JP2017090295A - Combined quantity measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of conducting combined quantity measurement to solve problems peculiar to repeating of discharging multiple times to measure eventually a prescribed quantity without sacrificing the utilization rate of the device even if so stringent a level of measuring accuracy is required that discharging of goods is not authorized unless the target value combination is perfectly satisfied.SOLUTION: A combined quantity measuring device is equipped with a setting unit that, when a target value combination surpasses the upper limit of quantity measurement, causes a hopper having ended quantity measurement to discharge goods, cumulatively totals the quantities discharged and conducts combined quantity measurement as a deviation of the cumulative total from the target value combination when the deviation has become less than the measurable upper limit, sets a first target value that determines the deviation and a second target value smaller than the first. After the cumulative total has reached the second target value, goods are discharged from individual hoppers having completed quantity measurement to bring the cumulative total to the first target value thereby to accomplish combined quantity measurement.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a combination weighing device that measures a certain number of industrial standard products in which variation in unit mass is hardly observed.

  A combination weighing device is widely used to weigh articles with a variation in unit mass to a constant mass, but it is also applicable to industrial standard products such as bolts and nuts that have little variation in unit mass. It is used as a counting device that measures a certain number. When the latter counting device is used, articles are supplied to each weighing hopper, and the measured value of each weighing hopper is divided by the single mass to convert it into a number. (See Patent Document 1).

  When the combination target value exceeds a predetermined value that can be measured by one combination weighing, the discharge of articles from all weighing hoppers is repeated a plurality of times, and the deviation between the total discharge amount and the combination target value is finally determined. They are combined as target values (see Patent Document 2).

  Also, instead of repeating the discharge of articles from all weighing hoppers a plurality of times, there is also a method in which a normal combination weighing is repeated a plurality of times and the deviation between the total discharge amount and the combination target value is combined as a final target value. (See Patent Document 3).

Further, there is also a method of converting the total discharge amount into a number, and performing combination counting using a deviation between the obtained total discharge number and the combination target number as a final target number (see Patent Document 4).
In these patent documents, combination counting is used for the number combination, and combination weighing is performed for the combination of masses. However, the counting device only converts the mass to the number, and the device configuration as hardware is the weighing device. Therefore, in the following description, the combination weighing device is based on the concept including both without distinguishing these.

Japanese Patent Publication No. 55-48249 Japanese Examined Patent Publication No. 2-02089 Japanese Patent Publication No. 4-14289 Japanese Patent Publication No. 6-27666

  By the way, when the combination target value exceeds a predetermined value that can be measured by one combination weighing, the total discharge amount (total discharge number) discharged from each weighing hopper multiple times and the combination target value (target number) The combination weighing is performed using the deviation as the final target value. However, depending on the final target value that is the deviation, the operation rate of the combination weighing device may be deteriorated and the measurement accuracy may be deteriorated.

  For example, when weighing industrial standard products such as bolts and nuts that have almost no variation in unit mass, the combined addition value of each weighing hopper gathers around an integral multiple of the unit mass, so the final target value is If it deviates from the vicinity of the integral multiple, the combination cannot be established, and the operating rate deteriorates due to this. In order to improve it, if the upper and lower limit values of the final target value are set softly, the measurement accuracy will deteriorate this time.

  In this way, the present invention is intended to solve the peculiar problem of repeating a plurality of discharges and measuring a constant mass (a constant number). For example, the discharge of an article is performed only when the set target value is met. It is an object of the present invention to provide a new weighing device that can perform combination weighing without reducing the operation rate even when strict weighing accuracy that does not allow the measurement is required.

In the combination weighing device according to the present invention, when the combination target value cannot be satisfied by the discharge of the article by the combination, the article is discharged from the hopper that has been weighed to obtain the accumulated value of the discharge amount, and the accumulated value and the combination target A combination weighing device that combines a deviation from a value as a final target value,
A setting unit configured to set a first target value for determining the deviation and a second target value less than the first target value, and further, after the cumulative value reaches the second target value, the articles from individual hoppers that have been weighed The final target value adjusting unit is provided to sequentially discharge the accumulated value and to reach the first target value.

  Here, the case where the combination target value cannot be satisfied by the discharge of articles by combination is, for example, that the maximum mass that can be measured with one weighing hopper is 400 g, and theoretically it can be measured up to 4000 g with a device having 10 of them. Since articles are randomly supplied to each hopper, in consideration of safety, 300 g per hopper, for example, 3000 g as a whole is set as the upper limit of measurement, and even if a target value exceeding it is set, depending on discharge of articles by combination weighing, This is a case where an article having a target value cannot be obtained. Therefore, for example, in a weighing device with an upper limit of 3000 g, when a combination target value exceeding 3000 g, for example, 5000 g, is set, the combination discharge is not performed at first and the articles are discharged from all hoppers that have finished weighing. While repeating, the discharge amount is accumulated, and when the accumulated value reaches a second target value, for example, 4000 g, articles are individually discharged from each hopper. When the cumulative value thus discharged reaches the first target value, for example, 4500 g, this time, the absolute value of the deviation between the cumulative value of the previous discharge and the combined target value (500 g in the above example) Is combined and weighed as the final target value.

  Therefore, in use, the first target value and the second target value are set in addition to the combination target value. For example, if the combination target value is 5000 g (if the unit mass is 5 g, the number target value is 1000 pieces), the first target value is set to 4000 g (800 pieces) and the second target value is set to 4500 g (900 pieces). deep. Alternatively, the first target value may be set to 90% of the combined target value, and the second target value may be set to 80%. However, these numerical values are examples, and are not limited to these. And if the combination target value is 5000g and the first target value is 4500g, the deficit will be 500g, so if that absolute value is the final target value, will that value be an integral multiple of the combined addition value? Confirm whether or not. As described above, when the object to be weighed is an industry standard product, the combination addition value of the article gathers around an integral multiple of the single mass, and the combination is not established unless the final target value is close to the integral multiple. It becomes. Therefore, it is confirmed in advance whether or not this final target value is an integral multiple of the single mass, and if it is not an integral multiple, the first target value is adjusted. On the other hand, the second target value may be a rough value.

  When these preparations are made, the apparatus is operated and weighs while supplying articles to each weighing hopper. And if a measured value is obtained, those measured values (mass of articles or the number of articles) will be accumulated, and articles will be discharged from each hopper. The hopper, which has been emptied after being discharged, is again supplied with articles and repeatedly weighed and discharged. Such a process is repeated until the cumulative value of the discharge amount reaches the second target value. Therefore, when it is desired to speed up this process, the amount of conveyance of the upper supply feeder is increased to increase the amount of supply to each hopper. However, since the maximum supply amount in the case of piece counting needs to be kept within the range where the number can be discriminated, for example up to 100 pieces, no measurement error will occur, but if it is supplied beyond that, ± 1 If errors occur, keep the supply within 100.

  When the cumulative value of the discharge amount reaches the second target value (4000 g in the above example), the articles are sequentially discharged from the individual hoppers that have finished weighing. That is, at this stage, articles are discharged in order from the individual hoppers that have been weighed so that the cumulative amount of discharge reaches the first target value (4500 g in the above example). Accordingly, during this time, the conveyance amount of the supply feeder is reduced so that articles are supplied to the empty hopper little by little.

  Thus, when the cumulative value of emissions reaches the first target value (eg, 4500 g), the cumulative value of emissions (eg, 4510 g) up to that point is subtracted from the combined target value (eg, 5000 g), and its absolute value Is set to the final target value here (490 g in the above example), and combination weighing is performed. That is, since new articles are supplied to the empty hopper, a combination that matches the final target value is selected by combining the measured values of these hoppers. In this case, the final target value is in the vicinity of an integral multiple of the unit mass by the above-described adjustment, and therefore the probability that the combination is not established is very small. In this way, when the discharge amount so far and the discharge amount by the last combination weighing are added, the article having the combination target value is completed. Such a measurement method is referred to as “integrated measurement” in the following description.

  In this way, according to the present invention, the final target value when performing combination weighing is determined by the first target value, and after the accumulated value of the discharge amount reaches the second target value, the articles are sequentially discharged from each hopper. Thus, since the final target value is adjusted so that the cumulative value of these emission amounts reaches the first target value, combination failure can be avoided even if combination weighing is performed with the final target value.

  By the way, when the combination target value exceeds the above-described measurement upper limit, there is a measurement method in which the combination target value is divided into N and the combination measurement is repeated N times with one target value (set target value / N). However, N is an integer. Such a measurement method is referred to as “count measurement”. However, when the target value is reached by several times of measurement, the number of times measurement may be processed earlier.

  Therefore, the combination weighing device according to the present invention, when the combination target value cannot be satisfied by the discharge of articles by combination, the number measurement mode in which the combination measurement is repeated N times with the target value obtained by dividing the combination target value into N, and the N It is further characterized by further comprising a number setting unit for setting the number of times and a switching unit for switching to the number measurement mode if the N times are set without setting the first target value.

  At the time of use, it is determined whether to perform integral weighing or count weighing in consideration of the upper limit of measurement and the combination target value. Then, the combination target value, the first target value, and the second target value are set for the integrated measurement, and the combination target value and the number N are set for the count measurement. In this case, the first target value is set to zero as an initial value.

  When driving, first, the switching unit checks the first target value and the number of times N. If a numerical value other than zero is set for the first target value, the mode is switched to the integrated weighing mode. If the first target value is zero and the number of times N is not zero, the mode is switched to the number of times measuring mode. As a result, when the operating condition is called up, it is possible to automatically switch to integrated measurement or count measurement, so that even an operator unfamiliar with the apparatus can operate the apparatus under appropriate conditions.

  According to the present invention, the final target value when performing combination weighing is limited by the first target value, and after the accumulated value of the discharged amount reaches the second target value, the individual hoppers that have finished weighing The products are discharged sequentially from the factory and adjusted so that the cumulative value of the previous emissions reaches the first target value.By simply setting the final target value in advance, it is an industrial standard product that is difficult to achieve a combination. Even so, it can be reliably measured by combination weighing. Therefore, the operating rate of the apparatus is improved, and an article that matches the combination target value can be measured, so that an apparatus with extremely high weighing accuracy can be obtained.

  In addition, according to the present invention, if the first target value is zero and the number of times N is set, the measurement is automatically switched to the number of times measurement. Therefore, the combination weighing is performed in an appropriate weighing mode according to the size of the combination target value. It can be performed. Therefore, even an operator unfamiliar with the apparatus can operate the apparatus under appropriate conditions.

1 is a schematic configuration diagram of a combination weighing device according to an embodiment of the present invention. The configuration block diagram of the embodiment. The flowchart of the basic operation | movement of the said embodiment. The flowchart in the case of performing integral measurement. The detailed flowchart of subroutine SUB1 of integral measurement. The detailed flowchart of subroutine SUB2 of integrated measurement. The flowchart in the case of performing count measurement.

  Hereinafter, an embodiment of a combination weighing device according to the present invention will be described with reference to the drawings. The following embodiments do not limit the technical scope of the present invention.

FIG. 1 is a schematic configuration diagram of an embodiment of a combination weighing device according to the present invention. In this figure, a combination weighing device 100 includes a dispersion feeder DF arranged at the upper center of the device, a plurality of radiation feeders RF arranged radially around the dispersion feeder DF, and each radiation feeder RF. A plurality of pool hoppers PH arranged in the lower stage, and the same number of weighing hoppers WH arranged in the lower stage, and a collective chute CS arranged below and collecting articles discharged from each weighing hopper WH And a timing hopper TH that is disposed below the collective chute CS and temporarily holds the discharged articles.
In FIG. 1, only the radiation feeders RF, the pool hopper PH, the weighing hopper WH, and the collective chute CS on both sides facing each other are illustrated, but a plurality of these are set at equal intervals around the dispersion feeder DF. To be arranged.

  The dispersion feeder DF includes an electromagnetic feeder (not shown) and a conical diaphragm VP attached to the movable portion thereof, and the diaphragm VP is supplied on the diaphragm VP by reciprocating up and down spirally. The manufactured article G is dispersed in the circumferential direction. The dispersion feeder DF is supported by a mass sensor S (see FIG. 2), and detects the mass of the article G loaded thereon. Further, a cross feeder (not shown) is arranged above the dispersion feeder DF, and the cross feeder is controlled to be turned on / off based on the mass detected by the mass sensor S, whereby an article G having a predetermined mass is placed on the diaphragm VP. Can be stored in a timely manner.

  The radiation feeder RF includes an electromagnetic feeder (not shown) and a trough T attached to the movable part, and the trough T reciprocates in the front-rear direction, thereby conveying the article G on the trough T forward. The article G is supplied from the leading end to the lower pool hopper PH. In addition, the troughs T of each radiation feeder RF are arranged radially adjacent to each other, but in order to prevent the leakage of the article G from between the adjacent troughs T, one of the troughs T adjacent to each other. The side wall overlaps the side wall of the other trough.

  The pool hopper PH temporarily stores the articles G discharged from the radiation feeder RF. When the lower weighing hopper WH becomes empty, the gate opens and closes based on a command from the control unit CU described later, and is stored there. The discharged article G is discharged to the lower weighing hopper WH.

  The weighing hopper WH is supported by the mass sensor WS shown in FIG. 2, and the mass detected by the sensor WS is converted into a digital quantity and input to the control unit CU. At this time, the mass of the hopper itself is stored as a tare, and the mass of the article supplied to the weighing hopper WH is detected by subtracting the tare mass from the detected mass.

  Since such a configuration is well known, detailed description of each hopper is omitted here, but a mechanism for opening and closing these gates and a mass sensor WS are housed in the main body B, and the above-described electromagnetic feeder and dispersion feeder are included. The mass sensor S that supports the DF is housed in a cover C at the top of the main body B. The main body B is mounted on the gantry A via the support legs L.

  FIG. 2 is a block diagram showing the configuration of the combination weighing device 100 according to this embodiment. In this figure, the control unit CU is configured by a computer, and stores therein a CPU 10, a ROM 11, a RAM 12, a hard disk 13, and the like. These devices are connected to each other via bus lines such as an address bus and a data bus.

  The control unit CU is connected to the dispersion feeder DF, the radiation feeder RF, the pool hopper PH, the weighing hopper WH, the timing hopper TH, and the operation unit RU via the interface 14. In addition, the measurement value converted into a digital quantity is input to the control unit CU from the above-described mass sensor S and mass sensor WS.

  Various programs are stored in the ROM 11, and the CPU 10 reads out and executes the programs, thereby performing control on the distributed feeder DF, control on the radiation feeder RF, and gate opening / closing control on the pool hopper PH, the weighing hopper WH, and the timing hopper TH. Is called.

  The CPU 10 executes operations based on the flowcharts of FIG. 3 to FIG. 7 by executing the main program. Since these will be described later, the combination weighing executed by the CPU 10 will be described here.

  In combination, the CPU 10 first inputs a measured value from each weighing hopper WH, and in the case of the number combination, it is divided by a single mass and converted into a number. Next, the respective measured values (mass or number) are combined, and the combination whose combined addition value is closest to the target value within the upper and lower limits is selected. However, when the upper limit value is not set, the lower limit value becomes the target value, so a combination that matches the target value is selected. The gate of the selected weighing hopper WH is opened and closed under the control of the CPU 10, and the articles stored therein are discharged to the collecting chute CS.

  When the article is discharged, the CPU 10 opens and closes the gate of the upper pool hopper PH with respect to the emptied weighing hopper WH, and supplies the article to the emptied weighing hopper WH. Subsequently, the upper radiation feeder RF and the dispersion feeder DF corresponding to the upper radiation feeder RF and the dispersion feeder DF are driven at a predetermined vibration intensity and vibration time, and the article is supplied from the radiation feeder RF to the empty pool hopper PH. Thus, one metering cycle is completed. Therefore, in the following description, when an article is supplied to the empty weighing hopper WH, it means that the gate of the pool hopper PH is opened and closed and the radiation feeder RF is subsequently driven.

  Further, when driving the radiation feeder RF, the vibration intensity and vibration time set in advance are read from the hard disk 13 and driven. In this case, it is set by a trial run or a learning function as to how much vibration intensity and vibration time the desired conveyance amount is.

Further, the CPU 10 implements a function as the final target value adjustment unit 15 and a function as the switching unit 16 by executing the program.
After the accumulated value of the discharge amount reaches the second target value every time, the final target value adjusting unit 15 removes articles from the individual weighing hoppers WH that have finished weighing until the accumulated value reaches the first target value. We discharge sequentially. Since the discharge amount at this time is small, the cumulative value of the discharge amount gradually approaches the first target value. If the cumulative value of the discharge amount so far reaches the first target value, the absolute value of the deviation between the cumulative value and the combination target value is set as the final target value of the combination weighing to be executed last. In this way, the final target value when performing combination weighing is adjusted by the adjustment unit 15.

  On the other hand, the switching unit 16 switches the operation mode of the apparatus to the cumulative measurement mode or the count measurement mode. For example, if a numerical value other than zero is set for the first target value, the mode is switched to the integrated weighing mode, and if the first target value is zero and the count metering N is set, the mode is switched to the count metering mode. In this case, the first target value and the initial value of the number of times N are each set to zero.

  The operation unit RU includes a liquid crystal display, has a touch panel function, and can be set by an operator. For example, on the reservation screen, the combination target value (mass or number), single unit mass, first target value (percentage of the combination target value or mass or number corresponding thereto), second target value (the ratio% or corresponding mass) Or the number) can be registered for each product, and the number N of counts can be set. Therefore, this reservation screen functions as the setting unit 17 for setting the first target value and the second target value, and also functions as the number setting unit 18 at the same time. These setting values are registered in the hard disk 13.

  The carry amount of the radiation feeder RF is determined by the vibration intensity and the vibration time of the electromagnetic feeder, and these set values can be set and registered from the operation unit RU. Further, the set values are automatically updated by the learning function. In addition, in the case of integrated weighing, in particular, in the process of registering two types of vibration strengths, large and small, and repeating all discharges to the second target value, the large amount of vibration is read to increase the supply amount, and the cumulative value is After reaching the second target value, until the first target value, a small vibration intensity is read to reduce the supply amount supplied to each hopper. These setting values are also registered in the hard disk 13.

  However, the supply amount to each weighing hopper WH is limited to a range in which no weighing error occurs. For example, if the number of bolts is up to 100, no error occurs when converting the number, but if the number exceeds 101, if there is a possibility of an error, the amount supplied to each weighing hopper WH is set to 100 or less.

Next, various operations performed by the CPU 10 will be described based on the flowcharts of FIGS.
First, when the power switch is turned on, the CPU 10 displays a reservation screen for setting operating conditions on the operation unit RU, and executes the key processing of FIG. 3 (step S1). That is, in this step S1, for the product to be integrated and weighed, the combination target value, the first target value, the second target value, and the magnitude of vibration intensity of the radiation feeder RF are set and registered for each product from the reservation screen. In addition, for a product for which count measurement is performed, a combination target value and a count N for measurement are set and registered for each product. When counting pieces, the unit mass of each product is also set and registered.

  If such reservation registration has been completed, registration data of a product to be weighed is called from the operation unit RU. Then, the CPU 10 reads out registration data (combination target value, first target value, second target value, simple substance mass, number of times N, etc.) of the product and sets it in a predetermined register. Subsequently, when the start key 17 of the operation unit RU is operated (step S2), the CPU 10 starts operation (step S3).

  When the operation is started, the CPU 10 first inputs a measurement value of each weighing hopper WH. However, since each weighing hopper WH is initially empty, the upper pool hopper PH is immediately driven, and then the radiation feeder RF and the dispersion feeder DF are driven. The vibration time of each radiation feeder RF at this time is set to be large. While such processing is repeated a plurality of times, articles are sequentially supplied to the pool hopper PH and the weighing hopper WH, respectively.

  Next, in step S4, the CPU 10 checks whether or not the first target value set in the register is zero. If it is not zero, the process proceeds to an integrated weighing subroutine, and if it is zero, the process proceeds to a count weighing subroutine. Therefore, this step S4 functions as the aforementioned switching unit.

As a result of the check, if a numerical value other than zero is set as the first target value, the process proceeds to the integrated weighing subroutine, and FIG. 4 will be described next.
In FIG. 4, the CPU 10 first executes a subroutine (SUB1) and then executes a subroutine (SUB2). Since the first subroutine (SUB1) is described in detail in FIG. 5, and the next subroutine (SUB2) is described in detail in FIG. 6, FIG. 5 will be described first.

  In FIG. 5, the CPU 10 sets the accumulated value to zero (step S10). This cumulative value is a cumulative value of the discharge amount (measurement value) discharged from each weighing hopper WH, and is initially set to zero because nothing is discharged. Subsequently, after the article is supplied to the empty weighing hopper WH (step S11), the number n of the weighing hopper WH is set to 1 (step S12). This number n is a number assigned to each weighing hopper WH. When ten hoppers are arranged, the numbers n are numbered 1 to 10.

  In the next step S13, the weighing value of the first weighing hopper WH is added to the above-mentioned accumulated value, and the aforementioned accumulated value is updated with the added value. Therefore, when n = 1, the first measured value is the cumulative value. Subsequently, it is checked whether the accumulated value is equal to or larger than the second target value (step S14). However, since the first cumulative value is smaller than the second target value, it is checked in step S15 whether n is m. Here, m is the number of the last weighing hopper WH, and m = 10 when ten weighing hoppers WH are used. Since n = 1 at first, n is incremented by 1 in the next step S16, and the process returns to step S13. In step S13, the measured value of the n = 2th weighing hopper WH is added to the accumulated value, and the previous accumulated value is updated with the added value. Thereby, the cumulative value when n = 2 is an addition value of the measurement value of the first weighing hopper WH and the measurement value of the second weighing hopper WH.

  Thus, by repeating the routine processing from step S13 to step S16, the measured values of the respective weighing hoppers WH are accumulated in order, but the accumulated value does not reach the second target value, and n = m. If so, the process proceeds to step S17, the articles are discharged from all the weighing hoppers WH, and the process returns to step S11.

  In step S11, the article is supplied to the weighing hopper WH that has been emptied by discharging the article, and in step S12, n = m is returned to 1, and then the routine of steps S13 to S16 described above is performed. Repeat the process. While repeating such processing, the cumulative value gradually increases, and when the cumulative value becomes equal to or larger than the second target value, the process proceeds to step S18 at that time, and 1 added so far. The articles are discharged from the nth to nth weighing hoppers WH. As a result, the subroutine SUB1 ends, and the process proceeds to the subroutine SUB2 in FIG.

  Moving to FIG. 6, the CPU 10 first supplies the article to the emptied weighing hopper WH in step S19. At this time, the vibration time of the radiation feeder RF is set to be small. Subsequently, the CPU 10 selects the weighing hopper WH to discharge the article next while looking at the weighing value of each weighing hopper WH (step S20). For example, when there is a sufficient margin until the cumulative value of the discharge amount reaches the first target value, the weighing hopper WH having a large measured value is preferentially selected. Thereby, in step S24, when a new article is supplied to the empty weighing hopper WH, a smaller quantity of articles is supplied than the previous time. When the accumulated value approaches the first target value, the weighing hopper WH having a smaller measured value is selected. When the weighing hopper WH to be discharged is selected in this way, in the next step S21, the weighing value of the designated weighing hopper WH is added to the accumulated value so far, and the accumulated value so far is updated with the added value.

  Subsequently, the CPU 10 checks whether the updated accumulated value is equal to or larger than the first target value (step S22). At first, since the accumulated value is smaller than the first target value, the process proceeds to step S23, the article is discharged from the designated weighing hopper WH, and then the article is supplied to the empty weighing hopper WH (step). S24). Thus, while repeating the routine processing from step S20 to step S24, the cumulative value is brought close to the first target value, and when the cumulative value matches or exceeds the first target value, in step S25, first. The article is discharged from the designated weighing hopper WH, and the process proceeds to step S26 in FIG. 4, where the article is supplied to the empty weighing hopper WH.

  Returning to FIG. 4, in the subsequent step S27, the above-mentioned cumulative value is subtracted from the preset combination target value to obtain the final target value, and in the next step S28, the combination that matches the obtained final target value is selected. To do. If it can be selected, in the subsequent step S29, the article is discharged from the selected weighing hopper WH. As a result, since the articles of the combination target value that have been discharged so far are stored in the lowermost timing hopper TH, after the articles are discharged to the lower packaging device or the like (step S30), the stop key is pressed in the subsequent step S31. Check. If the stop key is ON, the operation is terminated, and if it is OFF, the process returns to step SUB1 to repeat the above integrated weighing.

  Next, returning to step S4 in FIG. 3, if the first target value is zero, the process proceeds to the count measurement. Next, the flow of the count measurement in FIG. 7 will be described.

  In FIG. 7, the CPU 10 first checks whether or not the set number of times N is zero (step S32). If it is zero, the first target value is also zero. In this case, the routine proceeds to a routine for combination weighing. If it is not zero, the combination target value set in the subsequent step S33 is divided by N times. The quotient is set as the first target value. In this case, since N is an integer, it may not be divisible by the value. In preparation for this, the number of times is measured while correcting the target value every time.

  The CPU 10 first selects a combination with the target values divided into N, discharges the articles from the selected weighing hopper WH, and supplies new articles to the empty weighing hopper WH (step S34). Subsequently, the CPU 10 obtains a deviation between the discharged amount of the discharged article and the initial target value, and corrects the next target value with the deviation (steps S35 and S36). Subsequently, the CPU 10 decrements the set number N by 1 (step S37), and repeats the routine processing from step S38 to step S34 until the number N becomes zero. Thus, the target value divided into N is subjected to combination weighing while being corrected each time. Therefore, even if the discharge amount is deviated every time, the previous deviation is corrected by each combination weighing.

  When the number N of times becomes zero, articles of the set combination target value are accumulated in the timing hopper TH. After discharging the articles to the lower packaging apparatus or the like (step S39), in the subsequent step S40 Check stop key. If the stop key is ON, the operation is terminated, and if it is OFF, the process returns to step S33, and the above-mentioned measurement is repeated.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this. For example, in the above description, the case where an industrial standard product having almost no variation in the single unit mass is combined and weighed with an accuracy that does not allow one error, but if this is developed into an article having a variation in the single unit mass. It is clear that more accurate combination weighing can be realized.
Further, the mass sensor WS is also mounted on the pool hopper PH, and the feed amount to the pool hopper PH is feedback controlled based on the detected mass of the mass sensor WS while the weighing hopper WH is weighing the article. Is also possible. Then, since the final target value can be further finely adjusted, it is possible to provide a device with a high operating rate that does not cause a combination failure.

15 final target value adjustment unit 16 switching unit 17 setting unit 18 times setting unit 100 combination weighing device WH weighing hopper (hopper)
PH Pool Hopper RF Radiation Feeder (Feeder)
CU control unit

Claims (3)

When the combination target value cannot be satisfied by the discharge of articles by the combination, the accumulated value of the discharge amount is obtained by discharging the articles from the hopper that has been weighed, and the deviation between the total value and the combination target value is combined as the final target value. A combination weighing device,
A setting unit configured to set a first target value for determining the deviation and a second target value less than the first target value, and further, after the cumulative value reaches the second target value, the articles from individual hoppers that have been weighed And a final target value adjusting unit that sequentially discharges the accumulated value to reach the first target value.   The number measurement mode in which the combination measurement is repeated N times with the target value obtained by dividing the combination target value into N times, the number setting unit for setting the N times, the first target value is not set, and the N times are set. The combination weighing device according to claim 1, further comprising a switching unit that switches to the count weighing mode.   Provided with a feeder for conveying articles to the hopper, until the cumulative value reaches the second target value, the feeder is driven with a large conveyance amount, and the cumulative value exceeds the second target value, The combination weighing apparatus according to claim 1, further comprising a controller that drives the feeder with a small conveyance amount until the first target value is reached.

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