MOTORIZED ACTUATION SYSTEM FOR A MOVABLE WALL CLOSING AN ACCESS SECTION OF A PREMISES

Abstract

MOTORIZED ACTUATION SYSTEM FOR A MOVABLE CLOSING WALL OF AN ACCESS SECTION OF A PREMISES Motorized actuation system for a movable closing wall of an access section of a premises, which comprises: - a toothed crown (2) which can be rotatably coupled to a main shaft which can be positioned in an upper end of the access section and can be coupled to the movable closing wall and be fixed to the movable closing wall, - at least a first motor (10) having a first motor shaft (11), - a first reducer (20) arranged between the first motor shaft (10) and the toothed crown (2), the first reducer (20) being coupled to the first motor (10) and being provided with a respective toothed member (21) intended to mesh with the toothed crown, - a fall arrest device (60) configured to interact with the toothed crown (2) and block its rotation, the toothed crown (2) having a first housing (61),the fall arrest device (60) being arranged in the first housing (61), - first fixing means (62) for fixing the fall arrest device (60) to the toothed crown (2) at the first housing (61).,

Description

Title of the invention: MOTORIZED ACTUATION SYSTEM FOR A MOVABLE WALL CLOSING AN ACCESS SECTION OF A PREMISES Technical field

[0001] The present invention relates to a motorized actuation system for a movable wall closing an access section of a room. Prior art

[0002] In the field of systems for closing premises or spaces such as, for example, garages, shops, workshops, etc., there are different types of devices including motorized rolling shutters.

[0003] The actuation systems with which known rolling shutters are equipped have certain disadvantages both in terms of ease of assembly and maintenance and in terms of safety.

[0004] In the event of breakage of the compensation springs with which rolling shutters are generally equipped, the shutter is held in place solely by the motor brake.

[0005] In the sector, there is a need to further improve the safety of motorized rolling shutters.

[0006] Another need that is felt in the sector is that of simplifying as much as possible the maneuvers that an operator must carry out when assembling or maintaining the curtain. Subject of the invention

[0007] The aim of the present invention is to propose a motorized actuation system for a movable wall for closing an access section of a room which overcomes the aforementioned drawbacks of the known technique and meets the aforementioned needs, by improving operational safety, both for the end user and for the installer.

[0008] The specified technical task is essentially carried out by a motorized actuation system of a movable wall for closing an access section of a room, comprising one or more of the technical characteristics set out in the embodiments presented in the description.

[0009] Preferably, the specified technical task is essentially carried out by a motorized actuation system of a movable wall closing an access section of a room, said actuation system comprising: - a ring gear which can be rotatably coupled to a main shaft which can be positioned in an upper end of the access section and can be coupled to the movable closing wall and be fixed to the movable closing wall, - at least one first motor having a first drive shaft, - a first reducer arranged between the first motor shaft and the toothed ring, the first reducer being coupled to the first motor and being provided with a respective toothed member intended to mesh with the toothed ring, - a fall arrest device configured to interact with the toothed crown and block its rotation, the toothed crown having a first housing, the fall arrest device being arranged in the first housing, - first fixing means for fixing the fall arrest device to the toothed crown at the first housing.

[0010] Preferably, the first fixing means comprise a plurality of screws.

[0011] Preferably, the first motor comprises a coupling device configured to couple the first reducer to the first motor.

[0012] Preferably, the coupling device comprises a coupling element associated with the first motor shaft, said coupling element comprising a first and a second tooth.

[0013] Preferably, the coupling device comprises a transmission element associated with the first reducer, said transmission element having a first and a second cavities shaped so as to respectively house the first and the second tooth of the coupling element.

[0014] Preferably, the coupling device comprises an elastic element configured to urge the coupling element against the transmission element.

[0015] Preferably, the actuation system comprises a release system configured to uncouple the first drive shaft from the first live reducer.

[0016] Preferably, the release system comprises a hooking element coupled to the first motor shaft and a release fork configured to move the hooking element between a non-operational position, in which it determines the uncoupling of the first motor shaft from the first reducer and an operational position, in which it determines the coupling of the first motor shaft with the first reducer.

[0017] Preferably, in the non-operational position the coupling element is uncoupled from the transmission element and in the operation position the first coupling element is coupled to the transmission element.

[0018] Preferably, in the operational position the first and second teeth of the coupling element respectively occupy the first and second cavities of the transmission element.

[0019] Preferably, the release fork comprises a first portion and a second portion having a wedge-shaped conformation, the hooking element having first and second ramps intended to come into contact with the first and second portions of the release fork to move the hooking element between the operative position and the non-operative position.

[0020] Preferably, the actuation system comprises a sensor group comprising a first detector configured to perform a first detection of a first end-of-travel position of the movable closing wall and a second detector configured to perform a second detection of the first end-of-travel position of the movable closing wall, the first detector and the second detector being configured to respectively generate a first signal and a second signal as a function of the first and second detection of the first end-of-travel position.

[0021] Preferably, the actuation system comprises a control unit in communication at least with the first motor and with the sensor group, the control unit being configured to receive the first and second signals.

[0022] Preferably, said sensor group comprises an actuating element constrained to translate along a first longitudinal axis between a first position, corresponding to the first end-of-travel position of the movable closing wall, and a second position, corresponding to the second end-of-travel position of the movable closing wall.

[0023] Preferably, the actuating element, at the first position, contacts the first detector and the second detector, at the second position, the actuating element contacts the third and fourth detector.

[0024] Preferably, the sensor group comprises a third detector configured to perform a first detection of a second end-of-travel position of the movable closing wall and a fourth detector configured to perform a second detection of the second end-of-travel position of the movable closing wall, the third and fourth detectors being configured to generate a third and fourth signal as a function of the first and second detection of the second end-of-travel position.

[0025] Preferably, said sensor group comprises: - a drive element, constrained to rotate about a second longitudinal axis, preferably parallel to the first longitudinal axis, - first and second contact elements secured to the drive element and configured to move along the drive element, the actuating element contacting the first contact element at the first position and contacting the second contact element at the second position.

[0026] Preferably, the ring gear comprises a cylindrical fastening element configured to couple the ring gear to the main shaft.

[0027] Preferably, the actuation system comprises second fixing means, the cylindrical element having a plurality of through holes for housing the second fixing means.

[0028] Preferably, the system comprises a second motor having a second drive shaft and a second reduction gear disposed between the second drive shaft and the ring gear, the second reduction gear being coupled to the second shaft and being provided with a respective toothed member for meshing with the ring gear.

[0029] Preferably, the system comprises a main shaft positionable in an upper end of the access section and coupleable to the movable closing wall, the ring gear being coupled to said main shaft.

[0030] Preferably, the system comprises a plurality of cylindrical housings rotatably associated with the main shaft for rotation thereon and coupleable to the movable closing wall.

[0031] Preferably, the system comprises a plurality of elastic elements defining windings, each elastic element being fixed at its ends to the main shaft and to a cylindrical housing.

[0032] Preferably, each cylindrical housing has an outer side wall and comprises at least one ring element disposed on said outer wall.

[0033] Preferably, the system comprises a pair of ring members disposed on said outer wall at a first and a second end.

[0034] Preferably, the ring gear comprises a respective pair of ring elements.

[0035] Preferably, the toothed crown has a diameter between 180 mm and 195 mm, preferably 186 mm. Summary description of the drawings

[0036] This description will be set out below with reference to the attached drawings, provided solely for information and, consequently, non-limiting, in which:

[0037] [Fig-1]: [Fig.l] illustrates a first embodiment of a system motorized actuation of a movable wall closing an access section of a room in a perspective view, in accordance with the present description;

[0038] [Fig.2]: [Fig.2] illustrates a second embodiment of a motorized actuation system for a movable wall closing an access section of a room in a perspective view, in accordance with the present description;

[0039] [Fig.3]: [Fig.3] illustrates a motorized actuation system for a movable wall for closing an access section of a room with certain parts removed, in a perspective view, in accordance with the present description;

[0040] [Fig.4]: [Fig.4] illustrates an exploded view of a portion of the actuation system of [Fig.3] with certain elements removed in a perspective view, in accordance with the present description;

[0041] [Fig.5]: [Fig.5] illustrates an exploded view of a portion of the actuation system of [Fig.3] with certain elements removed in a perspective view, in accordance with the present description;

[0042] [Fig.6]: [Fig.6] illustrates certain details of [Fig.3], in a perspective view, in accordance with the present description;

[0043] [Fig.7]: [Fig.7] illustrates certain details of [Fig.3], in a perspective view, in accordance with the present description;

[0044] [Fig.8]: [Fig.8] illustrates a sensor group of the system of [Fig.l] with certain parts removed in a perspective view, in accordance with the present description;

[0045] [Fig.9]: [Fig.9] illustrates a sensor group of the system of [Fig.l] with certain parts removed in a perspective view, in accordance with the present description;

[0046] [Fig. 10]: [Fig. 10] illustrates a motorized actuation system for a movable wall for closing an access section of a room in a front view, in accordance with the present description;

[0047] [Fig. 11]: [Fig.l 1] illustrates a fall arrest device of the system of [Fig. 10] in a perspective view, in accordance with the present description;

[0048] [Fig.l2A]: [Fig.l2A] illustrates a fall arrest device of the system of [Fig. 10] in a perspective view, in accordance with the present description;

[0049] [Fig.l2B]: [Fig.l2B] illustrates a fall arrest device of the system of [Fig. 10] in a perspective view, in accordance with the present description;

[0050] [Fig. 13]: [Fig. 13] illustrates a motorized actuation system for a movable wall for closing an access section in a perspective view, in accordance with the present description. Description of the embodiments

[0051] The subject of the description is a system 1 for motorized actuation of a movable wall for closing an access section of a room.

[0052] As illustrated in [Fig.l], the actuation system 1 for the movement of the movable wall comprises:

[0053] - a toothed crown 2 rotatably coupled to a main shaft 100 which can be positioned in an upper end of the access section and can be coupled to the movable closing wall and be fixed to the movable closing wall,

[0054] - at least one first motor 10 having a first motor shaft 11,

[0055] - a first reducer 20 arranged between the first motor shaft 11 and the crown toothed 2 (to transmit the movement of the first motor shaft 11 to the toothed crown 2).

[0056] As illustrated in [Fig.3], the first reducer 20 is coupled to the first motor 10 and is provided with a respective toothed member 21 intended to mesh with the toothed crown 2.

[0057] In a preferred embodiment, the toothed crown 2 has a diameter between 180 mm and 195 mm, preferably 186 mm.

[0058] Advantageously, having a toothed crown with a diameter between 180 and 195 mm, preferably 186 mm, makes it possible to increase the engine torque.

[0059] Advantageously, having a toothed crown with a diameter of between 180 and 195 mm, preferably 186 mm, makes it possible to obtain a smaller footprint.

[0060] In a preferred embodiment, the first motor 10 comprises a coupling device 30 configured to couple the first reducer 20 to the first motor 10.

[0061] The coupling device 30 comprises a coupling element 31 associated with the first drive shaft 11.

[0062] The coupling element 31 has a first surface SI and a second surface S2 opposite the surface SL

[0063] The coupling element 31 comprises a first and a second tooth 31 A, 31B.

[0064] The first and second teeth 31 A, 31B project from the surface SL

[0065] At the surface S2, the coupling element 31 comprises four teeth 31C, 31D, 31E, 31F.

[0066] The coupling device 30 comprises a transmission element 32 associated with the first reducer 20.

[0067] The transmission element 32 has a first surface S3 and a second surface S4 opposite the surface S3.

[0068] The transmission element 32 has a first and a second cavities 32A, 32B shaped so as to respectively house the first and second teeth 31A, 31B of the coupling element 31.

[0069] In particular, the transmission element 32 has the first and second cavities 32A, 32B at the surface S3.

[0070] At the surface S4, the transmission element 32 has a toothed projection 32C configured to engage with the first reducer 20.

[0071] In other words, the transmission element 32 is essentially a sun type gear.

[0072] Preferably, the coupling device 30 comprises a first and a second sealing element 36, 37 interposed between the transmission element 32 and the coupling element 31.

[0073] In a preferred embodiment, the coupling device 30 comprises an elastic element 33 configured to push the coupling element 31 against the transmission element 32.

[0074] The elastic element 33 is preferably a spring.

[0075] The elastic element 33 is associated with the first motor 1 and envelops a part of the first motor shaft 11.

[0076] The coupling device 30 comprises a first and a second coupling element 34, 35 positioned between the first motor shaft 11 and the coupling element 31.

[0077] In particular, as illustrated in [Fig.5], the first coupling element 34 comprises guides 34C, 34D, 34E, 34F for housing the teeth 31C, 31D, 31E, 31F of the coupling element 31.

[0078] The actuation system 1 comprises a release system 40 configured to uncouple the first motor shaft 11 from the first reducer 20.

[0079] The release system 40 comprises a hooking element 41 coupled to the first drive shaft 11.

[0080] The release system 40 comprises a release fork 42 configured to move the hooking element 41 between a non-operational position PI, in which it determines the uncoupling of the first motor shaft 11 from the first reducer 20 and an operational position P2, in which it determines the coupling of the first motor shaft 11 with the first reducer 20.

[0081] In the non-operational position PI, the coupling element 31 is uncoupled from the transmission element 32 and in the operational position P2, the first coupling element 31 is coupled to the transmission element 32.

[0082] In the operational position P2, the first and second teeth 31A, 31B of the coupling element 31 respectively occupy the first and second cavities 32A, 32B of the transmission element 32.

[0083] In a preferred embodiment, the release fork 42 comprises a first portion 42A and a second portion 42B having a wedge-shaped conformation.

[0084] As illustrated in Figures 6 and 7, the hooking element 41 has a first ramp 41A and a second ramp 41B intended to come into contact with respectively the first portion 42A and the second portion 42B of the fork of release 42 for moving the hooking element 41 between the operational position P2 and the non-operational position PI.

[0085] Advantageously, releasing the brake by moving the rotor outwards, thus decoupling the motor 10 from the reducer, makes it possible to release the brake during installation simply using the release fork.

[0086] The installer, thanks to the release fork, is able to make the motor reversible in order to be able to rotate the toothed crown and position it at the desired point during installation.

[0087] Known motors allow the brake to be released only by means of a steel cable provided in the motor and connected to a lever device or a sleeve, a particularly impractical solution, particularly during installation.

[0088] The fork 42 and the steel element 41, on the other hand, make these operations particularly practical and simple.

[0089] Advantageously, releasing the brake by moving the rotor outwards, thus decoupling the motor 10 from the reducer, makes it possible to block the rise of the curtain after releasing the brake.

[0090] In fact, releasing the brake allows the motor to be in reversible mode.

[0091] Indeed, if the motor is electrically powered, it turns in neutral, thus preventing the movement of the curtain.

[0092] In the event that the compensation springs of the rolling shutter are broken and the shutter is held in place solely by the motor brake, it is extremely important that the motor does not allow the shutter to be operated when the brake is released.

[0093] The other motors, even when the brake is released, continue to allow the movement of the curtain: the curtain remains in balance exclusively thanks to the springs with the risk, in the event of the springs breaking, that the curtain itself will descend at high speed.

[0094] As illustrated in [Fig.8], the actuation system 1 comprises a sensor group 50 comprising a first detector 51 configured to carry out a first detection of a first end-of-travel position of the movable closing wall and a second detector 52 configured to carry out a second detection of the first end-of-travel position of the movable closing wall.

[0095] The first detector 51 and the second detector 52 are configured to respectively generate a first signal and a second signal as a function of the first and second detection of the first end-of-travel position.

[0096] The actuation system 1 comprises a control unit in communication at least with the first motor 10 and with the sensor group 50.

[0097] The control unit is configured to receive the first and second signals.

[0098] The sensor group 50 comprises a third detector 53 configured to carry out a first detection of a second end-of-travel position of the movable closing wall and a fourth detector 54 configured to carry out a second detection of the second end-of-travel position of the movable closing wall.

[0099] The third and fourth detectors 53, 54 are configured to generate a third and fourth signal as a function of the first and second detection of the second end-of-travel position.

[0100] The control unit is configured to receive the third and fourth signals.

[0101] In one embodiment, the detectors 51, 52, 53 and 54 are switches.

[0102] The sensor group comprises an actuating element 55 constrained to translate along a first longitudinal axis between a first position, corresponding to the first end-of-travel position of the movable closing wall, and a second position, corresponding to the second end-of-travel position of the movable closing wall.

[0103] The actuating element 55, at the first position, comes into contact with the first detector 51 and the second detector 52.

[0104] The actuating element 55, at the second position, comes into contact with the third detector 53 and the fourth detector 54.

[0105] In one embodiment, the actuating element 55 is a cam.

[0106] As illustrated in [Fig.9], the sensor group 50 comprises:

[0107] - a drive element 58, constrained so as to rotate around a second longitudinal axis, preferably parallel to the first longitudinal axis,

[0108] - a first and a second contact element 56, 57 secured to the element drive 58 and configured to move along the drive member 58.

[0109] In one embodiment, the drive member 58 is essentially a screw and the first and second contact members 56, 57 are lead screws.

[0110] The actuating element 55 is moved towards the first, second, third and fourth detectors 51, 52, 53, 54 by the movement of the contact elements 56, 57 on the driving element 58.

[0111] Advantageously, having a double control, i.e. two detectors for each end-of-travel position of the movable wall, guarantees high safety during the motor stopping phases at the upper and lower limits of the movable wall.

[0112] In the event of failure of the first detector, in fact, the second detector is present.

[0113] The actuating element 55 is in fact capable of acting simultaneously on the two detectors 51, 52 or on the detectors 53, 54.

[0114] In one embodiment, illustrated in [Fig. 10], the actuation system 1 comprises an anti-fall device 60 configured to interact with the toothed crown 2 and block its rotation.

[0115] The expression "fall prevention device" designates a device capable of intervening, in the event of abnormal closure, on the movable closure wall to block its closure; in short, this device blocks the fall of the movable closure wall, so as to avoid damage to it and / or to people close to the closure itself.

[0116] The toothed crown 2 has a first housing 61.

[0117] The anti-fall device 60 is arranged in the first housing 61.

[0118] In other words, the anti-fall device 60 is entirely contained in the toothed crown 2.

[0119] Advantageously, the fall arrest device can be introduced and removed from the housing 61 at any time.

[0120] Whether the actuation system 1 is of the single-engine or twin-engine type, it is possible to add the fall arrest device 60 at any time, both during installation and after installation.

[0121] The actuation system 1 comprises first fixing means 62.

[0122] The anti-fall device 60 is locked to the toothed crown 2 in the first housing 61 by means of the first fixing means 62.

[0123] Preferably, the fixing means 62 comprise a plurality of screws, preferably 4.

[0124] The anti-fall device 60 comprises a tooth 63 configured to rotate between a first position 63A and a second position 63B to block the rotation of the toothed crown 2.

[0125] Advantageously, the device can be mounted at any time, even after the curtain has been installed.

[0126] In a preferred embodiment, the ring gear 2 comprises a cylindrical fixing element 70 configured to couple the ring gear 2 to the main shaft 100.

[0127] The actuation system 1 comprises second fixing means.

[0128] The cylindrical element 70 has a plurality of through holes 72 for housing the second fastening means configured to couple the cylindrical element 70 to the main shaft 100.

[0129] Advantageously, the cylindrical element 70 allows the correct positioning, at level, of the motor 10 on the main shaft 100.

[0130] The cylindrical element 70 with its holes prevents the motor 10 from being mounted obliquely relative to the main shaft 100, thus creating potential damage to the movable wall.

[0131] In one embodiment, illustrated in [Fig.2], the actuation system 1 comprises a second motor 80 having a second motor shaft, and a second reduction gear disposed between the second motor shaft and the ring gear. The second reduction gear 90 is coupled to the second shaft and is provided with a respective toothed member for meshing with the ring gear.

[0132] The second motor 80 and the second reducer 90 preferably have at least some of the characteristics set out above for the first motor 10 and the first reducer 20.

[0133] Generally, twin-engine actuation systems are not equipped with a fall arrest device.

[0134] The embodiment which provides a first and a second motor 10, 80 and an anti-fall device 60 therefore allows an increase in safety compared to known actuation systems.

[0135] This is made possible by the anti-fall device 60, illustrated in the attached figures, which is characterized by a particularly reduced size, also compatible with a twin-engine solution.

[0136] The actuation system 1 comprises a main shaft positionable in an upper end of the access section and coupleable to the movable closing wall.

[0137] As illustrated in [Fig. 13], the toothed crown 2 is coupled to said main shaft 100.

[0138] The actuation system 1 comprises a plurality of cylindrical housings rotatably associated with the main shaft 100 for rotating thereon and capable of being coupled to the movable closing wall.

[0139] The actuation system 1 comprises a plurality of elastic elements defining windings.

[0140] Each elastic element is fixed at its ends to the main shaft 100 and to a cylindrical housing 110.

[0141] Preferably, each cylindrical housing 110 has an outer side wall and comprises at least one ring element disposed on said outer side wall.

[0142] In a preferred embodiment, a pair of ring members are disposed on said outer wall at a first and a second end.

[0143] In a preferred embodiment, a pair of ring elements A is arranged on an outer wall of the ring gear 2.

[0144] Advantageously, these ring elements are anti-scratch rings.

Claims

Claims

1. A motorized actuation system for a movable wall for closing an access section of a room, said actuation system comprising: - a toothed crown (2) which can be rotatably coupled to a main shaft which can be positioned in an upper end of the access section and can be coupled to the movable closing wall and be fixed to the movable closing wall, - at least a first motor (10) having a first motor shaft (H), - a first reducer (20) arranged between the first motor shaft (10) and the toothed crown (2), the first reducer (20) being coupled to the first motor (10) and being provided with a respective toothed member (21) intended to mesh with the toothed crown, - a fall arrester (60) configured to interact with the toothed crown (2) and block its rotation, the toothed crown (2) having a first housing (61), the device fall arrester (60) being arranged in the first housing (61),- first fixing means (62) for fixing the anti-fall device (60) to the toothed crown (2) at the first housing (61).,

2. An actuation system according to claim 1, wherein the first fixing means (62) comprises a plurality of screws.

3. The system of claim 1 or 2, wherein the first motor comprises a coupling device (30) configured to couple the first reducer (20) to the first motor (10).

4. System according to claim 3, wherein the coupling device (30) comprises a coupling element (31) associated with the first motor shaft (11), said coupling element (31) comprising a first and a second tooth (31 A, 31B).

5. System according to claim 4, wherein the coupling device (30) comprises a transmission element (32) associated with the first reducer (20), said transmission element (32) having a first and a second cavities (32A, 32B) shaped so as to respectively house the first and the second tooth (31 A, 31B) of the coupling element (31).

6. The system of claim 5, wherein the coupling device (30) comprises an elastic element (33) configured to push the coupling element (31) against the transmission element (32).

7. An actuation system according to any one of the preceding claims, comprising a release system (40) configured to uncouple the first drive shaft (11) from the first reducer (20).

8. An actuation system according to claim 7, wherein the release system comprises a hooking element (41) coupled to the first motor shaft and a release fork (42) configured to move the hooking element (41) between a non-operational position (PI), in which it determines the uncoupling of the first motor shaft (11) from the first reducer (20) and an operational position (P2), in which it determines the coupling of the first motor shaft (11) with the first reducer (20).

9. Actuation system according to claims 5 and 8, wherein in the non-operational position (PI) the coupling element is uncoupled from the transmission element (32) and in the operation position (P2) the first coupling element (31) is coupled to the transmission element (32).

10. An actuation system according to claim 8 when dependent on claim 5 or according to claim 9, wherein in the operational position (P2) the first and second teeth (31A, 31B) of the coupling element (31) respectively occupy the first and second cavities (32A, 32B) of the transmission element (32).

11. An actuation system according to any one of claims 8 to 10, wherein the release fork (42) comprises a first portion (42A) and a second portion (42B) having a wedge-shaped conformation, the hooking element (41) having first and second ramps (41A, 41B) intended to come into contact with the first and second portions (42A, 42B) of the release fork (42) to move the hooking element (41) between the operational position (P2) and the non-operational position (PD-

12. An actuation system according to any one of the preceding claims, comprising a sensor group (50) comprising a first detector (51) configured to perform a first detection of a first end-of-travel position of the movable closing wall and a second detector (52) configured to perform a second detection of the first end-of-travel position of the movable closing wall, the first detector (51) and the second detector (52) being configured to respectively generate a first signal and a second signal as a function of the first and second detection of the first end-of-travel position.

13. An actuation system according to claim 12, comprising a control unit in communication at least with the first motor (10) and with the sensor group (50), the control unit being configured to receive the first and second signals.

14. Actuation system according to claim 13, wherein the sensor group comprises a third detector (53) configured to perform a first detection of a second end-of-travel position of the movable closing wall and a fourth detector (54) configured to perform a second detection of the second end-of-travel position of the movable closing wall, the third and fourth detectors (53, 54) being configured to generate a third and fourth signal as a function of the first and second detection of the second end-of-travel position.

15. An actuation system according to claim 13 or 14, wherein said sensor group comprises an actuation element (55) constrained to translate along a first longitudinal axis between a first position, corresponding to the first end-of-travel position of the movable closing wall, and a second position, corresponding to the second end-of-travel position of the movable closing wall.

16. An actuation system according to claim 15, wherein the actuation element (55), at the first position, contacts the first detector (51) and the second detector (52), at the second position, the actuation element contacts the third and fourth detector (53, 54).

17. An actuation system according to claim 15 or 16, wherein said sensor group (50) comprises: - a drive element (58), constrained to rotate about a second longitudinal axis, preferably parallel to the first longitudinal axis, - first and second contact elements (56, 57) secured to the drive element (58) and configured to move along the drive element, the actuating element (58) contacting the first contact element (56) at the first position and contacting the second contact element (57) at the second position.

18. An actuation system according to any preceding claim, wherein the ring gear (2) comprises a cylindrical fixing element (70) configured to couple the ring gear (2) to the main shaft (100).

19. An actuation system according to claim 18, comprising second fixing means, the cylindrical element (70) having a plurality of through holes (71) for housing the second fixing means.

20. A system according to any preceding claim, comprising a second motor (80) having a second drive shaft and a second reduction gear (90) disposed between the second drive shaft and the ring gear (2), the second reduction gear being coupled to the second shaft and being provided with a respective toothed member for meshing with the ring gear (2).

21. A system according to any preceding claim, comprising a main shaft (100) positionable in an upper end of the access section and coupleable to the movable closing wall, the toothed ring (2) being coupled to said main shaft (100).

22. The system of claim 21, comprising a plurality of cylindrical housings rotatably associated with the main shaft (100) for rotation thereon and couplable to the movable closure wall.

23. A system according to claim 22, comprising a plurality of elastic elements defining coils, each elastic element being fixed at its ends to the main shaft (100) and to a cylindrical housing (110).

24. An actuation system according to claim 22 or 23, wherein each cylindrical housing (110) has an outer side wall and comprises at least one ring element disposed on said outer wall.

25. An actuation system according to claim 24, comprising a pair of ring members disposed on said outer wall at first and second ends.

26. An actuation system according to any preceding claim, wherein the ring gear (2) comprises a respective pair of ring members (A).

27. An actuation system according to any one of the preceding claims, wherein the toothed crown (2) has a diameter between 180 mm and 195 mm, preferably 186 mm.

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