JPH0519924B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field of the Present Invention> The present invention relates to a combination used when items having varying individual weights are combined to a target weight and packed into bags, etc. Concerning a weighing device.

<Prior art> (Figure 5) When weighing objects that have individual weight variations are combined to obtain a predetermined weight, the larger the number of combinations, the more
Conventionally, a combination weighing device as shown in FIG. 5 has been used because the accuracy of the combined weight is high.

That is, the objects to be weighed that are supplied from the plurality of feeders 1 ₁ to 1 _o to the intermediate hoppers 2 ₁ to 2 _o , respectively, are transferred to the weighing hoppers 4 ₁ to 4 from the discharge gates 3 ₁ to 3 _{2 o of} the intermediate hoppers 2 ₁ to 2 o. _o are sequentially supplied to each of the storage chambers 5 ₁ to 5 _2o . The objects to be weighed supplied to each of the storage chambers 5 ₁ to 5 _2o are sequentially weighed and measured by measuring devices 6 ₁ to 6 _o provided for each of the weighing hoppers 4 ₁ to 4 _o .
This measurement signal is sent to the control device 7, and by calculating each measurement value and the measurement value, each storage chamber 5 ₁ -
5 The weight value of the object to be weighed stored in _2o is determined,
A combination of these weight values is calculated.

As a result of this combination calculation, the optimal combination is selected, and the discharge gates 8 ₁ - 8 _2o of the storage chambers 5 ₁ - 5 _2o storing the selected objects to be weighed are opened, and the selected objects to be weighed are removed. are collected and discharged via the collection sheet 9.

The objects to be weighed are supplied to the empty intermediate hoppers 2 ₁ to 2 _o from the feeders 1 ₁ to 1 _o , and the storage chambers 5 ₁ of the empty weighing hoppers 4 ₁ to 4 _o are selected in combination.
-5 Objects to be weighed are sequentially supplied to _2o , but during this time, the next combination calculation is performed, and the objects to be weighed are collectively discharged.

Therefore, highly accurate measurement cannot be performed by each of the measuring instruments 6 ₁ to 6 _o unless the weighing signal is sufficiently stabilized after the object to be weighed is supplied to the storage chamber.

For this reason, conventionally, after an object to be weighed is supplied to one storage chamber of a weighing hopper, until the weighing signal becomes sufficiently stable, objects to be weighed in other storage chambers of that weighing hopper are not selected for combination selection. By excluding it, it was controlled so as not to disturb the weighing measurements.

<Problems to be Solved by the Present Invention> However, in this way, when all the storage chambers of the weighing hopper whose measurement has not been completed are prevented from participating in the combination, the number of storage chambers that can participate in the combination is Since the number of storage rooms per hopper also decreases, the probability of obtaining an optimal combination decreases significantly.

In this case, the effect of increasing the number of possible combinations by providing a plurality of storage chambers per measuring instrument is halved, and the accuracy and efficiency corresponding to the number of storage chambers cannot be obtained.

<Objective of the present invention> The present invention has been made in view of the above-mentioned circumstances, and even when an object to be weighed is put into one of the storage chambers of the weighing hopper and the object is being weighed, the object is not stored in that storage chamber. To provide a combination weighing device which allows objects to be weighed in other connected storage chambers to participate in combination and prevents deterioration of accuracy and efficiency of combined weight.

<One Embodiment of the Present Invention> (FIGS. 1 to 4) An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention, and FIG. 2 is a block diagram showing the main parts of the control device.

In the figure, numeral 11 is a feeder that sequentially supplies objects to be weighed to a circular feeder 12. Circular feeder 1
N intermediate hoppers 14 ₁ to 2 are located below the periphery of
14 _o are arranged in a circle, each feeder 13 ₁
Objects to be weighed are sequentially supplied through 13 _o .

Weighing hoppers 16 ₁ to 16 _o each having two storage chambers 17 ₁ to 17 _{2 o} are installed below the intermediate hoppers 14 _{1 to} 14 o. Intermediate hopper 14
The objects to be weighed stored in ₁ to 14 _o are discharged through the discharge gate 1.
When opening 5 ₁ to 15 _2o , each weighing hopper 16 ₁
~ _16o to storage chambers ₁₇₁ to _172o .

The feeders 13 ₁ to 13 _o and the intermediate hoppers 14 ₁ to 14 _o form a means for supplying objects to be weighed in the combination weighing device.

One weighing device 18 ₁ to 18 _o is installed in each of the weighing hoppers 16 ₁ to 16 _o , and they are connected together so that the weight of the items stored in any of the two storage chambers is the same. Detected by two measuring instruments.

A collection chute 20 is installed below the weighing hoppers 16 ₁ to 16 _o . Each weighing hopper 16 ₁
When the discharge gates 19 ₁ to 19 2 _o are opened, the objects to be weighed stored in 16 o to _{16 o} are transferred to the collection chute 2.
Fall to 0.

A packaging machine 22 is installed below the collection chute 20. At the bottom of the collection chute 20, a timing hopper 21 is provided which opens at regular intervals.

Weighing signals from the scales 18 ₁ to 18 _o are sent to weight calculation circuits 24 ₁ to 24 _o of the control device 23 .

The weight calculation circuits 24 ₁ to 24 _o receive the weighing signals and calculate the weight calculation circuits 24 1 to 24 o to each storage chamber 17 ₁ to each of the weighing hoppers 16 ₁ to 16 _o .
17 Calculate the weight value of the object to be weighed stored in _2o for each storage chamber, and store each weight value.

That is, as shown in FIG.
The measured value from 8 ₁ is sent to the subtractor 25 ₁ . The subtractor 25 ₁ calculates the weighing hopper 16 ₁ from the measured value.
The value stored in the weight memory 26 ₁ that stores the weight value of the object to be weighed in the storage chamber 17 ₁ on one side (for example, the left side) is subtracted. This subtraction result is transmitted to the switch 27, which is turned on by the completion signal _A1 indicating the completion of the weighing measurement.
₁ , it is stored in the weight memory 28 ₁ as the weight value of the object to be weighed in the other (right side) storage chamber 17 ₂ .

Similarly, the subtracter 29 ₁ subtracts the value stored in the weight memory 28 ₁ from the input weight value, and this subtraction result is turned ON by an opening/closing signal B, which will be described later.
The weight value of the object to be weighed in one (left) storage chamber 17 ₁ is stored in the weight memory 26 ₁ via the switch 30 ₁ .

Note that when the object to be weighed stored in _either storage chamber is discharged, _" 0” grams are stored. Note that the switch 31 ₁ is a switch that opens and closes in response to a discharge signal C, which will be described later.
Similarly, the switch 32 ₁ is a switch that opens and closes in response to the discharge signal D.

The weight values of the objects to be weighed in each of the storage chambers 17 ₁ to 17 _2o stored in each of the weight storage devices 26 ₁ to 26 _o and 28 ₁ to ₂₈ o are sent to the combination selection circuit 35 .

The combination selection circuit 35 selects each storage chamber 17 ₁ to _{17 2}
a combination calculation unit 35a that calculates all different combination weights based on the weight value of _the object to be weighed;
The weight setting unit 35b that stores the set weight sets and stores the combined weight output of the combination calculation unit 35a and the set weight output of the weight setting unit 35b, and selects the combination of weighing hoppers that provides the smallest difference from the set weight. and a determination unit 35c that outputs a combination selection signal corresponding to the combination.

The supply and discharge control circuits 40 ₁ to 40 _o receive the combination selection signal and select the corresponding weighing hopper 1.
A designated one of the discharge gates ₁₉₁ to _192o of ₆₁ to _16o is opened to discharge the object to be weighed, and the discharge gate of the intermediate hopper to the storage chamber of the discharged weighing hopper is opened.

Furthermore, the feeder corresponding to the empty intermediate hopper is driven to supply the object to be weighed to the empty intermediate hopper.

Here, for example, the supply/discharge control circuit 40 ₁ is configured as shown in FIG. 3.

In the figure, the combination selection signal from the combination selection circuit 35 is input to the discharge gate timers TM1 ₁ and TM2 ₁ corresponding to the left and right storage chambers 17 ₁ and 17 ₂ , respectively. Ejection gate timer TM1 ₁ , TM2 ₁
constitutes the discharge control means of this combination weighing device, and consists of a multivibrator, etc. When a pulse indicating that the combination has been selected is input, a certain period of time T ₁ ( That is, the "H" level voltage is output for only the time required for the object to be weighed to be completely ejected from the storage chamber. The output of one discharge gate timer _TM11 is
As the discharge signal _D1 , the switch ₃₂₁ of the weight calculation circuit ₂₄₁ is opened and closed, and the discharge gate on the storage chamber ₁₇₁ side is opened and closed. Similarly, the output of the other discharge gate timer TM2 ₁ is used as the discharge signal C ₁ to open and close the switch 31 ₁ of the weight calculation circuit 24 ₁ and
7 Open and close the discharge gate on _{the 2} side.

Ejection gate timer corresponding to right side storage chamber 17 ₁
The combination selection signal input to _TM11 is input to the clock input of flip-flop _FF11 .
The D input of the flip-flop _FF11 is fixed at the "L" level, and the H level output from its output Q is sent to the combination selection circuit 35 (not shown) as a combination permission signal, and its inverted output is sent to the AND circuit. 41 is input to one input terminal of ₁ .
The output of the discharge gate timer _{TM1 1 is} inverted and input to the other input terminal of the AND circuit 41 1 via an inverter 42 ₁ .

The output of the AND circuit 41 ₁ is input to the first input terminal of the 3-input AND circuit 43 ₁ . The output of AND circuit ₄₃₁ is flip-flop FF2
₁ , and is also input to one input terminal of the OR circuit ₄₄₁ . Also,
The inverted output of the flip-flop _FF21 is input to the second input terminal of the AND circuit ₄₃₁ ,
The output Q is input to one input terminal of the AND circuit 45 ₁ and also to one input terminal of the AND circuit 46 ₁ .

The output of the AND circuit ₄₆₁ is a flip-flop
FF1 ₁ set terminal and flip-flop FF2 ₁
is input to the reset terminal of the OR circuit 4.
7 Input to one input terminal of ₁ . Also,
The output of this AND circuit 46 ₁ is the measurement completion signal B ₁
As a result, the switch 30 ₁ of the weight calculation circuit 24 ₁ is opened and closed.

On the other hand, the output of the OR circuit 44 ₁ is the AND circuit 48 ₁
is input to one input terminal of AND circuit 48 ₁
The output of is input to the set terminal of flip-flop _FF31 . Flip Flop FF3 _1D
The input is fixed at the "L" level, and its output Q is input to one input terminal of the NOR circuit ₄₉₁ . Further, the output of the NOR circuit 49 ₁ is input to the other input terminal of the AND circuit 48 ₁ . Further, the inverted output of the flip-flop FF3 ₁ is input to one input terminal of the NOR circuit 50 ₁ .
The output of NOR circuit ₅₀₁ is the intermediate gate timer TM
3 ₁ , and the intermediate gate timer TM3 ₁
When a pulse is input, it outputs an "H" level for a certain period of time _T2 (ie, the time required for the object to be weighed to be completely ejected from the intermediate hopper) from the rise of the pulse.

The output of the intermediate gate timer TM3 ₁ is input to the other input terminal of the AND circuit 45 ₁ , and the output of the AND circuit 45 ₁ is input to the discharge gate of the intermediate hopper 14 ₁ corresponding to the left storage chamber 17 ₁ of the weighing hopper 16 ₁ . 1
5 Serves as a signal output for opening and closing ₁ . Further, the output of this intermediate gate timer _TM31 is used as the clock input of the flip-flop _FF31 and the NOR circuit 49.
The feeder drive _timer TM is input to the other input terminal of _the
4 It is input to ₁ . Feeder drive timerTM
₄₁ outputs an "H" level output for a certain period of time _T3 from the rise of the input pulse (that is, the time required to supply approximately a predetermined amount of the object to be weighed to the intermediate hopper), the current amplifier ₅₂₁ and the NOR circuit 50. ₁ and the other input terminal. The current amplifier ₅₂₁ operates while the output from the feeder drive timer _TM41 is at "H" level.
Drive the feeder ₁₃₁ .

In addition, flip-flops FF2 ₁ , FF3 ₁ , intermediate gate timer TM3 ₁ and feeder drive timer
_TM41 , together with a flip-flop _FF61 to be described later, forms a supply control means of this combination weighing device, and sequentially supplies new objects to be weighed to the storage chamber from which the objects to be weighed have been discharged.

The output of the intermediate gate timer TM3 ₁ is input to one input terminal of the AND circuit 53 ₁ , and the other input terminal of the AND circuit 53 ₁ receives an extremely high frequency rectangular wave signal from the rectangular wave oscillator 54 ₁ . has been added. The output of the AND circuit ₅₃₁ is input to the supply stability timer _TM51 , and the supply stability timer _TM51 determines a predetermined supply stabilization time _T4 from the rising edge of the input pulse (i.e., the object to be weighed falls and is supplied to the weighing hopper). The "H" level is output for a period of time from when the measured value is stabilized until the measured value becomes stable. The supply stabilization timer _TM51 is a re-trigger type timer that, when the next pulse is input during the timer operation, keeps the output at the "H" level for an additional period of _T4 from that time.

The output of the square wave oscillator 54 ₁ is output from the AND circuit 55 ₁
The output of the OR circuit 56 ₁ having the outputs of the discharge gate timers TM1 ₁ and TM2 ₁ as inputs is input to the other input terminal of the AND circuit 55 ₁ . . The output of the AND circuit ₅₅₁ is input to the discharge stabilization timer _TM61 , and the discharge stability timer _TM61 is used for a predetermined discharge stabilization time _T5 from the rising edge of the input pulse (that is, until the object to be weighed is discharged from the weighing hopper). After that,
The "H" level voltage is output for only the time required for the measurement signal of the measuring instrument to stabilize.

This discharge stability timer TM6 ₁ forms a timing delay circuit of this metering device together with a NOR circuit 57 ₁ described later, and the supply stability timer TM
When either of the discharge gate timers TM ₁ and TM ₂ is activated during the operation of 57 ₁ , the timing at which the output of the NOR circuit 57 ₁ returns to the H level is delayed by at least the discharge stabilization time, and the metering completion signal A ₁ is output. , B Delays the output timing of ₁ .

Discharge stability timer TM5 ₁ is supply stability timer
Like the _TM51 , this is a re-trigger type timer that holds the output at the "H" level for an additional _T5 from that point on when the next pulse is input during the timer operation.

Supply stability timer TM5 ₁ and discharge stability timer TM
The output of the NOR circuit ₅₇₁ is input to both input terminals of the NOR circuit ₅₇₁ , and the output of the NOR circuit ₅₇₁ is input to the clock input of the flip-flop _FF41 . The D input of the flip-flop FF4 ₁ is fixed at the "H" level, and its output Q is input to the other input terminal of the AND circuit 46 ₁ . Furthermore, the output of the OR circuit 47 ₁ is input to the reset terminal of the flip-flop FF 4 ₁ .

On the other hand, the combination selection signal input to the discharge gate timer TM2 ₁ corresponding to the right storage chamber 17 ₂ is as follows.
Similar to the left side, its D input is input to the clock input of flip-flop _FF51 which is fixed at the "L" level. And flipflop FF5 ₁
The H level output from the output Q of is sent to the combination selection circuit 35 as a combination permission signal (not shown), and its inverted output is input to one input terminal of the AND circuit ₅₈₁ , and the other input terminal is , the output of the discharge gate timer TM2 ₁ is output from the inverter 59 ₁
It is inverted input via.

The output of the AND circuit 58 ₁ is input to the first input terminal of the 3-input AND circuit 60 ₁ , and the second input terminal is input to the AND circuit 41 ₁ .
The output is inverted and inputted via the inverter ₆₁₁ . Furthermore, the inverted output of the flip-flop _FF21 is input to the third input terminal.

The output of the AND circuit ₆₀₁ is a flip-flop
It is input to the set terminal of the FF 6 ₁ and also to the other input terminal of the OR circuit 44 ₁ .
Also, the inverted output of flip-flop _FF61 is
It is input to the third input terminal of the AND circuit 43 ₁ , and the output Q is input to the two AND circuits 62 ₁ ,
63 ₁ is input to one input terminal of each.

The output of the intermediate gate timer TM3 ₁ is input to the other input terminal of the AND circuit 62 ₁ , and the output of the AND circuit 62 ₁ is input to the other input terminal of the AND circuit 62 ₁ .
This is a signal output for opening and closing the discharge gate 15 ₂ of the intermediate hopper 14 ₁ corresponding to the right side storage chamber 17 ₂ .

Further, the output Q of the flip-flop _FF41 is input to the other input terminal of one AND circuit ₆₃₁ , and the output of the AND circuit ₆₃₁ is connected to the set terminal of the flip-flop _FF51 and the reset terminal of the flip-flop _FF61 . It is also input to the other input terminal of the OR circuit ₄₇₁ . Further, the output of the AND circuit 63 ₁ opens and closes the switch 27 ₁ of the weight calculation circuit 24 ₁ as a measurement completion signal A ₁ .

Note that N sets of the above-mentioned measured value calculation circuit 24 ₁ and supply/discharge control circuit 40 ₁ are provided in exactly the same manner for each of the measuring instruments 18 ₁ to 18 _o .

<Operation of the above-mentioned embodiment> Next, the operation of the above-mentioned embodiment will be explained based on the above-mentioned drawings and the time chart of FIG. 4.

In advance, the storage chambers 17 _{1 to 17 o of all intermediate hoppers 14 1} to _{14 o} and weighing hoppers 16 _{1 to} 16 _o accommodate objects to be weighed, and the weight calculation circuit 2
4 ₁ to 24 _o weight storage devices 26 ₁ to 26 _o , 28 ₁ to 2
It is assumed that the weight value of the object to be weighed in each storage chamber is stored in 8 _o .

It is also assumed that the flip-flops FF1 ₁ -FF1 _o and FF5 _{1 -FF5 o} of the supply/discharge control circuits 40 ₁ -40 o are set, the other flip-flops are in a reset state, and each timer is not in an operating state.

The weight storage values of the weight calculation circuits 24 ₁ to 24 _o are sent to the combination calculation section 35 a of the combination selection circuit 35 .

The combination calculation unit 35a of the combination selection circuit 35 calculates combination weights for all different combinations based on the weight values of the storage chambers whose combination permission signal is at the "H" level. The determination unit 35c determines the optimal combination weight for the set weight set in the weight setting unit 36b, and as a result, supplies a combination selection signal corresponding to each storage chamber selected for combination to the discharge control circuits 40 ₁ to 40 . Send at 40 _o .

Here, for example, the storage chamber 1 of the weighing hopper 16 ₁
When the objects to be weighed stored in 7 ₁ and 17 ₂ are selected for combination selection at the same time, both discharge gate timers TM are activated at t ₀ as shown in the time chart of Fig.
Combination selection signals are input to TM1 ₁ and TM2 ₁ , respectively. (Figure 4 a, b).

When the combination selection signal is input, both discharge gate timers TM1 ₁ and TM2 ₁ operate, c,
As shown in d, the output is at the "H" level from time _t0 to time _T1 . This output is the discharge signal C ₁ ,
Discharge gate 19 ₁ , 1 of weighing hopper 16 ₁ as D ₁
9 ₂ is opened, the objects to be weighed in both storage chambers 17 ₁ and 17 ₂ are allowed to fall and collect in the collection chute 20, and the switches 31 ₁ and 31 ₁ of the weight calculation circuit 24 ₁ are turned on.
, both switches 31 ₁ and 32 ₁ turn on,
"0" is stored in both weight memories 26 ₁ and 28 ₁ .

Also, from time t ₀ , both discharge gate timers TM1 ₁ ,
Since the TM2 ₁ output becomes "H", the emission stability timer TM6 ₁ is activated and its output becomes "H" level for T ₁ +T ₅ hours (Fig. 4i).

In addition, due to the input of the combination selection signal, the outputs Q of flip-flops FF1 ₁ and FF5 ₁ both become "L" level from time t ₀ (Fig. 4 j, k), and the inverted output becomes "H" level. . At time t ₁ , when T ₁ hour has elapsed from time t ₀ , the output of the discharge gate timer TM1 ₁ becomes "L" level, so the output of AND circuit 41 ₁ becomes "H" level, and AND circuit 43 ₁ becomes positive. The pulse is output to the set terminal of the flip-flop _FF21 and the OR circuit ₄₄₁ . On the other hand, the output of the AND circuit ₅₈₁ also goes to "H" level.
AND circuit 60 ₁ by inverter circuit 61 ₁
The output remains at "L" level.

The output Q of the flip-flop _FF21 set by the AND circuit ₄₃₁ becomes "H" level and is input to the AND circuit ₄₅₁ . Further, the positive pulse from the AND circuit ₄₃₁ is sent to the flip-flop FF via the OR circuit ₄₄₁ and the AND circuit ₄₈₁ .
In order to set the timer _TM31 , its inverted output operates the intermediate gate timer _TM31 via the NOR circuit ₅₁₁ . Intermediate gate timer TM3 ₁ starts from t ₁ o'clock
In order to output "H" level for T ₂ hours, the output of AND circuit ₄₅₁ is synchronized with this and "H" for T ₂ hours.
Output the level (Fig. 4e). Also, at this time,
Since flip-flop _FF61 is not set, the output of AND circuit ₆₂₁ remains at the "L" level (FIG. 4f).

Further, when the output of the AND circuit ₄₅₁ becomes "H" level, the left discharge gate 1 of the intermediate hopper ₁₄₁
5 ₁ is opened, the object to be weighed is supplied to the left storage chamber 17 ₁ of the weighing hopper 16 ₁ , and weighing and measurement by the weighing device 18 ₁ is started.

Further, at time _t1 , when the intermediate gate timer _TM31 goes to the "H" level, the supply stabilization timer _TM51 is activated and its output goes to the "H" level for _T2 + _T4 hours (Fig. 4h).

and intermediate gate timer at t _{2 hours} later
When the _TM31 output changes to “L” level, the feeder drive timer _TM41 is activated via the inverter _511.
is activated, and its output remains at the "H" level from _t2 to _T3 (Fig. 4g). This "H" level output is amplified by the current amplifier ₅₂₁ , and the feeder 1
3 ₁ is driven and a new object to be weighed is placed on feeder 1.
3 ₁ to the intermediate hopper 14 ₁ .

At _t3 , which is ₄ hours _T2 +T after _t1 , the output of the supply stability timer _TM51 changes to the "L" level, so the clock input of the flip-flop _FF41 rises, and its output Q goes to the "H" level. is set. This output Q sets flip-flop _FF11 through AND circuit ₄₆₁ , and resets flip-flop _FF21 and flip-flop _FF41 .

Therefore, the output Q of flip-flop _FF11
becomes "H" level (FIG. 4j), and this H level output is sent to the combination selection circuit 35 as a combination permission signal.

Further, at this time (at time _t3 ), the positive pulse of the AND circuit 46 ₁ is sent to the weight calculation circuit 24 ₁ as a measurement completion signal B ₁ , and the switch 30 ₁ is turned on.

As a result, the stored value (in this case "0") of the weight memory 28 ₁ that stores the weight value of the object to be weighed in the right storage chamber 17 ₂ is subtracted from the sufficiently stable measured value of the scale 18 ₁ . The subtraction result is stored in the weight memory 26 ₁ as the weight value of the left storage chamber 17 ₁ .

As described above, the weighing and measurement of the objects to be weighed supplied to the left storage chamber 17 ₁ is completed, and this weight value is sent to the combination selection circuit 35 .

At time _t3 when the weighing of the left storage chamber ₁₇₁ is completed, the inverted output of the flip-flop _FF11 becomes "L" level, so the output of the AND circuit ₄₁₁ also becomes "L" level.
level. This output is input to the AND circuit ₆₀₁ via the inverter ₆₁₁ , and since the other inputs also remain at the "H" level, the output of the AND circuit ₆₀₁ becomes the "H" level and the flip-flop FF
6 ₁ is set.

When flip-flop _FF61 is set, _FF31 is set via the OR circuit ₄₄₁ , as in the case of the left storage chamber, and the intermediate gate timer is set.
_TM31 is activated, and the output of the AND circuit ₆₂₁ is at the "H" level from time _t3 to time _T2 (FIG. 4f).

Therefore, the discharge gate 15 ₂ on the left side of the intermediate hopper 14 ₁ is opened, the object to be weighed is supplied to the right storage chamber 17 ₂ of the weighing hopper 16 ₁ , and weighing measurement by the weighing device 18 ₁ is started.

Then, the intermediate gate timer TM3 ₁ starts from t ₃ o'clock.
When T returns to the "L" level after _two hours, the feeder drive timer _TM41 is activated and the object to be weighed is fed to the intermediate hopper ₁₄₁ (Fig. 4g).

Also, at _t3 , the intermediate gate timer _TM31 goes “H”.
When the level is reached, the supply stability timer TM5 ₁ operates again, and its output continues from t ₃ to T ₂ +T ₄ hours (that is, until the object to be weighed is supplied and the weighing signal from the scale 18 ₁ becomes sufficiently stable). It becomes "H" level (Fig. 4 h).

Here, the output of supply stability timer _TM51 is “H”
At _t4 when the level, that is, the measurement is not completed, the combination selection circuit 35 selects the left storage chamber 17 ₁
When the weight value of the objects to be weighed stored in the
1 ₁ (Figure 4a).

When the selection signal is input, the supply stability timer TM
5 Even if ₁ is in operation, the discharge gate timer TM
₁₁ is activated (Fig. 4c), the discharge gate ₁₉₁ of the left storage chamber 171 of the weighing hopper ₁₆₁ is opened for _T1 hour, the switch ₃₂₁ of the weight calculation circuit ₂₄₁ is turned on, and the weight is stored _. “0” is stored in the device ₂₆₁ .

Due to the operation of discharging the object to be weighed by opening and closing the discharge gate, the weighing signal of the weighing instrument ₁₈₁ is greatly disturbed, but as the output of the discharge gate timer _TM11 reaches the "H" level, the discharge stability timer is activated. TM
6 ₁ starts operating from t ₄ , and its timer output is T ₁ + T ₅
Since it is at the “H” level for a time, the flip-flop
The clock input to _FF41 is the discharge stability timerTM.
It does not rise until the output of 6 ₁ returns to the "L" level.

Therefore, the output timing of the metering completion signal _A1 from the AND circuit ₆₃₁ is determined by the emission stability timer.
It is delayed until the output of _TM61 returns to the "L" level.

At _T5 , when _T1 + _T5 hours have passed since _T4 , the clock input to flip-flop _FF41 rises, so its output Q goes to the "H" level and is sent to the combination selection circuit 35 as a combination permission signal. (Figure 4k). At this time, flip-flop FF6 ₁
is set, flip-flop FF51 is set via AND circuit ₆₃₁ , and flip-flop _FF61 and flip-flop _FF61 are set.
_FF41 is reset.

Also, the AND circuit 6 is delayed by the discharge stabilization time.
The weighing completion signal A ₁ from 3 ₁ is the weight calculation circuit 24 ₁
is output, and switch ₂₇₁ is turned on.

As a result, the weight value (“0” in this case) of the left storage chamber 17 ₁ stored in the weight storage device 26 ₁ is subtracted from the sufficiently stable measurement value of the measuring instrument 18 ₁ , and the subtraction result is is stored in the weight storage device 28 ₁ as the weight value of the right storage chamber 17 ₂ .

Furthermore, at time _t5 , since the flip-flop _FF61 is reset, the output of the AND circuit ₄₃₁ becomes "H" level again, and the flip-flop _FF21
is set. Therefore, in the same way as the operation from _t1 , the intermediate gate timer starts operating for _T2 from _t5 (Fig. 4e), and the object to be weighed is placed in the left storage chamber _171.
The supply stability timer _TM51 becomes "H" level for _T2 + _T4 hours (Fig. 4h). And t ₅
After T ₂ hours from time, feeder drive timer TM4 ₁ is activated.
After operating for T ₃ hours, the object to be weighed is supplied from the feeder 13 ₁ to the intermediate hopper 14 ₁ .

Further, at _t6 , when _T2 + _T4 hours have passed since _t5 , the output of the supply stability timer _TM51 becomes "L" level, so the flip-flop _FF11 is set, and a combination permission signal is output to the combination selection circuit 35 ( j) in Fig. 4, the state is the same as at time _t0 , and the same operation is repeated thereafter.

Note that similar control is performed for the other weighing hoppers 16 ₂ to 16 _o , and the combination selection circuit 35 selects a combination from among the objects to be weighed in all the storage chambers for which weighing has been completed. The objects to be weighed in the selected storage chambers are sequentially discharged and collected into the packaging machine 22 via the collection chute 20 and the timing hopper 21.

In addition, in the above embodiment, each weighing hopper 16 ₁ to
16 There were two storage rooms in each _o ,
The number of storage chambers is not limited to two, and two or more storage chambers may be provided in the weighing hopper. Further, in the above embodiment, priority was given to supplying the object to be measured to the left-hand storage chamber of the two storage chambers over the supply to the right-hand storage chamber, but this may be reversed.

<Effects of the present invention> As is clear from the above description, in the combination weighing device of the present invention, the object to be weighed supplied to any one of the plurality of storage chambers provided in the weighing hopper is Even while weighing and measurement are being performed, objects to be weighed in other storage chambers connected to the storage chamber can participate in combination selection.

Therefore, even when the combination discharge operation is performed continuously, the number of storage chambers that can be used for combination selection does not decrease significantly, and highly accurate metering operation can be performed efficiently.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of a combination weighing device according to the present invention, and FIG. 2 is a block diagram showing a measured value calculation circuit of the embodiment.
FIG. 3 is a block diagram showing a supply/discharge control circuit according to another embodiment, and FIG. 4 is a diagram showing a time chart of FIG. 3. FIG. 5 is a schematic configuration diagram of a conventional combination weighing device. 13 ₁ ~ 13 _o ... feeder, 14 ₁ ~ 14 _o ......
Intermediate hopper, 16 ₁ ~ 16 _o ...Measuring hopper, 18
₁ to 18 _o ...Measuring instrument, 23...Control device, 24 ₁
~24 _o ...Weight calculation circuit, 26 ₁ ~26 _o ... Weight memory device, 28 ₁ ~28 _o ... Weight memory device, 35...
...Combination selection circuit, 40 ₁ to 40 _o ... Supply and discharge control circuit, TM1 ₁ to TM1 _o ... Discharge gate timer,
TM2 ₁ ~ TM2 _o ...Discharge gate timer, TM3 ₁
~TM3 _o ...Intermediate gate timer, TM4 ₁ ~TM
4 _o ... Feeder drive timer, TM5 ₁ ~ TM5 _o ...
... Supply stability timer, TM6 ₁ to TM6 _o ... Discharge stability timer, FF1 to FF6 ... Flip-flop,
54 ₁ to 54 _o ...Square wave oscillator.

Claims (1)

[Claims] 1 P pieces connected together (P is an integer of 2 or more)
N weighing hoppers each having storage chambers, and N weighing object supplies provided corresponding to each of the weighing hoppers to sequentially supply objects to be weighed to the empty storage chambers of the corresponding weighing hoppers. means, N measuring devices provided corresponding to each of the weighing hoppers and outputting a weight signal corresponding to the total weight of the objects to be weighed in the corresponding weighing hopper; and a weight signal from each of the weighing devices. Receive each,
N weight calculation means for calculating the weight of the object to be weighed supplied to the empty storage chamber of the weighing hopper corresponding to the weighing device at a timing when a predetermined stable supply time has elapsed from the time of supply of the object to be weighed; 24 ₁ ~ 24 _o
and a combination selection means 35 for selecting an optimal combination of storage chambers by calculating a combination of weight values for each storage chamber calculated by each of the weight calculation means; discharge control means for opening and closing the discharge gate of the storage chamber of the weighing hopper to discharge and collect the objects to be weighed in the storage chamber;
TM1, TM2, and supply control means TM3, TM4 for causing the object to be weighed supplying means to supply a new object to be weighed to the storage chamber from which the object to be weighed has been discharged by the discharge control means.
and, provided corresponding to each of the weighing hoppers, from when the object to be weighed is supplied to one of the empty storage chambers of the corresponding weighing hopper until the supply stabilization time elapses, the storage chamber is filled. When another connected storage chamber is selected by the combination selection means, the timing of weight calculation by the weight calculation means corresponding to the weighing hopper is delayed by at least a predetermined discharge stabilization time TM6, and the combination is selected. A combination weighing device comprising N timing delay means for prioritizing discharge of objects to be weighed in a storage chamber selected as follows.