JPH0212856B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the tip of a web (a flexible strip of paper, plastic, metal foil, etc.) that is fed out from a preceding web roll is butted against the rear end of a web (a flexible strip of paper, plastic, metal foil, etc.) that is fed out from a preceding web roll. The present invention relates to a web butt splicing device that joins the web and sends it out to a web processing device or the like as a continuous web.

Traditionally, Japanese Patent Publication No. 48-38461 and Japanese Patent Publication No. 1973-
The web butt joint device described in each specification of No. 84670 is known.

However, as described in JP-A No. 50-84670, the former device feeds the subsequent web (new web) after cutting to the joint with the web end free, so it is particularly thin and stiff. In the case of a trailing web having a weak bond, the leading end of the trailing web cannot be reliably fed to the joint, and therefore, it is difficult to achieve a good joint.
The latter device eliminates this drawback; the tip of the subsequent web after cutting is held in the cutting/splicing drum and sent to the splicing processing section, and the cutting/splicing drum and the adhesive tape are held in the processing section. The tape application drum works together to butt and join the old and new webs (preceding and subsequent webs). In the case of this device, if the leading end of the trailing web after cutting can be reliably held, a good butt joint can be expected, but the following problems remain for practical use.

First of all, this apparatus uses a push-cutting method as a web cutting method to create the joining end portion, but the push-cutting method cannot reliably cut the web when it becomes thick.

Second, this device basically brings two cylinders into contact, cuts the web on a tangent line to create a splicing end, and uses a suction hole at the rear of the cutting tool to create a splicing end for the trailing web tip. However, since there is almost no hugging angle upstream of the cut end of the subsequent web relative to the cutting/splicing drum, in the case of thick webs, it is used to hold the subsequent web after cutting. Even if the web is thin, the tension applied to the web between the tangent line and the feed-out shaft causes the trailing web to behave as if it is being pulled back toward the feed-out shaft, making it impossible to securely hold the leading end of the trailing web.

Thirdly, generally speaking, the side edge positions of the preceding web and the side edges of the succeeding web do not match, so when butt joining is performed using this device,
The side edges of the web before and after the butt joint may be misaligned, and serious trouble may occur when this portion passes through a web processing machine, particularly a coating machine or a printing machine.

Fourth, this device cuts and joins webs in a running state, but the cutting/splicing drum, which is stopped before joining, is rapidly accelerated to a circumferential speed commensurate with the running speed of the web during butt joining. However, once the welding is completed, it must be rapidly decelerated and stopped at a fixed position. Therefore, the faster the web travels, the larger the electric motor that drives the cutting and splicing drum becomes.
Additionally, a complicated and precise speed control device is required, increasing the cost of the device.

The present invention has been made in view of the drawbacks of the conventional devices, and its first object is to provide a web butt splicing device that can reliably cut a web regardless of the thickness of the web. The purpose of this is to provide a web butt splicing device that can reliably hold the leading edge of a trailing web after cutting, and the third purpose is to prevent deviations in the side edge positions of the leading and trailing webs before and after the butt joint. A fourth object is to provide a web butt splicing device, and a fourth object is to provide a web butt splicing device without using a complicated speed control device or a large electric motor.

The configuration of the present invention that achieves these objects has a lower cutting blade disposed in the widthwise direction of the web, and is capable of rotation and movement in the widthwise direction of the web while the web is suctioned and held on the cylindrical surface. a cutting/splicing drum; a first cutting device for cutting the leading edge of the subsequent web sucked into the cutting/splicing drum with an upper cutting blade that moves along the lower cutting blade; A nip roll that nips the leading web overlapped with the cut end portion of the trailing web in cooperation with the cutting/splicing drum, and an upper cutting blade that moves the leading web nipped by the nipping roll along the lower cutting blade. and a tape applying drum that cooperates with the cutting/splicing drum to nip the butted web and affix an adhesive tape to the abutted portion of the web that passes through the nip point. When the leading end of the trailing web is cut by the first cutting device, the cutting/splicing drum sucks and holds the trailing web with slack on the feeding side of the trailing web. That is.

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

In FIGS. 1 to 4, 1 is a turret type unwinding machine, and its turret arm 1a is provided with two unwinding axes X and Y. In FIG. 1, a web roll 2a is attached to a feeding shaft X, and the web 2 is fed from the web roll 2a and sent via a guide roll 30 to a web processing device (not shown). Further, a web roll 3a is attached to the feeding shaft Y (in this figure,
Web 2 is the leading web and web 3 is the trailing web). Each feeding axis X, Y has a web 2,
A powder brake for controlling the feeding tension of the webs 2 and 3 and an electric motor for rewinding the webs 2 and 3 to the web rolls 2a and 3a are installed (not shown). A sliding bearing 1b that fits into a sliding guide rail 4 laid on the floor surface E is fixed to the lower part of this turret type unwinding machine 1, and when a force is applied from a fluid pressure cylinder (not shown), the turret unwinds. The mold unwinding machine 1 is configured to be able to slide in the widthwise direction of the web.

Reference numeral 5 denotes a cutting and joining drum having a double cylindrical structure, and is composed of a drum inner cylinder 10 fixed to a support frame 15 and a drum outer cylinder 6 rotatably attached to the drum inner cylinder 10. The drum outer cylinder 6 has a large number of ventilation holes 7, a linear lower cutting blade 8 disposed in the width direction of the webs 2 and 3, and a later-described upper cutting blade 1.
It is a hollow cylinder having a groove 9 wider than the thickness of the grooves 8 and 21. The drum inner cylinder 10 is also a hollow cylinder with partition walls 14 made of a wear-resistant material extending horizontally from its inner and outer surfaces. The tip of this partition wall 14 is in sliding contact with the inner peripheral surface of the drum outer cylinder 6, and the inside of the drum outer cylinder 6 is divided into two hollow chambers 13a,
It is divided into 13b. Furthermore, the inside of the drum inner cylinder 10 is also divided into two hollow chambers 12a and 12a by the partition wall 14.
One hollow chamber 12a is connected to a hollow chamber 13a, and the other hollow chamber 12b is connected to a hollow chamber 13b through a large number of ventilation holes 11. The hollow chambers 12a and 12b are both connected to a pressure reducing device (exhaust pump, etc.) and a pressurizing device (compressor, etc.) not shown, and can be depressurized or pressurized by switching valves not shown.
A sliding bearing 15a is fixed to the lower end of the support frame 15, and is fitted with a sliding guide rail 16 laid on the floor E, and the cutting/joining drum 5 is moved by a hydraulic cylinder (not shown). It is capable of sliding in the width direction of the web.

Reference numeral 17 denotes a first cutting device that cuts the leading end of the trailing web 3 to form a joining end, and is moved forward or backward in the direction of arrow A in FIG. 1 by a drive device (not shown). The cutting device 17 includes a drive device (not shown) that traverses the upper cutting blade 18 in the web width direction. As for the configuration of the drive device for the upper cutting blade 18, the upper cutting blade 1
When 8 is a circular cutting blade, it is necessary to also provide a mechanism for rotating the circular cutting blade during traversal, and
When the upper cutting blade 18 is a knife blade such as a razor, it is sufficient to perform only traversing. The shape of the upper cutting blade 18 is appropriately selected depending on the type of the webs 2 and 3.

20 is a second cutting device having an upper cutting blade 21;
22 is a nip roll, and in this embodiment, both constitute the cutting unit 19. The second cutting device 20 is fixed to the frame 23 and has an upper cutting blade 21.
The leading web 2 is cut by traversing in the web width direction. The nip roll 22 is rotatably supported by a frame 23. The cutting unit 19 receives force from a drive device (not shown) and moves up or down in the direction of arrow B.

Reference numeral 24 denotes a tape application drum having a double cylindrical shape, which is rotatably supported by a frame 29, and has a large number of ventilation holes 25 and 2 in its outer and inner cylinder parts, respectively.
6 is drilled. Moreover, hollow chambers 27a and 27b are formed between the outer cylinder part and the inner cylinder part, and hollow chambers 27c and 27d are formed inside the inner cylinder part. The hollow chamber 27c connected to the hollow chamber 27b is connected to a pressurizing device and a pressure reducing device through a rotary joint (not shown), and can be selectively pressurized or depressurized by a switching valve. Further, a hollow chamber 27d that is electrically connected to the hollow chamber 27a
is connected to a pressurizing device via a rotary joint (not shown). The tape application drum 24 is rotationally driven by an electric motor and an electromagnetic clutch (not shown), so that the tape application drum 24 can be stopped at a fixed position. The frame 29 is moved up and down in the direction of arrow C in FIG. 1 by a drive device (not shown). 28 is a single-sided adhesive tape for web joining which is held by suction on the tape application drum 24.

31 is a first web position detector that detects the amount of deviation of the side end position of the leading web 2 from the reference running position 33 (indicated by a two-dot chain line in FIG. A connected fluid pressure cylinder (not shown) is operated to slide the turret type unwinder 1 in the widthwise direction of the web, thereby aligning the side end position of the leading web 2 with the reference running position 33. 3
2 is a second web position detector that detects the offset position of the side end position of the subsequent web 3 suctioned and held on the cutting/splicing drum 5 from the reference running position 33, and connects it to the cutting/splicing drum 5. A hydraulic cylinder (not shown) is operated to slide the cutting/splicing drum 5 in the widthwise direction of the web, thereby aligning the side end position of the following web 3 with the reference running position 33.

Next, the operation of the apparatus of the present invention having the above configuration will be explained.

In FIG. 1, the leading web 2 has a feed-out axis X
The web is continuously fed out from a leading web roll 2a mounted on the web, passes through a guide roll 30 and a first web position detector 31, and is sent to a web processing machine (not shown). This first web position detector 3
1 detects the amount of deviation L ₁ of the side end position of the leading web 2 with respect to the reference running position 33, and connects a fluid pressure cylinder (not shown) to the turret type unwinding machine 1 so that the amount of deviation L ₁ becomes zero. Drive control. The web butt splicing work is carried out just before the preceding web 2 runs out.
a is suctioned to negative pressure by a pressure reducing device (not shown), and the hollow chamber 13a is also suctioned to negative pressure through the vent hole 11. In this work, the worker places the following web roll 3 on the cutting/splicing drum 5 in the above state.
It begins by pulling out and placing the trailing web 3 from a. As a result, the following web 3 is sucked into the ventilation hole 7 and held on the drum outer cylinder 6.

The subsequent web 3 may be placed on the cutting/splicing drum 5 at any position in the web width direction. The reason for this will be explained below. Now, as shown in FIG.
Suppose that it is pulled out diagonally from a and held on the drum outer cylinder 6 by suction (the position indicated by the dashed-dotted line). When the drum outer cylinder 6 is rotationally driven by a drive device (not shown) in this state, the trailing web 3 is subjected to a tensile force F due to the suction force through the ventilation holes 7. but,
The braking force of the powder brake (not shown) of the feeding shaft X to which the trailing web roll 3a is attached is as follows:
F is selected to be larger than F to prevent the subsequent web 3 from being fed out. As a result, the trailing web 3 slides on the drum outer cylinder 6. here,
As shown in Figure 2, the tensile force F can be decomposed into a force (component) f ₁ in the direction of pulling out the web and a force (component) _{f 2} perpendicular to this f ₁ . The web 3 slides sideways and appears to be pulled straight out from the trailing web roll 3a, as shown by the broken line in FIG. Therefore, there is no particular problem even if it is initially pulled out diagonally.

When this web position setting operation is completed, the drum outer cylinder 6 stops at the normal position shown in FIG. 3a, where the lower cutting blade 8 is directly above. Next, the hollow chamber 12b in the cutting/joining drum 5 is sucked to negative pressure by a pressure reducing device (not shown), and the hollow chamber 13b communicating with this hollow chamber 12b through the ventilation hole 11 is also sucked to negative pressure. .
At the same time, the powder braking force of the feeding shaft X is released, and the drum outer cylinder 6 is rotated again to the normal position shown in FIG. 3b. When the fixed position is reached, the powder brake of the feeding shaft X is applied again, and the drum outer cylinder 6 is driven to rotate in the opposite direction to the fixed position shown in FIG. 3c. Due to this reversal of the drum outer cylinder 6, the trailing web 3 between the trailing web roll 3a and the drum outer cylinder 6 becomes slack. When the drum outer cylinder 6 stops at the fixed position, the first
The cutting device 17 moves in the direction of arrow A in FIG. 1, and its upper cutting blade 18 enters the groove 9 on the drum outer cylinder 6 and engages with the lower cutting blade 8. Next, a drive device (not shown) incorporated in the first cutting device 17 is activated, and the upper cutting blade 18 is traversed in the web width direction to cut the leading end of the subsequent web 3. When the cutting is completed, the first cutting device 17 is separated from the cutting/joining drum 5, and the hollow chamber 12b, which has been suctioned to negative pressure, is connected to a pressurizing device (not shown) by switching the valve. As a result, the leading end of the subsequent web 3 cut in the above operation is transferred to the cutting/splicing drum 5 as shown in FIG. 3d.
be excluded from Next, the second web position detector 32 is activated, detects the amount of deviation L ₂ (see Fig. 2) of the side end position of the trailing web 3 from the reference running position 33, and activates the hydraulic cylinder (not shown). The cutting/splicing drum 5 is driven to slide in the widthwise direction of the web, and the side end position is made to coincide with the reference running position 33. At this time, as mentioned above, the trailing web 3 between the trailing web roll 3a and the cutting/splicing drum 5 is slack, so even if the cutting/splicing drum 5 slides in the width direction of the web, it has already been suctioned and held. Subsequent web 3
No excessive force is applied to the tip. Therefore, no relative positional deviation occurs between that part and the drum outer cylinder 6. When the side edge alignment of the trailing web 3 is completed, the drum outer cylinder 6 is moved as shown in FIG. 3e.
Further, it is driven in the reverse direction to the home position, and the welding preparation operation for the subsequent web 3 is completed.

On the other hand, the hollow chamber 27c of the tape application drum 24
The hollow chamber 2 is connected to a pressure reducing device (not shown) and communicated with the hollow chamber 27c through the ventilation hole 26.
7b is drawn to negative pressure. Next, the tape applying drum 24 receives a single-sided adhesive tape 28 (the outer side is the adhesive surface) for web joining onto the outer cylinder surface of the hollow chamber 27b from a single-sided adhesive tape feeder (not shown), and holds it by suction. do. After the adhesive tape 28 is suctioned and held, the electromagnetic clutch and electric motor for driving the tape applicator drum 24 are activated to rotate the tape applicator drum 24 to a home position. Here, the normal position of the tape applicator drum 24 is defined as the circumferential length from the cutting point S to the joining point N and the adhesive tape 28 when the tape applicator drum 24 is lowered to the position shown in FIG. 4 in the operation described later. This refers to a position where the circumferential length from the tape width dividing point T to the joining point N is approximately equal. When the side end positioning of the succeeding web 3 and the suction and holding of the adhesive tape 28 onto the tape application drum 24 are completed, all preparatory operations for web butt joining are completed.

When the feeding of the leading web 2 is completed, a nip roll (not shown) installed downstream of the guide roll 30 is operated to stop feeding the leading web 2. Furthermore, even if the feeding of the preceding web 2 stops, so that the web processing machine (not shown) can continue processing, an accumulator (not shown) operates simultaneously with the stopping of feeding, so that the web processing machine (not shown) can continue processing. We supply the web. When the feeding of the leading web 2 is stopped, the cutting unit 19 and the tape applying drum 24 are lowered, and the nip roll 22 and the tape applying drum 23 in the cutting unit 19 press the leading web 2 against the cutting and splicing drum 5. or,
After this pressing operation, the upper cutting blade 21 of the second cutting device 20 enters the groove 9 of the cutting/joining drum 5 and engages with the lower cutting blade 8. Tape pasting drum 2
After the leading web 3 is nipped by the cutting/splicing drum 4 and the cutting/splicing drum, the electromagnetic clutch (not shown) of the tape application drum 24 is released, and the tape application drum 24 becomes free roll. Since the hollow chambers 12a and 13a in the cutting/splicing drum 5 have already been suctioned to negative pressure, the leading web 2 is sucked onto the surface of the drum outer cylinder 6 by the nip between the tape applying drum 24 and the cutting/splicing drum 5. Retained. In this state, a drive device (not shown) incorporated in the second cutting device 20 cuts the leading web 2 by traversing the cutting upper blade 21 in the web width direction. When the cutting is completed, the cutting unit 19 moves upward in the direction of arrow B in FIG. 1 and leaves the cutting and joining drum 5. Thereafter, a rewinding motor (not shown) connected to the feed-out shaft X is activated to rewind the unnecessary portion of the leading web 2. Now, the preceding web 2 and the following web 3 are
They are brought into a butt state on the cutting and joining drum 5.

Next, when the drum outer cylinder 6 of the cutting and joining drum 5 is rotationally driven by a drive device (not shown), the tape applying drum 24 also rotates, and the adhesive tape 28 is transferred to the abutting portion, thereby completing the joining.

When the butt joining of the preceding web 2 and the following web 3 is completed, the tape applying drum 24 moves upward in the direction of arrow C in FIG. 1 and leaves the cutting/splicing drum 5. Moreover, the hollow chamber 12a in the cutting and joining drum 5
is connected to a pressurizing device (not shown) by switching a valve. Therefore, pressurized air is blown out from the ventilation hole 7, and the webs 2 and 3 are supported without contact.

At this point, the aforementioned nip roll (not shown) for stopping the feeding is released, and feeding of the succeeding web 3 begins. Further, in FIG. 1, the turret type unwinding machine 1 is moved counterclockwise by a drive device (not shown).
The web roll 2a is rotated by 180 degrees, and the positions of the leading web roll 2a and the trailing web roll 3a are swapped. At the time when the subsequent web 3 starts to be fed out, the subsequent web 3
is supported in a non-contact manner by the pressurized air ejected from the cutting/joining drum 5, so that problems due to scratches and static electricity do not occur on the following web 3.

Although one embodiment based on the present invention has been described above, the present invention is not limited to this embodiment. For example, this example describes a one-sided bonding in which adhesive tape is attached to one side of the web.
As shown by the broken line in FIG. 4, the second tape application drum 34 is installed, and the second tape application drum 34
Double-sided bonding is also possible if the adhesive tape 28' is suctioned and held on the periphery of the adhesive tape 28'. Here, the position at which the adhesive tape 28' is held is determined by the circumferential length from the cutting point S to the second nip point N', and from the point T' that divides the width of the adhesive tape 28' into approximately two parts.
It is sufficient to select a position where the circumferential length to the nip point N' is equal to the circumferential length of the nip point N'. As a result, one side is joined at the nip point N, and the other side is joined at the nip point N'.

Further, in the embodiment described above, negative pressure is used to hold the adhesive tape on the tape applying drum 24, but static electricity may be used to hold the adhesive tape by electrostatic force. Further, an electric motor may be used in place of the fluid pressure cylinder for sliding the turret type unwinding machine 1 and the cutting/splicing drum 5 in the widthwise direction of the web.

Furthermore, a second cutting device 20 and a nip roll 22
Although it is shown that the cutting unit and the cutting unit move together, they may be provided separately instead of being incorporated into the cutting unit 19.

As explained above, according to the present invention, the following effects can be obtained.

First, the cutting mechanism uses a method in which the lower cutting blade and the upper cutting blade are engaged and the upper cutting blade traverses in the width direction of the web, making it possible to cut reliably regardless of the type and thickness of the web. .

Secondly, the cutting and splicing drum holds the trailing web before and after cutting by the first cutting device in such a way that the trailing web has some slack, so it is possible to increase the angle of embrace of the trailing web and reduce its tension. It can be made almost zero, and therefore the leading edge of the trailing web can be held securely.

Thirdly, by making the cutting/splicing drum itself movable in the widthwise direction of the web, the positions of the preceding web and the following web can be controlled independently. As a result, there is no deviation in the position of the side ends before and after the joint of the web.

Fourthly, in the present invention, since the feeding of the preceding web is temporarily stopped during the web joining operation, there is no need to suddenly accelerate or decelerate the cutting/splicing drum that holds the succeeding web. Therefore, there is no need for a large electric motor or a high-precision speed control device, and a web butt splicing device with a simple mechanism, low equipment cost, and high reliability can be obtained.

[Brief explanation of drawings]

Figure 1 is a side view showing one embodiment of the present invention, Figure 2 is a side view showing one embodiment of the present invention;
The figure is a conceptual diagram for explaining the behavior of the web on the cutting and splicing drum and the deviation of the side edge position of the web. FIG. 3 is an explanatory view showing the joining preparation operation for the subsequent web, in which (-) indicates a negative pressure state in the hollow chamber, and (+) indicates a pressurized state in the hollow chamber.
FIG. 4 is an enlarged view of the main part during cutting of the preceding web. DESCRIPTION OF SYMBOLS 1... Turret type unwinder, 2... Leading web, 2a... Leading web roll, 3... Trailing web, 3a... Trailing web roll, 4, 16... Sliding guide rail, 1b, 15a... Sliding bearing, 5... Cutting and joining drum, 6... Drum outer cylinder, 7, 11, 25, 26... Ventilation hole, 8... Lower cutting blade, 9... Groove, 10... Drum inner cylinder, 12
a, 12b, 13a, 13b, 27a-27b...
... Hollow chamber, 14 ... Partition wall, 15 ... Support frame, 17 ... First cutting device, 18, 21 ... Cutting upper blade, 19 ... Cutting unit, 20 ... Second cutting device, 22 ...Nipple roll, 23,29
... Frame, 24 ... Tape pasting drum, 28
... Single-sided adhesive tape, 30 ... Guide roll, 3
1, 32... Web position detector.

Claims (1)

[Claims] 1. A cutting/splicing drum having a lower cutting blade disposed in the widthwise direction of the web and capable of rotating and moving in the widthwise direction of the web while sucking and holding the web on a cylindrical surface; a first cutting device that cuts the leading end of the subsequent web that is sucked into the cutting and splicing drum with an upper cutting blade that moves along the cutting drum;
a nip roll that cooperates with the cutting and splicing drum to nip the leading web that is overlapped with the cut end portion of the trailing web after cutting and separation; and a nipping roll that nip the leading web nipped by the nipping roll along the lower cutting blade. The second part cuts with the moving upper cutting blade.
and a tape applying drum that cooperates with the cutting and splicing drum to nip the butted web and apply an adhesive tape to the abutted portion of the web that passes through the nip point, the first When cutting the leading end of the trailing web with the cutting device, the cutting and splicing drum sucks and holds the trailing web with slack on the feeding side of the trailing web. Device.