JPH0454476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a rotating drum for drying clothes;
The present invention relates to a rotary drum type clothes dryer that includes a heat source that heats air sent into the rotary drum and a drive motor that drives the rotary drum.

Conventional structure and its problems Conventional rotary drum type clothes dryers have been unable to rotate due to failure of the belt tension mechanism of the belt that transmits the power of the drive motor to the rotary drum, or when the belt comes off or is cut. When the drum stops rotating, the clothes in the drum are not agitated, so the hot air concentrates on some parts of the clothes, causing discoloration, melting, and scorching of particularly heat-sensitive fibers, and in the worst case scenario, the clothes catch fire, causing a fire. I was afraid. However, in conventional rotary drum type clothes dryers, when the rotary drum stops rotating and the blower fan is rotating, a thermostat installed near the heat source to prevent excessive temperature rise and a thermostat installed in the fan casing behind the rotary drum are activated. Since the temperature control thermostat does not turn off, hot air is continuously supplied to the rotating drum during the time limit of the time switch, and the system detects abnormalities such as stoppage of the rotating drum and stops energizing the heat source circuit. It wasn't.

Purpose of the Invention The present invention solves the problems of the conventional example and provides a highly safe rotating drum type clothes dryer that prevents clothes from burning and catching fire when the rotating drum stops. This system reliably and simply detects the rotational drum stoppage due to failure of the rotation mechanism, belt coming off, or cutting, and controls the supply of electricity to the heat source.

Structure of the Invention In order to achieve the above object, the present invention includes a drive motor and a belt that rotatably drive a rotating drum, and a belt tension mechanism, and the belt tension mechanism is provided in the vicinity of a tension spring that rotatably supports a tension pulley. Position the pressing part of the normally closed switch,
It is equipped with a drum rotation detection mechanism that opens the contact based on the amount of change in the tension spring caused by the belt coming off or being cut.In the event of an abnormality such as belt breakage or cutting, the normally closed switch opens the contact and turns off the power to the heat source circuit. It can be stopped reliably.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the figure, a rotating drum 4 rotatably supported by a drum support plate 2 and a fan casing 3 is provided inside the equipment main body 1, and a rotating drum 4 and a fan 5 inside the fan casing 3 are installed inside the equipment main body 1. A drum pulley 7 and a motor pulley 8 are provided at one end of a rotating drive motor 6, and rotation is transmitted via a belt 9 and a fan belt 10.

The belt support plate 2 has a clothing input port 11 and a plurality of hot air holes 12 formed in a part thereof, a heater 13 serving as a heat source is provided opposite the hot air holes 12, and a door 14 that covers the clothing input port 11 so as to be openable and closable. is fixed to the front of the device main body 1. Drive motor 6
is supported by a motor support plate 15 and fixed to the bottom surface of the device body 1, and a tension pulley 17 is rotatably supported on the other end of a tension spring 16 that is locked to the motor support plate 15. is formed into a substantially L-shape, and a winding portion 18 is provided in the middle to impart tension to the belt 9 in the direction of the arrow. Below the approximately L-shaped portion of the tension spring 16, a pressing portion 21 made of an insulator fixed to the movable contact plate 20 of the normally closed switch 19 is positioned with a gap a. The case 22 is fixed to the bottom inside the device main body 1. If there is no abnormality such as the belt 9 coming off or being cut, remove the tension pulley 17.
Since tension is applied to the tension spring 16 in the direction of the arrow as shown by the solid line, the rotational force of the drive motor 6 rotates the rotating drum 4 via the drum pulley 7 and the belt 9. At the same time, since a gap a is provided between the tension spring 16 and the pressing part 21 of the normally closed switch 19, the contacts 23 and 24 of the normally closed switch 19 are closed, and the heater 13, which is the heat source, is energized. hot air can be supplied into the rotating drum 4 by In addition, when the belt 9 breaks or comes off from the tension pulley 17, the tension spring 16 is always biased in the direction of the arrow, so the tension pulley 1
7 and the tension spring 16 are displaced to the state shown by the broken line, and the pressing portion 21 of the normally closed switch 19 provided below the approximately L-shaped portion of the tension spring 16
When pressed, the contacts 23 and 24 open, stopping the power supply to the heater 13 and also stopping the rotation of the rotary drum 4.

Effects of the Invention According to the above structure, the tension spring, which is the tension mechanism of the belt, is formed into a substantially L-shape, and a winding part is provided in the middle, and a detection switch is provided at the bottom of the winding part. When the rotating drum stops due to cutting, etc., the amount of change in the tension spring is used to reliably operate the contact of the micro switch to stop the power supply to the heater and motor. This prevents discoloration, scorching, or fire of clothing inside the rotating drum without providing any member to stop the current supply, increasing the safety of the equipment. Since an under pulley is provided that allows the belt to run along the circumference, the belt can be reliably supported on the rotating drum. Moreover, by adopting such a configuration, the structure becomes very compact.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a rotary drum type clothes dryer according to the present invention, and FIG. 2 is a sectional view of a main part of the clothes dryer. 1... Device body, 4... Rotating drum, 6... Drive motor, 16... Tension spring, 17
...Tension pulley, 19...Normally closed switch.

Claims (1)

[Claims] 1. A rotating drum rotatably supported within a device body, a motor for rotationally driving the rotating drum via a belt, a tension spring formed in a substantially L-shape and having a winding portion in the middle, and the above-mentioned Rotatably supported by one end of a tension spring,
It also includes a tension pulley on which the belt is applied in a direction that aligns the belt with the circumference of the drum, and a normally closed switch that is provided at the bottom of the tension spring and turns off the power by the tension spring when the belt is cut. Rotating drum type clothes dryer.