JPS60195287A - Self-lock mechanism of screen wind-up apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a screen that is used by rolling up and storing various screens such as curtains, blinds, lightweight shutters, tents, and projection screens, or by rolling them back and unfolding them. This relates to the self-locking timing of the winding device.

(B) Background of the Invention Normally, 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 screen in its stopped position, and this braking action is linked to the rotation stopping operation of the motor to prevent the screen from slipping due to its own weight.

However, in 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 instantaneously due to the inertia of this motor.

(c) Purpose of the Invention Therefore, the present invention provides 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) Summary of the Invention In this invention, the motor itself is unlocked by using the starting reaction force when the motor is started, and the rotation of the outer rotor is restricted by the pressure of the spring when the motor is OFF. The present invention is characterized by a self-locking mechanism for a screen winding device that utilizes the self-reaction force of the motor, which can instantly lock the motor itself.

(e) Effects of the invention According to the invention, the above-described connection between the stator, which rotates slightly in conjunction with the starting reaction force of the motor, and the brake wheel, which is biased and opposed to the outer rotor via the brake member, is The cam structure consists of a driving cam and a driven cam that converts the slight (6) rotational force of the stator into axial sliding force.The cam is designed to separate and unlock when the motor is started, so it is normally in the locked state. The lock will be released at the same time as the motor starts.

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 winding position of the screen is changed. The deployed position is 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 lowering, 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 boiler is also reduced at the same time, and the rotor and brake wheel via the brake member are The distance between the rotor and the rotor is narrowed, allowing the rotor to rotate 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 the optimal rotation state against the screen's own weight due to the braking action on the rotor, and the gradual downward regulation state is achieved. The screen can be expanded and used very smoothly.

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

Furthermore, a motor, a planetary gear reduction mechanism, and a self-locking mechanism are installed in the hollow interior of the winding shaft formed in the cylindrical body.
Since one structure is installed internally, the outer end of the winding shaft does not become large, and the winding shaft can be extended in the axial direction and used effectively. The effective usable width of Besclean can be sufficiently long, and the entire installation space can be used efficiently without wasting space.

(f) Examples of the invention An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows, as an example of the screen winding device, a winding device for a roll blind that provides sun protection and light protection.
In the figure, a roll blind winding device 1 includes a winding shaft 2 equipped with a blind, a drive section 3 thereof, a speed reduction mechanism section 4, and a self-locking mechanism section 5.

The above-mentioned winding shaft 2 has a reinforcing outer cylinder 7 on a long inner cylinder 6.
The drive mechanism is installed inside the hollow part of this shaft 2, and a mounting member (in the drawings) for attaching this shaft 2 to a wall is provided at both ends. (omitted) is equipped.

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 the inner end ( (right side in the figure) is the winding shaft 2
The inner end of this support shaft 8 is held by a bearing 9, and each side Ia with respect to the winding shaft 2, which will be described later, is provided on this support shaft 8.

The aforementioned drive unit 3 is an outer rotor type forward/reverse motor 1.
0, this forward/reverse motor 10 has a support shaft 8
A long stator f11 that is allowed to rotate slightly is fitted onto the shaft on the inner end side of the stator shaft 11, and a stator 12 is integrally fixed to the stator shaft 11. In order for the outer rotor 13 to rotate, both ends of the rotor 13 are pivotally supported on the 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 that is biased by a spring 16 as a locking member that locks the rotation of the rotor 13, and a lock release member that releases the locked state. Drive cam 1 as
8 and a driven cam 19, the brake wheel 17 is formed in a cylindrical shape, and its outer end surface is urged against the inner end surface of the rotor 13 to regulate the rotation of the rotor 13. 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 rotor 13 facing the rotor 17, and the resistance of the contact surface during locking is increased to obtain an efficient locking action. That's what I do.

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 and held in a slightly compressed state.

As a result, the biasing pressure of the spring 16 always sets the brake boil 17 to the side of the rotor 13 with the bearing number 9 as a base point. Further, in this case, the spring pressure is set to be weaker than the sliding force generated by the activation 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 its axial position is regulated by locking the inner end surface of the bearing 9 with a retaining ring 24 via a flat washer 23. .

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 constantly guided by the slide. In this state, a stable sliding action can be obtained when sliding.

The aforementioned driving cam 18 has a cylindrical shape and is connected to the suator shaft 11.
The inner end surface of this cam 18 has a drive cam surface 27 symmetrical in the circumferential direction that is inclined in the circumferential direction. The auxiliary cam 1q is placed on the side and the driven cam 19 is inserted onto the rotation regulating shaft 29 which is externally fitted onto the support shaft 8 via a key 28 and is allowed to slide in the axial direction. The driving cam surface 30 has a driven cam surface 30 that corresponds in unevenness to the driving cam surface 27 on the surface opposite to the driving cam surface 27 described above.

This driven cam 19 is inserted into the inner circumferential surface of the brake wheel 17 described above in a direction opposite to the wheel biasing force, and the outer circumferential step portion 31 formed on the outer circumferential surface of the driven cam 19 is inserted into the inner circumferential surface of the brake wheel 17. The thrust balls 33 are interlocked with each other in the axial direction and are opposed to each other in the formed inner circumferential step portion 32 through thrust balls 33 .

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

The support shaft 8 is provided in the hollow interior of the support shaft 8 described above.
A lead wire 36 for motor wiring inserted from the outer end side to the inner motor position and the capacitor position is connected, and the forward/reverse rotation motor 10 is controlled to turn ON/OFF.

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 multi-stage planetary gear speed reduction mechanism 37 that is small and can obtain high output and is arranged in series on the support shaft 8, and the above-mentioned outer rotor 13 is A first sun gear 38 that is integrally connected to the outer end and rotates, a first planetary gear 39 that meshes with the first sun gear 38, and a revolution output of the first planetary gear 39 is transmitted to a planetary gear reduction mechanism (not shown) in the subsequent stage. ), the first carrier 40 conducts to
The motor output is transmitted 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 in which the locking action of the self-locking structure 5 is activated when the motor 10 is in the 0FFU state, that is, the spring 16
The rotor 13 is in a rotation restricted state in which the rotor 13 is locked by the biasing action of the brake wheel 17 and the brake member 20 in contact with each other via the rotor 13.

Then, when an ON signal is input to this motor 10,
The stator 12 receives the starting reaction force of the outer rotor 13.
Then, the stator shaft 11 rotates a small amount in the opposite direction, and the drive cam 18, which is integral with the stator shaft 11, rotates a small amount in the same direction. At this time, the cam surfaces 27 and 30 of the drive cam 19 and the driven cam 19 press against each other due to the slight rotation of the drive cam 18, so that the driven cam 19 is slid in the axial direction with the drive cam 18 as a reference point.

As a result, the driven cam 19 and the corresponding brake wheel 17
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 the rotor 13 is automatically unlocked and the motor 10 rotates in forward and reverse directions. will be activated.

As a result, the motor output is reduced to a predetermined rotational force via the planetary gear reduction mechanism 37, and the rotational force is transmitted to the winding shaft 2, which winds up the blind with the predetermined rotational force. or unfolded and moved to a predetermined setting position.

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 stopping action of the rotor 13, rotates slightly in the opposite direction to the one at the time of startup in order to return to its original position. Accordingly, the drive cam 18 integrated 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 boiler 17 instantaneously slides back to its original return position where it comes into biased contact with the brake member 20 again, so the rotor 13 is automatically locked and the rotational operation of the motor 10 is instantaneously stopped.

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

By the way, when the blind is lowered, since the rotational load on the motor 10 is small due to the weight of the blind, the sliding force on the brake wheel 17 is also reduced, and the distance between the brake member 20 and the brake boiler 17 is reduced. By narrowing, the so-called opening shaft 2, which makes light contact with the blind, is in a rotating state against the weight of the blind, and is deployed and used in a manner suitable for the lowering operation.

Conversely, when the blind is raised, the brake member 20 and the brake wheel 17 are maintained in an unlocked state with a sufficient distance between them due to the increased load on the motor 10.

In addition, in response to the motor reaction force when the motor 10 is started, the support shaft 8 is
In order to absorb the reaction force of the motor which is transmitted to the external winding shaft 2 in order to disperse the reaction force applied to the winding shaft 2, the absorption process is performed naturally.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view of the 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 Axis 12・
... Stator 13 ... Outer rotor 16 ... Spring 17 ... Brake boil 18 ... Drive cam 19 ... Followed cam 20 ... Brake member 37 ... Planetary gear reduction m4N

Claims (1)

[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
The motor is installed in a state that allows a slight rotation in the opposite direction to the rotor in response to the starting reaction force of the motor, and a drive cam that rotates a small amount integrally with the stator is fixed to the end of the stator. A brake wheel that is allowed to slide in the axial direction via a rotationally restricted driven cam is provided on the opposing surface of the rotor. A brake member having a large friction coefficient is attached to at least one end face of the surface, and the brake wheel is moved to the lock release side against the urging force of the spring based on the reverse rotation movement of the stator linked to the starting reaction force of the motor. A self-locking mechanism of a screen winding device configured to separate from the screen.