JPH0564749U - Three-dimensional center of gravity measuring device - Google Patents

Abstract

(57) [Summary] [Structure] A laser beam projecting body that supports an object to be swung in the x-axis direction around the x-axis, and includes a position on the x-axis and moves on a z-axis orthogonal thereto. A laser beam is emitted from the target to irradiate the subject, and a vertical line is directly written on the subject to specify the position of the center of gravity. [Effect] Although it is a simple device, it is easy to place the subject at the measurement position and the accuracy can be improved because it can be written directly on the subject.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an apparatus for measuring the position of the center of gravity of an object in a three-dimensional space consisting of x, y, and z axes.

[0002]

[Prior Art]

 In the case of parts that are required to be assembled in consideration of weight balance, such as parts mounted on aircraft, it is necessary to measure the three-dimensional center of gravity in advance and specify the position of the center of gravity on the part or on the drawing. In principle, the three-dimensional center of gravity is obtained by suspending an object to be measured (hereinafter referred to as the “subject”) at one point and obtaining a vertical line passing through the object from the suspended position, and then suspending it at another point. When the vertical line is obtained, the intersection point indicates the three-dimensional barycentric position of the subject.

Generally, as shown in FIG. 6, an arbitrary plane of the subject 100, that is, planes A, B, C, and D in FIG. 6 are selected as reference planes so as to facilitate measurement, and the reference planes are shown in the drawing. The yarns 102 and 104 are adjusted so that the plan view, the front view, or the side view, that is, the reference plane is perpendicular to the horizontal plane, and is suspended at two points D and E. At that time, the three-dimensional center-of-gravity position G of the subject is located in the plane of the vertical planes D, E, F, and H. Therefore, the center of gravity position G can be specified by obtaining another plane by such an operation, obtaining a line intersecting with the plane, and further obtaining an intersection from another plane. Therefore, the thread 108 with the weight 106 attached to the tip to draw the vertical line is positioned on the same axis (x-axis) line as the threads 102 and 104, and it is photographed by the camera 110 to copy the line DH on the photographic paper. .. Then, the same operation is performed from the other two points A and I to obtain the line AJ on the photographic printing paper, and the intersection G1 (two-dimensional barycentric position) is obtained. Since the lines G1 and G are perpendicular to the plane ABCD, if the object 100 is rotated 90 degrees and the second two-dimensional center-of-gravity position G2 is similarly measured from the y-axis direction, the three-dimensional center-of-gravity position G is shown in the drawing. Can be specified with.

However, according to such a method, it takes time until the shaking of the subject is stopped by wind, vibration, etc. and the subject stands still, and the fine adjustment of the yarns 102, 104 is required to vertically surfacing the reference plane. It is troublesome, and it is difficult for the subject to determine where to hang it. Further, when the weight distribution of the subject is extremely biased, the yarn 102 (104) does not slack and does not line up with the yarn 108. Therefore, the measurement was difficult. Furthermore, since the measurement is performed via photographic paper, the size of the image is reduced, and there is distortion of the lens of the camera, which is not sufficient in terms of accuracy.

Therefore, recently, as described in JP-A-63-98536, a technique for measuring a three-dimensional center of gravity by using three load sensors has been proposed.

[0006]

[Problems to be solved by the device]

 However, this proposed technique has a complicated structure in which three load sensors are used, and only the technique for measuring the three-dimensional center of gravity position is disclosed. Or, the technique of accurately specifying on the subject was not disclosed at all.

Therefore, an object of the present invention is to solve the above-mentioned problems, and it is possible to determine the three-dimensional center-of-gravity position regardless of the weight distribution of a subject, even though it is a relatively simple device. An object of the present invention is to provide a three-dimensional barycentric measuring device capable of measuring the barycentric position in a short time and accurately specifying the barycentric position on a subject or a drawing.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is, for example, as shown in claim 1, a device for measuring the three-dimensional barycentric position of an object, which is composed of x, y and z axes. Support means for swingably supporting the x-axis and the y-axis at opposite positions on the axis and the y-axis, and on the same axis as any one of the x-axis and the y-axis. And is arranged so as to be movable up and down in the z-axis (vertical) direction orthogonal to it, and also comprises a marking means for marking an arbitrary point or line in the z-axis direction on the surface of the object to be measured. Configured.

[0009]

[Action]

 Although it is a simple device, it is easy to place the subject at the measurement position and the accuracy can be improved because it can be written directly on the subject.

[0010]

【Example】

 An embodiment of a three-dimensional center of gravity measuring device according to the present invention will be described below with reference to the drawings. 1 is a perspective view of the apparatus, FIG. 2 is a top view thereof, FIG. 3 is a front view thereof, and FIG. 4 is a side view thereof. In the figure, a three-dimensional center-of-gravity measuring apparatus 10 according to the present invention is provided with a frame 12 in the shape of a stilt. Two rails 14, 14 are laid opposite to each other on the upper portion of the frame 12, and a slider 16 is attached along the rails 14 so as to be slidable in the x-axis direction. The slider 16 is provided with a protrusion 18, and a second protrusion 20 is provided at a position facing the protrusion 18 so as to protrude from the upper side 12 a of the frame 12. As shown in FIG. 1, the protrusions 18 and 20 are for holding the subject 100 between them. That is, as shown in FIG. 5, three sets of holes (pin points) 24 (K, K ', M, M) are formed on the subject 100 in advance on a lathe when the subject is manufactured, or on a surface plate thereafter. After processing, the position of the slider 16 is adjusted according to the size of the subject 100, and the projections 18 and 20 are inserted into the pin points 24 of the object 100 so as to support them from both sides. To configure. As a result, the subject 100 is clamped so as to be swingable around the x-axis.

Further, the upper side 12 a and the lower side 12 b of the frame 12 are projected outward in the vicinity of the protrusion 20 provided therebetween, and a pillar 26 is bridged in the up and down direction between them, and the pillar 26 is attached to the pillar 26. A laser light projecting body 28 is mounted so as to be slidable in the vertical direction (z axis). Here, one of the features is that the projections 18, 20 and the laser beam projecting body 28 are arranged on the same axis in the x-axis direction, as shown in FIG. To be precise, the tips of the protrusions 18 and 20 and the laser optical axis of the laser light projecting body 28 are arranged on the same axis in the x-axis direction. Further, the laser beam projecting body 28 is configured so that its laser optical axis includes the position on the x-axis line described above, and is movable in the z-axis direction orthogonal thereto, and is placed on the subject 100 as shown in FIG. It is designed to be able to mark points or lines by irradiating laser light. It should be noted that the amount of laser light emitted by the laser light projecting body is relatively weak, and a laser light projecting body that shows a position on the subject 100 is used. It is done by marking with markings. In the figure, reference numeral 32 indicates a stopper screw for fixing the slider 16. An adjuster 36 for leveling is provided at the bottom of the device.

Next, the measurement operation of this apparatus will be described.

First, as shown in FIG. 1, the subject 100 is supported between the protrusions 18 and 20. Referring to FIG. 5, specifically, in this case, the reference point, for example, the plane ABCD, is pinpointed in the pinpoint 24 so as to be accurately vertical (parallel to the z-axis direction) when supported by the apparatus. , K, K ′ are selected, the subject 100 is supported, and the vertical line L is measured. As described above, since the tip of the protrusion is inserted into and supported by the pin point 24 (K, K ′), the subject 100 can freely swing around the x-axis and does not require fine adjustment of the thread. The subject 100 immediately stops. Further, since the laser beam projecting body 28 is constructed so as to move up and down in the z-axis direction from the pin point supported as described above, the vertical line L starting from the position K can be easily designated, and the measurer Marks the vertical line L on the subject 100 based on it. Then, it is supported by a pair of M and M'of pinpoints 24, and a vertical line N is marked to obtain an intersection G1. Then, the subject is rotated by 90 degrees, supported by a set of O and O'of pinpoints 24 formed on the y-axis surface, and a vertical line P is obtained. Since the line Q connecting G1 and the barycentric position G is orthogonal to the reference plane (plane ABCD), the intersection G2 between the G1 and the line P can be obtained, and the barycentric position G can be calculated from the positions of the two-dimensional barycenters G1 and G2. Can be specified. Finally, the two-dimensional centers of gravity G1 and G2 are written in the drawing, and the process ends.

Since the present embodiment is configured as described above, there is almost no need to wait for the subject to stand still at the time of measurement, and it is no longer necessary to finely adjust the yarn for reference plane alignment, search for a hanging position, and the like. Therefore, the measurement time is significantly reduced. Further, even if the weight distribution of the subject is biased, it does not hinder the measurement, and the device is simpler than the technique described in Japanese Patent Laid-Open No. 63-98536 and the center of gravity is located on the subject. It can be written directly and can be immediately reflected in the drawing, greatly improving the accuracy. Moreover, since the laser light is used, it is possible to accurately indicate the required position on the subject.

In the above-described embodiment, the measurer marks the surface according to the projected laser light. However, a photosensitive agent is applied to the surface of the subject or a photosensitive paper is attached to the surface of the subject to perform automatic measurement. It may be marked as desired. The same processing may be performed using thermal transfer technology. Further, the amount of laser light may be increased to mark directly on the subject, and instead of laser light, ultraviolet irradiation, nozzle injection, or ball hitting may be used to make a mark.

[0016]

[Effect of the device]

 According to claim 1, which is a device for measuring a three-dimensional center-of-gravity position consisting of x, y, and z axes of an object, the measured object is located at a position opposite to each other on the x axis and the y axis. Supporting means for swingably supporting around the x-axis and the y-axis, and in the z-axis (vertical) direction on the same axis as any one of the x-axis and the y-axis. It is arranged so as to be movable up and down, and is composed of marking means for marking an arbitrary point or line in the z-axis direction on the surface of the object to be measured. Since the position of the center of gravity can be easily measured at the measurement position in a short time and the sample can be directly written on the object to be measured, the accuracy is improved.

In the apparatus according to the second aspect, since the marking means is configured to use the laser beam, the required position can be accurately indicated on the object to be measured.

[Brief description of drawings]

FIG. 1 is a perspective view of a three-dimensional center of gravity measuring device according to the present invention.

FIG. 2 is a top view of the device of FIG.

FIG. 3 is a front view of the apparatus shown in FIG.

FIG. 4 is a side view of the device of FIG.

FIG. 5 is an explanatory diagram showing a pinpoint position of a subject and a measurement operation.

FIG. 6 is an explanatory diagram showing a measurement operation of a conventional technique.

[Explanation of symbols]

 10 three-dimensional center of gravity measuring device 12 frame 16 slider 18, 20 protrusion 24 hole (pinpoint) 28 laser light projecting body

Claims (2)

[Scope of utility model registration request] 1. A device for measuring a three-dimensional center-of-gravity position of an object, which is composed of x-, y-, and z-axes, comprising: a. Supporting means for supporting the object to be measured swingably about the x-axis and the y-axis at opposite positions on the x-axis and the y-axis, and b. On the same axis as any one of the x-axis and the y-axis, the z-axis is arranged so as to be vertically movable in the z-axis (vertical) direction orthogonal thereto, and the z-axis is arranged on the surface of the object to be measured.
A three-dimensional center-of-gravity measuring device comprising: a marking means for marking an arbitrary point or line in the axial direction. 2. The three-dimensional center of gravity measuring device according to claim 1, wherein the marking means uses laser light.