JPH0243395B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a facsimile device having an automatic reception function, and to a power supply control method for connecting an AC input power source to the facsimile device in response to a call signal sent from a communication line.

The block configuration diagram of the part related to the present invention of a conventional facsimile machine having an automatic reception function is shown in the first part.
As shown in the figure. In the figure, 1 is a DC loop circuit, 2 is a CI detection circuit, 3 is a power control system, RL ₁ is a relay that operates by a call signal, RL _1-1 is a contact of relay RL ₁ , SW
is a switch. The automatic reception function of a facsimile machine operates using the same ringing signal as a telephone. Therefore, when a call signal is received from the communication line, relay RL ₁ operates, creating a DC loop in DC loop circuit 1 which does not require a power supply, and at the same time, relay of CI detection circuit 2 which requires power supply. Activate contact rl _1-1 to detect the CI (carrier indicator) signal sent from the other party's facsimile machine and start the facsimile machine.
In the case of automatic reception, the AC input power supply of the unattended facsimile machine cannot be connected by a human, and the switch SW is always connected, so even if you try to reduce power consumption, only the CI detection circuit 2 will not function properly. It had the disadvantage of consuming electricity.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power supply control system that eliminates power consumption during standby of a facsimile apparatus having an automatic reception function in order to eliminate the above-mentioned drawbacks.

To achieve the above object, the present invention provides a facsimile device having an automatic reception function, in which a contact point is connected to an input terminal that receives power from a power supply circuit of the facsimile device, and is operated by a calling signal sent from a communication line. A power supply holding circuit having a switch circuit parallel to the relay and the contact is provided, and the call signal operates the relay to close the contact, supplying power to the power supply circuit which has not received power until now, and holding the power supply. The switch circuit is operated by supplying power to the circuit, and even if the call signal is cut off and the contact is turned off, the power supply to the power supply circuit during communication is maintained.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram of a portion related to the present invention during standby of a facsimile apparatus having an automatic reception function according to an embodiment of the present invention. Components in the figure that have the same functions as those in FIG. 1 are indicated by the same symbols. 4 is a power holding circuit, rl _1-2 is a second contact of the relay RL ₁ , and rl ₂ is a contact of the relay in the power holding circuit 4. When a call signal is received from the communication line, relay RL ₁ operates, creating a DC loop in DC loop circuit 1 that does not require a power source, and operating the first contact rl _1-1 of relay RL ₁ , which is the same as the conventional example. However, while the calling signal continues due to the operation of relay RL ₁ , the second contact rl _1-2 of relay RL ₁ is operated and AC power is supplied to the power supply circuit 3.
At the same time as supplying power to the CI detection circuit 2, power is also supplied to the power holding circuit 4, and a relay (not shown) in the power holding circuit 4 is operated, contact rl ₂ is closed, and even if the call signal is cut off, the facsimile device will not operate. The AC power supply is maintained connected to the power supply circuit 3 during operation. When the facsimile machine has finished operating, restore the relay in the power supply holding circuit and close the relay contact.
Open rl ₂ to disconnect the AC power supply from the power supply circuit 3.

As described in detail above, according to the present invention, a facsimile apparatus having an automatic reception function has the effect that power consumption during standby is reduced to zero.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram of a part related to the present invention during standby of a facsimile device having an automatic reception function according to a conventional embodiment, and FIG. 2 is a block diagram of a facsimile device having an automatic reception function according to an embodiment of the present invention. FIG. 2 is a block configuration diagram of a portion related to the present invention during standby. In the figure, 1 is the DC loop circuit, 2 is the CI detection circuit, and 3
is a power supply circuit, RL ₁ is a relay operated by a call signal, rl _1-1 and rl _1-2 are contacts of relay RL ₁ , 4 is a power holding circuit, and rl ₂ is a contact of a relay in power holding circuit 4. .

Claims (1)

[Claims] 1. In a facsimile device having an automatic reception function, a relay whose contacts are connected to an input terminal that receives power from the power supply circuit of the facsimile device and is activated by a call signal sent from the communication circuit, and a switch circuit parallel to the contacts. The relay is activated by the call signal and the contact is closed to supply power to the power supply circuit which has not received power until now, and the power supply circuit is maintained by the output of the power supply circuit. The switch circuit is operated by supplying power to the circuit, and the power supply to the power supply circuit during communication is maintained even if the call signal is disconnected and the contact is disconnected due to the non-operation of the relay. A power supply control method characterized by: