JPH0530083Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a device for preventing fogging of glass parts such as a light projecting or light receiving lens of a laser measuring device.

Prior Art and Problems with the Invention The present applicant has developed a seventh device as a device for continuously measuring the outside diameter of a workpiece after through-feed grinding on-line during conveyance in a centerless grinding machine that grinds the workpiece by through-feed grinding. We proposed something like the one shown in the figure (see Japanese Patent Application No. 62-328014).

In the figure, a workpiece 1 is supported by a pair of left and right round belts 2 at the lower part of its outer periphery and sent forward, and during this time the outer diameter dimension is measured by a laser measuring device 3. The laser measurement device 3 includes a light projecting section 5 disposed on one side, for example, the right side, of a base 4 disposed below the conveyance path of the workpiece 1, and a light receiving section 6 disposed facing each other on the opposite side. Light projecting section 5
The laser light emitted from the front light projecting lens 7 is transmitted to the light receiving section 6.
It enters into the light receiving section 6 from the front light receiving lens 8. Then, the workpiece 1 comes out from the light projecting section 5.
The diameter of the workpiece 1 in the vertical direction is measured by receiving the laser beam that has passed above and below the workpiece 1 with the light receiving section 6.

In the laser measuring device 3 as described above, there is a problem that the lenses 7 and 8 become cloudy due to the adhesion of outside air mist from the grinding machine, and the cloudy lenses 7 and 8 block the laser beam, resulting in measurement errors. There is.

For this reason, a cover having an opening through which the laser beam passes is provided in front of the lenses 7 and 8 of the light emitting part 5 and the light receiving part 6 of the laser measuring device 3, and air is caused to flow through this opening to form an air curtain. However, this air also entered the cover, causing moisture in the air itself and outside air mist to be drawn in, so it was not effective.

The purpose of this invention is to provide an apparatus which can solve the above-mentioned problems and reliably prevent fogging of glass parts such as lenses of a laser measuring device due to adhesion of mist and the like.

(Means for Solving the Problem) The device according to this invention is a device that is installed in front of a glass component such as a light emitting or light receiving lens of a laser measuring device to prevent the glass component from fogging. A case is provided on the front side of the glass component of the laser measurement device, and the case is provided with an opening having an elongated cross-sectional shape through which the laser beam passes, and
An air passage is provided which is separated from the part facing the glass component inside the case and has an elongated cross-sectional shape corresponding to the opening. It is characterized by being suitable for

In this specification, the outside of a glass component such as a lens of a laser measuring device is referred to as the front, and the inside thereof is referred to as the rear.

Operation The air supplied to the air passage flows out diagonally forward from the outlet of the case with respect to the opening of the case, and flows out forward from the opening. Since the air passage has an elongated cross-sectional shape corresponding to the opening, the flow of air flowing out from the opening becomes uniform, and this uniform air flow allows outside air mist etc. to enter from the elongated opening. is definitely prevented. In addition, the air passage is isolated from the part of the case that faces the glass parts, and the air flowing out from the outlet of the air passage flows to the outside of the opening and does not enter the case through the opening. Even if the air supplied to the passage itself contains dust or moisture, it will not adhere to this glass component.

Embodiment Hereinafter, an embodiment in which this invention is applied to the light projecting section 5 of the laser measuring device 3 will be described with reference to the drawings. In the following description, the left and right sides when viewed from the front to the rear are referred to as left and right. That is, the left and right sides of FIGS. 1 and 2 and FIGS. 4 and 5 are referred to as right and left.

1 to 3 show a first embodiment.

The anti-fog device is a box-shaped case 1 with an opening at the rear.
0, and this case 10 is attached to the front part of the light projecting unit 5 and covers the front side of the light projecting lens 7. The case 10 includes a front wall 10a, a top wall 10b, a bottom wall 10c, and left and right side walls 10d and 10e. Top wall 10b and side wall 10d,1
The front and rear widths of 0e are equal. The front and back width of the bottom wall 10c is smaller than this, and the bottom wall 10c is smaller than the side walls 10d and 10e.
Exists only at the front of the The side walls 10d and 10e protrude slightly below the front wall 10a and the bottom wall 10c, and a splint plate 11 is fixed to the rear outer surface of this portion. The case 10 is constructed such that the rear inner surfaces of the top wall 10b and side walls 10d and 10e are in contact with the upper surface and left and right side surfaces of the light projecting part 5, and the rear edge of the bottom wall 10c is in contact with the front surface of the light projecting part 5. The bolt 1 is placed on the front part of the housing 5 and screwed into the screw hole formed in the splint 11 of the side walls 10d and 10e.
2, and the front wall 10a is the light projecting part 5.
They are located parallel to each other at a constant distance in front of the light projecting lens 7 on the front surface of the lens.

Front wall 10a of case 10 in front of floodlight lens 7
A vertically elongated slit 13 having an elongated cross-sectional shape extending vertically is formed in the slit 13 . A pair of left and right inner inclined plates 14 are fixed to both sides of the slit 13 on the front surface of the front wall 10a of the case 10, and the distance between them becomes smaller toward the front. A pair of left and right outer inclined plates 1 are provided on the outside of the inner inclined plate 14 and parallel to the inner inclined plates 14.
5 are fixed at small intervals. Both upper and lower ends of the space between the front wall 10a and the inner inclined plate 14 of the case 10 and the space between the inner inclined plate 14 and the outer inclined plate 15 are closed off by an upper plate 16 and a lower plate 17. Slits 18 and 19 corresponding to the slit 13 of the front wall 10a are formed between the front ends of the left and right inner inclined plates 14 and between the front ends of the left and right outer inclined plates 15. Outer inclined plate 1
A splint 20 is fixed to the rear outer surface of the splint 2.
0 and the outer inclined plate 15 are formed with air introduction screw holes 21 passing through them. Connecting fittings 22 connected to an air supply hose 24 are screwed into these screw holes 21 . In addition, the narrow space between the inner inclined plate 14 and the outer inclined plate 15 is separated from the portion of the case 10 facing the light projecting lens 7, and has an elongated cross-sectional shape corresponding to the slits 18 and 19. It is called passage 23. The outlet of the air passage 23 is the slit 18, 19.
The portion faces diagonally forward with respect to the slits 18 and 19. In this embodiment, the air passages 23 are provided on the left and right sides, but either one may be provided.

A certain amount of air is always supplied to the air passage 23 of the anti-fogging device from the connection fitting 22, and this air flows diagonally forward along the air passage 23 and exits the case 10 through the slit 19. . In this way, the air flows obliquely in the direction away from the projection lens 7 and flows from the slit 19 to the case 10.
Since the air flows out to the outside, this air and outside air are not drawn into the case 10, and fogging of the projection lens 7 is completely prevented. Furthermore, since the air supplied to the air passage 23 is not drawn into the case 10, this air does not necessarily have to be dry air.

Note that the laser light emitted from the light projecting lens 7 of the light projecting section 5 passes through the slits 13, 18, and 19 to exit the case 10. Further, when the above-mentioned anti-fogging device is applied to the light receiving section 6 of the laser measuring device 3, the laser light enters the light receiving section 6 from the light receiving lens 8 through the slits 19, 18, and 13.

4 to 6 show a second embodiment, in which the same parts as in the first embodiment are given the same reference numerals.

The anti-fogging device of the second embodiment also includes a case 10 similar to that of the first embodiment. This case 10 is attached to the front part of the light projecting section 5 by suitable means such as screws, and covers the front side of the light projecting lens 7. A relatively large square hole 30 is formed from the center to the left side of the front wall 10a of the case 10.
A cover plate 31 that closes this square hole 30 is fixed to the front surface of a. In front of the projection lens 7 at the right end of the square hole 30, there is a light passage section 3 whose vertical width is slightly smaller than the other sections.
0a is formed, and a vertically long slit 32 is formed in a right-hand portion of the cover plate 31 to coincide with this light passage portion 30a. An air chamber 33 with a small front and rear width surrounded by a wall is formed on the left side of the slit 32 on the rear surface of the cover plate 31 inside the square hole 30 of the case 10. The vertical width of the air chamber 33 is equal to the vertical width of the light passage portion 30a of the square hole 30 and the slit 32 of the cover plate 31. A splint plate 34 is fixed to the rear left side of the rear wall 33a of the air chamber 33, and a hose connection fitting 35 is inserted into a screw hole penetrating the splint plate 34 and the rear wall 33a.
is screwed in. Right side wall 33b of air chamber 33
There is a slit-shaped air passage 3 that slopes toward the front to approach the slit 32 of the cover plate 31.
6 is formed over the entire vertical length, and its front end faces the left rear end of the slit 32 of the cover plate 31.

A certain amount of air is always supplied to the air chamber 33 of the above-mentioned anti-fogging device from the connection fitting 35, and this air flows diagonally forward from the air chamber 33 along the air passage 36, and slit 32
go outside. As in the case of the first embodiment, fogging of the projection lens 7 is prevented. Also,
The laser light emitted from the light projection lens 7 of the light projection section 5 passes through the light passage section 30a of the square hole 30 of the case 10 and the cover plate 3.
It exits the case 10 through the slit 32 of No. 1.

The configurations of the case, opening, and air passage of the anti-fogging device are not limited to those of the above embodiments, and can be modified as appropriate.

Effects of the invention According to the device of this invention, as described above, outside air mist is reliably prevented from entering into the case from the opening portion having an elongated cross-sectional shape through which the laser light passes, and the outside air mist is also supplied to the air passage. It is possible to reliably prevent dust and moisture contained in the air itself from adhering to glass parts, and therefore it is possible to reliably prevent glass parts such as lenses of a laser measuring device from fogging up.

[Brief explanation of the drawing]

Fig. 1 is a horizontal sectional view (enlarged sectional view taken along the line in Fig. 2) of a fog prevention device showing the first embodiment of this invention, Fig. 2 is a front view of the same, Fig. 3 is a side view of the same, and Fig. 4 is a The figure is a front view showing the second embodiment, Fig. 5 is a cutaway plan view of the same part, Fig. 6 is a horizontal sectional view showing an enlarged main part of Fig. 5, and Fig. 7 is a schematic diagram of the laser measuring device. FIG. 3 is a side view showing the configuration. 3... Laser measuring device, 5... Light projecting section, 6...
Light receiving section, 7, 8...Lens, 10...Case, 1
3,18,19...slit, 23...air passage, 30...square hole, 32...slit, 36...
air passage.

Claims (1)

[Scope of Claim for Utility Model Registration] A device that is installed on the front side of a glass component such as a light emitting or light receiving lens of a laser measuring device to prevent the glass component from fogging, which includes: A case is provided on the front side of the component, and the case is provided with an opening having an elongated cross-sectional shape through which the laser beam passes, and
An air passage is provided which is separated from the part facing the glass component inside the case and has an elongated cross-sectional shape corresponding to the opening. A fog prevention device for a laser measuring device, which is characterized by being oriented toward the camera.