JPH0885654A - Automatic web splice unit - Google Patents

Abstract

PURPOSE: To provide an autoamtic web splicer that is less in a variation in tension in time of web splicing and able to do operations in succession. CONSTITUTION: A splice unit 2 splicing a web 1 is driven by a chain 5. This splice unit 2 is provided with two rotatable splice rolls 8a, 8b, and brake bars 10a, 10b pinching the web between both these rolls 8a and 8b, and two cutter knives 9a and 9b for cutting the web 1, respectively. At the time of automatic web splicing, the splice unit gets shifting into acceleration, and this speed of the splice unit synchronizes with a line speed of the web, splicing the web as traveling, and also at the time of web splicing, tension at the outside of an automatic web splice unit is controlled so as to keep constant by means of a brake tension roll 12 of a winding shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an automatic web joining device,
In particular, the present invention relates to a compact web automatic splicing device capable of splicing the web while the web is spliced while moving in synchronism with the line speed of the web so that the web can be spliced automatically with less fluctuation in tension when splicing the web.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional automatic web joining apparatus detects a web tension on the output side of the automatic web joining apparatus by a detector 41 and, via a tension amplifier 42,
The unwinding brake 1a for the unwinding A axis or the unwinding brake 1b for the unwinding B axis is controlled to keep the web tension constant during normal operation. When the web is spliced, the tension control is temporarily cut off, and the unwinding B-axis (old shaft) is decelerated and stopped by the strong brake, and at the same time, the air pressure of the air cylinder 46 of the accumulation roll unit 45 is lowered. During normal operation, the accumulation roll unit 45 is held at the stroke end by the air cylinder 46. However, as the unwinding B-axis decelerates, the accumulation roll unit 45 is pushed by the tension of the web to accumulate the accumulation roll unit 45.・ Unit 45
The movement starts in the direction in which the stroke of becomes shorter. In this way, the unwinding B-axis slows down and stops, and while the web is being spliced, the web accumulated in the accumulation roll section is supplied. Then, when the web joining is completed, the air pressure in the air cylinder 46 is gradually increased again. At this time, the unwinding A-axis (new axis) is weakly braked, and the accumulative roll unit 45 eventually moves to the stroke end opposite to the direction in which it has been moving due to the increase in air pressure in the cylinder 46. Move up to. The unwinding A-axis starts feeding the web by an amount corresponding to the difference between the pulling amount of the line and the feeding amount of the accumulating portion due to the deceleration of the accumulating roll unit 45. At this time, in order to assist the acceleration of the unwinding A-axis, the motor 49 of the feeding roll 48 is
Drive. The motor 49 is stopped when the acceleration of the unwinding A axis is completed, and the tension control of the unwinding axis is restarted, and the normal operation is performed.

[0003]

As described above, when the web is spliced, the tension control is temporarily cut off, and the strong brake is used to decelerate and stop the unwinding old shaft. At the same time, the air pressure of the air cylinder of the accumulation roll unit is lowered. ,
With the deceleration stop of the unwinding old shaft, it is pushed by the tension of the web,
The accumulation roll unit starts moving in the direction of the shorter stroke. In this way, the unwinding old shaft decelerates and stops, and while the web accumulated in the accumulator is supplied, the unwinding new shaft is spliced with the web. There is a problem that the automatic splicing device becomes large and it takes time to prepare for splicing the web.

An object of the present invention is to solve such problems and to provide an automatic web splicing device capable of performing continuous work with little fluctuation in tension when splicing webs.

Another object of the present invention is to provide an automatic web splicing device which is small in size and which is capable of highly accurate and quick responsive web splicing.

[0006]

SUMMARY OF THE INVENTION In order to solve these problems, the present invention proposes that the splice unit starts moving and accelerates during automatic web splicing so that the speed of the splice unit synchronizes with the line speed of the web. However, the web is spliced while moving, and the tension is controlled so that the tension on the output side of the automatic web splicing device is kept constant by the tension roll even when splicing the web. (Old shaft) is decelerated and stopped by a strong brake, and the web accumulated in the accumulation part is supplied.
Compared to the method of web splicing on the unwinding shaft (new shaft), it is a compact web automatic splicing device that enables automatic web splicing with less fluctuation in tension.

[0007]

[Function] Unlike the method in which the tension control is temporarily disconnected when the web is spliced and the unwinding shaft (old shaft) is decelerated and stopped by a strong brake, the splice unit moves the web while synchronizing its speed with the line speed of the web. To take over
There is little fluctuation in tension when the web is spliced, and work can be performed continuously. In addition, since the accumulator for web splicing is not required, the device can be downsized and the work can be made lighter. Therefore, it is possible to perform automatic web splicing that is simple, highly accurate and highly responsive. Become.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the structure of an automatic web joining device according to an embodiment of the present invention.

This automatic web splicing device has feed-out shafts 6 (A-axis) and 7 (B-axis) for feeding out a base paper, brakes 28, 29 for these feed-out shafts, and an electropneumatic converter 27 for controlling these brakes. And a splice unit 2 that splices the web 1. This splice unit 2 has 2
Individual rotatable A-axis side or B-axis side splice rolls 8a, 8b and A-axis side or B-axis side brake bars 10a, 10b sandwiching the web between the splice rolls 8a, 8b.
And an A-axis side or B-axis side cutter knife 9a, 9b for moving up and down to cut the web 1.

The automatic web splicing device further comprises a splice unit moving mechanism for linearly reciprocally driving the splice unit 2 by a chain or timing belt 5 stretched between the drive roll 3 and the drive roll 4.
AC servo motor 21 for driving the splice unit moving mechanism, rotation detector 23 connected to AC servo motor 21, control device 22 for controlling AC servo motor 21, and paper roll 11 for guiding web 1.
And this paper roll moving mechanism (not shown),
A tension roll 12 that controls the tension of the web 1, an AC motor 24 that drives the tension roll 12, and an AC
A rotation detector 25 connected to the motor 24, a controller 26 for controlling the AC motor 24, a web tension detecting roll 13 for detecting web tension, a tension detector 14 for detecting web tension, and a web. 1, a line speed detection roll 15 for detecting the line speed, a speed detector 16 connected to the roll 15, a free roll 17, a speed command to the control devices 22 and 26, and a brake torque to the electropneumatic converter 27. And a control arithmetic unit 30 for giving a command.

The control arithmetic unit 30 includes a speed control circuit for the splice unit, a web tension control circuit for the tension rolls 12, and an unwinding shaft (A-axis 6) for feeding out the base paper.
And a B-axis 7) brake torque control circuit.

The speed control circuit of the splice unit is
It is composed of a ramp function unit 31, a comparator 32, and a polarity reversing unit 33, and the web tension control circuit includes a tension setting unit 35,
It is composed of a tension calculator 36, a subtractor 34, and an adder 37, and the brake torque control circuit is composed of a torque setter 38, a subtractor 39, and a proportional integrator 40.

Next, the operation of the automatic web splicing device of this embodiment will be described.

In the automatic web joining device, the web 1
Is an auxiliary roll, a splice unit 2 splicing unit A-axis side or B-axis side splice
The roll (8a or 8b), the paper roll 11, the tension roll 12, the web tension detecting roll 13, the line speed detecting roll 15, and the free roll 17 are sent to the subsequent processing device. The splice unit 2 is fixed by a brake (not shown) during normal operation, and can be released and driven by a web splicing start signal. When the web is spliced, the brake is turned on again and the splice unit 2 is fixed. The web tension is determined by the brakes 28 and 29 of the unwinding shaft (A shaft 6 or B shaft 7), while the braking torque of the unwinding shaft (A shaft 6 and B shaft 7) is controlled by the electropneumatic converter 27. It This brake torque command is given from the control arithmetic unit 30 as described above.

When the web is spliced from the B-axis 7 (old base paper) to the A-axis 6 (new base paper), first, the base paper of the A-axis 6 is attached to the A-axis side splice roll 8a corresponding to the A-axis 6 and the leading end of the web 1 is formed. Adhesive tape or the like is attached to, the A-axis side brake bar 10a is raised, and the web 1 is sandwiched between the A-axis side splice rolls 8a.

When the base paper of the B-axis 7 approaches the end, automatic web splicing is started, and the B-axis side brake bar 10b of the splice unit 2 is lifted by the web splicing start signal, and the web 1 is sandwiched. At the same time, splice
The brake fixing the unit 2 is released, and at the same time, the AC servomotor 21 is driven, and the splice unit 2 starts moving in the payout direction as shown in FIG.

Then, when the splice unit 2 starts moving and the moving speed of the splice unit 2 is tuned to the line speed, the A-axis splice roll 8a is moved by the speed tuning signal as shown in FIG. The web is adhered (joined) by pressure bonding to the B-axis side splice roll 8b.
At the same time that the webs are bonded (joined), the B-axis side cutter knife 9b operates to cut the B-axis 7 (old base paper), and after cutting, the B-axis side brake bar 10b descends.

Splice unit 2 which was in speed synchronization
As shown in FIG. 3, is decelerated and stopped at the same time as the web joining is completed, and is fixed by the brake. Then splice
As shown in FIG. 4, the unit 2 is moved from the stopped position to the web jointing position on the old base paper side (B axis 7), and at the same time, the paper roll 11 is moved on the new axis side (A axis 6). That is, the paper roll 11 is anti-parallel moved with respect to the splice unit 2. Then, by setting a new base paper on the old base paper side (B axis 7), web splicing can be repeated.

Similarly, when connecting the web from the A-axis 6 (old base paper) to the B-axis 7 (new base paper), first, the base paper of the B-axis 7 is transferred to the B-axis side splice roll 8b corresponding to the B-axis 7. 1
Adhesive tape or the like is attached to the tip of the web, and the B-axis side brake bar 10b is raised to sandwich the web 1 between the B-axis side splice rolls 8b.

When the base paper of the A-axis 6 approaches the end, automatic web splicing is started, and the A-axis side brake bar 10a of the splice unit 2 is lifted by the web splicing start signal to sandwich the web 1. At the same time, splice
The brake fixing the unit 2 is released, the AC servo motor 21 is driven at the same time as the web splicing start signal, and the splice unit 2 starts to move in the reverse direction.

Then, when the splice unit 2 starts moving and the moving speed of the splice unit 2 is synchronized with the line speed, the B-axis splice roll 8b is changed to the A-axis side splice roll 8a by the speed tuning signal. Clamp to and bond (join) the web. At the same time that the webs are bonded (joined), the A-axis side cutter knife 9a operates to cut the A-axis 6 (old base paper), and after cutting, the A-axis side brake bar 10a descends. The splice that was in speed
The unit 2 is decelerated and stopped at the same time when the web joining is completed, and is fixed by the brake. Next, the paper roll 11 moves from the position where the splice unit 2 is stopped to the web jointing position on the old base paper side (A axis 6), and at the same time, the paper roll 11 moves to the new shaft side (B axis 7). Then, by setting a new base paper on the old base paper side (A axis 6), web splicing can be repeated.

The splice unit 2 of the automatic web splicing device is linearly reciprocally driven as described above by the chain or the timing belt 5 stretched between the driving roll 3 and the driving roll 4. The timing belt 5 is driven by the AC servo motor 21. AC servo motor 21
The speed command to the control unit 22 is given by the control arithmetic unit 30.

Next, the operation of the control arithmetic unit 30 when the web is spliced from the B-axis 7 (old base paper) to the A-axis 6 (new base paper) will be described.

When the base paper is set on the unwinding shaft of the automatic web splicing device and the line is operated,
The line speed signal detected by the line speed detector 16 and the tension signal detected by the web tension detector 14 are input as the web travels. The line speed signal input to the control arithmetic unit 30 is used as a speed reference signal for the AC servo motor 21 and the AC motor 24.

In the web tension control circuit of the tension roll 12, the subtractor 34 subtracts the signal detected by the web tension detector 14 of the tension roll and the value set by the tension setter 35. Calculator 36
Is calculated by. Then, the output value of the tension calculator 36 and the line speed signal (speed reference signal) are added by the adder 37, the value is input to the control device 26, the AC motor 24 is driven, and the tension roll 12 tensions the web. The web is being fed to the post-treatment device while controlling. In addition, the line speed signal (speed reference signal)
It is also input to the ramp function unit 31 of the speed control circuit of the unit.

The speed control circuit of the splice unit is
When the base paper of the B-axis 7 approaches the end, the automatic web joining is started. Then, the line speed signal input to the ramp function unit 31 is output as a signal having an inclination from the ramp function unit 31 by the web splicing start signal and input to the control device 22 to drive the AC servo motor 22. As a result, the splice unit 2 starts moving in the web feeding direction. The output of the ramp function unit 31 is compared with the line speed signal in the comparator 32, and when the output of the ramp function unit 31 becomes the same value as the line speed signal, the speed of the splice unit 2 is synchronized with the line speed. . The output of the comparator 32 is a speed tuning signal which indicates that the speed of the splice unit 2 has been tuned to the line speed.

When the moving speed of the splice unit 2 is synchronized with the line speed, the speed tuning signal causes the A-axis splice roll 8a to move to the B-axis side splice roll 8a.
Press on b and bond (join) the web. At the same time that the webs are bonded (joined), the B-axis side cutter knife 9b operates to cut the B-axis 7 (old base paper), and then the B-axis side brake bar 10b descends. The speed-tuned splice unit 2 is decelerated and stopped simultaneously with the completion of the web joining, and is fixed by the brake. Next, the splice unit 2 is moved from the stop position to the web jointing position on the old base paper side (B axis 7), and at the same time, the paper roll 11 is
Move to the new axis side (A axis 6). Until the automatic web joining is performed, the brake torque control circuit controls the brake torque of the unwinding shaft 7 (B axis).

The brake torque control circuit for the unwinding shaft 7 (B-axis) calculates or measures the mechanical loss of the tension roll 12 or the torque required for acceleration / deceleration in the torque setting device 38 in advance, and the calculated or measured value. To set. Then, the adder 3 serving as a reference signal of the AC motor 24
By inputting the output signal from No. 7 to the torque setting device 38, the mechanical loss of the tension roll or the torque value required for acceleration / deceleration according to the reference signal of the AC motor 24 is output. The output value is input to the subtractor 39, the torque feedback value from the tension roll speed control device 26 is subtracted, and a value obtained by calculating or measuring the mechanical loss of the tension roll or the torque required for acceleration / deceleration and the tension roll speed control device. The electropneumatic converter 27 is controlled so that the deviation from the torque feedback value from 26 is reduced, and the brake torque of the unwinding shaft 7 (B axis) is controlled while the web completes the automatic joining. That is, when the torque feedback of the tension roll 12 is larger than the torque setting value,
Since the AC motor 24 pulls the web, the tension on the entrance side is higher than the tension on the exit side of the tension roll, and the braking torque of the unwinding shaft 7 (B axis) is weakened. On the contrary, when the torque feedback of the tension roll is smaller than the torque setting value, the AC motor 24 is pulled by the web and the tension on the outlet side of the tension roll is higher than the tension on the inlet side. Control for increasing the brake torque of the unwinding shaft 7 (B-axis) is performed.

Even when the web is spliced from the A-axis 6 (old base paper) to the B-axis 7 (new base paper), the control arithmetic unit 30 carries out the same control.

FIG. 5 is a time chart for helping understanding of the operation of joining the web from the B-axis 7 (old base paper) to the A-axis 6 (new base paper). While referring to this time chart,
The switching from the old base paper (B-axis 7) to the new base paper (A-axis 6) will be described with time.

When the web is spliced from the old base paper (B-axis 7) to the new base paper (A-axis 6), first, the base paper of the A-axis 6 is attached to the A-axis side splice roll 8a corresponding to the A-axis 6 and the leading end of the web 1 is formed. Stick double-sided adhesive tape, etc. on the A-axis side brake bar 10
Raise a and sandwich it between the A-axis side splice rolls 8a. Then, when the base paper of the B-axis 7 approaches the end, automatic web splicing is started by the web splicing start signal.

Time t1; The B-axis side brake bar 10b of the splice unit 2 is raised by the web splicing start signal, and the web 1 is sandwiched. At the same time, splice
The brake fixing the unit 2 is released, and at the same time, the AC servomotor 21 is driven, and the splice unit 2 starts moving in the payout direction.

Time t2: When the moving speed of the splice unit 2 is synchronized with the line speed of the web on the output side, a speed tuning signal from the control arithmetic unit 30 causes the B-axis side splice roll 8b to move to the A-axis side splice roll 8a. Simultaneously with pressing the sheet, the B-axis side cutter knife 9b descends and cuts the old base paper (B-axis 7). Then, the web joining is completed on the new base paper (A axis 6). B-axis side splice roll 8b
After being pressure-bonded to the A-axis side splice roll 8a, the A-axis side brake bar 10a and the B-axis side brake bar 10b
Goes down.

Time t3: After a fixed time of speed tuning, the splice unit 2 starts deceleration.

Time t4: The splice unit 2 is fixed by the brake at the same time when the web joining is completed.

Time t5: The splice unit 2 (brake release) is moved to the web joint fixed position on the old base paper side (B axis 7), and at the same time, the paper roll 11 is moved to the new axis side (A axis 5).
Move to.

Time t6: The splice unit 2 is stopped at the web splicing fixed position, and at the same time, the paper roll 1
By also stopping 1 and setting a new base paper on the old base paper side (B axis 7), web splicing can be repeated.

Splices (crimping) on the A-axis side and the B-axis side
Time settings such as time, A-axis side and B-axis side brake bar crimping time, and A-axis side and B-axis side cutter knife lowering time are set by a timer in combination with a web splicing start signal and a speed tuning signal. .

FIG. 6 is a diagram showing the structure of a web automatic splicing device according to another embodiment of the present invention. This automatic web splicing device is capable of increasing the line speed by increasing the number of turns of the web between the unwinding shaft and the tension roll. This automatic web joining device is provided with a moving roll unit 18 on top of the splice unit 2 of the automatic web joining device shown in FIG. 1, and moves the moving roll unit in the same linear reciprocating manner as the splice unit 2. A roll unit moving mechanism section is provided, and this moving mechanism section drives the driving roll 3a.
And a drive belt 4a and a chain or a timing belt 5a. The drive rolls 3 and 3a are driven by the AC servo motor 21, and the splice unit 2 and the moving roll unit 18 are
It is linearly reciprocated as a unit.

Further, the automatic web splicing device of the present embodiment is provided with a paper roll unit 19, and this paper roll unit is driven integrally with the paper roll 11 by a moving mechanism section (not shown). As shown in FIG. 6, the web 1 includes an auxiliary roll, an A-axis side or a B-axis side splice roll (8a or 8b) of the splice unit 2 and a paper roll unit from the base paper of the A-axis 6 or the B-axis 7. 19, the moving roll unit 18, the paper roll 11, the tension roll 12, the web tension detecting roll 13, the line speed detecting roll 15, and the free roll 17 are sent to the subsequent processing device.

The other structure is the same as that of the automatic web splicing device of FIG. 1, and therefore, the same elements as those of FIG. 1 are designated by the same reference numerals. In this embodiment, except that the splice unit 2 and the moving roll unit 18 are linearly reciprocally driven integrally, and the paper roll 11 and the paper roll unit 19 are linearly reciprocally driven integrally. Since it operates exactly the same as the automatic web splicing device of FIG. 1, no further description of the operation will be given.

In each of the automatic web splicing devices of FIGS. 1 and 6, the synchronizing speed of the splice unit 2 is 100 m.
1 / min is a line speed of 100 m / min, but the automatic web joining device of FIG. 6 can increase the line speed to 300 m / min.

In the embodiment shown in FIG. 6, the splice unit 2 and the moving roll unit 18 are separate bodies.
These may be configured as one unit and driven by one moving mechanism section.

[0044]

According to the automatic web joining device of the present invention, unlike the prior art, the tension control is temporarily cut off at the time of web joining, and the unwinding old shaft is not decelerated and stopped by the strong brake. Since the web is spliced while moving in synchronism with the line speed, there is little fluctuation in tension when splicing the web, and continuous work can be performed. Also,
Since the accumulator for web splicing is not required, the apparatus can be downsized, and the work can be lightened. Therefore, it is possible to perform simple web splicing with high accuracy and high responsiveness.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a diagram showing a position of a splice unit before web splicing.

FIG. 3 is a diagram showing a position of a splice unit at the time of web joining.

FIG. 4 is a diagram showing a position of a splice unit after web splicing.

5 is a time chart diagram for explaining the operation of the embodiment of FIG. 1. FIG.

FIG. 6 is a diagram showing the configuration of another embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a conventional automatic web joining device.

[Explanation of symbols]

 1 web 2 splice unit 3,4 splice unit drive roll 5 chain or timing belt 6 A-axis unwinding shaft 7 B-axis unwinding shaft 8a A-axis side splice roll 8b B-axis side splice roll 9a A-axis cutter Knife 9b B-axis side cutter knife 10a A-axis side brake bar 10b B-axis side brake bar 11 Paper roll 12 Tension roll 13 Tension detection roll 14 Tension detector 15 Line speed detection roll 16 Speed detector 17 Free roll 18 Moving roll unit 19 Paper Roll Unit 21 AC Servo Motor 22,26 Control Device 23,25 Rotation Detector 24 AC Motor 27 Electro-Pneumatic Converter 28,29 Brake 30 Control Arithmetic Device 31 Ramp Function Unit 32 Comparator 33 Polarity Inverter 34 Subtractor 35 Tension setter 36 Tension calculator 37 Adder 38 Torque setter 39 Subtractor 40 Proportional integrator

Claims (5)

[Claims] 1. A web splicing device for splicing a web of one unwinding shaft to a web of the other unwinding shaft and sending the web, wherein a rotatable splice roll and a brake bar sandwiching the web between the splice rolls. A web automatic machine characterized by having a splice unit composed of a cutter knife for cutting the web, the splice unit being linearly reciprocally driven to perform web splicing when synchronized with the speed of the web. Splice device. 2. An electropneumatic converter for controlling the brake of the unwinding shaft, a paper roll for supporting the web fed from the splice unit, and a tension roll for controlling the web tension on the delivery side of the automatic web joining device. By a chain or timing belt stretched between the drive rolls, a splice unit moving mechanism that linearly reciprocates the splice unit, and a paper roll moving mechanism that moves the paper roll in an anti-parallel manner with the movement of the splice unit, The automatic web splicing device according to claim 1, further comprising: 3. A speed detector for detecting a line speed of a web, a first motor for driving the splice unit moving mechanism, a first controller for controlling the first motor, and a web tension. From a tension detector that detects the tension, a second motor that drives the tension roll, a second controller that controls the second motor, an output of the speed detector and an output of the tension detector. ,
Calculating a speed command to the first and second control devices,
A torque feedback value from the second control device,
The automatic web splicing device according to claim 2, further comprising a control calculation device that calculates a brake torque command to the electropneumatic converter from a speed command to the second control device. 4. A moving roll unit integrally driven with the splice unit, and a paper roll unit integrally driven with the paper roll, wherein the web from the unwinding shaft is the splice. .Unit, the paper roll unit, the moving roll,
4. The automatic web splicing device according to claim 3, wherein the automatic web splicing device is fed through a unit and the paper roll. 5. The automatic web splicing device according to claim 4, wherein the splice unit and the moving roll unit are configured as one unit.