JPH1030925A - Reference-plane setting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the accuracy of a reference-plane setting device by providing two flat plates, which are orthogonal to the compressing direction at the compressing parts of the actuator of a movable part. SOLUTION: Two flat plates 23 and 24 are attached to the lower end of a movable part 2. Rods 13a and 14a of actuatores 13 and 14 are in contact with the respective flat plates 23 and 24. Furthermore, a slant sensor 27 is attached to the movable part 2. When a reference-plane setting device 1 is installed at the specified position, the rods 13a and 14a are made to advance and retreat with respect to the rotary axial line of the movable part 2 by the signal of the slant sensor 27. When the vertical attitude is obtained, setting is performed with the state as the original point. When the X-Y directions and the slant angle are inputted from an input part, the rods 13a and 14a of the actuators 13 and 14 are made to advance or retreat at the specified positions, and the rotary axial line of the movable part 2 are inclined in a specified direction and at a specified angle. Then, the intended reference plane is set by the laser light illuminated from an illuminating window 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for automatically setting a reference plane having an arbitrary inclination angle by irradiating light in a direction perpendicular to a rotation axis.

[0002]

2. Description of the Related Art As a conventional apparatus of this type, for example, Japanese Patent Laid-Open Publication No. Hei 6-313713 discloses a rotary shaft provided with an irradiating section at its tip for irradiating light in a direction perpendicular to the rotational axis. The movable part which is rotatably mounted on the housing is tiltably mounted in the housing via a ball joint, and abuts the outer peripheral surface of the cylindrical body of the movable part from two directions perpendicular to each other to manually adjust the inclination angle of the movable part. A movable part is provided between the movable part and the housing in a direction passing through the rotation axis in a predetermined state, and a spring for pressing the movable part against both the adjustable screws is provided. Are known. In this apparatus, two bubble tubes are attached to the movable part in a direction that is horizontal and perpendicular to each other. Turn the adjustment screw while looking at the bubble tube to adjust the rotation axis to be vertical. Do.

[0003]

In the above-mentioned conventional apparatus, a horizontal reference plane having an inclination angle of 0 degrees is manually set. However, since a reference plane having an arbitrary inclination angle is set automatically and automatically, the adjustment is performed. In some cases, screws are replaced with actuators. However, simply replacing the adjusting screw with an actuator would cause the tip of the actuator to abut the outer peripheral surface of the curved cylindrical body, and the relationship between the amount of advance and retreat of the actuator and the angle of inclination of the rotation axis would be complicated, and the actuator would become complex. Control becomes extremely complicated. Further, in the conventional device, a spring is provided in a direction in which the movable portion passes through the rotation axis in a predetermined state. Therefore, when the movable portion deviates from the predetermined state, a moment is generated in the cylindrical body by the urging force of the spring. When the moment is generated in this way, the movable portion moves due to the backlash of the ball joint, causing a problem that the inclination angle of the reference plane is shifted.
Since the directions of the moments are opposite to each other depending on the direction of deviation from the predetermined state, it is difficult to correct the moment.

[0004] In view of the above problems, an object of the present invention is to provide a reference plane setting apparatus free from such a problem.

[0005]

In order to solve the above-mentioned problems, the present invention provides a rotating shaft provided at an end with an irradiating portion for irradiating light in a direction perpendicular to the rotating axis, inside the cylindrical body. A movable part which is movably supported in a housing via a ball joint so as to be tiltable, and which comes into contact with the movable part from two directions perpendicular to each other to adjust the inclination angle of the movable part; A reference plane setting device having a spring which is provided between the housing and the housing and presses the movable portion against both actuators, wherein a flat portion perpendicular to the pressing direction is formed on a portion of the movable portion pressed by the actuator. It is characterized by having been provided.

[0006] Further, a movable portion having a rotating shaft provided at an end thereof for irradiating light in a direction perpendicular to the rotating axis line and rotatably mounted inside the cylindrical body is rotatably mounted in the housing via a ball joint. And an adjustable actuator that contacts the movable part from two directions perpendicular to each other and adjusts the inclination angle of the movable part, and a movable part that is installed between the movable part and the housing and pushes the movable part to both actuators. In a reference plane setting device provided with a spring to be brought into contact, a bar-shaped contact portion parallel to the advancing and retreating direction of the other actuator is provided at the tip of each actuator.

Here, the above-mentioned spring is characterized in that it is provided on the cylindrical body so as to be deviated so that a moment about the rotation axis always occurs in the same direction.

If the portion where the actuator contacts the movable portion is not a curved surface but a flat surface, the relationship of the change in the tilt angle of the movable portion with respect to the operation amount of the actuator does not change regardless of the tilt angle of the movable portion. Conversely, even if the movable portion side is a curved surface, if a rod-shaped contact portion is provided at the tip of the actuator, the relationship between the actuation amount of the actuator and the change in the inclination angle of the movable portion does not change.

By the way, when a moment in the same direction is always applied to the cylindrical body, the members constituting the ball joint are always pressed against one side, and the play of the ball joint is eliminated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a reference plane setting device, in which a movable portion 2 is provided inside a housing 11. A flange 21 is attached to the movable portion 2, and a back surface of the flange 21 is engaged with a hook 12 protruding from an inner surface of the housing 11. The tip of the hook 12 is formed into a ball shape, and engages with a spherical concave portion formed on the back surface of the flange 21 to form a ball joint J.
Further, two flat plates 23 and 24 are attached to the lower end of the movable portion 2. The rods 13a and 14a of the actuators 13 and 14 are in contact with the flat plates 23 and 24, respectively. Each of the rods 13a and 14a is capable of moving forward and backward in two directions perpendicular to each other, and abuts against the flat plates 23 and 24 at right angles. A pin 2 provided near the middle of the outer peripheral surface of the movable portion 2 so that the flat plates 23 and 24 always contact the rods 13a and 14a.
The spring 5 was provided between the housing 5 and the stay 15 projecting from the housing 11.

As shown in FIG. 2, the movable part 2 is a cylindrical body 22.
A hollow rotary shaft 31 is rotatably supported via a pair of upper and lower bearings, and laser light generated by a light emitting unit 32 provided below the rotary shaft 31 is rotated by the rotary shaft 31.
To the rotating head 3 attached to the upper end of the head. Rotating head 3
Is provided with an irradiation window 33 for irradiating the laser beam from the light emitting section 32 in a direction perpendicular to the rotation axis. The motor 4 is suspended from the flange 21. When the motor 4 is operated, the rotary head 3 rotates together with the rotary shaft 31 via the belt 41. Then, a reference plane is defined by the laser light emitted from the irradiation window 33. Since the reference plane is a plane perpendicular to the rotation axis, a reference plane having an arbitrary inclination angle can be defined by changing the inclination of the rotation axis.

The rods 1 of the actuators 13 and 14
When the plates 3a and 14a are advanced and retracted, the flat plates 23 and 24 always contact the tips of the rods 13a and 14a by the action of the spring 5, so that the inclination of the rotation axis can be adjusted by the advance and retreat of the rods 13a and 14a. In the present invention, as shown in FIG. 3, the erection direction F of the spring 5 is deviated so as not to pass through the rotation center (position of the rotation axis) C. Thereby, a moment M in the illustrated direction always acts on the movable portion 2. In addition, the claw piece 26 is protruded upward from the flange 21, and as shown in FIG. 4, the claw piece 26 is brought into contact with the stopper 16 fixed to the housing 11. When the moment M acts while the claw piece 26 is in contact with the stopper 16, the concave portion of the flange 21 is always pressed in one direction against the tip of the hook 12 constituting the ball joint J, and the gap between the tip of the hook 12 and the recess is formed. Even if there is some gap between them, there is no play of the ball joint J.
Reference numeral 17 denotes a guard for preventing the movable portion 2 from moving significantly due to vibration during transport.

A tilt sensor 27 is attached to the movable part 2. When the reference plane setting device 1 is installed at a predetermined location, first, a signal from the tilt sensor 27 causes the rotation axis of the movable part 2 to be vertical. Actuators 13 and 14
Rods 13a and 14a move forward and backward. When the rotation axis is vertical, the state is set as the origin. Next, XY
When the direction and the inclination angle are input from an input unit (not shown), the rods 13a and 14a of the actuators 13 and 14 are input.
To a predetermined position, and the rotation axis of the movable part 2 is inclined in a predetermined direction and a predetermined angle. Then, as described above, a desired reference plane is set by the laser beam irradiated from the irradiation window 33.

In the above-described embodiment, the flat plates 23 and 24 are attached to the movable portion 2. However, the outer peripheral surface of the tubular body 22 is cut out to provide a flat portion, and the rod 13a
The tip of 4a may be contacted. In addition, as shown in FIG. 5, a rod-shaped contact portion 14b parallel to the forward and backward direction of the rod 14a is attached to the distal end of the rod 13a, and the forward and backward direction of the rod 13a is similarly attached to the distal end of the rod 14a. You may make it attach the parallel contact part 13b.

The position of the rods 13a and 14a is controlled by a control unit (not shown) having a built-in microcomputer.
The control section may be built in the housing 11 or may be provided separately from the housing 11.

[0016]

As is apparent from the above description, the present invention can improve the accuracy of a reference plane setting device for automatically setting a reference plane having a desired inclination angle.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a sectional view showing a structure of a movable unit.

FIG. 3 is a sectional view taken along the line III-III.

FIG. 4 is a view as seen from an arrow IV.

FIG. 5 is a partial view showing a configuration of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reference plane setting device 2 Movable part 3 Rotating head 4 Motor 5 Spring

Claims (3)

[Claims] 1. A movable portion having a rotating shaft provided at an end thereof for irradiating light in a direction perpendicular to a rotating axis line at a front end thereof and rotatably supported inside a cylindrical body through a ball joint. And an adjustable actuator that contacts the movable part from two directions perpendicular to each other and adjusts the inclination angle of the movable part, and a movable part that is installed between the movable part and the housing and pushes the movable part to both actuators. A reference plane setting device, comprising: a spring to be brought into contact with the reference plane setting device, wherein a plane portion perpendicular to a pressing direction is provided in a portion of the movable portion pressed by an actuator. 2. A movable section having a rotating shaft provided at an end thereof for irradiating light in a direction perpendicular to the rotation axis and having a rotating shaft rotatably mounted inside a cylindrical body, is provided in a housing via a ball joint. And an adjustable actuator that contacts the movable part from two directions perpendicular to each other and adjusts the inclination angle of the movable part, and a movable part that is installed between the movable part and the housing and pushes the movable part to both actuators. A reference plane setting device comprising: a spring to be brought into contact with the reference plane setting device; wherein a rod-shaped abutting portion parallel to a moving direction of the other actuator is provided at a tip of each actuator. 3. The reference plane setting device according to claim 1, wherein the spring is provided on the cylindrical body so as to be deviated so that a moment about the rotation axis always occurs in the same direction. .