JP2515192B2 - Control method of cutting device in corrugator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device control method for reducing the number of defective sheets generated in a corrugator as much as possible.

[0002]

2. Description of the Related Art As is well known, a corrugator includes a laminating device composed of a single facer, a double facer, and the like.
The cutting device is composed of a slitter and a cutter, but the following loss occurs during the operation of this corrugator. The loss that occurs can be roughly divided into so-called work loss and unavoidable loss according to the nature.The former is a defective sheet due to machine defects such as sheet warpage and adhesion failure, and inadequate work operation. -The loss that occurs at a much higher rate than the work loss is so-called unavoidable loss. This unavoidable loss is a defect of the splicing part due to the lot change, a defect due to the order change of the slitter scorer, a defect due to the splicing of the replenishment paper, etc. These can be reduced by the efforts of the workers. Impossible and the overall loss rate is 60
It occupies about%. In order to significantly reduce the above-mentioned unavoidable loss, the present invention controls the cutting device, which is the location where the loss occurs, by a novel method as described below.

A proposal for reducing the unavoidable loss as much as possible is disclosed in Japanese Patent Laid-Open Nos. 1-168989 and 3066.
Is also Ru known Tei by 97 JP etc., technical contents disclosed in these publications are very ideally as described below, unclear solutions for practical ways to reduce the inevitable loss There was a problem that was. That is, the former method detects the line speed of the corrugator and then detects the paper splice part with the minimum cutting length of the cutter corresponding to this line speed as the specified cutting length, and then the detection position reaches the cutter position. Only the disclosure of activating the cutter at that time is allowed, and there is no teaching as to how to deal with a plurality of paper splicing portions that exist in close proximity to each other as a practical problem. Therefore, there are many problems to be solved when it is carried out commercially, and on top of that, there is no disclosure of a solution to the order change of the slitter scorer, which must be solved at the same time as the paper change.

On the other hand, the latter method is intended to minimize the loss caused by the order change, but since the means has the following structure,
It is not always possible to achieve the intended effect. That is, in the latter conventional method, the operating speed V of the corrugator at the time of switching the slitter-scorer is detected, and this operating speed and the head of the slitter-scorer make the above-mentioned operation.
The time t required from approaching or leaving the sheet after receiving the dare signal is selected as a factor, and the estimated length of the defective sheet expected to occur is calculated from that value. The estimated length is input to the cutter as the designated cutting length, and the sheet is cut and removed at the designated cutting length when the order change point reaches the cutter position. . Therefore, when the operating speed is 200 m / min, it takes about 1 second to switch the slitter-scoring head, and in that case, the length of the defective sheet is 3.
The length is 33m, which is inevitable that the conventional method exceeds 3.0m.

In addition, each of the above-mentioned conventional methods is a method of operating a device such as a cutter by performing signal processing in accordance with separate configurations for replacement paper replacement and slitter scorer order replacement. However, since a solution for uniformly treating the both is not disclosed, it cannot be practically used as a commercial corrugator. In other words, when the corrugator is actually operated, the above-described replenishment paper change and order change are often combined, so that it is possible to cope with any of the above and at the same time both It is not practical without developing a solution.

[0006]

DISCLOSURE OF THE INVENTION In the present invention, not only replacement of replenishment paper due to consumption of roll-shaped base paper but also order replacement of slitter scorer and further corrugated ball sheet -To develop a cutting control method that makes it possible to control all of the constituent base papers in a unified manner even in the case of lot change in which all of the constituent base papers are exchanged. , And presents means for solving the problem by further reducing the loss rate. In particular, according to the present invention, no matter where the defective portion due to paper splicing or the like exists, the defective sheet is cut off with a minimum length including the defective portion. The purpose of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a corrugated core paper 2 as an example.
Multi-sided double-sided ball sheet composed of 1 sheet and 3 sheets of liner paper
FIG. 11 is a plan view of 11. Now, if a lot is changed at the time of production for this sheet, in this case, it is necessary to replace each of the above five original fabrics with an original fabric that meets the new specifications. The paper splicing point has become
As indicated by reference numeral 12 in the figure, it occurs at five locations. In the drawing, the sheet 11a on the left side of the line indicated by the reference numeral 13 is the old lot, and the sheet 11b on the right side is the new lot,
The sheet flows from right to left in the figure. Since the five paper splicing portions 12 are all included in the new lot portion, the sheet 14 including these paper splicing portions 12 is included.
(Shown with hatching in the figure) must be removed as a so-called defective sheet.

When the defective sheet 14 is cut and removed, in the conventional method, the cutting is performed with a constant length dimension 1 (lowercase letter L, the same applies hereinafter) through the cutting line 13 by the cutter blade. As indicated by reference numeral 14b in FIG. 1, a non-defective portion over a considerable length was included in the defective sheet 14, and the amount of loss portion was increased more than necessary.
On the other hand, according to the present invention, as shown in FIG. 2, the cut portion 13a is cut immediately after the paper splicing portion 12a which is located furthest in the flow direction of the paper. Is intended not to occur.

The above is a description of the loss that occurs during so-called "lot change". Lot change means the grade of roll-shaped base paper which is the main raw material of the corrugated ball.
Along with changing the basis weight and width, it also means changing the cutting size, makeup cutting and ruled line size. The situation of the loss caused by the "lot change" is "order change of slitter scorer" as shown in FIG. 3, that is, there is no change of the base paper and cutting is performed in the same base paper. The same applies to the case where the size and makeup are cut off and the ruled line size is changed, and moreover, “replacement paper replacement” as shown in FIG. 4, that is, one roll-shaped base paper is not sufficient, and therefore the same grade / tsubo is used. The same applies to "replacement paper replacement" in which base papers having different amounts and widths are replenished in the same lot.

As described above, the present invention is intended to greatly suppress the occurrence of unavoidable loss occurring in each of lot change, slitter scorer order change, and replenishment paper change, thereby significantly improving the yield. The purpose is.

[0010]

The present invention is a cutter 26.
And two tandem type slitter scorers A and B, and a pulse generator PG is provided between the cutter and the slitter scorer, and a paper splicing point is provided in front of the slitter scorer. In a corrugator equipped with a sensor 22 for detecting the pressure, l ₁ , l ₂ , L, L ₁ , L
₂ and △ PG ₁ ~ △ PG ₄ and as described below, and, below the by performing from consisting signal processing steps of corrugated and so as to resolve each problem - is a control method of the cutting off device in the data .

It has a cutter and two tandem type slitter scorers (abbreviated as Surisco), a pulse generator PG is provided between the cutter and Surisco, and a paper splicing point is detected in front of the Surisco. to corrugator odor fitted with sensors Te, so that can be processed also come continues plurality of defective parts, double
Equipped with a number of PG calculators,
At the same time as detecting the gap, activate the PG computing device,
The value of PG is read by the cutter cutting signal immediately after. Then read from the distance between the cutter and the sensor
By subtracting the PG value and dividing that value by the cutting dimension,
Get the quotient a and the margin b. Using the quotient a and the margin b obtained as described above,
The first sheet with a good sheet and the corrugated bow that will be cut
Calculate the distance from the leading edge of the sheet to the defective sheet. The control target sheet is defective obtained by the above calculated value
It is the first sheet with a sheet, and the cutting dimensions are
The distance calculated from the tip of the
Dimension calculated from good length or preset defective length
Disconnect with. When dividing by the above cutting dimension, order change, lot change
The cutting size will change at the time, but in the case of replenishing base paper in the same lot
The cutting dimension does not change, so this is calculated.
To control.

It has a cutter and two tandem type slitter scorers (abbreviated as Surisco), a pulse generator PG is provided between the cutter and Surisco, and a paper splicing point is detected in front of the Surisco. corrugator smell fitted with a sensor that Te, to detect the oN · OFF signal of Surisuko
To activate the PG calculation device, and use the cutter signal immediately after to operate P
The value of G is read by the arithmetic unit. Then read from the distance between the cutter and Srisco
The PG value is subtracted and the value is divided by the cutting dimension to obtain the quotient.
Get a and cob. Defect using the quotient a and the margin b obtained as described above
The sheet in which the sheet is present and the corrugated cardboard sheet that will be cut
Calculate the distance from the tip of the board to the defective sheet. The defective sheet obtained above is present on the first sheet to be controlled.
The cutting dimension is from the tip of the corrugated cardboard sheet.
The length of the defective sheet calculated in advance or the distance to the defective sheet
Cut with the dimension including the set defective length. When dividing by the above cutting dimension, order change, lot change
The cutting dimensions may change, but manually in the same lot and order
The cutting dimension does not change when Surisco is operated with
Therefore, control is performed so that this is determined by calculation.

Next, the cut size control target and the length signal of the defective sheet detected through the signal for detecting the presence or absence of the ON / OFF signal of the preceding stage or the subsequent stage SLISC are given as follows. if so guided in each step, the co <br/> and as possible out to cutting off a plurality of defective sheets arriving in succession at the maximum cutting dimension in the maximum sheet, when cutting off, in the cutting dimension control object The sheet can be cut by determining whether or not the maximum cutting size is within the minimum cutting size Q at the current line speed. The steps in that case are described below. (A) The cutter cutting signal is subtracted based on the cutting dimension control target signal. (B) It is determined that the number of sheets when the cutting dimension control target signal reaches the cutter position is a specific number, and the signal is sent to the preceding step until the cutting dimension control target signal reaches the specific sheet. return. (C) After discriminating the signal of the specific sheet, the one having the largest number of cut sheets is selected from the plurality of signals for controlling the cutting dimension. (D) Select the one with the largest cutting size among the largest sheets. (E) Compare the signal with the maximum cutting size among the largest sheets with the signal with the minimum cutting size at the current line speed. If the signal fits within this size, cut the defective sheet with that size, and do not fit on the other hand. In this case, the defective sheet is cut into the largest sheet with the maximum cutting dimension.

If the above-mentioned means are adopted, the current line speed in consideration of the cutting size restriction (minimum cutting size based on the performance of the cutter) by the line speed of the corrugator is adopted.
Depending on the minimum cutting size of the cutter in the
The cutting sheet is cut into pieces, and on the other hand, when the cutting target does not fit within the minimum cutting size of the cutter, the defective sheet is cut into the specified maximum cutting size. It is intended to achieve the purpose of.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 5 is a block diagram showing an example of an apparatus used for carrying out the present method.
21 is a corrugated core paper with a liner attached to the corrugated core paper.
The double facer, 22 for manufacturing the sheet is for detecting the passage of the splicing mark (usually silver paper is attached to the splicing part) applied to the splicing part. Of the silver paper sensor, which generates one pulse every time the silver paper passes. Reference numerals 23 and 24 are slitter scorers for continuously forming slits and ruled lines with respect to the stepped ball sheet, and are slitters having the same structure.
Scorers are provided in tandem in two sets in front and back with respect to the flow direction of the sheet, and are used by alternately switching. In addition,
The slitter-scorer 23 located at the front is represented by (A) in the figure, and the slitter-scorer 24 located at the rear is (B).
Indicated by. One of the two sets of slitter-scorer 23 and 24 before and after is used according to the switching signal of the slitter-scorer, and in the example shown in the figure, the rear slitter-scorer 23 is in the use state. It indicates that Reference numeral 25 is a pulse generator (hereinafter sometimes abbreviated as PG) which rotates in contact with the running seat, and as one example, generates one pulse every 1 mm of the movement of the seat. It is configured as follows. 26 is
A cutter for cutting the sheet at a right angle to the flow direction, and 26a is a blade attached to the cutter. Further, the cutter 26 incorporates a disconnection signal sensor indicated by reference numeral 27 in the drawing, and the sensor generates one pulse each time it is cut (every time the cutter makes one rotation). , And outputs the pulse signal to the arithmetic unit 28 described later. A ROM in which a program as shown in the flowchart of FIG. 8 is written is built in this arithmetic unit. Numeral 29 is a device for ejecting a defective sheet provided behind the cutter 26, and numeral 30 is a number management device, which manages the remaining number on the premise of the order number initially set and input. It is a device that does. A bounce signal from the bounce device is introduced into this device, and a correction value obtained by subtracting the number of defective sheets is always calculated, and the remaining number is managed based on the calculated correction value.

Incidentally, the installation position of the silver paper sensor 22 will be described. Although the sensor is located immediately before the slitter scorer, it is not always necessary to be at this position, and the installation position of the cutter is not always required. It can be installed at any position in front of the product, specifically, as long as a distance of at least twice the maximum cutting length of the corrugated ball sheet as the product is maintained.

In the above apparatus, first, the case where the number of the silver paper 15 passing through the above-mentioned silver paper sensor 22 is one will be described. This case corresponds to the case of "replacement paper replacement" in FIG. 3 described above, and the details thereof will be specifically described with reference to FIGS. As already mentioned, "refill paper replacement"
This is because one of the constituent base papers of the corrugated ball sheet is completely consumed and a new base paper having the same grade, basis weight and width is replenished in the same lot. All the subsequent replenishment paper including the silver paper 15 which is the splicing portion will be cut at the current lot size (l ₁ ). Therefore, in this case, the distance L between the cutter 26 and the silver paper sensor-22 is L.
As shown in FIG. 6, L <l ₁ × n (where n is the number of sheets remaining until the lot is changed).
Therefore, in the present invention, the sensor 22 detects the silver paper 15, and at the same time, the addition by the pulse generator (hereinafter sometimes abbreviated as PG) 25 is started (see the flow chart of FIG. 8).
The chart is introduced into the arithmetic unit 28.

By the way, the pulse generator 25 is
Counting is started at the start of operation, and it is operated to manage the set number of sheets and the remaining number of sheets according to it, and in parallel with this, at the same time as the sensor of the silver paper 15 passes, separately described as ΔPG ₁ and ΔPG ₂ etc. Is started to be added.

On the other hand, the cutter 26 is provided with a disconnection signal sensor 27 which generates one pulse for each rotation.
Since it is constantly introduced into the arithmetic unit 28, as described above, the cutter cutting signal immediately after the silver paper 15 has passed the silver paper sensor 22 is taken out, and by this signal, ΔPG ₁ , shown in FIG.
That is, to be precise, after the next cutter signal is input, the counter (not shown) sets the distance that the paper sheet moves from the sensor 22 as the starting point of the silver paper 15 which is the paper splicing point to ΔPG _1. ).

ΔP which is the value read in this way
When the distance G ₁ has a relationship of L <l ₁ × n (when replacing supplementary paper), the determinations shown in FIGS. 8 and 10 are made, and the sheet is set as described later. It cuts with the minimum length dimension.

This point will be described below with reference to the flow charts of FIGS. 8 and 10.
More specifically, based on the chart, step 1 in the figure (the numbers are circled in the figure; the same applies hereinafter) is silver paper detection, and based on that, the addition of the PG is started. (Step 2). In this step, "PG1,
PG2 addition start ”is displayed in addition to the start of addition of ΔPG ₁ mentioned above, and ΔPG ₂ (silver paper is 2
In the case where more than one piece continues, it means the distance between the first silver paper and the second silver paper) and the addition is started at the same time. As will be described later with reference to FIG. 7, step 3 shows an operating state when the second silver paper 15b following the first silver paper is detected by the sensor 22 before the cutter signal is input. In the case of the replacement paper replacement, since there is only one silver paper and there is no subsequent silver paper, N is determined in step 3, and the process proceeds to step 5 of the next stage. When the next silver sheet is detected before the cutter signal is input, the ΔP is set as shown in step 4.
G1 and .DELTA.PG2 are both reset, and by performing such an operation, the presence or absence of the cutter signal input is used as the reference for subsequent calculations.

When the cutter signal is input next time, the program proceeds to step 6 where the distance traveled by the base paper from the time when the silver paper is detected to the time when the cutter signal is input, that is, ΔPG ₁ is a counter. At the same time when it is read to −, ΔPG ₁ is reset.

By the way, in the case of replacement paper replacement,
As described above, since the relationship of L <l ₁ × n is always satisfied, the process proceeds to the step 8 via the N side of the step 7 in the next stage. However, in the case of replacement paper replacement, one silver paper is used. Since the next silver paper will not come, the process goes to step 9 through the N side of the same step. As shown, in step 9, ΔPG ₂ ≧
Although it is made to judge l ₁ × 2, it is equal to one silver paper and virtually no next silver paper when the replacement paper is replaced as described above, and therefore ΔPG ₂ is in the process of addition, In step 9, the Y side is discriminated, and in step 10 of the next stage, PG2 is reset.

Next, in step 11 of the next stage, the arithmetic unit 28 is made to perform the pre-programmed calculation shown in the figure, the quotient c and the remainder d are calculated, and the cutting dimension control target is determined from the values. It is determined that the sheet is the (c + 1) th sheet.

In cutting the control target sheet, as clearly shown in step 12 in the drawing, the margin value d is set to the margin length α of the defective portion, That is, it is set in advance so as to be cut by (d + α). This margin length α should be as short as possible, but it is possible to set it to at least about 50 to 100 mm in consideration of the attachment length of silver paper.

By the way, the cutter 26, which cuts the base paper or the sheet, has its own cutting limit dimension determined by the capability of the cutter for each line speed. Hereinafter, this point will be specifically described.

FIG. 12 shows an example of a capacity curve peculiar to a certain cutter. The vertical axis represents the line speed of the corrugator, and the cutting limit dimension of the cutter corresponding to the speed. (Minimum cutting dimension) Q is shown on the horizontal axis. In the example shown in the figure, when the line speed is 200 m / min, the cutting limit size is about 850 mm, and when the line speed is 225 m / min or more, the above value is about 933 mm, and for lengths below that value. It cannot be cut off. Also, the line speed is 225
If it is less than m / min, for example 100 m / min, the above Q is 600 mm. As described above, since the cutting limit dimension Q corresponding to the line speed is set in the cutter 26, the value is stored in the arithmetic unit 28 in advance. Based on this stored value, the magnitude of the value of (d + α) is compared. As a result, if (d + α) is within the numerical value of Q, the value of Q is cut off and the value of (d + α) is larger than Q. Is large, (d
The value is + α). In other words, assuming that the minimum cutting dimension of the cutter in the current line speed is Q, in the case of Q≤ (d + α), the control target sheet may be cut by (d + α). > (D +
In the case of α), if the sheet is cut with the minimum cutting dimension Q of the cutter in the current line speed, it is possible to cut the defective sheet with the above-mentioned unavoidable loss. Thus, the sheet can be cut with a length commensurate with the actual minimum size adapted to the capability of the cutter 26, so that loss can be minimized. Although the final processing is performed as described above, this will be mentioned later in the description of FIG. 10.

That is, as indicated by the symbols in FIG. 8, if the cutter 26 is operated through the signal after passing through step 12 in the same figure, the defective portion is thereby minimized. Can be cut off. However, the processing of the signal is shown in FIG.
Since the processing can be performed in accordance with the flow chart shown in, the case will be described later. Figure
The symbol 10 indicates the signal processing path corresponding to the symbol in FIG. 8, and the same applies to the symbols e and t-nu in FIG.

Prior to the description of FIG. 10, the remaining steps 14 to 18 in FIG. 8 will be described below.

The processing shown in step 14 and subsequent steps is processing corresponding to the paper splicing at the time of lot change shown in (a) and (c) of FIG. 6, and the point indicated by * in the figure is the lot change point. Since the silver paper 15 is present in the immediate vicinity of the lot change point in the same manner as described above, this silver paper is detected by the silver paper sensor 22 and the addition by the pulse generator 25 is started.

The following is a description based on the flowchart of FIG. 8. In steps 1 to 6, after the addition of PG ₁ and PG ₂ is started by the detection of silver paper, as in the above case,
Further, only when the cutter cutting signal comes in after that, ΔPG ₁ shown in C of FIG. 6 is read into the counter. Thus, the process proceeds to step 7. However, in the case of lot change, there is always a relationship of L ≧ l ₁ × n as apparent from FIG. Allow (step 14). Since the case of FIG. 6 is a case of one silver paper, the process proceeds to step 16 in the next stage, where ΔPG ₂ ≧ l ₂ × 2 is discriminated. As mentioned above, △ P
G ₂ means the distance between the first silver paper and the second silver paper, and in this case, the arrival of the second silver paper is being added, so the distance ΔPG ₂ is Naturally, it becomes larger than l ₂ × 2. Therefore, step 16
When the calculation device 28 calculates a value obtained by dividing L-ΔPG _1- (l ₁ × n) by l ₂ which is the new lot size, the quotient becomes a and the remainder becomes b, From that value, it is determined that the sheet to be cut size control target is the (n + a + 1) th sheet.

When cutting the control target sheet, the margin b is cut into a length in which the margin length α of the defective portion is taken into consideration, that is, (b + α), in the same manner as described above. Assuming that the cutting limit dimension of the current line speed of the corrugator in this case is Q,
<When (b + α), cut at the length of (b + α), Q>
In the case of (b + α), the same result as above can be obtained by cutting with the cutting limit dimension Q of the cutter.

The above-mentioned symbols are arranged and shown as follows.

L ₁ = current lot size, l ₂ : new lot size, α = defective part margin length, Q = cutting limit size of cutter at current line speed, L = distance between cutter 26 and silver paper sensor 22, ΔPG ₁ = Silver paper 15 indicating the paper splicing point is the silver paper sensor 2
The length of time after passing the position 2 and after the cutter signal is issued next time, ΔPG ₂ = distance between the first silver paper 15a and the second silver paper 15b, Is 1 silver paper
In the case of individual pieces (mainly in the case of replacement paper replacement, but rarely also in the case of lot replacement), the case of a plurality of silver paper sheets will be described next. In actual lot change or order change, there are overwhelmingly many cases in which there are a plurality of silver sheets. In its This, following this respect will be described with reference to FIGS. The first silver paper 15a among a plurality of silver papers
Is passed through the silver paper sensor 22, the PG
_The above description still applies in that the value of ΔPG ₁ is read into the counter when the addition of ₁ and PG2 is started and then the cutter cutting signal arrives. However, if multiple silver sheets are detected before the arrival of the cutter cut signal,
As specified as step 4, said PG ₁ and P
The operation state is slightly different from that described above in that G ₂ is reset and ΔPG ₁ is read by detecting the last silver sheet before the signal arrives.

Now, in step 7, the determination of L ≧ l ₁ × n is performed in the same manner as described above.
As is apparent from the above, in the same step, the Y side is selected and the next step 14 is reached, and unless the next silver paper is detected here, after that, the route of steps 15 to 18 described above is followed and the cutting size is determined. The sheet to be controlled is (n +
(a + 1) th sheet is discriminated, and the cutting dimension in that case is (b + α), and in this case, the cutting limiting dimension in the current line speed of the corrugator is Q.
Then, when Q <(b + α), the cutting is performed with the length of (b + α), and when Q> (b + α), the cutting is performed with the cutting limit dimension Q of the cutter.

By the way, when the next silver paper is detected in step 14, the PG
2 is reset and returns to step 2, and the above-mentioned processing is performed again. Thus, even when multiple silver papers (up to 5) arrive when changing lots or changing orders,
In the state of aiming at the silver paper that comes most later, the base paper or sheet is cut at the above-mentioned minimum cutting size.

Next, referring to FIGS. 9 and 11, a case will be described in which the unavoidable loss due to the size change of the slitter scorer (hereinafter abbreviated as Surisco) is minimized. As already mentioned, in "lot change" or "order change", in addition to changing the grade, basis weight, and width of the roll-shaped base paper, which is the main raw material of the corrugated ball, Often, the cutting size, makeup cutting and ruled line size are also changed. Of these, the cutting dimensions, makeup cutting, and ruled line dimensions are changed exclusively by Surisco.

As shown in FIG. 5 and FIG. 11, reference numerals 23 and 24 are provided for Surisco, and two Suriscoes A and B are provided in tandem on the same line. Now from A to B
Suppose you want to change the order. In the illustrated example, the front Surisco A emits an OFF signal and the rear Surisco B is located.
Is turned on, this on / off signal is introduced to the arithmetic unit 28 described above. Below, the method of signal processing after introduction is shown in FIG.
However, the symbols in the figure will be described before that.

L ₁ = distance from the center line of the front Surisco A to the cutter 26, L ₂ = distance from the center line of the rear Surisco B to the cutter 26, ΔPG ₃ = of the front Surisco A
The distance of the sheet moved from when the ON / OFF signal is issued until the next cut signal is issued, ΔPG
₄ = The distance of the sheet that has moved between when the ON / OFF signal of the rear Surisco B is issued and when the next cut signal is issued ((∆PG ₃ and △ PG ₄ are the normal automatic Although there is only a slight time lag in operation, in rare cases it may be operated by manual operation, and there are also cases where the front stage Surisco and the rear stage Surisco are operated at the same time. In FIG. 9, when the Surisco A in the previous stage is operating, if it is switched to the Surisco B in the latter stage by the order change command, the off signal, Surisco B is changed to the Surisco B in the Surisco A. In that case, the ON signal is emitted with a slight time lag. This case will be described below with reference to the flow chart of FIG. 9. First, in step 20, the off signal of Srisco A is used to set P in step 21.
The addition of G3 is started, and then it is determined in step 22 whether or not there is an ON signal of Srisco B. In the above case, since the ON signal of SRISCO B is input, PG4 starts addition through the Y side of the same step. Thus, when the cutting signal of the cutter is introduced in the process of integrating ΔPG ₃ and ΔPG ₄ , step 24
As shown by to 25, △ PG ₄ is counter - to read, Upon completion of loading, △ PG ₄ is reset (step 26). Then, in step 27, L ₂ ≧ l ₁ ×
Although n is discriminated, in the case of the order change illustrated in FIG. 11B, L ₂ ≧ l ₁ × n. Therefore, the process proceeds to the next step 28 to 29 through the Y side of the same step. Then, the value obtained by dividing “L ₂ −ΔPG ₄ − (l ₁ × n)” by the cutting length l ₂ of the new lot is calculated, and the quotient e and the remainder f are automatically obtained. Therefore, in this case, (n + e + 1)
It is found that the second sheet is the cut dimension control target, and the cut length is set to (f + β). By the way, the β
Is a margin size of the slitter scorer, and is set to about 50 to 100 mm in the same manner as described above.

Now, as shown in FIG. 11, the above is the o mark marked *.
The sheet length of the new lot after the dare change point is different from that of the old lot, but the length of the new lot is the same as the length of the old lot, and only the width dimension of the ruled line may be different. . If so, in step 27 L ₂ <l
Since it is determined to be ₁ × n, the process proceeds to steps 30 to 31 via the N side of the same step, and the value of “L ₂ −ΔPG ₄ ” is divided by the length l ₁ of the old lot to calculate the value. The quotient g and the remainder h are calculated. Therefore, in this case, it is found that the sheet to be cut size control target is the (g + 1) th sheet, and the control size is (h + β).

Next, step 32 and subsequent steps in FIG. 9 will be described as follows. For example, in the old lot it was necessary to add ruled lines or cutting lines, but in the new lot it is necessary to obtain a "flat sheet" that does not require them. In such a case, use it in the old lot. The off signal is issued from the previously existing Surisco A, but the B Surisco also becomes inactive. In this case, the steps in FIG.
In S22, the signal of Surisco B is not emitted, so the determination is on the N side and the process reaches Step 32, where the integrated value of ΔPG ₃ at which the addition is started _{first is} “L ₁ −” shown in FIG.
It is determined whether it is equal to or larger than the value of "L ₂ ". Wherein when the integrated value is smaller than "L ₁ -L _2" in temporary, or the integration value is equal to "L ₁ -L _2", or after having to wait until exceeding the value Direct the signal to step 33. This is because, if the integrated value is smaller than L ₁ -L ₂ , it is not clear whether the signal of Srisco B is input or not, and it is meaningless to issue the cutting signal.

When the Y side is discriminated in step 32, the integrated value of ΔPG ₃ is read into the counter in exactly the same manner as described above, the ΔPG ₃ is reset, and then step 36 is executed. Ibid 37-38 or ibid 39
The target cutting dimension control target is (n + i +)
1) It is calculated that the cutting length is (m + β) or (j + β) on the 1st sheet or the (k + 1) th sheet, and the cutter 26 automatically operates according to the calculated value. All that is necessary is to achieve the object of the present invention.

Next, without directly operating the cutter via the signals processed as described above, each signal described above is processed according to the flowchart shown in FIG. Since this can be operated, this case will be described below. It should be noted that the symbols (e) to (e) shown in the upper part of FIG. 10 correspond to the symbols shown in the lower part of FIGS. 8 to 9 described above, and that the signals shown by these respective symbols are introduced into the same symbol part shown in FIG. Means

As is apparent from the above description, the signals indicated by the symbols HO to N in FIG. 10 are introduced into the step 41 in a sporadic or sequential manner in response to the detection of the defective portion. In the same step, the cutting dimension control target designated by the introduction signal, that is, the (n + a + 1) th sheet or (c +
1) Since a signal for instructing the first sheet or the like is input, the number of sheets until the cutter 26 actually operates is subtracted based on the signal. In other words, until the (n + a + 1) th sheet or the like actually reaches the cutter position, the current cut dimension is l ₁
Or, since it has been cut at a predetermined length such as l ₂ etc., the number of sheets is subtracted in step 20, and the target sheet is counted from the time of cutting at a predetermined dimension such as l ₁ or l ₂ etc. Whether or not the second sheet has been reached is determined in the next step 42. If the second sheet is not reached, the N side of the same step 42 is obtained and the signal is returned, and after reaching the second sheet, the signal is introduced to the next step 43. As described above, in the embodiment of the present invention, the reason for discriminating up to the second sheet is that the number is the minimum standby number that the cutter can follow, and when the cutter following ability is improved. The first sheet can be used for the above.

In step 43, when a plurality of cutting dimension control objects are present and are continuous, the operation of selecting the last defective sheet of the plural sheets is performed. In the following step 44, when the plurality of defective sheets compete with each other, the sheet having the largest cutting dimension is selected. Incidentally, the step indicated by 45 in the figure is the same as the above-mentioned
The signal processing in each step is collectively displayed.

The signal subjected to the above-mentioned processing is further guided to step 46, where the minimum cutting size in the current line speed and the maximum cutting size of the sheet which is the cutting size control target are set. When the size of the latter is equal to the size of the former or smaller than the size of the former, the sheet is cut at the maximum cutting size on the maximum sheet through the Y side of step 46. Thus, the defective sheet is cut by sending a signal to the cutter (see step 47).

On the other hand, if the maximum cutting size of the sheet whose cutting size is to be controlled falls within the minimum cutting size of the current line speed, step 48 is reached and the minimum cutting size of the current line speed is reached. The size cuts the defective sheet.

Incidentally, when the defective sheet is thrown out, a defective sheet removing device 30 driven by an air cylinder 29 is installed behind the cutter 26 as shown in FIG. Thus, it is preferable to operate so that the defective sheet thus cut off is projected out of the line. Even in this case, it is possible to know in advance when the disconnection signal of the defective sheet is issued as described above. Therefore, if the air cylinder 29 is operated via the signal, the defective sheet can be automatically eliminated.

[0049]

As described in detail above, according to the present invention, it is possible to suppress the occurrence of unavoidable loss to the minimum extent as compared with the above-mentioned conventional method, and to greatly improve the product yield. At the same time, it is possible to handle refill paper replacement, slitter scorer order replacement, and lot replacement in a unified manner, so it is possible to keep the loss rate lower than the conventional type. In addition, it is highly useful as a method for removing this kind of defective sheet in that the structure itself of the mechanical device can be simplified.

[Brief description of drawings]

FIG. 1 is a plan view showing a situation in which a defective sheet is generated when a lot is changed in the case of manufacturing a corrugated ball sheet in a corrugator.

FIG. 2 is a plan view showing a case where a defective sheet is removed by this method.

FIG. 3 is a plan view for explaining replacement of replacement paper.

FIG. 4 is a plan view for explaining the order change of the slitter scorer.

FIG. 5 is a block diagram showing the configuration of an apparatus used when carrying out the present method.

FIG. 6 is a flow chart of a sheet for explaining an operating state when one silver paper is used in carrying out the present method.
I to C show the change with time.

FIG. 7 is a flow chart of a sheet for explaining an operating state in the case where a plurality of silver papers are used, and the changes with time are shown by a to d in the figure.

FIG. 8 is a flowchart showing a signal processing method using a silver paper detection signal.

FIG. 9 is a flowchart showing a signal processing method when an on / off signal of Srisco is used as a detection signal.

FIG. 10 is a flowchart showing a case where a plurality of cutting dimension control target signals based on the silver paper detection signal and the Srisco on / off signal are introduced and then these signals are processed in a unified manner.
Chart.

FIG. 11 is an explanatory diagram showing a change over time in the occurrence status of a defective sheet when two slitter-scoresers arranged in a tandem system are alternately operated.

FIG. 12 is a graph showing an example of a cutting ability curve specific to a cutter.

[Explanation of symbols]

 11: Multi-stage ball sheet 12: Paper splicing point 13: Lot changing point 14: Sheet including splicing point 21: Double facer 22: Paper splicing mark 23: Pre-stage slitter scorer 24 : Rear stage slitter-Scorer-25: Pulse generator-26: Cutter-27: Cutting signal sensor-28: Arithmetic device 29: Bounce device for defective sheet 30: Number control device

Claims (2)

(57) [Claims] 1. A pulse generator (abbreviated as PG) which comprises a cutter and two tandem type slitter scorers (abbreviated as "Surisco"), and which detects the flow of the raw material of the corrugated cardboard sheet by rotation between the cutter and the Surisco. In a corrugator equipped with a sensor that detects the paper splicing point in front of the Surisco, the cutter is based on the count value of the detection signal from the PG that starts counting when the sensor detects the paper splicing failure point. Calculate the distance that has flown up to the cutting signal as ΔPG, and on the other hand, let L be the distance between the sensor that detects the defective portion of the paper splice and the cutter, and let the cutter cutting dimension be 1 (lowercase L) (L- △ PG) / 1 = c (quotient) + d (remainder), whereby the c value (positive integer) + 1st sheet is regarded as a defective sheet. In addition, the length of the defective sheet is set to a length obtained by adding a margin length α to the distance of d × 1 from the tip of the sheet to be cut, and a method for controlling a cutting device in a corrugator. . 2. A pulse generator (abbreviated as PG) having a cutter and two tandem slitter scorers (abbreviated as Surisco), and detecting the flow of a corrugated board sheet passing through the cutter and the Surisco by rotation.
And, in the corrugator that has a sensor that detects a defective paper splicing point in front of Surisco, a cutter cutting signal that is issued when the cutter cuts the corrugated board sheet and a Surisco ON signal that is issued when Surisco starts processing the corrugated board sheet. Alternatively, using either or both signals of Surisco's off signal issued when Surisco finishes processing the corrugated board sheet, start counting from the time when Surisco issues one of the above signals, and the cutting signal of the cutter is issued. Calculate the distance of the sheet that has flowed until it is calculated as ΔPG. On the other hand, let L be the distance between the sensor that detects the defective portion of the paper splice and the cutter, and set the cutter cutting dimension to 1 (lowercase L) ΔPG) / 1 = c (quotient) + d (remainder) is calculated, whereby the c value (positive integer) + 1st sheet Is a defective sheet, and the length of the defective sheet is a length obtained by adding a margin length α to the distance of d × 1 from the tip of the sheet to be cut. Device control method.