JPH06142425A - Automatic winder for filter cloth of air cleaner - Google Patents

Abstract

PURPOSE:To normally keep the length of a filter cloth wound one time nearly constant by controlling the drive time of a motor for winding a filter cloth by a switch opened and closed according to the outer diameter of the filter cloth wound onto a roll for winding a filter cloth. CONSTITUTION:Base ends 22 of an arm 21 are freely rotatably pivoted on the outer casing of a dust collector and a free part 23 is oppositely equipped to the outer periphery of a filter cloth 9 wound onto a winding roll 11 and a magnet 24 is fixed to the side of the free part 23. Simultaneously the 1st and 2nd contactless switches 25a, 25b each are separatalong the trace of the axis of a magnet 24 provided on the above-mentioned according to a change in the outer peripltphey to fix item to the outer casing of the dust collector. When the corresponding one of the switches 25a, 25b is closed by the magnet 29, a timer circuit is controlled to adjust the actuation time of a motor for winding a filter cloth. Thus, the length of filter cloth wound one time is made nearly constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic filter cloth winding device for an air cleaner, and more particularly to an automatic filter cloth winding device for an air cleaner in which the filter cloth is wound around a winding roll.

[0002]

2. Description of the Related Art FIG. 4 and FIG.
No. 76716 discloses an air purifier, 1 is a dust collector outer casing, 2 is its opening / closing door, 3 is its handle, 4 is an inlet provided in the door 2, and 5 and 6 are charging devices 7, respectively. Electrode plate and electrode wire, 8 is a wire mesh, 9 is a filter cloth extending along the front surface of the wire mesh 8, 10 is a roll of the filter cloth 9, 11 is a filter cloth take-up roll, and 12 is a filter cloth take-up motor , 13 is a blower, 14 is a motor thereof, 15 is a belt, 16 is an outlet, and 17 is a high-voltage generator for applying a high voltage to the charging device 7. In such an air cleaner, the filter cloth winding motor 12 is driven by a timer circuit (not shown) for a fixed period of time when a periodic winding command is applied.

[0003]

However, in the above-described automatic filter cloth winding device for an air cleaner, the outer diameter of the filter cloth wound on the winding roll 11 depends on the progress of winding the filter cloth 9. The winding roll 1
When 1 is rotated by the filter cloth winding motor 12 for a certain period of time to wind up the filter cloth 9, the length of the filter cloth to be wound is gradually increased as the above-mentioned outer diameter is increased, which is uneconomical. there were.

The present invention is designed to eliminate the above drawbacks.

[0005]

SUMMARY OF THE INVENTION An automatic filter cloth winding device for an air cleaner according to the present invention comprises a roll-shaped filter cloth or a means for detecting the outer diameter of a filter cloth wound around a filter cloth winding roll, and the above-mentioned external means. It is characterized by comprising means for changing the operating time of the filter cloth winding motor according to the change of the diameter.

The means for changing the operating time of the filter cloth winding motor is a relay contact for cutting off the power supply circuit of the filter cloth winding motor, a transistor for energizing the relay contact driving relay, and a driving power source for this transistor. And a time constant circuit consisting of a resistor and a capacitor interposed between the capacitor and a means for varying the voltage applied to the capacitor according to the change in the outer diameter of the filter cloth.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIGS.
The base end 22 of the arm 21 is rotatably supported on the dust collector outer casing 1, and the free end portion 23 is brought into contact with the outer periphery of the filter cloth 9 wound around the winding roll 11, so that the free end portion 23 is provided. The magnet 24 is fixed to the side surface of the magnet, and the first and second proximity switches 25a and 25b are respectively arranged from the inner side along the axis trace of the magnet 24 provided on the arm 21 that is displaced according to the change in the outer diameter. The dust collector outer casing 1 is separated from the outside and fixed to the dust collector casing 1, and the first and second proximity switches 2 are fixed by a magnet 24.
When the corresponding one of 5a, 25b is closed, the timer circuit 26 is controlled, which allows the operating time of the filter cloth winding motor 12 to be adjusted.

FIG. 3 shows the timer circuit 26, and 27
Is a relay having a normally-closed contact inserted in series with the power supply circuit of the filter cloth winding motor 12, 28 is a cascade-connected transistor for connecting the relay 27 to the power supply via the collector and emitter, and 29 to 32 are the power supplies , 33 and 34 are variable resistors and capacitors for determining the time constant inserted between one of the resistors, for example, the voltage dividing point V by the resistor 29 and the base of the transistor 28. Then, the first proximity switch 25a is configured to short-circuit two of the resistors, for example, the resistors 31 and 32, so that the voltage at the voltage dividing point V can be minimized. Is one of the above resistors,
For example, the resistor 32 is short-circuited so that the voltage at the voltage dividing point V can be set to an intermediate value.

Since the automatic filter cloth winding device for the air purifier of the present invention has the above-described structure, the base potential of the transistor 28 is not charged in the capacitor 34 even when a voltage is applied to the timer circuit 26. Below the operating voltage,
Therefore, the relay 27 is not driven, and its normally-closed contact remains closed. Therefore, when voltage is applied to the filter cloth winding motor 12, the filter cloth winding motor 12 is driven for a predetermined time.

However, since the base potential of the transistor 28 rises to the operating voltage after a time determined by the variable resistor 33 and the capacitor 34 and the potential of the voltage dividing point V, the transistor 28 becomes conductive and the relay 2
7 is urged to open its normally closed contact, and the winding of the filter cloth 9 is stopped.

In this way, the filter cloth winding time for each fixed period is determined according to the time constant determined by the variable resistor 33 and the capacitor 34 and the potential of the voltage dividing point V.

After the power source applied to the timer circuit 26 is cut off, the charge of the capacitor 34 is discharged through the resistor 30 with the lapse of time, and the base potential of the transistor 28 becomes lower than the operating potential. It is provided to drive the filter cloth winding motor 12.

At the beginning of winding the winding roll 11 of the filter cloth 9, the winding diameter is small, and the first proximity switch 25a is close to the magnet 24 and is closed. In this state. Since the resistors 31 and 32 are short-circuited and the voltage at the voltage dividing point V becomes the minimum value, when the voltage is applied to the timer circuit 26, the transistor 2
The time for which 8 becomes conductive becomes maximum, and the winding length of the filter cloth 9 becomes a predetermined length.

Next, the arm 21 is displaced as the winding of the filter cloth 9 progresses, the magnet 24 separates from the first proximity switch 25a, and approaches the second proximity switch 25b to close it. If this happens, the resistance 3
Only 2 is short-circuited and the voltage at the voltage dividing point V becomes an intermediate value larger than the previous value. In this case, the time it takes for the capacitor 34 to be charged and the base potential of the transistor 28 to rise to the operating potential becomes shorter than the previous time, and the winding time of the filter cloth 9 becomes shorter accordingly.

When the winding of the filter cloth 9 further progresses and both of the first and second proximity switches are not closed by the magnet 24 and the state shown by the solid line in FIG. 1 is reached, the value of the voltage dividing point V is obtained. Is the maximum value, and the winding time of the filter cloth 9 is the shortest.

[0017]

As described above, according to the automatic filter cloth winding device for the air cleaner of the present invention, the filter cloth 9 is wound even if the outer diameter of the filter cloth wound around the winding roll 11 is increased. The length can be kept almost constant all the time, and there is a great advantage that it is extremely economical.

[Brief description of drawings]

FIG. 1 is an explanatory view of an automatic filter cloth winding device for an air cleaner of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an explanatory diagram of a timer circuit in the automatic filter cloth winding device of the air cleaner of the present invention.

FIG. 4 is a front view of a conventional air cleaner.

FIG. 5 is a vertical sectional side view for explaining an automatic filter cloth winding device of a conventional air cleaner.

[Explanation of symbols]

 1 Dust collector outer casing 2 Open / close door 3 Handle 4 Inlet port 5 Electrode plate 6 Electrode wire 7 Charging device 8 Wire mesh 9 Filter cloth 10 Roll-shaped filter cloth 11 Winding roll 12 Filter cloth winding motor 13 Blower 14 Motor 15 Belt 16 Blowing Outlet 17 High-voltage generator 21 Arm 22 Base end 23 Free end 24 Magnet 25a Proximity switch 25b Proximity switch 26 Timer circuit 27 Relay 28 Transistor 29 Resistor 30 Resistor 31 Resistor 32 Resistor 33 Variable resistor 34 Capacitor

Claims (2)

[Claims] 1. A means for detecting the outer diameter of a roll-shaped filter cloth or a filter cloth wound on a filter cloth winding roll, and a means for changing the operating time of a filter cloth winding motor according to the change in the outer diameter. An automatic filter cloth winding device for an air purifier characterized by being formed. 2. A means for changing the operation time of the filter cloth winding motor, a relay contact for cutting off a power supply circuit of the filter cloth winding motor, a transistor for activating the relay contact driving relay, and a transistor for activating the relay contact driving motor. A time constant circuit consisting of a resistor and a capacitor inserted in the drive power supply,
2. The automatic filter cloth winding device for an air cleaner according to claim 1, further comprising means for varying the voltage applied to the condenser according to a change in the outer diameter of the filter cloth.