JPS6346225B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of the Invention The present invention relates to winding various screens such as curtains, blinds, lightweight shutters, and projection screens onto a winding shaft and pulling out the screen from the winding shaft. relates to a screen winding device that accumulates acting force in a spring built into a winding shaft, and that during winding, the winding shaft is reversed by the acting force accumulated in the spring to wind up the screen. .

(B) Background of the Invention As a means for automatically locking the screen when the screen is pulled out from the winding shaft and released at an arbitrary position, a roll clutch that causes the roll to fall into the engagement groove by its own weight has conventionally been used. Although a means exists, in the case of this roll clutch, the movement of the roll is unstable, so that reliable locking and unlocking cannot be achieved, and the locking and unlocking operations have to be performed many times.

(C) Object of the Invention The object of the present invention is to provide a screen winding device that can reliably move a locking roller that automatically locks the screen and can accurately automatically lock and unlock the screen.

(D) Summary of the Invention This invention fixes a roll holder holding a locking roller between opposing surfaces of a second carrier and a third carrier such that it can move in and out of the locking roller in the radial direction. is provided with a locking annular body having an engaging portion formed on the inner surface with which the locking roller engages;
An operating annular body for operating the locking roller in and out is provided on the inner circumference of the roll holder, and the operating annular body is supported on a support shaft via a one-way clutch that is in a transmission state in the direction in which the screen is pulled out. A one-way clutch that is in a transmission state in the winding direction of the screen is interposed between the third carrier, and a one-way clutch that is in a transmission state in the winding direction of the screen is interposed between the lock annular body and the cylinder shaft. It is characterized by an interposed screen winding device.

(e) Effects of the Invention According to this invention, when the screen is pulled out and released at an arbitrary position, the screen is automatically locked, and when winding up, the screen is locked by pulling it once in the direction in which it is pulled out. The screen can be unlocked and wound up, making it extremely easy to lock and unlock the screen. Furthermore, the locking roller is forcibly pushed out by the operating annular member and the locking annular member is pushed in, thereby ensuring reliable locking and releasing operations, resulting in good operability.

Furthermore, since the rotation of the winding shaft is increased by the planetary gear and transmitted to the roll holder, the amount of return of the winding shaft when the screen is locked at the desired position is reduced, and the amount of rotation when the screen is stopped is reduced. Positional deviation is extremely small, making it easy to lock the screen at a desired position.

(F) Embodiment of the Invention An embodiment of the invention will be described below based on the drawings.

The drawings show a roll blind for sun protection and light protection as an example of a screen winding device. In FIGS. 1 and 2, a winding shaft 1 formed in a cylindrical shape has a spring (not shown) at the other end. is built-in, and a blind 2 is wound around the circumference with one end fixed, and when this blind 2 is pulled out, the acting force is accumulated in the above-mentioned spring, and when the blind 2 is wound up, the force is accumulated. It is wound up by the force of the spring. Note that the mechanism for accumulating the acting force of this spring is well known, so its explanation will be omitted.

An inner tube 3 made of a rubber material and a cylindrical casing 4 made of a resin material are integrally connected and fitted inside the end of the winding shaft 1, and a resin material is inserted into the inner tube 3. The inner tube 3, the casing 4, and the cylinder shaft 5 interlock with the winding shaft 1 described above.

A bearing member 6 is inserted into the center of the above-mentioned cylindrical shaft 5, and a fixed shaft 7 is inserted through and supported by this bearing member 6. The outer end of the fixed shaft 7 has a hexagonal mounting portion 8, and this mounting portion 8 is inserted into a hexagonal mounting hole 10 of the mounting member 9, so that the fixed shaft 7 is prevented from rotating. Ru. Note that the mounting member 9 is mounted on a fixed wall at the portion where the roll blind is mounted.

A first carrier 1 is disposed on the inner end side of the above-mentioned fixed shaft 7.
1 are arranged in series, and one end of a support shaft 12 is inserted through the axial center of the carrier 11 and is rotatably supported.

Further, the first carrier 11 has a shaft 14 connected to the planetary gear 13 from the carrier 11.
An internal gear 15 that is pivotally supported by the planetary gear 13 and meshes with the planetary gear 13 is connected to the inner end side of the aforementioned cylindrical shaft 5, and a sun gear 16 that meshes with the planetary gear 13 is rotatably supported on the aforementioned support shaft 12. It is bearing.

A second carrier 17 is provided in series on the inner end side of the sun gear 16, and a third carrier 18 is provided opposite to this carrier. The cylindrical roll holder 19 is fixed in position, and both carriers 1 are
7 and 18 are connected, and the roll holder 19 holds locking rollers 20 at three equally divided positions so as to be movable in and out in the radial direction.

A lock annular body 21 is supported on the outer periphery of the roll holder 19 so as to be relatively rotatable, and the inner circumferential surface of the lock annular body 21 has a concave engagement portion with which the aforementioned lock roller 20 engages. 22 is equally divided into 3
It is formed at the location of the spot.

An operating annular body 23 made of a permanent magnetic material is relatively rotatably positioned on the inner circumferential portion of the roll holder 19, and is pivotally supported on the aforementioned support shaft 12, and is equally divided on the outer circumferential surface. The above-mentioned locking roller 20 is housed in the three positions, and recesses 24 are formed in which the outside of the roller 20 is positioned inside the outer circumferential surface of the roll holder 19, and the other circumferential surface is When the locking roller 20 comes into contact with this, the roll holder 19
A portion of the circumferential surface of the locking roller 20 protrudes from the outer circumferential surface of the locking roller 20.

Between the above-mentioned operation annular body 23 and the support shaft 12,
A one-way clutch 25 is interposed which becomes a transmission state when the blind 2 is rotated in the drawing direction, and this clutch 24 is constituted by a spring clutch. Furthermore, there is a gap between the outer circumferential surface of the shaft portion 26 of the operating annular body 23 and the inner circumferential surface of the shaft portion 27 of the third carrier 18, which is one direction in which transmission occurs when the blind 2 rotates in the winding direction. A clutch 28 is interposed.

A one-way clutch 29 is interposed between the outer peripheral surface of the lock annular body 21 and the cylindrical shaft 5, and becomes a transmission state when the blind 2 rotates in the winding direction, and this one-way clutch 29 is composed of a spring clutch. As shown in FIG. 3, the spring end 30 on the locking side that is locked to the cylindrical shaft 5 is formed in a U-shape to provide a buffering function.

A rotation regulating structure 31 is constructed between the above-mentioned spindle 12 and the second carrier 17, and this structure includes a regulating plate 33 fixed to the spindle 12 and having a pin 32 protruding toward the carrier 17, and a rotation regulating structure 31 between the spindle 12 and the second carrier 17. 17 and a groove 34 that fits into the aforementioned pin 32 to allow relative rotation within a predetermined range, and the aforementioned range is the range required for the operation annular body 23 to lock and release the lock. It is set within the rotation range.

A small diameter portion 35 is formed on the inner end side of the casing 4, and a casing 36 made of iron material is covered with a predetermined gap therebetween, and this casing 36 is fixed to the casing 36. . A bearing member 37 is mounted inside the inner end of the casing 36, and the inner end of the aforementioned support shaft 12 is supported on the bearing member 37.

Balls 38, 38 are interposed on both ends of the above-mentioned support shaft 12, and a spring 38 is interposed on the fixed shaft 7 side, and this spring 39 presses and biases the support shaft 12 toward the other side. , which provides resistance to the rotation of this support shaft 12.

On the outer peripheral surface of the small diameter portion 35 of the casing 4, an even number of permanent magnets 40 are arranged and fixed at equal intervals in the circumferential direction, and the polarities of adjacent magnets 40 are opposite to each other. .

The outer peripheral surface and end surface of the above-mentioned permanent magnets 40 are covered with a cylindrical rotating body 41 made of aluminum material with a predetermined gap, and the base end of this cylindrical rotating body 41 is fixed to a boss member 42. , a cylindrical shaft 43 inserted into the above-mentioned support shaft 12 of this boss member 42 in an idling state.
is fixed.

The end of the cylindrical shaft 43 is interlocked with the shaft 27 of the third carrier 18 via a one-way clutch 44 which is brought into a transmission state as the blind 2 rotates in the winding direction.

The magnetic field of the permanent magnets 40 described above reaches the casing 36 made of an iron material on the outer periphery, and the cylindrical rotating body 41 made of an aluminum material rotates relatively in this magnetic field. An eddy current is generated on the surface, and this eddy current causes a braking action between the cylindrical rotating body 41 and the casing 4 to which the permanent magnets 40 are fixed. This braking action is applied when the one-way clutch 44 is in the transmission state in the winding direction of the blind 2.

The operation of the blind winding device constructed in this way will be explained.

For example, as shown in FIG.
When the blind 2 is pulled out to a predetermined position in a state where the blind 2 is wound around the winding shaft 1, the rotation of the winding shaft 1 due to this pulling out is caused by the casing 4, cylinder shaft 5, internal gear 15, and planetary gear. 13. Rotate the second carrier 17 via the sun gear 16. Note that the second carrier 17 rotates in the opposite direction to the rotation direction of the winding shaft 1 due to the interposition of the planetary gear 13. Also, a one-way clutch 29 between the lock annular body 21 and the cylinder shaft 5
is free, so the lock annular body 2 is removed from the cylinder shaft 5.
1 will not be rotated.

At the initial stage of drawing out the blind 2 described above, the one-way clutch 25 is in the transmission state, so the operating annular body 23, which is pivotally supported by the support shaft 12, is stopped by the resistance of the support shaft 12, and as a result, the operation annular body 23 is stopped due to the resistance of the support shaft 12. Relative rotation is about to occur between the annular body 23 and the roll holder 19. At this time, when the locking roller 20 is in contact with the inner circumferential surface of the locking annular body 21, the state in which it is urged by the above-mentioned relative rotational force is maintained.

On the other hand, although the one-way clutch 29 is free, the lock annular body 21 rotates with a weak rotational force in the opposite direction to the roll holder 19 because the rotation of the cylinder shaft 5 is transmitted due to frictional resistance. Joint part 2
2 faces the locking roller 20 of the roll holder 19, the above-mentioned relative rotation between the operating annular body 23 and the roll holder 19 is allowed, and the circumferential surface of the operating annular body 23 faces the locking roller 20. As a result, the locking roller 20 is pushed out from the roll holder 19, and a portion of the circumferential surface of the locking roller 20 is pushed into the engaging portion 22 of the locking annular body 21, thereby making it possible to lock.

Note that when the locking roller 20 is fitted into the engaging portion 22 of the locking annular body 21, the locking annular body 21 is engaged with the roll holder 1 due to the engagement of the locking roller 20.
It will rotate together with 9.

After the operation annular body 23 operates in the lockable state as described above, the support shaft 12 is moved by the rotation restriction structure 31, that is, by the pin 32 of the restriction plate 33.
is in contact with the end of the groove 34 of the second carrier 17 and is regulated, so that the rotational force of the second carrier 17 is transmitted to the support shaft 12, and the one-way clutch 25 of the operating annular body 23 is further transmitted. state, this operating annular body 23 is also rotated, and this operating annular body 23
will rotate together with the roll holder 19.

As a result, the rotation of the drawer of the blind 2 is followed while the aforementioned lockable state is maintained. That is, the second carrier 17, the roll holder 19, the lock annular body 21, the operating annular body 23,
The support shaft 12 rotates together in the direction in which the blind 2 is pulled out.

The one-way clutch 29 of the lock annular body 21 is free with respect to the drawer of the blind 2, and therefore does not impede the above-mentioned rotation.

When the blind 2 is pulled out to a predetermined position and then released, the winding shaft 1 is reversed by the force accumulated in the built-in spring, and the lock annular body 21
Since the one-way clutch 29 is in a transmission state, the winding shaft rotates in the same direction as the winding shaft 1.

On the other hand, the second carrier 17 interlocking with the sun gear 16 rotates in the opposite direction to the winding shaft 1 due to the interposition of the planetary gear 13, so that the lock annular body 21 and the roll holder 19 rotate in opposite directions. As shown in FIG. 4, the locking roller 20, which has rotated and is already in a lockable state, is bitten by the locking annular body 21 and the roll holder 19, thereby locking the relative rotation of the two.

This lock generates an acting force that causes the planetary gear 13 to revolve in the winding direction, and since the planetary gear 13 is pivotally supported by the first carrier 11 of the rotating shaft 7, it cannot revolve, and as a result,
The winding shaft 1 is locked, and the blind 2 is stopped at a slightly wound position due to the pulled out position.

Note that even if a shock is generated on the lock annular body 21 when the locking roller 20 is engaged and locked, since the spring end 30 of the one-way clutch 29 is formed in a U-shape, this part will absorb the shock. Then, the winding shaft 1 is smoothly stopped.

Furthermore, the amount of rotation of the blind 2 in the winding direction when the blind 2 is stopped is determined by the rotation of the roll holder 19 because the sun gear 16 rotates at an increased speed due to the number of teeth relative to the rotation of the winding shaft 1. As the amount of rotation increases, the rotation amount on the winding shaft 1 side decreases.

Next, when winding up the above-mentioned blind 2, the blind 2 in the stopped state is pulled out once.

In this drawer, the one-side clutch 29 of the lock annular body 21 is free, so the blind 2 can be pulled out, the cylinder shaft 5 is rotated in the drawing direction, and the second carrier 17 and the roll holder 19 are connected to the cylinder shaft 5 ( Alternatively, it is rotated in the opposite direction to the winding shaft 1) to loosen the locking roller 20.

On the other hand, since the one-way clutch 25 is in the transmission state, the operating annular body 23 supported by the support shaft 12 is stopped by the resistance of the supporting shaft 12, and as a result, the operating annular body 23 and the roll holder 19 A relative rotation occurs between the operating annular body 23 and the concave portion 2.
4 can face the locking roller 20 of the roll holder 19.

At this time, since the operating annular body 23 is made of a permanent magnet, the locking roller 20 is attracted to the recess 24, and this roller 20 is housed in the roll holder 19 to release the lock with the locking annular body 21.

In this state, the support shaft 12 is rotated by the rotation regulating structure 3.
1 rotates together with the second carrier 17 in the same manner as described above, so that the above-mentioned unlocked state is maintained.

Then, when the blind 2 that has been pulled out once is released, the winding shaft 1 is reversely rotated, and the one-way clutch 29 of the lock ring 21 is put into a transmission state, causing the winding shaft 1 to rotate together.

On the other hand, the second carrier 17 and roll holder 19 which are interlocked with the sun gear 16 are allowed to rotate relative to the lock annular body 21 because the locking roller 20 is housed in the roll holder 19.
Furthermore, the blind 2 is rotated in the opposite direction to when it is pulled out.

In addition, since the one-way clutch 28 between the third carrier 18 of the operating annular body 21 is in a transmission state, the unlocked positional relationship between the operating annular body 23 and the roll holder 19 is maintained, that is, rotation is restricted during withdrawal. The structure 31 holds the blind in the unlocked state, and during winding, the one-way clutch 28 is driven to maintain the unlocked state, and the blind 2 is wound up (see FIG. 2).

Further, when the winding shaft 1 is reversed for winding, the one-way clutch 44 of the third carrier 18 becomes in a transmission state, so that the rotation of the sun gear 16 is transmitted to the cylindrical rotating body via the cylindrical shaft 43 and the boss member 42. 41 rotates, relative rotation occurs in opposite directions between the peripheral surface portions of the permanent magnets 40 of the casing 36, and eddy currents are generated on the peripheral surface of the cylindrical rotating body 41, causing mutual rotation. A braking action is applied to the rotation of the winding shaft 1 in the winding direction, the winding shaft 1 is rotated at the winding speed set by the magnets 40, and the blind 2 is rotated in the winding direction. It will be done.

As a result, when the blind 2 is pulled out and released at a desired position, the blind 2 is automatically locked, and when winding the blind 2 is pulled once in the direction in which it is pulled out and released, the blind 2 is wound up. A braking action is applied during removal.

In the above-described embodiment, the operating annular body 23 is entirely made of a permanent magnet, but it may also be constructed by embedding a permanent magnet in the recessed portion 24 of the operating annular body 23. Further, this operating annular body 23 does not necessarily require a permanent magnet; for example, if the locking roller 20 of the roll holder 19 is maintained in an unlocked state facing the recess 24 of the operating annular body 23, the locking annular body 23 can be locked.
1, the locking roller 20 can be stored in the roll holder 19 by the edge of the engaging portion 22, and a storage effect equivalent to that of a magnet can be obtained.

Furthermore, the rotation regulation structure 31 has a pin 3 on the regulation plate 33.
2, but a pin 32 is directly implanted at the position of the support shaft 12 that overlaps with the second carrier 17, and a notch is made in the carrier 17 between the range that restricts the rotation of the pin 32. It can also be configured as follows.

Further, although the one-way clutches 25 and 29 are constructed of spring clutches, they may be of other constructions.

Furthermore, although the above-described embodiments have been described with respect to a roll blind, the present invention can be used in other screen winding devices.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, and FIG. 1 is a cross-sectional side view of a blind winding device. Figure 2 is the first
A sectional view taken along line A-A in the figure. Figure 3 is an enlarged plan view of the main parts. FIG. 4 is a sectional view showing the locked state. DESCRIPTION OF SYMBOLS 1... Winding shaft, 2... Blind, 5... Cylindrical shaft, 7... Fixed shaft, 11... First carrier, 1
2... Support shaft, 13... Planetary gear, 15...
...Internal gear, 16...Sun gear, 1
7... Second carrier, 18... Third carrier, 19... Roll holder, 20... Lock roller, 21... Lock annular body, 22... Engaging portion,
23... Operating annular body, 24... Recessed portion, 25,2
8, 29... One-way clutch, 31... Rotation regulating structure, 39... Spring.

Claims (1)

[Claims] 1. By pulling out the screen wound around the winding shaft, acting force is accumulated in the built-in spring, and during winding, the winding shaft is rotated by the acting force accumulated in the spring. A screen winding device for winding a screen by rotating a screen, in which a first carrier is connected to the inner end side of a fixed shaft having a fixed outer end, and a support shaft is provided at the center of the shaft to provide resistance to rotation. A planetary gear is pivotally supported on the first carrier, a cylindrical shaft formed with an internal gear that meshes with the planetary gear is bearing on the fixed shaft, and the cylindrical shaft is supported on the winding shaft. A sun gear that meshes with the planetary gear is supported on the support shaft, a second carrier is connected to the inner end of the sun gear, and a third carrier is provided opposite to the second carrier, A roll holder holding a locking roller so as to be able to move in and out in the radial direction is fixed between these opposing sides, and a lock annular body is provided on the outer periphery of the roll holder with an engaging portion with which the locking roller engages. An operating annular body for operating the locking roller in and out is provided on the inner periphery of the roll holder, and this is pivotally supported on the support shaft via a one-way clutch that is in a transmission state when the screen is rotated in the pull-out direction. A one-way clutch is interposed between the outer circumferential surface of the shaft of the operating annular body and the inner circumferential surface of the shaft of the third carrier, and the one-way clutch becomes a transmission state when the screen is rotated in the winding direction; A one-way clutch is interposed between the outer circumferential surface of the shaft and the cylindrical shaft, and a one-way clutch that becomes a transmission state when the screen is rotated in the winding direction, and an operating annular body is provided between the support shaft and the second carrier for locking and locking. A screen winding device equipped with a rotation restriction structure that allows relative rotation within the rotation range required for release.