AU2014263713A1

AU2014263713A1 - Cam unit, horizontal blind, and drive unit for sunlight blocking device

Info

Publication number: AU2014263713A1
Application number: AU2014263713A
Authority: AU
Inventors: Yoshiyuki Hadano; Kazuto Yamagishi; Masaya Yamaguchi
Original assignee: Tachikawa Corp; Tachikawa Blind Manufacturing Co Ltd
Current assignee: Tachikawa Corp
Priority date: 2013-05-08
Filing date: 2014-04-25
Publication date: 2015-12-24
Anticipated expiration: 2034-04-25
Also published as: CN105209707A; AU2014263713B2; BR112015027803A2; CN105209707B; KR102116717B1; WO2014181706A1; KR20160007553A

Abstract

Provided is a structure capable of accommodating differences in length and diameter of a winding cone. This cam unit is provided with: a cone cap which is removably fitted to a winding cone for winding and unwinding a lifting cord and which rotates together with the winding cone; a rotating drum which is engaged with the cone cap so that the axial movement of the winding drum is limited, the rotating drum being configured so that, within a predetermined angular range, the rotating drum is capable of rotating relative to the cone cap, and so that, outside the predetermined angular range, the rotating drum rotates together with the cone cap; and a cam clutch which rotates together with the cone cap and which is engaged with the rotating drum so that the cam clutch moves in the axial direction relative to the cone cap as the rotating drum rotates.

Description

DESCRIPTION [Title of Invention] CAM UNIT, HORIZONTAL BLIND, AND DRIVE UNIT FOR SUNLIGHT BLOCKING DEVICE TECHNICAL FIELD [0001] A first aspect of the present invention relates to a cam unit of an obstacle detection/stop apparatus for use in sunlight shielding apparatuses, including horizontal blinds, roll-up curtains, and pleated screens. A second aspect thereof relates to a high shielding-effect horizontal blind. A third aspect thereof relates to a drive unit for use in sunlight shielding apparatuses. BACKGROUND ART [0002] First Aspect: Cam Unit of Obstacle Detection/Stop Apparatus In a sunlight shielding apparatus, one end of each lift cord is attached to a bottom rail disposed on a lower part of a sunlight shielding member suspended from a head box, and the other end thereof is attached to a winding cone. By rotating winding cones, the lift cords are wound or unwound and thus the sunlight shielding member is raised or lowered. Such a sunlight shielding apparatus rotates the winding cones in the unwinding direction using tensions applied to the lift cords on the basis of the self-weight of the bottom rail and thus lowers the bottom rail. The sunlight shielding apparatus uses an obstacle detection/stop apparatus which, when the bottom rail collides with an obstacle during a descent, stops the rotation of the winding cones to prevent excessive unwinding of the lift cords (for example, see Patent Literature 1). [0003] (The second point of view: for the high shielding type of horizontal blind) In horizontal type blind, or to lift the slats of multiple stages is supported by a ladder cord to be suspended from the head box, by or to tilt, thereby performing the adjustment of the amount of sunlight taken into the room. [0004] Ladder cord bottom bottom rail is disposed on the, by performing the extraction of the lifting cord which is attached to the bottom rail of the pull and the headbox into the headbox, and by lifting the slats by raising and lowering the bottom rail are in. typical horizontal blinds, and longitudinal to the lifting cord insertion hole is provided at the center of each slat, lift code suspended from the head box, is inserted into the lifting cord insertion hole, the bottom rail It is connected. [0005] In such a type of horizontal blinds, even if in a state of slat a fully closed, lifting cord insertion hole leaks solar radiation through, there is a case in which shielding of satisfactory can not be obtained. [0006] To solve these problems, Patent Document 2 or 3, which is suspended a lifting cord from the head box along the longitudinal direction of the edge of the slat to the bottom rail. [0007] (Third point of view: for the drive unit of solar radiation shielding device) In solar radiation shielding device, one end of the lift cord to the bottom rail, which is provided in the lower part of the solar radiation shielding material suspended from the head box is attached, the other end of the lifting cord is attached to the winding shaft, the winding shaft the by rotating, by performing a back winding and winding the lift cord to raise and lower the solar radiation shielding material. in such a solar radiation shielding device, KakeSo the operation code to the operation pulley which is rotatably supported in the headbox and then rotates the operation pulley by operating the operation code, which rotates the winding shaft by transmitting the rotation to the winding shaft (for example, refer to Patent Document 4). [Citation List] [Patent Literature] [0008] [Patent Literature 1] Japanese Patent No. 3965151 1 [Patent Literature 2] Japanese Examined Utility Model Registration Application Publication No. 3-35034 [Patent Literature 3] Japanese Unexamined Utility Model Registration Application Publication No. 64-33897 [Patent Literature 4] Japanese Unexamined Patent Application Publication No. 7 279558 SUMMARY OF INVENTION TECHNICAL PROBLEM [0009] First Aspect: Cam Unit of Obstacle Detection/Stop Apparatus In Patent Literature 1, a winding cone houses a rotating drum and a cam clutch. When the rotating drum is rotated with the rotation of the winding cone stopped, the cam clutch axially moves in the direction in which the cam clutch moves away from the winding cone, and a brake nail disposed on the cam clutch is engaged with a brake protrusion of a support member. Thus, when an obstacle is detected, the winding cone is stopped. [0010] The length or diameter of the winding cone may vary from product to product. To incorporate an obstacle detection/stop apparatus using the technology of Patent Literature 1 into all products, it is necessary to consider the configuration related to the obstacle detection/stop apparatus when designing the winding cone of each product. Thus, the design work is complicated. [0011] (The second point of view: for the high shielding type of horizontal blind) In the configuration described in Patent Documents 2 and 3, there is no need to provide a lifting cord insertion hole in the slat, solar radiation leakage problems through the hole can be solved. However, in this configuration, the full closing of the slats the ready to during lifting cord tension is applied is disposed on the outer side in the longitudinal direction than the ladder cord, Therefore, the ladder cord, it is pulled to the lifting cord, exerted a longitudinal direction outer side of the force. force in this direction is the direction of the force which the slat is in the fully closed state to the open state, as a result, the slats are slightly opened, shielding property is lowered. [0012] (Third point of view: for the drive unit of solar radiation shielding device) [0013] Patent Document 4, the operation code to the end of the headbox is provided with a solar radiation shielding device is a hard. Operation codes to operate if, as has reached the end in the width direction of the headbox room It wants provided more toward the center, but in the structure of Patent Document 4, it is not possible to change the position of the operation code. A technique which can be provided with a operation code to a desired position in the width direction of the headbox is desired. [0014] The present invention has been made in view of the foregoing. An object of the first aspect thereof is to provide a configuration which can accommodate differences in the length or diameter among winding cones; an object of the second aspect thereof is to provide a horizontal blind having extremely high shielding effects; and an object of the third aspect thereof is to provide a drive unit that is used in sunlight shielding apparatuses and in which an operation cord can be disposed in a desired position of a head box in the width direction. SOLUTION TO PROBLEM [0015] The above problems can be solved by at least one of the first to third aspects of the present invention described below. Descriptions of the first to third aspects described below can be combined, and combining them allows more favorable effects to be obtained. The object and effects of the first aspect of the present invention are achieved by the description of the first aspect; the object and effects of the second aspect of the present invention are achieved by the description of the second aspect; and the object and effects of the third aspect of the present invention are achieved by the description of the third aspect. 2 [0016] The first aspect of the present invention provides a cam unit including a cone cap that is detachably engaged with a winding cone for winding and unwinding a lift cord and rotates integrally with the winding cone, a rotating drum that is engaged with the cone cap so that an axial movement of the rotating drum is restricted and which can rotate relative to the cone cap within a predetermined angular range and rotates integrally with the cone cap when the range is exceeded, and a cam clutch that rotates integrally with the cone cap and that, when the rotating drum rotates, is engaged with the rotating drum so that the cam clutch axially moves relative to the cone cap. [0017] To avoid the complication of the design of winding cones, the inventors investigated intensively. The inventors then came up with an idea of incorporating an obstacle detection/stop apparatus into a cone cap attached to the base end of a winding cone. Based on this idea, the inventors found that even if the length or diameter of the winding cone varied, it was possible to easily implement an obstacle detection/stop apparatus by only attaching a prepared cam unit obtained by engaging a cone cap, a rotation drum, and a cam clutch with one another integrally. The inventors then completed the present invention. [0018] Various embodiments of the first aspect of the present invention will be described below. The embodiments described below can be combined with each other. Preferably, the cone cap includes a tubular brake part housing the rotating drum and the cam clutch. Preferably, the tubular brake part includes a pair of engaging protrusions. Preferably, the rotating drum includes a restricting protrusion disposed between the pair of engaging protrusions. Preferably, the cam clutch has a pair of moving slits that are engaged with the pair of engaging protrusions. Preferably, when the rotating drum rotates relative to the cone cap, the restricting protrusion contacts the engaging protrusions and thus a range in which the rotating drum can rotate relative to the cone cap is restricted. [0019] According to a second aspect of the present invention, a plurality of first and second ladder cord comprising a plurality of weft in between are suspended from the head box and a pair of warp, a bottom rail, which is arranged at the lower end of the ladder cord, and slats of a plurality of stages that are supported by a plurality of weft of the ladder code, and the first and second lifting cord to support the bottom rail is suspended from the head box, lifting between the head box and the bottom rail The cord length is varied from the headbox side and a lifting means for lifting the bottom rail, first and second lift code across the slats are suspended on opposite sides of the longitudinal direction, the first ladder code has a first connecting portion for inserting the first lift cord to be slidable in the vertical direction is combined and engaged with the notch provided in the slats, second ladder cord is vertical the second lift code a second connecting portion which slidably inserted in a direction, at least one of the following features (1) to (2), horizontal blinds are provided. (1) movable ranges second lift cord in the longitudinal direction of the second connecting portion, the first lift code is greater than the movable range in the longitudinal direction of the first connecting portion. (2) the weft of the first ladder code, shorter than the weft of the second ladder code. [0020] The present inventors have, lifting cord is in order to suppress the phenomenon of slats to pull the ladder code would open, at first, simply, tried to increase the size of the coupling loop connecting the lifting cord and the ladder code. This Accordingly, weakening the force of the lift cord pulls the ladder cord, could be suppressed phenomenon slats open. However, increasing the size of the connecting loops, another problem that the slats can be easily displaced in the width direction (hereinafter, "horizontal designated shift ".) has had occurred. As a result of investigating the cause, and the width direction position of the slat is held by engaging the ladder cord to a notch formed in the slat, the coupling loop by increasing the size, the ladder cord is easy to move relative to the lift cord, it has been found that the engagement between the notch and the ladder cord of the slat in order to easily come off. Thus, the prevention of lateral displacement it is not easy to achieve both the opening 3 prevention of slats. [0021] The present inventors have proceeded with further considered in this context, the first ladder cord is engaged with the notch of the slats, the second ladder cord, it is drooping the lifting cord to the other side across the slats, above (1) it has reached the configuration comprises at least one means of (2). According to this structure, in the first ladder cord hardly come off the engagement between the notch and the ladder cord of the slats, and the second in the ladder code, since the opening of the slats is suppressed, open prevention of prevention and the slats of the lateral deviation is compatible. [0022] Hereinafter, various embodiments are illustrated. Various embodiments described below of the present invention can be combined with each other. Preferably, the second ladder cord, said notch of the slats not engaged. Preferably, the notch has a tapered surface extending toward the longitudinal direction outwardly of said slats. Preferably, the one ladder cord includes a plurality of first connecting portion, the first connecting portion 1 or more closer to the headbox, a. (Al) a first lifting cord having at least one characteristic of the following (Al) (B 1) not connected with and first connecting portion is not inserted into the first coupling part. (B 1) first lift cord is connected to the first connecting portion through the and first connecting member is not inserted into the first coupling part. Preferably, the second ladder cord is provided with a plurality of second connecting portions, the one or more second connecting portion closer to the headbox comprises at least one characteristic of the following (A2) ~ (B2). ( A2) The second lift cord is not connected to the and second connecting portions are not inserted into the second coupling part. (B2) second second lift cord through and second connecting member is not inserted into the second coupling part and is connected to the connection portion. Preferably, the first and second ladder cord, respectively, and a plurality of first and second connecting portion has at least one characteristic of the following (a) ~ (b). ( a) In the first connecting portion closest to the head box, the first lift cord is not connected with and first connecting portion is not inserted into the first connecting portion and first connecting portion closer to the second to the headbox So in the first lift cord is connected to the first connecting portion through the and first connecting member is not inserted into the first coupling part. (b) second coupling portion closest to the head box, and the second lifting code is not coupled to the and the second connection portion is not inserted into the second coupling part, the and the headbox in Second nearest second connecting portion, the second lift code and not inserted into the second coupling part to the and it is connected to the second connecting portion through the second coupling member. [0023] According to a third aspect of the present invention, a headbox, a drive shaft for raising and lowering the solar radiation-shielding material by the housed and rotating in the headbox, and the operation section unit for rotating the drive shaft by rotation of the operation pulley, and a operation code to be KakeSo to the operation pulley, the headbox includes an operating cord insertion hole for inserting the operation code, the operation section unit is inserted with the operation code to the operation cord insertion hole was to reduce the interference of the headbox and the operation code in the state provided with the code saving unit that allows sliding movement in the width direction with respect to the headbox, the drive unit is provided for the solar radiation-shielding device. [0024] The present inventors, an operation section unit which includes an operation pulley is configured to be slidably movable relative to the headbox, by providing the operation code insertion hole at a desired position of the head box, the desired width direction of the headbox tried to provide an operation code to the position of. However, in a state of being inserted through the operation code to the operation code insertion hole, will be caught operation cord between the operation section unit and the headbox in a headbox, the operating section and if you had difficulty sliding the unit, strong friction in the operation code when it is slid it has been found that there is a problem that or I joined. [0025] 4 Such newly discovered described problems where was conducted intensive studies to solve, by providing the code saving unit to the operation section unit, it is possible to reduce interference between the operating code and the headbox, whereby, and it found that it is possible to sliding the operation section unit to the head box and led to the completion of the present invention. [0026] Further, according to the present invention, for example, remove the operation section unit by sliding the operating section unit on the right end of the headbox, it is inserted the operation code to the operation cord insertion hole provided in the vicinity of the left end of the headbox slide moved by moving to a predetermined position relative to the headbox of the operation section unit in the state, it is also obtained the effect that the position of the operation section unit from the right side of the head box can be easily changed to the left. [0027] Hereinafter, various embodiments are illustrated. The following embodiments of the present invention may be combined with each other. Preferably, the operation section unit comprises a case for holding a gear for transmitting the rotatable support and the rotation of the operation pulley to the operation pulley to the drive shaft, wherein the case, the operation code in the headbox a facing surface that faces the surface on which the insertion hole is provided, the code saving unit is a gap between the headbox and the facing surface of the case. Preferably, the head box of the headbox having the operation code insertion hole in each of the positions and locations closer to the left edge close to the right end, the case having the code saving unit for each right and left side of the operation pulley. Preferably, the casing has a width in the forward direction, comprising a case cap, gear case, and end caps, wherein the casing cap the operating pulleys between said gear case rotatably supported, and the rotation of the operation pulley between the said gear case end cap transmission gear for transmitting the drive shaft is supported, the code saving unit, the case cap, gear case, and a gap between each of the opposing faces and the head box of the end cap. Preferably, the operating cord insertion holes further comprising a mounting possible code gate, the code gate is a mounted state to said operating cord insertion hole, to disable the sliding movement of the operation section unit engaged with the operation section unit. Preferably said headbox includes a front protruding wall and the rear protruding wall protruding toward the longitudinal direction center of each of the front and rear walls, the operation section unit, a bottom wall of the headbox, said front wall, the rear wall and can be slid in the space surrounded by the front protruding wall and the rear protruding wall. BRIEF DESCRIPTION OF THE DRAWINGS [0028] Brief Description of Drawings of First Aspect of Present Invention Fig. 1 shows a horizontal blind of a first embodiment of a first aspect of the present invention, in which Figs. 1(a) and 1(b) are front views; Fig. 1(c) is a right side view; Fig. 1(b) shows a state in which the front wall of a head box 1 is removed; and Fig. 1(c) shows a state in which a box cap 21 is detached. Fig. 2(a) is a perspective view showing a support member II in Fig. 1 and members housed in the support member 11, and Fig. 2(b) is a perspective view showing details of a tilt spring 24 in Fig. 2(a). Fig. 3 is a perspective view showing the support member II in Fig. 2. Fig. 4 is a perspective view of the support member II in Fig. 2 when seen from another angle. Fig. 5(a) is a perspective view showing a method for fitting an adapter 51 of the support member 11 in Fig. 2; Fig. 5(b) is a bottom view showing a state in which a pulley 53 is inserted to axial holes 5le and 51f formed in the adapter 51; and Fig. 5(c) is a sectional view passing through the center of the axial holes 51 e and 5 If and corresponding to Fig. 5(b). Fig. 6 is a perspective view showing a state in which a cone cap 14 and a winding cone 9 in Fig. 2 are disconnected from each other. Fig. 7(a) is a perspective view showing a state in which a cam clutch 12 and a 5 rotating drum 13 included in an obstacle detection/stop apparatus 10 in Fig. 2 are disconnected from each other; Fig. 7(b) is a view of the rotating drum 13 seen from the cam clutch 12; and Fig. 7(c) is a perspective view showing a state in which the cam clutch 12 and rotating drum 13 are connected together. Fig. 8(a) is a perspective view of the cam clutch 12 and rotating drum 13 in Fig. 7 seen from another angle, and Fig. 8(b) is a perspective view showing the connected cam clutch 12 and rotating drum 13 and the disconnected cone cap 14. Figs. 9(a) to 9(b) are perspective views showing the connected cam clutch 12, rotating drum 13, and cone cap 14. Fig. 10(a) is a view of the rotating drum 13 and cone cap 14 seen from the cam clutch 12; Fig. 10(b) is a view corresponding to Fig. 7(c); Fig. 10(c) is a view corresponding to Fig. 9; and Figs. 10(a) to 10(c) show a state in which a restricting protrusion 13e is adjacent to an engaging protrusion 14c. Fig. 11(a) is a view of the rotating drum 13 and cone cap 14 seen from the cam clutch 12; Fig. 11(b) is a view corresponding to Fig. 7(c); Fig. 11(c) is a view corresponding to Fig. 9; and Figs. 11(a) to 11(c) show a state in which the restricting protrusion 13e is adjacent to an engaging protrusion 14d. Figs. 12(a) to 12(c) are right side views showing states in which slats 3 are being tilted, that is, the slats 3 is making a transition from a fully closed state to a reverse fully closed state with the bottom rail 4 located in the lower limit position and corresponding to Fig. 1(c). Fig. 13 is a perspective view showing that a rotating drum 13 is composed of a first rotating drum 63 and a second rotating drum 73 in a second embodiment of the first aspect of the present invention, in which Fig. 13(a) shows a connected state; and Fig. 13(b) shows a disconnected state. Fig. 14 is a perspective view of the first and second rotating drums 63 and 73 in Fig. 13 seen from another angle. Fig. 15(a) is a perspective view showing the connection structure of the second rotating drum 73, cone cap 14, and first rotating drum 63, and Figs. 15(b) and 15(c) are perspective views of the cone cap 14. Fig. 16 is a perspective view showing the connection structure of a cam clutch 12 and the second rotating drum 73, in which Fig. 16(a) shows a disconnected state; and Fig. 16(b) shows a connected state. Fig. 17(a) is a perspective view showing the connection structure of the cam clutch 12 and second rotating drum 73 seen from another angle, and Fig. 17(b) is a perspective view showing the connection structure of the cam clutch 12, second rotating drum 73, and cone cap 14. Fig. 18 is a perspective view showing the connected cam clutch 12, second rotating drum 73, cone cap 14, and first rotating drum 63. Figs. 19(a) and 19(b) and Figs. 19(c) and 19(d) show a first state and a second state, respectively, of the positional relationship between the first and second rotating drums 63 and 73 and cone cap 14; Figs. 19(a) and 19(c) are sectional views passing through a restricting protrusion 13e of the second rotating drum 73 and engaging protrusions 14c and 14d of the cone cap 14 and seen from the cam clutch 12; and Figs. 19(b) and 19(d) are sectional views passing through a restricting protrusion 63e of the first rotating drum 63 and a restricting protrusion 73d of the second rotating drum 73 and seen from the cam clutch 12. Figs. 20(a) and 20(b) and Figs. 20(c) and 20(d) show a third state and a fourth state, respectively, of the positional relationship between the first and second rotating drums 63 and 73 and cone cap 14; Figs. 20(a) and 20(c) are sectional views passing through the restricting protrusion 13e of the second rotating drum 73 and the engaging protrusions 14c and 14d of the cone cap 14 and seen from the cam clutch 12; and Figs. 20(b) and 20(d) are sectional views passing through the restricting protrusion 63e of the first rotating drum 63 and the restricting protrusion 73d of the second rotating drum 73 and seen from the cam clutch 12. [0029] (Brief Description of the second viewpoint of the drawings of the present invention) [21] according to a first embodiment of the second aspect of the present invention, it is a 6 front view showing an overall configuration of a horizontal blind. [Figure 22] is an enlarged view of a portion surrounded by a dotted line in Fig. [23] Figure 23 (a) is a plan view of a slat 9 in Fig. 21, Fig. 23 (b) is an AA sectional view of FIG. 23 (a), Figure 23 (c), the Figure is an enlarged view of a region X in 23 (a). [Figure 24] Figure 24 (a) ~ (b) is a front view of the first and second ladder cord 5 and 6, Fig. 24 (c) ~ (d), as shown in FIG. 24 (a) ~ (b The first and second in the ladder cord 5, 6 to retain the slats 9 and the connecting portion 5c of the) is a sectional view showing a state of being inserted through the first and second lift codes 13, 14 to 6c. [Figure 25] Figure 25 (a) ~ (b), the slats 9 in a horizontal state, a cross-sectional view through the first and second ladder cord 5, 6. [Figure 26] Figure 26 (a) ~ (b), the slats 9 in a fully closed state is a sectional view through the first and second ladder cord 5, 6. [Figure 27] Figure 27 is, in the horizontal type blind according to the second embodiment of the second aspect of the present invention, is a view corresponding to Figure 22. [Figure 28] Figure 28, in the horizontal type blind in the third embodiment of the second aspect of the present invention, is a view corresponding to Figure 22. [Figure 29] Figure 29 (a) ~ (d) is in a horizontal blind to the fourth embodiment of the second aspect of the present invention, a diagram corresponding to FIG. 24 (a) ~ (d). [Figure 30] Figure 30 (a) ~ (d) is in a horizontal blind according to the fifth embodiment of the second aspect of the present invention, a diagram corresponding to FIG. 24 (a) ~ (d). [Figure 31] Figure 31 (a) ~ (b) is in a horizontal blind according to the fifth embodiment of the second aspect of the present invention, a diagram corresponding to FIG. 26 (a) ~ (b). [0030] (Brief Description of the third viewpoint of the drawings of the present invention) [Figure 32] shows the horizontal type blind in one embodiment of the third aspect of the present invention, (a) ~ (b) is a front view, (c) is a right side view. (B) before the headbox 1 shows a state obtained by removing the wall, (c) shows the state in which remove the box cap 21. [Figure 33] (a), the operation section unit 6 of FIG. 32 is a perspective view of a code gate 15 and the operation code 7 is an exploded view of (c) to (a), (b) and (d ) is a sectional view through the center in the width direction of the code gate 15 in (a) and (c). [Figure 34] (a) is a sectional view through the center of the longitudinal direction of the operation section unit 6 in FIG. 32, (b) is an exploded view of (a). [Figure 35] (a) ~ (c) are, respectively, end cap 6d in the head box 1 in Figure 32, the gear case is shown 6c, and a state where only the case cap 6b are housed. (A) is a left side Figure, (b) and (c) is a right side view. (d) shows a state in which the code gate 15 is engaged with the headbox 1, a sectional view through the widthwise center of the code gate 15 There. (e) is a right side view showing a code gate 15 in the headbox 1 the engagement of the operation section unit 6. (f) is also blind cap 17 is engaged with the headbox 1 It shows a state in which there is a cross-sectional view through the widthwise center of the blind cap 17. [Figure 36] (a) ~ (d) are perspective views showing a procedure for removing the operation section unit 6 attached to the right of the headbox 1 in Figure 32. [Figure 37] (a) ~ (d) are perspective views showing the procedure for attaching the operation section unit 6 on the left side of the headbox 1 in Figure 32. DETAILED DESCRIPTION [0031] Now, various embodiments of the present invention will be described. While embodiments of the first to third aspects of the present invention are described for the sake of convenience, embodiments including two or more features of the first to third aspects are also possible. Accordingly, the embodiments of the first to third aspects of the present invention described below can be combined. For the reference signs, the same reference signs may be given to different elements among the different aspects. [0032] First Embodiment of First Aspect of Present Invention In a horizontal blind serving as a sunlight shielding apparatus shown in Fig. 1, multiple slats 3 serving as a sunlight shielding member are suspended from and supported by a head box 1 through multiple ladder cords 2. A bottom rail 4 is suspended from and 7 supported by the lower ends of the ladder cords 2. [0033] Multiple lift cords 5 are suspended from the head box 1 near the ladder cords 2. The lift cord 5 in the center is suspended before the slats 3 (indoor side), whereas the lift cords 5 on both sides are suspended behind the slats 3 (outdoor side). The upper ends of the lift cords 5 are attached to winding cones 9 disposed in the head box 1, and the lower ends thereof are connected to the bottom rail 4. [0034] Specifically, each lift cord 5 is attached to the corresponding winding cone 9 by hanging knots formed at the upper end thereof on an engaging groove 9d of the winding cone 9. When the winding cone 9 is rotated, the lift cord 5 is wound or unwound and thus the bottom rail 4 and slats 3 are raised or lowered. As shown in Fig. 2(a), the winding cone 9 is rotatably supported by a support member 11 and is rotatable relative to a drive shaft 8. The support member 11 is detachably fixed to the head box 1. Each support member 11 includes an obstacle detection/stop apparatus 10 that detects that the bottom rail 4 has collided with an obstacle during a descent and then stops the rotation of the drive shaft 8. [0035] The two upper ends of each ladder cord 2 are attached to a tilt spring 24 attached to a tilt drum 23. The tilt spring 24 is formed by bending one piece of wire into a loop shape as shown in Fig. 2(b). The tilt spring 24 has ladder cord attachment parts 24al and 24a2 and locking protrusions 24b1 and 24b2 at both ends. The two upper ends of the ladder cord 2 are attached to the two ladder cord attachment parts, 24al and 24a2. The tilt drum 23 is relatively unrotatably supported by the drive shaft 8 in a tilt drum container I1d of the support member 11. When the locking protrusions 24b1 and 24b2 are not in contact with the support member 11, as shown in Fig. 2(a), the tilt spring 24 fastens the tilt drum 23 and rotates integrally with the tilt drum 23. Thus, the angles of the slats 3 are adjusted in phase on the basis of the rotation of the tilt drum 23 through the ladder cords 2. When the tilt drum 23 is rotated in the direction of an arrow XD in Fig. 2(a) to contact the locking protrusion 24b1 with a locking surface 1lh of the support member 11 and then further rotated in the direction of the arrow XD, a force in the direction of an arrow XU in Fig. 2(b) is applied to the locking protrusion 24bl. Thus, the diameter of the tilt spring 24 is increased, and the force with which the tilt spring 24 fastens the tilt drum 23 is reduced. Consequently, the tilt drum 23 idles with respect to the tilt spring 24. When the tilt drum 23 is rotated in the direction of the arrow XU to contact the locking protrusion 24b 1 with the locking surface 11 h of the support member 11 and then further rotated in the direction of the arrow XU, the tilt drum 23 idles with respect to the tilt spring 24 on the same principle. When the slats 3 are rotated to approximately vertical positions, further rotation is prevented on the same principle. [0036] An operation unit 6 is disposed in a position between the right edge and the center of the head box 1 in the width direction. When a loop-shaped operation cord 7 is operated, the operation unit 6 rotationally drives the drive shaft 8 housed in the head box 1, thereby rotating the winding cone 9. The operation unit 6 includes a known self-weight descent prevention apparatus (not shown). When a pull-up of the bottom rail 4 and slats 3 based on an operation of the operation cord 7 is stopped, the self-weight descent prevention apparatus is activated to stop the rotation of the drive shaft 8. Thus, the bottom rail 4 and slats 3 are suspended and supported in desired positions. Subsequently, when the self-weight descent prevention apparatus is deactivated based on an operation of the operation cord 7, the bottom rail 4 and slats 3 descend by their self-weight. [0037] Operation cord insertion holes 13 are formed in positions close to the right and left edges of the head box 1. The operation cord 7 is drawn out of the head box 1 through the right operation cord insertion hole 13 and a cord gate 15. The left operation cord insertion hole 13 is used when moving the operation unit 6 to the left side of the head box 1; when it is not in use, it is covered with a blinding cap 17 as shown in Fig. 1(a). Both edges of the head box 1 are covered with box caps 21. [0038] 8 The winding cone 9, support member 11, and obstacle detection/stop apparatus 10 will be described in detail below. As shown in Fig. 6, the winding cone 9 includes a winding part 9b, a flange 9a disposed at the front end of the winding part 9b, and a connecting part 9c disposed at the base end of the winding part 9b. The connecting part 9c has two engaging grooves 9d. The winding part 9b has a tapered shape that is gradually thinned from the front end toward the base end. Accordingly, the lift cord 5 wound at the front end easily moves toward the base end. The connecting part 9c is not tapered. The connecting part 9c has a cone cap 14 connected thereto. The cone cap 14 includes a flange 14g, a tubular locking part 14e extending from the flange 14g toward the winding cone 9, and a tubular brake part 14f extending in the opposite direction. The tubular locking part 14e has a smaller outer diameter than the tubular brake part 14f. The tubular locking part 14e has two groove engaging protrusions 14a and two connecting protrusions 14b protruding in the outward radial direction. The two engaging grooves 9d are formed in the connecting part 9c at intervals of 180 degrees, and the two groove engaging protrusions 14a and two connecting protrusions 14b are also formed on the tubular locking part 14e at intervals of 180 degrees. The groove engaging protrusions 14a and connecting protrusions 14b are disposed in positions shifted from each other by 90 degrees. [0039] The diameter of an outer circle surrounding the two connecting protrusions 14b is slightly smaller than the inner diameter of the connecting part 9c. By matching the positions of the groove engaging protrusions 14a with the engaging grooves 9d to insert the connecting protrusions 14b into the connecting part 9c, the cone cap 14 and winding cone 9 can be connected loosely. Since the groove engaging protrusions 14a and engaging grooves 9d are engaged with each other in this state, the cone cap 14 and winding cone 9 rotate integrally with each other. However, nothing prevents the cone cap 14 and winding cone 9 from being axially disconnected from each other. Accordingly, in this state, they can be easily disconnected from each other. Note that each connecting protrusion 14b has a tapered surface 14h at the edge thereof in the axial direction. Thus, the connecting protrusions 14b can be easily inserted into the connecting part 9c. [0040] As shown in Fig. 3, the support member 11 includes a winding cone support part 1la for supporting the flange 9a of the winding cone 9 and a cone cap support part 1 lb for supporting the tubular brake part 14f of the cone cap 14. As shown in Fig. 2, when the flange 9a of the winding cone 9 is supported by the winding cone support part 11 a and the tubular brake part 14f of the cone cap 14 is supported by the cone cap support part 11 b with the winding cone 9 and cone cap 14 connected together, the flange 9a is engaged with the winding cone support part 1 a. Thus, the winding cone 9 is prevented from axially moving. Further, the flange 14g contacts a partition 11 c and thus the cone cap 14 is prevented from axially moving in the direction in which the cone cap 14 is disconnected from the winding cone 9. As seen above, when the connected winding cone 9 and cone cap 14 are inserted into the support member 11, the winding cone 9 and cone cap 14 are prevented from being disconnected from each other. As will be described later, the tubular brake part 14f of the cone cap 14 houses a cam clutch 12 and a rotating drum 13, and the support member 11 is provided with a brake protrusion 1 ig that stops the rotation of the drive shaft 8 when engaged with multiple brake nails 12c of the cam clutch 12. [0041] As shown in Fig. 4, the support member 11 has an adapter 51 detachably fitted to the bottom surface thereof. The adapter 51 has a lift cord insertion hole 51 a and a ladder cord insertion hole 51b. The lift cord 5 and ladder cord 2 are introduced into the support member 11 through the lift cord insertion hole 51a and ladder cord insertion hole 51b, respectively, and attached to the winding cone 9 and tilt drum 23, respectively. As shown in Fig. 5(a), the adapter 51 is supported by protrusions 1le protruding from the front and back walls of the support member II toward the center in the front-back direction. Advantages of the use of the adapter 51 as described above include the facilitation of metal molding of the support member 11 and the facilitation of commonality of the support member 11. [0042] 9 The lift cord insertion hole 51a is formed between a partition 51c and a partition 51d, and six sets of axial holes 51e and 51f are formed in the partitions 51c and 51d. By matching the position of the axial hole 53a of a pulley 53 with one set of axial holes 51 e and 5If of the partitions 51c and 51d and inserting a fixing pin 52 into the axial holes, the pulley 53 can be fixed to the adapter 51. While the fixing pin 52 is prevented from easily coming out of the axial hole 51f by press-fitting it into the axial hole 51f, it may be prevented from coming out by other means. As seen above, in the present embodiment, the multiple sets of axial holes 51e and 51f are formed. Thus, it is possible to easily change the fixed position of the pulley 53 in accordance with the width of the slats 3 or to easily change the fixed position of the pulley 53 when reversing left and right sides of the support member 11. The pulley 53 and fixing pin 52 may be fixed to the adapter 51 before inserting the adapter 51 into the support member 11. Thus, the pulley 53 and fixing pin 52 are easily inserted. [0043] Next, the obstacle detection/stop apparatus 10 will be described in detail. The obstacle detection/stop apparatus 10 is composed of the support member 11, cam clutch 12, rotating drum 13, and cone cap 14. [0044] As shown in Figs. 7 to 9, the cam clutch 12 is formed in an approximately cylindrical shape and includes a tubular part 12a and a brake part 12b formed so as to have a larger diameter than the tubular part 12a. The tubular part 12a is inserted into and supported by a cam clutch support hole I If of the support member 11. [0045] The diameter of the outer peripheral surface of the brake part 12b is set to a size such that the outer peripheral surface is slidable on the inner peripheral surface of the tubular brake part 14f of the cone cap 14. The brake part 12b has the brake nails 12c at the end thereof adjacent to the tubular part 12a. The brake nails 12c axially protrude in a sawtooth shape and are engageable with the brake protrusion I ig of the support member 11. [0046] When the brake nails 12c are engaged with the brake protrusion I ig, the cam clutch 12 is prevented from rotating circumferentially. Thus, the support member II and cam clutch 12 can no longer rotate relative to each other. The brake nails 12c are formed along the circumferential direction of the brake part 12b at equal angular intervals (in the present embodiment, two brake nails 12c are formed at intervals of 180 degrees). [0047] As shown in Figs. 7(a) and 8(a), the brake part 12b has, on the side wall thereof, a slide hole 12d and moving slits i2e which serve as a cam structure. The slide hole 12d is formed so as to be inclined with respect to the axis of the brake part 12b by about 68 degrees. The length of the slide hole 12d is set such that the slide hole 12d is formed over an angular range of approximately 120 degrees in the circumferential direction of the brake part 12b. [0048] The moving slits i2e are formed along the axial direction of the brake part 12b. As shown in Fig. 8(b), the moving slits 12e are formed so as to correspond to the positions of engaging protrusions 14c and 14d of the cone cap 14. When the moving slits i2e and engaging protrusions 14c and 14d are engaged with each other, the cam clutch 12 and cone cap 14 are connected together so as to be relatively unrotatable and relatively movable along the axial direction. [0049] When the cam clutch 12 is moved relative to the cone cap 14 in the axial direction of the cone cap 14, the brake nails 12c are engaged with the brake protrusion I ig of the support member 11. Thus, the cam clutch 12 can no longer rotate relative to the support member 11. Subsequently, when the brake nails 12c and brake protrusion I ig are disengaged from each other, the cam clutch 12 can rotate relative to the support member 11. [0050] One [the back side wall in Fig. 8(a)] of the side walls of the brake part 12b circumferentially sandwiching the two moving slits i2e is formed so as to axially protrude further than the other side wall [the front side wall in Fig. 8(a)]. [0051] 10 The drive shaft 8 is inserted in a tubular hole 12f of the tubular part 12a of the cam clutch 12. Since the tubular hole 12f has a larger diameter than a circumcircle of the sectionally rectangular drive shaft 8, the cam clutch 12 is rotatable relative to the drive shaft 8. [0052] As shown in Figs. 7 to 9, the rotating drum 13 is housed radially inside the cam clutch 12. The rotating drum 13 includes a main body 13a and four locking nails 13b. The main body 13a is formed in an approximately cylindrical shape and has a square insertion hole 13c in the center thereof as shown in Fig. 7(b). The drive shaft 8 having a rectangular section of the same size as that of the insertion hole 13c passes through the insertion hole 13c. Thus, the rotating drum 13 rotates integrally with the drive shaft 8. [0053] The four locking nails 13b are formed at equal angular intervals (at intervals of 90 degrees) along the circumferential direction of the main body 13a. The locking nails 13b are formed so as to be elastically deformable toward the center of the tubular locking part 14e of the cone cap 14 when inserted into the tubular locking part 14e. The locking nails 13b are also formed so as to have a smaller diameter than the main body 13a. The main body 13a and locking nails 13b axially sandwich the tubular locking part 14e of the cone cap 14 to prevent the rotating drum 13 and cone cap 14 from axially moving relative to each other. [0054] The main body 13a has two axially formed notches forming an arm 13f. The arm 13f has, at the front end thereof, a slide protrusion 13d protruding in the outward radial direction of the rotating drum 13. The arm 13f is flexible along the radial direction of the rotating drum 13 owing to the notches. When the main body 13a is incorporated into the cam clutch 12, the front end of the arm 13f is bent toward the center along with the slide protrusion 13d. The slide protrusion 13d is formed so as to protrude in an approximately cylindrical shape and also so as to be slidable in the slide hole 12d of the cam clutch 12. [0055] As shown in Fig. 8(a), the main body 13a has, at the edge thereof adjacent to the locking nails 13b, a restricting protrusion 13e protruding in the outward radial direction. The restricting protrusion 13e is disposed in a position approximately opposite to the slide protrusion 13d in the circumferential direction of the main body 13a. The restricting protrusion 13e is formed so as to protrude over a predetermined angular range in the circumferential direction of the main body 13a. The amount of protrusion of the restricting protrusion 13e is set such that the restricting protrusion 13e contacts the engaging protrusions 14c and 14d in the circumferential direction when the rotating drum 13 rotates relative to the cone cap 14. [0056] As shown in Fig. 7(c), the rotating drum 13 thus formed is connected to the cam clutch 12 in such a manner that the slide protrusion 13d is housed in the slide hole 12d of the cam clutch 12. Further, as shown in Figs. 8(b), 10(a), and 11(a), the rotating drum 13 is connected to the cone cap 14 in such a manner that the restricting protrusion 13e is disposed between the engaging protrusions 14c and 14d of the cone cap 14. Accordingly, as shown in Figs. 10(a) and 11(a), the rotating drum 13 and cone cap 14 can move relative to each other only in a range in which the restricting protrusion 13e relatively moves between the engaging protrusions 14c and 14d of the cone cap 14. [0057] Next, operations of the horizontal blind thus configured will be described. First, operations when pulling up the horizontal blind will be described. When the operation cord 7 is operated and thus the drive shaft 8 is rotated in the horizontal blind pull-up direction [in the direction of the arrow XU in Fig. 2(a)], the rotation is transmitted to the rotating drum 13, which is then rotated in the direction of an arrow XU in Figs. 10(a) and 10(b). Thus, the restricting protrusion 13e of the rotating drum 13 moves in the direction of the arrow XU in Fig. 10(a), and the slide protrusion 13d moves in the direction of an arrow YU in Fig. 10(b) along the slide hole 12d. In this stage, the rotation of the rotating drum 13 has yet to be transmitted to the cone cap 14, but rather the rotating drum 13 rotates relative to the cone cap 14. Further, as the slide protrusion 13d moves, a 11 force in the direction of an arrow ZU in Fig. 10(b) is applied to the cam clutch 12. Thus, the cam clutch 12 moves relative to the cone cap 14 in the direction of an arrow ZU in Fig. 10(c). In this state, the amount of protrusion of the brake nails 12c from the tubular brake part 14f is small; the brake nails 12c are yet to be engaged with the brake protrusion 1 Ig of the support member 11; and the cam clutch 12 is rotatable relative to the support member 11. [0058] When the drive shaft 8 is further rotated in the same direction, the restricting protrusion 13e contacts the engaging protrusion 14c. Thus, a force in the direction of the arrow XU in Fig. 10(a) is applied to the engaging protrusion 14c. As a result, the rotating drum 13 rotates integrally with the cone cap 14. Since the cam clutch 12 and winding cone 9 always rotate integrally with the cone cap 14, the rotating drum 13 rotates integrally with the cone cap 14, cam clutch 12, and winding cone 9. The lift cord 5 is wound about the winding cone 9 and thus the bottom rail 4 is raised. [0059] Next, operations when pulling down the horizontal blind will be described. Since the operations when pulling down the horizontal blind are performed using the self-weights of the slats 3 and bottom rail 4, the driving force for pull-down is transmitted from the winding cone 9 to the drive shaft 8. [0060] When a tension is applied to the lift cord 5 on the basis of the self-weights of the slats 3 and bottom rail 4, a force in the direction of the arrow XD in Fig. 2(a) is applied to the winding cone 9. The rotation based on this force is directly transmitted to the cone cap 14 and cam clutch 12, which are then rotated in the direction of an arrow XD in Figs. 10(a) to 10(b). At this point in time, as shown in Fig. 10(a), the restricting protrusion 13e is in contact with the engaging protrusion 14c. Accordingly, the restricting protrusion 13e receives a force in the direction of the arrow XD in Fig. 10(a) from the engaging protrusion 14c, and the rotating drum 13 and drive shaft 8 rotate integrally with the cone cap 14. [0061] When the bottom rail 4 collides with an obstacle or when the bottom rail 4 reaches the lower limit position and thus the load of the bottom rail 4 is applied to the ladder cord 2, the tension applied to the lift cord 5 is reduced. As a result, the force applied to the winding cone 9 in the direction of the arrow XD in Fig. 2(a) is reduced, and the rotation of the winding cone 9 is reduced or stopped. If the rotation of a winding cone 9 has yet to be reduced or stopped in another obstacle detection/stop apparatus 10 disposed in the head box 1, the rotation of the rotating drum 13 and drive shaft 8 in the direction of the arrow XD in Fig. 10(a) becomes faster than that of the cone cap 14 in the obstacle detection/stop apparatus 10 in which the rotation of the winding cone 9 has been reduced or stopped. Thus, the restricting protrusion 13e moves relative to the engaging protrusion 14c in the direction of the arrow XD. At this time, the rotating drum 13 rotates relative to the cam clutch 12 in the direction of the arrow XD in Fig. 10(b). As a result, the slide protrusion 13d moves along the slide hole 12d in the direction of an arrow YD in Fig. 10(b). As the slide protrusion 13d moves, a force in the direction of an arrow ZD in Fig. 10(b) is applied to the cam clutch 12. Thus, the cam clutch 12 moves relative to the cone cap 14 in the direction of the arrow ZD in Fig. 10(c) and becomes a state shown in Figs. 11(a) to 11(c). In this state, the amount of protrusion of the brake nails 12c from the tubular brake part 14f is large; the brake nails 12c are engaged with the brake protrusion 1 Ig of the support member 11; and the cam clutch 12 cannot rotate relative to the support member 11. The cone cap 14 cannot rotate relative to the support member 11. For the rotating drum 13, as shown in Fig. 11(a), when the restricting protrusion 13e contacts an engaging protrusion 14d, the rotating drum 13 can no longer rotate relative to the cone cap 14. As a result, the rotation of the drive shaft 8 is stopped. [0062] In Fig. 12(a), the bottom rail 4 is reaching the lower limit position LL and the obstacle detection/stop apparatus 10 is in operation. The slats 3 are fully closed. The bottom rail 4 is tilted. The locking protrusion 24b 1 of the tilt spring 24 is in contact with the locking surface 1 lh of the support member 11. [0063] 12 When the drive shaft 8 is rotated in the pull-up direction [in the direction of the arrow XU in Figs. 2(a) and 12] in this state, the tilt drum 23 is rotated in the direction of an arrow XU, and the slats 3 become a state shown in Fig. 12(b). When the drive shaft 8 is further rotated, the slats 3 become a reverse fully closed state shown in Fig. 12(c). In the state shown in Fig. 12(c), the locking protrusion 24b2 of the tilt spring 24 is in contact with the locking surface 1 lh of the support member 11. At the same time, when the restricting protrusion 13e of the rotating drum 13 is moved in the direction of the arrow XU in Fig. 11(a) and the slide protrusion 13d is moved in the direction of the arrow YU in Fig. 10(b), the brake nails 12c move in the direction of an arrow ZU in Fig. 11(c), and the brake nails 12c and brake protrusion 1 Ig are disengaged from each other. Thus, the drive shaft 8 becomes rotatable relative to the support member 11. The rotating drum 13 rotates relative to the cone cap 14 until the restricting protrusion 13e contacts the engaging protrusion 14c. Thus, after the drive shaft 8 is rotated by an angle R in Fig. 11(a), the winding of the lift cord 5 is started. On the other hand, the tilt drum 23 rotates integrally with the drive shaft 8. Accordingly, the winding of the lift cord 5 is started later than the tilt of the slats 3 by the angle R. In the present embodiment, the angle R is set to a relatively large angle, for example, 80 degrees or more (preferably 90, 100, 110, or 120 degrees or more). Accordingly, even when the drive shaft 8 is rotated until the slats 3 makes a transition from the fully closed state shown in Fig. 12(a) to the reverse fully closed state shown in Fig. 12(c), the winding of the lift cord 5 is not started. Thus, the height position of the bottom rail 4 in the reverse fully closed state shown in Fig. 12(c) can be kept the same as that in the fully closed state shown in Fig. 12(a). In Patent Literature 1, on the other hand, the angle R is small and therefore the winding of the lift cord is started when the slats are being tilted, that is, the slats are making a transition from a fully closed state to a reverse fully closed state. Consequently, the height position of the bottom rail when the slats are reversely fully closed state would become higher than that when the slats are fully closed and thus light would be leaked from the lower side of the bottom rail. [0064] What should be noted in the present embodiment is that the obstacle detection/stop apparatus 10 is composed of the support member 11, cam clutch 12, rotating drum 13, and cone cap 14. While the winding cone 9 is configured to rotate integrally with the cone cap 14, it is not incorporated in the obstacle detection/stop apparatus. As an element of the obstacle detection/stop apparatus 10, the support member 11 only provides the brake protrusion 1 Ig that stops the rotation of the cam clutch 12 when engaged with the brake nails 12c. Accordingly, it is extremely easy to use a cam unit composed of the cam clutch 12, rotating drum 13, and cone cap 14 with various types of support members 11 or winding cones 9. There are winding cones having different lengths or diameters, and incorporating an element of an obstacle detection/stop apparatus into each of such winding cones requires complicated designs. In the present embodiment, the winding cone 9 is not provided with any special structure except that it is provided with the engaging groove 9d which allows the winding cone 9 to rotate integrally with the cone cap 14. Accordingly, the design is simple. [0065] The above embodiment may be carried out in the following modes. -In the above embodiment, the groove engaging protrusion 14a of the cone cap 14 and the engaging groove 9d of the winding cone 9 are engaged with each other so that the cone cap 14 and winding cone 9 rotate integrally with each other. However, there may be employed other configurations which allow the cone cap 14 and winding cone 9 to rotate integrally with each other. -In the above embodiment, the cone cap 14 and winding cone 9 are not engaged with each other in such a manner that these elements are prevented from being axially disengaged from each other. Accordingly, the cone cap 14 and winding cone 9 are easily disengaged from each other when these elements are not inserted in the support member 11. Alternatively, the cone cap 14 and winding cone 9 may be detachably engaged with each other so that these elements are prevented from being axially disengaged from each other [0066] -In the above embodiment, a horizontal blind is used as a sunlight shielding apparatus, and the obstacle detection/stop apparatus 10 is disposed in the horizontal blind. However, any 13 type of sunlight shielding apparatus may be used as long as it includes a bottom rail and lift cords. Accordingly, a pleated curtain may be used as a sunlight shielding apparatus. A roll up curtain, which uses a weight in place of a bottom rail, may also be used as a sunlight shielding apparatus. [0067] Second Embodiment of First Aspect Referring now to Figs. 13 to 20, a second embodiment of the first aspect of the present invention will be described. The description of elements identical to those in the first embodiment will be omitted as appropriate. [0068] In the first embodiment, the rotating drum 13 is composed of a single rotating drum which rotates integrally with the drive shaft 8. In the present embodiment, as shown in Fig. 13, a rotating drum 13 is composed of a first rotating drum 63 which rotates integrally with a drive shaft 8 and a second rotating drum 73 that is engaged with a cam clutch 12. The second rotating drum 73 includes a main body 13a, a slide protrusion 13d, a restricting protrusion 13e, and an arm 13f, and the functions of these parts are as described in the first embodiment. The second rotating drum 73 also includes a small tubular part 73a extending from the main body 13a toward the first rotating drum 63 and having a smaller diameter than the main body 13a. The small tubular part 73a has a sliding groove 73b that extends circumferentially. The first rotating drum 63 includes a tubular main body 63a, an arm 63b sandwiched between two axially formed notches, and slide protrusions 63c disposed at the front end of the arm 63b and protruding in the inward radial direction. As shown in Fig. 14, the main body 63a of the first rotating drum 63 has a square insertion hole 63f. The drive shaft 8 having a rectangular section of the same size as that of the insertion hole 63f passes through the insertion hole 63f. Thus, the first rotating drum 63 rotates integrally with the drive shaft 8. [0069] The first rotating drum 63 and second rotating drum 73 are connected together as follows: the small tubular part 73a is inserted into the main body 63a and then the slide protrusions 63c are engaged with the sliding groove 73b while bending the slide protrusions 63c in the outward radial direction using the elasticity of the arm 63b. Thus, the first rotating drum 63 and second rotating drum 73 can no longer axially move relative to each other. [0070] As shown in Fig. 14, the second rotating drum 73 is provided with two restricting protrusions 73d protruding from the small tubular part 73a toward the first rotating drum 63 and disposed at intervals of 180 degrees. The tubular main body 63a of the first rotating drum 63 includes two restricting protrusions 63e protruding in the inward radial direction and disposed at intervals of 180 degrees. The restricting protrusions 73d and restricting protrusions 63e are alternately disposed in the same rotation orbit. That is, each restricting protrusion 63e is disposed between the two restricting protrusions 73d. For this reason, when the first and second rotating drums 63 and 73 are rotated relative to each other, the restricting protrusions 73d and restricting protrusions 63e contact each other, thereby preventing further relative rotation of the rotating drums. Accordingly, the first and second rotating drums 63 and 73 can be rotated relative to each other to within a predetermined angular range but cannot be rotated relative to each other when the range is exceeded. [0071] Actually, as shown in Fig. 15, the first rotating drum 63 and second rotating drum 73 are connected together with a cone cap 14 therebetween. In this case, the connection structure is the same as that shown in Fig. 13(a). When the first rotating drum 63 and second rotating drum 73 are connected together with the cone cap 14 therebetween, a locking surface 63d of the first rotating drum 63 and a locking surface 73c of the second rotating drum 73 contact a partition 14j of the cone cap 14. Thus, the cone cap 14 can no longer axially move relative to the first and second rotation drums 63 and 73. In the first embodiment, when the locking nails 13b are engaged with the tubular locking part 14e, the rotating drum 13 can no longer axially move relative to the cone cap 14. In the present embodiment, on the other hand, when the first rotating drum 63 and second rotating drum 14 73 are engaged with each other with the cone cap 14 therebetween, the first and second rotating drums 63 and 73 can no longer move relative to the cone cap 14. [0072] As shown in Fig. 15, the cone cap 14 includes a groove engaging protrusion 14a, a connecting protrusion 14b, engaging protrusions 14c and 14d, a tubular brake part 14f, and a flange 14g. The functions of these parts are as described in the first embodiment. The cone cap 14 also including an insertion tubular part 14i disposed on the side of the flange 14g opposite to the side on which the tubular brake part 14f is disposed. The insertion tubular part 14i houses the first rotating drum 63 and is inserted in the winding cone 9. [0073] As shown in Fig. 16, as in the first embodiment, the cam clutch 12 and second rotating drum 73 are connected together when the slide protrusion 13d of the second rotating drum 73 is engaged with a slide hole 12d of the cam clutch 12. Further, as shown in Fig. 17, as in the first embodiment, when a moving slit 12e and engaging protrusions 14c and 14d are engaged with each other, the cam clutch 12 and cone cap 14 are connected together so as to be relatively unrotatable and relatively movable along the axial direction. [0074] Next, operations of the horizontal blind thus configured will be described. First, operations when pulling up the horizontal blind will be described. When an operation cord 7 is operated and thus the drive shaft 8 is rotated in the horizontal blind pull-up direction [in the direction of the arrow XU in Fig. 2(a)], the rotation is transmitted to the first rotating drum 63, which is then rotated in the direction of the arrow XU in Fig. 19(b). The first rotating drum 63 rotates relative to the second rotating drum 73 until the restricting protrusion 63e of the first rotating drum 63 contacts the restricting protrusion 73d of the second rotating drum 73. Thus, the first and second rotating drums 63 and 73 become a first state shown in Figs. 19(a) and 19(b). When the drive shaft 8 is further rotated in the direction of the arrow XU in Fig. 2(a) in this state, the first and second rotating drums 63 and 73 rotate integrally with each other in the direction of an arrow XU in Fig. 19(a). The first and second rotating drums 63 and 73 rotate relative to the cone cap 14 until the restricting protrusion 13e of the second rotating drum 73 contacts an engaging protrusion 14c of the cone cap 14. Thus, the first and second rotating drums 63 and 73 become a second state shown in Figs. 19(c) and 19(d). When the drive shaft 8 is further rotated in the direction of the arrow XU in Fig. 2 in this state, the cone cap 14 and winding cone 9 rotate integrally with the drive shaft 8, thereby starting to wind the lift cord 5. At this time, the slide protrusion 13d of the second rotating drum 73 is located at a point A in the slide hole 12d of the cam clutch 12 shown in Fig. 16(b). Accordingly, the amount of protrusion of brake nails 12c from the cone cap 14 is small, and the cam clutch 12 is rotatable relative to the support member 11. [0075] Next, operations when pulling down the horizontal blind will be described. Since the operations when pulling down the horizontal blind are performed using the self-weights of slats 3 and a bottom rail 4, the driving force for pull-down is transmitted from the winding cone 9 to the drive shaft 8. [0076] When a tension is applied to the lift cord 5 on the basis of the self-weight of the slats 3 and bottom rail 4, a force in the direction of the arrow XD in Fig. 2(a) is applied to the winding cone 9. The rotation based on this force is directly transmitted to the cone cap 14 and cam clutch 12, which are then rotated in the direction of an arrow XD in Fig. 19(c). At this point in time, as shown in Fig. 19(c), the restricting protrusion 13e is in contact with the engaging protrusion 14c. Accordingly, the restricting protrusion 13e receives a force in the direction of the arrow XD in Fig. 19(c) from the engaging protrusion 14c, and the second rotating drum 73 rotates integrally with the cone cap 14. Further, as shown in Fig. 19(d), the restricting protrusion 63e of the first rotating drum 63 is in contact with the restricting protrusion 73d of the second rotating drum 73. Accordingly, the restricting protrusion 13e receives a force in the direction of an arrow XD in Fig. 19(d) from the engaging protrusion 73d, and the first rotating drum 63 and drive shaft 8 rotate integrally with the second rotating drum 73. As seen above, the rotation of the winding cone 9 is transmitted to the 15 cone cap 14, second rotating drum 73, first rotating drum 63, and drive shaft 8 in this order, and all these elements rotate integrally with one another. [0077] Next, there will be described operations when the bottom rail 4 collides with an obstacle or when the bottom rail 4 reaches the lower limit position and thus the rotation of the winding cone 9 is reduced or stopped. When the rotation of the winding cone 9 is reduced or stopped and thus the rotation speed of the drive shaft 8 becomes higher than that of the winding cone 9, the restricting protrusion 63e of the first rotating drum 63 moves relative to the restricting protrusion 73d of the second rotating drum 73 in the direction of the arrow XD in Fig. 19(d). Thus, the first and second rotating drums 63 and 73 become a third state shown in Figs. 20(a) and 20(b). When the drive shaft 8 is further rotated in the direction of the arrow XD in Fig. 2(a) in this state, the first and second rotating drums 63 and 73 rotate integrally with each other in the direction of an arrow X in Fig. 20(b). Thus, the first and second rotating drums 63 and 73 become a fourth state shown in Figs. 20(c) to 20(d). At this time, the slide protrusion 13d of the second rotating drum 73 moves from the point A to a point B in the slide hole 12d of the cam clutch 12 shown in Fig. 16(b). Thus, the cam clutch 12 moves in the direction in which it is disengaged from the cone cap 14. As a result, the amount of protrusion of the brake nails 12c from the cone cap 14 is increased; the brake nails 12c are engaged with the brake protrusion 1 Ig of the support member 11; and the cam clutch 12 can no longer rotate relative to the support member 11. The cone cap 14 can no longer rotate relative to the support member 11. As shown in Fig. 20(c), when the restricting protrusion 13e contacts an engaging protrusion 14d, the second rotating drum 73 can no longer rotate relatively. As a result, the first rotating drum 63 can no longer rotate relative to the support member 11, thereby stopping the rotation of the drive shaft 8. [0078] When the drive shaft 8 is rotated in the pull-up direction [in the direction of the arrow XU in Fig. 2(a)] in this state, the restricting protrusion 63e of the first rotating drum 63 moves in the direction of the arrow XU in Fig. 20(d), and the first rotating drum 63 rotates relative to the second rotating drum 73 by an angle S. Thus, the restricting protrusion 63e contacts the restricting protrusion 73d, and the first and second rotating drums 63 and 73 become the first state shown in Figs. 19(a) and 19(b). When the drive shaft 8 is further rotated in the direction of the arrow XU in Fig. 2(a) in this state, the first and second rotating drums 63 and 73 rotate integrally with each other in the direction of the arrow XU in Fig. 19(a), and the second rotating drum 73 rotates relative to the cone cap 14 by an angle R. Thus, the restricting protrusion 13e contacts the engaging protrusion 14c, and the first and second rotating drums 63 and 73 become the second state shown in Figs. 19(c) and 19(d). When the drive shaft 8 is further rotated in the direction of the arrow XU in Fig. 2(a) in this state, the first and second rotating drums 63 and 73 rotate integrally with the cone cap 14 and winding cone 9, thereby starting to wind the lift cord 5. [0079] In the present embodiment, the angle R shown in Fig. 19(a) is smaller than the angle R in the first embodiment shown in Fig. 11(a). The reason why such a design is made is as follows. In the present embodiment, the second rotating drum 73 and first rotating drum 63 can rotate relative to each other. Accordingly, the rotation transmitted from the drive shaft 8 to the first rotating drum 63 is transmitted to the second rotating drum 73 with a delay corresponding to the angle S shown in Fig. 20(d); the rotation of the second rotating drum 73 is transmitted to the cone cap 14 and winding cone 9 with a delay corresponding to the angle R; and then the winding of the lift cord 5 is started. Thus, after the drive shaft 8 is rotated by the angle S plus the angle R, the winding of the lift cord 5 is started. As a result, even when the angle R is smaller than that in the first embodiment, it is possible to prevent an ascent of the bottom rail 4 during a tilt operation. To effectively prevent an ascent of the bottom rail 4 during a tilt operation, the angle S plus the angle R is preferably 80 degrees or more (more preferably 90, 100, 110, or 120 degrees or more). [0080] The present embodiment may be carried out in the following modes. 16 -One or more drums may be further disposed between the first rotating drum 63 and second rotating drum 73 so that the rotation is transmitted to the adjacent drums with delays corresponding to predetermined angles. Thus, the amount of delay of the rotation transmission from the drive shaft 8 can be further increased. [0081] Other Embodiments of First Aspect In another embodiment of the first aspect of the present invention, the start of the winding of the lift cord 5 is prevented when the slats 3 are being tilted with the bottom rail 4 located in the lower limit position, as shown in Fig. 12. Thus, there is accomplished the object of preventing the leakage of light by preventing the lower limit position of the bottom rail 4 from varying between when the slats 3 are fully closed and when the slats 3 are reversely fully closed. This object is accomplished by setting, to 80 degrees or more, an angle V until the winding cone 9 starts to rotate after an obstacle detection/stop apparatus 10 is activated to rotate, in the pull-up direction, the drive shaft 8 whose rotation is stopped [the state shown in Fig. 11 in the first embodiment; the fourth state shown in Figs. 20(c) and 20(d) in the second embodiment]. In this embodiment, the obstacle detection/stop apparatus 10 need not necessarily be an element different from a winding cone 9. As in Patent Literature 1, the winding cone 9 may be part of the obstacle detection/stop apparatus 10. [0082] The upper limit of the angle V is not limited to a particular angle. However, too large an angle V would reduce the obstacle detection accuracy. For this reason, the upper limit is, for example, 300 degrees. More specifically, the angle V is, for example, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, or 300 degrees, or may be between any two of the values presented. [0083] The present embodiment of the first aspect provides a sunlight shielding apparatus. The sunlight shielding apparatus includes a head box, a sunlight shielding member suspended from and supported by the head box, a lift cord configured to raise or lower the sunlight shielding member, a winding cone disposed in the head box and configured to wind and unwind the lift cord, a drive shaft configured to rotate the winding cone, and an obstacle detection/stop apparatus configured to, when the sunlight shielding member is lowered, detect a reduction in a tension applied to the lift cord and to stop rotation of the drive shaft. When the drive shaft whose rotation has been stopped by the obstacle detection/stop apparatus is rotated in a direction in which the sunlight shielding member is pulled up, an idle angle V from when rotation of the drive shaft is started to when rotation of the winding cone is started is 80 degrees or more. Preferably, the sunlight shielding apparatus is a horizontal blind. Preferably, the sunlight shielding member is vertically arranged multiple slats. Preferably, the sunlight shielding apparatus further includes a tilt mechanism configured to rotate integrally with the drive shaft and to change a tilt angle of the slats. Preferably, the tilt mechanism includes a tilt drum configured to rotate integrally with the drive shaft, a tilt spring attached to the tilt drum, and a ladder cord configured to support the slats and having an upper end attached to the tilt spring. [0084] (First embodiment of the second aspect of the present invention) With reference to FIG. 21 to 26, it will be explained horizontal blinds of the first embodiment of the second aspect of the present invention. From the head box 3 of the lower surface 3a, the first and second ladder cord 5 and 6 are suspended. Ladder cord 5 and 6, respectively, a pair of warp yarns 5a, a plurality of pairs of weft yarns 5b between 6a, and 6b provided. in the ladder at the lower end of the cord 5, 6 bottom rail 7 is attached. each pair of weft 5b of the ladder cord 5, 6, the slats 9 is supported to the 6b. 21, 10 sheets Although the slats 9 are supported, the number of slats 9 are blind height, width of the slats 9, and is determined appropriately, such as by the spacing between the slats 9 of each stage. in the present embodiment, the slats 9 , which is a wooden slats of comparatively thick, the thickness and material of the slats is not particularly limited. [0085] From the head box 3 of the lower surface 3a, the first and second lift codes 13 and 14, 17 across the slats 9 are suspended on opposite sides of the longitudinal directions. Lift cords 13 and 14, respectively, ladder cord 5 and it is suspended from the front and rear direction outside than 6. [0086] The first ladder cord 5 has a first coupling portion 5c which slidably is inserted vertically a first lift code 13 and the notch first lift code 13 is provided on the slats 9 in a side to be suspended 9a is engaged in. The second ladder cord 6 has a second connecting portion 6c for inserting the second lift code 14 to be slidable in the vertical direction, the notches of the slats 9 is not engaged. connecting portion 5c , 6c is, for example a small ring, called pico, it need not necessarily has the ring shape, the lifting cord 13, 14 slidably intended to be connected in the vertical direction with respect to the ladder cord 5, 6 Bayoi. coupling portion 5c, the position and pitch of providing the 6c, the lifting cord 13 and 14 is not particularly limited as long as it is possible properly connected to the ladder cord 5 and 6, the connecting portion 5c, 6c are, in each slat 9 may be provided in the corresponding position, may be provided in a skip slat one skip or more. In addition, there is no particular limitation on the positional relationship of the connecting portion 5c, 6c and slat 9, the height of the connecting portion 5c, providing a 6c position may be either of the upper and lower sides of the slats 9 may have a height comparable with the slats 9. [0087] In addition, the connecting portion 5c, 6c is arranged slightly below the positions from each slat 9. Connecting portion 5c to such a position, by placing the 6c, effect a lateral displacement of the slats 9 during the convolution It can be prevented. as a principle, when the convolution of the slats 9, but ladder cord 5, 6 from the bottom in this order by the rise of the bottom rail 7 is gradually convoluted meandering, tension is applied at the time of convolution fixed coupling portion 5c to lift code 13, 14, 6c is the effect, such as to fix the slightly pre-position of the ladder cord 5 and 6 by located on the lower side occurs than the slats 9, thereby slat 9 There will convoluted without lateral displacement. [0088] In the present embodiment, among the three ladder cord, a first ladder cord 5 that two of engagement with the notch 9a at both ends, it is one of the central but not-out 9a engages the notch a second ladder cord 6 is not limited to such a configuration, two at both ends but a second ladder cord 6 to 9a engages notch, one of the center may be the first ladder cord 5 is engaged with the notch 9a . the number of ladder cord is not limited to three, and may be four or five such. If the number of ladder cord is four, for example, two at both ends are at the first ladder cord 5 , or two of the center is the second ladder cord 6, and the arrangement of the opposite. also, the first ladder cord 5 the second ladder cord 6 may be arranged alternately. Furthermore, the lifting cord, all ladder need not be located adjacent to the coding, there may be a ladder cord that is not the lifting cord and the pair. [0089] As shown in Figure 23, the notch 9a, according to the back and forth with a tapered surface 9b extending toward the outward direction. The configuration of the slats 9, when included slat mat, the first ladder cord 5 is in the widthwise direction even if the lateral displacement in the width direction of the slat is caused by fluctuation, less off the weft 5b and the first ladder cord 5 notches 9a, even if it had come off even, weft 5b and the first ladder cord 5 is cutaway in order to be pulled back by the tapered surface 9b of 9a, easily engaged again and weft 5b and the first ladder code 5 notches 9a. as a result, the lateral deviation of the slats is suppressed. [0090] As shown in Figure 24, the size of the second connecting portion 6c is larger than the first connecting portion 5c. Therefore, the second lift code 14 is movable in the longitudinal direction by the second connection part 6c range, the 1 lifting cord 13 is greater than the movable range in the longitudinal direction in the first connecting portion 5c. According to such a configuration, as later described in detail with reference to Figure 26, in the fully closed state, the distance between the first lift code 13 of the first ladder cord 5, a second lift cord 14 becomes shorter than the distance between the second ladder cord 6. Therefore, the weft 5b and the first ladder cord 5 off engagement oysters 9a is unlikely to be released, and the force is the second lift cord 14 pulls the warp 6a of the second ladder code 6 is weak, I 18 due to the fact that the ladder cord is pulled to the lifting cord in the fully closed state of the slat 9 lowering of shielding property is suppressed. [0091] In addition, as shown in Fig. 24 (a) ~ (b), the weft 5b of the first ladder cord 5 is slightly shorter than the weft 6b of the second ladder cord 6. According to this structure, as shown in Figure 24 (c), the cross-section 5d of the pair of weft 5b, can be easily held in the warp 5a notches 9a. Note that it crosses the pair of weft 5b it is arbitrary, pairs in the meantime the slats 9 without crossing the weft 5b may be inserted. also, the weft 5b of the first ladder cord 5 may be the same length as the weft 6b of the second ladder cord 6. in this If, warp 5a, since easily disengaged from the notch 9a, is preferably disposed in the notch 9a of the cross section 5d. it may not be allowed to even crossed the pair of weft 6b of the second ladder cord 6 but, it is preferable if you are cross section 6d is, because the follow-up of the slat 9 with respect to the movement of the weft 6b is improved. [0092] As shown in Figure 25, in this embodiment, the lift cord 13 and 14, lifting cord guide part respectively provided on the front side and rear side of the head box 3: is positioned in (Example pulley) 19 and 20 take-up drum 2 1a, and it is adapted to be wound on 2 1b. In this configuration, the winding drum 21a, by rotating the 21b, changing the lifting cord length between the head box 3 and the bottom rail 7 and a bottom The rails 7 can be raised and lowered. vol and up drum 21a, 21b, by rotating the drive shaft 22, a method of rotating the. drive shaft 22 can be rotated is not particularly limited, the drive shaft 22 by KakeSo the operation code to the non-rotatably fixed pulley, the operation code may rotate the drive shaft 22 by rotating the pulley by pulling, and rotates the drive shaft 22 using the electric motor may. In the present invention, the lifting means is not limited to the winding drum of the lifting means as shown in Figure 25, the head of the lifting cord 13 inserted into the head box 3 through the lifting cord guide part 19 The drawn from different locations of the box 3, a lifting and lowering the bottom rail 7 by varying the extraction amount, so-called, and may be a lifting means straight pull type. [0093] In Figure 25, the end of the headbox side warp 5a of the ladder cord 5, 6. Suspension ring is attached to the suspended ring (not shown) which is rotated by the drive shaft 22 a predetermined movable range is rotated by the inner, warp 5a this rotation, one 6a is pulled in the direction of arrow X, and the warp 5a, the other 6a is the slats 9 by drop to the direction of the arrow Y and is tilted as shown in Figure 26 Te, it is in the fully closed state. [0094] Warp 5a of the ladder cord 5,6, 6a are therefore located inside the front and rear direction than the lift cords 13 and 14, in the fully closed state as shown in Figure 26, the warp 5a, the 6a and the front and rear outwardly force acts strongly, the slats 9 are shielding property tends to deteriorate open. However, in this embodiment, since the size of the second connecting portion 6c is relatively large, as shown in FIG. 26 (b), second ladder open the distance between the warp yarns 6a and the second lift codes 14 in the cord 6, yet as shown in FIG. 26 (a), by the ladder cord 5, 6 and the slats 9 are closer to the first lift code 13, the ladder code 5 and 6 is relaxed force in the longitudinal direction outward to receive the lift cords 13 and 14, the opening of the slats 9 is reduced, thereby improving the shielding property. [0095] By the amount the size of the second connecting portion 6c is large, the warp yarns 6a of the second ladder cord 6, second it is for the lifting cord 14 tends to move in the width direction, the second ladder cord 6 relates to the notch 9a since combined if not, no problem spreads the movable range in the width direction. on the other hand, the size of the first connecting portion 5c is relatively small, warp 5a of the first ladder cord 5, the width for the first lift code 13 movable range of directions is small, it is not easily disengaged state of the weft 5b and the first ladder cord 5 and the notch 9a. With the above configuration, the opening prevention of prevention and the slats of the lateral displacement is achieved. [0096] The present invention can also be implemented in the following forms. 19 -Notch 9a is, one side of the slat 9 from the point of view of the light-shielding (for example, the room outside), but it is preferable to provide the only, both sides of the slat 9 (for example, the room outside the room inside) may be provided. In this case, it is possible to engage the notch 9a of the both sides of the slats 9 on the first ladder cord 5. In the above embodiment, the notch 9a and the first lift code 13 are disposed on the same side of the slat 9, the first lift code 13 and the notch 9a is disposed on the opposite sides across the slats 9 that may be. - If the first ladder cord 5 is plurality in at least one of them, the size of the first connecting portion 5c is sufficient if smaller than the second connection part 6c. In at least one of the first ladder cord 5 , when the engagement state of the first ladder cord 5 and the notch 9a is Nikukere is released, it is because it is possible to prevent lateral displacement of the slats 9. In the foregoing embodiment, the second ladder cord 6 is not engaged with the notch 9a of the slat 9, provided on one side (the same side or opposite side of the second lift code 14) or both sides of the slats 9 It may be engaged with the notch. In the above embodiment, although retaining the slats 9 between a pair of weft 5b, each slat 9 may be supported by a single weft 5b. [0097] (Second embodiment of the second aspect of the present invention) Next, with reference to FIG. 27, a description will be given of horizontal blinds of the second embodiment of the second aspect of the present invention. As shown in Figure 27, in this embodiment, the connecting portion 5c which is arranged so as to correspond to the uppermost slat 9, in the 6c lifting cord 13 is not inserted, corresponding to the slats 9 of the two-stage The coupling portion 5c, 6c which are disposed Te, connecting portions 5c, the 6c, spiral extension member 5e, 6e is inserted, the extension member 5e, the lift cords 13, 14 to 6e are inserted. three In the stage subsequent coupling portion 5c as in the first embodiment, the lift cord 13, 14 is inserted in 6c. The reason for adopting such a configuration, several connecting portions 5c closer to the headbox 1 In 6c, warp 5a of the lifting cord 13 and 14 ladder code 5 and 6, there is a particularly strong force to pull 6a to the longitudinal direction outside, the connecting portion 5c and the elevating code 13,14, 6c and to completely separate or extension member 5e, the connecting portion 5c and the lifting cord 13, 14 through 6e, by concatenating 6c, warp 5a by lift cords 13 and 14, in order to suppress the tension 6a. Moreover, the extension member 5e, With 6e, connecting portion 5c and the lifting cord 13, it is possible to reduce the friction between the 6c, it is possible to enhance the durability of the connection portion 5c, 6c. [0098] Thus, the lift cord 13 and 14, not all of the connecting portions 5c, there is no need to be inserted to 6c, also, the connecting portion 5c, connecting the 6c and lifting cord 13, 14 through extension member 5e, and 6e in may be. in addition, the extension member 5e, 6e, the connecting portion 5c, may be used only in one of 6c, through the closest connection portion 5c to the head box 1, also extending member 5e in 6c, the 6e connecting portion 5c and the lifting cord 13, 14 may be connected to 6c. [0099] (Third embodiment of the second aspect of the present invention) Next, with reference to FIG. 28, a description will be given of horizontal blinds of the third embodiment of the second aspect of the present invention. In this embodiment, the connecting portions 5c, 6c are disposed slightly below the first embodiment as well as slats 9. In addition, the nearest connecting portion 5c to the headbox 1, 6c is extension member 5e, via 6e it is connected to the lifting cord 13 and 14. in such an embodiment, the lateral displacement preventing effect of the slats 9, the connecting portion 5c, the durability improvement effect of 6c is obtained. [0100] (Fourth embodiment of the second aspect of the present invention) Next, with reference to FIG. 29, a description will be given of horizontal blinds of the fourth embodiment of the second aspect of the present invention. In this embodiment, the connecting portion 5c, 6c, each weft 5b, 6b at the same position in the height, that is positioned at a height the same position as each slat 9. With this configuration, the side of the slat 9 deviation can be effectively suppressed. As a 20 principle, when the convolution of the slats 9, ladder cord 5 and 6 will be folded meandering in order from the bottom by an increase of the bottom rail 7. lifting cord 13 tension is applied to. slat 9 and connecting portion 5c in the same position, and 6c is present, the connecting portion 5c which tension is applied to the lift cord 13 and 14, without the connecting portion 5c, is 6c of the position displaced by 6c fixed because of the slats 9 in position at the same position, lateral displacement of the slats 9 is suppressed. It should be noted that only the connecting portion 5c is disposed at a height the same position as each slat 9, the connecting portion 6c is, Slightly may be disposed on the lower side or upper side of the slat 9. [0101] (Fifth embodiment of the second aspect of the present invention) Next, with reference to FIGS. 30 to 31, description will be given horizontal blinds of the fifth embodiment of the second aspect of the present invention. As shown in Figure 30, in this embodiment, the size of the first connecting portion 5c and the second connection part 6c are substantially the same, the length of the weft 6b of the second ladder cord 6 is first ladder cord have become 1. 1 times the length of 5 weft 5b. L2 / LI is, for example, from 1.1 to 2, preferably 1.2 to 1.5. When the L2 is too large function of holding the slats 9 are too low. [0102] As shown in Figure 31, in this embodiment, the distance between the warp yarns 6a and the second lift code 14 of the second ladder cord 6 is not spread, slats 9 held by the weft 6b of the second ladder cord 6 since the movable range in the longitudinal direction is large, the slats 9 approaches the first lift code 13, the ladder cord 5, 6 is relaxed force in the longitudinal direction outward to receive the lift cords 13, 14 are reduced opening of the slats 9 it has been to improve the shielding property. [0103] (One embodiment of the third aspect of the present invention) Horizontal blinds as solar radiation shielding apparatus shown in Fig. 32, the multiple stages of the slat 3 as a solar radiation shielding material is suspended supporting via a plurality of ladder cord 2 which is suspended from the head box 1, of the ladder cord 2 bottom rail 4 is hanging support at the lower end. [0104] In the vicinity of the ladder code 2, is droop plurality of lifting cord 5 from the head box 1, the center of the lifting cord 5 is suspended in front of the slat 9 (room inside), the lifting cord 5 at both ends, the slats 9 are the drooping on the rear side (the room outside). lifting cord 5 its upper portion is wear take-up shaft 9 wound disposed in the head box 1, the lower end is connected to the bottom rail 4 . [0105] Lifting cord 5, based on the rotation of the winding shaft 9, are made winding or rewinding, the bottom rail 4, and the slats 3 are lifting on the basis of the rotation. The rotation of the take-up shaft 9 based on the, through the ladder cord 2 each slat 3 is angular adjusted in phase. Note that, when the slat 3 is rotated substantially until the vertical direction, so as not be further rotated. Vol up shaft 9 is rotatably supported by the support member 11, support member 11 is detachably secured to the headbox 1. [0106] The widthwise center of the position of the right end of the headbox 1 operation section unit 6 is provided, a drive shaft 8 which is housed in the head box 1 on the basis of the operation of the loop operation code 7 rotating drivable is, the take-up shaft 9 is rotated based on the rotation of the drive shaft 8. [0107] The position close to the position and left close to the right edge of the head box 1 is the operation code insertion hole 13 is provided, respectively, in the right side of the operation code insertion hole 13, outside operation code 7 of head box 1 through the code gate 15 and is derived. in addition, the left side of the operation cord insertion hole 13, as described later, it is intended to be used when moving the operation section unit 6 on the left side of the headbox 1, Figure 32 when not in use As shown in (a), are. Both ends of the head box 1 is closed by blind caps 17 is closed box cap 21. 21 [0108] The following, it will be described in detail the operation section unit 6 and the code gate 15. As shown in FIGS. 33 to 34, the operation section unit 6, an operation pulley 6a, the operation pulley 6a operation code 7 is KakeSo. Operated pulleys 6a, during the case cap 6b and the gear case 6c When rotating the rotatably supported by. operation code 7 operating pulleys 6a by operating, its rotation is transmitted to the drive shaft 8 through a transmission gear accommodated between the gear case 6c and the end cap 6d. transmission gear configuration of is not particularly limited, for example, a planetary gear mechanism for decelerating the rotation of the operation pulley 6a is transmitted to the driving shaft 8. the planetary gear mechanism, in the example of FIG. 34, rotating the operation pulley 6a integrally gears among which meshing with the sun gear 6f, the planet gear 6g provided around the sun gear 6f, the carrier 6h which rotatably and revolvably supports the planetary gears 6g, a and planet gear 6h formed on the inner surface of the gear case 6c to consists 6i. The operation rotation of the pulley 6a is converted into rotation of the carrier 6h, rotation of the carrier 6h is transmitted to the drive shaft 8 via a clutch unit 6e. clutch unit 6e includes a bottom rail 4 of and a function of transmitting smoothly to the drive shaft 8 to rotate the operating pulleys 6a while preventing rotation of the drive shaft 8 by its own weight. [0109] As shown in Fig. 35 (a) ~ (c), the head box 1 is provided with a front projecting wall Ic and the rear protruding wall Id extending from each of the front wall la and rear wall lb toward the center in the longitudinal direction, operation section unit 6, a bottom wall le, a front wall la, the rear wall 1b, is slidably accommodated in a space If surrounded by front projecting wall Ic and the rear protruding wall Id. In this state, the case cap 6b The top rib 6b1,6b2, the top rib 6c1,6c2 of the gear case 6c, is a state upper surface of each protruding wall 1d, contact or contact with nearly equivalent to the lower surface of the le of the upper ribs 6d1,6d2 of end cap 6d, and case cap 6b Since the longitudinal direction the outer surface of the bottom rib 6b3,6b4 and gear case 6c lower rib 6c3,6c4 of there is in contact or near contact with each state on the inner surface of the front wall la and a rear wall lb of the head box 1, the operating unit Unit 6, without rattling, it is slidable in the width direction in the headbox 1. In addition, a gap GI is provided between the front wall la of the front 6b5 and the head box 1 of the case cap 6b, gear case gap G2 is provided between the front wall la of the front 6c5 and the head box 1 of 6c, between the front wall la of the front 6d5 and the head box 1 of the end cap 6d gap G3 is provided. gap GI ~ G3 are as described later, when the operation section unit 6 with respect to the head box 1 and is slid in a state of being inserted through the operation code 7 on the operation code insertion hole 13, while the operation code 7 and the head box 1 and functions as the code saving unit for reducing interference. [0110] As shown in Figure 33, the code gate 15, and includes a code gate body 15a, and a code division 15b, and a pulley 15c. Code division 15b is a left-right symmetrical shape, a projection 15bi on both sides in the width direction. The by engaging the engaging groove 15d which is provided a projection 15b 1 at substantially the center in the vertical direction of the code gate body 15a,. pulley 15c to code division 15b is engaged capable engaged releasably on the code gate body 15a is left is a symmetrical, has a projection on both sides in the width direction. pulley 15c which are engaged with the engaging groove 15e provided at the lower part of the protrusion code gate body 15a is allowed once engaged in the engaging groove 15e after, it is not necessary to be removed, the pulley 15c is normally fitted as not to engage releasably the engaging groove 15e. [0111] Operation code 7u from the upper exit of the operation pulley. 6a, and code division 15b, passes between the upper guide wall 15f of the code gate body 15a, operation code 7b from the lower exit of the operation pulley. 6a, and code division 15b passes between the pulley 15c. Thus, the operation code 7u, 7b is the code division 15b, it is separated into upper and lower. the operation code 7u, 7b, when there is no need for distinction, "operation code 7 It referred to as [0112] 22 In addition, the code gate body 15a is provided with a lower engagement groove 15h at the tip of the lower protruding piece 15i, includes a set of pin insertion holes 15g on the top, as shown in Fig. 35 (d), operating cord insertion hole 13 The bottom wall front end engaged with the lower engaging grooves 15h to 13a, and a set pin insertion holes 15g in a state of being protruded into the head box 1, inserting a set pin 19 to set the pin insertion holes 15g in the headbox 1 by making, in a state where the code gate 15 has engaged the. lower engagement groove 15h, which is fixed to the head box 1 to the bottom wall front end 13a, as shown in FIG. 33 (a) and Figure 35 (e), lower protruding piece 15i of the code gate body 15a is sandwiched between the lower ribs 6c3 of the lower rib 6b3 and gear case 6c of the case cap 6b. In this state, the lower projecting piece 15i is to interfere with the lower rib 6b3,6c3, sliding movement of the operation section unit 6 becomes a non-operation section. blindfold cap 17 whose position is fixed stably in the unit 6, as shown in Fig. 35 (f), engaged with the operating cord insertion hole 13 that. [0113] Then, we will explain how to move to the left the position of the operation section unit 6 from the right side of the head box 1. First, as shown in Figure 36 (a) ~ (b), the right side of the headbox 1, detached box cap 21, the set pin 19, a code gate 15 from the headbox 1. Figure 33 (a) and (c) As shown in, and pull the set pin 19 from the set pin insertion holes 15g, you can remove a code gate 15 from the head box 1, and remove the code division 15b from the code gate body 15a, and encodes the gate main body operation code 7 and it can be pulled out 15a. Next, as shown in Figure 36 (c), the operation section unit 6 by making the operation section unit 6 with respect to the head box 1 is slid and detached from the head box 1. In this case, operation code 7, the gap G2 , so retracted to G3, without operation code 7 interfere strongly with the headbox 1, thereby sliding the operating section unit 6 smoothly. Then, as shown in Fig. 36 (d), operation code 7 The pull from the operation code insertion hole 13, to close the operation code insertion hole 13 using a blind cap 17, and attaching the box cap 21. [0114] Next, as shown in Fig. 37 (a), the left side of the headbox 1, and remove the box cap 21 and the blind cap 17. Next, as shown in Figure 37 (b), the left side of the operation of the headbox 1 inserting the operation code 7 the cord insertion hole 13. In this state, as shown in Figure 37 (c), the position of the operation section unit 6 operation is fitted to the head box 1 pulley 6a is operated cord insertion hole 13 until comes to the operation section unit 6 and is slid relative to the head box 1. In this case, operation code 7 is so retracted to the gap G 1, without operation code 7 interfere strongly with the headbox 1, the operation unit thereby sliding the unit 6 smoothly. Then, as shown in Figure 33 (b) and (d), it is inserted through the operation code 7 in the opening code gate body 15a, from the upper outlet of the operation pulley 6a The operation code 7b of the operation code 7u and lower outlet of to separate up and down, by mounting a code division 15b for encoding the gate body 15a, and the state of FIG. 37 (c). Next, Figure 37 ( As shown in d), engaging the cord gate 15 to the operation code insertion hole 13, as shown in FIG. 33 (a) and (c), by inserting the set pin 19 to set the pin insertion holes 15g, Code gate 15 is fixed to the headbox 1. Consequently, the operation section unit 6 is slid immovable relative to the head box 1. Thereafter, by mounting the box cap 21, completing the movement of the operation section unit 6 to. [0115] The invention can be implemented in the following embodiments. In pleated screen or Roman shades or the like having an operation section unit in the head box can be applied. Code using the gate 15 non-members, the operation section unit 6 may be allowed to slide immovable relative to the head box 1. And operation unit are provided from the unit 6 a retractable part in the operation section unit 6, the part by engaging the like headbox 1 and code gate 15, the sliding movement disables the operation section unit 6 with respect to the head box 1 It may be in. The number of-operation code insertion hole 13 may be one. In this case, it is not possible to position the operating section unit 6 moves, the effect that can be easily replaced when the operation section unit 6 fails can get. 23 - Operation code insertion hole 13, one side may be provided two or more headboxes 1. In this case, according to the preferences of the user, it is possible to change the position of the operation code 7. Description of Reference Signs [0116] Description of Reference Signs in First Aspect of Present Invention 1: head box 2: ladder cord 4: bottom rail 5: lift cord 9: winding cone 11: support member 1 Ig: brake protrusion 12: cam clutch 13: rotating drum 14: cone cap 23: tilt drum [0117] (Description of the sign of the second aspect of the present invention) 3: head box 5: first ladder code 6: the second ladder code 5a, 6a: warp 5b, 6b: weft 5c, 6c: connecting part 7: the bottom rail 9: slat 9a: notch 13: first lifting code 14: the second lift code [0118] (Description of the sign of the third aspect of the present invention) 1: Head box 6: operation section unit 7: Operation code 8: drive shaft 13: Operation code insertion hole 15: Code gate 24

Claims

1. A cam unit comprising: a cone cap that is detachably engaged with a winding cone for winding and unwinding a lift cord and rotates integrally with the winding cone; a rotating drum that is engaged with the cone cap so that an axial movement of the rotating drum is restricted, and that can rotate relative to the cone cap within a predetermined angular range and rotates integrally with the cone cap when the angular range is exceeded; and a cam clutch that rotates integrally with the cone cap and that is engaged with the rotating drum so that the cam clutch axially moves relative to the cone cap upon rotation of the rotating drum.

2. The cam unit of Claim 1, wherein the cone cap comprises a tubular brake part housing the rotating drum and the cam clutch, the tubular brake part comprises a pair of engaging protrusions, the rotating drum comprises a restricting protrusion disposed between the pair of engaging protrusions, the cam clutch has a pair of moving slits that are engaged with the pair of engaging protrusions, and when the rotating drum rotates relative to the cone cap, the restricting protrusion contacts the engaging protrusions and thus a range in which the rotating drum can rotate relative to the cone cap is restricted.

3. A horizontal blind comprising: a plurality of first and second ladder cords suspended from a head box and having a plurality of wefts between a pair of warps; a bottom rail disposed at lower ends of the ladder cords; a plurality of slats supported by the wefts of the ladder cords; first and second lift cords suspended from the head box and supporting the bottom rail; and lift means configured to raise or lower the bottom rail by changing lengths of the lift cords between the head box and the bottom rail from the head box, wherein the first and second lift cords are suspended on opposite sides in a front-back direction, of the slats, the first ladder cord comprises a first connecting part into which the first lift cord is inserted so as to be vertically slidable and that is engaged with a notch formed in the slat, the second ladder cord comprises a second connecting part into which the second lift cord is inserted so as to be vertically slidable, and the horizontal blind has at least one of features (1) and (2): (1) a range in which the second lift cord can move in the second connecting part in a front-back direction is larger than a range in which the first lift cord can move in the first connecting part in a front-back direction; and (2) the wefts of the first ladder cord are shorter than the wefts of the second ladder cord.

4. The horizontal blind of Claim 3, wherein the second ladder cord is not engaged with the notch of the slats.

5. The horizontal blind of Claim 3 or 4, wherein the notch has a tapered surface expanding in an outward front-back direction of the slats.

6. The horizontal blind of any one of Claims 3 to 5, wherein the first ladder cord comprises a plurality of first connecting parts, one or more first connecting parts close to the head box have at least one of features (A1) and (B 1): (Al) the first lift cord is not inserted in nor connected to the one or more first connecting parts; and (B 1) the first lift cord is not inserted in the one or more first connecting parts but is connected to the one or more first connecting parts through a first connecting member.

7. The horizontal blind of any one of Claims 3 to 6, wherein the second ladder cord comprises a plurality of second connecting parts, one or more second connecting parts close to the head box have at least one of features (A2) and (B2): (A2) the second lift cord is not inserted in nor connected to the one or more second 25 connecting parts; and (B2) the second lift cord is not inserted in the one or more second connecting parts but is connected to the one or more second connecting parts through a second connecting member.

8. The horizontal blind of any one of Claims 3 to 7, wherein the first and second ladder cords comprise a plurality of first connecting parts and a plurality of second connecting parts, respectively, and have at least one of features (a) and (b): (a) the first lift cord is not inserted in nor connected to a first connecting part closest to the head box, and the first lift cord is not inserted in a first connecting part second closest to the head box but is connected to the second closest first connecting part through a first connecting member; and (b) the second lift cord is not inserted in nor connected to a second connecting part closest to the head box, and the second lift cord is not inserted in a second connecting part second closest to the head box but is connected to the second closest second connecting part through a second connecting member.

9. A drive unit for use in a sunlight shielding apparatus, comprising: a head box; a drive shaft housed in the head box and configured to, when rotated, raise or lower a sunlight shielding member; an operation unit configured to rotate the drive shaft on the basis of rotation of an operation pulley; and an operation cord hung on the operation pulley, wherein the head box has an operation cord insertion hole in which the operation cord is inserted, and the operation unit comprises a cord retreat part that reduces interference between the operation cord and the head box with the operation cord inserted in the operation cord insertion hole and that enables the operation unit to slide relative to the head box in a width direction.

10. The drive unit of Claim 9, wherein the operation unit comprises a case which rotatably supports the operation pulley and holds a gear for transmitting rotation of the operation pulley to the drive shaft, the case has an opposite surface opposite to a surface of the head box having the operation cord insertion hole formed therein, and the cord retreat part is a gap between the opposite surface of the case and the head box.

11. The drive unit of Claim 10, wherein the head box has the operation cord insertion holes in positions close to right and left edges of the head box, and the case has the cord retreat parts on right and left sides of the operation pulley.

12. The drive unit of Claim 10 or 11, wherein the case comprises a case cap, a gear case, and an end cap which are disposed in a width direction in this order, the operation pulley is rotatably supported between the case cap and the gear case, a transmission gear for transmitting the rotation of the operation pulley to the drive shaft is supported between the gear case and the end cap, and the cord retreat part is a gap between the opposite surfaces of the case cap, the gear case, and the end cap, and the head box.

13. The drive unit of any one of Claims 9 to 12, further comprising a cord gate which can be attached to the operation cord insertion hole, wherein when attached to the operation cord insertion hole, the cord gate is engaged with the operation unit so that the operation unit cannot slide.

14. The drive unit of any one of Claims 9 to 13, wherein the head box has front and rear protruding walls protruding from front and rear walls, respectively, toward a center in a front-back direction, and the operation unit can slide in a space surrounded by a bottom wall, the front and rear walls, and the front and rear protruding walls of the head box. 26