JPH02188349A - Automatic superposed relaying device of web rewinding machine - Google Patents

Abstract

PURPOSE:To reduce the loss by allowing a pressing roller to press the outer periphery of a new web when a detection sensor detects the edge of an old web and by setting the length from the edge to a pressing position through a dancer roll, longer than the sum of the outer peripheral length of the new web roll and the traveling length for the time for pressing by the pressing roller. CONSTITUTION:When the edge We of an old web is detected by a sensor 14, the old web W1 is pressed onto the outer periphery of a new web roll R2 by a pressing roller 8. At the time point when the pressing roller 8 reaches a pressing position P, the length between the position P to the web edge We through a dancer roll 11 is set longer than the sum of the outer peripheral length of the new roll R2 and the traveling length for the time up to the lowering of the pressing roller 8. Therefore, the length from the superposed relaying part at the P point to the web edge We of the old web W1 is at most nearly equal to the outer peripheral length of the new roll R2, and the loss of the old web W1 can be reduced.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a method for unwinding the end portion of a web unwound from an old web roll mounted on a turret machine and set at a predetermined unwinding position. This invention relates to an automatic lap splicing device for an unwinding machine that automatically connects to the starting end of a web on a new web roll.

[Conventional technology]

Conventionally, in such an automatic splicing device, the remaining amount of the web roll at the unwinding position is detected by the winding diameter, and when this reaches a set amount, the web being fed out is placed on standby at a predetermined position and the outer periphery of a new web roll is A method has been adopted in which the terminal end of the old web is overlapped and bonded to the adhesive part provided at the starting end of the web on the new web roll by pressing it against the surface.

[Problem to be solved by the invention]

However, in the conventional means, a considerably high speed (for example, 3.5
Since the remaining amount of the old web roll unwound at a speed of
．． The limit is that it can detect up to about 5 watts. For example, when the web thickness is 5 μm, lap splicing is performed when approximately 500 web layers remain, and there is a problem in that the loss length at the end of the old web is too large.

An object of the present invention is to provide an automatic lap splicing device that can eliminate such loss length during lap splicing.

[Means to solve the problem]

The present invention provides a turret disk 2 that detachably and rotatably supports a plurality of web rolls R1 and R2, and an unwinding web Wl from an old web roll R set at a predetermined unwinding position A. A sensor 14 detects a web path for causing the web roll to run near the next new web roll R2 in the standby position B, a sensor 14 that detects the end We of the unwound web W, and the sensor 1
a pressing roller 8 that presses the unwound web Wl against the outer circumferential surface of the new web roll R2 based on the detection of the web end end of step 4 and splices it onto the bonded part M of the new web starting end on the new web roll R2; and the sensor 14; The web path between the press roller 8 and the pressing position P is set to be longer than the sum of the outer circumferential length of the new web roll R2 and the length of the web that travels during the time required for the press roller 8 to press from the standby position. A dancer roller 11 is provided to make the path slightly longer.

In addition, means for applying bank tension to the unwound web Wl is provided.

Alternatively, means is provided for actively rotating the new web roll R8 on the basis of the detection of the end of the web by the sensor 14.

[Effect]

According to the above configuration, the unwinding web WI by the sensor 14
Based on the detection of the end of the new web roll R, the pressure roller 8
The web length between this pressing position P and the web end We at the time when it is pressed against the outer peripheral surface of t is slightly longer than the outer peripheral length of the new web roll R2. Therefore, the pressing roller 8 just presses the new web If the web start end of roll R2 is pressed, the loss length of the old web Wl becomes the new web roll Rz
This is slightly longer than the outer circumference of , and this is the longest loss. The further the starting end of the new web W2 is away from the pressing position P in the roll rotation direction, the more the lap splicing position shifts backward by the distant circumferential bone, and the more the old web W
1 loss will be reduced.

(Example) Fig. 1 shows the state at the start of unwinding.The turret plate 2 has a turret plate 2 which can be rotated counterclockwise around the rotation axis l, and this turret plate 2 has four turret arms arranged in a cross shape. These turret arms 3 are alternately provided with support shafts 4 that rotatably support the new and old web rolls R7 and R2, and pairs of guide rollers 5 on the left and right sides.

In the figure, the left side of the turret plate 2 is set to the unwinding position A, and the right side is set to the standby position B, and the unwinding web W1 from the old web roll R1 set at the unwinding position A is set to the new web roll Rt at the waiting position. A web path is set by a group of guide rollers 6 so as to pass near the upper side and be guided to the processing step on the right side of the figure.

A pressure roller 8 is provided above the new web roll Rt and is driven vertically by an air cylinder 7.
acts to press the unwound web W against the outer peripheral surface of the new web roll R2.

Between both web rolls R+ -RzO, a pair of touch rollers 9 that press the unwound web W against a pair of left and right guide rollers 5, a guide roller 10, and a guide roller 5 are provided.
- A dancer roller 11 is provided which causes the web W to run in a detour significantly downward between the two. The touch roller 9 and the guide roller 10 are supported by a movable frame 12 and are movable up and down. On the other hand, the dancer roller 11 is supported by an air cylinder 13 supported by the movable frame 12 so as to move up and down. The dancer roller 11 shown in the figure is configured as a suction roller having suction holes on its outer peripheral surface, and acts to apply back tension to the unwound web W.

A sensor 14 for detecting the end of the web is provided near the unwinding position A and is movable in the front and back directions (back and forth directions) of the paper.

The sensor 14 is made up of, for example, a light emitter 14a and a light receiver 14b, and as shown in FIG. Cent so that the web WI runs.

Next, the operation will be explained. When the unwinding from the old web roll R1 is completed and the web end We passes the sensor 14, the air cylinder 7 is driven and controlled based on this detection to press the air cylinder 7 as shown in FIG. Roller 8 unwinds the web W
1 is pressed against the outer peripheral surface of the new web roll R2 at a predetermined position P.

What should be noted here is the detection of the web end We by the sensor 14 and the stacking of the new web roll Rt.

The point is that it is equipped with a means to perform a polar run-up rotation.

This drive system can be implemented using a motor provided in the turret arm 3, a drive roller that comes into contact with the roll R2, and the like. Therefore, when the pressing roller 8 is pressed against the new web roll R2 via the unwinding web W, the new web roll R
Since the roll R1 has already started its run-up rotation, the circumferential speed of the roll R1 immediately becomes the same as the running speed of the web W1. In the meantime, the unwound web W1 is polymerized and bonded to the adhesive part (using adhesive tape or the like) M provided at the web starting end of the new web roll R2, and is spliced.

Even when the web end We is separated from the old web roll R2, bank tension is applied to the unwound web W1 on the upper side in the web feeding direction than the position of the new web roll R2 due to the suction action of the dancer roller 11. Therefore, the web W1 does not flap and cause a defective overlap joint. This back tension is also applied by the touch roller 9 coming into contact with the guide roller 5.

In this case, the weighting position f from the installation position of the sensor 14 is
The length of the web path to P is set to be longer than the sum of the outer circumference of the new web roll R2 and the length of the web that travels during the time required for the pressure roller 8 to descend from the standby position to the pressing position P. A detour route by the dancer rollers 11 is set.

Therefore, when the pressing roller 8 reaches the pressing position P, the length from this position to the web end We is slightly longer than the outer circumferential length of the new web roll R2, and while the new web roll R2 rotates once, A lap joint is performed, and the old web W
The loss of , that is, the length from the lap joint to the end of the web We, is at most slightly longer than the outer circumferential length of the new web roll R2.

When the lap splicing is completed and the new web W2 is unwound, the fourth
As shown in the figure, the pressure roller 8, touch roller 9, guide roller 10, and dancer roller 11 rise and retreat, and the sensor 14 also retreats to the rear. Next, as shown in Fig. 5, the turret disk 2 starts to rotate counterclockwise, and as shown in Fig. 6, it rotates "iso" and when the new web roll R1 reaches the unwinding position A, the turret rotation stops. Then, the touch roller 9, the guide roller 10, and the dancer roller 11 descend again to the state shown in Fig. 1.Before the next lap joint is performed,
Load the next new web roll into turret arm 3 located at .

[Another embodiment example]

As the sensor 14 for detecting the end of the web #iWe, various types can be used, such as an optical sensor, an air sensor, a touch roller, etc. In short, any sensor that can detect the passage of the end of the web #iWe may be used. As a means for applying back tension to the web Wl, the guide roller 10 may be a suction roller. Alternatively, the back tension may be applied simply by bringing the touch roller 9 into contact with the guide roller 5 across the web WI.

〔Effect of the invention〕

As explained above, according to the present invention, the web length from the pressing position P to the unwound web end We at the time when the pressing roller 8 for the lap splicing 4 presses the new web roll R2 is Since the circumference of the new web roll Rt is set in advance by the dancer roller 11 to be slightly longer than the circumference of the new web roll Rt, the loss of the old web W1 can be reduced by the new web roll R2 at the maximum.
The circumferential length can be reduced to about the circumference of , and continuous unwinding with high yield can be performed.

At that time, it is equipped with a backtensidin application means, so
The unwound web W separated from the old web roll R+ will not flap (the web W can be neatly overlapped and spliced onto the new web W2 by aligning the width direction with the new web W2). Since it is equipped with a rotating means, the circumferential speed of the new web roll R2 and the unwound web W at the time of splicing.

It is possible to easily match the traveling speed of the web to almost the same, and it is possible to reliably prevent the application of unreasonable tension to the web or the separation of the old and new webs due to application of tensile force to the spliced portion.

[Brief explanation of the drawing]

1 to 6 are schematic front views sequentially illustrating the operation of the apparatus according to the present invention. 2...Turret board, pressure roller, dancer roller, sensor, unwinding position, standby position, pressing position, old web roll, new web roll, unwinding web, new web, web end.

Claims (2)

[Claims] (1) A turret board 2 that supports a plurality of web rolls R_1 and R_2 in a detachable and rotatable manner, and an old web roll R_1 set at a predetermined unwinding position A.
A web path for causing the unwound web W_1 to travel near the next new web roll R_2 located at the standby position B; a sensor 14 that detects the end We of the unwound web W_1; and a sensor 14 that detects the end We of the unwound web W_1; a press roller 8 that presses the unwound web W_1 against the outer circumferential surface of the new web roll R_2 and splices it onto the adhesive part M at the starting end of the new web on the new web roll R_2, and a pressing position of the sensor 14 and the press roller 8; In order to make the web path between P and P a little longer than the sum of the outer circumference of the new web roll R_2 and the length of the web that travels during the time required for the pressing roller 8 to perform the pressing action from the standby position. An automatic splicing device for a web unwinding machine, comprising a dancer roller 11 and means for applying back tension to an unwound web W_1. (2) A turret board 2 that supports a plurality of web rolls R_1 and R_2 in a detachable and freely rotatable manner, and an old web roll R_1 set at a predetermined unwinding position A.
A web path for causing the unwound web W_1 to travel near the next new web roll R_2 located at the standby position B; a sensor 14 that detects the end We of the unwound web W_1; and a sensor 14 that detects the end We of the unwound web W_1; a press roller 8 that presses the unwound web W_1 against the outer circumferential surface of the new web roll R_2 and splices it onto the adhesive part M at the starting end of the new web on the new web roll R_2, and a pressing position of the sensor 14 and the press roller 8; In order to make the web path between P and P a little longer than the sum of the outer circumference of the new web roll R_2 and the length of the web that travels during the time required for the pressing roller 8 to perform the pressing action from the standby position. An automatic splicing device for a web unwinding machine, comprising: a dancer roller 11; and means for rotating a new web roller R_2 in the run-up based on detection of the end of the web by the sensor 14.