FR3041019A1 - ACTUATING MECHANISM FOR SECTIONAL DOOR AND SECTIONAL DOOR COMPRISING THE SAME - Google Patents

Abstract

The actuating mechanism (20) for sectional door apron, comprises a transmission member (21) having an inner face and an outer face and forming two strands (26, 27), the first (26) is adapted to cooperate with the door leaf and the second (27) is in coupling relation with a driving means (30) comprising a motor coupled to a motor roller and at least two return rollers, the motor and return rollers being staggered and being adapted to receive the second strand of the transmission member so that the transmission member is in contact, alternately by its inner face and by its outer face with each of the rollers, the pair of materials constituting respectively the transmission member and the rollers and the contact surface between the rollers and the second strand being such that the friction forces ensure non-slip adhesion when the rollers or the transmission member is in motion.

Description

Technical area.

The present invention belongs to the field of sectional doors, and more particularly relates to an actuating mechanism for sectional door apron, used to drive the deck between an open position and a closed position of a building bay, and Conversely. State of the art Generally, a sectional door consists of a movable deck, provided with guide members, in the form of wheels. The door is mounted inside a bay of a building, whose side jambs are provided with a guiding structure of the rail type or otherwise. This guide structure is designed to slidably accommodate the guide members of the deck. The deck is thus able to occupy a shutter position of the bay and an opening position of the bay. The apron is formed of panels articulated along horizontal axes, and is driven in the closed position or in the open position of the bay by an actuating mechanism.

Many types of sectional doors are known from the state of the art. Vertical sectional doors, in which the guide structure is entirely vertical, and sectional high-lift doors, whose guide structure comprises a vertical section joined at the top to a horizontal section, are among others.

Typically the mass of the sectional doors is compensated by a balancing mechanism to maintain the deck in an equilibrium position when the actuating mechanism no longer causes said deck.

The actuating mechanism of the apron generally comprises a cable, or a flat belt or trapezoidal shape. The cable or belt is wrapped around two drums located respectively at the lower and upper ends of one of the vertical guide structures. One of the drums is kinematically connected, via a drive shaft, to an electric geared motor fixed to the guide structure. Generally, these geared motors represent a large volume to take into account for the installation of the sectional door. This constraint prohibits the installation of such sectional doors in buildings whose spandrels are small. By corner, it is necessary to understand the part of wall formed between a lateral border of a bay and the angle of the wall nearest.

Moreover, because of the reduction gear ratio of the geared motor, for example of the order of 1/60, the operation of the deck is generally delicate, when the geared motor is not supplied with electricity, for example, during a break current. The mechanism is then called "irreversible" because the movement can be transmitted from the motor shaft to the deck but not in the opposite direction. However, for obvious safety issues, it is necessary to be able to operate the deck of the sectional door in all circumstances. For this purpose, there are disengagement mechanisms arranged near the geared motor, to release the drive shaft of the deck, and thus, to allow the free movement of the deck. US5557887 and US5581939 disclose such a device. The door apron, thanks to the release mechanism, is operable in all circumstances, but is not suitable for emergencies requiring rapid opening of the building bay. Such a situation is frequently found in the relief and assistance services.

In addition to presenting security problems, the devices of the prior art are often complex and expensive.

Statement of the invention.

The present invention aims to remedy all or some of the disadvantages mentioned. In particular, the invention provides an apron actuating mechanism, for all types of sectional doors, not requiring disengaging means for driving the deck in the open position of a building bay when the drive motor apron is not supplied with electrical energy. Therefore, the actuating mechanism is particularly compact, and can thus be used for sectional doors with low sparse value. For this purpose, the present invention aims at an actuating mechanism for a sectional door apron, comprising a member for transmitting movements generated by a drive means, the member having an internal face and an external face and being engaged, by its inner face, on a portion of the periphery of an upper return means and a lower return means, so as to form two strands, the first is adapted to cooperate with the apron of the door and the second is in coupling relation with the drive means, the drive means comprising a motor coupled to a motor roller rotatably mounted about a horizontal axis and adapted to transmit the torque of the motor, and at least two return rollers mounted in rotation, along a horizontal axis, on a support structure, the motor and return rollers being staggered and being able to receive, in partial winding on a portion of their periphery, the second strand of the transmission member so that the transmission member is in contact, alternately by its inner face and by its outer face with each of the rollers the pair of materials respectively constituting the transmission member and the periphery of the rollers, and the total contact surface between the rollers and the second strand being such that the frictional forces resulting from these contacts are such as to ensure non-slip adhesion when the rollers or the transmission member is in motion .

By the terms "staggered" are meant in the rest of the text, that the motor and return rollers are respectively disposed on either side of a median axis, that is, they are not arranged according to a alignment. The arrangement of the rollers staggered tends to increase the contact surface between the rollers and the transmission member, and thus to increase the friction forces at the origin of the phenomenon of adhesion. The contact transmission by adhesion is also obtained through the number of rollers involved, the materials constituting the rollers and the motion transmission member. The surface condition of the rollers and the motion transmission member is also a parameter to be taken into account in order to obtain sufficient frictional forces to drive the deck. The motion transmission is integrally made by adhesion, which simplifies the actuating mechanism, and thus reduce the manufacturing and selling costs of the mechanism and thus participate in the reduction of the final price of the sectional door with it . In addition, the compactness of the device allows its use in small spandrels. Furthermore, the transmission of movement by adhesion has the advantage of generating no noise during operation of the mechanism. Unlike a geared motor equipped with an irreversible gear train, because of its structure, the drive means is reversible, it does not require clutch means / clutch. The apron of the door can therefore be maneuvered without difficulty, if necessary.

According to preferred embodiments, the invention also fulfills the following characteristics, implemented separately or in each of their technically operating combinations.

According to particular features, the sectional door apron is intended to be driven into a closed position of a building bay by the drive means, via the transmission member, and is intended to be driven into a position opening of the building bay by the elastic force of elastic members of a mechanism of overcompensation of the weight of the deck.

Thus, the door apron can occupy an opening position of the building bay in all circumstances, in particular without the use of electrical energy, and in a relatively fast and reliable manner. This provision is particularly interesting for the relief and assistance services.

According to particular features, a drive carriage rigidly fixed to the first strand is adapted to cooperate with the door apron to drive the door in the closed position of the building bay.

According to particular features, the motor roller and the motor are fixed to a tilting support, articulated to the support structure along a horizontal pivot axis, so that the motor roller is able to occupy a first position in which it is in contact with the rollers, and a second position that it is removed from the idlers.

By this arrangement, in the first position, the motor roller is able to exert a bearing force on each of the return rollers. These bearing forces play an important role of pinching the transmission member, participating in the improvement of the adhesion of the transmission member on the rollers. The value of the pressing force exerted by the motor roller is proportional to the value of the voltage of the transmission member. Therefore, even in the presence of an abnormally high force on the transmission member, which would cause a significant tension of this member, there would be no risk of sliding of the transmission member on the rollers of the pinch caused by the support forces.

Another advantage of this arrangement lies in the fact that, in the position of removal of the motor roller, the movement transmission member is easy to access, and its handling is easy, especially in the case where it would be necessary to replace it. The maintenance operations of the transmission member are thus facilitated.

According to another characteristic of the invention, the motor roller is held in first position under the effect of the force exerted by the weight of the rocking support, said motor roller exerting a bearing force F on the return rollers with which it is in contact.

Furthermore, the support force is at the origin of a pinching effect of the transmission member, thereby increasing the phenomenon of adhesion between the rollers and the transmission member.

According to an additional feature of the invention, a drive wheel is coupled to an output shaft of the engine, a receiving wheel is coupled to the drive roller and a belt is in meshing relationship with the two wheels.

According to another characteristic of the invention, the movement transmission member is constituted by a polyester fiber webbing, and each roller consists of a bearing by which it is movable in rotation, the periphery of which is covered with a polyurethane crown.

It is known that the value of the coefficient of friction of the pair of polyester / polyurethane materials is of the order of 1, these materials thus provide slip-free adhesion.

According to another characteristic of the invention, the return rollers are arranged so that the minimum distance between the periphery of each return roller is less than the diameter of the motor roller.

According to another characteristic of the invention, the actuating mechanism comprises an automatic locking system of the apron, intended to oppose the movement of said apron to the open position of the bay when said apron is in the closed position from the bay.

According to another characteristic of the invention, the automatic locking system comprises an electromagnetic actuator attached to a jamb of the building bay intended to cooperate with a magnet fixed to the deck of the sectional door when said deck is in the closed position of the the Bay

According to another aspect, the present invention provides a sectional door mounted in a building bay, comprising an apron, and comprising an apron actuating mechanism according to one of the preceding claims, the actuating mechanism being able to actuate the apron of the door from a shutter position of the bay to an open position of the bay, and vice versa.

Brief presentation of figures and drawings. Other advantages, aims and features of the present invention will appear on reading the description of at least one preferred embodiment, given by way of non-limiting example with reference to the appended drawings, in which: FIG. 1 is a schematic view of a sectional door having an actuating mechanism as claimed; - Figure 2 is a schematic view of the actuating mechanism, in which the motor roller is in a first position; - Figure 3 is a schematic view of the actuating mechanism, in which the motor roller is in a second position, - Figure 4 is a schematic view of the sectional door according to Figure 1, wherein the door leaf is in the open position of the 5 is a schematic view of the sectional door according to FIG. 1, in which the door leaf is driven into the closed position of the door. the building bay, - Figure 6 is a schematic view of the sectional door according to Figure 1, wherein the door leaf is in the closed position, and the drive carriage is in a transient position.

Detailed description of the invention

Figures 1, 4, 5 and 6 show a sectional door 10 mounted in a building bay, comprising an apron 11 having a plurality of panels articulated to each other along horizontal axes and an actuating mechanism 20 of the deck 11. The building bay comprises in a manner known per se, vertical side jambs supporting a horizontal lintel away from the ground. The legs are provided with a guide structure, for example guide rails, also known to those skilled in the art, extending along each leg. The panels are provided on their lateral flanks with guide members, such as wheels, designed to slide or roll in the guide structures of the jambs of the bay.

The present invention relates to an actuating mechanism 20 of sectional door apron 11 capable of actuating the deck 11 from a closed position of the bay to an open position of the bay, and vice versa, such as it is partly shown in a preferred embodiment in FIGS. 2 and 3. The actuating mechanism 20 comprises a mechanism for overcompensating the weight of the deck 11, not shown in the figures, intended to be associated, on the one hand, with to the building and secondly to the deck 11. The term "over-compensation of weight" that the mechanism is able not only to compensate the weight of the deck 11 of the door 10, but also to drive the deck in position d opening of the bay.

The actuating mechanism 20 of the deck 11 of the door 10 further comprises a drive carriage 28 driven by a drive means 30 of the deck 11 as shown in detail in FIGS. 2 and 3. trolley 28 is intended to drive the deck 11 in the closed position of the bay, and is provided for sliding in one of the jamb guide structures of the bay as shown in Figures 1,4, 5 and 6.

The actuating mechanism 20 comprises a transmission member 21 to the deck 11, movements generated by the drive means 30, through the drive carriage 28 of the deck 11. This 21 transmission member has a movement internal face 22 and an outer face 23, and is partially wound, by its inner face 22, on a portion of the periphery of an upper return means 24 and a lower return means 25, so as to form two strands 26 and 27. The return means may be pulleys, rollers, or any other means known to those skilled in the art. A first strand 26 is in cooperative relationship with the apron 11 via the drive carriage 28 in an embodiment described hereinafter, and the second strand 27 is in mating relation with the drive means 30. As shown in FIG. shown in Figure 1, the upper return means 24 and lower 25 are respectively rotatably mounted near the upper and lower ends of one of the jambs of the bay.

Preferably, the transmission member 21 is formed by a transmission strap of woven polyester fibers, but may be constituted by a smooth flat belt made of synthetic material or by any other means of motion transmission.

As shown in FIGS. 2 and 3, the drive means 30 of the deck 11 comprises a motor 31 coupled to a motor roller 32 rotatably mounted along a horizontal axis and capable of transmitting the torque of the motor 31, and two return rollers. 33. In alternative embodiments, the drive means 30 comprises more than two return rollers 33, for example four. The return rollers 33 are mounted free to rotate, along a horizontal axis, on a support structure 34 fixed to the jamb of the bay, in the path of the second strand 27 of the transmission member 21. Preferably the motor 31 is a motor DC electric and permanent magnet. Thus, it is possible to use a motor of low power, low cost of purchase, having a very good performance, and requiring reduced maintenance because of its low wear. This engine, low power, also has the advantage of consuming little electricity.

The rollers 32 and 33 are staggered on either side of a median vertical axis AA ', and are able to receive, in partial winding on a portion of their periphery, the second strand 27 of the transmission member. 21 so that the transmission member 21 is in contact, alternately by its inner face 22 and its outer face 23 with each of the rollers 32 and 33. In this way, the total contact surface between the rollers 32 and 33 and the second strand 27 is sufficient so that the frictional forces resulting from these contacts are such as to ensure non-slip adhesion when the rollers 32, 33 or the transmission member 21 is in motion.

During operation of the motor 31, the drive of the second strand 27 is only achieved by adhesion.

Preferably, the return rollers 33 are arranged so that the minimum distance between the periphery of each return roller 33 is less than the diameter of the motor roller 32, as represented in FIGS. 2 and 3. By maximizing the friction surface between the rollers 32 and 33 and the transmission member 21, this feature aims to maximize the friction forces involved. Indeed, for rollers 32 and 33 of given dimensions, the total contact surface between the transmission member 21 and the rollers 32 and 33 is larger when the minimum distance between the periphery of the two return rollers 33 is smaller than the diameter of the motor roller 32, when this distance is equal to or greater than the diameter of the motor roller 32. Another advantage of this characteristic is to participate in the compactness of the device insofar as, with a given friction surface, the diameters of the rollers 32 and 33 are less important. ts when the minimum distance between the periphery of the two return rollers 33 is smaller than the diameter of the motor roller 32, when this distance is equal to or greater than the diameter of the motor roller 32.

Preferably, the motor roller 32 and the motor 31 are fixed to a tilting support 35 hinged to the support structure 34 along a horizontal pivot axis 39. The tilting support 35 is able to occupy two extreme positions. In a first extreme position of the tilting support 35, the motor roller 32 occupies a position in which it is in contact with at least two return rollers 33, and in a second extreme position of the tilting support, the motor roller 32 is moved away from each Return roller 33. One of the advantages of the second position is to facilitate the maintenance operations of the transmission member 21, which is more accessible in this position than in the first position.

In one embodiment of the invention, the motor 31 is coupled to the motor roller 32 by any motion transmission means. In the preferred embodiment, the motion transmission means is formed by a wheel, for example a toothed, driving wheel 36 coupled to an output shaft of the motor 310, by a wheel, for example toothed, receiving 37 coupled to the motor roller 32 and by a synchronous belt 38, in meshing relation with the two wheels 36 and 37. For information, the reduction ratio of the transmission means is, for example, 1/6.

In an alternative embodiment, the motor roller 32 is coupled directly to the output shaft of the motor 310. The axis of rotation of the tilting support 35 is arranged so that the motor roller 32 is maintained in the contact position under the effect of the force exerted by the weight of the tilting support 35 as visible in Figures 2 and 3. The weight of the tilting support 35 comprises the weight of the elements that said support carries. In a preferred embodiment, the tilting support 35 is substantially rectangular in shape, and the center of rotation of the support is located at a distance from a vertical median axis BB 'of the support, so as to cause the support 35 to tilt towards the With the effect of this tilting, the motor roller 32 is forced to exert a bearing force F on the return rollers 33 with which it is in contact.

Preferably, the point of contact between the motor roller 32 and each return roller 33 belongs to a geometrical axis passing through the center of the motor roller 32 and by the center of each return roller 33. Thus, the direction of the force of support F on each return roller 33 is normal to the tangent of the diameter of each said roller 33. As a result, the bearing forces F play an important role of pinching the transmission member 21, participating in the improvement the adhesion of the transmission member 21 on all the rollers 32 and 33.

In an alternative embodiment, the actuating mechanism 20 of apron 11 of sectional door 10 does not comprise tilting support 35, all of the rollers 32 and 33 being rotatably mounted on the same support 34. In this variant, the motor roller 32 can be mounted at a distance from the return rollers 33 or in contact with the return rollers 33.

In the preferred embodiment, all the rollers 32 and 33 are composed of a bearing known per se, by which they are rotatable, and whose periphery is covered with a polyurethane ring. The pair of polyester / polyurethane material having a coefficient of friction whose value is of the order of 1, the contact between the rollers 32 and 33 and the transmission member 21 is made without slipping during operation of the mechanism. Alternatively, as materials of the rollers 32 and 33 and the transmission member 21, is selected a pair of materials having a coefficient of friction whose value is close to or equal to one.

Thus, whatever the position of the tilting support 35, any rotation of the output shaft 310 of the motor 31 causes the actuation of the drive carriage 28.

Furthermore, the drive means advantageously has the particularity of being fixed at all levels of height relative to the ground. Thus, in addition to the compactness of the device, to solve the problems related to the size, it is possible to fix the drive means so as to optimize the space, for example near the lintel or near the ground. However, for reasons of accessibility of the actuating mechanism 20, in particular to facilitate maintenance, said mechanism is preferably fixed at human height on one of the jambs of the bay.

In the preferred embodiment, as indicated above, the actuating mechanism 20 comprises a mechanism of overcompensation of the weight of the deck 11 for driving the deck 11 of the sectional door 10 in the open position of the building bay. Advantageously, the overcompensation mechanism of the weight of the deck 11 differs from the known weight compensation mechanisms in that it comprises elastic members whose elastic characteristics are such that said overcompensation mechanism is able to drive the deck 11 into position. opening of the building bay, regardless of the position of the deck 11. Thus, when closing the bay, the elastic members of the compensation mechanism are biased so as to store elastic potential energy. The dissipation of this elastic potential energy is at the origin of the opening of the bay, due to the generation of elastic return forces. As a result, the apron 11 is constantly biased towards the opening position of the bay by the elastic return forces.

The drive carriage 28 is rigidly fixed to the transmission member 21. Advantageously, the drive carriage 28 is intended to occupy, on the one hand, a rest position in which it is located at an upper end of the guiding structure, as shown in Figure 1, and secondly, a transient position in which it is located at a lower end of the guide structure, as shown in Figure 6.

The drive carriage 28 is, for example, provided with two rolling members intended to roll or slide in one of the guiding structures and a means of cooperation with the apron 11 of the door 10, for example in the form of a training finger. The means of cooperation with the apron 11 of the door 10 is able to secure the apron 11 and the drive carriage 28 when said carriage 28 moves from the rest position to the transient position, as illustrated in FIG. 5, so that the carriage 28 can drive the apron 11 in the shutter position of the bay. In addition, the cooperation means is able to separate the deck 11 and the carriage 28 when said carriage 28 moves from the transient position to the rest position, so that the carriage 28 can return to the rest position when the deck 11 is in the closed position of the bay, as shown in Figure 1. The action of the finger of the carriage 28 on the deck 11 thus goes against the elastic return forces applied to the deck 11, when the carriage 28 is driven to the transient position.

After driving the apron 11 of the door 10 in the closed position of the bay, the drive carriage 28 is immediately moved to the rest position by the actuation of the transmission member 21 by the motor 31 driven by position sensors whose operation is described below, as illustrated by FIGS. 6 and 1. This is so that the finger of the carriage 28 does not obstruct the apron 11 in the event that said apron 11 is immediately driven into the position of Opening the bay by the overcompensating weight mechanism after occupying the bay shutter position. However, because of the reversibility of the drive means 30, in the case where the deck 11 would be driven to the open position of the bay immediately after occupying the closed position of the bay, while the carriage 28 n is not in the rest position, the elastic restoring forces generated on the apron would be sufficient to drive the carriage 28 in the rest position, while driving the deck 11 in the open position of the bay.

Thus, it is not necessary that the sectional door 10 comprises a disengagement and clutch means for the apron 11 of the door 10 is manipulable. Advantageously, the apron 11 of the door 10 is immobilized, when in the closed position of the bay, by an automatic locking system 40 of the deck 11 associated with the actuating mechanism 30, as represented by FIGS. , 4, 5 and 6. The locking system 40 is intended to oppose the movement of said apron 11 to the open position of the bay when said apron 11 is in the closed position of the bay.

This automatic locking system 40 is, for example, located at the foot of one of the jambs of the sectional door 10, and preferably contiguously to the guide structure in which the drive carriage 28 moves.

This locking system 40 preferably comprises an electromagnetic actuator intended to be kept in contact with a magnet integral with the deck 11, when the deck 11 is in the closed position of the bay, by means of the magnetic force produced. In a manner known per se, the electromagnetic actuator is able to break the magnetic contact with the magnet secured to the deck 11, via a suitable control, to release the deck 11 from the shutter position of the bay to the position of opening of the bay.

In other embodiments, the automatic locking system may be formed of any locking means known per se.

Such an automatic locking system is necessary because the apron 11 is constantly biased towards the opening position of the bay by the elastic return forces of the overcompensation mechanism weight.

Advantageously, the guiding structure, at each of its ends, comprises position sensors connected to a control and control unit of the motor 31, said sensors being able to send a signal representative of the position of the apron 11 of the door 10 to the control unit and control, as the deck 11 is in the closed position or opening of the bay.

Thus, when the apron 11 of the door 10 is in the closed position of the bay, the rotation of the output shaft 310 of the motor 31 is stopped by the control and control unit of the motor 31, and then driven by in the opposite direction so as to move the carriage 28 from the transient position to its rest position. The interest of such a system, besides the locking function, is to meet the standards in force relating to the safety provisions of sectional doors. Indeed, if the signal of the position sensor has not been sent while a predetermined duration of operation of the engine is completed, the rotation of the output shaft of the motor, and therefore the driving of the deck 11 is stopped by the control and command unit. Thus is detected any obstacle present under the apron 11.

Advantageously, the actuating mechanism comprises braking means capable of braking the door leaf when it is driven towards the opening position of the bay, so as to generate a gradual decrease in the speed of the deck to what it occupies the opening position of the bay.

These braking means may be hydraulic or pneumatic dampers known per se, arranged so as to absorb the kinetic energy of the deck developed during its movement to the opening position of the bay.

It goes without saying that the present invention can receive any arrangements and variants of the field of technical equivalents without departing from the scope of this patent as defined by the claims below.

Claims (11)

An actuating mechanism (20) for a sectional door apron (11) comprising a transmission member (21) for movements generated by a drive means (30), the member having an inner face (10). 22) and an outer face (23) and being engaged, by its inner face (22), on a portion of the periphery of an upper return means and a lower return means, so as to form two strands ( 26, 27), of which the first (26) is able to cooperate with the apron (11) of the door (10) and the second (27) is in mating relation with the drive means (30), characterized in that: the drive means (30) comprises a motor (31) coupled to a motor roller (32) rotatably mounted about a horizontal axis and capable of transmitting the torque of the motor (31), and at least two return rollers (33) rotatably mounted along a horizontal axis on a support structure (34), the motor (32) and return (33) rollers being staggered and being adapted to receive, in partial winding on a portion of their periphery, the second strand (27) of the transmission member (21) so that the transmission member (21) is in contact, alternatively by its inner face (22) and its outer face (23) with each of the rollers (32, 33), the pair of materials respectively constituting the transmission member (21) and the periphery of the rollers (32, 33), and the total contact area between the rollers (32, 33) and the second strand (27) being such that the frictional forces resulting from these contacts are such as to provide non-slip adhesion when the rollers (32, 33) or the transmission member (21) is in motion. An actuating mechanism (20) for a sectional door apron (11) according to claim 1, wherein the sectional door apron (11) is adapted to be driven into a closed position of the door (11). a building bay by the driving means (30), via the transmission member (21), and is intended to be driven into an opening position of the building bay by the elastic return force of elastic members of a mechanism of overcompensation of the weight of the deck. Actuating mechanism (20) for a door (11) of sectional door (10) according to one of claims 1 or 2, wherein a drive carriage (28) rigidly fixed to the first strand (26) is suitable to cooperate with the apron of the sectional door (10) to drive the door in the closed position of the building bay. An actuating mechanism (20) for a sectional door apron (11) according to one of the preceding claims, wherein the motor roller (32) and the motor (31) are attached to a tilting support (35). ), articulated to the support structure (34) along a horizontal axis pivot (39), so that the motor roller (32) is adapted to occupy a first position in which it is in contact with the return rollers (33), and a second position in which it is remote from the idlers (33). An actuating mechanism (20) for a door (11) of sectional door (10) according to claim 4, wherein the motor roller (32) is held in first position under the effect of the force exerted by the weight of the tilting support (35), said motor roller (32) exerting a bearing force (F) on the return rollers (33) with which it is in contact. An actuating mechanism (20) for a sectional door deck (11) according to one of the preceding claims, wherein a driving wheel (36) is coupled to an output shaft (310) of the engine ( 31), a receiver wheel (37) is coupled to the motor roller (32) and a belt (38) is in meshing relationship with the two wheels (36, 37). Actuating mechanism (20) for a sectional door apron (11) according to one of the preceding claims, wherein the movement transmission member (21) is constituted by a polyester fiber webbing, and wherein each roller (32, 33) is constituted by a bearing by which it is rotatable, the periphery of which is covered with a polyurethane ring. Actuating mechanism (20) for a door (11) of sectional door (10) according to one of the preceding claims, wherein the return rollers (33) are arranged so that the minimum distance between the periphery of each return roller (33) is smaller than the diameter of the motor roller (32). 9. Actuating mechanism (20) for sectional door apron (11). (10) according to one of the preceding claims, comprising an automatic locking system (40) of the deck (11) for opposing the movement of said deck to the open position of the bay when said deck is in shutter position of the bay. An actuating mechanism (20) for a door (11) of sectional door (10), according to the preceding claim, wherein the automatic locking system (40) comprises an electromagnetic actuator attached to a jamb of the building bay for to cooperate with a magnet fixed to the deck (11) of the sectional door (10) when said apron (11) is in the closed position of the bay. 11. Sectional door (10) mounted in a building bay, comprising an apron (11), characterized in that it comprises an actuating mechanism (20) apron (11) according to one of the preceding claims, the actuating mechanism (20) being able to actuate the deck (11) of the door (10) from a shutter position of the bay to an open position of the bay, and vice versa.