JP2015117500A - Shading curtain lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shading curtain lifting device for preventing a shade from descending by dead weight because a motor cannot support weight of the shade when stopping the motor.SOLUTION: An electrically-driven roman shade device pulls up the shade to which a cord 4 is fixed, by winding the cord 4 attached on winding drums 5A and 5B on the winding drums 5A and 5B by rotating the winding drums 5A and 5B. A winding surface of each of the winding drums 5A and 5B has an elliptical cross-sectional shape in a cross-sectional view. When short diameter parts 54 of the winding drums 5A and 5b are positioned above and below a rotary shaft 71a, a torque applied to the motor becomes larger than resting holding force of the motor, and the winding drums 5A and 5B rotate in the feeding direction. When the winding drums 5A and 5B rotate until the short diameter parts 54 of the winding drums 5A and 5B are positioned on the left and right of the rotary shaft 71a, the torque applied to the motor becomes smaller than the resting holding force of the motor, and rotation of the winding drums 5A and 5B stops.

Description

  The present invention relates to a light-shielding curtain lifting device.

  Conventionally, as a light-shielding curtain elevating device, a screen device shown in Patent Document 1 below is disclosed. The light-shielding curtain elevating device of Patent Document 1 winds a string attached to a pipe by rotating the pipe with a motor. As the string is wound around the pipe, the shade to which the string is fixed is pulled up.

JP 2011-247054 A

  In the conventional light-shielding curtain lifting device, the stopped motor cannot support the weight of the shade and rotates in the direction opposite to the winding direction of the string, and the shade may fall by its own weight.

  The present invention has been made in view of such a problem, and an object thereof is to provide a light-shielding curtain lifting device that can solve the above-described problems.

In order to achieve such an object, the light-shielding curtain elevating device of the present invention winds a string attached to the winding material by rotating the winding material with the elevating device, and the string is fixed. The light-shielding curtain lifting device that winds up the lifted body, wherein the winding material has a short diameter portion in a cross-sectional view.
Further, the present invention is characterized in that the winding material includes a pair of the short diameter portions at positions facing each other with the rotation shaft interposed therebetween.
In the present invention, the winding surface of the winding material has an elliptical cross-sectional shape.
In the present invention, the winding surface of the winding material has a rectangular cross-sectional shape.
Further, the present invention is characterized in that the rotating shaft of the winding material is formed of a bolt and is screwed into a nut attached to the head rail.
Further, the present invention is characterized in that a plurality of the winding materials are connected while shifting the position of the short diameter portion with respect to the circumferential direction of the rotating shaft.
Further, the present invention is characterized in that the nuts are screwed to the rotating shafts positioned between the winding materials.

  According to the present invention, the stationary holding force of the lifting device can be increased at the end diameter portion by providing the winding material with the short diameter portion in a cross-sectional view. For this reason, it is possible to prevent the lifted body from being lowered by its own weight without stopping the weight of the lifted body.

It is a figure which shows the electric Roman shade apparatus of one Embodiment of this invention. It is a figure which shows the winding drum with which the electric roman shade apparatus of FIG. 1 is provided. It is a figure which shows the operation | movement at the time of the cord winding of the winding drum of FIG. It is a figure which shows the operation | movement at the time of the motor stop of the winding drum of FIG. It is a figure which shows the modification of an electric Roman shade apparatus. It is a figure which shows the operation | movement at the time of the cord winding of the winding drum of the 1st modification of this invention. It is a figure which shows the operation | movement at the time of the motor stop of the winding drum of FIG. It is a 1st figure which shows the winding drum of the other modification of this invention. It is a 2nd figure which shows the winding drum of the other modification of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of an electric roman shade device 1 according to the present embodiment from the front in a state where the electric roman shade device 1 is attached to a wall.

  As shown in FIG. 1, the electric roman shade device 1 includes a shade 2 that is a body to be lifted, a lifting device 3 that lifts and lowers the shade 2, and a head rail 8 that supports the lifting device 3 on a wall or a ceiling. Yes.

  The lifting device 3 includes a cord 4 that suspends the shade 2, winding drums 5A and 5B around which the cord 4 is wound, and a driving device 7 that rotates the winding drums 5A and 5B.

  FIG. 2 is a view showing the winding drums 5A and 5B provided in the electric roman shade device 1. As shown in FIG.

  As shown in FIG. 2, the winding drums 5A and 5B are pipes made of an aluminum alloy, and are formed from a cylindrical rectangular tube 5a having a rectangular cross-sectional shape and four corners of the rectangular tube 5a. It is formed by an arc plate 5b that is curved and extended in an arc shape along the outer peripheral surface of the cylindrical body 5a. The four circular arc plates 5b are arranged at a predetermined interval, and constitute an elliptical annular cylinder 5c.

  A single attachment 51 for attaching the cord 4 is provided between the circular arc plates 5b on the winding drum 5A. The winding drum 5B is provided with three fixtures 51 positioned between the circular arc plates 5b. Each fixture 51 is disposed between the circular arc plate 5b and the rectangular tube body 5a, and movement of the winding drums 5A and 5B to the outside is restricted by the circular arc plate 5b.

  As shown in FIG. 1, the cord 4 whose upper end is fixed to the fixture 51 is sequentially inserted from the insertion piece 22 on the upper end side of the shade 2 described above, and the lower end portion is fixed to the insertion piece 22 positioned at the lowest end. Has been.

  As shown by an arrow in FIG. 1, the end of the left end of the winding drum 5A is slidable along the axial direction by a slide shaft 74 attached to a rotating shaft 71a of a motor 71 described later. Supported by A limit bolt 53 is fixed to the end of the rectangular tube 5a at the right end of the winding drum 5A. The limit bolt 53 is supported by the head rail 8 by screwing into a limit nut 91 of the bracket 9 described later. A limit bolt 53 is fixed to the end portion of the rectangular tube 5a at the left end of the winding drum 5B. The end portion of the rectangular tube 5a at the right end of the winding drum 5B is supported slidably along the axial direction by a slide shaft 61 attached to an end bearing 6 described later.

  A magnet 81 is attached to the right end of the winding drum 5A. The magnet 81 is detected by the reed switch 92 when the winding drums 5A and 5B move to the rightward movement limit when the shade 2 is pulled up to the upper limit position.

  The drive device 7 includes a motor 71, a drive control unit 72, and a power cable 73 that supplies power to the motor 71 and the drive control unit 72. The motor 71 is fixed to the head rail 8 with a bracket (not shown). As shown in FIG. 1, a slide shaft 74 is attached to the rotating shaft 71 a of the motor 71.

  As shown in FIG. 1, a rotation stopper 75 is attached to the tip of the slide shaft 74. The rotation stopper 75 is for rotating the slide shaft 74 integrally with the take-up drum 5A, and is composed of a resin block body having a cross-sectional shape substantially equal to the inner diameter of the rectangular tube 5a. The rotation stopper 75 restricts the rotation of the slide shaft 74 relative to the winding drum 5A by being fitted to the end of the left cylindrical tube 5a of the winding drum 5A.

  Further, as shown in FIG. 1, a resin bearing 76 is attached to the slide shaft 74 so as to be movable along the axial direction of the slide shaft 74. A fitting piece 77 is pivotally supported on the resin bearing 76. The fitting piece 77 is fitted between the rectangular tube 5a at the left end of the winding drum 5A and the circular arc plate 5b, so that the slide shaft 74 can move in the axial direction relative to the winding drum 5A. Fix it.

  The drive control unit 72 acquires a user instruction via a remote controller (not shown), and leads out the cord 4 from the winding drums 5A and 5B or winds up the winding drum 5A and 5B. The motor 71 is rotated. Further, the drive control unit 72 stops the rotation of the motor 71 in the winding direction when detecting the detection signal of the magnet 81 by the reed switch 92, and stops the rotation of the motor 71 after a predetermined number of rotations in the lead-out direction from this stop position. To do.

  A hook-and-loop fastener (not shown) is attached to the front surface from the left end to the right end of the head rail 8. A pair of hook-and-loop fasteners (not shown) attached to the upper edge of the shade 2 are attached to the hook-and-loop fastener. A weight bar (not shown) for tensioning the shade 2 is attached to the lower edge portion of the shade 2 fixed to the head rail 8 with a hook-and-loop fastener. Further, as shown in FIG. 1, the insertion pieces 22 described above are attached to one surface of the shade 2 so as to be arranged in four rows from the upper end side to the lower end side at substantially equal intervals on the left and right sides.

  As shown in FIG. 1, a bracket 9 and an end bearing 6 are attached to the head rail 8. A limit nut 91 is welded to the bracket 9. A limit bolt 53 fixed to the winding drums 5A and 5B is screwed into the limit nut 91. A reed switch 92 is attached to the bracket 9. The reed switch 92 is for detecting the magnet 81 attached to the winding drum 5A.

  As shown in FIG. 1, a slide shaft 61 is welded to the end bearing 6. A resin bearing 62 is attached to the slide shaft 61 so as to be movable along the axial direction of the slide shaft 61. A fitting piece 63 is pivotally supported on the resin bearing 62. The fitting piece 63 is fixed between the winding drum 5B and the slide shaft 61 so as to be movable in the axial direction by being fitted between the rectangular tube 5a at the left end of the winding drum 5B and the circular arc plate. To do.

  The operation of the electric roman shade device 1 having the above configuration will be described mainly with reference to FIGS. 3 and 4.

  FIG. 3 is a cross-sectional view of the winding drums 5A and 5B as viewed from the left side. FIG. 3A shows the winding drums 5A, 5B and (b) which are in the leftward movement limit with the shade 2 lowered to the lower limit position. The winding drums 5A and 5B are shown for pulling up from the lower limit position.

  The winding drum 5A in which the cord 4 is led out until the shade 2 is lowered to the lower limit position, as shown in FIG. 1, supports the left end portion of the rectangular tube 5a by the slide shaft 74 attached to the rotating shaft 71a of the motor 71. At the same time, the limit bolt 53 screwed into the limit nut 91 of the bracket 9 is supported by the right end portion of the rectangular tube 5a and is positioned at the right side movement limit. Further, the winding drum 5B is supported at the right end portion of the rectangular tube 5a by a slide shaft 61 attached to the end bearing 6, and at the limit tube 53 screwed to the limit nut 91 of the bracket 9, the rectangular tube 5a. Is supported at the left end, and is located at the right side movement limit.

  As a result, the winding drums 5A and 5B are movable in the left and right and rotational directions by screwing the limit nut 91 and the limit bolt 53 in a state where the winding drums 5A and 5B are positioned in the vertical and longitudinal directions. The magnet 81 attached to the winding drum 5 </ b> A is located off the right side of the detection range by the reed switch 92.

  In this state, when the user operates a remote controller (not shown) to give an instruction to pull up the shade 2, the drive control unit 72 that has received a signal to that effect rotates the motor 71 in the winding direction. Then, the slide shaft 74 attached to the rotation shaft 71a of the motor 71 rotates integrally with the rotation shaft 71a, and rotates the winding drums 5A and 5B integrated with the slide shaft 74 in the rotation direction in the winding direction. Let

  The winding drums 5A and 5B have a state in which the short diameter portion 54 is positioned on the left and right of the rotating shaft 71a as shown in FIG. 3A and the upper and lower sides of the rotating shaft 71a as shown in FIG. 3B. Rotate by repeating the position. At this time, as shown in FIG. 3A, when the short diameter portions 54 of the winding drums 5A and 5B are located on the left and right of the rotating shaft 71a, from the rotating shaft 71a to the winding surface of the cord 4. Therefore, the load applied to the motor 71 can be small. On the other hand, as shown in FIG. 3B, when the short diameter portions 54 of the winding drums 5A and 5B are positioned above and below the rotating shaft 71a, the winding surface of the cord 4 from the rotating shaft 71a. Since the distance to the motor 71 is long, the load applied to the motor 71 increases.

  As the winding drums 5A and 5B rotate, the limit bolt 53 is screwed with the limit nut 91. As a result, the winding drums 5A and 5B move to the right with respect to the slide shafts 61 and 74 that support the ends of the rectangular tube 5a so as to be slidable in the axial direction while rotating in the winding direction. That is, the winding drums 5A and 5B rotate in the winding direction together with the slide shafts 61 and 74 by the torque applied from the slide shaft 74, and the screw operation of the limit nut 91 and the limit bolt 53 accompanying this rotation. Move from left to right.

  The cord 4 whose upper end is fixed to the mounting tool 51 of the winding drums 5A and 5B, as the winding drums 5A and 5B rotate, as shown by arrows in FIGS. 3 (a) and 3 (b). 5A and 5B are wound up from the upper end side. While the suspension position of the shade 2 by the cord 4 is maintained at the suspension position from the head rail 8, the winding drums 5 </ b> A and 5 </ b> B that wind and rotate the cord 4 include a limit nut 91 and a limit bolt 53. Move to the right side with the screw movement.

  For this reason, the winding position of the cord 4 on the outer peripheral surfaces of the winding drums 5 </ b> A and 5 </ b> B moves while maintaining a distance equal to the moving distance of the limit bolt 53 relative to the limit nut 91. That is, the winding position of the cord 4 on the outer peripheral surfaces of the winding drums 5 </ b> A and 5 </ b> B moves at the same interval as the pitch of the thread formed on the limit nut 91 and the limit bolt 53.

  As the cord 4 is wound around the winding drums 5 </ b> A and 5 </ b> B, the shade 2 suspended from the cord 4 is pulled up at the same speed as the winding speed of the cord 4. When the shade 2 is pulled up to the upper limit position, the magnet 81 enters the detection range of the reed switch 92. As a result, the current supply by the drive control unit 72 is stopped, and the rotation of the motor 71 is stopped.

  The winding drums 5A and 5B that have wound the cord 4 until the shade 2 is pulled up to the upper limit position are wound around the outer circumference of the four cords 4 from the right side to the left side in a spiral shape, and the slide shafts 61 and 74 are used as square tubes. The end of the body 5a is supported and moved to the right side movement limit.

  In this state, when the user operates the remote controller to give an instruction to lower the shade 2, the drive control unit 72 that has received a signal to that effect rotates the motor 71 in the lead-out direction. As a result, the winding drums 5A and 5B rotate together with the slide shaft 74 in the lead-out direction, and move to the left by the screw operation of the limit bolt 53 and the limit nut 91.

  The cord 4 fixed to the winding drums 5A and 5B is led out from the lower end side with the rotation of the winding drums 5A and 5B. While the suspension position of the shade 2 by the cord 4 is maintained at the suspension position from the head rail 8, the winding drums 5A and 5B are moved to the left by the screw operation of the limit nut 91 and the female screw hole 53a. Move to. For this reason, the lead-out position of the cord 4 on the outer peripheral surfaces of the winding drums 5A and 5B moves at the same interval as the pitch of the screw thread formed in the limit nut 91 and the female screw hole 53a.

  When the shade 2 is lowered to the lower limit position and the winding drums 5A and 5B move to the leftward movement limit, the rotation speed of the motor 71 reaches a predetermined number. As a result, the current supply by the drive control unit 72 is stopped, and the rotation of the motor 71 is stopped.

  In a state where the shade 2 is pulled up to the upper limit position and the rotation of the motor 71 is stopped, torque is applied to the rotating shaft 71 a of the motor 71 by the weight of the shade 2. When this torque exceeds the stationary holding force of the motor 71, the winding drums 5A and 5B rotate in the lead-out direction together with the rotating shaft 71a of the motor 71, and the shade 2 is lowered.

  However, in the present embodiment, the winding surfaces of the winding drums 5A and 5B have an elliptical cross-sectional shape, and a pair of short diameter portions 54 are provided at positions facing each other with the rotating shaft 71a interposed therebetween. Therefore, when the cord 4 is suspended from the winding surface of the short diameter portion 54, the torque applied to the rotating shaft 71a of the motor 71 is smaller than when the cord 4 is suspended from another winding surface.

  That is, as shown in FIG. 3A, when the short diameter portions 54 of the winding drums 5A and 5B are positioned above and below the rotating shaft 71a, the rotating shaft 71a extends to the winding surface of the cord 4. Since the distance is long, the torque applied to the motor 71 increases. On the other hand, as shown in FIG. 3B, when the short diameter portions 54 of the winding drums 5A and 5B are located on the left and right of the rotating shaft 71a, the winding surface of the cord 4 from the rotating shaft 71a. Therefore, the torque applied to the motor 71 can be small.

  For this reason, when suspended from the winding surface of the short diameter portion 54, the motor applied from the winding surface of the short diameter portion 54 so that the torque applied to the rotating shaft 71 a of the motor 71 becomes smaller than the stationary holding force of the motor 71. By setting the distance of 71 to the rotating shaft 71 a, the rotation of the motor 71 in the direction in which the rotating shaft 71 a is derived can be stopped by the stationary holding force of the motor 71.

  As a result, when the cord 4 is suspended from another winding surface, the cord 4 rotates in the lead-out direction of the motor 71 and cannot be stopped by the stationary holding force of the motor 71. When the motor 71 is rotated in the direction in which the motor 71 is led out until it is suspended, the motor 71 can be stopped by the stationary holding force.

  That is, as shown in FIG. 4A, when the short diameter portions 54 of the winding drums 5A and 5B are positioned above and below the rotation shaft 71a, the torque applied to the motor 71 is the static holding force of the motor 71. The winding drums 5A and 5B rotate in the lead-out direction. Thereafter, as shown in FIG. 4B, when the winding drums 5A and 5B rotate until the short diameter portions 54 of the winding drums 5A and 5B are positioned on the left and right of the rotation shaft 71a, the torque applied to the motor 71 is increased. It becomes smaller than the stationary holding force of the motor 71, and the rotation of the winding drums 5A and 5B stops. For this reason, it is possible to prevent the shade 2 from being lowered by its own weight.

  According to the present embodiment, the winding drums 5A and 5B to which the cord 4 that winds up the shade 2 is attached are provided with the short-diameter portion 54 that has a short distance from the rotary shaft 71a to the winding surface of the cord 4, When the cord 4 is suspended from the winding surface of the short diameter portion 54, the torque applied to the rotating shaft 71 a of the motor 71 can be made smaller than the stationary holding force of the motor 71. As a result, the stopped motor 71 can be prevented from rotating in the direction opposite to the winding direction without being able to support the weight of the shade 2 by the stationary holding force, and the shade 2 can be prevented from descending by its own weight.

  In the above embodiment, the case where the electric roman shade device 1 is configured by using the two winding drums 5A and 5B has been described. However, the electric roman shade device 1 may be configured using one winding drum, or the electric roman shade device 1 may be configured by connecting three or more winding drums. Further, like the electric roman shade device 1 shown in FIG. 5, a plurality of winding drums 5A, 5B, 5C, and 5D are connected by shifting the position of the short diameter portion 54 with respect to the circumferential direction of the rotating shaft 71a. It is good.

  In the electric roman shade device 1 shown in FIG. 5, the winding drums 5A, 5B are connected to each other by a limit bolt 53, and the winding drums 5B, 5C, 5D are connected to each other by a slide shaft 12, and the winding drum 5A, 5B, 5C, and 5D rotate together. A bracket 10 for supporting the slide shaft 12 is attached to the head rail 8. The bracket 10 is provided with a resin bearing 11 that supports the slide shaft 12 movably along the axial direction.

  According to this configuration, the winding drums 5A and 5B are connected to the winding drums 5C and 5D by shifting the position of the short diameter portion 54 with respect to the circumferential direction of the rotation shaft 71a. The rotational position at which the maximum torque is applied between the winding drums 5A and 5B that have been shifted can also be shifted. For this reason, when the shade 2 is wound up, the maximum torque applied to the motor 71 can also be kept small. Further, since the take-up drums 5A and 5B are supported by the limit bolt 53 and the slide shaft 12 positioned between the take-up drums 5A and 5B, the rotational torque due to the bending of the take-up drums 5A, 5B, 5C and 5D is reduced. Loss can be prevented. For this reason, even one wide window can be handled by one electric roman shade device 1.

  Further, the cross-sectional shape of the winding drums 5A and 5B is not limited to that of the above-described embodiment as long as the short-diameter portion 54 having a short distance from the rotating shaft 71a to the winding surface is provided. For example, in the above-described embodiment, the case where the winding surfaces of the winding drums 5A and 5B have an elliptical cross-sectional shape has been described. However, like the winding drum 5I shown in FIGS. The surface may have a rectangular cross-sectional shape. The winding drum 5C has a rectangular tube 5e at the center of a rectangular portion 5d having a rectangular cross-sectional shape.

  Also with this configuration, as shown in FIG. 6A, when the short diameter portion 54 of the winding drum 5I is positioned above and below the rotating shaft 71a, from the rotating shaft 71a to the winding surface of the cord 4. Is longer, the torque applied to the motor 71 becomes larger. On the other hand, as shown in FIG. 6B, when the short diameter portion 54 of the winding drum 5I is positioned on the left and right of the rotating shaft 71a, the rotating shaft 71a extends to the winding surface of the cord 4. Since the distance is short, the torque applied to the motor 71 can be small.

  Further, when the motor 71 is stopped, as shown in FIG. 7A, when the short diameter portion 54 of the winding drum 5I is positioned above and below the rotating shaft 71a, the torque applied to the motor 71 is increased. And the take-up drum 5I rotates in the lead-out direction. Thereafter, as shown in FIG. 7B, when the winding drum 5I rotates until the short diameter portion 54 of the winding drum 5I is positioned on the left and right of the rotating shaft 71a, the torque applied to the motor 71 is held stationary. The force becomes smaller than the force, and the rotation of the winding drum 5I stops. For this reason, it is possible to prevent the shade 2 from being lowered.

  As described above, even in this configuration, the winding surface of the winding drum 5I has a rectangular cross-sectional shape and includes the pair of short diameter portions 54 at positions facing each other with the rotating shaft 71a interposed therebetween. The torque applied to the rotating shaft 71a of the motor 71 can be made smaller when suspended from the winding surface of the short diameter portion 54 than when suspended from another winding surface.

  For this reason, the torque applied to the rotating shaft 71a of the motor 71 when it is suspended from the winding surface of the short diameter portion 54 by setting the distance from the rotating shaft 71a to the winding surface at the short diameter portion 54. Can be made smaller than the static holding force of the motor 71.

  As a result, when the cord 4 is rotated in the direction in which the motor 71 is led out until it is suspended from the winding surface of the short diameter portion 54, the rotation of the winding drum 5I can be stopped by the stationary holding force of the motor 71. It is possible to prevent the take-up drum 5I from rotating together with the rotating shaft 71a in the lead-out direction and the shade 2 from being lowered.

  Moreover, even if it has a rectangular cross-sectional shape that does not include a square tube at the center like the winding drum 5E shown in FIG. 8A, the winding drum 5E like the winding drum 5F shown in FIG. 8B. A wider square cross-sectional shape may be used. Further, it may have a triangular cross-sectional shape as in the winding drum 5G shown in FIG. 9A or an elliptical cross-sectional shape in the winding drum 5H shown in FIG.

  Further, like the above-described take-up drums 5A and 5B, the configuration is not limited to the configuration including the pair of short diameter portions 54 at positions facing each other across the rotation shaft 71a. It is good also as a structure provided with three or more end diameter parts. Further, the rotation shaft 71a is not necessarily positioned at the center of the winding drums 5A and 5B, and may be positioned so as to be shifted from the center of the winding drums 5A and 5B.

  In addition, this invention is not limited to the said embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention. For example, the power for rotating the winding drums 5A and 5B is not limited to the motor 71, and other means may be used, or a support shaft including the slide shaft 74 may be manually rotated. Further, the number of the cords 4 that suspend the shade 2 is also arbitrary. Moreover, although the said embodiment demonstrated the case where a screen was used as the shade 2 raised / lowered by the raising / lowering apparatus 3, the kind of shade 2 is arbitrary and may be a blind.

DESCRIPTION OF SYMBOLS 1 Electric Roman shade apparatus 10 Bracket 11 Resin bearing 12 Slide shaft 2 Shade 22 Insertion piece 3 Lifting apparatus 4 Code 5A, 5B, 5C, 5D, 5E, 5F, 5G, 5H, 5I Winding drum 5a Square cylinder 5b Arc plate 5c Tubular body 5d Rectangular portion 5e Square tubular body 51 Mounting tool 53 Limit bolt 54 Short diameter portion 6 End bearing 61 Slide shaft 62 Resin bearing 63 Fitting piece 7 Drive device 71 Motor 71a Rotating shaft 72 Drive control portion 73 Power cable 74 Slide Shaft 75 Anti-rotation 76 Resin bearing 77 Fitting piece 8 Head rail 81 Magnet 9 Bracket 91 Limit nut 92 Reed switch

Claims (7)

A light-shielding curtain lifting device that winds a string attached to the winding material by rotating the winding material with a lifting device to wind up the lifted body to which the string is fixed,
The winding material is provided with a short-diameter portion in a cross-sectional view.   The light-shielding curtain elevating device according to claim 1, wherein the winding material includes a pair of the short-diameter portions at positions facing each other across the rotation shaft.   The light-shielding curtain elevating device according to claim 1, wherein a winding surface of the winding material has an elliptical cross-sectional shape.   The light-shielding curtain elevating device according to claim 1, wherein the winding surface of the winding material has a rectangular cross-sectional shape. The rotating shaft of the winding material is formed of a bolt,
The light-shielding curtain elevating device according to claim 1, wherein the light-shielding curtain elevating device is screwed into a nut attached to the head rail.   The light-shielding curtain elevating device according to any one of claims 1 to 5, wherein a plurality of the winding materials are connected while shifting the position of the short diameter portion with respect to the circumferential direction of the rotating shaft. The light-shielding curtain elevating device according to claim 6, wherein the nut is screwed to each of the rotating shafts positioned between the winding materials.

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