EP4644658A1

EP4644658A1 - Method for operating a roller shutter assembly with tiltable slats

Info

Publication number: EP4644658A1
Application number: EP25165174.1A
Authority: EP
Inventors: Renato DE PAZZI; Damiano Guzzo
Original assignee: Master SpA
Current assignee: Master SpA
Priority date: 2024-04-29
Filing date: 2025-03-20
Publication date: 2025-11-05

Abstract

The present invention relates to a method for operating a roller shutter assembly (10) with tiltable slats for a door and/or window, including a roller shutter (12) adapted to be wound around a support roller (14) which can be rotated by means of electromechanical actuation means (16), and a command and control unit (40) configured to command and control the electromechanical actuation means (16). Specifically, the method is implemented by the command and control unit (40) and it comprises the steps for moving the roller shutter (12) towards the extended end position wherein the tiltable slats (22t) are moved to an opening position by means of transmission means (28), detecting the reaching of the extended end position, moving the roller shutter (12) by a predetermined distance (D1) from the extended end position towards said retracted end position further moving the tiltable slats (22t) to the closing position by means of said transmission means (28) so as to obtain the maximum degree of light-darkening through the door and/or window by means of said roller shutter (12), and stop the movement of the roller shutter (12) upon reaching the predetermined distance (D1). Furthermore, the present invention relates to a computer program and a command and control unit (40) for the roller shutter assembly (10) which are adapted to implement said method.

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a motor-driven roller shutter assembly with tiltable slats. In particular, the present invention relates to an improved method for operating a motor-driven roller shutter assembly with tiltable slats, a computer program and a command and control unit for applications in the window and door industry for civil and/or industrial construction use.

STATE OF THE PRIOR ART

Motor-driven roller shutters provided with tiltable slats are known in the state of the art.
Similarly to the conventional motor-driven roller shutters, a motor-driven roller shutter with tiltable slats is configured to be wound around a support roller, fitted on a door and/or window to be darkened. The movement of the support roller is actuated by an electric motor, for example of the tubular type. In particular, a motor-driven roller shutter with tiltable slats is configured to be moved between an extended end-stroke position for the maximum obstruction of the opening of the door and/or window, and a wound end-stroke position for the minimum obstruction of the opening of the door and/or window. Therefore, a motor-driven roller shutter with tiltable slats provides for movement commands by means of a "raising/lowering mode" corresponding to the operation for raising or lowering the roller shutter on a main plane, such as for example a substantially vertical plane.
Furthermore, unlike conventional motor-driven roller shutters whose slats remain substantially parallel to the main plane, when it is in the extended end-stroke position a roller shutter with tiltable slats provides for the option of tilting, that is directing, the slats transversely with respect to the main plane so as to allow a desired amount of light to pass through the roller shutter (opening position of the slats), or the possibility of returning the slats parallel to the main plane so as to obtain maximum obstruction of the opening of the door and/or window (extended end-stroke position) and darkening by means of the roller shutter (closing position of the slats). Therefore, a motor-driven roller shutter with tiltable slats provides for further movement commands by means of an "tilting mode" corresponding to a tilting or non-tilting of the slats with respect to the main movement plane of the roller shutter, when the latter is in the extended end-stroke position.
With reference to Figs. 1, 2 and 3, a prior art motor-driven roller shutter RS with tiltable slats is connected to a support roller RO by means of connection strips CB. Furthermore, the motor-driven roller shutter RS is configured to be wound around a support roller RO which, in turn, can be rotated by means of an electric motor MO. In particular, said electric motor MO is adapted to actuate a rotation of the support roller RO around its axis so as to move the roller shutter RS between the wound end-stroke position (see Fig. 1) and the extended end-stroke position (see Fig. 2) in which it is substantially completely unrolled from the support roller RO and abutting substantially fully lying on an abutment base AB, such as threshold, window sill or frame of the door and/or window.
The motor-driven roller shutter RS further comprises a plurality of tiltable slats TS each of which can be tilted by rotating around a respective rotation axis. To this end, the tiltable slats TS are connected to each other and with the support roller RO using transmission means TD. In particular, when the motor-driven roller shutter RS reaches the extended end-stroke position (see Fig. 2), said transmission means TD are configured so as to cause a simultaneous tilting, that is orientation, of the plurality of tiltable slats TS by means of a further rotation of the support roller RO, so as to obtain the opening position of the slats.
With such prior art motor-driven roller shutter RS, in order to obtain the maximum degree or condition of light-darkening of the door and/or window by means of the roller shutter, that is to obtain the minimum degree of light transmittance, the latter must be maintained in the extended end-stroke position and, at the same time, tilt the tiltable slats TS substantially parallel to the main plane, obtaining a closing position of the slats, so as to allow minimum or no light to pass through the roller shutter RS.
In order to obtain such maximum degree of darkening of light through the door and/or window by means of the roller shutter RS, the support roller RO is actuated so as move the roller shutter RS from the wound end-stroke position (Fig. 1) towards the extended end-stroke position stopping the movement at the exact time when the roller shutter RS contacts the abutment base AB. In other words, the roller shutter RS is actuated in "raising/lowering mode" driving in rotation the support roller RO to cause the lowering of the roller shutter RS until the exact time when it contacts the abutment base AB, however preventing the tiltable slats TS from moving from the closing position to the opening position.
Alternatively, when the roller shutter RS is in the extended end-stroke position (Fig. 2), in order to obtain such maximum degree of darkening of light through the door and/or window by means of the roller shutter RS, the support roller RO is actuated so as to move the tiltable slats TS to the closing position by means of transmission means TD (as shown in Fig. 3). In other words, the roller shutter RS is actuated in "tilting mode" driving in rotation the support roller RO so as to cause by means of transmission means TD a movement of the slats TD from the opening position to the closing position.
Although it works appropriately in most cases, this prior art motor-driven roller shutter RS reveal some drawbacks.
As a matter of fact, when the roller shutter RS is in the extended end-stroke position, it is difficult to reliably move the tiltable slats TS from the opening position to a repeatable and precise closing position, to obtain the maximum degree of darkening of light by means of the roller shutter RS. As a matter of fact, when the tiltable slats TS do not perfectly reach the closing position, the roller shutter RS allows the through-passing of a significant amount of light, for example between tiltable slats TS that are adjacent and not properly tightened to each other.
In particular, depending on the operating characteristics of the motor MO and/or depending on the mechanism used to form the transmission means TD adapted to drive the tiltable slats TS between said opening and closing positions, it is difficult to suitably actuate the support roller RO so as to tighten the tiltable slats TS to each other with appropriate force so as to obtain the maximum degree of darkening of light. As a matter of fact, a minimum tolerance or minimum clearance of the elements that form the transmission means TD and/or a minimum rotation tolerance of the support roller RO, reduce the probability of precisely and reliably obtaining a position for closing the tiltable slats TS, wherein the latter are tightened to each other with appropriate force to obtain the highest degree of light-darkening.
Furthermore, the tiltable slats TS and/or the mechanism used for forming the transmission means TD may provide for a change in size over time depending on the materials with which they are formed and/or the environmental conditions such as for example a thermal dilatation or contraction induced by changes in environmental temperature, for example different seasons. Said change in size further reduces the probability of precisely and reliably obtaining a position for closing the tiltable slats TS.
Possibly, in order to overcome these drawbacks, by means of a control device possibly from a remote position, the user can operate manually with the "tilting mode" for the fine correction of the inclination of the tiltable slats TS by actuating the motor MO and the support roller RO so as to obtain the desired greater degree of light-darkening. However, in this condition, the use of the roller shutter RS is difficult and complex. In addition, there cannot be obtained a reliable centralised management of a plurality of roller shutters, for example using a single control system (that is by means of a "home automation management system").
On the other hand, when the roller shutter RS is moved from the wound end-stroke position towards the extended end-stroke position, it is difficult to obtain a reliable interruption of the moved at the exact time when the roller shutter RS comes into contact with the abutment base AB, while simultaneously preventing the tiltable slats TS from moving from the closing position to the opening position.
Therefore, even in this condition, the roller shutter RS is difficult and complex to use, and there cannot be obtained a reliable centralised management of a plurality of roller shutters, for example through a single control system.
Possibly, in order to overcome this drawback, there can also be provided for one or more sensors arranged at the guides GM on which the roller shutter RS slides, and which are configured to detect the exact time when the roller shutter RC comes into contact with the abutment base AB. However, in this condition, there arises the need to provide for components that are expensive and/or unreliable whose installation and communication with a control unit is difficult to obtain.
As a result, there arises the need to develop a method for operating a motor-driven roller shutter assembly with tiltable slats, a computer program adapted to implement said method and a command and control unit, which are improved and alternative with respect to prior art solutions, and/or which overcome at least one of the above-mentioned drawbacks.

SUMMARY OF THE INVENTION

An object of the present invention is to provide an improvement to a method for the automatic operation of a motor-driven roller shutter assembly with tiltable slats, that is adapted to provide a maximum or greater degree of light-darkening through the door and/or window using the roller shutter.
In the context of the task outlined above, an object of the present invention is to provide a method for operating a motor-driven roller shutter assembly with tiltable slats, that is adapted to guarantee in a more reliable manner a maximum or greater degree of light-darkening.
A further object is to obtain a method for operating a motor-driven roller shutter assembly with tiltable slats, that is adapted to guarantee in a more reliable manner a movement of the slats in the closing position to obtain a maximum or greater degree of light-darkening.
A further object is to obtain a method for operating a motor-driven roller shutter assembly with tiltable slats, that can be easily implemented in roller shutter assemblies of various types and/or construction. In particular, the method must be easy to implement in roller shutter assemblies having various types of motors adapted to move the support roller and/or various types of constructions for transmission means adapted to move the slats in the opening and closing positions.
A further object is to obtain a method for operating a motor-driven roller shutter assembly with tiltable slats, that can be easily implemented using cost-effective components.
A further object is to obtain a method for operating a motor-driven roller shutter assembly with tiltable slats, that can be easily implemented using electric motors having mechanical limit switches.
A further object is to obtain a method for operating a motor-driven roller shutter assembly with tiltable slats, that can be easily adjusted depending on the characteristics of the roller shutter and/or depending on the characteristics of the door or window in which the roller shutter is installed.
A further object is to obtain a method for operating a motor-driven roller shutter assembly with tiltable slats, that can be easily implemented for driving a plurality of motor-driven roller shutters by means of a centralised control system.
A further object is to obtain a method for operating a motor-driven roller shutter assembly with tiltable slats, that offers an alternative with respect to the prior art solutions.
A further object is to obtain a method for operating a motor-driven roller shutter assembly with tiltable slats, which offers ease of installation by an installation technician.
A further object is to obtain a method for operating a motor-driven roller shutter assembly with tiltable slats, which offers ease of use by a user.
A further object is to obtain a computer program adapted to implement said method for operating a motor-driven roller shutter assembly with tiltable slats.
A further object is to obtain a command and control unit adapted to implement said method for operating a motor-driven roller shutter assembly with tiltable slats.
The aforementioned tasks and others which will be more apparent hereinafter in the description, are achieved through a method for actuating a motor-driven roller shutter assembly with tiltable slats, a computer program and a command and control unit, as defined in the independent claims. Preferred embodiments are defined in the dependent claims.

BRIEF DESCRIPTION OF THE FIGURES

The further characteristics and advantages of the method for operating a motor-driven roller shutter assembly with tiltable slats, of the computer program and of the command and control unit, according to the present invention, will become more apparent in the following description provided purely by way of non-limiting example, with reference to the figures below, wherein:

Fig. 1 is a schematic representation of an example of a roller shutter with tiltable slats, according to the prior art, in a wound end-stroke position;
Fig. 2 is a schematic representation of the example of the roller shutter with tiltable slats of Fig. 1, in an extended end-stroke position wherein the tiltable slats are in an opening position;
Fig. 3 is a schematic representation of the example of the roller shutter with tiltable slats of Fig. 1, in an extended end-stroke position wherein the tiltable slats are in a closing position;
Fig. 4 is a schematic representation of a roller shutter assembly with tiltable slats which can be installed in a door and/or window, according to a preferred embodiment of the present invention, in a wound end-stroke position;
Fig. 5 is a schematic representation of the roller shutter assembly with tiltable slats of Fig. 4, in an intermediate position between the wound end-stroke position and an extended end-stroke position;
Fig. 6 is a schematic representation of the roller shutter assembly with tiltable slats of Fig. 4, in an extended end-stroke position wherein the tiltable slats are in an opening position;
Fig. 7 shows a detail of a possible embodiment of transmission means of a roller shutter of the roller shutter assembly Fig. 4, wherein the tiltable slats are in a closing position;
Fig. 8 shows the detail of the possible embodiment of the transmission means of Fig. 7, wherein the tiltable slats are in an opening position;
Fig. 9 shows a cross-sectional detail of a possible embodiment of a distal end slat of the roller shutter assembly of Fig. 4, wherein a movable extension element is in a position of maximum protrusion from the distal end slat;
Fig. 10 shows the cross-sectional detail of the possible embodiment of the distal end slat of Fig. 9, wherein the movable extension element is in a position of maximum insertion into the distal end slat when the roller shutter assembly is in the extended end-stroke position;
Fig. 11 is a schematic representation of the roller shutter assembly with tiltable slats of Fig. 4, in a position of maximum degree of light-darkening through the door and/or window by means of the roller shutter, and wherein the tiltable slats are in a closing position;
Fig. 12 shows waveforms of signals transmitted by an electric motor of electromechanical actuation means of the roller shutter assembly with tiltable slats of Fig. 4, when a roller shutter moves with a substantially constant speed;
Fig. 13 shows waveforms of the signals of Fig. 12, when a mechanical limit switch of the electric motor intervenes interrupting one of the signals.

DETAILED DESCRIPTION OF THE INVENTION

In the description below, expressions such as "upper", "lower", "horizontal", "vertical" and the like, refer to a motor-driven roller shutter assembly with tiltable slats, and its components, in the standard use configuration according to the present invention, as shown in the attached figures.
An aspect of the present invention relates to a method for operating a motor-driven roller shutter assembly 10 with tiltable slats for doors and/or windows. In particular, with reference to Figs. 4 to 13, herein described is the motor-driven roller shutter assembly 10 with tiltable slats for doors and/or windows, and the method for operating the latter, according to a preferred embodiment of the present invention.
The motor-driven roller shutter assembly 10 with tiltable slats may provide for various constructions, and in the present description there is described a possible preferred embodiment. However, such preferred embodiment shall be deemed provided solely by way of non-limiting example, given that operation method according to the present invention may be implemented in various types of motor-driven roller shutter assemblies with tiltable slats.
The roller shutter assembly 10 comprises a roller shutter 12 which is configured to be wound around a support roller 14 which, in turn, can be actuated by rotation about its axis through electromechanical actuation means 16. Furthermore, the roller shutter assembly 10 comprises a command and control unit 40, better explained below, which is operatively connected to said electromechanical actuation means 16.
The electromechanical actuation means 16 comprise an electric motor which can be powered using mains voltage. Said electric motor comprises at least one first winding and one second winding (the windings are not shown and they are not numbered in the figures), and it is operatively associated with a support roller 14 for imparting to the latter alternatively in rotation one of the rotation directions, therefore allowing the movement of the roller shutter 12.
Said electric motor of the electromechanical actuation means 16 is preferably of the tubular type, and it is inserted into the support roller 14 and coaxial to the latter. However, this configuration shall not be deemed as limiting, and there may be provided for further configurations in which, for example, the electric motor is arranged outside the support roller 14, and it is adapted to impart a rotation thereof about its axis using belts or gears.
The support roller 14 and the electromechanical actuation means 16 are typically installed in a position above a door and/or window opening or compartment in which the roller shutter assembly 10 is installed.
The roller shutter 12 is configured to be wound around the support roller 14, or unrolled from the latter, by actuating the electromechanical actuation means 16 to respectively impart a winding or unrolling rotation, so that it can be moved between a wound end-stroke position or retracted end-stroke position (see Fig. 4), and an extended end-stroke position (see Fig. 6), passing through intermediate positions between these end-stroke positions (see Fig. 5 where an example of an intermediate position is shown). The movement of the roller shutter 12 between the wound and extended end-stroke positions is carried out on a main shielding plane SP, which is substantially vertical in the present embodiment.
In the wound end-stroke position, the roller shutter 12 is substantially fully or predominantly wound around the support roller 14, substantially obtaining a minimum obstruction of the opening of the door and/or window.
In the extended end-stroke position, the roller shutter 12 is substantially fully unrolled from the support roller 14 and abutting substantially fully lying on an abutment base 18, such as a threshold, window sill or door frame and/or window in which the roller shutter assembly 10 is installed, substantially obtaining a maximum obstruction of the opening of the door and/or window.
In the intermediate positions between the end-stroke positions, the roller shutter 12 is substantially partially unrolled from the support roller 14 and not abutting against the abutment base 18, resulting in degrees of obstruction of the opening of the door and/or window that are intermediate between those obtained at the two end-stroke positions, depending on the degree of unrolling of the roller shutter 12.
To this end, the roller shutter 12 is connected to the support roller 14 using connection means 20 preferably flexible, such as for example one or more buckles (connection means 20 are better shown in Figs. 6 and 11). The connection means 20 comprise at least one end connected to the side walls of the support roller 14, and at least one second end connected to a non-tiltable slat of the proximal end of the roller shutter 12. In this condition, the actuation of the electromechanical actuation means 16 causes the support roller 14 to rotate about its axis, and a resulting winding/unrolling of the connection means 20 and of the roller shutter 12 connected thereto.
Referring in particular with reference to Figs. 4 to 6, the roller shutter 12 comprises a plurality of slats 22, or group of slats 22. Each slat of the group of slats 22 extends longitudinally between two head edges, and it provides for a first lateral edge and a second lateral edge that are parallel to the longitudinal direction of the slat. Said edges, head and lateral, are also connected to each other by a pair of main faces, that is larger, of each slat, which are substantially rectangular and parallel to each other.
Typically, each slat of group of slats 22 is preferably formed by an extruded section, for example made of aluminium, and it has a cross-section preferably curved to facilitate the winding of the roller 12 around the support roller 14, reducing its overall dimensions in the fully wound configuration.
In particular, the slats of the group of slats 22 are also hinged to each other two by two so as to form a shield wherein, when the roller shutter 12 is in the extended end-stroke position, the main faces of the plurality of slats define a shielding surface that is substantially parallel to the main shielding plane SP. Said screen is in turn configured to be wound around the roller 14, as mentioned above, and it is also adapted to slide substantially parallel to the main shielding plane SP in lateral guide means 24, such as for example a pair of cross-sectional C-shaped profiles. The lateral guide means 24 may be comprised in the roller shutter assembly 10. Alternatively, the lateral guide means 24 may be pre-existing or may be provided on a frame of the door and/or window in which the roller shutter assembly 10 is installed.
Furthermore, the roller shutter assembly 10 preferably comprises lateral support means 26 adapted to support and hinge to each other adjacent slats of the group of slats 22 of the shutter 12 (the lateral support means 26 are better shown in Figs. 7 to 10). The lateral support means 26 are substantially arranged at each head end of each slat of the group of slats 22. The lateral support means 26 are configured to support the roller shutter 12 in an assembled configuration and which can be wound around the roller 14, and to guide the sliding of the roller shutter 12 in the lateral guide means 24.
The group of slats 22 of the roller shutter 12 comprises at least two non-tiltable slats, such as at least one proximal end slat 22p and at least one distal end slat 22d, and a plurality of tiltable slats 22t. The tiltable slats 22t are preferably arranged between said non-tiltable slats of the proximal end 22p end and of the distal end 22d.
The non-tiltable slats, of the proximal end 22p and of the distal end 22d, are slats arranged at opposite end portions of the roller shutter 12, when the latter is in the extended end-stroke position, along a direction which goes from the support roller 14 to the abutment base 18. In particular, the non-tiltable slat of the proximal end 22p (hereinafter also referred to as "proximal end slat 22p") is connected to the support roller 14 through said connection means 20. While, the distal end non-tiltable slat 22d (hereinafter also referred to as "distal end slat 22d") is adapted to abut against the abutment base 18. In the present preferred embodiment, the non-tiltable slats comprise two proximal end slats 22p, and a single distal end slat 22d; however, this selection shall not be deemed as limiting.
Furthermore, the non-tiltable slats, of the proximal end 22p and of the distal end 22d, are substantially non-rotatable by operatively maintaining the respective main faces substantially parallel to the main shielding plane SP, when the roller shutter 12 is in the extended end-stroke position. While, the tiltable slats 22t are configured to rotate, when the roller shutter 12 is in the extended end-stroke position, about an axis parallel to the respective longitudinal direction between a closing position and an opening position. The rotation of the tiltable slats 22t can be obtained by means of a connection of the type rotatable between the head ends of each tiltable slat 22t and the respective lateral support means 26.
In the closing position, each tiltable slat 22t is arranged substantially parallel to said main shielding plane SP. While, in the opening position, each tiltable slat 22t is arranged substantially transversal to said main shielding plane SP, forming with the latter a substantially non-zero angle, such as for example an angle of 90 degrees, or an angle comprised between 45 and 90 degrees, or an angle comprised between 90 and 135 degrees, and possibly selectable between one or more of such angular ranges.
To this end, there may be provided for different constructions for the roller shutter assembly 10 and for the roller shutter 12, which are adapted to obtain a tilting, that is orientation, of the tiltable slats 22t with respect to the main shielding plane SP when the roller shutter 12 is in the extended end-stroke position.
For example, the roller shutter 12 of roller shutter assembly 10 may comprise transmission means 28, which in turn may for example include a flexible metal wire and/or a flexible metal band. Said transmission means 28 are connected with a first end to the support roller 14, and furthermore they are rotatably coupled preferably along their longitudinal extension with a portion of each tiltable slat 22t.
In particular, the transmission means 28 are configured so that, when the roller shutter 12 is in the wound end-stroke position, the traction induced by the previous winding rotation of the support roller 14 through the transmission means 28 is adapted to keep the tiltable slats 22t in the closing position (see Fig. 4).
Furthermore, the transmission means 28 are configured so that, when the roller shutter 12 is moved from the wound end-stroke position towards the extended end-stroke position and it is in an intermediate position between them, the unrolling rotation of the support roller 14 does not apply through the transmission means 28 a force adapted to move the tiltable slats 22t, therefore keeping them in the closed position (see Fig. 5).
Lastly, the transmission means 28 are configured so that, when the roller shutter 12 reaches the extended end-stroke position in which the roller shutter 12 is substantially fully unrolled from the support roller 14 and abutting substantially fully lying abutment base 18, an further amount of unrolling rotation of the support roller 14 imparts through the transmission means 28 a force adapted of simultaneously moving the tiltable slats 22t from the closing position to the opening position (see Fig. 6), therefore varying the tilting thereof.
From this condition, in order to move the tiltable slats 22t to the closing position while keeping the roller shutter 12 in the extended end-stroke position, the rotation roller 14 is rotated in the reverse direction with respect to the unrolling one in order to apply through the transmission means 28 a traction adapted to move the tiltable slats 22t in said closing position.
As previously mentioned, there may be provided for different constructions for the roller shutter assembly 10 and for the roller shutter 12, which are adapted to obtain an tilting of the tiltable slats 22t with respect to the main shielding plane SP when the roller shutter 12 is in the extended end-stroke position.
For example, Figs. 7 and 8 together with Figs. 4 to 6, there is shown a possible embodiment, provided by way of non-limiting example, in which the transmission means 28 comprise a flexible metal band 28b and a plurality of rod-like elements 28r. The metal band 28b is connected with a first end to the support roller 14 and is rotatably coupled with a second end to at least one tiltable slat of the plurality of tiltable slats 22t. Furthermore, each rod-like element 28r is rotatably connected through its two ends to respective consecutive pairs of tiltable slats 22t.
This embodiment allows to obtain the closing position of the tiltable slats 22t during the winding of the roller shutter 12 or in the intermediate positions between the wound end-stroke and the extended end-stroke positions (see Fig. 7). While, there can be obtained the opening position of the tiltable slats 22t upon reaching the extended end-stroke position, by applying a further amount of unrolling rotation of the support roller 14 (see Fig. 8), as mentioned above.
With reference to Figs. 9 and 10 together with Figs. 4 to 6, in the preferred embodiment described herein, at a distal end portion of the roller shutter 12, the latter provides for said distal end slat 22d, or distal support element 22d, which is suitably configured to abut against the abutment base 18 and to support the weight of the roller shutter 12 when the latter is in the extended end-stroke position.
To this end, the distal end slat 22d preferably comprises a movable extension element 30, or buffer element 30, which is movable with respect to the distal end slat 22d. The mobile extension element 30 is configured to be contained in the profile of the distal end slat 22d when the roller shutter 12 is in the extended end-stroke position, substantially fully lying on the abutment base 18 (see Fig. 10).
Preferably, the movable extension element 30 has a "double T" cross-section comprising an upper abutment base 30s and a lower abutment base 30i connected by a connection body 30b. The abutment bases, upper 30s and lower 30i, are substantially parallel to each other and operatively arranged horizontally, while the connection body 30b is operatively transversal to the abutment bases and therefore arranged substantially vertically.
In particular, on a lower lateral edge, the distal end slat 22d has a longitudinal opening through which the connection body 30b of the movable extension element 30 is adapted to slide so that the latter is movable between a position of maximum protrusion (see Fig. 9) from the distal end slat 22d, and a position of maximum insertion or maximum contraction (see Fig. 10) into the distal end slat 22d. The height of the connection body 30b, or the distance between the upper 30s and lower 30i abutment bases, determines the maximum amount of protrusion of the movable extension element 30 from the distal end slat 22d. This maximum amount of protrusion of the movable extension element 30, equivalent to the height of the connection body 30b, is preferably between comprised 1 mm and 40 mm, more preferably between 5 mm and 40 mm, even more preferably between 10 mm and 30 mm, or greater than 5 mm.
The weight force of the movable extension element 30 keeps it in a position of maximum protrusion when the roller shutter 12 is in the wound end-stroke position or in intermediate positions between said wound and extended end-stroke positions. While, in the extended end-stroke position in which the roller shutter 12 substantially fully lies on the abutment base 18, the movable extension element 30 abuts against the abutment base 18 through its lower abutment base 30i, and it is in the position of maximum insertion in which its connection body 30b is substantially fully contained within the distal end slat 22d.
Still with reference to Figs. 4 to 11, the command and control unit 40 of the roller shutter assembly 10 comprises command and control means 42, such as one or more microprocessors, one or more microcontrollers and the like or combinations thereof, which are operatively connected to the electromechanical actuation means 16 which in turn comprise the electric motor, as mentioned above. In a possible embodiment, the command and control unit 40 is housed outside a housing casing in which there are housed the electromechanical actuation means 16 and the electric motor. Alternatively, the command and control unit 40 may be housed inside a housing casing in which there are housed the electromechanical actuation means 16 and the electric motor.
In particular, the control and command means 42 of the control and command unit 40 are configured to command and control, for example through a computer program or the like, the modes for operating the electromechanical actuation means 16 so as to cause movements of the roller shutter 12 on said main shielding plane SP, and so as to cause tilting movements of the tiltable slats 22t with respect to said main shielding plane SP.
The movement of the roller shutter 12 on the main shielding plane SP is carried out between the wound end-stroke position and the extended end-stroke position according to the direction of rotation of the electric motor of the electromechanical actuation means 16 by means of command and control means 42, such as respectively the winding or unrolling rotation, which causes the rising and lowering of the roller shutter 12.
The tilting movement of the tiltable slats 22t with respect to the main shielding plane SP between the closing position (tiltable slats 22t parallel to the main shielding plane SP) and the opening position (tiltable slats 22t transversal to the main shielding plane SP) is carried out according to the direction of rotation of the electric motor of the electromechanical actuation media 16 through a command by the command and control means 42, such as respectively a winding or unrolling rotation.
In particular, during the movement of the roller shutter 12 from the wound end-stroke position to the extended end-stroke position, and vice versa, the rotation commanded by the command and control means 42 to the electromechanical actuation means 16 is adapted to keep the tiltable slats 22t in the closing position by the transmission means 28 during winding, and not apply by the transmission means 28 a force adapted to move the tiltable slats 22t from the closing position during the movement towards the extended end-stroke position.
While, when the roller shutter 12 reaches the extended end-stroke position in which it is substantially fully unrolled from the roller shutter 14 and abutting substantially fully lying on the abutment base 18, a further amount of unrolling rotation, commanded by the command and control means 42 to the electromechanical actuation means 16, imparts through the transmission means 28 a force adapted to move the tiltable slats 22t from the closing position to the opening position.
Preferably, the command and control means 42 are connected to the electric motor of the electromechanical actuation means 16 by means of a control assembly 44 comprising a first relay R1 and a second relay R2, each suitable to enable/interrupt the energy supply to, respectively, said first winding and the said second winding of the electric motor of the electromechanical actuation means 16. The relays, first R1 and second R2, can be widely chosen and are generally schematized in the figures with a non-limiting symbol. The windings of the motor are alternately supplied selectively according to the direction of rotation (unrolling rotation or winding rotation) that is intended to be imparted to the support roller 14, in order to obtain a desired movement of the roller shutter 12 and, possibly, of its tiltable slats 22t, as mentioned above.
The actuation of the electric motor of the electromechanical actuation means 16 is determined by an input signal provided to the command and control means 42 through a command and communication interface 46, which is also advantageously comprised in the command and control unit 40. The command and communication interface 46 is adapted to receive signals and/or data and/or instructions via the most commonly used and common communication channels or methods such as radio frequency, Wi-Fi and Bluetooth or with a wired physical control device such as a push-button panel. Input signals for determining the movement of roller shutter 12 and, where possibly of tiltable slats 22t may be provided by a user and/or by light sensors and/or by a home automation management system.
The command and control unit 40 further comprises a power supply unit 48 configured to receive electric power supply from the external, for example through a cable connected to an external power source (not shown) preferably consisting of the power supply mains, and transform the input mains voltage into a voltage adapted to power-supply the command and control unit 40, the command and control means 42, and the electromechanical actuation means 16. Alternatively, power supply unit 48 may receive in input electric power supply from one or more batteries.
Preferably, said command and control unit 40 further comprises detection means 50 associated with the electric motor of the electromechanical actuation means 16, possibly through said control assembly 44. The detection means 50 preferably comprise a circuit adapted to detect, from the start of the electric motor, a first signal S1 related to the current which flows through the first winding of the electric motor and a second signal S2 related to the current which flows through the second winding of the electric motor, and to transmit them to the command and control means 42 (Figs. 12 and 13 show, by way of example, the first signal S1 and the second signal S2).
According to this preferred embodiment, the command and control unit 40 is configured so that, when the roller shutter 12 operates at a substantially constant cruise speed between the end-stroke positions, the first S1 and second S2 signals, relating to the motor windings have patterns similar to each other, but offset by a setting value ΔP0 that depends on the design characteristics of the electric motor itself, as shown in Fig. 12.
In particular, upon receiving through the command and communication interface 46 an input signal to move the roller shutter 12 from the wound end-stroke position to the extended end-stroke position, the command and control means 42 close the relevant relay, first R1 or second R2, of the control assembly 44, therefore actuating the electric motor of the electromechanical actuation means 16 with an unrolling rotation, so as to obtain the lowering of the roller shutter 12. The signals, first S1 and second S2, related to the currents which flow through the two windings, are two offset square waves of this setting value ΔP0, as shown in Fig. 12.
Furthermore, a given change in these signals, first S1 and second S2, is related to the reaching of the extended end-stroke position. This change in such first S1 and second S2 signals may be a change in the shape of one of the signals, and/or a change in absolute value, beyond a predetermined limit value, of the actual phase shift of the signals from that setting value ΔP0.
For example, with reference to Fig. 13, should the electric motor of the electromechanical actuation means 16 comprise a mechanical limit switch for the extended end-stroke position (such as a microswitch associated with the motor), when the extended end-stroke position is reached, said mechanical stop is triggered interrupting one of the two signals (the second signal S2 in Fig. 13), which therefore takes a rectilinear shape different from that of the square wave of the other of the two signals.
Therefore, the detection means 50 detect this change/variation in such first S1 and second S2 signals, and transfer such detection information to the command and control means 42 which, in turn, determine the obtainment of this given change in the first S1 and second S2 signals.
Subsequently, upon determining the obtainment of said given change in signals, the command and control means 42 command an interruption of the power-supply of the electric motor of the electromechanical actuation means 16 by opening the relays of control assembly 44, therefore stopping the unrolling rotation and the movement of the roller shutter 12.
Therefore, according to this preferred embodiment, the command and control means 42 and the detection means 50 operate together, substantially acting as end-stop detection means. The present embodiment which provides for an electric motor provided with one or more mechanical limit switches is particularly preferred as it allows the use of a relatively simple, easily available and cost-effective electric motor. However, there are possible other embodiments in which said wherein said end-position detection means, adapted to detect the extended end-stroke position, may provide for further types of components or embodiments.
Possibly, said signals, first S1 and second S2, may be combined into a combination signal (not shown) to be transmitted to said command and control means 42. In particular, this combination signal is configured so that it is still possible to obtain this change between the signals, first S1 and second S2, for example by analysing the shape and/or its minimum or maximum value, allowing to obtain a determination of the extended end-stroke position.
Hereinafter, still with reference to Figs. 4 to 13, below is the description of the method for operating a motor-driven roller shutter assembly 10 with tiltable slats for doors and/or windows, according to a preferred embodiment of the present invention, in which roller shutter assembly 10 provides for the characteristics and the embodiments described above.
In particular, the method according to the present invention is implemented by the command and control unit 40, and it is adapted to obtain a maximum or greater degree of light-darkening through the door and/or window by means of the roller shutter 12 of the roller shutter assembly 10.
As mentioned above, the roller shutter 12 can be wound around the support roller 14 which can be rotated, in turn, by means of electromechanical actuation means 16. The roller shutter 12 is further provided with the tiltable slats 22t and transmission means 28 connecting said support roller 14 with the tiltable slats 22t to adjust an inclination thereof.
The command and control unit 40 is configured to command and control the electromechanical actuation means 16 so as to cause a movement of the roller shutter 12 on the main shielding plane SP between the wound end-stroke position and an extended end-stroke position, in which said extended end-stroke position is detected by means of end-stroke detection, comprising for example the detection means 50 associated with the command and control means 42, as mentioned above.
Furthermore, the command and control unit 40 is configured to command and control the electromechanical actuation means 16 to cause a tilting movement of the tiltable slats 22t with respect to said main shielding plane SP between the closing position wherein said tiltable slats 22t are substantially parallel to the main shielding plane SP and an opening position wherein the tiltable slats 22t are tilted transversely to the main shielding plane SP. In other words, in the closing position the tiltable slats 22t are arranged so that the respective main faces are substantially parallel to the main shielding plane SP, while in the opening position the tiltable slats 22t are arranged so that the respective main faces are substantially transversal to the main shielding plane SP.
In particular, first and foremost, the method provides for a step in which there is received by the roller shutter assembly 10 a maximum darkening input signal so as to obtain a maximum or greater degree of light-darkening through the door and/or window by means of the roller shutter 12 of the roller shutter assembly 10.
Specifically, at this step the command and control means 42 of the command and control unit 40 receive said maximum darkening input signal through the command and communication interface 46.
Subsequently, the method provides for a step in which the roller shutter 12 is moved toward the extended end-stroke position, substantially by lowering, starting from the wound end-stroke position (see Fig. 4) or from an intermediate position from one of the end-stroke positions (see Fig. 5). Furthermore, upon reaching the extended end-stroke position, the tiltable slats 22t are moved to said opening position by means of transmission means 28.
In particular, during this lowering step, the command and control means 42 of the command and control unit 40 preferably command and control the electric motor of the electromechanical actuation means 16 obtaining an unrolling rotation so as to cause a movement of the roller shutter 12 on the main shielding plane SP toward the extended end-stroke position.
In the present preferred embodiment, as mentioned above, the roller shutter 12 comprises the distal end slat 22d provided with the movable extension element 30 which is movable between the position of maximum protrusion and the position of maximum insertion with respect to the distal end slat 22d. Therefore, in the extended end-stroke position the distal end slat 22d abuts against the abutment base 18 and said movable extension element 30 is in the position of maximum insertion.
Therefore, there is detected the reaching of the extended end-stroke position of the roller shutter 12 by means of end-position detection means, for example comprising the detection means 50 associated with the command and control means 42 according to the embodiment described above and its variants.
In particular, in this step, the command and control means 42 of the command and control unit 40 preferably determine the obtainment of said change in the signals such as for example the interruption of one of said signals, first S1 and second S2, through the detection means 50, therefore stopping the unrolling rotation and the movement of the roller shutter 12.
Subsequently, the method comprises a step in which the roller shutter 12 is moved from the extended end-stroke position toward the wound end-stroke position, substantially by lifting, by a predetermined distance D1 (see Fig. 11 which shows the distance D1). Said predetermined distance D1 is preferably comprised between 1mm and 40mm, more preferably between 5mm and 40mm, even more preferably between 5mm and 30mm, even further more preferably between 5mm e 20mm, or preferably greater than 1mm more preferably greater than 5mm.
In particular, during this raising step, the command and control means 42 of the command and control unit 40 preferably command and control the electric motor of the electromechanical actuation means 16 obtaining a rolling rotation so as to cause a movement of the roller shutter 12 on the main shielding plane SP toward the wound end-stroke position, until there is obtained said predetermined distance D1.
During the movement of said predetermined distance D1, the tiltable slats 22t are further moved from the opening position to the closing position by means of transmission means 28. Specifically, by raising the roller shutter 12 by said predetermined distance D1, there is obtained a maximum or greater degree of light-darkening through the opening of the door and/or window by means of the roller shutter 12.
Preferably, said predetermined distance D1 is substantially less than or equal to the height of the connection body 30b of the movable extension element 30 of the distal end non-tiltable slat 22d of the roller shutter 12. As previously mentioned, said height of the connection body 30b, is preferably between comprised 1 mm and 40 mm, more preferably between 5 mm and 40 mm, even more preferably between 10 mm and 30 mm, or greater than 5 mm.
Therefore, the movement of the roller shutter 12 is stopped upon reaching said predetermined distance D1.
In particular, in this stop step, the command and control means 42 of the command and control unit 40 preferably command an interruption of the power-supply of the electric motor of the electromechanical actuation means 16 by opening the relays of the control assembly 44, therefore stopping the rolling rotation and the movement of the roller shutter 12.
In this condition, during the step for raising by a small amount, such as the predetermined distance D1, the roller shutter 12 continues to remain in abutment, preferably through the movable extension element 30, against the abutment base 18 without fully lying on the latter, thus providing the maximum obstruction of the opening of the door and/or window in which the roller shutter assembly 10 is installed.
Furthermore, in this condition, during the step for raising the roller shutter 12 by a small amount, such as the predetermined distance D1, the tiltable slats 22t are moved from the opening position to the closing position and, at the same time, they are tightened with appropriate force to each other so as to obtain the maximum or greater degree of light-darkening through the opening of the door and/or window by means of said roller shutter 12.
Advantageously, the method for operating the roller shutter assembly 10 ensures the maximum or greater degree of light-darkening through the opening of the door and/or window given that it provides the maximum obstruction of the opening of the door and/or window and, at the same time, appropriate tightening strength for closing the tiltable slats 22t.
Furthermore, in this manner, the method for operating the roller shutter assembly 10 reliably ensures the maximum or greater degree of light-darkening given that the step for raising the roller shutter 12 can be carried out in a reliable manner providing minimal errors for small amounts of movement, such as the predetermined distance D1.
Furthermore, the method for operating the roller shutter assembly 10 can be implemented in roller shutter assemblies 10 of various types and/or construction, depending on the type of electric motor and/or different constructions for the transmission means 28, given that the pre-determined distance D1 can be suitably selected, depending on the characteristics of each roller shutter assembly 10 and its components.
Preferably, the method provides for that said predetermined distance D1 is obtained by moving the roller shutter 12 from the extended end-stroke position towards the wound end-stroke position for a predetermined time interval T1.
In particular, during this step, the command and control means 42 of the command and control unit 40 preferably command and control the electric motor of the electromechanical actuation means 16 obtaining a rolling rotation for a predetermined time interval T1 so as to cause a movement of the roller shutter 12 on the main shielding plane SP toward the wound end-stroke position, until there is obtained said predetermined distance D1.
Preferably, said predetermined time interval T1 is comprised between 0.1 and 6 seconds, more preferably between 0.2 and 5 seconds, even more preferably between 0.5 and 3 seconds.
Advantageously, the method for operating the roller shutter assembly 10 is easy to implement in systems which comprise command and control means 42 and/or electric motors that are readily available, and possibly cost-effective. As a matter of fact, it is easy to program the command and control means 42 by entering time parameters in an internal timer and, at the same time, obtain a reliable operation of electric motors regardless of the characteristics of the latter, for example depending on the rotation speed of the latter.
Furthermore, in this manner, the method for operating the roller shutter assembly 10 reliably ensures the maximum or greater degree of light-darkening given that the step for raising the roller shutter 12 can be carried out in a reliable manner providing minimal errors for small time intervals, such as the predetermined time interval T1.
In a possible embodiment, the step of moving the roller shutter 12 by a predetermined distance D1 from the extended end-stroke position to the wound end-stroke position is carried out by means of a stepped movement.
In particular, during this step, the command and control means 42 of the command and control unit 40 preferably command and control the electric motor of the electromechanical actuation means 16 obtaining a plurality of subsequent rolling rotations separated from each other by rotation interruptions, so as to cause said stepped movement of the roller shutter 12 on the main shielding plane SP toward the wound end-stroke position, until there is obtained said predetermined distance D1.
Preferably, said predetermined distance D1 and/or said predetermined time interval T1 is provided to the command and control means 42 through the command and communication interface 46. As mentioned previously, the command and communication interface 46 is adapted to receive signals, data and/or instructions via the most commonly used and common communication channels or methods such as radio frequency, Wi-Fi and Bluetooth or with a wired physical control device such as a push-button panel.
In particular, in this step a user or installation technician may transmit to the command and control means 42 of the command and control unit 40 such predetermined distance D1 or time T1 parameter to obtain the desired maximum or greater degree of light-darkening through the door and/or window by means of said roller shutter 12.
Advantageously, in this manner, the method for operating the roller shutter assembly 10 is particularly easy both during installation and during use.
Preferably, said predetermined distance D1 and/or said predetermined time interval T1 can be modified through the command and communication interface 46.
In particular, in this step a user or installation technician may transmit to the command and control means 42 of the command and control unit 40 such modification to the predetermined distance D1 or time T1 parameter to obtain the desired maximum or greater degree of light-darkening through the door and/or window by means of said roller shutter 12.
Advantageously, in this manner, the method for operating the roller shutter assembly 10 is particularly reliable given that it is possible to modify this predetermined distance D1 or time T1 parameter to compensate, for example, for dimensional changes of the tiltable slats 22t and/or of the transmission means 28 caused by thermal dilatation or contraction induced by changes in the environmental temperature.
A further aspect of the present invention relates to a computer program for actuating a roller shutter assembly 10 with tiltable slats for doors and/or windows, in which the roller shutter assembly 10 and the method for the operation thereof provide for the characteristics and the embodiments described above.
In particular, said computer program comprises instructions for implementing the steps of the method according to any one of the embodiments described above and variants thereof, when carried out by command and control means 42 of the command and control unit 40 of the roller shutter assembly 10.
In this manner, the computer program provides the advantages described above for the method for operating the roller shutter assembly 10.
A further aspect of the present invention relates to the command and control unit 40 for a roller shutter assembly 10 with tiltable slats for doors and/or windows, in which the roller shutter assembly 10 and the method for the operation thereof provide for the characteristics and the embodiments described above.
In particular, the command and control unit 40 is configured to command and control the electromechanical actuation means 16 so as to cause movements of the roller shutter 12 on the main shielding plane SP between the extended end-stroke position and the retracted end-stroke position, in which said extended end-stroke position is detected by means of end-position detection means.
Furthermore, said command and control unit 40 is configured to command and control the electromechanical actuation means 16 to cause tilting movements of the tiltable slats 22t with respect to the main shielding plane SP between the closing position in which said tiltable slats 22t are substantially parallel to said main shielding plane SP and an opening position in which they are tilted transversely to the main shielding plane SP.
In particular, said command and control unit 40 is configured to move the roller shutter 12 towards said extended end-stroke position in which the tiltable slats 22t are moved to the opening position by means of transmission means 28, detect the reaching of said extended end-stroke position, move the roller shutter by said predetermined distance D1 from the extended end-stroke position towards said retracted end-stroke position further moving the tiltable slats 22t from the opening position to the closing position by means of the transmission means 28 so that at said predetermined distance D1 there is obtained the maximum degree of light-darkening through said door and/or window by means of said roller shutter 12, and stop the movement of the roller shutter 12 upon reaching said predetermined distance D1.
In this manner, the command and control unit 40 provides the advantages described above for the method for operating the roller shutter assembly 10.
It is clear that there are possible further embodiments of the method for operating a roller shutter assembly 10 with tiltable slats, the computer program and the command and control unit 40 with respect to what has been described so far, without departing from the claimed scope of protection.
For example, in the description above, the roller shutter 12 has been described by providing for a distal end slat 22d comprising the movable extension element 30 which is movable with respect to the latter. However, there may be provided for an embodiment in which the roller shutter 12 provides for a distal end slat 22d which is not provided with a movable extension element 30. In particular, in this possible embodiment, the raising of the roller shutter 12 by a predetermined distance D1 is adapted to compensate for clearances in the connections of the hinge of the lateral support means 26, so as to leave the roller shutter 12 abutting through the distal end slat 22d on the abutment base 18, and move the tiltable slats 22t from the opening position to the closing position by tightening them to each other with appropriate strength.
In the light of the above, it is clear that significant results have been achieved, overcoming the drawbacks of the prior art, obtaining a method for operating a roller shutter assembly 10 with tiltable slats, a computer program and a command and control unit 40 adapted to more reliably ensure the maximum or greater degree of light-darkening.
Furthermore, this allows to ensure a more reliable movement of the slats in the closing position to obtain the maximum or greater degree of light-darkening.
Furthermore, this allows to ensure an easy implementation in roller shutter assemblies having various types of motors adapted to move the support roller and/or various types of constructions for transmission means adapted to move the slats in the opening and closing positions, possibly using cost-effective components.
Furthermore, this allows an easy adjustment, both by the user and the installation technician, depending on the characteristics of the roller shutter and/or depending on the characteristics of the door or window in which said roller shutter is installed.
Furthermore, this allows to ensure the possibility to easily move a plurality of motor-driven roller shutters through a centralised control system, providing to the latter predetermined distances D1 or predetermined time intervals T1 associated with each roller shutter assembly 10.
Naturally, the materials and equipment used to implement the present invention, as well as the shape and dimensions of the individual components, may be the most suitable depending on the specific requirements.

Claims

Method for operating a roller shutter assembly (10) with tiltable slats for door and/or window, wherein said roller shutter assembly (10) includes:
i) a roller shutter (12) adapted to be wound around a support roller (14) rotatable by means of electromechanical actuation means (16),
said roller shutter (12) comprising tiltable slats (22t) and transmission means (28) connecting said support roller (14) with said tiltable slats (22t) to adjust an inclination thereof, and

ii) a command and control unit (40) configured to command and control said electromechanical actuation means (16) to cause:
- movements of the roller shutter (12) on a main shielding plane (SP) between an extended end position and a retracted end position, in which said extended end position is detected by means of end-position detection means (42, 50), and

- tilting movements of the tiltable slats (22t) with respect to said main shielding plane (SP) between a closing position wherein said tiltable slats (22t) are substantially parallel to said main shielding plane (SP) and an opening position wherein said tiltable slats (22t) are tilted transversally to said main shielding plane (SP),

said method being implemented by said command and control unit (40) and being characterised in that it comprises the steps of:
- moving said roller shutter (12) towards said extended end position, wherein at said extended end position said tiltable slats (22t) are moved to said opening position by means of said transmission means (28),

- detecting the reaching of said extended end position,

- moving said roller shutter (12) by a predetermined distance (D1) from said extended end position towards said retracted end position, wherein in said step of moving the roller shutter (12) by said predetermined distance (D1) said tiltable slats (22t) are further moved from said opening position to said closing position by means of said transmission means (28),
so as to obtain at said predetermined distance (D1) a maximum degree of light-darkening through said door and/or window by means of said roller shutter (12),

- stopping the movement of the roller shutter (12) upon reaching said predetermined distance (D1).
The method according to claim 1, wherein said predetermined distance (D1) is obtained by moving the roller shutter (12) from said extended end position towards said retracted end position for a predetermined time interval (T1).
The method according to claim 1 or 2, wherein said electromechanical actuation means (16) include an electric motor comprising a first winding and a second winding, and
said command and control unit (40) comprises detection means (50) adapted to detect a first signal (S1) related to the current of the first winding and a second signal (S2) related to the current of the second winding, wherein

said step for detecting the reaching of said extended end position comprises the step for detecting a given signal-variation of a signal (S1, S2) with respect to the other signal (S1, S2).
The method according to claim 3, wherein said electric motor comprises a mechanical limit switch configured to stop a signal (S1, S2) of said signals (S1, S2) at said extended end-stroke position, and
said step for detecting the reaching of said extended end position comprises the step for detecting a stop of a signal (S1, S2) with respect to the other signal (S1, S2).
The method according to claim 3 or 4, wherein said signals (S1, S2) are combined together forming a combination signal, said combination signal being configured so that from said combination signal it is obtainable said given signal-variation of a signal (S1, S2) with respect to the other signal (S1, S2).
The method according to any of the preceding claims, wherein said roller shutter (12) comprises a distal end non-tiltable slat (22d) adapted to abut against an abutment base (18) when said roller shutter (12) is in said extended end position, said distal end non-tiltable slat (22d) comprising a movable extension element (30) which is movable between a position of maximum protrusion and a position of maximum insertion with respect to said distal end non-tiltable slat (22d).
The method according to any of the preceding claims, wherein said predetermined distance (D1) and/or said predetermined time interval (T1) is provided by means of a command and communication interface (46).
The method according to any of the preceding claims, wherein said predetermined distance (D1) and/or said predetermined time interval (T1) can be modified by means of a command and communication interface (46).
Computer program for operating a roller shutter assembly (10) with tiltable slats for door and/or window, said computer program comprising instructions adapted to implement the steps of the method according to any of the preceding claims, when the program is run by a command and control unit (40) of said roller shutter assembly (10).
Command and control unit (40) for a roller shutter assembly (10) with tiltable slats for door and/or window, wherein said roller shutter assembly (10) includes:
i) a roller shutter (12) adapted to be wound around a support roller (14) rotatable by means of electromechanical actuation means (16),
said roller shutter (12) comprising tiltable slats (22t) and transmission means (28) connecting said support roller (14) with said tiltable slats (22t) to adjust an inclination thereof, wherein

said command and control unit (40) is configured to command and control said electromechanical actuation means (16) to cause:
- movements of the roller shutter (12) on a main shielding plane (SP) between an extended end position and a retracted end position, in which said extended end position is detected by means of end-position detection means (42, 50), and

- tilting movements of the tiltable slats (22t) with respect to said main shielding plane (SP) between a closing position wherein said tiltable slats (22t) are substantially parallel to said main shielding plane (SP) and an opening position wherein said tiltable slats (22t) are tilted transversally to said main shielding plane (SP),

said command and control unit (40) being characterised in that it is configured for:
- moving said roller shutter (12) towards said extended end position, wherein at said extended end position said tiltable slats (22t) are moved to said opening position by means of said transmission means (28),

- detecting the reaching of said extended end position,

- moving said roller shutter (12) by a predetermined distance (D1) from said extended end position towards said retracted end position, wherein in said step of moving the roller shutter (12) by said predetermined distance (D1) said tiltable slats (22t) are further moved from said opening position to said closing position by means of said transmission means (28),
so as to obtain at said predetermined distance (D1) a maximum degree of light-darkening through said door and/or window by means of said roller shutter (12),

- stopping the movement of the roller shutter (12) upon reaching said predetermined distance (D1).