JPH05122393A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To implement maintenance and inspection of the equipment or the like smoothly by sending a secondary side signal of a network controller to a telephone set as an audible signal via an off-hook detection circuit. CONSTITUTION:When communication is started, a line 1a is connected to the position of a MODEM 3. Then an H relay is thrown to the position of an off- hook detection circuit 5 to discriminate whether or not the user depresses a key commanding the transmission of a line monitor tone of an operation section 9 in advance. When the key is depressed, a resistor used to decide a gain of an operational amplifier is connected to the MODEM 3 or the network control circuit 1 through a relay and a transistor(TR) or the like through the hook-off of the telephone set 2 and a line monitor tone is sent to the telephone set 2. Thus, the communication state is confirmed by the audible tone even in the equipment having no speaker and the maintenance and inspection or the like of the equipment are smoothly implemented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a configuration of a facsimile apparatus having a conventional off-hook detection circuit.

An NCU (network control unit) 1 switches a line 1a between a telephone 2 attached to the device and a modem (modulator / demodulator) 3 for modulating / demodulating a transmission / reception signal.

A main controller 8 is connected to the modem 3 via a modem controller 4 which controls the modem 3.

The main control section 8 controls the entire apparatus and is composed of a microcomputer. When receiving, the main control section 8 demodulates the received data from the line 1a demodulated by the modem 3 and received by it. The image data is recorded by the recording unit 6. Further, at the time of transmission, the image of the transmission original is read by the reading unit 7, the read image data is subjected to processing such as encoding, output to the modem 3, and sent to the line 1a. The main controller 8 also controls the NCU 1 via the control line 1b.

Further, the off-hook detection circuit 5 during communication is connected to the telephone 2, and its detection output signal Vout is
It is input to the main control unit 8 via the signal line 5a. And
The conventional off-hook detection circuit 5 for communication is configured as shown in FIG.

During communication of the device, the telephone 2 is connected in series between the connection terminals T1 and T2. A predetermined DC voltage Vcc is applied to one of the connection terminals T1 from a power source (not shown) via a current limiting resistor R1. The other connection terminal T2 is an LED that constitutes a photocoupler 9 for detecting a current flowing through the telephone 2 when it is off-hook.
It is connected to the anode of (light emitting diode) 9a.
The cathode of the LED 9a is grounded.

Also, the photo coupler 9 together with the LED 9a is used.
A direct-current voltage of 5 V is applied to the collector of the phototransistor 9b that constitutes the above-mentioned transistor through the resistor R2 for current control. The output signal Vout of this circuit is output from the connection point between the resistor R2 and the collector of the phototransistor 9b.
Is taken out and output to the signal line 5a.

Under such a structure, during communication of the facsimile apparatus, the line 1a is connected to the modem 3 side by the NCU 1 and the telephone 2 is connected to the connection terminal T shown in FIG.
1, T2.

In this state, when the telephone 2 is on-hook, the hook switch in the telephone 2 is open, so that no current flows through the telephone 2 and the LED 9a. Therefore, the LED 9a does not emit light, the phototransistor 9b is opened, and the potential of the output signal Vout is about 5
It becomes V.

On the other hand, when the telephone 2 is hooked off, the hook switch is turned on, and the resistance of the telephone 2 becomes a predetermined low value. Therefore, the DC voltage Vcc causes the DC current IF to change from resistance R1 to telephone 2 → It flows through the path of the LED 9a. As a result, the LED 9a emits light, the phototransistor 9b becomes saturated, and the potential of the output signal Vout becomes approximately 0V.

In this way, the output signal Vout for detecting the off-hook is obtained and input to the main controller 8. The main controller 8 uses this signal as, for example, a telephone reservation signal at the end of communication.

[0013]

By the way, in the conventional facsimile apparatus having no speaker, when performing maintenance and inspection of the facsimile apparatus, a service person confirms various signals of the facsimile apparatus such as a line monitor sound with an audible sound. However, there was a problem that maintenance and inspection could not be performed efficiently.

It is an object of the present invention to provide a facsimile machine capable of audibly confirming various signals from a line.

[0015]

SUMMARY OF THE INVENTION The present invention is a facsimile machine having an off-hook detection circuit for detecting off-hook by applying a voltage to a telephone during communication to detect a change in current flowing through the telephone. The secondary side signal of the control device is sent to the telephone as an audible signal through the off-hook detection circuit.

[0016]

1 is a circuit diagram showing an off-hook detection circuit of a facsimile apparatus according to an embodiment of the present invention.

In the figure, the H relay connects the telephone to the off-hook detection circuit during communication and is a conventionally known one. Further, L1 is a coil that applies a direct current to the telephone and cuts an AC component, and the resistor R1 and the capacitor C2 form a low-pass filter for preventing low-frequency noise of the power source Vcc from being transmitted to the telephone.

VZ1 is a varistor that protects the telephone so that an excessive signal is not sent to the telephone, and C1 is
A coupling capacitor, IC1, is an operational amplifier for amplifying the line monitor sound and at the same time preventing a signal on the telephone side from leaking to the modem side, and R3, R4, R5 are resistors for determining the gain of the operational amplifier.

The other elements are the same as those of the conventional example shown in FIG.

FIG. 2 is a block diagram showing the configuration of the facsimile apparatus of this embodiment.

The signal line 5b is connected to the modem 3 or NCU1.
It transmits a transmission signal or a reception signal from. Further, the operation unit 9 is provided with a key (not shown) for selecting a mode for transmitting the line monitor sound. In other words, in this embodiment, the line monitor sound is sent to the telephone only when the user, service person, or the like desires it. The other structure is the same as the conventional example shown in FIG.

In the above configuration, in this facsimile apparatus, the transmission signal or the reception signal is transmitted to the resistors R4 and R5.
Connect to and enable the line monitoring sound during communication to be confirmed on the telephone.

FIG. 3 is a flow chart showing the operation of this embodiment.

First, when communication is started, the line is connected to the modem side (S1). Here, the H relay is connected to the off-hook detection circuit 5 side (S2), and it is determined whether or not the user previously pressed the key for instructing the line monitor sound transmission of the operation unit 9 (S3). If it is pressed, the resistance R is set by the off-hook (S4) of the telephone set 2.
4, R5 are connected to the modem 3 or NCU1 by a relay, a transistor, etc., and a line monitor sound is sent to the telephone (S5). If the key is not pressed in S3, the off-hook (S6) of the telephone 2 causes
Make a telephone reservation (S7).

[0025]

According to the present invention, an off-hook detection circuit is used to send a line monitor sound or the like to a telephone with a simple structure, so that even a device without a speaker can check the communication status with an audible sound. Therefore, there is an effect that the maintenance and inspection of the device can be smoothly performed.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an off-hook detection circuit of a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a facsimile apparatus in the above embodiment.

FIG. 3 is a flowchart showing the operation of the above embodiment.

FIG. 4 is a block diagram showing a configuration of a conventional facsimile apparatus.

FIG. 5 is a circuit diagram showing an off-hook detection circuit of a conventional facsimile apparatus.

[Explanation of symbols]

 1 ... NCU, 1a ... Line, 2 ... Telephone, 3 ... Modem, 4 ... Modem control section, 5 ... Off-hook detection circuit, 6 ... Recording section, 7 ... Read section, 8 ... Main control section, 9 ... Operation section.

Claims (2)

[Claims] 1. A facsimile apparatus having an off-hook detection circuit for detecting an off-hook by applying a voltage to a telephone during communication to detect a change in a current flowing through the telephone. A facsimile apparatus, which sends out as an audible signal to a telephone through the off-hook detection circuit. 2. The function according to claim 1, wherein the secondary side signal of the network control device is sent to the telephone as an audible signal via the off-hook detection circuit, selectively based on a mode setting by a user's key operation. A facsimile machine characterized by being carried out.