JP2542992Y2 - Guide roller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a guide roller for guiding the traveling of a magnetic tape.

[Prior Art] As shown in FIG. 6, a conventional guide roller regulates a tape width direction by an upper flange and a lower flange, and the tape is wound around a roller portion and rotates together with the roller to reduce traveling loss. It had a similar structure. Japanese Utility Model Application Laid-Open No. 58-56356 discloses this type of guide roller.

[Problems to be solved by the invention]

According to the above-described conventional technology, when the tape is repeatedly used, magnetic powder separated from the tape or dust in the environment, which enters the bearing of the guide roller from the gap between the guide roller and the flange, causes loss of rotation of the guide roller. No consideration has been given to the possibility of causing
There was a problem that jitter and WOW performance deteriorated.

In particular, the recent S-VHS (registered trademark) VTR system VTR system
For products requiring high performance as described above, this problem, which was not a major problem in conventional products, became a very serious problem. This problem is due to the fact that the speed of deterioration varies depending on the number of times of use, the state of tape used, and the environmental condition, and once foreign matter has entered the bearing part, the performance has deteriorated unless the guide roller is converted. Since the state continues, a guide roller having a structure that does not cause a problem in use with respect to the magnetic powder and dust of the tape is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a guide roller which eliminates the drawbacks of the prior art, prevents the rotation loss of the guide roller from increasing due to magnetic powder or dust, and has less deterioration in performance.

[Means for solving the problem]

An object of the present invention is to provide a structure in which a concave groove is provided on a roller-side surface of a flange member of a guide roller so that magnetic powder, dust, and the like do not enter a bearing portion. Also, by making the concave groove a ring-shaped groove smaller than the outer diameter of the guide roller,
The appearance performance can be maintained as before.

[Action]

When foreign matter such as magnetic powder and dust from the tape enters from the gap between the guide roller and the flange while the tape is running, the foreign matter falls into the recess provided in the flange and is stopped. Since the intrusion can be prevented, stable rotation of the roller can be obtained, and performance deterioration due to an increase in rotation loss of the guide roller can be prevented.

By making the concave groove a ring-shaped groove smaller than the outer diameter of the guide roller, the gap between the flange and the roller can be set in the same way as the conventional guide roller in terms of the dimensions such as the flange interval of the tape contact part. Become.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First
The figure is a sectional view showing the guide roller of the present invention, in which the lower flange 3 is pressed into the shaft 4 and the guide roller 2 is inserted.
The upper flange 1 is press-fitted. The lower flange 3 is provided with a ring-shaped concave groove 3 a on the guide roller 2 side.

FIG. 2 is an enlarged cross-sectional view of the concave groove 3a of the lower flange 3 of the guide roller according to the present invention. In the case where the magnetic powder and dust 5 enter through the gap between the lower flange 3 and the guide roller 2,
The magnetic powder and dust 5 are prevented from falling into the concave groove 3a and entering.

FIG. 3 is an enlarged cross-sectional view of the vicinity of the lower flange 3 of the conventional guide roller. If the magnetic powder and dust 5 enter the guide roller, they enter the thrust receiving portion of the guide roller.
If there is no place for dust to escape, if it gets worse, it will get into the bearings and increase the rotation loss of the guide rollers, causing jitter and WO.
Performance degradation such as W occurs.

FIG. 4 is a sectional view showing a guide roller in a case where a concave groove 1a is provided in the upper flange 1, which is another embodiment of the present invention.
FIG. 4 is a sectional view showing a guide roller according to another embodiment of the present invention, in which concave grooves 1a and 3a are provided in an upper flange 1 and a lower flange 3. In any case, depending on the position of use of the product, depending on the location where magnetic powder and dust 5 can easily enter,
Setting 3a will be effective.

FIG. 7 is a sectional view of the embodiment when the shape of the thrust receiving portion of the guide roller 2 is flat. As shown in Fig. 1 etc., to reduce the rotation loss of the conventional thrust receiver, the stepped portion 2a
Although the shape of the guide roller 2 is provided with a groove, by providing the concave grooves 1a, 3a in the upper and lower flanges 1, 3, the same effect can be obtained by removing the stepped portion 2a of the guide roller 2, The guide roller can be formed in a simple shape when manufactured.

According to the present embodiment, the influence of the magnetic powder and dust 5 on the guide roller 2 is eliminated, and even if the guide roller 2 is used for a long period of time, an increase in rotation loss is prevented, and a guide roller that performs stable rotation becomes possible. Also, by making the shape of the groove into a ring shape, it is possible to easily form a groove in the production of parts, and furthermore, the shape of the guide roller is also simplified, and the effect can be improved without increasing the cost. .

[Effect of the invention]

According to the present invention, by forming a concave groove in the guide roller flange portion, it is possible to prevent foreign matters such as magnetic powder and dust generated during use from entering the guide roller bearing, so that rotation loss of the guide roller and deterioration of unevenness are reduced. And stable rotation of the guide roller can be obtained, preventing jitter and deterioration of WOW performance. Further, when the concave groove is a ring-shaped concave groove, it can be easily manufactured by an automatic plate or the like in manufacturing parts, and can be manufactured without increasing cost because the shape of the guide roller can be simplified.
By forming the ring into a ring shape smaller than the outer diameter of the guide roller, the same tape as the conventional flange can be regulated, and a guide roller with stable rotation can be obtained without the disadvantage of running due to the addition of the concave groove.

[Brief description of the drawings]

FIG. 1 is a sectional view of a guide roller according to an embodiment of the present invention, FIG. 2 is an enlarged view of a lower flange portion of the guide roller in FIG.
The figure is an enlarged view of the lower flange portion of the conventional guide roller, FIGS. 4 and 5 are sectional views of the guide roller of another embodiment, FIG. 6 is a sectional view of the conventional guide roller, and FIG. It is sectional drawing of the Example of FIG. 1 upper flange, 1a concave groove 2 guide roller 3, lower flange 3a concave groove 4, shaft 5 magnetic powder and dust, 6 tape

Claims (1)

(57) [Scope of request for utility model registration] In a guide roller for guiding a magnetic tape, at least one flange of a flange member provided at both ends of the guide roller has a ring-shaped smaller than the outer diameter of the guide roller on a thrust receiving surface of the guide roller. A guide roller, wherein a groove is provided, and the groove is not in contact with the guide roller, and the inner surface of the groove controls and guides the guide roller in the tape width direction.