JPH017838Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is applicable to curtains, blinds,
For more details regarding the screen winding device that winds various screens such as lightweight shutters and projection screens onto the winding shaft, and also pulls out and tensions them, please see below.
A screen winding device in which a spring is built into the winding shaft, and when the screen is pulled out, acting force is accumulated on the spring, and the screen is wound by reversing the winding shaft by the acting force of the accumulated spring. Regarding.

(b) Prior art When winding up a stretched screen in the above-mentioned screen winding device, if the acting force accumulated in the spring is large, the screen will suddenly wind up when the screen is unlocked and released. Taken,
When the free end of the screen comes into contact with the stopper at the end of winding, a large impact is generated.

Conventionally, in order to prevent the sudden winding mentioned above,
A winding braking device is disclosed in Japanese Utility Model Application Publication No. 56-109397.

This conventional device houses a viscous damper inside the winding cylinder, which rotates in accordance with the winding cylinder of the screen, and applies braking to slow down the winding speed of the screen.

(c) Problems to be solved by the invention The viscous damper of the conventional device described above directly brakes the rotation of the winding cylinder of the screen, so there are restrictions on its installation. It is difficult to install an automatic locking device that automatically locks the screen in the pulled-out position when the screen is pulled out, and the viscous damper becomes large.

The object of this invention is to provide a screen winding device which solves the above-mentioned problems, has no other restrictions on the attachment of the brake part, and can have a small and compact brake part structure.

(d) Means for solving the problem This invention is a screen winding method in which the screen is wound around the winding shaft by the force of a built-in spring, and the screen is pulled out and stretched against the force of the spring. In the winding device, a braking shaft is connected to the winding shaft via a one-way clutch that transmits power in the winding direction of the screen, a sun gear is formed on the braking shaft, and an outer peripheral portion of the sun gear is connected to the winding shaft. is provided with an internal gear that interlocks with the winding shaft, a planetary gear is positioned between the sun gear and the internal gear, a braking peripheral surface is formed at the end of the braking shaft, and a braking peripheral surface is formed on the braking peripheral surface. It is a screen winding device in which a cylindrical body is provided oppositely, the planetary gear is pivotally supported on the side surface of the cylindrical body, and a highly viscous braking medium is filled in the opposing surface between the cylindrical body and the braking peripheral surface. Features.

(E) Function According to the screen winding device of this invention, in a planetary gear mechanism constituted by a sun gear, an internal gear, a planetary gear, and a cylindrical body, braking is performed at the end of the braking shaft to which the sun gear is connected. A relative movement is obtained between the circumferential surface and the cylindrical body on which the planetary gear is mounted, and a damping effect is provided by means of a damping medium located therebetween, which damping is applied during winding up of the screen by means of a one-way clutch.

(f) Effects of the invention As a result of the above, according to this invention, the braking part can be formed inside the structure of the planetary gear mechanism, and the braking part can be formed at a position not directly related to the winding shaft. This makes it easy to install the device in parallel with an automatic locking device or with other mechanisms.

Moreover, since the braking section can be formed inside the planetary gear mechanism, the braking section and the one-way clutch that is activated during winding can be assembled in one place, making it possible to make them small and compact.

(G) Embodiment An embodiment of this invention will be described below in detail based on the drawings.

The drawings show a roll blind for sun protection and light protection as an example of a screen winding device, and in FIGS. 1 to 4, a winding shaft 1 formed in a cylindrical shape has a spring (not shown) on 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,
Acting force is accumulated in the above-mentioned spring, and when the blind 2 is wound up, it is wound up by the accumulated acting 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.

End of the winding shaft 1 mentioned above (side without built-in spring)
An inner tube 3 made of a rubber material and a cylindrical casing 4 are integrally inserted into the casing 4, and a female screw 5 is carved on the inner wall surface of the outer end of the casing 4.
The male screw 7 of the rotating cylinder shaft 6 is screwed into this, and by fixing each other with a locking screw, the rotating cylinder shaft 6
is integrally connected and fixed to the winding shaft 1 via the inner tube 3 and the casing 4.

Note that an O-ring 10 is interposed between the inner end of the rotary cylinder shaft 6 and the inner step 9 of the casing 4 for sealing.

The above-mentioned rotating cylinder shaft 6 has a cylindrical inner end,
A fixed shaft 11 is concentrically inserted into the center of the outer end side via a bearing member 12 so as to be relatively rotatable.

The outer end of the above-mentioned fixed shaft 1 is inserted into the mounting part 14 formed in the mounting member 13 as a half-moon-shaped hole, and is mounted in a fixed rotation state, and the mounting member 13 is used to mount the roll blind. It is fixed to a suitable fixed wall.

A ratchet gear 15 is formed on the circumferential surface of the aforementioned fixed shaft 11 and meshes with one direction of the winding direction X of the blind 2, and a carrier 16 is formed on the inner end.
A plurality of planetary gears 17 are supported on the inner end surface of the carrier 16 by a shaft 18 formed on the same circumference.

A sun gear 19 that meshes with the planetary gear 17 is provided on the inside of the planetary gear 17, and an internal gear 20 that meshes with the planetary gear 17 is provided on the outside.

A ring-shaped cam ring body 21 is interposed between the internal gear 20 and the rotary cylinder shaft 6 that face each other on their sides, and the inner wall surface of the rotary cylinder shaft 6 controls the rotation and the axis. Ratchet gears 22 and 23 are formed on both sides of the internal gear 20 so as to be slidable in this direction, and are symmetrical and mesh in one direction, Y, in which the blind 2 is pulled out.

On the other hand, ratchet gears 24 and 25 that mesh with the same number of teeth as the ratchet gears 22 and 23 of the cam wheel body 21 are respectively provided on the internal gear 20 and the rotating barrel shaft 6 that face the respective side surfaces of the cam wheel body 21. It is formed.

The above-mentioned internal gear 20 is biased toward the rotating barrel shaft 6 by a spring 27 via a contact plate 26, and the internal gear 20, the cam wheel body 21,
Each of the ratchet gears 22 to 25 of the rotary cylinder shaft 6 absorbs the amount of slippage and sliding in the axial direction and returns to its original state.

Further, a protrusion 28 for preventing rotation is provided on the outer circumferential surface of the internal gear 20, and the above-mentioned protrusion 28 is fitted into the rotary cylinder shaft 6, and the ratchet gear 2
A regulating recess 29 is formed that allows relative movement of 2 to 25 by 1 pitch, and these protrusions 28 and the regulating recess 29 allow rotation of the rotating cylinder shaft 6 and the internal gear 20 by 1 pitch. Rotation is stopped.

A plurality of cams 30 are formed on the inner wall surface of the cam wheel body 21 at every other pitch of the ratchet gears 22 to 25, that is, within a length range of one pitch every two pitches. Between the cam surface of 21 and the ratchet gear 15 of the fixed shaft 11,
A ratchet pawl 31 that engages and disengages from the ratchet gear 15 on the winding direction X side of the blind 2 is positioned, and a support shaft 3 connected to the ratchet pawl 31 is positioned.
2 is pivotally mounted on the aforementioned rotating barrel shaft 6, and a spring 33 urges the ratchet pawl 31 to mesh with the ratchet gear 15.

The above-mentioned cam wheel body 21 is attached to the above-mentioned ratchet pawl 31.
A driven cam piece 34 that is acted on by the cam 30 to disengage the ratchet pawl 31 is connected to the driven cam piece 34.
4 is in a position where the cam 30 is not formed, the ratchet pawl 31 is in mesh with the ratchet gear 15, and the rotation of the rotary cylinder shaft 6 in the winding direction X is locked, and the rotation in the unwinding direction Slip is possible with Y rotation. Further, when the driven cam piece 34 rides on the cam 30, the ratchet pawl 31 disengages from the ratchet gear 15 (releases the lock).
The rotating cylinder shaft 6 can be rotated freely.

The shaft portion 35 of the sun gear 19 is fitted inside the casing 4 and prevented from rotating.
6, and forms a cylindrical portion 37 inside the case 36.

The tip shaft portion 39 of the brake shaft 38 is rotatably fitted into the cylindrical portion 37 described above, and the winding of the blind 2 from the internal gear 20 is inserted between the shaft portion 39 and the cylindrical portion 37. The power transmission state is ON in the drawing direction X side, and the free rotation is OFF in the drawing direction Y side.
A one-way clutch 40 is interposed.

The one-way clutch 40 described above consists of a collar 41 fixed to the tip shaft portion 39 of the brake shaft 38 and a spring 42 wound around the collar, one end of the spring 42 being locked to the cylindrical portion 37 and the other The edges are free. Note that this one-way clutch 40 may be constructed of another one-way clutch, such as a one-way clutch using a hole.

A sun gear 43 is formed in the middle of the brake shaft 38, and is meshed with an internal gear 45 formed on the inner wall of the case 36 via a planetary gear 44.

Further, a brake conical surface 46 that receives a braking action is formed on the inner end side of the brake shaft 38, and a brake peripheral surface 47 is formed on the outer peripheral surface of the brake conical surface 46, and a cylindrical body 48 as an example of a brake body is coated on the brake peripheral surface 47. The aforementioned planetary gear 44 is pivotally supported by a shaft 49 formed on the side surface of this cylindrical body 48.

When the above-mentioned brake shaft 38 rotates, the sun gear 43
The planetary gear 44 is rotated through the rotation, and along with this rotation, the cylindrical body 48 is also rotated in a decelerated state with respect to the brake shaft 38, and there is a gap between the brake peripheral surface 47 and the inner wall surface of the cylindrical body 48. , a relative rotation occurs. Therefore, by filling this space with a highly viscous braking medium, such as grease, the relative rotation between the braking peripheral surface 47 and the inner wall surface of the cylindrical body 48 can be damped.

A conical body 50 as an example of a brake body formed in the same taper is in contact with the brake conical surface 46 of the brake shaft 38 mentioned above, and the inner end of this conical body 50 is fixed to the cap 52 with a screw 51. ing. The cap 52 described above has a female thread 53 carved on the inner wall surface and is screwed into a male thread 54 carved on the outer peripheral surface of the inner end of the casing 4.
The appropriate braking pressure is set by adjusting the contact pressure of the brake.

When the brake shaft 38 rotates, since the cone 50 is fixed to the casing 4, relative rotation occurs between the brake cone surface 46 and the cone 50.
The braking pressure of the cone 50 can apply braking to the braking cone surface 46 .

As a result, braking is applied to the braking shaft 38 at two locations, the braking conical surface 46 and the braking circumferential surface 47, and this braking acts in the winding direction X of the winding shaft 1, causing rapid winding of the blind 2. In the drawing direction Y, there is no power transmission due to the intervention of the one-way clutch 40, so no braking is applied.

In the figure, 55 is an O-ring, and 56 is a spring, and this spring 56 absorbs the gap caused by the meshing of the male screw 54 and the female screw 53.

The operation of the roll blind constructed in this way will be explained next.

When the blind 2 is wound around the winding shaft 1, the protrusion 28 of the internal gear 20 comes into contact with the side surface of the regulating recess 29 of the rotation cylinder shaft 6 on the pull-out direction Y side, as shown in FIG. It hit and stopped.

When the above-mentioned blind 2 is pulled out and the take-up shaft 1 is rotated in the pulling direction, the rotating cylinder shaft 6 is also rotated in the same direction.

At the same time, the rotation of the winding shaft 1 in the drawing direction Y is controlled by the braking shaft 38 via the casing 4, the case 36, the internal gear 45, the planetary gear 44, and the sun gear 43.
or via the casing 4 and the cone 50 to the brake shaft 38.

The rotation of the one-way clutch 40 in the pull-out direction Y from the brake shaft 38 side is in the slip direction, but is transmitted to the cylindrical portion 37 of the sun gear 19 due to contact frictional resistance. For this purpose, this sun gear 19 is rotated in the drawing direction Y. Note that this rotation is possible because the load on the internal gear 20 is light while the rotation is allowed.

Since the above-mentioned rotation of the sun gear 19 in the drawing direction is via the planetary gear 17, the rotation direction is reversed and transmitted to the internal gear 20 as a rotational force in the winding direction X. Moreover, this internal gear 20 Since the ratchet gear 24 is allowed to rotate by one pitch between the regulating recess 29 and the protrusion 28, the load is light, and therefore the ratchet gear 24 is rotated in the winding direction by this allowable rotation.

In the above-mentioned rotation, the cam wheel body 21 and the rotating cylinder shaft 6 are rotated so that the ratchet gears 23 and 25 are in the drawing direction Y.
Since they are in mesh with each other, there is no relative rotation between them, but the cam wheel body 21 and internal gear 20 are
Since the internal gear 20 is reversed in the winding direction, the mutual ratchet gears 22 and 24 are in the slip direction, and relative rotation occurs between them.
Moreover, since the amount is equivalent to one pitch of the ratchet gears 22 and 24, a ratchet feed of one pitch is generated between the cam wheel body 21 and the internal gear 20.

When the aforementioned protrusion 28 of the internal gear 20 is regulated by the restriction recess 29 of the rotation cylinder shaft 6, the internal gear 20 rotates together with the rotation cylinder shaft 6 due to this restriction, and is not allowed to be drawn out in the subsequent blind drawer. On the other hand, the sun gear 19 is rotated by power transmission from the internal gear 20 side, and its speed is increased.

Next, when the blind 2 is reversely rotated in the winding direction X by the acting force of the spring built into the winding shaft, the rotary cylinder shaft 6 and the sun gear 19 rotate in the same winding direction X, as described above. However, while the internal gear 20 is allowed to rotate in the regulating recess 29, its rotational direction is reversed to the pull-out direction Y, and the internal gear 20 rotates by one pitch of the ratchet gear 24, which is allowed to rotate.

In this rotation, the cam wheel body 21 and the internal gear 20 are mutually connected to the ratchet gears 22, 2.
4 are meshed in the drawing direction Y, so there is no relative rotation, but the cam ring body 21 and the rotating barrel shaft 6 do not latchet because the rotating barrel shaft 6 rotates in the winding direction. The gears 23 and 25 are in the slip direction and relative rotation occurs, and the amount of relative rotation is the amount that the rotation of the internal gear 20 is allowed, that is, one pitch of the ratchet gears 23 and 25, so that the cam wheel A ratchet feed of one pitch is generated between the body 21 and the rotating cylinder shaft 6.

The aforementioned rotation of the internal gear 20 causes the protrusion 2
8 is regulated by the regulating recess 29 and prevented from rotating, this internal gear 20 rotates together with the rotation cylinder shaft 6 in the winding direction X, and is used for subsequent winding of the blind 2. On the other hand, the sun gear 19 is rotated by power transmission from the internal gear 20 side.

The aforementioned ratchet feed between the cam wheel body 21 and the rotating cylinder shaft 6 results in one cam feed occurring between the cam 30 of the cam wheel body 21 and the driven cam piece 34 of the ratchet pawl 31. Moreover, since the cams 30 are provided at every other pitch of the ratchet gears 22 and 23 of the cam wheel body 21, if the driven cam piece 34 is in contact with the cam 30 in the initial state, the cam 30
If the driven cam piece 34 is not in contact with the cam 30, the cam 30 is cam fed to a position where the driven cam piece 34 is not in contact with the cam 30.

As a result, the ratchet pawl 31 connected to the driven cam piece 34 is operated to a position where it engages with the ratchet gear 15 of the fixed shaft 11 (locked) or a position where it disengages (unlocked).

As a result of these operations, ratchet feed occurs on the internal gear 20 side of the cam wheel body 21 at the beginning of pulling out the blind 2, and ratchet feed occurs on the rotating cylinder shaft 6 side of the cam wheel body 21 at the beginning of the winding of the blind 2. At the same time, the cam ring body 21 is fed once, and the ratchet feeding operation that makes one set of these drawer windings is performed twice, thereby completing one cycle of locking and unlocking of the blind 2. It is done. This locking and unlocking are repeated alternately.

In the initial state in which the blind 2 is completely wound up on the winding shaft 1 described above, the ratchet gear 1 of the fixed shaft 11
5 and the ratchet pawl 31 of the rotary cylinder shaft 6 are set to unlock when they are disengaged from each other, and if the blind 2 is pulled out and released at an arbitrary position, the ratchet feed will occur once at the beginning of the drawer, and then the blind will be released again. At the same time as the second ratchet feed occurs at the beginning of the reversal that occurs, one cam feed is performed, and the blind 2 is locked by this cam feed. That is, the blind 2 is locked at the beginning of the reverse rotation when released, and is stopped and stretched at the released position.

In the above-described drawing of the blind 2, the sun gear 19 is also rotated in the direction corresponding to the drawing of the blind 2 as the internal gear 20 rotates together with the rotation barrel shaft 6, but the one-way clutch 40
Since is in the OFF direction, no power is transmitted to the brake shaft 38 and no braking action is performed.

Next, when winding up the blind 2 from the tensioned position, if the blind 2 is pulled out once in the drawing direction Y and then released, the ratchet feed will occur once at the beginning of the drawing as described above, and then the reversal (winding) will occur. At the beginning (rotation in direction
The blind 2 is disengaged from the ratchet gear 15 of No. 1, the lock is released, and the blind 2 is wound up by the force of the spring built into the winding shaft 1.

In the above-mentioned winding, when the internal gear 20 rotates in the winding direction X together with the rotary cylinder shaft 6 and the sun gear 19 also rotates in the same direction, the one-way clutch 40 is in the ON direction. The brake shaft 38 is rotated at increased speed.

Since the above-mentioned braking shaft 38 receives braking action at two places, the braking conical surface 46 and the braking circumferential surface 47, this braking action applies braking to the rotation of the winding shaft 1 in the winding direction The rapid winding of the blind 2 due to the acting force is controlled, and the blind 2 is wound up at a set winding speed.

In addition, although the above-mentioned embodiment explained the roll blind, this invention can also be used for other screen winding devices.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and FIG. 1 is a partially cutaway sectional side view of a roll blind. FIG. 2 is a sectional view taken along line A-A in FIG. 1. FIG. 3 is a sectional view taken along line B-B in FIG. 1. FIG. 4 is a partially exploded view of the cam wheel portion. 1... Winding shaft, 2... Blind, 38... Braking shaft, 40... One clutch, 43... Sun gear, 44... Planet gear, 45... Internal gear, 47... Braking peripheral surface, 48... Cylindrical body.

Claims (1)

[Claims for Utility Model Registration] A screen winding device that winds up a screen on a winding shaft by the action of a built-in spring, and pulls out and tensions the screen against the action of the spring, comprising: A braking shaft is connected to the winding shaft via a one-way clutch that transmits power in the winding direction of the screen, a sun gear is formed on the braking shaft, and an outer peripheral portion of the sun gear is interlocked with the winding shaft. a planetary gear is positioned between the sun gear and the internal gear, a braking circumferential surface is formed at an end of the braking shaft, and a cylindrical body is provided opposite to the braking circumferential surface. A screen winding device characterized in that the planetary gear is pivotally supported on a side surface of the cylindrical body, and a highly viscous braking medium is filled in a surface facing the cylindrical body and a braking peripheral surface.