Shielding device

Abstract

To provide a shielding device with good aesthetic appearance, which allows two shielding materials to be opened and closed individually, and also allows operation members to be kept compact when not in operation.SOLUTION: A shielding device includes a switching mechanism 180 that can switch transmission of the rotation of a pulley 150 to either a first winding pipe 130 or a second winding pipe 140, and a drive gear mechanism 200 that can transmit the rotation of the pulley to the first winding pipe and the second winding pipe. The drive gear mechanism includes an input gear 202 that is provided for rotation in unison with the pulley, a first relay gear 204 that is provided for movement between a first position where the rotation of the input gear can be transmitted to the first winding pipe and a second position where the rotation can be transmitted to the second winding pipe by switching operation of the switching mechanism, a first drive gear 206 to which the rotation is transmitted when the first relay gear 204 is moved to the first position, and a second drive gear 210 to which the rotation is transmitted when the first relay gear is moved to the second position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a shielding device. [Background technology]

[0002] A conventional shading device is disclosed in Japanese Patent No. 6184883 (Patent Document 1). The shading device disclosed in this document is configured so that when the front side of the operating chain is pulled down, the first take-up pipe rotates in a direction that lowers the first screen, and when the front side of the operating chain is pulled down a predetermined amount and then released, the first take-up pipe rotates in a direction that raises the first screen. Also, when the rear side of the operating chain is pulled down, the second take-up pipe rotates in a direction that lowers the second screen, and when the rear side of the operating chain is pulled down a predetermined amount and then released, the second take-up pipe rotates in a direction that raises the second screen.

[0003] This type of shading device allows the two screens to be raised and lowered individually by operating the operating chain, making it easy to block out light or adjust the amount of light by selecting the material for each screen. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6184883 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional shading device disclosed in Patent Document 1, it is necessary to ensure that the operating amount of the operating chain corresponds to the amount of lifting and lowering of the screen. This results in a configuration in which the operating chain, which has a certain length, hangs down endlessly, which causes a problem of impairing the design.

[0006] The present invention was made in consideration of these problems, and its purpose is to provide a shading device with good design that allows two shading materials to be opened and closed individually, while keeping the operating members compact when not in use. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, according to the present invention, there is provided a shielding device including a first shielding material and a second shielding material, a first rotating shaft body that opens and closes the first shielding material, and a second rotating shaft body that opens and closes the second shielding material, the shielding device including: a pulley that rotates and drives the first rotating shaft body and the second rotating shaft body; an operating member that is connected at one end to the pulley and can be operated by pulling to rotate the pulley in one direction; a biasing member that biases the pulley in the other direction; a switching mechanism that can switch the transmission of the rotation of the pulley to either the first rotating shaft body or the second rotating shaft body; a drive gear mechanism including an input gear rotatable integrally with the pulley, a first relay gear movable between a first position where the rotation of the input gear can be transmitted to the first rotating shaft and a second position where the rotation of the input gear can be transmitted to the second rotating shaft by a switching operation of the switching mechanism, a first drive gear to which the rotation of the first relay gear is transmitted when the first relay gear is moved to the first position, and a second drive gear to which the rotation of the first relay gear is transmitted when the first relay gear is moved to the second position.

[0008] According to this configuration, by switching the shielding material to be operated using the switching mechanism, two shielding materials can be opened and closed individually even when the operation method is simply to pull the operating member. Furthermore, when not in use, the operating member can be wound around the pulley to keep it compact, improving the design. Another advantage is that it can prevent people or pets from getting caught in the operating member.

[0009] The present invention can be applied in various ways. For example, the present invention may include a first clutch device provided between the first drive gear and the first rotating shaft body, which transmits or stops the rotation of the first drive gear to the first rotating shaft body depending on the rotation direction of the first drive gear, and a second clutch device provided between the second drive gear and the second rotating shaft body, which transmits or stops the rotation of the second drive gear to the second rotating shaft body depending on the rotation direction of the second drive gear. With this configuration, the first rotating shaft body and the second rotating shaft body can be easily switched between rotating and stopping.

[0010] Furthermore, the first relay gear may be provided so as to be movable between the first position and the second position along an orthogonal direction perpendicular to the axial direction. With this configuration, the first relay gear that moves to switch the shielding material to be operated moves along the orthogonal direction perpendicular to the axial direction, so that the axial size of the switching mechanism can be reduced.

[0011] The switching mechanism may include a switching operation unit that is rotated by an operator, a movable member that receives rotation of the switching operation unit and is provided so as to be linearly movable in a forward and backward direction in accordance with the rotation direction of the switching operation unit, and a swinging member that has a support shaft that rotatably supports the first relay gear and converts the linear motion of the movable member into swinging motion along the orthogonal direction, and the position of the first relay gear may be switched between the first position and the second position in accordance with the swinging direction of the swinging member. With this configuration, the first relay gear that moves to switch the shielding material to be operated moves along the orthogonal direction that is orthogonal to the axial direction, thereby making it possible to reduce the axial size of the switching mechanism.

[0012] Furthermore, the swing member may have an opening through which the input gear can be inserted, and may swing about an axis of the input gear inserted into the opening. With this configuration, the fitting dimensions of the parts in a direction perpendicular to the axial direction can be reduced, and the size of the switching mechanism can be reduced not only in the axial direction but also in the perpendicular direction.

[0013] Furthermore, the shielding device may further include a second relay gear provided between the first relay gear and the first drive gear, or between the first relay gear and the second drive gear. With this configuration, the rotation direction of the first drive gear and the rotation direction of the second drive gear can be made different from each other, which makes it possible to flexibly design the arrangement of the first rotating shaft body and the second rotating shaft body according to the type and specifications of the shielding device.

[0014] Furthermore, the first shielding material and the second shielding material may each be a screen, and the first rotating shaft body and the second rotating shaft body may be arranged so that their axial center positions are different from each other in the front-to-back and up-to-down directions, and may be winding pipes that can wind up and unwind the first shielding material and the second shielding material, respectively. This configuration can be suitably applied to a roll screen with specifications in which two screens are arranged in front and behind each other. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a shading device with good design, in which two shading members can be opened and closed individually, while the operating members can be kept compact when not in operation. Other effects of the present invention will be described in the detailed description of the invention below. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a roller blind 100 according to an embodiment of the present invention. [Figure 2] FIG. 1 is a side view of the roller blind 100 with the operation unit 190 removed. [Figure 3] FIG. 2 is a cross-sectional view of the operation unit 190. [Figure 4] FIG. 10 is a perspective view of the switching mechanism 180 as seen from below. [Figure 5] 1A and 1B are perspective views of a switching mechanism 180 and an operation unit case 191, where (a) is an exploded view and (b) is an assembled view. [Figure 6]10A and 10B are bottom views showing the operation of the switching mechanism 180, where (a) is the first position and (b) is the second position. [Figure 7] FIG. 2 is a perspective view of a drive gear mechanism 200. [Figure 8] 1A and 1B are perspective views of a pulley 150, a switching mechanism 180, an input gear 202, and a first relay gear 204, where (a) is an exploded view and (b) is an assembled view. [Figure 9] FIG. 2 is a perspective view of a switching mechanism 180 and a drive gear mechanism 200. [Figure 10] 10A and 10B are side views showing the operation of the switching mechanism 180, in which (a) shows the state when inputting to the first drive gear 206, and (b) shows the state when inputting to the second drive gear 210. FIG. [Figure 11] 10A and 10B are diagrams for explaining the first clutch device 220, in which (a) is an exploded oblique view, (b) is a cross-sectional view showing a state in which the rotation of the operation unit 190 is not transmitted to the first winding pipe 130, and (c) is a cross-sectional view showing a state in which the rotation of the operation unit 190 is transmitted to the first winding pipe 130. [Figure 12] 2 is a perspective view of an operation unit 190, a first clutch device 220, and a second clutch device 230. FIG. [Figure 13] 10A and 10B are side views showing the state of transmission of driving force, in which (a) shows the state when input to the first driving gear 206, and (b) shows the state when input to the second driving gear 210. FIG. [Figure 14] This is a diagram showing the raising and lowering operation of the roller blind 100, where (a) shows the first screen 110 at its upper limit and the second screen 120 at its upper limit, and (b) shows the first screen 110 in a lowering operation and the second screen 120 at its upper limit. [Figure 15] This is a diagram showing the raising and lowering operation of the roller blind 100, where (a) shows the first screen 110: operating cord winding and the second screen 120: at the upper limit, and (b) shows the first screen 110: lowering operation and the second screen 120: at the upper limit. [Figure 16]This is a diagram showing the raising and lowering operation of the roller blind 100, where (a) shows the state where the first screen 110 is stopped at the lower limit and the second screen 120 is at the upper limit, and (b) shows the state where the switching mechanism 180 is switched when the first screen 110 is stopped at the lower limit and the second screen 120 is at the upper limit. [Figure 17] This is a diagram showing the raising and lowering operation of the roller blind 100, where (a) shows the first screen 110 stopped at the lower limit and the second screen 120 moving downward, and (b) shows the first screen 110 stopped at the lower limit and the second screen 120 winding up the operating cord. [Figure 18] This is a diagram showing the raising and lowering operation of the roller blind 100, where (a) shows the first screen 110 stopped at the lower limit and the second screen 120 moving downward, and (b) shows the first screen 110 stopped at the lower limit and the second screen 120 stopped at the lower limit. DETAILED DESCRIPTION OF THE INVENTION

[0017] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant description will be omitted. While the following embodiments will be described using a roller blind as an example, the present invention can also be applied to blinds such as pleated blinds, honeycomb screens, and Roman shades.

[0018] An embodiment of the present invention will be described below. In this embodiment, the surface facing the room when the roller blind is installed will be referred to as the front, the surface facing the room outside as the back, and the direction consisting of the front and back as the front-to-rear direction. First, the configuration of a roller blind 100 (shading device) will be described with reference to Figs. 1 to 3. Fig. 1 is a perspective view of the roller blind 100 of this embodiment. Fig. 2 is a side view of the roller blind 100 showing the state in which the operation unit 190 has been removed. Fig. 3 is a cross-sectional view of the operation unit 190.

[0019] As shown in Figures 1 to 3, the roller blind 100 comprises a first screen 110 (first shielding material), a second screen 120 (second shielding material), a first winding pipe 130 (first rotating shaft) that opens and closes the first screen 110, and a second winding pipe 140 (second rotating shaft) that opens and closes the second screen 120. Furthermore, the roller blind 100 includes a pulley 150 that rotates the first winding pipe 130 and the second winding pipe 140, an operation cord 160 (operating member) that is connected at one end to the pulley 150 and can be operated by pulling to rotate the pulley 150 in one direction, a spiral spring 170 (urging member) that urges the pulley 150 in the other direction, a switching mechanism 180 that can switch the transmission of the rotation of the pulley 150 to either the first winding pipe 130 or the second winding pipe 140, and a drive gear mechanism 200 (see FIG. 7 etc. described later) that can transmit the rotation of the pulley 150 to the first winding pipe 130 and the second winding pipe 140. The configuration of each part of the roller blind 100 will be described below.

[0020] As shown in Figures 1 and 2, the roller blind 100 has a first winding pipe 130 and a second winding pipe 140 arranged in the vertical direction within a set frame 102, which is fixed to a fixed surface such as a window frame by brackets 101. An operation unit 190 is provided at one longitudinal end of the set frame 102, and a side plate 103 is provided at the other end. The operation unit 190 supports one ends of the first winding pipe 130 and the second winding pipe 140 so as to transmit a driving force. The side plate 103 also supports the other ends of the first winding pipe 130 and the second winding pipe 140 so as to be rotatable. The first winding pipe 130 is disposed forward of the second winding pipe 140.

[0021] 2, the upper end of the first screen 110 is connected to the first winding pipe 130 so as to be able to be wound and unwound, and the upper end of the second screen 120 is connected to the second winding pipe 140 so as to be able to be wound and unwound. Therefore, the first screen 110 is disposed in front of the second screen 120. The first screen 110 is wound in a direction that hangs down from the front side of the first winding pipe 130, and the second screen 120 is wound in a direction that hangs down from the rear side of the second winding pipe 140. In this way, the first winding pipe 130 and the second winding pipe 140 rotate in opposite directions when winding up the screens.

[0022] 3, the operation unit 190 is configured to include a pulley 150 that rotates the first take-up pipe 130 and the second take-up pipe, an operation cord 160 that is connected at one end to the pulley 150 and can be operated to rotate the pulley 150 in one direction by pulling, a spiral spring 170 that urges the pulley 150 in the other direction, a switching mechanism 180 that can switch the transmission of the rotation of the pulley 150 to either the first take-up pipe 130 or the second take-up pipe 140, and a drive gear mechanism 200. Each of these components is assembled into an operation unit case 191 of the operation unit 190 and housed in a cover 196.

[0023] (pulley 150) As shown in Fig. 3, the pulley 150 is rotatably supported by a pulley rotation support part 151 disposed at the center of an operation unit case 191 that constitutes the outer shell of the operation unit 190. The pulley 150 is connected to an input part 202a of a drive gear mechanism 200 (described later) so as to rotate integrally therewith (see Fig. 8). When an operation cord 160 wound around the outer periphery of the pulley 150 is pulled downward, the pulley 150 rotates in one direction, and the operation cord 160 is unwound. The pulley 150 is also rotated in the other direction by a power spring 170 housed inside, and the operation cord 160 is wound around the pulley 150. The pulley 150 is provided with engagement protrusions 152 at three positions in the circumferential direction, which are inserted into and engage with insertion holes 202b of an input gear 202 (described later) (see Fig. 8).

[0024] (Operation code 160) 3, one end of the operation cord 160 is connected to the pulley 150, and is wound around the pulley 150 so that the pulley 150 is rotated in one direction by pulling the cord. The other end of the operation cord 160 is passed through a cord guide 192 provided below the pulley 150 of the operation unit case 191, and then passed through a switching rod 181 (described later) to be connected to a cord stopper 161 below the switching rod 181, as shown in FIG.

[0025] (Mainspring 170) As shown in Fig. 3, the power spring 170 is housed inside the pulley 150. One end of the power spring 170 is engaged with the outer periphery of the pulley 150, and the other end of the power spring 170 is engaged with the pulley rotation support portion 151. The power spring 170 biases the pulley 150 in the other direction, i.e., in the direction in which the pulley 150 winds the operating cord 160. The power spring 170 may be configured to constantly bias the pulley 150 in the other direction, or may be configured to lose its biasing force when the pulley 150 has wound up a desired amount of the operating cord 160 (for example, when the entire cord has been wound up).

[0026] (Switching mechanism 180) The switching mechanism 180 is capable of switching the transmission of rotation of the pulley 150 to either the first take-up pipe 130 or the second take-up pipe 140. The configuration of the switching mechanism 180 will be described with reference to Figures 4 and 5 in addition to Figures 1 to 3. Figure 4 is a perspective view of the switching mechanism 180 as seen from below.

[0027] As shown in Figures 4 and 5, the switching mechanism 180 is configured to include a switching rod 181 (switching operation unit) that is rotated by an operator, a slider 182 (movable member) that receives the rotation of the switching rod 181 and is capable of linear movement in the forward and backward directions depending on the direction of rotation of the switching rod 181, and a swing lever 184 (swing member) that has a support shaft 183 that rotatably supports the first relay gear 204 (see Figure 8) and converts the linear movement of the slider 182 into swing movement along the perpendicular direction.

[0028] (Switching rod 181) The switching rod 181 is a part that is rotated by an operator. As shown in FIG. 1, the switching rod 181 is led downward from the operation unit 190. As shown in FIG. 4, the switching rod 181 is cylindrical. A switching input unit 185 that switches the rotation of the switching rod 181 to the movement of the slider 182 is provided at the top of the switching rod 181. The switching input unit 185 is fan-shaped, and moves the slider 182 by pressing a protruding portion 182a of the slider 182, which will be described later, at its tip. The switching input unit 185 is also hollow, as shown in FIG. 3, and the operation cord 160 is inserted through the switching input unit 185 and the switching rod 181.

[0029] (Slider 182) The slider 182 transmits the rotation of the switching rod 181 to the swing lever 184. As shown in Fig. 4, the slider 182 is a long rectangle, and has a protruding portion 182a that protrudes downward from the center in the longitudinal direction. In addition, the slider 182 has a connecting piece 182b that protrudes upward and supports the swing lever 184 at its tip, closer to the front than the center in the longitudinal direction.

[0030] (Support shaft 183) The support shaft 183 rotatably supports a first relay gear 204, which will be described later. As shown in Fig. 4, the support shaft 183 is provided on the swing lever 184 so as to protrude in the axial direction. The support shaft 183 is formed in a cylindrical shape, and passes through a through-hole 204a of the first relay gear 204, which will be described later, to rotatably support it (see Fig. 8).

[0031] (Swing lever 184) The swing lever 184 switches the position of the first relay gear 204 between a first position and a second position. As shown in FIG. 4, the swing lever 184 is configured in a roughly teardrop shape (the shape of a falling teardrop), and has an opening 184a in the center through which the input gear 202, which will be described later, can be inserted. The swing lever 184 swings around the axis of the input gear 202 inserted into the opening 184a. The swing lever 184 has an upper protruding portion on the front side, and a support shaft 183 is provided thereon. The lower portion of the swing lever 184 is swingably connected to the connecting piece 182b.

[0032] The above has described the configuration of each part of the switching mechanism 180. Below, the attachment of the switching mechanism 180 to the operation unit case 191 will be described with reference to Fig. 5. Fig. 5 is a perspective view of the switching mechanism 180 and the operation unit case 191, where (a) is an exploded view and (b) is an assembled view.

[0033] 5, the operation unit case 191 is formed with a slide support portion 191a that houses the slider 182 and supports it so that it can move linearly in the front-to-rear direction. A swing support portion 191b that fits into the inside of the opening 184a of the swing lever 184 and supports it so that it can swing is formed above the slide support portion 191a and protrudes in the axial direction. In addition, a support shaft insertion hole 191c through which the support shaft 183 is movably inserted is formed in the rear side of the swing support portion 191b as an elongated circular arc hole. A rotation support portion 191d that houses the switching input portion 185 and rotatably supports it is formed below the slide support portion 191a.

[0034] As shown in FIG. 5( b), the switching mechanism 180 is assembled to the operation unit case 191 from the longitudinal end side of the set frame 102. First, the slider 182 is accommodated in the slide support portion 191 a, and the opening 184 a of the swing lever 184 is fitted into the swing support portion 191 b, and the support shaft 183 is inserted into the support shaft insertion hole 191 c. Then, the input gear 202 is inserted into the opening 184 a. Thus, with the operation unit case 191 sandwiched between them, the input gear 202 is disposed on the longitudinal center side of the set frame 102, and the input portion 202 a is disposed on the end side. Next, the switching input portion 185 is rotatably accommodated in the rotation support portion 191 d so that the switching rod 181 hangs down from the operation unit case 191. In this manner, the switching mechanism 180 is assembled to the operation unit case 191.

[0035] The attachment of the switching mechanism 180 to the operation unit case 191 has been described above. The operation of the switching mechanism 180 will now be described with reference to FIG. 6. FIG. 6 is a bottom view showing the operation of the switching mechanism 180, with (a) being the first position and (b) being the second position. The switching mechanism 180, through a switching operation, moves the first relay gear 204 between the first position where the rotation of the input gear 202 can be transmitted to the first take-up pipe 130 and the second position where the rotation of the input gear 202 can be transmitted to the second take-up pipe 140. The operation of the switching mechanism 180 will now be described in detail.

[0036] 6(a), when the switching rod 181 of the switching mechanism 180 is rotated counterclockwise as indicated by arrow A in the figure, one end of the switching input portion 185 comes into contact with the front side of the protruding portion 182a and presses the protruding portion 182a from the front. This causes the slider 182 to move rearward as indicated by arrow B in the figure, and the swing lever 184 swings so that the support shaft 183 moves upward. Therefore, the first relay gear 204 moves to a first position where the rotation of the input gear 202 can be transmitted to the first take-up pipe 130.

[0037] 6(b), when the switching rod 181 of the switching mechanism 180 is rotated clockwise as indicated by the arrow C in the figure, the other end of the switching input portion 185 comes into contact with the rear side of the protruding portion 182a and presses the protruding portion 182a from the rear side. This causes the slider 182 to move forward as indicated by the arrow D in the figure, and the swing lever 184 swings so that the support shaft 183 moves downward. Therefore, the first relay gear 204 moves to a second position where the rotation of the input gear 202 can be transmitted to the second take-up pipe 140.

[0038] (Drive gear mechanism 200) The drive gear mechanism 200 transmits the rotation of the pulley 150 to the first take up pipe 130 or the second take up pipe 140. The drive gear mechanism 200 will be described with reference to Fig. 7. Fig. 7 is a perspective view of the drive gear mechanism 200.

[0039] 7, the drive gear mechanism 200 is configured to include an input gear 202 that is provided so as to be rotatable integrally with the pulley 150, a first relay gear 204 that is provided so as to be movable between a first position where the rotation of the input gear 202 can be transmitted to the first take-up pipe 130 and a second position where the rotation of the input gear 202 can be transmitted to the second take-up pipe 140 by a switching operation using the switching mechanism 180, a first drive gear 206 to which the rotation of the first relay gear 204 is transmitted when the first relay gear 204 is moved to the first position, and a second drive gear 210 to which the rotation of the first relay gear 204 is transmitted when the first relay gear 204 is moved to the second position. The gears are arranged to mesh with each other in the front-to-rear and up-down directions.

[0040] The input gear 202 is provided so as to be rotatable integrally with the pulley 150. As shown in Fig. 7, the input gear 202 is provided so that an input portion 202a, which is a disk-shaped input portion having a larger diameter than the input gear 202, rotates coaxially with the input gear 202. The input portion 202a has insertion holes 202b formed at three locations in the circumferential direction. The insertion holes 202b engage with the engagement protrusions 152 of the pulley 150, and the input gear 202 and the pulley 150 rotate integrally.

[0041] The first relay gear 204 switches the transmission of the rotation of the input gear 202 between the first take-up pipe 130 and the second take-up pipe 140. As shown in FIG. 7 , the first relay gear 204 has a through-hole 204a formed at its axis that penetrates in the axial direction. The through-hole 204a is rotatably supported by the support shaft 183 of the switching mechanism 180. As shown in FIG. 7 , the first relay gear 204 is disposed rearward of the input gear 202 and meshes with the input gear 202. By switching operation using the switching mechanism 180, the first relay gear 204 can move between a first position where the rotation of the input gear 202 can be transmitted to the first take-up pipe 130 and a second position where the rotation of the input gear 202 can be transmitted to the second take-up pipe 140. The first relay gear 204 meshes with the second relay gear 208 in the first position and meshes with the second drive gear 210 in the second position.

[0042] The first drive gear 206 transmits rotation to the first winding pipe 130. As shown in FIG. 7, the first drive gear 206 is disposed above the input gear 202. The first drive gear 206 has three arc-shaped first elongated through holes 206a formed in the axial direction at three locations in the circumferential direction. A first engagement protrusion 207a of a first transmission member 207 that transmits the rotation of the first drive gear 206 to a first clutch device 220 (described later) is inserted into the first elongated through holes 206a. Note that if a configuration is achieved in which relative rotation between the first drive gear 206 and the first transmission member 207 is not required, the first engagement protrusion may be directly provided on the first drive gear. The same applies to the second drive gear 210.

[0043] The second relay gear 208 is intended to reverse the rotation directions of the first take-up pipe 130 and the second take-up pipe 140. As shown in Fig. 7, the second relay gear 208 is disposed between the first relay gear 204 and the first drive gear 206 so as to mesh with the diagonally upper rear portion of the first relay gear 204 and the diagonally lower rear portion of the first drive gear 206. In addition, as will be described later, the second relay gear 208 has a shaft portion 208a that protrudes from the shaft center and is disposed in the guide hole 191e of the operation unit case 191 so as to be movable along the guide hole 191e (see Fig. 10).

[0044] The second drive gear 210 transmits rotation to the second winding pipe 140. As shown in FIG. 7, the second drive gear 210 is disposed below the input gear 202 and rearward of the first drive gear 206. The second drive gear 210 is formed with arc-shaped second elongated through holes 210a at three locations in the circumferential direction, penetrating the gear in the axial direction. Second engagement protrusions 211a of a second transmission member 211, which transmits rotation of the second drive gear 210 to a second clutch device 230 (described later), are inserted into the second elongated through holes 210a.

[0045] The configuration of each part of the drive gear mechanism 200 has been described above. Below, the assembly of the pulley 150, the switching mechanism 180, and the drive gear mechanism 200 will be described with reference to Figs. 8 to 10. Fig. 8 is a perspective view of the pulley 150, the switching mechanism 180, the input gear 202, and the first relay gear 204. Fig. 9 is a perspective view of the switching mechanism 180 and the drive gear mechanism 200. Fig. 10 is a side view showing the operation of the switching mechanism 180.

[0046] 8 and 9, the pulley 150 is assembled to the input portion 202a by inserting and engaging the engagement protrusion 152 into the insertion hole 202b. The support shaft 183 passes through the through hole 204a of the first relay gear 204 to rotatably support the first relay gear 204. The input gear 202 passes through the opening 184a of the swing lever 184, and as shown in FIG. 9, the input gear 202 is disposed on the opposite side of the pulley 150 via the switching mechanism 180.

[0047] 9, the first engaging projection 207a of the first transmission member 207 is inserted into the first elongated through hole 206a of the first drive gear 206, and the second engaging projection 211a of the second transmission member 211 is inserted into the second elongated through hole 210a of the second drive gear 210. The gears that make up the drive gear mechanism 200 are connected as described above.

[0048] 10, the second relay gear 208 has a shaft portion 208a inserted therethrough so as to be movable along a guide hole 191e that is formed in the operation unit case 191 and that slopes rearward as it extends upward. Therefore, the position of the second relay gear 208 can be changed in accordance with the swing width and tooth position of the first relay gear 204, and the second relay gear 208 can reliably mesh with the first relay gear 204.

[0049] When the switching rod 181 of the switching mechanism 180 is rotated in one direction and the slider 182 is moved rearward via the switching input portion 185 as shown in FIG. 10(a), the first relay gear 204 moves to the first position. That is, the first relay gear 204 swings upward and meshes with the second relay gear 208. Therefore, the rotation of the pulley 150 is transmitted to the first drive gear 206.

[0050] 10(b), when the switching rod 181 of the switching mechanism 180 is rotated in the other direction and the slider 182 is moved forward via the switching input portion 185, the first relay gear 204 moves to the second position. That is, the first relay gear 204 swings downward and meshes with the second drive gear 210. Therefore, the rotation of the pulley 150 is transmitted to the second drive gear 210.

[0051] The configuration of the operation unit 190 has been described above. The first clutch device 220 and second clutch device 230 further provided in the roller blind 100 will now be described with reference to Figs. 11 and 12. Fig. 11 is a diagram for explaining the first clutch device 220. Fig. 12 is a perspective view of the operation unit 190 and the first and second clutch devices 220, 230.

[0052] The first clutch device 220 is provided between the first drive gear 206 and the first take-up pipe 130, and transmits or does not transmit the rotation of the first drive gear 206 to the first take-up pipe 130 depending on the rotation direction of the first drive gear 206. The second clutch device 230 transmits or does not transmit the rotation of the second drive gear 210 to the second take-up pipe 140 depending on the rotation direction of the second drive gear 210. The first clutch device 220 and the second clutch device 230 have the same basic configuration except that the clutches operate in opposite directions, so the configuration of the clutch devices will be explained using the first clutch device 220 as an example.

[0053] The configuration of the first clutch device 220 will be described with reference to Fig. 11. As shown in Fig. 11, the first clutch device 220 is configured to include a shaft 221 that is non-rotatably supported by a first bearing portion 194 of the operation unit 190, which will be described later, a cam drive 222 that is rotatably supported by the shaft 221 and rotates integrally with the first transmission member 207, a clutch spring 223 that fastens and loosens relative to the shaft 221, three guide pins 224, and a guide washer 225 that guides the three guide pins 224, thereby enabling movement between a transmission position in which the rotation of the operation unit 190 is transmitted to the first take-up pipe 130 and a non-transmission position in which transmission is disabled.

[0054] As shown in Figure 11(a), the cam drive 222 is configured in a doughnut-shaped disk shape, with three cam drive insertion holes 222a formed at equal intervals in the circumferential direction. As shown in Figure 11(b), one surface of the cam drive 222 is formed with cam surfaces 222b that guide the movement of each of the three guide pins 224, and engagement surfaces 222c that are located across the cam drive insertion holes 222a and face the respective cam surfaces 222b.

[0055] As shown in FIG. 11(a), the clutch spring 223 has a coil shape, and both ends 223a and 223b of the clutch spring 223 protrude radially outward at positions spaced 180 degrees apart in the circumferential direction.

[0056] As shown in FIG. 11(a), three guide pins 224 are provided, each having a cylindrical shape.

[0057] As shown in Fig. 11(a), the guide washer 225 is configured in a doughnut-shaped disk shape, with a pair of protrusions 225a, 225b formed to protrude in the axial direction from one surface. As shown in Fig. 11(b), the pair of protrusions 225a, 225b are provided at three equally spaced locations along the outer periphery, with one protrusion 225a having a substantially rectangular cross section and the other protrusion 225b having a trapezoidal cross section. Furthermore, two first and second pressing portions 225c, 225d protruding in the axial direction are formed on one surface of the center-side edge of the guide washer 225, and the positions of these first and second pressing portions 225c, 225d are offset from each other by a predetermined angle in the circumferential direction from 180 degrees.

[0058] 11(a), the first clutch device 220 includes a case 226 to which a cam drive 222, a clutch spring 223, a guide pin 224, and a guide washer 225 are assembled. Nine engaging portions 226a are formed on the inner peripheral surface of one end of the case 226, protruding toward the center at equal intervals in the circumferential direction, and the cam drive 222, the clutch spring 223, the guide pin 224, and the guide washer 225 are arranged in a space defined by connecting the tips of the nine engaging portions 226a.

[0059] 11(b) and (c), the components configured as described above are such that the cam drive 222 abuts against the side surface at the end of the case 226, the pair of protrusions 225a and 225b are disposed inside the case 226, and the guide washer 225 is disposed at the innermost part of the case 226. Then, the clutch spring 223 and the three guide pins 224 are disposed between the cam drive 222 and the guide washer 225.

[0060] The shaft 221 is inserted through the center of the cam drive 222, and the cam drive 222 is thereby rotatably supported by the shaft 221.

[0061] The three first engagement protrusions 207a of the first transmission member 207 are inserted into the three cam drive insertion holes 222a of the cam drive 222. As a result, the three first engagement protrusions 207a engage with the back surface of the cam surface 222b, and the first transmission member 207 and the cam drive 222 rotate together.

[0062] The shaft 221 is inserted through the center of the guide washer 225. As a result, the guide washer 225 is rotatably supported by the shaft 221. The guide washer 225 and the cam drive 222 are rotatable relative to each other, but when the protrusion 225b of the guide washer 225 and the engagement surface 222c of the cam drive 222 come into contact with each other, the relative rotation is restricted.

[0063] Coil-shaped clutch spring 223 has shaft 221 inserted through its center and is supported so as to be fastened and loosened by shaft 221. Clutch spring 223 is disposed between shaft 221 and cam drive 222, and two spaces are defined by both ends of clutch spring 223 and cam drive 222. Pressing portion 222d of cam drive 222 and first pressing portion 225c of guide washer 225 are disposed in one of these two spaces, and second pressing portion 225d of guide washer 225 is disposed in the other space.

[0064] The pressing portion 222d of the cam drive 222 is capable of pressing an end portion of the clutch spring 223, and the first and second pressing portions 225c and 225d of the guide washer 225 are capable of pressing an end portion of the clutch spring 223. The pressing portion 222d of the cam drive 222 and the first pressing portion 225c of the guide washer 225 press the ends 223a and 223b of the clutch spring 223 in a direction to relax the clutch spring 223, and the second pressing portion 225d of the guide washer 225 presses the end 223b in a direction to tighten the clutch spring 223. Furthermore, at a position where the second pressing portion 225d of the guide washer 225 abuts against the end 223b of the clutch spring 223, a small gap is formed between the pressing portion 222d of the cam drive 222 and the end 223a of the clutch spring 223. As the pressing portion 222d moves through this gap, the guide pin 224 can move to the disengagement position, as will be described later.

[0065] The three guide pins 224 are disposed between a pair of protrusions 225a, 225b of the guide washer 225 so as to rotate together in the circumferential direction but move relative to each other in the radial direction. The guide pins 224 move radially outward by moving along the cam surface 222b of the cam drive 222. As shown in FIG. 11(b), when each guide pin 224 has moved to its farthest radial position toward the center, it is in a non-transmitting state in which it does not engage with the engaging portion 226a of the case 226. On the other hand, as shown in FIG. 11(c), when each guide pin 224 has moved to its farthest radial position toward the center, it is in a transmitting state in which it engages with the engaging portion 226a.

[0066] The configuration for connecting the first and second clutch devices 220, 230 to the operation unit 190 will be described with reference to Fig. 12. As shown in Fig. 12, the first clutch device 220 has a shaft 221 inserted through the first drive gear 206 and fitted into the first bearing portion 194 of the operation unit 190. Furthermore, the first clutch device 220 is engaged with the first engagement protrusion 207a of the first transmission member 207 inserted into the cam drive insertion hole 222a of the cam drive 222. In this manner, the first clutch device 220 is connected to the operation unit 190.

[0067] 12, the second clutch device 230 has a shaft 231 inserted through the second drive gear 210 and fitted into the second bearing portion 195 of the operation unit 190. In addition, in the second clutch device 230, a second engagement protrusion 211a of the second transmission member 211 is engaged with a cam drive insertion hole 232a of a cam drive 232 described later.

[0068] As described above, by connecting the first and second clutch devices 220, 230 to the operation unit 190, one ends of the first and second winding pipes 130, 140 are rotatably supported. In this way, the operation unit 190 functions as a side bracket. Note that, since the first and second clutch devices 220, 230 of this embodiment can be general clutch devices such as those disclosed in Patent Document 1 (Japanese Patent No. 6184883), a more detailed description will be omitted.

[0069] The above has described the configuration of the roller blind 100. Below, the power transmission switching operation of the drive gear mechanism 200 will be described with reference to Fig. 13. Fig. 13 is a side view showing the state of transmission of drive force, where (a) is the state when input to the first drive gear 206, and (b) is the state when input to the second drive gear 210.

[0070] When power is input to the first drive gear 206, the switching rod 181 is rotated clockwise as shown in Figure 13(a). This causes the slider 182 to move rearward, the swing lever 184 to swing counterclockwise, and the first relay gear 204 and the second relay gear 208 to mesh together. In this state, the cord stopper 161 is pulled downward to pull the operating cord 160. This causes the operating cord 160 to unwind from the pulley 150, causing the pulley 150 to rotate clockwise. The input gear 202, which rotates integrally with the pulley 150, rotates clockwise, the first relay gear 204 counterclockwise, the second relay gear 208 clockwise, and the first drive gear 206 counterclockwise.

[0071] When power is input to the second drive gear 210, the switching rod 181 is rotated counterclockwise as shown in Figure 13(b). This causes the slider 182 to move forward, the swing lever 184 to swing clockwise, and the first relay gear 204 and the second drive gear 210 to mesh together. In this state, the cord stopper 161 is pulled downward to pull the operating cord 160. This causes the operating cord 160 to unwind from the pulley 150, causing the pulley 150 to rotate clockwise. The input gear 202, which rotates integrally with the pulley 150, rotates clockwise, the first relay gear 204 rotates counterclockwise, and the second drive gear 210 rotates clockwise.

[0072] The above has described the power transmission switching operation of the drive gear mechanism 200. Below, the raising and lowering operation of the roller blind 100 will be described with reference to Figures 14 to 18. Figures 14 to 18 are diagrams showing the raising and lowering operation of the roller blind.

[0073] (1) First screen 110: Upper limit stop, second screen 120: Upper limit stop 14(a), the slider 182 of the switching mechanism 180 has moved rearward, and the first relay gear 204 has been raised by the swing lever 184. The drive gear mechanism 200 is in a state in which the raised first relay gear 204 and the second relay gear 208 are in mesh, and power can be transmitted from the pulley 150 to the first drive gear 206. Because the pulley 150 is stopped, the first clutch device 220 is in a state in which power is not transmitted from the first drive gear 206 to the first clutch device 220. Similarly, the second clutch device 230 is in a state in which the first relay gear 204 is not in mesh with the second drive gear 210, and power transmission to the pulley 150 is cut off.

[0074] In this case, the first relay gear 204 may be in a state where it meshes with the second drive gear 210 , or in a state where it does not mesh with either the first drive gear 206 or the second drive gear 210 .

[0075] (2) First screen 110: descending, second screen 120: stopped at upper limit 14(b), in the switching mechanism 180, the slider 182 has moved rearward, and the first relay gear 204 has been raised by the swing lever 184. In the drive gear mechanism 200, the raised first relay gear 204 and the second relay gear 208 are in mesh with each other, and power can be transmitted from the pulley 150 to the first drive gear 206.

[0076] The operating cord 160 is pulled downward to rotate the pulley 150 in the direction of unwinding the operating cord 160. Then, in the drive gear mechanism 200, the input gear 202 rotates clockwise, the first relay gear 204 rotates counterclockwise, the second relay gear 208 rotates clockwise, and the first drive gear 206 rotates counterclockwise.

[0077] Then, in the first clutch device 220, the first engaging protrusion 207a of the first transmission member 207 rotates the cam drive 222 counterclockwise. Therefore, the cam surface 222b of the cam drive 222 rotates while pushing up the guide pin 224, and the guide pin 224 engages with the engaging portion 226a, causing the case 226 to rotate counterclockwise. Since the first take-up pipe 130 rotates integrally with the case 226, the first screen 110 descends.

[0078] (3) The first screen 110 is lowering, the operating cord 160 is wound around the pulley 150, and the second screen 120 is stopped at the upper limit. 15(a), when the hand is released from the operating cord 160, the pulley 150 rotates in the direction of winding up the operating cord 160, causing the operating cord 160 to rise. Then, in the drive gear mechanism 200, the input gear 202 rotates counterclockwise, the first relay gear 204 rotates clockwise, the second relay gear 208 rotates counterclockwise, and the first drive gear 206 rotates clockwise.

[0079] Therefore, in the first clutch device 220, the first engagement protrusion 207a of the first transmission member 207 rotates the cam drive 222 clockwise. Then, the guide pin 224 is pushed back by the engagement portion 226a, and the engagement with the engagement portion 226a is released. Therefore, the first engagement protrusion 207a rotates relative to the first winding pipe 130 and does not transmit the rotation. Meanwhile, a stopper (not shown) of the first winding pipe 130 is activated to stop the rotation, and the first screen 110 stops at that position.

[0080] (4) First screen 110: Lowering operation, second screen 120: Stopped at upper limit After the operating cord 160 is wound around the pulley 150, the operating cord 160 is pulled again as shown in Figure 15(b). Then, as in (2), the pulley 150, the switching mechanism 180, the drive gear mechanism 200, the first clutch device 220, and the first winding pipe 130 are driven, and the first screen 110 is lowered.

[0081] (5) First screen 110: Lower limit stop, second screen 120: Upper limit stop When the first screen 110 reaches its lowest position and the operating cord 160 is released, the pulley 150, drive gear mechanism 200, and first clutch device 220 are driven, as in (3). Then, the first clutch device 220 disengages from the engaging portion 226a of the guide pin 224, and the stopper of the first winding pipe 130 is activated, stopping its rotation. Therefore, the first screen 110 stops at the lowest position. Furthermore, the pulley 150 stops rotating when it has completely wound up the operating cord 160. Therefore, as shown in FIG. 16(a), the drive gear mechanism 200 and first clutch device 220 stop rotating.

[0082] (6) When the switching mechanism 180 is switched in the state where the first screen 110 is stopped at the lower limit and the second screen 120 is stopped at the upper limit The switching rod 181 is rotated counterclockwise to move the slider 182 forward as shown in Figure 16(b), which causes the swing lever 184 to swing downward and the first relay gear 204 to mesh with the second drive gear 210. This enables the driving force of the pulley 150 to be transmitted to the second clutch device 230.

[0083] (7) First screen 110: Stop at the lower limit, second screen 120: Moving down 17(a), the operating cord 160 is pulled downward to rotate the pulley 150 in the direction of unwinding the operating cord 160. As a result, in the drive gear mechanism 200, the input gear 202 rotates clockwise, the first relay gear 204 rotates counterclockwise, and the second drive gear 210 rotates clockwise.

[0084] Therefore, in the second clutch device 230, the cam drive 232 rotates clockwise due to the second engaging protrusion 211a of the second transmission member 211. Then, the cam surface 232b of the cam drive 232 rotates while pushing up the guide pin 234, and the guide pin 234 engages with the engaging portion 236a, causing the case 236 to rotate clockwise. Since the second winding pipe 140 rotates integrally with the case 236, the second screen 120 descends.

[0085] (8) When the first screen 110 is stopped at the lower limit and the second screen 120 is in the lowering operation, the operating cord 160 is wound around the pulley 150. 17(b), when the hand is released from the operating cord 160, the pulley 150 rotates in the direction of winding up the operating cord 160, causing the operating cord 160 to rise. Then, in the drive gear mechanism 200, the input gear 202 rotates counterclockwise, the first relay gear 204 rotates clockwise, and the second drive gear 210 rotates counterclockwise.

[0086] Therefore, in the second clutch device 230, the second engagement protrusion 211a of the second transmission member 211 rotates the cam drive 232 counterclockwise. Then, the guide pin 234 is pushed back by the engagement portion 236a, and the engagement with the engagement portion 236a is released. Therefore, the second engagement protrusion 211a rotates relative to the second winding pipe 140 and does not transmit the rotation. Meanwhile, a stopper (not shown) of the second winding pipe 140 is activated to stop the rotation, and the second screen 120 stops at that position.

[0087] (9) First screen 110: Stopped at the lower limit, second screen 120: In the downward movement After the operating cord 160 has been wound around the pulley 150, the operating cord 160 is pulled downward again as shown in Figure 18(a). This drives the pulley 150, the drive gear mechanism 200, the second clutch device 230, and the second winding pipe 140, and the second screen 120 descends, as in (7).

[0088] (10) First screen 110: Stop at lower limit, second screen 120: Stop at lower limit When the second screen 120 reaches its lowest position and the operating cord 160 is released, the pulley 150, drive gear mechanism 200, and second clutch device 230 are driven, as in (8). The second clutch device 230 then disengages from the engaging portion 236a of the guide pin 234, and the stopper of the second winding pipe 140 is activated, stopping its rotation. Therefore, the second screen 120 stops at the lowest position. The pulley 150 also stops rotating when it has completely wound up the operating cord 160. Therefore, as shown in FIG. 18(b), the drive gear mechanism 200 and second clutch device 230 stop rotating.

[0089] (Effects of this embodiment) As described above, according to this embodiment, by switching the screen to be operated using the switching mechanism 180, it is possible to open and close the two screens, the first screen 110 and the second screen 120, individually, even with an operation method that simply involves pulling the operation cord 160. Furthermore, when not in use, the operation cord 160 can be wound around the pulley 150 to keep it compact, thereby improving design. Another advantage is that it is possible to prevent people or pets from getting caught in the operation cord 160.

[0090] Furthermore, the first screen 110 and the second screen 120 to be operated can be switched simply by switching the first relay gear 204 between the first position and the second position, making the switching operation easy.

[0091] Furthermore, since the first relay gear 204, which moves to switch between the first screen 110 and the second screen 120 to be operated, moves along a direction perpendicular to the axial direction, the axial size of the switching mechanism 180 can be reduced.

[0092] Furthermore, since the rotational direction of the first drive gear 206 and the rotational direction of the second drive gear 210 can be different from each other, the arrangement of the first winding pipe 130 and the second winding pipe 140 can be flexibly designed depending on the type and specifications of the shielding device.

[0093] It can also be suitably applied to a roll screen with two screens arranged in front and behind.

[0094] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the claims, and it is understood that these modifications and alterations also fall within the technical scope of the present invention.

[0095] For example, in the above embodiment, the switching mechanism 180 moves the slider 182 back and forth by rotating the switching rod 181, but the present invention is not limited to this example. The switching mechanism can be designed arbitrarily as long as it can switch the transmission of the rotation of the pulley to either the first rotating shaft body or the second rotating shaft body. For example, the slider may be moved by moving the switching rod back and forth.

[0096] Furthermore, in the above embodiment, the rotation of the pulley 150 can be transmitted to the first winding pipe 130 and the second winding pipe 140 via the drive gear mechanism 200, the first clutch device 220, and the second clutch device 230, but the present invention is not limited to this example. Any design can be used as long as the rotation of the pulley switched by the switching operation of the switching mechanism can be transmitted to either the first rotating shaft body or the second rotating shaft body.

[0097] In the above embodiment, the first relay gear 204 is configured to be movable between the first position and the second position along a direction perpendicular to the axial direction, but the present invention is not limited to this example. The moving direction of the first relay gear can be designed arbitrarily.

[0098] In the above embodiment, the swing lever 184 has an opening 184a through which the input gear 202 can be inserted, and swings around the axis of the input gear 202 inserted through the opening 184a, but the present invention is not limited to this example. For example, the swing member and the input gear may be located at positions separated from each other.

[0099] Furthermore, in the above embodiment, the second relay gear 208 is provided between the first relay gear 204 and the first drive gear 206, but the present invention is not limited to this example. For example, a second relay gear may be provided between the first relay gear and the second drive gear. Also, second relay gears may be provided both between the first relay gear and the first drive gear and between the first relay gear and the second drive gear, so that the first and second winding pipes rotate in the same direction when winding up the screen. Furthermore, the second relay gear may be omitted, so that power can be transmitted directly from the first relay gear to the first drive gear or the second drive gear, so that the first and second winding pipes rotate in the same direction when winding up the screen.

[0100] The above-described embodiments, applications, modifications, etc. can be implemented in appropriate combinations. [Explanation of symbols]

[0101] 100 Roller Screen (Shielding Device) 101 Bracket 102 Set Frames 103 Side Plate 110 First screen (first shielding material) 120 Second screen (second shielding material) 130 First winding pipe (first rotating shaft) 140 Second winding pipe (second rotating shaft) 150 pulley 151 Pulley rotation support part 152 Engagement protrusion 160 Operation cord (operation member) 161 Cord stopper 170 Power spring (biasing member) 180 Switching Mechanism 181 Switching Rod 182 Slider 182a Protrusion 182b Connecting piece 183 Support shaft 184 Swing lever 184a opening 185 Switching input section 190 Operation Unit 191 Operation unit case 191a Slide support 191b Swing support part 191c Support shaft insertion hole 191d Rotation support part 192 Chord Guide 193 Slider housing 194 1st bearing part 195 2nd bearing part 196 Cover 200 Drive gear mechanism 202 Input Gear 202a Input section 202b Insertion hole 204 First Relay Gear 204a Through hole 206 First drive gear 206a First through hole 207 First transmission member 207a 1st engagement protrusion 208 Second Relay Gear 208a Shaft 210 Second drive gear 210a Second through hole 211 Second transmission member 211a 2nd engagement protrusion 220 First clutch device 221, 231 shaft 222, 232 Cam Drive 222a, 232a Cam drive insertion hole 222b, 232b cam surface 222c Engagement surface 222d Pressing part 223 Clutch spring 223a, 223b end 224, 234 Guide pin 225 Guide washer 225a, 225b protrusion 225c First pressing part 225d Second pressing part 226, 236 cases 226a, 236a engaging part 230 Second clutch device

Claims

1. A shielding device comprising: a first shielding material, a second shielding material, a first rotating shaft that opens and closes the first shielding material, and a second rotating shaft that opens and closes the second shielding material, a pulley that rotates and drives the first rotating shaft and the second rotating shaft; an operating member connected at one end to the pulley and operable to rotate the pulley in one direction by a pulling operation; a biasing member that biases the pulley in another direction; a switching mechanism that can switch transmission of rotation of the pulley to either the first rotating shaft body or the second rotating shaft body; a drive gear mechanism capable of transmitting rotation of the pulley to the first rotating shaft and the second rotating shaft; Equipped with The drive gear mechanism includes: an input gear provided so as to be rotatable integrally with the pulley; a first relay gear that is movable between a first position where the rotation of the input gear can be transmitted to the first rotating shaft and a second position where the rotation of the input gear can be transmitted to the second rotating shaft by a switching operation of the switching mechanism; a first drive gear to which rotation of the first relay gear is transmitted when the first relay gear is moved to the first position; a second drive gear to which rotation of the first relay gear is transmitted when the first relay gear is moved to the second position; A shielding device comprising:

2. a first clutch device provided between the first drive gear and the first rotating shaft, which transmits or does not transmit the rotation of the first drive gear to the first rotating shaft depending on the rotation direction of the first drive gear; a second clutch device provided between the second drive gear and the second rotating shaft, which transmits or does not transmit the rotation of the second drive gear to the second rotating shaft depending on the rotation direction of the second drive gear; 2. The shielding device according to claim 1, comprising:

3. The shading device according to claim 1 , wherein the first relay gear is provided so as to be movable between the first position and the second position along a direction perpendicular to the axial direction.

4. The switching mechanism includes a switching operation unit that is rotated by an operator; a movable member that receives rotation of the switching operation unit and is provided so as to be linearly movable in a forward and backward direction in accordance with the rotation direction of the switching operation unit; a swinging member that has a support shaft that rotatably supports the first relay gear and converts the linear motion of the movable member into a swinging motion along the orthogonal direction; Equipped with 4. The shading device according to claim 3, wherein the position of the first relay gear is switched between the first position and the second position depending on the swing direction of the swing member.

5. 5. The shielding device according to claim 4, wherein the swinging member has an opening through which the input gear can be inserted, and swings about an axis of the input gear inserted into the opening.

6. The shading device according to any one of claims 1 to 5, further comprising a second relay gear provided between the first relay gear and the first drive gear, or between the first relay gear and the second drive gear.

7. the first shielding material and the second shielding material are each a screen, The shielding device described in claim 1, characterized in that the first rotating shaft body and the second rotating shaft body are arranged so that their axial center positions are different from each other in the front-to-back and top-to-bottom directions, and are winding pipes that can wind and unwind the first shielding material and the second shielding material, respectively.

Images