JP2698554B2 - Lift roll strip support method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supporting a strip of a lift roll in which a strip is brought into contact with or separated from a roll coater by changing the height of the lift roll.

[0002]

2. Description of the Related Art In recent years, in a continuous strip coating line, there has been a tendency to coat a portion near a connecting portion of a strip in order to improve product yield. However, if the connection of the strip 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 upstream of the roll coater,
When the lower surface coater is a fixed double-sided coater, when the connection portion of the strip passes a predetermined position, the upper surface coater is first raised to separate from the strip, and then the lift roll is raised to lift the strip. The strip was separated from the lower surface coater and passed through the connecting portion of the strip, and thereafter, the strip was brought into contact with the roll by the reverse operation to apply the coating. In the case where only the lower surface coater is used, only the lifting roll needs to be moved up and down. Further, when the upper surface coater of the double-side coater is fixed or only the upper surface coater is used, a lift roll is provided above the strip, and the strip is pushed down, thereby performing the same operation as described above.

[0003]

In a 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 roll, the tension fluctuates because the length of the strip between the bridle rolls substantially changes. Therefore, it is necessary to control the number of rotations of the bridle roll and to control the tension to a preset value. However, since the bridle roll also serves as an adjacent section, if the tension fluctuates in one section, the painting line may be changed. Since each part is affected, it is necessary to adjust the tension of the entire coating line, and it takes a long time to adjust the tension, so that stable coating cannot be performed. 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 distance between the bridle rolls is sufficiently increased without lowering the lifting speed of the lift roll. There is a way.

However, the former method has a problem that the non-coating time is long and the yield is low, and the latter method has a problem that the coating line becomes long and the equipment becomes large. An object of the present invention is to provide a method of supporting a strip of a lift roll, which can solve the above-mentioned problems by changing the operation of the lift roll from an elevating movement to an arc movement.

[0005]

According to the present invention, there is provided 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 movement, and the lift roll is provided in the vicinity of the lift roll. 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 and separated from the roll coater by the circular motion of the lift roll.

[0006]

Next, an embodiment of the present invention will be described 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 a bearing unit 3. .

The other end of the roll arm 2 has a bearing unit 6 having both ends provided on a side plate 13 of a base 12.
Is fixed by a key 7 or the like to a shaft 5 rotatably mounted on the shaft 5. A bracket 8 is provided outside the side plate 13.
The cylinder 9 is swingably mounted via a shaft. The cylinder rod 10 is rotatably connected to the other end of a cylinder arm 11 having one end fixed to the end of the shaft 5. Reference numeral 4 denotes a reinforcing member provided between the two roll arms 2 and 2. Reference numeral 14 denotes 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 disposed below and near the lift roll 1 of the lift roll device T, and the strip S is attached to the support roll 15.
, And move 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 transported in the horizontal direction. The upstream and downstream predetermined positions of the strip S are supported by bridle rolls (not shown). The roll coater 16 is a lift roll device T
It is located downstream of.

Now, the roll coater 16 is a back coater,
When the lift roll 1 is fixed and the lift roll 1 is at the solid line position, the strip S is applied to the applicator roll 1 of the roll coater 16.
The coating is performed on the back surface of the strip S in contact with the strip 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 clockwise around the shaft 5 by α °. As a result, FIG.
As shown by a two-dot chain line, the lift roll 1 moves by Y in the vertical direction, the pass line P of the strip S also rises by Y, the lift roll 1 moves by X in the horizontal direction, and the strip S is a roll coater. Separated from 16. Therefore, the connection part b passes without contacting the applicator roll 16a. This connection part b is a roll coater 1
6, the cylinder 9 is driven again after a predetermined time has passed since the detection of the connection portion b, the cylinder rod 10 is reduced, the cylinder arm 11 is pressed against the stopper 14, and the lift is performed. The coating of the strip S is resumed with the roll 1 at the original position.

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).

## EQU1 ## (B + Y) / cos β-B

(A−X) / cos γ−A At this time, since the movement amounts X and Y of the lift roll are sufficiently small with respect to the distances A and B, almost cos β =
1, cosγ = 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 vertical movement amount Y is equal to the horizontal movement amount X, the vertical change amount is absorbed by the horizontal change amount, and the strip length between 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 performs an arc movement and theoretically has some length fluctuation, it is desirable that the center position of the arc movement (the position of the shaft 5) is sufficiently separated from the lift roll 1. Actually, 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 equal to or less than the detection accuracy of the fluctuation of the tension.

In the above description, the roll coater 16 that coats only the back surface of the strip S is used. However, the movable surface coater that coats the surface of the strip S facing the roll coater 16 on the back surface. When coating the front and back surfaces of the strip S, the front coater may be retracted upward before the rotation of the lift roll 1. Further, when the surface coater of the double-sided coater is a fixed type coater, or when only the surface coater is used, the circular motion of the lift roll 1 may be reversed (counterclockwise) as described above.

In any of the above cases, since the coating line is once transported upward by the support roll 15,
A sufficient maintenance space for the surface coater can be secured near the support roll 15. In the above embodiment, the case where the support roll 15 is provided below the vicinity of the lift roll 1 has been described, but as shown in FIG.
Even when the support roll 15 is provided in the vicinity of and above the lift roll 1, if the rotation direction of the lift roll 1 is appropriately selected, the fluctuation in tension can be suppressed in the same manner as described above.

[0013]

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

[Brief description of the 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 reduced sectional view taken along line II-II of FIG.

FIG. 3 is a diagram illustrating 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)

(57) [Claims] 1. A method of supporting a strip of a lift roll provided on a roll coater, wherein the lift roll is provided so as to be able to move in an arc, and a support roll for changing a transport level of the strip near and upstream of the lift roll. A strip supporting method for 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.