JPH10184250A - Automatic stop device for roller blind, etc. - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust the release threshold of a stop device by movably installing a switch for a permanent change between the switch and a work arm at the place of stop. SOLUTION: The automatic stop device consists of a releasing device interrupting power supply to a motor in response to torque applied to a housing for the motor by a hoisting shaft when torque is increased by the reaching of the roller blind to the place of elevation. The housing is mounted so as to be rotated and driven to the motion of elastic means 3, 14 when torque applied to the housing by a hoisting shaft exceeds fixed threshold, and fixed kinematically to a work arm 7 for carrying out the operation of at least one switch 21 or 22. The switches 21, 22 are mounted movably for permanently altering distances among the switches 21, 22 and the work arm 7 at the places of stop, and the release threshold of the stop device is adjusted easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic stopping device for a tubular electric motor for driving a hoisting pipe such as a roller blind which reaches a stop limit at a hoisting position. The electric motor housing comprises a release device that cuts off the power supply to the electric motor in response to the torque applied to the electric motor housing by the hoisting shaft. The electric motor housing has a constant threshold applied to the electric motor housing by the hoisting shaft. At least 1 if
It is kinematically fixed to an actuation arm for actuating the two switches and is mounted to rotate in response to the action of the elastic means.

[0002] The term motor means the entirety of an electric motor.

[0003]

2. Description of the Related Art Such an apparatus is disclosed in EP Patent Application No. 0703.
No. 344. In this device, the motor is fixed by two arms, each arm carried on a spring and actuating a switch. When the roller blind reaches the upper limit stop position, the motor is rotationally driven for one movement of the spring and activates one of the switches. The other switch is used to cut off power to the motor, even when the roller blind encounters an obstruction during its unwinding and acts to drive the motor in the opposite direction. The stop of the roller blind in the full unwind position is ensured by a special switch controlled by a mechanism that measures the movement of the roller blind. At rest, the movement of the arm is very small since the arm contacts the push button switch. Adjusting the pre-compression of the spring is very difficult. This makes it difficult for the springs to interact, thereby adjusting the torque required for actuation of the switch, especially for the switch which is activated when the roller blind reaches the upper limit stop position. These means
Furthermore, it is used not only alone but also in combination with the movement measurement mechanism of the roller blind. This mechanism neutralizes the operation of the switch acting on the winding before the roller blind reaches the area near the complete winding position by means of the switch. The shunt of the switch, controlled by the device for measuring the end of travel of the roller blind, takes into account the torque exerted on the motor by the winding of the roller blind only in the final stages of winding.

[0004]

The prior French Patent No. 9
SUMMARY OF THE INVENTION With reference to the concept described in U.S. Pat. No. 6,142,202, it is an object of the present invention to provide a stopping device which can be adjusted more easily in response to the torque applied on the motor by means of a roller blind.

[0005]

According to the present invention, there is provided an automatic stop device for a tubular electric motor for driving a hoisting pipe such as a roller blind which reaches a stop limit at a hoisting-up position according to the present invention. A lifting device that responds to the torque applied to the motor housing by the hoist shaft when the torque increases due to the arrival of the roller blinds and shuts off power supply to the motor, the housing being added to the housing by the hoist shaft; Mounted to be rotationally driven by movement of a resilient means such as a spring when the torque exceeds a certain threshold, and kinematically fixed to an actuation arm to enable actuation of at least one switch; In the rest position, the switch or the operating arm is Characterized in that it is provided movably for permanently changed between Ji and said actuating arm.

[0006] With this arrangement, the adjustment of the release point can be achieved not by adjusting the spring as in the prior art, but simply by adjusting the distance between the switch and the operating arm that operates the switch. According to another aspect of the invention, to allow installation on either the left or right side,
A second switch is employed, and the switches are respectively installed on both sides of the arm. The second switch is activated when the torque applied to the motor drops below a predetermined value, and stops the motor when the roller blind is completely unwound.

Preferably, the two switches are symmetrically provided with respect to the arm when the motor is in a no-torque state. The torque required to stop the roller blind at the upper stop position is generally substantially greater than the torque required to stop the roller blind at the lower stop position. This requires the introduction of asymmetry. This asymmetry can be introduced by movement of the switches, for example by rotation or translation of the support carrying the two switches, or by movement of the actuation arm.

[0008] The two switches can be fixed, for example, on a disk which can be moved angularly, and the disk may be locked in a selected asymmetric position by locking means. In order to enable installation on either the left or right side, the automatic stop device includes a disk that is rotatably mounted around a spindle coaxial with the rotation axis of the operating arm and has an axisymmetric surface, wherein the disk is Means for carrying a pair of switches symmetrically arranged in the axis-symmetric plane, and for angularly moving the disk in both left and right directions, and means for positioning the disk at a selected angular position, Preferably, the distance between the pair of switches and the operating arm is changed.

The switch may be mounted on a support that moves across the actuation arm. Further, the switch is fixed, and the operating arm has an auxiliary piece for operating the switch, and the auxiliary piece crosses the arm to change a distance between each switch and the auxiliary piece. And may be fixed to two stable positions on the arm.

The auxiliary piece comprises a small plate having a straight elongated hole forming an enlarged portion at both ends, and the operating arm extends in the direction of the arm and passes through the elongated hole of the small plate. A pillar having a cross section greater than the remainder of the pillar and having a base passing through the enlarged portion, wherein the pillar passes through a slot in the small plate between the enlarged portions. Biasing the small plate under the action of a spring mounted around the column between the small plate and the head of the column, so that the small plate is brought into its intermediate region on the base of the column. From the carried position, the small plate moves across the column and along the column under the thrust of the spring when one of the enlarged portions of the slot opposes the base of the column. The plate moves It may be.

In this case, the switch is located outside the trajectory of the small plate when the intermediate portion of the small plate urges the base of the column, and the device is configured to move the arm on the trajectory of the small plate. Said motor, comprising two limit stops arranged on both sides, said motor being driven first in a direction corresponding to the winding of the roller blind and responsive to its torque when the roller blind reaches the abutment position The drive of the housing moves the small plate to one of the limit stops, and the limit stop pushes the small plate back to allow movement along the post, so that the switch is turned when the actuation arm rotates. It may be configured to be positioned on the track of the small plate.

According to a specific embodiment of the present invention, a cylindrical cage fixed in the hoisting tube, and a cylindrical cage fixed in the housing to enable installation on either the left or right side.
Two control rods, a calibration spring that resists rotation of the housing relative to the cage, a pair of switches and a pair of actuation arms in the form of levers symmetrically mounted with respect to the axis of the cage, and the selected angular position. Comprising means for locking a disk, wherein the switch and the actuating arm are rotatably mounted about an axis fused to the axis of the cage, have a plane of symmetry passing through the axis and form an angular position. From the configuration, the plane of symmetry of the disc is inclined to the left or right with respect to the plane of symmetry of the cage. The control rod and the spring are symmetrically disposed on an axially symmetric plane of the cage.
The disk is movable in the axial direction by a spring action. One of the switches is activated during unwinding and the torque required to activate the switch changes when the disc is in the asymmetric position, with a maximum torque corresponding to a stop at the upper stop position.

Such a driving device can be installed on either the left or right side of the window opening. In order to wind up the roller blind, the motor can be rotated in one direction or another direction depending on the installation position. . The support, specifically the rotating disc, is moved in one direction or the other so that the switch that activates when the roller blind reaches the upper stop position is the switch that is farther from the activation arm connected to its motor. It is a moving configuration.

The motor stopping means can be used in any case where the nominal torque utilized for automation of the roller blind is reasonable. The motor housing is preferably rotated by two identical, opposed, factory-calibrated springs.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an automatic stop device according to an embodiment of the present invention.
The basic principle of the automatic stopping device according to the present invention is shown in FIG. The housing of the motor, not shown, is fixed to a support 1 rotating about an axis a and
Two opposing springs 3 acting on one arm 5 and 6
And 4 keep the rotation. The support 1 has two switches 21 and 22 respectively located at a distance C1 and C2 from the finger 7. When torque is applied on the housing of the motor by the hoisting tube of the roller blind, which is itself held by the roller blind reaching the limit stop position, the support 1 pivots,
The finger 7 operates one of the switches 21 and 22 according to the rotation direction of the housing of the motor. The idea of the invention is to change the distance between C1 and C2 as a function of the torque used to stop the motor. The use of the two switches 21 and 22 not only allows installation on either the left or right side of the motor window opening, but also, depending on the type of roller blind, the roller blind is completely unwound and the hoisting tube Ensures that the roller blind stops when a lower limit stop position is reached which suddenly reduces the torque exerted by the roller blind on the motor. When stopped at the upper limit stop position, the torque required to stop the motor is relatively large, so the distance of C1 or C2 is adjusted, and the stop at the lower limit stop position generally reduces the torque slightly. , The distance C1 or C2 is selected to be relatively short.

FIG. 2 is a diagram showing a first method of changing C1 and C2. In this way, the two switches 21 and 22 are fixed on a common support 8 in the form of a traverse that moves in a direction transverse to the fingers 77, as indicated by the two arrows. In this way, the distance between the two switches themselves is fixed, so that an increase in C1 corresponds to a corresponding decrease in C2. This is generally tolerated by stopping devices for roller blinds.

FIG. 3 shows another embodiment of the method of FIG. 2, in which switches 21 and 22 are mounted on a disk mounted for rotation about axis a. FIG. 4 shows an embodiment of the stopping device according to the invention, which is the device shown in FIG. 2 of French Patent No. 96 14202. In this configuration, all components of the device according to French Patent No. 96 14202 are shown for detecting excessive torque in the motor housing. The illustrated automatic stopping device is likewise installed in the particularly illustrated winding tube 2, a part of which is shown. At the end of the hoisting tube 2 a collar 10 is fixed internally and the smooth part of the collar 10 acts as an end bearing of the hoisting tube and forms part of a support 12 which is fixed to a flank of a case, not shown. And an electrical connector carried on the cylindrical support 11 and connected to a power supply for motor control. A cylindrical cage 13 is fixed to the support 12 inside the extension of the cylindrical housing 14 of the motor.
Is held elastically. For this purpose, the housing 14 has two longitudinal bars 15 and 16 fixed to the inner wall of the housing 14 by screws 17 and housed in the grooves of the cage 13 as control bars. These sticks 15
And 16 and the groove are formed parallel to and symmetric with respect to the common axis of the winding tube 2 and the housing 14. The housing 14 is numbered around the cage 13 by four sets of V-shaped springs 18 located between each bar 15 and 16 and the cage 13, each bar being held between two sets of springs. Spring retention is calibrated by one or both springs.

The other end of the cage 13 terminates in a front wall 20. On this wall 20, two switches 21 and 22 are fixed, the switches 21 and 22 being planes containing the axis of the whole unit, passing through the center of a finger 23 extending forward of the edge of the front wall 20. Are arranged symmetrically and in parallel. The switches 21 and 22 comprise push buttons 24 and 25 respectively operated by lever-shaped operating arms 26 and 27 each having two arms. Two connection terminals 28 and 29 are shown in FIG. 4 for making electrical connections to respective switches of a motor, not shown, which are installed in the extension of the illustrated stop device.

The front wall 20 has switches 21 and 22 at its center.
It is equipped with a spindle 30 with a head that fuses with the geometric axis of the cage 13 extending between them. This spindle 3
The disk 31 is articulated about 0 and spreads in a substantially semicircular shape to form an axisymmetric plane. This disc 31 carries levers 26 and 27 mounted for pivoting on rods 32 and 33. Helical coil springs 34 and 35 are mounted around these rods,
In particular, the levers 26 and 27 are held at a fixed distance from the push buttons 24 and 25 of the switch by their torsional and compressive forces. Similarly, the disc 3 against the front wall 20
A spring 36 holding one is mounted around the spindle 30.

As will be appreciated, the motor housing 1
The rotation of the four in one direction or in the opposite direction is linked to one of the levers 26 and 27 by the rods 15 and 16. The levers 26 and 27 thus actuate, respectively, when the torque exerted on the motor by the hoisting tube exceeds a certain value and falls below another certain value. Disk 31
Has an axisymmetric plane, has two notches 50 and 51 symmetrically arranged at an angle of, for example, 5 ° with respect to the axisymmetric plane, and has two arms 53 and 54 axisymmetrically. ,
Their ends lie on the tracks of rods 15 and 16, respectively.

The finished device is transported to the assembler in a neutral position where the disk 31 abuts the end of the finger 23 by a portion 52 separating the notches 50 and 51.
In this neutral position, levers 26 and 27 are positioned at the same distance from switches 21 and 22. From this position it is possible for the assembler to form a "left hand" or "right hand" device by a slight left or right rotation of the disc 31. When the disc 31 rotates to the left, the fingers 23 are notched 5 as shown in FIG.
0, and the disc 31 is pushed back by the spring 36. In this position, the rod 15 is raised and moved to the neutral position in order to activate the lever 26, which means that greater torque must be applied to the hoisting tube in order to activate the switch 21. This torque enables the stop at the upper limit stop position. On the other hand, the lever 27 is moving toward the bar 16, and the movement of the bar 16 required for the operation of the switch 22 is shortened. This means that a relatively small torque is sufficient to operate the switch 22, and the switch 22 may be a lower stop switch. The switch 22 operates permanently on the housing 14 with no torque applied.

Regarding the location of the motor, similar to the stop device, the switch 22 functions as an upper limit stop switch, and the assembler rotates the disk 31 in the opposite direction before operation.
As a result, the finger 23 is locked in the notch 51. The positioning of the disc 31 can also be performed automatically by the interlocking of one of the arms 53 or 54 of the disc 31 with the longitudinal bars 15 and 16 depending on the rotation direction of the motor corresponding to the winding when the installation is first performed. .

Thus, in the position shown in FIG. 4, when the unwind roller blind reaches the lower limit stop position, the longitudinal bar 16 near the lever 27 controls the stop of the motor. In this case, movement of the longitudinal bar 16 corresponds, for example, to a torque reduction of about 10% of the maximum torque and returns the housing 14 to the rest position. This movement is sufficient to swing lever 27 and actuate switch 22. This torque value is reached virtually only when all of the unwinding platelets of the roller blind are stacked. Therefore, this torque is small. Similarly, if the roller blind encounters an obstacle during unwinding, the torque value will be applied before unwinding is completed. Thus, this stopping device stops the roller blind if an obstacle is encountered when the roller blind descends.

FIGS. 5 and 6 show another means for improving the distance of the symmetrical position between the actuation arm and the pair of switches 21 and 22. FIG. The support 1 is installed so as to rotate about an axis a having an arm 7. In the neutral position,
Arm 7 is equidistant from switches 21 and 22.
The arm 7 has at one end a cylindrical column 6 extending to the axis of the arm 7.
1 has a cover 60 attached to its center. The lower end of the rod or column 61 (on the drawing) has a diameter greater than the diameter of the column 61 and has a base 62 connected to the column by a truncated cone. The outer end of the column 61 has a head 63. A small plate 64 is installed in the cover 60 across the arm 7. The small plate 64 has a linear elongated hole 65, and the column 61 passes through the elongated hole. Long hole 65
Extend at each end thereof to form enlarged portions 66 and 67, and the diameter of the elongated hole 65 is slightly larger than the diameter of the base 62 of the column 61. When installing in a factory, small plates 64
Extend symmetrically on both sides of the arm 7 and are carried on the upper end of the frustoconical part of the base 62 of the column 61 under the thrust of a spring 68 which makes a compression movement between the head 63 and the small plate 64 .

In this position of the small plate 64, limit stops 69 and 7 are provided on both sides of the arm 7, respectively.
0 is provided. Switches 21 and 22 are mounted at a lower level in the drawing. In the neutral position of FIG. 5, the small plate 64 is equidistant from the switches 21 and 22 when descending along the axis of the arm 7.

When installing the roller blind, the assembler first controls the winding of the roller blind.
When the roller blind reaches the upper limit stop position with respect to the case, the motor housing is driven to rotate. This rotation is clockwise in FIG. Small plate 64
Immediately abuts the limit stopper 69, which may be very close to the small plate 64. Limit stopper 69
May be a limit stopper 70. The small plate 64 receives the thrust in this manner and receives the arm 7.
Charge to the left. When the enlarged portion 66 of the small plate reaches and opposes the base 62 of the column 61, the small plate 64
Is pushed into this base by the spring 68 and the switch 2
Occupies levels 1 and 22. When the arm 7 returns to the neutral position, the distance C1 between the small plate 64 and the switch 21 becomes substantially larger than the distance between the small plate 64 and the switch 22, as shown. Thus, the torque required to operate switch 21 is substantially greater than the torque required to operate switch 22. In this way, the switch 21 reliably stops the motor at the upper limit stop position, while the switch 22 reliably stops the motor at the lower limit stop position. Thus, the automatic positioning to the asymmetry takes place during the first winding of the roller blind.

The arm 7 can be indirectly driven by a motor, for example, by gear up or gear down. The linkage is kinematically sufficient.

[Brief description of the drawings]

FIG. 1 is a diagram showing the basic principle of an automatic stop device according to the present invention.

FIG. 2 is a diagram illustrating a first method of changing a distance between an actuation arm and two switches.

FIG. 3 is a diagram showing a second method of changing a distance between an operation arm and a pair of switches.

FIG. 4 is a perspective view showing a first embodiment of the present invention.

FIG. 5 is a diagram showing a part of a second embodiment using a third method of changing a distance between an operating arm and a pair of switches.

6 shows the device according to FIG. 5 after changing the distance between the actuation arm and the pair of switches.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 ... Support 2 ... Hoisting tube 3, 4 ... Spring 5, 6 ... Arm 7 ... Finger (operating arm) 14 ... Motor housing 21, 22 ... Switch 26, 27 ... Lever (operating arm) 31 ... Disk 61 ... Pillar 64 ... Small plate 65,66 ... Long hole 69,70 ... Limit stopper

Claims (11)

[Claims] 1. An automatic stop device for a tubular electric motor for driving a hoisting pipe (2) such as a roller blind reaching a stop limit at a hoisting-up position, wherein said automatic stop device moves the roller blind to said up position. A release device that shuts off power supply to the motor in response to torque applied to the motor housing (14) by the hoisting shaft when the torque increases upon reaching;
The housing is mounted so as to rotate in response to the movement of the resilient means (3, 4; 18) when the torque applied to the housing by the hoisting shaft exceeds a certain threshold, and at least one switch (2).
To enable the actuation of the actuation arms (7,
26, 27) kinematically fixed to said switch (2, 22) or said actuation arm (7; 26, 27)
Is movably installed in the rest position to permanently change the distance between the switch and the operating arm. 2. The automatic stopping device according to claim 1, wherein said switches are installed on both sides of said arm so as to enable installation on either side. . 3. The automatic stop device according to claim 2, wherein the two switches are symmetrically provided with respect to the arm when the motor is in a no-load state. 4. An axially symmetric surface which is rotatably mounted on a spindle (30) coaxial with a rotation axis (a) of said operating arm (7) so as to be installed on either the left or right side. And a pair of switches (2) symmetrically arranged on the axis of symmetry.
1, 22) and means for angularly moving the disk in both the left and right directions, and means for positioning the disk at a selected angular position, thereby providing a position between the pair of switches and the operating arm. 4. The automatic stopping device according to claim 3, wherein the distance of the automatic stop changes. 5. The automatic stop according to claim 3, wherein the switches (21, 22) are mounted on a support (8) that moves across the arm (7). 6. The switch (21, 22) is fixed, and the arm (7) has an auxiliary piece (64) for operating the switch, and the auxiliary piece is connected to each of the switches. The arm is movable in a direction transverse to the arm to allow a change in the distance between
4. The automatic stopping device according to claim 3, wherein the automatic stopping device can be fixed to one of two stable positions. 7. The auxiliary piece comprises a small plate having a linear elongated hole (65) forming an enlarged portion (66, 67) widened at both ends, and the arm (7) is moved in the direction of the arm. A pillar (6) extending and passing through a long hole of the small plate
1) wherein said post has a larger cross-section than the remainder of said post and has a base (62) passing through said enlarged portion (66, 67), said post being a slot in said small plate (6
5) biasing the small plate under the action of a spring (68) compression fitted around the column between the small plate and the column head (63) as it passes between the enlarged portions; , Whereby the small plate is connected to the base (6
2) from the position carried on its intermediate area above, the small plate moves across the column and the spring is moved when one of the enlarged portions of the slot faces the base (62) of the column; 7. The automatic stopping device according to claim 6, wherein the small plate moves along the column under the thrust of (68). 8. The switch (21, 22) is located outside the track of the small plate (64) when the middle portion of the small plate (64) biases the base (62) of the column, And two limit stops (69, 70) arranged on both sides of the arm on the track of the small plate, the motor being driven first in a direction corresponding to the winding of the roller blind and the roller blind being applied. When the contact position is reached, the small plate is conveyed to one of the limit stoppers (69, 70) by driving the motor housing by the resistance torque, and the limit stopper pushes the small plate back to the column. 8. The automatic of claim 7, wherein the switch is positioned on the trajectory of the small plate upon rotation of the actuation arm. Stop device. 9. To enable installation on either the left or right side, the device comprises a cylindrical cage (13) fixedly housed in a hoisting tube (2), and two control rods fixed to the housing. (15, 16), a calibration spring (18) for resisting relative rotation between the cage and the housing, and a shaft (30) mounted rotatably about an axis (30) coinciding with the axis of the cage. Disk having a plane of symmetry (3)
1) a shaft fixed to the disc (3), which enables angular positioning such that the axis of symmetry of the disc is inclined to the left or right with respect to the axis of symmetry of the cage;
2,33), a lever-shaped actuating arm (26,27) and a pair of switches (21,22) symmetrically mounted on the axis of the cage, and locking the disc at selected angular positions. Means (23, 50, 51), said control rod (15, 16) and said spring (18)
The automatic stopping device according to claim 1, wherein は is installed symmetrically on an axially symmetric plane of the cage. 10. The disk (31) comprises a spring (36).
10. The automatic stop device according to claim 9, wherein the automatic stop device is movable in the axial direction with respect to the movement of the automatic stop. 11. One of the switches (21, 22) operates at the time of unwinding, changes the torque required for the operation of both switches by asymmetrically positioning the disk, and stops the upper limit by the maximum torque. 11. The automatic stopping device according to claim 10, wherein the stopping at a position is enabled.