JPH0811395B2 - Sheet weighing and stacking device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention cuts a sheet fed substantially continuously in the longitudinal direction to a desired length and accumulates these sheets so that the total weight thereof is a predetermined value. The present invention relates to a sheet weighing and accumulating device for accumulating so as to obtain values within a range.

TECHNICAL BACKGROUND OF THE INVENTION For example, when a synthetic rubber sheet is extruded, the extruded sheet is cut into a desired length, and these sheets are stacked in the thickness direction and accumulated. ,
It may be desirable to package the sheets with the total weight of the accumulated sheets falling within a predetermined range.

In such a case, conventionally, an operator accumulates the weights of the sheets that are successively cut by the cutting device while weighing them so that the total weight of the sheets falls within a predetermined range. However, the work of manually weighing and accumulating the weight of each sheet that is successively cut by the cutting device is a very complicated work, and labor saving of the work is required.

Therefore, it is conceivable to attempt to automate the work of measuring and accumulating such sheets, but the automation is extremely difficult for the following reasons.

First, it is extremely difficult to keep the thickness and width of the uncut sheet continuously fed in the longitudinal direction by an extruder or the like. It is extremely rare that the weight will be the same even if cut with. Therefore, the total weight of the sheets to be stacked cannot be kept within a predetermined range by simply adjusting the cutting length of the sheets.

Secondly, since the sheet is continuously fed from the sheet forming apparatus such as an extruder, the sheets have to be cut one after another without stopping the sheet forming apparatus. This is because stopping the sheet forming device reduces work efficiency. However, the fact that the cutting device has to cut the sheets one after another means that the sheet length to be cut next is determined based on the measurement result of the cut sheets, and the sheets are cut based on the determined value. Have difficulty.

For these reasons, it is difficult to automate the work of weighing and accumulating sheets.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when sheets which are not continuously fed and which are not always constant in thickness and which are delivered substantially continuously are successively cut, and when these sheets are stacked, they are stacked. An object of the present invention is to provide a sheet weighing and accumulating device capable of automatically adjusting the total weight of sheets to be processed to a value within a predetermined range.

SUMMARY OF THE INVENTION In order to achieve such an object, a sheet weighing and accumulating apparatus according to the present invention is a cutting unit for cutting a continuous sheet in a longitudinal direction with a measuring unit and cutting it into a desired length, A total of a weighing means for weighing the weight of each of the sheets cut by the cutting means, a stacking means for stacking the sheets weighed by the weighing means in the thickness direction, and a sheet stacked on the stacking means. The cutting device calculates the length of the sheet to be cut next based on the weight of each sheet weighed by the weighing means so that the weight falls within a predetermined range, and the sheet is cut based on this calculated value. And a control means for sending a signal to the cutting device, wherein the control means determines the number of sheets to be stacked on the stacking means based on the total weight of the initial several sheets to be stacked, and a sheet number determination circuit. , Stacked An initial sheet length setting circuit for sending a signal to the cutting device so as to cut an initial number of sheets to be cut at a predetermined length, and the number of sheets determined by the sheet number determination circuit When stacking on the stacking means, the weight of the last several sheets to be stacked is predicted based on the total weight of the plurality of sheets weighed before the sheet currently weighed by the weighing means, and the prediction is made. Based on the value, the final sheet length determining circuit that determines the sheet length to be stacked next to the sheet currently being weighed by the weighing means, and the final sheet number of the sheet numbers determined by the sheet number determining circuit. When the previous sheet is weighed by the weighing means, before cutting the last sheet to be stacked by the cutting device, the initial few sheets to be stacked from the beginning are cut next. Cutting equipment And a final sheet length determining circuit that determines the final sheet length to be stacked based on the total weight of several sheets before the sheet currently being weighed by the weighing means. It has a feature.

According to such a sheet weighing and accumulating apparatus of 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 weighed by the weighing means. When collecting the cut sheets,
It is possible to automatically put the total weight of the stacked sheets within a predetermined range.

Further, according to the present invention, the total weight of the cut sheets to be accumulated can be easily adjusted within a predetermined range while cutting the sheet without stopping the feeding of the sheet before the cutting which is continuously fed out. It can be a value. Also,
Cut sheets are rarely 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 apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram of control means according to the present invention, and FIGS. 3 (A) to (C) are flowcharts of the control means. 4 and 5 are timing charts of the sheet weighing and accumulating means according to the embodiment of the present invention.

As shown in FIG. 1, a sheet weighing and stacking apparatus 10 according to an embodiment of the present invention comprises a cutting means 12, a weighing means 14, a stacking means 16 and a control means 18.

The cutting means 12 is a sheet before cutting which is continuous in the longitudinal direction.
An encoder 20 as a measuring means for measuring the length of 19, and
Sheet to the desired length measured by this encoder 20
And a cutter section 22 for cutting 19. Sheet before cutting 19
Is sent out in the direction of arrow A by the roller 24, for example.

The weighing means 14 is a weighing device 28 that weighs the cut sheets 19b placed on the conveyor 26 one by one. The sheet 19b weighed by the weighing means 14 is transferred to the conveyor 26
Is sent in the direction of the arrow A toward the collecting means 16.

The stacking means 16 is, in this embodiment, two first and second stacking stands.
Has 30,31. Sheet 19b on the first and second stacking stands 30, 31
In order to selectively stack and integrate the
Has a belt-shaped conveyor 34 having an opening 32 formed at a predetermined position. The conveyor 34 may be any as long as it has an opening 32 at a predetermined position and is mounted so as to move around the first and second stacking tables 30 and 31 in the direction of arrow B, for example, a large number of rollers. May be connected in a belt shape. The opening 32 is a movable stopper 36a, 36b for the sheet 19b conveyed at a site other than the opening 32 in the conveyor 34.
On the conveyor 34 and slide it on the first and second stacking stands.
It is for selectively dropping into any one of 30, 31 through the opening 32. The movable stoppers 36a and 36b are
Sheets are placed on the first stacking table 30 under the control of the control means 18.
In the case of stacking 19b, the movable stopper 36a is rotated to the solid line position in the drawing. The second stacking platform
When stacking the sheets 19b on the sheet 31, one movable stopper 36a is rotated to the upper dotted line position in the figure, and the other movable stopper 36b is rotated to the upper solid line position in the figure. Furthermore, when neither of the stacking tables 30 and 31 is to be stacked, both the movable stoppers 36a and 36b are rotated to the dotted line positions in the drawing.

In the present embodiment, the control means 18 is, as shown in FIG.
Initial sheet length setting circuit 40 and sheet number determination circuit 42
And a final sheet length determination circuit 44 and a final sheet length determination circuit 46.

The sheet number determination circuit 42 is a circuit for calculating the number of sheets to be accumulated in the accumulating means 16 based on the input signal from the weighing means 14.

The initial sheet length setting circuit 40 is a circuit that sends an output signal to the cutting means so as to cut the initial several sheets to be stacked below with a predetermined length.

The final sheet length determination circuit 44 predicts the weight of the last several sheets to be stacked above based on the information from the weighing means, and stacks the sheet next to the sheet currently weighed by the weighing means 2 A circuit for determining the second sheet length and sending the determination signal to the cutting means 12.

The control contents of the sheet weighing and stacking apparatus 10 controlled by the control means 18 will be described with reference to FIG.

As shown in FIG. 3 (A), when the control starts,
In step 50, the x register indicating the number of the next sheet to be weighed is set to 1, and a predetermined value m is entered in the X register indicating the number of sheets to be stacked. The predetermined value m can be changed appropriately, but when 7 sheets or 8 sheets are stacked and integrated, m = 7.

Next, at step 51, a predetermined value L _x is put in the l _x register. The l _x register is a register indicating the cutting length of the x-th sheet. The predetermined value L _x is, for example, L ₁ to
L ₄ is set to a standard size, and L _{5 to} L ₇ are set to a size smaller than the standard size. Also, in the case of stacking 8 sheets,
L _{1 to} L ₅ are set to have a standard size, and L _{6 to} L ₈ are set to have a size smaller than the standard size. Such a setting is the second
This is done by the initial sheet length setting circuit 40 shown in the figure.

Next, at step 52, a signal is sent to the cutting means 12 (see FIGS. 1 and 2) so as to cut the _x-th sheet with a length l _x . If x = 1, the length of the first sheet is l ₁ =
Cut at L ₁ (standard size).

Next, at step 53, the weight of the cut x-th sheet is weighed by the weighing means 14, and the value is stored in the register n _x . In parallel with step 53, step 52 is followed by step 54.

In step 54, x ≧ X−2 is determined. That is, it is determined whether or not the currently cut sheet is (X-2) or more, and if so, the process proceeds to step 55, and if not, the process proceeds to step 56. Note that (X-2) indicates the number of sheets stacked in the third from the last.

If the sheets are the third to last sheets, the process goes to step 56 to determine whether the number of sheets is a predetermined value k.
The predetermined value k is the total weight of the previously weighed sheets when the k-th sheet is sent from the beginning,
It is a number for judging how many sheets are stacked as a whole. When 7 or 8 sheets are stacked, for example, k = 3 is used. If not x = k, go to step 57, and if x = k, go to step 58.

In step 57, it is determined that x> k, and if so, the process proceeds to step 59, and if not, to step 60.

That is, when the current sheet is less than the k-th sheet, the process goes to step 60 and the register x is updated. For example, if x = 1, step 60 yields x = 2.
Becomes After step 60, step 61 is executed and x
It is determined whether ≧ (X−2). If x is less than or equal to k, x ≧ (X−2) does not hold. Therefore, the process proceeds to step 51 and steps 51 to 60 are repeated, and the first sheet, the second sheet, ... Sequentially have a predetermined length (L ₁ , L ₂ ……) is cut. The control is performed by the initial sheet length setting circuit 40 shown in FIG.

When the kth sheet (for example, k = 3) is weighed,
From step 56 to step 58, the expected final accumulated total weight f (n _i ) is calculated based on the total weight of the sheets weighed before the k-th sheet (including the k-th sheet), and this value is calculated. It is determined whether or not the weight is equal to or more than a predetermined weight (Ng + α).
That is, when k sheets are cut and the final total weight f (n _i ) expected based on these total weights is equal to or less than the predetermined weight N, it is assumed that X = m sheets are finally laminated. ,
If the final total sheet stack weight is expected to be insufficient, then go 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 be m + 1. In this case,
(M + 1) sheets are stacked and integrated. If m is 7, then
It is a stack of 8 sheets. When f (n _i ) is smaller than N, X = m sheets are stacked and stacked as originally planned, and the process goes directly to step 63. Such control is performed by the sheet number determination circuit 42 shown in FIG.

Note that the expected final total stack weight f (n _i ) is, for example, k
= 3 and m = 7, it is obtained as follows.

f (n _i ) = (n ₁ + n ₂ + n ₃ ) × 2 + n ₃ Among the predetermined weights Ng + α, Ng is the ideal set weight of sheets to be finally stacked and accumulated, and α is a surplus weight. . α is preferably 0 to 0.5% of Ng.

In parallel with steps 58 and 62, without waiting for the calculation result, step 63 is followed by step 63, and step x is updated to x + 1. Since the current register x is k, the register x becomes k + 1, and step 5
Go to 1,52 and cut the next (k + 1) th sheet.

When x> k, step 57, steps 59, 64, 65
Go to 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 sheet to be cut next is predicted, and the value is stored in the register n _{x + 1} . The n _{x + 1} prediction is performed as follows.

n _{x + 1} = (n ₁ + n ₂ ＋ …… ＋ n _x ) ÷ (L ₁ + L ₂ ＋ …… ＋ L ₁ ) × L _{x + 1} That is, n based on the total weight of the sheets up to the x-th sheet
_It predicts the value of _{x + 1} .

In step 64, the weight of the x + 2th sheet to be cut is predicted, and the value is _stored in the register n _{+ 2} . The prediction of n _{x + 2} is performed as follows.

_{n x + 2 = {Ng- (} n 1 + n 2 + ...... + n x + 1)} ÷ (X-x-1) That is, based on the predicted weight of the actual total weight and x + 1 th to x th, Determine the weight of the x + 2nd sheet.

In step 65, _{nx + 2} is used to predict the sheet length _{Lx + 2} of the _{x + 2nd} sheet, and the value is put in _{lx + 2} . The calculation of L _{x + 2} is performed as follows.

In parallel with steps 59, 64 and 65, without waiting for the end,
After step 57, step 60 is performed and the register x is updated to x + 1.

The number of sheets to be cut next is the third from the last (X-
When it becomes 2), instead of going from step 61 to step 51, it goes to step 52. Therefore, the (X-2) th sheet is cut with a length based on the predicted value set in step 65. Then go through steps 53 and 54 to steps 55 and 6.
Going to step 52 through 0,61, the (X-1) th sheet is also cut in the length predicted in step 65.

When the last (X-1) th previous sheet is cut, the process proceeds from step 66 to step 67. In step 67, the total of the measured values of the sheets weighed up to that point is n ₁ + n ₂ + ... + n
_The final (X) sheet weight is first calculated using _x-1 . The calculation formula is shown below.

_{n x = Ng- (n 1 +} ...... + n x-1) based on the weight n _x, to predict the cut length L _x of the last sheet. The calculation formula is shown below.

When step 52 is completed in parallel with steps 53 and 67, the process goes to steps 68 and 69 shown in FIG. 3 (B). In step 69, the p-th sheet to be stacked next is cut to a length L _p before the calculation result of the final sheet length predicted in step 67 is obtained. The length L _p is a preset length corresponding to L _x in step 51. After step 69, step 70 is performed. Step 70, Step 53
Corresponding to. After step 70, in step 71, it is determined whether or not the last sheet of the previous stage has been cut. If it is not cut yet, x is updated to x + 1 in step 72, and final in step 52. Cut the sheet.
At that time, since the calculation in step 67 is also completed, the cut length of the final sheet is the predicted value calculated in step 67.

As described above, cutting the p-th sheet that is newly accumulated in the next stage before cutting the final sheet is the first from the end because it takes time to measure the sheet. 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 period, which is a waste of work.

The steps 67, 68 and 69 are executed by the final sheet length determining circuit 46 shown in FIG.

When the final (X) sheet is cut, the process proceeds from step 66 to step 72, the weight of the final (X) sheet is weighed, and the total value (n ₁ + n ₂ + ... n _x ) of the measured values is obtained. Nr.

Nr = (x ₁ + x ₂ + ... + x _x ) Next, in step 73, it is determined whether or not the final total weight Nr of the sheets to be laminated is within a predetermined range. Specifically, a determination is next made using a calculation formula.

| Nr−Ng | ≦ R where Nr is the actual sheet total weight, Ng is the ideal total sheet weight, and R is the tolerance. The present invention can effectively function even when the tolerance R is particularly small. In the present invention, the allowable error R is 0.2 with respect to Nr.
It can be less than or equal to%.

If Nr is within the predetermined range, the first stage of stacking will be completed if the current final sheet is stacked and stacked as it is.
Then go to step 74. In Step 74, Steps 69, 7
The registers p and n _p used in 0 are converted into x and n _x , respectively, and from step 51, the next step of sheet cutting, weighing, and stacking is performed.

If Nr is out of the predetermined range in step 73, the final sheet needs to be cut again, and in that case, the process proceeds to step 75. In step 75, the value of the register p is updated to p + 1.

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. The reason for waiting for the end of step 72 is that the sheet feeding must be stopped.

Next, at step 76, it is judged whether or not p is within 3 times, and if it is within 3 times, at step 69, the p-th sheet in the next stage is cut with the length L _p .

Then, through step 71, in step 52,
The final sheet is cut again, and in steps 72 and 73, it is confirmed whether the accumulated total weight is within a predetermined range.
Such recutting of the final sheet is repeated in step 76 until p becomes 3 times. If the number of sheets exceeds the limit, in step 77, the steps p and n _p are converted into registers x and n _x without returning to the final sheet, and the process returns to step 51 to perform the next sheet accumulation.

When the recutting of the final sheet is the third time (p = 3)
The final sheets are laminated without being rejected,
The total weight is weighed on each stacking table 30, 31, and if it is still outside the predetermined range, it is discharged from each stacking table 30, 31.

If the total weight Nr is determined to be within the predetermined range in step 73, the final sheet is carried by the conveyor 34 shown in FIG. 1 onto the first or second stacking table 30, 31, and the total weight within the predetermined range is reached. A sheet aggregate having the following structure is obtained. This sheet stack is automatically conveyed from the first or second stacking table 30, 31 to another place and is packaged there.

It should be noted that the p-th sheet in the next stage described above is stacked on the second stacking table 31 in FIG. 1 when the sheets in the previous stage are stacked on the first stacking table 30. , The movable stoppers 36a and 36b are controlled, and in the opposite case, the movable stoppers 36a and 36b are stacked on the first stacking table 30.
a is controlled.

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

The time chart shown in FIG. 4 is an example of stacking eight sheets. A state in which eight sheets are stacked is shown in FIG. FIG. 5B is an example in which seven sheets are stacked.

In the case of stacking 8 sheets, the initial stack length setting circuit 40 shown in FIG.
Then, the final three sheets of the stacking are cut to a predetermined length by the final sheet length setting circuit 44 and the final sheet length setting circuit 46 and stacked. Further, in the case of stacking 7 sheets, up to the initial 4 sheets of the stacking are cut into a predetermined length by the initial sheet length setting circuit 40, and the final 3 sheets of the stacking are cut into the final sheet length setting circuit 44 and the final sheet length setting circuit. Cut and collect at length predicted by 46. In any case, the reason why the length of the three sheets at the end of the stacking is set to be shorter than the initial length is because the stable stacking state and the ease of packaging in the subsequent process are taken into consideration.

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

The horizontal axis in FIG. 4 is the elapsed time T. The symbols (1) to (5) indicate the feeding time of the uncut sheet corresponding to the numeral, and the first and second sheets are cut in order from the left. The disconnection timing is indicated by reference numeral 80. Cut sheet is first
As shown in the figure, the time for moving to the measuring means 14 direction, but the time until it completely moves onto the measuring means 14 is t ₁ . Also,
The weighing time is t ₂ .

As shown in FIG. 4, in order to continuously feed the uncut sheet, the next sheet may be cut before the weighing of the preceding sheet is completely finished. For this reason, in order to cut the sheet at the predicted value, the sheet length is predicted by the third
It is necessary to predict the sheet length to be cut next to the sheet currently being weighed, as is done in step 65 shown. For the same reason, in order to cut the final sheet (in this case, the eighth sheet) at the predicted value, it is necessary to cut the first sheet to be stacked next before cutting the eighth sheet. is there. When the total weight does not reach the predetermined range at steps 72 and 73 shown in FIG. 3, the final cutting of the eighth sheet is during the next step of cutting the sheet, or
Will be done again in between. If it still does not reach the predetermined range, the next stage of stacking is performed without recutting the final sheet.

The accumulated sheet that does not reach the total weight within the specified range is
Alternatively, it is discharged from the second stacking table 30, 31 by a conveyor.

The accumulated sheets having the total weight within the predetermined range are automatically conveyed from above the first and second accumulation tables 30 and 31 by a conveyor or the like, packaged at another place, and shipped.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention.

For example, the cutting means 12, the weighing means 14, and the accumulating means 16 are not limited to the illustrated examples, but may be any type of device as long as each means can achieve the object of the present invention. The control means 18 may be an IC, but may be another electric circuit.

As described above, 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 weighed by the weighing means. When stacking the cut sheets, it is possible to automatically fit the total weight of the stacked sheets within a predetermined range.

Further, according to the present invention, the total weight of the cut sheets to be accumulated can be easily set within a predetermined range while cutting the sheets without stopping the feeding of the pre-cut sheets that are continuously fed out except when trouble occurs. Can be a value within.
Further, the cut sheet is rarely wasted.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a sheet weighing and accumulating apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram of control means according to the present invention,
3 (A) to 3 (C) are flow charts of the control means, FIG. 4 is a timing chart of the sheet weighing and accumulating apparatus according to one embodiment of the present invention, and FIGS. 5 (A) and 5 (B) are It is a side view of the accumulated sheet. 12 …… Cutting means, 14 …… Weighing means 16 …… Integrating means, 19 …… Control means 40 …… Initial sheet length setting circuit 42 …… Sheet number determination circuit 44 …… Last sheet length determination circuit 46 …… Final sheet length determination circuit

Front Page Continuation (72) Inventor Hiroyasu Sakaguchi 2009-72 Shimonagayacho, Konan-ku, Yokohama-shi, Kanagawa 2009-72 (56) References: 3-11593 (JP, U)

Claims (1)

[Claims] 1. A measuring means for measuring a continuous sheet in a longitudinal direction by a measuring means, and a cutting means for cutting the sheet into a desired length, and a weighing for measuring the weight of each of the sheets cut by the cutting means one by one. Means, a stacking means for stacking the sheets weighed by the weighing means in the thickness direction, and the weighing means so that the total weight of the sheets stacked on the stacking means is within a predetermined range. The sheet length to be subsequently cut by the cutting device based on the weight of each sheet, and a control means for sending a signal to the cutting device to cut the sheet based on the calculated value, The control unit determines the number of sheets to be stacked on the stacking unit based on the total weight of the initial number of sheets to be stacked, and a sheet length determination circuit that sets the initial number of sheets to be stacked to a predetermined length. To disconnect with An initial sheet length setting circuit that sends a signal to the cutting device, and the last few sheets to be stacked when the number of sheets determined by the sheet number determination circuit is stacked on the stacking unit. The weight is predicted based on the total weight of the plurality of sheets weighed before the sheet currently weighed by the weighing means, and based on the predicted value, the sheet next to the sheet currently weighed by the weighing means is stacked. A final sheet length determining circuit for determining the sheet length to be stacked, and a final sheet to be stacked when the last previous sheet of the number of sheets determined by the sheet number determining circuit is weighed by the weighing means. Before cutting the sheet of No. by the cutting device, a signal is sent to the cutting device so as to cut the initial number of sheets to be laminated from the beginning, and the number of sheets before the sheet currently weighed by the weighing means is cut. Of based on the total weight of the sheet, the sheet weighing integrated apparatus characterized by having a final sheet length determination circuit for determining the end of the sheet length to be laminated.