JPH0627664B2 - 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. 10 to 11) 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 it is possible to increase the accuracy of the combination weight or the number of combinations, the combination weighing device as shown in FIG. 10, for example, 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. 11 shows the 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 the objects to be weighed are stored in the weighing hopper 4 _-1 from the intermediate hopper 2 _-1 while both weighing hoppers 4 _-1 , 4 _-2 are empty, the weighing value signal from the weighing instrument 10 _{-1 is} output. , 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. The weighing object is discharged by manual operation or the like, and the switch 1 of each weighing value calculating means 12
4 _{-1 to} 14 _-n are turned on to reset the zero point correction value for each measuring instrument 10 _-1 to 10 _-n (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 comprising a large amount of water as pickles, etc., in the case of weighing objects to be weighed which easily adheres to the weighing hoppers, for example, a pair of weighing hoppers _4-1, the objects to be weighed which have been accommodated in 4 _-2 combination Even though both discharge gates 6 _-1 , 6 _-2 have been selected and opened, some of the objects to be weighed may remain on the weighing hopper _4-2 side.

If a new object to be weighed to the weighing hopper 4 _-1-side in this state is accommodated, and weight values of the remaining residue the objects to be weighed to the weighing hopper 4 _-2 side, was actually stored in the weighing hopper 4 _-1 The total value together with the weight value of the object to be weighed is stored in the weight storage unit 17 _-1 of the weighing calculation unit 12 _-1 .

Moreover, once the residual value error is included in the stored value of the weight storage device 17 _-1 in this way, both weighing hoppers 4 _-1 , 4 _-2 will be discharged even if this residual object to be weighed is discharged. Until it is completely emptied, the weight values stored in the weight storage units 17 _-1 , 18 _-1 will always include an error due to this residual amount, and a weighing error will constantly occur. I will end up.

Further, if the zero tracking operation is performed in the presence of the residual weighing object, even if the residual weighing object is discharged after this zero tracking operation, the zero point including the weight of the residual weighing object is maintained until the next zero tracking operation. Since the measurement calculation is performed based on the correction value, a measurement error will occur.

Therefore, there has been a problem in that it is not possible to accurately weigh an object to be weighed, which is particularly persistent.

<Purpose of the present invention> The present invention has been made in view of the above problems, and is capable of performing a zero tracking operation by finely responding to a drift of a measuring instrument, a stationary residue of an object to be weighed, and the like. It is an object of the present invention to provide a combination weighing device in which the operation rate of the device is less likely to decrease due to the operation, and an object to be weighed having residual properties can be weighed with high accuracy.

<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, ..., And correction value storage means 41a, 41a, ..
.. and weighing means 34, 34 for storing the weighing value signals from the weighing means 34, 34, ... Immediately before the objects to be weighed are supplied from 3, 33 ,.
.. from the measured value signals from the correction value storage means 41a, 4
Based on the value obtained by subtracting the zero correction value stored in 1a, ..., At least one of the weight value or the number value of the objects to be weighed stored in the weighing hoppers 32, 32 ,. Calculation mode (hereinafter referred to as zero tracking calculation mode) and a value obtained by subtracting the weight value stored immediately before the object to be weighed stored in the weight value storage means from the weight value signals from the weighing means 34, 34, .... Based on the
2, a weighing value computing means 4 having a second computing mode (hereinafter referred to as deviation measurement computing mode) for computing at least one of the weight value and the number value of the objects to be weighed stored in.
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 35, 35, ... Designed independently 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 33, 33 ,.
... and supply control means 45, 45 for supplying a new object to be weighed to the storage chamber 31, in which the object to be weighed has been discharged by the discharge control means, and a measured value calculation means 42,
The calculation mode switching means 46, 46, ... for switching the first and second calculation modes of 42, ... and the measurement value calculation means 42, 42, ... perform the measurement calculation in the first calculation mode. At this time, the correction value storage means 41a, 41a ...
Zero tracking control means 47, 47 for storing and setting a new zero point correction value, and weighing value calculation means 42, 4
Each time the objects to be weighed are stored in the weighing hoppers 32, 32, ... When the weighing units 2, 2, ... Are performing the weighing operation in the second operation mode, the weighing means 34, 34 ,.
The measured value signal from the measured value storage means 41b, 41b ...
The deviation measurement control means 48, 48, ...

<Operation> Therefore, when the calculation value switching means 46, 46, ... Is performing the weighting calculation in the first calculation mode (zero tracking calculation mode) by the measurement value calculating means 42, 42 ,. Control means 47, 47,
The new zero point correction value is sequentially stored and set in the correction value storage means 41a, 41a ,.
At least one of the weight value and the number value of the objects to be weighed stored in 1, 31, ... Is calculated.

Further, when the weighing value computing means 42, 42, ... Are performing the weighing computation in the second computing mode (deviation measurement computing mode) by the computation mode switching means 46, 46 ,. , 48, ... Each time the object to be weighed is stored in the weighing hoppers 32, 32 ,.
The weighing value signals from the weighing means 34, 34, ... Immediately before storage are stored and set in the weighing value storage means 41b, 41b ,.
From the measured value signal from the measured value storage means 41b, 41b,
Based on the value obtained by subtracting the stored value of ……, each storage room 31, 3
At least one of the weight value and the number value of the objects to be weighed stored in 1, ... Is calculated.

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 and 58 _{-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. The subtractor 111 _-1 subtracts the stored value stored and set in the calculation storage 113 _-1 from the input weighing value signal.

The output of the subtractor 111 _-1 is input to the third subtractor 114 _-1 . In the third subtractor 114 _-1 , the adder 120
The output of _-1 is subtracted from the input value. Also, this adder 1
20 output of _-1, the are also input to the second subtractor 112 _-1, the subtracter 112 _-1, the metric signals from meter 60 _-1, the adder 120 _-1 output Subtraction is performed, and the result of the subtraction is stored in the arithmetic storage unit 1 via the switch 122 _-1.
It is stored and set at 13 _-1 .

The outputs of the first subtractor 111 _-1 and the third subtractor 114 _-1 are selected by the switch 115 _-1 , and the switches 116 _-1 , 1
It is stored in the weight storage devices 118 _-1 , 119 _-1 via 17 _-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.

Changeover switches 115 _-1 is controlled by an output obtained by inverting the mode switching signal Y _-1, which will be described later by the inverter 121 _-1, when the inverter 121 _-1 output is "L" level, the first subtractor It is connected to the output side of 111 _−1, and is connected to the output side of the third subtractor 114 ₋₁ when the output of the inverter 121 ₋₁ is “H” level.

Further, the opening and closing of the switch 122 _-1 is performed by the AND circuit 123 _-1.
And the output of the AND circuit 123 _-1 is "H".
Turns on when the level is set and turns off when the level is "L".
The output of the inverter 121 _-1 is input to one input terminal of the AND circuit 123 _-1 , and the storage setting signal P _-1 described later is input to the other input terminal.

The switch 124 _-1 is turned on when the output of the AND circuit 125 _-1 is at the "H" level to store the weighing value signal from the weighing machine 60 _-1 in the arithmetic memory 113 _-1 .
The mode switching signal Y _-1 is input to one input terminal of the AND circuit 125 _-1 , and the memory setting signal P _-1 is input to the other input terminal.

Therefore, when the mode switching signal Y _-1 is at "L" level, the switch 115 _-1 is connected to the output side of the third subtractor 114 _-1 and the switch is switched for each input of the memory setting signal P _-1. 122 _-1 is turned on, and the output of the second subtractor 112 _-1 is stored in the arithmetic memory 113 _-1 (zero tracking arithmetic mode).

Further, when the mode switching signal Y _-1 is at "H" level, the switch 115 _-1 is connected to the output side of the first subtractor 114 _-1 and is switched for each input of the memory setting signal P _-1. 124 _-1 is turned on, and the measured value signal from the measuring instrument 60 _-1 is stored (deviation measurement calculation mode).

As will be described later, when the mode switching signal Y _-1 is at "L" level, the memory setting signal P _-1 is stored in both storage chambers 58 _-1 , 59 _-1 of the weighing hopper 57 _-1 . either when metered objects to be weighed are simultaneously discharged, or if it is not exhausted a predetermined time only (including at power oN) "H" level, and therefore, the operation storage unit 113 _-1, zero-point correction value Will be stored and set.

When the mode switching signal Y _-1 is at the "H" level, the memory setting signal P _-1 indicates that the object to be weighed is discharged from the weighing hopper 57 _-1 (that is, the next object to be weighed is stored). since the each "H" level immediately above), the arithmetic memory unit 113 _-1,
The weighing value signal from the weighing device 60 _-1 immediately before storing the object to be weighed is stored and set every time the object to be weighed is discharged.

It should be noted that other weighing value calculation circuits 110 _{-2 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. 2, 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 device 118 _-1 of the weighing value calculation circuit 110 _-1 as a discharge signal C _-1 and discharges the storage chamber 58 _-1 side. Open and close the gate 61 _-1 .

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
When it falls (7th t ₂ o'clock, t ₄ o'clock), the supply request signals (e) and (f) are reset to the “L” level, and the outputs of the OR circuits 174 ₋₁ and 175 ₋₁ are output. "H" stand climb when the 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 the arithmetic and control circuit 200 _-1, which will be described later.

The calculation control circuits 200 _-1 to 200 _-8 are the measurement value calculation circuit 1
By sending a 10 _-1 to 110 _-8 mode switching signal Y _-1 to Y _-8, and stores the setting signal P _-1 to P _-8, operation mode of the weighing value operation circuit 110 _-1 110 _-8 (That is, zero tracking calculation mode or deviation measurement calculation mode)
And the arithmetic storage units 113 _{-1 to} 113
_-8 , the zero correction value for each of the measuring instruments 60 _{-1 to} 60 _-8, or
The weight value signal immediately before storing the object to be weighed is stored and established at any time.

The arithmetic control 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 operation storage 113 _-1 to zero-point correction value of the metric calculation circuit 110 _-1 is initialized, also supply and zero-point correction for each of the discharge has passed a predetermined time without being made of the objects to be weighed against the weighing hopper 57 _-1 It is a first zero tracking request unit that resets a 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 _{- 1} is input to the clock terminal, and its output Q is input to one input terminal of the AND circuit 233 _-1 and the OR circuit 234 _-1 .

The other input terminal of the AND circuit 233 _-1 is connected to the output of the AND circuit 235 _-1 which receives the combination selection signal from the combination selection circuit 130 as an input.
_{The -1} output is input to one of the input terminals of the OR circuits 236 _-1 , 237 _-1 . Further, the mode switching signal Y _-1 from the operation mode switching switch 250 _-1 is input to the other input terminal of the OR circuit 234 _-1 .

The other input terminal of the OR circuit 236 _-1, the AND circuit 238 _-1 which receives the combination sort signal S _-1 and mode switching signal Y _-1 corresponding to the left housing chamber 58 _-1 from combination selection circuit 130 output is connected to the other input terminal of the OR circuit 237 _-1, the aND circuit 239 _-1 which receives the combination sort signal S _-2 and mode switching signal Y _-1 corresponding to right storage chamber 59 _-1 The output of is connected.

The outputs of the OR circuits 236 _-1 , 237 _-1 are the time constant T _{1 of the} discharge timer circuits TM1 _-1 , TM2 _-1 and the weighing hopper 57.
Approximately the sum of the time _{T 5} since objects to be weighed are discharged to the count value signal is stable from _{-1 (T} 1 + T ₅₎ when the supply delay timer TM9 _-1 with constant _{T 6,} TM10 _-1 Have been entered respectively. This output is connected to one input terminal of each of the OR circuits 174 _-1 , 175 _-1 of the discharge supply control device 150 _{-1 and has} a very low pulse width from the falling edge of the input pulse. It is input to the memory setting timers TM11 _-1 , TM12 _-1 that output pulses.

The outputs of the memory setting timers TM11 _-1 , TM12 _-1 are
It is input to the OR circuit 242 _-1.

The OR circuit 242 _-1 is first zero tracking request section 2
The output of the OR circuit 213 _-1 of 10 _-1 is also input, and the output of the OR circuit 242 _-1 is output to the weighing value calculation circuit 110 _-1 as a memory setting signal P _{-1 and also} as a reset signal. , Is input to the reset terminal of the flip-flop FF7 _-1 and the OR circuit 231 _-1 via the OR circuit 243 _-1 .

The output of the AND circuit 241 _-1 is input to the OR circuit 242 _-1 .

The AND circuit 241 _-1, the AND circuit 240 having an input to AND circuit 235 _-1 output and mode switching signal Y _{-1 -1}
Flip-flop FF8 _-1 output Q raised by the output of
And the "H" level pulse having a small width of the simultaneous discharge timer TM13 _-1 which is activated by the trailing edge of the metering timing signal A _-1 .

The mode switching signal Y _-1 is input to the other input terminal of the OR circuit 243 _-1 .

The calculation mode switch _250-1 outputs "H" level signal when OFF, the outputs "L" level signal when the turns ON.

Therefore, when the operation mode changeover switch 250 _-1 is closed, the device power is turned ON, the storage setting signal P _-1 weighing value by the power supply timer TM7 _-1 of the first zero tracking request unit 210 _-1 The data is output to the arithmetic circuit 110 _-1 , and the arithmetic memory 113 _-1 is initialized for the zero tracking arithmetic mode.

Further, when the temperature difference from the initial setting, the elapsed time, or the number of discharges exceeds the reference value (0.5 ° C., 6 minutes, 10 times, respectively), the output of the flip-flop FF7 ₋₁ becomes “H” level, and 2 Supply delay timers TM9 _-1 , TM10 _-1 only when two combination selection signals S _-1 , S _-2 are simultaneously input.
Simultaneously operate, and after this operation, the memory setting signal P _-1 is output.

In addition, the arithmetic control 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.

In addition, the object to be weighed is not discharged from the weighing hopper 57 _{-1 for} a predetermined time (6 minutes), and the first zero tracking request unit 2
The memory setting signal P ₋₁ is changed to 10 ₋₁ by the measured value calculation circuit 1
It will be output to 10 ₋₁ .

Further, when the power is turned on with the calculation mode changeover switch 250 _-1 being opened, the "H" level mode changeover signal Y _-1 and the memory setting signal P _-1 are sent to the weighing value calculation circuit 110 _-1 . The calculation storage unit 113 _-1 is output and preset for the deviation measurement calculation mode. After this initial setting, when the combination selection signals S _-1 , S _-2 are input, the supply delay timers (TM9 _-1 , TM) corresponding to the input combination selection signals are input.
At least one of 10 _-1 ) is activated. After this operation, the memory setting signal P _-1 is output to the measurement value calculation circuit 110 _-1 , and the measurement in the deviation measurement calculation mode is started.

When the combination selection signals are simultaneously input in this deviation measurement calculation mode, the supply delay timers TM9 _-1 , TM10 _{-1 are} supplied.
After storing the setting signal P _-1 after actuation of is once output, to be output is stored setting signal P _-1 again during the fall of the weighing timing signals A _-1 from the discharge supply control circuit 150 _-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 arithmetic control 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 calculation mode selection switch 250 _-1 250 _-8 of the arithmetic and control circuit 200 _-1 200 _-8 to ON (closed) state.

(Initial setting of zero point correction value) When the power source of the device is turned on, the arithmetic control circuit 200 _-1
200 _-8 power timer TM7 _-1 to Tm _-8 is actuated,
First zero tracking request unit 210 _-1 to 210 stores setting signal P _-1 to P _-8 from _-8 weighing value operation circuit 110 _-1 to 1
Since the data is input to 10 _-8 , the arithmetic storage units 113 _{-1 to} 113
_-8 , from the weighing value signal from the weighing instrument 60 _{-1 to} 60 _-8 ,
A value (that is, a zero point correction value) obtained by subtracting the added weight of the weight storage devices 118 _{-1 to} 118 _-8 and 119 _{-1 to} 119 _-8 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 26 via the and is discharged to the packaging machine 65 at a predetermined timing. At this time, the weight storage device 11 of the weighing value calculation circuit 110 _-1 is stored.
8 ₋₁ and 119 ₋₁ are reset.

When T ₁ hour has elapsed from t hour, the timing control circuit TM
Supply request signals (e) and (f) from 3 _-1 are 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.

(Weighing operation in right storage 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 correction value W _H0 from the measured value signal W _T , and the combination is selected and discharged.

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

(Zero-tracking calculation mode) When such a metering operation is continued, for example, the second zero-tracking request unit 22 of the calculation control 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.

At this time, if both the combination selection signals (a) and (b) are input as shown in the time chart of FIG. 8 (t _{6 in} FIG. 8), the _objects to be weighed in the storage chambers 58 _-1 , 59 _-1 are measured. The objects are discharged at the same time, and the supply delay timers TM9 _-1 and TM10 _-1 are both set to T.
_{Since it} operates for ₆ hours (c '), (d'), the intermediate hopper 5
The supply of the objects to be weighed from 4 _-1 to the left storage chamber 58 _-1 is delayed (e).

After expiration of the timer operation storage setting signal P (the first 8:00 FIG t _7)
-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 changed to the new zero correction value W _H1.
Is stored and set in the arithmetic storage unit 113 _-1 via the switch 122 _-1 (at this time, the weight storage units 118 _-1 , 119).
The stored values of _-1 are both "0").

Further, at time t _{8 when} T ₄ hours have elapsed after the output (g) of the intermediate timer circuit TM 4 _-1 has risen, the timing control circuit TM 3 _-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.

Moreover, sometimes this t _8, since the other side of the intermediate timer circuit TM4 _-1 output (h) rises to "H" level, the new objects to be weighed to the left housing chamber 59 _-1 from the intermediate hopper 54 _-1 It is stored.

starting at t _8, further _{T 4} hours elapsed _{t 3} times, 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.

In the same manner, the objects to be weighed in both storage chambers 58 _-1 , 59 _-1 are discharged simultaneously when the temperature difference, the elapsed time, or the number of discharges from the previous setting of the zero correction value exceeds the reference value. Every time the measurement is performed, the weighing 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 .

During such a weighing operation, for example, when a predetermined time (6 minutes) elapses while the weighed objects stored in the weighing hopper 57 _-1 are not selected for combination, the first zero tracking request unit 210 _-1 counter 212 _-1 output is "H"
The memory setting signal P _-1 becomes the level, and the measured value calculation circuit 11
It is sent to 0 _-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 arithmetic storage unit 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).

In addition, in the initial stage of the weighing operation in which the temperature drift of the weighing instruments 60 _{-1 to} 60 _-8 is severe, the respective reference values (0.5 ° C., 6 minutes, 10
Alternatively, the zero tracking operation may be frequently performed.

(Deviation measuring operation mode) When the objects to be weighed with persistent as such pickles, OFF advance operation mode changeover switch 250 _-1 250 _-8
When the power is turned on in the (open) state, the weighing value calculation circuit 1
The mode switching signals Y _{-1 to} Y _-8 and the memory setting signals P _{-1 to} P _-8 are input to 10 _{-1 to} 110 _-8 .

Therefore, metric signals from each meter 60 _-1 to 60 _-8, via the switch 124 _-1 to 124 _-8, and stored in the calculation memory 113 _-1 to 113 _-8.

In this state, for example, as shown in FIG.
_-1 combination selection signal (a) corresponding to the left side storage chamber 58 _-1
Is input to the arithmetic control circuit 200 _-1 (t ₀ ′ in FIG. 9).
), The discharge timer circuit TM of the discharge supply control circuit 150 _-1
1 _-1 and the supply delay timer TM9 _-1 operate (c),
(C ′), the object to be weighed is discharged from the left storage chamber 58 ₋₁ ,
After elapse of T ₆ hours from the time t ₀ ′ (at time t ₁ ′ in FIG. 9)
Then, the intermediate hopper 54 _-1 is opened for T ₂ hours (g).

At this time (at time t ₁ ′ in FIG. 9), the measured value calculation circuit 110 _-1
The switch 124 _{-1 of} is turned on by the memory setting signal P _-1 .
_Therefore , the stable weighing value signal W _{1 of} the weighing hopper 57 _-1 from which the object to be weighed is discharged by the combination selection signal is stored in the arithmetic storage unit 113 _-1 .

Then, a new object to be weighed from an intermediate hopper 54 _-1 has elapsed T ₄ hours from the time t _{1 'housed} in the left storage chamber 58 _-1 t
_{At the time of 2} ′, the measurement timing signal A ₋₁ is input to the measurement value calculation circuit 110 ₋₁ in the same manner as described above, so that at this time (t ₂ ′).
The result obtained by subtracting the weighing value W ₁ stored in the arithmetic storage unit 113 ₋₁ from the weighing value signal W ₂ of the time) is the weight value (W ₂ −W _{1 of the} object to be weighed stored in the left storage chamber 58 _−1). = W _L1 ′) is stored in the weight memory 118 _-1 via the switch 116 _-1 .

When the objects to be weighed in both storage chambers 58 _-1 , 59 _-1 are discharged at the same time, immediately after the weighing of the objects to be weighed newly stored in the left storage chamber 58 _-1 is completed (that is, the ninth When the metering timing signal A _{-1 in} the figure falls, the memory setting signal P _-1 is output (the flip-flop FF8 _-1 and the simultaneous discharge timer T).
(By M13 _-1 ), the weighing value signal at this time is stored in the arithmetic storage unit 113 _-1, and the same weighing measurement as described above is performed (not shown).

Similarly, the result of subtraction between the stored weighing value immediately before the weighing object is stored in the weighing hopper 57 _-1 and the weighing signal after the storage is the weight value of the stored weighing object. The data are sequentially stored in the storage devices 118 _-1 , 119 _-1 and are sent to the combination selection circuit 130 as described above.

For example, during the metering by the deviation measuring operation mode, when a part of the objects to be weighed remaining on the left housing chamber 58 _-1 weighing hoppers 57 _-1, the weighing newly accommodated in the left housing chamber 58 _-1 The measured value signal of the object contains an error temporarily,
The measurement value signal of the object to be weighed newly stored in the right side storage chamber 59 _-1 does not include an error due to this residual amount, and after this residual amount is discharged together with other objects to be weighed, No measurement error due to the residue.

During the deviation measurement mode, the arithmetic control circuit 200 _-1
And the 200 _-8 flip-flop FF7 _-1 ~FF7 _-8 to reset state, prohibits the zero tracking operation mode.

<Other Embodiments of the Present Invention> In the above embodiment, the storage means for storing the zero point correction value and the storage means for storing the weight value signal immediately before storing the object to be weighed are the operation storage device 113 _-1. It was shared by ~ 113 _-8 , but this may be provided separately.

Further, in the above-mentioned embodiment, the objects to be weighed are combined and selected based on their weight values, but not only the weight values but also the combination values are selected based on the number values calculated based on these weight values. Good.

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.

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> Since the combination weighing device of the present invention is configured as described above, it is possible to cope with drift of a weighing instrument, standing debris of a measured object, etc. without stopping the operation of the device. Therefore, it is possible to easily and frequently reset the zero correction value, there is an advantage that the measurement error is small, and the operation rate of the apparatus does not decrease.

Further, even with respect to the weighing object having residual properties, high-accuracy weighing can be performed by switching the calculation mode, so that a wide range of weighing is possible without being limited to the type of the weighing object.

[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 timing chart showing an operation example of FIG. FIG. 8 is a diagram showing a part of the zero tracking calculation mode timing chart of FIG. 6, FIG.
The figure is a diagram showing a part of the timing chart of the deviation measurement calculation mode of FIG. FIG. 10 is a schematic configuration diagram showing a conventional combination weighing device, and FIG. 11 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 ... 60 _-8 ......
Weighing machine, 110 _{-1 to} 110 _-8 ... weighing value calculation circuit, 11
3 _{-1 to} 113 _-8 ... Operation memory, 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 ... Arithmetic control circuit, 210 _{-1 to} 21
0 _-8 ... first zero tracking request unit, 220 _{-1 to} 22
0 _-8 ... second zero tracking request unit, 250 ... calculation mode changeover switch, 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 to} TM5 _-8 ... feeder timer circuit, TM9 _{-1 to} TM9 _-8 , TM10 _-1 to
TM10 _-8 ... Supply 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 and the number value of the objects to be weighed stored in each of the storage chambers owned by the plurality of weighing hoppers, which is calculated based on the signal, is combined to be equal to or equal to the set weight or the set number. A combination weighing device comprising a controller for selecting a combination and discharging the objects to be weighed of the selected combination from the storage chamber, wherein the controller stores a zero correction value for each of the plurality of weighing means. Compound Correction value storage means, a plurality of weight value storage means for storing weight value signals from the plurality of weighing means immediately before the plurality of weighing means are supplied with the objects to be weighed from the plurality of supply means, The object to be weighed stored in any of the plurality of storage chambers based on a value obtained by subtracting the zero correction value stored in advance in the correction value storage means from the measurement value signal from the measurement means. From the plurality of weighing means after the object to be weighed is stored in any of the plurality of storage chambers owned by the plurality of weighing hoppers. The measured value signal stored in any one of the plurality of storage chambers based on a value obtained by subtracting the measured value immediately before storing the measured object stored in advance in the measured value storage means from the measured value signal Of the weight value or piece value At least one of a plurality of weight value calculation means having a second calculation mode for calculating one and a plurality of weight values or number values calculated by the plurality of weight value calculation means; Combination selection means for selecting a combination that is close to or equal to at least one of the set numbers and the objects to be weighed in all the storage chambers included in the combinations selected by the combination selection means by controlling the plurality of discharge means. A plurality of discharge control means for discharging the plurality of supply means, and a plurality of supply control means for controlling the plurality of supply means to supply a new object to be weighed to the storage chamber in which the object to be weighed is discharged by the plurality of discharge control means. A plurality of calculation mode switching means for switching the first calculation mode and the second calculation mode of the plurality of weight value calculation means; and a plurality of weight value calculation means. When performing the measurement calculation in the first calculation mode, a plurality of zero tracking control means for storing and setting new zero point correction values in the plurality of correction value storage means, and a plurality of the measurement value calculation means When the weighing calculation is performed in the calculation mode, the weighing value signals from the weighing means immediately before the storage are stored in the weighing value storage means every time the objects to be weighed are stored in the weighing hoppers. A combination weighing device, comprising: a plurality of deviation measurement control means for storing and setting in a memory.