JP4220002B2 - Automatic stop devices such as roller blinds - Google Patents

Abstract

The mechanism comprises a release mechanism which responds to the coupling exerted on the casing of the motor by a tube which is being driven by the motor. The casing is mounted to rotate, turning against the action of an elastic device (3,4). The casing is mechanically linked to an operating arm (7) in order to operate one of two switches (21,22) according to the direction in which the arm is tilted. The switches and the arm are mounted so that their relative positions can be permanently adjusted to achieve the required settings for the stop mechanism. In the absence of any coupling on the motor, the arm is placed symmetrically between the two switches.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic stop device for a tubular electric motor that drives a winding pipe such as a roller blind that reaches a stop limit at a winding position, and relates to an electric motor driven by a winding shaft when torque increases when the roller blind reaches the rising position. A release device that cuts off the power supply to the electric motor in response to torque applied on the housing, wherein the electric motor housing is at least one when the torque applied on the electric motor housing by the hoisting shaft exceeds a certain threshold It is kinematically fixed to the actuating arm for actuating the switch and is arranged to be rotationally driven against the action of the elastic means.
[0002]
The term motor means the entire electric motor.
[0003]
[Prior art]
Such a device is known from EP Patent Application No. 0703344. In this device, the motor is fixed by two arms, each arm being 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 its spring and actuates one of the switches. The other switch is used to cut off the power supply to the motor even when the roller blind encounters an obstacle when unwinding and acts to drive the motor in the opposite direction. The stop of the roller blind to the fully unwound position is ensured by a special switch controlled by a mechanism that measures the movement of the roller blind. At rest, the arm contacts the push button switch, so the movement of the arm is very small. Adjustment of the pre-compression of the spring is very difficult. This makes it difficult to adjust the torque necessary for the operation of the switch by the interaction of the springs, in particular to adjust the torque of the switch that operates when the roller blind reaches the upper limit stop position. These means are not only used alone, but also in combination with a roller blind movement measurement mechanism. This mechanism neutralizes the operation of the switch acting on winding before the roller blind reaches the region near the complete winding position. The switch shunt controlled by the device measuring the end of travel of the roller blind takes into account the torque applied to the motor by the roller blind winding only in the final stage of winding.
[0004]
[Problems to be solved by the invention]
Referring to the concept described in the previous French Patent No. 96 14202, it is an object of the present invention to provide a stop device that can be adjusted more easily than a roller blind that responds to the torque applied on the motor.
[0005]
[Means for Solving the Problems]
In the automatic stopping device for a tubular electric motor that drives a winding pipe such as a roller blind that reaches the stop limit at the winding ascending position according to the present invention for solving the above-described problem, the torque increases when the roller blind reaches the ascending position. A release device that cuts off power supply to the motor in response to torque applied to the motor housing by a hoisting shaft, the housing when the torque applied to the housing by the hoisting shaft exceeds a certain threshold Installed to be rotationally driven against the movement of a resilient means such as a spring and kinematically fixed to an actuating arm to allow actuation of at least one switch, said switch or said actuating arm being at rest In position, between the switch and the actuating arm Characterized in that it is provided movably for to Hisashi changed.
[0006]
With this configuration, the release point can be adjusted 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 present invention, a second switch is employed to enable installation on either the left or right side, and the switch is installed on each side of the arm. The second switch is activated when the torque applied to the motor falls below a predetermined value, and stops the motor when the roller blind is completely unwound.
[0007]
It is preferable that the two switches are installed symmetrically with respect to the arm when the motor is not loaded with torque. The torque required to stop the roller blind at the upper limit stop position is generally substantially larger than the torque required to stop the roller blind at the lower limit stop position. Therefore, it is necessary to introduce asymmetry. This asymmetry can be introduced by movement of the switch, for example by rotation or translation of the support carrying the two switches, or movement of the actuating arm.
[0008]
The two switches can be fixed, for example, on a disk that can be angularly moved, and the disk may be fixed to a selected asymmetric position by a locking means.
In order to enable installation on either the left or right side, the automatic stop device includes a disk that is rotatably installed around a spindle coaxial with the rotation axis of the operating arm and has an axisymmetric surface, Means for carrying a pair of switches symmetrically arranged on the axisymmetric plane and for angularly moving the disk in both the left and right directions, and means for positioning the disk at a selected angular position, thereby Preferably, the distance between the pair of switches and the operating arm is changed.
[0009]
The switch may be installed on a support that moves across the actuating arm. 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 the distance between each switch and the auxiliary piece. And can be fixed to two stable positions on the arm.
[0010]
The auxiliary piece is composed of a small plate having a linear long hole that forms an enlarged portion extending at both ends, and the operating arm has a column extending in the direction of the arm and passing through the long hole of the small plate. And the column has a base larger than the remainder of the column and has a base that passes through the enlarged portion, and the column is small when the column passes through a slot in the small plate between the enlarged portions. The small plate is biased under the action of a spring compression mounted around the column between the plate and the head of the column, so that the small plate is carried on the base of the column in its middle region From position, when the small plate moves across the column, the small plate moves along the column under the spring thrust when one of the enlarged portions of the slot faces the base of the column It may be the composition to do.
[0011]
In this case, the switch is located outside the path of the small plate when the middle part of the small plate biases the base of the column, and the device is on both sides of the arm on the path of the small plate. Two limit stoppers disposed, wherein the motor is first driven in a direction corresponding to the rolling up of the roller blind, and when the roller blind reaches the contact position, the motor housing is responsive to its torque. The small plate is driven to one of the limit stoppers by driving, and the limit stopper pushes back the small plate to enable movement along the pillar, so that the switch is rotated when the operating arm rotates. It may be configured to be positioned on the orbit.
[0012]
According to a particular form of the invention, in order to allow installation on either the left or right side, a cylindrical cage fixed in the winding tube, two control rods fixed in the housing, A calibration spring that resists rotation of the housing, a pair of lever-shaped switches and a pair of actuating arms placed symmetrically about the axis of the cage, and means for locking the disk in a selected angular position. The switch and the actuating arm are fixed to a disk having a plane of symmetry passing through the axis and capable of forming an angular position. From the above configuration, the symmetry plane of the disk is inclined to the left or right side with respect to the symmetry plane of the cage. The control rod and the spring are symmetrically installed on the axial symmetry plane of the cage. The disc is movable in the axial direction by a spring action. One of the switches operates at the time of unwinding, and the torque required for the operation of the switch changes when the disk is placed in an asymmetric position, and reaches a maximum torque corresponding to the stop at the upper limit stop position.
[0013]
Such a drive 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 the other depending on the installation position. The support, in particular the rotating disc, can be moved in one direction or the other so that the switch that operates when the roller blind reaches the upper limit stop position is the switch farther from the operating arm connected to the motor. It is a configuration that moves.
[0014]
The motor stop means can be used in any case where the nominal torque utilized for roller blind automation is reasonable.
The motor housing is preferably held in rotation by two opposing identical springs calibrated at the factory.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an automatic stop device according to an embodiment of the present invention will be described with reference to the accompanying drawings.
The basic principle of the automatic stop device according to the present invention is shown in FIG. The motor housing (not shown) is secured to a support 1 rotating about an axis a and is maintained in a ring by two opposing springs 3 and 4 acting on the two arms 5 and 6 of the support 1. The support 1 has two switches 21 and 22 installed at a distance C1 and C2 from the finger 7, respectively. The support 1 pivots and the finger 7 is either switch 21 or 22 when torque is applied on the motor housing by the roller blind hoisting tube held by the roller blind itself which has reached its limit stop position. One is responsive to the rotational direction of the motor housing. The idea of the present 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 depending on the type of roller blind, the roller blind is fully unwound and the hoisting tube Thus, when the lower limit stop position at which the torque applied by the roller blind on the motor is suddenly reduced is reached, the roller blind is reliably stopped. When the motor stops at the upper limit stop position, the torque required to stop the motor is relatively large. For this reason, the distance of C1 or C2 is adjusted, and the stop at the lower limit stop position generally decreases slightly. Therefore, the distance C1 or C2 is selected to be relatively short.
[0016]
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 runner that moves in a direction transverse to the finger 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 acceptable for a stop device for a roller blind.
[0017]
FIG. 3 shows another form of the method of FIG. 2, in which the switches 21 and 22 are mounted on a disk installed to rotate about the axis a.
FIG. 4 shows one form of a stop device according to the invention, which is the device shown in FIG. 2 of French Patent No. 96 14202. In this form, all components of the device according to French Patent No. 96 14202 are shown for detecting excess torque in the motor housing. The illustrated automatic stop device is likewise installed in the illustrated winding tube 2 and part of it is shown. A collar 10 is fixed to the end of the winding tube 2, and a smooth portion of the collar 10 functions as an end bearing of the winding tube and forms a part of a support 12 that is fixed to a flank of a case (not shown). 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, and the cage 13 holds the housing 14 by elasticity. For this purpose, the housing 14 has two longitudinal bars 15 and 16 which are fixed to the inner wall of the housing 14 by screws 17 and are accommodated as control bars in the grooves of the cage 13. These rods 15 and 16 and the groove are parallel to the common axis of the winding tube 2 and the housing 14 and are formed symmetrically about this common axis. The housing 14 is held around the cage 13 by four sets of V-shaped springs 18 installed between the rods 15 and 16 and the cage 13, and each rod is held between the two sets of springs. Spring retention is calibrated by one or both springs.
[0018]
The other end of the cage 13 terminates at the front wall 20. Two switches 21 and 22 are fixed on the wall 20, and the switches 21 and 22 are planes including the axis of the whole unit and passing through the center of the finger 23 extending forward of the edge of the front wall 20. Symmetrically and parallel to each other. The switches 21 and 22 comprise push buttons 24 and 25 respectively actuated by lever-shaped actuating arms 26 and 27 each having two arms. Two connection terminals 28 and 29 are shown in FIG. 4 for electrical connection to respective switches of a motor (not shown) installed in the extension of the illustrated stop device.
[0019]
The front wall 20 is equipped at its center with a spindle 30 with a head that merges with the geometric axis of the cage 13 extending between the switches 21 and 22. A disk 31 is articulated around the spindle 30 and extends in a substantially semicircular shape to form an axially symmetric surface. This disk 31 carries levers 26 and 27 which are mounted for pivoting on rods 32 and 33. Helical coil springs 34 and 35 are mounted around these rods, and the levers 26 and 27 are held at a fixed distance from the push buttons 24 and 25 of the switch by the torsional stress and compression force. Similarly, a spring 36 is mounted around the spindle 30 that holds the disk 31 against the front wall 20.
[0020]
As will be appreciated, rotation of the motor housing 14 in one direction or vice versa is associated with one of the levers 26 and 27 by the bars 15 and 16. The levers 26 and 27 are thus actuated when the torque exerted on the motor by the winding tube exceeds a certain value and less than another certain value, respectively.
The disk 31 has an axially symmetric surface, has two notches 50 and 51 arranged symmetrically with respect to the axially symmetric surface, for example at an angle of 5 °, and the two arms 53 and 54 are axially symmetric. And their ends are located on the tracks of the rods 15 and 16, respectively.
[0021]
The completed device is brought to the assembler in a neutral position where the disk 31 abuts the end of the finger 23 by the portion 52 separating the notches 50 and 51. In this neutral position, the levers 26 and 27 are positioned at the same distance from the 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 disk 31. When the disk 31 rotates to the left, the finger 23 is locked to the notch 50 as shown in FIG. 4 and the disk 31 is pushed back by the spring 36. In this position, in order to actuate the lever 26, the bar 15 rises and moves to the neutral position, which means that a greater torque must be applied to the hoisting tube in order to actuate the switch 21. This torque makes it possible to 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 necessary for the operation of the switch 22 is shortened. This means that a relatively smaller torque is sufficient to operate the switch 22, and the switch 22 may be a lower limit stop switch. The switch 22 operates permanently on the housing 14 with no torque load.
[0022]
With respect to the motor installation location, 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, thereby locking the finger 23 to the notch 51.
The positioning of the disk 31 can be automatically performed depending on the rotation direction of the motor corresponding to the winding when the installation is first performed by the interlocking by one of the longitudinal bars 15 and 16 of the arm 53 or 54 of the disk 31. .
[0023]
Accordingly, when the unwind roller blind reaches the lower limit stop position at the position shown in FIG. 4, the longitudinal bar 16 near the lever 27 controls the stop of the motor. In this case, the movement of the longitudinal bar 16 corresponds to, for example, a torque drop 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 practically reached only when all of the roller blind unwinding platelets are stacked. Therefore, this torque is small. Similarly, when the roller blind encounters an obstacle during unwinding, the torque value is applied before unwinding is completed. Therefore, this stop device stops the roller blind when an obstacle is encountered when the roller blind is lowered.
[0024]
FIGS. 5 and 6 show another means of improving the symmetrical distance between the actuating arm and the pair of switches 21 and 22.
The support 1 is installed so as to rotate about an axis a having an arm 7. In the neutral position, the arm 7 is equidistant from the switches 21 and 22. The arm 7 has a cover 60 with a cylindrical column 61 extending at one end extending to the axis of the arm 7 at the center thereof. The lower end (on the drawing) of the rod or column 61 has a base 62 having a diameter greater than that of the column 61 and connected to the column by a frustoconical portion. The outer end portion 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 straight elongated hole 65, and the column 61 passes through the elongated hole. The long hole 65 expands at each end thereof to form enlarged portions 66 and 67, and the diameter of the long hole 65 is slightly larger than the diameter of the base 62 of the column 61. When installed in the factory, the small plate 64 extends symmetrically to both sides of the arm 7, and a truncated cone shape of the base 62 of the column 61 under the thrust of the spring 68 that compresses between the head 63 and the small plate 64. It is carried on the upper end of the part.
[0025]
At this position of the small plate 64, limit stoppers 69 and 70 are disposed on both sides of the arm 7, respectively. Switches 21 and 22 are mounted at the lower level in the drawing.
In the neutral position of FIG. 5, the small plate 64 is equally spaced from the switches 21 and 22 when descending along the axis of the arm 7.
[0026]
When installing the roller blind, the assembler first controls the roller blind winding. 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. The small plate 64 immediately abuts against a limit stopper 69 that may be very close to the small plate 64. A limit stopper 70 may be used instead of the limit stopper 69. In this way, the small plate 64 receives the thrust and rushes to the left with respect to the arm 7. When the small plate enlargement 66 reaches the base 62 of the column 61 and faces it, the small plate 64 is pushed into the base by the spring 68 and occupies the level of the switches 21 and 22. When the arm 7 returns to the neutral position, the distance C1 between the small plate 64 and the switch 21 is substantially larger than the distance between the small plate 64 and the switch 22 as shown. Thus, the torque required for the operation of the switch 21 is substantially larger than the torque required for the operation of the 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, automatic positioning in an asymmetrical manner takes place at the first winding of the roller blind.
[0027]
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 showing a first method of changing the distance between an actuating arm and two switches.
FIG. 3 is a diagram showing a second method of changing a distance between an operating 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 form using a third method for changing a distance between an operating arm and a pair of switches.
6 is a diagram showing the device according to FIG. 5 after changing the distance between the actuating arm and the pair of switches.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,11 ... Support 2 ... Winding tube 3, 4 ... Spring 5, 6 ... Arm 7 ... Finger (operation arm)
14 ... Motor housings 21, 22 ... Switches 26, 27 ... Lever (operating arm)
31 ... Disk 61 ... Pillar 64 ... Small plates 65, 66 ... Long holes 69, 70 ... Limit stopper

Claims (6)

An automatic stopping device for a tubular electric motor that drives a winding shaft such as a roller blind that reaches a stop limit at a winding ascending position, the automatic stopping device comprising a housing, the motor, the winding shaft, an operating arm, A release device that includes a switch and a support, and that cuts off power supply to the motor in response to torque applied to the motor housing by a hoisting shaft when torque increases due to the roller blind reaching the raised position; The housing is arranged to pivot against the movement of the elastic means when the torque applied to the housing by the hoisting shaft exceeds a certain threshold, and the housing is actuated by at least one switch Fixed to the actuating arm to allow The switch or the actuating arm is in the rest position such displacement does not occur in the elastic means, is installed movably to change the distance between the switch and the actuating arm,
The switches are arranged on both sides of the operating arm in order to enable installation on either the left or right side,
The two switches are installed symmetrically with respect to the arm in a torque unloaded state of the motor,
The switch is fixed to the support, and each switch is positioned so as to be in an asymmetric position with respect to the operation arm by movably configuring the switch or the operation arm. Stop device. In order to enable installation on either the left or right side, the actuator is installed so as to be rotatable about a spindle coaxial with the rotation axis (a) of the operating arm (7) and has a plane of symmetry passing through the rotation axis. Including a disk as the support, the disk carrying a pair of switches (21, 22) symmetrically arranged on the symmetry plane, and means for moving the disk by a predetermined angle in both the left and right directions, and 2. The automatic stop device according to claim 1 , further comprising means for positioning the disk at an angular position, whereby a distance between the pair of switches and the operating arm is changed. The automatic stop device according to claim 1 , wherein the switch (21, 22) is installed on a support (8) moving in a direction transverse to the actuating arm (7). The switch (21, 22) is fixed, and the operating arm (7) has an auxiliary piece (64) for operating the switch, and the auxiliary piece is located between each switch and the auxiliary piece. 2. The automatic stop device according to claim 1 , wherein the automatic stop device is movable in a direction transverse to the operating arm so as to be able to change a distance, and can be fixed at two stable positions on the operating arm. The auxiliary piece consists of a small plate having a straight elongated hole (65) forming an enlarged portion (66, 67) spreading at both ends,
The arm (7) has a column (61) extending in the direction of the arm and passing through the long hole of the small plate,
The column has a base (62) having a larger cross-section than the remainder of the column, the base can pass through the enlarged portion (66, 67), and the small plate is within the small plate. When passing through the elongated hole (65) between the enlarged portions, the base is under the action of a spring (68) compression-equipped around the column between the small plate and the head (63) of the column. Supported on the
As a result, when the small plate moves across the column from a position where the small plate is supported on the base (62) of the column at an intermediate portion of the small plate, 5. The automatic stop device according to claim 4 , wherein the small plate is moved along the column by the pressing force of the spring (68) when one faces the base (62) of the column. The switch (21, 22) is located off the orbit of the small plate when the middle part of the small plate (64) is carried on the base (62) of the column,
The apparatus comprises two limit stoppers (69, 70) disposed on each side of the arm on the small plate orbit,
When the motor is first driven in a direction corresponding to the roller blind hoisting , and the roller blind reaches the hoisting raised position , the small plate is limited by driving the motor housing with torque as a reaction force. Displace to one of the stoppers (69, 70), and the limit stopper pushes back the small plate to allow movement along the column;
As a result, the automatic stop device of claim 5 , wherein the switch is positioned on the trajectory of the small plate as the operating arm rotates.

Images