JP2011195979A - Apparatus and method for cutting fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method capable of cutting out fabric parts with a specific correlation with respect to its patterns without influenced by the deformation or the positional deviation of the patterns resulting from the stretch or the shrinkage of raw fabric, even in a case of plain fabric made to have patterns and prepared by roughly cutting raw fabric at its four sides by manual work.SOLUTION: The apparatus for cutting fabric includes a cutting table 2 for supporting raw fabric W whereon a plurality of point marks P1 to P4 are displayed, a cutting head 3 for cutting the raw fabric W, a head-moving mechanism 4 causing the cutting head 3 to ascend/descend, to horizontally turn, and to horizontally move, a detection device 20 for detecting the point marks P1 to P4, a correction member 21 defining the raw fabric W into a plurality of sections according to the point marks P1 to P4, and calculating the shrinkage of each of the sections to produce correction data according to the deformation and the positional deviation of patterns HA and HB, and an action controller 22 controlling the head-moving mechanism 4, based on the correction data produced for use in cutting the raw fabric W.

Description

  The present invention relates to a fabric cutting device and a fabric cutting method that can be suitably employed when cutting a fabric part from a material fabric.

As a cutting device for cutting out body parts such as the body and sleeves used in the production of clothing from the material cloth, the cutting head equipped with a rotary blade such as a round blade can be raised and lowered on the cutting table, horizontally swiveled, and swivel angle. A configuration that performs fixed linear movement, curved movement while simultaneously performing horizontal turning, and the like (hereinafter collectively referred to as “moving operation”) is well known.
In this type of cutting apparatus, the movement operation of the cutting head is controlled based on cutting data (a value obtained by converting the contour of the fabric part into a numerical value) that is set and input during cutting. However, in most cases, the material fabric is stretched due to fiber characteristics and various processing steps, so the cutting data is not used as it is, but the material fabric actually spread on the cutting table. A correction according to individual expansion and contraction is applied to the target.

This correction method is applied when cutting plain material fabrics and when applying material fabrics with patterns (including pictures, patterns, coloring, etc.) along the patterns. Separated.
For example, the following has been proposed as a correction method when cutting a plain material cloth. That is, the dimension from this reference side to the other side is measured on the basis of one side of the material fabric, and the maximum width of the cutting data is the measured value (the actual fabric width causing expansion / contraction). This is a correction method of enlarging or reducing the cutting data so as to fit without excess or deficiency (see Patent Document 1).

In this correction method, the material fabric is a tubular fabric knitted by a circular knitting machine, and the tubular fabric is flattened on a cutting table so that linear folding edges are formed on both sides in the width direction. In the case where it is generated, it can be suitably applied. That is, one of the folded sides is set as the reference side.
If this correction method is employed, the fabric part can be cut out without being adversely affected by the expansion and contraction of the material fabric. Here, “adverse effect” refers to partial missing of a fabric part (defective shape) when the material fabric is shrunk, occurrence of a wasteful cut of the material fabric when the material fabric is stretched, and the like.

On the other hand, for example, the following has been proposed as a correction method in the case of cutting a material cloth with a pattern along the pattern. That is, at the time of printing a part constituent part (a part to be a fabric part after cutting and given an individual pattern), a point mark is attached in close proximity to each part constituent part at the same time.
The print data used for this print contains the position information of each part component and the position information of each point mark, so naturally the relative positional relationship between these part components and the point mark (Associated position information) is also included. Note that each of these pieces of position information is assumed to be coordinates. That is, the “point mark” referred to here is merely an index that suggests in which direction and how far away from the notation position the individual part component parts are arranged.

  After making this preparation, the material fabric is image-processed to detect each point mark, and its position information is acquired. Then, the positional information related to the actual measurement is compared with the positional information of the point mark in the print data to calculate the deviation amount, and based on the deviation amount, the positional information (corresponding) of the corresponding (associated) part component part ( This is a correction method of correcting the position to be cut (see Patent Document 2).

JP 2007-239155 A Japanese Patent No. 4054556

  The material fabric is not a cylindrical fabric, but is a flat fabric that has been roughly cut on four sides by hand, for example, or a strip-shaped fabric that has been unwound from a roll roll, and also has a pattern that corresponds to the fabric part. If the fabric part is attached, cut out the fabric part so that it matches the contour of the pattern (the contour of the fabric part obtained by cutting and the contour of the pattern attached to this fabric part will cause misalignment). It was very difficult to avoid).

This is because the expansion and contraction of the material fabric naturally derives the effects of misalignment and deformation (scaling and distortion) on the pattern itself, and the extent and direction of the expansion and contraction are not uniform. This is because it is various in various places.
The conventional correction method (disclosed in Patent Document 2) that corrects the cutting data for a material material with a pattern is intended to correct the position of the part component part. The shape itself (cutting data) is not enlarged or reduced at all. In that sense, even if the parts constituting part (pattern) itself is deformed due to the expansion and contraction occurring in the material fabric, it cannot be corrected at all.

  Therefore, there are many cases where the outline of the fabric part obtained by the cutting and the outline of the pattern attached to the fabric part are misaligned. In particular, when the patterning is performed by ink jet or textile printing (stencil: partial dyeing) etc., the stretching of the material fabric is caused by pretreatment such as bleaching and post-treatment such as drying. Furthermore, the degree tends to be large and complex. Therefore, the problem (positional deviation between the fabric part outline and the pattern outline) is also a big problem.

  Not only that, but the parts components and point marks that are in a corresponding relationship need to have a unique positional relationship. It is essential to change the print data so that the mark also has a unique positional relationship. Therefore, there is a drawback that the types of print data to be handled are enormous, and data storage and data creation becomes extremely troublesome and confusing.

Furthermore, at the time of cutting, it is bothersome and difficult to move the detection camera in order to detect each point mark scattered in people, and this requires time (the work efficiency as cutting work is reduced). (Very low).
On the other hand, with the conventional correction method (disclosed in Patent Document 1) that corrects the cutting data for plain material fabrics, naturally, for patterns that are not assumed in the first place, the displacement and deformation of the patterns are naturally recognized. No consideration at all. That is, since the cutting pattern is corrected based only on the expansion and contraction of the material cloth, it cannot be applied to the cutting of the material cloth with a pattern.

Further, in this correction method, since the side portion that should be used as a reference when measuring the fabric width is important in terms of action, the material fabric is not limited to the cylindrical fabric, for example, manually. There was a difficulty that it was difficult to apply to flat fabrics that were roughly cut on all sides.
As described above, in both of the conventionally known correction methods, it is not possible to simultaneously correct the positional deviation of the pattern and the deformation of the pattern itself. The fabric parts could not be cut with a predetermined correlation.

Note that neither of these two correction methods has the technical idea of correcting the deformation of the pattern itself. In addition, these two correction methods are different from each other in terms of the premise (the difference between whether the material fabric is plain or with a pattern, etc.), the purpose of data correction, and the effects. Therefore, it must be said that the combination itself is impossible.
The present invention has been made in view of the above circumstances, and is a flat fabric or a strip-shaped fabric unrolled from a roll wound body in which the material fabric is roughly cut on four sides and cut out. Even when a pattern corresponding to the fabric part is attached, the fabric part has a predetermined correlation with the pattern without being affected by the displacement or deformation of the pattern due to the expansion and contraction of the material fabric. An object of the present invention is to provide a cloth cutting device and a cloth cutting method that can cut a sheet.

  It is another object of the present invention to provide a fabric cutting apparatus and a fabric cutting method that can flexibly cope with a change in pattern and the like, and that can perform a cutting operation with high efficiency.

In order to achieve the above object, the present invention has taken the following measures.
That is, the cloth cutting device according to the present invention is for cutting a material cloth with a pattern, on which a plurality of point marks are displayed as a guide when dividing into a plurality of sections, in correlation with the pattern. And a cutting table, a cutting head, a head moving mechanism, a detection device, a correction processing unit, and an operation control unit.

Here, “cutting in correlation with the pattern” means cutting the fabric part so that it matches or follows the outline of the pattern, or cutting to capture the pattern in a predetermined arrangement in the fabric part. This refers to cutting while maintaining a close positional relationship between the fabric part to be cut out and the handle.
The cutting table is where the material fabric is spread and supported.

The cutting head is provided above the cutting table to cut the material cloth on the cutting table.
The head moving mechanism is where the cutting head moves up and down, horizontally swivels, and moves horizontally.
The detection device is a place for detecting each point mark from the material cloth on the cutting table.

Further, the correction processing unit divides the material fabric into a plurality of sections, and uses an imaginary line obtained by connecting the point marks detected by the detection device or a straight line parallel thereto as a reference. The stretch rate of the material fabric is obtained for each of the sections, and correction data corresponding to the positional deviation of the pattern and the deformation of the pattern is created for each section based on the stretch ratio.
The operation control unit controls the head moving mechanism based on the correction data for cutting created by the correction processing unit.

  On the other hand, the cloth cutting method according to the present invention displays a plurality of point marks as a guideline for dividing a material cloth with a pattern into a plurality of sections, and detects each point mark from the spread material cloth. And dividing the material fabric into a plurality of sections, and on the basis of an imaginary line obtained by connecting the point marks or a straight line parallel thereto, the stretch ratio of the material fabric is determined for each section, The correction data for cutting according to the positional deviation of the pattern and the deformation of the pattern is created for each section based on the obtained stretch rate, and the material fabric is cut based on the obtained correction data .

  The point marks to be displayed on the material cloth may be made to correspond to the four corners of the pattern frame indicated by surrounding the pattern distribution area with a virtual rectangle. In this case, the expansion / contraction rate was obtained by setting an intermediate dividing line that partitions between a plurality of virtual lines or between a plurality of straight lines, and then measuring an interval between the intermediate dividing line and each line. What is necessary is just to obtain | require by comparing with a numerical value and the pattern division value obtained from the said pattern frame.

  Further, with respect to the pattern frame rectangle, a horizontal intermediate dividing line is set at a position that bisects the opposite two sides whose line direction is horizontal, and a position that bisects the two opposite sides whose line direction is vertical A vertical middle dividing line is set in the upper and lower sides of the horizontal intermediate dividing line, and correction is made on both the upper and lower sides of the horizontal intermediate dividing line. It may be.

Here, “horizontal orientation” and “vertical orientation” are attached for the convenience of explanation (for easy identification) on the premise that the horizontal intermediate dividing line and the vertical intermediate dividing line are orthogonal to each other. The direction in the plane is not limited to a direction or a numerical angle.
Naturally, the “rectangle” of the pattern frame includes a square.
More specifically, the dough cutting method according to the present invention is as follows.

That is, first, a material cutting device that cuts out a material part by correlating the material material with a pattern corresponding to the material part and cutting out the material part is surrounded by a virtual rectangle and instructed. A pattern frame and a master pattern for instructing an ideal pattern arrangement within the pattern frame are initialized by input.
For the material fabric, first to fourth point marks are displayed corresponding to the four corners of the pattern frame.

And the said 1st-4th point mark is detected in the state which expanded the said raw material cloth on the cutting table which a cloth cutting apparatus comprises.
Next, a virtual line connecting the first point mark and the second point mark arranged away from the first point mark in the side direction or a virtual line parallel thereto is set as a 1-2 system straight line. .

Next, a third point mark arranged on the opposite side of the first point mark, and a fourth point mark arranged on the opposite side of the second point mark away from the third point mark in the side direction A connecting virtual line or a virtual line parallel to the connecting virtual line is set as a 3-4 system straight line.
Next, the intermediate mark existing between the first point mark and the third point mark and the intermediate mark existing between the second point mark and the fourth point mark are connected to each other, thereby An intermediate dividing line that partitions between the 2 system straight line and the 3-4 system straight line is set.

Then, an initial value at which the intermediate dividing line should exist between the 1-2 system straight line and the 3-4 system straight line is calculated as a pattern division value from an edge corresponding to the 1-2 system straight line in the pattern frame. In addition, it is calculated as a pattern division value from the edge corresponding to the 3-4 system straight line.
Next, over the entire length of the 1-2 system straight line, the measured value of the mutual distance between the 1-2 system straight line and the intermediate dividing line is compared with the pattern division value to obtain the 1-2 system expansion / contraction rate.

And about the pattern contained in the division pinched | interposed by the said 1-2 type | system | group straight line and a middle division line, the outline coordinate in the said master pattern is correct | amended with the said 1-2 type | system | group expansion / contraction rate, and 1-2 with respect to the said pattern. Find correction data for system cutting.
Further, the 3-4 system expansion / contraction ratio is obtained by comparing the measured value of the mutual distance between the 3-4 system straight line and the intermediate dividing line with the pattern division value over the entire length of the 3-4 system straight line.

Then, the contour coordinates in the master pattern are corrected with the 3-4 system expansion / contraction ratio for the pattern included in the section sandwiched between the 3-4 system straight line and the middle section line, and 3-4 with respect to the pattern Find correction data for system cutting.
The material dough on the cutting table is cut by the cutting head using the correction data for cutting of the 1-2 system and the 3-4 system obtained in this way.

In this case, it is preferable to add the following procedure in advance, following or in parallel with obtaining the correction data for the 1-2 system and 3-4 system.
That is, a virtual line connecting the first point mark and the third point mark or a virtual line parallel thereto is set as a 1-3 system straight line.
Next, a virtual line connecting the second point mark and the fourth point mark or a virtual line parallel thereto is set as a 2-4 system straight line.

Next, the intermediate mark existing between the first point mark and the second point mark and the intermediate mark existing between the third point mark and the fourth point mark are connected to each other, thereby An intermediate dividing line that divides the 3 system straight line and the 2-4 system straight line is set.
Then, an initial value at which the intermediate dividing line should exist between the 1-3 system straight line and the 2-4 system straight line is defined as a pattern division value from an edge corresponding to the 1-3 system straight line in the pattern frame, and It is calculated as a pattern division value from the edge corresponding to the 2-4 system straight line.

Next, over the entire length of the 1-3 system straight line, the measured value of the mutual distance between the 1-3 system straight line and the intermediate dividing line is compared with the pattern division value to obtain the 1-3 system expansion / contraction rate.
Then, for the pattern included in the section sandwiched between the 1-3 system straight line and the middle section line, the contour coordinates in the master pattern are corrected with the 1-3 system expansion / contraction rate, and the 1-3 system for the pattern The correction data for cutting is obtained.

Further, the 2-4 system expansion / contraction ratio is obtained by comparing the measured value of the mutual distance between the 2-4 system straight line and the intermediate dividing line with the pattern division value over the entire length of the 2-4 system straight line.
And about the pattern contained in the division pinched | interposed by the said 2-4 system straight line and the middle division line, the outline coordinate in the said master pattern is correct | amended with the said 2-4 system expansion / contraction rate, 2-4 system with respect to the said pattern The correction data for cutting is obtained.

In addition, together with the correction data for cutting of the 1-2 system and 3-4 system, the correction data for cutting of the 2-4 system and the 1-3 system are used together, and the material fabric on the cutting table is made by the cutting head. It is to cut.
The intermediate mark used for setting the intermediate dividing line between the 1-2 system straight line and the 3-4 system straight line and for setting the intermediate dividing line between the 1-3 system straight line and the 2-4 system straight line is It is good also as one point in a handle.

  The dough cutting apparatus and the dough cutting method according to the present invention are flat fabrics in which the material dough is roughly cut on four sides by hand, or belt-like dough unrolled from a roll wound body, and the like. Even when a pattern corresponding to the fabric part is attached, the fabric part is cut with a predetermined correlation with the pattern without being affected by the displacement and deformation of the pattern due to the expansion and contraction of the material fabric. be able to.

  In addition, it can flexibly cope with pattern changes, and cutting operations can be performed with high efficiency.

It is the side view which showed typically one Embodiment of the fabric cutting apparatus which concerns on this invention. (A) is a plan view showing a cut fabric spread on a cutting table, and (B) is a view showing a pattern frame input to the correction processing unit as an image. It is the figure which showed the image of the raw material cloth detected by the detection apparatus as data. It is the block block diagram which showed the control structure of the fabric cutting apparatus. 1A and 1B are diagrams illustrating a process of creating first and second correction data, where FIG. 3A is a diagram illustrating a pattern frame, and FIG. 3B is a data of a material cloth image detected by a detection device. (C) is a diagram showing, as data, an image of the material fabric after the creation of the first correction data. The process of creating the first and second correction data has been described, and (A) is a diagram showing the image of the material fabric after the creation of the first correction data as data (substantially the same as FIG. 5C). (B) is a diagram showing, as data, an image of the material fabric after the creation of the second correction data. FIGS. 4A and 4B are diagrams illustrating a process of creating third and fourth correction data, where FIG. 5A is a diagram illustrating a pattern frame, and FIG. 5B is a material fabric after the creation of the first and second correction data. (C) is a diagram showing, as data, an image of the material fabric after the creation of the third correction data. . The process of creating the third and fourth correction data has been described, and (A) is a diagram showing the image of the material fabric after the creation of the third correction data as the data (substantially the same as FIG. 7C). (B) is a diagram showing, as data, an image of the material fabric after the fourth correction data is created. It is the flowchart which showed an example of the cloth cutting method which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 thru | or FIG. 9 has shown one Embodiment of the fabric cutting apparatus 1 which concerns on this invention.
[Material fabric]
In the present invention, the material fabric W to be cut is not limited in its material, thickness, or the like, and may be a natural material or a synthetic fiber material, and may include a nonwoven fabric or the like depending on circumstances. The material dough W may be a flat dough that has been roughly cut into a predetermined size in advance, or a belt-like dough unwound from a roll wound body.

  However, as shown in FIG. 2A, it is assumed that the material dough W is provided with a pattern H correlated with the dough parts to be cut out. That is, the present invention is premised on cutting the fabric part so as to match or follow the contour of the pattern H, or cutting the pattern H so as to be taken into the fabric part in a predetermined arrangement. In addition, it is assumed that at least four point marks (first point mark P1, second point mark P2, third point mark P3, and fourth point mark P4) are displayed on the material fabric W.

Further, in the present embodiment, an intermediate mark 65 is displayed between the first point mark P1 and the second point mark P2, and an intermediate mark 66 is displayed between the third point mark P3 and the fourth point mark P4. It is as a thing. These intermediate marks 65 and 66 will not be described here but will be described later.
The handle H is provided with a positional relationship with respect to the contour of the material fabric W. The first to fourth point marks P1 to P4 are also displayed with a positional relationship with respect to the contour of the material cloth W.

  Here, the outline of the material dough W means, for example, both ends of the band width in the case of a belt-like cloth unwound from a roll wound body. Even when the material fabric W is a flat fabric, when the pattern H is applied or when the first to fourth point marks P1 to P4 are displayed, the material fabric W has a linear fabric edge (outline) as a larger fabric. The arrangement of the handle H and the first to fourth point marks P1 to P4 is determined based on the fabric edge.

  In other words, even if an indirect positional relationship occurs between the arrangement of the handle H and the arrangement of the first to fourth point marks P1 to P4, a direct and unambiguous positional relationship (correlation). ) Is not provided. Therefore, for example, even if the pattern H is changed in the material fabric W, the arrangement of the first to fourth point marks P1 to P4 with respect to the material fabric W can be kept constant (invariable).

For this reason, the application of the handle H and the display of the first to fourth point marks P1 to P4 may be performed simultaneously or not simultaneously (even if shifted in time). Good.
Further, the first to fourth point marks P1 to P4 may be provided by printing or the like, or other methods (for example, making the knitted structure of the material fabric W itself partially different, providing unevenness or holes, Alternatively, it may be displayed by a method of attaching an adherent such as an adhesive or a seal.

As an example, the first to fourth point marks P1 to P4 are displayed using a fluorescent paint that can be visually recognized or detected only when irradiated with black light (ultraviolet rays) so that the pattern H is not adversely affected visually. May be. In this case, even if the first to fourth point marks P1 to P4 may interfere with the pattern H in position, there is no problem.
[Point mark position]
As will be described later, the first to fourth point marks P1 to P4 are the four corners of a rectangular (including square) pattern frame 30 (see FIG. 2B) that is input to the correction processing unit 21 of the fabric cutting apparatus 1. It corresponds to.

  The pattern frame 30 is set so as to surround the arrangement area of the fabric parts to be cut. Here, the “fabric part arrangement area” has almost the same meaning as the distribution area of the pattern H attached to the material cloth W (designed while ignoring expansion and contraction etc.), but the pattern on the material cloth W This is not the positional information (coordinates) of H but an outer frame that can accommodate the spread (layout area) in which the pattern H is distributed.

The arrangement of the first to fourth point marks P1 to P4 is approximately as follows.
That is, the first point mark P1 is arranged in the vicinity of the fabric edge on one side of the material fabric W. There is no numerical limit on how close to the end of the fabric. Further, as described above, the relative positional relationship with the handle H is not particularly limited. In some cases, it may be a part of the handle H.

The second point mark P2 is arranged away from the first point mark P1 in the side direction. The numerical positional relationship with the fabric edge and the relative positional relationship with the handle H are the same as in the case of the first point mark P1.
The third point mark P3 is arranged in the vicinity of the fabric end that is opposite to the first point mark P1. The numerical positional relationship with the fabric edge and the relative positional relationship with the handle H are the same as in the case of the first point mark P1.

The fourth point mark P4 is spaced apart from the third point mark in the side direction, and is arranged in a positional relationship on the opposite side with respect to the second point mark. The numerical positional relationship with the fabric edge and the relative positional relationship with the handle H are the same as in the case of the first point mark P1.
[Basic equipment configuration of fabric cutting equipment]
As shown in FIG. 1, the dough cutting apparatus 1 includes a cutting table 2 that supports the material dough W in an unfolded state, and a cutting that is provided above the cutting table 2 and cuts the material dough W on the cutting table 2. It has a head 3 and a head moving mechanism 4 that moves the cutting head 3 up and down, horizontally swivels, and horizontally moves.

  The cutting table 2 shows what was formed as the upper part 6a of the belt conveyor 6. FIG. The belt conveyor 6 is configured to allow an endless belt having air permeability to run continuously or intermittently in one direction by a belt driving unit 7. For this reason, the material dough W can be carried into and out of the cutting position with high efficiency. In addition, it is good to stop the belt conveyor 6 during cutting.

The belt conveyor 6 is provided with a suction head 8 below the upper portion 6a (the cutting table 2).
The suction head 8 is connected to an appropriate suction device 10 such as a vacuum generator or a blower via a flexible hose 9, and cuts the material dough W by sucking air on the cutting table 2 downward on the table surface. Adsorb and hold on the table 2. As a result, the material dough W can be easily and reliably cut by the cutting head 3.

The cutting head 3 is configured such that a rotary blade 12 such as a round blade is driven to rotate about a horizontal axis.
The head moving mechanism 4 includes a feed unit 13 that horizontally moves the cutting head 3 by appropriately combining a feed direction of the belt conveyor 6 and a direction perpendicular to the feed direction in a horizontal plane, and the rotary blade 12 in the moving direction by the feed unit 13. A swivel unit 14 that horizontally turns the cutting head 3 so as to match the cutting edge, and an elevation that moves the cutting head 3 up and down between a height at which the lower end of the rotary blade 12 contacts the material cloth W on the cutting table 2 and above. Part 15.

  The horizontal movement mechanism of the feeding unit 13, the horizontal turning mechanism of the turning unit 14, and the lifting mechanism of the raising / lowering unit 15 may all be configured by a winding screw mechanism, a feed screw mechanism using a ball screw, or the like. Further, as a drive source for driving each of these mechanisms, a position-controllable motor such as a stepping motor or a servo motor is used. These detailed structures and the like are not limited at all.

The suction head 8 is formed in a compact size that sucks only the area corresponding to the lower part of the cutting head 3 (rotating blade 12), and is integrated with the cutting head 3 at the upper and lower portions sandwiching the cutting table 2. The suction part moving mechanism 16 is provided so as to move horizontally.
[Control configuration of fabric cutting device]
The fabric cutting device 1 includes a detection device 20, a correction processing unit 21, and an operation control unit 22 as its control configuration (see FIG. 4).

  The detection device 20 detects the first to fourth point marks P1 to P4 displayed on the material fabric W from the material fabric W spread on the cutting table 2 by an image matching method (with a previously stored image). This is detected by a matching method (determination method for reading out as related predetermined coordinates (image center point or the like)) (intermediate marks 55, 56, 65, 66 described later can also be detected). The detection device 20 is configured by, for example, a camera equipped with a CCD image sensor.

In addition, this detection apparatus 20 can be provided in the cutting head 3 so that it can move with the cutting head 3 (rotary blade 12), for example. In addition, it is also possible to provide a frame so as to straddle the belt conveyor 6 and fix the detection device 20 to the frame.
The correction processing unit 21 and the operation control unit 22 are configured as a computer that outputs an operation program, a correction signal, and the like to the head moving mechanism 4 for moving the cutting head 3.

  Of these, the correction processing unit 21 first divides the material fabric W into a plurality of sections. For example, when it is assumed that the material dough W is a rectangle whose longitudinal direction is directed to the conveying direction of the belt conveyor 6, the short side can be divided into two halves divided into two sections. The long side is divided into two sections having a half area formed by dividing the long side into two equal parts. A specific division method will be described later.

And the expansion-contraction rate of the raw material cloth W is calculated | required for every these division. A specific method for obtaining the expansion / contraction rate will be described later. Based on the expansion / contraction rate, correction data corresponding to the positional deviation of the pattern H and the deformation of the pattern H is created for each section.
On the other hand, the operation control unit 22 controls the head moving mechanism 4 based on the cutting correction data created by the correction processing unit 21.
[Dough cutting method]
Next, the fabric cutting method according to the present invention will be described based on the operation status of the fabric cutting device 1 having the above-described configuration.
[Preparation]
Now, as shown in FIG. 1, it is assumed that the material dough W is fed onto the cutting table 2 by the operation of the belt conveyor 6 or the like and spread to a predetermined cutting position.

In addition, when the material dough W is a strip-like dough unwound from the roll wound body, it is preferable to roughly cut the material dough W every predetermined length (distribution region of the pattern H forming a group) in the conveying direction of the belt conveyor 6. The rough cutting in this case may be performed by horizontally moving the cutting head 3 in the width direction of the belt conveyor 6.
As shown in FIG. 2A, the material dough W spread on the cutting table 2 is provided with a pattern H, and the first to fourth point marks P1 to P4 are displayed in a predetermined arrangement in advance. It is assumed that

As shown in FIG. 2B, the correction processing unit 21 of the cloth cutting device 1 includes a pattern frame 30 that encloses the arrangement area of the cloth parts to be cut with a rectangle, and an ideal in the pattern frame 30. And a master pattern for instructing the pattern arrangement.
In the present embodiment, the pattern frame 30 has a pair of long side edges 31 and 32 along the conveying direction of the belt conveyor 6 and a pair of short side edges 33 and 34 that are orthogonal to each other in a plane. The case is shown. The four corners (intersections of the edges 31 to 34) of the pattern frame 30 correspond directly or indirectly to the first to fourth point marks P1 to P4 of the material fabric W, respectively.

The pattern frame 30 may be displayed as a computer screen 45, for example. Further, the master pattern 46 may be displayed on the inside of the pattern frame 30 on the computer screen 45. Such a computer screen 45 (pattern frame 30 and master pattern 46) is not necessarily required and may be omitted.
First, the fabric cutting device 1 operates the detection device 20 above the cutting table 2 to detect the first to fourth point marks P1 to P4 from the material fabric W spread on the cutting table 2. This detection is performed by moving the detection device 20 upward one after another from the first to fourth point marks P1 to P4.

  In addition, these 1st-4th point marks P1-P4 are the arrangement | positioning linked | related with respect to the raw material cloth W as mentioned above, and are made into the positional relationship corresponding to each of the four corners of the pattern frame 30 directly or indirectly. Therefore, from the input information of the pattern frame 30, it is possible to predict the approximate vicinity (periphery of each point) with respect to the first to fourth point marks P1 to P4.

Therefore, by controlling the head moving mechanism 4 by the operation control unit 22, the cutting head 3 (supporting the detection device 20) is quickly moved straight above each of the first to fourth point marks P1 to P4, And the detection by the detection apparatus 20 can be performed rapidly.
After these preparations are completed, the correction processing unit 21 divides the material dough W into a plurality of sections and creates correction data according to each section. In the present embodiment, it is assumed that the division of the material cloth W into two sections is performed in two directions, vertically and horizontally, and four correction data on the top, bottom, left and right are created. In the following, description will be given in order.
[Preparation to create upper and lower correction data]
As shown in FIG. 3, the correction processing unit 21 uses both the first point mark P1 and the second point mark P2 from the first to fourth point marks P1 to P4 detected by the detection device 20, and both these marks. A 1-2 system straight line 51 parallel to a virtual line 50 connecting P1 and P2 is set.

The 1-2 system straight line 51 may be the same line as the imaginary line 50 connecting the first and second marks P1 and P2, but in the present embodiment, a predetermined dimension (15 mm or 25 mm) is provided on the outside thereof. ) Was set as the position. The 1-2 system straight line 51 directly corresponds to the edge 31 of the pattern frame 30.
Similarly, the correction processing unit 21 sets the 3-4 system straight line 53 parallel to the virtual line 52 connecting the marks P3 and P4 by the third point mark P3 and the fourth point mark P4.

In the present embodiment, the 3-4 system straight line 53 is set as a position where a predetermined dimension (15 mm or 25 mm) is placed outside the virtual line 52 connecting the third and fourth marks P3 and P4. This 3-4 system straight line 53 directly corresponds to the edge 32 of the pattern frame 30.
Further, an intermediate mark 55 existing between the first point mark P1 and the third point mark P3 and an intermediate mark 56 existing between the second point mark P2 and the fourth point mark P4 are detected.

The intermediate marks 55 and 56 are detected by moving the cutting head 3 (detection device 20) upward between the first point mark P1 and the third point mark P3 by the control of the head moving mechanism 4 by the operation control unit 22. Or by moving the second point mark P2 and the fourth point mark P4 upward from each other.
The intermediate marks 55 and 56 may be displayed as dedicated marks for the material cloth W. However, if there is a characteristic expression part in the pattern H, one point is selected from the expression part. Extract it and use it.

In the present embodiment, the corners of the handle H are arranged symmetrically around the middle between the first point mark P1 and the third point mark P3 and near the middle between the second point mark P2 and the fourth point mark P4. Since these portions exist, these corner portions are used as intermediate marks 55 and 56.
Then, these two intermediate marks 55 and 56 are connected, and this is set as an intermediate dividing line 57 for dividing the 1-2 system straight line 51 and the 3-4 system straight line 53.

When setting the 1-2 system straight line 51, the 3-4 system straight line 53, and the intermediate dividing line 57, it is not necessary to perform troublesome calculations such as the least square method. Therefore, it is possible to speed up the setting of these lines.
In addition, since the 1-2 system straight line 51, the 3-4 system straight line 53, and the middle division line 57 are set in the direction along the conveyance direction of the belt conveyor 6 forming the cutting table 2, the following In the description, the line direction of each of these lines 51, 53, and 57 is set to “horizontal” for convenience.

By the way, when it is assumed that there is no expansion / contraction or the like in the material fabric W, the arrangement where the 1-2 system straight line 51 and the 3-4 system straight line 53 should be originally is in the design regarding the first to fourth point marks P1 to P4. Can be obtained from the given data (arrangement coordinates of the first to fourth point marks P1 to P4 with respect to the material fabric W).
On the other hand, the arrangement in which the middle division line 57 should originally be located with respect to the material cloth W can be obtained from design pattern data (the arrangement of the pattern H with respect to the material cloth W and the coordinates indicating the contour thereof). As a result, an ideal distance between the 1-2 system straight line 51 and the intermediate dividing line 57 and an ideal distance between the 3-4 system straight line 53 and the intermediate dividing line 57 can be obtained.

Accordingly, as shown in FIG. 5A, the correction processing unit 21 has a pattern corresponding to the ideal interval between the 1-2 system straight line 51 and the intermediate dividing line 57 among the mutual intervals of the edges 31 and 32 in the pattern frame 30. The division value A0 can be known, and similarly, the pattern division value B0 corresponding to the ideal interval between the 3-4 system straight line 53 and the intermediate division line 57 can be known.
For example, assume that A0: B0 = 51: 49. Since the pattern frame 30 is rectangular, the edges 31 and 32 are parallel, and therefore the pattern division values A0 and B0 are constant in the line direction of the edges 31 and 32.
[Lower correction data creation]
The correction processing unit 21 creates the following correction data for the material fabric W toward the section below the horizontal intermediate dividing line 57 shown in FIG.

That is, the correction processing unit 21 actually measures the mutual interval A between the 1-2 system straight line 51 and the intermediate dividing line 57 in the material fabric W, as shown in FIG. Since the 1-2 system straight line 51 and the intermediate dividing line 57 are not necessarily parallel to each other, this actual measurement is repeated for a large number of points along the line direction of the 1-2 system straight line 51 to obtain a large number of actually measured values. Shall.
Next, the correction processing unit 21 compares the mutual distance A on the 1-2 system straight line 51 side in the material fabric W with the pattern division value A0 on the edge 31 side in the pattern frame 30. As described above, while the pattern division value A0 is constant, there are a large number of actually measured values along the line direction of the 1-2 system line 51 in the mutual distance A on the 1-2 system line 51 side. The comparison between the mutual interval A and the pattern division value A0 is performed over the entire length of the 1-2 system straight line 51.

By this comparison, a large number of 1-2 system expansion / contraction ratios α (αn = An / A0 at an arbitrary point n on the 1-2 system line 51) along the line direction of the 1-2 system line 51 are obtained.
Then, next, as shown in FIG. 5C, the correction processing unit 21 performs the above-described pattern HA included in the section sandwiched between the 1-2 system straight line 51 and the intermediate dividing line 57 in the material fabric W. The contour coordinates in the master pattern are corrected with the 1-2 system expansion / contraction rate α.

  For example, as shown in FIG. 5B, regarding the pattern HA corresponding to the arbitrary point n described above, if one point in the master pattern is set to (Xa, Ya), this coordinate is converted to the 1-2 system expansion / contraction. By correcting with the rate αn, it can be obtained as (Xa × An / A0, Ya × An / A0) as shown in FIG. This operation is performed over the entire length of the 1-2 system straight line 51 to obtain correction data for cutting the pattern HA (see the area indicated by hatching in FIG. 5C).

  Here, “correction data for cutting pattern HA” may be coordinates indicating the contour of the pattern HA if the cloth part to be cut out and the pattern HA have the same shape, or the cloth part and the pattern HA. Are similar to each other, the coordinates may be coordinates indicating an outline in which a predetermined margin is added to the outer side or the inner side of the pattern HA. Alternatively, in the case where the pattern HA is taken into a predetermined arrangement within the fabric part, the contour coordinates on the fabric part side with their correlation may be used.

For reference, in many cases, the coordinates indicate an outline with a margin added outside or inside the outline of the pattern HA. Naturally, if a cutout (hole) is required in the handle HA, coordinates indicating the outline of the cutout portion or coordinates indicating a line with a predetermined margin added inside or outside the outline are also included. You just have to ask for it.
[Create upper correction data]
The correction processing unit 21 performs the same procedure as that described above also on the material fabric W toward the section above the horizontal intermediate dividing line 57 shown in FIG. 3, and creates the following correction data.

That is, as illustrated in FIG. 6A, the correction processing unit 21 actually measures the mutual interval B between the 3-4 system straight line 53 and the intermediate dividing line 57 in the material fabric W. Since the 3-4 system straight line 53 and the intermediate dividing line 57 are not necessarily parallel to each other, this measurement is repeatedly performed on a large number of points along the line direction of the 3-4 system straight line 53 to obtain a large number of actually measured values. Shall.
Next, the correction processing unit 21 compares the mutual distance B on the 3-4 system straight line 53 side in the material fabric W with the pattern division value B0 (see FIG. 5A) on the edge 32 side in the pattern frame 30. As described above, while the pattern division value B0 is constant, there are a large number of actually measured values along the line direction of the 3-4 system line 53 in the mutual interval B on the 3-4 system line 53 side. The comparison between the mutual interval B and the pattern division value B0 is performed over the entire length of the 3-4 system straight line 53.

By this comparison, a large number of 3-4 system expansion / contraction ratios β (βn = Bn / B0 at an arbitrary point n on the 3-4 system line 53) along the line direction of the 3-4 system line 53 are obtained.
Therefore, the correction processing unit 21 next applies the pattern HB included in the section sandwiched between the 3-4 system straight line 53 and the intermediate dividing line 57 in the material fabric W as shown in FIG. The contour coordinates in the master pattern are corrected with the 3-4 system expansion / contraction ratio β.

  For example, as shown in FIG. 6 (A), regarding the handle HB corresponding to the arbitrary point n described above, if one point in the master pattern is set to (Xb, Yb), this coordinate is converted to the 3-4 system expansion / contraction. By correcting with the rate βn, it can be obtained as (Xb × Bn / B0, Yb × Bn / B0) as shown in FIG. This operation is performed over the entire length of the 3-4 system line 53 to obtain correction data for cutting the pattern HB (see the newly hatched area in FIG. 6B).

  Here, “correction data for cutting pattern HB” may be coordinates indicating the contour of the pattern HB itself if the fabric part to be cut out and the pattern HB have the same shape, or the fabric part and the pattern HB. Are similar to each other, the coordinates may indicate the outline of the pattern HB with a predetermined margin added outside or inside the outline. Alternatively, in the case where the pattern HB is taken into a predetermined arrangement within the fabric part, the contour coordinates on the fabric part side with their correlation may be used.

For reference, in many cases, the coordinates indicate an outline with a margin added to the outside or inside of the outline of the handle HB. Of course, if a cutout (hole) is required in the handle HB, coordinates indicating the outline of the cutout portion or coordinates indicating a line with a predetermined margin added inside or outside the outline are also included. You just have to ask for it.
[Preparation to create left and right correction data]
As shown in FIG. 3, the correction processing unit 21 uses the first point mark P1 and the third point mark P3 from the first to fourth point marks P1 to P4 detected by the detection device 20, and both of these marks. A 1-3 system straight line 61 parallel to a virtual line 60 connecting P1 and P3 is set.

The 1-3 system straight line 61 may be the same line as the virtual line 60 connecting the first and third marks P1 and P3, but in the present embodiment, a predetermined dimension (15 mm or 25 mm) is provided on the outside thereof. ) Was set as the position. The 1-3 system straight line 61 directly corresponds to the edge 33 of the pattern frame 30.
Similarly, the correction processing unit 21 sets a 2-4 system straight line 63 parallel to a virtual line 62 connecting these marks P2 and P4 by using the second point mark P2 and the fourth point mark P4.

In the present embodiment, the 2-4 system straight line 63 is set as a position where a predetermined dimension (15 mm or 25 mm) is placed outside the virtual line 62 connecting both the second and fourth marks P2, P4. This 2-4 system straight line 63 directly corresponds to the edge 34 of the pattern frame 30.
Further, an intermediate mark 65 existing between the first point mark P1 and the second point mark P2 and an intermediate mark 66 existing between the third point mark P3 and the fourth point mark P4 are detected.

The intermediate marks 65 and 66 are detected by moving the cutting head 3 (detector 20) upward between the first point mark P1 and the second point mark P2 by the control of the head moving mechanism 4 by the operation control unit 22. Or by moving the third point mark P3 and the fourth point mark P4 upward from each other.
The intermediate marks 65 and 66 may be displayed as dedicated marks for the material fabric W. However, if there is a characteristic expression part in the pattern H, one point is selected from the expression part. Extract it and use it.

In the present embodiment, dedicated marks as intermediate marks 65 and 66 are displayed. The display of the dedicated mark may be performed simultaneously with the display of the first to fourth point marks P1 to P4, or may be performed simultaneously with the application of the pattern H. The display method is not particularly limited.
Then, these two intermediate marks 65 and 66 are connected and set as an intermediate dividing line 67 for dividing the 1-3 system straight line 61 and the 2-4 system straight line 63 from each other.

When setting the 1-3 system straight line 61, the 4-4 system straight line 63, and the intermediate dividing line 67, it is not necessary to perform troublesome calculations such as the least square method. Therefore, it is possible to speed up the setting of these lines.
Since the 1-3 system straight line 61, the 2-4 system straight line 63 and the intermediate partition line 67 are set in a direction orthogonal to the conveying direction of the belt conveyor 6 forming the cutting table 2, In the following description, the line direction of each of the lines 61, 63, 67 is referred to as “vertical direction” for convenience.

By the way, when it is assumed that there is no expansion / contraction or the like in the material fabric W, the arrangement in which the 1-3 system straight line 61 and the 2-4 system straight line 63 should be originally is in the design regarding the first to fourth point marks P1 to P4. Can be obtained from the given data (arrangement coordinates of the first to fourth point marks P1 to P4 with respect to the material fabric W).
On the other hand, the arrangement in which the intermediate dividing line 67 should originally be located with respect to the material cloth W can be obtained from design pattern data (the arrangement of the pattern H with respect to the material cloth W and the coordinates indicating the contour thereof). As a result, an ideal distance between the 1-3 system straight line 61 and the intermediate dividing line 67 and an ideal distance between the 2-4 system straight line 63 and the intermediate dividing line 67 can be obtained.

Accordingly, as shown in FIG. 7A, the correction processing unit 21 has a pattern corresponding to the ideal interval between the 1-3 system straight line 61 and the intermediate dividing line 67 among the mutual intervals of the edges 33 and 34 in the pattern frame 30. The division value C0 can be known, and similarly, the pattern division value D0 corresponding to the ideal interval between the 2-4 system straight line 63 and the intermediate division line 67 can be known.
For example, assume that C0: D0 = 50: 50. Since the pattern frame 30 is rectangular, the edges 33 and 34 are parallel, and therefore the pattern division values C0 and D0 are constant in the line direction of the edges 33 and 34.
[Left side correction data creation]
The correction processing unit 21 creates the following correction data for the material fabric W toward the section on the left side of the vertically oriented intermediate section line 67 shown in FIG.

That is, the correction processing unit 21 actually measures the mutual interval C between the 1-3 system straight line 61 and the intermediate dividing line 67 in the material fabric W as shown in FIG. Since the 1-3 system straight line 61 and the intermediate dividing line 67 are not necessarily parallel to each other, this measurement is repeatedly performed on a large number of points along the line direction of the 1-3 system straight line 61 to obtain a large number of actually measured values. Shall.
Next, the correction processing unit 21 compares the mutual distance C on the 1-3 system straight line 61 side in the material fabric W with the pattern division value C0 on the edge 33 side in the pattern frame 30. As described above, while the pattern division value C0 is constant, there are a large number of actually measured values along the line direction of the 1-3 system line 61 in the mutual interval C on the 1-3 system line 61 side. The comparison between the mutual interval C and the pattern division value C0 is performed over the entire length of the 1-3 system straight line 61.

By this comparison, a number of 1-3 system expansion / contraction ratios γ along the line direction of the 1-3 system straight line 61 (γm = Cm / C0 at an arbitrary point m on the 1-3 system straight line 61) are obtained.
Therefore, the correction processing unit 21 next applies the pattern HC included in the section sandwiched between the 1-3 system straight line 61 and the intermediate dividing line 67 in the material fabric W as shown in FIG. The contour coordinates in the master pattern are corrected with the 1-3 system expansion / contraction rate γ.

  For example, as shown in FIG. 7B, with respect to the handle HC corresponding to the arbitrary point m described above, if one point in the master pattern is set to (Xc, Yc), this coordinate is converted to the 1-3 system expansion / contraction. By correcting with the rate γm, it can be obtained as (Xc × Cm / C0, Yc × Cm / C0) as shown in FIG. This operation is performed over the entire length of the 1-3 system straight line 61 to obtain correction data for cutting the pattern HC (see the hatched area in FIG. 7C).

  Here, the “correction data for cutting the pattern HC” may be coordinates indicating the contour of the pattern HC itself if the cloth part to be cut out and the pattern HC have the same shape, or the cloth part and the pattern HC. Are similar to each other, the coordinates may indicate the outline of the pattern HC with a predetermined margin added outside or inside the contour. Alternatively, in the case where the pattern HC is taken into a predetermined arrangement within the fabric part, the contour coordinates on the fabric part side with the correlation between them may be used.

For reference, in many cases, the coordinates indicate an outline with a margin added outside or inside the contour of the handle HC. Naturally, if a cutout (hole) is required in the handle HC, a coordinate indicating the outline of the cutout portion or a coordinate indicating a line with a predetermined margin added inside or outside the outline is obtained. What should I do?
[Create correction data on the right]
The correction processing unit 21 performs a procedure similar to the above-described procedure also for the material fabric W toward the right section from the vertical intermediate dividing line 67 shown in FIG. 3, and creates the following correction data. .

That is, the correction processing unit 21 actually measures the mutual interval D between the 2-4 system straight line 63 and the intermediate dividing line 67 in the material fabric W, as shown in FIG. Since the 2-4 system straight line 63 and the intermediate dividing line 67 are not necessarily parallel to each other, this actual measurement is repeated for a large number of points along the line direction of the 2-4 system straight line 63 to obtain a large number of actual measurement values. Shall.
Next, the correction processing unit 21 compares the mutual distance D on the 2-4 system straight line 63 side in the material fabric W with the pattern division value D0 (see FIG. 7A) on the edge 34 side in the pattern frame 30. As described above, while the pattern division value D0 is constant, there are many actual measurement values along the line direction of the 2-4 system straight line 63 in the mutual interval D on the 2-4 system straight line 63 side. The comparison between the mutual distance D and the pattern division value D0 is performed over the entire length of the 2-4 system straight line 63.

By this comparison, a number of 2-4 system expansion / contraction ratios δ along the line direction of the 2-4 system straight line 63 (δm = Dm / D0 at an arbitrary point m on the 2-4 system straight line 63) are obtained.
Therefore, the correction processing unit 21 next processes the pattern HD included in the section sandwiched between the 2-4 system straight line 63 and the intermediate dividing line 67 in the material fabric W as shown in FIG. The contour coordinates in the master pattern are corrected with the 2-4 system expansion / contraction ratio δ.

  For example, as shown in FIG. 8A, if one point in the master pattern is set to (Xd, Yd) for the pattern HD corresponding to the above-mentioned arbitrary point m, this coordinate is converted to the 2-4 system expansion / contraction. By correcting with the rate γm, it can be obtained as (Xd × Dm / D0, Yd × Dm / D0) as shown in FIG. This operation is performed over the entire length of the 2-4 system straight line 63 to obtain correction data for cutting pattern HD (see the newly hatched area in FIG. 8B).

  Here, the “pattern HD cutting correction data” may be coordinates indicating the outline of the pattern HD itself if the fabric part to be cut out and the pattern HD have the same shape, or the fabric part and the pattern HD. Are similar to each other, the coordinates may indicate the outline of the pattern HD with a predetermined margin added outside or inside the outline of the pattern HD. Alternatively, in the case where the pattern HD is taken into a predetermined arrangement within the fabric part, the contour coordinates on the fabric part side with their correlation may be used.

For reference, in many cases, the coordinates indicate an outline with a margin added outside or inside the outline of the pattern HD. Naturally, if a cutout (hole) is required in the pattern HD, coordinates indicating the outline of the cutout portion or coordinates indicating a line with a predetermined margin added inside or outside the outline are also included. You just have to ask for it.
[Cutting]
The correction processing unit 21 obtains four pieces of correction data for upper, lower, left, and right obtained as described above, that is, 1-2 system cutting correction data (lower correction data), and 3-4 system cutting data. Correction data (upper correction data), 2-4 system cutting correction data (left correction data), and 1-3 system cutting correction data (right correction data) are summarized into one correction data ( Cutting data) to the operation control unit 22.

As a result, the operation control unit 22 controls the head moving mechanism 4 based on the correction data from the correction processing unit 21 to move the cutting head 3 (moving up / down, turning horizontally, moving horizontally). Thus, the material cloth W is cut according to the expansion and contraction.
During the cutting by the cutting head 3, the suction head 8 is also moved horizontally together with the cutting head 3, and the material dough W is sucked directly under the cutting table 2, so that the material dough W does not move. Retained and reliable and clean cutting is performed.

The dough parts cut out by cutting are then stacked by a stacking device or the like installed on the downstream side of the conveyance by the operation of the belt conveyor 6 or the like.
[flowchart]
FIG. 9 is a flowchart showing an example of the dough cutting method according to the present invention. The cloth cutting method according to the present invention will be described with reference to FIG.

First, confirmation that the material fabric W has been carried onto the cutting table 2 (steps 100 to 101) and input of the pattern frame 30 and the master pattern to the correction processing unit 21 (step 102) are performed.
In this state, the point mark P1 to P4 and the intermediate marks 55, 56, 65, and 66 of the material fabric W are detected while moving the detection device 20 (steps 103 to 105).

In addition, when the raw material cloth W is a belt-shaped cloth unwound from a roll wound body, a rough cutting position in the unwinding direction (a group as a distribution area of the pattern H using the detected point marks P1 to P4). ) Is found and roughly cut by the cutting head 3 (step 106).
Further, the 1-2 system straight line 51, the 3-4 system straight line 53, the 1-3 system straight line 61, the 2-4 system straight line 63 are obtained according to the point marks P1 to P4 (step 107).

Further, intermediate dividing lines 57 and 67 are obtained from the intermediate marks 55, 56, 65 and 66 (step 108). With these intermediate dividing lines 57 and 67, the material cloth W is divided into two upper and lower sections sandwiching the horizontal intermediate dividing line 57, or divided into two left and right sections sandwiching the vertical intermediate dividing line 67. You will be able to.
Next, using the horizontal 1-2 system straight line 51, 3-4 system straight line 53, and middle section line 57, the individual expansion ratios of the upper and lower two sections (1-2 system expansion ratio α and 3-4 system expansion / contraction) The rate β) is obtained (step 109).

Further, by using the vertical 1-3 straight line 61, the 2-4 system straight line 63 and the middle division line 67, the left and right two sections have individual stretch rates (1-3 system stretch rate γ and 2-4 system stretch rate). δ) is obtained (step 110).
And based on each expansion ratio (1-2 system expansion ratio α, 3-4 system expansion ratio β) of the upper and lower two sections, for cutting according to the positional deviation and deformation of the pattern (HA, HB) for each section The correction data for the left and right compartments (1-3 system expansion ratio γ and 2-4 system expansion ratio δ) and the positional deviation of the pattern (HC, HD) and Correction data for cutting according to the deformation is created (steps 111 to 112).

Next, the material cloth W is cut based on the obtained correction data (steps 113 to 114).
Finally, the cut dough parts and cutout baskets are unloaded from the cutting table 2, and the dough parts are stacked or otherwise collected at an appropriate position on the downstream side of the cutout. Recovery may be performed (steps 115 to 116).
[Summary]
As is apparent from the above description, the fabric cutting device and the fabric cutting method according to the present invention simultaneously correct positional deviation and deformation (enlargement / reduction and distortion) of the pattern H itself.

  Moreover, in the cloth cutting apparatus and the cloth cutting method according to the present invention, dividing the material cloth W into a plurality of sections (two sections in the embodiment) is performed in a vertical and horizontal manner. Correction data (four in the above embodiment) is created. For this reason, correction data (cut data) having a predetermined correlation with the pattern H can be obtained even when the accuracy of the correction is high and the positional deviation or deformation of the pattern H itself is considerably large.

For these reasons, the material fabric W is a flat fabric in which the four sides are roughly cut by hand, a belt-like fabric unwound from a roll wound body, and the pattern corresponding to the fabric part to be cut out. Even when is attached, the fabric parts can be cut with a predetermined correlation with the pattern H without being affected by the positional deviation or deformation of the pattern H caused by the expansion and contraction of the material fabric W.
Furthermore, in the material dough W, the arrangement of the pattern H and the arrangement of the first to fourth point marks P1 to P4 do not provide a direct and unambiguous positional relationship (correlation). Even if is changed, the arrangement of the first to fourth point marks P <b> 1 to P <b> 4 with respect to the material fabric W can be kept constant (invariable). Naturally, the dough cutting method according to the present invention can be carried out as it is. Therefore, there exists an advantage that it can respond flexibly to the change of the handle H or the like.

Further, since the first to fourth point marks P1 to P4 are arranged in association with the material cloth W, the detection of the first to fourth point marks P1 to P4 and the middle division lines 57 and 67 are obtained. Therefore, the detection of the intermediate marks 55, 56, 65, and 66 (movement of the detection device 20) can be performed quickly.
In particular, a 1-2 system straight line 51, a 3-4 system straight line 53, and an intermediate dividing line 57 are set, and a 1-3 system straight line 61, a 2-4 system straight line 63, and an intermediate dividing line 67 are set. Therefore, since it is not necessary to perform troublesome calculations such as the least square method, these settings can be performed quickly.

As these individual actions and the action as a whole, there is an advantage that the cutting operation can be executed with extremely high efficiency.
[Others]

The present invention is not limited to the above embodiment.
For example, the cutting head 3 can employ not only the rotary blade 12 but also a notch blade that moves up and down at high speed.
The cutting table 2 can be formed not by the belt conveyor 6 but by a fixed plate.

The cloth cutting device 1 and the cloth cutting method according to the present invention can be applied to the case where the material cloth W is cut with a standard length in addition to the case where the cloth parts having various shapes are cut out from the material cloth W.
The material cloth W is not limited to being divided into upper, lower, left and right sections. For example, it is possible to divide three or more sections in the vertical direction, or to divide three or more sections in the left-right direction.

DESCRIPTION OF SYMBOLS 1 Material cutting apparatus 2 Cutting table 3 Cutting head 4 Head moving mechanism 20 Detection apparatus 21 Correction processing part 22 Operation control part 30 Pattern frame 31, 32, 33, 34 Edge 50 Virtual line 51 Straight line parallel to the virtual line (1-2 System line)
52 Virtual line 53 A straight line parallel to the virtual line (3-4 system straight line)
55, 56, 65, 66 Intermediate mark 57, 67 Middle section line 61 Straight line parallel to virtual line (1-3 system straight line)
63 Straight line parallel to virtual line (2-4 system straight line)
An, Bn, Cm, Dm Mutual spacing A0, B0, C0, D0 Pattern division value H (HA, HB, HC, HD) Pattern P1-P4 First to fourth point marks W Material fabric α 1-2 system expansion / contraction Rate β 3-4 system expansion ratio γ 1-3 system expansion ratio δ 2-4 system expansion ratio

Claims (7)

In a cutting apparatus for cutting a material fabric (W) with a pattern (H) on which a plurality of point marks (P1 to P4) as a guide when dividing into a plurality of sections are correlated with the pattern (H),
A cutting table (2) for supporting the material fabric (W) in an unfolded state;
A cutting head (3) provided above the cutting table (2) for cutting the material cloth (W) on the cutting table (2);
A head moving mechanism (4) for moving the cutting head (3) up and down, horizontally turning and horizontally;
A detection device (20) for detecting each point mark (P1 to P4) from the material fabric (W) on the cutting table (2);
An imaginary line (50) obtained by dividing the material fabric (W) into a plurality of sections and connecting the point marks (P1, P2) (P3, P4) detected by the detection device (20). 52) or a straight line (51) (53) parallel thereto, the stretch rate (α) (β) of the material fabric (W) is obtained for each section and based on the stretch rate (α) (β). A correction processing unit (21) for generating correction data corresponding to the positional deviation of the pattern (HA) (HB) and the deformation of the pattern (HA) (HB) for each section;
A fabric cutting apparatus comprising: an operation control unit (22) for controlling the head moving mechanism (4) based on the correction data for cutting created by the correction processing unit (21). . A plurality of point marks (P1 to P4) that are used as a guide when dividing the material fabric (W) with a pattern (H) into a plurality of sections are displayed.
Each point mark (P1 to P4) is detected from the spread material fabric (W),
Dividing the material fabric (W) into a plurality of sections,
Material cloth for each section based on virtual lines (50) (52) obtained by connecting the point marks (P1, P2) (P3, P4) to each other or straight lines (51) (53) parallel thereto. Obtain the expansion / contraction rate (α) (β) of (W),
Based on the obtained expansion / contraction rate (α) (β), for each section, create a correction data for cutting according to the positional deviation of the pattern (HA) (HB) and the deformation of the pattern (HA) (HB),
A fabric cutting method, wherein the material fabric (W) is cut based on the obtained correction data. The point marks (P1 to P4) to be displayed on the material fabric (W) are assumed to correspond to the four corners of the pattern frame (30) indicated by surrounding the distribution area of the pattern (H) with a virtual rectangle,
The stretch rate (α) (β) is determined by setting an intermediate dividing line (57) that divides between a plurality of virtual lines (50, 52) or between a plurality of straight lines (51, 53). From the numerical value (An) (Bn) obtained by actually measuring the mutual interval (A) (B) between the intermediate dividing line (57) and each line (50, 52) (51, 53) and the pattern frame (30) The cloth cutting method according to claim 2, wherein the cloth cutting method is obtained by comparison with the obtained pattern division values (A0) and (B0). With respect to the rectangular shape of the pattern frame (30), a horizontal intermediate dividing line (57) is set at a position that bisects between two opposing sides whose line direction is horizontal,
Set the vertical middle dividing line (67) at the position that bisects the two opposite sides where the line direction is vertical,
The correction is made on both the upper and lower sides across the horizontal intermediate dividing line (57), and the correction is made on both the left and right sides of the vertical intermediate dividing line (67) preceding or following the correction. Item 3. The dough cutting method according to Item 3. The distribution area of the pattern (H) is hypothesized for the cloth cutting device that cuts the cloth part by performing the cutting correlated with the pattern (H) from the material cloth (W) with the pattern (H) corresponding to the cloth part. A pattern frame (30) surrounded and indicated by the upper rectangle and a master pattern indicating an ideal pattern arrangement within the pattern frame (30) are initialized by input,
For the material fabric (W), the first to fourth point marks (P1 to P4) are displayed in correspondence with the four corners of the pattern frame (30),
The first to fourth point marks (P1 to P4) are detected in a state in which the material dough (W) is spread on a cutting table (2) provided in the dough cutting device,
A virtual line (50) connecting the first point mark (P1) and the second point mark (P2) arranged away from the first point mark (P1) in the side direction or a virtual line parallel to the virtual line (50) is represented by 1− Set as 2 system straight line (51),
A third point mark (P3) arranged on the opposite side of the first point mark (P1) and a side away from the third point mark (P3) and on the opposite side of the second point mark (P2) A virtual line (52) connecting the fourth point mark (P4) made or a virtual line parallel thereto is set as a 3-4 system straight line (53),
An intermediate mark (55) existing between the first point mark (P1) and the third point mark (P3) and an intermediate position existing between the second point mark (P2) and the fourth point mark (P4). An intermediate dividing line (57) that divides the 1-2 system straight line (51) and the 3-4 system straight line (53) by connecting the marks (56) to each other,
The intermediate dividing line (57) is an initial value that should exist between the 1-2 system straight line (51) and the 3-4 system straight line (53). In the pattern frame (30), the 1-2 system straight line ( 51) as the pattern division value (A0) from the edge (31) corresponding to 51) and the pattern division value (B0) from the edge (32) corresponding to the 3-4 system straight line (53),
The measured value of the mutual distance (A) between the 1-2 system straight line (51) and the intermediate dividing line (57) is compared with the pattern division value (A0) over the entire length of the 1-2 system straight line (51). 1-2 system expansion and contraction rate (α) is obtained,
The contour coordinates in the master pattern of the pattern (HA) included in the section sandwiched between the 1-2 system straight line (51) and the intermediate partition line (57) are corrected by the 1-2 system expansion / contraction rate (α). To obtain correction data for cutting the pattern (HA),
The measured value of the mutual interval (B) between the 3-4 system straight line (53) and the intermediate dividing line (57) is compared with the pattern division value (B0) over the entire length of the 3-4 system straight line (53). 3-4 system expansion and contraction rate (β) is obtained,
Contour coordinates in the master pattern are corrected with the 3-4 system expansion / contraction rate (β) for the handle (HB) included in the section sandwiched between the 3-4 system straight line (53) and the middle section line (57). To obtain correction data for cutting the pattern (HB),
Using the obtained correction data for the 1-2 system and 3-4 system, the material material (W) on the cutting table (2) is cut by the cutting head (3). Method. In order to obtain correction data for cutting of the 1-2 system and 3-4 system, preceding, following, or in parallel,
A virtual line (60) connecting the first point mark (P1) and the third point mark (P3) or a virtual line parallel thereto is set as a 1-3 system straight line (61),
A virtual line (62) connecting the second point mark (P2) and the fourth point mark (P4) or a virtual line parallel thereto is set as a 2-4 system straight line (63),
An intermediate mark (65) existing between the first point mark (P1) and the second point mark (P2) and an intermediate position existing between the third point mark (P3) and the fourth point mark (P4). An intermediate dividing line (67) that divides the 1-3 system straight line (61) and the 2-4 system straight line (63) by connecting the marks (66) to each other is set.
An initial value that this intermediate dividing line (67) should exist between the 1-3 system straight line (61) and the 2-4 system straight line (63) is determined as a 1-3 system straight line (30) in the pattern frame (30). 61) as the pattern division value (C0) from the edge (33) corresponding to 61) and the pattern division value (D0) from the edge (34) corresponding to the 2-4 system straight line (63),
The measured value of the mutual distance (C) between the 1-3 system straight line (61) and the intermediate dividing line (67) is compared with the pattern division value (C0) over the entire length of the 1-3 system straight line (61). 1-3 system expansion and contraction rate (γ) is obtained,
Contour coordinates in the master pattern are corrected with the 1-3 system expansion / contraction rate (γ) for the handle (HC) included in the section sandwiched between the 1-3 system straight line (61) and the intermediate section line (67). To obtain correction data for cutting the pattern (HC),
The measured value of the mutual distance (D) between the 2-4 system straight line (63) and the intermediate dividing line (67) is compared with the pattern division value (D0) over the entire length of the 2-4 system straight line (63). Obtain 2-4 system expansion / contraction rate (δ),
The contour coordinates in the master pattern of the pattern (HD) included in the section sandwiched between the 2-4 system straight line (63) and the middle section line (67) are corrected with the 2-4 system expansion / contraction rate (δ). To obtain correction data for cutting the pattern (HD),
On the cutting table (2) by the cutting head (3) using the correction data for cutting of the 1-2 system and 3-4 system together with the correction data for cutting of the 2-4 system and 1-3 system. The dough cutting method according to claim 5, wherein the material dough (W) is cut.   The cloth cutting method according to claim 5 or 6, wherein the intermediate mark (55, 56) used for setting the intermediate dividing line (57) is one point in the handle.

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