JPH11270256A - Support structure for windup shaft of sheet shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To disperse and lighten load working on a sheet at points where a support roller comes into contact with a windup shaft and to improve therewith durability for the sheet by a method wherein the support roller in a diameter the same with or larger than the windup shaft is arranged under the windup shaft, extending almost all over the length of the windup shaft, and the windup shaft is mounted on the support roller. SOLUTION: A support roller 4 is provided under a windup shaft 3, extending almost all over the length of the windup shaft, with its center of axis positioned slightly eccentric toward the front side of the center of axis of the windup shaft 3, and is made rotative, and the diameter of the support roller 4 is made the same with or larger than the diameter of the windup shaft 3. Since points of contact between the windup shaft 3 and the support roller 4 are continuous, load working on a sheet 1 can be dispersed and lightened, and the windup shaft 3 can be placed stably on the support roller 4. On unwinding the sheet 1, a torque is applied only to the front side circular arc of the support roller 4, namely to one fourth of the circular arc on the upper left of the circle, and therefore the sheet 1 can be unwound stably still more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet shutter.
(Preferably a fire sheet shutter that defines a large opening)
More specifically, the structure is applied to a sheet wound around the winding shaft at a contact point between the winding shaft and a support roller on which the winding shaft is mounted. The present invention relates to a winding shaft support structure capable of improving the durability of a sheet by dispersing and relaxing a load.

[0002]

2. Description of the Related Art A sheet shutter for opening and closing an opening by feeding and winding a sheet wound around a winding shaft.
In particular, when the winding shaft is used for a large opening, there is a problem in that the winding length of the winding shaft is long, the deflection due to the sheet weight and the weight of the winding shaft is large, and normal winding cannot be performed. Therefore, Japanese Utility Model No. 3-36370 or Japanese Utility Model No. 3-18
As disclosed in Japanese Patent No. 8859, there has been proposed a method of supporting a take-up shaft below the take-up shaft with a plurality of support rollers provided at predetermined intervals in a longitudinal direction thereof. I have. Incidentally, the support roller is usually attached to a shutter case or a support arm taken out of the building structure.

However, in the above-mentioned proposal, the winding shaft is provided with a certain bending strength, and the insufficient strength is intended to be supplementarily supported by a pair of supporting rollers.
La is a small diameter and a short one is merely provided discretely at predetermined intervals in the length direction of the winding shaft,
The take-up shaft is made of steel pipe of a considerable diameter in order to have a certain strength and is heavy, and a large load is locally applied to the sheet where the support roller and the take-up shaft abut. There were fears of wrinkling, breakage of sheet fibers, scratches and perforations. In addition, there was a fear that the sheet might become loose between the supporting rollers.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problem, and has a function of dispersing and reducing a load acting on a sheet at a position where a supporting roller and a winding shaft come into contact with each other. And to improve the durability of the sheet.

[0005]

The technical means adopted by the present invention to solve the above-mentioned problems is that a sheet wound around a winding shaft is installed above a building opening and fed out. In a sheet shutter for opening and closing the opening, a support roller having the same diameter or a large diameter as that of the winding shaft is provided over substantially the entire length below the winding shaft, and the winding shaft is supported by the supporting roller. It is characterized by being placed on a roller. Since the diameter of the supporting roller is the same as or larger than the diameter of the winding shaft, the winding shaft can be stably mounted even on one supporting roller. In addition, by providing the support roller over substantially the entire length below the take-up shaft, the contact point between the support roller and the take-up shaft is continuous, so that the load on the sheet can be reduced. Can be.

Preferably, the support roller can be divided into two or more parts. By providing the support roller divided into two or more in the length direction, the deflection in the length direction becomes extremely small. Is reduced to 1/8), the support roller is maintained in a more horizontal state, and the winding shaft mounted on the support roller contacts the support roller more uniformly, and −
The load on the load is further reduced.

[0007] Preferably, a support cover is provided between the ends of the divided support rollers, and the divided support rollers and the support cover support the winding shaft continuously. Is good. By doing so, the winding shaft can be placed continuously without any gap, and the load on the sheet can be further reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. Figure 1 shows the shutter cage
2 is an overall front view of a sheet shutter without a shutter, FIG. 2 is an enlarged sectional view of a driving unit, and FIG. 3 is an enlarged front view of the driving unit. , A winding shaft 3 rotatably supported by the bracket 12, a sheet 1 wound around the winding shaft 3, and the sheet 1 A seat plate 2 provided at the lower end of the seat 1, a switch 13 for driving the winding shaft in the forward and reverse directions, and guide rails 11 erected at the left and right ends of the opening to guide the left and right ends of the sheet 1. The opening is opened and closed by taking out and feeding the sheet 1 by forward / reverse drive of the switch 13, and in the event of a fire, the brake device incorporated in the switch 13 is released by a signal from a fire alarm (not shown). The opening is closed by lowering the sheet 1, and the fire spreads. Intended to prevent diffusion of the smoke, it is of known both. The sheet 1 is made of a heat-resistant silica cloth, and the shutter case 20 has a function of providing a winding shaft and the like as well as a space inside the ceiling for fire protection.

FIG. 4 is a sectional view showing an intermediate bracket portion.
FIG. 5 is a front view of the fitting, and FIG. 6 is a sectional view of the fitting of the auxiliary roller mounting portion. Below the winding shaft 3, a support roller 4 is provided over substantially the entire length thereof. The support roller 4 is divided into two parts in the longitudinal direction by the brackets 12, 12 and an intermediate bracket 7 provided at the center of the opening width. In the embodiment, the support roller 4
In the sectional view, the axial position of the support roller 4 is slightly forward of the axial position of the winding shaft 3 (the left side of the winding shaft 3 in FIG. The right side is the front side, and the right side is the rear side.). The support roller 4 comprises a roller body 4a made of steel pipe and shaft necks 4b at both ends. One end of the support roller 4 is turned to the intermediate bracket 7 via the bearing 9, and the other end is turned to the bracket 12 via the bearing 9. It is pivotally supported.

In order to satisfactorily mount the winding shaft 3 on the one supporting roller 4, the supporting roller 4 only needs to have at least the same diameter as the winding shaft 3. Considering the case where the shaft center is deviated from the shaft center of the support roller 4, the diameter of the support roller 4 is set to the maximum outside diameter of the winding shaft (the maximum winding diameter of the winding shaft). Outer diameter including sheet)
Preferably, the diameter has a larger dimension. Further, the support roller 4 is not limited to the one divided into two as shown, but may be one (a support roller having substantially the same length as the winding shaft 3), or three or more. It may be divided. In addition, although the left and right ends of the opening are supported using the common bracket 12 with the winding shaft, they may be separate brackets.

Next, the winding shaft 3, the support roller 4, and the seal
The relationship of the winding direction of the g 1 will be described with reference to FIG. The sheet 1 is wound clockwise around the winding shaft 3, the lower end of the sheet passes between the winding shaft 3 and the support roller 4, and further, a front circular arc portion (circle) of the support roller 4. Along the upper left (about a 1/4 arc portion) and is connected to the seat plate 2. In FIG. 6, since the axis of the winding shaft 3 is offset to the left by Y from the axis of the support roller 4,
A force is exerted on the winding shaft 3 to slide down in the direction of arrow B along the circular arc surface of the support roller 4, but on the other hand, the shear
Since the sheet 1 is always descending by its own weight and the weight of the seat plate, the winding shaft 3 is simultaneously attached with the arrow A by the sheet 1.
The pulling force works in the direction, and the balance is taken as a whole.

FIG. 8 shows another embodiment showing the relationship between the winding shaft 3, the supporting rollers 4, and the winding direction of the sheet 1. In FIG. In this configuration, when the take-up shaft 3 rotates in the direction of arrow B, a rotational force acts on the support roller 4 in the direction of arrow B ′ on the contact surface with the take-up shaft 3, and the unrolled shaft is used. On the abutment surface with the gate 1, a rotational force acts in the direction of arrow A opposite to the direction of arrow B ′. In this regard, FIG.
In the embodiment shown in FIG. 6, since the rotational force applied to the support roller 4 when the sheet 1 is extended is only in the direction of arrow A,
As compared with the one shown in FIG. 8, the sheet 1 is more stably fed out. Further, by providing a front auxiliary roller 5 and a rear auxiliary roller 6, which will be described later, so as to sandwich the winding shaft 3 from front and rear, for example, a sheet shutter.
The take-up shaft 3 is supported by the support roller 4 even when the take-up shaft 3
It can be stably mounted on the top.

Next, a structure in which the take-up shaft 3 is kept horizontal so that the sheet 1 can be taken out and fed will be described in the case where the support roller 4 is divided. In contrast to the conventional structure in which the winding shaft has a certain bending strength and the insufficient strength is compensated for by a small supporting roller, the present invention provides the supporting roller 4 with a sufficient bending strength. And the take-up shaft 3 is placed thereon. Therefore, the winding shaft 3 does not need to have a bending strength, and only needs to have a diameter necessary for winding the sheet 1. In addition, since the support roller 4 is configured to be divided and arranged,
For example, even if it is divided into two, the bending strength is eight times and the bending amount is 1/8, so that the required strength can be easily secured. The bending strength of the sheet winding mechanism is not a winding shaft (the whole opening width must be constituted by one shaft because the sheet is wound), but a dividable support roller.
The diameter of both the take-up shaft 3 and the support roller 4 is reduced by adopting a structure in which the roller is supported by a roller (since the sheet is not wound on the support roller and can be divided). Can be. Also, the reduction in the diameter of the winding shaft 3 reduces the weight, so that the load on the sheet 1 at the place where the support roller 4 and the winding shaft 3 come into contact can be further reduced.

Next, the structure of the intermediate bracket 7 will be described. As shown in FIG.
Is a pair of crab-shaped shaft mounting plates 7b, 7 protruding from the center of the lower portion of the hanging plate portion 7a and having an inverted L-shape in cross section.
b and an inverted L-shaped connecting plate 7c for connecting the portions b to each other. The intermediate bracket 7 is fixedly welded to the structural body 100 via the mounting member 110.
Here, since the height of the shaft mounting plate 7b is set to be equal to or less than the outer diameter of the support roller 4, an extra height for the pedestal fitting like a conventional small support roller is used. Is not necessary, which is convenient in considering the height of the fitting. Note that the mounting member 110 is for appropriately processing and mounting a steel material such as an equilateral angle steel at the site, and various shapes and the like are adopted.

A support cover 8 made of resin and having a J-shaped cross section and substantially the same width as the intermediate bracket 7 overlaps the flat portion on the connecting plate 7c, and the arc-shaped tip portion is mounted on the intermediate bracket 7. It is attached so as to cover the plate 7b. By providing the support cover 8 between the ends of the divided support rollers 4, the winding shaft 3 is continuously supported by the support roller 4 and the support cover 8 without any gap. Thus, the load acting on the sheet can be further dispersed and reduced. The distal end of the support cover 8 has an arc of about 120 degrees, and its outer shape is formed in an arc substantially the same size as or slightly smaller than the outer diameter of the support roller 4. The sheet 1 is satisfactorily guided at the time of feeding and winding.

The above-mentioned front auxiliary roller 5 and rear auxiliary roller 6
Will be described. The front and rear auxiliary rollers 5 and 6 are provided so as to oppose each other so as to sandwich the winding shaft 3 from the front and rear, and a plurality of the auxiliary rollers are arranged at appropriate intervals in the length direction of the winding shaft. The front auxiliary roller 5 and the rear auxiliary roller 6 are composed of a short roller and a U-shaped pedestal fitting for rotatably supporting the roller. The rear auxiliary roller 6 is provided at a position slightly below the horizontal position of the take-up shaft and slightly away from the maximum outer diameter of the take-up shaft. The front and rear auxiliary rollers 5 and 6 are provided at appropriate intervals in the longitudinal direction of the winding shaft 3 and have a substantially U-shaped cross section, open downward and surround the winding shaft 3. Attached to the auxiliary roller support plate 50 provided. Auxiliary row
The support plate 50 is welded and fixed to the structural body 100 at an appropriate position via an attachment member. Front auxiliary roller 5
Is detachably screwed to the auxiliary roller support plate 50 via the front support base 51. When installing this device,
The take-up shaft 3 is mounted with the front auxiliary roller 5 and the front support base 51 removed.

A method of connecting the intermediate bracket 7 (or the bracket) and the support roller 4 is as follows. For example, as shown in FIG.
The structure in which the bearings are built into the support rollers, and the structure in which the gap between the support rollers is further reduced may be adopted. Also,
Like the support roller 4, the front auxiliary roller 5 and the rear auxiliary roller 6 may be arranged over substantially the entire length of the winding shaft 3, and the diameter of the front auxiliary roller 5 and the rear auxiliary roller 6 is the same as that of the support roller. The diameter may be selected.

[0018]

According to the first aspect of the present invention, the support roller is provided.
By providing the roller over the entire length below the winding shaft,
The contact point between the winding shaft and the support roller becomes continuous, and the load on the sheet can be dispersed and reduced. Since the diameter of the supporting roller is the same as or larger than the diameter of the winding shaft, the winding shaft can be stably mounted even on one supporting roller.

According to the second aspect of the present invention, by providing the support roller divided into two or more parts, the bending in the length direction of the support roller becomes extremely small (the total length is divided by 1/1/2). When it becomes 2, the bending strength becomes 8 times and the bending amount becomes 1/8), and the supporting roller is maintained in a more horizontal state, and is placed on the supporting roller and the supporting roller. The load on the sheet is further alleviated by contact with the winding shaft more uniformly.

According to the third aspect of the present invention, a support cover is provided between the ends of the divided support rollers so as to cover the support portions at the ends, and the divided support rollers and the divided support rollers are provided. Since the take-up shaft is continuously supported by the support cover, the take-up shaft can be placed continuously without any gap, and the load on the sheet can be further reduced.

[Brief description of the drawings]

FIG. 1 is a sheet shutter in which a shutter case is omitted.
FIG.

FIG. 2 is a sectional view of a driving unit.

FIG. 3 is an enlarged front view of a driving unit.

FIG. 4 is a sectional view showing an intermediate bracket portion.

FIG. 5 is a front view of the fitting.

FIG. 6 is a sectional view in which an auxiliary roller mounting portion is accommodated.

FIG. 7A is an overall perspective view of an intermediate bracket. (B) The whole perspective view of a support cover.

FIG. 8 is an explanatory diagram of a sheet winding direction and rotation of a support roller.

FIG. 9 shows another example of a method of connecting the intermediate bracket and the support roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet 3 Winding shaft 4 Support roller 5 Front auxiliary roller 6 Rear auxiliary roller 7 Intermediate bracket 8 Support cover

Claims (3)

[Claims] A sheet shutter which is installed above a building opening and which opens and closes the opening by winding up a sheet wound around a winding shaft, wherein the sheet shutter has the same diameter as that of the winding shaft. A large-diameter support roller is disposed over substantially the entire length below the take-up shaft, and the take-up shaft is mounted on the support roller. Shaft support structure. 2. A support structure for a winding shaft of a sheet shutter according to claim 1, wherein the support roller is divided into two or more parts. 3. A support roller according to claim 2, wherein a support cover is provided between the ends of the divided support rollers so as to cover the support portions at the ends, and the divided support rollers and the support covers are provided. And a supporting structure for supporting the take-up shaft of the sheet shutter.