JP2005091123A - Combined weighing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined weighing apparatus capable of automatically setting the feeding timing properly for feeding the subject to be weighed. <P>SOLUTION: The motional timing for transmitting the specimen of weighing through the feeding trough 20, pool hopper 30, weighing hopper 40, and collection part 50, is changed on the basis of the positional relation of these parts (L1, L2, L3, θ, etc.,). Thereby, the motional timing can be automatically set at proper value without personal difference. Moreover, the actual time needed after the pool hopper 30 sent out the specimen till its head arrives at the bottom of the weighing hopper 40 is obtained while referring to the weighing signal W1 outputted from the weighing means 42, and the motional timing is changed based on the time obtained by the actual measurement. By processing like this, the motional timing can be automatically set at the proper value regardless of volume and kind of the specimen of weighing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a combination weighing device that weighs each weight of a plurality of objects to be weighed and performs a combination calculation thereof.

  A combination weighing device that measures an object to be weighed, such as confectionery and fruit, having a variation in individual weights so as to have a total weight within an allowable range has been conventionally known as disclosed in, for example, Patent Document 1. . In the combination weighing device, the objects to be weighed are distributed into a plurality of weighing hoppers connected to a weighing means such as a load cell, the respective weights of the objects to be weighed held in the weighing hoppers are weighed, and the combination calculation thereof is performed. The weighing hopper that discharges the object to be weighed is selected.

  Such a combination weighing device may include a plurality of hoppers that temporarily hold an object to be weighed, such as a pool hopper and a booster hopper, in the upper and lower stages of the plurality of weighing hoppers. All hoppers such as pool hoppers, weighing hoppers, booster hoppers, etc. have an open / close gate at the bottom, and when the open / close gate is closed, the object to be weighed can be held inside and the open / close gate is opened. The object to be weighed can be sent downward. Further, such a combination weighing device is configured such that a conveying unit for distributing and feeding the objects to be weighed to the uppermost hopper group, and objects to be weighed discharged from the lowermost hopper group, are further stacked. Timing hopper for sending to That is, such a combination weighing device is sent downwardly in stages via a transport unit, a pool hopper, a weighing hopper, a booster hopper, a timing hopper, and the like.

JP 2001-330505 A

  In the combination weighing device as described above, for example, when a certain weighing hopper is selected by the combination calculation, the weighing hopper opens the open / close gate to send the object to be measured downward. Then, the pool hopper located immediately above the weighing hopper that has become empty opens the open / close gate to send other objects to be weighed therein toward the weighing hopper.

  In such a feeding operation, from the viewpoint of a request for high-speed weighing, it is desirable to shorten the time from when the opening / closing gate of the weighing hopper is opened to when the opening / closing gate of the pool hopper immediately above is opened as much as possible. . However, it is necessary that the weighing hopper open / close gate be closed when the object to be weighed sent from the pool hopper arrives at the bottom of the weighing hopper at the latest, and that the opening timing of the pool hopper open / close gate is too early. The sent object to be weighed is not properly held in the weighing hopper, which hinders reliable weighing.

  Accordingly, in order to perform high-speed and reliable weighing, it is required to set an appropriate time from the time when the opening / closing gate of the weighing hopper is opened to the time when the opening / closing gate of the pool hopper immediately above is opened. It becomes a problem. In addition, this problem is not limited to the timing of such a feeding operation between the weighing hopper and the pool hopper directly above it, but the upper and lower portions of the above-described transport unit, pool hopper, weighing hopper, booster hopper, timing hopper, etc. It becomes a required subject about the timing of the feeding operation between any two parts adjacent to the.

  Conventionally, since the timing of these feeding operations is set by an operator based on his / her own judgment, the setting varies among individual operators, and is not necessarily an appropriate setting. Further, even if the setting is appropriate by the operator, the setting may become inappropriate depending on the surrounding environmental changes (temperature change, humidity change, etc.) and the properties of the object to be measured.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a combination weighing device capable of automatically and appropriately setting an operation timing for sending an object to be weighed.

  The invention according to claim 1 is a combination weighing device that measures each weight of a plurality of objects to be weighed and performs a combination calculation of the respective weights, and a plurality of conveying units that convey the objects to be weighed, A plurality of hoppers for holding and delivering the objects to be weighed, a collecting unit for collecting and discharging the objects to be weighed selected by the combination calculation, the plurality of transport units, the plurality of hoppers, and the collecting unit The operation timing based on a physical quantity indicating a positional relationship among a storage unit that stores an operation timing for sending an object to and from the plurality of transport units, the plurality of hoppers, and the assembly unit And a first changing means for changing.

  The invention according to claim 2 is the combination weighing device according to claim 1, wherein the plurality of hoppers are received from a plurality of pool hoppers that temporarily hold an object to be weighed and the plurality of pool hoppers. A plurality of weighing hoppers for weighing the objects to be weighed, a plurality of weighing means for weighing the objects to be weighed held by the plurality of weighing hoppers, and a weighing output from at least one of the weighing means And a second changing means for changing the operation timing between the pool hopper and the weighing hopper based on the signal.

  The invention according to claim 3 is the combination weighing device according to claim 2, wherein the operation timing other than between the pool hopper and the weighing hopper is changed based on the physical quantity and the weighing signal. It further comprises a changing means.

  The invention according to claim 4 is the combination weighing device according to claim 2 or claim 3, wherein the weighing signal is a signal output at the time of weighing the object to be weighed immediately after the zero point adjustment is performed. It is characterized by being.

  The invention according to claim 5 is the combination weighing device according to any one of claims 1 to 4, wherein the time for sending an object to be weighed between parts other than between the weighing hopper and the pool hopper is as follows. It is further characterized by further comprising measurement means for measuring an actual measurement value, and fourth change means for changing the operation timing based on the actual measurement value.

  According to the first to fifth aspects of the present invention, the operation timing for sending the objects to be weighed among the plurality of transport units, the plurality of hoppers, and the collecting unit is set to the positional relationship between these parts. Change based on. For this reason, the operation timing can be automatically set to an appropriate value without individual differences. Also, even when partial changes or improvements are made to the combination weighing device, it is possible to easily reset the operation timing simply by correcting and inputting the physical quantity indicating the positional relationship between the parts. It becomes possible.

  In particular, according to the second aspect of the present invention, the operation timing for sending the object to be weighed is changed with reference to the weighing signal output from the weighing means. For this reason, after the pool hopper sends out the object to be weighed, it is possible to obtain an actual measurement value of the time required for the head to apply a load to the weighing hopper, and based on the actual measurement value, the distance between the pool hopper and the weighing hopper can be obtained. The operation timing can be changed. Therefore, the operation timing between the pool hopper and the weighing hopper can be automatically set to an extremely appropriate value regardless of the amount and type of the objects to be weighed.

  In particular, according to the invention described in claim 3, the operation timing for sending the object to be weighed is changed with reference to the physical quantity indicating the positional relationship of each part and the weighing signal output from the weighing means. For this reason, after the pool hopper sends out the object to be weighed, the operation timing other than between the pool hopper and the weighing hopper is calculated more appropriately based on the measured value of the time required for the load to be applied to the weighing hopper. And can be set automatically.

  In particular, according to the invention described in claim 4, it is possible to obtain a more accurate measured value by referring to the weighing signal obtained after the weighing hopper is made hollow and stable, and the operation timing is determined based on the measured value. Furthermore, an appropriate value can be automatically set.

  In particular, according to the fifth aspect of the present invention, the operation timing for sending the object to be weighed based on the actual measurement value of the time during which the object to be weighed moves between the parts other than between the weighing hopper and the pool hopper. Can be changed. Therefore, the operation timing can be automatically set very appropriately between the parts other than between the weighing hopper and the pool hopper regardless of the type and amount of the objects to be weighed.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

<1. Configuration of Combination Weighing Device 1>
First, the configuration of the combination weighing device 1 according to the present invention will be described. FIG. 1 is a side sectional view schematically showing the configuration of the combination weighing device 1, and also shows an electrical connection with the control unit 60. FIG. 2 is a top view of the combination weighing device 1. The combination weighing device 1 is a device that measures an object to be weighed with variations in individual weights so as to have a total weight within an allowable range, and mainly includes a dispersion feeder 10, a plurality of supply troughs 20, and a plurality of pool hoppers. 30, a plurality of weighing hoppers 40, and a collecting unit 50.

  The dispersion feeder 10 is a part for receiving an object to be weighed in from the upper supply means 100 and dispersing and conveying the object to be weighed to a plurality of supply troughs 20 arranged outward. The dispersion feeder 10 has a substantially circular shape when viewed from above, and the upper surface has a conical shape with a center raised. Since the dispersion feeder 10 is connected to the vibration means 11 using electromagnetic vibration or the like, the upper surface of the dispersion feeder 10 can be vibrated by driving the vibration means 11, and thereby the object to be weighed. Can be distributed and transported outward.

  The plurality of supply troughs 20 are parts that function as conveying means for sending the objects to be weighed dispersed by the dispersion feeder 10 to the plurality of pool hoppers 30 respectively. As shown in FIG. 2, the plurality of supply troughs 20 are arranged radially along the outer periphery of the dispersion feeder 10, and the outer end portions of the supply troughs 20 are located above the plurality of pool hoppers 30. It is arranged to be located. Since each supply trough 20 is connected to the vibration means 21 using electromagnetic vibration or the like, the conveyance surface of the supply trough can be vibrated by driving the vibration means 21. And the supply trough 20 can move a to-be-measured object outward by the vibration, and can send it out to the inside of the corresponding pool hopper 30. FIG.

  The plurality of pool hoppers 30 are parts for temporarily holding the objects to be weighed sent out from the supply trough 20. Each pool hopper 30 is arranged below each supply trough 20, and is arranged in an annular shape in a top view. Each pool hopper 30 is configured to include a cylindrical main body 30a that communicates vertically and a gate 30b that opens and closes its bottom. The gate 30b is connected to an opening / closing driving means 31 such as an air cylinder, and the opening / closing operation of the gate 30b is realized by driving the opening / closing driving means 31. Each pool hopper 30 can hold the object to be weighed therein when the gate 30b is closed, and can send the object to be weighed to the weighing hopper 40 below when the gate 30b is opened.

  The plurality of weighing hoppers 40 are parts for receiving an object to be weighed sent from the pool hopper 30 and weighing its weight. Each weighing hopper 40 is arranged below each pool hopper 30 and is arranged in an annular shape in a top view like the pool hopper 30. Each weighing hopper 40 is also provided with a cylindrical main body 40a that communicates vertically and a gate 40b that opens and closes its bottom. The gate 40b is connected to an opening / closing driving means 41 such as an air cylinder, and the opening / closing operation of the gate 40b is realized by driving the opening / closing driving means 41. Each weighing hopper 40 can hold the objects to be weighed therein when the gate 40b is closed, and can send the objects to be weighed to the lower collecting portion 50 when the gate 40b is opened.

  Each weighing hopper 40 is connected to weighing means 42 such as a load cell. Each weighing means 42 can weigh the object to be weighed held in the weighing hopper 40 and transmit the measured value to the control unit 60 as a weighing signal W1.

  The collecting unit 50 is a part for collecting and discharging the objects to be weighed sent out from the weighing hopper 40 selected by the combination calculation described later at one place. The collecting unit 50 includes a funnel-shaped sliding surface 50a that covers the lower positions of the plurality of weighing hoppers 40, and one timing hopper 50b that holds an object to be weighed down the sliding surface 50a and discharges it downward in a timely manner. It is the composition which has. The timing hopper 50b is provided with a gate 50c that opens and closes the bottom. The gate 50c is connected to an opening / closing driving means 51 such as an air cylinder, and the opening / closing operation of the gate 50c is realized by driving the opening / closing driving means 51. While the gate hopper 50b is closed, the timing hopper 50b can receive the objects to be weighed down from the sliding surface 50a and collect and hold them in the interior, while holding the gate 50c by opening the gate 50c. An object to be weighed can be sent downward and passed to a subsequent packaging device or the like.

  The combination weighing device 1 includes a control unit 60 conceptually shown in FIG. 1 in addition to the above configuration. The control unit 60 is an electronic device that includes a CPU, a ROM, a RAM, an HDD, and the like. The control unit 60 is electrically connected to the driving locations of the respective parts such as the vibration means 11 and 21 and the opening / closing drive means 31, 41 and 51 described above, and transmits these signals by transmitting predetermined signals. Can be operated and adjusted. The control unit 60 is also electrically connected to the plurality of weighing means 42 described above, and can receive and store the weighing signal W1 transmitted from each weighing means 42. In the control unit 60, a combination calculation process is performed on the plurality of weighing signals W1 stored in this manner, and a combination of the weighing hoppers 40 for feeding the objects to be weighed is determined. Details of the functions provided in the control unit 60 will be described later.

<2. Weighing operation of combination weighing device 1>
Next, the weighing operation of the combination weighing device 1 having the above-described configuration will be described below. In addition, the following series of measurement operations proceeds when the control unit 60 described above electrically operates the drive locations of the respective units.

  First, the objects to be weighed fall from the supply means 100 located above the combination weighing device 1 and are supplied onto the dispersion feeder 10. The object to be weighed receives vibration on the upper surface of the dispersion feeder 10, moves outward on the upper surface of the dispersion feeder 10 having a conical inclination angle, and reaches a plurality of supply troughs 20.

  On the other hand, among the plurality of pool hoppers 30, when there is a hollow pool hopper 30 that has finished sending the objects to be weighed to the lower weighing hopper 40, the transport surface of the supply trough 20 corresponding to the pool hopper 30 is set. Vibrate. The object to be weighed receives this vibration, moves outward on the supply trough 20, and is sent into the pool hopper 30.

  Further, when there is a weighing hopper 40 that is hollow after the objects to be weighed have been sent to the lower collecting portion 50 among the plurality of weighing hoppers 40, the pool hopper 30 positioned above the weighing hopper 40 is By opening the gate 30b, the object to be weighed is sent to the weighing hopper 40.

  When the weighing hopper 40 receives and holds an object to be weighed from the upper pool hopper 30, the weight of the object to be weighed in the weighing hopper 40 is weighed by the weighing means 42 connected to the weighing hopper 40, and its weighing signal W1. Is transmitted to the control unit 60. The control unit 60 receives and stores the weighing signal W1 transmitted from the weighing means 42.

  Then, the control unit 60 performs a combination calculation process on the plurality of weighing signals W1 stored in this manner, and sends out an object to be weighed so that the total weight is within a preset allowable range. A combination of the weighing hopper 40 is selected.

  Each weighing hopper 40 selected by the combination calculation opens the gate 40b when the timing hopper 50b of the collecting unit 50 finishes sending the object to be measured downward and becomes hollow, and sends out the object to be weighed held inside. . The objects to be weighed sent out from the weighing hopper 40 slide down on the sliding surface 50a of the collecting unit 50 and gather in the lower one timing hopper 50b. Then, the gathering unit 50 opens the gate 50c in a timely manner, and sends the objects to be weighed gathered in the timing hopper 50b to a subsequent packaging device or the like.

<3. Feeding operation of weighing object in combination weighing device 1>
As described above, in the combination weighing device 1, the objects to be weighed pass through the supply trough 20, the pool hopper 30, the weighing hopper 40, and the collecting unit 50 in a stepwise manner as indicated by arrows in FIG. 1. Will be sent. Hereinafter, the feeding operation of the objects to be weighed in the combination weighing device 1 will be described in more detail.

  The feeding operation of the object to be weighed is realized by the opening / closing operation of the gates 50c, 40b, 30b of the timing hopper 50b, the weighing hopper 40, and the pool hopper 30, and the vibration operation of the supply trough 20, in order to perform high-speed and reliable weighing. It is desirable to set these operation timings appropriately. FIG. 3 is a diagram showing an example of these operation timings in the combination weighing device 1.

  First, the timing hopper 50b opens the gate 50c at time T1, and feeds the object to be weighed therein downward. Then, the timing hopper 50b continues to open the gate 50c for a time t1, and then closes the gate 50c at time T3. The time T1 at which the timing hopper 50b opens the gate 50c is determined by the relationship with the operation of the subsequent packaging apparatus.

  Next, the weighing hopper 40 selected by the combination calculation opens the gate 40b at time T2 after time ta from time T1, and sends the objects to be weighed therein to the collecting unit 50. Then, the weighing hopper 40 continues the opening of the gate 40b for a time t2, and then closes the gate 40b at time T5. Here, it is desirable that the time T2 when the weighing hopper 40 opens the gate 40b is as early as possible within a range in which the head of the object to be weighed out does not arrive at the bottom of the timing hopper 50b by the time T3. If the time T2 is too early, the delivered object reaches the bottom of the timing hopper 50b by the time T3, and the gate 50c still passes through the open bottom and falls down. Conversely, if the time T2 is too late, the time during which the weighing hopper 40 and the timing hopper 50b are idle increases, and an efficient feeding operation cannot be performed. Therefore, it is necessary to set the time ta so that the time T2 satisfies such a condition.

  Similarly, the pool hopper 30 above the weighing hopper 40 that has performed the feeding operation opens the gate 30b at time T4, which is a time tb after time T2, and the weighing hopper 30 holds the object to be weighed therein. Send to 40. Then, the pool hopper 30 continues the opening of the gate 30b for a time t3, and then closes the gate 30b at time T7. Here, it is desirable that the time T4 when the pool hopper 30 opens the gate 30b is set as early as possible within a range in which the head of the object to be weighed out does not arrive at the bottom of the weighing hopper 40 by the time T5. If the time T4 is too early, the delivered object arrives at the bottom of the weighing hopper 40 by the time T5, and the gate 40b still passes through the open bottom and falls down. On the contrary, if the time T4 is too late, the time during which the pool hopper 30 and the weighing hopper 40 are idle increases, and an efficient feeding operation cannot be performed. Therefore, the time tb needs to be set so that the time T4 satisfies such a condition.

  Further, similarly, the supply trough 20 above the pool hopper 30 that has performed the feeding operation starts a vibration operation at time T6 after time tc after time T4, and the object to be weighed held on the upper surface is moved to the pool hopper. Send to 30. Then, the supply trough 20 stops the vibration operation at time T8 after continuing the vibration operation for time t4. Here, it is desirable to set the time T6 when the supply trough 20 starts the vibration operation as early as possible within a range in which the head of the sent object to be weighed does not arrive at the bottom of the pool hopper by time T7. If the time T6 is too early, the delivered object arrives at the bottom of the pool hopper 30 by the time T7, and the gate 30b still passes through the open bottom and falls down. Conversely, if the time T6 is too late, the time during which the supply trough 20 and the pool hopper 30 are idle increases, and an efficient feeding operation cannot be performed. Therefore, the time tc needs to be set so that the time T6 satisfies such a condition.

  In the combination weighing device 1, the timing hopper 50b, the weighing hopper 40, the pool hopper 30, and the supply trough 20 operate at a predetermined timing as described above, and a series of operations are repeatedly executed. The times ta, tb, and tc described above correspond to the “operation timing” of the present invention, the time ta is the operation timing between the supply trough 20 and the pool hopper 30, and the time tb is the pool hopper 30 and the weighing hopper 40. The time tc is the operation timing between the weighing hopper and the collecting unit 50.

<4. Functions of Control Unit of Combination Weighing Device 1>
Subsequently, in order to appropriately automatically set the times ta, tb, and tc as described above, the functions of the control unit 60 of the combination weighing device 1 will be described in detail below.

  FIG. 4 is a block diagram for explaining the functions of the control unit 60 regarding the setting of the times ta, tb, and tc. As described above, the control unit 60 is electrically connected to the excitation means 21 and the opening / closing drive means 31, 41, 51, and operates and adjusts these drives by transmitting predetermined signals. can do.

  On the other hand, as shown in FIG. 4, the control unit 60 has a storage unit 60a such as an HDD, and can store various information in the storage unit 60a. For example, the above-described times ta, tb, tc, the physical quantity P indicating the positional relationship between the parts of the combination weighing device 1, the weighing signal W1 received from the weighing means 52, and the like can be stored in the storage unit 60a. .

  The physical quantity P is, for example, as shown in FIG. 1, the distance L1 between the outer end of the supply trough 20 and the bottom of the pool hopper 30, and the distance between the bottom of the pool hopper 30 and the bottom of the weighing hopper 40. Information L2, the distance L3 between the bottom of the weighing hopper 40 and the bottom of the timing hopper 50b, the inclination angle θ of the sliding surface 50a, and the like. The physical quantity P is input from input means 61 attached to the control unit 60 and stored in the storage unit 60a. The input means 61 can be specifically realized by a known keyboard or touch panel.

  In addition, the control unit 60 includes a first change unit 60b, a second change unit 60c, and a third change unit 60d as means for changing the times ta, tb, and tc stored in the storage unit 60a. Specifically, these are functions realized by a CPU or the like included in the control unit 60.

  First, the first changing means 60b is means for changing the times ta, tb, and tc with reference to the physical quantity P stored in the storage unit 60a. As described above, for example, the time ta is within a range in which the gate 50c of the timing hopper 50b is already closed when the top of the weighing object sent from the weighing hopper 40 arrives at the bottom of the timing hopper 50b. It is desirable that the time is as short as possible. That is, the following equation (1) is established when ta ′ is the time required for the top of the delivered object to arrive at the bottom of the timing hopper 50b after the gate 40b of the weighing hopper 40 is opened.

    ta> t1-ta '(1)

  Similarly, regarding the times tb and tc, the time required for the top of the object to be weighed to arrive at the bottom of the weighing hopper 40 after opening the gate 30b of the pool hopper 30 is defined as tb ′, and the supply trough 20 When the time required for the top of the delivered object to arrive at the bottom of the pool hopper 30 after starting the vibration is tc ′, the following equations (2) and (3) are established.

    tb> t2-tb '(2)

    tc> t3-tc '(3)

  Here, the times ta ′, tb ′, and tc ′ are times that can be estimated to some extent based on the physical quantity P indicating the positional relationship between the respective parts. For example, the time required for the object to be naturally dropped can be estimated based on the distances L1, L2, L3, and the time required for the object to slide to slide down the sliding surface 50a. Estimation is possible based on the distance L3 and the angle θ. The first changing means 60b calculates estimated values of times ta ′, tb ′, tc ′ by referring to the distances L1, L2, L3, the angle θ, etc. in the physical quantity P, and calculates them using the above formula ( By substituting into 1) to (3), the times ta, tb, and tc are changed to appropriate values.

  The combination weighing device 1 can automatically set the times ta, tb, and tc to appropriate values without individual differences by referring to the physical quantity P in the first changing unit 60b as described above. In particular, even when partial changes or improvements are made to the combination weighing device 1, the time ta, tb, tc can be easily restored by simply inputting the physical quantity P from the input means 61. It becomes possible to set. For example, when the collecting unit 50 is replaced with one having a different shape, the times ta, tb, and tc are easily reset if the physical quantity P indicating the new distance L3 and the angle θ is corrected and input from the input unit 61. The

  Next, the second changing unit 60c is a unit that changes the time tb with reference to the measurement signal W1 stored in the storage unit 60a. In the second changing means 60c, a time corresponding to the difference from the time when the gate 30b of the pool hopper 30 is opened with reference to the time when the weighing means 42 starts to receive a load from the object to be weighed, in particular, from the weighing signal W1. Is calculated. That is, this time is an actual measurement value of the time tb ′ required for the top of the weighed object to arrive at the bottom of the weighing hopper 40 after the gate 30b of the pool hopper 30 is opened. The second changing means changes the time tb to an appropriate value by substituting the actually measured value of the time tb 'into the above equation (2).

  In the combination weighing device 1, the time tb can be changed based on the time tb ′ as an actually measured value instead of the estimated value by referring to the weighing signal W <b> 1 in the second changing unit 60 c as described above. Therefore, the time tb can be automatically set to an extremely appropriate value regardless of the type and amount of the objects to be weighed.

  The weighing means 42 is present in the same number as the plurality of weighing hoppers 40, and can obtain the weighing signal W1 from each of the plurality of weighing means 42. However, the weighing signals W1 transmitted from all the weighing hoppers 42 are not necessarily referred to. There is no need. For example, for each weighing hopper 40, when the positional relationship with the upper pool hopper 30 and the conditions regarding the feeding operation between them are the same, the weighing signal W1 transmitted from at least one weighing means may be referred to. Then, the time tb related between all the weighing hoppers 40 and the upper pool hopper 30 may be changed based on the one weighing signal W1.

  The weighing signal W1 referred to by the second changing unit 60c is preferably the weighing signal W1 that is output when the weighing object is first weighed after the zero point adjustment is performed by the weighing unit 42. Usually, the zero point adjustment in the weighing means 42 is executed after the object to be weighed in the weighing hopper 40 connected to the weighing means 42 is sent in advance to make the weighing hopper 40 hollow and stable. Therefore, referring to the weighing signal W1 obtained immediately after such a stable state can be obtained, a more accurate measured value of the time tb ′ can be obtained, and the time tb can be changed to a more appropriate value. it can.

  The third changing unit 60d is a unit that changes the times ta and tc with reference to the physical quantity P and the measurement signal W1 stored in the storage unit 60a. As described above, with reference to the weighing signal W1, an actual measurement value of the time tb 'can be obtained. The third changing means 60d calculates the estimated values of the times ta 'and tc' more accurately with reference to the physical quantity P indicating the positional relationship between the parts, using the actually measured value of the time tb 'as a reference. The times ta and tc are changed to appropriate values by substituting the times ta 'and tc' calculated in this way into the above equations (1) and (3).

  In the combination weighing device 1, the third changing means 60 d refers to the physical quantity P and the weighing signal W 1 in this way, thereby calculating the times ta ′ and tc ′ more accurately based on the actually measured value of the time tb ′. be able to. Therefore, the times ta and tc can be automatically set to more appropriate values.

<5. Modification>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the example mentioned above, Various other forms can be taken.

  For example, as shown in FIG. 5, the weighing means 32 may be connected to each of the plurality of pool hoppers 30, and the fourth changing means 60 e may be further provided as shown in FIG. 6. Here, the weighing unit 32 is a unit that measures the weight of the object to be weighed held in the pool hopper 30 and transmits the measured value to the control unit 60 as the weighing signal W2 in the same manner as the weighing unit 42. The fourth changing means 60e is means for changing the time tc with reference to the weighing signal W2 stored in the storage unit 60a. With such a configuration, it is possible to obtain a time tc ′ as an actually measured value instead of an estimated value. By substituting the actually measured value of this time tc ′ into the above equation (1), the time tc can be set to a more appropriate value. Can be changed.

  In the pool hopper 30, the measuring means 32 is not essential, but by providing the measuring means 32 as the measuring means for obtaining the actual measurement value of the time tc ′ in this way, the time tc is set to a more appropriate value. Can be set to Note that the measuring means for obtaining the actual measurement value of the time tc ′ is not limited to such a measuring means 32, and may be a sensor such as a photoelectric sensor provided in the pool hopper 30. Further, the same measuring means may be provided in the timing hopper 50b, and the time ta may be changed with reference to the actually measured value of the time ta '.

  Further, in the above example, the operation timing between the four parts of the supply trough 20, the pool hopper 30, the weighing hopper 40, and the collecting unit 50 has been discussed. It is not limited to four. For example, a booster hopper that temporarily holds an object to be weighed and is to be selected for combination calculation together with the weighing hopper 40 is provided below each weighing hopper 40, and the operation timing between the weighing hopper 40 and this booster hopper The operation timing between the booster hopper and the collecting unit 50 may be automatically set similarly.

  In addition, the design, arrangement, operation, and the like of each member can be changed in various ways within the scope of the present invention.

FIG. 3 is a side sectional view schematically showing the configuration of the combination weighing device 1. It is a top view of the combination weighing device 1. It is the figure which showed an example of the operation timing for sending a to-be-measured object in the combination weighing device. It is a block diagram for demonstrating the function which the control part 60 has regarding the setting of time ta, tb, tc of the combination weighing device. It is the sectional side view which showed typically the apparatus structure which concerns on a modification. In the modification, it is the block diagram which showed the function which the control part 60 has regarding the setting of time ta, tb, tc.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combination weighing device 2 Combination weighing device 10 Dispersing feeder 11 Excitation means 20 Supply trough 21 Excitation means 30 Pool hopper 30b Gate 31 Opening and closing drive means 32 Measuring means 40 Measuring hopper 40b Gate 41 Opening and closing drive means 42 Measuring means 50 Aggregation part 50b Timing hopper 50c Gate 51 Opening / closing drive means 60 Control section 60a Storage section 60b First changing means 60c Second changing means 60d Third changing means 60e Fourth changing means P Physical quantity W1 Weighing signal W2 Weighing signal

Claims (5)

A combination weighing device for weighing each weight of the objects to be weighed and performing a combination calculation of the respective weights,
A plurality of conveyance units for conveying an object to be weighed;
A plurality of hoppers for holding and delivering the objects to be weighed;
A collecting unit for collecting and discharging the objects to be weighed selected by the combination operation;
A storage unit for storing operation timings for sending an object to be weighed between the plurality of transport units, the plurality of hoppers, and the collecting unit;
First changing means for changing the operation timing based on a physical quantity indicating a positional relationship between the plurality of transport units, the plurality of hoppers, and the collecting unit;
A combination weighing device comprising: The combination weighing device according to claim 1,
The plurality of hoppers are
A plurality of pool hoppers for temporarily holding an object to be weighed;
A plurality of weighing hoppers for weighing the objects to be weighed received from the plurality of pool hoppers;
A plurality of weighing means for weighing the objects to be weighed held by the plurality of weighing hoppers;
Second changing means for changing the operation timing between the pool hopper and the weighing hopper based on a weighing signal output from at least one of the weighing means;
A combination weighing device further comprising: The combination weighing device according to claim 2,
The combination weighing device further comprising a third changing means for changing the operation timing other than between the pool hopper and the weighing hopper based on the physical quantity and the weighing signal. A combination weighing device according to claim 2 or claim 3,
The combination weighing device according to claim 1, wherein the weighing signal is a signal output when weighing an object to be weighed immediately after the zero point adjustment is performed. A combination weighing device according to any one of claims 1 to 4,
Measuring means for measuring an actual measurement value of a time for sending an object to be weighed between parts other than between the weighing hopper and the pool hopper;
Fourth changing means for changing the operation timing based on the actual measurement value;
A combination weighing device further comprising:

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