JPS5845343B2 - Method for manufacturing rubber rollers for spinning, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a spinning rubber roller such as a gill roller,
This invention relates to a method for manufacturing rubber rollers with iron cores used for office equipment such as copying machines, and for various other uses.

Conventionally, this type of rubber roller has generally been manufactured by fitting a vulcanized or unvulcanized rubber cylinder to an iron core via an adhesive, and vulcanizing and polishing the cylinder as necessary.

However, when this manufacturing method is used, it is generally difficult to expect a sufficiently strong adhesive bond between the rubber tube and the iron core, and especially when the rubber tube and the iron core are used under harsh conditions, the rubber tube and the iron core may be bonded together. There was that incident where I got separated.

Not only that, but since the rubber cylinder is directly bonded to the iron core, the diameter and surface precision of their contact surfaces directly affect the finishing accuracy of the rubber roller, and for this reason, they must be finished with high precision in advance. There were manufacturing problems such as this, and manufacturing efficiency was poor.

The present invention aims to solve the above-mentioned problems and provide a method for manufacturing rubber rollers with high efficiency and high precision.

For the above purpose, the present invention has a truncated cone-shaped lower support having a vertical hole in the center and a tapered peripheral surface, and the lower end of the iron core is inserted into the vertical hole to make the iron core stand upright. , and the iron core is covered with a rubber cylinder having an inner diameter larger than the diameter thereof, and the inner peripheral edge of the lower end thereof is supported on the tapered peripheral surface of the lower support and arranged concentrically with the iron core, and then A hardening type filling liquid made of rubber or synthetic resin thread is injected into the gap between the iron core and the rubber cylinder, and at least during the process before the filling liquid hardens, an inverted conical shape symmetrical to the lower support is formed. A trapezoidal upper support is placed so that the upper end of the iron core passes through the central vertical hole and the inner peripheral edge of the upper end of the rubber cylinder is in contact with the tapered peripheral surface, and in this state, the filling liquid is allowed to harden. The present invention relates to a method of manufacturing a rubber roller, characterized in that the rear upper and lower supports are removed.

The upper and lower supports used in this invention are made of metals such as iron and stainless steel, or synthetic resins such as polyamide resin, ABS resin, phenol resin, polyolefin resin, and Teflon resin. A release agent such as silicone oil is preferably applied to the surface to facilitate removal after curing.

Furthermore, these upper and lower supports do not necessarily have to be of the same shape; in particular, the lower support may be provided with a fixing part on the lower surface of its truncated conical part, and may also be made of iron. A tightening screw or the like may be attached to secure the core.

Furthermore, a backing may be attached to the vertical hole of the support to make the space between the support and the iron core liquid-tight.

On the other hand, the hardening type filling liquid to be injected and filled between the iron core and the rubber cylinder is a synthetic resin based liquid resin such as epoxy resin or polyurethane resin, and a rubber based liquid resin such as butadiene rubber or styrene rubber. Liquid rubber or rubber solution such as butadiene rubber, acrylonitrile butadiene rubber, urethane rubber, polysulfide rubber, etc. is used.

The upper support may be attached after the filling liquid is injected and before it hardens, or, if necessary, before the filling liquid is injected.

In the latter case, the upper support is provided with a groove or hole for injecting the filling liquid.

Next, the present invention will be further explained based on the drawings.

In FIGS. 1 and 2, the lower support 1 has a vertical hole 4 in the center having a diameter slightly larger than the diameter of both ends of the iron core 3.
It has a hollow truncated conical shape with a circumferential surface 5 extending to the upper end, thus a tapered shape with a small diameter, and an annular backing 6 is attached to the inner circumferential surface of one end of the vertical hole 4. There is.

First, the lower end of the iron core 3 is inserted into the vertical hole 4 of the lower support 1, and while the backing 6 maintains liquid tightness between the two, the downward protruding portion of the iron core 3 is fixed with the fixing jig 7. Secure it by clamping it and support it in an upright position.

At the same time, a vulcanized or unvulcanized rubber tube 8 is fitted onto the outside of the iron core 3.

This rubber tube 8 has an inner diameter larger than the diameter of the iron core 3, and a required gap 9 is formed between its inner surface and the iron core 3, and the inner peripheral edge of the lower end of the rubber tube 8 is supported by the lower part. It is carried and supported on the tapered peripheral surface of the tool 1, so that its center line coincides with that of the iron core 3, and it is made to stand upright.

Next, a time curing type or thermosetting type filling liquid 10 is injected into the gap 9 from the upper end thereof.

When this filling is completed, next, an inverted truncated cone-shaped upper support 2, which has the same shape as the lower support 1 but is vertically symmetrical, is fitted by inserting the upper end of the iron core 3 into the central vertical hole 4. , the upper inner peripheral surface of the rubber tube 8 is placed in contact with the tapered peripheral surface 5, as shown by the chain line in FIG.

As a result, the entire length of the rubber cylinder 8 can be reliably maintained concentrically with the iron core 3, so in this state, the filling liquid 10 is allowed to harden to integrate the iron core 3 and the rubber cylinder 8, and then the upper and lower parts are Both supports 1゜2 are removed, and if necessary, both ends of the rubber tube 8 are cut and shaped, and if it is an unvulcanized rubber tube 8, it is vulcanized, and the surface is polished to complete the rubber roller. .

In the above, after the filling liquid 10 is injected and filled, the upper support 2
However, if an upper support 12 with injection grooves 13 or holes provided inside or on the outer circumferential surface is used as shown in Fig. 3, it must be installed in a predetermined position beforehand. , the filling liquid may be injected and filled through the injection groove 13 or the like.

As described above, this invention covers the outer periphery of the iron core with a rubber cylinder having an inner diameter larger than the diameter of the iron core, and injects and fills the gap between the rubber cylinders with a hardening type filling liquid, which is then cured to form the entire body. Since it is integrally molded, all manufacturing steps are simple, and mass productivity can be greatly improved compared to conventional manufacturing methods.

In addition, even if there are slight variations in precision on the outer surface of the iron core and the inner surface of the rubber tube, the surface precision of the product will not deteriorate due to this, improving manufacturing efficiency and yield. During the process before the filling liquid hardens, the rubber cylinder has its upper and lower ends brought into contact with the tapered peripheral surfaces of the upper and lower supports fitted in the iron core, and the filling liquid is cured in this state. The axes of the iron core and the rubber cylinder can be perfectly aligned, and a highly accurate rubber roller can be manufactured with extremely simple operations.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially fragmented front view showing the state in which the upper support is being installed after the filling liquid has been injected and filled, and FIG. 2 is a half-cut front view of the lower support. , FIG. 3 is a vertical sectional view of a main part of another embodiment. 1...Lower support, 2...Upper support, 3...Iron core, 4...Vertical hole, 5...
... Tapered peripheral surface, 6 ... Backing, 8
...Rubber tube, 9...Gap, 10...
...Filling liquid.

Claims (1)

[Scope of Claims] 1. A lower end of an iron core is inserted into the vertical hole of a truncated conical lower support having a vertical hole in the center and a tapered peripheral surface, and the iron core is made to stand upright. is covered with a rubber cylinder having an inner diameter larger than the diameter of the rubber cylinder, and its lower end inner peripheral edge is supported on the tapered peripheral surface of the lower support and placed concentrically with the iron core. In addition to injecting and filling a rubber or resin-based hardening type filling liquid into the gap with the inner surface of the cylinder, at least during the process before the filling liquid hardens, an upper support member having an inverted truncated conical shape that is symmetrical to the lower support member is provided. The upper end of the iron core is passed through the central vertical hole, and the inner peripheral edge of the upper end of the rubber cylinder is placed in contact with the tapered peripheral surface, and in this state, the filling liquid is allowed to harden, and both the upper and lower supports are assembled. A method of manufacturing a rubber roller for spinning, etc., characterized by removing the roller. 2. A method for manufacturing a rubber roller for spinning, etc., as set forth in claim 1, characterized in that an epoxy resin is used as the filling liquid. 3. A method for manufacturing a rubber roller for spinning, etc., as set forth in claim 1, characterized in that urethane rubber is used as the filling liquid.