JP7219586B2 - roll screen - Google Patents

Description

The present invention relates to roll screens.

A conventional roll screen is disclosed in Japanese Utility Model Laid-Open No. 60-10096 (Patent Document 1). In the same document, a roller holder having a plurality of mounting holes provided at appropriate intervals on one end is attached to the outer surface of a bracket base so as to be angle-adjustable, and a screen drawer guide is attached to the inside of the other end of the roller holder. It is disclosed with rollers.

According to this, regardless of the thickness of the screen wound around the roller pipe, the screen pull-out position can be brought close to the window surface and always held at a fixed position. Therefore, there is an effect that the incident light from the window surface can be shielded.

Japanese Utility Model Laid-Open No. 60-10096

However, in the conventional roll screen as disclosed in Patent Document 1, the roller holder is always held at a fixed position. In addition, it is necessary to install it so that there is a gap between the screen and the window surface. As a result, the gap between the screen and the window surface cannot be closed, and there is a problem that light leaks into the room. Such a problem may occur even when the object on which the screen is installed is other than the window surface.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of such problems, and an object of the present invention is to provide a roll screen capable of closing the gap between the screen and an object.

In order to solve the above problems, according to the present invention, there is provided a roll screen provided with a screen one end of which is connected to a winding pipe so as to be wound up and unwound, wherein the hanging position of the screen is adjusted to an object. It is characterized by providing a position switching mechanism capable of moving between a position close to the object and a position away from the object, and switching the hanging position of the screen at different positions when the screen is stopped and when the screen is raised and lowered. A roll screen is provided.

According to this configuration, by providing a position switching mechanism that can suspend the screen at a position different from that during screen elevation when the screen is stopped from being raised or lowered, , the screen can be brought closer to an object (such as a window frame, a wall, or another screen). Therefore, it does not affect the up-and-down operation of the screen. Also, the screen can be brought close to or in contact with the object, and if the object is a window frame, for example, light leakage from the periphery of the screen can be prevented.

Various applications are possible for the present invention. For example, the position switching mechanism includes a support shaft that supports the screen at a hanging position, and a swing arm that is connected to the support shaft and can swing back and forth, and the swing arm swings back and forth. By doing so, the support shaft may be switched between a position close to the object and a position away from the object. According to this configuration, by providing the swing arm that swings back and forth, the screen hanging down via the support shaft can be easily switched between a state of being close to the object and a state of being separated from the object. can be done.

Further, the position switching mechanism may include a swing operation section for manually swinging the swing arm back and forth. According to this configuration, the swing arm can be stopped at an arbitrary position and the swing arm can be swung back and forth by manually operating the swing operation section for swinging the swing arm back and forth. can be easily operated.

Further, the position switching mechanism may switch the hanging position of the screen in conjunction with the operation of an elevating unit for elevating the screen. According to this configuration, the position switching mechanism can be linked with the operation of the elevating unit for elevating the screen, thereby reducing the number of parts.

ADVANTAGE OF THE INVENTION According to this invention, the roll screen which can block the clearance gap between a screen and an object is provided. Other effects of the present invention will also be described in the mode for carrying out the invention, which will be described later.

It is the front view which showed roughly the whole structure of the roll screen 100. FIG. 4 is a rear view for explaining the configuration of the winding pipe 120. FIG. 4 is a diagram for explaining the configuration of a position switching mechanism 140; FIG. FIG. 4 is a diagram for explaining the operation of the roll screen 100, and is a diagram showing the operation during the upward/downward movement of the screen 130. FIG. FIG. 4 is a diagram for explaining the operation of the roll screen 100, and shows a state in which the screen 130 is fully closed. FIG. FIG. 13 is a rear view showing a state in which the screen 130 is fully closed and is supported by the window frame WF; It is a figure for demonstrating the structure of the roll screen 200 of 2nd Embodiment. FIG. 8 is a cross-sectional view taken along the line AA of FIG. 7; FIG. 10 is a diagram showing a state when the screen 230 is lifted; FIG. 10 is a diagram showing a state in which the screen 230 is fully closed and is close to the window frame WF; FIG. 11 is a diagram for explaining the configuration of a roll screen 300 according to a third embodiment; FIG. FIG. 13 is a diagram showing a state when the screen 330 is lifted; FIG. 10 is a diagram showing a state in which the screen 330 is fully closed and is close to the window frame WF; It is a figure for demonstrating the structure of the roll screen 400 of 4th Embodiment. FIG. 10 is a diagram showing a state in which the screen 430 is fully closed and is close to the window frame WF;

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present specification and drawings, constituent elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.

The overall configuration of the roll screen 100 of the present embodiment will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a diagram schematically showing the overall configuration of a roll screen 100. As shown in FIG. FIG. 2 is a diagram for explaining the structure of the winding pipe 120. As shown in FIG. As shown in FIG. 1, the roll screen 100 includes a screen 130 whose one end is connected to a winding pipe 120 so as to be wound up and unwound. ) and a position away from the window frame WF, and a position switching mechanism 140 for switching the hanging position of the screen 130 at different positions between when the screen is stopped and when the screen is raised and lowered. It is characterized by Hereinafter, each component of the roll screen 100 of this embodiment will be described.

The winding pipe 120 is attached to the window frame WF by the support member 110 . As shown in FIG. 1, the support member 110 includes a side plate 112 that rotatably supports the winding pipe 120 and a set frame 114 that fixes the side plate 112 to the window frame WF. be. The side plates 112 are provided at both ends of the set frame 114 and fixed to the top of the window frame WF by brackets 116 . As shown in FIG. 2, the left and right side plates 112 are formed with cylindrical portions 112a protruding toward the opposing side plates 112. As shown in FIG. A fixed shaft 118 is fixed to the center of the cylindrical portion 112a so as to protrude in the direction of the opposing side plate 112. As shown in FIG.

(Winding pipe 120)
The winding pipe 120 raises and lowers the screen 130 . As shown in FIG. 1, the winding pipe 120 is connected to the upper end of the screen 130 so that it can be wound and unwound. A bearing 122 is fitted to one end of the winding pipe 120 as shown in FIG. The winding pipe 120 is rotatably supported by a fixed shaft 118 fixed to one side plate 112-1 via a bearing 122. As shown in FIG. A position switching mechanism 140, which will be described later, is provided between one end of the winding pipe 120 and one side plate 112-1.

A winding pipe stopper 124 for restraining the rotation of the winding pipe 120 is fitted to the other end of the winding pipe 120, as shown in FIG. The winding pipe 120 is rotatably supported by a fixed shaft 118 fixed to the other side plate 112-2 via a winding pipe stopper 124. As shown in FIG. Between the other end of the winding pipe 120 and the other side plate 112-2, an elevating unit 126 for rotating the winding pipe 120 and a position switching mechanism 140 for switching the hanging position of the screen 130 are provided. It is Elevating unit 126 has a general configuration including pulley 127 that rotates integrally with winding pipe 120 and operation chain 128 that operates the rotation of pulley 127 .

(screen 130)
The screen 130 closes the window opening WA. As shown in FIG. 1, the screen 130 is connected to the winding pipe 120 so that the winding pipe 120 can be wound and unwound. A weight bar 132 is attached to the lower end of the screen 130 .

(Position switching mechanism 140)
The position switching mechanism 140 can move the hanging position of the screen 130 between a position close to the window frame WF and a position away from the window frame WF. let it hang down The position switching mechanism 140 is provided over the left and right side plates 112 as shown in FIG. The position switching mechanism 140 will be described below with reference to FIG. FIG. 3 is a diagram for explaining the configuration of the position switching mechanism 140. As shown in FIG.

The position switching mechanism 140 includes a support shaft 142 that supports the screen 130 at a hanging position, and a swing arm 144 that is connected to the support shaft 142 and swings back and forth. By swinging the swing arm 144 back and forth, the support shaft 142 is switched between a state near the window frame WF and a state separated from the window frame WF.

The support shaft 142 has a cylindrical shape slightly longer than the winding pipe 120 . The support shaft 142 is arranged at a position where it does not interfere with the screen 130 wound on the winding pipe 120 .

The swing arm 144 swings by rotatably fitting a circular concave portion 144 a to the cylindrical portion 112 a of the side plate 112 . A spring 146 is arranged in the recess 144a. A fixed shaft 118 is inserted through the center of the spring 146 . One end of the spring 146 is fixed to the fixed shaft 118 and the other end of the spring 146 is fixed to the swing arm 144 . A spring 146 biases the swing arm 144 in a direction to push up the support shaft 142 . A lower portion of the swing arm 144 protrudes from the side plate 112 and is connected to the end of the support shaft 142 .

A swing operation portion 148 for operating the swing of the swing arm 144 is provided at the lower end of the swing arm 144 . The swing operating portion 148 includes a joint 148b that oscillatably connects an elongated bar-shaped operating portion 148a and the swing arm 144. As shown in FIG. By pulling down the operation portion 148a, the swing arm 144 can be swung.

A rocking arm stopper 150 for switching the rocking arm 144 between a rockable state and a rocking restricted state is provided so as to rotate integrally with the rocking arm 144 . The swing arm stopper 150 is arranged in the bearing 122 of the winding pipe 120 and supported by the fixed shaft 118 . The rocking arm stopper 150 restrains the rocking motion of the rocking arm 144 by being locked to the fixed shaft 118, and enables the rocking arm 144 to rock by releasing the locking to the fixed shaft 118. . By operating the swing operating portion 148, the locking and unlocking of the swing arm stopper 150 are switched. The rocking arm stopper 150 restricts the rocking motion of the rocking arm 144 with the support shaft 142 positioned downward.

The configuration of the roll screen 100 of the present embodiment has been described above. Next, the operation of the roll screen 100 of this embodiment will be described with reference to FIGS. 4 to 6. FIG. 4A and 4B are diagrams for explaining the operation of the roll screen 100, and are diagrams showing the operation during the lifting and lowering of the screen 130. FIG. FIG. 5 is a diagram for explaining the operation of the roll screen 100, and shows a state in which the screen 130 is fully closed. FIG. 6 is a rear view showing a state in which the screen 130 is fully closed and close to the window frame WF.

When the screen 130 is moved up and down, as shown in FIG. 4, the operation portion 148a is pulled down to swing the swing arm 144, and the support shaft 142 is arranged downward. Then, the rocking motion of the rocking arm 144 is restrained by the rocking arm stopper 150 . Therefore, the position of the screen 130 hanging down from the support shaft 142 is separated from the window frame WF. Also, the spring 146 deforms and stores elastic energy. Next, the operating chain 128 is operated to rotate the winding pipe 120 by the elevating section 126 to elevate the screen 130 . At this time, since the screen 130 is separated from the window frame WF by the position switching mechanism 140, it moves up and down without contacting the window frame WF.

When the screen 130 is stopped, as shown in FIG. 5, the operation portion 148a is pulled downward by a predetermined amount to release the swing arm stopper 150. As shown in FIG. Then, the swing arm 144 swings in the direction to raise the support shaft 142 by the restoring force of the spring 146, and the support shaft 142 stops at a position close to the window frame WF. Therefore, as shown in FIGS. 5 and 6, the screen 130 hangs close to the window frame WF.

(Effect of the first embodiment)
As described above, according to the present embodiment, the screen 130 stops moving up and down by providing the position switching mechanism 140 that can suspend the screen at a position different from that during the screen up/down when the screen stops moving up and down. After that, the screen 130 can be moved to the window frame WF. Therefore, it does not affect the up-and-down operation of the screen 130 . Further, the screen 130 can be brought close to or in contact with the window frame WF, and light leakage from the periphery of the screen 130 can be prevented.

In addition, by providing a swing arm 144 that swings back and forth, the screen 130 hanging down via the support shaft 142 can be easily switched between a state near the window frame WF and a state separated from the window frame WF. be able to.

Further, by manually operating the swing operation portion 148 for swinging the swing arm 144 back and forth, the locking and unlocking of the swing arm stopper 150 can be switched. It is possible to easily operate to stop at a position and to swing the swing arm 144 .

(Second embodiment)
A configuration of a roll screen 200 according to the second embodiment will be described with reference to FIGS. 7 and 8. FIG. FIG. 7 is a diagram for explaining the configuration of the roll screen 200 of this embodiment. This embodiment differs from the first embodiment mainly in the configuration of the position switching mechanism 240 . In this embodiment, the points different from the first embodiment will be mainly described. Constituent elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.

The side plate 212, pulley 227, operating chain 228, and screen 230 of this embodiment are substantially the same as the side plate 112, pulley 127, operating chain 128, and screen 130 of the first embodiment.

The position switching mechanism 240 switches the position in conjunction with the operation of the elevating section 226 that elevates the screen 230 . The lifting section 226 is composed of a pulley 227 and an operating chain 228, as shown in FIGS. The shaft portion 227a of the pulley is rotatably fitted to the outer periphery of the fixed shaft 218. As shown in FIG. A rocking arm 244 and a clutch spring 229 are fitted to the outer periphery of the shaft portion 227a of the pulley so as to be aligned in the axial direction. The swing arm 244 and the clutch spring 229 are configured to rotate integrally as described later, and they rotate integrally or relative to the shaft portion 227a of the pulley.

As shown in FIG. 7, the fixed shaft 218 is provided with two fixed shaft projections 218a and 218b at positions facing each other in the circumferential direction. The projections 218a, 218b of the fixed shaft extend axially parallel to the fixed shaft 218 to the position of the swing arm 244, as shown in FIG. A pulley shaft portion 227a and a clutch spring 229 are arranged between the fixed shaft 218 and the projections 218a and 218b of the fixed shaft.

Both ends 229a, 229b of the clutch spring protrude radially outward. Between both end portions 229a and 229b of the clutch spring, a protrusion 244a of a swing arm, which will be described later, is arranged.

The swing arm 244 is provided with a fan-shaped swing arm projection 244a protruding in the axial direction. The lug 244a of the swing arm is arranged between the ends 229a, 229b of the clutch spring so as to contact them. Therefore, the swing arm 244 and the clutch spring 229 rotate together. Note that the protrusion 244a of the swing arm and both ends 229a and 229b of the clutch spring do not necessarily have to be in contact with each other. It may also be configured to rotate relative to the end portions 229a and 229b of one of the clutch springs until they come into contact with each other, and then rotate integrally after coming into contact with them.

The configuration of the roll screen 200 of the present embodiment has been described above. Hereinafter, the operation of the roll screen 200 will be described with reference to FIGS. 9 and 10 in addition to FIG. 7 described above. FIG. 9 is a diagram showing a state when the screen 230 is raised. FIG. 10 is a diagram showing a state in which the screen 230 is fully closed and close to the window frame WF.

First, the case of lowering the screen 230 will be described. When lowering the screen 230, the rear side 228a of the operating chain is pulled down as shown in FIG. Then, the pulley 227 rotates in the direction to lower the screen 230, and the clutch spring 229 fastened to the pulley 227 also rotates in the same direction.

When the clutch spring 229 rotates, the swing arm 244 held by the end portion 229a of the clutch spring swings downward due to its own weight, and the support shaft 242 moves downward. When the end portion 229a of the clutch spring rotates until it abuts against the protrusion 218a of the fixed shaft, further rotation is restricted, and the downward swinging of the swing arm 244 is restrained. Therefore, since the swing arm 244 is held in a state of being tilted obliquely downward from the horizontal, the screen 230 hangs down from the support shaft 242 at a position spaced apart from the window frame WF. When the rear side 228a of the operating chain is further pulled to continue the rotation of the pulley 227, the clutch spring 229 is loosened and only the pulley 227 continues to rotate. Therefore, the screen 230 descends at a position separated from the window frame WF.

Next, the case of raising the screen 230 will be described. When raising the screen 230, the front side 228b of the operating chain is pulled down as shown in FIG. Then, the pulley 227 rotates in the direction to raise the screen 230, and the clutch spring 229 fastened to the pulley 227 also rotates in the same direction.

When the clutch spring 229 rotates, the swing arm 244 held by the end 229a of the clutch spring swings upward, and the support shaft 242 moves upward. At this time, since the projection 244a of the swing arm presses the end 229a of the clutch spring, the clutch spring 229 is tightened, and the swing arm 244 rises together with the clutch spring 229. As shown in FIG.

When the end 229b of the clutch spring rotates until it abuts against the protrusion 218b of the fixed shaft, and the front side 228b of the operating chain is pulled to continue the rotation of the pulley 227, the clutch spring 229 loosens and only the pulley 227 continues to rotate. . At this time, since the protrusion 244a of the swinging arm presses the end 229a of the clutch spring, the clutch spring 229 continues to be tightened with enough force to hold the swinging arm 244 upward without swinging downward. The moving arm 244 is held in a state inclined upward from the horizontal. Therefore, the screen 230 rises at a position separated from the window frame WF.

Next, a case where the up-and-down motion of the screen 230 is stopped will be described. When the screen 230 stops moving up and down, as shown in FIG. 10, the operation of the operating chain 228 is stopped and the rotation of the pulley 227 is stopped. Therefore, the rocking arm 244 tries to descend by its own weight, but the projection 244 a of the rocking arm presses the end 229 a of the clutch spring, so that the clutch spring 229 is engaged with the pulley 227 . Therefore, when the pulley 227 is rotated to a position where the swing arm 244 becomes horizontal, the screen 230 hangs down from the support shaft 242 at a position closer to the window frame WF.

(Effect of Second Embodiment)
As described above, according to this embodiment, the position switching mechanism 240 can be interlocked with the operation of the elevating section 226 for elevating the screen 230, thereby reducing the number of parts.

(Third Embodiment)
A configuration of a roll screen 300 according to the third embodiment will be described with reference to FIG. 11 . FIG. 11 is a diagram for explaining the configuration of the roll screen 300 of this embodiment. This embodiment is characterized in that the position switching mechanism 340 switches the hanging position of the screen 330 in conjunction with the operation of the elevating unit 326 for elevating the screen 330 . The configuration of the position switching mechanism 340 is mainly different from that of the first embodiment. In this embodiment, the points different from the first embodiment will be mainly described. Constituent elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.

The winding pipe 320, pulley 327, operating chain 328, and screen 330 of this embodiment are substantially the same as the winding pipe 120, pulley 127, operating chain 128, and screen 130 of the first embodiment.

The position switching mechanism 340 switches the position in conjunction with the operation of the elevating section 326 (pulley 327 and operating chain 328 ) that elevates the screen 330 . As shown in FIG. 11, the position switching mechanism 340 has an elongated swing arm 344 , one end of which is provided with a support shaft 342 , and the other end of which is radially wider than the winding pipe 320 . protrudes to The swing arm 344 is rotatably supported on the fixed shaft 318 .

The swing arm 344 rotates when a swinging force is applied from an operation chain 328 (to be described later), but otherwise does not rotate due to friction with the fixed shaft 318 .

A protruding portion 344a that protrudes toward the pulley 327 is formed at the rotation center portion of the swing arm 344, and inclined portions 344b and 344c that can be engaged with the operating chain 328 are formed at both ends of the protruding portion 344a in the longitudinal direction. formed. The inclined portions 344b and 344c are formed in a substantially chevron shape, and their upper ends are located at substantially the same position as the bottom of the recessed portion 327a of the pulley with which the operating chain 328 is engaged. Therefore, the operating chain 328 can enter the inclined portions 344b and 344c without resistance.

In addition, the radially protruding ends of the inclined portions 344b and 344c (that is, the apex of the substantially inverted V shape) are located at substantially the same position as the upper end of the recessed portion 327a of the pulley. Therefore, the lower portion of the operating chain 328 abuts on the tips of the inclined portions 344b and 344c.

Furthermore, any structure may be used from the tip to the lower end of the inclined portions 344b and 344c as long as it does not interfere with the movement of the operating chain 328. FIG. For example, in the present embodiment, the lower ends of the inclined portions 344b and 344c are located in the middle of the recessed portion 327a of the pulley in the depth direction so as not to interfere with the movement of the operating chain 328. FIG.

Since the inclined portions 344b and 344c are configured to gradually protrude radially from the upper end toward the tip, the inclined portions 344b and 344c move toward the tip as the operation chain 328 enters the inclined portions 344b and 344c from the upper end. A force is applied to oscillate downward.

The configuration of the roll screen 300 of the present embodiment has been described above. Hereinafter, the operation of the roll screen 300 will be described with reference to FIGS. 12 and 13 in addition to FIG. 11 described above. FIG. 12 is a diagram showing the state when the screen 330 is raised. FIG. 13 is a diagram showing a state in which the screen 330 is fully closed and close to the window frame WF.

First, the case of lowering the screen 330 will be described. When lowering the screen 330, as shown in FIG. 11, the rear side 328a of the operating chain is pulled down. Then, the pulley 327 rotates in the direction to lower the screen 330 . At the same time, the rear side 328a of the operating chain engages the inclined portion 344b and applies a downward swinging force. Therefore, the swing arm 344 swings downward, and the screen 330 separates from the window frame WF. While the rear side 328a of the operating chain is being operated, a downward swinging force is applied to the inclined portion 344b, so that the swing arm 344 continues to swing downward. Therefore, during the lowering operation, the screen 330 is kept separated from the window frame WF.

Next, the case of raising the screen 330 will be described. When raising the screen 330, the front side 328b of the operating chain is pulled down as shown in FIG. Then, the pulley 327 rotates in the direction to raise the screen 330 . At the same time, the front side 328b of the operating chain engages the inclined portion 344c and applies a downward swinging force. Therefore, the swing arm 344 swings upward, and the screen 330 separates from the window frame WF. While the front side 328b of the operation chain is being operated, a downward swinging force is applied to the inclined portion 344c, so that the swing arm 344 keeps swinging upward. Therefore, during the lifting operation, the screen 330 is kept separated from the window frame WF.

Next, a case where the up-and-down motion of the screen 330 is stopped will be described. When the screen 330 stops moving up and down, the operation chain 328 is operated to level the swing arm 344 as shown in FIG. Since no swinging force is applied to the swing arm 344 from the operation chain 328, the rotation is restricted by the friction with the fixed shaft 318, and the horizontal state is maintained.

(Effect of the third embodiment)
As described above, according to the present embodiment, the position switching mechanism 340 can be interlocked with the operation of the elevating section 326 for elevating the screen 330, thereby reducing the number of parts.

In this embodiment, the swing arm 344 is configured to maintain a horizontal state by friction with the fixed shaft 318, but the configuration is not limited to this. For example, a clutch spring may be provided between the swing arm 344 and the fixed shaft 318 so that the swing arm 344 is held horizontally by the biasing force of the clutch spring. In this case, two clutch springs, one for returning the swing arm 344 to the horizontal state from below and the other for returning the swing arm 344 to the horizontal state from above, may be provided.

(Fourth embodiment)
A configuration of a roll screen 400 according to the fourth embodiment will be described with reference to FIG. 14 . FIG. 14 is a diagram for explaining the configuration of the roll screen 400 of this embodiment. This embodiment mainly differs from the second embodiment in the configuration of the position switching mechanism 440 . In this embodiment, the points different from the second embodiment will be mainly described. Constituent elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.

The winding pipe 420, pulley 427, operating chain 428, and screen 430 of this embodiment are substantially the same as the winding pipe 220, pulley 227, operating chain 228, and screen 230 of the second embodiment.

The position switching mechanism 440 switches the position in conjunction with the operation of the elevating section 426 (pulley 427 and operating chain 428 ) that elevates the screen 430 . The position switching mechanism 440 includes a support shaft 442, a swing arm 444, and a pinion gear 446, as shown in FIG. The support shaft 442 is provided at the rear end of the swing arm 444 . The swing arm 444 is provided with a rack gear 444a that meshes with the pinion gear 446, and moves horizontally forward and backward as the pinion gear 446 rotates.

The pinion gear 446 is fitted to the shaft portion 427a of the pulley so as to rotate integrally therewith. When the pulley 427 rotates in the screen lowering direction, the pinion gear 446 feeds the rack gear 444a rearward (to approach the window frame WF), and the swing arm 444 moves rearward. Further, when the pulley 427 rotates in the upward direction of the screen, the pinion gear 446 feeds the rack gear 444a forward (in the direction away from the window frame WF), and the swing arm 444 moves forward.

The configuration of the roll screen 400 of the present embodiment has been described above. The operation of the roll screen 400 will be described below with reference to FIG. 15 in addition to FIG. 14 described above.

First, the case of raising the screen 430 will be described. When raising the screen 430, the front side 428b of the operating chain is pulled down as shown in FIG. Then, the pulley 427 rotates in the direction to raise the screen 430 . The pinion gear 446 rotates integrally with the pulley 427 to send the rack gear 444a forward. Therefore, the swing arm 444 moves forward, and the screen 430 supported by the support shaft 442 moves away from the window frame WF. Therefore, while the screen 430 is being raised, the screen 430 is raised while being separated from the window frame WF. When the pulley 427 stops rotating, the pinion gear 446 also stops rotating together with the pulley 427, so that the swing arm 444 is held at that position.

Next, the case of lowering the screen 430 will be described. When lowering the screen 430, as shown in FIG. 15, the rear side 428a of the operating chain is pulled down. Then, the pulley 427 rotates in the direction to lower the screen 430 . The pinion gear 446 rotates integrally with the pulley 427 to send the rack gear 444a rearward. Therefore, the swing arm 444 moves rearward, and the screen 430 supported by the support shaft 442 approaches the window frame WF. Therefore, while the screen 430 is being lowered, the screen 430 is lowered while being separated from the window frame WF.

When the screen 430 descends to the fully closed position and the pulley 427 stops rotating, the pinion gear 446 also stops rotating together with the pulley 427 . Also, at this time, the swing arm 444 has moved to a position close to the window frame WF, and the rotation of the pinion gear 446 is stopped so that the swing arm 444 is held at that position.

(Effect of the fourth embodiment)
As described above, according to this embodiment, the position switching mechanism 440 can be interlocked with the operation of the elevating section 426 for elevating the screen 430, thereby reducing the number of parts.

Although 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 obvious that a person skilled in the art can conceive of various modifications or modifications within the scope described in the claims, and these also belong to the technical scope of the present invention. Understood.

For example, in the above embodiment, the window frame is described as an example of the object on which the screen is installed, but the present invention is not limited to this. The screen can be installed on any wall, partition, or the like. Since the screen does not come into contact with the object when the screen is raised and lowered, there is an effect that it is possible to prevent the screen from being affected by the raising and lowering operation.

Further, in the fourth embodiment, the pinion gear 446 is fitted to the shaft portion 427a of the pulley so as to rotate together. good too. With this configuration, the swing arm 444 gradually approaches the window frame WF as the screen 430 is lowered to the lowermost position. to bring the screen 430 closer to or abut the window frame WF.

The contents of the embodiments, modified examples, and application examples described above can be implemented in appropriate combinations.

100, 200, 300, 400 roll screen 110 support member 112, 212 side plate 112-1 one side plate 112-2 other side plate 112a cylindrical portion 114 set frame 116 bracket 118, 218, 318 fixed shaft 120 winding Pipe 122 Bearing 124 Winding pipe stopper 126, 226, 326 Elevator 127, 227, 327, 427 Pulley 128, 228, 328, 428 Operation chain 130, 230, 330, 430 Screen 132 Weight bar 140, 240, 340, 440 Position switching mechanism 142, 242, 342, 442 Support shaft 144, 244, 344, 444 Swing arm 144a Recess 146 Spring 148 Swing operation part 148a Operation part 148b Joint 150 Swing arm stopper 218a, 218b Fixed shaft projection Part 227a, 427a Pulley shaft 228a, 328a, 428a Rear side of operating chain 228b, 328b, 428b Front side of operating chain 229 Clutch spring 229a, 229b End of clutch spring 244a Projection of rocking arm 327a Recess of pulley 344b , 344c inclined portion 444a rack gear 446 pinion gear WF window frame WA window opening

Claims (4)

A roll screen comprising a screen one end of which is connected to a winding pipe so that it can be wound and unwound,
The winding pipe is fixed in position with respect to the object,
The screen hanging from the winding pipe is movable between a hanging position close to the object and a position distant from the object,
A roll screen, comprising a position switching mechanism for switching the hanging position of the screen at different positions when the screen is stopped and when the screen is raised and lowered. The position switching mechanism is
a support shaft that supports the screen at a hanging position;
a swing arm connected to the support shaft and capable of swinging back and forth;
including
2. The roll according to claim 1, wherein said swing arm swings back and forth to switch said support shaft between a position close to said object and a position spaced apart from said object. screen. 3. The roll screen according to claim 2, wherein the position switching mechanism includes a swing operation section for manually swinging the swing arm back and forth. A roll screen comprising a screen one end of which is connected to a winding pipe so that it can be wound and unwound,
the hanging position of the screen is movable between a position close to an object and a position distant from the object;
providing a position switching mechanism for switching the hanging position of the screen at a different position between when the screen is raised and lowered and when the screen is raised and lowered,
The roll screen, wherein the position switching mechanism switches the hanging position of the screen in conjunction with the operation of an elevating unit for elevating the screen.

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