JPH1045290A - Automatic web connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise the processing speed of the whole line to perform a web connection with a low tension by controlling the unwinding brake force so that the torque of a second driving means for driving a delivery roll is constant in a first control means for controlling the brake force of a brake mechanism. SOLUTION: The web tension on delivery roll inlet side is determined by the brake pressure of an unwinding shaft mill roll stand in general operation. The brake pressure of the unwinding shaft mill roll stand is controlled by an electro-pneumatic converter 19 controlled by the electro-pneumatic control means 31 of a control arithmetic device 30. The electro-pneumatic control means 31 performs a setting by an electro-pneumatic conversion setter 38. An unwinding torque control means for controlling the unwinding brake force so that the torque of a delivery roll driving motor is constant or an unwinding control means for controlling the unwinding brake force according to the winding diameter of an unwinding shaft is used as the electro-pneumatic control means 31, whereby a more stable control can be performed to perform a web connection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web splicing apparatus which enables web splicing at high speed and low tension.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional automatic web splicing apparatus. In this automatic web splicing apparatus, during normal operation, the accumulator roll unit 75 is fixed at the stroke end by an air cylinder 76, and a constant web 1 is stored in the accumulating portion. Side web tension is detected by a detector 71 and a brake 17b of an unwinding shaft (old shaft) 17a or a brake 18b of an unwinding shaft (new shaft) 18a via a tension amplifier 72.
To maintain web tension.

At the time of web splicing, the unwinding shaft (old shaft) 17
The tension control of a is temporarily stopped, switched to the strong brake, and stopped, and at the same time, the air pressure of the air cylinder 76 of the accumulation roll unit 75 is gradually reduced. For this reason, the accumulation roll unit 75 starts to move in the direction in which the stroke of the air cylinder 76 is shortened so that the web 1 is pulled in the line direction. Then, while the web stored in the accumulation section of the accumulation roll unit 75 is supplied to the post-processing, the web is connected to the unwinding shaft (new shaft) 4a.

After the web splicing to the unwinding shaft (new shaft) 18a is completed, the accumulation roll unit 7
The air pressure of the air cylinder 76 of No. 5 is gradually increased. At this time, the unwinding shaft (new shaft) 18a is under a light brake, so that the accumulation roll unit 75 starts moving in the direction in which the stroke of the air cylinder 76 becomes longer so as to press the web 1.

With the movement of the air cylinder 76 of the accumulation roll unit 75, an unwinding shaft (new shaft) 18
a is a web feeding and unwinding roll 7 by an amount corresponding to the difference between the amount of line pulling and the amount of feeding of the accumulation section.
The motor 79 is driven to adjust the feed amount. Then, when the web is accumulated in the accumulation section of the accumulation roll unit 75, the tension control of the unwinding shaft (new shaft) 18a is started again, and the normal operation is started.

[0006]

In a conventional automatic web splicing apparatus, during normal operation, the web tension on the exit side of the automatic web splicing apparatus is controlled by a braking force of a large unwinding shaft of inertia. The web has a long span from the unwinding shaft to the tension detector 71, so that the mechanical loss and acceleration / deceleration due to the friction of the intermediate roll overlap with the tension. I couldn't hope.

Further, at the time of web splicing, since tension control is temporarily stopped and the web is spliced, the web tension is not controlled, and the following various problems occur.

[0008] That is, the web tension is the accumulation roll
It is set by the air pressure of the air cylinder 76 of the unit 75. Therefore, when the unwinding shaft (old shaft) is decelerated, the air pressure during the normal operation can be instantaneously switched from the air pressure during the normal operation to the air pressure during the web splicing, depending on the setting of the air pressure of the air cylinder 76 of the accumulation roll unit 75. Can not.

Further, since the air cylinder 76 and the accumulation roll unit 75 themselves have inertia, the inertia causes a large disturbance to the tension of the web, and the problem becomes more serious as the subsequent processing speed becomes higher.

Further, since the acceleration torque when accelerating the new shaft (unwinding shaft) causes a fluctuation in the web tension, the motor 79 is driven during acceleration to correct the constant torque.
The new shaft (unwinding shaft) can be fitted with webs of various diameters and widths, so it is only an aid. In addition, since the acceleration time of the new shaft (unwinding shaft) is determined by the accumulator tension and the inertia of the unwinding shaft, the tension in the accumulator must be increased in order to accelerate in a short time. Accordingly, the acceleration time must be changed for each diameter and width of the web and becomes unstable.

Due to the above factors, in the conventional automatic web splicing apparatus, when the web splicing is inevitably performed at a high speed, a large fluctuation in tension occurs, which causes the web to be wrinkled in a subsequent process. Therefore, the processing speed of the entire line could not be increased, and web joining with low tension was impossible.

An object of the present invention is to provide a web splicing apparatus which solves the above-mentioned problems.

[0013]

According to the present invention, there is provided an automatic web splicing apparatus for splicing a web of one unwinding shaft to a web of the other unwinding shaft and feeding the web, and a brake mechanism for generating a web tension of the unwinding shaft. Control of braking force
Control means, a splice unit having a web brake mechanism for splicing the web and decelerating the running of the web, and an accumulator comprising the web delivered from the splice unit as a plurality of accumulation webs. A roll unit, an accumulation mechanism for linearly reciprocating the accumulation roll unit,
First driving means for driving the accumulating mechanism, a feeding roll for feeding the web from the accumulating roll unit, a dancer roll for keeping the web tension on the delivery side of the feeding roll constant, and a dancer roll for the dancer roll. Second control means for controlling the pressing force, position control means for controlling the feeding roll so that the position of the dancer roll is constant, second driving means for driving the feeding roll, and connection of the web Acceleration / deceleration rate means for controlling the first drive means so as to follow and synchronize the accumulation mechanism with the line speed at the start.

According to the present invention, the first mechanism for controlling the braking force of the brake mechanism for generating the web tension of the unwinding shaft is provided.
Control means for driving the feeding roll.
It is preferable to provide unwinding torque control means for controlling the unwinding brake force so that the torque of the driving means is constant.

Further, according to the present invention, a first mechanism for controlling a braking force of a brake mechanism for generating a tension of the unwinding shaft is provided.
It is preferable that the control means includes an unwinding control means for controlling an unwinding braking force in accordance with the winding diameter of the unwinding shaft.

[0016]

FIG. 2 shows the configuration of an embodiment of the present invention. As shown in FIG. 2, the automatic web splicing apparatus includes an accumulator roll unit 4 including two accumulator rolls 2 and 3 rotatably supported by a support unit, and a support roll 5. This constitutes a four-section accumulation web. The accumulation roll unit 4 is linearly reciprocated by an accumulation mechanism including two drive rollers 6 and 7 and a chain or a timing belt 8 stretched between the rollers.

The web is fed from the unwinding shaft 17a or the unwinding shaft 18a to the accumulating unit including the accumulating roll unit 4 and the accumulating mechanism via the splice unit 14, and the unrolling unit 9 and the dancer roll are fed from the accumulating unit. It is sent to a subsequent processing device via a line speed detection roll 13 via 11. The feeding roll 9 is provided with a nip roll 10, and has a structure in which a tension cut is performed.

The splice unit 14 includes web brake mechanisms 15, 16 for reducing the speed of the web.
And pressure rolls 14a, 14b for mounting the web
And knife cutters 14c and 14d, and the web brake mechanisms 15 and 16
a, 16c and brake pads (plates) 15b, 16d. In addition, the splice unit 14
It can be moved in a direction parallel to the chain 8 by a drive mechanism (not shown).

The output web tension of the feeding roll 9 is determined by the air pressure of the air cylinder 12 of the dancer roll 11. Further, the tension of the pay-out roll 9 on the delivery side of the web is tension-cut by the nip roll 10.

The web tension on the delivery roll 9 exit side is given by the air cylinder 12 of the dancer roll 11.
This tension is obtained by controlling the signal of the tension setting device 37 by the control arithmetic unit 30.
, And set by the electropneumatic converter 20. The function generator 33 corrects a non-linear portion, which is a characteristic of the air cylinder 12 of the dancer roll 11, into a straight line, and linearly outputs the tension of the dancer roll 11.

The speed signal of the automatic web splicing device uses a signal obtained by detecting the web speed at the output side of the automatic web splicing device by the line pulse generator 25 as a reference speed signal. This reference speed signal serves as a reference speed command of the servo motor drive control device 23 of the feeding roll 9. Further, when the web splicing is started, the reference speed signal is input to the acceleration / deceleration rate (ramp function) means 34 of the control arithmetic unit 30, and the output signal is used as a speed reference to drive the accumulating mechanism by the servo motor drive control unit 21. The roller 6 follows the line speed and is synchronized with the line speed. In addition,
The acceleration / deceleration rate means 34 includes a line speed detecting roller 1.
The line speed detected by the pulse generator 25 connected to the line 3 is input.

The servo motor drive controller 23 of the feeding roll 9 is speed-controlled by a reference speed signal, and tunes to the line speed. The dancer roll position is detected by the position detector 26 of the dancer roll 11. The detected position signal A is transmitted to the position calculation means 32 of the control calculation device 30.
The position of the dancer roll is controlled to be constant by correcting and controlling the servo motor drive control device 23 of the feeding roll 9 based on the deviation value.

The web tension on the feed roll entry side is determined by the brake pressure of the unwinding shaft mill roll stand during normal operation. The control of the brake pressure of the unwinding shaft mill roll stand is controlled by the electropneumatic converter 19 controlled by the electropneumatic control means 31 of the control arithmetic unit 30. The setting of the electropneumatic control means 31 is performed by an electropneumatic conversion setting unit 38.

The unwinding torque control means for controlling the unwinding braking force is used in the electropneumatic control means 31 so that the torque of the unwinding roll drive motor is constant.
Alternatively, by using the unwinding control means for controlling the unwinding brake force in accordance with the winding diameter of the unwinding shaft, more stable control can be performed and web splicing can be performed.

Note that, in the above configuration, the control arithmetic unit 30 is specifically configured by a computer.

The operation of this embodiment will be described below with reference to the time chart of FIG. 3 and the flowchart of FIG.

Now, assume that the web splicing is performed from the unwinding shaft (old shaft) 17a of the automatic web splicing device to the unwinding shaft (new shaft) 18a. At this time, the splice unit 14 is located on the unwinding shaft 18a side.

Then, as described above, the speed of the servo motor drive control device 23 of the feeding roll 9 is controlled by the reference speed signal. Then, the fluctuation in the tension of the web on the exit side of the feeding roll 9 is detected by the position detector 26 of the dancer roll 11. Then, the detected signal A is calculated by the position calculating means 32, and the servo motor driving device 23 of the feeding roll 9 is corrected and controlled based on the deviation value.
Then, the tension on the delivery roll 9 exit side is controlled to be constant.

In the time chart of FIG. 3, the time t1 is changed from the unwinding axis (old axis) 17a to the unwinding axis (new axis) 18a.
It is assumed that the web splicing has started. At the start of this,
The web is clamped by the web brake mechanism 15 of the splice unit 14 of the unwinding shaft (old shaft) 17a (step S1), and the servo motor drive control means 21 of the accumulation mechanism driving rollers 6, 7 starts operation. The acceleration / deceleration rate means (ramp function) 34 accelerates (step S2), follows the line speed, starts moving until it is synchronized, and starts supplying the web 1 accumulated in the accumulation section.

Until the accumulating mechanism driving rollers 6 and 7 are synchronized with the exit side speed (step S3), that is, in the case of the present embodiment, the accumulating section is constituted by four sections, and the moving speed of the accumulating unit 4 Until the speed becomes 1/4 of the outlet speed, the web is continuously fed from the unwinding shaft (old shaft) 17a to the accumulation mechanism. At this time, the tension inside the automatic web splicing device is
4 is determined by the pressing pressure of the web brake mechanism 15. After the web is pressed by the web brake mechanism 15, the unwinding shaft (old shaft) 17a is suddenly braked by the mill stand brake 17b by a timer (after several seconds) (step S4).

The unwinding shaft (old shaft) 17a The web brake mechanism 15 and the unwinding shaft (old shaft) 17a are suddenly braked.
This is because there is a slack in the web between them. This is to prevent the web from breaking due to the web being stretched too much between the unwinding shaft (old shaft) 17a and the web brake mechanism 15. This allows the unwinding shaft (old shaft) 1
The influence of inertia due to the difference in the remaining web diameter remaining in the web 7a can be neglected.

At time t2, when the line speed and the moving speed of the accumulation unit 14 are synchronized, the supply of the web from the unwinding shaft (old shaft) 17a stops, and the web in the splice unit 14 stops. Then, while stopped, the press roll 14b of the new base paper is pressed against the press roll 14a of the old base paper (step S5), and at the same time, the cutting of the web of the old base paper is cut by the cutter knife 14d (step S6). Then, the pressure roll 14a is released (step S7). Thereby, the web splicing ends.

When the web splicing is completed at time t3, the brake roll 17b is released (step S8), and the accumulation unit 4 starts decelerating (step S9). Then, the web of new base paper is supplied from the unwinding shaft (new shaft) 18a by an amount corresponding to the deceleration of the accumulation unit 4. That is, the rotation of the unwinding shaft (new shaft) 18a starts. At this time, the tension on the entrance side of the feeding roll 9 is determined by the inertia of the unwinding shaft (new shaft) 18a, but the tension on the exit side of the feeding roll 9 is determined by the pressing pressure of the dancer roll 11, so that the The tension on the entry side may be any tension that does not cause web breakage.

At time t4, when the web supply to the accumulation mechanism is completed, the accumulation unit 4 stops (step S10), and the brake 18b of the mill stand of the unwinding shaft (new shaft) 18a starts control (step S10). S11).

In preparation for the next web joining operation, the splice unit 14 is returned to the unwinding shaft (new shaft) 17a (steps S12 and S13), and the accumulation unit 4 is returned to the start position (steps S15, S16 and S17). ).

As described above, the accumulator unit is actively activated by the servomotor at the start of web splicing.
In addition, by driving instantaneously, high-speed web splicing is possible with the same amount of accumulation as before. In order to perform web splicing at high speed, it is essential to accelerate the accumulator roll unit instantaneously due to the limitation of the moving stroke of the accumulator unit. In the automatic web splicing apparatus of the present invention, the accumulating roll unit was accelerated in 0.5 seconds, and web splicing was performed at a line speed of 400 m / min. High speed web splicing is possible with the same amount of accumulation as before.

Next, a case where the unwinding torque control means is used as the electropneumatic control means 31 will be described. Brake 17b of unwinding shaft (old shaft) 17a of the automatic web splicing device,
As shown in FIG. 5, the unwinding torque control means of the electropneumatic converter 19 for controlling the brake 18b of the unwinding shaft (new shaft) 18a includes a mechanical loss / acceleration / deceleration compensation means 41, a torque calculation means 42, a brake amount. It comprises an offset setting means 43, a conversion means 44 and a brake amount reference setting means 46.

The unwinding torque control means detects the load current of the unwinding motor of the unwinding roll 9, inputs the detected load current to the torque calculating means 42, and controls the electropneumatic converter 19 based on the output.

This output is obtained by subtracting the torque (mechanical loss) for driving the feeding roll itself and the torque consumed during acceleration / deceleration (acceleration / deceleration torque) from the torque generated by the feeding motor, and the remaining torque is applied to the web. Is generated. Therefore, the unwinding braking force is controlled so that this torque becomes constant. Therefore, in order to compensate for the mechanical loss, the mechanical loss of the feeding roll 9 is measured, and the value is set as data in the mechanical loss / acceleration / deceleration compensation means 41. In this mechanical loss compensation, a reference speed signal of the web of the line pulse generator 25 on the output side of the automatic splicing device is input to the mechanical loss / acceleration / deceleration compensating means 41, and compensation is performed based on mechanical loss data stored according to the speed signal. .

These torque signals, mechanical loss compensation signals,
The acceleration / deceleration signal is calculated by the torque calculator 42 and input to the converter 44. And the unwinding shaft (old shaft) 17a
, Or the brake 18b of the unwinding shaft (new shaft) 18a.

The conversion means 44 outputs the output of the electropneumatic converter 19,
That is, in order to set the output of the braking force, a value obtained by measuring the air pressure applied to the brake cylinder is set as a parameter of the conversion means 44 as a parameter. Then, the brake 17b of the unwinding shaft (old shaft) 17a or the brake 18b of the unwinding shaft (new shaft) 18a is controlled.

As described above, the remaining torque obtained by subtracting the torque (mechanical loss) for driving the delivery roll itself and the torque consumed during acceleration / deceleration (acceleration / deceleration torque) from the torque generated by the delivery motor is constant. By controlling the unwinding brake force so that the unwinding tension becomes constant, the unwinding tension can be kept constant regardless of the unwinding diameter of the web, and a stable web splicing can be performed.

Next, the case where the unwinding control means is used as the electropneumatic control means 31 will be described. The unwinding control means of the electropneumatic converter 19 for controlling the brake 17b of the unwinding shaft (old shaft) 17a and the brake 18b of the unwinding shaft (new shaft) 18a of the automatic web splicing device is as shown in FIG. ,
It is composed of a diameter calculation unit and a brake calculation unit.

The diameter calculating section comprises a moving amount counter means 52, a moving amount storing means 53, and a diameter calculating means 54, and the brake calculating section comprises a first converting means 55 and a limit means 5.
6, function generating means 57, second converting means 58, read timing generating means 59, brake amount offset setting means 60, maximum diameter setting means 61, minimum diameter setting means 62, reference value setting means 63 and the like.

Then, the diameter calculation section inputs the web speed detected by the line pulse generator 25 on the output side of the automatic splicing device to the movement amount counter means 52. Also,
The movement amount counter 52 starts counting the movement amount (pulse) for each rotation of the unwinding shaft according to the signal of the read timing generator 59.

The read timing generating means 59 is supplied from the rotation detector 27 of the unwinding shaft (old shaft) 17a or the rotation detector 28 of the unwinding shaft (new shaft) 18a to the web (base paper).
Is detected for one rotation of the winding diameter, and is output to the movement amount counter means 52. The read timing generating means 59 operates so as not to perform the diameter calculation when the count value of the movement amount (pulse) of the web is unspecified when the power is turned on or after the line is stopped.

The web reference speed input to the movement amount counter means 52 integrates the speed for each rotation of the read timing generation means 59, and the movement amount storage means 53 stores the movement amount (pulse) for each rotation. .

The moving amount storage means 53 stores the 1
Since the moving amount (pulse) for each rotation is equal to the circumference of the base paper of the unwinding shaft, the moving amount (pulse) is calculated for each rotation and the pi circuit (π), and the diameter of the base paper of the unwinding shaft is calculated. Is the diameter calculating means 54
Calculate with. The limit means 56 sets the maximum and minimum diameters of the web (base paper) of the unwinding shaft to the maximum diameter setting means 6.
1 and the minimum diameter setting means 62.

An output obtained by inputting the signal of the limit means 56 and the electro-pneumatic converter reference value 45 to the arithmetic means 65 and multiplying the result is
It is input to the function generating means 57. This function generating means 57
Interpolates and outputs a non-linear portion, which is a characteristic of a brake, so as to be linear according to the winding diameter of the web (base paper). Further, since the brake has an offset area, the signal obtained by correcting the area by the offset setting means 60 is input to the second conversion means 58 of the brake calculation unit.

The second conversion means 58 of the brake calculation section is
In order to set the output of the electropneumatic converter 19, that is, the output of the braking force, the value obtained by measuring the air pressure applied to the brake cylinder is set as a parameter in the coefficient of the conversion means 58.

The signal from the second conversion means 58 is supplied to the electropneumatic converter 19 by a brake signal corresponding to the diameter of the unwinding shaft.
(Kgf), and the braking force of the unwinding shaft is controlled.

As described above, the second operation of the brake operation unit
By inputting the braking force setting (electro-pneumatic converter reference value) to the diameter signal calculated by the movement amount (pulse) of the web per rotation of the diameter calculation unit and the pi (π) to the conversion means 58 Since the electropneumatic converter 19 is controlled according to the diameter of the unwinding shaft, the unwinding tension is kept constant by the brake 17b of the unwinding shaft (old shaft) 17a or the brake 18b of the unwinding shaft (new shaft) 18a. , Stable web splicing can be performed.

In the above embodiment, the brake 17
Although the electropneumatic converter is used to control the b and 18b, when the brake is an electromagnetic brake, a current controller for controlling the current to the electromagnetic brake can be used.

[0054]

As described above, a high-speed web splicing can be performed with the same amount of accumulation as before by actively and instantaneously driving the accumulating roll unit by the servomotor at the start of web splicing. In the automatic web splicing apparatus of the present invention, the accumulating roll unit is accelerated in 0.5 seconds, and web splicing can be performed at a line speed of 400 m / min.

Further, by using an unwinding torque control means for the electropneumatic converter of the unwinding shaft and controlling the unwinding braking force so that the torque generated by the unwinding motor becomes constant, the unwinding diameter of the web can be reduced. Regardless of the size, the unwinding tension was kept constant and stable control was possible, enabling web splicing.

Similarly, by using the unwinding control means as the electropneumatic control means of the unwinding shaft, calculation is performed on the basis of the movement amount (pulse) of the web per one rotation of the unwinding shaft and the circumferential ratio (π), By controlling the unwinding brake force according to the winding diameter of the unwinding shaft, stable control was achieved and web splicing was enabled.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a conventional web automatic joining device.

FIG. 2 is a diagram showing a configuration of one embodiment of the present invention.

FIG. 3 is a time chart for explaining the operation of the embodiment in FIG. 2;

FIG. 4 is a flowchart for explaining the operation of the embodiment of FIG. 2;

FIG. 5 is a diagram showing torque control means according to one embodiment of the present invention.

FIG. 6 is a diagram showing unwinding control means according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Web 2, 3 Accumulation roll 4 Accumulation roll unit 6, 7 Accumulation mechanism drive roll 9 Feeding roll 10 Nip roll 11 Dancer roll 12 Air cylinder for dancer roll 14 Splice unit 15, 16 Web brake mechanism 17a, 18a Unwinding shaft 17b , 18b Mill stand brake 19 Electro-pneumatic converter for unwinding shaft 20 Electro-pneumatic converter for dancer roll 21, 23 Servo motor drive control means 22, 24, 25 Pulse tachogenerator 27, 28 Rotation detector 30 Control arithmetic unit 34 Addition Deceleration rate means

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masaaki Ito 2-3-3, Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Japan Reliance Co., Ltd. (72) Masao Okuda 2-3-3, Fukuura-2, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Japan Reliance Co., Ltd.

Claims (3)

[Claims] An automatic web splicing device for splicing a web of one unwinding shaft to a web of the other unwinding shaft, and controlling a braking force of a brake mechanism for generating a web tension of the unwinding shaft. And a splicing unit having a web brake mechanism for splicing the web and reducing the running of the web, and a web sent from the splice unit,
An accumulating roll unit comprising a plurality of accumulation webs; an accumulating mechanism for linearly reciprocating the accumulating roll unit; first driving means for driving the accumulating mechanism; and a web from the accumulating roll unit Roll, a dancer roll for keeping the web tension on the exit side of the roll, a second control means for controlling the pressing force of the dancer roll, and the position of the dancer roll is constant. Control means for controlling the feeding roll, second driving means for driving the feeding roll, and the first drive so that the accumulating mechanism follows the line speed and is synchronized with the start of web splicing. Acceleration / deceleration rate means for controlling the means. Automatic splicing device. 2. The automatic web splicing device according to claim 1, wherein the first control means for controlling a braking force of a brake mechanism for generating a web tension of the unwinding shaft is configured to drive the feeding roll. 2. An automatic web splicing device comprising an unwinding torque control means for controlling according to the torque of the drive means. 3. The automatic web splicing device according to claim 1, wherein said first control means for controlling a braking force of a brake mechanism for generating a web tension of said unwinding shaft includes: An automatic web splicing device having an unwinding control means for controlling the web splicing according to the conditions.