Head unit and inkjet printing apparatus including it

Abstract

An inkjet printing apparatus is disclosed, comprising: a stage; and a head unit including a head and an ejection unit, the head including a nozzle for supplying ink, and the ejection unit ejecting the ink onto the stage, wherein the ejection unit includes: an ejection portion defining an ejection groove for ejecting the ink, a first fastening groove surrounding the ejection groove, and a first alignment groove disposed between the first fastening groove; an alignment clamp including a second fastening groove and a second alignment groove, at least a portion of the second fastening groove overlapping the first fastening groove, and the second alignment groove overlapping the first alignment groove; and a metal fastener inserted into the first alignment groove and the second alignment groove.

Description

Technical Field

[0001] This invention relates to inkjet printing apparatus, and more specifically, to an inkjet printing apparatus with an easily replaceable head unit. Background Technology

[0002] For display devices, a circuit element layer containing transistors and a display element layer connected to the transistors and containing light-emitting elements can be formed on a working substrate through multiple deposition and patterning processes. At this point, an inkjet printing apparatus can be used to fabricate a layer containing organic materials. Summary of the Invention

[0003] Technical problems to be solved

[0004] The present invention aims to provide an inkjet printing apparatus that improves the alignment characteristics of the printing head and facilitates the replacement of the printing head unit.

[0005] Solution

[0006] The inkjet printing apparatus of the present invention includes: a stage on which a substrate is disposed; and a head unit disposed on the stage and including a head and an ejection unit, the head including a nozzle for supplying ink, and the ejection unit connected to the head and ejecting ink onto the stage, wherein the ejection unit includes: an ejection section defining an ejection groove for ejecting ink, a first fastening groove surrounding the ejection groove, and a first alignment groove disposed between the first fastening groove; an alignment clamp including a second fastening groove and a second alignment groove, at least a portion of the second fastening groove overlapping the first fastening groove, and the second alignment groove overlapping the first alignment groove; and a metal fastener inserted into the first alignment groove and the second alignment groove.

[0007] The metal fastener may include a first metal fastener and a second metal fastener, wherein the diameter of the first metal fastener is larger than the diameter of the second metal fastener.

[0008] The second fastening groove can overlap with the first fastening groove at the corner of the adjacent spray section in the first fastening groove.

[0009] The spray section and the alignment clamp can be joined together by a second fastening groove and a bolt that is connected to the first fastening groove in the first fastening groove and overlaps with the second fastening groove.

[0010] The head and the spraying part can be joined together by bolts that are connected to the first fastening groove, which is in addition to the first fastening groove that overlaps with the second fastening groove.

[0011] The alignment fixture may include: a base, on which a second fastening groove and a second alignment groove are defined; and a support extending between the spray channels, wherein a spray opening exposing the spray channels is defined between the base and the support.

[0012] The spray section may include: a body section that contacts the head; a flow limiting section; and a filter section disposed between the body section and the flow limiting section.

[0013] The main body may have a main body groove forming a spray groove, and the filter may have a filter groove forming a spray groove. The main body groove and the filter groove may be aligned along the thickness direction of the spray section by a metal fastener.

[0014] Each of the body tank and the filter tank may include: a first group arranged in a first direction; and a second group spaced apart from the first group in a second direction intersecting the first direction and arranged in the first direction.

[0015] The flow restriction section may include: a first opening that extends in a first direction and exposes a first group; and a second opening that is spaced apart from the first opening in a second direction and extends in the first direction and exposes a second group.

[0016] Beneficial effects

[0017] According to the inkjet printing apparatus of the present invention, since it includes a through-alignment clamp and a metal fastener that engages with an alignment groove defined on the nozzle, the additional process for aligning the groove included in the nozzle can be omitted when performing a nozzle replacement operation.

[0018] Therefore, an inkjet printing apparatus that shortens operation time and improves print quality can be provided. Attached Figure Description

[0019] Figure 1 This is a simplified perspective view of an inkjet printing apparatus according to an embodiment of the present invention.

[0020] Figure 2 This is a simplified cross-sectional view of the head unit according to an embodiment of the present invention.

[0021] Figure 3 This is a perspective view of an assembly of the spraying unit according to an embodiment of the present invention.

[0022] Figure 4a This is an exploded perspective view of a spraying unit according to an embodiment of the present invention.

[0023] Figure 4b This is an exploded perspective view of the spray section according to an embodiment of the present invention.

[0024] Figure 5 This is an enlarged cross-sectional view of a portion of an alignment fixture according to an embodiment of the present invention.

[0025] Figure 6It is a flowchart showing the replacement operation of an ejection unit according to an embodiment of the present invention.

[0026] Figure 7 It is a combined perspective view of a lower jig and an ejection unit according to an embodiment of the present invention.

[0027] Figure 8 It is an exploded perspective view of a lower jig and an ejection unit according to an embodiment of the present invention.

[0028] Description of reference numerals

[0029] IE: Inkjet printing device

[0030] WB: Support plate

[0031] ST: Table

[0032] SM: Column

[0033] HU: Head unit

[0034] HD: Head

[0035] OU: Ejection unit

[0036] OF: Base portion

[0037] FI: Filter portion

[0038] RT: Flow rate limiting portion

[0039] BS: Substrate

[0040] 200: Ink ejection groove

[0041] 300, 400: Metal fasteners Detailed description of the embodiments

[0042] In this specification, when referring to a certain component (or region, layer, part, etc.) "on another component", "connected to another component", or "combined with another component", it means that it is directly arranged / connected / combined on another component, or a third component may also be arranged between them.

[0043] The same reference numerals refer to the same components. In addition, in the drawings, the thickness, ratio, and dimensions of the components are enlarged for effective illustration of the technical content.

[0044] "And / or" includes all of more than one combination that can define the relevant components.

[0045] The terms "first," "second," etc., can be used to describe various constituent elements, but the constituent elements are not limited to these terms. These terms are merely intended to distinguish one constituent element from another. For example, without departing from the scope of this invention, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element. Unless the context clearly indicates otherwise, singular expressions include plural expressions.

[0046] In addition, terms such as "below," "lower side," "above," and "upper side" are used to describe the relationships between the components shown in the accompanying drawings. These terms are relative concepts and are described based on the directions shown in the accompanying drawings.

[0047] Unless otherwise defined, all terms (including technical and scientific terms) used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Furthermore, terms identical to those defined in commonly used dictionaries should be interpreted as having the same meaning as in the context of the relevant art, and should not be construed as having an idealized or overly formal meaning unless explicitly defined herein.

[0048] Terms such as “comprising” or “having” are intended to specify the presence of features, numbers, steps, operations, constituent elements, components, or combinations thereof described in the specification, and should be understood as not precluding the presence or additional possibility of one or more other features, numbers, steps, operations, constituent elements, components, or combinations thereof. Hereinafter, embodiments of the invention are described with reference to the accompanying drawings.

[0049] Figure 1 This is a simplified perspective view of an inkjet printing apparatus according to an embodiment of the present invention. Figure 2 This is a simplified cross-sectional view of the head unit according to an embodiment of the present invention.

[0050] See Figure 1 According to an embodiment of the present invention, an inkjet printing apparatus IE may include a support plate WB, a stage ST, a pillar SM, a head fixing part HB, and a head unit HU. A substrate BS may be arranged on the stage ST.

[0051] The support plate WB provides space for arranging other structures of the inkjet printing apparatus IE. The stage ST can be arranged on the support plate WB and move along the first direction DR1. At this time, the stage ST can move between multiple columns SM and pass through the head unit HU. The stage ST can reciprocate along the first direction DR1.

[0052] Although not shown, the support plate WB may also include multiple conveying units for moving the stage ST back and forth in the second direction DR2 or in the third direction DR3. Furthermore, the support plate WB may include a conveying unit for rotating the stage ST, and the structure of the support plate WB is not limited to this embodiment; any structure capable of conveying the stage ST is acceptable.

[0053] Multiple columns PL can be arranged on the support plate WB, extending in the third direction DR3 and spaced apart from each other in the second direction DR2. Head fixing parts HB are attached to the multiple columns PL, and the head fixing parts HB can fix multiple head units HU to the support plate WB.

[0054] Although not shown, multiple columns PL can be arranged at the edge of the support plate WB and move in the first direction DR1 or in the upper / lower direction along the third direction DR3 to adjust the spacing in the third direction DR3 between the stage ST and the head unit HU, and are not limited to any one embodiment.

[0055] The head fixing part HB can be fixed to the column PL, which extends in a second direction DR2 horizontally to the stage ST. The head fixing part HB can arrange and fix multiple head units HU on the support plate WB. According to one embodiment, the head fixing part HB can be omitted, and it is not limited to any embodiment.

[0056] Multiple head units HU can be configured and attached to the head fixing part HB. The head units can be replaced individually and can be detached from the support plate WB as a whole when removing the head fixing part HB from multiple posts PL. The head unit HU can supply ink to the substrate BS arranged on the stage ST.

[0057] The substrate BS described in this invention can be provided in a state prior to the formation of an organic-containing layer among multiple layers arranged on a conventional display panel. Then, as ink PI ejected from the head unit HU is printed onto the substrate BS, an organic-containing layer can be formed on the substrate BS.

[0058] The organic substance according to one embodiment may include at least one of polyimide, polyethylene naphthalate, polyethylene terephthalate, polyarylate, polycarbonate, polyetherimide, and polyethersulfone.

[0059] The aforementioned common display panel can be any of the following: liquid crystal display panel, plasma display panel, electrophoretic display panel, microelectromechanical system display panel, electrowetting display panel, and light emitting display panel. When the display panel DD is a light emitting display panel, the light-emitting element can be any of the following: organic light-emitting element and nano-LED (light emitting diode), and is not limited to any particular embodiment. In this invention, the inkjet printing apparatus IE can be used to form the organic-containing layer among the multiple layers comprised of the aforementioned display panel, but is not limited to any particular embodiment.

[0060] See Figure 2 The head unit HU may include a head HD and an ejection unit OU. The head HD may provide space for storing ink PI and may include a nozzle NZ for supplying ink PI to the ejection unit OU.

[0061] The head HD may include various configurations for supplying ink PI from the head HD to the jetting unit OU via the nozzle NZ. For example, the head HD may include: a sensor capable of measuring the amount of ink PI, a sensor capable of adjusting the jetting pressure / speed / concentration, and a valve capable of adjusting the flow of ink PI, but is not limited to any one embodiment.

[0062] The ejection unit OU is arranged at the lower part of the head HD. The ejection unit OU may include multiple slots as described below. The ink PI provided by the head HD can be uniformly ejected onto the substrate BS through the multiple slots provided on the ejection unit OU.

[0063] The injection unit OU can be bolted to the head HD, and after use, it can be replaced with a new injection unit OU, or removed / attached from the head HD to remove foreign objects. The injection unit OU is described in detail below.

[0064] Figure 3 This is a perspective view of an assembly of the spraying unit according to an embodiment of the present invention. Figure 4a This is an exploded perspective view of a spraying unit according to an embodiment of the present invention. Figure 4bThis is an exploded perspective view of the spray section according to an embodiment of the present invention.

[0065] See Figure 3 and Figure 4a The spray unit OU according to the present invention may include a spray section OF, an alignment clamp OS, a bolt 100, and metal fasteners 300 and 400.

[0066] The upper part of the nozzle OF can be connected to the head HD (see...) Figure 2 The lower part of the nozzle OF is joined together. The nozzle OF may be defined with a first fastening groove 150, a spray groove 200, and first alignment grooves 350 and 450. The first alignment grooves 350 and 450 may include a first large alignment groove 350 and a first small alignment groove 450.

[0067] The first fastening groove 150, the spray groove 200, and the first alignment grooves 350 and 450 can be formed by the inner surface of the spray portion OF, which is exposed to the outside by extending through the third direction DR3. The inner surface of the spray portion OF forming the first fastening groove 150 can be provided with a spiral-shaped protrusion so that the bolt 100 can be engaged with the first fastening groove 150.

[0068] The spray trough 200 can be a trough used to spray ink PI supplied by the head HD.

[0069] The nozzle OF can be detached / attached from the alignment fixture OS by bolts 100. The four first fastening slots in the first fastening slots 150 of the nozzle OF, near the corners of the nozzle OF, can be holes for inserting bolts 100 that connect the nozzle OF and the alignment fixture OS.

[0070] The alignment fixture OS may include a base SB and a support SS. The base SB may include a short side SC extending in a first direction DR1 and a long side SL connected to the short side SC and extending in a second direction DR2. The short side SC may be defined as a side shorter than the long side SL.

[0071] The base SB may be defined with a second fastening groove 150-OS and second alignment grooves 350-OS and 450-OS. The second fastening groove 150-OS and the second alignment grooves 350-OS and 450-OS may be formed by the inner surface of the base SB that extends through the base SB along a third direction DR3 and is exposed to the outside. The second alignment grooves 350-OS and 450-OS may include a second large alignment groove 350-OS and a second small alignment groove 450-OS. The second large alignment groove 350-OS may overlap with the first large alignment groove 350, and the second small alignment groove 450-OS may overlap with the first small alignment groove 450.

[0072] Around the second fastening groove 150-OS and the second alignment grooves 350-OS and 450-OS, there may be an initial hole OS-H formed during the formation of the second fastening groove 150-OS and the second alignment grooves 350-OS and 450-OS.

[0073] The second fastening groove 150-OS can overlap with the four first fastening grooves in the first fastening groove 150 that are adjacent to the corner of the spray section OF, and a spiral-shaped protrusion can be provided on the inner surface of the base SB that constitutes the second fastening groove 150-OS in order to fasten the bolt.

[0074] The second alignment grooves 350-OS and 450-OS can overlap with the first alignment grooves 350 and 450. In this invention, the second alignment grooves 350-OS and 450-OS can have different diameters.

[0075] The support portion SS can be arranged between the long sides SL of the base SB. The support portion SS can extend in the first direction DR1 and does not overlap with the spray groove 200 of the spray portion OF. The support portion SS can be connected to the short side SC and spaced apart from the long side SL, thereby defining the spray opening portion OS-OP.

[0076] Since the ejection opening OS-OP does not overlap with the ejection groove 200, when ink PI is ejected onto the substrate BS through the ejection section OF, the ink PI can be ejected onto the substrate BS without interference from the support section SS. Furthermore, since the support section SS supports the ejection section OF, it prevents the ejection section OF from sagling in the third direction DR3.

[0077] The first fastening groove 150, excluding the four first fastening grooves at the corners adjacent to the nozzle OF, may not overlap with the nozzle opening OS-OP. Therefore, an additional bolt (not shown) can be inserted into the nozzle opening OS-OP to connect the nozzle OF to the head HD.

[0078] See Figure 4b The spray section OF of the present invention may include a body section OC, a filter section FI, and a flow limiting section RT stacked along the third direction DR3. The filter section FI may be arranged between the body section OC and the flow limiting section RT.

[0079] The upper part of the body OC can be connected to the head HD (see Figure 2 The lower part of the contact is ) . The body part OC may be defined with a first-1 fastening groove 151, a body groove 201 and a first-1 alignment groove 351, 451.

[0080] The first-1 fastening groove 151, the body groove 201, and the first-1 alignment grooves 351 and 451 can be formed by the inner surface of the body portion OC, which is exposed to the outside by the body portion OC extending along the third direction DR3. The inner surface of the body portion OC constituting the first-1 fastening groove 151 can be provided with a spiral-shaped protrusion so that the bolt 100 can be engaged with the first-1 fastening groove 151.

[0081] The filter section FI may be defined with a first-second fastening groove 152, a filter groove 202, and a first-second alignment groove 352, 452.

[0082] The first and second fastening grooves 152, the filter groove 202, and the first and second alignment grooves 352 and 452 can be formed by the inner surface of the filter section FI, which is exposed to the outside by passing through the filter section FI along the third direction DR3. The inner surface of the filter section FI constituting the first and second fastening groove 152 can be provided with a spiral-shaped protrusion so that the bolt 100 can be engaged with the first and second fastening groove 152.

[0083] The flow limiting part RT may include the first-third fastening groove 153, the opening RT-OP1, RT-OP2 and the first-third alignment groove 353, 453.

[0084] The first-third fastening groove 153, openings RT-OP1 and RT-OP2, and first-third alignment grooves 353 and 453 can be formed by the inner surface of the flow-limiting portion RT, which is exposed to the outside by the flow-limiting portion RT extending along the third direction DR3. The inner surface of the flow-limiting portion RT constituting the first-third fastening groove 153 can be provided with a spiral-shaped protrusion so that the bolt 100 can be engaged with the first-third fastening groove 153.

[0085] The corresponding slots in the first-1 fastening slot 151, the first-2 fastening slot 152 and the first-3 fastening slot 153 can overlap each other on the third-direction DR3.

[0086] Figure 4a The first fastening groove 150 of the spray section OF described herein can be composed of a first-1 fastening groove 151, a first-2 fastening groove 152, and a first-3 fastening groove 153. Therefore, bolts 100 that are fastened to the alignment clamp OS can be inserted into the first-1 fastening groove 151, the first-2 fastening groove 152, and the first-3 fastening groove 153 that are aligned with each other on the third direction DR3.

[0087] The corresponding slots in the first-1 alignment slots 351, 451, the first-2 alignment slots 352, 452, and the first-3 alignment slots 353, 453 can overlap each other on the third-direction DR3.

[0088] Figure 4aThe first alignment slots 350 and 450 described herein can be composed of first-1 alignment slots 351 and 451, first-2 alignment slots 352 and 452, and first-3 alignment slots 353 and 453.

[0089] More specifically, the first large alignment groove 350 may be composed of the first-1 large alignment groove 351, the first-2 large alignment groove 352 and the first-3 large alignment groove 353, and the first small alignment groove 450 may be composed of the first-1 small alignment groove 451, the first-2 small alignment groove 452 and the first-3 small alignment groove 453.

[0090] Therefore, the metal fasteners 300 and 400 fastened to the alignment clamp OS can be inserted into the first-1 alignment slots 351 and 451, the first-2 alignment slots 352 and 452, and the first-3 alignment slots 353 and 453 that are aligned with each other on the third direction DR3.

[0091] The corresponding slots in the main body slot 201 and the filter slot 202 on the third-direction DR3 can overlap each other. Figure 4a The spray tank 200 described herein can be composed of a body tank 201 and a filter tank 202.

[0092] Since the diameters of the body groove 201 and filter groove 202 constituting the spray groove 200 are relatively smaller than those of other grooves, when the body groove 201 and filter groove 202 are not aligned on the third-direction DR3, ink PI cannot be coated at the target position on the substrate BS, and an uneven layer may be formed.

[0093] In this embodiment, the body groove 201 defined on the body part OC and the filter groove 202 defined on the filter part FI can be respectively divided into a first group of H1 arranged in the first direction DR1 and a second group of H2 arranged in the second direction DR2, which is spaced apart from the first group of H1 and arranged in the first direction DR1.

[0094] In the openings RT-OP1 and RT-OP2 of the flow restriction section RT, the first opening RT-OP1 can expose the first group of H1, and the second opening RT-OP2 can expose the second group of H2.

[0095] See again Figure 4a The metal fasteners 300 and 400 may include a first metal fastener 300 and a second metal fastener 400.

[0096] The first metal fastener 300 can pass through the base SB of the alignment clamp OS and be attached to the first large alignment groove 350 of the nozzle OF. When the first metal fastener 300 is inserted into the first large alignment groove 350 and the second large alignment groove 350-OS, the first metal fastener 300 can be inserted into the first large alignment groove 350 and the second large alignment groove 350-OS without any gap space.

[0097] The second metal fastener 400 can penetrate the base SB of the alignment clamp OS and engage with the first small alignment groove 450 of the nozzle OF. When the second metal fastener 400 is inserted into the first small alignment groove 450 and the second small alignment groove 450-OS, the second metal fastener 400 can be inserted into the first small alignment groove 450 and the second small alignment groove 450-OS without any gap space.

[0098] In this embodiment, the diameter of the first metal fastener 300 can be larger than the diameter of the second metal fastener 400. Figure 4a Although two metal fasteners 300 and 400 with different diameters are shown, this is not a limitation; more than three metal fasteners can be provided, and this is not limited to any one embodiment.

[0099] According to the inkjet printing apparatus IE of the present invention, since it includes metal fasteners 300 and 400 that pass through the alignment clamp OS and engage with the first alignment grooves 350 and 450 defined on the nozzle OF, the additional process of aligning the body groove 201 of the body part OC included in the nozzle OF and the filter groove 202 included in the filter part FI can be omitted when changing the nozzle OF. This provides an inkjet printing apparatus IE that shortens operation time and improves print quality.

[0100] Figure 5 This is an enlarged cross-sectional view of a portion of an alignment fixture according to an embodiment of the present invention. For... Figures 1 to 4b Structures identical or similar to those described herein shall use the same or similar reference numerals, and repeated descriptions shall be omitted.

[0101] Figure 5 This simply illustrates the metal fastener 310 and... Figure 4a A cross-sectional view showing the relationship between the base SB of the alignment clamp OS. The metal fastener 310 according to this embodiment can be applied to… Figure 4a and Figure 4b The metal fasteners 300, 400 and the alignment clamp OS described herein.

[0102] According to one embodiment, the base SB of the alignment fixture OS may include a washer SR. The washer SR may be disposed in the initial hole OS-H.

[0103] In one embodiment, the metal fastener 310 may include a handle portion 31, a first fixing portion 32, a second fixing portion 33, and a third fixing portion 34 arranged sequentially along a third direction DR3.

[0104] The handle portion 31 can be arranged at the lower part of the base SB. The first fixing portion 32 can be inserted into the interior of the base SB, and the second fixing portion 33 can be engaged with the base SB by means of a washer SR. The third fixing portion 34 can protrude from the base SB and engage with either of the first alignment grooves 350 and 450 of the spray portion OF.

[0105] According to this embodiment, since the metal fastener 310 is engaged with the washer SR provided on the base SB, it can be stably engaged with the alignment jig OS. Therefore, the alignment characteristics of the spray groove 200 of the spray section OF can be improved.

[0106] Figure 6 This is a flowchart illustrating the replacement operation of the injection unit according to an embodiment of the present invention. Figure 7 This is a perspective view of the combination of the lower clamp and the spraying unit according to an embodiment of the present invention. Figure 8 This is an exploded perspective view of the lower clamp and the injection unit according to an embodiment of the present invention. (For...) Figures 1 to 4b Structures identical or similar to those described herein shall use the same or similar reference numerals, and repeated descriptions shall be omitted.

[0107] Figure 6 It is a simple description of what is aimed at Figure 2 The flowchart described in the document outlines the process of replacing the head HD with the injection unit OU. Figure 7 and Figure 8 This is a diagram illustrating the additional lower clamp required when performing a replacement operation for the injection unit OU.

[0108] See Figure 6 The replacement sequence of the injection unit OU can be as follows: disassembling the old injection unit, installing the new injection unit, and confirming the alignment of the spray nozzles. In the replacement steps of the injection unit OU of this invention, the steps of installing the small metal fastener and the large metal fastener can be omitted, and for ease of explanation, in... Figure 6 The flowchart is represented by dashed lines.

[0109] During the disassembly of the old injection unit, it can be removed from the head HD. Figure 3 Bolt 100 and other bolts (not shown) fastened to the first fastening groove 150.

[0110] In the step of installing the new injection unit, the new injection unit OU, which combines the spray section OF and the alignment clamp OS, can be attached to the head HD. At this time, bolts can be inserted into the first fastening groove 150 and the second fastening groove 150-OS and tightened to install the injection unit OU onto the head HD.

[0111] Then, determine whether the spray nozzle 200 is aligned. If it is aligned, the replacement is completed. If the spray nozzle 200 is not aligned, the replacement operation of the new spray unit OU is repeated.

[0112] When fixing the spray section OF to the head HD without using the alignment clamp OS, an additional step may be required to align the body groove 201 and filter groove 202 that constitute the spray groove 200 using metal fasteners 300 and 400.

[0113] According to the present invention, the body groove 201 and filter groove 202 constituting the spray trough 200 can be aligned by metal fasteners 300 and 400. In the aligned state, the spray part OF is attached to the alignment fixture OS by bolts 100, thereby performing the replacement operation. This eliminates the need for the additional step of aligning the spray trough 200 by metal fasteners 300 and 400.

[0114] See Figure 7 and Figure 8 When combining the nozzle OF with the alignment fixture OS, the lower fixture OZ can be used.

[0115] The lower clamp OZ may include a bottom ZB, a column ZS, and a support ZU. The bottom ZB provides a plane for arranging the column ZS. The support ZU is arranged on the column ZS opposite to the bottom ZB. A space is formed between the support ZU and the bottom ZB by the height of the column ZS in the third direction DR3. This space provides room for arranging bolts 100 and metal fasteners 300 and 400.

[0116] Before attaching the nozzle OF to the alignment clamp OS, the alignment clamp OS can be fixed to the lower clamp OZ with the bolts 100 and metal fasteners 300 and 400 attached to it. The nozzle OF can be attached to the alignment clamp OS with the lower clamp OZ attached to it.

[0117] While the preferred embodiments of the present invention have been described above, those skilled in the art or those of ordinary skill in the art should understand that modifications and alterations can be made without departing from the spirit and technical scope of the invention as set forth in the appended claims.

[0118] Therefore, the technical scope of the present invention is not limited to the contents described in the specification, but depends on the claims.

Claims

1. An inkjet printing apparatus, comprising: A platform on which a substrate is arranged; as well as A head unit, disposed on the stage, includes a head and an ejection unit. The head includes nozzles for supplying ink, and the ejection unit is connected to the head and ejects the ink onto the stage. The injection unit includes: The ejection section has an ejection groove defined on it for ejecting the ink, a first fastening groove surrounding the ejection groove, and a first alignment groove disposed between the first fastening grooves. An alignment fixture includes a second fastening groove and a second alignment groove, wherein at least a portion of the second fastening groove overlaps with a first fastening groove, and the second alignment groove overlaps with the first alignment groove; and The first metal fastener and the second metal fastener are respectively inserted into the first alignment groove and the second alignment groove, and are spaced apart from each other across the spray channel. The diameters of the first metal fastener and the second metal fastener are different from each other.

2. The inkjet printing apparatus according to claim 1, wherein, The second fastening groove overlaps with the first fastening groove in the first fastening groove, which is located near the corner of the spray section.

3. The inkjet printing apparatus according to claim 2, wherein, The spray nozzle and the alignment clamp are joined together by the second fastening groove and a bolt that is connected to the first fastening groove in the first fastening groove and overlaps with the second fastening groove.

4. The inkjet printing apparatus according to claim 3, wherein, The head and the spray section are joined together by bolts that engage with a first fastening groove in the first fastening groove, except for the first fastening groove that overlaps with the second fastening groove.

5. The inkjet printing apparatus according to claim 1, wherein, The alignment fixture includes: The base, wherein the base is defined with the second fastening groove and the second alignment groove; and The support extends between the spray nozzles. A spray opening is defined between the base and the support portion to expose the spray groove.

6. The inkjet printing apparatus according to claim 1, wherein, The ejection section includes: The main body contacts the head; Traffic restriction department; and A filter section is arranged between the main body section and the flow restriction section.

7. The inkjet printing apparatus according to claim 6, wherein, The main body portion is defined with a main body groove that constitutes the spray groove. The filter section defines a filter groove that constitutes the spray channel, and The main body groove and the filter groove are aligned along the thickness direction of the spray section by the first metal fastener and the second metal fastener.

8. The inkjet printing apparatus according to claim 7, wherein, Each of the body tank and the filter tank includes: The first group is arranged in the first direction; and The second group is spaced apart from the first group in a second direction that intersects the first direction and is arranged in the first direction.

9. The inkjet printing apparatus according to claim 8, wherein, The flow restriction unit includes the following: A first opening extends along the first direction and exposes the first group; as well as The second opening is spaced apart from the first opening in the second direction and extends along the first direction to expose the second group.

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