JP5281875B2 - Combination scale - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combination weighing instrument which is capable of simultaneously manufacturing articles having different weights and which is easy to maintain its combination accuracy. <P>SOLUTION: An operation controlling section 8 of a combination weighing instrument 100, based on the weight of an object M held in each weighing hopper 4, which is acquired from a weighing section 5, selects a combination of weighing hoppers 4 holding the objects M as a first group such that the total weight of the objects M is within a predetermined range from a first targeted weight. From among the weighing hoppers 4 other than the first group, a combination of weighing hoppers 4 holding the objects M is selected as a second group such that the total weight of the objects M is different from the first targeted weight and is within a predetermined range. A gate 4a of each weighing hopper 4 belonging to the fist group is opened to discharge the object M to one discharging route 6a from among discharging routes 6a, 6b, and a gate 4b of each weighing hopper 4 belonging to the second group is opened to discharge the object M to other discharging route 6b which is different from one discharging route 6a. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a combination weigher that combines subdivided objects to be weighed and discharges them as a predetermined weight object.

  The combination weigher is used when a certain weight of product is packed in a bag. For example, when trying to pack 100 grams of biscuits, biscuits divided into about 25 grams are supplied to a plurality of weighing hoppers. In the weighing hopper, the exact weight of the biscuit that each holds is weighed. Then, based on the accurately weighed weight value, a combination of biscuits whose total weight falls within a predetermined range from 100 grams is found, and when such a combination is found, those biscuits are discharged. This is the basic principle of the combination weigher. A target weight such as the above 100 grams is called a “target weight”, and an operation for finding a combination as described above is called a “combination operation”.

  Here, the products are not necessarily packaged with the same internal capacity, and may be packaged in 50 grams to make a product, or may be packaged in 100 grams to make a product. If these plural products are manufactured in order, it is possible to deal with a single combination weigher. On the other hand, when producing 50 grams of goods and 100 grams of goods simultaneously for reasons such as manufacturing management, two or more combination weighers must be prepared. However, when two combination weighers are installed, it is necessary to secure a wide installation place, and there may be a problem that the cost increases.

Therefore, conventionally, a combination weigher has been proposed in which the whole is divided into two left and right parts, each acting as if it were an independent combination weigher (see, for example, Patent Document 1). According to such a configuration, a combination calculation of 50 grams can be performed in the right part of the combination weigher, and a combination calculation of 100 grams can be performed in the left part at the same time. That is, it is possible to simultaneously manufacture products having different weights while suppressing the installation area.
JP-A 63-184019

Depending on the target product, in general, it can be selected to maintain the combination accuracy (the error between the target weight and the actual weight of the object being weighed is within an acceptable range). It is said that 210 or more combinations need to be secured. For example, in the case of a combination weigher having 14 weighing hoppers, if 6 weighing hoppers are selected by a combination calculation, there are ₁₄ C ₆ = 3003 combinations, and sufficient combination accuracy can be maintained. On the other hand, according to the conventional combination weigher which is divided into the left and right parts described above, even if the entire combination weigher has 14 weighing hoppers, the combination calculation is actually performed with 7 weighing hoppers. become. In this case, if six weighing hoppers are selected from the seven weighing hoppers, there are only ₇ C ₆ = 7 combinations, and the combination accuracy cannot be maintained. Thus, in the conventional combination weigher described above, there are cases where combination accuracy cannot be maintained at a relatively high rate.
Therefore, in view of the above problems, an object of the present invention is to provide a combination weigher that can simultaneously manufacture products having different weights and that can easily maintain the combination accuracy.

In order to solve the above-described problems, a combination weigher according to the present invention includes a plurality of weighing hoppers that hold an object to be weighed by closing an openable / closable gate provided at the bottom, and a weight of the object to be weighed held by the weighing hopper. A weighing unit for weighing the weighing object, at least two discharge paths to which the weighing hopper's gate is opened and a discharge destination of the object to be weighed, A calculation control unit that performs opening / closing control of the gate of the weighing hopper, wherein the calculation control unit has a total weight of the first target weight based on the weight of the weighing object held by each weighing hopper acquired from the weighing unit. The combination of the weighing hoppers that hold the objects to be weighed within a predetermined range is selected as a first group, and the total weight of the weighing hoppers other than the first group is the first target weight. Different 2. Select a combination of weighing hoppers that hold the objects to be weighed within a predetermined range from the target weight, and set these as the second group, open the gate of the weighing hopper belonging to the first group, and The object to be weighed is discharged to one of the discharge paths, the gate of the weighing hopper belonging to the second group is opened, and the object to be weighed is discharged to another discharge path different from the one discharge path. According to such a configuration, even when performing a combination calculation for the second target weight, a large number of selectable combinations can be ensured, so that a combination scale that can maintain the combination accuracy relatively easily can be obtained. .
The combination weigher may further include a linear feeder that vibrates the weighing object supplied to the weighing hopper by vibrating, and the calculation control unit includes the first target weight and the second target weight. The weight of the linear feeder is determined so that the weight to be weighed is approximately equal to or equal to a fraction of the weight difference. You may make it vibrate. According to this configuration, a combination of objects to be weighed whose total weight becomes the first target weight or the second target weight is easily established, and stable combination accuracy can be maintained.
Further, in the combination weigher, the calculation control unit includes a weight that is substantially equal to a weight difference between the first target weight and the second target weight, and a weight that is approximately equal to an integer of the weight difference. When the object to be weighed is supplied to the weighing hopper, both the number of combinations that can be selected when selecting the first group and the number of combinations that can be selected when selecting the second group are It is desirable to determine a weight secured above a certain level as the supply weight. According to such a configuration, a larger number of selectable combinations can be ensured, and more stable combination accuracy can be maintained.

  The combination weigher includes an input unit for inputting a target weight, and when the at least two different target weights are input to the input unit, the arithmetic control unit is configured to input the target input to the input unit. It is preferable that the weight is acquired, and the smaller target weight is set as the first target weight, and the larger target weight is set as the second target weight. According to such a configuration, a large number of selectable combinations can be ensured particularly in the combination calculation for the second target weight, and both the combination calculation for the first target weight and the combination calculation for the second target weight are performed. A certain combination accuracy can be maintained.

  In the combination weigher, the calculation control unit may open the gates of the weighing hoppers belonging to the first group and the gates of the weighing hoppers belonging to the second group at different time intervals. According to such a configuration, a different number of products can be manufactured for each internal capacity.

  According to the present invention, it is possible to provide a combination weigher that can simultaneously manufacture products having different weights and that can easily maintain the combination accuracy.

  Embodiments according to the present invention will be described below with reference to the drawings. Below, the same code | symbol is attached | subjected to the element which is the same or it corresponds through all the drawings, and the overlapping description is abbreviate | omitted.

(First embodiment)
First, the configuration of the combination weigher 100 according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a combination weigher 100 according to the present embodiment. In addition, the black circle in a figure represents the to-be-measured item M. As shown in FIG. 1, a combination weigher 100 according to this embodiment includes a main feeder 1 including a top cone 1a and a vibrator 1b, a linear feeder 2 including a feeder pan 2a and a vibrator 2b, and a supply hopper 3. The weighing hopper 4, the weighing unit 5, the collective chute 6, the input display unit 7, and the calculation control unit 8. Hereafter, each structure is demonstrated in order.

  The top cone 1a is disposed at the top of the combination weigher 100 and has a conical shape. Usually, a supply device 200 for supplying an object to be weighed is disposed above the combination weigher 100, and the portion to be weighed M is supplied from the supply device 200 to the upper surface of the top cone 1a. Since the top cone 1a has a conical shape, the objects to be weighed M supplied to the upper surface thereof are distributed in the radial direction.

  The vibrator 1b is disposed below the top cone 1a and has a function of vibrating the top cone 1a. The vibrator 1b vibrates the top cone 1a, so that the objects to be weighed M supplied to the upper surface of the top cone 1a can be evenly distributed in each direction. The vibration of the vibrator 1b is controlled by the arithmetic control unit 8.

  The feeder pan 2a has a function of receiving an object to be weighed M distributed from the top cone 1a. The feeder pan 2a is disposed around the top cone 1a and extends radially outward from the vicinity of the outer periphery of the top cone 1a. In FIG. 1, the feeder pans 2 a are shown on the left and right sides of the paper surface. The same applies to the supply hopper 3, the weighing hopper 4, and the weighing unit 5.)

  The vibrator 2b is disposed below the feeder pan 2a and has a function of vibrating the feeder pan 2a. When the vibrator 2b vibrates, the measurement object M on the feeder pan 2a can be conveyed radially outward. The vibration of the vibrator 2b is controlled by the arithmetic control unit 8, and the arithmetic control unit 8 can vibrate each of the vibrators 2b individually.

  The supply hopper 3 is arranged below (lower stage) so as to correspond to each feeder pan 2a. The supply hopper 3 has a gate 3a that can be opened and closed at the bottom, and receives the object M from the feeder pan 2a with the gate 3a closed. Normally, the supply hopper 3 opens the gate 3a and supplies the object to be weighed M to the weighing hopper 4 when the corresponding weighing hopper 4 becomes empty. Opening and closing of the gate 3 a of the supply hopper 3 is controlled by the arithmetic control unit 8.

  The weighing hopper 4 is arranged below the supply hopper 3 so as to correspond to each supply hopper 3. The weighing hopper 4 has an inner gate 4a and an outer gate 4b that can be opened and closed at the bottom, and receives the object M from the supply hopper 3 with the inner gate 4a and the outer gate 4b closed. Opening and closing of the inner gate 4a and the outer gate 4b of the weighing hopper 4 is controlled by the arithmetic control unit 8, and the arithmetic control unit 8 can individually control the inner gate 4a and the outer gate 4b.

  The weighing unit 5 is disposed inside the combination weigher 100 and has a function of weighing the weight of the object M held by the weighing hopper 4. The weighing unit 5 includes a load cell, and the weight of the object to be weighed M is calculated (measured) based on an electric signal from the load cell. In the present embodiment, the electric signal from the load cell is sent to the calculation control unit 8, and the calculation control unit 8 calculates the weight of the object to be measured M. The weight of the measurement object M is calculated inside the measurement unit 5. Then, the signal may be transmitted to the arithmetic control unit 8.

  The collective chute 6 has a function as a discharge path for collecting the objects to be weighed M discharged from the weighing hopper 4 and discharging them to the packaging machine 300 disposed below the combination weigher 100. The collecting chute 6 includes an inner chute 6a and an outer chute 6b. When the inner gate 4a of the weighing hopper 4 is opened, the object M is discharged to the inner chute 6a, and the outer gate 4b of the weighing hopper 4 is opened. When this is done, the object M is discharged to the outer chute 6b. That is, the combination weigher 100 according to the present embodiment has two discharge paths. In the packaging machine 300, the object to be weighed M discharged from the inner chute 6a and the object to be weighed M discharged from the outer chute 6b are received in separate packaging bags or the like and packaged separately.

  The input display unit 7 is an interface that connects the combination weigher 100 and an operator, and can input operating conditions of the combination weigher 100 such as a target weight, and has a function of displaying a measurement result and the like. . The input display unit 7 can exchange signals with the arithmetic control unit 8 wirelessly or by wire. Note that the input display unit 7 according to the present embodiment employs a touch panel.

  The arithmetic control unit 8 includes a CPU and the like, and has a function of controlling the vibrator 1b, the vibrator 2b, the supply hopper 3, the weighing hopper 4, and the weighing unit 5 based on the operation on the input display unit 7. doing. Further, the combination calculation is performed by the calculation control unit 8. The above is the schematic configuration of the combination weigher 100 according to the present embodiment.

  Next, with reference to FIG.2 and FIG.3, the action | operation of the combination scale 100 which concerns on this embodiment is demonstrated. FIG. 2 is a flowchart showing the operation of the combination weigher 100. This operation is performed under the control of the arithmetic control unit 8. Note that the combination weigher 100 according to the present embodiment has 14 weighing hoppers 4.

  First, the operator inputs two different target weights from the input display unit 7. Then, the arithmetic control unit 8 acquires these two target weights from the input display unit 7 (step S1). Here, it is assumed that the operator inputs 80 grams and 120 grams as target weights. Thereafter, the arithmetic control unit 8 compares the two target weights, and sets the smaller one as the first target weight and sets the larger one as the second target weight (step S2). In the above example, 80 grams is set as the first target weight, and 120 grams is set as the second target weight.

Subsequently, the arithmetic control unit 8 determines the supply weight of the object M to be supplied to the weighing hopper 4 (step S3). Specifically, the supply weight is determined to be a weight difference between the first target weight and the second target weight, or a weight that is an integer of the weight difference. However, the supply weight is determined so that 210 or more combinations can be secured. In the above example, the first target weight is 80 grams and the second target weight is 120 grams, so the weight difference is 40 grams. Here, if the supply weight is set to 40 grams, two weighing hoppers 4 are selected from 14 weighing hoppers 4 in the combination calculation for the first target weight described later. In this case, ₁₄ C ₂ = 91 combinations are selectable, and 210 or more combinations cannot be secured. On the other hand, if 20 grams, which is a half of the 40 gram difference in weight, is used as the supply weight, as will be described in detail later, the combination calculation for the first target weight and the second target weight is 210. A combination of more than the streets can be secured. Therefore, here, the supply weight is determined to be 20 grams.
Subsequently, the arithmetic control unit 8 linear feeder 2 (vibrator 2b) so as to be able to supply the weighing object M of the determined supply weight to each supply hopper 3 (and thus to each measurement hopper 4). Is vibrated (step S4). At this time, the gate 3a of the supply hopper 3 is kept closed to receive the object M to be weighed. In the above example, the arithmetic control unit 8 vibrates the linear feeder 2 so that the weighing object M of about 20 grams can be supplied to the weighing hopper 4. The strength and time when the linear feeder 2 is vibrated represent a table showing the relationship between the strength and time of vibration prepared in advance for the type of the object to be weighed M and the supply weight, or the relationship thereof. It is determined based on the calculated equation.

  Subsequently, the gate 3a of the supply hopper 3 is opened, and the object to be weighed M held by the supply hopper 3 is supplied to the weighing hopper 4 (step S5). At this time, the weighing hopper 4 receives the object M while keeping the inner gate 4a and the outer gate 4b closed. In the above example, the weighing object M of about 20 grams is supplied to each weighing hopper 4. Then, the gate 3a of the supply hopper 3 is immediately closed, the feeder pan 2a (vibrator 2b) is vibrated, and the object to be weighed M is supplied to the supply hopper 3 (step S6).

  Subsequently, the calculation control unit 8 acquires the exact weight of the object M to be held by the weighing hopper 4 (step S7). Specifically, a signal from the weighing unit 5 is acquired, and an accurate weight value of the weighing object M held by each weighing hopper 4 is calculated based on this signal.

  Subsequently, a combination calculation for the first target weight is performed (step S8). Specifically, based on the acquired weight value of each weighing object M, the weighing hopper 4 holding the weighing object M whose total weight is within the allowable range (within a predetermined range) from the first target weight. A combination is selected and this is the first group. The allowable range includes the first target weight. In the above-described example, a combination of four weighing hoppers 4 holding the objects to be weighed M is selected from the fourteen weighing hoppers 4 so that the total weight is within an allowable range from 80 grams. The first group.

  Subsequently, a combination calculation for the second target weight is performed (step S9). Specifically, among the weighing hoppers 4 other than the first group, the weighing hopper 4 that holds the weighing object M whose total weight is within the allowable range (within a predetermined range) from the second target weight. A combination is selected and this is the second group. The allowable range includes the second target weight. In the above-described example, the combination of six weighing hoppers 4 that hold the objects to be weighed M so that the total weight is within a predetermined range from 120 grams among the ten weighing hoppers 4 other than the first group. And select this as the second group.

Subsequently, the discharge command signal from the packaging machine 300 is confirmed, and the gates of the weighing hoppers 4 belonging to the first group and the second group are opened (step S10). Specifically, the arithmetic control unit 8 confirms that a signal indicating that the packaging machine 300 is ready to receive an object to be weighed, that is, a discharge command signal is transmitted from the packaging machine 300. The inner gate 4a is opened for the weighing hoppers 4 belonging to the group, and the outer gate 4b is opened for the weighing hoppers 4 belonging to the second group. As a result, the weighing object M held by the weighing hopper 4 belonging to the first group is discharged to the inner chute 6a, and the weighing object M held by the weighing hopper 4 belonging to the second group is moved to the outer chute 6b. Discharged. In the above example, the object M having a total weight of about 80 grams is discharged to the inner chute 6a, and the object M having a total weight of about 120 grams is discharged to the outer chute 6b. In addition, each discharged | emitted to-be-measured item M is discharged | emitted and packaged in the two types of packaging bags prepared with the packaging machine 300, respectively.
Subsequently, the inner gate 4a and the outer gate 4b of the weighing hopper 4 from which the object to be weighed M is discharged are closed, and the gate 3a of the supply hopper 3 corresponding to the weighing hopper 4 is opened (step S11). As a result, the object to be weighed M is supplied to the weighing hopper 4 which has become empty. Then, the gate 3a of the opened supply hopper 3 is closed, and the linear feeder 2 (vibrator 2b) corresponding to the supply hopper 3 is vibrated to supply the object M to the empty supply hopper 3 (step S12). .

Subsequently, it is determined whether or not the operation stop switch has been turned ON by the operator's operation (that is, whether or not a stop command has been issued). If it is determined that the operation stop switch is not NO (stop command is not issued) (NO in step S13), the process returns to step S7, and steps S7 to S12 are repeated. On the other hand, if it is determined that the operation stop switch is ON (stop command is issued) (YES in step S13), the process ends. Thus, the cycle of measurement (step S7), combination calculation (steps S8 and S9), discharge (step S10), and supply (steps S11 and S12) is repeated until the operation stop switch is turned on by the operator. . The above is the flow of the combination weigher 100 according to this embodiment.
FIG. 3 is a timing chart showing the timing for performing the combination calculation of the combination weigher 100 according to the present embodiment and the opening timing of the inner gate 4a and the outer gate 4b of the weighing hopper 4. In FIG. 3, the horizontal axis indicates time, and in order from the top, combination calculation for the first target weight, combination calculation for the second target weight, opening of the inner gate 4a of the weighing hopper 4 belonging to the first group, and The opening of the outer gate 4b of the weighing hopper 4 belonging to the second group is shown.

  As shown in FIG. 3, according to the present embodiment, the calculation control unit 8 performs a combination calculation for the first target weight, performs a combination calculation for the second target weight, and outputs a discharge command signal from the packaging machine 300. In addition, the inner gate 4a of the weighing hopper 4 belonging to the first group and the outer gate 4b of the weighing hopper 4 belonging to the second group are simultaneously opened. These cycles are then repeated. According to such a cycle, the same number of products whose contents are approximately the first target weight and those whose contents are approximately the second target weight are manufactured. The above is the measurement operation of the combination weigher 100 according to the present embodiment.

Here, considering the combination accuracy when the first target weight is 80 grams and the second target weight is 120 grams, ₁₄ C ₄ = 1001 combinations are selectable in the combination calculation for the first target weight. In the combination calculation for the second target weight, there are ₁₀ C ₆ = 210 selectable combinations, all of which are 210 or more, and general combination accuracy can be maintained. Also from this result, according to the present embodiment, it is understood that the combination accuracy is easily maintained as compared with the conventionally proposed combination weigher that divides the left and right parts.

In this embodiment, two target weights are compared, and the smaller one is set as the first target weight and the larger one is set as the second target weight (see step S2). This is to make it easy to maintain accuracy. If the larger one of the input target weights is set as the first target weight, in the above example, there are ₁₄ C ₆ = 3003 combinations that can be selected in the combination calculation for the first target weight. In the combination calculation relating to the second target weight, there are ₈ C ₄ = 70 combinations that can be selected, and general combination accuracy cannot be ensured. Thus, if the larger one of the target weights is set as the first target weight and the smaller one is set as the second target weight, there is a high possibility that the combination accuracy cannot be maintained in the combination calculation for the second target weight. It ends up. From the above results, when it is necessary to maintain a combination accuracy of a certain level or higher for both of the combination calculations for the first target weight and the second target weight, the smaller one of the input target weights is set to the first target weight. It is effective to use weight. The above is the description of the combination weigher 100 according to the first embodiment.

(Second Embodiment)
Next, a combination weigher 100 according to a second embodiment of the present invention will be described with reference to FIG. In the first embodiment, the inner gate 4a of the weighing hopper 4 belonging to the first group and the outer gate 4b of the weighing hopper 4 belonging to the second group are always opened simultaneously (see FIG. 3). In the embodiment, the configurations of both are different in that the inner gate 4a of the weighing hopper 4 belonging to the first group and the outer gate 4b of the weighing hopper 4 belonging to the second group are opened at different time intervals. Other configurations are basically the same.

  FIG. 4 is a timing chart showing the timing for performing the combination calculation of the combination weigher 100 according to the present embodiment, and the opening timing of the inner gate 4a and the outer gate 4b of the weighing hopper 4. In FIG. 4, the horizontal axis indicates time, and in order from the top, combination calculation for the first target weight, combination calculation for the second target weight, opening of the inner gate 4 a of the weighing hopper 4 belonging to the first group, and The opening of the outer gate 4b of the weighing hopper 4 belonging to the second group is shown.

  As shown in FIG. 4, in the present embodiment, first, the combination calculation for the first target weight is performed, the combination calculation for the second target weight is performed, the discharge command signal from the packaging machine 300 is confirmed, and the first calculation is performed. The inner gate 4a of the weighing hopper 4 belonging to the group and the outer gate 4b of the weighing hopper 4 belonging to the second group are simultaneously opened. The process up to this point is the same as that shown in FIG. 3, but subsequently, the combination calculation for the first target weight is performed, the combination calculation for the second target weight is performed, and the discharge command signal from the packaging machine 300 is confirmed. Thereafter, the outer gate 4b of the weighing hopper belonging to the second group is not opened, and only the inner gate 4a of the weighing hopper 4 belonging to the first group is opened. Thereafter, the above two patterns are repeated. That is, the cycle in which the inner gate 4a of the weighing hopper 4 belonging to the first group and the outer gate 4b of the weighing hopper 4 belonging to the second group are simultaneously opened and the cycle in which only one is opened are alternately repeated. . In other words, the inner gate 4a of the weighing hopper 4 belonging to the first group and the outer gate 4b of the weighing hopper 4 belonging to the second group are opened at different time intervals. In this case, the discharge command signal from the packaging machine 300 is preferably transmitted separately for the first target weight and for the second target weight.

  Thus, by opening the inner gate 4a of the weighing hopper 4 belonging to the first group and the outer gate 4b of the weighing hopper 4 belonging to the second group at different time intervals, the weight of the contents is approximately the first. Both products can be manufactured such that the number of products that are the target weight and the number of products whose contents are approximately the second target weight are different. In the case of FIG. 4, a product including an object to be weighed whose total weight is approximately the first target weight is manufactured twice as much as a commodity including an object to be weighed whose total weight is approximately the second target weight. In the above, the combination calculation is performed for the second target weight even when the outer gate 4b of the weighing hopper 4 belonging to the second group is not opened, but when the outer gate 4b is not opened, the first operation is performed. The combination calculation for two target weights may not be performed.

  The above is the description of the combination weigher 100 according to the second embodiment. According to this embodiment, even if it is a case where goods of different contents are manufactured simultaneously using one combination, the number of production can be adjusted individually, respectively.

  The embodiment according to the present invention has been described above with reference to the drawings. However, the specific configuration is not limited to these examples, and there are design changes and the like without departing from the gist of the present invention. Are also included in the present invention. For example, the case where the combination calculation is performed for two different target weights has been described above, but a third target weight different from the two target weights may be further set.

  According to the present invention, it is possible to provide a combination weigher that can simultaneously manufacture products having different weights and that can easily maintain the combination accuracy. Therefore, it is useful in the technical field of combination weighers.

It is a schematic block diagram of the combination scale which concerns on one Embodiment of this invention. It is the flowchart which showed the action | operation of the combination scale which concerns on one Embodiment of this invention. It is a timing chart of the combination weigher concerning one embodiment of the present invention. It is a timing chart of the combination scale which concerns on other embodiment of this invention.

Explanation of symbols

100 Combination Weigher 2 Linear Feeder 3 Supply Hopper 3a Gate 4 Weighing Hopper 4a Inner Gate 4b Outer Gate 5 Weighing Unit 6a Inner Chute 6b Outer Chute 8 Arithmetic Control Unit M Object to be Weighed

Claims (5)

A plurality of weighing hoppers that hold an object to be weighed by closing an openable / closable gate provided at the bottom, a weighing unit for weighing the object to be weighed held by the weighing hopper, and the gate of the weighing hopper are opened. And at least two discharge paths as discharge destinations of the objects to be weighed, and a calculation control unit for obtaining the weight of the objects to be weighed from the weighing unit and performing combination calculation and controlling opening and closing of the gate of the weighing hopper. Prepared,
The arithmetic control unit includes a weighing hopper that holds an object to be weighed whose total weight falls within a predetermined range from the first target weight based on the weight of the object to be weighed held by each weighing hopper acquired from the weighing unit. A combination is selected and these are set as a first group, and objects to be weighed in a weighing hopper other than the first group and having a total weight within a predetermined range from a second target weight different from the first target weight are selected. The combination of the weighing hoppers to be held is selected and these are set as the second group, the gates of the weighing hoppers belonging to the first group are opened, the objects to be weighed are discharged into one discharge path among the discharge paths, and the first Open the gates of the weighing hoppers belonging to group 2 and discharge the objects to be measured to another discharge path different from the one discharge path ;
A combination weigher in which a gate of a weighing hopper belonging to the first group and a gate of a weighing hopper belonging to the second group are opened at different time intervals . The combination weigher according to claim 1, wherein a gate of the weighing hopper belonging to the first group and a gate of the weighing hopper belonging to the second group are opened synchronously. A linear feeder that supplies the weighing hopper with the object to be weighed supplied to the upper surface by vibrating;
The arithmetic control unit determines, as a supply weight, a weight that is approximately equal to a weight difference between the first target weight and the second target weight or approximately equal to an integer of the weight difference. The combination weigher according to claim 1 or 2 , wherein the linear feeder is vibrated so that an object to be weighed is supplied to the weighing hopper. The arithmetic control unit is configured such that a weighing hopper has a weight that is substantially equal to a weight difference between the first target weight and the second target weight, and a weight that is approximately equal to an integral number of a fraction of the weight difference. When the first group is selected, the number of combinations that can be selected when selecting the first group and the number of combinations that can be selected when selecting the second group are weights that ensure a certain amount or more. The combination weigher according to claim 3 , which is determined as the supply weight. An input unit for inputting a target weight is provided. When at least two different target weights are input to the input unit, the calculation control unit acquires the target weight input to the input unit, and the smaller of the target weights. The combination weigher according to any one of claims 1 to 4 , wherein a target weight of one is set to the first target weight and a larger target weight is set to the second target weight.

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