JP5662138B2 - Sheet material cutting method and automatic cutting machine - Google Patents

Description

  The present invention relates to a sheet material cutting method for cutting a sheet material such as a fabric placed on a table into parts having a predetermined pattern, and an automatic cutting machine employing the method.

  When finishing a fabric or fabric into a product such as clothing, it is necessary to cut each part such as a front body, a back body, and a sleeve from a sheet material such as a fabric. Usually, an automatic cutter is used to cut the sheet material placed on the table based on the shape data of each part output from the controller.

  On the other hand, when creating a garment or the like using a sheet material with a pattern, pattern matching is required in the process of sewing the parts together. If the patterns that characterize each part, such as the front and sleeves, do not match after sewing, the merchandise value as clothing decreases.

  However, it is difficult to perform the pattern matching operation only in the sewing process, and it is important to cut the pattern in consideration of the pattern alignment of each part in the cutting process.

  2. Description of the Related Art Conventionally, two methods are mainly employed as a pattern matching method for parts in an automatic cutting machine. The first method is, for example, the method described in Patent Document 1.

  In the first method, for example, when cutting a lattice-patterned fabric, a reference line representing a theoretical pattern and a pattern (shape) of the part to be cut are displayed on the screen of the display in advance, and the parts are arranged on the screen. And pattern matching. At this time, for each part, a reference mark for pattern matching is generated at a position overlapping the reference line.

  Next, the fabric pattern placed on the table is photographed with a camera and displayed on a display screen, and a reference mark is displayed on the screen. Each part is positioned by moving the reference mark to a corresponding position on the pattern.

  Thereafter, the cutting data for each part is corrected based on the deviation data generated by the movement of the reference mark, and the theoretical pattern arrangement stored in the memory is matched with the pattern arrangement of the stretched sheet material. Thereafter, the sheet material is cut based on the corrected data.

  The second method is, for example, the method described in Patent Document 2. In the second method, the actual size pattern of the part to be cut is projected onto the sheet material placed on the table, and the operator performs cutting after visually matching the pattern of the sheet material with the projected part pattern. .

Japanese Patent No. 2538514 Japanese Patent Laid-Open No. 9-279474

  The above two pattern matching methods are effective when the sheet material is not distorted. However, in many automatic cutting machines, a sheet material having a required length is pulled out from the sheet material wound in a roll shape and stretched on the table. At this time, the sheet material may be distorted due to the winding state or the tension at the time of drawing.

  A part obtained by cutting a sheet material in which distortion has occurred becomes a shape different from the original cutting pattern when the distortion disappears by cutting. When sewing is performed using such parts, a pattern shift occurs between other parts. Moreover, since the size of the completed clothing is different from the planned size, the commercial value is significantly reduced.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a sheet material cutting method capable of cutting a part with a pattern corresponding to the distortion of the sheet material, resulting in a part with less distortion. And

In order to achieve the above object, a sheet material cutting method according to the present invention is a method for cutting a patterned sheet material along a pattern of at least one part, and includes the following steps: .
Forming a theoretical pattern on the virtual plane corresponding to the sheet material corresponding to a feature point of the pattern on the sheet material;
Placing the pattern of the parts on the virtual plane, and setting a pattern matching point for each part so as to overlap the theoretical pattern of patterns ;
On the virtual plane, forming a reference pattern that is configured by a straight line parallel to the theoretical pattern of the pattern and includes the pattern matching point;
After projecting the pattern matching point and the reference pattern to the sheet material placed on the table in actual size using a projector, the pattern matching point is moved to a corresponding position on the sheet material, or the pattern matching point Projecting the reference pattern in actual size after moving to the corresponding position of the sheet material
Transforming the shape of the reference pattern projected onto the sheet material according to the shape of the handle of the sheet material, and correcting the coordinate data of the reference pattern according to the deformation,
Correcting the coordinate data of the pattern of the part corresponding to the coordinate data of the corrected reference pattern;
Cutting the sheet material based on the coordinate data of the corrected pattern of the parts.

  Here, it is preferable to project the pattern of the parts together with the pattern matching point onto the sheet material placed on the table in actual size. Further, when the pattern of the sheet material is in a lattice shape, it is preferable that the pattern matching point is set at an intersection of vertical stripes and horizontal stripes.

  When the pattern of the patterned sheet material is in a stripe shape, the pattern matching point is set on the stripe, and when the pattern matching point projected on the sheet material is overlaid on the corresponding pattern, the pattern matching The point is preferably moved in a direction perpendicular to the stripe so that the point overlaps the stripe pattern.

In addition, when the pattern of the sheet material is in a lattice shape and the distortion in the direction orthogonal to the sheet material conveyance direction among the distortion generated in the sheet material can be ignored , when correcting the coordinate data of the reference pattern, Only the data of the coordinate axes in the direction parallel to the conveying direction of the sheet material may be corrected.

  In addition, the theoretical pattern pattern together with the reference pattern is projected onto the sheet material placed on the table, the theoretical pattern pattern is deformed together with the reference pattern, and a correction value of the obtained coordinate data is obtained. Based on this, the coordinate data of the part pattern may be corrected.

The automatic cutting machine according to the present invention is an automatic cutting machine for cutting a patterned sheet material along a pattern of at least one part,
A cutting machine body having a table on which a patterned sheet material is placed on the upper surface;
A cutting unit for cutting the sheet material placed on the table along a pattern of parts;
A cutting unit driving means for driving the cutting unit;
A data processing device for generating a driving signal for the cutting unit driving means;
A controller for an operator to input necessary data to the data processing device;
A projector that projects an image created by the data processing device onto a sheet material placed on the table;
The data processing device executes any one of the sheet material cutting methods described above.

  In the present invention, since the cutting data for each part after the reference pattern is deformed is corrected corresponding to the distortion of the sheet material, the pattern (shape) of the separated part is the original pattern without distortion. It becomes the shape and pattern corresponding to. When sewing is performed using the parts cut in this way, clothing having no pattern and dimensional deviation can be produced.

It is a figure which shows the structure of the automatic cutting machine which implements the cutting method of this invention. It is a figure explaining the process step of the cutting method concerning Embodiment 1 of this invention. It is a block diagram which shows the structure of the control system of the automatic cutting machine of FIG. 3 is a flowchart showing specific processing steps of the cutting method according to the first exemplary embodiment; It is a figure explaining the process step of the cutting method concerning Embodiment 2 of this invention. It is a figure explaining the cutting method concerning Embodiment 3 of this invention.

  Hereinafter, a sheet material cutting method and an automatic cutting machine according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
<Configuration of automatic cutting machine>
FIG. 1 shows the overall configuration of an automatic cutting machine that implements the cutting method of the present invention. The automatic cutting machine 1 includes a cutting machine body 3, a cutting unit 4, a cover sheet feeding device 5, a data processing device 6, a display 7, a controller 8, a projector 9, and a cutting unit driving device 10.

  On the upper surface of the cutter body 3, a table 31 is placed on which the sheet material 2 with a pattern to be cut (shown with a part cut away in the figure) is placed. The table 31 is composed of a conveyor, and the sheet material 2 fed out from the unfolding device (not shown) is conveyed in the direction of arrow A by the conveyor and spread on the table 31. The surface of the table 31 is covered with a bristle brush 32 (only a part is shown) so that the table 31 is not cut during cutting.

  In the following description, as shown in FIG. 1, the sheet material placement surface of the table 31 is represented by XY coordinates, the direction parallel to the conveying direction A of the sheet material 2 is the X axis, and the direction orthogonal thereto is the Y axis. And The direction orthogonal to the plane defined by the XY coordinates is taken as the Z axis.

  The cutting unit 4 is configured to be movable in the X-axis direction by a pair of carriages 41, and an arm 42 is attached to the carriage 41 so as to straddle the table 31. A cutting head 43 that is movable in the Y-axis direction is attached to the arm 42, and a cutter 44 that cuts the sheet material 31 is attached to the lower portion of the cutting head 43. The cutter 44 is movable in the Z-axis direction, and moves downward when the sheet material 2 is cut.

  The carriage 41 is moved in the X-axis direction by a motor and an endless belt (not shown) housed in the cutting machine main body 3, and the cutting head 43 is a motor in the carriage 41 and a belt in the arm 42 (both are both). Move in the Y-axis direction. The cutter 44 is moved in the Z-axis direction by a motor (not shown) in the cutting head 43. These motors are controlled by a signal from a cutting unit driving device 10 accommodated in the cutting machine body 3.

  The cutting head 43 moves the region indicated by B on the table 31 back and forth and left and right with the cutter 44 reciprocating up and down, and the sheet material 2 is formed into a designated pattern in accordance with a signal from the cutting unit driving device 10. Cut along. The cutter 44 may be a cutter that reciprocates a knife-like blade to cut a sheet material, or a cutter that rotates a disk-like blade to cut a sheet material.

  The covering sheet feeding device 5 covers the surface of the sheet material 2 with a transparent and non-breathable covering sheet 51 such as polyethylene (partially cut out in the drawing). The covering sheet 51 is used to prevent the position of the sheet material 2 from being shifted during cutting. The covering sheet 51 fed out from the roll sheet 52 is transported in the direction of arrow A together with the sheet material 2 by the conveyor of the table 31, and between the vicinity of the stand 54 provided at the front end of the table 31 and the covering sheet feeding device 5. Can be spread.

  The covering sheet 51 is provided with a ventilation hole (not shown) formed on the surface of the table 31 by a suction device (not shown) built in the cutting machine body 3, and the front and rear ends of the cutting machine body 3. Is sucked through the vent hole 33 formed on the upper surface of the sheet material and pressed against the sheet material 2 and the cutter body 3.

  The data processing device 6 creates and corrects various data for cutting the sheet material, generates display data for the display 7, generates projection data for the projector 9, and generates driving data for the cutting unit driving device 10. The sheet material cutting data created by the data processing device 6 is sent to the cutting unit driving device 10 to control the operation of the cutting unit 4. The data processing device 6 can be composed of a commercially available personal computer.

  Of the data input to the data processing device 6, part pattern data is input via a network or an external memory such as a USB memory, and correction data is input via the controller 8. Other data is input by the operator using the keyboard 69 or a mouse (not shown).

  The display 7 is used when determining the arrangement of the part pattern on the sheet material 2, and the theoretical pattern pattern and part pattern (shape) of the sheet material are displayed on the screen of the display 7. The controller 8 is used to input data in the creation and correction work of cutting data, which will be described later.

  The controller 8 has the same structure as a commercially available game controller and has the same function. The controller 8 employs a method of wirelessly transmitting data to the data processing device 6 so that the operator can freely move around the cutting table 31.

  The projector 9 displays an image created by the data processing device 6 on the sheet material 2 placed on the table 31, displays a reference pattern to be described later on the sheet material 2, and displays the controller 8. At the same time, it is used to correct cutting data. As the projector 9, various projection display devices can be used in addition to a commercially available liquid crystal projector or a DLP projector.

  Although not shown, a spreader is installed on the upstream side of the sheet material transport method A of the cutter body 3, and the sheet material 2 wound in a roll shape is fed out and spread on the table 31. Similarly, a pickup table is installed on the downstream side of the sheet material conveying method A of the cutting machine body 3, and the cut sheet material 2 is carried out onto the table.

  In the present embodiment, a case where one sheet material 2 is placed on the table 31 and cut is described. However, the sheet material 2 is repeatedly fed and cut by the spreader, and the sheet is placed on the table 31. The material 2 may be laminated, and a plurality of sheet materials may be cut at a time. However, in this case, it is a condition that the strains of the laminated sheet materials are almost the same.

<Sheet material cutting processing steps>
Next, with reference to FIG. 2, the processing steps when the cutting method of the present invention is carried out using the automatic cutting machine 1 shown in FIG. 1 will be described.

  FIG. 2A shows an arrangement in which patterns (shapes) 22a and 22b (hereinafter collectively referred to as “pattern 22”) of parts to be cut are arranged on a sheet material 2 having a lattice pattern 21. . As shown in FIG. 1, the sheet material to be actually cut is a rectangle, and a plurality of parts having different patterns are arranged on the sheet material. In FIG. 2, a square sheet is used for easy understanding. A case where two parts are arranged on the material 2 is shown.

  First, the operator uses the data processing device 6 to form a theoretical pattern 12 of the sheet material 2 on a virtual plane 11 composed of the X axis and the Y axis as shown in FIG. Formed and displayed on the screen of the display 7. The X axis and Y axis in the figure correspond to the X axis and Y axis of the sheet material placement surface of the table 31 in FIG. The origin O is a mark for alignment.

  The theoretical pattern 12 is created based on the distance between the actual patterns 21 of the sheet material 2 and the thickness of the line, and is usually abstract so that the feature points of the pattern can be understood instead of the pattern itself. It is expressed in a form. In the example shown in FIG. 2B, the theoretical pattern 12 is composed only of center lines of vertical stripes and horizontal stripes constituting a lattice pattern.

  Next, as shown in FIG. 2C, the worker displays the patterns 22 a and 22 b of the parts to be cut on the theoretical pattern 12 displayed on the screen of the display 7. In this state, the operator operates the mouse to adjust the positions and rotation angles of the part patterns 22a and 22b, and determines the arrangement of the part patterns while considering the pattern.

  The data of the part patterns 22a and 22b is created in advance using a CAD (Computer Aided Design) device or the like, and the data is stored in the RAM of the data processing device 6 via a network such as a LAN or using a USB memory or the like. Keep in.

  Subsequently, the operator operates the mouse to display the positioning marker 13 on the screen, and moves the marker so that the pattern matching points 14a and 14b (hereinafter collectively referred to as "pattern matching point 14" for each part). ”). The pattern matching point 14 is a reference point for pattern matching, and is set at a location that is easy to understand in appearance, such as an intersection of a vertical stripe and a horizontal stripe, and has a large influence when the pattern is shifted. When the part pattern is large, a plurality of pattern matching points 14 may be set.

  Next, the data processing device 6 creates a reference pattern 15 including the pattern matching points 14a and 14b and displays it on the screen as shown in FIG. The reference pattern 15 is used when the cutting data is corrected in accordance with the distortion of the sheet material 2. In the example of FIG. 2D, the reference pattern 15 is configured by straight lines parallel to the vertical stripes and horizontal stripes of the theoretical pattern 12.

  When the reference pattern 15 is created, the pattern data passing through the pattern matching point 14 from the theoretical pattern pattern 12 is directly used as a reference pattern, or data passing through the pattern matching point 14 is newly created.

  Next, as shown in FIG. 2 (e), the operator uses the projector 9 to project the reference pattern 15 together with the part patterns 22 a and 22 b to the sheet material 2 placed on the table 31 in actual size. At this time, the above-described origin O is projected together, the position of the origin O is matched with the corresponding position of the sheet material 2, and the origin O of the coordinate data of the virtual plane 11 is made coincident with the origin of the coordinate data of the sheet material. The reference pattern 15 and the part patterns 22a and 22b are preferably projected in a highly saturated color such as red or green so that the pattern can be easily understood.

  As shown in FIG. 2 (e), the sheet material 2 placed on the table 31 is distorted due to stress applied at the time of stretching. Note that the vertical stripes and horizontal stripes of the handle 21 actually have a complicated shape as shown in FIG. 2 (a). However, in FIG. It is represented by a line. The same applies to the subsequent drawings.

  Next, as shown by an arrow in FIG. 2E, the operator operates the controller 8 to move the projected reference pattern 15 so that the pattern matching points 14a and 14b correspond to the actual patterns. Overlay on the place to be. FIG. 2 (f) shows a state where the pattern matching points 14a and 14b are overlapped with corresponding portions of the actual pattern.

  Next, the operator operates the controller 8 to deform all of the reference patterns 15 projected by the projector 9 in accordance with the handle 21 as shown in FIG. Since the reference pattern 15 overlaps the actual pattern 21 at the pattern matching points 14a and 14b, the deformation of the reference pattern 15 only needs to coincide with the center line of the vertical stripe or horizontal stripe of the pattern.

  Each time the operator operates the controller 8 to deform the reference pattern 15, the data processing device 6 calculates the amount of displacement, corrects the coordinate data, and stores the value in the built-in RAM. Note that the displacement amount may be calculated in a lump after all the reference patterns have been transformed.

  After the deformation is completed for all the lines of the reference pattern 15, when the operator notifies the data processing device 6 of the completion of the work using the controller 8, the data processing device 6 receives the corrected coordinate data stored in the RAM. read out. The data processing device 6 calculates the coordinate shift of the virtual plane 11 using the read data, and corrects the coordinate data of the part patterns 22a and 22b based on the calculated value.

  FIG. 2 (h) shows a state in which the corrected part patterns 22 a and 22 b are projected onto the sheet material 2 using the projector 9. In FIG. 2G described above, the part patterns 22a and 22b before data correction are projected. As can be seen by comparing FIG. 2G and FIG. 2H, the part patterns 22a and 22b after the data correction are deformed in accordance with the distortion of the sheet material 2. Therefore, if cutting is performed using the corrected pattern data, a part with little influence of distortion can be obtained.

  As described above, in the cutting method of the present invention, the reference pattern 15 created corresponding to the theoretical pattern 12 of the sheet material 2 is projected to the sheet material 2 placed on the table 31 in actual size, The part pattern cutting data is corrected by deforming the reference pattern 15 in accordance with the actual pattern 21. Usually, the reference pattern overlaps with the feature point (for example, vertical stripe or horizontal stripe) of the pattern of the sheet material. Accordingly, the deformation of the reference pattern only needs to be performed by deforming the projected reference pattern according to the pattern, so that the operation can be performed easily and reliably.

  As another method for creating the reference pattern, it is also conceivable to draw lines parallel to the vertical stripes and the horizontal stripes at equal intervals on the virtual plane and use them as the reference pattern. When this method is employed, the accuracy of coordinate data correction increases if the pattern interval is narrow, but the amount of data processing becomes enormous and the workability deteriorates. On the other hand, widening the pattern spacing reduces the amount of data processing and improves workability. However, on the other hand, the parts that match the pattern located between the patterns are handled when the reference pattern is deformed. The alignment will shift. In that case, it becomes necessary to move the parts again after the deformation of the reference pattern, and the workability is lowered. On the other hand, if the above-described method of the present invention is adopted, the reference pattern is made from the pattern matching points, so that the pattern matching does not shift when the reference pattern is deformed.

  In the above description, the reference pattern 15 including the pattern matching point 14 is projected onto the sheet material 2 placed on the table 31. However, the pattern matching point 14 is positioned only by using the pattern matching point 14. It can be carried out. Therefore, initially, only the pattern matching point 14 may be projected together with the marker 13, and the reference pattern 15 may be projected onto the sheet material 2 after the positioning is completed.

  However, in this case, it is preferable to project the part patterns 22a and 22b together with the pattern matching point 14. This is because it is easy to find the position of the pattern corresponding to the pattern matching point of the sheet material 2 when the part patterns 22a and 22b are projected.

<Operation of automatic cutter>
Next, the operation of the automatic cutting machine 1 will be described with reference to FIGS. FIG. 3 shows the configuration of the control system of the automatic cutter 1, and FIG. 4 shows the operation flow of the automatic cutter 1.

  As shown in FIG. 3, the control system of the automatic cutting machine 1 includes a data processing device 6, a display 7, a controller 8, a projector 9, and a cutting unit driving device 10. Among these, since members other than the data processing device 6 have been described above, the data processing device 6 will be described here.

  The data processing device 6 includes a calculation unit 61, a ROM 62, and a RAM 63 including a CPU. The calculation unit 61 implements many functions shown in the block by reading and executing software stored in the ROM 62 or a hard disk (not shown) as an external storage device. The RAM 63 has a function as a working memory, and temporarily stores data calculated by the calculation unit 61.

  Of the functions realized by the calculation unit 61, the data creation means 64 creates the theoretical pattern pattern 11, the pattern matching point 15 and the reference pattern 16 shown in FIG. Data such as the interval and thickness of the pattern necessary for creating the theoretical pattern 11 is taken into the RAM 63 by the USB memory or the like together with the data of the part pattern 22. The data of the pattern matching point 14 and the reference pattern 15 is created based on data input from the mouse.

  The data correction unit 65 corrects the coordinate data of the reference pattern 15 based on the data input from the controller 8 and further corrects the coordinate data of the part pattern 22 based on the corrected coordinate data of the reference pattern 15.

  The display data generation unit 66 generates data to be displayed on the display 7 based on the data generated by the data generation unit 64 and the data correction unit 65. Similarly, the projection data generation unit 67 generates data to be displayed on the projector 9 based on the data generated by the data generation unit 64 and the data correction unit 65.

  The cutting data generating unit 68 generates driving data for the cutting unit driving unit 10 based on the coordinate data of the pattern 22 of each part corrected by the data correcting unit 65.

  Next, specific processing steps in the automatic cutter 1 will be described with reference to the flowchart of FIG. In step S1, the data creation means 64 of the calculation unit 61 reads data relating to the pattern of the sheet material stored in the RAM 63 in accordance with the operator's instruction, and applies the theoretical pattern shown in FIG. Create on top. The display data generating unit 66 displays the pattern on the screen of the display 7.

  In step S2, the data creating means 64 reads out the data of the part pattern 22 stored in the RAM 63 and displays it over the theoretical pattern 12 as shown in FIG. The operator operates the mouse to move the position of the part displayed on the screen, and determines the arrangement of the part while considering the position of the handle and the rotation angle. Subsequently, in step S3, the worker displays the marker 13 on the screen and sets the pattern matching point 14 for each part.

  In step S4, the data creation means 64 creates the cross-shaped reference pattern 15 including the pattern matching point 14 at the intersection point according to the operator's instruction. The display data generating unit 66 displays the reference pattern on the screen.

  In step S <b> 5, the operator operates the unfolding device (not shown) and the covering sheet feeding device 5 to place the sheet material 2 and the covering sheet 51 on the table 31 of the cutter body 3. Then, the suction device installed in the cutting machine main body 3 is operated, and the sheet material 2 and the covering sheet 51 are firmly fixed to the table 31 by negative pressure. The placement of the sheet material 2 on the table 31 is performed in parallel with the data creation processing in steps S1 to S4.

  In step S <b> 6, the projection data generation unit 67 generates projection data of the reference pattern and part pattern shown in FIG. 2 (d) according to the operator's instruction, and transfers the data to the projector 9. The transferred data is projected to the sheet material 2 placed on the table 31 by the projector 9 in actual size.

  In step S7, the operator operates the controller 8 to move the projected reference pattern 15, and the pattern matching point 14 is moved to the corresponding sheet material 2 by the procedure shown in FIGS. 2 (e) and (f). Overlay the handle. As described above, the pattern matching point 15 is displayed in a clear color, and is set at the intersection of the vertical and horizontal stripes of the lattice, so that the alignment can be performed relatively easily.

  In step S8, the operator operates the controller 8 to deform each straight line of the reference pattern 16 according to the corresponding pattern as shown in FIG. Along with the deformation of the reference pattern, the data correction means 65 of the calculation unit 61 corrects the coordinate data of the reference pattern 15.

  In step S9, the calculation unit 61 determines whether or not the deformation has been completed for all the lines constituting the reference pattern 15. If the deformation has been completed, the process proceeds to step S10, and the deformation has not been completed. In this case, the process returns to step S8.

  In step S <b> 10, the data correction unit 65 corrects the data of the part pattern 22 arranged on the virtual plane 11 in a form corresponding to the corrected coordinate data of the reference pattern 15. Subsequently, the cutting data generating unit 68 generates cutting data based on the corrected data of the part pattern 22.

  In the modification of the coordinate data of the part pattern 22, as an example, the displacement amount of each point set in a grid pattern in the XY coordinates is calculated based on the displacement amount of the coordinate data of the reference pattern, and the displacement amount is corresponded. The value is added to the coordinate data of the part pattern. However, the present invention is not limited to this method, and an optimum method may be adopted in consideration of the pattern characteristics.

  In step S11, the cutting data generated by the cutting data generating unit 68 is transferred to the cutting unit driving unit 10, and the cutting of the sheet material 2 is executed by driving the cutting unit.

  The sheet material 2 that has been cut is then driven on the conveyor of the table 31 and conveyed onto a pickup table (not shown) together with the covering sheet 51, and the cutting operation is completed.

  The above description is based on the assumption that the position and rotation direction of the coordinate data of the reference pattern are corrected. However, as can be seen from the configuration of the automatic cutting machine in FIG. 1, the distortion of the sheet material 2 occurs mainly in the X-axis direction parallel to the conveyance direction A of the sheet material 2 and hardly occurs in the Y-axis direction orthogonal thereto.

  In order to perform precise correction of coordinate data, it is necessary to correct both the coordinates in the X-axis direction and the Y-axis direction. If distortion in the Y-axis direction can be ignored, only correction in the X-axis direction is necessary. By doing so, the amount of computation in the computation unit 61 can be greatly reduced, leading to a reduction in work time.

(Embodiment 2)
In the first embodiment, the cutting of the sheet material having the lattice pattern has been described. However, in the cutting of the sheet material having the stripe pattern, the processing steps until the cutting are slightly different. In the present embodiment, with reference to FIG. 5, processing steps in the case of cutting a sheet material having a striped pattern will be described focusing on differences from the cutting of a sheet material having a grid pattern.

  FIG. 5A shows a pattern of parts 22a and 22b cut into a sheet material 2A having a striped vertical stripe pattern 21A. As in FIG. 2, for the sake of easy understanding, a state in which two parts are arranged on the square sheet material 2 </ b> A is shown.

  Unlike the grid pattern, when cutting a striped pattern sheet material, there is almost no need to consider the pattern alignment in the direction parallel to the stripe, so the processing when cutting the sheet material corresponding to this The contents are different.

  FIG. 5B shows a state in which parts patterns 22a and 22b to be cut into the theoretical pattern 12A and the positioning marker 13 are displayed in an overlapping manner. A difference from the lattice-like pattern shown in FIG. 2 is that a theoretical pattern 12A corresponding to a stripe is composed of straight lines extending in the vertical direction.

  In the grid pattern, the pattern matching point 14 is set at the intersection of the vertical stripe and the horizontal stripe of the pattern 21. However, since there is no intersection in the stripe pattern, on the straight line overlapping the theoretical pattern 12 (vertical stripe in the figure). Pattern matching points 14a and 14b are set at any of the points.

  FIG. 5C shows a state in which the reference pattern 15A including the pattern matching points 14a and 14b is displayed superimposed on the theoretical pattern pattern 12A. Unlike the lattice pattern, the reference pattern 15A is represented by a straight line parallel to the vertical stripes.

  FIG. 5D shows a state in which the projector 9 projects the reference pattern 15A on the sheet material 2A placed on the table 31 in actual size. In the alignment of the pattern matching points 14a and 14b, unlike the lattice pattern, as shown in FIGS. 5D and 5E, the pattern matching points 14a and 14b are aligned with the vertical stripes of the pattern. Move horizontally until. This is because it is not necessary to consider the pattern alignment in the direction parallel to the stripe in the stripe pattern as described above.

  Thereafter, as shown in FIG. 5F, the reference pattern 15A is deformed in accordance with the vertical stripes of the pattern. In this way, the reference pattern data and the part pattern data are corrected, and cutting data is generated based on the corrected data.

  In the present embodiment, the case of cutting a sheet material having a vertical stripe, that is, a pattern parallel to the Y axis has been described, but the above-described cutting method can also be applied to a sheet material having a horizontal stripe, that is, a pattern parallel to the X axis. Needless to say.

  Furthermore, for patterns that do not have clear vertical stripes or horizontal stripes such as floral patterns, the patterns are generally repeatedly arranged in the X-axis direction or the Y-axis direction. Accordingly, by drawing a straight line connecting the central portions of the floral pattern, temporary vertical stripes, horizontal stripes, or lattices can be formed, and the above-described cutting method can be applied to the temporary vertical stripes, horizontal stripes, or lattices.

(Embodiment 3)
When cutting by placing multiple parts with different patterns on the sheet material, the reference pattern is distributed and arranged on the sheet material. It is distributed on a plane. On the other hand, when there is a bias in the arrangement of the reference pattern, such as when the long pattern parts are biased in the sheet material, it is necessary to correct the coordinate data depending on the location. Insufficient data.

  If the part pattern data is corrected based on such data, an error from the actual distortion increases, and the reliability of the cutting data decreases. In the present embodiment, a data complementing method when there is a bias in the arrangement of reference patterns will be described.

  FIG. 6 shows the theoretical pattern 12B, the patterns 22c-22f of each part, and the reference pattern 15B on the virtual plane 11 when the elongated part patterns 22c-22f are arranged in the vertical direction of the sheet material. Shows the state of placement.

  Since the part patterns 22c to 22f are aligned in the vertical direction and the pattern matching points 14c to 14f are set to be biased upward, the reference pattern 15B created with the pattern matching points as intersections is also on the sheet material. It exists in half. When data for correcting coordinate data is created by deforming such a reference pattern, the density of the correction data is low in the lower half of the sheet material, and particularly there is almost no correction data in the Y-axis direction.

  When the part pattern data is corrected based on such data, an error in the correction data in the lower half of the sheet material increases, and as a result, it is difficult to appropriately correct the cutting data.

  In this embodiment, in such a case, the correction of the cutting data is realized by complementing the low density area of the reference pattern with the theoretical pattern pattern data.

  Specifically, the theoretical pattern 12B shown in FIG. 6 is projected onto the sheet material 2 placed on the table 31 together with the reference data 15B using the projector 9. The operator deforms the lines constituting the projected pattern in the same manner as the reference pattern 15B. The data correction means 65 of the calculation unit 61 corrects the data of the part patterns 22c to 22f arranged on the virtual plane 11 based on the deformation data of both the reference pattern 15B and the pattern pattern 12B.

  When the number of lines constituting the theoretical pattern 12B is large, a pattern used for data correction is selected from the patterns and only the selected pattern is deformed. It can be done efficiently. In this case, the pattern not selected does not function as a reference pattern.

  As described above, by using the sheet material cutting method according to the present invention, it is possible to obtain a pattern part from which the influence of the distortion of the sheet material placed on the cutting table is removed. By sewing after this part, it is possible to produce clothing with a high commercial value with no pattern or dimensional deviation.

DESCRIPTION OF SYMBOLS 1 Automatic cutting machine 2, 2A Sheet material 3 Cutting machine main body 4 Cutting unit 5 Cover sheet feeding apparatus 6 Data processing apparatus 7 Display 8 Controller 9 Projector 10 Cutting unit drive apparatus 11 Virtual plane 12, 12A, 12B Theoretical pattern 13 Marker 14a-14f Pattern matching point 15, 15A, 15B Reference pattern 21 Pattern 22a-22f Part pattern 31 Table 32 Bristle brush 33 Vent hole 41 Carriage 42 Arm 43 Cutting unit 44 Cutter 51 Cover sheet 52 Sheet roll 53 Stand 61 Calculation unit 62 ROM
63 RAM
64 Data creation means 65 Data correction means 66 Display data generation means 67 Projection data generation means 68 Cutting data generation means 69 Keyboard

Claims (7)

A sheet material cutting method comprising cutting a patterned sheet material along a pattern of at least one part, the method including the following steps.
Forming a theoretical pattern on the virtual plane corresponding to the sheet material corresponding to a feature point of the pattern on the sheet material;
Placing the pattern of the parts on the virtual plane, and setting a pattern matching point for each part so as to overlap the theoretical pattern of patterns ;
On the virtual plane, forming a reference pattern that is configured by a straight line parallel to the theoretical pattern of the pattern and includes the pattern matching point;
After projecting the pattern matching point and the reference pattern to the sheet material placed on the table in actual size using a projector, the pattern matching point is moved to a corresponding position on the sheet material, or the pattern matching point Projecting the reference pattern in actual size after moving to the corresponding position of the sheet material
Transforming the shape of the reference pattern projected onto the sheet material according to the shape of the handle of the sheet material, and correcting the coordinate data of the reference pattern according to the deformation,
Correcting the coordinate data of the pattern of the part corresponding to the coordinate data of the corrected reference pattern;
Cutting the sheet material based on the coordinate data of the corrected pattern of the parts.   The sheet material cutting method according to claim 1, wherein the pattern of the part is projected to the sheet material placed on the table together with the pattern matching point in actual size.   3. The sheet material cutting method according to claim 1, wherein when the pattern of the sheet material is in a lattice shape, the pattern alignment point is set to an intersection of a vertical stripe and a horizontal stripe. When the pattern of the patterned sheet material is in a stripe shape, the pattern matching point is set on the stripe,
Also when stacking the pattern matching point projected on the sheet material in the corresponding handle, characterized in that moves in the direction the handle alignment point is perpendicular to the stripes so as to overlap the stripe pattern, according to claim 1 or cutting method of the sheet member according to 2. When the pattern of the sheet material is in a lattice shape and the distortion in the direction orthogonal to the sheet material conveyance direction among the distortions generated in the sheet material can be ignored, when correcting the coordinate data of the reference pattern, the sheet 3. The sheet material cutting method according to claim 1, wherein only the coordinate axis data in a direction parallel to the material conveyance direction is corrected. 4.   Projecting the theoretical pattern pattern together with the reference pattern onto a sheet material placed on the table, deforming the theoretical pattern pattern together with the reference pattern, and based on the correction value of the obtained coordinate data 6. The sheet material cutting method according to claim 1, wherein coordinate data of the pattern of the parts is corrected. An automatic cutting machine for cutting a patterned sheet material along a pattern of at least one part,
A cutting machine body having a table on which a patterned sheet material is placed on the upper surface;
A cutting unit for cutting the sheet material placed on the table along a pattern of parts;
A cutting unit driving means for driving the cutting unit;
A data processing device for generating a driving signal for the cutting unit driving means;
A controller for an operator to input necessary data to the data processing device;
A projector that projects an image created by the data processing device onto a sheet material placed on the table. The data processing device drives the sheet material according to any one of claims 1 to 6. An automatic cutting machine characterized in that the method is carried out.