JPH0435700A - clothes 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 Field of the Invention The present invention relates to a clothes dryer having a lid for putting in clothes on the outer peripheral surface of a drum for storing clothes.

2. Description of the Related Art A conventional drum position control device for a clothes dryer has a configuration as shown in FIG. After inputting the rotational position detection signal, the motor drive section 10 repeatedly performs electromagnetic braking and reverse driving of the motor 3 a certain number of times, and then the motor 3 is turned off and the drum lid 5 is stopped at a predetermined position. This drum 4 rotates in the horizontal direction and is provided with a drum lid 5 on its outer periphery for loading and unloading clothes.
This ensures that clothes can be removed when opened.

Problems to be Solved by the Invention In such a conventional drum fixed position control device for a clothes dryer, when stopping the drum lid 5 at a predetermined position, the motor 3
After repeated electromagnetic braking and reversal driving, the rotational position detection means 8 detected that the drum lid 5 had reached the predetermined position, and the motor 3 was immediately turned off.
Due to inertia rotation, the drum lid 5 may shift from a predetermined position and stop, resulting in a problem of poor usability when loading and unloading clothes.

In view of the above problems, it is an object of the present invention to accurately stop a drum lid at a predetermined position.

Means for Solving the Problems To achieve this object, the clothes dryer of the present invention includes a drum that rotates around a horizontal direction, and a drum lid for loading and unloading clothes provided on a part of the outer peripheral surface of the drum. and a rotational position detection means for detecting the rotational position of the drum, an operation control section that receives the rotational position detection means as an input, a motor that drives the drum, a motor that drives the motor, and a drive section. , when stopping the drum, by repeatedly performing electromagnetic braking and forward/reverse driving of the motor, the rotational position detecting means detects that the drum lid has reached a predetermined position, and then electromagnetic braking is performed for a short time. After placing the
The drum lid is configured to be stopped at a predetermined position by turning off the motor.

Function: With this configuration, electromagnetic braking is applied for a short period of time when the drum lid is stopped at a predetermined position, so the drum lid does not shift from the predetermined position due to inertial rotation of the drum, and operability when loading and unloading clothes is improved. .

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a drum fixed position control device for a clothes dryer according to an embodiment of the present invention, FIG. 2 shows a flowchart of a drum fixed position control method according to an embodiment of the present invention, and FIG. ON/OFF of the rotational position detection signal of the drum 4 during drum fixed position control in the embodiment
The signal waveform and the ON-OFF waveform of the motor 3 for rotating the drum 4 in forward and reverse directions are shown.

First, in FIG. 1, the power supply section 1 causes the operation control section 2 to
．． Power is supplied to the motor 3. Further, when the drum 4 is rotating, a predetermined position detection signal is input to the operation control section 2 by the proximity switch 6, magnet 7, and rotational position detection means 8 every time the drum lid 5 passes a predetermined position. The operation control section 2 controls a reverse operation control section 2a that controls the reverse rotation direction of the motor 3, a forward rotation operation control section 2c that controls the forward rotation direction of the motor 3, and a reverse rotation operation control section 2a that controls the motor 3. It has an electromagnetic braking means for applying electromagnetic braking to 3.

The motor drive unit 10 also includes a reverse drive unit 10b that controls energization to the main winding side of the motor 3 based on a signal from a reverse motion control unit 2a of the operation control unit 2, and a reverse drive unit 10b that controls energization to the main winding side of the motor 3 based on a signal from a reverse rotation motion control unit 2a of the operation control unit 2. It has a normal rotation driving section 10a7 that controls the supply of electricity to the auxiliary winding. Further, the electromagnetic braking control means 2
b controls the reverse rotation operation control means 2a, and controls the reverse rotation drive unit 10.
b applies electromagnetic braking by energizing the auxiliary winding of the motor 3 in short pulses.

Here, in FIGS. 2 and 3, when the stop of the drum 4 is set by the input unit 9 (step 1), it is determined whether the rotational position detection signal is turned ON or not (step 2).
When ON is detected, the auxiliary winding of the motor 3 is energized with a 5/6 pulse cut, and electromagnetic braking is applied to the drum 4 in the opposite direction for 2.0 seconds (step 3).

After the motor 3 is de-energized for 0.3 seconds (step 4), the main winding of the motor 3 is turned on for 0.1 as shown in A in Fig. 3.
Seconds, 0.1 seconds, 0.2 seconds, 0.4 seconds...OFF time 0.3 seconds...The drum 4 is rotated at low speed in the forward direction (step 5).

When the rotational position detection signal turns ON and N as the drum lid 5 passes through a predetermined position (step 6), the auxiliary winding of the motor 3 receives an ON time of 0.5 seconds, 0.3 seconds, and 0.5 seconds as shown in B in FIG. 2 seconds... OFF time 0.4 seconds... Intermittent energization is performed to rotate the drum 4 at low speed in the opposite direction (step 7). By repeatedly driving the drum 4 in forward and reverse directions while changing the 0N-OFF energization ratio of intermittent energization (
Step 8.9), the drum lid 5 finally reaches the predetermined position (step 10), but if the power to the motor 3 is immediately stopped, the drum lid 5 will shift from the predetermined position due to the inertial rotation of the drum 4. This causes the machine to stop, making it difficult to use when taking out clothes. Therefore, the auxiliary winding of the motor 3 is energized with a 1/4 pulse cut as shown in FIG. It can be stopped without any deviation (step 11). Thereafter, by stopping the power supply to the motor 3 (step 12), the drum lid 5 is reliably stopped at a predetermined position.

As described above, by applying electromagnetic braking when the drum lid 5 finally reaches the predetermined position, there is a sufficient braking effect, and there is little vibration and noise, and the drum lid is reliably stopped at the predetermined position. It is possible to control the fixed position of the drum of a clothes dryer.

In this embodiment, the proximity switch 6 and magnet 7 are used to detect the rotational position, but a Hall element and a magnet, or a light emitting component and a light receiving component may be used.

Although the drum 4 is rotated at a low speed by intermittent energization of the motor 3, the drum 4 may be mechanically decelerated by a gear or the like to perform the low-speed rotation.

In addition, the present invention is not limited to the embodiments described above or shown in the drawings, and may be implemented with appropriate modifications within the scope of the gist.

Effects of the Invention As described above, in the present invention, when the drum lid finally reaches a predetermined position, the drum lid can be accurately stopped at the predetermined position by applying electromagnetic braking for a short time. Improves operability when loading and unloading.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a clothes dryer according to an embodiment of the present invention, Fig. 2 is a flowchart showing the control procedure of the operation control unit, and Fig. 3 is a rotational position detection signal and a motor for stopping the drum lid at a predetermined position. FIG. 4 is a block diagram of a conventional clothes dryer. 2...Operation control unit, 3...Motor, 4
...Drum, 5...Drum lid, 6...
... Proximity switch, 7 ... Magnet, 8 ...
...Rotational position detection means. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure 2 10 Figure 164

Claims (1)

[Claims] A drum that rotates around a horizontal direction, a drum lid for loading and unloading clothes provided on a part of the outer peripheral surface of the drum, a rotational position detection means for detecting the rotational position of the drum, and an input of the rotational position detection means. a motor that drives the drum; and a motor drive unit that drives the motor; the operation control unit controls the motor drive unit to stop the drum when the drum is stopped; Electromagnetic braking and forward/reverse driving of the motor are repeated, and when the rotational position detection means detects that the drum cover has reached a predetermined position, electromagnetic braking is applied for a short time, and then the motor is turned off.
F, and the clothes dryer is configured to stop the drum lid at a predetermined position.