JP2010075905A - Inkjet coater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight and compact inkjet head unit that has high precision of alignment and includes an alignment-adjusting mechanism enabling easy adjustment from the outside, and an inkjet printer equipped with the inkjet head unit. <P>SOLUTION: The inkjet coater includes the inkjet head unit having at least one inkjet head, a mechanism for adjusting the position of the inkjet head along the direction X perpendicular to the scanning direction Y, a rotation control mechanism for rotating the inkjet head unit around a rotary shaft in the direction Z and a detecting means for detecting the position of nozzles at both ends of the inkjet head. The inkjet coater has the rotary shaft around which the inkjet head unit rotates positioned near the endmost nozzle along the direction X among a plurality of nozzles of the inkjet head. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ink jet coating apparatus for producing a printed matter formed by coating an ink film, and more particularly to position adjustment of an ink jet head for changing the pitch of ink ejection.

As a method for producing a color filter, a method of patterning a photosensitive colored resin by a photolithography method is known. The method of manufacturing a color filter by photolithography is to form a coating film of a photosensitive resin layer of each color on the entire substrate, and after exposing the pattern, unnecessary portions of the coating film are removed by development, and the remaining pattern is removed from each pixel. And In this method, a large amount of material is wasted because most of the coating film is developed and removed. Furthermore, since the exposure and development processes are repeated for each color, the number of processes increases.
However, on the other hand, the substrate size of the color filter is increasing year by year. In order to reduce the cost of the color filter, the pigment dispersion method that repeats the photolithography process for each color is wasteful, and in recent years, a method using an ink jet has been studied.

The inkjet coating apparatus includes an inkjet head unit including one or a plurality of inkjet heads. The inkjet head has a large number of nozzles aligned. The ink jet coating apparatus performs printing by ejecting ink from these many nozzles.
In the ink jet coating apparatus, the ink jet head unit and the substrate mounting table are relatively moved along the surface of the substrate mounting table to discharge the substrate placed on the substrate mounting table. Along with the increase in size of the substrate, the inkjet head unit is provided with a plurality of inkjet heads arranged in an array, and discharge pattern information is created so that the discharge liquid amount is uniform, and ink discharge is performed based on this information. (Patent Document 1).

In an inkjet coating apparatus, it is required to control the nozzle with high positional accuracy during printing. This is because if the nozzle positions between the inkjet heads are not accurate, gaps are formed between the inkjet heads or dots overlap. When such a phenomenon occurs, it causes defects such as streaky omission, unevenness, and color mixing. For this reason, when arranging the nozzles, the nozzle surfaces of the plurality of inkjet heads are horizontal and the same height as viewed from the substrate position, and no gaps or dots overlap between the inkjet heads. It was adjusted as follows. Such adjustment is important because the movable range of the inkjet head becomes wider and the landing error becomes larger as the substrate becomes larger.
In order to prevent the occurrence of defects such as streak-out, unevenness, and color mixing, there is a method to measure the landing position of ink dots ejected from the nozzle and landed on the substrate, and to adjust the deviation amount of that position for each nozzle Known (Patent Documents 2, 3 and 4).

Also, if the inkjet head unit is lengthened, a large number of nozzles will be used. If the position of the nozzle is adjusted one by one outside the operation time of the inkjet coating device, the length of the adjustment will be increased (throughput improvement). Can be absorbed.
For this reason, it was preferable that the mutual position adjustment of the ink jet head be performed in a short time.
However, according to the method described in Patent Document 4, it is necessary to perform landing error measurement and head alignment adjustment separately from the normal ejection process, and thus the productivity is reduced by the adjustment time. was there.

Further, in the ink jet coating apparatus, the ink jet head may be able to be matched by rotating the ink jet head by a predetermined angle when the pixel pitch interval does not coincide with the nozzle pitch interval in the direction orthogonal to the scanning direction. . An ink jet coating apparatus including a mechanism for rotating an ink jet head is disclosed in Patent Document 5. However, according to this method, since the rotation axis is in the vicinity of the center of the inkjet head unit, if two detection means such as an image sensor are installed at both ends of the inkjet head and an attempt is made to correct the rotational deviation of the inkjet head, the inkjet Of the both ends of the head, one end and another end move in different directions with respect to the detecting means (FIGS. 7A and 7B). For this reason, it is necessary to repeatedly adjust the rotation direction and the X direction. In addition, if both ends deviate from the detection range of the detection means during rotation by a predetermined angle, there arises a problem that it takes extra time to adjust the rotation direction in the ink jet direction (in the state of FIG. 7C, the adjustment is performed again). Required).

In addition, since the alignment mechanism requires a large number of axes in the X, θ, and Z directions, the alignment mechanism cannot be made compact by using a conventional fine adjustment mechanism that combines a fine movement stage and a micrometer head. And the dimension of an inkjet head unit will increase, As a result, an inkjet coating apparatus will enlarge.
However, when an ink jet coating apparatus is used for manufacturing an optical element such as a color filter, very high adjustment accuracy is required. For this reason, it has been required to make the ink jet head unit as light and compact as possible and to improve the movement accuracy.

Regarding the problem of increasing the weight and size of the inkjet head unit, Patent Document 6 discloses an inkjet coating apparatus in which the adjustment mechanism for the rotation direction of the inkjet head and the position (X direction) of the nozzle head is compact and easy to adjust. ing.
However, this method requires manual adjustment, and as the size of the device increases with the increase in the size of the substrate to be coated, the adjustment itself is dangerous for the operator to adjust in the device. There is also a problem that is difficult. For this reason, it is necessary for the operator to be able to easily adjust from the outside without approaching the movable part of the apparatus. To that end, it is required that the adjusting mechanism is light in weight and can be mounted compactly in the head unit. .
Japanese Patent Laid-Open No. 9-101212 Japanese Patent Laid-Open No. 9-277571 JP-A-10-332924 Japanese Patent Laid-Open No. 11-2711 Japanese Patent Laid-Open No. 11-64626 JP 2007-244941 A

  An alignment device that rotates and moves the inkjet head to align the ejection positions of a large number of nozzles with the ejection area of the substrate to be printed is large and heavy. There was a problem of not. Accordingly, the present invention has an object to develop an inkjet head unit including an alignment adjustment mechanism that is lightweight and compact, has high rotation and positional alignment accuracy, and can be easily adjusted from the outside at once, and an inkjet printing apparatus including the same. It was.

The invention according to claim 1 for solving the above-described problem is at least:
(A) an inkjet head unit including one or more inkjet heads formed by arranging a plurality of nozzles in a specific direction;
(B) a mechanism for adjusting the position of the inkjet head along the X direction orthogonal to the scanning direction Y of the inkjet head unit;
(C) a rotation adjustment mechanism that rotates the inkjet head unit about a Z-axis direction orthogonal to a surface formed from the X direction and the scanning direction Y of the inkjet head;
(D) In an inkjet coating apparatus comprising: a detecting unit that detects positions of nozzles at both ends of the inkjet head;
The ink jet coating apparatus is characterized in that the position of the axial center around which the ink jet head unit rotates is arranged in the vicinity of the nozzle existing at the end along the X direction among the plurality of nozzles of the ink jet head. Is.

  According to a second aspect of the present invention, the straight line parallel to the scanning direction passing through the nozzle a existing at the end along the X direction among the plurality of nozzles of the inkjet head is L, and the straight line parallel to the straight line L is the straight line. If the line segment existing in the inkjet head unit is L ′, the position of the axis center where the inkjet head unit rotates is the maximum distance between L ′ and the nozzle a being 1 in the X direction length of the inkjet head. The inkjet coating apparatus according to claim 1, wherein the inkjet coating apparatus is disposed on a straight line segment L ′ that is equal to or less than / 3.

  According to a third aspect of the present invention, the position of the axial center is arranged in a region on the side where the nozzle is extended in the X direction among the two regions separated by the straight line L in the inkjet head unit. The inkjet coating apparatus according to claim 1 or 2, wherein

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the X-direction adjusting mechanism is a mechanism that reciprocates the inkjet head unit by a predetermined section using an eccentric cam. Inkjet coating apparatus.

  The invention according to claim 5 is an ink jet coating apparatus in which the eccentric cam according to claim 4 has a half-moon shape and is driven by a stepping motor through a worm gear.

  The invention according to claim 6 is the mechanism according to any one of claims 1 to 3, wherein the rotation adjusting mechanism is a mechanism for reciprocating the inkjet head unit by a predetermined section using an eccentric cam. Inkjet coating apparatus.

  A seventh aspect of the present invention is an ink jet coating apparatus in which the eccentric cam according to the sixth aspect has a half-moon shape and is driven by a stepping motor via a worm gear. .

  The invention according to claim 8 is the ink jet coating apparatus according to any one of claims 1 to 4, wherein the ink jet head unit includes a gap adjusting mechanism that corrects an inclination in the Z-axis direction. It is what.

  The invention according to claim 9 is characterized in that the gap adjusting mechanism according to claim 8 is a mechanism for moving the inkjet head unit up and down in the Z-axis direction by at least one adjusting screw. The inkjet coating apparatus according to any one of the above items.

  The invention according to claim 10 is characterized in that the ink jet head is attached in the Z direction from below the X direction adjustment mechanism and the rotation direction adjustment mechanism. Inkjet coating apparatus.

According to the first invention, the axis of the rotation axis of the inkjet head is arranged in the vicinity of the nozzle existing at the end along the X direction among the many nozzles of the inkjet head.
With such an arrangement, it is not necessary to repeat the rotation direction and the X direction as compared with the prior art when correcting the rotational deviation of the inkjet head, and thus it was possible to carry out with a simple process (FIG. 8). .
For this reason, the mutual relationship and nozzle gap of the inkjet head could be adjusted more efficiently and accurately than before. Furthermore, there was no need to perform trial coating on the coated substrate or measurement of coating accuracy, and productivity could be improved. Instead of measuring the position of the coated droplets, adjustment is made by looking at the nozzle position, so that trial coating is not necessary.

Further, according to the second invention, the axis of the rotating shaft 84 of the inkjet head is arranged in the shaded area shown in FIG. 9A in the inkjet head unit area. Here, a is the nozzle that is present at the end of the many nozzles 83 arranged. In the figure, x is the length of the inkjet head. The shaded area occupies an area from the straight line L to (1/3) x.
By disposing the rotation shaft at such a position, the amount of movement of the nozzle a in the scanning direction (Y direction) is sufficiently within the allowable range of alignment when correcting the rotational deviation of the inkjet head. For this reason, since it is not necessary to repeat a rotation direction and a X direction, the position of both ends could be adjusted by a simple process (FIG. 8).

  According to the third invention, when the rotational deviation of the inkjet head is rotated and corrected along this axis, one end and the other end of both ends of the inkjet head move in the same direction, In addition, since the end portion closer to the rotation axis hardly moves, it is not necessary to separately operate the detection means corresponding to the end portion of the inkjet head. Therefore, when correcting the rotational deviation of the inkjet head, the positions of both ends can be adjusted by a simpler process than before.

  According to the fourth aspect of the invention, the use of the eccentric cam can make the position adjustment mechanism of the ink jet head compact and reduce the weight, so that the weight of the ink jet head unit can be moved on the X axis. I was able to.

According to the fifth invention, the eccentric cam of the X-direction adjusting mechanism has a half-moon shape and is driven by the stepping motor via the worm gear. If it is such a mechanism,
As shown in FIG. 6 (a), the eccentric cam pushes the moving piece against the spring force up to the top of the eccentric cam. The eccentric cam is rotated in the direction of rotation by the amount of backlash (the gap between the tooth profile of the worm and the worm wheel). As a result, it has been found that the operation and positioning become unstable when the eccentric cam and the moving piece contact each other in the vicinity of the apex.
In order to prevent this, an unstable part could be avoided by making the eccentric cam half-moon and bringing the straight part into contact with the moving piece without reaching the apex.
A stepping motor is used as a drive source so that the mechanism is not damaged at the time of contact. The stepping motor has a torque setting that can rotate the eccentric cam and does not damage the mechanism. As a result, the stroke end detecting means is not required and the weight can be further reduced.
In addition, since it is electrically operated, the operator can adjust by remote control while avoiding dangerous moving parts in a device for handling a large substrate.

  According to the sixth aspect of the invention, the rotation adjustment mechanism that corrects the deviation in the rotation direction of the inkjet head is a mechanism that reciprocates the inkjet head unit by a predetermined section using an eccentric cam. With this configuration using the eccentric cam, the position adjustment mechanism of the ink jet head can be made compact, and the weight of the ink jet head unit can be moved on the X axis.

According to a seventh aspect of the invention, the eccentric cam of the rotational direction adjusting mechanism has a half-moon shape and is driven by a stepping motor via a worm gear. When the eccentric cam is circular, as shown in FIG. 6 (a), the eccentric cam pushes the moving piece against the spring force up to the top of the eccentric cam. The moving piece rotates the eccentric cam in the rotational direction by the amount of backlash of the worm gear (the gap between the teeth of the worm (41, 48) and the worm wheel (65)).
As a result, it has been found that when the eccentric cam and the moving piece come into contact with each other in the vicinity of the apex, the operation and positioning become unstable.
In order to prevent this, as shown in FIG. 6 (b), the eccentric cam has a half-moon shape, and the straight portions (71, 72) are brought into contact with the moving piece (73) without reaching the apex. I was able to avoid.
Stepping motors (40, 47) are used as drive sources so that the mechanism is not damaged at the time of contact. The stepping motor has a torque setting that can rotate the eccentric cam and does not damage the mechanism. As a result, the stroke end detecting means is not required and the weight can be further reduced.
Further, as in the X direction, the operator can now adjust by remote control while avoiding dangerous moving parts.

  According to the eighth aspect of the invention, the ink jet coating apparatus further includes a gap adjusting mechanism that corrects the inclination of the ink jet head in the Z-axis direction. Thereby, it was possible to prevent variations in the landing positions due to the inclination of the inkjet head.

  According to the ninth invention, at least one correction screw is used for correcting the inclination in the Z-axis direction. As a result, the subtle inclination of the inkjet head could be corrected with high accuracy.

  According to a tenth aspect of the invention, the inkjet head is attached from below the X direction adjustment mechanism and the rotation direction adjustment mechanism. In a head unit in which a large number of inkjet heads are arranged, ink tubes and ejection control wirings are densely arranged above the inkjet head. When the ink jet head is replaced, the damaged head can be detached on the lower side, and the replacement workability can be improved.

Hereinafter, the inkjet coating apparatus of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall view showing a configuration of an inkjet coating apparatus and accessory equipment according to an embodiment of the present invention. The inkjet coating apparatus includes a coating substrate transport stage 2, an inkjet head unit 14, an inkjet head unit moving shaft 4, a main controller 10, and a discharge controller 9.
A substrate to be coated is mounted on the coated substrate conveyance stage 2. Examples of the base material include base materials that require fine pattern formation, such as color filters, organic electroluminescent elements, wiring circuit boards, and biochips.

Hereinafter, a case where a color filter is formed will be described as an example. The substrate transport stage 2 moves along a predetermined substrate transport stage transport direction 11 (hereinafter also referred to as Y direction or scanning direction). The inkjet head unit 14 moves on the inkjet head unit moving shaft 4. The inkjet head unit moving shaft 4 is orthogonal to the scanning direction 11 of the inkjet head unit. The direction parallel to this axis is taken as the X direction.
The coating substrate transport stage 2 includes a vacuum suction hole for fixing the coating substrate 1. The substrate can be fixed without protruding from the surface of the substrate. As a result, the gap between the coated substrate 1 and the inkjet head 13 can be brought to a minimum.
The discharge control unit 9 includes a storage unit (not shown) that stores measurement values of position coordinates of the locus of movement of the inkjet head unit.
As a result, the linearity at a desired position on the X axis of the inkjet head unit can be grasped. Even if the inkjet head unit 14 is not a straight line with respect to the X axis at a desired position, the linearity (deviation) at that position is known from the already measured position coordinates, so the nozzle ejection timing is changed accordingly. Thus, the coating accuracy can be corrected.

FIG. 2 shows details of the inkjet head unit 14 and its peripheral mechanism diagram.
The inkjet head unit 14 includes a plurality of inkjet heads (13). The inkjet head includes a plurality of nozzles that eject ink. The ink jet heads must be arranged in a predetermined direction so that the nozzles have a predetermined interval. Deviation of the arrangement direction of the ink jet heads from a predetermined direction is referred to as rotational deviation of the ink jet heads. For this reason, the inkjet coating apparatus includes a θ adjustment mechanism 15 for correcting a shift in the rotation direction (hereinafter also referred to as the θ direction). Even if the inkjet head unit includes a plurality of inkjet heads, the overall direction of the plurality of inkjet heads can be adjusted by the θ adjustment mechanism 15.
However, when using a plurality of inkjet heads, the orientation of each inkjet head must be further finely adjusted.
FIG. 1 shows two detection means (inverted microscope 7) for detecting the rotational deviation of the inkjet head. Specifically, one of the detection means is installed so as to detect the nozzle at the end of the ink jet head (FIG. 7A). Then, the inkjet head is rotated about the rotation axis by a rotation adjusting mechanism (not shown). As a result, the end of the inkjet head may deviate from the detection range of the detection means (FIG. 7B). In that case, the inkjet head is moved in the scanning direction, and the end of the inkjet head is detected again by the detection means. Then readjust the rotation angle. This operation is repeated, and adjustment is performed so that the end of the inkjet head is finally detected by both of the two detection means (FIG. 7C). By performing the above operation on each ink jet head, the correction of the rotational deviation is completed.
In the present invention, since the rotation shaft is disposed at a position corresponding to the end of the ink jet head (FIG. 8A), the adjustment process can be completed at once (FIG. 8B). .
Further, the inkjet head may be tilted, and a deviation in the Z-axis direction 17 (vertical direction) may occur. In order to correct this inclination in the Z-axis direction, a gap adjusting mechanism (not shown) can be provided.

FIG. 3 is a plan view showing an example of the arrangement of each inkjet head in an inkjet head unit including a plurality of inkjet heads.
The inkjet head 13 is arranged in parallel to a direction orthogonal to the substrate transport direction.
Further, since the width of the ink jet head main body is wider than the nozzle range, adjacent ink jet heads are arranged in a staggered manner shifted in the substrate transport direction. For this reason, ink ejection can be made linear by changing the ejection timing of the nozzles belonging to the inkjet head according to the distance in the Y direction generated between the inkjet head and the adjacent inkjet head.

FIG. 5 is a perspective view of the alignment (position adjustment) mechanism of the inkjet head of the present invention. In FIG. 4, two inkjet heads (13a, 13b) are shown. This is an example of an arrangement for performing coating at twice the resolution by arranging two inkjet heads as compared with a case where one inkjet head (13) is provided.
For this reason, the mutual inkjet heads are arranged so as to be shifted by 1/2 of the nozzle pitch in the X direction, arranged so that the nozzle arrangement directions are parallel, and arranged with the same nozzle surface height. The inkjet head alignment mechanism described below is a method for adjusting the positions of the two inkjet heads at the same time, and the positions of the two inkjet heads are already adjusted and fixed. . However, the present invention is not limited to such a configuration, and one alignment mechanism is made to correspond to one ink-jet head, and more than two ink-jet heads are supported and controlled by one alignment mechanism. It is also possible to make it. This alignment mechanism includes an inkjet head mounting portion 21 and an adjustment stage 22.

In the adjustment stage, a Z base (33) provided with jack bolts (37a to 37d) for adjusting the Z direction, the inclination in the X direction and the inclination in the scanning direction (Y direction) is provided on the inkjet head base plate (19). It is fixed. The X base (34) is disposed below the Z base and includes a linear guide (36) for moving in the X direction. The adjustment in the X direction is performed when the X axis eccentric cam (42) of the X axis eccentric cam unit fixed to the Z base displaces the X axis moving piece (44). The X-axis eccentric cam of the X-axis eccentric cam unit has a half-moon shape and moves the straight part (71, 72) in the X-axis without reaching top dead center (69) or bottom dead center (68). By abutting against the piece, unstable parts at both points can be avoided. Further, by using the stepping motor (40) as the drive motor, even if the straight portion of the X-axis eccentric cam contacts the moving piece, the motor will only step out and the device will not be damaged.
The θ base (51) is provided with a rotation shaft (45) for rotating in the rotation direction (46), and a vertically moving press-slip bearing (three places). The rotation direction is adjusted when the θ-axis eccentric cam (49) of the θ-axis eccentric cam unit fixed to the X base displaces the θ-axis moving piece (50). The θ-axis eccentric cam of the θ-axis eccentric cam unit, like the X-axis eccentric cam unit, has a half-moon shape and hits the straight part against the moving piece without reaching top dead center or bottom dead center. By making contact, unstable parts at both points can be avoided. Further, by using the stepping motor (47) as the drive motor, even if the straight portion of the θ-axis eccentric cam contacts the moving piece, the motor will only step out and the device will not be damaged.

FIG. 5 is a perspective view of the ink jet head mounting portion.
Here, a case where two inkjet heads whose mutual positions are adjusted and fixed is used is shown.
The inkjet head has an assembly jig (not shown) such that the nozzle position and the wing mounting surface are within the permissible ranges in the X direction / rotation direction and the Z direction (17) on the wings (61, 62). It is assembled and fixed in advance using
Thereby, the nozzle position can be set within the adjustment range of the adjustment stage in both the X direction and the rotation direction. Further, the adjustment after the attachment of the ink jet head is not required in the Z direction, and the adjustment can be performed easily and quickly.
In addition, because of the detachment from the lower side, the inkjet head can be replaced without being obstructed by the wiring / pipe above the inkjet head.

By these, the X direction and rotation direction adjustment of the inkjet head attached to the inkjet head attachment part can be performed.
Here, by arranging the rotation shaft 84 in the vicinity of the X position of the outermost nozzle of the inkjet head nozzle row, the positions of both ends are adjusted during the adjustment for correcting the rotational deviation of the inkjet head (the adjustment in the θ direction). Adjustment could be performed by a simpler process than before. That is, by adjusting the θ direction of the inkjet head to minimize the deviation of the Y direction position of the inkjet end nozzle, the θ direction adjustment can be achieved if only the nozzle at the other end of the inkjet head is detected by an inverted microscope. You can do it.
Further, the adjustment stage has jack bolts (37a to 37d) for adjusting the height in the Z direction.
) And fixing screws. Here, the height detection means may be a laser displacement meter (not shown) or the focus position adjustment of an inverted microscope. Thereby, the difference between the height of the inkjet head and the left and right heights of the nozzle row can be adjusted and fixed so as to be minimized.

1 is an overall view of an inkjet coating apparatus according to an embodiment of the present invention. It is an inkjet head unit of this invention and its periphery mechanism figure. It is a figure of the planar view which shows the arrangement | sequence of the inkjet head in the inkjet head unit of this invention. It is a perspective view of the alignment (position adjustment) mechanism part of the inkjet head of this invention. It is a perspective view of the alignment (position adjustment) mechanism part of the inkjet head of this invention. It is a partial perspective view of the alignment (position adjustment) mechanism part of the inkjet head of this invention, and operation | movement explanatory drawing of an eccentric cam. This is a conventional inkjet head unit. It is an inkjet head unit of the present invention. It is an inkjet head unit of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Coating base material 2 ... Base material conveyance stage 3 ... Maintenance station 4 ... Inkjet head unit movement axis (X axis)
DESCRIPTION OF SYMBOLS 5 ... Linear scale 6 ... Inkjet head unit movement base 7 ... Inverted microscope 8 ... Conveyance stage control part 9 ... Discharge control part 10 ... Main controller 11 ... Base material conveyance stage conveyance direction (Y direction)
12 ... Inkjet head unit moving direction (X direction)
13 ... Inkjet head 13a ... Head A
13b ... Head B
14 ... Inkjet head unit 15 ... θ adjustment mechanism (θ axis)
16 ... Elevating mechanism (Z axis)
17 ... Z direction 18 ... θ direction 19 ... Inkjet head base plate 20 ... Alignment mark 31 ... Inkjet head mounting portion 32 ... Adjustment stage 33 ... Z base 34 ... X base 36 ... Linear guide 37a ... Jack bolt 1
37b ... Jack bolt 2
37c ... Jack bolt 3
37d ... Jack bolt 4
38 ... X direction 39 ... Y direction 40 ... Stepping motor 1
41 ... X-axis worm 42 ... X-axis eccentric cam 43a ... Vertical movement presser slide bearing 1
43b ... Vertically moving presser slide bearing 1
44 ... X-axis moving piece 45 ... Rotating shaft 46 ... Rotating direction 47 ... Stepping motor 2
48 ... θ-axis worm 49 ... θ-axis eccentric cam 50 ... θ-axis moving piece 51 ... θ base 61 ... Wing 1
62 ... Wing 2
63 ... Head A ink port 64 ... Head B ink port 65 ... Worm wheel 66 ... Round eccentric cam 67 ... Round eccentric cam shaft 68 ... Bottom dead center 69 ... Top dead center 70 ... Half-moon eccentric cam shaft 71 ... Straight part 1
72 ... Straight part 2
81: A part of the inkjet head unit 82 ... Inkjet head 83 ... Nozzle 84 ... Rotating shaft

Claims (10)

at least,
(A) an inkjet head unit including one or more inkjet heads in which a plurality of nozzles are arranged in a specific direction;
(B) a mechanism for adjusting the position of the inkjet head along the X direction orthogonal to the scanning direction Y of the inkjet head unit;
(C) a rotation adjusting mechanism for rotating the inkjet head unit about a Z-axis direction orthogonal to a plane formed from the X direction and the scanning direction Y of the inkjet head; and (d) both ends of the inkjet head. In an inkjet coating apparatus comprising: a detecting means for detecting the position of the nozzle of the part,
An ink jet coating apparatus, wherein a position of an axis of rotation of the ink jet head unit is arranged in the vicinity of a nozzle existing at an end along the X direction among a plurality of nozzles of the ink jet head.   The position of the axis of rotation of the ink jet head unit passes through the nozzle a existing at the end along the X direction among the plurality of nozzles of the ink jet head, and a straight line parallel to the scanning direction is L. If the line segment existing in the inkjet head unit is a straight line parallel to the line L ′, the maximum distance between L ′ and the nozzle a is 1/3 or less of the length of the inkjet head in the X direction. The ink jet coating apparatus according to claim 1, wherein the ink jet coating apparatus is disposed on a minute L ′ line.   The position of the axial center is arranged in a region where the nozzle is extended in the X direction among the two regions separated by the straight line L in the inkjet head unit. Inkjet coating device.   The inkjet coating apparatus according to any one of claims 1 to 3, wherein the X-direction adjusting mechanism is a mechanism that reciprocates the inkjet head unit by a predetermined section using an eccentric cam.   5. An ink jet coating apparatus, wherein the eccentric cam according to claim 4 has a half-moon shape and is driven by a stepping motor through a worm gear.   The inkjet coating apparatus according to claim 1, wherein the rotation adjusting mechanism is a mechanism that reciprocates the inkjet head unit by a predetermined section using an eccentric cam.   7. The ink jet coating apparatus according to claim 6, wherein the eccentric cam has a half-moon shape and is driven by a stepping motor through a worm gear.   The inkjet coating apparatus according to any one of claims 1 to 4, wherein the inkjet head unit includes a gap adjusting mechanism that corrects an inclination in a Z-axis direction.   The gap adjustment mechanism according to claim 8 is a mechanism for moving the inkjet head unit up and down in the Z-axis direction by at least one adjustment screw. Engineering equipment.   The inkjet coating apparatus according to any one of claims 1 to 4, wherein the inkjet head is attached in the Z direction from below the X direction adjustment mechanism and the rotation direction adjustment mechanism.

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