JPH0592628U - Object detection device - Google Patents

Abstract

(57) [Abstract] [Purpose] Providing highly accurate measuring devices. A rotatable contactor, an optical fiber which is inserted into the contactor and has a reflection film at one end, and an optical fiber for transmission and reception provided facing the other end of the reflection film of the optical fiber with the reflection film. An object detection device comprising:

Description

[Detailed description of the device]

[0001]

[Target of device]

 The present invention relates to a device for detecting the presence or absence of an object.

[0002]

[Prior Art]

 Machine tools and the like are required to have improved processing accuracy. For that purpose, it is necessary to accurately detect (measure) the position of the object (workpiece) (starting point of processing) and to accurately grasp (measure) the dimensions during processing.

Conventionally, as a detection device for such an application, there is a device for detecting by forming an electric closed circuit by contact between a contactor and a workpiece, an electrostatic capacitance depending on a distance between the contactor and the workpiece, and the like. The electrical type that detects by the difference and the optical type that detects the presence or absence of reflected light by applying a light beam are in practical use.

[0004]

[Problems of conventional technology]

 However, in the electric method of the above-mentioned conventional method, malfunction or accuracy may occur due to non-conductivity due to adhesion of cutting oil or the like on the surface of the work piece and electric noise generated from the electric motor used in the drive device of the machine tool. The decline is a problem. Further, in the optical system as well, there is a problem in that the reflection surface (workpiece) becomes unstable due to the adhesion of cutting oil and the like, which causes a decrease in accuracy.

[0005]

[The purpose of the device]

 An object of the present invention is to solve the above-mentioned drawbacks of the conventional device and to provide a highly accurate measuring device.

[0006]

[Key points of the device]

 The gist of the present invention is that the presence or absence of an object is detected by the mechanical displacement of the contact due to the direct contact of the contact with the object, and the displacement is detected by the presence or absence (increased or decreased) of the reflected light from the optical fiber with a reflective film inserted. This prevents the accuracy from decreasing.

[0007]

[Example of device]

 An embodiment of the detection device according to the present invention is shown in FIG.

The contactor 1 is rotatably fixed to the contactor housing 7 by a support shaft 8. The optical fiber 2 with a reflection film is inserted into the contactor 1 with the reflection film 2a side as the inside. The optical fiber 3 for transmitting and receiving light is fixed and housed in the other end of the contact housing 3 so as to face the optical fiber 2 with a reflective film so that the optical axis thereof coincides with the contact 1 not contacting the object. It is connected to the. Reference numeral 5 is a light emitting element and 6 is a light receiving element.

When the contactor 1 is not in contact with the object, the light beam emitted by the light emitting element 5 passes through the optical fiber 3 for transmitting and receiving light, enters the optical fiber 2 with a reflective film, and is reflected by the reflective film 2a for transmitting and receiving light. The light passes through the optical fiber 3, is separated by the light separator 4, and is received and detected by the light receiving element 6.

When the contactor 1 comes into contact with an object when the entire device is moved, the contactor 1 rotates about a support shaft 8 as a fulcrum, so that the optical axis of the optical fiber 2 with a reflective film is used as the optical axis of the optical fiber 3 for transmitting and receiving light. Shifts in position and angle. Therefore, the amount of light incident on the optical fiber with a reflection film is reduced, and the amount of light reflected by the reflection film and returned to the optical fiber for transmitting and receiving is reduced. As a result, the amount of light returning to the light receiving element 6 is drastically reduced. From this, it is possible to detect contact with an object by a change in the amount of light received by the light receiving element 6.

The contactor 1 is provided with a pair of holes 1 a facing each other in the direction perpendicular to the support shaft 8, and accommodates the spring 10 and the movable piece 9. The movable piece 9 is contacted by a spring 10. It is pressed against a V-shaped groove 7 a provided on the inner surface of the child storage device 7. Therefore, when no external force is applied to the contactor 1, the movable piece 9 is stable in the deepest position (vertex, outer side) of the V-shaped groove 7a (in this state, the optical fiber with the reflective film is provided). It goes without saying that the optical axes of 2 and the optical fiber 3 for transmitting and receiving light are adjusted so that they coincide with each other.

Although only the detection of the presence or absence of the object has been described above, the position where the presence or absence of the object is detected can be known and the dimension can be known by combining with the technology of the machine tool or the robot.

[0013]

[Effect of the device]

 Since the detection device according to the present invention uses light rays, it is not affected by electrical noise.

By using the optical fiber with a reflective film, the change in the amount of reflected light due to the displacement is large and the detection accuracy is improved as compared with the case where the reflecting mirror is provided facing the optical fiber for transmitting and receiving light.

Since the reflecting surface (mirror) is not exposed to the atmosphere by using the optical fiber with a reflecting film, the reflecting efficiency is not impaired for a long period of time.

[0016] There are effects such as the above, and their practical value is great.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Contact 1a Hole 2 Optical Fiber with Reflective Film 2a Reflective Film 3 Optical Fiber for Transmitting and Receiving 4 Optical Separator 5 Light-Emitting Element 6 Light-Receiving Element 7 Contactor Housing 7a V-Shaped Groove 8 Spindle 9 Moving Piece 10 Spring

Claims (1)

[Scope of utility model registration request] Claims: 1. A rotatable contactor, an optical fiber which is inserted into the contactor and has a reflective film at one end, and a light-receiving / transmitting device provided facing the other end of the reflective film of the optical fiber with the reflective film. An object detection device comprising an optical fiber.