JPS6021730A - Electric cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A) Field of Industrial Application The present invention relates to a vacuum cleaner that uses a floor suction stem with a motor-driven rotating brush called a power head or power brush.

(Example) Conventional technology A vacuum cleaner with a power head is very effective for cleaning carpets, etc., but if the rotating brush becomes locked due to some reason, for example, a foreign object such as cloth gets caught in it, the normal drive
Since the rotating brush and the rotating brush are connected to each other by a belt, the belt and drive motor may slip, and the belt may be cut by the brush. In order to prevent this, conventionally a rotation speed detection device and a current breaker have been installed. However, the former method detects the rotation speed of the rotating brush and has a very complicated structure. In addition, the latter has a small current difference between when the rotating brush is locked and when it is not locked, making it difficult to set the operating current due to the accuracy of the current breaker, and is not practical when considering the current waveform due to sb and phase control.

(c) Object of the Invention The object of the present invention is to easily and accurately detect overload on a power head to prevent damage to the belt and burnout of the drive motor.

D) Structure of the Invention The present invention relates to a vacuum cleaner in which a motor-driven floor suction device with a rotating brush is connected to a vacuum cleaner body having a built-in suction motor via a pipe, a hose, etc. The present invention is characterized in that a drive motor current detection element is connected in series, and an overload notification circuit is provided which uses the output of the current detection element to notify overload of the rotating brush via a stain pressure comparison circuit.

e) Example The present invention will be described below with reference to embodiments shown in the drawings.

(1) is a vacuum cleaner body that has a built-in suction motor (2) and a dust collection section, and the main body includes a bellows-shaped flexible hose (3) with two core wires and a vibrator (5) with a cord +43. A rotary brush drive floor suction device (6) with a built-in rotary brush drive motor (6) and a rotary brush driven by the motor (
7) (hereinafter simply referred to as a floor suction device) is connected. A bent vibrator (8) provided at the end of the flexible hose (3)
A power control circuit for the rotary brush drive motor (6) and a control link for controlling the phase of the control circuit are installed in the hand control unit (9).

Next, the electric circuit shown in FIG. 2 will be explained.

The suction motor (2) is connected to the power source 43 in series with a bidirectional control rectifier C13 which uses the output from the first trigger circuit as a gate signal. In addition, a second bidirectional control rectifying element (151) which uses the output from the rotary brush drive motor (6) and the second trigger circuit I as a gate signal and a current detection resistor Kasumi are connected in series with the power supply [1:1]. Drive motor (6)
A voltage proportional to the current is drawn out from both ends of the resistor 1G.

This voltage is input to the first trigger circuit 0υ to generate a gate signal for the first bidirectional control rectifier 13 and the suction motor (2).
At the same time, it is also input to the voltage comparator circuit σ7).

Since the voltage across the current detection resistor increases or decreases depending on the load condition of the rotating brush, it is possible to detect any load condition by appropriately setting the reference voltage of the voltage comparison circuit ση. .

By connecting a notification circuit a8 that emits sound or light to the output side of the voltage comparison circuit α, abnormalities in the multi-rotation brush can be easily notified.

FIG. 6 shows another embodiment in which a rotary brush drive motor (6) and a power source are connected to the electric circuit of FIG. 2 via a relay switch a9. More specifically, the voltage comparator circuit r
A latch circuit 4 is provided between the latch circuit 17) and the notification circuit 1 second, and a relay drive circuit (2I) is interposed and connected between the output side of the latch circuit and the relay switch a9. Once the output of the voltage comparator circuit η becomes high level, the output of the latch circuit 4 remains high level until the main switch cl is turned off, regardless of the subsequent output. When a high-level output is input from the latch circuit (7) to the relay drive circuit (2I), the relay switch is turned OFF to stop the rotary brush drive motor (6) and also stop the suction motor (2). .

In this state, turn off the main switch (Q), inspect the rotating brush and remove any foreign matter, and then turn on the main switch (Q) again to start the rotating brush drive motor (6).
) and the suction motor [2] start rotating.

(f) Effects of the Invention Since the vacuum cleaner according to the present invention is constructed as described above, the load condition on the rotating brush can be easily detected, and maintenance and inspection of the rotating brush can be easily performed to prevent damage or drive of the rotating brush. Burnout of the motor can be prevented.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a vacuum cleaner embodying the present invention, FIG. 2 is an electric circuit thereof, and FIG. 3 is an electric circuit diagram of another embodiment. (1)... Vacuum cleaner body, (2)... Suction motor,
]6)...rotating brush drive motor, (7)...floor suction device with rotating brush, housing...first trigger circuit, function 3
...First bidirectional control rectifier, I...Second trigger circuit, 1151...Second bidirectional control rectifier, L
Current detection resistor, alcohol...notification circuit, [! I...Relay switch.

Claims (1)

[Scope of Claims] 1) In a vacuum cleaner body having a built-in suction motor, a motor-driven floor suction device with a rotating brush is connected via a pipe, a hose, etc., in series with the rotating brush drive motor. A vacuum cleaner characterized in that an overload notification circuit is connected to a drive motor current detection element and uses the output of the current detection element to notify an overload of the rotating brush via a stain pressure comparison circuit. 2. The vacuum cleaner according to claim 1, wherein the current detection element is provided with a motor protection circuit that cuts off power to the rotating brush drive motor when the multi-rotating brush is overloaded.