JPH0342395B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to electric blinds, and more particularly to a blind positioning device for positioning the slats of a blind at a predetermined position, such as a winding stop position or a rewinding stop position.

[Background technology]

Generally, in electric blinds, the slats are raised and lowered by a motor, so the stopping position of the slats when they are raised and lowered is detected, and when the slats reach that stop position, the motor is stopped and the slats are raised and lowered. must be positioned in place. In particular, when electric blinds are installed on a window frame, if the lower end of the slat (bottom rail) is not approximately aligned with the lower frame of the window frame when lowering, for example, the bottom rail will ride on the lower frame and touch the slat. If the slats are sagging, it will cause the slats to swing due to the air being blown for heating and cooling.

Conventionally, an electric blind positioning device has a feed screw shaft rotated by a motor that winds up and down a slat lifting string, and a nut member that is threaded onto the feed screw shaft and linearly moved along a predetermined guide. and a limit switch operated by this nut member, so that when the limit switch is operated by the nut member that moves along the feed screw shaft as the motor rotates, the rotation of the motor is stopped by this limit switch. I was getting used to it.

By the way, the amount of winding in one revolution of a general electric blind is about 9 cm, and it takes more than 40 revolutions to roll up a blind up to 4 m long. Therefore, in conventional positioning devices, in order to operate the limit switch by rotating over 40 revolutions, a fairly long feed screw shaft is required, resulting in an increase in the size and price of the device, and The disadvantage is that the operating accuracy of the limit switch is poor due to backlash between the screw shaft and the nut member.

In addition, to adjust the raising and lowering stop positions of the slats, move the limit switch in the axial direction of the feed screw shaft with the motor stopped, then drive the motor and check the stop position of the bottom rail. This has the disadvantage that adjustment is troublesome and time-consuming because the adjustment process must be repeated.

On the other hand, a positioning device using a worm gear instead of the feed screw shaft can be considered, but even a device using a worm gear has almost the same drawbacks as mentioned above, and in any case, there are major practical problems. .

[Purpose of the invention]

Here, an object of the present invention is to provide a compact, low-cost,
Moreover, it is an object of the present invention to provide an electric blind positioning device which can be attached to any position on the winding shaft and which can easily and accurately position the slat at a predetermined position.

[Structure of the invention]

Therefore, in the configuration of the present invention, a lifting cord for raising and lowering the slat is wound around a winding shaft driven by a motor, and the electric blind positioning system positions the slat at a predetermined position based on the amount of rotation of the winding shaft. The device includes a body, a rotating shaft rotatably supported by the body, having a through hole through which the winding shaft can be inserted while being engaged with the winding shaft along the central axis direction, and rotating together with the winding shaft. , a rotary body that is rotatably provided on the body and has an operating part, and an adjustment gear that is normally held unrotatable with respect to the body, and decelerates the rotation of the rotary shaft and transmits it to the rotary body. a differential gear mechanism that rotates an adjustment gear of the differential gear mechanism to adjust an initial relative angular position of the rotating body with respect to the rotating shaft of the operating section; An actuating lever that has a roller and is displaced by an actuating section of a rotating body; and an actuating lever that urges the roller toward the rotating body through this actuating lever, and when the actuating lever is displaced by the actuating section, the motor is activated. It is characterized by being equipped with a detector that stops the drive.

〔Example〕

FIG. 1 shows the front of the electric blind of this embodiment. In the figure, a winding shaft 2 is rotatably supported inside a rectangular cylindrical head box 1 along its longitudinal direction. On the winding shaft 2,
A motor 3 is connected to one end thereof, and
Drums 4 are provided at positions slightly inward from both ends. Wound around each drum 4 is a lifting cord 7 whose other end is connected to a bottom rail 6 through a number of slats 5 arranged parallel to each other below the head box 1. As a result, when the motor 3 is driven to rotate forward, for example, by operating the push button switch 8, the lifting string 7 is unwound from the drum 4 by the forward rotation of the winding shaft 2, and the slat 5
While being lowered, when the motor 3 is driven to rotate in reverse, the lifting string 7 is attached to the drum 4 due to the reverse rotation of the winding shaft 2.
is wound up and the slat 5 is raised.

Furthermore, limit switches 9 are provided on both ends of the lower surface of the head box 1, which are operated by the bottom rail 6 when the slat 5 is raised. Furthermore, a position detection device 10 is provided midway along the winding shaft 2 for detecting the lowering stop position of the slat 5 from the amount of rotation of the winding shaft 2. As a result, when the limit switch 9 is activated, the reverse rotation drive of the motor 3 is stopped, and
When the position detection device 10 detects the lowering stop position, the forward rotation of the motor 3 is stopped.

2, 3 and 4 show the position detection device 10. FIG. In these figures, the body 11 includes two body frames 11 that are fitted into each other.
A and 11B form a box-like structure with a cavity 12 inside. A through hole 13 is formed approximately at the center of each body frame 11A, 11B, and a hub portion 14 is formed inside each through hole 13, respectively. A rotating shaft 15 is provided between both the through holes 13.
is rotatably supported. The rotating shaft 15 has
A hexagonal hole 16 serving as a through hole into which the winding shaft 2 fits is formed in the center thereof, and an eccentric cam 17 is integrally formed approximately at the center of the outer circumference in the longitudinal direction. A two-stage external gear 18 is rotatably attached to the eccentric cam 17.

One large diameter gear 19 of the two-stage external gear 18
A first internal gear 21 serving as an adjustment gear rotatably supported on the outer periphery of one end of the rotating shaft 15 is internally meshed with the first internal gear 21 . A gear 22 is integrally formed on the outer end side of the outer peripheral surface of the first internal gear 21, and an adjustment means 23 is meshed with this gear 22. The adjusting means 23 includes an adjusting shaft 24 which is fixed to the body frame 11A of the body 11 and rotatably supported with a certain resistance by, for example, a flat washer and a spring washer, and an adjusting shaft 24 at the tip of the adjusting shaft 24. A worm 25 is provided and meshed with the gear 22. The base end of the adjustment shaft 24 is formed into a box shape with a hexagonal hole 26 inside, and faces a recess 28 of a bulge 27 that bulges out from the lower surface of the body frame 11A. As a result, when a suitable hexagonal wrench is inserted into the hexagonal hole 26 and the adjustment shaft 24 is rotated, the first internal gear 21 rotates around the hub portion 14 due to the action of the gear 22 meshed with the worm 25. On the other hand,
The worm 25 rotates from the first internal gear 21 side.
Due to the relationship between the lead angle and the rotational resistance of the adjustment shaft 24, it is not transmitted to the adjustment shaft 24. Therefore, unless the adjustment shaft 24 is rotated, the first internal gear 2
1 is fixed to the body 11 at a predetermined position.

Further, a second internal gear 31 rotatably supported on the outer periphery of the other end of the rotating shaft 15 is internally meshed with the other smaller diameter gear 20 of the two-stage external gear 18 . Here, the external toothed two-stage gear 1
8. First internal gear 21 and second internal gear 3
1 constitutes a differential gear mechanism 30.
On the outer periphery of the second internal gear 31, a cam 32 is provided as a rotating body having an operating portion 32A made of a protrusion.
are integrally formed. On the other hand, the body 11
The body frame 11A includes an operating lever 33 whose other end faces the cam 32 of the second internal gear 31.
A substantially central portion thereof is provided so as to be displaceable via a pin 35. The actuating lever 33 has a roller 36 at its other end that rolls along the cam 32 of the second internal gear 31, and has one end protruding outside the body 11. Here, the radius of the roller 36 is set to be slightly larger than the height from the valley of the cam 32 to the operating portion 32A, and the pin 3
5 and the center of the roller 36 substantially coincides with a tangent from the actuating portion 32A of the cam 32 that the roller 36 contacts.

Further, a limit switch 34 serving as a detector is attached to the outside of the body 11 facing one end of the operating lever 33. The limit switch 34 is connected to the body frames 11A and 11 of the body 11.
Mounting pins 3 protruding parallel to each other on the outside of B
7, 38 and is fixed. As a result, as the second internal gear 31 rotates, the operating portion 32A of the cam 32 displaces the operating lever 33 about the pin 35, and the limit switch 34 is turned on or off. Then, the drive of the motor 3 is stopped.

Next, the operation of this embodiment will be explained. First, when the motor 3 is driven to rotate forward by operating the push button switch 8, as the winding shaft 2 is rotated forward, the lifting string 7 is unwound from the drum 4 in accordance with the amount of rotation of the winding shaft 2. The slat 5 is being lowered.

On the other hand, as the winding shaft 2 rotates forward, the rotating shaft 15 is rotated through the hexagonal hole 16. Then, the external toothed two-stage gear 18 attached to the eccentric cam 17 of the rotating shaft 15 also tries to rotate, but this external toothed two-stage gear 1
One of the gears 19 of 8 is meshed with the first internal gear 21 which is in a fixed state due to the action of the adjusting means 23, so that it rolls on the internal teeth of the first internal gear 21. However, the speed is reduced by the ratio of the number of teeth. At the same time, as the one gear 19 rotates, the other gear 20 also rotates, so the second internal gear 31 meshed with the other gear 20 is further decelerated by the ratio of the number of teeth. It will rotate on the rotating shaft 15. In this way, the rotation of the second internal gear 31 causes the operating portion 32A of the cam 32 provided on the circumferential surface of the second internal gear 31 to
are moved sequentially. At this time, since the spring force in the limit switch 34 acts in the direction of pressing the roller 36 against the circumferential surface of the cam 32 via the operating lever 33, there is no play in the direction of rotation opposite to the rotation direction of the cam 32. In other words, the differential gear mechanism 30 and the like are maintained in a state where there is no backlash.

Eventually, the actuating portion 32A of the cam 32 moves to the roller 36.
When reaching this point, the edge of the actuating portion 32A causes the actuating lever 33 to be rapidly rotated about the pin 35 via the roller 36, and as a result, the limit switch 34 is actuated. As a result, the forward rotation drive of the motor 3 is automatically stopped.

At this time, make sure that the lowering stop position of the bottom rail 6 is at the correct position, for example, at the lowest edge of the window frame.
Adjust the position of the first internal gear 21. To do this, insert a suitable hexagonal wrench into the hexagonal hole 26 of the adjustment shaft 24 of the adjustment means 23 and rotate the adjustment shaft 24. As the adjustment shaft 24 rotates, the worm 2
5 and the gear 22, the first internal gear 21 can be rotated. When the first internal gear 21 rotates, one gear 19 and the other gear 2
0, the second internal gear 31 rotates, and the rotation of the second internal gear 31 changes the initial position of the operating portion 32A of the cam 32. Limit switch 3 by 32A
4 is activated, that is, the number of revolutions of the take-up shaft 2 changes.
The lowering stop position can be adjusted.

For example, when the cam 32 rotates counterclockwise in FIG. 2 and the edge of its operating portion 32A operates the limit switch 34 via the operating lever 33, the bottom rail 6 moves below the window frame. Assume that it stops slightly above the frame. In this case,
After the first internal gear 21 is rotated in the direction in which the cam 32 is rotated clockwise in FIG. 2, when the motor 3 is driven to rotate forward again, the cam 32 is rotated counterclockwise in FIG. The edge of the actuating portion 32A operates the limit switch 3 via the actuating lever 33.
4 is activated again, the forward rotation drive of the motor 3 is stopped. Therefore, in this way, the lowering stop position of the bottom rail 6 can be adjusted to match the lower frame of the window frame. At this time, when the cam 32 is rotated clockwise in FIG. 2 for adjustment, that is, when the cam 32 is rotated in the opposite direction to the direction of rotation by the motor 3, there is no play in that direction. Since it is kept in a state where there is no space, it is possible to adjust the position extremely finely and accurately.

On the other hand, when the motor 3 is driven to rotate in reverse by operating the push button switch 8, as the winding shaft 2 is rotated in the reverse direction, the lifting cord 7 is wound around the drum 4 in accordance with the amount of rotation of the winding shaft 2, and the slat is 5 is being raised. Eventually, when the bottom rail 6 reaches the upper limit position, the limit switch 9 is actuated by the bottom rail 6, and the reverse rotation drive of the motor 3 is automatically stopped. As a result, the slat 5 is automatically stopped at the upper limit position of winding.

Therefore, according to this embodiment, since the differential gear mechanism 30 is used instead of using a long member such as the feed screw shaft in the conventional example, a large reduction ratio can be obtained, and the external dimensions of the device, especially The axial dimension can be significantly shortened, and the device can be made more compact. Moreover, the parts that make up the device do not require expensive parts such as the feed screw shaft, and can be manufactured at low cost because they can be made from simple parts such as gears, and the number of parts can be reduced. It can also be done inexpensively. Moreover, since it is constructed from a simple combination of gears, highly accurate parts can be easily obtained, and the accuracy of the entire device can be improved.

Further, the differential gear mechanism 30 is normally connected to the body 11.
Since the first internal gear 21 is fixed to the bottom rail 6, the first internal gear 21 is rotated by the adjusting means 23 while the motor 3 is being driven. The stop position can be adjusted. Therefore, adjustment can be performed easily and efficiently, and the bottom rail 6 can be accurately positioned at a predetermined position.

In particular, in this embodiment, the other end of the actuating lever 33 is provided with a roller 36 that makes sliding contact with the cam 32, and one end is brought into contact with the limit switch 34, so that the spring force within the limit switch 34 causes the cam 32 to rotate in the forward and reverse directions. Positioning errors due to backlash of the differential gear mechanism 30 can be reduced. Moreover, the radius of the roller 36 is
2A, and the center of the roller 36 and the rotation fulcrum of the operating lever 33, that is, the pin 35.
Since the straight line connecting the center of the cam 32 is made substantially coincident with the tangent from the actuating portion 32A of the cam 32, the actuating lever 33 is A large amount of displacement can be taken, and from this point of view as well, positioning during forward and reverse rotation can be performed finely and accurately without causing errors.

In addition, since the hexagonal hole 16 with which the winding shaft 2 engages is formed in the central axis direction of the rotating shaft 15, the body 1
1 can be attached to any position on the winding shaft 2. Therefore, if the body 11 is attached to a position where it does not protrude from both ends of the winding shaft 2, a plurality of electric blinds can be arranged in close proximity.

Further, the adjusting means 23 that determines the timing at which the limit switch 34 is actuated is controlled by a worm 25.
Since the adjustment shaft 24 is composed of the gear 22 and the adjustment shaft 24, there is no problem even if the adjustment shaft 24 is turned endlessly. Not at all.
Moreover, since there is no need to move the limit switch 34 when setting the operation timing of the limit switch 34, the terminals of the limit switch 34 can be fixed to the base of the control drive circuit (not shown), and therefore the micro switch can be moved as in the conventional case. Wiring by lead wires in such cases can be eliminated, and work efficiency can be improved, and occurrences of conduction defects and the like can be prevented.

In addition, the body 11 can be divided into two body frames 11.
A, 11B, both body frames 11
Two mounting pins 3 protruding from the outside of A and 11B
Since the limit switch 34 is inserted into the holes 7 and 38, it is not only easy to install the limit switch 34, but also has the advantage that the two body frames 11A and 11B can be integrated by installing the limit switch 34.

In addition, in implementation, as a differential gear mechanism,
The structure is not limited to the structure described in the above embodiments, but any structure that can obtain a high reduction ratio using gears may be used. For example, the differential gear mechanism 13 shown in FIGS. 5 and 6
0, an eccentric arm 117 is integrally formed approximately in the longitudinal center of the outer circumference of the rotating shaft 15, and a two-stage external gear 118 is rotatably attached to the eccentric arm 117. A first gear 121 rotatably supported on the outer periphery of one end of the rotary shaft 15 is meshed with one gear 119 of the rotary shaft 15, and the other small-diameter gear 120 of the two-stage external gear 118 is engaged with the rotary shaft 15. A second gear 131 rotatably supported on the outer periphery of the other end of the gear 15 is meshed with the second gear 131 . The adjusting means 23 is meshed with the outer periphery of the outer end of the first gear 121 . Further, at the outer end of the second gear 131, there is provided an actuating portion 1 for actuating the limit switch 34 via the actuating lever 33.
A cam 132 having a diameter of 32A is formed. Therefore, in this embodiment, since the first and second gears 121 and 131 that mesh with the two-stage external gear 118 may be external gears, they are less expensive than the internal gears described in FIGS. 2 to 4. It has the advantage of being inexpensive to manufacture.

In the differential gear mechanism 230 shown in FIGS. 7 and 8, a support shaft 217 is integrally formed at right angles to the rotation shaft 15 at approximately the center of the outer circumference of the rotation shaft 15 in the longitudinal direction. A bevel gear 218 is rotatably mounted, and this planetary bevel gear 218
, one bevel gear 2 of the double-sided bevel gear 219 rotatably supported on the outer periphery of one end of the rotating shaft 15.
20 and a bevel gear 231 rotatably supported on the outer periphery of the other end of the rotating shaft 15 are meshed with each other. The bevel gear 25A of the adjusting means 23 is meshed with the other bevel gear 221 of the double-sided bevel gear 219. Further, a cam 232 having an operating portion 232A for operating the limit switch 34 via the operating lever 33 is formed on the outer periphery of the outer end of the bevel gear 231. Therefore, in this example, only the bevel gear needs to be machined.
Similar to the embodiments shown in FIGS. 5 and 6, this embodiment has the advantage that it can be manufactured at low cost.

Further, in the differential gear mechanism 330 shown in FIGS. 9 and 10, a gear 317 is integrally formed approximately at the center of the outer circumference of the rotating shaft 15 in the longitudinal direction, and
An internal gear 321 is rotatably supported on the outer periphery of one end of the rotating shaft 15, and a cam plate 331 having an operating portion 332 is rotatably supported on the outer periphery of the other end of the rotating shaft 15. A bevel gear 322 is formed on the outer periphery of the outer end surface of the internal gear 321, and the bevel gear 25A of the adjusting means 23 is meshed with the bevel teeth 322. Further, three equal angle positions on the inner surface of the cam plate 331 are provided.
Support pins 318 are provided in a protruding manner, and planetary gears 319 are rotatably supported by each of the support pins 318, and the planetary gears 319 are externally meshed with the gear 317 and internally meshed with the internal gear 321. ing. Therefore, this embodiment has the advantage that it can be manufactured at low cost since the number of gears is small.

In each of the above embodiments, the rotating shaft 15 is supported by the body frames 11A, 11B, but the present invention is not limited to this.
330 gears 21, 121, 219, 321 and gears 31, 131, 231, 331 (cam plate)
may be rotatably supported on the body 11, and the rotating shaft 15 may be rotatably supported between these gears.In short, if the rotating shaft 15 is rotatably supported on the body 11, good.

In addition, the operating parts 32A, 132A, 232A, 3
32A is not limited to a protrusion as in each of the above embodiments, but may be a recess, and may also be a gear 31, 131, 231, 3.
It is not limited to the one provided on the circumferential surface of 31 (cam plate), but other configurations such as those provided on the end surface may also be used.
In short, the operating parts 32A, 132A, 232 are part of the gears 31, 131, 231, 331 (cam plate).
A, 332A may be formed.

Furthermore, the detector does not have to be the limit switch 34 as in the above embodiment, but may be another switch such as a reed switch or an air switch, in short, the actuating parts 32A, 132A, 2
It is sufficient if it can operate in conjunction with 32A and 332A and extract electrical signals.

Further, the adjusting means is not limited to the configuration of the worm 25 and the gear 22 as in the above embodiment, but may include, for example, the gears 21, 121, 219, which are completely rotatable.
321 may be fixed with a lock screw passing through the body 11, or any other structure may be used.
However, if the above-mentioned embodiment or a combination of a worm and a worm wheel is used, fine adjustment can be made and an infinite rotation type can be used, so that the same effects as in the above-mentioned embodiment can be obtained.

In addition, if multiple devices of this embodiment are used,
There is an advantage that a device capable of positioning at the upper limit, the lower limit, or any position between them can be provided at low cost and in a small size.

〔Effect of the invention〕

As described above, according to the present invention, the electric blind positioning device is small and inexpensive, can be attached to any position on the winding shaft, and can easily and accurately position the slat at a predetermined position. can be provided.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the electric blind according to the present invention, FIG. 2 is a front view with one body frame of the position detection device removed, FIG. 3 is a side view thereof, and FIG. 5 is a front view showing another embodiment of the differential gear mechanism, FIG. 6 is a sectional view thereof, and FIG. 7 is a front view showing another embodiment of the differential gear mechanism. FIG. 8 is a sectional view thereof, and FIG. 9 is a front view showing another embodiment of the gear reduction mechanism.
FIG. 10 is a sectional view thereof. 2... Winding shaft, 3... Motor, 5... Slat, 7... Lifting string, 11... Body, 15... Rotating shaft, 30, 116... Hexagonal hole as a through hole,
21, 121, 221, 321...Gear as an adjustment gear, 23...Adjustment means, 30, 130, 2
30,330...Differential gear mechanism, 32,132,
232, 332...Cam as a rotating body, 32
A, 132A, 232A, 332A...actuating part,
33... Operating lever, 36... Roller, 34...
Limit switch as a detector.

Claims (1)

[Claims] 1. A positioning device for an electric blind that positions the slat at a predetermined position based on the amount of rotation of the winding shaft, by winding a lifting cord for raising and lowering the slat around a winding shaft driven by a motor, which , a rotary shaft rotatably supported by the body and having a through hole through which the winding shaft can be inserted while engaged along the central axis direction and rotating together with the winding shaft; a differential gear mechanism that decelerates the rotation of the rotating shaft and transmits the reduced rotation to the rotating body; The rotating body includes an adjusting means for rotating an adjusting gear of the differential gear mechanism to adjust the initial relative angular position between the operating portion of the rotating body and the rotating shaft, and a roller that slides on the rotating body at one end. an actuating lever that is displaced by an actuating section; a detector that biases the roller toward the rotating body via the actuating lever and stops driving the motor when the actuating lever is displaced by the actuating section; An electric blind positioning device characterized by comprising: