JP3558754B2 - Reference plane setting device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reference plane setting apparatus used for surveying and the like, and more particularly to a reference plane setting apparatus that is hardly broken even when a vertical impact is applied to the reference plane setting apparatus.
[0002]
[Prior art]
As a conventional reference plane setting device, there is a device in which a so-called ball joint is directly mounted in a housing of the device, and a rotary driving body is supported swingably via the ball bearing. In this device, the rotary driving body is always pressed against the tip of the adjusting screw by the biasing means, and by rotating the adjusting screw to advance and retreat the position of the distal end of the adjusting screw, the rotational axis direction of the rotary driving body is set to be vertical. It can be turned in the direction.
[0003]
[Problems to be solved by the invention]
By the way, when the reference plane setting device having the above configuration is accidentally dropped or the like and a shock is applied to the device in a lateral direction, that is, in a swinging direction of the rotary driving body, the rotary driving body is moved against the adjusting screw. The impact in the swinging direction is absorbed by the swinging of the rotary driving body because it is merely pressed by the urging means and is not fixed, but the impact in the direction of the rotating axis is directly transmitted to the ball joint. Since the ball joint cannot be absorbed, the ball part of the ball joint may be broken, the ball part may fall off from the ball receiving part, or the peripheral part of the ball joint may be damaged.
[0004]
In view of the above problems, an object of the present invention is to provide a reference plane setting device that is not easily broken by a vertical impact.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a rotary driving unit including a light irradiation unit, a shaft supporting the light irradiation unit rotatably, and a driving unit for rotating the light irradiation unit, via a ball joint. A reference surface that is swingably supported in the housing and that irradiates irradiation light from the light irradiating means while rotating the light irradiating means, thereby setting a reference plane perpendicular to the rotation axis of the light irradiating means. In the setting device, a ball joint is attached to the inside of the housing via a shock absorbing means capable of absorbing a shock in the rotation axis direction of the rotary driver, and the rotary driver is swingably supported by the ball joint. It is characterized by:
[0006]
In the conventional reference plane setting device, when an impact in the rotation axis direction of the light irradiation means is applied to the housing, the impact is directly transmitted to the ball joint. However, as in the present invention, the impact is attached to the housing and the housing. When the buffer means is interposed between the ball joints, the shock in the rotation axis direction is absorbed by the buffer means, so that the shock transmitted to the ball joint and the like is reduced, and the members such as the ball joint are prevented from being broken. The cushioning means may be constituted by, for example, an elastically deformable frame supporting the rotary driving body via a ball joint, or constituted by a cushioning material interposed between the bottom surface in the housing and the frame. You may.
[0007]
The pivot supporting the light irradiating means is housed in a frame inside the housing, but as a means for adjusting the rotation axis direction of the light irradiating means, an adjusting screw which can be adjusted from outside the housing, or When the automatic leveling mechanism is provided, the adjustment work becomes easy. Further, in the above invention in which the frame is provided in the housing, the frame has low support rigidity, so the frame may vibrate and the reference surface may be shaken. However, when the vibration isolating material is interposed, the vibration of the frame is prevented. You.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIG. 1, reference numeral 1 denotes a housing which is a main body of the reference plane setting device. The housing 1 accommodates an elastically deformable frame 2, and the bottom of the frame 2 is attached to the housing 1. The rotary driving body 4 was swingably supported in the frame 2 via a ball joint 3. The rotation driving body 4 includes a shaft support 5 directly connected to the ball joint 3, and a light irradiation unit 6 described later rotatably fitted into a hollow portion of the shaft support 5 via a bearing 5 a. A driving unit 7, which is attached to the shaft support 5 via a stay and drives the light irradiation unit 6, is described later. The light irradiating means 6 is fixed to the upper end of the rotating shaft 6a so as to be rotatably inserted into the hollow portion of the shaft support 5 via a bearing 5a, and to be located at the upper part of the housing 1. And a light emitting means 6c attached to the lower end of the rotating shaft 6a. The driving means 7 includes a motor 7a attached to the outer portion of the shaft support 5 via a stay, It is composed of an output shaft 7b of a motor 7a and a belt 7d hung on a pulley 7c of a rotating shaft 6a.
[0009]
As shown in the figure, a seating surface 1a is formed at the bottom in the housing 1, and through holes 1b, 1b penetrating the housing 1 are formed in the seating surface 1a. The frame 2 is mounted on the seating surface 1a, and is fixed to the housing 1 by bolts 8, 8 screwed to the frame 2 from the outside of the housing 1 through the through holes 1b, 1b. Have been. The ball joint 3 extends downward from the upper surface of the frame 2 and includes a spherical rod-shaped projection 3a having a spherical tip and a hollow spherical ball receiving portion 3b formed at the upper end of the shaft support 4. By fitting the tip of the rod-shaped projection 3a to the ball receiving portion 3b as a so-called ball pair, the pivot support 4 can be swung with respect to the frame 2. When the shaft support 4 is thus supported, the vertical shock applied to the housing 1 is absorbed by the elastic deformation of the frame 2, and the shock applied to the ball joint 3 is reduced.
[0010]
Each of the housing 1 and the frame 2 of the embodiment has a substantially rectangular parallelepiped shape. As shown in FIG. 2, one of two adjacent side surfaces of the frame 2 is perpendicular to the side surface. A screw hole 2b extending in a different direction is formed, and a screw hole 2c extending in a direction perpendicular to the side surface is formed in the other side surface, and a leveling screw 9 is screwed into each of the screw holes 2b and 2c. Then, the shaft support 4 was brought into contact with the leveling screws 9, 9 by the springs 10 provided in the frame 2. Therefore, by adjusting the amount of screwing of the leveling screws 9 into the frame 2, the inclination of the shaft support 5 can be changed, and the inclination of the axis 6s of the rotating shaft 6a can be adjusted. it can. In the illustrated example, through holes 1c, 1c are formed in the housing 1 so that the screwing amounts of the leveling screws 9, 9 can be operated from outside the housing 1.
[0011]
The rotating shaft 6a has a hollow cylindrical shape, and guides light from the light emitting means 6c to the rotating head 6b through a light guide path 6d formed of a hollow portion of the rotating shaft 6a. The rotary head 6b incorporates an optical system (not shown) for reflecting light from the light emitting means 6c and irradiating the light from the irradiation hole 6e on the peripheral side of the rotation head 6b to the outside. Irradiation light is emitted in a direction orthogonal to the axis 6s of 6. When the motor 7a is operated, the rotary head 6b rotates to rotate the irradiation direction of the irradiation light. In the illustrated example, the inside of the housing 1 is dust-proof by covering the rotary head 6b with a cover 11 having a transparent side.
[0012]
In the embodiment shown in FIG. 3, the direction of the axis 6 s is adjusted by the automatic leveling mechanism 20 instead of the leveling screws 9. The automatic leveling mechanism 20 includes a leveling nut 20a mounted on the shaft support 5, a screw 20b screwed to the nut 20a, and a leveling motor mounted on the frame 2 and rotating the screw 20b. 20c, an inclination sensor 20d as means for detecting the inclination of the rotating shaft 6a, and a control unit 20e for controlling the motor 7a based on a signal from the inclination sensor 20d. Thus, the motor 20c is controlled by the control unit 20e to change the inclination of the shaft support 5 so that the axis 6s of the rotating shaft can be directed in the vertical direction.
[0013]
FIG. 4 shows a case in which a shock absorbing rubber 30 is provided between the housing 1 and the frame 2 as a cushioning material. With this configuration, the shock in the vertical direction is absorbed by the shock absorbing rubber 30, and the shock transmitted to the ball joint 3 and the like is reduced. Further, as shown in FIG. 5, a disc spring 40 may be used as a cushioning material to absorb a vertical shock. By the way, in each of the above embodiments, since the holding rigidity of the frame 2 is low, the frame 2 may be vibrated. In this case, as shown in FIG. 6, when the vibration isolating rubber 50 as the vibration isolating means is interposed between the housing 1 and the frame 2, the vibration of the frame 2 in the housing 1 is prevented. In addition, the vibration isolating means is not limited to the illustrated example, and includes, for example, a vibration isolating rubber inserted between the housing and the rotary driving body 4 and a vibration isolating rubber holding a member supporting the ball joint. May be used.
[0014]
In each of the above-described embodiments, the inside of the housing 1 is protected from dust by covering the rotary head 6b with the transparent cover 11 at least on the side. However, as shown in FIG. The inside of the housing 1 may be protected from dust by attaching the sealing material 60 to the housing 1. Further, in each of the above embodiments, the ball joint 3 is supported by the frame 2, but the ball joint 3 may be supported by the housing 1 via a buffer such as a spring without using the frame 2. . Further, the reference plane setting device of each of the above embodiments can be used not only for setting a horizontal plane but also for setting a vertical plane.
[0015]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a reference plane setting device that is not easily damaged by a vertical impact.
[Brief description of the drawings]
FIG. 1 is a cutaway side view showing a first embodiment of the present invention. FIG. 2 is a cutaway plan view showing a II-II cross section of FIG. 1. FIG. 3 is a cutaway side view showing a second embodiment of the present invention. 4 is a cutaway side view showing a third embodiment of the present invention. FIG. 5 is a cutaway side view showing a fourth embodiment of the present invention. FIG. 6 is a cutaway side view showing a fifth embodiment of the present invention. Cutaway side view showing main parts of a sixth embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Housing 2 Frame 3 Ball joint 5 Shaft support 6a Rotating shaft 6b Rotating head 7a Motor 9 Leveling screw 10 Spring 20 Automatic leveling mechanism 30 Shock absorbing rubber 40 Disc spring 50 Anti-vibration rubber 60 Sealing material

Claims (6)

A rotation driving body including a light irradiation unit, a shaft support rotatably supporting the light irradiation unit, and a driving unit for rotating the light irradiation unit is swingably supported in the housing via a ball joint, In a reference plane setting device that sets a reference plane perpendicular to a rotation axis of the light irradiation unit by irradiating irradiation light from the light irradiation unit while rotating the light irradiation unit, inside the housing, A reference plane setting device, wherein a ball joint is mounted via a buffer means capable of absorbing a shock in a rotation axis direction of the rotary driver, and the rotary driver is swingably supported by the ball joint. The shock-absorbing means is an elastically deformable frame that is housed inside the housing and supported on the bottom surface of the housing, and is swingably movable inside the frame via the ball joint. The reference plane setting device according to claim 1, wherein the reference plane setting device accommodates a rotary driving body. The buffer means is an elastically deformable resilient member inserted between the housing and the bottom surface of the frame housed in the housing, and swings via a ball joint attached inside the frame. The reference plane setting device according to claim 1, wherein the rotation driving body is freely supported. An adjusting screw capable of adjusting the screwing amount from the outside of the housing and an urging means for urging the tip of the adjusting screw so as to always contact the rotary driving body are attached, and the rotational drive is performed from outside the housing. 4. The reference plane setting device according to claim 1, wherein the inclination of the body is adjustable. 4. An apparatus according to claim 1, further comprising means for detecting a tilt of the rotary driver, and an automatic leveling mechanism for changing the tilt of the rotary driver based on the detected tilt state. The reference plane setting device described in Crab. The reference plane setting device according to any one of claims 1 to 5, further comprising an anti-vibration means for preventing vibration of the rotary driving body.

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