JPH08206574A - Strip supporting method for lift roll - Google Patents

Abstract

PURPOSE: To make it possible to suppress a tension fluctuation by making a lift roll of a roll coater circularly movable and attaching and detaching a strip to and from the roll coater by the circular motion of the lift roll. CONSTITUTION: The strips S come into contact with the applicator roll 16a of the roll coater 16, by which the rear surface of the strips S are coated while the lift roll 1 exists in a solid line position. The juncture (joint) (b) of the strips S arrives in this state at a prescribed position, for example, at the upstream point (a) of a support roll 15. A cylinder 9 is actuated to extend and the lift roll 1 is turned α deg. clockwise when the arrival at the point is detected. As a result, the lift roll 1 is risen by Y in a perpendicular direction and is moved by X in a horizontal direction as shown by an alternate long and two short dashes line, by which the strips S are parted from the roll coater 16. The transfer of the strips S without bringing the juncture (b) thereof into contact with the applicator roll 16a is made possible and a tension fluctuation is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of supporting a strip of a lift roll in which the height of the lift roll is changed to bring the strip into contact with or separate from the roll coater.

[0002]

2. Description of the Related Art In recent years, in continuous strip coating lines, there has been a tendency to coat near strip connection portions in order to improve the yield of products. However, if the strip connection passes through the roll coater as it is, the connection will damage the roll. Therefore, a lift roll that can move up and down is provided on the upstream side of the roll coater,
When the lower surface coater is a fixed double-sided coater, when the strip connecting portion passes a predetermined position, the upper surface coater is first lifted and separated from the strip, and then the lift roll is lifted to lift the strip. The strip is separated from the lower surface coater so as to pass through the connection portion of the strip, and then the strip is brought into contact with the roll by the above-mentioned reverse operation to apply the coating. When only the lower surface coater is used, it is sufficient to move the lift roll up and down. Further, when the upper surface coater of the double-sided coater is a fixed type or when the upper surface coater is only the upper surface coater, the lift roll is provided above the strip and the strip is pushed down to perform the same operation as described above.

[0003]

In the roll coater, bridle rolls are installed at predetermined positions upstream and downstream of the coater to apply a constant tension to the strip and to control the tension. However, as described above, when the strip is pressed by the lift rolls, the tension varies because the length of the strip between the bridle rolls changes substantially. Therefore, it is necessary to control the rotation speed of the bridle roll to control the tension set in advance. However, since the bridle roll also serves as the adjacent section, if the tension varies in one section, the coating line will be changed. Since it affects each part, it is necessary to adjust the tension of the entire coating line, and it takes time to adjust the tension, making stable coating impossible. Therefore, as a method of suppressing the tension fluctuation, the lifting speed of the lift roll is reduced to such an extent that the control of the bridle roll can follow the tension fluctuation, or the lifting roll is not decreased in speed, and a sufficient distance between the bridle rolls is set. There is a way.

However, the former method has a problem that the non-coating time is long and the yield is poor, and the latter method has a problem that the coating line is long and the equipment is large. SUMMARY OF THE INVENTION It is an object of the present invention to provide a lift roll strip supporting method capable of solving the above problems by changing the operation of the lift roll from a vertical movement to an arc movement.

[0005]

In order to achieve the above-mentioned object, the present invention provides a method for supporting a strip of a lift roll provided on a roll coater, wherein the lift roll is provided so as to be capable of performing an arcuate movement, and in the vicinity of the lift roll. Further, a support roll for changing the transport level of the strip is provided on the upstream side, and the strip is brought into contact with or separated from the roll coater by the circular motion of the lift roll.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, T is a lift roll device,
It comprises a lift roll 1, a roll arm 2, a shaft 5, a cylinder 9, a cylinder arm 11 and the like. The lift roll 1 presses the lower surface of the strip S as described below, and both ends of the roll are rotatably attached to one end of an L-shaped roll arm 2 via bearing units 3. .

The other end of the roll arm 2 is a bearing unit 6 having both ends provided on the side plate 13 of the base 12.
The shaft 5 is rotatably attached to the shaft 5 and is fixed by a key 7 or the like. A bracket 8 is provided outside the side plate 13.
A cylinder 9 is swingably attached via a cylinder rod 10, and its cylinder rod 10 is rotatably connected to the other end of a cylinder arm 11 whose one end is fixed to the end of the shaft 5. In addition, 4 is a reinforcing member provided between the roll arms 2 and 2, and 14 is a stopper which is attached to the side plate 13 and regulates a rotation range of the cylinder arm 11.

Next, a method of supporting the strip S using the lift roll device T will be described. A support roll 15 is arranged below the lift roll 1 of the lift roll device T, and the strip S is attached to the support roll 15.
It is wound around and moved upward, and the lower surface is supported by the lift roll 1. That is, the strip S is wound around the lift roll 1 by about 90 ° and conveyed in the horizontal direction. In addition, a predetermined position upstream and downstream of the strip S is supported by a bridle roll (not shown). The roll coater 16 is a lift roll device T
Is disposed on the downstream side of the.

Now, the roll coater 16 is a back coater,
When the lift roll 1 is fixed and the lift roll 1 is in the solid line position, the strip S is applied to the applicator roll 1 of the roll coater 16.
The back surface of the strip S is painted in contact with 6a. When the connecting portion (seam) b of the strip S reaches a predetermined position, for example, the upstream point a of the support roll 15, this is detected, the cylinder 9 is driven to extend the cylinder rod 10, and the lift roll 1 Is rotated about the shaft 5 in the clockwise direction by α °. As a result, FIG.
As indicated by a chain double-dashed line, the lift roll 1 moves in the vertical direction by Y and the pass line P of the strip S also rises by Y, while the lift roll 1 moves in the horizontal direction by X, and the strip S moves in the roll coater. Separated from 16. Therefore, the connecting portion b passes without contacting the applicator roll 16a. This connection part b is the roll coater 1
6 is detected, or after a lapse of a predetermined time from the detection of the connecting portion b, the cylinder 9 is driven again to reduce the cylinder rod 10, and the cylinder arm 11 is pressed against the stopper 14 to lift. The coating of the strip S is restarted with the roll 1 at the original position.

Here, as shown in FIG. 3, the distance between the lift roll and the bridle roll during coating is A, the distance between the lift roll 1 and the support roll 15 is B, and the rotation angles of the strip S are β and γ, respectively. Then, the displacement amounts of the strip length in the vertical direction and the horizontal direction are (Equation 1) and (Equation 2).

[Equation 1] (B + Y) / cos β-B

(A−X) / cos γ−A At this time, since the movement amounts X and Y of the lift rolls are sufficiently small with respect to the distances A and B, approximately cosβ =
1, cos γ = 1, and the displacement amount of the strip length in the vertical direction and the horizontal direction can be approximated by X and Y. That is, if the amount of movement Y in the vertical direction and the amount of movement X in the horizontal direction are equal, the amount of change in the vertical direction is absorbed by the amount of change in the horizontal direction, and the strip length between the bridle rolls does not change, since not occur even tension fluctuation, if straight line movement the lift rolls 1 a connecting the center C ₁ and the center C ₂ of the rotation ending when the lift roll 1 of the lift roll 1 during painting, the length of the strip fluctuates Will not do. However, since the lift roll 1 makes an arc motion and theoretically varies in length a little, it is desirable to separate the center position of the arc motion (position of the shaft 5) from the lift roll 1. In reality, since there is a space problem, the center position (the position of the shaft 5) is set at a predetermined position where the fluctuation of the strip length is less than the detection accuracy of the tension fluctuation.

In the above description, the roll coater 16 that coats only the back surface of the strip S is used, but the movable surface coater that coats the surface of the strip S facing the roll coater 16 on the back surface is used. When coating the front and back surfaces of the strip S, the front coater may be retracted upward prior to the rotation of the lift roll 1. Further, when the surface coater of the double-sided coater is a fixed type, or when only the surface coater is used, the arc motion of the lift roll 1 may be in the opposite direction (counterclockwise direction) to the above description.

In any of the above cases, since the coating line is once conveyed upward by the support roll 15,
A sufficient maintenance space for the surface coater can be secured near the support roll 15. In addition, although the said Example demonstrated the case where the support roll 15 was provided below the vicinity of the lift roll 1, as shown in FIG.
Even when the support roll 15 is provided near and above the lift roll 1, tension fluctuation can be suppressed in the same manner as described above by appropriately selecting the rotation direction of the lift roll 1.

[0013]

As is apparent from the above description, since the present invention changes the height of the pass line of the strip by causing the lift roll to perform an arc motion, the lift roll is different from the conventional vertical movement. , Move vertically and horizontally. Therefore, in order to absorb the amount of change in the path length in the vertical direction by the amount of change in the horizontal direction, by setting the arc movement center of the lift roll and its movement range to a predetermined value,
The amount of change in the path length can be brought close to substantially zero, and tension fluctuation can be suppressed.

[Brief description of drawings]

FIG. 1 is a front view of a lift roll device to which the present invention is applied and its vicinity.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is an explanatory view of the principle of the present invention.

FIG. 4 is a conceptual diagram showing another embodiment.

[Explanation of symbols]

T ... Lift roll device, b ... Connection part, S ... Strip,
1 ... lift roll, 2 ... roll arm, 5 ... shaft,
9 ... Cylinder, 11 ... Cylinder arm, 15 ... Support roll, 16 ... Roll coater.

Claims (1)

[Claims] 1. A method for supporting a strip of a lift roll provided on a roll coater, wherein the lift roll is provided so as to be capable of circular arc movement, and a support roll for changing the strip transport level is provided in the vicinity of the lift roll and upstream. A method for supporting a strip of a lift roll, wherein the strip is brought into contact with and separated from a roll coater by an arc motion of the lift roll.