JPH1089926A - Dimension measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the dimension of a sample material with rapidity and high precision by displaying the magnified sampled material on a magnifying display mechanism, and aligning the magnified sample with an alignment reference. SOLUTION: A projection image of a work W transmitted through a magnifying lens 34 is displayed on a projection screen 36. On the projection screen 36, the first and second reference lines 38a and 38b, orthogonal to each other, are formed as alignment reference for aligning the magnified work W. A length measuring mechanism 18 is composed of, for example, an electronic scale utilizing a magnetic scale, and provided with a straight measure 40, which is fixed to a pedestal member 14, and a counter indicating part 42 which is fixed to a lifting stage 22 and moves along the straight measure 40 to indicate the movement distance of itself. Only by detecting the upper end surface of a jig 50, in advance, with a magnifying display mechanism 16 and, at this height position, setting the counter indicating part 42 at '0', the height of the work W is measured and indicated with ease and precision based on the movement distance of the magnifying display mechanism 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dimension measuring device for measuring dimensions such as height and length of an object to be measured.

[0002]

2. Description of the Related Art Conventionally, a height gauge has been widely used for measuring a dimension, for example, a height of an object to be measured. Height gauge, specifically, after placing the object to be measured on the surface plate, raise and lower the scriber along the main scale, adjust the tip of the scriber to a predetermined portion of the object to be measured,
The height position is measured by reading the height position with a vernier.

However, this type of height gauge has a disadvantage that a measurement error is likely to occur because the tip of the scriber is visually adjusted to a predetermined position of an object to be measured. In addition, since a measurement value is obtained from the scale of the main scale and the vernier, a reading error due to visual observation is easily caused.

Therefore, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2-10101, light from a light source in a projector is irradiated on an object to be measured having a surface substantially parallel to the optical axis, thereby obtaining the light. There is known a method in which a projection image is enlarged by a projection lens and projected on a screen, and the dimensions, angles, and the like of each part of the projection image on the screen are measured. According to this, since a projected image of a minute object to be measured is enlarged and projected on a screen, the dimensions of each part of the projected image can be accurately obtained.

[0005]

However, in the above prior art, the size of each part of the projected image magnified on the screen is actually measured, and this measured value is divided by the magnification of the projection lens to obtain the object to be measured. You are getting the actual dimensions. For this reason, an error at the time of actual measurement on the screen is likely to occur. In addition, it has been pointed out that since the calculation is performed in consideration of the magnification of the projection lens, the measurement accuracy is reduced due to an error in the optical system itself, and the measurement operation is complicated.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a dimension measuring device capable of quickly and accurately measuring the dimension of an object to be measured.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention enlarges and displays an object to be measured on an enlarged display mechanism, and positions the enlarged object to be measured based on an alignment standard. Thereby, the positioning error is reduced as much as possible.

Further, when the magnifying display mechanism is displaced in the measuring direction of the object to be measured, the length measuring mechanism is displaced integrally with the magnifying display mechanism to display the moving distance of the magnifying display mechanism.
Thus, the size of the object to be measured is displayed on the length measuring mechanism only by performing the operation of positioning a desired portion of the object to be measured with the alignment reference of the enlarged display mechanism, and the dimension measuring operation of the object to be measured can be performed. Performed quickly and accurately.

The magnifying display mechanism is configured to magnify and display an image of the measured object on a projection screen by a magnifying lens arranged on the optical axis of the light projecting means. Therefore, the structure of the enlarged display mechanism is effectively simplified.

[0010]

FIG. 1 is an explanatory perspective view of a dimension measuring apparatus 10 according to an embodiment of the present invention.

The dimension measuring device 10 has a base member 14 mounted on a surface plate 12. The base member 14 has an enlarged display mechanism 16 for enlarging and displaying the work W as an object to be measured, and a length measuring mechanism for measuring and displaying the dimension of the work W from the moving distance of the enlarged display mechanism 16. 18 are integrally supported so as to be able to advance and retreat in a vertical direction (the direction of the arrow X) which is the measurement direction of the work W.

A rack member 20 is fixed to the base member 14 so as to be vertically oriented, and an elevating table 22 is supported by the rack member 20. The elevating table 22 is provided with a screw shaft (not shown) that meshes with the rack member 20, and a handle 24 is fixed to one end of the screw shaft.

A support rod 26 is fixed to the lift 22 so as to extend in the horizontal direction, and a light-emitting lamp (light-emitter) constituting the magnifying display mechanism 16 is provided at one end of the support rod 26 via a fixture 28. (Means) 30 is mounted. The optical axis O of the floodlight 30 is indicated by an arrow Y orthogonal to an arrow X direction which is a measurement direction.
Direction (horizontal direction). The main body 32 of the magnifying display mechanism 16 is attached to the other end of the support rod 26, and a magnifying lens 34 for projection is disposed below the main body 32 on the optical axis O of the floodlight 30. Is established. Body 3
A projection screen 36 is provided on the upper side of 2, and a projection image of the work W transmitted through the magnifying lens 34 is enlarged and displayed on the projection screen 36. Although not shown, a reflection mirror for guiding a projected image from the magnifying lens 34 to the projection screen 36 is provided in the main body 32.

On the projection screen 36, first and second reference lines 38a and 38b orthogonal to each other are formed as alignment references for aligning the enlarged work W. The first and second reference lines 38a and 38b can be arranged at any angle by rotating the projection screen 36.

The length measuring mechanism 18 is composed of, for example, an electronic scale using a magnetic scale.
4 includes a straight scale 40 fixed to the direction of the arrow X, and a counter display unit 42 fixed to the lift 22 and moving along the straight scale 40 to display the moving distance.

The operation of the dimension measuring apparatus 10 configured as described above will be described below.

First, as shown in FIG. 2, a cylindrical jig 50 for mounting the work W on the surface plate 12 is mounted.
Then, the handle 24 is rotated in a predetermined direction to displace the lifting platform 22 in the direction of the arrow X, and the enlarged display mechanism 16 is arranged corresponding to the upper end surface 50 a of the jig 50.

At this time, the projection lamp 30 is energized to derive the illumination light L in the horizontal direction (the direction of the arrow Y). The illumination light L is applied to the jig 50 and reaches the magnifying lens 34. The magnifying lens forms an enlarged projection image near the upper end surface 50a of the jig 50 on the projection screen 36, and the enlarged image of the jig 50 is displayed on the projection screen 36. Then, the elevator 22 is stopped at a position where the upper end surface 50a of the jig 50 coincides with the first reference line 38a of the screen 36, and the counter display unit 42 constituting the length measuring mechanism 18 is set to “0”. Thereby, the length measuring mechanism 18 sets the upper end surface 50a of the jig 50 to the “0” position.

Next, with the work W placed on the jig 50, the elevating table 22 moves the base member 14 upward along the rack member 20 via the handle 24. For this reason, the enlarged display mechanism 16 and the length measuring mechanism 18 move up integrally, and the projection screen 3 constituting the enlarged display mechanism 16
6, an enlarged image of the work W is sequentially displayed from the lower side to the upper side of the work W. On the other hand, the moving distance of the magnifying display mechanism 16 is displayed on the counter display section 42 constituting the length measuring mechanism 18.

Here, when measuring the height from the bottom surface Wa of the work W to the R-plane intersection Wb, the rotation of the handle 24 causes the R-plane intersection Wb of the work W to be displayed on the projection screen 36. Is lifted until is displayed. Then, as shown in FIG. 4, the outer diameter line Wc of the small-diameter portion of the work W matches the second reference line 38 b in the projection screen 36, and the R-plane intersection Wb changes to the first reference line 38.
The elevator 22 is moved upward to a height position corresponding to the intersection of the first reference line 38a with the second reference line 38b. The dimension displayed on the counter display section 42 at this height position is the height from the bottom surface Wa of the workpiece W to the R-plane intersection Wb.

As described above, in the present embodiment, the magnifying display mechanism 16 for enlarging and displaying the work W on the projection screen 36 and the counter display section 42 constituting the length measuring mechanism 18 for displaying the dimensions of the work W. Are configured to be able to move forward and backward in the direction of the arrow X integrally via the lifting table 22. For this reason, the upper end surface 50a of the jig 50 is previously displayed on the enlarged display mechanism 1.
6, the height of the workpiece W is easily and accurately measured from the moving distance of the enlarged display mechanism 16 and displayed by simply setting the counter display section 42 to "0" at the height position. can do.

Accordingly, the first screen on the projection screen 36 is
By simply aligning the second reference lines 38a and 38b in correspondence with a predetermined portion of the workpiece W, for example, the R-plane intersection Wb, the height up to the R-plane intersection Wb is quickly and accurately measured. The effect that it becomes possible to obtain is obtained.

The dimension measuring device 10 according to the present embodiment
Thus, even if the work has a complicated shape in which a scriber used in a conventional height gauge cannot be inserted, the dimension can be reliably measured. For example, as shown in FIG. 5, when measuring the size of the work W ′ having the saw-tooth surface 60, the first and second reference lines 38a corresponding to the desired surface of the saw-tooth surface 60 are measured. , 38b,
The work of measuring the height of the work W 'can be efficiently and accurately performed.

[0024]

As described above, in the dimension measuring device according to the present invention, when the enlarged display mechanism is moved along the measuring direction of the object to be measured, the length measuring mechanism moves integrally with the enlarged display mechanism. . For this reason, the dimension of the measured object can be displayed on the length measuring mechanism only by adjusting the alignment criterion of the enlarged display mechanism to a desired portion of the enlarged measured object. As a result, the dimensions of the object to be measured can be measured quickly and with high accuracy with an extremely simple operation, and the efficiency of the entire measurement operation is effectively improved.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a dimension measuring device according to an embodiment of the present invention.

FIG. 2 is an explanatory side view when a jig upper surface position is detected by the dimension measuring device.

FIG. 3 is an explanatory side view when the height of a work to a predetermined portion is measured by the dimension measuring device.

FIG. 4 is an explanatory front view of a projection screen constituting the dimension measuring device.

FIG. 5 is an explanatory diagram of a state where a work having a complicated shape is displayed on the projection screen.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Dimension measuring device 14 ... Base member 16 ... Enlargement display mechanism 18 ... Length measuring mechanism 22 ... Elevating table 30 ... Floodlight 32 ... Body part 34 ... Magnifying lens 36 ... Projection screen 38a, 38
b: Reference line 40: Straight line 42: Counter display unit 50: Jig

Continuation of front page (72) Inventor Kotaro Arai 8-1, Honcho, Wako-shi, Saitama Pref. Honda Motor Co., Ltd.

Claims (2)

[Claims] An enlarged display mechanism provided with an alignment reference for positioning the enlarged DUT and positioning the enlarged DUT; measuring the DUT with the enlarged display mechanism; A base member that supports the main body so as to be able to advance and retreat along a direction; and a main body that advances and retreats along the measurement direction integrally with the magnifying display mechanism, and measures and displays a dimension of the object to be measured from a moving distance of the magnifying display mechanism A length measuring mechanism, comprising: 2. The apparatus according to claim 1, wherein the magnifying display mechanism is configured to emit light to the object to be measured in a direction intersecting the measurement direction, and a light emitted from the light emitting means. A dimension measuring device, comprising: a projection magnifying lens arranged on an axis; and a projection screen for displaying an image of an object to be measured enlarged by the magnifying lens.