JPS60211321A - Combinational measuring method of automatic measuring device - Google Patents

Abstract

PURPOSE:To improve combination precision by allowing two weighing machines selected as the best combination to be selected in only one group. CONSTITUTION:For example, 12 weighing machines W1A-W6B are arranged in six groups. Here, (a) shown that 11 weighing machines except the weighing machine W4B whose zero point is adjusted (zero adjustment) are combined while two weighing machines in the same group are selected as the best combination and articles are discharged from one of those weighing machines. Then, (b) shows that the weighing machines W2A and W2B in the same group are selected as the best combination, and the zero adjustment flag of one weighing machine W2A is set to ''H''. In this case, all of the 12 weighing machines are joined in combinational arithemtic. Further, (c) shows that the weighing machine W2A whose zero adjustment flag is set to ''H'' before is adjusted to zero and other 11 machines are combined without duplication. Thus, the combination precision is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a combination weighing method in an automatic measuring device that combines weighing data from a plurality of weighing machines and selects a weighing machine that provides an optimal combination.

(Prior art) Articles are supplied to weighing hoppers provided in each of a number of weighing machines, and a combination calculation is performed based on the weighing data from each weighing machine, so that the combined weight is the closest to the target weight within a set allowable range. A combination weighing type automatic weighing system that selects the optimal combination for the desired value and opens only the weighing hopper of the weighing machine that corresponds to the optimal combination to obtain the object to be weighed with the target weight or a weight close to it. A device is being developed.

In this automatic weighing device, the weighing hopper that discharges the objects to be weighed according to the optimal combination is supplied with the objects to be weighed for the next time from the pool hopper located on the L side.
In addition, articles are distributed and supplied from the storage section to the empty pool hopper.

FIG. 1 is a block diagram showing the general configuration of such an automatic weighing device. When a timing signal T is sent from a packaging machine (not shown) to an arithmetic control section 5 consisting of a microcomputer or the like, the arithmetic control section 5 receives a start signal. ST is given to the multiplexer 3, and the weighing data of the weighing machine 2 is
B is introduced into the A/D converter 4. The weighing data sent to the arithmetic control section 5 through the A/D converter 4 is combined with the combined weight value of the meter data and the target weight set by the target weight setting section 7 based on a combination pattern formed in advance. They are compared, an optimal combination is determined, and an operation signal is sent to the hopper drive unit l of the weighing machine corresponding to the knee combination. At this time, the optimal combination weight value is 1: A value that is less than or equal to the upper limit set by the limit setting section 6 is selected as the optimal combination.

The relationship between the pool hopper and the single-volume hopper is shown in Figure 2 (a).
The configuration is as shown in (b) and (c), and in Figure 2 (a), the A-side weighing hopper and the B-side weighing hopper are located below the A-side gate and B-side gate of the double-opening pool hopper. For example, when the A-side gate is opened, articles are weighed in the A-side weighing hopper, and when the weighing is finished, the articles are discharged to the outside. In FIG. 2(b), a sorting chute is arranged below the pool hopper, and the sorting chute is rotated left and right to supply articles to the A-side and B-side weighing hoppers.

Also, in Figure 2 (C), the pool hopper moves left and right and
Articles are supplied to the weighing hoppers on the side and B side.

Referring again to FIG. 1, in the case of FIG. 2(a), the signals sent from the arithmetic control unit 5 to the hopper drive unit 1 are the A-side gate open signals PIA to PnA of the pool hopper, and the B-side gate open signals PIA to PnA. The weighing machine 2 is divided into open signal PIB"Pn# and weighing hopper open signal q. In addition, the weighing machine 2 is divided into WIA, WIB...a e
Two units, WnA and WnB, constitute a pair, and 12 units, for example, are equally divided and arranged in a circle or in series.

(Problems with conventional technology) In such weighing machines, the zero point of the weighing machine naturally shifts due to ambient temperature, aging, etc., so zero point adjustment (hereinafter abbreviated as zero adjustment) is required to correct this. do)
is needed.

In the past, it was not possible to quantitatively determine under what conditions of use and over how long a period of use a zero point shift would occur, so it was necessary to periodically check the weighing machine, and during this period, the operation of the weighing machine had to be stopped. Therefore, there was a drawback that usage efficiency deteriorated.

In addition, an automatic weighing device in which two weighing hoppers are arranged for one pool hopper as shown in Fig. 2 has a ratio of one pool hopper to two weighing hoppers, that is, weighing machines, for obtaining weighing data. It has the advantage of obtaining twice as much measurement data. On the other hand, when two weighing machines of the same group are selected as the optimal combination and the articles are discharged from these weighing machines (hereinafter referred to as double discharge), two weighing cycles are required. There was a problem that the next article could not be supplied to the two weighing hoppers. For this reason, if there are many pairs of duplicate discharges, the number of weighing machines participating in the next combined weighing will decrease, the number of combinations will be limited, and the accuracy of the combined weighing will decrease. In order to avoid this, if double discharge is completely prohibited, the number of combinations in one measurement will be reduced, resulting in the problem that the number of weighing machines must be increased. Furthermore, after the double discharge, one of the weighing machines supplied the next time is again selected as the optimal combination and discharges the article, and the same weighing machine also discharges the article at the next weighing.
If one of the weighing machines in the same group is selected as the optimal combination one after another, there is a problem that the recovery operation of filling the empty weighing hopper with goods is prolonged, reducing the accuracy of the combination. (Objective of the Invention) The present invention provides an automatic weighing device in which two weighing machines are arranged for one pool hopper, in which both weighing machines in the same group are selected as the optimal combination. The purpose of this is to prevent a decrease in the number of combinations for the next calculation and improve the combination accuracy by allowing only one set. In addition, by detecting the previous discharge situation and prohibiting continuous double discharge, it is possible to speed up the recovery of double discharge weighing machines, and also to prevent double discharge when the weighing machine cannot supply goods. Another purpose of this system is to perform zero adjustment reliably by performing zero adjustment, and to enable effective use of the weighing machine without having to periodically stop it to perform zero adjustment. .

(Summary of the invention) The present invention arranges a plurality of sets of two weighing machines, calculates a combined weight value based on the weighing data from each weighing machine, and calculates a combined weight value that is closest to the scale weight. In a combination weighing method in an automatic weighing device in which the optimal combination that results in a value is determined and the goods are discharged from the weighing machine that corresponds to the optimal combination, the weighing machine that discharged the goods that corresponds to the optimal combination in the previous combination calculation is the same as - If two weighing machines are included in a group, the combination calculation is performed excluding combination patterns that include two weighing machines from the same group, and the weighing machines that correspond to the optimal combination are selected from the same group. Then, if only one weighing machine is selected and the goods are discharged, and the same set includes only one weighing machine that discharged the goods according to the optimal combination in the previous combination calculation. The calculation of combinations is performed using a combination pattern in which only one of the weighing machines in the same group is included, and a combination pattern in which only one set includes both two weighing machines, and 1 is selected as the optimal combination. Only when a combination pattern including two weighing machines in the same group is selected, one of the two weighing machines is selected, and the next combination is applied to the selected weighing machine. Zero point adjustment is performed during calculation, and at least the weighing machine that has undergone zero point adjustment does not participate in the combination calculation.

In the previous combination calculation, if two weighing machines are included in the same group that discharged goods according to the optimal combination, then if emphasis is placed on preventing the number of combinations from decreasing, one of the two weighing machines should be The combination calculation is performed with only one weighing machine not participating in the combination, and the zero adjustment is performed on the weighing machine.

Alternatively, if emphasis is placed on recovery of the weighing machine from double discharge, both the weighing machine that performs the zero point adjustment and the other weighing machine of the same set do not participate in the combination calculation.

(Example) The present invention will be described in detail below based on the figures.

[I] Example 1 FIG. 3 is an explanatory diagram of the first example of the present invention. An example will be explained in which 12 weighing machines, w, A-w6B, are arranged in six groups.

FIG. 3 (&) is an example in which 11 weighing machines other than the weighing machine W4B that executed the zero adjustment are allowed to participate in the combination without duplication. FIG. 3(b) shows an example in which the same pair of weighing machines W2 A and W2 B are selected as the optimum combination, and the zero adjustment flag of one of the weighing machines W2 and W2 is set to "H". In this case, all 12 weighing machines participate in the combination calculation. Figure 3 (C) shows the previous zero adjustment flag r
This is an example in which the weighing machine W2A designated as HJ performs zero adjustment, and the other 11 weighing machines participate in the combination without duplication. Figure 3 (
d) is an example in which the weighing machines Ws, 4, and Ws 11 of the same group are ejected by default, and the weighing machine W2B does not participate in the combination, but 11 weighing machines participate in the combination calculation. In this case, the metering rate of 11W for one side that was discharged in duplicate
The zero adjustment flag of sA is set to rHJ. Figure 3 (e
) is a weighing machine W5.4 with no double discharge and zero adjustment.
This is an example in which the weighing machine W2g does not participate in the combination, but 10 weighing machines participate in the combination calculation. Figure 3 (
f) is the same set of weighing machines W, i4. W55 is discharged in duplicate, and one of the weighing machines, W5B, has a zero adjustment flag.
In the example of "H", weighing machine W5B does not participate in the combination calculation, so 11 weighing machines participate in the combination calculation.

In this way, the feature of the first embodiment is that it is checked whether there is a duplicate in the previous discharge using the double discharge flag E, and if the previous discharge was with a double, the current combination calculation is only for the pattern without the double. This reduces the probability of an increase in empty weighing machines with no goods being supplied. When discharged without any overlap, combination calculation is performed with no overlap or 1 pair overlap.

The operation example shown in FIG. 3 can be summarized as shown in Table 1.

Table 1 Next, to explain how to set the combination pattern of weighing data, when there are n weighing machines, the total number of combinations is 2"-
However, in the present invention, out of this number of combinations, only one pair of weighing machines is selected as the optimal combination at the same time, and if there was no double discharge last time, If the previous discharge was a one-pair double, only the combination patterns with no double are selected.

The method of generating this combination pattern is as follows: (1) A counting method counter is incremented one after another, and a check is made for each increment to confirm whether there are any duplicates or one pair of duplicates.

(2) ROM storage method All patterns with no duplication and 1 pair duplication are stored in the ROM in advance, and the patterns are sequentially read out to generate the corresponding patterns.

(3) Bare printing part combination method As follows, a combination pattern is generated by combining patterns with no overlap and patterns with overlap in l pairs in units of l pairs in a branching manner.

Table 2 Among the methods (1) to (3) above, methods (2) and (3) generate combination patterns with no necessary duplication and only l-pair duplication, so they are efficient with no waste. It is a method. FIG. 4(a) is a diagram illustrating the number of combinations determined in this way. For example, the pattern in row a of two sets of weighing machines is the pattern a, b of one set of weighing machines without duplication, c.
The number of combinations in this case is indicated by ■.

In the three sets of a rows, there are 32=9 combinations of the non-overlapping patterns a + b + c of the first and second sets of weighing machines. Similarly, the number of combinations up to 6 is 3' = 2
It becomes 43. Figure 4(b) is a diagram comparing the number of combinations, and when there are 12 weighing machines, the total number of combinations is (2"-1
) = 4095. When 10 units, (2I6-1) =
The number of combinations is 1023, whereas the number of combinations when selecting only 1 pair of duplicates and 1 pair of duplicates is 2186 in the case of 12 weighing machines, and 647 in the case of 10 weighing machines.

Next, an example of a memory used in the present invention will be explained with reference to FIG. Figure 5(a) shows the weight memory for each weighing machine W.
IA-W6B (7) Metric data xlA to x6B are stored. FIG. 5(b) shows combination participation flags, in which flags TIA to T6jr are set to H or L corresponding to each weighing machine, and weighing machines whose flags are H are allowed to participate in the combination calculation. Figure 5 (
C) is the discharge flag, and the flag GtA corresponds to each weighing machine.
-G6- is set to H or L, the weighing hopper of the weighing machine whose flag is H is opened, and the article is discharged. Figure 5(d) shows the supply flags, and flags FIA to F6B are set to H for each weighing machine.
or L, the pool hopper of the weighing machine whose flag is H is opened, and the article is supplied to the weighing hopper. At this time, as shown in Figure 2 (
If you are using a double-opening pool hopper like the one shown in a), open the gate on the A side or the B side, and then open the gate on the A side or B side and
If you are using a sorting chute or a mobile pool hopper, switch between sorting and moving, respectively.

FIG. 5(e) shows a zero adjustment flag. Flag ZIA-2611 is set to H or L corresponding to each weighing machine, and the zero point adjustment of the weighing machine whose flag is H is performed. FIG. 5(f) shows the memory of the zero adjustment counter, which stores the number of discharges YIA to Y6 for each weighing machine. FIG. 5(g) shows a double discharge flag, and if the previous discharge was a duplicate, the flag E becomes rHJ.

FIG. 6 is a flowchart explaining the operation of the first embodiment. This flowchart will be explained below.

(1) Step 101 ■Clear all the zero adjustment counters Y to zero.

■Set all zero adjustment flags Z to rLJ.

■Set all combination participation flags to rHJ.

■Set the double discharge flag E to "L".

This sets the initial conditions for starting combination weighing.

(2) Step 102 All discharge flags G and supply flags F are set to "L".

(3) Step 103 Check whether the timing signal from the packaging machine is input to the arithmetic control section 5, and if so, proceed to the next step.

(4) Step 104 Input the weighing data XIA to X69 of each weighing machine wlA to W6B to the arithmetic control section 5.

(5) Step 105 The combination participation flag T is searched, and the weighing machine whose flag is "H" is allowed to participate in the combination. In the initial state, all 12 weighing machines participate in the combination. In addition, in this embodiment, the number of weighing machines participating in the combination is indefinite as shown in Table 1.

(6) Step 106 Check the double discharge flag, and if the flag is "H" due to the previous double discharge, proceed to step jll; if the flag is "L", proceed to step 107.

(7) Steps 111 to 115 If there was a duplicate discharge last time, check whether or not there is a duplicate in which two weighing machines of the same group are included in the combination pattern, and select only patterns with no duplicate. perform combinatorial operations. When the calculation is completed for all the patterns, the double discharge flag E is set to "L".

(8) Steps 107 to 110 If there was no duplicate discharge last time, select a pattern with no duplicate or one pair double from among the combination patterns,
Perform a combinatorial operation on all the patterns.

(9) Step 116 Compare the combined weight value determined by the combination calculation with the target weight, check whether there is an optimal combination of weighing machines, and if there is, proceed to step 117; if not, proceed to step 117. proceeds to step 120.

(10) Step 120 If there is no optimal combination, a supply flag F and a combination participation flag are sent to the weighing machine whose weighing data is below a predetermined weight for additional supply of goods, supply at startup, or refreshment. Both T and T are "H". However, in this case,
Exclude weighing machines whose zero adjustment flag Z is "H", and if both weighing machines in one pair have a specified weight or less, either one of the weighing machines, for example, the weighing machine with a lighter scale value. flag F
・Let T be r)(J.

(l l) Step 117 If there is an optimal combination, according to the pattern of the optimal combination,
Set the discharge flag G and supply flag F of the applicable weighing machine to "H"
Then, the supply flag corresponding to the weighing machine whose combination participation flag T is "L" is set to "H".

In this case, as shown in Fig. 3(e), there may be a weighing machine whose combination participation flag is rlJ even though all zero adjustment flags T are [LJ]. .

(12) Step 118 An open signal is output to the weighing hopper of the weighing machine whose discharge flag G is rHJ, and the zero adjustment counter Y corresponding to the weighing machine whose discharge flag is "H" is incremented by 1.

That is, the number of discharges is counted for each weighing hopper.

(13) Step 119 Let all combination participation flags T be rHJ.

(14) Step 121 For each weighing machine, check whether the zero adjustment flag Z is rHJ or not. If rHJ, proceed to step 122; if not rHJ, proceed to step 124.

(IV) Step 122 The weighing machine whose zero adjustment flag Z is rHJ has been selected as the optimal combination in the previous combined weighing and the article has been discharged from the weighing machine, and is stable, so this weighing machine is stable. Perform zero point adjustment for the

(16) Step 123 Set the zero adjustment flag 2 of the weighing machine that executed the zero adjustment to "L". At this time, the supply flag F of the weighing machine is set to step 1.
rHJ at 17, and the article is ready to be supplied at the next combined weighing.

(17) Step 124 Check for duplicates in the discharge flag Gi4 and GiB. If there are no duplicates, proceed to step 129; if there is a duplicate, proceed to step 125.

(+fl) Step 125 If there is a double discharge flag G, set the double discharge flag E to "H".

(19) Step 128 In the pair where the double has occurred, set the zero adjustment flag Z of the weighing machine whose zero adjustment counter Y has a larger count, that is, the one that weighed and discharged more, to "H". do.

(20) Step 127 The zero adjustment counter Y corresponding to the weighing machine whose zero adjustment flag is rHJ is cleared to zero, and the supply flag F of that weighing machine is set to "L".
”, then in the next combination weighing, the supply to this weighing machine will be prohibited and zero adjustment will be performed.

(21) Step 128 In order to make the weighing machine whose zero adjustment flag is "H" not participate in the next combination calculation, set the combination participation flag to "H".
L”.

(22) Step 129 Read and search the supply flags F in pairs for each loop of the program.

(23) Step 130 Check the supply flags FiA and FiB (24
) Step 131 Output the A-side gate opening signal PiA of the pool hopper Pi of the weighing machine whose supply flag FiA is rHJ.

(2 houses) Step 132 Outputs the B-side gate opening signal PiB of the pool hopper Pi of the weighing machine whose supply flag PiB is rHJ.

(26) Step 133 When the supply flags FIA and FiB are both "H", that is, when both weighing machines in the same group are empty and zero adjustment is not performed, the A of the pool hopper Pi of the corresponding weighing machine is Step 134 of outputting the side gate open signal PiA (2r'I) Following step 126, the combination participation flag T i B on the B side of the corresponding weighing machine is set to "L".

(2?) Step 135 Check whether the search for the supply flag is completed, and if the search is completed, execute the process from ■ again; if the search is not completed, step 135 The process returns to step 129 and repeats the subsequent processing.

[II] Example 2 In Example 1, there was a problem as shown in FIG. 3, although the frequency of occurrence was low. That is, (e)′, (
f) ′ are (e) in Figure 3, respectively.

This corresponds to (f), and in (e)', although there is no overlap, the discharge from the same group continues, so w2B has not recovered yet, and the weighing machines that do not participate in the combination are w2B and W5A. There are two machines. (f)' is an example of double discharge in which weighing machines w4A and w4β are both discharged before the double discharge weighing machine recovers, and two weighing machines W2B and W59 do not participate in the combined weighing. here,
Weighing machines W2 B and W5 B that did not participate in this weighing
and the other weighing machine W2, 4 of the same group. When W5A is selected as the optimal combination next time as well, the weighing machines that do not participate in the combination weighing as shown in (g) are w2 B , w4B , and w5B.
As a result, the number of non-participating weighing machines increases and the combination accuracy decreases.

For this reason, in the second embodiment shown in FIG. 7, when duplicates are discharged as shown in (b)', the two weighing machines of the same group are not allowed to participate in the next combination calculation. ,
This prevents the number of weighing machines not participating in the combination from increasing to three. In this way, the other weighing machine in the same group as the weighing machine that performs zero adjustment also strengthens the resilience of the weighing machine that becomes empty as it does not participate in the combination.

1st. A comparison of the characteristics of the second embodiment is as shown in FIGS. 7, 9, and 9.

(Effect of the invention) As explained above, according to the present invention, two weighing machines can be
When performing combined weighing using multiple sets of automatic weighing devices arranged as a set, only one set is allowed to have both weighing machines selected as the optimal combination in the same set. , the accuracy of combinations is improved by preventing a decrease in the number of next combinations.

In addition, in the calculation of the optimal combination, it is determined whether or not there was double discharge in which two weighing machines of the same set were included in the previous combination weighing, and the next time of double discharge is optimal from only combinations without doubles. Since the combination is selected to prevent continuous double discharge, the resilience of the weighing machine is strengthened.

Furthermore, since zero point adjustment is performed only the next time double discharge is performed for weighing machines that do not participate in the combination, zero point adjustment of the weighing machines can be performed rationally, and highly accurate and reliable automatic weighing can be performed. There is an advantage.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the automatic weighing device, a second explanatory diagram, Fig. 4 (a) and (b) are explanatory diagrams of combination patterns,
Figures 5 (a) to (g) are explanatory diagrams of the memory configuration;
FIG. 7 is a flowchart of the first embodiment, FIG. 7 is an explanatory diagram of the second embodiment, and FIGS. 8 and 9 are explanatory diagrams of the characteristics of each embodiment. l...Hump drive unit, 2...Weighing machine, 3...Multiplexer, 4...A/D converter, 5...Arithmetic control unit, 6...Upper limit setting unit, 7... -Target weight setting section. Patent Applicant: Ishida Kouki Seisakusho Co., Ltd. Agent: Patent Attorney: Minoru Tsuji (one other person) Figure 3 Hano 1) JP-A-211321 (10) Figure 4 of Kaya (Part 3) Procedural amendment (method) 1. Indication of the case 1982 Patent application No. 068290 2, Title of invention Combination measurement in automatic weighing device Method 3: Relationship with the case of the person making the amendment Patent applicant 4: Address of the agent: 3-14 Kanda Ogawa-cho, Chiyoda-ku, Tokyo 101 July 31, 1980 6. Explanation J column and drawing 7, contents of amendment (1) Specification, page 26, line 10 (7) “(a) ~
(g) Correct j to F (a) to (i) j. (2) ff(e)'j in Figure 3 (Part 2) of the drawing is "(
g) to j, If(f)'j to F (h)j, ``(g)
amend j to "(i) Jl, and attach the amended drawing as a separate sheet. Procedural amendment (voluntary) August 28, 1980 Patent application No. 068290 2, title of invention in automatic weighing device Combination measurement method 3, relationship with the case of the person making the amendment Patent applicant 4, agent address: 3-146 Kanda Ogawa-cho, Chiyoda-ku, Tokyo 101
Column 7 of Detailed Description of the Invention j of the specification to be amended, Contents of amendment (1) ff(e in lines 3 and 4 of page 24 of the specification)
)'j is corrected to ff(g)j. (2) In(f) on page 24, line 3 and line 8 of the specification
)'j is corrected to ``(h)j. (3) Specification page 24, line 14 c7) F (g)
Correct j to In (i) j.

Claims (3)

[Claims] (1) Arrange multiple sets of two weighing machines as one set, calculate the combined weight value based on the weighing data from each weighing machine,
In a combination weighing method in an automatic weighing device, in which the optimal combination is determined so that the combined weight value is closest to the target weight, and the article is discharged from the weighing machine that corresponds to the optimal combination, the article that corresponds to the optimal combination in the previous combination calculation is If there are two weighing machines in the same group that discharged the same amount, perform a combination calculation excluding combination patterns that include two weighing machines in the same group to find the optimal combination. The weighing machine that corresponds to ``i'' discharges the item so that only one weighing machine in the same group is selected, and the weighing machine that corresponds to the optimal combination in the previous combination calculation and discharges the item ``i'' is selected as the weighing machine that discharges the item i in the same group. Then, if only one weighing machine is included, the combination calculation will be performed on a combination pattern in which only one of the weighing machines in the same set is included, and a combination pattern in which only one set includes two weighing machines. If a combination pattern including two weighing machines of the same group is selected as the optimal combination, one of the two weighing machines is selected and the selected weighing machine is selected. A combination weighing method in an automatic weighing device, characterized in that zero point adjustment is performed on the weighing machine during the next combination calculation, and at least the weighing machine that has undergone the zero point adjustment does not participate in the combination calculation. (2) In the previous combination calculation, if there are two weighing machines in the same group that discharged articles according to the optimal combination, only the one weighing machine selected from the two weighing machines is included. The method for combining and weighing in an automatic weighing device according to claim 1, characterized in that the combination calculation is carried out by not participating in the combination. (3) In the previous combination calculation, if two weighing machines that discharged articles according to the optimal combination are included in the same group, the combination calculation is performed with those two weighing machines not participating in the combination. A combination weighing method in an automatic measuring device according to claim @(1), characterized in that: