JP4943013B2 - Sheet material cutting method and sheet material cutting apparatus - Google Patents

Description

  The present invention relates to a sheet material cutting method and a sheet material cutting apparatus.

As a device for cutting thin sheet materials such as fabrics, a support table having air permeability for placing the sheet material in an expanded state, a suction device provided below the support table, and cutting above the support table Some have a cutting head provided with the portion facing downward and a head moving means for moving the cutting head in a plane (see, for example, Patent Document 1).
The suction device is for sucking and holding the sheet material spread on the support table on the support table surface. The present applicant has developed a suction device in which a suction head reduced in size corresponding to the cutting head is moved in a plane integrally with the cutting head, and as a sheet material cutting device equipped with this suction device, has been patented. An application has been filed (Patent Document 1).

The sheet material cutting device according to this patent application is significantly smaller than the conventional sheet material cutting device equipped with a suction device that sucks the entire lower surface of the support table, and a vinyl material is placed on the sheet material. Since it is no longer necessary to cover the adsorption assisting sheet such as a sheet, an advantage that the cutting cost is reduced has been obtained.
The cutting head includes a method of rotating the round blade around a horizontal axis parallel to the upper surface of the support table and a method of moving the cutter blade up and down.

In addition to the fixed type of support table, there is also a table that doubles as a belt belt conveyor by forming it with an upper tension side belt, but it also serves to carry in and out the sheet material, but the cutting head has a round blade, The material of the belt is required to be a material such as felt.
JP 2000-1119950 A

In the sheet material cutting apparatus, as described above, when a round blade (rotary blade) is used as a cutting head, the surface of the support table (material such as felt) is also cut together with the sheet material. If the number increases, the support table is consumed due to an increase in cutting traces (thick thinning occurs), causing problems such as uncut portions in the sheet material.
For this reason, the support table needs to be periodically replaced, but this has a problem that the cutting cost increases. In addition, since the round blade is in the state of being cut into the support table during cutting, the round blade is turned when the cutting head is bent and moved with a sharp turning motion (a curve with a small radius of curvature or corner breakage). This is also a factor that increases the cutting cost.

In addition, the cutting edge of such a round blade becomes a neck, and depending on the material and thickness of the sheet material, there are cases where it is difficult or impossible to perform cutting that requires a curve with a small radius of curvature or corner bending.
The present invention has been made in view of the above circumstances, and in the case of cutting a sheet material with a cutting head using a round blade or the like, the cutting cost can be further reduced, and the curvature radius can be reduced. It is an object of the present invention to provide a sheet material cutting method and a sheet material cutting apparatus that can perform cutting that requires a small curve or corner breakage without a chip of a round blade.

In order to achieve the above object, the present invention has taken the following measures.
That is, in the sheet material cutting method according to the present invention, the spread sheet material is supported by a breathable support table, and the pressurized air is blown to the sheet material through the support table from below the support table. In addition, the peripheral part of the sheet material to which at least pressurized air is blown is sucked downward of the support table, and the locally pressurized air is blown to the sheet material from below and pressurized. While forming a local levitation projecting part that bulges upward by air, the bottom part of the levitation projecting part is adsorbed and held on a support table, and the levitation projecting part is cut. At this time, a member (corresponding to a compressed air ejection portion to be described later) for blowing air pressurized from below on the sheet material is moved in a plane, and a cut is applied to the floating protrusion of the sheet material. A member for this purpose (corresponding to a cutting head to be described later) is also moved in a plane integrally with the member for blowing pressurized air , thereby forming a continuous cutting line.

In this way, if the method is to form a local floating protrusion on the sheet material by the pressurized air blown locally from below the sheet material, and cut the floating protrusion, a cut is applied. Even if a round blade is used as a member for this purpose, it is not necessary to make this round blade touch other than the sheet material (such as a support table used for placing the sheet material). Therefore, for example, the support table for placing the sheet material is not consumed, and the round blade itself is not chipped. As a result, the cutting cost can be reduced.

Further, since the cutting resistance with respect to the sheet material is reduced, there is an advantage that the durability of the round blade can be lengthened and the rotary drive portion of the round blade can be downsized. Even if the sheet material is a fabric or the like and it is a synthetic fiber or the like, there is an advantage that the cutting heat can be suppressed, so that welding to the round blade can be prevented and the cut end can be finished cleanly.
In addition, there is also an effect that the round blade is cooled as the pressurized air hits the round blade, which suppresses the heat of cutting, prevents welding of the synthetic fiber to the round blade, and cleans the cut edge. It will also lead to the finish.

By sucking the peripheral portion of the portion for spraying at least pressurized air in the sheet material to below the support table, since suction to hold the skirt portions to fly projecting onto the support table, small curves and corners if the radius of curvature Even a broken cut can be performed cleanly and reliably.
On the other hand, the sheet material cutting apparatus according to the present invention, a support table and equipped with a ventilation A can be placed in unfolded the sheet material, pressurized toward the support table is provided at the bottom of this support table A compressed air jetting part that can blow up the compressed air locally, and a sheet material that is provided above the support table and that floats and projects locally on the support table with the pressurized air from the compressed air jetting part A cutting head for making a cut in the protrusion, a head moving means for allowing the cutting head to move in a plane along the upper surface of the support table, and an ejection part moving means for allowing the compressed air ejection part to move in a plane below the support table. and, together with the head moving means and the ejection part moving means is a cutting head and a pressure ejection portion in sandwiching the supporting table top and bottom and a possible planar moving integrally with each other, the supporting Below the table, the suction unit is provided at least pressurized air by sucking the peripheral portion of the site to be sprayed suction holding the supporting table in the sheet material.

By setting it as such a structure, the sheet | seat material cutting method which concerns on this invention can be implemented.
Below the support table, there is a suction part that sucks and holds at least the peripheral part of the sheet material where the pressurized air is blown, so that the suction support sheet such as a vinyl sheet is purposely placed on the sheet material. Even if the sheet material is not covered, the sheet material receives a sufficient fixing force to counter the cutting resistance with a relatively small suction force, and the suction device can be miniaturized.

Further, when the sheet material is a cloth or the like, it can be performed cleanly and surely even if it is cut with a small radius of curvature or a broken corner. Of course, since the suction auxiliary sheet can be made unnecessary, the trouble of removing the suction auxiliary sheet from the individual parts after cutting can be eliminated.
The support table is preferably formed of a mesh material. In this way, compared with the case where the support table is made of a material such as felt, the blown air of the pressurized air is better, and as a result, the sheet material spread on the support table can be easily lifted and reliably lifted. I will be able to.

The support table is preferably formed as an upper belt on the belt conveyor. By doing in this way, since cutting work can be performed simultaneously with conveying a sheet material, the efficiency of cutting work can be improved. Further, there is an advantage that the sheet material can be easily supplied and carried out with high efficiency.
The cutting head has a round blade that is rotatable about a horizontal axis parallel to the upper surface of the support table, a rotation drive unit that rotates the round blade, and a swivel that always points the cutting edge of the round blade in the advancing direction of the cutting head. It is good to have a drive part.

  The sheet material cutting method and the sheet material cutting device according to the present invention, when cutting a sheet material by a cutting head using a round blade or the like, further reducing the cutting cost, and the curvature radius Cutting that requires small curves and corner breaks is also possible without chipping with a round blade.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 show an embodiment of a sheet material cutting apparatus 1 according to the present invention. The sheet material cutting device 1 includes a support table 2, a compressed air ejection portion 3 provided at a lower portion of the support table 2, and a cutting head 4 provided above the support table 2. A suction unit 5 is provided below the support table 2 so as to accompany the compressed air ejection unit 3.

  As shown in FIGS. 5 and 6, the cutting head 4 is provided with a head moving means 10 that enables a plane movement along the upper surface of the support table 2, and is supported for the compressed air ejection portion 3. A jet part moving means 11 is provided below the table 2 to enable plane movement. The head moving means 10 and the ejecting part moving means 11 are configured to move the cutting head 4 and the compressed air ejecting part 3 in a plane integrally with each other at the upper and lower parts sandwiching the support table 2.

Note that the sheet material W to be cut is not particularly limited as long as it is thin and flexible, such as a cloth, and the form of supply thereof is also in a roll state. It is good also as what should be continuously unwound in strip | belt shape from a slab, and may be supplied one by one in the state coarsely cut to the predetermined dimension previously.
The support table 2 is for mounting and holding the sheet material W in an expanded state, and has a size that can accommodate this, and has air permeability. The air permeability required for the support table 2 is such that the pressurized air blown up from the compressed air ejection section 3 is allowed to pass locally (spot-like) on the support table 2 without diffusing and not decelerate as much as possible. Is required. For this reason, it is preferable to use a thin mesh material with a fine opening of about 1 mm and a thin material (the wire diameter of the material wire is thin) for the support table 2.

  In the present embodiment, the support table 2 is formed as an upper tension side belt 12 a of the belt belt conveyor 12. Therefore, an endless belt is formed by the mesh material described above, and this endless belt is circulated in one direction by the belt driving unit 13. Since the wire forming the mesh material is preferably excellent in tensile strength, corrosion resistance, flexibility, etc., for example, a wire formed of a stainless wire may be employed.

  Thus, by forming the support table 2 by the belt conveyor 12, not only can the sheet material W be placed and held at the cutting processing position (in the region where the cutting head 4 moves in a plane), Unloading becomes possible. During the cutting operation, the support table 2 (band belt conveyor 12) may be stopped or may be continuously conveyed without being stopped.

The compressed air ejection unit 3 blows up the pressurized air obtained by the compressed air generating device 15 such as a compressor from the lower part of the support table 2 toward the support table 2, and thereby to the sheet material W placed on the support table 2. This is where the pressurized air is blown.
As shown in FIGS. 1 to 3, in this embodiment, air nozzles 16 are arranged in a standing manner between the upper and lower belts 12a and 12b of the belt conveyor 12, and the ends of the nozzles are arranged. The compressed air ejection part 3 is configured by being provided close to the lower surface of the upper tension side belt 12a.

As shown in FIG. 5, the air nozzle 16 is connected to the compressed air generator 15 by a flexible hose 17. The nozzle end of the air nozzle 16 is narrowed so that the tip is thinner, the smallest diameter is 2 mm, and the supply pressure of pressurized air is about 5 kg / cm ² .
The suction part 5 is a place where the peripheral part of the portion of the sheet material W where the air pressurized by the compressed air ejection part 3 is blown is sucked and held on the support table 2.

As shown in FIG. 1, in this embodiment, the suction box 20 is arranged between the upper and lower belts 12a and 12b of the belt belt conveyor 12 with the opening facing upward, and the opening. The suction portion 5 is configured by providing the portion in a state of being close to the lower surface of the upper tension side belt 12a.
At the center of the opening in the suction box 20, the air nozzle 16 of the compressed air ejection part 3 is arranged. That is, the suction box 20 is provided so as to surround the air nozzle 16.

  As shown in FIG. 5, the suction box 20 is appropriately connected to a suction device 21 by a flexible hose 22. A blower or the like can be used for the suction device 21. Further, as shown in FIG. 2, a plurality of partition plates 23 are arranged in parallel at predetermined intervals inside the suction box 20. Each partition plate 23 is parallel to the direction in which the upper belt 12a of the belt belt conveyor 12 forming the support table 2 travels, and when the upper belt 12a is bent, this is used for traveling. It is designed so that it can be supported within the range where there is no influence.

Although not shown, a blade formed of an elastic material such as rubber or sponge is provided at the upper opening end of the suction box 20 and lightly abuts the lower surface of the support table 2, so that the airtightness with the support table 2 is achieved. The relative movement may be facilitated while maintaining the property.
As shown in FIGS. 1, 3, and 4, the sheet material W on the support table 2 is used to locally blow up the pressurized air by the compressed air ejecting portion 3 and to adsorb the peripheral portion of the compressed air blowing portion by the suction portion 5. By receiving the holding at the same time, it comes to rise and protrude onto the support table 2.

  The cutting head 4 is used to make a cut in the floating projecting portion of the sheet material W that has caused the local floating projection on the support table 2 as described above. As shown in FIG. It has a round blade 26 that is rotatable about a horizontal axis 25 parallel to the upper surface. The round blade 26 is rotationally driven by a rotational drive unit 27. Further, as shown in FIGS. 5 and 6, the cutting head 4 is provided with a turning drive unit 28 for always turning the cutting edge of the round blade 13 in the advancing direction, and an elevating drive unit 29 for raising and lowering the round blade 13. Yes.

In the present embodiment, the rotation drive unit 27 (see FIG. 1) has a structure in which a drive wheel 33 driven by a motor 32 and a driven wheel 34 connected to the horizontal shaft 25 are interlocked by a winding transmission means 35. Show.
In addition, the turning drive unit 28 is held by the moving unit 37 via an attachment member 38 with respect to the head moving means 10 for moving the cutting head 4 in a plane. It is held operational. The cutting head 4 is held by the lift drive unit 29 so as to be able to move up and down.

For example, a stepping motor or a servo motor such as a servo motor can be used for the turning drive unit 28, and an air cylinder or the like can be used for the elevating drive unit 29. It should be noted that the upper and lower arrangement order, detailed structure, drive source, and the like of the rotation drive unit 27, the turning drive unit 28, and the elevating drive unit 29 are not limited at all.
The head moving means 10 can move the moving portion 37 (the portion holding the cutting head 4) in an arbitrary direction in the plane by appropriately combining two directions (X direction and Y direction) perpendicular to each other in the plane. It has become. In the same manner, the ejection portion moving means 11 holds the suction box 20 of the suction portion 5 (that is, the air nozzle 16 of the compressed air ejection portion 3) by appropriately combining two directions (X direction and Y direction) orthogonal in the plane. Can be moved in any direction within the plane. Although not shown in the drawings, the head moving means 10 and the ejection part moving means 11 employ a winding drive mechanism, a fluid pressure cylinder such as a rodless cylinder, a feed screw mechanism using a ball screw, or the like. Yes.

  The head moving means 10 and the ejecting part moving means 11 cause the cutting head 4 and the compressed air ejecting part 3 to move in a plane integrally with each other (synchronized in the same speed and in the same direction) at the upper and lower parts sandwiching the support table 2. It is like that. Needless to say, since the suction box 20 of the suction part 5 is in a side-by-side relationship with the compressed air ejection part 3, the suction part 5 also moves integrally with the cutting head 4 and the compressed air ejection part 3. become.

Next, the sheet material cutting method according to the present invention will be described based on the operation status of the sheet material cutting apparatus 1 having the above-described configuration.
When the sheet material W is sent out onto the support table 2 and the sheet material W is spread at the cutting processing position by the support table 2 (band belt conveyor 12), the head moving means 10 moves the cutting head 4 to the sheet. Position to a predetermined cutting start position on the material W.

At the same time, the compressed air ejection part 3 and the suction part 5 are also moved in a plane integrally with the cutting head 4 by the ejection part moving means 11, and these are moved to a position directly below the cutting head 4 sandwiching the sheet material W and the support table 2. The compressed air ejection part 3 and the suction part 5 are positioned.
As described above, the plane movement of the cutting head 4, the compressed air ejection unit 3, and the suction unit 5 is performed while the sheet material W is continuously conveyed without stopping the support table 2 (band belt conveyor 12). It may be performed after being temporarily stopped.

When the cutting head 4, the compressed air ejection unit 3, and the suction unit 5 are moved in a plane, when they reach predetermined positions, the suction unit 5 starts the suction, and at the same time or a little later, the compressed air ejection unit 3 starts from the tip of the air nozzle 16. Pressurized air is blown up. As a result, as shown in FIGS. 1, 3, and 4, the sheet material W is in a locally raised protruding state, and its skirt (peripheral portion) is in an immovable adsorbing and holding state.

In this state, in the cutting head 4, the round blade 26 is rotationally driven by the rotation drive unit 27, the traveling direction (cutting direction) of the round blade 26 is determined by the turning drive unit 28, and the lowering operation is performed by the elevating drive unit 29. A cut by the round blade 26 is made in the floating protrusion of the sheet material W.
Thereafter, the traveling direction (cutting direction) of the round blade 26 is changed by the turning drive unit 28 according to the programmed plane movement operation by the head moving unit 10 and the ejection unit moving unit 11, and the sheet is changed. The cut | interruption put into the material W extends as a cutting line.

  The programmed plane movement by the head moving means 10 and the ejection part moving means 11 may be performed as single movement in the X direction, single movement in the Y direction, or an alternate combination thereof, or the X direction and the Y direction are combined. Needless to say, the movement may be performed in the oblique direction or the curved direction. In this manner, the sheet material W is subjected to arbitrary cutting such as fixed-size cutting, cutting with a predetermined shape, or cutting according to a pattern or the like.

If the method is such that the sheet material W is floated locally by the pressurized air and the floating portion is cut, the round blade 26 of the cutting head 4 does not need to touch other than the sheet material W. As a result, the support table 2 is not consumed, and the round blade 26 itself is not chipped. As a result, the cutting cost can be reduced.
Further, since the cutting resistance with respect to the sheet material W is reduced, there is an advantage that the durability of the round blade 26 can be lengthened and the rotation drive unit 27 of the round blade 26 can be downsized. Even if the sheet material W is a synthetic fiber or the like, there is an advantage that the cutting heat is suppressed, so that the welding to the round blade 26 can be prevented and the cut end can be finished beautifully.

In addition, since the periphery of the portion of the sheet material W that has been lifted and protruded by receiving pressurized air is adsorbed and held on the support table 2, a curve with a small radius of curvature (a curve smaller than a radius of 20 mm is also possible) Even cutting (perpendicular or acute angle) can be performed cleanly and reliably.
By the way, the present invention is not limited to the above embodiment.

For example, the support table 2 may be formed of a silk screen or a flexible perforated plate (resin belt or the like) provided with countless fine holes. Also, materials such as felt and jutan can be used as long as they are rich in breathability.
The suction box 20 of the suction unit 5 may be structured so as to suck only the frame-like portion surrounding the surroundings without including the position where the compressed air ejection unit 3 is provided .

The sheet material W can be used not only for fabrics such as fabrics and synthetic fibers but also for nonwoven fabrics, paper, plastic sheets (films), and the like.

FIG. 6 is an enlarged side sectional view showing a part (around the cutting head) in FIG. 5. It is the perspective view which showed a part (The air nozzle of a compressed air ejection part, and the suction box of a suction part) in FIG. It is the A section enlarged view of FIG. FIG. 4 is a perspective view corresponding to FIG. 3. It is the side view which showed typically one Embodiment of the sheet material cutting device which concerns on this invention. FIG. 6 is a perspective view showing a part (around the cutting head) in FIG. 5.

DESCRIPTION OF SYMBOLS 1 Sheet | seat material cutting device 2 Support table 3 Pressure air ejection part 4 Cutting head 5 Suction part 10 Head moving means 11 Ejection part moving means 12 Band belt conveyor 12a Upper tension side belt 25 Horizontal axis 26 Round blade 27 Rotation drive part 28 Rotation drive part 29 Lifting drive part W Sheet material

Claims (5)

The air which pressurized the sheet material (W) through the support table (2) from below the support table (2) while supporting the spread sheet material (W) by the air-permeable support table (2). In a state of spraying,
While sucking the periphery of the portion of the sheet material (W) that blows at least pressurized air to the lower side of the support table (2),
Blow the locally pressurized air from below the sheet material (W) ,
While supporting the supporting table (2) to adsorb and hold the hem of the part that rises and protrudes while forming a local floating protrusion that protrudes upward by pressurized air ,
Scored on the floating protrusion
While planarly moving a member for blowing air pressurized from below against the sheet material (W),
By moving the plane member integrally with the member for blowing the pressurized air , the member for performing the cut processing on the floating protrusion of the sheet material (W)
A sheet material cutting method, characterized in that the cut line is a continuous cutting line. A support table (2) that can be placed in an expanded state of the sheet material (W) and has air permeability;
A compressed air ejection section (3) provided under the support table (2) and capable of locally blowing air pressurized toward the support table (2);
A cut is formed in the rising protrusion of the sheet material (W) provided above the support table (2) and locally rising and protruding onto the support table (2) with the pressurized air from the compressed air ejection part (3). Cutting head (4) to be inserted;
A head moving means (10) for allowing the cutting head (4) to move in a plane along the upper surface of the support table (2);
A jet part moving means (11) for allowing the compressed air jet part (3) to move in a plane below the support table (2);
The head moving means (10) and the ejecting part moving means (11) can move the cutting head (4) and the compressed air ejecting part (3) in a plane integrally with each other at the upper and lower parts sandwiching the support table (2). and along with that,
Below the support table (2), there is provided a suction part (5) for sucking and holding the peripheral part of the sheet material (W) where at least pressurized air is blown to the support table (2). and has <br/> sheet material cutting device, characterized in that. Said support table (2) is a sheet material cutting apparatus according to claim 2, characterized in that it is formed by mesh material. The sheet material cutting device according to claim 2 or 3, wherein the support table (2) is formed as an upper belt (12a) of a belt conveyor (12). The cutting head (4) includes a round blade (26) that is rotatable about a horizontal axis (25) parallel to the upper surface of the support table (2), and a rotation drive unit (27) that rotates the round blade (26). a) any of claims 2 to 4, characterized in that it comprises the constantly turning drive unit to direct the traveling direction of the cutting head (4) the cutting edge of the round blade (26) and (28) The sheet | seat material cutting device of crab.

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