JP2016182722A - Recording device and recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a radiation discharge phenomenon, and deviation of an impact position of a liquid.SOLUTION: A liquid discharge head 9 according to the present invention comprises a nozzle array 10 in which, plural nozzles N for discharging a liquid, are arranged in a first direction A, and the liquid discharge head comprises on both ends of the nozzle array 10, inclination discharge nozzles N(s) which have a discharge direction 27 where is different from a standard direction and approaches to the standard direction, if a discharge direction 27 of a central nozzle N(c) of the nozzle array 10 is the standard direction. Plural nozzles in a partial and inside range from both outermost nozzles of the nozzle array 10, are the inclination discharge nozzles N(s), and inclination angles s of the respective inclination discharge nozzles N(s) become gradually smaller as going to the center from both end sides of the nozzle array 10.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a liquid discharge head such as a liquid discharge head and an ink jet recording apparatus having a nozzle row in which a plurality of nozzles for discharging a liquid are arranged in one direction.

Conventionally, a recording apparatus including a recording head having a plurality of nozzle rows has been used. For example, as disclosed in Patent Document 1, a plurality of nozzle arrays are arranged so as to be shifted from each other along the conveyance direction of the recording medium, and reciprocally move in a direction crossing the conveyance direction to perform bidirectional recording. A recording apparatus having a recording head is used. Here, the plurality of nozzles forming the nozzle row have the same liquid discharge direction. The discharge direction is usually perpendicular to the nozzle surface.
On the other hand, recording apparatuses capable of recording on various types of recording media are used. In such a recording apparatus, in order to support various types of media (material, thickness, etc.), the distance (paper gap: PG, working gap: WG, etc.) between the nozzle surface of the recording head and the medium facing the medium. Called) is changed in accordance with the type of the medium.

JP 2007-98866 A

In recent years, the types of media on which recording is performed by a recording apparatus has increased, and there is a medium in which the interval needs to be set larger. For example, a cloth with fluff on the surface.
However, when the interval is increased, there has been a problem that the landing position of the liquid droplets such as ink droplets ejected from the nozzles of the recording head is shifted.
As a result of examining the cause of the problem, the liquid ejection direction of each nozzle in the nozzle array is made perpendicular to the nozzle surface, but the actual flight direction of the ink droplets ejected from each nozzle is all on the nozzle surface. It has been found that there is a phenomenon in which ejection is performed radially outward in the direction of the nozzle row, not in the vertical direction, and this phenomenon is found in the background of the deviation of the landing position (this phenomenon is hereinafter referred to as “radial ejection phenomenon”) Called). This radiation discharge phenomenon will be further described later.
That is, when the interval is small, even if a radiation ejection phenomenon occurs, it does not affect the recording quality, that is, the problem of deviation of the landing position based on the radiation ejection phenomenon does not become obvious, but when the interval becomes large, the radiation It was found that the problem of deviation of the landing position based on the discharge phenomenon is easily manifested.
Furthermore, in the case of a serial type printer, the extent of the radiation ejection phenomenon varies to some extent depending on the moving speed of the carriage on which the recording head is mounted, the recording duty, the size of the ink droplets ejected from the nozzle array, etc. The inventors have confirmed. As the carriage moving speed increases and the recording duty increases, the deviation of the landing position due to the radiation discharge phenomenon tends to increase.

  An object of the present invention is to suppress the radiation discharge phenomenon and thereby suppress the deviation of the landing position of the liquid.

  In order to solve the above-described problem, a liquid discharge head according to a first aspect of the present invention is a liquid discharge head having a nozzle row in which a plurality of nozzles that discharge liquid are arranged in a first direction. When the discharge direction of the central nozzle is set as a reference direction, inclined discharge nozzles having discharge directions in directions different from the reference direction and approaching the reference direction are provided at both ends of the nozzle row.

  The liquid ejection head according to a second aspect of the present invention is the liquid ejection head according to the first aspect, wherein a plurality of nozzles in a partial range inside both endmost nozzles of the nozzle row are the inclined ejection nozzles. To do.

  The liquid ejection head according to a third aspect of the present invention is characterized in that, in the second aspect, the ratio of the inclined ejection nozzles is 10% or less of the total number of nozzles constituting the nozzle row.

  In the liquid ejection head according to a fourth aspect of the present invention, in the second aspect or the third aspect, the inclination angle of the inclined discharge nozzle gradually decreases from both ends of the nozzle row toward the center. It is characterized by.

  The liquid ejection head according to a fifth aspect of the present invention is the liquid ejection head according to the second aspect or the third aspect, wherein the inclination angle of the inclined discharge nozzle is gradually reduced from both ends of the nozzle row toward the center. It has the part which becomes.

  A liquid ejection apparatus according to a sixth aspect of the present invention includes a liquid ejection head having a nozzle row in which a plurality of nozzles that eject liquid are arranged in the first direction, and relatively moves the liquid ejection head and the medium. A liquid discharge apparatus that discharges liquid onto the medium according to claim 1, wherein the liquid discharge head is the liquid discharge head described in any one of the first to fifth aspects. .

  The liquid ejection apparatus according to a seventh aspect of the present invention is the liquid ejection device according to the sixth aspect, wherein the relative movement in the intermittent conveyance is provided with a conveyance unit that intermittently conveys the medium in the first direction and the liquid ejection head. And a carriage that moves in a second direction that intersects with the first direction, and the nozzle surface of the liquid ejection head protrudes toward the medium side from an adjacent periphery.

  According to an eighth aspect of the present invention, in the sixth aspect or the seventh aspect, the liquid ejection head includes a plurality of unit heads, and each unit head is spaced apart in the first direction. The unit nozzle rows of the unit heads are arranged so that the end portions overlap each other.

  According to a ninth aspect of the liquid ejection apparatus of the present invention, in the eighth aspect, the inclined ejection nozzle is provided in the overlap portion.

  According to a tenth aspect of the liquid ejection apparatus of the present invention, in the ninth aspect, one inclined discharge nozzle of the overlap portion has a different inclination angle from the other inclined discharge nozzle. .

  According to an eleventh aspect of the liquid ejection apparatus of the present invention, in the eighth aspect, the inclined ejection nozzle is provided on one of the overlap portions, and the overlap portion is configured to discharge the liquid in the overlap portion. Among these, there is provided a control mode in which discharge from the inclined discharge nozzle is not performed, and discharge is performed from other nozzles that are not inclined.

  According to the present invention, it is possible to suppress the radiation discharge phenomenon and thereby suppress the deviation of the landing position of the liquid.

1 is a schematic side view illustrating a liquid ejection device according to an embodiment of the present invention. The schematic bottom view showing the nozzle surface of an example of the liquid discharge head in one Embodiment same as the above. The block block diagram of the liquid discharge apparatus which concerns on one Embodiment same as the above. The bottom view (A) of the nozzle row part in the conventional liquid discharge head, the principal part longitudinal cross-sectional view (B), and the schematic diagram (C) explaining the liquid discharge direction and radiation discharge state of each nozzle. The figure which measured and represented the relationship of the shift | offset | difference of a nozzle position and a landing position about one nozzle row in the conventional liquid discharge head. The schematic diagram explaining the state by which the liquid discharge direction and radiation | emission discharge phenomenon of each nozzle of one nozzle row which concern on Embodiment 1 of this invention were suppressed. The schematic diagram explaining the liquid discharge direction of each nozzle of one nozzle row which concerns on Embodiment 2 of this invention. The schematic diagram explaining the liquid discharge direction of each nozzle of one nozzle row which concerns on Embodiment 3 of this invention. The schematic diagram explaining the liquid discharge direction of each nozzle of each nozzle row of the overlap part which concerns on Embodiment 4 of this invention. The schematic diagram explaining the liquid discharge direction of each nozzle of each nozzle row | line | column of the overlap part which concerns on Embodiment 5 of this invention. The schematic diagram explaining the liquid discharge direction of each nozzle of each nozzle row of the overlap part which concerns on Embodiment 6 of this invention.

Hereinafter, a liquid ejection apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic side view showing a recording apparatus according to an embodiment of the present invention in a case where the liquid ejecting apparatus is an ink jet recording apparatus (hereinafter sometimes simply referred to as “recording apparatus”).

◆◆ Recording device (liquid ejection device) ◆◆
As shown in FIG. 1, the recording apparatus 1 according to this embodiment includes a recording head 9 that is a liquid ejection head, and a transport that transports a recording medium P in a transport direction A so as to pass through a recording execution area by the recording head 9. Part 2 is provided.
The recording head 9 is mounted on the carriage 5. The carriage 5 is guided by a guide shaft (not shown) and reciprocates in the scanning direction B intersecting the transport direction A. In the present embodiment, the transport unit 2 intermittently transports the recording medium P in the transport direction A by the control unit (FIG. 3), and the carriage 5 scans in the scanning direction B that intersects the transport direction A when the movement in the intermittent transport is stopped. Configured to move to. That is, when the conveyance of the recording medium P in the intermittent conveyance is stopped, the carriage 5 is reciprocated in the scanning direction B to discharge the liquid onto the recording medium P to perform recording.

In the present embodiment, the transport unit 2 is a transport endless belt 2 (the same reference numeral as that of the transport unit is used), and is stretched around a transport roller 3 and a driven roller 4 that rotate in the rotation direction C. The transporting endless belt 2 has a sticky surface for supporting the recording medium P. Here, “having adhesiveness” means that the surface that supports the recording medium P is coated with an adhesive that holds the recording medium P in a peelable manner. Hereinafter, an endless belt for conveyance having adhesiveness may be referred to as an “adhesive belt”.
The recording medium P is peeled off from the adhesive belt 2 within a predetermined range in the transport path on the transport roller 3 side, and taken up by the winding unit 8 via the driven roller 7 fixed at a predetermined position. It is done.
The recording apparatus 1 of the present embodiment has a configuration capable of recording on a roll-shaped recording medium P, but is not limited to such a configuration, and recording is performed on a single-sheet recording medium P. The structure which can perform is also sufficient.

  As shown in FIG. 2, in the recording head 9, a plurality of nozzles N that eject ink that is liquid are opened in the nozzle surface F. “Nozzle surface F” means the surface on which the nozzles N of the recording head 9 are formed. The plurality of nozzles N are arranged in the first direction to form the nozzle row 10. In the present embodiment, the first direction is the same as the transport direction A. Hereinafter, the first direction A is denoted by the same reference numeral as the transport direction A with respect to the first direction. In the following, the scanning direction B may also be referred to as a second direction. In this case, the scanning direction B is referred to as a second direction B.

In the present embodiment, the recording head 9 includes a plurality of unit heads 9a, 9b, 9c, 9d, and 9e. These unit heads 9a, 9b, 9c, 9d, and 9e are arranged in a staggered arrangement. Furthermore, the unit heads 9a, 9b, 9c, 9d, and 9e are arranged at equal intervals in the first direction A, and the unit nozzle rows 10 of the unit heads 9a, 9b, 9c, 9d, and 9e are The end portions are arranged so as to overlap with each other, thereby forming a nozzle row 25 for ink of one color.
Specifically, for example, the nozzle row 25 (Y) of yellow ink (Y) is configured by five unit heads 9 a (Y), 9 b (Y), 9 c (Y), 9 d (Y), and 9 e (Y). Has been. The magenta ink (M) nozzle array 25 (M) is composed of five unit heads 9 a (M), 9 b (M), 9 c (M), 9 d (M), and 9 e (M). The first nozzle to the last nozzle in the nozzle row 25 (Y) and the first nozzle to the last nozzle in the nozzle row 25 (M) are arranged in the same position in the first direction A. . The arrangement of the nozzle rows of inks of other colors (cyan (C), black (K), etc.) is also the same, so illustration and description are omitted.

  The nozzle surfaces F of the unit heads 9a, 9b, 9c, 9d, and 9e are configured to protrude toward the recording medium P from the adjacent surroundings. In this embodiment, the nozzle surface F protrudes toward the recording medium P with respect to the base surface 26 of the recording head 9, but there is a structure in which the carriage 5 protrudes as the base surface. As described above, the structure in which the nozzle surface F of the recording head 9 protrudes from the adjacent periphery is easily affected by the air flow accompanying the movement of the carriage 5, and the radiation discharge phenomenon is promoted.

The recording apparatus 1 of the present embodiment includes the recording head 9 that performs recording while reciprocating. However, the recording apparatus includes a so-called line head in which a plurality of nozzles that eject ink are provided in a direction intersecting the transport direction A. But you can.
Here, the “line head” means that the nozzle area formed in the direction intersecting the transport direction A of the recording medium P can cover the entire direction intersecting the transport direction A of the recording medium P. The recording head is used in a recording apparatus that is provided and forms an image by relatively moving the recording head or the recording medium P. It should be noted that the nozzle area in the direction intersecting the conveyance direction A of the line head may not be able to cover the entire direction intersecting the conveyance direction A of all the recording media P supported by the recording apparatus.

Next, an electrical configuration of the recording apparatus 1 according to the present embodiment will be described.
FIG. 3 is a block configuration diagram of the recording apparatus 1 of the present embodiment.
The control unit 13 is provided with a CPU 14 that controls the entire recording apparatus 1. The CPU 14 is connected via a system bus 15 to a ROM 16 that stores various control programs executed by the CPU 14, a maintenance sequence, and the like, and a RAM 17 that can temporarily store data.

The CPU 14 is connected to a head driving unit 18 for driving the recording head 9 via the system bus 15.
Further, the CPU 14 is a carriage motor 20 for moving the carriage 5 via the system bus 15, and a conveyance source that is a drive source of the driving roller 3 as a moving mechanism of the conveyance unit 2 that supports and conveys the recording medium P. The motor 21 is connected to a motor drive unit 19 for driving a motor 21 and a winding motor 22 that is a driving source of the winding unit 8.
Further, the CPU 14 is connected to the input / output unit 6 via the system bus 15, and the input / output unit 6 is connected to the PC 11, which is an external device that inputs recording data and the like to the recording apparatus 1.

◆◆ Recording head (liquid ejection head) ◆◆
Prior to specific description of an embodiment of a recording head (liquid discharge head) according to the present invention, a structure of a conventional recording head and a radiation discharge phenomenon will be described.
≪Conventional recording head and radiation discharge phenomenon≫
First, regarding the conventional recording head 9, the structure of the nozzle row 10 of one unit head 9a and the radiation ejection phenomenon will be described as a representative.
4A is a bottom view of a portion of one nozzle row 10 in the conventional recording head 9, FIG. 4B is a longitudinal sectional view of the main part, and FIG. 4C is a liquid ejection direction of each nozzle. It is a schematic diagram explaining a radiation discharge state.

As shown in FIG. 4, the plurality of nozzles N constituting the nozzle row 10 of the unit head 9a are all formed so that the ink ejection direction 27 is perpendicular to the nozzle surface F (see FIGS. 4B and 4C). )).
In FIG. 8C, reference numeral 28 indicates the flight direction of the ink droplets ejected from each nozzle N. The ink ejection direction 27 of each nozzle N in the nozzle array 10 is made perpendicular to the nozzle surface F as described above. However, all of the flight directions 28 of the ink droplets actually ejected from each nozzle N are nozzles. Discharge is spread radially outward in the direction of the nozzle row 10, not in the direction perpendicular to the surface F (radiation discharge phenomenon).
In FIG. 2B, reference numeral 29 denotes an ink chamber. A desired ink droplet is ejected from each nozzle N by applying an ejection force (pressure) by a pressurizing element (piezo element or the like) to the ink supplied to the ink chamber 29.

FIG. 5 is a diagram showing the relationship between the displacement between the nozzle position and the landing position measured for the nozzle row 10 of the conventional recording head 9. In this measurement, the distance between the nozzle surface F and the recording medium P was 2.7 mm. In FIG. 5, the nozzle positions are indicated by nozzle numbers (numbered 1 to 360) assigned in order from the one end side to the other end side in the direction of the nozzle row 10.
As can be understood from FIG. 5, the displacement of the landing positions of the ink droplets is small in the nozzle N at the center of the nozzle row 10, but the displacement of the landing positions of the nozzles N increases toward the both ends. A large shift of about 30 μm is observed at either end of the nozzle array 10.
As described above, when the interval between the nozzle surface F and the recording medium P is increased, the problem of deviation of the landing position of the ink droplet due to the radiation discharge phenomenon becomes obvious.

On the other hand, when ink is ejected using the conventional recording head 9 with the distance between the nozzle surface F and the recording medium P being 1 mm to 2 mm, the problem of deviation of the landing position of the ink droplet due to the radiation ejection phenomenon becomes obvious. There wasn't.
When the interval was increased to 3 mm, 4 mm, and 5 mm, the displacement of the landing position due to the radiation discharge phenomenon was further increased.

◆◆◆ Embodiment 1 ◆◆◆
FIG. 6 is a schematic diagram for explaining a liquid ejection direction and a radiation ejection phenomenon of each nozzle of one nozzle row according to the first embodiment of the present invention.
The recording head 9 according to the first embodiment includes a nozzle row 10 in which a plurality of nozzles that eject ink are arranged in the first direction A, and the ejection direction 27 of the nozzle N (c) in the center of the nozzle row 10 is determined. Inclined discharge nozzles N (s) having a discharge direction that is a direction different from the reference direction and approaching the reference direction (inward direction) at both ends of the nozzle row 10 when the reference direction is set.
In the first embodiment, the number of nozzles in the nozzle array 10 is 12, the number of central nozzles N (c) that form the reference direction is 2, and the number of inclined discharge nozzles N (s) is 6, which is 3 at both ends. Represented the case. The reference direction, which is the ejection direction 27 of the central nozzle N (c), is a direction perpendicular to the nozzle surface F. The inclination s of the inclined discharge nozzle N (s) with respect to the reference direction in the discharge direction 27 is θ−90. In the present embodiment, the ejection directions 27 of the remaining nozzles N (four) are the same as the central nozzle N (c) and are perpendicular to the nozzle surface F.

An example of how to determine the inclination s (= θ−90 degrees) of the inclined discharge nozzle N (s) will be described.
In the case of the nozzle row 10 described with reference to FIG. 5, since the interval is 2.7 mm and there is a deviation of 30 μm, the angle of the flying direction 28 of the ink droplet ejected from the nozzle N at the end is tan ⁻¹ ( 30/2700) ≒ 0.64 °. Based on the angle of the flying direction 28, the inclination s of the discharge direction 27 of the nozzle N at the end is designed to be 0.64 °. The inclination s of the nozzle N at the end is determined based on the flight angle, but it may be in a range that is not necessarily the same as the flight angle.
In addition, the inclination of the two nozzles N adjacent to the endmost part is also set to the same inclination s (0.64 °) in the present embodiment. This is the result of the results shown in FIG. With respect to N, the necessity of providing a difference in the inclination s is not so much seen, and the manufacturing is further facilitated.

In the above description, the number of inclined discharge nozzles N (s) is 3 at both ends of the nozzle row 10, but it is needless to say that the number is not limited to this number. Only one nozzle N located at both extreme ends may be the inclined nozzle N (s), or two or four or more nozzles in a partial range inside the extreme end nozzles N may be inclined discharge nozzles N. (S) may be used.
The ratio of the inclined discharge nozzles N (s) is preferably 10% or less of the total number of nozzles constituting the nozzle row 10. This is because manufacturing becomes easy.

According to the present embodiment, since the inclined discharge nozzles N (s) are provided at both ends of the nozzle row 10 of the recording head 9, it is possible to suppress the radiation discharge phenomenon by the inclined discharge nozzles N (s). It is. That is, as shown in FIG. 6, the outward spread of the ink droplets in the flight direction 28 is reduced by the inclination s of the inclined discharge nozzle N (s). Therefore, even if the interval between the recording medium M facing the nozzle surface Fc of the recording head 9 is increased, it is possible to suppress the deterioration of the quality of the liquid ejection product due to the deviation of the ink landing position.
Further, in the structure in which the nozzle surface Fc of the recording head 9 protrudes from the adjacent periphery (base surface 26) to the medium P side, the radiation discharge phenomenon is easily promoted by the influence of the air flow accompanying the movement of the carriage 5. However, according to the present embodiment, even in such a protruding structure, it is possible to suppress the radiation discharge phenomenon by the inclined discharge nozzle N (s), and thus the quality of the liquid discharge product due to the deviation of the liquid landing position. Can be suppressed.

◆◆◆ Embodiment 2 ◆◆◆
FIG. 7 is a schematic diagram illustrating the liquid ejection direction of each nozzle of one nozzle row according to the second embodiment of the present invention. About the common part with Embodiment 1, the same code | symbol is attached | subjected to the same part and the description is abbreviate | omitted.
The recording head 9 according to the second embodiment is configured such that the inclination angle s of the inclined discharge nozzle N (s) gradually decreases from both end sides of the nozzle row 10 toward the center. Specifically, the inclination of the inclined discharge nozzles N (s) at both end portions is 0.64 °, and the other nozzles N are linearly complemented so that the inclination s of the central nozzle N (c) is 0 °. The inclination angle can be determined. In the case of the nozzle row 10 described with reference to FIG. 5, since the total number of nozzles N in the nozzle row 10 is 360, the design is performed by reducing the amount of inclination by 0.64 / 180≈0.0035 ° from the end to the inside. do it.

  According to the present embodiment, the inclination angle s of the inclined discharge nozzle N (s) gradually decreases from both end sides of the nozzle row 10 toward the center, so that the landing position deviation due to the radiation discharge phenomenon can be more effectively suppressed. be able to.

◆◆◆ Embodiment 3 ◆◆◆
FIG. 8 is a schematic diagram illustrating the liquid ejection direction of each nozzle of one nozzle row according to the third embodiment of the present invention. About the same part as Embodiment 1 and Embodiment 2, the same code | symbol is attached | subjected to the same part and the description is abbreviate | omitted.
The recording head 9 according to the third embodiment is configured such that the inclined angle s of the inclined discharge nozzle N (s) has a portion that gradually decreases from both end sides of the nozzle row 10 toward the center. Specifically, the inclination angle s1 of the two nozzles N from the extreme end is θ1−90 degrees, and the inclination angle s2 of the two inner nozzles N is θ2−90. Thus, the inclination angle s is configured to be small in two stages. Of course, the number of stages is not limited to two, but may be three or more.

  According to the present embodiment, the inclination angle s of the inclined discharge nozzle N (s) has a portion that gradually decreases from both end sides of the nozzle row 10 toward the center, so that the landing position deviation due to the radiation discharge phenomenon is effective. And can be easily manufactured.

◆◆◆ Embodiment 4 ◆◆◆
FIG. 9 is a schematic diagram illustrating the liquid ejection direction of each nozzle in each nozzle row in the overlapping portion of the nozzle rows according to the fourth embodiment of the present invention. About the common part with Embodiment 1- Embodiment 3, the same code | symbol is attached | subjected to the same part and the description is abbreviate | omitted.
In the recording head 9 according to the fourth embodiment, in the recording apparatus 1 illustrated in FIG. 2, the inclined discharge nozzles N (s) are provided in the overlap portion 30 at the ends of the two nozzle rows 10. Specifically, three nozzles at the end of the unit nozzle row 10 of the unit head 9a of the recording head 9 and the other unit head 9c are formed as inclined nozzles N (s), and the other nozzles have an inclination angle s of 0 degree. This is a normal nozzle N. The same applies to the overlap portions 30 of the other unit heads.
Regarding the amount of ink ejected from both nozzle rows 10 of the unit heads 9a and 9c of the overlap portion 30 toward the same landing position, the amount of ejection from both nozzles N (s) of the overlap portion 30 Is set to be the same as the amount of liquid ejected from the nozzle N in the portion where the sum does not overlap.

A plurality of unit heads 9a, 9b, 9c, 9d, and 9e are provided. The unit heads 9a, 9b, 9c, 9d, and 9e are arranged apart from each other in the first direction A, and each unit head 9a, 9b, 9c, In the structure in which the end portions of the unit nozzle arrays 10 of 9d and 9e are overlapped, a radiation discharge phenomenon occurs in the overlap portion 30.
According to the present embodiment, since the inclined discharge nozzle N (s) is provided in the overlap portion 30, each radiation discharge phenomenon of each nozzle row 10 in the overlap portion 30 can be suppressed. . As a result, it is possible to suppress the deterioration of the quality of the liquid ejection product due to the deviation of the liquid landing position.

◆◆◆ Embodiment 5 ◆◆◆
FIG. 10 is a schematic diagram illustrating the liquid ejection direction of each nozzle in each nozzle row in the overlapping portion of the nozzle rows according to the fifth embodiment of the present invention. About the common part with Embodiment 1-4, the same code | symbol is attached | subjected to the same part and the description is abbreviate | omitted.
In the recording head 9 according to the fifth embodiment, the inclined discharge nozzle N (s) of the unit head 9a in the overlap portion 30 is different in inclination angle s from the inclined discharge nozzle N (s) of the other unit head 9c. It is comprised so that it may have. In this embodiment, the inclined discharge nozzle N (s) of the unit head 9a has an inclination angle s1 of θ1-90 degrees, and the inclined discharge nozzle N (s) of the other unit head 9c has an inclination angle s2 of θ2-90 degrees. It is.

The degree of the radiation discharge phenomenon in the overlap portion 30 may be different between one nozzle row 10 and the other nozzle row 10.
According to the present embodiment, one of the inclined discharge nozzles N (s) of the overlap portion 30 has a different inclination angle s from the other inclined discharge nozzles N (s) (s1, s2). A case where the degree of the phenomenon is different between the one nozzle row 10 and the other nozzle row 10 can be dealt with.

◆◆◆ Embodiment 6 ◆◆◆
FIG. 11 is a schematic diagram illustrating the liquid ejection direction of each nozzle in each nozzle row in the overlapping portion of the nozzle rows according to the sixth embodiment of the present invention. About the common part with Embodiment 1-5, the same code | symbol is attached | subjected to the same part and the description is abbreviate | omitted.
In the sixth embodiment, the control unit 13 of the recording apparatus 1 includes the inclined discharge nozzle N (s) provided on one of the overlap portions 30, and the overlap portion 30 for discharging ink from the overlap portion 30. Among these, a control mode is provided in which discharge is not performed from the inclined discharge nozzle N (s), and discharge is performed from other nozzles N that are not inclined. That is, the inclined discharge nozzle N (s) is provided in the unit head 9a, and the inclined discharge nozzle N (s) is not provided in the other unit head 9c, and only the normal nozzle N is provided.

According to the present embodiment, the inclined discharge nozzle N (s) is provided on one of the overlap portions 30, and further, the inclined discharge nozzle N (s) of the overlap portion 30 is discharged with respect to the ink discharge of the overlap portion 30. There is a control mode in which discharge is not performed from the other nozzle N and discharge is performed from another nozzle N that is not inclined. Therefore, when the distance from the recording medium P is small and the influence of the radiation ejection phenomenon is small, the inclined ejection nozzle N (s) is not used, and only the other normal nozzles N that are not inclined are used. It becomes possible to perform discharge.
In this control mode, the amount of ink ejected from the nozzle N that is not inclined in the overlap portion 30 is the same as the amount of ink ejected from the nozzle N in the portion that does not overlap.
On the other hand, when the distance from the recording medium P becomes large and the influence of the landing position deviation due to the radiation ejection phenomenon becomes obvious, the inclined ejection nozzle N (s) provided on one side of the overlap portion 30 is also used for radiation. By suppressing the discharge phenomenon, it is possible to suppress the deviation of the landing position.

◆◆◆ Embodiment 7 ◆◆◆
The recording apparatus 1 according to the seventh embodiment is a recording apparatus in which ink is ejected with the interval between the nozzle surface F of the recording head 9 and the recording medium P set to 2.5 mm or more. When the recording medium P is a fabric, recording is often performed with such a large interval. This is because there are many fabrics having fluff on the surface. As described above, when the interval is increased, the influence of the radiation discharge phenomenon is likely to be manifested.
The recording apparatus 1 of this aspect has a large effect in a recording apparatus dedicated to textile printing, for example, having such a large distance from the recording medium P.

The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the invention described in the claims, and it goes without saying that these are also included in the scope of the present invention.
In the above description, the influence on the execution of printing when the interval by the recording head 9 having the inclined discharge nozzle N (s) is small is not described, but it can be said that the influence is basically small. In the liquid discharge direction 27 of the inclined discharge nozzle N (s), the landing position is slightly deviated from the original position due to the inclination s. However, since the interval is small, the deviation is small, and the influence of the inclination s is almost obvious. It can be to the extent that it does not.

  In the above embodiment, the inclined discharge nozzle N (s) has been described as being provided in the overlap portion 30. However, the inclined discharge nozzle N (s) overlaps other than the overlap portion 30. You may provide with respect to the nozzle N of the part which is not.

The present invention has been described in detail above based on specific embodiments. Here, the present invention will be described once more collectively.
The liquid discharge head according to the first aspect of the present invention is a liquid discharge head 9 having a nozzle row 10 in which a plurality of nozzles N for discharging liquid are arranged in the first direction A, and the nozzle at the center of the nozzle row 10 When the discharge direction 27 of N (c) is the reference direction, the inclined discharge nozzles N (s) having the discharge direction 27 at both ends of the nozzle row 10 are directions different from the reference direction and approaching the reference direction. It is characterized by providing.

  According to this aspect, since the inclined discharge nozzles N (s) are provided at both ends of the nozzle row 10 of the liquid discharge head 9, it is possible to suppress the radiation discharge phenomenon by the inclined discharge nozzles N (s). is there. Thereby, even if the space | interval with the medium P which opposes the nozzle surface F of the liquid discharge head 9 becomes large, the fall of the quality of the liquid discharge product by the shift | offset | difference of the landing position of a liquid can be suppressed.

The liquid ejection head according to the second aspect of the present invention is the liquid ejection head according to the first aspect, wherein the plurality of nozzles in a part of the inner side from both endmost nozzles of the nozzle row 10 are inclined ejection nozzles N (s). Features.
According to this aspect, since a plurality of nozzles inside the both endmost nozzles of the nozzle row 10 are inclined discharge nozzles N (s), manufacturing is easy and the radiation discharge phenomenon can be effectively suppressed.

The liquid ejection head according to a third aspect of the present invention is characterized in that, in the second aspect, the ratio of the inclined ejection nozzles is 10% or less of the total number of nozzles forming the nozzle row.
According to this aspect, since the ratio of the inclined discharge nozzles N (s) is 10% or less of the total number of nozzles forming the nozzle row 10, it is easy to manufacture and effectively suppress the radiation discharge phenomenon. it can.

In the liquid ejection head according to the fourth aspect of the present invention, in the second aspect or the third aspect, the inclination angle s of the inclined discharge nozzle N (s) is gradually increased from both end sides of the nozzle row 10 toward the center. It is characterized by becoming smaller.
According to this aspect, the inclination angle s of the inclined discharge nozzle N (s) gradually decreases from both end sides of the nozzle row 10 toward the center, so that the landing position deviation due to the radiation discharge phenomenon can be more effectively suppressed. Can do.

In the liquid ejection head according to the fifth aspect of the present invention, in the second aspect or the third aspect, the inclination angle s of the inclined discharge nozzle N (s) is stepped from both end sides of the nozzle row 10 toward the center. It has the part which becomes small automatically.
According to this aspect, since the inclination angle s of the inclined discharge nozzle N (s) has a portion that gradually decreases from both ends of the nozzle row 10 toward the center, the landing position deviation due to the radiation discharge phenomenon is effective. And can be easily manufactured.

The liquid ejection apparatus according to the sixth aspect of the present invention includes a liquid ejection head 9 having a nozzle row 10 in which a plurality of nozzles N that eject liquid are arranged in the first direction A, and the liquid ejection head 9 and the medium P The liquid discharge apparatus 1 discharges liquid onto the medium P by relative movement, and the liquid discharge head 9 is the liquid discharge head described in any one of the first to fifth aspects. It is characterized by being.
According to this aspect, since the inclined discharge nozzles N (s) are provided at both ends of the nozzle row 10 of the liquid discharge head 9, it is possible to suppress the radiation discharge phenomenon by the inclined discharge nozzles N (s). Is possible. As a result, it is possible to suppress the deterioration of the quality of the liquid ejection product due to the deviation of the liquid landing position.

  According to a seventh aspect of the liquid ejection apparatus of the present invention, in the sixth aspect, the transport unit 2 that intermittently transports the medium P in the first direction A and the liquid ejection head 9 are attached, and the relative discharge in the intermittent transport is performed. And a carriage 5 that moves in a second direction B that intersects the first direction A when the movement is stopped, and the nozzle surface F of the liquid discharge head 9 protrudes toward the medium P from the adjacent periphery. To do.

In the structure in which the nozzle surface F of the liquid discharge head 9 protrudes from the adjacent periphery to the medium P side, the radiation discharge phenomenon is easily promoted by the influence of the air flow accompanying the movement of the carriage 5.
According to this aspect, even in such a protruding structure, it is possible to suppress the radiation discharge phenomenon by the inclined discharge nozzle N (s), so that the quality of the liquid discharge product is deteriorated due to the deviation of the liquid landing position. Can be suppressed.

  According to an eighth aspect of the liquid ejection apparatus of the present invention, in the sixth aspect or the seventh aspect, the liquid ejection head 9 includes a plurality of unit heads 9a, 9b, 9c, 9d, and 9e. 9a, 9b, 9c, 9d, 9e are arranged apart from each other in the first direction A, and the unit nozzle rows 10 of the unit heads 9a, 9b, 9c, 9d, 9e are arranged with their end portions overlapping. It is characterized by being.

A plurality of unit heads 9a, 9b, 9c, 9d, and 9e are provided. The unit heads 9a, 9b, 9c, 9d, and 9e are arranged apart from each other in the first direction A, and each unit head 9a, 9b, 9c, In the structure where the end portions of the unit nozzle rows 10 of 9d and 9e are overlapped, the radiation discharge phenomenon is likely to occur in the overlap portion 30.
According to this aspect, even in such a nozzle overlap structure with a plurality of heads, it is possible to suppress the radiation discharge phenomenon by the inclined discharge nozzle N (s). A decrease in the quality of the discharged product can be suppressed.

The liquid ejection apparatus according to the ninth aspect of the present invention is characterized in that, in the eighth aspect, the inclined ejection nozzle N (s) is provided in the overlap portion 30.
According to this aspect, since the inclined discharge nozzle N (s) is provided in the overlap portion 30, each radiation discharge phenomenon of each nozzle row 10 in the overlap portion 30 can be suppressed. As a result, it is possible to suppress the deterioration of the quality of the liquid ejection product due to the deviation of the liquid landing position.

  According to a tenth aspect of the liquid discharge apparatus of the present invention, in the ninth aspect, one inclined discharge nozzle N (s) of the overlap portion 30 has an inclination angle s that is the same as that of the other inclined discharge nozzle N (s). It is characterized by having different things.

The degree of the radiation discharge phenomenon in the overlap portion 30 may be different between one nozzle row 10 and the other nozzle row 10.
According to this aspect, since one inclined discharge nozzle N (s) of the overlap portion 30 has a different inclination angle s from the other inclined discharge nozzle N (s), the degree of the radiation discharge phenomenon is one of them. A case where the nozzle row 10 and the other nozzle row 10 are different can be dealt with.

  According to an eleventh aspect of the liquid ejection apparatus of the present invention, in the eighth aspect, the inclined ejection nozzle N (s) is provided on one side of the overlap portion 30, and the liquid ejection of the overlap portion 30 In the overlap portion 30, there is provided a control mode in which discharge is not performed from the inclined discharge nozzle N (s) and discharge is performed from other nozzles N that are not inclined.

According to this aspect, the inclined discharge nozzle N (s) is provided on one of the overlap portions 30, and the liquid discharge of the overlap portion 30 is further performed from the inclined discharge nozzle N (s) in the overlap portion 30. Is provided, and a control mode is provided in which discharge is performed from another nozzle N that is not inclined. Accordingly, when the distance from the medium P is small and the influence of the radiation discharge phenomenon is small, the liquid discharge is performed using only the other normal nozzles N which are not inclined without using the inclined discharge nozzles N (s). It becomes possible to do.
In this control mode, the amount of liquid ejected from the nozzle N that is not inclined in the overlap portion 30 is the same as the amount of liquid ejected from the nozzle N in the non-overlap portion.
On the other hand, when the distance from the medium P becomes large and the effect of landing position deviation due to the radiation ejection phenomenon becomes obvious, the radiation ejection is also performed using the inclined ejection nozzle N (s) provided on one side of the overlap portion 30. By suppressing the phenomenon, it is possible to suppress the deviation of the landing position.

In a liquid ejection device according to a twelfth aspect of the present invention, in any one of the sixth aspect to the eleventh aspect, the liquid ejection apparatus includes a nozzle surface F of the liquid ejection head 9 and the medium P. The interval is set to 2.5 mm or more, and the liquid is ejected.
In the liquid ejecting apparatus having such a large distance from the medium P as in this aspect, the effect obtained is great.

1 recording device, 2 adhesive belt (conveyance unit), 3 conveyance roller,
4 driven roller, 5 carriage, 6 input / output section, 7 driven roller,
8 winding part, 9 recording head (liquid discharge head),
9a, 9b, 9c, 9d, 9e Unit head, 10 nozzle row (unit nozzle row),
11 PC, 13 control unit, 14 CPU, 15 system bus,
16 ROM (storage unit), 17 RAM, 18 head drive unit,
19 motor drive unit, 20 carriage motor, 21 transport motor,
22 winding motor, 25 nozzle row, 26 base surface, 27 nozzle discharge direction,
28 Ink flight direction, 30 overlap part, F nozzle surface,
N nozzle, N (c) center nozzle, N (s) inclined discharge nozzle,
P Recording medium, s Tilt angle

Claims (12)

A liquid discharge head having a nozzle row in which a plurality of nozzles for discharging liquid are arranged in the first direction,
Inclining discharge nozzles having a discharge direction in a direction different from the reference direction and approaching the reference direction at both ends of the nozzle row when the discharge direction of the nozzle in the center of the nozzle row is a reference direction A liquid discharge head characterized by the above. The liquid discharge head according to claim 1,
2. A liquid discharge head according to claim 1, wherein a plurality of nozzles in a part of the inner side from both endmost nozzles of the nozzle row are the inclined discharge nozzles. The liquid discharge head according to claim 2,
The ratio of the inclined discharge nozzles is 10% or less of the total number of nozzles forming the nozzle row, wherein the liquid discharge head is characterized in that The liquid discharge head according to claim 2 or 3,
The liquid discharge head according to claim 1, wherein an inclination angle of the inclined discharge nozzle gradually decreases from both end sides of the nozzle row toward the center. The liquid discharge head according to claim 2 or 3,
The liquid discharge head according to claim 1, wherein an inclination angle of the inclined discharge nozzle has a portion that gradually decreases from both ends of the nozzle row toward the center. A liquid ejection head having a nozzle row in which a plurality of nozzles that eject liquid are arranged in the first direction;
A liquid ejection apparatus that ejects liquid onto the medium by relatively moving the liquid ejection head and the medium,
The liquid discharge apparatus according to claim 1, wherein the liquid discharge head is the liquid discharge head according to claim 1. The liquid ejection apparatus according to claim 6, wherein
A transport unit that intermittently transports the medium in the first direction;
A carriage that is mounted with the liquid ejection head and moves in a second direction that intersects the first direction when the relative movement is stopped in the intermittent conveyance;
The liquid discharge apparatus according to claim 1, wherein the nozzle surface of the liquid discharge head protrudes toward the medium side from an adjacent periphery. The liquid ejection device according to claim 6 or 7,
The liquid discharge head includes a plurality of unit heads,
Each unit head is spaced apart in the first direction,
Each unit nozzle row of each unit head is disposed so that the end portions overlap each other, and the liquid ejection apparatus is characterized in that The liquid ejection apparatus according to claim 8, wherein
The liquid ejection apparatus, wherein the inclined ejection nozzle is provided in the overlap portion. The liquid ejection apparatus according to claim 9, wherein
One of the inclined discharge nozzles in the overlap portion has a different inclination angle from the other inclined discharge nozzle. The liquid ejection apparatus according to claim 8, wherein
The inclined discharge nozzle is provided on one of the overlap portions,
About discharge of the liquid of the above-mentioned overlap part, it is characterized by having control mode which does not discharge from the above-mentioned inclined discharge nozzle among the above-mentioned overlap parts, and discharges from other nozzles which are not inclined. Liquid ejection device. The liquid ejection device according to any one of claims 6 to 11,
The liquid ejecting apparatus is characterized in that the liquid is ejected with the distance between the nozzle surface of the liquid ejecting head and the medium set to 2.5 mm or more.

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