JPH0340795B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to various screens such as curtains, blinds, lightweight shutters, tents, and projection screens, which are rolled up and stored or rewound and used for unfolding. This invention relates to a self-locking mechanism for a winding device.

(B) Background of the Invention Usually, this type of screen winding device drives a winding shaft that winds up the screen by a motor via a speed reduction mechanism, and the winding or unfolded screen is thereby driven by a motor via a speed reduction mechanism. An electromagnetic brake is used to lock the motor in its stopped position.
By interlocking this braking action with the rotation stop operation of the motor, the screen is prevented from slipping off due to its own weight.

However, in the case of such a screen winding device, it is necessary to install an electromagnetic brake mechanism in addition to the motor and its deceleration mechanism, and not only does the entire device equipped with these become bulky, but the motor Even if the screen was turned OFF, the screen could not be stopped instantly due to the inertia of this motor.

(c) Object of the Invention Therefore, the object of the present invention is to provide a self-locking mechanism for a screen winding device that can instantly stop the screen without requiring a large brake mechanism such as an electromagnetic brake.

(d) Structure of the Invention This invention has a support shaft inserted into the winding shaft, and a stator of an outer rotor type motor to be mounted on the support shaft that is opposite to the rotor in response to the starting reaction force of the motor. A drive cam that rotates a small amount integrally with the stator is fixed to the end of the stator, and a driven cam whose rotation is restricted is fixed to the end of the stator. A brake wheel that is allowed to slide in the axial direction via a cam is disposed in opposition, and the brake wheel is biased against the end surface of the rotor by a spring, and at least one end surface of the biasing surface has a large coefficient of friction. A self-locking screen winding device equipped with a brake member and configured to separate the brake wheel to the lock release side against the biasing force of a spring based on the reverse rotation of the stator linked to the starting reaction force of the motor. It is characterized by being a mechanism.

(e) Effects of the Invention According to the present invention, the above-mentioned arrangement is possible between the stator, which rotates slightly in conjunction with the starting reaction force of the motor, and the brake wheel, which is urged against the outer rotor via the brake member. The cam structure consists of a driving cam and a driven cam, which converts a small amount of rotational force of the stator into axial sliding force.The cam is separated and unlocked when the motor is started, so it is normally in a locked state and the motor The lock will be released at the same time as the start.

Therefore, as soon as the motor is started, the lock is automatically released and the motor output is transmitted to the winding shaft, and as soon as the motor output is stopped, the rotation of the winding shaft is locked and the screen is wound. The position and deployment position are automatically locked.

In particular, when the motor is stopped, an instantaneous stop regulating action of the rotor corresponding to the stopping action of the motor is obtained, so that the stopping action of the winding shaft becomes extremely fast.

Furthermore, when the screen is lowered, the rotational load on the motor is small due to the weight of the screen that is unfolding and descending, so the sliding force on the brake wheel is also reduced, and the rotor and brake wheel via the brake member are The distance between the rotor and the rotor is narrowed, and the rotor rotates in a braking state that corresponds to light contact. Therefore, the rotor rotates while being subjected to a constant load, and when the screen descends, the winding shaft is in an optimal rotational state against the screen's own weight due to the braking action on the rotor, and the gradual descent is controlled. The screen can be smoothly expanded and used under certain conditions.

In particular, this self-locking mechanism has a simple structure in which locking and unlocking functions can be obtained by simply providing a brake wheel and a brake member via a cam mechanism that slides in conjunction with the starting reaction force of the motor, so it requires fewer components. It can be manufactured at low cost.

Furthermore, since the motor, planetary gear reduction mechanism, and self-lock mechanism are installed inside the hollow interior of the winding shaft formed in the cylindrical body, the outer end of the winding shaft does not become large. This means that the winding shaft can be extended in the axial direction and used more effectively, allowing for a sufficiently longer effective width of the screen compared to current winding devices. Can be used efficiently.

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

The drawing shows, as an example of a screen winding device, a winding device for a roll blind that provides sun protection and light protection. In FIG. It includes a drive section 3, a deceleration mechanism section 4, and a self-lock mechanism section 5.

The winding shaft 2 described above is formed into a double tube in which a reinforcing outer cylinder 7 is integrally fitted and fixed onto a long inner cylinder 6, and a drive mechanism is installed inside the hollow interior of this shaft 2. Attachment members (not shown) are provided at both ends for attaching the shaft 2 to a wall surface.

Inside the winding shaft 2, the outer end of a support shaft 8, which is a long small-diameter tube shaft, is fixed outside one open end of the winding shaft 2, and this inner end ( (right side in the figure) is inserted concentrically inside the winding shaft 2, and the inner end of this support shaft 8 is held by a bearing 9. Equipped with a mechanism.

The aforementioned drive unit 3 is constituted by an outer rotor type forward/reverse motor 10.
0, a long stator shaft 11 that is allowed to rotate slightly is fitted onto the inner end of the support shaft 8. In other words, although not shown, the stator shaft 11 is attached to the support shaft 8. When the rotation is prevented by a key (not shown), the above-mentioned slight rotation is allowed by forming this rotation with a slight play in the circumferential direction, but the mechanism itself is well known. Therefore, detailed explanation is omitted.

Furthermore, a stator 12 is mounted on the stator shaft 11 mentioned above.
are fixed integrally, and on the outer periphery facing the stator 12, an outer rotor 13 is rotatably supported at both ends thereof on a support shaft 8 via bearings 14 and 15.

Further, a self-locking mechanism 5 and a motor capacitor C are connected to the inner end of the support shaft 8 via the motor 10.

As shown in FIG. 2, the above-mentioned self-locking mechanism section 5 includes a brake wheel 17 which is biased by a spring 16 as a locking member that locks the rotation of the rotor 13, and a release member that releases the locking state. driving cam 18 and driven cam 1
The brake wheel 17 is formed in a cylindrical shape and has an outer end surface urged against the inner end surface of the rotor 13 to restrict rotation of the rotor 13. Rotor 1
A brake member 20 made of a rubber material or the like having a large coefficient of friction is integrally attached to the inner end surface of the locking member 3 to increase the resistance of the contacting surface during locking and to obtain an efficient locking action.

The biasing means for this brake wheel 17 is a coil-shaped spring 16 arranged and biased. One end of the spring 16 is housed in a circumferential groove 21 formed on the inner end surface of the wheel, and the other end is The spring 16 is housed in the circumferential groove 22 formed on the outer end surface of the bearing 9 described above, and the spring 16 is housed and held in a slightly compressed state.

Thereby, the biasing pressure of the spring 16 is provided to always bias the brake wheel 17 toward the rotor 13 with the bearing 9 as a base point. Further, in this case, the spring pressure is set to be weaker than the sliding force generated by the starting reaction force of the motor 10, so that the lock release action can be reliably obtained.

The bearing 9 is rotatably fitted onto the support shaft 8, and the inner end surface of the bearing 9 is locked by a stop shaft 24 via a flat washer 23 to regulate its axial position.

Reference numeral 25 denotes a rotation regulating protrusion of the brake wheel, and a corresponding slide guide groove 26 is carved on the inner circumferential surface of the bearing 9, so that the inner end of the rotation regulating protrusion 25 is always guided by the slide. In this case, a stable sliding action can be obtained during sliding.

The aforementioned driving cam 18 has a cylindrical shape and is integrally fitted and fixed to the inner end of the stator shaft 11 by, for example, fitting a key and a groove. It has an inclined driving cam surface 27 symmetrically in the circumferential direction, and a driven cam 19 is provided on the side facing the driving cam surface 27.
9 is externally inserted onto a rotation regulating shaft 29 which is externally fitted and fixed on the support shaft 8 via a key 28 in a state where it is allowed to slide in the axial direction, and the surface facing the drive cam surface 27 mentioned above is It has a driven cam surface 30 that corresponds in unevenness to the driving cam surface 27 .

This driven cam 19 is connected to the brake wheel 17 mentioned above.
The outer peripheral step 31 formed on the outer peripheral surface of the driven cam 19 thrusts into the inner peripheral step 32 formed on the inner peripheral surface of the brake wheel 17. They are interlocked with each other in the axial direction via balls 33 and are disposed opposite to each other.

34 is a capacitor case, and 35 is a connection terminal thereof.

A lead wire 36 for motor wiring is connected to the hollow interior of the support shaft 8, which is inserted from the outer end of the support shaft 8 inward to the motor position and the capacitor position. teeth
ON/OFF controlled.

As a result, the outer rotor 13 is rotated and stopped, and the output of the outer rotor 13 is transmitted to a deceleration mechanism section, which will be described later, to rotate the winding shaft 2.

The above-mentioned speed reduction mechanism section 4 is constituted by a plurality of small-sized, high-output planetary gear speed reduction mechanisms 37 that are connected to each other on a support shaft 8, and the outer end of the above-mentioned outer rotor 13 is connected to the support shaft 8. A first sun gear 38 that is integrally connected to the side and rotates, a first planetary gear 39 that meshes with the sun gear 38, and a first sun gear that transmits the revolution output of the first planetary gear 39 to a subsequent planetary gear reduction mechanism (not shown). The motor output is transmitted via the carrier 40 to an internal gear 41 that is integrated with the winding shaft 2, and the winding shaft 2 is rotated while being decelerated to a predetermined rotational torque force.

The roll blind winding device configured as described above normally operates in a state where the locking action of the self-locking mechanism section 5 is activated when the motor 10 is OFF, that is, when the brake wheel 1 is closed via the spring 16.
The rotor 13 is locked due to the biasing contact between the rotor 7 and the brake member 20 and is in a rotation restricted state.

Then, when an ON signal is input to this motor 10 and it is rotated in the forward direction, for example, the outer rotor 13 of the motor 10 is rotated by the brake wheel 1.
Since a brake load and other rotational loads are applied to the stator 12, there is resistance at the initial stage of rotation, and in response to this rotational resistance, a starting reaction force in the opposite direction to the above-mentioned normal direction is generated in the stator 12.

The stator 12 and the stator shaft 11 that have received the activation reaction force of the outer rotor 13 rotate slightly in opposite directions, and the drive cam 18 integrated with the stator shaft 11 rotates slightly in the same direction.

At this time, since the driven cam 19 can slide only in the axial direction, the cam surfaces 27 and 30 of the driven cam 19 and the driven cam 19 press against each other as the driving cam 18 slightly rotates, and the driven cam 19 It is slid in the axial direction with the drive cam 18 as the base point.

As a result, the brake wheel 17 corresponding to the driven cam 19 slides slightly in the axial direction against the spring 16 and separates the contact surface between the brake wheel 17 and the brake member 20, so that the rotor 13 is automatically unlocked. As a result, the motor 10 is instantaneously started in forward and reverse directions.

As a result, the motor output is reduced to the planetary gear reduction mechanism 3.
7, the rotational force is reduced to a predetermined rotational force, and the rotational force is transmitted to the winding shaft 2, and the winding shaft 2 winds up or unfolds the blind with the predetermined rotational force to a predetermined setting position. will be moved.

Then, when the blind moves to a predetermined height position and an OFF signal is input to the motor 10, the stator 12, which has received the stop action of the rotor 13, rotates a small amount in the opposite direction to the one at startup to return to its original position. Accordingly, the drive cam 18 integral with the stator shaft 11 rotates a small amount in the same direction, and the driven cam 19 slides back to its original position. As a result, the brake wheel 17 instantly slides back to its original return position where it is in biased contact with the brake member 20 again, so that the rotor 1
3 is automatically locked, and the rotational operation of the motor 10 is stopped instantaneously.

Based on such a motor stopping operation, the winding or unfolding position of the blind is automatically fixed, and the blind can be raised or lowered.

By the way, when the blind is lowered, based on the fact that the rotational load on the motor 10 is small due to the blind's own weight, the sliding force on the brake wheel 17 is also reduced, and the separation distance between the brake member 20 and the brake wheel 17 is reduced. By being narrowed, a control effect is applied to the so-called rotor 13 that lightly contacts the winding shaft 2, so that the winding shaft 2 is in a rotating state against the weight of the blind, and is used for deployment suitable for the lowering operation.

Conversely, when the blind is raised, motor 1
Due to the increase in the load relative to 0, the unlocked state with a sufficient distance between the brake member 20 and the brake wheel 17 is maintained.

In addition, with respect to the motor reaction force when the motor 10 is started, the reaction force applied to the support shaft 8 is transferred to the external winding shaft 2 through a bearing 9 formed by extrapolating the top of the support shaft 8.
It acts as a response to absorbing the motor reaction force that is transmitted in order to be dispersed, so it is naturally absorbed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view of a main part showing a roll blind winding device. FIG. 2 is an exploded perspective view of essential parts of the self-locking mechanism. 1...Roll blind winding device, 2...
Winding shaft, 3... Drive section, 4... Reduction mechanism section, 5
... Self-locking mechanism section, 10 ... Forward/reverse rotation motor, 11 ... Stator shaft, 12 ... Stator, 1
3... Outer rotor, 16... Spring, 1
7... Brake wheel, 18... Drive cam, 19
...Followed cam, 20...Brake member, 37...
Planetary gear reduction mechanism.

Claims (1)

[Scope of Claims] 1. A screen winding device that controls the winding shaft in forward and reverse directions through a forward and reverse motor built into the winding shaft of a cylindrical body and a planetary gear reduction mechanism that reduces the output of this motor. A support shaft is inserted into the inside of the winding shaft, and the stator of the outer rotor type motor to be mounted on the support shaft is allowed to rotate slightly in the opposite direction to the rotor in response to the starting reaction force of the motor. A drive cam that rotates a small amount integrally with the stator is fixed to the end of the stator, and a drive cam that rotates in the axial direction is mounted on the surface facing the drive cam via a driven cam whose rotation is restricted. brake wheels are provided oppositely to each other, and the brake wheels are urged against the rotor end surface by a spring, and a brake member with a large friction coefficient is attached to at least one end surface of the urging contact surface, and the motor A self-locking mechanism for a screen winding device, wherein the brake wheel is separated to the lock release side against the biasing force of a spring based on the reverse rotation of the stator linked to the starting reaction force of the screen winding device.