JPH05304583A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To improve the print quality by varying a delay time of a print timing in response to a motor exciting change time interval when a recording carrier motor enters intermittent operation so as to improve fluctuation of a picture recording position due to the effect of the motor excitation change time interval by a motor trigger. CONSTITUTION:A motor trigger signal is sent to a current driver 22 to switch an exciting phase of a motor 21 and stepping operation is implemented. Whether or not an intermittent flag is 0 is discriminated and when '0' is judged, the main scanning is proceeded. That is, when picture data are outputted continuously from a decoder 34, a strobe signal fed to a print head 32 and used, to print picture data is immediately outputted. However, it is judged that the intermittent flag is not 0, a scanning delay in response to a scanning delay register content is executed. That is, when the picture data are not continuously outputted from the decoder 34, the start of the main scanning is delayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus having improved image quality in image printing.

[0002]

2. Description of the Related Art Conventionally, in a facsimile machine which has a decoder and sequentially prints the decoded image data sent from the decoder to a recording / printing section, the recording / printing timing is opened and the motor is intermittently operated. There is a known facsimile apparatus that can delay the printing timing with respect to a change in the motor excitation when the following occurs.

[0003]

In such a facsimile machine, when the interval of the trigger signal to the motor is widened and the motor is intermittently operated, it takes time until the motor actually starts moving after receiving the motor trigger signal. The printing timing was changed in anticipation of this.
However, in the conventional facsimile apparatus, when the time interval of a certain motor trigger signal is opened, the delay time of the print timing with respect to the certain motor trigger signal is determined. However, as the actual movement of the motor, the time until the motor actually starts to move varies depending on the time interval of the motor trigger signal. Therefore, when a decoder has a decoder and the decoded image data is sent from the decoder to the recording / printing unit, the time interval of the motor trigger signal is changed by the decoder processing time in the facsimile machine that sequentially prints it. However, the conventional facsimile apparatus in which only one type of delay time is set is not sufficient as a countermeasure, and further improvement is required to improve print quality.

The object of the present invention is to solve the above-mentioned drawbacks, and to improve the fluctuation of the image recording position due to the influence of the motor excitation change time interval by the motor trigger and to improve the printing quality.

[0005]

In order to achieve the above object, the present invention is a facsimile apparatus for printing image data decoded by a decoder in a recording / printing unit, wherein the image data decoded by the decoder is It is not output continuously,
When the recording / printing timing in the recording / printing unit is opened and the recording paper conveyance motor is intermittently operated, when delaying the printing timing for the motor excitation change, the delay time of the printing timing is set according to the motor excitation change time interval. It changes.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a control block diagram of the entire facsimile apparatus. In FIG. 1, reference numeral 1 is an original reading section for converting a transmission original into read image data, and 2 is a received image.
A recording unit for printing a communication result report and the like. Reference numeral 3 is a network control unit or NCU for connecting a telephone line to a facsimile. Reference numeral 4 is a modulation / demodulation device, that is, a modem for performing communication. A modem control unit 5 controls the modulation / decoding device 4. 6 is an operation panel. 7 is a display for displaying the status of the facsimile to the user. Reference numeral 8 denotes a key provided on the operation panel 6 for the user to instruct the facsimile to perform various operations. Reference numeral 9 is a sensor for detecting the state of the facsimile, 10 is a memory, and 11 is an image memory for storing received image data and the like. 12 is a system RAM (or system memory) that is backed up by a battery or the like so that data is not destroyed even when commercial power is cut off due to a power outage, etc.
13 is a ROM that determines the specifications of the facsimile. 20
Is a central control unit that controls each unit.

FIG. 2 shows the original reading section 1 and the recording section 2 of FIG.
2 is a detailed control block of FIG.
Reference numeral 1 is a document transportation motor, and 12 is a current driver for supplying a current required to operate the document transportation motor 11. The document reading motor 1 and the current driver 12 constitute the document reading unit 1 shown in FIG.
Reference numeral 21 is a recording paper carrying motor, and 22 is a current driver for supplying a current necessary for operating the recording paper carrying motor 21. A cutter driving motor 23 drives a cutter for cutting the recording paper, and a current driver 24 supplies a current necessary for operating the cutter driving motor 23. These motors 2
1 and 23 and the current drivers 22 and 24, the recording unit 1 of FIG.
Is configured. 31 is a thermal head TPH for printing
It is a sub CPU for controlling the print head 32 such as the above and each motor 11, 21, 32. The sub CPU 31 incorporates a scan delay register and a scan delay counter. Reference numeral 33 is a smoothing IC that interpolates between the lines to be printed and improves the image quality. Reference numeral 34 is a code decoder, ie, CODEC, which decodes the coded signal such as the coded data sent by the partner transmitter and sends it as the raw image data to the smoothing IC 33. A main CPU 35 includes an address decoder which is a peripheral circuit and others. These sub CPU 31,
Print head 32, smoothing IC 33, code decoder 3
4. The central control unit 20 of FIG. The motors 11, 21 and 23 are stepping motors.

FIG. 3 is an explanatory diagram of strobe signals for the print head shown in FIG. In FIG. 3, P
RDY is a ready signal indicating that the code decoder 34 has data to be printed.
31 is transmitted. XPOE is a printout enable which is a response signal to the ready signal PRDY, and the code decoder 34 smooths the print data by the IC3.
3 is permitted. When the transfer of the print data to the smoothing IC 33 is completed, the ready signal PRDY is dropped, but it has the function of transmitting it to the encoder / decoder. The motor trigger is included in the control signal sent from the sub CPU 31 to the current driver 22, and the motor 21 switches the excitation state to perform the stepping operation by the motor trigger. A-phase and B-phase represent the A-phase and B-phase currents when the recording paper transportation motor 21 is driven by 1-2 phase excitation. The strobe signal is a pulse signal sent from the sub CPU 31 to the print head. The pulse signal causes the print head 32 to generate heat, and an image can be recorded on a recording paper such as a thermal paper that contacts the print head 32. In addition, the temperature of the thermal print head is kept constant.

Main scan (displayed as main)
Is a strobe signal for printing the image data sent to the print head 32. In the figure, sub-scan (displayed as "sub") is a fixed time which is the extra time when image data is not continuously sent to the print head 32, that is, when the image data transfer interval is increased. The strobe signal for printing the image data is continuously sent within the range. This makes it possible to increase the image print density.

The delay is an execution delay time until the main scan is started with respect to the motor trigger. The number written with = indicates the amount of delay time. For example, when 1 is written, it means that delay time = minimum unit of delay time × 1.
Here, as the motor delay time, a value corresponding to the value of the scan delay counter is transferred to the scan delay register to delay the scan timing of the value. The scan delay time, which is a value corresponding to the value of the scan delay counter, is determined by a table built in the sub CPU 31. A table in which the delay amount is 1 when the value of the scan delay counter is 2 to 4 and the delay amount is 2 when the value of the counter is 5 or more is used. In addition, the number of sub-scans is selected as a maximum of 4 triggers in FIG. In addition, when the delay is applied to the scan, the delay time is taken into consideration, and when selecting the delay time for the next motor trigger, the scan delay value selection processing is performed using the value obtained by adding the delay time to the scan delay counter. ..

In FIG. 3, a can flag is a sub CPU 3
1 is a flag used inside 1 and is a flag that is set when the image data from the encoder / decoder 34 for the sub CPU 31 is not continuous. Further, even when the image data is continuous, if the motor trigger is delayed by the scan delay counter (or scan delay register), the bucket flag is set in consideration of it.

In FIG. 3, a sub-scan trigger has a role of performing a sub-scan for a predetermined time with respect to one trigger, and is a trigger used inside the sub CPU 31. The scan delay counter is a counter that increments by 2 by a sub-scan trigger, and the scan delay register is a register that stores a delay value determined according to the value of the scan delay counter. In the device of the present invention, the timing of the main scan with respect to the motor trigger is delayed by the bucket flag shown in FIG. That is, the motor is intermittently operated when the trigger interval is opened, and there is a time delay from a change in the motor excitation signal caused by the motor trigger until the motor actually starts to move, compared with the case where the motor trigger is continuously received. This is taken into consideration in consideration of this.

The smoothing IC 33 creates interpolation data between the image data sent from the encoder / decoder 34 and transfers it to the print head 32.
Further, the print head 32 can perform an operation such as printing it, but in the present embodiment, the timing is shown without performing the interpolation function for the sake of simplification of the description.

Next, the operation of the above configuration will be described with reference to the flowchart of FIG.

First, in step S ₁ , a motor trigger is sent to the current driver 22 to switch the excitation phase of the motor 21 to perform a stepping operation. Then, step intermittently flag S ₂ is "0" whether it is determined, if it is judged to be 0, the process proceeds to step S _9, the main scan. That is, when the image data is continuously output from the decoder 34, the print head 3
Immediately output a strobe pulse signal for printing the image data sent to the device 2. However, step S
_If it is determined that the intermittent flag is not 0 in step 2, step S ₃
Then, the scan delay corresponding to the scan delay register value is executed. That is, when the image data is not continuously output from the decoder 34, the start of the main scan is delayed. This delay time is determined according to the scan delay register value n, and in the formula, it is determined by delay time = minimum unit of delay time × n.

Then, the scan delay register value is stored in the scan delay counter in step S ₄ . As a result, the count value of the scan delay counter is 2
If the count value is 2 or more, the intermittent flag is set to 1 in step S ₆ and the process proceeds to step S _{8. If} the count value is not 2 or more, in step S ₇ . The intermittent flag is set to 0 and the process proceeds to step S ₈ . In step S ₈ to set the scan delay register value corresponding to the scan delay count value.

After the execution of the scan delay, the main scan is started in step S ₉ . As a result, strobe pulses for printing the image data are output to the print head 32. Then, step S ₁₀
Then, it is determined whether there is next line data, and when it is determined that there is next line data, the process returns to step S ₁ again, and the same operation as described above is repeated, but it is determined that there is no next line data. In this case, the sub scan is started in step S ₁₁ . In this sub-scan, a strobe pulse signal is output for a certain period of time in order to increase the image print density when image data is not continuously output to the print head. The period of this sub-scan is determined by the number of sub-scan triggers. This output sub-scan trigger is counted by the scan delay counter in step S ₁₂ , and the counter is incremented by 2 for each trigger. In step S ₁₃ to set the scan delay register value corresponding to the scan delay count value. And whether or not the count value of the scan delay counter is two or more is determined in step S _14, when the count value is 2 or more, the process proceeds to step S ₁₇ is set to 1 the intermittent flag in step S _15, If the count value is not 2 or more, the intermittent flag is set to 0 in step S ₁₆ and the process proceeds to step S ₁₇ . In step S ₁₇ subscan is determined whether or not finished, if the sub-scan has not been completed and continues the sub-scan returns to step S _11. Further, the sub-scan has been completed in step S ₁₈ it is determined whether there is a next line data,
When it is determined that the next line data is present, the process returns to step S ₁ again and the same operation as described above is repeated. However, when it is determined that the next line is not present, it is determined in step S ₁₉ whether the printing is completed. , If printing is not completed, step S
_If the process returns to step ₁₈ and printing is completed, the operation ends.

The present invention is not limited to facsimile machines, but is also effective for printers in which the time interval of the motor trigger in printing changes greatly.

[0020]

As described above in detail, according to the present invention, in a facsimile apparatus in which image data decoded by a decoder is printed by a recording / printing unit, image data decoded by the decoder is continuously transmitted. When the recording / printing timing in the recording / printing unit is not opened and the recording paper transport motor is in the intermittent operation, the printing timing is delayed according to the motor excitation change time interval when the printing timing for the motor excitation change is delayed. By changing the delay time of, the fluctuation of the motor excitation change time interval due to the motor trigger improves the fluctuation of the image recording position and improves the image quality. Achieves accurate selection of the print timing delay time by considering the print timing delay time. A.

[Brief description of drawings]

FIG. 1 is a control block circuit diagram of an entire facsimile apparatus showing an embodiment of the present invention.

FIG. 2 is a detailed control block circuit diagram of a document reading unit and a recording unit shown in FIG.

FIG. 3 is a timing chart of the control block circuit shown in FIG.

4 is an operation flowchart of the control block circuit shown in FIG.

[Explanation of symbols]

 1 Document Reading Unit 2 Recording Unit 11 Document Transport Motor 20 Central Control Unit 21 Recording Paper Transport Motors 12, 22 Current Driver 31 Sub CPU 32 Print Head 33 Smoothing IC 34 Code Decoder 35 Main CPU 35

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display area // H04N 1/12 A 7205-5C

Claims (2)

[Claims] 1. A facsimile apparatus in which image data decoded by a decoder is printed by a recording / printing unit, image data decoded by the decoder is not continuously output,
When the recording / printing timing in the recording / printing unit is opened and the recording paper conveyance motor is intermittently operated, when delaying the printing timing for the motor excitation change, the delay time of the printing timing is set according to the motor excitation change time interval. Facsimile machine characterized by changing. 2. The facsimile apparatus according to claim 1, wherein the delay time of the print timing is added to the determination of the motor excitation change time interval necessary for selecting the delay time of the print timing.