JP2009274227A - Blackboard eraser cleaning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blackboard eraser cleaning device which can solve such trouble that it generates a loud noise during a cleaning operation of a blackboard eraser due to a compact structure incorporating a suction part and a negative pressure device in one piece as seen in a conventional blackboard eraser cleaner, and therefore, a teacher is obliged to suspend classroom lesson due to the noise so that teaching efficiency cannot be maintained, although he/she tries to continue the lesson by addressing students while wiping the blackboard. <P>SOLUTION: This blackboard eraser cleaning device includes: the suction part which has a slit and can be installed in close proximity to the blackboard; a negative pressure device installed near a floor surface; a suction pipe for connecting the suction part with the negative pressure device; a dust collecting filter installed in the negative pressure device; and a soundproof box for covering the circumference of the negative pressure device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a blackboard wiping cleaning device that does not interfere with classes.

Currently, blackboards and chalk-based blackboards are often used in schools and other educational settings, and blackboard wipes are frequently used to wipe letters written on blackboards. As a result, the chalk wipes immediately adhere to the chalk powder, reducing the ability to wipe off the letters, and the chalk powder adhering to the scatter will be healthy for students and students listening to the class, as well as the teachers who teach the class. There is a risk of adverse effects on the above.
Therefore, since it is necessary to remove the chalk powder adhering to the blackboard wiper, a blackboard wiper cleaner is used. However, the blackboard wiping cleaner that is currently used generally includes a suction portion that sucks chalk powder from the blackboard wipe and a negative pressure device that generates an air flow in the suction portion. Further, these blackboard wiping cleaners are mostly formed of a thin synthetic resin plate or the like in order to be light and compact so that they can be easily carried. For this reason, since measures against noise and vibration generated from the negative pressure device are hardly taken, it is general that large noise is generated from the blackboard wiping cleaner.
Therefore, if the blackboard wiper cleaner used in the past was activated during the class, it was almost impossible to stop the class because a considerable amount of noise was generated. This disrupts the concentration of students and students listening to the lesson and significantly reduces the efficiency of the lesson. Therefore, teachers who place importance on continuity of the class will continue to use dirty blackboard wipes, chalk removal from the blackboard is not enough, it becomes difficult to see the letters written on the blackboard, chalk dust The students, students, and themselves were supposed to be placed in a non-hygienic environment where classes continued while scattering chalk dust from a dirty blackboard wipe.

  The blackboard wipe immediately becomes dirty with chalk powder, which may result in insufficient erasure of characters from the blackboard, or sprinkling chalk powder into an unhygienic environment. A method has been devised to facilitate removal. For example, there is a method of always generating a strong suction force by connecting a blackboard wiper with a vacuum container. According to this method, when the blackboard wipe is pressed against the blackboard, the solenoid valve opens, the negative pressure of the vacuum container acts, and the chalk powder wiped from the blackboard by the blackboard wipe can be immediately sucked into the vacuum container So you can always keep the blackboard wipe clean. (See Patent Document 1)

  Also, since the blackboard wiper cleaner is usually placed in the corner of the classroom, etc., the blackboard wiper cleaner is structurally used in contrast to the fact that the blackboard wiper cleaner was used after moving to the corner of the classroom during class. The one that is integrated into the devise is also devised. (See Patent Document 2 and Patent Document 3)

JP-A-6-239096 JP2002-59688 JP 2000-43482 A

  As described above, when a generally used blackboard wiping cleaner is operated, a large noise is generated and the class is interrupted. In addition, the blackboard wiper connected to the vacuum container with a hose and capable of cleaning the blackboard wiper at any time has a drawback that the blackboard wiper is connected to the hose and is difficult to handle. The blackboard cleaning cleaner integrated with the blackboard could not eliminate the disadvantage of noise.

An object of the present invention is to prevent the generation of a large noise in cleaning a blackboard wipe, and to prevent the blackboard wipe from being connected to a hose so as to be difficult to use so that the blackboard wipe can be easily cleaned even during class.

In order to achieve the above object, the blackboard wiping cleaning device according to claim 1 is close to the side of the blackboard and separated from the blackboard with a suction portion having a slit installed within a substantially range of the height of the blackboard. It consists of a negative pressure device provided near the floor, a suction pipe connecting the suction part and the negative pressure device, a dust collecting filter installed in the negative pressure device, and a soundproof box covering the periphery of the negative pressure device. ing.

In the blackboard wiping cleaning device according to claim 1 of the present invention, the suction part is close to the side part of the blackboard that performs the blackboard wiping work, and is within the approximate range of the height of the blackboard, and during the work of wiping the blackboard Easily approach the cleaning device to perform cleaning work, and at the same time, the negative pressure device is not integrated with the suction part, but near the floor surface away from the blackboard and the surroundings are covered with a soundproof box etc. to reduce noise Has an effect.

  The best mode of the blackboard cleaning apparatus according to the present invention will be described below with reference to FIGS.

Embodiment 1 of the present invention will be described with reference to FIGS. 1, 2, 3, and 4. FIG. FIG. 1 is an overview of the first embodiment. In the figure, the blackboard 1 is installed in a classroom, and the suction part 2 is on the wall surface close to the side of the blackboard, and the height of a human eye (1.4 m to 1.m) within the approximate range of the height of the blackboard . 8m). The suction part 2 is provided with a slit 3 for cleaning the blackboard wipe, and is connected to the suction body 6 by a suction pipe 5. The suction body 6 is installed on the classroom floor, but is placed close to the wall at the corner of the classroom away from the blackboard . If the platform is placed in front of the blackboard 1, the height of the suction unit 2 is the position of the human eye when standing on the platform, and the suction body 6 is not on the platform, It is desirable to be placed on the floor. However, the suction body 6 may be placed on the platform, inside the platform, or outside the classroom. Note that the suction unit 2 may be located at a place other than the side near the side of the blackboard. The reason why the suction part 2 is placed at the height of the line of sight is that teachers often talk to students while wiping the blackboard with a blackboard wipe, and cleaning the blackboard wipe in such a posture makes it easier to keep talking This is because it is easy to continue the lesson, so that it will be the height of blackboard wipe when performing blackboard wipe work.

  FIG. 2 is an overview of the suction unit 2 in the first embodiment. In the drawing, the suction part 2 is composed of a sealed suction box 7 having a suction cover 8 for sliding the blackboard wiper left and right on the surface as one of the constituent elements. A longitudinally long slit 3 is provided in the center of the suction cover 8 in the left-right direction, and air is sucked from the slit 3. The suction box 7 is connected to the suction body 6 by the suction pipe 5, and air flows from the slit 3 due to the negative pressure generated in the suction body 6, and the air is guided to the suction body 6 through the suction pipe 5. In addition, a magnetic sensor 4 is provided on the back surface of the suction cover 8 to detect the approach of blackboard wiping and to activate the blackboard wiping cleaning device. The magnetic sensor 4 may be anything as long as it detects the approach of blackboard wiping. In addition to wiping the blackboard, a human approach may be detected. Further, it may be pressed by wiping the blackboard, or may be operated by a human hand to turn on the switch to bring the blackboard wiping cleaning device into an operating state. Note that a plurality of slits may be provided, and the direction thereof may be any direction or may be a combination of slits having different directions. The suction box is not necessarily box-shaped, and any shape can be used as long as it can create a sealed state.

  FIG. 3 is a cross-sectional view of the suction body 6 in the first embodiment. The suction body 6 includes a negative pressure device 10 and a soundproof box 11 that covers the negative pressure device 10. A soundproof member 12 is attached to the inner surface of the soundproof box 11. In the negative pressure device 10, the blower 17 sucks air from the suction part 2 through the suction pipe 5. The suction pipe 5 is connected to the chalk dust reservoir 13 of the negative pressure device through the wall of the soundproof box 11, and the air flowing into the chalk dust reservoir 13 through the suction pipe 5 is collected inside the chalk dust reservoir 13. It flows to the blower 17 through the dust filter 16. The air that has passed through the blower 17 passes through the negative pressure device exhaust port 18 and is discharged to the outside through the soundproof box exhaust port 19 provided in the soundproof box 11, but the flow is prevented by the exhaust port cover 20 provided in the soundproof box. The direction can be changed downward. The soundproof box 11 is connected to the outside air through the soundproof box exhaust port 19, but the area of the soundproof box exhaust port is minimized so that the noise from the negative pressure device is not leaked as much as possible. It is preferable to provide an exhaust port cover so as to reduce the influence of noise from the air or to provide a soundproof box exhaust port in a direction to reduce the influence of noise. The soundproof member 12 may not necessarily cover the entire surface of the soundproof box.

FIG. 4 is an overview of the blackboard wipe 31 in the first embodiment. The blackboard wipe 31 has a base 33 provided with a wiper 34 for wiping chalk from the blackboard, and the base 33 is provided with a blackboard wiper 32 for inserting a hand. A magnet 35 is attached to the back surface of the base 33 inside the wiping portion 34.

Next, an operation method of the first embodiment will be described. The teacher who was writing on the blackboard 1 in the classroom is talking to the students while using the blackboard wipe 31 to wipe off the chalk on the blackboard. Since the blackboard wipe 31 has become dirty with chalk powder, the teacher holds the blackboard wipe 31 and moves in front of the suction unit 2 to bring the blackboard wipe closer to the suction cover 8. Then, the magnetic sensor 4 in the suction part 2 detects the magnetism by the magnetic force from the magnet 35 in the blackboard wipe 31, the power of the blower 17 in the suction body 6 is turned on, and air suction starts. Is done. Then, air flows in from the slit 3 of the suction part 2 connected by the suction pipe 5. The teacher presses the wiping portion 34 of the blackboard wiping 31 against the slit 3 and moves it to the left and right to suck the chalk powder adhering to the wiping portion 34 through the slit 3 and clean the wiping portion 34.

During such operation, noise is generated from the negative pressure device 10, but the negative pressure device 10 is housed in a soundproof box 11 having a soundproof member 12 disposed around it, and the generated noise leaks to the outside. Therefore, noise leaking from the suction body 6 to the outside is reduced. Noise is also generated by the air flowing in from the slit 3 of the suction part 2, but the combined noise can be reduced far more than the conventionally used blackboard wiping cleaner. Further, since the suction part 3 is arranged on the wall surface close to the side part of the blackboard 1 and at the height of the line of sight within the approximate range of the blackboard height , the teacher wipes the blackboard 31 in the same posture as the work of the teacher wiping the blackboard. The teacher can continue talking to the students during the cleaning work. Therefore, the lesson is not interrupted, an efficient lesson can be performed, and the present invention can be said to be a blackboard wiping cleaning device that is kind to both students and teachers.

Noise reduction has been confirmed by noise experiments and will be explained. What was used for the experiment was a conventional blackboard wiping cleaner (made by a certain stationery maker, rated voltage 100 V, rated output 320 W), and a commercially available vacuum cleaner (made by a certain consumer electronics manufacturer, rated voltage 100 V, The blackboard wiping cleaning device of the present invention using a rated output of 650 W and a suction work amount of 200 W). The soundproof box constituting the suction body is made of a vinyl chloride plate having a thickness of 10 mm, and the suction portion is made of a vinyl chloride plate having a thickness of 5 mm. The experiment was performed using four types of suction portions having different slit shapes. S1 is a single slit with no chamfering, and s1m is a chamfered with one slit. Further, s2m is chamfered with two slits, and s3 is a combination of s2m and s1. The size of the slit is 5 mm × 300 mm. The results of the experiment are shown in Table 1. The unit is decibel (dB), and the values in parentheses are noises during the cleaning operation using the blackboard wiper.

As a result of the experiment, compared with the conventionally used blackboard wiping cleaner, the noise reduction effect is remarkably recognized in the present invention, but the number of slits provided in the suction part greatly affects the degree of the noise reduction effect. I understand. From this, it is found that in the present invention, the noise from the suction portion is more greatly affected than the noise from the suction body. Accordingly, when comparing the noise at a distance of 1 m from the suction part, the noise 81 dB of the conventional cleaner was chamfered in the chamfered slit 1 of the present invention in a state where the blackboard wipe was not applied to the slit of the suction part while the apparatus was started. It can be seen that this is reduced by 16 decibels to 65 decibels, and two chamfered slits are reduced by 20 decibels to 61 decibels. In addition, the chamfering effect of the slit is slightly seen compared with the case of one slit without chamfering. In addition, the noise reduction effect of the three slits is not much different from that of the two slits, but the suction force is greatly reduced, and the ability to clean the blackboard wipe is reduced, which seems to be less practical. Next, when the blackboard wipe is applied to the slit and the actual cleaning operation is performed, compared with the conventional cleaner which generates noise of 84 decibels, one chamfered slit of the present invention reduces by 14 decibels by 70. With 2 decibels and chamfered slits, it becomes 67 decibels, which is 17 decibels lower.

Next, when comparing noise at a distance of 4 m from the suction part, the noise 71 dB of the conventional cleaner was chamfered according to the present invention in a state where the blackboard wipe was not applied to the slit of the suction part while the apparatus was started. One is reduced by 11 dB to 60 dB, and two chamfered slits are reduced by 14 dB to 57 dB. Next, when the blackboard wipe is applied to the slit and compared with the actual cleaning operation, the conventional cleaner generates a noise of 72 dB, and the single chamfered slit of the present invention reduces 64 dB by 64 dB. With two chamfered slits, the decibel becomes 60 decibels, a decrease of 12 decibels.
By the way, as for the level of noise, 80 dB is the noise in the train, 70 dB is a noisy office, and 60 dB is normal conversation. It can be seen from the experimental results that the blackboard wiping cleaning device of the present invention has a remarkable noise reduction effect when it has two chamfered slits. Noise at a distance of 1 m corresponding to the position of the student sitting in the seat closest to the suction section as a noise source is 81 decibels equivalent to or greater than that in the train of a conventional cleaner when the device is started However, in the case of the two slits having the chamfer of the present invention, it becomes a normal conversation or a noise of 61 dB of a level slightly higher than that, and when cleaning with a blackboard wipe, While the noise is 84 decibels, which is much higher than the noise, the two slits having the chamfer of the present invention make noise closer to a noisy office than ordinary conversation, but in the present invention, the suction force is conventional. Because it is larger than the cleaner, the cleaning work can be completed in just a few seconds. In addition, the teacher is near the suction section and the teacher's voice is easy to hear. It can be seen that does not affect the extent must be cross-sectional. In this manner, the conventional cleaner generates a noise that interrupts the class, but in the case of the suction part having two slits having the chamfer of the present invention, the blackboard wiping operation is performed. It was proved that the noise level did not need to be interrupted.

The blackboard wiping cleaning device of the present invention sucks and removes chalk powder, which is accumulated in the chalk powder reservoir 13 in the vacuum device 10. If a large amount of this is accumulated, the dust collecting filter 16 is clogged and the suction force is reduced. Therefore, it is necessary to sometimes remove the chalk dust in the chalk dust reservoir 13. The soundproof box 11 of the suction body 6 has a soundproof box cover 21 and is fixed to the soundproof box 11 by a fixing device (not shown). When cleaning the chalk powder, the fixing device is removed and the soundproof box cover 21 is removed by the soundproof box handle 22. Then, the chalk powder reservoir 13 built in the vacuum device 10 is pulled out by grasping the chalk dust reservoir handle 14 provided on the chalk dust reservoir cover 15. The chalk dust cover 15 is fixed by a chalk dust reservoir and a fixing device (not shown), but the chalk dust reservoir cover 15 is opened by removing the fixing device and the chalk dust accumulated in the chalk dust reservoir 13 is removed. Remove. In this way, the chalk dust in the chalk dust reservoir 13 is sometimes removed so that the blackboard wiping cleaning device maintains an appropriate suction force.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is an overview of the second embodiment. The blackboard 1 is installed in the classroom, and is sucked to the height of the human eye (approximately 1.4m to 1.8m) within the approximate range of the blackboard height on the wall near the blackboard outside the both ends of the blackboard. Portions 2a and 2b are provided. The suction portions 2a and 2b are provided with slits 3a and 3b with opening / closing devices, and are connected to the suction body 6 by suction tubes 5a and 5b. The suction body 6 is installed on the classroom floor, but is placed close to the wall at the corner of the classroom away from the blackboard . When the platform is placed in front of the blackboard 1, the heights of the suction parts 2a and 2b are the positions of the human eyes when standing on the platform, and the suction body 6 is on the platform. However, it is desirable to place it on the floor as in the first embodiment. Also, the suction body 6 may be placed on the platform or may be other than the first embodiment. The reason for placing the suction portions 22a and 2b at the height of the line of sight is the same as described in the first aspect.

The opening / closing device provided in the slits 3a and 3b of the suction portions 2a and 2b will be described with reference to FIG. FIG. 6 is a perspective view showing a cross section of the switchgear.
The suction cover 8a has a slit 3a, and an opening plate 40 having an area larger than that of the slit 3a is attached to the inside of the slit 3a so as to be able to move up and down via guides 43a and 43b fixed to the substrate 42. The opening plate 40 is pushed upward by springs 44a and 44b below the guides 43a and 43b. A switch 45 is provided on the substrate 42 below the opening plate 40, and is arranged so that the switch 45 is turned on when the opening plate 40 is pushed down. Electromagnets 46a and 46b are also arranged on the substrate. When the switch is turned on, the electromagnet is also turned on, and the aperture plate 40 sucks the aperture plate 40 and is pushed upward by the force of the spring in the direction of the substrate. The moved state can be maintained.
A projection 41 is provided at the center of the aperture plate 40, and the aperture plate 40 can be pushed down by pressing the projection with the wiping portion 34 for wiping the blackboard. The aperture plate 40 has a structure including a material that is attracted by an electromagnet.

Next, an operation method of the second embodiment will be described. The teacher who was writing on the blackboard 1 in the classroom is talking to the students using the blackboard wipe 31 to wipe the chalk on the blackboard. Since the blackboard wipe 31 has become dirty with chalk powder, the teacher tries to clean the blackboard wipe 31. In the second embodiment, unlike the first embodiment, suction parts 2a and 2b are provided on both sides of the blackboard. Due to the presence, the teacher can quickly perform a cleaning operation with a suction unit in a nearby location. The teacher holding the blackboard wipe, for example, approaches the suction part 2a, presses the blackboard wipe wiper 34 against the protrusion 41 at the center of the opening plate 40, depresses the opening plate 40, and the switch 45 is turned on. To be. Then, the power supply of the blower 17 in the suction body 6 is turned on and suction is started. At that time, since the opening plate 40 is pushed upward by the springs 44a and 44b, the opening plate 40 tries to move in the direction of closing the slit 3a. However, the electromagnets 46a and 46b start to operate at the same time as the switch 45 is turned on. The aperture plate 40 is sucked to keep the aperture plate 40 moving in the direction of the substrate 42. Therefore, the slit 3a maintains an open state, and the inflow of air continues.

Therefore, the teacher moves the wiping portion 34 of the blackboard wiping 31 to the left and right while rubbing the edge of the slit 3a and the projection 41 of the opening plate 40 to drop the chalk powder attached to the wiping portion 34, so that the slit 3a and the opening plate 40 are removed. The chalk is removed from the blackboard wipe 31 with the air sucked in through the gap. When the blackboard wipe 31 becomes clean, the teacher returns to the original position with the blackboard wipe, and returns to the work of erasing the chalk written on the blackboard 1 with the blackboard wipe 31. During this time, classes can be continued without interruption due to noise. A magnetic force sensor (not shown) is provided on the back surface of the suction cover 8a of the suction part 2a. When the teacher finishes the blackboard wipe cleaning work and holds the blackboard wipe 31 to leave the suction part 2a, the magnetic force sensor The sensor reacts to turn off the blower 17 and simultaneously turn off the electromagnets 46a and 46b, so that the opening plate is pushed by the springs 44a and 44b to return to the position where the slit 3a is closed. In this case, the blower 17 and the electromagnets 46a and 46b are set to be turned on by the switch 45 by the push-down operation of the aperture plate 40, not the magnetic sensor, and the blower 17 and the electromagnets 46a and 46b are turned off. Is set to be performed by an electromagnetic sensor. The blower 17 and the electromagnets 46a and 46b are turned on with a magnetic sensor, and the opening plate 40 is pulled down by the electromagnet or pushed down with blackboard wiping so that the slit 3a is opened and the blackboard wiping is performed. It is also possible to set so that the blower 17 and the electromagnets 46a and 46b are turned off by the magnetic sensor reacting when the cleaning work is performed and the blackboard wipe 31 leaves the suction part 2a after the work is finished.

Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 7 is an overview of the third embodiment. The blackboard 1 is installed in a classroom, and is installed so that a suction cover 51 having a concave shape of the suction portion 2c comes to extend to the blackboard chalk receiving groove 50 at the end of the chalk receiving groove 50 at the side of the blackboard. Yes. The suction cover 51 is provided with a slit 3c so as to be perpendicular to the longitudinal direction of the concave shape. The suction part 2c is connected to the suction body 6 by a suction pipe 5c. The suction body 6 is placed on the floor of the classroom close to the wall at the corner of the classroom away from the blackboard . Even when a platform is placed in front of the blackboard 1, it is desirable that the suction body 6 be placed on the floor instead of the platform as in the first embodiment. Also, the suction body 6 may be placed on the platform or may be other than the first embodiment. It is also possible to arrange the suction part on both sides of the blackboard so as to extend into the blackboard chalk receiving groove, and there may be a plurality of slits provided in the suction cover, the direction may be any direction, and the slits It may be a combination. If the suction cover is arranged upward, it can be provided at a place other than the place where it is extended to the blackboard chalk receiving groove.

Next, an operation method of the third embodiment will be described. The teacher who was writing on the blackboard 1 in the classroom is talking to the students using the blackboard wipe 31 to wipe the chalk on the blackboard. Since the blackboard wipe 31 has become dirty with chalk powder, the teacher tries to clean the blackboard wipe 31, but in the third embodiment, unlike the first embodiment, the side of the blackboard wiper 50 has the chalk receiving groove 50. Since the suction portion 2c is provided so as to extend to the end portion, the teacher holds the blackboard wipe 31 and approaches the suction portion 2c so that the longitudinal direction of the blackboard wipe 31 is along the longitudinal direction of the concave shape of the suction cover 51. Apply. Then, a magnetic sensor (not shown) in the suction unit 2 detects magnetism by the magnetic force from the magnet 35 in the blackboard wipe 31, and the power of the blower 17 in the suction body 6 is turned on, and the air The suction is started. Then, air flows in from the slit of the suction part 2c connected by the suction pipe 5c. The teacher moves the longitudinal direction of the blackboard wipe 31 back and forth along the longitudinal direction of the suction cover 51 having a concave shape, presses the wiper 34 of the blackboard wipe 31 against the slit 3c, and removes the chalk dust adhering to the wiper 34. The wiping portion 34 is cleaned by sucking from the slit 3c. When the wiping portion is in a clean state, the blackboard wiping 31 is taken away from the suction portion 21, and the operation of returning to the original location and wiping the chalk is continued. Then, the magnetic sensor reacts to turn off the blower 17.

In the third embodiment, since the suction cover 51 of the suction portion 2c faces the upper surface, unlike the case where the suction cover 8 in the first embodiment faces in the vertical direction, the cleaning work is performed by wiping the blackboard. In addition, the chalk powder that is peeled off from the blackboard wipes down, and the floor surface is less likely to be soiled. In addition, the slit 3c also faces the upper surface, and the diffusion direction of the noise generated from the slit 3c becomes the upper surface and the ceiling direction, which has an effect of reducing the influence of noise.

A fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 is an overview of the fourth embodiment. In the figure, the blackboard 1 is installed in a classroom, and the blackboard wiping cleaning device in which the suction part 2d and the suction body 6d are connected by the upper support bar 61 and the lower support bar 62 is close to the end of the blackboard at the side of the blackboard. It is installed in the form to do. In the fourth embodiment as well, the upper support bar 61 and the lower support bar 62 slide relative to each other so that the height of the suction portion 2d is the height of the human eye within the approximate range of the height of the blackboard. After adjusting the height by sliding the, it is fixed with the stopper 63. The suction part 2d is connected to the suction body 6d by the suction pipe 5d. However, the suction pipe can be constituted by a hollow support rod, and in this case, the suction pipe 5d is not necessary. The suction body 6d is installed on the floor surface away from the blackboard. However, if there is a textbook, it may be used on the textbook. The connecting method between the suction part 2d and the suction body 6d is not limited to the rod-like shape shown here, but may be any shape such as a square shape or a plate shape.

The operation method in the case of the fourth embodiment is basically the same as that of the first embodiment, but the teacher has the blackboard wipe 31 and is provided within the approximate range of the blackboard height at the side of the blackboard. When approaching the suction part 2d and bringing the blackboard wipe 31 closer to the suction cover 8d, the magnetic sensor 4d reacts and the vacuum device starts operating, and air is sucked from the slit 3d. Therefore, the teacher moves the blackboard wipe 31 to the left and right while pressing the blackboard wipe 31 against the slit 3d to clean the chalk adhered to the blackboard wipe. The advantage of the fourth embodiment is that work such as fixing the suction part to the wall surface and piping is unnecessary, and if the blackboard wiping cleaning device is installed in the vicinity of the side part of the blackboard , it can be used immediately. It is done. Further, the height of the suction part can be easily adjusted, and the arrangement of the suction part can be easily moved to any place that is easy for the teacher to use, such as a close position on the opposite side of the blackboard.

  As described above, since the invention described in claim 1 can clean the blackboard wipe gently, it has the effect of enhancing the educational effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 3 is an overview diagram of a suction unit 2 according to the first embodiment. These are sectional drawings of the attraction | suction main body 6 in Example 1. FIG. FIG. 3 is an overview diagram of a blackboard wipe 31 in the first embodiment. These are the outline figures of Example 2. FIG. These are the cross-sectional perspective views of the switchgear in Example 2. FIG. These are the outline figures of Example 3. FIG. These are the outline figures of Example 4. FIG.

1: Blackboard
2: Suction unit
3: Slit
4: Magnetic sensor
5: Suction tube
6: Suction body
7: Suction box
8: Suction cover
10: Negative pressure device
11: Soundproof box
12: Soundproof member
13: Chalk powder reservoir
16: Dust collection filter
17: Blower
31: Blackboard wipe

Claims (4)

A suction part having a slit that can be installed close to the blackboard, a negative pressure device provided near the floor, a suction pipe connecting the suction part and the negative pressure device, and a collector installed in the negative pressure device A blackboard wiping cleaning device consisting of a dust filter and a soundproof box covering the periphery of the negative pressure device. The blackboard wiping cleaning device according to claim 1, further comprising an opening / closing mechanism in slits of the plurality of suction portions. The blackboard wiping cleaning device according to claim 1 or 2, wherein a slit of the suction portion is provided upward. 2. The blackboard wiping cleaning device according to claim 1, wherein a soundproof box covering the suction portion and the periphery of the negative pressure device is fixedly connected.

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