JPH08127141A - Printing method of serial printer - Google Patents

Abstract

PURPOSE: To provide a printing method enabling recording of high printing quality inconspicuous in interlinear space by reducing the damage of the overlap printing part of recording paper and eliminating the irregularity of the surface gloss of the recording paper in a case performing recording while allowing before and behind lines to overlap with each other in a serial printer. CONSTITUTION: After recording scanning is performed, the overlap printing part with a next line is re-scanned by low energy to restore the damage of recording paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a serial printer for recording a desired image or character on a recording sheet by repeating a series of operations of scanning a recording head in the main scanning direction and then feeding a line in the sub scanning direction. It is about.

[0002]

2. Description of the Related Art In recent years, serial printers have come into widespread use as personal printers and word processor printers because of their relatively simple structure, small size, and low price. As the recording head, there are a dot impact head, a thermal head, an inkjet head, and the like, and they are used in a form in which the characteristics of each head can be utilized.

FIG. 8 is a block diagram of a serial printer using a thermal head as a recording head. 1
Is a thermal head, and as shown in FIG. 9, n heating elements 1A which are recording elements are formed in rows. Reference numeral 2 is an ink ribbon cartridge, and a ribbon in which a sublimation dye is applied as ink to the ink ribbon 2A is used to realize gradation recording. Reference numeral 6 denotes a recording paper, which is formed by forming a dyeing layer 6A for receiving a sublimable dye on a base film 6B as shown in FIG.
Further, 3 is a carriage, 4 is a guide, and 5 is a platen.

The printing operation will be described below with reference to FIG. First, the carriage 3 holding the thermal head 1 and the ink ribbon cartridge 2 is moved in the direction of arrow x along the guide 4 to perform scanning in the main scanning direction. At this time, a recording signal corresponding to a desired recording image is applied to the thermal head 1 to heat the ink ribbon 2A in accordance with the recording signal, so that the recording paper 6 has one line corresponding to the length h of the heating element 1A column. Print minutes.

Next, the platen 5 is rotated to drive the recording paper 6
To feed a line for one line in the sub-scanning direction, return the carriage 3 to the original position, and scan the next line. As described above, printing for one page of the recording paper 6 can be performed by repeating scanning in the main scanning direction and line feed in the sub scanning direction.

However, when printing is performed by the above-described printing operation, the recording paper 6 is expanded or contracted, the platen 5 is deformed, and the like, causing unevenness in the feeding amount of the recording paper 6, resulting in gaps or overlaps in the seams between lines. However, it may appear as a white streak or a black streak in a recorded image, which may cause deterioration of print quality. Therefore, as shown in FIG. 10A, a method is used in which the print density at the end of the line is gradually reduced and printing is performed while overlapping the preceding and following lines by a predetermined width. FIG. 10A shows an example in which the overlapping print width is set to d1 and printing is performed. However, the feeding amount of the recording paper 6 becomes uneven, and the overlapping print width changes like d2 or d3. However, as shown in FIG. 10 (b), there is only a moderate density variation between lines, and there is no sharp density variation such as white or black streaks, which makes the line spacing less noticeable and lowers the print quality. It can be improved (for example, JP-A-62-5771).

[0007]

However, in the above-mentioned structure, a relatively high thermal energy is required to transfer the sublimable dye applied to the ink ribbon 2A to the recording paper 6 for recording, and At the time of recording, the dyeing layer 6A on the surface of the recording paper 6 is softened by the heat applied by the thermal head 1 and fused to the ink ribbon 2A, and the dyeing layer 6A is stretched when the ink ribbon 2A is peeled off. It will be transformed. Further, the overlapping print portion needs to be scanned twice in the case of monochromatic recording, and in order to obtain a desired print density by the two scans, one scan is performed due to the characteristics of the sublimable dye applied to the ink ribbon 2A. As a result, a large amount of heat energy is required as compared with the amount of heat energy required to obtain the desired print density. Deformation becomes severe. That is, as shown in FIG. 11, the surface roughness (damage) of the recording paper 6 in the overlap-printed portion becomes larger than that in the non-overprinted portion, and the surface between the overlap-printed portion and the non-overlap-printed portion is increased. There is a problem in that a difference in gloss is caused to make the overlapped printing portions more conspicuous and the printing quality is deteriorated. Especially for color recording, YM
If the recording is performed with the three colors of C, the overlapping print portion is scanned 6 times in total, and the uneven glossiness due to the damage of the recording paper 6 appears remarkably.

In view of the above problems, the present invention reduces damage to the overlapped printing portion of the recording paper and makes gloss unevenness on the surface of the recording paper inconspicuous when the serial printer is used for recording while overlapping the preceding and following lines. To provide a printing method of a serial printer capable of high-quality printing recording.

[0009]

In order to solve the above problems, in the printing method of the serial printer of the present invention, the line feed width in the sub-scanning direction is made shorter than the scanning width in the main scanning direction so that the scanning in the main scanning direction is performed. Overlapping recording is performed so that a predetermined number of print dots overlap with the preceding and following scanning, and the overlapping portion is scanned again while driving the recording elements with a predetermined recording energy.

The recording energy applied to the recording element at the time of rescanning is controlled according to the print data when the overlapping portion is recorded. Further, the recording energy is applied to the recording element at the time of rescanning only at a portion where the print data when the overlapping portion is recorded is equal to or more than a predetermined value.

After the first line is recorded, a line feed is performed, the second line is overlap-recorded with the first line, and the second line is further recorded.
In this row, only the recording element corresponding to the portion overlapping with the first row is driven to scan the second row again.

Further, the first line is color-recorded by scanning a large number of times, and then a line feed is performed, and the second line is overlap-recorded with the first line by a large number of scanning similarly to the first line. In the second row, only the recording element corresponding to the portion overlapping the first row is driven to scan the second row again.

Further, the first row is recorded, and only the recording element corresponding to the portion of the first row that overlaps the second row is driven to scan the first row again, and then a line feed is performed. Is to be overlap-recorded with the first line.

Further, in the serial printer for performing desired image recording by transferring the ink of the ink sheet to the recording sheet with the ink sheet interposed between the recording head and the recording sheet, it is possible to scan the first or second row. The used ink sheet is used again when rescanning the same row.

Further, the recording energy applied to the recording element during the rescanning of the first or second row is such that the ink of the ink sheet does not transfer to the recording paper.
Also, in a serial printer that performs desired image recording by transferring ink of the ink sheet to the recording sheet with an ink sheet interposed between the recording head and the recording sheet,
The ink sheet has an uncoated portion of the ink which is not coated with ink, and the uncoated portion of the ink sheet is used when rescanning the first or second row. Further, the scanning speed during recording and the scanning speed during rescanning are made different.

[0016]

According to the present invention, with the above-described structure, the overlapping printing portion of the recording paper is rescanned by setting the recording energy applied to the recording element to be lower than the recording energy at the time of normal recording scanning, and re-scanning the overlapping printing portion. Is softened at low temperature and smoothed by the pressing force of the thermal head,
The ink ribbon can be peeled off without being fused and the damage can be recovered, and a uniform high-quality recorded image with no uneven glossiness can be obtained on the surface of the recording paper.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A printing method of a serial printer according to a first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a circuit configuration for realizing a printing method of a serial printer according to the first embodiment of the present invention. In FIG. 1, 1 is a thermal head which is a recording head, 10 is a CPU for executing a printing sequence of the printer, 11 is a carriage motor 12
A motor drive circuit for driving the paper feed motor 13 and a print control circuit 14 for controlling the drive timing of the thermal head 1. Reference numerals 15 and 16 are row buffers that receive gradation print data corresponding to one row from a host such as a computer (not shown), and have a toggle structure in which one is in a read state and the other is in a write state. The state is changed every time a line is printed. The gradation print data is composed of, for example, 8 bits / print dot, and 256 gradations can be expressed per print dot. Reference numeral 17 is a heating element 1A which is a recording element.
Latch circuit for temporarily holding the gradation print data for driving the line, 18 is a memory for holding one line of the gradation print data of m dots at the lower end of the previous line, and 19 is a mask for adjusting the print density Circuit. The structures of the mechanical portion of the serial printer and the thermal head 1 are the same as those of the conventional one, and are as shown in FIGS. 8 and 9, respectively.

The printing method of the serial printer using the circuit configured as described above will be described below with reference to FIGS. 1, 2 and 3.
And it demonstrates along the flowchart of FIG. 2 using FIG. In FIG. 1, the CPU 10 is a motor drive circuit 11
By driving the carriage motor 12, the carriage 3 in FIG. 8 is moved in the direction of arrow x to scan the first row in the main scanning direction. When scanning in the main scanning direction is started, each time the carriage 3 is moved by one print dot in the main scanning direction, recording for forming print dots of desired print density on each heating element 1A of the thermal head 1 is performed. Energy is applied, and one line is printed on the recording paper 6 with the width h of the heating element 1A column. The recording energy is controlled by changing the voltage or pulse width applied to each heating element 1A according to the gradation print data, and the processing of the gradation print data is performed as follows.

First, the gradation print data held in the row buffer 15 or 16 is read by n−m dots and held in the latch circuit 17. Also, the gradation print data for m dots at the lower end at the same main scanning position in the preceding line is stored in the memory 18
Hold (blank if the scan line is the first line). From the gradation print data output from the latch circuit 17 and the memory 18, it is possible to obtain the gradation print data for n dots necessary for printing the present line. Subsequently, the gradation printing data for n dots is processed in the mask circuit 19. That is, the gradation print data for m dots at each of the upper end and the lower end of the heating element 1A row of the thermal head 1 is replaced with the gradation print data of a lower gradation. The n-2m dots in the central portion of the heating element 1A row are the original gradation print data and are not replaced. Therefore, the heating element 1 of the thermal head 1
Printing energy is applied to A in accordance with the gradation print data in which the upper and lower end portions of the heating element 1A row are replaced so that m dots are low gradation. After the recording energy is applied to the heating element 1A, the latch circuit 17
Among the gradation print data for nm dots held in the memory 18, the gradation print data for m dots at the lower end of the heating element 1A row is stored in the memory 18 and is used when printing the next line. It As a result, as shown in FIG. 10, the processing of the overlapping print portion is performed so that the density becomes lower toward the end.

The dyeing layer 6A on the surface of the recording paper 6 before scanning
3A is smooth as shown in FIG. 3A, it is softened by the heat applied by the thermal head 1 after the scanning of the first line and fusion occurs between the ink ribbon 2A and the ink ribbon 2A, and Since it is deformed at the time of peeling, as shown in FIG. 3B, irregularities are formed and the dyeing layer 6A is damaged.

When the printing of the first line is completed, the CPU 10 causes the motor drive circuit 11 to rotate the carriage motor 12 in the reverse direction to return the carriage 3 to the original position, and at the same time, drives the paper feed motor 13 to move the platen 5 in FIG. By feeding the recording paper 6 while rotating it in the direction, a line feed is made in the sub-scanning direction. The line feed amount at this time is shorter than the print width h for one line, and has a width corresponding to nm dots. Therefore 2
At the time of scanning the line, m dots of the preceding line are printed in duplicate.

The printing scan of the second line is performed in the same manner as the first line, and printing is performed so as to have a portion overlapping with the first and third lines. At this time, the state of the dyeing layer 6A on the surface of the recording paper 6 at the position corresponding to the overlapped printing portion between the first line and the second line is further deformed by being heated again by the scanning of the second line. The damage increases as shown in FIG. Note that the carriage 3 is not returned immediately after the scanning of the second line, the carriage 3 is returned to the original position, and the ink ribbon 2A is rewound by a length corresponding to one line recording in order to save the ink ribbon 2A. Transition to rescanning of the row.

At the time of rescanning of the second line, the print control circuit 14
Issues an instruction to change the processing in the mask circuit 19. That is, the gradation print data corresponding to the m dots in the portion that overlaps with the preceding row is written over one row, for example, with the maximum recording energy of 1
Uniformly replaced with data corresponding to about 0% (the degree to which the sublimable dye applied to the ink ribbon 2A does not transfer),
The gradation print data of the other portion is set to 0 (non-printing), and the second row is rescanned while driving the heating element 1A of the portion overlapping the preceding row of the thermal head 1 with low energy. The moving speed of the carriage at the time of rescanning does not have to be the same as the moving speed at the time of recording scanning, and the moving speed may be set high in consideration of driving the thermal head 1 with low energy. As a result, the second line is scanned while applying a weak heat only to the overlapping print portion with the preceding line, so that the dyeing layer 6A on the surface of the recording paper 6 in the overlapping print portion does not fuse with the ink ribbon 2A. Since the ink ribbon 2A is peeled off while being softened and smoothed by the thermal head 1, the damage can be recovered as shown in FIG. 3D. Then, after the rescanning is completed, the second line is broken.

Thereafter, similar to the process of the second line, printing by recording scan, rewinding of the ink sheet 2A, damage recovery of the overlapped printing portion with the previous line by rescanning, line feed is repeated for one page on the recording paper 6. Make a record.

As described above, according to the present embodiment, the recording energy applied to the recording element is set to be lower than the recording energy at the time of the normal recording scan, and the overlapped printing portion is rescanned, so that the recording paper of the recording sheet is rescanned. The overlapping print portion is softened at a low temperature and smoothed by the pressing force of the thermal head, peeled off without being fused to the ink ribbon to recover the damage, and a uniform height with no unevenness of gloss on the surface of the recording paper 6 is conspicuous. It is possible to obtain a quality recorded image.

A second embodiment of the present invention will be described below with reference to the drawings. The configuration of the serial printer mechanism unit for realizing the printing method of the serial printer of this embodiment is the same as that of FIG. 8, and the configuration of the circuit unit is also the same as that of FIG. 1 shown in the first embodiment. The difference from the device configuration of the first embodiment is that Y (yellow) and M provided as the ink ribbon 2A of the ink ribbon cartridge 2 are provided with a length corresponding to one line printing as shown in FIG.
The point is that color recording is performed using a ribbon having a pattern of (magenta) and C (cyan).

FIG. 4 is a flow chart showing the printing method of the serial printer in the second embodiment of the present invention.
The printing method of the serial printer will be described below with reference to FIG. First, the ink ribbon 2A of the ink cartridge 2 is wound up to perform the heading of the Y pattern, and then the main scanning direction 1
The Y pattern is printed by the first scan of the row. After that, the carriage 3 is returned to the original position, the M pattern is printed by the second scanning of the same row, and subsequently the C pattern is printed by the third scanning in the same manner. By printing the above three times, the printing of the first line is completed and a line feed is performed. However, the line feed amount is made smaller than the width h of one line as in the first embodiment so that a portion overlapping the second line is provided. The processing of the gradation print data of the overlapping portion is similar to that of the first embodiment, and the three YMC colors are processed by the mask circuit 19 so that the density becomes lower toward the ends. The gradation print data replaced by this process is determined by the overlapping print characteristics of the sublimable dyes of each YMC, and may differ for each of the three colors.

Next, similarly to the first row, the second row is scanned three times in the YMC order to record the second row. In the recording of the second line, the mask circuit 19 processes the portions overlapping the first and third lines so that the density becomes lower toward the end. Note that the carriage 3 is not returned immediately after the scanning of the second line, the carriage 3 is returned to the original position, and further, in order to save the ink ribbon 2A, C of the ink ribbon 2A is rewound by a length corresponding to one line recording, Transition to rescanning for the second row.

During rescanning of the second row, the mask circuit 19 performs the same processing as in the first embodiment, thereby driving the heating element 1A in the portion overlapping the preceding row of the thermal head 1 with low energy. Therefore, since the second row is scanned while applying a weak heat only to the overlapping portion with the preceding row, the dyeing layer 6A on the surface of the recording paper 6 in the overlapping portion recovers damage as in the first embodiment. be able to. Then, after the rescanning is completed, the second line is broken.

Thereafter, similar to the process of the second line, YMC three-color recording by recording scan, rewinding of the ink sheet 2A, damage recovery of the overlapping portion with the previous line by rescanning, line feed is repeated and one page is recorded on the recording paper 6. Make minute color recordings.

As described above, according to this embodiment, YMC3
Even when color recording is performed using the ink ribbon 2A having a color pattern, the recording paper 6 is re-scanned at low energy after performing three-color recording by performing recording scanning three times and then reprinting the overlapped printing portion with the preceding line. It is possible to recover the damage of 1. and obtain a uniform high-quality recorded image on the surface of the recording paper 6 with no uneven gloss.

A third embodiment of the present invention will be described below with reference to the drawings. The configuration of the serial printer mechanism unit for realizing the printing method of the serial printer of this embodiment is the same as that of FIG. 8, and the configuration of the circuit unit is also the same as that of FIG. 1 shown in the first embodiment. As the ink ribbon 2A, a monochromatic ribbon is used as in the first embodiment.

FIG. 7 is a flow chart showing the printing method of the serial printer according to the third embodiment of the present invention.
The printing method of the serial printer will be described below with reference to FIG. First, one line is printed by scanning the first line in the main scanning direction. At this time, the processing of the gradation print data of the portion overlapping with the second row is processed by the mask circuit 19 so that the density becomes lower toward the ends, as in the first embodiment. The difference from the first embodiment is that a line feed is not made immediately after the scanning of the first line,
This is the point where the first line is rescanned. Therefore, the carriage 3 is returned to the original position, and in order to save the ink ribbon 2A, the ink ribbon 2A is rewound by the length corresponding to one line recording, and then the rescanning of the first line is performed.

At the time of rescanning the first line, the same processing as in the first embodiment is carried out by the mask circuit 19, but unlike the first embodiment, the overlapping printing with the next line is performed instead of the overlapping printing with the preceding line. Energy control of the part. That is, the thermal head 1
The portion of the heating element 1A that overlaps with the next row is driven with low energy in advance. As a result, since the first line is scanned while applying a weak heat only to the overlapping print portion with the next line, the dyeing layer 6A at the position corresponding to the overlapping print portion with the next line.
The damage of can be recovered to the same level as the unrecorded part. After the end of rescanning, the first line is broken.

Next, printing is performed by scanning the second line. At this time, the dyeing layer 6A at the position corresponding to the print width h of the second line has no surface roughness and is uniformly uniform regardless of whether it is an overlapping portion or not. Therefore, even after the recording scan of the second line, the damage of the recording sheet 6 of the second line is equivalent to that of performing the recording scan only once, and the dyeing layer 6A is formed between the first and second lines. The difference in gloss due to damage is eliminated. 2
In the printing of the line, the mask circuit 19 processes the portions overlapping the first and third lines so that the density becomes lower toward the end. Then, after the printing by the scanning of the second line, the damage of the overlapped printing portion with the next line is recovered by the rescanning similarly to the first line, and the line feed is performed.

Thereafter, similar to the process of the second line, printing by the printing scan in the main scanning direction, rewinding of the ink sheet 2A, damage recovery of the overlapped printing portion with the next line by rescanning, and line feed are repeated on the recording paper 6. Record one page.

As described above, according to the present embodiment, after recording one line, the portion of the same line that overlaps with the next line is rescanned to recover the damage of the recording paper 6 in advance, and then the next line is recorded. By doing so, uneven gloss on the surface of the recording paper 6 does not occur between the lines. In addition, since the recording is not performed on the damaged portion during the recording of the next line, uniform ink transfer can be realized. Therefore, it is possible to obtain a uniform high-quality recorded image without uneven gloss and uneven density.

Although the thermal head 1 and the ink ribbon cartridge 2 are used as the printing means in the first, second and third embodiments, other printing means capable of multi-gradation recording (eg ink jet head). But it doesn't matter.

Further, in the first embodiment, when re-scanning, uniform heating energy is applied to the heating element 1A of the thermal head 1 at a position corresponding to the overlapping printing portion over one line. It is also conceivable to change the energy for each dot in accordance with the gradation print data used for, and rescanning according to the damage of the recording paper 6 is possible. Further, if the gradation print data used for recording the overlapped printing portion is larger than a predetermined value, it is considered that the recording paper 6 in that portion is greatly damaged, and recording energy is selectively applied to the portion for rescanning. It is also possible to recover damage.

Further, in the first and third embodiments, the ink ribbon 2A is rewound by the length of one line for saving before rescanning, but the ink ribbon 2A is not rewound and is unused. It is also possible to use the part of (1) for rescanning.

In the second embodiment, the pattern of the ink ribbon 2A is repeated as shown in FIG. 5 so that the ink ribbon 2A is rewound by the length of one line before rescanning. It is also conceivable that an uncoated portion not coated with ink is provided between the YMC patterns as in 6, and the uncoated portion is used during rescanning without rewinding the ink ribbon 2A before rescanning. .

In the second embodiment, the YMC three color ink ribbon 2A is used for color recording.
Even when the ink ribbon 2A having a configuration of four colors of YMC + black or two colors of black + red is used, the effect can be obtained by performing the same printing method.

In the third embodiment, an example of monochromatic recording is shown, but the present invention can be applied to color recording. In that case, the ink ribbon cartridge 2 shown in FIG. A method of rescanning the row for each color recording and a method of rescanning the row after the recording of one row (three colors) are completed can be considered.

[0045]

As described above, according to the present invention, in a serial printer for performing overlap recording by providing a portion for overlapping printing with the preceding and following lines, the recording energy applied to the recording element is recorded during normal recording scanning. By rescanning the overlapped printing part as low energy compared to the energy, the overlapping printed part of the recording paper is softened at low temperature and smoothed by the pressing force of the thermal head, and peeled off without being fused to the ink ribbon. It is possible to recover damage and obtain a uniform high-quality recorded image with no uneven gloss on the surface of the recording paper.

Further, it is effective not only for single-color recording but also for color recording, and by changing the rescanning method, it is possible to eliminate uneven recording density due to damage on the surface of the recording paper.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration for realizing a printing method of a serial printer according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a printing method in the embodiment.

FIG. 3 is a sectional view of a recording sheet according to the embodiment.

FIG. 4 is a flowchart showing a printing method according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of an ink ribbon cartridge in the embodiment.

FIG. 6 is a configuration diagram of another ink ribbon cartridge in the embodiment.

FIG. 7 is a flowchart showing a printing method according to a third embodiment of the present invention.

FIG. 8 is a configuration diagram of a serial printer.

FIG. 9 is a configuration diagram of a thermal head of a serial printer.

FIG. 10 is a diagram showing an overlap recording method in a serial printer.

FIG. 11 is a diagram showing a surface state of a recording sheet by overlapping recording in a conventional serial printer.

FIG. 12 is a configuration diagram of recording paper.

[Explanation of symbols]

 1 Thermal Head 2 Ink Ribbon Cartridge 3 Carriage 5 Platen 6 Recording Paper 6A Dyeing Layer 14 Print Control Circuit 19 Mask Circuit

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Claims (10)

[Claims] 1. A series of operations in which a recording head having a plurality of recording elements is driven in the main scanning direction while being driven according to print data to perform recording for one line, and then a line feed is performed in the sub scanning direction. Is a printing method of a serial printer for recording a desired image on a recording paper by repeating the line feed width in the sub-scanning direction shorter than the scanning width in the main scanning direction, Printing method of a serial printer, characterized in that overlap recording is performed so as to overlap a predetermined number of print dots with the above scanning, and the overlapping portion is again scanned while driving the recording element with a predetermined recording energy. . 2. The printing method of a serial printer according to claim 1, wherein the recording energy applied to the recording element at the time of rescanning is controlled according to the print data when the overlapping portion is recorded. 3. The printing of a serial printer according to claim 1, wherein the printing energy is applied to the printing element at the time of rescanning only at a portion where the print data when the overlapping portion is printed is a predetermined value or more. Method. 4. The first line is recorded and then a line feed is performed, the second line is overlap-recorded with the first line, and the second line corresponds to a portion overlapping with the first line. 2. The printing method for a serial printer according to claim 1, wherein only the recording element that is driven is driven to scan the second row again. 5. The first line is color-printed by scanning a large number of times and then a line feed is performed, and the second line is overlap-recorded with the first line by a large number of scanning similarly to the first line. 2. The serial printer according to claim 1, further comprising driving only a recording element corresponding to a portion of the second row that overlaps with the first row to scan the second row again. Method. 6. A first row is recorded, and only the recording element corresponding to the portion of the first row that overlaps the second row is driven to scan the first row again and then a line feed is performed. The printing method for a serial printer according to claim 1, wherein the second line and the first line are overlapped and recorded. 7. A serial printer for performing desired image recording by transferring an ink of an ink sheet to the recording sheet with an ink sheet interposed between the recording head and the recording sheet, wherein 7. The printing method for a serial printer according to claim 4, wherein the ink sheet used for scanning is reused when rescanning the same row. 8. The recording energy applied to the recording element during rescanning of the first or second row is such that the ink of the ink sheet does not transfer to the recording paper. Printing method of serial printer. 9. In a serial printer for performing desired image recording by transferring ink of an ink sheet to the recording sheet with an ink sheet interposed between the recording head and the recording sheet, the ink sheet is coated with ink. 7. The non-inked portion of the ink sheet is used when rescanning the first or second row. Printing method of the serial printer described. 10. The printing method for a serial printer according to claim 1, wherein the scanning speed during recording and the scanning speed during rescanning are made different.