JP2661829B2 - Roll screen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll screen, and more particularly to a lifting device for lifting and stopping a screen.

[0002]

2. Description of the Related Art A roll screen is used as one of interior mechanisms capable of changing the indoor atmosphere by rolling down or winding up a cloth or the like wound on a pipe to an appropriate height, or as a substitute for a blind. Various types of light shielding devices for window surfaces have been conventionally provided.

One of the problems with this roll screen is that the operation of rolling down the screen to an appropriate position to stop the screen, and at the time of winding up, a smooth winding operation can be easily performed. The purpose of the present invention is to make it possible to realize this with a mechanism having a simple configuration. Actually, this kind of conventional mechanism has a problem that the configuration is relatively complicated, the number of parts is large, and the number of assembling steps is large and complicated.

Japanese Utility Model Laid-Open No. 63-111598 is one of the proposals having a configuration relatively similar to the present invention for the purpose of simplifying such a mechanism. This comprises a mechanism having a guide groove formed on the circumferential surface of the fixed shaft and a ball connected to the winding cylinder of the screen,
The guide groove includes a first continuous groove that allows the cylindrical body to rotate one or more turns in the winding direction of the screen, and a second continuous groove that allows the cylindrical body to rotate one or more turns in the unwinding direction of the screen. It is formed by a combination of two continuous grooves of grooves and an operation control groove for temporarily stopping rotation of the cylindrical body by applying a manual operation or canceling the stop.

[0005]

However, the lifting device proposed in the above-mentioned proposal (Japanese Utility Model Laid-Open No. 63-111598) requires an operation control groove for controlling the movement of a complicated ball and two continuous circumferential grooves. However, in addition to the problem that the structure is not always simpler than the conventionally proposed lifting device, there is a problem that can be said to be fatal as a practical roll screen.
That is, in the proposed configuration, the stop position when the screen is unwound is given by the locking portion provided to regulate the ball movement in the operation control groove formed on the fixed shaft, There is a problem that the screen cannot be stopped at positions other than the positions of the locking portions provided on the fixed shaft.

More specifically, for example, even if it is considered that the locking portions are formed on the fixed shaft at as small an interval as possible, it is necessary to ensure stable movement of the ball (generally, grease is provided in the groove. ), And the geometrical arrangement of the operation control grooves for guiding complex movements, etc., so that the screen stop position interval can be set to 1 within a practically inconvenient range.
It is not easy to make it 0 cm or less.

[0007] This drawback is that, considering the thickness of the screen cloth and the dimensional tolerance of the screen take-up cylinder, etc., the screen unwinding position is limited except when a plurality of products of the same standard are used in parallel. Since it is not easy to arrange them, it is a major problem to be improved for applications that emphasize interior feeling.

The present invention has been made in order to solve such a problem, and a first object of the present invention is to make a mechanism for controlling lifting / lowering / stopping of a screen as simple as possible.

Another object of the present invention is to provide a roll screen capable of accurately responding to the operator's intention at the stop position when the screen is rolled down.

[0010]

The roll screen according to the present invention, which achieves the above objects, is characterized by a fixed shaft provided horizontally, and fitted around the outside of the fixed shaft so as to surround the fixed shaft. A forward rotation in the screen unwinding direction is allowed, but a reverse rotation in the screen winding direction is restricted, and a ball which is slid so as to be able to move in the groove of the grooved drum. A screen winding cylinder provided to surround the grooved drum so as to rotate integrally with the ball, and means for constantly energizing the screen winding cylinder with the rotational force in the winding direction (reverse direction). A roll screen provided with the grooved drum as a path that allows the ball to rotate over one or more turns relative to the drum in the winding direction (reverse direction). A continuous groove formed continuously in the same direction, and a bypass groove formed as a detour to the single continuous groove. A first branch that locks the branch entrance from the continuous groove that allows the ball to enter only when rotating in the (positive direction) and the relative unwinding (positive direction) rotation of the ball that has entered the bypass groove; A stop portion, a second stop portion for stopping rotation of the ball when the ball locked by the first stop portion rotates in the winding direction (reverse direction) with respect to the drum, and a second stop portion for locking the rotation of the ball. And a converging port for returning the ball to the continuous groove when the ball locked to the stopper rotates in the unwinding direction (forward direction) with respect to the drum. .

In the construction of the present invention, one-way clutch means such as a clutch assembled between the fixed shaft and the grooved drum is used to restrict the rotation of the grooved drum with respect to the fixed shaft in the normal direction but the rotation in the reverse direction. A spring can be used.

Although a plurality of bypass grooves of the grooved drum can be provided at intervals in the circumferential direction, it is often practical to provide two or three by-pass grooves.

According to the structure of the present invention, the use of the grooved drum rotatable in one direction with respect to the fixed shaft simplifies the geometrical shape of the groove formed in the grooved drum. The burden of molding this grooved drum is reduced, and the movement of the ball is reliably obtained, so that the reliability of the apparatus is increased.

In particular, since the grooved drum is not fixed, the position where the screen is wound down and stopped can correspond to the operator's intention almost exactly.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS.

In these figures, reference numeral 1 denotes a set frame which is fixed to a wall surface, a ceiling surface or the like, and a pair of side plates 2 are fixedly assembled at both ends thereof (only one side is shown in FIG. 2). Reference numeral 3 denotes a fixed shaft fixed to the side plate 2, and a pair of side plates 2.
To form a base shaft that rotatably supports a screen winding cylinder 6 described later.

Reference numeral 4 denotes a stopper case fitted to the fixed shaft 3, which is rotatably provided in the circumferential direction with respect to the fixed shaft 3 via a bearing 5. On the outside of the stopper case 4, a winding pipe 6 for a screen (not shown) is integrally fixed.

Reference numeral 7 denotes a grooved drum provided outside the fixed shaft 3 and is connected to the inside fixed shaft 3 via a clutch spring 8 so as to move in the forward direction (the direction in which the screen is unwound). In this case, the clutch spring 8 is loosened and allowed to rotate, and rotation is allowed. In the opposite direction (the direction in which the screen is wound up), the rotation is restricted by the tightening direction. The grooved drum 7 is formed with a single circumferential continuous groove 71 on its outer peripheral surface and a bypass groove 72 as a detour to the continuous groove 71, and a ball that slides into these grooves. 9 is formed such that the grooved drum 7 and the stopper case 4 rotate integrally with each other by sliding into the generatrices 41 of the stopper case 4.

The circumferential continuous groove 71 is formed as shown in FIG.
As shown in (1), the ball 9 (and thus the screen take-up cylinder 6) serves as a groove for allowing the grooved drum to rotate one or more turns in the direction of winding up the screen.

The bypass groove 72 is provided only when the ball 9 rotates in the forward direction with respect to the drum 7.
Branching entrance 721 from a continuous groove that allows entry of the ball 9, a first stop 722 that stops the relative forward rotation of the ball 9 that has entered the bypass groove 72, and the first stop 722. When the stopped ball 9 rotates in the reverse direction with respect to the drum 7, the second stop portion 723 that stops the ball from rotating in the reverse direction, and the ball 9 that is locked by the second stop portion 723. When the ball 9 rotates in the forward direction with respect to the drum 7, the ball 9 is formed to have a confluence outlet 724 for returning the ball 9 to the continuous groove 71.

The screen winding cylinder 6 has
Although a spring for always rotating this in the screen winding direction is assembled, it is not shown.

Next, the operation of the roll screen of this embodiment will be described.

If it is assumed that the screen has been completely wound up and the screen is to be wound down, the grooved drum 7 is allowed to rotate in the forward direction with respect to the fixed shaft 3 in this case. 6 rotates freely (at this time, the ball 9 is located at the first stop portion 722 of the bypass groove 72 as shown in FIG. 5).

Next, when the screen is lowered to a desired predetermined position, where the screen is unwound and the hand is released, the cylinder 6 tries to rotate in the screen winding direction by the biasing spring force. As a result, the ball 9 tends to rotate in the opposite direction with respect to the grooved drum 7, and the second stopper 7
23 (see FIG. 5).

Therefore, the screen stops at that position.

Next, when the screen is to be wound up, when the screen is slightly wound down, the ball 9 moves from the second stop portion 723 in FIG. 5 to the continuous groove 71, where the ball is released. The ball 9 is moved by the spring force in the winding direction urged by the screen, as shown in FIG.
As shown in (1), the inside of the continuous groove 71 is moved, and a smooth winding is performed.

[0027]

According to the configuration of the roll screen of the present invention, since the geometrical shape of the groove formed in the grooved drum is simplified, a mechanism for controlling the vertical movement and stop of the screen is provided.
Since the apparatus can be simplified as compared with the conventional apparatus, the burden at the time of molding and assembling is small, and the movement of the ball can be reliably obtained, thereby increasing the reliability of the apparatus.

In the roll screen of the present invention, since the grooved drum can rotate in one direction (positive direction) with respect to the fixed shaft, the stop position when the screen is unwound can be set faithfully to the operator's intention. There is an effect that it can be made to correspond.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a configuration outline of a roll screen lifting / lowering apparatus of the present invention as a part development view;

FIG. 2 is a vertical sectional front view of the assembled state;

FIG. 3 is a vertical sectional side view of the assembled state.

FIG. 4 is a diagram illustrating a state in which a ball moves in a continuous groove of a grooved drum when a screen is wound up,

FIG. 5 is a view illustrating a state in which a ball moves in a bypass groove of a grooved drum when a screen is rolled down.

[Explanation of symbols]

3: rotating shaft, 4: stopper case, 5: bearing,
6: screen winding pipe, 7: grooved drum,
8: clutch spring, 9: ball, 71: continuous groove,
72: bypass groove, 721: branch inlet, 722: first stop, 723: second stop, 724: junction outlet.

Claims (3)

(57) [Claims] 1. A fixed shaft provided horizontally and fitted around the outside of the fixed shaft so as to be able to rotate forward in the direction of winding down the screen around its circumference, but to rotate in the reverse direction of winding up the screen. Is a constrained grooved drum, a ball slidably fitted in the groove of the grooved drum, and a screen winding provided around the grooved drum so as to rotate integrally with the ball. A roll screen comprising: a cylindrical body; and means for constantly energizing the screen winding cylindrical body with the reverse rotational force, wherein the grooved drum has a structure in which the ball is relatively to the drum. Having a single continuous groove formed continuously in the circumferential direction as a path that allows the rotation in the opposite direction over one or more turns, and having a bypass groove formed as a detour to the single continuous groove. In addition, the bypass groove includes a branch entrance from a continuous groove that allows the ball to enter only when the ball rotates in the forward direction with respect to the drum, and a relative forward rotation of the ball that enters the bypass groove. And a second stop for locking the ball in the reverse direction when the ball locked in the first stop rotates in the reverse direction with respect to the drum. And a converging outlet for returning the ball to the continuous groove when the ball locked to the second stopper rotates in the forward direction with respect to the drum. Roll screen to do. 2. A clutch spring according to claim 1, wherein the clutch spring is mounted between the fixed shaft and the grooved drum as means for permitting the grooved drum to rotate in the forward direction with respect to the fixed shaft but restricting the rotation in the reverse direction. Roll screen to feature. 3. The roll screen according to claim 1, wherein two bypass grooves of the grooved drum are provided in the circumferential direction so as to be separated from each other.