JPH0641080B2 - Positioning device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a positioning device used for a measuring device, a light processing machine, or the like.

(Structure of Conventional Example and Problems Thereof) A conventional positioning device will be described with reference to FIGS. 1 and 2 by taking a case of a rectangular object as an example.

In FIG. 1, a positioning device includes two rectangular guide pieces 2 and 3 fixed in parallel to adjacent reference planes of the object 1 in order to fix the rectangular object 1 in a predetermined position.
And sliding pieces 4 and 5 which slide in the directions perpendicular to the guide surfaces of the guide pieces 2 and 3, respectively, and guide adjacent reference surfaces of the object 1 to the guide pieces 2 and 3. Positioning is performed by pressing the surfaces with sliding pieces 4 and 5 that slide in a direction perpendicular to the surfaces.

FIG. 2 shows another conventional example, in which the positioning device is
In order to fix the rectangular object 1 at a predetermined position, two rectangular guide pieces 2 and 3 fixed in parallel to the adjacent reference planes of the object 1 and the above reference when the positioning is completed. And a sliding piece 6 having an L-shaped guide surface that contacts two side surfaces opposite to the surface, and the moving direction of the sliding piece 6 is defined by the line of intersection of the guide surfaces of the guide pieces 2 and 3 described above. Sliding piece 6
Of the L-shaped guide surface is aligned with a plane including the intersection line of the L-shaped guide surfaces, and the reference surfaces adjacent to each other of the object 1 are pressed against the guide surfaces of the guide pieces 2 and 3 by one sliding piece 6 to perform positioning. It is a thing.

However, most of the sliding pieces 4 to 6 have a structure in which a spring (not shown) is used to press the object 1 against the guide pieces 2 and 3, and in the case of the positioning device of FIG.
The load W ₁ against which the object 1 is pressed against the guide piece 3 is W, if the pressure of the spring is P ₁ , the friction coefficient between the object 1 and the guide piece 2 is μ ₁ , and the frictional resistance of the sliding part is R _{1. 1} = P ₁ − (μ ₁ P ₁ + R ₁ ) and similarly the load W _{2 at} which the object 1 is pressed against the guide piece ₂
, If the pressure of the spring P _2, the frictional resistance of the sliding portion and R _2, since the coefficient of friction is the _{same, W 2 = P 2 - (} μ 1 P 2 +
R ₂ ). When the pressing loads W ₁ and W ₂ are not equal, there is a problem that the positioning accuracy is lowered due to a subtle difference in the positioning timing in the two directions.

In the positioning device shown in FIG. 2, the moving direction of the sliding piece 6 coincides with the plane including the line of intersection of the guide surfaces of the guide pieces 2 and 3 and the line of intersection of the L-shaped guide surface of the sliding piece 6, In addition, each of the L-shaped guide surfaces needs to contact the object 1 with the same pressing force, and there is a tolerance of the width of the object 1, which makes it difficult to perform stable and precise positioning.

(Object of the Invention) The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a positioning device capable of performing precise positioning with a simple configuration.

(Structure of the invention) In order to achieve the above-mentioned object, a pressing force having a component force parallel to the guide surfaces, which is oriented in the direction of the line of intersection of the two guide surfaces, on the other two or more sides of the object that are not in contact with the two guide surfaces. It is equipped with a plurality of sliding pieces to be pressed by, so that all of the pressing force of the sliding pieces are directed in the direction of the intersection line, and the pressing force is applied to the two or more sides of the object in the direction of the intersection line of both guide surfaces. This ensures that the object is positioned by both guide surfaces, and that the sliding pieces have an angle in the direction of the guide pieces that do not face each other. It is intended to assist the pressing force of the moving piece so that the reference surface of the object and the guide surface of the guide piece are always in close contact with each other.

(Explanation of an Example) An example of the present invention will be described with reference to FIG.

In the figure, a positioning device according to the present invention comprises two rectangular guide pieces 2 and 3 fixed in parallel to adjacent reference surfaces of an object 1 and the guide pieces 2 and 3 in the sliding direction.
The sliding pieces 9 and 10 are arranged along a plane facing the line of intersection of the guide surfaces.

With this configuration, as shown in the force vector diagram using the sliding piece 9 as an example, the main pressing direction (main vector) that determines the final position of the object 1 is applied in the direction of the intersection line. The pressure P ₁ pushes the object 1 against the other guide piece 3 by the action of the vector value Py parallel to the guide surface of the one guide piece 2, and the vector piece P perpendicular to the guide surface of the one guide piece 2
The function of x causes the object 1 to slide on the guide surface of the other guide piece 3.

Further, the sliding piece 10 also acts so that the pressing force is such that the main pressurizing direction is in the direction of the intersection line, and the object 1 is pressed against the one guide piece 2 and slid.

Unlike the embodiment, if the directions of both main vectors are not in the direction of the intersecting line of the guide surface, the balance between both main vectors becomes important and there is a problem that the final positioning of the object is lacking, but as described above. In this embodiment, the sliding piece 9,
At both pressurizing forces of 10, the main pressing directions that determine the final position of the object 1 are both directed in the direction of the intersecting line and have the above-mentioned component force, so that the two sides of the object 1 are guided respectively. It acts as a force that causes the guide lines of the pieces 2 and 3 to be directed in a balanced and reliable and stable manner, and the positioning of the object 1 by both guide pieces 2 and 3 can be performed reliably and stably. Even if there is a time difference between the pressing forces of the sliding pieces 9 and 10 applied to the sliding piece, the delayed pressing force of the sliding piece can be assisted by the component force of the pressing force, so that highly accurate positioning can be performed.

However, rotating contacts 9a and 10a are attached to the sliding pieces 9 and 10, and rolling bearings having a cylindrical outer circumference are used so that no component force in the direction of separating from the other guide pieces 3 and 2 is generated. It is desirable to do.

In the present embodiment, the rectangular object 1 has been described as an example, but the projected rectangular shape is a polygonal object having four or more sides (not shown).
A guide plate 2 and 3 having a vertical flat surface as a guide surface on a surface plate (not shown) that guides the two sides serving as the reference, and a plurality of other plural pieces on the opposite side of the guide surface that do not contact the guide surface. The same effect can be obtained if a pressing force is applied to the side and a component of which the direction is directed along the guide surface to the intersection line of the guide surfaces is generated.

(Effects of the Invention) As described above, according to the present invention, the main pressing force that determines the final position of the object in the direction of the line of intersection of both guide surfaces with respect to each of two or more sides of the object. Since the pressing force in the direction is applied, the force that directs the object in the direction of the intersecting line is applied in a well-balanced manner, positioning of the object by both guide surfaces can be performed reliably and stably, and sliding applied to the object Even if there is a time difference in the pressing force by the bridge, the delayed pressing force of the sliding bridge can be assisted by the component force of the pressing force, so high-precision positioning can be performed, and a simple structure and high-precision positioning device can be obtained. The measurement accuracy or the processing position accuracy can be improved.

[Brief description of drawings]

1 and 2 are block diagrams of a conventional positioning device, and FIG. 3 is a block diagram of a positioning device according to the present invention. 1 ... Object, 2, 3 ... Guiding piece, 4, 5, 6, 9, 10 ...
… Sliding pieces, 7, 8… Planes and arcs that indicate the sliding direction,
9a, 10a ... Contactors.

Claims (1)

[Claims] 1. A two guide piece having a guide surface for restricting the position and direction of two sides of a polygonal object having a projected shape of four or more sides, and another object not in contact with the guide surface. A positioning device comprising: a plurality of sliding pieces that press two or more sides with a pressing force having a component force parallel to the guide surfaces and directed in the direction of the line of intersection of the two guide surfaces.