JP3584114B2 - Printer - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a printer. In particular, it relates to an improvement in the paper feed mechanism.
[0002]
[Prior art]
FIG. 8 is a schematic side view showing a main part of a conventional printer, and FIG. 9 is a perspective view of the same main part.
[0003]
In these drawings, reference numeral 1 denotes a paper feed roller, which is rotationally driven by a drive mechanism (not shown). Reference numeral 2 denotes a paper feed guide provided along the paper feed roller 1. Reference numerals 3 and 4 denote first and second pressing rollers provided on the paper feeding guide 2, which are pressed against the paper feeding roller 1 by urging means (not shown) to press the paper P against the paper feeding roller 1. It has become.
[0004]
The paper P is brought into close contact with the paper feed roller 1 by the pressing of the first and second pressing rollers 3 and 4, and is conveyed with a conveying force.
[0005]
The head 8 is an ink jet head, and has a nozzle row N including a plurality of nozzles n, as shown in FIG. The head 8 selectively ejects ink droplets from the nozzles n while moving in the direction of the arrow X11 or X22 in the drawing to print characters and other images on the paper P. P1 indicates a printing area formed by one printing operation by the head 8, and is equal to the length L of the nozzle row N.
[0006]
When one printing operation is completed, the paper P is fed by the paper feed roller 1 by the length L in the direction of arrow Y, and the head 8 prints on the next print area P2.
[0007]
[Problems to be solved by the invention]
In the conventional printer described above, the first and second pressing rollers 3 and 4 are arranged in a line on the axes X3 and X4 parallel to the axis X1 of the paper feed roller 1 as shown in FIG. Therefore, there were the following problems.
[0008]
That is, the first pressing roller 3 will be described as an example. As shown in FIG. 10, the first pressing roller 3 is pressed against the paper feed roller 1 with a pressing force F1 by an urging means (not shown). When the trailing edge PE of the sheet P comes off the first pressing roller 3, the trailing edge PE of the sheet P tries to be pushed out in the sheet feeding direction (the direction of the arrow Y1) by the pressing force F1.
[0009]
As shown in FIG. 9, all of the plurality of first pressure rollers 3 are arranged in a line on the axis X3. As a result, the rear end portion PE of the sheet P is strongly repelled.
[0010]
For this reason, the paper is fed more than the desired paper feed amount, and a situation occurs in which the pitch of the paper feed amount is shifted.
[0011]
When such a pitch shift occurs, the print areas P1 and P2 shown in FIG. 11 are separated from each other, and depending on the print pattern, the separated area appears as a white streak on the print surface.
[0012]
Such a situation similarly occurs when the trailing end portion PE of the sheet P comes off the second pressing roller 4.
[0013]
In particular, when a full-color image is to be obtained by an inkjet head, for example, as shown in FIG. 12, three nozzle rows NR, NB, and NY are provided in the head 8 ', and red (magenta) , A blue (cyan) ink droplet from the nozzle row NB, and a yellow (yellow) ink drop from the nozzle row NY, respectively, to form a full-color image. In this case, the arrangement of the nozzles n constituting the nozzle row is, for example, as shown in FIG. 13, the nozzles n of each color are arranged not linearly in a direction orthogonal to the paper feed direction Y1, and as shown in FIG. Then, a high-resolution color image is formed by intentionally partially overlapping the print areas P1 and P2 and overlapping ink droplets of different colors. The overlapping portion P12 between the printing regions P1 and P2 is formed by printing the printing region P1 and then feeding the paper P by the length L12. At this time, different overlapping colors P12 In order to make the ink droplets overlap properly, the minimum paper feed unit is a high paper feed accuracy, at least the distance between the nozzles closest to each other in the paper feed direction of the nozzle row (for example, Lp in FIG. 13). Paper feed accuracy is required.
[0014]
However, as described above, if the pitch of the paper feed amount is shifted by flipping the trailing edge of the paper, white streaks appear, and there is a problem that the white streaks become conspicuous in full-color printing. Was.
[0015]
In addition, coated paper and the like that are generally used when performing full-color printing are thicker than plain paper, so the trailing edge of the paper is greatly repelled by the pressure roller, and the white stripes are more conspicuous. It was easy.
[0016]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems, and to prevent the paper from being fed more than a desired paper feed amount when the trailing end of the paper comes off the pressure roller, and to reduce the printing surface. Another object of the present invention is to provide a printer in which white streaks are less likely to appear.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, a printer according to claim 1, further comprising a paper feed roller for feeding paper, a plurality of pressure rollers arranged in the axial direction of the paper feed roller and pressing the paper against the paper feed roller; Printing means for performing printing on the paper fed by the feed roller, wherein at least one of the plurality of pressure contact rollers arranged in the axial direction is downstream of the other pressure contact rollers in the paper feed direction. And further downstream from the pressing roller, which is displaced downstream, and upstream from the printing means. A pressure contact roller different from the pressure contact roller is provided, and printing is performed by the printing unit before the trailing end of the sheet comes off from the pressure contact roller. After the trailing edge of the paper comes off, printing by the printing means is not performed. Iko And features.
[0018]
According to a second aspect of the present invention, in the printer according to the first aspect, the plurality of pressure contact rollers are disposed so as to be substantially equally pressed against at least one fixed-size sheet. .
[0019]
According to a third aspect of the present invention, in the printer according to the first or second aspect, the printing unit includes a plurality of nozzle rows for discharging inks of different colors, and color printing is performed by discharging ink from each of the nozzle rows. Wherein the paper feed roller feeds the paper at a paper feed amount with the minimum feed unit being the distance between the nozzles closest to each other in the paper feed direction of the inkjet head. Features.
[0020]
[Effects]
According to the printer of the first aspect, the paper is conveyed by being pressed against the paper feed roller by the plurality of pressure contact rollers arranged in the axial direction of the paper feed roller.
[0021]
Since the pressing roller is pressed against the paper feed roller, when the rear end of the paper comes off from the pressing roller, the rear end of the paper tries to flip out in the paper feeding direction.
[0022]
However, according to the printer according to the first aspect, at least one of the plurality of pressing rollers arranged in the axial direction is displaced downstream of the other pressing rollers in the sheet feeding direction. With this configuration, the rear end of the sheet first comes off from the other pressing roller, and then comes off from the pressing roller that is shifted to the downstream side in the sheet feeding direction.
[0023]
In other words, the trailing end of the sheet gradually comes off from the plurality of pressing rollers arranged in the axial direction.
[0024]
Therefore, the rear end portion of the sheet is not simultaneously ejected by a strong force by all of the plurality of pressing rollers arranged in the axial direction as in the related art, and is gradually pushed out by a relatively weak force. It will be in a state like that. As a result, it is possible to prevent the paper from being fed beyond the desired paper feed amount.
[0025]
Therefore, according to the printer of the first aspect, it is possible to obtain an effect that the pitch shift is suppressed and the white streak is hardly displayed on the printing surface.
[0026]
Therefore, the configuration according to claim 1 includes a plurality of nozzle rows for discharging inks of different colors, and color printing is performed by discharging ink from each of the nozzle rows. In particular, a printer having an inkjet head that can perform printing and a paper feed roller that feeds the paper at a paper feed amount that has a minimum feed unit that is a distance between nozzles that are closest to each other in the paper feed direction of the inkjet head. It is valid.
[0027]
That is, in a case where full-color printing is to be performed by ejecting inks of different colors from the respective nozzle rows, printing is performed by overlapping printing areas as described above. According to the configuration, the pitch deviation is suppressed and a high paper feeding accuracy is obtained, so that the printing areas can be accurately overlapped. Therefore, white streaks hardly appear on the printing surface, and a high-quality color image can be obtained.
[0028]
Further, according to the configuration of the first aspect, even when performing full-color printing using thick coated paper or the like, when the rear end of the paper comes off from the pressing roller, it is not strongly repelled. In addition, white streaks are less likely to appear on the printed surface, and a high-quality color image can be obtained.
[0029]
According to the printer according to the second aspect, in the printer according to the first aspect, the plurality of pressure-contact rollers are disposed so as to be approximately equally pressed against at least one fixed-size sheet. The trailing edge of one fixed-size sheet is pushed out with a relatively weak force evenly to the left and right, even when it comes off from the other pressure roller described above, or when it comes off the pressure roller that is shifted downstream. It will be.
[0030]
Therefore, according to the printer of the second aspect, an effect is obtained that the paper is hard to skew.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0032]
First, the basic configuration of the main part will be described.
[0033]
FIG. 1 is a partially omitted perspective view showing a basic configuration of a main part, and FIG. 2 is an enlarged schematic side view of the same.
[0034]
In these drawings, 10 is a paper feed roller, and 11 is a pressure roller row.
[0035]
The paper feed roller 10 is driven to rotate by a drive mechanism (not shown).
[0036]
The pressure roller row 11 has a plurality of pressure rollers 11a and 11b pressed against the paper feed roller 10 by urging means (not shown). As shown in FIG. 1, the plurality of pressure contact rollers 11a and 11b are on a displacement axis X1A having a displacement portion X1B parallel to the axis X10 of the paper feed roller 10 and partially displaced downstream in the paper feed direction Y11. And the pressing roller 11b is arranged to be shifted downstream with respect to the pressing roller 11a in the sheet feeding direction (Y11 direction).
[0037]
The displacement amount S of the pressing roller 11b with respect to the pressing roller 11a is set so that the trailing end portion PE of the sheet P is not simultaneously disengaged from the pressing roller 11a and the pressing roller 11b in the process of transporting the sheet P. . That is, as shown in FIG. 2, the displacement amount S is always pressed by the downstream pressing roller 11b when the rear end portion PE of the paper P comes off the upstream pressing roller 11a. It is set as follows.
[0038]
As a result, the rear end portion PE of the sheet P first comes off the pressure contact roller 11a, and then comes off the pressure contact roller 11b which is shifted downstream.
[0039]
That is, among the pressing rollers forming the pressing roller row 11, the pressing roller 11b is arranged to be shifted downstream of the pressing roller 11a in the sheet feeding direction, so that the rear end portion PE of the sheet P is pressed. It will come off from the roller row 11 step by step.
[0040]
Therefore, the rear end portion PE of the sheet P is not simultaneously repelled by a strong force by all the pressing rollers 11a and 11b constituting the pressing roller row 11, so that the upstream pressing roller 11a From the pressing roller 11b on the downstream side with a relatively weak force.
[0041]
Thereby, it is suppressed that the paper P is sent more than the desired paper feed amount.
[0042]
Therefore, according to the above-described configuration, it is possible to obtain an effect that a pitch shift is suppressed and a white streak hardly appears on a printing surface.
[0043]
Next, an embodiment of a printer having the above-described basic configuration will be described.
[0044]
FIG. 3 is a partially omitted side view showing an embodiment of the printer according to the present invention, FIG. 4 is a schematic side view thereof, and FIG. 5 is a partially omitted perspective view of a paper feed guide.
[0045]
In the present embodiment, two pressure contact roller rows having the same basic configuration as the pressure contact roller row 11 described above are provided for two paper feed rollers 330 of the paper feed device 300 described later. These two pressure contact roller rows are indicated by reference numerals 351 and 352 in FIGS. For the sake of convenience in the following description, the pressing roller row denoted by reference numeral 351 is referred to as a first pressing roller row, and the pressing roller row denoted by reference numeral 352 is referred to as a second pressing roller row.
[0046]
In FIG. 3, reference numeral 100 denotes a paper feeder, 200 denotes an ink jet printer main body, 300 denotes a paper feeder, 410 denotes a head for full-color printing as printing means, and 420 denotes a head for monochrome printing.
[0047]
The paper feeding device 100 includes a paper support 110, a pair of hoppers 120 (only one side is shown in the drawing), and a pair of paper feeding rollers 130 (only one side is shown in the drawing).
[0048]
On the upper surfaces of the paper support 110 and the pair of hoppers 120, a sheet (not shown) to be fed is placed.
[0049]
The pair of hoppers 120 can support both sides of the front part of the sheet, and are slidably inserted through the support rod 140.
[0050]
The pair of paper feed rollers 130 is composed of a D-shaped roller having a rubber layer on the surface, and is fixed to a grooved paper feed roller shaft 131. The paper feed roller shaft 131 is rotatably supported by a side frame (not shown) of the printer main body 200 via a bearing, and is rotated at the time of paper feeding by a drive mechanism (not shown) of the printer main body 200.
[0051]
In FIG. 3, a paper feed device 300 includes a paper feed roller 330 that is rotationally driven by a drive mechanism (not shown), and the first and second pressure roller rows 351 and 352 provided for the paper feed roller 330. have. The drive mechanism includes a step motor (not shown) that makes one rotation with a predetermined pulse.
[0052]
The rotation accuracy of the paper feed roller 330, which is rotationally driven by such a driving mechanism, is such that the distance between the nozzles closest to each other in the paper feed direction of the ink jet head described later, for example, (1/720) inch is the minimum feed unit. The paper can be fed by the feed amount.
[0053]
3, 4, and 5, reference numeral 350 denotes a paper feed guide provided along the paper feed roller 330. The paper feed guide 350 is provided with the first and second pressing roller rows 351 and 352. I have.
[0054]
The first pressure roller row 351 has a plurality of pressure rollers 351a and 351b pressed against the paper feed roller 330 by urging means (not shown). These pressure contact rollers 351a and 351b are arranged on the displacement axis X351, and the pressure contact roller 351b is arranged to be displaced by the displacement S in the sheet feed direction (Y11 direction) downstream with respect to the pressure contact roller 351a. ing.
[0055]
FIG. 6 is a schematic plan view showing an example of the arrangement of the pressing rollers of the first pressing roller row 351.
[0056]
In the figure, the first pressing roller row 351 has nine pressing rollers in total, and four pressing rollers 351b out of the five pressing rollers 351b are fed to the upstream pressing rollers 351a in the sheet feeding direction ( It is arranged on the downstream side in the Y11 direction by being shifted by the displacement amount S.
[0057]
PA1 in the figure indicates a postcard-size sheet fed vertically by the paper feed roller 330, PA2 indicates a postcard-size sheet sent in a horizontal state, and PA3 indicates a vertical state. And A4 indicate B5 size paper sent in a landscape state, respectively.
[0058]
The pressing rollers 351a and 351b press the papers PA1, PA2, PA3, and PA4 substantially equally to the left and right.
[0059]
For example, a description will be given of a postcard-size sheet PA2 arranged in a horizontal state. As shown in the figure, three press-contact rollers 351a are almost equally pressed on the sheet PA2 on the upstream side in the sheet feeding direction. Then, on the downstream side, the two pressure contact rollers 351b are pressed substantially equally to the left and right. Also, with respect to the A4 size paper PA3 arranged in the vertical position, four pressing rollers 351a are almost equally pressed on the upstream side in the sheet feeding direction, and three pressing rollers 351b are almost equally pressed on the downstream side. Crimp.
[0060]
4 and 5, the second pressure roller row 352 has a plurality of pressure rollers 352a and 352b pressed against the paper feed roller 330 by urging means (not shown). These pressure contact rollers 352a and 352b are arranged on the displacement axis X352, respectively, and the pressure contact roller 352b is displaced from the pressure contact roller 352a by a displacement amount S downstream in the sheet feeding direction (Y11 direction). Has become. As shown in FIG. 4, as the pressure contact rollers 352a and 352b, those having a smaller diameter than the pressure contact rollers 351a and 351b of the first pressure roller row 351 are employed. Other configurations of the second pressure roller row 352 are the same as those of the first pressure roller row 351.
[0061]
3 and 4, reference numeral 340 denotes the most downstream position in the sheet feeding direction, that is, further downstream from the pressing roller 352b shifted to the downstream side. And upstream of the inkjet heads 410 and 420 And presses the paper P against the paper feed roller 330 by urging means (not shown), and moves the paper P wound and conveyed by the paper feed roller 330 to a position below the ink jet heads 410 and 420. The feed angle to feed toward is specified.
[0062]
In the present embodiment, Before the trailing edge PE of the paper comes off the pressure roller 340, printing is performed by the inkjet heads 410 and 420, After the trailing edge PE of the sheet P comes off from the pressing roller 340, printing by ink jet heads 410 and 420 described later is not performed. Therefore, even if the rear end portion PE of the paper P is repelled from the pressing roller 340, the printing quality is not deteriorated. For this reason, it is not necessary for the pressure roller row 340 to have the same basic configuration as the pressure roller row 11 described above.
[0063]
According to the paper feeding device 100 and the paper feeding device 300 as described above, the paper placed on the paper support 110 is pressed against the paper feeding roller 130 by the pair of hoppers 120 during paper feeding, and the paper feeding roller 130 rotates. Is fed to the paper feeding device 300 by the The fed paper is pressed and wound on the paper feed roller 330 by the first pressure roller row 351, the second pressure roller row 352, and the pressure roller 340, and the feed angle is adjusted by the pressure roller 340. It is regulated and transported to the printing section A (see FIG. 3).
[0064]
The head 410 for full-color printing and the head 420 for monochrome printing are mounted on the carriage 430 in a state where they are arranged in a direction orthogonal to the plane of the paper of FIG. 3. (A) It moves in the direction of the middle arrow X11 or X22.
[0065]
The head 410 has nozzle rows NR, NB, and NY composed of a plurality of nozzles n. Red (magenta) ink droplets from the nozzle row NR and blue (cyan) ink drops from the nozzle row NB. In addition, the configuration is such that yellow (yellow) ink droplets can be respectively ejected from the nozzle row NY. In the drawing, reference numeral P1 represents a print area where printing is performed by the nozzle arrays NR, NB, NY in one printing operation.
[0066]
The head 420 has a nozzle row N composed of a plurality of nozzles n, and can eject black ink.
[0067]
In this embodiment, the distance Lp between the nozzles n, n that are closest to each other in the sheet feeding direction Y of each nozzle row of the head 410 is (1/720) inch. The paper feed roller 330 can feed the paper P by a paper feed amount with the distance Lp between the nozzles n, n being the minimum feed unit.
[0068]
When monochrome printing is performed by the head 420, the motor is rotated by a predetermined number of steps, whereby the paper feed roller 330 is rotated by an amount equal to the length L of the nozzle row N of the head 420. Then, printing is performed by the head 420 for each predetermined printing area P1.
[0069]
When performing high-resolution full-color printing, the motor is rotated by the required number of steps, and the distance Lp (1/720 inch) between the nozzles n, n which is closest in the paper feed direction of the head 410 is determined. The paper feed roller 330 is rotated by an arbitrary feed amount in the minimum feed unit, and three colors of ink are selectively ejected from the head 410 to perform full-color printing. For example, as shown in FIG. 7B, after printing in the print area P1, the motor is rotated by a predetermined step (length L12), and the upper part of the next print area P2 is placed below the print area P1. Full-color printing is performed by overlapping printing. In this case, the printing area P12 is an area where printing is performed in an overlapping manner.
[0070]
As shown in FIG. 3, the paper P printed by the heads 410 and 420 is transported by transport roller pairs 251 and 252 and paper discharge roller pairs 261 and 262, and is located above the hopper 120 via the discharge unit 270. The paper is discharged onto the paper discharge tray 280.
[0071]
According to the printer of the present embodiment described above, the first and second pressing roller rows 351 and 352 have the same configuration as the above-described pressing roller row 11 of the basic configuration. When the trailing end portion PE of the paper P passes through the pressure contact roller rows 351 and 352, it is possible to suppress the occurrence of a pitch shift and to obtain high paper feeding accuracy. Therefore, an effect is obtained that white streaks hardly appear on the printing surface.
[0072]
It is desirable that both the first and second pressing roller rows 351 and 352 have the above-described configuration as in the printer according to the above-described embodiment. In the case where the number of rows must be limited to only one row, it is desirable that the second pressure roller row 352 provided on the downstream side in the paper feeding direction has the above-described configuration. The second pressure roller row 352 is located downstream of the first pressure roller row 351, and is located closer to the inkjet heads 410 and 420 than the first pressure roller row 351. For this reason, it is more effective to suppress the trailing edge of the sheet on the side closer to the heads 410 and 420.
[0073]
According to the printer of the present embodiment, a head 410 capable of performing color printing and a paper feed rotating at a paper feed amount with the distance Lp between the nozzles n, n in the paper feed direction of the head 410 as a minimum feed unit. The provision of the roller 330 provides the following operational effects.
[0074]
That is, when full color printing is to be performed by ejecting inks of different colors from each nozzle row, as described above, printing is performed by overlapping printing areas. According to the printer, the pitch deviation of the paper feed amount is suppressed, and a high paper feed accuracy is obtained, so that the print areas can be accurately overlapped. Therefore, white streaks hardly appear on the printing surface, and a high-quality color image can be obtained.
[0075]
Further, according to the printer of the present embodiment, even when performing full-color printing using thick coated paper or the like, when the rear end of the paper comes off the pressure roller, the paper is not strongly repelled. Therefore, white streaks hardly appear on the printing surface, and a high-quality color image can be obtained.
[0076]
Further, the first pressure roller row 351 of the first and second pressure roller rows 351 and 352 will be described as an example. As shown in FIG. 6, the pressure roller 351a of the first pressure roller row 351, 351b is any one of postcard-size paper PA1 and PA2 conveyed vertically or horizontally, A4 size paper PA3 conveyed vertically, and B5 size paper PA4 conveyed horizontally. Since the papers are arranged so as to be pressed equally to the right and left sides of the paper, at least the trailing end of the paper of these sizes also comes off the downstream pressure contact roller 351b when coming off the upstream pressure roller 351a. In such a case, the right and left sides are evenly extruded with a relatively weak force.
[0077]
Therefore, according to the printer of the present embodiment, it is possible to obtain an effect that these sheets are unlikely to skew.
[0078]
Further, even for paper of a size other than the above, if the pressing roller is arranged so that the pressing roller is pressed almost evenly to the left and right, it is possible to prevent the paper from skewing. is there.
[0079]
As described above, one embodiment of the present invention has been described, but the present invention is not limited to the above embodiment, and can be appropriately modified and implemented within the scope of the present invention.
[0080]
For example, the invention described in claim 1 or 2 is not limited to a printer having the above-described ink-jet type head, but can be applied to other types of printers, such as a thermal transfer printer and a laser printer.
[0081]
Further, the pressing roller row may have a configuration in which at least one pressing roller among a plurality of pressing rollers arranged in the axial direction is arranged so as to be shifted downstream of the other pressing rollers in the sheet feeding direction. The number of rows and the number of pressing rollers are arbitrary.
[0082]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the effect that a white streak does not appear easily on a printing surface is acquired.
[0083]
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating a basic configuration of a main part of a printer according to the invention.
FIG. 2 is an enlarged schematic side view of a main part in the same manner.
FIG. 3 is a partially omitted side view showing an embodiment of the printer according to the present invention.
FIG. 4 is a schematic side view showing a paper feeding device.
FIG. 5 is a partially omitted perspective view of a paper feed guide.
FIG. 6 is a schematic plan view showing an example of the arrangement of the pressing rollers of the first pressing roller row.
FIGS. 7A and 7B are plan views schematically showing a printing operation.
FIG. 8 is an explanatory diagram of a conventional technique.
FIG. 9 is an explanatory diagram of a conventional technique.
FIG. 10 is an explanatory diagram of a conventional technique.
FIG. 11 is an explanatory view of a conventional technique.
FIG. 12 is an explanatory diagram of a conventional technique.
FIG. 13 is an explanatory diagram of a conventional technique.
[Explanation of symbols]
11 Pressure roller row
11a, 11b Press roller
351 Pressure roller row
351a Pressure roller
351b Pressure roller
330 Paper feed roller

Claims (3)

A paper feed roller for feeding the paper, a plurality of pressure rollers arranged in the axial direction of the paper feed roller to press the paper against the paper feed roller, and printing means for printing on the paper fed by the paper feed roller; And at least one of the plurality of pressing rollers arranged in the axial direction is arranged to be shifted downstream of the other pressing rollers in the sheet feeding direction, and shifted to the downstream side. A pressure roller different from the pressure roller is provided further downstream than the pressure roller arranged and upstream of the printing means, and the printing means uses the pressure roller before the trailing end of the sheet comes off from the pressure roller. printer after printing out the bottom edge of the sheet from the pressure roller is performed, wherein the go, such is performed printing by said printing means. 2. The printer according to claim 1, wherein the plurality of pressure contact rollers are disposed so as to be pressed equally to at least one sheet of a standard size. The printing unit is an inkjet head that includes a plurality of nozzle arrays that eject inks of different colors, and that can perform color printing by ejecting ink from each of the nozzle arrays. 3. The printer according to claim 1, wherein the paper is fed by a paper feed amount in which a distance between nozzles closest to each other in a paper feed direction of the head is a minimum feed unit.

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