JPS5918443Y2 - Dendoushikieishiyayo Screen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric screen that prevents wrinkles in the vertical and horizontal directions and can be smoothly raised and lowered at any angle of inclination.

Conventionally, in this type of roll-up type projection screen in a case, a spring is used for automatic wind-up.

Therefore, the elasticity of this spring always acts to wind up the screen, so after pulling out the screen during projection, it is necessary to hold the screen in the pulled out state against the winding force of this spring. be.

In order to maintain this screen drawn out state, a bendable link is provided at the center of the screen (for example, as in 73436/1985), and when the link becomes straight, it becomes like a single rod. It is configured to resist the winding force of the spring.

However, in this known method, since the link resists the winding force of the spring, the link becomes large and thick, and its weight increases, so that only this link tends to sag when the screen is rolled up, especially when the screen is rolled up. Since tension is applied to the screen only in the center, the screen becomes loose on both sides of the screen, where no tension is applied, resulting in many wrinkles, especially in the vertical direction, which can cause problems during projection. .

The present invention was devised in view of this, and will be described below based on examples.

In the figure, 1 is a screen winding shaft that winds up a screen for projection, a shooting studio back, etc. (hereinafter simply referred to as the winding shaft), and this winding shaft 1 winds up the screen S of the required shaft. The winding shaft 1 has a small-diameter shaft portion 1a, which is made of a cylinder having a length necessary for winding the screen and a diameter that is small enough to prevent wrinkles from forming on the screen when winding the screen.
, la are rotatably supported by a mounting base 3 via bearings 2, 2.

Further, a reversible motor M is fixed to one end of this mounting base 3 coaxially with the winding shaft 1, and the shaft of this motor M and the winding shaft 1 are integrally connected through a shaft coupling 4 or directly connected. At the other end of the mounting base 3, a controller 5 consisting of a limit switch, a capacitor, a relay, etc. is installed to switch between forward and reverse rotation, start and stop of the motor M, and the controller 5 is connected to the winding shaft. Control is performed by driving the.

Further, one end of a required projection screen S is attached to the winding shaft 1, and the screen is wound up or rewound by rotation of the winding shaft 1, and the tip of the screen is A pipe-shaped stopper 6 is attached to the entire width of the rod.

A mounting plate 7 having a cross-sectional shape, etc., is fixed to approximately the center of this stopper 6, and the lower ends of the two lower links La, La are swingable to this mounting plate 7 via screws or shafts 8, 8. Further, the upper links Lb, Lb are pivotally connected to the upper ends of the lower links La, La through shafts 9, 9, and bosses 10 and 10 are formed on the upper ends of the upper links Lb, Lb, A thrust bearing B is placed between this boss 10.10 and the mounting rod 11.
.

The link is pivoted on the mounting rod 11 with a shaft 12 via B so that the link can be smoothly bent and extended without being distorted no matter what angle of inclination it holds.

This mounting rod 11 is located approximately at the center of the mounting base 3,
It is attached via a shaft 14 to a bracket 13 provided at a position opposite to a mounting plate 7 provided on the stopper rod so as to be able to move up and down.

That is, since the mounting rod 11 can be moved up and down by the shaft 14,
The upper and lower links supported by this mounting rod can be tilted back and forth, and the screen S can be tilted to any desired angle.

In the above embodiment, a screen has been described, but the present invention can also be applied to electric winding types such as maps and curtains at any time.

In the electric projection screen constructed as described above, in order to adjust the inclination of the screen surface to be approximately perpendicular to the projection direction, a portion of the stopper or link is tilted.

As mentioned above, the upper and lower links supported by the mounting rod 11 and the entire screen tilt around the shaft 14, and the motor must be rotated in the normal direction to lower or rewind the screen. When the screen winding shaft is rotated to the screen rewinding side, the screen will be automatically rewound by the link mechanism, stopper, and the screen's own weight.If the motor is controlled via the controller and stopped at any position, the screen will be rewound. It is held in that position and in a suspended state.

Further, when the motor is rotated in the normal direction and the link mechanism is extended to a set position, a limit switch is activated to stop the motor.

Usually this link is expanded using a screen.

Therefore, in this invention, the height or inclination of the screen can be selected depending on the ceiling of the room to be projected, the height of the floor (the height of the room), etc. by tilting the screen, rolling it up and down, and lowering it. You can watch movies in this state.

Note that when the screen is raised and taken up, if the motor is reversed in the opposite direction to the above, the screen is taken up by the rotation of the screen take-up shaft, and the link mechanism is automatically bent accordingly.

In this case, the link mechanism installed in the center of the screen allows the screen to be smoothly rewound without wrinkles.
It can be rolled up.

According to the present invention, winding and unwinding of the screen can be automatically performed by forward and reverse rotation of the motor provided at the end of the screen winding shaft using a motor equipped with a controller and a specified link mechanism, and the screen tension can be adjusted automatically. Since the link mechanism is bent and stretched at the pivot point with the mounting rod, the screen can be held at a desired angle, and the motor is controlled by rotation of the take-up shaft, so it can be moved to any position. It also has the advantage of being able to be raised and lowered by remote control.

[Brief explanation of the drawing]

FIG. 1 is a rear view, FIG. 2 is a side view, and FIG. 3 is a perspective view of the link mechanism.

Claims (1)

[Scope of utility model registration request] A screen winding shaft 1 for winding up the screen S is connected to a bearing 2,
A motor M capable of forward and reverse rotation is inseparably connected to the screen winding shaft 1, and a controller 5 for stopping the motor at any position or controlling its operation. A mounting plate 7 is attached to the center of a stopper 6 provided at the tip of the screen to be wound onto the screen winding shaft 1, and a mounting rod provided on the mount 3 is movable. 11, a link that is more powerful than the connection between the two upper and lower links La and Lb, which are refractably connected through the shafts 9 and 9, is arranged, and the link between these two sets of links is The upper end portion and the lower end portion are pivotally connected to the mounting rod 3 and the mounting plate 7, respectively, so that they can be opened and closed laterally, and a link mechanism that extends and contracts laterally by means of link groups La, La, Lb, and Lb is provided. The upper link Lb of the link mechanism, and the mounting rod 11 of Lb are connected to the axis 1.
4, the screen can be tilted and adjusted to a desired angle of inclination, so that the projection surface can be optimized by stopping the screen at an arbitrary height and selecting the inclination. An electric projection screen characterized by: