JPH07107241A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To suppress mechanical vibration when scanner transmission is performed and to attain the improvement of picture quality and the prevention of a noise by setting document feed speed when image reading scan for scanner transmission is performed slower than that when the image reading scan for memory transmission is performed. CONSTITUTION:The image reading scan for memory transmission is performed by controlling a driver 23 based on a high-speed clock by a motor control circuit 24 by selecting a memory transmission mode in a state where a document G is set at an image reading part 2. Therefore, a reading sensor 1 performs the reading scan of an image document-fed at high speed. While, the reading scan for scanner transmission is performed by selecting a slow speed clock, and setting the rotation of a document feed motor M at slow speed. Therefore, document feed by only document quantity required for the reading scan of image data of just one line can be performed within the minimum scanning time of the image data of one line, which requires no stopping period of the motor M. In this way, the mechanical vibration can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus of a type in which a desired original is moved by driving a motor such as a step motor and the original image is read and scanned by a reading sensor such as a CCD sensor.

[0002]

2. Description of the Related Art Recently, in a facsimile apparatus, the scanning speed of reading an original image tends to be considerably increased. However, such a facsimile apparatus reads and scans an original image and transmits its image data to a communication partner. It has been proposed to have both a transmission function of a scanner transmission for transmitting to a scanner and a so-called memory transmission for temporarily storing a scanned and scanned original image in an image memory and then transmitting it to a desired communication partner. Therefore,
Conventionally, in any case, depending on the type of image reading scan for scanner transmission or memory transmission,
It has not been configured to positively change the drive current supplied to the document feeding motor accordingly. That is, conventionally, the drive current having the same frequency is used as the drive current supplied to the document feeding motor regardless of whether the image reading scan is for scanner transmission or memory transmission. It was the actual situation.

In the above-mentioned facsimile apparatus, when reading an image for memory transmission, it is sufficient to continuously read and scan an original image at a high speed, so that no particular trouble occurs. However, unlike this, the scanner transmission is performed. When this is executed, it may not be possible to continuously perform the reading and scanning of the original image because the communication processing of the image data requires more time than the reading and scanning of the original image. Regarding the procedure of facsimile communication, CCITT (International Telegraph and Telephone Consultative Committee) recommends the minimum scan line time when executing image data transmission (for example, in the normal mode, the minimum scan line time of one line of image data). As a result, it is necessary to execute image data transmission at a time interval suitable for this recommendation. Therefore, conventionally, when performing the image reading scan for the scanner transmission, for example, the motor is rotated at high speed as usual in the first half period of 10 mS defined by the CCITT recommendation to complete the reading scan of the image for one line. In the latter half of 10 mS, the motor is stopped and the reading scanning of the next line is waited.

FIG. 6 conceptually shows the waveform of the drive current of the motor when the above operation is executed. The rising and falling timings of the pulse shown in FIG. It is the time when the motor rotates by a predetermined step angle. Conventionally, document feeding and image reading scanning are performed by regularly rotating the motor in the section A in the same figure, but in the subsequent section B (from the beginning of the section A until 10 mS elapses), The motor was stopped, and it was in a standby state until the start of reading scanning of the next line.

[0005]

However, in the above-mentioned conventional apparatus, the period A in which the motor is driven and rotated at regular time intervals and the subsequent motor stop period B are repeated in an unbalanced time interval state. As a result, a large mechanical vibration is generated in the motor and the image reading device around the motor. As a result, conventionally, there have been problems in that an image obtained by reading and scanning at the time of scanner transmission is disturbed, the image quality is deteriorated, and noise is generated due to vibration.

The present invention has been proposed in view of the above points, and suppresses mechanical vibrations generated in the document feeding motor and its peripheral portion when executing the scanner transmission in the facsimile apparatus, and is obtained by reading and scanning. Its purpose is to improve the image quality of captured image data and prevent noise.

[0007]

A facsimile apparatus according to the present invention for achieving the above object is a facsimile apparatus having a motor for feeding an original when an original image is read and scanned by an image reading unit. Then, the drive rotation speed of the motor is set to be slower during image reading scanning for scanner transmission than during image reading scanning for memory transmission.
Means for changing the frequency of the drive current supplied to the motor is provided.

[0008]

In the facsimile apparatus according to the present invention having the above-mentioned structure, the motor for feeding the document is supplied when the image reading scan for the scanner transmission and the image reading scan for the memory transmission are performed. The frequencies of the drive currents to be generated are different, and the rotation speed of the motor becomes slower when the image reading scanning for scanner transmission is performed. Therefore, when the reading scan for the scanner transmission is executed, the document feeding speed can be reduced so that the reading scanning speed of the original image corresponds to the communication speed of the image data. That is,
At the time of scanner transmission, the rotation speed of the document feed motor is reduced and the scanning speed for reading the image data is slowed down so that the document feed motor can be operated within the time required to transmit the read and scanned image data. It can be rotated regularly. It is possible to eliminate the need to provide a period in which the motor is stopped for a long time and stands by until it is time to transmit the image data of the next line. As a result, it is possible to suppress the vibration of the motor during the scanning for scanning for the scanner transmission, and it is possible to eliminate the deterioration of the image quality and the generation of the noise caused by the vibration.

On the other hand, during reading scanning for memory transmission, the motor can be rotated at a higher speed than during image reading scanning for scanner transmission, and reading scanning of the document image can be performed at higher speed than during scanner transmission. Also, regarding motor driving at that time, unlike during scanner transmission, there is no restriction on the communication speed of image data, etc., and regular motor driving can be executed. Nor. Therefore, no trouble occurs in the reading scan for memory transmission.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a facsimile apparatus F according to the present invention.
2 is a block diagram showing an example of the hardware configuration of FIG. 2, and FIG. 2 is a block diagram showing an example of the motor drive control circuit shown in FIG.
The facsimile apparatus F has an image reading unit 2, a facsimile communication control unit 3, a hard codec 4 for executing image data encoding / decoding processing, and a scanner transmission execution for a signal processing unit 1 including a CPU and the like. A communication buffer memory 5 for temporarily storing image data in a computer, an image memory 6 for storing image data when executing memory transmission, a system memory 7 including a ROM and a RAM, and a key operation The unit 8, a display unit 9 including a liquid crystal display screen, and a print output unit 10 that prints out image data on recording paper are interconnected. Here, the facsimile communication control unit 3 uses the modem 3 for transmitting and receiving image data.
a, a tone signal generation circuit 3b, a tone signal detection circuit 3c, a line control unit 3d for controlling connection / disconnection of the line L, and the like.

The image reading section 2 is provided with a linear light source 20 for projecting light on the document G, a reading sensor 21 such as a CCD sensor, and a reading control circuit 22 for controlling the driving of the reading sensor 21. There is. Further, as a means for transferring the document G, a document feeding motor M composed of a step motor drivingly connected to a document feeding roller (not shown) or the like, and a driving current (driving pulse) to the document feeding motor M. ) Which supplies), and this driver 2
3 is also provided with a motor drive control circuit 24 for supplying a predetermined excitation phase.

The motor drive control circuit 24 has, for example, a circuit configuration as shown in FIG.
4a divides the internal clock as shown in FIG. 3A to create a plurality of types of clock signals having different pulse rates as shown by clock signals 1 and 2 in FIGS. 3B and 3C. . The selector 24b selects, for example, one of the above-mentioned clock signals 1 and 2 in accordance with the pulse rate setting command from the signal processing unit 1, and outputs this selected clock signal to the excitation phase generation circuit 24c side. It is a thing. The excitation phase generation circuit 24c generates an excitation phase having a pulse rate of the same frequency as the clock signal, based on the input clock signal. The excitation phase is generated so that two-phase excitation is performed when the reading scanning mode is normal and 1-2 phase excitation is performed when the reading scanning mode is fine, but in the present embodiment, such a distinction is made for convenience of explanation. The description will be omitted.

The signal processing unit 1 shown in FIG.
Although it has a function of controlling each part in order to execute desired facsimile communication according to the key operation, etc., it has the following control function for reading and scanning the original image. That is, the signal processing unit 1 shows, for example, in FIGS. 3B and 3C when the operation of starting the image reading of the document is performed in the state where the key operation unit 8 is designated to execute the memory transmission. Of the clock signals 1 and 2, the control command for selecting the side of the clock signal 1 having the higher frequency is sent to the selector 24b of the motor drive control circuit 24. On the other hand, when starting image reading of a document with scanner transmission selected, unlike the above,
It is configured to send a control command to select the side of the clock signal 2 having a frequency lower than that of the clock signal 1 of FIG. 3B.

Next, an example of use and operation of the facsimile apparatus F having the above-mentioned structure will be described. First, the case of performing image reading scanning for memory transmission will be described. In this case, with the document G set on the document table of the image reading unit 2, selection of the memory transmission mode, key input of the calling number, designated transmission time, etc., and start key operation may be performed. Then, in FIG. 3B and FIG. 3C, the clock signal 1 on the higher frequency side shown in FIG. 3B is selectively output from the selector 24b of the motor drive control circuit 24, and the excitation phase generation circuit of FIG. 24c is input. Then, the excitation phase is generated based on the clock signal 1, and the driver 23
Entered in.

In this case, the drive current supplied from the driver 23 to the document feeding motor M is the drive current 1 having a high frequency as shown in, for example, FIG. 4A (note that FIG. 4A). 6B conceptually shows the waveform of the drive current as in FIG. 6, in which the excitation phase changes at the rising and falling timings of the pulse, and the motor rotates by a predetermined step angle). Therefore, the motor M is rotated by a predetermined step angle at a constant time interval t1 by the drive current 1, and the document G is fed at high speed.
The image reading / scanning for memory transmission is not restricted in time for executing the communication process, so that the reading sensor 21 can read and scan the image fed at high speed line by line at high speed. Becomes With such regular rotation of the motor M, it is difficult for the motor M to vibrate with large amplitude, and image scanning with good image quality can be performed. The image data obtained by the reading and scanning is stored in the image memory 6, and the facsimile device F is in the standby state for the memory transmission. After that, when the designated time is reached, the facsimile transmission of the image data is started.

Next, unlike the above case, a case of performing image reading scanning for scanner transmission will be described. In this image reading scan for scanner transmission, after the original G is set, a calling operation such as a calling number input or a start key operation is performed, and if a facsimile is received by the other party, a predetermined protocol signal is mutually transmitted. It will start after a while. In this image reading scan, the clock signal 2 having the lower frequency shown in FIG. 3C is selected from the clock signals 1 and 2 shown in FIGS. 3B and 3C, and this is the excitation phase generation circuit 2.
4c, an excitation phase based on the clock signal 2 is generated and input to the driver 23. In this case, the drive current supplied from the driver 23 to the document feeding motor M is, for example, as shown in FIG. 4B, the drive current 2 having a lower frequency than the drive current 1 shown in FIG. Becomes Therefore, the motor M is rotated by a predetermined step angle at constant time intervals t2 by the supply of the drive current 2, and the document G is fed at a speed lower than that at the time of reading an image for memory transmission.

On the other hand, in this type of image scanning for scanner transmission, the minimum scanning line time T of one line of image data is normally set in accordance with the communication processing speed of image data or the CCITT recommendation. At least 10m in mode
There is a request that must be S or above. However, if the rotation speed of the motor M is reduced as described above, this
In the time of 0 mS, it becomes possible to feed the document by the amount of the document required for reading and scanning the image data of just one line.
It is not necessary to provide a long stop period of the motor M corresponding to the section B of FIG. 6 shown in the conventional example. In FIG. 4B in the present embodiment, the motor M is regularly rotating at a constant time interval t2. Therefore, in the image reading / scanning by the regular rotation of the motor M, the mechanical vibration having a large amplitude is suppressed, and as a result, the image reading / scanning with good image quality can be performed, and this can be appropriately transmitted to the desired other party. it can.

From step 100 of the flowchart of FIG.
Reference numeral 112 denotes a series of operation procedures in the case of performing the two types of image reading scanning for the above-mentioned scanner transmission and memory transmission. In addition to the above, the reading scan of the original image may be, for example, a reading scan for copying the original image. In such a reading scan, the motor M is rotated at a high speed similarly to the reading scan for transmitting the memory. Therefore, it is desirable to increase the reading scanning speed. Therefore, in the present invention,
In practice, it is preferable that the normal setting of the motor M is set to high speed rotation, and the low speed rotation is performed only when the scanner transmission is executed.

[0019]

As can be understood from the above description, according to the facsimile apparatus of the present invention, the document feeding speed is set high during the image reading scanning for memory transmission, and the reading scanning of the document image can be performed at high speed as before. Of course, at the time of scanning and scanning the image for scanner transmission, the document feeding speed is set to be low so that the document feeding motor is regularly rotated within a predetermined time required for image data communication processing. As a result, it is possible to appropriately avoid the conventional motor rotation being repeated at unbalanced intervals, and to suppress mechanical vibration of the motor. As a result, it is possible to prevent the disturbance of the image due to the vibration of the motor, improve the image quality, and prevent noise.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a hardware configuration of a facsimile apparatus according to the present invention.

2 is a block diagram showing an example of a hardware configuration of a motor drive control circuit provided in the facsimile apparatus shown in FIG.

FIG. 3 is a time chart showing an example of an internal clock and a clock signal generated based on the internal clock and having different pulse rates.

FIG. 4 is a time chart conceptually showing a waveform of a drive current supplied to a document feeding motor.

5 is a flowchart showing an example of an operation procedure of image reading and scanning executed by the facsimile apparatus shown in FIG.

FIG. 6 is a time chart conceptually showing a waveform of a drive current supplied to a motor for feeding an original when executing image scanning for scanner transmission in the related art.

[Explanation of symbols]

 1 signal processing unit 2 image reading unit 3 facsimile communication control unit 4 hard codec 5 communication buffer memory 6 image memory 7 system memory 8 key operation unit 21 reading sensor 22 reading control circuit 23 driver 24 motor drive control circuit 24a frequency dividing counter 24b selector 24c Excitation phase generating circuit M Motor for feeding originals G Original L Line F Facsimile device

Claims (1)

[Claims] 1. A facsimile apparatus having a motor for feeding an original when an original image is read and scanned by an image reading means, wherein a driving rotation speed of the motor is higher than that during image scanning for memory transmission. A facsimile machine comprising means for changing the frequency of a drive current supplied to the motor so that the scanning speed for scanning an image for scanner transmission becomes slower.