JPS5858091A - Garment dryer with drying sensor - 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 The present invention relates to a clothes dryer in which a component of a rotating drum also serves as an electrode member for detecting the drying state of clothes.

Conventional clothes dryers with dryness detection function use a temperature detection method that utilizes the temperature difference between the exhaust temperature during drying and room temperature, and an electrode is installed inside the rotating drum, and the clothes are brought into contact with this electrode.
There is an electrode method that detects the inter-electrode resistance, which changes depending on the degree of dryness of the clothing, and amplifies this to interrupt the circuit.

In general, the former temperature detection method involves installing electrodes inside the rotating drum so that the exhaust temperature changes depending on the amount and type of clothing, regardless of drying. However, the cost is high and the durability of the slider is poor, which poses problems in practical terms.

Furthermore, as shown in Japanese Patent Publication No. 54-39269, there is a method in which electrodes are attached to the inner peripheral plate of the drum, but the electrodes need to be provided at specific positions where they can easily come into contact with clothing. Here, there are two types of clothes dryers: floor-standing types and stand-mounted types, but in order to reduce the variety of products, types that combine the former and the latter are required by the market and are being manufactured. Became. Regarding this common method, when installed on a stand, it is common practice to place the floor-standing type in an inverted position in order to make it easier to put in and take out clothes and to operate the time switch. However, with the electrode method described above, if the main body is turned upside down, the position of the electrodes will be reversed, making it difficult for clothing to come into contact with the device during rotation, resulting in a decrease in dryness detection performance, making it difficult to put it into practical use. Ta.

The present invention was made in view of the above-mentioned conventional problems, and is as follows:
One embodiment thereof will be described based on the accompanying drawings. In Fig. 1, 1 is the main body of the clothes dryer, 2 is a rotating drum rotatably provided inside the main body, and 3 is a fan case provided behind the rotating drum 2. Inside, there is a fan for blowing air. Equipped with 4 rotatable. ) 51d: A drive motor, and a drum pulley 6 and a fanci are attached to the rotating shaft of this drive motor 5.

- A leaf is provided, and the power of the drum pulley 6 is transmitted to the rotating drum 2 via the V-belt 8 and to the fan 4 via the moving cover of the fan pulley 7 and the fan belt 9. Reference numeral 10 indicates a plurality of baffles provided in the rotating drum 2, which transfer and agitate the clothes in the rotating drum.

Further, the front surface of the rotating drum 2 is divided into a ring-shaped inner circumferential plate 11 and an outer circumferential plate 12 connected to the circumferential wall, and the inner circumferential plate 11 has a flange 11a formed on the inner circumferential part and has a clothes input port. and is fixed to the front surface of the main body 1 via an insulating member 13a.

The outer circumferential plate 12 is an insulating member provided to connect the fixed inner circumferential plate 11 with the front surface of the outer circumferential part 1, and is an insulating member 13a.
Similarly, the inner peripheral plate 11 is held.

Reference numeral 15 denotes a lid provided on the main body 1 so as to be openable and closable so as to cover the clothes input port, and 16 denotes an outer circumferential plate 1 of the rotary drum 2.
A heater case 17 is disposed in a space between the main body 1 and the front surface of the main body 1, and a heater 17 made of a semiconductor resistance element having positive resistance-temperature characteristics is housed inside the heater case. Reference numeral 18 denotes a plurality of through holes provided in the inner circumferential plate 11 facing the heater 17.

Here, the inner circumferential plate 11 and the outer circumferential plate 12 are made of conductive material 1.
By forming, for example, stainless steel material and forming an insulating space between the two using the bearing 14, the two electrode members constitute one hj of electrode members on the inner wall circumferential surface of the front surface of the rotary drum 2.

A gift 19 is fixed to the center of the rear wall of the rotating drum 2, and this is a bearing 2 fixed to the fan case 3.
It is rotatably supported by 0. Further, the fan case 3 is fixed within the main body 1 by a drum holder 21.

Here, not only the rotating drum 2 but also the shaft 19
, the bearing 20, the fan case 3, the drum holder 21, etc. are made of an electrically conductive material such as stainless steel, iron, etc. Therefore, the outer peripheral plate 12 is electrically connected to the main body 1. The inner peripheral plate 11 and the main body 1, which is electrically connected to the outer peripheral plate 12, are connected to a comparison circuit 22 via lead wires.

Although not shown, a step-down transformer is connected between the inner circumferential plate 11 and the outer circumferential plate 12 constituting the electrode member, so that even if a human body touches the main body 1, there will be no adverse effect. It's like that.

To explain the dryness detection operation in the above configuration, the rotary drum 2 is rotationally driven by the drive motor 5, and the hot air heated by the heater 17 is transmitted to the inner circumferential surface of the front surface of the rotary drum 2 by the rotation of the fan 4. It is supplied into the rotary drum 2 through the through hole 11 provided in the rotary drum 2 and dries the clothes inside the rotary drum 2. While the rotating drum 2 is rotating, the clothes inside the rotating drum are always in contact with a pair of electrode members composed of an inner circumferential plate 11 and an outer circumferential plate 12 provided on the inner surface of the rotating drum 2. while it is damp,
The electrode parts are in a conductive state, but as drying progresses and the clothes are dry, the electrode members become non-conductive.

FIG. 2 shows an electrical flowchart for dryness detection, and 23 is a pair of electrode members composed of the inner peripheral plate 11 and the outer peripheral plate 12. As mentioned above, when the clothes are dry, the electrode members 23 The impedance between them becomes high. This output is input to a comparator circuit 22, which has a high input impedance and is composed of, for example, an FET. When the clothes are dry and the impedance between the electrode members 23 reaches a value above a certain value, the comparator circuit 22 inverts its output and operates the delay timer circuit 24 connected thereto.

The delay timer circuit 24 also drives the motor 26 after the time determined by the delay time determining section 25 has elapsed, opens the load contact section 27 controlled by the timer motor 26 after a certain period of time, and starts the heater 17. Stop energizing the loads such as drying and finish drying.

As described above, according to the present invention, the front surface of the rotating drum is divided into an inner circumferential plate and an outer circumferential plate, and the inner circumferential plate and the outer circumferential plate are electrically insulated and constitute a pair of electrode members. Since the entire periphery of both of them, with the bearing in between, becomes an electrode, even a small amount of clothing always comes into contact with the electrode member, improving detection sensitivity and making it possible to install a floor-standing clothes dryer on a stand. Even when the device is turned upside down, the relative positions of the electrode members described above do not change, and the same dryness detection performance can be obtained. Furthermore, compared to the conventional electrode method, it is extremely advantageous in terms of assembly and cost, as electrodes, sliders, etc. can be omitted.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a clothes dryer according to an embodiment of the present invention, and FIG. 2 is a flowchart showing the electrical circuit configuration of a dryness detection device. 1...Main body, 2...Rotating drum, 11...
...Inner circumference plate, 12...Outer circumference plate, 13a, 13b.
...Insulating member, 14...Bearing. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure-46: Figure 12

Claims (1)

[Claims] The front part of the rotating drum rotatably provided in the main body is divided into a ring-shaped inner circumferential plate having a clothing input port in the center and an outer circumferential plate connected to the circumferential wall of the rotating drum. The plate is fixed to the front surface of the main body via an insulating member, and the outer circumference of the inner circumference plate rotatably supports the inner circumference of the outer circumference plate via a bearing made of an insulating material. A clothes dryer with dryness detection, which is completely configured with a pair of electrode members for detecting the dry state of clothes.