JPS6348217B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides for a facsimile device that uses a general telephone line to detect when an abnormal state such as polarity reversal of the line occurs while transmitting calligraphic information and terminate the communication. The present invention relates to a facsimile device that reads a transmission document or recording paper or ejects it from a recording position.

Conventionally, a facsimile communication system has been proposed that uses a general telephone line to transmit print and print information unattended. In this type of scheme, usually
When the sending device finishes transmitting the desired calligraphic information and the document is sent out from the reading position, the device automatically returns to the off-hook state, and at this time, the receiving device also returns the recording paper to the recording position. It somehow detects that it is no longer present and that the sending device has hung up and restores the device to an off-hook state. In this way, when the calligraphic communication is completed normally, the device is restored to a state where it can be used from now on without any problems.
However, if an abnormal condition occurs during the transmission of calligraphy information, the following problem occurs.

In general, abnormal conditions occur during the transmission of graphics information using the above-mentioned facsimile communication method: (1) When the other station experiences a power outage; (2) When the other station discovers many errors in the received data. In other words, when the line condition is poor and the receiving equipment hangs up, (3) When the operator makes a mistake and the equipment hangs up, (4) When the equipment hangs up due to a malfunction in the switching equipment, ( 5) If the polarity of the line is reversed, etc. may occur. In this case, the device on which the abnormality was detected will quickly recover to a hang-up state and cut off the line, and the other device will also detect that the above-mentioned device has hung up and similarly cut off the line. However, at this time, the transmitted original or recording paper of both devices still exists at the reading position or recording position. This means that the devices are in a busy state, and that it is impossible to automatically carry out print/picture communication with these devices from now on. It is clear that it is not desirable for this state to continue for a long time. Furthermore, if such an abnormality occurs, it is necessary to restart the document/image communication, but since the line is cut off, it is also impossible to receive a signal indicating the abnormality from the other party's device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a facsimile device that promptly removes a transmitted original or recording paper when a line hangs up during communication of calligraphic information.

Hereinafter, the content of the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is a block diagram of an embodiment of a facsimile transmitter/receiver according to the present invention. In the figure, a general telephone line L is connected to a line control section 1. The line control unit 1 is a device that controls a telephone switching network,
It sends out dial pulses during transmission, detects ringing signals during reception, and forms DC circuits. 2 is a modem, 3 is a document/image information processing section, 4 is a plotter, and 5 is a scanner. Reception of calligraphy information from the partner station is performed as follows. That is, when the device is called by the other party and the telephone line L
When a ring signal arrives through the line controller 1
The ringing signal is detected, and the hook switch provided in the control section 1 is operated (ie, turned on) to form a DC circuit with the partner station. The calligraphy information coming from the line L is sent to the control unit 1,
The data is sequentially supplied to the document/image information processing section 3 through the modem 2. Upon reception, the processing unit 3 expands the received calligraphy information and converts it into an electrical signal sequence suitable for recording, and also controls the entire system and establishes synchronization based on commands from the transmitting side. The document and image signals reproduced by the processing section 3 are supplied to the plotter 4, where they are restored into a visible image corresponding to the original on the sending side. Similarly, when transmitting calligraphic information from the device to the other party's facsimile device, first the switch of the line control section 1 is turned on and a dial pulse of the other party's station is sent. The scanner 5 performs main and sub-scanning of the transmission original and converts it into calligraphy information, and the calligraphy information obtained by the scanning is sequentially supplied to the processing section 3. At the time of transmission, the processing unit 3 performs compression processing of the drawing information, and also performs operations related to the entire system and establishes synchronization with the partner station. The calligraphy information compressed by the calligraphy information processing section 3 is sent to the telephone line L through the modem 2 and the line control section 1. This type of facsimile transmitter/receiver is well known, and further detailed description thereof will be omitted.

Now, in FIG. 1, a hang-up detection circuit 6 is connected to the line control section 1. The hang-up detection circuit 6 detects whether or not both devices are connected on the line L, and when the line control unit on the other side hangs up, it sends a "1" signal to the transmitting hang-up logic circuit 7 and the receiving hang-up logic circuit. Supplied to logic circuit 8. The transmission hangup logic circuit 7 is supplied with a signal from the scanner 5 via a line 11 indicating whether or not there is a document at the reading position, and the reception hangup logic circuit 8 is supplied with a signal indicating whether or not a document exists at the reading position from the plotter 4 via a line 12. A signal indicating whether or not it is present in the plotter 4 is supplied. 9
is an alarm device that gives a warning to the operator that retransmission will be performed.

Assume that the facsimile device is currently in a transmitting state. When the other party's device hangs up, this is detected by the hang-up detection circuit 6, and a signal indicating this is given to the transmission hang-up logic circuit.At the same time, a signal indicating that the document is still in the reading position because it is being transmitted is sent. is supplied from the scanner 5 to the transmit hangup logic circuit 7 via line 11, and the transmit hangup logic circuit 7 sends a "1" signal to the output line 13. This output line 1
3 is supplied to the line control section 1 and the scanner 5. As a result, the line control unit 1 hangs up the device and disconnects it from the line L, and
The scanner 5 switches the document feeding speed to high speed to promptly remove the transmitted document from the reading position. Further, the "1" signal on the output line 13 is also supplied to the alarm device 9, and at this time, the alarm device 9 issues a warning to the operator that retransmission is required.

Similarly, when the facsimile device is in the receiving state and the other party's device hangs up, a signal indicating this is provided from the hangup detection circuit 6 to the reception hangup logic circuit 8. At this time, a signal indicating that the recording paper is still in the plotter 4 is sent to the receive hang-up logic circuit 8 through line 12.
and the receive hang-up logic circuit 8
A “1” signal is sent from the output line 14 to the output line 14. The “1” signal on this output line 14 causes the line control unit 1
The plotter 4 restores the apparatus to the hang-up state, and the plotter 4 switches the feeding speed of the recording paper to a high speed to quickly remove the recording paper from the recording position. In other words, this means that the device has been restored to a state where it can be called again by the partner device.

FIG. 2 shows various specific examples of hang-up detection circuits. In general, in facsimile systems that use telephone lines, methods for detecting a hang-up on the other party's device include (1) a method by disconnecting the carrier of the line, (2) a method by restoring the polarity of the line, and (3) a signal on the line. (4) A method using a combination of two or more of the above methods. Here, the detection method using carrier disconnection means that the carrier that is continuously sent out from the transmitting station is
This takes advantage of the fact that it suddenly disappears when a hangup occurs. In addition, the detection method using polarity recovery means that when the line is connected to the called side, the voltage polarity between both lines of the calling side's office line is reversed, and when the called side hangs up, the voltage polarity of the calling side is restored. It takes advantage of the fact that The detection method based on level fluctuations utilizes the fact that a closed loop is formed by a hybrid coil when a line connection is established, and that the closed loop is broken due to hang-up. That is, a hang-up on the receiving side can be detected by detecting a change or difference between the output level at the transmitting end when a closed loop is established and the output level at the transmitting end when the loop is opened due to a hang-up.

FIG. 2A shows a specific example of a hang-up detection circuit using polarity reversal. However, in principle, this
It only detects that the called party has hung up. In the figure, rc ₁ is a contact for closing the DC circuit, and when the contact rc ₁ is closed, the line L is connected by the DC resistance of the coil T, and connection with the exchange line is established. rd ₁ to _{rd 3} are contacts that operate later than the contact rc ₁ in order to avoid transient characteristics when the contact rc ₁ operates. Contact rc ₁ and contacts rd ₁ to rd ₃ are operated by appropriate relays during transmission or reception, but since the mechanism has already been proposed, further explanation will be omitted. Now, the device is in transmitting or receiving state, contacts rc ₁ , rd ₃ are on, contact rd ₂ is on
Suppose that is held in the off state. At this time, the voltage polarity of line L is positive on the _L1 side and negative on the _L2 side,
RA relay is working, RA relay has its contact ra ₁
At the same time, contact ra ₂ is made. RB relay does not work due to diode _D2 . Now, when the other party hangs up, the voltage polarity of line L is reversed. As a result, the RB relay operates and its contact _rb1 is made. The contact rb ₁ is connected to the line 10 described in FIG.
When rb ₁ makes, a signal H.U-1 is sent on line 10 indicating that the other party is hung up.
When contact rc ₁ returns to the OFF state, the RA relay's self-holding is released and the RB relay is restored.

FIG. 2B shows a specific example of a hang-up detection circuit due to carrier disconnection, which detects only hang-ups on the transmitting side. In the figure, among the signals taken into the line control unit 1, the carrier is
It is detected by passing through the AGC amplifier AMP ₁ , the bandpass filter BPF, and the high frequency amplifier AMP ₂ . The carrier thus detected is converted into a DC signal by a rectifier circuit D and a low-pass filter LPF, and then sent to the output side through a threshold circuit SCH. While there is a carrier on the line L, the output of the threshold circuit SCH prohibits energization of the gate G, and when the carrier on the line L is disconnected, the output of the threshold circuit SCH disappears, and the line 10 explained in FIG. A signal H.U-2 is sent out indicating that the side is hung up.

FIG. 2C is a specific example of a hang-up detection circuit that utilizes output level changes at the transmitting end, and is particularly suitable for short-range applications due to limited communication links. The circuit configuration is almost the same as that shown in Figure 2B above.
After the output signal from the line control section 1 is amplified by the amplifier AMP, it is converted into a DC signal by the rectifier circuit D and the low-pass filter LPF, and sent to the output line 10 through the threshold circuit SCH. In other words, when a hang-up occurs on the transmitting side and the voltage level on line L changes, this causes the threshold circuit SCH to change.
A signal H.U-3 is sent to the line 10 described in FIG. 1 indicating that the other party's device has hung up.

As is clear from the explanation so far, Fig. 2A
All of the methods .about.C can only detect a hang-up state in either the originating or incoming call. Therefore, in reality, it is necessary to combine these methods so that the device can handle both call origination and call reception. FIG. 2D is a diagram for explaining this. That is, FIG. 2D shows the hang-up detection signals H・U-1, H・
This means that U-2, H and U-3 are connected to the OR circuit OR, and if a hang-up is detected in any of them, a message to that effect is sent to the output line 10. In addition to the above, in normal telephone systems, when one subscriber hangs up, a busy tone is emitted from the exchange to the other subscriber, so this busy tone is detected and the other party's hang-up is detected. You can also know. This method is
It has the feature of being able to detect hang-ups of the other party regardless of whether the call is being made or received.

FIG. 3 shows a specific example of each part of the scanner 5, transmission hangup logic circuit 7, and retransmission alarm device 9 in FIG. In the figure, a transmission document 15 is sent in the direction of the arrow by drive rollers 17, 17' driven by a motor 16. 18, 18' are pinch rollers. The motor 16 is driven by a drive circuit 19 in which the output of an oscillator O ₁ or O ₂ is incorporated in a transmission hang-up logic circuit 7.
It is given through the contact re ₁ of the RE relay. oscillator
Assume that the frequency of O ₁ is lower than that of oscillator O ₂ .
When the device is in the transmitting state, the motor 16 rotates at a low speed because the contact re ₁ is connected to the oscillator O ₁ side.
The original 15 is sent at a predetermined reading speed. Manuscript 1
The calligraphy information shown in FIG. 5 is obtained by reflecting light emitted from a light source 20 on the document surface through a slit 21, and receiving the reflected light by a photoelectric conversion element 23 via a mirror 22. Whether or not the original 15 exists at the reading position, that is, the position of the slit 21, is determined by directing the light from the light source 20 to the optical fiber tube 24.
Detection is made by receiving the light through the photoelectric conversion element 25. If the other device hangs up, e.g.
When _rb1 is made (see FIG. 2A) and the document 15 is present at the reading position, the flip-flop 26 of the transmitting hang-up logic circuit 7 is set;
RE relay is activated. As a result, the contact re ₁ is switched to the oscillator O ₂ side, so the motor 16 rotates at high speed, and the original 15 is quickly removed from the reading position. At the same time, when the RE relay is activated,
Contact re ₂ makes buzzer 27 and lamp 2
8 is connected to power and informs the operator that the device is requesting a retransmission.

It will be easily understood that the functions of the recording paper speed switching of the plotter 4 and the reception hang-up logic circuit 8 explained in FIG. 1 can also be realized with the same circuit configuration as in FIG.

Furthermore, we have so far explained the case where when the recipient's facsimile device hangs up, the transmitted original or recording paper is fast-forwarded and removed from its reading position or recording position. If the stylus is wound upward and rotating (for example, see the device in Japanese Patent Application No. 1982-91414), the same effect cannot be obtained even if the stylus is moved to the reading or recording start position. Needless to say.

As is clear from the above description, according to the facsimile device according to the present invention, when the line is disconnected by the other party's device during calligraphic communication or when the polarity of the line is reversed, it can be detected and read. Alternatively, the recording state can be quickly restored to its initial state, and subsequent communication can be performed without any hindrance.Furthermore, since the own device also disconnects the line in response to an abnormality in the line of the other device, the line It has the advantage of being owned for a short time and having little impact on others.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention, FIG. 2 is a specific example of the hang-up detection circuit in FIG. 1, and FIG. 3 is a specific example of the scanner, transmission hang-up logic circuit, and alarm device. . 1... Line control unit, 2... Modem, 3... Document/image information processing unit, 4... Printer, 5... Scanner,
6...Line hangup detection circuit, 7...Transmission hangup logic circuit, 8...Reception hangup logic circuit, 9...Alarm device.

Claims (1)

[Claims] 1. In a facsimile device that performs calligraphic communication via a communication line, a polarity reversal detection means for detecting polarity reversal of the line, a detection means for detecting whether or not a transmitted original or recording paper is present at a reading or recording position, and this It has a logic means which inputs the detection result of the detection means and the polarity reversal detection means,
If the polarity reversal detection means detects the polarity of the line at the time when the detection means detects that the transmission document or recording paper is present at the reading or recording position, the output of the logic means determines whether the communication A facsimile apparatus is characterized in that the facsimile apparatus prepares for the next transmission or reception by completing the transmission and ejecting the transmission original or recording paper from the reading or recording position.