FR3090726A1 - Rotational drive system for a winding member of a windable closing screen apron - Google Patents

Abstract

Rotational drive system for a winding member of a windable closing screen apron This driving system (1) for rotating a winding member (11) of a screen apron rolling closure comprises an actuator (3) driving a main shaft (7), a rotary element (9) integral in rotation with the winding member (11), a torsion spring (25), and a disengageable device ( 2). In the disengaged configuration, the torsion spring (25) is able to be prestressed by a relative rotation between the main shaft (7) and the rotary element (9), and the torsion spring (25) previously prestressed causes the rotary element (9) rotating so that the deck is driven to a rolled up configuration. This system also comprises a threaded rod (27) integral in rotation with the main shaft (7) and a slider (29) screwed onto the threaded rod (27) and fixed in rotation relative to the winding member (11 ) in such a way that the cursor (29) is movable in translation between a first position, in which the spring (25) is not prestressed and the actuator (3) is free to prestress 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 prestressed 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. Figure for the abstract: Figure 3

Description

Description

Title of the invention: Rotary drive system for a winding member of a windable closing screen apron The present invention relates to a rotary drive system for a winding member a closing screen apron that can be rolled up around a central axis.

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

Certain standards in force impose the possibility of operating the deck in the event of an electrical failure.

Disengageable prestressed spring systems allow the energy stored by the prestressed spring to be restored to raise the deck. Once the spring has restored its energy, the spring must be prestressed again by operating a certain number of turns before resetting the disengageable system.

The objective of the invention is to provide a new drive system in which the spring preload is obtained in a simple and precise manner.

To this end, the 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. This system comprises an actuator driving an output shaft, a main shaft driven by the output shaft, a rotary element movable in rotation and fixed in translation relative to the main shaft, and integral in rotation with the member of winding. This system also comprises at least one torsion spring fixed, at one of its ends, to the main shaft, and at its other end, to the rotary element, as well as a disengageable device which, in a clutched configuration , makes the main shaft and the rotary element integral in rotation, and in a disengaged configuration, disengages in rotation the main shaft and the rotary element. In the disengaged configuration, the torsion spring is able to be prestressed by a relative rotation between the main shaft and the rotary element, and the previously prestressed torsion spring drives the rotary element in rotation around the central axis of such so that the deck is driven to a rolled up configuration. The system further comprises a threaded rod integral in rotation with the main shaft and a slider screwed onto the threaded rod and fixed in rotation relative to the winding member so that the slider is movable in translation according to the central axis of the system between a first position, in which the spring is not prestressed and the actuator is free to prestress the spring by free rotation between the main shaft and the rotary element, and a second position, in which the spring is prestressed and the slider is in abutment against an element integral with the main shaft so that the actuator is automatically stopped.

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 engine to stop once the correct number of revolutions has been reached by the simple detection of a peak in torque following the arrival of the cursor at the stop.

According to advantageous but not compulsory aspects of the invention, such a drive system can incorporate one or more of the following characteristics, taken in any 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 ring fixed to the main shaft and on which are fixed the spring and a second end of the threaded rod.

- The system includes forms of net stop 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 a second end of the rod threaded.

- 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 means of control adapted to signal that the spring is armed and ready to operate.

- The system includes a security system to prohibit the operation of the shutter as long as the spring remains unarmed.

- The system includes a means of control to prove that the release of the spring worked.

- The cursor and the winding member have a complementary geometry allowing the translation of the cursor relative to the winding member along the central axis of the system and the blocking of rotation of the cursor relative to the winding member along the central axis.

The invention will be better understood and other advantages of it will appear more clearly in the following description of a drive system in accordance with its principle, given by way of nonlimiting example with reference to annexed drawings in which:

[Fig.l] Figure 1 shows in schematic view a drive system according to the invention in a clutched configuration;

[Fig.2] Figure 2 shows in schematic view the drive system of Figure 1 in a disengaged configuration;

[Fig.3] Figure 3 is a perspective view of the drive system of Figures 1 and 2;

[Fig.4] Figure 4 is an enlarged view of detail IV in Figure 3;

[Fig.5] Figure 5 is a side view of part of the drive system in a free state of a system spring;

[Fig.6] Figure 6 is a view similar to Figure 5 in a prestressed state of the spring.

Figures 1 to 6 show a drive system 1 comprising an actuator 3 having an output shaft 5. The output shaft 5 defines a central axis X of the drive system 1. For example, the actuator 3 can be an electric motor, a winch, etc.

The output shaft 5 is connected to a main shaft 7 of the drive system 1, so that the main shaft 7 is rotatably connected to the output shaft 5.

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

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

The drive system 1 comprises a disengageable device 2 which, in a clutched configuration, makes rotationally integral with the main shaft 7 and the rotary element 9, and in a disengaged configuration, disengages in rotation the main shaft 7 and the rotary element 9.0

This disengageable device 2 comprises a member 13 movable in translation on the main shaft 7 and relative to the rotary element 9. The member 13 is integral in rotation with the main shaft 7. The main shaft 7 having a circular profile making it impossible to secure it in rotation by direct mounting, 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 piece 15 has for example a non-circular external profile, corneal of a non-circular profile provided on the inside of the member 13. Thus, the rotation of the intermediate piece 15 is transmitted to the member 13, while allowing the relative translation of these two parts.

The disengageable device 2 comprises disengageable connecting means provided on the rotary element 9 and the member 13 which allow them to engage or disengage according to the axial position of the member 13. The rotary element 9 is equipped with first rotary coupling means 92, and the member 13 includes second rotary coupling means 132. The rotary coupling means 92 and 132 are formed by complementary shapes, such as teeth or splines. In this example, the shapes are alternately projecting reliefs and recesses circumferentially visible in FIG. 3 forming, in the coupled configuration, rotational stops. Any other form can be considered.

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

In a clutch configuration shown in Figure 1, the coupling means 92 are engaged with the coupling means 132, causing a rotational attachment of the member 13 with the rotary member 9. In a configuration disengaged shown in FIG. 2, the coupling means 92 are in a second remote position and are no longer engaged with the coupling means 132, causing a separation in rotation of the member 13 with the rotary element 9. Between the engaged configuration and the disengaged configuration, the member 13 has undergone a translation along the axis X opposite the rotary 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 by default push the member 13 back into the engaged configuration. These elastic means are formed by a compression spring 19, interposed between the member 13 and a flange 152 of the intermediate piece 15.

The drive system 1 also includes a control connected to the member 13, and adapted to move the member 13 to its disengaged configuration, against the force of the spring 19. For example, this control may be provided in the form of a cable 21 actuable 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 rotary element 9, which drives it to its disengaged configuration.

The drive system 1 comprises at least one torsion spring 25 which drives the rotary element 9 in rotation about the central axis X so that the deck is driven towards a rolled up configuration. The purpose of this torsion spring 25 is to provide a return torque on the bulkhead to 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 rotary element 9. In other words, the torsion spring 25 is arranged in series between the actuator 3 and the winding tube IL The actuator 3 drives the main shaft 7, which drives the torsion spring 25, which drives the rotary element 9, which drives the winding tube IL

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

To obtain a raising of the deck, a prestress 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 capable of being prestressed by a relative rotation between the main shaft 7 and the rotary element 9. In other words, in an unsolicited or free state, the spring 25 cannot generate a relative rotation of the main shaft 7 and of the rotary element 9, but when a rotation between the main shaft 7 and the rotary element 9 is applied, the spring 25 is in a stressed state , or prestressed. In this state, it undergoes an internal stress which tends to exert a relative rotation between the main shaft 7 and the rotary element 9 relative to each other, so that the deck is raised.

The operation of the drive system 1 is as follows. In normal operating configuration, the rotary element 9 and the member 13 are in the 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 rotary element 9 thanks to the disengageable connection means 92 and 132. The torque of the actuator 3 is found at the level of the rotary element 9. The pre-stressed torsion spring 25 keeps the rotary element 9 under tension, which, once released, will be driven in rotation, then will drive the winding tube 11 But as long as the member 13 and the rotary element 9 are engaged, the torsion spring 25 cannot release its energy.

When the cable 21 is actuated forming the control, along the arrow El, in emergency operation, the member 13 moves in translation along the axis X away from the rotary element 9, according to arrow E2. This requires applying 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 rotary element 9 is found 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 the deck.

When the cable 21 is stopped actuating, the spring 19 pushes the member 13 against the rotary 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 rotary 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 declutching 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 restore it to the pre-stressed state, since 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 rotary element 9 which is then fixed in rotation. A rotation is applied to the torsion spring 25, by means of the actuator 3, for example a predefined number of turns as a function of the torque necessary for lifting the bulkhead, then the cable 21 is released to again find the engaged configuration.

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

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

The slider 29 is movable between a first position, shown in FIG. 5, in which the spring 25 is not prestressed and the actuator 3 is free to prestress the spring 25 by free rotation between the main shaft 7 and the rotary element 9, and a second position, represented in FIG. 6, in which the spring 25 is prestressed and the slider 29 is in abutment against an element integral with the main shaft 7 so 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 comprises a ring 33 fixed to the main shaft 7 and on which are fixed the spring 25 and a second end 272 of the threaded rod 27. By its connection with the threaded rod 27, the ring 31 is also secured to main tree 7.

The operation of the drive system 1 during the resetting 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 reassemble the roller shutter deck. To reset the spring

25, or in other words, prestress it, it is necessary to apply to it a certain angle of rotation, equivalent to a given number of turns of the actuator 3. The flap and therefore the tube 11 and the rotary element 9 being in a locked position due to the raised configuration of the flap, it is necessary to subject the main shaft 7 to a rotation to reset the spring 25, before returning the system 1 to the engaged configuration.

In the disengaged and not reset configuration, the slider 29 is located on the threaded rod 27 in a position in abutment against the ring 33 as can be seen in FIG. 5. The slider 29 can be in an intermediate position between the ring 33 and ring 31, as can be seen in FIG. 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 cursor 29 being in helical connection with the threaded rod 27 undergoes a translation along the axis X in the direction of the ring 31, according to arrow F3 in FIG. 5. This translation continues until the cursor 29 arrives at abutment against the ring 31. This arrival in abutment causes the actuator 3 to peak in torque, and the actuator 3 is adapted to stop automatically in the event of a torque spike, just as it does during the arrival of the shutter in the raised position or in the lowered position. It is this abutment support which defines the right number of turns to prestress the spring 25.

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

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

- the length of the threaded rod 27 along the axis X,

- the pitch of the threaded rod 27 along the axis X,

- The starting position of the cursor 29 on the threaded rod 27, adjustable during assembly of the system 1 in the workshop, which defines the travel that the cursor 29 can travel during resetting, so as to obtain the complete ascent the shutter deck,

- the thickness along the central axis X of the cursor 29.

When the shutter is raised by the spring 25, the spring 25 relaxes when disengaging as described above. The actuator 3 is in an inactive configuration therefore braked, and the rotary element 9 is rotated causing the rotation of the tube 11 and the raising of the flap. The cursor 29 is then driven to its position in FIG. 5 before resetting, or else to an intermediate position remote from the ring 33, depending on the adjustment which has been made in the workshop.

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

The translation of the slider 29 relative to the winding tube 11 along the central axis X and the rotation lock of the slider 29 relative to the winding tube 11 can be obtained by a non-circular external shape of the slider 29, and an internal non-circular shape complementary to the winding tube 11. For example, these shapes can be a polygonal profile, in particular an octagonal profile visible in FIGS. 3 and 4.

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

According to another optional embodiment not shown, the system 1 may include a control means integrated in the end-of-travel device or in an element linked to the spring 25 to allow a user to signal that the spring 25 is armed and ready to operate. This control means can for example comprise a piezoelectric cell.

According to another optional embodiment not shown, the system 1 may include a security system integrated in the end-of-travel device, or else in an element linked to the disengageable device 2, making it possible to prohibit the operation of the flap rolling while the spring 25 remains disarmed.

According to another optional embodiment not shown, the system 1 may include a control means integrated in the end-of-stroke device or in an element linked to the spring 25, making it possible to prove that the drive system 1 has functioned, and that the rolling shutter has been raised by means of the release of the 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 can 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 rotary element 9 to transmit the overall torque of the series of springs. In the case of a parallel arrangement, the springs will be arranged coaxially, each spring exerting its torque on the rotary element.

Or the springs 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 straight. During prestressing, 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.

Claims (1)

Claims [Claim 1] Drive system (1) for rotating a winding member (11) of a closing screen apron that can be rolled up around a central axis (X), characterized in that it comprises: - an actuator (3) driving an output shaft (5), - a main shaft (7) driven by the output shaft (5), - a rotary element (9) movable in rotation and fixed in translation relative to the main shaft (7), and integral in rotation with the winding member (11), - at least one torsion spring (25) fixed at one (250) of its ends to the main shaft (7), and at its other end (252), to the rotary element (9), - a disengageable device (2) which, in a clutched configuration, makes the main shaft (7) and the rotary element (9) integral in rotation, and in a disengaged configuration, disconnects the main shaft (7) in rotation and the rotary element (9), while, in the disengaged configuration, the torsion spring (25) is able to be prestressed by a relative rotation between the main shaft (7) and the rotary element (9), and the pre-stressed torsion spring (25) drives the rotary element (9) in rotation about the central axis (X) so that the deck is driven towards a rolled configuration, - a threaded rod (27) integral in rotation with the main shaft (7) and a slider (29) screwed onto the threaded rod (27) and fixed in rotation relative to the winding member (11) of such so that the cursor (29) is movable in translation 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 prestress 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 prestressed 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. [Claim 2] Drive system according to claim 1, characterized 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. [Claim 3] Drive system according to claim 2, characterized in that it comprises a ring (33) fixed to the main shaft (7) and on which are fixed the spring (25) and a second end (272) of the threaded rod (27). [Claim 4] Drive system according to one of the preceding claims, characterized in that it comprises forms of net stop (292, 290, 310, 330) provided in a complementary manner on the slider (29) and on the ring (31 ) fixed at the first end (270) of the threaded rod (27) and / or on the slider (29) and on the ring (33) fixed a second end (272) of the threaded rod (27). [Claim 5] Drive system according to one of the preceding claims, characterized in that it comprises means for damping the slider stop (29) against the element (31) integral with the main shaft (7). [Claim 6] Drive system according to one of the preceding claims, characterized in that the spring (25) cooperates with a conical core. [Claim 7] Drive system according to one of the preceding claims, characterized in that it comprises a control means suitable for signaling that the spring (25) is armed and ready to operate. [Claim 8] Drive system according to one of the preceding claims, characterized in that it comprises a safety system making it possible to prohibit the operation of the roller shutter as long as the spring (25) remains disarmed. [Claim 9] Drive system according to one of the preceding claims, characterized in that it comprises a control means making it possible to prove that the release of the spring (25) has worked. [Claim 10] Drive system according to one of the preceding claims, characterized in that the cursor (29) and the winding member (11) have a complementary geometry allowing the translation of the cursor (29) relative to the member d winding (11) along the central axis (X) of the system (1) and the rotation blocking of the slider (29) relative to the winding member (11) along the central axis (X). 1/6