JPH09160130A - Projection screen device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly perform the developing operation and the taking-up operation of a projection screen and to prevent the projection screen from being wrinkled. SOLUTION: This device is constituted of a take-up pipe 2 for taking up the projection screen 1, right and left supporting shafts 3 turnably supporting both ends of the pipe 2, and right and left holding devices 4 keeping the pipe 2 in a horizontal state by holding the respective supporting shafts 3 on a set surface B. Each holding device 4 is equipped with two holding tools 29 and 25 holding the supporting shaft 3 at two spots, and the holding tool 25 at an inside position holds the supporting shaft 3 at a higher position than the holding tool 24 at an outside position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection curtain device provided in various facilities such as schools and theaters, and in particular, the present invention uses a long pipe as a winding pipe for winding a projection curtain. Related projection screen device.

[0002]

2. Description of the Related Art Conventional projection screen devices of that type are installed on the floor or the like to set a projection screen at a predetermined place, or installed on a moving vehicle or the like and projected at any place. There is a movable type that stretches the curtain. In either system, a long take-up pipe that winds the projection screen, left and right support shafts that support both ends of the take-up pipe in a freely rotatable manner, and each support shaft are held on the installation surface. And left and right holders for horizontally setting the winding pipe. A wire is connected to the upper end of the projection screen, and the projection screen is stretched by winding the wire upward by a winding device.

[0003]

However, in the case of this type of projection screen device, since the take-up pipe is as long as 10 meters, the take-up pipe and the projection screen are centered by the load of the take-up pipe and the projection screen. The part deforms so that it hangs down. Due to this deformation, when the wire is wound up, the winding pipe does not pivot smoothly due to the core swaying, which hinders the delivery of the projection screen, which requires time and labor to stretch the projection screen. Further, when the projection screen is stretched, there is a problem that the projection screen is wrinkled due to the deformation and the image on the projection screen is distorted. Also, when the stretched projection curtain is wound on the take-up pipe, the take-up pipe does not rotate smoothly, which hinders the take-up of the projection screen, and the time and effort required for the take-up work of the projection screen. Requires.

The present invention has been made in view of the above problems. By devising a method of supporting the take-up pipe so as to suppress the deformation of the take-up pipe, the work for tensioning and taking up the projection screen is performed. It is an object of the present invention to provide a projection screen device that smoothes the screen and prevents wrinkling of the projection screen.

[0005]

SUMMARY OF THE INVENTION A projection screen device according to the present invention includes a take-up pipe for winding a projection screen, left and right support shafts for rotatably supporting both ends of the take-up pipe, and respective support shafts. And a holding device for holding the take-up pipe in a horizontal state by holding the take-up pipe on the installation surface. Each holding device
Two holders for holding the support shaft at two positions are provided, and the holder in the inner position holds the support shaft at a higher position than the holder in the outer position.

[0006]

Operation: The left and right support shafts are stably supported by the two holders, respectively, and the holding metal fitting at the inner position holds the support shaft at a higher position than the holding metal fitting at the outer position. Both ends are supported so as to be pushed diagonally upward. Therefore, the central portion of the take-up pipe is prevented from hanging down, the take-up pipe pivots smoothly, and the projection screen can be stretched and taken up easily. In addition, the wrinkle of the projection screen is prevented when the cable is stretched.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the overall construction of a projection screen apparatus according to an embodiment of the present invention. Although the projection screen apparatus of the illustrated example is an installation type in which the projection screen 1 is stretched at a predetermined place such as a stage, the present invention is not limited to this, and the projection screen device may be mounted on a moving vehicle or the like at any place. It can also be applied to a mobile type with a projection screen installed.

This projection screen apparatus includes a winding pipe 2 for winding the projection screen 1, left and right support shafts 3 and 3 for rotatably supporting both ends of the winding pipe 2, and support shafts 3. It is provided with left and right holding devices 4 and 4 for holding the winding pipe 2 in a horizontal state by holding it on the installation surface B. In this embodiment, the installation surface B is the bottom surface of the concave portion C provided on the floor surface A as shown in FIG. 2, and the lid plate D covers the upper opening of the concave portion C when not in use. .

The projection screen 1 has a white cloth 6 on the front surface of the base cloth 5.
And the edge bar 7 is attached to the upper edge of the base cloth 5. The edge bar 7 is connected to a hoisting device (not shown) via a hanging mechanism 8. As shown in FIG. 3, the suspending mechanism 8 includes a support rod 9 to which a wire (not shown) of a hoisting device is connected, and a plurality of suspending tools 10 that are suspended in appropriate places on the support rod 9. , The projection screen 1
It is composed of a plurality of hooks 11 attached to the edge bar 7 corresponding to each hanging tool 10.

Each hanging tool 10 has a fitting 12 mounted on the support rod 9 at the upper end and a connecting ring 13 at the lower end, which is connected to the hooking tool 11, and has a screw shaft 1 at the middle part.
There is provided a length adjusting mechanism 16 capable of changing the length of the hanging tool 10 in accordance with the meshing position of the nut 4 and the nut 15. Each of the hooks 11 has a fitting 17 attached to the edge bar 7 of the projection screen 1 at the lower end, and a hook 18 detachable from the connecting ring 13 of the hanging tool 10 at the upper end. A projecting piece 19 having a locking hole 20 is integrally formed with the mounting member 17. As shown in FIG. 2, the projecting piece 19 is locked by a stopper E provided on the side wall of the recess C when the projection screen 1 is wound up.

The take-up pipe 2 is composed of a lightweight metal pipe such as aluminum. Winding pipe 2
As shown in FIG. 4, a pair of bearing plates 21,
22 is fitted in the pipe inner hole. Each bearing plate 21,2
A support shaft 3 is pivotally supported by 2, and both ends of the winding pipe 2 are rotatably supported by the left and right support shafts 3. A return spring 23 for urging the winding pipe 2 in the winding direction is interposed between the support shaft 3 and the winding pipe 2 at both ends of the winding pipe 2. The projection screen 1 is wound around the outer peripheral surface of the winding pipe 2 by the spring force.

As shown in FIGS. 4 and 5, each of the left and right holding devices 4 is composed of two holders 24 and 25 for holding the support shaft 3 at two places. The outer holder 24 holds the end portion of the support shaft 3, and the inner holder 25 holds the center portion of the length of the support shaft 3. Each of the holders 24 and 25 in the illustrated example includes an L-shaped metal plate 26 and a rectangular holding plate 27. Each metal plate 26 integrally includes a horizontal plate portion 28 fixed to the installation surface B by an anchor bolt 35 and a vertical plate portion 29 holding the support shaft 3.

FIG. 6 shows the structure of the vertical plate portion 29 of the holder 24 at the outer position. The illustrated vertical plate portion 29 has a trapezoidal shape, and the holding groove 30 of the support shaft 3 is formed by notching the central portion of the upper end edge in a U shape. This holding groove 3
In 0, the groove width is set smaller than the diameter of the support shaft 3,
By engaging the engagement surfaces 34, 34 formed by chamfering the diagonal positions of the outer peripheral surface of the support shaft 3 with the groove side edges of the holding groove 30, the support shaft 3 is held non-rotatably.

Bolt insertion holes 31, 31 are formed on both sides of the holding groove 30 of the vertical plate portion 29 so as to correspond to the mounting position of the pressing plate 27. These bolt insertion holes 3
A bolt 32 for attaching the pressing plate 27 is inserted into the terminals 1 and 31. The pressing plate 27 is pressed against the support shaft 3 engaged in the holding groove 30, and both ends of the pressing plate 27 are fixed by the bolts 32 and the nuts 33.
The supporting shaft 3 and the installation surface B are held at a predetermined height h1. The holding groove 30 may be configured such that the groove depth is set deep and the height h1 for holding the support shaft 3 can be freely adjusted, as shown by a chain line in the drawing. In this case, the bolt insertion hole 31 is formed as a long hole that is long in the vertical direction.

FIG. 7 shows the construction of the vertical plate portion 29 of the holder 25 at the inner position. This vertical plate portion 29 also has a trapezoidal shape, and by cutting out the central portion of the upper end edge in a U shape,
The holding groove 30 of the support shaft 3 is formed. This holding groove 30
Has a groove width set to be the same as the diameter of the support shaft 3, the pressing plate 27 is pressed against the support shaft 3 engaged in the holding groove 30, and both ends of the pressing plate 27 are fixed to the bolt 32 and the nut. Three
The support shaft 3 is held at a predetermined height h2 on the installation surface B by being fixed at 3. The holding height h2 of the support shaft 3 by the holder 25 at the inner position is set to be larger than the holding height h1 of the support shaft 3 by the holder 24 at the outer position,
Therefore, the holder 25 in the inner position is different from the holder 24 in the outer position.
The supporting shaft 3 is held at a higher position. FIG. 7
Inside, 31 is a bolt insertion hole 31, through which the bolt 32 is inserted,
31.

FIG. 8 shows a mobile vehicle 40 in which a projection screen device is mounted. This moving vehicle 40 has a structure in which a plurality of free wheels 43 are attached to the lower surface of a box-shaped case 42 having a removable lid plate 41, and the projection screen device is housed inside the box-shaped case 42. Installation surface B on the bottom plate
Installed in

When the projection screen device having the above-mentioned structure is not used, as shown in FIG. 2, the projection screen 1 is housed in the recess C and the cover plate D is wound around the outer peripheral surface of the winding pipe 2. Is covered. At the time of use, the cover plate D is opened, the hanging tool 10 is connected to each of the hooking tools 11 mounted on the projection screen 1, and the wire of the hoisting device is connected to the support rod 9, and then the wire is hoisted upward. . As a result, the take-up pipe 2 supported by the left and right support shafts 3 rotates against the spring force of the return spring 23, and the projection screen 1 is extended upward and stretched.

At this time, the left and right supporting shafts 3 are respectively 2
The holder 25 is stably supported by the individual holders 24 and 25, and the holder 25 at the inner position holds the support shaft 3 at a higher position than the holder 24 at the outer position. Both ends are supported so as to be pushed up diagonally upward, and the hanging down of the central portion of the winding pipe 2 is suppressed. As a result, the take-up pipe 2 smoothly pivots without causing runout, and the projection screen 1 can be easily stretched. Further, wrinkles of the projection screen 1 are prevented from being generated at the time of stretching.

When closing the projection screen 1, the winding pipe 2 is rotated by the restoring force of the return spring 23 by loosening the wire, and the projection screen 1 is wound around the outer peripheral surface of the winding pipe 2. . At this time, similarly, the wind-up pipe 2 is supported so as to be pushed up diagonally upward at both end portions, so that the center portion of the wind-up pipe 2 is prevented from hanging down, and as a result, the wind-up pipe 2 does not run out. The shaft can be smoothly rotated, and the projection screen 1 can be easily wound.

[0020]

As described above, according to the present invention, the left and right support shafts for rotatably supporting both ends of the take-up pipe are held in two places by using two holding tools, respectively, and the inner position is maintained. Since the holder is configured to hold the supporting shaft at a higher position than the holder at the outer position, the hanging of the center portion of the take-up pipe is suppressed, the take-up pipe rotates smoothly, and the projection screen Can be easily stretched and wound up, and wrinkles of the projection screen can be prevented at the time of stretching.

[Brief description of the drawings]

FIG. 1 is a front view showing the overall configuration of a projection screen apparatus according to an embodiment of the present invention.

FIG. 2 is a side view showing the projection curtain device in a stored state.

FIG. 3 is a partially cutaway side view showing a configuration of a suspension mechanism.

FIG. 4 is a partially sectional front view showing the structure of the holding device and the internal structure of the winding pipe.

FIG. 5 is a plan view showing a configuration of a holding device.

FIG. 6 is a side view showing a configuration of an outer holder.

FIG. 7 is a side view showing a configuration of an inner holder.

FIG. 8 is a side view showing a configuration of a movable projection screen device.

[Explanation of symbols]

 1 Projection screen 2 Winding pipe 3 Support shaft 4 Holding device 24, 25 Holder

Claims (1)

[Claims] 1. A take-up pipe for taking up a projection screen, left and right support shafts for rotatably supporting both ends of the take-up pipe, and the take-up pipe for holding each support shaft on an installation surface. And a left and right holding device for holding the support shaft in a horizontal state, each holding device includes two holding tools for holding the support shaft at two positions, and a holding tool at an inner position is a holding tool at an outer position. A projection screen device that holds the support shaft at a higher position.