JPH0593663A - Load cell adjuster - Google Patents

Abstract

(57) [Summary] [Purpose] Automatically and accurately adjust the four corners of the load cell.
Provided is an adjusting device capable of performing high quality and homogeneity in a short time. [Structure] XY table 2 movable in XY directions with a load cell attached for measuring and adjusting errors
And a weight 6 for measuring an error placed on the load cell attached to the table, a weight adding / removing means 7 for moving the weight 6 up and down, and a load signal output from the load cell when the weight is loaded. An error calculation calculation unit 11 that calculates and calculates an error at the four corners of the load cell from the reference data as a cutting position and a cutting amount, a cutting unit 23 that cuts the load cell based on this calculation, and a Z cutting unit for this cutting unit with respect to the load cell. And a Z table 21 that can be moved in any direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device used in a manufacturing process of a load cell, which is an electronic weighing component, to adjust four corner errors unique to each load cell.

[0002]

2. Description of the Related Art Conventionally, the adjustment of the four-corner error peculiar to a load cell is performed by manually moving a weight on the balance, and the operator searches the strained portion of the load cell while relying on the experience and feeling from the output signal display value. This was done by cutting the strained portion with a file.

[0003]

In the adjustment work by the operator, the weight is moved manually, so that the operator has a large degree of fatigue and the movement accuracy is deteriorated. In addition, when the worker performs cutting work based on his experience and feeling, insufficient cutting, excessive cutting, incorrect cutting position, etc. have occurred. Since the cutting is done with a file, the cutting efficiency and accuracy are poor, and the finished quality is also poor. As described above, there is a problem in that a great amount of time is required because the cutting and measurement are repeated until the errors at the four corners fall within the standard while performing all the adjustment work manually.

Therefore, it is an object of the present invention to provide an adjusting device which can automatically and accurately adjust the four corners of a load cell in a short time and can obtain a product of high quality and homogeneity.

[0005]

In order to solve the above problems, the present invention employs the following configurations. That is, the load cell error adjusting device according to the present invention is provided with an XY table that is movable in the XY direction with the load cell attached, a weight placed on the load cell attached to the table, and the weight. A weight adding and removing means for moving up and down,
An error calculation calculation unit that calculates the error at the four corners of the load cell as the cutting position and the cutting amount from the load signal output from the load cell and the predetermined reference data when loading the weight, and cuts the load cell based on this calculation. And a Z table capable of moving the cutting means in the Z direction with respect to the load cell.

[0006]

The weight can be loaded on the four corners of the load cell by moving the XY table and moving the weight up and down by the weight adding and removing means. When the weight is loaded on the four corners of the load cell, the error calculation calculation means calculates the error at the four corners as the cutting position and the cutting amount from the load signal output from the load cell and the predetermined reference data. Can be moved to move the cutting means to the cutting position to perform the error adjustment work. By controlling this series of operations, it is possible to automatically measure and adjust the error.

[0007]

1 is a diagram showing a configuration of a main part of a load cell adjusting apparatus according to an embodiment of the present invention. The load cell adjusting apparatus 1 is provided on an XY table 2 which moves in an XY direction. The load cell 4 is attached to the fixed base 3 thus obtained, and the error is measured and adjusted. The dish 5 is placed on the load cell 4 attached to the XY table 2, and the weight 6 is placed on the dish 5. The weight 6 can be moved up and down by the weight adjusting hanger 7. Therefore, by moving the XY table 2, the weight can be loaded at arbitrary positions at the four corners of the load cell. The movement of the XY table 2 is performed by the drive source thereof being driven by the drive 18 according to a command from the CPU 11.

The load signal output from the load cell 4 when a weight is loaded is input to the amplifier 9 shown in FIG.
It is processed by the CPU 11 via the / D converter 10 and stored in the RAM 13. The CPU 11 compares the reference load values input from the reference data setter 15 at the four corners of the load cell with the load values input from the load cell 4, calculates the error, and adjusts the error according to the error. The cutting position and cutting amount are calculated.

A pair of Z tables 21 are installed near the left and right of the XY table 2 (the right side is not shown). Z
A grinder 23 for cutting the load cell 4 is attached to the table 21 by a fixed base 24.
Next to the cutting tool 26 at the tip of the grinder 23, a suction nozzle 27 for sucking chips generated when the load cell is cut
Are also provided. The movement of the Z table 21 and the driving of the grinder 23 are performed by the drives 19 and 20 according to a command from the CPU 11.

FIG. 3 is a view showing the outer appearance of the adjusting apparatus of the embodiment, which is spatially arranged so that the front door 30 can be opened and the load cell can be attached to the fixed base 3 of the XY table 2. . Also, on the back side of the device, a chip suction nozzle 2
A tube 32 of a cleaner 31 that applies a negative pressure to 7 to absorb the chips is connected.

The measurement and adjustment of the error of the load cell by the apparatus of the above embodiment is carried out as follows. First, place the weight 6 in the center of the dish 5 placed on the load cell 4 so that
-If the Y table 2 is moved and the position is determined, the weight 6 is lowered by the weight addition / removal hanger 7 and the value at the center of the weight is measured. After the measurement, raise the weight 6, move the XY table 2 so that the weight comes to the right front of the dish 5, lower the weight 6, measure the value on the right front of the weight, and calculate the four corner errors on the right front. To do. Similarly, four corner errors are calculated for the remaining three corners.

From the measured four corner errors and the set reference data, the CPU 11 calculates and calculates the cutting position and the cutting amount (the cutting amount by the grinder, the feed amount) corresponding to the error. Based on this calculation, the XY table 2 and the Z table 21 are moved to position the grinder 23 at the cutting position, the cleaner 31 is activated, and then the rotary blade performs cutting. After the cutting work is completed, the four corner error is measured again, and if it is within the specified value, the adjustment work is finished. If it is out of the specified values, the cutting position and the cutting amount are calculated again, and the cutting is repeated.

As described above, according to the apparatus of the embodiment, since a series of operations such as the movement of the weight, the measurement and the adjustment of the error can be automated, the fatigue of the operator can be reduced, the movement accuracy can be improved, and the cutting accuracy can be improved. Accuracy and reliability can also be improved. In addition, the adjustment time can be greatly shortened due to automation.

In the above embodiment, the load cell attached to the XY table was moved to measure the error. However, the weight addition / removal hanger may be moved to the fixed load cell on the XY table. Good. Further, weights having the same weight may be arranged at the four corners and the center of the dish, and any weight may be moved up and down as required. Further, the cutting for adjustment may be performed by a robot equipped with a file.

[0015]

As is apparent from the above description, according to the load cell adjusting apparatus of the present invention, the weight for the error measurement can be moved without manpower, so that the fatigue of the operator can be reduced and the weight can be moved. In addition to being able to improve the accuracy, the accuracy and reliability of cutting work can also be improved. In addition, since a series of tasks such as error measurement and adjustment can be performed automatically, the adjustment time can be greatly shortened.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a main part of an apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a circuit for calculating a cutting position and a cutting amount based on measurement of an error.

FIG. 3 is a diagram showing an external view of an apparatus according to an embodiment.

[Explanation of symbols]

 1 load cell adjustment device 2 XY table 4 load cell 5 plate 6 weight 7 weight hanger (weight addition / removal means) 11 CPU (error calculation calculation means) 21 Z table 23 grinder (cutting means)

Claims (1)

[Claims] 1. An XY table movable in the XY directions with a load cell attached, a weight placed on the load cell attached to the table, and a weight adding / removing means for moving the weight up and down. , An error calculation calculation means for calculating the error at the four corners of the load cell as the cutting position and the cutting amount from the load signal output from the load cell and the predetermined reference data when the weight is loaded, and the load cell based on this calculation calculation result. A load cell adjusting device comprising a cutting means for cutting a blade and a Z table capable of moving the cutting means in the Z direction with respect to the load cell.