Weighing device

Abstract

To provide a weighing device that obtains an optimum active correction value.SOLUTION: A weighing device 1 comprises a transport unit 2, a weighing unit 4, and a control unit 8. The transport unit 2 transports an article. The weighing unit 4 measures the weight of the article on the transport unit 2. The control unit 8 processes the weighing signal outputted from the weighing unit 4. The control unit 8 acquires a first reference weight value obtained by statically weighing a sample P1 which is at least a first reference article and a second reference weight value obtained by statically weighing a sample P2 which is a second reference article. The control unit 8 further calculates a correction value used in weighing signal processing on the basis of the acquired first and second reference weight values and the weighing results of the first and second reference articles having been weighed while being transported by the transport unit 2.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] An example of a weighing device is a device that weighs an object (object to be weighed) transported by a transport conveyor. For example, in the weighing device described in Patent Document 1 (JP 2022-64521 A), a difference occurs between a static weighing value obtained by weighing a sample in a weighing unit when the transport conveyor is stopped and a dynamic weighing value obtained by weighing the sample in the weighing unit while the sample is being transported by the transport conveyor, so dynamic correction processing is performed on the dynamic weighing value.

[0003] Dynamic correction is performed by inputting the reference value of one representative sample and calculating the dynamic correction value from the measurement results. Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the dynamic correction value is not optimal, a non-defective product may be judged as a reject, or vice versa. An object of the present invention is to provide a weighing device that determines an optimal dynamic correction value. [Means for solving the problem]

[0005] A weighing device according to a first aspect includes a conveying unit, a weighing unit, and a processing unit. The conveying unit conveys an item. The weighing unit weighs the item on the conveying unit. The processing unit processes a weighing signal output from the weighing unit. The processing unit acquires a first reference weight value obtained by statically weighing a first reference item and a second reference weight value obtained by statically weighing a second reference item. The processing unit further calculates a correction value to be used in processing the weighing signal based on the acquired first and second reference weight values ​​and the weighing results obtained by weighing the first and second reference items while they are conveyed by the conveying unit.

[0006] In this weighing device, a more appropriate correction value can be obtained by calculating the correction value based on a plurality of reference articles.

[0007] A weighing device according to a second aspect is the weighing device according to the first aspect, wherein the first reference weight value and the second reference weight value are different from each other.

[0008] A weighing device according to a third aspect is the weighing device according to the first or second aspect, wherein the first reference weight value and the second reference weight value are obtained by the weighing unit while the transport unit is stopped.

[0009] This weighing device eliminates the need to obtain the first reference weight value and the second reference weight value using separate scales.

[0010] A weighing device of a fourth aspect is a weighing device of the first or second aspect, wherein when the processing unit acquires the first reference weight value and the second reference weight value, the processing unit acquires the weighing values ​​over a longer time than the time required to weigh the items being transported by the transport unit.

[0011] In this weighing device, a more accurate reference weight can be obtained by allowing a longer time for weighing the items. [Effects of the Invention]

[0012] In the weighing device according to the present invention, a more appropriate correction value can be obtained by calculating the correction value based on a plurality of reference articles. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a front view schematically showing a weighing device according to an embodiment of the present invention; [Figure 2] FIG. 2 is a block diagram of a control unit. [Figure 3] 10 is a flowchart of dynamic correction setting. [Figure 4A] FIG. 10 is a front view of a system configuration setting screen displayed on a touch panel. [Figure 4B]FIG. 10 is a front view of a sampling number input screen displayed on a touch panel. [Figure 4C] FIG. 10 is a front view of a zero point adjustment screen displayed on a touch panel. [Figure 4D] FIG. 10 is a front view of a stationary measured value setting screen displayed on a touch panel. [Figure 4E] FIG. 10 is a front view of a still weight input screen displayed on a touch panel. [Figure 4F] FIG. 10 is a front view of a dynamic correction execution screen displayed on a touch panel. [Figure 4G] FIG. 10 is a front view of an execution screen during dynamic correction displayed on a touch panel when samples P1 to P3 are conveyed once in order on the second conveyor. [Figure 4H] FIG. 10 is a front view of the screen displayed on the touch panel when dynamic correction is completed. [Figure 5] FIG. 2 is a front view of the weighing device, schematically illustrating a state in which samples P1, P2, and P3 serving as reference articles flow in order on a conveying section. DETAILED DESCRIPTION OF THE INVENTION

[0014] (1) Configuration of the measuring device 1 Fig. 1 is a front view showing a schematic diagram of a weighing device 1 according to this embodiment. In Fig. 1, the weighing device 1 is a device that weighs an object P, which is an object to be measured, while conveying it in a conveying direction (the direction of the arrow in Fig. 1). The weighing device 1 is a device that is placed, for example, at the end of a production line, and includes a conveying unit 2, a stand 3, a weighing unit 4, and an operation unit 6.

[0015] (1-1) Conveyor 2 In this embodiment, the transport unit 2 is a conveyor. The transport unit 2 transports the item P at a transport speed specified via the operation unit 6. The transport speed is specified via the operation unit 6. The transport unit 2 includes a first conveyor unit 2a, a second conveyor unit 2b, and a third conveyor unit 2c.

[0016] Each of the first conveyor section 2a, the second conveyor section 2b, and the third conveyor section 2c includes a roller, a rotating body such as a motor, a conveyor belt, and the like.

[0017] The second conveyor section 2b is located between the first conveyor section 2a and the third conveyor section 2c in the conveying direction. The first conveyor section 2a carries the item P into the second conveyor section 2b. The second conveyor section 2b carries the item P carried from the first conveyor section 2a into the third conveyor section 2c. The third conveyor section 2c carries the item P out of the second conveyor section 2b.

[0018] The second conveyor section 2b is equipped with a weighing section 4. Therefore, the articles P conveyed by the conveying section 2 are weighed on the second conveyor section 2b.

[0019] (1-2) Stand 3 The base 3 is a member that houses the weighing unit 4, and is fixed to the floor F below the transport unit 2. The base 3 has a main body 3a that houses the weighing unit 4, and multiple legs 3b that are positioned between the main body 3a and the floor F. In FIG. 1, the main body 3a is indicated by a dashed line.

[0020] (1-3)Measuring part 4 The weighing unit 4 is located in the center of the transport unit 2 and weighs the weight of the article P located on the second conveyor unit 2b. The weighing unit 4 includes a strain element 11 that is subjected to compression and tension according to the load, and a weighing cell 12 that weighs the article P located on the second conveyor unit 2b.

[0021] The strain generator 11 has a movable rigid part 11a that supports the second conveyor part 2b, and a fixed rigid part 11b that is fixed to the frame 3. The movable rigid part 11a and the fixed rigid part 11b are each a member that extends in the vertical direction. One end of the movable rigid part 11a is connected to the upstream end of the second conveyor part 2b, and the other end of the movable rigid part 11a is connected to the weighing cell 12. One end of the fixed rigid part 11b is connected to the weighing cell 12, and the other end of the fixed rigid part 11b is connected to the main body 3a of the frame 3.

[0022] In this embodiment, the weighing unit 4 has an A / D conversion unit in addition to the strain body 11 and the weighing cell 12. The weighing cell 12 extracts an electrical signal corresponding to the load transmitted from the strain body 11. This electrical signal is an analog raw signal indicating the result of weighing the item P by the weighing cell 12, and is obtained when the item P is positioned on the second conveyor unit 2b. This analog raw signal is converted into a digital raw signal by the A / D conversion unit. The weighing unit 4 outputs this digital raw signal as an original signal to the outside. This makes it possible to reduce the amount of data of the original signal sent from the weighing unit 4 to the operation unit 6.

[0023] (1-4)Operation unit 6 The operation unit 6 is a device for operating the transport unit 2 and the weighing unit 4, and is disposed, for example, near the second conveyor unit 2b. The operation unit 6 has a display interface 7 and a control unit 8.

[0024] The display interface 7 displays an image based on the display information output from the control unit 8. The display interface 7 displays, for example, a weighing signal obtained by filtering the original signal, a weighing value indicating the weighing result of the weight of the item P, accuracy information for evaluating the accuracy of the weighing value, the conveying speed of the conveying unit 2, the dimensions of the item P along the conveying direction, the conveying frequency of the item P, the weighing pitch of the item P, etc.

[0025] In this embodiment, the display interface 7 has a touch panel 7a that functions as an external input unit. When the display interface 7 receives an input from an operator, input information indicating the input content is output to the control unit 8.

[0026] The input information is, for example, data regarding the conveying speed of the conveying section 2, the dimensions of the item P along the conveying direction, the type of item P, the conveying frequency of the item P, etc. The conveying frequency of the item P is set based on, for example, the capacity of a production machine located upstream of the weighing device 1.

[0027] The weighing value and accuracy information of the item P are data obtained based on the weighing signal sent from the weighing unit 4 to the operation unit 6. The weighing value is calculated using a known method. The weighing pitch of the item P is calculated by the control unit 8 based on the conveying speed of the conveying unit 2, the dimensions of the item P, and the conveying frequency of the item P. The conveying frequency of the item P is set based on the capacity of the production machine located upstream of the weighing device 1.

[0028] (1-5) Control Unit 8 The control unit 8 controls each component included in the weighing device 1. The control unit 8 is built into the operation unit 6. The control unit 8 is composed of a CPU, RAM, ROM, etc. The control unit 8 outputs an operation signal to the conveying unit 2 to control the conveying speed of the conveying unit 2, which is specified via the display interface 7, for example.

[0029] Also, for example, if a sorting machine (not shown) is provided on the third conveyor section 2c and the control unit 8 determines that the weight of the item P deviates from a predetermined appropriate range, the control unit 8 removes the item P from the line via the sorting machine.

[0030] The control unit 8 is a processing unit that not only controls each component included in the weighing device 1, but also receives, calculates, and transmits various signals, and records and reads out various signals. An example of the calculation of various signals by the control unit 8 is the derivation of the weighing result of the item P.

[0031] 2 is a block diagram of the control unit 8. In FIG. 2, the control unit 8 has a receiving unit 21, a filter unit 22, a calculation unit 23, an output unit 24, and a storage unit 25.

[0032] (1-5-1) Receiving unit 21 The receiving unit 21 is a unit that receives, for example, the original signal transmitted from the weighing unit 4 and the input information transmitted from the display interface 7. The transmission of the original signal from the weighing unit 4 to the receiving unit 21 and the transmission of the input information from the display interface 7 to the receiving unit 21 may be performed via a wired connection or wirelessly. The receiving unit 21 may receive data other than the original signal and the input information.

[0033] (1-5-2) Filter section 22 The filter unit 22 is a part that performs filtering processing on the original signal output from the measuring unit 4 using a plurality of preset digital filters.

[0034] The filter unit 22 filters the original signal while the conveying unit 2 is operating and while the item P is being conveyed. The filter unit 22 outputs a weighing signal obtained by filtering the original signal. The obtained weighing signal is output to, for example, the calculation unit 23 and memory unit 25 included in the control unit 8. The weighing signal has a waveform that is adjusted to calculate the weight of the item P.

[0035] The filter unit 22 also performs filtering processing on raw signals obtained when the conveying unit 2 is operating but no articles P are being conveyed by the conveying unit 2 (hereinafter also referred to as "during idle operation of the conveying unit 2"). As a result, the filter unit 22 generates a weighing signal even for raw signals obtained during idle operation of the conveying unit 2.

[0036] (1-5-3) Arithmetic unit 23 The calculation unit 23 performs calculations on the various pieces of input information. While the conveying unit 2 is operating and the item P is being conveyed, the calculation unit 23 calculates the weight of the item P based on the weighing signal output from the filter unit 22. As a result, the calculation unit 23 generates a weighing value of the item P.

[0037] The calculation unit 23 outputs the generated weighing value to the output unit 24. The calculation unit 23 calculates the weighing pitch (weighing interval) of the item P based on the input conveying speed of the conveying unit 2, the dimensions of the item P, and the conveying frequency. Based on the weighing value, the calculation unit 23 determines whether the weight of the item P deviates from a predetermined appropriate range.

[0038] (1-5-4) Output section 24 The output unit 24 outputs to the outside various information and signals generated by the control unit 8 and various information and signals stored in the memory unit 25. The output unit 24 outputs the measurement value, accuracy information, measurement pitch, etc. of the item P to the display interface 7 as display information.

[0039] The output unit 24 outputs an operation signal to the conveying unit 2 to control the conveying speed of the conveying unit 2. The output of the operation signal from the output unit 24 to the conveying unit 2 may be performed via a wired connection or wirelessly.

[0040] (1-5-5) Storage section 25 The storage unit 25 stores input information input via the display interface 7, and various information and signals generated by the control unit 8.

[0041] (2) Dynamic correction processing of weighing device 1 In the weighing device 1, a difference occurs between the static weight value obtained by weighing an item with the weighing unit 4 when the second conveyor unit 2b is stopped and the dynamic weight value obtained by weighing an item with the weighing unit 4 while the item is being transported by the second conveyor unit 2b. Therefore, a dynamic correction process for the dynamic weight value is required.

[0042] In the dynamic correction process, a dynamic correction value calculated from the static weight value and dynamic weight value of a reference article is used, and therefore the dynamic correction value must be appropriate.

[0043] Therefore, in the weighing device according to this embodiment, when calculating the dynamic correction value, the difference between the reference weight value and the dynamic weight value of each of a plurality of reference articles is found, and the dynamic correction value that minimizes this difference is calculated.

[0044] 3 is a flowchart of the dynamic correction setting, which will be described below with reference to FIG.

[0045] (Step S1) In step S1, the control unit 8 determines whether or not a command for dynamic correction setting has been issued. The command for dynamic correction setting can be input by the operator of the weighing device 1 via the touch panel 7a.

[0046] 4A is a front view of the system configuration setting screen 71 of the weighing device 1 displayed on the touch panel 7a. In FIG. 4A, when the operator selects the "Dynamic Correction Setting" item 711 in the middle of the list on the displayed system configuration setting section 71a, the control unit 8 determines that "a command for dynamic correction setting has been issued" and proceeds to step S2.

[0047] (Step S2) Next, in step S2, the control unit 8 requests the number of samples to be taken for one reference article (hereinafter referred to as "samples") The number of samples is input by the operator via the touch panel 7a.

[0048] 4B is a front view of the sampling number input screen 72 displayed on the touch panel 7a. The sampling number input screen 72 is displayed after the "motion correction setting" item 711 is selected from the system configuration setting screen 71 of FIG. 4A. In FIG. 4B, the operator turns on the "motion correction on / off" key 721 of the motion correction setting section 72a and inputs the number of samples in the upper limit sampling number input field 722. In this example, the number of samples is set to 15. When the number of samples has been input, the control unit 8 proceeds to step S3.

[0049] (Step S3) Next, in step S3, the control unit 8 determines whether or not the number of samples for one sample has been input. If the number of samples has been input, the control unit 8 proceeds to step S4.

[0050] (Step S4) Next, in step S4, the control unit 8 requests the execution of zero point adjustment, which is performed by the operator via the touch panel 7a.

[0051] Fig. 4C is a front view of the zero point adjustment screen 73 displayed on the touch panel 7a. In Fig. 4C, the operator confirms that there is nothing on the second conveyor unit 2b and then presses the "zero point" key 731 to perform the zero point adjustment.

[0052] In this embodiment, when the screen switches to the zero point adjustment screen 73, the original automatic zero point function is automatically disabled, and the filter unit 22 switches to the filter with the longest filter time.

[0053] However, production cannot be performed while the screen has switched to the zero point adjustment screen 73. When the zero point adjustment screen 73 is exited, the original automatic zero point function becomes effective, and the filter unit 22 switches to the filter that was set during the filter time before the screen switched to the zero point adjustment screen 73.

[0054] The provision of the zero point adjustment screen 73 makes it easy to check the accuracy of the zero point adjustment, and when the zero point adjustment screen 73 is exited, the filter automatically returns to the setting before switching to the zero point adjustment screen 73, eliminating the risk of starting production without returning the setting.

[0055] (Step S5) Next, in step S5, the control unit 8 determines whether or not zero point adjustment has been performed. When the "zero point" key 731 is pressed, the control unit 8 determines that zero point adjustment has been performed, and proceeds to step S6.

[0056] (Step S6) Next, in step S6, the control unit 8 requests the input of the number of samples and the reference weight value obtained by statically weighing each sample (hereinafter referred to as the "static weighing value"). The input of the number of samples and the static weighing value of each sample is performed by the operator via the touch panel 7a.

[0057] 4D is a front view of the stationary weight setting screen 74 displayed on the touch panel 7a. Here, a case where stationary weight values ​​for three samples are input will be described.

[0058] In FIG. 4D, when the operator inputs 3 into the sample number input field 740 on the still weight setting screen 74, still weight input fields 741, 742, and 743 for samples P1 to P3 are displayed.

[0059] When the operator presses the stillness measurement value input field 741 for sample P1 in FIG. 4D, the screen switches to the stillness measurement value input screen.

[0060] Fig. 4E is a front view of the static weight input screen 75 displayed on the touch panel 7a. In Fig. 4E, when the operator places sample P1 on the second conveyor section 2b, the weight value of sample P1 is displayed in the weight value display field 751. In this state, when the operator presses the "Apply" key 753 in the center of the bottom of the screen, the weight result is input. The static weight values ​​of samples P2 and P3 are input in the same manner.

[0061] The static metric values ​​of samples P1, P2, and P3 may be different from each other as long as they are within an acceptable range.

[0062] Alternatively, samples P1 to P3 may be weighed on a separate scale and the values ​​may be input using the "number" keys 752. This method has the advantage of allowing accurate weighing, but requires the effort of preparing a separate scale.

[0063] In contrast, in this embodiment, the filter time when measuring the static weight value of the reference item is set longer than the filter time when measuring the dynamic weight value, making it possible to obtain an accurate reference weight value.

[0064] Therefore, static weighing on the stopped second conveyor section 2b is less time-consuming and can shorten the adjustment time before production.

[0065] (Step S7) Next, in step S7, the control unit 8 determines whether or not the number of samples and the static weight value of each sample have been input.

[0066] When the number of samples and the static weight value of each sample are input, the control unit 8 proceeds to step S8.

[0067] (Step S8) Next, the control unit 8 performs dynamic correction in step S8. Fig. 4F is a front view of a dynamic correction execution screen 76 displayed on the touch panel 7a.

[0068] In Figure 4F, the dynamic weighing value is displayed in display field 761. To the right of display field 761, "45 times" is displayed. This means that since 15 samples were entered in step S2 and 3 samples were entered in step S6, the total number of measurements is 3 x 15 = 45. Following the message in message field 76a, pressing the "Start" key K1 at the bottom right of the screen will execute dynamic correction.

[0069] FIG. 4G shows an execution screen 76 during dynamic correction displayed on the touch panel 7a when the samples P1 to P3 have been conveyed once in order on the second conveyor unit 2b.

[0070] In FIG. 4G, when dynamic correction is started, a message "Please run sample P1" is displayed in the message field 76a of the screen 76, and the operator runs sample P1 according to the display.

[0071] When sample P1 is properly weighed, the message "Please run sample P2" is displayed, and the operator runs sample P2 according to the display.

[0072] When sample P2 is properly weighed, the message "Please run sample P3" is displayed, and the operator runs sample P3 according to the display.

[0073] As an example, Figure 5 is a front view of the weighing device 1, which schematically shows the state in which sample P1, sample P2, and sample P3, which serve as reference articles, flow in order on the conveying section 2. In Figure 5, the dynamic weighing value of sample P2 flowing on the second conveyor section 2b is affected by fluctuations in the airflow (indicated by the arrow indicated by the dashed line) as it is downwind of sample P3 on the preceding third conveyor section 2c, and this also appears as an error.

[0074] Each time a sample is run, if the measured value is within the allowable range, the word "correct amount" appears in the display field 761. If it is desired to stop the dynamic correction midway, the "stop" key K2 is pressed.

[0075] The display of [1-1 +0.1g] in the error display field 76b of the screen 76 in FIG. 4G means that the error between the first dynamic weighing value and the static weighing value of the sample P1 was +0.1g.

[0076] Similarly, the display [1-2 +0.1g] means that the error between the first dynamic weighing value and the static weighing value of sample P2 was +0.1g.

[0077] Similarly, the display [1-3 +0.1g] indicates that the error between the first dynamic weighing value and the static weighing value of sample P3 was +0.1g.

[0078] The operator performs this series of operations 15 times. For each sampling, the control unit 8 calculates and displays the error between the static weight value of each of the samples P1 to P3 and the dynamic weight value corresponding to each static weight value.

[0079] (Step S9) Next, in step S9, the control unit 8 determines whether or not the dynamic correction is complete. If the dynamic correction is complete, the control unit 8 proceeds to step S10.

[0080] (Step S10) In step S10, the control unit 8 displays on the touch panel 7a that the dynamic correction has been completed, and asks for confirmation. Fig. 4H is a front view of a screen 76 displayed on the touch panel 7a when the dynamic correction has been completed.

[0081] In FIG. 4H, the display [15-1 +0.1g] in the error display field 76b on the screen 76 indicates that the error between the 15th dynamic weighing value and static weighing value of sample P1 was +0.1g.

[0082] Similarly, the display [15-2 +0.1g] means that the error between the 15th dynamic weighing value and the static weighing value of sample P2 was +0.1g.

[0083] Similarly, the display [15-3 +0.1g] indicates that the error between the 15th dynamic weighing value and the static weighing value of sample P3 was +0.1g. Since there were 15 samplings for each sample, all weighings have been completed.

[0084] The control unit 8 calculates a dynamic correction value based on the 45 pieces of error data and stores it in the memory unit 25. When the operator presses the "Confirm" key 762 at the bottom right of the screen, the result of this dynamic correction is applied from the next operation.

[0085] As described above, in this embodiment, a more appropriate correction value is obtained by calculating the correction value based on a plurality of reference samples.

[0086] The technical significance of this is that, as shown in Figure 5, the dynamic weighing value of sample P2 flowing on the second conveyor section 2b is taken into account as it is downwind of sample P3 on the preceding third conveyor section 2c and is therefore affected by fluctuations in airflow.

[0087] (3) Features (3-1) The weighing device 1 comprises a conveying unit 2, a weighing unit 4, and a control unit 8. The conveying unit 2 conveys the objects. The weighing unit 4 weighs the weight of the objects on the conveying unit 2. The control unit 8 processes the weighing signal output from the weighing unit 4. The control unit 8 acquires at least a first reference weight value obtained by statically weighing a sample P1, which is a first reference object, and a second reference weight value obtained by statically weighing a sample P2, which is a second reference object. Furthermore, the control unit 8 calculates a correction value to be used in processing the weighing signal based on the acquired first and second reference weight values ​​and the weighing results of the first and second reference objects being weighed while being conveyed by the conveying unit 2. In the weighing device 1, a more appropriate correction value can be obtained by calculating the correction value based on multiple reference objects.

[0088] (3-2) In the weighing device 1, the first reference weight value and the second reference weight value may be different from each other.

[0089] (3-3) In the weighing device 1, the first reference weight value and the second reference weight value are obtained by the weighing unit 4 while the conveying unit 2 is stopped. The weighing device 1 eliminates the need to obtain the first reference weight value and the second reference weight value using a separate scale.

[0090] (3-4) In the weighing device 1, when the control unit 8 acquires the first reference weight value and the second reference weight value, it takes a longer time to acquire the weighing values ​​than the time required to weigh the items being transported by the transport unit 2. By taking a longer time than the time required to weigh the items, the weighing device 1 can acquire the reference weight more accurately. [Explanation of symbols]

[0091] 1 Weighing device 2. Conveyor section 2a First conveyor section (transport section) 2b Second conveyor section (transport section) 2c Third conveyor section (transport section) 4 Measuring part 8 Control section (processing section) [Prior art documents] [Patent documents]

[0092] [Patent Document 1] Japanese Patent Publication No. 2022-64521

Claims

1. a conveying unit that conveys the article; a weighing unit that weighs the items on the conveying unit; a processing unit that processes a weighing signal output from the weighing unit; Equipped with the processing unit acquires a first reference weight value obtained by statically weighing a first reference object and a second reference weight value obtained by statically weighing a second reference object, and calculates a correction value to be used in processing the weighing signal based on the acquired first reference weight value and second reference weight value and the weighing results obtained by weighing the first reference object and the second reference object while they are being transported by the transport unit. Weighing device.

2. The first reference weight value and the second reference weight value are different from each other. The weighing device according to claim 1 .

3. the first reference weight value and the second reference weight value are acquired by the weighing unit while the conveying unit is stopped. The weighing device according to claim 1 or 2.

4. When acquiring the first reference weight value and the second reference weight value, the processing unit acquires the weight values ​​over a period of time longer than a period of time required to weigh the items being transported by the transport unit. The weighing device according to claim 1 or 2.

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