JPH04119166A - Air-diffusible sheet-cutting device - Google Patents

Abstract

PURPOSE:To accurately cut a sheet by inhibiting displacement of the sheet even in generating leakage of vacuum owing to the existence of cut groove, etc., in the vicinity of cutting position by providing an adsorbing disk in the vicinity of a blade. CONSTITUTION:In an automatic cutter of a sheet having air-diffusibility such as woven cloth, a pressurizing ring 3 is moved to D-direction by driving a carriage above an air-diffusible sheet to be cut covered its upper face with an air-nondiffusible consumable holding sheet 4, and an adsorbing disk 1 fitted on said ring 3 and having gentle protruding cross section with round horizontal plane composed of a polyester sheet, etc., is brought into contact with the holding sheet 4, then air between inside of the adsorbing disk 1 and the holding sheet 4 is discharged to outside, thus the adsorbing disk is adhered with the holding sheet. Next, a fixed cutting is performed by driving the blade 2. In the cutting, displacement of the sheet to be cut is not occurred even when a cut groove exists in the vicinity of the cutting point and the leakage of vacuum is happened in a cutting stage, because the holding sheet 4 is surely held by the adsorbing disk 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an automatic cutting machine for cutting breathable sheets to be cut, and in particular, the present invention relates to an automatic cutting machine for cutting breathable sheets to be cut.

The present invention relates to a breathable sheet cutting device having a vacuum holding mechanism for fixing the breathable sheet in a fixed position on a support surface when the breathable sheet is moved and cut.

[Conventional technology]

When cutting a material such as a breathable sheet, for example a textile, the exposed portion of the breathable sheet supported by the support surface is covered by a consumable holding sheet of non-breathable material, and a vacuum is applied to the underside of this holding sheet. The sheet is attracted and fixed to the support surface in this manner, and the cutter cuts the sheet to be cut and the consumable holding sheet into one piece. When grooves are formed in the consumable holding sheet, air enters through the grooves, reducing the vacuum pressure and reducing the efficiency of the vacuum holding mechanism.

In order to prevent the efficiency of this vacuum holding mechanism from decreasing, immediately after the kerf is formed, adhesive tape is automatically applied to the kerf in conjunction with the movement of the force and force, and the cutting mechanism is equipped with a mechanism that performs continuous cutting. A device is disclosed in Japanese Patent Publication No. 47-40031.

Another known cutting method is to apply pressure from above the sheet to be cut using a plate-shaped rigid valve device centered around the blade, in order to prevent the sheet from shifting around the blade during cutting. ing.

[Problem to be solved by the invention]

In the conventional kerf sealing mechanism, since the tape to be applied has a width, it is not easy to make the tape follow a kerf shape that causes a sudden change in the direction of movement of the cutter. Furthermore, if the roll diameter of the rolled tape is kept small, the WA variation of tape replenishment will increase, and if the frequency of replenishment of the rolled tape is to be reduced, the space provided on the force retractor support mechanism for accommodating the tape will become larger and the weight will increase. This is disadvantageous in that the movement speed of the cutter support mechanism is adversely affected.

Furthermore, a method is used in which the number of the cut parts of the sheet to be cut is recorded with a writing instrument on the consumable holding sheet to facilitate sorting in the subsequent process. Since the cut grooves on the paper were re-attached with tape, it was sometimes necessary to remove the tape again during sorting, which was impractical.

Furthermore, the disadvantages of using a presser device are:
In particular, a phenomenon that occurs when cutting textile materials with large expansion and contraction is that the textile material shifts in the direction of movement of the blade due to compression and cutting resistance, making it impossible to obtain desired dimensions. In addition, if the textile material has irregularities, the phenomenon becomes even more pronounced, making it difficult to put it into practical use.

[Means to solve the problem]

The present invention has been made in view of the above-mentioned points, and includes a vacuum holding mechanism for holding a sheet made up of a plurality of independent blades, and a blade disposed near the blade that moves in conjunction with the movement of the blade. A suction cup is provided to help hold the holding sheet in the vicinity, and the groove sealing mechanism using tape is removed.

[For production]

By dividing the vacuum holding mechanism into multiple independent blocks, the area where vacuum loss occurs due to the inflow of air from the part where the kerf has already been formed is limited to only a portion, and the holding sheet near the blade during cutting is By suctioning the top surface with a suction cup made of resin, the degree of vacuum between the holding sheet and the inner wall of the suction cup is increased, while suppressing vacuum loss from the groove of the holding sheet near the cutting blade. This makes it possible to cut.

Therefore, by using such special pressing means, desired dimensions can be obtained for any textile material or the like.

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

〔Example〕

FIG. 1 shows the main structure of an embodiment showing the relationship between a suction cup and a pressure ring to which the present invention is applied. Moreover, FIG. 2 is an explanatory diagram showing the relationship between the suction cup and the groove.

The material of the suction cup 1 is polyethylene terephthalate, which is press-molded into a sheet shape. Further, the shape is circular, the cross section thereof is gently convex, and a hole H is formed in the center so that the cutting blade 2 can be moved up and down.

That is, the suction cup 1 is fixed near the hole H of the pressure ring 31.

The pressure ring 3 is attached to a carrier (not shown) that moves the blade during cutting, and is further moved in the D direction and the U direction by a vertical drive machine (not shown).

It has a structure that allows it to be freely moved by a drive mechanism such as one rotation of the X axis and Y axis.

Now, when the pressure ring 3 is moved in the D direction and brought close to the holding sheet 4 indicated by the - dotted chain line, the suction cup 1 first partially contacts the holding sheet 4 and deforms as it approaches the holding sheet 4. Adhere completely.

During this time, the air A between the inside of the suction cup 1 and the holding sheet 4 is discharged from the inside of the suction cup 1 to the outside, and the holding of the sheet to be cut in the area covered by the suction cup 1 near the blade 2 is strengthened. Ru. This will be further explained with reference to FIG. 2, which shows the relationship between the suction cup and the kerf, with the pressure cylinder not shown.

In FIG. 2, the - dotted line indicates the already formed kerf,
The dotted line indicates the kerf 5' that will be formed from now on. Since air loss is large in the vicinity of the area where the kerf is already formed, the sheet tends to shift during cutting, making it difficult to cut accurately.

However, when the vicinity is covered with the suction cup 1 as shown in the figure, the air loss is greatly reduced and the retention of the holding sheet 4 near the blade 2 is improved, and the area near the cut groove 5 shown by the dotted line is Accurate cutting grooves 5' can be easily formed on the cut sheet.

In this way, the suction cup l which is highly flexible and has restoring force etc.
By using the cutting tool, it follows the unevenness of the textile material and eliminates the vacuum of pressure at the blade part during cutting, making it possible to obtain extremely clean cuts. In particular, it is ideal for narrowing the kerf spacing in order to obtain more products from a given size of textile material and improve yield.

Note that the material of the suction cup explained in this example is not limited to polyethylene terephthalate, but any material with excellent flexibility, restoring force, moldability, etc. can be used, and the shape can also be changed. Needless to say, the problem can be solved regardless of the circular shape as long as the adsorption pressure can be maintained.

Further, although a single-layer suction cup has been shown, it is of course possible to use a suction cup with multiple layers of concentric circles with different radii, or a suction cup that contacts with multiple circles.

〔Effect of the invention〕

As explained above, according to the present invention, by providing a simple suction cup or the like near the blade, displacement of the sheet to be cut due to vacuum leakage near the blade, which is the most problematic during cutting, can be prevented. It is possible to provide a device that can cut accurately and has extremely great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main structure of an embodiment to which the present invention is applied, and FIG. 2 is an explanatory diagram showing the relationship between the suction cup and the groove in FIG. 1. l...suction cup, 2...blade, 3...
...Processing ring, 4...Holding sheet, 5.5'
...kerf, A... air, H...
...hole.

Claims (1)

[Claims] 1. A breathable support surface of the sheet to be cut, a vacuum source, and the vacuum from this vacuum source is applied to the surface of the sheet to be cut, the surface of which is supported by the support surface of the sheet to be cut is covered with a non-breathable holding sheet. In a cutting device comprising a mechanism for holding the cutting mechanism, a cutting mechanism having a movable blade, and a mechanism for holding the cutting mechanism that moves so as to form a kerf in the sheet to be cut, the cutting device includes a mechanism for holding the cutting mechanism that moves so as to form a kerf in the sheet to be cut. An air-permeable sheet cutting device characterized in that it is equipped with a suction cup that acts on the upper surface of the holding sheet to help hold the sheet in the vicinity of the blade during cutting.