JP4142822B2 - Adjusting method of integrated Rovalval mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for adjusting a Roverval mechanism, and more particularly, to a method for adjusting a one-piece Roverval mechanism in which a fine adjustment portion is provided so as to exhibit appropriate performance as a guide mechanism, and the fine adjustment portion is adjusted to reduce the thickness.
[0002]
[Prior art]
A mechanism for transmitting the load applied to the device to a load measuring unit in an electromagnetic parallel weighing device, an electrostatic weighing device, a load cell weighing device (electric resistance wire weighing device), etc. A robotic mechanism is often provided for the purpose of guidance. As the Roverval mechanism, a structure that forms a quadrilateral by connecting a plurality of members with a spring material is generally used, but recently, an integrally formed Roverval mechanism is also used.
[0003]
The Roverval mechanism itself is configured accurately so that proper guidance for load transmission is possible, but it is necessary to adjust the weighing mechanism as a whole after combining with a member such as a load transmission mechanism or a weighing pan. In particular, it is important to adjust the four corners of the weighing pan. When a weighing object is placed on each part of the weighing pan, it is necessary to adjust the Roverval mechanism so as to obtain a correct measurement value regardless of the place on which the weighing item is placed.
[0004]
In the Roverval mechanism composed of a plurality of members, it is necessary to finely adjust the attachment state of the leaf springs connecting the upper, lower, left and right members corresponding to the four corner errors. Specifically, it is necessary to perform fine adjustment work such as rotating the four corner adjustment screws to change the size of the Roverval.
[0005]
[Problems to be solved by the invention]
On the other hand, in the integrated type Roverval mechanism formed from one metal block, fine adjustment is performed by cutting a specific part of the Roverval mechanism. FIG. 6 shows a conventional adjustment method of the integral type Roverval mechanism.
This Roverval mechanism is formed in the same shape as the strain-generating body frequently used in load cell type balances. Reference numeral 20 denotes an integral type robust mechanism formed integrally from a metal block such as an aluminum material, and has a configuration in which oval space portions 22A and 22B are formed at both ends via a central communication space portion 21. Thus, thin portions 22Aa, 22Ab, 22Ba, and 22Bb are formed above and below the space portions 22A and 22B, respectively.
[0006]
The fine adjustment in the integrated type robust mechanism 20 is performed by scraping any part of the thin part of the integrated type robust mechanism 20 with a file or the like to reduce the thickness corresponding to the four-corner error. However, adjustments must be made according to the load measurement value, and a measurement object such as a weight is placed on the weighing pan with the integrated Roverval mechanism incorporated in the adjustment jig so that the load can be measured. Is called.
[0007]
For this reason, it is spatially difficult to place a cutting device or put a hand on the thin wall portions 22Ab and 22Bb located on the lower side of the integral-type Roverval mechanism 20, and the processing location is that of the integrated-type Roverval mechanism 20. This is often performed on the upper thin portions 22Aa and 22Ba. However, even if cutting is limited to the thin part at the top, even if the cutting device is used, or it is either manual filing, the arrangement direction of the tools and devices used for cutting, and the cutting time The direction of the operation is a complete horizontal direction as indicated by an arrow in the drawing, or a direction slightly obliquely upward from this horizontal direction. However, in the integral type Roverval mechanism used in a high-precision weighing apparatus, slight distortion and stress generated when the Roverval mechanism is connected and fixed to the housing will affect the four-corner error. For this reason, the four corner adjustment is performed in a state in which various members such as various substrates are arranged around the housing. At this time, the operation from the horizontal direction or obliquely upward near this is accompanied by a large spatial restriction, and also in this respect, the fine adjustment work is difficult.
[0008]
As described above, the adjustment is performed by obliquely cutting any one of the front portions 22Aa ₁ , 22Aa ₂ , 22Ba ₁ , 22Ba ₂ of the upper thin portion 22Aa. It is necessary to adjust the thickness of the entire thin portions 22A and 22B. In this case, the work must be performed in a state in which the instruments and devices are arranged completely horizontally with respect to the thin wall portion, resulting in a further increase in the difficulty of the work. In addition, as shown in Japanese Patent Laid-Open No. 5-93663, a dedicated mechanical device has also been proposed, and the machining process itself is labor-saving. However, in these adjustment methods, the adjustment is highly accurate due to the heat generated during the adjustment. There is a problem that it is difficult to make the jig and the adjustment from four horizontal directions makes the jig complicated and large.
[0009]
The adjustment work is in an appropriate state by repeating the thinning work and the four-corner error measurement many times while comparing the amount of shaving (thickening amount) by manual work such as rasp and the degree of four-corner error. It is gradually adjusted. For this reason, as shown in FIG. 6 , in the conventional configuration that requires work in the horizontal direction, the adjustment work needs to be reduced in thickness in the front-rear and left-right directions from the side surface direction of the integrated type Roverval mechanism. In order to carry out such work, the product is rotated during adjustment, the worker moves around the product, and even if adjustment is performed by an automatic machine, the arrangement of the processing jig is changed or the product is rotated. And a slide operation are required, resulting in a reduction in work efficiency and a reduction in machining accuracy, and a long time is required to complete a series of adjustment operations. Further, the processing jig becomes complicated corresponding to a complicated processing step, and thus the jig becomes expensive.
[0010]
[Means for Solving the Problems]
The present invention is configured to solve the above-described problems of the prior art, and is configured to be able to be adjusted by an operation from above of the integral type Roverval mechanism when adjusting the integral type Roverval mechanism. For the upper thin part of the Roverval mechanism, the part to be adjusted is shown in advance, and if necessary, the integrated Roverval mechanism is provided with an indicator that indicates which part is processed in response to the four corner error In addition, there is provided an integrated robust mechanism having an adjusting mechanism, characterized in that a thinning process such as cutting is performed on the predetermined adjusted portion corresponding to the four corner error from above the integrated robust valve mechanism.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Of the thin portion of the integral type Roverval mechanism, on the surface side of the upper thin portion, a portion (machining guide portion) to be thinned by cutting or the like is indicated by means such as a recess or printing. In the adjustment of the integrated type robotic mechanism such as the four corner adjustment, the adjustment is performed by reducing the thickness of the thin portion with reference to the processing guide portion.
[0012]
【Example】
Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 shows a first embodiment. An arrow 1 is an integral type Roverval mechanism formed integrally from a metal block such as an aluminum material. In the illustrated configuration, oval space portions 3A and 3B are formed at both ends via a central communication space portion 2. Accordingly, thin portions 3Aa, 3Ab, 3Ba, and 3Bb are formed above and below the spaces 3A and 3B, respectively.
[0013]
Of the thin portion of the integrated type robust mechanism 1, the upper thin portions 3Aa and 3Ba are formed with a processing guide portion indicating a portion for adjusting the integrated type robust mechanism. In the configuration shown in the drawing, the processing guide portion is formed as a recess provided in the surface portion of each of the upper thin portions 3Aa and 3Ba. That is, three recesses 4a are formed in the surface portion of the upper thin portion 3Aa, and three recesses 4b are formed in the surface portion of the other upper thin portion 3Ba. Moreover, each recess is formed at equal intervals in the width direction (depth direction of drawing) of each upper thin part.
[0014]
The incorporation of a weighing dish and the load transfer mechanism relative integral Roberval mechanism, thus intends row four corners adjustment constitutes the load measurable state. In this case, since the processing guide portions 4a and 4b which are recesses having a substantially circular plane are formed in advance, the adjustment is performed by selecting a specific processing guide portion corresponding to the four-corner error. The side wall direction of the recess is implemented by reducing the thickness by cutting or the like. As an example of the thinning process, a rotary cutting tool is arranged so that the recess and the rotation axis coincide with each other, and cutting is performed so as to widen the inner diameter of the recess (the processing method of FIG. 2B described later). .
[0015]
The following advantages arise from the thinning process. First, since the thinning process is performed from the upper space of the integrated type robotic mechanism 1 as typified by the thick arrow X in the figure using a drill, a reamer, etc., it is spatial as in the conventional process from the lateral direction. There is no limit, and therefore, it is possible to use a large machining device in addition to manual operation, and the efficiency of adjustment work is greatly improved. Further, since the side wall portion of the recess is cut, the recess serves as a guide portion, and a sharp cutting tool can be used. As a result, the machining is performed immediately in response to the operation of the tool, and the frictional heat during the thinning process by cutting or the like can be minimized. If friction heat exceeding an allowable amount is generated in the thinning process, the measured value drifts due to the friction heat, and adjustment takes a long time. Incidentally, the allowable value or more friction heat is generated, this heat to cool at a single machining operation end from for example, about 15 minutes time no longer has to perform the following processing, a series of adjustment operations Contact It will take more time.
[0016]
FIG. 2 shows the above-described thinning method more specifically. First, in FIG. 3 (A), a case where the central recess 4Aa is processed among the recesses 4a of the thin portion 3Aa will be described as an example. First, as examples of the processing from the vertical direction indicated by an arrow Y is the working tool of the axis of the working tool of a large drill or reamer such an outer diameter in the center point of the recess than the inner diameter D ₁ of the said recess 4a Arrange so that is located. In this state, by disposing the processing tool in the thin wall portion 3Aa and cutting the peripheral wall of the recess 4a in a range corresponding to the outer diameter of the processing tool, the thin wall portion 3Aa has this cutting amount. It is thinned. Reference numeral 10A in FIG. 4B indicates this thinned portion. [0017]
Further, thinning may be performed by processing a plurality of places around the recess 4a by arranging the processing tool obliquely as indicated by an arrow Z in FIG. As this method, for example, a reamer or a rotary file is disposed obliquely in contact with a predetermined position on the upper end of the side wall of the recess 4a, and a plurality of files are provided in the circumferential direction of the recess 4a as shown in FIG. It is configured so as to form the thinned portion 10B of the place. Since this method can also adjust the number of thinned portions, it is possible to adjust a smaller amount of thinning.
[0018]
In the case of a strain element for a load cell having the same configuration as that of the integrated type robotic mechanism, a method of adjusting by performing a thinning process may be employed (for example, Japanese Patent Application Laid-Open No. Sho 62-66127). In the case of a load cell, the accuracy is at most tens of thousands, so the thickness of the thin portion can be relatively large, so that the thickness of the thin portion can be reduced in the thickness direction, that is, in the vertical direction. . However, in the integrated type robotic mechanism of the present invention, the accuracy is required to be several hundred thousand to one millionth or more, so the thickness of the thin portion is extremely thin. Regardless of this, the vertical thickness reduction is virtually impossible, as is the case with the load cell strained body. Therefore, as described above, the structure in which the thickness is reduced in the horizontal direction toward the periphery of the recess 4a as described above is extremely effective.
[0019]
Next, FIG. 4 shows a second embodiment which is constructed so as to more effectively adjust the integral type roval mechanism 1 shown in FIG.
In this embodiment, the indications indicating the four corners of the weighing pan 5 on the surface of the integral type robust mechanism 1 are shown by a method such as printing. In the illustrated configuration, the four corner indications 6 are indicated by symbols in directions in which the four corners of the weighing pan are easily visible from the working direction on the basis of the case where adjustment work is performed from the direction indicated by the arrow A with respect to the integral type robust mechanism 1. Yes. Of the four corner displays 6, F indicates the front of the weighing pan 5, B indicates the rear, L indicates the left, and R indicates the right. In addition, the respective processing guide portions 4a and 4b, which are recesses, are denoted by reference numerals 1 to 6 as shown in the figure, and each processing guide portion can be specified by the reference numeral.
[0020]
In such a configuration, a specific mass is added to each corner of the weighing pan 5 to adjust the four corners. In this case, processing to be cut using the following table corresponding to the mass display at the four corners. If the guide portion is specified, the adjustment work can be carried out more effectively. In the table, “light” indicates that the added load is displayed lighter than the actual mass, and “heavy” indicates that the added load is displayed heavier than the actual mass. Show.
[0021]
[Table 1]
┌───────┬───────┬───────┬───────┐
│Four corners │Processing number │Four corners │Processing number │
├───────┼───────┼───────┼───────┤
│ F Light │5 or 4, 6 │ R Light │ 4 or 1 │
├───────┼───────┼───────┼───────┤
│ F │ │ 2 or 1, 3 │ R │ │ 6 or 3 │
├───────┼───────┼───────┼───────┤
│ B Light │2 or 1, 3 │ L Light │ 6 or 3 │
├───────┼───────┼───────┼───────┤
│ B weight │5 or 4, 6 │ L weight │ 4 or 1 │
└───────┴───────┴───────┴───────┘
F: Front, B: Rear, R: Right, L: Left
FIG. 3 shows a third embodiment.
In this embodiment, a series of grooves are formed in the surface portions of the thin portions 3Aa and 3Ba as processing guide portions (indicated by reference numerals 7a and 7b) in the width direction of the thin portions 3Aa and 3Ba. . In this embodiment, since the processing portion is formed as a series of grooves, it requires skill to specify the processing position as compared with the case of processing the specific recess shown in the embodiment corresponding to the four corner error. The adjustment work can be determined by the relationship between the machining position in the groove direction and the cutting amount, and even if there is a certain amount of error, the cutting amount can be determined in advance and the cutting position corresponding to the cutting amount can be determined or In addition, it is possible to adopt a method in which the processing position is determined in advance and adjusted by the cutting amount. In this embodiment as well, the machining direction is to be machined from the upper part of the integrated Roverval mechanism.
[0023]
Next, FIG. 5 shows a fourth embodiment.
In this embodiment, the configuration of the present invention is carried out with respect to the integral type robust mechanism (Japanese Patent Laid-Open No. 11-87937) previously proposed by the inventors.
An arrow 101 indicates an integral type robust mechanism, 101A is a fixed portion that is supported and fixed to a supporting member on the weighing apparatus main body side, and 101B is a load receiving portion that receives a load W of a weighing object or the like. Further, two thin portions are formed at the upper and lower portions of the integrated type robotic mechanism 101, and a recess is generated as a processing guide portion for at least one of the upper thin portions 101a and 101b. I'm. In the configuration shown in the figure, processing guide portions are formed on both the thin portions 101a and 101b as 4a and 4b.
[0024]
Beam-like portions 103 are formed on both sides of the integral-type Roverval mechanism 101 so as to protrude along the longitudinal direction of the integral-type Roverval mechanism 101, and the fulcrum mounting portion 106 of the beam-like portion 103 has a fulcrum member such as a leaf spring. A load transmitting beam 107 is attached via 108, and the load transmitting beam 107 is connected to a load receiving portion 101 B of the integral type Roverval mechanism 101 by a connecting member (not shown), and a load W applied to the integral type Roverval mechanism 101. Is transmitted to an electromagnetic unit (not shown) via the load transmitting beam 107.
[0025]
In the integrated Roverval mechanism having a complicated configuration as described above, the space in which the processing tool is to be placed is practically only at the top of the integrated Roverval mechanism, and the thickness of each thin portion is extremely high to ensure high accuracy. Since it is thin, fine adjustment is difficult except according to the present invention.
[0026]
As described above, each of the processing guide portions in each embodiment is formed by performing mechanical processing such as a recess or a groove on the integrated Roverval mechanism. In addition to this, the processing guide portion is formed by a method such as printing. It is possible to form as well. In addition, by adjusting the thickness of the processing guide portion to be adjusted, the error is adjusted in a negative direction, that is, the error is reduced, but the adjustment is opposite to the processing guide portion to be adjusted. Adjustment in the plus direction is also possible by cutting the processing guide portion. For example, when the amount of cutting is too large and a minus error occurs, it is possible to perform a plus adjustment by thinning the opposing machining guide portions to make an appropriate adjustment. In the above-described embodiments, the present invention has been described by taking an example of the integral type robust mechanism, but it can be easily estimated by those skilled in the art that the present invention can be applied to a load cell strain body.
[0027]
【The invention's effect】
As described above with reference to each of the embodiments, according to the present invention, the adjustment of the integral type Roverval mechanism is performed on the upper part of the Roverval mechanism that does not interfere with the arrangement of the tool with respect to the thin upper portion of the integral type Roverval mechanism. In the upper part of the integrated Roverval mechanism, the side wall of the processing guide can be adjusted by reducing the thickness in the horizontal direction. As a result, the destruction of the Roverval mechanism due to the above-mentioned is greatly reduced, and the mechanism can be adjusted accurately in a short time with a high yield.
[0028]
In addition, adjustment can be performed by selecting the part to be processed from the processing guide part, so that adjustment work can be performed accurately and quickly without requiring a high level of skill compared to the conventional method, and the arrangement of tools Since the position is at the upper part of the integrated Roverval mechanism that can secure a sufficient space, the adjustment of the Roverval mechanism can be easily performed.
[Brief description of the drawings]
FIG. 1 is a perspective view of an integrated roberval mechanism showing a first embodiment of the present invention.
2A is a cross-sectional view taken along the line AA of FIG. 1, FIG. 2B is an example of the BB view of FIG. 1A, and FIG. 2C is another example of the BB view of FIG. Indicates.
FIG. 3 is a perspective view of an integral type roberval mechanism showing a third embodiment of the present invention.
FIG. 4 is a plan view of an integrated roberval mechanism showing a second embodiment of the present invention.
FIG. 5 is a perspective view of an integrated Robert valve mechanism showing a fourth embodiment of the present invention.
FIG. 6 is a perspective view of an integrated type robust mechanism showing a method for adjusting a conventional integrated type robust mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Integral type robot mechanism 2 Central space part 3A, 3B Oval space part 3Aa, 3Ba Upper thin part 4a, 4b Processing guide part (recess)
5 Weighing pan 6 Four corner indication display 7a, 7b Machining guide (groove)
10A, 10B Thinning processing portion 101 Integrated Robertal mechanism 103 Beam-shaped portion 101a, 101b Upper thin portion 107 Load transmission beam

Claims (3)

  A method of adjusting the integrated Roverval mechanism after configuring the integrated Roverval mechanism having four thin portions of 3Aa, 3Ab, 3Ba, 3Bb above and below as a weighing mechanism by combining with other members, Among the surfaces of the two thin portions 3Aa and 3Ba, at least one of the thin portion surfaces is provided with a plurality of recesses in advance as cutting targets in the width direction of the thin portion in advance. In addition, a predetermined machining guide portion is selected from the plurality of machining guide portions 4a or 4b, and a tool is disposed above the Roverval mechanism, and the side wall portion of the selected machining guide portion is substantially horizontally oriented by the tool. A method for adjusting an integral type Roverval mechanism, characterized in that the integral type Roverval mechanism is adjusted by cutting into a single piece. In the cutting process, one or more thinning portions 10B are formed on the side wall of the processing guide part 4a or 4b by arranging the cutting tool obliquely with respect to the side wall of the selected processing guide part 4a or 4b. The method of adjusting an integral type Roverval mechanism according to claim 1, wherein: On the surface portion of the integrated type robotic mechanism 1, a four-corner display 6 indicating the four corners of the weighing pan 5 and a display for specifying individual processing guide portions of the processing guide portions 4 a or 4 b are displayed. Corresponding to the weight of the mass display, a list of which processing guide portion of the processing guide portion should be processed is prepared. 3. The method of adjusting an integral type roberval mechanism according to claim 1 or 2 , wherein the processing guide portion is selected, and the four corners of the weighing pan are adjusted by cutting the selected processing guide portion.

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