Measuring device

Abstract

To provide a measurement device which can reduce variation in the accuracy of measurement of each measurement unit even when the measurement device has a plurality of measurement units.SOLUTION: A measurement device includes: a plurality of conveyance units arranged in a direction perpendicular to a conveyance direction; a plurality of measurement units connected to the conveyance units, respectively, the measurement units measuring items conveyed by the conveyance units; and a control unit for performing filtering processing on an original signal regarding a measurement output from each of the measurement units. The control unit sets a filter condition to apply to the filtering processing for each of the measurement units or on each group when the measurement units are divided in at least two different groups.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a weighing device.

Background Art

[0002] As an example of a weighing device, there is a device that simultaneously weighs the weights of a plurality of articles (objects to be weighed). In Patent Document 1 below, a multi-connected weighing device is disclosed in which a plurality of weighing and conveying units each including a conveying unit for conveying an article, a driving unit for driving the conveying unit, and a weighing unit for weighing an article being conveyed by the conveying unit are arranged in parallel.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the weighing device as described above, the weighing units included in each weighing and conveying unit are arranged at different positions from each other. Therefore, since the effects on vibrations of the weighing device itself, vibrations transmitted from the outside to the weighing device, etc. are different, there is a concern that the weighing accuracy varies for each weighing and conveying unit.

[0005] An object of one aspect of the present invention is to provide a weighing device capable of reducing variations in the weighing accuracy of each weighing unit even when a plurality of weighing units are provided.

Means for Solving the Problems

[0006] A weighing device according to one aspect of the present invention comprises a plurality of transport units arranged in a direction intersecting the transport direction, a plurality of weighing units connected to each of the plurality of transport units for weighing the items transported by the plurality of transport units, and a control unit that performs filtering on the raw weighing signals output from each of the plurality of weighing units, wherein the control unit sets filter conditions to be applied to the filtering process for each of the plurality of weighing units, or for each group when the plurality of weighing units are divided into two or more groups.

[0007] In this weighing device, the control unit sets filter conditions to be applied to the filtering process for each of the multiple weighing units, or for each group if the multiple weighing units are divided into two or more groups. This allows for the setting of appropriate filter conditions for each of the multiple weighing units, or for each group. Therefore, it is possible to reduce variations in the weighing accuracy of each weighing unit, or each group.

[0008] The control unit may set filter conditions including at least one of the multiple digital filters based on the result of applying each of the multiple digital filters to the original signal while the transport unit is operating but no goods are being transported by the transport unit. In this case, filter conditions for each weighing unit or each group can be automatically set while the transport unit is operating but no goods are being transported by the transport unit (so-called idle operation).

[0009] The control unit may register different product settings for each of the multiple weighing units, or for each group. In this case, even if items of different sizes flow through each weighing unit, each item can be weighed at the appropriate time.

[0010] The control unit may aggregate the weighing results of each of the multiple weighing units, or the weighing results of each group. In this case, the weighing accuracy of each weighing unit or each group can be easily confirmed based on the aggregated information. [Effects of the Invention]

[0011] According to one aspect of the present invention, even when the device is equipped with multiple weighing units, it is possible to provide a weighing device that can suppress variations in the weighing accuracy of each weighing unit. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a schematic diagram of the weighing device according to an embodiment. [Figure 2] Figure 2 is a schematic diagram showing one conveying unit and one weighing unit connected to the conveying machine. [Figure 3] Figure 3 shows the functional configuration of the control unit. [Figure 4] Figure 4 is a flowchart illustrating how to select a digital filter. [Modes for carrying out the invention]

[0013] Hereinafter, embodiments relating to one aspect of the present invention will be described in detail with reference to the drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals, and redundant explanations are omitted.

[0014] Figure 1 is a schematic perspective view of a weighing device according to this embodiment. The weighing device 1 shown in Figure 1 is a device that weighs an object to be weighed while transporting it in a predetermined direction (transport direction), and is positioned, for example, at the end of a production line. Multiple types of items to be weighed can be weighed at once in the weighing device 1. The items to be weighed are, for example, goods (articles) weighed by the weighing device 1. In the following description, goods may be simply referred to as "goods" or "articles".

[0015] The weighing device 1 comprises a main body 2 and an operating unit 3. The main body 2 is the part that transports and weighs the goods, and has a stand 4, a conveyor 5, a sensor 6, and a weighing machine 7. The operating unit 3 is the part that operates the main body 2 and is installed near the main body 2. The operating unit 3 has a display interface 8 and a control unit 9.

[0016] The frame 4 is a housing that accommodates or supports the conveyor 5, sensor 6, and weighing machine 7, and is fixed to the floor. The frame 4 has a main section 4a located below the conveyor 5 and housing the weighing machine 7, a cover 4b that covers a part of the conveyor 5 and on which the sensor 6 is mounted, and a plurality of legs 4c attached to the main section 4a.

[0017] The conveyor 5 is a device capable of conveying goods along a predetermined direction at a conveying speed specified, for example, via the operating unit 3. The conveyor 5 has a plurality of conveying units 11 to 16 arranged in a direction intersecting the predetermined direction. In this embodiment, the conveying units 11 to 16 have the same configuration as each other and are arranged at different positions. Each of the conveying units 11 to 16 may be driven independently of each other. The goods conveyed by the conveying units 11 to 16 may be the same as or different from each other. Alternatively, the goods conveyed by some of the conveying units 11 to 16 may be different from the goods conveyed by other parts of the conveying units 11 to 16. The conveying units 11 to 16 may be divided into two or more groups. For example, conveying units 11 to 13 may be included in the first group, and conveying units 14 to 16 may be included in the second group. Each group may convey a single type of goods or multiple types of goods.

[0018] Sensor 6 is a component that detects the presence or absence of goods on the conveyor 5 and is located above the conveyor 5. Sensor 6 detects the presence or absence of goods in each of the conveying sections 11 to 16. The goods detection result from sensor 6 is output to the operation unit 3. Sensor 6 is, for example, an optical sensor.

[0019] The weighing machine 7 is a device that weighs the goods located on the conveyor 5, is positioned below the conveyor 5, and is housed in the main body 4a. The weighing machine 7 has a plurality of weighing units (not shown) connected to each of the conveying units 11 to 16. Thereby, the weighing machine 7 can independently weigh the goods located on each of the conveying units 11 to 16. For example, the weighing machine 7 can weigh the goods located on the conveying unit 11 and another goods located on the conveying unit 13 at one time. The weighing result of the goods is output to the operation unit 3 from each of the plurality of weighing units included in the weighing machine 7, for example. In the present embodiment, each of the plurality of weighing units has the same configuration as each other and is arranged at different positions.

[0020] Here, the configuration of the conveying unit 11 and the weighing unit connected to the conveying unit 11 will be described while referring to FIG. 2. As shown in FIG. 2, the conveying unit 11 includes a first conveyor unit 11a and a second conveyor unit 11b arranged in order along a predetermined direction. Each of the first conveyor unit 11a and the second conveyor unit 11b conveys the goods along a predetermined direction. Therefore, it can be said that the predetermined direction corresponds to the conveying direction of the goods. Each of the first conveyor unit 11a and the second conveyor unit 11b has, for example, a rotating body (driving source) such as a roller and a motor, and a conveying belt. The first conveyor unit 11a is a conveyor that conveys the article P, which is the goods, into the second conveyor unit 11b. A sensor 6 is arranged on the first conveyor unit 11a. Thereby, the sensor 6 can detect the passage of the article P through the first conveyor unit 11a. The second conveyor unit 11b is a conveyor that receives the article P conveyed from the first conveyor unit 11a. The second conveyor unit 11b conveys the weighed article P outside the weighing device 1. A sorting machine (not shown) for sorting the article P determined to have an excessive weight or an insufficient weight may be arranged on the downstream side of the second conveyor unit 11b.

[0021] The weighing unit 20 connected to the conveying unit 11 is attached to the second conveyor unit 11b. For this reason, the article P conveyed by the conveyor 5 is weighed on the second conveyor unit 11b. The weighing unit 20 includes a strain generating body 21 that undergoes compression and tension according to a load, and a weighing cell 22 that weighs the article P located on the second conveyor unit 11b. The strain generating body 21 has a movable rigid body portion 21a that supports the second conveyor unit 11b and a fixed rigid body portion 21b that is fixed to the main portion 4a. Each of the movable rigid body portion 21a and the fixed rigid body portion 21b is, for example, a member extending in the vertical direction. One end of the movable rigid body portion 21a is connected to the upstream end portion of the second conveyor unit 11b, and the other end of the movable rigid body portion 21a is connected to the weighing cell 22. One end of the fixed rigid body portion 21b is connected to the weighing cell 22, and the other end of the fixed rigid body portion 21b is connected to the main portion 4a of the gantry 4. Although not shown, in the weighing cell 22, a plurality of strain gauges attached to the strain generating body 21 are connected to a Wheatstone bridge circuit.

[0022] In the present embodiment, the weighing unit 20 has an A / D conversion unit in addition to the strain generating body 21 and the weighing cell 22. The weighing cell 22 extracts an electrical signal corresponding to the load transmitted from the strain generating body 21 from the Wheatstone bridge circuit. This electrical signal is an analog raw signal indicating the weighing result of the article P by the weighing cell 22 and is obtained when the article P is located on the second conveyor unit 11b. This analog raw signal is converted into a digital raw signal by the A / D conversion unit. The weighing unit 20 uses the digital raw signal as the raw signal (weighing result) and outputs it to the outside. A plurality of weighing units connected to each of the conveying units 12 to 16 also output the raw signal (digital raw signal) generated in the same manner as the weighing unit 20 to the outside. Thereby, the data amount of the raw signal transmitted from the weighing machine 7 to the operation unit 3 can be reduced.

[0023] Returning to Figure 1, the display interface 8 is a component (display unit) that displays an image based on the display information output from the control unit 9. The display interface 8 displays, for example, the weighing signal obtained by filtering the raw signal output from the weighing machine 7, the weighing value obtained based on the weighing signal, the transport conditions of the transporter 5, the product characteristic settings, the weighing pitch of the product, etc. The transport conditions of the transporter 5 are, for example, the transport speed of the transport units 11-16 and the product transport frequency. The transport frequency can be set, for example, based on the capacity of the production machine located upstream of the weighing device 1. The product characteristic settings (product settings) are, for example, the type of product, name, dimensions, ideal weighing value, etc. The weighing pitch of the product is calculated by the control unit 9 based on, for example, the transport speed, product dimensions, transport frequency, etc.

[0024] The display interface 8 has a touch panel 8a that functions as an external input unit. When the display interface 8 receives input from an operator (user), the input information indicating the input content is output to the control unit 9. This input information includes, for example, data related to the transport conditions and product settings of the transport units 11-16. The input information for the transport units 11-16 is registered in association with each weighing unit.

[0025] The operator individually inputs the input information (such as the above-mentioned transport conditions and product settings) for the transport units 11-16 via the display interface 8, but is not limited to this. If the transport units 11-16 are divided into two or more groups, the operator may input the above-mentioned input information for each group. This ensures that the same input information is entered for all transport units and weighing units included in a given group. The control unit 9, described later, registers the input information for each of the transport units 11-16 (and multiple weighing units), or for each group.

[0026] The control unit 9 is a controller that controls each component included in the weighing device 1 and is built into the operation unit 3. The control unit 9 is composed of a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), etc. For example, the control unit 9 outputs an operation signal to the conveyor 5 that controls the operation of the conveyor 5 specified via the display interface 8. Also, for example, if a sorting machine is provided in the second conveyor section 11b and the control unit 9 determines that the weight of the product deviates from a preset appropriate range, the control unit 9 outputs an operation signal to the sorting machine to sort the product (remove it from the line). The control unit 9 is a processing unit that not only controls each component included in the weighing device 1 but also receives / calculates / transmits various signals and records / reads various signals. An example of the calculation of various signals by the control unit 9 is the derivation of the weighing result of the product. Therefore, the control unit 9 includes, for example, a drive circuit for outputting a control signal for the conveyor 5, a drive circuit for calculating the weighing value of the product from the raw signal generated by the weighing machine 7, a drive circuit for calculating the accuracy information from the raw signal, and a storage circuit for storing each signal and each piece of information.

[0027] Figure 3 shows the functional configuration of the control unit. As shown in Figure 3, the control unit 9 includes a receiving unit 31, a filtering unit 32, a calculation unit 33, an output unit 34, and a storage unit 35.

[0028] The receiving unit 31 is, for example, the part that receives the raw signal transmitted from the weighing machine 7 and the input information transmitted from the display interface 8. The transmission of the raw signal from the weighing machine 7 to the receiving unit 31 and the transmission of the input information from the display interface 8 to the receiving unit 31 may be carried out via a wired connection or via a wireless connection. The receiving unit 31 may also receive data other than the raw signal and input information.

[0029] The filter unit 32 is the part that filters the original signal output from the weighing machine 7. The filtering process involves applying at least one of a plurality of digital filters stored in the control unit 9 to the original signal. Each of the plurality of digital filters consists of a low-pass filter that attenuates frequency components exceeding a predetermined frequency, a notch filter (bandstop filter) that attenuates noise at the frequency of the rotating body included in the conveyor 5, and so on. That is, if at least a portion of the plurality of digital filters are selected, the filter unit 32 can perform multi-stage filtering on the original signal. Each digital filter may include one or more low-pass filters and one or more notch filters. Each of the plurality of digital filters may include low-pass filters with different attenuation amounts for different frequency bands, or may include notch filters that attenuate different frequency bands. The plurality of low-pass filters may be variable filters as described in, for example, Japanese Patent No. 5901126.

[0030] The filter unit 32 performs filtering on the raw signals output from each of the multiple weighing units while the conveyor 5 is in operation and while the item P is being conveyed. This generates multiple weighing signals corresponding to each raw signal. The obtained multiple weighing signals are output to, for example, the calculation unit 33, storage unit 35, etc., included in the control unit 9 shown in Figure 1. Each weighing signal has a waveform that is prepared for calculating the weight of the item P. In this embodiment, filter conditions are set for each of the multiple weighing units, or for each group if the multiple weighing units are divided into two or more groups. The filter conditions are a filter set that includes at least one of multiple digital filters. The filter conditions set for each weighing unit or each group may be the same or different from each other.

[0031] The filter unit 32 applies each of the multiple digital filters to the raw signals output from each of the multiple weighing units when the conveyor 5 is in operation but no goods are being conveyed by the conveyor 5 (hereinafter also referred to as "drowsy operation of the conveyor 5"). At this time, the raw signals may be to which not only are the multiple digital filters applied individually, but also to which a combination of two or more digital filters are applied. As a result, the filter unit 32 generates multiple weighing signals, which are the result of applying each of the multiple digital filters to each raw signal obtained during the idle operation of the conveyor 5. In other words, the filter unit 32 generates multiple weighing signals for each weighing unit. The filter unit 32 then outputs the multiple weighing signals to the calculation unit 33, the storage unit 35, etc. Whether or not the conveyor 5 is idle may be determined by an operator or by an automatic determination. For example, the conveyor 5 may be automatically determined to be idle when the conveyor 5 is in operation and the sensor 6 remains in a non-detection state for a predetermined period of time or longer.

[0032] If the transport units 11-16 are divided into two or more groups, the filter unit 32 may sequentially apply each of the multiple digital filters to the raw signal output from one of the weighing units included in each group during idle operation of the transport machine 5. For example, if transport units 11-13 are included in the first group and transport units 14-16 are included in the second group, the filter unit 32 sequentially applies each of the multiple digital filters to the raw signal output from the weighing unit connected to any of the transport units 11-13 (hereinafter sometimes simply referred to as the first main weighing unit) and the raw signal output from the weighing unit connected to any of the transport units 14-16 (hereinafter sometimes simply referred to as the second main weighing unit). As a result, the filter unit 32 generates multiple weighing signals for each group and outputs these multiple weighing signals to the calculation unit 33, the storage unit 35, etc. In this case, the number of weighing signals can be reduced.

[0033] The calculation unit 33 is the part that processes the various input information. While the conveyor 5 is operating and the item P is being conveyed, the calculation unit 33 calculates the weight of the item based on the weighing signal output from the filter unit 32. As a result, the calculation unit 33 generates the weighed value of the item. The calculation unit 33 outputs the weighed value generated for each weighing unit or for each group to the output unit 34. The calculation unit 33 calculates the weighing pitch (weighing interval) of the item based on the conveying speed of the conveyor 5, the dimensions of the item P, and the conveying frequency. Based on the above weighed value, the calculation unit 33 determines whether the weight of the item deviates from a preset appropriate range. Depending on this determination result, the calculation unit 33 outputs an operation signal to, for example, a sorting machine.

[0034] The calculation unit 33 sets filter conditions to be applied to the filtering process for each of the multiple weighing units. In this embodiment, the calculation unit 33 sets filter conditions including at least one of the multiple digital filters based on the result of applying each of the multiple digital filters to the raw signal obtained during the idle operation of the conveyor 5. The calculation unit 33 compares multiple weighing signals with respect to the raw signal output from the weighing unit connected to the conveyor unit 11. This determines the most appropriate weighing signal for that weighing unit. Subsequently, the calculation unit 33 sets one digital filter or a combination of two or more digital filters to be applied to the determined weighing signal as filter conditions. The calculation unit 33 then outputs the determined weighing signal and information regarding the set filter conditions to the storage unit 35. This sets the filter conditions to be applied to the conveyor unit 11 and the weighing units connected thereto. Filter conditions are also set for the conveyor units 12 to 16 in the same manner as for the conveyor unit 11.

[0035] If the transport units 11-16 are divided into two or more groups, the calculation unit 33 may set filter conditions to be applied to the filtering process for each group. If the transport units 11-13 are in the first group and the transport units 14-16 are in the second group, the calculation unit 33 compares multiple weighing signals output from the first main weighing unit of the first group. This determines the most appropriate weighing signal in the first group. Subsequently, the calculation unit 33 sets one digital filter or a combination of two or more digital filters to be applied to the determined weighing signal as filter conditions. Filter conditions are set for the second group in the same manner as for the first group.

[0036] Each of the transport units 11 to 13 is assigned the filter conditions defined in the first group. Similarly, each of the transport units 14 to 16 is assigned the filter conditions defined in the second group. This allows the filter conditions to be set in a shorter time compared to setting the filter conditions for each of the transport units 11 to 16 individually. When filter conditions are already set for each of the transport units 11 to 16, if new filter conditions are set for each group, the filter conditions set for transport units 11 to 16 will be overwritten by the filter conditions set for each group.

[0037] Comparing weighing signals is equivalent to comparing parameters obtained based on the standard deviation of the amplitude of the waveforms contained in the weighing signals. These parameters may be the standard deviation of the amplitude itself, the standard deviation of the derivative of the amplitude, or the standard deviation of the second derivative of the amplitude. In these cases, the calculation unit 33 determines that the weighing signal that yields the smallest standard deviation is the most appropriate weighing signal for a given weighing unit or group. The waveform contained in the weighing signal includes vibrations generated by the weighing device 1 and its surroundings. These vibrations become noise in the weighing of the product. Therefore, the smaller the standard deviation of the amplitude of the waveform, the less noise is considered to be in the weighing of the product.

[0038] The output unit 34 outputs, for example, various information and signals generated by the control unit 9 and various information and signals stored in the storage unit 35 to the outside. The output unit 34 outputs, for example, the weighed value (weighing result) of the product in each weighing unit or each group, the filter conditions of each weighing unit, the weighing pitch, etc., as display information to the display interface 8. The output unit 34 outputs an operation signal to the conveyor 5 to control the conveying speed of the conveyor 5, and outputs an operation signal to the sorting machine. The output of operation signals from the output unit 34 to the conveyor 5 may be carried out via wired or wireless connection. In order to display the weighed value of the product in each weighing unit or each group on the display interface 8, the output unit 34 aggregates the weighed values ​​of each weighing unit or each group.

[0039] The memory unit 35 stores input information received via the display interface 8, as well as various information and signals generated by the control unit 9. The memory unit 35 stores pre-set filter conditions for each weighing unit or group. The memory unit 35 stores the date and time when the filter conditions were set. In addition, the memory unit 35 stores the filter conditions set at that date and time in association with the original signal itself, the weighing signal based on the original signal, and the weighed value. This allows the operator to easily check the weighing status of the weighing device 1 when the filter conditions are selected.

[0040] Next, the method for automatically selecting a digital filter using the weighing device 1 according to this embodiment will be explained with reference to Figure 4. Figure 4 is a flowchart illustrating the method for selecting a digital filter.

[0041] First, the weighing conditions for the weighing device 1 are set (step S1). In step S1, the transport conditions for the conveyor 5, product settings, product transport frequency, etc., are set via the display interface 8. At least some of the weighing conditions may be automatically set or adjusted by the weighing device 1. For example, the transport speed of the transport units 11-16 may be automatically set or adjusted when the operator selects the type of product via the display interface 8. The set weighing conditions are displayed on the display interface 8. This makes it easy for the operator to confirm whether the weighing conditions set are correct.

[0042] Next, the raw signals are acquired when the conveyor 5 is operated without any goods being transported (i.e., when the conveyor 5 is run empty) (step S2). In step S2, for example, the weighing machine 7 acquires the raw signals of each conveyor unit 11-16 when it is run empty for about 5 seconds at a specified conveying speed before weighing the goods. Each raw signal is output to the control unit 9. When the conveyor units 11-16 are divided into two or more groups, the raw signals output from the main weighing unit in each group are output to the control unit 9.

[0043] Next, each of the multiple digital filters is applied to each acquired raw signal (step S3). In step S3, the filter unit 32 applies each of the multiple digital filters to each of the raw signals to perform filtering. As a result, the filter unit 32 generates multiple metering signals for each metering unit or for each group.

[0044] Next, the weighing signals for each weighing unit or group are compared (step S4). In step S4, for example, the standard deviation of the amplitude of the waveforms contained in each of the multiple weighing signals is calculated for each weighing unit or group. Subsequently, the calculation unit 33 compares the magnitude of each standard deviation. Here, the calculation unit 33 determines the weighing signal whose waveform yields the smallest standard deviation for each weighing unit or group.

[0045] Next, filter conditions are set for each weighing unit or group (step S5). In step S5, the calculation unit 33 selects the digital filter used to generate the weighing signal determined in step S4. The digital filter selected for each weighing unit or group is used as the filter condition. As a result, the filter conditions to be used when weighing the products are automatically set and reserved before the weighing of the products is performed.

[0046] The effects and advantages of the weighing device 1 according to this embodiment, as described above, will now be explained using the comparative example described below. The weighing device according to the comparative example comprises a conveyor having a plurality of conveying units, similar to weighing device 1, and a weighing machine having a plurality of weighing units connected to each of the plurality of conveying units. In the comparative example, the same filter conditions are automatically set for each weighing unit. Here, the positions of each weighing unit in the weighing device are naturally different from each other. For this reason, for example, the distance between each weighing unit and a vibration source within the weighing device (e.g., a motor included in the conveying unit) is different from each other. In addition, the distance between each weighing unit and a vibration source outside the weighing device (e.g., a production machine located upstream of the weighing device) is also different from each other. Therefore, the degree of influence of the vibration sources as described above differs depending on the weighing unit. Consequently, the filter conditions set in the comparative example may be appropriate for some weighing units, but not for others (i.e., there may be more appropriate filter conditions). In this case, the weighing accuracy of each weighing unit will vary.

[0047] In contrast, in the weighing device 1 according to this embodiment, the control unit 9 automatically sets the filter conditions to be applied to the filtering process for each of the multiple weighing units, or for each group if the multiple weighing units are divided into two or more groups. This makes it possible to set appropriate filter conditions for each of the multiple weighing units, or for each group. Therefore, it is possible to reduce the variation in weighing accuracy of each weighing unit, or each group.

[0048] In this embodiment, the calculation unit 33 of the control unit 9 sets filter conditions including at least one of the multiple digital filters based on the result of applying each of the multiple digital filters to the original signal while the transport units 11 to 16 are operating and no goods are being transported by the transport units 11 to 16. Therefore, filter conditions for each weighing unit or each group can be automatically set during idle operation of the transport units 11 to 16.

[0049] In this embodiment, the control unit 9 may register different product settings for each of the multiple weighing units, or for each group. In this case, even when products of different sizes flow through each weighing unit, each product can be weighed at the appropriate timing.

[0050] In this embodiment, the control unit 9 may aggregate the weighing results of each of the multiple weighing units, or the weighing results of each group. In this case, the weighing accuracy of each weighing unit or each group can be easily confirmed based on the aggregated information.

[0051] Although embodiments of a weighing device according to one aspect of the present invention have been described above, the present invention is not limited to the above embodiments.

[0052] In the above embodiment, filter conditions are set for each weighing unit or each group at once, but this is not limited to this. For example, filter conditions may be set for only a specific weighing unit among multiple weighing units. Also, if multiple transport units are divided into two or more groups, filter conditions may be set for only a specific group. In this case, filter conditions may be set for all weighing units included in the specific group at once, or filter conditions may be set for each of the weighing units. In these cases, transport units connected to weighing units for which no filter conditions are set will also run empty.

[0053] In the above embodiment, the weighing unit outputs the digital source signal as the source signal to the outside, but it is not limited to this. The weighing unit may also output the acquired analog source signal as the source signal to the outside. In this case, for example, the control unit may convert the analog source signal to digital. [Explanation of symbols]

[0054] 1...Weighing device, 2...Main unit, 3...Operation unit, 4...Stand, 5...Conveyor, 6...Sensor, 7...Weighing machine, 8...Display interface, 8a...Touch panel, 9...Control unit, 11~16...Conveyor unit, 20...Weighing unit, 21...Strain generating body, 21a...Movable rigid body unit, 21b...Fixed rigid body unit, 22...Weighing cell, 31...Receiver unit, 32...Filter unit, 33...Calculation unit, 34...Output unit, 35...Storage unit.

Claims

1. Multiple conveying units arranged in a direction intersecting the conveying direction, A plurality of weighing units are connected to each of the plurality of transport units and weigh the articles transported by the plurality of transport units, The system includes a control unit that performs filtering on the raw signal related to weighing output from each of the plurality of weighing units, The control unit sets filter conditions to be applied to the filtering process for each of the plurality of weighing units, or for each group if the plurality of weighing units are divided into two or more groups. The control unit registers different product settings for each of the plurality of weighing units, or for each of the groups. Weighing device.

2. The weighing apparatus according to claim 1, wherein the control unit sets the filter conditions, which include at least one of the plurality of digital filters, based on the result of applying each of the plurality of digital filters to the original signal while the transport unit is in operation and the article is not being transported by the transport unit.

3. The weighing apparatus according to claim 1 or 2, wherein the control unit aggregates the weighing results of each of the plurality of weighing units, or the weighing results of each group.

Images