JP4909769B2 - Lifting and rotating device for blinds - Google Patents

Description

  The present invention relates to an elevating and rotating device for blinds that moves up and down and rotates blind slats.

  2. Description of the Related Art Conventionally, as this type of blind lifting and rotating device, the one described in Patent Document 1 is known. The one described in Patent Document 1 has a drum receiver, a rotating drum, a winding drum, a spline member, and a rotating shaft. The rotating drum is attached to a drum receiver attached to the head box. A rudder cord is connected to a rotating drum that is rotatably supported and rotates integrally with the rotating shaft, and a support ring that rotates integrally with a predetermined angle range, and a winding drum in which the upper end of the lifting / lowering cord is connected to the inner diameter portion of the rotating drum is provided. In addition, a spline member is provided on the inner diameter portion of the winding drum so as not to be relatively rotatable and to be relatively movable in the axial direction. The spline member cannot move relative to the rotating drum in the axial direction, and the protrusion formed on the spline member is stopped by the protrusion provided in the circumferential direction of the rotating drum until the rotating drum and the spline. It can rotate relative to the member.

  Further, the rotating drum is provided with a stopper that is constantly pressed to the storage position side by a spring, and the spline member is provided with a protruding piece that can project the stopper when the spline member rotates relative to the rotating drum by a predetermined amount or more. An internal tooth portion that can mesh with the protruding stopper is provided on the drum receiver.

  As a result, the rotary drum and the take-up drum can rotate relative to each other by a predetermined angle, so that the take-up drum does not move even if the rotary shaft is rotated in reverse to adjust the angle of the slat after the slat is lowered to the lowest position. Since only the rotating drum rotates without rotating, the angle can be adjusted without raising the slats.

Japanese Patent No. 2695553

  However, in the elevating and rotating apparatus disclosed in the cited document 1, the take-up drum rotates after the rotary drum rotates about 180 ° relative to the take-up drum, and the rotary drum rotates about 180 °. Thus, the slat rotates about 180 °. For this reason, in order to ensure the amount of movement of the ladder cord that supports the slats in an aligned state, it is necessary to increase the diameter of the rotating drum. If the diameter of the rotating drum is decreased, the range in which the slats can rotate is narrowed. There is a problem. However, if the diameter of the rotating drum is large, the operation load cannot be reduced.

  In addition, when the angle of the slat is adjusted while the slat is at the lowest limit position, the rotating drum can rotate about 180 ° relative to the winding drum. The winding drum may also follow and rotate within a range in which only the rotating drum rotates due to a slight frictional resistance between them. As a result, the angular position at which the stopper is hooked on the inner teeth of the drum receiver is shifted, and the rotation drum cannot be rotated by the stopper before the slats are completely closed, or the winding drum follows and rotates. There is a problem that the elevating cord is wound up and the slat rises from the lowest position.

  The present invention has been made in view of such problems, and a first object is to provide a blind lifting and rotating device capable of reducing the diameter of the drum and reducing the operation load.

  Further, the second purpose is to raise and lower the blind for ensuring the amount of rotation of the rotating drum or preventing the slat from rising when the angle of the slat is adjusted while the slat is at the lowest position. It is to provide a rotating device.

In order to achieve the above-mentioned object, the invention according to claim 1 is a drum receiver mounted in a head box, and is rotatably supported by the drum receiver and supports the slats in an aligned state for rotation within a predetermined rotation range. to follow the ladder cord to by tilting operation, to solve winding and winding the lift cords so as to lift the rotary drum which does not follow the ladder cord, one end is connected slat lift cords against further rotation In a lifting and rotating device for a blind, which is provided with a winding drum, and the rotating drum can rotate integrally with a drive shaft that rotates in conjunction with an operation from an operation unit.
Engagement / non-engagement is switched depending on the relative angular relationship with the rotating drum, and it can rotate relative to the rotating drum in the disengaged state, and can rotate integrally with the rotating drum in the engaged state, And a differential shaft that can be rotated relative to the take-up drum in the disengaged state and can rotate integrally with the take-up drum in the engaged state. The differential shaft is disposed in the winding drum, and the rotation of the rotating drum can be transmitted to the winding drum via the differential shaft.

  Here, the engaged state means that a force can be applied from one member to the other member, and the non-engaged state means that a force cannot be applied from one member to the other member. Shall.

  According to a second aspect of the present invention, the differential shaft according to the first aspect is further provided with a stopper accommodating portion for accommodating a stopper capable of projecting in the outer peripheral direction of the differential shaft, and the winding drum includes: A protrusion that can press the stopper in the protruding direction is provided, and a locked portion that can be locked with the protruding stopper is provided on the drum receiver, and the protrusion is formed by relative rotation between the differential shaft and the winding drum. When the stopper is pressed against the locked portion, the further rotation of the differential shaft and the rotating drum is restricted.

  According to a third aspect of the present invention, the winding drum according to the second aspect of the present invention is configured such that after the protrusion presses the stopper, the winding drum rotates with the differential shaft until the stopper is locked to the locked portion, and the lifting / lowering cord is It is characterized by unwinding.

  The invention described in claim 4 is characterized in that the locked portion described in claim 3 is provided only in one place in the circumferential direction of the drum receiver.

  According to the present invention, by using the differential shaft, the rotary drum is in a non-engagement state with the differential shaft, the rotary drum rotates relative to the differential shaft, and the differential shaft further takes up the winding drum And the differential shaft can rotate relative to the take-up drum in a non-engaged state, and as a result, the range in which the rotary drum can rotate relative to the take-up drum can be expanded. The relative rotation range of the drum can be assigned to the movement amount of the ladder code corresponding to the rotation range of the slat. Since a large relative rotation range of the rotary drum can be secured, the outer diameter of the drum can be reduced, the operation load can be reduced, and the apparatus can be downsized. Further, since the differential shaft is disposed in the winding drum, the apparatus can be further downsized.

  According to the second aspect of the present invention, by providing the stopper on the differential shaft, the lifting / lowering cord is loosened or the slat reaches the lowest position, and the relative rotation is performed between the differential shaft and the winding drum. In order to restrict the rotation of the rotating drum when the stopper protrudes and locks to the locked part when it occurs, the unwinding of the lifting / lowering cord from the winding drum is prevented to prevent malfunction. Can do.

  According to the third aspect of the present invention, when the stopper is at the lowermost limit position, the lifting / lowering cord is unwound unnecessarily until the stopper is operated and the rotation of the rotating drum is restricted. For this reason, even when the winding drum is moved following the rotating drum while the rotating drum is rotating in the relative rotation range of the rotating drum, there is a margin for unwinding the lifting code, It is possible to prevent the slats from rising. Thus, the relative rotation range of the rotating drum can be ensured without raising the slats.

  According to a fourth aspect of the present invention, even if the take-up drum moves while the rotary drum is rotating in the relative rotation range of the rotary drum and the angular position of the take-up drum is shifted, the stopper is locked. Since the to-be-engaged part is one place, the rotatable range of the rotating drum can be prevented from changing. In addition, the winding drum can be returned to the correct angular position by locking the stopper to the locked portion.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a blind to which the blind lifting and rotating apparatus of the present invention is applied. In the figure, reference numeral 10 denotes a head box, and a slat 14 is supported in an aligned state by a ladder cord 12 suspended from the head box 10. The lower end of the ladder cord 12 is connected to a bottom rail 16 provided below the slat 14. Further, the lifting cord 18 suspended from the head box 10 is inserted through the slat 14 and the lower end thereof is connected to the bottom rail 16.

  In the head box 10, the blind elevating / rotating device 20 of the present invention into which the upper ends of the ladder cord 12 and the elevating cord 18 are introduced is arranged corresponding to the cord. A drive shaft 22 that is rotatable in the head box 10 passes through the blind lifting and rotating device 20. The drive shaft 22 is connected to an operation unit disposed at the end of the blind via the operation device 24, and the drive shaft 22 can rotate in any direction in conjunction with the operation unit based on the operation of the operation unit. It has become.

  2 is a perspective view of a lifting and rotating device for blinds, FIG. 3 is an exploded perspective view of the main part viewed from the rear, FIG. 4 is a longitudinal sectional view, and FIG. 5 is a plan view with a part omitted.

  The blind elevating and rotating device 20 mainly includes a drum receiver 30 mounted in the head box 10, a rotating drum 32 rotatably supported by the drum receiver 30, and a winding drum 34 provided in parallel with the rotating drum 32. And a differential shaft 36 disposed in the take-up drum 34.

  The rotating drum 32 is supported by the drum receiver 30 with a bearing 33, and the upper end of the ladder cord 12 is stretched over the rotating drum 32. The ladder code 12 tilts to follow the rotation of the rotary drum 32 within a certain range to rotate the slat 14 and does not follow any further rotation of the rotary drum 32. The ladder cord 12 passes through a bottom hole formed in the bottom of the drum receiver 30 and is suspended from the head box 10.

  The central hole 32a of the rotary drum 32 has a non-circular cross section, and is fitted to the drive shaft 22 having a non-circular cross section so that the drive shaft 22 and the rotary drum 32 rotate together. The rotary drum 32 is further provided with a drive shaft portion 32b extending into the take-up drum 34, and two protrusions 32c are formed on the outer peripheral surface of the drive shaft portion 32b at intervals of 180 degrees in the circumferential direction. Yes.

Two ribs 36 a are formed at an interval of 180 degrees in the circumferential direction on the outer peripheral surface of the differential shaft 36 disposed in the winding drum 34, and the rib 36 a is more rotatable than the main body of the differential shaft 36. It protrudes toward 32. The protrusion 36b of the protruding rib 36a can interfere with the protrusion 32c of the rotating drum 32. The protrusion 32c and the protrusion 36b allow the differential shaft 36 and the rotating drum 32 to correspond to each other relative angular relationship. To engage or disengage. Since each of the protrusions 32c and 36b is formed at intervals of 180 degrees in the circumferential direction, the load applied at the time of engagement can be distributed in a balanced manner and stable rotation can be performed.

  The winding drum 34 is rotatably supported by the drum receiver 30, and a cord receiving portion 34 a is provided at one end of the outer peripheral surface thereof, and the upper end of the lifting / lowering cord 18 is connected to the cord receiving portion 34 a. The lifting / lowering cord 18 is wound on the outer peripheral surface of the winding drum 34, or the lifting / lowering cord 18 is unwound from the outer peripheral surface of the winding drum 34, and the lifting / lowering cord 18 is formed on the drum receiver 30. It passes through the formed cord insertion hole 30a and hangs down from the head box 10.

  As shown in FIG. 7, two ribs 34 b are formed at an interval of 180 degrees in the circumferential direction on the inner peripheral surface of the winding drum 34, and the ribs 34 b can interfere with the ribs 36 a of the differential shaft 36. It has become. By the rib 34b and the rib 36a, the winding drum 34 and the differential shaft 36 are engaged or disengaged depending on the relative angular relationship with each other. Since the ribs 34b and the ribs 36a are each formed at intervals of 180 degrees in the circumferential direction, the load applied at the time of engagement can be distributed in a well-balanced manner and stable rotation can be performed.

  The differential shaft 36 is further provided with a stopper accommodating portion 36c that protrudes from the winding drum 34 and has an enlarged diameter. As shown in FIGS. 3, 8, and 9, the stopper storage portion 36c is formed with a stopper opening 36d on the side peripheral surface thereof, and slits 36e and 36f are formed on the left and right end surfaces of the stopper storage portion 36c. Is done.

  A stopper 38 and a stopper spring 40 are accommodated in the stopper accommodating portion 36c. The stopper 38 is formed with claw portions 38a and protrusions 38b and 38c that are slidably fitted into the slits 36e and 36f. By fitting the projection 38c into the slit 36f, the stopper 38 is prevented from coming off from the stopper accommodating portion 36c, and the stopper 38 is movable within the stopper accommodating portion 36c within a range in which the projection 38c can move through the slit 36f. The claw portion 38a can protrude from the stopper opening 36d in the outer peripheral direction. Normally, the claw portion 38a is urged by the stopper spring 40 to the position where it is retracted from the stopper opening 36d. The protrusion 38b protrudes from the slit 36e toward the winding drum 34.

  A protrusion 34 c that can interfere with the protrusion 38 b of the stopper 38 is formed on the end surface of the winding drum 34 on the counter-rotating drum side.

  Further, a protrusion 30b as a locked portion that can interfere with the claw portion 38a of the stopper 38 protruding in the outer peripheral direction from the stopper opening 36d is provided on the inner peripheral surface of the drum receiver 30 in one circumferential direction. Yes.

  The operation of the blind lifting and rotating apparatus configured as described above will be described.

  When the operation unit is operated, the drive shaft 22 can be rotated, and the rotating drum 32 rotates with the rotation.

  When the drive shaft 22 is rotated in the slat ascending direction, as shown in FIGS. 6A and 7A, the protrusion 32c of the rotary drum 32 is engaged with the protrusion 36b of the differential shaft 36. In addition, since the rib 36a of the differential shaft 36 is engaged with the rib 34b of the take-up drum 34, the rotary drum 32, the differential shaft 36 and the take-up drum 34 rotate integrally. In this way, the bottom rail 16 and the slats 14 are raised so that the winding drum 34 winds the lifting cord 18.

  On the contrary, when the drive shaft 22 is rotated in the slat descending direction, as shown in FIGS. 6 (a) and 7 (a), the winding drum 34 is connected to the bottom rail 16 and the lift cord 18. Since the dead weight of the slat 14 acts, the rib 34b of the winding drum 34 is engaged with the rib 36a of the differential shaft 36, and the protrusion 36b of the differential shaft 36 is the protrusion 32c of the rotary drum 32. Therefore, the rotary drum 32, the differential shaft 36, and the take-up drum 34 rotate integrally. Thus, the bottom rail 16 and the slat 14 are lowered so that the winding drum 34 unwinds the lifting / lowering cord 18.

  When the rotation of the drive shaft 22 is blocked, as shown in FIGS. 6A and 7A, the take-up drum 34 receives the weight of the bottom rail 16 and the slat 14 via the lifting / lowering cord 18. In this state, the rib 34b of the take-up drum 34 is engaged with the rib 36a of the differential shaft 36, and the protrusion 36b of the differential shaft 36 is engaged with the protrusion 32c of the rotary drum 32. The rotary drum 32, the differential shaft 36, and the take-up drum 34 are stopped together, and the bottom rail 16 and the slat 14 are stopped at the height position.

  Consider a state where the slat 14 is lowered to the lowest position and stopped. In this state, since the slat 14 and the bottom rail 16 are at the lowest position determined by the ladder cord 12, the weight of the bottom rail 16 and the slat 14 does not act on the winding drum 34 via the lifting / lowering cord 18. When the drive shaft 22 is further rotated in the slat lowering direction from this state, the protrusion 36 b of the differential shaft 36 does not engage with the protrusion 32 c of the rotary drum 32, so that the rotary drum 32 is relative to the differential shaft 36. By rotating, the state shown in FIGS. 6 (a) and 7 (a) is changed to the state shown in FIGS. 6 (b) and 7 (b). Since the protrusion 32c of the rotating drum 32 is engaged with the protrusion 36b of the differential shaft 36, the rotating drum 32 and the differential shaft 36 rotate together. However, since the rib 36 a of the differential shaft 36 and the rib 34 b of the winding drum 34 are not engaged, the winding drum 34 does not rotate, and a relative rotation occurs between the winding drum 34 and the differential shaft 36.

  6C, 7C, and 8C, the protrusion 38b of the stopper 38 that moves together with the differential shaft 36 interferes with the protrusion 34c of the winding drum 34, and the stopper 38 It protrudes from the stopper accommodating part 36c in the outer peripheral direction. Further, since the rib 36a of the differential shaft 36 and the rib 34b of the winding drum 34 are engaged, the winding drum 34 also rotates. For this reason, the lifting / lowering cord 18 is further unwound from the winding drum 34.

  6 (d), 7 (d), and 8 (d), the claw portion 38a of the stopper 38 is locked to the protrusion 30b of the drum receiver 30, and further rotation is restricted. The operator senses the inoperability through the drive shaft 22 and stops further operations.

  When the operating unit is operated from this state and the drive shaft 22 is rotated in the opposite direction, the rotary drum 32 rotates in the opposite direction, but the protrusion 32c of the rotary drum 32 and the protrusion 36b of the differential shaft 36 are engaged. Therefore, the rotary drum 32 rotates about 110 degrees relative to the differential shaft 36. Further, since the rib 36 a of the differential shaft 36 and the rib 34 b of the winding drum 34 are not engaged, the differential shaft 36 rotates about 110 degrees relative to the winding drum 34. That is, the rotary drum 32 can rotate about 220 degrees relative to the take-up drum 34. Within this range, the slat 14 is rotated and the angle is adjusted without taking up and unwinding the lifting / lowering cord 18. be able to. However, during this relative rotation, there is a possibility that the take-up drum 34 rotates with the rotary drum 32 due to frictional resistance. In this case, the take-up drum 34 rotates in the direction in which the elevating cord 18 is taken up. Can happen. However, since the lifting / lowering cord 18 is unwinded from the winding drum 34 as described above, even if the lifting / lowering cord 18 is wound, it is possible to prevent the bottom rail 16 and the slat 14 from rising. it can.

  Further, even if the winding drum 34 rotates together with the rotating drum 32 due to frictional resistance as described above and the angular position thereof is shifted, the winding drum 34 is rotated again, and FIG. 7D and 8D, the claw portion 38a of the stopper 38 is engaged with the protrusion 30b of the drum receiver 30, so that the angular relationship between the rotary drum 32 and the take-up drum 34 is correct. Can be returned to.

  The above stopper 38 acts not only when the slat 14 is at the lowest position, but also when the bottom rail 16 abuts against an obstacle when it is descending. When the bottom rail 16 comes into contact with an obstacle, the self-weight is not transmitted to the winding drum 34 via the lifting / lowering cord 18, so that the winding drum 34 stops rotating and is interposed between the winding drum 34 and the rotating drum 32. Since relative rotation occurs, the stopper 38 protrudes in the outer circumferential direction and is locked to the protrusion 30 b of the drum receiver 30. As a result, the operator senses the inoperability through the drive shaft 22 and can stop further operations. Therefore, it is possible to prevent the lifting / lowering cord 18 from loosening and causing malfunction.

  According to this embodiment, by using the differential shaft 36, the rotating drum 32 can be relatively rotated by about 220 degrees without rotating the winding drum 34. Can be assigned to the movement amount of the ladder code 12 corresponding to the rotation range. That is, since the relative rotation range of the rotating drum 32 can be ensured, the outer diameter of the rotating drum 32 can be reduced. By reducing the outer diameter of the drum in this way, the operation load can be reduced and the apparatus can be miniaturized. Since the main body of the differential shaft 36 is disposed in the winding drum 34, an extra space for the differential shaft 36 is not required, and the apparatus can be miniaturized. It is also possible to further increase the relative rotation amount by narrowing the width of the protrusions and ribs.

  Even if the take-up drum 34 is caught and rotated between the relative rotation ranges of the rotary drum 32, the take-up drum 34 rotates before the stopper 38 is actuated so as to move up and down in advance. Since the cord 18 is unwound, the slat 14 can be prevented from rising. Thus, the relative rotation range of the rotary drum 32 can be ensured without the slat 14 rising.

  Even if the take-up drum 34 is caught and rotated between the relative rotation ranges of the rotary drum 32 and its angular position is shifted, the protrusion 30b of the drum receiver 30 is at one place, and the stopper 38 is Since the angular position locked to the protrusion 30b is a fixed position, the rotatable range of the rotary drum 32 does not change, and the adjustable range of the slat 14 does not change. Further, the winding drum 34 can be returned to the correct angular position by returning the position of the winding drum 34 with reference to the protrusion 30b of the drum receiver 30 by engaging the stopper 38 with the protrusion 30b of the drum receiver 30 again. it can.

It is a front view of the blind to which the raising / lowering rotation apparatus for blinds by this invention is applied. It is a perspective view of the raising / lowering rotation apparatus for blinds by this invention. It is a disassembled perspective view of the principal part of the raising / lowering rotation apparatus for blinds of FIG. It is a longitudinal cross-sectional view of the raising / lowering rotation apparatus for blinds of FIG. It is the top view which abbreviate | omitted a part of the raising / lowering rotation apparatus for blinds of FIG. FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 4, where (a) is during normal operation, (b) is when the rotating drum is further rotated at the lowest position, and (c) is from (b). When the rotating drum further rotates, (d) represents the time when the rotating drum further rotates and the stopper is locked to the drum receiver. 7 is a cross-sectional view taken along line 7-7 in FIG. 4, where (a) is during normal operation, (b) is when the rotating drum is further rotated at the lowest position, and (c) is from (b). When the rotating drum further rotates, (d) represents the time when the rotating drum further rotates and the stopper is locked to the drum receiver. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 4, (a) is during normal operation, (b) is when the rotating drum is further rotated at the lowest position, and (c) is from (b). When the rotating drum further rotates, (d) represents the time when the rotating drum further rotates and the stopper is locked to the drum receiver. It is a perspective view showing a differential shaft and a stopper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Head box 12 Ladder cord 14 Slat 18 Lift code 20 Blind lift / rotation device 22 Drive shaft 30 Drum receiver 30b Protrusion (locked portion)
32 Rotating drum 34 Winding drum 34c Projection 36 Differential shaft 38 Stopper

Claims (4)

A drum receiver (30) mounted in the head box (10), and a ladder cord (12) rotatably supported by the drum receiver (30) and supporting the slat (14) in an aligned state for rotation within a predetermined rotation range. ) To follow the tilting operation , and the rotating drum (32) that does not follow the ladder cord for further rotation and the lifting / lowering cord (18) are connected to one end of the lifting / lowering cord (18). A winding drum (34) for winding and unwinding (18), and the rotating drum (32) can rotate integrally with a drive shaft (22) that rotates in conjunction with an operation from the operation unit. In the lifting and rotating device for blinds,
Engagement / non-engagement is switched depending on the relative angular relationship with the rotating drum (32), and it can rotate relative to the rotating drum (32) in the disengaged state, and rotates integrally with the rotating drum (32) in the engaged state. Engagement / non-engagement is switched according to the relative angular relationship with the take-up drum (34), and it can rotate relative to the take-up drum (34) in the non-engaged state, and the winding in the engaged state. A differential shaft (36) that can rotate integrally with the take-up drum (34) is provided, and the differential shaft (36) is disposed in the take-up drum (34), so that the rotation of the rotary drum (32) is different. A blind lifting and rotating device characterized in that it can be transmitted to the take-up drum (34) via the moving shaft (36).   The differential shaft (36) is further provided with a stopper storage portion (36c) for storing a stopper (38) that can protrude in the outer circumferential direction of the differential shaft (36), and the winding drum (34). Is provided with a protrusion (34c) that can press the stopper (38) in the protruding direction, and the drum receiver (30) has a locked portion (30b) that can be locked with the protruding stopper (38). The protrusion (34c) presses the stopper (38) by relative rotation between the differential shaft (36) and the take-up drum (34), and the stopper (38) is brought into contact with the locked portion (30b). 2. The blind lifting and rotating device according to claim 1, wherein when it is locked, further rotation of the differential shaft (36) and the rotating drum (32) is restricted.   After the protrusion (34c) presses the stopper (38), the winding drum (34) rotates together with the differential shaft (36) until the stopper (38) is locked to the locked portion (30b). The lifting / lowering rotary device for a blind according to claim 2, wherein the lifting / lowering cord (18) is unwound.   The blind lifting and rotating device according to claim 3, wherein the locked portion (30b) is provided only in one place in the circumferential direction of the drum receiver (30).

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