JPH04366458A - guide roller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide roller for guiding a magnetic tape in a magnetic recording/reproducing apparatus such as a video tape recorder (VTR).

0002

[Prior Art] As described in the conventional example in Japanese Patent Laid-Open No. 63-66751, the magnetic tape guide rollers in conventional VTRs, etc. Guide rollers made of resin such as polyacetal were used to prevent dirt. However, recently, in order to cope with higher performance magnetic tapes, it has become necessary to improve performance by using metal guide rollers that have good friction characteristics with the tape. Therefore, press-fitted and assembled guide rollers are beginning to be used, with the bearing part made of resin and the contact part with the tape made of stainless steel.

FIG. 3 is a sectional view showing an example of a conventional guide roller made of a press-fit assembly of the above-mentioned resin roller bearing member and metal roller outer diameter member, and its assembled state. In the figure, 1A is a guide roller consisting of a resin roller bearing member 2A and a pipe-shaped metal roller outer diameter member 3, 4 is a shaft with a threaded portion at its tip, 5 is a lower flange, and 6 is a compression spring, 7 is a sleeve, and 8 is an upper flange. The lower flange 5, which is inserted into the shaft 4 and guides the lower edge of the tape, is biased upward in the drawing by a compression spring 6.
A sleeve 7 fitted onto the shaft 4 is positioned above the lower flange 5. The roller bearing member 2A and the roller outer diameter member 3 are integrated by press fitting, and the guide roller 1
A, and the guide roller 1A is fitted into the outer periphery of the sleeve 7 and rotatably held by the shaft 4. Further, an upper flange 8 for guiding the upper edge of the tape is screwed and attached to the threaded portion at the tip of the shaft 4. The roller bearing member 2A has a slightly shorter bearing length than the sleeve 7, and can rotate without being tightened by the upper and lower flanges 5 and 8. Therefore, if the upper flange 8 is tightened or loosened in this state, the height of the guide roller 1A can be changed by the thread pitch since the compression spring 6 is constantly pushing up the upper flange 8, and this allows the guide roller 1A to be optimized. It is adjustable in height.

0004

By the way, in the case of the structure shown in FIG. 3, when the roller bearing member 2A is press-fitted into the roller outer diameter member 3, the resin roller bearing member 2A is scraped, and the roller bearing There are shavings 9 on the tip of the press-fit side of member 2A.
The problem is that these shavings 9 come into contact with the lower flange 5 during rotation (section A in Fig. 3), which creates a load during rotation and adversely affects rotational performance (causing rotation loss). was there. For this reason, severe parts accuracy control is required, and a process of inspecting and removing the shavings 9 is required, which also poses a cost problem.

[0005] Therefore, the technical problem to be solved by the present invention is to solve the above-mentioned problems of the prior art.
The purpose is to provide a guide roller that is suitable for high-performance equipment, has good rotational performance, and is inexpensive.

[0006]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a guide roller in which a roller bearing member and a roller outer diameter member are integrated by press fitting, at least one end of the roller bearing member in the axial direction. The outer diameter of the roller bearing member is smaller than the press-fitting part, and an annular groove is provided between the tip having the small outer diameter and the press-fitting contact part, and the groove extends over the entire outer circumference of the roller bearing member. be done.

[0007]

[Operation] Since the outer diameter of the roller bearing member at the leading end in the insertion direction is smaller than the press-fitting dimension, no chips are generated during press-fitting at the leading end with the small outer diameter. In addition, shavings generated at the tip of the press-fit dimension part of the roller bearing member accumulate in the annular groove formed between the tip part with the small outer diameter dimension and the press-fit contact part, and are deposited on the tip side of the roller bearing member. Since it does not come out, the flange will not come into contact with the shavings when using the guide roller, ensuring good rotation performance. Furthermore, since there is no need to inspect for shavings and to remove shavings, the cost is also reduced.

[0008]

[Embodiment] The present invention will be explained below with reference to an embodiment shown in FIGS. 1 and 2. FIG. 1 is a sectional view showing the structure of the guide roller, and FIG. 2 is a sectional view showing the assembled state of the guide roller. In FIG. 2, 3 is a roller outer diameter member;
is a shaft with a threaded portion at the tip, 5 is a lower flange, 6 is a compression spring, 7 is a sleeve, 8 is an upper flange, and 9 is a scrap, and these are equivalent to those shown in Figure 3. , the detailed explanation is omitted to avoid duplication. The guide roller 1 of this embodiment also has a double structure in which a roller bearing member 2 made of a resin such as polyacetal and a roller outer diameter member 3 made of a pipe-shaped metal (for example, stainless steel) are press-fitted and integrated. As shown in FIG. 2, the guide roller 1 is rotatably held by a shaft 4 as in the conventional example.

One axial side of the roller bearing member 2 (
The tip end 2a (tip side in the press-fitting direction) is attached to the roller bearing member 2.
The diameter is slightly smaller than the press-fit outer diameter part 2b, and an annular groove 2c extending over the entire outer circumference of the roller bearing member 2 is formed between this tip part 2a and the press-fit outer diameter part 2b. There is. Therefore, the roller bearing member 2 is connected to the roller outer diameter member 3.
When press-fitting into the roller outer diameter member 3, the tip 2a of the roller outer diameter member 3 is not scraped, and no shavings 9 are generated at the tip 2a. In addition, during the press-fitting process, there is a possibility that shavings 9 may appear on the tip side of the press-fitting outer diameter portion 2b in the press-fitting direction.
Since the chips 9 accumulate in the groove 2c between the press-fit outer diameter portion 2b and the press-fit outer diameter portion 2b, the shavings 9 that protrude from the thrust receiving surface of the press-fit and assembled guide roller 1 do not come out.

Therefore, in the installed state of the guide roller 1 shown in FIG. 2, the shavings 9 do not come into contact with the thrust receiving surface of the lower flange 5, and the shavings 9 are not affected by the press-fitting process. It becomes possible to realize the guide roller 1 with excellent rotational performance. Moreover, since the conventional process of inspecting for shavings and removing shavings can be omitted, the cost is also reduced.

[0011] In the above-mentioned embodiment, the above-mentioned slightly smaller diameter tip 2a and the annular groove 2c connected thereto are provided only on one side in the axial direction of the roller bearing member 2. The tip portion 2a and the groove 2c may be provided on both axial end sides of the tube 2, respectively.In this way, press fitting can be performed regardless of the directionality, and the assembly is excellent. It can be done.

0012

[Effects of the Invention] As explained above, according to the present invention, it is possible to eliminate the influence of shavings during press-fitting, ensure good rotational performance, and eliminate the need for inspection and removal of shavings. Therefore, there is a great effect that a guide roller can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of a guide roller according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an assembled state of a guide roller according to an embodiment of the present invention.

FIG. 3 is a sectional view showing a state in which a conventional guide roller is installed.

[Explanation of symbols]

1 Guide roller 2 Roller bearing member 2a Tip 2b Press-fit outer diameter part 2c groove 3 Roller outer diameter member 4 Shaft 5 Lower flange 6 Compression spring 7 Sleeve 8 Upper flange 9. Shavings

Claims (4)

[Claims] 1. In a guide roller having a dual structure in which a roller bearing member and a roller outer diameter member made of different materials are integrated by press fitting, the outer diameter dimension of the tip of at least one side in the axial direction of the roller bearing member. is smaller than the size of the press-fitting part, and an annular groove extending over the entire outer circumference of the roller bearing member is provided between the tip portion having the small outer diameter size and the press-fitting contact portion. 2. The guide roller according to claim 1, wherein the roller bearing member is made of a resin material, and the roller outer diameter member is made of a metal material. 3. The roller bearing member according to claim 1, wherein the roller bearing member has a tip portion having a small outer diameter and a groove connected to the tip portion, which are formed at both ends in the axial direction of the roller bearing member. guide roller. 4. A guide roller according to claim 1, wherein the outer diameter member of the roller is in contact with a magnetic tape and is used to guide the running of the magnetic tape.