FR2961248A1 - MOTORIZED STORAGE MONO-ORDER - Google Patents

Abstract

The invention relates to a motorized blind comprising a winding shaft (18) and an apron having a lower ballast edge and at least one windable portion (24) connecting said lower ballast border and said winding shaft (18). The windable portion (24) is adapted to be wrapped around said winding shaft, which is intended to be rotated to unwind the rollable portion (24) and cause the drive of said bottom ballast in translation. The motorized blind further comprises a stop mechanism (46) for causing the rotation stop of said winding shaft (18) as soon as said lower ballast border is locked in translation. According to the invention, the stop mechanism (46) engages with said winding shaft (18) to mechanically lock said winding shaft in rotation when said at least one windable portion (24) expands.

Description

1 mono-controlled motorized blind

The present invention relates to a motorized blind comprising a winding shaft and an apron integral with the winding shaft and whose deployment of the deck is able to be interrupted when it encounters an obstacle. Known motorized blinds with adjustable blades are installed along the bay windows. They comprise on the one hand a winding shaft mounted in an upper part of the bay and a set of stackable blades having a terminal support blade capable of stackably receiving the other blades of said set of blades. The winding shaft is controllable in rotation by means of an electric motor. On the other hand, the blinds comprise retaining means for retaining each of said blades and drive ribbons, usually called lacettes, and connecting said terminal support blade and the winding shaft freely passing through the other blades. The ribbons are capable of being wound around the winding shaft, while the free support blade exerts on them a tension under the effect of gravity. The winding shaft is intended to be rotated to unwind the ribbons and cause the vertical drive of the terminal support blade in translation between a close position and a position remote from said shaft in which said retaining means retain close in near said other blades facing said bay, while said final blade is suspended from the ribbons. To avoid any disorder of the lacettes when the final blade encounters an obstacle, an attempt has been made in this case to interrupt the movement of the motor by various methods. Also according to FR 2 149 395, the motorized blind further comprises a stop mechanism comprising a control rod pivotally mounted in a direction substantially parallel to the winding shaft and adapted to come into contact with at least one one of the ribbons. When the terminal support blade meets an obstacle and locks in translation, then the ribbon relaxes and the control rod pivots to actuate an electric switch to stop the control motor in rotation of the winding shaft.

The disadvantage of this device lies in the reliability of the stop mechanism and the rotation stop control of the winding shaft. Indeed, the control rod has a certain flexibility which requires a complete release of the ribbon for the switch is actuated, and efforts to exert on it to control the stopping of the electric motor are relatively important. In addition, if the motorized blind has only one stop mechanism for a single ribbon winding, and the final blade encounters an obstacle next to another ribbon winding, not equipped, it will take several seconds before that said other ribbon winding finally feels the voltage anomaly; the final blade then being stopped while it has a very pronounced slope, which is both unsightly and risky. We can of course overcome this disadvantage by equipping each of the ribbon windings around the winding shaft of a stop mechanism, but we find ourselves quickly having to manage many electrical conductors, including microswitches and a Electric box. This significantly increases the price of the product. Also, a problem that arises and that the present invention aims to solve is to provide a motorized blind including a more reliable and more economical stopping mechanism, capable of interrupting the movement of the final blade, whatever the where the obstacle is. For this purpose, the present invention provides a motorized blind comprising a winding shaft and an apron integral with said winding shaft. Said apron having a lower ballast border and at least one windable portion connecting said lower ballast border and said winding shaft, said at least one windable portion being adapted to be wound around said winding shaft, while said edge lower ballast exerts a tension on said at least one rollable portion, said winding shaft being adapted to be rotated to unwind said at least one rollable portion and cause driving said lower translational ballast border in a opposite direction to said winding shaft, said motorized blind further comprising a stop mechanism mounted along said winding shaft and adapted to come into contact with said at least one windable portion, said stop mechanism being intended to cause stopping in rotation of said winding shaft as soon as said lower ballast border is blocked in translation and said at least one rollable portion relaxes; according to the invention said stop mechanism engages said winding shaft to mechanically lock said winding shaft in rotation when said at least one windable portion expands. Thus, a feature of the invention lies in the implementation of a stop mechanism, maintained in a fixed position along the winding shaft, which does not act on a switch to cut off the power supply. the drive motor of the shaft, but which comes directly into engagement with the shaft to lock it mechanically and thus interrupt the electric motor. Indeed, the latter is equipped, for example, with a device for measuring the speed of rotation of its rotor, and when this speed undergoes a sudden change, in this case a deceleration, the power supply is then cut off. instantly and the engine stopped. In this way, unlike the motorized blinds according to the prior art, for which the stop mechanism acts on the power supply of the motor via a switch, which induces a certain response time in stopping the According to the invention, the rotating winding shaft is instantaneously mechanically locked in rotation and it is this blockage which causes the electric motor to stop. Therefore, the reliability of the stop mechanism, and hence the efficiency of the rotational stop of the winding shaft is large. Also, as soon as the lower ballast meets an obstacle, and the rollable portion relaxes, the winding shaft whose rotation allows the deployment of the deck, is instantly immobilized. According to a feature of the invention particularly advantageous, said winding shaft comprises a tubular member adapted to receive a tubular motor inside said tubular member for driving said tubular member in rotation. In this way, the motorized blind can not only be produced at an advantageous cost, because these tubular motors associated with a tubular member are produced in large series for many other applications and therefore at an advantageous cost. They are used in particular for shutter type applications. They are also more compact. However, motorized blinds, according to the prior art, are usually equipped with a central motor dual output and therefore double reducer, which makes them on the one hand more complex, and on the other hand more expensive. In addition they are larger, and therefore the housing that hosts such a type of engine must also be of a larger volume. Furthermore, the winding shaft advantageously has a catching tooth intended to cooperate with said stop mechanism to mechanically lock said winding shaft in rotation. Thus, as the winding shaft deploys the apron, as soon as the state of the stopping mechanism is changed by the voltage drop in the windable part, it is driven radially towards the winding shaft and the attachment tooth which protrudes from the shaft. And, simultaneously when the gripping tooth rotational movement comes to the stop mechanism, it then engages in it and the shaft locks in rotation. The stop mechanism is indeed securely moored in the blind casing so as to hold the winding shaft. More specifically, with regard to the stopping mechanism, it advantageously comprises a movable probe member having a first fastening end and a first contact end opposite said first fastening end and able to come into contact with said at least one part. rollable. The first fixing end is preferably pivotally mounted along an axis substantially parallel to said winding shaft. Thus, the feeler member pivots, for example in a cradle traversed by the winding shaft 25, which cradle is mounted in a fixed position in the aforementioned casing. The contact end of the feeler member, against which the rollable portion is frictionally driven, extends substantially perpendicular to the center of the winding shaft, while the fastening end extends in a position offset laterally from the center of the shaft. The probe member thus extends in arc opposite the winding shaft. In addition, said stop mechanism preferably comprises a return spring of said feeler member for driving said feeler member in motion when said at least one rollable portion relaxes. Advantageously, and according to the aforementioned preferred embodiment, said feeler member is pivotally driven when said at least one rollable portion expands. Thus, when the rollable portion is under tension under the weight of the lower ballast edge, it then exerts a force on the contact end of the feeler member which is then held in a pivoted position where its contact end is removed of the winding shaft and in which the return spring is compressed. There is thus a stable equilibrium between the force of the roll-up portion on the contact end and the return force of the spring. Also, as soon as the lower ballast edge encounters an obstacle, the windable portion 10 is expanded and the return spring causes the feeler member to pivot and the contact end of the winding shaft to move closer together. It is this pivoting of the feeler member that allows the stop mechanism to engage the winding shaft to mechanically lock it. In addition, said stop mechanism preferably comprises a movable locking member having a second fixing end and a second contact end opposite said second fixing end adapted to engage said winding shaft. Preferably, the second fixing end of the locking member is pivotally mounted along an axis substantially parallel to said winding shaft. Thus, as soon as the feeler member is pivotally recalled by virtue of its return spring, simultaneously, the second contact end of the locking member, which is advantageously provided with a hook, comes into contact with the winding shaft and in particular with the above-mentioned catching tooth. According to a particularly advantageous embodiment of the invention, the feeler member and the locking member form two distinct parts and said feeler member is intended to be driven in motion to come into contact with said locking member. so as to cause said locking member to move. Preferably, said feeler member pivots to come into contact with said locking member so as to drive said locking member which pivots in turn. Such a feature allows, as will be explained below, the locking member to remain in the locking position, while the contact member can return to its pivoted position when the rollable portion is at again switched on.

Furthermore, it will be observed that the feeler member and the locking member may also, according to yet another embodiment, be movably mounted in translation to perform functions identical to the stop mechanisms. It is also envisaged that one is mobile in translation while the other is pivotal. According to a particularly advantageous embodiment of the invention, said apron comprises, on the one hand, a set of blades having a terminal support blade forming said lower ballast border, and on the other hand at least one drive ribbon passing through said other blades and forming said at least one rollable portion. Also, said shaft has a circular track for receiving said at least one coiled drive tape. Preferably, the circular track is formed in the bottom of a grooved pulley, so as to guide perfectly the winding of the tape on itself. It will be observed that the apron may also consist of a fabric capable of coming to wind around the winding shaft, and the rollable part adapted to cooperate with the stop mechanism is formed by one of the borders. side of said fabric. In addition, and according to yet another embodiment, the motorized blind further comprises: adjustable retaining means comprising a cord and an angular segment secured to said cord, together forming a loop around said winding shaft, said segment angular being able to be driven angularly by friction by said shaft to adjust the orientation of said blades; and also a movable locking cap for locking said angular segment with respect to said winding shaft in an intermediate angular position corresponding to a determined orientation of said blades; and finally, an unlocking element for driving said movable locking cap and for causing the release of said angular segment when said at least one driving tape is unwound. As will be explained below in more detail, such features allow the deployment of the deck consisting of stackable blades with a position of the latter inclined relative to the vertical so as to avoid total occultation of the premises during of this deployment.

Other features and advantages of the invention will appear on reading the following description of a particular embodiment of the invention, given by way of indication but not limitation, with reference to the accompanying drawings in which: Figure 1 is a schematic perspective view of detail of elements of the motorized blind according to the invention; - Figure 2 is a schematic perspective view of detail of the elements shown in Figure 1, three quarters forward right; Figure 3 is a diagrammatic perspective view of the details of the elements illustrated in Figure 1, of three quarters front left; - Figure 4 is a schematic cross-sectional view of the element shown in Figure 2; Figure 5 is a schematic perspective view of another element illustrated in Figure 1; Figure 6 is a schematic perspective view of the element shown in Figure 2, of three quarter-rear right and equipped with said other element shown in Figure 5; Figure 7 is a schematic perspective view of detail of the object shown in Figure 6; Figure 8 is a schematic cross-sectional view of the object shown in Figure 1 in a first operating position; and, - Figure 9 is a schematic cross-sectional view of the object shown in Figure 1 in a second operating position. Figure 1 partially illustrates a winding shaft comprising a tubular member 10 adapted to receive inside a tubular motor not shown. The tubular member 10 extends longitudinally along an axis of symmetry A and here passes through a return assembly 14, which comprises a cradle 16 intended to be held in a fixed position inside a longitudinal casing not shown and including the tubular member 10. The cradle 16 30 accommodates inside a functional sleeve 18 in which is fitted the tubular member 10 and to which it is connected in rotation through a longitudinal groove 20 of the tubular member 10. In addition, the cradle 16 has an upper window 17 and it comprises a movable cover 22 installed through the upper window 17 and which is able to cooperate with the functional sleeve 18 as will be explained hereinafter. In addition, the movable hood 22 has in each of its corners, a fastening pin 19 and the fixing studs 19 of the movable cowl 22 are respectively engaged in an oblong orifice 23. Thanks to the oblong holes which extend in the lateral edges of the upper window 17, in directions which cut the tubular member 10, the cover 22 is movable in translation between a close position and a spaced apart position of the functional sleeve 18, while remaining prisoner of the cradle 16. The elements described herein above are intended for the operation of a motorized blind with adjustable blades not shown. Such a blind comprises a winding shaft formed of the tubular member 10 and a set of blades having a terminal support blade, or final blade, adapted to receive in stack the other blades of said set of blades. In addition, such a blind further comprises at least one other lift assembly 14 identical and spaced from the first. Also, and advantageously, the tubular member 10 is equipped with at least one lift assembly at each of its ends. Furthermore, the motorized blind comprises, for each of the lift assemblies 14, a drive tape 24 forming the rollable portion and 20 for connecting the not shown support blade and the winding shaft formed of the tubular member 10. In addition, the drive tape 24 is adapted to pass through the other blades of the set of blades not shown here . Also more clearly shown in Figure 2 is the functional sleeve 18 around which the ribbon 24 is wound between two adjacent coaxial ribs 26, 28 forming the two opposite flanks of a pulley. The drive ribbon 24 is thus wound on itself around a circular track formed around the functional sleeve 18 and concealed, in FIG. 2, by the coaxial ribs 26, 28. Also, the support blade, not shown, exerts a tension T on the tape in a direction opposite to the functional sleeve 18. The latter has an axial inner rib 30 intended to engage inside the longitudinal groove 20 of the tubular member 10 illustrated in FIG. so that the rotational movement of the tubular member 10 induces the rotation of the functional sleeve 18 and causes the unwinding of the ribbon and thus the drive of the terminal support blade in translation opposite the tubular member 10. Moreover , the functional sleeve 18 has, on the one hand, a groove 32 of trapezoidal axial section, adjacent to the pulley formed by the two coaxial ribs 26, 28, and which will be described hereinafter in more detail on the Figur e 6, and secondly a truncated rib 34 circular. This truncated rib 34 constitutes a rock wheel and it extends in a plane substantially perpendicular to the axis of the functional sleeve 18 and the tubular member 10, opposite the pulley formed by the two coaxial ribs 26, 28 defines with respect to the trapezoidal groove 32. It defines a first free end 36 forming a hooking tooth projecting from the functional sleeve 18 with two opposite reinforcing cheeks 38, 40, on each side and joined by a bridge 42 which extends in an axial direction. Opposite the first free end 36 forming a hooking tooth, the truncated rib 34 has a second free end 44 chamfered and able to form ramp. Also, the truncated rib 34 has a notch 45 between its two opposite free ends 36, 44. In addition, the motorized blind comprises a stop mechanism 46 installed along the functional sleeve 18, and integral with the cradle 16 not shown in this Figure 2. This stop mechanism 46 comprises firstly a sensor member 48 installed facing the pulley formed by the two adjacent coaxial ribs 26, 28 to cooperate with the ribbon 24 and a locking member 50 installed opposite of the truncated rib 34 to cooperate with the attachment tooth 36. The locking member 50 and the feeler member 48 are thus mounted at a distance from each other along the functional sleeve 18. It will be observed that the locking member 50 has a general prismatic shape, the advantages of which will be explained below, whereas the feeler member 48 extends in an arc. The latter has a first fastening end 52 on the inside of the cradle 16 and a first opposite contact end 54 against which the ribbon 24 bears substantially in alignment with the axis M of the functional sleeve 18. Thus, the first contact end 54 and the first attachment end 52 are radially spaced from the tubular sleeve 18 substantially the same distance and angularly offset relative to each other with respect to the functional sleeve 18.

The feeler member 48 is presented in a vacuum in FIG. 2 for explanation purposes. On the other hand, its attachment end 52 is pivotally mounted on the inside of the cradle 16 about a feeler member axis 56 substantially parallel to the axis M of the functional sleeve 18. In addition, the feeler member 48 has a heel 58 in which is housed a return spring 60 adapted to extend behind the feeler member 48 to abut against the inside of the cradle 16. Therefore, the feeler member 48 is rotated by the return spring 60 for driving the first contact end 54 towards the functional sleeve 18. This is actually the ribbon 24 when stretched which exerts efforts on the first contact end 54 tending to move it away from the sleeve 18 and thus to compress the return spring 60. In this way, when the functional sleeve 18 is rotated through the tubular member 10, the ribbon 24 is stretched in friction against the first end. contact tee 54 of the probe member 48 which is then held pivoted in a position away from the functional sleeve 18. The locking member 50 has a second attachment end 62 pivotally mounted on the inside of the cradle 16 around a locking member pin 64 substantially parallel to the feeler member axis 56. Opposite the second fastening end 62, the locking member 50 has a second contact end 66 having a return 68 forming a hook oriented towards the axis M of the functional sleeve 18. In addition, the feeler member 48 has between these two opposite ends 54, 52 a profiled lateral lug 70 oriented towards the locking member 50, 25 while the locking member 50 has between its two opposite ends 62, 66 a receiving profile 72 oriented towards the feeler member 48 so as to cooperate with the profiled lateral lug 70. We find more precisely in Figure 3 the profile 72 of the locking member 50 and the lateral profiled lug 70 of the probe member 48. The receiving profile 72 is open in a direction opposite to the functional sleeve 18, while the lateral profiled lug 70 s extends with regard to the opening of this reception profile 72.

Thus, when the functional sleeve 18 is rotated in a clockwise direction in FIG. 3, via the tubular member 10 not shown, the ribbon 24 is unwound in a direction opposite to the functional sleeve 18 to allow the deployment of the deck consisting of the aforementioned blades. The ribbon 24 is then stretched and is frictionally driven against the first contact end 54 of the feeler member 48 which is then kept away from the functional sleeve 18. It will also be observed, on the one hand, that in this operating phase , the locking member 50 is independent of the feeler member 48, and secondly that the truncated rib 34, while rotating, makes it possible to maintain the second contact end 66 of the locking member at a distance from the functional sleeve 18, except between the two opposite ends 36, 44 of the truncated rib 34. It will be explained below, with reference to FIG. 4, that such a characteristic is advantageous when the functional sleeve 18 is rotated in the opposite direction. Referring back to FIG. 3, in a phase of deployment of the apron, since the terminal support blade of the blade deck encounters an obstacle, the ribbon 24 relaxes and relaxes while the tubular member and the functional sleeve 18 continue their rotation. Also, when the tension in the ribbon 24 drops, the feeler member 48 then pivots by the action of its return spring 60 and the first contact end 54 of the feeler member 48 is driven towards the sleeve 18. As a result, the lateral lateral lug 70 bears against the inside of the receiving profile 72 of the locking member 50 and, while continuing its stroke, causes the locking member 50 to pivot in the same direction. direction and thus induces the approaching of the second contact end 66 towards the functional sleeve 18. This second contact end 66 then bears against the truncated rib 34 as shown in FIG. 4. the functional sleeve 18 is rotated in a counterclockwise direction, corresponding to the operating phase described above at the location of FIG. 3. And as soon as the notch 45 of the truncated rib 3 4 comes opposite the second contact end 66, the locking member 50 then pivots towards the axis M of the functional sleeve 18, and the second contact end 66 penetrates inside the notch 45, while the catching tooth 36 engages against the return 68 forming a hook of the locking member 50. In this way, the functional sleeve 18 and the tubular member 10 which drives it in rotation, are stopped net, and the tubular motor that drives them is stopped. Indeed, the tubular motor comprises means for measuring the speed of rotation of its rotor. And as soon as this speed of rotation falls suddenly, the tubular motor is stopped. The force exerted by the hooking tooth 36 on the locking member 50 is relatively important with regard to the rigidity of the connection between its second attachment end 62 and the inside of the cradle 16. Also, the body 50, when it receives the hooking tooth 36, is forced between the inner wall of the blind casing not shown and the functional sleeve 18 and thanks to its prismatic wedge shape, it hangs tangentially relative to the functional sleeve 18. Such an operation assumes that the connection between the second fastening end 62 of the locking member 50 and the inside of the cradle 16 is substantially deformable to allow the tangential movement of the locking member 50. when the ribbon 24 expands, the stop mechanism 46 causes the mechanical locking of the tubular member 10 in rotation. In addition, when the terminal support blade is released from its obstacle, the ribbon 24 becomes taut again, and the feeler member 48 then pivots by releasing the locking member 50. The last nonetheless remains in its position of retaining the tooth 8, as long as the functional sleeve 18 has not been rotated in an opposite direction, so that the final blade can move up and away from the obstacle which can then be eliminated . In addition, when it is rotated in the opposite direction, the second chamfered free end 44 of the truncated rib 34 forms a ramp and bears against the return edge 68 of the second contact end 66 which causes the tilting of the locking member 50 towards its initial position. Thus, when the functional sleeve 18 is again rotated in the direction of unwinding of the ribbon 24, the attachment tooth 36 escapes the return range 68 of the second contact end 66 and the apron can thus again deploy.

Referring now to Figures 5 and 6, illustrating for the first, adjustable retaining means 80 of the apron blades and for the second, these adjustable retaining means 80 installed in the trapezoidal groove 32 of the functional sleeve 18. Thus, on 5, the adjustable retaining means 80 comprise a cord 82 and an angular segment 84. This angular segment 84 has two opposite segment cheeks 86, 88 spaced apart from each other. Each of these flanges 86, 88 is substantially inclined relative to a median plane extending between the two so as to be able to engage the trapezoidal groove 32 forming a clutch. Moreover, the cord 82 extends in an arc between the two cheeks 86, 88 of the angular segment 84 and is locked therein in translation by means of a crimped element 90 held in a fixed position inside the segment 84 The segment 84 and the cord 82 thus form a loop, of which two opposite strands 92, 94 extend to receive the opposite posts 15 of the support ladder of the apron blades. Thus, the rotation of the tubular member, and from the functional sleeve 18 causes the driving of the segment 84 engaged within the trapezoidal groove 32, which allows to drive in translation the two opposing strands 92, 94 in opposite directions, and thereby simultaneously changing the orientation of the apron blades. In addition, the segment 84 has two opposite abutment ends, a rising abutment end 96, and a downward abutment end 98, respectively able to bear against opposite abutments, a return abutment 99 and a downstop 101, arranged in the cradle 16 and which can be seen in Figures 8 and 9 which will be referred to below. As a result, the segment 84 is held in a fixed position when its upstanding rest end 96 bears against the upstart stop 99, and the functional sleeve 18 is rotated clockwise in FIG. , to fold the apron. Also, the two opposite walls of the trapezoidal groove 32 are respectively slidably driven against the two opposite cheeks 86, 88 of the segment 84. In this position of the segment 84, the apron blades are inclined horizontally in a position of transparency.

Before describing the unfolding of the deck, where the functional sleeve 18 is rotated in a counter-clockwise direction, it will be described in more detail with reference to FIG. 7. Thus, the functional sleeve 18 has a suitable spring rod 100. to be activated when the circular track of the pulley formed by the two coaxial ribs 26, 28, is released from the ribbon 24. This is the case when the apron approaches its fully deployed position. The spring rod 100 has an anchor portion 102 which extends in an arc along a circular fastening rib 104 adjacent to one of the coaxial ribs 26 and a return portion 106 extending in one direction. axial across the groove of the pulley formed by the two ribs facing coaxial 26, 28. To do this, the circular binding rib 104 has a radial oblong hole 108 non-opening for guiding and retaining the return portion 106 while the two coaxially facing ribs 26, 28 respectively have two radial slots 110, 112 facing each other in the axial extension of the radial oblong hole 108. Thus, the return portion 106 is in this Figure 7, in its free position. away from the circular track of the pulley formed by the two coaxial ribs 26, 28. When the ribbon 24 is wrapped around the pulley, the return portion 106 is held against the circular track in the bottom of the pulley. Referring again to Figures 8 and 9, which include the cradle 16 and the functional sleeve 18 inside and the movable cover 22. The latter has, inside, a stop tab 114 adapted to extend between the two opposite cheeks 86, 88 of the segment 84, while the latter has a stop bridge 116 which extends precisely between the two opposite cheeks 86, 88, substantially halfway between the two opposite bearing ends 96, 98. There are also in these Figures 8, 9, the fixing studs 19 and oblong holes 23 within which they are engaged.

Thus, from an angular position where the segment 84 is held in a fixed position and its upstanding rest end 96 bears against the upstop stop 99, when the functional sleeve 18 is rotated counterclockwise as illustrated in Figure 8, not only does the segment 84 engage within the trapezoidal groove 32, and the opposing strands 92, 94 are driven to rotate the apron blades which then take a semi-occultation position, corresponding to inclined blades, but also the ribbon 24 unfolds to deploy the deck, while the movable hood 22 is in a position close to said functional sleeve 18. The stop tab 114 is then engaged between the two opposite cheeks 86, 88 of the segment 84, while the stop bridge 116 abuts against the stop tab 114, which blocks the angular segment 84 in a positive position. intermediate angular ion corresponding to an inclined position of the blades. With the functional sleeve 18 continuing to rotate, the two opposite walls of the trapezoidal groove 32 are respectively slidably driven against the two opposite cheeks 86, 88 of the segment 84. When the apron approaches its fully deployed position, all the blades of the game of blades rest in the scales and the ribbon 24 does not suddenly support anything, and the additional rotation of the functional sleeve 18 causes the release of the ribbon 24. The total length of the ribbon 24 is determined so that it relaxes at a time of unwinding where it covers only an angular fraction of the circular track. Thus, the ribbon 24 releases the return portion 106 which is initially applied against the circular track and which is then driven into a position away from the circular track by the spring rod 100 which expands. The return portion portion 106 which extends between said one of the coaxial ribs 26 and the adjacent circular fastening rib 104, and which thus radially deviates from the functional sleeve 18 abuts against an interior receiving area of the hood. mobile 22 and drives the latter in motion in a position spaced from the functional sleeve 18, as shown in Figure 9. In this way, the stop bridge 116 escapes the stop tab 114, and the functional sleeve 18 pursuing its rotational stroke, it then drives the angular segment 84 in motion over an angular fraction, until the downward abutment end 98 of the segment 84 bears against the abutment stop 101. Thanks to this movement angular segment 84 on said angular fraction, the blades of the set of blades are oriented vertically in the occultation position. In addition, the ribbon 24 is further expanded and the stop mechanism 46 is activated as indicated above, so as to mechanically lock the functional sleeve 18 and the tubular member 10 and therefore to stop the tubular motor. It will be recalled, on the one hand that the stop mechanism comprising the feeler member 48 and the locking member 50, can be made in one piece, and secondly that it can be adapted to blinds no longer with blades, but with canvas. Io The mechanism is then installed near the tubular member and at the edge of said fabric.

Claims (10)

REVENDICATIONS1. Motorized blind comprising a winding shaft (10, 18) and an apron integral with said winding shaft, said deck having a lower ballast border and at least one windable portion (24) connecting said lower ballast border and said ballast shaft. winding (10, 18), said at least one windable portion (24) being adapted to be wound around said winding shaft, while said lower ballast edge exerts a tension on said at least one windable portion (24), said winding shaft (10, 18) being adapted to be rotated to unwind said at least one rollable portion (24) and to drive said lower ballast border in translation in a direction opposite to said shaft of winding (10, 18), said motorized blind further comprising a stop mechanism (46) mounted along said winding shaft and adapted to come into contact with said at least one windable portion (24), a stop mechanism (46) being adapted to cause the rotational arrest of said winding shaft (10, 18) as soon as said lower ballast border is locked in translation and said at least one windable portion expands; characterized in that said stop mechanism (46) engages said winding shaft (10,18) to mechanically lock said winding shaft in rotation when said at least one windable portion (24) expands. 2. Motorized blind according to claim 1, characterized in that said winding shaft (10, 18) comprises a tubular member adapted to receive a tubular motor inside said tubular member (10) for driving said tubular member into rotation. 3. Motorized blind according to claim 1 or 2, characterized in that said winding shaft (10, 18) has a hooking tooth (36) intended to cooperate with said stop mechanism (46) for mechanically locking 30 said winding shaft (10, 18) in rotation. Motorized blind according to any one of claims 1 to 3, characterized in that said stop mechanism (46) comprises a movable feeler member (48) having a first fixing end (52) and a first contact end ( 54) opposite said first fixing end (52) and adapted to come into contact with said at least one rollable part (24). 5. Motorized blind according to claim 4, characterized in that said stop mechanism (46) comprises a return spring (60) of said feeler member (48) for driving said feeler member in motion when said at least one rollable portion ( 24) relaxes. Motorized blind according to any one of claims 1 to 5, characterized in that said stop mechanism (46) comprises a movable locking member (50) having a second fixing end (62) and a second end contact member (66) opposite said second securing end adapted to engage said winding shaft (10, 18). 7. motorized blind according to claims 4 and 6 or 5 and 6, characterized in that said probe member (48) is intended to be driven in motion to come into contact with said locking member (50) so as to cause said blocking member in motion. 8. Motorized blind according to any one of claims 1 to 7, characterized in that said apron comprises on the one hand a set of blades having a terminal support blade forming said lower ballast border and on the other hand at least one driving tape (24) passing through said other blades and forming said at least one rollable portion. 9. Motorized blind according to claim 8, characterized in that said winding shaft (10, 18) has a circular path for receiving said at least one wrapped drive tape (24). 10. Motorized blind according to claim 8 or 9, characterized in that it further comprises: - adjustable retaining means comprising a cord (82) and an angular segment (84) integral with said cord, forming a loop together around said winding shaft (10, 18), said angular segment being able to be angularly driven by friction by said winding shaft (10, 18) to adjust the orientation of said blades; a movable locking cap (22) for locking said angular segment (84) with respect to said winding shaft (10, 18) in an intermediate angular position corresponding to a determined orientation of said blades; and, an unlocking member (100) for driving said movable locking cap (22) and for causing the release of said angular segment (84) when said at least one driving tape (24) is unwound.