JPS60230493A - Location apparatus of electromotive blind - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to electric blinds, and more particularly to a blind positioning device that positions the slats of the blind at a predetermined position 1, 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 upper position of the slat and the stop position when lowered are detected, and when the slat reaches the stop position, the motor is activated. It is necessary to stop the slats and position the slats in place. In particular, when electric blinds are attached to a window frame, if the lower end of the slat (bottom rail) does not approximately match the lower frame of the window frame when lowering, for example, the bottom rail will ride on the lower frame and the slat will fall. If the slats are sagging, it will cause the slats to sway due to the air being blown for heating and cooling.

Conventionally, electric blind positioning devices have been used for slab I/
A feed screw shaft rotated by a motor that winds up and down a lifting cord, a nut member screwed onto the feed screw shaft and moved linearly along a predetermined guide, and a limit switch operated by the nut member. When the limit switch is activated by a nut member that moves along the feed screw shaft as the motor rotates, the limit switch stops the rotation of the motor.

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. There is also a drawback that the operating accuracy of the limit switch is poor due to the influence of backlash between the feed screw shaft and the nut member.

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

[Object of the Invention] An object of the present invention is to provide an electric blind positioning device that is small, inexpensive, and has high positioning accuracy.

[Configuration of the Invention] Therefore, the configuration of the present invention is an electric type in which a lifting cord for raising and lowering the slat is wound around a winding shaft driven by a motor, and the slat is positioned at a predetermined position based on the amount of rotation of the winding shaft. A positioning device for a blind, comprising: a pode, a rotary body rotatably provided in the pode and having an operating section, and a rotary body provided in the pode that decelerates the rotation of the winding shaft and transmits it to the rotary body. an actuating lever that has a roller at one end that slides into contact with the rotating body and is displaced by an actuating section of the rotating body; The present invention is characterized by comprising a detector that stops driving the motor when the operating lever is displaced.

[Example] Fig. 1 shows the front side of an electric blind according to the present example. In the figure, a winding shaft 2 is rotatably supported inside a rectangular cylindrical head box l along its longitudinal direction. A motor 3 is connected to one end of the winding shaft 2.

Drums 4 are provided at positions slightly inward from both ends. Each drum 4 has -, an end connected to the head box l.
The other end of the lifting cord 7, which is connected to the bottom rail 6 through a number of slats 5 arranged parallel to each other, is wound below. As a result, when the motor 3 is driven to rotate forward, for example, by operating the push button switch 8, the winding shaft 2
When the motor 3 is rotated in the opposite direction, the lifting string 7 is unwound from the drum 4 and the slat 5 is lowered by the forward rotation of the winding shaft 2.
is rolled up and the slat 5 is raised.

Also, limit switches 9 are provided on both ends of the lower surface of the head box l, which are activated by the bottom rail 6 when the slat 5 is raised. Furthermore, a position detecting device 10 is provided in the middle of the winding shaft 2 to detect 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 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. It is now possible to do so.

FIGS. 2, 3, and 4 show the position detection device IO. □ In these figures, the podium 11 is configured □ in the shape of a box with a cavity 12 inside by two podium frames IIA and IIB that fit together. A through hole 13 is formed in each of the body frames 11A and IIB, and a hub portion 14 is formed inside each through hole '13.
are formed respectively. A rotary shaft 15 is rotatably supported between the two prize holes 13. The rotating shaft 15 has
A hexagonal hole 16 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.

A first internal gear 21 rotatably supported on the outer periphery of one end of the rotating shaft 15 is internally meshed with one large diameter gear 19 of the two-stage external gear 18 . First internal gear 2
A gear 22 is integrally formed on the outer end side of the outer peripheral surface of 1, and an adjusting means 23 is meshed with this gear 22. The adjustment means 23 includes an adjustment shaft 24 which is inserted into the pode frame 11A of the pode 11 and is rotatably supported with a certain resistance by, for example, a flat washer and a spring washer, and is provided at the tip of the adjustment shaft 24. The gear 22
The worm 25 is meshed with the worm 25. The base end of the adjustment shaft 24 is formed into a box shape having a hexagonal hole 26 inside, and faces a recess 28 of a bulge 27 that bulges out from the lower surface of the podium frame 11A. As a result, insert a suitable hexagonal wrench into the hexagonal hole 26 and adjust the adjustment shaft 2.
When 4 is rotated, the gear 22 meshed with the worm 25
While the first internal gear 21 rotates around the hub portion 14 due to the action of Therefore, the signal is not transmitted to the adjustment shaft 24. Therefore,
Unless the adjustment shaft 24 is rotated, the first internal gear 21 is fixed at a predetermined position with respect to the Pod 11.

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 two-stage external gear 18, the first internal gear 21, and the second internal gear 31 constitute a gear reduction 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, in the podium frame 11A of the podium 11, a substantially central portion of the operating lever 33 whose other end faces the cam 32 of the second internal gear 31 is attached to a pin 3.
5. Actuation lever 3
3 is provided with a roller 36 that rolls along the cam 32 of the second internal gear 31 at the other end, and one end is provided with the roller 36 that rolls along the cam 32 of the second internal gear 31.
1 It is projected outside. 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 straight line connecting the center of the pin 35 and the center of the roller 36 is The actuating portion 32A of the cam 32 is arranged so as to substantially coincide with the tangent from the actuating portion 32A of the cam 32.

Further, a limit/limit switch 34 as a detector is attached to the outside of the pod 11 facing one end of the operating lever 33. The limiter/l switch 34 is inserted into and fixed to mounting pins 37 and 38 which are provided in parallel to the outside of the podium frames 11A and 11B of the podium 11, respectively.

As a result, as the second internal gear 31 rotates, the cam 3
2 operating part 32A/<-33 is pin 3
5 as a fulcrum, the limit switch 34 is turned on or off. Then, the driving of the motor 3 is stopped.

Next, the operation of this embodiment will be explained. First, when the motor 3 is driven to rotate in the forward direction by operating the push button switch 8, as the winding shaft 2 rotates forward, the lifting string 7 is unwound from the drum 4 according to the amount of rotation of the winding shaft 2. , the slat 5 is 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 two-stage external gear 18 attached to the eccentric cam 17 of the rotating shaft 15 also tries to rotate, but one gear 19 of the two-stage external gear 18 is fixed by the action of the adjusting means 23. Since it is meshed with the first internal gear 21 in the state, it rolls on the internal teeth of the first internal gear 21 and is decelerated by the number of teeth. At the same time, with the transfer of this one gear 19, the other gear 20 also rotates, so this other gear 20
The second internal gear 31 meshed with the second internal gear 31 is further decelerated by the number of teeth and rotates on the rotating shaft 15. In this manner, the rotation of the second internal gear 31 sequentially moves the operating portion 32A of the cam 32 provided on the circumferential surface of the second internal gear □031. 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, the rotation direction of the cam 32 is opposite to the rotation direction. This state is maintained without play, that is, backlash of the gear reduction mechanism 30 and the like.

Eventually, when the actuating portion 32A of the cam 32 reaches the roller 36, 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. Ru. As a result, the forward rotation drive of the motor 3 is automatically stopped.

At this time, the position of the first internal gear 21 is adjusted so that the bottom rail 6 stops descending (the second position is the correct position, for example, the lowest edge of the window frame). Insert a suitable hexagonal wrench into the hexagonal hole 26 of the shaft 24,
By rotating the adjustment shaft 24, the first internal gear 21 can be rotated via the worm 25 and the gear 22 as the adjustment shaft 24 rotates. First internal gear 21
When the second internal gear 31 rotates, the second internal gear 31 rotates via one gear 19 and the other gear 20, and the rotation of the second internal gear 31 changes the initial position of the operating portion 32A of the cam 32. , since the time from the start of rotation of the winding shaft 2 until the limit switch 34 is activated by the actuator 32A, that is, the rotational speed of the winding shaft 2, changes, the position of the bottom rail 6 is adjusted to the downward stop position. can do.

For example, when the cam 32 rotates counterclockwise in FIG. 2 and the limit switch 34 is actuated by the edge of the actuating portion 32A via the actuating lever 33, the bottom rail 6 is moved to the lower frame of the window frame. In this case, assume that it stopped slightly above.

The cam 32 rotates clockwise in the figure W42.
After rotating the internal gear 21, when the motor 3 is driven to rotate in the forward direction again, the cam 32 is rotated counterclockwise in FIG. When the switch 34 is activated again, the forward rotation drive 1 of the motor 3 is stopped. Therefore, in this way, the lowering stop position F of the bottom rail 6 can be adjusted to match the lower frame of the window frame. At this time, when adjusting the cam 32
When rotating clockwise in FIG. 2, that is, when rotating in the opposite direction to the direction of rotation by the motor 3,
Since there is no play in that direction, the position can be adjusted 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 string 7 is wound around the drum 4 in accordance with the amount of rotation of the winding shaft 2.
The slat 5 is being raised. Eventually, the bottom rail 6
When the motor reaches the 112A 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, slat 5
is automatically stopped at the upper limit position of winding.

Therefore, according to this embodiment, a planetary gear mechanism or a differential mechanism is used instead of using a long member such as the feed screw shaft in the conventional example, so that the outer 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.

In particular, in this embodiment, the cam 32 is attached to the other end of the operating lever 33.
Since a roller 36 is provided that slides on the roller 36 and a limit switch 34 is brought into contact with one end of the roller 36, the spring force inside the limit switch 34 prevents positioning errors due to backlash of the gear reduction mechanism 30 when the cam 32 rotates in forward and reverse directions. You can do less. Moreover, the radius of the roller 36 is made slightly larger than the height of the actuating part 32A, and the straight line connecting the center of the roller 36 and the rotation fulcrum of the actuating lever 33, that is, the center of the pin 35, is made a tangent from the actuating part 32A of the cam 32. Since they are substantially matched, the amount of displacement of the actuating lever 33 can be made large for a small rotation angle of the cam 32 under any conditions when the cam 32 rotates in the forward and reverse directions. Positioning during forward and reverse rotation can be performed finely and accurately without causing errors.

Further, since the adjustment means 23 that determines the timing of operating the limit switch 34 is composed of the adjustment shaft 24 having the worm 25 and the gear 22, there is no problem even if the adjustment shaft 24 is turned endlessly. Unlike the conventional example, the device is not damaged due to over-operation of the adjusting means.

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, unlike the conventional micro Wiring by lead wires when the switch is movable can be eliminated, improving work efficiency and preventing occurrence of poor conduction and the like.

In addition, POD 11 is placed in two POD frames 11A and IIB.
Since the limit switch 34 is inserted into the two mounting pins 37 and 38 protruding from the outside of both the Pode frames 11A and IIB, the limit switch 34 is not only easy to install, but also limit switch 3
4 has the advantage of being able to integrate both Pode slots 11A and IIB.

In addition, in implementation, as a gear reduction 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, in the gear reduction mechanism 130 shown in FIGS. 5 and 6, an eccentric arm 117 is integrally formed approximately in the longitudinal direction of the outer circumference of the rotating shaft 15, and a two-stage external gear 118 is rotated by the eccentric arm 117. A first gear 121 rotatably supported on the outer periphery of one end of the rotating shaft 15 is meshed with one large-diameter gear 119 of the two-stage external gear 118. A second gear 131 rotatably supported on the outer periphery of the other end of the rotating shaft 15 is meshed with the other smaller diameter gear 120 of the two-stage gear 118 . The adjusting means 23 is meshed with the outer periphery of the outer end of the first gear 121 . Further, a limit switch 3 is connected to the outer end of the second gear 131 via the operating lever 33.
A cam 132 having an actuating portion 132A for actuating the actuator 4 is formed.

Therefore, in this embodiment, the first gear meshing with the two-stage external gear 118 is used. Since the second gears 121 and 131 may be external gears, there is an advantage that they can be manufactured at a lower cost than the internal gears described in FIGS. 2 to 4.

In addition, in the gear reduction mechanism 230 shown in FIGS. 7 and 8, a support shaft 217 is integrally formed at right angles to the rotation shaft 15 approximately in the longitudinal direction of the outer circumference of the rotation shaft 15.
A planetary bevel gear 218 is rotatably attached to the planetary bevel gear 218 , and one bevel gear 220 of a double-sided bevel gear 219 rotatably supported on the outer periphery of one end of the rotating shaft 15 is attached to the planetary bevel gear 218 . A bevel gear 231 rotatably supported on the outer periphery of the other end is 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 that operates 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 embodiment, since only the bevel gear needs to be machined, it has the advantage that it can be manufactured at a low cost, similar to the embodiments shown in FIGS. 5 and 6.

In addition, the gear reduction mechanism 330 shown in FIGS. 9 and 10
Here, a gear 317 is installed approximately in the longitudinal direction of the outer circumference of the rotating shaft 15.
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. Additionally, three support bins 3 are provided at equal angle positions on the inner surface of the cam plate 331.
18 is provided protrudingly, and the gear 31 is attached to each support bin 318.
A planetary gear 3 is externally meshed with 7 and internally meshed with 8 the internal gear 321.
19 are rotatably supported. 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 podium frames 11A and IIB, but the present invention is not limited to this. gears 21, 121,
219, 321 and gears 31, 131, 231, 33
1 (cam plate) may be rotatably supported on the podium ti, and the rotating shaft 15 may be rotatably supported between these two gears.In short, the rotating shaft 15 is rotatably supported on the podium 11
It suffices if it is rotatably supported.

Further, the actuating parts 32A, 132A, 232A, 332A are not limited to the projections as in the above embodiments, but may be four parts, and are limited to those provided on the circumferential surface of the gears 31, 131, 231, 331 (cam plate). Alternatively, the gears 31, 131, 231, etc. may be provided on the end face.
331 (cam plate) has operating parts 32A, 132A,
It is sufficient that 232A and 332A are 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. It only needs to work and output an electrical signal.

Further, the adjusting means is not limited to the configuration of the worm 25 and the gear 22 as in the above embodiment, but for example, the gears 21, 121, 219, 321, which are completely rotatable, may be fixed with a locking range passing through the podium. or any other structure. However, if the embodiment described above uses a combination of a worm and a worm wheel, fine adjustment is possible and it can be made infinitely rotatable, so that the same effects as in the embodiment described above can be obtained.

In addition, if a plurality of 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.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a small, inexpensive, and highly accurate electric blind positioning device.

[Brief explanation of the drawing]

Fig. 1 shows an electric blind according to the present invention. 6 is a front view showing another embodiment of the gear reduction mechanism, FIG. 6 is a sectional view thereof, FIG. 7 is a front view showing another embodiment of the gear reduction mechanism, and FIG. 8 is a sectional view thereof. Fig. 9 is a front view showing another embodiment of the gear reduction mechanism, and Fig. 10 is a sectional view thereof. 2... Winding shaft, 3... Motor, 5... Slat,
7... Lifting string, 11... Pode, 15... Rotating shaft, 30,130.230.330... Gear reduction mechanism,
32. ■32.232,332...Cam as a rotating body, 3102A, 132A, 232A, 332A...Operating part. 33... Operating lever, 36... Roller, 34...
Limit switch as a detector. Agent Patent attorney Minoru Kinoshita (and 1 other person) 2 Figure 2 Figure 3 Figure 1 Figure 5 Figure 6 Figure 1 Figure 8 11 Figure 9 Figure 10 Figure 1

Claims (1)

[Claims] (1) A positioning device for an electric blind that positions a slat at a predetermined position based on the amount of rotation of the winding shaft, by winding a lifting cord that raises and lowers the slat around a winding shaft driven by a motor, which , a rotary body rotatably provided in the body □ and having an operating section; a gear reduction mechanism provided in the body and configured to decelerate the rotation of the winding shaft and transmit it to the rotary body; An actuation lever has a roller that slides on the rotating body and is displaced by an actuating part of the rotating body, and biases the roller toward the rotating body through this actuating lever, and when the actuating lever is displaced by the actuating part, the actuating lever A positioning device for an electric blind, comprising: a detector for stopping driving of a motor.