JPH06155374A - Slitter - Google Patents

Abstract

PURPOSE:To provide a slitter, with which abrasion hardly occurs and the cut end surface of a product can be finished clearly. CONSTITUTION:A web inserted between an upper cutter 10 and a lower cutter 14 that are rotated in a correlated manner, is cut in the stream direction of the web by a slitter. The upper cutter 10 is a disc shape member, on which an edge 11 is formed on the outer periphery, while the lower cutter 14 is an annular groove 12 formed on the outer periphery of a roller 2 in the circumferential direction. As the upper cutter 10 is made of ceramic material, it is very hard, and abrasion hardly occurs. The edge can be made into a thin and sharp form, the web can be slitted only by bringing the upper cutter 10 into contact with the web, without shearing action of making the cutter into contact with the lower cutter 14. Since the cut part of the web is not folded into the groove, no fuzzing or crease occurs, and the cut end surface can be finished clearly.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a slitter. More specifically, the present invention relates to a slitter for rewinding a long web of paper, film or the like wound in a roll shape and continuously cutting the long web into a necessary width in the flow direction.

[0002]

2. Description of the Related Art A conventional slitter will be described with reference to FIGS. In FIG. 7, 51 is an upper blade, 52 is a lower blade, upper blade 51 is a disk-shaped rotary blade, and the lower 52 is one side of an annular groove 54 formed on the outer periphery of the roll 53. The blade 55 is formed. Then, while the upper blade 51 and the lower blade 52 are being rotated, the web is passed between them and slitting is performed by a shearing action.

[0003]

However, in the slitter of the conventional example, since the web is slit by the shearing action, the upper blade 51 and the lower blade 52 must be pressed against each other to ensure a certain contact pressure at all times. Since it does not occur, it has a drawback that it is easily worn. For this reason, maintenance is troublesome and operating costs are high. Also, abrasion may cause fuzz on the cut end surface of the web, or as shown in FIG.
On the back side of 51 (right side in the figure), the web W hangs deeply from the corner 56 of the groove 54, and folds and wrinkles are formed. In this case, if the final product produced is a toilet paper roll or the like, the external appearance of one end face will be poor, so
It reduces the product value.

In view of such circumstances, it is an object of the present invention to provide a slitter that is less likely to wear and has a cut end surface of a product that is finished neatly.

[0005]

The slitter of the present invention comprises:
An upper blade and a lower blade that rotate with each other, a slitter that cuts a web passed between them in the flow direction of the web, wherein the upper blade is a disk-shaped member, and the blade is on the outer periphery thereof. Is formed, and at least the blade portion is a ceramic material, the lower blade is an annular groove formed in the circumferential direction on the outer periphery of the roll, the rotation speed of the upper blade and the rotation speed of the lower blade It is characterized by different settings.

[0006]

In the present invention, since the upper blade is made of a ceramic material, it is highly advanced and is less likely to wear. Therefore, the blade can be formed into a thin and sharp shape, so that the web can be slit only by bringing the upper blade and the web into contact with each other without relying on the shearing action of bringing the blade into contact with the lower blade. In this way, the upper and lower blades do not contact each other, resulting in less wear and longer life, and the cut portion of the web does not break into the groove, so no fluffing or wrinkling occurs and the cut end face is clean. become.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. In FIG. 1, 10 is a disk-shaped upper blade, and a sharp blade 11 is formed on the outer peripheral edge thereof. The entire upper blade 11 or a portion of the blade 11 is made of a ceramic material, has a very high altitude, and has high abrasion resistance. In addition, according to this ceramic material, the thickness of the blade 11 can be made much thinner than in the drawing, and the sharpness can be remarkably improved. Reference numeral 2 denotes a roll, which has an annular groove 12 formed on the outer periphery thereof, and a portion including the annular groove 12 and shoulder portions 13 on both sides thereof serves as a lower blade 14. The width of the annular groove 12 is slightly wider than that of the upper blade 10, and it is preferable that the annular groove 12 does not come into contact with the side surface of the upper blade 11. The position of the blade 11 of the upper blade 10 is set so as to slightly enter the groove 12.

FIG. 2 shows another embodiment of the present invention,
This is one in which an elastic member 15 such as rubber is buried inside the annular groove 12. In this embodiment, the blade 11 of the upper blade 10 is replaced with the elastic member 15.
It is advisable to make light contact with the surface of.

When the web W is slit by the slitter of each of the above-mentioned embodiments, as shown in FIG. 3, the web W is wound around the outer circumference of the roll 2 for about half a circumference to give a certain tension in the width direction of the web W. , And then the web W is run in the direction of arrow d. The upper blade 10 is in the same direction (arrow b) as the rotation direction (arrow a direction) of the roll 2 on which the lower blade is formed.
It may be rotated in the direction) or in the opposite direction (direction of arrow c). When rotating in the same direction, the upper blade 10
The rotation speed is made slightly faster or slower than that of the roll 2 so as to give a speed difference.

4 to 5 show an example in which the above slitter is applied to a toilet paper winder. Reference numerals 2 and 3 are drive rolls, 4 is a riding roll, and 5 is a nip roll. The web W is wound around the winding shaft 1 while rotating the drive rolls 2 and 3, and the rolling roll R is pressed by the riding roll 4. Toilet paper roll R
Is manufactured. During this time, the web W is running in the direction of arrow d, and is slit in the longitudinal direction by the roll 2 having the lower blade and the upper blade 10.

Although the above example is an apparatus in which the slitter is incorporated in the winder, the present invention is also applicable to an apparatus in which the winder and the slitter are separately provided as shown in FIG. . In this apparatus, a slitter S including an upper blade 10 and a roll 2 is installed between drive rolls 101 and 102 for winding a paper roll R and a raw roll R0. The winder of the type shown in this figure is often used for large paper roll winders such as newspapers.

According to the slitter of each of the above embodiments, the upper blade
10 is a ceramics material, which has a very high altitude and does not cause wear so that it is sharp and has a clean cut end surface. Further, since the web W is slit without coming into contact with the groove 12, abrasion is further unlikely to occur and the life is extended. Furthermore, since the web W is cut before it goes deep into the groove 12, the shoulder
It will not be folded at 13 and wrinkled. This point is particularly remarkable in the embodiment of FIG. For this reason, the toilet paper roll manufactured by using the slitter of this embodiment has a good appearance on both end faces, and can enhance the product value.

[0013]

According to the present invention, it is possible to obtain a slitter in which abrasion is unlikely to occur and the end surface of a paper roll product is finished neatly.

[Brief description of drawings]

FIG. 1 is a front view of a slitter according to an embodiment of the present invention.

FIG. 2 is a front view of a slitter according to another embodiment of the present invention.

FIG. 3 is an explanatory diagram of a usage state of the slitter of the present invention.

FIG. 4 is a side view of the essential parts of a toilet paper winder to which the slitter of the present invention is applied.

FIG. 5 is a perspective view of a main part of a toilet paper winder to which the slitter of the present invention is applied.

FIG. 6 is a perspective view of another type of roll winder to which the slitter of the present invention is applied.

FIG. 7 is a front view of a conventional slitter.

8 is an enlarged view of a main part of the conventional slitter shown in FIG.

[Explanation of symbols]

2 rolls 10 upper blade
11 blade 12 annular groove 14 lower blade
15 Elastic member

Claims (2)

[Claims] 1. A slitter for cutting a web, which is passed between the upper blade and the lower blade, which rotate with respect to each other, in a flow direction of the web, wherein the upper blade is a disk-shaped member, A blade is formed on the outer periphery thereof, and at least the blade portion is a ceramic material, the lower blade is an annular groove formed in the circumferential direction on the outer periphery of the roll, and the rotation speed of the upper blade is reduced. A slitter characterized by being set differently from the rotation speed of the blade. 2. The slitter according to claim 1, wherein an elastic member is embedded in the annular groove of the lower blade.