Display sheet holding unit and display apparatus provided with the same

Abstract

To make it easy and simple to attach and detach an advertising display member in a display apparatus such as an internally illuminated signboard.SOLUTION: A display sheet holding unit of the present invention is a unit for holding a display sheet 13 in a stretched state. The display sheet holding unit includes a frame 12 formed in a rectangular frame structure and a pressing member 14 attached to the frame 12. The frame 12 includes a receiving member 11 formed such that the opening direction of a recess 20 faces outward of the frame structure of the frame 12. The pressing member 14 has a protrusion 31 that fits into the recess 20 of the receiving member 11. When the pressing member 14 is attached to the frame 12, the recess 20 of the receiving member 11 receives an edge 44 of the display sheet 13, and the edge 44 of the display sheet 13 is clamped and fixed between the protrusion 31 of the pressing member 14 and the recess 20 of the receiving member 11. The display sheet holding unit is portable.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a display sheet holding unit and a display device to which the holding unit is attached. [Background technology]

[0002] Externally illuminated signs and internally illuminated signs are known as display devices that are supported on the walls of buildings and display advertisements. Externally illuminated signs are signs that illuminate the advertising display material of the sign body with light sources such as spotlights or LEDs installed on the outside of the advertising display material, while internally illuminated signs are signs that illuminate the sign body from the inside with lighting sources such as LEDs or fluorescent lights installed inside the advertising display material of the sign body. Unlike externally illuminated signs that illuminate the advertising display material from the outside, internally illuminated signs can illuminate the entire sign evenly by illuminating it from the inside, which makes them more visible, especially at night.

[0003] Acrylic panels and flexible face (FF) sheets are commonly used as materials for advertising display components of internally illuminated signs. Of these, acrylic panels have the advantages of being lightweight, durable, and easy to replace.

[0004] However, acrylic panels have the drawback of being highly flammable. For this reason, especially in the case of outdoor signs, if the sign is installed in a fire prevention area, it may be necessary to change the advertising display member made of a resin plate such as an acrylic panel to an internally illuminated sign that uses a non-flammable sheet for the advertising display member.

[0005] In internally illuminated signs that use FF sheets as advertising display materials, the FF sheets can be made of flame-retardant or non-flammable materials. When using FF sheets, the FF sheets, on which the advertising content is printed or on which a marking film displaying the advertising content is attached, must be attached in a stretched state to the frame-like structure that constitutes the internally illuminated sign. For this reason, the structure must be made of, for example, a steel frame or angle bar. To secure the FF sheet in a tensed, or stretched, state to this structure, two types of tensioning fittings are required: a sheet tensioning support member (tensioning frame) and a sheet tensioning retainer (tensioning bar) that clamps the FF sheet between the support member (see, for example, Patent Document 1 and Patent Document 2). In addition, when attaching an FF sheet to a frame-like structure for an internally illuminated sign, it is necessary to fix a sheet extension support material to this structure with mounting screws, sandwich the edge of the FF sheet between the sheet extension support material and the sheet extension presser material to extend the FF sheet in a tensile state, and then fix it with multiple mounting screws to maintain that state. Furthermore, to improve the design, it is necessary to cover the edge of the FF sheet, including the sheet extension support material and the sheet extension presser material, with a frame cover.

[0006] Therefore, for example, when replacing the advertising display member of an existing internally illuminated signboard with a new one, a fairly complicated process is required. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Design Registration No. 1380290 [Patent Document 2] Design Registration No. 1380291 Summary of the Invention [Problem to be solved by the invention]

[0008] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a display device such as an internally illuminated signboard that allows the attachment and detachment of an advertising display member to be carried out simply and easily. [Means for solving the problem]

[0009] To achieve this object, the present invention provides a display sheet holding unit for holding a display sheet in a stretched state, The display sheet holding unit has a frame formed in a rectangular frame structure and a pressing member attached to the frame, The frame has a receiving member formed so that an opening direction of the recessed portion faces outward from the frame of the frame structure, and the pressing member has a protrusion that fits into the recessed portion of the receiving member, When the pressing member is attached to the frame, the recessed portion of the receiving member receives the edge of the display sheet, and the edge of the display sheet is sandwiched and fixed between the protruding portion of the pressing member and the recessed portion of the receiving member, The display sheet holding unit is characterized by being portable.

[0010] With such a display sheet holding unit, the unit is configured in such a way that the display sheet is held in a stretched state on the frame, so that by simply attaching this unit to the frame-shaped structure that constitutes the internally illuminated sign, a display sheet for advertising display can be attached to the internally illuminated sign without having to perform the work of stretching the display sheet on the structure.

[0011] According to the display sheet holding unit of the present invention, the pressing member has a raised portion formed in a direction intersecting the protruding direction of the convex portion and formed integrally with the convex portion, and an attachment portion is formed integrally and contiguous with the raised portion, and it is preferable that the attachment portion be attachable to a display device to which the display sheet holding unit is attached.

[0012] With such a display sheet holding unit, the display sheet holding unit can be attached to the display device by the attachment portion.

[0013] According to the display sheet holding unit of the present invention, the frame of the frame structure can have connecting members for fixing and joining adjacent receiving members to each other at the corners of the frame structure.

[0014] With such a display sheet holding unit, the frame can be reliably formed into a frame structure by the connecting members.

[0015] According to the display sheet holding unit of the present invention, it is preferable that a reinforcing member is removably attached to prevent the frame from being deformed by the force applied by the display sheet in a stretched state.

[0016] With such a display sheet holding unit, the reinforcing material can prevent deformation of the frame and loosening of the display sheet from its extended state due to this deformation until the display sheet holding unit is attached to a frame-shaped structure that constitutes, for example, an internally illuminated signboard as a display device. Because the reinforcing material is attached in a removable state, it can be removed from the display sheet holding unit after the display sheet holding unit is attached to the frame-shaped structure that constitutes the internally illuminated signboard. With the reinforcing material removed, the display sheet holding unit can be attached to the frame-shaped structure that constitutes the internally illuminated signboard in a state where the frame is prevented from deformation, thereby preventing the display sheet from loosening from its extended state even thereafter.

[0017] The display device of the present invention is characterized in that the above-mentioned display sheet holding unit is removably attached to a frame-like structure that constitutes the display device.

[0018] With such a display device, a display sheet holding unit, which is configured so that a translucent display sheet for advertising is held in a stretched state in a portable frame made up of frame members, can be attached to a frame-shaped structure that constitutes a display device such as an internally illuminated signboard, and the display sheet for advertising can be attached to a display device such as an internally illuminated signboard without having to perform the work of stretching the display sheet on the structure.

[0019] For example, if the advertising display material on an internally illuminated sign is replaced from an acrylic panel to an FF sheet, the sign must be removed from the building, taken back to the factory, a metal support for extension attached to the frame of the internally illuminated sign, the display sheet stretched and secured with a metal clamp, and then transported back to the construction site and reattached to the building, a laborious process required. Alternatively, a support for sheet extension must be attached to the frame of the internally illuminated sign at the construction site where the sign is already installed on the building, and the FF sheet must be stretched and secured to the attached support at the construction site with the sheet stretching clamp. Moreover, if the internally illuminated sign is installed at a high elevation on the building, this high-altitude work is inefficient. In contrast, with the display device of the present invention, the display sheet for displaying advertisements can be attached to the display device simply by attaching the display sheet holding unit, which is configured to hold the display sheet in a stretched state as described above, to the frame-shaped structure that constitutes the display device, without having to stretch the display sheet on the structure, making the work easy and simple.

[0020] According to the display device of the present invention, it is preferable that the display device has a support material into which the frame of the display sheet holding unit is fitted and a stopper that prevents the frame from detaching from the support material, and that the stopper is freely attachable and detachable to a predetermined position on the frame-shaped structure, making the display sheet holding unit replaceable.

[0021] With this configuration, simply attaching at least a support member to the frame-like structure of an existing display device such as an internally illuminated sign and then fitting the display sheet holding unit of the present invention into the existing internally illuminated sign allows for easy and secure installation. The stopper can also be a retainer for an acrylic face plate used in ordinary internally illuminated signs, or a edging material used to cover the edges of sheet-like advertising display materials.

[0022] That is, in the case of an internally illuminated sign in which the advertising display member is a resin plate such as an acrylic faceplate, the material of the advertising display member is different, and therefore the mounting structure for the advertising display member to a frame-shaped structure is significantly different compared to an internally illuminated sign in which an FF sheet is used as the advertising display member. In contrast, with the display device of the present invention, the display sheet holding unit of the present invention can be securely mounted to an existing display device such as an internally illuminated sign by simply attaching at least a support material to the frame-shaped structure that makes up the sign, as described above. Therefore, even if the advertising display member of an existing display device is a resin plate such as an acrylic faceplate, replacement work can be carried out without any problems.

[0023] According to the display device of the present invention, instead of the configuration using support material as described above, the display sheet holding unit can also be configured to be removably fastened to a frame-shaped structure that constitutes the display device by a fastening member.

[0024] In this case, it is necessary to perform work using fastening members at the work site, but since there is no need to use support materials, the number of parts can be reduced compared to when support materials are used.Since the display sheet is in a removable state, it can also be easily replaced.In order to achieve a removable state, it is preferable that the fastening members be screws.

[0025] The manufacturing method of the display sheet holding unit of the present invention is characterized in that a frame formed into a rectangular frame structure is attached to a jig that prevents deformation in a direction that narrows the space surrounded by the frame, and the display sheet is held in a stretched state by the frame attached to the jig.

[0026] In this way, the frame can be held in a state where it is prevented from deformation by the jig, and the display sheet can be reliably held in a stretched state by the frame.

[0027] According to the manufacturing method of the display sheet holding unit of the present invention, after manufacturing a display sheet holding unit to be attached to a display device by holding a display sheet in a stretched state on a frame attached to the jig, it is preferable to removably attach a reinforcing material to the display sheet holding unit to prevent the frame from deforming due to the force received from the stretched display sheet, and then release the display sheet holding unit with the reinforcing material attached from its attachment to the jig.

[0028] In this way, even if the frame of the display sheet holding unit is removed from the jig and released from its attachment to the jig, the frame is prevented from deforming due to the force received from the stretched display sheet. Therefore, the display sheet holding unit manufactured in a factory or the like can be transported without any problems to the location of the display device, such as an internally illuminated sign, at the installation site. The reinforcing material can be removed from the display sheet holding unit after the display sheet holding unit has been attached to a frame-shaped structure, such as an internally illuminated sign, while preventing the frame from deforming due to the tension of the display sheet.

[0029] The method of replacing a display unit constituting a display device of the present invention is characterized by removing the display unit from a frame-shaped structure constituting an existing display device, and removably attaching the above-mentioned display sheet holding unit to the structure from which the display unit has been removed.

[0030] In this way, the display sheet holding unit is configured with the display sheet held in a stretched state by the frame, so that simply by attaching this unit to a frame-shaped structure that constitutes a display device such as an internally illuminated sign, the display unit can be replaced in a short time without having to stretch the display sheet in the structure. Because the frame is portable, it can be easily transported from the display sheet holding unit manufacturing factory to the construction site. Because the display sheet holding unit has a unit structure in which the display sheet is held in a stretched state by the frame, it can also be easily replaced with a different display sheet holding unit. Furthermore, because the display sheet can be attached to and removed from a display device such as an internally illuminated sign without releasing the stretched state, maintenance of the lighting device inside the sign can also be easily performed.

[0031] According to the method for replacing the display unit constituting a display device of the present invention, the display unit in an existing display device is made of a resin plate, and it is preferable to use a flexible face sheet as the display sheet in the display sheet holding unit.

[0032] In this way, even when changing the display section from a resin plate to a flexible face sheet, the work can be easily done by simply attaching the display sheet holding unit, in which the display sheet for advertising display is held in a stretched state on a portable frame, to a frame-shaped structure in a display device such as an internally illuminated signboard.

[0033] According to the method for replacing a display unit constituting a display device of the present invention, it is preferable to use a non-flammable sheet as the flexible face sheet.

[0034] In this way, the resin plate, which is generally not non-flammable, can be replaced with a non-flammable flexible face sheet.

[0035] According to the method for replacing the display unit that constitutes the display device of the present invention, it is preferable to remove the display unit from the frame-shaped structure that constitutes the existing display device, and then attach a display sheet holding unit with the above-mentioned reinforcing material attached to the frame-shaped structure from which the display unit has been removed, in a state that prevents the frame from being deformed by the force received from the stretched display sheet and in a state that allows it to be removed from the structure, and then remove the reinforcing material from the display sheet holding unit.

[0036] In this way, even if the reinforcing material is removed from the frame of the display sheet holding unit, the frame-shaped structure prevents the frame from deforming due to the force received from the stretched display sheet, and the display sheet holding unit can be installed on a display device such as an internally illuminated signboard. [Effects of the Invention]

[0037] According to the present invention, it is possible to simply and easily mount and release an advertising display member on a display device such as an internally illuminated signboard. [Brief explanation of the drawings]

[0038] [Figure 1] 1 is an exploded view of a display sheet holding unit for a display device according to an embodiment of the present invention; [Figure 2] FIG. 2 is a diagram showing the receiving member in FIG. [Figure 3] FIG. 2 is a bottom view of a corner portion of the frame in FIG. [Figure 4] FIG. [Figure 5] FIG. 2 is a diagram showing a pressing member in FIG. [Figure 6] 10 is a diagram showing a state in which the edge of the display sheet is sandwiched between the receiving member and the pressing member to put the display sheet into a stretched state. FIG. [Figure 7] 10A and 10B are diagrams showing a state in which a display sheet is held in a stretched state by a frame attached to a jig. [Figure 8] 10 is a diagram showing a state in which a reinforcing material is attached to the display sheet holding unit. FIG. [Figure 9] 10 is a cross-sectional view of a main part showing a structure in which a display sheet holding unit is attached to a frame structure in an internally illuminated signboard. FIG. [Figure 10] FIG. 1 is a diagram showing the cross-sectional structure of an internally illuminated signboard. [Figure 11] 10 is a cross-sectional view of a main part showing another structural example in which a display sheet holding unit is attached to a frame-shaped structure in an internally illuminated signboard. FIG. [Figure 12] 10 is a cross-sectional view of a main part showing yet another structural example in which a display sheet holding unit is attached to a frame-shaped structure in an internally illuminated signboard. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0039] As shown in Fig. 1, the display sheet holding unit for a display device according to an embodiment of the present invention includes a frame 12 having a frame structure with a receiving member 11, and a retaining member 14 for holding a light-transmitting display sheet 13 for advertising display in a stretched state on the frame 12. The frame 12 has a structure similar to a picture frame, in which a space 15 is formed in the area surrounded by the frame members that form the frame 12, and is formed in a rectangular shape in the illustrated example. The display sheet 13 is an FF sheet. The retaining member 14 is made up of rod-shaped members that correspond to each side of the rectangular frame 12.

[0040] In the illustrated example, the receiving member 11 is formed by an extrusion of aluminum in the form shown in FIG. 2. Referring to the cross-sectional structure shown in FIG. 2, the receiving member 11 has a bottom portion 17, which is formed with a bottom groove 18 having a rectangular cross section for accommodating a bottom corner fitting, i.e., a bottom connecting member, described below. A raised surface 19 is formed on the side of the receiving member 11 in a direction intersecting, for example, perpendicular to, the bottom portion 17. A recess 20 having a rectangular cross section is formed between the raised surface 19 and the bottom portion 17. A thick portion 21 is formed in the center of the bottom of the recess 20, protruding toward the opening of the recess 20. A fine guide groove 22 is formed in the center of the thick portion 21. A rounded surface 23 that is continuous with the raised surface 19 is formed at the end of the raised surface 19, located vertically away from the bottom portion 17. An upwardly inclined surface 24 is formed continuous with the curved surface 23 on the side of the receiving material 11 opposite the rising surface 19. The inclined surface 24 inclines in the direction away from the rising surface 19 as it moves away from the curved surface 23, i.e., as it approaches the bottom 17. A side groove 25 having a rectangular cross section is formed between the inclined surface 24 and the bottom 17 on the side opposite the side on which the rising surface 19 is formed. The side groove 25 is formed so that its bottom surface is perpendicular to the bottom 17, similar to the rising surface 19. A hollow recessed portion 26 is formed in the receiving material 11. The formation of the recessed portion 26 contributes to reducing the weight of the receiving material 11.

[0041] As described above, the receiving member 11 is made of an extrusion molded product. Therefore, the above-mentioned portions 17 to 26 shown in the cross-sectional structure shown in Fig. 2 are all formed along the length of the receiving member 11.

[0042] As shown in Figure 1, frame 12 is formed into a rectangular frame structure by four support members 11. The longitudinal ends of support members 11 are cut at 45 degrees, and support members 11 are joined to each other with the end faces of the 45-degree cut portions in contact with each other. In frame 12, inclined surfaces 24 of support members 11 are arranged to face inward of frame 12 of the frame structure, and raised surfaces 19 are arranged to face outward of frame 12, and recesses 20 of support members 11 are formed so that their openings face outward of the frame of the frame structure.

[0043] The joining structure between the receiving members 11 will now be described. As shown in Fig. 3, at the portion where the end faces of the receiving members 11 contact each other, i.e., at the corner portion of the rectangular frame 12, a metal plate-like bottom connecting member 27 that is L-shaped in plan view is fitted into the bottom groove 18 across the bottoms 17 of the receiving members 11 that are in contact with each other. One side of the L-shape of the bottom connecting member 27 is fixed to one receiving member 11 with a screw 28, and the other side of the L-shape is fixed to the other receiving member 11 with a screw 28, thereby fixing these receiving members 11, 11 to each other.

[0044] As shown in Fig. 4, at the corners of the rectangular frame 12, the side grooves 25 of the receiving members 11 are arranged so as to face inward of the frame 12 of the framework structure. At the corners shown in Fig. 3, L-shaped metal plate-like side connecting members 29, whose plate surfaces form a 90-degree angle with each other, are fitted across the side grooves 25 of the receiving members 11 that are in contact with each other. One side of the L-shape of the side connecting member 29 is fixed to one receiving member 11 with a screw 28, and the other side of the L-shape is fixed to the other receiving member 11 with a screw 28, thereby fixing these receiving members 11, 11 to each other.

[0045] That is, the support members 11, 11 at the corners are firmly connected to each other by fixing the bottom connecting members 27 and the side connecting members 29 with screws 28. This allows the frame 12 to be configured as a member with the required frame strength.

[0046] The pressing member 14 will now be described. As shown in FIG. 5, the pressing member 14 is formed of an extruded aluminum, similar to the receiving member 11. Referring to the cross-sectional structure shown in FIG. 5, the pressing member 14 has a protruding portion 31 that can fit into the recessed portion 20 of the receiving member 11. At the tip of the protruding portion 31, as shown in FIGS. 7 to 9, a shallow recessed portion 32 having a rectangular cross section is formed so that the shallow recessed portion 21 of the receiving member 11 faces the thick portion 21 of the receiving member 11 when the protruding portion 31 fits into the recessed portion 20 of the receiving member 11. The thick portion 21 can fit into the shallow recessed portion 32 when the protruding portion 31 fits into the recessed portion 20. As a result of the formation of this shallow recessed portion 32, a pair of small protrusions 33, 33 are formed at the tip of the protruding portion 31 at positions corresponding to both ends of the shallow recessed portion 32 in the width direction. A receiving groove 34 is formed in the portion of the protruding portion 31 opposite the shallow recessed portion 32, i.e., in the base end of the protruding portion 31. A guide groove 35 having a configuration similar to that of the guide groove 22 of the receiving member 11 is formed in the center of the bottom of the receiving groove 34. Fig. 1 and Figs. 6 and 9 described below show fixing screws 36 for fixing the presser member 14 to the receiving member 11, and the fixing screws 36 are flat head screws. The side walls of the receiving groove 34 are shaped to be inclined in order to accommodate the heads of the fixing screws 36, which are flat head screws.

[0047] As shown in FIG. 5 , the presser member 14 has a raised portion 38 formed integrally with the raised portion 31 in a direction intersecting the protruding direction of the protruding portion 31, e.g., perpendicular to the protruding direction of the raised portion 31, similar to the raised surface 19 of the receiving member 11 shown in FIG. 2 . The raised portion 38 is configured to face the raised surface 19 of the receiving member 11 when the protruding portion 31 enters the recess 20 of the receiving member 11. An attachment portion 39 is integrally formed, continuing from the raised portion 38. The presser member 14 is formed so that the raised portion 38 and the attachment portion 39 form an L-shaped cross section. That is, the attachment portion 39 is formed to protrude from the rising end of the raised portion 38 in a direction opposite to the protruding direction of the protruding portion 31, parallel to the protruding direction of the protruding portion 31. A thick portion 40 is formed at the protruding end of the attachment portion 39. A contact surface 41 is formed at the end of the thick portion 40 opposite the rising direction of the raised portion 38.

[0048] A method for attaching the display sheet 13 in a stretched state to the frame 12 shown in Fig. 1 will be described. First, the rectangular frame 12 shown in the figure is placed horizontally, and then the rectangular display sheet 13, which is larger than the frame 12, is placed over the entire frame 12. Then, as shown in Fig. 6, the edge 44 of the display sheet 13 hangs down from the curved surface 23 of the receiving material 11 along the rising surface 19. Furthermore, the edge 44 covers the recess 20 of the receiving material 11 and hangs further downward than the recess 20.

[0049] Next, as shown in the figure, the protrusion 31 of the pressing member 14 is fitted into the recess 20 of the receiving member 11 together with the edge 44 of the display sheet 13, and the pressing member 14 is fixed to the receiving member 11 using fixing screws 36, i.e., multiple drill screws 46 with cutting edges 45, as shown in Figures 6 and 9. At this time, it is preferable to cover the metal protrusion 31 with a rubber sheet 47 as shown in the figure. Covering the rubber sheet 47 prevents the resin display sheet 13 from being damaged and also provides cushioning.

[0050] Specifically, as shown in FIG. 6 , first, the pointed end 48 of the cutting edge 45 of the drill screw 46 is pressed against the guide groove 35 of the presser member 14, and the drill screw 46 is screwed into the protrusion 31 of the presser member 14 from the side of the receiving groove 34. Furthermore, although not shown, the drill screw 46 is also screwed through the rubber sheet 47 and the edge 44 of the display sheet 13. In this state, the drill screw 46, which is a flat head screw, is screwed into the protrusion 31 until its head 49 enters the receiving groove 34. The completed state of screwing can be seen in FIGS. 7 to 9 . As a result, the edge 44 of the display sheet 13 through which the drill screw 46 has penetrated is positioned and held relative to the protrusion 31 through which the drill screw 46 has penetrated. At this time, the cutting edge 45 of the drill screw 46 protrudes from the protrusion 31 and the edge 44 of the display sheet 13.

[0051] The protrusion 31 of the holding member 14, which holds the edge 44 of the display sheet 13 with the drill screw 46, is positioned to correspond to the recess 20 of the receiving member 11. Then, as can be seen from FIGS. 6 and 9, the end 48 of the cutting edge 45 of the drill screw 46, which protrudes from the protrusion 31 and the edge 44 of the display sheet 13, is pressed against the guide groove 22 in the thick portion 21 on the bottom side of the recess 20 of the receiving member 11, and the drill screw 46 is screwed into the thick portion 21. FIGS. 7 to 9 show the state after the screwing is completed. At this time, the protrusion 31 of the holding member 14 is fitted into the recess 20 of the receiving member 11.

[0052] When the drill screw 46 is screwed into the protrusion 31 of the holding member 14, it forms an internal thread in the protrusion 31. When the drill screw 46 is screwed into the thick-walled portion 21 of the receiving member 11, the internal thread formed in the protrusion 31 of the holding member 14 is crushed, and the drill screw 46 is thereby able to rotate freely relative to the protrusion 31, and is screwed into the thick-walled portion 21 without any problems.

[0053] When the protrusions 31 of the holding member 14, which hold the edge 48 of the display sheet 13, are fitted into the recesses 20 of the receiving member 11 by threading the drill screws 46, the display sheet 13, which is held in position by the protrusions 31 with the drill screws 46 penetrating the display sheet 13, is stretched in its surface direction by the depth of the recesses 20. The display sheet 13 is subjected to a tensioning force by the protrusions 31 and the recesses 20 around the entire periphery of the rectangular frame 12, and is firmly stretched. At this time, the stretching action causes the display sheet 13 to move while in contact with the surface of the receiving member 11, and the direction of movement changes at the curved surfaces 23 under the tensioning force. However, because the curved surfaces 23 do not have sharp corners, the display sheet 13 can smoothly change direction along the curved surfaces 23. This prevents accidents such as damage to the display sheet 13 due to interaction with the receiving member 11.

[0054] Once the projection 31 has been fitted into the recess 20, that is, once the drill screw 46 has been screwed into the thick portion 21 of the recess 20, the display sheet 13 is fixed and held to the frame 12 with its edge 44 sandwiched between the tip of the projection 31 and the bottom of the recess 20, as shown in FIG. 9 , in which some reference numerals are omitted. At this time, the display sheet 13 is also sandwiched between the shallow recess 32 of the projection 31 and the thick portion 21 of the recess 20, with its edge 44 hanging on the small protrusion 33 formed on the projection 31. As a result, the display sheet 13 is held in a stretched state by the frame 12 with its edge 44 firmly sandwiched between the receiving member 11 and the pressing member 14. This completes the display sheet holding unit 50 for an internally illuminated sign.

[0055] The frame 12 is portable, i.e., can be carried, and therefore the display sheet holding unit 50, which holds the display sheet 13 in a stretched state on the frame 12, can also be carried.

[0056] If the frame 12 has sufficient strength to withstand the tension of the display sheet 13, the display sheet 13 can be directly attached in a stretched state to the frame 12 placed on a workbench, for example, as described above. However, if the frame 12 does not have sufficient strength and there is a risk that the display sheet 13 will deform due to the tension of the display sheet 13, measures must be taken. In that case, there is a risk that the display sheet 13, once stretched, will become loose, or that the frame 12 will become deformed, resulting in a unit consisting of the frame 12 and the display sheet 13.

[0057] As a countermeasure, for example, the following method can be used. That is, as shown in FIG. 7, a jig 52 is fixed to a workbench 51. This jig 52 is formed, for example, by an L-shaped member as shown in the figure, with outer dimensions corresponding to the inner dimensions of the frame 12. Therefore, as shown in the figure, the frame 12 can be installed on the workbench 51 with the jig 52 fitted to it. In this state, the display sheet 13 is attached to the frame 12 in a stretched state using the retaining member 14, as described above. Then, the frame 12 is subjected to a stretching force from the display sheet 13. This stretching force acts on the frame 13 in a direction that narrows the space 15, i.e., in a direction that causes the display sheet 13 to slacken. However, because the frame 12 is fitted to the jig 52, it is supported by the jig 52 and is prevented from being deformed by the stretching force from the display sheet 13. In other words, by using the jig 52, it is possible to construct a display sheet holding unit 50 in which the display sheet 13 is held and fixed in the required stretched state on the frame 12 while preventing deformation of the frame 12.

[0058] Thereafter, as shown in FIG. 8 , a reinforcing member 53 capable of preventing deformation of the frame 12 due to the tension of the display sheet 13 is removably attached to the display sheet holding unit 50. The reinforcing member 53 may have any configuration as long as it has this function. In the example shown in FIG. 8 , the reinforcing member 53 is composed of a hollow rectangular bar formed by extruding aluminum. The reinforcing member 53 is disposed across a pair of support members 11, 11 arranged opposite each other in the rectangular frame 12, and one end and the other end are removably attached to the mounting portions 39, 39 of the holding members 14, 14, respectively, with screws 54. The reinforcing member 53 has a spacer 55 through which the screw 54 passes, and the spacer 55 is configured to install the hollow rectangular bar away from the display sheet 13. This prevents the reinforcing member 53 from contacting the display sheet 13 and adversely affecting the sign design applied to the display sheet 13. A single reinforcing member 53 may be used, or a plurality of reinforcing members 53 may be used arranged in the same direction or in different directions.

[0059] Next, we will explain how to attach the display sheet holding unit 50 to a frame-shaped structure in an internally illuminated signboard. FIGS. 9 and 10 show an example of the configuration of an internally illuminated signboard 60 equipped with the display sheet holding unit 50. FIG. 10 is a cross-sectional plan view of the internally illuminated signboard 60 attached to the exterior wall of a building (not shown) via a bracket 61. The internally illuminated signboard 60 has a frame-shaped structure 62 equipped with reinforcing beams 59. The structure 62 is fixed to the exterior wall so as to protrude horizontally from the exterior wall to which the brackets 61 are attached. The structure 62 is equipped with a light source 63 such as an LED or fluorescent lamp. In the illustrated example, the structure 62 has an angle beam 64 with an L-shaped cross section. A sheet metal edge cover 65 that forms the edge of the internally illuminated signboard 60 is attached to the angle beam 64.

[0060] As shown in Figure 9, a support material 66 is fixed to an angle iron 64 with screws 67. A plurality of short support materials 66 are fixed along the length of the angle iron 64. The support material 66 has a recess 68, which can accommodate a portion of the receiving material 11 in the display sheet holding unit 50 along the length and a portion of the pressing material 14 along the length, in a mutually integrated state. However, the mounting portion 39 of the pressing material 14 is not accommodated in the recess 68, and the contact surface 41 of the thick portion 40 is configured to come into direct or indirect contact with the angle iron 64 when the receiving material 11 is accommodated in the recess 68.

[0061] With this configuration, the display sheet holding unit 50 has the receiving member 11 and a part of the pressing member 14 housed in the recesses 68 of the plurality of support members 66 fixed to the frame-shaped structure 62 .

[0062] In this state, a stopper flaps 69 is attached to the edge cover 65 with screws 70. The stopper flaps 69 is positioned so that the mounting portion 39 of the pressure member 14 is sandwiched between the flaps 69 and the angle member 64. This prevents the display sheet holding unit 50 from coming off the recess 68 of the support member 66. As a result, the display sheet holding unit 50 is held to the structure 62, and the internally illuminated sign 60 is completed. The edge cover 65 and the flaps 69 function as a border for the advertising display member made up of the display sheet 13.

[0063] With this configuration, a display sheet holding unit 50 with the display sheet 13 installed in a stretched state on the frame 12 is prepared in advance, and this display sheet holding unit 50 is then fitted into a recess 68 of a support material 66 attached to a frame-shaped structure 62, and the flaring is prevented by a pressing material 69.This allows an internally illuminated sign 60 such as that shown in Figure 10 to be constructed easily and reliably at the construction site without having to stretch the display sheet 13.

[0064] In such an internally illuminated sign 60, the receiving material 11 of the holding unit 50 is housed in the recess 68 of the support material 66, so the tension applied to the receiving material 11 by the display sheet 13 is received by the support material 66. This reliably prevents the receiving material 11 from being deformed by the tension of the display sheet 13, and prevents the display sheet 13 from becoming loose due to the deformation of the receiving material 11. If a reinforcing member 53 is attached to the display sheet holding unit 50 as shown in FIG. 8, after fitting the receiving material 11 and a portion of the pressing member 14 of the display sheet holding unit 50 into the recess 68 of the support material 66 as described above, the reinforcing member 53 can be removed from the display sheet holding unit 50 without any problems.

[0065] The display sheet holding unit 50 can easily replace an acrylic plate used as an advertising display material with a display sheet 13 in an existing internally illuminated sign. Even in existing internally illuminated signs that use acrylic plate, the structure 62 typically includes an angle bar 64 and an edge cover 65, and the edge of the acrylic plate is typically held in place by sandwiching it between the angle bar 64 and a flammable edge material 69. When replacing the existing acrylic plate with, for example, a non-flammable display sheet 13, the flammable edge material 69 is removed from the edge cover 65, and the acrylic plate is then removed from the internally illuminated sign 60 and removed. Next, a plurality of support members 66 are attached to the angle bar 64. Then, the display sheet holding unit 50, with the display sheet 13 previously attached to the frame 12 in a stretched state, is carried to the installation location of the internally illuminated sign 60, and the receiving member 11 and part of the pressing member 14 are housed in the recess 68 of the support member 66, and the contact surface 41 of the thick portion 40 of the mounting portion 39 of the pressing member 14 is brought into direct or indirect contact with the angle iron 64. Furthermore, by attaching the pressing edge member 69 while maintaining this state, the display sheet holding unit 50 is attached to the frame-shaped structure 62 in a positioned state.

[0066] In this way, there is no need to stretch the display sheet 13 at the construction site, making the work easy and simple. Also, by simply removing the battening material 69, the display sheet holding unit 50 can be removed from the frame-shaped structure 62 without releasing the stretched state of the display sheet 13. This makes it easy to perform maintenance work on the light source 63, for example. The display sheet holding unit 50 itself can also be easily replaced.

[0067] The support member 66 may have any configuration as long as it performs the above-mentioned functions. Fig. 11 shows another structural example of the support member 66. The support member 66 in Fig. 11 has a pair of angle members 73 with an L-shaped cross section, which are symmetrically arranged and attached to the angle members 64 of the structure 62 with screws 74, and an L-shaped member 76 is placed between the tip ends 75 of the pair of angle members 73 at a position spaced apart from the angle members 64 of the structure 62. Note that Fig. 11 does not show one of the pair of angle members 73. The angle members 73 and the L-shaped member 76 can be integrated by welding or the like.

[0068] With this configuration, the L-shaped member 76 and the end 77 of the angle member 73 can form a recess 68 similar to the support member 66 shown in Figure 9, and this recess 68 can accommodate the receiving member 11 and part of the pressing member 14 of the display sheet holding unit 50.

[0069] FIG. 12 shows an example in which the display sheet holding unit 50 is attached to a frame-shaped structure 62 without using the support material 66 shown in FIGS. 9 and 11. In this example, the mounting portion 39 of the pressing member 14, with the contact surface 41 of the thick portion 40 in contact with the angle material 64 of the structure 62, is fixed to the angle material 64 with a screw 80. With this configuration, fastening work with the screw 80 is required, but since there is no need to use the support material 66, the number of parts can be reduced accordingly. In this case, the display sheet holding unit 50 can be reliably fixed to the angle material 64 of the structure 62 with the screw 80. In this case, deformation of the receiving material 11 due to the tension force of the display sheet 13 can also be reliably prevented. [Explanation of symbols]

[0070] 11 Support material 12 frames 13 Display sheet 14 Clamp 15 Space 20 recess 21 Thick wall part 31 Convex part 32 Shallow recess 33 small protrusion 36 Fixing screw 39 Mounting part 41 Contact surface 44 Edge 46 Self-drilling screws 50 Display sheet holding unit 62 Frame-like structures 66 Support Material 68 Recess 69 Edge material

Claims

1. a display sheet holding unit for holding the display sheet in a stretched state; The display sheet holding unit has a frame formed in a rectangular frame structure and a pressing member attached to the frame, The frame has a receiving member formed so that an opening direction of the recessed portion faces outward from the frame of the frame structure, and the pressing member has a protruding portion that fits into the recessed portion of the receiving member, When the pressing member is attached to the frame, the recessed portion of the receiving member receives the edge of the display sheet, and the edge of the display sheet is sandwiched and fixed between the protruding portion of the pressing member and the recessed portion of the receiving member, The display sheet holding unit is characterized in that the display sheet holding unit is portable.

2. A display sheet holding unit as described in claim 1, wherein the pressing member has a raised portion formed in a direction intersecting the protruding direction of the convex portion and formed integrally with the convex portion, and an attachment portion is formed integrally and contiguous with the raised portion, and the attachment portion is attachable to a display device to which the display sheet holding unit is attached.

3. 2. The display sheet holding unit according to claim 1, wherein the frame of the frame structure has connecting members for fixing and joining adjacent receiving members to each other at corners of the frame structure.

4. 2. The display sheet holding unit according to claim 1, further comprising a reinforcing member removably attached to prevent the frame from being deformed by the force of the stretched display sheet.

5. 5. A display device, comprising: a frame-like structure constituting the display device; and a display sheet holding unit according to claim 1 attached in a detachable state to the frame-like structure constituting the display device.

6. A display device as described in claim 5, characterized in that it has a support material into which the frame of the display sheet holding unit is fitted and a stopper that prevents the frame from coming off the support material, and the stopper can be freely attached and detached to a predetermined position on the frame-shaped structure, making the display sheet holding unit replaceable.

7. 7. The display device according to claim 6, wherein the display sheet holding unit is removably fastened to a frame-like structure constituting the display device by a fastening member.

8. This method for manufacturing a display sheet holding unit is characterized in that a frame formed in a rectangular frame structure is attached to a jig that prevents deformation in a direction that narrows the space surrounded by the frame, and the display sheet is held in a stretched state by the frame attached to the jig.

9. A method for manufacturing a display sheet holding unit as described in claim 8, characterized in that after manufacturing a display sheet holding unit to be attached to a display device by holding a display sheet in a stretched state on a frame attached to the jig, a reinforcing material is removably attached to the display sheet holding unit to prevent the frame from deforming due to the force received from the stretched display sheet, and then the display sheet holding unit with the reinforcing material attached is released from its attachment to the jig.

10. A method for replacing a display unit constituting a display device, characterized by removing the display unit from a frame-shaped structure constituting an existing display device, and removably attaching a display sheet holding unit described in any one of claims 1 to 4 to the structure from which the display unit was removed.

11. 11. The method for replacing a display part constituting a display device according to claim 10, wherein the display part of the existing display device is made of a resin plate, and a flexible face sheet is used as the display sheet in the display sheet holding unit.

12. 12. The method for replacing a display unit constituting a display device according to claim 11, wherein a non-flammable sheet is used as the flexible face sheet.

13. A method for replacing a display unit constituting a display device, characterized by removing the display unit from a frame-shaped structure constituting an existing display device, attaching the display sheet holding unit described in claim 4 to the frame-shaped structure from which the display unit has been removed in a state that prevents the frame from deforming due to the force received from the stretched display sheet and in a state that allows it to be removed from the structure, and then removing the reinforcing material from the display sheet holding unit.

Images