JPS6340639Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a screen winding device that winds various screens such as curtains, blinds, lightweight shutters, and projection screens onto a winding shaft or pulls them out and stretches them. This is a screen winding method in which a spring is built into the winding shaft, and when the screen is pulled out, the force acting on the spring is accumulated, and the winding of the screen is performed by reversing the winding shaft by the acting force of the accumulated spring. Regarding equipment.

In the above-mentioned screen winding device, when winding up a stretched screen, if the acting force accumulated in the spring is large, when the screen is unlocked and released, the screen will be suddenly wound up.
When the free end of the screen comes into contact with the stopper at the winding end position, a large impact is generated, which has disadvantages such as damaging the screen and damaging the internal mechanism.

In order to prevent the sudden winding described above, if a braking means is interposed between the winding shaft and the fixed shaft, there will be a large resistance when the screen is pulled out, resulting in a heavy drawer.

Therefore, the object of this invention is to provide a screen winding device that is lightweight when the screen is pulled out, and has a braking action when winding up the screen to prevent the blind from being rolled up rapidly.

The screen winding device of this invention is provided with an internal gear interlocked with the winding shaft, a sun gear to which power is transmitted via a planetary gear, and a sun gear connected to the sun gear. A brake shaft is connected via a one-way clutch that transmits power in the winding direction of the screen from Features.

According to this invention, the power from the winding shaft is connected to the braking shaft via the one-way clutch that transmits it in the winding direction of the screen, so the braking action of the braking shaft is only in the winding direction. This allows the blind to be pulled out easily without any resistance, and when winding up, a braking action is activated to prevent sudden winding, ensuring safe winding and preventing damage to the screen or internal mechanism. It can be prevented.

Furthermore, the internal, planetary, and sun gears speed up the rotation of the braking shaft compared to the rotation of the take-up shaft, reducing torque, making it possible to obtain effective braking action even when the braking load on the braking shaft is small. This allows the braking mechanism to be configured compactly.

An embodiment of this invention having such characteristics will be described in detail below based on the drawings.

The drawing shows a roll blind that provides sunshading as an example of a screen winding device.
In Figures to Figure 4, the winding shaft 1 is formed into a cylindrical shape.
has a built-in spring (not shown) at the other end, and a blind 2 is wound around the circumference with one end fixed.
When this blind 2 is pulled out, the acting force is accumulated on 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 thread 5 is cut into the inner wall surface on the outer end side of the casing 4, and a rotating tube is inserted into the inner tube 3. By screwing the male screw 7 of the shaft 6 and fixing each other with a locking screw, the rotary cylinder shaft 6 is integrally connected and fixed to the winding shaft 1 via the inner tube 3 and the casing 4. Ru.

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 with a half-moon-shaped hole, and is mounted in a fixed rotation state. Fixed to an appropriate 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 at the same position where the internal gear 20 and the rotational cylinder shaft 6 face each other on the sides, and a ring-shaped cam wheel body 21 is installed on the inner wall surface of the rotational cylinder shaft 6 to control rotation and 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 pressed against the rotating cylinder shaft 6 side by a spring 27 via a contact plate 26, and the internal gear 20, the cam wheel body 21, and each ratchet gear 22-- of the rotating cylinder shaft 6 25 slips and slides in the axial direction and returns to its original position.

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 the body 21 and the ratchet gear 15 of the fixed shaft 11, a ratchet pawl 31 that engages and disengages from the ratchet gear 15 in the winding direction X side of the blind 2 is located. The installed spindle 3
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 2 is attached to the above-mentioned ratchet pawl 31.
A driven cam piece 34 that is acted on by the first cam 30 to disengage the ratchet pawl 31 is provided in series, and when the driven cam piece 34 is in a position where the cam 30 is not formed, the ratchet pawl 31 engages with the ratchet gear 15. In the meshed state, rotation of the rotary cylinder shaft 6 in the winding direction X is locked, and slippage is possible in rotation in the drawing direction Y. Also, the driven cam piece 34
When it rides on the cam 30, the ratchet pawl 31
The mesh with the ratchet gear 15 is disengaged (unlocked), and the rotary cylinder shaft 6 is free to rotate.

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

The tip shaft portion 39 of the brake shaft 38 is rotatably fitted inside the cylindrical portion 37 described above, and the shaft portion 39
The power transmission state is ON between the internal gear 20 and the cylindrical part 37 in the winding direction X side of the blind 2, and the power transmission state is ON in the winding direction
A one-way clutch 40 that is turned OFF 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. The other end is free. Furthermore, this one-way clutch 40
may also be constructed with other one-way clutches, such as ball-based one-way clutches.

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, on the inner end side of the brake shaft 38, there is a brake cone surface 46 that receives the braking action, and a brake circumferential surface 47 on the outer peripheral surface thereof.
The brake peripheral surface 47 is covered with a cylindrical body 48 as an example of a brake body, and the aforementioned planetary gear 44 is pivotally supported on a shaft 49 formed on the side surface of the 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, it is possible to apply braking to the relative rotation between the braking peripheral surface 47 and the inner wall surface of the cylindrical body 48.

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 described above, and the inner end of this conical body 50 is connected to a cap 52 by a screw 51. Fixed. The cap 52 has a female thread 53 carved on its inner wall surface and is screwed together with a male screw 54 carved on the outer peripheral surface of the inner end of the casing 4, and the conical body 50 is formed by this screwing.
The appropriate braking pressure is set by adjusting the contact pressure.

When the brake shaft 38 rotates, since the cone body 50 is fixed to the casing 4, a relative rotation occurs between the brake cone surface 46 and the cone body 50.
Braking can be applied to the brake cone surface 46 by the braking pressure of the cone body 50.

As a result, braking is applied to the braking shaft 38 at two locations, the braking cone surface 46 and the braking circumferential surface 47, and furthermore,
This braking acts in the winding direction X of the winding shaft 1 to apply a brake to the rapid winding of the blind 2, and in the unwinding direction Y, the transmission of power is prevented by the intervention of the one-way clutch 40. There is no braking provided.

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 described 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, case 36, internal gear 45, planetary gear 44, and sun gear 43.
or to the brake shaft 38 via the casing 4 and the conical body 50.

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 2
0, 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 by this allowable rotation in the winding direction.

In the above-mentioned rotation, the cam wheel body 21 and the rotation 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 and 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 rotating 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 is moved to a position where it does not contact the cam 30. The driven cam piece 3
If the driven cam piece 4 is in contact with the cam 30, the cam is sent to a position where it contacts the cam 30, and if the driven cam piece 34 is not in contact with the cam 30, the cam is sent to a position where it contacts 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 when these drawer windings are set once, the ratchet feeding operation is performed twice, and one cycle of locking and unlocking of the blind 2 is performed. It will be 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, followed by a reverse rotation (in the winding direction). At the beginning (rotation of
When the blind 2 is disengaged from the ratchet gear 15, 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 winding, the internal gear 20
rotates in the winding direction be moved.

Since the above-mentioned braking shaft 38 receives a braking action at two places, the braking cone 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 X. Rapid winding of the blind 2 is controlled by the acting force of the spring, 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 be used for other screen winding devices.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, in which Fig. 1 is a partially cutaway side view of a roll blind, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a sectional view of Fig. 1. FIG. 4 is a partially exploded view of the cam wheel portion. 1... Winding shaft, 2... Blind, 17... Planetary gear, 19... Sun gear, 20... Internal gear, 38... Braking shaft, 40... One-way clutch, 48... Cylindrical body, 50... Cone.

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: An internal gear interlocked with the winding shaft is provided, a sun gear to which power is transmitted via a planetary gear is provided to the internal gear, and power is transmitted from the sun gear in the winding direction of the screen to the sun gear. A screen winding device characterized in that a braking shaft is connected to the winding shaft through a one-way clutch, and a braking body connected to a winding shaft is disposed opposite to the braking shaft while applying braking pressure.