JP5270987B2 - Electric blind motor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor unit of an electric blind, which can exert a holding force for preventing the descent of a screen material by self-weight, and which can easily adapt even to the case of different necessary holding forces. <P>SOLUTION: This motor unit comprises a motor 34 which has an output shaft 36 operatively connected to a blind driving shaft, and a holding mechanism 38 provided between the output shaft 36 of the motor 34 and a motor casing 34b. The holding mechanism 38 is provided with a magnetic plate 48 provided in such a manner as to be unrotatable relatively to the motor casing 34b and which undergoes the penetration of the output shaft 36, and a magnet 52 which is rotated integrally with the output shaft 36 and attracted to the magnet plate 48. The magnet 52 and the magnetic plate 48 have an attractive force which can apply holding torque, high enough to prevent the rotation of the output shaft 36 by the self-weight of the screen material 12, to the output shaft 36. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a motor device for an electric blind that applies a rotational force to a blind drive shaft of a blind body to operate a shielding material, and in particular, when an operation of the motor is stopped, an output shaft of the motor due to its own weight. The present invention relates to a motor device for an electric blind that can prevent rotation of the motor.

  As a conventional motor device of this type of electric blind, for example, the one disclosed in Patent Document 1 is known. In order to prevent rotation of the output shaft of the motor due to the dead weight of the slat as a shielding material when the operation of the motor is stopped, this motor device is provided with a brake device that applies a braking force to the rotation of the output shaft of the motor. It has been. The brake device includes a brake wheel attached to the output shaft and a brake pad that slides against the outer peripheral surface of the brake wheel by the urging force of the coil spring. When the motor is stopped, the brake pad is The rotation of the output shaft of the motor is prevented by sliding contact with the slat, thereby preventing the slat from dropping its own weight.

JP 2007-197952 A

  By the way, since the holding force necessary for the brake device to prevent the slat from falling due to its own weight varies depending on the type and size of the blind, it is necessary to prepare a plurality of types of brake devices having different holding forces. Therefore, it is necessary to adjust the sliding force of the brake pad to the outer peripheral surface of the brake wheel by changing the brake pad type or preparing a coil spring with different urging force. There is a problem that it is difficult. For example, if the sliding contact force by the brake pad is too strong, there is a risk that the brake pad will be worn heavily and a problem may arise that the operating noise of the motor device will increase.

  The present invention has been made in view of the above problems, and can provide a motor device for an electric blind that can exhibit a holding force for preventing a drop in the weight of a shielding material and can easily cope with different holding forces. The purpose is to provide. Another object of the present invention is to provide a motor device for an electric blind that can achieve a quiet operation sound of the motor device when the blind is raised and lowered.

In order to achieve the above-mentioned object, an invention according to claim 1 is an electric blind motor device that operates a shielding material by applying a rotational force to a blind drive shaft of a blind body, and operates with the blind drive shaft. A motor having an output shaft connected to the motor, and a holding mechanism provided between the non-rotatable fixed portion and the output shaft of the motor,
The holding mechanism is supported in a relatively non-rotatable manner with respect to the fixed portion and has a magnetic plate through which the output shaft passes. The holding mechanism rotates integrally with the output shaft and faces the magnetic plate in the axial direction of the output shaft. a magnet at least indirect contact adsorbed on the plate, the frictional force is acting between the output shaft and the magnetic plate by the adsorption force between the magnetic plate and the magnet, the adsorption between the magnetic plate and the magnet force, characterized by magnitude der Rukoto that can be granted to the output shaft of the magnitude of the holding torque of the rotation can be prevented in the output shaft due to the weight of the shielding material.

  According to a second aspect of the present invention, in the first aspect, a resin washer is interposed between the magnet and the magnetic plate.

  According to a third aspect of the present invention, the magnet case is fixed to the output shaft so as to rotate integrally with the output shaft according to the first or second aspect, and the magnet is not rotatable relative to the magnet case in the magnet case. It is retained.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the magnetic plate is supported by the fixed portion so as to be slidable in the axial direction of the output shaft.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the spring is disposed on both sides of the magnetic plate so as to sandwich the magnetic plate from both sides, and the magnetic plate receives the spring force of each spring and the shaft of the output shaft. It is slidable in the direction.

  According to the present invention, the holding shaft is given a holding torque by the magnet's attracting force, so that the holding shaft can have several times the holding force when the holding mechanism is not provided on the output shaft when the motor is stopped. The fall due to the weight of the shielding material can be prevented. For electric blinds with different types and sizes of blind bodies, the magnets may be changed to magnets having different attractive forces, and the change can be easily performed. Thus, a stable holding torque can be obtained by sliding the magnet and the magnetic plate in sliding contact.

  According to the second aspect of the present invention, the resin washer is interposed between the magnet and the magnetic plate, so that the resin washer reduces the sliding contact resistance between them, so that the surface of the magnet can be prevented from being worn. At the same time, the quietness of the motor operating noise can be enhanced.

  Further, when the magnet is directly attached to the output shaft, the magnet may be damaged depending on the strength of the magnet due to concentration of stress acting from the output shaft because the magnet rotates integrally with the output shaft. According to the invention, by fixing the magnet case to the output shaft and holding the magnet in the magnet case, stress concentration on the magnet can be prevented, and the magnet can be held in a stable state without damaging the magnet. The output shaft can be integrally rotated.

  According to the invention of claim 4, even if the output shaft of the motor moves in the axial direction, the magnetic plate can slide in the axial direction while maintaining the state where the magnet and the magnetic plate are always in close contact with each other. Therefore, the output shaft of the motor can perform a stable operation.

  According to the fifth aspect of the present invention, even if the output shaft of the motor moves in the axial direction, the magnetic plate is maintained in the axial direction of the output shaft while maintaining the state of being always in close contact with the magnet by the biasing force of the spring. The motor can be slid, and the output shaft of the motor can perform a stable operation.

  FIG. 1 is a front view of an example of a blind body to which an electric blind motor device according to an embodiment of the present invention can be applied. The blind body includes a head box 10, a shielding material 12 that is supported indirectly or directly by the head box 10, and a blind drive shaft 14 that is disposed in the head box 10 and operates the shielding material 12.

  In order to rotate the blind drive shaft 14, a motor device 20 is disposed in the head box 10 of the blind body. In the head box 10, a control unit 26 that controls the driving of the motor device 20, a power supply unit 28 that supplies power to the motor device, and a power transformer 30 are disposed, respectively. Is provided with an upper limit switch 32 for detecting when the shielding material 12 comes into contact when the shielding material 12 is raised most.

  The electric blind can be a horizontal blind as shown in the figure, and the motor device 20 is for rotating the blind drive shaft 14 in order to move the slat 12 as the horizontal blind shielding material up and down. Can be used as

  The blind drive shaft 14 extends in the longitudinal direction so as to be rotatable in the head box 10. The blind drive shaft 14 is inserted between the rotary drums 16 and 17 that are pivotally supported at appropriate positions of the head box 10. The rotation can be transmitted in both directions.

  An upper end of a lifting / lowering cord 24 whose lower end is fixed to a bottom rail 22 arranged at the lower end of a large number of slats 12 rows is fixed to the rotating drum 16 so that it can be wound and unwound. Therefore, by rotating the blind drive shaft 14 and rotating the rotary drum 16 and winding and unwinding the lifting / lowering cord 24, the slat 12 row can be lifted and lowered.

  Further, the motor device 20 is not limited to such a lifting / lowering operation of the slats 12, but can be applied to the operation of other shielding materials, for example, the rotation operation of the shielding materials. That is, the upper ends of a pair of vertical cords of the ladder cord 18 that supports a large number of slat 12 rows are connected to the rotary drums 16 and 17 so as to be integrally rotatable only by a predetermined angle of rotation. Then, by rotating the blind drive shaft 14, the rotating drums 16 and 17 are rotated, the ladder cord 18 is tilted, and the slat 12 can be rotated.

  2-5 is a figure which shows the principal part of the motor apparatus 20 by 1st Embodiment of this invention.

  The motor device 20 includes a motor 34 and a holding mechanism 38. The motor 34 has a pair of motor shafts 34a projecting from both ends of a cylindrical motor housing 34b. The output shaft 36 integrated with each motor shaft 34 a is directly or indirectly connected to the blind drive shaft 14 and can transmit rotation to the blind drive shaft 14, that is, operates on the blind drive shaft 14. Connected.

  The holding mechanism 38 is provided between one output shaft 36 of the motor 34 and a non-rotatable motor housing 34b serving as a fixed portion, and applies a predetermined holding torque to the output shaft 36. . The holding mechanism 38 is roughly supported by the motor housing 34b via the holder 42, and the one output shaft 36 penetrates the magnetic plate extending in a plane perpendicular to the axial direction of the output shaft 36. 48 and a magnet 52 that can rotate integrally with the one output shaft 36 and can be attracted to the magnetic plate 48.

The holder 42 is attached to the end of the motor housing 34 b of the motor 34 with a bolt 44 via a cushioning material 40. One end of a pair of guide shafts 46 is screwed into the holder 42, and the pair of guide shafts 46 are arranged in parallel with the output shaft 36 of the motor 34 and pass through the magnetic plate 48. Thus, the magnetic plate 48 is guided so as to be movable in the axial direction with respect to the pair of guide shafts 46, but cannot be rotated around the output shaft 36 of the motor 34 by the pair of guide shafts 46. Supported.

  As shown in FIG. 5, the output shaft 36 of the motor 34 is formed with a reduced diameter portion 36a, and the magnet shaft 56 is fixed to the reduced diameter portion 36a by press fitting. It is press-fitted into 34a.

  The magnet case 56 includes an inner cylinder part 56a that directly contacts the reduced diameter part 36a, an outer cylinder part 56b, and an annular housing part 56c that is located between the inner cylinder part 56a and the outer cylinder part 56b. A donut-shaped magnet 52 is inserted into a space formed between the inner cylindrical portion 56a, the outer cylindrical portion 56b, and the annular housing portion 56c. The case 56 is held in a relatively non-rotatable manner. Since the notch part 56d (refer FIG. 4) is suitably formed in the outer cylinder part 56b, the press-fit of the magnet 52 can be buffered by this notch part 56d. As described above, the magnet 52 is not directly attached to the output shaft 36 of the motor 34 but is attached via the magnet case 56, so that the magnet 52 can be prevented from being damaged. If the magnet is directly attached to the output shaft 36, the magnet 52 may be damaged depending on the strength of the magnet 52 due to concentration of stress acting on the output shaft 36 because the magnet 52 rotates integrally with the output shaft 36. However, by fixing the magnet case 56 to the output shaft 36 and holding the magnet 52 in the magnet case 56, stress concentration on the magnet 52 can be prevented, and damage to the magnet 52 can be prevented. .

  A resin washer 54 having grease applied on both sides is disposed on the magnet 52. As the resin washer 54, a known polyslider (manufactured by Asahi Polyslider Co., Ltd.) or the like can be used.

  Since the magnetic plate 48 and the magnet 52 attached to the output shaft 36 of the motor 34 are attracted to each other via the resin washer 54, the output shaft 36 of the motor 34 is rotated by its attracting magnetic force. A frictional force that hinders the operation is always generated.

Next, the operation of the present embodiment will be described.
When the rotation of the motor 34 is stopped and the slat 12 row is not operating, the rotation from the motor 34 is not transmitted to the output shaft 36, and a certain holding force is transmitted from the motor 34. Exceeding the holding force, a rotating force in a direction of lowering the slat 12 row is applied via the blind drive shaft 14 by the dead weight of the slat 12 row. However, since a static friction force is generated between the output shaft 36a and the magnetic plate 48 due to the attractive magnetic force between the magnet 52 and the magnetic plate 48, the static friction force prevents the output shaft 36 from rotating and restraining. The holding force to act. This holding force can be several times greater than the holding force of the motor 34 itself that does not include the holding mechanism 38 at all. As a result, the output shaft 36 is held in a stationary state, and a drop due to the weight of the slat 12 row is prevented.

  Next, when the user operates an operation unit (not shown), a command signal from the operation unit is sent to the control unit 26 wirelessly or by wire. For example, when the control unit 26 drives the motor 34 in the rotational direction corresponding to the ascending or descending according to the ascending or descending / decreasing command signal from the operation unit, the rotation is transmitted from the output shaft 36 to the blind drive shaft 14, and the rotating drum 16 winds or unwinds the lifting / lowering cord 24, and the slat 12 row rises or descends. At this time, the magnet case 56 and the magnet 52 are also rotated integrally with the output shaft 36 by the rotational drive of the motor 34, and between the output shaft 36 a and the magnetic plate 48 by the attractive magnetic force between the magnet 52 and the magnetic plate 48. Thus, a dynamic friction force is generated, and a load that impedes rotation is applied to the output shaft 36. However, since the dynamic friction force is considerably smaller than the static friction force, it does not affect the operation of the slat 12 rows. Since the resin washer 54 is interposed between the magnet 52 and the magnetic plate 48, the sliding contact resistance between the magnet 52 and the magnetic plate 48 can be reduced. In addition to being prevented, it is possible to improve the quietness of the operation sound of the motor device.

  As described above, the magnetic force of the magnet 52 of the holding mechanism 38 must be capable of exhibiting a holding force that prevents the slat 12 row from dropping its own weight when the slat 12 row is stopped. For this reason, the magnetic force of the magnet 52 is such that the holding torque due to the static friction force between the output shaft 36 and the magnetic plate 48 generated by the magnetic force lowers the output shaft 36 due to the weight of the slats 12 rows acting on the output shaft 36. It is necessary to set so as to be larger than the torque to be rotated in the direction. If the type and size of the blinds change, the set magnetic force needs to be changed, but the magnetic force can be easily changed by changing the material of the magnet 52 without changing the shape and dimensions of the magnet 52. Can do. Specifically, a neodymium magnet (nickel plating), a summer coke magnet, or the like may be used.

  At this time, since the magnetic force can be finely adjusted, it is possible to easily cope with different holding force requirements without changing the configuration other than the magnet 52.

  Since the magnetic plate 48 is movable in the axial direction of the output shaft 36 by the guide shaft 46, even when the motor shaft 34a and / or the output shaft 36 of the motor 34 is displaced in the axial direction, the magnetic plate 48 and Can be maintained.

  FIG. 6 is a diagram showing the motor device 20 of the second embodiment in which the movement of the magnetic body 48 in the axial direction is further improved. In the figure, the same members and portions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, two springs 60 and 62 are fitted to the outer peripheral surface of the guide shaft 46 so as to sandwich the magnetic plate 48 from both sides, and the spring 60 is formed between the tip of the guide shaft 46 and the magnetic plate 48. The spring 62 is inserted between the holder 42 and the magnetic plate 48 in a compressed state. Thus, the springs 60 and 62 press the magnetic plate 48 in directions opposite to each other from both sides thereof, and by setting the spring force of the springs 60 and 62 substantially equal, the magnetic plate 48 is The guide shaft 46 is centered so as to be positioned at the center in the axial direction.

  Even if the motor shaft 34a and / or the output shaft 36 of the motor 34 may be displaced in the axial direction, the magnetic plate 48 is compressed by one of the springs 60 and 62 and expanded by the other, so that the motor shaft 34a. And / or the displacement of the output shaft 36 can be followed. Thus, the magnetic plate 48 can be slid in the axial direction of the output shaft 36 while always maintaining close contact with the magnet, and the output shaft 36 of the motor 34 can perform a stable operation.

It is a front view which shows an example of the blind main body which can apply the motor apparatus of the electric blind which concerns on embodiment of this invention. It is a side view of the motor device of a 1st embodiment. It is sectional drawing of the one end part of the motor apparatus of 1st Embodiment. It is AA sectional drawing of FIG. It is an exploded sectional view of the one end part of the motor device of a 1st embodiment. It is sectional drawing of the one end part of the motor apparatus of 2nd Embodiment.

Explanation of symbols

12 Slats (shielding material)
14 Blind drive shaft 20 Motor device 34 Motor 34b Motor housing (fixed part)
36 Output shaft 38 Holding mechanism 48 Magnetic plate 52 Magnet 54 Resin washer 56 Magnet case 60, 62 Spring

Claims (5)

A motor device (20) of an electric blind that applies a rotational force to the blind drive shaft (14) of the blind body and operates the shielding member (12),
A motor (34) having an output shaft (36) operatively connected to the blind drive shaft (14), and a non-rotatable fixed portion (34b) and an output shaft (36) of the motor (34) are provided. A holding mechanism (38),
The holding mechanism (38) is supported so as not to rotate relative to the fixed portion (34b), and the magnetic plate (48) through which the output shaft (36) passes, and the output shaft (36) rotate integrally with the output shaft. A magnet (52) facing the magnetic plate (48) in the axial direction of (36) and adsorbing to the magnetic plate (48) by magnetic force and at least indirectly contacting the magnetic plate (48); suction force of the friction force between the magnetic plate by the adsorption force of the magnet (52) (48) and the output shaft (36) is applied, the magnetic plate (48) and magnet (52), the shielding material (12) the output shaft (36) the output shaft (36) electric blind of a motor and wherein the magnitude der Rukoto that can be granted to the magnitude of the holding torque that can prevent rotation of the by its own weight of.   The motor device of the electric blind according to claim 1, wherein a resin washer (54) is interposed between the magnet (52) and the magnetic plate (48).   A magnet case (56) is fixed to the output shaft (36) so as to rotate integrally with the output shaft (36), and the magnet (56) cannot rotate relative to the magnet case (56) in the magnet case (56). 52) is held, the motor device of the electric blind according to claim 1 or 2.   The electric blind motor according to any one of claims 1 to 3, wherein the magnetic plate (48) is supported by the fixed portion (34b) so as to be slidable in the axial direction of the output shaft (36). apparatus.   On both sides of the magnetic plate (48), springs (60, 62) are arranged so as to sandwich the magnetic plate (48) from both sides, and the magnetic plate (48) outputs while receiving the spring force of each spring (60, 62). 5. A motor device for an electric blind according to claim 4, wherein the motor device is slidable in the axial direction of the shaft (36).

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