JP3413421B2 - Facsimile machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine which prohibits or limits outgoing calls from a connected external telephone.

[0002]

2. Description of the Related Art Conventionally, in a facsimile machine having a calling function, all dial calls are made under the control of a CPU in the facsimile body. As a result, the dial call from the main body is restricted. Also, when a telephone is connected to the outside, only a so-called handset having no calling function is connected, and a call can be made only from the main body.

However, in the above-mentioned conventional example, when a telephone having a calling function is connected as an external telephone, there is a drawback that it is not possible to restrict the calling from that telephone.

[0004]

Therefore, the applicant of the present application, as shown in FIG. 2, provides the line current and signal detecting means 1 between the H relay 12 and the external telephone to perform current detection and signal detection. This limits the calling of the external telephone and calls the ID number with DC applied to the external telephone. If the ID is appropriate, the calling restriction state is released and the external telephone is switched to the line. A device configured to be connected is proposed (Japanese Patent Application No. 6-150396). Details of each unit in FIG. 2 will be described in the embodiment.

By the way, in the above-mentioned prior application, current sensors are used as the current detecting means and the signal detecting means. However, the current detection here is for detecting off-hook or on-hook of the external telephone, so it is not necessary to use the current sensor at this position.

Further, in the circuit configuration of FIG. 2, it is necessary to newly add the current detecting means 14 in order to detect the line current when the CML relay is switched to the modem side and judge the line abnormality. There is. In fact, the standards of Switzerland, Germany, etc. have provisions for line current detection during the operation of a facsimile.

According to such standards, 5 mA to 10 m
Since a low current during A must be detected, it is common to use a current sensor that has been specially developed.

As described above, in the circuit example shown in FIG. 2, in order to comply with the standards of countries such as Switzerland and Germany, it is necessary to use two current sensors, which is a drawback in terms of cost.

An object of the present invention is to provide a facsimile apparatus which can realize a call restriction from an external telephone at low cost.

[0010]

SUMMARY OF THE INVENTION The present invention provides an external telephone
In the connectable facsimile machine, the line is
This relay and the relay connected to the telephone or modem side.
Means for detecting the line current on the line side of the
Calls from the above external telephones are prohibited depending on the current detected
And a prohibition means for controlling the facsimile.

When a dial is made from an external telephone, the
Is switched to the modem side, the line is released, and calling is prohibited.

[0012] When you call the ID code * 25 For example, its
The ID is detected, the line is once opened, the external telephone is connected to the line again, and thereafter, normal calling is enabled.

[0013]

1 is a block diagram showing a first embodiment of the present invention.

Current and signal detection means (current sensor) 1
Is a means for detecting a line current and a signal on the line, and the CML relay 2 switches the line to the modem 7 side or an external telephone (not shown) side. The P relay 3 is a relay that generates a pulse dial, and the S relay 4 is a relay that disconnects a subsequent circuit while the P relay 3 is operating.

The transformer 5 is a transformer for separating the line (primary side) from the secondary side, and the 2-wire to 4-wire conversion circuit 6 separates / multiplexes a transmission system signal and a reception system signal, so that It is a circuit for converting a line signal and a 4-line signal.

The modem 7 modulates / demodulates a transmission / reception signal, the ROM 8 is a memory in which control software is stored, and the CPU 9 controls each hardware according to the software of the ROM 8. The detecting means 10 is means for detecting a call signal coming from the exchange, and is a DC
The (DC) power supply 11 is for detecting the off-hook of the external telephone when the telephone is disconnected from the line.

The H relay 12 is for switching the connection of the external telephone to the line or the DC application side, and the off-hook detecting photocoupler 13 is applying DC to the external telephone.
It is for detecting the current when it is off-hook.

FIG. 3 is a flow chart showing software for controlling the hardware of this embodiment.

First, in S1, the off-hook of the external telephone is detected. Here, since the external telephone is connected to the line, the off hook is detected by the current sensor 1.

If the off-hook is not detected in S1, it is determined in S2 whether the call signal is detected. Here, if the calling signal is detected and the facsimile apparatus is in the automatic reception mode, the process proceeds to the reception of S3. If the facsimile machine is in the manual reception mode, the external telephone keeps ringing. If the calling signal cannot be detected in S2, the process proceeds to S1 and the above operation is repeated.

When the off-hook of the external telephone is detected in S1, the process proceeds to S4, and the call signal detection circuit 10 determines whether a call signal is detected. If the call signal is detected, it is determined that the response is a telephone call, and the telephone conversation of S5 is performed.

If the calling signal is not detected in S4, the off-hook of the external telephone in S1 is intended for dialing, and the dialing signal called in S6 is detected. Here, while the dial signal is not detected, the on-hook of the external telephone is also detected in S7. The on-hook detection at this time is performed by the current sensor 1. Then, when the on-hook is detected, it returns to the standby state.

If there is any dial signal from the external telephone at S6, it is confirmed at S8 whether the signal matches the already registered ID number (eg * 25). Here, the ID number can be set arbitrarily, and both the pulse and DTMF of the dial signal can be detected.

If the ID numbers do not match, the CML relay 2 is switched to the modem 7 side in S9,
Disconnect the external telephone from the line and disable dialing (disabled). At this time, it is assumed that the P relay 3 and the S relay 4 are always in the open state (otherwise,
The line will be closed).

Subsequently, in S10, the H relay 12 is switched to the DC applying means 11 to supply power to the external telephone. Then, in S11, the photocoupler 13 is used to detect the on-hook of the external telephone.

In this way, the cost reduction from the circuit shown in FIG. 2 is realized by performing the off-hook and on-hook detection of the external telephone when the DC is applied by using the inexpensive photo coupler.

When it is detected in S11 that the external telephone is on-hook, the relays are initialized in S15 and the standby state is restored again.

In S8, the CPU 9 compares the dial signal detected by the current sensor 1 with the ID number, and if they match, the process proceeds to S12. Here, the CML relay 2 is once switched to the modem 7 side for several seconds to create a line open state, the CML relay 2 is returned to the external telephone side, and the line is connected again. The same thing can be done by using the H relay 12 instead of the CML relay 2.

Then, in S13, the calling prohibition state is released and the dial call can be made. Also at this time, the on-hook of the external telephone is monitored using the current sensor 1 in S14. Then, when an on-hook is detected, each relay is initialized in S15 and returns to the standby state again.

Next, FIG. 4 is a flow chart showing the operation of the second embodiment of the present invention. The same S number shown in each flowchart of FIGS. 3 and 4 means the same operation. Therefore, S8-1 and S8 indicated by broken lines
-2 is an additional function in the second embodiment.

In FIG. 4, if the dial signal sent by the external telephone is different from the ID number in S8, the operator is notified of the fact in S8-1. Similarly, if the ID numbers match, the operator is notified of the fact in S8-2.

As a means for informing, a voice message or a method of lighting an LED or the like in the facsimile main body can be adopted. With such an additional function, it is possible to realize a call prohibiting function that is easier for the operator to use.

FIG. 5 is a block diagram showing a third embodiment of the present invention.

This is the DC application circuit 1 from the first embodiment.
1, the H relay 12, and the photo coupler 13 are deleted.

The call restriction and the cancellation thereof are the same, and there is a great merit in terms of cost. However, when the CML relay 2 is switched to the modem 7 side, there is a disadvantage that the on-hook and off-hook states of the external telephone cannot be detected, but such a configuration is also included in the present invention.

[0036]

As described above , according to the present invention,
The call restriction function from an external telephone can be implemented while reducing costs.
It is possible to present.

Further, it is possible to notify the operator of the state of the call restriction function and improve the operability of the apparatus.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a prior art of the present invention.

FIG. 3 is a flowchart showing an operation according to the first embodiment.

FIG. 4 is a flowchart showing an operation according to the second embodiment of the present invention.

FIG. 5 is a block diagram showing a third embodiment of the present invention.

[Explanation of symbols]

1 ... current sensor, 2 ... CML relay, 3 ... P relay, 4 ... S relay, 5 ... trance, 6 ... 2 wire to 4 wire conversion circuit, 7 ... Modem, 8 ... ROM, 9 ... CPU, 10 ... Call signal detection means, 11 ... DC power supply, 12 ... H relay, 13 ... Photo coupler for off-hook detection.

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04N 1/32-1/36 H04N 1/42-1/44 H04M 11/00-11/10

Claims (7)

(57) [Claims] 1. In a facsimile apparatus capable of connecting an external telephone , a relay for connecting a line to the external telephone side or the modem side.
Over a; a detecting means for detecting a line current in the line side of the relay; facsimile apparatus characterized by having: in response to the detection of the line current, and inhibiting means for inhibiting the call from the external telephone . 2. The facsimile apparatus according to claim 1, wherein the detection means further performs signal detection to release the call inhibition. 3. A facsimile apparatus according to claim 1, further comprising means for notifying an operator that the apparatus is currently in a calling prohibition state. 4. The die according to claim 2, wherein the prohibiting means is a die detected by the detecting means.
A facsimile machine characterized in that , when a call signal coincides with a registered ID number for canceling the calling prohibition state , the calling prohibition is canceled . 5. The method according to claim 2, The prohibiting means is the die detected by the detecting means.
The dial signal releases the registered call barring status.
If you match the ID number for
You can connect the department telephone to the line and make subsequent calls.
A facsimile machine characterized by: 6. The method according to claim 2, The dial signal detected by the above detection means is registered.
The ID number for canceling the calling prohibition status
Providing a means to inform the operator whether or not
A facsimile machine characterized by. 7. The method according to claim 1, The prohibition means makes a dial call from an external telephone.
And switch the above relay to the modem side and open the line
Prohibiting calls from the above external telephones To do
A facsimile machine characterized by: