JP3018077B1 - Blind switchgear - Google Patents

Abstract

[PROBLEMS] To open a blind, the louver group can be pulled one by one from the end runner side to the front, in contrast to the conventional method, to solve the problem of damage to the runner and the drive shaft due to wear. Improve the appearance when the blinds are opened halfway. SOLUTION: Runner connection holes 26 are provided at regular intervals in a runner running endless belt 5 which can circulate along a rail. Inside each runner 2, a belt connecting pin 20 that can move back and forth between a position engaging with the runner connecting hole 26 and a retracted position that does not engage, and attaching the belt connecting pin 20 to a position engaging with the runner connecting hole 26. And a biasing spring. A belt is provided on the rear surface of each runner, and when a front runner overlaps with the front surface of each runner, the belt runs into the receptacle and retracts the belt connecting pin 20 to the retracted position against the spring. A connecting pin operating projection 22 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing device for a blind in which a louver is hung on a plurality of runners, the blind being closed while increasing the interval between the louver groups, and opening the blind while overlapping the louver groups.

[0002]

2. Description of the Related Art In a conventional blind of this kind,
When opening the blinds, I pulled the top runner with the drive cord and pulled it from the top runner's louver one after another to collapse the louver.

[0003]

Therefore, when the blind is partially opened, the louver group moves in an overlapping state at the opening end, so that the load on the drive shaft that opens and closes increases, and the load is increased due to wear. The runner and drive shaft were damaged, and the appearance was bad.

In general, when the tilt cord is pulled to rotate the tilt shaft, the carriers of all the runners penetrating the tilt shaft rotate at the same time, so that the angles of the louvers change simultaneously. And
When the blinds are closed, the louvers are
When viewed from the front, the parts always overlap each other.

[0005] When the louver is an ordinary flat plate,
The overlap of the front and back of the part of the louver is the overlap of the plane and the plane, which is the same even if the direction of the louver is simultaneously rotated by about 180 degrees with the tilt shaft and the front and back of the louver are simultaneously reversed and turned over Therefore, in either case, it is possible to pull the louvers of the top runner one after another to open the blinds.

However, as described in Japanese Utility Model Publication No. Hei 7-14623, the left and right halves of the louver are curved in opposite directions so as to have a wavy three-dimensional effect. In the case of the blind having the above configuration, in a normal closed configuration as shown in FIG. 1 (A), the curved portions overlap each other so that the curves engage with each other, and the direction of the louver 4 is almost simultaneously changed in the direction of the arrow by the tilt shaft. When the front and back surfaces of the louver 4 are simultaneously rotated by 180 degrees, the louvers are in a back-to-back state in which the louvers cross each other as shown in FIG. 1 (B), and in both cases (A) and (B), It is difficult to open the blinds by pulling one by one from the top runner louvers one after another.

[0007] The present invention solves the problem of breakage of the runner and the drive shaft due to wear by allowing the louver groups to be pulled one after another from the end runner side, in contrast to the conventional case, when opening the blind. With
Blind opening / closing that improves the appearance when the blind is opened halfway, and that allows the blind to open and close without any trouble even if the blind uses a louver with an irregular S-shaped cross section, for example, as described above. It is to provide a device.

[0008]

A blind opening and closing device according to the present invention comprises a group of runners 2 running along a rail 1.
In each blind hung louver 4
Runner connecting portions 26 are provided at regular intervals on the runner running endless belt 5 that can circulate along the rails 1, and each runner 2 advances and retreats to a position engaging with the runner connecting portions 26 and a retreat position not engaging. Possible belt connecting pins 20
And a spring 21 for urging the belt connecting pin 20 to a position where the belt connecting pin 20 engages with the runner connecting portion 26. Further, a receiving port 23 is provided on the rear surface of each runner 2 and one front is provided on the front surface of each runner 2. When the runners overlap each other, a belt connecting pin operating projection 22 is provided which projects into the receiving port 23 and retracts the belt connecting pin 20 to the retracted position against the spring 21.

According to such a structure, the endless runner 5 is circulated in one direction to stop the end runner first, and when the next second runner approaches and overlaps with this end runner, this The belt connection pin operation projection 22 of the end runner enters the receptacle of the second runner, and the belt connection pin 20 of the second runner retreats, and the runner connection portion 2 of the endless belt 5 for runner traveling.
6 and stops with the second runner overlapping the end runner. The endless belt 5 for runner traveling is further circulated in the same direction, and when the third runner approaches and overlaps the stopped second runner, the belt connection of the second runner to the receptacle of the third runner. The pin operating projection 22 enters, and the belt connecting pin 20 of the third runner retreats and disengages from the runner connecting portion 26 of the endless belt 5 for runner traveling. .

Therefore, the louver group 4 is successively folded forward from the end runner side.

The runner connecting portion 26 of the runner running endless belt 5 is preferably a hole.

In each runner 2, a pinion 18 rotatable around a tilt shaft 6 for simultaneously changing the direction of the louver group 4 and a belt connecting pin operating protrusion 22 protruding from a receiving port 23 are connected. If a cam 18a for rotating the pinion 18 is provided and a rack portion 20a meshing with the pinion 18 is provided on the belt connecting pin 20, the belt connecting pin 20 can be smoothly advanced and retracted.

An end stopper 28 is provided at one end of the rail 1.
Is fixed, and a belt connecting pin operating projection 22 for projecting into the receiving port 23 of the end runner 2 and retracting the belt connecting pin 20 is provided.
Of the belt connecting pin 20 can be moved by the end stopper 28.

The top runner 2t is provided with a runner restricting stopper 44 capable of restricting the travel of the top runner 2t with respect to the rail 1 and releasing the same, and the direction in which the louver 4 closes (the direction parallel to the axis of the rail) on the top runner 2t. When the louver 4 is closed, the stopper 44 for operating the runner restrictor is operated to the travel restricting position when the louver 4 is closed, and is returned to the release position when the open direction (direction intersecting with the axis of the rail) is provided. The runner 2 is restricted from running.

[0015]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

First, the outline will be described. In the blind of this embodiment, as shown in FIG. 2, a plurality of runners 2 as shown in FIGS.
The louver 4 is suspended from the carrier 3 mounted on each runner 2, and the runner group 2 can be slid along the rail 1 by the endless belt 5 for running the runner circulating in the rail 1. The carriers 3 of all the runners 2 can be simultaneously rotated by the penetrating tilt shaft 6 to change the directions of all the louvers 4 at the same time, and the louver reversing endless belt 7 circulating in the rails 1.
Thus, the carriers 3 of the respective runners 2 can be sequentially rotated individually and the direction of the front and back of the louver 4 can be sequentially reversed one by one. As shown in FIG. 3, each louver 4 has an inverted S-shaped cross section. 3 and 4
And the like, the direction of the louver group 4 with respect to the runner group 2 is shown separately from the runner group 2.

The rail 1 is formed of aluminum in a box shape, and has upper and lower three-stage guides, that is, an upper belt guide for guiding an endless belt 7 for louver reversal, as shown in FIGS. A runner guide section 9 for guiding the runner group 2 and a lower belt guide section 10 for guiding the runner endless belt 5 are formed. FIG.
5 shows a part of the endless belt 5 for runner traveling and the endless belt 7 for louver reversal. The runner group 2 is horizontally slidably mounted on the rail 1 by slidably fitting the convex portions 11 on both side surfaces of the runner group 2 to the runner guide portions 9 in the middle stage on both sides.

As shown in FIGS. 5 and 6, each runner 2 is molded into a box shape with a resin, and
And a belt connecting pin access mechanism chamber 13 are formed side by side in the runner traveling direction to form a partition, and a connecting recess 14 is formed. As is well known, the runner 2 group includes a tip claw 15a of a connecting tongue piece 15 protruding from its own connecting recess 14.
Are protrusions 14 in the connection recesses 14 of the adjacent runners 2.
By engaging with a, as shown in FIGS. 3 and 4,
The beads are connected to each other at predetermined intervals to follow the preceding runner 2.

Therefore, in the following description, the distance between the runner groups 2 is widened, the louver group 4 is pulled out, and the blind is closed in the closing direction (left side in FIGS. 3 and 4). The direction in which the louver group 4 is narrowed and folded and the blinds are opened (the right side in FIGS. 3 and 4) is defined as the rear.

As shown in FIG. 7, a worm gear 16 and a part of the carrier 3 which rotate integrally with the penetrating tilt shaft 6 are accommodated in the carrier rotation mechanism chamber 12 of each runner 2. , Career 3
The carriers 3 of all the runners 2 are simultaneously rotated when the tilt shaft 6 rotates, as is well known.

As shown in FIG. 8, a pinion 18 which penetrates the tilt shaft 6 and is rotatable with respect to the tilt shaft 6, and integrated with the pinion 18, are provided in the belt connection pin access mechanism chamber 13 of each runner 2. A provided cam 18a, a belt connecting pin 20 having a rack portion 20a that meshes with the pinion 18, a belt connecting pin 20 that protrudes and retracts from one side of the runner 2 with the rotation of the pinion 18, and projects the belt connecting pin 20. A spring 21 biasing in the direction is disposed.

As shown in FIG. 5, a belt connecting pin operating projection 22 for operating the belt connecting pin 20 of the runner 2 at the front is integrally provided on the front surface of each runner 2, and is integrally provided on the opposite surface. As shown in FIG. 6, on the rear surface of each runner 2, the leading end of the belt connection pin operating projection 22 of the rear runner 2 is received in the belt connection pin access mechanism chamber 13 and engaged with the cam 18a. Socket 23 is formed.

On the other hand, as shown in FIGS. 3 and 4, the runner running endless belt 5 on the rail side is wrapped around sprocket wheels 24 and 25 supported at both ends of the rail 1, and an open / close cord (not shown). Is operated to rotate one (the right side in the figure) sprocket wheel 25, whereby the rail 1 circulates along the lower belt guide portion 10. As shown in FIGS. 10 and 15, the endless belt 5 for runner running has a belt connecting pin as a runner connecting portion that engages with the belt connecting pin 20 to connect the endless belt 5 for runner running and the runner 2. A large number of runner connection holes 2 for freely receiving the tip portions of 20 one by one.
6 are provided at regular intervals (corresponding to the intervals by the connecting tongue pieces 15).

As shown in FIG. 10, an end stopper 28 which does not run is fixedly installed near the right sprocket wheel 25. This end stopper 2
8, a belt connecting pin operating projection 22 and a connecting tongue 15 similar to the belt connecting pin operating projection 22 of the runner 2 are also provided. The end stopper 28 penetrates the tilt shaft 6 as it is.

Therefore, when the endless belt 5 for running a runner is circulated in the direction of arrow A in FIG. 3 to close the blinds, the runner 2 having the belt connecting pin 20 inserted into the runner connecting hole 26 becomes an endless belt for the runner running. 5, when the blinds are sequentially driven forward and the blinds are closed to the end, the belt connecting pins 20 of all the runner groups 2 enter the runner connecting holes 26 and are arranged at equal intervals, as shown in FIG.

On the other hand, when the endless belt 5 for running the runner is circulated in the direction of arrow B in FIG. 10 to open the blinds, the runner group 2 runs backward. First, as the rearmost (right end) end runner 2 collides with the end stopper 28 as shown in FIG.
The belt connection pin operation projection 22 of this end runner 2
The pinion 18 rotates about the tilt shaft 6, and the belt connecting pin 20 is opposed to the spring 21 by the runner connecting hole 2.
6, the rearmost end runner 2 is first separated from the runner traveling endless belt 5 and stopped as shown in FIG.

When the next second runner 2 collides with the stopped first end runner 2 as shown in FIG. 13, the belt connecting pin operation projection 22 of the first end runner 2 is turned on. Since it enters the receptacle 23 of the second runner 2, the belt connecting pin 20 is similarly pulled out from the runner connecting hole 26, and the second runner 2 separates from the runner traveling endless belt 5 and stops.

Each time the runners 2 overlap one after another, such an operation is performed one by one, so that the louver group 4 is not provided from the front as in the conventional case, but from FIG.
As shown in FIG. 3, folding is performed sequentially from the rear (from the right end).

When the runner endless belt 5 is circulated from the folded state in the direction of arrow A in FIG.
The runner 2 with the belt connecting pin 20 protruding into the runner connecting hole 26 is pulled forward by the runner endless belt 5 and runs forward, and pulls the runner 2 at the rear through the connecting tongue piece 15. As the belt connecting pin operation projection 22 of the runner 2 which is one more rear is pulled out from the receiving port 23 of the runner 2 to be pulled, the belt connecting pin 20 of the runner 2 to be pulled is pulled out.
Can be projected again by the action of the spring 21 and enters the next runner connection hole 26 of the endless belt 5 for runner traveling. Then, the runner 2 is pulled by the runner traveling endless belt 5 and travels forward, and pulls the next runner 2 via the connecting tongue piece 15.

Such an operation is successively performed on the rear runner 2.
, The louver group 4 shifts from the state of FIG. 13 to FIGS. 12, 11, and 10, and the blinds are closed.

Next, a mechanism for reversing the direction of the louver 4 having an inverted S-shaped cross section one by one will be described.

At the upper end of the carrier 3 of each runner 2, as shown in FIGS. 5 and 6, a two-blade propeller 19 is provided.
It is fixed so as to rotate integrally with the carrier 3 and in a direction crossing the direction of the louver 4.

On the other hand, the louver reversing endless belt 7 on the rail 1 side is wound around sprocket wheels 30 and 31 which are supported at both ends of the rail 1 as shown in FIG.
By operating a louver inversion code (not shown) and rotating one (right side in the figure) sprocket wheel 31, the rail 1 circulates along the upper belt guide 8.

The direction of all the louvers 4 is set to a direction crossing the tilt shaft 6 as shown in FIG.
When all the runners 2 are moved forward as much as possible and then the tilt shaft 6 is rotated to make the direction of all the louvers 4 parallel to the tilt shaft 6 as shown in FIG. With such overlap, the blinds close completely. At this time, the propellers 19 of all the runners 2 cross the tilt shaft 6. In this state, the tilt shaft 6 is rotated to rotate all the louvers 4 simultaneously in a clockwise direction, and when all the louvers 4 are turned upside down (rotated by almost 180 degrees), the propellers 19 of all the runners 2 are also rotated as shown in FIG. The direction of rotation is approximately 180 degrees and the direction intersects with the tilt shaft 6. FIGS. 21A to 21C are schematic views showing such a reversing operation of the louver 4. FIG.

The louver reversing member 32 is fixed to the louver reversing endless belt 7 by projecting inward as shown in FIG. When the endless endless belt 7 is circulated, the louver reversing member 32 sequentially collides with the propeller 19 of the runner 2.

When the louver reversing member 32 collides with the propeller 19, the carrier 3 rotates. In this case, the worm 17 provided on the carrier 3 meshes with the worm gear 16 that rotates integrally with the tilt shaft 6 as described above, but the worm 17 slides (plays) between the worm 17 and the worm gear 16. If only one carrier 3 rotates, the tilt shaft 6 does not rotate because the load on the tilt shaft 6 is large, and the propeller 1
9, one carrier 3 colliding with the louver reversal member 32
Only the louver 4 rotates, and the direction of one louver 4 changes.

Therefore, when the louvers 4 are in a back-to-back state where the curves of the louvers 4 pass each other as shown in FIG. 18, the louver reversing endless belt 7 is circulated in the direction of arrow C,
The louver reversing member 32 is connected to the propeller 1 of the right end runner 2.
9 and the propeller 19 of the runner 2 on the left side one by one, the runner 2 hit by the louver reversal member 32 rotates the carrier 3 clockwise as shown in FIG. 19 and FIG. The louver 4 intersects with the tilt shaft 6. (4) and (5) of FIG.
This operation is schematically shown in FIG.

After all the louvers 4 are aligned in a direction intersecting with the tilt shaft 6 as shown in FIG. 22 (5), the tilt shaft 6 is rotated to move all the louvers 4 counterclockwise. When all the louvers 4 are simultaneously rotated, as shown in FIG. 22 (6), the louvers 4 are in an overlapping state in which the curves of the louvers are engaged with each other. In this case, all the louvers 4 are in a state where the state of FIG.

In order to restore the orientation of all the louvers 4 turned over in this way, the same operation as described above may be performed.

It is appropriate that the above-described reversal of the louver groups 4 can be performed one by one when the blinds are fully closed and the interval between the louvers 4 is maximized. Therefore, the top runner (the forefront runner) 2
Until t reaches the end (the left end in FIG. 4), the louver inverting endless belt 7 cannot be circulated,
The rotation of the left sprocket wheel 30 is restricted by the louver reversal restricting stopper mechanism 34 as shown in FIGS. 23 to 26, and the rotation is allowed after the top runner 2t reaches the end. Next, the louver reversal restricting stopper mechanism 34 will be described.

A stopper 35 is fixed inside the left end of the rail 1 (inside the rail side cap). A lever 36 is rotatably supported by the stopper 35 and is guided by the stopper 35. A louver reversal restricting stopper 37 which moves toward and away from the left sprocket wheel 30 is mounted. The lever 36 and the stopper 37 are connected by a pin, and the lever 36 is urged by a spring 38 so that a tooth portion 39 provided at the tip of the stopper 37 is usually provided as shown in FIGS. 23 and 24. It is designed to mesh with the sprocket wheel 30 on the left.

On the other hand, the top runner 2t has a bar-shaped stopper release member 40 protruding horizontally toward the front. When the top runner 2t reaches the end (left end), the stopper release member 40 is attached to the stopper base 35. The lower end of the lever 36 is pushed through the guide hole 41 provided, and is rotated against the spring 38. When the lever 36 rotates in this manner, the stopper 37
25, and the tooth portion 39 is separated from the left sprocket wheel 30 as shown in FIGS. 25 and 26, so that the rotation of the sprocket wheel 30 is permitted, that is, the circulation of the endless belt 7 for louver reversal is permitted.

Accordingly, when the blinds are closed until the top runner 2t reaches the end (left end), the louver inversion belt is operated to circulate the louver inversion belt 7, and the louver group 4 is sequentially oriented as described above. Can be inverted one by one.

Since the louver 4 has an inverted S-shaped cross section,
When opening the blind, as shown in FIG. 17, if the direction of the louver group 4 is parallel to the rail 1 and the louver 4 is moved backward while partly overlapping each other,
The movement cannot be performed smoothly. So, louver group 4
When the direction of the louver 4 is parallel to the rail 1 and the louvers 4 partially overlap each other, the top runner 2t is equipped with a runner restricting stopper mechanism 41 for restricting the running thereof in order to restrict the opening and closing operation of the blind. This is explained at last.

As shown in FIGS. 14 and 23, the rail 1
Is provided with a serrated portion 42 on the inner surface thereof. As shown in FIGS. 23 to 26, a stopper base plate 43 is fixed to the top runner 2t.
A runner restricting stopper 44 having a claw portion 44a is pivotally mounted by a pin 45 so as to be horizontally rotatable. The stopper 44 is urged by a spring 46 mounted on the stopper base plate 43 in a direction in which the claw portion 44 a does not engage with the sawtooth-shaped portion 42 of the rail 1. Further, only the carrier 3 of the top runner 2t has, in addition to the propeller 19, a smaller cam 47 (stopper operating member) fixed in the same direction as the propeller 19.

When the louver 4 is oriented so as to intersect the tilt shaft 6 as shown in FIGS. 4 and 16, the cam 47 does not push the stopper 44 as shown in FIG. 23. The spring 46 retracts to a position where it does not engage with the saw-toothed portion 42 of the rail 1. Therefore, in this case, the top runner 2t
Is permitted, so the blinds can be opened and closed.

However, when the louver 4 is in a direction parallel to the tilt shaft 6 as shown in FIG. 17, the cam 47 pushes the stopper 44 as shown in FIG.
Since a engages with the saw-toothed portion 42 of the rail 1, the traveling of the top runner 2t is restricted, and the blind cannot be opened and closed.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described structure. For example, as the runner connecting portion of the runner running endless belt 5, the hole (runner connecting hole 2) described above is used.
The present invention is not limited to 6), and may be a protrusion or a step that engages with the belt connecting pin 20.

[0049]

According to the present invention, when the blind is opened, the pulling of the louver groups is performed one after another from the end runner side to the front, contrary to the conventional method, so that the problem of damage to the runner and the drive shaft due to wear is eliminated. It can be eliminated and the appearance when the blind is opened halfway is improved.

According to the fifth aspect of the invention, the runner cannot run in the direction in which the louver is closed (the direction parallel to the axis of the rail), and is not opened (the direction intersecting with the axis of the rail). Therefore, even if the blind uses a louver having a cross section of an irregular shape such as an inverted S-shape, the blind can be opened and closed without any trouble.

[Brief description of the drawings]

FIG. 1 is a plan view showing a change in louver overlap when a blind having an inverted S-shaped cross section is turned upside down from a state (A) to a state (B).

FIG. 2 is a sectional view of a rail, a runner, and a belt in the embodiment of the present invention.

FIG. 3 is a schematic plan view showing a state in which a top runner is driven halfway in the embodiment of the present invention, and shows the louver separately from the runner.

FIG. 4 is a plan view similar to FIG. 3, showing a state in which a top runner has run to the end.

FIG. 5 is a perspective view of one runner.

FIG. 6 is a perspective view seen from the opposite direction to FIG. 5;

FIG. 7 is a cross-sectional view of one runner.

8 is a cross-sectional view of a portion different from FIG.

FIG. 9 is a cross-sectional view of a state where the belt connecting pin is retracted from the state of FIG. 9;

FIG. 10 is a partial plan view showing that runner groups are sequentially moved backward to open a brand.

FIG. 11 is a plan view showing a state in which it is moved backward from FIG.

FIG. 12 is a plan view showing a state where it is moved backward from FIG. 11;

FIG. 13 is a plan view showing a state in which two runners are further overlapped by running backward.

FIG. 14 is a cutaway perspective view of a rail.

FIG. 15 is a partial perspective view of an endless belt for runner traveling and an endless belt for louver reversal.

FIG. 16 is a schematic plan view in which the top runner is driven to the end and the direction of the louver is set to intersect with the tilt shaft.

FIG. 17 is a schematic plan view in which the top runner is run to the end and all louvers are oriented parallel to the tilt shaft.

FIG. 18 is a schematic plan view in which the directions of all louvers are reversed from the state of FIG. 17;

19 is a schematic plan view showing a state where the direction of the louvers is changed one by one from the state of FIG. 18;

FIG. 20 is a plan view of a part of a similar state.

FIG. 21 is a schematic diagram showing a transition state when all louvers are simultaneously changed in direction.

FIG. 22 is a schematic diagram showing a transition state when the direction of the louvers is changed one by one.

FIG. 23 is a schematic plan view of a louver inversion restricting stopper mechanism and a runner restricting stopper mechanism.

FIG. 24 is a schematic front view of the above.

FIG. 25 is a schematic plan view showing an operating state of a louver inversion regulating stopper mechanism and a runner regulating stopper mechanism.

FIG. 26 is a schematic front view of the above.

[Explanation of symbols]

 Reference Signs List 1 rail 2 runner 2t top runner 3 carrier 4 louver 5 endless belt for runner traveling 6 tilt shaft 7 endless belt for louver reversal 8 belt guide 9 runner guide 10 belt guide 11 convex part 12 carrier rotating mechanism chamber 13 Mechanism chamber 14 connecting recess 14a protrusion 15 connecting tongue 16 worm gear 17 worm 18 pinion 18a cam 19 propeller 20 belt connecting pin 20a rack 21 spring 22 belt connecting pin operating protrusion 23 receptacle 24/25 sprocket wheel 26 runner connecting hole ( (Runner connecting portion) 28 end stopper 30/31 sprocket wheel 32 louver reversing member 34 louver reversing restricting stopper mechanism 35 stopper base 36 lever 37 louver reversing Control stopper 38 spring 39 teeth 40 stopper release member 41 runner restricting stopper mechanism 42 serrations 43 stop base plate 44 runner restricting stopper 44a pawl portion 45 pin 46 spring 47 cam (stopper operating member)

Claims (5)

(57) [Claims] 1. A blind in which a louver is hung on a group of runners running along rails, wherein runner connecting portions are provided at regular intervals on a runner running endless belt that can circulate along the rails. To
A belt connecting pin capable of moving back and forth between a position engaged with the runner connecting portion and a retracted position not engaged with the spring, and a spring for urging the belt connecting pin to a position engaging with the runner connecting portion; A belt connecting pin actuation is provided in which a receiving port is provided on the rear surface, and when a runner in front is overlapped with the front of each runner, the runner enters the receiving port and retracts the belt connecting pin to the retracted position against the spring. A blind opening and closing device characterized by having projections. 2. The blind opening / closing device according to claim 1, wherein the runner connecting portion of the endless belt for running the runner is a hole. 3. A pinion which is rotatable around a tilt shaft for simultaneously changing the direction of a louver group inside each runner, and which engages with a belt connecting pin operating projection which is inserted from a receiving port. 3. The blind opening and closing device according to claim 1, wherein a cam for rotating the pinion is provided, and a rack portion that meshes with the pinion is provided on the belt connecting pin. 4. 4. An end stopper is fixed to one end of the rail, and a belt connecting pin operating projection is provided on the end stopper for projecting into a receiving port of the end runner to retract the belt connecting pin. A blind opening / closing device according to claim 1, 2 or 3. 5. A top runner is provided with a runner restricting stopper capable of restricting the travel of the top runner with respect to the rail and releasing the same, and when the louver is in the closing direction, the top runner is operated to the runner restricting stopper to the traveling restricting position. The blind opening / closing device according to claim 1, 2, 3, or 4, further comprising a stopper operating member that returns to the release position when the door is opened.