JP3028629B2 - Scale equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scale device for reading a scale formed on a main scale by magnetism or the like.

[0002]

2. Description of the Related Art There is known a scale device in which a scale formed by magnetism or the like on a long main scale is read by a detection unit such as a magnetic head.

In the scale device, a main scale,
The detecting section and the like are housed in a tubular housing, and the housing prevents cutting oil and the like from adhering to the scale device.

In general, the housing is formed by extruding aluminum, while precision measuring instruments and machine tools equipped with a scale device are mainly formed of cast iron.

[0005] In this case, since the thermal expansion coefficients of cast iron and aluminum are greatly different from each other, the accuracy of the scale device is deteriorated due to a change in the use environment temperature.

[0006] For example, in an optical scale (the scale of the main scale is made optically readable),
Because the main scale is formed of glass, the difference in the thermal expansion coefficient between the glass and the housing also causes the accuracy of the scale device to deteriorate, and at the worst, the main scale may be damaged due to excessive load. There is also.

Further, for example, in the case of a magnetic scale (in which the scale of the main scale is made readable by a magnetic head), it is necessary to separately provide a magnetic shield plate for shielding an external magnetic field. Affect.

Therefore, it is desirable to form a housing by bending a material (iron or an alloy containing iron; hereinafter, referred to as an iron-based metal) having a thermal expansion coefficient substantially equal to that of iron.

The coefficient of thermal expansion of aluminum is 23 ×
10 ^-6 / ° C, 11 × 10 ^-6 / ° C for iron, 7 × 10 for glass
⁻⁶ / ° C.

[0010]

However, when iron is bent by general press forming or the like, the degree of freedom of the bent shape is small, and the bending is basically limited to a U-shaped cross section. .

In addition, if the ratio (W / T) of the U-shaped opening width W to the depth T is not more than the value (2/3), the bending process is performed due to the rigidity and durability of the bevel blade portion. Cannot be performed.

For this reason, it is necessary to provide a cover member by extrusion molding of aluminum separately from the housing. In addition, the main scale is available in various lengths according to the machine tool equipped with the scale device.
In general press molding, there are many types of press dies.

[0013] In addition, when bending is required three times or more,
Further, since the number of press dies increases, it is practically impossible to form the housing by general press molding.

An object of the present invention is to provide a scale device in which the housing of the scale device can be formed by bending and the coefficient of thermal expansion of the housing can be arbitrarily set by using a ferrous metal as a material. Is to do.

[0015]

As can be understood from FIGS. 1 and 12, a scale device according to the present invention is a scale device 100 having a housing 60. It is formed into the following shape by passing through a roll forming machine 7. Here, the roll forming machine 7 continuously arranges a plurality of forming rollers each including a pair of upper and lower rollers. The shape is
The cross section perpendicular to the longitudinal direction of the housing 60 has the following shape. That is, both ends of the iron-based metal plate 30 are
The shape is bent until the direction of each tip rotates more than 180 degrees from the original direction, and then the entire iron-based metal plate 30 is bent in a substantially U-shape. Further, the scale device according to the present invention includes the housing 6
0, the housing 6
0 indicates forming the iron-based metal plate 30 into a set of upper and lower rollers.
Roll forming machine 7 in which a plurality of sets of rollers are continuously arranged,
Is obtained by molding by passing the shape of the cross section of the housing 60 in its entirety is shaped substantially U,
Both ends of the substantially U-shape are bent inside the substantially U-shape, the bent shape is an open shape, and the direction of the tip of both ends is substantially U-shaped. Are rotated more than 180 degrees from the direction toward the openings on the two parallel sides. The scale device according to the present invention is a scale device having the above-described configuration in which both ends are bent twice. Further, the scale device according to the present invention,
This is a scale device having the above-described configuration in which both ends are bent in a curved shape. Further, the scale device according to the present invention,
In the scale device 100 having the housing 60,
The housing 60 is formed into the following shape by passing the iron-based metal plate 30 through the following roll forming machine 7. Here, the roll forming machine 7 controls the upper and lower rollers by one.
A plurality of pairs of forming rollers are continuously arranged. Further, in the cross section perpendicular to the longitudinal direction of the housing 60, both ends of the iron-based metal plate 30 are bent into L-shapes, and further bent at about 90 degrees. Is bent into a substantially U-shape. Further, in the scale device according to the present invention, in the scale device 100 having the housing 60 , the housing 60
An iron-based metal plate 30 is formed by a molding
Are passed through a roll forming machine 7 in which a plurality of sets are continuously arranged.
Is obtained by molding whereby, the overall shape of the cross-section of the housing 60 is shaped substantially U, the shape of both ends of -like sectional shape, molded bent three times the inside, It is an open square.

[0016]

In the scale device according to the present invention, the iron-based metal plate 30 having a desired length is used, and the metal plate 30 is roll-formed a plurality of times to form the housing 60.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a scale device according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a housing forming line 1 of a scale apparatus to which the present invention is applied.
The plate-shaped iron-based metal plate 30 (hoop material) wound around the sheet is rolled by a leveler 5 having a driving roller 5A by a roll forming machine 7.
Is transferred to

The hoop material 30 bent into a desired shape by the roll forming machine 7 is cut by the cutting machine 9 to form one housing 60.

In the base 50 on which the roll forming machine 7 and the like are installed, a recess 50A for the hoop material 30 is formed between the roll forming machine 7 and the leveler 5.

Here, as understood from FIG. 2, the roll forming machine 7 has a pair of forming rollers 2 including upper and lower rollers.
18 are provided, and each time the hoop material 30 sequentially passes between the upper rollers 2A to 18A and the lower rollers 2B to 18B, the hoop material 30 is bent.

In this case, the hoop material 30 is formed so that the sectional shape of the housing 60 has a groove or the like to which a dust seal can be easily attached. The continuous foot portion is also integrally formed.

As the iron-based metal, Fe or C
An alloy of u, Ni, and Fe can be used, and the thermal expansion coefficient can be appropriately set by selecting the iron-based metal.

Next, a method of forming the hoop material 30, which is an essential part of the present invention, will be described with reference to FIGS.

As can be understood from FIGS. 3 and 4, both ends (width direction) of the hoop material 30 are bent by the angle θ ₁ by the rollers 2 and 4.

In this case, between the roller 2 and the roller 6, several types of rollers whose θ ₁ sequentially increases are arranged, and the roller 6 sets θ ≒ 90 ° (see FIG. 5).

Next, both ends (width direction) of the hoop material 30 are bent in an L-shape by the rollers 8 and 10 provided with various inserts 40 between the upper and lower rolls (FIGS. 6 and 7). .

Subsequently, by using various inserts 40, both ends (width direction) of the hoop material 30 are
At 14, further bending is performed (FIGS. 8 and 9), and θ ₂ ≒ 90 °.

Further, the hoop material 30 is bent by the rollers 16 and 18 into a desired shape (FIGS. 10 and 11) by using various inserts 40, and cut into a desired length by the cutting machine 9. Thus, a housing 60 is formed.

Therefore, housings of various lengths required for the scale device can be easily formed.

The roller 8, the roller 10, and the roller 10
Between the roller 12, the roller 12, the roller 14, the roller 14, the roller 16, and the roller 16 and the roller 18,
Further forming rollers are arranged according to the bending of the bending process,
These forming rollers have an insert 40 corresponding to the bending.
Are arranged respectively. FIG. 12 shows an example of a housing 60 formed by a roll forming process.
FIG. 12A shows a housing 60 formed in this embodiment.

In this case, by arranging a molding roller having a predetermined shape and an insert 40, for example, as shown in FIG.
The shape shown in FIG. 2C is obtained.

It should be noted, housing 60 shown in FIG. 1 2 C
The hoop material 30 is formed so that the cross-sectional shape thereof becomes a shape 60B having a groove or the like to which a dust seal can be easily attached, and a continuous foot portion 60C is also integrally formed.

The housing 6 formed as described above
13, a glass main scale 102 and a slider 104 that slides on the main scale 102 via a slider 106 are housed therein.

In this case, the housing 60 has an opening 60.
A is formed, and the slider 104 is supported by the slider fixing portion 108 protruding from the opening 60A to the outside of the housing 60.

The opening portion 60A is provided with a rubber 110 for preventing intrusion of cutting oil and the like.

As described above, in this embodiment, the hoop material 30 made of an iron-based metal is roll-formed a plurality of times to form the housing 60 of the scale device 100.
A housing 60 having an arbitrary coefficient of thermal expansion can be formed.

For example, in the case of an optical scale, the reliability of the scale device 100 can be improved by forming the housing 60 having a thermal expansion coefficient substantially equal to that of the main scale.

In the case of, for example, a magnetic scale, parts attached to the housing 60 such as a cover and a foot plate can be integrally formed by roll forming.
The number of parts is reduced, and the manufacturing cost of the scale device 100 can be reduced. The side of the housing
In the cross section, the shape of both ends of the housing is as described above.
It is not limited to the shape of the embodiment. Dust seal
The shape is such that the
If it is difficult for the seal to come off, use another shape.
Can be used. For example, both ends twice
It is bent shape and both ends are
Is rotated more than 180 degrees from the original direction.
There is a bent shape. In addition, both ends
It has a curved shape and both ends
The direction of the tip turns more than 180 degrees from the original direction
Until you have a folded shape. In short, both ends
The direction of each tip is more than 180 degrees from the original direction
Bent shape or both ends until large rotation
The direction of the tip of the
It is rotated more than 180 degrees from the direction
That would be good.

[0040]

As will be understood from the above description, in the scale device according to the present invention, a metal plate having a desired length made of an iron-based metal is used, and this metal plate is roll-formed a plurality of times to form a housing. Is done. Therefore, a housing having an arbitrary coefficient of thermal expansion can be formed.

For example, in the case of an optical scale,
Since a housing having a thermal expansion coefficient substantially equal to the thermal expansion coefficient of the main scale can be formed, the reliability of the scale device is improved.

In the case of a magnetic scale, for example, the number of parts attached to the housing, such as the cover and the foot plate, is reduced, and the cost of the scale device can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall schematic view of a preferred embodiment of a scale device according to the present invention.

FIG. 2 is a configuration diagram of a roll forming machine.

FIG. 3 is a sectional view taken along line II in FIG. 2;

FIG. 4 is a sectional view taken along line II-II in FIG.

FIG. 5 is a sectional view taken along line III-III in FIG. 2;

FIG. 6 is a sectional view taken along line IV-IV in FIG. 2;

FIG. 7 is a sectional view taken along line VV in FIG.

8 is a sectional view taken along line VI-VI in FIG.

FIG. 9 is a sectional view taken along line VII-VII in FIG. 2;

FIG. 10 is a sectional view taken along line VIII-VIII in FIG.

FIG. 11 is a sectional view taken along line IX-IX in FIG. 2;

FIG. 12 is a cross-sectional view of a roll-formed housing.

FIG. 13 is a schematic structural view of a scale device.

[Explanation of symbols]

Reference Signs List 1 housing forming line 3 reel 5 leveler 7 roll forming machine 2, 4, 6, 8, 10, 12, 14, 16, 18 forming roller 9 cutting machine 30 hoop material (iron-based metal plate) 60 housing 60B groove 60C foot Unit 100 scale device 102 main scale 104 slider

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-250933 (JP, A) JP-A-3-87227 (JP, A) JP-A 64-25005 (JP, A) 12612 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01B 21/00-21/32 G01B ^7/ 00-7/34

Claims (6)

(57) [Claims] 1. A scale device having a housing, wherein the housing is formed into the following shape by passing an iron-based metal plate through the following roll forming machine. (A) The roll forming machine arranges a plurality of forming rollers, one set of upper and lower rollers, continuously. (B) The shape is the following shape in a cross section perpendicular to the longitudinal direction of the housing. (B-1) A shape in which both ends of the iron-based metal plate are bent until the directions of the respective tips rotate more than 180 degrees from the original direction. (B2) A shape in which the entire iron-based metal plate is bent into a substantially U-shape. 2. A scale device having a housing, wherein the housing includes an iron-based metal plate and a pair of upper and lower rollers.
Roll forming that continuously arranges multiple sets of forming rollers
The housing is formed by passing it through a machine, and the cross section of the housing has a substantially U-shape as a whole, and both ends of the substantially U-shape are: (B) the bent shape is an open shape, and (c) the direction of the ends of the both ends is parallel to the substantially U-shape. A scale device, which is rotated by more than 180 degrees from a direction toward two side openings. 3. The scale device according to claim 1, wherein both end portions are bent twice. 4. The scale device according to claim 1, wherein both end portions are bent in a curved shape. 5. A scale device having a housing, wherein the housing is formed into the following shape by passing an iron-based metal plate through the following roll forming machine. (A) The roll forming machine arranges a plurality of forming rollers, one set of upper and lower rollers, continuously. (B) In the cross section perpendicular to the longitudinal direction of the housing, each of the two ends of the iron-based metal plate is bent into an L-shape, further bent at about 90 degrees, and then the iron-based metal plate Is bent into a substantially U-shape. 6. A scale device having a housing, wherein the housing includes an iron-based metal plate and a pair of upper and lower rollers.
Roll forming that continuously arranges multiple sets of forming rollers
The machine is obtained by molding by passing the shape of the cross section of the housing is shaped in its entirety substantially U shape at both ends of the shape of the substantially U is bent three times inside A scale device having an open and substantially rectangular shape formed and formed.