JPH0453785B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a continuous web splicing device, and more particularly, to a continuous web splicing device that can reliably perform guiding paper by replacing web rolls. It is related to the device.

[Conventional technology]

As prior art related to continuous automatic web splicing methods and devices, those described in Japanese Patent Publication No. 55-25578, Japanese Patent Publication No. 56-20255, Japanese Utility Model Application Publication No. 59-40248, etc. are known.

[Problem that the invention seeks to solve]

However, although the above continuous automatic splicing technology is suitable for webs with normal tensile strength (e.g., cardboard liner, gauze, etc.), it is suitable for webs with low tensile strength and soft (e.g., disposable diaper liners, etc.). It is unsuitable for water-conducting paper, etc.).

In other words, during automatic splicing, it usually takes a certain amount of time to start up the new web roll, and as a result, a sudden tensile force is applied to the new web roll after automatic splicing, resulting in low tensile strength. This is because the web cannot withstand such tensile force. Therefore, for webs with low tensile strength, after splicing the webs at a low running speed, the running speed is gradually increased again.

Therefore, in the above-mentioned conventional technology, when joining webs with low tensile strength, the webs are intermittently fed into a post-processing machine.
As a result, loss of working time, defects in processed products due to changes in operating conditions, etc. occurred, and damage in the processing process sometimes occurred.

[Means for solving problems]

The present invention includes a web auxiliary feeding device that feeds out a web from a new web roll, and a web splicing device that splices a leading end of a web from a new web roll to a splicing portion such as a terminal end of a web from an old web roll. A continuous web splicing device comprising: a web feeding device having a suction belt on a path from which the web fed out by the auxiliary web feeding device reaches the web splicing device; A web roll exchanging device is provided for exchanging the positions of a new web roll on the upstream side and an old web roll on the downstream side in a substantially elliptical path, and the web roll exchanging device replaces the new web roll with the old web roll. The web reeling device is equipped with a drive mechanism that rotates the new web roll in a direction in which it can be pressed against the suction belt of the web reeling device from above, when changing the new web roll to the suction belt of the web reeling device. The swing arm supports the suction belt against which the new web roll is pressed from below, and separates the suction belt from the old web roll from the state in which the web roll changing device is rotating the suction belt. The present invention provides a web splicing device characterized in that the suction belt is biased upward so as to come into contact with the outer periphery of the new web roll until it is spliced.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the continuous web splicing apparatus of the present invention shown in the drawings will be described below.

FIG. 1 shows a perspective view of an embodiment of the present invention, in which 1 is a web auxiliary feeding device for feeding out a web 2' from a new web roll 2;
is the web 2' from the new web roll 2 at the joint part such as the end of the web 4' from the old web roll 4.
In the continuous web splicing device of the present invention, a path (hereinafter referred to as , web path) 5, there is a web feeding device 6 having a suction belt 61, and the positions of the new web roll 2 on the upstream side and the old web roll 4 on the downstream side with respect to the flow of the web. A web roll exchanging device 8 is provided for exchanging web rolls along a substantially elliptical path (hereinafter referred to as an exchanging path) 7.

To explain the embodiment in more detail, the web auxiliary feeding device 1 includes an end sensor 11 (see FIG. 2) that detects the end (tip end) of the new web roll 2, and an end sensor 11 (see FIG. 2) that detects the end (tip end) of the new web roll 2, An auxiliary drive roll 12 that contacts and rotates, a heat fan 13 that peels off the heat-sensitive tape 21 (see FIG. 10) at the end of the new web roll 2, and a suction cup 14 that adsorbs the peeled end of the new web roll 2. It is comprised of a web draw-out cylinder 15 located at the upper part and which pulls out the web 2' from the new web roll 2 downward, and a guide belt 16 which guides the drawn-out web 2' to the web path 5. As shown in FIG. 10, the new web roll 2 from which the web 2' is drawn out by the web auxiliary feeding device 1 has its ends adhered with heat-sensitive tape 21 before use. As shown in FIG. 11, the adhesive of the heat-sensitive tape 21 is melted by the hot air from the heat fan 13, and the end portion is peeled off by suction by the suction cup 14, as shown in FIG. be. The heat-sensitive tape 21 has an adhesive encapsulated in microcapsules on one side of a tape base material such as aluminum tape, and when heated, the microcapsules break and exhibit an adhesive effect, and the adhesive remains sticky for several hours after being heated. It is possible to use a material that has properties and exhibits a reliable joining effect and paper guiding effect. The auxiliary driving roll 12 in the auxiliary web feeding device 1 operates from the time of auxiliary feeding of the web 2' from the new web roll 2 to the time of joining the web 2' with the web 4' from the old web roll 4. The cylinder 17 presses and contacts the outer circumference of the new web roll 2, and its rotational speed changes into two stages, with the first stage being a low speed for detecting the end of the new web roll 2, etc. , when joining, the second stage high speed is set.

Further, the web splicing device 3 is mainly composed of a nip roll 31. The nip roll 31 is disposed at a position facing a guide roll 62 (described later) at the end of the suction belt 61, and is normally held in place by a spring 32.
2, but when joining web 2' and web 4', the nip roll cylinder 3
3 to move forward toward the guide roll 62. In addition, the web splicing device 3 includes:
Guide rolls 34 and 3 are placed below the nip roll 31.
5 and an edge position control device 36 that moves from the solid line position to the imaginary line position.

Further, the web feeding device 6 is disposed below the web path 5. The suction belt 61 is formed of an end level belt with a large number of holes, and works together with the nip roll 31 to remove the web from the upper surface of a suction box 63 connected to a suction blower (not shown). After running along the web path 5 as shown by the arrow up to the guide roll 62 where the splicing is performed, the suction belt 61 passes through the driving roll 64 and the dancer roll 65 and then runs along the web path 5 again. There is. The suction box 63 uses its suction force to attract and guide the web 2' on the web path 5 and hold it on the suction belt 61, and is fixed to a swing arm 66. This swinging arm 66 has a fulcrum roll part 67 at one end on the lower side of the new web roll 2 and a touch roll 68 at the other end on the lower side of the old web roll 4, and rotates the fulcrum roll part 67. By freely supporting the shaft and applying a constant force to the approximately middle portion thereof from below with a bellows lifter 69, the web roll changing device 8 can rotate the new web roll 2 or unwind it as described later. The suction belt 61 is brought into contact with the outer periphery of the old web roll 4 (or the new web roll 2 after the replacement is completed) in the position, and the circumferential speed of these web rolls 2 or 4 is adjusted to the speed at which the web is fed out by the suction belt 61. It is designed to synchronize with the A potentiometer is incorporated in the fulcrum roll portion 67 of the swinging arm 66, and detects the outer diameter of the old web roll 4 at the unwinding position to start replenishing the new web roll 2. be. or,
The drive rail 64 of the web feeding device 6 is
The suction belt 61 is driven so as to synchronize with the speed of the main machine (post-processing machine, not shown) that pulls out the spliced web, and the dancer roll 65 It has a function of preventing the suction belt 61 from loosening when the swing arm 66 swings around the fulcrum roll portion 67 as described above. In addition, the web auxiliary feeding device 1 is located near the fulcrum roll portion 67.
An extrusion air cylinder (not shown) is provided for introducing the end of the web 2' of the new web roll 2 fed out above the suction belt 61. In addition, the fulcrum roll portion 6 of the suction box 63
Above the end on the side 7, the introduced web 2'
An end detection sensor 9 (see Fig. 4) detects the end of the air and starts suction by the suction box 63.
is provided.

Further, the web roll changing device 8 is disposed above the web path 5. In the case of the embodiment, the replacement path 7 is the frame 81
The roll shaft movement guide 82 is limited by the roll shaft movement guide 82 provided in the
Two roll shafts 83, 84 facing each other along
It is designed to guide you. Roll shaft 8
3 and 84 are driven as shown by the arrows by a drive mechanism (not shown) on the back side of the frame 81. In the case of FIG.
supports the new web roll 2 and positions the new web roll 2 at the replenishment position, and the other roll shaft 84 supports the old web roll 4 and positions the old web roll 4 at the unwinding position. Furthermore, the replacement path 7 is formed in a substantially elliptical shape downward to the right, and when the new web roll 2 rotates from the illustrated replenishment position to the unwinding position, the outer circumference of the new web roll 2 is It is designed so that it can be pressed against the suction belt 61 of the web feeding device 6.

Next, an embodiment of a continuous web splicing method carried out using the continuous web splicing apparatus of the present invention having the above configuration will be described with reference to the drawings.

FIG. 2 shows a side view of the above apparatus at the start of the web auxiliary feeding process. Prior to this web auxiliary process, the web 4' is fed out by the suction belt 61 from the old web roll 4 at the feeding position. Also, a new web roll 2 is set at the replenishment position with its ends adhered with heat-sensitive tape 21, as shown in FIG.
The web auxiliary process starts when the potentiometer of the fulcrum roll portion 67 of the swing arm 66 detects that the old web roll 4 has reached the final diameter set for starting replenishment, as described above. That is, first, based on a command from the potentiometer, the auxiliary drive roll 12 is pressed by the cylinder 17, contacts the outer circumference of the new web roll 2, and rotates at a low speed. During this low-speed rotation, the end of the new web roll 2 is detected by the end sensor 11, and the new web roll 2 is bonded with a heat-sensitive tape 21 as shown in FIG.
The auxiliary drive roll 12 stops when the end thereof faces the heat fan 13. Auxiliary drive roll 1
2 stops, the heat fan 13 operates for a certain period of time, and the tip of the web 2' of the new web roll 2 is
The new web roll 2 is peeled off with the thermal tape 21 still attached. Next, heat fan 13
After the operation is completed, the tip of the new web roll 2 is sucked by the suction cup 14, the auxiliary drive roll 12 rotates at a low speed again, and the web drawing cylinder 15 descends at a low speed, so that the new web roll is removed as shown in FIG. The second web 2' is pulled out (unwound) at a low speed. The web 2' that has been pulled out is further pulled out at a low speed and reaches above the suction belt 61 by the guide belt 16.

When the leading end of the web 2' of the new web roll 2 reaches above the suction belt 61, the web feeding process is also started for the web 2' of the new web roll 2, as shown in FIG. That is, when the web 2' of the new web roll 2 reaches above the end of the suction box 63 on the fulcrum roll part 67 side, the end detection sensor 9 detects this and moves the web 2' to the suction box 63.
suction starts, and the leading end of the web 2' is attracted to the suction belt 61 as shown in FIG. At this time, the auxiliary drive roll 12 is also switched to the second high-speed unwinding speed, and with the circumferential speed of the new web roll 2 and the circumferential speed of the suction belt 61 matching, the web 2' is rotated at its leading end. They are suctioned and held by the suction belt 61 sequentially from the side.
As shown in FIGS. 8 and 9, the web 2' suctioned and held by the suction belt 61 in this manner is the web 4 of the old web roll 4 which has already been fed out by contacting the suction belt 61. ' and the suction belt 61, and are guided in the direction of the nip roll 31. When the web 2' from the new web roll 2 and the web 4' from the old web roll 4, which have been combined in this way, pass through the nip roll 31,
A web splicing process is carried out by the nip roll 31, and the spliced parts such as the leading end of the web 2' from the new web roll 2 and the end of the web 4' from the old web roll 4 are adhered via heat-sensitive tape. .
Incidentally, when the auxiliary drive roll 12 switches to the second high-speed feeding speed as described above, the nip roll 31 is driven by the nip roll cylinder 33 and moves forward toward the opposing guide roll 62, as shown in FIG. are doing.

After the above-described web joining process is completed, a web roll replacement process is performed. That is, the new web roll 2 moves along the splicing path 7 and
As shown in the figure, it first descends toward the suction belt 61, and then moves along the suction belt 61 while pushing down the suction belt 61, as shown in FIG. 6, to reach the feeding position. In this way, attach the outer periphery of the new web roll 2 to the suction belt 61.
If the new web roll 2 is replaced while being in contact with the new web roll 2, the replacement can be performed while the web 2' from the new web roll 2 is being fed out.

After the replacement is completed, the nip roll 31 is opened and the auxiliary drive roll 12 is stopped. Therefore, another new web roll can be placed on the empty roll shaft 84 in its replenishment position again to perform the next splicing.

In one embodiment of the above-described continuous splicing method, the web 4' from the old web roll 4 is
and the suction belt 61 so that the web 2' from the new web roll 2 can be unwound using the web roll changing device 8. At the same time, when starting to unwind the web 2' from the new web roll 2, it can be unwound without applying tension to the web 2' by the web auxiliary unwinding device 1, and when splicing the new web 2' The old web 4' can be fed out at the same speed, and therefore it is suitable for continuous splicing of webs of disposable diaper mounts or water-conducting paper.

Although one embodiment of the apparatus of the present invention and one embodiment of the continuous web splicing method implemented using the apparatus have been described above, the present invention is not limited thereto.

〔Effect of the invention〕

As mentioned above, the present invention enables continuous automatic splicing of webs with low tensile strength while maintaining the running speed of the web at a high speed, thereby eliminating loss of working time. Not only is this possible, but it also has various advantages, such as being able to eliminate defects in processed products due to changes in operating conditions.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the continuous web splicing device of the present invention, Fig. 2 is a side view thereof at the start of the web assisted feeding process, and Fig. 3 is a side view thereof during the web assisted feeding process. FIG. 4 is a side view of the web during the web unwinding process and the web splicing process, FIG. 5 is a side view of the web roll replacement process at the start of the web roll replacement process, and FIG. 6 is a side view of the web roll replacement process at the end of the web roll replacement process. Fig. 7 is a perspective view of the main parts of the web at the time of starting the process of unwinding the web from the new web roll, Fig. 8 is a perspective view of the main parts of the web just before the start of the web splicing process, and Fig. 9 is the side view of Fig. 8. Figure, 10th
The figure is a perspective view of the web roll before the start of the web assisted feeding process, and FIG. 11 is a perspective view of the web roll at the time of starting the web assisted feeding process. 1... Web auxiliary feeding device, 2... New web roll, 2'... Web from new web roll, 3...
Web splicing device, 4...old web roll, 4'...
Web from the old web roll, 5... path (web path) from which the new web roll leads to the web splicing device;
6... Web feeding device, 61... Suction belt, 7... Substantially oval path (replacement path), 8...
Web roll changing device.

Claims (1)

[Claims] 1. A web equipped with a web auxiliary feeding device that feeds out the web from the new web roll, and a web splicing device that splices the leading end of the web from the new web roll to the splicing portion such as the end of the web from the old web roll. In the continuous splicing device, the web fed out by the web auxiliary feeding device has a web feeding device having a suction belt on the path leading to the web splicing device, and a web feeding device on the upstream side with respect to the flow of the web. A web roll exchanging device is provided for exchanging the positions of a certain new web roll and an old web roll on the downstream side along a substantially elliptical path, and the web roll exchanging device exchanges the new web roll at the position of the old web roll. The new web roll is equipped with a drive mechanism that rotates the new web roll in a direction in which it can be pressed against the suction belt of the web feed-out device from above, and the web feed-out device includes:
The swinging arm supports the suction belt against which the new web roll is pressed from below, and the swing arm supports the suction belt against which the new web roll is pressed, and the swing arm supports the suction belt against which the new web roll is pressed, and the swing arm supports the suction belt against which the new web roll is pressed, and the swing arm supports the suction belt against which the new web roll is pressed, and the swing arm supports the suction belt against which the new web roll is pressed. A web splicing device characterized in that the suction belt is biased upward so as to bring the suction belt into contact with the outer periphery of the new web roll until it is spliced with the new web roll.