JPH1183607A - Combination weighing equipment and filling equipment of articles which is provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable combination weighing excellent in precision, in the case of articles to be weighed whose adhesion is high. SOLUTION: In this combination weighing equipment, articles are measured with a plurality of meters 2, combination of the measured values is operated, and the articles are discharged from a meter 2 wherein the combination measured value is in an allowable range. Supply feeders 4, a feeder control means 15, a sampling means 16 and a supply stopping means 17 are installed in the equipment. The supply feeders 4 supply articles to the meters 2. The feeder control means controls intermittently the operation of the supply feeders 4, at a cycle independent of the combination operation cycle. The sampling means 16 takes in the measured values from the meter 2 corresponding to the feeder 4 at the time of interruption. The supply stopping means 17 maintains the stopping state of a corresponding supply feeder 4 via the feeder control means 15, when a taken-in measured value exceeds a reference value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combination weighing apparatus and method for weighing articles with a plurality of weighing instruments, calculating the weighed values in combination, and discharging the articles from the weighing instruments having a combined weight value within an allowable range. And an article filling device provided with the combination weighing device.

[0002]

2. Description of the Related Art In this kind of combination weighing, if an article to be weighed is highly adherent, a pool hopper for putting the article into a weighing hopper is omitted in consideration of ease of cleaning. In many cases, articles are directly input from a plurality of supply feeders to corresponding weighing hoppers. As shown in FIG. 8, the combination weighing apparatus of this type supplies the articles to the weighing hopper by vibrating the supply feeder for a predetermined time ta in an intermediate section before and after the calculation timing for combining and calculating the weighing values of the weighing hoppers. As shown in FIG. 9,
In an intermediate section before and after the calculation timing, there is a type in which the supply feeder is vibrated (hereinafter, referred to as a B method) for a time tb until an article having a constant weight is supplied to the weighing hopper without limiting the time. In the B method, the weighing value by the weighing hopper is constantly monitored, and the supply by the vibration is continued until the weighing value reaches a certain weight.

[0003]

However, in the combination type weighing apparatus of the A type, since the vibration time of the supply feeder and the amount of supply thereof are not exactly proportional from the beginning, articles fed from the supply feeder to the weighing hopper are not necessarily proportional. Since the supply amount is not stable and the supply operation is performed only once after the combination operation is completed, even if the input amount is small, additional supply cannot be performed until the next combination operation is completed. When such a weighing hopper with a small input amount occurs, the number of weighing hoppers to participate in the combination calculation is reduced, so that there is a problem that the weighing accuracy is reduced accordingly.

Further, in the combination weighing apparatus of the B type, there is no occurrence of a weighing hopper in which the input amount is small. However, when articles having high adhesiveness are to be weighed, articles of a constant weight are put into the weighing hopper. Even if the supply is stopped at that point, the articles attached to the tip of the supply feeder may fall into the weighing hopper and the input amount may become excessive, resulting in an unstable supply of the articles to the weighing hopper. There is.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a combination weighing apparatus and a method thereof capable of accurately weighing even highly adherent articles, and an article filling apparatus provided with the same.

[0006]

In order to achieve the above object, a combination weighing device according to claim 1 of the present invention weighs an article with a plurality of weighing instruments, performs a combined operation of the weighed values,
An article is ejected from a weighing instrument having a combined weight value within an allowable range, and a supply feeder for supplying articles to the weighing instrument, and intermittently operating the supply feeder in a cycle independent of the combination calculation cycle. A feeder control means for causing the supply feeder to stop, a sampling means for taking in a weighing value from a weighing device corresponding thereto when the supply feeder is stopped, and a corresponding weighing value exceeding the reference value via the feeder control means. A supply stopping means for maintaining a stopped state of the supply feeder.

According to the combination weighing apparatus, the supply of the articles to the weighing device by the supply feeder is performed intermittently in a cycle independent of the cycle of the combination calculation, and the weighing of the weighing device in which the supply of the articles is stopped is performed. Since the combination weighing is performed on the value, it is possible to prevent the articles from unexpectedly dropping on the weighing hopper after the weighing by the weighing hopper, and it is possible to accurately perform the combination weighing even on highly adherent articles.

According to a second aspect of the present invention, there is provided a combination weighing apparatus according to the first aspect, wherein the supply feeder is a vibratory feeder, and the feeder control means controls a vibration time of the vibratory feeder. It is.

According to the combination weighing device, the feed time of the vibrating feeder is controlled by the feeder control means, thereby facilitating the control of the amount of articles supplied to the weighing device.

[0010] Further, an article filling apparatus according to claim 3 of the present invention comprises: a combination weighing apparatus having the structure of claim 1 or 2;
A transfer device for feeding a container storing articles discharged from the combination weighing device to a filling position below the weighing device, and trigger means for starting the combination calculation cycle when the container comes to the filling position. It is a thing.

According to the article filling apparatus described above, highly adherent articles can be accurately measured and filled into the containers sequentially fed by the transfer apparatus.

According to a fourth aspect of the present invention, there is provided a combination weighing method, wherein articles are weighed by a plurality of weighing devices, and the weighed values are combined and calculated. A method of intermittently supplying articles to the weighing device in a cycle independent of the combination calculation cycle, and taking in weighing values from the corresponding weighing device when the supply is stopped, When the weighed value exceeds the reference value, the supply of articles to the corresponding weighing machine is stopped.

According to the combination weighing method, as in the case of the weighing device of the first aspect, it is possible to accurately perform combination weighing even on highly adherent articles.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an article filling device provided with a combination weighing device according to an embodiment of the present invention. The combination weighing device 1 weighs the articles M with a plurality of weighing devices 2 (2 ₁ to 2 _n ), calculates the weighed values in combination, and weighs the weighing devices 2 whose combination weight value is within an allowable range including the combination target value. Is a device for discharging an article M from The combination weighing apparatus 1 has an upper feeding hopper 3 more supply feeders distributed supply divided into a plurality of rows of articles M that are dropped from 4 (4 ₁ to 4 _n), the lower end of each feed feeder 4 the weighing hoppers 5 (5 ₁ ~5 _n) are respectively provided for receiving the articles M supplied thereto from these feeders. In this example, the weighing hopper 5 has upper and lower ends open, and a partition wall 5 at the center in the vertical direction.
0 and a cylindrical body having both ends open. Each of the supply feeders 4 includes an upstream vibration feeder 4 a near the input hopper 3 and a downstream vibration feeder 4 b near the weighing hopper 5.

As shown in FIG. 2, n supply feeders 4
₁ to 4 _n is arranged parallel to, and transported while vibrating the articles M fed by gravity from a single said hopper 3, arranged in a straight line along the lower end of the supply feeder 4 ₁ to 4 _n The measured hoppers 5 _{1 to} 5 _n are supplied. The weighing hopper 5 in FIG.
A weight detector 6 for detecting the weight of the weighing hopper 5 and a discharge driving device 7 for rotating the weighing hopper 5 up and down by 180 ° to discharge the articles M stored therein are provided. A weighing device _2i is configured. Below the weighing hopper 5, there is provided a collecting and discharging chute 8 for collecting and discharging the articles M supplied from the weighing hopper 5 downward.

As shown in FIG. 3, below the collecting and discharging chute 8, there is provided a transfer device for feeding a container 9 containing articles M discharged from the discharging port 8a to a filling position P below the discharging port 8a. , A conveyor 10 is provided.
In the vicinity of the filling position P, as shown in FIG. 1, a container detector 11 such as a photoelectric converter for detecting the container 9 that has reached this position is provided. In addition, as shown in FIG. 4, in the vicinity of the filling position P, a positioning wheel for intermittently rotating the container 9 sent from the upstream of the conveyor 10 to sequentially position the container 9 at the filling position P, and stop during the filling time. 12 are provided.

Reference numeral 13 in FIG. 1 denotes a control device composed of, for example, a computer, which controls the overall operation of the device for filling the article M. This control device 13 is a combination operation means 1
4, feeder control means 15, sampling and storage means 1
6 and supply stopping means 17. Combination operation means 1
Reference numeral 4 denotes a combination weigher of the articles M to be weighed by the plurality of weighing devices 2, and operates the discharge driving device 7 of the weighing device 2 in which the combined weight value is within an allowable range including the target value, thereby weighing the weighing hopper 5.
Means for discharging the article M from

The container detecting means 11 functions as trigger means for starting the combination calculation cycle by the combination calculation means 14. That is, the combination calculation cycle by the combination calculation unit 14 is started with the detection signal of the container detection unit 11 as a trigger.

As shown in FIG. 5, the feeder control means 15 intermittently operates the supply feeder 4 in a cycle independent of the cycle of the combination calculation by the combination calculation means 14.
Is a means for controlling the operation of. The sampling storage unit 16 in FIG. 1 is a unit that, when the supply feeder 4 is stopped, fetches a measured value from the corresponding measuring device 2. The supply stopping means 17 is a means for maintaining the stopped state of the corresponding supply feeder 4 via the feeder control means 15 when the measured value taken in by the sampling storage means 16 exceeds the reference value w _0. .

FIG. 6 shows an arbitrary measuring device 2 _i (i = 1, 2, 2).
, N, the same applies hereinafter). FIG. 7 is a flowchart showing the entire weighing operation of the combination weighing apparatus 1. The operation of the combination weighing device 1 of FIG. 1 will be described below with reference to FIGS.

In the control device 13 shown in FIG.
4₁~ 4_nStart flag FF_iIs on
Is determined by the feeder control means 15 (step in FIG. 6).
S1), start flag FF_iIs turned on.
Ida 4_iIs driven for a constant drive time t1 (step S1).
2) When the fixed drive time t1 elapses, the same supply fee
Da 4_iTo the next fixed stop time t2 Stop only
Step S3). Immediately before the end of the fixed stop time t2, the sun
The storage means 16 for the pulling is stored in the supply feeder 4. _iCompatible with
Measuring instrument 2_iWeighing value w_iIs read, and this weighing value w
_iIs stored (step S4).

Next, the storage means 16 of the sampling, metering value w _i do of whether preset reference value w ₀ value greater than judgment read (step S5), and the reference value w ₀
If smaller, the operations of steps S2 to S5 are repeated. Such control supply feeder 4 _i intermittently in the corresponding meter to 2 _i metric w _i of exceeds the reference value w _0, wiggling cycle independent from the combination calculation cycle by the combination calculation means 14 Works.

If the weighing value w _i of the weighing device 2 _i becomes equal to or more than the reference value w _{0 in} step S5, the storage means 16 for sampling turns on the corresponding weight stability flag A _i (step S6). . Thereby, the weighing value w _i of the weighing device 2 _i can participate in the combination calculation by the combination calculation means 14. Then, the sampling of the storage unit 16 turns off the start flag FF _i of the corresponding supply feeders 4 _i (step S7). Accordingly, the corresponding supply feeder 4 _i is not activated until the article M of the corresponding weighing device 2 _i is discharged by the combination operation of the combination operation means 14. That is, as shown in FIG.
In addition, an additional stop time t3 of an indefinite length until the article M is discharged is added, and the stop state is maintained. Step S1~S7 are performed for each meter 2 ₁ to 2 _n.

[0024] Out of the meter 2 ₁ to 2 _n, in some state of the meter 2 _i to the reference value w ₀ or more by weight of the article M is accommodated, the container coming transported resting conveyor 10 When the container detector 11 detects that has reached the filling position P below the outlet 8a of the collective discharge chute 8 (step N1 in FIG. 7), the combination calculating means 14 uses the detection signal as a trigger signal and Check the on-off of the flag a ₁ to a _n (step N2), reads out the weight value w _i of the measuring instrument 2 _i corresponding to a weight stability flag a _i are turned on from the sampling of the storage unit 16 (step N
3), the combination calculation in a plurality of weighing values w _i read (step N4).

Next, the combination calculating means 14 determines whether or not there is a combination of values within the allowable range including the target value among the several weight values obtained by the combination calculation (step N).
5). The allowable range in this case is, for example, the target value w of the combination.
It is set as a range from _T to a slightly larger upper limit. In step N5, when a combination of the allowable range is present, the combination calculation means 14 discharges the articles M from one or more measuring instruments 2 _i constituting the combinations (step N6).

Next, the combination calculating means 14 ejects the article M.
Measuring device 2_iWeight stability flag A_iTurn off and vs
Corresponding supply feeder 4_iStart flag FF_iTurn on
(Step N7). Thereby, the weight stability flag A_i
Measuring instrument 2 turned off_iCannot participate in combinational operations
Start flag FF_iFeeder 4 turned on _i
Becomes drivable.

In step N5, when there is no combination within the allowable range, the combination calculating means 14 starts the activation flag FF _i of the supply feeder 4 _i corresponding to the measuring device 2 _i whose weighing value w _i is, for example, w _T / 4 or less. Is turned on (step N8),
To perform additional supply by driving the supply feeder 4 _i. Thereafter, the processing of steps N1 to N5 is repeated. As a result, a new combination operation is performed.

The articles M discharged from the collecting / discharging chute 8 by the combination weighing are filled in the container 9 at the filling position P, and then transferred to the downstream side.

As described above, in the combination weighing device 1,
The supply of the articles M to the weighing device 2 by the supply feeder 4 is performed finely and intermittently in a cycle independent of the cycle of the combination operation, and the supply of the articles M is stopped.
Since the combination calculation is performed only for the weighing value of, the combination M can be accurately weighed even for the article M having high adhesiveness without the supply of the article M to the measuring instrument being over-quantified or being insufficiently supplied.

[0030]

As described above, according to the present invention, articles M are intermittently supplied to the weighing device in a cycle independent of the cycle of the combination operation, and the weighing device corresponding to this is supplied when the supply is stopped. When the weighed value exceeds the reference value, the article M is transferred to the corresponding weighing device.
Is maintained, the supply of the article M to the weighing machine is performed intermittently and finely in a cycle independent of the cycle of the combination operation, and the weighing of the weighing instrument in which the supply of the article M is stopped is performed. Combination weighing is performed on the value, so that even the highly adherent article M can be accurately combined and weighed.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a device for filling an article M provided with a combination weighing device according to an embodiment of the present invention.

FIG. 2 is a plan view of the filling device.

FIG. 3 is a front view showing a main part of the filling device.

FIG. 4 is a plan view showing a part of the filling device.

FIG. 5 is a timing chart showing a weighing operation of the combination weighing device.

FIG. 6 is a flowchart showing a weighing operation of each weighing device of the combination weighing device.

FIG. 7 is a flowchart showing an overall weighing operation of the combination weighing device.

FIG. 8 is a timing chart showing a conventional weighing operation.

FIG. 9 is a timing chart showing a weighing operation of another conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Combination weighing device, 2 ... Measuring device, 4 ... Supply feeder, 8a ... Discharge port, 9 ... Container, 10 ... Conveyor (transfer device), 11 ... Container detector (trigger means), 14 ... Combination calculation means, 15 ... feeder control means, 16 ... sampling storage means, 17 ... supply stop means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B65G 47/14 101 B65G 47/14 101C

Claims (4)

[Claims] 1. A combination weighing device for weighing an article with a plurality of weighing instruments, calculating the weighed values in combination, and discharging the articles from the weighing instruments having a combined weight value within an allowable range. A supply feeder for supplying articles; feeder control means for intermittently operating the supply feeder in a cycle independent of the combination calculation cycle; and sampling for taking in a weighing value from a corresponding measuring device when the supply feeder is stopped. A combination weighing apparatus comprising: means; and a supply stop means for maintaining a stop state of a corresponding supply feeder via the feeder control means when the taken weighing value exceeds a reference value. 2. The combination weighing device according to claim 1, wherein the supply feeder is a vibration feeder, and the feeder control unit controls a vibration time of the vibration feeder. 3. The combination weighing device according to claim 1 or 2, a transfer device for feeding a container storing articles discharged from the combination weighing device to a filling position below the weighing device, and wherein the container is And a trigger means for starting the combination calculation cycle when the apparatus reaches the filling position. 4. A combination weighing method in which articles are weighed by a plurality of weighing instruments, the weighed values are combined, and the articles are discharged from the weighed articles having a combined weight value within an allowable range. The product is intermittently supplied to the weighing machine in a cycle independent of the cycle of the above, and when the supply is stopped, the weighing value is taken from the corresponding weighing device. A combination weighing method for maintaining a state in which supply of articles to a measuring instrument is stopped.