JP2013095128A - Assembling method of inkjet head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembling method of an inkjet head for performing alignment of the inkjet head highly accurately.SOLUTION: An assembling method of an inkjet head includes a use state data acquisition step S07 for acquiring use state coordinate data of an inkjet head when the posture of a head unit obtained by assembling the inkjet head to a head plate based on reference coordinate data is changed and the head unit is set to a use state, a displacement amount acquisition step S11 for comparing the reference coordinate data with the use state coordinate data and acquiring the displacement amount of the inkjet head, a mounting data acquisition step S11 for acquiring mounting coordinate data obtained by correcting the reference coordinate data with the displacement amount, and a head assembling step S13 for assembling the inkjet head into the head plate based on the mounting coordinate data.

Description

  The present invention relates to an assembling method of an ink jet head in which the ink jet head is assembled to a head plate in a positioned state.

  2. Description of the Related Art Conventionally, a head unit assembly apparatus that positions and fixes a plurality of inkjet heads on a single head plate is known (see Patent Document 1). In this assembling apparatus, a head unit in which a plurality of inkjet heads are temporarily mounted on a substantially rectangular head plate is set on a set table, and the inkjet heads are aligned and fixed by image recognition. At this time, the head unit is set by fixing both longitudinal ends of the head plate to the belt-like block on the set table. That is, the head plate on which a plurality of inkjet heads are temporarily mounted is set in a state where the intermediate portion is lifted from the set table. In this state, the head correction device faces from above, and the temporarily mounted inkjet head is positioned and fixed with respect to the head plate. Thereafter, the head unit in which the inkjet head is aligned is fixed to the unit holder, and the carriage unit is assembled. Note that the head unit is set on the set table in an upside down state so that the ejection surface is up when the inkjet head is aligned.

JP 2007-090327 A

In the above assembly method, the head unit on the set table is supported and fixed at both ends in the longitudinal direction, and the inkjet head is positioned (aligned) in this state. That is, since the head unit (head plate) is screwed at both ends in the longitudinal direction, the head unit (head plate) is not extreme, but slightly bends downward due to its own weight, and the inkjet head is positioned in this state.
On the other hand, the assembled head unit is turned upside down and mounted on the drawing apparatus, and used in this state (ink ejection). Also in this case, the head unit that is turned upside down is attached to the drawing apparatus by using an attachment hole (baka hole) when set in the assembly apparatus.
For this reason, when the head unit (head plate) is mounted on the drawing apparatus, the head unit (head plate) bends in the reverse direction to the assembly, and the mounting position of the inkjet head at the time of drawing and the designed mounting position at the time of assembly. There was a problem that misalignment occurred. Therefore, even if drawing is performed using an inkjet head that is accurately aligned (should), the drawing accuracy (ink landing accuracy) is lowered.

  An object of the present invention is to provide an ink jet head assembly method capable of accurately aligning an ink jet head in view of the above points.

  The method for assembling an inkjet head according to the present invention is a method for obtaining use state coordinate data of an inkjet head when the posture of a head unit in which the inkjet head is assembled to a head plate is changed to a use state based on reference coordinate data. The state data acquisition step, the reference coordinate data and the use state coordinate data are compared, and the displacement amount acquisition step for acquiring the positional deviation amount of the inkjet head, and the mounting coordinate data obtained by correcting the reference coordinate data by the positional deviation amount are acquired. A mounting data obtaining step and a head assembling step for assembling the ink jet head to the head plate based on the mounting coordinate data are provided.

  According to this configuration, the inkjet head is assembled to the head plate based on the mounting coordinate data. This mounting coordinate data is determined by the positional deviation amount of the inkjet head obtained by comparing the reference coordinate data and the use state coordinate data. The reference coordinate data is corrected. For this reason, even if the head unit is changed in posture between when the ink jet head is assembled and used, and the head plate undergoes unnecessary bending or the like, the ink jet head can be assembled to the head plate in anticipation of this. Therefore, even if the posture of the head unit is changed between assembly and use, the inkjet head can be accurately aligned and assembled to the head plate.

  In this case, in the head assembly process, the inkjet head is assembled to the head plate in an upward state, and in the use state data acquisition process, the use state coordinate data is acquired in a state reversed from the head unit in the head assembly process. It is preferable.

  According to this configuration, the head unit (head plate) bends in the opposite direction between assembly and use when the head unit at the time of assembly is turned upside down and used (posture change). However, since the inkjet head is assembled to the head plate based on the mounting coordinate data, the inkjet head can be accurately aligned and assembled to the head plate.

  The head unit is put into use by supporting and fixing the head plate to the unit holder, and the assembly of the inkjet head in the head assembling process may be performed on the head plate before supporting and fixing to the unit holder. preferable.

  According to this configuration, since the ink jet head is assembled in the state of the head plate, it is easy to handle and it is possible to prevent the structure of the assembling apparatus from becoming complicated and large.

  In this case, the use state data acquisition step is preferably performed in a state where the head plate is supported and fixed to the unit holder.

  According to this configuration, it is possible to acquire use state data at the time of actual use, and it is possible to accurately align the ink jet head and assemble it to the head plate in accordance with the actual use.

  In the use state data acquisition step, it is preferable to acquire average use state coordinate data performed for a plurality of head units.

  According to this configuration, it is possible to efficiently assemble the inkjet head to the head plate without impairing the alignment accuracy.

  On the other hand, the reference coordinate data is preferably generated by image recognition of the reference mark formed on the alignment mask.

  In this case, it is preferable to generate the reference coordinate data every time in the head assembling step.

  According to these configurations, the inkjet head can be aligned without being affected by the calibration accuracy (including the influence of the ambient temperature) on the image recognition side.

It is an external appearance perspective view of a carriage unit. It is a side view of a carriage unit. It is an external appearance perspective view of a head plate. It is an external appearance perspective view of an inkjet head. FIG. 2 is a structural diagram schematically showing an assembly device of a head unit. It is a top view of an alignment mask. It is a block diagram showing the control structure of the assembly apparatus of a head unit. FIG. 2 is a structural diagram schematically showing a drawing apparatus. It is a flowchart which shows the assembly method of a head unit.

  Hereinafter, a method for assembling a head unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. The head unit is assembled with a plurality of ink jet heads that discharge minute ink droplets, and is further attached to the unit holder in this state. Finally, the head unit is in the state of a carriage unit composed of the head unit and the unit holder. Installed.

  First, the carriage unit 1 will be described in detail with reference to FIGS. As shown in FIGS. 1 and 2, the carriage unit 1 includes a head unit 2 on which twelve inkjet heads 20 are mounted, a unit holder 3 attached to the head unit 2, and both short sides of the head unit 2. A pair of left and right pipe connection assemblies 4 that are located and supply functional liquid (ink) to each inkjet head 20, and wiring connections that are disposed above the carriage unit 1 and connected to the inkjet head 20 for ejection control And an assembly 5.

  The head unit 2 includes twelve inkjet heads 20 and a substantially rectangular head plate 21 to which these inkjet heads 20 are attached. On the other hand, the unit holder 3 includes a pair of left and right plate support members 30 attached to both short sides of the head plate 21, and a carriage attachment frame 31 that spans the upper ends of the pair of plate support members 30. ing.

  The twelve inkjet heads 20 are assembled to the head unit 2 by dividing each of the six inkjet heads 20 left and right. Each set of six inkjet heads 20 combines two types of inkjet heads 20 that eject three types of functional droplets (ink droplets) of R color, G color, and B color, respectively. Are displaced in a staircase pattern. That is, each set of six inkjet heads 20 is arranged in the same arrangement pattern in color arrangement and arrangement.

  As shown in FIG. 3, the ink jet head 20 is a so-called double ink jet head, and includes a functional liquid introduction part 41 having two connection needles 40, and a double head substrate 42 connected to the functional liquid introduction part 41. And a head main body 43 that discharges the functional liquid continuously below the head substrate 42 (FIG. 2A). The functional liquid introduction part 41 has a pair of connection needles 40 and receives the supply of the functional liquid from the pipe connection assembly 4. The head body 43 includes a double pump unit 46 formed of a piezoelectric element such as a piezo element, and a nozzle plate 47 having a nozzle surface 45 on which a plurality of discharge nozzles 44 are formed. The head substrate 42 is provided with two series of connectors 48, and each connector 48 is connected to the control unit via a flexible flat cable (not shown) extending from each wiring connection assembly 5. . The drive waveform output from the control unit is applied to each pump unit 46 (piezoelectric element) via each connector 48, so that the functional liquid is discharged from each discharge nozzle 44.

  As shown in FIG. 4, the head plate 21 is made of a thick plate such as stainless steel, and includes a head assembly portion 50 for assembling twelve inkjet heads 20 and a pair of side extensions located on both sides of the head assembly portion 50. It is formed integrally with the installation part 51. The head assembling part 50 is formed wider than the side extending part 51 and has 12 mounting openings 52 for attaching the 12 inkjet heads 20. In addition, a pair of reference pins 53 project from the back surface (see FIG. 2A). The pair of reference pins 53 is used during head alignment and serves as a reference for positioning (position recognition) of the head unit 2 on the premise of image recognition. The inkjet head 20 has its head main body 43 protruded downward from a mounting opening 52 formed in the head plate 21 with the nozzle surface 45 facing downward, via a head holding member 22 applied from below. It is fixed to the head plate 21 in a positioned state (see FIGS. 2A and 2B). Further, the head holding member 22 is bonded to the head plate 21, and is then permanently fixed using a mechanical fixing means.

  On the other hand, the pair of side extending portions 51 are formed with a pair of plate fixing through holes 54 for attaching the head plate 21 to the plate support member 30. As shown in FIGS. 2 and 4, the head plate 21 is fixed to the plate support member 30 with the four corners being fixed by plate fixing screws 55 through a total of four plate fixing through holes 54. In the assembly apparatus A described later, the head plate 21 is fixed to the set table 61 using the four plate fixing through holes 54.

Next, an assembly method of the head unit 2 and an assembly apparatus A that performs the assembly will be described with reference to FIGS.
The method of assembling the head unit 2 of this embodiment is to prepare the head unit 2 in a state where each inkjet head 20 is temporarily mounted (temporarily fixed) on a single head plate 21. That is, the head unit 2 in which a plurality of inkjet heads 20 are temporarily assembled is assembled in a previous process (outer process).

  Next, the head unit 2 is introduced into the assembling apparatus A. Before that, the alignment mask M is introduced, and this is image-recognized to obtain reference position data for alignment. Next, instead of the alignment mask M, the head unit 2 is introduced into the assembling apparatus A, and each inkjet head 20 is aligned and fixed based on the acquired reference position data. The head unit 2 in which the inkjet head 20 is aligned and fixed by the assembling apparatus A is assembled into the unit holder 3 after being subjected to a cleaning / inspection process, and further, the wiring connection assembly 5, the pipe connection assembly 4, etc. It is mounted on the drawing apparatus B through a component assembly process.

  FIG. 5 is a diagram schematically showing the assembly apparatus A for the head unit 2. As shown in the figure, the assembling apparatus A mounts the head unit 2 to be assembled and the alignment mask M in a replaceable manner, and mounts the mounted head unit 2 or the alignment mask M in the X axis direction, the Y axis direction, and the θ direction. And a recognition camera 80 for recognizing images of the head unit 2 and the alignment mask M, respectively. The assembling apparatus A also includes a head correction unit 90 that mechanically corrects the position of the inkjet head 20 based on the recognition result of the recognition camera 80, and a head fixing unit 91 that fixes (adheres) the inkjet head 20 whose position has been corrected. And a control unit 92 (see FIG. 6) that performs overall control of each of the above components.

  The unit moving unit 60 includes a set table 61 to which the head unit 2 (alignment mask M) is detachably attached to the upper surface, a θ table 62 that supports the set table 61 from below, and a θ table 62 from below. And an XY table 63 for supporting the X / Y table 63 from the lower side. As will be described in detail later, the head unit 2 (or alignment mask M) set on the set table 61 is subjected to X and Y tables 63 and X / Y table 63 for position correction based on the recognition result of the recognition camera 80. It is slightly moved in the axial direction, the Y-axis direction, and the θ direction.

  The head correction unit 90 engages the head holding member 22 to position the inkjet head 20, and the inkjet head 20 via the arm unit 90a moves the inkjet head 20 in the X axis direction, the Y axis direction, and the θ direction. And a correction mechanism 90b that can be moved minutely. That is, the head correction unit 90 positions the inkjet head 20 with respect to the head plate 21 based on the recognition result of the recognition camera 80.

  The head fixing portion 91 has an injection unit 91 a for injecting an adhesive into the head holding member 22 and an injection mechanism portion 91 b for causing the injection unit 91 a to face the head holding member 22. The injection unit 91a faces the portion of the head holding member 22 with respect to the inkjet head 20 positioned and fixed by the head correction unit 90, and injects an adhesive into the interface between the head plate 21 and the head holding member 22.

  Here, the alignment mask M of the present embodiment will be described with reference to FIG. In the assembly apparatus A of the embodiment, in order to always supply the head unit 2 having a certain level of head alignment accuracy, an alignment mask M in which the reference positions of the head plate 21 and the 12 inkjet heads 20 are marked is used. That is, the alignment mask M is used as a prototype (original) at the part position, and the head unit 2 as a duplicate is assembled by the assembling apparatus A. As a result, the accuracy influences such as the wrinkles of each assembly apparatus A on the head unit 2 and the change over time of the recognition camera 80 are eliminated.

  The alignment mask M is made of thick transparent quartz glass so as not to be distorted as a prototype. On the surface of the alignment mask M, two sets of two head reference marks Mb representing the reference position of each inkjet head 20 are formed as one set, and a total of 12 sets of 6 sets are formed on both sides. A pair of unit reference marks Ma representing the reference position of the head unit 2 is formed outside the 12 sets of head reference marks Mb. The head reference mark Mb corresponds to the two outermost discharge nozzles 44 of one nozzle row in the inkjet head 20, and the unit reference mark Ma corresponds to the reference pin 53 of the head unit 2 (head plate 21). doing. Although omitted in FIG. 7, the alignment mask M is attached to the mask holder and set in the unit moving unit 60 in this state.

  In this embodiment, the alignment mask M is set in the assembly apparatus A so as to be replaced with the head unit 2. The height of the nozzle surface 45 of the ink jet head 20 set in the unit moving unit 60 and the lower surface of the alignment mask M set in the unit moving unit 60 are adjusted so as to be in the same plane. . The alignment mask M has the same weight as the head unit 2 including the mask holder. Thereby, since the image recognition by the recognition camera 80 can be performed under the same conditions (the same depth of focus), the inkjet head 20 can be accurately aligned based on the image recognition of the alignment mask M.

  As shown in FIG. 5, the recognition camera 80 is fixedly provided on a frame-type base 81 directly above the unit moving unit 60. In a state where the alignment mask M is set on the unit moving unit 60, the recognition camera 80 recognizes an image of the unit reference mark Ma and the head reference mark Mb of the alignment mask M in order to acquire reference coordinate data and the like described later. In the state where the head unit 2 is set in the unit moving unit 60, the recognition camera 80 acquires the reference pin 53 (the front end surface thereof) of the head unit 2 and each inkjet head in order to acquire use state coordinate data and the like which will be described later. The 20 outermost two discharge nozzles 44 are image-recognized. The reference pin 53 protrudes from the back surface of the head plate 21 so as to have substantially the same height as the inkjet head 20 protruding from the head unit 2.

  Next, the control configuration of the assembly apparatus A will be described with reference to FIG. As shown in the block diagram of FIG. 1, the assembling apparatus A drives an input unit 93 for inputting position data and the like of the head unit 2 and the inkjet head 20 via the operation panel 93a, and a component device such as the unit moving unit 60. A driving unit 94 that performs position recognition by the recognition camera 80, and a control unit 92 that performs overall control of each component device of the assembling apparatus A. The driving unit 94 includes a moving driver 101 that controls driving of the unit moving unit 60, a correction driver 102 that controls driving of the head correcting unit 90, a fixing driver 103 that controls driving of the head fixing unit 91, and the like. have.

  The control unit 92 includes a CPU 111, a ROM 112, a RAM 113, and a P-CON 114, which are connected to each other via a bus. The ROM 112 stores various control data in addition to the control program processed by the CPU 111. The RAM 113 has various register groups in addition to a position data area for storing position data input from the outside, position data acquired by the recognition camera 80 from the alignment mask M, and the like, and is used as a work area for control processing.

  The CPU 111 inputs various detection signals, various commands, various data, and the like via the P-CON 114 according to the control program in the ROM 112, processes various data in the RAM 113, and outputs a control signal to the drive unit 94. To do. Thereby, the entire assembly apparatus A such as the unit moving unit 60, the head correcting unit 90, the head fixing unit 91, and the like is controlled. For example, the reference coordinate data of the alignment mask M obtained from the recognition camera 80 and the use state coordinate data of the head unit 2 obtained from the recognition camera 80 are stored in the storage area in the RAM 113, and the reference coordinate data according to the control program in the ROM 112. The data is compared with the use state coordinate data, and the unit moving unit 60, the head correcting unit 90, the head fixing unit 91, and the like are controlled based on the comparison result.

  Next, with reference to FIG. 8, the drawing apparatus B on which the head unit 2 assembled by the assembly apparatus A is mounted will be briefly described. As shown in the schematic diagram of FIG. 8, the drawing apparatus B mounts the carriage unit 1 (head unit 2) and moves the head unit 71 in the Y-axis direction and the θ direction, and the head moving table 71. A work moving table 72 for moving a work W such as a color filter in the X-axis direction and a maintenance unit 73 for maintaining the head unit 2 (inkjet head 20) are provided. In the drawing apparatus B, the workpiece W is moved in the X-axis direction by the workpiece moving table 72, and the carriage unit 1 (head unit 2) is moved in the Y-axis direction by the head moving table 71 to perform main scanning and sub-scanning. A filter material or the like (ink) is discharged (drawn).

  A head recognition camera 74 is mounted upward on the work movement table 72, and a work recognition camera 75 is mounted downward on the carriage unit 1. The head recognition camera 74 recognizes the reference pin 53 of the head unit 2 for positioning the head unit 2, and the workpiece recognition camera 75 recognizes the reference mark of the workpiece W for positioning the workpiece W. The head recognition camera 74 and the workpiece recognition camera 75 are calibrated with high accuracy, and the head unit 2 (inkjet head 20) positioned based on the recognition result of the head recognition camera 74, and the workpiece recognition camera 75. The workpiece W positioned based on the recognition result is positioned with high accuracy before drawing.

  By the way, the head unit 2 of the present embodiment is mounted and used in the drawing apparatus B with the respective inkjet heads 20 facing downward while being assembled to the head plate 21 with the respective inkjet heads 20 facing upward in the assembly apparatus A. As described above, although the head plate 21 is formed of a thick stainless steel plate, it is confirmed that the head plate 21 bends slightly when supported horizontally at both ends in the longitudinal direction. This means that, as viewed from the nozzle surface 45, the inkjet head 20 is assembled and used in a convexly curved state with the head plate 21 curved in a concave shape. Therefore, even if the inkjet head 20 is assembled upward with high accuracy, there is a problem that the assembly accuracy (positional accuracy of each inkjet head 20) cannot be compensated when used in the downward direction. Therefore, in the present embodiment, in anticipation of the backward deflection of the head plate 21 that occurs between the time of assembly and use, the ink jet head 20 is calculated backward so as to achieve the design assembly accuracy during use. I try to assemble it.

Hereinafter, a method of assembling the head unit 2 that solves the above problem will be described with reference to the flowchart of FIG.
In this assembling method, as a pre-process, a plurality of inkjet heads 20 are temporarily assembled on the head plate 21, the unit reference mark Ma indicating the position of the designed reference pin 53, and the position of the designed inkjet head 20. The above-described alignment mask M on which the head reference mark Mb indicating the above is marked is prepared. First, the alignment mask M is set in the assembling apparatus A (S01), and the unit reference mark Ma and the head reference mark Mb are recognized by the recognition camera 80. That is, the reference coordinate data of the head unit 2 is acquired (S02).

  Next, instead of the alignment mask M, the head unit 2 in which the inkjet head 20 is temporarily assembled is set in the assembling apparatus A (S03). Then, while recognizing the reference pin 53 with the recognition camera 80, the head unit 2 is slightly moved based on the reference coordinate data, and the head unit 2 is positioned (aligned). Next, while the image recognition of the two outermost discharge nozzles 44 in the first inkjet head 20 is performed by the recognition camera 80, the positioning (alignment) of the first inkjet head 20 is performed based on the reference coordinate data. Do. Here, an adhesive is injected into the first inkjet head 20 in the positioned state, and the inkjet head 20 is bonded and fixed to the head plate 21. When the adhesive is cured, the process proceeds to the second inkjet head 20 and performs the same operation as described above. By repeating such an operation, the 12 inkjet heads 20 are bonded and fixed to the head plate 21 (S04).

  In this embodiment, the bonded and fixed inkjet head 20 is further screwed. This screwing operation may be performed immediately after the adhesive is cured by providing a screw tightening portion in the assembly apparatus A, or the head. It may be performed when the plate 21 is assembled into the unit holder 3.

  After all the ink jet heads 20 are bonded and fixed to the head plate 21, the head unit 2 is removed from the assembly apparatus A and incorporated into the unit holder 3 and the pipe connection assembly 4 and the wiring connection assembly 5 are attached. Assemble (S05). Next, the carriage unit 1 assembled in this way is mounted on the drawing apparatus B (S06).

  As described above, the head recognition camera 74 is mounted on the drawing apparatus B. Therefore, the head unit 2 mounted on the drawing apparatus B is recognized using the head recognition camera 74. Specifically, using the head moving table 71 and the work moving table 72, the image of the two reference pins 53 and the twelve inkjet heads 20 (two discharge nozzles 44) is obtained by the head recognition camera 74 in the same manner as described above. Recognize. That is, it is mounted on the drawing apparatus B to be in a use state, and the use state coordinate data of the head unit 2 in this use state is acquired (S07: use state data acquisition step).

  Here, the acquired use state coordinate data is input to the control unit 92 via the operation panel 93a (S08). In the control unit 92, the reference coordinate data and the use state coordinate data are compared, and a positional shift amount is calculated for each of the two reference pins 53 and the 12 inkjet heads 20 (a shift amount acquisition step). Further, based on the positional deviation amount, mounting coordinate data in anticipation of positional deviation when the drawing apparatus is mounted is generated (S9: mounting data acquisition step).

  This mounting coordinate data is used in the assembly apparatus A, and is data in which the head unit 2 that is reversed and mounted on the drawing apparatus B is in anticipation of the positional deviation of the inkjet head 20 due to its deflection, By assembling the head unit 2 with the mounting coordinate data, the arrangement of the inkjet head 20 mounted on the drawing apparatus B is aimed to match the reference coordinate data. In addition, it is preferable to implement the above process with respect to the plurality of head units 2 of the same type and take the average value as mounting coordinate data.

  When the mounting coordinate data is acquired in this manner, the head unit 2 that is actually mounted (mounted) on the drawing apparatus B is assembled again. In this case, the head unit 2 is assembled based on the mounting coordinate data instead of the reference coordinate data, but the second alignment mask in which the unit reference mark Ma and the head reference mark Mb are marked based on the mounting coordinate data. It is preferable to prepare M. First, the second alignment mask M is set in the assembling apparatus A (S10). Then, in the same procedure as described above, the second alignment mask M is image-recognized to obtain mounting coordinate data (S11).

  Next, instead of the second alignment mask M, the mounting head unit 2 is set in the assembling apparatus A (S12). Here, based on the mounting coordinate data, the inkjet heads 20 are positioned and fixed in the same procedure as described above (S13: head assembling step). Thereafter, it is incorporated into the unit holder 3 and the pipe connection assembly 4 and the wiring connection assembly 5 are attached, and the carriage unit 1 is assembled (S14) and mounted on the drawing apparatus B. It should be noted that it is preferable to acquire mounting coordinate data from the second alignment mask M every time in assembling the mounting head unit 2.

  As described above, according to the present embodiment, the use state coordinate data is acquired from the head unit 2 mounted on the drawing apparatus B and in the use state, and the reference coordinate data is corrected based on the use state coordinate data. The mounting coordinate data is generated, and the head unit 2 is assembled by the assembling apparatus A based on the mounting coordinate data. Therefore, even if the head unit 2 is turned upside down between the assembly and use of the inkjet head 20, and the head plate 21 is bent in the opposite direction, the head unit 2 can be assembled in anticipation of this. it can. Therefore, even if the posture of the head unit 2 is changed, the inkjet head 20 can be accurately aligned and assembled to the head plate 21.

  As described above, since the head unit 2 can be assembled in consideration of the deflection of the head plate 21 during use (during drawing), the drawing apparatus B can achieve high landing accuracy, that is, high drawing quality. it can.

  In the assembling apparatus A, the image recognition and alignment of the ink jet head 20 may be performed in a state where the head unit 2 is assembled to the unit holder 3 (reforming of the assembling apparatus A is necessary). Further, the head unit 2 may be assembled directly based on the generated mounting coordinate data without using the second alignment mask M. Further, in the present embodiment, the head unit 2 is inverted between the front and back during assembly and use. However, as long as the posture of the head unit 2 is changed between the assembly and use (for example, The head unit 2 is used in a vertical posture), and the present invention is applicable. Furthermore, the number and arrangement order of the plurality of inkjet heads 20 are arbitrary.

  1 Carriage unit, 2 Head unit, 3 Unit holder, 20 Inkjet head, 21 Head plate, 22 Head holding member, 44 Discharge nozzle, 45 Nozzle surface, 53 Reference pin, 60 Unit moving part, 71 Head moving table, 72 Work moving Table, 74 head recognition camera, 80 recognition camera, 90 head correction section, 91 head fixing section, 92 control section, A assembly apparatus, B drawing apparatus, M alignment mask, Ma unit reference mark, Mb head reference mark,

Claims (7)

Based on the reference coordinate data, a use state data acquisition step of acquiring use state coordinate data of the ink jet head when the head unit in which the ink jet head is assembled to the head plate is changed in posture to be in a use state;
A displacement amount acquisition step of comparing the reference coordinate data with the use state coordinate data and acquiring a displacement amount of the inkjet head;
A mounting data acquisition step of acquiring mounting coordinate data in which the reference coordinate data is corrected by the positional deviation amount;
A method of assembling an ink jet head, comprising: a head assembling step of assembling the ink jet head to the head plate based on the mounting coordinate data. In the head assembly step, the inkjet head is assembled to the head plate in an upward state,
2. The method of assembling an ink jet head according to claim 1, wherein in the use state data acquisition step, the use state coordinate data is acquired in a state of being reversed from the head unit in the head assembly step. . The head unit is in a use state by supporting and fixing the head plate to a unit holder,
The method of assembling an inkjet head according to claim 1 or 2, wherein the assembly of the inkjet head in the head assembling step is performed on the head plate before being supported and fixed to the unit holder.   4. The method of assembling an ink jet head according to claim 3, wherein the use state data acquisition step is performed in a state where the head plate is supported and fixed to the unit holder.   5. The method of assembling an ink jet head according to claim 1, wherein, in the use state data acquisition step, average use state coordinate data obtained for a plurality of the head units is acquired.   6. The ink jet head assembling method according to claim 1, wherein the reference coordinate data is generated by recognizing an image of a reference mark formed on an alignment mask.   The inkjet head assembly method according to claim 6, wherein the reference coordinate data is generated each time in the head assembly step.

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