JPS6361009B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for pressure forming a cut section of a carpet whose surface is formed of pile.

Carpets are generally installed in long lengths, but it is inconvenient to transport them by wheel or carry them to the installation site.
Recently, 50% of large carpets have been replaced in advance due to the disadvantage that partial replacement is not possible due to damage.
Carpet tiles, which can be cut to a certain size such as cm x 50 cm and laid in the form of tiles, have come into use.

By the way, for carpet tiles whose surface is made of pile, the straightness and parallelism of the cut edges are important, but if you do not make the abutting parts inconspicuous when laying the tiles, the joints that will appear when the tiles are laid are The abutting parts appear like this, and it is not possible to express the luxurious feel of a single piece of carpet.

Figure 1 shows the most common example of carpet cutting, in which a raw carpet A with piles 2 provided on the top surface of a base 1 is run by a conveyor, chain, or roller. The carpet tile is cut out by heating the desired cutting position with a heater or hot air, and cutting the heated portion with a disk-shaped rotary blade 3.

Although the details of the carpet A are not shown, the base 1 of the carpet A is lined with a thermoplastic layer such as coal tar, and the lower part of the loop or cut pile 2 is embedded in the coal tar layer and fixed. A structure in which a base fabric with piles 2 embedded therein is adhesively fixed onto a coal tar layer is adopted.

Further, the rotary cutter 3 has a structure in which a sharp cutting edge is provided on the outer periphery of a disk, and the disk has an appropriate thickness.

Therefore, the heated part of the base 1 is heated by the rotary knife 3.
When the carpet is cut as shown in the figure, the cut surface of the carpet is compressed on both sides by the biting thickness of the cutter 3, and becomes an inclined surface conforming to the side shape of the cutter 3 due to plastic deformation due to heating.

That is, the disc-shaped blade 3 has a cutting edge around its periphery, and in order to maintain strength, the wall gradually becomes thicker from the blade edge to the center, and both sides are inclined. The cut surface of carpet A becomes an inclined surface that widens at the bottom.

When such cut carpet tiles are laid on the floor, a gap is created where the lower part touches the adjacent tile and the upper part expands.In this gap, the density of the pile becomes coarse and the upper When viewed from above, the voids appear like joints, making it impossible to express the luxurious image of a single piece.

In addition, when cutting carpet with a rotary blade, it is efficient to cut with multiple blades at the same time, but when cutting a mechanically fed carpet with a blade placed in a fixed position, the assembly precision of the feeding device is It is difficult to achieve straight line accuracy due to errors, backlash, etc., and moreover, there is lateral relief in the carpet due to the amount of biting of the cutter, which is a major cause of bends in the cut surface.

This invention was made to solve the above-mentioned problems that occurred when cutting carpet, and it is possible to make the cut edge of the carpet straight, and at the same time, it is possible to make the cut edge of the carpet straight, and at the same time, when laying the carpet, it is possible to make the cut edge of the carpet straight. It is an object of the present invention to provide a method for forming a cut portion, which does not generate gaps, makes the abutting portion inconspicuous, and allows the entire piece to be laid out in the image of a single piece.

The structure of the present invention is such that a disc-shaped rotary blade for cutting the carpet along the moving direction is provided on a movable part of the carpet formed by providing piles on the surface of a thermoplastic base, and a disc-shaped rotary blade for cutting the carpet in the moving direction of the carpet is provided on the movable part of the carpet formed by providing piles on the surface of a thermoplastic base. A guide is located at the rear and extends long in the direction of movement, and guides the cut surface of the carpet base along the direction of movement. First, the heated part of the moved carpet is cut along the moving direction with a rotary knife, and then, after cutting, the cut surface of the carpet base is brought into sliding pressure contact with the guide surface of the guide, and the guide is guided. The cut surface of the base is guided in the direction of movement of the carpet and plastically deformed to match the inclination of the guide surface to form an inclined surface that spreads upward.

The present invention will be explained below based on the embodiments shown in FIGS. 2 to 5.

Figure 2 shows the plane of the cutting device, and the carpet A is formed to a size that can cut out a plurality of carpet tiles B. For example, the size is a square with one side of 1100 mm, and the carpet tile B
is a 500mm square, and four pieces are cut out from carpet A.

The carpet A is sent forward by a conveying device such as a chain, belt, or roller, and along the moving direction of the carpet A, a pair of first cutters 11, a second cutter 12 in front of this cutter 11, and Knife 11,1
A heating device 13 such as a heater or hot air for heating the cutting position of the carpet A is placed at a position immediately before the cutting of the carpet A, and guides 14 and 15 that guide and shape the cut surface of the carpet are placed at positions immediately after the respective blades 11 and 12. They are arranged and configured respectively.

The first cutter 11 has a disk shape similar to that shown in FIG. 1, and is placed at a distance of two carpet tiles B so as to cut both sides of the carpet A from the top and remove the edges. Although not shown in the drawings, the cutter 11 is supported at both sides of the lower part of the carpet A by receivers.

The second knife 12 is provided at a position to cut the central part of the carpet A along the moving direction, and is designed to divide the carpet A cut by the first knife 11 into two equal widths. This second cutter 12 also has the same structure as the first cutter 11.

Distance L of this second knife 12 from the first knife 11
is set to a position where the biting influence of the first blade 11 is eliminated, and specifically, this distance L is approximately half or more of the cutting width of the first blades 11 on both sides.

That is, when the first blade 11 cuts the carpet A, the carpet A is compressed in the width direction by the thickness of the blade 11, and when it passes through both first blades 11 and moves an appropriate distance, it is compressed. The width is restored, and the width after cutting is slightly wider than the interval between the blades 11.

In this way, if the second blade 12 is used to cut the compressed part before it restores its original shape, the amount of compression in the width direction of the carpet A will increase dramatically, and the escape direction of the carpet will become uniform, making it difficult for the carpet to restore its original shape. Later, the cut edges will not be straight.

Therefore, the distance L between the first cutter 11 and the second cutter 12
By selecting , the cut edge after restoration can be finished in a straight line.

Guides (rulers) 14 on both sides disposed immediately after the first cutter 11 are disposed so that their cutting surfaces slide along the moving direction of the carpet A, and are provided with presser plates 14b on their upper surfaces.

The opposing widths of this guide 14 on both sides become wider toward the front so as to correspond to the change in the cutting width of the carpet A described above.

That is, the opposing width between the rear ends at the position immediately behind the first cutter 11 is the narrowest, and gradually becomes wider so that the restoration amount of the carpet A can escape from this rear end forward, and on both sides of the second cutter 12, the opposite width is the narrowest. It widens on both sides by 12 mm thickness and extends forward.

Guide 15 placed immediately after the second cutter 12
is equipped with a presser plate 15b protruding to both sides on the upper surface,
Both sides of the carpet A are molded surfaces on which the carpet A slides, and the rear end immediately after the cutter 12 has a thickness corresponding to the thickness of the cutter 12, and gradually becomes thinner toward the tip. It is designed to absorb the restoration of the carpet A in the width direction that occurs after cutting.

As mentioned above, the first cutter 11 and the second cutter 12
Each cut surface of the carpet A to be cut is guided in sliding contact with the guides 14 and 15 at any position and positioned in the width direction, so that accurate cutting can be performed.

In addition, the cut portion of the carpet A is heated by the heating device 13.
Since the coal tar layer is heated in advance to soften the coal tar layer and facilitate cutting, the cut surface of the coal tar layer immediately after cutting stores heat that can be plastically deformed, and the guides 14 and 15 It is possible to shape the cut surface by.

Therefore, as shown in FIGS. 3 and 4, guide 1
Slanted surfaces 14a and 15a are formed with the surfaces on which the carpet cut surfaces of No. 4 and 15 slide facing upward, and the cross-sectional shape is in the direction away from the carpet A, and the cut surface of the carpet A is formed into an inclined surface whose upper part is wider. It is designed to cause plastic deformation.

The molding method of the present invention has the above-mentioned configuration, and the carpet A is fed toward the first cutter 11 while the first and second cutters 11 and 12 are being rotated.

First, the cutting part of the carpet A with the first knife 11 is heated by the heating device 13, and the unnecessary edges on both sides are cut by the first knife 11, and the cut surface of the carpet between the knives 11 on both sides is immediately guided. 14.

Next, when the carpet A advances by a distance L, the central part is cut by the second cutter 12, and the carpet A
There are two pieces, and both cutting surfaces by the second cutter 12 are also guided by the central guide 15.

The cut surfaces of the carpet A by the first and second cutters 11 and 12 are plastically deformed by guides 14 and 15 into inclined surfaces that widen at the top.

The formation of this sloped surface with the upper part protruding outward is achieved by pushing the lower part of the coal tar layer inward against the widened cross-sectional shape of the bottom caused by cutting with a knife, and allowing the pushed part to escape to the upper part. It is sufficient to form it into an upwardly widening inclined surface by making it protrude outward, and such forming is possible by plastic deformation by local heating of the coal tar layer before cutting.

The thus cut carpet is moved in a direction perpendicular to the above-mentioned direction and cut in the same manner, whereby square carpet tiles B are cut out.

The four edges of carpet tile B are sloped surfaces that widen at the top, and when laid on the floor, the fifth
As shown in the figure, the upper part of the base 1 is in close contact with each other, there is no void at the upper part of the abutting part, and the density of the pile 2 is made uniform throughout.

As described above, according to the present invention, the heated portion of the carpet is cut with a knife, the cut surface after cutting is guided in the direction of movement by a guide, and the cut surface of the base is guided in the direction of movement by the guiding surface formed on the guide. While guiding, plastic deformation is performed to match the slope of the guiding surface, and the cut surface is formed into an inclined surface that widens at the top.
The sloped surface of the lower part that is created by cutting with a knife can be made to have an upside-down slope, so when the carpet tile is laid on the floor, there will be no gap at the top of the abutting part. The density of the pile becomes uniform throughout, making it possible to lay the pile without noticeable areas.

In addition, by making the pile density uniform in the abutting portions, it is possible to obtain a carpet tile that can be laid and used in the same way as a single piece, making it possible to put the carpet tile into practical use.

Furthermore, since the carpet is guided immediately after cutting, carpet tiles with high straightness accuracy can be obtained.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view of the carpet in its cut state;
The figure is a plan view of an apparatus for carrying out the molding method of the present invention, FIG. 3 is a longitudinal sectional view of the both side guide parts in the same, FIG. 4 is a longitudinal sectional view of the central guide part, and FIG. FIG. 3 is a longitudinal cross-sectional view showing the state in which PET tiles are laid. A...carpet, B...carpet tile,
11...first knife, 12...second knife, 13...
Heating device, 14, 15... Guide.

Claims (1)

[Claims] 1. A disc-shaped rotary blade for cutting the carpet along the direction of movement is placed on a movable part of the carpet formed by providing piles on the surface of a thermoplastic base, and a rotary blade located at the rear of the carpet in the direction of movement of the carpet. First, a guide is disposed on an inclined surface that extends in the moving direction and guides the cut surface of the carpet base along the moving direction, and the cross-sectional shape of the guiding surface is directed upward and away from the carpet. The heated portion of the moved carpet is cut along the moving direction with a rotary knife, and then, after cutting, the cut surface of the carpet base is brought into sliding pressure contact with the guide surface of the guide,
A method for forming a cut part of a carpet, in which the cut surface of the base is guided in the direction of movement of the carpet by the guiding surface of this guide, and is plastically deformed to match the slope of the guiding surface, thereby forming the cut surface into an inclined surface that spreads at the top. .