JP2020098256A - Magnet type screen device - Google Patents

Abstract

To provide a magnet type screen device that includes stronger magnetic force than other part in one part to thereby enable a screen sheet to be neatly stuck even to a curved black board with no wrinkle or loose, and further does not need great force upon removing the screen sheet from the black board and the like.SOLUTION: A magnet type screen device 1 comprises: a screen sheet 2 that has a screen face 3 on a front face side, and has magnetic force on a rear face side; a winding roll 5; a magnet rubber 9 that has stronger magnetic force than that of the screen sheet 2, is located on a winding roll 5 side of the screen face 3 in a stuck state, and thereby enables the screen sheet 2 to be stuck in a stable state; and close-stick blockage means (a sewing thread 6) that forms a gap between a stick object face and the sewing thread in the stuck state, or bend guide means that enables an anchoring-purpose magnetized body to be changed from a stick posture to a bend posture in which magnetic force acting on an object face becomes small.SELECTED DRAWING: Figure 1

Description

The present invention relates to a magnet type screen device used for a wall surface of a blackboard or the like, and more specifically, even a curved blackboard or the like can cleanly attach the screen sheet without causing wrinkles or slack, and the screen sheet The present invention relates to a magnet type screen device that does not require a large force when peeled from a blackboard or the like.

2. Description of the Related Art Conventionally, as a magnet type screen, there is a roll type magnet type screen having a 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 magnet type screen is fixed to the blackboard by magnetic force when the tip of the projection is grasped by hand and pulled out from the storage part, and the back surface of the projection surface of the projection member is aligned with the blackboard, and the fixed state is maintained even if the hand is released. Thus, the blackboard can be used like a normal screen.

However, in such a magnet type screen, the gap between the take-up roll and the projection member during the sticking operation of the projection member due to the gap between the sticking target surface and the entrance of the projection member of the housing in the direction perpendicular to the sticking surface. Tension is generated on the projection member, and the upper end of the projection member cannot be attached neatly, and even if it is attached, the projection member often wrinkles or sags due to the influence of the tension, and it is flat and neat. It was difficult to form the screen surface. As a solution to such a problem, it has been considered to provide a belt-shaped magnet rubber on the pasting surface above the screen surface. However, if a part of the magnetic force is simply increased by using such a magnet rubber, a large force is required when peeling off the magnet type screen, which makes the removal work troublesome and a great burden on the magnet sheet. However, the sheet itself would 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 that a screen sheet can be attached neatly without wrinkles or slack even on a curved blackboard by providing a part of the screen sheet with a stronger magnetic force than other parts. In addition, it is possible to provide a magnet type screen device which does not require a large force when detached from a blackboard or the like.

In order to solve the above problems, a magnet type screen device according to the present invention has a screen sheet having a screen surface on the front side and magnetic force on the rear side, a winding roll for winding the screen sheet, and the screen sheet. The magnetic material for fixation that has a stronger magnetic force than the magnetic force of, and is located on the side of the winding roll of the screen surface in the pasted state, and can be pasted in a stable state of the screen sheet, and in the pasted state. Adhesion inhibiting means that forms a gap between the fixing magnetic body or the screen sheet and the sticking target surface, or the fixing magnetic body has a smaller magnetic force acting on the sticking target surface from the sticking posture than in the sticking posture. And a bending guide means capable of changing the posture to another bending posture.

According to this structure, the wind-up roll side of the screen sheet can be firmly attached with the fixing magnetic body having a strong magnetic force, and the screen sheet can be attached neatly, and the adhesion inhibiting means or the attitude changing means Can be easily removed.

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.

With this configuration, the screen sheet can be attached more neatly over substantially the entire area of the screen sheet.

Further, it is more preferable that a small protrusion is provided on the attaching surface side of the fixing magnetic body or the screen sheet as the adhesion inhibiting means.

According to this configuration, the adhesion inhibiting means can be easily configured and can be manufactured at low cost. In addition, in the operation of attaching the screen sheet, the air entering between the blackboard and the screen sheet can be removed from the gap between the small protrusions, and a clean screen surface can be formed more easily.

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

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

Furthermore, the fixing means may be one in which the fixing magnetic body is sewn and fixed to the screen sheet with a thread, and the thread forms the small protrusion.

According to this structure, the fixing magnetic body can be fixed by sewing with a sewing thread, and the small protrusion can be formed, and a simpler structure can be obtained, which is also advantageous in manufacturing.

Further, as the bending guide means, a concave strip or a step portion extending in the longitudinal direction may be provided on the attaching surface side of the fixing magnetic body.

According to this structure, the bending guide unit can be obtained with a simple structure.

According to the magnet type screen device of the present invention, a part of the screen sheet is provided with a stronger magnetic force than other parts, so that the screen sheet can be attached neatly without wrinkles or slack even on a curved blackboard. Moreover, it can be removed from the blackboard without requiring a great deal of force.

It is a perspective view showing the state where the magnet type screen device concerning the embodiment of the present invention was installed in the blackboard. It is a front view which similarly shows the structure of a magnet type screen device. It is a side view which similarly shows the installation state of a magnet type screen device. Similarly, it is a partially enlarged view of the magnet rubber and the like in the installed state of the magnet type screen device, (a) shows the sticking posture of the magnet rubber, (b) shows the bending posture of the magnet rubber. It is a partial enlarged view of a magnet rubber etc. which shows the structure of the magnet type screen device which concerns on other embodiment of this invention, (a) shows a sticking posture of a magnet rubber, (b) shows a bending posture of a magnet rubber. Is. FIG. 6 is a partially enlarged view of a magnet rubber or the like showing a configuration of a magnet type 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 a small protrusion is integrally provided on the surface where the magnet rubber is attached.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to the form shown in the accompanying drawings and includes all embodiments satisfying the requirements described in the claims. ..

In this specification, the screen surface side is the front surface of the magnet type screen device, and the sticking surface side opposite to this is the rear surface of the magnet type screen device. Further, the take-up roll side of the screen surface means a portion close to the take-up roll, regardless of whether it is inside or outside the area of the screen surface, and specifically, the end of the screen surface close to the take-up roll. Part, a part closer to the winding roll than the screen surface, and all of these neighboring areas, regardless of the front surface side or the back surface side. Further, the bending posture is a posture in which a magnetic force acting on the sticking target surface becomes smaller than that in the sticking posture by bending a predetermined portion and separating from the sticking target surface. The guidance refers to a posture change to a posture, and this guide refers to bending at a predetermined position. In addition, a magnetic material is a broad term for an object having magnetism.

As shown in FIGS. 1 to 3, the magnet type screen device 1 according to the present embodiment can be used as a screen for projection of a part of the blackboard B by attaching it to the upper frame Ba of the blackboard B. Which has a screen surface 3 on the front side and has a 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. The housing 7 is provided, and the upper black portion 4 is provided between the screen sheet 2 and the winding roll 5. In addition, a band-shaped magnet rubber 9 is provided as a fixing magnetic body over the entire width of the screen sheet 2 on the sticking surface side of the upper side of the screen sheet 2.

Here, the magnet type screen device 1 is used as a screen for projection, but is not limited to this and can be used as, for example, an electronic blackboard or a whiteboard. Further, the shape of the sticking target surface is not limited to the curved (concave curved) surface as shown in FIG. 1, but may be another shape such as a flat surface or a convex curved surface.

The screen sheet 2 has a front surface as a screen surface 3 and a rear surface having a magnetic force that allows the screen sheet 2 to be attached to a blackboard or the like. 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 a connecting portion between the upper black portion 4 and the screen sheet 2.

The screen surface 3 is configured on the front surface side of the screen sheet 2. The image projected from the projector is displayed on the screen surface 3 so that the user can view the image. The screen surface 3 is not limited to being provided on the entire area on the front surface side of the screen sheet 2 as shown in the drawing, but may be provided on a part or both sides of the screen sheet 2, or It is possible to employ all other aspects such as those configured by using separate bodies.

The upper black portion 4 is sewn and fixed to the upper side of the screen sheet 2 with the ends of both members overlapping each other. The sewn portion is superposed so that the front side is the upper black portion 4 and the rear side is the screen sheet 2, and even if the screen sheet 2 above the sewing thread 6 hangs down, this is the user side. Since it does not appear on the front surface side and does not interfere with the screen surface 3, it has a preferable specification as a screen, but the front side may be the screen sheet 2 and the rear side may be the upper black portion 4. The upper black portion 4 has elasticity so as to eliminate the gap between the sticking target surface and the entrance of the screen sheet 2 of the housing 7, but such a configuration is not essential. The gap may be eliminated by other configurations.

The take-up roll 5 has a cylindrical shape and is housed in a housing 7. The take-up roll 5 is attached with a spring member that urges the screen sheet 2 to rotate in a winding direction. By this spring member, the screen sheet 2 is subjected to a force in a winding direction from the winding roll 5 at all times or when necessary, and the rotation of the screen sheet 2 is regulated so that the screen sheet 2 is not drawn out at least by its own weight. The rotation regulation by such a configuration is common in the roll-type screen device, but due to this rotation regulation, in the attaching work of the screen sheet 2, the lower portion of the screen sheet 2 previously attached to the blackboard B is attached. Then, tension is generated between the winding roll 5 whose rotation is restricted, and it becomes difficult to cleanly attach the upper end of the screen sheet 2 only by the magnetic force of the screen sheet 2. For this reason, in the magnet type screen device 1, a band-shaped magnet rubber 9 is provided as a fixing magnetic body at the upper end of the screen sheet 2. The magnet rubber 9 is sewn and fixed to the screen sheet 2 with a sewing thread 6. Further, the automatic or semi-automatic rotation means for the screen sheet 2 is provided, which is highly convenient, but as a specific configuration, for example, an electric drive device can be adopted.

The sewing thread 6 sews the upper black portion 4, the screen sheet 2, and the magnet rubber 9, and fixes them integrally. The sewing thread 6 is sewn on these to form perforations on the forefront surface and the rearmost surface, and the sewing threads 6 formed on the perforations are arranged in a plurality of rows in the area of the magnet rubber 9. The small protrusions are used to act as an adhesion inhibiting means. Here, the upper black portion 4, the screen sheet 2, and the magnet rubber 9 are sewn together and are adhered to each other with an adhesive, so that they are integrated even at portions other than the sewn portion. This adhesion is also used for temporary fixing before suturing, and the manufacturing can be easily performed. However, such adhering is not indispensable. The degree of freedom of each constituent member can be made high, and it can be made more suitable as a roll-type magnetic screen for winding the winding roll 5.

Further, the two sewing threads 6 are provided in parallel with each other at approximately the center in the width direction of the belt-shaped magnet rubber 9. The magnet rubber 9 is divided into upper and lower parts in the width direction by the two sewing threads 6 and 6, and in the pasted state, as shown in FIG. 4(a), the magnet rubber 9 is divided into an upper part 9a and a lower part 9b. It is divided into two parts and magnetically attached. Further, the intermediate portion 9c between the upper portion 9a and the lower portion 9b is separated from the pasted portion by the two sewing threads 6 and 6, but has a smaller magnetic force than the upper portion 9a and the lower portion 9b. It acts on the surface to be attached.

When removing the magnet rubber 9, by pulling the screen sheet 2 to the front side, as shown in FIG. 4B, first, the lower portion 9b of the magnet rubber 9 comes off, then the intermediate portion 9c, and finally the upper portion 9a. By removing it, it will be removed in stages, it is not necessary to peel everything off at once, and it does not require a large force. In this way, the sewing thread 6 also has an effect as bending guide means. The sewing thread 6 is made of a thread material having no magnetism so that the magnetic force of the intermediate portion 9c can be made smaller. However, the sewing thread 6 is not limited to such a material and may have magnetism. Regarding the number of sewing threads 6 and the sewing method, the magnet type screen device 1 is supposed to obtain a stable magnetically attached state by sewing two parallel threads. It may be three or more and may be sewn in a non-parallel state.

The magnet rubber 9 is a strip-like magnetized rubber body and has a stronger magnetic force than the screen sheet 2. Since the magnet rubber 9 provided at the end portion of the screen sheet 2 has a stronger magnetic force than the screen sheet 2, even if the upper end portion of the screen sheet 2 in the pasted state is pulled diagonally upward and forward by the upper black portion 4, It is possible to form and maintain a clean screen surface 3 without peeling off from the blackboard B and without causing wrinkles. Further, since this magnet rubber 9 has flexibility, it can be adhered to a curved blackboard without any problem and strongly magnetized. As described above, the magnet rubber 9 has a strong magnetic force in order to prevent the end portion of the screen sheet 2 from being peeled off from the blackboard B, but the magnet rubber 9 will be described later. By providing the adhesion inhibiting means, it is possible to easily remove from the blackboard B without requiring a large force. Even if the posture changing means is provided instead of the adhesion inhibiting means, the same effect can be obtained.

The adhesion inhibiting means in the magnet type screen device 1 is composed of a plurality of small protruding sewing threads 6 provided on the attaching surface side of the magnet rubber 9. Since a plurality of small protrusions are provided on the sticking surface side of the magnet rubber 9, when the magnet rubber 9 in the stuck state is peeled off, these small protrusions serve as a fulcrum to exert a force. The work can be done easily. That is, since the magnet rubber 9 is provided with the adhesion inhibiting means and has flexibility, the magnet type screen device 1 can be easily detached without requiring a large force. Further, the adhesion inhibiting means is not limited to a plurality of stitch-shaped small projections as shown in the figure, but other configurations can be adopted. According to the structure in which a gap is formed in the longitudinal direction of 9 to vertically ventilate between the magnetic rubber 9 and the blackboard B, the screen sheet 2 and the blackboard B are separated from each other in the attaching operation of the screen sheet 2. The air that has entered the space 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.

Further, since the fixing magnetic body is provided with the sewing thread 6 in a linear shape, it functions as a bending guide means for changing the sticking posture from the sticking posture to a bending posture in which the magnetic force acting on the sticking target surface is reduced during the detaching work. It is supposed to do. Note that the bending guide means may be configured by being provided with a groove or a step other than the small protrusion.

The casing 7 has an elongated rectangular shape, and a slit having a width and a thickness larger than the screen sheet 2 is provided on the surface on the side where the screen sheet 2 is drawn out. Is paid out. The slit is formed with a width smaller than the lower end bar 8 provided on the front end side of the screen sheet 2. Therefore, when the screen sheet 2 is completely wound during the winding of the screen sheet 2, the lower end bar 8 cannot pass through the slit and comes into contact with the housing 7 to complete 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 9 A is a magnetic body having rigidity, in which a plurality of recessed strips 10, 10 extending in the longitudinal direction are provided on the sticking surface. The inside is sewn with a sewing thread 6. Therefore, the sewing thread 6 does not come into contact with the blackboard B, which is the surface to be stuck, and a more stable stuck state can be obtained. In this configuration, the sewing thread 6 does not function as the adhesion inhibiting means, but the concave line 10 functions as the bending guide means.

When removing the fixing magnetic body 9A, the screen sheet 2 is pulled to the front and 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). When bent, the lower part is separated from the blackboard B, and the middle 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 thereof is separated, and is in the first bending posture. Next, by pulling the screen sheet 2 further, the intermediate portion of the fixing magnetic body 9A is also separated from the blackboard B, and the fixing magnetic body 9A is in the second bending posture. Finally, by separating the remaining upper part from the blackboard B as well, the fixing magnetic body 9A can be peeled off from the blackboard. As described above, in the fixing magnetic body 9A, the two recessed strips 10 and 10 function as the bending guide means, so that the space from the blackboard B is gradually increased, and the force required for the removal work is increased. 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. 6A, the fixing magnetic body 9B is a rigid magnetic body interposed between the screen sheet 2 and the upper black portion 4, and in this configuration, the small protrusion by the sewing thread 6 is , Which is provided on the sticking surface of the screen sheet 2. According to this structure, when the screen sheet 2 is removed, the fixing magnetic body 9A can be peeled off from the bottom side by pulling the screen sheet 2 toward the front side, so that the screen sheet 2 can be removed more smoothly. Can be done. That is, the sewing thread 6 functions as a contact obstructing means and a posture changing means.

As shown in FIG. 6B, 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 protrusions 11 are formed integrally with the fixing magnetic body 9C, they naturally have magnetism, but even with such a configuration, the small protrusions 11 serve as fulcrums to serve as the screen sheet 2. Can be easily removed. That is, the small protrusions 11 function as a contact obstructing unit and a posture changing unit. In addition, 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 the stitching with a sewing thread is not performed.

In any of the embodiments, the other configurations are similar to those of the magnet type screen device 1, and the description thereof will be omitted.

In the above description, the screen sheet is shown to have adhesive force over the entire sheet, but the screen sheet is not limited to such a thing, and it is assumed that the screen sheet partially has magnetic force or adhesive force. Therefore, it may be configured to be easily removable. In addition, it is not limited to the case where the housing is arranged above the screen sheet, but the case where the housing is arranged below and the screen sheet is expanded upward, or the case where the housing is arranged on either left or right The sheet may be stretched in the left-right direction. Further, the mounting portion does not have to be fixed to the existing equipment 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 this rail. With this configuration, the magnet type screen device can be moved within the range of the rail member, and the installation place 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 Fixing Magnetic Material (Intermediate Type)
9B Magnetic material for fixing (notch type)
9C Fixing magnetic body (small protrusion integrated type)
10 Groove 11 Small protrusion (integrated type)
B Blackboard Ba Upper frame

Claims (6)

While having a screen surface on the front side, a screen sheet having a magnetic force on the rear side,
A winding roll for winding the screen sheet,
Having a magnetic force stronger than the magnetic force of the screen sheet, by being located on the winding roll side of the screen surface in the attached state, a fixing magnetic body that can be attached in a stable state of the screen sheet,
Adhesion inhibiting means for forming a gap between the fixing magnetic body or the screen sheet and the sticking target surface in the stuck state, or the fixing magnetic body acts on the sticking target surface from the sticking posture rather than the sticking posture A magnet type screen device, comprising: a bending guide means capable of changing its posture to a bending posture in which a magnetic force is reduced. The magnet type screen device according to claim 1, wherein 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. The magnet type screen device according to claim 1 or 2, wherein a small protrusion is provided on the attachment surface side of the fixing magnetic body or the screen sheet as the adhesion inhibiting means. 4. The magnet type screen device according to claim 3, wherein the small protrusion is formed by a fixing means for attaching the fixing magnetic body to the screen sheet. 5. The magnet type screen device according to claim 4, wherein, as the fixing means, the fixing magnetic body is sewn and fixed to the screen sheet with a thread, and the thread forms the small protrusion. The magnet type screen device according to claim 1 or 2, wherein as the bending guide means, a concave strip or a step portion extending in the longitudinal direction is provided on the attaching surface side of the fixing magnetic body.

Images