JPH03117598A - Sheet weighing and accumulating device - Google Patents

Abstract

PURPOSE:To make the total weight of accumulated sheets automatically remain within a fixed range at the time of accumulating the cut sheets by altering the length of the sheets to be cut next by a cutting device on the basis of the weight of the each sheet weighed by a weighing means. CONSTITUTION:A cutting device 12 cuts a long sheet continuous in a longitudinal direction to pieces of sheet with a required length as they are measured by a measuring means. The cut sheets are weighed one by one by a weighing means 14. The sheets weighed by the weighing means 14 are stacked in thickness direction by an accumulating means. A control means 18 calculates the length of the sheet to be cut next by a cutting device 12 on the basis of the weight of each sheet weighed by the weighing means 14 so that the total weight of the sheets laminated by the accumulating means 14 may remain within a fixed range, and sends a signal to the cutting device 12 so as to cut the sheet on the basis of the above calculated value.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention is directed to cutting sheets fed almost continuously in a longitudinal direction into desired lengths and stacking these sheets.
The present invention relates to a sheet weighing and stacking device for stacking sheets so that their total weight falls within a predetermined range.

Technical Background of the Invention For example, when extrusion molding a synthetic rubber sheet, the extruded sheet is cut to a desired length, and the sheets are laminated in the thickness direction. There are cases where it is desired to package the accumulated sheets so that their total weight falls within a predetermined range.

In such cases, conventionally, an operator weighs and accumulates the weight of each sheet that is successively cut by a cutting device, so that the total weight of the sheets falls within a predetermined range. However, the work of weighing and accumulating each sheet that is successively cut by a cutting device is a very complicated work, and there is a demand for labor-saving work.

Therefore, it is conceivable to automate such sheet weighing and accumulation work, but it has been extremely difficult to automate such work for the following reasons.

First, it is extremely difficult to keep the thickness and width of the uncut sheet continuously fed out in the longitudinal direction by an extruder etc. One point is that it is extremely rare for the weight to be the same even if cut at a different angle. Therefore, the total weight of the sheets to be stacked cannot be kept within a predetermined range by simply adjusting the cut length of the sheets.

Second, since sheets are continuously fed out from a sheet forming device such as an extruder, the sheets must be cut one after another without stopping the sheet forming device. This is because stopping the sheet forming apparatus reduces work efficiency. However, the need to cut sheets one after another with a cutting device means that the length of the next sheet to be cut is determined based on the measurement results of the cut sheets, and the sheet is cut based on that determined value. making it difficult.

For these reasons, it has been difficult to automate the sheet weighing and accumulation work.

Purpose of the Invention The present invention has been made in view of the above-mentioned circumstances, and is designed to cut sheets that are fed out almost continuously and whose thickness etc. are not always constant one after another, and when stacking these sheets, it is possible to An object of the present invention is to provide a sheet weighing and accumulating device that can automatically adjust the total weight of sheets to a value within a predetermined range.

Summary of the Invention In order to achieve the above object, a sheet measuring and accumulating device according to the present invention includes a cutting means for cutting continuous sheets in the longitudinal direction into a desired length while measuring the sheets using a measuring means;
A measuring means for measuring the weight of each sheet cut by the cutting means, a stacking means for stacking the sheets weighed by the measuring means in the thickness direction, and a total of the sheets stacked on the stacking means. So that the weight is within the specified range,
A control means that calculates the length of the next sheet to be cut by the cutting device based on the weight of each sheet measured by the measuring device, and sends a signal to the cutting device to cut the sheet based on this calculated value. It is characterized by having the following.

The control means includes a sheet number determining circuit that determines the number of sheets to be stacked on the stacking means based on the total weight of the initial number of sheets to be stacked, and a sheet number determination circuit that determines the number of sheets to be stacked on the stacking means based on the total weight of the initial number of sheets to be stacked, and An initial sheet length setting circuit that sends a signal to the cutting device to cut according to the length, and a number of sheets determined by the sheet number determining circuit are stacked when the sheets are stacked on the stacking means. The weight of the last few sheets to be weighed is predicted based on the total weight of multiple sheets weighed before the sheet currently being weighed by the weighing means, and based on the predicted value, the weight of the sheet currently being weighed by the weighing means is calculated. a final sheet length determination circuit that determines the length of the next sheet to be stacked; and the last sheet of the number of sheets determined by the sheet number determination circuit is weighed by the measuring means. Before cutting the last sheet to be stacked using a cutting device,
Next, it sends a signal to the cutting device to cut the initial few sheets that should be stacked from the beginning, and starts stacking based on the total weight of the previous few sheets that are currently being weighed by the weighing means. and a final sheet length determination circuit for determining the final sheet length to be determined.

According to such a sheet weighing and accumulating device according to the present invention,
Since the length of the next sheet to be cut by the cutting device is changed based on the weight of each sheet weighed by the weighing means, when the cut sheets are stacked, the total number of sheets to be stacked is It becomes possible to automatically keep the weight within a predetermined range.

Further, according to the present invention, the control means includes an initial sheet length setting circuit, a sheet number determining circuit, a final sheet length determining circuit, and a final sheet length determining circuit. The total weight of the accumulated cut sheets can be easily adjusted to a value within a predetermined range while cutting the sheets without stopping the feeding of the sheets. Further, cut sheets are less likely to be wasted.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a schematic diagram of a sheet weighing and accumulating device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a control means according to the present invention.
3A to 3C are flowcharts of the control means, and FIG. 4 is a timing chart of a sheet weighing and accumulating apparatus according to an embodiment of the present invention.

As shown in FIG. 1, a sheet weighing and accumulating device 10 according to an embodiment of the present invention includes a cutting means 12, a measuring means 14,
It consists of an accumulation means 16 and a control means 18.

The cutting means 12 includes an encoder 20 as a measuring means for measuring the length of the uncut sheet 19 that is continuous in the longitudinal direction.
and a cutter portion 22 for cutting the sheet 19 to the desired length measured by the encoder 20. The uncut sheet 19 is sent out in the direction of arrow A by a roller 24, for example.

The weighing means 14 is a weighing device 28 that weighs the weight of each cut sheet 19b placed on the conveyor 26. The sheet 19b weighed by the weighing means 14 is
The stacking means 1 is sent by the conveyor 26 in the direction of arrow A.
Head to 6.

In this embodiment, the accumulation means 16 has two first and second accumulation tables 30, 31. 1st. Second accumulation table 30.3
In order to selectively stack and accumulate sheets 19b on sheet 1, this accumulation means 16 has a belt-like conveyor 34 having openings 32 formed at predetermined positions. The conveyor 34 has an opening 32 at a predetermined position. Second accumulation table 30
．． Any device may be used as long as it is attached so as to move in the direction of arrow B around 31. For example, it may be a device in which a large number of rollers are connected in the form of a belt. The opening 32 is
The sheet 19b that has been conveyed at a portion of the conveyor 34 other than the opening 32 is hooked on the movable stoppers 36a and 3.6b, and is slid on the conveyor 34, and is slid on the first. This is for selectively dropping it into either of the second stacking tables 30, 31 through the opening 32. Movable stopper 36
a.

36b is controlled by the control means 18, and when stacking the sheets 19b on the first stacking table 30, the movable stopper 36a is rotated to the solid line position in the figure. Further, when stacking the sheets 19b on the second stacking table 31, one movable stopper 36a is rotated to the dotted line position in the figure, and the other movable stopper 36b is rotated to the solid line position in the figure. There is. Furthermore, when not stacking on any of the stacking tables 30, 31, both movable stoppers 36a, 36b are rotated to the dotted line position in the figure.

In this embodiment, the control means 18, as shown in FIG.
Initial sheet length setting circuit 40 and sheet number determining circuit 4
2, a final sheet length determining circuit 44, and a final sheet length determining circuit 46.

The sheet number determining circuit 42 is a circuit that calculates the number of sheets to be stacked on the stacking means 16 based on the input signal from the measuring means 14.

The initial sheet length setting circuit 40 is a circuit that sends an output signal to the cutting means to cut the initial number of sheets to be stacked downward to a predetermined length.

The final sheet length determining circuit 44 predicts the weight of the last few sheets to be stacked upward based on the information from the weighing means, and calculates the weight of the last few sheets to be stacked next to the sheet currently being weighed by the weighing means. This circuit determines the length of the second sheet and sends the determination signal to the cutting means 12.

The control details of the sheet weighing and accumulating device 10 controlled by such a control means 18 will be explained based on FIG. 3.

As shown in FIG. 3(A), when the control starts, in step 50, the X register indicating the number of sheets to be weighed next is set to 1, and the X register indicating the number of sheets to be stacked is set to 1. Enter the predetermined value m. The predetermined value m can be changed as appropriate, but when seven or eight sheets are stacked and stacked, m=7.

Next, in step 51,! Predetermined value in register! Add L engineer. The 1st register is a register indicating the cutting length of the Xth sheet. For example, in the case of stacking seven sheets, the predetermined value L is set so that L1 to L4 are the standard size, and L-L7 is set to be smaller than the standard size. In addition, in the case of stacking 8 sheets, L-L5 is set to be the standard size, and L6 to L8 are set to be smaller than the standard size.

Such settings are made by an initial sheet length setting circuit 40 shown in FIG.

Next, in step 52, a signal is sent to the cutting means 12 (see FIGS. 1 and 2) to cut the Xth sheet to a length lK. When x=1, the first sheet is cut to length l = L 1 (standard size).

Next, in step 53, the weight of the cut X-th sheet is measured by the measuring means 14, and the value is entered into the register n. Parallel to step 53! After step 52, step 54 is performed.

In step 54, it is determined that X≧X−2.

That is, it is determined whether the number of currently cut sheets is (X-2) or more, and if so, the process goes to step 55, and if not, the process goes to step 56. Note that (X-2) indicates the number of sheets stacked third from the end.

If the last sheet is the 53rd or earlier sheet, the process goes to step 56, where it is determined whether the number of sheets is a predetermined value.

For the predetermined value, if the first sheet is sent from the beginning, calculate the total weight of the sheets weighed before that,
This is a number used to determine how many sheets to stack in total. When seven or eight sheets are stacked, for example, =3 is used. If x=not, go to step 57; if x=, go to step 58.

In step 57, it is determined whether x>k, and if so, the process goes to step 59; otherwise, the process goes to step 60.

In other words, if there are fewer than the current sheet,
Go to step 60 and register X is updated. For example, if x=1, then x=2 in step 60.
becomes. Step 61 is executed after step 60, and it is determined whether X≧(X-2). If it is less than or equal to
The sheets of . . .
...) will be disconnected. This control is performed by an initial sheet length setting circuit 40 shown in FIG.

When the kth sheet (for example = 3) is weighed, step 56 moves to step 58, where the expected weight is calculated based on the total weight of the sheets weighed before the kth sheet (including the kth sheet). The final stacked total weight f(n,) is calculated,
It is determined whether the value is greater than or equal to a predetermined weight (Ng+α). In other words, if k sheets are cut and the expected final laminated total weight f(n,) based on the total weight is less than the predetermined weight N, then In this case, it is predicted that the final total weight of the stacked sheets will be insufficient, and in that case, the process goes to step 62. In step 62, the value m of the register X indicating the number of sheets to be finally stacked is updated to m+1. In this case, (m+1) sheets are stacked. When m is 7, 8 sheets are laminated. Also, f (n, )
If is smaller than N, as originally planned, X=m sheets are laminated and the process goes directly to step 63. Such control is performed by a sheet number determining circuit 42 shown in FIG.

Incidentally, when the expected final total stacked weight f(n,) is, for example, =3 and m=7, it is determined as follows.

f (n,)= (n +n2+n3)X2+n
31 Also, among the predetermined weight Ng+α, Ng is the ideal set weight of the sheets to be finally stacked and accumulated, and α is the allowance weight. α is 0 to 0 of Ng. Preferably it is 5%.

In parallel with steps 58 and 62, and without waiting for the calculation result, step 56 is followed by step 63,
Register X is updated to become X+1. Since the current register X is k, the register X becomes +1, and the process goes to steps 51 and 52 to cut the next (k+1)th sheet.

When x>k, step 57 causes step 59.6
Go to 4.65. Steps 59, 64 and 65 correspond to the final sheet length determining circuit 44 shown in FIG.

In step 59, the weight of the x+1th sheet, that is, the next sheet to be cut, is predicted, and that value is stored in register n. The prediction for n is as follows:
Make it 1+1.

nx+, = (n +n2+-・-+n,)÷(L
+L2+...+L engineering) XL□I That is, the value of n is predicted based on the total weight of the sheets up to the Xth sheet.

X+1 In step 64, the weight of the x+2nd sheet to be cut is predicted and the value is entered into register nX+2. n
The prediction is made as follows.

X+2 n,, 2 = (Ng-(n, +n2+−−−−−−+
n, +1)) ÷ (X-x-1) That is, the weight of the x+2nd sheet is determined based on the measured total weight up to the Xth sheet and the expected weight of the X1,000th sheet.

In step 65, the length of the 1st+2th sheet of X+2 sheets is predicted using n, and the value is 18,2! +
Put it in 2. Calculation of L is performed as follows.

X+2 Parallel to steps 59, 64, and 65, and without waiting for their completion, step 57 is followed by step 60, in which register X is updated to become X+1.

The number of sheets to be cut next is the third from the end (X-2
), the process goes from step 61 to step 52 without going to step 51. Therefore, the (X-2)th sheet is cut to a length based on the predicted value set in step 65. Then go through steps 53, 54, go through steps 55, 60, 61 and go to step 52,
The (X-1)th sheet is also cut to the predicted length in step 65.

When the previous sheet (X-1) is cut, the process proceeds from step 66 to step 67. In step 67,
Total of actual measurements of sheets weighed up to that point n + n
+・・・・・・+n, 1 2
x-1 First, calculate the last (X) sheet weight. The calculation formula is shown below.

n=Ng-(n+...+n)xI
t-1 Based on this weight n, the cutting length of the last sheet! Predict L. The calculation formula is shown below.

In parallel with steps 53 and 67, upon completion of step 52, the process proceeds to steps 68 and 69 shown in FIG. 3(B). In step 69, before the calculation result of the final sheet length predicted in step 67 is obtained, the p-th sheet to be stacked and accumulated next is cut to length. The length is a preset length corresponding to L in step 51.

! Step 69 is followed by step 70.

Step 70 corresponds to step 53. Step 7
0, in step 71 it is determined whether or not the final sheet in the previous stage has been cut. If it has not been cut yet, in step 72 X is updated to x+1, and in step 52 the final sheet is cut. cut. At this time, the calculation in step 67 has also been completed, so the cut length of the final sheet is the predicted value calculated in step 67.

In this way, cutting the p-th sheet that will be newly accumulated in the next stage before cutting the final sheet is not recommended because it takes time to weigh the sheets, etc. This is because if the final sheet is not cut until the sheet is weighed, it is necessary to stop feeding the sheet during that time, resulting in wasted work.

Note that steps 67, 68, and 69 are performed by the final sheet length determining circuit 46 shown in FIG.

Once the final (X) sheet is cut, step 66 goes to step 72, where the final (X) sheet is weighed;
Total of actual measurements (n 1+ n 2+...n)
Find this and set it as Nr.

! N r = (x 1 + x 2 + ・” ”・+
x x) Next, in step 73, it is determined whether the final total weight Nr of the sheets to be stacked is within a predetermined range. Specifically, next, a determination is made using a calculation formula.

lNr-Ngl≦R Here, Nr is the measured total weight of the sheet, Ng is the ideal total weight of the sheet, and R is the allowable error. The present invention can function effectively even when the tolerance R is particularly small. In the present invention, the tolerance R can also be set to 0.2% or less with respect to Nr.

If Nr is within a predetermined range, the first stage of accumulation will be completed by stacking and accumulating the current final sheets as they are.
Next, go to step 74. In step 74, registers p and n used in step 69.70 are set to x
, n, and the next stage of sheet cutting, weighing, and stacking is performed from step 51.

In step 73, if Nr is outside the predetermined range, it is necessary to recut the final sheet, in which case the process goes to step 75. In step 75, register p
The value of is updated to p+1.

Note that in parallel with steps 72 and 73, the process proceeds from step 66 to step 75 without waiting for the calculation result of step 72. This is because waiting for the end of step 72 would require stopping sheet feeding.

Next, in step 76, it is determined whether p is within 3 times, and if it is within 3 times, in step 69, the p-th sheet in the next stage is cut to length L.

Thereafter, through step 71, the final sheet is cut again in step 52, and in step 72.73 it is determined whether the total accumulated weight falls within a predetermined range. This kind of final sheet recutting is done in step 7.
6, it is repeated until p reaches 3 times. If this is exceeded, registers p and n are changed to register X in step 77 without reshuffling the final sheet.

After converting to n8, the process returns to step 51, and the next stage of sheet accumulation is performed.

If the final sheet is recut for the third time (p = 3), the final sheet is stacked without being rejected and its total weight is weighed on each stacking table 30, 31, and even if it is outside the specified range. If so, it is discharged from each stacking platform 30,31.

In step 73, if it is determined that the total weight Nr is within a predetermined range, the final sheet is transferred to the conveyor 34 shown in FIG.
carried onto the first or second accumulation platform 30.31 by
A stack of sheets is obtained with a total weight within a predetermined range.

This sheet stack is arranged on the first or second stacking table 30.31.
The products are then automatically transported to another location and packaged there.

Note that the p-th sheet in the next stage described above is the first
In the figure, when sheets from the previous stage are stacked on the first stacking table 30, the movable stopper 36a is arranged so that the sheets are stacked on the second stacking table 31.

36b is controlled, and vice versa, the movable stopper 36a is controlled so that it is stacked on the first stacking table 30.

Next, the present invention will be explained based on the time chart shown in FIG.

The time chart shown in FIG. 4 is an example of stacking eight sheets. Figure 5 shows the state in which 8 sheets are stacked (
Shown in A). FIG. 5(B) is an example in which seven sheets are stacked.

When stacking 8 sheets, the initial 5 stacked sheets (5 sheets from the bottom) are set by the initial sheet length setting circuit 40 shown in FIG.
The sheets are cut to a fixed length by the final sheet length setting circuit 44 and the final sheet length setting circuit 46, and the final three sheets are cut to a length predicted by the final sheet length setting circuit 44 and the final sheet length setting circuit 46 and stacked. In addition, in the case of stacking 7 sheets, the initial 4 sheets of the stack are cut to a predetermined length by the initial sheet length setting circuit 40, and the final 3 sheets of the stack are cut by the final sheet length setting circuit 44 and the final sheet length setting circuit. The fibers are cut to the predicted length by 46 and stacked.

In either case, the length of the three sheets at the final stage of accumulation is set to be shorter than the initial length in consideration of stabilizing the stacked state and facilitating packaging in the subsequent process.

Returning to the time chart shown in FIG. 4, the case of stacking 8 sheets will be explained.

The horizontal axis in FIG. 4 is the elapsed time T. ■ to ■ indicate the feeding time of the uncut sheet corresponding to the number, and the first and second sheets are cut in order from the left. The timing of cutting is indicated by 80. The cut sheet is the first
As shown in the figure, although it moves in the direction of the measuring means 14, the time required for it to completely move onto the measuring means 14 is tl.

Moreover, the measurement time is t2.

As shown in FIG. 4, in order to continuously feed out the sheets to be cut, the next sheet may be cut before the previous sheet is completely weighed.

For this purpose, in order to cut the sheet at the predicted value, the sheet length prediction is performed in step 65 shown in FIG. need to be predicted.

Also, for the same reason, in order to cut the final sheet (in this case, the 8th sheet) at the predicted value, before cutting the 8th sheet,
Next, it is necessary to cut the first stacked sheet.

If the total weight does not fall within the predetermined range in steps 72 and 73 shown in FIG. will be held again. If the predetermined range is still not reached, the next stage of stacking is performed without recutting the final sheet.

Stacked sheets whose total weight does not fall within a predetermined range are discharged from the first or second stacking table 30.31 by a conveyor.

The accumulated sheets whose total weight falls within the predetermined range are classified into the first. The products are automatically transported from the second stacking table 30, 31 by a conveyor or the like, packaged at another location, and shipped.

Note that the present invention is not limited to the embodiments described above, and can be variously modified within the scope of the present invention.

For example, cutting means 12, measuring means 14 and accumulating means 1
The device 6 is not limited to the illustrated example, but may be any type of device as long as it can achieve the object of the present invention. Further, as the control means 18, an IC may be used, but other electric circuits may also be used.

As described in detail, according to the present invention, the length of the next sheet to be cut by the cutting device is changed based on the weight of each sheet measured by the measuring means. When stacking cut sheets, it is possible to automatically keep the total weight of the stacked sheets within a predetermined range.

Further, according to the present invention, the control means includes an initial sheet length setting circuit, a sheet number determining circuit, a final sheet length determining circuit, and a final sheet length determining circuit. The total weight of the accumulated cut sheets can be easily adjusted to a value within a predetermined range while cutting the sheets without stopping the feeding of the sheets except in times of trouble. Further, cut sheets are less likely to be wasted.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a sheet weighing and accumulating device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a control means according to the present invention.
3(A) to 3(C) are flowcharts of the control means, FIG. 4 is a timing chart of a sheet weighing and accumulating device according to an embodiment of the present invention, and FIGS. 5(A) and (B) are FIG. 3 is a side view of stacked sheets. 12... Cutting means 14... Measuring means 16.
...Integration means 18...Control means 0...Initial sheet length setting circuit 2...Sheet number determining circuit 4...Final sheet length determining circuit 6...Final sheet length determining circuit

Claims (1)

[Scope of Claims] 1) A cutting means for cutting a continuous sheet in the longitudinal direction into a desired length while measuring the sheet to a desired length, and measuring the weight of each sheet cut by the cutting means for each sheet. a measuring means for weighing; a stacking means for stacking sheets weighed by the measuring means in the thickness direction; and a stacking means for stacking sheets on the stacking means so that the total weight of the sheets falls within a predetermined range. and control means for calculating the length of the next sheet to be cut by the cutting device based on the weight of each sheet weighed by the controller, and sending a signal to the cutting device to cut the sheet based on this calculated value. Sheet weighing and accumulating device. 2) The control means includes a sheet number determination circuit that determines the number of sheets to be stacked on the stacking means based on the total weight of the initial number of sheets to be stacked, and the initial number of sheets to be stacked is determined in advance. an initial sheet length setting circuit that sends a signal to the cutting device to cut at a predetermined length; and an initial sheet length setting circuit that sends a signal to the cutting device to cut the sheet at a predetermined length; The weight of the last few sheets to be weighed is predicted based on the total weight of multiple sheets weighed before the sheet currently being weighed by the weighing means, and based on the predicted value, the weight of the last few sheets to be weighed by the weighing means is calculated based on the predicted value. a final sheet length determining circuit that determines the length of the next sheet to be stacked after the current sheet; and a final sheet length determining circuit that determines the length of the next sheet to be stacked after the current sheet, and a final sheet length determination circuit that determines the length of the next sheet to be laminated after the current sheet; When the last sheet to be laminated is cut by a cutting device,
Next, it sends a signal to the cutting device to cut the initial few sheets that should be stacked from the beginning, and starts stacking based on the total weight of the previous few sheets that are currently being weighed by the weighing means. 2. The sheet weighing and accumulating apparatus according to claim 1, further comprising a final sheet length determination circuit for determining the final sheet length to be determined.