JPS6058848B2 - 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 triax, 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 main body of the vacuum cleaner, which is troublesome. Also, since it is a manual operation, it is completely useless unless you know how to use it. This invention was made in view of these points. When the intake air volume decreases due to load fluctuations, the input of the electric blower is automatically increased to restore the dust suction capacity. The object of the present invention is to provide a vacuum cleaner that can be used in any manner that can be set manually, regardless of the type of surface, and in which the mode can be switched between automatic and manual modes by holding the suction hose at hand. be.

This invention provides a sensor that outputs a signal according to the intake air volume, which changes depending on the load, and inputs the output of the sensor to a motor control circuit to control the input of the electric blower according to the load. In addition, the output of the manual control section can be input to the motor control circuit to freely control the input of the electric blower, and furthermore, the manual control and automatic control can be switched freely from the suction hose at hand. It is configured so that it can be used. An embodiment of the present invention will be described based on FIGS. 1 to 6.
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. Accordingly, as shown in FIG. 3, the cover 9 attached to the front surface 7 of the electric case 1 has a mesh filter 11 facing the ventilation hole 8 located at the lowest position.
is formed.

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. A sensor 2 detects the intake air volume using a permanent magnet 16 in the cover 9, a magnetic sensing element 17 held on the movable plate 3, and an amplifier 22, and emits a signal corresponding to the air volume.
3 is constructed (see Figure 6). Also, Figures 4 and 5
As shown in the figure, a hand switch 26 is provided on the grip tube 25 of the suction hose 24. This hand switch 26 has opposing contacts 27 and 28, a spring 29, and a leaf spring 3.
The knob 31 is biased by 0. Contact 27, 2
8 is connected to the command unit 32 via two piano wires installed inside a commercially available suction hose 24. As shown in FIG. 6, the command section 32 has rectifying diodes D at the contacts 27 and 28.
1, the secondary side of the transformer T, the resistor R, and the photodiode D
2 are connected in series, a smoothing capacitor C is connected between the diode D1 and the resistor R, and a phototransistor Tr is provided corresponding to the photodiode 5 auto D2. This phototransistor Tr is connected to a counter 33. A manual control section 34 is then provided in parallel with the sensor 23.

This manual control section 34 controls the output power to H, L, S.
It is set to . In addition, the triack control circuit 3
A motor control circuit 37 is provided which includes a triax 36 and a triax 36 to control the input to the electric blower 6. A decoder 38 for distributing the output of the counter 33, and a mode switching circuit 39 whose switching operation is controlled by a signal from the decoder 38 are provided.

The mode switching circuit 39 inputs signals a'', b'', c'' from the decoder 38, and inputs signals a-a'', bb'',
Switches Sa, Sb, Sc.15 that conduct between cmc''
It consists of a switch Sd which inputs the output d'''' from the OR circuit 40 and conducts between d and d''.The input side of one switch Sa is connected to the sensor 23, and the switches Sb and Sc
, Sd are connected to the output sides H, L, and S of the manual control section 34, respectively.

H indicates High mode, L indicates LOW mode, S indicates StOp, and furthermore, a mode display section 41 is provided. This mode display section 41 receives the output of the decoder 38 and displays automatic mode display A, modes H and L, and its input side is connected to the 0R circuit 40.
It is also connected to a decoder 38. Next, a power supply unit 42 is provided which is connected to the AC power supply together with the primary side of the transformer T.

In this power supply section 42, a low voltage circuit 43 is connected to the DC power supply 1 on the output side.
44 is connected, and a DC power supply 45 is connected via a switch output circuit 46. DC power supply ■44
is the manual control section 34 and the mode switching circuit 3.
9 and the mode display section 41, and the DC power supply ■
Reference numeral 45 operates the motor control circuit 37 and the sensor 23. In such a configuration, the hand switch 26 turns ON each time the knob 31 is pressed once, and therefore, a pulse corresponding to the number of times the knob 31 is turned ON is outputted to the counter 33 as a mode command signal.

The decoder 38 distributes the signals from the counter 33 and outputs them to the mode switching circuit 39. That is, in the case of one pulse, input the signal a'''' to the switch Sa and
a'' is made conductive, in the case of 2 pulses, the signal b'''' is input to the switch Sb to make b-b'' conductive, and in the case of 3 pulses, the signal b'''' is inputted to the switch Sc and cmc'' is made conductive. Therefore, when the switch Sa is turned ON, the motor control circuit 37 controls the input of the electric blower 6 according to the output of the sensor 23. At this time, the movable plate 13 rotates around the hinge 14, and the output of the magnetic sensing element 17 changes, so the input of the electric blower 6 is automatically controlled according to the load.When the switch Sb is turned ON, the manual control section 34 An output of H is input to the motor control circuit 37, and the input of the electric blower 6 is increased.When the switch Sc is turned ON, an output of L of the manual control section 34 is input to the motor control circuit 37, and the input of the electric blower 6 is increased. In this way, the mode switching circuit 39 selectively connects the output of the sensor 23 or the manual control section 34 to the motor control circuit 37, but in this connected state, the mode display section 41 is Upon receiving the output of the decoder 38, 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 (auto)-H.
Changes from (large input) to L (small input). That is, L
After switching to the mode, turn on the hand switch 26 four times and input four pulses to the counter 33, and the decoder 38
The output of is not input to the mode switching circuit 39. That is, neither the output of the sensor 23 nor the output of the manual control section 34 is output to the motor control circuit 37. At this time, the output of the decoder 38 is not output to the mode display section 41 or the 0R circuit 40 either. As a result, the output d"" of the 0R circuit 40 is input to the switch Sd, the output S of the manual control section 34 is input to the switch output circuit 46 via d-d", and the switch output circuit 4
6 becomes 0FF. As a result, the supply of operating power from the DC power source 45 to the sensor 23 and motor control circuit 37 is cut off, and the electric blower 6 is completely stopped. In this way, mode A can be used to automatically control the input to the electric blower 6 according to the load, and mode H can be used to drive the electric blower 6 with a large input based on the output of the manual control section 34. 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.
Furthermore, 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. Since the present invention is configured as described above, it is possible to obtain a mode of use in which the input of the electric blower is automatically controlled according to the load based on the output of the sensor, and the input of the electric blower is controlled automatically using the output of the manual control section. Furthermore, it has effects such as switching between automatic control and manual control, and switching modes in manual control as well, such as being able to freely operate the mode at hand at the suction hose.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show one embodiment of the present invention; FIG. 1 is an exploded perspective view showing the overall configuration, FIG. 2 is a partially cutaway side view, and FIG. 3 is a structure of the sensor. Fig. 4 is a side view showing a part of the suction hose, Fig. 5 is an enlarged longitudinal side view of the hand switch, and Fig. 6 is a block diagram showing the electric circuit. .

6... Electric blower, 23... Sensor,
24... Suction hose, 26... Hand switch, 32... Command unit, 34... Manual control unit, 37... Motor control circuit, 39・
...Mode switching circuit.

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 intake air volume, and an OFF state of the input of the electric blower. a manual control section that outputs signals of a plurality of modes that are discontinuously changed; a mode switching circuit in which the sensor and the manual control section are connected to an input side, and an output side is connected to the motor control circuit; and a command section that outputs a mode command signal to the mode switching circuit in accordance with the number of operations of the hand switch of the suction hose, and the mode switching is performed by the mode command signal. Machine.