JPH05167814A - Facsimile communication system and facsimile communication method - Google Patents

Abstract

PURPOSE:To suppress the waste of a power relating to preheating of a fixing heater by transmitting preheating time information of the fixing heater by adding on the call control information of an ISDN corresponding to the null capacity of image memory from a reception side terminal and re-transmitting the preheating time information from a transmission side terminal to the reception side terminal after the lapse of preheating time. CONSTITUTION:No preheating of the fixing heater 14 is performed at the facsimile equipment 1 of a reception station, and when 'call setting' from a transmission station is received. 'call issuance' is returned from the reception station, thereafter, the fact that no preparation by the fixing heater 14 is completed and time information until preheating preparation is completed are transmitted by attaching on user-user information during 'disconnection'. After the 'release' of a call is executed, the preheating of the fixing heater 14 is started at the reception station, and received user-user information is decoded at the transmission station, then, a standby of the station is set until the preheating preparation is completed, and a call setting procedure is started again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile communication system and a facsimile communication system, and more particularly to ISDN.
TECHNICAL FIELD The present invention relates to a facsimile communication system and a facsimile communication system for transmitting / receiving image information via a telephone.

[0002]

2. Description of the Related Art In a conventional electrophotographic G3 facsimile machine, it is necessary to heat a fixing heater.
The fixing heater is always preheated to a constant temperature so that the image information received and received can be immediately recorded. However, since a certain amount of power is required for preheating, power is wasted when reception frequency is low. In order to avoid this waste of electric power, a method is known in which received image information is temporarily stored in an image memory without being preheated and is recorded and output.

[0003]

However, in such a conventional electrophotographic recording type G3 facsimile apparatus, the image information once received is stored in the image memory without preheating the fixing heater. Because it was
When the free space of the image memory is exhausted, there is a problem that the fixing heater is not preheated so that the image information cannot be received.

Therefore, the Japanese Patent Application No. 1 filed by the applicant earlier.
As in the facsimile machine described in No. 287535, when the call signal from the line is received, preheating of the fixing heater is started, and when the temperature rises to the heat generation temperature required for image recording, the line is connected to display the image. Some receive and record information. However, in the recording method of this facsimile apparatus, it is not possible to take a long time from calling the line to connecting the line. Therefore, a fixing heater having a high temperature rising speed must be used. It is difficult to use for facsimile communication. In addition, in order to apply to the speed of G4 facsimile communication,
Since it is necessary to set the preheating temperature to a higher temperature, there is a problem that power consumption is wasted.

Therefore, according to the present invention, the receiving side facsimile terminal adds the preheating time information of the fixing heater to the call control information of the ISDN according to the free space of the image memory and transmits it to the transmitting side facsimile terminal. The present invention provides a facsimile communication system and a facsimile communication method for suppressing an increase in communication cost and power waste associated with preheating of a fixing heater by retransmitting to the receiving facsimile terminal after the preheating time has elapsed according to the preheating time information. To aim.

[0006]

The invention according to claim 1 is
The sending side facsimile terminal and the receiving side facsimile terminal are I
Connected via SDN, the sending facsimile terminal
The ISDN call control procedure is executed to perform facsimile communication with the receiving facsimile terminal via ISDN.
In a facsimile communication system that sends and receives image information, the receiving-side facsimile terminal stores an image memory that stores the image information received from the transmitting-side facsimile terminal and a recording that fixes the stored image information on recording paper by the heat generated by a fixing heater. Part, temperature detecting means for detecting the heat generation temperature of the fixing heater, and when the heat generation temperature detected by the temperature detection means does not reach a predetermined preheat temperature at the time of receiving a call from the transmitting side facsimile terminal, the preheat temperature Information forming means for forming call control information at the time of ISDN call connection to which preheating time information until reaching is reached, and the transmitting side facsimile terminal analyzes the call controlling information transmitted from the receiving side facsimile terminal. Information analyzing means and a time measuring means for measuring the elapse of the preheating time obtained by analyzing the preheating time information added to the call control information. When the receiving side facsimile terminal transmits the call control information to which the preheating time information is added, the transmitting side facsimile terminal interrupts the call connection and retransmits to the receiving side facsimile terminal after the preheating time elapses, According to a second aspect of the present invention, in the first aspect of the present invention, the receiving side facsimile terminal is provided with a memory capacity detecting means for detecting an available capacity of the image memory, and the receiving side facsimile terminal has an available capacity of the image memory. The call control information relating to the preheating temperature of the fixing heater is transmitted when the value becomes equal to or lower than a predetermined value. According to the invention of claim 3, the transmitting side facsimile terminal and the receiving side facsimile terminal pass through ISDN. The facsimile terminal on the transmitting side executes the ISDN call control procedure to communicate with the facsimile terminal on the receiving side via ISDN. In a facsimile communication method in which image communication is performed by transmitting and receiving image information by a facsimile, the receiving side facsimile terminal stores the image information received from the transmitting side facsimile terminal and the accumulated image information by heat generated by a fixing heater. A recording unit for fixing to a recording paper, a temperature detecting means for detecting a heat generation temperature of the fixing heater, and a heat generation temperature detected by the temperature detection means reaches a predetermined preheat temperature when an incoming call is made from the transmitting side facsimile terminal. If not, information forming means for forming call control information at the time of ISDN call connection for adding preheating time information until reaching the preheating temperature, and memory capacity detecting means for detecting free space of the image memory are provided, and transmission is performed. An information analyzing means for analyzing the call control information transmitted from the receiving facsimile terminal, and the call control information. And a time measuring means for measuring the elapse of the preheating time obtained by analyzing the preheating time information added to, the free space of the image memory becomes less than a predetermined value at the receiving facsimile terminal, and the heat generation temperature reaches the predetermined preheating temperature. If not, the call control information for disconnecting the call to which the preheat time information is added is transmitted, and when the sending facsimile terminal receives the call control information, the call is disconnected and the receiving facsimile terminal after the preheat time has elapsed. It is characterized by re-sending to.

[0007]

According to the first aspect of the invention, the transmitting facsimile terminal executes the ISDN call control procedure to perform facsimile communication with the receiving facsimile terminal via ISDN to send / receive image information. In a facsimile communication system, an image memory for accumulating received image information, a recording unit for fixing the accumulated image information on recording paper by heat generation of a fixing heater, and a temperature detection for detecting heat generation temperature of the fixing heater in a receiving facsimile terminal And the call control information at the time of the ISDN call connection that adds the preheating time information until the preheating temperature is reached when the detected heat generation temperature does not reach the predetermined preheating temperature at the time of receiving a call from the transmitting side facsimile terminal. And an information forming means for forming the preheating time information before the call connection with the receiving side facsimile terminal. When the added call control information is received, the information analysis means for analyzing the call control information and the timing means for measuring the elapsed preheat time are provided, and the preheat time information is added from the receiving facsimile terminal. When the call control information is sent, the sending facsimile terminal
After the call connection is interrupted and the preheat time has elapsed, the call is retransmitted to the receiving facsimile terminal.

Therefore, since the receiving side facsimile terminal does not preheat the fixing heater, power consumption can be suppressed and the transmitting side facsimile terminal is notified of call disconnection and preheating time information by ISDN call control information. Therefore, the communication procedure can be shortened and the communication cost of the facsimile communication system can be reduced. Claim 2
In the invention described in claim 1, in the invention described in claim 1, the receiving side facsimile terminal is provided with a memory capacity detecting means for detecting an available capacity of the image memory, and the receiving side facsimile terminal has a predetermined free capacity of the image memory. When the value becomes equal to or less than the value, the call control information related to the preheating temperature of the fixing heater is transmitted.

Therefore, since the fixing side heater terminal does not preheat the fixing heater, the power consumption can be suppressed, and the receiving side facsimile terminal stores the received image information in the image memory according to the free space of the image memory. Alternatively, since the disconnection of the call and the preheating time information are notified to the transmitting side facsimile terminal by the ISDN call control information, the image information can be transmitted / received more efficiently, and the communication cost of the facsimile communication system can be reduced. it can.

According to the third aspect of the present invention, the facsimile terminal on the transmitting side executes the ISDN call control procedure to perform facsimile communication with the facsimile terminal on the receiving side via ISDN to send / receive image information. In the facsimile communication system, an image memory for accumulating received image information, a recording unit for fixing the accumulated image information to recording paper by heat generation of a fixing heater, and a temperature detection for detecting heat generation temperature of the fixing heater in a receiving facsimile terminal. And the call control information at the time of the ISDN call connection that adds the preheating time information until the preheating temperature is reached when the detected heat generation temperature does not reach the predetermined preheating temperature at the time of receiving a call from the transmitting side facsimile terminal. An information forming unit for forming and a memory capacity detecting unit for detecting a free space of the image memory are provided, and the transmitting side facsimile terminal is provided with The receiving side is provided with information analyzing means for analyzing the call control information transmitted from the receiving side facsimile terminal, and timing means for measuring the elapse of the preheating time obtained by analyzing the preheating time information added to the call control information. When the free space in the image memory of the facsimile terminal falls below a predetermined value and the heat generation temperature does not reach the predetermined preheat temperature, the call control information for disconnecting the call with the preheat time information added is transmitted, and the sender facsimile Upon receiving the call control information, the terminal disconnects the call and retransmits it to the receiving facsimile terminal after the preheating time has elapsed.

Therefore, since the receiving side facsimile terminal does not preheat the fixing heater, the power consumption can be suppressed, and the receiving side facsimile terminal stores the received image information in the image memory according to the free space of the image memory. Alternatively, the call disconnection information and the preheat time information are notified to the transmitting side facsimile terminal by the call control information of the ISDN, so that the image information can be transmitted / received more efficiently.
It is also possible to reduce the communication cost of the facsimile communication terminal connected to the SDN.

[0012]

EXAMPLES The present invention will be specifically described below based on examples. 1 to 5 are diagrams showing an embodiment of a facsimile apparatus to which the facsimile communication system and the facsimile communication system according to claims 1 to 3 are applied. Figure 1
FIG. 2 is a block diagram of the facsimile device 1, which includes a display / operation unit 2, a CPU 3, a ROM 4, and a RAM.
5, a plotter 6, a scanner 7, an encoding / decoding unit 8, a network control unit 9, a communication control unit 10, a user / user information decoding forming unit 11 and an image memory 12, and each unit is connected to a bus 13. Has been done.

The display operation unit 2 is provided with various operation keys such as a numeric keypad and a start key, and is also provided with a display (for example, a liquid crystal display). From the operation keys, various commands such as a transmission operation are input, and the display is displayed. The contents of the command input from the operation keys and various information notified from the facsimile machine 1 to the operator are displayed. CPU
The (Central Processing Unit) 3 controls each unit of the facsimile apparatus 1 according to the program in the ROM 4 to execute the sequence as the facsimile apparatus 1, and also executes the ISDN communication control processing of the present invention, which will be described later by a user / user. Decode information and form user-user information. Further, the CPU 3 has a function as a memory capacity detecting means for detecting the free capacity of the image memory 12, and has a built-in timer for measuring the elapse of the preheating time based on the preheating time data added to the received user / user information. It also has a function as a timekeeping means.

A ROM (Read Only Memory) 4 is a basic program for the facsimile apparatus 1 and the ISD of the present invention.
The N communication control program and the like are stored. RAM (Random A
The ccess memory 5 forms a memory area for storing various data when the sequence of the facsimile apparatus 1 is executed, and data required when executing the ISDN communication control program of the present invention (preheating of the fixing heater). A memory area for storing time data and free space data of the image memory 12) is formed.

An electrophotographic recording device is used as the plotter (recording unit) 5, and an electrostatic latent image is formed on the photoconductor by the light modulated based on the received image information, and an electrostatic latent image is formed. Toner is attached to the photoconductor and developed. The toner attached to the photoconductor is transferred onto a recording sheet, the recording sheet attached with the toner is conveyed to a fixing roller heated by a fixing heater 14, and the toner is fixed on the recording sheet by the fixing roller. The heat generation temperature of the fixing roller 14 is detected by the temperature detecting means 15.

The scanner 7 is, for example, a CCD (Ch
An image scanner using a large coupled device) is used, and the scanner 7 scans a document and reads image information of the document. The encoding / decoding unit 8 encodes the image information according to a predetermined encoding method, and also decodes the encoded image information.

The network control device 9 is controlled by the communication control unit 10 and is a so-called AA-NCU. The network control device 9 is connected to an ISDN (Integrated Services Digital Communication Network). The network control device 9 has a function of automatically receiving an incoming call from the ISDN and executing an ISDN call control procedure for performing an automatic outgoing call process to the ISDN.

The communication control unit 10 is an ISDN 64 kbps.
IS connected to the network control device 9 having a function of controlling two B channel lines and six 16 kbps D channel lines.
The communication control signal is exchanged with the partner facsimile machine via the DN, and the image information is exchanged with the partner facsimile machine connected to the ISDN. Further, the communication control unit 10 transfers the user / user information received from the partner facsimile machine during the ISDN call control procedure to the user / user information decoding / forming unit 11 and is formed by the user / user information decoding / forming unit 11. The transmitted user / user information is transmitted from the network control device 9 to the partner facsimile device via the ISDN.

The user / user information decoding forming unit (information forming means, information analyzing means) 11 decodes the preheating time data received and added to the user / user information, and adds the preheating time data to the user / user. It has the function of forming information. The image memory 12 is composed of a large-capacity hard disk device or the like, and mainly stores image information. Image memory 12
The image information for transmission and the received image information are accumulated in, and are read at a predetermined time to perform transmission processing, recording processing, and the like.

Next, the operation will be described. In this embodiment, the receiving facsimile terminal is the fixing heater 14 of the plotter 6.
When the user / user information for rejecting the reception at the time of an incoming call is formed based on the preheating temperature of the image memory 12 and the free space of the image memory 12 and is transmitted to the transmitting side facsimile terminal, the transmitting side facsimile terminal receives the received user / user. The facsimile communication process is based on the ISDN communication procedure of decoding the information, interrupting the continuation of the transmission, and re-transmitting after the preheat time has elapsed. The characteristic is that the facsimile communication process will be described below. It is assumed that the facsimile machine 1 shown in FIG. 1 is connected to both the transmitting side and the receiving side.

First, FIGS. 2 and 3 show communication protocols at the time of call setup and call release of ISDN.
I. (International Telegraph and Telephone Advisory Committee) 430, Q.I. 92
0, Q. 921, Q.I. 930, Q.I. 931 and JT-
I. 430, Q.I. 920, Q.I. 921, Q.I. 930,
Q. 931 based. FIG. 2 shows a call setup / release procedure when communication is performed on a normal ISDN B channel, and FIG. 3 shows a call setup / release procedure when reception is rejected from a receiving station.
The opening procedure is shown. In FIG. 2 and FIG. 3, the user / user information of this embodiment can be added except for “opening complete”.

In the facsimile apparatus 1 of this embodiment, normally, the fixing heater 14 is not preheated, and when the "call setting" is received from the transmitting station, the facsimile apparatus 1 of the receiving station is received.
After the "call" is returned, the information that the fixing heater 14 is not ready and the time information until the preheat preparation is completed is added to the user / user information in "disconnection" and sent. “Open” is executed. That is, in this embodiment, the facsimile communication process is executed by the receiving side facsimile terminal and the transmitting side facsimile terminal according to the communication protocol shown in FIG. After that, the receiving side facsimile terminal starts preheating of the fixing heater 14, and the transmitting side facsimile terminal waits for the time until the received user / user information is decoded and the preheating preparation is completed, and after that time, the call setting procedure is performed again. Is started, and a normal communication procedure is executed according to the communication procedure shown in FIG.

Normally, the receiving facsimile terminal does not reject this reception, but a method of accumulating the image information once received in the image memory 12 is executed, and only when the free space of the image memory 12 is less than a certain amount. The communication procedure for refusing reception is executed. Next, FIG. 4 will be described with reference to a flow chart of the transmission process in the transmission side facsimile terminal.

In FIG. 4, the transmission operation or reception by the operator is rejected on the display operation unit 2 and the processing is started after a lapse of a predetermined time. First, a "call setting" signal is transmitted (step P1), and the facsimile terminal of the other party sends the signal. Is checked (step P2). When a normal response is returned, the image information is continuously transmitted and terminated, and then the call "release" procedure is executed to terminate the transmission process (steps P3 and P4).

When the "cut" response is received (step P5), the user / user information added in the "cut" signal is decoded by the user / user information decoding / forming section 12 and the fixing heater 14 is operated. Also, a timer for measuring the elapsed time of the preheating preparation time is started (step P6), the call "opening" procedure is executed, and the main transmission processing is ended (step P6).
4). Then, after the preheating preparation time has elapsed, the retransmission process is executed again for the receiving facsimile terminal.

Further, FIG. 5 will be described with reference to the flowchart of the receiving process in the receiving side facsimile terminal. First, when the "call setting" signal from the sending facsimile terminal is detected (step S1), it is judged by the temperature detecting means 15 whether or not the preheating temperature of the fixing heater 14 has reached a constant value (step S2). When the preheating temperature has reached a certain value, a "response" signal prompting the continuation of the transmission is returned (step S3), the image information is received, and the plotter 5 records and outputs it on the recording paper (step S4). Then
It is judged whether or not the sending facsimile terminal is the party to which the user / user information has been sent (step S5). If not sent, a call "open" signal is returned, and if sent, the fixing heater 14 is preheated. Is turned off, the call "release" signal is returned, and this reception processing is ended (steps S6, S).
7).

On the other hand, if the preheat temperature of the fixing heater 14 has not reached a certain value in step S2, the free space of the image memory 12 is checked (step S8). If the free space is small, "call" is returned. Then, in step S9, the pre-heating preparation incomplete information of the fixing heater 14 and the pre-heating completion required time information are added to the user / user information to be added to the “disconnect” signal to be returned by the user / user information decoding forming unit 11 (step S10). .. Next, the preheat of the fixing heater 14 is started (step S11), the call "open" is returned, and the main reception process is ended (step S7).

When the image memory 12 has sufficient free space in step S8, a "response" signal for prompting continuation of normal transmission is returned (step S12), and image information is received in the image memory 12. (Step S13) The call "release" is returned and the reception process is terminated (step S7). By the above facsimile sending / receiving process, in the receiving side facsimile terminal, when the preheating temperature of the fixing heater 14 has not reached a certain value or when the free space of the image memory 12 is small, preheating preparation incomplete information and preheating of the fixing heater 14 It is only necessary to add the completion required time information to the user / user information and send it. At the sending side facsimile terminal, the information added to this user / user information is deciphered and the preheat elapsed time is measured by the timer and after the elapse. Since it is only necessary to retransmit, the facsimile communication procedure can be shortened on both the transmitting side and the receiving side, and the preheating operation of the fixing heater 14 can be omitted, so that the power consumption can be reduced. Further, even the facsimile apparatus 1 equipped with the plotter 5 using the electrophotographic recording apparatus can be connected to the ISDN and can be easily applied to the high speed communication processing of the ISDN.

[0029]

According to the first aspect of the invention, the facsimile terminal on the transmitting side executes the call control procedure of the ISDN to perform the facsimile communication with the facsimile terminal on the receiving side via the ISDN, and transmits the image information. In a facsimile communication system for sending / receiving, a receiving side facsimile terminal stores an image memory for accumulating received image information, a recording unit for fixing the accumulated image information on recording paper by heat generation of a fixing heater, and a heat generation temperature of the fixing heater. When an ISDN call is connected, the temperature detecting means for detecting and the preheating time information until reaching the preheating temperature are added when the detected exothermic temperature does not reach the predetermined preheating temperature when receiving a call from the transmitting side facsimile terminal. An information forming means for forming call control information, wherein the transmitting side facsimile terminal is connected to the receiving side facsimile terminal before the call connection, When the call control information to which the information is added is received, the information analysis means for analyzing the call control information and the timing means for measuring the elapsed preheat time are provided, and the preheat time information is added from the receiving side facsimile terminal. When the call control information is transmitted, the facsimile terminal on the transmitting side does not preheat the fixing heater on the facsimile terminal on the receiving side because the facsimile terminal on the transmitting side interrupts the call connection and retransmits it to the facsimile terminal on the receiving side after the preheating time elapses. Therefore, the power consumption can be suppressed and the call disconnection information and the preheat time information are notified to the transmitting side facsimile terminal by the call control information of ISDN, so that the communication procedure is shortened and the communication cost of the facsimile communication system is reduced. be able to.

According to the invention described in claim 2, in the invention described in claim 1, the receiving side facsimile terminal is provided with a memory capacity detecting means for detecting an available capacity of the image memory. When the free space of the image memory becomes less than the specified value, the call control information related to the preheating temperature of the fixing heater is transmitted. Therefore, the receiving side facsimile terminal does not preheat the fixing heater, so the power consumption is suppressed. At the same time, the receiving side facsimile terminal stores the received image information in the image memory according to the free space of the image memory, or notifies the transmitting side facsimile terminal of the call disconnection and preheat time information by the call control information of ISDN. Therefore, it is possible to more efficiently send and receive image information and reduce the communication cost of the facsimile communication system. It can be.

According to the third aspect of the present invention, the transmitting facsimile terminal executes the ISDN call control procedure to perform facsimile communication with the receiving facsimile terminal via ISDN to send image information. In the receiving facsimile communication system, a receiving side facsimile terminal detects an image memory for accumulating received image information, a recording unit for fixing the accumulated image information on recording paper by heat generation of a fixing heater, and a heat generation temperature of the fixing heater. When an incoming call is received from the temperature detecting means and the facsimile terminal on the transmitting side, when the detected heat generation temperature does not reach a predetermined preheat temperature, call control at the time of ISDN call connection for adding preheat time information until reaching the preheat temperature An information forming unit for forming information and a memory capacity detecting unit for detecting a free space of the image memory are provided, and the transmitting side facsimile terminal is The receiving facsimile includes information analyzing means for analyzing the call control information transmitted from the receiving side facsimile terminal, and timing means for measuring the elapse of the preheating time obtained by analyzing the preheating time information added to the call control information. When the free space in the image memory of the terminal falls below a predetermined value and the heat generation temperature has not reached the predetermined preheat temperature, the call control information for disconnecting the call with the preheat time information added is transmitted, and at the sending facsimile terminal. When the call control information is received, the call is disconnected and retransmitted to the receiving facsimile terminal after the preheating time elapses. Therefore, the receiving facsimile terminal does not preheat the fixing heater, so that power consumption can be suppressed. At the same time, the receiving facsimile terminal stores the received image information in the image memory according to the free space of the image memory, or the ISDN call control. Since the call disconnection and the preheating time information are notified to the transmitting side facsimile terminal by the information, the image information can be transmitted / received more efficiently, and the communication cost of the facsimile communication terminal connected to the ISDN can be reduced. it can.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a facsimile apparatus to which a facsimile communication system and a facsimile communication system according to the present invention are applied.

FIG. 2 is a normal call setup / execution performed by the communication control unit of FIG.
The figure which shows the communication protocol at the time of opening.

FIG. 3 is a diagram showing a communication protocol at the time of call setup / release according to the present invention, which is executed by the communication control unit of FIG. 1;

FIG. 4 is a flowchart of a transmission process according to the present invention when the facsimile apparatus of FIG. 1 is used as a transmission side facsimile terminal.

5 is a flowchart of a receiving process according to the present invention when the facsimile apparatus of FIG. 1 is used as a receiving facsimile terminal.

[Explanation of Codes] 1 Facsimile device 2 Display operation part 3 CPU 4 ROM 5 RAM 6 Plotter 7 Scanner 8 Encoding / decoding part 9 Network control device 10 Communication control part 11 User / user information decoding forming part 12 Image memory 13 Bus 14 Fixing heater 15 Temperature detection means

Claims (3)

[Claims] 1. A transmission side facsimile terminal and a reception side facsimile terminal are connected via ISDN, and the transmission side facsimile terminal executes a call control procedure of ISDN and facsimiles with the reception side facsimile terminal via ISDN. In a facsimile communication system that communicates and sends and receives image information, the receiving facsimile terminal stores an image memory that stores the image information received from the transmitting facsimile terminal, and the accumulated image information on the recording paper due to the heat generated by a fixing heater. A recording unit for fixing to the fixing unit, temperature detecting means for detecting the heat generation temperature of the fixing heater, and the heat generation temperature detected by the temperature detection means does not reach a predetermined preheat temperature at the time of receiving a call from the transmitting side facsimile terminal. At this time, the call control information at the time of disconnecting the ISDN call is added by adding the preheat time information until the preheat temperature is reached. And an information forming means for analyzing the call control information transmitted from the receiving side facsimile terminal by the transmitting side facsimile terminal, and preheating by analyzing the preheating time information added to the call control information. When the receiving side facsimile terminal transmits the call control information to which the preheating time information is added, the transmitting side facsimile terminal interrupts the call connection and receives the reception after the preheating time has elapsed. A facsimile communication system characterized in that it is retransmitted to a side facsimile terminal. 2. The invention according to claim 1, wherein the receiving-side facsimile terminal is provided with a memory capacity detecting means for detecting an available capacity of the image memory, and the receiving-side facsimile terminal has an available capacity of the image memory not more than a predetermined value. And a call control information relating to the preheating temperature of the fixing heater is transmitted. 3. A transmission side facsimile terminal and a reception side facsimile terminal are connected via ISDN, and the transmission side facsimile terminal executes a call control procedure of ISDN to facsimile with the reception side facsimile terminal via ISDN. In a facsimile communication method that communicates and sends and receives image information, the receiving facsimile terminal stores an image memory that stores the image information received from the transmitting facsimile terminal, and the accumulated image information on the recording paper due to the heat generated by the fixing heater. A recording unit for fixing to the fixing unit, temperature detecting means for detecting the heat generation temperature of the fixing heater, and the heat generation temperature detected by the temperature detection means does not reach a predetermined preheat temperature at the time of receiving a call from the transmitting side facsimile terminal. At this time, call control information at the time of ISDN call connection that adds preheat time information until reaching the preheat temperature is formed. An information forming means; and a memory capacity detecting means for detecting an available capacity of the image memory, wherein the transmitting side facsimile terminal analyzes the call control information transmitted from the receiving side facsimile terminal, and a call The pre-heating time information obtained by analyzing the pre-heating time information added to the control information is provided, and the receiving facsimile terminal has less than a predetermined amount of free space in the image memory, and the heat generation temperature is the predetermined pre-heating temperature. If it has not reached, the call control information for disconnecting the call with the preheat time information added is transmitted, and when the sending facsimile terminal receives the call control information, the call is disconnected and the reception side after the preheat time has elapsed. Facsimile communication method characterized by retransmission to a facsimile terminal.