JPS60220098A - Dryer - 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 [Technical Field of the Invention] The present invention relates to a dryer that is equipped with an electrode that detects the resistance of an object to be dried in a rotating drum and that stops drying operation based on a detection signal generated by the detection. .

[Technical background of the invention]

In a dryer, a pair of electrodes is disposed in a stationary state in a rotating drum that stores an object to be dried, and the rotating drum is rotated in one direction so that the object to be dried inside comes into contact with the pair of electrodes VC. The pair of electrodes detects the resistance of the object to be dried, and when the detection signal f indicating the drying rate of the object to be dried, which is output based on this resistance detection, reaches a predetermined value, the object is dried immediately or after a certain period of time. A structure that automatically stops operation is being considered.

[Problems with background technology]

According to the above configuration, when drying a mixture of long items such as sheets and clothing such as shirts as items to be dried, the clothes may be wrapped in the long items and only the long items on the surface may be dried. Therefore, this long object cannot come into contact with a pair of electrodes.
Also, when drying large items such as blankets, agitation within the rotating drum is difficult to occur and the force is applied in chunks to rotate with the rotating drum, drying only a portion of the surface. In either case, the detection signal based on the pair of electrodes reaches a predetermined value and the drying operation is stopped, leaving some of the items to be dried such as clothes and large items undried. There is a problem.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent the drying operation from being stopped when the material to be dried is not yet dried, even in the case where an electrode is used to detect the resistance of the material to be dried inside the rotary drum. Make sure! i! VC, which provides a dryer that can prevent

[Summary of the invention]

The present invention is provided with a detection circuit that has an electrode for detecting the resistance of the object to be dried in a rotating dohum and outputs a detection signal according to the drying rate of the object to be dried. The rotary drum is rotated in the forward direction until the indicated drying rate reaches a predetermined value, and when the drying rate reaches the predetermined value, the rotary drum is rotated in the reverse direction. This is to disentangle the entangled or clump-like dried material that is trapped inside the drum by rotating the rotating drum in the opposite direction.

[Invention! iii! Winding example]

An embodiment of the present invention will be described below with reference to the drawings.

First, the electrical configuration will be described according to FIG. 1 and 2 are a pair of electrodes stationary in a rotating drum (not shown), one of which, electrode 1, is at a positive potential (10V).
is connected to the DC power supply terminal 5 given, and the other electrode 2
is grounded via a resistor 4, and p1 forms a detection circuit 6 in which a common connection point between the electrode 2 and the resistor 4 is a detection terminal 5. Reference numeral 7 denotes an instantaneous value storage circuit consisting of a charging/discharging circuit, the input terminal of which is connected to the detection terminal 5, and the output terminal connected to the first input terminal IaK of the comparator circuit 8. 9 is a reference voltage generation circuit, which generates a reference voltage Vy corresponding to a predetermined drying rate (for example, 90%) of the material to be dried.
The signal is output from the i output terminal, and the output terminal is connected to the second input terminal Ibrc of the comparator circuit 8. Here, the comparison circuit 8 compares a storage voltage v7 outputted from the output terminal of the instantaneous value storage circuit 7 as described later and a reference voltage v outputted from the output terminal of the reference voltage generation circuit 9.
9, the memory voltage 7 is lower than the reference voltage v9 (V7
≦V? ), the detection end signal 88 is output from the output terminal, and the output terminal is connected to the control circuit 1.
0 is connected to the first input terminal l&. In this control circuit 101C, the second input terminal Ib is connected to the second output terminal Ob rc of the timer circuit 11, and the first output terminal Oa is connected to the first input terminal Ia of the drive circuit 12.
The second output terminal Ob is connected to the input terminal VC of the timer circuit 11, and the first output terminal Oa of the timer circuit 11 is connected to the second input terminal Ibrc of the drive circuit 12. . In this case, the control circuit 10
The power is on! When the start signal becomes I or after that, the drive signal 810a is output from the first output terminal Oa, and when the first input terminal Iarc detection end signal 88 is given, the operation signal 81ob is output from the second output terminal Ob. While outputting this operating signal 81ob, the IC
Detection end signal B6 given to first input terminal Ia
When the timer termination signal 511b, which will be described later, is applied to the second input terminal Ia, the drive signal 8106 from the first output terminal Oa and the second Output terminal O11 of
The output of the activation signal 810b is stopped. Further, when the timer circuit 11 receives the input terminal IC operation signal 5qob, it starts timekeeping operation and outputs the switching signal 80a from the first output terminal Oa, and when the timekeeping operation for a certain period of time is finished, the timer circuit 11 outputs the switching signal 80a from the second output terminal Oa. When the timer end signal S++b is output from Ob, and the operating signal 8+ob applied to the input terminal disappears during the timekeeping operation, the initial state 9 is reset and the switching signal 8116 is sent from the first output terminal ○a. At this time, the timer end signal 811b is not output from the second output terminal ob. Furthermore, when the drive circuit 12 is supplied with the first input terminal IaK drive signal 51oa, the drive circuit 12 forms an energizing circuit for the electric heater (not shown) and is rotatable in forward and reverse directions to rotationally drive the rotating drum and the fan. A forward rotation energizing circuit for the drive motor is formed, and then a second input terminal Ib1l'
When the c switching signal S11& is applied, the energization circuit for the electric heater is cut off, and a reverse energization circuit for the drive motor is formed.

Next, the operation of this embodiment will be explained with reference to FIGS. 2 and 6.

When the power is turned on or a start signal is applied thereafter, the control circuit 10 sends the drive signal 81oa to the drive circuit 1.
2rc, and the drive circuit 12 forms an energization circuit for the electric heater and also forms a normal rotation energization circuit for the drive motor. As a result, the drive motor rotates the rotary drum in the forward direction as shown in FIG. 2 (C) and FIG. Together with the electric heater, hot air is generated and blown into the rotating drum, thereby starting a hot air drying operation.The rotation of the rotating drum causes the material to be dried to be agitated. Since the object is intermittently in contact with a pair of electrodes 1.2 VC-9, each time the object to be dried comes into contact with the pair of electrodes 1.2, a detection signal is sent to the detection terminal 5 according to the resistance of the object to be dried. A detection voltage v5 is generated. That is, this detection voltage v5 becomes large when the object to be dried is not dried and its resistance is small, as shown in FIG. 2(a) and FIG. 3(&). As the drying of the material to be dried progresses and its resistance increases, it becomes smaller. Therefore, a change in the detection voltage 5 indicates a change in the drying rate of the material to be dried. , the detection voltage v5 output from the detection circuit 6 is given to the instantaneous value storage circuit 7, so the instantaneous value storage circuit 7 stores the instantaneous value of the detection voltage v5 (charges the capacitor and discharges it at a constant time constant). Therefore, the instantaneous value storage circuit 7
The memory voltage ■7 output from
As shown by the broken line in the figure (&), the instantaneous value is updated and stored every time a detection voltage v5 that is p larger than self is applied.

Therefore, in a hot air drying operation such as this, in a normal case where the entire object to be dried is uniformly dried, such as when the object to be dried is only clothes, the air flow rate is sufficient to dry the object almost completely. After a lapse of time, does the storage voltage v7 of the instantaneous value storage circuit 7 change to the reference voltage V of the reference voltage generation circuit 9? Therefore, the comparator circuit 8 outputs the detection end signal 86 and gives it to the control circuit 10.The control circuit 10 outputs the activation signal 810b and gives it to the timer circuit 111C. , inactive (off), as shown in Figure 2(b).
The timer circuit 11 in the state 11rc starts timing operation (
At the same time, the switching signal B11& is outputted to supply the driving circuit 12t'C. Accordingly, the drive circuit 12 turns off the energization circuit of the electric heater and also forms a reverse energization circuit of the drive motor, and the p1 rotating drum is rotated in the reverse direction as shown in FIG. is started.

Thereafter, when such cold air drying operation is carried out for a certain period of time, the timer circuit 11 ends (turns off) the timing operation as shown in FIG. Therefore, the control circuit 10 stops the output of the drive signal 8+oa and the operation signal 81ob, and when drying a long item such as a sheet and a shirt-like garment mixed together, or a blanket, etc. In the case of incomplete drying in which drying progresses partially, such as in the case of large objects, the storage voltage 7 of the instantaneous value storage circuit 7 is set to the reference voltage significantly before the time required for almost complete drying of the object to be dried. The voltage VprC & si (see FIG. 5(a)), therefore, the comparator circuit 8 outputs the detection end signal 8a to provide the control circuit 101C, and the control circuit 10 outputs the activation signal 8iob to provide the timer circuit 11Vc. . Then, the timer circuit 11 starts (turns on) the timing operation as shown in FIG.
21C, the drive circuit 12 forms a reverse energization circuit for the drive motor, thereby causing the drive motor to reversely rotate the IC rotating drum as shown in FIG. 6(Q). When the object to be dried, such as clothing enclosed in a long object, large lumps, or tangled clothes, is loosened by the reverse rotation of the rotating drum, the damp and undried object is released. When it comes into contact with the pair of electrodes 1.2 again, the detection circuit 6 outputs a detection voltage V5 which is higher than the reference voltage Vp, as shown in FIG. Memory circuit 7. Therefore, the comparison circuit 8 comes to stop outputting the detection end signal S8, and accordingly, the control circuit 10 comes to stop outputting the operating signal 8+ob, and the timer circuit 11 starts to stop outputting the detection end signal S8.
), the drive circuit 12 is reset to the initial state (turned off) and stops outputting the switching signal 811a, so that the drive circuit 12 again forms a normal rotation energization circuit for the drive motor. The drive motor begins to rotate the rotary drum in the forward direction as shown in FIG. 3(b), and the hot air drying operation is then restarted. Thereafter, if the material to be dried is normally dried, the rotary drum is rotated in the opposite direction based on the timing operation of the timer circuit 11 and cold air drying operation is performed for a certain period of time, as in the normal case described above. Drying operation is stopped. Also, when the rotating drum is reversely rotated again in an incomplete dry state after the hot air drying operation is restarted, V
C is the reference voltage V again from the detection circuit 6? Since a large detection voltage v5 is outputted, the hot air drying operation is performed again.

According to this embodiment, the following effects can be obtained. That is, when hot air drying operation is performed by rotating the rotary drum in the forward direction, the detection signal Vs f-
The stored voltage V7 corresponding to the drying rate of the material to be dried from the instantaneous value storage circuit 7 based on the reference voltage generation circuit 9 is the reference voltage V?
Since the rotating drum is rotated in the opposite direction when the following conditions are reached, this feature is useful when the clothes to be dried are wrapped in a long item such as a sheet, or when large items such as a blanket are in the form of a lump. These can be loosened and polished, and therefore, when the material to be dried is in an undried state, when the material to be dried in an undried state comes into contact with a pair of 11.2, it will be restarted. It is possible to reliably prevent the drying operation from being stopped even in trenches where materials are not yet dried. Moreover, when the drying operation is stopped, the rotating drum is always reversely rotated based on the timing operation of the timer circuit 11, and the cold air drying operation is performed for a certain period of time, so that the clothes to be dried become entangled. Even in cases where this is loosened, the wrinkles are removed using cold air.5 This has the advantage that the finish is extremely good.

Incidentally, in the above practical example, when the rotary drum is rotated in the reverse direction, the cold air drying operation is performed, but the hot air drying operation may be performed instead.

In addition, the present invention is not limited to the actual examples described above and shown in the drawings; for example, the circuit shown in FIG. Of course, it can also be implemented.

〔Effect of the invention〕

As explained above, in the drying S of the present invention, the rotating drum is rotated in the forward direction until the drying rate indicated by the detection signal corresponding to the drying rate of the object to be dried reaches a predetermined value, and when the drying rate reaches the predetermined value, the rotating drum is rotated in the reverse direction. Because it rotates, it is possible to reliably prevent the drying operation from being stopped when the material to be dried is not yet dried, even if the detection signal is obtained based on the electrode that is in contact with the material to be dried. It has excellent effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a block diagram showing the electrical configuration, and FIGS. 2(a) to (0) and 3(a) to (o) are voltage waveform diagrams. It is a time chart shown together. In the drawings, 1 and 2 are electrodes, 6 is a detection circuit, 7 is an instantaneous value storage circuit, 8 is a comparison circuit, 9 is a reference voltage generation circuit, 10 is a control circuit, 11 is a timer circuit, and 12 is a drive circuit. Applicant: Toshiba Corporation Figure 1 Figure 2

Claims (1)

[Claims] 1. A detection circuit that includes a rotating drum that can be rotated forward and backward, and an electrode that detects the resistance of the object to be dried in the rotating dohum, and outputs a detection signal according to the drying rate of the object to be dried based on the detection. The drying operation is stopped based on the detection signal of this detection circuit, and the rotary drum is rotated in the forward direction until the drying rate indicated by the detection signal reaches a predetermined level until the drying operation is stopped. A dryer comprising: a control circuit that controls the rotary drum to rotate in reverse at a predetermined time.