JP5825971B2 - Combination scale - Google Patents

Description

  The present invention relates to a combination weigher for obtaining a combination in which the total weight of objects to be weighed is within a predetermined target weight range.

  In a combination weigher, for example, an object to be weighed is supplied to a plurality of weighing units, a combination operation is performed using the weight values of the objects to be weighed in each weighing unit, and the total weight falls within a predetermined weight range. And the objects selected for the combination are discharged.

  In such a combination weigher, each weighing unit that weighs an object to be weighed uses, for example, a weighing conveyor configured to support a belt conveyor with a weight sensor such as a load cell. What was made to discharge | emit is disclosed by patent document 1,2.

International Publication WO93 / 23724 JP 2005-315579 A

  In general, in a combination weigher, a combination is selected so that objects to be weighed held in some weighing units among all weighing units are discharged. Therefore, when an operator supplies an object to be weighed, he / she must supply the object to be weighed by searching for a weighing unit that does not hold the object to be weighed from all the weighing units. There is a problem that the burden is large. Further, when an object to be weighed is automatically supplied from a supply device provided for each weighing unit, the supply operation must be individually controlled for each supply device, and the control is complicated. There is a problem of becoming.

  The present invention has been made in order to solve the above-described problems, and can uniformly perform a supply operation of an object to be weighed by a worker or a supply operation by a supply device for all weighing units. The purpose is to provide a combination weigher.

  In order to achieve the above object, a combination weigher according to a first aspect of the present invention temporarily holds a supplied object to be weighed and transports the held object to be weighed, and on the weighing conveyor. A weighing unit having a weight sensor for weighing the object to be weighed, and one or more standby conveyors to which the object to be weighed on the weighing conveyor is supplied and temporarily holds the supplied object to be weighed A plurality of weighing units are configured such that the total number of objects to be weighed held by all the standby conveyors is 2 or more in each weighing unit, and one is selected from each of all the weighing units. A combination of objects to be weighed and selected from the objects to be weighed held on the standby conveyor, and a discharge combination consisting of a combination of objects to be weighed within a target weight range is obtained. Union And it includes a means, and a conveyor control means for conveying operating the standby conveyor to discharge only the objects to be weighed which have been selected to the discharge combination.

  According to this configuration, since one object to be weighed is selected as the discharge combination from each of all the weighing units, the discharge combination is obtained and the object to be weighed selected as the discharge combination is discharged. Each time, the objects to be weighed may be supplied one by one to the weighing conveyors of all weighing units. Therefore, when manually supplying the objects to be weighed to each weighing unit, the operator must measure the weighing conveyors of all weighing units every time the objects to be weighed selected for the discharge combination are discharged. What is necessary is just to supply a to-be-measured object, and supply work can be performed uniformly and it is not necessary to search for the weighing conveyor which should supply a to-be-measured object, Therefore A burden of an operator can be reduced. In addition, when supplying the objects to be weighed to the respective weighing units by the supply device, the supply operation to all the weighing units can be performed uniformly, and the operation of the supply device can be easily controlled.

  A combination weigher according to a second embodiment of the present invention is a weighing conveyor for temporarily holding a supplied object to be weighed and conveying the held object to be weighed, and a weight sensor for measuring the weight of the object to be weighed on the weighing conveyor. And a plurality of weighing units to which the objects to be weighed on the weighing conveyor are supplied, and one or more standby conveyors that temporarily hold the supplied objects to be weighed, The objects to be weighed are selected one by one from the objects to be weighed and held on the weighing conveyor and the standby conveyor, and the total weight falls within the target weight range. A combination means for obtaining a discharge combination comprising a combination of weighing objects, and a controller for conveying the weighing conveyor and the standby conveyor so as to discharge only the objects to be weighed selected for the discharge combination. And a A control means.

  According to this configuration, since one object to be weighed is selected as the discharge combination from each of all the weighing units, the discharge combination is obtained and the object to be weighed selected as the discharge combination is discharged. Each time, the objects to be weighed may be supplied one by one to the weighing conveyors of all weighing units. Therefore, when manually supplying the objects to be weighed to each weighing unit, the operator must measure the weighing conveyors of all weighing units every time the objects to be weighed selected for the discharge combination are discharged. What is necessary is just to supply a to-be-measured object, and supply work can be performed uniformly and it is not necessary to search for the weighing conveyor which should supply a to-be-measured object, Therefore A burden of an operator can be reduced. In addition, when supplying the objects to be weighed to the respective weighing units by the supply device, the supply operation to all the weighing units can be performed uniformly, and the operation of the supply device can be easily controlled.

  In each of the weighing units, a plurality of standby conveyors are provided so as to include first and second standby conveyors, and the first standby conveyor is discharged from one end of the weighing conveyor and dropped. The weighing object may be supplied, and the second standby conveyor may be configured to be supplied with an object to be weighed that is discharged from one end of the first standby conveyor and dropped.

  According to this configuration, each weighing unit is provided with a plurality of standby conveyors, and the weight values of the objects to be weighed on the plurality of standby conveyors can be used for the combination calculation, so that the combination accuracy can be improved. . Here, when the objects to be weighed on the weighing conveyor are included in the selection targets for the discharge combination, the objects to be weighed on the weighing conveyor selected for the discharge combination are placed at the other end of the weighing conveyor (the objects to be weighed on the standby conveyor). What is necessary is just to make it discharge | emit from the end opposite to the one end to supply.

  Further, the standby conveyor may be configured to hold a plurality of supplied objects to be weighed at different positions.

  According to this configuration, since the objects to be weighed supplied to the standby conveyor are held at different positions, the weight values of a plurality of objects to be weighed are combined and calculated for one standby conveyor. The number of combinations can be further increased, and the combination accuracy can be further improved.

  A combination weigher according to a third embodiment of the present invention temporarily holds a supplied object to be weighed and can transport the held object to be measured in two directions opposite to each other, and on the weighing conveyor A weight sensor for measuring the weight of an object to be weighed, and an object to be weighed that is disposed on both ends of the weighing conveyor and is weighed on the weighing conveyor, and a plurality of objects to be weighed are provided at different positions. A plurality of weighing units having two standby conveyors that can hold and transport the held objects to be measured in two directions opposite to each other, and select one from each of the weighing units. A combination of objects to be weighed, and a combination for obtaining a discharge combination consisting of a combination of objects to be weighed whose total weight falls within a target weight range among the objects to be weighed held on the standby conveyor It comprises a stage, and a conveyor control means for conveying operating the standby conveyor to discharge only the objects to be weighed which have been selected to the discharge combination.

  According to this configuration, since one object to be weighed is selected as the discharge combination from each of all the weighing units, the discharge combination is obtained and the object to be weighed selected as the discharge combination is discharged. Each time, the objects to be weighed may be supplied one by one to the weighing conveyors of all weighing units. Therefore, when manually supplying the objects to be weighed to each weighing unit, the operator must measure the weighing conveyors of all weighing units every time the objects to be weighed selected for the discharge combination are discharged. What is necessary is just to supply a to-be-measured object, and supply work can be performed uniformly and it is not necessary to search for the weighing conveyor which should supply a to-be-measured object, Therefore A burden of an operator can be reduced. In addition, when supplying the objects to be weighed to the respective weighing units by the supply device, the supply operation to all the weighing units can be performed uniformly, and the operation of the supply device can be easily controlled.

  Further, in the plan view, all the weighing conveyors are arranged in parallel in a direction perpendicular to the machine length direction, and in each weighing unit, each of the weighing conveyor and the two standby conveyors in the machine direction. May be arranged in the same direction in plan view.

  According to this configuration, the distance between the weighing units adjacent to each other can be shortened and the length of the weighing unit group in the arrangement direction can be shortened, so that the combination weigher can be made compact. In addition, since the length of the measuring unit group in the arrangement direction can be shortened, when an operator supplies an object to be weighed, it becomes easier to perform the supplying operation and the burden on the operator can be further reduced. .

  Further, in each of the weighing units, the two standby conveyors are arranged in parallel in a plan view, and the weighing conveyor is disposed between the two standby conveyors so that the standby conveyor and the longitudinal direction are orthogonal to each other. It may be arranged.

  According to this structure, the level | step difference of a weighing conveyor and a standby conveyor can be made small, and it can prevent damage with respect to the to-be-measured object which is easy to be damaged by the impact at the time of dropping, etc.

  The combination means is configured to obtain the discharge combination from the objects to be weighed held on the weighing conveyor and the standby conveyor, and the conveyor control means is selected as the discharge combination. The weighing conveyor and the standby conveyor are transported so as to discharge only the objects to be weighed. At this time, the objects to be weighed selected on the discharge combination and held on the weighing conveyor are passed through the waiting conveyor. The weighing conveyor and the standby conveyor may be transported so as to be discharged.

  According to this configuration, since the objects to be weighed on the weighing conveyor are also selected as the discharge combination, the number of combinations is further increased, and the combination accuracy can be further improved.

  Further, the standby conveyor, when receiving and holding an object to be weighed supplied from the weighing conveyor, is held at a position away from a receiving position for receiving the object to be weighed, and is selected as the discharge combination and It may be configured to discharge the object to be weighed discharged from the weighing conveyor after receiving it at the receiving position.

  According to this configuration, the objects to be weighed on the weighing conveyor selected as the discharge combination can be easily discharged via the standby conveyor.

  Further, the weighing conveyor is configured to temporarily hold each of the objects to be weighed supplied at different timings at each of a plurality of holding positions determined at predetermined intervals in the transport direction, and the weight sensor Weight calculating means for calculating the weight of the object to be weighed held at each of the holding positions based on the measured value may be further provided.

  According to this configuration, since the plurality of objects to be weighed are held on the weighing conveyor, the number of combinations is further increased, and the combination accuracy can be further improved.

  The combination means selects two objects to be weighed from at least one weighing unit when the discharge combination cannot be obtained, and the two objects to be weighed are selected. It is a combination of objects to be weighed that is selected one by one from the remaining weighing parts, so that the same number of objects to be weighed as the number of weighing parts are not selected, and the total weight is A special discharge combination comprising a combination of objects to be weighed within a target weight range is obtained, and the conveyor control means is configured to obtain the special discharge combination when the combination means obtains the special discharge combination. The weighing object selected for the combination is discharged, and the weighing object held on the weighing conveyor of the other weighing unit is moved from the held position to another position on the weighing conveyor. It may be configured to control the metering conveyor to move onto the waiting conveyor.

  According to this configuration, even when the discharge combination by the combination process described above cannot be obtained, a special discharge combination is obtained, and all the objects to be weighed on the weighing conveyor of the other weighing units are moved. The operation of the combination weigher can be continued by continuously supplying the objects to be weighed one by one to the weighing unit.

  The combination weigher according to the fourth aspect of the present invention temporarily holds each of the objects to be weighed supplied at different timings at each of a plurality of holding positions determined at predetermined intervals in the transport direction. A weighing conveyor capable of conveying a weighing object in two directions opposite to each other, a weight sensor for weighing the object to be weighed on the weighing conveyor, and each holding based on a measurement value of the weight sensor A plurality of weighing units having a weight calculating means for calculating the weight of an object to be weighed held at a position, and a combination of objects to be weighed selected from each of all the weighing units. And a combination means for obtaining a discharge combination comprising a combination of objects to be weighed within a target weight range, and the weighing conveyor to discharge only the objects to be weighed selected for the discharge combination. And a conveyor control means for feeding operation.

  According to this configuration, since one object to be weighed is selected as the discharge combination from each of all the weighing units, the discharge combination is obtained and the object to be weighed selected as the discharge combination is discharged. Each time, the objects to be weighed may be supplied one by one to the weighing conveyors of all weighing units. Therefore, when manually supplying the objects to be weighed to each weighing unit, the operator must measure the weighing conveyors of all weighing units every time the objects to be weighed selected for the discharge combination are discharged. What is necessary is just to supply a to-be-measured object, and supply work can be performed uniformly and it is not necessary to search for the weighing conveyor which should supply a to-be-measured object, Therefore A burden of an operator can be reduced. In addition, when supplying the objects to be weighed to the respective weighing units by the supply device, the supply operation to all the weighing units can be performed uniformly, and the operation of the supply device can be easily controlled.

  Also in this case, when the combination means cannot obtain the discharge combination, it is configured to obtain the same special discharge combination as described above, and the conveyor control means is configured so that the combination means has the special discharge combination. When a combination is obtained, the objects to be weighed selected for the special discharge combination are discharged and held on the weighing conveyor of another weighing unit in which the objects to be weighed are not selected for the special discharge combination. The weighing conveyor may be configured to control the weighing object to be moved from the held position to another position on the weighing conveyor.

  Further, in each of the weighing conveyors, one of the holding positions is predetermined as a supply position for supplying an object to be weighed, and the object to be weighed is manually supplied to the supply position, and is placed above the supply position. It may further include a cover that has an opening for supplying a weighing object and covers the upper side of the weighing conveyor.

  According to this configuration, it is possible to prevent the operator from supplying the object to be measured to an incorrect position different from the supply position.

  Further, in each of the weighing units, a first is disposed above the weighing conveyor, temporarily holds the supplied weighing object, and supplies the weighing object to one of the two holding positions. And a plurality of sorting devices configured to have a second discharge gate for supplying an object to be weighed to the other.

  According to this configuration, an object to be weighed can be supplied to the two holding positions of the weighing conveyor by the sorting device while the weighing conveyor is stopped.

  Moreover, you may further provide the supply timing alerting | reporting means for alert | reporting to a worker the timing which should supply a to-be-measured item to each said weighing | measuring part.

  According to this configuration, since the operator only has to supply the object to be measured based on the notification by the supply timing notification unit, it is possible to easily perform the operation of supplying the object to be measured.

  In the present specification and claims, one, two, three or a plurality of objects to be weighed are objects to be weighed once, twice, three times or a plurality of times. This means that each object to be weighed may be some kind of aggregate (such as a collection of a plurality of articles).

  The present invention has the above-described configuration, and in the combination weigher, it is possible to uniformly perform the supply operation of the objects to be weighed by the operator or the supply operation by the supply device for all the weighing units. There is an effect. As a result, when manually supplying an object to be weighed, it is possible to reduce the burden on the worker who performs the supply work, and when supplying an object to be weighed by the supply device, it is easy to control the supply operation. There is an effect that can be done.

(A) is the schematic plan view which looked at the combination balance of the 1st structural example of embodiment of this invention from the top, (b) is the schematic schematic diagram which looked at the combination balance from the side. It is a block diagram which shows schematic structure of the combination scale of the 1st structural example of embodiment of this invention. (A), (b) is a flowchart which shows an example of operation | movement of the combination scale of the 1st structural example of embodiment of this invention. (A) is the schematic plan view which looked at the combination balance of the 2nd structural example of embodiment of this invention from the top, (b) is the schematic schematic diagram which looked at the combination balance from the side. (A) is the schematic plan view which looked at the combination balance of the 3rd structural example of embodiment of this invention from the top, (b) is the schematic schematic diagram which looked at the combination balance from the side. (A) is the schematic plan view which looked at the combination scale of the 4th structural example of embodiment of this invention from the top, (b) is the schematic schematic diagram which looked at the combination scale from the side. It is a figure which shows an example of the distribution apparatus in embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout all the drawings, and redundant description thereof is omitted. Further, the present invention is not limited to the following embodiment. Moreover, the numerical value illustrated below (for example, the number of the measurement parts Cw etc.) is an example, and is not limited to the numerical value.

  In the following embodiments, for the sake of convenience, “front”, “rear”, “left”, “right”, and the like are determined as shown in FIGS. 1A and 1B, for example. Moreover, in the following embodiment, the combination weigher of the 1st-4th structural example is demonstrated as an example, respectively.

(Embodiment)
In each configuration example described below, there is a novel, which is not in the prior art, which includes a plurality of weighing units having weighing conveyors, and selects the objects to be weighed one by one from all the weighing units to obtain a discharge combination. They have a common configuration.

  The first configuration example described below shows a configuration in which a discharge combination is obtained by a combination of only the objects to be weighed on the standby conveyor. In the second to fourth structure examples, the objects to be weighed on the weighing conveyor and the standby conveyor are shown. The structure which calculated | required discharge | emission combination by the combination of these is shown.

[First configuration example]
FIG. 1A is a schematic plan view of the first combination example of the embodiment of the present invention as viewed from above, and FIG. 1B is a schematic diagram of the combination scale as viewed from the side. . FIG. 2 is a block diagram showing a schematic configuration of the combination weigher of the first configuration example of the embodiment of the present invention.

  This combination weigher includes a plurality of (four in this example) weighing units Cw, a discharge device 13, an operation indicator 4, a control unit 5, and the like.

  Each weighing unit Cw includes a weighing conveyor device having a weighing conveyor 1 and a weight sensor 2, and standby conveyors 3a and 3b. The weight sensor 2 is a load cell or the like that supports the weighing conveyor 1 and measures the weight of an object to be weighed on the weighing conveyor 1.

  The weighing conveyor 1 is configured by a belt conveyor having an endless belt, and can be transported by switching the transport direction to two directions that are opposite to each other. Here, the conveyance direction can be switched between a right direction (direction from left to right) and a left direction (direction from right to left). That is, the weighing conveyor 1 can carry the object P in both the left and right directions. In the weighing conveyor 1, one holding position H1 is defined as a position for holding the workpiece P when the conveyance is stopped.

  The two standby conveyors 3a and 3b are arranged on the left and right ends of the weighing conveyor 1 so that the machine length direction (conveying direction) is the same as that of the weighing conveyor 1 in plan view. Each of the standby conveyors 3a and 3b is constituted by a belt conveyor, and, like the weighing conveyor 1, can switch the conveyance direction to two directions (here, the right direction and the left direction) for conveyance. One standby conveyor 3a is disposed diagonally to the right of the weighing conveyor 1 and supplied with an object to be weighed that is discharged from one end (right end) of the weighing conveyor 1 and dropped. The other standby conveyor 3b is disposed diagonally to the left of the weighing conveyor 1 and supplied with the objects to be weighed that are discharged from the other end (left end) of the weighing conveyor 1 and fall. Each of the standby conveyors 3a and 3b is transported so that the two objects to be weighed (the objects to be weighed twice) supplied from the weighing conveyor 1 are held apart. In other words, each of the standby conveyors 3a and 3b has a plurality (two in this case) of holding positions (H3, H4, H5, and H6) as the positions for holding the workpiece P when the conveyance is stopped. The transport operation is performed so that the predetermined distance L2 (hereinafter also referred to as “predetermined distance L2”) exists in the transport direction).

  In plan view, the weighing conveyors 1 of all the weighing units Cw are arranged in parallel in a direction orthogonal to the machine direction. Similarly, the standby conveyors 3a and 3b are also arranged in parallel in a direction orthogonal to the machine direction.

  The discharge device 13 is provided to convey (discharge) an object to be measured P selected from the discharge combination described later and discharged from each of the standby conveyors 3a and 3b. Here, the discharge device 13 includes a discharge conveyor 13a that is disposed below all the weighing units Cw and that conveys the objects to be weighed in the direction of arrow a, and a discharge conveyor 13b that conveys the objects to be weighed in the direction of arrow b. ing. The objects to be weighed P discharged from the standby conveyors 3a and 3b are conveyed in the direction of arrow a by the discharge conveyor 13a and discharged onto the discharge conveyor 13b. And the to-be-measured item P conveyed by the discharge conveyor 13b to the arrow b direction is supplied to a back | latter stage apparatus (not shown).

  A plurality of weighing units Cw, a discharge conveyor 13a excluding both end portions, and the like are accommodated in the apparatus main body 11 formed of a housing. In addition, the top plate portion (cover) of the apparatus main body 11 is provided with an opening 11 a serving as a supply port for the object to be weighed P at an upper portion of the holding position H <b> 1 of the weighing conveyor 1. The workpiece P is supplied from the opening 11a to the holding position H1 (supply position) by the operator.

  In the apparatus main body 11, the conveyor drive circuit units 8a and 8b and the A / D conversion unit 9 shown in FIG.

  In addition, the weight sensor 2 supporting each weighing conveyor 1 measures the weight of the object to be weighed on the weighing conveyor 1, and the measured value (analog weight signal) is converted into a digital signal by the A / D conversion unit 9. It is sent to the control unit 5.

  The control unit 5 is configured by, for example, a microcontroller, and includes an arithmetic control unit 6 including a CPU and a storage unit 7 including a memory such as a RAM and a ROM. The storage unit 7 stores an operation program, operation parameter data, measurement data, and the like. The control unit 5 functions as combination means, conveyor control means, and the like. The control unit 5 may be configured by a single control device that performs centralized control, or may be configured by a plurality of control devices that perform distributed control in cooperation with each other.

  The control unit 5 executes the operation program stored in the storage unit 7 by the arithmetic control unit 6, thereby performing overall control of the combination weigher and performing combination processing described later. For example, the control unit 5 acquires the measurement value measured by each weight sensor 2 as a digital value through the A / D conversion unit 9 as needed, and stores it in the storage unit 7 if necessary. Further, the conveying operation of each weighing conveyor 1 and the standby conveyors 3a, 3b is controlled via the conveyor driving circuit unit 8a, and the conveying operation of the discharge conveyors 13a, 13b is controlled via the conveyor driving circuit unit 8b. Further, a discharge command signal is input from a subsequent apparatus (not shown) via the I / O circuit unit 10 and a discharge completion signal is output to the subsequent apparatus. In addition, a signal is input from the operation display 4 and a signal such as data to be displayed on the operation display 4 is output.

  The operation indicator 4 includes, for example, a touch screen type display (display device). On the screen of the display, the operation of the combination weigher can be started and stopped, operation parameters can be set, and the like. The result of combination processing (combination weight, etc.) by the control unit 5 can be displayed on the display screen.

  An example of the operation of the combination weigher of the first configuration example of the present embodiment configured as described above will be described. FIGS. 3A and 3B are flowcharts showing an example of the operation of the combination weigher of the first configuration example of the present embodiment. The operation of this combination weigher is realized by the processing of the control unit 5. It should be noted that all the information necessary for controlling the operation of the combination weigher is stored in the storage unit 7, and all the information to be stored during the operation is stored in the storage unit 7. The objects to be weighed P are, for example, agricultural products, side dishes, etc., and the individual objects to be weighed P may be constituted by some aggregate. In the following description, the symbol P indicating the object to be weighed may be omitted.

  When the weighing conveyor 1 is in the transport stop state and the weighing object P does not exist at the holding position H1 of the weighing conveyor 1, the operator can move the weighing objects P to the holding position H1 through the opening 11a one by one, for example. Supply (load) work.

  In the control unit 5, the weighing value of each weight sensor 2 is acquired from the A / D conversion unit 9 at regular time intervals, and the weighing conveyor 1 to which an object to be weighed is newly supplied based on the weighing value of the weight sensor 2. And the weight value of the object to be weighed newly supplied to the weighing conveyor 1 is recognized and stored. Here, when recognizing the weighing conveyor 1 to which the object to be weighed is newly supplied, the weighing value of the weight sensor 2 is compared with a preset loading detection reference value, and the weighing value is equal to or greater than the loading detection reference value. If it is, it is determined that a new object to be weighed has been supplied, and if it is less than the loading detection reference value, it is determined that no new object to be weighed has been supplied. The loading detection reference value is set in advance in the control unit 5 and stored in the storage unit 7. Here, in each weighing conveyor 1, the objects to be weighed are supplied to the holding position H1 and weighed at that position.

  FIG. 3A is a flowchart showing an example of the operation of the combination weigher regarding an arbitrary weighing unit Cw. In the following description, the weight values at the holding positions (H1, H3 to H6) are the weight values of the objects to be weighed placed at the holding positions (H1, H3 to H6). Further, for example, in the storage unit 7, the weights of the objects to be weighed existing at the holding positions H1 of the weighing conveyors 1, the holding positions H3 and H4 of the standby conveyors 3 a, and the holding positions H5 and H6 of the standby conveyors 3 b, respectively. A weight value table is stored for storing. The weight values of the objects to be weighed are stored in this weight value table, and the initial values of all the weight values are set to zero.

  In all the weighing units Cw, for example, the order of preferentially holding the objects to be weighed (priority of holding positions) is determined in advance at the holding positions H1, H3 to H6. Assume that the priorities are determined in descending order of, for example, H6, H5, H4, H3, and H1. Here, for example, when the objects to be weighed are not held at all the holding positions H1, H3 to H6, such as at the start of operation, the objects to be weighed are sequentially supplied to the holding position H1 of the weighing conveyor 1. The objects to be weighed sequentially at the holding position H1 are conveyed to the holding positions by the weighing conveyor 1 and the standby conveyors 3a and 3b based on the above-described priority order. When a new object to be weighed is supplied, the new object to be weighed is transported to the holding position with the highest priority among the holding positions not holding the object to be weighed in the shortest distance (shortest time). As described above, the control unit 5 moves the weighing conveyor 1 and the standby conveyors 3a and 3b.

  Also, the objects to be weighed are moved (conveyed) in the standby conveyors 3a and 3b based on the priority order of the holding positions.

  For example, in the standby conveyor 3a, from the state where the objects to be weighed are held at both holding positions H3 and H4, the standby conveyor 3a is conveyed rightward by a predetermined distance L2 in order to discharge the objects to be weighed at the holding position H4. When operated, the object to be weighed at the holding position H3 moves to the holding position H4. Then, the objects to be weighed are supplied from the weighing conveyor 1 to the holding position H3 where the objects to be weighed disappear.

  Further, when the object to be weighed is held at both holding positions H3 and H4, in order to discharge the object to be weighed at the holding position H3, the standby conveyor 3a is transported to the left by a predetermined distance L2, The object to be weighed at the holding position H4 moves to the holding position H3, and the object to be weighed disappears at the holding position H4. Immediately after this, in order to move the object to be weighed at the holding position H3 to the holding position H4, the standby conveyor 3a is moved to the right by a predetermined distance L2. Then, the objects to be weighed are supplied from the weighing conveyor 1 to the holding position H3 where the objects to be weighed disappear.

  The standby conveyor 3b is the same as that of the standby conveyor 3a.

  For example, when it is determined in step S1 that the object to be weighed is newly supplied to the holding position H1 of the weighing conveyor 1 as described above, the measured value at that time is set as the weight Wn of the object to be newly supplied. Obtain (step S2).

  Then, it is determined whether or not the object to be weighed is held at other holding positions (H3 to H6) other than the holding position H1 (step S3). This determination is made based on, for example, whether or not the weight values at the other holding positions (H3 to H6) of the weight value table are zero.

  When the object to be weighed is not held at the other holding positions (H3 to H6), the object to be weighed is transported to the other holding position that is not held at the shortest distance (step S4). When there are a plurality of other holding positions where the object to be weighed is not held, the object to be weighed is transported to the other holding position with the highest priority among them at the shortest distance. Here, when the object to be weighed is transported to the holding positions H3 and H5, the controller 5 only needs to operate the weighing conveyor 1, and when the object to be weighed is transported to the holding positions H4 and H6. May carry out the carrying operation of the weighing conveyor 1 and the standby conveyors (3a, 3b) corresponding to the carrying destination.

  And the weight Wn of the said to-be-measured object is memorize | stored as a weight value of the holding position of the conveyance destination of a weight value table (step S5).

  In step S3, when there is no other holding position (H3 to H6) where the object to be weighed is not held, the weight Wn of the object to be weighed is stored as the weight value of the holding position H1 of the weight value table. (Step S5).

  The above processing is performed every time an object to be weighed is newly supplied to an arbitrary weighing conveyor 1. Therefore, all the weights of the objects P to be weighed and held at the holding positions are stored in the weight value table.

  Here, the combination process by the control unit 5 will be described. In this combination processing, the weight value table in the storage unit 7 is referred to, and based on the weights of the objects to be weighed P held on the standby conveyors 3a and 3b of all the weighing units Cw (weight values at the holding positions H3 to H6). The combination calculation is performed, and one to-be-measured item is selected from each of all the weighing units Cw, and the total weight (combination weight) is within the target weight range (allowable range for the combination target weight). One combination of the objects to be weighed is obtained and determined as a discharge combination. When there are a plurality of corresponding combinations, for example, the combination having the smallest absolute value of the difference between the combination weight and the combination target weight is determined as the discharge combination.

  Then, the objects to be weighed selected as the discharge combination are conveyed by the standby conveyors 3a and 3b holding the objects to be weighed and discharged onto the discharge conveyor 13a.

  Here, the control unit 5 is, for example, a predetermined distance with respect to the standby conveyors (3a, 3b) in which the objects to be weighed at the holding positions (H3, H5) closer to the inside near the weighing conveyor 1 are selected as the discharge combination. After transporting L2 as a transport distance in the inward direction (leftward for standby conveyor 3a, rightward for standby conveyor 3b) and discharging the objects to be held (H3, H5), the same predetermined With the distance L2 as the transport distance, it is transported in the outer direction (rightward for the standby conveyor 3a, leftward for the standby conveyor 3b) and stopped.

  Then, the weighing conveyor 1 is transported to supply the objects to be weighed to the holding positions (H3, H5) where the objects to be weighed disappear.

  When the objects to be weighed at the holding positions H3 and H5 of the standby conveyors 3a and 3b are discharged, the transport distance of the standby conveyors 3a and 3b may be shorter than L2 as long as the objects to be weighed can be discharged. After that, the distance to be conveyed in the reverse direction may be the same distance as the previous conveyance distance.

  Further, the control unit 5 may, for example, use a predetermined distance L2 for the standby conveyors (3a, 3b) in which the objects to be weighed at the outer holding positions (H4, H6) far from the weighing conveyor 1 are selected as discharge combinations. Is transported in the outer direction (right direction in the case of the standby conveyor 3a, left direction in the case of the standby conveyor 3b), and the object to be weighed at the holding positions (H4, H6) is discharged and stopped.

  And like the above-mentioned case, in order to supply a to-be-measured object to the holding position (H3, H5) where the to-be-measured object was lost, the conveyance operation is carried out.

  Then, when the control unit 5 causes the standby conveyors 3a and 3b and the weighing conveyor 1 to be transported as described above to discharge the objects to be weighed selected for the discharge combination, before the transport operation and after the transport operation, The weight value of the holding position stored in the weight value table is changed to the weight of the object being held at the holding position after the transport operation. Update to be

  Next, an example of the repetitive operation of the combination weigher will be described with reference to FIG.

  When the discharge command signal is input from the subsequent apparatus in step S11, the control unit 5 proceeds to the process of step S12, performs the above-described combination process, and obtains the discharge combination.

  Next, in step S13, the standby conveyors 3a and 3b holding the objects to be weighed selected for the discharge combination are driven as described above, and the objects to be weighed on the standby conveyors 3a and 3b are discharged to the discharge conveyor. While conveying to 13a, 13b, discharge conveyor 13a, 13b is driven for a predetermined time, and the to-be-measured object conveyed from waiting | standby conveyor 3a, 3b is conveyed to a back | latter stage apparatus. Furthermore, as described above, the weighing conveyor 1 is also driven to supply the objects to be measured to the standby conveyors 3a and 3b that have discharged the objects to be weighed.

  Next, in step S14, as described above, the weight values of the respective holding positions stored in the weight value table are the weights of the objects to be weighed held after the standby conveyors 3a and 3b and the weighing conveyor 1 are transported. And a discharge completion signal is output to the subsequent apparatus at a predetermined timing (step S15). The above operation is repeated.

  The latter apparatus is configured to output a discharge command signal to the combination weigher at a predetermined timing and start a predetermined operation based on a discharge completion signal from the combination weigher. As the latter stage device, for example, a bag-feeding type packaging machine for bagging an object to be weighed may be arranged. In addition, as a rear-stage apparatus, for example, an apparatus (intermittent conveyance apparatus) that intermittently horizontally moves a plurality of trays (shallow boxes) connected in a ring shape may be arranged. In this case, the objects to be weighed discharged from the discharge device 13 are supplied to the tray of the intermittent transfer device. The objects to be weighed supplied to each tray are further packed in one pack by the next stage apparatus or operator. In this case, for example, the intermittent transfer device outputs a discharge command signal to the combination weigher when the tray is moved and the empty tray is moved to the discharge port of the discharge device 13 (the conveyance end portion of the discharge conveyor 13b). The tray is moved after a predetermined time has elapsed after the discharge completion signal is input from the combination weigher, and the next empty tray is moved to the discharge port of the discharge device 13.

  In this first configuration example, since one object to be weighed is selected as the discharge combination from all the weighing parts Cw, every time the objects to be weighed selected in the discharge combination are discharged, It suffices to supply the objects to be weighed one by one to the Cw weighing conveyor 1. Therefore, the operator only needs to supply the objects to be weighed to all the weighing conveyors 1 every time the objects to be weighed selected for the discharge combination are discharged, and the supply work can be performed uniformly. it can. That is, since the operator does not need to search for the weighing conveyor 1 to which the object to be weighed is supplied, the burden on the worker can be reduced.

In the first configuration example, each weighing unit Cw is provided with a plurality of standby conveyors 3a and 3b that hold the objects to be weighed on the weighing conveyor 1, and each of the standby conveyors 3a and 3b has two objects to be measured. Since the objects to be weighed are held and each object to be weighed can be discharged individually, the weight values of the four objects to be weighed on the standby conveyors 3a and 3b are used for the combination calculation in each weighing unit Cw. If, for example, four weighing units Cw are provided as in this example, 4 ⁴ (= 256) combinations can be obtained, and excellent combination accuracy (combination measurement accuracy) can be obtained. In this way, since the number of weighing units Cw can be reduced, every time the objects to be weighed selected for the discharge combination are discharged, it is sufficient to supply four objects to be weighed each time. This also reduces the burden on the operator.

  In addition, the number of weighing parts Cw having expensive weight sensors 2 can be reduced to suppress an increase in manufacturing cost, and the combination weigher can be made compact, and the installation area can be reduced. Moreover, since the combination scale can be made compact, the burden on the operator can be reduced.

  Further, as shown in FIG. 1A, in the plan view, the weighing conveyor 1 of each weighing unit Cw and the standby conveyors 3a and 3b are arranged in the same direction, and all the weighing conveyors 1 are arranged. Are arranged in parallel, the distance between the weighing units Cw adjacent to each other can be reduced, and the length of the weighing unit Cw group in the front-rear direction can be shortened. Thereby, it becomes easy to supply the objects to be weighed.

  In addition, instead of the discharge conveyors 13a and 13b, for example, a wide discharge conveyor that transports the objects to be weighed discharged from all the standby conveyors 3a and 3b in the direction from the front to the back, and a conveyance termination portion of the discharge conveyor In order to collect the objects to be weighed discharged from the vehicle, a discharge conveyor for conveying in either the left or right direction may be used.

[Second configuration example]
FIG. 4A is a schematic plan view of the combination weigher according to the second configuration example of the embodiment of the present invention as viewed from above, and FIG. 4B is a schematic diagram of the combination weigher as viewed from the side. .

  In the second configuration example, the weighing conveyor 1 has a plurality of holding positions at predetermined intervals in the machine length direction (conveying direction) as positions for holding the workpiece P when the conveyance is stopped. . Here, two holding positions H1 and H2 (first holding position H1 and second holding position H2) are determined at a predetermined interval L1 (hereinafter also referred to as “predetermined distance L1”) in the machine length direction (conveyance direction). ing. Each holding position H1, H2 holds one object P (in other words, object P for one supply). In this case, the holding position H1 is a supply position where the object to be weighed is supplied.

  In the control unit 5, the weighing value of each weight sensor 2 is acquired from the A / D conversion unit 9 at regular time intervals, and the weighing conveyor 1 to which an object to be weighed is newly supplied based on the weighing value of the weight sensor 2. And the weight value of the object to be weighed newly supplied to the weighing conveyor 1 is recognized and stored. Here, when recognizing the weighing conveyor 1 to which the object to be weighed is newly supplied, when the measured value is increased (including when the measured value is increased from 0), the increment of the measured value is set in advance. Is compared with the load detection reference value, and if the increase in the measured value is greater than or equal to the load detection reference value, it is determined that a new object is supplied, and the increase in the measurement value is newly supplied. The weight of the object. Moreover, if the increase amount of a measured value is less than a loading detection reference value, it will determine with the new to-be-measured object not being supplied. Here, the control part 5 functions as a weight calculation means.

  Here, in each weighing conveyor 1, the object to be weighed is supplied to the holding position H1, and the object to be weighed at that position is conveyed to the holding position H2.

  Further, the holding positions H3 and H5 of the standby conveyors 3a and 3b near the weighing conveyor 1 are set to positions outside the receiving positions E1 and E2 to which the objects to be weighed are supplied from the weighing conveyor 1 by a predetermined distance L2, and further held. The positions separated from the positions H3 and H5 by a predetermined distance L2 are set to the holding positions H4 and H6. That is, when supplying the objects to be weighed from the weighing conveyor 1 to the standby conveyor 3a, the control unit 5 moves the objects to be weighed supplied from the weighing conveyor 1 to the receiving position E1 to the holding positions H3 and H4. The standby conveyor 3a is moved. When the objects to be weighed are supplied from the weighing conveyor 1 to the standby conveyor 3b, the objects to be weighed supplied from the weighing conveyor 1 to the receiving position E2 are transferred to the holding positions H5 and H6. Make it work. For example, at the start of operation, the first object to be weighed supplied to the receiving position E1 (E2) of the standby conveyor 3a (3b) is moved to the holding position H3 (H5) by the conveying operation of the standby conveyor 3a (3b). Moved and held. In this state, when the next second object to be weighed is supplied to the receiving position E1 (E2), the first object to be weighed is held at the holding position H4 (H6) by the conveying operation of the standby conveyor 3a (3b). And the second object to be weighed moves to the holding position H3 (H5) and is held.

  In addition, in the combination process, the control unit 5 is to be weighed that is held at the holding positions H1 and H2 of the weighing conveyor 1 in addition to the objects that are held at the holding positions H3 to H6 of the standby conveyors 3a and 3b. Items are also selected for the discharge combination. That is, the combination processing here performs combination calculation based on the weight values of the objects to be weighed held in the weighing conveyors 1 and the standby conveyors 3a and 3b of all the weighing units Cw, and each of the weighing units Cw One combination of objects to be weighed selected from the above, and a combination of objects to be weighed in which the total weight (combination weight) is within the target weight range (allowable range for the combination target weight) Decide on a discharge combination (standard discharge combination). When there are a plurality of corresponding combinations, for example, the combination having the smallest absolute value of the difference between the combination weight and the combination target weight is determined as the discharge combination.

  When the object to be weighed at the holding position H1 of the weighing conveyor 1 is selected as the discharge combination, the object to be weighed at the holding position H1 is moved to the receiving position E1 of the standby conveyor 3a by the conveying operation in the right direction of the weighing conveyor 1. After being discharged, it is discharged to the discharge conveyor 21 by the leftward conveying operation of the standby conveyor 3a. In this case, each of the weighing conveyor 1 and the standby conveyor 3a is added with a conveying operation in the reverse direction immediately after the above-described conveying operation, and there is no object to be weighed at the holding position H1 of the weighing conveyor 1 from the state before the conveying operation. It becomes.

  When the object to be weighed at the holding position H2 of the weighing conveyor 1 is selected as the discharge combination, the object to be weighed at the holding position H2 is moved to the receiving position E2 of the standby conveyor 3b by the transporting operation of the weighing conveyor 1 in the left direction. After being discharged, it is discharged to the discharge conveyor 21 by the rightward conveying operation of the standby conveyor 3b. In this case, the standby conveyor 3b is added with a transport operation in the reverse direction immediately after the transport operation, and the object to be weighed at the holding position H1 of the weighing conveyor 1 is moved to the holding position H2 from the state before the transporting operation. The object to be weighed disappears in H1.

  When the object to be weighed at the holding position H3 (H5) of the standby conveyor 3a (3b) is selected as the discharge combination, the standby conveyor 3a (3b) is moved leftward (rightward), for example, twice the predetermined distance L2. By carrying out the conveying operation only, the object to be weighed at the holding position H3 (H5) is discharged to the discharge conveyor 21, and further, for example, by carrying out the carrying operation by a predetermined distance L2 in the reverse direction, the holding position H4 (H6) before discharging. The object to be weighed is stopped in a state where it has moved to the holding position H3 (H5). In this state, it waits for the next object to be weighed to be supplied from the weighing conveyor 1.

  When the object to be weighed at the holding position H4 (H6) of the standby conveyor 3a (3b) is selected as the discharge combination, the standby conveyor 3a (3b) is conveyed rightward (leftward), for example, by a predetermined distance L2. As a result, the object to be weighed at the holding position H4 (H6) is discharged to the discharge conveyor 22 (23), and further, for example, is transported in the reverse direction by a predetermined distance L2 and stopped. In this state, it waits for the next object to be weighed to be supplied from the weighing conveyor 1.

  Moreover, in this 2nd structural example, it replaces with the discharge apparatus 13 of a 1st structural example as a discharge device, and is provided with the discharge conveyors 21-24 which consist of a belt conveyor.

  The discharge device includes a discharge conveyor 21 that conveys objects to be measured discharged from the standby conveyors 3a and 3b toward the inside (center side) in one direction (arrow c direction), and an outward direction (rightward) from each of the standby conveyors 3a. A discharge conveyor 22 that conveys objects to be weighed discharged in the direction (c) in the direction of arrow c, and a discharge conveyor 23 which conveys objects to be weighed discharged from each standby conveyor 3b in the outer direction (left direction) in the direction of arrow c. The discharge conveyor 24 is configured to convey the objects to be weighed conveyed from the discharge conveyors 21 to 23 in the direction of the arrow d. The objects to be weighed discharged from the discharge conveyor 24 are supplied to a subsequent apparatus such as a packaging machine.

  Other configurations and operations are substantially the same as those of the first configuration example, and the description thereof is omitted. Also in this second configuration example, the same effects as in the first configuration example can be obtained.

In the second configuration example, each weighing unit Cw holds two objects to be weighed on the weighing conveyor 1 and each of the standby conveyors 3a and 3b so that each weighing object can be discharged individually. Therefore, in each weighing unit Cw, the weight values of the six objects to be weighed on the weighing conveyor 1 and the standby conveyors 3a and 3b can be used for the combination calculation. For example, four weighing units Cw are used as in this example. If provided, the number of combinations of 6 ⁴ (= 1296) is obtained, and a very good combination accuracy is obtained. Moreover, even when it is set as the structure provided with the three measurement parts Cw, the number of combinations of 6 ³ (= 216) is obtained, and the outstanding combination precision is obtained. Therefore, the number of weighing parts Cw can be further reduced.

  Further, in the configuration including the weighing unit Cw in the second configuration example, in the unlikely event that a discharge combination (standard discharge combination) is not required in the combination processing described above (in the case of a combination failure), that is, all the weighing units If there is a combination of objects to be weighed one by one from each of Cw and there is no combination whose total weight is within the target weight range, at least two objects to be weighed from one weighing unit Cw Select the weighing object, and obtain the discharge combination (special discharge combination) without selecting the weighing object from the other weighing units Cw as many as the number of weighing units Cw from which the two objects are selected. It may be. Here, the weighing unit Cw in which two objects to be weighed are selected is referred to as a weighing unit CwA, and the other weighing unit Cw in which no object to be weighed is selected is referred to as a weighing unit CwX. The weighing unit CwA and the weighing unit CwX are the same number (the same number).

  That is, the special discharge combination is one from each of the remaining weighing units Cw excluding the two weighing items selected from at least one weighing unit CwA and the weighing unit CwA and the other weighing units CwX. A combination of objects to be weighed one by one and a total weight within a target weight range. When obtaining this special discharge combination, for example, first, the special discharge combination is obtained by setting the number of each of the weighing unit CwA and the weighing unit CwX to be one, and in this case, if the special discharge combination cannot be obtained, It is preferable that the number of each of the part CwA and the weighing part CwX is two and the special discharge combination is obtained.

  When a special discharge combination is required, the weighing unit CwX in which the object to be weighed is not selected as the discharge combination is weighed when the object to be weighed is discharged from the other weighing unit Cw (including the weighing unit CwA). Either one of the objects to be weighed out of the holding positions H1 and H2 is discharged from the conveyor 1 to the receiving positions E1 and E2 of the standby conveyors 3a and 3b, and is held at the receiving positions E1 and E2. For example, when the weighing object at the holding position H2 is discharged from the weighing conveyor 1 to the receiving position E2 of the waiting conveyor 3b, the waiting conveyor 3b is in a state where three weighing objects are held, and the weighing conveyor 1 The object to be weighed at the holding position H1 (supply position) moves to the holding position H2, and there is no object to be weighed at the holding position H1, so that the next object to be weighed can be supplied. When the weighing object at the holding position H1 is discharged from the weighing conveyor 1 to the receiving position E1 of the standby conveyor 3a, the waiting conveyor 3a holds three objects to be measured. Since the object to be weighed at the holding position H2 moves to the holding position H1, the next object to be weighed can be received by further moving in the opposite direction so that there is no object to be weighed at the holding position H1. it can.

  In the weighing unit CwA in which two objects to be weighed are selected and discharged, there are no objects to be weighed on the weighing conveyor 1 and a total of four objects to be weighed are held on the standby conveyors 3a and 3b. Wait for the next sample to be weighed.

  In the next combination process, a third discharge combination is obtained. When obtaining this third discharge combination, select two objects to be weighed from the weighing unit CwX for which the object to be weighed was not selected for the previous special discharge combination, and two objects to be weighed for the previous special discharge combination. Is not selected from the selected weighing unit CwA, and one to-be-measured item is selected from each of the remaining weighing units Cw excluding the weighing unit CwX and the weighing unit CwA. Thus, a combination whose total weight falls within the target weight range is obtained, and if there is such a combination, it is determined as a discharge combination (third discharge combination). If there is no corresponding combination, a standard discharge combination for selecting the objects to be weighed one by one from all the weighing units Cw is obtained, and the same processing is performed in the next combination processing. When obtaining the third discharge combination, two weighing objects are selected from the weighing unit CwX. At this time, three weighing objects on the standby conveyor holding the three weighing objects of the weighing unit CwX are selected. Two objects to be weighed are selected so as to include either one of the objects to be weighed at both ends.

  By performing the above processing and operation, even if a combination failure in which a standard discharge combination cannot be obtained occurs, the operation of the combination weigher is continued by obtaining a special discharge combination, and each weighing unit Cw On the other hand, it is possible to continue the supply operation of supplying the objects to be weighed one by one.

  In the second configuration example, the discharge conveyors 21 to 24 are used as the discharge devices. For example, only one holding position (for example, the holding positions H3 and H5) of the standby conveyors 3a and 3b is used as the discharge device. It is good also as a structure provided only with the center discharge | emission conveyor 21 (this structure is hereafter called a "modification").

In this case, all objects to be weighed selected for the discharge combination are discharged to the discharge conveyor 21. In the combination processing, the weight values of a total of four objects to be weighed on the weighing conveyor 1 and the standby conveyors 3a and 3b can be used for combination calculation in each weighing unit Cw. For example, four weighing units Cw are provided. Then, 4 ⁴ (= 256) combinations are obtained, and excellent combination accuracy is obtained.

  Further, in plan view, the weighing conveyor 1 of each weighing unit Cw and the standby conveyors 3a, 3b are arranged so that the machine length direction is the same direction, and all the weighing conveyors 1 are arranged in parallel, It is possible to shorten the length in the front-rear direction of the weighing unit Cw group by reducing the distance between the weighing units Cw adjacent to each other. Accordingly, it is easy to perform the operation of supplying the objects to be weighed, and the discharge conveyor 21 can be shortened to shorten the discharge time.

  Moreover, since the discharge device is configured by only one discharge conveyor 21, the discharge device can be configured simply. Further, the length of the standby conveyors 3a and 3b can be shortened.

In the first configuration example described above, instead of the discharge conveyors 13a and 13b, only the central discharge conveyor 21 is provided as the discharge device in the same manner as the above-described modification, and the holding positions of the standby conveyors 3a and 3b are set to 1. It is good also as only one (for example, holding position H3, H5). In this case, in the combination processing, the weight values of a total of two objects to be weighed on the standby conveyors 3a and 3b can be used for the combination calculation in each weighing unit Cw. For example, eight weighing units Cw are provided. In this case, 2 ⁸ (= 256) combinations are obtained, and excellent combination accuracy is obtained.

[Third configuration example]
FIG. 5A is a schematic plan view of the combination weigher according to the third configuration example of the embodiment of the present invention as viewed from above, and FIG. 5B is a schematic diagram of the combination weigher as viewed from the side. .

  In this third configuration example, each weighing conveyor 1 has one holding position H1 for holding an object to be measured, the arrangement of the weighing conveyor 1 and the standby conveyors 3a and 3b in each weighing unit Cw, and Except for the disposition of each weighing unit Cw and the discharge conveyors 21 to 23, the configuration is the same as that of the second configuration example described above.

  In the third configuration example, two weighing units Cw are arranged between the discharge conveyor 21 and the discharge conveyor 22 and between the discharge conveyor 21 and the discharge conveyor 22.

  In each weighing section Cw between the discharge conveyor 21 and the discharge conveyor 22, the two standby conveyors 3 a and 3 b are arranged in parallel to each other, one end thereof faces the discharge conveyor 21, and the other end is the discharge conveyor 22. It is arranged to face. Similarly, in each weighing section Cw between the discharge conveyor 21 and the discharge conveyor 23, the two standby conveyors 3a and 3b are arranged in parallel to each other, one end of the respective conveyor faces the discharge conveyor 21, and the other end is It arrange | positions so that the discharge conveyor 23 may be faced.

  In each weighing unit Cw, the weighing conveyor 1 is disposed above the two standby conveyors 3a and 3b. The weighing conveyor 1 and the standby conveyors 3a and 3b are arranged so that their machine length directions (conveying directions) are orthogonal to each other, one end of the weighing conveyor 1 faces the standby conveyor 3a, and the other end of the weighing conveyor 1 is the standby conveyor 3a. It is arranged to face. Each of the standby conveyors 3a and 3b is arranged such that the three discharge conveyors 21 to 23 arranged in parallel and the machine length direction (conveying direction) are orthogonal to each other.

  In each weighing section Cw, only one object to be weighed is held on the weighing conveyor 1 at its supply position (holding position H1), so that the weighing conveyor 1 holds the objects to be weighed on the standby conveyors 3a and 3b. Is in a stopped state, except for the case where the objects to be weighed on the weighing conveyor 1 are selected as the discharge combination, and the holding position as in the second configuration example described above. The operation of transporting the object to be weighed in H1 to the holding position H2 is not necessary.

  The operations of the standby conveyors 3a and 3b when the objects to be weighed are supplied from the weighing conveyor 1 and when the objects to be weighed are discharged to the discharge conveyors 21 to 23 are the same as those in the second configuration example.

  In this third configuration example, when an object to be weighed at the holding position H1 of the weighing conveyor 1 is selected as the discharge combination, the objects to be weighed on the weighing conveyor 1 are received at the receiving position E1 of the waiting conveyor 3a and the waiting conveyor 3a. It may be discharged to the discharge conveyor 21 through any position with the receiving position E2.

In this third configuration example, each weighing unit Cw holds one object to be weighed on the weighing conveyor 1 and holds two objects to be weighed on each of the standby conveyors 3a and 3b. Since each item can be discharged individually, and the discharge combination is selected from the weight values of all the objects to be weighed in the same manner as in the combination process in the second configuration example, the weighing conveyor 1 and the standby in each weighing unit Cw The weight values of the five objects to be weighed on the conveyors 3a and 3b can be used for the combination calculation. For example, if four weighing units Cw are provided as in this example, 5 ⁴ (= 625) ways. The number of combinations is obtained and very good combination accuracy is obtained.

  In the third configuration example, the weighing conveyor 1 and the standby conveyors 3a and 3b of each weighing unit Cw are arranged as described above, so that, for example, as in the second configuration example, the weighing conveyor 1 and the standby conveyor 3a, Since the object to be weighed does not pass through 3b and is not discharged, the level difference between the weighing conveyor 1 and the standby conveyors 3a and 3b can be reduced. Moreover, the weight sensor 2 attached below the weighing conveyor 1 does not affect the arrangement of the discharge conveyors 21 to 23, and the step between the standby conveyors 3a and 3b and the discharge conveyors 21 to 23 can be reduced. Further, depending on the objects to be weighed, it is possible to eliminate the step so that the transport surfaces of the weighing conveyor 1, the standby conveyors 3a and 3b, and the discharge conveyors 21 to 23 are on the same horizontal plane. As described above, since the level difference between the conveyors can be reduced or eliminated, it is possible to prevent damage to an object that is easily damaged by an impact at the time of dropping or the like, and to reduce the height of the combination weigher. I can.

  Further, in the third configuration example, as in the second configuration example, the weighing conveyor 1 having a long captain may be used to hold two objects to be weighed on the weighing conveyor 1.

  Also in the second configuration example described above, as in the third configuration example, it may be configured such that only one object to be weighed is held on the weighing conveyor 1.

In the third configuration example, similarly to the modification in the second configuration example, each of the standby conveyors 3a and 3b has only one holding position (for example, holding positions H3 and H5), and the central discharge is performed as a discharge device. It is good also as a structure provided only with the conveyor 21. FIG. In this case, in the combination process, the weight values of the three objects to be weighed on the weighing conveyor 1 and the standby conveyors 3a and 3b can be used for the combination calculation in each weighing unit Cw. For example, five weighing units If Cw is provided, 3 ⁵ (= 243) combinations can be obtained, and excellent combination accuracy can be obtained.

  Also in the third configuration example, when a combination failure occurs, a special discharge combination is obtained in the same manner as in the second configuration example, and the weighing conveyor 1 of the weighing unit Cw not selected as the special discharge combination is covered. The weighing object can be supplied to the weighing conveyor 1 by being discharged to the receiving positions E1 and E2 of one of the standby conveyors 3a and 3b and held at the receiving positions E1 and E2. In addition, the operation of the combination weigher can be continued, and the supply operation of supplying the objects to be weighed one by one to each weighing unit Cw can be continued.

  Also in the first configuration example, when a combination failure occurs, a special discharge combination is obtained in the same manner as in the second configuration example, and the weighing conveyor 1 of the weighing unit Cw not selected as the special discharge combination is covered. The weighing object may be retracted to a position different from the supply position (holding position H1) on the weighing conveyor 1 so that the next weighing object can be supplied (the next weighing object). 2), two objects to be weighed are placed on the weighing conveyor 1). Alternatively, any one of the standby conveyors 3a and 3b may be loaded with three objects to be weighed, and the objects to be weighed on the weighing conveyor 1 may be moved to any of the standby conveyors 3a and 3b. . The same applies to the fourth configuration example described below.

[Fourth configuration example]
FIG. 6A is a schematic plan view of the fourth combination example of the embodiment of the present invention as seen from above, and FIG. 6B is a schematic diagram of the combination scale as seen from the side. .

  This combination weigher includes a plurality of weighing units Cw, a discharge device 13, an operation indicator 4, a control unit 5 and the like similar to those of the first configuration example.

  Each weighing unit Cw includes a weighing conveyor device having a weighing conveyor 1 and a weight sensor 2, and a plurality of standby conveyors 3c, 3d, and 3e. The weighing conveyor 1 and the weight sensor 2 are the same as those in the first configuration example. Each of the plurality of standby conveyors 3c, 3d, and 3e is constituted by a belt conveyor, which is basically the same as the standby conveyors 3a and 3b in the first configuration example, but the standby conveyors 3c and 3d in the fourth configuration example. Each of 3e is configured to hold one object to be weighed. The transport operation of the weighing conveyor 1 and the standby conveyors 3c, 3d, and 3e is controlled by the control unit 5.

  As shown in FIG. 6B, each weighing unit Cw of the fourth configuration example has a standby conveyor 3c disposed obliquely below the weighing conveyor 1, and a standby conveyor 3d disposed obliquely below the standby conveyor 3c. Further, a standby conveyor 3e is disposed obliquely below the standby conveyor 3d. The objects to be weighed P supplied to the weighing conveyor 1 and weighed are supplied to the respective standby conveyors 3c, 3d and 3e. Specifically, the objects to be weighed P measured by the weighing conveyor 1 are discharged from the left end of the weighing conveyor 1 by the conveying operation in the left direction of the weighing conveyor 1 and dropped to be supplied to the standby conveyor 3c. In addition, the objects to be weighed P on the standby conveyor 3c are discharged from the left end of the standby conveyor 3c by the conveying operation in the left direction of the standby conveyor 3c, are dropped, and are supplied to the standby conveyor 3d. In addition, the objects P to be weighed on the standby conveyor 3d are discharged from the left end of the standby conveyor 3d by the conveying operation in the left direction of the standby conveyor 3d, dropped, and supplied to the standby conveyor 3e.

  In the combination process, the control unit 5 selects the discharge combination from the weighed objects held by the weighing conveyors 1 and the standby conveyors 3c, 3d, and 3e of all the weighing units Cw. That is, combination calculation is performed based on the weight values of the objects to be weighed held in the weighing conveyors 1 and the standby conveyors 3c, 3d, and 3e of all the weighing units Cw, and one is selected from each of all the weighing units Cw. One combination of the objects to be weighed and whose total weight (combination weight) falls within the target weight range (allowable range for the combination target weight) is determined and determined as the discharge combination. When there are a plurality of corresponding combinations, for example, the combination having the smallest absolute value of the difference between the combination weight and the combination target weight is determined as the discharge combination.

  In each weighing section Cw, when the object to be weighed on the weighing conveyor 1 is selected as the discharge combination, the weighing conveyor 1 is dropped from the right end of the weighing conveyor 1 by the rightward conveying operation and discharged to the discharge conveyor 13a. The Similarly, when the objects to be weighed in the standby conveyors 3c, 3d, and 3e are selected as the discharge combination, the standby conveyors 3c, 3d, and 3e are moved from the right end of the standby conveyors 3c, 3d, and 3e by the rightward conveying operation. It falls and is discharged to the discharge conveyor 13a.

  In the control unit 5, when the objects to be weighed on the lower conveyors (3c, 3d, 3e) are discharged, the objects to be weighed P are sequentially supplied from the upper conveyors (1, 3c, 3d). 1 and standby conveyors 3c, 3d and 3e are controlled.

  In addition, the discharge conveyor 13a is disposed with an inclination so that the falling distances of the objects to be weighed P falling from the weighing conveyor 1 and the standby conveyors 3c, 3d, and 3e to the discharge conveyor 13a are the same or substantially the same. May be. For example, as shown in FIG. 6B, when the conveyors from the lowermost standby conveyor 3e to the uppermost weighing conveyor 1 are arranged to rise to the right, the discharge conveyor 13a is inclined to the right. Hold and place. Thereby, the impact at the time of the to-be-measured object P falling to the discharge conveyor 13a can be made small, and the breakage of the to-be-measured object P by the impact at the time of dropping, and the failure of the discharge conveyor 13a can be prevented. At this time, by providing a bar or the like on the discharge conveyor 13a, it is possible to prevent the object to be weighed from falling even if the object to be weighed easily rolls.

In the case of this fourth configuration example, in the combination processing, the weight values of the four objects to be weighed on the weighing conveyor 1 and the standby conveyors 3c, 3d, 3e can be used for the combination calculation in each weighing unit Cw. If four weighing units Cw are provided, 4 ⁴ (= 256) combinations can be obtained, and excellent combination accuracy can be obtained.

In each weighing unit Cw, three standby conveyors 3c, 3d, and 3e are provided, but one or more standby conveyors may be provided. For example, when only one standby conveyor 3c is provided, the weight values of the two objects to be weighed on the weighing conveyor 1 and the standby conveyor 3c can be used for the combination calculation in each weighing unit Cw. If eight weighing units Cw are provided, 2 ⁸ (= 256) combinations can be obtained, and excellent combination accuracy can be obtained.

Further, in the fourth configuration example, the discharge combination may be obtained without using the objects to be weighed on the weighing conveyor 1 as targets of the discharge combination. In this case, the weight values of the three objects to be weighed on the standby conveyors 3c, 3d, and 3e can be used for the combination calculation. For example, if five weighing units Cw are provided, 3 ⁵ (= 243) ways The number of combinations is obtained, and excellent combination accuracy is obtained. In this case, the weighing conveyor 1 only needs to perform a leftward conveying operation in order to supply the objects to be weighed to the standby conveyor 3c.

In the fourth configuration example, when the objects to be weighed on the weighing conveyor 1 are not targeted for discharge combination, it is only necessary to provide two or more standby conveyors in each weighing unit Cw. For example, when only two standby conveyors 3c and 3d are provided, the weight value of two objects to be weighed on the standby conveyors 3c and 3d can be used for the combination calculation in the combination processing, for example, 8 2 ⁸ (= 256) combinations can be obtained, and excellent combination accuracy can be obtained.

  Further, as described above, when the objects to be weighed on the weighing conveyor 1 are not targeted for discharge combination, two objects to be weighed are provided below the weighing conveyor 1, for example, the standby conveyors 3 a and 3 b in the first configuration example. A single standby conveyor for holding objects may be provided. Also in this case, for example, if eight weighing units Cw are provided, excellent combination accuracy can be obtained.

  In the fourth configuration example, standby conveyors 3c, 3d, and 3e are provided below one side (left side) of the weighing conveyor 1, but similarly, standby is also performed below the other side (right side) of the weighing conveyor 1. One or more conveyors may be provided. In this case, an object to be weighed on the weighing conveyor 1 may be selected as a discharge combination selection target, or may not be a discharge combination selection target. When the object to be weighed on the weighing conveyor 1 is to be selected as a discharge combination, the object to be weighed on the weighing conveyor 1 is discharged via either the left or right standby conveyor adjacent to the weighing conveyor 1. Good.

  As shown in each of the above configuration examples, in the present embodiment, since one object to be weighed is selected as the discharge combination from all the weighing units Cw, the objects to be weighed selected as the discharge combination are discharged. What is necessary is just to supply a to-be-measured object one by one to the measurement conveyor 1 of all the measurement parts Cw whenever it is done. Therefore, the operator only needs to supply the objects to be weighed to all the weighing conveyors 1 every time the objects to be weighed selected for the discharge combination are discharged, and the supply work can be performed uniformly. It is possible to reduce the burden on the operator because there is no need to search for the weighing conveyor 1 to which the objects to be weighed are supplied.

  In this embodiment, since a plurality of weight values used for the combination calculation are obtained in each weighing unit Cw, the number of weighing units Cw for obtaining a desired combination accuracy is reduced to suppress an increase in manufacturing cost and a combination weigher. Therefore, the installation area can be reduced. Further, since the combination scale can be made compact by reducing the number of weighing units Cw, it is possible to reduce the burden on the operator who supplies the objects to be weighed to the weighing conveyor 1.

  In the present embodiment, the combination process is performed when the discharge command signal is input from the subsequent apparatus, but the present invention is not limited to this. For example, when a combination process is performed at a predetermined time interval set in advance and a discharge command signal is input, the conveyor and the discharge device in which the held objects are selected as the discharge combination are driven to change the objects to be weighed. You may make it discharge | emit to a back | latter stage apparatus. In addition, when the discharge command signal is not input from the subsequent device, or when there is no subsequent device and another worker receives the object to be discharged from the discharge device, the combination is made at a predetermined time interval set in advance. Processing may be performed.

Further, in the present embodiment, each weighing unit Cw is configured so as to obtain the weight value of a plurality (m) of objects to be used for combination calculation, and an appropriate plurality (k) weighing units. By providing Cw, the number of combinations increases, and the desired excellent combination accuracy can be obtained. For example, the values of m and k so that m ^k ≧ 200, that is, the number of objects to be weighed that are to be selected for the discharge combination among the objects to be weighed on the weighing conveyor and the standby conveyor in each weighing unit Cw. (M) and the number (k) of the weighing units Cw may be set. Here, for example, in the case where each weighing object P is composed of a single article and k bagged products are produced, the number of weighing units Cw is the number of weighing objects P to be packaged (k pieces). In this case, in order to obtain the desired combination accuracy, in each weighing unit Cw, the number of objects to be weighed (m pieces) used for the combination calculation is set, and the m pieces are set. Each weighing unit Cw may be configured so that the weight value of the object to be weighed can be obtained.

In the present embodiment, each weighing unit Cw is provided with a standby conveyor for holding the objects to be weighed by the weighing conveyor 1, but each weighing unit Cw is used in, for example, the second configuration example shown in FIG. It may be configured only by the weighing conveyor 1 and the weight sensor 2 that hold the two objects to be weighed. In this case, there is no standby conveyor, and in each weighing unit Cw, the weight values of two objects to be weighed on the weighing conveyor 1 can be used for combination calculation. For example, if eight weighing units Cw are provided, The number of combinations of 2 ⁸ (= 256) is obtained, and excellent combination accuracy is obtained. Also in this configuration, when a combination failure occurs, a special discharge combination is obtained in the same manner as in the second configuration example, and the objects to be weighed on the weighing conveyor 1 of the weighing unit Cw not selected as the special discharge combination are obtained. The weighing conveyor 1 is moved so as to move (retract) to a position different from the supply position (holding position H1) of the weighing conveyor 1 so that the next object to be weighed can be supplied. (When the next object to be weighed is supplied, three objects to be weighed are placed on the weighing conveyor 1). The discharge device only needs to be able to receive an object to be measured discharged from the weighing conveyor 1 and discharge it to an external rear-stage device or the like.

  Further, in the present embodiment, for example, when eight weighing units Cw are provided, every time the weighing object selected for the discharge combination is discharged, eight weighing objects are supplied each time. Become. When supplying a relatively large number of objects to be weighed in this way, the supply work may be performed by a plurality of workers. Moreover, you may use a supply apparatus like the after-mentioned.

  Moreover, in this embodiment, you may make it alert | report to a worker the timing which should supply a to-be-measured item. This notification means (supply timing notification means) may be any as long as it can notify the worker. For example, in each configuration example, an indicator lamp 12 corresponding to the holding position H1 of the weighing conveyor 1 is provided, and when the weighing conveyor 1 is in the conveyance stopped state by the control of the control unit 5, the holding position H1 of the weighing conveyor 1 is set. You may comprise so that the indicator lamp 12 may be lighted when the to-be-measured object does not exist. As a result, the operator only has to supply the object to be weighed in response to the lighting of the indicator lamp 12, so that the object to be weighed is placed at the confirmation position and holding position of the weighing conveyor 1 through the opening 11a. It is possible to easily supply the object to be weighed without confirming that it is not.

  In this embodiment, the operator supplies the objects to be weighed. However, the objects to be weighed may be supplied by a supply device (for example, an external transport device). In this case, the control unit 5 transmits, for example, a timing signal that informs the timing to supply the objects to be weighed to the weighing conveyor 1 to the supply device, and the supply device sends all the objects to be weighed to all the weighing units Cw based on the timing signals. Since only the operation of supplying one by one is repeated, the control of the supply device is simplified.

  Further, when a plurality of holding positions H1 and H2 are set on the weighing conveyor 1 as in the second configuration example, for example, the distribution apparatus shown in FIG. 7 moves the holding positions H1 and H2 of the weighing conveyors 1 to each other. You may comprise so that to-be-measured object may be supplied.

  FIG. 7 is a schematic diagram showing an example of a sorting device for sorting and supplying the objects to be measured to the two holding positions of the weighing conveyor 1. In the case of FIG. 7, one distribution device 50 is provided above each weighing conveyor 1 so as to correspond to each weighing conveyor 1. This distribution device 50 is configured by a hopper capable of temporarily holding an object to be weighed supplied from above and capable of discharging in two directions. That is, the distribution device 50 includes a cylindrical hopper body 51 and two discharge gates 52a and 52b that are attached to the hopper body 51, constitute the bottom surface of the hopper body 51, and can be opened and closed independently. Yes. The opening and closing operations of the first and second discharge gates 52a and 52b are controlled by the control unit 5.

  In the control unit 5, for example, when discharging the measurement object P at the first holding position H1 of the weighing conveyor 1, the weighing conveyor 1 is transported to the right by a predetermined distance L1 and stopped. Then, the object P to be weighed at the second holding position H2 is transferred to the first holding position H1, and there is no object to be weighed at the second holding position H2, so that the control unit 5 opens the second discharge gate 52b of the distribution device 50. By opening and closing, the object to be weighed in the sorting device 50 is supplied to the second holding position H2. In this way, the control unit 5 controls the discharge gates 52a and 52b so that the weighing object P is supplied to the holding positions H1 and H2 where the weighing object P is not present when the weighing conveyor 1 is in the transport stop state.

  When there is no object to be weighed in both the holding positions H1 and H2, the control unit 5 determines a predetermined supply order (for example, the first is the holding position H1 and the second is the holding position H2). Thus, the sorting device 50 is supplied with the objects to be weighed.

  As described above, when the sorting device 50 is used, it is possible to supply the objects to be weighed to both the holding positions H1 and H2 while keeping the weighing conveyor 1 in the conveyance stopped state. The transport operation can be easily controlled.

  The supply of the objects to be weighed to the distribution device 50 may be performed by an operator, or a supply device for supplying the objects to be weighed to the distribution device 50 may be provided and performed by this supply device.

  In each configuration example in the present embodiment, in a plan view, the weighing conveyor and the standby conveyor of each weighing unit Cw are arranged in a straight line (FIGS. 1A, 4A, and 6A). )) And the arrangement in which the conveying directions of the weighing conveyor and the standby conveyor are orthogonal to each other (FIG. 5A), but the conveying direction of the weighing conveyor and the conveying direction of the standby conveyor are not orthogonal. You may be comprised so that it may cross | intersect and arrange | position.

  In this embodiment, a belt conveyor is used as the weighing conveyor and the standby conveyor. However, a roller conveyor or the like may be used depending on the type of objects to be weighed. Further, a chute or the like may be used for the discharge device.

  INDUSTRIAL APPLICABILITY The present invention is useful as a combination weigher or the like that can uniformly perform an operation of supplying an object to be weighed by a worker or a supply operation by a supply device for all weighing units.

Cw Weighing section H1 to H6 Holding position 1 Weighing conveyor 2 Weight sensors 3a to 3e Standby conveyor 4 Operation indicator 5 Control section 13 Discharge device 50 Sorting device 51 Hopper body 52a, 52b Discharge gate

Claims (9)

A weighing conveyor that temporarily holds the objects to be weighed and can transport the held objects to be measured in two directions opposite to each other;
A weight sensor for weighing the object to be weighed on the weighing conveyor;
The objects to be weighed are arranged on both ends of the weighing conveyor and weighed on the weighing conveyor, and a plurality of objects to be weighed are held at different positions, and the held objects to be weighed are mutually connected. A plurality of weighing units having two standby conveyors capable of transporting in two opposite directions, and
A combination of objects to be weighed selected from each of all the weighing units, and the total weight is within the target weight range among the objects to be weighed held on the standby conveyor. A combination means for obtaining a discharge combination comprising a combination of objects to be weighed;
And a conveyor control means for transporting the standby conveyor so as to discharge only the objects to be weighed selected for the discharge combination. In the plan view, all the weighing conveyors are arranged in parallel in a direction orthogonal to the machine length direction, and in each weighing unit, the machine length directions of the weighing conveyor and the two standby conveyors are flat. Arranged in the same direction in view,
The combination weigher according to claim 1 . In each of the weighing units, the two standby conveyors are arranged in parallel in a plan view, and the weighing conveyor is arranged between the two standby conveyors so that the standby conveyor and the machine direction are orthogonal to each other. The
The combination weigher according to claim 1 . The combination means includes
It is configured to obtain the discharge combination from the objects to be weighed held on the weighing conveyor and the standby conveyor,
The conveyor control means
The weighing conveyor and the standby conveyor are transported so as to discharge only the objects to be weighed selected for the discharge combination, and at this time, the objects selected by the discharge combination and held on the weighing conveyor. The weighing object is configured to transport the weighing conveyor and the standby conveyor so as to be discharged through the standby conveyor.
The combination balance according to any one of claims 1 to 3 . The standby conveyor, when receiving and holding an object to be weighed supplied from the weighing conveyor, is held at a position away from a receiving position for receiving the object to be weighed, selected as the discharge combination, and the weighing conveyor The combination weigher according to claim 4, wherein the weighing object discharged from the container is discharged after being received at the receiving position. The weighing conveyor is configured to temporarily hold each of the objects to be weighed supplied at different timings at each of a plurality of holding positions determined at predetermined intervals in the conveyance direction,
Further comprising weight calculation means for calculating the weight of the object to be weighed held at each of the holding positions based on the measurement value of the weight sensor.
The combination weigher according to claim 4 . The combination means includes
When the discharge combination cannot be obtained, two objects to be weighed are selected from at least one of the weighing parts, and the same number as the number of the weighing parts from which the two objects to be weighed are selected. It is a combination of objects to be weighed that are selected one by one from the remaining weighing units, and the total weight is within the target weight range. Configured to require a special discharge combination consisting of a combination of weighing items,
The conveyor control means
When the combination means determines the special discharge combination, the object to be weighed selected by the special discharge combination is discharged and the measurement object held by the measurement conveyor of the other measurement unit Configured to control the weighing conveyor to move objects from its held position to another position on the weighing conveyor or onto the standby conveyor;
The combination weigher according to claim 1 . A weighing conveyor for temporarily holding the supplied objects to be weighed and conveying the held objects to be weighed;
  A weight sensor for weighing the object to be weighed on the weighing conveyor;
  One or more standby conveyors to which the objects to be weighed on the weighing conveyor are supplied and temporarily hold the supplied objects to be weighed;
  A plurality of measuring units having
  In each of the weighing units, the total number of objects to be weighed held by all the standby conveyors is configured to be 2 or more,
  A combination of objects to be weighed selected from each of all the weighing units and selected from objects to be weighed held on the standby conveyor, and the total weight is within the target weight range. A combination means for obtaining a discharge combination comprising a combination of objects to be weighed,
  Conveyor control means for transporting the standby conveyor so as to discharge only the objects to be weighed selected for the discharge combination,
  The combination means includes
  When the discharge combination cannot be obtained, two objects to be weighed are selected from at least one of the weighing parts, and the same number as the number of the weighing parts from which the two objects to be weighed are selected. It is a combination of objects to be weighed that are selected one by one from the remaining weighing units, and the total weight is within the target weight range. Configured to require a special discharge combination consisting of a combination of weighing items,
  The conveyor control means
  When the combination means determines the special discharge combination, the object to be weighed selected by the special discharge combination is discharged and the measurement object held by the measurement conveyor of the other measurement unit Configured to control the weighing conveyor to move objects from its held position to another position on the weighing conveyor or onto the standby conveyor;
  Combination scale. A weighing conveyor for temporarily holding the supplied objects to be weighed and conveying the held objects to be weighed;
  A weight sensor for weighing the object to be weighed on the weighing conveyor;
  One or more standby conveyors to which the objects to be weighed on the weighing conveyor are supplied and temporarily hold the supplied objects to be weighed;
  A plurality of measuring units having
  A combination of objects to be weighed, one selected from each of all the weighing units, and selected from the objects to be weighed held on the weighing conveyor and the standby conveyor, and the total weight is A combination means for obtaining a discharge combination comprising a combination of objects to be weighed within a target weight range;
  Conveyor control means for transporting the weighing conveyor and the standby conveyor so as to discharge only the objects to be weighed selected in the discharge combination,
  The combination means includes
  When the discharge combination cannot be obtained, two objects to be weighed are selected from at least one of the weighing parts, and the same number as the number of the weighing parts from which the two objects to be weighed are selected. It is a combination of objects to be weighed that are selected one by one from the remaining weighing units, and the total weight is within the target weight range. Configured to require a special discharge combination consisting of a combination of weighing items,
  The conveyor control means
  When the combination means determines the special discharge combination, the object to be weighed selected by the special discharge combination is discharged and the measurement object held by the measurement conveyor of the other measurement unit Configured to control the weighing conveyor to move objects from its held position to another position on the weighing conveyor or onto the standby conveyor;
  Combination scale.

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