JPH0430486Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) This invention relates to an inclination angle measuring device for automatically measuring the inclination angle of a surface to be measured of an object.

(Prior Art) In bending machines such as press brakes and other processing machines, it is necessary to precisely measure the bending process and cutting angle of a workpiece. However, there is no known device that automatically measures the inclination angle of a surface to be measured of a workpiece or other object in such a processing machine.

(Problems to be Solved by the Invention) As described above, no inclination angle measuring device that automatically measures the inclination angle of a surface to be measured is known.

This idea was created in view of these conventional problems.For example, when measuring the bending angle of a workpiece in a bending machine, it is possible to automatically measure the inclination angle of the surface of the object to be measured. An object of the present invention is to provide an inclination angle measuring device.

[Structure of the idea]

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a light projector that projects a laser beam onto the surface of a workpiece, and a light receiver that receives reflected light from the surface. A main body is rotatably provided on a movable base, a rotation drive device is provided to automatically rotate the main body with respect to the movable base, and an angle detection device is provided to detect a rotation angle of the main body from a reference position. It consists of a container.

(Embodiment) FIG. 1 shows an embodiment of this invention, in which a semiconductor laser 3 is provided as a light projecting means in a main body 1, and a collimator 5 for the laser beam from this semiconductor laser 3 is provided.
is provided. Further, a beam splitter 7 is provided in front of the collimator 5 so as to form an angle of 45° with respect to the optical axis.

A photodiode as a light receiving means or
A light receiver 9 such as a PSD is connected to a beam splitter 7.
The laser beam LB is provided at a position perpendicular to the optical axis of the laser beam LB. The semiconductor laser 1 serves as a light emitting means, and the light receiver 9 serves as a light receiving means.
The beam splitter 7 makes their optical axes common in the following manner. That is, the laser beam LB emitted from the semiconductor laser 3 via the collimator 5 passes through the beam splitter 7 from the back to the front and exits the main body 1. The laser beam LB reflected by the main body 1 is reflected at 90° by the beam splitter 7 and enters the light receiver 9. Therefore, the semiconductor laser 3 and the light receiver 9 have a common optical axis.

In the figure, the main body 1 is installed on a movable base 11 so as to be rotatable around an axis perpendicular to the paper surface. This movable table 11 is rotationally driven by a pulse motor serving as a rotational driving means, as will be described later.

An angle recognition optical fiber sensor 1 is installed on the back of the main body 1.
3 is provided as an angle detection means. Therefore, in Figure 1, when the inclination angle is 0° when the laser beam LB is emitted vertically downward, positive rotation is detected in the counterclockwise direction, and negative rotation angle is detected in the clockwise direction. It turns out.

As shown in FIGS. 2 and 3, such an inclination angle measuring device can be used, for example, to measure the bending angle of a workpiece in a bending machine such as a press brake. In this case, the workpiece W is compressed between the upper and lower punches 15 and the die 17,
A predetermined bending angle is given, and the bending angle at that time is measured as follows.

FIG. 2 shows the electrical system connection of the inclination angle measuring device, in which the measuring device 19 is connected to the punch 15.
Two machines are installed to detect the bending angle of the workpiece W on both the left and right sides. Signals from both measurement devices 19 and power supply to both measurement devices are supplied from the main unit 23 via a preamplifier 21. The main unit 23 includes a power supply unit 25, a pulse motor controller 27 for driving the movable base 11,
Furthermore, a laser beam controller and a rotation angle detection section 29 are provided.

Therefore, as shown in FIG. 3, when the work W is bent at a specific angle, by driving the pulse motor controller 27, the angle measuring device 19
The laser beam LB is emitted toward the work W while being rotated around a rotation axis perpendicular to the plane of the paper. The laser beam irradiated to the workpiece W is reflected by the workpiece W, but the workpiece W and the laser beam
When the laser beam and LB are at right angles, the laser beam LB
is reflected in a direction exactly opposite to the direction of incidence and returns to the measuring device 19 again. The reflected laser beam returning to the measuring device 19 is refracted at right angles by the beam splitter 7 and enters the light receiver 9.
If the laser beam LB is not incident on the work W at a right angle, the reflected laser beam will not return to the measuring device 19 again.

Therefore, when the receiver 9 receives the reflected laser beam, the angle recognition optical fiber sensor 13 determines the rotation angle of the measuring device 19, that is, the laser beam LB.
The rotation angle of the optical axis is detected, and the bending angle of the workpiece W is calculated from this.

FIG. 3 shows the inclination angle measurement positions when the workpiece W is bent at 20° and 50° from a flat state where it is not bent.

In this way, the measuring device 19 is rotated while emitting the laser beam LB from the inclination angle measuring device 19 to the surface to be measured of the object, and when the light receiver 9 receives the laser beam reflected from the surface to be measured. Optical fiber sensor 1 that recognizes the rotation angle of
3, and the inclination angle of the surface to be measured is determined from the detected angle.

Although the above embodiment shows an example in which this inclination angle measuring device is used to automatically detect the bending angle of a workpiece in a bending machine such as a press brake, this invention is limited to the above embodiment. It's not a thing. Therefore, it can be widely used to measure the inclination angle of a specific measurement target surface of various target objects. This invention can be modified in various ways within the scope of the technical idea stated in the claims for utility model registration.

(Effects of the invention) As can be understood from the above description of the embodiment, the present invention is equipped with a light projector 3 that projects a laser beam LB onto the surface of the workpiece W, and receives reflected light from the surface. A main body 1 including a light receiver 9 is rotatably mounted on a movable base 11, and a rotation drive device is provided to automatically rotate the main body 1 relative to the movable base 11. Angle detector 13 that detects the rotation angle of the main body 1
It is made up of the following.

As is clear from the above configuration, in the present invention, the main body 1, which includes a light emitter 3 and a light receiver 9 for receiving reflected light, is rotatably mounted on the movable base 11, and The apparatus is equipped with a rotational drive device that automatically rotates the main body 1, and an angle detector 13 that detects the rotation angle of the main body 1 from a reference position.

Therefore, according to the present invention, the surface of the workpiece W is irradiated with the laser beam LB, and the main body 1 is automatically rotated so that the light receiver 9 receives the reflected light, and the light receiver 9 receives the reflected light. By detecting the rotation angle of the main body 1 from the reference position when the light is received by the angle detector 13, the inclination angle of the surface of the workpiece W with respect to the reference position can be detected.

[Brief explanation of drawings]

Fig. 1 is an optical explanatory diagram of an embodiment of this invention, Fig. 2 is an explanatory diagram of a system when the above embodiment is used for detecting the bending angle of a workpiece in a press brake, and Fig. 3 is an explanatory diagram of a system in which the above embodiment is used to detect the bending angle of a workpiece in the above system. FIG. 3 is an explanatory diagram illustrating a bending angle measurement operation. DESCRIPTION OF SYMBOLS 1... Main body, 3... Semiconductor laser, 5... Collimator, 7... Beam splitter, 9... Light receiver, 11... Movable base, 13... Angle recognition optical fiber sensor.

Claims (1)

[Scope of utility model registration request] A main body 1 comprising a light emitter 3 for projecting a laser beam LB onto the surface of the workpiece W and a light receiver 9 for receiving reflected light from the surface is rotatably mounted on a movable base 11. A tilt angle characterized in that a rotary drive device is provided to automatically rotate the main body 1 relative to the reference position, and an angle detector 13 is provided to detect the rotation angle of the main body 1 from a reference position. measuring device.