and/or chemical fibers (excluding fluorine fibers) with fluorine fibers. By appropriately adjusting the ratio, it becomes possible to freely set the surface friction coefficient, that is, the friction coefficient against the tape.

Moreover, since the frictional bond between the single fibers is large, the single fibers separate (
It is possible to prevent fraying and improve durability.

As a result, there is almost no deterioration in output characteristics even after long-term use, and it is possible to maintain good sound quality.

Furthermore, since the amount of expensive fluorine fibers used can be reduced, the cost of the device can be reduced.

In the present invention, Fallon F9 is used as the above-mentioned fluorine fiber.
It is desirable to use 150 or 9075 (both trade names manufactured by Nippon Felt Industries Co., Ltd.).

Examples of animal fibers to be mixed with such fluorine fibers include dead weight of fur or angora, wool, etc., and examples of chemical fibers include glass fibers, acetate, nylon, viscose, etc. Examples include chemical fibers.

The mixing ratio of such fibers to fluorine fibers is determined by the coefficient of friction against the tape and durability.

Before describing the embodiments of the present invention, a reference example in which the tape pad in the tape cassette is constructed only of fluorine fiber will be described with reference to FIGS. 1 to 6.

The tape pad used in this reference example is constructed from a non-woven felt made of 100% Fallon F9150 or 9075.

This Fallon is a type of ultra-fine fiber of Teflon (trade name of polyfluoroethylene fiber made by DuPont), and the Fallon pad is characterized by a lower coefficient of friction than dead weight felt as shown below. It is.

Fallon pad: Friction coefficient -90.2 Rabbit hair (fur or angora) band: Friction coefficient 0.3 Next, the configuration of a tape cassette incorporating such a Fallon pad is shown in Figures 1 to 3. Please explain.

The cassette 13 is made up of an upper half 1 and a lower half 2 joined together, and a reel hub 9 on which a magnetic tape 7 is wound is arranged around the drive holes 3 and 4.

Further, inside the head insertion preparation section 5, a tape pad device 6 according to this embodiment is arranged.

As shown in an enlarged view in FIG. 3, this tape pad device 6 consists of a phosphor bronze plate 11 that has been punched out into a predetermined shape, and the above-mentioned nonwoven felt 12 manufactured by Fallon is adhered to the center of the frame using an adhesive. It is something that

FIG. 2 shows the lower half 2, in which the magnetic tape 7 guided by the guide roller 8 is elastically pressed against the magnetic head 10 by the nonwoven felt 12 of the tape pad device 6.

According to the cassette 13 configured in this way, since the surface friction coefficient of the nonwoven felt 12 acting as a tape pad is smaller than that of the conventional one, the tape travels even when the magnetic tape 7 is pressed onto the head 10. It is also possible to increase the pad pressure by increasing the thickness of the phosphor bronze plate 11.

Therefore, the magnetic tape 7 has a good flat touch, suppresses output fluctuations, and makes it possible to reduce wow/black to 172 or less compared to conventional products.

In addition, when compared to a pad made of a thin plate made of tetrafluoroethylene attached to the pad surface, it was confirmed that the pad according to this reference example suffered less wear, and this was especially noticeable for the magnetic tape with a back coat. .

In addition, with the cassette equipped with the tape pad device according to this reference example, it is possible to
-When we measured the sound, we found that no sound occurred.

Next, various properties of the cassette according to this reference example will be explained in more detail.

(1) Repeated Reproduction Output Characteristics and Output FluctuationsThe smaller the attenuation of the reproduction output due to the frequency of use, the better the characteristics.

The cause of this attenuation is thought to be due to changes in the physical properties of the tape as it runs, but since the cassette according to this reference example is equipped with a Fallon pad, the 8KHz It can be seen that the repeated playback output characteristics of the pad are better than pads made of dead weight such as fur or angora.

Furthermore, as shown in FIG. 5, when looking at the output fluctuations at 8 KHz, it can be seen that the output fluctuations become significantly smaller, particularly when the number of tape runs increases to 200 times.

(2) Recording/playback output characteristics If the pressure of the pad against the magnetic head is high to some extent,
Good because there is less spacing loss etc.

However, if the pressure is too high, friction loss occurs at the pad, and the tape tension coverage at the pinch roller and capstan collapses, resulting in uneven rotation.

The Faron pad according to this reference example has a smaller coefficient of friction than the conventional dead weight pad, so the desired pressure bonding force can be obtained.
As shown in FIG. 6, the output characteristics are especially good in the high range.

(3) Reduction in coefficient of friction and base wear It is well known that scratches on the base of a tape have an adverse effect on its running performance (winding torque). Since the coefficient is small, there are very few scratches on the base.

In addition, since Felon is a type of ultrafine Teflon fiber, the Felon fiber is qualitatively softer than its dead weight, and therefore the wear of the base is reduced.

(4) Reduction in wow and flutter Wow and flutter are caused by uneven rotation, but if the friction loss between the head and the pad is large, the tension coverage of the pinch roller and capstan is disrupted, and uneven rotation is likely to occur.

For this purpose, it is possible to increase the driving force of the pinch roller and capstan, but in many cases it is not possible to increase the driving force very much in view of rubber hardness, precision, etc.

Since the Felon pad according to this reference example has a low coefficient of friction, friction loss is reduced, and as a result, uneven rotation is reduced and wow and flutter are reduced as described below.

Felon pad = 0.04 WRMS% Rabbit hair pad: 0.05-0.06 WRMS% However, as mentioned above, when the tape pad is made of 100% Felon felt, the coefficient of friction of the fiber itself is However, because the coefficient of friction is small, the density of the felt cannot be increased, and because the frictional bond between single fibers is weak, it may fray due to external factors such as vibration (separation of single fibers).
Experiments have confirmed that , fuzz, etc. are generated.

After careful consideration, the inventor of the present invention found that animal fibers such as dead weight (fur, angora, etc.) and wool, or chemical fibers such as glass fiber, acetate, nylon, or viscose (excluding fluorine fibers) can be treated with fluorine. We discovered that by mixing fibers, it is possible to freely set the coefficient of friction of the pad against the tape to a desired value, and that it is also possible to prevent the above phenomenon and improve the durability of the pad. Ta.

Next, an example of the present invention will be described. The tape pad according to this example is the Felon F9150 or 9
07 non-woven felt mixed with animal fibers and/or chemical fibers (excluding fluorine fibers) as described above, and made of phosphor bronze in exactly the same way as the tape pad 12 in the reference example described above. It is attached to the plate 11.

Therefore, according to the tape pad device configured as described above, the coefficient of friction against the tape can be made smaller than in the conventional case due to the presence of the fluorine fibers, and the mixing ratio of animal fibers and/or chemical fibers mixed with the fluorine fibers can be reduced. By making appropriate adjustments, the coefficient of friction against the tape can be freely set to a desired value.

Furthermore, since the fluorine fibers are mixed with animal fibers and/or chemical fibers (excluding fluorine fibers), the friction bond between the single fibers becomes stronger, which prevents separation (tearing, fuzz, etc.) between the single fibers. This can be prevented and durability can be improved.

Furthermore, since the amount of fluorine fiber used can be reduced compared to the case where 100% of expensive fluorine fibers are used, the cost of the device can be reduced.

In addition, when animal fibers such as dead weight fibers are used as the fibers to be mixed, the frictional directionality (friction anisotropy of single fibers) of these fibers works to further strengthen the fluorine fiber felt, which has a small coefficient of friction. There is.

Therefore, it is practically preferable to mix fibers with a high frictional directionality, but this mixing ratio is determined by the coefficient of friction against the tape and the durability.

When the fibers to be mixed are synthetic fibers, although these fibers do not have a frictional direction, they can have a coefficient of friction that is at least higher than that of fluorine fibers, so it is preferable to use a nonwoven felt made of 100% fluorine fibers. It is possible to eliminate the drawbacks that it has.

Although the present invention has been described above based on an embodiment, it will be understood that the present invention is not limited to this embodiment and can be further modified based on the technical idea thereof.

For example, in addition to tape cassettes, the present invention can also be applied to recording and reproducing devices having a portion for compressing magnetic tape.

As mentioned above, in the present invention, at least the tape contact surface is made of a nonwoven fabric made of fluorine fibers and animal fibers and/or chemical fibers (excluding fluorine fibers), so the presence of the fluorine fibers reduces the coefficient of friction. At the same time, it is possible to prevent detachment (tearing, fluffing, etc.) between single fibers and improve durability.

Therefore, according to the present invention, the above-mentioned two effects, which were conventionally incompatible, can be achieved at the same time, which is very useful in practice.

Moreover, by appropriately adjusting the mixing ratio of these fibers, the coefficient of friction against the tape can be freely set.

Furthermore, since output fluctuations and wow/flutter can be reduced, good characteristics (for example, sound quality) can be maintained over a long period of time.

In addition to this, the amount of expensive fluorine fibers used can be reduced, which is an extremely significant industrial advantage.

[Brief explanation of drawings]

The drawings show a reference example in which the present invention is applied to a tape cassette. Figure 1 is a perspective view of the tape cassette according to this example, Figure 2 is a plan view of the lower half, and Figure 3 is a tape pad device. FIG. 4 is a comparison diagram showing repeated playback output characteristics, FIG. 5 is a comparison chart showing output fluctuations, and FIG. 6 is a comparison curve diagram showing recording and playback output characteristics. As for the symbols used in the drawings, 6 is a tape pad device, 7 is a magnetic tape, 10 is a magnetic head, 11 is a phosphor bronze plate, and 12 is a nonwoven felt.

Claims (1)

[Scope of utility model registration request] A tape pad device in which a tape pad is attached to a plate-like elastic member is made of a mixture of fluorine fibers, animal fibers and/or chemical fibers (however, excluding fluorine fibers), and has a sufficient thickness in the tape pressing direction. A tape pad device, wherein at least a tape contacting surface of the tape pad is made of a nonwoven fabric comprising: