JP6241372B2 - Head unit and liquid ejection device - Google Patents

Description

  The present invention relates to a head unit and a liquid ejection device.

2. Description of the Related Art Conventionally, an ink jet recording apparatus that forms an image on a recording medium using a line head in which a plurality of ink jet heads are arranged in a staggered manner is known.
In addition to the inkjet head, the inkjet recording apparatus includes a drive circuit board for discharging ink from each head, wiring for power supply and signal transmission, piping for supplying ink to each head, and the like. As the number of inkjet heads increases, the weight increases.
The line head has a bridge-like structure in which long support members that support a plurality of inkjet heads are arranged so as to straddle the conveyance path of the recording medium. As a result, there is a risk of variations in the ejection direction of ink from each nozzle.

  In view of this, there has been proposed a mechanism that suppresses the bending of the base plate by forming a base plate to which a plurality of recording heads are attached such that the support wall portion and the flange portion are orthogonal to each other (see, for example, Patent Document 1). There has also been proposed a support frame in which three plate-like members parallel to each other are substantially orthogonal to a plate-like support member to which a plurality of head units are attached (see, for example, Patent Document 2).

JP 2013-212668 A JP 2008-246726 A

By the way, when exchanging the ink jet head, there is a case where work such as reconnection of wiring or piping is required. As the number of ink-jet heads mounted on the line head increases, the number of head replacements per line head increases, and therefore the number of operations such as wiring and piping reconnection increases.
However, in the case of the above-described Patent Document 1, since a support wall portion to which a plurality of recording heads are attached is provided below the flange portion, a space for removing each recording head is provided below the recording head, that is, In addition, there is a problem that workability is poor because the recording medium must be secured on the conveyance path side. Also, in the case of Patent Document 2, since the three flat plate-like members are provided below the plate-like support member, the same problem as described above occurs.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a head unit and a liquid discharge apparatus that can improve the workability of maintenance while suppressing the bending of a support member that supports a plurality of inkjet heads. And

In order to solve the above problems, the head unit according to the first aspect of the present invention provides:
A plurality of liquid discharge heads for discharging liquid from the lower portion, and a communication portion that is in communication with the liquid flow path is formed at the upper portion;
A long support member that supports the plurality of liquid discharge heads,
A reinforcing portion is provided on the upper surface of the supporting member along the longitudinal direction of the supporting member, and the plurality of liquid discharge heads are arranged in two rows along the longitudinal direction so as to sandwich the reinforcing portion. It is characterized by becoming.

The invention according to claim 2 is the head unit according to claim 1,
It is characterized by further comprising a common flow path provided above the plurality of liquid discharge heads and for supplying a liquid to each of the liquid discharge heads via the communication portion.

The invention described in claim 3 is the head unit according to claim 2,
The common flow path is arranged on one of the two rows of the liquid discharge head along the longitudinal direction.

The invention according to claim 4 is the head unit according to any one of claims 1 to 3,
A circuit board for driving the liquid discharge head is further provided above the liquid discharge head.

The invention according to claim 5 is the head unit according to claim 3,
A circuit board that is provided above the liquid discharge head and that drives the liquid discharge head;
The circuit board is arranged on the row side of the two rows of the liquid discharge heads along the longitudinal direction where the common flow path for supplying the liquid to each of the liquid discharge heads is not provided. It is characterized by being.

The liquid ejection device of the invention according to claim 6
A liquid ejection apparatus comprising a plurality of head units according to any one of claims 1 to 5,
The plurality of head units are juxtaposed substantially orthogonal to the longitudinal direction,
It is further characterized by further comprising a plurality of mounts provided so as to sandwich each of the plurality of head units in a direction substantially orthogonal to the longitudinal direction.

According to a seventh aspect of the present invention, in the liquid ejection device according to the sixth aspect,
A recording medium transport unit provided below the plurality of head units;
The head unit and the gantry are arranged so that the longitudinal direction is substantially orthogonal to the recording medium conveyance direction by the conveyance unit,
The liquid discharge head discharges ink onto a recording medium transported by the transport unit.

The liquid ejection device of the invention according to claim 8 is,
A liquid ejection apparatus comprising the head unit according to any one of claims 1 to 5,
A recording medium transport unit provided below the head unit;
The liquid discharge head discharges ink onto a recording medium transported by the transport unit.

  ADVANTAGE OF THE INVENTION According to this invention, the workability | operativity of a maintenance can be improved, suppressing the bending of the support member which supports a some inkjet head.

1 is a perspective view illustrating a schematic configuration of an ink jet recording apparatus according to an embodiment to which the present invention is applied. It is a perspective view which shows the head unit which comprises the line head which comprises the inkjet recording device of FIG. It is a perspective view which shows the head unit of FIG. It is a figure which shows typically the surface along the IV-IV line of the head unit of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a schematic configuration of an inkjet recording apparatus 100 according to an embodiment to which the present invention is applied.
In FIG. 1, the line head 20 constituting the ink jet recording apparatus 100 is schematically shown.

As shown in FIG. 1, an ink jet recording apparatus 100 forms an image by ejecting ink from above onto a transport apparatus 10 that transports a recording medium (not shown) in a predetermined direction and a transported recording medium. A plurality of (for example, 8) line heads 20 on which a plurality of inkjet heads 21b to be performed (see FIG. 2 and the like) are mounted, and a plurality of mounts 30 on which a person is placed during work such as maintenance. And a support base 40 for supporting them.
In the following description, the recording medium transport direction is the front-rear direction (sub-scanning direction), one direction orthogonal to the front-rear direction is the left-right direction (main scanning direction), and the direction orthogonal to the front-rear direction and the left-right direction is The direction.

The conveying device 10 includes a driving roller 11 and a driven roller (not shown), and an endless conveying belt 12 that is stretched between the driving roller 11 and the driven roller (not shown).
The driving roller 11 and the driven roller are arranged so as to extend in the left-right direction substantially orthogonal to the recording medium conveyance direction. Then, for example, the driving roller 11 is rotated by a conveying motor (not shown) attached to the driving roller 11 so that the conveying belt 12 circulates between the driving roller 11 and the driven roller and is placed on the upper surface thereof. On the other hand, the rotation of the driving roller 11 is stopped, and the conveyance belt 12 stops and the conveyance of the recording medium is stopped.
As the recording medium, for example, a resin film or a metal can be used in addition to paper and cloth.

For example, the support base 40 includes a support frame 41 extending along the front-rear direction.
Two support frames 41 are provided so as to sandwich the conveyor belt 12 in the left-right direction, and support the conveyor belt 12 via a driving roller 11 and a driven roller that are rotatably provided at both ends of each support frame 41. Yes.
Further, the two support frames 41, 41 support the plurality of line heads 20,... And the plurality of mounts 30,.

The plurality of line heads 20... And the plurality of mounts 30 are arranged adjacent to each other in a staggered manner in the front-rear direction. That is, the plurality of mounts 30 are provided so as to sandwich each line head 20 in the front-rear direction substantially orthogonal to the longitudinal direction.
Thereby, in each line head 20, maintenance of each part arrange | positioned in the conveyance direction downstream (front side), for example, replacement | exchange of the inkjet head 21b, supply piping 21f, and discharge piping 21g (refer FIG. 3 etc.). An operation such as reconnection can be performed by placing an operator on the gantry 30 disposed on the downstream side in the transport direction with respect to the line head 20.
Similarly, in each line head 20, a maintenance work for each part disposed on the upstream side (rear side) in the transport direction is performed on a platform on which the worker is disposed on the upstream side in the transport direction with respect to the line head 20. 30 can be performed.

Further, each of the plurality of line heads 20,... Has a head unit 21 that is long in the left-right direction on which a plurality of inkjet heads 21b,... Are mounted, and a pair of lifting mechanisms 22 that support the head units 21 so as to be movable up and down. , 22.
The plurality of line heads 20, for example, are Y (yellow), Lm (light magenta), Or (orange), M (magenta), Bk (black), Bl (blue), C (cyan), Lc. It is provided according to eight colors such as (light cyan). Further, these line heads 20 are arranged in the order of Y, Lm, Or, M, Bk, Bl, C, and Lc from the upstream side in the transport direction, for example.
Note that the color, arrangement order, number, and the like of the plurality of line heads 20 are merely examples, and are not limited thereto, and can be arbitrarily changed as appropriate.

The lifting mechanism 22 can arbitrarily adjust the distance between the recording medium on the conveyor belt 12 and the nozzles of the inkjet head 21b by moving the head unit 21 in the vertical direction. Thereby, the nozzle of the inkjet head 21b can be adjusted to a height suitable for image formation corresponding to various recording media having different thicknesses.
In the case where the inkjet recording apparatus 100 includes a maintenance device that forcibly sucks ink from the inkjet head 21b, discharges ink, wipes the nozzle surface, capping, moisturizes, etc., the head unit 21 is moved by the lifting mechanism 22. It can also be adjusted to a height corresponding to the maintenance device.

Next, the head unit 21 will be described in detail with reference to FIGS.
FIG. 2 is a perspective view showing the head unit 21 constituting the one line head 20 as viewed obliquely from the rear, and FIG. 3 is a perspective view showing the head unit 21 as seen from the oblique front. FIG. 4 is a diagram schematically showing a surface along the IV-IV line of the head unit 21.

  As shown in FIGS. 2 to 4, the head unit 21 includes a bowl-shaped frame portion 21 a connected to the lifting mechanism 22, and a plurality of (for example, 30) inkjet heads 21 b,. The support member 21c that supports the plurality of inkjet heads 21b,..., The plurality of (for example, 8) circuit boards 21d that drive the plurality of inkjet heads 21b,. A common flow path forming member 21e for forming a common flow path (not shown) to be supplied, a supply pipe 21f for supplying ink to the inkjet head 21b, a discharge pipe 21g for discharging ink from the inkjet head 21b, etc. Is installed.

The frame portion 21a includes two first beam members a1 and a1 whose both ends are connected to the corresponding lifting mechanisms 22, and four column members connected to the lower ends of the first beam members a1 and a1. are mainly provided with two upright wall members a4, a4 connected to the lower end portions of the column members a2,... and connected to the support member 21c.
The frame portion 21a is an aluminum member, for example. However, the frame portion 21a is an example and is not limited thereto, and the material of the frame portion 21a can be arbitrarily changed as appropriate.

The two first beam members a1 and a1 are disposed on the uppermost side of the frame portion 21a. The two first beam members a1 and a1 are long members that extend in the left-right direction, and are disposed at a predetermined interval in the front-rear direction.
Further, of the two first beam members a1 and a1, the common beam forming member 21e extends along the longitudinal direction of the first beam member a1 on either one of the front and rear directions (for example, the front side). Is installed. That is, the common flow path forming member 21e is provided above the inkjet head 21b supported by the support member 21c.

The common flow path forming member 21e forms a common flow path for distributing and supplying ink to each of the plurality of inkjet heads 21b,.
Specifically, although not shown in the drawings, the common flow path forming member 21e is a cylindrical member mainly extending in the left-right direction, and a cross section (common flow path forming member) orthogonal to the extending direction of the common flow path. 21e has a substantially circular shape.

In addition, a plurality of inkjet heads are provided on one side (for example, the rear side) of the common channel forming member 21e in a substantially central portion in the vertical direction and perpendicular to the extending direction of the common channel forming member 21e. A branch channel forming part e1 is provided (see FIG. 4; only one is shown) that forms a plurality of branch channels (not shown) for supplying ink to each of the 21b. The plurality of branch flow path forming portions e1,... Are juxtaposed along the extending direction of the common flow path forming member 21e.
Further, each of the plurality of branch flow path forming portions e1,... Is connected to the supply pipe 21f via an electromagnetic valve 21h (see FIG. 4) that switches between a state of blocking the flow path and a state of communication. The ink in the common flow path of the common flow path forming member 21e is an inkjet head through a plurality of branch flow path forming portions e1,... And corresponding supply pipes 21f in a state where the flow paths are communicated by the electromagnetic valve 21h. 21b is supplied.

In addition, an inflow passage forming portion e2 that forms an ink inflow passage (not shown) through which ink flows into the common flow passage is disposed at one end portion (for example, the left end portion) of the common flow passage forming member 21e in the left-right direction. (See FIG. 3). The inflow passage forming portion e2 is arranged on one end side (for example, the left side) from all of the plurality of branch flow passage forming portions e1,... And below the plurality of branch flow passage forming portions e1,. It is installed. In FIG. 3, the illustration of the piping for inflow of ink connected to the inflow passage forming portion e2 is omitted.
Further, an outflow path forming portion e3 that forms an ink outflow path (not shown) for flowing out the ink in the common flow path is provided at the other end (for example, the right end) in the left-right direction of the common flow path forming member 21e. (See FIG. 4). The outflow path forming portion e3 is disposed on the other end side (for example, the right side) from all of the plurality of branch flow channel forming portions e1,... And above the plurality of branch flow channel forming portions e1,. It is installed.

The four column members a2,... Are respectively connected to both end portions in the left-right direction of the two first beam members a1, a1. Each of the four column members a2,... Is erected in the vertical direction, and the upper end of each column member a2 is connected to the lower end surface of the first beam member a1.
Further, of the four column members a2,..., A substantially horizontal plate member a5 is bridged between the lower ends of the two column members a2, a2 on both the left and right sides.

  The long member a3 is a long member extending in the left-right direction, is attached to the two column members a2 on the rear side of both end portions in the left-right direction, and is substantially the same as the first beam member a1 on the rear side. It is arranged directly below. In addition, a board holding part a6 that holds the circuit board 21d is disposed above the long member a3.

A predetermined number (for example, 8) according to the number of circuit boards 21d is juxtaposed in the left-right direction. Moreover, the board | substrate holding | maintenance part a6 is a flat member, for example, and the circuit board 21d is screwed by the wide surface part of the back side. Moreover, the board | substrate holding | maintenance part a6 is attached to the two attachment members a7 and a7 so that attachment or detachment is possible at the both ends of the left-right direction.
The attachment member a7 is a columnar member that stands up and down, and spans the first beam member a1 and the long member a3. In addition, a groove-shaped guide (not shown) into which the end of the substrate holding part a6 is inserted is formed along the vertical direction on the inner part of the attachment member a7 on the substrate holding part a6 side. In the present embodiment, since the adjacent end portions of the two substrate holding portions a6 and a6 adjacent in the left-right direction are attached to one mounting member a7, the two substrate holding portions a6 and a6 are arranged. Are provided with three mounting members a7,.
When the circuit board 21d held by the board holding part a6 is exchanged, the board holding part a6 is inserted / removed in the vertical direction along the guide of the mounting member a7.

  In the present embodiment, one circuit board 21d is provided with drive circuits corresponding to the four inkjet heads 21b,..., But is not limited to this example. The number of drive circuits provided in 21d can be arbitrarily changed as appropriate. For example, one circuit board 21d may be provided for each inkjet head 21b, or may be provided for each of a plurality of inkjet heads 21b other than four.

The two upright wall members a4 and a4 are connected to the lower end of the column member a2 and to both end portions in the left-right direction via plate members a5. Specifically, a substantially horizontal plate-like connecting member (not shown) is provided on the upper part of the two standing wall members a4 and a4, and the connecting member and the plate member a5 are connected to each other. .
The two upright wall members a4 and a4 are, for example, substantially rectangular flat plate-like members, and are disposed so as to face each other in the left-right direction.
Further, a support member 21c that supports the plurality of inkjet heads 21b,... Is attached to the lower ends of the two standing wall members a4, a4.
Further, the long member a3 is attached to the column member a2 on the rear side of both ends in the left-right direction and extends in the left-right direction.

  As described above, the board holding portion a6 that holds the circuit board 21d is provided on the upper side with respect to the long member a3, and the plurality of inkjet heads 21b,... Below the column member a2 to which the long member a3 is attached. A support member 21c for supporting the above is provided. That is, the circuit board 21d is provided above the inkjet head 21b supported by the support member 21c.

In addition, although illustration is abbreviate | omitted, the pin which fits with the shaft hole of the corresponding plate member a5 is provided in either one of the connection members connected with the plate member a5. The two upright wall members a4, a4 to which the support members 21c for supporting the plurality of inkjet heads 21b,... Are attached are configured to be rotatable in the horizontal direction with the pin of the connecting member as an axis.
This makes it possible to adjust the relative horizontal angle of the plurality of inkjet heads 21b with respect to the conveyance direction of the recording medium by the conveyance device 10.

As shown in FIG. 4, the support member 21c includes, for example, a main support part c1 formed substantially horizontally, and a reinforcement part c2 provided on the upper surface of the main support part c1 and formed upright in the vertical direction. It has.
The support member 21c is an aluminum member, for example, but is not limited to this example, and the material of the support member 21c can be arbitrarily changed as appropriate.

The main support portion c1 is formed in a long shape so as to extend along the left-right direction, and has a flat plate shape that is substantially rectangular in plan view. Moreover, the main support part c1 is connected with the standing wall member a4 which the both ends of the left-right direction correspond respectively.
The reinforcing portion c2 has a flat plate shape having a predetermined thickness in the front-rear direction, and is disposed so as to be substantially orthogonal to the main support portion c1. Moreover, the reinforcement part c2 is formed in the length substantially equal to the main support part c1 along the left-right direction similarly to the main support part c1.

A plurality of inkjet heads 21b,... Are arranged on the upper surface of the main support portion c1 in a predetermined arrangement (for example, a staggered pattern) along the longitudinal direction. Specifically, the plurality of inkjet heads 21b,... Are arranged in two rows along the longitudinal direction of the support member 21c so as to sandwich the reinforcing portion c2 in the front-rear direction.
As shown in FIG. 4, above the plurality of ink jet heads 21b,..., Common to one of the two rows of the plurality of ink jet heads 21b,. A flow path forming member 21e is disposed, and a circuit board 21d is disposed on the other row side (for example, the rear side).

  Although not shown, the main support portion c1 is provided with openings corresponding to the respective ink jet heads 21b, and the nozzles of the ink jet heads 21b are exposed to the recording medium through the openings. ing.

Each inkjet head 21b is provided with an inlet (communication portion) b1 communicating with a supply pipe 21f and an ink chamber (not shown) at the top thereof. That is, the ink supplied from the common flow path of the common flow path forming member 21e through the branch flow path of the branch flow path forming portion e1 and the supply pipe 21f is supplied to the ink chamber (illustrated) of the inkjet head 21b via the inlet b1. Abbreviation).
In the present embodiment, the two inlets b1 are provided corresponding to the supply pipe 21f branched into two branches. However, the present invention is not limited to this example, and can be arbitrarily changed as appropriate.

Each inkjet head 21b is provided with an outlet (communication portion) b2 communicating with an ink chamber (not shown) and a discharge pipe 21g. That is, the ink in the ink chamber of the inkjet head 21b flows out through the discharge pipe 21g via the outlet b2.
The ink flowing out from the inkjet head 21b flows into, for example, a waste liquid tank communicated with the discharge pipe 21g and a mechanism for circulating ink (both not shown).

Each inkjet head 21b is provided with a plurality of nozzles (not shown) for discharging ink (liquid) at the lower portion thereof, and discharges ink from the plurality of nozzles to a recording medium conveyed on the conveyance belt 12. To do.
Although not shown, the inkjet head 21b is provided with a terminal for electrical connection with the circuit board 21d, and the inkjet head according to a signal from the circuit board 21d connected via the terminal. 21b is driven to perform an ink ejection operation.
The ink jet head 21b is a general head that ejects ink by an ink jet system except for the points described above, and a detailed description thereof will be omitted.

As described above, according to the ink jet recording apparatus 100 of the present embodiment, the head unit 21 is formed with the inlet b1 connected to the supply pipe 21f and the outlet b2 connected to the discharge pipe 21g at the top. A plurality of inkjet heads 21b that discharge ink from the lower part are supported by a long support member 21c, and a reinforcing portion c2 is provided on the upper surface of the support member 21c along the longitudinal direction. Since the heads 21b,... Are arranged in two rows along the longitudinal direction so as to sandwich the reinforcement part c2, the reinforcement part c2 can suppress the bending of the support member 21c, and a plurality of two rows are formed. Reinforcing parts for each row such as replacement of the ink jet heads 21b, ..., connection of the supply pipe 21f and the discharge pipe 21g, etc. It can be carried out from the second front side efficiently.
That is, among the two rows of the plurality of inkjet heads 21b,..., Work related to maintenance of the inkjet head 21b in one row (for example, the row on the downstream side in the transport direction) can be performed from one row side, Further, work related to maintenance of the inkjet head 21b in the other row (for example, the row on the upstream side in the transport direction) can be performed from the other row side. At this time, since the inkjet head 21b is supported on the upper surface of the support member 21c, it is not necessary to secure a space for removing the inkjet head 21b below the inkjet head 21b when replacing the inkjet head 21b. The workability of the exchange can be further improved. Further, since the inlet b1 and the outlet b2 are provided on the upper part of the ink jet head 21b, the connection of the supply pipe 21f connected to the inlet b1 and the discharge pipe 21g connected to the outlet b2 can be more efficiently performed. It is possible to improve the workability.
Therefore, even if the structure is provided with the reinforcing portion c2 so as to suppress the bending of the support member 21c that supports the plurality of inkjet heads 21b,..., Maintenance workability can be improved.

  Further, since a common flow path for supplying ink to each of the inkjet heads 21b via the inlet b1 is provided above the plurality of inkjet heads 21b,..., Communication with the common flow path and the inkjet head 21b is provided. It is possible to optimize the position where the supply pipe 21f to be routed is routed, and to change the supply pipe 21f more efficiently, thereby improving the workability. Can do. In particular, since the common flow path is arranged on either one of the two rows of the inkjet head 21b (for example, the row on the downstream side in the transport direction), the common flow path forming the common flow path Work related to maintenance of the forming member 21e can be efficiently performed from one row side.

  Further, since the circuit board 21d for driving the ink jet head 21b is provided above the ink jet head 21b, the circuit board 21d can be replaced more efficiently and the workability can be further improved. Can be made. In particular, the circuit board 21d is arranged on the side of the two rows of the inkjet head 21b where the common flow path is not provided (for example, the row on the upstream side in the transport direction), so that the circuit board 21d Work related to maintenance can be efficiently performed from the side opposite to the common flow path.

  Further, since the plurality of mounts 30 are provided so as to sandwich each of the plurality of head units 21 in the front-rear direction substantially orthogonal to the longitudinal direction, each line head 20 has a front side (downstream in the recording medium conveyance direction). For example, maintenance of each part arranged in the head), for example, replacement of the ink jet head 21b, reconnection of the supply pipe 21f and the discharge pipe 21g, and the like are arranged on the front side with respect to the line head 20. On the other hand, the maintenance work of each part arranged on the rear side (upstream side in the transport direction) can be performed on the rear side with respect to the line head 20. It can be carried out on the pedestal 30.

The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
For example, in the above embodiment, as the support member 21c, the main support portion c1 and the reinforcement portion c2 are separately formed. However, the support member 21c is an example and is not limited thereto. The main support portion c1 and the reinforcement portion c2 may be integrally formed.

  In the embodiment, in the head unit 21, the common flow path is provided on the downstream side (front side) in the recording medium conveyance direction, and the circuit board 21d is provided on the upstream side (rear side) in the recording medium conveyance direction. However, this is only an example, and the present invention is not limited to this, and the arrangement of the common flow path and the circuit board 21d can be arbitrarily changed as appropriate. For example, the arrangement of the common flow path and the circuit board 21d may be reversed, or both of the common flow path and the circuit board 21d are collectively arranged on either the downstream side or the upstream side in the recording medium conveyance direction. You may do it.

  Furthermore, in the said embodiment, although the inkjet recording device 100 provided with the line head 20 arrange | positioned so that the conveyance belt 12 might be straddled was illustrated, it is an example and it is not restricted to this, Arbitrarily arbitrarily It can be changed. For example, ink is ejected from the inkjet head 21b while moving a carriage (not shown) on which the inkjet head 21b is mounted in a predetermined direction (main scanning direction), and an image is formed on a recording medium conveyed by the conveyance device 10. An inkjet recording apparatus having a configuration may be used.

  In the above embodiment, the ink jet head 21b that ejects ink is exemplified as the liquid ejecting head. However, the ink jet head 21b is not limited to this example, and may be arbitrarily selected as long as it ejects liquid. It can be changed.

  Furthermore, it is needless to say that other specific detailed structures can be appropriately changed.

  In addition, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

100 Inkjet recording device (liquid ejection device)
10 Conveying device (conveying unit)
20 Line head 21 Head unit 21b Inkjet head b1 Inlet (communication part)
b2 Outlet (communication part)
21c Support member c2 Reinforcement portion 21d Circuit board 21e Common flow path forming member 30 Mounting base

Claims (8)

A plurality of liquid discharge heads for discharging liquid from the lower portion, and a communication portion that is in communication with the liquid flow path is formed at the upper portion;
A long support member that supports the plurality of liquid discharge heads,
A reinforcing portion is provided on the upper surface of the supporting member along the longitudinal direction of the supporting member, and the plurality of liquid discharge heads are arranged in two rows along the longitudinal direction so as to sandwich the reinforcing portion. A head unit characterized by   2. The head according to claim 1, further comprising a common flow path that is provided above the plurality of liquid discharge heads and supplies liquid to each of the liquid discharge heads via the communication portion. unit.   The head unit according to claim 2, wherein the common flow path is arranged on one of the two rows of the liquid ejection heads along the longitudinal direction.   The head unit according to claim 1, further comprising a circuit board that is provided above the liquid discharge head and that drives the liquid discharge head. A circuit board that is provided above the liquid discharge head and that drives the liquid discharge head;
The circuit board is arranged on the row side of the two rows of the liquid discharge heads along the longitudinal direction where the common flow path for supplying the liquid to each of the liquid discharge heads is not provided. The head unit according to claim 3, wherein the head unit is formed. A liquid ejection apparatus comprising a plurality of head units according to any one of claims 1 to 5,
The plurality of head units are juxtaposed substantially orthogonal to the longitudinal direction,
A liquid ejection apparatus, further comprising: a plurality of mounts provided so as to sandwich each of the plurality of head units in a direction substantially orthogonal to the longitudinal direction. A recording medium transport unit provided below the plurality of head units;
The head unit and the gantry are arranged so that the longitudinal direction is substantially orthogonal to the recording medium conveyance direction by the conveyance unit,
The liquid ejection apparatus according to claim 6, wherein the liquid ejection head ejects ink onto a recording medium conveyed by the conveyance unit. A liquid ejection apparatus comprising the head unit according to any one of claims 1 to 5,
A recording medium transport unit provided below the head unit;
The liquid ejection apparatus, wherein the liquid ejection head ejects ink onto a recording medium conveyed by the conveyance unit.

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