EP2710215A1

EP2710215A1 - Electromechanical actuator head for handling a roll-up element

Info

Publication number: EP2710215A1
Application number: EP12721850.1A
Authority: EP
Inventors: Serge Bruno; Sébastien LEMAITRE
Original assignee: Somfy SA
Current assignee: Somfy Activites SA
Priority date: 2011-05-17
Filing date: 2012-05-16
Publication date: 2014-03-26
Anticipated expiration: 2032-05-16
Also published as: CN103620152B; EP2710215B1; FR2975426A1; WO2012156471A1; CN103620152A; FR2975426B1

Abstract

The invention relates to a head (2) of an electromechanical actuator (1) for controlling a roll-up element (10), including; an element (20, 24) for mechanically linking to a body (3) of the actuator without rotational play; at least two torque take-up arms (22, 22a, 22b) suitable for engaging with an accessory (8) for attaching to a frame (9); at least one first part (25a) capable of being deformed by torque which is applied to the actuator, wherein the actuator head is characterized in that the first deformable part is built into a first torque take-up arm (22a).

Description

Electromechanical actuator head of manoeuver

a rollable element.

The invention relates to the field of electromechanical actuators for motorized control of the occultation or sun protection elements in a building, such as blinds, shutters. In particular, it relates to an actuator adapted to control in rotation of a winding tube, on which is wound a rollable element.

It is known in particular documents FR2790787, EP2167776 and WO2007 / 51865 to provide force detection devices exerted by a screen or rollable element, especially in case of obstacle present on the path thereof or attempted intrusion for example, on the winding tube and therefore on the actual body of the actuator. The known devices of the state of the art involve most of the time the creation of a mechanical game between parts constituting the actuator. In operation, the torque applied to the actuator creates a catch-up of this game. The backlash of play or conversely a return to a position of equilibrium allows the detection of normal and abnormal operating situations, such as for example the presence of a obstacle on the path of the screen. Various types of sensors may be associated with angular position detection, including Hall effect sensors, resistive tracks, piezoelectric elements or electronic motion sensors.

The application WO2007 / 51865 also describes an embodiment (FIG. 10), in which the clearance is created not between the head and the body of the actuator, but between the head and an accessory for mounting the actuator on the building (called in English "wall bracket"). Elastic parts are also added between the head and the accessory. This embodiment involves adding detection elements (an electronic circuit and Hall effect sensors) between the head and the accessory. The integrated mechanical assembly then comprises the actuator, the wall accessory and the detection elements. The problem mentioned above is displaced but remains equivalent. If the components of the assembly (actuator on the one hand and accessory on the other hand) are separable and mounted by the installer on site, another problem related to this embodiment becomes accessibility to the electronic circuit: it is not protected and may be damaged during assembly. In addition, the electrical connections are more complex.

The patent application EP2167776 describes an obstacle detection device or abut stop similar to the previous ones, but using the remote measurement of an electronic motion detector, such as for example an accelerometer or a gyro sensor. This request is based on the use of a remote sensor in relation to the zone where the game is generated, to avoid any need for wiring between the measuring zone of the force or rotation and the zone of measurement. integration of the measure. It does not respond well to the ease of integration or assembly, insofar as additional elastic parts must be inserted between the actuator and a fixed support (caisson which surrounds the screen, the winding tube and the actuator, or frame). On the other hand, an adjustment of the elastic element, in particular the tension of a spring is possible but complex, because it mainly requires acting at the connection between the spring and the fixed support. All of these aspects make it extremely difficult to assemble the actuator on site.

A first object of the invention is to detect a force exerted on a roll-up screen, without this implying the creation of a mechanical play at the level of the actuator itself. Keeping rigid connections between the various components of the actuator, in particular at the end of the actuator which must be connected to the frame, simplifies its design and assembly, its resistance to external climatic elements and its integrity over time. A second objective is to simplify its mounting to the frame, using as much as possible the accessories available on the market and compatible with other actuators.

A third goal is to minimize the settings when installing the actuator at the window.

A fourth objective is to maintain compatibility with existing accessories on the market to simplify the replacement of an actuator by a fine-obstacle detection actuator.

The object of the invention is to provide an actuator head or an accessory remedying the disadvantages mentioned and improving the heads known from the prior art. In particular, the invention proposes to provide a simple head or accessory to simplify the mounting of an actuator and to avoid any risk of damaging the electronics during its assembly.

According to the invention, the electromechanical actuator head for operating a windable element comprises:

a mechanical connection element to a body of the actuator without rotating play,

at least two torque recovery branches adapted to cooperate with a mounting accessory to a frame,

at least a first deformable part under the action of a torque to which the actuator is subjected. The first deformable part is integrated at a first torque recovery branch.

According to the invention, the attachment accessory of an electromechanical actuator for operating a windable element to a frame, comprises:

a mechanical connection element to the frame without rotating play, at least two torque recovery branches adapted to cooperate with a head of the actuator,

- At least a first deformable part under the action of a torque to which the actuator is subjected.

The first deformable part is integrated at a first torque recovery branch. The first deformable part can penetrate, in particular be fixed in a recess provided at the first branch.

The deformable part may be an elastomer, stressed in compression during the application of the torque to which the actuator is subjected.

The first branch may comprise an expansion zone intended to facilitate the deformation of the elastomer during its compression.

The head or the accessory may comprise a first non-deformable contact element under the action of the couple, the first contact element being distinct from the first deformable part.

The contact element can be integrated with a second external branch of the head or the accessory. The head or the accessory may comprise a second deformable part and a second non-deformable contact element.

According to the invention, an electromechanical actuator for operating a windable element around a winding tube comprises:

a tubular body,

a head defined above, the head being mechanically linked without play to the tubular body and comprising at least two torque recovery branches adapted to cooperate with an attachment attachment to a frame,

a motor, and

a control unit.

The control unit may include an angular position detection module, adapted to determine the angular position of the actuator from the measurements provided by an angular position sensor.

The angular position sensor can be remote and without contact with the elastic contact piece.

The angular position sensor can be implanted out of the head.

The control unit may comprise an element for automatically determining an angular position threshold from which the motor must be deactivated.

According to the invention, the maneuvering installation of a windowing element for concealment, closure, sun protection or screen comprises: at least one accessory, in particular a fixing accessory defined above, adapted to be mounted on a fixed support, and / or an actuator, in particular an actuator defined above, the actuator being mounted with the possibility of angular deflection in the fixed support. At least one branch of the actuator head is mounted without play in a part of the accessory.

The accessory and the actuator can only cooperate mechanically, without requiring a module for detecting their relative angular position.

The actuator and / or the accessory can comprise mounting means such that the actuator can be mounted in a plurality of angular positions with respect to the fixed support, in particular in more than two angular positions.

The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings in which:

Figure 1 is a longitudinal sectional view of an embodiment of an installation comprising a head or an actuator according to the invention. Figure 2 shows two branches of a head according to the invention.

Figures 3 and 4 are views of an embodiment of a head according to the invention.

FIG. 5 represents graphs of a raw and filtered torque signal derived from a sensor mounted in an actuator equipped with a head according to the invention.

Figure 6 is a graph showing a first evolution of a determined torque at the actuator.

Figure 7 is a graph showing a second evolution of a determined torque at the actuator. Figure 8 is an embodiment of a branch of an actuator head.

FIG. 1 represents a plant 100 comprising a tubular actuator 1 for maneuvering a closure, concealment, sun protection or screen device. The tubular actuator 1 comprises a fixed point or head 2, a tubular body 3 and an output shaft 4 rotatable along the axis X-X 'of the tubular body of the actuator. The output shaft is connected to a winding tube 5, in which the actuator is engaged, by a drive wheel 6. A bearing 7 allows the rotational guidance of the winding tube on the tubular body of the actuator. An attachment accessory 8 connects the fixed point to a frame 9 (including a window frame). A windable element 10, shown in phantom, is fixed by one of its ends to the winding tube, the windable element occulting the window when it is unwound. The windable element can be a shutter, a screen, a grid or a canvas.

The fixed point, otherwise known as the "head" of the actuator, is an end piece which supports a portion of the weight of the actuator, the winding tube and the windable element, and which fully supports the torque of the actuator. the actuator.

The attachment accessory connecting the fixed point or head to the frame is adapted to be securely attached to the frame, for example by means of bolts on a metal frame or with peg screws (not shown). The connection of the head to the attachment accessory is preferably detachable, that is to say easily locked or unlocked, so as to facilitate the installation or maintenance of the windable element or actuator. For this purpose, specific fastening elements comprise, for example, clipping means elastic and forms adapted to the simultaneous recovery of weight and torque, for example as described in patent EP468925 or EP1 106774. These fasteners are included or not in the accessory and / or in the head.

The head 2 is connected without play to the tubular body. It comprises for this purpose a tubular portion 20 adapted to engage the tube 3, either in direct contact thereof by a tight fitting, or by direct contact with another element in contact with the tube, for example a tube insulation (not shown) required by the electrical insulation of control means included in the actuator tube or by the sound insulation of the actuator. The outer diameter of this tubular portion is for example substantially equal to the inside diameter of the tube 3. A dotted line represents the tubular portion 20 of the fixed point 2 engaged in the tubular body 3.

The head and the body are fixed axially to one another by means of a screw or by clipping (means not shown). The tubular body also comprises at least one lumen 30 at a first end, cooperating with a longitudinal shoulder or longitudinal boss 24 provided on the tubular portion of the head. In this way, the tube can not move angularly vis-à-vis the head. The tubular portion 20 and the longitudinal shoulder form a mechanical connecting element of the head to the body 3 of the actuator. This connection is preferably without rotating play.

The tubular portion is rigidly connected to a base 21 at least substantially circular in a plane perpendicular to the axis of the tube, outside the tube and having reliefs or branches 22 adapted to be housed in corresponding or complementary forms of the accessory of 8. Various locking means are provided for ensure the maintenance of the base in the mounting accessory in rotation and / or in translation. The tubular portion and the base may be formed integrally or form a single piece by their rigid connection with known means not shown. The head and the base are made mainly of rigid plastic material, by molding or extrusion.

A control module 40 for controlling a motor 99 is housed inside the tubular body.

The control module comprises motor control means 41 such as, for example, a counting device, an automatic end-of-travel module of the windable element, an automatic engine stop module in response to the presence of an obstacle or a stop module in the intermediate position or any other control module capable of executing a particular engine control program. The control means are represented schematically by an electronic assembly representing the various electronic components, mounted on an electronic card 42, for example a printed circuit.

One end of this electronic card can be embedded in the head for its maintenance, or as shown, the control module can be held by a support 43, also called bath, itself held relative to the tube and / or the head .

The tracks of this card 42 are electrically connected, via connectors not shown, to a wired connection 44. The wired connection makes it possible to supply the electronic card and the motor electrically via the control module. A cavity 23 shown in Figures 3 and 4 is provided in the head for the passage of the wired connection (plug and cable).

The control module also comprises a module 50 for detecting the angular position of the actuator, shown separately from the motor control means 41 for reasons of readability. This detection module comprises, for example, an electronic sensor for movement or acceleration, an inclinometer or other component of the same type (angular position sensor). It cooperates with information processing means, these being notably understood at the level of the motor control means. The detection module is intended to detect an absolute angular position with respect to a stable position, for example linked to an earth marker based on the gravity or a relative angular position of the actuator vis-à-vis a position of reference, for example the angular position at the start of a movement. The detection module may be mounted on the printed circuit or be positioned separately, for example in the form of an overmoulded component (MID Molded Interconnect Device) outside the printed circuit. It can in this case easily be positioned at the most appropriate place of the actuator.

The head 2 comprises at least two branches of substantially equivalent external dimensions. A first branch 22a includes a first deformable part 25a, deformable under the action of a torque to which the actuator is subjected. An integration of the deformable part at a branch means in particular that the deformable part is included totally or in the major part, on the branch and / or inside thereof. The deformable part can be supported or held by a rigid part, which is not necessarily integrated with the first branch. The head also comprises a first contact element 25b distinct and non-deformable under the action of the same pair, for example included at a second branch 22b. When the actuator is mounted on the frame in the attachment accessory, the head can be held at least partially without play in the accessory.

According to a first embodiment, in the absence of a load, such as for example during installation of the actuator in the winding tube, the first deformable part is in contact, direct or indirect, with the accessory of fixation. The first contact element is not in contact with the accessory. Thus, the first branch is held without play in the accessory, while the second branch is without contact with the accessory. When a torque is applied to the actuator, for example a torsion force in a first direction due to the weight of the deck blades not wound on one side of the tube, the actuator as a whole is subjected to this torque. The first deformable part is then constrained against the accessory and deforms, while the first contact element comes into contact with the accessory. Once the first contact element is in contact with the accessory, the rotational movement undergone by the actuator is stopped. The first contact element acts as an abutment limiting the rotational movement of the actuator relative to the accessory. Lightening the windable element, for example echoed because of the windable element encountering an obstacle, causes a relaxation of the compression force of the first deformable part and a new angular position of the actuator.

In other words, in static or dynamic operation of the actuator in the absence of an obstacle, the first branch is deformed so that elastic, while the second branch limits this deformation. This allows both to protect the deformable part and to transmit the torque. When arriving on an obstacle, the deformation of the first branch decreases. The variation of deformation is characteristic of the variation of angular position of the head of the actuator vis-à-vis the accessory.

Advantageously, the head of the actuator comprises a second deformable part 26a, preferably integrated with the first branch. It also comprises a second non-deformable contact element 26b, integrated in the second branch. The second deformable part and the second non-deformable contact element are respectively symmetrical to the first deformable part and the first non-deformable contact element so as to take into account angular variations of the actuator relative to the attachment accessory in both directions of rotation. Alternatively, a single deformable part, disposed on either side of an axis of symmetry of the first branch, constitutes by itself the first and the second deformable part. Likewise, the first and second contact elements can be formed integrally into a single element.

The elastic contact pieces are preferably formed by elastomers integrated in the first branch of the base of the actuator head, for example silicone parts attached to the head. Alternatively, the elastomers are molded or co-injected with the head of the actuator.

One or more of the branches may be provided with deformable parts. The contact elements can be provided on branches not equipped with deformable parts. In the first embodiment, the contact elements are constituted by the surfaces of the branches of the head not equipped with deformable parts. These various elements are shown schematically in Figures 3 and 4, showing a portion of the base. In a second embodiment, the contact elements are provided on the same branches as those integrating the deformable parts.

The deformable parts in the form of elastomers can be protected by a cover 27 of protection. This is in the form of another deformable part or mounted with freedom of movement relative to the base. The cover can thus comprise two elements sliding one vis-à-vis the other and relative to the base, the deformable part being held between these sliding elements. These elements can then correspond to the first and second contact element. This cover protects the elastomers against cuts, scratches that could damage their structure. It can also provide the function of mechanical stop against excessive crushing of the elastomers, such as a contact element. Preferably, the deformable parts are overmolded on the base, at the level of recesses 28 provided for this purpose on at least one branch of the base, in particular on either side of the branch. During overmoulding, a space or expansion zone of the elastomer 29 must be provided. The deformable parts penetrate and are held in the recesses. The contact elements limit the compression of the deformable parts below their maximum compression capacity.

Advantageously, the number and shape of the deformable parts are provided so that the actuator is mounted without mechanical play in the accessory, at least at the branches equipped with deformable parts. The actuator, at least at its near end of the head, is thus devoid of moving mechanical parts relative to each other: the actuator is said to be rigid (as opposed to the actuators of the prior art which provide a mechanical play between parts constituting the actuator , such as the head and the tube). Thanks to the deformation of the deformable part (s) and the remote measurement at the printed circuit, a fine obstacle detection or intrusion attempt is possible, including with a rigid actuator.

Advantageously, the shape of the branches is substantially equivalent to that of the branches of actuators already marketed. Thus, the accessories used may be common and the replacement of an actuator already installed and not equipped with the detection device according to the invention may easily be replaced by an actuator according to the invention. The main difference in terms of external appearance is to provide branches not equipped with deformable parts, a section SA1 is smaller than the corresponding section of the accessory, so as to allow a movement of the actuator vis-à-vis of the accessory in some cases of load. Alternatively, all the branches of the head are equipped with contact elements and they have an external appearance (shape and dimensions) equivalent to that of the accessory. The contact elements are then provided at these same branches, that is to say that they allow compression of the deformable parts but in a limited manner, that is to say that this compression is stopped as soon as the contact element is in contact with the direct contact accessory or via another part, for example via the protective cover).

No predefined mounting direction is required, since the angular position detection module is mounted on the printed circuit board. This is held fixedly relative to the tube or the actuator head. Regardless of the mounting angle of the actuator in the accessory, the detection module detects a reference angle, which corresponds, for example, to the initial angular position, before starting. This reference angle value can be determined at the beginning of each maneuver. There is therefore no constraint positioning the actuator in the accessory vis-à-vis a particular orientation. This is particularly suitable for integration in a so-called multi-position head, that is to say that can be mounted indifferently in several angular positions vis-à-vis the accessory. The measured angle variations are therefore variations with respect to the reference angle. In particular, irrespective of the orientation of the branches equipped with deformable parts with respect to gravity, the fact that part of the blades of the windable element remains hanging on one side of the winding tube (including in the case of a winding element almost completely wound) creates an unbalance effect on one side, which can be detected by the angular position detection module. Therefore, it is possible to detect a final blade frozen by the gel or other phenomenon when the windable element is in the high position. If the actuator is disassembled and reassembled in another angular orientation, the reference angle will be changed accordingly in a transparent manner for the installer or the user. This embodiment requires no contact or particular relative positioning between the test body (the deformable part or pieces) and the sensor (the angular position detection module). The rotational movement resulting from the application of a torque on the actuator, in particular the angular position (relative to the reference angular position), is measured by the angular position detection module 50. The information is processed by the engine control means. In particular, the measured angular variations are filtered and an inclination curve can be deduced. The curves shown in FIG. 5 show, on the one hand, a signal as measured and a filtered signal. (The elimination of high frequencies is possible because the angular variations are slow with respect to these high frequencies). Filtering can be done by integration. The filtering means may be software or hardware.

During the movement of the actuator, vibrations can be recorded, related to the mechanical stresses on the structure, for example in contact with the blades of a rollable element in the slideway. These movements can be measured by the angular position detection module, but are not taken into account in the context of obstacle detection.

An angular variation greater than an absolute value at a first threshold may be defined as resulting from an obstacle. The actuator motor is then stopped or activated in the opposite direction of rotation to clear the obstacle. In particular, this angular variation is a negative variation (the obstacle creating a reduction in the load borne by the actuator and therefore a relaxation of the compressive force on the deformable part). Alternatively, an angle measurement lower than the reference angle (angular position measured at startup) is an obstacle or intrusion indicator.

The sensitivity threshold may be variable, for example depending on the position, the direction of movement, or other parameters, so that an obstacle is detected for example from the stack of 3 or 4 blades. outside the end position, while avoiding a hard point in the slide causes the systematic rise of the rollable element. The same deformable part is adapted to a range of sensitivities. Moreover, because of the use of the contact elements forming rigid abutments, the same deformable part can be used on several types of actuators providing very different necks (for example from 6 to 40 Nm).

The curve of FIG. 6 schematically explains the taking into account of the measured data (raw signal) and filtered (filtered signal), except for the presence of stops (contact elements). The first zone ZA corresponds to the reference zone, for example a zone of angular position of the reference actuator, with constant charge substantially zero. The second zone ZB shows a gradual evolution of the measurement. This corresponds to a gradual increase in the load, for example when the rolling element goes down and its weight, supported by the head of the actuator, increases. Zone ZC shows a zone of release of the load, with a sudden angular variation. This corresponds for example to the appearance of an obstacle on the run of the windable element or an end stop. The third zone is followed by a fourth zone ZD returning to a constant angular position, for example the reference angular position but may also be an angular position different from this reference position. The processing of this information can therefore allow the detection of an unexpected phenomenon, for example the presence of an obstacle on the stroke, and cause the stop or the change of direction of rotation of the actuator.

The curve of FIG. 7 is substantially equivalent, with the difference that the contact elements act as stops which limit the compression of the elastomer to a certain load value. In this case, zone ZB1 shows a gradual change in the measurement of the angular position of the actuator from a reference position in which the load is substantially zero (zone ZA). Zone ZB2 shows a ceiling area, during which the load can increase, but without affecting the compression of the room deformable. The zone ZC1 reflects a slackening of the load, with a sudden angular variation, which can lead to a reversal of angular position with respect to the reference position (zone ZC2). Zone ZD shows a return to a constant angular position, for example the reference angular position but can also be an angular position different from this reference position.

The deformable part, for example of the elastomer type, operates in compression, this allowing the actuator to have a dampened movement in the accessory. Only one type of deformable part can be adapted for a range of actuators capable of producing different torques of rotation, that is, the deformable part is independent of the working torque of the actuator. In the absence of stops, the angular variation with respect to the reference angle will be different according to the working torque of the actuator. In the presence of stops, the speed of angular variation will be different according to the working torque of the actuator (at equal output speeds). These features can be used to automatically detect the sensitivity to be set as the threshold value. In fact, the variations measured in quasi-permanence make it possible to deduce the type, size or weight characteristics of the driven windable element, and to adapt the obstacle detection sensitivity accordingly. Alternatively, a mechanical elastic part, for example a spring blade or a coil spring could be used as a deformable part. Their life is superior but they do not offer the benefits of damping elastomers. A combination of these elements could be considered. An example of such an embodiment is described below with reference to FIG. 8. In this figure, a head comprises a branch 22c provided with a groove 221, in particular a longitudinal groove, in which is housed a deformable part 222 constituted by a leaf spring 222 having a profile or section W. The central tip of the W-shaped profile, joined by the two central flanges 224 of the blade, is housed by deformation elastic in the groove. Consequently, the two outer wings 223 of the W profile extend along the flanks of the branch 22c. Thus, when the actuator is subjected to a torque, a surface of the accessory is pressed on one of the outer wings of the leaf spring and deform. It follows a rotational movement of the head, so the actuator, relative to the accessory or the frame. When the torque on the actuator is zero, the head is once again occupy its rest position relative to the accessory or to the frame, under the action of the leaf spring. Alternatively, the spring can be made in two independent parts, each part constituting an elastic piece at a side of the branch.

The same device can allow the detection of an intrusion attempt on a rollable element. The lifting of the rollable element, while the actuator is stopped, is reflected in a variation of rotation angle of the actuator vis-à-vis the attachment accessory, in the absence of command command issued to the actuator. This angular variation detected is used to implement an alarm device coupled to the actuator or to any other action to alert or prevent the intrusion.

In a variant of the actuator, the deformable part is attached not to the head of the actuator but to an accessory, for example an accessory for fixing the actuator. Such an actuator comprises the accessory. The invention therefore also relates to an accessory for attaching an electromechanical actuator for operating a windable element to a frame, comprising:

at least a first deformable part under the action of a torque to which the actuator is subjected,

the first deformable part being integrated at a first torque recovery branch.

Claims

claims

Electromechanical actuator head (2) (1) for operating a windable element (10), comprising:

a mechanical connecting element (20, 24) to a body (3) of the actuator without play in rotation,

at least two torque recovery branches (22, 22a, 22b, 22c) adapted to cooperate with an attachment (8) for attachment to a frame (9),

at least a first deformable part (25a, 26a, 222) under the action of a torque to which the actuator is subjected, characterized in that the first deformable part is integrated at a first branch (22a, 22c) couple recovery.

Accessory for attaching an electromechanical actuator for operating a windable element to a frame, comprising:

characterized in that the first deformable part is integrated at a first torque recovery branch.

Head or accessory according to one of the preceding claims, characterized in that the first deformable member penetrates, in particular is fixed in a recess (28) provided at the first branch. 4. Head or accessory according to one of the preceding claims, characterized in that the deformable part is an elastomer, stressed in compression during the application of the torque to which the actuator is subjected.

Head or accessory according to the preceding claim, characterized in that the first branch comprises an expansion zone (29) intended to facilitate the deformation of the elastomer during its compression.

Head or accessory according to one of the preceding claims, characterized in that the head or the accessory comprises a first non-deformable contact element (25b) under the action of the couple, the first contact element being distinct from the first component deformable.

Head or accessory according to the preceding claim, characterized in that the contact element is integrated with a second outer branch of the head or the accessory.

Head or accessory according to one of the preceding claims, characterized in that the head or the accessory comprises a second deformable part and a second non-deformable contact element.

Electromechanical actuator for operating a windable element (10) around a winding tube (5), the actuator comprising:

a tubular body (3),

a head (2) according to one of the preceding claims, the head being mechanically linked without play to the tubular body and comprising at least two branches (22, 22a, 22b, 22c) of resumption of torque adapted to cooperate with an accessory (8) for attachment to a frame,

an engine (99), and

a control unit (40).

10. Actuator according to the preceding claim, characterized in that the control unit comprises a module (50) for detecting angular position, adapted to determine the angular position of the actuator from the measurements provided by an angular position sensor. .

1 1. Actuator according to the preceding claim, characterized in that the angular position sensor is remote and without contact with the elastic contact piece.

12. Actuator according to one of claims 10 to 1 1, characterized in that the angular position sensor is implanted out of the head.

13. Actuator according to one of claims 9 to 12, characterized in that the control unit comprises an element for automatically determining an angular position threshold from which the motor must be deactivated.

14. Installation (100) for maneuvering an element (10) winding concealment, closure, sunscreen or screen comprising:

- At least one accessory (8), in particular a fixing accessory according to one of claims 2 to 8, adapted to be mounted on a fixed support (9), and / or - An actuator (1) according to one of claims 9 to 13, the actuator being mounted with the possibility of angular movement in the fixed support.

Installation according to claim 14, characterized in that at least one branch (22, 22a, 22b) of the actuator head is mounted without play in a part of the accessory.

Installation according to claim 14 or claim 15, characterized in that the accessory and the actuator cooperate only mechanically, without requiring a module for detecting their relative angular position.

Installation according to one of claims 14 to 16, characterized in that the actuator and / or the accessory comprise mounting means (22, 22a, 22b) such that the actuator can be mounted in a plurality of angular positions vis-à-vis the fixed support, in particular in more than two angular positions.