JPS61269026A - Removal of zero-point abnormality for combination weighing apparatus or combination counter - Google Patents

Abstract

PURPOSE:To prevent the lowering of the operating efficiency of a combination weighing apparatus due to zero-point abnormality, by automatically eliminating goods jammed or attached from a weighing hopper when the zero point deviates over a specified weight. CONSTITUTION:The weight W1-Wn of goods weighed with a plurality of weighing machines A is inputted into a multiplexer B. When a timing signal from a packing machine H is inputted into a arithmetic control section D, it D sends a changeover signal to the multiplexer B. The weight W1-Wn is outputted sequentially to an A/D converter to be converted into a digital signal and then, memorized into a specified area of a memory E at the arithmetic control section D. At the memory E, the upper limit weight Wu set by an upper weight setting section F and the target weight Ws set by a graduation weight setting section G are memorized into the respective areas beforehand. When the weight change (deviation) in the zero point exceeds a specified value, a opening command signal is outputted to a weighing hopper driving section of the corresponding weighing machine to eliminate goods attached to the weighing hopper or jammed thereinto and thus, the cause of zero-point abnormality is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is a combination weighing device or a combination counting device in which the cause of the abnormality is eliminated by opening and closing the weighing hopper when a zero point abnormality occurs. This invention relates to a zero point abnormality elimination method.

(Prior art) Articles are divided and weighed using multiple weighing machines, and the weight of the articles obtained by each weighing machine is inputted to an arithmetic control unit composed of a microcomputer, etc., and the items are combined according to a preset combination pattern. 2. Description of the Related Art A combination weighing device is known that performs calculations to find a discharge combination that satisfies a predetermined condition for a target weight, and discharges the article from the corresponding weighing machine.

Also, calculate the number of items by dividing the weight by the weight (unit weight) per item, calculate the combinations using one combination pattern, find the discharge combination that satisfies the predetermined conditions for the target number, and use the applicable weighing machine. Single-combination counting devices adapted to eject articles are also known.

In such a combination weighing (counting) device, when the zero point of each weighing device deviates by more than a predetermined weight, an alarm is displayed and the device is stopped.

The causes of zero point abnormality are as follows.

(1) Malfunction of the weighing hopper, weight sensor, etc. of the weighing machine.

(2) Attachment of articles to the weighing hopper Figure 2 (a) is an explanatory diagram illustrating the attachment of articles to the weighing hopper, and the articles weighed in figure (a) are shown in figure (b).
When the gate opens as shown in the figure (C), the goods are discharged.
In some cases, items may remain attached.

(3) The article is caught in the gate of the weighing hopper.

FIG. 2(b) is an explanatory diagram illustrating the loading of articles into the weighing hopper, and the articles weighed in FIG. 2(a) are shown in FIG.
Either open the gate as shown in b) and discharge the goods, or
As in e), when returning the gate, an article may get caught in the gate.

(Problems with conventional technology) When such a zero point abnormality occurs, in order to eliminate the cause, (1) Repair the malfunctioning part of the weighing hopper, weight sensor, etc.

(2) Scrape off items stuck to the weighing hopper.

(3) Manually open the weighing hopper gate and remove the trapped items.

etc. will be required.

However, there are many cases where several to several dozen combination weighing devices or combination counting devices are installed in one factory, and one
~ When several workers are operating and monitoring these devices, it takes time to discover zero-point abnormalities, and when the device stops due to an abnormality, one worker has to eliminate the cause of the abnormality. The operating rate of the device decreases until it is restarted. Furthermore, the burden on the worker increases in order to eliminate the cause of the abnormality.

For example, if it takes 5 minutes to discover that the device has stopped, and 4 minutes to eliminate the cause of the abnormality, a combination weighing device with a capacity of 60 times per minute would have a reduced throughput of 540 packs. It turns out.

(Objective of the Invention) The present invention focuses on the fact that most of the causes of zero point abnormality are the adhesion of articles to the weighing hopper and the getting of articles into the gate of the weighing hopper, and the present invention aims to solve in case of,
The object of this invention is to automatically remove adhered or stuck articles from the weighing hopper to prevent a decrease in operating efficiency of a single combination weighing device or combination counting device due to zero point abnormality.

(Summary of the Invention) The zero point abnormality elimination method in a combination weighing device or combination counting device of the present invention involves weighing the weight of an article using a plurality of weighing machines, and calculating the combination of the weights obtained by each weighing machine using a combination pattern. Then, select a combination that satisfies predetermined conditions for the target weight as a discharge combination, and use a combination weighing device that discharges the article from the corresponding weighing machine, or calculate each weight as a weight (unit weight) per article. Find the number of items for each weighing machine by dividing and converting to the number of items, calculate the combination of each item using the combination pattern, and select the combination that satisfies the predetermined conditions for the target number of items as the discharge combination! Association ``'1''i that selects and discharges goods from the applicable weighing machine
! '''tl'r, 12'''''m-m-5fEai
,..., when performing zero point adjustment for at least one of the weighing machines, if there is a zero point abnormality in which the zero point deviates by more than a predetermined weight, the supply of goods to the weighing machine will be prohibited. , the cause of the zero point abnormality is eliminated by opening the weighing hopper. Further, after the opening operation of the weighing hopper, the zero point deviation is checked again, and if the zero point deviation is within a predetermined weight, the zero point adjustment is performed on the weighing machine IS, and then the article is supplied. It is something.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram of a combination weighing device that implements the zero point abnormality elimination method according to the present invention.

In the figure, the weights Wl -Wn of articles weighed by a plurality of weighers alA are input to a multiplexer B. When the timing signal from the packaging machine H is input to the arithmetic control section composed of a microcomputer etc., the arithmetic control section sends a switching signal to the multiplexer, and each weight W1-Wn
are sequentially output to an A/D converter, converted into digital signals, and stored in a predetermined area of the memory E of the arithmetic and control unit. Me1 % +) E K tyo1, □□□,
, R□□yo.

Weight W u , target type f set by target weight setting section G
iWs are stored in each area in advance. Further, the memory E is provided with a measurement number count memory, a wood-tone second concave flag, a zero-adjustment count memory, a wood-tone flag, a supply flag, etc., the functions of which will be described later.

For each weight of the digital value input to the calculation control section, a combination calculation is executed according to a combination pattern to find a combination that satisfies a predetermined condition for the target weight.
A set of weighing machines is selected as a discharge combination, and articles are discharged from the corresponding weighing machines.

If the zero point change weight (deviation) exceeds a predetermined value, an open command signal is output to the weighing hopper drive section of the weighing machine, removing objects that have adhered to or caught in the weighing hopper and removing the cause of the zero point abnormality. eliminate.

FIG. 3 is a flowchart showing the processing procedure of an embodiment of the present invention. Next, this flowchart will be explained.

(1) Check whether the timing signal from the packaging machine is correct or not (Step S1). If there is a timing signal, check whether the wood tone flags are rHJ (step S2). If all the wood tone flags are rLJ. In step S3), input the weights of all the weighing machines in sequence and memorize them. Then, perform a combination calculation using each weight to find a set of discharge combinations that are equal to or close to the target weight, with the target weight or more and the upper limit weight or less. Determine (Step 54) Next, it is checked whether the discharge combination has been determined (Step S5). If the discharge combination has not been determined, other processing such as additional supply of articles is performed.

(2) When a discharge combination is determined, an open command signal is output to the weighing hopper drive unit of the weighing machine selected for the discharge combination, the weighing hopper is opened, and the article is discharged (step 5).
day), then set the supply flag to “H” according to the discharge combination.
Step S7), add 1 to all zero adjustment count memory values (Step 5EI), then check whether the value in the weighing frequency count memory is 0 or not (Step S7).
9) If the value of the weighing count memory is not 0, set the value of the weighing count memory to -IL (step 5IG).
, supplies the article to the weighing hopper of the weighing machine whose supply flag is rHJ, and sets all supply flags to "L".

(3) If the value of the weighing frequency count memory is O, the wood tone flag corresponding to one of the weighing machines selected for the discharge combination with the largest value of the zero adjustment count memory is set to rHJ (step 312), then the supply flag corresponding to the wood tone flag rHJ is set to "L" (step 315), and the zero tone count memory corresponding to the wood tone flag is cleared to zero. (Step 514) +1 followed.

Store a predetermined value 1, for example, "4" in the total N count memory (step 315) (4) In step S2, if the wood tone flag is and rHJ, the wood tone flag is
□ Input the weight of the weighing machine, that is, the weight of the weighing machine in an empty state with no articles being fed into the weighing hopper, and find the amount of change in the zero point (shift fl) (step 516) 1. Check whether the amount of change is within a predetermined weight (step 5IT), and if the amount of change is within a predetermined weight, execute zero point adjustment for the weighing machine with the electric control flag set to rHJ (step 518). key flag is rHJ
Set the supply flag of the weighing machine to rHJ (Step 5ts)
, set this electric tone flag and electric tone 2nd concave flag to “L” (
Step 520) - After that, the processing from step Si5 onwards is performed.

(5) Step Sl? In step S2t), if the amount of change in the zero point exceeds the predetermined weight, check whether the electric controller 2 concavity flag is rHJ.
If this flag is rHJ, an alarm is displayed (step 52!l) and the apparatus is stopped. When the electric controller 2nd concave flag is not rHJ, the buzzer is activated for 1 second to notify the zero point abnormality (step 322). Next, the electric controller 2nd concave flag is set to rHJ (step 5215), and the electric controller flag is set to rHJ. By outputting an open command signal to the weighing hopper drive part of the rHJ weighing machine to open and close the gate of the weighing hopper, and by photographing the opening and closing of the gate, it is possible to remove objects stuck to or caught in the weighing hopper and eliminate zero point abnormalities. Eliminate the cause (step 524).

To summarize the above, when "4" is stored in the measurement count memory, the operation is as follows.

(1) Repeat the process of step st""stt three times.

(2) For the fourth time, after the processing of steps S'' to S9, steps St2 to S1! +511 processing is performed.

(3) For the fifth time, after the processing of steps S, , S2, the process moves to step S l B + 317, and by the condition check of step S17, (a) From steps 518 to S2°, the processing from step S5 onward is performed. Do the following.

(b) From steps 321 to S24 to steps S□, S
2 r S On the 1st, perform the process in S17 and check the conditions in step 517 again.

(a) Processing from steps 318 to S2o to step S3 is performed.

(b) The apparatus is stopped by steps S21+S25.

In the above example, the device is stopped when the zero 112nd flag is rHJ for the second time in step S21, but the electric controller 2nd concave flag "H" is set to a predetermined number of times, and the device is stopped at this time. It can also be stopped. Further, steps Sl, S2. S1
6. S17. S22, S2g, 324. It is also possible to repeat the process in step 51 so as not to stop the device. Further, in the process of step 512, if two or more weighing machines are selected and the electric control flag is set to "H", zero point adjustment can be performed for a plurality of weighing machines.

FIG. 4 is a flowchart illustrating the processing procedure of another embodiment of the present invention. Next, this flowchart will be explained.

(1) Check the presence or absence of a timing signal from the packaging machine, and if there is a timing signal (step Pz),
Input and memorize the weights of all the weighing machines in sequence (Step P2) Next, perform a combination calculation on the weighing machines whose electric control flag is "L", and check whether the weight is greater than or equal to the target weight, less than the upper limit weight, and equal to the target weight. A set of close discharge combinations is found (step P3).

(2) Check whether the discharge combination has been obtained (step P4); if the discharge combination has not been obtained, perform processing such as additional supply; if the discharge combination has been obtained, check the measurement selected for the discharge combination Outputs an open command signal to the weighing hopper drive unit of the machine (Step P5).Next, the supply flag is set to "H" according to the discharge combination (Step S6).Subsequently, all wood tone count memory values ＋
Step P7) Checks whether there is a weighing machine whose electric control flag is rHJ (Step P8) Do the following.

(4) On step 1, if there is a weighing machine whose electrical flag is rHJ, find the zero point change (deviation amount) of the weighing machine whose electrical flag is "H" (step Pr5), and find out the amount of change. Check whether the amount of change is within the second predetermined weight ff1ffi set in advance (step P I?) *If the amount of change is within the second predetermined weight, check whether the amount of change is within the first predetermined weight (step FIB)+1 Here, second predetermined weight>first predetermined weight. The amount of change is the first
If the weight is within the predetermined weight, the zero point adjustment is performed on the weighing machine whose electric control flag is rHJ (step P19), and the electric control flag is rHJ.
Set the supply flag of the HJ weighing machine to "H" (step P
20) 11 Next, this power control flag is set to rLJ (step P21), and the process moves to step P9.

(5) In the process of step P1B, when the amount of change is not within the first predetermined weight, that is.

When the second predetermined weight > the amount of change > the first predetermined weight, an open command signal is output to the weighing hopper drive part of the weighing machine with the electrical control flag rHJ to open and close the gate of the weighing hopper, and vibration due to opening and closing. (Accordingly, the object that is caught or attached to the weighing hopper must be removed to eliminate the cause of the zero point abnormality. Step P22), and the electrical control flag is set to rH.
Set the supply flag corresponding to J to rLJ (step P2
5) Next, the wood tone count memory whose electric tone flag corresponds to "dan" is cleared to zero (step P24), and the process of step Ptt is performed.

(6) In the process of step P17, if the amount of change is not within the second predetermined weight, an alarm is displayed (step Pzs) and the apparatus is stopped.

Now, if the measurement count memory is set to, for example, "4", in this embodiment, processing is performed in the following order.

(1) Repeat the process of step P1''Pt1 three times.

(2) In the fourth processing, after the processing of steps P1 to P9, steps P12 to P15*Pl 1 are performed.

(3) In the fifth processing, steps P1 to P day rP16
After performing the process of 1P17 and checking the conditions of step PIT, (a) An alarm is displayed in step P25.

(b) Due to the condition check in step PlB, the process moves from (a) steps P□9 to P21 to step P9.

(b) Step P from steps P22 to P24.

1, the processing of steps P, NP day, and PI37PI day is performed, and the processing of steps P19 to P21 + P9 or the processing of step P22'''P24t Pt 1 is repeated by checking the conditions of step P1B again.

In the second embodiment, if the process of step P24 is executed a predetermined number of times in a row, it is assumed that the cause has not been eliminated and the apparatus can be stopped. Furthermore, in the process of step P12, if two or more weighing machines are selected and the electrical control flag is set to rHJ, zero point adjustment can be performed on a plurality of weighing machines.

Above is the first part. The second embodiment explained how to eliminate the cause of zero point abnormality in a combination weighing device.

The same can be applied to a combination counting device. In this case, in the block diagram of Fig. 1, there is a unit weight setting section for setting the weight per unit number (unit weight), a target number setting section for setting the target number, and an upper @ number for setting the upper limit number. A setting section is provided, and an area is also set in the memory to store these setting values.The weight of the items weighed by each weighing machine is divided by the unit weight, converted to the number of items, and then combined according to the combination pattern. The number of pieces is determined, and a combination that is equal to or close to the target number is selected as a discharge combination from combinations of, for example, the target number or more and the upper limit number or less, and the target weight or more and the upper limit weight or less. Other processes are performed in the same manner as in the case of the combination weighing device, so explanations using flowcharts will be omitted.

(Effect of the invention) As described above, according to the present invention, the cause of zero point abnormality is automatically eliminated by the opening operation of the weighing hopper.
Operational effectiveness of combination weighing device or combination counting device
A decrease in the i rate can be prevented.

[Brief explanation of the drawing]

□ Figure 1 is a schematic block diagram of the combination weighing device,
'□Figure 2 is a diagram explaining the cause of zero point abnormality, Figures 3 and 4 are flowcharts. A...Weighing machine, B...Multiplexer, C...A
/D converter, D... arithmetic control section, E... memory, F
... Upper limit weight setting section, G... Target weight setting section, H.
...Wrapping machine. Patent applicant: Ishida Kouki Seisakusho Co., Ltd. Agent: Minoru Tsuji, patent attorney Figure 1 Figure 2

Claims (2)

[Claims] (1) Weigh the items using multiple weighing machines, calculate the weights obtained from each weighing machine using a combination pattern, and select a combination that satisfies predetermined conditions for the target weight as the discharge combination. Then, use a combination weighing device that discharges the articles from the applicable weighing machine, or divide each weight by the weight (unit weight) of each article and convert it to the number of pieces to find the number of articles for each weighing machine, In the zero-point abnormality elimination method for a combination counting device, in which each number is calculated in combination according to a combination pattern, a combination that satisfies a predetermined condition for the target number of pieces is selected as a discharge combination, and the article is discharged from the corresponding weighing machine, the above-mentioned When performing zero point adjustment for at least one of the weighing machines selected for the discharge combination, if there is a zero point abnormality in which the zero point deviates by more than a predetermined weight, the supply of goods to the weighing machine will be stopped. 1. A method for eliminating a zero point abnormality in a combination weighing device or a combination counting device, characterized in that the cause of the zero point abnormality is eliminated by using a means for opening a weighing hopper. (2) After the opening operation of the weighing hopper, the zero point deviation is checked again, and if the zero point deviation is within a predetermined weight, the zero point adjustment is performed on the weighing machine, and then the article is supplied. A method for eliminating a zero point abnormality in a combination measuring device or a combination counting device according to claim (1).