JP5825970B2 - Combination weigher and supply device used therefor - 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 and a supply device used therefor.

  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. Is configured to discharge.

  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 the configuration of Patent Document 1, one weighing object is supplied to each weighing conveyor, and the weight value of the weighing object obtained from each weighing conveyor is one, and one weight value for each weighing conveyor. However, it can only be used for combination calculations.

  Further, in the configuration of Patent Document 2, two objects to be weighed (an upstream object to be weighed and a downstream object to be weighed) are supplied to stay on each weighing conveyor, and two weights are used for the combination calculation. A value can be used. However, in this case, since each weighing conveyor is configured to convey and discharge the objects to be measured in only one direction, the weight value of the object to be weighed upstream of the two objects to be measured is used alone for the combination calculation. It is not possible. That is, for each weighing conveyor, it is not possible to select a combination that does not include downstream objects and includes upstream objects.

  In combination weighers, it is known that the number of weight values used for combination calculation may be increased in order to improve combination accuracy. For this purpose, it is necessary to increase the number of weighing units. However, for example, a weight sensor (load cell) used in a weighing conveyor is expensive, and increasing the number of weighing units increases the manufacturing cost and the device. It will also lead to an increase in the installation area. In addition, when supplying the objects to be weighed to the combination weigher manually (manually) by an operator, the burden on the operator is increased.

  In the configurations of Patent Documents 1 and 2 described above, there is room for improvement in terms of improving combination accuracy, suppressing an increase in manufacturing cost, and downsizing the apparatus.

  The present invention has been made in order to solve the above-mentioned problems, and a combination weigher capable of improving combination accuracy (combination weighing accuracy), suppressing an increase in manufacturing cost, and achieving compactness, and use thereof. It is an object to provide a supply device. It is another object of the present invention to provide a combination weigher that can reduce the burden on an operator who supplies an object to be weighed when the object to be weighed is supplied manually.

  In order to achieve the above object, a combination weigher according to an aspect of the present invention temporarily holds and holds each of the objects to be weighed at each of a plurality of holding positions determined in the conveyance direction. A plurality of weighing conveying means capable of conveying the measured objects in two directions opposite to each other, and each of the weighing objects provided on the weighing conveying means is provided corresponding to the weighing conveying means. Calculated by a plurality of weight sensors for weighing the weight, weight calculation means for calculating the weight of the object to be weighed held at each holding position based on the measurement value of the weight sensor, and the weight calculation means. A combination means for obtaining a discharge combination comprising a combination of objects to be weighed in which the total weight of the objects to be weighed is within a target weight range, and for the weighing to discharge only the objects to be weighed selected in the discharge combination. Operate the transport means And a conveyance control unit.

  According to this configuration, a plurality of holding positions can be determined for each weighing transport unit, and the objects to be weighed by each weighing transport unit can be transported and discharged in two directions opposite to each other. When obtaining the discharge combination, the number of combinations increases, and the combination accuracy can be improved. Therefore, the number of weighing means and weight sensors 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. In addition, since the combination weigher can be made compact by reducing the number of weighing means and weight sensors, the burden on the operator should be reduced when the operator supplies the objects to be weighed to the weighing means. Can do.

  Further, in each of the weighing transport means, one holding position 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. , When the object to be weighed is not held at the holding position other than the supply position, the object to be weighed supplied to the supply position is held at the position other than the supply position with respect to each of the weighing conveying means. You may be comprised so that it may convey to a position.

  According to this configuration, it is only necessary to supply an object to be measured to one holding position (supply position) with respect to each weighing transport unit having a plurality of holding positions. The burden on the operator can be further reduced.

  Further, an opening for supplying an object to be weighed may be provided above the supply position, and a cover for covering the upper side of the weighing transport unit may be further provided.

  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.

  Each of the weighing transport units may further include a supply timing notifying unit for notifying an operator of a timing at which the object to be weighed should be supplied to the supply position.

  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.

  Moreover, you may further provide the supply position change means for changing the said supply position.

  This configuration is useful because the supply position can be changed according to the standing position of the worker.

  Further, in each of the weighing conveying means, all the holding positions are predetermined as supply positions for supplying the objects to be weighed, and the objects to be weighed are manually or automatically supplied to the supply positions. May be.

  According to this configuration, since all the holding positions are the supply positions, it is possible to supply the objects to be weighed to all the holding positions while the weighing transport unit is stopped. It is easy to control the operation of the weighing transport means.

  Further, in each weighing section including the weighing conveying means and the weight sensor provided corresponding to each other, the weighing object immediately after the object to be weighed is discharged from the weighing conveying means and the driving is stopped. An abnormality determination unit that determines whether or not the weighing unit is abnormal based on a measurement value of the weight sensor corresponding to the conveyance unit may be further provided.

  According to this configuration, when the measuring unit is abnormal, for example, by stopping the operation of the combination weigher, it is possible to prevent a measurement-defective product from being supplied to the subsequent apparatus.

  Moreover, you may provide further the abnormality alerting | reporting means which alert | reports the said measurement part which is abnormal based on the determination result by the said abnormality determination means to an operator.

  According to this configuration, when the measuring unit is abnormal, the operator can perform necessary measures.

  Further, the apparatus may further include a discharge device that conveys and discharges the object to be weighed discharged from the weighing transport means, and has both edges of the transport surface higher than the central portion.

  According to this configuration, since the objects to be weighed discharged from each weighing transport means are transported in a state where they are located at the bottom of the central portion lower than both edges of the discharge device, the width direction of the discharge device (transport The object to be weighed can be prevented from being scattered in the direction orthogonal to the direction), and the object to be weighed can be accurately supplied to the subsequent apparatus. When the object to be weighed has a rod shape or an elongated shape, the object to be weighed is transported in a state lying on the bottom of the center part, and the longitudinal direction of the object to be weighed is the same as the transport direction of the discharge device. It can be discharged together.

  In addition, among the plurality of weighing units each including the weighing conveying means and the weight sensor provided in correspondence with each other, one weighing unit is a weighing object having a larger weight than the other weighing units. The weighing means is configured to measure and convey, and the combination means is configured to obtain the discharge combination so that an object to be weighed held on the weighing conveyance means of the one weighing unit is always selected. It may be.

  Such a configuration is suitable when the combination target weight is large, in other words, when the total weight of the objects to be weighed selected for the discharge combination is large.

  Further, in each of the weighing conveying means, two adjacent holding positions are predetermined as supply positions for supplying the objects to be weighed, and for supplying the objects to be weighed to each of the two supply positions. A first discharge used above and disposed above each of the weighing conveying means to temporarily hold the supplied weighing object and to supply the weighing object to one of the two supply positions. You may further provide the some supply apparatus comprised so that it might have a gate and the 2nd discharge gate for supplying a to-be-measured item to the other.

  According to this configuration, the object to be weighed can be automatically supplied to the two supply positions of the weighing conveying means.

  Further, the supply device according to an aspect of the present invention temporarily holds each of the objects to be weighed in each of a plurality of holding positions defined in the transport direction, and the held objects to be weighed in opposite directions. To supply an object to be weighed to a weighing and conveying apparatus having a plurality of weighing and conveying means capable of being conveyed in a certain two directions and a weight sensor for measuring the weight of the object to be weighed on the weighing and conveying means. A first discharge unit disposed above the weighing transport unit for temporarily holding the supplied object to be measured and supplying the object to be measured to one of the two adjacent holding positions; It has a gate and a second discharge gate for supplying an object to be weighed to the other.

  According to this configuration, the object to be weighed can be automatically supplied to the two holding positions of the weighing conveying means.

  The present invention has the above-described configuration, and in the combination weigher, there are the effects that the combination accuracy is improved, the increase in manufacturing cost is suppressed, and the size can be reduced. In addition, when the object to be weighed is manually supplied, the burden on the operator who supplies the object to be weighed can be reduced.

(A) is the schematic plan view which looked at the combination weigher of the one structural example of embodiment of this invention from the top, (b) is the schematic schematic diagram which looked at the combination weigher from the side. It is a block diagram which shows schematic structure of the combination weigher of the example of 1 structure of embodiment of this invention. (A), (b) is a flowchart which shows an example of operation | movement of the combination weigher of the example of 1 structure of embodiment of this invention. It is a figure which shows the other example of the discharge device of the combination scale of the example of 1 structure of embodiment of this invention. It is a figure which shows another example of the discharge device of the combination scale of the example of 1 structure of embodiment of this invention. (A) is the schematic diagram which looked at the principal part of the combination weigher using another another discharge apparatus from the side in the combination weigher of the example of 1 composition of the embodiment of the present invention, and (b) It is the schematic plan view which looked at the principal part of the combination scale from the top. It is a figure which shows an example of the supply 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 example, as illustrated in FIGS. 1A and 1B, for the sake of convenience, the arrow a direction side is described as the “right” side, and the arrow b direction side is described as the “left” side.

(Embodiment)
FIG. 1A is a schematic plan view of a combination weigher according to an embodiment of the present invention as viewed from above, and FIG. 1B is a schematic diagram of the combination weigh as viewed from the side. FIG. 2 is a block diagram showing a schematic configuration of a combination weigher of one configuration example of the embodiment of the present invention.

  This combination weigher includes a plurality of weighing units Cw, a discharge device 3, an operation indicator 4, a control unit 5, and the like.

  Each weighing section Cw is constituted by a weighing and conveying device having a weighing conveyor (weighing conveying means) 1 and a weight sensor 2. The weight sensor 2 is a load cell or the like that supports the weighing conveyor 1 and measures the weight of the object P to be measured on the weighing conveyor 1.

  The weighing conveyor 1 is constituted by a belt conveyor having an endless belt, and the conveyance direction can be switched between a direction indicated by an arrow a (right direction) and a direction indicated by an arrow b (left direction). That is, the weighing conveyor 1 can carry in either direction of arrows a and b. In the weighing conveyor 1, a plurality of holding positions are determined at predetermined intervals in the machine length direction (conveying direction) as positions for holding the workpiece P when the conveyance is stopped. Here, the two holding positions 1A and 1B (the first holding position 1A and the second holding position 1B) are determined at a predetermined interval L (hereinafter also referred to as “predetermined distance L”) in the machine length direction (conveyance direction). ing. Each holding position 1A, 1B holds one object P (that is, the object P for one supply) supplied at different timings.

  The discharge device 3 is provided to convey (discharge) an object to be weighed P selected from the discharge combination described later and discharged from the weighing conveyor 1 to the outside. The discharge device 3 here is configured by arranging two discharge conveyors 3a and 3b, each of which is a belt conveyor having an endless flat belt, in parallel so that the transport surfaces thereof have a V-shaped cross section. The two discharge conveyors 3a and 3b have the same conveying speed, and here, the direction of the arrow c is the conveying direction. These two discharge conveyors 3a and 3b are arranged with a gap (predetermined interval) therebetween. The gap between the two discharge conveyors 3a and 3b is, for example, about several millimeters, and has a small size so that the object to be weighed does not fall from the gap and the object to be weighed is not caught in the gap. The object P to be weighed conveyed in the direction of the arrow c by the discharge device 3 is supplied to a subsequent device (not shown).

  Here, the weighing conveyors 1 of the plurality of weighing units Cw are arranged in parallel, the conveying direction of each weighing conveyor 1 (direction of arrows a and b), and the conveying direction of the discharge conveyors 3a and 3b (direction of arrow c), Are arranged so as to be orthogonal to each other.

  And in the apparatus main body part 11 which consists of a housing | casing, discharge | emission conveyors 3a, 3b etc. except the some measurement part Cw and both ends are accommodated. Further, the top 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 the upper portion of the first holding position 1 </ b> A of the weighing conveyor 1. The workpiece P is supplied from the opening 11a to the first holding position 1A (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 weight calculation means, combination means, conveyance control means, abnormality determination 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 is controlled via the conveyor driving circuit unit 8a, and the conveying operation of the discharge conveyors 3a and 3b 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. The operation indicator 4 has a built-in speaker, and an alarm sound can be output from the built-in speaker under the control of the control unit 5.

  An example of the operation of the combination weigher of the 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 according to one 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 first holding position 1A of the weighing conveyor 1, the operator puts the weighing object P into the first holding position 1A through the opening 11a, for example. Supply (load) one by one as needed.

  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, the increase amount of the measured value is compared with a preset load detection reference value. When the increase amount of the measured value is equal to or greater than the load detection reference value, it is determined that a new object to be weighed is supplied, and when it is less than the load detection reference value, it is determined that a new object to be weighed is not supplied. The loading detection reference value is set in advance in the control unit 5 and stored in the storage unit 7.

  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 value at the holding position 1A (1B) is the weight value of the object to be weighed placed at the holding position 1A (1B).

  For example, when it is determined in step S1 that the object to be weighed is newly supplied as described above, the amount of increase in the measured value is set to the weight of the object to be newly supplied, and the weight value is set to the first holding position. The weight value of 1A is stored in the storage unit 7 (step S2). For example, a weight value table for storing the weights of the objects to be weighed at the first holding position 1A and the second holding position 1B of each weighing conveyor 1 is created in the storage unit 7. 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. Here, since the objects to be weighed are supplied to the first holding position 1A in each weighing conveyor 1, first, the weight Wn of the newly supplied objects to be weighed is the first holding position 1A of the corresponding weighing conveyor 1. Is stored as a weight value.

  Then, it is determined whether or not an object to be weighed is placed on the second holding position 1B of the weighing conveyor 1 (step S3). This determination is made, for example, based on whether or not the weight value of the second holding position 1B of the weighing conveyor 1 in the weight value table is zero.

  When the object to be weighed is not placed on the second holding position 1B (when it is not held), that is, when the weight value at the second holding position 1B in the weight value table is 0, the weighing conveyor 1 is moved to the arrow. A transport operation is performed in the direction b by a predetermined distance L (a distance between the first holding position 1A and the second holding position 1B), and the object to be weighed at the first holding position 1A is transferred to the second holding position 1B (step S4). . Then, the weight value of the second holding position 1B in the weight value table is changed to the weight Wn, and the weight value of the first holding position 1A is reset to 0 (step S5).

  In step S3, when an object is placed on the second holding position 1B, that is, when the weight value at the second holding position 1B in the weight value table is not 0, the weighing conveyor 1 is stopped. Remains.

  The above processing is performed every time an object to be weighed is newly supplied to an arbitrary weighing conveyor 1. Accordingly, the weights of the objects to be weighed P that are placed on the holding positions 1A and 1B and whose weighing values are determined are all stored in the weight value table.

  Here, the combination process by the control unit 5 will be described. In this combination processing, a combination calculation is performed based on the weight of the object P stored in the weight value table of the storage unit 7, and the total weight (combination weight) of the object to be weighed is a target weight range (combined target weight). Obtain one combination of objects to be weighed that falls within the (acceptable range) and determine the discharge combination. When there are a plurality of combinations in which the combination weight falls within the target weight range, 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 transported by the weighing conveyor 1 holding the objects to be weighed and discharged onto the discharging device 3.

  Here, the control unit 5 performs a transport operation in the direction of the arrow a with the predetermined distance L as the transport distance, for example, for the weighing conveyor 1 in which the object to be weighed only in the first holding position 1A is selected as the discharge combination. After discharging the object to be weighed at the 1 holding position 1A, in order to make the supply position empty, the conveyance operation is performed in the direction of arrow b with the predetermined distance L as the conveyance distance, and stopped. Then, the weight value at the first holding position 1A of the weighing conveyor 1 stored in the weight value table is discarded and reset to zero. In this case, the distance conveyed in the arrow a direction of the weighing conveyor 1 may be shorter than L as long as the object to be weighed at the first holding position 1A can be discharged, and then conveyed in the arrow b direction. The distance may be the same distance as the distance previously conveyed in the direction of arrow a.

  Further, the control unit 5 causes the weighing conveyor 1 in which the object to be weighed only in the second holding position 1B is selected as the discharge combination to be transported in the direction of the arrow b with the predetermined distance L as the transport distance, and is held second. The object to be weighed at position 1B is discharged and stopped. As a result, the object to be weighed at the first holding position 1A is conveyed to the second holding position 1B. Then, the weight value at the second holding position 1B of the weighing conveyor 1 stored in the weight value table is discarded, and the weight value at the first holding position 1A immediately before (before the transfer operation) is newly held at the second value. The weight value of the position 1B is stored, and the weight value of the first holding position 1A is reset to zero.

  For the weighing conveyor 1 in which the objects to be weighed in both the holding positions 1A and 1B are selected as the discharge combination, the control unit 5 preliminarily uses, for example, twice the predetermined distance L (2L) as the conveyance distance. The conveying operation is performed in a predetermined direction (for example, the direction of arrow a), and the objects to be weighed at both holding positions 1A and 1B are discharged and stopped. Then, the weight values at the second holding position 1B and the first holding position 1A of the weighing conveyor 1 stored in the weight value table are discarded and reset to zero. In this case, the conveyance distance of the weighing conveyor 1 may be shorter than 2L as long as the objects to be weighed at both holding positions 1A and 1B can be discharged.

  As described above, the control unit 5 controls the transport operation of the weighing conveyor 1 so as to discharge only the objects to be weighed selected for the discharge combination, and the weighing conveyor 1 for which the objects to be weighed are selected for the discharge combination. When is driven, the weight value in the weight value table is updated.

  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 weighing conveyor 1 holding the objects to be weighed selected for the discharge combination is driven as described above, and the objects to be weighed on the weighing conveyor 1 are moved to the discharge conveyors 3a and 3b. While being conveyed, the discharge conveyors 3a and 3b are driven for a predetermined time to convey the objects to be weighed conveyed from the weighing conveyor 1 to the subsequent apparatus. Then, the weight value in the weight table relating to the driven weighing conveyor 1 is updated as described above (step S14), 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 when a discharge completion signal from the combination weigher is input. 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 3 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 an empty tray is moved to the discharge port of the discharge device 3 (the transfer terminal portion of the discharge conveyors 3a and 3b). Then, after a discharge completion signal is input from the combination weigher, the tray is moved after a predetermined time has elapsed, and the next empty tray is moved to the discharge port of the discharge device 3.

  Further, the control unit 5 drives the weighing conveyor 1 in which the objects to be weighed are selected as the discharge combination to discharge the objects to be weighed and stop the weighing objects after being stopped. Based on this, it is configured to determine whether or not there is an abnormality. For example, when one of the two objects to be weighed on the weighing conveyor 1 is selected as the discharge combination, the weight value of the weight sensor 2 after discharge and the weight of the remaining objects to be weighed It is determined whether or not the values are equal. If they are not equal, a signal indicating that the weighing unit Cw is abnormal is output to the operation indicator 4 and the combination weigher is stopped.

  When all the objects to be weighed on the weighing conveyor 1 are discharged, it is determined whether or not the weight value of the weight sensor 2 after discharge is equal to zero. A signal indicating an abnormality is output to the operation display 4 and the operation of the combination weigher is stopped.

  Here, when the weighing unit Cw is abnormal, there may be a case where an object to be weighed remains on the weighing conveyor 1. Moreover, the case where the zero point of the weight sensor 2 is abnormal is also considered.

  And if the operation indicator 4 inputs the signal which shows that the measurement part Cw is abnormal from the control part 5, it will alert | report to an operator that the measurement part Cw is abnormal. As this notification means (abnormality notification means), for example, an alarm sound is output from a built-in speaker of the operation indicator 4 and a layout diagram of the weighing conveyor 1 is displayed on the display screen, and the weighing conveyor of the weighing unit Cw that is abnormal is displayed. 1 may be configured to be displayed in a different color or blinking from other weighing conveyors 1. Other configurations may be used as long as the operator can be notified of which measuring unit Cw is abnormal. For example, one indicator lamp corresponding to each weighing conveyor 1 is provided, and the indicator lamp corresponding to the weighing conveyor 1 of the abnormal weighing unit Cw is turned on or blinked under the control of the control unit 5. Also good.

  By notifying that the weighing unit Cw is abnormal as described above, when the object to be weighed is discharged from the weighing conveyor 1 to the discharge device 3, the object to be weighed should be discharged for some reason. 1 can be notified to the operator that the weight sensor 2 is left on or the zero point of the weight sensor 2 is abnormal, and it is possible to prevent a measurement error product from being supplied to the subsequent device. become.

  In the present embodiment, a plurality of holding positions 1A and 1B are provided for each weighing conveyor 1 and the objects to be weighed on each weighing conveyor 1 can be discharged to both the left and right sides. A plurality of weight values used for the calculation can be obtained, and the weight values of the objects to be weighed at the respective holding positions 1A and 1B can be used alone for the combination calculation. That is, in the combination process, for each weighing unit Cw, a combination including only the weight value of the weighing object at the first holding position 1A, and a combination including only the weight value of the weighing object at the second holding position 1B, Since the discharge combination including the combination including the weight values of the objects to be weighed at both holding positions 1A and 1B can be obtained, the number of combinations increases, and the combination accuracy can be improved.

  Therefore, it is possible to reduce the number of weighing parts Cw to suppress an increase in manufacturing cost, to make the combination weigher compact, and to reduce the installation area. 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 unit Cw.

  Also, in the case of a combination weigher that manually feeds the object to be weighed, the operator must pay attention so that the object to be weighed does not get caught in the hopper's discharge gate at the wrong timing. However, since the work for supplying the objects to be weighed in this embodiment is simply placed on the weighing conveyor 1, even an unskilled worker can easily perform the work.

  Further, in the present embodiment, the number of the weighing units Cw can be reduced as described above, and the holding position where the operator supplies the objects to be weighed to each weighing conveyor 1 is determined at one place. The burden on the worker who performs the supply work can be further reduced.

  In this embodiment, the operator may be notified of the holding position 1A to which the object to be weighed is to be supplied. This notification means (supply timing notification means) may be any as long as it can notify the worker. For example, an indicator lamp 12 (see FIGS. 1A and 1B) corresponding to the first holding position 1A of each weighing conveyor 1 is provided, and a first object to be weighed is supplied under the control of the control unit 5. You may comprise so that the indicator lamp 12 corresponding to 1 A of holding positions may be lighted. In the control unit 5, when the weighing conveyor 1 is in the transport stop state and there is no object to be weighed at the first holding position 1A of the weighing conveyor 1, the indicator lamp 12 corresponding to the first holding position 1A is turned on. Let Thus, the operator only needs to supply the object to be weighed in response to the lighting of the indicator lamp 12, so that the operator confirms the conveyance stop state of the weighing conveyor 1 and the object to be weighed is not placed through the opening 11a. It is possible to easily supply an object to be weighed without searching for one holding position 1A.

  In the present embodiment, the configuration in which the right holding position 1A is the supply position for supplying the object to be weighed has been described, but the operation display 4 can be used to set and change the holding position as the supply position. You may comprise. In this case, an opening similar to the opening 11a may be provided on both holding positions 1A and 1B of the weighing conveyor 1 of the apparatus main body 11 so that an object to be weighed can be supplied. You may open all the upper parts and provide the mark which shows each holding position in the flame | frame of the weighing conveyor 1, etc. Or you may comprise so that the position can be changed by sliding the opening part 11a. With this configuration, the supply position can be set and changed. For example, when the standing position of the worker performing the supply operation is changed from the right side to the left side of the combination weigher, the supply position is changed from the right holding position 1A to the left side. By changing to the holding position 1B, it becomes easier to perform the supply operation. Further, the operation indicator 4 may be used to set the number of holding positions on each weighing conveyor 1 and the interval between adjacent holding positions. As described above, the supply position set using the operation indicator 4, the number of holding positions, the interval between adjacent holding positions, and the like are stored in the control unit 5.

  In the present embodiment, the weighing object 1 is supplied to the weighing conveyor 1 by the operator only to one holding position 1A. However, the operation is performed to all the holding positions 1A and 1B of each weighing conveyor 1. A person may supply the object to be weighed. In this case, for example, an opening similar to the opening 11a may be provided on both holding positions 1A and 1B of the weighing conveyor 1 of the apparatus main body 11 so that an object to be weighed can be supplied. The upper part of 11 may be opened, and a mark indicating each holding position may be provided on the frame of the weighing conveyor 1 or the like. And when there are no objects to be weighed on both holding positions 1A and 1B of the weighing conveyor 1, the order of supplying the objects to be weighed out of the two holding positions 1A and 1B is determined in advance, and the control unit 5 Assuming that the objects to be weighed sequentially supplied to the weighing conveyor 1 are supplied to the holding positions in order, the weight value of the objects to be weighed is stored as the weight value of the holding position. For example, when the supply order is determined as the first holding position 1A for the first and the second holding position 1B for the second, the weight value of the object to be weighed first is set to the first holding position 1A. The weight value is stored, and the weight value of the object to be weighed next is stored as the weight value of the second holding position 1B. Further, in this case, for example, an indicator lamp similar to the indicator lamp 12 described above is provided for each holding position 1A, 1B of the weighing conveyor 1, and the holding positions 1A, 1B to which the objects to be weighed are to be supplied are provided. You may make it alert | report to. Thereby, the worker can easily perform the work of supplying the object to be weighed, similarly to the case where the indicator lamp 12 is provided.

  As described above, when the operator supplies the objects to be weighed to both holding positions 1A and 1B, compared to the case where the object to be weighed is supplied only to one first holding position 1A, Control of the conveyance operation of each weighing conveyor 1 can be simplified. For example, in each weighing conveyor 1, when there are no objects to be weighed in both holding positions 1A and 1B, the objects to be weighed are supplied to both holding positions 1A and 1B while the weighing conveyor 1 is stopped. Good. Further, in each weighing conveyor 1, from the state where the objects to be weighed are held at both holding positions 1A and 1B, the weighing conveyor 1 is transported in the direction of arrow a to discharge the objects to be weighed only at the first holding position 1A. In this state, it is not necessary to move the weighing conveyor 1 in the direction of the arrow b in order to enable the supply of the next object to be weighed (that is, to empty the first holding position 1A). The above is the same when the supply device 50 shown in FIG. 7 is used.

  Conventionally, there is a combination weigher using a weighing hopper that is supported by a weight sensor and temporarily holds and discharges an object to be supplied. In such a weighing hopper, the discharge gate is opened and the object to be weighed is opened. In order to accept the next object to be weighed, it was necessary to close the open discharge gate. On the other hand, as described above, when the object to be weighed is supplied to both the holding positions 1A and 1B, after the weighing conveyor 1 performs the discharge operation (conveying operation) of the object to be weighed. The object to be weighed can be immediately supplied to the weighing conveyor 1. In other words, by using the weighing conveyor 1, the weighing conveyor 1 can take a ready state for receiving the next object by performing the discharge operation of the object to be measured. Can be achieved.

  Further, in the weighing hopper used in the conventional combination weigher, in order to measure the weight of two objects to be weighed, the inside of the hopper is divided into two holding chambers each temporarily holding the objects to be weighed, There is a weighing hopper provided with a discharge gate for discharging an object to be weighed in each holding chamber. In such a weighing hopper, a driving mechanism for two discharge gates is required, which not only makes the structure complicated but also makes the control complicated. On the other hand, when the weighing conveyor 1 is used as in this embodiment, each of the two objects to be weighed P on the weighing conveyor 1 can be discharged alone by changing the transport direction of the weighing conveyor 1. Simple structure and control.

  Further, as described above, when the operator supplies the objects to be weighed to both the holding positions 1A and 1B, the objects to be weighed with respect to the holding positions 1A and 1B of the weighing conveyors 1 respectively. For example, a photoelectric sensor or the like is provided for detecting that the sensor is supplied (mounted), and a detection signal from the object detection means is output to the control unit 5. Also good. And in the control part 5, when there is no to-be-measured object on both holding position 1A, 1B of the weighing conveyor 1, supply of to-be-measured object is carried out with respect to the holding position of the predetermined order based on the said detection signal. It may be determined whether or not it is performed in the order, and if not performed in order, an alarm may be output to stop the operation of the combination weigher. Here, as the alarm output means, for example, an alarm sound is output from the built-in speaker of the operation display 4 and the weighing conveyor 1 on which the objects to be weighed are not supplied in order is displayed on the display screen. Alternatively, the two indicator lamps provided corresponding to both holding positions 1A and 1B of each weighing conveyor 1 may be lit in a specific color. Thereby, it is possible to prevent a poorly measured product from being supplied to the subsequent apparatus.

  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 combination processing is performed at a predetermined time interval set in advance and a discharge command signal is input, the weighing conveyor 1 and the discharge device 3 in which the objects to be weighed in the holding position are selected as the discharge combination are driven to be weighed. You may make it discharge | emit a thing to a back | latter stage apparatus. In addition, when a discharge command signal is not input from the subsequent apparatus, or when there is no subsequent apparatus and another worker receives an object to be discharged from the discharge apparatus 3, a predetermined time interval is set. Combination processing may be performed.

  In the present embodiment, for example, one certain weighing unit Cw may be used as a large charging weighing unit (BCw). In other words, the weighing unit BCw for large input is configured to be able to measure and transport an object to be weighed that is heavier than the other weighing units Cw. Specifically, for example, the weight sensor 2 of the weighing unit BCw for large input uses a load cell having a larger rated capacity than the weight sensor 2 of the other weighing unit Cw, and the weighing of the weighing unit BCw for large input For example, a belt conveyor having a larger belt width than the weighing conveyor 1 of the other weighing unit Cw is used as the conveyor 1. In this case, for example, an object to be weighed of 60 to 90% of the combined target weight is supplied to the weighing conveyor 1 of the weighing unit BCw for large input, and 1 / n (n is 2 or more) of the remaining weight. To be weighed to the weighing conveyor 1 of the other weighing unit Cw. In this case, in the combination process, the control unit 5 obtains a discharge combination so as to always include one object to be weighed on the weighing conveyor 1 of the weighing unit BCw for large input. Such a configuration is suitable when the combination target weight is large, in other words, when the total weight of the objects to be weighed selected for the discharge combination is large.

  In the present embodiment, since the two discharge conveyors 3a and 3b arranged in a V-shaped cross section are used as the discharge device 3, the object to be weighed has a V-shaped cross section of the two discharge conveyors 3a and 3b. It is transported while being positioned at the bottom, and prevents the object to be scattered from being scattered in the width direction of the discharge device 3 (the direction orthogonal to the transport direction) and accurately supplies the object to be measured to the subsequent apparatus. be able to. Further, when the object to be weighed has a rod shape or an elongated shape, the object to be weighed is transported in a state where it lies on the bottom part of the V-shaped cross section of the two discharge conveyors 3a and 3b. It is possible to discharge with the direction aligned in the same direction as the conveying direction of the discharge device 3.

  In this embodiment, the discharge device 3 in which the two discharge conveyors 3a and 3b are arranged so as to have a V-shaped cross section is used. However, as the discharge device, both edges of the transport surface for transporting the object to be weighed If a transport device having a height higher than that of the central portion is used, the same effect as the above-described discharge device 3 can be obtained.

  Still another example of the discharge device is shown in FIGS. FIG. 4 and FIG. 5 are views showing another example of the discharging device of the combination weigher of the present embodiment, respectively, and are schematic schematic views of the combination weigher using another discharging device as seen from the side.

  The discharge device shown in FIG. 4 is disposed immediately below a plurality of weighing conveyors 1 arranged in a row, and includes a discharge conveyor 22 including a belt conveyor that conveys objects to be weighed in the row direction of the weighing conveyor 1, and a weighing conveyor. 1 are provided with plate-like chutes 21a and 21b for guiding an object to be weighed discharged from both end sides of 1 to the discharge conveyor 22. The objects to be weighed discharged from the weighing conveyor 1 slide down on the chutes 21 a and 21 b and are discharged onto the discharge conveyor 22. And it is conveyed by the discharge conveyor 22 to a back | latter stage apparatus, for example.

  Further, the discharge device shown in FIG. 5 includes two discharge conveyors 25a and 25b including two belt conveyors disposed obliquely below the left and right sides of the plurality of weighing conveyors 1 arranged in a row, two discharge conveyors 25a, Disposed below 25 b and directly below the plurality of weighing conveyors 1, is provided with a discharge conveyor 26 comprising a belt conveyor that conveys the objects to be weighed in the direction in which the weighing conveyors 1 are arranged. The objects to be weighed discharged from the weighing conveyor 1 to the discharge conveyor 25a are conveyed by the discharge conveyor 25a in the direction of the arrow b and discharged onto the discharge conveyor 26. In addition, the objects to be weighed discharged from the weighing conveyor 1 to the discharge conveyor 25b are transported in the direction of arrow a by the discharge conveyor 25b and discharged onto the discharge conveyor 26. Then, the sheet is conveyed to, for example, a subsequent apparatus by the discharge conveyor 26. Here, the discharge conveyors 25 a and 25 b are provided corresponding to all the weighing conveyors 1, but a plurality of discharge conveyors 25 a and 25 b may be provided corresponding to the respective weighing conveyors 1. In this case, the level difference between the weighing conveyor 1 and the discharge conveyors 25a and 25b and the level difference between the discharge conveyors 25a and 25b and the discharge conveyor 26 can be reduced. Damage can be prevented.

  FIG. 6A is a schematic schematic view of the main part of the combination weigher using another discharging device as seen from the side, and FIG. 6B is a schematic plan view of the main part of the combination weigher viewed from above. FIG.

  6 (a) and 6 (b) is a belt that is arranged on both sides of a plurality of weighing conveyors 1 arranged in a row, and conveys objects to be weighed discharged from the weighing conveyor 1 in the direction of arrow c. Discharge conveyors 31a and 31b composed of conveyors, and a discharge conveyor 32 composed of a belt conveyor that conveys the objects to be weighed conveyed from the discharge conveyors 31a and 31b in the direction of arrow d. The objects to be weighed discharged from the discharge conveyor 32 are supplied to a subsequent apparatus such as a packaging machine. In this case, the level difference between the weighing conveyor 1 and the discharge conveyors 31a and 31b and the level difference between the discharge conveyors 31a and 31b and the discharge conveyor 32 can be reduced. Damage can be prevented.

  Further, as shown in FIGS. 6A and 6B, a discharge conveyor 31a that conveys the objects to be weighed discharged from the weighing conveyors 1 to the right side and the objects to be weighed discharged from the weighing conveyors 1 to the left side. In the configuration in which the discharge conveyor 31b that conveys the liquid is disposed, the number of the weighing units Cw may be increased, and two discharge combinations (first and second discharge combinations) may be simultaneously obtained in the combination processing. . In this case, for example, only the objects to be weighed selected as the first discharge combination are discharged to one discharge conveyor 31a, and only the objects to be weighed selected as the second discharge combination are discharged to the other discharge conveyor 31b. What is necessary is just to obtain | require the 1st and 2nd discharge | emission combination so that it can discharge | emit in this way. That is, the first discharge combination to be discharged to the right discharge conveyor 31a is obtained by excluding the combination in which the objects to be weighed only at the second holding position 1B are selected in each weighing conveyor 1, and the left discharge conveyor 31b. What is necessary is just to obtain | require the 2nd discharge | emission combination discharged | emitted except for the combination in which each to-be-measured object only in 1st holding position 1A is selected in each measurement conveyor 1. Here, the objects to be weighed on the same weighing conveyor 1 may not be selected for the first discharge combination and the second discharge combination.

  In FIGS. 6A and 6B, the weighing conveyor 1 (the weighing unit Cw) is arranged in one row, but the weighing conveyor 1 (the weighing unit Cw) is, for example, two rows (the right column is the first row). A first discharge conveyor that conveys an object to be measured discharged from the weighing conveyor 1 in the first row to the right, and a weighing conveyor 1 in the first row. The second discharge conveyor for conveying the objects to be weighed discharged to the left side and the objects to be weighed discharged from the second row of the weighing conveyor 1 to the right side, and the objects to be weighed discharged from the second row of the weighing conveyor 1 to the left side. It is good also as a structure provided with the 3rd discharge conveyor which conveys a thing. The first, second and third discharge conveyors have the same configuration as the discharge conveyors 31a and 31b. In this case as well, two discharge combinations (first and second discharge combinations) may be obtained simultaneously in the combination process. In this case, for example, the object to be weighed selected as the first discharge combination is discharged to the first and third discharge conveyors, and the object to be weighed selected as the second discharge combination is the second in the middle. What is necessary is just to obtain | require the 1st and 2nd discharge combination so that it may discharge | emit to a discharge conveyor. Then, for example, the transport direction of the first and third discharge conveyors is reversed to the transport direction of the second discharge conveyor, and the objects to be weighed discharged from the first discharge conveyor and the third discharge conveyor are collected. In order to do this, for example, a fourth discharge conveyor may be provided whose transport direction is orthogonal to the first and third discharge conveyors. It is also possible to arrange the weighing conveyors 1 in two rows and obtain three discharge combinations at the same time in the combination process.

  In the present embodiment, the operator supplies the objects to be weighed to the weighing conveyor 1, but the objects to be weighed may be supplied to the weighing conveyor 1 by a supply device. In this case, it is preferable to configure so that the objects to be weighed are supplied to all the holding positions 1A and 1B of each weighing conveyor 1 by the supply device. FIG. 7 is a schematic diagram illustrating an example of a supply device. In the case of FIG. 7, one supply device 50 is provided above each weighing conveyor 1 so as to correspond to each weighing conveyor 1. The supply device 50 is configured by a hopper that can temporarily hold an object to be weighed supplied from above and can discharge it in two directions. That is, the supply 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 the workpiece P at the first holding position 1A of the weighing conveyor 1 is discharged, the weighing conveyor 1 is transported to the right by a predetermined distance L (see FIG. 1B). Stop. Then, the object P to be weighed at the second holding position 1B is transferred to the first holding position 1A, and there is no object to be weighed at the second holding position 1B. Therefore, the control unit 5 opens the second discharge gate 52b of the supply device 50. By opening and closing, the object to be weighed in the supply device 50 is supplied to the second holding position 1B. 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 1A and 1B where the weighing object P is not present when the weighing conveyor 1 is in the transport stop state.

  Further, when there is no object to be weighed in both the holding positions 1A and 1B, the control unit 5 causes the supply device 50 to supply the object to be weighed in a predetermined supply order. For example, if the first supply position is set as the first holding position 1A and the second is set as the second holding position 1B, the object P previously held in the supply device 50 is first discharged to the first discharge gate 52a. Is opened and closed and supplied to the first holding position 1A, and then the object P to be supplied to the supply device 50 is supplied to the second holding position 1B with the second discharge gate 52b opened and closed. In this case, for example, the controller 5 opens and closes the first discharge gate 52a and then opens and closes the second discharge gate 52b after a predetermined time has elapsed.

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

  As described above, when the objects to be weighed are supplied to both the holding positions 1A and 1B using the supply device 50, the operator supplies the objects to be weighed to both the holding positions 1A and 1B. It is only necessary to control the transport operation of each weighing conveyor 1 in the same manner as in the case of the configuration, and the transport operation of each weighing conveyor 1 can be easily controlled as compared with the case where an object to be weighed is supplied to only one holding position 1A. it can.

  The supply device 50 is a conveyor used for other than the combination weigher, and supplies the objects to be weighed to a conveyor that needs to supply objects to be measured to two different positions on the conveyor at different timings. It can be used as a device.

  In this embodiment, each weighing conveyor 1 has two holding positions for the objects to be weighed. For example, the length of the weighing conveyor 1 is increased to set three or more holding positions. Also good. For example, the case where three holding positions are set on the weighing conveyor 1 will be briefly described. Here, when the machine length direction of the weighing conveyor 1 is the left-right direction, it is assumed that the first, second, and third holding positions are determined at regular intervals, for example, sequentially from the right side.

  In this case, the object to be weighed may be supplied to only one predetermined holding position, for example, the first holding position. Alternatively, for example, it may be configured to be performed at two adjacent holding positions, for example, the first and second holding positions, or may be configured to be performed at all the first, second, and third holding positions. Good. When configured to supply an object to be measured to two adjacent holding positions, the above-described supply device 50 can also be used.

  In the combination processing in this case, it is only necessary to obtain the discharge combination except for the combination in which only the objects to be weighed at the center second holding position are selected in each weighing conveyor 1, and the number of weighing units Cw is the same. If so, the number of combinations increases as compared with the case where the two holding positions 1A and 1B are set, so that the combination accuracy can be further improved. Moreover, when the combination accuracy equivalent to the case where the two holding positions 1A and 1B are set is sufficient, the number of the weighing units Cw can be reduced.

  When setting a plurality of holding positions, including the case where three or more holding positions are set on the weighing conveyor 1, when one of the holding positions is set as the supply position, the holding positions at both ends are set. It is preferable to set one of the holding positions as the supply position, whereby the increase in the length of the weighing conveyor 1 can be suppressed. In addition, when m holding positions (m is an integer of 3 or more) are set on the weighing conveyor 1, and k holding positions (k is an integer of 2 or more smaller than m) are set as supply positions, It is preferable that k holding positions that include any one of the holding positions at both ends and that are adjacent to each other are set as the supply positions, thereby suppressing an increase in the length of the weighing conveyor 1.

  When three or more holding positions are set on the weighing conveyor 1, in the combination process, an object to be weighed other than the objects to be weighed at both ends held by the weighing conveyor 1 (this is referred to as “inner object to be weighed”). ”) Is selected as the discharge combination, all the objects from the inner weighed object to at least one of the weighed objects at both ends are selected as the discharge combination. What is necessary is just to obtain | require an emission combination.

  In this embodiment, each weighing unit Cw is provided with a standby conveyor made up of a belt conveyor, for example, obliquely below the weighing conveyor 1 corresponding to the weighing conveyor 1, and the weight to be weighed on the weighing conveyor 1 is calculated. It may be configured such that an object is supplied from the weighing conveyor 1 to the standby conveyor in the conveyance stopped state and temporarily held by the standby conveyor. In the combination process, the number of combinations increases by selecting the discharge combination from among the objects to be weighed on all weighing conveyors 1 and the objects to be weighed on all standby conveyors. Thus, the combination accuracy can be further improved. Each standby conveyor may hold only one object to be weighed or a plurality of objects to be weighed. Further, each weighing unit Cw may be configured to provide a plurality of standby conveyors. Further, in each weighing section Cw, a plurality of objects to be weighed are held on the standby conveyor in the same manner as the weighing conveyor 1 so that the objects to be weighed on the weighing conveyor 1 are not selected in the combination process. The discharge combination can be selected from the objects to be weighed on all the standby conveyors. In either case, the supply of the objects to be weighed to the weighing conveyor 1 may be performed manually or may be performed by a supply device such as the supply device 50 shown in FIG.

  In this embodiment, a belt conveyor is used for the weighing conveyor 1 and the standby conveyor described above, but a roller conveyor or the like may be used depending on the type of the object to be weighed.

  INDUSTRIAL APPLICABILITY The present invention is useful as a combination weigher or the like that can improve the combination accuracy and suppress an increase in manufacturing cost and can be made compact.

Cw Weighing unit 1A, 1B Holding position 1 Weighing conveyor 2 Weight sensor 3 Discharge device 4 Operation indicator 5 Control unit 50 Supply device 51 Hopper body 52a, 52b Discharge gate

Claims (14)

Each of the supplied objects to be weighed is temporarily held at each of a plurality of holding positions determined in the conveying direction, and the held objects to be weighed are conveyed in two directions, the first direction and the second direction which are opposite to each other. A plurality of weighing transport means possible;
A plurality of weight sensors, each of which is provided corresponding to the weighing transport means and measures the weight of an object to be weighed on the weighing transport means;
Weight calculating means for calculating the weight of an object to be weighed held at each holding position based on the measured value of the weight sensor;
Storage means for storing the weight value of the object to be measured calculated by the weight calculation means;
Based on the weight value of the object to be weighed calculated by the weight calculating means and stored in the storage means, a combination for obtaining a discharge combination consisting of a combination of objects to be weighed within the target weight range. Means,
Transport control means for transporting the weighing transport means so as to discharge only the objects to be weighed selected for the discharge combination ;
With
The storage means stores the weight value of the weighing object held in the weighing conveyance means after the conveyance in the first direction or the second direction by the weighing conveyance means in a new holding position. Combination weigher that memorizes as weight value .   The conveyance control means controls the weighing conveyance means to convey in the first direction and controls the weighing conveyance means to convey in the second direction according to the holding position of the object to be weighed. By discharging only the objects to be weighed selected for the discharge combination,
  The combination weigher according to claim 1.   Comprising setting means for setting the number of holding positions on each weighing transport means;
  The combination weigher according to claim 1 or 2.   The plurality of holding positions determined in each of the weighing transport means is composed of first and second holding positions,
  The transport control means includes
  For the weighing transport means in which the object to be weighed only in the first holding position is selected as the discharge combination, only the object to be weighed is discharged by being conveyed in the first direction, and the second With respect to the weighing transport means in which the weighing object only in the holding position is selected as the discharge combination, only the weighing object is discharged by being conveyed in the second direction, and the first and second objects are discharged. With respect to the weighing transport means in which both the objects to be weighed in the holding position are selected as the discharge combination, both of the two objects are transported in the predetermined direction of the first and second directions. Configured to discharge the object to be weighed,
  The combination balance according to any one of claims 1 to 3. In each of the weighing transport means, one holding position 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,
The conveyance control means supplies the objects to be weighed supplied to the supply position when the objects to be weighed are not held at the holding positions other than the supply position. Configured to transport to the holding position other than the position,
The combination balance according to any one of claims 1 to 4 . An opening for supplying an object to be weighed above the supply position, and a cover for covering the upper side of the weighing conveying means ;
The position of the opening is configured to be changeable by sliding,
The combination weigher according to claim 5 . The combination weigher according to claim 5 or 6 , further comprising a supply timing notifying means for notifying an operator of a timing at which an object to be weighed should be supplied to the supply position in each of the weighing conveying means. The combination weigher according to claim 5 , further comprising supply position changing means for changing the supply position. In each of the weighing conveying means, all the holding positions are predetermined as supply positions for supplying the objects to be weighed, and the objects to be weighed are manually or automatically supplied to the supply positions. The combination weigher according to claim 1. In each weighing section comprising the weighing conveying means and the weight sensor provided corresponding to each other, the weighing conveying means immediately after the object to be weighed is discharged from the weighing conveying means and the driving is stopped. The combination weigher according to any one of claims 1 to 9 , further comprising an abnormality determination unit that determines whether or not the weighing unit is abnormal based on a measurement value of the weight sensor corresponding to. The combination weigher according to claim 10 , further comprising abnormality notifying means for notifying an operator of the weighing unit that is abnormal based on a determination result by the abnormality determining means. And conveys and the objects to be weighed discharged from the weighing conveyor means, edges of the conveying surface is further provided with a discharge device is higher than the central portion, to one of the claims 1 to 11 The combination weigher described. Of the plurality of weighing units each including the weighing conveying means and the weight sensor provided in correspondence with each other, one weighing unit measures an object to be weighed that is heavier than the other weighing units. Configured to carry,
The combination means includes
Configured to obtain the discharge combination so that an object to be weighed held on the weighing conveying means of the one weighing unit is always selected;
The combination weigher according to claim 1. In each of the weighing transport means, two adjacent holding positions are predetermined in a supply position for supplying an object to be weighed, and are used for supplying an object to be measured to each of the two supply positions. ,
A first discharge gate disposed above each of the weighing conveying means, temporarily holding the supplied objects to be weighed, and supplying the objects to be measured to one of the two supply positions; The combination weigher according to claim 1, further comprising a plurality of supply devices configured to have a second discharge gate for supplying an object to be weighed to the other.

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