JPH1130520A - Marking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a beam projector lockable when a marking device is not in use and to perform the locking and cancellation operations while being linked to the switching operation of a power switch. SOLUTION: In the marking device that has a beam projector 4 being supported by a supporting means and a battery 7 for power supply in a case 1 and projects beams from the beam projector 4 toward the outside from the window of the case 1, a switching operation lever 16 for power switch is projected outside the case 1 and is provided so that it can be rotated between ON and OFF positions, at the same time a switch switching/projector locking mechanism 17 that opens a power switch when the above lever 16 is at the OFF position and locks the beam projector 4 and closes the power switch when the lever 16 is rotated to the ON position and cancels the locking of the beam projector 4 is provided in the case 1 while being linked to the lever 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blackout device used for performing blackout work when installing, for example, a window frame or a lighting device in a construction work site.

[0002]

2. Description of the Related Art Conventionally, this type of blackout device is pivotally supported by a pivoting means in a cylindrical case appropriately provided with a plurality of supporting legs, and is always pivoted vertically in use. 2. Description of the Related Art There is known a beam projector that includes a beam projector and a battery for a beam power source, and projects a beam from the projector to an outside through a window provided in the case.

[0003]

Since the beam projector is pivotally supported by pivot means, the beam projector must be locked immovably when not in use. Heretofore, the locking means has been insufficient, and there has been a problem in dustproofness. The invention according to claim 1 aims to solve this problem.

In addition, this type of blackout device is provided with a magnetic braking means for restraining the beam projector from swinging as quickly as possible during use and stopping it in a vertical state to perform blackout work quickly. However, in the conventional blackout device, the magnetic braking means is provided by projecting a braking plate on a side surface of the beam projector, and a magnet piece is provided so as to sandwich the braking plate. This requires a large space in the direction, which not only increases the size of the apparatus, but also makes the beam projector slightly unstable in the vertical state due to the mounting position of the brake plate. An object of the invention according to claim 4 is to solve this problem.

[0005] In the conventional blackout device, the beam projector is arranged along the center axis in the cylindrical case.
Since a space for accommodating the battery is required on the side of the beam projector in the case, the diameter of the case is inevitably increased by arranging the beam projector at the center of the case. In addition to increasing the size, the distance in the case radial direction from the beam projector to the slit-shaped window opened in the case becomes considerably longer, and it is necessary to increase the length of the slit-shaped window and increase the slit width, For this reason, dust easily penetrates the inside of the window, resulting in a decrease in mechanical accuracy and life. In this case, the length of the window becomes longer and the width becomes wider because a mirror and a beam line emitting lens are attached to the upper end of the beam projector, and the beam coming out along the axis from the inside of the projector After being reflected by the mirror, it passes through the beam line light-emitting lens, and is projected from the slit-shaped window to the outside.As the distance in the case radial direction from the beam projector to the window becomes longer, This is because it is necessary to increase the length of the slit window and increase the width thereof. As described above, conventionally, it was necessary to make the slit-shaped window considerably large, so that dustproof glass could not be attached to the slit-shaped window due to the occurrence of distortion, strength, and the like. There was a possibility that dust would enter the case. The invention according to claim 6 aims to solve this problem.

[0006]

The invention according to claim 1 is
A beam projector 4 pivotally supported by a pivoting means 5 in a cylindrical case 1 appropriately provided with a plurality of support legs 2;
A blackout device comprising a battery 7 for a beam power source and projecting the beam 10 from the projector 4 to the outside through a window 13 provided in the case 1 as shown in FIG. A power switch opening / closing operation lever 16 is provided so as to protrude out of the case 1 so as to be rotatable between an on position and an off position, and when the lever 16 is in the off position, the power switch is opened and the beam is opened. A switch opening / closing / projector locking mechanism 17 for locking the projector 4 in a fixed position and closing the power switch when the lever 16 is turned to the ON position and unlocking the beam projector 4 is provided in the case 1. It is characterized in that it is provided in conjunction with the lever 16.

According to a second aspect of the present invention, in the blackout device according to the first aspect, as shown in FIG. 2, the switch opening / closing / projector locking mechanism 17 includes an operating rod 2 having one end pivotally mounted.
0, a spring 21 that presses the operating rod 20 against the side surface of the beam projector 4 and urges the beam projector 4 so as to lock the beam projector 4 at a fixed position, and a side opposite to the beam projector 4 with the operating rod 20 interposed therebetween. Power switch limit switch 1
8 and the pivot 22 of the power switch opening / closing operation lever 16
When the lever 16 is in the off position, the operating rod 20 is not pressed and the projector lock state and the limit switch open state are maintained, and when the lever 16 is turned to the on position, the operating rod is turned on. And a cam 23 that operates to press the spring 20 against the spring 21 to close the limit switch 18 while releasing the lock state.

According to a third aspect of the present invention, in the blackout device according to the second aspect, the open / close operation lever 1 for the power switch is provided.
6 is provided so as to protrude from the lower surface of the bottom wall 1c of the cylindrical case 1.

According to a fourth aspect of the present invention, in the blackout device according to any one of the first to third aspects, the lower end surface of the beam projector 4 stopped at a vertical position faces the lower end surface with an appropriate gap. A magnetic braking means 27 is provided between the cylindrical case 1 and the upper surface of the bottom wall 1c.

According to a fifth aspect of the present invention, in the blackout device according to the fourth aspect, the magnetic braking means 27 includes the conductive weight 15 provided at the lower end of the beam projector 4 and the cylindrical case. A plurality of magnet pieces 28 arranged at regular intervals in the circumferential direction so as to concentrically surround the central axis P of the beam projector 4 stopped at a vertical position on the upper surface of the bottom wall portion 1c;
It is characterized by consisting of.

According to a sixth aspect of the present invention, in the ink marking device according to any one of the first to fifth aspects, as shown in FIG. A gyro mechanism 30 is interposed between an upper end of the beam projector 4 disposed at a position eccentric from the center and a horseshoe-shaped support 29 fixed at a position surrounding the upper end of the beam projector. The horseshoe-shaped support body 29 is characterized in that the horseshoe-shaped opening end surface side 29a is disposed close to the inner peripheral surface of the case 1.

According to a seventh aspect of the present invention, in the inking device according to the sixth aspect, as shown in FIGS. 8 and 9, the horseshoe-shaped support 29 stands on the case with cushioning members 37a and 37b interposed therebetween. It is characterized in that it is attached to a support 35 provided.

According to an eighth aspect of the present invention, in the blackout device according to any one of the first to seventh aspects, as shown in FIG. 1, the beam of the beam projector 4 is projected from the case 1 to the outside. The dustproof glass 14 is attached to the case opening.

[0014]

FIG. 1 is a longitudinal sectional view showing a black-out device according to the present invention, FIG. 2 is a sectional view taken along line XX of FIG. 1, FIG. 3 is a bottom view of the black-out device shown in FIG. FIG. 4 is a sectional view taken along line YY of FIG. In these figures, reference numeral 1 denotes a cylindrical case, which has a cylindrical body 1a, a lid 1b removably fitted to the upper end of the body 1a, and fitted and fixed to the lower end of the body 1a. Bottom wall 1c, three legs 2 are attached to the outer periphery of the lower surface of the bottom wall 1c at regular intervals in the circumferential direction, and a bubble level 3 is provided at the center of the lid 1b. It is attached.

In the case 1, a cylindrical beam projector 4 is pivotally supported by a pivoting means 5 so as to be swingable. A cylindrical battery housing 6 is provided beside the beam projector 4. In addition, a battery 7 for beam power is stored in the storage section 6. As can be seen from FIG. 1 and the like, the beam projector 4 is disposed at a position eccentric from the center axis O of the case 1 by a considerable distance and close to the inner peripheral wall surface of the case 1. 6 are arranged on both sides in the diameter direction in the case 1.

As shown in FIG. 1, the beam projector 4 has a cylindrical body 4a, and a central axis P inside the body 4a.
A laser diode 8 for a light source and a light collimating lens 9 are provided above the laser diode 8. A laser beam 10 emitted from the diode 8 passes through the light collimating lens 9 along the central axis P and passes therethrough. Is projected to A reflecting mirror 11 and a rod lens (rod-shaped lens) 12 as a beam line emitting lens are attached to the upper end of the body 4a. The laser beam 10 passing through the lens 9 from the diode 8 is reflected by the reflecting mirror 11. Then, the light enters the rod lens 12 and is refracted outwardly in the radial direction by the rod lens 12 in a diffused manner, and is projected to the outside from a vertically long slit-shaped window 13 provided in the cylindrical case 1. I have.
A conductive weight 15 formed of a copper material is concentrically connected to a lower end of the cylindrical body 4 a of the beam projector 4. The diode 8 is connected to the beam power battery 7 together with an IC circuit (not shown). As shown in FIG. 6, the window 13 is formed in a slit shape from the upper end of the cylindrical body 1a to the lid 1b.
A dustproof glass 14 is attached inside the window 13.

As shown in FIGS. 1 to 3, the tubular case 1 has a power switch opening / closing operation lever 16 provided with a bottom wall 1c.
When the lever 16 is in the off (OFF) position, the power switch limit switch 18 is opened when the lever 16 is in the off (OFF) position. And a switch opening / closing and projector locking mechanism 1 for closing the power switch and unlocking the beam projector 4 when the beam projector 4 is locked in a fixed position and the lever 16 is turned to an ON (ON) position.
7 is provided in the case 1 in conjunction with the lever 16.

The switch opening / closing and projector locking mechanism 17
Is provided inside the case 1 and, as shown in FIG.
c, which is rotatably attached to the operating rod 20 and the operating rod 2
0 is pressed against the side surface of the lower end of the beam projector 4 to urge the beam projector 4 to be locked at a fixed position, and a helical spring 21 is installed on the opposite side to the beam projector 4 with the operating rod 20 interposed therebetween. Power switch limit switch 18
And the limit switch 18 with the operating rod 20 interposed therebetween.
Is provided on the pivot 22 of the power switch opening / closing operation lever 16 at a position opposite to that of the power switch.
F) When in the position, the operating rod 20 is not pressed, and the lever 1
And a cam 23 that operates to push the operating rod 20 against the helical spring 21 to release the lock when the 6 is turned to the ON position and to close the limit switch 18. .

The helical spring 21 is, as shown in FIG.
One end is fixed to a fixed shaft 24 protruding from the bottom wall 1c of the case 1 and the other end is wound around the pivot pin 19, and always pushes the operating rod 20 toward the beam projector 4 side. Acts to move. In addition, limit switch 18
Has a kick bar 18a which is normally urged to open the switch by a spring (not shown), so that the power switch opening / closing operation lever 16 is turned on as shown by the solid line in FIG. And the cam 23 moves the operating rod 2
By pushing 0 against the helical spring 21, the kick bar 18a is pressed to close the switch and turn on, and the lever 16 is moved to the off position as shown by the phantom line in FIG. By releasing the pressing force on the operating rod 20 by the action of the cam 23, the kick bar 18a is released as shown by the imaginary line in the same figure, and the switch is opened to turn off. . In FIG. 3, S1 and S2 indicate the turning of the power switch opening / closing operation lever 16 to the ON (ON) position and the OFF (OFF) position.
A stopper for restricting between the position and the bottom wall 1c
Protruding from the lower surface of the.

As shown in FIGS. 1 and 5, the bottomed short cylindrical body 2 having a low height is provided on the upper surface of the bottom wall 1c of the case 1.
5 is fixed concentrically with the center axis P of the beam projector 4 stopped at the vertical position. The cylindrical body 25 has a peripheral wall 25a having a diameter sufficiently larger than the diameter of the beam projector 4, and the lower end of the beam projector 4 always projects into the peripheral wall 25a. The large swing of the beam projector 4 is limited by the inner diameter of the peripheral wall 25a. When the power switch opening / closing operation lever 16 is located at the OFF position, the beam projector 4 moves the operating rod 20 as shown by the phantom line in FIG.
And the inner peripheral surface of the peripheral wall 25a (fixed position).
And will be locked. An O-ring 26 is attached to the outer peripheral surface of the lower end of the beam projector 4, that is, the conductive weight 15 made of copper, so as to reduce an impact when the inner peripheral surface of the peripheral wall 25 a is hit. I am trying to do it.

A magnetic braking means 27 is provided between the lower end surface of the beam projector 4 stopped at the vertical position and the upper surface of the bottom wall portion 1c of the cylindrical case 1 which forms an appropriate gap and faces the lower end surface. Is provided. As shown in FIGS. 1, 2 and 5, the magnetic braking means 27 includes a conductive weight 15 provided at a lower end of the beam projector 4 and a bottom surface of the bottomed cylindrical body 25. It consists of a plurality of magnet pieces 28 arranged at regular intervals in the circumferential direction so as to concentrically surround the central axis P of the beam projector 4 stopped at the vertical position, and these magnet pieces 28 are As shown in FIG. 5, N is placed on the upper surface between magnet pieces adjacent in the circumferential direction.
The poles and the S poles are arranged so as to appear alternately.

The magnetic braking means 27 is provided with a braking force generated by an eddy current generated inside the case by the movement of the conductive weight 15 with respect to the magnet piece 28 provided on the bottom wall 1c side of the case 1. Although the beam projector 4 is stopped using (braking force), the magnetic braking means 27 is provided by the conductive weight portion provided at the lower end of the beam projector 4 as described above. 15 and a plurality of magnet pieces 28 disposed on the upper surface of the bottom wall 1c of the case 1 facing the main body 1 with an appropriate gap formed therebetween. Since the braking force due to the eddy current acts on the position where the self-weight and the weight of the conductive weight portion 15 are to be stopped, the braking force and the own weight of the beam projector 4 and the conductive weight portion 15 cause the braking force. By the synergistic action of self damping force to be stopped, it is possible to beam projector 4 good balance as soon as possible to rest.

On the other hand, as shown in FIGS. 1 and 4, the pivot means 5 comprises an upper end 4b of the beam projector 4 disposed at a position eccentric from the center of the cylindrical case 1, and this beam projector 4 A gyroscopic mechanism 30 interposed between a flat, substantially U-shaped, or horseshoe-shaped support 29 disposed and fixed so as to surround the upper end 4b of the support 4;
9 is a horseshoe-shaped open end face side 29 as can be seen from FIG.
a is disposed so as to approach the inner peripheral surface of the cylindrical case 1. The gyro mechanism 30 is configured such that the upper end portion 4b of the beam projector 4 is attached to a ring member 31 disposed between the upper end portion 4b and the horseshoe-shaped support 29.
The pin member 33 is rotatably supported around a first axis 32a extending in the diameter direction of the
Is extended in the diameter direction of the ring member 30 with respect to the horseshoe-shaped support 29 and is rotatably supported by a pivot pin 34 around a second axis 32b orthogonal to the first axis 32a. The projector 4 can swing freely in all circumferential directions and can be suspended vertically by its own weight.

The horseshoe-shaped support 29 is attached by bolts 36 to the upper ends of two pillars 35 vertically erected on the bottom wall 1c of the case 1. At this time, FIG.
And a cushioning material 3 such as a stepped ring-shaped rubber as shown in FIG.
Mounting holes 38 penetrating 7a, 37b through horseshoe-shaped support 29
, From above and below, and a bolt 36 is inserted through it and screwed into the support 35. The bolt 36
Is properly loosened by a lock screw 39 screwed from the side surface of the support post 35, and the bolt head 36a and the cushioning material 3
7a is interposed between the washer 40.

As described above, the pivot means 5 is constituted by the gyro mechanism 30 interposed between the upper end 4b of the beam projector 4 and the horseshoe-shaped support 29 surrounding the upper end 4b of the projector. At the same time, by disposing the support 29 such that the horseshoe-shaped opening end surface side 29a is close to the inner peripheral surface of the case 1, the beam projector 4 is moved from the center of the case 1 to the inner peripheral surface thereof. It can be provided at a position deviated as much as possible, whereby the projector 4 and the battery accommodating section 6 can be effectively accommodated in the case 1, and the diameter of the case 1 can be reduced.
While the size of the blackout device can be reduced, the distance from the upper end of the beam projector 4 to the slit-shaped window 13 of the case 1 can be made as short as possible and the width thereof can be made small, so that the dustproof glass 14 can be easily installed. Thus, dust resistance can be improved. In addition, shielding plates 14a (FIG. 1) made of glass or resin are attached to both side surfaces of the dustproof glass 14 so as to prevent dust from entering from the side surfaces.

The horseshoe-shaped support 29 is provided with cushioning members 37a, 3a.
7b, the impact force transmitted from the case 1 to the support 29 via the support 35 is reduced by the cushioning members 37a, 37b, and is supported by the support 29. The gyro mechanism 30 can be stably used for a long time without being damaged by an unexpectedly strong impact force.

FIG. 6 shows a state in which a U-shaped handle 41 is provided at the upper end of the case 1. Both ends of the handle 41 are supported by support shafts 42 protruding from both sides of the upper end of the body 1 a of the case 1. , 4
2 so as to be pivotable.

When using the black-out device having the above-described configuration, the black-out device is placed at a required position on the floor F in the room where the black-out is performed as shown in FIG. By turning the lever 16 from the off (OFF) position shown in FIGS. 2 and 3 to the on (ON) position, the power switch is turned on and the beam projector 4 is turned on.
The laser beam 10 emitted from the laser diode 8 in the inside and passed through the window 13 is projected over the floor surface F, the indoor wall surface H, and the ceiling surface T as shown in FIG. 8, and a series of beam lines along the vertical plane BL is formed. This beam line B
L can be used to perform a blackout operation such as centering.

In the blackout device exemplified here, the rod lens 12 as a beam line light-emitting lens is mounted horizontally on the upper end of the beam projector 4, so that the beam line BL is in a vertical plane as described above. However, when the rod lens 12 is attached vertically along the axial direction of the beam projector 4, the beam line BL can be formed horizontally on the indoor wall surface H.

When the opening / closing operation lever 16 is turned to the ON (ON) position in use of the blackout device, the power switch is turned on, and at the same time, the lock of the beam projector 4 by the operating rod 20 is released. The beam projector 4 has a magnetic braking means 27 comprising a conductive weight 15 at the lower end thereof and a plurality of magnet pieces 28 facing the lower end thereof.
Can be stopped at the vertical position as soon as possible. Further, when the opening and closing operation lever 16 is turned to the OFF (OFF) position after the use of the blackout device, the power switch is turned off and the beam projector 4 is locked in the fixed position by the operating rod 20 at the same time. When the ink ejection device is carried or the like, the beam projector 4 does not rattle or inconveniencely vibrate, and when the opening / closing operation lever 16 is in the off position, the operating rod 20 turns the beam projector 4 by the helical spring 21. Since it is pressed against the lock side, it is possible to prevent an unexpected situation in which the operating rod 20 unexpectedly closes the limit switch 18 due to vibration or the like at the time of carrying the apparatus or the like, that is, the ON state is turned on. is there.

[0031]

According to the first aspect of the present invention, the open / close operation lever for the power switch is rotatably provided between the ON position and the OFF position, and the power switch is opened when the lever is at the OFF position. And locking the beam projector at a fixed position, providing a switch opening / closing and projector locking mechanism for closing the power switch and unlocking the beam projector when the lever is turned to the on position in conjunction with the lever. Therefore, the power switch can be turned on and off, the beam projector can be prevented from swinging and swinging open to the vertical position, that is, the locking and unlocking of the projector can be operated with a single operation with a single operation lever. It is convenient. When the lever is turned on, the power switch is turned on to activate the beam projector, and when the lever is turned off, the power switch is turned off,
The beam projector can be locked in a fixed position, so that it is very safe without the possibility that the beam projector will be damaged by vibrations or impair the accuracy when carrying the apparatus. In addition, the power switch opening / closing operation lever is rotatable between the ON position and the OFF position with only this lever protruding out of the case, so that the dustproofness is improved.

According to the switch opening / closing / projector locking mechanism according to the second aspect of the present invention, the structure is simple and easy to manufacture, and when the power switch opening / closing operation lever is in the off position, the switch is activated. Since the rod is pressed by the spring to the side that locks the beam projector, an unexpected situation such as that the operating rod closes the limit switch and the power switch is turned on due to vibration etc. when carrying the device etc. Occurrence can be prevented.

In the case where the open / close operation lever for the power switch is provided so as to protrude from the lower surface of the bottom wall of the cylindrical case as in the invention according to claim 3, the protrusion (lever) is provided at the lower part of the case. Since it is hidden, the appearance on the external fitting is improved, and the dustproofness is further improved.

According to the fourth aspect of the present invention, the magnetic braking means is provided between the lower end surface of the beam projector stopped at the vertical position and the upper surface of the bottom wall portion of the cylindrical case facing with an appropriate gap. Is provided, a braking force due to the eddy current is applied to a position where the beam projector tends to stop under its own weight, so that the beam projector can be stopped as soon as possible in a well-balanced manner.

According to a fifth aspect of the present invention, the magnetic braking means comprises: a conductive weight portion provided at a lower end portion of the beam projector;
If it is composed of a plurality of magnet pieces arranged at regular intervals in the circumferential direction so as to concentrically surround the central axis of the beam projector on the upper surface of the case bottom wall, the conductive portion at the lower end of the beam projector is a weight. In addition to the above, the self-stopping force of the beam projector works effectively, and the arrangement of the magnet pieces as described above effectively works the braking force due to the eddy current, thereby further improving the braking effect of the beam projector.

According to the sixth aspect of the present invention, the pivot means is provided at the upper end of the beam projector disposed at a position eccentric from the center in the cylindrical case, and at the position surrounding the upper end of the projector. A gyro mechanism interposed between a horseshoe-shaped support fixed to the beam-projector, and the beam projector is arranged such that the open end face side of the horseshoe-shaped support is disposed close to the inner peripheral surface of the case. Can be provided at a position deviated as much as possible from the center of the case toward the inner peripheral surface thereof, whereby the projector and the battery storage can be effectively stored in the case, and the diameter of the case can be reduced, While the size of the blackout device can be reduced, the distance from the beam line light emitting lens of the beam projector to the window provided in the case can be made as short as possible and the width thereof can be formed as small as possible. Dustproof It is possible to increase.

According to the seventh aspect of the present invention, the horseshoe-shaped support is attached to the support standing upright on the case via the cushioning material, so that the impact force transmitted from the case to the support via the support is provided. The gyro mechanism supported by the support body can be stably used for a long period of time without being damaged by an unexpectedly strong impact force.

According to the eighth aspect of the present invention, since the dust-proof glass is attached to the case opening for projecting the beam of the beam projector from the case to the outside, it is ensured that dust and the like enter the inside of the case. It can be prevented and used stably.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a blackout device according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a bottom view of the blackout device shown in FIG. 1;

FIG. 4 is a sectional view taken along line YY of FIG. 1;

FIG. 5 is an explanatory perspective view showing a magnetic braking unit.

FIG. 6 is a front view of the marking device with a handle attached to the upper end of the case.

FIG. 7 is a sectional view taken along the line ZZ of FIG. 6;

FIG. 8 is a longitudinal sectional view showing a structure for attaching a horseshoe-shaped support to a support.

FIG. 9 is a perspective view showing the cushioning material as the attachment part.

FIG. 10 is a perspective view showing an example of use of a blackout device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylindrical case 2 Support leg 4 Beam projector 5 Pivot means 6 Battery storage part 7 Battery 9 Light parallel lens 10 Leather beam 11 Reflecting mirror 12 Rod lens (beam line light emitting lens) 13 Window 14 Dustproof glass 15 Conductive weight Part 16 Opening / closing operation lever for power switch 17 Switch opening / closing / projector locking mechanism 18 Limit switch 20 Operating rod 21 String spring 23 Cam 27 Magnetic braking means 28 Magnet piece 29 Horseshoe-shaped support 37a Buffer material 37b Buffer material

Claims (8)

[Claims] 1. A window in which a beam projecting device pivotally supported by a pivoting means and a battery for a beam power source are provided in a cylindrical case, and a beam from the projecting device is provided in the case. In a blackout device designed to project from the outside to the outside, an open / close operation lever for a power switch is provided so as to protrude out of the case so as to be rotatable between an on position and an off position, and the lever is turned off. When the lever is turned to the on position, the power switch is opened and the power switch is closed and the beam projector is unlocked when the lever is turned to the on position. A marking device provided in the case in conjunction with the lever. 2. The switch opening / closing / projector locking mechanism includes an operating rod having one end pivotally connected thereto, and biasing the operating rod against a side surface of the beam projector to lock the beam projector at a fixed position. And a power switch limit switch provided on the opposite side of the beam projector with the operating rod interposed therebetween, and a power switch open / close operation lever provided at a pivot portion thereof, and actuated when the lever is in an off position. When the lever is turned to the ON position, the operating rod is pressed against the spring and the limit switch is closed with the release of the locked state when the lever is turned to the ON position without pressing the rod. 2. The ink marking device according to claim 1, further comprising a cam operable to move. 3. The open / close operation lever for a power switch,
The ink marking device according to claim 2, wherein the device is provided so as to protrude from a lower surface of a bottom wall portion of the cylindrical case. 4. A magnetic braking means is provided between a lower end surface of a beam projector stopped at a vertical position and an upper surface of a bottom wall portion of a cylindrical case facing with an appropriate gap. The blackout device according to claim 1. 5. The magnetic braking means includes a conductive weight provided at a lower end of the beam projector, and a center axis of the beam projector stopped at a vertical position on an upper surface of a bottom wall of the cylindrical case. 5. The ink marking device according to claim 4, comprising a plurality of magnet pieces arranged concentrically at regular intervals in the circumferential direction. 6. The support means comprises an upper end of a beam projector disposed at a position eccentric from a center in the cylindrical case, and a horseshoe-shaped support fixed at a position surrounding the upper end of the beam projector. It consists of a gyro mechanism interposed between the body and
The ink marking device according to any one of claims 1 to 5, wherein the support member is arranged such that a horseshoe-shaped opening end surface side is close to an inner peripheral surface of the case. 7. The ink-marking device according to claim 6, wherein the horseshoe-shaped support is attached to a column erected on a case via a cushioning material. 8. The blackout device according to claim 1, wherein a dustproof glass is attached to a case opening for projecting a beam of the beam projector from the case to the outside.