JPS61131969A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To avoid disturbance of a picture by controlling variably a data input/output speed between a buffer memory in a main control section and a compression section and between the memory and an expansion section in response to the transmission speed so as to drive a power source such as a step motor at a nearly constant speed. CONSTITUTION:A data received by a line control section 5 is demodulated at a MODEM4 from a modulation signal into a compression coding data and the result is inputted to a buffer memory in the main control section 3. Then the compression coding data is transferred from the memory to the expansion section 6 in response to the transmission speed on a line according to the control of an input/output speed control section 9. The data is restored into the original binary data and fed to a print section 7. A sub scanning control section 8 drives a motor so that the recording paper is subject to subscanning at a speed corresponding to the transmission speed by the command from the speed control section 9, the print at a print section 7 is executed smoothly and the shear of printed positions is minimized.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention variably controls the input/output speed of data between a buffer memory in a main control unit, a reading unit, and a printing unit in accordance with the transmission speed on a line, thereby controlling original and recording speeds. A facsimile device (related to) which is designed to smoothly read paper and record scans, thereby preventing disturbances in image quality.

[Technical background of the invention]

FIG. 2 is a block diagram showing the configuration of a conventional general facsimile machine, which includes a reading section 1, a compression section 2,
The main control section 3, modem 4, line control section 5, expansion section 6, printing section 7, and sub-scanning control section 8 are constructed. The main control unit 3 is in charge of controlling the entire facsimile machine, and when a transmission request occurs, it instructs the modem 4 and line control unit 5 to establish a line, set the transmission speed, etc. prior to transmission. Performs line control. Next, the main control section 3 instructs the sub-scanning control section 8 to drive a driving means such as a step motor to perform sub-scanning of the document and start the reading operation of the document in the reading section 1. The binary data of the document read by this sub-scanning is compressed and encoded by the compression section 2 and input to the buffer memory in the main control section 3. The compressed code data input into this buffer memory is then transferred to the modem 4 and sent to a signal (
After being modulated, it is transmitted onto the line via the line control section 5.

On the other hand, during reception, data received by the line control section 5 is demodulated into compressed encoded data by the modem 4 and input to the buffer memory of the main control section 3.

Thereafter, the compressed encoded data is transferred from the buffer memory to the expansion section 6 and restored to binary data, and then supplied to the printing section 7 and conveyed in accordance with the driving of the step motor by the width scanning control section 8. Printed on recording paper. In this type of conventional device, in order to match the transmission speed on the line with the code generation and code restoration in the compression section 2 and the expansion section 6 that accompany the transmission and reception operations as described above, Using buffer memory
Since the data input/output speed between the buffer memory and the compression section 2 and expansion section 6 is limited by the capacity of the buffer memory, the sub-scanning control section 8
It has been necessary to perform sub-scanning of original documents and recording paper at variable speeds. That is, the transmission speed on the line is set to a constant speed by the pre-sending/receiving procedure performed by the main controller 3. 2 to the buffer memory of the main control unit 3 (it is better if the data import speed is faster than this speed (transmission speed on the line). However, if this import speed is too fast, the buffer memory will be filled with data. As a result, the compression unit 2 has to send this data onto the line and transfer the next data again until the buffer memory becomes free.Accompanyingly, the sub-scanning control unit 8 It is necessary to perform so-called step drive control in which the step motor is abruptly stopped to stop the sub-scanning of the document, and when the buffer memory becomes empty, the step motor is suddenly started again to restart the reading scan. Further, if the data transfer rate from the buffer memory to the expansion unit 6 during reception is faster than the data transfer rate on the line, normal reception can be performed, but this transfer rate is too fast and the buffer memory becomes empty. In this case, printing has to wait until the next data is input, and here too, the sub-scanning control section 8 is required to perform step drive control of the step motor in order to convey the recording sheet at variable speeds during transmission. It will be done.

[Problems with background technology]

As described above, in the conventional facsimile machine mentioned above, there was a restriction that the data input/output speed between the buffer memory in the main control section and the compression section and expansion section varied depending on the amount of data occupying the buffer memory. In order to perform sub-scanning of the original and recording paper corresponding to the input/output speed of the data, the sub-scanning control section is forced to drive the step motor by step control that involves abrupt stops and starts. At this time, there is a problem in that the image quality is significantly degraded due to reading errors and printing position deviations that increase due to the inertia of the step motor.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned actual situation, and the image quality is disturbed due to the step drive control button of the step motor corresponding to the data input/output speed which changes due to the limitation of the capacity of the buffer memory of the main control section. An object of the present invention is to provide a facsimile device that can prevent such problems.

[Summary of the invention]

Therefore, in the present invention, a data input/output speed control section is newly provided, and the data input/output speed between the buffer memory of the main control section, the compression section, and the expansion section is controlled according to the transmission speed on the line set by the old transmission/reception procedure. Through variable control, the step motor is driven by the sub-scanning control section at a constant and slow speed, and the above object is achieved by smoothly performing reading scanning of the document and printing scanning of the recording paper. .

do. FIG. 1 is a block diagram showing the configuration of a facsimile device according to the present invention, which includes a reading section 1 that reads a document, a compression section 2 that compresses and encodes binary data of the read document, and the entire device. A main control unit 3 that controls the compression-encoded data, a modem 4 that modulates the compression-encoded data into a signal compatible with the transmission method of the line, and demodulates the modulated signal into compression-encoded data, and a modem 4 that controls the line. an expansion unit 6 that restores the compression-encoded data to binary data; a printing unit 7 that prints the restored binary data; In addition to the same configuration as the conventional device, which includes a sub-scanning control section 8 that drives and controls a step motor for sub-scanning the paper, a data input/output speed control section 9 is newly provided. The transmission and reception operations in the facsimile apparatus of the present invention will be described in detail below with reference to FIG. First, when the main control unit 3 detects a transmission request command issued by the operator's operation, the main control unit 3 establishes the line while giving commands to the modem 4, line control unit 5, etc. according to the pre-transmission procedure. ,
Prepares for transmission by controlling settings such as transmission speed. Next, the main control section 3 sends a control signal corresponding to the transmission speed on the line determined by the pre-transmission procedure to the data input/output speed control section 9, and causes the data output speed control section 9 to: Settings are made such that data is taken in from the compression section 2 to the buffer memory in the main control section 3 at a speed corresponding to the transmission speed.

Thereafter, the data input speed set in this manner is maintained by the function of the data input/output speed control section 9 until the end of transmission.

After the series of pre-transmission procedures have been completed as described above, when the main control section 3 issues a reading start command to the reading section 1 and the sub-scanning control section 8, the -scanning control section 8 drives the step motor to The document is conveyed in the sub-scanning direction, and the reading section 1 reads the image information of the conveyed document as black and white binary data using a reading element such as an image sensor. The binary data of the scanned document is compressed and encoded by the compression section 2, and then taken into the buffer memory in the main control section 3 according to a command from the data input/output speed control section 9.

The compressed and encoded data taken into the buffer memory in this way is then transferred to the modem 4.
After being modulated into a signal compatible with the transmission method of the line, it is sent out onto the line through the line control section 5. During the transmission operation up to this point, the data input/output speed control unit 9 determines whether the compression unit 2 or the main control unit 3 Control is performed to maintain the speed at which compressed and encoded data is taken into the internal buffer memory at a speed that corresponds to the transmission speed on the line.

At the same time, the data input/output speed control section 9 also instructs the sub-scanning control section 8 to operate the step motor at a substantially constant, gentle speed so that the document is sub-scanned at a speed corresponding to the data capture speed. drive. This allows the reading section 1 to read the document smoothly, and stabilizes the reading accuracy.

On the other hand, the reception operation in the facsimile installation of the present invention is as follows:
The main control unit 3 starts when the main control unit 3 detects that a reception request has occurred, and after the detection, the main control unit 3 instructs the modem 4 and line control unit 5 according to the pre-reception procedure. Executes control such as establishing lines and determining transmission speed.

Next, the main control section 3 instructs the data input/output speed control section 9 to send a control signal corresponding to the transmission speed on the line determined by the above-mentioned pre-reception procedure. The control contents are set so that data transfer to the expansion section 6 is performed at a speed corresponding to the transmission speed. After completing such pre-reception procedures, the main control section 3 controls the line control section 5, modem 4, extension section 6, printing section 7, sub-scanning control section 8, and data input/output speed control section 9 as a whole. By controlling it, data transmitted over the line is received.

That is, the data received by the line control section 5 is decoded by the modem 4 from the above-mentioned modulated signal into compressed encoded data, and then input to the buffer memory in the main control section 3. Thereafter, under the control of the data input/output speed control section 9, the compressed and encoded data is transferred from the buffer memory to the expansion section 6 in accordance with the transmission speed on the line. After the original binary data chain is restored from the compressed encoded data by the extension unit 6,
Printing is performed on a recording sheet that is supplied to the printing section 7 and is being sub-scanned by a step motor driven by the sub-scanning control section 8 . Here, the step motor is driven by the sub-scanning control section 8 in such a manner that the recording paper is sub-scanned at a speed corresponding to the transmission speed on the line according to instructions from the data input/output speed control section 9. This will be done at an approximately constant, gentle speed. As a result, printing in the printing section 7 can be performed smoothly, and displacement of the printing position can be kept to a minimum. In this way, in the facsimile apparatus of the present invention, in response to a transmission/reception request, the data input/output speed control section 9, which receives a transmission speed instruction on the line from the main control section 3, controls the data in the buffer memory in the main control section. By controlling the input/output speed to be as slow as possible in a range faster than the transmission speed on the line, the step motor for sub-scanning the original and recording paper can be controlled to slowly move at a constant speed. It is intended to be driven. As an example of the data input/output speed in this case, if the transmission speed on the line is 9600 bps, the data input/output speed is 1
300 [bytes/sec], similarly 7200
The data input/output speed is variably controlled according to the transmission speed of each line, such as 1000 [bytes/sec] for bps.

〔Effect of the invention〕

As explained above, according to the facsimile apparatus of the present invention, data input/output connections between the buffer memory in the main control section, the compression section 2, and the expansion section are variably controlled according to the transmission speed of the line. , the power source such as a step motor is driven at an almost constant and gentle speed, and the document and recording paper are sub-scanned smoothly.As a result, image disturbances are reduced due to improved reading accuracy and print position accuracy. It has the excellent advantage of being able to obtain extremely good recorded images with minimal print quality.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the 7-axis 'J apparatus according to the present invention, and FIG. 2 is a block diagram showing the configuration of conventional facsimile coloring. DESCRIPTION OF SYMBOLS 1... Reading part, 2... Compression part, 3... Main control part, 4... Modem, 5... Line control part, 6... Extension part, 7... Printing part, 8... Sub-scanning control section, 9...
・Data input/output speed control section. Figure 1 21m

Claims (1)

[Claims] a reading section that reads image data of a manuscript; a compression section that compresses and encodes the read data; a main control section that controls each section; an expansion section that expands the compressed and encoded data; a recording section that records data on recording paper; a sub-scanning control section that drives a step motor for sub-scanning the document and the recording paper; The transfer rate and the transfer rate of data transferred from the buffer memory of the main control unit to the expansion unit are variably controlled according to the transmission speed on the line set by the main control unit before transmission/reception, and the transfer rate is a data input/output speed control section for giving a command to the sub-scanning control section so that the step motor is driven at a speed corresponding to the facsimile apparatus.