JP2013006359A - Platen unit and method of injecting liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately guarantee the height position of a platen.SOLUTION: A platen unit includes a support member, a platen support member disposed on the support member, having an inner space, and having a first engagement part having a first abutment face, a platen disposed on the platen support member, made of a resin and having a second engagement part having a second abutment face, and a seal member disposed between the platen support member and the platen, wherein an elastic projection is formed on any one of the first engagement part and the second engagement part, and when the platen support member engages with the platen, the elastic projection is deformed and the first abutment face and the second abutment face are pressed.

Description

  The present invention relates to a platen unit and a liquid ejecting method.

  2. Related Art Inkjet printers that use ink to form an image on a medium are used. Such an ink jet printer includes a platen for supporting a medium. The platen appropriately maintains the distance between the head that ejects ink and the medium by appropriately supporting the medium.

  Patent Document 1 and Patent Document 2 show a platen for supporting a sheet during printing. Patent Document 3 discloses a large format printer that performs printing on a wide paper sheet.

JP 2010-214880 A JP 2000-289290 A JP 2009-279780 A

However, in the case of a large format printer (also referred to as a large-format ink jet printer) as in Patent Document 3, it is difficult to form a wide platen with a single platen member. Therefore, one platen is constituted by a plurality of platen members. However, if the platen members are constituted by a plurality of platen members, it is difficult to align the heights accurately between the platen members. If the heights cannot be accurately aligned, a step occurs in the paper width direction, and the paper may not be properly conveyed or the paper may not be properly sucked on the platen.
In addition, since the distance between the head and the medium is not uniform, the image quality is also affected. Therefore, it is desired to guarantee the height position of the platen with high accuracy.

  The present invention has been made in view of such circumstances, and an object thereof is to guarantee the height position of the platen with high accuracy.

The main invention for achieving the above object is:
A support member;
A platen support member provided on the support member and having an internal space, the platen support member having a first engagement portion having a first contact surface;
A platen provided on the platen support member and formed of resin, the platen having a second engagement portion having a second contact surface;
A seal member provided between the platen support member and the platen;
With
An elastic protrusion is provided on one of the first engagement part and the second engagement part, and the elastic protrusion is deformed when the platen support member and the platen are engaged, and the first contact It is a platen unit by which a surface and the said 2nd contact surface are pressed.

  Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

1 is a perspective view of an inkjet printer 1 in the present embodiment. It is an internal side view of the inkjet printer 1 in this embodiment. It is a perspective view of the platen unit 30 in this embodiment. It is a front view of the 1st platen 31A and the 1st platen base 32A in this embodiment. It is a top view of the platen unit 30 in this embodiment. FIG. 3 is a cross-sectional view of the platen unit 30 along AA. FIG. 7A is a first enlarged view of the plate-like hook-like member 311 and the protruding portion 321 in the present embodiment, and FIG. 7B is a second enlarged view of the plate-shaped hook-like member 311 and the protruding portion 321 in the present embodiment. FIG. It is explanatory drawing of an electric field when platen 31 'is insulated. It is explanatory drawing of an electric field when the platen 31 is earth | grounded.

At least the following matters will become clear from the description of the present specification and the accompanying drawings. That is,
A support member;
A platen support member provided on the support member and having an internal space, the platen support member having a first engagement portion having a first contact surface;
A platen provided on the platen support member and formed of resin, the platen having a second engagement portion having a second contact surface;
A seal member provided between the platen support member and the platen;
With
An elastic protrusion is provided on one of the first engagement part and the second engagement part, and the elastic protrusion is deformed when the platen support member and the platen are engaged, and the first contact It is a platen unit by which a surface and the said 2nd contact surface are pressed.
By doing so, the elastic protrusion is deformed and the first contact surface and the second contact surface come into contact with each other, so that the height position of the platen constituted by the platen and the platen support member is High accuracy can be guaranteed.

In this platen unit, the first contact surface has a normal in the same direction as the normal of the surface of the medium passing through the upper part of the platen, and the second contact surface is the same as the normal It is desirable to have a direction normal.
By doing so, it is possible to guarantee the height position of the platen constituted by the platen and the platen support member by contacting the first contact surface and the second contact surface parallel to the surface of the medium. .

The platen support member includes a contact portion for contacting the support member at a bottom portion of the platen support member, and the contact portion is in contact with the first contact surface and the second contact surface. It is desirable to be provided at a position that overlaps the portion and the intersecting direction intersecting the transport direction of the medium.
By doing so, the support member and the platen support member come into contact with each other through the contact portion to ensure the height accuracy of the platen support member, and the first contact surface of the platen and the second contact of the platen support member. The height formed by the platen support member and the platen in contact with the surface can also be accurately guaranteed. Since the contact portion is provided at a position that overlaps the contact portion between the first contact surface and the second contact surface in the crossing direction, these positions approach, so the height from the platen to the support member is increased. It can be guaranteed with higher accuracy.

Further, the seal member is provided continuously between the platen support member and the platen, and the first engagement portion is provided to protrude outside the platen support member in the medium transport direction, The second engagement portion is provided to protrude outside the platen in the transport direction, and at least one of the first engagement portion and the second engagement portion straddles the seal member, and the first engagement portion The joining portion and the second engaging portion are preferably in contact with each other outside the seal member.
By doing so, the first contact surface and the second contact surface are brought into contact with each other while the airtightness between the platen and the platen support member is ensured by the seal member, and the platen and the platen support member are configured. It is possible to guarantee the height position of the platen to be made with high accuracy.

The support member, the platen support member, and the platen are preferably formed of a conductive material.
By doing so, even when the platen is charged by friction between the platen and the medium, the charge is discharged to the support member via the first contact surface, the second contact surface, and the contact portion. be able to.

The platen and the platen support member are preferably molded from a conductive resin.
By doing in this way, the platen and platen support member with a complicated shape can be manufactured by injection molding.

The seal member is preferably a conductive sponge.
In this way, even when the platen is charged by friction between the platen and the medium, electric charges can be discharged via the platen, the conductive sponge, and the platen support member.

In addition, at least the following matters will become clear from the description of the present specification and the accompanying drawings. That is,
A head for ejecting liquid onto a medium;
A support member;
A platen support member provided on the support member and having an internal space, the platen support member having a first engagement portion having a first contact surface;
A platen provided on the platen support member and formed of resin, the platen having a second engagement portion having a second contact surface;
A seal member provided between the platen support member and the platen;
With
An elastic protrusion is provided on one of the first engagement part and the second engagement part, and the elastic protrusion is deformed when the platen support member and the platen are engaged, and the first contact A liquid ejecting apparatus in which a surface and the second contact surface are pressed.
By doing so, the elastic protrusion is deformed and the first contact surface and the second contact surface come into contact with each other reliably. Therefore, the height position of the platen constituted by the platen and the platen support member is set. High accuracy can be guaranteed. Since the distance between the medium transported on the platen and the head can be maintained with high accuracy, the liquid can be landed at a desired position on the medium with high accuracy.

=== Embodiment ===
FIG. 1 is a perspective view of an ink jet printer 1 in the present embodiment. As shown in the figure, the ink jet printer 1 is mounted on the recording unit 40 with the longitudinal direction horizontally arranged, a casing 90 mounted on the end of the recording unit 40, and an upper side of the recording unit 40. The loading unit 10 and a leg unit 70 that supports the recording unit 40 and the housing 90 from below are provided.

  Inside the loading unit 10, a roll assembly 11 including a roll R on which a long recording medium (refer to FIG. 2; hereinafter, also referred to as “medium”) is wound is loaded. The solid 11 (see FIG. 2) is covered with a roll cover 12. The recording unit 40 has its internal mechanism covered with a top cover 42 and a front cover 44. A head 41 (see FIG. 2), which will be described later, is disposed inside the recording unit 40, and ink is ejected onto the medium drawn from the roll R of the loading unit 10 and fed to the recording unit 40. Is formed.

  The medium on which the image is formed in the recording unit 40 is discharged to the outside from a discharge unit 60 formed below the recording unit 40. The leg portion 70 is attached for the purpose of preventing the medium that has passed through the discharge portion 60 from coming into contact with the floor surface.

  The housing 90 forms a home position space where the head retracted from the recording unit 40 stands by, and has a cartridge holder 20 at the lower portion thereof. An ink cartridge (not shown) that contains ink to be supplied to the head is mounted on the cartridge holder 20 inside a holder cover 22 that covers the surface of the cartridge holder 20.

  An operation panel 80 is disposed on the upper surface of the housing 90. In addition to the plurality of switches 82 operated by the user, the operation panel 80 also includes a display unit 84 that indicates the operation state of the ink jet recording apparatus 1. Accordingly, the user operates the inkjet printer 1 from the front side with the side on which the operation panel 80 and the cartridge holder 20 are disposed as the front side.

FIG. 2 is an internal side view of the inkjet printer 1 in the present embodiment.
As shown in FIG. 2, the inkjet printer 1 includes a spindle 13 that holds a roll R, a conveyance path 14 that conveys the roll paper R, a recording unit 40 that performs image formation on a conveyed medium, A discharge unit 60 that discharges the medium that has undergone image formation and a cutter device 61 that shears the medium discharged from the discharge unit 60 are provided. The ink jet printer 1 includes a platen unit 30 that supports a conveyed medium at a lower portion of a head 41 described later. The platen unit 30 includes a platen 31, a platen base 32 (corresponding to a platen support member), and a support member 33. The detailed configuration of the platen unit 30 will be described later. Further, the ink jet printer 1 includes a control unit (not shown) that comprehensively controls the operation of each component device.

  In the following description, the medium transport direction (discharge direction) is the X-axis direction, the width direction of the transport path 14 perpendicular to the X-axis direction (the direction perpendicular to the paper surface in FIG. 2) is the Y-axis direction, and the X-axis direction. The vertical direction perpendicular to the Y-axis direction is sometimes referred to as the Z-axis direction.

  The recording unit 40 includes a head 41 that ejects ink onto a medium conveyed along the conveyance path 14. The head 41 is mounted on a carriage 43 that is movable in the width direction of the transport path 14. The head 41 includes a plurality of nozzle rows, and is configured to eject ink of a predetermined color (for example, yellow (Y), magenta (M), cyan (C), and black (K)) from each nozzle row. ing. The head 41 performs image formation for recording information such as a predetermined image and characters by ejecting ink onto the recording surface of the roll paper R supported by the platen 31.

  The medium on which the image is formed by the recording unit 40 is discharged from the discharge unit 60 through the nip portion 50 that constitutes the terminal portion of the transport path 14. The nip portion 50 includes a plurality of discharge rollers 51 that nip and rotate the medium to discharge the medium. The discharge roller 51 includes a mechanism for switching a roller for nipping depending on the paper type to a jagged roller 51a or a roller roller 51b.

  A cutter device 61 that shears the discharged medium to a predetermined size is provided on the downstream side of the nip portion 50. The cutter device 61 includes a regulating member 62 that regulates the height position of the discharged medium, and a cutter unit that moves in the width direction (Y-axis direction) orthogonal to the medium discharge direction (X-axis direction) to shear the medium. 63.

  FIG. 3 is a perspective view of the platen unit 30 in the present embodiment. FIG. 3 shows a platen 31, a platen base 32, and a support member 33 as a minimum configuration constituting the platen unit 30 of the present embodiment. FIG. 3 is a perspective view of a part of the platen unit 30 in order to facilitate the description of the configuration of the platen unit 30.

  FIG. 4 is a front view of the first platen 31A and the first platen base 32A in the present embodiment. The platen 31 and the platen base 32 are each composed of a plurality of members. Of these, the first platen 31A and the first platen base 32A are shown. 4 is a view when the first platen 31A and the first platen base 32A are viewed from the X-axis plus side to the minus side in FIG. 2, but this angle when attached to the inkjet printer 1 is shown. Cannot be seen from. Here, for the sake of explanation, these are shown in a state of being taken out from the ink jet printer 1.

  Hereinafter, the outline of the platen unit 30 will be described with reference to these drawings. The support member 33 is a member for supporting the platen base 32 at the upper part thereof. The platen base 32 includes a first platen base 32A, a second platen base 32B, and a third platen base 32C (not shown in FIG. 3).

  Although these platen bases have different lengths in the paper width direction (Y direction), the other configurations have substantially the same configuration, and therefore, here, the first platen base 32A will be mainly described as an example. I do. A first platen 31A, a second platen 31B, and a third platen 31C are provided above the first platen base 32A, the second platen base 32B, and the third platen base 32C. The first platen 31A, the second platen 31B, and the third platen 31C also have different lengths in the paper width direction (Y direction), but the other configurations have almost the same configuration. The first platen 31A will be described as an example.

  Both the platen 31 and the platen base 32 are injection-molded with a conductive resin. The reason why the conductive resin is used is to allow the static electricity generated in the platen 31 to escape. Moreover, the reason why the air discharge resin was not used is that the air discharge resin is easily worn, and it is impossible to ensure a high precision platen height accuracy over a long period of time.

  Also, the reason why the platen 31 was not manufactured is that the shape of the platen 31 is complicated, so there are many processes in punching the sheet metal material, and even if it is manufactured with sheet metal, it is difficult to perform high-precision processing. Because.

  The bottom portion of the first platen base 32A includes a plurality of bottom opening portions 322. As shown in FIG. 4, the bottom opening 322 protrudes from the bottom surface of the platen base 32 </ b> A and has a shape that fits into the opening of the support member 33 (described later). The internal space of the first platen base 32A communicates with the internal space of the support member 33. Similarly, the other platen bases also have a bottom opening 322 communicating with the support member 33. Therefore, the internal space of the first platen base 32A, the internal space of the second platen base 32B, and the internal space of the third platen base 32C are The air is movably communicated.

  The first platen 31A is fitted into a part of the upper portion of the first platen base 32A by sliding in the Y axis plus direction. Although not shown in FIG. 3, the second platen 32B is also fitted adjacent to the first platen 31A. Thereby, at least a part of the first platen 31A is provided on the first platen base 32A, and the second platen 31B is provided on the first platen base 32A and the second platen base 32B. And the height of the edge part of the 1st platen 31A which adjoins on the 1st platen base 32A, and the edge part of the 2nd platen 31B can be arrange | equalized.

  In particular, since a large-sized inkjet printer 1 as shown in FIG. 1 is long in the paper width direction, a platen unit is configured by using a platen unit with a plurality of platen bases and a plurality of platens as described above. However, when a platen unit is constituted by a plurality of platens, if there is a step between them, there is also a problem that the medium to be conveyed floats at that location. Further, if a step is generated, air leaks there, and there is a possibility that the medium is not properly sucked in the platen. This becomes an obstacle to the conveyance of roll paper that is frequently used particularly in the large-format ink jet printer 1. However, with the configuration of the present embodiment as described above, the height of the end of the first platen 31A and the end of the second platen 31B can be made uniform, so that no step is generated between them. can do.

  The first platen 31A is provided with a support surface 312 for supporting the medium to be transported and a groove 313 for preventing liquid such as discarded ink from coming into contact with the medium being transported. The groove portion is provided with a first suction hole 314 that serves both as ink suction and medium suction. The first suction hole 314 penetrates from the upper part of the first platen 31A to the lower part (Z-axis direction). Further, the first platen 31A is provided with a plurality of second suction holes 315 and third suction holes 316 on the support surface 312 that supports the medium to be conveyed.

  A stretched and continuous sponge 34A (corresponding to a seal member) is provided around the upper edge of the first platen base 32A. The first platen base 32A is provided with a plurality of protrusions 321 (corresponding to the first engaging portion) protruding in the medium conveyance direction (X-axis direction) (of course, the direction opposite to the medium conveyance direction (X Similarly, a protrusion 321 is also provided in the negative axis direction).

  The first platen 31A is provided with a plurality of hook-shaped members 311 (corresponding to the second engaging portions) for engaging with the protruding portions 321. These hook-shaped members 311 are provided so as to straddle the sponge 34A of the first platen base 32A in the X-axis direction when the first platen 31A is attached to the first platen base 32A. That is, it is provided so as to protrude outside the first platen base 32A. The hook-shaped members 311 and the protrusions 321 are provided at the same pitch in the paper width direction, and the plurality of hook-shaped members 311 engage with the corresponding protrusions 321 respectively.

  A plurality of contact portions 325 are provided at the bottom of the first platen base 32 </ b> A so as to contact the support member 33. The center of some of the contact portions 325 of the plurality of contact portions 325 is perforated, and the first platen base 32A is fixed to the support member with a fastening member such as a screw through the perforation holes. Further, these contact portions 325 overlap with a portion (contact portion) where a contact surface (described later) of the protrusion 321 and a contact surface of the hook-shaped member 311 contact in the paper width direction (Y-axis direction). Provided in position. By doing so, the distance between the contact portion 325 and the contact surface can be reduced, and the height from the platen to the support member can be more accurately guaranteed.

  FIG. 5 is a top view of the platen unit 30 in the present embodiment. FIG. 6 is a cross-sectional view of the platen unit 30 taken along the line AA. FIG. 5 shows that the platen 31 includes a first platen 31A, a second platen 31B, and a third platen 31C. It is also shown that the lengths of these platens in the paper width direction are different from each other. However, the number of platens for constituting the platen unit is not limited to this. Further, the length of the platen in the paper width direction is not limited to this.

  In FIG. 6, the first platen base 32A, the second platen base 32B, and the third platen base are provided on the support member 33, and the first platen 31A, the second platen 31B, and the third platen are further provided thereon. It is shown that 31C is provided.

  The first platen base 32A, the second platen base 32B, and the third platen base 32C are fitted into the opening 332 of the support member 33 through the bottom opening 322. The lengths of the first platen base 32A, the second platen base 32B, and the third platen base 32C in the paper width direction (Y-axis direction) are different.

  A suction device 38 is provided at the center bottom of the support member 30. The suction device 38 keeps the air pressure in the internal space lower than the external air pressure by discharging the air in the internal space formed by the platen 31, the platen base 32, and the support member 33 to the outside of the platen unit 30. Thereby, the medium conveyed on the platen 31 is adsorbed to the platen through the first suction hole 314, the second suction hole 315, and the third suction hole 316 described above. By doing so, the medium is adsorbed on the flat platen, so that the flat surface of the medium is secured. Then, ink droplets can be ejected onto the medium maintained flat. For this reason, since the distance between the head and the medium can be kept uniform in the paper width direction and the transport direction, ink droplets can be landed at desired positions to provide a printed matter with good image quality.

  As described above, the extended and continuous sponge 34A is provided around the upper edge of the first platen base 32A. Similarly, a stretched and continuous sponge 34B is also provided around the upper edge of the second platen base 32B, and a stretched and continuous sponge 34C is also provided around the upper edge of the third platen base 32C. These sponges are compressed in the vertical direction (Z-axis direction) when the hook-shaped member 311 is engaged with the protrusion 321 and the platen is fixed. That is, since the sponge is deformed and adheres closely to the platen base and the platen, the airtightness between the platen base and the platen can be improved.

  FIG. 7A is a first enlarged view of the hook-shaped member 311 and the protrusion 321 of the platen 31 in the present embodiment, and FIG. 7B is a second view of the hook-shaped member 311 and the protrusion 321 of the platen 31 in the present embodiment. FIG. Here, the engagement between the hook-shaped member 311 and the protrusion 321 will be described with reference to FIGS. 7A and 7B.

  7A and 7B show a protrusion 321 and a contact surface 3211 of the protrusion 321 (corresponding to a first contact surface). In these drawings, a tip portion 3111 of the hook-shaped member 311 and a triangular elastic projection 3112 (corresponding to an elastic projection) provided on the tip portion 3111 are shown. Further, in these drawings, a contact surface 3113 (corresponding to a second contact surface) of the hook-shaped member 311 that contacts the contact surface 3211 of the protrusion 321 is shown. The normal line of the contact surface 3211 of the protrusion 321 matches the normal line of the support surface 312. Further, the normal line of the contact surface 3113 of the hook-shaped member 311 also coincides with the normal line of the support surface 312.

  Each platen is slid on the platen base 32 in the paper width direction (Y-axis plus direction), so that the hook-shaped member 311 of the platen 32 engages with the protrusion 321 of the platen base 32. When the protrusion 321 is fitted into the hook-shaped member 311, the triangular elastic protrusion 3112 is elastically deformed. The contact surface 3211 of the protrusion 321 is reliably pressed against the contact surface 3113 of the hook-shaped member 311 by the pressing force due to this elastic deformation.

  In this way, the contact surface 3211 of the protrusion 321 and the contact surface 3113 of the hook-shaped member 311 are reliably in contact with each other, whereby the height of the support surface 312 of the platen 31 from the contact portion 325 of the platen base 32. Is guaranteed at the design height. In particular, since the normal line of the contact surface 3211 of the protrusion 321 and the normal line of the contact surface 3113 of the hook-shaped member 311 coincide with the normal line of the support surface 312, the contact surfaces 3113 and 3211 are defined as above. By ensuring contact with the configuration, the plane of the support surface 312 through which the medium passes can be guaranteed.

  Further, since a plurality of hook-like members 311 and protrusions 321 are provided in the paper width direction, the height of the support surface 312 of the platen 31 from the contact portion 325 of the platen base 32 is made uniform over the entire area in the paper width direction. Can do.

  FIG. 8 is an explanatory diagram of an electric field when the platen 31 'is insulated. In the figure, the platen 31 'and the nozzle plate NP' of the head 41 'are shown. A sheet S is shown as a medium conveyed on the platen.

  The head 41 'has the same potential as that of the main body via cables and is grounded. Therefore, the potential of the nozzle plate NP ′ is zero. On the other hand, when the platen 31 ′ is not grounded, static electricity is generated due to friction generated between the platen 31 ′ and the paper S when the paper S passes over the platen 31 ′.

  In particular, in the large-sized inkjet printer 1 as in the present embodiment, the wide paper S is mainly conveyed in the paper width direction. Further, in order to prevent the sheet S from floating from the platen 31 ′, the sheet S is sucked from the first suction hole 314 to the third suction hole 316. For this reason, the frictional force between the sheet S and the platen 31 'is large, and static electricity generated in the platen 31' is also large. In this way, if the platen 31 'is charged and the charge removal is not performed, a potential difference is generated between the head 41' and the nozzle plate NP ', and an electric field is generated.

  On the other hand, when the paper S passes, paper dust flies mainly from the end of the paper S. When this paper dust moves between electric fields, the individual paper dust is dielectrically polarized as shown in the figure. The dielectrically polarized paper powder is adsorbed to the platen 31 'or the nozzle plate NP'.

  The nozzle plate NP ′ is provided with nozzles (not shown), and ink is ejected from these nozzles. However, when paper dust is adsorbed to the nozzle plate NP ', the paper dust causes nozzle clogging. As a result, a nozzle that cannot eject ink is generated, and a desired dot is not formed in a pixel for which the nozzle is in charge of dot formation (so-called dot omission occurs).

  Nozzle cleaning is performed so that such dot omission does not occur. However, since cleaning is performed by forcibly ejecting ink from the nozzle, ink is wasted. In addition, there is a disadvantage that the amount of discharged waste liquid increases due to the forced ejection of ink. Therefore, it is desirable to prevent paper dust from adhering to the nozzle plate NP ′.

  FIG. 9 is an explanatory diagram of an electric field when the platen 31 is grounded. In consideration of the paper dust adhesion process as described above, it is desirable to suppress the charging of the platen 31. Therefore, the platen 31 in the present embodiment is grounded via the platen base 32 and the support member 33 with the above-described configuration (the support member 33 is set to the same potential as the inkjet printer 1).

  As described above, the platen 31 and the platen base 32 are formed of a conductive resin. The platen 31 and the platen base 32 have a structure in which the hook-shaped member 311 and the protruding portion 321 are reliably in contact with each other. In addition, the platen base 32 reliably contacts the support member 33 formed of sheet metal through the contact portion 325 each time.

  With such a configuration, the charge of the platen 31 can be released via the platen base 32 and the support member 33. Thereby, since an electric field is not generated between the nozzle plate NP and the platen 31 of the head 41, paper dust is hardly adsorbed to the nozzle plate NP. Thus, it is possible to provide the ink jet printer 1 in which dot dropout hardly occurs.

  Further, even in a form in which the sponge is inserted between the platen 31 and the platen base 32 in this way, the hook-like member 311 and the protruding portion 321 are reliably in contact with each other. Even when charged by the above, the charge can be released to the support member side through these contact surfaces.

  Further, when the individual platen bases are viewed as one unit, the contact surfaces of the hook-shaped member 311 and the protruding portion 321 are arranged at equal intervals in the paper width direction (Y-axis direction). Correspondingly, the contact portions 325 are also arranged at equal intervals. As a result, even if the platen 31 is charged by static electricity or the like, the charges are dispersed and quickly discharged through the contact surface and the contact portion 325.

  Furthermore, as described above, in the present embodiment, the positions at which the hook-shaped members 311 and the protrusions 321 are formed coincide with the positions at which the contact portions are formed in the paper width direction. For this reason, the path through which charges move from the platen 31 to the sheet metal 33 can be minimized, and charges can be released more quickly.

=== Other Embodiments ===
Although the above-described sponge has been described as a general sponge, a conductive sponge may be used. By doing so, the charge charged on the platen 31 can be released to the platen base 32 and the support member 33 through the conductive sponge.

  In the above-described embodiment, the printer 1 has been described as the liquid ejecting apparatus. However, the present invention is not limited to this, but other fluids other than ink (liquids, liquids in which particles of functional materials are dispersed, gels) Such a fluid can also be embodied in a liquid ejection device that ejects or ejects the fluid. For example, color filter manufacturing apparatus, dyeing apparatus, fine processing apparatus, semiconductor manufacturing apparatus, surface processing apparatus, three-dimensional modeling machine, gas vaporizer, organic EL manufacturing apparatus (especially polymer EL manufacturing apparatus), display manufacturing apparatus, film formation You may apply the technique similar to the above-mentioned embodiment to the various apparatuses which applied inkjet technology, such as an apparatus and a DNA chip manufacturing apparatus. These methods and manufacturing methods are also within the scope of application.

  The above-described embodiments are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

<About the head>
The method of ejecting ink is not limited to the method of ejecting using a piezoelectric element, and other methods such as a method of generating bubbles in the nozzle by heat may be used.

1 Inkjet printer,
10 loading section, 11 roll assembly, 12 roll cover, 13 spindle,
14 Transport path,
20 cartridge holder, 22 holder cover,
30 platen units, 31 platens,
31A 1st platen, 31B 2nd platen, 31C 3rd platen,
32A first platen base, 32B second platen base,
32C 3rd platen base,
33 support member,
34A sponge, 34B sponge, 34C sponge,
38 suction device,
40 recording unit, 41 head, 42 top cover,
43 Carriage, 44 Front cover,
50 discharge section, 51 discharge roller, 51a jagged roller, 51b roller roller,
60 discharge section, 61 cutter device, 62 regulating member, 63 cutter unit,
70 legs,
80 operation panel, 82 switch, 84 display section,
90 housing,
311 hook-shaped member, 312 support surface, 313 groove,
314 first suction hole, 315 second suction hole, 316 third suction hole,
321 protrusion, 322 bottom opening, 325 degree contact,
3111 Tip portion of hook-shaped member, 3112 elastic protrusion,
3113 contact surface of the platen, 3211 contact surface of the protrusion,
NP nozzle plate,
S paper,

Claims (8)

A support member;
A platen support member provided on the support member and having an internal space, the platen support member having a first engagement portion having a first contact surface;
A platen provided on the platen support member and formed of resin, the platen having a second engagement portion having a second contact surface;
A seal member provided between the platen support member and the platen;
With
An elastic protrusion is provided on one of the first engagement part and the second engagement part, and the elastic protrusion is deformed when the platen support member and the platen are engaged, and the first contact A platen unit in which a surface and the second contact surface are pressed.   The first contact surface has a normal in the same direction as the normal of the surface of the medium passing through the platen upper portion, and the second contact surface has a normal in the same direction as the normal. The platen unit according to claim 1. The platen support member includes a contact portion for contacting the support member at the bottom of the platen support member,
3. The platen unit according to claim 2, wherein the contact portion is provided at a position that overlaps a contact portion between the first contact surface and the second contact surface in an intersecting direction that intersects a transport direction of the medium. . The seal member is provided continuously between the platen support member and the platen,
The first engagement portion is provided to protrude outside the platen support member in the conveyance direction of the medium, and the second engagement portion is provided to protrude outside the platen in the conveyance direction.
The at least one of the first engagement portion and the second engagement portion straddles the seal member, and the first engagement portion and the second engagement portion are in contact with each other outside the seal member. The platen unit according to any one of?   The platen unit according to claim 1, wherein the support member, the platen support member, and the platen are formed of a conductive material.   The platen unit according to claim 5, wherein the platen and the platen support member are molded of a conductive resin.   The platen unit according to claim 1, wherein the seal member is a conductive sponge. A head for ejecting liquid onto a medium;
A support member;
A platen support member provided on the support member and having an internal space, the platen support member having a first engagement portion having a first contact surface;
A platen provided on the platen support member and formed of resin, the platen having a second engagement portion having a second contact surface;
A seal member provided between the platen support member and the platen;
With
An elastic protrusion is provided on one of the first engagement part and the second engagement part, and the elastic protrusion is deformed when the platen support member and the platen are engaged, and the first contact A liquid ejecting apparatus in which a surface and the second contact surface are pressed.

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