JPH078786Y2 - Moving structure of the shutter winding shaft - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is designed so that the winding shaft automatically moves according to the outer winding diameter of the winding foil that changes with the vertical movement of the shutter curtain. The present invention relates to a moving structure of a shutter winding shaft.

[Problems to be Solved by Prior Art and Invention] In general, the outer winding diameter of the winding foil changes according to the amount of winding of the shutter curtain when winding and unwinding the shutter curtain. It will be. However, conventionally, the winding shaft (axial core) of the shutter is fixed to the body side. Therefore, during opening and closing, the feeding direction of the shutter curtain from the winding shaft to the guide part at the upper end of the guide rail changes, especially when the shutter curtain is close to the closed state with a small winding diameter. And as a result,
There were many problems such as violent noise, scratches on the slat, peeling of the coating film, and early wear of the sound deadening member, which also caused premature rust of the shutter curtain and shortened life.
Therefore, as shown in Japanese Utility Model Publication Nos. 47-11402 and 48-11005, there is proposed one in which the axis of the winding wheel moves, but these are complicated in mechanism and are difficult to implement. However, there is a problem that it is difficult to manufacture parts and members and adjust the operation while supporting the load of the shutter curtain. There is a fear that it will move to the moving end, so it cannot be adopted immediately.

[Means for Solving the Problems] The present invention was devised with the object of providing a moving structure of a shutter winding shaft capable of eliminating these drawbacks in view of the above circumstances. To suspend the bearing plate swingably through a pair of links whose upper ends are pivotally supported on the frame side, the links are narrower between the bearing plate side pivot parts than between the upper body frame side pivot parts. It is characterized in that it is provided so as to spread upward.

The present invention is such that the winding shaft automatically moves back and forth according to the winding amount of the shutter.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, 1 is a shutter curtain, 2 is a storage case, 21 is a side bracket of the storage case, 22 and 23 are inner and outer guide portions provided at the swallowing opening of the shutter curtain 1, 3
Is a winding shaft, 4 is a plurality of winding wheels for winding the shutter curtain 1, the wheels 4 are rotatably mounted on the winding shaft 3 and connected to each other by stays 5, One end of the ammunition machine 6 mounted on the winding shaft 3 is fixed to the winding shaft 3 and the other end is fixed to the wheel 4 so that the shutter curtain 1 is always urged upward. It is conventional that the opening is opened and closed by winding and rewinding on the foil 4, but in the present invention, the conventional fixed winding shaft 3 is made movable. It is a thing. In the figure, 9 is a building frame, 10 is a guide rail, 41 is a maximum winding diameter, and 42 is a minimum winding diameter.

That is, both ends of the winding shaft 3 are supported by the bearing plate 7 via the bearings 71. 8a and 8b are a pair of links,
The upper ends of 8a and 8b are pivotally supported by a pin 81 swingably on a bracket 21 fixed to the body 9 side, and the lower ends thereof are the bearing plate 7 described above.
It is pivotally supported by a pin 82 so that it can swing. Link here 8
L between the abutments of the a and 8b on the side of the body 9 (distance between pins 81)
1 between the bearing plate side pivots (distance between pins 82), wheel 4
These relations are set so that L>D> l, where D is the diameter of. With respect to these dimensional settings, the larger the dimensional difference between L and l, the larger the movement amount of the bearing plate 7, and the smaller the dimensional difference, the smaller the movement amount. The shaft is fixed. On the contrary, when L <l, the bearing plate 7 is moved in the right direction, which is completely opposite to the above case.
Is to move. As described above, the winding shaft 3 supported by the bearing plate 7 is connected to the frame 9 via the pair of links 8a and 8b.
It will be swingably hung on the (bracket 21) side.

In the embodiment of the present invention constructed as described above, first,
How the bearing plate 7 moves due to the balance of forces will be described with reference to an operation explanatory diagram. In the figure, 30 is the center of the winding shaft 3, W ₁ is the weight of the shutter curtain 1 in the unwound portion, W ₂ is the portion of the shutter curtain 1 wound around the foil 4, the winding shaft 3, and the bullet. The total weight of the machine 6, foil 4, etc.,
M is the unbalance moment of the ammunition 6, and when the unbalance moment M> 0, the shutter curtain goes up, and when the unbalance moment M <0, it goes down. Further, assuming that F ₁ and F ₂ are fulcrum loads at the positions of the left and right pins 82 respectively, and R is a distance to the shaft center 30 where the load of the W ₁ portion of the shutter curtain 1 is an acting point, Also Here, when the shutter curtain is fully opened, the winding diameter of the foil 4 is maximum, and R · W ₁ ≈M, that is, F ₁ ≈F ₂ , and at this time, as shown in FIG. 8b is a symmetrical position on the left and right, and the winding shaft 3 is set substantially at the center of the storage case 2.

Also, when the shutter curtain is fully closed, W ₁ is the maximum value,
W ₂ has the minimum value, and the difference between F ₁ and F ₂ has the maximum value. Here, F ₁ is always F ₁ > 0, but F ₂ may have a negative value.

Now, when F ₂ <0 when fully closed (see FIGS. 5 (a) and 5 (b)), the forces F ₁ and F ₂ acting on the pin 82 cause the links 8a and 8b to act on the pin 81 respectively. This gives a moment to rotate the bearing plate 7, which causes the bearing plate 7 to move to the left as shown in FIG.
When the link 8a is moved to, the direction of the moment of the link 8a is reversed, and the left and right links 8a and 8b and the acting forces F ₁ and F ₂ are balanced. Further, when the acting force is F ₂ = 0, the bearing plate 7 is moved leftward from the position shown in FIG. 6 (a) to the position shown in FIG. 6 (b) where the link 8a is vertical.

As described above, according to the present invention, the left and right bearing plates 7 are swingably suspended by the pair of links 8a and 8b, respectively, but the imbalance of the acting force on the bearing plates 7 is unbalanced. If it occurs, the links 8a and 8b are immediately pivoted to move the bearing plate 7, and if the winding diameter of the shutter curtain 1 becomes small, the winding shaft will respond accordingly. The core moves to the guide portion 22 side, and the shutter curtain 1 always passes through the central portions of the inner and outer guide portions 22 and 23 and descends. On the other hand, at the time of winding, the bearing plate 7 is gradually returned to move away from the guide portion 22, so that the shutter curtain 1 can always pass through the central portions of the inner and outer guide portions 22 and 23. As a result, the collision with the inner and outer guide portions 22, 23 can be reduced, and the bearing plate side pivotal support portions (distance between the pins 82) l dimension so that the bearing plate 7 does not protrude outward from the winding wheel 4. Is set to be smaller than the diameter D of the winding foil 4, so that when the shutter curtain 1 is wound and unwound, it does not come into contact with the bearing plate 7 and become a hindrance, and a quiet opening / closing operation is possible. In addition, the life of the shutter curtain can be extended.

[Effects] In summary, since the present invention is constructed as described above, a balanced moment effect is obtained by swingably suspending the left and right bearing plates on a pair of links that are expanded upward. Therefore, when the shutter curtain descends, the take-up shaft moves, and it is possible to maintain the feeding direction of the shutter curtain so as to always face directly under the guide portion. It is possible to reduce the opening and closing time, and it is possible to open and close quietly, and the life of the shutter curtain can be extended.

[Brief description of drawings]

The drawings show an embodiment of the moving structure of the shutter winding shaft according to the present invention. FIG. 1 is a schematic front view of the shutter, FIG. 2 and FIG. 3 are side views of a bearing plate, and FIG. 4, 5 (a), 5 (b), 6 (a), and 6 (b) are explanatory views of the action of the bearing plate, and FIG. 7 is a side view of the winding wheel of the conventional shutter. In the figure, 1 is a shutter curtain, 3 is a winding shaft, 4 is a foil, 7 is a bearing plate, 8a and 8b are links, 81 and 82 are pins, 21 is a side bracket, 22 and 23 are inner and outer guide parts, 9 is a skeleton.

Claims (1)

[Scope of utility model registration request] 1. A bearing plate is oscillatably suspended via a pair of links whose upper ends are pivotally supported on the body side, and the two links are located closer to the bearing plate than between the upper body-side pivotal support portions. A moving structure for a shutter winding shaft, characterized in that it is provided in an upwardly expanded shape so that the space between the pivotal support portions becomes narrow.