EP3902971B1 - Rotation drive system for a rolling device for a roll-type closure - Google Patents

Description

The present invention relates to a system for driving in rotation a winding member of a closing screen apron which can be rolled up around a central axis.

Conventionally, a roller shutter or door comprises a winding member, such as a winding tube, on which a flexible apron is fixed, such as an apron formed by blades articulated together. An electric motor drives the rotating drum to open or close the shutter or door.

Certain standards in force require the possibility of operating the apron in the event of a power outage.

Disengageable pre-loaded spring systems make it possible to restore the energy stored by the pre-loaded spring to raise the deck. Once the spring has released its energy, the spring must be preloaded again by operating a certain number of turns before resetting the disengageable system.

Known training systems are described, for example, by FR-2 673 236-A1 , FR-2 736 086-A1 , US-5,975,185-A , JP-H11 101 077-A or FR-3 004 745-A3 .

The objective of the invention is to propose a new drive system in which the preload of the spring is obtained simply and precisely.

To this end, the invention relates to a training system according to claim 1.

Thanks to the invention, the preloading of the spring is carried out in disengaged mode in a precise and simple manner, the movable cursor allowing the motor to be stopped once the correct number of revolutions has been reached by the simple detection of a peak of torque resulting from the arrival of the cursor at the stop.

• Le système comprend une bague formant l'élément solidaire de l'arbre principal, fixée à l'arbre de sortie de l'actionneur et à laquelle une première extrémité de la tige filetée est fixée.
• Le système comprend une bague fixée à l'arbre principal et sur laquelle sont fixés le ressort et une seconde extrémité de la tige filetée.
• Le système comprend des formes d'arrêt net prévues de façon complémentaires sur le curseur et sur la bague fixée à la première extrémité de la tige filetée et/ou sur le curseur et sur la bague fixée une seconde extrémité de la tige filetée.
• Le système comprend des moyens d'amortissement de la butée du curseur contre l'élément solidaire de l'arbre principal.
• Le ressort coopère avec un noyau conique.
• Le système comprend un moyen de contrôle adapté pour signaler que le ressort est armé et prêt à fonctionner.
• Le système comprend un système de sécurité permettant d'interdire la manoeuvre du tablier tant que le ressort reste désarmé.
• Le système comprend un moyen de contrôle permettant de prouver que la libération du ressort a fonctionné.
• Le curseur et l'organe d'enroulement présentent une géométrie complémentaire permettant la translation du curseur par rapport à l'organe d'enroulement selon l'axe central du système et le blocage en rotation du curseur par rapport à l'organe d'enroulement selon l'axe central.

According to advantageous but not obligatory aspects of the invention, such a training system can incorporate one or more of the following characteristics, taken in all technically admissible combinations:

• The system comprises a ring forming the element integral with the main shaft, fixed to the output shaft of the actuator and to which a first end of the threaded rod is fixed.
• The system includes a bushing attached to the main shaft and to which the spring and a second end of the threaded rod are attached.
• The system comprises net stop shapes provided in a complementary manner on the slider and on the ring fixed to the first end of the threaded rod and/or on the slider and on the ring fixed to a second end of the threaded rod.
• The system includes means for damping the cursor stop against the element secured to the main shaft.
• The spring cooperates with a conical core.
• The system includes a control means adapted to signal that the spring is cocked and ready to operate.
• The system includes a safety system making it possible to prohibit the operation of the apron as long as the spring remains disarmed.
• The system includes a means of monitoring to prove that the spring release has worked.
• The slider and the winding member have a complementary geometry allowing the translation of the slider relative to the winding member along the central axis of the system and the blocking of rotation of the slider relative to the winding member along the central axis.

• [Fig 1] la figure 1 représente en vue schématique un système d'entrainement conforme à l'invention dans une configuration embrayée ;
• [Fig 2] la figure 2 représente en vue schématique le système d'entrainement de la figure 1 dans une configuration débrayée ;
• [Fig 3] la figure 3 est une vue en perspective du système d'entrainement des figures 1 et 2 ;
• [Fig 4] la figure 4 est une vue à plus grande échelle du détail IV à la figure 3 ;
• [Fig 5] la figure 5 est une vue de côté d'une partie du système d'entrainement dans un état libre d'un ressort du système ;
• [Fig 6] la figure 6 est une vue similaire à la figure 5 dans un état précontraint du ressort.

The invention will be better understood and other advantages thereof will appear more clearly in the following description of a training system conforming to its principle, given by way of non-limiting example with reference to the drawings appended in which :

• [ Figure 1 ] there figure 1 represents in schematic view a drive system according to the invention in an engaged configuration;
• [ Figure 2 ] there figure 2 represents in schematic view the drive system of the figure 1 in a disengaged configuration;
• [ Figure 3 ] there Figure 3 is a perspective view of the training system of figures 1 And 2 ;
• [ Figure 4 ] there Figure 4 is a larger scale view from detail IV to Figure 3 ;
• [ Figure 5 ] there Figure 5 is a side view of a part of the drive system in a state free of a spring of the system;
• [ Figure 6 ] there Figure 6 is a view similar to the Figure 5 in a preloaded state of the spring.

THE figures 1 to 6 represent a drive system 1 comprising an actuator 3 having an output shaft 5. The output shaft 5 defines a central axis winch, etc.

The output shaft 5 is connected to a main shaft 7 of the drive system 1, in such a way that the main shaft 7 is integral in rotation with the output shaft 5.

The drive system 1 comprises a rotating element 9 in pivotal connection with the main shaft 7. The rotating element 9 is fixed axially on the main shaft 7.

The rotating element 9 is integral in rotation with a winding member of a rollable closing screen apron. In the case of a rolling shutter, the rotating element 9 is connected to a winding tube 11 forming the winding member, around which blades of the apron are wound. The winding tube 11 is formed by a hollow cylinder centered on the central axis X and in which the actuator 3, the output shaft 5, the main shaft 7 and the rotating element 9 are mounted.

The drive system 1 comprises a disengageable device 2 which, in an engaged configuration, makes the main shaft 7 and the rotating element 9 integral in rotation, and in a disengaged configuration, disengages in rotation the main shaft 7 and the rotating element 9.

This disengageable device 2 comprises a member 13 movable in translation on the main shaft 7 and relative to the rotating element 9. The member 13 is integral in rotation with the main shaft 7. The main shaft 7 having a profile circular making attachment in rotation by direct assembly impossible, the drive system 1 comprises an intermediate part 15 provided between the main shaft 7 and the member 13. The intermediate part 15 transmits the rotational movements of the actuator 3 to the member 13 leaving it the possibility of translation along the axis X.

The intermediate part 15 has for example a non-circular external profile, complementary to a non-circular profile provided on the inside of the member 13. Thus, the rotation of the intermediate part 15 is transmitted to the member 13, while allowing the relative translation of these two parts.

The disengageable device 2 comprises disengageable connection means provided on the rotating element 9 and the member 13 which allow them to engage or disengage depending on the axial position of the member 13. The rotating element 9 is equipped first rotational coupling means 92, and the member 13 comprises second rotational coupling means 132. The rotational coupling means 92 and 132 are formed by complementary shapes, such as teeth or splines . In this example, the shapes are circumferentially alternating protruding and hollow reliefs visible to the eye. Figure 3 forming, in coupled configuration, stops in rotation. Any other form can be considered.

According to a variant not shown, the first and second rotational coupling means can be formed by a friction clutch system.

In an engaged configuration shown in figure 1 , the coupling means 92 are engaged with the coupling means 132, causing the member 13 to become joined in rotation with the rotating element 9. In a disengaged configuration shown in figure 2 , the coupling means 92 are in a second distant position and are no longer engaged with the coupling means 132, causing a separation in rotation of the member 13 with the rotating element 9. Between the engaged configuration and the disengaged configuration, the member 13 has undergone a translation along the axis X opposite the rotating element 9 between a first close position and a second distant position.

The disengageable device 2 of the drive system 1 comprises elastic means which push the member 13 back into the engaged configuration by default. These elastic means are formed by a compression spring 19, interposed between the member 13 and a flange 152 of the intermediate part 15.

The drive system 1 also includes a control connected to the member 13, and adapted to move the member 13 towards its disengaged configuration, against the force of the spring 19. For example, this control can be provided in the form of a cable 21 operable by a user, and connected to the member 13 by a connecting piece 23. When the cable 21 is pulled, the member 13 is moved away from the rotating element 9, which 'drives towards its disengaged configuration.

The drive system 1 comprises at least one torsion spring 25 which drives the rotating element 9 in rotation around the central axis X such that the apron is driven towards a wound configuration. The purpose of this torsion spring 25 is to provide a restoring torque on the apron towards its wound position in the event of an emergency if the actuator 3 is inoperative.

The torsion spring 25 is interposed between the main shaft 7 and the rotating element 9. In other words, the torsion spring 25 is arranged in series between the actuator 3 and the winding tube 11. actuator 3 drives the main shaft 7, which drives the torsion spring 25, which drives the rotating element 9, which drives the winding tube 11.

The torsion spring 25 comprises a first end 250 fixed to the main shaft 7, and a second end 252 fixed to the rotating element 9. The first end 250 and the second end 252 can be respectively fixed to the main shaft 7 and to the rotating element 9 by any suitable means, for example screws.

To raise the deck, a preload is applied to the torsion spring 25, so that it stores energy and can deliver sufficient torque to raise the deck when the need arises. In the disengaged configuration of the member 13, the spring 25 is able to be preloaded by a relative rotation between the main shaft 7 and the rotating element 9. In other words, in an unloaded or free state, the spring 25 cannot generate a relative rotation of the main shaft 7 and the rotating element 9 , but when rotation between the main shaft 7 and the rotating element 9 is applied, the spring 25 is in a stressed, or pre-stressed, state. In this state, it undergoes an internal stress which tends to exert a relative rotation between the main shaft 7 and the rotating element 9 relative to each other, such that the apron is raised.

The operation of drive system 1 is as follows. In normal operating configuration, the rotating element 9 and the member 13 are in engaged configuration. The torque generated by the actuator 3 is transmitted to the main shaft 7 which transmits it to the member 13 then finally it passes from the member 13 to the rotating element 9 thanks to the disengageable connection means 92 and 132. torque of the actuator 3 is found at the level of the rotating element 9. The previously pre-stressed torsion spring 25 keeps the rotating element 9 under tension which, once released, will be rotated, then will drive the winding tube 11 But as long as the member 13 and the rotating element 9 are engaged, the torsion spring 25 cannot release its energy.

When the cable 21 forming the control is actuated, according to the arrow F1, in emergency operation, the member 13 moves in translation along the axis F2. To do this, it is necessary to apply to the cable 21 a force greater than that of the spring 19 which keeps the member 13 in the engaged position. Then the disengageable connection means are disconnected and the rotating element 9 finds itself free to rotate around the shaft main 7 and is driven by the torsion spring 25 which can now release its energy. The disengaged configuration is reached. The winding tube 11 is then rotated in the direction of winding of the apron.

When we stop operating the cable 21, the spring 19 pushes the member 13 against the rotating element 9 so that the disengageable connecting means couple again. The two ends 250 and 252 of the torsion spring 25 are fixed relative to the main shaft 7, the rotating element 9 can only be set in motion by the actuator 3. We find the engaged configuration.

The drive system 1 has the advantage of being resettable and therefore reusable. In fact, when the disengagement command is triggered, the drive system 1 is in the disengaged configuration and the torsion spring 25 releases its energy. Before releasing the cable 21 and switching back to the engaged configuration to return to normal operation, it is possible to re-tension the torsion spring 25, or to return it to a pre-stressed state, because its first end 250 is fixed to the main shaft 7 which is free to rotate, while the second end 252 is linked to the rotating element 9 which is then fixed to rotate. A rotation is applied to the torsion spring 25, by means of the actuator 3, for example a predefined number of turns depending on the torque necessary for raising the apron, then the cable 21 is released to return to the engaged configuration again.

To ensure that the correct number of revolutions is obtained automatically when the spring 25 is preloaded by the actuator 3, a limit switch device is integrated into the drive system 1.

This limit switch device comprises a threaded rod 27 secured in rotation to the main shaft 7 and a slider 29 screwed in helical connection on the threaded rod 27 and fixed in rotation relative to the winding member 11, such way that the cursor 29 is mobile in translation along the central axis X of system 1.

The cursor 29 is movable between a first position, shown in Figure 5 , in which the spring 25 is not preloaded and the actuator 3 is free to preload the spring 25 by free rotation between the main shaft 7 and the rotating element 9, and a second position, shown in Figure 6 , in which the spring 25 is preloaded and the slider 29 abuts against an element secured to the main shaft 7 in such a way that the actuator 3 is automatically stopped.

The system 1 comprises a ring 31 fixed to the output shaft 5 of the actuator 3 and to which a first end 270 of the threaded rod 27 is fixed. The system 1 also includes a ring 33 fixed to the main shaft 7 and on which the spring 25 and a second end 272 of the threaded rod 27 are fixed. By its connection with the threaded rod 27, the ring 31 is also integral with the main shaft 7.

The operation of the drive system 1 during the reset of the spring 25 is as follows. In the disengaged configuration, following the operation of the control 21, the spring 25 released its energy to raise the roller shutter apron. To reset the spring 25, or in other words, to pre-stress it, it is necessary to apply a certain angle of rotation to it, equivalent to a given number of turns of the actuator 3. The shutter and therefore the tube 11 and the rotating element 9 being in a blocked position due to the raised configuration of the shutter, it is necessary to rotate the main shaft 7 to reset the spring 25, before returning the system 1 to the engaged configuration.

In the disengaged and non-reset configuration, the slider 29 is located on the threaded rod 27 in a position abutting against the ring 33 as is visible on the Figure 5 . The slider 29 can be found in an intermediate position between the ring 33 and the ring 31, as is visible in the Figure 4 .

When the actuator 3 is started in the direction of reassembly of the shutter, the main shaft 7 and the threaded rod 27 undergo a rotation, transmitted by the ring 33 to the spring 25. The tube 11 being blocked, the slider 29 being in helical connection with the threaded rod 27 undergoes a translation along the axis Figure 5 . This translation continues until the cursor 29 abuts against the ring 31. This arrival at abutment causes a torque peak at the actuator 3, and the actuator 3 is adapted to stop automatically in case of a torque peak, just as it does when the shutter arrives in the raised position or in the lowered position. It is this abutment support which defines the correct number of turns to preload the spring 25.

The preload of the spring 25 is then obtained, and the system 1 can be returned to the engaged configuration.

• la longueur de la tige filetée 27 selon l'axe X,
• le pas de la tige filetée 27 selon l'axe X,
• la position de départ du curseur 29 sur la tige filetée 27, réglable lors de l'assemblage du système 1 en atelier, qui définit la course que peut parcourir le curseur 29 lors du réarmage, de manière à obtenir la remontée complète du tablier du volet,
• l'épaisseur selon l'axe central X du curseur 29.

The preload of spring 25 can be predefined by choosing one or more of the following parameters:

• the length of the threaded rod 27 along the axis
• the pitch of the threaded rod 27 along the axis
• the starting position of the cursor 29 on the threaded rod 27, adjustable during the assembly of the system 1 in the workshop, which defines the travel that the cursor 29 can travel during rearming, so as to obtain the complete raising of the shutter apron ,
• the thickness along the central axis X of cursor 29.

When the shutter is raised by the spring 25, the spring 25 relaxes during disengagement as described previously. The actuator 3 is in an inactive configuration and therefore braked, and the rotating element 9 is rotated causing the rotation of the tube 11 and the raising of the shutter. Cursor 29 is then driven towards its position of the Figure 5 before rearming, or at an intermediate position distant from ring 33, depending on the adjustment which was made in the workshop.

Optionally, the system 1 includes net stop shapes provided in a complementary manner on the slider 29 and on the ring 31. These shapes can be, for example, abutment surfaces 310 and 292 provided respectively on the ring 31 and the slider 29. These surfaces 310 and 292 are flat and oriented along a plane including the main axis X. Optionally, similar stopping surfaces 330 and 290 can be provided respectively on the ring 33 and on the slider 29.

The translation of the cursor 29 relative to the winding tube 11 along the central axis and a non-circular internal shape complementary to the winding tube 11. For example, these shapes can be a polygonal profile, in particular an octagonal profile visible to the figures 3 And 4 .

According to an optional embodiment not shown, the system 1 may comprise means for damping the stopping of the cursor 29 against the rings 31 and/or 33, for example blocks of elastomeric material on the abutment surfaces, parts in friction, etc.

According to another optional embodiment not shown, the system 1 can comprise a control means integrated in the limit switch device or in an element linked to the spring 25 to make it possible to signal to a user that the spring 25 is armed and ready to function. This control means can for example include a piezoelectric cell.

According to another optional embodiment not shown, the system 1 can comprise a safety system integrated into the limit switch device, or in an element linked to the disengageable device 2, making it possible to prohibit the operation of the rolling shutter as long as spring 25 remains disarmed.

According to another optional embodiment not shown, the system 1 can comprise a control means integrated in the limit switch device or in an element linked to the spring 25, making it possible to prove that the drive system 1 has operated, and that the raising of the rolling shutter by means of the release of spring 25 has been obtained. Such a means of control can be used during an accident investigation.

According to an embodiment not shown, the drive system 1 may comprise not a single spring 25 but several elastic elements, in particular springs. For example, several coaxial springs arranged in series or in parallel can be used. In the case of a series arrangement, the springs will be arranged coaxially, each spring exerting a torque on the next, the last being connected to the rotating element 9 to transmit the overall torque of the spring series. In the case of a parallel arrangement, the springs will be arranged coaxially, each spring exerting its torque on the rotating element.

The spring(s) can also be mounted around a conical core, that is to say a part centered on the central axis X and whose profile along the central axis X is not rectilinear. During preloading, the spring 25 would be wound against this part and the deformation of the spring 25 would be modified by cooperation with the non-rectilinear profile of this part, generating a non-linear stiffness when the spring 25 is released.

The characteristics of the embodiments and variants described above can be combined to form new embodiments of the invention within the scope defined by the claims.

Claims (10)

1. A drive system (1) for rotating a winding member (11) of a windable closure screen apron about a central axis (X), the drive system comprising:

   - an actuator (3) driving an output shaft (5),

   - a main shaft (7) driven by the output shaft (5),

   - at least one torsion spring (25),

   - a disengageable device (2),

   characterised in that:

   - the drive system (1) comprises a rotary element (9) that is rotatable and translationally fixed relative to the main shaft (7), and is rotationally fixed to the winding member (11),

   - the torsion spring (25) is fixed at one end (250) to the main shaft (7) and at the other end (252) to the rotating element (9),

   - the disengageable device (2), in an engaged configuration, makes the main shaft (7) and the rotary member (9) rotationally integral, and in a disengaged configuration, disengages the main shaft (7) and the rotary member (9) rotationally integral, whereas in the disengaged configuration the torsion spring (25) is adapted to be pre-stressed by relative rotation between the main shaft (7) and the rotary member (9), and the pre-stressed torsion spring (25) drives the rotary member (9) in rotation about the central axis (X) so that the curtain is driven towards a rolled-up configuration,

   - the drive system (1) also comprises a threaded rod (27) rotationally fixed to the main shaft (7) and a slider (29) screwed onto the threaded rod (27) and rotationally fixed with respect to winding member (11) in such a way that the slider (29) is translationally movable along the central axis (X) of the system (1) between a first position, in which the spring (25) is not prestressed and the actuator (3) is free to pre-stress the spring (25) by free rotation between the main shaft (7) and the rotary element (9), and a second position, in which the spring (25) is pretensioned and the slider (29) is in abutment against an element (31) integral with the main shaft (7) so that the actuator (3) is automatically stopped.
2. A drive system according to claim 1, characterised in that it comprises a ring (31) forming the element (31) integral with the main shaft (7), fixed to the output shaft (5) of the actuator (3) and to which a first end (270) of the threaded rod (27) is fixed.
3. A drive system as claimed in claim 2, characterised in that it comprises a ring (33) fixed to the main shaft (7) and to which the spring (25) and a second end (272) of the threaded rod (27) are fixed.
4. A drive system according to one of the preceding claims, characterised in that it comprises net stop shapes (292, 290, 310, 330) provided in a complementary manner on the slider (29) and on the ring (31) fixed to the first end (270) of the threaded rod (27) and/or on the slider (29) and on the ring (33) fixed to a second end (272) of the threaded rod (27).
5. A drive system according to one of the preceding claims, characterised in that it comprises means for damping the stop of the slider (29) against the element (31) integral with the main shaft (7).
6. A drive system according to one of the preceding claims, characterised in that the spring (25) cooperates with a conical core.
7. A drive system according to one of the preceding claims, characterised in that it comprises monitoring means adapted to signal that the spring (25) is loaded and ready for operation.
8. A drive system according to one of the preceding claims, characterised in that it comprises a safety system for preventing operation of the door leaf as long as the spring (25) remains disarmed.
9. A drive system according to one of the preceding claims, characterised in that it comprises checking means for proving that the release of the spring (25) has worked.
10. Drive system according to one of the preceding claims, characterised in that the slider (29) and the winding member (11) have a complementary geometry enabling the slider (29) to be translated relative to the winding member (11) along the central axis (X) of the system (1) and the slider (29) to be prevented from rotating relative to the winding member (11) along the central axis (X).

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