JP6151571B2 - Cam unit - Google Patents

Description

  The present invention relates to a cam unit for an obstacle detection / stop device used in a solar shading device such as a horizontal blind, a raising curtain, and a pleated screen.

  In the solar shading device, one end of the lifting / lowering cord is attached to the bottom rail provided under the solar shading material suspended from the head box, and the other end of the lifting / lowering cord is attached to the winding cone. Is rotated to wind up and rewind the lifting cord and lift the solar shading material. In such a solar shading device, the bottom rail is lowered by rotating the winding cone in the rewinding direction using the tension applied to the lifting / lowering cord by the weight of the bottom rail. Also, when the bottom rail collides with an obstacle when the bottom rail is lowered, an obstacle detection stop device is used to stop the winding cone from rotating and prevent the hoisting cord from being excessively rewound. (For example, refer to Patent Document 1).

Japanese Patent No. 3965151

  In Patent Document 1, a rotating drum and a cam clutch are accommodated in a winding cone, and when the rotating drum is rotated in a state where the rotation of the winding cone is stopped, the cam clutch moves in the axial direction in a direction away from the winding cone. The winding claw provided on the cam clutch engages with the braking protrusion of the support member, so that the winding cone is stopped when an obstacle is detected.

  By the way, the length and diameter of the winding cone may be different for each product. In order to incorporate the obstacle detection and stop device using the technology in Patent Document 1 into all products, it is necessary to consider the configuration related to the obstacle detection and stop device when designing the winding cone of all products, It becomes complicated.

  This invention is made | formed in view of such a situation, and provides the structure which can respond to the difference in the length and diameter of a winding cone.

  According to the present invention, a cone cap that is detachably fitted to a winding cone that winds and unwinds the lifting / lowering cord and rotates integrally with the winding cone, and an axial movement with respect to the cone cap And a rotating drum that rotates relative to the cone cap within a predetermined angular range and rotates integrally with the cone cap, and the cone cap; A cam unit is provided that includes a cam clutch that is integrally rotated and is engaged with the rotary drum so as to move relative to the cone cap in the axial direction as the rotary drum rotates.

  The present inventors have intensively studied to avoid the complexity of designing the winding cone, and have come up with the idea of incorporating an obstacle detection and stop device into the cone cap attached to the proximal end of the winding cone. Based on this idea, if a cam unit in which a cone cap, a rotating drum, and a cam clutch are integrally engaged is prepared, this cam unit can be mounted even if the length and diameter of the winding cone change. As a result, the present inventors have realized that an obstacle detection / stopping device can be easily realized.

  Preferably, the cone cap includes a braking cylinder portion that accommodates the rotating drum and the cam clutch, the cone cap includes a pair of engagement protrusions in the braking cylinder portion, and the rotating drum includes the pair of engagement protrusions. The cam clutch includes a pair of moving slits that engage with the pair of engagement protrusions, and the relative rotation of the rotary drum with respect to the cone cap. Sometimes, the restricting protrusion comes into contact with the engaging protrusion to define the relative rotatable range.

The horizontal blind of 1st Embodiment of this invention is shown, (a)-(b) is a front view, (c) is a right view. (B) shows a state where the front wall of the head box 1 is removed, and (c) shows a state where the box cap 21 is removed. (A) is a perspective view which shows the support member 11 in FIG. 1, and the member accommodated in this. (B) is a perspective view showing the details of the tilt spring 24 in (a). It is a perspective view which shows the support member 11 of FIG. It is the perspective view which looked at the support member 11 of FIG. 2 from another angle. (A) is a perspective view which shows the fitting method of the adapter 51 of the support member 11 of FIG. (B) is a bottom view showing a state in which the pulley 53 is mounted in the shaft holes 51e and 51f provided in the adapter 51, and (c) passes through the centers of the shaft holes 51e and 51f, and corresponds to (b). FIG. It is a perspective view which shows the state from which the cone cap 14 and the winding cone 9 of FIG. 2 were isolate | separated. (A) is a perspective view which shows the state from which the cam clutch 12 and the rotating drum 13 which were included in the obstruction detection stop apparatus 10 of FIG. 2 were isolate | separated. (B) is the figure which looked at the rotating drum 13 from the cam clutch 12 side. (C) is a perspective view showing a state in which the cam clutch 12 and the rotary drum 13 are connected. (A) is the perspective view which looked at the cam clutch 12 and the rotating drum 13 of FIG. 7 from another angle. (B) is a perspective view showing the cam clutch 12 and the rotating drum 13 in the connected state and the cone cap 14 in the separated state. (A)-(b) is a perspective view which shows the cam clutch 12, the rotating drum 13, and the cone cap 14 of a connection state. (A) is the figure which looked at the rotating drum 13 and the cone cap 14 from the cam clutch 12 side. (B) is a figure corresponding to FIG.7 (c). (C) is a figure corresponding to FIG. (A)-(c) has shown the state in which all the control protrusions 13e are adjacent to the engagement protrusion 14c. (A) is the figure which looked at the rotating drum 13 and the cone cap 14 from the cam clutch 12 side. (B) is a figure corresponding to FIG.7 (c). (C) is a figure corresponding to FIG. (A)-(c) has shown the state by which the control protrusion 13e is adjacent to the engagement protrusion 14d, respectively. (A)-(c) is a right view corresponding to FIG.1 (c) which shows the state which tilted the slat 3 from the fully closed state to the reverse fully closed state in the state in which the bottom rail 4 exists in a lower limit position. . In 2nd Embodiment of this invention, it is a perspective view which shows that the rotating drum 13 is comprised by the 1st rotating drum 63 and the 2nd rotating drum 73, (a) is a connection state, (b) is a isolation | separation state. Indicates. It is the perspective view which looked at the 1st and 2nd rotating drums 63 and 73 of Drawing 13 from another angle. (A) is a perspective view showing a connection structure of the second rotating drum 73, the cone cap 14, and the first rotating drum 63. (B)-(c) is a perspective view of the cone cap 14. FIG. It is a perspective view which shows the connection structure of the cam clutch 12 and the 2nd rotation drum 73, (a) shows a separation state, (b) shows a connection state. (A) is a perspective view from another angle which shows the connection structure of the cam clutch 12 and the 2nd rotation drum 73, (b) is the connection of the cam clutch 12, the 2nd rotation drum 73, and the cone cap 14. FIG. It is a perspective view which shows a structure. 4 is a perspective view showing the cam clutch 12, the second rotating drum 73, the cone cap 14, and the first rotating drum 63 in a connected state. FIG. (A)-(b), (c)-(d) shows the 1st state and 2nd state of the positional relationship of the 1st and 2nd rotating drums 63 and 73 and the cone cap 14, respectively. (A) And (c) is sectional drawing seen from the cam clutch 12 side which passes along the control protrusion 13e of the 2nd rotation drum 73, and the engagement protrusions 14c and 14d of the cone cap 14, (b). And (d) is a cross-sectional view seen from the cam clutch 12 side, passing through the restricting protrusion 63e of the first rotating drum 63 and the restricting protrusion 73d of the second rotating drum 73. (A)-(b), (c)-(d) shows the 3rd state and 4th state of the positional relationship of the 1st and 2nd rotating drums 63 and 73 and the cone cap 14, respectively. (A) And (c) is sectional drawing seen from the cam clutch 12 side which passes along the control protrusion 13e of the 2nd rotation drum 73, and the engagement protrusions 14c and 14d of the cone cap 14, (b). And (d) is a cross-sectional view seen from the cam clutch 12 side, passing through the restricting protrusion 63e of the first rotating drum 63 and the restricting protrusion 73d of the second rotating drum 73.

  Hereinafter, embodiments of the present invention will be described. Various characteristic items shown in the following embodiments can be combined with each other. The invention is established independently for each feature.

1. First Embodiment A horizontal blind as a solar shading device shown in FIG. 1 is supported by suspending a plurality of slats 3 as solar shading materials via a plurality of ladder cords 2 suspended from a head box 1. The bottom rail 4 is suspended and supported at the lower end of the ladder cord 2.

  In the vicinity of the ladder cord 2, a plurality of lifting cords 5 are suspended from the head box 1, the central lifting cord 5 is suspended on the front side (inside the room) of the slats 9, and the lifting cords 5 at both ends are connected to the slats 9. Hangs on the back side (outside the room). The lifting cord 5 has an upper end wound around a winding cone 9 disposed in the head box 1 and a lower end connected to the bottom rail 4.

  The lifting / lowering cord 5 is attached to the winding cone 9 by hooking a knot provided at one end thereof to the engaging groove 9d of the winding cone 9, and winding or unwinding is performed based on the rotation of the winding cone 9. The bottom rail 4 and the slat 3 are moved up and down based on this rotation. As shown in FIG. 2A, the winding cone 9 is rotatably supported by the support member 11 and can be rotated relative to the drive shaft 8. The support member 11 is detachably fixed to the head box 1. Each support member 11 includes an obstacle detection / stop device 10 that detects that the bottom rail 4 has collided with an obstacle when the bottom rail 4 is lowered and stops the rotation of the drive shaft 8.

  The upper end of the ladder cord 2 is attached to a tilt spring 24 attached to the tilt drum 23. The tilt spring 24 is formed by bending one wire into a loop shape as shown in FIG. 2B, and has ladder cord attachment portions 24a1, 24a2 and locking projections 24b1, at both ends. 24b2. Two upper ends of the ladder cord 2 are attached to the two ladder cord attaching portions 24a1 and 24a2, respectively. The tilt drum 23 is supported by the drive shaft 8 so as not to be relatively rotatable in the tilt drum housing portion 11 d of the support member 11. As shown in FIG. 2A, the tilt spring 24 tightens the tilt drum 23 and rotates integrally with the tilt drum 23 when the locking protrusions 24 b 1 and 24 b 2 are not in contact with the support member 11. Therefore, the angle of each slat 3 is adjusted in phase with the ladder code 2 based on the rotation of the tilt drum 23. Further, the tilt drum 23 is further moved in the direction of the arrow XD in a state where the tilt drum 23 is rotated in the direction of the arrow XD in FIG. 2A and the locking projection 24b1 is brought into contact with the locking surface 11h of the support member 11. When rotated, the force in the direction of the arrow XU in FIG. 2B is applied to the locking projection 24b1, so that the diameter of the tilt spring 24 is expanded and the force with which the tilt spring 24 tightens the tilt drum 23 is weakened. It comes to idle with respect to the tilt spring 24. Further, when the tilt drum 23 is rotated in the arrow XU direction and the locking projection 24b1 is brought into contact with the locking surface 11h of the support member 11, the tilt drum 23 is further rotated in the arrow XU direction based on the same principle. As a result, the tilt drum 23 rotates idly with respect to the tilt spring 24. According to such a principle, when each slat 3 is rotated to a substantially vertical direction, it is prevented from further rotating.

  An operation unit 6 is provided at a position on the center side in the width direction from the right end of the head box 1, and the drive shaft 8 accommodated in the head box 1 can be rotationally driven based on the operation of the loop-shaped operation cord 7. The winding cone 9 is rotated based on the rotation of the drive shaft 8. The operation unit 6 includes a known weight drop prevention device (not shown) inside. The self-weight drop prevention device operates when the lifting operation of the bottom rail 4 and the slat 3 based on the operation cord 7 is stopped, stops the rotation of the drive shaft 8, and suspends the bottom rail 4 and the slat 3 at a desired position. Let Moreover, the bottom rail 4 and the slats 3 are lowered based on their own weight by releasing the operation of the own weight lowering prevention device by operating the operation cord 7.

  An operation code insertion hole 13 is provided at a position near the right end and a position near the left end of the head box 1, and the operation code 7 is placed outside the head box 1 through the code gate 15 in the right operation code insertion hole 13. Has been derived. Further, the left operation cord insertion hole 13 is used when the operation unit 6 is moved to the left side of the head box 1, and when not used, as shown in FIG. It is blocked. Both ends of the head box 1 are closed with box caps 21.

Here, the winding cone 9, the support member 11, and the obstacle detection stop device 10 will be described in detail.
As shown in FIG. 6, the winding cone 9 includes a winding portion 9b, a flange 9a provided on the distal end side of the winding portion 9b, and a connecting portion 9c provided on the proximal end side of the winding portion 9b. Is provided. An engaging groove 9d is provided in the connecting portion 9c. Since the winding portion 9b has a tapered shape that gradually decreases from the distal end side toward the proximal end side, the lifting cord 5 wound up at the distal end side is easily moved to the proximal end side. The connecting portion 9c is not tapered. A cone cap 14 is connected to the connecting portion 9c. The cone cap 14 includes a locking cylinder portion 14e extending from the flange 14g to the winding cone 9 side, and a braking cylinder portion 14f extending to the opposite side. The locking cylinder portion 14e has an outer diameter smaller than that of the braking cylinder portion 14f, and the groove engagement protrusion 14a and the connecting protrusion 14b protrude outward in the radial direction from the locking cylinder portion 14e. Each of the engagement groove 9d, the groove engagement protrusion 14a, and the connection protrusion 14b is provided at two positions at intervals of 180 degrees. Further, the groove engaging protrusion 14a and the connecting protrusion 14b are provided at positions shifted from each other by 90 degrees.

  The diameter of the outer peripheral circle surrounding the two connecting protrusions 14b is slightly smaller than the inner diameter of the connecting part 9c, and the position of the groove engaging protrusion 14a is adjusted to the engaging groove 9d so that the connecting protrusion 14b is By inserting it into the connecting portion 9c, the cone cap 14 and the winding cone 9 can be loosely connected. In this state, since the groove engaging protrusion 14a is engaged with the engaging groove 9d, the cone cap 14 and the take-up cone 9 rotate together, but there is nothing that prevents the axial separation of the two. In this state, both are easily separated. In addition, the taper surface 14h is provided in the edge of the axial direction of the connection protrusion 14b, and it becomes easy to insert the connection protrusion 14b in the connection part 9c.

  As shown in FIG. 3, the support member 11 includes a winding cone support portion 11 a that supports the flange 9 a of the winding cone 9, and a cone cap support portion 11 b that supports the brake cylinder portion 14 f of the cone cap 14. As shown in FIG. 2, in a state where the winding cone 9 and the cone cap 14 are connected, the flange 9a of the winding cone 9 is supported by the winding cone support portion 11a, and the braking cylinder portion 14f of the cone cap 14 is fixed to the cone cap. When supported by the support portion 11b, on the winding cone 9 side, the flange 9a engages with the winding cone support portion 11a to prevent axial movement, and on the cone cap 14 side, the flange 14g abuts against the partition wall 11c. Thus, the cone cap 14 is prevented from moving in the axial direction in a direction away from the winding cone 9. As described above, when the winding cone 9 and the cone cap 14 are connected to the support member 11 in a connected state, the winding cone 9 and the cone cap 14 are not separated. As will be described later, a cam clutch 12 and a rotating drum 13 are accommodated in a brake cylinder portion 14f of the cone cap 14, and the support member 11 engages with a brake claw 12c of the cam clutch 12 to drive the drive shaft 8. A braking protrusion 11g is provided to stop the rotation.

  As shown in FIG. 4, an adapter 51 having a lifting / lowering cord insertion hole 51a and a ladder cord insertion hole 51b is detachably fitted to the bottom surface of the support member 11, and the lifting / lowering cord 5 and the ladder cord 2 are respectively Then, it is introduced into the support member 11 through the lifting / lowering cord insertion hole 51 a and the ladder code insertion hole 51 b and attached to the winding cone 9 and the tilt drum 23. As shown in FIG. 5A, the adapter 51 is supported by a protrusion 11e that protrudes from the front wall and the rear wall of the support member 11 toward the center in the front-rear direction. Advantages of using such an adapter 51 include that the support member 11 can be easily molded and that the support member 11 can be easily shared.

  The lifting / lowering cord insertion hole 51a is provided between the partition wall 51c and the partition wall 51d, and the partition walls 51c and 51d are provided with six sets of shaft holes 51e and 51f. The pulley 53 can be fixed to the adapter 51 by inserting the fixing pin 52 so that the position of the shaft hole 53a of the pulley 53 is aligned with the shaft holes 51e and 51f of the partition walls 51c and 51d. The fixing pin 52 is not easily removed from the shaft hole 51f by being press-fitted into the shaft hole 51f, but may be prevented from being removed by another method. As described above, in this embodiment, since a plurality of sets of the shaft holes 51e and 51f are provided, the pulley is changed when the fixing position of the pulley 53 is changed in accordance with the width of the slat 3 or when the support member 11 is changed left and right. 53 is easily changed. Further, the pulley 53 and the fixing pin 52 can be fixed to the adapter 51 before the adapter 51 is attached to the support member 11. As a result, the mounting operation of the pulley 53 and the fixing pin 52 is facilitated.

  Next, the obstacle detection stop device 10 will be described in detail. The obstacle detection / stop device 10 includes a support member 11, a cam clutch 12, a rotating drum 13, and a cone cap 14.

  As shown in FIGS. 7 to 9, the cam clutch 12 is formed in a substantially cylindrical shape, and includes a cylindrical portion 12a and a braking portion 12b formed to have a larger diameter than the cylindrical portion 12a. The cylindrical portion 12a is inserted into and supported by the cam clutch support hole 11f of the support member 11.

  The diameter of the outer peripheral surface of the braking portion 12b is set to be slidable with the inner peripheral surface of the braking cylinder portion 14f of the cone cap 14. A braking claw 12c is formed at the end of the braking portion 12b on the cylinder portion 12a side. The braking claw 12c protrudes in a sawtooth shape in the axial direction, and can engage with the braking projection 11g of the support member 11.

  The brake pawl 12c is prevented from rotating in the circumferential direction by engaging with the brake protrusion 11g, and the support member 11 and the cam clutch 12 are not allowed to rotate relative to each other. A plurality of braking claws 12c are formed at equal angular intervals along the circumferential direction of the braking portion 12b (two in this embodiment at intervals of 180 degrees).

  As shown in FIGS. 7A and 8A, a sliding hole 12d and a moving slit 12e as a cam structure are formed on the side wall of the braking portion 12b. The sliding hole 12d is formed to be inclined by about 68 degrees with respect to the axis of the braking portion 12b. Further, the length of the sliding hole 12d is set so as to be disposed over an angle range of approximately 120 degrees in the circumferential direction of the braking portion 12b.

  The moving slit 12e is formed along the axial direction of the braking portion 12b. As shown in FIG. 8B, the moving slit 12e is disposed so as to correspond to the positions of the engaging protrusions 14c and 14d of the cone cap 14, and the moving slit 12e and the engaging protrusions 14c and 14d are arranged. , The cam clutch 12 and the cone cap 14 are assembled so as not to be relatively rotatable and to be relatively movable along the axial direction.

  The cam clutch 12 is relatively moved in the axial direction of the cone cap 14, so that when the braking claw 12c is engaged with the braking projection 11g of the support member 11, the cam clutch 12 cannot rotate relative to the support member 11. When the engagement state between 12c and the brake protrusion 11g is released, the support member 11 can rotate relative to the support member 11.

  The side wall of the braking portion 12b is formed so that one side (the back side in FIG. 8A) sandwiching both moving slits 12e in the circumferential direction protrudes in the axial direction from the other side (the front side in FIG. 8A). .

  Further, the drive shaft 8 is inserted into the cylindrical hole 12f of the cylindrical portion 12a of the cam clutch 12. However, since the cylindrical hole 12f is larger than the circumscribed circle diameter of the drive shaft 8 having a rectangular cross section, the cam clutch 12 is driven. Relative rotation with the shaft 8 is possible.

  As shown in FIGS. 7 to 9, a rotating drum 13 is accommodated inside the cam clutch 12 in the radial direction. The rotary drum 13 includes a main body portion 13a and a locking claw 13b. The main body portion 13a is formed in a substantially cylindrical shape, and as shown in FIG. 7B, a regular tetragonal insertion hole 13c is formed at the center of the main body portion 13a. The rotary drum 13 has a rectangular drive shaft 8 of the same size passing through the insertion hole 13 c and rotates together with the drive shaft 8.

  Four locking claws 13b are formed at equal angular intervals (90 degree intervals) along the circumferential direction of the main body portion 13a, and when inserted into the locking cylinder portion 14e of the cone cap 14, It can be elastically deformed toward the center. The locking claw 13b is formed to have a smaller diameter than the main body 13a. The locking cylinder 14e of the cone cap 14 is sandwiched between the main body 13a and each claw 13b in the axial direction. Does not move relative to the axial direction.

  Two notches are formed in the main body portion 13a along the axial direction, and an arm 13f is formed by the notches. A sliding protrusion 13d is formed at the tip of the arm 13f so as to protrude outward in the radial direction of the rotary drum 13. The arm 13f has flexibility along the radial direction of the rotating drum 13 due to the notch, and when assembled inside the cam clutch 12, the tip thereof bends toward the center together with the sliding protrusion 13d. Yes. The sliding protrusion 13d is formed to protrude in a substantially cylindrical shape, and is formed to be slidable in the sliding hole 12d of the cam clutch 12.

  As shown in FIG. 8A, a restricting protrusion 13e is formed at one end of the main body 13a on the side of the locking claw 13b and protrudes radially outward. The restricting protrusion 13e is disposed at a position substantially opposite to the sliding protrusion 13d in the circumferential direction of the main body 13a. The restricting protrusion 13e is formed so as to protrude within a predetermined angular range in the circumferential direction of the main body 13a. When the rotating drum 13 rotates relative to the cone cap 14, the restricting protrusion 13e and the engaging protrusions 14c and 14d The amount of protrusion is set so as to abut at.

  The rotating drum 13 formed in this way is assembled so that the sliding protrusion 13d is accommodated in the sliding hole 12d of the cam clutch 12, as shown in FIG. Further, as shown in FIG. 8B, FIG. 10A and FIG. 11A, the rotary drum 13 is arranged between the restricting protrusion 13e and the engaging protrusions 14c and 14d of the cone cap 14. It is assembled to be installed. Accordingly, as shown in FIGS. 10A and 11A, the rotary drum 13 and the cone cap 14 are relatively moved by the regulating projection 13e between the engagement projections 14c and 14d of the cone cap 14. Relative movement is possible only within the range.

Next, the operation of the horizontal blind constructed as described above will be described.
First, the operation for lifting the horizontal blind will be described.
When the operation cord 7 is operated and the drive shaft 8 is rotated in the pulling direction of the horizontal blind (in the direction of the arrow XU in FIG. 2A), the rotation is transmitted to the rotary drum 13, and the rotary drum 13 is Rotate in the direction of arrow XU in 10 (a) and (b). Then, the restricting protrusion 13e of the rotary drum 13 moves in the direction of the arrow XU in FIG. 10A, and the sliding protrusion 13d moves in the direction of the arrow YU in FIG. 10B along the sliding hole 12d. To do. At this stage, the rotation of the rotating drum 13 is not transmitted to the cone cap 14, and the rotating drum 13 rotates relative to the cone cap 14. Further, as the sliding protrusion 13d moves, a force in the direction of the arrow ZU in FIG. 10B is applied to the cam clutch 12, so that the cam clutch 12 is applied to the cone cap 14 by the arrow in FIG. Move relative to the ZU direction. In this state, the braking claw 12c has a small protruding amount from the braking cylinder portion 14f, the braking claw 12c is not engaged with the braking projection 11g of the support member 11, and the cam clutch 12 is in contact with the support member 11. Relative rotation is possible.

  When the drive shaft 8 is further rotated in the same direction, the restricting protrusion 13e contacts the engaging protrusion 14c and applies a force in the direction of the arrow XU in FIG. 10A to the engaging protrusion 14c. The drum 13 rotates integrally with the cone cap 14. Further, since the cam clutch 12 and the winding cone 9 always rotate integrally with the cone cap 14, as a result, the rotating drum 13 rotates integrally with the cone cap 14, the cam clutch 12 and the winding cone 9, and the lifting cord 5 is wound around the winding cone 9 and the bottom rail 4 is raised.

Next, the operation at the time of lowering the horizontal blind will be described.
Since the operation at the time of lowering the horizontal blind is performed using the weight of the slat 3 and the bottom rail 4, the driving force at the time of lowering is transmitted from the winding cone 9 toward the drive shaft 8.

  When tension is applied to the lifting / lowering cord 5 by the dead weight of the slat 3 and the bottom rail 4, a force in the direction of the arrow XD in FIG. The rotation by this force is transmitted to the cone cap 14 and the cam clutch 12 as they are, and the cone cap 14 and the cam clutch 12 are rotated in the direction of the arrow XD in FIGS. At this time, the restricting protrusion 13e is in contact with the engaging protrusion 14c as shown in FIG. 10A, and therefore the restricting protrusion 13e is moved from the engaging protrusion 14c to FIG. 10A. , The rotary drum 13 and the drive shaft 8 rotate integrally with the cone cap 14.

  When the bottom rail 4 collides with an obstacle, or when the bottom rail 4 reaches the lower limit position and the load of the bottom rail 4 is applied to the ladder cord 2, the tension applied to the lifting / lowering cord 5 is weakened. As a result, the winding cone 9 The force in the direction of the arrow XD in FIG. 2A applied to is reduced, and the rotation of the winding cone 9 is decelerated or stopped. When the rotation of the winding cone 9 is not decelerated or stopped in another obstacle detection / stop apparatus 10 provided in the head box 1, the obstacle detection / stop apparatus in which the rotation of the winding cone 9 is decelerated or stopped. 10, the rotation of the rotary drum 13 and the drive shaft 8 in the direction of the arrow XD in FIG. 10A is faster than the rotation of the cone cap 14, and as a result, the restricting protrusion 13 e moves from the engagement protrusion 14 c to the arrow. Move relative to the XD direction. At this time, the rotating drum 13 rotates relative to the cam clutch 12 in the direction indicated by the arrow XD in FIG. 10B, and as a result, the sliding protrusion 13d moves along the sliding hole 12d in the direction indicated by the arrow in FIG. Move in the YD direction. Then, as the sliding protrusion 13d moves, a force in the direction of the arrow ZD in FIG. 10B is applied to the cam clutch 12, so that the cam clutch 12 is applied to the cone cap 14 by the arrow in FIG. Relative movement in the ZD direction results in the states shown in FIGS. In this state, the braking claw 12c has a large protruding amount from the braking cylinder portion 14f, the braking claw 12c is engaged with the braking projection 11g of the support member 11, and the cam clutch 12 rotates relative to the support member 11. It becomes impossible. At the same time, the cone cap 14 cannot be rotated relative to the support member 11, and the rotating drum 13 is moved when the restricting protrusion 13e comes into contact with the engaging protrusion 14d as shown in FIG. The above relative rotation becomes impossible, and as a result, the rotation of the drive shaft 8 is stopped.

  As shown in FIG. 12 (a), when the bottom rail 4 reaches the lower limit position LL and the obstacle detection and stop device 10 operates, the slat 3 is fully closed, and the bottom rail 4 is similarly inclined. It is in the state. Further, the locking projection 24 b 1 of the tilt spring 24 is in contact with the locking surface 11 h of the support member 11.

  In this state, when the drive shaft 8 is rotated in the pulling direction (direction of arrow XU in FIGS. 2A and 12), the tilt drum 23 is rotated in the direction of arrow XU, and the slat 3 is moved to FIG. When the drive shaft 8 is further rotated, the slat 3 enters the reverse fully closed state shown in FIG. In the state shown in FIG. 12C, the locking projection 24 b 2 of the tilt spring 24 is in contact with the locking surface 11 h of the support member 11. At this time, the restricting protrusion 13e of the rotary drum 13 moves in the direction of the arrow XU in FIG. 11A and the sliding protrusion 13d moves in the direction of the arrow YU in FIG. 11C, the engagement between the braking claw 12c and the braking projection 11g is released, and the drive shaft 8 can be rotated 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. For this reason, winding of the raising / lowering cord 5 is started after the drive shaft 8 is rotated by the angle R in FIG. On the other hand, since the tilt drum 23 rotates integrally with the drive shaft 8, the winding of the lifting / lowering cord 5 is started with an angle R delayed from the tilt of the slat 3. In the present embodiment, the angle R is set to a relatively large angle of, for example, 80 degrees or more (preferably 90, 100, 110, or 120 degrees or more). Therefore, the slat 3 is moved from the fully closed state shown in FIG. Even if the drive shaft 8 is rotated until the reverse fully closed state shown in FIG. 12C, the winding of the lifting / lowering cord 5 is not started, and the fully closed state shown in FIG. 12A and FIG. The height position of the bottom rail 4 can be made the same in the reverse fully closed state shown. In Patent Document 1, since the angle R is small, winding of the lifting / lowering cord is started while the slat is being tilted from the fully closed state to the reverse fully closed state. Therefore, the height position of the bottom rail in the reverse fully closed state becomes higher than the height position of the bottom rail in the fully closed state, and light leakage occurs from below the bottom rail.

  What should be noted in the present embodiment is that the obstacle detection and stop device 10 includes a support member 11, a cam clutch 12, a rotating drum 13, and a cone cap 14. The winding cone 9 is configured to rotate integrally with the cone cap 14, and is not incorporated in the obstacle detection stop mechanism. In addition, the support member 11 simply provides a braking protrusion 11g for engaging with the braking claw 12c and stopping the rotation of the cam clutch 12 as a configuration of the obstacle detection / stop device 10. . Therefore, if a cam unit composed of the cam clutch 12, the rotating drum 13, and the cone cap 14 is prepared, this cam unit can be used for various types of support members 11 and winding cones 9. Very easy. The winding cones 9 have different lengths and diameters. However, if each of the winding cones 9 is configured to function as the obstacle detection / stop device 10, the design becomes complicated. In the present embodiment, the winding cone 9 is not provided with any special structure other than simply providing the engaging groove 9d for integrally rotating with the cone cap 14, so that the design can be simplified. It is possible.

In addition, you may implement the said embodiment in the following aspects.
In the above embodiment, the groove engaging protrusion 14a of the cone cap 14 and the engagement groove 9d of the winding cone 9 are engaged and rotated together, but the configuration for rotating both integrally is particularly limited. Instead, another configuration may be employed.
In the above embodiment, the cone cap 14 and the winding cone 9 are not engaged so as to prevent separation in the axial direction, and are easily separated when not attached to the support member 11. It may be detachably engaged so as to prevent separation of directions.

In the above embodiment, the solar shading device is a horizontal blind, and the obstacle detection stop device 10 is disposed on the horizontal blind. However, the solar shading device may be provided with a bottom rail and a lifting / lowering cord. Therefore, the solar radiation shielding device may be a pleated curtain. Further, by using a weight in place of the bottom rail, the solar radiation shielding device may be raised and used as a curtain.

2. Second Embodiment Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. In the following description, description of parts common to the first embodiment will be omitted as appropriate.

  In the first embodiment, the rotary drum 13 is composed of one component that rotates integrally with the drive shaft 8. However, in this embodiment, the rotary drum 13 rotates integrally with the drive shaft 8 as shown in FIG. 13. The first rotating drum 63 and the second rotating drum 73 engaged with the cam clutch 12 are configured. The second rotating drum 73 has a main body 13a, a sliding 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 has a small cylindrical portion 73a extending from the main body portion 13a toward the first rotating drum 63 and having a smaller diameter than the main body portion 13a, and the small cylindrical portion 73a extends in the circumferential direction. A slide groove 73b is provided. The first rotating drum 63 includes a cylindrical main body 63a, an arm 63b sandwiched between two cutouts along the axial direction, and a slide that is provided at the tip of the arm 63b and protrudes radially inward. And a protrusion 63c. As shown in FIG. 14, a regular square insertion hole 63 c is formed in the main body 63 a of the first rotating drum 63. In the first rotating drum 63, the driving shaft 8 having the same cross-sectional square shape passes through the insertion hole 63 c and rotates together with the driving shaft 8.

  When the first rotating drum 63 and the second rotating drum 73 are connected, the small cylinder portion 73a is inserted into the main body portion 63a, and the sliding projection 63c is directed radially outward using the elasticity of the arm 63b. The sliding protrusion 63c is engaged with the sliding protrusion 63c while being bent. As a result, the first rotating drum 63 and the second rotating drum 73 cannot move relative to each other in the axial direction.

  As shown in FIG. 14, the second rotating drum 73 is provided with restricting protrusions 73 d that protrude from the small tube portion 73 a toward the first rotating drum 63 at two positions at intervals of 180 degrees. In addition, inside the cylindrical main body 63a of the first rotating drum 63, there are provided restriction protrusions 63e protruding inward in the radial direction at two locations at intervals of 180 degrees. The restricting protrusion 73d and the restricting protrusion 63e are alternately arranged on the same rotation locus. That is, the restriction protrusion 63e is disposed between the two restriction protrusions 73d. For this reason, when the first and second rotating drums 63 and 73 are rotated relative to each other, the restricting protrusion 73d and the restricting protrusion 63e come into contact with each other to prevent further relative rotation. Accordingly, the first and second rotating drums 63 and 73 can be relatively rotated within a predetermined angle range, and cannot be relatively rotated when the range is exceeded.

  As shown in FIG. 15A, the first rotating drum 63 and the second rotating drum 73 are actually connected with the cone cap 14 sandwiched therebetween. The connection structure in this case is the same as that shown in FIG. When the first rotating drum 63 and the second rotating drum 73 are connected with the cone cap 14 sandwiched therebetween, the locking surface 63d of the first rotating drum 63 and the locking surface 73c of the second rotating drum 73 are respectively connected to the cone cap 14. The cone cap 14 cannot move relative to the first and second rotating drums 63 and 73 in the axial direction. As described above, in the first embodiment, the locking claw 13b is engaged with the locking cylinder portion 14e so that the rotary drum 13 cannot be moved relative to the cone cap 14 in the axial direction. In the embodiment, the first rotary drum 63 and the second rotary drum 73 are engaged with each other with the cone cap 14 interposed therebetween, so that the first and second rotary drums 63 and 73 cannot move relative to the cone cap 14. Yes.

  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 brake cylinder 14f, and a flange 14g. Is as described in the first embodiment. Further, the cone cap 14 includes an insertion cylinder portion 14 i that accommodates the first rotating drum 63 and is inserted into the winding cone 9 on the opposite side of the braking cylinder portion 14 f across the flange 14 g.

  As shown in FIG. 16, the cam clutch 12 and the second rotating drum 73 engage the sliding protrusion 13d of the second rotating drum 73 with the sliding hole 12d of the cam clutch 12, as in the first embodiment. It is connected by letting. Further, as shown in FIG. 17, as in the first embodiment, the cam clutch 12 and the cone cap 14 cannot be rotated relative to each other by engaging the moving slit 12e and the engaging protrusions 14c and 14d. It is assembled so as to be relatively movable along the axial direction.

Next, the operation of the horizontal blind constructed as described above will be described.
First, the operation for lifting the horizontal blind will be described.
Next, when the operation cord 7 is operated and the drive shaft 8 is rotated in the horizontal blind pulling direction (the arrow XU direction in FIG. 2A), the rotation is transmitted to the first rotating drum 63, and the first The one-rotation drum 63 rotates in the direction of arrow XU in FIG. 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, and FIGS. It will be in the 1st state shown in b).
In this state, when the drive shaft 8 is further rotated in the direction of the arrow XU in FIG. 2A, the first and second rotating drums 63 and 73 rotate integrally in the direction of the arrow XU in FIG. 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 the engaging protrusion 14c of the cone cap 14, and FIG. c) to the second state shown in (d).
In this state, when the drive shaft 8 is further rotated in the direction of the arrow XU in FIG. 2, the cone cap 14 and the winding cone 9 rotate together with the drive shaft 8, and the winding of the elevating cord 5 is started. At this time, the sliding protrusion 13d of the second rotating drum 73 is located at the point A shown in FIG. 16 (b) in the sliding hole 12d of the cam clutch 12. The protruding amount of the braking claw 12 c is small, and the cam clutch 12 is rotatable relative to the support member 11.

Next, the operation at the time of lowering the horizontal blind will be described.
Since the operation at the time of lowering the horizontal blind is performed using the weight of the slat 3 and the bottom rail 4, the driving force at the time of lowering is transmitted from the winding cone 9 toward the drive shaft 8.

  When tension is applied to the lifting / lowering cord 5 by the dead weight of the slat 3 and the bottom rail 4, a force in the direction of the arrow XD in FIG. The rotation by this force is transmitted to the cone cap 14 and the cam clutch 12 as they are, and the cone cap 14 and the cam clutch 12 are rotated in the direction of the arrow XD in FIG. At this time, since the restricting protrusion 13e is in contact with the engaging protrusion 14c as shown in FIG. 19C, the restricting protrusion 13e extends from the engaging protrusion 14c to the arrow in FIG. 19C. The second rotating drum 73 receives the force in the XD direction and rotates integrally with the cone cap 14. Further, as shown in FIG. 19D, the restricting protrusion 63e of the first rotating drum 63 is in contact with the restricting protrusion 73d of the second rotating drum 73, so that the restricting protrusion 63e is engaged. The first rotating drum 63 and the drive shaft 8 rotate integrally with the second rotating drum 73 by receiving a force in the direction of the arrow XD in FIG. As described above, the rotation of the winding cone 9 is transmitted in the order of the cone cap 14, the second rotating drum 73, the first rotating drum 63, and the drive shaft 8, all of which rotate integrally.

Next, the operation when the bottom rail 4 collides with an obstacle or when the bottom rail 4 reaches the lower limit position and the rotation of the winding cone 9 is decelerated or stopped will be described.
When the rotation of the winding cone 9 is decelerated or stopped and the rotational speed of the drive shaft 8 becomes higher than that of the winding cone 9, the restricting protrusion 63 e of the first rotating drum 63 causes the restricting protrusion of the second rotating drum 73. The relative movement from the portion 73d in the direction of the arrow XD in FIG. 19D results in the third state shown in FIGS. From this state, when the drive shaft 8 is further rotated in the direction of the arrow XD in FIG. 2A, the first and second rotating drums 63 and 73 rotate integrally in the direction of the arrow X in FIG. It will be in the 4th state shown in 20 (c)-(d). At this time, the sliding protrusion 13d of the second rotating drum 73 moves from the point A to the point B shown in FIG. 16B in the sliding hole 12d of the cam clutch 12, and accordingly, the cam clutch 12 Moves away from the cone cap 14, and as a result, the amount of protrusion of the braking claw 12c from the cone cap 14 increases and engages with the braking protrusion 11g of the support member 11, so that the cam clutch 12 is supported. Relative rotation with respect to the member 11 becomes impossible. At the same time, the cone cap 14 is also unable to rotate relative to the support member 11, and the second rotating drum 73 is at a point in time when the restricting protrusion 13e comes into contact with the engaging protrusion 14d as shown in FIG. Thus, no further relative rotation is possible. As a result, the first rotary drum 63 is also unable to rotate relative to the support member 11, and the rotation of the drive shaft 8 is stopped.

In this state, when the drive shaft 8 is rotated in the pulling direction (arrow XU direction in FIG. 2A), the restricting protrusion 63e of the first rotating drum 63 moves in the arrow XU direction in FIG. When the first rotating drum 63 rotates relative to the second rotating drum 73 by an angle S, the restricting protrusion 63e comes into contact with the restricting protrusion 73d, and the first state shown in FIGS. become.
In this state, when the drive shaft 8 is further rotated in the direction of the arrow XU in FIG. 2A, the first and second rotating drums 63 and 73 are integrally rotated in the direction of the arrow XU in FIG. When the rotary drum 73 rotates relative to the cone cap 14 by an angle R, the restricting protrusion 13e comes into contact with the engaging protrusion 14c, and the second state shown in FIGS.
When the drive shaft 8 is further rotated in the arrow XU direction in FIG. 2A in this state, the first and second rotary drums 63 and 73 rotate integrally with the cone cap 14 and the winding cone 9, and Winding is started.

  In the present embodiment, the angle R shown in FIG. 19A is smaller than the angle R shown in FIG. 11A in the first embodiment. The reason for such a design is as follows. In this embodiment, since the relative rotation is possible between the second rotating drum 73 and the first rotating drum 63, the rotation applied to the first rotating drum 63 from the drive shaft 8 is shown in FIG. Delayed by the angle S is transmitted to the second rotating drum 73, and the rotation of the second rotating drum 73 is delayed by the angle R and transmitted to the cone cap 14 and the winding cone 9, and the winding of the lifting cord 5 is started. . For this reason, winding of the raising / lowering cord 5 is started after the drive shaft 8 is rotated by the angle S + the angle R. Therefore, even if the angle R is smaller than that in the first embodiment, the bottom rail 4 can be prevented from rising during the tilting operation. Further, the angle S + the angle R is preferably 80 degrees or more (preferably 90, 100, 110, or 120 degrees or more) in order to effectively suppress the rise of the bottom rail 4 during the tilting operation.

This embodiment can also be implemented in the following aspects.
One or a plurality of drums may be further arranged between the first rotating drum 63 and the second rotating drum 73 so that the adjacent drums are transmitted with a delay by a predetermined angle. As a result, it is possible to further increase the amount of delay in the transmission of rotation from the drive shaft 8.

3. Grasping Invention from Another Viewpoint In another aspect, the present invention starts winding the lifting cord 5 during the tilting operation of the slat 3 with the bottom rail 4 in the lower limit position as shown in FIG. Thus, this solves the problem of preventing the occurrence of light leakage by not changing the lower limit position of the bottom rail 4 between the fully closed state and the reverse fully closed state of the slat 3. The problem is that the obstacle detection stop device 10 is activated and the rotation of the drive shaft 8 is stopped (the state shown in FIG. 11 in the first embodiment, and FIGS. 20C to 20D in the second embodiment). 4), the angle V until the rotation of the winding cone 9 is started when the drive shaft 8 is rotated in the pulling direction is set to 80 degrees or more. In this respect, the obstacle detection / stop device 10 does not necessarily have to be a separate body from the winding cone 9, and the winding cone 9 has the configuration of the obstacle detection / stop device 10 as in Patent Document 1. It may be a part.

  The upper limit of the angle V is not particularly defined, but if the angle V is too large, the accuracy of obstacle detection is lowered, and is, for example, 300 degrees. 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, It is 280, 290, and 300 degrees, and may be within a range between any two of the numerical values exemplified here.

In this aspect, according to the present invention, the head box, the solar shading material supported by being suspended from the head box, the elevating cord for raising and lowering the solar shading material, and the elevating cord disposed in the head box. A winding cone for winding and unwinding, a drive shaft for rotating the winding cone, and a rotation of the drive shaft by detecting a decrease in tension applied to the lifting cord when the solar radiation shielding material is lowered An obstacle detection stop device that stops the rotation of the drive shaft when the drive shaft is rotated in the pulling-up direction of the solar shading material after the drive shaft stops rotating. A solar radiation shielding device is provided in which the idling angle V from the start to the start of rotation of the winding cone is 80 degrees or more.
Preferably, the solar shading device is a horizontal blind, and the solar shading material is a plurality of slats arranged side by side, and includes a tilt mechanism that rotates integrally with the drive shaft and changes the tilt angle of the slats. .
Preferably, the tilt mechanism includes a tilt drum that rotates integrally with the drive shaft, a tilt spring attached to the tilt drum, and a ladder cord that supports the slat and has an upper end attached to the tilt spring. Prepare.

1: Head box 2: Ladder cord 4: Bottom rail 5: Lifting cord 9: Winding cone 11: Support member 11g: Braking protrusion 12: Cam clutch 13: Rotating drum 14: Cone cap 23: Tilt drum

Claims (2)

A cone cap that is detachably fitted to a winding cone that winds and unwinds the lifting cord and rotates integrally with the winding cone;
It is engaged with the cone cap so as to be restricted in axial movement, and is relatively rotatable with respect to the cone cap within a predetermined angle range. A rotating drum that
A cam unit comprising a cam clutch that rotates integrally with the cone cap and that is engaged with the rotary drum so as to move relative to the cone cap in the axial direction as the rotary drum rotates. The cone cap includes a braking cylinder portion that houses the rotating drum and the cam clutch,
The cone cap includes a pair of engaging protrusions in the brake cylinder portion,
The rotating drum includes a regulation projection disposed between the pair of engagement projections,
The cam clutch includes a pair of moving slits that engage with the pair of engaging protrusions,
2. The cam unit according to claim 1, wherein when the rotating drum is relatively rotated with respect to the cone cap, the restricting protrusion comes into contact with the engaging protrusion to define a relative rotatable range thereof.