JPH0464955A - Guide roller and its production - Google Patents

Abstract

PURPOSE:To prevent the variance of a contact part due to the tension acting on a roller by providing a bearing part which is fixed to the inside wall surface of the roller and is brought into contact with the outer peripheral surface of a supporting shaft to support the roller on the supporting shaft and has a narrowed contact area to the outer peripheral surface of the supporting shaft. CONSTITUTION:A pair of bearing bodies 14A and 14B to smoothly support a roller 2 around a supporting shaft 6 set on the axis of a roller main body 2 are press-fitted to the inside wall surface of a transmission hole 24 of the roller 2 so that their bearing parts 142 are on the end part sides. Bearing bodies 14A and 14B are cylindrical bodies having the same center as the roller 2 and one end parts closed with bearing parts 142 having 1/(several) of the length of bearing bodies 14A and 14B for the purpose of narrowing the contact area to the supporting shaft 6. Bearing bodies 14A and 14B are made of a hard synthetic resin. Since thin bearing parts 142 are formed by this constitution, the contact area between inside wall surfaces of the bearing holes 144 of bearing parts 142 and the supporting shaft is narrowed.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a guide roller used for guiding a recording tape such as a video tape, and a method for manufacturing the same.

[Conventional technology]

2. Description of the Related Art Conventionally, a tape running system of a video recorder (VTR) is equipped with a sliding guide roller that guides the running of a magnetic recording tape. For example, as shown in FIG. 4, this guide roller is provided with a roller body 2 that guides the transfer of a strip-shaped magnetic recording tape as an object to be transferred. The roller body 2 is formed into a cylindrical shape from a metal such as brass or stainless steel, and is rotatably supported by a support shaft 6 with a cylindrical bearing 4 made of synthetic resin attached therein. The support shaft 6 is fixed to a support member 8 on the VTR side, and has a flange (not shown) formed on its base end side, and a flange 1 on its top side to prevent the roller body 2 from being pulled out.
0 is press-fitted.

[Problem to be solved by the invention]

By the way, in such a guide roller, as shown in FIG. 5, the roller body 2 and the bearing 4 are formed separately, and by press-fitting the bearing 4 into the roller body 2, the roller body 2 and the bearing 4 are separated. are integrated. A support shaft 6 is inserted into the bearing hole 40 of the bearing 4, and the roller body 2 is rotatably supported by the support shaft 6 through the bearing 4. In order to enable rotation, the inner diameter of the bearing hole 40 of the bearing 4 and the outer diameter of the support shaft 6 are formed by different concentric circles with the former slightly larger, but the difference between the two is set to be extremely small. Therefore, the contact area between the bearing 4 and the support shaft 6 during rotation is large. When a magnetic recording tape is hung on such a guide roller, rotated, and guided, the position of the contact portion between the inner wall surface of the bearing hole 40 and the outer peripheral surface of the support shaft 6 changes depending on the tension of the magnetic recording tape. Therefore, irregular vibrations occur in the roller body 2, and these vibrations cause abnormal noises, so-called squealing, and unstable guidance of the magnetic recording tape. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a kite roller and a method for manufacturing the same, which reduce the contact area with the support shaft to prevent the generation of abnormal noise and stabilize the guidance of the transported object.

[Means to solve the problem]

That is, the guide roller of the present invention includes a roller body (2) that guides a transported object, a support shaft (6) installed on the central axis of the roller body, and a support shaft (6) fixed to the inner wall surface of the roller body. A bearing body (14A, 14B). Further, the method for manufacturing a guide roller of the present invention includes a step of forming a roller body (2) having a cylindrical shape, and a step of forming a support shaft (6).
The bearing part (
In the step of forming cylindrical bearing bodies (14A, 14B) having
4) of press-fitting.

[For production]

In the guide roller of the present invention, a bearing body is fixed to the roller body, and a bearing portion is formed on the bearing body in order to reduce the contact area with the support shaft that supports the roller body. The roller body is rotatably supported with respect to the support shaft via a bearing portion of a bearing body. Therefore, the roller main body is supported by the support shaft using a bearing portion having a reduced contact area, and fluctuations in the contact portion caused by the guided object are suppressed. As a result,
Irregular vibrations can be suppressed, abnormal noises can be prevented, and the transport of objects to be transported can be stabilized. Further, in the guide roller manufacturing method of the present invention, a cylindrical roller body is formed, and a bearing body to be fixed to this roller body is formed. The bearing body is formed with a bearing portion having a width narrower than that of the bearing body, that is, the contact area with the support shaft is narrowed, and a bearing hole is formed in the center of the bearing portion. Then, the bearing body is press-fitted from the open end of the cylindrical roller body, and the bearing body is fixed within the roller body. Therefore, according to the manufacturing method, a guide roller can be obtained in which the contact area between the bearing part of the bearing body fixed to the roller body and the support shaft is narrowed, and this guide roller can be used to transfer objects to be transferred. Fluctuations in the contact portion caused by this are suppressed, thereby preventing abnormal noise from occurring and stabilizing the transfer of the object to be transferred.

【Example】

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. FIG. 1 shows an embodiment of the guide roller of the present invention. The roller body 2 that guides the transfer of a belt-shaped object such as a magnetic recording tape has a guide surface 22 formed on its circumferential surface.
A through hole 24 of the same diameter is formed inside the cylinder to form a cylindrical body. The roller body 2 is made of metal such as brass or stainless steel, or hard plastic, depending on the nature of the object to be transported, and if the object to be transported is a magnetic recording tape, in order to prevent magnetic influence on the magnetic recording tape due to magnetization. etc. is formed. On the inner wall surface of the through hole 24 of the roller body 2, a pair of bearing bodies 1.4A and 14B are provided on each bearing portion 1.4A and 14B for smoothly supporting the roller body 2 on the support shaft 6 installed on the central axis thereof.
It is press-fitted with the 42 side facing the end. Each bearing body 1
4Δ and 14B form a cylindrical body concentric with the roller main body 2. In order to reduce the contact area with the support shaft 6, each bearing body 14A, 14B has a bearing portion 142 on one end side having a width of about a fraction of the length of each bearing body 14A, 14B. It is formed to occlude the Each bearing portion 142 includes a hollow portion 14 of the bearing body 14A, 14B.
6 has a disc-shaped protrusion, the center of which corresponds to the outer circumferential surface of the support shaft 6, which has a cylindrical shape with a perfect circle or a circle as close as possible to the perfect circle, that is, the circumferential surface. Bearing hole 1
44 is formed. Each bearing body 14A, 14B is made of, for example, hard synthetic resin in order to ensure smooth rotation by the support shaft 6. The support shaft 6 is fixed to a support member 8 on the VTR side, and supports the roller body 2 using the bearings 142 of the bearing bodies 14A and 14B attached to the roller body 2. A flange 10 (shown in FIG. 3) is press-fitted to prevent the support member 8 (!III) from coming off, and a flange 12 is formed on the support member 8 (!III). , the contact area between the inner wall surface of the bearing hole I44 of the bearing portion 142 and the support shaft 6 is narrowed.In this way, the contact area between the inner wall surface of the bearing hole 144 and the outer peripheral surface of the support shaft 6 is narrowed. Therefore, when a magnetic recording tape as an object to be transported is hung on the guide surface 22 of the roller body 2 and tension is applied to the bearing portion 142, the contact portion does not fluctuate due to the tension as in a conventional guide roller. In this case, since the bearing portion 142 is located at the upper and lower ends of the roller body 2, it is stably supported by the roller body 2 or the support shaft 6. Therefore, the occurrence of abnormal noise, so-called squealing, caused by the vibration of the roller body 2 is eliminated, and the guiding operation is stabilized.Next, FIG. An example is shown. As shown in FIG. The guide surface 22 and the through hole 24 to be formed at the center of the roller body 2 are formed in highly precise concentric circles.Next, a pair of bearing bodies 14 to be fixed to the roller body 2 are formed.
A and 14B are integrally formed by molding synthetic resin, for example, and have a bearing portion 142 and a bearing hole 14 at one end thereof.
form 4. In this case, each height of the bearing bodies 14A, 14B is set to be about half of the height of the roller body 2, and the heights of both are set to exactly match the height of the roller body 2. Next, when each bearing body 14A, 14B is press-fitted from the open end into the through hole 24 of the roller body 2 with the bearing portion 142 side facing outward, as shown in FIG. 2(B), the roller body 2
Each bearing body 14A, 14B is firmly fixed to. Next, as shown in FIG. 1, the support shaft 6 is inserted into the bearing hole 144 of each bearing portion 142 of the bearing bodies 14A, 14B, and the flange 10 is press-fitted into the top of the support shaft 6 to form a guide roller. Ru. According to such a manufacturing method, it is possible to extremely easily obtain a guide roller having a bearing portion 142 with a narrow contact area with the support shaft 6 on the end side of the roller body 2. In the embodiment, the height of each bearing body 14Δ, 14B is set to half the height of the roller body 2, and the height of each bearing body 14Δ, 14
Since the ends of the hollow portions 146 of B are joined inside the roller body 2, the positioning of both in the roller body 2 becomes highly accurate and easy, and the fixed state thereof is stabilized. In addition, in the embodiment, the bearing body 1 to be fixed to the roller body 2 is
4A and 14B, but as shown in FIG.
A and 14B may be used to form a guide roller. In addition, although the explanation has been given by taking a magnetic recording tape as an example of the object to be transported, the guide roller of the present invention can be used to transport a strip-like object other than a magnetic recording tape, which requires precision, and can be used to transport magnetic recording tape. It is not determined by the tape.

【Effect of the invention】

As explained above, according to the present invention, the following effects can be obtained. (a) Guy 1 of the present invention: According to the roller, the contact area between the bearing part of the bearing body fixed to the roller body and the support shaft is narrowed, so that the contact area does not fluctuate due to the tension acting on the roller body. The generation of irregular vibrations and abnormal sounds can be prevented, and the transportation of the object to be transported can be stabilized. (b) According to the method for manufacturing a guide roller of the present invention, the contact area between the bearing part of the bearing body fixed to the roller body and the support shaft is reduced, and the contact area changes due to the tension acting on the roller body. Therefore, it is possible to easily manufacture a guide roller that prevents the generation of irregular vibrations and abnormal sounds and stabilizes the transportation of objects to be transported.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing one embodiment of the guide roller of the present invention, Fig. 2 is a view showing a method of manufacturing the guide roller shown in Fig. 1, and Fig. 3 is another embodiment of the guide roller of the invention. FIG. 4 is a perspective view showing a conventional guide roller, and FIG. 5 is a cross-sectional view of the guide roller shown in FIG. 4. 2...Roller body 6...Support shafts 1.4A, 1.4B...Bearing body 24...Through hole 142...Bearing portion 144...Bearing hole (A) Funeral map figure

Claims (1)

[Claims] 1. A roller body that guides a transported object, a support shaft installed on the central axis of the roller body, and a support shaft fixed to an inner wall surface of the roller body and connected to an outer circumferential surface of the support shaft. A guide roller comprising: a bearing body that supports the roller main body on the support shaft in contact with the support shaft, and has a bearing portion that has a narrow contact area with the outer circumferential surface of the support shaft. 2. A step of forming a cylindrical roller body, a step of forming a cylindrical bearing body having a bearing portion formed in the center with a bearing hole that contacts the support shaft, and a step of forming a cylindrical bearing body through the roller body. A method for manufacturing a guide roller, comprising a step of press-fitting into a hole.