JPH0619289B2 - Constant weight supply method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a constant weight supply method for collecting a plurality of articles in an article receiving section at substantially constant weights.

[Prior art]

Conventionally, the above-mentioned constant weight supply method includes a so-called combination weighing method. It weighs articles with n weighing devices each, and outputs n weighing signals from these weighing devices (2 ⁿ
-1) Each of the combinations is selected, and a combination whose total weight is equal to or closest to the predetermined weight is selected from these (2 ⁿ -1) combinations, and the selected combination is configured. The articles are taken out from the weighing device and collected in one article receiving section.

[Problems to be solved by the invention]

However, in the above combination weighing method, n weighing signals must be combined in (2 ⁿ -1) ways, the time required for this combination is long, and the articles are collected in the article receiving unit per unit time. There was a problem that the number of times was reduced. This problem can be solved by using a high-quality computer, but there is a new problem that the cost of the device increases.

[Means for solving problems]

The means for solving the above-mentioned problem has n allowable weight ranges (n is a positive natural number of 2 or more) in which the central value increases in order from the first and the allowable ranges do not overlap each other. . Then, an article whose weight falls within the first allowable weight range is selected from the articles supplied in order, and the selected article is stored in the article receiving section. Next, the added value of the weight of the articles in the article receiving section (the weight within the first allowable weight range) and the weight of the articles sequentially supplied is
When the weight falls within the second allowable weight range, the article is supplied to the article receiving section. Then, when the added value of the weight of the articles in the article receiving section (the weight within the second allowable weight range) and the weight of the articles sequentially supplied falls within the third allowable weight range, The article is stored in the article receiving section. Thereafter, similarly, the accommodation of the articles is repeated until the n-th allowable weight range is reached.

[Work]

According to this means, first, the article within the first allowable weight range is searched and placed in the article receiving section. An article that is within the second allowable weight range together with the article in the article receiving section is searched for and placed in the article receiving section. Thereafter, in the same manner, articles that fall within the n-th allowable weight range are stored in the article receiving section.

〔Example〕

First, the apparatus used in this embodiment is shown in FIGS.
Description will be given with reference to the drawings. In FIG. 3, reference numerals 2 and 4 are pulleys, and a chain 6 is stretched between the pulleys 2 and 4. Receiving metal fittings 8 are attached to the chain 6 at equal intervals.
Is installed. The pulley 2 is rotated in the direction of the arrow by a motor (not shown).

A load cell 12 is provided in the upper portion of the chain 6 and weighs the articles supplied from the supply position A to the carrier 10. The analog weighing signal from the load cell 12 is converted into a digital weighing signal by the A / D converter 14 as shown in FIG. 4, and is supplied to the microcomputer 16.

A rotary disc 18 is also provided on the drive shaft of the motor coupled to the pulley 2. The rotating disk 18 is provided with holes 19 in the same number as the number of the carrying devices 10. The front and back of the rotating disk 18 have a pulse generator 20 (a transmitter and a receiver in FIG. 3). (Not shown). Therefore, the pulse generator 20 generates the timing pulse T every time the carrier 10 advances by one pitch. The timing pulse T is input to the microcomputer 16 as shown in FIG.

In the lower part of the chain 6, there are five supply drive units 20a, 20
b, 20c, 20d, 20e are provided. Below the supply drive units 20a to 20d, the article receiving unit 22 is provided.
a, 22b, 22c, 22d are arranged, and a discharge section (not shown) is arranged below the supply drive section 20e. These supply driving units 20a to 20e operate in response to a signal from the microcomputer 16 and are carried to the corresponding article receiving unit by the carrier 10.
Supplies goods.

Gates 24a to 24 are provided below the article receiving portions 22a to 22d.
d is provided. These gates 24a to 24d are opened and closed by gate driving units 26a to 26d, and the gate driving units 26a to 26d operate according to a signal from the microcomputer 16.

In addition, from the position corresponding to the load cell 10, the supply drive unit 20
There are (n + 4) carriers 10 up to the position corresponding to e. That is, the position corresponding to the supply drive unit 20a is n. N + 4 areas have been obtained in the RAM of the microcomputer 16 so as to correspond to the respective transporters 10. These areas are configured to store the weights of the above-mentioned (n + 4) articles of the carrier 10, and the stored weights are sequentially moved to the adjacent areas. Hereinafter, these n + 4 regions will be referred to as shift registers 28 for convenience of description, and each region will be referred to as each stage of the shift register 28 as shown in FIG. Further, in the RAM, five areas provided so as to correspond to the nth to (n + 4) th transporters 10 are acquired. These five areas are configured so as to be able to store the discrimination result, which will be described later with reference to FIG. 1, and the stored discrimination results can be sequentially moved to the adjacent areas. Below, these six areas are
As shown in the figure, it is called a shift register 30, and each area is called each stage of the shift register 30.

In this example, 398.4 is obtained by collecting four articles having a center value of 100 g.
Items in the range from 40 g to 401.6 g are stored in the respective article storage units 22a, 2
It is intended to supply to 2b, 22c and 22d. Therefore, 100 ± 3g, 200 ± 1.1g, 300 ± 1.4g, 400
Define the first to fourth allowable weight range of ± 1.6g,
First of all, the articles whose weight is within the range of 100 ± 3 g are supplied to one article receiving part, for example, 22a among the articles sequentially supplied,
Next, the accumulated value of the weight of the previously supplied one item is 20
The article receiving section 22a supplies an article within the range of 0 ± 1.1 g, and the article receiving section 22a stores an article whose accumulated value with the weight of the two previously supplied articles falls within the range of 300 ± 1.4 g. 22a, and the cumulative value of the weight of the three previously supplied items is
Articles within the range of 400 ± 1.6 g are supplied to the article receiving section 22a, and when four articles are collected, they are discharged from the article receiving section 22a.

In this embodiment, the supply of such articles is parallel to the four article receiving portions 22a to 22d. this is,
This is because if only one article receiving section is used, many articles will be lost. Further, the larger the central value of each allowable weight range, the smaller the allowable range is to increase the accuracy.

The program of the microcomputer 16 will be described below with reference to FIGS. 1 and 2. In addition, carrier
The central value W _{S of the} articles supplied to 10 is 100 g, the first allowable deviation range ΔW ₁ is ± 3 g, and the second allowable deviation range Δ is 1.
W ₂ ± 1.1 g, the third allowable deviation range ΔW ₃ ±
1.4g, 4th allowable deviation range ΔW ₄ ± 1.6
g, the allowable lower limit value W _L is 97 g, and the allowable upper limit value W _H is 103 g, and counters C _{O to} C ₃ and weight accumulation registers R _{O to} R ₃ corresponding to the article receiving units 22a to 22d are set.
It is assumed that the n, m, l and p registers are initially reset.

First, drive the motor as shown in Fig. 1 (step 5
0), carry the carrier 10. And the timing pulse T
Is determined (step 52). If NO, repeat step 52 until YES. If YES, then the load cell 12 is loaded with the article carrier 10 and the load cell 12 produces an analog weighing signal. This analog weighing signal is sent to the A / D converter 14
Is converted into a digital weighing signal W _D. This digital weighing signal W _D is input (step 54), the shift registers 28, 30 are shifted right by 1 (step 56), and the digital weighing signal W _D is input to the first stage 281 of the shift register 28 (step). 58).

Then, reading the stored value W _O of the n-th stage 28n of shift register 28 (step 60). This stored value W _O is the weight of the article being supplied to the carrier 10 above the article receiving section 22a as shown in FIG. Currently, since the carriage 10 is empty, W _O is 0. If W _O is W _L or more and W _H
It is judged whether or not the following (step 62). However, since W _O is 0 as described above, this determination is NO,
Set the first stage 30n of the shift register 30 to 5 (step
64).

Next, as shown in FIG. 2, the first stage of the shift register 30
It is judged whether the stored value of 30n is 1 (step 66),
That is, it is determined whether the article in the carrier 10 above the article receiving section 22a is to be accommodated in the article receiving section 22a, but since it is NO, it is determined whether the second stage 30 (n + 1) is 2 (step 68). ). That is, it is determined whether the article in the carrier 10 above the article receiving section 22b is to be accommodated in the article receiving section 22b.
Therefore, it is determined whether the third stage 30 (n + 2) is 3 (step 70). That is, it is determined whether the article in the carrier 10 above the article receiving section 22c is to be stored in the article receiving section 22c.
Since this judgment is also NO, the fourth stage 30 (n + 3) is 4
(Step 72). That is, the article receiving section
It is determined whether the article in the carrier 10 above 22d is to be accommodated in the article receiving section 22d. Since this judgment is also NO, the fifth step 30
It is judged whether (n + 4) is 5 (step 74), that is, it is judged whether the article in the carrier 10 above the discharging part (not shown) is discharged, but since it is NO, it is judged whether it is the end (step 76). . Now that the answer is NO, the process returns to step 52 in FIG. Similarly, the weight of the articles weighed by the load cell 12 is sequentially stored in each stage of the shift register 28.

For example, it is assumed that 98.3 g is stored in the n-th stage 28n of the shift register 28 for the first time in this way. As a result, step 62 becomes YES and it is judged whether the counters C _{O to} C ₃ are all 0 (step 78). Since this determination is YES, the first stage 30n of the shift register 30 is set to 1 (step 8).
0). As a result, the first allowable weight range (97-103g)
It is detected that the article of # 1 has reached the article storage unit 20a for the first time.

Next, step 66 is executed. However, as shown in Table 1, the first stage 30n of the shift register 30 is 1, so the counter C
Step _O one step (step 82) and enter the weight accumulation register R _O
Accumulate 98.3g (step 84). Then, the operation signal is supplied to the supply drive section 20a (step 86). As a result, 98.3 g of articles are loaded into the article receiving section 22a. Next, it is determined whether the count value of the counter C _O is 4 (step 87), but since it is NO, it is determined in step 68 whether the n + 1th stage of the shift register 30 is 2. But Table 1
Since the (n + 1) th stage is 0, as shown in FIG. Thereafter, similarly, step 74 is executed through step 72, but since this determination is YES, the supply drive unit 20
The operation signal is supplied to e (step 75). However, since the carrier 10 on the discharge section is empty, no articles are supplied. After that, it returns to step 52 through step 76.

Then by doing steps 54, 56, 58, 60,
As shown in Table 2, the stored value 98.3 of the nth stage 28n of the shift register 28 is the (n + 1) th stage 28 (n + 1), and the stored value "1" of the first stage 30n of the shift register 30 is the second stage 30 ( n + 1)
Shift to each. Then, it is assumed that 99.5 g is newly shifted to the nth stage 28n of the shift register 28.

Then, through steps 62 and 78, the value of the n register is set to a value obtained by adding 1 to the count value of the counter C _O (currently 1) (step 88), and the stored value of the weight accumulation register R _O (currently 9).
The value obtained by adding the storage value (currently 99.5 g) of the nth stage 28n of the shift register 28 to 8.3 g) is nW _s −ΔW _n (currently n is 2).
Therefore, it is 2W _s −ΔW ₂ , that is, 198.9 g or more, and nW _s + ΔW _n (currently 2W _s + ΔW ₂ , that is, 201.
1g) or less, that is, when the article of the carrier 10 currently above the article receiving section 22a is supplied to the article receiving section 22a, the second
It is judged whether it is within the allowable weight range of (step 90). However, since it is NO, the value of the m register is counted by the counter C ₁
1 is added to the count value (currently 0) of 1 (step 92), and the value stored in the weight accumulation register R ₁ (currently 0 g)
The value stored in the nth stage 28n of the shift register 28 (currently 99.5
The sum of 99.5 g is mW _s −ΔW _m (currently m is 1).
Therefore, W _s −ΔW ₁ , that is, 97 g) or more,
And mW _s + ΔW _m (currently W _s + ΔW ₁ , that is, 103 g)
If it is the following, that is, if the article of the carrier on the article receiving section 22a is supplied to the article receiving section 22b, it is judged whether it is within the first allowable weight range (step 94). Since this judgment is YES, 2 is stored in the first stage 30n of the shift register 30 (step 96), the counter C ₁ is incremented by 1 (step 98), and W _O is stored in the weight accumulation register R _1. Accumulate (step 100) and move to step 66.

As is clear from Table 2, the judgments at steps 66, 68, 70 and 72 are all NO, and the result at step 74 is YES.
Execute step 76 via step 75. If step 76 is also NO, steps 52, 54, 56, 58 and 60 are executed.

As a result, as shown in Table 3, the stored value 98.3 of the (n + 1) th stage 28 (n + 1) of the shift register 28 becomes (n +
2) In the 28th stage (n + 2), the stored value 99.5 of the 28th stage 28n is (n
+1) stage 28 (n + 1), shift register 30 second stage
The stored value 1 of 30 (n + 1) is shifted to the third stage 30 (n + 2), and the stored value 2 of the first stage 30n is shifted to the second stage 30 (n + 1). Then, it is assumed that 100 g is newly shifted to the nth stage 28n of the shift register 28.

Through the step 62 and 78, the count value value of the counter C _O of n registers in step 88 stores the value obtained by adding 1 to the (now 1) (currently 2), cumulative weight accumulation register R _O at step 90 The value 198.3 obtained by adding the stored value 100 g of the nth stage 28n of the shift register 28 to the calculated value (currently 98.3 g) is nW _s −ΔW _n
(Currently 198.9 g) and above, nW _s −ΔW _n (currently 20
1.1 g) or less, that is, if an article above the article receiving portion 22a is supplied to the article receiving portion 22b, it is determined whether or not it is within the second allowable weight range. A value 1 (currently 2) obtained by adding 1 to the count value of the counter C ₁ (currently 1) is stored in the register, and the accumulated value of the weight accumulation register R ₁ (currently 99.5 g) is stored in step 94.
The value obtained by adding the stored value 100g of n-th stage 28n of shift register 28 199.5 g is, mW _s -ΔW _m or shall apply in (current 198.9G) or nW _s + [Delta] W _m is (current 201.1G) below that is, When the article above the article receiving section 22a is supplied to the article receiving section 22b, it is determined whether the article is within the second allowable weight range. Since this determination is YES, the first stage 30n of the shift register 30
Is set to 2 (step 96), the count value of the counter C ₁ is incremented by 1 (step 98), and the stored value of the nth stage 28n of the shift register 28 is accumulated in the weight accumulation register R ₁ (step 100). ).

Then, step 66 is executed, but as is clear from Table 3, this judgment is NO, so step 68 is executed. Since this determination is YES, an operation signal is supplied to the supply drive section 20b (step 102), and thereby the article is supplied to the article receiving section 22b from the carrier 10 above it.
Then, whether or not the count value of the counter C ₁ is 4 is judged (step 104), but since it is NO, the procedure returns to step 52 through steps 70, 72, 74 and 76 as described above.

By executing steps 52 to 60, the stages of the shift registers 28 and 30 are respectively shifted as shown in Table 4,
It is assumed that 97 g is newly shifted to the nth stage 28n of the shift register 28.

Receiving section 22a at steps 88 and 90 after passing through steps 62 and 78.
Then, it is judged whether or not the article in the carrier 10 above can be supplied. However, since NO is out of the second allowable weight range, the step is determined.
At 92, 94, the article receiving section is provided for loading the articles of the carrier 10 above the accommodation section 22a.
I will judge if it can be supplied to 22b, but if it is 296.
It becomes 5 g, which is out of the range of the permissible range mW _s ± ΔW _m (the present permissible range of m is 3 and therefore the third permissible weight range of 300 ± 1.4 g), and therefore NO.

Next, in steps 106 and 108, it is determined whether the article in the carrier 10 above the article container 22a can be supplied to the article container 22c. If supplied, it will be 97g, which is within the allowable range lW _s ±
ΔW _l (Currently, l is 1, so the first allowable weight range is 100 ±
Since it is within the range of 3 g), it becomes YES. Therefore, 3 is stored in the first stage 30n of the shift register 30, and the counter C
The count value of ₂ is incremented by 1 and 97 is added to the weight accumulation register R ₃ .
Accumulate g (steps 110, 112, 114).

Then, step 66 is executed, but as is clear from Table 4, the result is NO, and step 68 is executed. This judgment is Y
Since it is ES, the article container 22b is connected by the step 102.
Then, the goods are supplied from the carrier 10 above it, and the step 10
Return to step 52 via steps 4, 70, 72, 74, 75, 76.

After that, it is assumed that the stages of the shift registers 28 and 30 are shifted as shown in Table 5 through steps 54, 56, 58 and 60, and 99.6 g is shifted to the nth stage 28n of the shift register 28.

After steps 62 and 78, steps 88 and 90 are executed.
If this article is supplied to the article container 22a, the accumulated value becomes 197.9 g, which is outside the second allowable weight range 200 ± 1.1. Therefore, the determination is NO, and steps 92 and 94 are executed. If this article is supplied to the article accommodating portion 22b, the accumulated value is 299.1 g, and the third allowable weight range is 3
It falls within the range of 00 ± 1.4g. Yes, yes
Step 96 is executed, and the first stage 30 of the shift register 30
2 is stored in n, steps 98 and 100 are executed, the count value of the counter C ₁ is incremented, and 99.6 g is accumulated in the weight accumulation register R ₁ .

Then, steps 66, 68, 70, 72, 74 and 76 are executed, but as is clear from Table 5, these judgments are NO, and the process returns to step 52.

After that, steps 52 to 60 are executed. As a result, as shown in Table 6, each stage of the shift registers 28 and 30 is shifted, and 97.4 g is stored in the nth stage 28n of the shift register 28.

Then, through steps 62 and 78, steps 88 and 90 are executed. If this article is supplied to the article container 22a,
The accumulated value is 195.7g, and the second allowable weight range is 200 ± 1.
It is out of the range of 1 g. Therefore, this judgment is NO,
Steps 92 and 94 are executed to determine whether the product can be supplied to the article storage section 22b. If supplied, cumulative value is 386.5g
Is out of the fourth allowable weight range of 400 ± 1.6 g. Therefore, this judgment is NO. Then step 10
By executing steps 6 and 108, it is determined whether this article can be supplied to the article container 22c. If supplied, the accumulated value is 194.4g
The second allowable weight range is 200 ± 1.1 g, which is outside the range. Therefore, this judgment is NO. Then step 11
At steps 6 and 118, it is determined whether this article can be supplied to the article container 22d. If supplied, the accumulated value will be 97.4g, the first
The allowable weight range is 100 ± 3g. Therefore, 4 is stored in the first stage 30n of the shift register 30 (step
120), and the counter C ₃ is incremented by one (step 122),
Accumulate 97.4 g in the weight accumulation register R ₃ . (Step 1
twenty four). If the determination at step 118 is NO, at step 64, 5 is stored in the first stage 30n of the shift register 30.

Next, step 66 is executed. However, as is clear from Table 6, since it is NO, step 68 is executed. This is Y
Since it is ES, the step 102 is executed, and the article storage unit 2
2b is fed with the articles of the carrier 10 above it. Step 104
After that, step 78 is executed. Since this is YES, an operation signal is supplied to the supply drive section 20c at step 126, and the article of the carrier 10 above it is supplied to the article storage section 22c. Then, in step 128, it is judged whether or not the count value of the counter C ₂ is 4, but since it is NO, steps 72, 7
Return to step 52 through steps 4 and 76.

After that, steps 52 to 60 are executed. As a result, each stage of the shift registers 28 and 30 is shifted as shown in Table 7, and 99.4 g is shifted to the nth stage 28n of the shift register 28.

Then, through steps 62 and 78, steps 88 and 90 are executed. If this article is supplied to the article container 22a,
The accumulated value is 197.6g, and the second allowable weight range is 200 ± 1.
It deviates from 1g. Therefore, this determination is NO, and steps 92 and 94 are executed. If this item is
When it is supplied to 22b, the accumulated value becomes 398.5 g, which is within the range of the fourth allowable weight range 400 ± 1.6 g, and the result is YES. Therefore, in steps 96, 98, 100, shift register 3
2 is stored in the first stage 30n of 0, the counter C ₁ is incremented by _1, and 99.4 g is accumulated in the weight accumulation register R ₁ .

Then, step 68 is executed via step 66. Table 7
As is clear from this judgment is YES, the step
At 102, the article is supplied to the article container 22b from the carrier 10 above the article container 22b. Next, step 104 is executed, but since the result is YES, the counter C ₁ and the weight accumulation register R ₁ are reset (step 130), and an operation signal is supplied to the gate drive unit 26b (step 132). As a result, the article container 22b
All the articles inside are discharged. Thereafter, the same operation is performed.

Note that, as described above, the article storage units 22a, 22c, 22d
When the articles are loaded four times each, the step
134, 136, 138, 140, 142, 144 are executed and ejected. Further, when the carrying device 10 on which the article to be supplied is placed is located above the article housing portion 22d, the steps 72 to 146, 148 are provided.
Is executed and supplied.

In the above embodiment, the carrying device 10 conveys only one article, but a plurality of articles may be conveyed. Also, the article receiving section is 4
Although two are provided, the number can be arbitrarily increased or decreased. Further, although the allowable weight range is set to 4 steps, this can also be arbitrarily increased or decreased.

The above embodiments are all performed automatically, but some can be performed manually. For example, the chain and the carrier are abolished, four sub scales are provided in place of the article receiving section, each of the above four allowable weight ranges is set for each sub scale, and a lamp is provided for each sub scale. Then, a parent scale is separately provided, and the article is weighed by this. And
The lamp of the sub scale to be supplied is turned on based on the measured value. Manually transfer the articles from the parent scale to the illuminated slave scale. When the total weight of the supplied articles falls within the fourth permissible weight range, the lamp is blinked for manual discharge, or the slave scale is automatically tilted and discharged. Further, in place of the slave scale, a hopper having no weighing device, an accumulating means and a counter are respectively provided, the detector detects that the article is taken out from the master scale, and the accumulating means corresponding to the hopper to be supplied accumulates. Alternatively, the counter may be incremented by one when the calculation is performed, and when the count value of the counter reaches a predetermined value, it may be discharged from the hopper.

[Effect]

As described above, according to the present invention, it is used to determine whether the cumulative value of the weight of the supplied articles and the weight of the already selected articles falls within a predetermined allowable weight range. The configuration of the arithmetic circuit can be simplified and the manufacturing price can be reduced.

[Brief description of drawings]

FIG. 1 is a partial flow chart of one embodiment of the present invention,
2 is the remaining flow chart of the same embodiment, FIG. 3 is a schematic view of the apparatus used in the same embodiment, FIG. 4 is a block diagram of the apparatus used in the same embodiment, and FIG. 5 is used in the same embodiment. FIG. 6 shows a shift register of the device. 22a to 22d ... Article receiving section.

Claims (1)

[Claims] 1. An n (n is a positive natural number of 2 or more) permissible weight range in which the central value increases in order from the 1st and the permissible ranges do not overlap with each other is determined, A step of selecting an article into which the weight is to be supplied from a plurality of articles that are sequentially supplied, and storing the selected article in the article receiving section, and the weight of the article in the article receiving section and the article that is sequentially supplied. Constant weight supply method including the step of repeating the step of supplying the article to the article receiving section when m is 2 to n when the value added to the weight is within the m-th allowable weight range.