Actuator for shutter

Abstract

To provide a shutter opening / closing device with a function of keeping a shutter in an opened / closed condition, for saving space and giving proper opening / closing operation to the shutter while seizing the position of the shutter. The shutter opening / closing device comprises the shutter 18 provided closeably provided in an opening portion 21 of a frame 20 and energized to the closing direction by a dead weight, a reduction mechanism 5 for reducing the speed of a stepping motor 4 which gives opening / closing operation to the shutter 18 against the dead weight and transmitting the output to the shutter 18, and a one-way clutch 24 for cutting off connection to the shutter 18 when the shutter 18 is driven in the closing direction and then the operation of the shutter 18 is prevented by a preventing portion which prevents the operation of the shutter 18 at a closing position of abutting on the end face of the opening portion 21.

Description

(1) Technical field [0001] The invention relates to a ventilating fan used for exchanging indoor air to keep the indoor air fresh, in particular to an opening and closing device of a louver of the ventilating fan. (2) Background technology [0002] The ventilating fan has a louver which opens the opening only when blowing and discharging the indoor air, and closes the opening at other times. There are many kinds proposed in the prior art about the opening and closing mechanism of this shutter (for example, patent document 1). [0003] In the opening and closing device for the shutter of a ventilation fan described in Patent Document 1, a reduction gear mechanism is provided between a motor shaft as a driving source and a drive shaft for driving the shutter, and a driving side and a driven side are arranged in the reduction gear mechanism. A side-connecting or disconnecting clutch is provided with a solenoid for actuating the clutch. And, when the switch of the ventilating ...

AI Technical Summary

Problems solved by technology

[0005] However, in the opening and closing device for the ventilator shutter described in the above-mentioned patent document, the number of parts increases due to the use of a solenoid, and a space for arranging the solenoid is required, resulting in a problem of increasing the size of the device.

In addition, in order to maintain the open state of the shutter, it is necessary to continuously energize the solenoid to maintain the connection of the clutch, and there is a problem of large power consumption.

Furthermore, there is a problem that a knocking sound caused by the plunger is generated when the solenoid is energized and when the energization is stopped.

There is also the problem of increasing the number of parts due to the use of a spring for keeping the shutter in the closed position

In addition, when the shutter is closed, it is necessary to have a brake device for slowing down the closing speed of the shutter against the self-weight of the shutter and the force of the spring, resulting in an increase in the number of parts. Space, there is a problem of increasing the size of the device

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