JPH0313144B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the unwinding posture of a web in a web unwinding machine used in various web processing apparatuses for processing long strips such as paper, plastic film, and metal foil. It is something.

In general, various web processing devices for processing long strips such as paper, plastic films, and metal foils (hereinafter simply referred to as "webs") are designed to unwind the web during processing in order to improve work efficiency. When the processing is completed, the leading end of a new web is joined to the rear end of the web being processed, and the new web is continuously fed out for processing.

Conventionally, the overlapping and butt joining methods are known as web joining methods, and these joining methods are selected depending on the type of processing work. For example, when the processing work is coating processing or printing processing, The butt joint method is used. In one example of this butt joining method, the leading end of a new web to be joined is fixed by suction onto a splice board that has a large number of suction holes on a flat surface, and then cut along cutting grooves provided on the surface of the splice board. Cutting the leading end of the new web with a blade, removing unnecessary parts, and smoothing the edges, and when the web being processed is finished feeding out, the trailing end of the web being processed is suctioned and fixed to the splice board; Cut the rear end of the web with a cutting blade along the cutting groove, remove unnecessary parts, and smooth the edge. A joining tape is applied to these parts in a state where the leading edges are abutted against each other to join them. The splice board is usually provided with a regulating plate that regulates the widthwise position of the web, and the operator abuts the side edges of both the web being processed and the new web against this regulating plate. The unwinding direction of the web from the Noebro roll is regulated, and at the same time, both webs are aligned in the width direction and joined, so the width direction position of the web being processed and the new web after joining is Almost no deviation occurred.

By the way, in this type of butt joining method,
Conventionally, during joining work, the feeding of the web being processed was temporarily stopped, which stopped the web conveyance and hindered the continuous processing of the web. The conveyance to the device was not stopped, but only the feeding was temporarily stopped. However, this accumulator is composed of a large number of guide rolls, and if the web is, for example, a photographic film whose surface is coated with a photosensitive material, it may be susceptible to abrasions caused by contact between the guide rolls and the web and static electricity. In addition to causing damage to the film and causing film failure, a great deal of effort and time was wasted in maintaining the guide rolls.

Recently, however, a welding apparatus has been developed which is capable of butt welding without stopping the feeding of the web during processing, as disclosed in Japanese Unexamined Patent Publication No. 55-74940. What is required for webs spliced using such web splicing equipment is that the side edges of the web being processed and the side edges of the new web match at the joint, that is, the position of the side edges There should be no misalignment. The reason for this is that web processing equipment is usually equipped with a well-known web guide to prevent meandering conveyance of the web. When the web passes through the web guide, unreasonable stress is generated on the web, causing problems such as breakage of the joint or wrinkles at the joint, especially when the web processing device is a coating machine. This is because the coating liquid may adhere to the backing roller due to positional deviation at the joint, causing serious problems in quality. A similar problem also occurs when the unwinding direction of a new web from the web roll deviates from the planned direction.

By the way, as a web unwinding machine that supplies the web to the web butt splicing device, there is a known unwinding machine that controls the widthwise position of the web by sliding the entire unwinding machine in the widthwise direction of the web. When such an unwinding machine is used, the following problems occur.

First, the widthwise position of the web roll for the web being processed and the widthwise position of the web roll for the new web are generally not necessarily the same, and in this case, the entire unwinding machine must be slid. Since the relative relationship between the widthwise positions of both webs does not change even if the webs are controlled by moving, it is therefore not possible to match the positions of the side edges of both webs at the joint.

Second, since the entire unwinder is constantly sliding in the width direction of the web while being controlled according to the deviation of the widthwise position of the web during processing, it is difficult to empty the web from the unwinder. When removing the unwinding shaft or attaching the unwinding shaft with a new web wound thereon, it is very difficult to perform these operations automatically.

In order to solve the second problem, the sliding of the unwinding machine is temporarily stopped when the unwinding shaft is removed or installed, or the unwinding shaft is moved by a transport vehicle and an empty unwinding shaft. Some proposals have been made, such as installing a sliding mechanism on the transport vehicle for the unwinding shaft on which the new web is wound, so that the transport vehicle follows the sliding movement of the unwinding machine, but in the former case, Since the sliding movement of the unwinding machine is temporarily stopped, the widthwise position of the web being processed is not controlled during this stop period, which adversely affects the processing of the web in the web processing equipment. In this case, the disadvantage is that the structure of the transport vehicle becomes complicated and the equipment cost increases.

On the other hand, if a new web is pulled out from the web roll but its unwinding direction deviates from the planned unwinding direction (direction perpendicular to the unwinding axis of the web roll), There is no known effective means of modifying it to match.

The present invention has been made based on the above-mentioned circumstances, and its purpose is to change the direction of the end portion of a new web to be joined, which is pulled out from a web roll, ie, the unwinding direction of the web roll. It has the function of constantly correcting the direction perpendicular to the unwinding axis, and this unwinding direction correcting function is achieved smoothly and automatically, thereby moving the unwinding axis of the web roll in the axial direction. When the web roll is pulled out, the leading end of the web is moved in the width direction along with the unwinding shaft while maintaining its orientation extending in the planned unwinding direction, and the deviation in the widthwise position of the web roll is corrected. Accordingly, it is an object of the present invention to provide a web unwinding attitude control method that can automatically correct the unwinding direction.

The web unwinding posture control method according to the present invention provides a belt that moves in a scheduled unwinding direction perpendicular to the unwinding axis of a web roll, and a suction force applied to a subsequent web positioned on the belt through this belt. and a suction mechanism that applies suction force by this suction mechanism to at least two stages: a state of high suction force where the web is moved integrally with the belt, and a state of low suction force where the belt slides against the web. and a suction force switching mechanism that switches over the length of the web, and includes a web pull-out device that holds the pulled-out leading end of the trailing web to be joined to the rear end of the leading web at a position in front of the unwinding shaft of the web roll. Using a web unwinding attitude control device consisting of a
By sliding the belt against the leading end portion of the subsequent web while the suction force by the suction mechanism is small, a tensile force is applied in a planned unwinding direction perpendicular to the unwinding axis of the web roll. The present invention is characterized in that it includes a step of moving the unwinding shaft of the web roll related to the trailing web in the axial direction, thereby correcting the position in the width direction and correcting the unwinding direction of the trailing web.

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, W indicates the preceding web being processed and being fed out from the web roll 1 wound around the first unwinding shaft 7 to a web processing device (not shown); X indicates a new subsequent web that is joined to the rear end of the web W being processed and is fed out next after the feeding of the web W being processed is completed, and this new web The leading end portion Xa and the following portion are in a state of being pulled out from the web roll 2 wound around the output shaft 8.

Reference numeral 3 indicates a pivot shaft of the turret type web unwinding machine UW, and this pivot shaft 3 is rotatably supported at both ends by frames 4, 4' via bearing units 5, 5'. The center portion of the pivot shaft 3 is composed of a prismatic hollow pipe 301, and the shaft end portion 30 is supported by bearing units 5, 5'.
0,300' has a cylindrical shape, and one shaft end 300 has a hollow part 24 penetrating in the axial direction.
It has a hollow shaft. This shaft end 300
A rotary joint 6 is fixed to the
Connecting ports 23a, 23b, 23c, and 23d for connecting four hydraulic pipes from a hydraulic tank (not shown) and hydraulic pipes from hydraulic cylinders 21A and 21B, which will be described later, are connected to this rotary joint 6. Connection ports 23a', 23b'23c', 2 for
3d' are provided, and these connection ports 23a, 23
b, 23c, 23d are connection ports 23a', 2, respectively.
Rotary joint 6 at 3b', 23c', 23d'
are communicated internally. A slip ring (current collector ring,
(not shown) is installed, and the electrical equipment inside the unwinding machine UW and the external control device are electrically connected. Further, an electric motor (not shown) for driving rotation of the pivot shaft is connected to this shaft end 300'.

The first unwinding shaft 7 has both ends thereof connected to moving side chucking noses 9A each having a conical tip.
and the stationary chucking nose 10A. The moving side chucking nose 9A is rotatably supported by a moving side bearing bracket 11A so as to be able to reciprocate in the axial direction of the unwinding shaft 7 by an air cylinder (not shown) or the like. On the other hand, the fixed side tracking nose 10A is rotatably supported by the fixed side bearing bracket 12A. A magnetic powder brake 13A for tension control is attached to the fixed side bearing bracket 12A, and this magnetic powder brake 13A is attached to the fixed side tracking nose 10A.
It is keyed to the end of the shaft.

The moving side bearing bracket 11A and the stationary side bearing bracket 12A are connected and integrated by a column 14A. Sliding bearings 15A, 15A are attached to the lower part of each of the moving side bearing bracket 11A and the stationary side bearing bracket 12A, and these sliding bearings 15A, 15A are attached to the pivot shaft 3 along the length direction of the pivot shaft 3. The bearing guides 16A and 16A are fitted so as to be slidable on the bearing guides 16A and 16A, which are fixedly provided.

For safety, stoppers 17A, 17A are attached to both ends of the bearing guides 16A, 16A, respectively.

On the rotation axis 3, a web running position adjustment mechanism, for example, a hydraulic cylinder 21A is mounted on brackets 22A, 22A.
This hydraulic cylinder 2 is fixedly provided by
A clevis-type attachment 20A is screwed onto the tip of the piston rod 210A of 1A, and this attachment 20A is attached to the fixed side bearing bracket 1.
It is connected to a connecting pin 18A supported by a bracket 19A attached to the lower part of 2A.

The structure related to the second unwinding shaft 8 is also similar to the structure related to the first unwinding shaft 7 described above, and the same thing is indicated by the reference numeral B instead of the reference numeral A.

An opening 25 is provided in the center of the pivot shaft 3, and a connection port 23a' of the rotary joint 6 is connected to the opening 25.
Hydraulic piping (not shown) connected to 23b', 23c', and 23d' passes through the hollow part 24 of the shaft end 300 of the pivot shaft 3 and the hollow pipe 301 to the opening 25.
The connection ports 23″, 23b″, 2 of the hydraulic cylinders 21A, 21B are pulled out of the hollow pipe 301.
3c'' and 23d'', respectively.

Reference numeral 26 denotes a web drawing device for drawing out a new web. This web drawing device 26 is provided in a position in front of the unwinding shaft 8 of the web roll 2, and is a hollow box-shaped sac having a large number of suction holes 30 on the upper surface. Sucsion Box 29 and this Sucsion Box 2
A suction force switching mechanism (not shown) that switches the suction force generated by 9 into at least two stages of "strong" and "weak", and a multi-thread endless strip with through holes 28 bored along its length. The belt 27 and the suction box 29 move the endless belt 27 in a predetermined unwinding direction perpendicular to the unwinding shaft 8.
It consists of four guide rolls 31 stretched around the machine frame, and these guide rolls 31 are attached to a machine frame (not shown). suction box 2
Inside of 9 is a suction source such as a suction pump (not shown).
When the suction force of the suction box 29, that is, the internal pressure of the suction box 29 is switched to "strong" by the suction force switching mechanism, the magnitude of the suction force is determined by the suction force that is transmitted through the endless belt 27. The size is set so that the new web placed on the top surface of the printing box 29 can be conveyed in close contact with the endless belt 27 at the same speed, and the magnitude of the suction force when switched to "weak" is as follows: When the rotation of the web roll 2 is suppressed, the endless belt 27 moves the tip of the web
It is said to be large enough to slide on the bottom surface of Xa. One of the guide rolls 31 is connected to a driving electric motor (not shown).

Reference numeral 32 designates a first detection mechanism that detects the widthwise position of the web W being processed, which is fed out from the web roll 1 wound around the unwinding shaft 7, and this first detection mechanism 32 is shown in FIG. It is composed of a pair of, for example, pneumatic sensors, which are arranged opposite to each other with a preset web running position indicated by a dashed line, that is, a web running position 34 where the right edge of the web W is located, for example. It is located on the exit side.

Reference numeral 33 indicates a second detection mechanism for detecting the widthwise position of the new web X that is fed out from the web roll 2 wound around the unwinding shaft 8. This second detection mechanism 33 is shown in FIG. As shown in FIG. 2, it is composed of a pair of, for example, pneumatic sensors, which are arranged opposite to each other across the extension line of the web running position 34 on the entrance side of the web pulling device 26, and moves the web X from the waiting area PX by an appropriate driving means. It is possible to exit.

Guide rolls 35 and 36 are rotatably supported on a machine frame (not shown).

The first detection mechanism 32 and the second detection mechanism 33 are connected so that a hydraulic pressure adjustment mechanism (not shown) is controlled by their detection signals.
In the state shown in FIGS. 1 and 2, the first
Based on the detection signal from the detection mechanism 32, the unwinding shaft 7
The hydraulic cylinder 21A associated with the unwinding shaft 8 is operated based on the detection signal from the second detection mechanism 33, and the hydraulic cylinder 21B associated with the unwinding shaft 8 is operated.
When the rotating shaft 3 rotates 180 degrees and the positions of the unwinding shafts 7 and 8 are reversed, an automatic switching mechanism (not shown) switches the hydraulic pressure on the unwinding shaft 8 to be located at the upper position. The cylinder 21B is activated based on the detection signal from the first detection mechanism 32, and the hydraulic cylinder 21A associated with the unwinding shaft 7 located at the bottom is activated based on the detection signal from the second detection mechanism 33. In response to each detection signal, the unwinding shaft associated with each detected web is moved in a direction opposite to the direction in which the side edge of the web is deviated from the web running position 34. Hydraulic cylinders associated with each unwinding shaft are actuated to force the unwinding.

In the above configuration, the web is unwound as follows.

The web W being fed out from the web roll 1 is guided by the guide roll 35 and is guided by the first detection mechanism 3
2, the web W is transported to a web processing apparatus, where the web W is processed. First detection mechanism 32
For example, as shown in FIG. 3, when the right edge WR of the web W is deviated leftward by a distance L ₁ from the web running position 34, the detection signal from the detection mechanism 32 causes the piston rod 210A to be attracted. The hydraulic cylinder 21A is operated, and the bearing brackets 11A and 12A integrally slide on the bearing guides 16A and 16A, and the unwinding shaft 7 moves rightward along the length of the rotating shaft 3. Then, as the unwinding shaft 7 moves, the web W starts to move to the right in the width direction.
When the right edge WR of the web W matches the web running position 34, the detection signal obtained at this time stops the operation of the hydraulic cylinder 21A, and the web W is conveyed with the right edge WR matching the web running position 34. . When the right side edge WR of the web W is deviated in the opposite direction to the above case, that is, to the right, the hydraulic cylinder 21A operates to extend the piston rod 210A in response to a detection signal from the detection mechanism 32. Due to this, the unwinding shaft 7 is rotated to the rotation shaft 3.
The web W moves to the left along the length direction, and as the unwinding shaft 7 moves, the web W starts to move to the left in the width direction, and when the right edge WR of the web W coincides with the web running position 34, The detection signal obtained at this time stops the operation of the hydraulic cylinder 21A, and the web W is conveyed with its right edge WR aligned with the web running position 34.

While the web W is being fed out, the tip portion Xa of the web X drawn out from the web roll 2 mounted on the unwinding shaft 8 is placed on the web drawing device 26 via the guide roll 36. At this time, the second detection mechanism 33 has moved out of the web X waiting area PX. The leading end portion Xa of the web X positioned on the web pull-out device 26 is indicated by a broken line in FIG.
The unwinding shaft 8 is not necessarily pulled out to the position shown by H ₁ , but is normally deviated obliquely to the perpendicular direction of the unwinding shaft 8 as shown by the two-dot chain line H ₂ , that is, the actual It is often the case that the unwinding direction is different from the planned unwinding direction. Position control including unwinding direction control of the web X pulled out in such a state will be described below. The magnetic powder brake 13 related to the unwinding shaft 8 is activated by the web X position correction start signal.
B is excited, a braking force is applied to the unwinding shaft 8, and the rotation of the web roll 2 is stopped and suppressed. The magnitude of this braking force is determined by the suction box 29
When the internal pressure is "weak", the web drawing device 2 described later
When the internal pressure of the suction box 29 is "strong", it is smaller than the tensile force F caused by the suction of the web drawing device 26.

Next, the inside of the suction box 29 is suctioned by a suction source to create a negative pressure, and the endless belt 27
A suction force is applied to the tip portion Xa of the web X through the suction box 29, but at this time the internal pressure of the suction box 29 is set to "weak". When the internal pressure of the suction box 29 reaches the internal pressure set to "weak", the driving electric motor is activated, which rotates the guide roll 31 and causes the endless belt 27 to rotate.
moves in the planned unwinding direction as if sliding on the suction box 29. The suction force thus exerted through the through hole 28 of the endless belt 27;
A tensile force F having a magnitude determined by the coefficient of friction between the web X and the endless belt 27 and directed in the intended unwinding direction is generated as shown in FIG. This tensile force F is the force in the longitudinal direction of the tip portion Xa of the web
Since the force is divided into f ₁ and force f ₂ that acts in a direction perpendicular to this force f ₁ , the unwinding direction of the tip portion Xa of the web X is gradually corrected by this force f ₂ , and finally is immediately pulled out in the planned unwinding direction perpendicular to the unwinding shaft 8, which is the position shown by the broken line _H1 in FIG. By sliding against the tip end Xa of X, it is always applied to the tip end Xa.

Next, the internal pressure of suction box 29 is "weak".
The second detection mechanism 33 moves forward to the web running position 34 while the state continues and the endless belt 27 continues to be driven. When the position in the width direction of the leading end portion Xa of the web X, that is, the position of the right side line _XR of the web 2
Hydraulic cylinder 21B operates to extend bearing bracket 10B, thereby extending bearing brackets 11B and 12B.
slides integrally on the bearing guides 16B, 16B, and the unwinding shaft 8 moves to the left along the length direction of the rotating shaft 3.

When the unwinding shaft 8 moves in this way, if the pulled out tip portion Xa is simply held, the unwinding shaft 8 will move without the tip portion Xa moving.
As a result, the web roll moves at the same time, resulting in the unwinding direction being deviated from the planned direction. However, in the present invention, the tip portion Xa of the web
There is an endless belt 2 that slides against it.
Since the unwinding direction correction action by 7 is always applied, as will be described in detail later, when the unwinding shaft 8 moves, the leading end portion Xa of the web While maintaining the direction, the web X moves to the left in the width direction together with the unwinding shaft 8, and when the right side line XR of the web X coincides with the web traveling position 34, the detection signal obtained at this time causes the hydraulic cylinder 21B to move. is stopped, and the web X is controlled so that its right edge XR coincides with the web running position 34. web x
If the right side edge XR of
The hydraulic cylinder 21B is actuated to suck the piston rod 210B in response to the detection signal of Due to the unwinding direction correction action of the endless belt 27, the web X moves to the right in the width direction while maintaining the planned unwinding direction, and thus the right edge XR of the web X moves to the web running position 34.
If it matches, the detection signal obtained at this time stops the operation of the hydraulic cylinder 21B, and the web
is controlled so that its right side edge XR coincides with the web running position 34.

In this way, when the right side edge XR of the web X coincides with the web running position 34 while the unwinding direction of the drawn-out tip portion Xa is maintained in the planned direction, the rotation of the guide roll 31 is stopped. The web X is stopped, and the web X waits on the stopped endless belt 27 while being attracted by the suction box 29. Next, when the feeding of the web roll 1 is almost completed and the web joining cycle begins, the internal pressure of the suction box 29 is switched to "strong", the guide roll 31 is driven again, and the endless belt 27 is controlled at the conveyance speed of the web W. As a result, the web X is conveyed together with the endless belt 27 and sent to the web joining device, where the webs W and the webs X are butt joined.

When the joining of web W and web X is completed, the second
The detection mechanism 33 is removed from the waiting area PX of the web The unwinding shaft 7 is removed and a new web roll is attached to it in preparation for the next joining operation. Then, as the rotation shaft 3 rotates 180 degrees, the supply paths of the detection signals from the first detection mechanism 32 and the second detection mechanism 33 are switched, and the cylinder 21A related to the unwinding shaft 7 is connected to the second detection mechanism 33.
The cylinder 21B associated with the unwinding shaft 8 is controlled by the detection signal from the first detection mechanism 32.

As described above, according to the present invention, the rotation of the web roll 2 related to the web X is suppressed and further feeding is prohibited for the leading end portion Xa of the web X that has been pulled out. A web unwinding device having a belt that moves in the unwinding direction and a suction mechanism consisting of a suction box or the like that applies suction force through this belt causes the web As a result of applying a tensile force directed toward the tip and correcting the unwinding direction by this tensile force, the direction of the tip portion Xa can be reliably and automatically corrected. The unwinding direction correcting action by this belt is always performed at the tip of the web
Added to Xa.

In the above correction operation in the unwinding direction, no excessive force is applied to the web X including the tip portion Xa, so there is no risk of wrinkles or damage to the web.

In addition, in the web drawing device, the through hole 28
By using the endless belt 27 in which a Since the web is moved in a direction and a tensile force is applied in that direction as a whole, the unwinding direction of the web is completely aligned with the planned unwinding direction.

In addition, by making it possible to switch the suction force of the suction mechanism so that the above-mentioned control of the unwinding direction is achieved when the suction force is set low, the web The tip portion Xa of the X can be forcibly held and put on standby or moved.

On the other hand, the unwinding shafts 7 and 8 are provided so as to be movable independently in the longitudinal direction, and the unwinding shafts 7 and 8 are capable of handling the webs W and
The movement of webs W and
The unwinding shafts 7 and 8 can be moved to respective set positions.

As described above, the action of correcting the unwinding direction of the leading end portion of the web by the web unwinding device 26 and the correction of the deviation of the position in the width direction of the web by moving the unwinding shaft of the web roll in the axial direction are, in principle, Although these are separate matters, in reality, both operations are performed in parallel as follows.

That is, as for the subsequent web
Since the unwinding direction is always corrected by the sliding of the belt, when the unwinding shaft 8 of the web roll 2 related to the web X is moved in the axial direction, the leading end portion Instead of being deviated from the unwinding direction, the tip portion Xa is unwound in the planned unwinding direction from the position of the web roll after the movement, that is, the position in the width direction of the web roll after the movement. The unwinding direction correction action of the belt causes the belt to move until it is directed in a direction perpendicular to the unwinding axis. Moreover, since the movement of this tip portion Xa occurs together with the movement of the unwinding shaft, the tip portion Xa of the web X pulled out from the web roll is hardly deformed due to the movement of the unwinding shaft of the web roll.
Therefore, it slides on the belt together with the unwinding shaft and the web roll while its own shape and the shape relative to the web roll are held almost fixedly.

Therefore, correcting the deviation in the widthwise position of the web X by moving the web roll in the axial direction;
In fact, both the correction of the width direction position and the correction of the unwinding direction of the leading end portion Xa of the drawn web This can be achieved automatically, and as a result, the posture of the drawn-out tip portion of the web can be easily and reliably controlled to the desired state in terms of the width direction position and the unwinding direction.

In the above-mentioned operation, there is almost no deformation in the pulled-out end portion Xa of the web, so as mentioned above, no excessive force is applied to the web There is no risk of causing or damaging the product.

As is clear from the above description, according to the method of the present invention, it is possible to control the unwinding attitude of the succeeding web so that it is in the expected unwinding direction at a predetermined widthwise position with respect to the leading web. Therefore,
To feed both webs into a state where the leading end of a new web can be joined to the rear end of the web being processed without causing any positional deviation in the width direction of both webs, without stopping the feeding of the web being processed. Can be done.
When removing the empty unwinding shaft and installing the unwinding shaft with a new web wound around it, the removal and installation are performed while continuing to control the widthwise position of the web being processed. Since only the movement control of the unwinding shaft can be stopped independently, the web being processed can be stably transported to the set running position, while the empty unwinding shaft can be removed and a new web can be moved. It becomes possible to automatically attach the unwinding shaft wound with the material using simple equipment. In addition, compared to the conventional case where the entire unwinding machine is made to slide, the hydraulic cylinder for sliding drive only needs to be smaller, and the weight borne by the hydraulic cylinder is smaller, resulting in faster control response. Benefits can be obtained.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment.
Various changes are possible. For example, a pneumatic cylinder or an electric motor may be used instead of the hydraulic cylinder as a drive source for controlling the movement of the unwinding shaft. When using an electric motor, rotary joint 6,
Although the hollow portion 24 in the shaft end 300 and the opening 25 in the pivot shaft 3 are not necessary, the structure requires a current collecting ring and the like for electrical wiring. Also, depending on the type of web, reflective phototube sensors may be used instead of the pneumatic sensors as the detection mechanisms 32 and 33. In this case, if the sensors are installed in the suction box 29, the rotation axis 3 Since the movement of the web conveyance path accompanying rotation is not obstructed, a mechanism for moving the sensor forward and backward is not required.

Furthermore, in the embodiments described above, both the first unwinding shaft 7 and the second unwinding shaft 8 are provided movably and are configured to be able to independently control their movement, but the traveling position of the web is is not particularly set and the relative hand positional relationship between the web W and the web X is a problem, it is also possible to configure so that only one of the unwinding shafts 7 and 8 can be freely controlled. In this case, the movement of the movably provided unwinding shaft is controlled so that the running position of the web related to the movably provided unwinding shaft matches the running position of the web related to the fixedly provided unwinding shaft. do it.

In addition, in cases where the web running position does not need to be set, if both unwinding shafts are provided movably, the deviation of the web running position relative to each unwinding shaft is approximately half the distance. Since it is only necessary to control the movement of each unwinding shaft, the advantage of fast control response speed can be obtained.

As described above, according to the present invention, if the unwinding direction of the leading end portion of the new subsequent web pulled out from the web roll and to be joined to the preceding web deviates from the planned unwinding direction, this The unwinding direction can be corrected smoothly and reliably, and can be done automatically.Moreover, this unwinding direction correcting action can be performed by moving the unwinding shaft of the succeeding web in the axial direction, thereby adjusting the widthwise position of the web. Since this is performed in parallel with the corrective action of can be carried out with high work efficiency.

[Brief explanation of the drawing]

FIGS. 1 and 2 are an explanatory front view and an explanatory side view, respectively, showing an example of the apparatus used in the method of the present invention, and FIG. 3 is an explanatory view schematically showing the state of the widthwise position of the web. . 1, 2... Web roll, W, X... Web,
7, 8... Unwinding shaft, 3... Rotating shaft, UW... Turret type unwinding machine, 4, 4'... Frame, 5,
5'...Bearing unit, 300, 300'...
...Shaft end, 301...Hollow pipe, 6...Rotary joint, 21A, 21B...Hydraulic cylinder, 9A, 9B...Moving side tracking nose,
10A, 10B...Fixed side chucking nose,
11A, 11B...Moving side bearing bracket, 12
A, 12B...Fixed side bearing bracket, 13A,
13B...Magnetic powder brake, 14A, 14B...
Pillar, 15A, 15B...Sliding bearing, 16
A, 16B...Bearing guide, 17A, 17
B... Stopper, 22A, 22B... Bracket, 210A, 210B... Piston rod, 2
0A, 20B... Attachment, 19A, 19
B... Bracket, 18A, 18B... Connection pin, 25... Opening, 24... Hollow part, 26...
Web drawing device, 30... Suction hole, 29... Suction box, 28... Through hole, 27... Endless belt, 31... Guide roll, 32...
...First detection mechanism, 33...Second detection mechanism, 3
4... Web running position, PX... Standby area, 35,
36...Guide roll, WR, XR...Right edge,
Xa...Tip part.

Claims (1)

[Claims] 1. A belt that moves in a scheduled unwinding direction perpendicular to the unwinding axis of a web roll, and a suction mechanism that applies suction force to a subsequent web positioned on the belt through this belt. , a suction force that switches the suction force by this suction mechanism into at least two stages: a high suction force state in which the web is moved integrally with the belt, and a low suction power state in which the belt slides against the web. A web unwinding device comprising a switching mechanism and a web unwinding device that holds a pulled out tip of a trailing web to be joined to a trailing end of a leading web at a position in front of an unwinding shaft of a web roll. Using a posture control device, the rotation of the web roll is suppressed while the leading end of the trailing web is pulled out from the web roll, and the belt is moved against the leading end of the trailing web while the suction force by the suction mechanism is small. By sliding, the unwinding axis of the web roll related to the subsequent web is moved in the axial direction while applying a tensile force in the scheduled unwinding direction perpendicular to the unwinding axis of the web roll, thereby A method for controlling a web unwinding posture, comprising the steps of: correcting the widthwise position and correcting the unwinding direction of a succeeding web.