JP2001121628A - Method for adjusting tension of belt of single facer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always apply proper tension generating no shift left and right to a pressure belt used in the laminating process of a single facer by detecting the both end positions of a tension adjusting roller to adjust the inclination of the roller. SOLUTION: Hydraulic cylinders 6, 6 moving the position of a tension adjusting roller 5a which adjusts the tension of a pressure belt provided in contact with the corrugating roll 2 of a single facer and position detectors 7, 7 for detecting both end positions of the tension adjusting roller are connected to both end positions of the tension adjusting roller 5a and the distances up to a position reference roller 5b at both ends of the tension adjusting roller are respectively calculated to be compared with each other and, when the difference between the distances exceeds a predetermined range, it is judged that there is inclination of a certain degree bringing about trouble in the tension adjusting roller 5a with respect to the position reference roller 5b and the tension adjusting roller 5a is pressed by the hydraulic cylinder 6 on the side small in distance to adjust the inclination of both ends of the tension adjusting roller 5a to keep the tension of the pressure belt proper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the tension of a belt used in a process of laminating a middle face paper and a liner paper of a single facer.

[0002]

2. Description of the Related Art As is well known, a single facer is formed by waving a middle sheet of paper with a pair of step rolls, gluing the top of the step, and pressing a liner paper on the top. Combine to form a single-sided cardboard. In recent years, a pressure belt has been often used as a means for pressing the liner paper against the middle paper. This is because the pressure belt method has the advantages that the contact range between the belt and the step roll is long, the contact pressure is small, the generation of vibration and noise is small, and a high quality product is obtained.

An example of a single facer employing such a pressure belt system is disclosed in Japanese Patent Application Laid-Open No. H11-105172.
An "one-sided corrugated cardboard manufacturing apparatus" disclosed in Japanese Patent Application Laid-Open Publication No. H10-209,086 is known. This device applies glue to the middle paper rolled by a pair of corrugated rolls and then presses the liner paper to be bonded to the middle paper. A pressure belt is stretched between a tension adjusting roller and an intermediate roller whose both ends are independently moved in the direction of contact and separation with respect to the reference roller.

A metallic object to be detected is buried in each of the corresponding positions at both ends of the pressure belt, and a time difference occurs between detection signals generated from the metal sensors for detecting these objects. When the pressure belt is twisted, a force is applied to one of both ends of the tension adjusting roller in the direction of contacting and separating from the position reference roller by a cylinder device to control the attitude of the tension adjusting roller. Thereby, the circumferential lengths of both ends of the pressure belt are made uniform. Also,
As an object to be detected, instead of the above-described metal body, there is also an object in which a color mark is attached on the corresponding pressure belt surface, or a member in which a protrusion is provided on a side portion of the corresponding pressure belt. .

[0005]

By the way, when the liner paper is pressure-bonded to the middle paper in the step of laminating the middle paper and the liner paper by the pressure belt, the contact pressure between the belt and the step roll is reduced. An uneven state may occur in the width direction. Such inconveniences may be caused by a change in the thickness of single-sided cardboard, uneven moisture, uneven thickness of the belt, etc., but may also be caused by the parallelism of the roller around which the belt is wound or the dimensional accuracy of the outer diameter of the roller. .

[0006] In particular, the influence caused by the parallelism of the rollers has a great effect because the tension adjusting roller is provided so as to be always movable for adjusting the tension. As shown in FIG. 3, when the rollers are not parallel, the belt having a shorter length generates a twist in the belt in advance, and as the twist progresses, the width of the belt becomes narrower. The sheet is not wrinkled and wrinkles.

In the belt tension adjusting method employed in the single facer according to the above-mentioned published patent publication, which has been proposed to prevent the sheet from being wrinkled due to such a belt twist, the belt is covered on the belt side. Because it is an indirect method of embedding a metal body that is the detection object, detecting the movement of the object to be detected with a metal sensor, and detecting the difference in the perimeter of both ends of the belt from the timing shift of the movement of both ends of the belt. In addition, the parallel adjustment of the rollers is unstable, and the accuracy of the belt tension adjustment is insufficient.

In addition, since the single facer is at a high temperature of about 100 ° C., there is a disadvantage that the metal sensor malfunctions and the parallel adjustment of the rollers and the tension adjustment of the belt cannot be performed accurately. Furthermore, when the detected object is a color mark attached to the belt surface, the color adheres to the liner paper, and the single-sided cardboard becomes defective, or the color gradually disappears and cannot be detected. Furthermore, when the detected object is a protrusion provided on the side of the belt, the protrusion may be caught during rotation and may be damaged, and may not be detected.

According to the present invention, the belt tension is adjusted by directly detecting the distance between both ends of the position reference roller and the tension adjusting roller so that both rollers are parallel to each other. It is an object of the present invention to provide a belt tension adjusting method for obtaining a high-quality corrugated cardboard product by keeping a single-faced corrugated cardboard with a single facer without wrinkling.

[0010]

According to the present invention, as a means for solving the above-mentioned problems, liner paper is formed by waving a pair of single rolls of a single facer in a wavy shape, and gluing the top of the liner to a liner paper. A pressure belt is stretched between a plurality of rollers having a position reference roller and a tension adjustment roller so as to be pressed and bonded, and the both ends of the tension adjustment roller are separated from the position reference roller independently. In the method of adjusting the tension of the pressure belt by applying a force, the same predetermined separating force is always applied to both ends of the tension adjustment roller, and the position detectors provided at both ends of the tension adjustment roller are used to adjust the tension of the both ends. Compare the distance between both ends of the position reference roller and the tension adjustment roller obtained by detecting the respective positions, and if there is a difference between these distances that is greater than the allowable range, the tension of the smaller distance The tension adjusting roller is adjusted so that the tension adjusting roller is parallel to the position reference roller by applying a separating force greater than the predetermined separating force to the end of the aligning roller. The belt tension of the single facer was adjusted.

According to the belt tension adjusting method of the present invention,
The distance at both ends between the tension adjusting roller and the position reference roller is detected by the position detector. Based on the detection signal, the distances at both ends are compared, and when the difference is within the allowable range, the same predetermined separating force is applied to the tension adjusting roller, and the lamination is performed in a state where the circumferential lengths on both sides of the belt match. Done.

If the difference between the distances is greater than the allowable range, a greater separation force than the normal predetermined separation force is applied to the end of the tension adjustment roller on the side where the distance is smaller at both ends to reduce the inclination of the tension adjustment roller. Fix it. By such adjustment, the tension adjusting roller becomes parallel to the position reference roller, and the circumferential lengths on both sides of the belt coincide.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows main components of the single facer according to the embodiment. As shown in the figure,
Is corrugated between a pair of step rolls 1 and 2, and the sheet of paper a is held around the peripheral surface of the step roll 2 by means of suction or air blowing while rotating the step roll 2. Transported in the direction. A gluing device 3 is provided around the step roll 2, and the glue is applied by the gluing device 3 to the top of the middle sheet a after the step rolling.

A part of a pressure belt 4 is provided on the outer peripheral surface of the step roll 2 by pressing. The pressure belt 4 is composed of an endless belt, and includes a plurality of rollers 5a, 5b,
It is hung between 5c and stretched. The liner paper b is guided by the pressure belt 4 and fed, and is pressed and bonded to the glued middle paper a after the stepping, and the single-faced cardboard A is formed by the bonding.

One of the rollers 5a, 5b, 5c on the side of the step roll 2 is connected to the other roller 5b.
The pressure belt 4 is adjusted to be parallel to
The roller 5b is a position reference roller having a fixed position serving as a reference with respect to the position of the roller 5a. The position of the roller 5c is fixed,
An intermediate roller that guides the pressure belt 4. The shaft portions at both ends of the tension adjusting roller 5a are provided as pressing means of a tension adjusting device, and are connected to piston rods 6a of a pair of hydraulic cylinders 6 that operate independently.

When adjusting the tension of the pressure belt 4, each of the pair of hydraulic cylinders 6 serving as the pressing means always has the same predetermined separating force in the direction in which the tension adjusting roller 5a separates from the position reference roller 5b. By applying the same and predetermined first hydraulic pressure, the rollers 5a and 5b are kept parallel to each other, and if this parallelism is lost for any reason, the hydraulic cylinder 6 on the shorter distance from the position reference roller 5b is By applying a higher second oil pressure corresponding to a separation force larger than the predetermined separation force, the position reference roller 5
The rollers 5a and 5b are made parallel to each other by making the respective distances from both ends of b to both ends of the tension adjusting roller 5a the same.

When the rollers 5a and 5b become parallel to each other, the hydraulic pressure applied to the hydraulic cylinder 6 to which the second hydraulic pressure corresponding to the large separating force is applied is switched to the first hydraulic pressure corresponding to the predetermined separating force.

The predetermined repulsion force is a position reference such that a reasonable tension can be applied to the pressure belt 4 such that the liner paper b can be appropriately pressed against the middle paper a to perform good bonding. The predetermined separating force applied to the tension adjusting roller 5a in the direction away from the roller 5b, and the separating force larger than the predetermined separating force is defined as a tension adjusting roller that does not give the pressure belt 4 a certain extension or more. The separating force is larger than the above-mentioned predetermined separating force that can be adjusted so that 5a becomes parallel to the position reference roller 5b.

Although FIG. 2 shows only one hydraulic path to the hydraulic cylinder 6, each hydraulic cylinder 6 is actually a double-acting type. Although two pipes are provided, they are shown by one path to avoid complication. Further, at both ends of the tension adjusting roller 5a, position detectors 7, 7 for detecting the positions of both ends are mounted on the shaft. As the position detectors 7, 7, a potentiometer is used in this example. The detection signals from the position detectors 7, 7 are sent to the next control unit 10.

As shown in FIG. 2, the control unit 10 includes a position detecting unit 11, a calculating unit 12, and a comparing and determining unit 13.
It has the following operation.

In the position detecting unit 11 to which the detection signals from the position detectors 7 and 7 are inputted, based on the detection signals, the distance between the roll centers at both ends from the position reference roller 5b to the tension adjusting roller 5a is determined. Distance L _OP , L
_DR is obtained (OP indicates the operation side, and DR indicates the drive side). The signals corresponding to the distances L _OP and L _DR are calculated by the arithmetic unit 12.
In order to obtain the state of displacement between the two ends of the roller 5a and the roller 5b, an operation of a difference (L _OP -L _DR ) is performed, and the difference (L _OP -L _DR ) is calculated. The corresponding signal is sent to the comparison / determination unit 13.

The comparison / determination unit 13 outputs a signal to the switching circuit 21 after performing the following comparison and determination.

First, the absolute value of the input difference | L _OP -L _DR |
Is compared with the permissible value δ stored in the comparison discriminating unit 13. If | L _OP −L _DR |> δ, the comparison between L _OP and L _DR is further performed. A signal corresponding to the following two comparison results is output to the switching circuit 21.

The value of the difference is positive, that is, L _OP > L _DR
If the drive-side distance _LDR is shorter and the tension adjustment roller 5a is determined not to be parallel to the position reference roller 5b, the drive-side hydraulic cylinder 6 is adjusted to adjust this to be parallel. signal alpha ₁ a switching circuit 2 for switching the hydraulic
Output to 1.

The value of the difference is negative, that is, L _OP <L _DR
In the case of, the tension adjusting roller 5a is moved to the position reference roller 5b.
A signal α ₂ for switching the hydraulic pressure to the hydraulic cylinder 6 on the operation side is output to the switching circuit 21 in order to adjust the hydraulic pressure to be parallel.

The comparison / determination unit 13 compares the absolute value | L _OP −L _DR | of the difference with the allowable value δ, and | L
_{When OP−} L _DR | ≦ δ, the parallelism of the tension adjusting roller 5a with respect to the position reference roller 5b is within an allowable range, and when it is determined that the tension of the pressure belt 4 is appropriate, the switching signal α
A signal α ₃ for switching the hydraulic pressure to the cylinder 6 on the side where ₁ or α ₂ has been output is output to the switching circuit 21.

Note that the allowable value δ is a value related to the parallelism between the position reference roller 5b and the tension adjusting roller 5a, and does not hinder the operation of the single facer or the lamination of the inner sheet a and the liner sheet b. Should be set appropriately so as not to cause
It may be.

The hydraulic circuit 20 is provided with a hydraulic pump capable of generating a first hydraulic pressure corresponding to the predetermined separating force and a second hydraulic pressure corresponding to a separating force larger than the predetermined separating force. The second hydraulic pressure higher than the first hydraulic pressure is sent to the switching circuit 21 through the line 22H.

The switching circuit 21 to which the first hydraulic pressure and the second hydraulic pressure are sent is based on _{one of} the switching signals α ₁ , α ₂ , and α ₃ from the comparison / determination circuit 13 as follows. The operation is performed so as to switch the hydraulic pressure to the hydraulic cylinder 6.

Since the same first hydraulic pressure is always supplied from the switching circuit 21 to both of the pair of hydraulic cylinders 6, both ends of the tension adjusting roller 5a
The roller 5a is separated from both ends of the roller b by the same predetermined separating force, the roller 5a is kept parallel to the roller 5b, and an appropriate tension is applied to the pressure belt 4.

However, if the parallelism between the tension adjusting roller 5a and the position reference roller 5b is impaired for some reason and the degree exceeds the allowable range and | L _OP -L _DR |> δ, the following operation is performed. I do.

When L _OP > L _DR , the switching signal α ₁ is supplied from the comparison / determination circuit 13 to the switching circuit 21. Based on this switching signal α ₁ , the hydraulic pressure sent from the switching circuit 21 to the hydraulic cylinder 6 on the driving side
The first hydraulic pressure, which has always been sent when a and 5b are parallel, is switched to the higher second hydraulic pressure. At this time, the hydraulic pressure sent to the hydraulic cylinder 6 on the operation side remains at the first hydraulic pressure without being switched.

Accordingly, the driving-side end of the tension adjusting roller 5a is moved in a direction away from the driving-side end of the position reference roller 5b by a larger separating force, so that the two rollers 5a and 5b eventually reach the allowable range. The parallelism is reached, and the switching signal α ₃ is supplied from the comparison / determination circuit 13 to the switching circuit 21. Based on this switching signal α ₃ , the switching circuit 21
The hydraulic pressure sent to the hydraulic cylinder 6 on the drive side is switched from the second hydraulic pressure to the first hydraulic pressure again, so that the hydraulic pressure sent to both hydraulic cylinders 6 becomes the first hydraulic pressure and the tension adjusting roller 5a Is kept parallel to the position reference roller 5b.

When L _OP <L _DR , the switching signal α ₂ is supplied from the comparison / determination circuit 13 to the switching circuit 21. Based on the switching signal α ₂ , the switching circuit 21
The hydraulic pressure sent to the hydraulic cylinder 6 on the operation side is switched from the first hydraulic pressure that has been constantly transmitted when both rollers 5a and 5b are parallel to the second hydraulic pressure that is higher than this. At this time, the hydraulic pressure sent to the hydraulic cylinder 6 on the driving side is maintained at the first hydraulic pressure without being switched.

Therefore, the operation side end of the tension adjusting roller 5a is moved in the direction away from the operation side end of the position reference roller 5b by a larger separating force, and the two rollers 5a, 5b eventually become within the allowable range. The parallelism is reached, and the switching signal α ₃ is supplied from the comparison / determination circuit 13 to the switching circuit 21. Based on this switching signal α ₃ , the switching circuit 21
The hydraulic pressure sent to the hydraulic cylinder 6 on the operation side is switched from the second hydraulic pressure to the first hydraulic pressure again, so that the hydraulic pressure sent to both hydraulic cylinders 6 becomes the first hydraulic pressure and the tension adjusting roller 5a Is kept parallel to the position reference roller 5b.

With the above adjustment, the tension adjusting roller 5
When a and the position reference roller 5b are parallel to each other, the running lengths at both ends of the pressure belt 4 match, and the tension becomes appropriate.

In the above-described embodiment, the separating force of the tension adjusting roller 5a is applied by pressing the hydraulic cylinders 6, 6. However, by mounting the hydraulic cylinders 6, 6 in opposite directions, the hydraulic cylinder 6 is mounted. You may make it give by the tension | pulling in 6,6.

[0038]

According to the belt tension adjusting method for a single facer of the present invention, the position of the both ends of the tension adjusting roller is detected by the position detector, and the position reference roller and the tension adjusting roller are obtained. The distances are compared, and when there is a difference between these distances that is greater than an allowable range, the tension of the belt wound around these rollers is adjusted by making the tension adjusting roller parallel to the position reference roller. Therefore, the malfunction of the sensor due to the high temperature, the adjustment of the belt tension to equalize the belt tension due to the disappearance or breakage of the object to be detected, etc., will not be accurate or impossible. And accurate and reliable tension control can be performed.

Accordingly, the life of the belt is extended, and
A high quality product can be obtained without wrinkling of the produced single-sided cardboard sheet.

[Brief description of the drawings]

FIG. 1 is a main configuration diagram of a single facer according to an embodiment.

FIG. 2 is a schematic diagram of a tension adjusting mechanism of the pressure belt according to the first embodiment;

FIG. 3 is an explanatory view of wrinkles generated in a conventional single facer.

[Explanation of symbols]

 1 roll 2 roll 3 gluing device 4 pressure belt 5a, 5b, 5c roller 6 hydraulic cylinder 7 position detector 10 control unit 20 hydraulic circuit

Claims (1)

[Claims] 1. A pressure belt is tensioned with a position reference roller so that a liner paper is pressed against a middle sheet glued to the top of a single facer and then stuck together by a pair of step rolls of a single facer. A method of adjusting the tension of the pressure belt by stretching between a plurality of rollers having rollers and applying a separating force in a direction to separate both ends of the tension adjusting roller independently from the position reference roller. The same reference separation force is always applied to both ends of the adjustment roller, and the position reference roller and the tension adjustment obtained by detecting the respective positions of both ends by the position detectors provided at both ends of the tension adjustment roller. Compare the distance between both ends of the rollers, and when there is a difference between these distances that is greater than the allowable range, apply a separation force larger than the above-mentioned predetermined separation force to the end of the tension adjustment roller with the smaller distance. A tension adjusting roller for adjusting the tension of the pressure belt so as to be parallel to the position reference roller.