JPH0735738Y2 - Laser marking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] For example, at a construction site, it is necessary to carry out marking work for drawing vertical lines and horizontal lines, and use of a laser beam for this marking work has started.

The present invention relates to a laser marking device used for this work.

[Problems to be Solved by Conventional Techniques and Inventions] In a known laser marking device, a laser beam is projected vertically downward from the device body on a tripod and at the same time from the lens barrel at the top of the device. There is one that projects a vertical fan-shaped laser beam toward the side. That is, this device has a laser tube that projects a laser beam from both upper and lower ends along the central axis, reflects the laser beam projected from the upper end of this laser tube, and projects a vertical fan-shaped laser beam toward the side. The lens barrel is attached integrally to the laser tube. Moreover, a gyro ring coaxial with the central axis of the laser tube, which controls the posture so that the central axis of the laser tube always faces the vertical direction, is supported so as to be rotatable together with the laser tube.

When drawing a vertical line, that is, a center line on the wall surface using this laser marking device, first set the reference ground ink point on the floor surface and set the ground ink line passing through this ground ink point in advance on the floor. Draw on the surface. A marking device is set up on the ground ink point using a tripod, and the height of the tripod is adjusted to adjust the direction of the laser beam emitted downward so that the spot drawn by the beam on the floor surface is aligned with the ground ink point. Next, the lens barrel is rotated around the vertical axis to change the direction of the fan-shaped laser beam, and the line drawn by the beam on the floor surface is aligned with the ground ink line.
The line drawn by the fan-shaped laser beam on the wall surface when the laser tube stops shaking is the desired core.

However, especially when the wall surface on which the line core is to be drawn is far from the marking device, the position of the line drawn by the fan-shaped laser beam changes greatly even if the lens barrel is rotated by a slight angle. Moreover, when the lens barrel is rotated, the laser tube integrally attached to the lens barrel shakes, and the line drawn by the beam also shakes. Therefore, it was very difficult to match the line drawn by the beam on the floor with the ground line.

An object of the present invention is to provide a laser marking device which facilitates fine adjustment of the beam projection direction.

[Means for Solving the Problem] A laser marking device according to the present invention is provided with a gear in the circumferential direction of a gyro ring, and a shaft provided with another gear that meshes with the gear. It has a knob fixed to the tip.

[Operation] When the knob is turned, the rotational force is transmitted to the gyro ring via the shaft and the two gears. Rotation of the gyro ring about its axis causes rotation of the laser tube and barrel about its central axis. Therefore, the projection direction of the vertical fan-shaped laser beam slightly changes without touching the lens barrel.

[Embodiment] FIGS. 1 to 3 show a laser marking apparatus according to an embodiment of the present invention.

As shown in FIG. 3, in the marking out device 3, a tripod 6 is attached to the lower surface of a head housing 4. The screw 7 provided on the grounded portion of the tripod 6 is for adjusting the posture of the marking-out device 3 as a whole. A protective tube 12 having a laser tube 10 coaxially fixed therein projects downward through an opening in the lower surface of the head housing 4. Laser tube 10 is, for example, 1mW
A straight deflection type helium neon gas laser tube,
Laser beams are projected from both upper and lower ends along the central axis. A cylindrical lens barrel 16 is coaxially fixed to the upper end of the protection tube 12, and the lens barrel 16 is attached to the head housing 4
Project upward through the top opening of the.

A half mirror, a rod lens, and the like (not shown) are provided inside the lens barrel 16, and a laser beam projected vertically upward from the laser tube 10 is provided on the upper surface and the peripheral surface of the lens barrel 16 respectively. Projected through 18,20. However, the laser beam emitted from the projection window 18 on the upper surface of the lens barrel is converted so as to draw a cross hair, and the beam emitted from the projection window 20 on the side surface of the lens barrel becomes a vertical fan surface.

The lower end 22 of the protective tube 12 is formed into a pointed shape,
The laser beam projected downward from 10 is projected from the lower end opening of the protective tube 12. The lower end of the protective tube 12 has a pointed portion 22.
Except for, is covered with a cylindrical windshield 24 which is fixed to the lower surface of the head housing 4 coaxially with the protective tube 12. This windshield 24
A stopper tube 28 made of transparent plastic is fitted on the outer peripheral surface of the lower end portion of the same through two O-rings 26 so as to be vertically movable. Inside the stopper tube 28, there is a stopper plate having a hole 30 into which the pointed portion 22 of the protection tube 12 can be loosely fitted.
32 are installed horizontally. Stopper tube on the perimeter of the windshield 24
The knobs 34 are screwed into the upper position of 28 at 120 ° intervals, and the tips of the knobs 34 can be fixed by bringing them into contact with the outer peripheral surface of the protective tube 12.

As shown in FIGS. 1 and 2, a circular ring-shaped support plate 42 is horizontally fixed in the head housing 4, and the outer gyro ring 8 has four inverted L-shaped holding plates 45, 4.
6, 47 and 48 are rotatably supported on the support plate 42 coaxially therewith. An inner gyro ring 9 is arranged in the hole of the outer gyro ring 8, and a protective tube 12 containing the laser tube 10 is provided inside the inner gyro ring 9 and a supporting plate.
It penetrates through the 42 holes and the inner gyro ring 9 is a protective tube.
Supports twelve. The inner and outer gyro rings 8 and 9 constitute a gyro that controls their postures so that the central axes of the protection tube 12 and the laser tube 10 are always oriented in the vertical direction. A small gear 50 is fixed to the edge of the outer gyro ring 8 with two screws 51 and 52. Another gear 60 meshing with the gear 50 is formed in the middle of a shaft 61 extending in the vertical direction. The lower end of the shaft 61 has a shaft holder 62,
It is rotatably supported on the support plate 42 by a collar 63, an E ring 64 and a cap screw 65. The upper end of the shaft 61 projects from the upper surface of the head housing 4, and a knob 40 is attached to the tip thereof.

The lens barrel 16 integrally attached to the protection tube 12 can be rotated not only directly by hand by a large amount, but can also be rotated by a small angle by turning the knob 40.

FIG. 4 shows a modification of the support structure for the outer gyro ring 8.

In this outer gyro ring 8, three oval holes 71, 72, 73 penetrating vertically are equally arranged at 120 °. Each oval hole 71,7
The 2,73 central angle θ is about 10 °. Reference numerals 74, 75 and 76 are oval holes
71, 72, 73 are shown, with these pins 74, 75, 76 making the outer gyro ring 8 about the support plate 42
It is supported so that it can rotate only 10 °. A small gear 50 is fixed to the edge of the outer gyro ring 8 with screws 51 and 52, and another gear 60 that meshes with the gear 50 is provided as in the case of FIGS. 1 and 2. .

FIG. 5 is a perspective view in the case of drawing a core using the laser marking device 3 according to the embodiment of the present invention described above.

In addition to setting the standard black ink point 80 on the floor in advance,
A ground ink line 81 passing through the ground ink point 80 is drawn on the floor surface. Set up the marking device 3 on the ground ink point 80 using the tripod 6, and hold the knob.
Gyro rings 8 and 9 and laser tube 10 with the 34 loosened
Supply electricity to. When the laser tube 10 starts to emit light, the laser beam emitted downward draws a spot near the ground ink point 80, and the laser beam emitted from the projection window 18 on the upper surface of the lens barrel draws a crosshair 82 on the ceiling surface and the lens barrel. Side projection window 20
The fan-shaped laser beam emitted from the laser beam draws in-plane lines 84 and 85 on the wall surface and the floor surface, respectively. At this time, the lens barrel 16 is turned by hand so that the line 85 drawn by the beam on the floor surface substantially coincides with the ground ink line 81.

Next, the stopper tube 28 is lowered to release the protective tube 12. At this time, even if the floor surface is inclined, the central axis of the laser tube 10 is adjusted to the vertical posture by the action of the gyro rings 8 and 9. However, when the liberation of the released protection tube 12 is large, the stopper tube 28 is raised and the pointed portion 22 of the protection tube 12 is lightly applied to the hole 30 of the stopper plate 32 to stop the deflection of the protection tube 12. Then, the screw 7 of the tripod 6 is turned to adjust the direction of the laser beam emitted downward, and the spot drawn by this beam on the floor surface is aligned with the ground ink point 80. Further, the knob 40 is turned to finely adjust the projection direction of the fan-shaped laser beam, and the line 85 drawn by the beam on the floor surface is made to completely coincide with the ground ink line 81.

When the above operation is completed, a cross line 82 corresponding to the ground ink line 81 is drawn at a position just above the ground ink point 80, and the line 84 on the wall surface becomes the core as desired.

[Effects of the Invention] As described above, the laser marking device according to the present invention is provided with a gear in the circumferential direction on the gyro ring, and a shaft having another gear meshing with the gear is provided. Since the knob is fixed to the tip of the shaft, the beam projection direction can be easily fine-tuned by turning the knob at the tip of the shaft. Moreover, since it is not necessary to directly turn the lens barrel by hand, the laser tube is not unnecessarily rocked. Therefore, according to the present device, the marking operation can be performed very efficiently.

[Brief description of drawings]

1 is a sectional view taken along the line I-I of FIG. 2 showing the outline of the upper end internal structure of a laser marking apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view of the internal structure of the previous figure. FIG. 3 is a side view of the laser marking device of FIGS. 1 and 2, FIG. 4 is a plan view showing a modification of the gyro ring support structure, and FIG. 5 is an embodiment of the present invention. It is a perspective view which shows the use condition of a laser marking device. Explanation of symbols 3 ... Laser marking device, 4 ... Head housing, 6 ...
Tripod, 8 ... Outer gyro ring, 10 ... Laser tube, 16 ...
Lens barrel, 18, 20 ... Projection window, 40 ... Fine adjustment knob, 42 ... Support plate, 45, 46, 47, 48 ... Holding plate, 50, 60 ... Gear, 61 ... Shaft, 71, 72, 73 ... Oval hole , 74, 75, 76… Pins.

Claims (1)

[Scope of utility model registration request] 1. A laser tube which projects a laser beam from both upper and lower ends along a central axis, reflects the laser beam projected from the upper end of the laser tube, and projects a vertical fan-shaped laser beam laterally. The lens barrel is attached integrally to the laser tube, and the attitude of the laser tube is controlled so that the central axis of the laser tube always faces the vertical direction. The gyro ring coaxial with this is supported so that it can rotate with the laser tube. In the laser marking device, the gyro ring is provided with a gear in the circumferential direction, a shaft having another gear meshing with the gear is provided, and a knob is fixed to the tip of the shaft. Laser marking device.