JPH07247043A - Web rewinding device - Google Patents

Abstract

PURPOSE:To eliminate the occurrence of a winding failure caused by the repetition of contact and separation of a roll coming in pressure contact with a rewinding roll or plastic deformation caused by striking the peripheral surface of the roll in a rewinding device for rewinding a web again into roll shape after cutting both ends of the web delivered from a web roll. CONSTITUTION:A web rewinding device has a rewinding roll 8 rotatory-driven by a rewinding shaft 9. An elastic roller 5 is brought into pressure contact with the rewinding roll 8 to wind a web W. The elastic roller 5 has a rubber elastic layer 17 on the peripheral surface of a roller core 16, and the outer peripheral surface is covered with a roller cylinder 18 made of metal. The displacement on the verge of being caused to the elastic roller 5 by the fluctuation of contact pressure between the elastic roller 5 and the rewinding roll 8 is absorbed by the resilience of the elastic layer 17, so that the elastic roller 5 can be always kept in external contact with the rewinding roll 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web rewinding apparatus suitable for winding a foil or a web laminated with a foil and having no elasticity and being easily plastically deformed.

[0002]

2. Description of the Related Art For example, in the process of manufacturing an aluminum foil, while rewinding an original roll of foil,
In the meantime, both ends of the web may be cut to adjust the width of the web, or the presence or absence of wrinkles or tears on the web may be finally checked. In the conventional rewinding device of this type, as shown in FIG. 4, the touch roller 31 is pressed against the rewinding roll 30 to rewind. The rewinding roll 30 includes the winding core 3
It is rotationally driven via 2, and the roll support base 33 can move to the side away from the touch roller 31 as the roll diameter increases. The touch roller 31 is rotationally driven at the same peripheral speed as the rewinding roll 30, its central axis is supported by a swing arm 34, and the arm 34 is supported by an air cylinder 35.
By touching the rewind roll 30 with the touch roller 31, the touch roller 31 is pressed against the rewind roll 30.

[0003]

As described above, in the rewinding device in which the center positions of the rewinding roll 30 and the touch roller 31 are not fixed, the contact pressure between the two rewinding rolls 30 and 31 constantly fluctuates. The touch roller 31 repeats contact and separation with respect to the rewinding roll 30,
The density of the winding layer may vary, or the peripheral surface of the roll may be beaten by the touch roller 31 and may be plastically deformed, and the foil quality may be significantly impaired. In particular, when the rewinding speed is high, the separating stroke of the touch roller 31 may become abnormally large, and the touch roller 31 may fall into a state where it cannot be wound.

The present inventor has examined the use of an elastic roller as a touch roller in order to prevent such roller jump. That is, by using an elastic roller having a rubber layer on the outer peripheral surface, the rubber layer absorbs the fluctuation of the contact pressure with respect to the rewinding roller so that the touch roller can always be in close contact with the rewinding roller. As a result of trial use of this touch roller, defective winding of the foil and plastic deformation due to the jump of the roller could be eliminated. However, since the rubber layer is constantly in pressure contact with the rewind roll that is tightly wound, the peripheral surface of the rubber layer was dented and deformed to the same width as the roll in a short time, and we found that there was a problem with durability. . That is,
There is a problem when the rubber layer is exposed.

Therefore, an object of the present invention is to absorb the jump of the elastic roller by the elastic deformation of the roller itself when the web is wound up to eliminate the winding failure and the plastic deformation of the web due to the jump of the roller, and further to ensure the sufficient durability. In order to obtain a web rewinding device having good properties.

[0006]

The present invention is directed to an original roll 1
Rewinding shaft 9 for rewinding the web W unwound from the web
And an elastic roller 5 pressed against the rewinding roll 8 supported by the rewinding shaft 9, and the rewinding shaft 9 and the elastic roll 5 are provided.
In the web rewinding device, each of which is supported so that it can come into contact with and separate from each other, and is rotationally driven in the web winding direction,
The elastic roller 5 includes a roller core 16, an elastic layer 17 fixed to the peripheral surface of the roller core 16, and a metal roller cylinder 18 covering the outer peripheral surface of the elastic layer 17. The elastic layer 17 can be formed into a cylindrical shape by using at least one material selected from natural rubber, synthetic rubber and foamed plastic material.

[0007]

In the use state, the elastic roller 5 is in pressure contact with the peripheral surface of the rewinding roll 8, and the contact pressure between the both 5 and 8 causes the rewinding shaft 9 to move as the roll diameter increases, and the elastic roller 5 moves. It constantly fluctuates due to the contact and separation follow-up operation. The displacement of the elastic roller 5 due to this pressure fluctuation is absorbed by the compressive deformation of the elastic layer 17 and the return to the free state. The metal roller cylinder 18 on the outer peripheral surface of the elastic roller 5 transmits the contact pressure acting on the elastic roller 5 to the elastic layer 17 in an evenly distributed state, and prevents the elastic layer 17 from being plastically deformed.

[0008]

According to the present invention, the elastic roller 5 is pressed against the rewinding roll 8 to rewind the web W.
Even if the elastic roller 5 is displaced due to the fluctuation of the contact pressure between the rewinding roll 8 and the elastic roller 5, the elastic layer 17 of the elastic roller 5 absorbs the displacement, whereby the roller jump can be eliminated. This eliminates winding irregularities such as variations in the density of the winding layer and defective winding due to the jump of the roller, and further reliably prevents the peripheral surface of the roll from being beaten by the roller and plastically deformed, and The web W with the foil laminated can be preferably unwound. Since the elastic roller 5 has the elastic layer 17 on the inner surface of the metal roller cylinder 18, the elastic layer 5 is plastically deformed by the pressure contact reaction force even though the elastic roller 5 is constantly in pressure contact with the rewinding roll 8. This can be solved and the durability of the elastic roller 5 can be sufficiently improved.

[0009]

1 to 3 show an embodiment of a web rewinding device according to the present invention. In FIG. 2, the web rewinding device has a feeding table 2 that supports the original roll 1, and a rewinding machine 3. The rewinding machine 3 is equipped with a large number of roll groups for guiding the web W fed from the original roll 1, and cuts the web W at both ends in the width direction at a midway portion of the transfer path. A rotary type cutter 4 for adjusting is arranged. As shown in FIG.
The elastic roller 5, the nip roller 6, and the guide roller 7 are arranged as shown in FIG. 3, and the rewinding roll 8 and the rewinding shaft 9 that rotationally drives the roll 8 via the winding core 8a are arranged on the lateral side of the elastic roller 5. Has been done.

In FIG. 3, the elastic roller 5, the nip roller 6, and the guide roller 7 are pivotally supported by a pair of front and rear swing arms 10. The swing arm 10 is moved by a double-acting air cylinder 11. By urging, the elastic roller 5 can be pressed against the rewinding roll 8 with a constant pressure. Reference numeral 12 is a swing shaft of the swing arm 10. Only the nip roller 6 is rotatably supported, and the elastic roller 5 and the guide roller 7 are rotationally driven in the web W moving direction. The web W passes between the nip roller 6 and the elastic roller 5, is guided by the upper guide roller 7, is then inverted downward, and is wound up by the rewinding roll 8. Guide roller 7 provided above elastic roller 5
Is provided in order to prevent air from being trapped when the web W is wound around the rewinding roll 8.

The rewinding shaft 9 and its drive mechanism are provided on a roll support 14. The roll support base 14 is a guide body 15.
Can be slid to the left and right along the rewind roll 8
With the increase of the roll diameter, the elastic roller 5 can be moved to the side away from the elastic roller 5 (to the right in the figure). 2 and 3 show the unwinding roll 8 in the fully wound state in phantom lines. In FIG. 3, reference numeral 20 is a shaft holding frame for pressing and holding the rewinding shaft 9, and 21 is an air cylinder for swinging and opening and closing the shaft holding frame 20. After swinging the shaft pressing frame 20 open clockwise, the rewinding roll 8 in the fully wound state is taken out of the machine.

In FIG. 1, the elastic roller 5 includes a roller core 16 made of steel, an elastic layer 17 fixed to the peripheral surface of the roller core 16, and a roller cylinder 18 made of steel covering the outer peripheral surface of the elastic layer 17. It consists of. The elastic layer 17 is made of at least one of natural rubber, synthetic rubber, and foamed plastic material. Preferably, a natural rubber sheet is wound around and fixed to the roller core 16 to form a cylindrical shape. The elastic roller 6 in the example has an outer diameter of 90 mm, an effective roll width of 1300 mm, and a layer thickness of the elastic layer 17 of 8 to 12 mm. The roller cylinder 18 has a thickness of 3 to 10 mm, preferably 5 to 8 mm, and a hard chrome plating layer is formed on the surface of the cylinder. The elastic modulus of the rubber forming the elastic layer 17 is appropriately changed according to the specific gravity and elastic modulus of the web W, the rewinding speed, or the like.

As a material for forming the web W to be unwound by the above unwinding device, a single web of various foils of aluminum, copper, tin or the like, or a composite web obtained by laminating the foil on paper or a plastic film is used. Is mentioned. The elastic layer 17 may be formed in a cross-sectional shape such as a spline shaft shape or a petal shape, instead of having a cylindrical cross section. If necessary, a spring wire material or a spring plate material can be insert-fixed in the rubber layer.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a main part.

FIG. 2 is an overall schematic front view.

FIG. 3 is an enlarged front view of a portion A in FIG.

FIG. 4 is a schematic front view of a main part for explaining a conventional rewinding mechanism.

[Explanation of symbols]

 1 Original roll 5 Elastic roller 8 Rewinding roll 9 Rewinding shaft 16 Roller core 17 Elastic layer 18 Roller tube

Claims (2)

[Claims] 1. A web W unrolled from an original roll 1.
A rewinding shaft 9 for rewinding the rewinding roller and an elastic roller 5 pressed against the rewinding roll 8 supported by the rewinding shaft 9 are provided, and the rewinding shaft 9 and the elastic roll 5 can contact and separate from each other. A rewinding device which is supported by a roller and is rotatably driven in the web winding direction, in which an elastic roller 5 includes a roller core 16, an elastic layer 17 fixed to the peripheral surface of the roller core 16, and an elastic layer 17. A web rewinding device comprising a metal roller cylinder 18 covering an outer peripheral surface. 2. The web rewinding device according to claim 1, wherein the elastic layer 17 is formed in a cylindrical shape from at least one of natural rubber, synthetic rubber and foamed plastic material.