JP2020037979A - Gear change gear device and shield device having gear change gear device - Google Patents

Abstract

To provide a gear change gear device capable of reducing the number of parts, and a shield device having the gear change gear device.SOLUTION: A gear change gear device 20 that transmits the force input from an operation unit to the winding shaft that moves the slat, comprises: an input member 23 rotated by input from the operation unit and having an eccentric shaft part 23c at a position eccentric to the rotation center; a spur gear member 24 with the eccentric shaft part 23c inserted into its center hole 24a, and the external teeth 24b rotate and revolve while meshing with the internal teeth 21b provided on the case 21 of the gear change gear device 20, and having a pair of transfer projections 24c; and an output member 25 comprising a cross-shaped engaging groove 25b to which the transfer projection 24c is engaged, and rotated by a transfer projection 24c moving in the engagement groove 25b.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a transmission gear mechanism that changes the speed of an input rotation and outputs the rotation, and a shielding device including a transmission gear mechanism that moves a shielding member via the transmission gear mechanism.

  2. Description of the Related Art Conventionally, as one type of a shielding device, there is a horizontal blind in which a slat can be raised and lowered by rotating a winding shaft by operating an operation code (see Patent Document 1). This type of horizontal blind includes a pulley in which an operation code is hung on one end of a head box, a speed change gear mechanism connected to the pulley, and a drive shaft that rotates a winding shaft that winds up and down the slats. It has. The transmission gear mechanism is a gear box, and reduces the speed of rotation of a pulley rotated by an operation code and transmits the rotation to a drive shaft. For example, in Patent Literature 1, the transmission gear mechanism includes a sun gear, a planetary gear, a carrier that supports the planetary gear so that it can rotate and revolve, an inner gear that meshes with the planetary gear, and the like.

Japanese Patent No. 6151556

By the way, in the shielding device, it is desired to reduce the number of components of the head box, and accordingly, it is required to reduce the number of components of the transmission gear mechanism.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a transmission gear mechanism that can reduce the number of parts and a shielding device provided with the transmission gear mechanism.

  A speed change gear mechanism for solving the above-mentioned problem is a speed change gear mechanism that changes the speed of input rotation and outputs the speed, and includes a first member having internal teeth and a second member that rotates about a first rotation shaft. A second member having an eccentric portion eccentric with respect to the first rotation shaft, and a third member rotating with the eccentric portion as a second rotation shaft, meshing with the internal teeth. The third member including external teeth and a transmission unit provided at a position eccentric to the second rotation axis; and an engagement unit engaged with the transmission unit. A fourth member that moves an engaging portion, and any one of the first member, the second member, and the fourth member is an input member, and the remaining members are an output member and a fixed member. is there.

In the above-described transmission gear mechanism, the third member may include a pair of the transmission units with the second rotation shaft interposed therebetween.
In the above-mentioned speed change gear mechanism, the engagement portion may be constituted by two grooves that intersect at the center of the fourth member.

  In the above-described transmission gear mechanism, the transmission gear mechanism is, for example, the second member is an input member connected to an operation unit, the fourth member is an output member connected to a drive shaft, The member is a fixing member. In this case, as an example, the transmission gear mechanism reduces the rotation of the first rotation speed input to the second member to the rotation of the second rotation speed lower than the first rotation speed from the fourth member. A reduction mechanism may be used.

A shielding device for solving the above problem, an input unit for inputting a force for moving the shielding material,
A moving unit that moves the shielding member; and a transmission gear mechanism that connects the input unit and the moving unit, wherein the transmission gear mechanism has a first member having internal teeth and a first rotation shaft. A second member having an eccentric portion eccentric with respect to the first rotation axis, and a third member rotating with the eccentric portion as a second rotation axis, The third member including an external tooth that meshes with the internal teeth, and a transmission unit provided at a position eccentric to the second rotation axis; and an engagement unit that is engaged with the transmission unit. The transmission unit includes a fourth member that moves the engagement unit, and any one of the first member, the second member, and the fourth member is an input member, and the remaining members are output members. A member and a fixing member.

  According to the present invention, the number of parts can be reduced.

(A) is a front view of a horizontal blind to which the present invention is applied, and (b) is a cross-sectional view of a head box. FIG. 3 is a side view of the transmission gear mechanism. FIG. 3 is an exploded perspective view of a transmission gear mechanism. FIG. 4 is an exploded perspective view of the transmission gear mechanism viewed from a direction opposite to FIG. 3. (A)-(i) is a schematic diagram which shows operation | movement of a transmission gear mechanism in order of every 45 degrees.

Hereinafter, a horizontal blind to which the present invention is applied will be described with reference to the drawings.
As shown in FIGS. 1A and 1B, a horizontal blind as a shielding device has a plurality of slats 3 as a shielding material suspended through a plurality of ladder cords 2 hanging from a head box 1. The bottom rail 4 is suspended and supported at the lower end of the ladder cord 2.

  At a position adjacent to the ladder code 2, a plurality of elevating cords 5 as hanging members are suspended from the head box 1. The central elevating cord 5 is hung down on the near side of the slat 3 (inside the room), and the elevating cords 5 on both ends are hung down on the back side of the slat 3 (outside the room). The elevating cord 5 has an upper end disposed in the head box 1 and wound around a winding shaft 6 serving as a moving part for moving the slat 3 in the elevating direction, and a lower end connected to the bottom rail 4.

  The elevating cord 5 is wound or unwound based on the rotation of the winding shaft 6, and the bottom rail 4 and the slat 3 are raised and lowered based on this rotation. The angles of the slats 3 are adjusted in phase with the ladder cord 2 based on the rotation of the winding shaft 6. When the slats 3 are pivoted to the vertical direction and become fully closed, they are not further rotated. The winding shaft 6 is rotatably supported by a support member 7, and the support member 7 is detachably fixed to the head box 1.

  An operation unit 8 is provided at a position closer to the center in the width direction than the right end of the head box 1. The operation unit 8 rotates the second shaft 11 housed inside the head box 1 based on the operation of the loop-shaped operation code 9 derived from the opening of the cap 10 closing the opening of the head box 1. The winding shaft 6 can be driven, and the winding shaft 6 is rotated based on the rotation of the second shaft 11.

  At both ends in the longitudinal direction of the head box 1, there are provided cord insertion holes 12 for leading operation codes 9 to the front side of the head box 1, respectively. 1A and 1B, the operation code 9 is derived from the code insertion hole 12 on the right side in the figure.

  The operation unit 8 as an operation unit includes an operation pulley 13. The operation code 9 is multiplied on the operation pulley 13. The operation pulley 13 has a first shaft 13 a extending in the same direction as the longitudinal direction of the head box 1. When the operation cord 9 is operated to rotate the operation pulley 13, the rotation is driven through the first shaft 13 a by a driving force. The power is transmitted to the transmission gear mechanism 20 as a transmission unit. That is, the speed change gear mechanism 20 receives the rotation of the first rotation speed from the first shaft 13a as the input shaft from the operation pulley 13 and the rotation speed of the second rotation shaft 11 that is lower than the first rotation speed with respect to the second shaft 11 as the output shaft. Outputs rotation at two rotation speeds. The transmission gear mechanism 20 here is a reduction mechanism that reduces the rotation of the rotating shaft.

  As shown in FIG. 2, the transmission gear mechanism 20 specifically includes a case 21 as a first member accommodating a plurality of gears, and a lid member 22 for closing an opening on one surface of the case 21. I have. As shown in FIGS. 3 and 4, the case 21 is a fixing member fixed to another member. The case 21 has an input member 23 as a second member and a flat member as a third member. A gear member 24 and an output member 25 as a fourth member are provided.

  The input member 23 is a movable member with respect to the case 21 which is a fixed member to which the rotation of the first shaft 13a is input. The input member 23 includes a pedestal portion 23a, an input shaft portion 23b to which the first shaft 13a of the operation pulley 13 provided on one surface of the pedestal portion 23a is connected, and an input shaft portion 23b on the other surface of the pedestal portion 23a. An eccentric shaft portion 23c as an eccentric portion eccentric to the first rotation shaft is provided. The input shaft portion 23b has a connection hole 23d into which the first shaft 13a is fitted. The connection hole 23d is a non-circular hole, into which the first shaft 13a having the same cross-sectional shape is fitted. Thus, the input member 23 rotates with the first shaft 13a as the first rotation axis. The connection structure between the input shaft 23b and the first shaft 13a is not particularly limited as long as the input shaft 23b and the first shaft 13a rotate integrally.

  The input shaft portion 23b is exposed in the first direction, which is the direction of the operation pulley 13, from the input hole 22a of the lid member 22 that closes the opening on one surface of the case 21. The outer peripheral portion of the pedestal portion 23a is a surface on the case 21 side of the lid member 22 and overlaps with the outer peripheral portion of the input hole 22a to prevent the lid member 22 from coming off. The eccentric shaft portion 23c is a projection protruding in the second direction opposite to the input shaft portion 23b, and is eccentric with respect to the first rotation shaft. Then, the spur gear member 24 is connected to the spur gear member 24 and serves as a second rotation axis.

  The spur gear member 24 includes a center hole 24a at the center of the transmission wheel and external teeth 24b at an outer peripheral portion. The center hole 24a is a through hole, into which the eccentric shaft 23c is inserted. The eccentric shaft part 23c is rotatable in the center hole 24a. Further, the spur gear member 24 includes a transmission protrusion 24c as a transmission portion on a surface opposite to the input member 23. A pair of transmission projections 24c projecting in the second direction are provided on the surface of the spur gear member 24 at eccentric positions with the center hole 24a interposed therebetween. The transmission protrusion 24c is connected to the output member 25.

  The case 21 is a fixing member that is an internal gear member and is fixed to other peripheral members. The case 21 has a space 21a for accommodating the spur gear member 24 and the like. The peripheral wall of the space 21a is provided with internal teeth 21b. The external teeth 24b of the spur gear member 24 mesh with the internal teeth 21b. The spur gear member 24 revolves along the peripheral wall while rotating around the eccentric shaft portion 23c in the space 21a. Further, an output hole 21c for exposing the output shaft portion 25c of the output member 25 is provided at the center of the bottom surface of the space 21a.

  The output member 25 is a movable member that outputs rotation to the second shaft 11 serving as a drive shaft that rotationally drives the winding shaft 6 with respect to the case 21 that is a fixed member. The output member 25 includes a pedestal portion 25a, an engagement groove 25b as an engagement portion in which a pair of transmission protrusions 24c are engaged with one surface of the pedestal portion 25a, and a second surface on the bottom surface side of the case 21. And an output shaft portion 25c. The pedestal portion 25a has substantially the same size as the space portion 21a, and rotates in the space portion 21a. The engagement groove 25b is provided so that two grooves intersect at the position of the first rotation axis, and has a cross shape. The distance from the intersection of the two grooves to each end is substantially equal to the distance between the pair of transmission projections 24c. The output shaft portion 25c is exposed from the output hole 21c, and rotates integrally with the second shaft 11 in a state where the rotation center is aligned. The connection structure between the output shaft 25c and the second shaft 11 is not particularly limited as long as the output shaft 25c and the second shaft 11 rotate integrally.

  The output member 25 is rotated as the transmission protrusion 24c moves along the engagement groove 25b. The center of rotation of the output shaft portion 25 c matches the center of rotation of the input shaft portion 23 b of the input member 23. The output member 25 is rotated in the same direction as the input member 23 at a second rotation speed lower than the first rotation speed of the input member 23.

  The output member 25 is disposed in the space 21a of the case 21 such that the output shaft portion 25c is inserted into the output hole 21c, and then the transmission projection 24c is engaged with the engagement groove 25b to thereby form the spur gear member 24. Then, the eccentric shaft portion 23c is inserted into the center hole 24a to arrange the input member 23. Thereafter, the lid member 22 is arranged in the case 21 so as to close the opening while exposing the input shaft portion 23b from the input hole 22a. Then, the case 21 and the cover member 22 are fixed by being screwed into the insertion hole 22x of the cover member 22 and screwed into the screw hole 21x formed in the flange of the case 21. Note that the screw hole 21x may be inserted and a nut may be fastened to the screw 20x.

Next, the operation of the horizontal blind configured as described above will be described.
When lowering the bottom rail 4, an operation of lowering one operation code 9 is performed. Then, the operation pulley 13 rotates in one direction, and the input member 23 rotates in one direction through the first shaft 13a (the directions of arrows in FIGS. 5A to 5I). Then, the spur gear member 24 connected to the input member 23 through the eccentric shaft portion 23c rotates and revolves. Then, the output member 25 connected to the spur gear member 24 through the transmission protrusion 24c is also rotated in one direction. Specifically, the transmission protrusion 24c moves so as to slide in the cross-shaped engagement groove 25b. Thus, the second shaft 11 connected to the output member 25 is rotated at a reduced speed with respect to the rotation speed of the first shaft 13a. The lifting cord 5 is unwound from the winding shaft 6. Thereby, the bottom rail 4 is lowered from the uppermost position to the lowermost position. 5A to 5I show the positions of the eccentric shaft portion 23c and the transmission protrusion 24c in order. FIG. 5A shows a state at 0 ° where the eccentric shaft portion 23c is a reference, and FIG. 5I shows that the eccentric shaft portion 23c moves from the state of FIG. It shows a state where it is rotated 360 °.

  When raising the bottom rail 4 from the lowermost position, an operation of lowering the other operation code 9 is performed. Then, the operation pulley 13 rotates in the other direction, and the input member 23 is rotated in the other direction through the first shaft 13a (the direction opposite to the arrow in FIGS. 5A to 5I). Then, the spur gear member 24 rotates and revolves, and the output member 25 is also rotated in the other direction. Thus, the second shaft 11 connected to the output member 25 is rotated at a reduced speed with respect to the rotation speed of the first shaft 13a. The lifting cord 5 is wound around the winding shaft 6.

The transmission gear mechanism 20 having the above configuration can set the reduction ratio as follows.
Assuming that the number of internal teeth 21b of the case 21 is Za and the number of external teeth 24b of the spur gear member 24 is Zb,
The angle when the input member 23 advances the inner teeth 21b by one sheet is 360 / Za (A)
The angle of one external tooth 24b of the spur gear member 24 is 360 / Zb (B)
The angle at which the output member 25 advances when the input member 23 advances by one inner tooth 21b is
(A)-((B) / 2) ... (C)
Therefore, the reduction ratio is 1 / ((A) / (C))
Becomes

For example, when the number of the internal teeth 21b of the case 21 is 40 and the number of the external teeth 24b of the spur gear member 24 is 25, the reduction ratio is as follows.
(A) = 360/40 = 9
(B) = 360/25 = 14.4
(C) = 9− (14.4 / 2) = 1.8
Reduction ratio = 1 / (9 / 1.8) = 1/5
The horizontal blind as described above can obtain the effects listed below.

  (1) In forming the reduction gear mechanism, the transmission gear mechanism 20 only needs to provide the input member 23, the spur gear member 24, and the output member 25 with respect to the case 21, and the number of parts can be reduced.

(2) The connection between the spur gear member 24 and the output member 25 can be realized by a simple structure in which the transmission projection 24c of the spur gear member 24 is engaged with the engagement groove 25b of the output member 25.
In addition, the horizontal blind can be further modified and implemented as described below, for example.

The transmission gear mechanism 20 may be configured as a speed increasing gear unit by adjusting the number of internal teeth 21 b of the case 21 and the number of external teeth 24 b of the spur gear member 24.
The transmission gear mechanism 20 can be used as a speed increasing gear unit by setting the output member 25 to the input side and the input member 23 to the output side. In this case, the output member 25 becomes an input member, and the output shaft 25c becomes an input shaft. The input member 23 is an output member, and the input shaft 23b is an output shaft.

  The output shaft 25c may be fixed using the output member 25 as a fixing member. In this case, when the case 21 is an input member serving as a movable member, reverse rotation can be output from the input shaft portion 23b of the input member 23 serving as an output member.

-Case 21 may be constituted as a part of other members.
-The number of transmission projections 24c of the spur gear member 24 may be one. In this case, the engagement groove 25b of the output member 25 may be constituted by one groove. Thereby, the configurations of the spur gear member 24 and the output member 25 can be simplified.

The same effect can be achieved by providing a rotating shaft on the spur gear member 24 and engaging the rotating shaft with a concave portion provided at the position of the eccentric shaft portion 23c.
-The input shaft part 23b and the output shaft part 25c do not need to have a protruding shape. For example, the input shaft portion 23b is configured as a concave portion with respect to the pedestal portion 23a, and does not need to protrude from the cover member 22 as long as it faces outward from the input hole 22a. The output shaft portion 25c is formed as a recess with respect to the pedestal portion 25a, and does not need to protrude from the bottom surface of the case 21 as long as it faces outward from the output hole 21c.

-The shielding device is not limited to the horizontal blind. For example, a roll screen or a pleated screen may be used.
The transmission gear mechanism 20 can be disposed between the input shaft and the output shaft other than the shielding device.

  DESCRIPTION OF SYMBOLS 1 ... Head box, 2 ... Rudder code, 3 ... Slat, 4 ... Bottom rail, 5 ... Elevating cord, 6 ... Winding shaft, 7 ... Support member, 8 ... Operation unit, 9 ... Operation code, 10 ... Cap, 11 ... Second shaft, 12 ... Cord insertion hole, 13 ... Operation pulley, 13a ... First shaft, 20 ... Transmission gear mechanism, 21 ... Case, 21a ... Space, 21b ... Inner teeth, 21c ... Output hole, 22 ... Lid Member, 22a input hole, 23 input member, 23a pedestal portion, 23b input shaft portion, 23c eccentric shaft portion, 23d connection hole, 24 spur gear member, 24a central hole, 24b external teeth, Reference numeral 24c: a transmission projection; 25, an output member; 25a, a pedestal portion; 25b, an engagement groove;

Claims (6)

A transmission gear mechanism that changes the input rotation and outputs the rotation,
A first member having internal teeth,
A second member that rotates about a first rotation axis, the second member including an eccentric portion that is eccentric with respect to the first rotation axis;
A third member that rotates about the eccentric portion as a second rotation axis, the third member including external teeth meshing with the internal teeth, and a transmission portion provided at a position eccentric with respect to the second rotation axis. A third member,
A fourth member that includes an engagement portion that is engaged with the transmission portion, and the transmission portion moves the engagement portion.
A transmission gear mechanism, wherein one of the first member, the second member, and the fourth member is an input member, and the remaining members are an output member and a fixed member. The transmission gear mechanism according to claim 1, wherein in the third member, a pair of the transmission units are provided with the second rotation shaft interposed therebetween. The transmission gear mechanism according to claim 2, wherein the engagement portion includes two grooves that intersect at a center of the fourth member. The second member is an input member connected to an operation unit,
The fourth member is an output member connected to a drive shaft,
The transmission gear mechanism according to claim 1, wherein the first member is a fixed member. The speed change gear mechanism is a reduction mechanism that reduces the rotation of the first rotation speed input to the second member from the fourth member to a rotation of a second rotation speed lower than the first rotation speed. 5. The transmission gear mechanism according to claim 4. An input unit for inputting a force for moving the shielding material,
A moving unit that moves the shielding material,
A transmission gear mechanism that connects the input unit and the moving unit,
The transmission gear mechanism,
A first member having internal teeth,
A second member that rotates about a first rotation axis, the second member including an eccentric portion that is eccentric with respect to the first rotation axis;
A third member that rotates about the eccentric portion as a second rotation axis, the third member including external teeth meshing with the internal teeth, and a transmission portion provided at a position eccentric with respect to the second rotation axis. A third member,
A fourth member that includes an engagement portion that is engaged with the transmission portion, and the transmission portion moves the engagement portion.
Any one of the first member, the second member, and the fourth member is an input member, and the remaining members are an output member and a fixed member.

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