JPH05162903A - Web cutting device in web take-up device - Google Patents

Abstract

PURPOSE:To provide a simplified web cutting device which can straighten the cutting line of a web regardless of the elongation and tensile characteristic of a web to be cut and reduce generation of paper dust. CONSTITUTION:A web take-up device comprises a web separating roll 10 on which a web separator 11 is formed and a main take-up drum 5 on the surface of which a groove 20 is formed, wherein the web separator 11 includes a cutter knife 13, an anvil knife 22 is provided on the side on the main take-up drum rotating direction side in the groove 20 formed the surface of the main take-up drum 5, and when the web separator 11 rushes into the groove 20 formed on the surface of the main take-up drum 5, the cutter knife 13 and the anvil knife 22 are forced to come into contact with each other to shear cutting the web 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web cutting device in a web winding device.

[0002]

2. Description of the Related Art A web winding device for winding a web into a small roll from a large roll of sheet material such as paper is used, for example, to cut a long web into a desired length. It is equipped with a web cutting device as found in Japanese Patent Publication No. 49-41543 and Japanese Patent Publication No. 1-21862. All of these web take-up devices
As shown in FIGS. 6, 7 and 8, the main take-up drum 50 has a main take-up drum 50 and a web separating roll 60 which are operatively connected to each other so as to rotate in synchronization with each other. A groove 52 is formed in the web separation roll 60, and the web separation roll 60 has a web separator 61 protruding from the surface thereof, and the groove 52 and the web separator 61 are the main winding drum 50 and the web separation roll 60. The web separator 61 is formed on the main winding drum 50 and the web separating roll 60 so that the web separator 61 rushes into the groove 52 at a selected point in the synchronous rotation of the web separator 61. There is a rigid member 62 into which the web 51 is pushed, which is surrounded by a compressible member, in particular a compressible strip 63, made of spongy rubber, polyurethane or elastic material.

In the above-mentioned winding device, when the rigid member 62 penetrates into the groove 52, the web 51 can be compressed by the member 63 so as to be in close contact with the surface of the main winding drum on both sides of the groove 52. And the web 51 plunges into the groove 52 a distance beyond the stretch and tension limits of the web and tears the web 51 in the groove 52. Then, as soon as the tip end portion 51a and the tail edge 51b of the cut web 51 are cut, the main winding drum 50 is not separated from the surface of the main winding drum 50 which has been wound around until now.
Is equipped with a vacuum device. Then, even after the separation of the web 51 occurs with a vacuum device, both the tip end portion 51a and the tail edge 51b of the web 51 are brought into contact with the surface of the main winding drum 50 in a predetermined rotation section in the vicinity of the groove 52. It is configured to be held as it is.

[0004]

However, such a conventional web cutting device has the following drawbacks. Generally, the elongation and tensile properties of the cut web are not constant depending on the type of web, so the width of the groove 52,
The depth and the dimensions of the web separator 61 in the normal direction must be adapted to the type of web to be wound on the winder. That is, when the elongation and tensile properties of the web 51 cut by the web separator 61 are large, the width and depth of the groove 52 and the dimension of the web separator 61 in the normal direction are not increased so that the web separated by the web separator 61 is large. 51 is difficult to cut. On the other hand, when the elongation and tensile properties of the web are small, the web 51 can be cut even if the width and depth of the groove 52 and the dimension of the web separator 61 in the normal direction are small. When the web 51 is pushed into the groove 52 by the rigid member 62 formed in the web separator 61, a compressible strip 63 for preventing the displacement of the web 51 and for making the pushing in the groove 52 more reliable is provided. I need. Since the web 51 is cut so as to be torn, a large amount of paper dust is generated, and the wound roll is soiled by the paper dust. Therefore, a dust collecting device for collecting the generated paper dust is required and the dust collecting device needs to be cleaned. In order to reduce the generation of the paper dust and to straighten the cutting line, the perforation position on the web 51 and the groove 52 on the surface of the main winding drum 50 are aligned and cut so as to be at the same position. However, it is difficult to align the position of perforations in a wide web because its elongation is not uniform over the entire width of the web. Then, in order to make the position of the perforation and the groove 52 on the surface of the main winding drum 50 at the same position, the pitch of the perforations must be set to a fraction of the outer peripheral length of the main winding drum 50. Since it does not happen, adjustment for that is necessary. The elongation and tensile properties of the cut web 51 differ subtly across the width of the web 51, so
When the web 51 is cut so as to tear beyond the elongation and tension limits of the web, the cutting line does not become a straight line. That is, even when the position of the perforation of the web 51 overlaps the groove 52, as shown in FIG.
51b is cut and the cutting line is not straight. During acceleration / deceleration, the friction between the main winding drum 50 and the web 51 is slightly different, and the groove 52 on the surface of the main winding drum 50 and the position of the perforation are slightly deviated from each other, so that the cutting line is not a straight line. That is, as shown in FIG. 10, the tail edge 51b of the web is cut and the cutting line is not a straight line. Two webs when cutting a two-ply web 51
Since the elongation of 51 is subtly different, when the web 51 is cut so as to be torn beyond the limit of elongation and tension of the web 51, the cutting line shifts between the two webs 51.

In view of the above situation, the present invention can make the cutting line of the web straight regardless of the elongation and tensile properties of the cut web, and can reduce the generation of paper dust. An object is to provide a cutting device.

[0006]

SUMMARY OF THE INVENTION A web cutting device of the present invention includes a main take-up drum and a web separating roll operatively connected to each other so as to rotate in synchronization with each other, and a surface of the main take-up drum. A groove is formed in the web separation roll, the web separation roll having a web separator protruding from the surface thereof, the groove and the web separator separating the web at a selected point in the synchronous rotation of the main take-up drum and the web separation roll. The separator is formed on the main take-up drum and the web separating roll so as to rush into the groove, and after the separation of the web occurs, the tip end of the separated web is wound in the vicinity of the groove. Means for holding the surface of the take-up drum in contact and means for holding the tail of the separated web in contact with the surface of the main take-up drum in the vicinity of the groove, A web winding device configured with suction holes provided on the surface of the winding drum, wherein the web separator has a cutter knife, and is provided in a groove formed on the surface of the main winding drum. An anvil knife is provided on the side surface of the main winding drum in the rotation direction, and when the web separator rushes into the groove formed on the surface of the main winding drum, the cutter knife and the anvil knife are brought into contact with each other. Share cutting the web.

[0007]

In the web cutting apparatus of the present invention, the cutter is formed in the web separator, and the anvil knife is formed in the groove on the surface of the main winding drum on the side surface in the direction of rotation of the main winding drum. As the web separating roll approaches the main winding drum and the cutter knife and the anvil knife come into contact with each other, the web is shear cut and the web is cut into two pieces. In the case of shear cutting, the cutting resistance is very small, so the width and depth of the groove of the main take-up drum and the normal dimension of the web separator must be adapted to the type of web to be taken up by the winder. Since there is no need to form a compressible member in the web separator to prevent slippage of the web, and because less paper dust is generated, there is no need for a dust collector to remove paper dust. Can be simplified.

Further, since the web is shear-cut, it is not necessary to align the position of the perforations on the web with the grooves on the surface of the main winding drum, and the pitch of the perforations can be freely selected. It is possible to improve work efficiency. Further, while the web is held on the surface of the main winding drum by vacuum, the web is shear-cut by the contact between the cutter knife and the anvil knife, so that the cutting line of the web becomes a straight line. Also, when cutting a two-ply web, the two webs tend to stick because the two webs are cut by the shearing force caused by the contact between the cutter knife and the anvil knife. Since it does not shift, it is convenient for fixing the tail edge of the web after winding or for processing when the front end of the web is sent to the fixing device.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the web winding device shown in FIG. 1, the web 1 after passing between the perforation roll 2 and the anvil roll 3 is wound around the main winding drum 5 via the feed roll 4 and passed through the main winding drum 5. The leading end of 1 is wound around the winding core 7 which has been fed into the winding space 7 after passing between the main winding drum 5 and the sub winding drum 6 and is made up of the winding drums 5 and 6 and the nip roll 9. Space 7
In the above, the tape is wound up to a log having a desired thickness.

Incidentally, the perforation roll 2 and the anvil roll 3 arranged in front of the feed roll 4.
The perforation-forming device consisting of can make the web 1 form perforations at even intervals when the anvil roll 3 is brought close to the illustrated working position.
When the anvil roll 3 is separated from the perforation roll 2 to the inoperative position (not shown), the perforation is not formed on the web 1. Then, when the log is wound for a predetermined length and wound to a desired thickness, the web 1 is separated by a web separator 11 of a web separating roll 10 provided opposite to the main winding drum 5 ( Is cut).

As shown in FIG. 2 (A), a web separator 11 having a cutter knife 13 along the normal direction of the roll 10 is attached to the surface of the web separating roll 10 and is mainly wound. A groove 20 is formed on the surface of the drum 5 along the longitudinal direction of the drum 5, and an anvil knife 22 is attached to one side surface of the groove 20. The shape of the cutter knife 13 is, as shown in FIG.
b is inclined with respect to the axis of the main winding drum 5 and curved into a predetermined shape, and the cutting edge 13b and the main winding drum 5 are
A guide 13a protruding in a direction perpendicular to the axis of the main winding drum 5 is formed at the end of the cutting edge 13b where the distance from the surface 5a of the main winding drum 5 is minimum.

The shape of the cutting edge 13b of the cutter knife 13 is inclined with respect to the axis of the main winding drum 5 and curved to a predetermined shape for the following reason. When the web 1 is cut, the cutter knife 13 and the anvil knife 22 are brought into contact with the web with a constant contact pressure. However, since the deflection of the roll and the processing error are not zero, the contact pressure is not constant, so the cutter knife 13 The machining error is absorbed by the bending of the cutting edge 13b. Further, if the blade edge 13b of the cutter knife 13 is made straight and the web 1 is to be cut all over the width at a time, a large force is required, and a large roll or other components are required, which is not economical. Furthermore, if the cutting edge 13b of the cutter knife 13 is made straight, it becomes difficult to cut the web 1 in accordance with the movement of the anvil knife 22.

At the end of the cutting edge 13b where the distance between the cutting edge 13b of the cutter knife 13 and the surface 5a of the main winding drum 5 is minimum, a guide 13a protruding in a direction perpendicular to the axis of the main winding drum 5 is provided. It is formed so that when the cutter knife 13 and the anvil knife 22 first engage, the cutter knife 13 will fit smoothly into the groove 20 in which the anvil knife 22 was formed.

The cutter knife 13 is a web separating roll.
Web separator stand 14 and knife holder formed on the surface of 10
It is sandwiched by 12 and is detachably attached to the web separator table 14 by bolts 15.

The anvil knife 22 is formed so as to extend linearly in the longitudinal direction of the main winding drum 5.
The anvil knife 22 has a cutting edge 22a inclined rearward in the rotation direction of the main winding drum 5 on one side surface in the groove 20, that is, a surface side of the side surface 12a on the rotation direction side of the main winding drum 5 and having a cutting edge. The knife retainer 23 and the bolt so that the surface 22b is substantially flush with the surface of the main winding drum 5.
It is detachably attached to the main winding drum 5 by 24. And the anvil knife of the knife holder 23
In order to hold the tail edge 1b of the separated web 1 on the surface of the main take-up drum 5 in the vicinity of the groove 20 even after the separation of the web 1 by the web separator 11 has occurred on the surface of the side 23a that presses the 22. The suction holes 21 are formed. The anvil knife 22 may be formed on the other side surface in the groove 20, that is, on the side surface opposite to the main winding drum 5 in the rotation direction. Even in this case, as long as the web 1 can be shear cut in cooperation with the cutter knife 13, it is suitable as an embodiment of the present invention.

A groove is formed on the surface 5a of the main winding drum 5.
Even after the web separator 11 separates (cuts) the web 1 behind the main winding drum 5 in the rotational direction of the main winding drum 5, the front end portion 1a of the web is in the vicinity of the groove 20 and the surface of the main winding drum 5 is close to the groove 20. A large number of suction holes 16 for holding the same are formed in parallel in the longitudinal direction of the main winding drum 5 with their openings facing the front surface side of the main winding drum 5. A suction groove 18 for connecting the suction holes 16 to each other is formed in the suction portion of the suction hole 16 in the longitudinal direction of the main winding drum 5.
The suction holes 16 and 21 pass through ducts inside the main winding drum 5 and communicate with vacuum sources 25 and 26 (see FIG. 1).

Next, a method of shear-cutting the web 1 will be described with reference to FIGS. First, when the web separating roll 10 that is rotated in synchronization with the rotation of the main winding drum 5 is displaced in the direction approaching the main winding drum 5 in the positional relationship shown in FIG. 1 (direction of FIG. 1a), Cutting edge of the cutter knife 13 formed on the web separator 11
13b approaches the groove 20 and reaches the opening of the groove 20 as shown in FIG. At this time, the cutting edge of the anvil knife 22
22a and the cutting edge 13b of the cutter knife 13 are in contact with each other indirectly via the web 1.

Next, when the main winding drum 5 and the web separating roll 10 rotate synchronously from the above state and the web separating roll 10 further approaches the main winding drum 5, as shown in FIG. Cutting edge 22a of anvil knife 22
The web 1 is cut by the shearing force due to the contact between the blade edge 13b of the cutter knife 13 and the tip portion 1a and the tail edge 1b. The main winding drum 5 and the web separating roll 10 are operatively connected to each other so that the contact pressure when the cutting edge 22a of the anvil knife 22 and the cutting edge 13b of the cutter knife 13 contact each other becomes constant. ing.

After the web 1 is cut, as shown in FIG. 5, the main take-up drum 5 and the web separating roll 10 rotate in synchronization with each other, and the web separating roll 10 moves away from the main take-up drum 5. The web 1 is displaced (in the direction of FIG. 1b).
The cutting work of is completed. At this time, the tip 1a of the web
Is sucked into the suction hole 16, and the tail edge 1b of the web is sucked into the suction hole 21. Then, this suction is continued until the web is cut by the main winding drum 5 and the web separating roll 10 and then the winding of the tail edge 1b of the web is completed and the leading end 1a of the web is wound around the winding core 8. It is like this.

As described above, since the web cutting device cuts the web 1 by utilizing the shearing force due to the contact between the anvil knife 22 and the cutter knife 13, it can be used regardless of the type of the web 1. Further, since the amount of paper dust generated is small, a dust collector for removing the paper dust is not required, so that the structure of the entire device can be simplified, and the perforation pitch of the web 1 can be freely selected, so that the work efficiency can be improved. It is possible to improve.

When the web cutting apparatus according to this embodiment is used, the web 1 is held by the vacuum on the surface of the main winding drum 5, and the web 1 is shared by the contact between the cutter knife 13 and the anvil knife 22. Since cutting is performed, the cutting line of the web 1 becomes a straight line as shown in FIG. Therefore, it is convenient for fixing the tail edge 1b of the web after winding or for processing when the front end portion 1a of the web is sent to the fixing device.

[0022]

Since the web is cut by shear cutting by contact between the cutter knife and the anvil knife, less paper dust is generated and the pitch of the perforation of the web can be freely selected, so that the structure is simplified. It is possible to improve work efficiency. Since the web is shear-cut by the shearing force due to the contact between the cutter knife and the anvil knife, the cutting line of the web becomes a straight line. Therefore, it is convenient for the tail edge of the web to be fixed, and the appearance of the web when it has been wound into a log (for example, the appearance of a toilet paper product).
However, it can be rolled up to the end cleanly and the product value is improved. Further, it is convenient for processing when the front end of the web is sent to the fixing device, and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a side view schematically showing a web winding device.

FIG. 2A is a cross-sectional view showing main parts of a web separating device and a web holding device, and FIG. 2B is a plan view of a cutter knife.

FIG. 3 is a state explanatory view when a web separating roll approaches a main winding drum.

FIG. 4 is an explanatory view of a state in which the web is shear-cut by a cutter knife and an anvil knife.

FIG. 5 is an explanatory view of a state in which the web separating roll is separated from the main winding drum after the web is cut.

FIG. 6 is an explanatory view of a conventional web cutting device.

FIG. 7 is a detailed view of a conventional web separating roll.

FIG. 8 is an explanatory view of a state when a web is cut by a conventional web cutting device.

FIG. 9 is a cutting state diagram of a tail edge of a web cut by a conventional web cutting device.

FIG. 10 is a cutting state diagram of a tail edge of a web cut by a conventional web cutting device.

FIG. 11 is a cutting state diagram of a tail edge of a web cut by the web cutting device according to the present invention.

[Explanation of symbols]

1 web 1a tip of web 1b tail of web 5 main winding drum 10 web separation roll 11 web separator 13 cutter knife 20 groove 22 anvil knife

Claims (1)

[Claims] 1. A main take-up drum and a web separating roll, which are operatively connected to each other so as to rotate synchronously, wherein a groove is formed on the surface of the main take-up drum, and the web separating roll is Having a web separator protruding from the surface,
The groove and the web separator are arranged on the main take-up drum and the web separation roll so that the web separator rushes into the groove at a selected point in the synchronous rotation of the main take-up drum and the web separation roll. A means for holding the tip of the separated web in contact with the surface of the main take-up drum in the vicinity of the groove after the separation of the formed web and the tail edge of the separated web Is a web winding device in which the means for holding the surface of the main winding drum in the vicinity of the groove is held by a suction hole provided on the surface of the main winding drum. The web separator has a cutter knife,
In the groove formed on the surface of the main winding drum, the main winding drum is provided with an anvil knife on the side surface in the rotating direction.
Web cutting in a web winding device, characterized in that when the web separator rushes into a groove formed on the surface of the main winding drum, the cutter knife and the anvil knife are brought into contact with each other to shear cut the web. apparatus.