JP2004092215A - Electric shutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a quiet opening/closing operation in a shutter by avoiding the operating sound of a motor and a speed reducer, the overlapping friction sound of a slat, or the like. <P>SOLUTION: The electric shutter comprises: a servo motor 32 for rotating and driving a winding shaft 24 for reeling up a shutter 20; the speed reducer 34 for reducing the speed of the rotation for transmitting to the winding shaft 24; and a servo motor speed control means for increasing/decreasing the rotary speed of the servo motor in steps according to the preset opening/closing position of the shutter. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric shutter, and more particularly to an electric shutter that significantly reduces noise caused by opening and closing operations of the shutter.
[0002]
[Prior art]
2. Description of the Related Art Shutters in the form of doors, in which a number of narrow slats are connected in the width direction, are widely used as doors for entrances to houses, garages, and stores. In recent shutters, an electric shutter in which a winding shaft of the shutter is rotationally driven by a motor has become mainstream.
[0003]
In this type of electric shutter, an AC motor is generally used as a motor of a driving source. In order to obtain the torque and speed required to open and close the shutter, the rotation of the AC motor is transmitted to the winding shaft after being reduced by a speed reducer.
[0004]
In the case of a shutter, if the shutter is opened and closed at an excessively high speed, the shutter is damaged or a loud noise is generated. Therefore, the reduction ratio of the speed reducer is generally increased. For example, when the rotation of the AC motor is 2600 r / min. Then, the speed is greatly reduced to about 12 r / min, and the shutter is slowly opened and closed.
[0005]
In recent years, improvements have been made to reduce noise when opening and closing the shutter. It is well known that in order to suppress noise, it is advantageous that the input rotation speed to the speed reducer is as small as possible. For example, noise is reduced by lowering the input rotation speed of the AC motor to the reduction gear, or the rotation speed of the AC motor is reduced by a frequency conversion method using an inverter. As a conventional technique of the frequency conversion method, for example, there is one disclosed in Japanese Patent No. 2846603.
[0006]
[Problems to be solved by the invention]
Conventionally, the operating noise of the drive mechanism has been reduced by reducing the speed, but there have been disadvantages in that a control device such as an inverter becomes expensive and torque is insufficient.
[0007]
The noise associated with the opening and closing operation of the shutter includes the sound generated by the driving mechanism such as a motor and a reduction gear, the sound of the tip of the slat colliding with the window frame, the sound of the slat rubbing against the guide rail, and the slat. There are various kinds of noise such as the sound of rubbing when they overlap. Although these noises are smaller than the gear contact noise of the gear of the reduction gear, they are sounds that can be heard to the touch in a quiet room.
[0008]
These noises are reduced as the opening / closing speed of the shutter is reduced, but for that purpose, it is necessary to increase the reduction ratio of the speed reducer. There is a problem that the time required is significantly long.
[0009]
Conventionally, the main focus has been on reducing the operating noise of motors and reduction gears, and at present, noise generated variously in a series of processes of opening and closing a shutter is left unchecked.
[0010]
Therefore, an object of the present invention is to solve the problems of the prior art, reduce the noise at each stage in the flow of a series of shutter opening and closing processes as a whole, and reduce the operating noise of the motor and the speed reducer. Another object of the present invention is to provide an electric shutter capable of suppressing a rubbing noise or the like of overlapping slats and realizing a silent opening and closing operation of the shutter.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is an electric shutter for electrically opening and closing a shutter having an opening for ventilation and lighting between slats, wherein a winding shaft for winding the shutter is provided. A rotationally driven servomotor, a speed reducer that accelerates and decelerates the rotation of the servomotor and transmits the rotation to the winding shaft, and a stepped rotation speed of the servomotor according to a preset opening / closing position of the shutter. And a servo motor speed control means for decelerating the motor speed.
[0012]
According to the first aspect of the present invention, by using the servo motor as a driving motor, it is possible to control the steady rotational speed to be considerably lower than the steady rotational speed of the conventional AC motor. As a result, the reduction gear ratio can be made smaller than that of the conventional one, so that the tooth contact noise in the reduction gear can be suppressed, and a mechanical counter and a capacitor are not required, and the motor unit can be made compact.
[0013]
Also, in the invention according to claim 2, the servo motor speed control means performs the first deceleration at a position immediately before the lower end of the shutter reaches the lower frame of the sash, in the closing operation of the shutter, further comprising: The second deceleration is performed at the same time when the lower end portion of the arm reaches the lower frame.
[0014]
Furthermore, in the invention according to claim 3, the servo motor speed control means maintains the minimum speed in the opening operation of the shutter until the lower end of the shutter separates from the lower frame of the sash, and the lower end of the shutter moves to the lower frame. , And stepwise deceleration is performed immediately before the shutter finishes winding.
[0015]
According to the second and third aspects of the present invention, the opening / closing speed is controlled stepwise according to various noise levels during the opening / closing of the shutter, so that the sound of slats rubbing each other or the sound caused by inertia can be effectively eliminated. Can be reduced.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an electric shutter according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view of an embodiment in which the present invention is applied to a sash with a shutter. Reference numeral 10 denotes an upper frame constituting a window frame, and 12 denotes a lower frame. An inner sash 13 and an outer sash 14 are sequentially attached to the window frame from the indoor side. A screen door 15 is attached to the outside of the outer sash 14. The electric shutter 16 is provided outside the screen door. The electric shutter 16 includes a shutter 20, which is a shutter with a series of slats 18, and a shutter winding unit 22.
[0017]
The shutter 20 is a type of shutter in which an opening (gap) for ventilation or lighting is formed between the slats 18. In the case of this embodiment, a hook-shaped connecting part 18a is provided on the upper part of the slat 18, and this connecting part 18 is engaged with the upper adjacent slat 18 so as to be able to move up and down. Therefore, when the shutter 20 is lowered, each slat 18 is suspended and an opening is formed between the slats 18. A skirting board 21 is provided at the lowermost end of the shutter 20.
[0018]
The shutter winding unit 22 includes a shutter box 23 integrally attached to an upper portion of the upper frame 10, and the wound shutter 20 is stored in the shutter box 23. Reference numeral 24 denotes a winding shaft for winding the shutter 20. The winding shaft 24 is driven by an electric drive unit that uses a servo motor described below as a drive source.
[0019]
FIG. 2 is an exploded perspective view showing the electric drive unit incorporated inside the winding shaft 24. The winding shaft 24 is a hollow pipe-shaped shaft. A motor unit 25 and a spring assembly 26 are incorporated inside the winding shaft.
[0020]
The spring assembly 26 includes a shaft 27, a take-up spring 28 wound around the shaft 27, and a pair of bearings 29a and 29b that rotatably support the shaft 27. To attach the shaft to the winding shaft 24, the bearings 29a and 29b may be fixed with screws.
[0021]
One end of the take-up spring 28 is fixed to the shaft 27, and the other end of the spring is fixed to the take-up shaft 24. Therefore, the take-up spring 28 urges the take-up shaft 24 in the opening direction of the shutter 20 by the torsional torque generated in the spring at all times. Thus, when the shutter 20 is manually opened, the shutter 20 can be easily opened.
[0022]
The motor unit 25 is unitized so that the servomotor, the speed reducer, and the brake can be easily incorporated into the winding shaft 24. FIG. 3 shows a longitudinal section of the motor unit 25.
[0023]
In FIG. 3, reference numeral 30 denotes a cylindrical case, in which a DC servomotor (hereinafter, simply referred to as a servomotor) 32 and a brake 33 are integrally accommodated. Reference numeral 34 denotes a speed reducer including a differential planetary gear mechanism.
[0024]
The rotating shaft 35 of the servomotor 32 is connected to an input shaft 36 of the speed reducer 34, and three planetary gears 37 mesh with the input shaft 36. These planetary gears 37 are also meshed with the outer sun gear 38 at the same time, so that the rotation of the input shaft 36 is reduced and transmitted to the sun gear 38 while rotating around the sun gear 38. The rotation of the sun gear 38 is transmitted to an output shaft 41 rotatably supported by a bearing 39. As shown in FIG. 2, a clutch 40 is connected to the output shaft 41. When the clutch 40 is engaged, the reduced rotation and torque are transmitted to the winding shaft 24 via the clutch 40. When the clutch 40 is disengaged, the shutter 20 can be manually opened and closed using the above-mentioned torsion torque of the winding spring 28.
[0025]
Next, FIG. 4 is a block diagram illustrating a configuration of the shutter opening / closing control device of the electric shutter according to the present embodiment.
In FIG. 4, reference numeral 42 indicates a shutter opening / closing control device. The shutter opening / closing control device 42 includes a control unit 44 including a microcomputer, and a servo driver 46 that drives the servo motor 32 based on a command from the control unit 44. The servo motor 32 incorporates an encoder 45 as a detector for detecting a position, and a pulse train output from the encoder 45 is fed back to the control unit 44, and the control unit 44 counts the pulse train, thereby controlling the shutter 20. The position can be detected.
[0026]
An operation switch 48 and a safety device 50 are connected to the control unit 44. The operation switch 48 is provided with an open switch, a close switch, and a stop switch. When signals from these switches are given to the control unit 44, the control unit 44 sends a forward rotation command, a reverse rotation command, and a stop command to the servo driver 46, respectively. Command a command. The safety device 50 is a device for detecting, when there is an obstacle in the window frame of the sash, by infrared rays and transmitting a stop command to the control unit 44.
[0027]
Hereinafter, the operation of the control unit 44 will be described with reference to the time chart of FIG. 5 and FIG.
FIG. 5A shows the stepwise reduction of the rotation speed of the servomotor 32 for closing the shutter 20, and FIG. 5B shows the stepwise increase of the rotation speed in the opening operation of the shutter 20. Indicates speed and deceleration. FIG. 6 is a diagram showing the relationship between the position of the shutter 20 and the speed when the speed is reduced.
[0028]
5A and 6, position pulses P0 to P6 are count values of a pulse train output from the encoder 45, and correspond to preset speed switching positions. Specifically, the position pulse P0 corresponds to the position where the shutter 20 is fully open, the position pulse P6 corresponds to the position where the shutter 20 is fully closed, and the position pulse P5 corresponds to the state in which the baseboard 21 at the lower end portion is in the process of closing the shutter 20. The position corresponds to the position where the sash is in contact with the lower frame 12 and the position where the baseboard 21 is separated from the lower frame 12 in the process of opening the shutter 20. The position pulses P1 and P2 correspond to positions where the shutter 20 approaches the fully opened position and decelerates to a step point in the process of opening, and the position pulse P4 decelerates immediately before P5 in the process of closing the shutter 20 and the position P5 in the process of opening. The position pulse P3 corresponds to the position where the speed increases to the steady speed in the process of opening the shutter 20.
[0029]
(1) Closing Operation First, when the closing switch of the operation switch 48 is turned on, the control unit 44 performs stepwise speed control of the servomotor 32 as shown in FIG.
In order to close the shutter 20, the initial speed of the servo motor 32 at the time of starting to unwind from the winding shaft 24 is a constant steady rotational speed N11. When this speed command is given to the servo driver 46, the low speed is maintained slowly. Then, the shutter 20 is closed.
[0030]
The control unit 44 can control the servo motor 32 to a rotational speed considerably lower than the steady rotational speed of the conventional AC motor, so that the reduction ratio of the speed reducer 34 can be made smaller than that of the conventional AC motor. It becomes possible. For this reason, the tooth contact noise in the speed reducer 34 can be suppressed.
[0031]
When the control unit 44 counts the position pulse P4 just before the skirting board 21 of the shutter 20 comes into contact with the lower frame 12, the control unit 44 sends a speed command to the servo driver 46 to reduce the rotation speed to the rotation speed N12. The rotation speed of the servo motor 32 is primarily reduced. Therefore, when the skirting board 21 of the shutter 20 starts to contact the lower frame 12, the skirting board 21 contacts the lower frame 12 smoothly, so that it is possible to prevent the skirting board 21 from hitting the lower frame 12 and making a noise.
[0032]
After the skirting board of the shutter 20 comes into contact with the lower frame 12 in this manner, the slats 18 begin to overlap with each other as the shutter 20 moves down, and the existing opening is closed. At this time, when the control unit 44 counts the position pulse P5, the control unit 44 sends a speed command to the servo driver 46 to reduce the rotation speed to the rotation speed N13, whereby the rotation speed of the servo motor 32 is secondarily reduced.
[0033]
The rotational speed N13 at which the secondary deceleration is performed is a speed at which the slats 18 are superposed very slowly, and almost no sound generated when the slats 18 rub against each other can be felt.
[0034]
Finally, when the shutter 20 is fully closed and the control unit 44 counts the position pulse P6, a stop command is sent to the servo driver 46, whereby the rotation of the servo motor 32 is stopped.
[0035]
Here, FIG. 7 is a diagram illustrating an example of a noise measurement result in the process of closing the shutter. FIG. 7A shows the measurement result of the electric shutter according to the present embodiment, and FIG. 7B shows the measurement result of the conventional electric shutter that closes at a constant speed. In FIG. 7, a section a corresponds to a section in which the baseboard contacts the lower frame and the slats overlap. As is clear from the comparison between FIG. 7A and FIG. 7B, when the shutter is closed at a constant speed, as in the case of the conventional electric shutter, the noise level is significantly increased due to the slats overlapping and rubbing. On the other hand, by performing the primary deceleration and the secondary deceleration as in the present embodiment, it can be seen that the slats can be completely closed and overlapped with almost no increase in the noise level.
[0036]
(2) When the opening switch of the opening operation switch 48 is turned on, the control unit 44 performs stepwise speed control of the servo motor 32 as shown in FIG. 5B.
The initial rotation speed N21 corresponds to the rotation speed N13 in the closing operation. When the control unit 44 gives this speed command to the servo driver 46, the shutter 20 starts opening very slowly at this rotation speed N21. At this time, the opening between the slats 18 spreads very slowly while the skirting board 21 of the shutter 20 arrives at the lower frame 12.
[0037]
During this time, the rotation speed N21 is maintained until just before the lower frame 12 of the skirting board 21 of the shutter 20 separates, so that it is possible to almost eliminate the sound generated when the slats 18 rub against each other.
[0038]
After that, when the baseboard 21 tries to leave the lower frame 12 and the opening between the slats 18 is completely opened, when the control unit 44 counts the position pulse P5, the control unit 44 rotates the servo driver 46. A speed command for increasing the speed to the speed N2 is sent, whereby the rotation speed of the servo motor 32 is primarily increased. Further, when the control section 44 counts the position pulse P4, the control section 44 sends a speed command for secondary deceleration to the rotation speed N23 to the servo driver 46. Then, when the position pulse P3 is counted, a speed command to increase the steady rotation speed N24 is issued to the servo driver 46.
[0039]
In this way, by gradually increasing the speed gradually until the rotation speed reaches the steady rotation speed N24, it is possible to prevent the generation of sound caused by the inertia of the shutter 20 when increasing the speed. Further, the control unit 44 can control the servo motor 32 to a steady rotation speed N24 which is considerably lower than the steady rotation speed of the conventional AC motor. , Can be suppressed.
[0040]
Then, immediately before the shutter 20 is completely opened, when the control unit 44 counts the position pulse P2, the control unit 44 sends a speed command for primary deceleration to the rotation speed N25 to the servo driver 46, and further, immediately before the fully open position. When the position pulse P1 is counted, the rotational speed N26 is secondarily reduced.
[0041]
Such two-step deceleration avoids a sudden stop operation of the shutter 20, and prevents generation of a sound in which the slats 18 rub against each other due to inertia. Finally, when the shutter 20 is fully opened and the control unit 44 counts the position pulse P0, a stop command is sent to the servo driver 46, thereby stopping the rotation of the servo motor 32.
[0042]
Here, FIG. 8 is a diagram illustrating an example of a noise measurement result in the process of opening the shutter. FIG. 8A shows the measurement result of the electric shutter according to the present embodiment, and FIG. 8B shows the measurement result of the conventional electric shutter that opens at a constant speed. In FIG. 8, a section b corresponds to a section from when the slat starts to open until the skirting board separates from the lower frame. 8 (a) and 8 (b), when the shutter is opened at a constant speed like a conventional electric shutter, the noise level becomes remarkable due to the sound of the slats overlapping and rubbing when starting to move. On the other hand, as shown in this embodiment, by performing the primary speed increase and the secondary speed increase in accordance with the progress of the movement of the slat, the opening between the slats hardly increases in noise level. Then, it can be seen that the noise level reaches the full open state without increasing the noise level.
[0043]
【The invention's effect】
As is apparent from the above description, according to the present invention, the noise at each stage in the flow of the series of opening and closing of the shutter is reduced as a whole, and the operating noise of the motor and the speed reducer and the slat of the slat are reduced. Overlapping rubbing noise and the like can be suppressed, and a silent opening and closing operation of the shutter can be realized.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a sash to which an electric shutter according to an embodiment of the present invention is applied.
FIG. 2 is an exploded perspective view of an electric drive unit of the electric shutter.
FIG. 3 is a sectional view of a motor unit used in the electric drive unit.
FIG. 4 is a block diagram of a control unit of the electric drive unit.
FIG. 5 is a time chart of a rotation speed control of a servo motor in a shutter opening / closing operation.
FIG. 6 is a diagram showing a correspondence relationship between a position of a shutter and a rotation speed.
FIG. 7 is a diagram illustrating an example of a noise measurement result in a shutter closing operation.
FIG. 8 is a diagram illustrating an example of a noise measurement result in a shutter opening operation.
[Explanation of symbols]
Reference Signs List 10 Upper frame 12 Lower frame 13 Inner sash 14 Outer sash 15 Screen door 16 Electric shutter 18 Slat 20 Shutter 21 Skirting board 23 Shutter box 25 Motor unit 26 Spring assembly 30 Case 32 DC servo motor 34 Reduction gear 44 Control unit

Claims (3)

In an electric shutter that electrically opens and closes a shutter having an opening for ventilation and lighting between slats,
A servomotor that rotationally drives a winding shaft that winds the shutter,
A speed reducer that reduces the rotation of the servo motor and transmits the rotation to the winding shaft;
Servo motor speed control means for increasing or decreasing the rotation speed of the servo motor in a stepwise manner according to the preset opening / closing position of the shutter,
An electric shutter characterized by comprising: In the closing operation of the shutter, the servo motor speed control means performs primary deceleration at a position immediately before the lower end of the shutter reaches the lower frame of the sash, and further, when the lower end of the shutter reaches the lower frame. 2. The electric shutter according to claim 1, wherein secondary deceleration is performed at the same time. In the opening operation of the shutter, the servo motor speed control means keeps the minimum speed until the lower end of the shutter separates from the lower frame of the sash, and increases the speed gradually from the position where the lower end of the shutter leaves the lower frame. 2. The electric shutter according to claim 1, further comprising performing stepwise deceleration immediately before winding of the shutter is completed.

Images