JP5401163B2 - Inkjet printing device - Google Patents

Description

  The present invention relates to an inkjet printing apparatus that forms a desired pattern on a substrate or the like by an inkjet method while conveying a substrate or the like to be printed.

  In the manufacturing process of color filters and the like used in display devices such as liquid crystal displays, plasma display panels (PDP), and organic EL displays, a plurality of types of ink are transferred onto the substrate by an inkjet method while transporting the substrate such as glass. 2. Related Art Inkjet ink jet printing apparatuses that discharge and form a pattern are used.

  In an inkjet printing apparatus, it is necessary to regularly or irregularly maintain an inkjet head that ejects ink. For this reason, when maintaining an inkjet head in a conventional inkjet printing apparatus, it is common to move the inkjet head to an offset position off the substrate transport path and perform maintenance on the inkjet head at that position. (For example, see Patent Document 1 and FIG. 5). FIG. 4 is a diagram showing a conventional inkjet printing apparatus described as a conventional example in Patent Document 1. As shown in FIG.

  In the ink jet printing apparatus as the first conventional example shown in FIG. 4, a substrate transport mechanism 101 for transporting a substrate 107 to be printed is fixed and supported on a base 103. A frame 102 </ b> A formed in a U shape is fixed to one side surface of the base 103. Here, the side surface of the base 103 is a surface parallel to the substrate transport direction (the direction indicated by the arrow X in FIG. 4), and is orthogonal to the substrate placement surface (suction surface) of the suction table 106 on which the substrate 107 is placed. It is a surface to do. A frame 102 </ b> B formed in a U shape is also fixed to the other side surface of the base 103. The frames 102A and 102B are fixed to the base 103. Further, a frame 102 </ b> C arranged in parallel with the frames 102 </ b> A and 102 </ b> B and having the same configuration as the frames 102 </ b> A and 102 </ b> B is disposed at a position away from the base 103.

  A joining frame 105 is fixed to a substantially middle portion of the upper side of each of the frames 102A, 102B, and 102C, and each of the frames 102A, 102B, and 102C is coupled by the joining frame 105. The inkjet head 104 that discharges ink to the substrate 107 is held by the connecting frame 105. During the printing operation, the inkjet head 104 is held so as to be supported by the connection frame 105 between the frames 102A and 102B, and during the maintenance process, the inkjet head 104 is connected to the frame 102B and the frame 102C. The inkjet head 104 is configured to move along the connecting frame 105 so as to be supported by the 105.

  In the conventional ink jet printing apparatus configured as described above, the suction table 106 that sucks and fixes the substrate 107 is moved in the substrate transport direction by the substrate transport mechanism 101 and is disposed at a desired position directly below the ink jet head 104. At this time, ink is ejected from the inkjet head 104 to the substrate 107, and for example, color filter pattern printing is performed.

  In the maintenance operation of the inkjet head 104 that is performed regularly or irregularly, the inkjet head 104 moves along the connecting frame 105 in a direction perpendicular to the substrate transport direction (direction indicated by an arrow Y in FIG. 4), and maintenance is performed. It is conveyed to the processing space 108 (area surrounded by a broken line in FIG. 4). Thus, maintenance processing is performed in the maintenance processing space 108 formed immediately below the inkjet head 104.

  However, in such a general configuration, when the inkjet head 104 is moved from the printing position to the maintenance position and maintenance processing is performed and then returned to the printing position, the ink liquid from the inkjet head 104 to the substrate 107 is restored. There was a problem that the landing position of the droplet changed. In order to solve such problems and improve printing accuracy, a conventional inkjet printing apparatus has been proposed to perform a maintenance operation in a state where the inkjet head is fixed without moving (for example, Patent Documents). 1, see FIG. 1 and FIG. FIG. 5 is a diagram illustrating the ink jet printing apparatus described in Patent Document 1. In FIG.

  In the conventional ink jet printing apparatus which is the second conventional example shown in FIG. 5, the substrate transport mechanisms 101A, 101B and 101C for transporting the substrate 107 are divided into three parts, and each of the substrate transport mechanisms 101A, 101B, 101C is supported and fixed by three divided bases 103A, 103B, and 103C, respectively. A base 103B that supports and fixes the substrate transport mechanism 101B, which is an intermediate portion, is configured to be movable in a direction orthogonal to the substrate transport direction.

  Each of the frames 102A and 102B formed in a U-shape is fixed to the respective side surfaces of the bases 103A and 103C, and is disposed so as to straddle the intermediate base 103B. In this way, the frames 102A and 102B are fixed to the bases 103A and 103C on the lower side of the pillars, which are vertical portions, and the upper side portions of the frames 102A and 102B are configured to be parallel to the substrate transport direction. The inkjet head 104 is supported and fixed by a connecting frame 105 fixed to a substantially middle portion of the upper side portion of each of the frames 102A and 102B. Accordingly, the connecting frame 105 that supports and fixes the inkjet head 104 is supported and fixed to the bases 103A and 103C via the frames 102A and 102B.

  In the ink jet printing apparatus of the second conventional example shown in FIG. 5, the substrate transport mechanism 101B, which is an intermediate portion, and the base 103B that supports and fixes the substrate transport mechanism 101B are placed on a fixed base 103D that is fixed between the bases 103A and 103C. The formed base moving mechanism 109 is configured to be movable in a direction perpendicular to the substrate transport direction. Therefore, after the maintenance process, when the suction table 106 for sucking the substrate 107 starts a printing operation in which the suction table 106 moves immediately below the inkjet head 104, the base 103B moves and the divided substrate transport mechanisms 101A, 101B, The substrate transport axis in 101C is on the same axis, and the substrate 107 can be moved in the substrate transport direction.

  The ink jet printing apparatus shown in FIG. 5 shows a state during maintenance processing of the ink jet head 104, and an area serving as a maintenance processing space necessary for maintenance processing is secured below the ink jet head 104.

  As described above, during the printing operation, all the substrate transport mechanisms 101A, 101B, and 101C are arranged in a straight line, and the substrate transport mechanism 101B in the intermediate portion is arranged at the position during the printing operation together with the base 103B. Yes. In the substrate transport mechanisms 101A, 101B, and 101C arranged in a straight line in this way, the suction table 106 that sucks and fixes the substrate 107 moves linearly along the substrate transport direction. In this printing operation, when the substrate 107 on the suction table 106 reaches a predetermined printing position, desired ink is ejected from the inkjet head 104 and, for example, pattern printing of a color filter is executed on the substrate 107.

  As another conventional inkjet printing apparatus, a mechanism has been proposed in which a maintenance unit is inserted directly under an inkjet head from a direction orthogonal to the substrate transport direction to perform maintenance processing (see, for example, Patent Document 2).

  FIG. 6 is a schematic configuration diagram showing a conventional inkjet printing apparatus as a third conventional example proposed in Patent Document 2. In FIG. In the ink jet printing apparatus of the third conventional example shown in FIG. 6, paper is used as a printing target, and printing is performed by ejecting ink onto the paper from the ink jet head. In FIG. 6, a paper feed unit 110, a paper transport mechanism 111, and a paper discharge unit 112 are disposed from the lower side in the drawing, and a plurality of inkjet heads 113 are provided in the middle of the paper transport path in the paper transport mechanism 111. . During a printing operation, a maintenance unit 116 including a purge mechanism 114 and a wipe mechanism 115 is disposed at a retracted position on the right side in the figure that is separated from the inkjet head 113. During the maintenance process, the inkjet head 113 is raised, and a direction perpendicular to the sheet conveyance direction (arrow Z in FIG. 6) is formed in the space between the inkjet head 113 and the sheet conveyance mechanism 111 generated by the elevation of the inkjet head 113. The maintenance unit 116 is inserted from (direction). The maintenance unit 116 inserted and arranged below the inkjet head 113 repeats the operations in the vertical direction and the horizontal direction to perform a predetermined maintenance process on the inkjet head 113.

  However, in the third conventional ink jet printing apparatus shown in FIG. 6, in order to insert the maintenance unit 116 into the paper transport path, it is necessary to move the ink jet head 113 upward to form a maintenance processing space. Therefore, the inkjet head 113 returns to the position during the printing operation in the same manner as when the inkjet head 104 is moved in the lateral direction (arrow Y direction) in the first conventional inkjet printing apparatus shown in FIG. In this case, the landing position of the ink droplet may be shifted. Furthermore, in the configuration of the ink jet printing apparatus of the third conventional example shown in FIG. 6, when the printing target is not a paper but a substrate, the maintenance unit becomes large, so that the maintenance unit is a substrate during maintenance processing. It is necessary to move the inkjet head high to some extent so that it can be inserted into the transport path, and to secure a large maintenance processing space below the inkjet head. For this reason, the moving distance of the ink-jet head becomes long, and the position at the time of the maintenance process and the position at the time of the printing operation are separated from each other. Further, it is possible to secure a maintenance processing space below the inkjet head by laying the substrate transport mechanism substantially below the substrate transport level, but in such a configuration, the arrangement level of the substrate transport mechanism, Since the arrangement levels of the substrates to be conveyed are separated, errors due to pitching and rolling of the suction table by the substrate conveyance mechanism are enlarged, and the ink droplet landing accuracy is further deteriorated.

JP 2007-24504 A JP 2004-130583 A

  As shown in FIGS. 4 and 5 described above, in the conventional ink jet printing apparatus, the frames 102A and 102B formed in a U-shape are fixed to one side surface of the bases 103, 103A, and 103C. A connecting frame 105 for fixing the inkjet head 104 is provided between two frames 102A and 102B disposed on both sides of the base. Then, the inkjet head 104 or a part (103B) of the substrate transport mechanism is configured to move so as to pass between the two columns in each of the frames 102A and 102B. In the conventional inkjet printing apparatus configured as described above, the frames 102A and 102B are made large in order to maintain a high degree of rigidity while securing a certain amount of space between the two pillars in each frame 102A and 102B. It was necessary to construct firmly. Also, as shown in FIG. 6, when the maintenance unit 116 is configured to be inserted below the inkjet head 113, a large space is secured between the pillars in the frame so that a maintenance unit having a large dimension can be passed. Therefore, it is not easy to give the frame high rigidity. Therefore, in the conventional inkjet printing apparatus configured as described above, it is not easy to improve the landing accuracy of the ink droplets from the inkjet head fixed to the connecting frame connecting the frames on both sides of the base to the substrate. There wasn't.

  In addition, when a plurality of types of inks are applied at the same time, for example, three types of inks (R, G, B) are applied simultaneously, the inkjet head becomes large and heavy, and the maintenance unit is accordingly enlarged. In order to configure such a maintenance unit so that it can pass between the columns in the frame, it is necessary to further increase the distance between the columns of the frame, and it is desirable to use a connecting frame for fixing the frame and the inkjet head. It is difficult to ensure the rigidity of the ink droplets, and the landing accuracy of ink droplets from the inkjet head is further deteriorated.

  In addition, when the ink used has a high quick-drying property, the surface of the ink-jet head may be dried during the substrate alignment process, and non-ejection that may cause printing failure may occur. In order to prevent such drying, there is a coping method in which the ink jet head always ejects ink at a low frequency except during the printing operation. In such a countermeasure, the substrate alignment position needs to be set to a position different from the printing position, and the substrate is moved to the printing position after performing the substrate alignment process. For this reason, when the accuracy of the substrate moving mechanism is low, there is a problem that the landing accuracy of ink droplets deteriorates.

  Furthermore, with the recent increase in the size of the screen of the display device and the increase in the size of the substrate, the manufacturing facilities have increased in size, and at the same time, the ink droplet landing accuracy should be further increased in this field. This is an important issue.

  An object of the present invention is to solve the problem in the conventional ink jet printing apparatus, and to provide an ink jet printing apparatus capable of applying one kind or plural kinds of inks with high accuracy. In particular, an object of the present invention is to provide an ink jet printing apparatus capable of forming a highly accurate pattern on a substrate having a large substrate size. It is another object of the present invention to provide an ink jet printing apparatus that can cope with a case where ink having high quick drying properties is used or when frequent maintenance of the ink jet head is required.

In order to achieve the above object, an inkjet printing apparatus according to a first aspect of the present invention includes:
A substrate transport mechanism for supporting and transporting the substrate on the substrate placement surface of the suction table;
A plurality of inkjet heads arranged in parallel in the substrate transport direction and for discharging ink onto the substrate transported by the substrate transport mechanism;
A base on which the substrate transport mechanism is supported and fixed, the base being parallel to the substrate transport direction and having both side surfaces orthogonal to the substrate placement surface of the suction table and serving as both sides of the substrate transport path ;
A plurality of reinforcing frames that are fixed to the both side surfaces of the base and that disperse and support the plurality of inkjet heads;
A plurality of fixed frames for fixing each of the plurality of reinforcing frames to connect each other;
A plurality of alignment cameras that are supported and fixed to the reinforcing frame, and for positioning the substrate before pattern formation on the substrate;
A maintenance unit for performing maintenance of the inkjet head;
A maintenance unit moving mechanism for moving a maintenance table on which the maintenance unit is supported and fixed, and
The maintenance unit moving mechanism has a moving axis in the same direction as the substrate transport mechanism, and is configured such that the suction table and the maintenance unit are exclusively arranged directly below the inkjet head . In the ink jet printing apparatus according to the first aspect configured as described above, a plurality of ink jet heads can be dispersed and supported and fixed by a so-called rigid frame reinforcing frame, so that the ink jet head is supported and fixed to a highly rigid reinforcing frame. Therefore, it is possible to improve the landing accuracy of the ink droplets on the substrate to be printed. In the ink jet printing apparatus of the first aspect, when the ink to be used is difficult to dry and frequent maintenance of the ink jet head is not necessary, the above configuration can cope with it. According to a first aspect of the present invention, there is provided an inkjet printing apparatus having a configuration in which the alignment position of the substrate is different from the printing position, and even if the alignment camera and the inkjet head cannot be installed on the same beam for design reasons, Since the relative positional relationship of the alignment camera can be maintained with high accuracy, the landing accuracy of ink droplets can be improved. The ink jet printing apparatus according to the first aspect is particularly useful when maintenance needs to be carried out frequently due to the characteristics of the ink used and the ink jet head, and the maintenance unit can be easily placed in the space immediately below the ink jet head. And it can insert reliably. Furthermore, the ink jet printing apparatus according to the first aspect is configured so that the suction table and the maintenance unit are exclusively arranged on the moving axis in the same direction, so that the substrate transport mechanism or the like directly under the ink jet head is moved. Ink jet head maintenance can be performed easily and reliably without causing any adverse effects on the landing accuracy.

An ink jet printing apparatus according to a second aspect of the present invention is the ink pan according to the first aspect, wherein the ink pan receives ink ejected from the ink jet head immediately below the ejection portion of the ink jet head.
An ink pan moving mechanism for moving the ink pan between a position immediately below the discharge portion of the inkjet head and a retracted position;
The ink pan moving mechanism inserts the ink pan directly under the ejection portion of the inkjet head from a direction orthogonal to the substrate transport direction while the inkjet head is waiting, and ejects ink from the inkjet head to the ink pan. It is configured to let you. The ink jet printing apparatus according to the second aspect configured as described above can eject ink from the ink jet head at a low frequency or a high frequency even during a printing operation when the quick drying property of the ink is extremely high. The ink jet printing apparatus according to the second aspect can dry the surface of the ink jet head because the ink jet head can always eject ink onto the ink pan at low frequency or high frequency except during printing operation and maintenance processing. This is a configuration that can be prevented.

In the ink jet printing apparatus according to the third aspect of the present invention, the reinforcing frame according to the first aspect is fixed between both side surfaces of the base, which are both sides of the substrate transport path, and between the column parts. And a beam portion extending in a direction orthogonal to the substrate transport direction, and the inkjet head is supported and fixed to the beam portion. In the ink jet printing apparatus of the third aspect configured as described above, the ink jet head is reliably supported and fixed by the rigid frame having high rigidity, and the ink droplet landing accuracy can be improved.

  The ink jet printing apparatus of the present invention can apply one or more types of ink to a printing object with high accuracy, and can easily perform maintenance of the ink jet head with high reliability. In particular, according to the present invention, it is possible to provide an ink jet printing apparatus that can form a pattern with high accuracy on a substrate having a large substrate size. Therefore, it is possible to cope with the case where the maintenance of the ink jet head is frequently required.

The perspective view which shows the structure of the inkjet printing apparatus in suitable embodiment which concerns on this invention. In a preferred embodiment according to the present invention, a perspective view showing a state in which an inkjet head ejects ink onto an ink pan at a low frequency. The perspective view which shows the truss structure of the reinforcement | strengthening frame arranged side by side in suitable embodiment which concerns on this invention. The perspective view which shows the structure of the conventional inkjet printing apparatus as a 1st prior art example. The perspective view which shows the structure of the conventional inkjet printing apparatus as a 2nd prior art example. The perspective view which shows the structure of the conventional inkjet printing apparatus as a 3rd prior art example.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments according to the invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view showing a configuration of an ink jet printing apparatus according to a preferred embodiment of the present invention. In FIG. 1, in the ink jet printing apparatus according to the present embodiment, a substrate transport mechanism 1 is fixed and supported by a rectangular base 3, and a suction table 6 that sucks and places a substrate 7 is placed on the substrate transport mechanism 1. It is comprised so that it can convey. Further, in the ink jet printing apparatus of the present embodiment, the two column portions 14 and 14 extending in the vertical direction and the upper ends of the column portions 14 and 14 are fixed and disposed horizontally. A U-shaped first reinforcing frame 2 </ b> A constituted by the beam portion 15 is provided. The first reinforcing frame 2A is disposed so as to straddle the base 3, and each column portion 14 of the first reinforcing frame 2A is fixed to both side surfaces of the base 3 serving as both sides of the substrate transport path. . Here, the side surface of the base 3 is a surface parallel to the substrate transport direction, and is a surface orthogonal to the substrate placement surface (suction surface) of the suction table 6 on which the substrate 7 is placed.

  The first inkjet head 4R is fixed to the beam portion 15 in the first reinforcing frame 2A. Further, a second reinforcing frame 2B that is arranged in parallel with the first reinforcing frame 2A and has the same configuration as the first reinforcing frame 2A is disposed so as to straddle the base 3. A second inkjet head 4G and a third inkjet head 4B are provided so as to sandwich the beam portion 15 of the second reinforcing frame 2B.

  Further, a third reinforcing frame 2C configured in the same manner as the first and second reinforcing frames 2A and 2B is fixed to the column portion 14 similarly to the base 3. The lower end portions of the column portions 14 in the reinforcing frames 2A, 2B, and 2C are fixed to both side surfaces of the base 3, and the longitudinal direction of each beam portion 15 is disposed so as to be orthogonal to the substrate transport direction. Yes. Further, the fixed frames 5 are fixed to the reinforcing frames 2A, 2B, and 2C so as to connect the upper end portions of the respective beam portions 15.

  The inkjet heads 4R, 4G, and 4B that discharge ink to the substrate 7 are fixed and supported at substantially intermediate portions of the beam portions 15 of the first and second reinforcing frames 2A and 2B. Each of the inkjet heads 4R, 4G, and 4B is securely fixed to the first and second reinforcing frames 2A and 2B that are rigid rigid frame structures after the position adjustment with respect to the substrate transport path. In addition, the plurality of alignment cameras 8 for performing the alignment processing of the substrate 7 are provided on the beam portion 15 of the third reinforcing frame 2C so as to face the substrate transport path.

  The first and second reinforcing frames 2A and 2B constitute a strong rigid frame structure together with the base 3, and each of the plurality of inkjet heads 4R, 4G and 4B includes the first and second reinforcing frames 2A and 2B. Are dispersed and supported by the beam portions 15. Similarly, the third reinforcing frame 2C constitutes a strong rigid frame structure together with the base 3, and each of the plurality of alignment cameras 8 is supported and fixed to each beam portion 15 in the third reinforcing frame 2C. .

  A substrate 7 such as light transmissive glass to be printed is supported and fixed to the suction table 6. A plurality of air suction holes are formed in the suction table 6, and air is sucked through the air suction holes to fix the substrate 7 to be printed by suction. Although not shown, the suction table 6 is provided with a moving mechanism so that the suction table 6 can be adjusted to a desired position and angle.

  In the ink jet printing apparatus according to the present embodiment, the suction table 6 linearly passes through the substrate transport area including the print area below the inkjet heads 4R, 4G, 4B and the alignment camera 8 arranged by the substrate transport mechanism 1. It is configured to be movable. Further, in the ink jet printing apparatus of the present embodiment, a maintenance unit moving mechanism 11 having the same moving axis is provided on the base 3 so as to move in the same direction as the substrate transport mechanism 1. The maintenance unit moving mechanism 11 moves the maintenance table 10 on which the maintenance unit 9 is fixedly installed in the same direction as the substrate transport direction. The maintenance table 10 is moved from the retracted position shown in FIG. 1 to the inkjet heads 4R, 4G, It is moved to the maintenance area which is the same as the printing area immediately below 4B.

  As described above, the suction table 6 and the maintenance table 10 are configured to move in the substrate transport direction. However, during the printing operation, the suction table 6 moves to the printing area (in the direction of arrow X1 in FIG. 1), and the maintenance table. 10 moves to the save area. Further, during the maintenance process, the suction table 6 moves to the save area, and the maintenance table 10 moves to the maintenance area which is the printing area (in the direction of arrow X1 in FIG. 1). As described above, when one of the suction table 6 and the maintenance table 10 performs the printing operation or the maintenance process, the other does not interfere with the operation or the process, that is, the inkjet heads 4R, 4G, 4B and the alignment camera 8. Is moved out of the printing area or maintenance area below and moved to the retracted position. The ink jet printing apparatus shown in FIG. 1 shows a state where both the suction table 6 and the maintenance table 10 are waiting at the retracted position, and shows a state immediately before the printing operation or the maintenance process.

  In the ink jet printing apparatus according to the present embodiment, the surface of the ink jet heads 4R, 4G, and 4B is prevented from being dried in the alignment process or the like on the suction table 6 of the substrate 7 to prevent the occurrence of non-ejection that causes printing failure. In addition, the inkjet heads 4R, 4G, and 4B are configured to always eject ink at a low frequency except during the printing operation.

  In the ink jet printing apparatus according to the present embodiment, the ink heads 4R, 4G, and 4B are each provided with an ink pan 12 that can store ink in order to eject ink at a low frequency. Each ink pan 12 is configured to be inserted by the ink pan moving mechanism 13 directly below the ejection portion of each inkjet head 4R, 4G, 4B from a direction orthogonal to the substrate transport direction.

  FIG. 2 is a perspective view showing a state in which each ink pan 12 is inserted directly under the discharge site of each ink jet head 4R, 4G, 4B by the ink pan moving mechanism 13 in the ink jet printing apparatus of the present embodiment. Thus, since the ink pan 12 is configured to be inserted immediately below the inkjet heads 4R, 4G, and 4B, the ink pan 12 is designed to be as thin as possible, and the position level where the substrate transport mechanism 1 is provided. The position level on which the substrate 7 is placed is not separated. As a result, the ink jet printing apparatus according to the present embodiment has a structure in which the occurrence of pitching and rolling is prevented in the suction table 6 transported by the substrate transport mechanism 1.

  In order to design the ink pan 12 to be thin, a material such as a stainless steel thin plate, an aluminum plate, a plastic, or the like is used to form a box shape or a reinforcing rib to have a lightweight and rigid structure. In the ink jet printing apparatus according to the present embodiment, each ink pan moving mechanism 13 is illustrated as being supported and fixed to the first and second reinforcing frames 2A and 2B having high rigidity of the ramen structure. You may fix to the base 3 directly.

  The materials of the reinforcing frames 2A, 2B, 2C, the fixed frame 5 and the base 3 are made from structural members such as general structural rolled steel, cast steel, iron-based materials including cast iron, stone, ceramic, carbon fiber reinforced resin, etc. Is appropriately selected in consideration of the balance between printing accuracy and cost. In addition, it is preferable that the structural parts that are substantially integrated are made of the same material so that thermal deformation is constant.

The reinforcing frames 2A, 2B, 2C, and the fixed frame 5 made of a material selected from the structural members described above may be configured by permanently connecting the members by welding, or by fastening with bolts. Or you may comprise by integral molding by casting and shaping | molding. In the ink jet printing apparatus of the present invention, the structure of the reinforced frames 2A, 2B, 2C provided with the ink jet heads 4R, 4G, 4B and the alignment camera 8 may be a so-called ramen structure.
Further, in the ink jet printing apparatus of the present invention, the structure of the reinforced frames 2A, 2B, 2C provided with the ink jet heads 4R, 4G, 4B and the alignment camera 8 is configured so as to be a so-called truss structure and strengthened. It is also possible to increase the rigidity of the frames 2A, 2B, 2C.

  In the ink jet printing apparatus of the present embodiment, an air slide, a rolling linear bearing or the like is assumed as a guide system mechanism of the substrate transport mechanism 1 and the maintenance unit moving mechanism 11, and a linear motor is known as a past drive system. It is assumed that the motor is driven by a ball screw or the like, and is appropriately selected from these mechanisms in consideration of specifications and the like. Of these, the combination of the air slide and the linear motor has the advantage that the guide and the linear motor can be shared, and FIG. 1 is illustrated assuming that combination.

  In the ink jet printing apparatus according to the present embodiment, although not shown, the maintenance unit 9 is composed of a plurality of caps that divide the surfaces of the ink jet heads 4R, 4G, and 4B into small areas and tightly seal them. A purge mechanism including a cap group and a vacuum pump for sucking ink by evacuating the cap, and a wipe mechanism for wiping off ink adhering to the ink jet head surface after the purge operation by the purge mechanism is required. It is the structure provided according to it.

  In the ink jet printing apparatus of the present embodiment configured as described above, it is necessary to print using a plurality of types of ink, and even when a plurality of ink jet heads are provided, the ink can be quickly dried. Even if it is high, it has a configuration in which a plurality of alignment cameras and a plurality of inkjet heads are directly supported and fixed to an integrated reinforcing frame having a rigid frame structure. The ink jet printing apparatus of the present embodiment configured as described above can secure the attachment rigidity of the ink jet heads 4R, 4G, and 4B, and can realize high printing accuracy.

  In addition, since the inkjet printing apparatus according to the present embodiment is provided with the maintenance unit moving mechanism 11 that can move the maintenance unit 9 in the same direction as the substrate conveyance direction, the ramen of an integrated reinforced frame that supports and fixes the inkjet head and the like. Maintenance processing can be performed without impairing the rigidity of the structure, and a reliable maintenance processing can be easily performed while maintaining high printing accuracy.

  Further, in the ink jet printing apparatus according to the present embodiment, in the case of ink having extremely high quick drying properties, the ink pan movement in which the ink pan 12 is inserted directly below the ink jet heads 4R, 4G, 4B from the direction intersecting the substrate transport direction. Since the mechanism 13 is provided, ink can be ejected from the inkjet heads 4R, 4G, and 4B into the ink pan at a low frequency during a standby time other than the printing operation and the maintenance process. Drying of 4G and 4B can be prevented, and high print quality can be maintained.

  In the ink jet printing apparatus according to the present embodiment, the example in which the ink pan 12 is provided as a measure for preventing the surface of the ink jet heads 4R, 4G, and 4B from being dried has been described. However, the ink quick drying property is not high. The ink pan 12 may not be provided. In this case, the cap of the purge mechanism provided in the maintenance unit 9 is used to seal the surfaces of the inkjet heads 4R, 4G, and 4B, thereby preventing drying even when printing is not performed for a long time. .

  In the inkjet printing apparatus of the present invention, the small and light ink pan 12 may be inserted at the shortest distance only when the maintenance unit is heavy and has a long moving distance and the moving time cannot be ignored. As the drive system mechanism of the ink pan moving mechanism 13, a servo motor is desirable in order to perform an insertion operation and a retracting operation as fast as possible.

  Further, in the ink jet printing apparatus according to the present embodiment, the ink jet heads 4R, 4G, and 4B have been described as being provided with the maintenance unit 9 and the maintenance unit moving mechanism 11 for maintenance processing. The maintenance unit 9 and the maintenance unit moving mechanism 11 are particularly required when periodic maintenance processing by the purge mechanism and the wipe mechanism is not necessary due to the characteristics of the ink used and the ink jet head, such as when the ejection is recovered only by the operation. There is no. The ink discarding operation may be configured to be discharged to the ink pan 12 or may be configured to be discharged to an ink pan provided separately on the side surface of the suction table 6.

  In the ink jet printing apparatus of the present embodiment, the alignment camera 8 has a beam portion of the third reinforcing frame 2C different from the first and second reinforcing frames 2A, 2B to which the ink jet heads 4R, 4G, 4B are fixed. However, if possible in design, it may be supported and fixed to the beam portion of the reinforced frame to which the inkjet head is fixed. Alternatively, the inkjet head and the alignment camera may be supported and fixed to the same casing, and the casing may be supported and fixed to the beam portion of the reinforcing frame.

  In order to perform the alignment process of the substrate 7, it is necessary to move and rotate the suction table 6 with a moving shaft and a rotating shaft perpendicular to the substrate transport direction. In the above-described embodiment, The illustration of the mechanism for performing the moving operation and the rotating operation as described above is omitted.

  The ink used in the ink jet printing apparatus of this embodiment is assumed to be, for example, three types of red (R), green (G), and blue (B). 9. In each example, the number of ink pans 12 is three. However, the necessary number of ink pans 12 may be provided depending on the purpose of manufacturing the substrate 7. In short, the ink jet head is fixed to a reinforcing frame having a rigid frame structure integrated with the base 3. As a result, the landing accuracy of the ink is increased and an excellent effect is exhibited.

  In the present embodiment, the case where there are four alignment cameras 8 is shown as an example. However, if there are at least two alignment cameras, there is an effect. However, using three or more increases the redundancy and makes it possible to further increase the alignment accuracy.

  Specifications such as the shape and dimensions of the pillars and beams of the integrated reinforced frame that fixes the inkjet heads 4R, 4G, 4B and the alignment camera 8 are the number and weight of the inkjet heads 4R, 4G, 4B and the alignment camera 8. Is set as appropriate. The point is that the reinforcement frame for fixing the inkjet heads 4R, 4G, and 4B and the alignment camera 8 may be configured so that a strong ramen structure can be constructed together with the base 3.

  In the inkjet printing apparatus of the present embodiment, since the substrate transport mechanism 1 and the maintenance unit moving mechanism 11 are assumed to be an air guide and a linear motor, both share the same moving mechanism, but another guide system mechanism and another A drive system mechanism can also be applied to the present invention. In short, any mechanism may be used as long as the moving direction is the same and the suction table 6 and the maintenance unit 9 can be arranged exclusively directly under the inkjet heads 4R, 4G, and 4B.

  The inkjet heads 4R, 4G, 4B and the alignment camera 8 have been described as being supported and fixed to the reinforced frame. However, when the initial positioning is performed or maintenance is performed less frequently, the inkjet heads 4R, 4G, 4B and the alignment camera 8 rotate vertically You may provide the adjustment mechanism which can adjust the direction. However, it goes without saying that a lock mechanism that is securely fixed is provided after adjustment.

  In the ink jet printing apparatus according to the present embodiment, in order to prevent drying, ink is ejected to the ink pan 12 at a low frequency during a non-printing operation and a non-maintenance process, but at the same frequency as the high ejection frequency during printing. The ink may be ejected to the ink pan 12. However, in order to minimize the amount of ink consumed during standby, it is desirable that the ink be ejected at a minimum frequency that does not dry.

  Although the base 3 shown in FIG. 1 is illustrated as an integrated type, when the substrate to be printed becomes large, it is necessary to consider the transportation of the equipment. In this case, the base can be divided within the maximum transportable width. Also good. In the case of dividing the base, for example, if the base portion for supporting and fixing the reinforcing frame including the ink jet head and the alignment camera is divided into the base portion on which the maintenance unit stands by, the ink jet head, the alignment camera and the suction that require accuracy are required. The relative positional accuracy of the table can be kept high, and even if the assembled base is used, the printing accuracy is not adversely affected. Further, the base portion on which the suction table stands by may be divided.

  In the ink jet printing apparatus according to the present embodiment, the reinforced frame to which the ink jet heads 4R, 4G, 4B and the alignment camera 8 are fixed has been described as a rigid rigid frame structure. Is also possible.

  Further, in the inkjet printing apparatus of the present embodiment, the configuration in which the reinforced frames 2A, 2B, and 2C arranged side by side are coupled by the fixed frame 5 is shown, but the reinforced frames 2A, 2B, and 2C are more reinforced by the truss structure. It is also possible to bond firmly. FIG. 3 is a perspective view of an ink jet printing apparatus showing an example in which the reinforced frames 2A, 2B, and 2C arranged side by side are firmly fixed by a truss structure. As shown in FIG. 3, in the reinforced frames 2A, 2B, and 2C that fix the inkjet heads 4R, 4G, and 4B and the alignment camera 8, between the first reinforced frame 2A and the second reinforced frame 2B, and the second The truss frame 16 is provided obliquely between the reinforcing frame 2B and the third reinforcing frame 2C, and the reinforcing frames 2A, 2B, 2C are more firmly coupled. By using the truss structure in this way, it becomes possible to apply a plurality of types of inks with high quick-drying simultaneously and with high accuracy as in the case of the ink jet printing apparatus of the embodiment shown in FIG. It is possible to further improve the landing accuracy of a plurality of types of inks on a large-sized substrate and form a pattern with high accuracy.

  The ink jet printing apparatus of the present invention can apply a plurality of types of high-drying inks with high accuracy at the same time and can easily carry out maintenance of the ink jet head, so that a liquid crystal display, a plasma display panel, an organic EL display, etc. In addition to these display devices, the present invention can be applied to various electronic device manufacturing applications that employ an inkjet system that performs circuit formation by printing, for example, and is a highly versatile printing device.

DESCRIPTION OF SYMBOLS 1 Substrate conveyance mechanism 2A 1st reinforcement | strengthening frame 2B 2nd reinforcement | strengthening frame 2C 3rd reinforcement | strengthening frame 3 Base 4R Inkjet head 4G Inkjet head 4B Inkjet head 5 Fixed frame 6 Suction table 7 Substrate 8 Alignment camera 9 Maintenance unit 10 Maintenance table DESCRIPTION OF SYMBOLS 11 Maintenance unit moving mechanism 12 Ink pan 13 Ink pan moving mechanism 14 Pillar part 15 Beam part 16 Truss frame

Claims (3)

A substrate transport mechanism for supporting and transporting the substrate on the substrate placement surface of the suction table;
A plurality of inkjet heads arranged in parallel in the substrate transport direction and for discharging ink onto the substrate transported by the substrate transport mechanism;
A base on which the substrate transport mechanism is supported and fixed, the base being parallel to the substrate transport direction and having both side surfaces orthogonal to the substrate placement surface of the suction table and serving as both sides of the substrate transport path ;
A plurality of reinforcing frames that are fixed to the both side surfaces of the base and that disperse and support the plurality of inkjet heads;
A plurality of fixed frames for fixing each of the plurality of reinforcing frames to connect each other;
A plurality of alignment cameras that are supported and fixed to the reinforcing frame, and for positioning the substrate before pattern formation on the substrate;
A maintenance unit for performing maintenance of the inkjet head;
A maintenance unit moving mechanism for moving a maintenance table on which the maintenance unit is supported and fixed, and
The maintenance unit moving mechanism has a moving shaft in the same direction as the substrate transfer mechanism, the maintenance unit and the suction table directly below the inkjet head is characterized Rukoto configured to be exclusively arranged Inkjet printing device. An ink pan that receives ink ejected from the inkjet head directly under the ejection site of the inkjet head;
An ink pan moving mechanism for moving the ink pan between a position immediately below the discharge portion of the inkjet head and a retracted position;
The ink pan moving mechanism inserts the ink pan directly under the ejection portion of the inkjet head from a direction orthogonal to the substrate transport direction while the inkjet head is waiting, and ejects ink from the inkjet head to the ink pan. The inkjet printing apparatus according to claim 1, wherein the inkjet printing apparatus is configured to cause the inkjet printing apparatus to perform .   The reinforcing frame is composed of pillar portions fixed to both side surfaces of the base, which are both sides of the substrate transport path, and beam portions provided between the pillar portions and extending in a direction perpendicular to the substrate transport direction. The inkjet printing apparatus according to claim 1, wherein the inkjet head is supported and fixed to the beam portion.

Images