Projection screen device and method for replacing screen sheet of projection screen device

Abstract

To provide a screen for projection with which it is possible to carry out the work of replacing a screen sheet having been wound and urged, easily with fewer replacement members.SOLUTION: A screen for projection comprises a screen sheet 2, a winding roll 3 for winding the screen sheet 2 and connected to the base end side of the screen sheet 2, a support part 4 for rotatably supporting the winding roll 3, and a rotationally urging member for urging the winding roll 3 to rotate, and is designed to cause the winding roll 3 to rotate around the axis of the winding roll 3 by an urging force of the rotationally urging member and wind up the screen sheet 2. A lock member 6 is provided, which is engaged with the winding roll 3 and the support part 4 and enables the rotation of the winding roll 3 to be temporarily stopped, and the screen sheet 2 is further made to be attachable / removable from the winding roll 3, enabling the screen sheet 2 to be replaced with a screen sheet 8 for replacement which is wound up on a cylindrical winding core 15 while the rotation of the winding roll 3 is temporarily stopped by the lock member 6.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a projection screen device and a method for replacing a screen sheet of a projection screen device, and more particularly to a projection screen device and a method for replacing a screen sheet of a projection screen device that allows the replacement of a rolled-up screen sheet to be easily performed using a small number of replacement parts. [Background technology]

[0002] Conventionally, there has been a magnetic screen device that includes a screen sheet having a screen surface on the front side and an adhesive layer on the back side, an axial member as a winding shaft that winds up the screen sheet with the screen surface facing inward, and a support member that rotatably supports the axial member, thereby enabling the screen sheet to be attached and spread out on the surface to be attached or to be wound up (see Patent Document 1).

[0003] There is also a magnetic screen device that has a screen sheet that has a screen surface on the front side and magnetic force on the rear side, a winding roll that winds up the screen sheet, and pulls the screen sheet out until it is stretched and sticks it to the surface to be stuck from the free end side (see Patent Document 2). Furthermore, a general spring-winding type screen device that is not magnetically attached is also widely known. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2020-98256 [Patent Document 2] JP 2016-38475 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in these projection screen devices, when the screen sheet needs to be replaced, for example, because it has become wrinkled or dirty, the screen sheet has to be replaced together with the winding roll.The winding roll of these screen devices has a spring member provided therein as a rotation means for urging the screen sheet to rotate in the winding direction, so naturally this spring member also needs to be replaced together with the screen sheet and the winding roll, resulting in the problem of wasted parts.

[0006] Therefore, in view of the above-mentioned situation, the present invention aims to solve the problem by providing a projection screen that allows the replacement of a rolled-up and biased screen sheet to be easily performed using a small number of replacement parts. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the projection screen device of the present invention is a projection screen device comprising: a screen sheet having a screen surface on its front side; a take-up roll connected to the base end side of the screen sheet and winding up the screen sheet; a support part rotatably supporting the take-up roll; and a rotation biasing member that applies a rotation biasing force to the take-up roll, wherein the biasing force of the rotation biasing member causes the take-up roll to rotate around the axis of the take-up roll, thereby winding up the screen sheet. A first hole is provided in the support portion, and a second hole is provided in the winding roll at a position corresponding to the first hole in the screen sheet replacement posture, and the screen sheet is inserted into the first hole and the second hole, A locking member is provided that can engage with the winding roll and the support portion to temporarily stop the rotation of the winding roll, and the screen sheet is detachable from the winding roll, so that while the rotation of the winding roll is temporarily stopped by the locking member, the screen sheet can be replaced with a replacement screen sheet wound around a cylindrical winding core.

[0008] According to this configuration, in a projection screen device in which the screen sheet is wound and biased, While the rotation of the winding roll is temporarily stopped by the locking member, the screen The screen sheet can be replaced with a replacement screen sheet, reducing the work required to replace the screen sheet. This allows replacement to be easily performed using replacement parts that do not require any special equipment. Furthermore, the rotation of the winding roll can be stopped simply by inserting the locking member in the replacement position.

[0009] It is also preferable that the locking member stops the rotation of the take-up roll when the screen sheet is completely pulled out and the connecting portion between the screen sheet and the take-up roll is exposed.

[0010] With this configuration, when the rotation of the winding roll is stopped, the connection portion between the screen sheet and the winding roll is exposed, making it easier to remove or install the screen sheet and also easier to replace the screen sheet.

[0013] Furthermore, it is more preferable that an engaging portion for engaging with the winding roll is provided on the base end side of the screen sheet, and that a recess extending in the axial direction and an engaged portion with which the engaging portion engages within the recess are provided on the outer peripheral surface of the winding roll.

[0014] According to this configuration, the engaging portion is attached to the engaged portion within a recess on the outer periphery of the winding roll, so that the connecting portion does not protrude from the outer periphery of the winding roll, making it less likely that the wound screen sheet will be wrinkled or scratched.

[0015] It is more preferable that the support portion has a notch at a position corresponding to the engaged portion of the winding roll, the notch being formed at a position extending in the longitudinal direction from the engaged portion.

[0016] According to this configuration, when removing the screen sheet from the winding roll, the engaging portion of the screen sheet can be pulled out along the longitudinal direction of the recess, making it easier to remove the screen sheet from the winding roll.

[0017] It is more preferable that the cylindrical winding core accommodates at least a portion of the free end side of the replacement screen sheet therein.

[0018] With this configuration, the replacement screen sheet can be rolled up for transport and storage without wrinkles or scratches, and by attaching the replacement screen sheet to the winding roll in this state or with the engagement portion slightly pulled out from this state, the screen sheet can be easily attached even in a narrow space.

[0019] Furthermore, a projection screen device includes a screen sheet having a screen surface on the front side, a take-up roll connected to the base end side of the screen sheet and winding up the screen sheet, a support part that rotatably supports the take-up roll, and a rotational biasing member that rotationally biases the take-up roll, and the screen sheet is wound up by rotating the take-up roll around its axis by the biasing force of the rotational biasing member, and a locking member that can engage with the take-up roll and the support part to temporarily stop the rotation of the take-up roll can be provided, and a method for replacing the screen sheet of a projection screen device in which the screen sheet of a projection screen device in which the screen sheet is detachable from the take-up roll is replaced with a replacement screen sheet wound around a cylindrical winding core while the rotation of the take-up roll is temporarily stopped by the locking member can be used. [Effects of the Invention]

[0020] According to the configuration of the present invention, it is possible to provide a projection screen in which the replacement of the rolled-up and biased screen sheet can be easily performed using a small number of replacement parts. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a perspective view showing a state in which the projection screen device according to the present invention is used. [Figure 2]FIG. 2 is a perspective view showing the configuration of the projection screen device. [Figure 3] 10 is a partially exploded enlarged view showing a method of using the locking member of the projection screen device. FIG. [Figure 4] FIG. 10 is a partially enlarged cross-sectional view showing the state in which the locking member of the projection screen device is inserted. [Figure 5] FIG. 10 is a partially enlarged vertical cross-sectional view showing the state in which the locking member of the projection screen device is inserted. [Figure 6] FIG. 10 is a perspective view showing the configuration of a replacement screen sheet for the projection screen device. [Figure 7] FIG. 10 is a perspective view showing a method for replacing the screen sheet of the projection screen device. [Figure 8] FIG. 10 is a perspective view showing a projection screen apparatus according to another embodiment of the present invention. [Figure 9] FIG. 10 is a perspective view showing a projection screen apparatus according to still another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] The configuration of an embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 5. However, the present invention is not limited to the forms shown in the accompanying drawings and includes all embodiments that satisfy the requirements set forth in the claims.

[0023] As shown in FIG. 1, a projection screen device 1 according to an embodiment of the present invention can be mounted on a blackboard, for example, using a magnet. As shown in FIGS. 2 and 3, the projection screen device 1 comprises a screen sheet 2, a winding roll 3 connected to the base end of the screen sheet 2 and winding up the screen sheet 2, a support section 4 that rotatably supports the winding roll 3, and a rotational biasing member that applies a rotational bias to the winding roll 3. The winding roll 3 is rotated around its axis by the biasing force of the rotational biasing member, thereby winding up the screen sheet 2. A locking member 6 is provided that can engage with the winding roll 3 and the support section 4 to temporarily stop the rotation of the winding roll 3. The screen sheet 2 is detachable from the winding roll 3, and while the rotation of the winding roll 3 is temporarily stopped by the locking member 6, the screen sheet 2 can be replaced with a replacement screen sheet 8 wound around a cylindrical winding core 15.

[0024] Here, the projection screen device 1 is simple in configuration and lightweight, making it easy to carry, but it is not limited to this and may have other configurations, such as one that is installed on a wall or ceiling, or one that is assembled into other products, and may also be used for purposes other than projection, such as a partition or curtain.

[0025] The screen sheet 2 is a sheet having a screen surface 2a on the front side and a magnet on the back side, and is configured to be wound up in a roll around a winding roll 3 with the front side facing outward. The rolled screen sheet 2 has the effect of maintaining its rolled state by the action of the magnet on the back side, but the screen sheet 2 does not need to have a magnet as long as at least a portion of it functions as a projection screen, and may also be equipped with a member that has another function, such as a stretchable sheet, that does not function as a projection screen. The screen sheet 2 is provided with an engagement portion 10 on the base end that engages with the winding roll 3, and an end bar 5 on the tip end.

[0026] The winding roll 3 has a substantially cylindrical shape, and the screen sheet 2 is wound around the outside. The winding roll 3 has, on its outer peripheral surface, a recess 12 extending in the axial direction, and an engaged portion 11 that engages with the engaging portion 10 of the screen sheet 2 within the recess 12. The engaged portion 11 is formed to protrude inward so as to narrow the opening of the recess 12, and the engaging portion 10 of the screen sheet 2 engages with the engaged portion 11, thereby attaching the screen sheet 2 to the winding roll 3. The winding roll 3 is rotationally biased in the direction of winding up the screen sheet 2 by a rotation biasing member. This rotation bias is exerted by a rotation biasing member (spring member) provided inside the winding roll 3, and the spring member is provided to rotate the winding roll 3 relative to shaft members 7 for rotation support attached to both ends of the winding roll 3, so that the winding roll 3 attached to the support portion 4 is rotationally biased via the shaft members 7.

[0027] The support portion 4 supports the winding roll 3 in a state in which the winding roll 3 is rotationally biased. As a result, for example, when the support portion 4 is attached and fixed to the wall surface to be attached, the winding roll 3 is basically rotationally biased in the direction in which the screen sheet 2 is wound up.

[0028] 4 and 5, holes 8 and 9 for engaging the locking member 6 are provided in the support part 4 and the winding roll 3. A first hole 8 is provided in the support part 4, and a second hole 9 is provided in the winding roll 3 at a position corresponding to the first hole 8 in the screen sheet 2 replacement position. These overlap in the screen sheet replacement position, and in this state, by inserting the locking member 6 into the first hole 8 and the second hole 9, the rotation of the winding roll 3 is temporarily stopped.

[0029] The first holes 8 are provided on the side surfaces of the support part 4, which makes it relatively easy to insert the locking member 6, but the position is not limited to this, and they may be provided, for example, on a long member including the handle of the support part 4. Furthermore, four second holes 9 are provided on each side surface of the winding roll 3, which makes it easy to insert the locking member 6 into the second holes 9 that are not visible, but the position is not limited to this, and it is sufficient that the second holes 9 are provided at least in positions corresponding to the first holes 8. For example, it is possible to make the locking member 6 easier to insert by configuring them as long holes in an arc shape.

[0030] The locking member 6 is formed by bending a rod. By inserting a straight insertion portion formed at one end into the first hole 8 and the second hole 9, the winding roll 3 and the support portion 4 are locked together, thereby stopping the rotation of the winding roll 3. The other end of the locking member 6 is formed with a retaining portion 6a that can be hooked onto the support portion 4 to prevent the locking member 6 from easily coming out of the first hole 8 and the second hole 9. When replacing the screen sheet 2, hooking the retaining portion 6a onto the support portion 4 prevents the locking member 6 from falling off, thereby making the screen sheet 2 replacement work safer. Alternatively, a portion of the locking member 6 may be magnetically attracted to a magnet provided on the support portion 4 to prevent it from falling off. Because the locking member 6 stops the rotation of the winding roll 3, it must be configured to be sufficiently capable of withstanding the rotational biasing force acting on the winding roll 3, and its material and shape must also be considered.

[0031] It should be noted that this locking member 6 need only be capable of engaging with the winding roll 3 and the support portion 4 to temporarily stop the rotation of the winding roll 3, and may be provided as an accessory or assembled as an integral part. For example, an integrally assembled locking member may be a rod or other such member assembled to one of the support portion 4 or the winding roll 3, which engages with the other by pressing a button provided on the support portion 4 or the winding roll 3, thereby stopping the rotation of the winding roll 3.

[0032] Furthermore, the support part 4 is provided with a notch 13 corresponding to the engaged part 11 at a position extending longitudinally from the engaged part 11 of the winding roll 3. Therefore, when the winding roll 3 is attached or detached, the engaged part 11 does not come into contact with the support part 4 and is guided therethrough, which is further advantageous in the screen sheet replacement work.

[0033] A method for replacing the screen sheet 2 in the projection screen unit 1 according to the embodiment of the present invention will be described below with reference to FIGS.

[0034] As described above, the projection screen device 1 used in this screen sheet replacement method comprises a screen sheet 2 having a screen surface on the front side, a take-up roll 3 connected to the base end side of the screen sheet 2 and winding up the screen sheet 2, a support part 4 that rotatably supports the take-up roll 3, and a rotational biasing member that rotates the take-up roll 3 using the biasing force of the rotational biasing member to rotate the take-up roll 3 around its axis, thereby winding up the screen sheet 2.A locking member 6 is provided that can engage with the take-up roll 3 and the support part 4 to temporarily stop the rotation of the take-up roll 3, and the screen sheet 2 is detachable from the take-up roll 3.

[0035] In addition, as shown in Figure 6, the replacement screen sheet 14 is wound around the cylindrical winding core 15 with the end bar 5 housed inside, so that storage, transportation, and replacement can be done in a space-saving manner.

[0036] To replace the screen sheet 2 of the projection screen device 1, first, the screen sheet 2 attached to the projection screen device 1 is completely pulled out to expose the connection portion between the screen sheet 2 and the winding roll 3. Next, in this state, the locking member 6 is inserted into the first hole 8 and the second hole 9 to temporarily stop the rotation of the winding roll 3. Next, the engaging portion 10 of the screen sheet 2 is moved in the longitudinal direction of the winding roll 3 relative to the winding roll 3, while the engaging portion 10 is pulled out from the engaged portion 11, thereby removing the screen sheet 2 from the winding roll 3.

[0037] Next, a new replacement screen sheet 14 is attached to the winding roll 3. The replacement screen sheet 14 is wound around the cylindrical winding core 15, and from this state, as shown in Figure 7, the engaging portion 10 of the replacement screen sheet is pulled out slightly and this engaging portion 10 is inserted into the longitudinal end of the engaged portion 11 of the winding roll 3, thereby attaching the replacement screen sheet 14 to the winding roll 3. Thereafter, the locking member 6 is removed, and the entire replacement screen sheet 14 is unwound from the cylindrical winding core 15, and the replacement screen sheet 14 is wound around the winding roll 3 in accordance with the rotation of the winding roll 3, whereby the replacement screen sheet 14 is wound around the winding roll 3, and replacement of the screen sheet 2 is completed.

[0038] Normally, when the screen sheet 2 is fully pulled out, a strong rotational force acts on the winding roll 3, making it difficult to replace the screen sheet 2. However, in this projection screen device 1, the rotation of the winding roll 3 can be temporarily stopped by the locking member 6 in this state, and during this time the screen sheet can be replaced with a replacement screen sheet 14 wound around the cylindrical winding core 15, making the replacement work easier.

[0039] The cylindrical winding core 15 is a cylindrical member made of paper with a slit formed in the longitudinal direction, and this shape allows the screen sheet 2 to be wound around it, while also allowing accessories such as fixing hooks 5a and level 5b provided at the tip of the screen sheet 2 to be stored inside and wound around it to protect them. However, the configuration is not limited to this, and for example, it may be short enough to store only the accessories, and the cross-sectional shape may be any shape that allows the screen sheet 2 to be wound around it, and it may be configured to fit other jigs or devices.

[0040] The present invention is not limited to the above-described embodiment and can be widely used in other screen devices. As another example, another embodiment is shown in FIGS.

[0041] As shown in Figure 8, another embodiment 1A is a projection screen device to be installed on a wall or ceiling, in which a first hole 8A is provided in the support part 4A and a second hole 9A is provided in the winding roll 3A, and a locking member 6A is attached, and the replacement of the screen sheet 2 has the same effect as the above embodiment 1.

[0042] Furthermore, as shown in FIG. 9, yet another embodiment 1B is a projection screen device that can stand on its own on the floor with the screen pulled out, in which a first hole 8B is provided in the support portion 4B and a second hole 9B is provided in the winding roll 3B, and a locking member 6B is attached, and the replacement of the screen sheet 2 has the same effect as in the above embodiment 1. [Explanation of symbols]

[0043] 1, 1A, 1B Projection screen equipment 2 Screen Sheet 2a Screen surface 3, 3A, 3B Winding roll 4,4A,4B Support part 5,5A,5B End Bars 5a hook 5b Level 6, 6A, 6B Locking members 6a Retaining part 7 Shaft member 8 Replacement Screen Sheets 8,8A,8B First hole 9,9A,9B 2nd hole 10 Engagement portion 11 Engaged part 12 recess 13 Notch 14 Replacement Screen Sheets 15 Cylindrical winding core

Claims

1. A screen sheet having a screen surface on the front side; A winding roll connected to a base end side of the screen sheet and winding up the screen sheet; A support portion that rotatably supports the winding roll; a rotation biasing member that biases the winding roll to rotate; a projection screen device in which the winding roll is rotated around an axis of the winding roll by the biasing force of the rotation biasing member to wind up the screen sheet, a first hole is provided in the support portion, and a second hole is provided in the winding roll at a position corresponding to the first hole when the screen sheet is in the replacement position; and a locking member is provided that can be inserted through the first hole and the second hole to engage the winding roll and the support portion and temporarily stop rotation of the winding roll; A projection screen device characterized in that the screen sheet is detachable from the winding roll, and the screen sheet is replaceable with a replacement screen sheet wound around a cylindrical winding core while the rotation of the winding roll is temporarily stopped by the locking member.

2. 2. The projection screen apparatus according to claim 1, wherein the locking member stops the rotation of the winding roll when the screen sheet is completely pulled out and the connecting portion between the screen sheet and the winding roll is exposed.

3. 3. The projection screen device according to claim 1 or 2, wherein an engagement portion for engaging with the winding roll is provided on the base end side of the screen sheet, and an axially extending recess and an engaged portion with which the engagement portion engages within the recess are provided on the outer circumferential surface of the winding roll.

4. 4. The projection screen apparatus according to claim 3, wherein said support portion is provided with a notch at a position corresponding to said engaged portion of said winding roll, the notch being located at a position extending in the longitudinal direction of said support portion.

5. 5. The projection screen apparatus according to claim 1, wherein the cylindrical core accommodates at least a part of the free end of the replacement screen sheet therein.

6. A screen sheet having a screen surface on the front side; A winding roll connected to a base end side of the screen sheet and winding up the screen sheet; A support portion that rotatably supports the winding roll; a rotation biasing member that biases the winding roll to rotate; a projection screen device in which the winding roll is rotated around an axis of the winding roll by the biasing force of the rotation biasing member to wind up the screen sheet, a first hole is provided in the support portion, and a second hole is provided in the winding roll at a position corresponding to the first hole when the screen sheet is in the replacement position; and a locking member is provided that can be inserted through the first hole and the second hole to engage the winding roll and the support portion and temporarily stop rotation of the winding roll; The screen sheet of a projection screen device, in which the screen sheet is detachable from the winding roll, The method for replacing the screen sheet of a projection screen device includes replacing the screen sheet with a replacement screen sheet wound around a cylindrical winding core while the rotation of the winding roll is temporarily stopped by the locking member.

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