JP2023168039A - screen device - Google Patents

Abstract

To provide a screen device which prevents adjacent sections of a wire that is wound on a winding drum from being entangled with each other.SOLUTION: A screen device includes a screen 3 for opening/closing a building opening, a take-up roller 4 for taking up the screen, a movable bar for operating the opening/closing of the screen, a take-up drum 40 mounted on a drum shaft 29 disposed coaxially with the take-up roller 4, a wire 30 connecting the take-up drum 40 and the movable bar, and a coil spring 34 disposed inside the take-up roller 4, having one end and the other end connected to the take-up roller 4 and the drum shaft 29, and transmitting a torsion urging force to the take-up roller 4 and the drum shaft 29 as a rotational force in the direction in which the screen 3 and the wire 30 are taken up, wherein the take-up drum 40 has a truncated cone shape and has a large diameter portion 41a that is a winding start end of the wire 30 and a small diameter portion 41b that is a winding end of the wire, and a spiral fitting groove 45 into which the wound wire is fitted is formed on the outer periphery of the take-up drum 40 so as to connect the winding start end and the winding end.SELECTED DRAWING: Figure 5

Description

The present invention relates to a screen device that is attached to an opening in a building and used for purposes such as light shielding, blindfolding, and insect protection.

Various types of screen devices have been known that are attached to openings in buildings and used for purposes such as light shielding, blindfolding, and insect protection.
Patent Document 1 discloses a curtain opening/closing device as an example of such a screen device. This curtain opening/closing device opens and closes a building opening by raising and lowering the curtain, and has an operating force adjustment mechanism for adjusting the operating force when opening and closing the curtain.
The operating force adjustment mechanism includes a spindle (drum shaft) arranged parallel to the winding shaft for winding the curtain, a winding reel (winding drum) attached to the spindle, and a winding drum. A hanging rope (wire) whose base end is wound around a take-up reel and whose tip end is connected to the upper end of the curtain, and both ends are connected to the take-up shaft and spindle, and is accumulated by twisting. and a coil spring that transmits a biasing force to the winding shaft and the support shaft as a rotational force in a direction to wind up the curtain and wire, and the coil spring absorbs a difference in rotation between the winding shaft and the winding reel. This adjusts the operating force when opening and closing the curtain.
However, the conventional curtain opening/closing device has a structure in which the winding drum winds the wire multiple times around a cylindrical surface partitioned by a pair of flanges, so the wires wound overlapping each other become entangled. The wires tend to get locked together, making it difficult to smoothly unwind the wire from the winding drum, which may impede the opening/closing operation of the curtain.

Japanese Patent Application Publication No. 8-170477

The technical problem of the present invention is to prevent the wires wound around the winding drum from getting entangled with each other in a screen device having an operating force adjustment mechanism for adjusting the operating force when opening and closing the curtain. The purpose is to enable smooth opening and closing operations.

In order to solve the above problems, the screen device of the present invention includes a screen that opens and closes a building opening, a winding box disposed at one end of the building opening, and a rotatable and detachable screen inside the winding box. A take-up roller that is freely supported and winds up or unwinds the screen when the screen opens and closes the building opening, a movable crosspiece for opening and closing operations attached to the tip of the screen, and a movable crosspiece that allows the curtain to be moved. and an operating force adjustment mechanism for adjusting the operating force when opening and closing, the operating force adjusting mechanism being disposed coaxially with the winding roller and rotatable relative to the winding roller. a drum shaft attached to one end of the drum shaft, a winding drum attached to one end of the drum shaft, a base end connected to the winding drum and hung around inside the building opening, and a distal end connected to the movable crosspiece in the building opening. A wire is connected from the other end, and the wire is disposed inside the take-up roller and has one end and the other end connected to the take-up roller and the drum shaft, and is twisted by relative rotation between the take-up roller and the drum shaft. and a coil spring that accumulates a biasing force and transmits the accumulated biasing force to the winding roller and drum shaft as a rotational force in a direction to wind up the screen and the wire, the winding drum has a conical shape. It has a table-like shape, and has a large diameter part that serves as a winding start end when winding the wire, and a small diameter part that serves as a winding end end when winding the wire, and has an outer circumference of the winding drum. A fitting groove into which the wound wire is fitted is formed so as to spirally connect the large diameter part and the small diameter part.

In the present invention, the fitting groove has an arc shape, the depth of the fitting groove is larger than the curvature deformation of the arc, and the width of the partition separating adjacent fitting grooves is the groove width of the fitting groove. Preferably, it is smaller.

Further, in the present invention, the diameter of the portion of the large diameter portion of the winding drum that becomes the winding start end is equal to the winding diameter of the screen when the winding roller winds up the screen and fully opens the screen. Preferably, the diameter of a portion of the small diameter portion of the winding drum that is the end of the winding is equal to the diameter of the winding roller.

Further, in the present invention, the large diameter portion of the winding drum has a plurality of wire locking holes at different positions on the fitting groove for fixing the base end of the wire and making it a winding start end. The position of the winding start end may be changeable by selectively using the plurality of wire locking holes.

Further, in the present invention, the wire includes a single wire portion having one wire and a double wire portion having two wires connected to the tip of the single wire portion, and the single wire portion is configured to open and close the screen. This is a part that is sometimes wound onto the winding drum or unwound from the winding drum, and the tip of one of the two wires in the double wire section is connected to one end in the length direction of the movable crosspiece. It is preferable that the two wires are connected to each other, and the tip of the other wire is connected to the other end of the movable crosspiece in the length direction.

In the present invention, preferably, bearings are attached to one end and the other end of the winding roller in the axial direction, and brackets provided at both ends of the winding box in the longitudinal direction include a bearing receptacle and a bearing receptacle for the bearing receptacle. A removable bearing holder is provided, and by sandwiching the bearing between the bearing holder and the bearing holder, the winding roller is rotatably and removably supported inside the winding box. It is that you are.

Further, in the present invention, locking members may be attached to both ends of the screen in the width direction to slidably lock onto a screen frame that guides the both ends.

The screen device of the present invention has a spiral fitting groove on the outer circumferential surface of the winding drum, into which the wound wire is fitted, so that the wire is wound in an orderly spiral shape without overlapping. Therefore, the wires do not get tangled with each other and interfere with the opening/closing operation of the screen.

1 is a front view showing an embodiment of a screen device according to the present invention. FIG. 2 is an enlarged view of a main part of the winding box in FIG. 1; FIG. 3 is an exploded view of FIG. 2; FIG. 3 is a perspective view of the bottom of the take-up box. FIG. 2 is an enlarged cross-sectional view of the main part of FIG. 1. FIG. FIG. 3 is a plan view of the bearing. It is a front view of a winding drum. It is a bottom view of a winding drum. FIG. 3 is a longitudinal cross-sectional view of a winding drum. 9 is an enlarged view of the main part of FIG. 9. FIG. FIG. 2 is a schematic plan view of the screen device when the screen is fully opened, with the take-up roller and the take-up drum separated and the number of turns of the coil spring reduced. FIG. 3 is a schematic diagram of the screen device when the screen is half-opened. It is a schematic diagram of the screen device when the screen is fully closed.

1 to 5 show an embodiment of a screen device according to the present invention, and this screen device 1 is a horizontally opening type screen device that opens and closes a building opening by moving the screen 3 laterally. As shown in FIG. 1, a screen winding unit 2 configured to wind up the screen 3 with a winding roller 4 is detachably attached to a rectangular screen frame 5 attached to the building opening. It is something.

In the present invention, the act of winding up the screen 3 with the winding roller 4 to open the building opening is referred to as "opening the screen 3", and the winding up of the screen 3 from the winding roller 4 to open the building opening is referred to as "opening the screen 3". Closing is called "closing screen 3" or "closing screen 3." Therefore, "opening and closing the screen 3" means "opening and closing a building opening with the screen 3."

The screen frame 5 includes a winding box 6 vertically disposed on one end side in the left-right direction of the building opening, and a winding box 6 extending from the upper and lower ends of the winding box 6 along the upper and lower sides of the building opening. It has an upper horizontal frame rod 7 and a lower horizontal frame rod 8 that extend horizontally, respectively, and a vertical frame rod 9 that is vertically disposed on the other end side in the left-right direction of the building opening.

The screen winding unit 2 includes the screen 3 and the cylindrical winding roller 4 that winds up and unwinds the screen 3. A first roller shaft 4a having a cylindrical shape with a smaller diameter than the take-up roller 4 is attached to the upper end of the take-up roller 4 coaxially with the take-up roller 4, and A second roller shaft 4b having a cylindrical shape with a smaller diameter than the winding roller 4 is attached coaxially with the winding roller 4, and bearings 13 as rolling bearings are mounted on the first roller shaft 4a and the second roller shaft 4b, respectively. The winding roller 4 is rotatably and removably supported inside the winding box 6 via the bearing 13.

As shown in FIG. 6, the bearing 13 includes an annular inner ring 13a and an outer ring 13b arranged concentrically, and a plurality of rolling elements such as balls or rollers interposed between the inner ring 13a and the outer ring 13b. 13c, by press-fitting the ends of the first roller shaft 4a and the second roller shaft 4b of the take-up roller 4 into the inner ring 13a, the take-up roller 4 The bearings 13 are attached to both upper and lower ends of the bearing 13, respectively.

The bearing 13 attached to the first roller shaft 4a is attached to a first bracket 11 provided at one end (upper end) in the longitudinal direction (vertical direction) of the winding box 6 via a bearing receiver 24 and a bearing presser 25. The bearing 13 supported by the second roller shaft 4b is attached to the second bracket 12 provided at the other end (lower end) of the winding box 6 in the longitudinal direction (vertical direction). It is supported via a bearing receiver 24 and a bearing retainer 25 similar to the bearing retainer 24 and bearing retainer 25 attached to the bearing retainer 11.

As is clear from FIGS. 3 and 4, the bearing receiver 24 is made of a semicircular member and has a semicircular contact surface 24a against which the outer peripheral surface of the outer ring 13b of the bearing 13 comes into contact. The first bracket 11 and the second bracket 12 are fixed to mutually facing inner surfaces with mounting screws 27, respectively, and mounting screws 26 for mounting the bearing retainer 25 are screwed onto the mounting surfaces 24b at both ends of the bearing receiver 24. A screw hole 24c is formed for this purpose.

On the other hand, the bearing presser 25 includes a semicircular body portion 25a having a semicircular contact surface 25b against which the outer peripheral surface of the outer ring 13b of the bearing 13 comes into contact, and a mounting portion continuous to both ends of the body portion 25a. 25c, a screw insertion hole 25d is formed in the mounting portion 25c, and with the outer ring 13b of the bearing 13 sandwiched between the bearing holder 25 and the bearing receiver 24, the screw insertion hole 25d is formed in the mounting portion 25c. The bearing retainer 25 is detachably attached to the bearing receiver 24 by screwing the mounting screws 26 inserted through the bearing receivers 25d into screw holes 24c formed in the mounting surfaces 24b at both ends of the bearing receiver 24. By removing the mounting screw 26 and separating the bearing presser 25 from the bearing receiver 24, the winding roller 4, that is, the screen winding unit 2 is removed together with the bearing 13, as shown in FIG. It can be removed from the removal box 6.

Note that since the upper end of the first roller shaft 4a projects upward from the first bracket 11, the winding roller 4 is attached to and detached from the winding box 6 from the first bracket 11. A cutout 11a is formed for inserting and removing the upper end of the first roller shaft 4a.

Returning to FIG. 1, a movable crosspiece 14 for opening and closing operations is connected to the tip of the screen 3. The upper and lower ends of the movable crosspiece 14 fit into guide grooves formed in the upper horizontal frame rod 7 and the lower horizontal frame rod 8 of the screen frame 5, and when the screen 3 is opened and closed, the upper horizontal frame rod 7 and is guided by the lower horizontal frame rod 8.

Further, the upper and lower ends, which are both ends of the screen 3 in the width direction, fit into slits of inner rails (not shown) housed in the upper horizontal frame rod 7 and the lower horizontal frame rod 8, respectively, so that the screen 3 can be opened and closed. A locking member 19 is attached to the upper and lower ends of the clean 3, and this locking member 19 is slidably locked to the inner edge of the slit. As a result, the screen 3 is not only smoothly guided along the upper horizontal frame rods 7 and lower horizontal frame rods 8 when opening and closing, but also bends due to wind pressure and the like, so that the upper and lower ends are aligned with the upper horizontal frame rods. 7 and the lower horizontal frame rod 8 is prevented.

As the locking member 19, for example, one of a pair of locking teeth of a slide fastener that meshes with each other can be used, but even if it is other than the locking tooth, it may be attached to the inner edge of the slit. Any type of material may be used as long as it can slide along the inner edge in a locked state. A similar locking member 19 is used to connect the screen 3 and the movable crosspiece 14, and the tip of the screen 3 is inserted into a slit formed vertically in the movable crosspiece 14, and the tip The screen 3 and the movable crosspiece 14 are connected by a locking member 19 attached to the inner edge of the slit.

Note that the winding box 6 has a cover attached to the front surface of the winding box 6 so as to be openable and closable or separable by means of a mounting member such as a hinge or screw, and usually the front surface of the winding box 6 is covered with the cover. Although the cover is configured to be opened during maintenance or when the screen winding unit 2 is attached or detached, illustration of the cover is omitted.

As shown in FIG. 5, inside the first roller shaft 4a provided at the upper end of the winding roller 4, there is a drum shaft 29 in the shape of a round bar, which is rotatable coaxially with the winding roller 4. It is accommodated as such.

The upper end of the drum shaft 29 projects upward from the upper end of the first roller shaft 4a and extends to the inside of the upper horizontal frame rod 7. A drum 40 is attached, and the base end of a wire 30 connecting the winding drum 40 and the movable crosspiece 14 is connected to the winding drum 40. When the screen 3 is opened and closed, the wire 30 is connected to the winding drum 40. It is configured to be wound onto a drum 40 or unwound from the winding drum 40. More specifically, when the screen 3 is unwound from the take-up roller 4 to close a building opening, the wire 30 is taken up by the take-up drum 40, and the screen 3 is taken up by the take-up roller 4. The wire 30 is unwound from the winding drum 40 when the building opening is opened.

As shown in detail in FIGS. 7 to 10, the winding drum 40 includes a hollow drum body 41 in the shape of a truncated cone having a large diameter portion 41a and a small diameter portion 41b, and an interior of the drum body 41 arranged concentrically. It has a cylindrical attachment part 42 extending in the cylindrical shape, and a plurality of reinforcing ribs 43 provided radially between the outer surface of the attachment part 42 and the inner surface of the drum body 41, By inserting the upper end of the drum shaft 29 into the drum shaft 29 and fixing it with a locking fitting 44 such as a screw or pin, the winding drum 40 is attached to the drum shaft 29 with the large diameter portion 41a facing downward and the small diameter portion It is coaxially attached with 41b facing upward.

The large diameter portion 41a of the winding drum 40 is the beginning end when winding the wire 30, and the small diameter portion 41b is the end end when winding the wire 30. A fitting groove 45 into which the wound wire 30 is fitted is formed on the outer peripheral surface of the winding drum 40 so as to spirally connect the large diameter part 41a and the small diameter part 41b, The wire 30 is configured to be wound spirally along this fitting groove 45. A flange portion 41c for preventing the wire 30 from coming off the winding drum 40 is formed on the small diameter portion 41b. It is set to be the end.

The groove shape of the fitting groove 45 is arcuate as shown in FIG. , the width w1 of the partition wall 47 separating the vertically adjacent fitting grooves 45, 45, which is larger than the radius of curvature r of the circular arc, is smaller than the groove width w2 of the fitting groove 45.

Here, as schematically shown in FIG. 11, the rotation direction a when the winding roller 4 winds up the screen 3 and the rotation direction b when the winding drum 40 winds up the wire 30 are , are mutually opposite directions, and in this embodiment, the rotation direction a when the winding roller 4 winds up the screen 3 is set clockwise, and when the winding drum 40 winds up the wire 30, the rotation direction a is set clockwise. The rotation direction b is set counterclockwise. However, the opposite may be true.

Further, the length of the screen 3 and the length of the wire 30 are defined as the length of the wire 30 when the screen 3 is fully opened (see FIG. 11), that is, when the screen 3 is completely wound up by the take-up roller 4. When a single wire portion 30A (described later) of 30 is completely unwound from the winding drum 40 and the screen 3 is fully closed (see FIG. 13), that is, when the screen 3 is completely unwound from the winding roller 4, The single wire portion 30A of the wire 30 is connected to the winding drum 40 so as to be completely wound thereon.

Furthermore, the diameter d1 of the winding drum 40 at the winding start end position is the winding diameter of the screen 3 when the winding roller 4 winds up the screen 3 and fully opens it, as shown in FIG. D1, and the position of the winding end of the winding drum 40, that is, the diameter d2 of the small diameter portion 41b is set to be almost the same as the outer diameter D2 of the winding roller 4.

Further, as shown in FIG. 7, the large diameter portion 41a of the winding drum 40 is provided with a wire locking hole 46 for locking the base end of the wire 30 as a winding start end. A plurality of wire locking holes 46 are provided at different positions on the matching groove 45, and by selectively using the plurality of wire locking holes 46, the position of the winding start end of the wire 30 can be changed. In the illustrated embodiment, the wire locking hole 46 is located at a position P1 at the end of the fitting groove 45, and at a position P2 advanced three pitches from the end along the spiral of the fitting groove 45. They are provided in a total of four locations: position P3, which is three pitches further forward, and position P4, which is three pitches further advanced, so that when using screens of various lengths, they can be adjusted according to the length. The position of the winding start end, that is, the winding length of the wire 30 by the winding drum 40 can be changed in four stages.

As shown in FIG. 1, the wire 30 has a single wire portion 30A on the proximal side of the branch portion 31 and a double wire portion 30B on the distal side of the branch portion 31, and the single wire portion 30A has one wire 30a. The double wire portion 30B branches into two wires 30b and 30c. The single wire portion 30A is a portion that is wound around the winding drum 40 or unwound from the winding drum 40 when the screen 3 is opened and closed.On the other hand, the two wires 30b and 30c in the double wire portion 30B is passed around a plurality of guide pulleys 33a, 33b, and 33c provided in the screen frame 5, and then the tip of one wire 30b is connected to the movable crosspiece 14 from the guide pulley 33b at the upper end of the vertical frame rod 9. The tip of the other wire 30c is connected to the lower end of the movable crosspiece 14 from the guide pulley 33c at the lower end of the vertical frame rod 9.

Returning to FIG. 5, the lower end of the drum shaft 29 protrudes into the take-up roller 4 from the lower end of the first roller shaft 4a, and surrounds the drum shaft 29 inside the take-up roller 4. One end (lower end) 34a of the coil spring 34 is engaged with the drum shaft 29, and the other end (upper end) 34b of the coil spring 34 is engaged with the first roller shaft 4a. It has stopped.

An initial twist is applied to the coil spring 34 in advance by increasing the number of windings, and this initial twist causes the take-up roller 4 and the drum shaft 29 to have a direction in which the coil spring 34 attempts to unwind. The urging force (rotational force) of is always acting. The direction of action of the biasing force is opposite to each other on the winding roller 4 and the drum shaft 29, and as shown in FIG. In the drum shaft 29, the winding drum 40 winds the wire 30 in the direction b, that is, counterclockwise. As a result, the screen 3 and the wire 30 are always under tension, so that malfunctions due to loosening do not occur.

As a method of applying an initial twist to the coil spring 34, before the screen winding unit 2 is attached to the winding box 6, the winding roller 4 and the drum shaft 29 are relatively rotated. An initial twist is applied to the spring 34, and in this state, the drum shaft 29 and the first roller shaft 4a are fixed so that they cannot rotate relative to each other with a locking fitting 35 such as a snap pin. After the screen winding unit 2 is attached to the winding box 6, the locking metal fittings 35 may be removed.

Next, the operation of the screen device 1 will be explained. 11 to 13 show the screen device 1 in a planar state in which the take-up roller 4 and the take-up drum 40, which are provided coaxially, are separated from each other and the number of turns of the coil spring 34 is reduced. 11 shows the screen 3 in a fully open state, FIG. 12 shows the screen 3 in a half-open state, and FIG. 13 shows the screen 3 in a fully closed state.

In the screen device 1, when the screen 3 is fully opened as shown in FIG. 11, a rotational force in the direction of arrow a is applied to the take-up roller 4 by the coil spring 34 to which an initial twist is applied. A rotational force in the direction of arrow b is acting on the drum shaft 29, that is, the winding drum 40. From this state, when the movable crosspiece 14 is moved to the left in the figure (in the direction of arrow m) and the screen 3 is let out from the take-up roller 4, the take-up roller 4 rotates in the direction of arrow b, so that the coil spring 34 is twisted, and the drum shaft 29 and the winding drum 40 rotate in the direction of arrow b due to the biasing force. Therefore, as shown in FIGS. 12 and 13, the winding drum 40 carries the wire 30 of a length corresponding to the amount of movement of the movable crosspiece 14 (the amount of payout of the screen 3). It is wound up spirally along the fitting groove 45 from the large diameter end 30a side toward the small diameter end 30b side.

At this time, the rotation of the take-up roller 4 and drum shaft 29 (take-up drum 40) caused by the diameter difference between the winding diameter of the screen 3 by the wind-up roller 4 and the winding diameter of the wire 30 by the wind-up drum 40 Due to the difference, the number of twists (number of turns) of the coil spring 34 may increase or decrease slightly, but the winding diameter of the screen 3 by the winding roller 4 and the winding diameter of the wire 30 by the winding drum 40 are proportional to each other. The number of windings of the coil spring 34 is set to vary significantly, and the relationship is such that there is no large difference between the two no matter how the screen 3 is opened or closed. Therefore, the operating force when extending the screen 3 from the fully open position in FIG. 7 to the half-open position in FIG. 12 to the fully closed position in FIG. 13 is averaged and does not change significantly. Further, the screen 3 can also be stopped at the half-open position shown in FIG. 12.
Therefore, the drum shaft 29 and the coil spring 34, the winding drum 40 and the wire 30 constitute an operating force adjustment mechanism when the movable crosspiece 14 opens and closes the screen 3.

As described above, in the present invention, by providing the spiral fitting groove 45 on the outer peripheral surface of the winding drum 40 having a truncated conical shape, the wire 30 is prevented from being wound over or entangled. Not only can the wire 30 be wound in an orderly spiral along the fitting groove 45, but also the winding diameter of the wire 30 on the winding drum 40 can be controlled by adjusting the winding diameter of the wire 30 on the winding roller 4 when the screen 3 is opened and closed. It can be changed to correspond to changes in the winding diameter.

Next, in order to move the screen 3 from the fully closed position in FIG. 13 to the half open position in FIG. 12 to the fully open position in FIG. When winding up the screen 3 onto the winding roller 4, the wire 30 is pulled out from the winding drum 40, the winding drum 40 and drum shaft 29 rotate in the direction of arrow a, and the coil spring 34 is twisted. Therefore, the urging force causes the winding roller 4 to rotate in the direction of arrow a and wind up the screen 3. At this time, even if the number of twists of the coil spring 34 may slightly increase or decrease due to the rotation difference between the take-up drum 40 and the take-up roller 4, the number of twists of the coil spring 34 will largely increase or decrease as described above. Therefore, the operating force required to open the screen 3 is averaged and does not vary greatly.

In the embodiment described above, the winding drum 40 is attached to the drum shaft 29 with the large diameter portion 41a facing downward and the small diameter portion 41b facing upward; It is also possible to attach it to the drum shaft 29 with the small diameter portion 41b facing downward.
Further, the screen device 1 is a horizontally opening type screen device that opens and closes a building opening by moving the screen 3 horizontally, but the present invention is a vertically opening type screen device that opens and closes a building opening by moving the screen 3 up and down. It can also be applied to an opening type screen device. In this case, the winding box 6 is disposed at the upper end or the lower end of the building opening, and the winding roller 4 is rotatable about a horizontal axis via a bearing 13 inside the winding box 6. It can be installed like this.

1 Screen device 3 Screen 4 Take-up roller 6 Take-up box 11 First bracket 12 Second bracket 13 Bearing 14 Movable crosspiece 19 Locking member 24 Bearing receiver 25 Bearing holder 29 Drum shaft 30 Wire 30A Single wire portion 30B Double wire portion 30a Single wire portion wire 30b One wire of the double-track section 30c The other wire of the double-track section 34 Coil spring 40 Winding drum 41a Large diameter section 41b Small diameter section 41c Flange section 45 Fitting groove 46 Wire locking hole d1 Winding start end of the winding drum d2 Diameter of the small diameter part (winding end) of the winding drum D1 Winding diameter of the screen D2 Diameter of the winding roller h Depth of the fitting groove r Radius of curvature of the arc w1 Width of the partition wall w2 Groove width

Claims (7)

a screen for opening and closing a building opening; a winding box disposed at one end of the building opening; and a winding box rotatably and detachably supported inside the winding box; A take-up roller for winding up and unwinding the screen, a movable crosspiece for opening and closing operations attached to the tip of the screen, and an operation for adjusting the operating force when opening and closing the curtain using the movable crosspiece. It has a force adjustment mechanism,
The operating force adjustment mechanism includes a drum shaft disposed coaxially with the winding roller and rotatable relative to the winding roller, and a winding drum attached to one end of the drum shaft. a drum, a wire whose base end is connected to the winding drum and is run around inside the building opening, and whose tip end is connected to the movable crosspiece from the other end side of the building opening; and the inside of the winding roller. The winding roller is arranged at one end and the other end is connected to the winding roller and the drum shaft, and is twisted by relative rotation between the winding roller and the drum shaft to accumulate a biasing force, and the accumulated biasing force is used to connect the winding roller to the drum shaft. A screen device including a coil spring that applies a rotational force to a roller and a drum shaft in a direction to wind up the screen and wire,
The winding drum has a truncated conical shape, and has a large diameter part that becomes a winding start end when winding the wire, and a small diameter part that becomes a winding end end when winding the wire, A fitting groove into which the wound wire is fitted is formed on the outer periphery of the winding drum so as to spirally connect the large diameter part and the small diameter part.
A screen device characterized by: The fitting groove has an arc shape, the depth of the fitting groove is larger than the curvature deformation of the arc, and the width of the partition separating adjacent fitting grooves is smaller than the groove width of the fitting groove. The screen device according to claim 1, characterized in that: The diameter of the portion of the large-diameter portion of the winding drum that becomes the winding start end is equal to the winding diameter of the screen when the winding roller winds up the screen and fully opens the screen. 3. The screen device according to claim 1, wherein the diameter of the small diameter portion of the winding end is equal to the diameter of the winding roller. A plurality of wire locking holes are formed in the large diameter portion of the winding drum at different positions on the fitting groove for locking the base end of the wire to become a winding start end, and the plurality of wire locking holes are formed at different positions on the fitting groove. 3. The screen device according to claim 1, wherein the position of the winding start end can be changed by selectively using the wire locking hole. The wire is composed of a single wire portion having one wire and a double wire portion branching into two wires, and the single wire portion is wound around the winding drum when the screen is opened and closed. The tip of one of the two wires in the double track section is connected to one end in the length direction of the movable bar, and the tip of the other wire is connected to the length of the movable bar. The screen device according to claim 1 or 2, wherein the screen device is connected to the other end in the width direction. Bearings are attached to one end and the other end of the winding roller in the axial direction, respectively, and the brackets provided at both ends of the winding box in the longitudinal direction include a bearing receiver and a bearing retainer that is detachably attached to the bearing receiver. and the winding roller is rotatably and detachably supported inside the winding box by sandwiching the bearing between the bearing receiver and the bearing presser. The screen device according to claim 1 or 2. The screen device according to claim 1 or 2, wherein locking members are attached to both ends of the screen in the width direction to slidably lock onto a screen frame that guides the both ends. .

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