JPH0627665B2 - Combination weighing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field of the Present Invention> The present invention relates to a combination weighing device for collectively discharging set amounts of objects to be weighed, such as food items, which have variations in weight.

<Prior Art> (Figs. 9 to 10) When a plurality of sets of objects to be weighed, each having a variation in weight, are combined and put together for a set weight or set number, the larger the number of combinations, the set weight or set number. Since the accuracy of the combination weight or the number of combinations can be increased, the combination weighing device as shown in, for example, FIG. 9 has been conventionally used.

That is, the objects to be weighed supplied from the plurality of feeders 1 _-1 to 1 _-n to the intermediate hoppers 2 _-1 to 2 _-n are the intermediate hoppers 2 _-1.
To 2 discharge gate 3 provided on both sides of the _{-n -1} to 3 _- Opening a _2n, weighing hoppers 4 arranged two by two downwardly respectively
_-1 to 4 _- it is housed to _2n.

Two each of the weighing hoppers 4 _-1 to 4 _- The _2n, have been respectively installed one meter 10 _-1 to 10 _-n, also the weight value of the objects to be weighed in any of the weighing hoppers of the two It is calculated by the weight value calculation means 12 of the control device 11 based on the weight value signal from one weighing device.

FIG. 10 shows a weighing value computing means 1 corresponding to the weighing machine 10 _-1 .
It is a circuit showing 2 _-1 .

In the figure, 13 _-1 is an empty weighing value signal when the object to be weighed is not stored, that is, the weighing value signal due to the own weight of the weighing hoppers 4 _-1 , _4-2 (hereinafter referred to as a zero correction value and Note) is a correction value storage device that stores in advance via the switch 14 _-1 .

15 _-1 is a first subtractor for subtracting the zero correction value from the weighing value signal when the object to be weighed is stored in the weighing hopper on one side, and 16 _-1 is the first subtractor 15 _-1. It is a second subtractor for subtracting the weight value (stored value) of the weighed object stored in the weighing hopper on the other side from the output.

17 _-1 , 18 _-1 stores the subtraction result of the second subtractor 16 _-1 input via the switches 19 _-1 , 20 _-1 in the respective weighing hoppers 4 _-1 , 4 _-2. The weight storage unit 21 _-1 stores the weight value of the object to be weighed and the weight storage unit 21 _-1.
This is an adder that adds the weight values stored in 7 _-1 , 18 _-1 and outputs the result to the second subtractor 16 _-1 .

The weight storage devices 17 _-1 , 18 _-1 are reset to "0" when the objects stored in the corresponding weighing hoppers 4 _-1 , _4-2 are discharged. .

Therefore, when both of the weighing hoppers 4 _-1 , 4 _-2 are empty and the objects to be weighed are stored in the weighing hopper 4 _-1 from the intermediate hopper 2 _-1 , the weighing value signal from the weighing instrument 10 _-1 is sent. , The first subtractor 15 ₋₁ subtracts the zero correction value, and the second subtractor 16 ₋₁
The adder 21 ₋₁ output (“0” in this case) is subtracted.
The result of this subtraction is stored in one of the weight storage devices 17 _-1 via the switch 19 _-1 as the weight value of the object to be weighed stored in the weighing hopper 4 _-1 .

Next, when the object to be weighed is stored in the weighing hopper _4-2 , the zero point correction value is similarly subtracted from this weighing value signal, and secondly, it is stored in the weight storage unit 17 _-1 by the subtractor 16 _-1. and it is stored value (weight values of the objects to be weighed which are housed in the weighing hopper 4 _-1)
There is subtracted, the subtraction result, as the weight value of the objects to be weighed which have been accommodated in the weighing hopper 4 _-2, is stored via the switch 20 _-1 to the other weight storage unit 18 _-1.

In this way, each weighing hopper 4 _-1 to 4 _- weight values of the objects to be weighed which have been accommodated in _2n is obtained by the metric calculating unit 12,
Each weight value is output to the combination selection means 25.

The combination selection means 25 performs a combination calculation of each weight value, selects, for example, a combination having the smallest difference from the set weight, and sends a selection signal for the selected combination to the discharge control means 26.

The discharge control means 26 sends a discharge signal for opening the discharge gate of the weighing hopper accommodating the selected objects to be weighed, and collects the selected objects to be weighed 28.
Collected and discharged through.

Further, the supply control means 27 receiving this discharge signal causes the empty weighing hopper to supply a new object to be weighed from the intermediate hopper, and causes the empty intermediate hopper to supply the object to be weighed from the feeder.

As described above, the objects to be weighed are sequentially supplied to the emptied weighing hopper after the combination is selected.
A combination calculation is performed on the objects to be weighed that have been stored in the weighing hoppers that have been weighed and measured, and the objects to be weighed are sequentially collected and discharged.

Then, the measured value signals from the respective measuring instruments 10 _-1 to 10 _-n largely drift due to the ambient temperature change and the elapsed time. Also, the weighing hoppers 4 _-1 to 4 _- The _2n, may be deposited without being discharged between residue and the like of the objects to be weighed is long.

Therefore, in the conventional combination weighing device, in order to prevent a weighing error caused by a drift of the weighing device or a residue of the object to be weighed attached to the weighing hopper, the operation of the device is temporarily stopped at any time, and the objects stored in the weighing hopper are temporarily stopped. Discharge the objects to be weighed manually or wait for the objects to be weighed stored in the pair of weighing hoppers to be discharged at the same time.
The switches 14 _{-1 to} 14 _-n of each weighing value calculation means 12 are turned on.
Then, the zero point correction value for each of the measuring instruments 10 _-1 to 10 _{-n is} reset (hereinafter referred to as zero tracking).

<Problems to be Solved by the Present Invention> However, in the above-described manual zero tracking, each of the measuring instruments 10 _-1 to 10 -10 depending on the temperature change and the elapsed time.
Weighing error occurred because we could not deal with the drift of _-n in detail.

Further, it is very complicated to stop the operation of the device and perform the manual zero tracking frequently for all the weighing devices, which causes a problem that the operating rate of the device is significantly reduced.

Further, since the objects stored in the pair of weighing hoppers are less likely to be discharged at the same time, there is a problem that zero tracking cannot be frequently performed.

<Objects of the Present Invention> The present invention has been made in view of the above problems, and it is possible to easily and frequently perform the zero tracking operation in response to the drift of the weighing instrument or the adhesion of dust or the like on the object to be weighed. An object of the present invention is to provide a combination weighing device in which the device operation rate is less likely to decrease due to zero tracking operation.

<Means for Achieving the Above Purpose> (FIG. 1) In order to achieve the above object, the control means 40 of the combination weighing device of the present invention is, as shown in FIG. .., which have two storage chambers 31, 31, ..., Correction value storage means 41, 41, ... For storing the zero correction value for each weighing hopper 32, 32 ,.
Correction value storage means 41 based on the measured value signals from 33, ....
Based on the value obtained by subtracting the zero correction value stored in a, 41a, ..., The weight value of the objects to be weighed stored in the respective storage chambers 31, 31 ,. Alternatively, the weight value calculating means 4 for calculating at least one of the number values
2, 42, ... And based on at least one of the weight value or the number value of the objects to be weighed calculated by the weight value calculating means 42, 42 .. By controlling the combination selecting means 43 for selecting an equal combination and the discharging means 34, 34, ... Independently provided for each of the storage chambers 31, 31 ,.
Ejection control means 44, 44, ... For ejecting the objects to be weighed in all the storage chambers 31, ... Included in the combination selected by the combination selection means 43, and supply means 35, 35.
.. and supply control means 45, 45, ... for supplying a new object to be weighed to the storage chamber 31 ,. All the storage rooms 31, 31, ... owned by the hopper 32.
By the supply prohibiting means 46, 46, ... For prohibiting the supply of the object to be weighed from the supply means 35 by the corresponding supply control means 44 until the object to be weighed stored in is discharged. All the storage chambers 31, 31, ... Owned by the weighing hopper 32 whose supply of the objects to be weighed is prohibited.
Zero tracking control means 4 for storing and setting a new zero point correction value in the correction value storage means 41 corresponding to the weighing hopper 32 when the object to be weighed stored in is discharged.
It has 7, 47, and so on.

<Operation> Therefore, when the objects to be weighed stored in all the storage chambers 31, 31, ... Owned by the weighing hopper 32 for which new supply of the objects to be weighed is prohibited by the supply prohibiting means 46 are discharged. The zero tracking control means 47 stores and sets a new zero point correction value in the correction value storage means 41 corresponding to the weighing hopper 32.

When the supply prohibition of the object to be weighed by the supply prohibition changing means 46 is released and new objects to be weighed are successively stored in the storage chambers 31, 31, ... Of the weighing hopper 32, the weighing hopper 3
Based on the result of subtracting the new zero point correction value stored in the correction value storage means 41 from the weighing value signal from the weighing means 34 corresponding to No. 2, they are sequentially stored in the respective storage chambers 31, 31, .... At least one of the weight value and the number value of the objects to be weighed is calculated by the weight value calculation means 42.

Next, based on at least one of the weight value or the number value of the objects to be weighed in each of the storage chambers 31, 31, ... Calculated by the weight value calculating means 42, 42 ,. A combination that is close to or equal to at least one is selected by the combination selection means 43, and the objects to be weighed in all the storage chambers included in the selected combination are discharged by the discharge control means 44, 44 ,. In the storage room, a new object to be weighed is supplied to the supply control means 45,
It is stored by 45, ....

<One Embodiment of the Present Invention> (FIGS. 2 to 6) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a schematic diagram showing the overall configuration of the mechanical portion of the combination weighing device of one embodiment of the present invention, and FIG. 3 is a block diagram showing the overall configuration of the control device.

In FIG. 2, reference numeral 51 denotes a circular feeder 5 for sequentially measuring objects to be weighed.
It is a feeder to supply to 2. The peripheral portion below the circular feeder 52, eight intermediate hopper 54 _-1 to 54 _-8 are arranged in a circle, the objects to be weighed are sequentially supplied through the feeder 53 _-1 to 53 _-8.

Below the intermediate hoppers 54 _{-1 to} 54 _-8 , weighing hoppers 57 _{-1 to} 57 _-8 are installed, respectively.
Two storage chambers 58 _{-1 to} 58 _-8 , 59 _{-1 to} 59 are provided in each of the 7 _{-1 to} 57 _-8 so as to be partitioned at the center.
_-8 is provided. The objects to be weighed stored in the intermediate hoppers 54 _{-1 to} 54 _-8 are the discharge gates 55 _{-1 to} 55 _-8 , 56 _-1.
~ 56 _-8 open, storage rooms 58 _-1 ~ 58 _-8 , 5 respectively
It is dropped and stored in 9 _{-1 to} 59 _-8 .

Each of the weighing hoppers 57 _{-1 to} 57 _-8 has a weighing device 60 _-1.
.About.60 _-8 are provided, and the weight of any one of the two storage chambers can be detected by one weighing device.

Below the weighing hoppers 57 _{-1 to} 57 _-8 , the collecting chute 6 is provided.
3 are installed. The objects to be weighed stored in the respective weighing hoppers 57 _{-1 to} 58 _-8 are respectively discharged from the discharge gates 61 _{-1 to} 61.
_-8 , 62 _{-1 to} 62 _-8 are opened and they fall to the collecting chute 63.

A packaging machine 65 is installed below the collecting chute 63. At the bottom of the collecting chute 63, a timing hopper 64 that opens at regular intervals is provided.

Next, the control device of this combination weighing device will be described. FIG. 3 is a schematic diagram showing the control device 100.

In the figure, the weighing signals from the weighing devices 60 _{-1 to} 60 _-8 are the weighing value calculation circuits 110 _{-1 to} 110 of the control device 100.
_-8 will be sent. In the weighing value calculation circuit 110 _-1 110 _-8, weighing hoppers 57 _-1 to 57 each accommodating chamber 58 _{-8 -1} -58
_-8 , 59 _{-1 to} 59 _-8 to calculate the weight value of the objects to be weighed.

Here, the weighing value calculation circuit 110 _-1 is configured, for example, as shown in FIG.

In the figure, the weighing value signal from the meter 60 _-1, the first and second subtracter 111 _-1 is input to 112 _-1. First
In the subtractor 111 _-1 , the stored value stored in the correction value storage 113 _-1 is subtracted from the input weighing value signal.

The output of the first subtractor 111 _{-1 is} the output of the third subtractor 114 _-1.
Has been entered in. In the third subtractor 114 _-1 , the output of the adder 120 _-1 is subtracted from the input value. The output of the adder 120 _-1 is also input to the second subtractor 112 _-1 , and the subtractor 112 _-1 uses the weight value signal from the scaler 60 _-1 to add the adder 120 _-1 . The 120 ₋₁ output is subtracted, and the result of this subtraction is stored and set in the arithmetic storage unit 113 ₋₁ via the switch 122 ₋₁ .

The output of the third subtractor 114 ₋₁ is the switches 116 ₋₁ , 11
It is stored in the weight storage devices 118 _-1 , 119 _-1 via 7 _-1 .

The weight storage devices 118 _-1 , 119 _-1 store the weight values of the objects to be weighed corresponding to the storage chambers 58 _-1 , 59 _-1 of the weighing hopper 57 _-1. When discharged (that is, when discharge signals C _-1 and D _-1 which will be described later are input), the stored contents are reset accordingly and the apparatus power is turned off.
Even if it is done, the stored content is retained.

Both weight storages 118 _-1 , 119 _-1 both storage values are added by the adder 120 _-1 , and the second and third subtractors 11 are added.
It is output to the combination selection circuit 130 as well as being output to 2 ₋₁ and 114 ₋₁ .

Further, the switch 116 _-1 is a switch which is supplied with the object to be weighed into the storage chamber 58 _-1 and is turned on by a weighing timing signal A _-1 from a discharge supply control circuit 150 _-1 which will be described later and indicates the timing of the weighing. is there. Similarly, switch 11
_{Reference numeral} 7 _-1 is a switch which is turned on by a weighing timing signal B _-1 indicating that the object to be weighed is supplied to the storage chamber 59 _-1 and the measurement is completed.

The switch 122 _-1 is opened / closed by a memory setting signal P _{-1 which} will be described later. The switch 122 _-1 is turned on when the memory setting signal P _-1 is at "H" level and turned off when it is at "L" level.

It should be noted that other weighing value calculation circuits 110 _{-1 to} 110 _-8 are configured and provided for each weighing device in exactly the same manner as described above.

The combination selection circuit 130, as shown in FIG. 3, the weight storage 118 _-1 to weighing value operation circuit 110 _-1 110 _-8
118 _-8 119 _-1 ～119 _-8 based on the stored weight values, and a combination weighing unit 130a to the combined weight of the objects to be weighed, calculated on all combinations of different weight setting unit for storing setting weight 130b and the combination weight output of the combination calculation unit 130a and the set weight output of the weight setting unit 130b are compared to determine the optimum combination, and the combination selection signal S _-1
.About.S- ₁₆ (pulse signal of "H" level) is output.

Incidentally, the combination calculation unit 130a, performs a combination calculation based on the weight value of the weight storage unit that is a combination enable signal is "H" level from the exhaust supply control circuit 150 _-1 150 _-8 described later There is.

Exhaust supply control circuit 150 _-1 150 _-8 receives the combined sorting signals, each of the storage chambers 58 _-1 to 58 _-8, 59 _-1 to
Open the designated discharge gate of 59 _-8 to discharge the objects to be weighed, then close the discharge gate and open the discharge gate of the intermediate hopper to the discharged weighing hopper to correspond to the discharged intermediate hopper. Drive the feeder.

FIG. 5 is a block diagram showing the discharge supply control circuit 150 _-1 , and FIG. 7 is a timing chart showing its operation.

Hereinafter, a configuration and an operation example of the discharge supply control circuit 150 _-1 will be described with reference to FIGS. 5 and 7.

In FIG. 5, the combination selection signals S _-1 and S _-2 from the combination selection circuit 130 are sent to the discharge timer circuits TM1 _-1 and TM2 _-1 corresponding to the left and right storage chambers 58 _-1 and 59 _-1 , respectively. Input (a), (b).

The discharge timer circuits TM1 _-1 , TM2 _-1 are composed of a multivibrator, etc., and when the pulse signals of the combination selection signals S _-1 , S _-2 are input at time t ₀ (Fig. 7), the pulse rises. Then, the "H" level signal is output for a fixed time T ₁ (that is, the time for the object to be weighed to be completely discharged from the storage chamber) (c), (d). The output (c) of the discharge timer circuit TM1 _-1 resets the stored contents of the weight storage 118 _-1 of the measured value calculation circuit 110 _-1 as the discharge signal C _{-1 and} also causes the storage chamber 58 _-1 side to store it. The discharge gate 61 _-1 is opened and closed.

Similarly, the output of the discharge timer circuit TM2 _-1 (d) are
As the discharge signal D _-1 , the stored contents of the weight storage unit 119 _-1 of the weighing value calculation circuit 110 _-1 is reset, and
To open and close the discharge gate 62 _-1 of the housing chamber 59 _-1 side.

Output (c) of the discharge timer circuits TM1 _-1 , TM2 _-1 ,
(D) is input to the timing control circuit TM3 _-1 via the OR circuits 174 _-1 , 175 _-1 (c '),
(D ').

The timing control circuit TM3 ₋₁ is the OR circuit 174 ₋₁ , 1
When the output of 75 _{-1 falls} (t _{1 in} FIG. 7), the supply request signals (e) and (f) are sent to the intermediate timer circuit TM 4 _-1.
Send to.

Intermediate timer circuit TM4 _-1 is supply request signal (e),
When (f) is received, "H" level is output for a fixed time T ₂ (that is, time for the object to be weighed to be completely discharged from the intermediate hopper) from its rising (g), (h).

The output of the intermediate timer circuit TM4 _-1 is weighing hopper 5
Intermediate hopper 54 corresponding to 7 _-1 storage chambers 58 _-1 , 59 _-1
-1 is a signal output for opening and closing the discharge gates 55 _-1 , 56 _-1 .

However, as shown in FIG. 7, the supply request signal (e),
When (f) is input at the same time, one side (in this case, the left side storage chamber 58 _-1 ) is given priority to output the "H" level signal (g), and the other side output is output for a predetermined time T ₄ After that (at ₃ o'clock in FIG. 7), it is set to the “H” level (h).

The output of the intermediate timer circuit TM4 _-1 is input to the feeder timer circuit TM5 _-1 .

Feeder timer circuit TM5 _-1 is falling (at FIG. 7 t _2, t _4:00) of the input pulse a predetermined time T ₃ from _(i.e., substantially predetermined amount of objects to be weighed, the time for supplying the intermediate hopper ) Only outputs the "H" level signal, and the feeder 53 _-1
Is driven (i).

The output of the intermediate timer _{TM4 -1 (g), (h} )
Is also input to the timing control circuit TM3 _-1,
The timing control circuit TM3 _-1, the intermediate timer circuit T
M4 ₋₁ output (g), (h) rises for a fixed time T ₄
(That is, the time until the object to be weighed is dropped and stored in the weighing hopper until the measured value signal becomes stable) (t _{3 in} FIG. 7,
and it outputs the instantaneous "H" level pulse signal to t at _{5) (j), (k} ).

This pulse is used as the measurement timing signals A _-1 , B _-1 ,
It is sent to the measurement value calculation circuit 110 _-1 .

Further, the timing control circuit TM3 _-1 synchronizes with the metering timing signals A _-1 and B _-1 (at t ₃ o'clock, t _{3 in} FIG. 7).
₅ o'clock), the combination permission signal (l) rising to the “H” level,
(M) is output, and this combination permission signal (l),
(M) is sent to the combination selection circuit 130 (not shown).

Further, the outputs (g) and (h) of the intermediate timer circuit TM4 _-1
At the trailing edge (at t ₂ and t _{4 in} FIG. 7), the supply request signals (e) and (f) are reset to the “L” level, and the OR circuits 174 ₋₁ and 175 ₋₁ are reset. If the output rises to the "H" level (at FIG. 7 _{t 0),} the combination enable signal (l),
(M) is reset.

Incidentally, the intermediate timer TM4 _-1 from the feeder timer circuit TM5 _-1 in FIG. 5, inhibition signal for preventing the actuation of the intermediate timer circuit TM4 _-1 (n) is sent during the operation of the feeder 53 _-1 .

The input terminal of the discharge timer circuit TM1 _-1, TM2 _-1 on the output side of the OR circuit 174 _-1, 175 _-1 other side of the is connected to a storage setting circuit 200 _-1, which will be described later.

The memory setting circuits 200 _-1 to 200 _-8 are the weight value calculation circuit 1
By sending the memory setting signals P _{-1 to} P _-8 to 10 _{-1 to} 110 _-8 , the zero _{value of} each of the measuring instruments 60 _{-1 to} 60 _-8 is sent to the correction value storages 113 _{-1 to} 113 _-8. correction value is needed store established, also to prohibit the supply of the objects to be weighed to the weighing hopper 57 _-1 to 57 _-8.

The memory setting circuit 200 _-1 is configured, for example, as shown in FIG.

In the figure, 210 _-1 is, when the device power is turned on,
The zero point correction value is initialized in the correction value storage 113 _-1 of the weighing value calculation circuit 110 _-1 , and a zero point is set every time a predetermined time elapses without supplying or discharging the object to be weighed to the weighing hopper 57 _-1 . It is a first zero tracking request unit that resets the correction value (zero tracking).

First zero tracking request unit 210 _-1 includes an oscillator 211 _-1 for outputting a pulse of a predetermined period when, by counting the pulses from the oscillator 211 _-1, the counting result reaches a predetermined number,
That is, when the predetermined time (for example, 6 minutes) has elapsed, the counter 212 _-1 , which outputs an "H" level pulse, and the device power supply are turned on.
Power supply timer TM7 that outputs a pulse of a predetermined width when N
_-1, the counter 212 _-1 output and power supply timer TM7 an OR circuit 213 _-1 taking the logical sum of the _-1 output, weighing timing signal A _-1 from the exhaust supply control circuit 0.99 _-1, B _-1 and counter 212 _-1 ORs the output, the OR circuit 214 to reset the counter 212 _-1 by the output
_It consists of _-1 .

220 _-1 is the measuring instrument 60 since the last zero tracking
_-1 Resets a new zero point correction value when the ambient temperature deviation exceeds a predetermined value, a predetermined time elapses, or the object to be weighed is discharged from the weighing hopper 57 _{-1 a} predetermined number of times or more. It is a second zero tracking request unit.

In the second zero tracking request unit 220 _-1 , 221
_-1 is a temperature sensor for detecting the ambient temperature of the measuring instrument 60 _-1 ,
222 _-1 is a subtracter for subtracting the stored value stored in the temperature storage unit 223 _-1 from the temperature value from the temperature sensor 221 _-1.

The temperature memory 223 _-1 stores the temperature value from the temperature sensor 221 _-1 input via the switch 224 _-1 .

225 _-1 is a predetermined reference temperature value (for example, 0.5 ° C)
And the reference temperature value from the temperature setter 226 _-1 stored in
The subtractor 222 _-1 output is compared, and when the subtractor 222 _-1 output is greater than or equal to the reference temperature value, an "H" level signal,
It is a comparator that outputs an "L" level signal when the temperature is lower than the reference temperature value.

TM8 _-1 is a zero set timer that outputs an "L" level signal for a predetermined time (for example, 6 minutes) after a pulse signal is input, and then outputs an "H" level signal. When the next pulse signal is input during the operation of the timer, the zero set timer TM8 _-1 continues for a predetermined time (6
It is a retrigger type timer that outputs an "H" level signal after a lapse of minutes.

Further, 227 _-1, the discharge signal C _-1 from the exhaust supply control circuit 150 _-1 is input via the OR circuit 228 _-1,
This is a discharge counter that counts D ₋₁ and outputs this count value.

229 _-1, the count value from the discharge counter 227 _-1, compared previously predetermined reference frequency value (e.g., 10 times) and the reference frequency value from the number setting unit 230 _-1 is set, the discharge counter 227 _The comparator outputs an "H" level signal when the count value from _-1 is greater than or equal to the reference count value, and outputs an "L" level signal when the count value is less than the reference count value.

The "H" level output of both comparators 225 _-1 , 229 _-1 is passed through the OR circuit 231 _-1 to the zero set timer TM8.
_-1 is input, the switch 224 _-1 is turned on, and the discharge counter 227 _-1 is reset.

Further, both the comparators 225 _-1, 229 outputs _-1 and zero set timer TM8 _-1 is OR circuit 232 _-1 through, flip-flops of the delay-type D input is fixed to "H" level FF7 _- is input to the _first clock terminal, its output Q is input to one input terminal of the aND circuit 233 _-1.

The AND circuit 233 _-1 other input terminal of the combination selection signal from the combination selection circuit 130 S _-1, and S _-2 is input, the AND circuit 233 _-1 output OR circuit 234 _-1
Is input to one of the input terminals.

The output of the OR circuit 234 _-1, the discharge timer circuit TM1
_-1 , the time constant T _{1 of} TM2 _-1 , and the time T ₅ from the discharge of the object to be weighed from the weighing hopper 57 _-1 to the stabilization of the count value signal (T ₁ + T ₅ ) is input to the delivery delay timer TM9 _-1 with constant _{T 6.} This output is ejected supply controller via the OR circuit 235 _-1 150
_-1 OR circuit 174 _-1 , 175 _-1 to a memory setting timer TM10 _-1 which outputs an "H" level pulse having a very small pulse width from the falling edge of the input pulse while being connected to one input terminal It has been entered.

The output of the memory setting timer TM10 _-1 is the OR circuit 23.
It is entered in 6 _-1 .

The OR circuit 236 _-1 includes the first zero tracking request unit 2
The output of the OR circuit 213 _-1 of 10 _-1 is also input, and the output of the OR circuit 236 _-1 is output to the weighing value calculation circuit 110 _-1 as a memory setting signal P _{-1 and also} as a reset signal. , The reset terminal of the flip-flop FF7 ₋₁ and the OR circuit 231 ₋₁ .

Further, in FIG. 6, 240 _-1 is a supply prohibition unit for prohibiting the supply of the object to be weighed from the intermediate hopper 54 _-1 .

The NOR circuit 241 _-1 and the AND circuit 242 _-1 of the supply prohibiting unit 240 _-1 are supplied with the combination permission signals (l) and (m) from the discharge supply control circuit 150 _-1 .

The output of the NOR circuit 241 _-1 is input to one input terminal of the AND circuit 243 _-1, the AND circuit 243 _-1
The output of is connected to the other input terminal of the aforementioned OR circuit 234 _-1.

The third input terminal of the AND circuit 242 _-1, the second zero tracking request unit 220 _-1 of the flip-flop FF7 _-1
Output Q is input, also to the fourth input terminal, the Prohibition switch 244 _-1 is connected.

Supply-protect switch 244 _-1, and ON (closed)
"L" level, and outputs the OFF (the open) "H" level to the AND circuit 242 _-1.

The output of the AND circuit 242 _-1 is input to the clock terminal of the delay type flip-flop FF8 _-1 whose D input is fixed at the "H" level.
The output Q of _-1 is the OR circuit 235 _-1 as the supply prohibition signal.
Is input to the other input terminal of the AND circuit 2 and
It is also input to the other input terminal of 35 _-1 .

Therefore, when the apparatus power is turned ON, the storage setting signal P _-1 by the power timer TM7 _-1 of the first zero tracking request unit 210 _-1 is outputted to the weighing value operation circuit 110 _-1, the correction value storage 113 _-1 is initialized, and when the temperature difference, elapsed time, or discharge circuit from this initialization exceeds the reference value (0.5 ° C, 6 minutes, 10 times, respectively), the flip-flop FF7 _-1 output is " It becomes H "level.

In this state, when the two combination selection signals S _-1 and S _-2 are input at the same time, the supply delay timer TM9 _-1 operates, and after this operation, the memory setting signal P _-1 is output.

When the output Q of the flip-flop FF7 _-1 is at "H" level and the supply prohibition switch 224 _-1 is OFF (open), both the combination permission signals (l) and (m) are "H". if level, the flip-flop FF8 _-1 output Q is set to "H" level, the intermediate timer circuit TM4 _-1 emission supply control circuit 150 _-1 is combined enable signal (l), the (m) Both do not operate until the level becomes "L" (that is, until all the objects to be weighed stored in the storage chambers 58 _-1 , 59 _-1 are discharged).

Incidentally, the combination enable signal (l), (m) when changes to "H" level, the flip-flop FF8 _-1 with delivery delay timer TM9 _-1 is output stored setting signal P _-1 operating
Will be reset.

In addition, the memory setting circuit 200 _-1 has a memory setting signal P _-1.
The output value of the temperature memory 223 _-1 is updated and the discharge counter 227 _-1 is reset each time is output.

If the object to be weighed is not discharged from the weighing hopper 57 _{-1 for} a predetermined time (6 minutes), the first zero tracking request unit 21
0 _-1 causes the memory setting signal P _-1 to change to the weighing value calculation circuit 11
It will be output to 0 _-1 .

It should be noted that this combination weighing device is based on the above-mentioned weighing value calculation circuit 1
10 ₋₁ , the discharge supply control circuit 150 _−1, and the memory setting circuit 200 ₋₁ are identical to each other for each of the weighing devices 60 _{−1 to} 60 _−8.
It is configured to be provided in pairs.

<Operation of the Embodiment> (FIGS. 7-9) Next, the operation of the embodiment will be described with reference to the time charts of FIGS. 7-9.

In advance, all the storage chambers 58 _{-1 to} 58 _-8 , 59 _-1 to all the intermediate hoppers 54 _{-1 to} 54 _-8 and the weighing hoppers 57 _{-1 to} 57 _-8.
The object to be weighed is accommodated in 59 _-8 , and the weight storages 118 _{-1 to} 11 of the weight value calculation circuits 110 _{-1 to} 110 _-8 are stored.
It is assumed that each weight value is stored in 8 _-8 , 119 _{-1 to} 119 _-8 .

The supply prohibition switch 244 _-1 ～244 _-8 memory setting circuit 200 _-1 200 _-8 to ON (closed) state.

(Initial setting of zero correction value) When the power supply of the device is turned on, the memory setting control circuit 200
_-1 200 _-8 power timer TM7 _-1 to Tm _-8 is operated, the storage setting signal P _-1 to P _-8 weighing value from the first zero tracking request unit 210 _-1 to 210 _-8 Arithmetic circuit 110 _-1
~ 110 _-8 , the correction value storage 113 _-1 ~
113 _-8, from the weighing value signal from the meter 60 _-1 to 60 _-8, weight memory 118 _-1 to 118 _-8 119 _-1 to 11
A value obtained by subtracting the added weight of 9 _-8 (that is, a zero point correction value) is initialized.

On the other hand, the stored weight values of the weight value calculation circuits 110 _{-1 to} 110 _-8 are sent to the combination weighing unit 130 a of the combination selection circuit 130.

(Combination Selection Operation) The combination calculation unit 130a calculates the combination weight for all different combinations based on the weight value of the storage chamber in which the combination permission signal is at the “H” level. Discrimination unit 1
At 30c, the optimum combination weight close to or equal to the set weight set in the weight setting unit 130b is determined, and as a result, the combination selection signal corresponding to each combination-selected storage chamber is output as the discharge supply control circuit 150 _-1. To 150 _-8 .

Here, for example, storage room 58 _-1 weighing hoppers 57 _-1, 5
The objects to be weighed stored in 9 _-1 (each weight memory value is W
_LO and W _RO ) are simultaneously selected for combination selection,
As shown in the time chart of FIG. 7, at t ₀ , the combination selection signals S ₋₁ and S ₋₂ are input to both the discharge timer circuits TM1 ₋₁ and TM2 ₋₁ (FIG. 7 (a),
(B)).

(Discharge supply operation) When a combination selection signal is input, both discharge timer circuits TM
1 ₋₁ and TM2 ₋₁ both operate, and FIG. 7 (c),
As shown in (d), the output is at the “H” level for T ₁ time from t ₀ time. This output is the discharge signal C _-1 , D _-1.
Is sent as.

As a result, both discharge gates 6 of the weighing hopper 57 _-1 are
1 _-1 , 62 _-1 is opened for T ₁ hour, the objects to be weighed stored in the storage chambers 58 _-1 , 59 _-1 are discharged, and the collecting chute 63 is discharged together with the objects to be weighed discharged from the other weighing hoppers. It is accommodated in the timing hopper 64 through the above and is discharged to the packaging machine 65 at a predetermined timing.

At this time, the weight storage 11 of the weighing value calculation circuit 110 _-1
8 ₋₁ and 119 ₋₁ are reset.

When T ₁ time elapses from t ₀ o'clock, the timing control circuit T
Supply request signals (e) and (f) from M3 _-1 are both input to the intermediate timer circuit TM4 _-1 .

(Measuring operation in the left side storage chamber) As a result, the intermediate timer circuit TM4 _-1 becomes the OR circuit 1
Since the outputs (c ′) and (d ′) of 74 ₋₁ , 175 ₋₁ have fallen from t _{1 for} T ₂ hours since t ₁ , the left discharge gate 55 ₋₁ of the intermediate hopper 54 ₋₁ is output. Is opened, and the objects to be weighed are stored in the left side storage chamber 58 _-1 of the weighing hopper 57 _-1 .

Then, at the time t ₂ after the time T _{2 has} elapsed, the intermediate timer circuit TM4 _-1
When the output is changed to "L" level, the feeder timer circuit TM5 _-1 is activated (i), the feeder 53 _-1 is driven, the intermediate hopper 5 new objects to be weighed from the feeder 53 _-1
4 _-1 and the supply request signal (e) is reset.

_{t 3} times have elapsed _{T 4} hours at t _1, with a combination enable signal (l) is sent to combination selection circuit 130, the weighing timing signal A _-1 weighing value operation circuit 110 _-1
And the switch 116 _-1 is turned on.

As a result, the sufficiently stable weighing value signal W _T1 from the weighing machine 60 _-1 is input to the first subtractor 111 _-1 of the weighing value calculation circuit 110 _-1 , and the zero-point correction value initialized is set. _WH0 is subtracted, and the addition value (“0” in this case) of the stored values of the weight storage units 118 ₋₁ and 119 ₋₁ is further subtracted in the third subtractor 114 ₋₁ , and this subtraction result (W _T1- W _H0 = W
_L1 ) is stored in the weight storage device 118 _-1 .

By the above, the weighing of the objects to be weighed supplied to the left side storage chamber 58 _-1 is completed, and this weight value W _L1 is determined by the combination selection circuit 13
Sent to 0.

(Measurement operation in the right housing chamber) at _{t 3} metering is completed on the left housing chamber 58 _-1, the output of the intermediate timer circuit TM4 _-1 (h) becomes _{T 2} hours "H" level from the time _{t 3,} the output By the intermediate hopper 5
4 right discharge gate 56 _{-1 -1} is opened, the objects to be weighed are accommodated in the right side accommodating chamber 59 _-1 weighing hoppers 57 _-1.

Then, when the intermediate timer circuit TM4 _-1 returns to the "L" level T ₂ hours after t ₃ o'clock, the feeder timer circuit TM5 _-1
Is operated, and the object to be weighed is supplied from the feeder 53 _-1 to the intermediate hopper 54 _-1 (i).

Also, _{t 3} at intermediate timer circuit TM4 _-1 from "H" to become a level _{T 4} hours elapsed _{t 5} times, weighing timing signal B with a combination enable signal (m) is sent to combination selection circuit 130 _{- 1} is the weighing value calculation circuit 130 _-1
The switch 117 _{-1 of} is turned on.

As a result, the zero-point correction value W _H0 is subtracted from the sufficiently stable weight value signal W _T2 from the weighing device 60 _-1 , and the total value of the stored values of both weight storage devices 118 _-1 , 119 _-1 (this In this case, “W _L1 ”) is subtracted, and the result of the subtraction is the weight value W _R1 (= W _T2 −W _H0 −) of the object to be weighed in the right side storage chamber 59 ₋₁ .
It is stored in the weight storage device 119 _-1 as W _L1 ).

Similarly, the weight value of the object is sequentially calculated based on the value obtained by subtracting the zero point correction value W _H0 from the weight value signal W _T ,
Combinations are selected and discharged.

Incidentally, for the other weighing hopper 57 _-2 to 57 _-8, similar measurement operation is performed.

(Zero tracking operation) When such a metering operation is continued, for example, the second zero tracking request unit 22 of the memory setting circuit 200 _-1
At 0 _-1 , the temperature deviation from the initial setting of the zero correction value, the elapsed time, or the number of discharges is the reference value (0.5 ° C, 6
After 10 minutes, the output Q of the flip-flop FF7 _-1 becomes "H" level.

In this case, Figure 8 of the time chart shown as _{t 6} o'clock combination enable signal (l), (m) and are both "H" supplied prohibition level state switch 244 _-1 is OFF (opened), Flip-flop FF of the supply prohibition unit 240 _-1
Since the 8 _-1 output Q is set to the "H" level, the OR circuits 174 _-1 , 175 _-1 outputs of the discharge supply control circuit 150 _-1 are held at the "H" level (c '), (d '), the supply of the objects to be weighed from an intermediate hopper 54 _-1 is prohibited.

When the objects to be weighed in the left storage chamber 58 _-1 are selected in combination while the supply is prohibited and the combination selection signal S _-1 is input at t ₇ (a), the discharge timer circuit TM _{1 -1} operates for T ₁ time. and (c), the objects to be weighed which are housed in the left storage chamber 58 _-1 is discharged.

At this time (t ₇ o'clock), the combination permission signal (l) is
It is reset to "L" level.

Next, the objects to be weighed in the right side storage chamber 58 _-1 are selected in combination,
When combined selection signal S _-2 at t ₈ is input (b), the discharge timer circuit TM2 _-1 is actuated _{T 2} hours (d), the objects to be weighed of the right housing chamber 59 _-1 is discharged .

At this time (t ₈ o'clock), the combination permission signal (m) is reset to the “L” level, so that the supply prohibition unit 240 _−1.
The output of the AND circuit 243 _-1 becomes "H" level, and the supply delay timer TM9 _-1 operates for T ₆ time.

Therefore, the OR circuit 17 of the discharge supply control circuit 150 _-1
The output of 4 ₋₁ , 175 ₋₁ is T continuously from t ₈ o'clock.
_The level becomes “H” level for ₆ hours, and becomes “L” level at t ₃ when t ₆ hours have passed from t ₈ hours (c ′), (d ′).

The output Q of the flip-flop FF8 _-1, the delivery delay timer TM9 _-1 is reset when activated "L"
Return to the level.

Delivery delay timer TM9 _-1 after the end of the operation (at FIG. 8 _{t 9)}
The storage setting signal P _-1 is sent to the weighing value calculation circuit 110 _-1, and the stable weighing value signal of the empty weighing hopper 57 _-1 is calculated and stored as a new zero correction value W _H1 via the switch 122 _-1. The weight is stored in the storage unit 113 _-1 (at this time, the storage values of the weight storage units 118 _-1 , 119 _-1 are both "0").

Further, at time t _{10 when} T ₄ hours have elapsed after the output (g) of the intermediate timer circuit TM4 _-1 has risen, the timing control circuit TM3 _-1 outputs the measurement timing signal A _-1 (j), and the measured value. The switch 116 _-1 of the arithmetic circuit 110 _-1 is turned on.

Therefore, the adder 120 is added to the value obtained by subtracting the zero-point correction value W _H1 newly stored at t ₇ from the stable weight value signal W _{T3 of the} object to be weighed stored in the left side storage chamber 58 _{-1.
The -1} output ("0" in this case) is subtracted, and the subtraction result (that is, W _T3 -W _H1 = W _L2 ) is the weight storage device 118 _-1 as the weight value of the object to be weighed stored in the left storage chamber. Memorized in.

Further, at t ₁₀ , the output (h) on the other side of the intermediate timer circuit TM4 _-1 rises to the "H" level, so that a new object to be weighed is transferred from the intermediate hopper 54 _-1 to the left storage chamber 59 _-1. It is stored.

starting at t _10, sometimes t ₁₁ has passed further _{T 4} hours, the same way, the timing control circuit TM4 weighing timing signal B _-1 from _-1 weighing value operation circuit 110 _-1 Switch 11
In order to turn on 7 ₋₁ , the weight memory 119 ₋₁ stores the zero point correction value W _H1 and the adder 120 in the weight value signal W _T4.
-1 value obtained by subtracting the output W _L2 (that is, W _T4 -W _H1 -W _L2 = W
_R2) is stored as the weight value of the objects to be weighed which have been accommodated in the right side accommodating chamber 59 _-1.

When the objects to be weighed in both storage chambers 58 _-1 , 59 _-1 are selected in combination at the same time, the O of the supply prohibition switch 244 _-1 is selected.
Regardless of N or OFF, the supply delay timer TM9 _-1 operates via the AND circuit 233 _-1 of the memory setting circuit 200 _-1 , and the zero tracking operation is performed as described above.

In the same manner, each time there is an object to be weighed in both storage chambers 58 _-1 , 59 _-1 with the temperature difference, the elapsed time, or the discharge count from the previous setting of the zero correction value exceeding the reference value. In addition, the measurement calculation is performed while the zero tracking operation is performed.

In addition, such a zero tracking operation is performed by another weighing device 6
The same applies to 0 _{-2 to} 60 _-8 .

Also, during such a weighing operation, for example, the weighing hopper 57
If a predetermined time (6 minutes) elapses without the combination of the measured objects stored in _-1 being selected, the output of the counter 212 _{-1 of} the first zero tracking request unit 210 _-1 is "H". The level is set, and the memory setting signal P _-1 is sent to the weighing value calculation circuit 110 _-1 .

Therefore, in the weight value calculation circuit _110-1 , the output (W _L2 + W _R2 ) of the adder 120 _-1 is subtracted from the weight value signal W _T5 at this time, and the result (W _T5 −W _L2 −W _R2 ) is obtained. A new zero point correction value W _H2 is stored and set in the correction value storage 113 _-1 , and the zero tracking operation in the state where the object to be weighed is stored is performed every predetermined time (6 minutes).

<Other Embodiments of the Present Invention> In the above embodiment, the objects to be weighed were combined and selected based on their weight values, but not only the weight values but also the weight values were calculated. Combinations may be selected based on individual numerical values.

In this case, it can be easily realized by providing a unit for converting the weight value into the number value and a number setting unit for storing and setting the set number instead of the weight setting unit 130b of the combination selection circuit 130.

In the above embodiment, the second zero tracking request unit 2
20 _-1 of the flip-flop FF7 _-1 output Q is "H" level, the combination enable signal (l), had be prohibited the objects to be weighed supplied when the (m) are both "H" level, This is not limited to the above embodiment, and, for example, either of the combination permission signals (l) and (m) may be "H" level, and the flip-flop FF7.
Instead of _-1 , a manual switch may be used to activate the supply prohibition.

Further, it goes without saying that the control device 100 of the above embodiment is not limited to the circuit configuration of the above embodiment,
The configuration of a microcomputer having an equivalent operation program does not depart from the gist of the present invention.

<Effects of the Present Invention> As described above, the combination weighing device of the present invention inhibits the supply of the object to be weighed until the weighing hopper becomes empty and performs the zero tracking operation. Without stopping the operation, it is possible to easily and frequently reset the zero-point correction value in response to drift of the weighing machine or adhesion of dust on the object to be weighed. There is an advantage that does not decrease.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention, FIG. 2 is a schematic diagram of a mechanical portion of the present invention, FIG. 3 is a block diagram showing a control device, and FIGS. 4, 5, and 6 are 3 is a block diagram showing a main part of FIG. 3, and FIG. 7 is a time chart showing an operation example of FIG. FIG. 8 is a diagram showing a part of a timing chart of the zero tracking operation. FIG. 9 is a schematic configuration diagram showing a conventional combination weighing device, and FIG. 10 is a block diagram showing a main part of FIG. 53 _{-1 to} 53 _-8 ... feeder, 54 _{-1 to} 54 _-8 ... intermediate hopper, 57 _{-1 to} 57 _-8 ... weighing hopper, 58 _{-1 to} 58
_-8 , 59 _{-1 to} 59 _-8 ... storage room, 60 _{-1 to} 60 _-8 ... measuring instrument, 110 _{-1 to} 110 _-8 ... weighing value calculation circuit, 113
_{-1 to} 113 _-8 ... correction value storage device, 118 _{-1 to} 118 _-8 ,
119 _{-1 to} 119 _-8 ... weight storage device, 130 ... combination selection circuit, 150 _{-1 to} 150 _-8 ... discharge supply control circuit,
200 _-1 to 200 _-8 ... Memory setting circuit, 210 _{-1 to} 21
0 _-8 ... first zero tracking request unit, 220 _{-1 to} 22
0 _-8 ...... Second zero tracking request unit, 240 _{-1 to} 24
0 _-8 ... supply prohibition unit, TM1 _{-1 to} TM1 _-8 ... discharge timer circuit, TM2 _{-1 to} TM2 _-8 ... discharge timer circuit, TM
3 _{-1 to} TM3 _-8 ... Timing control circuit, TM4 _{-1 to} T
M4 _-8 ...... intermediate timer circuit, TM5 _-1 ~TM5 _-8 ...... feeder timer circuit, TM9 _-1 ~TM9 _-8 ...... delivery delay timer.

Claims (1)

[Claims] 1. A plurality of supply means for supplying an object to be weighed and a plurality of storage chambers for accommodating the objects to be weighed from the plurality of supply means in sequence and having independent discharge means and integrally connected to each other. A plurality of weighing hoppers owned, a plurality of weighing means provided for each of the plurality of weighing hoppers for weighing the object to be weighed stored in the weighing hoppers, and weighing values from the plurality of weighing means. At least one of the weight value or the number value of the objects to be weighed stored in each storage chamber owned by the plurality of weighing hoppers, which is calculated based on the signal, is combined to be close to or equal to the set weight or the set number. A combination weighing device comprising a control device for selecting a combination and discharging the objects to be weighed of the selected combination from the storage chamber, wherein the control device stores a zero point correction value for each of the plurality of weighing means. Compound Correction value storage means, and based on the value obtained by subtracting the zero correction value stored in advance in the correction value storage means from the measurement value signals from the plurality of measurement means, A plurality of weight value calculating means for calculating at least one of the weight value or the number value of the objects to be weighed stored in any one of them, and at least one of the plurality of weight values or the number value calculated by the plurality of weight value calculating means Based on the above, combination selection means for selecting a combination that is close to or equal to at least one of the set weight and the set number, and all the combinations included in the combinations selected by the combination selection means by controlling the plurality of discharging means. A plurality of discharge control means for discharging the objects to be weighed in the storage chamber, and a storage chamber in which the objects to be weighed are discharged by the plurality of discharge control means by controlling the plurality of supply means. A plurality of supply control means for supplying the objects to be weighed, and the supply means by the corresponding supply control means until the objects to be weighed stored in all the storage chambers of the weighing hopper are discharged. The plurality of supply prohibition means for prohibiting the supply of the objects to be weighed and the objects to be weighed stored in all the storage chambers of the weighing hoppers to which the supplies of the objects to be weighed are prohibited by the supply prohibition means are discharged. And a plurality of zero tracking control means for storing and setting a new zero point correction value in the correction value storage means corresponding to the weighing hopper.