JP2013072183A - Speed controller and solar shading device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To release a first gear from being fixed to a main shaft when the main shaft rotates in the opposite direction from one direction.SOLUTION: A one-way clutch 33 which fixes the first gear to the main shaft when the main shaft rotates in one direction, and releases the first gear from being fixed to the main shaft when the main shaft rotates in the opposite direction from the one direction is provided between a main shaft 18 and a first gear 31. A second gear and a worm wheel 41b are provided integrally with a first rotary shaft 41, and a worm 42a is provided integrally to a second rotary shaft 42 which crosses the first rotary shaft 41 in three dimensions and is capable of moving axially. Rotating speed suppression means 34 suppresses a rotating speed of the second rotary shaft accompanying rotations of the main shaft and first rotary shaft, and a pair of bearing parts 36, 37 hold both ends of the second rotary shaft. When the main shaft rotates in the opposite direction from the one direction and the second rotary shaft is to rotate through the first rotary shaft while the first gear is not released from being fixed to the main shaft by a one-way clutch, rotational resistance imparting means 38 imparts resistance to the secondary rotary shaft in a direction in which its rotation is stopped.

Description

  The present invention relates to a speed controller that suppresses the rotational speed of a main shaft and a solar radiation shielding device that uses this speed controller to suppress the descending speed or ascending speed of shielding members such as blinds, roman shades, and roll screens.

  Conventionally, the blind member is supported by the lifting shaft through the lifting / lowering cord, the operation cord rotates the lifting / lowering shaft to perform the lifting / lowering operation of the blind member, and the clutch means switches between the rotation / stop of the lifting shaft and further operation. A blind device is disclosed that is configured such that the clutch means is released based on the operation of the means and the blind member can be lowered by its own weight (for example, see Patent Document 1). In this blind device, a braking device that brakes the rotation of the lifting shaft is connected to the lifting shaft. The braking device includes an input shaft for inputting the rotation of the lifting shaft, a speed increasing wheel train for speeding up transmission of the rotation input to the input shaft, and rotating as a part of the speed increasing wheel train and at the rotational speed thereof. Accordingly, a rotating plate member that expands in the outer peripheral direction and a centrifugal governor that includes a sliding contact case that is disposed around the rotating plate member and that can slide in contact with the rotating plate member that expands. The speed increasing wheel train includes a worm and a worm wheel, and the centrifugal governor increases the frictional force of the rotating plate member against the sliding contact case when the rotational load applied to the lifting shaft increases when the blind member descends its own weight. When the rotational load is reduced, the frictional force of the rotating plate member on the sliding contact case is reduced. Furthermore, a one-way rotation transmission means for transmitting only the rotation of the lifting shaft to the rotating plate member when the blind member descends is provided along the inner peripheral surface of the worm wheel, so that when the blind member is raised, braking is performed. It is configured not to use the braking force of the device.

  In the blind device configured as described above, when the weight of the blind member is lowered, the braking force that varies the braking force to cope with the rotational load applied to the lifting shaft that changes in accordance with the weight of the portion not lowered to the predetermined position. Since the device is connected to the lifting / lowering shaft, a large braking force acts at the beginning of lowering when the rotational load on the lifting / lowering shaft is large, and the blind member is lowered at an appropriate speed. The power is reduced, and the blind member descends smoothly and surely to the end. In addition, since it has a speed increasing wheel train including a worm and a worm wheel and a centrifugal governor, the braking device has a compact configuration, and a very high speed increasing ratio can be obtained. The force can be made extremely small, and the braking force can be made extremely high at high speeds. Furthermore, since the braking device is provided with a one-way rotation transmission means so that the braking force of the braking device does not work when the blind member is raised, a light operating force is required when raising the blind member by operating the operating means. It is possible to rise.

Japanese Patent No. 3485164 (Claim 1, paragraphs [0120], [0122], [0122], FIGS. 3, 8, and 9)

  However, in the blind device disclosed in the above-mentioned conventional patent document 1, if the operating member is operated slowly to raise the blind member, the one-way rotation transmitting unit transmits the rotational force of the lifting shaft to the worm wheel. That is, since the rotation of the elevating shaft when the blind member ascends is transmitted to the rotating plate member, the braking force of the braking device works, and the operation load when raising the blind member increases, and the braking device There was a risk of noise increase due to operation.

  It is an object of the present invention to reliably prevent an increase in the operation load of the operation cord when the shield member is raised or lowered by the operation force of the operation cord and to prevent noise generated by the operation of the rotation speed suppressing means. An object of the present invention is to provide a solar shading device using a speed controller. Another object of the present invention is that the first gear can be reliably fixed to the main shaft when rotating in the direction opposite to the one direction of the main shaft, and noise generated by the operation of the rotation speed suppressing means can be prevented. To provide a controller.

  The first aspect of the present invention is, as shown in FIGS. 1 to 4, between the main shaft 18 rotatably inserted in the case 27 and fitted with the first gear 31, and between the main shaft 18 and the first gear 31. The first gear 31 is fixed to the main shaft 18 during rotation in one direction of the main shaft 18 and rotated together with the main shaft 18. When the main shaft 18 rotates in the direction opposite to the one direction, the first gear 31 is moved to the main shaft 18. A one-way clutch 33 for releasing the fixation, a first rotating shaft 41 provided in parallel with the main shaft 18 and integrally provided with a second gear 32 meshing with the first gear 31, and a worm wheel 41b provided integrally therewith. A second rotating shaft 42 that is three-dimensionally intersected with the first rotating shaft 41 and is provided so as to be movable in the axial direction by a predetermined amount and meshed with the worm wheel 41b, and a second rotating shaft 42; Case 27 Rotating speed suppressing means 34 for suppressing the rotating speed of the second rotating shaft 42 accompanying the rotation of the main shaft 18 and the first rotating shaft 41, and both ends of the second rotating shaft 42 can slide in the axial direction. The main shaft 18 of the first gear 31 by the one-way clutch 33 when the main shaft 18 rotates in a direction opposite to the one direction and the pair of bearing portions 36 and 37 that are rotatably held around the shaft. Rotation resistance applying means for applying resistance in a direction to stop the rotation of the second rotation shaft 42 when the second rotation shaft 42 is about to rotate via the first rotation shaft 41 without being released from being fixed to 38 is a speed controller.

  A second aspect of the present invention is an invention based on the first aspect, and as shown in FIGS. 1 and 2, the rotational resistance applying means 38 is provided in one of the pair of bearing portions 36 and 37. A conical taper bearing portion 38a that receives a thrust load generated in the second rotating shaft 42 as the worm 42a rotates by the worm wheel 41b when the main shaft 18 rotates in the direction opposite to the one direction, and the second rotation. A conical cone shaft portion 38b provided on the shaft 42 and pressed against the tapered bearing portion 38a by a thrust load generated on the second rotation shaft 42 when the main shaft 18 rotates in the direction opposite to the one direction. Features.

  As shown in FIGS. 5 and 6, the third aspect of the present invention is a head rail 12 that houses the speed controller 26 described in the first or second aspect, and is rotatably accommodated in the head rail 12. The main shaft 18 of the speed controller 26, the shielding member 13 suspended from the main shaft 18 via the lifting / lowering cord 17, the operation cord 22 for driving the main shaft 18 to raise and lower the shielding member 13, and the main shaft 18 in a locked state or The solar shading device uses a speed controller provided with a clutch 21 that switches to an unlocked state to make the main shaft 18 unrotatable or rotatable.

  According to a fourth aspect of the present invention, there is provided a winding pipe that houses the speed controller described in the first or second aspect and winds up the shielding member so that the shielding member can be pulled out, and the winding pipe can be rotated through the main shaft of the speed controller. A pair of supporting members that are supported by the winding pipe, and a winding spring that is housed in the winding pipe and interposed between the winding pipe and the main shaft and that stores spring force for rotating the shielding member in the winding direction of the winding pipe. Shielding solar radiation using a speed controller having a clutch that switches the winding pipe to a locked state or an unlocked state so that the winding pipe cannot be rotated or can rotate, and an operation cord attached to the drawing end of the shielding member Device.

  In the speed controller according to the first aspect of the present invention, when the main shaft is rotated in one direction, the one-way clutch fixes the first gear to the main shaft, so that the rotation of the main shaft is the second gear, the first rotating shaft, the worm wheel, It is transmitted to the second rotating shaft through the worm. As a result, the rotation speed suppression means suppresses the rotation speed of the second rotation shaft, thereby preventing the main shaft from over-rotating. On the other hand, if the main shaft is rotated relatively fast in the direction opposite to the one direction, the one-way clutch slips and the first gear is released from being fixed to the main shaft, so that the rotation of the main shaft is not transmitted to the second gear. As a result, since the second rotation shaft does not rotate, suppression of the rotation speed of the main shaft due to the operation of the rotation speed suppression means is avoided.

  On the other hand, if the main shaft is slowly rotated in the direction opposite to the one direction, the one-way clutch may not be slipped and the first gear may be kept fixed to the main shaft. In this case, since the rotation of the main shaft is transmitted to the second rotation shaft via the second gear, the first rotation shaft, the worm wheel, and the worm, the rotation speed suppression means tries to suppress the rotation speed of the second rotation shaft. . However, before the rotation speed of the second rotating shaft is suppressed, the rotation resistance applying means applies resistance in a direction to stop the rotation of the second rotating shaft, so that the slip of the one-way clutch is induced, and the one-way clutch causes The first gear is fixedly released from the main shaft. As a result, when the main shaft rotates in the direction opposite to the one direction, the fixing of the first gear to the main shaft can be reliably released, so the rotation speed suppression means does not suppress the rotation speed of the second rotation shaft, and accordingly Since the suppression of the rotation speed of the main shaft is avoided, the rotational operation force of the main shaft does not increase. Further, since the rotation speed suppressing means does not suppress the rotation speed of the second rotating shaft, noise generated by the operation of the rotation speed suppressing means can also be prevented.

  In the speed controller according to the second aspect of the present invention, when the main shaft is rotated in one direction, the one-way clutch fixes the first gear to the main shaft, so that the rotation of the main shaft is the second gear, the first rotating shaft, the worm wheel, It is transmitted to the second rotating shaft through the worm. At this time, since the cone shaft portion of the rotation resistance applying means is separated from the taper bearing portion, the rotation resistance applying means does not apply resistance to the second rotation shaft in the direction in which the rotation is stopped, but the rotation speed suppressing means is the second speed control means. Since the rotation speed of the rotation shaft is suppressed, over-rotation of the main shaft is prevented. On the other hand, if the main shaft is rotated relatively fast in the direction opposite to the one direction, the one-way clutch slips and the first gear is released from being fixed to the main shaft, so that the rotation of the main shaft is not transmitted to the second gear. As a result, since the second rotation shaft does not rotate, the rotation speed of the main shaft due to the operation of the rotation speed suppression means is not suppressed, and the rotation resistance applying means causes resistance in the direction in which the second rotation shaft stops its rotation. It is not granted.

  On the other hand, if the main shaft is slowly rotated in the direction opposite to the one direction, the one-way clutch may not be slipped and the first gear may be kept fixed to the main shaft. In this case, since the rotation of the main shaft is transmitted to the second rotation shaft via the second gear, the first rotation shaft, the worm wheel, and the worm, the rotation speed suppression means tries to suppress the rotation speed of the second rotation shaft. . However, before the rotation speed of the second rotating shaft is suppressed, the cone shaft portion of the rotation resistance applying means is pressed against the tapered bearing portion, and thereby resistance is applied in a direction in which the rotation of the second rotating shaft is stopped. Therefore, the slip of the one-way clutch is induced, and the fixing of the first gear to the main shaft by the one-way clutch is forcibly released. As a result, when the main shaft rotates in the direction opposite to the one direction, the fixing of the first gear to the main shaft can be reliably released, so the rotation speed suppression means does not suppress the rotation speed of the second rotation shaft, and accordingly Since the suppression of the rotation speed of the main shaft is avoided, the rotational operation force of the main shaft does not increase. Further, even if the cone shaft portion of the rotation resistance applying means is pressed against the tapered bearing portion, almost no noise is generated. Furthermore, since the rotation speed suppressing means does not suppress the rotation speed of the second rotating shaft, noise generated by the operation of the rotation speed suppressing means can also be prevented.

  In the solar radiation shielding device according to the third aspect of the present invention, when the clutch is switched so that the main shaft is unlocked by operating the operation cord, the shielding member is lowered by its own weight, so that the main shaft is interposed via the lifting cord. Rotate in one direction. When the main shaft rotates in one direction, the one-way clutch fixes the first gear to the main shaft, so that the rotation of the main shaft is transmitted to the second rotating shaft via the second gear, the first rotating shaft, the worm wheel, and the worm. As a result, the rotation speed suppressing means suppresses the rotation speed of the second rotation shaft, so that the spindle can be prevented from over-rotating and the lowering speed of the shielding member can be suppressed. On the other hand, when the operation cord is operated to raise the shielding member against its own weight, the main shaft rotates in the direction opposite to the one direction. At this time, if the operation cord is operated relatively fast and the main shaft rotates relatively fast in the direction opposite to the one direction, the one-way clutch slips and the first gear is released from being fixed to the main shaft. It is not transmitted to the second gear. As a result, since the second rotation shaft does not rotate, suppression of the rotation speed of the main shaft due to the operation of the rotation speed suppression means is avoided, and the operation load of the operation code does not increase.

  On the other hand, when the operation cord is operated slowly and the main shaft slowly rotates in the direction opposite to the one direction, the one-way clutch may not be slipped and the first gear may be kept fixed to the main shaft. In this case, since the rotation of the main shaft is transmitted to the second rotation shaft via the second gear, the first rotation shaft, the worm wheel, and the worm, the rotation speed suppression means tries to suppress the rotation speed of the second rotation shaft. . However, before the rotation speed of the second rotating shaft is suppressed, the rotation resistance applying means applies resistance in a direction to stop the rotation of the second rotating shaft, so that the slip of the one-way clutch is induced, and the one-way clutch causes The first gear is fixedly released from the main shaft. As a result, when the main shaft rotates in the direction opposite to the one direction, the fixing of the first gear to the main shaft can be reliably released, so that the rotation speed suppression means does not suppress the rotation speed of the second rotation shaft. Accordingly, suppression of the rotation speed of the main shaft is avoided, and the rotation operating force of the main shaft does not increase, so that it is possible to reliably prevent an increase in the operation load of the operation cord when the shielding member is raised by the operation force of the operation code. Further, since the rotation speed suppressing means does not suppress the rotation speed of the second rotating shaft, it is possible to prevent noise generated by the operation of the rotation speed suppressing means.

  In the solar radiation shielding device according to the fourth aspect of the present invention, when the clutch is switched so that the winding pipe is unlocked by operating the operation cord, the winding pipe is moved against the main shaft by the spring force of the winding spring. Thus, the shielding member is wound up by rotating in the opposite direction to the one direction, and the shielding member is lifted, so that the main shaft rotates in one direction relative to the winding pipe. When the main shaft relatively rotates in one direction, the one-way clutch fixes the first gear to the main shaft, so that the rotation of the main shaft is transmitted to the second rotation shaft via the second gear, the first rotation shaft, the worm wheel, and the worm. . As a result, the rotation speed suppressing means suppresses the rotation speed of the second rotating shaft, so that overwinding of the winding pipe is prevented and the rising speed of the shielding member can be suppressed. On the other hand, when the operation cord is operated to lower the shielding member against the spring force of the winding spring, the winding pipe rotates in one direction with respect to the main shaft, so that the main shaft is in a direction opposite to the one direction. Relative rotation. At this time, if the operation cord is operated relatively fast and the spindle rotates relatively fast in the direction opposite to the one direction, the one-way clutch slips and the first gear is released from being fixed to the spindle. The rotation is not transmitted to the second gear. As a result, since the second rotation shaft does not rotate, suppression of the relative rotation speed of the main shaft due to the operation of the rotation speed suppression means is avoided, and the operation load of the operation code does not increase.

  On the other hand, when the operation cord is operated slowly and the main shaft rotates slowly in the opposite direction to the one direction, the one-way clutch may not be slipped and the first gear may be kept fixed to the main shaft. In this case, since the relative rotation of the main shaft is transmitted to the second rotation shaft via the second gear, the first rotation shaft, the worm wheel, and the worm, the rotation speed suppression means tries to suppress the rotation speed of the second rotation shaft. To do. However, before the rotation speed of the second rotating shaft is suppressed, the rotation resistance applying means applies resistance in a direction to stop the rotation of the second rotating shaft, so that the slip of the one-way clutch is induced, and the one-way clutch causes The first gear is fixedly released from the main shaft. As a result, the first gear can be reliably fixed to the main shaft during the relative rotation of the main shaft in the direction opposite to the one direction, so that the rotation speed suppression means does not suppress the rotation speed of the second rotation shaft. Therefore, suppression of the relative rotational speed of the main shaft is avoided, and the rotating operation force of the winding pipe does not increase, so that an increase in the operation load of the operation cord when the shielding member is lowered due to the operation force of the operation cord can be reliably prevented. Further, since the rotation speed suppressing means does not suppress the rotation speed of the second rotating shaft, it is possible to prevent noise generated by the operation of the rotation speed suppressing means.

It is an internal block diagram which removed the cover part and fracture | ruptured the principal part which shows the state which the cone axial part of the speed controller of this invention embodiment left | separated from the taper bearing part. It is an internal block diagram corresponding to FIG. 1 which shows the state in which the cone axial part was press-contacted to the taper bearing part. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is the CC sectional view taken on the line of FIG. 6 which shows the state in which the speed controller was accommodated in the head rail of the solar radiation shielding apparatus. It is a side view of the solar radiation shielding apparatus.

  Next, an embodiment for carrying out the present invention will be described with reference to the drawings. The solar shading device is a horizontal blind. As shown in FIGS. 5 and 6, the horizontal blind 10 includes a head rail 12 that is attached to a wall surface or ceiling above an opening such as a window of a building via a mounting bracket 11. A ladder cord 14 that supports a plurality of horizontal slats 13 is suspended from the head rail 12. The ladder cord 14 includes a front cord 14a suspended from the head rail 12 to the front side of the horizontal slat 13, a rear cord 14b suspended from the head rail 12 to the rear side of the horizontal slat 13, and the front cord 14a and the rear cord. It has a horizontal cord 14c connecting the cord 14b. A plurality of horizontal cords 14c are provided at predetermined intervals in the vertical direction, and the ladder cord 14 is formed in a ladder shape as a whole by these horizontal cords 14c. A plurality of horizontal slats 13 are respectively mounted on a plurality of horizontal cords 14c in the ladder-like ladder cords 14, and the plurality of horizontal slats 13 are supported by the ladder cords 14 at equal intervals in the vertical direction. Is done. A bottle rail 16 is horizontally attached to the lower ends of the front cord 14 a and the rear cord 14 b constituting the ladder cord 14 so as to be parallel to the plurality of horizontal slats 13. Also, an elevating cord 17 that passes through a plurality of horizontal slats 13 and has a lower end attached to a bottle rail 16 is suspended from the head rail 12. When the lifting / lowering cord 17 is raised, the bottle rail 16 attached to the lower end of the lifting / lowering cord 17 is configured to rise by placing the horizontal slats 13 in sequence.

  On the other hand, a main shaft 18 provided extending in the longitudinal direction of the head rail 12 is rotatably accommodated in the head rail 12 (FIG. 5). The main shaft 18 is fitted with a take-up drum 19 for winding the elevating cord 17 so as to be able to be fed out. A pulley (not shown) is fitted to one end of the main shaft 18 via a clutch 21, and an operation cord 22 that rotates the main shaft 18 is wound around the pulley to raise and lower the horizontal slat 13. Most of the operation cords 22 are drawn out of the head rail 12 and suspended. The clutch 21 is configured to switch the main shaft 18 to a locked state or an unlocked state. When the clutch 21 switches the main shaft 18 to the locked state, the main shaft 18 becomes non-rotatable. When the clutch 21 switches the main shaft 18 to the unlocked state, the main shaft 18 becomes rotatable. Further, a tilt shaft 23 that extends in the longitudinal direction of the head rail 12 is rotatably accommodated in the head rail 12. A tilt drum 24 around which the upper end of the ladder cord 14 is wound is fitted to the tilt shaft 23, and a rotating operation rod (not shown) is connected to one end of the tilt shaft 23. By operating this rotation operating rod, the tilt shaft 23 is rotated, the front cord 14 a of the ladder cord 14 is wound around or fed out of the tilt drum 24, and the rear cord 14 b is moved from the tilt drum 24. The tilt angle of the horizontal slat 13 can be changed by being fed or wound on a tilt drum 24.

  On the other hand, the speed controller 26 is accommodated in the head rail 12 (FIG. 5). The speed controller 26 is provided near the other end of the main shaft 18. The main shaft 18 constitutes a part of the speed controller 26. As shown in FIGS. 1 to 3, the speed controller 26 is inserted between the main shaft 18 rotatably inserted into the case 27 and fitted with a first gear 31 (spur gear), and between the main shaft 18 and the first gear 31. A first rotary shaft 41 provided in parallel to the main shaft 18, and a second rotary shaft 42 that is three-dimensionally intersected with the first rotary shaft 41 and is movable by a predetermined amount in the axial direction. A rotation speed suppressing means 34 provided between the second rotating shaft 42 and the case 27, a pair of bearing portions 36 and 37 that rotatably hold both ends of the second rotating shaft 42, and a second rotating shaft. And a rotational resistance applying means 38 provided between one bearing portion 36 and the other bearing portion 36. The case 27 includes a case main body 27a and a lid body 27b, and is fixed to the head rail 12 (FIGS. 3 and 5). In the center of the case 27, a square hole shaft 39 passes through the case body 27a and the lid body 27b and is rotatably attached to the case body 27a and the lid body 27b (FIG. 3). The outer peripheral surface of the square hole shaft 39 is formed in a cylindrical shape, and the inner peripheral surface of the square hole shaft 39 is formed in a square hole 39a (FIGS. 1 to 3). A cylindrical spring loose fitting portion 39b having a larger diameter than the square hole shaft 39 is provided integrally with the square hole shaft 39 on the central outer peripheral surface in the longitudinal direction of the square hole shaft 39. A single slit 39 c is formed extending in the axial direction of the square hole shaft 39.

  The first gear 31 is rotatably fitted in the square hole shaft 39 (FIGS. 1 to 3). The first gear 31 is formed with a columnar spring insertion hole 31a having a hole diameter larger than the outer diameter of the spring loose fitting portion 39b. Furthermore, the one-way clutch 33 is constituted by a torsion coil spring in this embodiment. At one end of the torsion coil spring 33, a locking portion 33a is formed by bending the one end inward in the radial direction. The torsion coil spring 33 is inserted into the spring insertion hole 31 a of the first gear 31. In this state, the first gear 31 is inserted into the spring loose fitting portion 39 b of the square hole shaft 39 and the torsion coil spring 33 is engaged. By inserting the stop portion 33a into the slit 39c, the stop portion 33a is mounted in the space between the spring loose fitting portion 39b and the spring insertion hole 31a. The square hole shaft 39 is configured to rotate together with the main shaft 18 by inserting a portion formed in the rectangular column of the main shaft 18 into the square hole 39 a of the square hole shaft 39. When the square hole shaft 39 rotates together with the main shaft 18 in one direction, that is, the direction indicated by the broken line arrow in FIG. 1, the coil diameter of the torsion coil spring 33 tends to increase, and the inner surface of the spring insertion hole 31a of the torsion coil spring 33 is increased. Since the adhesion force increases, the frictional resistance generated between the torsion coil spring 33 and the spring insertion hole 31 a becomes extremely large, the first gear 31 is fixed to the main shaft 18, and the first gear 31 is connected to the main shaft 18 together with the main shaft 18. Rotate in the same direction. When the square hole shaft 39 rotates together with the main shaft 18 in the direction opposite to the one direction, that is, the direction indicated by the broken-line arrow in FIG. 2, the coil diameter of the torsion coil spring 33 is reduced, and the spring insertion hole 31a of the torsion coil spring 33 is reduced. Accordingly, the frictional resistance generated between the torsion coil spring 33 and the spring insertion hole 31a becomes extremely small, and the first gear 31 is fixed to the main shaft 18 and the first gear 31 is released. Does not rotate with the main shaft 18.

  On the other hand, the first rotating shaft 41 penetrates the case main body 27a and the lid body 27b in the upper part of the case 27 and is rotatably attached to the case main body 27a and the lid body 27b (FIG. 3). A cylindrical round hole 41a is formed in the first rotating shaft 41 (FIGS. 1 to 3). A second gear 32 (spur gear) that is smaller in diameter than the first gear 31 and meshes with the first gear 31 is provided integrally with the first rotation shaft 41 at the center in the longitudinal direction of the first rotation shaft 41. Further, the first rotating shaft 41 is provided with a worm wheel 41 b integrally with the first rotating shaft 41. The worm wheel 41b is provided integrally with the first rotary shaft 41 so that the surface of the case main body 27a and the lid 27b extending from the connection surface is aligned with the center of the tooth width parallel to the side surface of the worm wheel 41b. (FIG. 3).

  On the other hand, the second rotating shaft 42 is three-dimensionally intersected with the first rotating shaft 41 and moved by a predetermined amount in the axial direction so that its axis is located in a surface obtained by extending the connection surface of the case main body 27a and the lid 27b. It is provided as possible (FIGS. 1 to 3). That is, both ends of the second rotating shaft 42 are slidable in the axial direction by a pair of bearing portions 36 and 37 sandwiched between the case main body 27a and the lid body 27b, and are held rotatably about the shaft. Configured to be. A worm 42 a that meshes with the worm wheel 41 b is provided integrally with the second rotation shaft 42 on the second rotation shaft 42. Further, the rotational speed suppressing means 34 is a dish provided integrally with the rubber pressure contact member 43 fitted to the lower portion of the second rotation shaft 42 and one of the pair of bearing portions 36 and 37. Shaped receiving member 44. The pressure contact member 43 includes a base portion 43a fitted to the second rotating shaft 42, and a pair of centrifugally deforming portions 43b that protrude outward in the radial direction from the outer peripheral surface of the base portion 43a and are formed in a substantially Z shape centering on the base portion 43a. 43b (FIG. 4). The receiving member 44 includes a disc portion 44a provided integrally with the one bearing portion 36, a cylindrical portion 44b projecting upward from the outer peripheral edge of the disc portion 44a, and a lower surface of the disc portion 44a. And a pair of parallel locking portions 44c and 44c (FIGS. 1 to 4) that prevent the receiving member 44 from rotating with respect to the case 27. When the pressing member 43 rotates in the direction of the two-dot chain line in FIG. 4 as the second rotating shaft 42 rotates, the centrifugal deformation portion 43b spreads outward by centrifugal force, and the rotational speed suppressing means 34 The portion 43 b is pressed against the inner peripheral surface of the cylindrical portion 44 b of the receiving member 44 and has a function of suppressing the rotation speed of the second rotating shaft 42.

  On the other hand, the rotation resistance applying means 38 includes a conical tapered bearing portion 38 a provided in one bearing portion 36 of the pair of bearing portions 36 and 37, and a conical shape provided below the second rotating shaft 42. Cone shaft portion 38b (FIGS. 1 and 2). The taper bearing portion 38a receives a thrust load in the direction of the alternate long and short dash line in FIG. 2 generated on the second rotating shaft 42 as the worm wheel 41b rotates by the worm wheel 41b when the main shaft 18 rotates in the direction opposite to the one direction. Configured as follows. The cone shaft portion 38b is configured to be brought into pressure contact with the tapered bearing portion 38a by the thrust load generated in the second rotating shaft 42 when the main shaft 18 rotates in the direction opposite to the one direction. When the main shaft 18 rotates in the direction opposite to the one direction, the rotation resistance applying means 38 is not released from fixing the first gear 31 to the main shaft 18 by the one-way clutch 33, and the second rotation shaft 42 is released. Has a function of imparting resistance to the second rotating shaft 42 in a direction to stop the rotation when trying to rotate through the first rotating shaft 41.

  The operation of the horizontal blind 10 using the speed controller 26 configured as described above will be described. When the clutch 21 is switched so that the main shaft 18 is unlocked by operating the operation cord 22, the horizontal slat 13 is lowered by its own weight, so that the main shaft 18 passes through the lifting / lowering cord 17 and the winding drum 19. Rotate in one direction. When the main shaft 18 rotates in one direction, that is, when the main shaft 18 rotates in the direction indicated by the broken line arrow in FIG. 1, the coil diameter of the torsion coil spring 33 constituting the one-way clutch tends to increase, and the spring insertion of the torsion coil spring 33 is performed. Since the adhesion force to the inner surface of the hole 31 a increases, the frictional resistance generated between the torsion coil spring 33 and the spring insertion hole 31 a becomes extremely large, and the first gear 31 is fixed to the main shaft 18. Thereby, the rotation of the main shaft 18 is transmitted to the second rotation shaft 42 via the square hole shaft 39, the first gear 31, the second gear 32, the first rotation shaft 41, the worm wheel 41b and the worm 42a. As a result, when the pressure contact member 43 of the rotation speed suppressing means 34 rotates in the direction indicated by the two-dot chain line arrow in FIG. 4 along with the rotation of the second rotation shaft 42, the centrifugal deformation portion 43b expands outward due to the centrifugal force. The centrifugally deforming portion 43b is pressed against the inner peripheral surface of the cylindrical portion 44b of the receiving member 44, and the rotational speed of the second rotating shaft 42 is suppressed, so that the spindle 18 is prevented from over-rotating and the horizontal slat 13 descends. Can be suppressed.

  On the other hand, when the operation cord 22 is operated to raise the horizontal slat 13 against its own weight, the main shaft 18 rotates in a direction opposite to the one direction, that is, the main shaft 18 is a direction indicated by a broken line arrow in FIG. Rotate to. At this time, when the operation cord 22 is operated relatively quickly and the main shaft 18 rotates relatively fast in the direction opposite to the one direction, the one-way clutch 33 slips. Specifically, the torsion coil spring 33 constituting the one-way clutch. Since the coil diameter of the torsion coil spring 33 is reduced and the adhesion force of the torsion coil spring 33 to the inner surface of the spring insertion hole 31a is reduced, the frictional resistance generated between the torsion coil spring 33 and the spring insertion hole 31a becomes extremely small. The fixing of the first gear 31 to the main shaft 18 is released, and the rotation of the main shaft 18 is not transmitted to the second gear 32. As a result, since the second rotating shaft 32 does not rotate, suppression of the rotation speed of the main shaft 18 due to the operation of the rotation speed suppressing means 34 is avoided, and the operation load of the operation cord 22 does not increase.

  On the other hand, when the operation cord 22 is operated slowly and the main shaft 18 rotates slowly in the direction opposite to the one direction, that is, when the main shaft 18 rotates slowly in the direction indicated by the broken line arrow in FIG. 2, the one-way clutch 33 does not slip. The first gear 31 may be kept fixed to the main shaft 18 in some cases. Specifically, the coil diameter of the torsion coil spring 33 constituting the one-way clutch is reduced, the adhesion force of the torsion coil spring 33 to the inner surface of the spring insertion hole 31a is reduced, and the torsion coil spring 33 and the spring are inserted. Although the frictional resistance generated between the holes 31a is reduced, the contact area between the torsion coil spring 33 and the insertion hole 31a is relatively wide, so that a slight frictional resistance remains between the torsion coil spring 33 and the spring insertion hole 31a. Then, the first gear 31 may be dragged and rotated by the rotation of the main shaft 18. In this case, the rotation of the main shaft 18 is transmitted to the second rotation shaft 42 via the square hole shaft 39, the first gear 31, the second gear 32, the first rotation shaft 41, the worm wheel 41b and the worm 42a. The speed suppressing means 34 tries to suppress the rotational speed of the second rotating shaft 42. However, before the rotation speed of the second rotation shaft 42 is suppressed, the rotation resistance applying means 38 applies resistance in the direction in which the rotation of the second rotation shaft 42 is stopped, that is, the cone shaft portion 38b is the second rotation shaft. 2 is pressed against the tapered bearing portion 38a by the thrust load in the direction of the one-dot chain line in FIG. 2, so that the slip of the one-way clutch 33 is induced and the one-way clutch 33 fixes the first gear 31 to the main shaft 18. It is forcibly released. As a result, the fixing of the first gear 31 to the main shaft 18 can be reliably released when the main shaft 18 rotates in the direction opposite to the one direction, so that the rotation speed suppression means 34 suppresses the rotation speed of the second rotation shaft 42. There is nothing. Accordingly, suppression of the rotational speed of the main shaft 18 is avoided, and the rotational operating force of the main shaft 18 does not increase, so that it is possible to reliably increase the operation load of the operation cord 22 when the horizontal slat 13 is raised by the operating force of the operation cord 22. Can be prevented. Further, even if the cone shaft portion 38b of the rotation resistance applying means 38 is pressed against the tapered bearing portion 38a, almost no noise is generated. Furthermore, since the rotation speed suppression means 34 does not suppress the rotation speed of the second rotation shaft 42, noise generated by the operation of the rotation speed suppression means 34 can be prevented.

  In the above embodiment, the speed controller is applied to a horizontal blind. However, the speed controller is applied to a solar shading device such as a roman shade, a roll screen, or a book, a shutter door, a hoist (crane), The present invention may be applied to an open / close door of household appliances (for example, an open / close lid of a CD (Compact Disc) or DVD (Digital Versatile Disc) player or recorder). Here, when the speed controller is applied to a roman shade, when the cloth (shielding member) is unfolded (descent), the speed controller's rotation speed suppression means suppresses the cloth unfolding speed (descent speed) and the cloth is folded. The rotational load imparting means of the speed controller imparts resistance to the second rotating shaft at the time of ascent (to raise), thereby securely releasing the first gear from being fixed to the main shaft. Reduce. When the speed controller is applied to a roll screen, when the screen (shielding member) is wound (when it is raised), the speed controller's rotation speed suppression means suppresses the screen's winding speed (ascending speed) and when the screen is pulled out. The rotation resistance applying means of the speed controller applies resistance to the second rotating shaft at the time of lowering to reliably release the fixing of the first gear to the main shaft, thereby reducing the operation load when the screen is pulled out (descent). Reduce. Moreover, in the said embodiment, although the 1st and 2nd gearwheel was comprised by the spur gear, you may comprise the 1st and 2nd gearwheel by the helical gear.

10 Horizontal blind (sunlight shielding device)
12 Head rail 13 Horizontal slat (shielding member)
17 Lift code 18 Main shaft 21 Clutch 22 Operation code 26 Speed controller 27 Case 31 First gear 32 Second gear 33 Torsion coil spring (one-way clutch)
34 Rotational speed suppression means 36, 37 Bearing portion 38 Rotational resistance applying means 38a Tapered bearing portion 38b Cone shaft portion 41 First rotation shaft 41b Worm wheel 42 Second rotation shaft 42a Worm

Claims (4)

A main shaft (18) rotatably inserted into the case (27) and fitted with a first gear (31);
The first gear (31) is fixed to the main shaft (18) when the main shaft (18) is rotated in one direction and is provided between the main shaft (18) and the first gear (31). A one-way clutch (33) that rotates together with (18) and releases the fixation of the first gear (31) to the main shaft (18) when the main shaft (18) rotates in the direction opposite to the one direction;
A first rotating shaft (1) provided integrally with a second gear (32) provided in parallel with the main shaft (18) and meshing with the first gear (31) and integrally provided with a worm wheel (41b). 41) and
A second rotating shaft (42) integrally provided with a worm (42a) that intersects the first rotating shaft (41) and is movable by a predetermined amount in the axial direction and meshes with the worm wheel (41b). )When,
The rotational speed of the second rotating shaft (42) provided between the second rotating shaft (42) and the case (27) according to the rotation of the main shaft (18) and the first rotating shaft (41). Rotational speed suppression means (34) for suppressing,
A pair of bearing portions (36, 37) that are slidable in the axial direction at both ends of the second rotating shaft (42) and rotatably held around the shaft;
When the main shaft (18) rotates in the direction opposite to the one direction, the first gear (31) is not fixed to the main shaft (18) by the one-way clutch (33) without being released. Rotation resistance applying means (38) for applying resistance to the second rotation shaft (42) in a direction in which the rotation is stopped when the rotation shaft (42) tries to rotate via the first rotation shaft (41). ) And speed controller.   The rotation resistance applying means (38) is provided in one of the pair of bearing portions (36, 37), and the main shaft (18) is rotated by the worm wheel (41b) when rotating in the direction opposite to the one direction. A conical taper bearing (38a) that receives a thrust load generated on the second rotating shaft (42) as the worm (42a) rotates, and the main shaft (18) provided on the second rotating shaft (42). ) Having a conical cone shaft portion (38b) pressed against the tapered bearing portion (38a) by a thrust load generated on the second rotation shaft (42) when rotating in the direction opposite to the one direction. Item 1. The speed controller according to item 1. A head rail (12) for accommodating the speed controller (26) according to claim 1 or 2,
A main shaft (18) of the speed controller (26) rotatably accommodated in the head rail (12);
A shielding member (13) suspended from the main shaft (18) via an elevating cord (17);
An operation cord (22) for driving the spindle (18) to raise and lower the shielding member (13);
A solar radiation shielding device using a speed controller comprising: a clutch (21) that switches the main shaft (18) to a locked state or an unlocked state to make the main shaft (18) unrotatable or rotatable. A take-up pipe in which the speed controller according to claim 1 or 2 is accommodated and the shielding member is retractably wound;
A pair of support members for rotatably supporting the winding pipe via the main shaft of the speed controller;
A winding spring housed in the winding pipe and interposed between the winding pipe and the main shaft and storing a spring force for rotating the shielding member in a winding direction of the winding pipe;
A clutch that switches the winding pipe to a locked state or an unlocked state to make the winding pipe unrotatable or rotatable;
A solar radiation shielding device using a speed controller comprising: an operation cord attached to a drawing end of the shielding member.

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