JPS622960B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting method for cutting carpet tiles of a desired size from a carpet having an elastic backing material on the back side of the facing material.

Carpet tiles have recently become popular as decorative flooring materials for building construction due to their ease of construction, but their composition consists of a surface material with piles planted on a base fabric, rubber, synthetic resin, and asphalt. Generally, the main material is a backing material made of an elastic material such as, and these are stacked and integrated.

Since such carpet tiles are installed on the floor, the precision of the cut dimensions and cut surfaces during manufacturing,
Straightness etc. are extremely important, but since it is made of a composite material as mentioned above, there are various difficult problems in cutting it. For example, as shown in FIG. 1, a conventional device for cutting this type of carpet is
It is known that the cutting edge uses a circular upper blade 4 with a single-sided cut, a lower blade 5, and a retainer 6, and this upper blade 4
rotates freely, but the lower blade 5 is forced to rotate.
In this device, the surface material 2 of the carpet 1, especially the pile, is cut at the point of contact between the flat surfaces of the upper blade 4 and the lower blade 5, and the backing material 3 is pressed down by the holding tool 6 and the lower blade 5. , since the backing material 3 is an elastic body, the contact resistance on the cutting surface 5A side of the lower blade 5 is large;
Since the carpet 1 is curved with respect to the cutting direction and is easily cut, and the upper blade 4 and lower blade 5 are provided in fixed positions, the contact surfaces of the upper blade and the lower blade may wear out, causing the upper blade and the lower blade to There was a problem that a gap was created between the two, resulting in poor sharpness.

Further, as shown in FIG. 2, a circular upper blade 7 with a double-sided cutting edge, a receiving roll 8 having a groove that engages with the upper blade 7, and a holding roll 9 are used, and the receiving roll 8 is forcibly rotated. There is also known a machine that cuts the carpet 1 while feeding the carpet 1 between the presser rolls 9 directly above the carpet. In this device, the carpet is cut on both sides of the upper blade 7, so the straightness is improved, but the upper blade 7 or the receiving roll 8 in contact with the upper blade 7
If a gap is formed in the groove due to wear, the cutting resistance increases because the cutting is done on both sides, resulting in extremely poor cutting ability. Furthermore, due to the shape of the cutting edge of the upper blade 7, the cut surface of the carpet becomes a V-cut as shown in FIG. 3, and when the carpet tiles are laid down, there is a problem in that the joints are left open and the appearance is unfavorable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a carpet cutting method that solves the problems of the prior art as described above, and which can maintain sharpness over a long period of time and achieve extremely high dimensional and other accuracy.

The carpet cutting method of the present invention, which has been made to achieve the above object, includes a disc-shaped cutting blade having sloped blade surfaces on both sides, and a pair of dish-shaped cutting blades having cutting edges pressed against the blade surfaces on both sides of the cutting blade. The cutting blade is forcibly rotated to cut the carpet with the surface material surface facing the receiving blade side and the backing material surface facing the cutting blade side.

Hereinafter, the present invention will be explained in more detail using embodiments shown in FIG. 4 and subsequent figures.

FIGS. 4 and 5 show an example of a cutting device used to carry out the method of the present invention, and this cutting device has a disc-shaped cutting blade 10 and a pair of dish-shaped receiving blades 11, 11. . As shown in an enlarged view in FIG. 6, the cutting blade 10 has a cutting edge 12 that is cut on both sides, so that both sides of the cutting edge 12 have symmetrically inclined blade surfaces 12A, 12A, respectively. The cutting edge angle θ ₁ of the cutting edge 12 is formed to be an acute angle. On the other hand, the dish-shaped receiving blade 11 has a cutting edge 13 at its peripheral edge, and both the outer blade surface 13A and the inner blade surface 13B are inclined with respect to the plane AA perpendicular to the rotation axis. Therefore, the cutting edge angle θ ₂ of the cutting edge 13 is also an acute angle.

Referring again to FIG. 4, the cutting blade 10 is fixed on a drive shaft 14 connected to a drive device (not shown) and forced to rotate about a rotation axis BB. The pair of dish-shaped receiver blades 11, 11 are slidably held by splines 16, 16 of drive shafts 15, 15, respectively, having a rotation axis CC parallel to the rotation axis BB, and are connected to the drive shaft 15. Rotate to . Drive shaft 1
5 and 15 are also forcibly rotated by a drive device (not shown), and accordingly, the dish-shaped receiving blades 11 and 11 are also forcibly rotated. The drive shafts 15, 15 further include disks 17, 1
7 is fixedly held, and coil springs 18, 18 are arranged between the disks 17, 17 and the dish-shaped receiving blades 11, 11. The coil springs 18, 18 push the dish-shaped receiving blades 11, 11 to slide relative to the drive shafts 15, 15, so that the cutting edges Y13, 13 of the dish-shaped receiving blades 11, 11 as shown in FIG. It is always pressed against the blade surfaces 12A, 12A of the cutting blade 10. In this embodiment, the coil springs 18, 18 constitute a means for pressing the dish-shaped receiving blade so that its cutting edge comes into pressure contact with the blade surface of the cutting blade, but instead of the coil springs, air pressure, hydraulic pressure, etc. may be used. It's okay. Moreover, instead of making the dish-shaped receiving blade slidable with respect to the drive shaft 15, the dish-shaped receiving blade is fixed to the driving shaft 15, and the driving shaft is pushed in the axial direction to move the cutting edge 13 of the dish-shaped receiving blade to the cutting blade. It may be made to come into pressure contact with the blade surface 12A of No. 10. Since the cutting blade 10 and the receiving blade 11 are constantly in pressure contact with each other, wear is likely to occur. Therefore, it is preferable that the hardness of the cutting blade and the receiving blade be different from each other so that one of them is mainly worn.

In FIG. 5, between the rotational axis B of the cutting blade 10 and the rotational axis C of the dish-shaped receiving blade 11, there is a carpet receiving stand 19 that carries the carpet 1 and moves horizontally to the right. Above the cutting blade 1
There is a holddown roll 20 which prevents the carpet from being lifted up by a pressing force of zero. Holding roll 2
As shown in FIG. 4, a pair of blades 0 are provided near both sides of the plate-shaped receiving blades 11, 11. Referring again to FIG. 5, the rotational axis C of the dish-shaped receiving blade 11 is shifted toward the carpet supply side by a distance l with respect to the straight line D--D passing through the rotational axis B of the cutting blade 10 and perpendicular to the carpet running surface. Therefore, the contact point 21 between the cutting edge of the dish-shaped receiver blade 11 and the cutting surface of the cutting blade 10, that is, the cutting point 21, also lies on the straight line D.
- It is shifted to the carpet supply side from D. This effect will be discussed later.

Next, a carpet cutting method using the cutting device having the above structure will be explained. The cutting blade 10 and the receiving blade 11 are the fifth
It is forcibly rotated in the directions shown by arrows E and F in the figure. The carpet 1 is placed on a carpet pedestal 19 with the surface material 2 facing the receiving blade 11 side and the backing material 3 facing the cutting blade 10 side, and is moved in the direction shown by arrow G, that is, from left to right in the drawing. The cutting blade 10 is sent in the direction
and the receiving blade 11. At this time, the carpet is passed through so that the surface material 2 passes through the contact point 21 between the cutting blade 10 and the receiving blade 11. First, the backing material 3 of the carpet 1 is cut off with the cutting blade 10. Since the cutting blade 10 has sloped blade surfaces on both sides, it is possible to cut the carpet in an accurate straight line. At this time, the carpet 1 tends to be pushed upward by the pressing force of the cutting blade 10, but since the pair of holding rolls 20, 20 press down on the carpet, good cutting is performed. Next, the pile fiber layer of the surface material 2 is pushed and rubbed off at the point of contact between the blade surface of the cutting blade 10 and the cutting edge of the receiving blade 11. At this time, since the cutting edge of the receiving blade 11 is always strongly pressed against the blade surface of the cutting blade 10, good cutting can be performed regardless of whether or not the cutting edge is worn. Note that if the moving speeds of the cutting edge of the receiving blade 11 and the blade surface of the cutting blade match at the contact point 21, fine fibers may remain caught between the upper and lower blades and come out without being cut. Therefore, the rotational speeds of the cutting blade 10 and the receiving blade 11 are determined so that the moving speeds of the two are different. Through various test cuts,
The most favorable results were obtained when the running speed of the carpet pedestal 19 and the circumferential speed of the cutting blade 10 were made to match, and the circumferential speed of the receiving blade 11 was made slower than the circumferential speed of the cutting blade 10.

As described above, in this embodiment, the rotational axis CC of the receiving blade 11 is shifted toward the carpet supply side.
For this reason, the passage position of the backing material 3 of the carpet 1 is lowered, and the angle α (see Fig. 5) at which the cutting blade 10 cuts into the carpet 1 increases, and a large cutting force against the backing material 3 is obtained. Surface accuracy is improved and the finish is beautiful. The horizontal distance l between the axis of rotation of the cutting blade 10 and the axis of rotation of the receiving blade 11 is determined depending on the thickness of the carpet and the diameters of the cutting blade and the receiving blade, as long as the backing material 3 does not contact the receiving blade 11 first. Therefore, in this embodiment, the rotation axis position can be adjusted.

According to the above-mentioned apparatus and method, the cutting blade 10 cuts from the backing material surface of the carpet, so the obtained carpet tile has an inverted V cut as shown in Fig. 7, and has a good shape with no gap during construction. exhibit an appearance.

In the above embodiment, the carpet was placed on a self-propelled carpet holder and supplied between the cutting blade and the receiving blade, but the present invention is not limited to this, and a conveyor system may be used, or vice versa. Alternatively, the carpet may be left still, and the cutting blade and receiving blade may be run along the carpet.

As described in detail above, according to the present invention, since the carpet is cut from the backing material side with a disc-shaped cutting blade having blade surfaces inclined on both sides, the straightness of the carpet tile obtained by double-sided cutting is improved. improved,
Moreover, the end face of the carpet tile has an inverted V cut. Furthermore, since the hard-to-cut surface material of the carpet is cut by pressing the acute-angled cutting edge of the dish-shaped receiving blade against the cutting surface of the cutting blade, reliable cutting is possible. Thus, the present invention has the excellent effect of making it possible to obtain a beautiful carpet tile with excellent dimensional accuracy and no gaping at the joints during construction.

[Brief explanation of the drawing]

Figures 1 and 2 are front views showing conventional examples, Figure 3 is a front view of carpet tiles obtained by cutting with the apparatus shown in Figure 2, and Figures 4 to 6.
The figures are a front sectional view, a side view, and a partially enlarged front sectional view showing one embodiment of the present invention, and FIG. 7 is a front sectional view of a carpet tile obtained by cutting according to the above embodiment. . 1...Carpet, 2...Surface material, 3...Backing material, 1
0... Cutting blade, 11... Receiving blade, 12A... Blade surface, 13...
Blade tip, 15... Drive shaft, 18... Coil spring, 19...
Carpet pedestal, 20...pressing roll.

Claims (1)

[Scope of Claims] 1. A method for cutting a carpet in which a backing material made of an elastic material is provided on the back surface of a surface layer material, in which a disc-shaped cutting blade having blade surfaces inclined on both sides and pressure contact with the blade surfaces on both sides of the cutting blade are provided. A carpet cutting method characterized by forcibly rotating a pair of dish-shaped receiver blades having cutting edges that cut the carpet so that the surface material surface of the carpet faces the receiving blade side and the backing material surface faces the cutting blade side. . 2. Carpet cutting according to claim 1, wherein the moving speed of the blade surface of the cutting blade at the point of contact with the cutting edge of the receiving blade is different from the moving speed of the cutting edge of the receiving blade. Method. 3. Claim No. 3, characterized in that the cutting edge of the receiving blade contacts the blade surface of the cutting blade on the carpet supply side with respect to a straight line passing through the rotational axis of the cutting blade and perpendicular to the carpet being cut. The carpet cutting method according to item 1 or 2.