JPS59157555A - Drying detector - Google Patents

Abstract

PURPOSE:To decide on the drying state of a body to be dried securely by adding a smoothing part consisting of a capacitor. CONSTITUTION:An electric signal obtained by a conversion part B is smoothed by the smoothing part C consisting of the capacitor 6. The switch part D consisting of a diode 7, resistance 8, etc., is operated by the level of the electric signal smoothed by the smoothing part C to detect the degree of drying. Thus, the smoothing part C is added to discriminate clearly between the wet and dry states of the body to be dried so that the body is dry when the signal level is high and wet when low. Consequently, the decision on the drying state of the body to be dried is made securely.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dryness detection device for clothes dryers and the like.

Conventional structure and its problems Conventionally, when a dryness detection device in a clothes dryer inputs the drying state of the object to be dried to a microcomputer, if the object to be dried is wet, the signal input to the microcombi coater is The result is a rectangular wave in which two signal levels appear alternately.

In this way, since the input signal is a rectangular wave, it is difficult to determine whether the object to be dried is wet or dry, and the micro combi coater is likely to malfunction. It's a size.
There is a drawback that the drying state of the dried material cannot be arbitrarily adjusted upon completion of drying.

Purpose of the Invention The present invention solves the problems with the conventional dryness detection device, enables reliable determination of the dryness of the object to be dried, and makes it possible to arbitrarily determine the dryness of the object at the time of completion of drying. The purpose of this invention is to provide a dryness detection device that can be adjusted to the desired temperature.

Structure of the Invention The dryness detection device of the present invention includes a resistance detection section that detects the electrical resistance of the object to be dried, a conversion section that converts the resistance value obtained by the resistance detection section into an electrical signal, and a signal obtained by the conversion section. It consists of a smoothing part that smooths the electrical signal obtained by the smoothing part, and a switching part that switches depending on the level of the electrical signal obtained by this smoothing part, and allows a microcomputer to easily make a judgment. The drying state of the dried material at the time of completion can be adjusted as desired.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, 1 is an electrode, which constitutes a resistance detection section A that detects the electrical resistance of the object to be dried, 2 is a commercial power source, and a resistor 3, a resistor 4, and a diode 6 are connected to the electrode 1. A converter B is configured to convert the resistance value into an electrical signal.

The electrical signal obtained by the conversion section B is smoothed by a smoothing section C constituted by a capacitor 6. Depending on the level of the electrical signal smoothed by the smoothing section C, a diode 7, a resistor 8, a diode 9, a diode 10, etc. A switching section composed of a field effect transistor 11, a resistor 12, a resistor 13, a resistor 14, a transistor 16, and a resistor 16 switches to detect the degree of dryness.

The operation in the above configuration will be explained. Figure 2 shows the waveforms at each point. In this way, by adding the smooth part C,
It is possible to clearly distinguish whether the object to be dried is wet or dry; when the signal level is high, it is dry; when the signal level is low, it is wet. This makes input to the microcomputer easy.

Next, by changing the degree of smoothness of the smooth portion C, that is, the size of the capacitance of the capacitor 6, the degree of dryness can be changed. Figure 3 shows A when the capacitance of capacitor 6 is changed.
The waveforms of points and zero points are shown.

As a result, even if the resistance values between the electrodes 1 are the same, the capacitor 6 with a smaller capacitance detects that the object to be dried is wet, and the capacitor 6 with a larger capacitance detects that the object is dry. In other words, by changing the capacitance of the capacitor 6, the degree of dryness at the time of detection can be changed.

Note that the capacitor 6 in FIG. 1 may be replaced with a capacitor 6'. The point is to smooth out the pulsating flow at point A.

Effects of the Invention As is clear from the above embodiments, the dryness detection device of the present invention, especially by adding a smooth portion, facilitates input to a microcomputer, and allows switching of the degree of dryness when detecting 5-beam and 2-beams. It has the effect of being able to.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram of a dryness detection device showing an embodiment of the present invention, Fig. 2 shows signal waveforms of various parts of the electric circuit, and Fig. 1 (a) shows the case when the object to be dried is wet. The signal waveform diagram (1) in the same figure shows the signal waveform diagram when the material to be dried is dry, and Figure 3 shows the signal waveforms at various parts when the capacitance of the capacitor in the same electric circuit is different. Fig. 3(a) is a signal waveform diagram when the capacitance of the capacitor is small, and Fig. 3(b) is a signal waveform diagram when the capacitance of the capacitor is small. A...Resistance detection section, B...Conversion section, C
...Smooth section, D...Switching section. Name of agent: Patent attorney Toshio Nakao and one other person
I ¥1 (a) (shi) Figure 3 (a) (shi)

Claims (1)

[Claims] a resistance detection section that detects the electrical resistance of the object to be dried; a conversion section that converts the resistance value obtained by the resistance detection section into an electrical signal; a smoothing section that smoothes the electrical signal obtained by the conversion section; A dryness detection device comprising a switching section that switches depending on the level of an electrical signal obtained by the smooth section.