EP0844362A1 - Automatic stop device for a motordrive of a roller shutter winding tube - Google Patents

Abstract

The mechanism comprises an automatic stop for a tubular electric motor which drives the roller tube of a roller blind which is required to come to a stop at a predetermined position. A device responds to the coupling exerted on the motor housing (14) of the motor. This device includes a single switch (21,22) operating with the rolling movement and a mechanical device (31,31-45) which acts on the switch to bring it into operation. This mechanism may operate only in a set part of the blind operation in order to detect when the coupling exerted exceeds a given threshold, indicating that the blind has reached the end of its movement.

Description

The invention relates to an automatic stop device. a tubular electric motor driving a tube for rolling up a rolling shutter or the like coming in stop in high rolled up position, comprising a tripping device reacting to the torque exerted on the motor housing by the winding shaft of so as to interrupt the power supply to the motor when an increase in torque due to the arrival of the shutter rolling in high position.

Such a device is known from the EP patent application 0 703 344. This device includes, for each direction of moving the shutter, a controlled switch by a mechanism reacting to an increase in torque and a switch controlled by a mechanism measuring the path traveled by the roller shutter. AT the winding, when the roller shutter curtain is suspended, the torque exerted on the motor by the flap rolling is greater than the trigger value up to a certain degree of winding and the torque-dependent switch is open, but it is bypassed by the switch controlled by the mechanism measuring the distance traveled, the contact of this switch being closed. In a second phase, when the roller shutter approaches its upper stop, the torque becomes lower than its tripping value and the corresponding switch closes. Immediately after, the mechanism measuring the path traveled, adjusted accordingly, opens its switch and the engine continues to be powered by the torque-dependent switch. In a third phase, when the rolling shutter meets its stop high, the torque exerted on the motor increases sharply due to the retention of the roller shutter against its stop and the corresponding switch opens, causing the engine to stop. On the descent, a third switch is controlled by the mechanism measuring the distance traveled to interrupt power to the motor when the path traveled corresponds to a complete rolling shutter sequence. This switch is in series with a fourth switch controlled by means reacting to exceeding a certain value of the downhill torque to stop the engine in case the roller shutter encounters an obstacle. This device has the advantage of allow the shutter to stop at the top stop by the detection of a moderate overshoot. In indeed, if we only used the detection of a overtorque to stop the engine, this overtorque should be significantly greater than the maximum torque appearing when rolling up the roller shutter at the moment when the entire roller shutter deck is suspended, as can be seen on the curve shown in the Figure 1 of EP 0 703 344 or Figure 10 of attached drawing. Using a second switch of shunting controlled by a mechanism measuring the path traveled by the roller shutter makes it possible account for the variation in torque than in the last part, low, of the curve, which allows to obtain a safe engine shutdown with only a fraction of the max torque This prevents deterioration of the roller shutter due to excessive traction exerted on it when it reaches the stop high.

This prior art device however requires two pairs of switches and, in any case, one mechanism measuring the distance traveled. Furthermore, in execution according to the prior art, the means reacting to torque with switches correspondents are mounted on the outside of the tube while the mechanism measuring the path traveled and corresponding switches is mounted inside the winding tube. The overall size is therefore important.

The object of the invention is to produce a device operating in the same spirit as the device according to the prior art, but simpler and more compact.

The device according to the invention is characterized in that that it includes a single switch operating at winding and mechanical shutdown means service of the switch operating at the winding at less during the winding phase during which the torque exerted on the winding tube is greater than the tripping torque.

The neutralization of the switch operating at winding is therefore not done by shunting, method requiring an additional switch and resources of this switch, but by switching off switch service, i.e. by means mechanical making it ineffective or ineffective.

The device can be advantageously housed entirely in the winding tube.

Switching off the switch operating at winding can be done by different means. Mon of these means is to shift axially the switch or arm that controls this light switch. Another way is to use a flexible or two-part actuating arm by a spring and to retain, that is to say to lock this arm by means of a locking finger retractable.

Moving the switch or its lever control and the retracting finger control can also be insured by different means. One of these means is to use a movable worm axially and carrying a sliding pinion driven by a pinion itself driven with the winding tube as we know it from different stop devices at the end of the race as described, for example, in the FR 2 412 483, FR 2 599 524, FR 2 656 463 or FR patents 2,679,376.

Another control means is a cam cylindrical integral with the motor housing and having a switch-shaped groove in which is engaged a finger secured to a control member axially displaceable and the displacement of which is opposed a shock absorber whose inertia makes it possible to distinguish between a gradual increase in torque such that we meet in the first part of rolling up the roller shutter, and an increase abrupt torque due to the meeting of the upper stop, in such a way that the control member moves during a gradual increase in torque so that turn off the switch in the first part of the roller shutter winding, particularly in the part of the torque curve where the torque is greater than the tripping torque, but at do not deactivate the switch when the torque suddenly increases when the flap reaches the stop high, usually against the roller shutter box. The switch will also be actuated in the event that the roller shutter is prevented from its position completely unfolded or in said first part of its winding, that is to say as long as the torque exerted on the winding tube is less than its trigger value.

By means of a second switch, arranged symmetrically to the first switch and operated when the torque exerted on the motor housing drops below a certain value it is possible to stop the engine when the shutter is completely unrolled.

The torque required to stop the roller shutter in upper stop will generally be significantly higher than torque required to stop the roller shutter in low stop. The stop device must therefore have an asymmetry which should impose its mounting on one or the other end of the roller shutter depending on the direction of rotation of the winding tube corresponding to winding and unwinding. According to a mode preferred embodiment of the invention, the device is symmetrically constructed, but includes very simple means of establishing an asymmetry left or right so as to allow, by a very simple operation to adapt the device to a left or right mounting in a winding tube. In in short, these means consist of a tray angularly adjustable and carrying the levers actuation of the two switches, the orientation angle of the plate having the effect of requiring, side more rotation, on one side than the other from the motor housing, i.e. more compression on one side than the other, a calibrated spring determining the torque necessary for actuation of the switch.

The invention will be better understood from the description of three embodiments shown in the drawing Annex.

Figure 1 is a schematic representation of a rolling shutter capable of being fitted with the device according to the invention.

FIG. 2 is a view, broken away, in perspective, of a first mode of execution, with a tearing showing the interior of the device, shown in a position corresponding to a position partially rolling shutter.

Figure 3 is a perspective view from below of the front end of the device shown in the figure 2.

Figure 4 is a front view of the same end in which the switch operating at the winding is shown in the actuated position.

Figure 5 is a top view of the same end.

Figure 6 is a front view similar to the view shown in Figure 4 showing the device in neutral position, i.e. before positioning for mounting left or right.

Figure 7 is a front view of the device positioned according to Figure 4, at the time of the cut current at the low point.

Figure 8 is a perspective view of a second form of execution.

FIG. 9 represents a detail of FIG. 8.

Figure 10 shows the shape of the variation in torque during winding.

Figure 11 shows a third embodiment.

Figure 1 shows, as a reminder, a component rolling 1 rollable on a winding tube 2 in which is housed an engine, more specifically a motorcycle reducer 4 whose output drives a crown 3 which drives the roller 2 in rotation. Motor 4 is supported by a fixed plate 5 generally constituting the end of a box, not shown, housing the winding tube and the roller shutter. The other end of the winding tube 2 is supported, known manner, by a bearing fixed to the other cheek of the box. The motor 4 is connected by wires 7 to a control box 6 with two buttons 9 intended to control the winding or the unwinding of the rolling shutter, i.e. the rotation of the motor 4 one way or the other. The control unit 6 is connected to a power supply 8.

The automatic shutdown device shown in Figure 2 is mounted inside the winding tube 2 partially shown in Figure 2. At the end represented by the winding tube 2 in FIG. 2, is internally fixed a crown 10, one of which smooth part rests on a cylindrical support 11 serving as an end bearing for the winding tube and forming part of a support 12 fixed to the cheek of the box 5 and containing the electrical connections of the engine control supply. On this media 12 is also fixed a cage 13 of general shape cylindrical containing the means for detecting a overtorque and the means of decommissioning the switch which will be described later. This cage 13 is mounted inside an extension of the casing cylindrical 14 of motor 4 and retains, so elastic, this casing in rotation. To this end, the casing 14 is provided with two longitudinal bars 15 and 16 fixed to the inner wall of the housing by screws 17 and housed in grooves of the cage 13. These bars and these grooves 15 and 16 are arranged parallel to the common axis of the winding tube 2 and of the casing 14 and symmetrically relative to this axis. The casing 14 is retained in rotation around the cage 13 by four sets of V-shaped springs 18 arranged between each of the bars 15 and 16 and the frame 19 of the cage 13 on each side of these bars. Bars 15 and 16 are thus each retained between two sets of springs. The taring of these springs is done either by the choice of springs, or by the number of springs.

The other end of the cage 13 is terminated by a front wall 20. On this wall 20 are fixed two switches 21 and 22 arranged symmetrically relative to a plane containing the axis of the assembly and passing through the middle of a finger 23 extending towards the front of the edge of the wall 20 parallel to the axis common. This plane of symmetry, whose importance will appear later, is designated in Figure 6 by the reference A. The switches 21 and 22 are provided each of a pusher 24 and 25 respectively intended for be operated by a lever of the first kind or rocker 26, respectively 27. In addition, there are drawing two connection tabs 28 and 29 for the electrical connection of switches to motor no shown, located in the extension of the device stop.

The front wall 20 of the cage is provided, in its center, of an axis 30 merged with the geometric axis of the cage, extending between the switches and fitted of a head. Around this axis 30 is articulated a plate 31 extending approximately on a semicircle and having a plane of axial symmetry B. This plate 31 carries the levers 26 and 27 which are mounted swiveling and sliding on rods 32 and 33. coil springs 34 and 35 mounted around the rods 32 and 33 work simultaneously in compression and twist so as to simultaneously push the levers 26 and 27 against the plate 31 and to maintain these levers separated from pushers 24 and 25 of switches. Around the rod 30 is also mounted a spring 36 which holds the plate 31 against the front wall 20.

As can be seen in Figures 3, 4 and 6, the wall front 20 has two protrusions 37 and 38 in shape of crown sectors arranged symmetrically with respect to the plane of symmetry A. These protrusions 37 and 38 constitute stops against which comes abut one or the other of the levers 26 and 27, depending on the position angularly offset to the left or right of the plane of symmetry B of the plate 31 relative to the plane of symmetry A. In FIGS. 2 to 5, it is the lever 27 which is in abutment against the abutment 38, so that this lever 27 is kept axially spaced from the plate 31 and opposite the pusher 25 of the switch 22, as is particularly visible in Figure 5. The lever 26 being, on the other hand, outside the scope of the stop 37, it is pushed by its spring 34 against the plate 31. In this position, its tilting is without effect on the push-button 24 of the switch 21.

It can therefore be seen that the rotation of the motor casing 14 one way or the other has the effect of causing one of the levers 26 and 27 by its bars 15 or 16. The levers 26 and 27 are therefore actuated respectively when the torque acting on the engine by through the winding tube exceeds a certain value, respectively goes below of another certain value.

Crown 10 has internal toothing 39 driving a pinion 40 formed or fixed at the end a long pinion 41 extending in the cage 13 parallel to the axis of the cage 13 over almost all the length of it. This long pinion 41 meshes with two sliding pinions 42 and 43 moving, during their rotation, like nuts on a screw 44, respectively 45. These screws are immobilized in rotation and have a certain axial freedom, but they are kept at the bottom of a housing 46 in the frame 19 of the cage by a thrust spring 47, respectively 48. The screws 44 and 45 have a end likely to cross the front wall 20. In FIGS. 2 and 4, there are holes 49 in the wall 20 allowing the screw 44 to pass through this wall 20 to push the plate 31. When rotation of the winding tube, the sliding gears 42 and 43 move on their screws and the pinion which comes into abutment against the frame 19 of the cage for effect of axially advancing its carrier screw in direction of the plate 31 by compressing the corresponding spring.

This long pinion and sliding pinion mechanism is well known per se in the field of devices shutter shutter at the end of the stroke, in which the arrival of a sliding pinion in abutment directly or indirectly actuates a switch limit switch. The adjustment of the breakpoint is done by the rotation of the load-bearing screws. Such devices are described, for example, in FR patents 2,599,524, 2,656,463, 2,679,376 and 2,688,022.

As we could understand from the description which precedes the arrival in abutment of the sliding pinion 42 a has the effect of axially displacing the screw 44, which pushes forward the plate 31, which leads to its turn lever 26 so that it then finds opposite the switch 24 of the switch 21. The arrival at the stop of the portable player 42 must be fixed in such a way that at this moment the torque exerted on the winding tube by the roller shutter is lowered (Figure 10) to a value lower than its trigger value, i.e., practically, of such that the roller shutter is relatively close to its upper stop, position in which the torque exerted by the roller shutter deck on the winding tube is weak and in any case fine insufficient to operate lever 26. In this position, as soon as the roller shutter arrives against its high stop, the couple suddenly increases, so so that the casing 14 is able to compress the springs 18. The bar 15 can then actuate the lever 26 which in turn opens the switch 21. The lever 26 which was out of service as long as the pinion player 42 was not in abutment, is therefore set service by the arrival in abutment of this sliding pinion.

The device shown also has the advantage to be able to be mounted, with the motor, both left of a doorway only to the right of it, or in other words, the two switches can be used both for high point stop and for stopping at the lowest point. This advantage is obtained by a construction tip already apparent in Figures 2 to 5, but which will be explained in detail using the figure 6.

The plate 31 has an axial plane of symmetry B confused, in FIG. 6, with the plane of symmetry A of the cage 13. On each side of its plane of symmetry B the tray 31 has, in the upper part of its periphery, two notches 50 and 51, also arranged symmetrically relative to plane B, for example 5 ° on either side of this plane.

The finished device is delivered to installers in the neutral position shown in Figure 6. In this position, all the components visible on the front of the device are arranged symmetrically relative to the plane of symmetry A, i.e. also levers 26 and 27 actuating switches 21 and 22. The plate 31 abuts against the end of the fixed finger 23 which is located between the two notches 50 and 51. The tray 31 thus being held forward, the two levers 26 and 27 of the switches are held in front of the stops 37 and 38. From this position, the installer can obtain a "left" device or "right" by slightly turning the plate 31 to left or right. If the plate 31 is turned to left, finger 23 engages in notch 50 and we obtains the positioning shown in Figures 2 to 5.

In this position, considering the position of rest of bars 15 and 16 as shown in Figure 6, the stroke of the bar 15 necessary for the actuation of lever 26 is enlarged relative to the neutral position, which means that a couple more important must be applied to the winding tube to that the switch 21 is actuated. This couple corresponds to the stop in high stop. Conversely, the lever 27 having moved closer to bar 16, the stroke of this bar 16 necessary for the actuation of switch 22 is shortened, which means that a lower torque is enough to activate the switch 22 which will then be the stop switch at the low point. It will be noted that the switch 22 is actuated in permanently in the absence of torque on the casing 14.

If, taking into account the place where the motor, i.e. also the stop device, it is switch 22 which must function as high point shutdown switch, installer, before commissioning, rotate the plate 31 in the other direction (clockwise on the drawing), so that the finger 23 engages in the notch 51. The lever 27 is then removed from its actuating arm 16 and lever 26 close to its actuating arm 15. During this positioning, the plate 31 is pushed back by its spring 36 against the wall 20 and the lever that went down during this rotation comes in front of its stop 37, respectively 38, and it is retained by this stop, as is the case of lever 27 in Figures 2 to 5.

The position of the device during the power cut on arrival at the top stop is shown in the figure 4.

The cut-off position at the bottom point of the device is shown in Figure 7. Moving the bar 16 in the direction of the arrow, movement which corresponds, for example, to a drop in torque at approximately 10% of maximum torque and on return from housing 14 to its rest position, is enough to tilt the lever 27, kept in service by the stop 38, and at press switch 22. It should be noted that this torque value is practically reached only when all the blades rolled out of the roller shutter are stacked. This couple is therefore weak. Such a torque value can also be reached before complete sequence if the roller shutter encounters a obstacle during its unfolding. The stop device therefore also ensures the shutter stops when encountering a downhill obstacle.

Although this has not been clarified above, it is obvious that it is one or the other of the switches which works as a point switch high, it is one or the other of the sliding pinions 42 or 43 which will be used to determine arrival at proximity of the stop at the high point.

It would of course be possible to waive the possibility of positioning right, left. Likewise, in a simplified execution, the device could include a single screw and a single player, to stop at high point, stop at low point taking place with the scale already described.

Stopping at the low point could also be ensured by a direct action of a second player on the second switch, i.e. without torque intervention exerted on the winding tube.

A second embodiment will now be described in relationship to Figures 8 to 10.

The second mode of execution differs from the first mode of execution by the means of displacement of the plate 31. Components not belonging to these means of displacement are the same in both modes of execution with, sometimes, small differences in form. In order to avoid repetition, common elements of the two modes of execution are designated by the same reference numbers. The the most important differences in form are found in crown 10 which has no teeth at the Figure 8, since it no longer has to train pinion, in the cage 13 which also has a shape adapted to contain the means of movement and in the tray 31 more cut than in the first mode of execution.

FIG. 8 again shows a tear from the cage 13, which, in this second embodiment, is much closer to a complete cylinder. Two of springs 18 opposing the rotation of the casing 14 and the engine clearly appear here. They are housed, with bars 15 and 16 in grooves of the cage 13, as in the first embodiment.

The means of displacement of the plate 31 are constituted here of a cam 60 in the shape of a coat sector cylindrical, the edges of which rest on the bars 15 and 16. A clearance 61, on each side, allows the cam 60 to rotate at an angle around the cage 13. This cam 60 has a set of grooves 62 shown in detail, seen from inside the cage, in Figure 9. Figure 9 is obtained by turning the cam 60 as shown in FIG. 8. The game of grooves 62 has symmetry with respect to plane A of Figure 6. The grooves of the groove set 62 are partly through and partly not through. There is a central part 620 in an arc centered on the axis of rotation of the cam 60 and crossing the thickness of his coat. This part central 620 is extended on each side by branches 621 and 622 not traversing and connected to the central part by strong ramps 623 and 624. A from the ends of the central part 620, extend two approximately helical grooves 625 and 626 traversing constituting the active parts of the cam and ending in two short sections 627 and 628 parallel to the central section 620. The top of ramps 623 and 624 coincides with the grooves 625 and 626. In this set of grooves 62 is engaged a finger 63 extending radially in the cage 13 and mounted on a spring 64 housed in a moving part 65, between a flange 66 carrying the finger 63 and the bottom of the housing. Penetration of finger 63 into the coat of cam 60 is such that its end abuts against ramps 623 and 624 so that slide on these ramps. The axially movable part 65 leans, on the opposite side to the plate 31, against a shock absorber 67, for example a shock absorber of the type hydraulic shock absorber for vehicle suspension. Of side of the plate 31, the piece 65 ends with a finger thrust 68 which crosses the front wall 20 of the cage to push the plate 31.

The operation of this second embodiment will be better understood if we refer to Figure 10 which represents the variation of the torque applied to the flap rolling during its winding. The couple is represented on the ordinate, while the height of the roller shutter deck remaining to be rolled up represented on the abscissa, the origin corresponding to the completely unrolled position.

Starting from the unrolled position, we see that the torque increases to a maximum value M. This part of the curve corresponds to progressive destacking shutter blades. The maximum corresponds to the position of the unrolled and suspended deck. Then, as and as the deck rolls up, the torque decreases up to a minimum corresponding to the position fully rolled up, but before the final blade of the rolling shutter comes into abutment against the box. When the final blade comes to a stop, a pull is exerted by the motor on the rolling shutter of such so that the torque increases sharply. Ways shown in Figures 8 and 9 take advantage of this difference of the slopes of the represented curve, like this will be described.

In the position shown in Figure 8, the tray 31 is positioned on the left as in Figure 2 and the device is in rest position, for example in fully extended position of the roller shutter corresponding to the origin of the curve shown in figure 10. In the first ascending part of the curve, when the torque is sufficient to drive cam 60, the torque gradually increases and the cam 60 rotates relatively slowly in the direction of arrow F. When finger 63 reaches the end of section 620, it stumbles simultaneously against the ramp 624 and against the helical section 626, but the resistance of the ramp 624 being greater than the shock absorber resistance, finger 63 follows the helical section and drives the work back mobile 65. The plate 31 can then be pushed back in rear by its spring 36 and, as in the first mode of execution, lever 26 moves back with the plate 31 thus coming into its out-of-service position. The section 628 allows rotation of cam 60 and casing 14. When after reaching its value maximum M, the torque decreases again until it minimum value, cam 60 returns to its position initial and the finger returns to the central part 620 of the through groove. When the final blade of the roller shutter comes into high stop, the cam 60 suddenly turns under the effect of the increase abrupt couple. The inertia of the shock absorber 67 prevents part 65 from moving back and the finger is sees forced to slide on ramp 624, backing up axially, to enter the groove 622. The platform 31 therefore remains in its advanced position, the lever 26 remains in service and operates the switch 21.

If the plate 31 is positioned in the other direction by the engagement of finger 23 in its notch 51, the same process takes place in sections 625 and 621 of set of grooves.

This embodiment also has the advantage of allow detection of a blockage of the roller shutter by mounted in the first part of its winding, both that finger 63 has the possibility of passing over ramp 624, respectively 623, following a sudden increase in torque. Indeed, the shock absorber 67 will then react in the same way as when the rolling shutter comes into high stop.

In addition, the operation of the device is independent of the path traveled by the roller shutter and therefore independent of the length of the roller shutter.

When lowering, the low stop switch is in permanently active as in the first execution mode and for the same reasons.

Shock absorber 67 could be replaced by any inertial device, for example a locking brake during a sudden action.

Another way to disable switches consists in locking the actuation levers of the switches. This locking can be controlled, by example, by means similar to those used in the first mode or in the second mode of execution.

Figure 11 is a view similar to that of Figure 2 showing a locking device derived from first mode of execution. In order to avoid repetition unnecessary, the elements included as is or with insignificant form changes in Figure 1, are designated by the same reference numbers.

The cage 13 of FIG. 11 does not differ from the cage of the Figure 2 only by the orientation of the screws 44 and 45 and the position of springs 47 and 48 opposing the axial displacement of these screws. The screws 44 and 45 are 180 ° reversed from their position shown in Figure 2, so that the sliding pinions 42 and 43 move in opposite directions of the first mode of execution for the same sense of rotation of the long pinion 41. In FIG. 11, when the sliding pinions 42 and 43 are not in abutment, the screws 44 and 45 bear against the front wall 20 under the thrust of their springs 47 and 48. The screws 44 and 45 are extended, through the front wall 20, by a locking finger 71, respectively 72 terminated by an axial flat. Therefore, when, by example, the pinion 42 abuts against the wall 20, the screw 44 moves in the direction of the support 12 in compressing its spring 47. This displacement causes a retraction of the locking finger 71.

The plate 31 being positioned on the left, of the same so that in figure 2, it's again the right switch 21 which is the switch high stop. The switches are actuated by levers 73 and 74 which can flex elastically. If we consider lever 73, it consists of two arms 730 and 731 kept in the separated position one of the other by a spring 732 working in compression.

The lever 74 is kept out of the path of the locking finger 72 by the stop 38, such so it's still active, like in the first mode of execution. Figure 11 shows the device at rest, casing 14 not subjected to torsional stress. The switch 22 is therefore actuated by its lever 74.

In the position shown in Figure 11, the pinion player 42 is in an intermediate position and the locking finger 71 retains the arm of the lever 731. Therefore, when the torque exceeds its value of trigger, for example if it reaches the value M (Figure 10), the spring 732 absorbs the pivoting of the arm 730 and the switch 21 is not actuated.

When the sliding pinion 42 abuts against 20, the finger 71 is retracted and releases the arm 731. When the torque increases again, the lever 73 can then activate the switch 21 under the pressure of the bar 15. The left lever 74 is identical and works the same way.

Claims (13)

Automatic engine stop device tubular electric driving a winding tube (2) a rolling shutter or the like (1) abutting in the high rolled up position, comprising a device for trigger reacting to the torque exerted on the housing (14) of the motor by the winding shaft so as to interrupt the motor supply during a increased torque due to arrival of the flap rolling in high position, characterized in that the device includes a single switch (21 or 22) operating at the winding and mechanical means (31, 41 to 45; 31, 60 to 67; 41 to 45, 71, 72) deactivation service of the switch operating the winding, less during the winding phase during which the torque exerted on the winding tube is greater than the tripping torque. Device according to claim 1, characterized in what the mechanical means of decommissioning the switch operating at the winding are made up a mechanism (31, 41 to 45) kinematically linked to the winding shaft (2) and now out of service the switch operating at the winding for as long that the torque exerted on the winding tube is not lowered to a value lower than its value of trigger. Device according to claim 2, characterized in what it includes a cage (13) fixed in rotation housed in the winding tube and containing a long pinion (41) with an axis parallel to the axis of the winding tube and driven by the winding tube (2), at least one screws (44, 45) with an axis parallel to the long pinion and bearing a sliding nut (42, 43) provided with teeth peripheral meshing with the long pinion (41), said screw being axially displaceable against a spring (47, 48) and moved when the the sliding nut in abutment, the axial displacement of the screws having the effect of putting into service the switch operating at the winding. Device according to claim 3, characterized in that it includes a lever (26, 27) for actuation of the switch (21, 22), a bar of control (15, 16) of said lever integral in rotation with the motor housing (14), and calibrated springs (18) opposing the rotation of said housing relative to the cage. Device according to claim 4, characterized in that the lever (26 or 27) actuating the switch operating at the winding (21 or 22) is mounted tilting and sliding on an axis and pushed axially by a spring (34, 35) tending to keep it in a out of service position in which it does not meet the switch during its tilting, the displacement axial of said screw (44 or 45) having the effect bring said lever in front of the switch to its actuation. Device according to claim 4, characterized in that the lever (73 or 74) actuating the switch rise is flexible and locked at rest by a locking finger (71 or 72) actuated by said screw (44 or 45), the axial displacement of the screw having to release said lever for actuation up switch. Device according to claim 1, characterized in what the means of decommissioning of the switch operating at the winding (21 or 22) are consisting of a cam (60) and inertia (67) mechanism able to distinguish between an increase progressive and a sudden increase in torque, so as to deactivate the switch operating at winding only when the increase in couple is progressive. Device according to claim 7, characterized in what the means of decommissioning of the switch operating on ascent include a cam cylindrical (60) linked to the motor housing (14) and having a set of shaped grooves (62) switch having a first part (620) in arc of a circle centered on the axis of the cam followed by a branch consisting of a first branch (621, 622) extending the rectilinear part, but the depth is less than that of the first part and connected to this first part by a ramp (623, 624) and a second branch (625, 626) of form approximately helical, a movable part (65) axially and provided with a drive finger (63) resiliently mounted (64) radially and cooperating with the cam and a damper (67) opposing the axial movement of said movable part (65), the whole so that a gradual increase in the torque has the effect of engaging the finger (63) in the helical branch and move the moving part, while during a sudden increase in torque, the finger (63), prevented from engaging in the branch helical, due to the inertia of the shock absorber which retains the moving part (65), continues on its way in said branch (625, 626) passing over said ramp, so that a sudden increase in torque is detected on arrival at the stop. Device according to one of claims 5 to 8, for left or right mounting, characterized in that includes a pair of switches (21, 22) and a pair of mounted actuation levers (26, 27) symmetrically relative to the axis of the cage cylindrical, on axes (32, 33) integral with a plate (31) rotatably mounted around an axis (30) confused with the axis of the cage and having a plane of symmetry (B) passing through said axis (30) and angularly positionable, so that the plane symmetry (B) can be tilted either to the right, either to the left relative to the plane of symmetry (A) of the cylindrical cage, locking means (23, 50, 51) of the plate (31) in the angular position chosen, said bars (15, 16) being symmetrical and the springs (18) also. Device according to claim 9, characterized in that said plate (31) is also mobile axially against the action of a spring (36). Device according to claim 1, characterized in what it includes a second switch (22 or 21) operating in the process and activated when the couple exerted on the motor housing drops below a determined value. Device according to claims 9 and 11, characterized in that one of the switches (21, 22) operates during the unwinding, the inclination given to the position of the plate relative to the plane of symmetry (A) of the cage differentiating the couples necessary for actuation of the switches, the most torque large corresponding to the stop in high stop. Device according to claim 12, characterized in that the cage (13) has protuberances (37, 38) constituting axial stops for said levers (26, 27), the asymmetrical positioning of the plate (31) having the effect that the switch lever of the operating stop (for example 27) is in stop against a protuberance (for example 38), so that it is kept away from the tray and face of its switch, while the lever the switch operating at the winding (for example 26) is next to the corresponding protuberance and that it is therefore axially next to its switch, i.e. out of service, as long as it is not pushed by the plate (31) for its setting service.

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