JPH0584978A - Recorder - Google Patents

Abstract

PURPOSE:To prevent the occurrence of printing irregularities by smoothly setting the rotating speed of a recording paper feed motor. CONSTITUTION:A recorder comprises a printing data detection means detecting the presence or absence of printing data for a next line; a speed conversion flag setting means raising a speed conversion flag when the output of the printing data detection means indicates the absence of printing data ; and a low speed setting means setting a low rotating speed of a recording paper feed motor and a large strobe width of a printing head under the condition of either the raising of said speed conversion flag or the unforming of printing data for a next line during a continuous printing action. The recorder also comprises a normal printing speed setting means setting a normal rotating speed of the recording paper feed motor and a normal strobe width of the printing head under the condition of neither the raising of said speed conversion flag nor the unforming of printing data for a next line during a continuous printing action.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device used for a printer or the like of a facsimile machine.

[0002]

2. Description of the Related Art Conventionally, when a facsimile apparatus receives data in which a simple image and a complex image are mixed, a simple image portion does not require time for decoding and print data can be created. The recording paper feed motor can be rotated at a constant speed because it is performed one after another.However, since it takes time to decode the complicated image part and the print data creation is delayed, the rotation of the recording paper feed motor can be prevented. I had to stop it and wait for the print data to be created.

[0003]

When such a complicated image is received, the recording paper feed motor is rotated or stopped, so that uneven printing is likely to occur. Therefore, it was difficult to obtain a good quality hard copy.

[0004]

A print data detecting means for detecting the presence or absence of print data on the next line, and a speed conversion flag setting means for setting a speed conversion flag when the output of the print data detecting means is no print data. , Set the recording paper feed motor to a slower rotation speed and increase the strobe width of the print head under the condition that the speed conversion flag is set or the print data of the next line is not created during the continuous printing operation. The slow speed setting means to be set, and the recording paper feed motor is set to a normal rotation speed and printing is performed on condition that the speed conversion flag is not set during the printing operation and the print data of the next line is created. The recording device is formed by the normal print speed setting means for setting the strobe width of the head to the normal state.

[0005]

In the printing operation detected by the print data detection means, if the print data of the next line is created one after another, the normal rotation speed of the recording paper feed motor and the print head are set by the normal print speed setting means. When the normal recording paper is fed with the normal strobe width and the output of the print data detection means has no print data, the speed conversion flag is set by the speed conversion flag setting means, and the speed conversion flag is set during the printing operation. Is set or the print data of the next line is not created, the recording paper feed motor is set to a slow rotation speed and the strobe width of the print head is set to a large value. Slow down, this
The time to create the print data of the next line is secured so that the recording paper feed motor does not suddenly start or stop during the printing operation to prevent uneven printing. ..

[0006]

An embodiment of the present invention will be described with reference to the drawings. The present embodiment relates to a facsimile machine, and a central processing unit 1 (hereinafter referred to as CPU) is connected to a facsimile (FAX) modem 2 connected to an external telephone line. A ROM 3 in which processing programs and the like are stored and a RAM 4 acting as a temporary storage means are connected to the CPU 1.

Therefore, the CPU 1 operates the liquid crystal display 5 (LCD) as a display unit, the image compression unit 6, the image reading unit 7, the image restoration unit 8 and the image printing unit 9 having the recording paper feed motor. Keyboard 10 as part
And are respectively connected via a bus line 11.

The operation at the time of reception in such a configuration will be described with reference to FIGS. 2 and 3. First, a program for controlling the rotation speed of the recording paper feed motor will be described with reference to FIG. This embodiment is premised on printing line by line, and the print data detecting means checks whether or not there is print data for the line to be printed. If there is no print data, wait until the print data is created. At this time, the speed conversion flag setting means sets a slow speed flag as a speed conversion flag.

Then, when the print data is created, since the slow speed flag is set, the slow speed setting means operates to set the recording paper feed motor in a state in which it is driven at a low rotational speed, and the strobe of the print head is set. Set width for slower motor speeds. Then, in this state, the transfer of the print data to the print head, in the case of this embodiment, the thermal head is started. The slow speed flag is then reset. Therefore, the slow speed flag is not set for the next line, and it is checked whether or not there is print data for the next line. Here, the processing differs depending on whether there is print data for the next line or not.

If the density of print data is high and the print data for the next line cannot be created in time, the recording paper feed is performed on condition that there is no next line data, as in the case where the slow speed flag is set. Set the motor to drive at a slower rotational speed and set the printhead strobe width for a slower motor speed. As a result, the same operation is continued until the print data of the next line is created.

When there is print data for the line to be printed and the slow speed flag is not set and there is print data for the next line, the normal print speed setting means causes the recording paper feed motor to move. Is set to a normal motor speed, and the strobe width of the print head is also set to a normal state. As a result, preset constant speed printing is performed.

Next, FIG. 3 is a timing chart of the fine mode in which one line is printed by the recording paper feed motor shift. The speed of rotating the normal recording paper feed motor is 4.85 msec per shift, and the speed of rotating the recording paper feed motor in the case of slowing down, that is, slowing down / slowing up is 7.50 per shift.
msec, the waiting period when there is no data to print is 1
The time required for data transfer of the thermal head is 0.00 msec and 0.80 msec.

First, a, b, c, d, e, f, g, h,
Set j, k, m, and n points. Here, points a and b are in a state where there is data of a line to be printed, the slow speed flag is reset, and there is data next to the line to be printed. In this case, the rotation speed of the normal recording paper feed motor and the strobe width of the normal thermal head are set to start the transfer of print data to the thermal head.

At point c, there is data for the line to be printed and the slow speed flag is reset, but there is no data for the next line to be printed. In this case, the rotation speed of the recording paper feed motor slower than usual is set, the strobe width of the thermal head for the slow rotation speed of the recording paper feed motor is set, and the transfer of print data to the thermal head is started.

The points d, e, f, g, and h are in the state where there is no data for the line to be printed. in this case,
Set the slow speed flag and enter the standby state.

Point j is a state in which there is data for the line to be printed, but the slow speed flag is set. In this case, set the rotation speed of the recording paper feed motor slower than usual, set the strobe width of the thermal head for the slow rotation speed of the recording paper feed motor, and start the transfer of print data to the thermal head. At this time, the slow speed flag is reset.

The points k, m and n are the same as the points a and b.

In addition, a, b, c, d, e, f, g, h,
Interrupts of timers other than j, k, m, and n are interrupts for shifting the recording paper feed motor.

The present embodiment as described above will be summarized as follows. When printing one line at a time in a facsimile machine, there is no print data for the line to be printed, and it may be necessary to stop the recording paper feed motor. In this case, the recording paper feed motor is suddenly stopped. To prevent this, at the start of printing, it is judged whether or not there is print data on the line next to the line to be printed, and if there is no print data, the speed of rotating the recording paper feed motor is slowed down before printing. To do so. As a result, it is possible to prevent the recording paper feed motor from being suddenly stopped even if there is no print data when printing the next line. Also, if there is no data to be printed and print data is created when the recording paper feed motor is stopped and waiting, even if data for the line next to the line to be printed is created, Also, rotate the recording paper feed motor at a slow speed so that the rotation speed of the recording paper feed motor does not rise suddenly. As a result, the unevenness of printing is prevented by making the rotation speed of the recording paper feed motor change more smoothly than before.

[0020]

As described above, the present invention provides print data detecting means for detecting the presence / absence of print data for the next line, and speed conversion for setting a speed conversion flag when the output of this print data detecting means is no print data. With the flag setting means, the recording paper feed motor is set to a low rotation speed and the print head feed motor is set to a low rotation speed under the condition that the speed conversion flag is set or the print data of the next line is not created during the continuous printing operation. The slow speed setting means for setting the strobe width large and the recording paper feed motor to the normal rotation speed on condition that the speed conversion flag is not set during the printing operation and the print data of the next line is created. Since the recording device is formed by the normal print speed setting means that sets the strobe width of the print head to the normal state while setting the print head, If the print data of the next line is created one after another during the printing operation detected by the printer detection means, the normal print speed setting means sets the normal rotation speed of the recording paper feed motor and the normal strobe of the print head. The width and are set and normal chart paper feed is performed,
When the output of the print data detection means has no print data, the speed conversion flag is set by the speed conversion flag setting means, and either the speed conversion flag is set during the printing operation or the print data of the next line is not created. Under these conditions, the recording paper feed motor is set to a slow rotation speed and the printing speed is slowed by the slow speed setting means for setting the strobe width of the print head to a large value.
The effect that it is possible to prevent the occurrence of print unevenness by taking time to create print data for the next line and preventing the recording paper feed motor from suddenly starting or stopping during printing operation Have.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart of a program for controlling the rotation speed of a recording paper feed motor.

FIG. 3 is a timing chart of a printing operation.

Claims (1)

[Claims] 1. A print data detecting means for detecting the presence or absence of print data on the next line, a speed conversion flag setting means for setting a speed conversion flag when the output of this print data detecting means is no print data, and a continuous printing operation. A slow speed that sets the recording paper feed motor to a slow rotation speed and sets the strobe width of the print head to a large value under the condition that the speed conversion flag is set inside or the print data of the next line is not created. The setting means and the recording paper feed motor are set to the normal rotation speed and the strobe width of the print head is set on condition that the speed conversion flag is not set during the continuous printing operation and the print data of the next line is created. And a normal printing speed setting means for setting the printing state to a normal state.