JPH04244397A - Structural paper cutting slitter - Google Patents

Abstract

PURPOSE:To provide a neat cut end by preventing a broken flaw from being generated in the vicinity of the cut end in the case of cutting structural paper such as in large thickness by upper and lower edge tools. CONSTITUTION:In the case of a slitter for cutting a running structural paper 9, the slitter is constituted of the first disk-shaped edge tool 7 normally rotated at a running speed or more of the structural paper 9 further to partly cut the structural paper 9 and the second disk-shaped edge tool 8 which is placed with the center of rotation in an opposite side to the first disk-shaped edge tool 7, interposing the structural paper 9, further positioned in the downstream and normally rotated at the running speed or more of the structural paper.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slitter for cutting structural paper, which is installed in a line for manufacturing structural paper such as corrugated cardboard and cardboard, and is used to slit conveyed strips of structured paper.

0002

2. Description of the Related Art FIG. 4 is a partial perspective view of a conventional slitter for cutting structural paper such as cardboard. In the figure, upper rotation axis 1
and the lower rotating shaft 2 are each rotatably supported by a frame (not shown) at both ends thereof. Further, a disc-shaped upper knife 3 is fitted on the upper rotating shaft 1, and a disc-shaped lower knife 4 is fitted on the lower rotating shaft 2.

By the way, with the rotation of the vertical rotation shafts 1 and 2,
The upper and lower knives 3 and 4 rotate oppositely while being engaged with each other. A structural paper 9 such as a strip of corrugated cardboard, which is a material to be cut, is cut with the upper and lower knives 3 and 4.
The knife 3 is fed to the engaging part of the knife 3 at the engaging part as shown in FIG.
, 4 is rotated.

0004

[Problems to be Solved by the Invention] The conventional cardboard,
Slitters for cutting structural paper such as cardboard have the following problems. That is, as shown in a schematic cutting diagram in FIG. 4, the structural paper 9, such as cardboard or cardboard, which is fed to the engaging portions of the upper and lower knives 3, 4 in a direction perpendicular to the plane of the paper, is compressed and separated during the cutting process. At this time, an excessive tensile stress is generated near the cut end of the structural paper 9, and when the breaking limit of the paper is exceeded, a tear 10 as shown in the figure occurs. This phenomenon can be easily inferred from the fact that when cutting cardboard with scissors in daily life, the cut portion is crushed and torn, resulting in no clean edges.

The present invention has been proposed to solve the above-mentioned conventional problems.

[0006]

[Means for Solving the Problems] Therefore, the present invention provides a slitter for cutting a traveling structured paper, in which a first disc rotates in a forward direction at a speed higher than the running speed of the structured paper and cuts a part of the structured paper. a second disk-shaped cutter, the center of rotation of which is located on the opposite side and downstream side of the first disk-shaped cutter with the structural paper sandwiched therebetween, and rotates sequentially at a speed equal to or higher than the running speed of the structure paper; It is constructed as a means to solve problems.

[0007]

[Operation] In the first cutting method of the present invention, in order to make a cut in advance of the running structured paper, the first disc-shaped blade rotates in the running direction of the running structured paper, so that there is no uncut area in advance. Slit processing is performed. Next, at the abutting portion of the double-edged blade between the blade and a second disc-shaped blade which rotates forward with its cutting edge abutted against each other, the uncut portion is separated by a so-called scissors action to complete the cutting.

In the case of the second cutting method of the present invention, the uncut portion is cut into slits from the back side using a second disc-shaped knife. In other words, in the first disc-shaped cutter, slit processing is performed by the cutting action of a single blade, and the abutting portion of the first and second disc-shaped cutters or the second disc-shaped cutter placed separately In this case, the cutting mode is a shear cutting action or a slit cutting action of the uncut portion, respectively. That is, since the former is a cutting action, the material to be cut is not crushed unlike the conventional method, and slitting can be performed up to the uncut portion. Therefore, in the past, excessive tensile stress was generated near the cut ends of the upper and lower surfaces of the structured paper, causing tears, but the present invention eliminates this problem.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described with reference to the drawings. FIG. 1 is a partially sectional side view of a slitter according to a first embodiment of the present invention. In the figure, 5 and 6 are rotatable upper and lower rotation axes, respectively, and 7 and 8 are upper and lower rotation axes 5.
and 6, respectively, are first and second disk-shaped cutters fitted therein. Reference numeral 9 denotes a thick structural paper such as cardboard that is fed parallel to the rotational direction of the blades 7 and 8. Here, the first disk-shaped cutter 7 is disposed in front of the second disk-shaped cutter 8 so as to make a cut before the structural paper 9 that is the material to be cut, and the first disk-shaped cutter 7 is placed in front of the second disk-shaped cutter 8 at a speed higher than the running speed V of the structured paper 9. It rotates forward at a circumferential speed of, for example, V to 10V. Here, the lowest part of the first disk-shaped cutter 7 is a structural paper 9
It is arranged so as not to be below the lower surface of the structure paper 9, that is, at a cut position where an uncut portion can be left on the structural paper 9.

[0010] Further, the cutting edge portion is in contact with the first disc-shaped blade 7, and a second disc-shaped blade 8 is disposed at a rear position thereof. In other words, the axis lines of the upper rotating shaft 5 and the lower rotating shaft 6 are configured to be inclined toward the trailing side with respect to the structural paper 9. Then, as described above, the structural paper left uncut by the first disc-shaped cutter 7 is introduced into the abutting portion of the first and second disc-shaped cutters 7 and 8, and is separated by the action of scissors. Also, the second disk-shaped cutter 8
also rotates forward in the running direction of the structural paper, engages with the first disk-shaped cutter 7 and rotates oppositely, although the circumferential speed of the second disk-shaped cutter 8 is higher than the running speed V of the structure paper 9. , does not necessarily have to be the same circumferential speed as the first disc-shaped cutter 7, for example, 1 to 1.3
It is preferable that the circumferential speed is slightly higher than the running speed of the structured paper of about V.

Next, FIG. 2 shows a second embodiment of the present invention. The difference between this second embodiment and the first embodiment is that the second disc-shaped cutter 8' is not brought into contact with the rear side of the first disc-shaped cutter 7, and instead the second disc-shaped cutter 8' is placed on the back side of the structural paper 9. This is because it is placed on the side. Second
The disk-shaped cutter 8' is disposed to protrude beyond the amount of uncut portion of the structural paper 9 by the first disk-shaped cutter 7, and has a circumferential speed similar to that of the cutter 7, such as normal rotation at V to 10V. Preferably.

Next, the operation of the embodiment constructed as described above will be explained. The first disk-shaped cutter 7 which rotates in the running direction of the structural paper 9 performs slitting with an uncut portion in advance. Next, in the case of the first embodiment, the uncut portion is cut off by a so-called scissors action at the contact portion between the double-edged tool and the second disc-shaped cutter 8 which rotates forward with its cutting edge abutted. complete the cut.

In the case of the second embodiment, the uncut portion is cut into slits from the back side. In other words, in the first disc-shaped cutter 7, the slit processing is performed by the cutting action of a single blade, and in the case of the first embodiment, the uncut portion is left behind by the first and second disc-shaped cutters 7, 8. However, in the case of the second embodiment, the cutting mode is a slit cutting action by the second disk-shaped blade 8'. That is, in the former case, since it is a cutting action, the material to be cut is not crushed unlike the conventional method, and slitting can be performed up to the uncut portion. Therefore, in the past, excessive tensile stress was generated near the cut ends of the upper and lower surfaces of the structured paper, causing tears, but the present invention eliminates this problem.

The reason why the uncut portion is provided is that when cutting the entire thickness with a single blade without leaving any uncut parts, burrs and burrs are created at the cut end of the lower surface due to the friction effect with the material to be cut as the blade rotates. Alternatively, burrs may occur, and even if the cut on the upper surface is beautiful, the cut on the lower surface becomes ugly. Therefore, this problem can be solved by providing an uncut portion and performing shear cutting or slit cutting at a later stage. In other words, it eliminates the drawbacks of each cutting action with one blade and two blades,
A cutting style that takes advantage of its features has been realized, and it is simply constructed with one set of structures that are a single process.

[0015]

Effects of the Invention As explained in detail above, the present invention includes a first disc-shaped cutter for cutting a part of the structural paper, and a second disc-shaped cutter located on the downstream side on the opposite side of the same cutter. By providing this, it is possible to solve the problem of paper edge bursting at the cutting part, which has been an important problem in cutting cardboard, and thereby a beautiful cut can be obtained and the cutting quality can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a slitter for cutting structural paper according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a slitter for cutting structured paper according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing how structural paper is cut by a conventional cutter.

FIG. 4 is a perspective view showing a state in which structural paper is cut by a conventional cutter.

[Explanation of symbols] 5 Upper rotation axis 6 Lower rotation axis 7 First disk-shaped cutter 8 Second disc-shaped cutter 9 Structural paper

Claims (1)

[Claims] 1. A slitter for cutting a traveling structured paper, comprising: a first disk-shaped blade that rotates forward at a speed higher than the running speed of the structured paper and cuts a part of the structured paper; A second disc is located on the opposite side of the first disc-shaped cutter and on the downstream side, and rotates in the forward direction at a speed higher than the running speed of the structured paper.
A slitter for cutting structural paper characterized by being composed of a disc-shaped blade.