JPH0680230B2 - Breathable sheet cutting device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic cutting machine for cutting a breathable sheet to be cut, and particularly when moving a cutter with respect to a breathable sheet to cut the sheet, The present invention relates to a breathable sheet cutting device having a vacuum holding mechanism for fixing a breathable sheet at a fixed position on a support surface.

[Conventional technology]

When cutting a breathable sheet, such as a fabric, for example, the exposed portion of the breathable sheet supported by the support surface is covered with a consumable holding sheet of non-breathing material, and a vacuum is applied to the underside of the holding sheet. As described above, the sheet is attracted and fixed to the support surface, and the sheet to be cut and the consumable holding sheet are integrally cut by the cutter. When the cut groove is formed in the consumable holding sheet, air is introduced from the cut groove to reduce the vacuum pressure and reduce the efficiency of the vacuum holding mechanism.

In order to prevent the efficiency of the vacuum holding mechanism from decreasing, a cutting device equipped with a mechanism that automatically sticks adhesive tape to the kerf and seals the kerf immediately after the kerf is formed is linked to the movement of the cutter. It is shown in Japanese Examined Patent Publication No. 47-40031.

Separately, in order to prevent the deviation of the sheet to be cut around the blade during cutting, a dish-shaped rigid body pressing device centering on the blade is used to apply a pressing pressure from above the sheet to be cut. There is.

[Problems to be Solved by the Invention]

In the conventional kerf sealing mechanism, since the tape to be attached has a width, it is not easy to cause the tape to follow the kerf having a shape in which the moving direction of the cutter changes abruptly. In addition, if the roll diameter of the roll-shaped tape is kept small, the frequency of tape replenishment will increase, and if the frequency of replenishment of the roll-shaped tape will be suppressed, the space for accommodating the tape provided on the cutter support mechanism will increase and the weight will also increase. However, there is an inconvenience that the moving speed of the cutter support mechanism is adversely affected.

Further, a method of recording the number of the cut parts of the sheet to be cut on a consumable holding sheet with a writing instrument to facilitate sorting in a post process is used. Since the kerf on the tape is reattached by the tape, it is not practical because the tape attached at the time of sorting needs to be removed again.

Furthermore, the disadvantages of using a presser device are:
In particular, as a phenomenon that occurs when cutting a highly stretchable fabric material, there is a drawback that the fabric material is displaced in the blade advancing direction due to pressure and cutting resistance, and a desired dimension cannot be obtained. In addition, if the woven material has irregularities, the phenomenon becomes more remarkable, and it has been considered difficult to put it into practical use.

[Means for Solving the Problems]

The present invention has been made in view of the above-mentioned points, and comprises a vacuum holding mechanism for holding a sheet from a plurality of independent blocks, and the vicinity of the blade in the vicinity of the blade in association with the movement of the blade in the vicinity of the blade. Is provided with a suction plate for assisting the holding of the holding sheet, and the groove sealing mechanism using the tape is removed.

[Action]

By dividing the vacuum holding mechanism into a plurality of independent blocks, the holding sheet in the vicinity of the blade being cut is partially made possible by partially limiting the range where vacuum is lost due to the inflow of air from the part where the kerf has already been formed. By adsorbing to the upper surface of the suction plate with a plastic suction disc, the vacuum level between the holding sheet and the suction disc inner wall is raised, and cutting is performed while suppressing vacuum loss from the kerf of the holding sheet near the blade being cut. Is what makes it possible.

Therefore, a desired size can be obtained in any woven material or the like by such a special holding means.

Hereinafter, the present invention will be described in detail with reference to Examples.

〔Example〕

FIG. 1 shows the configuration of the essential parts of an embodiment showing the relationship between a suction disk and a pressure ring to which the present invention is applied. FIG. 2 is an explanatory view showing the relationship between the suction plate and the kerfs.

Here, the suction plate 1 is made of polyethylene terephthalate in a sheet form and is pressure-molded. Further, the shape is circular, the cross section thereof is a gentle convex shape, and a hole H is formed in the central portion so that the blade 2 for cutting can be moved up and down.

That is, the suction plate 1 is fixed to the pressure ring 3 near the hole H.

The pressure ring 3 is attached to a carriage (not shown) that moves the blade during cutting, and is further driven by a vertical drive machine (not shown) in the D and U directions, and the X, Y, and rotation drive mechanisms. The structure allows it to be moved freely.

Now, when the pressure ring 3 is moved in the D direction and brought closer to the holding sheet 4 indicated by the alternate long and short dash line, the suction cup 1 first partially contacts the holding sheet 4, and while deforming, the entire surface of the holding sheet 4 is deformed. Close to each other.

During this time, the air A between the inside of the suction plate 1 and the holding sheet 4 is discharged from the inside of the suction plate 1 to the outside, and the holding of the cut sheet in the portion covered by the suction plate 1 near the blade 2 is strengthened. It This will be further described with reference to FIG. 2 showing the relationship between the suction plate and the kerfs, of which the pressure cylinder is not shown.

In FIG. 2, the dash-dotted line indicates the kerf already formed,
The dotted line is the kerf 5'to be formed.

Since the air loss is large in the vicinity of the portion where the kerf has already been formed, the sheet is liable to shift during cutting and it is difficult to cut accurately.

Then, when the vicinity thereof is covered with the suction plate 1 as shown in the drawing, the air loss is greatly reduced, the holding of the holding sheet 4 near the blade 2 is improved, and the covered area shown by the dotted line near the kerf 5 is improved. Accurate formation of the kerf 5'on the cut sheet is facilitated.

In this way, the suction cup 1 is highly flexible and has a restoring force.
By using, it is possible to obtain an extremely clean kerf because the pressure reduction of the blade portion is eliminated during cutting by following the unevenness of the woven material. In particular, it is optimal as a measure for obtaining more products from a woven material having a certain size and narrowing the kerf spacing in order to improve the yield.

The material of the suction cup described in the present embodiment is not limited to polyethylene terephthalate, and it is natural that any material having excellent flexibility, restoring force, moldability and the like can be used, and the shape can be also changed. Needless to say, the problem can be solved as long as the adsorption pressure can be maintained without being limited to the circular shape. Further, although the suction cup is shown as a single layer structure, it is of course possible to use a concentric circle with different radii such as a multi-layer structure that makes contact with multiple circles.

〔The invention's effect〕

As described above, according to the present invention, by providing a simple suction plate or the like in the vicinity of the blade, it is possible to prevent the deviation of the sheet to be cut due to vacuum leakage in the vicinity of the blade, which is the most problematic at the time of cutting. Can be accurately cut, and a device having an extremely large practical effect can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a main part of an embodiment to which the present invention is applied, and FIG. 2 is an explanatory diagram showing a relationship between a suction plate and a kerf of FIG. 1 ... Suction plate, 2 ... Blade, 3 ... Processing ring, 4 ... Holding sheet, 5,5 '... Cutting groove, A ... Air, H ... Hole.

Claims (1)

[Claims] 1. A sheet to be cut having a breathable sheet supporting surface, a vacuum source, and a non-breathing holding sheet covering the surface supported by the sheet to be cut vacuum from the vacuum source. A cutting mechanism having a moving blade, a cutting mechanism having a moving blade, and a mechanism having a cutting mechanism for moving the cutting groove so as to form a kerf on a sheet to be cut, in the vicinity of the blade. A breathable sheet cutting device, which is provided with a suction plate for interlocking with the movement of the sheet and acting on the upper surface of the holding sheet to help hold the sheet to be cut in the region near the blade being cut.