JP7152763B2 - Magnetic screen device - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act September 20th and 21st, 2018, exhibited at the OS exhibition (sponsored by OS Co., Ltd.) October 17th, 2018, delivery to Doshisha Junior and Senior High School 2018 Exhibited at the OS Exhibition (sponsored by OS Co., Ltd.) on November 9th Exhibited at the OS Exhibition (sponsored by OS Co., Ltd.) on December 6th and 7th, 2018

The present invention relates to a magnetic screen device used on a wall surface such as a blackboard. The present invention relates to a magnetic screen device that does not require a large force when peeling off from a blackboard or the like.

Conventionally, as a magnetic screen, there is a roll-type magnetic screen provided with winding means capable of winding and stretching a magnetic projection member, and a storage section for storing the wound projection member (patent Reference 1).

This magnetic screen is fixed to the blackboard by magnetic force when the front end of the magnetic screen is grasped by hand and pulled out from the housing, and the back of the projection surface of the projection member is brought into contact with the blackboard, and the fixed state is maintained even if the hand is released. , which allows the blackboard to be used like a normal screen.

However, in such a magnetic screen, due to a gap in the vertical direction with respect to the attachment surface between the surface to be attached and the entrance of the projection member of the housing, during the operation of attaching the projection member, there is a gap between the take-up roll and the projection member. Tension occurs in the upper end of the projection member, and even if it can be pasted, wrinkles and slack often occur in the projection member due to the effect of tension, resulting in a flat and beautiful surface. It was difficult to form the screen surface. As a solution to this problem, it was conceived to provide a strip-shaped magnet rubber on the adhesion surface above the screen surface. However, if such a magnetic rubber is used to simply strengthen the magnetic force of a portion, a large force is required when peeling off the magnetic screen, which makes the removal work troublesome and places a heavy burden on the magnetic sheet. , the sheet itself may be distorted or damaged.

Utility Model Registration No. 3093287

Therefore, what the present invention intends to solve in view of the above-mentioned situation is to provide a magnetic force stronger than the other part of the screen sheet so that the screen sheet can be pasted neatly even on a curved blackboard without wrinkles or slack. To provide a magnetic screen device that can be removed from a blackboard or the like without requiring a large force.

In order to solve the above problems, a magnetic screen device according to the present invention has a screen surface on the front side and a magnetic force on the rear side, a winding roll for winding the screen sheet, and the screen sheet. a fixing magnetic body that has a magnetic force stronger than the magnetic force of and is positioned on the winding roll side of the screen surface in the stuck state so that the screen sheet can be stuck in a stable state; Adhesion inhibiting means for forming a gap between the fixing magnetic material or the screen sheet and the surface to be adhered is provided, and the adhesion inhibiting means is a small protrusion on the adhesion surface side of the fixing magnetic material or the screen sheet. is provided .

According to this configuration, the screen sheet can be firmly attached to the winding roll side of the screen sheet by the fixing magnetic body having a strong magnetic force, and the screen sheet can be neatly attached. In addition to being easy to implement , the close contact inhibiting means can be easily constructed and manufactured at low cost. In addition, air entering between the blackboard and the screen sheet can be discharged through the gaps between the small projections during the work of pasting the screen sheet, so that a clean screen surface can be formed more easily.

Here, it is preferable that the fixing magnetic body and the adhesion inhibiting means or the bending guide means are provided over substantially the entire width of the screen sheet.

According to this configuration, the screen sheet can be pasted more neatly over substantially the entire surface of the screen sheet.

Further, the small protrusion may be formed by fixing means for attaching the fixing magnetic body to the screen sheet.

According to this configuration, the close contact inhibiting means can be easily configured, and can be manufactured at a lower cost.

Furthermore, as the fixing means, the fixing magnetic material may be sewn to the screen sheet by sewing thread, and the sewing thread may form the small projection.

According to this configuration, the fixing magnetic body can be fixed by sewing with a sewing thread, and the small protrusion can be formed. Further, the configuration can be simplified, which is advantageous in terms of manufacturing.

According to the magnet-type screen device of the present invention, a part of the screen sheet has a stronger magnetic force than the other parts, so that even a curved blackboard can be pasted neatly with the screen sheet without wrinkles or slack. In addition, it can be removed from a blackboard or the like without requiring a large force.

1 is a perspective view showing a state where a magnetic screen device according to an embodiment of the present invention is installed on a blackboard; FIG. It is a front view which similarly shows the structure of a magnet-type screen apparatus. It is a side view which similarly shows the installation state of a magnet-type screen apparatus. It is also a partial enlarged view of the magnet rubber etc. in the installation state of the magnetic screen device, (a) showing the sticking posture of the magnet rubber, and (b) showing the bending posture of the magnet rubber. FIG. 4 is a partially enlarged view of magnet rubbers and the like showing the configuration of a magnetic screen device according to another embodiment of the present invention, in which (a) shows the sticking posture of the magnet rubber, and (b) shows the bending posture of the magnet rubber. is. FIG. 10 is a partially enlarged view of a magnet rubber, etc., showing the configuration of a magnetic screen device according to still another embodiment of the present invention, in which (a) is a magnet rubber interposed between a screen sheet and an upper black portion; , (b) are those in which small projections are integrally provided on the attachment surface of the magnet rubber.

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings, but the present invention is not limited to the forms shown in the accompanying drawings and includes all embodiments that satisfy the requirements described in the claims. .

In this specification, the screen surface side is defined as the front surface of the magnetic screen device, and the opposite surface, the attached surface side, is defined as the rear surface of the magnetic screen device. In addition, the winding roll side of the screen surface means a portion near the winding roll regardless of whether it is inside or outside the area of the screen surface. part, a part closer to the winding roll than the screen surface, and all of these neighboring areas, regardless of the front side or the back side. Furthermore, the bending posture refers to a posture in which a predetermined portion is bent and separated from the target surface, so that the magnetic force acting on the target surface is smaller than that in the sticking posture. Guidance for posture change to posture, and this guidance refers to guidance for bending at a predetermined position. In addition, the term "magnetic material" broadly refers to an object that is tinged with magnetism.

As shown in FIGS. 1 to 3, the magnetic screen device 1 according to the present embodiment can be attached to the upper frame Ba of the blackboard B so that part of the blackboard B can be used as a screen for projection. A screen sheet 2 having a screen surface 3 on the front side and magnetic force on the rear side, a winding roll 5 for winding the screen sheet 2, and the winding roll 5 rotatably supported and accommodated. A housing 7 is provided, and an upper black portion 4 is provided between the screen sheet 2 and the winding roll 5 . A band-shaped magnet rubber 9 is provided over the entire width of the screen sheet 2 as a fixing magnetic material on the attachment surface side of the upper side of the screen sheet 2 .

Here, the magnetic screen device 1 is used as a screen for projection, but is not limited to this, and can be used as an electronic blackboard or a whiteboard, for example. The shape of the surface to be adhered is not limited to the curved (concave) surface shown in FIG. 1, and may be a flat surface, a convex surface, or other shape.

The screen sheet 2 has a screen surface 3 on the front side and a magnetic force that enables the screen sheet 2 to be attached to a blackboard or the like on the rear side. An upper black portion 4 which is not used as a screen is connected to the upper side of the screen sheet 2 , and a magnet rubber 9 is provided at the connecting portion between the upper black portion 4 and the screen sheet 2 .

The screen surface 3 is formed on the front side of the screen sheet 2 . An image projected from the projector is displayed on the screen surface 3, and the user can view the image. The screen surface 3 is not limited to being provided on the entire front side of the screen sheet 2 as shown in the figure, but may be provided on a part of the screen sheet 2 or on both sides. All other modes, such as those configured using separate bodies, can be adopted.

The upper black portion 4 is sewn and fixed to the upper side of the screen sheet 2 in such a manner that the ends of both members overlap each other. The sewn parts are superimposed so that the front side is the upper black part 4 and the rear side is the screen sheet 2, and even if the screen sheet 2 above the sewing thread 6 were to sag, this would be the user's side. Since it does not appear on the front side and does not interfere with the screen surface 3, it has a preferable specification as a screen, but it may be configured so that the front side is the screen sheet 2 and the rear side is the upper black portion 4. The upper black portion 4 has elasticity to eliminate the gap between the surface to be pasted and the entrance of the screen sheet 2 of the housing 7, but such a configuration is not essential. Other configurations may eliminate the gap.

The winding roll 5 has a cylindrical shape and is housed in a housing 7. A spring member is attached to the winding roll 5 to bias the screen sheet 2 in the winding direction. By this spring member, the screen sheet 2 receives force in the winding direction from the take-up roll 5 at all times or when necessary, and the rotation of the screen sheet 2 is regulated at least by the weight of the screen sheet 2 so that the screen sheet 2 is not let out. It should be noted that the rotation restriction by such a configuration is common in roll-type screen devices. Then, tension is generated between the winding roll 5 whose rotation is restricted, and it becomes difficult to adhere the upper end of the screen sheet 2 neatly only by the magnetic force of the screen sheet 2 . For this reason, in the magnetic screen device 1 , a strip-shaped magnet rubber 9 is provided at the upper end of the screen sheet 2 as a fixing magnetic material. The magnet rubber 9 is sewn and fixed to the screen sheet 2 with a sewing thread 6. - 特許庁In addition, providing an automatic or semi-automatic rotating means for the screen sheet 2 enhances convenience, and as a specific configuration, for example, an electric driving device can be employed.

A sewing thread 6 sews the upper black portion 4, the screen sheet 2 and the magnet rubber 9 together to fix them integrally. The sewing thread 6 is machine-stitched to these to form perforations on the foremost and rearmost surfaces. , and acts as a close contact inhibiting means. Here, since the upper black portion 4, the screen sheet 2 and the magnet rubber 9 are sewn together and adhered to each other with an adhesive, they are integrated even at portions other than the sewn portions. This adhesion is also used for temporary fixation before suturing, making it possible to easily manufacture, but such adhesion is not essential, and according to the integration by stitching only , the degree of freedom of each constituent member is increased, making it more suitable as a roll-type magnetic screen that is wound around the take-up roll 5 .

Two sewing threads 6 are provided in parallel at substantially the center in the width direction of the strip-shaped magnet rubber 9 . The two sewing threads 6, 6 divide the magnet rubber 9 into upper and lower parts in the width direction. It is divided into and magnetically attached. In addition, the intermediate portion 9c between the upper portion 9a and the lower portion 9b is separated from the attached portion by the two sewing threads 6, 6, but has a smaller magnetic force than the upper portion 9a and the lower portion 9b. It acts on the surface to be adhered.

When removing the magnet rubber 9, the screen sheet 2 is pulled forward, so that the lower portion 9b of the magnet rubber 9 is first removed, followed by the intermediate portion 9c, and finally the upper portion 9a, as shown in FIG. 4(b). It is not necessary to peel off all at once, and a large force is not required. In this way, the sewing thread 6 is also effective as bending guide means. The sewing thread 6 is made of a non-magnetic thread material to further reduce the magnetic attraction force of the intermediate portion 9c. In addition, regarding the number of sewing threads 6 and the sewing method, in the magnetic screen device 1, two threads are sewn in parallel to obtain an efficient and stable magnetized state. It may be three or more, and may be sewn in a non-parallel state.

The magnet rubber 9 is a strip-shaped magnetic rubber body having a magnetic force stronger than that of the screen sheet 2 . Since the magnet rubber 9 provided at the end of the screen sheet 2 has a magnetic force stronger than that of the screen sheet 2, even if the upper end of the attached screen sheet 2 is pulled obliquely upward and forward by the upper black portion 4, A clean screen surface 3 can be formed and maintained without being peeled off from the blackboard B and wrinkled. In addition, since the magnet rubber 9 has flexibility, it can adhere to a curved blackboard without any problem and can be strongly magnetically attached. As described above, the magnet rubber 9 has a strong magnetic force in order to prevent the screen sheet 2, particularly the end portion, from being peeled off from the blackboard B. By providing the adhesion inhibiting means, it can be easily removed from the blackboard B without requiring a large force. It should be noted that the same effect can be obtained even if posture changing means is provided in place of the close contact inhibiting means.

The close contact inhibiting means in the magnetic screen device 1 is composed of a plurality of small projection-like sewing threads 6 provided on the attachment surface side of the magnet rubber 9 . Since a plurality of small projections are provided on the attachment surface of the magnet rubber 9, when the magnet rubber 9 is peeled off in the attached state, these small projections serve as fulcrums and force acts. The work can be done easily. In other words, the magnetic screen device 1 is equipped with the close contact inhibiting means and the magnet rubber 9 has flexibility, so that the detachment work can be easily performed without requiring a large force. Further, as the close contact inhibiting means, it is not limited to a plurality of stitch-like small projections as shown in the figure, but other structures can be adopted. 9 is formed in the longitudinal direction so as to vertically ventilate the space between the magnet rubber 9 and the blackboard B. The interposed air can be discharged upward (in the direction toward the winding roll 5), and the operation of attaching the screen sheet 2 can be made simpler.

In addition, since the sewing thread 6 is provided in a straight line, the fixing magnetic body functions as bending guide means for changing from the pasting posture to a bending posture in which the magnetic force acting on the sticking target surface is reduced during the removal work. It is supposed to It should be noted that the bending guide means may be configured by providing grooves or steps other than the small protrusions.

The casing 7 has an elongated rectangular parallelepiped shape, and a slit having a width and a thickness larger than those of the screen sheet 2 is provided on the surface on which the screen sheet 2 is drawn out. is rolled out. Also, this slit is formed with a width smaller than that of the lower end bar 8 provided on the leading end side of the screen sheet 2 . Therefore, when the screen sheet 2 is completely wound, the lower end bar 8 cannot pass through the slit and comes into contact with the housing 7, thereby completing the winding.

FIG. 5 shows another embodiment of the fixing magnetic body of the magnet type screen device according to the present invention.

As shown in FIG. 5(a), the fixing magnetic body 9A is a rigid magnetic body having a plurality of grooves 10, 10 extending in the longitudinal direction on the adhering surface. The inside is sutured with suture thread 6. Therefore, the sewing thread 6 does not come into contact with the blackboard B, which is the surface to be affixed, and a more stable affixing state can be obtained. In this configuration, the sewing thread 6 does not function as the adhesion inhibiting means, but the grooved line 10 functions as the bending guide means.

When removing the fixing magnetic body 9A, the screen sheet 2 is pulled forward to be peeled off from the blackboard B, and then the screen sheet 2 is pulled so that the fixing magnetic body 9A is first removed as shown in FIG. 5(b). By bending, the lower part is separated from the blackboard B, and the intermediate part and the upper part are magnetically attached to the blackboard B. At this time, the fixing magnetic body 9A is bent so that the lower portion is spaced apart, and is in the first bending posture. Next, by further pulling the screen sheet 2, the intermediate portion of the fixing magnetic body 9A is also separated from the blackboard B, and the fixing magnetic body 9A assumes the second bending posture. Finally, by separating the remaining upper part from the blackboard B, the fixing magnetic body 9A can be peeled off from the blackboard. Thus, in the fixing magnetic body 9A, the two grooves 10, 10 function as bending guide means, so that the separation from the blackboard B is performed in stages, and the force required for the removal work is performed. is small.

FIG. 6 shows still another embodiment of the fixing magnetic body of the magnet type screen device according to the present invention.

As shown in FIG. 6(a), the fixing magnetic body 9B is a rigid magnetic body interposed between the screen sheet 2 and the upper black portion 4. , is provided on the adhesion surface of the screen sheet 2 . According to such a configuration, when removing the screen sheet 2, by pulling the screen sheet 2 forward, the fixing magnetic bodies 9A can be peeled off sequentially from the lower side, and the removal of the screen sheet 2 can be made smoother. can be done. In other words, the sewing thread 6 functions as a means for preventing close contact and a means for changing posture.

As shown in FIG. 6(b), the fixing magnetic body 9C is a rigid magnetic body having a plurality of small protrusions 11 provided on the attachment surface. Since the small projections 11 are formed integrally with the fixing magnetic body 9C, they naturally have magnetism. can be easily removed. In other words, the small projection 11 functions as a close contact inhibiting means and an attitude changing means. Further, in this fixing magnetic body 9C, the screen sheet 2, the upper black portion 4 and the fixing magnetic body 9C are fixed only with an adhesive, and are not stitched with sewing thread.

In any embodiment, other configurations are the same as those of the magnetic screen device 1, and descriptions thereof are omitted.

In the above description, the screen sheet has adhesive strength over the entire sheet, but the screen sheet is not limited to such a sheet, and may have magnetic force, adhesive strength, etc. partially. Therefore, it may be configured to be easily removable. In addition, it is not limited to the one in which the housing is arranged on the upper side of the screen sheet. The sheet may be stretched in the horizontal direction. Furthermore, the mounting portion does not have to be fixed to an existing facility such as a blackboard. For example, a rail member extending in the left-right direction is fixed to the mounting target, and the mounting portion is slidably engaged with the rail. As a result, the magnetic screen device can be moved within the range of the rail member, and the installation location can be set more freely.

1 Magnet type screen device 2 Screen sheet 3 Screen surface 4 Upper black part 5 Winding roll 6 Sewing thread 7 Housing 8 Lower end bar 9 Magnet rubber 9a Upper part 9b Lower part 9c Intermediate part 9A Magnetic body for fixing (interposed type)
9B Fixing magnetic material (notch type)
9C Fixing magnetic body (small protrusion integrated type)
10 concave streak 11 small projection (integrated type)
Ｂ Blackboard BA Upper rail frame

Claims (4)

a screen sheet having a screen surface on the front side and a magnetic force on the rear side;
a winding roll for winding the screen sheet;
a fixing magnetic body that has a magnetic force stronger than that of the screen sheet and is positioned on the winding roll side of the screen surface in the stuck state, so that the screen sheet can be stuck in a stable state;
a close contact inhibiting means for forming a gap between the fixing magnetic material or the screen sheet and the surface to be attached in the attached state ;
As the close contact inhibiting means, a small film is attached to the fixing magnetic material or the screen sheet on the sticking surface side.
1. A magnetic screen device characterized by being provided with projections . 2. A magnetic screen device according to claim 1, wherein said fixing magnetic body and said adhesion inhibiting means are provided over substantially the entire width of said screen sheet. 3. A magnetic screen device according to claim 1 , wherein said small projection is formed by fixing means for attaching said fixing magnetic body to said screen sheet. 4. A magnetic screen device according to claim 3 , wherein said fixing means is such that said fixing magnetic material is sewn onto said screen sheet by sewing, and said sewing thread forms said small protrusions.

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