JPH0588262A - Roll screen take-up device - Google Patents

Abstract

PURPOSE:To provide an inexpensive roll screen take-up device which has a take-up pipe having a small diameter and where noise in the middle of operation is small. CONSTITUTION:Both ends of the take-up pipe 2 are rotatably supported by a pair of collars 3 and 4 fixed on a rigid member 5, and a motor gear housing member 6 is inserted inside the pipe 2 and one end of the member 6 is fixed on one of the collars 3 and 4. A motor 7 for taking up a roll screen and a gear unit 8 are fixed on the inside of the member 6 through elastic rings 17 and 18, and the output shaft of the gear unit 8 is coupled with the inner peripheral surface of the pipe 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll screen winding device having an upper winding pipe for a roll screen and a winding motor inside the winding pipe.

[0002]

2. Description of the Related Art Generally, a winding pipe is provided, a motor gear housing member is inserted in the winding pipe, and a gear unit including an AC motor and a planetary gear and an encoder are provided in the motor gear housing member. Roll screen winding devices are known. FIG. 5 shows a conventional roll screen winding device. A roll screen winding device generally designated by reference numeral 21 has a winding pipe 22, which is a pair of collars 23, 2 for supporting the winding pipe.
Both ends are rotatably supported by 4. The collars 23 and 24 are fixed to a rigid member 25 such as a wall or a frame member. A motor gear housing member 26 is inserted inside the winding pipe 22, and one end of the motor gear housing member 26 is fixed to the inner end surface of the collar 24 on one side. Inside the motor gear housing member 26, an AC motor 27 as a drive source, a gear unit 28 composed of a planetary gear,
An encoder 29 for detecting the rotation speed and position of AC motor 27 is housed. The AC motor 27, the gear unit 28, and the encoder 29 are integrally formed, and fixed to the motor gear housing member 26 by a fixing screw 30. The tip of the output shaft 28a of the gear unit 28 is fixed to a coupling 31 fixed to the inner peripheral surface of the winding pipe 22. The AC motor 27 and the encoder 29 are connected to the control circuit box 34 via conductors 32 and 33, respectively. An AC power supply 35 and an operation switch 36 are connected to the control circuit box 34. The control circuit of the control circuit box 34 supplies a current from the AC power supply 35 to the AC motor 27 according to the operation of the operation switch 36, and receives a signal from the encoder 29 to control the rotation of the AC motor 27.

[0003]

However, the conventional roll screen winding device having the AC motor and the gear unit composed of the planetary gears must be equipped with an AC motor of several tens of watts in order to obtain a predetermined torque. As a result, the outer diameter of the take-up pipe increased.

Since the rotation speed of the AC motor is determined by the frequency of the AC power supply and the number of poles of the motor, the rotation speed that the AC motor can take is generally high depending on the frequency of the commercial power supply and the number of poles of the motor. Limited to ones. In order to reduce this high rotational speed to the required rotational speed, the conventional roll-screen winding device uses a planetary gear that is coaxial and has a high reduction ratio of 30 to 200. However, this planetary gear has a large number of gears due to its structure, and since these many gears rotate at a high speed, there is a problem that a large noise is generated. Therefore, an object of the present invention is to provide an inexpensive roll screen winding device which has a winding pipe of a small diameter and which produces little noise during operation.

[0005]

In order to achieve the above object, a roll screen winding device of the present invention rotatably supports both ends of a winding pipe by a pair of collars fixed to a rigid member and winds the winding pipe. A motor gear housing member is inserted into the pipe, one end of which is fixed to one of the collars, and a motor for winding the roll screen and a gear unit are fixed to the motor gear housing member via an elastic ring. The output shaft of is connected to the inner peripheral surface of the winding pipe.

[0006]

In the roll screen winding device of the present invention, a pair of collars are fixed to a rigid member, both ends of the winding pipe are rotatably fitted to the collars, and a motor gear accommodating member is provided inside the winding pipe. Insert one end of the motor gear housing member to the collar, fix the motor for rolling the roll screen and the gear unit inside the motor gear housing member via the elastic ring, and then rotate the output shaft of the gear unit to the winding unit. Since it is connected to the inner peripheral surface of the pipe, when the motor is rotated, the motor body and the gear unit are held by the rigid member via the elastic ring, the motor gear housing member and the collar so as not to rotate. As a reaction that the motor body is held by the rigid member so as not to rotate, the output shaft of the gear unit rotationally drives the winding pipe, and winds or unwinds the roll screen attached to the outer peripheral surface of the winding pipe.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 schematically shows the structure of a roll screen winding device according to the present invention. In FIG. 1, a roll screen winding device generally designated by reference numeral 1 has a winding pipe 2, and the winding pipe 2 is rotatably supported at both ends by a pair of winding pipe supporting collars 3 and 4. Has been done. Specifically, the collars 3 and 4 have small diameter portions 3a,
4a, and both ends of the winding pipe 2 are loosely fitted to the small diameter portions 3a, 4a of the collars 3, 4. The collars 3 and 4 are fixed to a rigid member 5 such as a wall or a frame member so as not to rotate. A motor gear storage member 6 is inserted inside the winding pipe 2, and the motor gear storage member 6 is inserted.
One end of is fixed to the inner end surface of the collar 4 on one side. A DC motor 7 as a drive source, a gear unit 8 composed of a spur gear or a helical gear, and an encoder 9 for detecting the rotation speed and position of the DC motor 7 are housed inside the motor gear housing member 6. ing. The DC motor 7, the gear unit 8 and the encoder 9 are integrally formed and fixed to the motor gear housing member 6 by a fixing screw 10 so as not to rotate. The output shaft 8a of the gear unit 8 projects from the end of the motor gear housing member 6, and
It is fixed to the coupling 11 fixed to the inner peripheral surface of the. The DC motor 7 and the encoder 9 are connected to the control circuit box 14 by conducting wires 12 and 13, respectively. A DC power supply 15 and an operation switch 16 are connected to the control circuit box 14. The control circuit of the control circuit box 14 supplies a current from the DC power supply 15 to the DC motor 7 in response to the operation of the operation switch 16, and receives a signal from the encoder 9 to control the rotation of the DC motor 7.

Next, the operation of the roll screen winding device of the present invention will be described based on the above configuration. One side of a roll screen (not shown) is fixed to the outer periphery of the winding pipe 2 of the roll screen winding device 1 having the above structure, and the rotation of the winding pipe 2 causes the roll screen to be wound around the outer periphery of the winding pipe. Or, it is paid out.
The operation of winding the roll screen will now be described. When the operator operates the operation switch 16 in the winding direction, the current of the DC power supply 15 is controlled by the control circuit box 14.
The control circuit controls the DC motor 7 to rotate in the winding direction. The rotation of the DC motor 7 is reduced by the spur gear or the helical gear of the gear unit 8 and transmitted to the coupling 11. Since the main body of the DC motor 7 and the main body of the gear unit 8 are fixed to the motor gear housing member 6 via the fixing screw 10, as a reaction thereof, the coupling 11
Rotates. Since the coupling 11 is fixed to the inner peripheral surface of the take-up pipe 2, the take-up pipe 2 has the coupling 1
Rotate with 1, roll up the roll screen. The encoder 9 detects the position and rotation speed of the DC motor 7 and sends them to the control circuit of the control circuit box 14. The control circuit controls the DC motor 7 by the signal of the encoder 9 so that the winding operation is finished at an appropriate position. The operation of feeding the roll screen is the same as the winding operation except that the rotating direction of the DC motor 7 is reversed.

In the above embodiment, the DC motor 7 is used as the drive source of the roll screen winding device 1, and the spur gear or the helical gear is used as the reduction gear. The operation and effect of using the DC motor 7 and the spur gear or the helical gear will be described below. The graph in Figure 2 is
The relationship between the torque and the rotation speed of the DC motor and the AC motor is shown. The solid line A in the figure shows the torque characteristics of the DC motor, and the alternate long and short dash line B shows the torque characteristics of the AC motor. As indicated by the solid line A, the torque T of the DC motor increases linearly as the rotation speed R decreases. On the other hand, as indicated by the alternate long and short dash line B, the torque of the AC motor temporarily increases as the rotation speed R decreases, and then changes within a low torque range. Generally, the AC motor is most efficiently used at the point b shown in FIG. 2 where the torque T is almost maximum. However, since this point b has a large rotational speed Rb,
For practical use, the rotation speed Rb must be reduced by a gear having a large reduction ratio. In addition, since the rotation speed of the AC motor is determined by the frequency of the AC power supply and the number of poles of the motor, it is not possible to freely select a desired rotation speed. On the other hand, the DC motor can freely select the rotation speed and can obtain a large torque at a low rotation speed. Point a shown in FIG. 2 shows an example of an appropriate operating condition of the DC motor, and according to this operating condition, a large torque Ta and a low rotational speed Ra can be obtained at the same time. A DC motor satisfying these operating conditions need only have a small output, and the outer dimensions of the motor itself can be reduced. Furthermore, if you use this DC motor,
Since the required reduction ratio of the reduction gear is small, it is possible to use a gear unit including a spur gear or a helical gear having a small number of gears, a simple structure, and a small external dimension. Since the roll screen winding device 1 of the present invention has the small DC motor 7, the outer diameters of the winding pipe 2 and the motor gear housing member 6 can be reduced. Further, since the DC motor 7 generates a predetermined torque at a low rotation speed, the number of spur gears or helical gears forming the gear unit 8 is reduced, which is combined with the low rotation speed of the DC motor 7. Thus, the noise during operation can be remarkably reduced. Further, since the gear unit 8 is composed of an inexpensive spur gear or helical gear, the manufacturing cost of the roll screen winding device 1 as a whole can be reduced.

FIG. 3 shows another embodiment of the roll screen winding device of the present invention. 3, in which the same parts as those in FIG. 1 are designated by the same reference numerals, the DC motor 7 and the gear unit 8
The encoder 9 is fixed to the motor gear housing member 19 by a pair of rubber rings 17 and 18. Grooves 8a and 7a into which the rubber rings 17 and 18 are fitted are formed on the outer peripheral surfaces of the gear unit 8 and the DC motor 7, respectively. On the other hand, a slit 19 that engages with the rubber rings 17 and 18 is provided on the wall of the motor gear housing member 19.
a and 19b are provided. This slit 19a, 1
The width of 9b is set to about 1/3 of the outer diameter of the rubber rings 17 and 18.

FIG. 4 shows a cross section of the gear unit 8 and the motor gear housing member 19 as seen in the direction of arrow C--C shown in FIG. The gear unit 8 is inserted into the motor gear housing member 19 by fitting the rubber ring 17 into the groove 8a. When the rubber ring 17 is inserted at the position of the slit 19a, a part of the rubber ring 17 expands and engages with the slit 19a, as shown in the figure. Similarly, rubber ring 18
Engages the slit 19b. As a result, the gear unit 8, the DC motor 7, and the encoder 9 are fixed inside the motor gear housing member 19.

[0012]

As is apparent from the above description, since the roll screen winding device of the present invention uses the DC motor as the drive source, it is small in size due to the characteristics of the DC motor which generates a large torque at a low rotation speed. The required torque can be obtained by the motor. As a result, the outer diameter of the motor gear accommodating member for accommodating the DC motor is reduced, and a roll screen winding device having a thin winding pipe can be obtained. Further, since the DC motor can generate a predetermined torque at a low rotation speed, the reduction ratio of the gear unit becomes small, which can be constituted by a small number of spur gears or helical gears. Due to the low rotational speed of the DC motor and the small number of gears in the gear unit, the noise generated by the gear unit during operation can be significantly reduced.

Further, since the structure of the gear unit is simple, it is easy to manufacture and the manufacturing cost of the gear unit itself can be reduced. As a result, the manufacturing of the entire roll screen winding device can be facilitated and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a roll screen winding device of the present invention.

FIG. 2 is a graph showing the relationship between the rotation speed and torque of a DC motor and an AC motor.

FIG. 3 is a sectional view of a roll screen winding device according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a motor gear housing member according to another embodiment of the present invention.

FIG. 5 is a sectional view of a conventional roll screen winding device.

[Explanation of symbols]

 1 Roll Screen Winding Device 2 Winding Pipe 3 Color 4 Color 5 Rigid Member 6 Motor Gear Storage Member 7 DC Motor 8 Gear Unit 9 Encoder 11 Coupling

Claims (3)

[Claims] 1. A pair of collars fixed to a rigid member rotatably supports both ends of a take-up pipe, and a motor gear housing member is inserted into the take-up pipe to fix one end thereof to one of the collars. A roll screen winding motor and a gear unit are fixed to the motor gear housing member via an elastic ring, and the output shaft of the gear unit is connected to the inner peripheral surface of the winding pipe. Screen winding device. 2. The roll screen winding device according to claim 1, wherein a slit that engages with the elastic ring is formed on a wall of the motor gear housing member. 3. The roll screen winding device according to claim 1, wherein grooves for fixing the elastic ring are formed in the motor and the gear unit.