JPS6366209B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vacuum cleaner using a dust bag as a dust collector.

Conventional configuration and its problems Conventionally, vacuum cleaners that use a dust bag as a dust collector have a structure that stops the rotation of the electric blower when it detects that the dust bag has been forgotten to be attached or is not attached properly. It had been proposed. In this case, a switch mechanism is provided that is connected in series with the electric blower, and when the dust bag is properly attached, the switch is in a conductive state, and when it is improperly attached, the switch is disconnected and the current is not flowing. It was designed to stop the rotation of the electric blower by preventing the flow of air. Furthermore, in cases where a switch mechanism is provided as part of the remote control circuit, the switch mechanism is electrically disconnected when a dust bag is improperly attached.

Therefore, with this kind of configuration, the mechanism and switches that detect whether or not the dust bag is attached are usually
It needs to be installed near the dust collection chamber, and as a result, fine dust adheres to the switch contacts and causes poor continuity, making it impossible to use it as a vacuum cleaner even if the dust bag is properly installed. was occurring. In other words, there was a problem in which the function of the vacuum cleaner itself was impaired because of the safety device, which would never occur to most users, such as forgetting to attach the dust bag. .

Purpose of the Invention The present invention solves these conventional problems. Even if the switch mechanism of the detection part that detects the presence or absence of a dust bag and whether it is installed properly or incorrectly has a contact failure, the vacuum cleaner can still function. It is made available for use.

Structure of the Invention The present invention provides a vacuum cleaner with a device for detecting a forgotten dust bag, and the switch mechanism of this device electrically disconnects the contact when the dust bag is properly attached, and when the dust bag is incorrectly attached. The contacts become electrically conductive only when the dust bag is attached, activating the motor stop circuit and preventing the motor from rotating, thereby preventing the motor from stopping when the dust bag is properly attached. .

DESCRIPTION OF EMBODIMENTS An embodiment will be described below with reference to FIGS. 1 to 7.

1 is the main body of a vacuum cleaner with a built-in electric blower 2, and a dust collection chamber 4 with an opening 3 provided above is formed in the front. Reference numeral 5 denotes a dust collection lid detachably provided in the opening 3, which is brought into close contact with the dust collection chamber packing body 6 fixed to the main body 1 to prevent air leakage, and is secured by a buckle device 7 provided on the main body 1. I'm trying to stop it. Reference numeral 8 denotes a front wall of the main body 1 forming the dust collection chamber 4, and a front cover 9 is attached to the front outside of the front wall 8 to close the front wall 8.
An air intake packing 11 fitted into a packing attachment hole 10 formed in the front lid 9 is communicated with a suction port 12 formed integrally in the front cover 9 to introduce dust-containing airflow into the dust collection chamber 4. Reference numeral 13 denotes a dust bag that collects dust and allows only air to pass through to the rear, and is connected to a bag mounting plate 14 made of hard paper or synthetic resin by adhesive or the like, and a dust suction port 15 is opened in the bag mounting plate 14. It is arranged so that it communicates with the vent hole 16 of the intake packing 11. Reference numeral 17 denotes guide ribs provided in the dust collection chamber 4, which are formed on both sides of the intake packing 11 in a substantially L-shape facing toward the intake packing 11, and the bag mounting plate 14 is supported between the guide ribs 17, 17. and is pressed against the intake packing 11. Reference numeral 18 denotes a support rib, which is provided for the purpose of supporting the bag mounting plate 14 more reliably between the guide ribs 17, 17. A switch 19 is made of an elastic material such as rubber and is fixed to the front wall 8 between the guide ribs 17, and communicates the space between the front wall 8 and the front lid 9 with the dust collection chamber 4. 20 is a switch lever provided between the front lid 9 and the front wall 8, the shaft portion 21 of which is rotatably supported by a bearing 22 of the front lid 9 and a support plate 23;
A part of it passes through the communication hole 24 of the switch packing 19 and projects into the dust collection chamber 4, and
The operating lever 25 is also integrally formed with a switch plate 26.
is in contact with. Reference numeral 27 denotes a switch mounting plate in which the switch plate 26 is fixed by caulking with rivets 28, and a contact 29 which contacts the switch plate 26 and is electrically conductive is fixed by caulking. A lead wire 30 is connected to detect the presence or absence of electrical connection. A through hole 31 is provided in the switch mounting plate 27,
The operating lever 25 of the switch lever 20 is passed through the through hole 31, and the switch plate 26 is inserted through the through hole 31.
is made of an elastic conductive material so that conduction and disconnection with the contact point 29 can be achieved by the operation of the switch lever 20. When the bag mounting plate 14 is inserted into the guide rib 17, the switch lever 20, which is protruded into the dust collection chamber 4 from the communication hole 24 of the switch packing 19, is rotated around the shaft portion 21 toward the front lid 9 side. The operating lever 25 operates the switch plate 26.

In the above configuration, when replacing the dust bag 13, open the dust collection lid 5, pull out the dust bag 13 with accumulated dust, and replace it with a new dust bag 13 from the guide rib 17.
It is inserted into. Now, regarding the case where the user accidentally does not insert the dust bag 13 into the guide rib 17 or forgets to attach the dust bag 13 and uses the vacuum cleaner, the circuit configuration is shown in FIG. Explain. Power is supplied to the phase control circuit 33 through the power supply circuit 32, and a signal is applied from the phase control circuit 33 to the gate of the bidirectional thyristor 34 connected in series with the electric blower 2, so that current flows through the bidirectional thyristor 34. The current flows through the electric blower 2 to cause the electric blower 2 to start operating. A motor stop circuit 35 is connected to the phase control circuit 33, and when the motor stop circuit 35 is activated, it is controlled by a signal sent from the phase control circuit 33 to the bidirectional thyristor 34, and the bidirectional thyristor 34 receives a current. The electric blower 2 stops flowing and the operation of the electric blower 2 is stopped. The operation of the motor stop circuit 35 is performed by conducting and disconducting the switch plate 26 and the contact 29. When the dust bag 13 is inserted correctly, the switch plate 26 and the contact 29 are disconnected. Therefore, the motor stop circuit 35 is not activated. In other words, when the bag mounting plate 14 is correctly inserted into the guide rib 17, the switch lever 20 that was protruding from the switch packing 19 toward the dust collection chamber 4 will be
The bag mounting plate 14 presses and rotates the front lid 9 side, and as a result, the operation lever 25 is moved toward the switch plate 2.
By pressing 6, the switch plate 26 is bent and disconnected from the contact 29. In this state, the motor stop circuit 35 does not operate, so the electric blower 2 can rotate.

Next, if the bag mounting plate 14 is not properly attached or if the dust bag 13 is forgotten to be attached, the switch lever 20 is pushed back toward the dust collection chamber 4 side by the elasticity of the switch plate 26, and the switch lever 20 is The contact point 29 comes into contact with the contact point 29 and becomes electrically conductive. In this state, the motor stop circuit 35 is activated and the operation of the electric blower 2 is stopped. Also,
In the above configuration, if the bag mounting plate 14 is incorrectly inserted, the electric blower 2 will not operate, but the switch lever 20 will operate correctly by reinserting the bag mounting plate 14 while keeping the switch on the main body 1 in a conductive state. If this is done, the motor stop circuit 35 will not operate, and the electric blower 2 will be operated, so it is very easy to judge whether the insertion of the bag mounting plate 14 is good or bad. Further, since vacuum cleaners inhale dust, dust may adhere to the contacts of switches, resulting in poor contact, making the vacuum cleaner unusable. This tendency is particularly strong when a switch or the like is installed near the dust collection chamber 4. However, the dust bag detection device 36 is originally a device that hardly functions, and is provided just in case, and if the dust bag 13
Even if dust is inhaled without cleaning, it is possible to use the vacuum cleaner again as long as the dust collection chamber 4 is cleaned, although this will be a troublesome task for the user. Therefore, it is preferable that a device such as the dust bag detection device 36, which has a structure that prevents the user from using it incorrectly, be able to be used as a vacuum cleaner even if the device is destroyed, so it should be used normally. At times, the switch plate 26 and the contacts 29 are separated so that the electric blower 2 can be operated, and even if dust or the like adheres to the contacts and the contact becomes poor, it can still be used as a vacuum cleaner. .

Effects of the Invention As described above, according to the present invention, if the dust bag is installed incorrectly or if you forget to attach it, the rotation of the electric blower can be reliably stopped. Even if dust enters the forget detection device and adheres to the contacts of the switch mechanism, causing electrical continuity, the original purpose of the vacuum cleaner, which is to suck in dust, will not be impaired, and it will not work as before. This has the effect of solving the problem of the vacuum cleaner becoming unusable due to the safety device.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of a vacuum cleaner according to an embodiment of the present invention, FIG. 2 is a perspective view of the dust bag attachment part of the vacuum cleaner, and FIG. 3 is a sectional view of the switch mechanism. 4 is a sectional view showing the operating state of FIG. 3, FIG. 5 is a perspective view of the dust bag, FIG. 6 is a sectional view of the main part of the switch mechanism, and FIG. 7 is a circuit diagram. 2... Electric blower, 4... Dust collection chamber, 13... Dust bag, 33... Phase control circuit, 35... Motor stop circuit, 36... Dust bag detection device.

Claims (1)

[Claims] 1 A removable dust bag in a dust collection chamber, a control circuit connected in series to an electric blower, a motor stop circuit connected to this control circuit, and a dust detection device electrically connected to this motor stop circuit. This detection device is equipped with a switch mechanism that electrically disconnects the dust bag when it is properly attached, and connects it when it is improperly attached to activate a motor stop circuit.