JPS62276961A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To remove a transmission original or a recording paper sheet quickly if a line hangs up during the communication of document information by providing a hang-up detection circuit. CONSTITUTION:With a facsimile equipment in the receiving state, when an opposite equipment hangs up, a signal representing it is given from a hang-up detection circuit 6 to a reception hang up logic circuit 8. In this case, a signal representing the presence of recording paper still in existence in a plotter 4 is fed to the circuit 8 through a line 12, then a '1' signal is sent to an output line 14 from the circuit 8. A line control section 1 restores the device in the hang-up state by the '1' signal of an output line 14, and the plotter 4 switches the feeding speed of recording paper to a high pseed thereby removing the recording paper from the recording position quickly. That is, the equipment is restored to attain recalling from the opposite device.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention The present invention detects, in a facsimile machine that uses a general telephone line, when an abnormal state such as polarity reversal of the line occurs during the transmission of calligraphic information. The present invention relates to a facsimile machine that ejects a document or recording paper at high speed.

Conventionally, facsimile communication systems have been proposed that use general telephone lines to transmit document and image information unattended.

1 usually in this type of system.

When the sending device finishes transmitting the desired calligraphy and drawing information and the document is configured from the reading position, the device automatically returns to the off-hook state, and at this time, the receiving device also detects that the recording paper is in the recording position. If the sending device hangs up, it will be detected in some way and the device will be restored to the 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. but,
If an abnormal condition occurs during the transmission of calligraphy information, the following problems will occur.

In general, abnormal conditions may occur during the transmission of document and image information using the facsimile communication method described above: (1) A power outage occurs at the other party's station.

(2) When many errors are found in the received data at the other station, that is, when the line condition is poor, and the receiving device hangs up; (3) When the operator performs an erroneous operation and the device hangs up. (4) A hang-up due to a malfunction in the switching equipment; (5) The polarity of the line is reversed. In this case, the device on which the abnormality was detected will quickly restore the hung-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 JM manuscript or recording paper of both devices still exists at the reading position or recording position. this is,
It means that the device is busy, and from now on,
This means that it is impossible to automatically communicate with these devices. It is clear that it is not desirable for this state to continue for a long time. Furthermore, when such an abnormality occurs, it is necessary to restart the document/image communication, but since one 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 It is an object of the present invention 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 transmitting/receiving apparatus according to the present invention. In the figure, a general telephone line is connected to a line control section 1. The line control unit 1 is a device that controls the telephone switching network, and performs tasks such as sending out dial pulses during transmission, detecting ringing signals during reception, and forming a DC circuit. 2 is a modem, 3 is a calligraphic information processing unit, 4 is a
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 station and a ringing signal arrives through the telephone line, the ringing signal is detected by the line control section 1, and the hook switch provided in the control section 1 is activated (i.e., on-hook). A DC circuit is formed between the station and the other station. The drawing information arriving from the line is sequentially supplied to the drawing information processing section 3 through the control section 1 and the modem 2. Upon reception, the processing unit 3 expands the received calligraphy information and converts it into an electric 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 document information from the device to the other party's facsimile machine, the hook switch of the line control section 1 is first turned on and a dial pulse of the other party's station is sent. At transmission J7, main and sub-scanning and conversion into calligraphy information are performed by the scanner 5, 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 calligraphic information and also performs operations related to the entire system.

The document and image information compressed by the document and image processing section 3, which also establishes synchronization with the other party, is transmitted to the telephone line through the modem 2, line n; and control section 1.

This type of facsimile transmitting and receiving apparatus is well known.

Further detailed explanation 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, and when the other party's line control unit hangs up, the ``1'' signal is raised. The transmission hangup logic circuit 7 is supplied with a signal indicating whether or not a document is present at the reading position from the scanner 5 via a line 11. A signal indicating whether recording paper is present in the plotter 4 is supplied from the plotter 4 to the logic circuit 8 via a line 12. Reference numeral 9 denotes an alarm device that warns the operator that retransmission will be performed. be.

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, and at the same time, the transmission is in progress.
Line 1 is a signal indicating that there is still a document at the reading position.
1 from the scanner 5 via the hang-up logic circuit 7
, the l/I 11 signal is sent from the transmit hangup logic circuit 7 to the output line 13. This output 5
The "1" signal on 13 is the line controller 1 and scanner 5.
Shiko is supplied. As a result, the line control unit 1 upgrades the device and disconnects it from the line, and also the scanner 5
switches the document feeding speed to high speed and quickly removes the transmitted M document from the reading position. Further, the 11111 signal on the output line 13 is also supplied to the alarm device 9, and at this time the alarm device 9 issues an alarm to the operator that retransmission is required.

Similarly, when the facsimile machine is in the receiving state, when the other party's machine hangs up, a signal indicating this is sent from the hangup detection circuit 6 to the reception A hangup logic circuit 8.
given to. At this time, if a signal indicating that the recording paper is still in the plotter 4 is supplied to the reception hangup logic circuit 8 through the line 12, a 111'' signal is sent from the reception hangup logic circuit 8 to the output line 14. In response to the "1" signal on the output line 14, the line control unit 1 restores the apparatus to the hang-up state, and the plotter 4 switches the feeding speed of the recording paper to high speed.

Immediately remove the recording paper from the recording position. That is,
This means that the device has been restored to a state where it can be called again by the other device.

Figure 2 shows various specific examples of hang-up detection circuits6.
In general, in facsimile systems that use telephone lines, the means to detect a hang-up on the other party's device is as follows:
(1) A method based on line carrier disconnection, (2) A method based on line polarity restoration, (3) A method based on (1) level fluctuation on the line, (4) A method based on a combination of two or more of the above methods, etc. Here, the detection method based on carrier disconnection is a method that utilizes the fact that the carriers that are continuously sent out from the transmitter suddenly disappear when a hang-up occurs.Also, the detection method based on polarity recovery The method utilizes the fact that when the line is connected to the called party, the voltage polarity between both lines of the calling party's office line is reversed, and if the called party hangs up, the voltage polarity of the calling party is restored. The detection method based on level fluctuations utilizes the fact that a closed loop is formed by the hybrid coil when a line connection is established, and that the closed loop is broken due to a hang-up.In other words, a closed loop is established. 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 the signal is hung up and the output level at the transmitting end when the loop is broken.

FIG. 2(A) is a specific example of a hang-up detection circuit using polarity reversal. However, due to its principle, this only detects that the called party has hung up. In the figure, rc is a contact for closing the DC circuit, and when the contact rCt is closed, the line is connected by the DC resistance of the coil T, and connection with the exchange line is established. rd, to rd3 are contacts that operate later than the contact rc1 in order to avoid transient characteristics during the operation of the contact rC1. Contact re1 and contacts rd□ to rda 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 and contacts re1. Assume that rd□l rd3 is kept on and contact rd is kept off. At this time, the voltage polarity of the line is positive on the L1 side and negative on the L2 side, and the RAl relay operates, and its contact ra
At the same time, the contact ra2 is made. The RLl relay does not work due to diode D2. Now, when the other party rings up, the voltage polarity on the line is reversed. As a result, the 1-B relay operates and its contact rb1 is made.

The contact rb1 is connected to the line 10 described in FIG. 1, and when the contact rb1 is made, a signal H.U-1 is sent to the line 10 indicating that the other party is hung up. When the contact rC is restored to the OFF state, the RAl relay self-holding is released and the RBl relay is restored.

FIG. 2(B) is a specific example of a hang-up detection circuit due to carrier disconnection, which detects only hang-up on the transmitting side. In the figure, among the signals taken into the line control section 1, carriers are detected by passing through an AGC amplifier AMP, a bandpass filter BPF, and a high frequency amplifier AMP2. The carriers thus detected are converted into a DC signal by a rectifier circuit and a low-pass filter LPF, and then sent to the output side through a threshold circuit SCI+. While there is a carrier on the line, the output of the threshold circuit 5C11 prohibits activation of the gate G, and when the carrier on the line is disconnected, the output of the threshold circuit SCI+ is reduced, as explained in FIG. A signal H-U-2 is sent on line 10 indicating that the other party is hung up.

FIG. 2C shows a specific example of a hang-up detection circuit that utilizes output level changes at the transmitting end, and this is most suitable for short-distance applications since there are limitations on communication links. The circuit configuration is almost the same as that shown in Fig. 2 (B) above, and the output signal from the line control unit 1 is amplified by the amplifier AMP, then converted to a DC signal by the rectifier circuit and low-pass filter LPF, and then the threshold It is sent to the output line 10 through the circuit SCH. That is, when a hang-up occurs on the transmitting side and the voltage level on the line changes, this is detected by the threshold circuit SCH, and a signal H indicating that the other party's device has hung-up is generated at 1iA10 explained in FIG. -U-3 is sent.

As is clear from the explanation so far, FIGS. 2(A) to (
Both of the methods in C) can only detect a hang-up state on either the outgoing call or the incoming call, so these methods are actually combined.

It is necessary for the device to be able to handle both incoming and outgoing calls. FIG. 2(D) is a diagram for explaining this. That is, FIG. 2(D) shows the hang-up detection signals H-U-1 and H-U- explained in FIGS.
2, H-U-3 are coupled to the OR circuit OR, which means that if a hang-up is detected in any of them, it will be sent to the output line 10. In addition to the above, in normal telephone systems, if one subscriber hangs up, a busy tone is emitted from the switching center to the other subscriber. You can also know the up. This method has the feature that it is possible to detect a hang-up of the other party regardless of the status of the outgoing call or the incoming call.

FIG. 3 shows a specific example of each part of the scan 5, transmission hang-up logic circuit 7, and retransmission alarm device 9 in FIG. 1. In FIG. is sent in the direction of the arrow. 18.
18° is a pinch roller. The motor 16 is the drive circuit 1
The output of the oscillator 01 or 02 is applied to the drive circuit 19 via a contact r8 of an RE relay built in the transmission hang-up logic circuit 7. It is assumed that the frequency of oscillator 01 is lower than that of oscillator 02. When the apparatus is in the transmitting state, the motor 16 rotates at a low speed because the contact point is connected to the side of the oscillator 9, and the original 15 is sent at a predetermined reading speed. Calligraphy information on the original 15 is obtained by reflecting light emitted from a light source 20 on the original surface through a slit 21 and receiving the reflected light by a photoelectric conversion element 23 via a mirror 22. Whether or not the document 15 exists at the reading position, that is, the position of the slit 21 is detected by receiving the light from the light source 20 through the optical fiber tube 24 and into the photoelectric conversion element 25 . When the other device hangs up and, for example, contacts RB fail (see Figure 2 (A)), and the M document 15 is present at the reading position, the flip-flop 26 of the transmission hang-up logic circuit 7 is set, and the RE relay is activated. is driven. As a result, the contact re1 oscillates *0. Since the motor 16 is switched to the side, the motor 16 rotates at high speed, and the M document 15 is quickly removed from the reading position. At the same time, when the RE relay is driven, the contact re□ is made and the buzzer 27 and lamp 2
8 is connected to power and informs the operator that the device is requesting a retransmission.

Note that the functions of the recording paper speed switching of the plotter 4 and the reception hang-up logic circuit 8 explained in FIG.
It will be easily understood that this can be realized with a circuit configuration similar to that shown in the figure.

Furthermore, we have so far explained the case where when the other party's facsimile machine hangs up, the transmitted original or recording paper is fast-forwarded and removed from its reading position or recording position. When it is wound on a drum and rotates (for example, patent application 1977-
Needless to say, the same effect can be obtained even if the stylus is moved to the reading or recording start position in the device of No. 91414).

As is clear from the above description, according to the facsimile apparatus according to the present invention, when the line is disconnected by the other party's device during document/image communication, or when the polarity of the line is reversed,
Detect it and read or record the state to its initial state.
The island can be quickly restored, and subsequent communications can be carried out without any problems.Furthermore, since the own device also disconnects the line in response to an abnormality in the other party's line, the line ownership time is short, and communication with other devices is possible. This has the effect of having little impact on

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the device of the present invention, and FIG.
The diagram shows a specific example of the hang-up detection circuit in FIG. 1, and FIG. 3 shows a specific example of the scanner, transmission hang-up logic circuit, and alarm device. DESCRIPTION OF SYMBOLS 1... Line control unit, 2... Modem, 3... Document/image information processing unit, 4... Plotter, 5... Scanner, 6... Line hang-up detection circuit, 7...
Transmission hang-up logic circuit, 8... Reception hang-up logic circuit, 9... Alarm device. Figure 2 (8) Figure 2 (C) Figure 2 (Di ○ρ

Claims (1)

[Claims] A facsimile device that performs calligraphic communication via a communication line has a detection means for detecting a polarity reversal of the line, and when the detection means detects a polarity reversal of the line while communicating calligraphy information, the communication is terminated. A facsimile apparatus characterized in that the facsimile apparatus returns to an initial state in preparation for the next transmission or reception.