JP2002005734A - Weight error measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weight error measuring device with simple and inexpensive structure capable of significantly reducing the load of a worker and measuring the error of a weight even if it has any shape. SOLUTION: This weight error measuring device 100 comprises two equivalent weighing trays C and D for putting a weight to be calibrated A or a reference weight B, a replacing means 10 for alternately replacing both the weighing trays with the weights put thereon on a measuring means 2, memory means 14, 16, 18 and 20 for storing the measurement values of the weighing trays put on the measuring means, arithmetic means 22, 24 and 26 for calculating the error of the weight to be calibrated from the measurement values stored in the memory means, and a display means 28 for displaying the error.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weight error measuring device for measuring an error of a weight used for a balance.

[0002]

2. Description of the Related Art Conventional error measurement of a weight uses a weighing means having one weighing pan, and manually and alternately puts a weight to be calibrated and a standard weight on the weighing pan, and writes the weighed value each time. Then, the difference between the weighed value of the weight to be calibrated and the standard weight is calculated to determine the error of the weight to be calibrated. However, this method has a problem that the burden on the worker is large and the working efficiency is not good.

Therefore, in order to reduce the burden on the operator, the weight is automatically replaced by an automatic error measuring device without manual operation, and the weight of the calibration weight is determined based on the difference between the measured values of the calibration weight and the standard weight. It was also performed to find the error.

[0004]

However, the automatic error measuring device requires a complicated and expensive device for automatically reloading the weight on the weighing pan, and also facilitates the reloading of the weight. There is a problem that the shape of the weight has various restrictions.

Therefore, in order to solve the above-mentioned problem, there is provided an inexpensive weight error measuring apparatus which can greatly reduce the burden on an operator, can measure an error with a weight of any shape, and has a simple structure.

[0006]

In order to solve the above-mentioned problems, a weight error measuring device according to the first aspect of the present invention comprises a measuring means for individually measuring a weight to be calibrated or a standard weight, a weight to be calibrated or a standard weight. There are provided storage means for storing the respective weighed values, calculation means for calculating an error of the weight to be calibrated from both the weighed values stored in the storage means, and display means for displaying the error. In the invention according to claim 2, in the invention according to claim 1, the storage means stores one weighed value of the weight to be calibrated or the standard weight as a reference value, and stores the other weighed value as a value to be calibrated. And the computing means comprises:
The reference value is subtracted from the value to be calibrated, and the display means displays the error with a plus or minus sign. In the invention according to claim 3, in the invention according to claim 1 or 2, the long-term storage means for storing the weighed value of the weighing object being weighed, and the weighed value and the long-term storage means for the weighing object being weighed. Comparing means for comparing the measured value of the object to be weighed before. In the weight error measuring device according to the invention according to claim 4, two equivalent weighing pans on which the weight to be calibrated or the standard weight are individually placed, weighing means for weighing each weight together with the weighing pan, and each of the weights on the weighing means are provided. Exchange means for replacing the weighing pan; storage means for storing the weight value of each weight; computing means for calculating an error of the weight to be calibrated from the weight value of each weight stored in the storage means; and Is displayed. In the invention according to claim 5, in the invention according to claim 4, the storage means stores first weight means for storing a weight value when the weight to be calibrated is placed on one of the weighing pans, A second storage means for storing a weighed value when the weight is placed on the other weighing pan, a third storage means for storing a weighed value when the weight to be calibrated is placed on the other weighing pan, and a standard weight And a fourth storage unit for storing a weighed value when weighing the sample placed on one of the weighing pans, wherein the calculating unit calculates the weighed value based on the weighed value stored in each of the first storage unit and the second storage unit. First arithmetic means for calculating a first intermediate error, second arithmetic means for calculating a second intermediate error from the weighing values stored in the third storage means and the fourth storage means, respectively, It comprises a third calculating means for averaging the error. In the invention according to claim 6, in the invention according to claim 4 or 5, the weighing means is of an electronic type, and includes a mounting table on which a weighing pan is mounted, and the exchange means includes: An exchange table provided with two through holes through which the table can be penetrated, and moving means for moving the exchange table in the horizontal direction and the vertical direction, wherein the exchange table has a weight to be calibrated on one of the through holes. Is placed, and a weighing pan on which a standard weight is placed is placed on the other through-hole, and the moving means moves the exchange table in the horizontal direction, so that the One of the holes is located directly above the loading table, and the weighing dish is placed on the loading table by moving the exchange table downward, and the exchange table is By moving the weighing pan away from the platform by moving it upward, And the. In the invention according to claim 7, weighing means for individually weighing the weight to be calibrated or the standard weight, exchange means for replacing the respective weights on the weighing means, and storage means for storing the weighed value of each weight. Computing means for calculating the error of the weight to be calibrated from the measured value of each weight stored in the storage means, and display means for displaying the error, the measuring means is an electronic type, the A loading table on which a weight is placed, and an exchange means provided with two through holes through which the loading table can pass; moving means for moving the exchange table in horizontal and vertical directions The exchange table is for placing a weight to be calibrated on one of the through-holes and placing a standard weight on the other through-hole. By moving in the direction, any of the through holes It is to be located directly above the mounting table, and by moving the exchange table downward, the weight is mounted on the mounting table, and by moving the exchange table upward, The weight was separated from the mounting table.

[0007]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention. Weight error measuring apparatus 100 according to the present embodiment
Is a weighing means 2 such as a dedicated weighing means or a high-precision electronic balance capable of weighing the mass with particularly high accuracy, and two weighing dishes C, D, having the same weight for placing the weight A to be calibrated or the standard weight B,
Replacement means 10 for alternately placing these weighing plates C and D on the mounting table 3 of the weighing means 2, storage means 14, 16, 18, and 20 for storing the weighed values of the weighing means 2, Calculating means 22, 24, 2 for calculating the error of the weight A to be calibrated from the weighed values stored in the means 14, 16, 18, 20;
6, display means 28 for displaying the error, and moving means 1
1, storage means 14, 16, 18, 20 and arithmetic means 22,
Control means 1 for sending a command signal to 24, 26 and display means 28
2 is provided.

The exchanging means 10 comprises an exchanging table 4 and a moving means 11 capable of moving the exchanging table 4 in the vertical and horizontal directions and stopping at an appropriate position.

[0010] The storage means 14, 16, 18, and 20 are a first storage means 14 for storing a measured value when the weight A to be calibrated is placed on one of the weighing dishes C, and a standard weight B for storing the other weight. The second value that stores the weighed value when weighing it on the plate D
Storage means 16 and third storage means 18 for storing a measured value when the weight A to be calibrated is placed on the other weighing dish D and weighed.
And a fourth storage means 20 for storing the weighed value when the standard weight is placed on one of the weighing pans and weighed.

The operation means 22, 24, and 26 comprise a first operation means 22 for calculating a first intermediate error from the weighed values stored in the first storage means 14 and the second storage means 16, a third storage means 18, The second arithmetic means 24 calculates the second intermediate error from the weighed value stored in the fourth storage means 20, and the third means 26 averages the calculated values of the two arithmetic means 22 and 24. Here, the control means 12, the storage means 14, 16, 1
8, 20 and the arithmetic means 22, 24, 26 are realized by one microcomputer 110, and the exchange means 10
Is located separately from

The exchange table 4 is provided with two through holes 5 and 6 as shown in FIG. 2, and these through holes 5 and 6 are provided.
Is a circular hole whose diameter is smaller than the diameters of the weighing plates C and D and larger than the diameter of the mounting table 3 of the weighing means 2. The weighing plates C and D Although it cannot pass, the mounting table 3 of the measuring means 2 can pass through the through holes 5 and 6. Of course, these through holes 5, 6
The through hole is not limited to a circular hole, and may be a through hole of any shape as long as it can pass through the weighing plates C and D but can pass through the mounting table 3 of the weighing means 2.

Here, a method of measuring the error of the weight A to be calibrated using the weight error measuring apparatus 100 of the present embodiment according to the moving procedure of the exchange table 4 shown in FIG. 3 and the flowchart shown in FIG. State. Here, the mass of the weight A to be calibrated is A, the mass of the standard weight B is B, the mass of the weighing pan C is C, and the mass of the weighing pan D is D.

First, as step 1 (S1), the operator places the two weighing dishes C and D respectively on the through holes 5 and 6 of the exchange table 2, and further puts them on the weighing dish C. The calibration weight A is placed, and the standard weight B is placed on the weighing dish D. When the setting of both weights A and B and the two weighing dishes C and D is completed, a start switch (not shown) is turned on, and the weight error measuring device 10 is turned on.
0 is started, and the process proceeds to step 2 (S2).

In step 2 (S2), the control means 1
2 sends a command to the moving means 11 to move the weighing dish C, that is, the through hole 5, to a position directly above the mounting table 3 of the weighing means 2 as shown in FIG. Then, as shown in FIG. 3 (2), the exchange table 4 is gently lowered until the mounting table 3 projects upward from the through hole 5. Then, the weighing dish C on which the weight A to be calibrated is placed on the mounting table 3 of the weighing means 2. At this time, the control means 12 sends a command signal to the first storage means 14 and outputs the command signal from the weighing means 2. The measured value x1, that is, the sum A + C of the weight of the weight A to be calibrated and the weight of the weighing dish C is stored in the first storage means 14.

Next, proceeding to step 3 (S3), the control means 12 sends a command signal to the moving means 10 and gently lifts the exchange table 4 to the original height as shown in (3) of FIG. Further, the weighing dish D, that is, the through hole 6 is horizontally moved so that the weighing dish D is directly above the mounting table 3. Then, as shown in (4) of FIG. 3, the exchange table 4 is gently lowered until the mounting table 3 projects upward from the through hole 6. Then, the weighing dish D on which the standard weight B is placed is placed on the mounting table 3 of the weighing means 2. At this time, the control means 12 sends a command signal to the second storage means 16 and outputs the command signal from the weighing means 2. The weighing value y1, that is, the sum B + D of the weights of the standard weight B and the weighing dish D is stored in the second storage unit 1.
6 is stored. When the measurement value y1 is obtained, the control unit 12
Sends a command signal to the moving means 11 and quietly returns the exchange table 4 to its original height, as shown in (5) of FIG.

Next, proceeding to step 4 (S4), the number of times of weighing is counted.
Return to (S2). Thus, Steps 2 (S2) to 4 (S4) are repeated a predetermined number of times n, and the measured values x1, y1, x2, y2, x3, y3,----
xn and yn are measured and stored. When the measurement is completed n times, the process proceeds to step 5 (S5).

At step 5 (S5), the control means 1
2 sends a command signal to both storage means 14 and 16, sends the weighed value stored in each to the first calculation means 22, and calculates the first intermediate error in the following procedure.

Hereinafter, a case where n = 4 will be described as an example.
The first storage means 14 stores the measured values x1, x2, x3, and x4 of the sum A + C of the weights of the weight A and the weighing pan C, and the second storage means 16 stores the standard weight B and the weighing pan D. , The measured values y1, y2, y3, y4 of the sum B + D of the masses are stored. Then, from these measured values, the intermediate error αi
(Where i = 1, 2, 3, and −6) are sequentially obtained as follows. α1 = ((x1 + x2) / 2) -y1 α2 = x2-((y1 + y2) / 2) α3 = ((x2 + x3) / 2) -y2 α4 = x3-((y2 + y3) / 2) α5 = ((x3 + x4) / 2) -y3α6 = x4-((y3 + y4) / 2) The average value of these intermediate errors αi is defined as the first intermediate error α. That is, α = (α1 + α2 + α3 + α4 + α5 + α6) / 6. As described above, by subtracting the weighed value of one weight from the average value of the weighed values of the other weights measured immediately before and immediately after weighing the weight to obtain the intermediate error αi, the temperature, the atmospheric pressure, and the humidity are obtained. The influence of the error of the weighing value, which changes with time due to such changes, is minimized.

When the first-time intermediate error α is obtained, the process proceeds to step 6 (S6), where the control means 12 displays the weight change request on the display means 28 and the weight error measuring device 1
Stop 00. When a weight change request is made, the operator replaces the weight A to be calibrated on the weighing pan D and the standard weight B on the weighing pan C. When this replacement is completed, the start switch (not shown) is turned on again, and the weight error measuring device 100 is restarted. At the time of this restart, the weighing dish D, that is, the through hole 6 is directly above the mounting table 3 as shown in (5) of FIG.

When the weight error measuring device 100 restarts,
Proceeding to step 7 (S7), the control means 12 sends a command signal to the moving means 11, and as shown in (6) of FIG. Gently lower down. Then, the weighing dish D on which the weight A to be calibrated is placed on the mounting table 3 of the weighing means 2, and at this time, the control means 12 sends a command signal to the third storage means 18 and outputs the command signal from the weighing means 2. The measured value u1, ie, the weight A to be calibrated
And the sum A + D of the masses of the weighing dishes D is stored in the third storage means 18.

Next, proceeding to step 8 (S8), the control means 12 sends a command signal to the moving means 11 and gently lifts the exchange table 4 to the original height as shown in (7) of FIG. Further, the weighing dish C, that is, the through hole 5 is horizontally moved so that the weighing dish C is directly above the mounting table 3. Then, as shown in FIG. 3 (8), the exchange table 4 is gently lowered until the mounting table 3 projects upward from the through hole 5. Then, the weighing dish D on which the standard weight B is placed is placed on the mounting table 3 of the weighing means 2. At this time, the control means 12 sends a command signal to the fourth storage means 20 and outputs the signal from the weighing means 2. The fourth storage means 2 stores the weighing value v1, that is, the sum B + C of the weights of the standard weight B and the weighing dish C.
0 is stored. After obtaining the weighing value v1, the exchange table 4 is gently returned to the original height as shown in FIG.

Next, the process proceeds to step 9 (S9), in which the number of times of weighing is counted.
Return to (S7). In this way, Step 7 (S7) to Step 9 (S9) are repeated a predetermined number of times n, and the weighing value u
1, v1, u2, v2, y3, v3,----u
Find n and vn. When n measurements have been completed, step 1
Go to 0 (S10).

In step 10 (S10), the control means 12 sends a command signal to the two storage means 18 and 20, and sends the stored values to the second calculation means 24 as shown below. The second intermediate error is calculated by a simple procedure.

The third storage means 18 stores the weights u1, u2, u3, u of the sum A + D of the weight of the weight A to be calibrated and the weight of the weighing dish D.
4 is stored in the second storage means 20, and the measured values v1, v2, v3, and v of the sum B + C of the weights of the standard weight B and the weighing dish C are stored.
4 is stored. Therefore, an intermediate error βi (where i = 1, 2, 3, -6) is sequentially obtained from these measured values in the same manner as in step 5 (S5) as follows. β1 = ((u1 + u2) / 2) -v1 β2 = u2-((v1 + v2) / 2) β3 = ((u2 + u3) / 2) -v2 β4 = u3-((v2 + v3) / 2) β5 = ((u3 + u4) / 2) -v3β6 = u4-((v3 + v4) / 2) The average value of these intermediate errors βi is defined as a second intermediate error β. That is, β = (β1 + β2 + β3 + β4 + β5 + β6) / 6.

When the second intermediate error β is determined, the process proceeds to step 11 (S11), where the control means 12
A command signal is sent to the second and the second 24, and both intermediate errors α and β are sent to the third calculating means 26. Since both intermediate errors α and β can be expressed as (A + C) − (B + D) = α (1) (A + D) − (B + C) = β (2), the third arithmetic means 26 calculates the above equation (1) In addition to equation (2), 2A-2B = α + β (3) is calculated and further divided by 2, that is, both intermediate errors α and β
The final error of the weight A to be calibrated is calculated by the following equation: AB = (α + β) / 2 (4) This error is sent to the display means 28 and displayed. with this,
Complete the calibration of the weight.

In the above-described weight error measurement, the microcomputer 110 automatically controls the movement and stop of the exchange table 4, reads the measured values, and calculates the error from these measured values. Weighing pan C,
Only when the weights A and B are placed on D, when the weight A to be calibrated and the standard weight B are replaced on the other weighing pan, and when the weights A and B are finally unloaded from the weighing pans C and D, the operation is manually performed. .

According to this embodiment, the moving means 11 does not replace the weights A and B, which are not uniform in size and shape and require careful attention in handling, and the weighing pan has a uniform shape and is easy to handle. Since the weights C and D are changed while the weights are mounted, the weight error measuring device of the present embodiment can be manufactured at a low cost with a simple configuration, and can be used with weights of any shape. It is economical. In addition, although there is a small amount of work to manually place and remove the weights A and B on the weighing pans C and D, the mounting of the weighing pans C and D, reading of the weighing values, and calculation of errors are automatically performed. Therefore, the burden on the operator is greatly reduced. Further, the weighing dishes C and D can be easily replaced without grasping the weighing dishes C and D by performing a simple operation of simply moving the exchange table 4 in the vertical and horizontal directions. Therefore, the weight error measuring device can be made inexpensive with a simpler configuration, and the weighing dishes C and D are hardly damaged.

Next, a second embodiment will be described with reference to the block diagram shown in FIG. Weight error measuring device 12 of the present embodiment
0 is a weighing unit 2 placed on the weighing plate C on the mounting table 3, a storage unit 32 for sequentially storing the weighed value measured by the weighing unit 2 and the order of weighing, and a weighing unit stored in the storage unit 32. Among the values, it is determined that the odd-numbered weighing value is the weighing value of either the weight A to be calibrated or the standard weight B, and the even-numbered weighing value is the weighing value of the other weight. And a display means 38 for displaying the error.

As in the first embodiment, as the weighing means 2, a dedicated weighing means or an electronic balance capable of measuring the mass with particularly high precision can be used. Further, the storage unit 32 and the arithmetic unit 36 are realized by one microcomputer 130.

Further, in the present embodiment, when a storage switch (not shown) is pressed, the long-term storage means 34 for storing the weighed value of the weighing object currently being weighed, And a comparing means 35 for comparing the weighed values of the same objects to be weighed. The long-term storage means 34 is provided so that the memory is not lost for a long time even if the power switch is turned off. The result of comparison by the comparing means 35, that is, the difference between the weighed value of the weighing object currently being weighed and the weighed value stored in the long-term storage means 34 is obtained by pressing a comparison switch (not shown).
The information is displayed on the display means 38. The long-term storage means 34 and the comparison means 35 are also the microcomputer 1
30.

Therefore, when the measured value of the weight A to be calibrated is stored in the long-term storage means 34, the weight A to be calibrated is placed on the weighing dish C at a later date. The difference between the weighed value of the calibration weight A and the weighed value of the weight to be calibrated A stored in the long-term storage means 34 is indicated by the display means 3.
8 is displayed. Therefore, when the difference between the two is equal to or more than the predetermined value, it is immediately known that either the weight A to be calibrated or the error measuring device 120 has an abnormality. By the way, the comparison means 35 may simply send the two to the display means 38 and display them as a result of the comparison, instead of the difference between them.

Now, a method of measuring a weight error using the weight error measuring device 120 of this embodiment will be described with reference to the flowchart shown in FIG. In this embodiment, the replacement of the weight is performed manually.

When a start switch (not shown) of the weight error measuring device 120 is pressed, the storage means 32 reads the weighing value output from the weighing means 2 and enters a standby state.

Here, as step 1 (S1), the operator manually puts either the weight A to be calibrated or the standard weight B on the weighing dish C.

Then, the weighing means 2 outputs the weighed value, and proceeds to step 2 (S2), where the storage means 32 stores the weighed value.
The weighed value measured according to the above and the weighing order are stored.

Here, as step 3 (S3), the operator manually places the other of the weight A to be calibrated or the standard weight B on the weighing dish C.

Then, the weighing means 2 outputs the weighed value, and proceeds to step 4 (S4), where the storage means 32 stores the weighed value.
The weighed value measured according to the above and the weighing order are stored.

Here, as step 5 (S5), the operator instructs whether or not to end the measurement. When the operator wants to end the measurement, he pushes an end switch (not shown) to proceed to step 6 (S6). When the operator wants to continue the measurement, the calibration weight A or the standard weight is placed on the weighing pan C. One of the weights B is placed, and the process returns to step 1 (S1). For more accurate error measurement, it is desirable to repeat a large number of measurements, that is, steps 1 (S1) to 4 (S4), a number of times. Step 4 (S4) is 1
The error measurement can be performed only by performing the measurement several times.

At step 6 (S6), the operation means 3
Reference numeral 6 denotes a weighing value stored in the storage means 32, in which the odd-numbered weighing value is the weighing value of either the weight A to be calibrated or the standard weight B, and the even-numbered weighing value is the weighing value of the other weight. The average value of the odd-numbered measurement value and the even-numbered measurement value is determined, an error is calculated by subtracting both average values, and the error is sent to the display means 38 for display. Of course, in order to increase the accuracy, the error may be calculated by a method similar to step 5 (S5) or step 10 (S10) in the first embodiment. Thus, the error measurement operation is completed.

In this embodiment, although the weight is replaced by the operator manually, the weight error measuring device 120 automatically reads the weighing value and calculates the error, so that the burden on the operator is greatly reduced. Will be. Further, the storage means 32, the long-term storage means 34, and the calculation means 36 can be easily realized by one microcomputer and can be built in the weighing means 2, so that a convenient and inexpensive weight error measuring device 120 can be easily obtained.

Incidentally, the present invention is not limited to the above embodiment. For example, in the first embodiment, the weighing dishes C and D may be directly replaced by replacement means such as a robot having an arm without using the replacement table 4. Also,
Without using the weighing plates C and D, the diameters of the through holes 5 and 6 provided in the exchange table 4 are smaller than the diameters of both weights A and B and larger than the diameter of the mounting table 3 of the weighing means 2. And exchange table 4
The weights A and B are directly loaded on the
And the weights A and B may be weighed.

The accuracy of the weight error measurement can be made higher by considering the buoyancy caused by air. For example, in the embodiment shown in FIG. 1, assuming that an error due to buoyancy is F (kg), a weight error (A−B)
(Kg) is AB = (α + β) / 2 + F (kg). However, the volume of the weight to be calibrated is Va (m ³ ), the volume of the standard weight is Vb (m ³ ), and the volume of the weighing pan C is Vc.
(M ³ ) and the volume of the weighing dish D is Vd (m ³ ), the air density at the time of the first intermediate error measurement is ρ1 (kg / m ³ ),
If the air density at the time of the second intermediate error measurement is ρ2 (kg / m ³ ), F = ((ρ1 + ρ2) (Va−Vb) / 2) + ((ρ1
+ Ρ2) (Vc−Vd) / 2) (kg).

[0044]

As described above, claim 1 or claim 2
According to the present invention, although the weight is replaced by the operator manually, the weight error measurement device automatically reads the weighing value and calculates the error, so that the burden on the operator is greatly reduced. In addition, the storage means and the arithmetic means can be easily realized by an existing microcomputer and can be built in the weighing means, so that a convenient and inexpensive weight error measuring device can be easily obtained. According to the third aspect of the present invention, the weight value of the weight being measured can be stored in the long-term storage means, so that the current weight value of the weight to be calibrated and the previous weight to be calibrated stored in the long-term storage means are stored. Can easily be compared with the weighing value of
When the difference between the two is equal to or greater than the predetermined value, it is immediately known that either the weight to be calibrated or the error measuring device has an abnormality.
According to the fourth or fifth aspect of the present invention, the replacement of the weighing pan on the weighing means, the reading of the weighed value, and the calculation of the error are performed automatically, so that the burden on the operator is greatly reduced. In addition, the exchange means for replacing the weighing pan with the weighing means is a simple and easy-to-use weighing pan with a uniform shape that does not change the weight, which is not constant in size and requires careful attention in handling. The weight error measuring device of the present invention can be manufactured at a low cost with a simple configuration, and can be used with any shape of weight, so that it is convenient and economical. According to the invention according to claim 6, furthermore, by simply moving the exchange table in the vertical and horizontal directions, without holding the weighing pan, the weighing pan with the weight placed thereon is replaced with the weighing means. Since there,
The weight error measuring device can be manufactured at a low cost with a simpler configuration, and there is no risk of damaging the weight, making it difficult to damage the weighing pan. According to the invention according to claim 7, since the exchange table is simply moved vertically and horizontally, most of the weights can be easily replaced on the mounting table of the weighing means without grasping the weights. Can be manufactured at a lower cost with a simpler configuration than the conventional one, and the weight is hardly damaged.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main part of a weight error measuring device according to a first embodiment of the present invention.

FIG. 2 is a plan view of an exchange table provided in the weight error measuring device.

FIG. 3 is a diagram showing a procedure for moving the exchange table.

FIG. 4 is a flowchart showing a weight error measuring method using the weight error measuring device.

FIG. 5 is a block diagram showing a second embodiment of the present invention.

FIG. 6 is a flowchart illustrating a weight error measuring method using the weight error measuring device according to the second embodiment of the present invention.

[Explanation of symbols]

 2 Weighing means 3 Loading table 4 Exchange table 5, 6 Through hole A Weight to be calibrated B Standard weight C, D Weighing pan

Claims (7)

[Claims] 1. A weighing means for individually weighing a weight to be calibrated or a standard weight; a storage means for storing weighed values of a weight to be calibrated or a standard weight; and a weighing means based on both weighed values stored in the storage means. A weight error measuring device comprising: a calculating means for calculating a weight error; and a display means for displaying the error. 2. The storage means stores one measured value of a weight to be calibrated or a standard weight as a reference value, and stores the other measured value as a calibrated value.
The weight error measuring device according to claim 1, wherein the reference value is subtracted from the value to be calibrated, and the display unit displays the error with a sign of + or-. 3. A long-term storage means for storing a weighed value of an object to be weighed, and a weighed value of an object to be weighed and a weighed value of a previous weighed object stored in the long-term storage means. 3. A comparison device comprising: comparison means for comparing.
The weight error measuring device according to 1. 4. Equivalent two weighing pans for individually placing a weight to be calibrated or a standard weight, weighing means for weighing each weight together with the weighing pan, and exchange means for replacing each of the weighing pans on the weighing means. Storage means for storing the weight value of each weight, calculation means for calculating the error of the weight to be calibrated from the weight value of each weight stored in the storage means, and display means for displaying the error A weight error measuring device, characterized in that: 5. The storage means comprises: first storage means for storing a weighed value when the weight to be calibrated is placed on one weighing pan and weighing; and when the standard weight is weighed on the other weighing pan. Second storage means for storing the weighed value; and third storage means for storing the weighed value when the weight to be calibrated is weighed on the other weighing pan.
Storage means, and fourth storage means for storing a weighed value when the standard weight is placed on one of the weighing pans and weighed, and the arithmetic means is stored in each of the first storage means and the second storage means A first calculating means for calculating a first intermediate error from the measured value, and a second calculating means for calculating a second intermediate error from the measured values stored in the third storage means and the fourth storage means, respectively. 5. The weight error measuring apparatus according to claim 4, further comprising a third calculating means for averaging the two intermediate errors. 6. The weighing means according to claim 4, wherein the weighing means is of an electronic type and includes a mounting table on which a weighing dish is mounted. An exchange table provided with two possible through-holes, and moving means for moving the exchange table in the horizontal and vertical directions, wherein the exchange table has a calibration weight placed on one of the through-holes. A weighing dish is placed, and a weighing dish with a standard weight placed thereon is placed on the other through-hole.The moving means moves the exchange table in a horizontal direction, so that any one of the through-holes is moved. Is positioned directly above the platform, and the weighing pan is placed on the platform by moving the exchange platform downward, and the exchange platform is moved upward. Moving the weighing pan away from the platform. The weight error measuring apparatus according to claim 4 or 5, wherein 7. A weighing means for individually weighing a weight to be calibrated or a standard weight, an exchange means for changing the weights on the weighing means, a storage means for storing a weighed value of each weight, and the storage Calculating means for calculating the error of the weight to be calibrated from the weighed value of each weight stored in the means, and display means for displaying the error, wherein the weighing means is of an electronic type, and the weight is located above it. The exchange means comprises an exchange table provided with two through holes through which the exchange table can pass, and a moving means for moving the exchange table in a horizontal direction and a vertical direction. The exchange table is for placing a weight to be calibrated on one of the through holes and a standard weight on the other through hole, and the moving means moves the exchange table in a horizontal direction. By doing so, one of the through holes is Is intended to be located above, by moving the switchboard downward, which put the weight on the riding load platform,
A weight error measuring device, wherein the weight is separated from the mounting table by moving the exchange table upward.