JP7244010B2 - Electric blind driving device and electric blind - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric blind driving device for raising and lowering a shielding material, and an electric blind.

An electric horizontal blind rotates a slat drive shaft with the driving force of a motor, and winds or unwinds a lifting cord with a winding device, thereby lifting and lowering a slat as a shielding material. In the electric roll blind, the winding shaft is rotated by the driving force of the motor, and the screen is wound up or down around the winding shaft, thereby moving up and down the screen.

Such an electric blind is provided with a brake device that prevents rotation of the motor output shaft due to the weight of the slats and screen, or rotation of the motor output shaft due to the inertia torque of the screen winding shaft when the motor is stopped. There is a thing (see patent document 1).

Japanese Patent No. 5075570

By the way, as the slats and screens of electric blinds become larger, a motor with a larger torque is required accordingly. Also, it is necessary to increase the braking force of the brake device that prevents the rotation of the output shaft of the motor.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric blind driving device and an electric blind that can increase the braking force.

An electric blind driving device for solving the above problems comprises a motor having an output shaft, a housing in which the output shaft protrudes, a wheel connected to the output shaft, a coil portion, and from the coil portion and a torsion spring with the coil portion attached to the housing, each of the arm portions pressing against the outer peripheral surface of the wheel.

In the drive device for an electric blind, two torsion springs may be arranged at point-symmetrical positions with respect to the center of the wheel.
In the drive device for an electric blind, the torsion spring may be supported by a washer that closes a space to which the torsion spring is attached.

An electric blind for solving the above problems is provided with the drive device as described above, and the output shaft is connected to a drive shaft for raising and lowering the shielding material.

According to the present invention, braking force can be increased.

It is a front view of an electric horizontal blind. (a) is a front view of the driving device, and (b) is a cross-sectional view along line AA of FIG. The side view of a drive. Sectional drawing corresponding to FIG.2(b) which shows the modification of a drive device.

An electric blind to which the present invention is applied will be described below with reference to the drawings.
As shown in FIG. 1, the electric horizontal blind has multiple stages of slats 3 as shielding materials supported by ladder cords 2 suspended from a head box 1 in which a bottom rail and a slat lifting device are arranged. , a bottom rail is attached to the lower end of the ladder cord 2. A lifting cord 4 is inserted through the slat 3 in the vicinity of the supporting position of the ladder cord 2, and a bottom rail is suspended from the lower end of the lifting cord 4. - 特許庁The lifting cord 4 may be a lifting tape.

A motor 5 and a gearbox 6 are arranged on one side of the headbox 1 to form an electric driving device for raising and lowering the slats 3 and the bottom rail. A gearbox 6 is fixed to the headbox 1 and a motor 5 is fixed to the gearbox 6 . The motor 5 is rotated forward and backward based on a control signal supplied from the operation switch via the cable 7 .

An output shaft 6 a (see FIG. 2( a )) of the gearbox 6 is connected to a drive shaft 9 via a connecting member 8 . The drive shaft 9 extends inside the headbox 1 and is inserted through a winding pipe 11 that is rotatably supported by a support member 10 at a plurality of locations inside the headbox 1 . The winding pipe 11 rotates integrally with the drive shaft 9 .

A ladder cord support device 12 is provided at the base end of the winding pipe 11 , and the ladder cord 2 is suspended from the ladder cord support device 12 . A large number of slats 3 are supported by the ladder cord 2 .

The upper end of the lifting cord 4 is attached to the winding pipe 11, the lifting cord 4 is inserted through the slat 3, and the bottom rail is suspended from the lower end thereof. Then, when the winding pipe 11 is rotated based on the rotation of the drive shaft 9, the lifting cord 4 is wound up or unwound on the winding pipe 11, and the slat 3 is moved up and down. In addition, each slat 3 is rotated via the ladder cord 2 as the winding pipe 11 rotates, and after each slat 3 is rotated to a substantially vertical direction, the action of the ladder cord support device 12 causes each slat 3 to rotate. Further rotation of the slats 3 in the same direction is blocked.

The motor 5 is provided with a braking device 17 for braking the rotation of the output shaft 13, as shown in FIGS. A specific configuration thereof will be described below. The brake device 17 includes a brake housing 14 that is a housing, an output gear 15 , a brake wheel 16 that is a wheel, and a torsion spring 21 .

The output shaft 13 protrudes into a brake housing 14 provided on one side of the motor 5, and an output gear 15 is fitted to the tip of the output shaft 13, and a brake wheel 16 made of iron is fitted to the base of the output gear 15. It is The output gear 15 and the brake wheel 16 are rotated integrally with the output shaft 13 . In addition, a first groove 18a and a second groove 18b, which are concave-shaped cross-sectional grooves, are formed on the outer peripheral surface of the brake wheel 16 over the entire circumference. The first groove 18a and the second groove 18b are provided parallel to each other at different heights in the axial direction of the output shaft 13 .

The brake housing 14 is provided with a space 26 having a concave shape and an annular shape. At the bottom of the space 26, two bosses 20 are formed on both sides of the output shaft 13 at point-symmetrical positions with respect to the center of the output shaft 13. A torsion spring 21 is attached to each boss 20. As shown in FIG. The torsion spring 21 is a torsion coil spring. The torsion spring 21 includes a coil portion 22 wound with a steel wire, a first arm portion 23 a extending from one end of the coil portion 22 , and a second arm portion 23 a extending from the other end of the coil portion 22 . and an arm portion 23b. The distal end portion of the first arm portion 23a and the distal end portion of the second arm portion 23b are biased toward each other. For example, one end of the coil portion 22 is the lower end, the other end is the upper end, and the first arm portion 23a and the second arm portion 23b extend from different heights of the coil portion 22. .

The height from the proximal end to the distal end of the boss portion 20 substantially matches the height from the lower end to the upper end of the coil portion 22 . The outer diameter of the boss portion 20 corresponds to the inner diameter of the coil portion 22 and has the same or substantially the same dimension as the inner diameter of the coil portion 22 . The position where the first arm portion 23a extends from the lower end portion of the coil portion 22 corresponds to the position of the first groove 18a closer to the proximal end of the boss portion 20, and the second arm portion 23b extends from the coil portion 22. The position extending from the upper end of the boss portion 20 corresponds to the position of the second groove 18b in the direction close to the upper end of the boss portion 20. As shown in FIG.

The two boss portions 20 are provided on both sides of the output shaft 13 in the brake housing 14 . That is, the two boss portions 20 are arranged point-symmetrically with respect to the center of the output shaft 13 . A coil portion 22 of a torsion spring 21 is fitted to each boss portion 20 . The first arm portion 23a of each torsion spring 21 is pressed against the first groove 18a, and the second arm portion 23b is pressed against the second groove 18b. That is, each torsion spring 21 presses the brake wheel 16 at two points.

The torsion springs 21 attached to the two bosses 20 are the same and are attached to the respective bosses 20 upside down. The pressing force acting on the brake wheel 16 from the torsion spring 21 acts on the brake wheel 16 in opposing directions and cancels each other, so that unnecessary torsional force acting on the output shaft 13 is suppressed. be able to.

The action of the motor 5 having the brake device 17 configured in this way will be described.
In motor 5 with brake device 17 , output gear 15 meshes with a reduction gear mechanism within gearbox 6 . When the drive shaft 9 is rotated in the downward direction of the slats 3, the output shaft 13 is rotated in one direction, and when the drive shaft 9 is rotated in the upward direction of the slats 3, the output shaft 13 is rotated in the other direction. be done. The torsion spring 21 and the brake wheel 16 are always in contact with each other, and the frictional force acts as a braking force against the rotation of the output shaft 13 . Due to this operation, when the operation of the motor 5 is stopped, the braking force of the brake device 17 suppresses the rotation of the output shaft 13 . Therefore, the slats 3 are prevented from dropping due to their own weight after the operation of the motor 5 is stopped.

The rotational force due to the weight of the slats 3 is transmitted to the output shaft 13 of the motor 5 via the reduction gear in the gearbox 6, so the rotation of the drive shaft 9 is accelerated by the gearbox 6 and transmitted to the output shaft 13. be done. Then, since the rotational torque transmitted to the output shaft 13 is small, the braking force of the braking device 17 that brakes the output shaft 13 can be reduced.

As described above, according to the above embodiment, the following effects can be obtained.
(1) Each torsion spring 21 contacts the brake wheel 16 at two points, and the brake wheel 16 is pressed at a total of four points by the four arms 23a and 23b. Thereby, the braking force of the output shaft 13 can be increased. Therefore, when the operation of the motor 5 is stopped, the rotation of the output shaft 13 of the motor 5 is suppressed by the brake device 17, and the slats 3 can be prevented from dropping due to their own weight. And it can correspond to a larger horizontal blind.

(2) Since the arm portions 23a and 23b of the torsion spring 21 are engaged with the first groove 18a and the second groove 18b, a stable frictional force can be generated on the brake wheel 16.

(3) Since the height of the first arm portion 23a corresponds to the height of the first groove 18a, the first arm portion 23a can reliably continue to engage with the first groove 18a. Since the height of the second arm portion 23b corresponds to the height of the second groove 18b, the second arm portion 23b can reliably continue to engage with the second groove 18b. Also, it is possible to prevent the first arm portion 23a from coming off from the first groove 18a and the second arm portion 23b from coming off from the second groove 18b due to an impact or the like. In addition, it is possible to make it difficult for the coil portion 22 to come off from the boss portion 20 .

(4) Only by fitting the torsion spring 21 to the boss portion 20 and engaging the tip portions thereof with the grooves 18a and 18b of the brake wheel 16, the brake device 17 can be assembled with simple work.

(5) Since only the torsion spring 21 is provided around the brake wheel 16, the size of the brake housing 14 can be reduced in the radial direction of the motor 5. Therefore, it is possible to contribute to the miniaturization of the headbox 1 .

(6) The pressing force acting on the brake wheel 16 from the torsion spring 21 acts on the brake wheel 16 in opposite directions and cancels each other, so that an unnecessary torsional force acts on the output shaft 13. can be suppressed.

It should be noted that the above embodiment can also be implemented with the following modifications.
- Although the first groove 18a and the second groove 18b are provided in the number of the torsion springs 21, the grooves do not have to be provided in the brake wheel 16. In this case, the arm portions 23a and 23b are brought into contact with the outer peripheral surface of the brake wheel 16 without grooves. For example, if the width of the outer peripheral surface of the brake wheel 16 is significantly larger than the vertical interval between the arm portions 23a and 23b, the arm portions 23a and 23b are less likely to come off the outer peripheral surface, and there may be cases where the grooves do not need to be provided. .

- The first groove 18a and the second groove 18b may be combined to form one groove, and the arm portions 23a and 23b may be engaged with this one groove. In this case, the width of one groove should be the same or substantially the same as the vertical interval between the arm portions 23a and 23b. This makes it difficult for the torsion spring 21 to come off the boss portion 20 .

- You may make it apply|coat grease to the 1st groove|channel 18a and the 2nd groove|channel 18b. When the grease is applied, wear due to contact between the arm portions 23a and 23b is reduced, and durability is improved.

- Three or more torsion springs 21 may be provided at regular intervals to ensure a sufficient braking force. For example, if there are four torsion springs 21 , they can be arranged at points symmetrical with respect to the center of the output shaft 13 . The number of torsion springs 21 is determined by factors such as the weight of the slats 3 and bottom rails and the spring multiplier of the torsion springs used. Therefore, the number of torsion springs 21 may be one as long as the required braking force can be secured.

- You may attach several torsion springs 21 so that it may overlap with respect to the one boss|hub part 20. FIG. For example, a plurality of torsion springs 21 can be attached to one boss portion 20 by reducing the number of turns and thinning the coil portion 22 of each torsion spring 21 . Thereby, the braking force can be adjusted by the number of torsion springs 21 . Alternatively, the boss portion 20 may be made taller and a plurality of torsion springs 21 may be attached to one boss portion 20 . In this case, the brake wheel 16 is also thickened according to the height of the boss portion 20 . In this case, the number of turns of the coil portion 22 may not be reduced.

- Not all the arm portions 23a and 23b of the torsion spring 21 need to be engaged with the grooves. That is, there may be only one groove and only one of the arm portions 23a and 23b may be engaged with the groove.

- As shown in FIG. 4, the brake wheel 16 may omit the first groove 18a and the second groove 18b. In this case, the coil portion 22 of the torsion spring 21 is easily detached from the boss portion 20 . Therefore, in the brake housing 14 , the recessed and annular space 26 formed around the brake wheel 16 is closed by the washer 27 . That is, a boss portion 20 is provided at the bottom of the space portion 26 and the coil portion 22 of the torsion spring 21 is attached to the boss portion 20 . The washer 27 has an annular shape and size corresponding to the shape of the opening of the space 26 . Note that the washer 27 may be attached by fixing means such as a screw or an adhesive so as to close the opening of the space 26 from the upper side of the torsion spring 21 . Also, the washer 27 may be attached by being engaged with a projection or groove formed on the side wall of the space 26 . Alternatively, the washer 27 may be attached by fitting the inner peripheral wall and/or the outer peripheral wall erected on the inner peripheral edge of the washer 27 into the space portion 26 . As an example, the washer 27 is arranged to contact the top surface of the boss portion 20 . This makes it difficult for the coil portion 22 of the torsion spring 21 attached to the boss portion 20 to come off from the boss portion 20 even if the first groove 18a and the second groove 18b are omitted. Moreover, the processing cost of the first groove 18a and the second groove 18b can be reduced.

- The driving device of the motor 5 may be used for an electric roll blind that uses a screen as a shielding material and electrically winds the screen around a winding shaft.

DESCRIPTION OF SYMBOLS 1... Head box, 2... Ladder cord, 3... Slat, 4... Lifting code, 5... Motor, 6... Gear box, 6a... Output shaft, 7... Cable, 8... Connection member, 9... Drive shaft, 10... Support Member 11 Winding pipe 12 Ladder cord support device 13 Output shaft 14 Brake housing 15 Output gear 16 Brake wheel 17 Brake device 18a First groove 18b Second Groove 20 Boss portion 21 Torsion spring 22 Coil portion 23a First arm portion 23b Second arm portion 26 Space portion 27 Washer.

Claims (4)

a motor having an output shaft;
a housing having an output shaft protruded therein;
a wheel connected to the output shaft;
a torsion spring comprising a coil portion and two arm portions extending from the coil portion, the coil portion being attached to the housing;
An electric blind drive device in which each of the arm portions presses the outer peripheral surface of the wheel. 2. The electric blind driving device according to claim 1, wherein two torsion springs are arranged at positions symmetrical with respect to the center of the wheel. The electric blind driving device according to claim 1 or 2, wherein the torsion spring is supported by a washer that closes a space to which the torsion spring is attached. A driving device according to any one of claims 1 to 3,
An electric blind, wherein the output shaft is connected to a drive shaft that raises and lowers the shielding material.

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