JPH0674814A - Combination weight measuring device - Google Patents

Abstract

PURPOSE:To prevent the generation of weight measuring hopper unable to use in combination and selection in a combination weight measuring device by preventing the excess or lacking of supply to the weight measuring hopper. CONSTITUTION:When the amount of a measured object on a dispersion feeder becomes from normal to lacking (point D), the convey force value P is stored. Then, the amount of the measured object on the dispersion feeder returns from lacking to normal, the stored convey force value P is output to a convey force setting means as the previous convey force value and is feedback controlled based on the stored convey force value P.

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 an object to be weighed such as confectionery and vegetables with a large number of weighing devices and selecting an optimum combination of the objects to be weighed from the weighing result. .

[0002]

2. Description of the Related Art A combination weighing device sets an object to be weighed, such as confectionery, fruits, and vegetables, having different weights, as a target weight (for example, JP-A-63-30725).
(See the official gazette). An example of this type of combination weighing device is shown in FIG.

In FIG. 6, an object M to be weighed carried by a carrying conveyor 1 is supplied to each driving feeder 3 _{1 to} 3 _n via a dispersing feeder 2 and each driving feeder 3 ₁
From each to 3 _n are supplied to the corresponding weighing hoppers 6 ₁ to 6 _n. The combination control means (not shown) combines the respective weighing values (weights of the objects to be weighed) obtained by the _n weighing hoppers 6 _{1 to} 6 _n to obtain the optimum weighing hopper (object to be weighed).
Select the combination of. That is, a combination closest to or equal to the target weight is selected based on the measured values of the weighing hoppers 6 _{1 to} 6 _n . The selected objects to be weighed M are collectively discharged via the collective discharge chute 9.

[0004] In order to perform this combination selection accuracy, also efficiently, the supply amount of the objects to be weighed M for weighing hoppers 6 ₁ to 6 _n is always predetermined weight (e.g., the combination selecting a target weight Value divided by the number of hoppers). Therefore, for each drive feeder 3 _{1 to} 3 _n , its sending force parameter (for example,
The value of the drive feeder amplitude and vibration time) (hereinafter referred to as the “feed force value”) is controlled as follows.

For each drive feeder 3 _{1 to} 3 _n , a sending force parameter setting means (not shown) creates a new sending force value based on the sending force value up to the previous time and the actual supply amount corresponding to the sending force value. To set. The drive feeders 3 _{1 to} 3 _n are driven according to the newly set feed force value, and the objects M to be weighed which are always close to a predetermined amount are delivered to the weighing hoppers 6 _{1 to} 6 _n .

However, the supply amount from the drive feeders 3 _{1 to} 3 _n greatly changes depending on the amount (layer thickness) of the object M to be weighed on the dispersion feeder 2 in addition to the feeding force value. The supply of the objects to be weighed M to the dispersion feeder 2 is performed by the cross feeder or the conveyer 1, but the supply amount is not always stable.

Since the supply of the objects to be weighed M from the cross feeder or the conveyor 1 to the dispersing feeder 2 is not constant, the amount of the objects to be weighed M on the dispersing feeder 2 is
Insufficient state B occurs as shown in FIG. When this shortage state B continues, the supply amount to each of the weighing hoppers 6 _{1 to} 6 _n (FIG. 6) becomes insufficient with respect to a predetermined amount, and therefore the amount of supply shown in FIG. 7B is calculated based on this supply amount. The force value gradually increases as indicated by the broken line, and eventually becomes abnormally large. Therefore, the amount of the object M to be weighed on the dispersion feeder 2 is
Even after returning to the normal state C of FIG. 7 (a), after several times, the weighed hoppers 6 _{1 to} 6 _n of the drive feeders 3 _{1 to} 3 _{n of} FIG. Material M is supplied. Therefore, an abnormally large amount of the object to be weighed M is supplied to the weighing hoppers 6 _{1 to} 6 _n . As a result, there is a problem in that a situation such as generation of a weighing hopper 6 that cannot be used for selection of combinations occurs, resulting in a significant decrease in efficiency.

Therefore, the above-mentioned prior art (Japanese Patent Laid-Open No. 63-3
No. 0725), when the amount of the object to be weighed M on the dispersion feeder 2 is insufficient (deficient state) for more than a predetermined threshold value shown in FIG. When the calculation of the force value is stopped and the normal state is restored from the insufficient state, the transmission force value is calculated again. By controlling in this way, the above-mentioned prior art can control the change in the amount of the object to be weighed on the dispersion feeder 2 (FIG. 6) of FIG.
The sending force value in FIG. 7 (b) is shown by the chain double-dashed line, and by preventing it from becoming abnormally large as shown by the broken line in the insufficient state B, the normal state C in FIG. 7 (a) is obtained. The aim is to reduce the power transmission value after returning.

[0009]

However, in the above-mentioned prior art, in the insufficient state B after the elapse of the predetermined time t, the sending force value is kept constant, that is, the sending force value control is abandoned. Therefore, when the amount of the object M to be weighed on the dispersion feeder 2 (FIG. 6) of FIG. 7 (a) is further reduced than the expected amount, the supply amount to the weighing hopper 6 (FIG. 6) is significantly increased. Run short. Therefore, a combination failure is likely to occur.

The present invention has been made in view of the above-mentioned problems of the prior art. By preventing an excess or deficiency of the supply amount to the weighing hopper, it is possible to prevent a combination failure of the combination weighing device and to use it for selecting a combination. The purpose is to prevent the occurrence of hoppers.

[0011]

In order to achieve the above object, the invention of claim 1 is such that when the amount of the object to be weighed upstream of the drive feeder becomes insufficient from the normal amount, The memory that stores the force value at that time, and when the amount of the object to be weighed upstream of the drive feeder returns from the insufficient amount to the normal amount, the force value based on the above value stored in the memory And a transfer means for outputting the power transmission value to the power transmission parameter setting means. The power feeding parameter setting means sets a new power feeding value of each drive feeder based on the power feeding value up to the previous time and the measured value, and the amount of the object to be measured upstream of the drive feeder is a normal amount. Even when the amount becomes insufficient from the above, the setting of the above-mentioned power feeding value is continued.

According to the first aspect of the present invention, the feed force value when the amount of the object to be weighed upstream of the drive feeder becomes less than the normal amount is stored, and the insufficient amount is changed to the normal amount. Since the feedback control is performed on the basis of the stored feed force value when returning, the supply amount to the weighing hopper does not become excessive even when the normal amount is rapidly returned. On the other hand, the feedback control is performed even when the amount of the object to be weighed on the upstream side is insufficient, so that the amount supplied to the weighing hopper is not likely to be excessively lightweight.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, in a state in which a predetermined condition is satisfied after the amount of the object to be weighed upstream of the drive feeder has returned from the insufficient amount to the normal amount. , Holding means for holding the force value output to the drive feeder.

According to the second aspect of the present invention, since the holding means for holding the feeding force value within a certain range after the normal state is restored, the supply amount to the weighing hopper is rapidly increased. Can be prevented.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment. In FIG. 2, the conveyor 1 drops the object M to be weighed onto the center of a flat conical dispersion feeder 2. Dispersion feeder 2
N driving feeders 3 _{1 to} 3 _n are provided on the periphery of the. Each of the driving feeders 3 _{1 to} 3 _n is driven in accordance with the set feed force value, that is, by vibrating by the set amplitude and time, so that the objects M to be weighed on the dispersion feeder 2 are moved to n pieces. and it sends to the pool hoppers 4 ₁ to 4 _n.
Gates 5 _{1 to} 5 _n are provided in the pool hoppers 4 ₁ to 4 _n , and weighing hoppers 6 _{1 to} 6 _n are provided below the gates 5 _{1 to} 5 _n.
Is provided. Each of the weighing hoppers 6 _{1 to} 6 _n is provided with a hopper weight scale 7 _{1 to} 7 _n and gates 8 ₁ to 8 _n . A large collecting and discharging chute 9 is provided below the gates 8 ₁ to 8 _n .

In FIG. 1, the hopper weight scale 7 _i
Is a load cell, for example, measures the weight of the object M to be weighed in the weighing hopper 6 _i (FIG. 2), and uses the weighted value as the weight signal w _i , the combination control means 10 and the force transmission parameter setting means 20 _i. Output to. In addition, in FIG. 1, it means that there are n elements and signals corresponding to the reference numerals with " _i ".

The combination control means 10 combines the weighing values from the hopper weight scales 7 _{1 to} 7 _n , that is, the weighed objects obtained by the _n weighing hoppers 6 _{1 to} 6 _n in FIG. By combining the weights of the objects, the optimum combination of the weighing hoppers 6 (the optimum combination of the objects to be weighed) is selected as follows. The combination control means 10 of FIG. 1 includes a combination weight calculation unit 11, a target weight setting unit 12, and a combination determination unit 1.
3 and a hopper opening / closing control unit 14. The combination weight calculation unit 11 adds up the combination of m measurement values out of the measurement values from the hopper weight scale 7 _i, and outputs a combination weight signal w _M to the combination determination unit 13. The output of this summing and combination weight signal w _M is done for all combinations. The combination determination unit 13 compares the combination weight signal w _M from the combination weight calculation unit 11 with the target weight from the target weight setting unit 12, and determines, for example, that the weight of the object M to be packaged is the target weight or the target weight. The combination is selected so that the value is closest to
And output to the feeder drive control unit 30 _i . The feeder drive control unit 30 _i drives the drive feeder 3 _i according to the force value to be described later.

The hopper opening / closing control unit 14 opens the gates 8 _i of the selected m weighing hoppers 6 _i in FIG. As a result, the objects M to be weighed are discharged from the weighing hopper 6 _i, collected by the collecting and discharging chute 9 and supplied to the packaging machine 31. Furthermore, the hopper opening and closing control unit 14 (FIG. 1), open the gate 5 _i of the pool hoppers 4 _i corresponding to the weighing hoppers 6 _i emptied, the objects to be weighed to the weighing hopper 6 _i from the pool hoppers 4 _i Supply M. On the other hand, the feeder drive control unit 30 _i of FIG. 1 are provided the n corresponding to the drive feeders 3 _i, the driving feeders 3 _i corresponding to the pool hoppers 4 _i in FIG. 2 emptied,
The object M to be weighed is sent to the pool hopper 4 _i by being driven according to the set feed force value.

Each power transmission parameter setting means 20 shown in FIG.
_i is the new Okuchikara value of the driving feeders 3 _i, and sets on the basis of the metric value of the previous Okuchikara value and the hopper weight measuring device 7 _i, the amount of the articles M on the upstream of the driving feeders 3 _i Even when the amount of water has become insufficient from the normal amount,
The setting of the power transmission value is continued, and each has a parameter calculation unit 21 _i and a previous power transmission value memory 22 _i .
The previous power transmission value memory 22 _i includes the parameter calculation unit 21.
_{The power} transmission value previously calculated by _i is stored, and the power transmission value signal p1 _i from the parameter calculator 21 _i is input via the first switching means 33 _i .

[0020] The parameter calculation unit 21 _i, based on the weight signal w _i from the hopper weight measuring device 7 _i, or the supply amount supplied to the weighing hoppers 6 _i (Fig. 2) is less or greater than a predetermined amount If it is larger than the predetermined amount, the power transmission value from the previous power transmission value memory 22 _{i is} subtracted by one unit, and the subtracted power transmission value is output as the power transmission value signal pl _i . on the other hand,
If, as a result of the above determination, the supply amount to the weighing hopper 6 _i (FIG. 2) is less than the predetermined amount, the parameter calculation unit 21 _i adds one unit to the transmission force value from the previous transmission force value memory 22 _i. Te, and outputs the resulting sum Okuchikara value as Okuchikara value signal pl _i. As a result of the above determination, the parameter calculation unit 21 _i determines that the supply amount to the weighing hopper 6 _i is equal to the predetermined amount.
And it outputs the transmission power value from the previous forwarding force value memory 22 _i directly as Okuchikara value signal pl _i. Although not shown in the figure, the above-mentioned parameter calculation unit 21 _i and the previous transmission force value memory 2
2 _i are provided for both types of amplitude and vibration time.

The dispersion feeder 2 shown in FIG. 2 is provided with a detector 32 composed of, for example, a load cell. This detector 32 detects the weight of the object M to be measured upstream of the drive feeder 3 _i by detecting the weight of the dispersion feeder 2 and the object M to be weighed on the dispersion feeder 2 and outputs the total weight signal wa of FIG. It outputs to the determination means 34.

The discriminating means 34 has a map. First, whether or not the weight of the object M to be weighed on the dispersion feeder 2 (FIG. 2) is larger than a predetermined threshold value, that is, this weight is Determine whether the amount is normal or insufficient. In addition to the above determination, the determination means 34 determines whether or not the weight of the object to be weighed M on the dispersion feeder 2 (FIG. 2) has changed from a normal amount to an insufficient amount, and if it has changed, a pulse is output. The signal c is output to the switching circuit 35 _i , and the switching circuit 3 _i
Close 5 _i for a very short time. On the other hand, when the weight of the object M to be weighed on the dispersion feeder (FIG. 2) returns from a shortage amount to a normal amount, the determination means 34 determines this and outputs the switching signal d to the hold means 36. To do. Hold means 36
Holds this switching signal d for a fixed time t1 and continues to output it to the first switching means 33 _i . This makes the first
Switching means 33 _i switches the terminal f to the terminal g.

The sending force value calculated by the parameter calculating unit 21 _i is set as the sending force value signal p1 _i when the switching circuit 35 _i is closed, and the sending force value memory 3 at the lower limit is used.
8i. That is, the lower limit of the force-feeding value memory 38
_i stores the value of the force to be fed when the amount of the object to be weighed M on the dispersion feeder 2 (FIG. 2) becomes insufficient from the normal amount.

On the other hand, Okuchikarachi stored in Okuchikara value memory 38 _i at the lower limit, when the first switching means 33 _i is Tsu cut conversion is transferred by the transfer means 39 _i, before forwarding force It is stored in the value memory 22 _i . That is, the transfer means 39
_i is the above-mentioned feeding force value stored in the lower limit feeding force value memory 38 _i when the amount of the object M to be weighed on the dispersion feeder 2 (FIG. 2) returns from the insufficient amount to the normal amount. Is output to the previous power transmission value memory 22 _i of the power transmission parameter setting means 20 _i .

Next, the operation of the combination weighing device will be described. First, the operation when the amount of the object M to be weighed on the dispersion feeder 2 in FIG. 2 is a normal amount and is steady will be described. The object M to be weighed is sent from the transfer conveyor 1 onto the dispersion feeder 2, and the drive feeder 3 _i and the pool hopper 4 are further fed.
Through the _i , the weighing hopper 6 _i, and the collecting and discharging chute 9, the objects M to be weighed are collectively packed in the packaging machine 31 into a bag. At this time, the combination control means 10 of FIG. 1 selects the optimum combination of m weighing hoppers 6 _i (FIG. 2) as described above. Subsequently, the combination control means 10 selects a combination by the remaining weighing hoppers 6 _i (FIG. 2), and similarly,
Combination discharge is performed. On the other hand, the hopper opening / closing control unit 14
Opens the gate 5 _i of the pool hoppers 4 _i corresponding to the weighing hoppers 6 _i which previously discharged in Figure 2, the pool hoppers 4 _i
The object M to be weighed is conveyed from the empty to the empty weighing hopper 6 _i . Further, by driving the driving feeders 3 _i corresponding to the discharged pool hoppers 4 _i, the objects to be weighed to the empty pool hoppers 4 _i M
To supply.

[0026] Okuchikarachi at this time, is calculated based on the weight value from the previous transmission power value and the hopper weight measuring device 7 _i from forwarding force value memory 22 _i before the parameter calculating unit 21 _i of FIG. 1 It The calculated feed force value is output to the feeder drive control unit 30 _i as the present feed force value and is output to the previous feed force value memory 22 _i . Further, the above-described operation and calculation of the feeding force value are continued not only in the normal state A of FIG. Therefore, while the amount of the object to be weighed M of the dispersion feeder 2 in FIG. 3A decreases and increases, the feeding force value increases and decreases as shown by the solid line in FIG. 3B.

On the other hand, when the amount of the object M to be weighed on the dispersion feeder 2 is changed from the normal amount to the insufficient amount, that is,
At the point D, the determination means 34 of FIG. 1 determines this, the switching circuit 35 _i is closed, and the power transmission value P at this time is stored in the power transmission value memory 38 _i at the lower limit.

After that, when the shortage state B of FIG. 3A is recovered to the normal state C, that is, when the point E is reached, the discriminating means 34 of FIG. 1 discriminates this and the switching is performed via the holding means 36. The signal d is the first switching means 33 for a fixed time t1.
_It is output to _i and the first switching means 33 _i switches to the g terminal. Thus, the aforementioned Okuchikara value P stored in Okuchikara value memory 38 _i at the lower limit is stored is transferred before forwarding force value memory 22 _i by the transfer means 39 _i, followed by, the parameter calculating unit 21 _i This feed force value P and the hopper weight scale 7
_i based on the weight signal w _i of computing the next Okuchikara value P + [Delta] P. The next Okuchikara value P + [Delta] P, since the first switching means 33 _i is Tsu cut the g terminal, not input before forwarding force value memory 22 _i, thus, before forwarding force value memory 22 _i The output force value P is a constant value. Therefore, as shown in FIG. 3B, the power feeding value is held at the power feeding value P (power feeding value P + ΔP) for a fixed time t1.

After the elapse of the certain time t1, the first time period shown in FIG.
The switching means 33 _i is switched to the f terminal and returns to the steady control again, and as shown in FIG. 3A, the amount of the object M to be weighed on the dispersion feeder 2 (FIG. 2) increases. Accordingly, FIG.
As shown in (b), the power transmission value decreases.

In the above configuration, in this combination weighing device, even in the insufficient state B, as shown in FIG.
Since the feeding force value is controlled, even in this insufficient state B, there is no fear that the supply amount to the weighing hopper 6 _i (FIG. 2) will be remarkably short, and therefore the weight will be too light relative to the target weight. There is no.

By the way, the object M to be weighed on the dispersion feeder 2 of FIG. 2 is sent to the weighing hopper 6 _i via the drive feeder 3 _i and the pool hopper 4 _i , so that the feeding force is as shown in FIG. The change of the value is slightly behind the change of the object to be weighed M on the dispersion feeder 2 (FIG. 2). Moreover, the amount of the object M to be weighed on the dispersion feeder 2 in FIG. 2 is rapidly increased and recovered by the conveyor 1. Therefore, even if the supply amount suddenly increases, the feeding force value does not become sufficiently small, and if the normal control similar to the states A and B is continued after the point E in FIG. 3, the weighing hopper 6 _i ( The object to be weighed M supplied to FIG. 2) becomes abnormally large. On the other hand, in this combination weighing device, the power transmission value P when the normal state is changed to the shortage state is used to set the power transmission value when the shortage state is returned to the normal state. Therefore, there is no possibility that the supply amount to the weighing hopper 6 _i will be abnormally increased.

Further, when the normal control is immediately returned to the normal state, there is a slight delay in the supply amount to the weighing hopper (FIG. 2) 6. As indicated by the dotted line, the power feeding value may increase, which may cause the same inconvenience. On the other hand, in this embodiment, for a certain period of time t1 after recovery to the normal state (for a state satisfying a predetermined condition), the feeding force value is set to a constant value P (feeding value P +
Since it is held at ΔP), the situation where the supply amount to the weighing hopper 6 _i (FIG. 2) becomes abnormally large does not occur.

By the way, in the above embodiment, the normal state C
For a certain period of time t1 immediately after the recovery, the feed force value is held at a constant value P (feed force value P + ΔP), but it is not always necessary to hold it and immediately after returning to the normal state C, as shown in FIG.
As in (c), the normal feedback control may be started based on the power transmission value P.

In the above embodiment, the holding force 36 _i of FIG.
_By not writing to _i and setting the sending force value to P + ΔP, the sending force value was kept substantially constant.
Between (FIG. 3 (b)), it continues to send Okuchikara value P of Okuchikara value memory 38i at lower feeder drive control unit 30 _i, may be kept Okuchikarachi constant. An example of this is shown in the second embodiment of FIG.

In FIG. 4, the feed force value of the parameter calculation unit 21 _i is output to the feeder drive control unit 30 _i via the second switching means 42 _i . On the other hand, transfer means 39
_{As for i} , the sending power value stored in the sending power value memory 38 _i at the lower limit is output to the previous sending power value memory 22 _i via the first switching means 33 _i , and the second switching means 42 is also provided. Output to _i . The second switching means 42 _i is the holding means 3
Upon receiving the switching signal d from 6, the terminal h is switched to the terminal j. Further, similarly to the above, the first switching means 33 _i receives the switching signal d from the holding means 36 and switches the terminal f to the terminal g.

Therefore, in the normal state A and the insufficient state B shown in FIG. 3A, as shown in FIG. 4, the first and second switching means 33 _i and 42 _i respectively have
It is connected to the f and h terminals. On the other hand, when the insufficient state B shown in FIG. 3A is changed to the normal state C, the first and second switching means 33 _i and 42 _i shown in FIG. receiving, mode is changed f and h terminal is in g and j terminal, with constant Okuchikara value P stored in Okuchikara value memory 38 _i when the limit is input to the feeder drive control unit 30 _i, Previously sent power value memory 22
stored in _i . The rest of the configuration is similar to that of the first embodiment of FIG. 1, and the same portions or corresponding portions are designated by the same reference numerals and the description thereof is omitted.

FIG. 5 shows a third embodiment. The third embodiment has a hopper weight discriminating means 44 _i . The hopper weight discriminating means 44 _i has a map and receives the weight signal w _i from the hopper weight scale 7 _i . From the weight signal w _i , the hopper weight discriminating means 44 _i discriminates whether or not the measured value of the hopper weight scale 7 _i is larger than a predetermined value, and the measured value becomes larger than the predetermined value. At this time, the hold release signal s _i is output to the hold means 36 _i . That is, the holding means 36
_i is a predetermined time t1 (FIG. 3) instead of outputting only the switching signal d _i, (for a predetermined condition is satisfied state) until the weighing value becomes a predetermined value, and outputs a switching signal d _i. In addition,
The above-mentioned predetermined value is set to a value at which combination weighing is achieved by a combination of a predetermined number of weighing hoppers 6 _i (FIG. 2). Other configurations are the same as those of the second embodiment of FIG. 4, and the same portions or corresponding portions are designated by the same reference numerals and the description thereof will be omitted.

By the way, in each of the above-mentioned embodiments, the power transmission parameter setting means 20 _i sets a new power transmission value based on the previous power transmission value and the measured value. However, the power transmission parameter setting means 20 _i may be any one that sets a new power transmission value based on the power transmission value and the measured value up to the previous time. The sending force value and the weighing value up to the last time include various values such as the sending force value and the weighing value of the immediately preceding time (one time before), and the average value of the sending force value and the weighing value of several times before the one time before. It is possible to use things.

Further, in each of the above embodiments, when the normal state A changes to the shortage state B as shown in FIG.
The feeding force value P of (point) is used as it is as the previous feeding force value P when returning from the insufficient state B to the normal state C, but it is not always necessary to do so, for example, the model of the combination weighing device. As shown in FIG. 3D, depending on the factory or the factory used, the previous value of the power feeding value P2, which is larger than the power feeding value P, or a small power feeding value, is returned from the insufficient state B to the normal state C. May be

Further, in the above embodiment, the threshold value for the amount of the object M to be weighed on the dispersion feeder 2 (FIG. 2) of FIG. 3A is set to one. However, in the present invention, the threshold value at the time of shifting from the normal state A to the shortage state B and the shortage state B
The threshold value for returning from the normal state C to the normal state C may be slightly different from each other.

In the above embodiment, the case where the pool hopper 4 _i shown in FIG. 2 is provided has been described, but the present invention does not necessarily require the pool hopper 4 _i . Also,
It goes without saying that another conveyor such as a conveyor may be used as the drive feeder 3 _i .

[0042]

As described above, according to the present invention, when the amount of the object to be weighed upstream of the drive feeder becomes insufficient from the normal amount, the feeding force value at that time is stored,
After that, when the amount of the object to be weighed upstream of the drive feeder returns from the insufficient amount to the normal amount, the stored power transmission value is output to the power transmission parameter setting means as the previous power transmission value, and the storage is performed. Since the feedback control is performed on the basis of the sent force value, there is no fear that the supply amount to the weighing hopper will be excessive when the normal amount is restored. On the other hand, the feed force parameter setting means performs feedback control even when the amount of the object to be weighed on the upstream side of the drive feeder is insufficient, so that there is no fear that the amount supplied to the weighing hopper will be excessively light. In this way, it is possible to prevent the supply amount to the weighing hopper from being excessive or deficient, so that it is possible to prevent the defective combination and the generation of the weighing hopper that cannot be used for selection of the combination, and improve the efficiency.

Further, according to the second aspect of the present invention, the feed force value is held within a certain range immediately after the amount of the object to be weighed upstream of the driving feeder has returned from a shortage amount to a normal amount.
Even if there is a slight delay in the increase in the supply amount of the weighing hopper, it is possible to prevent the sending force value from rapidly increasing, so that it is possible to prevent an abnormal increase in the supply amount to the weighing hopper.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a control device of a combination weighing device showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a general combination weighing device.

FIG. 3A is a characteristic diagram showing a change in the amount of the objects to be weighed on the dispersion feeder, and FIGS. 3B to 3D are characteristic diagrams showing a change in the feeding force value.

FIG. 4 is a schematic configuration diagram of a control device of a combination weighing device showing a second embodiment.

FIG. 5 is a schematic configuration diagram of a control device of a combination weighing device showing a third embodiment.

FIG. 6 is a conceptual diagram showing a basic configuration of a combination weighing device.

FIG. 7 is a characteristic diagram showing a change in a conventional feeding force value.

[Explanation of symbols]

3 _i ... Drive feeder, 6 _i ... Weighing hopper, 7 _i ... Hopper weight measuring device, 20 _i ... Sending parameter setting means, 30 _i
... Feeder drive controller, 36 _i ... Hold means, 38 _i
... (at the lower limit) the power transmission value memory, 39 _i ... Transfer means.

Claims (2)

[Claims] 1. A feeder drive control unit for driving a drive feeder for feeding an object to be weighed from upstream to a plurality of weighing hoppers in accordance with a value of a set feeding parameter, and a hopper weight weighing device provided in the weighing hopper. And a combination control means for selecting a combination of objects to be weighed based on the measured value of the, the new feed force value of each drive feeder, In addition to setting based on the above-mentioned weighing value, even when the amount of the object to be weighed upstream of the driving feeder has become insufficient from the normal amount, the value of the above-mentioned feeding parameter is continuously set. Means, a memory for storing the value of the feed force parameter at that time when the amount of the object to be weighed upstream of the drive feeder becomes insufficient from the normal amount, and the drive feeder. When the amount of the object to be weighed upstream of the feeder returns from the insufficient amount to the normal amount, the value of the force-feeding parameter based on the value stored in the memory is used as the value of the force-feeding parameter up to the previous time. A combination weighing device comprising a transfer means for outputting to a parameter setting means. 2. The feeding force output to the drive feeder according to claim 1, in a state in which a predetermined condition is satisfied after the amount of the object to be weighed upstream of the drive feeder returns from the insufficient amount to the normal amount. A combination weighing device having a holding means for holding a value of a parameter.