JP4073286B2 - Automatic winding screen device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic winding screen device for dust prevention, light shielding, heat insulation, insect prevention, and the like. More specifically, the rotational urging force by twisting of a coil spring built in a winding shaft is applied to the screen. The present invention relates to a screen device as a take-up drive source, and relates to an automatic wind-up screen device provided with a damper for reducing impact and collision noise during winding by the coil spring.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a screen device in which a screen is wound around a winding shaft using a coil spring as a driving source and an operating rod for opening / closing operation is attached to the tip of the screen to automatically wind the screen is widely known. ing.
In this type of automatic winding type screen device, since the screen is wound by the rotational biasing force of the coil spring, the winding speed is increased when the winding is completed, and an operating rod attached to the tip of the screen is provided. There is a possibility of giving a large impact or a loud collision sound when colliding with the take-up box. As a countermeasure against this, consideration has been given such as providing a damper to suppress the increase in the take-up speed. (For example, refer to Patent Document 1).
[0003]
In the damper in this conventional screen device, normally, the rotational force of the winding shaft is always transmitted to the damper regardless of the rotation direction of the winding shaft, and the screen is attached to the winding shaft by a one-way clutch mechanism built in the damper. When the roll is wound, the resistance by the damper is applied to the winding shaft, and when the winding shaft is rotated in the direction in which the screen is expanded by rewinding, the screen can be easily extended without applying the resistance. I have to.
[0004]
However, since the one-way clutch mechanism is built in the damper, even when the take-up shaft is rotated in the direction in which the screen is extended, it is inevitable that a slight resistance acts on the extension operation. In the case of a damper, there is a problem that there is a resistance force due to friction between a rubber packing that prevents oil leakage in the damper and a shaft that passes through the rubber packing, and thereby the operation for extending the screen becomes somewhat heavy.
In addition, since the damper reduces the winding force of the coil spring for winding the screen, for example, when the wind is acting on the screen, the screen is provided with a damper. When compared with the case where there is no sheet, it is remarkably lowered, and in some cases, winding becomes difficult.
[0005]
[Patent Document 1]
Japanese Patent Application 2001-305371
[0006]
[Problems to be solved by the invention]
The technical problem of the present invention is to provide a screen device in which a screen is wound around a winding shaft using a coil spring as a driving source so that the screen is automatically wound. It is an object of the present invention to provide an automatic winding screen device that improves the operability by reducing the resistance when the screen is extended as much as possible while providing a damper for relaxing the above.
Another technical problem of the present invention is an automatic winding in which the winding force of the coil spring for winding the screen is effectively applied so that the damper does not operate until an arbitrarily set deceleration start time. The object is to provide a take-off screen device.
Another technical problem of the present invention is to provide an automatic winding screen device in which the deceleration start time can be easily adjusted.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention uses a rotational urging force generated by twisting of a coil spring built in a winding shaft for winding a screen as a driving source for winding the screen, and an opening / closing operation at the tip of the screen. A self-winding screen device with a hook attached and opened and closed to the screen, wherein the winding box is rotatably supported by the winding box and is attached to a bracket at one end of the winding box. The other end of the fixed coil spring is attached to a spring receiver fixed to the take-up shaft, and between the take-up shaft and the take-up shaft between the fixed shaft fixed to the bracket of the take-up box. In the case where a damper for applying a braking force is provided, the screen is wound on the fixed shaft in a direction in which the screen is extended against the rotational urging force of the coil spring. When rotating, the connection between the damper and the winding shaft is broken, and when the winding shaft rotates in the direction of winding the screen, the damper and the winding shaft are at least in the latter stage of winding. A one-way clutch mechanism connected between the dampers, and as a one-way clutch mechanism, a damper-side clutch piece coupled via a damper to a fixed shaft fixed to the winding box, and a winding shaft integrally A coil piece on the take-up shaft side that rotates but is slidable in the axial direction and is connected to a support shaft provided on the clutch piece on the damper side via a helical action mechanism, and the helical action In the mechanism, the clutch piece on the take-up shaft side rotates with respect to the support shaft, but when the take-up shaft is rotated in the direction in which the screen is extended, the clutch piece on the take-up side is separated from the clutch piece on the damper side. You When the take-up shaft rotates in the direction of winding the screen, it is configured as a mechanism that is driven in the direction approaching the clutch piece on the damper side. The clutch on the take-up shaft side is provided from the start of the screen winding by the take-up shaft until the start of deceleration at which the damper is operated by the mutual connection of the clutch pieces. When the piece is set to be drivable in the direction approaching the damper-side clutch piece, when the screen-side clutch piece exceeds the operating range of the spiral operation mechanism when the screen is extended on the support shaft. Further, the present invention is characterized in that an idling region is provided in which the clutch piece on the winding shaft side is idled on the spot with respect to the support shaft .
[0008]
In the automatic winding screen device having the above-described configuration, a one-way clutch that connects the damper and the winding shaft during winding of the screen between the damper on the fixed shaft fixed to the winding box and the winding shaft. Since a mechanism is provided so that the rotation of the winding shaft is not transmitted to the damper by the one-way clutch mechanism when the screen is extended, a resistance force due to friction in the damper may also act during the expansion operation of the screen. In addition, the resistance during screen expansion can be reduced as much as possible, and the screen can be expanded more easily than in the case where a one-way clutch mechanism is built in a conventional damper.
[0011]
Further, the braking force by the damper is applied to the winding shaft at an arbitrary time point, and the screen winding force by the coil spring can be effectively applied to the winding shaft without being reduced by the braking force.
[0012]
As the above-described spiral operation mechanism, it is possible to use screws that are screwed to each other provided on both the support shaft on the damper-side clutch piece and the clutch piece on the take-up shaft side, but is not limited thereto, for example, A protrusion such as a thread groove and a pin fitted into the thread groove can also be used.
[0013]
In the preferred embodiment of the present invention may be provided with biasing means for biasing the take-up shaft side of the clutch piece in the idling region on the supporting lifting axis in a helical movement mechanism side.
Furthermore, it is possible to adjust the standing depth of the support shaft with respect to the damper-side clutch piece, thereby making it possible to adjust the operation timing of the damper, that is, the deceleration start time of the winding shaft.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an automatic winding screen device according to the present invention will be described below in detail with reference to the drawings.
1 and 2 schematically show the overall configuration of a first embodiment of an automatic winding screen device according to the present invention. Here, the screen can be opened and closed horizontally. Although the screen device is shown, the screen device of the present invention is not limited to the horizontal pulling type, and can be applied to the case where the screen that opens and closes in the vertical direction is automatically wound upward.
In addition, the screen device is shown to be applied to light shielding, heat insulation, insect repellency, etc. in a building opening, but is not limited to those uses, and is used to distribute the front of a shelf or a dining table. The present invention can also be applied to a dustproof screen device for an opening portion of a distribution vehicle.
[0015]
The screen device shown in FIGS. 1 and 2 includes a screen frame 1 installed in a building opening, and a rotatable winding shaft 6 around which a screen 7 is wound around one side frame 2 of the screen frame 1. It is comprised by the winding box which supports. The screen frame 1 is configured by mutually connecting upper and lower frames 3 and 4 connected to the upper and lower ends of the side frame 2 and the other side frame 5 facing the side frame 2. The coil spring 9 is built in the take-up shaft 6 in the take-up box 2 and the screen 7 is automatically used with the rotational urging force caused by the twist of the coil spring 9 as a drive source for winding the take-up shaft 6. An opening and closing operation rod 8 is attached to the tip of the screen 7, and the hanging bracket 10 provided on the manipulation rod 8 is engaged with the side frame 5 when the screen 7 is stretched. The screen 7 can be held in a stretched state. The upper and lower ends of the screen 7 and the operating rod 8 are guided by the upper and lower frames 3 and 4.
[0016]
The winding shaft 6 is rotatably supported at both ends with respect to the upper and lower brackets 12 and 13 of the winding box via support members 14 and 15, respectively. The coil spring 9 is fixedly wound around a spring receiver 18 fixedly supported by the fixed shaft 16 and the other end of the coil spring 9 is connected to the fixed shaft 16. Reference numeral 16 denotes a spring receiver 19 which is rotatable and is fixed to the take-up shaft 6. Therefore, the winding shaft 6 of the screen 7 is connected to the fixed shaft 16 via the coil spring 9.
[0017]
As shown in detail in FIGS. 3 and 4, an oil damper 25 is provided at the tip of the fixed shaft 16, and a one-way clutch mechanism 30 is provided between the rotating shaft 25 a of the oil damper and the winding shaft 6. Provided.
When the winding shaft 6 is rotated in the direction in which the screen 7 is extended against the rotational biasing force of the coil spring 9, the one-way clutch mechanism 30 is connected to the damper 25 and the winding shaft 6. When the winding shaft 6 is automatically cut and rotates in the direction in which the screen 7 is wound by the urging force of the coil spring 9, the damper 25 and the winding shaft 6 are connected. .
[0018]
Specifically, the one-way clutch mechanism 30 rotates integrally with the damper-side clutch piece 31 connected to the rotary shaft 25a and the take-up shaft 6, but is slidable in the axial direction, and And a winding shaft side clutch piece 32 that is rotatably fitted to a support shaft 33 provided on the damper side clutch piece 31. The clutch pieces 31 and 32 are not engaged when the take-up shaft 6 is rotated in the direction in which the screen 7 is extended, but when the take-up shaft 6 is rotated in the direction in which the screen 7 is wound. Engaging clutch teeth 31a and 32a are provided.
[0019]
Further, as a biasing means for biasing the clutch piece 32 on the winding shaft side to the extent that both clutch teeth 31a and 32a are engaged with the clutch piece 31 on the damper side, the flange portion 33a at the tip of the support shaft 33 and the clutch A spring 34 is provided between the piece 32. The spring 34 only needs to be pressed to such an extent that the clutch piece 32 can always be brought into contact with the clutch piece 31 even when the screen device of FIG. If the weight of the clutch piece 32 is sufficient to always press the clutch piece 32 against the clutch piece 31 in the state of FIG. 1, the spring 34 can be omitted by using it as the urging means.
[0020]
The oil damper 25 has a casing connecting portion 25b connected to the fixed shaft 16, and the rotating shaft 25a is connected to a brake cylinder rotatably accommodated in the casing via a viscous fluid. However, the present invention is not limited to this, and various known structures can be employed. In the illustrated first embodiment, the connecting portion 25b of the casing of the damper 25 is connected to the fixed shaft 16, and the rotating shaft 25a of the damper 25 is connected to the clutch piece 31, but the connection is reversed. There is no problem.
[0021]
In the automatic winding screen device having the above configuration, the damper 25 and the winding shaft 6 are wound between the damper 25 and the winding shaft 6 on the fixed shaft 16 fixed to the winding box when the screen 7 is wound. The one-way clutch mechanism 30 for connecting the screen 7 is provided, and when the screen 7 is expanded, the rotation of the winding shaft 6 is not transmitted to the damper 25 by the one-way clutch mechanism 30 as shown in FIG. No resistance caused by friction or the like in the damper 25 is applied during the expansion operation of 7, and the resistance during the expansion of the screen 7 is reduced as much as possible, and a one-way clutch mechanism is built in the conventional damper Compared to the above, the screen can be expanded more easily.
[0022]
On the other hand, when the screen 7 is wound by the rotational urging force accumulated in the coil spring 9, the one-way clutch mechanism 30 is connected as shown in FIG. 25, the winding shaft 6 is rotated by the rotational urging force of the coil spring 9, but the increase in rotational speed is suppressed by the buffering force of the damper 25. Thus, it is possible to prevent the operation rod 8 from giving a large impact or generating a large collision sound when it collides with the winding box.
[0023]
5 to 7 show the operation mode of the main part of the second embodiment of the present invention. Since the overall configuration excluding the one-way clutch mechanism portion of the second embodiment is substantially the same as that of the first embodiment described with reference to FIGS. 1 and 2, the following description of the second embodiment will be omitted. The same parts as those of the first embodiment will be described by using the reference numerals of the first embodiment attached to the drawings, and overlapping descriptions thereof will be omitted.
[0024]
As in the case of the first embodiment, the one-way clutch mechanism 40 in the second embodiment is a damper-side clutch piece 41 connected via a damper 25 to a fixed shaft 16 fixed to the bracket 13 of the winding box. And a winding that rotates integrally with the take-up shaft 6 but is slidable in the axial direction and is connected to a support shaft 43 provided on the damper-side clutch piece 41 via a spiral operation mechanism 44. And a clutch piece 42 on the shaft side. The damper 25 itself is as described in the first embodiment.
[0025]
Clutch teeth 41 a and 42 a that mesh with each other are provided between the clutch pieces 41 and 42. These clutch teeth 41a and 42a do not mesh when the winding shaft 6 is rotated in the direction in which the screen 7 is extended, but mesh when the winding shaft 6 rotates in the direction in which the screen 7 is wound. Although it is desirable, it is not always necessary to provide such a configuration, and it is possible to transmit rotation by mutual pressure contact.
[0026]
As shown in the drawing, the spiral operation mechanism 44 is formed by a male screw 45 and a female screw 46 which are screwed to each other provided on both the support shaft 43 on the damper-side clutch piece 41 and the clutch piece 42 on the take-up shaft side. For example, a thread groove provided on the support shaft 43 or the clutch piece 42 and a protrusion such as a pin fitted to the other provided on the other side can be used. In short, when the clutch piece 42 on the winding shaft side rotates with respect to the support shaft 43 and rotates the winding shaft 6 in the direction in which the screen 7 is extended, the clutch piece 42 is rotated. When the take-up shaft 6 is driven in a direction away from the damper-side clutch piece 41 and rotates in the direction of taking up the screen 7, the mechanism is driven in a direction approaching the damper-side clutch piece 41. I just need it.
[0027]
In the spiral operation mechanism 44 between the clutch piece 42 and the support shaft 43 in the illustrated second embodiment, the winding of the screen 7 by the take-up shaft 6 is started by the length of the male screw 45, and then the clutch pieces 41, 42, the winding amount of the screen 7 until the start of deceleration at which the damper 25 operates is set by mutual connection, and the clutch piece 42 on the winding shaft side is driven in the direction approaching the clutch piece 41 on the damper side during that time (Screw). FIG. 5 shows a state when the winding of the screen 7 is started by the winding shaft 6, and FIG. 6 shows a state where the damper 25 is operated by the mutual connection of the clutch pieces 41 and 42.
[0028]
When the winding amount of the screen 7 from the start of deceleration to the start of deceleration is set by the length of the male screw 45 in this way, the damper 25 does not operate from the start of winding to the start of deceleration. Even if an external force such as wind acts on the screen, the screen 7 can be wound using the strong winding force of the coil spring 9 as it is.
[0029]
When the take-up shaft 6 rotates in the screen extending direction, the clutch piece 42 is screwed in a direction away from the clutch piece 41 as shown in FIG. Therefore, the rotation of the winding shaft 6 is not transmitted to the damper 25, and the screen 7 can be easily extended.
[0030]
When the expansion operation of the screen 7 is continued and the clutch piece 42 exceeds the operating range of the helical movement mechanism 44, that is, the female screw 46 of the clutch piece 42 screwed into the male screw 45 is within the range of the male screw 45. In order to cause the clutch piece 42 to idle with respect to the support shaft 43 when exceeded, an idling region 47 (see FIG. 6) without a screw is provided at the engraved end of the male screw 45 on the support shaft 43. . The engraving range of the male screw 45 is from when the screen 7 is taken up by the take-up shaft 6 from the fully extended state until the pair of clutch pieces 41 and 42 are joined and the damper 25 starts operating. It is necessary to make the range within which the female screw 46 of the clutch piece 42 moves. Even when the present invention is applied to a screen device having a difference in the length of the screen 7, the difference in length is absorbed by the idling region 47.
[0031]
As an urging means for urging the clutch piece 42 in the idling region 47 on the support shaft 43 toward the male screw 45, a spring 48 is provided between the flange portion 43 a at the tip of the support shaft 43 and the clutch piece 42. Is provided. Since the configuration and operation of the spring 48 are substantially the same as those of the spring 34 of the first embodiment, description thereof is omitted.
[0032]
A support shaft 43 is erected on the damper-side clutch piece 41 by screwing so that the screwing position can be fixed by a fastening element 49 such as a set screw. The standing depth of the support shaft can be freely adjusted by removing the fastening element 49 and changing the standing depth of the support shaft 43 with respect to the clutch piece 41, thereby the length of the male screw 45. Changes, the operation timing of the damper 25 can be adjusted.
[0033]
【The invention's effect】
As described in detail above, according to the automatic winding screen apparatus of the present invention, the screen is wound around the winding shaft using a coil spring as a drive source, and the screen is automatically wound. In the above, while providing a damper for alleviating the impact and impact sound at the time of winding the screen, the operability can be improved by reducing the resistance at the time of expanding the screen as much as possible. The winding force of the coil spring for winding the screen can be effectively applied by preventing the damper from operating until a deceleration start time that can be arbitrarily set.
[Brief description of the drawings]
FIG. 1 is a partially broken front sectional view showing a first embodiment of an automatic winding screen device according to the present invention.
FIG. 2 is a cross-sectional view of the same. FIG. 3 is a cross-sectional view of a winding shaft in a damper operating state (when the screen is wound) of the first embodiment.
FIG. 4 is a cross-sectional view of the winding shaft in the damper inoperative state (when the screen is stretched) according to the first embodiment.
FIG. 5 is a cross-sectional view of the take-up shaft at the start of screwing of the take-up shaft side clutch piece of the second embodiment of the present invention (at the start of screen winding).
FIG. 6 is a sectional view of the winding shaft in the damper operating state of the second embodiment.
FIG. 7 is a cross-sectional view of the winding shaft when the screen of the second embodiment is extended.
[Explanation of symbols]
6 Winding shaft 7 Screen 8 Operating rod 9 Coil spring 12, 13 Bracket 16 Fixed shaft 19 Spring receiver 25 Oil damper 30, 40 One-way clutch mechanism 31, 32, 41, 42 Clutch piece 33, 43 Support shaft 31a, 32a, 41a, 42a Clutch tooth 44 Spiral operation mechanism 45 Male thread 46 Female thread 47

Claims (4)

A rotating biasing force generated by a coil spring incorporated in a winding shaft for winding the screen is used as a driving source for winding the screen, and an opening / closing operation rod is attached to the tip of the screen so as to open / close the screen. An automatic winding screen device,
The winding shaft is rotatably supported by the winding box, and the other end of the coil spring fixed to the bracket at one end of the winding box is attached to a spring receiver fixed to the winding shaft. In what provided the damper which makes braking force act on this winding axis between the fixed axis fixed to the bracket of the winding box and the winding axis,
When rotating the winding shaft in a direction to stretched screen against the rotational bias of the upper Symbol coil spring is broken the connection between the damper and the winding shaft, the direction in which the take-up shaft implicate screen When rotating at least in the latter stage of winding, interposing a one-way clutch mechanism connected between the damper and the winding shaft ,
As a one-way clutch mechanism, a damper-side clutch piece connected via a damper to a fixed shaft fixed to the winding box, and a single-side clutch mechanism that rotates integrally with the winding shaft, but is slidable in the axial direction, and A winding shaft side clutch piece connected to a support shaft provided on the damper side clutch piece via a helical movement mechanism;
In the helical movement mechanism, the clutch piece on the take-up shaft side rotates with respect to the support shaft. However, when the take-up shaft is rotated in the direction in which the screen is extended, the clutch on the damper side is rotated along with the rotation. It is driven in the direction away from the piece, and when the take-up shaft rotates in the direction of winding the screen, it is configured as a mechanism driven in the direction approaching the clutch piece on the damper side,
Both clutch pieces are provided with clutch teeth that mesh with each other when they abut.
In addition, the above-described spiral movement mechanism is configured such that the winding shaft side clutch piece is changed to the damper side clutch piece from the start of winding of the screen by the winding shaft until the start of deceleration at which the damper is operated by the mutual connection of the clutch pieces. Set to be able to drive in the direction approaching
On the support shaft, when the clutch piece on the take-up shaft side exceeds the operating range of the spiral operation mechanism when the screen is extended, the clutch piece on the take-up shaft side is moved in place with respect to the support shaft. A free-wheeling area was set up to idle,
A self-winding screen device characterized by that. The helical movement mechanism is a screw that is screwed to each other provided on both the support shaft on the damper-side clutch piece and the clutch piece on the take-up shaft side,
The automatic winding screen device according to claim 1. Provided with a biasing means for biasing the clutch piece on the winding shaft side in the idling region on the support shaft toward the spiral movement mechanism;
The automatic winding screen device according to claim 1 or 2 , characterized in that It is possible to adjust the standing depth of the support shaft with respect to the clutch piece on the damper side, thereby making it possible to adjust the operation timing of the damper.
The automatic winding screen device according to any one of claims 1 to 3 .

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