JPS6058850B2 - vacuum cleaner - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vacuum cleaner.

Generally, in a vacuum cleaner, the dust collection power decreases as the amount of dust collected increases or as the load on the electric blower increases due to the type of floor surface. Conventionally, the input of the electric blower is controlled by a motor control circuit including a control element such as a triac, but this requires manual operation of a variable resistor regulator connected to the motor control circuit. Therefore, each time, it is necessary to return to the vacuum cleaner main body and perform the cleaning, which is troublesome. Also, since it is a manual operation, it is completely useless unless you know how to use it. For this reason, a device with a function that allows pressing the hand switch on the suction hose side, generating pulses at a fixed period during the pressing time, and selecting various modes depending on the number of pulses is being considered. .

In this case, since the pulse width is constant, the operation timing of the hand switch for selecting each mode is constant.
Similar selections must be made for frequently used modes and less frequently used modes. Therefore,
Modes that are frequently used in each household must be selected with great care, resulting in low operability.
The present invention has been made in view of the above points, and can extend the selection time for a mode that is frequently used by the user among selectable modes, thereby improving operability. The purpose is to obtain a vacuum cleaner.

An embodiment of the present invention will be explained with reference to FIGS. 1 to 7.

First, FIGS. 1 and 2 schematically show a vacuum cleaner. An electric case 1 and a dust case 2 are detachably connected by a clamp 3. A suction port 4 is formed on the front surface of the dust case 2, and a filter unit 5 is installed inside. An electric blower 6 is installed inside the electric case 1, a ventilation hole 8 is formed in the front surface 7, and a cover 9 is detachably attached to the lower part of the front surface 7. As a result, a suction air passage 10 for collecting dust is formed between the exhaust side of the dust case 2 and the suction side of the electric case 1. Next, as shown in FIG. 3, the cover 9 attached to the front surface 7 of the electric case 1 is provided with a mesh filter 11 facing the ventilation hole 8 located at the lowest position.

A fixed plate 12 is screwed to the lower part of the front surface 7 of the electric case 1, and a movable plate 13 is attached to the fixed plate 12 with a spring 15.
It is attached so as to be rotatable about the hinge 14 while being biased in the direction of separation by. A permanent magnet 16 is fixed to the fixed plate 12, and a magnetic sensing element 17 is fixed to the movable plate 13. Further, an adjustment screw 18 for adjusting the pressure of the spring 15 is screwed into the movable plate 13, an adjustment hole 20 closed by a stopper 19 is formed in the cover 9 facing the adjustment screw 18, and further, The fixed plate 12 supports the movable plate 13.
An adjustment screw 21 is screwed together to adjust the facing distance between the two. Then, the permanent magnet 16 and the movable plate 13 inside the cover 9
A sensor 23 is configured by the magnetic sensing element 17 held in the air and the amplifier 22 to detect the amount of air sucked in and generate a signal corresponding to the amount of air (see FIG. 6). In addition, as shown in FIGS. 4 and 5, there is a suction hoe.

A hand switch 26 is provided on the grip tube 25 of the seat 24. This hand switch 26 has opposing contacts 27 and 28.
and a knob 31 biased by a spring 29 and a leaf spring 30. Contact points 27 and 28 are commercially available suction hose 2
It is connected to the command unit 32 via two J piano wires installed inside the 4. The command unit 32, as shown in FIG.
A rectifying diode D1, the secondary side of the transformer T, a resistor R, and a photodiode D2 are connected in series to 7 and 28, and a smoothing capacitor C is connected between the diode D1 and the resistor R. A phototransistor Tr is provided corresponding to the photodiode D2. A synchronous circuit 52 is connected to this phototransistor Tr,
This synchronous circuit 52 is connected to a counter 3 via a gate circuit 35.
3 and a decoder 40 are connected in sequence. Further, an oscillation circuit 34 is connected to the synchronous circuit 52, a pulse wave control section 51 is connected to the oscillation circuit 34, and a period setting device 49 and a selector 50 are connected to the pulse wave control section 51. There is. A manual control section 36 is then provided in parallel with the sensor 23.

This manual control section 36 is for setting the output power to H, L, and S. In addition, the triack control circuit 37
A motor control circuit 39 including a triax 38 and a triax 38 is provided for controlling the input of the electric blower 6. Thus, a decoder 4 distributes the output of the counter 33.
0, and a mode switching circuit 41 whose switching operation is controlled by a signal from the decoder 40.

This mode switching circuit 41 inputs signals a'''', b'''', and c'''' from the decoder 40, respectively, and inputs signals a-a'', b--
Switch ``Sa, Sb, S'' that conducts between ``b'', cmc''
c and the output d″ from the 0R circuit 42, and d−d″
It consists of a switch Sd that conducts between the two. The input side of the switch Sa is connected to the sensor 23, and the switches Sb and S
c and Sd are connected to the output sides H, L, and S of the manual control section 36, respectively. H indicates Higtl mode, L indicates Fat W mode, and S indicates StOp. Furthermore, a mode display section 43 is provided. This mode display section 43 receives the output of the decoder 40 and displays automatic mode display A, modes H and L, and its input side is connected to the decoder 40 along with the 0R circuit 42.
It is connected to the. Next, a power supply unit 44 is provided which is connected to the AC power supply together with the primary side of the transformer T.

This power supply unit 44 has a DC power supply 1 on the output side of the low voltage circuit 45.
46 is connected, and a DC power source 47 is connected via a switch output circuit 48. DC power supply 146
is the manual control section 36 and the mode switching circuit 4.
1 and the mode display section 43, and the DC power source ■
Reference numeral 47 operates the motor control circuit 39 and the sensor 23. In such a configuration, the hand switch 26 becomes ON each time the knob 31 is pressed, and therefore, an output corresponding to the time to turn ON is outputted to the counter 33 as a mode command signal.

That is, while the gate circuit 35 is open, the oscillation circuit 34
A pulse is output from to the counter 33. The oscillation circuit 34 outputs four pulses repeatedly, and the period setter 49 sets the period t of the four pulses that are repeatedly output as shown in FIG. Therefore, in the case of the first pulse, the signal a'' is input to the switch Sa to make a-a'' conductive, and in the case of the second pulse, the signal b''''
is input to switch Sb to make b-b' conductive,
In the case of the third pulse, the signal C"" is input to the switch Sc to establish continuity between cm and cm. Therefore, when the switch Sa is turned ON, the motor control circuit 39 turns on the electric blower according to the output of the sensor 23. 6. At this time, the movable plate 13 moves to the hinge 1 according to changes in the intake air volume.
4, and the output of the magnetic perturbation element 17 changes, thereby automatically controlling the input of the electric blower 6 according to the load. When the switch Sb is set to ON, the H output of the manual control unit 36 is input to the motor control circuit 39, and the input to the electric blower 6 is increased. When the switch Sc is turned ON, the L output of the manual control unit 36 is input to the motor control circuit 39, and the electric blower 6 is driven by a small output. In this way, the mode switching circuit 41 selectively connects the output of the sensor 23 or the manual control section 36 to the motor control circuit 39, but in this connected state, the mode display section 43 receives the output of the decoder 40 and displays A, Displays either H or L mode. Further, the counter 33 is a quaternary number obtained by adding the number of 0FF positions to the three modes A, H, and L, for example, 0FF-A (
Automatic) - H (large input) - L (small input).

That is, after switching to the L mode, the hand switch 26
Press and hold for a long time to receive the fourth pulse from the oscillation circuit 34 on the counter 3.
3, the output of the decoder 40 is the mode switching circuit 4.
1 is not input. That is, both the output of the sensor 23 and the output of the manual control section 36 are connected to the motor control circuit 39.
is not output. At this time, the output of the decoder 40 is not output to the mode display section 43 or the 0R circuit 42 either. As a result, the output d'' of the 0R circuit 42 is input to the switch Sd, the output S of the manual control section 42 is input to the switch output circuit 48 via d-d'', and the switch output circuit 48 is set to 0FF. becomes. As a result, the supply of operating power from the DC power source 47 to the sensor 23 and motor control circuit 39 is cut off, and the electric blower 6 is completely stopped. In this way, it is possible to use mode A in which the input to the electric blower 6 is automatically controlled according to the load, and mode H in which the electric blower 6 is driven with a large input by the output of the manual control section 36. You can use mode L to drive with a small input.

Furthermore, these modes can be freely switched at hand using the hand switch 26, resulting in good operability.
Further, although the hand switch 26 has multiple functions, it can be connected to the command section 32 with only two piano wires, and therefore, the suction hose 24 can also be an inexpensive commercial item. Next, the period t of the pulse is set by the period setter 49, and the selector 50 is a type of switch, and selects an arbitrary number of pulses and widens the width of the pulse.

In the state shown in FIG. 6, the selector 50 is set to position 1, and the width of the first pulse is widened as shown in FIG. In this way, the output of the oscillation circuit 34 passes through the synchronization circuit 52, the gate circuit 35, and the counter 3.
3. Input to decoder 40. As mentioned above, when the counter 33 receives one pulse, the switch Sa
The input of the electric blower 6 is controlled by the output of the closing sensor 23, but if this mode of use is the most frequent, the width of the first pulse should be increased as shown in FIG. Therefore, there is sufficient margin for the 0N and 0FF operations of the hand switch 2-6. If the mode command is frequently specified by the second or third pulse, it is also possible to set the selector 50 to position 2 or 3 to widen the width of the arbitrary pulse. Moreover, although the timing at which the hand switch 26 is pressed is not constant, the synchronization circuit 52 always sends the first pulse to the oscillation circuit 34.
The timing is set so that the signal is input to the gate circuit 35 from the beginning.

Since this invention is configured as described above, the input of the electric blower can be automatically controlled according to the load, and
It can be used manually to freely control the input of the electric blower, and it is also extremely easy to switch between automatic and manual modes and to change modes in manual control by changing the length of time the hand switch is closed. ,
The pulse wave control unit can select the arbitrary number of pulses oscillated from the oscillation circuit and widen the pulse width.
Therefore, when the final mode is specified by outputting pulses with a wider width, the hand switch can be turned OFF with enough time to make the operation easier, especially in households. By widening the pulse width of the pulse corresponding to the frequently used mode, the mode can be easily selected, and the settings for that mode can also be easily made.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the overall configuration of the first embodiment of the present invention, Fig. 2 is a partially cutaway side view, and Fig. 3 is a partial view showing the structure of the sensor. FIG. 4 is an enlarged longitudinal side view, FIG. 4 is a side view showing part of the suction hose, FIG. 5 is an enlarged longitudinal side view of the hand switch, FIG. 6 is a block diagram showing the electric circuit, and FIG. is a timing chart showing the output of the oscillation circuit. 6... Electric blower, 23... Sensor,
24...Suction hose, 26...Hand switch,
32... Command unit, 34... Oscillation circuit,
36...Manual control section, 39...
・Motor control circuit, 41...Mode switching circuit,
51...Pulse wave control section.

Claims (1)

[Claims] 1. A motor control circuit that controls the input of the electric blower, a sensor that outputs an automatic mode signal that continuously changes the input of the electric blower according to an increase or decrease in the amount of absorbed air, and an OFF state of the input of the electric blower. A manual control unit that outputs signals of multiple modes that change discontinuously, and a hand switch for turning the suction hose on and off.
A command section outputs a mode command signal corresponding to the length of time, and a pulse corresponding to the length of the output is output as a mode switching signal during output of the mode command signal from the command section, with multiple pulses as one cycle. and a plurality of switches, the sensor and the manual control unit being connected to the input side, the output side being connected to the motor control circuit, and selectively switched to a closed circuit by the mode switching signal. A vacuum cleaner comprising a switching circuit and a pulse wave control section that selects an arbitrary pulse in one cycle output from the oscillation circuit and widens the pulse width.