JPH0511821Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a curtain opening/closing device that opens and closes curtains using a motor. In particular, an extremely thin linear motor is applied to a curtain rail, and a moving moving coil is connected to the curtain rail. The present invention relates to an improvement of a linear motor type curtain opening/closing device which is integrally connected to a runner and opens/closes the curtain by running the moving coil.

(Prior Art) Recently, curtain opening/closing devices using thin linear motors have been developed for curtain opening/closing devices that use pleated fabrics that have short rails, are lightweight, and are easy to fold, such as automobile curtains. is put into practical use. This type of linear motor type curtain opening/closing device has a stator rail with an inverted U-shaped cross section, and a flat plate on the inner surface of one side of the stator rail, which is magnetized in the thickness direction and arranged so that adjacent magnetic poles have different polarities. a permanent magnet, a moving coil that runs guided by the permanent magnet inside the stator rail, and an overhead wire for energizing the moving coil. The curtains are configured to open and close as the vehicle travels.

(Problem that the invention aims to solve) However, in order to open and close curtains like residential curtains, which have long rails, large curtain fabrics, and are heavy, the curtain opening/closing device using the thin linear motor described above does not have sufficient thrust. However, it was difficult to open and close the curtains smoothly. In particular, when opening curtains, a strong repulsive force is generated at the folded part of the curtain, but this repulsive force increases rapidly as the amount of folding of the folds increases.
It was even more difficult to fully open the curtains using a thin linear motor.

On the other hand, by increasing the thrust of the moving coil, it is possible to smoothly open and close the curtain, but this requires increasing the rail cross section and the moving coil, which increases the size of the device and increases power consumption. There was a problem that the amount of water was also increasing.

(Means for Solving the Problems) In view of the above problems, the present invention provides a linear motor type curtain opening/closing device that can smoothly open and close long and heavy curtains using a thin linear motor. With the goal.

The present invention in accordance with this object provides a linear motor type curtain opening/closing device that includes a stator rail and a movable coil disposed in the stator rail so as to be movable, and opens and closes the curtain by running the movable coil. Multiple moving coils are distributed within the child rail, and the thrust of each moving coil is set so that the thrust of the preceding moving coil in the curtain closing direction is greater than the thrust of the following moving coil. The gist is that.

(Function) According to the above configuration, the entire load for opening and closing the curtain is shared by multiple moving coils, so a heavy curtain can be smoothly opened and closed without increasing the size of each moving coil. becomes possible. Also, if multiple moving coils are simply provided, when the curtain is closed, the middle moving coil will move further than necessary, causing the folds at the front of the closed curtain to be dense and the folds at the rear to close. It may become rough and spoil the appearance of the curtain. However, since the thrust of each moving coil was set so that the thrust of the preceding moving coil in the curtain closing direction was greater than the thrust of the following moving coil, when each moving coil was energized for a certain period of time, The larger the moving coil is, the larger the moving amount is, and the moving amount of the succeeding moving coils becomes smaller in sequence. As a result, when the movable coils are stopped, appropriate spacing is created between each movable coil, and the folds that occur when the curtain is closed are uniformly formed.

(Example) Examples of the present invention will be described in detail below based on the drawings. FIG. 1 is a front view of a linear motor type curtain opening/closing device showing an embodiment of the present invention, and FIG.
The figure is an enlarged sectional view taken along the line X--X in FIG. 1, and FIG. 3 is an exploded perspective view of the main parts. Figures 1 to 3
In the figure, reference numeral 1 denotes a stator rail, which has an approximately inverted U-shaped cross section. A permanent magnet 2 is provided inside along the longitudinal direction, and is held by a long magnet holding member 3 having a U-shaped cross section. A yoke 4 is fixed to the inner surface of one side of the stator rail 1, and a yoke 4 is interposed between the stator rail 1 and the permanent magnet 2. A large number of runners 6 for hanging the curtain 5 are slidably attached to the magnet holding member 3, and three movable coils 8 each have a runner 7 integrally formed on the bottom surface and a brush provided on the side surface. 8' and 8'' are slidably fitted together.The curtain 5 is suspended by these runners 6 and 7. Note that 8a and 8b are brushes provided on the movable coil 8. , the other moving coils 8', 8'' are similarly provided with brushes. The stator rail 1
On the inner surface of the other side of the yoke 10, there is an overhead wire 9 formed with a copper foil pattern 9' having a predetermined shape to supply current to each moving coil 8, 8', 8'' via a brush.
It is attached via. Furthermore, a rail end 11 is fixed to the end surface of the stator rail 1, which supplies current to the overhead wire 9 and functions as an end stopper for the movable coil 8.

As shown in FIG. 4, the permanent magnet 2 consists of a large number of magnet pieces 2', 2', etc. arranged at a constant pitch, and each magnet piece 2' is magnetized in the thickness direction, and the adjacent magnetic poles are magnetized. They are arranged with different polarities.
On the other hand, the movable coil 8 is composed of a pair of drive coils 12 and 13, as shown in FIG.
Each drive coil 12, 13 is wound so that a current I flows in a direction perpendicular to the magnetic flux H, and when current is applied to each drive coil 12, 13 from the overhead wire 9, the current I flows parallel to the stator rail 1 according to Fleming's left hand rule. A thrust force F is generated in the direction. At that time, each drive coil 12, 13 has an overhead wire 9 so that the thrust generated in the drive coil 12 and drive coil 13 is always in the same direction.
Current is alternately supplied from the copper foil pattern 9' formed on the magnet piece 2' in accordance with the polarity of the magnet piece 2'. This causes the movable coil 8 to move continuously in a fixed direction, and the moving direction can be switched by reversing the polarity of the current.

Returning to FIG. 1, in this embodiment, the total load W required to fully open or close the curtain 5 is divided into the load W required to open and close the curtains in sections a to b.
Load required to open and close curtains in sections b to c
w' and the load w'' required to open and close the curtains in sections c to d, and each load w, w', w'' is distributed to the movable coils 8, 8', 8'', respectively. Thrust forces F, F' of coils 8, 8', 8'',
F″ is set so that the thrust of the preceding moving coil in the closing direction of the curtain 5 is larger than the thrust of the following moving coil, that is, F″>F′>F, and is set to a predetermined value. When a time current is supplied, the moving coil 8 moves by a distance l ₁ in the sections a to b, the moving coil 8' moves by a distance l ₂ in the sections a to c, and the moving coil 8'' moves in the sections a to d. It is set to move only a certain distance.

By the way, the thrust force F of the moving coil in a linear motor is expressed by the following formula, where N is the number of turns of the coil, I is the current flowing through the coil, B is the magnetic flux density, and L is the width of the permanent magnet.F=2NIBL Determine the thrust force F. Among the various factors, B and L are constant values for a particular stator rail 1, but N and I can be changed. As shown in Fig. 6, NI is directly proportional to the wire diameter φ of the winding used for the drive coils 12, 13, so by appropriately selecting the wire diameter φ, the thrust force F, Set F′ and F″ to desired values.

The present embodiment has the above configuration, and its operation will be explained next. In FIG. 4, when the left end of the movable coil 8 is at position _P1 , the drive coil 12 is connected from the copper foil pattern 9' of the overhead wire 9 via the brush 8a.
A current I flows through the drive coil 12, a thrust F is generated in the drive coil 12 according to Fleming's left-hand rule, and the movable coil 8 moves in the direction of closing the curtain 5. When the left end of moving coil 8 reaches position _P2 , drive coil 1
2 is no longer energized, and the drive coil 13 is instead energized from the copper foil pattern 9' through the brush 8b, and a thrust F in the same direction as the drive coil 12 is generated in the drive coil 13, and the movable coil 8 is further moved by the curtain. Move in the closing direction. In this way, the movable coil 8 moves forward continuously, moves within the stator rail 1 by a distance l ₁ during a predetermined energization time, and moves from section a to
Close the curtain 5 of b. While the moving coil 8 moves forward, the moving coil 8' similarly moves by a distance _l2 to close the curtain 5 in sections b to c, and the moving coil 8'' moves by a distance _l3 to close the curtain in sections c to d. 5. If the polarity of the supplied current I is reversed, the direction of the thrust generated in each moving coil 8, 8', 8'' will be reversed, and the moving coils 8, 8', 8'' will close the curtain 5.
Move in the direction of opening. When opening and closing the curtain 5, the total load W for opening and closing the curtain 5 is w,
Each moving coil 8, 8' is divided into three parts w', w'',
8", so even if the curtain 5 is long and heavy, it can be opened and closed smoothly. In particular, when opening the curtain 5, the repulsive force generated at the folded part of the pleats increases as the amount of folding increases. In this example, the repulsive force of the pleats in sections a to b is caused by the movable coil 8, the repulsive force of the pleats in sections b to c is caused by the moving coil 8', and the repulsive force of the pleats in sections c to d increases rapidly. The force is borne by the moving coil 8''. In this way, each movable coil shares the repulsive force of the pleats, so the curtain 5 can be completely opened. Furthermore, if the load is shared by simply providing three moving coils 8, 8', 8'', when the curtain 5 is closed, each moving coil 8,
8' moves too much and reaches the right end of the stator rail 1, and as a result, the folds on the right side of the curtain 5 become dense and the folds on the left side become coarse, which may damage the appearance of the curtain 5. There is. However, as mentioned above, the thrust force F of each moving coil 8, 8', 8''
F' and F'' are set so that F''>F'>F, so if the power is stopped when the moving coil 8'' reaches the right end, there will be a gap between each moving coil 8, 8', and 8''. Appropriate intervals l ₁ , l ₂ , l ₃ are formed, and the folds of the curtain 5 are uniform. Of course, even if the energization is stopped before the movable coil 8'' reaches the right end, appropriate intervals will still be created between the movable coils 8, 8', 8'' depending on the energization time, and the pleats will also be formed uniformly. Ru.

In this embodiment, three moving coils are provided in the stator rail 1, but the number is not limited to this, and the number can be increased or decreased as appropriate depending on the length of the stator rail and the weight of the curtain. Well, in that case,
The thrust of the movable coil may also be appropriately set accordingly.

(Effects of the invention) According to the invention, since the plurality of moving coils are distributed in the stator rail, the entire load when opening and closing the curtain is shared by the plurality of moving coils. Therefore, even long and heavy curtains can be smoothly opened and closed without increasing the size of each movable coil, and the device can be downsized and its power consumption can be reduced. In addition, if multiple moving coils are simply provided, the intermediate moving coil will move further than necessary, resulting in dense folds at the front of the closed curtain and rough folds at the rear, resulting in an appearance. However, since the thrust of each moving coil was set so that the thrust of the preceding moving coil in the curtain closing direction was greater than the thrust of the following moving coil, the The folds are formed uniformly and do not spoil the appearance of the curtain.

[Brief explanation of the drawing]

FIG. 1 is a front view of a linear motor type curtain opening/closing device showing an embodiment of the present invention, and FIG.
Fig. 3 is an exploded perspective view of the main parts, Fig. 4 is an explanatory diagram of the operation of the linear motor used in this example, and Fig. 5 is an enlarged sectional view taken along the line X-X in the figure. An enlarged front view with a part of the moving coil cut away, FIG. 6 is an explanatory diagram showing the relationship between the winding diameter of the moving coil and the thrust, and FIG. 7 is an explanatory diagram showing the state of the folds when the curtain is closed. It is a diagram. 1... Stator rail, 8, 8', 8''... Moving coil.

Claims (1)

[Scope of Claim for Utility Model Registration] A linear motor curtain opening/closing device comprising a stator rail and a movable coil disposed so as to be movable within the stator rail, and opening and closing the curtain by the running of the movable coil, comprising: Multiple moving coils are distributed within the stator rail, and the thrust of each moving coil is set so that the thrust of the preceding moving coil in the curtain closing direction is greater than the thrust of the following moving coil. A linear motor type curtain opening/closing device characterized by: