JPS6248578B2 - - Google Patents

Abstract

PURPOSE:To obtain a reinforcement ring for reproducing an information with no bubble at high working speed by sticking gradually a reinforcement ring to the edge part of the center hole of an elastic rotating body, while deforming said edge part of the center hole, after the reinforcement ring and the elastic rotating body have been respectively fitted onto two cylinders with common axis. CONSTITUTION:A reinforcement ring 18 and an elastic rotating body 26 are respectively fitted onto the centering first cylinder 12 and the centering second cylinder 14 which have common axis and are separated from the other in axial direction, and the reinforcement ring 18 is stuck onto the edge part of the center hole 28 in the elastic rotating body 26, while approaching the first cylinder 12 to the second cylinder 14. Then, the edge part of the center hole 28 in the elastic rotating body 26 is elastically deformed toward the other cylinder in the axial direction by either of the first cylinder 12 and the second cylinder 14, and the reinforcement ring 18 is gradually stuck outwardly from radial inner direction or inwardly from outer direction, thereby sticking the reinforcement ring 18 to the elastic rotating body 26 and reinforcing it.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for attaching a reinforcing ring to an elastic rotating body.

It is made of elastic material and has a center hole in its center.
2. Description of the Related Art An elastic rotating body is known in which a drive shaft is fitted into a center hole and rotated to reproduce recorded information. Examples of such an elastic rotating body include a floppy disk set in a computer storage device, etc., and a sonosheet set in a record player. In such an elastic rotating body, friction torque is transmitted from the drive shaft to the edge of the center hole, so there is a risk that the edge of the center hole may be damaged. Damage to the edge of the center hole makes it difficult to rotate the elastic rotating body uniformly, making accurate reproduction impossible.
Therefore, it has been considered and already practiced in foreign countries to reinforce the edge of the center hole by pasting a reinforcing ring around the center hole of the elastic rotating body.

Here, in order to uniformly reinforce the edge of the center hole, it is necessary to attach a reinforcing ring to the elastic rotating body coaxially with the center hole. It is also necessary to attach the inner edge of the reinforcing ring as close as possible to the edge of the center hole in order to sufficiently prevent damage to the edge of the center hole. Furthermore, if air bubbles are generated between the reinforcing ring and the elastic rotating body during attachment, the appearance will be spoiled and the product value will be reduced. Therefore, the reinforcing ring must be adhered to the elastic rotating body without creating any air bubbles.

For example, the reinforcing ring centering cylinder is inclined relative to the centering cylinder of the elastic rotating body, and the reinforcing ring is gradually attached to the edge of the center hole of the elastic rotating body from the lowest edge of the reinforcing ring. It has been known. In this method, the reinforcing ring is not attached all at once, but gradually from the lowest edge to the uppermost edge, so that the air between the reinforcing ring and the elastic rotating body can escape in the non-adhesive direction. Therefore, the generation of bubbles can be sufficiently prevented. However, if the cylinder for centering the reinforcing ring is tilted without tilting the cylinder for centering the elastic rotating body, it becomes difficult to center the reinforcing ring and the center hole of the elastic rotating body. Furthermore, if the centering cylinder of the elastic rotating body is tilted, centering becomes difficult and the pasting device becomes complicated. In any case, since centering is difficult, the bonding processing speed cannot be increased.

The object of the present invention is to provide a method for attaching a reinforcing ring to an elastic rotating body, which allows quick centering without producing bubbles.

In order to achieve this object, according to the present invention, the edge of the center hole of the elastic rotating body is elastically deformed by either the first or second cylinder in the axial direction toward the other cylinder. . Then, the reinforcing ring is gradually attached around the center hole of the elastic rotating body from the inside to the outside or from the outside to the inside in the radial direction.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, a pasting device 10 for carrying out the present invention includes first and second coaxial centering cylinders 12 and 14 spaced apart in the axial direction. The first cylinder 12 has a small-diameter protrusion 16 constituting a fitting portion, and a reinforcing ring 18 is fitted into the small-diameter protrusion by known means and abuts against the shoulder 20. On the other hand, a second cylinder 14 located below the first cylinder 12 is slidably housed in the pedestal 22 and biased in the direction of the first cylinder 12 by biasing means in the pedestal, such as a compression coil spring. . An elastic body 24 made of rubber or the like is disposed on the base 22, and the elastic rotating body 26 is fitted into the second cylinder 14 and positioned on the elastic body 24 by known means. The elastic body 24 is not limited to rubber, as long as it has elasticity that can allow deformation in the axial direction of the elastic rotating body, which will be described later. The tips of the first and second cylinders 12 and 14 are chamfered to facilitate fitting. Here, the relationship between the outer diameters R ₁ and R ₂ of the first and second cylinders and the inner diameter r of the center hole 28 of the elastic rotating body is as follows.

R ₁ >r > R ₂ However, the outer diameter R ₁ of the first cylinder is not set to an unlimited value, but is determined so that the edge of the center hole 28 of the elastic rotating body can be deformed within the elastic limit. Since r>R ₂ , the second
The elastic rotating body 26 fitted into the cylinder 14 is not deformed.

When the first cylinder 12 descends, the first cylinder 12 comes into contact with the second cylinder 14 . and the first
The cylinder 12 is moved to the second position against the biasing force of the biasing means.
Accompanied by the cylinder 14, it further descends. Here, since the outer diameter R ₂ of the second cylinder 14 is smaller than the inner diameter r of the center hole 28 of the elastic rotating body, the elastic rotating body 26 remains on the elastic body 24 without being deformed. When the first cylinder 12 descends together with the second cylinder 14, the small diameter fitting part 16 eventually comes into contact with the edge of the center hole 28, and as the small diameter fitting part descends, the elastic rotating body moves in the axial direction toward the second cylinder. The edge of the center hole is deformed (see Figure 2B). Elastic rotating body 26
The elastic body 24 supporting the is made of a material that allows this deformation of the elastic rotating body. This deformed state of the elastic rotating body 26 is the first piston 12
As the first piston further descends, the reinforcing ring 18 and the radially outer portion of the elastic rotating body 26 having a small amount of deformation first come into line contact and stick together. Thereafter, as the first piston 12 descends, the line contact between the reinforcing ring and the elastic rotating body moves from radially outward to inward, and the adhesion gradually progresses (see FIG. 2C).

As described above, according to the present invention, the edge of the center hole 28 of the elastic rotating body is elastically deformed in the axial direction by the first cylinder in the direction of the second cylinder, and the reinforcing ring 18 is gradually expanded from the outer side to the inner side in the radial direction. It is attached. In such an adhesion direction, the adhesion is gradually performed in a fixed direction, that is, from the outside to the inside in the radial direction, so that the reinforcing ring 18 and the elastic rotating body 26
Air between them escapes radially inward and is not captured. Therefore, the generation of bubbles during adhesion is completely prevented. Furthermore, since the first and second cylinders 12 and 14 do not need to be tilted relative to each other and are arranged coaxially, centering is facilitated.

The elastic body 24 not only allows the elastic rotary body 26 to deform, but also has the function of guiding the first cylinder 12 to gradually and reliably attach the first cylinder 12 until it reaches a predetermined lowest point.

Upon reaching the lowest point, the first cylinder 12 rises and the biasing force of the biasing means causes the second cylinder 14 to rise.
also rises while contacting the first cylinder and returns to the initial position shown in FIG. As the first cylinder 12 rises, the elastic rotating body 26 deforms in the axial direction toward the first cylinder, as shown in FIG. 2D. It goes without saying that this deformation is also within the elastic limit, similar to the deformation when the first cylinder is lowered. The deformation of the elastic rotating body 26 shown in FIG. 2D presses the elastic rotating body against the reinforcing ring 18, thereby making the adhesion between them even more reliable.

In the above-mentioned pasting device, pasting is performed gradually from the outer side to the inner side in the radial direction. However, it is also possible to apply the adhesive radially from the inside to the outside.
The pasting device 110 shown in FIG. 3 performs pasting from the inside to the outside in the radial direction, and by adding 100 to the reference numerals of the corresponding components of the pasting device 10 shown in FIG. The structural members of the pasting device 100 are shown. The pasting device 110 differs from the pasting device 10 described above in two major respects. The first difference is in the configuration of the first cylinder 112,
A small diameter protrusion 116 is formed separately from the first cylinder body 13, and as the first cylinder body descends, the small diameter protrusion also descends, but comes into contact with the second cylinder 114 and stops. Here, the second cylinder 114 is arranged to act as a stop for the small diameter projection 116. The second difference lies in the relationship between the small diameter protrusion 116 of the first cylinder 112 and the outer diameters R ₁₀₁ and R ₁₀₂ of the second cylinder 114 and the inner diameter r ₁₀₀ of the center hole of the elastic rotating body. In other words, the following relationship exists in the pasting device 110.

R ₁₀₂ >r ₁₀₀ , R ₁₀₁ There is no particular size relationship between r ₁₀₀ and R ₁₀₁ because the small diameter protrusion 116 comes into contact with the second cylinder 114 and stops. It goes without saying that the outer diameter R ₁₀₂ of the second cylinder is determined so that the edge of the center hole 128 of the elastic rotating body can be deformed within the elastic limit.

Since R ₁ >r, when the elastic rotating body 126 is fitted into the second cylinder 114, the edge of the center hole becomes elastic in the axial direction toward the first cylinder 112, as shown in FIGS. 3 and 4A. It transforms and remains in this state.

When the first cylinder 112 is lowered, the small diameter protrusion 116 comes into contact with the second cylinder 114 and stops. However, the first cylinder body 13 continues to descend further, and as shown in FIG.
18 are first in line contact and pasted. Then the first
As the cylinder body 13 descends, the line contact between the reinforcing ring and the elastic rotating body moves from radially outward to inward, and the adhesion gradually progresses. Even when pasting is performed from the inside to the outside in the radial direction, the generation of air bubbles is completely prevented, as in the pasting device 10.

When a predetermined descending point is reached, the first cylinder 112 rises, and at the same time as the first cylinder rises or thereafter, the second cylinder 114 descends and the elastic rotating body 11
6 is released from the second cylinder. When the second cylinder 114 descends, as shown in FIG. 4C,
The elastic rotating body 126 deforms in the axial direction toward the second cylinder. This deformation acts to cause the elastic rotating body 126 to separate from the reinforcing ring 118, but as a result of experiments, separation hardly occurs and there is no problem in practice.

When pasting is performed from the outside in the radial direction to the inside as shown in Figures 2A to 2D, four steps are required, whereas in the pasting method shown in Figures 4A to 4C, there are three steps. Since it is sufficient, the speed of adhesion processing can be increased.

As described above, according to the present invention, a reinforcing ring and an elastic rotating body are respectively fitted to the coaxial first and second centering cylinders spaced apart in the axial direction, and the first and second cylinders are brought close to each other so that the elastic In a method for attaching a reinforcing ring to an elastic rotating body in which a reinforcing ring is attached around a center hole of a rotating body, the edge of the center hole of the elastic rotating body is attached to the axis by either the first or second cylinder. The reinforcing ring is gradually attached from the inside to the outside or from the outside to the inside in the radial direction by elastically deforming the reinforcing ring in the direction of the other cylinder.

In such a method, the air between the reinforcing ring and the elastic rotating body is not trapped and can escape, thereby preventing the generation of air bubbles. Furthermore, since the first and second cylinders are not inclined relative to each other, centering is facilitated.

The above embodiments are for illustrating this invention and are not intended to limit this invention in any way, and all modifications and modifications within the technical scope of this invention are also included in this invention. Needless to say. For example, in the embodiment, the first cylinder is lowered, but the second cylinder may be raised together with the base and the elastic body.

[Brief explanation of the drawing]

1 and 3 are schematic partial front views showing a pasting device for carrying out the present invention, and FIG.
Figures A to 2D and Figures 4A to 4C
The figure is a diagram of the pasting process in each pasting device. 10,110... pasting device, 12,112... first
Cylinder, 14, 114...Second cylinder, 16,
116... Small diameter protrusion, 18, 118... Reinforcement ring, 22, 122... Pedestal, 24, 124... Elastic body, 26, 126... Elastic rotating body, 28, 128...
Center hole of elastic rotating body.

Claims (1)

[Claims] 1 Fit a reinforcing ring and an elastic rotating body to the coaxial first and second centering cylinders that are spaced apart in the axial direction, and bring the first and second cylinders closer together to reinforce around the center hole of the elastic rotating body. In a method for attaching a reinforcing ring to an elastic rotating body to which a ring is attached, the edge of the center hole of the elastic rotating body is moved in the axial direction toward the other cylinder by either the first or second cylinder, A method for attaching a reinforcing ring to an elastic rotating body, which comprises elastically deforming the reinforcing ring and gradually attaching the reinforcing ring from the inside to the outside or from the outside to the inside in the radial direction.