JPH0729517Y2 - Direction changer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a device for changing the direction of a direction-changeable object.

<Prior Art> For example, a measuring instrument having directionality such as a microprobe for acoustic intensity (AI) measurement is
Without changing the position of the measurement point, change its direction to X, Y,
It is necessary to change to Z. In order to change this direction, conventionally, a measuring instrument was attached to the tip of the arm and the proximal side was operated.

<Problems to be Solved by the Invention> However, according to this conventional technique, it was difficult to accurately change the direction of the measuring device with the measuring point fixed. Also, depending on the mutual relationship between the arm and the measuring instrument,
The presence of the arm interfered with the measuring instrument, sometimes resulting in inaccurate measurements.

<Means for Solving the Problems> The present invention has an object of providing a direction changing device capable of solving the above problems, and has a rotating shaft and a supporting arm integral with the rotating shaft. A measuring instrument having directivity is attached to the tip of the support arm and on an extension line of the center of rotation of the rotary shaft, and the angle θ formed between the direction of the measuring instrument and the center of rotation of the rotary shaft is Is characterized in that.

According to a preferred aspect of the present invention, the supporting arm is integrally formed with the measuring instrument and extends in the direction thereof, and the first arm is fastened at a right angle to the first arm and the base end of which is integral with the rotating shaft. The first arm is slidably fastened to the second arm in the direction of the measuring device.

<Action> The angle between the direction of the measuring instrument and the center of rotation of the rotary shaft is Therefore, by providing the center of rotation of the rotating shaft so as to coincide with the three-dimensional diagonal line of the cube, the direction of the measuring instrument can be made to coincide with one side of the regular cube. Therefore, by rotating the rotation axis by 120 degrees from a certain angular position, the direction of the measuring instrument is made to coincide with one side next to the regular cube, that is, the direction of the measuring instrument is stereoscopically 90 degrees, in other words, three-dimensional. Changes in the X, Y, Z directions of Cartesian coordinates.

Further, by making the first arm of the support arm slidable with respect to the second arm, it becomes easy to position the measurement point on the extension line of the rotation axis when various measuring instruments are replaced,
The supporting arm does not impair the directionality of the measuring instrument.

<Embodiment> A direction changing device 1 according to an embodiment of the present invention includes a rotating shaft 2,
It has a support arm 3 integrated with the rotary shaft 2 and a measuring device 4 attached to the tip of the support arm 3. The rotary shaft 2 is rotatably supported by a bearing 2b around its rotation center 2a. The support arm 3 has a first arm 3a having a measuring instrument 4 attached to the tip thereof, and is attached at one end thereof at a right angle to the other end of the first arm and at the other end 3c thereof in the vicinity of the tip of the rotary shaft 2. Second arm 3b which is fixedly fixed and extends obliquely from the rotary shaft 2. The measuring device 4 attached to the tip of the first arm 3a is, in the present embodiment, the well-known AI measuring microprobe as described above, and the spacer 4b.
Two microphones are arranged so as to face each other.

Here, regarding the positional relationship among the rotary shaft 2, the support arm 3 and the measuring device 4, the measuring point of the measuring device 4 is arranged on the extension line of the rotation center 2a of the rotating shaft 2, and the measuring point is O When the intersection of the center of rotation 2a and the center line of the second support arm 3b is P, and the intersection of the center line of the second support arm 3b and the direction line 4a of the measuring instrument 4 is Q,
As shown in Fig. 2, the line segment OQ forms one side of a cube,
The line segment QP forms a diagonal line on one side surface of the regular cube, and the line segment OP forms a diagonal line on the regular cube. That is, if the length of one side of the cube is l, then OQ = 1, PQ = √2l, OP = √3l, and therefore the angle POQ or θ is Becomes

In FIG. 1, the first support arm 3a is slidably attached to the second support arm 3b. This is the second support arm
This is achieved by fixing the sleeve 5 in which the first support arm 3a is loosely fitted to the tip of 3b, inserting the first support arm 3a in the sleeve, and then tightening the screws 6 in place.

In the embodiment shown in FIG. 1, the second arm 3b and the first arm 3a are shown in a state of being orthogonal to each other. However, even if they are crossed diagonally as indicated by a chain double-dashed line in FIG. It is clear that it can work.

<Effect of the Invention> In the direction changing device according to the present invention, the angle between the direction of the measuring instrument and the rotation axis is Therefore, the direction of the measuring instrument can be three-dimensionally changed by 90 degrees by rotating the rotation axis by 120 degrees.

[Brief description of drawings]

Each of the drawings illustrates an embodiment of the present invention, FIG. 1 is an overall side view thereof, and FIG. 2 is a perspective view for explaining the operation. Explanation of symbols 1 ... Direction changing device, 2 ... Rotation axis, 2a ... Rotation center,
3 ... Support arm, 3a ... 1st arm, 3b ... 2nd arm, 3c ... Base end, 4 ... Measuring instrument, 4a ... Direction

Claims (2)

[Scope of utility model registration request] Claim: What is claimed is: 1. A measuring instrument having a rotating shaft and a supporting arm integral with the rotating shaft, the measuring instrument having directionality being attached to an end of the supporting arm and an extension line of a rotation center of the rotating shaft. The angle θ between the direction of the measuring instrument and the center of rotation of the rotary shaft is A direction changing device. 2. A support arm comprises a first arm which is integral with the measuring instrument and extends in that direction, and a second arm which is fastened at a right angle to the first arm and whose base end is integral with the rotary shaft. The direction changing device according to claim 1, wherein the first arm is fastened slidably to the second arm in the direction of the measuring device.