Abstract:
A memory-equipped facsimile machine wherein image data read by a scanner device is once stored in a memory and is then retrieved therefrom for transmission to another facsimile via a telephone line. In order to disperse working load imposed to a microcomputer and to increase a transmission speed, the reading of the image on a document is performed during call estabishing and message procedure phases as opposed to reading during a beginning-of-message procedure phase. The microcomputer instructs the scanner device to read the document in the call estabishing procedure phase and then to stop reading the document in the beginning-of-message procedure phase. The microcomputer further instructs the scanner device to resume reading the document in the message procedure phase C.

Description:
This is a continuation of application Ser. No. 07/559,048 filed Jul. 30, 1990. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention relates to a memory-equipped facsimile machine wherein text data read by a scanner device is once stored in a memory and is then retrieved therefrom for transmission to another facsimile via a telephone line. 
     As is well known in the art, when a document is to be faxed, the document is scanned by a scanner device of the sending facsimile wherein a material contained on the document is translated into an electrical signal on a pixel basis. The receiving facsimile receives the electrical signal and reproduces the original document. 
     Various kinds of facsimile machines have different transmission systems and transmission speeds, and besides a facsimile machine has a multiplicity of communication capabilities in terms of modulation system, transmission speed, line density, etc. Therefore, it is necessary that those communication capabilities of both the sending and receiving facsimiles be recognized by each other and that a relevant communication system be established prior to faxing. To this end, a predetermined transmission sequence is essential when facsimile communication is performed. Such transmission sequence includes phase A for call establishing procedure, phase B for beginning-of-message procedure, phase C for message procedure, phase D for end-of-message procedure, and phase E for calling retrieval procedure. Each phase is divided into a multiplicity of blocks each containing signals for a common project. 
     FIG. 6 is an example of a standard transmission sequence pursuant to CCITT recommendation. In FIG. 6, CED is a called station identification signal representing that the called station is of non-voice terminal. DIS is a digital identification signal representing that the called station has a standard CCITT receiving capability. DCS is a digital command signal representative of a digital set command responsive to a standard function identified by the DIS signal. TCF is a training check signal which checks whether or not the channel is available for a given transmission speed upon confirming the training of a modem. CFR is a confirmation-to-receive signal sent from the sending facsimile to the receiving facsimile confirming that the facsimile machine is ready for reception. MESSAGE is an image signal picked up from a document to be transmitted. EOP is an end-of-procedure signal indicating that the pages of the documents are ended and that no further pages follow. MCF is a message confirmation signal produced from the receiving facsimile indicating that the message reception has been completed. DCN is a disconnect signal which indicates the start of phase E. 
     In conventional facsimile machines, scanning of the document and production of the image signal generally start with phase A. However, due to a great deal of processing for producing the image signal and transmitting the same, transmission takes a long time and thus the cost of a communication is increased. One proposed solution for this problem is adoption of an advanced reading wherein reading of the document is the started immediately after the settlement of the communication mode in phase B. However, even in the advanced reading, a high speed transmission cannot be accomplished because a large number of signals are to be detected in phase B and a great deal of processing is outstanding for a central processing unit equipped with the facsimile machine. 
     SUMMARY OF THE INVENTION 
     The present invention has been made to solve the above-mentioned problem, and it is an object of the invention to provide a facsimile machine with a high speed transmission capability. 
     Briefly and in accordance with the present invention, the reading operation by a scanner device is performed during phases A and C rather than during phase B, so that a working load imposed to a microcomputer in phase B is reduced and the working load is, as a whole, dispersed. 
     In the present invention, as shown in FIG. 1, there is provided a facsimile machine which comprises reading means R for reading an image on a document and outputting image data, storage means M for storing the image data, the image data stored therein being retrieved therefrom and modulated for transmission to another facsimile machine via a communication line, advanced reading means A for issuing an instruction to the reading means R to start reading the image on the document and to store the image data in the storage means M during a period of time from booting of the facsimile machine until establishment of communication to the another facsimile machine, reading stopping means B for issuing an instruction to the reading means R to stop reading the image on the document during a period of time from the establishment of communication to the another facsimile machine until a time when the image data stored in the storage means M can be transmitted to the another facsimile machine, and reading resuming means C for issuing an instruction to the reading means R to resume reading the image on the document when the image data stored in the storage means M can be transmitted to the another facsimile machine. 
     In the facsimile machine thus arranged, the image on the document is read by the reading means R during two different phases. Therefore, the working load imposed to a microcomputer is dispersed and a high speed facsimile transmission can be accomplished. 
     According to another aspect of the invention, there is provided a method of reading an image on a document with a scanner device incorporated in a facsimile machine wherein transmission of image data produced from the scanner device is transmitted pursuant to a predetermined transmission sequence comprising phases A, B, C, D and E, the method comprising the steps of checking whether a start switch provided in the facsimile machine is depressed for transmission of the image data to another facsimile machine, performing reading operation of the image on the document if the start switch is depressed, checking whether phase B is detected, stopping the reading operation if phase B is detected, checking whether phase C is detected, resuming the reading operation if phase C is detected, checking whether phase D is detected, and stopping the reading operation if phase D is detected. 
     The above and other objects, features and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which a preferred embodiment of the present invention is shown by way of illustrative example. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a block diagram illustrating an inventive concept; 
     FIG. 2 is a cross-sectional diagram illustrating a facsimile machine according to the present invention; 
     FIG. 3 is a perspective view illustrating the facsimile machine according to the present invention; 
     FIG. 4 is a block diagram illustrating a preferred embodiment of the present invention; 
     FIG. 5 is a flow chart for illustrating operational sequence of the present invention; and 
     FIG. 6 is a diagram illustrating a typical communication sequence. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     In the following description, the terms &#34;front&#34;, &#34;rear&#34;, &#34;upper&#34;, and &#34;lower&#34; are used to define the various parts of the facsimile machine when it is oriented in a direction in which it is intended to be used. 
     As shown in FIG. 3, a facsimile machine has an operation panel 32 in the upper portion thereof. The operation panel 32 includes twelve keys 38 arranged in 3-lines and 4-rows for allowing input of a telephone number, a start key arranged at the right side of the keys 38, and five mode setting keys 30 used for setting various modes. A liquid crystal display (LCD) 41 is provided near the operation keys 30 for displaying a mode set by the mode setting key 30 or a telephone number. Document receiving portion 34 is formed in front of the operation panel 32, on which the documents to be transmitted are placed face down. A hand set 36 of a telephone is mounted on the left side of the facsimile machine. 
     In the lower portion of the operation panel 32, there is provided, as shown in FIG. 2, a substrate on which are mounted electronic components (not shown) electrically connected to the operation keys 30. A shaft 3 is provided in the lower portion of the operation panel 32 for allowing the operation panel 32 to be opened. 
     An intimate contact type image sensor 11 is provided beneath the operation panel 32 and a paper retaining member 4 is disposed above the image sensor 11 for retaining the document against the image senor 11. The retaining member 4 is enclosed and supported by a supporting member 1a and is downwardly biased by a spring 5 suspended between the supporting member 1a and the retaining member 4. The image sensor 11 is fixedly secured to a supporting member 12 by means of an L-shaped attachment 13. The supporting member 12 is fixedly secured to a frame of the facsimile machine. 
     The image sensor 11 includes in its interior a light emitting element 21, a light receiving element 23 and a self-focusing lens 22. The image sensor 11 extends in a direction transverse the width of the document and has a length substantially equal to the width of the document of, for example, a normal size (A4 size). Feed roller 14 and discharge 15 are rotatably disposed in the front and rear of the image sensor 11 (in left and right sides of the image sensor 11 in the cross-section of FIG. 2) and rollers 16, 17 are disposed above the rollers 14, 15, respectively. These rollers serve to feed the document in the direction orthogonal to the widthwise direction of the document. 
     In operation, when the document is inserted (from left side in FIG. 2), it is conveyed by the rollers 14, 16 toward the image sensor 11 and is interposed between the retaining member 4 and the image sensor 11. The material (text, graphic, photograph, etc.) contained in the document is sequentially picked up by the image sensor 11 on line basis while intermittently advancing the document. When the leading edge of the document is brought into abutment with a discharge roller 15, the document is discharged by the rollers 15, 17 out of the facsimile machine. 
     An electrical arrangement of the facsimile will be described with reference to FIG. 4. The facsimile includes a control section made up of a microcomputer (hereinafter referred to as &#34;CPU&#34;) 40, a read-only memory (ROM) 44, and a random access memory (RAM) 42. The facsimile further includes a modem 50, a printer unit 46, a scanner unit 48, an operating unit 54, and a telephone unit 56, all of which are connected to the CPU 40. The modem 50 is connected to a telephone line through a network control unit (NCU) 52. 
     The modem 50 serves to demodulate the signal received via the telephone line in the reception mode and to modulate the transmission signal in the transmission mode. The scanner unit 48 includes the image sensor 11 which picks up the image on the document and provides an analog image signal, and a digitizer for digitizing the analog image data into a binary format while comparing the level of the analog image signal with a threshold level. The digital image signal obtained from the scanner unit 48 is sent to the CPU 40. 
     The printer unit 46 serves mainly to reproduce the document when the document is received from another facsimile. A thermal printer is used in this embodiment. 
     In the ROM 44, there is stored a program for controlling transmission/reception in accordance with a predetermined sequence pursuant to CCITT recommendation, and a program for controlling operations of the scanner unit 48. RAM 42 is used to selectively store the transmitting image data produced from the scanner unit 48 and the reception image data received from another facsimile. In the transmission mode, the image data stored in the RAM 42 is fetched and is subjected to data compression. The resultant data is modulated in the modem 50 for transmission. On the other hand, in the reception mode, the reception image data is demodulated by the modem 50 and the resultant data is stored in the RAM 42. Decoded data is also stored in the RAM 42. For printing the reception image data, the CPU 40 instructs to read one line image data out of the RAM 42 and to send it to the printer unit 46. 
     Image reading operation performed by the scanner unit 48 will be described with reference to the flow chart shown in FIG. 5. 
     When the start key is depressed (step 1), the CPU 40 rotates the rollers 14, 15, 16, 17 to feed the document and instructs the image sensor 11 to pick up the image on the document on line basis (step 2). Next, the CPU 40 checks whether or not the present phase is phase B (step 3). Detection of phase B is made when the DIS (digital identification signal) is received in the case of GIII mode procedure. If the decision made in step 3 is YES, the reading operation is stopped (step 4). Next, the CPU 40 checks whether the present phase is phase C (step 5). The detection of phase C is made when the CFR signal is received in the case of GIII mode procedure. If phase C has been detected, the CPU 40 resumes the reading operation (step 6). Next, the CPU 40 checks whether the present phase is phase D (step 7). The detection of phase D is made on the basis of the EOM (end-of-message) signal or MPS (multipage) signal or EOP (end-of-procedure) signal in the case of GIII procedure. When phase D is not detected in step 7, the processing in step 6 is continuously carried out whereas when phase D is detected, the reading operation is terminated (step 7). In response to the phase D indicative signal, the CPU 40 determines the processing to follow (step 8). Specifically, in the case of an EOM signal, the routine returns to step 3. In the case of a MPS signal, the routine returns to step 5, and in the case of an EOP signal, the routine advances to phase E. 
     In the reading sequence described above, steps 1, 2 and 3 constitute advanced reading means, steps 4 and 5 constitute reading stopping means, and steps 6, 7 constitute reading resuming means. 
     As described, the CPU 40 instructs reading of the document in phases A and C. Reading of the document is not performed in phase B in which a number of signal exchanges between sending and receiving facsimiles are performed, whereby the working load imposed to the CPU 40 is dispersed. 
     In accordance with the present invention, the duration of phase B is shortened and, thus a higher speed facsimile transmission can be accomplished in comparison with the case where the reading of the document is performed in phase B.