JP2003156383A - Combinational weighing installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combinational weighing installation which excludes defectives from a treatment passage for conditioned-weight articles, without hindering speeding up or lowering the operation rate, when detectives other than objects of combination computation are produced. SOLUTION: If weighing hoppers, which hold defectives exist in one combination section, in a combination weighing installation provided with two combination sections, combination computation is performed concerning the remaining weighing hoppers, excluding the weighing hoppers. When an optimum combination is selected with only the other combination section, conditioned-weight articles are discharged from weighing hoppers which correspond to the optimum combination, and the conditioned-weight articles are discharged to a collection chute, by collecting conveyors which correspond to these weighing hoppers. Along with it, defectives are made to be ejected from the weighing hoppers too, and the defectives are discharged into a detective recovery box with collecting conveyors which correspond to these weighing hoppers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combination weighing device for weighing articles to a predetermined target weight and belongs to the technical field of article weighing.

[0002]

2. Description of the Related Art Among weighing devices used for a wide range of purposes, combination weighing used when a plurality of articles such as agricultural products and marine products whose individual weights are not constant are combined into a product having a predetermined target weight. The device disperses and supplies the articles to each of the weighing hoppers, weighs the weights, and performs a combination operation based on the measured values, so that the combined weights match the target weights or the target weights within a predetermined allowable range. By selecting the optimum combination that has the closest weight to, and discharging the articles from only the weighing hoppers that correspond to this optimum combination, it is possible to obtain an article with a weight that matches or is closest to the target weight (referred to as a direct quantity product). It is the one.

In such a combination weighing device, the weighing hopper performs a combination calculation such as an article supplied with a weight equal to or more than a target weight or an article whose weighing value is inaccurate because a load detector connected to the weighing hopper has a zero point defect. When a non-target article (referred to as a defective article) is held, it is necessary to exclude this defective article from the processing path of the regular quantity article. An example of a combination weighing device that enables this is Japanese Patent Laid-Open No. 6-1379.
Some are disclosed in Japanese Patent No. 27.

As shown in FIG. 10, in this apparatus, a pair of upper and lower pool hoppers B ... B and weighing hoppers C ... C are arranged in a main body case A. And the weighing hopper C ...
Below C, there is arranged a collecting conveyor D that can drive the articles discharged from these weighing hoppers C ... C and carry them out of the main body case A, and also the pool hoppers B ... B. In the upper main body case A, an input port A '... For inputting articles into these pool hoppers B ... B.
A'is provided. Further, a defective product collection box E and a correct quantity product storage box F are installed on the left and right sides of the drawing, respectively.

As a result, when the articles are supplied to the weighing hoppers C ... C through the pool hoppers B ... B, the weight of each article is weighed. Next, a combination calculation is performed based on this measured value, and the articles are discharged from the weighing hoppers C ... In that case,
The collecting conveyor D is driven in the normal direction, and the discharged regular quantity products are collected and stored in the regular quantity storage box F.

Further, when a defective product is discharged from the weighing hoppers C ... C which hold a product that is not a target of the combination calculation, that is, a defective product, in that case, the collective conveyor D is driven in the reverse direction to discharge the discharged product. The good products are collected in the defective product collection box E.

By repeating such operations, a predetermined combination weighing is performed. In that case, if there are weighing hoppers C ... C that retain defective products, the number of weighing hoppers C .. Although there is a concern that the accuracy of the weight will decrease, this device discharges the defective product from the weighing hoppers C ... C holding the defective product and drives the collective conveyor D in reverse to drive the defective product into the defective product. Since the number of the weighing hoppers C ... C that are collected in the collection box E and that participate in the combination calculation can be recovered, the above-mentioned concern is eliminated.

[0008]

However, even in such a combination weighing device, the following problems may still occur.

That is, when a defective product is generated, in order to remove the defective product from the processing path of the correct quantity product, the goods are processed from the supply of the goods to the weighing hoppers C ... A defective product discharging step, that is, a reverse rotation driving step of the collective conveyor D must be provided in the cycle, which becomes a factor that hinders the speedup in combination weighing and reduces the operating rate.

In view of the above situation, therefore, in the present invention, when a defective product that is not a target of combination operation occurs, the defective product is processed from the processing route of the regular quantity product without obstructing the speedup or lowering the operation rate. An object of the present invention is to provide a combination weighing device capable of eliminating the above.

[0011]

In order to solve the above problems, the present invention is characterized by having the following configuration.

First, the invention according to claim 1 is to collect a plurality of weighing hoppers for weighing the weight of the articles, and to collect the articles of the weighing hoppers selected by the combination calculation based on the weighing values by these weighing hoppers. The present invention relates to a combination weighing device having a plurality of the collecting conveyors for each of a plurality of weighing hoppers, wherein a specific weighing hopper corresponding to one of the collecting conveyors is not a target of combination calculation. When holding articles, when only the weighing hoppers corresponding to the collecting conveyors different from the collecting conveyors are selected by the combination calculation, the articles are discharged from these weighing hoppers and correspond to the above-mentioned collecting conveyor 1. A discharging means for discharging articles from a specific weighing hopper and one collecting conveyor by another collecting conveyor. Wherein the is provided with a drive control means for driving and controlling in a direction different from the goods collection direction.

According to the present invention, when a specific weighing hopper corresponding to one of the collective conveyors holds an article that is not a target for combination calculation, that is, a defective product, a collective conveyor different from the collective conveyor. When only the weighing hoppers corresponding to the above are selected by the combination calculation, the articles, that is, the proper quantity articles are discharged from these weighing hoppers, and the defective articles are also discharged from the specific weighing hopper corresponding to the one set conveyor. Unlike the conventional case, a step for discharging only defective products from the weighing hopper is not provided in the article processing cycle. Therefore, even if a defective product is generated, it is possible to eliminate the defective product from the processing path of the correct quantity product during the normal combination weighing operation, which hinders the speedup in the combination weighing and the operation. It does not reduce the rate.

Next, the invention according to claim 2 is a set for gathering a plurality of weighing hoppers for weighing the weight of the articles and the weighing hoppers selected by the combination calculation based on the weighing values by these weighing hoppers. The present invention relates to a combination weighing device having a conveyor and a plurality of the collective conveyors provided for each of a plurality of weighing hoppers, and a specific weighing hopper corresponding to one of the collective conveyors is not a combination calculation target. If you are holding
Calculation instruction means for instructing to perform a combination calculation only for weighing hoppers corresponding to a collective conveyor different from the collective conveyor, and these weighing hoppers when the weighing hoppers corresponding to the different collective conveyor are selected by the combination calculation. Discharging means for discharging the articles from the specific weighing hopper corresponding to the one collecting conveyor, and driving for controlling the driving of the one collecting conveyor in a direction different from the direction of collecting the articles by the other collecting conveyor. And a control means.

According to the present invention, similarly to the invention described in claim 1, since there is no step for discharging only defective products from the weighing hopper in the article processing cycle, the speed of combination weighing is increased. It does not interfere with or reduce the operating rate. Moreover, since the defective product is not held in the weighing hopper for a long period of time, there is an advantage that the number of weighing hoppers that can participate in the combination calculation is quickly recovered and the defective product is promptly collected.

Further, the invention as set forth in claim 3 is a collective conveyor for collecting a plurality of weighing hoppers for weighing the weight of the articles and the weighing hoppers selected by the combination calculation based on the weighing values by these weighing hoppers. And a timing hopper that stores the articles supplied from the collecting conveyor, and relates to a combination weighing device in which the collecting conveyor is provided for each of a plurality of weighing hoppers, and the collecting conveyor and the timing hopper. A sorting device for sorting the transfer direction of the articles is provided between
When a specific weighing hopper corresponding to one of the collecting conveyors holds an article that is not the target of the combination calculation, the articles that are not the processing target of the combination supplied through the collecting conveyor are It is characterized in that drive control means for driving and controlling the sorting device is provided so as to sort in a direction different from the timing hopper direction.

In the combination weighing device according to claim 1 or 2, when further increasing the speed, a regular time difference is provided from the upstream side to the downstream side of the collecting conveyor to sequentially discharge the regular quantity from the weighing hopper. It is possible. With such a method, when a defective product is generated, both the correct quantity product and the defective product may be placed on one collecting conveyor.
In order to eliminate defective products from the processing route for the normal quantity products, it is not possible to drive one set conveyor in a direction different from the product set direction by the other set conveyors, as in the invention described in (1).

Even in such a case, according to the present invention,
Since the sorting device is provided on the downstream side of the collecting conveyor, it is possible to surely sort the normal quantity product and the defective product supplied in the article collecting direction by the collecting conveyor by the sorting device. Therefore, if a defective product is generated while performing the normal combination weighing operation, it is possible to remove this defective product from the processing path of the proper amount product while the corresponding collecting conveyor is driven in the product collecting direction. Therefore, it is possible to further speed up the combination weighing.

For example, in the case where the packaging machine is arranged further downstream of the timing hopper, in order to avoid holding the positive quantity product for two charges of packaging in the timing hopper, the later-made positive quantity product is used. There is also another merit that the sorting device can be driven so as not to guide the signal to the timing hopper.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] A combination weighing device according to a first embodiment of the present invention will be described below, which reflects the invention according to claim 1 of the present invention.

<Overall Structure> As shown in FIG. 1, this combination weighing device 1 has four pairs of upper and lower pool hoppers 3 ... 3 for each of the combination sections W provided on the left and right of the front surface of the base 2. And the weighing hoppers 4 and 4, and the collective conveyors 5 and 5 that are directly below the weighing hoppers 4 and 4 and can be driven in the forward and reverse directions. Also, each pool hopper 3 ... 3
Immediately above the pool, the articles X ... X are loaded with these pool hoppers 3 ...
The troughs 6 ...

Immediately below between the opposite ends of the collecting conveyors 5 and 5, the articles X ... X that are collected by the collecting conveyors 5 and 5, that is, the genuine products X1 to X1 are further downstream. The collecting chute 7 for guiding is provided below the end opposite to the opposing end, and defective product collection boxes 8 and 8 for collecting the defective products X2 ... X2 are provided. ing.

With such a structure, the article X
.. X is dispersedly supplied to the pool hoppers 3 ... 3 via the troughs 6 ... 6, and further discharged from the pool hoppers 3 ... 3 to the weighing hoppers 4 ... 4. And these weighing hoppers 4 ...
.. X in 4 are respectively weighed, a combination operation is performed based on the measured values, and an optimum combination that matches the preset target weight or is closest within the allowable range is selected and The articles X ... X are discharged as the proper quantity products X1 ... X1 only from the corresponding weighing hoppers 4 ... 4,
It is collected by the collecting conveyors 5 and 5 driven in the direction indicated by the arrow a and discharged to the collecting chute 7.

On the other hand, defective products X2 ...
When X2 is discharged, it is collected by the collecting conveyors 5 and 5 which are driven in the direction indicated by the arrow b, and the defective product collection box 8,
8 is discharged.

<Control System> As shown in FIG. 2, the combination weighing device 1 is provided with a control device 9 for generally controlling the operation of the device 1.

The control device 9 controls the control signals for controlling the discharge of the articles X ... X from the pool hoppers 3 ... 3 and the weighing hoppers 4 ... 4 and the driving speeds and driving directions of the collecting conveyors 5, 5. And output control signals.

Further, the control device 9 controls the respective weighing hoppers 4 ... 4
Input the weighing signal obtained by the load detector (not shown) in, and perform the combination calculation based on this weighing signal, and select the optimum combination that matches the target weight or is the closest weight within the allowable range. .

<Example of Control Operation> An example of control operation executed by the control device 9 when the combination weighing device 1 performs combination weighing will be described with reference to the flowchart shown in FIG.

When the combination weighing is started, first, in step S1, the weighing hoppers 4 ... Which hold the defective products X2 ... X2.
4 is determined, and if NO is determined, in step S2, a combination calculation is performed on all the weighing hoppers 4 ... 4, and then in step S3, the weighing hoppers 4 ... 4 corresponding to the optimum combination are performed. From article X ... X, that is, the original quantity X1 ... X
1 is discharged, and these proper quantity products X1 ... X1 are collected by the collecting conveyors 5 and 5 and discharged to the collecting chute 7.

Although not shown in the flow chart,
In this combination weighing device 1, when the optimum combination is not selected in the combination calculation, the pool hoppers 3 ... 3 to the articles X ... are transferred to the predetermined weighing hoppers 4 ... 4 under predetermined conditions.
After additionally supplying X, the combination operation is performed again. As described above, when an article X is loaded into a certain weighing hopper 4 in an amount more than the target weight, the article X is referred to as a defective article X2. This is caused by the above-mentioned measures being repeated. including.

On the other hand, if YES is determined in the step S1, the characteristic control of the present invention is executed. That is, in step S4, the weighing hopper 4 holding the defective products X2 ... X2.
It is determined whether or not 4 belongs to only one of the combination sections W, and if YES is determined, step S5
Then, the remaining weighing hoppers 4 excluding the weighing hoppers 4 ...
The combinational operation is performed for 4.

Next, in step S6, it is determined whether or not the optimum combination is selected only in the combination section W to which the weighing hoppers 4 ... 4 do not belong, and if YES is determined,
In step S7, the weighing hoppers 4 ...
Eject X1 ...
X1 ... X1 are collected by the collecting conveyor 5 and discharged to the collecting chute 7, and defective products X2 ... X2 are also discharged from the weighing hoppers 4 ... 4, and these defective products X2.
X2 is collected by the collecting conveyor 5 and discharged to the defective product collection box 8.

In FIG. 1, since one weighing hopper 4 indicated by reference numeral A belonging to the combination section W on the left side of the drawing holds the defective product X2, the remaining weighing hoppers excluding this weighing hopper 4 are shown. 4 shows an example in which the optimum combination is selected only in the combination section W on the right side as a result of performing the combination calculation on 4. In this case, the articles X ... X are discharged from the three weighing hoppers 4 ... 4 corresponding to the optimum combination as the regular quantity X1 ... X1, and are conveyed while being conveyed in the direction indicated by the arrow a by the collecting conveyor 5 on the right side. In addition to being discharged to the collecting chute 7, the defective product X2 is also discharged from the one weighing hopper 4 and is conveyed in the direction indicated by the arrow b by the collecting conveyor 5 on the left side to collect the defective product on the left side. Will be collected.

If NO is determined in step S6,
This means that the weighing hoppers 4 ... 4 corresponding to the optimum combination are present over both the combination sections W, W, and in that case, in step S8, the weighing hoppers 4 ... X1 ... X1 is discharged, while defective products X2 ... X2 are held in the weighing hoppers 4 ...

If NO in step S4, it means that the weighing hopper 4 holds the defective products X2 ... X2.
4 means that both of the combination sections W, W exist, in that case, in step S9, defective products X2 ... X2 are discharged from the weighing hoppers 4 ... 4,
These defective products X2 ... X2 are collected by the collecting conveyors 5, 5 and discharged into the defective product collecting boxes 8, 8.

Then, in each of the steps S3, S7 to S9.
After executing, the process returns to step S1 in any case.

By doing so, the weighing hoppers 4 ... 4 holding the defective products X2 ...
X1, when the optimum combination is selected only in the other combination section W, the positive quantity products X1 ... X1 are discharged and the defective products X2 ... X2 are discharged. There is no step to eject only X2. Therefore, it does not hinder the speedup of combination weighing or reduce the operating rate, and
It becomes possible to exclude defective products X2 ... X2 from the processing path of X1.

In this case, among all the weighing hoppers 4 ... 4, only the weighing hoppers 4 ... 4 holding the defective products X2 ... X2 are not allowed to participate in the combination calculation, so that the combination is selected within the allowable range. It does not unnecessarily reduce the accuracy of the probability or combination weight.

In the step S8, the positive quantity product X1
X1 is discharged, while defective products X2 ... X2 are controlled to be held in the weighing hoppers 4 ... 4, but if it is desired to give priority to discharging defective products X2. .. X1 may be held in the weighing hoppers 4 ... 4 while the defective products X2 ... X2 may be discharged.

[Second Embodiment] In the combination weighing device 1 according to the first embodiment, control reflecting the invention according to claim 2 of the present invention is possible. A second embodiment will be described.

<Example of Control Operation> Another example of control operation executed by the control device 9 when the combination weighing device 1 performs combination weighing will be described with reference to the flowchart shown in FIG.

When the combination weighing is started, first, in step S11, the weighing hopper 4 for holding the defective products X2 ... X2.
4 is determined, and if NO is determined, in step S12, all the weighing hoppers 4 ... 4 are subjected to combination calculation, and in step S13, the weighing hoppers 4 ... 4 to the article X ... X, that is, the regular quantity X
1 ... X1 are discharged, and these correct quantity products X1 ... X1 are collected by the collecting conveyors 5, 5 and discharged to the collecting chute 7.

As in the first embodiment, when the optimum combination is not selected in the combination calculation, the pool hoppers 3 ... 3 are transferred to the predetermined weighing hoppers 4 ... 4 under predetermined conditions. The items X ... X are additionally supplied, and then the combination calculation is performed again.

On the other hand, if YES is determined in the step S11, the characteristic control of the present invention is executed. That is, in step S14, it is determined whether or not the weighing hoppers 4 ... 4 holding the defective products X2 ... X2 belong to only one of the combination sections W.

If YES is determined in step S14, in step S15, a combination operation is performed on the combination section W to which the weighing hoppers 4 ...
In step S16, the weighing hoppers 4 corresponding to the optimum combination
.. X1 are discharged from the mass storage hoppers 4 and the masses X1 ... X1 are collected by the collecting conveyor 5 and discharged to the collecting chute 7. The defective hoppers X2 ... X2 are also discharged from the weighing hoppers 4. Are discharged and these defective products X2
... X2 is collected by the collecting conveyor 5 and discharged to the defective product collection box 8.

If NO in step S14, it means that the weighing hopper 4 holds the defective products X2 ... X2.
4 means that both combination sections W and W exist respectively, and in that case, in step S17,
Defective products X2 ... X2 are discharged from the weighing hoppers 4 ... 4 and these defective products X2 ...
Are collected and discharged into each defective product collection box 8, 8.

Then, in each of the steps S13, S16,
After executing S17, in either case, step S1
Return to 1.

By doing so, the weighing hoppers 4 ... 4 holding the defective products X2 ...
In the case of belonging to, the combination calculation is performed only for the other combination section W, and the correct quantity products X1 ... X1 are discharged from the weighing hoppers 4 ... 4 corresponding to the optimum combination, and the defective products X2 ... X2 are discharged. Defective product X
No step for discharging only 2 ... X2 is provided. Therefore, the defective products X2 ... X2 can be excluded from the processing path of the proper quantity products X1 ... X1 without inhibiting the speeding up of the combination weighing or reducing the operating rate. Moreover, the weighing hopper 4 that can participate in the combination calculation
4 has a merit that the number of defective products X2 ... X2 is promptly recovered and the number of 4 is promptly recovered.

In this case, of all the weighing hoppers 4 ... 4, the weighing hoppers 4 ... 4 on the side of the combination section W to which the weighing hoppers 4 ... 4 holding the defective products X2 ... X2 belong do not participate in the combination calculation. Therefore, the probability of selecting a combination may decrease.

On the other hand, as shown in FIG. 5, for example, step S14 'is provided between step S14 and step S15, and in step S14', the allowable range for the target weight is expanded (for example, the target Weight 40
Normally 0 to + 20g for 0g is +0 to +5
0 g), and then in step S15, a combination operation may be performed. By doing so, it is possible to prevent the probability of combination selection from being unnecessarily reduced.

[Third Embodiment] Next, a combination weighing device according to a third embodiment of the invention, which reflects the invention described in claim 3 of the present invention, will be described. For convenience, the first
Constituent elements common to the combination weighing device 1 according to the embodiment of the present invention will be denoted by the same reference numerals unless otherwise confusing.

<Overall Structure> As shown in FIG. 6, this combination weighing device 11 is arranged on the upstream side of the packaging machine P, and for each combination section W, W provided on the left and right of the front surface of the base 2. 4 and a pair of upper and lower pool hoppers 3 ... 3 and weighing hoppers 4 ... 4 and collecting conveyors 5 and 5 immediately below the weighing hoppers 4 ... 4 are arranged. Further, troughs 6 ... 6 for supplying the articles X ... X to the pool hoppers 3 ... 3 are provided immediately above the pool hoppers 3 ... 3, respectively.

Directly below the opposite ends of the collecting conveyors 5 and 5, the transfer directions of the articles X ... X (X1 ... X1, X2 ... X2) collected by these collecting conveyors 5, 5 are conveyed. A distribution hopper 12 for allocating the products is disposed below the distribution hopper 12, and a timing hopper immediately above the packaging machine P for storing the correct quantity products X1 ... X1 distributed by the distribution hopper 12. 13 and sorting hopper 12
A defective product collection box 8 for collecting the defective products X2 ... X2 sorted by is disposed.

The sorting hopper 12 is provided with a double-opening gate type article discharging mechanism, and is configured so as to sort and discharge the article X in two directions. In the illustrated example, one gate is used. Items X ... X (X1 ... X1, X2) are opened on the side of the timing hopper 13 as shown by a solid line, and opened on the side of the defective product collection box 8 as shown by a chain line when the other gate is opened.
... X2) is discharged. The gate is normally opened so as to guide the correct quantity product X1 to the timing hopper 13.

With such a structure, the article X
.. X is dispersedly supplied to the pool hoppers 3 ... 3 via the troughs 6 ... 6, and further discharged from the pool hoppers 3 ... 3 to the weighing hoppers 4 ... 4. And these weighing hoppers 4 ...
.. X in 4 are respectively weighed, a combination operation is performed based on the measured values, and an optimum combination that matches the preset target weight or is closest within the allowable range is selected and The articles X ... X are discharged as the proper quantity products X1 ... X1 only from the corresponding weighing hoppers 4 ... 4,
The sheets are gathered by the gathering conveyors 5 and 5 driven in the direction indicated by the arrow a, and further discharged to the timing hopper 13 via the sorting hopper 12. The regular quantity products X1 ... X1 discharged to the timing hopper 13 are supplied to the packaging machine P to be packaged products.

On the other hand, from the weighing hopper 4 ... 4 to the defective product X2 ...
When X2 is discharged, it is collected by the collecting conveyors 5 and 5 which are also driven in the direction indicated by the arrow a, further sorted by the sorting hopper 12, and discharged to the defective product collection box 8.

<Control System> As shown in FIG. 7, the combination weighing device 11 is provided with a control device 9 for generally controlling the operation of the device 11.

The control device 9 includes pool hoppers 3 ...
4, a control signal for controlling the discharge of the articles X ... X from the weighing hoppers 4, 4, the sorting hopper 12, and the timing hopper 13, and a control signal for controlling the driving speed and the driving direction of the collective conveyors 5, 5 are output. To do.

Further, the control unit 9 controls the respective weighing hoppers 4 ... 4
Input the weighing signal obtained by the load detector (not shown) in, and perform the combination calculation based on this weighing signal, and select the optimum combination that matches the target weight or is the closest weight within the allowable range. .

Then, the control device 9 sends and receives a signal to and from the packaging machine P, inputs a discharge request signal from the packaging machine P, and outputs a discharge completion signal to the packaging machine P.

<Example of Control Operation> An example of control operation executed by the control device 9 when the combination weighing device 11 performs combination weighing will be described with reference to the flowcharts shown in FIGS. 8 and 9.

When the combination weighing is started, the control for monitoring the distribution request shown in FIG. 8 is executed. That is, in step S21, after waiting for the allocation operation request, step S2
If the sorting operation timer is timed out in 2, the opening / closing of the gate of the sorting hopper 12 is controlled so that the articles X ... X are sorted in the direction of the defective article collection box 8 in step S23.

On the other hand, the combination weighing device 11 and the packaging machine P
When and are linked, the control shown in FIG. 9 is executed. That is, in step S31, after waiting for the discharge request signal from the packaging machine P, in step S32.
The gates of the timing hoppers 13 that hold the correct quantity products X1 ... X1 to be discharged this time are opened and closed to obtain these correct quantity products X1.
... X1 is discharged to the packaging machine P and a discharge completion signal is output.

Next, in step S33, the articles X ... X scheduled to be supplied to the timing hopper 13 next time, that is, the articles X ... X near the timing hopper 13, are the original articles X1.
It is determined whether it is X1.

If YES is determined in the step S33,
The sorting hopper 12 carries out the sorting operation, and these correct quantity products X
Since 1 ... X1 must not be distributed in the direction of the defective product collection box 8, the distribution operation request is reset in step S34. It should be noted that, as shown by the reference numeral C in FIG. 6, for example, these proper-quantity products X1 ...

On the other hand, if NO at step S33, it means that the articles X ... X near the timing hopper 13 are the same.
Means defective product X2 ... X2. In that case, since the step S34 is skipped, the distribution operation request is not reset, and as described in FIG. 8, if the distribution operation timer times up, that is, the preset operation is set. When a predetermined time has elapsed, the sorting hopper 12 performs a sorting operation, and the defective products X2 ... X2 that have reached the sorting hopper 12 position are sorted in the defective product collection box 8 direction.

Then, in step S35, a combination calculation is performed one after another. In this case, the weighing hoppers 4 ... 4 that previously discharged the articles X ... X are newly supplied with the articles X ... X from the pool hoppers 3 ... 3, and all the weighing hoppers 4 ... 4 receive the articles X ... X. It is in a held state.

Then, in step S36, the defective product X2 ...
It is determined whether or not there is a weighing hopper 4 ... 4 that holds X2, and if YES is determined, these defective products X2 ...
Since it is necessary to distribute 2 to the defective product collection box 8 direction,
In step S37, the distribution operation request is set and the distribution operation timer is set. By doing so, these defective products X2 ... X2 are subject to the control shown in FIG. On the other hand, if NO is determined, the step S37 is skipped.

Then, in step S38, the weighing hopper 4
After ejecting the article X ... X from step 4, step S31
Return to. When YES is determined in step S36, the articles X ... X mean defective articles X2 ... X2, and when NO is determined, the original articles X1 ... X1.
Will be meant.

In this way, when the discharge request signals are sequentially output with a predetermined time difference, the timing hopper 13 discharges the correct quantity products X1 ... X1 and the collecting conveyor 5,
Supply of the correct quantity products X1 ... X1 to the timing hopper 13 by 5, the discharge of the correct quantity products X1 ... X1 from the weighing hoppers 4 ... 4 to the collecting conveyors 5,5, and the pool hoppers 3 ... 3 to the weighing hoppers 4 ... 4. The articles X ... X are sequentially and efficiently supplied to the articles.

The weighing hoppers 4 ... 4 are defective products X2 ...
When X2 is held, the distribution operation request is set,
After the lapse of a predetermined time, the sorting hopper 12 causes the defective product X2 ...
It operates to sort X2 in the direction of the defective product collection box 8. Therefore, the defective product X
When X2 ... X2 occurs, the defective products X2 ... X2 can be surely excluded from the processing path of the proper quantity products X1 ... X1, so that the combination weighing can be further speeded up.

Further, the combination weighing device 11 and the packaging machine P
When X and X are well interlocked with each other, the timing hopper 1 is responsive to the discharge request signal from the packaging machine P before the next regular quantity X1 ... X1 of the package arrives at the position of the sorting hopper 12.
Since the gate of No. 3 is opened and the regular quantity X1 ... X1 of the package for this time is discharged to the packaging machine P side, the regular quantity X1 ... X1 of the package 2 charges is not supplied to the timing hopper 13. .

However, for example, if the packaging machine P is stopped for some reason, the timing hopper 13 may be in a state of holding the regular quantity X1 ... X1 of the current packaging. On the other hand, since the normal collecting conveyors 5 and 5 are continuously driven, the next-packed proper-quantity products X1 ... X1 are discharged to the timing hopper 13 through the collecting conveyors 5 and 5, and as a result, the timing hopper 13 is packed into the packaging 2. There is a possibility that the positive-quantity products X1 ... X1 for the charge will be held.

Even in such a case, if the sorting hopper 12 performs the sorting operation when a predetermined time has elapsed after the discharge request signal for the previous packaging was output, the sorting of the next packaging can be performed. The correct quantity products X1 ... X1 are now sorted in the direction of the defective product collection box 8, and the timing hopper 13 causes the correct quantity product X1 for two charges of the current and next packaging.
... holding X1 is avoided. Therefore, the normal operation of the packaging machine P is maintained.

The combination weighing device 11 according to the present embodiment has the weighing hoppers 4 ... 4, which are arranged in rows, and the left and right collective conveyors 5, 5 downstream of these weighing hoppers 4.
5, the present invention is also applicable to a combination weighing device having circularly arranged weighing hoppers and long collecting chutes replacing the collecting conveyors 5 and 5 on the downstream side of these measuring hoppers. It is possible.

Further, in this embodiment, the distribution hopper 1
Although the hopper type sorting device as described in No. 2 is used, the present invention is not limited to this and may be, for example, a chute type.

[Other Embodiments] It should be noted that, between the weighing hoppers 4 ... 4 and the collecting conveyors 5, 5 in the first to third embodiments, positions corresponding to the respective weighing hoppers 4 ... 4 are further provided. Each booster hopper can be installed. By doing so, not only the combination calculation of the weights of the articles X ... X alone held in the booster hopper but also the weights of the articles X ... X in the pair of upper and lower booster hoppers and the articles X ... In the weighing hoppers 4 ... 4 are carried out. Since the combination calculation based on the total weight of the weight of X and the weight can be performed, it is possible to select the optimum combination in which the combination weight value is closer to the target weight.

Further, in the first to third embodiments,
Although the gate-type pool hoppers 3 ... 3 and the weighing hoppers 4 ... 4 are used, the present invention is not limited to this and, for example, those equipped with an up-down reversing type article discharging mechanism can be used.

Further, in the first to third embodiments,
The combination sections W and W are provided on the left and right, but they may be further expanded.

[0080]

As described above, according to the present invention,
Provided is a combination weighing device capable of excluding a defective product from the processing path of a correct amount product when the defective product out of the combination calculation target occurs, without impeding speeding up or lowering the operation rate. The present invention is widely applicable to the technical field of article weighing.

[Brief description of drawings]

FIG. 1 is a schematic side view of a combination weighing device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of the control system of the same.

FIG. 3 is a flowchart similarly showing an example of control operation.

FIG. 4 is a flowchart showing a control operation example according to the second embodiment of the present invention.

FIG. 5 is a flowchart of the same.

FIG. 6 is a schematic side view of a combination weighing device according to a third embodiment of the present invention.

FIG. 7 is a block diagram of the control system of the same.

FIG. 8 is a flowchart similarly showing an example of control operation.

FIG. 9 is also a flowchart.

FIG. 10 is a partially broken schematic side view of a conventional combination weighing device.

[Explanation of symbols]

1, 11 Combination weighing device 4 Weighing hopper 5 Collective conveyor 9 Control device (discharging means, drive control means, calculation instruction means) 12 Sorting hopper (sorting device) 13 Timing hopper X Article

Claims (3)

[Claims] 1. A plurality of weighing hoppers for weighing the weight of articles, and a collective conveyor for collecting the articles of the weighing hoppers selected by a combination calculation based on the measured values by these weighing hoppers. In the case where a plurality of combination weighing devices are provided for each of a plurality of weighing hoppers, a specific weighing hopper corresponding to one set conveyor among the set conveyors holds an article that is not a combination calculation target, When only the weighing hoppers corresponding to the collecting conveyor different from the collecting conveyor are selected by the combination calculation, the articles are discharged from these weighing hoppers and the articles are also discharged from the specific weighing hopper corresponding to the one collecting conveyor. Ejection means for ejecting and driving control of one collecting conveyor in a direction different from the collecting direction of articles by another collecting conveyor And a drive control means for controlling the combination weighing device. 2. A plurality of weighing hoppers for weighing the weight of articles, and a collective conveyor for collecting the articles of the weighing hoppers selected by a combination calculation based on the measured values by these weighing hoppers, wherein the collective conveyor A combination weighing device provided for each of a plurality of weighing hoppers, wherein a specific weighing hopper corresponding to one of the collecting conveyors holds an article which is not a combination calculation target. , A calculation instructing means for instructing to perform a combination calculation only on weighing hoppers corresponding to a collective conveyor different from the collective conveyor, and when the weighing hoppers corresponding to the different collective conveyor are selected by the combination calculation, these weighings are performed. The articles are discharged from the hopper, and the articles are also discharged from the specific weighing hopper corresponding to the collecting conveyor of the above 1. And a drive control means for driving and controlling one collecting conveyor in a direction different from an article collecting direction of another collecting conveyor. 3. A plurality of weighing hoppers for weighing the weight of articles, a collective conveyor for collecting the articles of the weighing hoppers selected by a combination calculation based on the measured values by these weighing hoppers, and a collective conveyor supplied from the collective conveyors. A combination weighing device having a timing hopper for storing articles, wherein the collective conveyor is provided in plural for each of a plurality of weighing hoppers, and the transfer direction of the articles is distributed between the collective conveyor and the timing hopper. If a sorting device is provided and a specific weighing hopper corresponding to one of the collecting conveyors holds an article which is not a target of combination calculation, the articles are supplied through the collecting conveyor. A drive for driving and controlling the sorting device so as to sort the articles not subject to the combination calculation in a direction different from the direction of the timing hopper. A combination weighing device comprising a control means.