JP2877629B2 - Sheet cutting pattern forming method and sheet cutting method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a pattern for cutting a sheet and a method for cutting a sheet using the same, and more particularly, to a method of yielding a sheet wound in a roll or a flat sheet with a width and the number of sheets as required. The present invention relates to a method of creating a cutting pattern for cutting with the maximum value More particularly, the present invention relates to a sheet cutting method called comb tooth removal. Comb boring is a method of cutting a sheet of a fixed width horizontally in an appropriate length in a horizontal direction, and cutting a product having a width according to a demand at a divided portion (referred to as a layer in this specification). is there.

Generally, plastic films, synthetic papers,
Raw materials such as paper are processed into a sheet of a certain width and wound in a roll shape. According to an order, a necessary number of sheets of a required width are cut from the sheet and sold as a product. In this case, it is desired that the area of the remaining material after cutting in the cut portion is as small as possible from the viewpoint of not wasting the material.

[0003] In the case of a sheet or a plate which is not wound into a roll, a cutting method which does not waste material when cutting a necessary number of sheets having a required width in the same manner as described above is desired. The plastic film industry distinguishes between a roll product and a sheet product, but in the following description, an object to be cut is referred to as a "sheet" regardless of whether the cut product is wound in a roll shape.

[0004]

2. Description of the Related Art Conventionally, when a required number of sheets of a required width are cut out of a sheet material having a fixed width, the inexperienced material is prevented from remaining as much as possible after cutting according to the sense of a skilled person. Was.

[0005]

As described above, the mere reliance on a skilled worker does not always ensure that a necessary yield is secured, and in some cases, after cutting the sheet, the area becomes odd. Therefore, there is a problem that unusable materials remain in a large amount and the yield may be deteriorated. further,
It is necessary to consider the cutting method every time the order form is different, and there is a problem that the work of creating the cutting pattern is complicated and the time required for the creation is long.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a method for forming a pattern for sheet cutting, in which a required number of products of a required width are cut from a sheet, which is a raw material, at an optimum yield. An object is to provide a method for automatically creating without relying on it.

[0007]

In order to achieve the above object, a method provided by the present invention comprises the steps of: forming a plurality of products having different widths and lengths from a sheet having a constant width in the transverse direction; A method for creating a pattern for cutting a specified number of products so that each of the products has a specified width in the horizontal direction, wherein the pattern has at least one layer in the vertical direction, Each has at least one step in the vertical direction, and width is determined according to the type of the product for each layer in the horizontal direction of the pattern, and each of the steps in the section of the width is the Select one of the products corresponding to the width measurement, and select the pattern if the yield of product cutting in the pattern of the layer being created exceeds the allowable yield, and select the entire pattern than the pattern already stored Good yield and cutting Updated with the newly selected pattern a pattern working time is short pattern if the selected stored to a sheet cutting pattern creating method comprising the steps of.

According to another aspect of the present invention, there is provided a method of cutting a sheet by controlling a sheet cutting apparatus based on a sheet cutting pattern created by the above-described sheet cutting pattern creating method. FIG. 1 is a flowchart for explaining the principle of a method for forming a sheet cutting pattern provided by the present invention. Referring to FIG. 1, the method according to the present invention comprises, from a sheet having a constant width in the horizontal direction, changing a plurality of products having different widths and lengths so that each of the plurality of products has a specified width in the horizontal direction. A pattern forming method for cutting a designated number of each, wherein the pattern has at least one layer in the vertical direction, each of the layers has at least one step in the vertical direction, and The width is determined according to the type of the product for each layer, and each of the steps in the section of the width represents one product corresponding to the width. This pattern creation method includes the following steps.

(A) Step 11 for setting the allowable yield and the minimum required number, (B) Step 12 for setting the pattern formation target layer as the first layer, and (C) The number of layers in the previous layer Step 13 in which the smaller one of the maximum number of the products to be cut in the vertical direction of the sheet is the number of stages, (d) based on the number of the products to be cut and the number of stages Step 14 of determining the width combination for each product of the layer to be created by determining the number of horizontal widths of the product in Step 14; (e) Lateral yield obtained by dividing the total width in the horizontal direction by the width of the sheet Step (f) when the lateral yield is smaller than the allowable yield, the step number of the layer to be created is reduced by 1 and the process returns to step (16), (g) the lateral step Is higher than the allowable yield and If it does not match the combination of the widths in the direction, the combination of the widths in the horizontal direction at that time is selected as the pattern of the layer, and if they match, the process returns to step 16 (step 17). Step 18 for comparing the number of all products with the minimum required number; (i) If the number of all products of the pattern already selected in step 18 is smaller than the minimum required number, the processing of the remaining product number is performed in the next layer. If the number of all products of the pattern already selected in step 19 is equal to or more than the minimum required number in step 19, the process is advanced by one to the layer to be processed, and It is necessary for the total yield and the sheet cutting based on the pattern, which indicates the ratio of the horizontal width of the pattern to the horizontal width of the sheet with the pattern selected this time. Step 20 of comparing the cutting operation time indicating the total operation time, (e) If the total yield and cutting operation time of the pattern stored last time are better than the total yield and cutting operation time of the pattern selected this time, save the previous time. Step 21 for rewriting the selected pattern with the currently selected pattern, (v) If the total yield and cutting work time of the previously stored pattern are lower than the total yield and cutting work time of the currently selected pattern, the target layer To return to the first layer and reduce the number of steps by 1; (f) comparing the number of steps with 1; if the number of steps is 1 or more, returning to step 13;
(G) If the number of steps is smaller than 1 in step 23, it is determined whether or not there is a stored pattern. If there is a stored pattern, the process is terminated in step 24; If not, the allowable yield is reduced, and if the allowable yield becomes 0 or less, the process is terminated.

[0010]

According to the method of the present invention, when the product cutting yield in the pattern of the layer being formed exceeds the allowable yield, the pattern is selected, and the pattern is selected rather than the pattern stored in the step. When a pattern with a good overall yield and a short working time required for cutting is found, the stored pattern is updated with a new pattern, so that it automatically and in a short time It is possible to create a high yield sheet cutting pattern.

[0011]

FIG. 2 is a configuration diagram of a computer system used in an embodiment of the present invention. In the figure, a central processing unit (CPU) 201 includes an input device 202 and a program storage device 20 in the same manner as a normal computer system.
3. The data storage device 204 and the display device 205 are connected. The program storage device 203 stores a program for creating a sheet cutting pattern provided by the present invention. From the data input device 202, various data described later in detail are input. The display device 205 displays the pattern being created. Central processing unit (CPU)
201 creates a pattern in accordance with the data stored in the data storage device 204 and the program stored in the program storage device 203, displays the pattern on the display device 205, and
4. Save the created pattern. The central processing unit 201 can communicate with the blade position calculation device 207 via the communication device 206 and supplies the pattern data stored in the data storage device 204 to the blade position calculation device 207. The blade position calculation device 207 calculates the position of the blade for cutting the sheet based on the received pattern data, and provides the calculated value to the blade position control device 208. The blade position control device 208 controls the position of the blade of the cutting device 209 based on the received calculation value. Thereby, the cutting device 209
Based on the pattern created and stored in the data storage device 204, a required number of products of a required width are cut from the raw material. Actually, not only the position of the blade but also the position of the paper tube for winding each product are controlled based on the pattern data.

FIG. 3 is a perspective view showing a sheet-like raw material of a plastic film such as polyvinyl chloride used in an embodiment of the present invention, which is wound into a roll. A sheet-shaped raw material 1 of a plastic film is processed into a constant width W, and is usually wound around a winding device. The web 1 having a constant width W is cut into commodities of a required width according to a request from an orderer or by prospective production.

FIG. 4 is a diagram for comparing cutting patterns. In the figure, A is a diagram schematically showing a cutting pattern of “comb tooth removal” according to the present invention. "Comb tooth removal"
Are the rectangular arrangement of B, the divided arrangement of C, the nested arrangement of D, and E
Is different from the mosaic arrangement, the sketch of F, etc., and is a pattern cut linearly in the horizontal direction. Each row extending in the horizontal direction of the longitudinal lengths h ₁ , h ₂ ,... Of the sheet having the width W is referred to as a “layer” in this specification.

FIG. 5 is a plan view showing an example of a comb cutting pattern of the sheet 1 according to the embodiment of the present invention. In the figure, the width of the raw material 1 is the reference width W, but the width effective for cutting (slit) is the reference effective width W 'from which the ear portions are removed. The length of the raw material 1 is the reference length L, but the effective length for cutting is also the reference effective length L ′ from which the ear portions are removed. The cleavage pattern of the illustrated example, the width in the layer number of stages h ₁ a
Are in one row, and three rows are in width b. The number of steps in the next layer is h ₂ , one row of products of width c, one row of products of width d.
There is one row of products having a width and a width e. Each of the steps included in each layer represents one product of the corresponding width, and the length of one product is usually fixed and is set to several hundred meters to 1,000 meters or more. In the figure, for the sake of simplicity, the length of the step is shown to be extremely shorter than the actual length. The shaded portion is the remainder remaining after cutting. The method for automatically creating a cutting pattern for cutting a web is performed so that the area of the hatched portion is reduced as much as possible, that is, the yield of the web is cut as close to 100% as possible. Provided by example.

FIG. 6 is a side view of the sheet cutting apparatus used in the embodiment of the present invention. 2, the same parts as those in FIG. 2 are denoted by the same reference numerals. The sheet cutting device 209 is controlled by the computer 201 via the communication line 601. From the computer 201, data of the sheet cutting pattern created based on the sheet cutting pattern creating program provided by the present invention is supplied to the sheet cutting apparatus 209.

The sheet cutting device 209 includes a roller 602 for winding a sheet-shaped raw material having a certain width into a roll shape, rollers 604 to 610 for applying a certain tension to the sheet 603 drawn from the roller 602, Paper cores 611 and 612 for winding the product and paper core tables 613 and 614 for controlling the position of the paper core are provided. In the example of FIG. 5, the product of width c is wound around one of the paper tubes 611 and the product of width d is wound on the opposite side of the paper tube 612 so that each product is wound on each paper tube with the same tension. , And the product having the width e is wound around another one of the paper tubes 611, and so on.

FIGS. 7 to 11 are detailed flowcharts of the flowchart of FIG. 7 to 11, a method for forming a sheet cutting pattern according to an embodiment of the present invention will be described. Steps S1 to S3 in FIG. 7 correspond to step 11 in FIG. 1. In step S1, data necessary for calculation for sheet cutting is read. This data is stored in the data storage device 204 (see FIG. 2) using the input device 202 in advance.

The necessary data includes the following. 1. Input data ・ Raw material …… Rolled product to be slit (cut) Product type (thickness) …… Type (including thickness) distinguished by raw materials etc. Reference width …… Reference value W (effective slit width) of the whole width of the raw material + End width) Reference effective width …… Reference value W '= W of the effective width for slit
-Α Reference length …… Reference value L of the whole length of the raw material Reference effective length …… Reference value L 'of the length effective for the slit =
L-β ・ Products …… Products ……………………………………………………………………………………………………………………………………………………………. Slit width ...... Actual product width including additional lines Slit length ...... Actual product length including additional lines Number of units ...... Upper limit of number of units (number of stages) Minimum required number of units ...... Lower limit of number of units Specified value relationship: Numerical value used as a selection criterion for calculation results Yield: Product production / raw material used (based on area) Allowable yield I initial value: Lateral yield standard initial value Allowable yield II initial Value …… Initial value of lateral yield standard when width count is exceeded Allowable yield III …… Standard yield value ・ Work standard time …… Standard time for slitting work Slit time Machine working time Paper core change time Setup time for product changeover Material change time Setup time for material changeover Width change time Setup time for horizontal pattern change In step S2, the above-mentioned step S1 is performed. Select the data necessary for the calculation for slitting the web from the data read in. That is, the same type, thickness, and slit length of the raw material are subjected to slit calculation.

In step S3, the initial value of the allowable yield I and the initial value of the allowable yield II are set as the allowable yield I and the allowable yield II, respectively. The allowable yield III is the allowable yield I in this embodiment.
, But may be set to an arbitrary value of III <I according to the necessity of the yield. In this embodiment, the term “yield” refers to a numerical value obtained by multiplying the number obtained by dividing the total width of the raw material in the horizontal direction by the reference effective width of the raw material by 100. The yield is 100 divided by the total width of the finished product on the raw material divided by the reference width of the raw material.
May be used. Allowable yield I, II and II
I is the permissible yield to be compared when the yield calculation is performed early in the flowchart, when it is performed in the middle period, and when it is performed in the latter period, respectively.
0> II ≧ I, and initially set to a value as close to 100 as possible.

Step S4 corresponds to step S12 in FIG. In step S4, the pattern creation target is the first layer in the longitudinal direction of the raw material. Here, the “vertical layer” refers to a horizontal row having a predetermined number of steps in the vertical direction of the raw material. When the pattern creation target is the first layer in the vertical direction, when there is no pattern stored in the first layer of pattern creation and the last layer of pattern creation, and the pattern is still larger than 0 even if the allowable yield is reduced. (See step S30).

Step S5 corresponds to step 13 in FIG. In steps S5 to S21, pattern creation for each layer in the vertical direction is executed by repetitive processing. In step S5, when the process shifts from step S21 to step S5, the predetermined number of steps is the maximum number of one type of remaining product in the corresponding vertical layer and the number of steps of the layer immediately before the relevant vertical layer. Is selected as the number of steps in the layer. When the process shifts from step S4 to step S5, since there is no layer before the corresponding vertical layer,
The maximum number of remaining products in the first layer is defined as the number of steps in that layer.

For example, as shown in FIG. 12, from a raw material having a reference effective width W ′ of 3000 mm, a slit width of 300 mm
30 products and 60 products with slit width 400mm
A case in which only 20 products having a slit width of 500 mm are slit will be described. In this case, the maximum value of the number of remaining products, that is, the number of products to be slit from now on is 6
Since it is 0, the number of steps of the first layer is set to 60 in step S5.

Steps S6 to S13 correspond to step 14 in FIG. In step S6, the value obtained by dividing the number of products by the number of stages in the vertical direction (60 in this case) and rounding down the decimal point is used as the width width width number of the product, and the horizontal width width length is calculated. In the example of FIG. 12, the number of horizontal widths of only products having a slit width of 400 mm is 60 / the number of vertical steps 60 = 1, and the number of horizontal widths of other products is all zero. Therefore, the total width in the horizontal direction is 400 m
m × 1 = 400 mm.

In step S7, the total width in the horizontal direction is compared with the reference effective width W 'of the raw material. By this comparison, it is determined whether or not the total width in the lateral direction has become longer than the original reference effective width W ′. In the example of FIG. 12, the raw material reference effective width W ′ is 3000 mm, and the total width in the horizontal direction is 4 mm.
Since it is 00 mm, it can be seen that the overall width in the horizontal direction is within the effective reference width of the raw material.
Calculate%｝. The lateral yield in the case of FIG.
/3000)×100=13.3%, and 3
000/400 = 2600 mm remains.

Next, in step S14 (corresponding to step 15 in FIG. 1), the allowable yield I is compared with the yield calculated in step S13. If the yield is smaller than the allowable yield I, the yield of the slits at the number of steps set in step S5 is poor and the slit does not reach the allowable yield I, so that step S17 (corresponding to step 16 in FIG. 1) is performed. Moving on, the number of vertical steps in this layer is reduced by one. In the example of FIG. 12, the number of vertical steps 60 is changed to 59 as shown in FIG. Then, steps S6 to S17 are repeated. In the case of FIG. 13 as well, the horizontal yield is 13.3% and the number of vertical steps is 58%.
And steps S6 to S17 are repeated. Less than,
Similarly, steps S6 to S17 are repeated unless the total width in the horizontal direction does not exceed the original reference width W 'in step S7 and the lateral yield does not exceed the allowable yield I. FIG. 14 shows how the number of vertical steps is sequentially reduced in this way, and the total width in the horizontal direction when the number of vertical steps becomes 30 in step S6 is 300 mm × 1 + 400 mm × 1 =
This shows a state of 700 mm. The lateral yield in this case is (700/3000) × 100% = 23.3%
And still less than the allowable yield I. further,
As the number of steps in the vertical direction is reduced, the total width in the horizontal direction eventually exceeds the original reference effective width W ′. This is illustrated in FIG. In FIG. 15, the total width is 300 × 2 + 400 × 5 + 500 × 1 = 3100 mm
And the lateral yield is (3100/3000) × 100
= 103.3%. When determining whether or not the total width in the horizontal direction exceeds the raw reference effective width by comparing yields, it is a comparison of natural numbers including decimals, which is not appropriate for computer calculations. In the embodiment, the raw fabric reference effective width W 'is directly compared with the total width in the horizontal direction. In the example of FIG. 15, the raw material reference effective width W ′ is 3000
mm and the total width in the horizontal direction is 3100 mm, so the difference is $ 100 mm. When the raw material reference effective width minus the total width in the horizontal direction becomes negative, the process proceeds from step S7 to step S7.
8 and changing the combination of the horizontal width of each product within the range of the horizontal width of each product, and changing the total width in the horizontal direction and the effective width W 'of the web for each pattern. Steps S8 and S9 are repeated until the total width in the horizontal direction becomes smaller than or equal to the effective web width W '. For example, in the case of FIG. 14, the lateral width numbers of products having slit widths of 300 mm, 400 mm, and 500 mm are 1, 1, and 0, respectively.
For the possible combinations within the range of the width in the horizontal direction,
Steps S8 and S9 are repeated until the total width in the horizontal direction becomes equal to or less than the effective web width W '. More specifically, in the above combination, the lateral yield is compared with the allowable yield II by sequentially changing the width from the larger slit width. The combinations of the lateral width numbers obtained by this change are (1, 0, 0), (0, 0, 0), and (0, 1, 0).

When the total width in the horizontal direction becomes equal to or less than the effective width of the raw material in step S9, the lateral yield in this combination is calculated in step S10, and the lateral yield is allowed in step S11. Compare with Lateral yield is acceptable yield
If it is less than II, the process returns to step S8. If the lateral yield is larger than the allowable yield II, the combination at this time is selected in step S12, and the lateral yield is calculated in step S13 (although it has already been calculated in step S10,
Calculate again at 11. The lateral yield calculated in step S10 may be stored in a register, and may be read out in step S13. ). In the combination example shown in FIG. 16, the width of the slit width of 300 mm is set to 2 and 40
The case where the width of the slit width of 0 mm is 5 and the width of the slit width of 500 mm is 0 is shown, and the total width at this time is 300 × 2 + 400 × 5 = 2600 m
m and the lateral yield is (2600/3000) × 10
0 = 86.7%. In the combination example shown in FIG. 17, the width of 300 mm is 1, the width of 400 mm is 5,
The width of 500 mm is 1. At this time, the overall width is 2800 mm, and the lateral yield is 93.3%.
If the allowable yield II is set to 93.3% or less, FIG.
Is selected as the cutting pattern of the raw material. Next, step S14 (step 15 in FIG. 1)
If the yield calculated in step S13 is equal to or greater than the allowable yield I, the yield is a satisfactory yield, and therefore, step S15
Proceed to. In step S15, the combination of the patterns up to the previous layer and the combination of the current pattern are compared. Since there is no previous layer in the first layer, there is always a mismatch. When returning from step S21 to step S5, since the cutting pattern has been created for the second layer or higher, the pattern of the previous layer has been selected in step S18, but the selected pattern and the pattern of the current layer have been selected. Will be compared with As a result of this comparison, if the pattern is the same as any one of the patterns of the previous layer, the pattern of the previous layer of the same pattern for which the yield has already been calculated is set as a cutting pattern creation target again in step S16, and the vertical direction is determined in step S17. The number of stages is reduced by 1, and the process returns to step S6. That is, what is performed in steps S15 to S17 is that the same pattern as the pattern of the selected layer is found in another layer, so that the step number is reduced again by reducing the number of steps in the once selected pattern. In order to find a better yield pattern exceeding the yield I, the pattern of the previous layer is to be created again. That is, the fact that the same pattern as the pattern of the once selected layer is found in another layer means that the same calculation as the above-mentioned calculation in the once selected layer is performed in the above-mentioned another layer unless steps S15 to S17 are performed. This means that not only the calculation is wasted, but also that the pattern in the once selected layer has room for further improving the yield. For this reason, in this embodiment, a pattern with a higher yield is found by further changing the pattern in the layer once selected.

If the result of the comparison in step S15 is that there is no match with any of the patterns in the preceding layer, the flow proceeds to step S18 (corresponding to step 17 in FIG. 1), the current horizontal combination pattern is selected, and the number of remaining products is determined. Calculate the yield of In the first layer in the vertical direction, there is no previous layer, and therefore, there is no match, and the process jumps to step S18. For example, when the pattern in the case of FIG. 17 is selected, the widths of the slit widths of 300 mm, 400 mm, and 500 mm are 1, 5, and 1, and the number of remaining products is (3
0-12 × 1) = 18, (60-12 × 5) = 0, (2
0-12 × 1) = 8. The yield when the number of remaining products is simply arranged horizontally as a single layer pattern consisting of only one stage, that is, the yield with respect to the number of remaining products is ｛(300 ×
18 + 400 × 0 + 500 × 8) / 3000｝ × 100
Becomes In step S19, the yield for the remaining number of products is compared with the allowable yield I. The yield for the number of remaining products in the above case is clearly larger than the allowable yield I. This indicates that one more layer can be formed only by the number of remaining products. Therefore, step S21 (step 1 in FIG. 1)
9), the number of vertical layers is increased by 1, and the process returns to step S5. In step S5, the smaller of the number 18 of the remaining number of products and the number of steps 12 in the previous layer, that is, 12 is selected as the number of steps in the current layer.
In steps S19 to S19, the same processing as described above is performed. By repeating the above process, as shown in FIG. 16, first, when the number of steps in the second layer is set to 12, as shown in FIG. 16, only the slit width 300 is 1 and the remaining slit width is 1. The width number becomes zero. This gives a lateral yield of 10%
Therefore, if the number of vertical steps is reduced by one in step S21 and the same processing as that of the first layer is performed, finally, FIG.
As shown in (1), the lateral yield is 156.7% (the effective width of the raw material minus the width of the entire width is minus), which exceeds the effective width of the raw material. Therefore, in step S8, the combination of the width-direction width numbers is changed within the range of 9, 0, and 4, and as shown in FIG. Find out 3. The yield in the case of FIG.
0.0%.

If it is determined in step S19 that the yield with respect to the number of remaining products is smaller than the allowable yield I, it is impossible to cut the remaining product within one standard layer within the standard effective width of 3000 mm or more. You can see that there is. In this case, the horizontal combination selected in step S18 is set as the last layer combination, and in step S20, the total product width is compared with the minimum required number. The minimum required number is the minimum number required by the order, and is stored in the data storage device 2 in advance.
04. The minimum required number is not the one required by the order but may be the minimum required number. As a result of this comparison, if the total number of product widths is less than the minimum required number, the number of width-width products is insufficient, so the vertical layer is advanced by one in step S21, and steps S5 to S20 are performed. repeat.

Steps S22 to S24 correspond to step 20 in FIG. If the total number of product widths is equal to or greater than the minimum required number in step S20, the flow advances to step S22 to calculate the total yield and total working time from the raw material data and the slit pattern data. The total yield is represented by (sum of total width of each layer / effective width of raw fabric × number of layers) × 100. The total work time is slit time (number of product stages x machine operation time of product one-stage slit), paper tube replacement time (setup time for replacing paper tube at the time of product replacement), raw material replacement time (insufficient raw material) In this case, it is the sum of the setup time at the time of switching to a new raw material) and the width change time (the setup time required to move the position of the cutter when changing the horizontal pattern). One product corresponds to one step of one slit width. Therefore, each time the step changes, the product changes and the paper tube needs to be replaced.

If there is the pattern data saved by the previous pattern calculation, then step S2
In 3, the total work time of the current pattern is less than or equal to the total work time of the previously stored pattern, and in step S 24, the total yield of the current pattern is smaller than the total yield of the previously stored pattern. If it is larger, the current pattern is better than the previously stored pattern, so the stored pattern data is updated in step S25.

In the case of the first time where the previous pattern is not stored, the current pattern data is stored. In step S23, if the current total work time is longer than the total work time based on the previous pattern, if the total yield based on the previous pattern is greater than or equal to the current total yield in step S24, or if the pattern data is determined in step S25. In this case, in order to find a pattern having a shorter total working time and a larger total yield by further changing the current pattern, the pattern creation target is determined in step S26 (corresponding to step 22 in FIG. 1). Return the layer to the first layer and reduce the number of steps by one. Then, step S
At 27 (corresponding to step 23 in FIG. 1), the number of stages is compared with 1, and if the number of stages is 1 or more, the process returns to step S6 and the above processing is repeated.

If the number of stages is smaller than 1 in step S27, there is no longer any number of stages to be processed.
The process proceeds to (corresponds to step 24 in FIG. 1) and the presence or absence of the stored pattern is detected. If there is a stored pattern, the process ends. The saved pattern is stored in the data storage device 204 (see FIG. 2). Control device 20
Then, the storage pattern data is read out from the data storage device 204 as needed, and the original is cut by controlling the cutting device 207 based on the storage pattern data.

If there is no pattern to be saved,
In step S29 (corresponding to step 25 in FIG. 1), the allowable yields I and II are reduced, and in step S30 (corresponding to step 26 in FIG. 1), the allowable yield is compared with zero. If large, the process returns to step S4 and returns to step S4
Is repeated. When the allowable yield becomes 0 or less, the process is terminated assuming that no cuttable pattern exists.

Each product cut in the cutting pattern obtained by the method described with reference to FIGS. 7 to 11 may be further divided into two parts, four parts, or 10 m or 20 m as necessary. It may be used after being cut into pieces. In the above embodiment of the present invention, the case where a plastic film such as polyvinyl chloride is used as the raw material of the raw material has been described, but as the raw material of the raw material, for example, paper, synthetic paper, polyester, polyethylene,
The present invention is applicable to any other material that can be formed into a sheet, such as a metal plate.

[0035]

As is apparent from the above description, according to the present invention, when a required number of webs are cut with a slit width corresponding to an order or a prospective production, a product is cut in a pattern of a layer being formed. When the yield exceeds the allowable yield, the pattern is selected, and if a pattern having a better overall yield and a shorter working time for cutting than the already saved pattern is found, the pattern is saved. Since the existing pattern is updated with a new pattern, it is possible to automatically create a high-yield sheet cutting pattern in a short time without any labor. In addition, by operating a control device such as a sequencer using the sheet cutting pattern created according to the present invention to control the sheet cutting device, it is possible to automatically cut a sheet with a high yield in a short time. .

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating the principle of the present invention.

FIG. 2 is a configuration diagram of a computer system used in an embodiment of the present invention.

FIG. 3 is a perspective view of a polyvinyl chloride sheet applied to an embodiment of the present invention, which is wound into a roll.

FIG. 4 is a diagram for comparing cutting patterns.

FIG. 5 is a plan view schematically showing a sheet cutting pattern according to an embodiment of the present invention.

FIG. 6 is a side view of the sheet cutting device used in the embodiment of the present invention.

FIG. 7 is a part of a flowchart illustrating a method for creating a sheet cutting pattern according to an embodiment of the present invention.

FIG. 8 is another part of the flowchart for explaining the method of forming a sheet cutting pattern according to the embodiment of the present invention.

FIG. 9 is still another part of the flowchart for explaining the method of forming a sheet cutting pattern according to the embodiment of the present invention.

FIG. 10 is still another part of the flowchart for explaining the method of forming a sheet cutting pattern according to the embodiment of the present invention.

FIG. 11 is still another part of the flowchart for explaining the method of forming a sheet cutting pattern according to the embodiment of the present invention.

FIG. 12 is a diagram illustrating a part of the process of creating a sheet cutting pattern according to an embodiment of the present invention.

FIG. 13 is an explanatory diagram of another part of the creation process of the sheet cutting pattern according to the embodiment of the present invention.

FIG. 14 is an explanatory diagram of still another part of the creation process of the sheet cutting pattern according to the embodiment of the present invention.

FIG. 15 is an explanatory diagram of still another part of the creation process of the sheet cutting pattern according to the embodiment of the present invention.

FIG. 16 is an explanatory diagram of still another part of the creation process of the sheet cutting pattern according to the embodiment of the present invention.

FIG. 17 is an explanatory diagram of still another part of the creation process of the sheet cutting pattern according to the embodiment of the present invention.

FIG. 18 is a diagram illustrating still another part of the progress of creating a sheet cutting pattern according to an embodiment of the present invention.

FIG. 19 is a diagram illustrating still another part of the progress of creating a sheet cutting pattern according to an embodiment of the present invention.

FIG. 20 is an explanatory diagram of still another part of the creation process of the sheet cutting pattern according to the embodiment of the present invention.

[Explanation of symbols]

201 central processing unit (CPU) 202 input device 203 program storage device 204 data storage device 205 display device 206 control device 207 cutting device 1 sheet W reference value of full width of raw material W 'reference validity width a, b, c, ... width h _1, h ₂ ... number L ... reference length L '... reference effective length of raw original fabric layers of products

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B26D 5/00 G06F 19/00 B23D 36/00 501

Claims (4)

(57) [Claims] 1. From a sheet having a constant width in the horizontal direction, a plurality of types of products having different widths and lengths are selected so that each of the plurality of types of products has a width specified in the horizontal direction. A pattern making method for only cutting, wherein the pattern has at least one layer in a vertical direction, each of the layers has at least one step in a vertical direction, and a horizontal direction of the pattern. For each layer, a width according to the type of the product is taken, and each of the steps in the section of the width represents one product corresponding to the width, and the pattern of the layer being created is Select the pattern when the product cutting yield exceeds the allowable yield, and save it when a pattern that has a better overall yield than the already saved pattern and requires less time for cutting is selected. New patterns A method for creating a sheet cutting pattern, comprising the step of updating with a selected pattern. 2. From a sheet having a constant width in the horizontal direction, a plurality of types of products having different widths and lengths are set so that each of the plurality of types of products has a width specified in the horizontal direction. A sheet cutting pattern for cutting only, wherein the sheet cutting pattern has at least one layer in a longitudinal direction, and each of the layers has at least one step in a longitudinal direction. The width is determined according to the type of the product for each layer in the lateral direction of the sheet cutting pattern, and each of the steps in the section of the width represents one product corresponding to the width. In the case where the yield of product cutting in the pattern of the layer being created exceeds the allowable yield, that pattern is selected, the overall yield is better than the already stored pattern, and the work time required for cutting is selected. Select a short pattern In this case, the stored pattern is updated with the newly selected pattern to obtain the sheet cutting pattern, and the sheet cutting device is controlled based on the sheet cutting pattern to cut the sheet. A sheet cutting method, characterized in that: 3. From a sheet having a constant width in the horizontal direction, a plurality of products having different widths and lengths are selected so that each of the plurality of products has a width specified in the horizontal direction. Only a pattern for cutting, wherein the pattern has at least one layer in the longitudinal direction, each of the layers has at least one step in the longitudinal direction,
In the width direction of the pattern, a width corresponding to the type of the product is taken for each layer, and each of the steps in the section of the width represents one product corresponding to the width, and The pattern creation method includes: (a) a step (11) for setting an allowable yield and a minimum required number; (b) a step (12) in which the layer for which the pattern is to be created is the first layer; and (c) the number of layers. (13) (d) the number of rows of each product to be cut, the smaller of the number of rows of the front layer and the maximum number of pieces of each product to be cut in the longitudinal direction of the sheet. (14) determining the width combination of each product in the layer to be created by determining the number of horizontal widths of each product based on the number of steps, (e) determining the total width in the horizontal direction. A step for comparing the lateral yield obtained by dividing by the width of the sheet with the allowable yield. Flop (15), (vi) if said lateral yield is less than the allowable yield is decreased by one the number of stages of the creation target layer step (1
4) returning step (16); (g) when the lateral yield is equal to or higher than the allowable yield and does not match the combination of the lateral width numbers up to the previous layer, The combination is selected as the pattern of the layer, and if they match, the process returns to the step (f) (17). (H) The step of comparing the number of all products of the already selected pattern with the minimum required number (18) (I) When the number of all products of the pattern already selected in the step (h) is less than the minimum required number,
A step (19) in which the processing target layer is advanced by one so that the processing of the remaining number of products is formed in the next layer, and the process returns to the step (c); (nu) all of the patterns already selected in the step (h); If the number of products is equal to or greater than the minimum required number, the pattern between the last saved pattern and the currently selected pattern is
(E) comparing the total yield indicating the ratio of the horizontal width of the pattern to the horizontal width of the sheet with the cutting operation time indicating the total operation time required for cutting the sheet based on the pattern; If the total yield and cutting work time of the previously saved pattern is better than the total yield and cutting work time of the pattern selected this time, the step of rewriting the previously saved pattern with the currently selected pattern (2)
1), (W) If the total yield and cutting work time of the previously stored pattern is worse than the total yield and cutting work time of the pattern selected this time, the target layer is returned to one layer and the number of steps is reduced by 1 from the number of steps. (22), (f) comparing the number of steps with 1; if the number of steps is 1 or more, returning to step (c); (23); (g) saving if the number of steps is less than 1 in step (f) Determining the presence or absence of the stored pattern, and ending the process if the stored pattern exists (24); (t) reducing the allowable yield if the pattern stored in step (f) does not exist; A step (25, 26) for terminating the process if the allowable yield becomes 0 or less, and returning to step (c) if the allowable yield is greater than 0. One . 4. From a sheet having a constant width in the horizontal direction, a plurality of products having different widths and lengths are designated such that each of the plurality of types of products has a width specified in the horizontal direction. (A) setting a first allowable yield and a second allowable yield larger than the first allowable yield (S3), and (b) a front layer. And the maximum number of pieces to be cut of each product in the longitudinal direction of the sheet, the smaller number of the steps, and the sheet has a width substantially equal to a constant width of the sheet in the lateral direction. Constructing a layer having a width equal to
(4) S5), (c) The number of products to be cut is divided by the number of stages, and the fractional part of the quotient is truncated to obtain the horizontal width of each product. (S6) to obtain the total width in the horizontal direction by adding the product of the width and the number of widths in all the products (S6). (S7), (e) when the total width in the horizontal direction is larger than the width of the sheet in the step (d), the horizontal width is set to be smaller than the width of the sheet. (S7, S8, S9) to change the width in the direction, and (f) dividing the total width in the width in the transverse direction changed by the step to change the width in the horizontal direction by the width of the sheet. (G) obtaining the lateral yield in the second allowable range. If the lateral yield is lower than the second allowable yield, the process returns to step (e), and if the lateral yield is higher than the second allowable yield, or if the lateral yield is lower than the second allowable yield. )), When the total width in the horizontal direction is equal to or less than the width of the sheet, calculating the horizontal yield in the combination of the horizontal width numbers at that time (S13); If the lateral yield calculated in step (b) is smaller than the first allowable yield, the step (S) of reducing the number of stages selected in step (b) by 1
(14) S17), (i) If the lateral yield calculated in the step (f) is equal to or more than the first allowable yield and coincides with the combination of the lateral widths taken up to the previous layer, (S14 to S17) reducing the number of steps of the previous layer by 1 as the calculation object of the matched previous layer, (nu) the lateral yield calculated in the step (f) is equal to or more than the first allowable yield If the combination does not match the horizontal width count up to the previous layer, the combination of the horizontal width counts at that time is selected as the pattern of the layer, and the remaining number of products is set to one level of the next layer. (S18), calculating the lateral yield by patterning according to (1), (E) comparing the lateral yield calculated in the step (nu) with the first allowable yield, (S19), B) In the step (e), the lateral yield is When the yield is smaller than the first allowable yield, comparing the number of all products of the already selected pattern with the minimum required number (S20); When the yield is equal to or more than the first allowable yield or when the number of all products of the pattern already selected in the step (W) is smaller than the minimum required number, the processing of the remaining number of products is performed in the next layer. Step (S21), which advances the layer to be processed by one and returns to step (b); (G) If the number of all products of the pattern already selected in step (W) is equal to or greater than the minimum required number, the pattern is already selected (S22) calculating the total yield indicating the working time required for sheet cutting and the ratio of the horizontal width of the pattern to the horizontal width of the sheet based on the pattern obtained. If the time is longer than the working time based on the pattern saved in the previous processing, or if the total yield is lower than the second allowable yield, the processing target layer is returned to the first layer and the first processing is performed. Reduce the number of layers in the layer by one,
(S23, S24, S26, S27) returning to step (c) when the number of steps is 1 or more; (v) when the working time is less than or equal to the working time based on the pattern selected in the previous processing; If the total yield is larger than the second allowable yield, the pattern data stored in the previous processing is updated with the pattern data of the layer, and the step (S) is performed as a real layer (S).
23-S27), (S) When the number of steps in the first layer is 1 or less, it is determined whether or not there is a stored pattern, and if there is a stored pattern, the process is terminated (S28). If the stored pattern does not exist in the step (S), the first and second allowable yields are reduced, and the process ends when the first and second allowable yields become 0 or less. And a step (S29, S30) of returning to step (b) if the value is larger than 0.