JPH08123Y2 - Protective device for optical receiver of optical automatic measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a device for protecting a light-receiving surface of a light receiver used in an optical automatic measuring device.

[Prior Art] In the machine tool of the numerical control system, the shape of the workpiece,
An optical automatic measuring device, such as an optical measuring probe, is used to detect dimensions and the like. In this case, the detection signal of the measurement result by the optical measuring probe is sent as a radio wave to the light receiver side fixed at a remote position. The light receiver catches the input signal and transmits necessary information to the control system. Thereby, the machine tool performs a predetermined automatic control.

On the other hand, in a machine tool such as a machining center having an automatic tool changer, the optical measurement probe is automatically installed in the spindle to perform automatic measurement, and a cutting tool is placed in the spindle instead of the optical measurement probe. In many cases, it is automatically mounted and then cut. At the time of automatic measurement by the optical measurement probe, it is necessary that the optical measurement probe and the light receiver are arranged at a position facing each other. Of course, the light receiving surface is open, and the optical measurement probe is It is placed facing. Therefore,
The light receiving surface is kept open even during cutting.

[Problems to be Solved by the Invention] During cutting of a workpiece, cutting chips, dust, and the like are generated, and cutting oil is scattered around the workpiece.
Therefore, when the light receiving surface is left open, scattered chips, dust, cutting oil, etc. hit the light receiving surface, causing damage to the light receiving surface or clouding the surface. Further, in the case of high speed cutting, there is a problem that the light receiving surface is damaged by the scattered chips. Further, dirt on the light-receiving surface causes measurement error and erroneous information is transmitted to the control system, which in the worst case may damage or damage the work piece, the tool, the measuring instrument, and the like.

The present invention solves the above problems by preventing damage and dirt on the light-receiving surface of the receiver, transmitting accurate measurement signals to the control system, and making accurate measurements when measurement is required. It is an object of the present invention to provide a protection device for a light receiver of an optical automatic measuring device that can perform

[Means for Solving the Problems] In order to achieve the above object, the present invention is a light receiver protection device that catches a measurement signal from an optical automatic measurement device at a remote position and sends an information signal to a control system. A protective cover for the light-receiving surface of the light-receiving device is provided on the front surface of the light-receiving surface of the light-receiving device, and a drive device for opening and closing the protective cover is provided. is there.

[Operation] During automatic measurement, the protective cover of the protective device is opened, and the light receiving surface of the light receiver faces the measuring device side mounted on the spindle side of the machine tool. Therefore, correct measurement is performed. On the other hand, during cutting, the protective cover is closed, and chips, dust, and cutting oil scattered during cutting hit the protective cover,
Do not touch the internal light receiving surface. As a result, the light receiving surface is protected. The opening and closing of the protective cover may be automatically operated by the control system of the machine tool or may be manually operated.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall structure of the protection device. The light receiver 2 having the light receiving surface 3 on the front surface is housed and fixed in a cylindrical case body 5, and is connected to a machine control system 17 via a lead wire 4 thereof. An opening 6 is provided at a position facing the light receiving surface 3 of the case body 5. The protective cover 1 covers the opening 6, and is formed of an arc body. A rod 7 of a cylinder 8, which is one of driving means, is pin-connected to one end of the protective cover 1. The end of the cylinder 8 is pin-supported by a bracket 9 fixed to the case body 5. The cylinder 8 is reciprocally moved by a drive mechanism 18 connected to it, and a control device 19
Automatically controls the drive mechanism 18.

With the above configuration, the cylinder 8 operates via the drive mechanism 18 according to a command from the control device 19, and the protective cover 1 moves in the direction of opening or closing the opening 6. The protective cover 1 may be any material as long as it is not damaged by chips, dust, etc., and its material is not deteriorated by the adhesion of cutting oil.
In addition, any device capable of interrupting a signal from the optical measuring device mounted on the spindle side may be used.

As the material of the protective cover, for example, glass, mica, heat-resistant hard and transparent synthetic resin such as polyether or polycarbonate is used.

Fig. 2 shows a drill 12 which is one of the cutting tools for the work piece 13
The case of drilling is shown by. When the tool shank 10 holding the drill 12 is mounted in the spindle 11, an automatic exchange signal is input to the control device 19, so that the processing start time is automatically grasped. Therefore, an operation command is issued from the control device 19 to the drive mechanism 18, and the cylinder 8 is protected by the protective cover 1.
Move in the closing direction. Cutting 14 scatters as shown by the cutting process, but since the protective cover 1 closes the opening 6 of the case body 5, the light-receiving surface 3 is not hit with cutting chips, dust, or cutting oil. It is completely cut off from these. Further, since the protective cover 1 is also made of the material having the above-mentioned properties, no special damage occurs.

FIG. 3 shows the optical measuring probe 15 inserted in the spindle 11. The optical measuring probe 15 is its contact
16 is brought into contact with the workpiece 13 to send measurement information such as its shape and dimensions, and a measurement signal is emitted from the not-shown transmitter toward the light receiving surface 3 as indicated by an arrow. Optical measuring probe
When 15 is mounted in the spindle 11, the fact is recognized by the control device 19, so that the cylinder 8 moves the rod 7 in the opening direction to open the protective cover 1. As a result, the opening 6 of the case body 5 opens, so that the measurement signal from the optical measurement probe 15 is input to the light receiving surface 3 of the light receiver 2 and the necessary information is transmitted to the control system 17. As a result, accurate measurement can be performed without problems.

In the present embodiment, the one in which the protective cover 1 is automatically opened / closed has been described, but of course, it may be manually opened / closed when necessary. Further, in this embodiment, the case body 5 has a cylindrical shape and the protective cover 1 has an arc shape. However, it may have a spherical shape, a hemispherical shape, or another shape. Further, although the present embodiment has been described with respect to the processing by the drill 12, it is needless to say that it is also applied to the case of using other cutting tools.

[Effect of Invention] According to the present invention, the following effects can be obtained.

(1) Since the light-receiving surface is completely closed by the protective cover during cutting, cutting chips, dust, and cutting oil generated during cutting are blocked by the protective cover, and the light-receiving surface is completely protected. Therefore, the light receiving surface is not damaged or soiled.

(2) When the measurement is necessary, the protective cover opens and
Since the light-receiving surface is not contaminated, accurate measurement is always stable.

(3) The protective cover and its driving means are simple,
It can be implemented at low cost and can be easily attached to an existing machine tool.

(4) Since each part consists of pins, it can be easily removed when not needed.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, FIG. 2 is a side view for explaining the closed state of the protective cover during processing, and FIG. 3 is an open state of the protective cover during automatic optical system measurement. It is an explanatory side view shown. 1 ... Protective cover, 2 ... Receiver, 3 ... Receiving surface, 4 ...
Lead wire, 5 ... case body, 6 ... opening, 7 ... rod, 8 ... cylinder, 9 ... bracket, 10 ... tool shank, 11 ... spindle, 12 ... drill (cutting tool), 13 ... Workpiece, 14 ... Chip, 15 ... Optical measuring probe, 16 ... Contact, 17 ... Control system, 18 ... Drive mechanism, 19 ... Control device.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A protection device for a photoreceiver that catches a measurement signal from an optical automatic measuring device at a remote position and sends an information signal to a control system, the protection device covering the front surface of the light receiving surface of the photoreceiver. A protective device for a photoreceiver of an optical automatic measuring device, characterized by comprising a cover and a drive means for opening and closing the protective cover.