JP2018109264A - Blind - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blind that mitigates a defect caused by loosening of a wound lifting cord.SOLUTION: A blind 100 has a winding drum 132 for winding a lifting cord 120. The winding drum 132 has, on an edge side, a connecting part 132a to which an end of the lifting cord 120 is connected, a winding start part 132b for the lifting cord 120 at a position toward the other edge side than the connecting part 132a, and a winding surface 132c formed between the winding start part 132b and the connecting part 132a for winding the lifting cord 120. The blind further includes large-diameter parts 134b, 134c on the winding surface 132c close to the connecting part 132a, for absorbing loosening of the lifting cord 120. The configuration mitigates a defect caused by loosening of the wound lifting cord.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a blind provided with a blind winding device.

  Conventionally, as a blind provided with a winding device for blinds, there is one shown in JP 2000-179261 A (Patent Document 1). The blind winding device disclosed in this document connects the lifting / lowering cord end to the small diameter side of a winding pulley having a tapered cross section that is rotatably supported in the head box, thereby moving the lifting / lowering cord from the winding pulley. Support hanging. Then, by rotating the winding pulley, the lifting / lowering cord is spirally wound from the large diameter side to the small diameter side of the winding pulley to pull up the shielding material. Further, by making the take-up pulley rotatable, the lifting / lowering cord is unwound from the take-up pulley by the weight of the shielding material to lower the shielding material. The lifting / lowering cord is wound on the basis of the weight of the shielding material acting on the lifting / lowering cord until the shielding material descends to the lowest limit as the length of unwinding of the winding pulley when the shielding material is lowered to the lowest limit. The pulley can be driven to rotate in the rewinding direction of the lifting / lowering cord.

  According to such a configuration, when the lifting / lowering cord is wound around the winding pulley, the lifting / lowering cord winds the lifting / lowering cord from the large diameter side of the pulley. When the shield is lifted while winding the lifting / lowering cord so that the winding portion is pushed out toward the small-diameter side having the lifting / lowering cord connecting portion, and the lifting / lowering cord is rewound from the winding pulley, the lifting / lowering cord becomes the large diameter of the pulley. It is rewound in order from the winding portion wound on the side toward the small diameter side. Even when the shielding material reaches the lower limit position, the winding pulley is left unwound by the lifting / lowering cord, so that the influence of the rotational force acting on the winding pulley by the lifting / lowering cord is eliminated. Therefore, there is an effect that the shielding material can be surely lowered to the lowest position by its own weight.

JP 2000-179261 A

  However, when the lifting / lowering cord is wound from the large-diameter side of the winding pulley toward the small-diameter side, the wound portion of the lifting / lowering cord is pushed out toward the small-diameter side. However, on the small-diameter side, the lifting / lowering cord near the lifting / lowering cord connecting portion is liable to be slackened due to a difference in winding diameter, and is wound in a floating state. If the take-up pulley is driven in the reverse direction and the lifting / lowering cord is rewound in that state, the lifting / lowering cord that has been lifted during the rewinding will overlap with the portion where the lifting / lowering cord has been wound. There was a problem that the return was hindered.

  Therefore, the present invention has been made in view of such problems, and an object of the present invention is to provide a blind capable of reducing problems caused by loosening of the wound lifting cord.

  In order to solve the above-described problems, according to the present invention, there is provided a blind including a winding drum that winds up and down a cord, and the winding drum is connected to one end of the lifting cord at one end. And a winding start part of the lifting / lowering cord located on the other end side from the connecting part, and a winding surface for winding the lifting code from the winding start part to the connecting part, A blind is provided, characterized in that a large-diameter portion for absorbing slack of the elevating cord is provided on the winding surface adjacent to the connecting portion.

  According to this structure, even if slack occurs in the wound up / down cord, the winding surface near the connecting portion of the lifting / lowering cord at one end of the winding drum has a larger diameter than the other winding surfaces. Absorbing at the large diameter part can prevent lifting of the lifting cord.

  The present invention can be applied in various ways. The following application examples can be appropriately combined. For example, the large diameter portion may have an inclined surface that is inclined toward the winding surface. Since the large diameter portion has the inclined surface, the slacking lifting cord can be smoothly guided to the large diameter portion.

  The large diameter portion may be constituted by a guide piece that can be attached to the winding drum. Since the inclined surface can be separated from the winding surface, that is, by forming the winding drum and the guide piece separately from each other, the winding drum itself does not need to have a large diameter at one end. It becomes easy.

  The guide piece may be attachable so as to cover at least a part of the outer periphery of the winding surface. Since the guide piece is structured to cover at least a part of the outer periphery of the winding surface, the guide piece can be attached from the direction perpendicular to the axial direction of the winding drum, and in the case of a large diameter portion having an inclined surface The continuity between the winding surface and the inclined surface is ensured.

  Moreover, the notch part may be formed in the said guide piece, and the said connection part may be arrange | positioned at the said notch part. By forming a notch portion in the guide piece that communicates with the connecting portion of the lifting / lowering cord, the guide piece can be provided on both sides of the lifting / lowering cord winding direction with the connecting portion as a boundary, and the right and left parts can be shared. At the same time, since the lifting / lowering cord can be assembled even after connecting, the assembling property of the winding device is improved.

  The winding drum is formed with a plurality of ribs extending in the axial direction of the winding drum, and the winding surface includes a surface of the plurality of ribs and a bottom surface portion formed between the ribs. You may make it consist of. By forming a plurality of ribs extending in the axial direction of the winding drum on the winding surface, the lifting cord comes into contact with the ribs on the winding surface, so the contact area with the winding surface is reduced, The lifting / lowering cord (winding portion) can smoothly move on the winding surface.

  Further, the height of each rib is a height such that the circumference of the circumference connecting the vertices of each rib is constant from the winding start portion toward the connecting portion, and the bottom portion is The height may gradually decrease from the winding start portion toward the connecting portion. With such a configuration, it is easy to remove the winding drum from the processing mold at the time of molding, and the rib portion can be easily molded.

  In order to solve the above-described problems, according to the present invention, there is provided a blind including a winding drum that winds up and down a cord, and the winding drum is connected to one end of the lifting cord at one end. A winding start portion of the lifting / lowering cord located on the other end side of the connecting portion, a winding surface for winding the lifting cord from the winding start portion to the connecting portion, and the winding drum A plurality of ribs extending in the axial direction, and the circumferential diameter of the winding drum gradually decreases (smaller) from the winding start portion toward the winding surface. The chamfering surface comprises a surface of the plurality of ribs and a bottom surface portion formed between the ribs, and the height of each rib is such that the circumferential diameter connecting the vertices of each rib is the winding diameter. The height is constant from the start side toward the connecting portion, and the bottom Parts are gradually height toward the connecting portion from the winding start portion side, characterized in that the lower, blind is provided.

  According to such a configuration, it is possible to reduce the amount of looseness by providing ribs having such a height that the circumference of the circumference connecting the apexes of the ribs is constant from the winding start portion toward the connecting portion. it can. In this way, it is possible to reduce problems caused by the slack of the wound up and down cord.

  ADVANTAGE OF THE INVENTION According to this invention, the blind which can reduce the malfunction resulting from the slack of the raising / lowering cord wound up is provided. Other effects of the present invention will also be described in a mode for carrying out the invention described later.

It is the figure which showed roughly the whole structure of the blind 100 concerning 1st Embodiment. It is an enlarged view of the drum vicinity. It is a perspective view of the drum, (a) is a diagram showing a state in which the guide piece is removed from the winding drum, (b) is a diagram showing a state in which the winding drum and the guide piece are assembled, (C) is a figure which shows the state in which the drum and the drum receiver were assembled | attached. It is a figure for demonstrating a winding drum, (a) is a front view of a winding drum, (b) is a right view of a winding drum, (c) is AA of (b). It is sectional drawing, (d) is BB sectional drawing of (b). It is a figure for demonstrating a winding drum, (a) is CC sectional drawing of Fig.4 (a), (b) is DD sectional drawing of Fig.4 (a), (c ) Is an EE cross-sectional view of FIG. It is a figure for demonstrating the procedure which incorporates a guide piece in a winding drum, (a) is a perspective view before incorporating a guide piece in a winding drum, (b) incorporated the guide piece in a winding drum. It is a rear perspective view. It is a figure for demonstrating the procedure which winds a raising / lowering cord around a drum, (a) is a top view which shows the state before winding up a raising / lowering cord from a drum, (b) has started winding up a raising / lowering cord around a drum. (C) is a plan view showing a state in which the lifting / lowering cord is further wound around the drum, and (d) is a plan view showing a state in which the lifting / lowering cord is most wound around the drum. . It is a figure for demonstrating the procedure which winds a raising / lowering cord to the drum in which the guide piece is not provided, (a) is a top view which shows the state before winding up a raising / lowering cord to a drum, (b) is a drum It is a top view which shows the state which began to wind up the raising / lowering cord, (c) is a top view which shows the state which wound up the raising / lowering cord around the drum further, (d) is the state which wound up the raising / lowering cord around the drum most FIG. It is a figure for demonstrating the procedure which unwinds a raising / lowering cord from a drum, (a) is a top view which shows the state before unwinding a raising / lowering cord around a drum, (b) is beginning to unwind a raising / lowering cord from a drum (C) is a plan view showing a state where the lifting / lowering cord is further unwound from the drum, and (d) is a plan view showing a final stage of unwinding. It is a figure for demonstrating the procedure which unwinds a raising / lowering cord from the drum in which the guide piece is not provided, (a) is a top view which shows the state before unwinding a raising / lowering cord around a drum, (b) is a drum It is a top view which shows the state which started unwinding the raising / lowering cord from (c), (c) is a top view which shows the state which further unwound the raising / lowering cord from the drum, (d) is a top view which shows the final stage of unwinding It is. It is a figure for demonstrating the blind 200 concerning 2nd Embodiment, (a) is a perspective view which shows the state from which the guide piece and the spacer were removed from the winding drum, (b) is a winding drum and It is a perspective view which shows the state with which the guide piece and the spacer were assembled | attached.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

(First embodiment)
A first embodiment of the present invention will be described. First, the overall configuration of the blind 100 according to the present embodiment will be described with reference to FIGS. FIG. 1 is a diagram schematically showing the overall configuration of the blind 100. FIG. 2 is an enlarged view of the vicinity of the drum. FIG. 3 is a perspective view of the drum. FIG. 6 is a view for explaining a procedure for incorporating the guide piece into the winding drum.

  As shown in FIGS. 1 to 6, the blind 100 includes a winding drum 132 that winds the lifting / lowering cord 120 in the head box 110, and the winding drum 132 has one end of the lifting / lowering cord 120 on one end side. Connected to the connecting portion 132a, the winding start portion 132b of the lifting / lowering cord 120 located on the other end side of the connecting portion 132a, and the winding to wind the lifting / lowering cord 120 from the winding start portion 132b to the connecting portion 132a And a large diameter portion 134 that absorbs slackness of the lifting / lowering cord 120 is provided on the winding surface 132c adjacent to the connecting portion 132a.

  First, a schematic configuration of the entire blind 100 of the present embodiment will be described with reference to FIG. The blind 100 according to this embodiment includes the above-described head box 110, a lifting cord 120 depending from the head box, a plurality of slats 140 that are lifted and lowered by the lifting cord 120, and a ladder cord 150 that supports the plurality of slats 140 in an aligned state. And a bottom rail 160 provided below the plurality of rows of slats 140 to which the lower end of the lifting / lowering cord 120 and the lower end of the ladder cord 150 are connected. Hereinafter, the configuration of each unit will be described in detail.

(Head box 110)
The head box 110 is fixed to an opening such as a window frame or a ceiling via a bracket. As shown in FIG. 1, a rotary shaft 112 extending in the longitudinal direction of the head box 110 is rotatably supported in the head box 110. The head box 110 is provided with drums 130 at three locations in the longitudinal direction. The rotating shaft 112 passes through each drum 130 and rotates integrally with each drum 130. Further, the head box 110 is provided with a motor 114 that rotates the rotating shaft 112, a control unit 116 that controls the driving of the motor 114, and an encoder 118 that detects the rotation angle of the motor 114.

(Elevating cord 120)
The lifting / lowering cord 120 moves the slat 140 up and down. As shown in FIG. 1, the lifting / lowering cord 120 has an upper end coupled to the drum 130 in the head box 110 so as to be wound and unwound. The lower end of the lifting / lowering cord 120 hangs down from the head box 110 and is connected to the bottom rail 160 through the plurality of slats 140.

(Drum 130)
The drum 130 winds and unwinds the lifting / lowering cord 120. As shown in FIG. 1, the drum 130 is provided at three locations in the longitudinal direction of the head box 110, and the lifting / lowering cord 120 is connected to the winding drum 132 of each drum 130. As shown in FIG. 2, the drum 130 includes a winding drum 132 that raises and lowers the lifting / lowering cord 120, a guide piece 134 that absorbs slackness of the lifting / lowering cord 120, a rotating drum 136 that tilts the ladder cord 150, and a drum receiver 138.

(Winding drum 132)
As described above, the winding drum 132 lifts and lowers the lifting / lowering cord 120 by winding and unwinding the lifting / lowering cord 120. As shown in the drawing showing the state where the guide piece 134 is removed from the take-up drum 132 in FIG. 3A, the take-up drum 132 is connected to one end of the lifting / lowering cord 120 at one end 132a. And the winding start part 132b of the raising / lowering cord 120 and the winding surface 132c which winds the raising / lowering cord 120 located in the other end side from the connection part 132a are formed. Further, the winding drum 132 is formed with a plurality of ribs 132d extending in the axial direction of the winding drum 132 over the entire circumference.

  As shown in the drawing showing the state in which the winding drum 132 and the guide piece 134 of FIG. 3B are assembled on the winding surface 132c adjacent to the connecting portion 132a, the guide piece 134 is provided. As shown in FIG. 3A, ribs 132d to be described later are not formed on the portion of the winding surface 132c to which the guide piece 134 is attached. A first support shaft 132f and a second support shaft 132g protrude in the axial direction from the axial centers of both ends of the winding drum 132. The first support shaft 132f and the second support shaft 132g are rotatably supported by the drum receiver 138 as shown in the drawing of the state where the drum and the drum receiver of FIG. The first support shaft 132f is longer than the second support shaft 132g, and a rotary drum 136, which will be described later, is fitted on the first support shaft 132f. The rotary drum 136 is a predetermined angle with respect to the first support shaft 132f. Rotates together.

  As shown in FIGS. 4A and 4B, the winding surface 132c includes a surface of a plurality of ribs 132d and a bottom surface portion 132e formed between the ribs 132d. The rib 132d has a circular arc shape, and the height of the rib 132d is determined by the circumference of the circumference connecting the vertices of each rib 132d (referred to as drum circumference) as shown in FIG. The height is constant from the portion 132b toward the connecting portion 132a. Further, the bottom surface portion 132e is configured such that the height gradually decreases from the winding start portion 132b toward the connecting portion 132a.

  As shown in FIG. 4C, the diameter of the winding surface 132c is determined from the circumferential diameter X on the winding start portion side in the drawing of the winding start portion 132b. By being constituted by an inclined surface that is reduced in diameter toward the inner drum circumference Y, the outer circumference of the winding surface 132c is larger than the inner circumference of the lifting / lowering cord 120 wound around the winding start portion 132b. Is getting smaller. The outer periphery of the winding surface 132c is formed to have the same diameter (drum peripheral diameter Y in the figure) from the middle of the winding surface 132c to the connecting portion 132a, but the outer periphery is smaller than the winding start portion 132b. ing. Therefore, since the friction between the winding surface 132c and the lifting / lowering cord 120 is smaller than that of the winding start portion 132b, the lifting / lowering cord 120 wound around the winding surface 132c is easily moved in the direction of the connecting portion 132a. Yes. Further, since the rib 132d is formed on the winding surface 132c, the friction of the winding surface 132c is further reduced. Therefore, the lifting / lowering cord 120 wound around the winding surface 132c becomes easier to move on the winding surface 132c.

  As shown in FIG. 4D, the bottom surface portion 132e formed between the ribs 132d is configured such that the height gradually decreases from the winding start portion 132b toward the connecting portion 132a. . First, in the portion of the CC cross section in FIG. 4A, which is in the vicinity of the winding start portion 132b, as shown in FIG. 5A, the height of the bottom surface portion 132e and the height of each rib 132d are the same. It is. Next, in the DD cross section in FIG. 4A, which is the axial central portion of the winding drum 132, as shown in FIG. 5B, the height of the bottom surface portion 132e is the height of each rib 132d. A little lower than this. Finally, in the portion of the EE cross section in FIG. 4A, which is in the vicinity of the connecting portion 132a, as shown in FIG. 5C, the height of the bottom surface portion 132e is further lower than the height of each rib 132d. Become. In this manner, the size of the bottom surface portion 132e in the radial direction gradually decreases from the drum circumferential diameter Y having the same size as the rib 132d to the circumferential diameter Z on the connecting portion side that is smaller than the drum circumferential diameter Y.

  Further, as shown in FIG. 5C, the diameter of the rib 132d itself has a shape that gradually decreases from the winding start portion 132b toward the connecting portion 132a. That is, the diameter of the rib 132d2 on the coupling portion 132a side is smaller than that of the rib 132d1 of the winding start portion 132b. With such a configuration, it is easy to remove the winding drum 132 from the processing mold during molding, and the rib 132d portion can be easily molded.

(Guide piece 134)
The guide piece 134 is attached to the winding surface 132c and constitutes a larger diameter portion than the diameter of the winding surface 132c, thereby absorbing the slack of the lifting / lowering cord 120. As shown in FIG. 3A, the guide piece 134 can be attached so as to cover at least a part of the outer periphery of the winding surface 132c. The guide piece 134 includes an attachment portion 134a attached to the winding surface 132c, a first large diameter portion 134b and a second large diameter portion 134c that absorb slack of the elevating cord 120, a first large diameter portion 134b, and a second large size. And a notch part 134d in which a connecting part 132a provided between the diameter part 134c is disposed.

  As shown in FIG. 3A, the attachment portion 134a has a wide, thin-walled arc shape, and is made of an elastically deformable material such as a resin. Therefore, when the attachment part 134a is attached to the winding surface 132c, the arcuate opening part 134e is elastically deformed and opened.

  As shown in FIG. 3A, the first large diameter portion 134b and the second large diameter portion 134c are provided so as to protrude in a trapezoidal shape in the axial direction from one side edge of the attachment portion 134a. The periphery of the first large diameter portion 134b and the second large diameter portion 134c is an inclined surface 134f that is inclined toward the winding surface 132c.

  The notch part 134d is provided between the first large-diameter part 134b and the second large-diameter part 134c, and is formed in a V shape that becomes wider as the distance from the attachment part 134a increases. As shown in FIG. 3B, a connecting portion 132a is arranged at the end of the notch portion 134d on the mounting portion 134a side. For this reason, since the raising / lowering cord 120 is wound around the winding surface 132c along the V-shape of the notch portion 134d, the first large diameter portion 134b and the second large diameter portion 134c do not interfere with the winding of the lifting cord 120. .

(Rotating drum 136)
The rotating drum 136 is for tilting the ladder cord 150. As shown in FIG. 2, the rotary drum 136 is fitted to the first support shaft 132f of the winding drum 132 as described above, and the rotary drum 136 is integrated with the first support shaft 132f by a predetermined angle. Rotate. The upper end of the ladder cord 150 is connected to the rotating drum 136. The ladder cord 150 is tilted by the upper end of the ladder cord 150 being wound or unwound by the rotation of the rotary drum 136 by a predetermined angle.

(Drum receiver 138)
The drum receiver 138 supports the winding drum 132 rotatably. The drum receiver 138 is fixed to the head box 110 as shown in FIG. A plurality of insertion holes 138 a through which the lifting / lowering cord 120 and the ladder cord 150 are inserted are provided at the bottom of the drum receiver 138. Each insertion hole 138 a is provided at a position corresponding to the winding start portion 132 b of the lifting / lowering cord 120 formed in the winding drum 132. The lifting / lowering cord 120 and the ladder cord 150 are suspended from the head box 110 through the insertion holes 138a.

  Next, a procedure for attaching the guide piece 134 to the winding drum 132 will be described with reference to FIG. 6 is a view for explaining a procedure for incorporating the guide piece 134 into the winding drum 132. FIG. 6A is a perspective view before the guide piece 134 is assembled into the winding drum 132, and FIG. FIG. 4B is a perspective view after the guide piece 134 is incorporated into the winding drum 132.

  When the guide piece 134 is attached to the winding surface 132c, as shown in FIG. 6A, the lifting / lowering cord 120 is already wound around the winding surface 132c. The guide piece 134 is pushed in the radial direction of the winding surface 132c with the arc-shaped opening 134e of the mounting portion 134a facing the outer periphery of the winding surface 132c. For this reason, the attachment part 134a is elastically deformed so that the opening part 134e spreads, and is attached to the winding surface 132c as shown in FIG. 6B. As described above, the lifting / lowering cord 120 is already wound around the winding surface 132c, but the guide piece 134 is provided with a notch portion 134d, and the notch portion 134d has a winding angle of the lifting / lowering cord 120. Therefore, when the guide piece 134 is attached to the winding surface 132c, the lifting / lowering cord 120 is disposed in the notch 134d. For this reason, the raising / lowering cord 120 is not pinched | interposed between the guide piece 134 and the winding surface 132c.

  The configuration of the blind 100 according to the present embodiment has been described above. Next, the operation of the blind 100 will be described with reference to FIGS. FIG. 7 is a diagram for explaining a procedure for winding the lifting / lowering cord 120 around the drum 130, and FIG. 8 is a diagram for explaining a procedure for winding the lifting / lowering cord around the drum on which no guide piece is provided. 9 is a diagram for explaining a procedure for unwinding the lifting / lowering cord from the drum 130, and FIG. 10 is a diagram for explaining a procedure for unwinding the lifting / lowering cord from the drum not provided with the guide piece. .

  First, a procedure for winding the lifting / lowering cord 120 around the drum 130 will be described with reference to FIGS. 7 is a diagram for explaining a procedure for winding the lifting / lowering cord 120 around the drum 130. FIG. 7 (a) is a plan view showing a state before the lifting / lowering cord 120 is wound around the drum 130. FIG. FIG. 7B is a plan view showing a state where the lifting / lowering cord has started to be wound around the drum, FIG. 7C is a plan view showing a state where the lifting / lowering cord is further wound around the drum, and FIG. It is a top view which shows the state which wound up the raising / lowering cord to the drum most. FIG. 8 is a diagram for explaining a procedure for winding the lifting / lowering cord on a drum on which no guide piece is provided. FIG. 8 (a), FIG. 8 (b), FIG. 8 (c), and FIG. ) Are states corresponding to the states of FIGS. 7A, 7B, 7C, and 7D, respectively.

  First, winding of the lifting / lowering cord 120 in the case of the drum 130 in which the guide piece 134 is provided on the winding drum 132 will be described with reference to FIG.

  Before winding the lifting / lowering cord 120 around the winding drum 132, as shown in FIG. 7A, the V-shaped notch 134d extends from the connecting portion 132a along the second large diameter portion 134c of the guide piece 134. The elevating cord 120 passes through the inside. The lifting / lowering cord 120 is wound around the winding drum 132 without slack.

  When the lifting / lowering cord 120 starts to be wound around the winding drum 132, as shown in FIG. 7B, the lifting / lowering cord 120 is wound around the winding drum 132 from the winding start portion 132b and wound first. The raised / lowered cord 120 is pushed in the direction of the connecting portion 132a by the portion to be wound later, and the wound up / down cord 120 is moved by sliding the winding drum 132 in the direction of the connecting portion 132a. Therefore, the lifting / lowering cord 120 rides on the inclined surface 134f of the second large-diameter portion 134c because the angle θ with respect to the axial direction of the winding drum 132 increases with winding. Since the lifting / lowering cord 120 rides on the inclined surface 134f of the guide piece 134, the lifting / lowering cord 120 is wound around the winding drum 132 without the slack of the lifting / lowering cord 120 occurring.

  When the lifting / lowering cord 120 is further wound on the winding drum 132, as shown in FIG. 7C, the lifting / lowering cord 120 previously wound on the winding drum 132 moves the winding drum 132 toward the connecting portion 132a. Slip on and move further. For this reason, as the lifting / lowering cord 120 is further wound, the angle θ with respect to the axial direction of the drum 130 is further increased, so that the inclined surface 134f of the second large diameter portion 134c is further ridden. At this time, since the outer circumference of the winding surface 132c has the same diameter from the middle of the winding surface 132c to the connecting portion 132a by the rib 132d, the slack amount of the lifting / lowering cord 120 is wound over the entire length of the connecting portion 132a from the winding surface 132c. Although the size of the outer periphery of the surface 132c is not less than that which becomes smaller, the lifted cord 120 that has been loosened further rides on the inclined surface 134f of the second large diameter portion 134c. The lifting / lowering cord 120 is wound around the winding drum 132 without the slack of the lifting / lowering cord 120 occurring.

  When the lifting / lowering cord 120 is completely wound around the winding drum 132, as shown in FIG. 7D, the lifting / lowering cord 120 previously wound on the winding drum 132 connects the winding drum 132 to the connecting portion 132a. It moves to the vicinity. For this reason, the lifting / lowering cord 120 is pushed out to a higher position on the inclined surface 134f of the second large diameter portion 134c so as to absorb the slack. Since the lifting / lowering cord 120 is pushed out to a higher position on the inclined surface 134f of the second large-diameter portion 134c, the lifting / lowering cord 120 is wound around the winding drum 132 without the slackening of the lifting / lowering cord 120 even at this time. .

  Next, winding of the lifting / lowering cord 120 when the guide piece 134 is not provided on the winding drum 132 will be described with reference to FIG.

  Before winding the lifting / lowering cord 120 on the winding drum 132, as shown in FIG. 8A, the lifting / lowering cord 120 is wound from the connecting portion 132a in the same manner as the drum 130 provided with the guide piece 134. The starting portion 132b is wound without slack.

  When the lifting / lowering cord 120 starts to be wound around the winding drum 132, as shown in FIG. 8B, the lifting / lowering cord 120 is wound around the winding drum 132 from the winding start portion 132b and wound first. The raised / lowered cord 120 is pushed in the direction of the connecting portion 132a by the portion to be wound later, and the wound up / down cord 120 is moved by sliding the winding drum 132 in the direction of the connecting portion 132a. For this reason, the angle with respect to the axial direction of the winding drum 132 up to the connecting portion 132 a of the lifting / lowering cord 120 initially wound on the winding drum 132 increases as the lifting / lowering cord 120 is wound. Therefore, the lifting cord 120 is likely to be slack.

  When the lifting / lowering cord 120 is further wound on the winding drum 132, as shown in FIG. 8C, the lifting / lowering cord 120 previously wound on the winding drum 132 moves the winding drum 132 toward the connecting portion 132a. To slip further and move. For this reason, the raising / lowering cord 120 is extruded in the direction of the connection part 132a with winding. Therefore, the angle with respect to the axial direction of the winding drum 132 up to the connecting portion 132a of the lifting / lowering cord 120 that is first wound around the winding drum 132 is further increased. For this reason, as shown in the circled portion in the figure, the lifting cord 120 is slackened.

  When the lifting / lowering cord 120 is completely wound around the winding drum 132, as shown in FIG. 8D, the lifting / lowering cord 120 previously wound on the winding drum 132 connects the winding drum 132 to the connecting portion 132a. It slides further in the direction. For this reason, the raising / lowering cord 120 is further pushed out in the direction of the connection part 132a with winding. Therefore, the angle with respect to the axial direction of the winding drum 132 up to the connecting portion 132a of the lifting / lowering cord 120 that is first wound around the winding drum 132 is further increased. For this reason, as shown in the circled portion in the figure, the slack of the lifting / lowering cord 120 is further increased.

  Next, the procedure for unwinding the lifting / lowering cord 120 from the drum 130 will be described with reference to FIGS. 9 is a diagram for explaining a procedure for unwinding the lifting / lowering cord 120 around the drum 130. FIG. 9 (a) is a plan view showing a state in which the lifting / lowering cord 120 is unrolled around the drum 130. FIG. (B) is a plan view showing a state in which the lifting / lowering cord is further unwound from the drum, FIG. 9 (c) is a plan view showing a state in which the lifting / lowering cord is further unwound from the drum, and FIG. It is a top view which shows the last stage of unwinding. FIG. 10 is a diagram for explaining a procedure for winding the lifting / lowering cord around a drum on which no guide piece is provided. FIG. 10 (a), FIG. 10 (b), FIG. 10 (c), and FIG. ) Are states corresponding to the states of FIGS. 9A, 9B, 9C, and 9D, respectively.

  First, unwinding of the elevating cord 120 in the case of the drum 130 in which the guide piece 134 is provided on the winding drum 132 will be described with reference to FIG.

  At the beginning of unwinding the lifting / lowering cord 120 on the winding drum 132, as shown in FIG. 9 (a), the lifting / lowering cord 120 is pushed out to a high position on the inclined surface 134f of the guide piece 134. It winds around the winding drum 132 without slack. The lifting / lowering cord 120 is unwound from the winding start portion 132b side.

  When the lifting / lowering cord 120 is further unwound from the winding drum 132, as shown in FIG. 9B, the lifting / lowering cord 120 maintains a state where it is pushed out to a high position on the inclined surface 134f of the guide piece 134. The elevating cord 120 is wound around the winding drum 132 without slack.

  When the lifting / lowering cord 120 is further unwound from the winding drum 132, as shown in FIG. 9C, the lifting / lowering cord 120 is further unwound, but the connecting portion 132 a side of the lifting / lowering cord 120 is an inclined surface of the guide piece 134. It is pushed out to a high position of 134f. For this reason, even at this time, the lifting / lowering cord 120 is wound around the winding drum 132 without slack.

  The lifting / lowering cord 120 is further unwound from the winding drum 132, and in the final stage of unwinding, as shown in FIG. 9 (d), the lifting / lowering cord 120 is further unwound, but the connecting portion 132a side of the lifting / lowering cord 120 is The guide piece 134 is pushed out to a high position on the inclined surface 134f. Therefore, even at this stage, the lifting / lowering cord 120 is wound around the winding drum 132 without causing slack. In this manner, the lifting / lowering cord 120 can be unwound while being wound around the winding drum 132 in a state where it is aligned to the end.

  Next, unwinding of the lifting / lowering cord 120 when the guide piece 134 is not provided on the winding drum 132 will be described with reference to FIG.

  As shown in FIG. 10A, the winding cord 120 is wound around the winding drum 132 at the beginning of unwinding of the lifting / lowering cord 120. The lifting / lowering cord 120 is unwound from the winding start portion 132b side.

  When the lifting / lowering cord 120 is further unwound from the winding drum 132, as shown in FIG. 10B, the lifting / lowering cord 120 is loosely wound around the winding drum 132 on the connecting portion 132a side, and the lifting / lowering cord 120 is also loosened. The slack part of overlaps the winding part.

  When the lifting / lowering cord 120 is further unwound from the winding drum 132, as shown in FIG. 10C, the portion where the winding around the winding drum 132 becomes loose gradually moves toward the connecting portion 132a. The slack portion of the lifting / lowering cord 120 on the connecting portion 132a side further overlaps the winding surface 132c.

  In the final stage of unwinding the lifting / lowering cord 120 from the winding drum 132, as shown in FIG. 10 (d), the winding of the lifting / lowering cord 120 partially overlaps and is not aligned. The unwinding of 120 is not constant, resulting in an unstable descent.

(Effects of the first embodiment)
As described above, according to the present embodiment, the winding surface 132c adjacent to the connecting portion 132a of the lifting / lowering cord 120 at one end of the winding drum 132 has a larger diameter than the other winding surface 132c. Even if the hoisting / lowering cord 120 is loosened, it is absorbed by the large diameter portions 134b and 134c, and the lifting / lowering cord 120 can be prevented from being lifted.

  Moreover, since the large diameter parts 134b and 134c have the inclined surface 134f, the slackened lifting / lowering cord 120 can be smoothly guided to the large diameter parts 134b and 134c.

  Further, the inclined surface 134f can be separated from the winding surface 132c, that is, the winding drum 132 and the guide piece 134 are formed of different members, so that the winding drum 132 itself needs to have a large diameter at one end. Therefore, it becomes easy to mold the parts.

  Further, since the guide piece 134 is structured to cover at least a part of the outer periphery of the winding surface 132c, the guide piece 134 can be attached from a direction perpendicular to the axial direction of the winding drum 132, and the winding surface 132c. And the continuity of the inclined surface 134f are ensured.

  In addition, by forming a notch portion 134d communicating with the connecting portion 132a of the lifting / lowering cord 120 in the guide piece 134, the lifting / lowering cord 120 can be assembled even after being connected, so that the assembly property of the drum 130 is improved. .

  The winding drum 132 is formed with a plurality of ribs 132d extending in the axial direction of the winding drum 132, and the winding surface 132c is a bottom surface formed between the surfaces of the plurality of ribs 132d and the ribs 132d. Since the lifting / lowering cord 120 comes into contact with the ribs 132d on the winding surface 132c, the contact area with the winding surface 132c is reduced on the winding surface 132c. However, the winding surface 132c can be moved smoothly.

  The height of each rib 132d is such that the circumference of the circumference connecting the vertices of each rib 132d is constant from the winding start portion 132b toward the connecting portion 132a. The bottom surface portion 132e to be formed is configured so that the height gradually decreases from the winding start portion 132b toward the connecting portion 132a, so that the winding drum 132 can be easily removed from the processing mold during molding, The rib 132d portion can be easily molded.

(Second Embodiment)
A second embodiment of the present invention will be described. First, the configuration of the drum 230 of the blind 200 according to the present embodiment will be described with reference to FIG. FIG. 11 is a view for explaining the drum 230 of the present embodiment, and FIG. 11A is a perspective view showing a state where the guide piece 234 and the spacer are removed from the winding drum 232, and FIG. FIG. 3 is a perspective view showing a state in which a winding drum 232, a guide piece 234, and a spacer are assembled. The present embodiment is different from the first embodiment in the configuration of the drum 230, and the other configurations are the same as those in the first embodiment. In the present embodiment, a description will be given centering on differences from the first embodiment. Constituent elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 11, the drum 230 includes a winding drum 232, a guide piece 234 that forms a large diameter portion of the winding drum 232, and a spacer that restricts the guide piece 234 from falling off the winding drum 232. 239.

(Winding drum 232)
As shown in FIG. 11A, the winding drum 232 includes a connecting portion 232a, a winding start portion 232b, and a rib 232d, similarly to the winding drum 132 of the first embodiment. In the winding drum 132 of the first embodiment, the ribs 232d are not formed on the portion where the guide piece 134 is attached, whereas all the ribs 232d extend to a position near the connecting portion 232a. Yes. The winding drum 232 includes a spacer attachment portion 232f to which a spacer 239 described later is attached between the connection portion 232a and the end portion. Other configurations of the winding drum 232 are the same as those in the first embodiment.

(Guide piece 234)
The guide piece 234 is fitted on the winding drum 232 to constitute a large diameter portion. As shown in FIG. 11A, the guide piece 234 is formed in a cylindrical shape, and a V-shaped notch 234d is formed at one place on the circumference. In the guide piece 234, the portions on both sides of the notch 234d are portions corresponding to the first large diameter portion 134b and the second large diameter portion 134c of the first embodiment.

  On the inner peripheral surface of the guide piece 234, uneven portions 234g that are uneven in the radial direction are formed continuously in the circumferential direction. In addition, the tip of the guide piece 234 is also uneven in the axial direction along the uneven portion 234g. The uneven portion 234g corresponds to the unevenness of the rib 232d of the take-up drum 232, and when the guide piece 234 is attached to the take-up drum 232, the uneven portion 234g and the rib 232d are fitted and restricted from rotating relative to each other. .

  The rear end of the guide piece 234 is a frame portion 234i formed with a large diameter by forming a shoulder portion 234h. An end portion of a spacer 239, which will be described later, is inserted into the frame portion 234i, and the tip of the spacer 239 comes into contact with the shoulder portion 234h to restrict the movement of the guide piece 234 in the axial direction.

(Spacer 239)
The spacer 239 restricts the guide piece 234 from moving in the axial direction of the winding drum 232. As shown in FIG. 11A, the spacer 239 has a wide and thin arc shape, and is formed of an elastically deformable material such as resin. Therefore, when the spacer 239 is attached to the take-up drum 232, the arc opening 239a is elastically deformed and opened. The spacer 239 is fitted into a spacer mounting portion 232 f between the connecting portion 232 a and the end of the winding drum 232.

  In the drum 230, as shown in FIG. 11B, the guide piece 234 is inserted into the take-up drum 232 from the end on the coupling portion 232a side in the axial direction, and the spacer mounting portion 232f goes straight to the shaft of the take-up drum 232. It is comprised by attaching the spacer 239 from the direction to do. In the drum 230 configured as described above, the guide piece 234 is arranged at a position corresponding to the connecting portion 232a of the winding drum 232 with the V-shaped bottom portion of the notch 234d with respect to the winding drum 232, and the uneven portion 234 g is arranged so as to fit into the rib 232 d of the winding drum 232.

  The spacer 239 is arranged so that the tip of the spacer 239 is inserted into the frame portion 234 i of the guide piece 234 and abuts against the shoulder portion 234 h with respect to the guide piece 234.

  The operation of this embodiment is substantially the same as that of the first embodiment. That is, like the guide piece 134 of the first embodiment, the guide piece 234 can absorb the slack of the lifting / lowering cord when the lifting / lowering cord is wound or unwound.

(Effect of 2nd Embodiment)
As described above, according to the present embodiment, in addition to the effects of the first embodiment, the guide piece 234 is wound so that the uneven portion 234g of the guide piece 234 and the rib 232d of the winding drum 232 are fitted. It can be attached to the drum 232. For this reason, it can be regulated that the guide piece 234 rotates relative to the take-up drum 232 and is displaced.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in the above embodiment, the winding surface is formed with ribs on the winding surface to reduce resistance to the lifting cord and the outer diameter of the winding surface is the same diameter over the connecting portion. The invention is not limited to this example. For example, the winding drum may have the same diameter over the entire length or a shape that is reduced in diameter as long as the wound lifting cord is easy to move from the winding start portion toward the connecting portion. . The rib may or may not be present. Further, as a configuration in which the wound lifting cord is easy to move, for example, the winding drum may be processed so that the frictional resistance decreases from the winding start portion toward the connecting portion.

  Moreover, in the said embodiment, although the guide piece was attached to the winding drum and the large diameter part was comprised, this invention is not limited to this example. For example, the large diameter portion may be integrally formed with the winding drum. Further, the large-diameter portion may be configured by attaching the guide piece to the winding drum by adhesion or welding.

  In the above embodiment, the notch portion is formed in one guide piece to form two large diameter portions, and the connecting portion is arranged in the notch portion. However, the present invention is limited to this example. Not. For example, two or more guide pieces may be provided, and the connecting portion may be disposed between two adjacent guide pieces, or the large diameter portion may be used as one guide piece in accordance with the winding direction of the lifting / lowering cord. Good.

  Moreover, in the said embodiment, although the magnitude | size of the diameter of each rib changed so that it might become small gradually toward a connection part from a winding start part, this invention is not limited to this example. For example, the size of the rib diameter may gradually increase from the winding start portion toward the connecting portion, or may be the same size from the winding start portion to the entire length of the connecting portion.

  Moreover, in the said embodiment, although the large diameter part was provided in the winding surface, the malfunction resulting from the slack of the raising / lowering cord wound was reduced, However, This invention is not limited to this example. For example, the winding surface is not provided with a large diameter portion, and only a rib having a height such that the circumference of the circumference connecting the apexes of the rib is constant from the winding start portion toward the coupling portion is provided. This may reduce the amount of slack generation.

  The above embodiment, application examples, and modification examples can be implemented in any combination.

100, 200 Blind 110 Head box 112 Rotating shaft 114 Motor 116 Control unit 118 Encoder 120 Lifting cord 130, 230 Drum 132, 232 Winding drum 132a, 232a Connecting portion 132b Winding start portion 132c, 232c Winding surface 132d, 232d Rib 132e bottom surface portion 132f first support shaft 132g second support shaft 134, 234 guide piece 134a mounting portion 134b first large diameter portion 134c second large diameter portion 134d, 234d notch portion 134e opening portion 134f inclined surface 136 rotating drum 138 drum 138a Insertion hole 140 Slat 150 Ladder cord 160 Bottom rail 234g Concavity and convexity 239 Spacer

Claims (8)

A blind equipped with a winding drum for winding the lifting cord,
The winding drum is
A connecting portion to which one end of the lifting / lowering cord is connected to one end side;
Winding start part of the lifting / lowering cord, located on the other end side than the connecting part,
A winding surface for winding the elevating cord from the winding start portion to the connecting portion;
Formed,
A blind, characterized in that a large-diameter portion that absorbs slack of the lifting cord is provided on the winding surface adjacent to the connecting portion.   The blind according to claim 1, wherein the large-diameter portion has an inclined surface inclined toward the winding surface.   The blind according to claim 1, wherein the large-diameter portion is configured by a guide piece that can be attached to the winding drum.   The blind according to claim 3, wherein the guide piece is attachable so as to cover at least a part of an outer periphery of the winding surface.   The blind according to claim 4, wherein a notch portion is formed in the guide piece, and the connecting portion is disposed in the notch portion. The winding drum is formed with a plurality of ribs extending in the axial direction of the winding drum,
The blind according to claim 1, wherein the winding surface includes a surface of the plurality of ribs and a bottom surface portion formed between the ribs. The height of each rib is such a height that the circumference of the circumference connecting the vertices of each rib is constant from the winding start portion toward the connecting portion,
The blind according to claim 6, wherein the bottom surface portion gradually decreases in height from the winding start portion toward the connecting portion. A blind equipped with a winding drum for winding the lifting cord,
The winding drum is
A connecting portion to which one end of the lifting / lowering cord is connected to one end side;
Winding start part of the lifting / lowering cord, located on the other end side than the connecting part,
A winding surface for winding the elevating cord from the winding start portion to the connecting portion;
A plurality of ribs extending in the axial direction of the winding drum;
Formed,
The winding drum has a circumferential diameter that gradually decreases from the winding start portion toward the winding surface,
The winding surface includes a surface of the plurality of ribs and a bottom surface portion formed between the ribs.
The height of each rib is a height such that the circumference of the circumference connecting the vertices of each rib is constant from the winding start portion side toward the connecting portion, and the bottom portion is A blind, characterized in that the height gradually decreases from the winding start portion side toward the connecting portion.