JPH0323077B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a clothes dryer in which a clothes inlet is provided on the outer curved surface of a rotating drum, and particularly to a method for stopping the drum in a fixed position.

(Prior art) Generally, in this type of clothes dryer, a clothes inlet is provided on the front end of the rotating drum, and clothes can be taken in and taken out from the front. If you do this, the position of the clothes slot will be very low, making it difficult to put in and take out clothes in a comfortable position. Transferring clothes to a clothes dryer has become extremely troublesome and has poor workability.

Recently, however, a clothes dryer has been proposed in which a clothes inlet is provided on the outer curved surface of the rotating drum so that clothes can be put in and taken out from the top.

(Problem to be solved by the invention) By the way, in putting such a clothes dryer into practical use, it is essential to be able to always stop the rotating drum in a fixed position. There is a need for a device and method that can reliably stop the machine at a fixed position.

The present invention has been made in view of this problem, and provides a practical method for stopping the drum at a fixed position, thereby making it easier to put this type of clothes dryer into practical use.

(Means for Solving the Problems) The present invention provides a clothes dryer in which a clothes input port is provided on the outer curved surface of a rotating drum, and the rotating drum is rotated by a motor to dry clothes with hot air while agitating the clothes. A rotation detector is provided to detect the rotation of the rotating drum, and the rotation period of the rotating drum is detected based on the output signal of the rotation detector. and,
When the motor is turned off when drying is complete, the motor is turned off when the rotating drum reaches the specified position.
Control is performed so that electromagnetic braking is applied for a time corresponding to the rotation period of the rotating drum of the motor.

The electromagnetic braking time described above is set to be long when the rotation period of the rotating drum is short, that is, when the rotation speed is high, and short when the rotation period is long and the rotation speed is low. By determining this in advance, it is possible to always stop the rotating drum at a position rotated by a constant inertia from the motor operation OFF position, that is, at a fixed position, regardless of its rotation period.

(Function) During the drying operation, the rotation period of the rotating drum is detected by the output signal of the rotation detector. When the end of drying is determined, the system waits until the rotating drum reaches a predetermined position, and then starts operating the motor when it is detected by the output signal of the rotation detector that it has reached the predetermined position.
By turning off the motor and applying electromagnetic braking to the motor for a time corresponding to the previously detected rotation period, the inertial rotation of the rotating drum is stopped by a certain amount after the motor is turned off.

In this way, when the rotating drum reaches a predetermined position, the motor is turned off, and the inertial rotation is stopped by a certain amount after the motor is turned off, so that the rotating drum always stops at a fixed position.

(Example) Examples of the present invention shown in the drawings will be described in detail below.

First, in Fig. 2, numeral 1 denotes a dryer outer frame having an opening 2 on the top surface and a top lid 3 for opening and closing this opening 2; 4 denotes a rotating drum rotatably installed inside the outer frame 1; A clothing inlet 5 is provided on the curved surface, and an opening/closing lid 6 is provided on the clothing inlet 5. Reference numeral 7 denotes a circulation path for drying air, which together with the rotating drum 4 forms an annular air passage. 8 is a drying heater provided in the circulation path 7, and 9 is a double-blade fan that also serves as a heat exchanger, which dehumidifies the drying air by exchanging heat with the drying air. Reference numeral 10 denotes a motor for rotating the rotating drum 4 and the double-winged fan 9. Reference numeral 11 denotes a rotation detector for detecting the rotation of the rotating drum 4, which is composed of, for example, a combination of a reed switch 11a and a permanent magnet 11b. They are respectively arranged on the outer surface near the input port 5. Therefore, reed switch 11
a will repeat ON and OFF as the rotating drum 4 rotates, and the rotating drum 4 will be connected to the clothes input slot 4.
is turned on by the permanent magnet 11b when it comes to a position facing the opening with the outer frame 1.

Next, FIG. 3 is a block diagram showing the entire control device. In the figure, 12 mainly includes a control unit 13 having the functions of a CPU and an I/O unit (input/output unit), a program/fixed data memory (ROM) 14, a temporary memory (RAM) 15, a timer 16, etc. 17 is a rotation detection circuit; 18 is a triax for turning on and off the operation of the motor 10; 19 is a triax for applying electromagnetic braking to the motor 10; 20 is for turning on and off the drying heater 8. Triack for,
21 is a start switch, and 22 is a power switch. The control section 13 controls the start switch 21.
When it is turned on, the control data is read from the ROM 14, and the rotation detection circuit 17 is read from the rotation detector 11.
The drying operation is controlled by reading the rotational information inputted through the triax and giving signals to each of the triaxes 18 to 20 to control the heater 8 and the motor 10.

In the above configuration, the control unit 13 is configured as shown in FIG.
The apparatus is configured to control the execution of the drying operation as shown in the flowchart of FIG. The control will be explained below.

Now, put the clothes into the rotating drum 4 and open/close the lid 6.
Close the top cover 3 and turn on the power switch 22.
After that, when the start switch 21 is turned on, a signal is given to the triaxes 18 and 20 to turn on the triaxes 18 and 20, thereby starting the motor 1.
While the main winding 0 and the heater 8 are energized, the timer starts counting. Then motor 1
0, the rotary drum 4 and double-winged fan 9 rotate, and the heater 8 generates heat, thereby drying the clothes with hot air while agitating the clothes.

During such drying work, the reed switch 11a is turned on every time the rotary drum 4 rotates once, and each time the reed switch 11a is turned on, timer data is read and the ON period of the reed switch 11a, that is, the rotation period of the rotary drum 4 is determined. Detect and remember. Then, such detection of the rotation period is repeatedly performed, for example, 10 times, and when the 10 times have been detected, the average value T _AV of the 10 rotation periods is calculated and stored. Thereafter, the above operation is repeated until the predetermined drying time ends, and the stored value of the rotation period average value T _AV is sequentially rewritten to a new average value.

When the predetermined drying time ends, the average value T _AV of the rotation period stored at this time is first read out, and the electromagnetic braking time T _ST is determined from this value T _AV . For example, if the inertial rotation of the rotating drum 4 is to be stopped after one rotation after the motor 10 is turned off, the inertial rotation of the rotating drum 4 is stopped by one rotation according to the average value T _AV of the rotation period of the rotating drum 4. Calculate the electromagnetic braking time T _ST required to stop the drying process in advance, memorize that value, and set the electromagnetic braking time according to the average value of the rotation period at the end of drying.
Read T _ST . Next, turn TRIATSUCK 20 off.
After turning off the power to the heater 8, stopping and clearing the timer, the reed switch 11a is turned on.
Wait until it turns on. Then, when the rotary drama 4 rotates and reaches a position where the clothes slot 5 faces the opening 2 of the outer frame 1, and the reed switch 11a is turned on by the permanent magnet 11b, the ON of the reed switch 11a is detected and the reed switch 18 is turned on. of
At the same time, the triax 19 is turned on to energize the auxiliary winding of the motor 4, thereby applying electromagnetic braking to the motor 4. After applying electromagnetic braking for a braking time T _ST determined from the average rotation period T _AV of the rotating drum 4, the triax 19 is turned off to release the electromagnetic braking. Then, rotating drum 4
The inertial rotation of the drum 4 stops after one revolution after the main winding of the motor 4 is turned off, and the rotating drum 4 stops at a position where the clothes slot 5 faces the opening 2 of the outer frame 1 (fixed position).

As described above, the main winding of the motor 10 is energized when the rotating drum 4 reaches a predetermined position.
When the rotation period is short (rotation speed is high), electromagnetic braking is applied for a long time, and when the rotation period is long (rotation speed is low), electromagnetic braking is applied for a short time, thereby reducing the inertial rotation of the rotating drum 4. The rotating drum 4 can always be stopped at a fixed amount, and the rotating drum 4 can always be stopped at a fixed position.

In the above embodiment, the rotation detector is a combination of a reed switch and a permanent magnet, but it may also be a rotation detector in which a light-emitting element and a light-receiving element are combined with a light-shielding plate.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and it goes without saying that the present invention can be implemented with appropriate modifications within the scope of the invention.

(Effects of the Invention) As described above, according to the present invention, the rotating drum can always be reliably stopped at a fixed position, and it is easy to put into practical use a clothes dryer in which the clothes input port is provided on the outer curved surface of the rotating drum. , its workability can be improved.

[Brief explanation of the drawing]

1A and 1B are control flowcharts of a clothes dryer according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional configuration diagram of the dryer, and FIG. 3 is a block diagram showing the entire control device. 4: Rotating drum, 5: Clothes input port, 10: Motor, 11: Rotation detector, 12: Electronic control circuit.

Claims (1)

[Claims] 1 A clothing slot is provided on the outer curved surface of the rotating drum,
In a clothes dryer that uses a motor to rotate a rotating drum to agitate the clothes while drying them with hot air, a rotation detector is installed to detect the rotation of the rotating drum, and the output signal from this rotation detector determines the rotation period of the rotating drum. is detected, and when the drying is completed, the motor starts operating when the rotating drum reaches the specified position.
A method for stopping a drum in a clothes dryer at a fixed position by controlling the motor to be turned off and applying electromagnetic braking for a time corresponding to the rotation period of the rotating drum.