| 摘要 |
An object of the present invention is to provide a simple, economical and safety driving device adapted to automatically operate when detecting solar rays, and an automatic ventilator system employing the same driving device. An electric motor (21) is connected to a relay switch (22) of a one-circuit-two-contact type, and the relay switch (22) is then connected to a limit switch (23) of a one-circuit-two-contact type and a photosensor switch (24) of a one-circuit-one-contact type. The limit switch (23) is connected between the relay switch (22) and a power supply, and a manual main switch (25) is connected between the photosensor switch (24) and the power supply. When the intensity of illumination of solar rays exceeds a threshold value of 3500 lux with the main switch (25) kept normally on, the photosensor detects it, the contact position of the switch (24) is switched from a to b to turn on the switch. Then, power is supplied to the relay switch (22), and the contact position thereof is also changed from a to b to turn the switch on. If the contact position of the limit switch (23) stays at b, the electric motor (21) is energized and starts to operate. The electric motor is interlocked with a ventilating door via a power transmission member, and the ventilating door is gradually opened. When the electric motor (21) continues to operate for a certain period of time, the limit switch (23) is brought into engagement with the power transmission member, and this changes the contact position thereof from b to a, the switch being then turned off. Therefore, the electric motor is brought to a halt, and the ventilating door interlocked with the electric motor can automatically be kept open without the manual switch being operated. In addition, although the main switch (25) is normally kept on, it functions as a safety switch for forcibly stopping the device when it is not used for a long period of time or at the time of maintainance.
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