JP2022023528A - Liquid jet head, and liquid jet device - Google Patents

Abstract

To reduce occurrence of stagnation of liquid even when arranged and inclined with respect to a horizontal plane.SOLUTION: A liquid jet head includes a nozzle array in which a plurality of nozzles for jetting liquid in a first direction is arranged in a second direction orthogonal to a first direction, a plurality of individual flow passages, a supply side common liquid chamber, a discharge side common liquid chamber, a first bypass flow passage and second bypass flow passage which connect the supply side common liquid chamber and the discharge side common liquid chamber, and an introduction flow passage which communicates with the supply side common liquid chamber between the first bypass flow passage and the second bypass flow passage. The first bypass flow passage has a first vertical part extending in a third direction as an opposite direction to the first direction from the supply side common liquid chamber. The second bypass flow passage has a second vertical part extending in the third direction from the supply side common liquid chamber. The first vertical part is positioned in a fourth direction which is an opposite direction to the second direction from the individual flow passage arranged closest to the second direction. The second vertical part is positioned in the second direction from the individual flow passage arranged closest to the fourth direction.SELECTED DRAWING: Figure 10

Description

The present invention relates to a liquid injection head and a liquid injection device.

Conventionally, as typified by an inkjet printer, a liquid injection device having a liquid injection head for injecting a liquid such as ink is known. For example, Patent Document 1 describes a liquid injection device having a bypass flow path connecting the supply side common liquid chamber and the discharge side common liquid chamber at the longitudinal end of the supply side common liquid chamber and the discharge side common liquid chamber. Is disclosed. Patent Document 2 discloses a liquid injection device having a configuration in which four line heads are arranged around a drum that rotationally conveys paper. The nozzle surfaces of the four line heads of the liquid injection device disclosed in Patent Document 2 are arranged so as to be inclined with respect to the horizontal plane.

Japanese Unexamined Patent Publication No. 2013-144430 Japanese Unexamined Patent Publication No. 2011-79170

However, when the nozzle surface of the liquid injection device described in Patent Document 1 described above is arranged so as to be inclined with respect to the horizontal plane as in the line head described in Patent Document 2, the common liquid chamber on the supply side and the discharge side are discharged. There was a problem that liquid stagnation occurred and air bubbles stayed in the vicinity of the communication hole to the bypass flow path in the side common liquid chamber.

In order to solve the above problems, in one aspect of the liquid injection head according to the preferred embodiment of the present invention, a plurality of nozzles for injecting liquid in the first direction are arranged in a second direction orthogonal to the first direction. The configured nozzle row, a plurality of individual flow paths communicating with each of the plurality of nozzles, extending in the second direction and communicating with the plurality of individual flow paths, and liquid in the plurality of individual flow paths. A common liquid chamber on the supply side, which extends in the second direction and communicates with the plurality of individual flow paths, and a common liquid chamber on the discharge side through which the liquid discharged from the plurality of individual flow paths flows. A first bypass flow path connecting the supply-side common liquid chamber and the discharge-side common liquid chamber, and a second bypass flow path connecting the supply-side common liquid chamber and the discharge-side common liquid chamber. The first bypass flow path is provided with an introduction flow path that communicates with the supply-side common liquid chamber between the first bypass flow path and the second bypass flow path in the second direction. The second bypass flow path has a first vertical portion extending from the common liquid chamber on the supply side in a third direction opposite to the first direction, and the second bypass flow path is the third direction from the common liquid chamber on the supply side. The first vertical portion has a second vertical portion extending in the second direction, and the first vertical portion is located in a fourth direction opposite to the second direction with respect to the individual flow path arranged in the second direction. The second vertical portion is located in the second direction with respect to the individual flow path arranged in the fourth direction.

One aspect of the liquid injection device according to the preferred aspect of the present invention is the liquid injection head described above, the fifth direction orthogonal to the first direction, and the fifth direction holding the liquid injection head. A moving mechanism for reciprocating the liquid injection head in the opposite direction is provided, and the second direction is a direction intersecting with the fifth direction.

One aspect of the liquid injection device according to the preferred embodiment of the present invention includes the liquid injection head described above, and the liquid injection head constitutes a long line head in the fifth direction orthogonal to the first direction. However, the second direction is a direction that intersects with the fifth direction.

One aspect of the liquid injection device according to the preferred embodiment of the present invention includes the liquid injection head described above, the first line head elongated in the fifth direction orthogonal to the first direction, and the liquid described above. A second line head composed of an injection head and long in the fifth direction, which is arranged in a sixth direction orthogonal to the fifth direction when viewed in the direction of gravity, and a medium. The first line head includes a transport mechanism for transporting, and the end of the first nozzle surface of the first line head in the sixth direction is opposite to the sixth direction of the first nozzle surface. The second line head is arranged so as to be inclined so as to be located in a direction opposite to the gravity direction with respect to the end portion in the seventh direction, and the second line head is the second nozzle surface of the second line head. The end portions in the six directions are arranged so as to be inclined so as to be located in the gravity direction with respect to the end portion in the seventh direction of the second nozzle surface.

One aspect of the liquid injection device according to a preferred embodiment of the present invention includes the liquid injection head described above.

The explanatory view which shows an example of the liquid injection apparatus 100 which concerns on 1st Embodiment. The perspective view of the head module 3. An exploded perspective view of the liquid injection head 30 shown in FIG. 2. The plan view of the flow path structure 34 seen in the Z2 direction. The plan view of the wiring board 35 seen in the Z2 direction. The plan view of the flow path distribution part 37 seen in the Z2 direction. An exploded perspective view of the head unit 38_1. FIG. 7 is a cross-sectional view taken along the line VIII-VIII in FIG. A plan view of the head unit 38_1 in the Z2 direction. FIG. 7 is a cross-sectional view taken along the line IX-IX in FIG. An enlarged view of the vicinity of the V2 end region MN1a. Top view and side view of the wiring member 388. The figure which shows the outline of the flow path formed by the flow path structure 34 and the flow path distribution part 37. The figure which shows the flow path formed in the flow path structure 34. The perspective view of the flow path formed in the flow path distribution part 37. The plan view of the flow path formed in the flow path distribution part 37. The perspective view of the first flow path member Du1. The figure which shows the case where the nozzle surface FN is inclined in 1st Example. The figure which shows the supply side common liquid chamber MN1 when the nozzle surface FN is inclined in this embodiment. The figure which shows the supply side common liquid chamber MN1 when the nozzle surface FN is inclined in 2nd Example. The figure which shows the discharge side common liquid chamber MN2 when the nozzle surface FN is inclined in this embodiment. The explanatory view which shows an example of the liquid injection apparatus 100A which concerns on 2nd Embodiment. The schematic diagram of the liquid injection device 100B in the 3rd Embodiment. The plan view which saw the head unit 38D in the Z2 direction in the 1st modification.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. However, in each figure, the dimensions and scale of each part are appropriately different from the actual ones. Further, since the embodiments described below are suitable specific examples of the present invention, various technically preferable limitations are attached, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, it is not limited to these forms.

1. 1. First Embodiment Hereinafter, the liquid injection device 100 according to the first embodiment will be described.

1.1. Overview of the Liquid Injection Device 100 FIG. 1 is an explanatory diagram showing an example of the liquid injection device 100 according to the first embodiment. The liquid injection device 100 according to the present embodiment is an inkjet printing device that injects ink, which is an example of a liquid, as droplets onto a medium PP. The liquid injection device 100 of the present embodiment is a so-called line-type printing device in which a plurality of nozzles N for injecting ink are distributed over the entire range in the width direction of the medium PP. The medium PP is, for example, printing paper, but any printing target such as a resin film or a cloth can be used as the medium PP.

As illustrated in FIG. 1, the liquid injection device 100 includes a liquid container 93 for storing ink. As the liquid container 93, for example, a cartridge that can be attached to and detached from the liquid injection device 100, a bag-shaped ink pack made of a flexible film, an ink tank that can be refilled with ink, and the like can be adopted. A plurality of types of ink having different colors are stored in the liquid container 93.

Although not shown, the liquid container 93 of the present embodiment includes a first liquid container and a second liquid container. The first ink is stored in the first liquid container. The second liquid container stores a second ink of a type different from that of the first ink. For example, the first ink and the second ink are inks of different colors from each other. The first ink and the second ink may be the same type of ink.

As illustrated in FIG. 1, the liquid injection device 100 includes a head module 3 having a plurality of liquid injection heads 30, a control device 90, a transfer mechanism 92, and a circulation mechanism 94.
The control device 90 includes, for example, a processing circuit such as a CPU or FPGA and a storage circuit such as a semiconductor memory, and controls each element of the liquid injection device 100. Here, CPU is an abbreviation for Central Processing Unit, and FPGA is an abbreviation for Field Programmable Gate Array.

The transport mechanism 92 transports the medium PP in the Y1 direction under the control of the control device 90. In the following, the Y1 direction and the Y2 direction, which is a direction opposite to the Y1 direction, are collectively referred to as a Y-axis direction.

The head module 3 ejects the ink supplied from the liquid container 93 in the Z2 direction under the control of the control device 90. The Z2 direction is a direction orthogonal to the Y1 direction. Hereinafter, the Z2 direction and the Z1 direction, which is a direction opposite to the Z2 direction, may be collectively referred to as a Z-axis direction. The head module 3 will be described with reference to FIG.

1.2. Head module 3
FIG. 2 is a perspective view of the head module 3. The head module 3 includes a plurality of liquid injection heads 30 and a head fixing substrate 13 that holds the plurality of liquid injection heads 30. The plurality of liquid injection heads 30 are juxtaposed in the X1 direction and the X2 direction, which are directions orthogonal to the Y1 direction, which is the transport direction, and are fixed to the head fixing substrate 13. The X2 direction is opposite to the X1 direction. In the following, the X1 direction and the X2 direction may be collectively referred to as the X-axis direction. The head module 3 is a line head having a plurality of liquid injection heads 30 arranged so that a plurality of nozzles N are distributed over the entire range of the medium PP in the X-axis direction. That is, the plurality of liquid injection heads 30 form a long line head in the X-axis direction. By injecting ink from the plurality of liquid injection heads 30 in parallel with the transfer of the medium PP by the transfer mechanism 92, an image of ink is formed on the surface of the medium PP. The head module 3 is a long line in the extension direction of the X-axis composed of only a single liquid injection head 30 arranged so that a plurality of nozzles N are distributed over the entire range of the medium PP in the X-axis direction. It may be a head. The head fixing substrate 13 has a plurality of mounting holes 15 for mounting the liquid injection head 30. The liquid injection head 30 is supported by the head fixing substrate 13 in a state of being inserted into the mounting hole 15.

The explanation is returned to FIG. The XYZ coordinate system shown in FIG. 1 is a local coordinate system showing coordinates with respect to the head module 3. When the posture of the head module 3 changes, the orientation in the X-axis direction, the orientation in the Y-axis direction, and the orientation in the Z-axis direction change.

The transport mechanism 92 transports the medium PP to the head module 3 in the Y-axis direction. In the example shown in FIG. 1, the liquid container 93 is connected to the head module 3 via the circulation mechanism 94. The circulation mechanism 94 is a mechanism for supplying ink to each of the plurality of liquid injection heads 30 and collecting the ink discharged from each of the plurality of liquid injection heads 30 for resupply to the liquid injection head 30. .. The circulation mechanism 94 has, for example, a sub tank for storing ink, a flow path for supplying ink from the sub tank to the liquid injection head 30, a flow path for collecting ink from the liquid injection head 30 to the sub tank, and ink. It has a pump for flowing appropriately. By the operation of the circulation mechanism 94, it is possible to suppress an increase in the viscosity of the ink and reduce the retention of air bubbles in the ink.

As illustrated in FIG. 1, the liquid injection head 30 is supplied with a drive signal Com for driving the liquid injection head 30 and a control signal SI for controlling the liquid injection head 30 from the control device 90. Will be done. Then, the liquid injection head 30 is driven by the drive signal Com under the control of the control signal SI, and ink is ejected in the Z2 direction from a part or all of the plurality of nozzles N provided in the liquid injection head 30. .. The nozzle N will be described later in FIGS. 7 and 8.

1.3. Liquid injection head 30
FIG. 3 is an exploded perspective view of the liquid injection head 30 shown in FIG. As shown in FIG. 3, the liquid injection head 30 includes a housing 31, a cover substrate 32, an assembly substrate 33, a flow path structure 34, a wiring board 35, a flow path distribution section 37, and a fixing plate 39. And have. Further, the liquid injection head 30 has head units 38_1, 38_2, 38_3, 38_4, 38_5, and 38_6. When the head units 38_1, 38_2, 38_3, 38_4, 38_5, and the head unit 38_6 are not distinguished, they are referred to as the head unit 38. Further, the flow path structure 34 includes a flow path plate Su1, a flow path plate Su2, a flow path plate Su3, a connection pipe 341i1, a connection pipe 341i2, a connection pipe 341o1, a connection pipe 341o2, and a connector hole. It has 343 and. The flow path distribution unit 37 includes a first flow path member Du1, a second flow path member Du2, a connection pipe 373i1, a connection pipe 373i2, a connection pipe 373o_1, a connection pipe 373o_2, a connection pipe 373o_3, and a connection pipe. It has 373o_4, a connecting pipe 373o_5, and a connecting pipe 373o_6. In the following description, the connecting pipe 373i1, the connecting pipe 373i2, the connecting pipe 373o_1, the connecting pipe 373o_2, the connecting pipe 373o_3, the connecting pipe 373o_4, the connecting pipe 373o_5, and the connecting pipe 373o_6 are referred to as the connecting pipe 373. Collectively referred to. The first flow path member Du1 is an example of the "first flow path member", and the second flow path member Du2 is an example of the "second flow path member".

The housing 31 supports the flow path structure 34, the wiring board 35, the flow path distribution section 37, and the fixing plate 39. Further, the housing 31 has a supply hole 311i1, a supply hole 311i2, a discharge hole 312o1, a discharge hole 312o2, and a collecting substrate hole 313. A connection pipe 341i1 is inserted and fitted into the supply hole 311i1. A connection pipe 341i2 is inserted and fitted into the supply hole 311i2. A connection pipe 341o1 is inserted and fitted into the discharge hole 312o1. A connection pipe 341o2 is inserted and fitted into the discharge hole 312o2. The assembly board 33 is inserted into the assembly board hole 313. The housing 31 is made of metal or resin. Alternatively, the housing 31 may be made of a member whose surface is covered with a metal film.

The cover substrate 32 sandwiches the collective substrate 33 with a portion of the housing 31 extending in the Z1 direction. The assembly board 33 is a board on which wiring for transmitting the drive signal Com and the control signal SI supplied from the control device 90 to the head unit 38 is formed. The assembly substrate 33 is a plate-shaped member extending parallel to the XZ plane. Here, "parallel" means parallel in design, in addition to the case where it is completely parallel, but it is parallel in consideration of an error caused by, for example, a manufacturing error of the liquid injection head 30. It is a concept that includes the case where it can be regarded as.

The flow path structure 34 is a structure in which a flow path for flowing ink between the circulation mechanism 94 and each of the plurality of head units 38 is provided inside. The flow path structure 34 is arranged between the housing 31 and the wiring board 35. The flow path plate Su1, the flow path plate Su2, and the flow path plate Su3 included in the flow path structure 34 are laminated in this order in the Z1 direction. The flow path plate Su1, the flow path plate Su2, and the flow path plate Su3 are joined to each other by an adhesive or the like. The flow path plate Su1, the flow path plate Su2, and the flow path plate Su3 are formed, for example, by injection molding of a resin.

FIG. 4 is a plan view of the flow path structure 34 as viewed in the Z2 direction. As illustrated in FIG. 4, the outer shape of the flow path structure 34 is an octagon with rounded corners in a plan view in the Z2 direction. Hereinafter, the plan view seen in the Z2 direction is simply referred to as "plan view". As a specific shape of the flow path structure 34, the flow path structure 34 has a side He1, a side He2, a side He3, a side He4, a side He5, a side He6, a side He7, and a side He8. Has. In a plan view, the outer shape of the flow path structure 34 is substantially point-symmetrical with respect to the center of gravity G34 of the flow path structure 34. The center of gravity referred to here is a point at which the total sum of the primary moments becomes zero in the target shape when viewed in a plane, and is an intersection of diagonal lines in the case of a rectangular shape.

The side He1 is a side parallel to the X-axis, is adjacent to the side He8 and the side He2, and is located most in the Y2 direction. The side He2 is a side parallel to the Y-axis direction, adjacent to the side He1 and the side He3, and is located most in the X2 direction. The side He3 is adjacent to the side He2 and the side He4, and is a side parallel to the V-axis direction. The V-axis direction is a general term for the V1 direction and the V2 direction. The V1 direction intersects the X1 direction and the Y1 direction. More specifically, the V1 direction is a direction rotated clockwise by approximately 56 degrees in the X1 direction. The V2 direction is the opposite direction to the V1 direction. The side He4 is adjacent to the side He3 and the side He5, and is a side parallel to the Y-axis direction. The side He5 is adjacent to the side He4 and the side He6, is a side parallel to the X-axis direction, and is located most in the Y1 direction. The side He6 is adjacent to the side He5 and the side He7, is a side parallel to the Y-axis direction, and is located most in the X1 direction. The side He7 is adjacent to the side He6 and the side He8, and is a side parallel to the V-axis direction. The side He8 is adjacent to the side He7 and the side He1 and is a side parallel to the Y-axis direction.

The explanation is returned to FIG. The wiring board 35 is a mounting component for electrically connecting the liquid injection head 30 to the control device 90. The wiring board 35 is a board on which wiring for transmitting various control signals and power supply voltages to the head unit 38 is formed. The wiring board 35 is a plate-shaped member extending parallel to the XY plane, and is arranged between the flow path structure 34 and the flow path distribution portion 37. The wiring board 35 is a rigid board. The wiring board 35 will be described in detail with reference to FIG.

1.3.1. Wiring board 35
FIG. 5 is a plan view of the wiring board 35 as viewed in the Z2 direction. The wiring board 35 includes notches 352_1, openings 351_2, 351_3, 351_4, and 351_5, notches 352_6, a plurality of terminals 353_1, a plurality of terminals 353_2, a plurality of terminals 353_3, a plurality of terminals 353_4, and a plurality of terminals 353_1. It has a plurality of terminals 353_5, a plurality of terminals 353_6, a connector 355, openings 357_1, 357_3, 357_4, and 357_6, and notches 358_2 and 358_5.

When the openings 351_2, 351_3, 351_4, and 351_5 are not distinguished, they are referred to as openings 351. Similarly, when the notch portion 352_1 and 352_1 are not distinguished, it is referred to as the notch portion 352. Similarly, when a plurality of terminals 353_1, a plurality of terminals 353_2, a plurality of terminals 353_3, a plurality of terminals 353_4, a plurality of terminals 353_5, and a plurality of terminals 353_6 are not distinguished, they are referred to as terminals 353. Similarly, when the openings 357_1, 357_3, 357_4, and 357_6 are not distinguished, they are referred to as openings 357. Similarly, when the notch portions 358_2 and 358_5 are not distinguished, they are referred to as the notch portion 358. The wiring board 35 may have an opening 351 different from the openings 351_2, 351_3, 351_4, and 351_5 instead of having one or both of the notches 352_1 and 352_6. Similarly, the wiring board 35 may have an opening 357 separate from the openings 357_1, 357_3, 357_4, 357_6, instead of having one or both of the notches 358_2 and 358_5.

Each of the four openings 351 extends in the V1 direction. Further, one side of the notch portion 352_1 formed and one side of the notch portion 352_1 formed extend in the V1 direction. Further, the plurality of terminals 353_1 are arranged in the V1 direction, the plurality of terminals 353_2 are arranged in the V1 direction, the plurality of terminals 353_3 are arranged in the V1 direction, the plurality of terminals 353_4 are arranged in the V1 direction, and the plurality of terminals 353_1 are arranged. Are arranged in the V1 direction, and the plurality of terminals 353_6 are arranged in the V1 direction. Of the two directions orthogonal to the Z1 direction and the V1 direction, the direction closer to the X1 direction is referred to as the W1 direction. Further, of the two directions orthogonal to the Z1 direction and the V1 direction, the direction closer to the X2 direction is referred to as the W2 direction. In other words, the W1 direction is the direction containing the components in the X1 direction and the Y2 direction among the two directions orthogonal to the Z1 direction and the V1 direction, and the W2 direction is the two directions orthogonal to the Z1 direction and the V1 direction. Of these, the direction includes the components in the X2 direction and the Y1 direction. Further, the W1 direction and the W2 direction are collectively referred to as the W axis direction.

The wiring member 388 of the head unit 38_i, which will be described later, is inserted into the opening 351_i. i is an integer from 2 to 5. One side of the cutout portion 352_j extending in the V1 direction is fitted with the wiring member 388 of the head unit 38_j. j is 1 and 6. The plurality of input terminals 3886 provided in the input terminal portion 3882 of the wiring member 388 of the head unit 38_k come into contact with the plurality of terminals 353_k. k is an integer from 1 to 6. The input terminal unit 3882 and the plurality of input terminals 3886 will be described later with reference to FIG.

As illustrated in FIG. 5, the arrangement of the four openings 351 and the two notches 352 is staggered. More specific arrangements of the six openings 351 are as follows. One side of the cutout portion 352_1 extending in the V1 direction, one side extending in the V1 direction among the opening portion 351_2, the opening portion 351_3, the opening portion 351_4, the opening portion 351_5, and the notch portion 352_1 is in the W axis direction. They are arranged in this order.

A connecting pipe 373o_i is inserted through the opening 357_i. i is 1, 3, 4, and 6. A connecting pipe 373o_j is fitted to the cutout portion 358_j. j is 2 and 5. The notch portion 358_1 is located in the V1 direction with respect to the notch portion 352_1. The opening 357_k is located in the V1 direction with respect to the opening 351_k-1. k is 4 and 6. The opening 357_m is located in the V2 direction with respect to the opening 351_m + 1. m is 1 and 3. The notch portion 358_5 is located in the V2 direction with respect to the notch portion 352_6.

1.3.2. Channel distribution unit 37
The explanation is returned to FIG. The flow path distribution unit 37 is arranged between the wiring board 35 and the fixing plate 39, and is fixed to the fixing plate 39 with an adhesive. Therefore, the flow path distribution unit 37 reinforces the fixing plate 39. The flow path distribution unit 37 is made of, for example, resin or metal. From the viewpoint of the above-mentioned reinforcement, the thickness of the flow path distribution portion 37 is preferably thicker than that of the fixing plate 39.

FIG. 6 is a plan view of the flow path distribution unit 37 as seen in the Z2 direction. The first flow path member Du1 and the second flow path member Du2 included in the flow path distribution unit 37 are laminated in this order in the Z1 direction. Eight connecting pipes 373 are provided on the surface of the flow path distribution unit 37 on the Z1 direction side. The eight connecting pipes 373 are flow path pipes that project in the Z1 direction from the surface of the second flow path member Du2 on the Z1 direction side.

The flow path distribution unit 37 has a plurality of openings 371_1, 371_2, 371_3, 371_4, 371_5, 371_6 penetrating in the Z-axis direction. When a plurality of openings 371_1 to 371_6 are not distinguished, it is referred to as an opening 371. The wiring member 388 of each of the plurality of head units 38 is inserted into the six openings 371. The arrangement of each of the six openings 371 is also staggered like the openings 351 of the wiring board 35.

The opening 371 is an opening that is longer in the V-axis direction than the opening 351 of the wiring board 35. Specifically, the opening 371_1 communicates with the notch 352_1 of the wiring board 35 and extends in the V2 direction rather than one side extending in the V1 direction of the notch 352_1 in a plan view seen in the Z2 direction. ing. The opening 371_2 communicates with the opening 351-2 of the wiring board 35 and extends in the V1 direction from the opening 351-2 in a plan view. The opening 371_3 communicates with the opening 351_3 of the wiring board 35 and extends in the V2 direction from the opening 351_3 in a plan view. The opening 371_4 communicates with the opening 351_4 of the wiring board 35 and extends in the V1 direction from the opening 351_4 in a plan view. The opening 371_5 communicates with the opening 351_5 of the wiring board 35 and extends in the V2 direction from the opening 351_5 in a plan view. The opening 371_6 communicates with the notch 352_6 of the wiring board 35 and extends in the V1 direction from the V1 direction of the notch 352_6 in a plan view.

The connecting pipe 373i1 is arranged at the corners of the flow path distribution unit 37 in the X1 direction and the Y2 direction. The connecting pipe 373i2 is arranged at the corners of the flow path distribution unit 37 in the X2 direction and the Y1 direction. The connecting tube 373o_n is arranged in the V1 direction with respect to the opening 371_n-1. n is 2, 4, and 6. The connection tube 373o_p is arranged in the V2 direction with respect to the opening 371_p + 1. p is 1, 3, and 5.

The connecting pipe 373i1 communicates with the discharge port CE1 formed on the surface of the flow path structure 34 in the Z2 direction, and introduces ink from the flow path structure 34 into the flow path distribution unit 37. Similarly, the connecting pipe 373i2 communicates with the discharge port CE2 formed on the surface of the flow path structure 34 in the Z2 direction, and ink is introduced from the flow path structure 34 into the flow path distribution unit 37. The flow path distribution unit 37 has a flow path for distributing the ink supplied from the flow path structure 34 to each head unit 38. Further, the flow path distribution unit 37 has a flow path through which the ink discharged from each head unit 38 flows. The connecting pipes 373o_1 to 373o_6 communicate with any one of the introduction ports CI1_1, CI1_3, CI1_5, CI2_2, CI2_4, and CI2_6 formed on the surface of the flow path structure 34 in the Z2 direction, and the flow path distribution unit 37. Is introduced into the flow path structure 34 from the ink. The discharge ports CE1, CE2, introduction ports CI1-1, CI1_3, CI1_5, CI2_2, CI2_4, and CI2_6 will be described later with reference to FIGS. 13 and 14.

The explanation is returned to FIG. The head unit 38 has M nozzles N. M is an integer of 2 or more. The arrangement of each of the six head units 38 is also staggered, similar to the opening 351 of the wiring board 35. The head unit 38_1 will be described with reference to FIGS. 7, 8, 9, 10, and 11.

1.3.3. Head unit 38
FIG. 7 is an exploded perspective view of the head unit 38_1. FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. The VIII-VIII line is a virtual line segment that passes through the inlet 3851 and the outlet 3852 and passes through the nozzle N. In the figure shown in FIG. 8, in addition to the cross section of the head unit 38_1, the cross section of the fixing plate 39 is also shown.

As illustrated in FIGS. 7 and 8, the head unit 38_1 includes a nozzle plate 387, a compliance board 3861, a communication board 382, a pressure chamber board 383, a diaphragm 384, a case 385, and a wiring member 388. , Equipped with.

As illustrated in FIG. 7, the nozzle plate 387 is a plate-shaped member that is long in the V-axis direction and extends parallel to the VW plane, and M nozzles N are formed. The nozzle plate 387 is manufactured by processing a single crystal substrate of silicon using, for example, a semiconductor manufacturing technique such as etching. However, known materials and manufacturing methods can be arbitrarily adopted for manufacturing the nozzle plate 387. Further, the nozzle N is a through hole provided in the nozzle plate 387. In the present embodiment, as an example, it is assumed that M nozzles N are provided in the nozzle plate 387 so as to form a nozzle row Ln extending in the V-axis direction. However, the nozzle plate 387 may have a plurality of nozzle rows Ln in which a part of M nozzles N is arranged in the V-axis direction.

As illustrated in FIGS. 7 and 8, a communication plate 382 is provided in the Z1 direction of the nozzle plate 387. The communication plate 382 is a plate-shaped member that is long in the V-axis direction and extends substantially parallel to the VW plane, and forms an ink flow path.
Specifically, one supply liquid chamber RA1 and one discharge liquid chamber RA2 are formed in the communication plate 382. Of these, the supply liquid chamber RA1 is provided so as to communicate with the supply liquid chamber RB1 described later and extend in the V-axis direction. Further, the discharge liquid chamber RA2 is provided so as to communicate with the discharge liquid chamber RB2 described later and extend in the V-axis direction. The supply liquid chamber RA1 may be divided into a plurality of parts in the V-axis direction, and the discharge liquid chamber RA2 may be similarly divided into a plurality of parts in the V-axis direction. Hereinafter, the common liquid chamber formed by the supply liquid chamber RA1 and the supply liquid chamber RB1 will be referred to as “supply side common liquid chamber MN1”. Similarly, the common liquid chamber formed by the discharge liquid chamber RA2 and the discharge liquid chamber RB2 is referred to as a “drainage side common liquid chamber MN2”.

Further, in the communication plate 382, M nozzle flow paths RN corresponding to one-to-one with M nozzles N, and M communication flow paths RR1 corresponding to one-to-one with M nozzles N are provided. M communication flow paths RR2 corresponding to M nozzles N and 1 to 1, M communication flow paths RK1 corresponding to 1 to 1 with M nozzles N, and 1 pair to M nozzles N. M communication flow paths RK2 corresponding to 1, M communication flow paths RX1 corresponding to 1 to 1 with M nozzles N, and M communication channels corresponding to 1 to 1 with M nozzles N. The flow path RX2 and the flow path RX2 are formed. The communication plate 382 may be formed with one communication flow path RX1 and communication flow path RX2 commonly provided in the M nozzles N. In this case, the communication flow path RX1 constitutes a part of the "supply side common liquid chamber MN1", and the communication flow path RX2 constitutes a part of the "discharge side common liquid chamber MN2". Further, a plurality of communication flow paths RX1 commonly provided for some nozzles N among the M nozzles N may be formed, or for some nozzles N among the M nozzles N. A plurality of communication flow paths RX2 provided in common may be formed.

As illustrated in FIG. 8, in the present embodiment, the communication flow path RX1 communicates with the supply liquid chamber RA1 and is provided so as to extend in the W2 direction and the W axis direction when viewed from the supply liquid chamber RA1. Further, the communication flow path RK1 is provided so as to communicate with the communication flow path RX1 and extend in the Z-axis direction in the W2 direction when viewed from the communication flow path RX1. Further, the communication flow path RR1 is provided so as to extend in the Z-axis direction in the W2 direction when viewed from the communication flow path RK1.
Further, the communication flow path RX2 communicates with the discharge liquid chamber RA2 and is provided so as to extend in the W1 direction in the W1 direction when viewed from the discharge liquid chamber RA2. Further, the communication flow path RK2 communicates with the communication flow path RX2 and is provided so as to extend in the Z-axis direction in the W1 direction when viewed from the communication flow path RX2. Further, the communication flow path RR2 is provided so as to extend in the W1 direction when viewed from the communication flow path RK2 and in the W2 direction when viewed from the communication flow path RR1 so as to extend in the Z-axis direction.
Further, the nozzle flow path RN communicates the communication flow path RR1 and the communication flow path RR2, and extends in the W2 direction when viewed from the communication flow path RR1 and in the W1 direction when viewed from the communication flow path RR2. It is provided to exist. The nozzle flow path RN communicates with the nozzle N corresponding to the nozzle flow path RN.
The communication plate 382 is manufactured, for example, by processing a silicon single crystal substrate using semiconductor manufacturing technology. However, a known material or manufacturing method may be arbitrarily adopted for manufacturing the communication plate 382.

As illustrated in FIGS. 7 and 8, a pressure chamber substrate 383 is provided in the Z1 direction of the communication plate 382. The pressure chamber substrate 383 is a plate-shaped member that is long in the V-axis direction and extends substantially parallel to the VW plane, and forms an ink flow path.
Specifically, the pressure chamber substrate 383 has M pressure chambers CB1 corresponding to one-to-one with M nozzles N and M pressure chambers CB2 corresponding to one-to-one with M nozzles N. And are formed. Hereinafter, the pressure chamber CB1 and the pressure chamber CB2 are collectively referred to as a pressure chamber CB. The pressure chamber CB1 communicates the communication flow path RK1 and the communication flow path RR1, and when viewed in the Z-axis direction, the end portion of the communication flow path RK1 in the W1 direction and the end portion of the communication flow path RR1 in the W2 direction. It is provided so as to connect and extend in the W-axis direction. Further, the pressure chamber CB2 communicates the communication flow path RK2 and the communication flow path RR2, and when viewed in the Z-axis direction, the end of the communication flow path RK2 in the W2 direction and the end of the communication flow path RR2 in the W1 direction. It is provided so as to connect the portions and extend in the W-axis direction. The number of pressure chambers CB provided corresponding to one nozzle N may be one, in other words, one of the pressure chamber CB1 and the pressure chamber CB2 is provided for one nozzle N. It does not matter if it is configured.
The pressure chamber substrate 383 is manufactured, for example, by processing a silicon single crystal substrate using semiconductor manufacturing technology. However, known materials and manufacturing methods can be arbitrarily adopted for manufacturing the pressure chamber substrate 383.

In the following, the ink flow path communicating with the supply side common liquid chamber MN1, the nozzle N, and the discharge side common liquid chamber MN2 will be referred to as an “individual flow path RJ”, and the supply side common liquid chamber MN1 and the discharge side will be referred to. The ink flow path that connects the common liquid chamber MN2 and does not communicate with the nozzle N is referred to as "bypass flow path BP".

FIG. 9 is a plan view of the head unit 38_1 as viewed in the Z2 direction. In the figure shown in FIG. 9, the wiring member 388 is shown by a alternate long and short dash line in order to show the positional relationship between the bypass flow path BP and the wiring member 388. FIG. 10 is a cross-sectional view taken along the line IX-IX in FIG. The IX-IX line is a virtual line segment passing through a bypass port 3853a provided in the W1 direction and the V2 direction, an introduction port 3851, and a bypass port 3853c provided in the W1 direction and the V1 direction. In the figure shown in FIG. 10, in addition to the cross section of the head unit 38_1, the cross section of the flow path distribution unit 37 and the fixing plate 39 is also shown.

As illustrated in FIG. 9, the supply-side common liquid chamber MN1 and the discharge-side common liquid chamber MN2 are communicated with M nozzles N by M individual flow paths RJ corresponding to 1: 1. As described above, each individual flow path RJ includes a communication flow path RX1 communicating with the common liquid chamber MN1 on the supply side, a communication flow path RK1 communicating with the communication flow path RX1, and a pressure chamber CB1 communicating with the communication flow path RK1. , The communication flow path RR1 communicating with the pressure chamber CB1, the nozzle flow path RN communicating with the communication flow path RR1, the communication flow path RR2 communicating with the nozzle flow path RN, and the pressure chamber CB2 communicating with the communication flow path RR2. , The communication flow path RK2 communicating with the pressure chamber CB2, and the communication flow path RX2 communicating with the communication flow path RK2 and the discharge side common liquid chamber MN2.

As illustrated in FIGS. 9 and 10, the supply-side common liquid chamber MN1 and the discharge-side common liquid chamber MN2 are connected by a first bypass flow path BP1 and a second bypass flow path BP2. The first bypass flow path BP1 and the second bypass flow path BP2 are collectively referred to as a bypass flow path BP. Further, the first bypass flow path BP1 corresponding to the head unit 38_k may be referred to as a first bypass flow path BP1_k. Similarly, the second bypass flow path BP2 corresponding to the head unit 38_k may be referred to as a second bypass flow path BP2_k. k is an integer from 1 to 6.

As illustrated in FIG. 9, the first bypass flow path BP1 has a supply side vertical portion BP1VS, a bypass horizontal portion BP1H, and a discharge side vertical portion BP1VD. The supply-side vertical portion BP1VS extends in the Z-axis direction, communicates with the supply-side common liquid chamber MN1 at the end in the Z2 direction, and communicates with the bypass horizontal portion BP1H at the end in the Z1 direction. The supply-side vertical portion BP1VS is an example of the “first vertical portion”. The bypass horizontal portion BP1H is an example of the "first portion".

As illustrated in FIG. 10, the supply-side vertical portion BP1VS is defined by a first flow path member Du1 and a case 385. The supply-side vertical portion BP1VS has a vertical portion BP1VSa, a vertical portion BP1VSb, and a vertical portion BP1VSc. The vertical portion BP1VSa and the vertical portion BP1VSb are defined by the first flow path member Du1. The vertical portion BP1VSc is defined by the case 385. As illustrated in FIG. 10, the cross-sectional area of the vertical portion BP1VSa is smaller than the cross-sectional area of the vertical portion BP1VSb. The cross-sectional area of the vertical portion BP1VSb and the cross-sectional area of the vertical portion BP1VSc are substantially the same. The cross-sectional area of the flow path is the area of the cut surface cut by a plane intersecting in the extending direction of the flow path, typically a plane orthogonal to each other. As the cross-sectional area of the flow path decreases, the flow path resistance increases. Therefore, the flow path resistance of the average unit length of the vertical portion BP1VSa and the vertical portion BP1VSb is larger than the flow path resistance of the average unit length of the vertical portion BP1VSc. Further, the average flow path resistance of the unit lengths of the supply-side vertical portion BP1VS and BP2VS is larger than the average flow path resistance of the unit length of the bypass horizontal portion BP1H.

The bypass horizontal portion BP1H is located substantially parallel to the VW plane. The bypass horizontal portion BP1H has a straight portion BP1Ha, a bent portion BP1Hb, a straight portion BP1Hc, a bent portion BP1Hd, and a straight portion BP1He. The bent portion BP1Hb and the bent portion BP1Hd are bent so as to bypass the wiring member 388. The straight portion BP1Ha extends in the V-axis direction, communicates with the supply-side vertical portion BP1VS at the end in the V1 direction, and communicates with the bent portion BP1Hb at the end in the V2 direction. The bent portion BP1Hb is bent 90 degrees so as to be convex in the Wa2 direction, and the end portion in the V1 direction communicates with the straight portion BP1Ha, and the end portion in the W2 direction communicates with the straight portion BP1Hc. The Wa2 direction is a direction rotated 45 degrees counterclockwise in the W1 direction. The Wa2 direction and the Wa1 direction opposite to the Wa2 direction are collectively referred to as a Wa axis direction. The straight portion BP1Hc extends in the W-axis direction, communicates with the bent portion BP1Hb at the end in the W1 direction, and communicates with the bent portion BP1Hd at the end in the W2 direction. The bent portion BP1Hd is bent 90 degrees so as to be convex in the Va2 direction, and the end portion in the W1 direction communicates with the straight portion BP1Hc, and the end portion in the V1 direction communicates with the straight portion BP1He. The Va2 direction is a direction rotated 45 degrees counterclockwise in the V2 direction. The Va2 direction and the Va1 direction opposite to the Va2 direction are collectively referred to as a Va axis direction. The straight portion BP1He extends in the V-axis direction, communicates with the bent portion BP1Hd at the end in the V2 direction, and communicates with the discharge side vertical portion BP1VD at the end in the V1 direction.

The discharge-side vertical portion BP1VD extends in the Z-axis direction, communicates with the discharge-side common liquid chamber MN2 at the end in the Z2 direction, and communicates with the straight portion BP1He at the end in the Z1 direction. Although not illustrated in the figure, the discharge side vertical portion BP1VD is defined by the first flow path member Du1 and the case 385, similarly to the supply side vertical portion BP1VS. The discharge side vertical portion BP1VD has a portion defined by the first flow path member Du1 and a portion defined by the case 385. In the portion of the discharge-side vertical portion BP1VD defined by the first flow path member Du1, there is a portion where the cross-sectional area changes as in the supply-side vertical portion BP1VS. The cross-sectional area of the discharge-side vertical portion BP1VD at the end in the Z1 direction is smaller than the cross-sectional area at the end in the Z2 direction.

As illustrated in FIG. 9, the second bypass flow path BP2 has a supply side vertical portion BP2VS, a bypass horizontal portion BP2H, and a discharge side vertical portion BP2VD. The supply-side vertical portion BP2VS extends in the Z-axis direction, communicates with the supply-side common liquid chamber MN1 at the end in the Z2 direction, and communicates with the bypass horizontal portion BP2H at the end in the Z1 direction.

The supply-side vertical portion BP2VS is an example of the “second vertical portion”. The bypass horizontal portion BP2H is an example of the "first portion". Further, the bypass horizontal portion BP1H and the bypass horizontal portion BP2H are collectively referred to as a bypass horizontal portion BPH. Further, the bypass horizontal portion BP1H and the bypass horizontal portion BP2H corresponding to the head unit 38_k may be referred to as a bypass horizontal portion BP1H_k and a bypass horizontal portion BP2H_k, respectively. k is an integer from 1 to 6.

As illustrated in FIG. 10, the supply-side vertical portion BP2VS is defined by a first flow path member Du1 and a case 385. The supply-side vertical portion BP2VS has a vertical portion BP2VSa, a vertical portion BP2VSb, and a vertical portion BP2VSc. The vertical portion BP2VSa and the vertical portion BP2VSb are defined by the first flow path member Du1. The vertical portion BP2VSc is defined by the case 385. As illustrated in FIG. 10, the cross-sectional area of the vertical portion BP2VSa is smaller than the cross-sectional area of the vertical portion BP2VSb. The cross-sectional area of the vertical portion BP2VSb and the cross-sectional area of the vertical portion BP2VSc are substantially the same.

The bypass horizontal portion BP2H is located substantially parallel to the VW plane. The bypass horizontal portion BP2H has a straight portion BP2Ha, a bent portion BP2Hb, a straight portion BP2Hc, a bent portion BP2Hd, and a straight portion BP2He. The straight portion BP2Ha extends in the V-axis direction, communicates with the supply-side vertical portion BP2VS at the end in the V2 direction, and communicates with the bent portion BP2Hb at the end in the V1 direction. The bent portion BP2Hb is bent 90 degrees so as to be convex toward the Va1, the end portion in the V2 direction communicates with the straight portion BP2Ha, and the end portion in the W2 direction communicates with the straight portion BP2Hc. The straight portion BP2Hc extends in the W-axis direction, communicates with the bent portion BP2Hb at the end in the W1 direction, and communicates with the bent portion BP2Hd at the end in the W2 direction. The bent portion BP2Hd is bent 90 degrees so as to be convex toward the Wa1 direction, and the end portion in the W1 direction communicates with the straight portion BP2Hc, and the end portion in the V2 direction communicates with the straight portion BP2He. The straight portion BP2He extends in the V-axis direction, communicates with the bent portion BP2Hd at the end in the V1 direction, and communicates with the discharge side vertical portion BP2VD at the end in the V2 direction.

Further, as illustrated in FIG. 10, the bypass horizontal portion BP2H has a portion BP2H1 that does not overlap the case 385 in plan view. On the other hand, the entire bypass horizontal portion BP1H overlaps with the case 385 in a plan view.

Further, as illustrated in FIG. 10, the total length Ld of the vertical portion BP1VSa and the vertical portion BP1VSb in the Z1 direction is longer than the length Lc of the vertical portion BP1VSc in the Z1 direction. Similarly, the total length Ld of the vertical portion BP2VSa and the vertical portion BP2VSb in the Z1 direction is longer than the length Lc of the vertical portion BP2VSc in the Z1 direction.

Although not shown, the length of the portion defined by the first flow path member Du1 of the discharge side vertical portion BP1VD is the case of the discharge side vertical portion BP1VD as in the case of the supply side vertical portion BP1VS and the supply side vertical portion BP2VS. The length of the portion defined by 385 is longer than the length in the Z1 direction, and the length of the portion defined by the first flow path member Du1 of the discharge side vertical portion BP2VD is the portion defined by the case 385 of the discharge side vertical portion BP2VD. Is longer than the length in the Z1 direction.

As illustrated in FIGS. 9 and 10, the supply-side common liquid chamber MN1 communicates with the introduction flow path SPV. The introduction flow path SPV communicates with the supply side common liquid chamber MN1 between the first bypass flow path BP1 and the second bypass flow path BP2 in the V-axis direction. Similarly, the discharge-side common liquid chamber MN2 communicates with the lead-out flow path DSV. The lead-out flow path DSV communicates with the discharge-side common liquid chamber MN2 between the first bypass flow path BP1 and the second bypass flow path BP2 in the V-axis direction. The introduction flow path SPV is located at the midpoint between the end portion of the supply-side common liquid chamber MN1 in the V1 direction and the end portion in the V2 direction in a plan view. Similarly, the lead-out flow path DSV is located at the midpoint between the end portion of the discharge-side common liquid chamber MN2 in the V1 direction and the end portion in the V2 direction in a plan view. That is, in the V-axis direction, the distance from the end of the supply-side common liquid chamber MN1 in the V1 direction to the introduction flow path SPV and the distance from the introduction flow path SPV to the end of the supply-side common liquid chamber MN1 in the V2 direction. Are the same, and both are at a distance D1. Similarly, in the V-axis direction, the distance from the end of the discharge side common liquid chamber MN2 in the V1 direction to the outlet flow path DSV and the distance from the outlet flow path DSV to the end of the discharge side common liquid chamber MN2 in the V2 direction. Are the same, and both are the distance D1.

Hereinafter, the introduction flow path SPV corresponding to the head unit 38_k may be referred to as an introduction flow path SPV_k. Similarly, the lead-out flow path DSV corresponding to the head unit 38_k may be referred to as a lead-out flow path DSV_k.

As illustrated in FIG. 10, from the end of the supply-side common liquid chamber MN1 in the V2 direction to the side surface of the supply-side vertical portion BP1VS in the V2 direction, the supply is supplied according to the position on the V-axis approaching the V2 direction. The length in the Z-axis direction in the side common liquid chamber MN1 monotonically decreases. Further, from the end of the supply-side common liquid chamber MN1 in the V1 direction to the side surface of the supply-side vertical portion BP2VS in the V1 direction, the length in the Z-axis direction increases as the position on the V-axis approaches the V1 direction. It decreases monotonically. Although not shown, it is common to the discharge side as the position on the V axis approaches the V2 direction from the end of the discharge side common liquid chamber MN2 in the V2 direction to the side surface of the discharge side vertical portion BP1VD in the V2 direction. The length in the Z-axis direction in the liquid chamber MN2 decreases monotonically. Further, from the end of the common liquid chamber MN2 on the discharge side in the V1 direction to the side surface of the vertical portion BP2VD on the discharge side in the V1 direction, the length in the Z-axis direction becomes monotonous as the position on the V axis approaches the V1 direction. Decreases to.

As illustrated in FIG. 10, the supply-side common liquid chamber MN1 has a V2 end region MN1a, a V2 communication region MN1b, a distribution region MN1c, a V1 communication region MN1d, and a V1 end region MN1e. The V2 end region MN1a is an example of the “second region”. The V2 communication region MN1b is an example of the “first region”.

The V2 end region MN1a is a region of the supply-side common liquid chamber MN1 located in the V2 direction with respect to the supply-side vertical portion BP1VS. More specifically, being located in the V2 direction with respect to the supply-side vertical portion BP1VS means being located in the V2 direction with respect to the WZ plane in contact with the wall surface of the supply-side vertical portion BP1VS in the V2 direction. That is, the V2 end region MN1a is a region located in the V2 direction among the two regions in which the supply-side common liquid chamber MN1 is divided by the WZ plane in contact with the wall surface of the supply-side vertical portion BP1VS in the V2 direction.

The V2 communication region MN1b is a region of the supply-side common liquid chamber MN1 located from the introduction flow path SPV to the supply-side vertical portion BP1VS. To be located from the introduction flow path SPV to the supply side vertical portion BP1VS, more specifically, to be located in the V2 direction from the WZ plane which is in contact with the wall surface of the introduction flow path SPV in the V2 direction, and to be located in the supply side vertical portion BP1VS. It means that it is located in the V1 direction rather than the WZ plane that touches the wall surface in the V2 direction. That is, the V2 communication region MN1b is a region located in the V2 direction of the two regions divided by the WZ plane in which the supply side common liquid chamber MN1 is in contact with the wall surface of the introduction flow path SPV in the V2 direction, and the supply side common liquid chamber MN1. Is a region where the region located in the V1 direction and the region of the two regions divided by the WZ plane in contact with the wall surface of the vertical portion BP1VS on the supply side in the V2 direction overlap.

The distribution region MN1c is located in the V1 direction of the supply-side common liquid chamber MN1 from the WZ plane that is in contact with the wall surface of the introduction flow path SPV in the V2 direction, and is in contact with the wall surface of the introduction flow path SPV in the V1 direction. This is a region located in the V2 direction.

The V1 communication region MN1d is a region of the supply-side common liquid chamber MN1 located from the introduction flow path SPV to the supply-side vertical portion BP2VS. To be located from the introduction flow path SPV to the supply side vertical portion BP2VS, more specifically, it is located in the V1 direction from the WZ plane which is in contact with the wall surface of the introduction flow path SPV in the V1 direction, and is located on the wall surface of the supply side vertical portion BP2VS. It means that it is located in the V2 direction with respect to the WZ plane tangent in the V1 direction. That is, the V1 communication region MN1d is a region located in the V1 direction of the two regions divided by the WZ plane in which the supply side common liquid chamber MN1 is in contact with the wall surface of the introduction flow path SPV in the V1 direction, and the supply side common liquid chamber MN1. Is a region where the region located in the V2 direction and the region of the two regions divided by the WZ plane in contact with the wall surface of the vertical portion BP2VS on the supply side in the V1 direction overlap.

The V1 end region MN1e is a region of the supply-side common liquid chamber MN1 located in the V1 direction with respect to the supply-side vertical portion BP2VS. More specifically, being located in the V1 direction with respect to the supply-side vertical portion BP2VS means being located in the V1 direction with respect to the WZ plane in contact with the wall surface of the supply-side vertical portion BP2VS in the V1 direction. That is, the V1 end region MN1e is a region located in the V1 direction among the two regions in which the supply-side common liquid chamber MN1 is divided by the WZ plane in contact with the wall surface of the supply-side vertical portion BP1VS in the V1 direction. The V2 end region MN1a will be described with reference to FIG.

FIG. 11 is an enlarged view of the vicinity of the V2 end region MN1a. The figure shown in FIG. 11 shows the vicinity of the V2 end region MN1a in a state where the nozzle surface FN is tilted by 60 degrees with respect to the horizontal plane SF. When the head module 3 is tilted and used, the tilt angle of the nozzle surface FN is larger than 0 degrees and 90 degrees or less. As illustrated in FIG. 11, the surface MN1aS of the V2 end region MN1a is arranged in the Z2 direction with respect to the surface MN1bS of the V2 communication region MN1b. Here, the surface MN1aS is a surface of the V2 end region MN1a in the Z1 direction. The Z1 direction surface is the decomposed V-axis when the normal direction of the surface is the Z1 direction and when the normal direction of the surface is decomposed into the Z-axis direction, the V-axis direction, and the W-axis direction. This includes the case where the direction is the V1 direction. In FIG. 11, the nozzle plate 387 is shown by a broken line, and the fixing plate 39 and the support plate 3861b of the compliance substrate 3861 are not shown.

As illustrated in FIG. 11, the position of the end portion of the supply-side vertical portion BP1VS in the Z2 direction coincides with the position of the surface of the V2 communication region MN1b in the Z1 direction.

As illustrated in FIG. 11, the surface of the V2 end region MN1a in the Z1 direction is composed of a surface of the case 385 and a surface of the communication plate 382. The surface in the Z1 direction of the case 385 in the V2 end region MN1a is a tapered surface. The surface in the Z1 direction of the communication plate 382 in the V2 end region MN1a is parallel to the VW plane. The V2 direction end of the Z1 direction surface of the case 385 in the V2 end region MN1a is located in the Z1 direction from the V1 direction end of the Z1 direction surface of the communication plate 382 in the V2 end region MN1a. The V2 end region MN1a has a portion having a dimension in the Z-axis direction that is less than half of the maximum dimension in the Z-axis direction of the V2 communication region MN1b. In the example of FIG. 11, in the V-axis direction, the V2 end region MN1a located between the position in the V2 direction on the wall surface of the supply-side vertical portion BP1VS and the position of the end portion of the V2 end region MN1a in the V2 direction. The dimension MN1aC in the Z-axis direction is less than half of the maximum dimension of the V2 communication region MN1b in the Z-axis direction. The dimension in the Z-axis direction is the length in the Z-axis direction.
The shape of the V1 end region MN1e has a substantially axisymmetric relationship with the shape of the V2 end region MN1a about the center of the introduction flow path SPV in a plan view in the W2 direction. Specifically, the surface of the V1 end region MN1e in the Z1 direction is composed of a surface of the case 385 and a surface of the communication plate 382. The surface in the Z1 direction of the case 385 in the V1 end region MN1e is a tapered surface. The surface in the Z1 direction of the communication plate 382 in the V1 end region MN1e is parallel to the VW plane. The V1 direction end of the Z1 direction surface of the case 385 in the V1 end region MN1e is located in the Z1 direction from the V2 direction end of the Z1 direction surface of the communication plate 382 in the V1 end region MN1e.

The description is returned to FIGS. 7 and 8. As illustrated in FIGS. 7 and 8, a diaphragm 384 is provided in the Z1 direction of the pressure chamber substrate 383. The diaphragm 384 is a plate-shaped member that is long in the V-axis direction and extends substantially parallel to the VW plane, and is a member that can vibrate elastically. The diaphragm 384 may be formed of the same member as the pressure chamber substrate 383.

As illustrated in FIGS. 7 and 8, on the surface of the diaphragm 384 in the Z1 direction, there are M piezoelectric elements PZ1 corresponding to one-to-one with M pressure chambers CB1 and M pressure chambers CB2. M piezoelectric elements PZ2 corresponding to one-to-one are provided. Hereinafter, the piezoelectric element PZ1 and the piezoelectric element PZ2 are collectively referred to as a piezoelectric element PZq. The piezoelectric element PZq is a passive element that deforms according to a change in the potential of the drive signal Com.

As illustrated in FIGS. 7 and 8, the wiring member 388 is mounted on the surface of the diaphragm 384 in the Z1 direction. The wiring member 388 will be described with reference to FIG.

FIG. 12 is a plan view and a side view of the wiring member 388. The wiring member 388 is configured to include a flexible base material 3880 and a plurality of wirings formed on the wiring forming surface 3887 of the base material 3880. The wiring member 388 is, for example, a COF substrate (Chip on Film), an FPC substrate (Flexible Printed Circuits), or the like, and the COF substrate is adopted in the present embodiment. The wiring member 388 exemplified in FIG. 12 is in a state where no external force is applied to the wiring member 388. Wiring for transmitting the control signal and the power supply voltage supplied from the wiring board 35 to the head unit 38 is formed on the wiring forming surface 3887.

The wiring member 388 includes an output terminal portion 3881, an input terminal portion 3882, and a relay portion 3883. As illustrated in FIG. 8, the output terminal portion 3881 and the input terminal portion 3882 are portions located at both ends of the wiring member 388. That is, in the wiring member 388, the relay unit 3883 is located between the output terminal unit 3881 and the input terminal unit 3882. In FIG. 8, the boundary L1 between the output terminal unit 3881 and the relay unit 3883 and the boundary L2 between the input terminal unit 3882 and the relay unit 3883 are illustrated.

As illustrated in FIG. 12, the width Wi2 of the input terminal portion 3882 is smaller than the width Wi1 of the output terminal portion 3881. Further, the width Wi2 is larger than half of the width Wi1.

Further, as illustrated in FIGS. 7 and 12, the wiring member 388 has a shape in which the input terminal portion 3882 is closer to one side with respect to the entire width of the wiring member 388. Specifically, in the example of FIG. 12, the input terminal portion 3882 is closer to the right side. More specifically, when viewed from the upper part of the wiring member 388, the right end of the input terminal portion 3882 and the right end of the output terminal portion 3881 overlap, but the left end of the input terminal portion 3882 is the left end of the output terminal portion 3881. It is located on the right side in comparison.

As illustrated in FIG. 12, a plurality of output terminals 3885 electrically connected to each piezoelectric element PZq are formed on the wiring forming surface 3887 of the output terminal portion 3881, and the wiring forming surface 3887 of the input terminal portion 3882 is formed. Is formed with a plurality of input terminals 3886 electrically connected to the wiring board 35. Further, a drive circuit 3884 is mounted on the relay unit 3883. The drive circuit 3884 uses the control signal SI and the power supply voltage supplied from the wiring board 35 to generate a drive signal Com for each piezoelectric element PZq. The drive signal Com generated by the drive circuit 3884 is supplied to the head unit 38 via the output terminal 3858. The drive circuit 3884 is an electric circuit that switches whether or not to supply the drive signal Com to the piezoelectric element PZq under the control of the control signal SI. The drive circuit 3884 supplies a drive signal Com to the upper electrode of the piezoelectric element PZq.

As illustrated in FIGS. 7 and 8, in the wiring member 388, the output terminal portion 3881 is bent at the boundary L1 with respect to the relay portion 3883, and the input terminal portion 3882 is bent at the boundary L2 with respect to the relay portion 3883. Ru. As illustrated in FIGS. 7 and 8, the wiring member 388 extends substantially parallel along the VZ plane. More specifically, the wiring member 388 extends from the diaphragm 384 toward the wiring board 35 in a state of being inclined with respect to the normal line of the diaphragm 384.

As illustrated in FIGS. 7 and 8, a case 385 is provided in the Z1 direction of the communication plate 382. The case 385 is a member long in the V-axis direction, and an ink flow path is formed. Specifically, one supply liquid chamber RB1 and one discharge liquid chamber RB2 are formed in the case 385. Of these, the supply liquid chamber RB1 communicates with the supply liquid chamber RA1 and is provided so as to extend in the V-axis direction in the Z1 direction when viewed from the supply liquid chamber RA1. Further, the discharge liquid chamber RB2 communicates with the discharge liquid chamber RA2 and is provided so as to extend in the V-axis direction in the Z1 direction when viewed from the discharge liquid chamber RA2 and in the W2 direction when viewed from the supply liquid chamber RB1. Be done.

Further, in the case 385, an introduction port 3851 communicating with the supply liquid chamber RB1, an outlet port 3852 communicating with the discharge liquid chamber RB2, a bypass port 3853a, a bypass port 3853b, a bypass port 3853c, and a bypass port 3853d are provided. , Are provided. Then, ink is supplied to the supply liquid chamber RB1 from the liquid container 93 to the supply-side common liquid chamber MN1 via the introduction port 3851. The ink supplied to the common liquid chamber MN1 on the supply side is the first bypass flow path BP1 via the individual flow path RJ, the bypass port 3853a and the bypass port 3853b, and the second bypass via the bypass port 3853c and the bypass port 3853d. It is stored in the discharge side common liquid chamber MN2 via any one of the flow paths BP2. The ink stored in the discharge-side common liquid chamber MN2 is collected via the outlet 3852.

Further, the case 385 is provided with an opening 3850. Inside the opening 3850, a pressure chamber substrate 383, a diaphragm 384, and a wiring member 388 are provided. The case 385 is formed, for example, by injection molding of a resin material. However, known materials and manufacturing methods can be arbitrarily adopted for the manufacture of the case 385.

The explanation is returned to FIG. Although the head unit 38_1 has been described with reference to FIGS. 7 to 11, the configuration of the head units 38_1 to 38_1 is also the same as the configuration of the head unit 38_1. However, the wiring members 388 of the head units 38_1, 38_3, and 38_5 are arranged so that the input terminal portion 3882 is closer to the V1 direction. On the other hand, the wiring members 388 of the head units 38_2, 38_4, and 38_6 are arranged so that the input terminal portion 3882 is closer to the V2 direction. The wiring members 388 of the head units 38_1 to 38_1 all have the same shape. The wiring members 388 of the head units 38_2, 38_4, and 38_6 are arranged in a direction rotated by 180 degrees with respect to the direction of the wiring member 388 of the head unit 38_1 with respect to the Z-axis direction. The wiring member 388 of the head unit 38_1 and the wiring member 388 of the head unit 38_1 are arranged so as to be point-symmetrical with each other. The wiring member 388 of the head unit 38_3 and the wiring member 388 of the head unit 38_4 are also arranged so as to be point-symmetrical with each other. The wiring member 388 of the head unit 38_5 and the wiring member 388 of the head unit 38_6 are also arranged so as to be point-symmetrical to each other.

The fixing plate 39 is adhered to the surface of the compliance substrate 3861 in the Z2 direction and the surface of the first flow path member Du1 in the Z2 direction. That is, the six exposed openings 391 provided on the fixed plate 39 expose the nozzle surface FN of the nozzle plate 387 within the exposed openings 391. The nozzle surface FN is a surface on which a plurality of nozzles N are formed and faces the Z2 direction of the nozzle plate 387, and is a surface perpendicular to the Z2 direction. The arrangement of each of the six exposed openings 391 is also staggered, similar to the openings 351 and notches 352 of the wiring board 35.

As shown in FIG. 8, the compliance substrate 3861 has a flexible film 3861a and a support plate 3861b. The flexible film 3861a is a flexible member, and a film made of a resin such as PPS can be adopted, and the support plate 3861b is a rigid member, for example, stainless steel can be adopted. can. The flexible film 3861a is fixed to the surface of the communication plate 382 in the Z2 direction, so that the supply liquid chamber RA1 of the communication plate 382, the communication flow path RX1, the communication flow path RK1, the communication flow path RK2, the communication flow path RX2, and the communication flow path RX2 are fixed. It is a member that covers the opening defining the discharge chamber RA2 from the Z2 direction side. In other words, the flexible film 3861a is a member that defines the supply liquid chamber RA1, the communication flow path RX1, the communication flow path RK1, the communication flow path RK2, the communication flow path RX2, and the discharge liquid chamber RA2. The support plate 3861b is fixed to the surface of the flexible film 3861a in the Z2 direction, and when viewed in the Z-axis direction, the supply liquid chamber RA1, the communication flow path RX1, the communication flow path RK1, the communication flow path RK2, the communication flow path RX2, and the communication flow path RX2. An opening is formed at a position overlapping the discharge chamber RA2. The fixing plate 39 is adhered to the support plate 3861b so as to seal the opening of the support plate 3861b from the Z2 direction. The space defined by the Z2 direction surface of the flexible film 3861a, the opening of the support plate 3861b, and the Z1 direction surface of the fixing plate 39 is communicated with the atmosphere by an atmospheric communication passage (not shown), and is possible by the space. By deforming the flexible film 3861a in the Z1 direction and the Z2 direction, it is possible to absorb the pressure fluctuation generated in the head unit 38.

1.3.4. The flow path flow path structure 34 and the flow path distribution unit 37 are provided with a first supply flow path Si1, a second supply flow path Si2, a first discharge flow path Do1, and a second discharge flow path Do2. Hereinafter, the first supply flow path Si1 and the second supply flow path Si2 are collectively referred to as supply flow path Si. Similarly, the first discharge flow path Do1 and the second discharge flow path Do2 are collectively referred to as a discharge flow path Do. The supply flow path Si is a flow path for supplying ink to the supply-side common liquid chambers MN1 of each of the plurality of head units 38. The discharge flow path Do is a flow path for discharging ink from the common liquid chambers MN2 on the discharge side of each of the plurality of head units 38.

FIG. 13 is a diagram showing an outline of a flow path formed by the flow path structure 34 and the flow path distribution unit 37. FIG. 13 shows a first supply flow path Si1, a second supply flow path Si2, a first discharge flow path Do1, and a second discharge flow path Do2. In the figure shown in FIG. 13, the direction perpendicular to the paper surface is the Z-axis direction. However, in order to prevent complication of the drawing, in the figure shown in FIG. 13, among the flow paths formed by the flow path structure 34 and the flow path distribution section 37, the flow path structure 34 and the flow path distribution section 37 The flow path formed between them and extending in the Z-axis direction is indicated so as to extend in the direction of 45 degrees to the upper right. Further, by displaying the length of this flow path so as to be longer than the original scale, in the figure shown in FIG. 13, the flow path structure 34 and the flow path distribution portion 37 are displayed so as not to overlap each other. be. Further, in FIG. 13, the display of the bypass flow path BP is omitted. Further, in FIG. 13, the first supply flow path Si1 and the second supply flow path Si2 are shown by a alternate long and short dash line, and the first discharge flow path Do1 and the second discharge flow path Do2 are shown by broken lines.

The first supply flow path Si1 is a flow path for supplying the first ink to the head units 38_1, 38_3, and 38_5. The first supply flow path Si1 has a supply common flow path SCi1, a connection pipe 373i1, and a supply distribution flow path SDi1. The second supply flow path Si2 is a flow path for supplying the second ink to the head units 38_2, 38_4, and 38_6. The second supply flow path Si2 has a supply common flow path SCi2, a connection pipe 373i2, and a supply distribution flow path SDi2.

The first discharge flow path Do1 is a flow path for discharging the first ink from the head units 38_1, 38_3, and 38_5. The first discharge flow path Do1 includes the discharge merging flow path DUo1, the connection pipe 373o_1, the discharge individual flow path DSo1_1, the connection pipe 373o_3, the discharge individual flow path DSo1_3, the connection pipe 373o_5, and the discharge individual flow path DSo1_5. Have.

The second discharge flow path Do2 is a flow path for discharging the second ink from the head units 38_2, 38_4, and 38_6. The second discharge flow path Do2 includes the discharge merging flow path DUo2, the connection pipe 373o_2, the discharge individual flow path DSo2_2, the connection pipe 373o_4, the discharge individual flow path DSo2_4, the connection pipe 373o_6, and the discharge individual flow path DSo2_6. Have.

The supply common flow path SCi1, the supply common flow path SCi2, the discharge merging flow path DUo1, and the discharge merging flow path DUo2 are formed in the flow path structure 34. Supply distribution flow path SDi1, supply distribution flow path SDi2, discharge individual flow path DSo1_1, discharge individual flow path DSo1_3, discharge individual flow path DSo1_5, discharge individual flow path DSo2_2, discharge individual flow path DSo2_4, and discharge. The individual flow path DSo2_6 is formed in the flow path distribution unit 37.

Of the flow paths formed by the flow path structure 34 and the flow path distribution section 37, the flow path formed in the flow path structure 34 will be described with reference to FIG. 14, and will be formed by the flow path distribution section 37. The flow path will be described with reference to FIGS. 15, 16, and 17.

FIG. 14 is a diagram showing a flow path formed in the flow path structure 34. The figure shown in FIG. 14 is a plan view of the flow path structure 34 seen in the Z2 direction. The flow path structure 34 is formed with a common supply flow path SCi1, a common supply flow path SCi2, a discharge merging flow path DUo1, and a discharge merging flow path DUo2. Further, the flow path structure 34 has a filter RF1 and a filter RF2 in addition to the connection pipes 341i1, 341i2, 341o1 and 341o2 described above. Hereinafter, the filter RF1 and the filter RF2 are collectively referred to as a filter RF.

The connecting pipes 341i1, 341i2, 341o1 and 341o2 are provided so as to project on the surface of the flow path plate Su1 facing the Z1 direction. The connection tube 341i1 is a tube body constituting a flow path for supplying the first ink to the flow path plate Su1. Further, the connecting pipe 341i2 is a pipe body constituting a flow path for supplying the second ink to the flow path plate Su1. On the other hand, the connection tube 341o1 is a tube body constituting a flow path for discharging the first ink from the flow path plate Su1. Further, the connecting pipe 341o2 is a pipe body constituting a flow path for discharging the second ink from the flow path plate Su1.

The filter RF is a plate-shaped or sheet-shaped member that captures foreign matter and the like mixed in the ink while allowing the ink to pass through. The filter RF is composed of metal fibers such as, for example, twill weave or flat tatami mat weave. The filter RF is not limited to the structure using metal fibers, and may be made of resin fibers such as a non-woven fabric, for example. The filter RF is typically arranged so as to be parallel to the XY plane.

The supply common flow path SCi1 and the supply common flow path SCi2 are arranged so as to be point-symmetrical about the center of gravity G34 of the flow path structure 34. Similarly, the discharge merging flow path DUo1 and the discharge merging flow path DUo2 are arranged so as to be point-symmetrical about the center of gravity G34 of the flow path structure 34.

The supply common flow path SCi1 communicates with the connection pipe 341i1 via the filter RF1. Further, the supply common flow path SCi1 extends in the Y-axis direction and has a discharge port CE1 in the vicinity of the end portion in the Y2 direction. Further, a part of the supply common flow path SCi1 is arranged along the side He8. The discharge port CE1 communicates with the connecting pipe 373i1. Further, the discharge port CE1 is located in the vicinity of the apex when the side He1 and the side He8 intersect.

The supply common flow path SCi2 communicates with the connection pipe 341i2 via the filter RF2. Further, the supply common flow path SCi2 extends in the Y-axis direction and has a discharge port CE2 in the vicinity of the end portion in the Y1 direction. Further, a part of the supply common flow path SCi2 is arranged along the side He4. The discharge port CE2 communicates with the connection pipe 373i2. Further, the discharge port CE2 is located in the vicinity of the apex when the side He4 and the side He5 intersect.

The discharge merging flow path DUo1 has a discharge flow path portion DP1_11, a discharge flow path portion DP1_12, a discharge flow path portion DP1_3, a discharge flow path portion DP1_51, a discharge flow path portion DP1_52, and a discharge flow path portion DP1_U. .. The discharge flow path portion DP1_1 extends in the Y-axis direction, communicates with the discharge flow path portion DP1_1 at the end in the Y1 direction, and has an introduction port CI1-1 in the vicinity of the end in the Y2 direction. The introduction port CI1_1 communicates with the connection pipe 373o_1. The discharge flow path portion DP1_12 extends in the X-axis direction, communicates with the discharge flow path portion DP1_11 at the end in the X1 direction, and communicates with the discharge flow path portion DP1_U at the end in the X2 direction. The discharge flow path portion DP1_3 extends in the Y-axis direction, communicates with the discharge flow path portion DP1_U at the end portion in the Y1 direction, and has an introduction port CI1_3 in the vicinity of the end portion in the Y2 direction. The introduction port CI1_3 communicates with the connection pipe 373o_3. The discharge flow path portion DP1_51 extends in the U-axis direction, communicates with the discharge flow path portion DP1_52 at the end in the U1 direction, and has an introduction port CI1_5 in the vicinity of the end in the U2 direction. Further, the introduction port CI1_5 is provided in the vicinity of the side He2. The U-axis direction is a general term for the U1 direction and the U2 direction. The U1 direction is a direction rotated about 45 degrees clockwise in the X1 direction. The U2 direction is the opposite direction to the U1 direction. The discharge flow path portion DP1_52 extends in the X-axis direction, communicates with the discharge flow path portion DP1_U at the end in the X1 direction, and communicates with the discharge flow path portion DP1_51 at the end in the X2 direction. The discharge flow path portion DP1_U communicates with the connection pipe 341o1 at the end in the Z1 direction, communicates with the discharge flow path portion DP1_12 at the end in the X1 direction, and communicates with the discharge flow path portion DP1_3 at the end in the Y2 direction. It communicates with the discharge flow path portion DP1_52 at the end in the X2 direction. The discharge flow path portion DP1_U is a place where the ink flowing from the discharge flow path portion DP1_12, the discharge flow path portion DP1_3, and the discharge flow path portion DP1_52 joins. The merged ink flows to the connecting tube 341o2.

The discharge merging flow path DUo2 has a discharge flow path portion DP2_21, a discharge flow path portion DP2_22, a discharge flow path portion DP2_4, a discharge flow path portion DP2_61, a discharge flow path portion DP2_62, and a discharge flow path portion DP2_U. .. The discharge flow path portion DP2_21 extends in the U-axis direction, has an introduction port CI2_2 in the vicinity of the end in the U1 direction, and communicates with the discharge flow path portion DP2_22 at the end in the U2 direction. The introduction port CI2_2 communicates with the connecting pipe 373o_2. Further, the introduction port CI2_2 is provided in the vicinity of the side He6. The discharge flow path portion DP2_22 extends in the X-axis direction, communicates with the discharge flow path portion DP2_U at the end in the X2 direction, and communicates with the discharge flow path portion DP2_21 at the end in the X1 direction. The discharge flow path portion DP2_4 extends in the Y-axis direction, has an introduction port CI2_4 in the vicinity of the end portion in the Y1 direction, and communicates with the discharge flow path portion DP2_U at the end portion in the Y2 direction. The introduction port CI2_4 communicates with the connection pipe 373o_4. The discharge flow path portion DP2_61 extends in the Y-axis direction, has an introduction port CI2_6 in the vicinity of the end in the Y1 direction, and communicates with the discharge flow path portion DP2_62 at the end in the Y2 direction. The introduction port CI2_6 communicates with the connecting pipe 373o_6. The discharge flow path portion DP2_62 extends in the X-axis direction, communicates with the discharge flow path portion DP2_U at the end in the X1 direction, and communicates with the discharge flow path portion DP2_61 at the end in the X2 direction. The discharge flow path portion DP2_U communicates with the connection pipe 341o2 at the end in the Z1 direction, communicates with the discharge flow path portion DP2_22 at the end in the X1 direction, and communicates with the discharge flow path portion DP2_4 at the end in the Y1 direction. It communicates with the discharge flow path portion DP2_62 at the end in the X2 direction. The discharge channel portion DP2_U is a location where the ink flowing from the discharge channel portion DP2_22, the discharge channel portion DP2_4, and the discharge channel portion DP2_62 merge. The merged ink flows into the connecting tube 341o2.

15 and 16 are views of the flow path formed in the flow path distribution section 37. The figure shown in FIG. 15 is a perspective view showing a flow path formed in the flow path distribution unit 37. The figure shown in FIG. 16 is a plan view showing a flow path formed in the flow path distribution unit 37. In FIGS. 15 and 16, the head unit 38 and the fixing plate 39 are further displayed. Further, in FIG. 15, in order to prevent the drawing from being complicated, a reference numeral is given only to a part of the bypass flow path BPs among the plurality of bypass flow path BPs. In a plan view, the outer shapes of the flow path distribution portion 37 and the fixing plate 39 are substantially the same as the outer shapes of the flow path structure 34. Therefore, in order to simplify the explanation, each of the eight sides of the outer shape of the flow path distribution unit 37 and the fixing plate 39 is placed at substantially the same position from the sides He1 to the side He8 of the outer shape of the flow path structure 34. It will be described using the same code as the code of a certain side.

As illustrated in FIG. 15, the connecting pipe 373i1 extends in the Z-axis direction, communicates with the discharge port CE1 at the end in the Z1 direction, and communicates with the supply / distribution flow path SDi1 at the end in the Z2 direction. As illustrated in FIG. 15, the supply distribution flow path SDi1 has a distribution flow path SPH1, an introduction flow path SPV_1, an introduction flow path SPV_3, and an introduction flow path SPV_5.

The distribution flow path SPH1 is formed by the first flow path member Du1 and the second flow path member Du2. Further, the distribution flow path SPH1 distributes and supplies the first ink to a plurality of supply-side common liquid chambers MN1 corresponding to the head units 38_1, 38_3, and 38_5, respectively. As illustrated in FIG. 16, the distribution flow path SPH1 includes a distribution flow path portion SP1_11, a distribution flow path portion SP1_12, a distribution flow path portion SP1_31, a distribution flow path portion SP1_32, and a distribution flow path portion SP1_51. It has a flow path portion SP1_52, a distribution flow path portion SP1_53, a distribution flow path portion SP1_U1, and a distribution flow path portion SP1_U2.

The distribution flow path portion SP1_1 extends in the V-axis direction, communicates with the introduction flow path SPV_1 at the end in the V1 direction, and communicates with the distribution flow path portion SP1_1 at the end in the V2 direction. The distribution flow path portion SP1_11 is located in the vicinity of the side He7 and is provided along the side He7. The introduction flow path SPV_1 extends in the Z-axis direction, communicates with the distribution flow path portion SP1_1 at the end in the Z1 direction, and communicates with the supply-side common liquid chamber MN1 of the head unit 38_1 at the end in the Z2 direction. The distribution flow path portion SP1_12 extends in the Y-axis direction, communicates with the distribution flow path portion SP1_11 at the end in the Y1 direction, and communicates with the distribution flow path portion SP1_U1 at the end in the Y2 direction. The distribution flow path portion SP1_12 is located in the vicinity of the side He8 and is provided along the side He8.

The distribution flow path portion SP1_31 extends in the V-axis direction, communicates with the introduction flow path SPV_3 at the end in the V1 direction, and communicates with the distribution flow path portion SP1_32 at the end in the V2 direction. The introduction flow path SPV_3 extends in the Z-axis direction, communicates with the distribution flow path portion SP1_31 at the end in the Z1 direction, and communicates with the supply-side common liquid chamber MN1 of the head unit 38_3 at the end in the Z2 direction. The distribution flow path portion SP1_32 extends in the Y-axis direction, communicates with the distribution flow path portion SP1_31 at the end in the Y1 direction, and communicates with the distribution flow path portion SP1_U2 at the end in the Y2 direction.

The distribution flow path portion SP1_51 extends in the V-axis direction, communicates with the introduction flow path SPV_5 at the end in the V1 direction, and communicates with the distribution flow path portion SP1_52 at the end in the V2 direction. The introduction flow path SPV_5 extends in the Z-axis direction, communicates with the distribution flow path portion SP1_51 at the end in the Z1 direction, and communicates with the supply-side common liquid chamber MN1 of the head unit 38_5 at the end in the Z2 direction. The distribution flow path portion SP1_52 is bent approximately 124 degrees so as to be convex in the V2 direction, communicates with the distribution flow path portion SP1_51 at the end in the V1 direction, and communicates with the distribution flow path portion SP1_53 at the end in the X1 direction. Communicate. The distribution flow path portion SP1_53 extends in the X-axis direction, communicates with the distribution flow path portion SP1_52 at the end in the X2 direction, and communicates with the distribution flow path portion SP1_U2 at the end in the X1 direction. The distribution flow path portion SP1_53 is arranged in the vicinity of the side He1.

The distribution flow path portion SP1_U1 communicates with the connection pipe 373i1 at the end in the Z1 direction, communicates with the distribution flow path portion SP1_12 at the end in the Y1 direction, and communicates with the distribution flow path portion SP1_U2 at the end in the X2 direction. The distribution flow path portion SP1_U1 is a place where the first ink flowing from the connection pipe 373i1 is distributed to the distribution flow path portion SP1_12 and the distribution flow path portion SP1_U2. The distribution flow path portion SP1_U1 is located in the vicinity of the apex when the side He1 and the side He8 intersect.

The distribution flow path portion SP1_U2 extends in the X-axis direction, communicates with the distribution flow path portion SP1_U1 at the end in the X1 direction, and communicates with the distribution flow path portion SP1_32 and the distribution flow path portion SP1_53 at the end in the X2 direction. .. The end portion of the distribution flow path portion SP1_U2 in the X2 direction is a place where the first ink flowing from the distribution flow path portion SP1_U1 is distributed to the distribution flow path portion SP1_32 and the distribution flow path portion SP1_53. The distribution flow path portion SP1_U2 is located in the vicinity of the side He1 and is provided along the side He1.

As illustrated in FIG. 15, the connecting pipe 373i2 extends in the Z-axis direction, communicates with the discharge port CE2 at the end in the Z1 direction, and communicates with the supply / distribution flow path SDi2 at the end in the Z2 direction. As illustrated in FIG. 15, the supply distribution flow path SDi2 has a distribution flow path SPH2, an introduction flow path SPV_2, an introduction flow path SPV_4, and an introduction flow path SPV_6.

The distribution flow path SPH2 distributes and supplies the second ink to a plurality of supply-side common liquid chambers MN1 corresponding to the head units 38_2, 38_4, and 38_6, respectively. As illustrated in FIG. 16, the distribution flow path SPH2 includes a distribution flow path portion SP2_21, a distribution flow path portion SP2_22, a distribution flow path portion SP2_23, a distribution flow path portion SP2_41, and a distribution flow path portion SP2_42. It has a flow path portion SP2_61, a distribution flow path portion SP2_62, a distribution flow path portion SP2_U1, and a distribution flow path portion SP2_U2.

The distribution flow path portion SP2_21 extends in the V-axis direction, communicates with the introduction flow path SPV_2 at the end in the V2 direction, and communicates with the distribution flow path portion SP2_22 at the end in the V1 direction. The introduction flow path SPV_2 extends in the Z-axis direction, communicates with the distribution flow path portion SP2_21 at the end in the Z1 direction, and communicates with the supply-side common liquid chamber MN1 of the head unit 38_2 in the Z2 direction. The distribution flow path portion SP2_22 is bent approximately 124 degrees so as to be convex toward the V1 direction, communicates with the distribution flow path portion SP2_21 at the end in the V2 direction, and communicates with the distribution flow path portion SP2_23 at the end in the X2 direction. Communicate. The distribution flow path portion SP2_23 extends in the X-axis direction, communicates with the distribution flow path portion SP2_22 at the end in the X1 direction, and communicates with the distribution flow path portion SP2_U2 at the end in the X2 direction. The distribution flow path portion SP2_23 is located in the vicinity of the side He5 and is provided along the side He5.

The distribution flow path portion SP2_41 extends in the V-axis direction, communicates with the introduction flow path SPV_4 at the end in the V2 direction, and communicates with the distribution flow path portion SP2_42 at the end in the V1 direction. The introduction flow path SPV_4 extends in the Z-axis direction, communicates with the distribution flow path portion SP2_41 at the end in the Z1 direction, and communicates with the supply-side common liquid chamber MN1 of the head unit 38_4 in the Z2 direction. The distribution flow path portion SP2_42 extends in the Y-axis direction, communicates with the distribution flow path portion SP2_41 at the end in the Y2 direction, and communicates with the distribution flow path portion SP2_U2 at the end in the Y1 direction.

The distribution flow path portion SP2_61 extends in the V-axis direction, communicates with the introduction flow path SPV_6 at the end in the V2 direction, and communicates with the distribution flow path portion SP2_62 at the end in the V1 direction. The distribution flow path portion SP2_61 is provided in the vicinity of the side He3 and along the side He3. The introduction flow path SPV_6 extends in the Z-axis direction, communicates with the distribution flow path portion SP2_61 at the end in the Z1 direction, and communicates with the supply-side common liquid chamber MN1 of the head unit 38_6 in the Z2 direction. The distribution flow path portion SP2_62 extends in the Y-axis direction, communicates with the distribution flow path portion SP2_61 at the end in the Y2 direction, and communicates with the distribution flow path portion SP2_U1 at the end in the Y1 direction. The distribution flow path portion SP2_62 is in the vicinity of the side He4 and is provided along the side He4.

The distribution flow path portion SP2_U1 communicates with the connection pipe 373i2 at the end in the Z1 direction, communicates with the distribution flow path portion SP2_62 at the end in the Y2 direction, and communicates with the distribution flow path portion SP2_U2 at the end in the X1 direction. The distribution flow path portion SP2_U1 is a place where the second ink flowing from the connection pipe 373i2 is distributed to the distribution flow path portion SP2_62 and the distribution flow path portion SP2_U2. The distribution flow path portion SP1_U2 is located in the vicinity of the apex when the side He4 and the side He5 intersect.

The distribution flow path portion SP2_U2 extends in the X-axis direction, communicates with the distribution flow path portion SP2_U1 at the end in the X2 direction, and communicates with the distribution flow path portion SP2_42 and the distribution flow path portion SP2_23 at the end in the X1 direction. .. The end portion of the distribution flow path portion SP2_U2 in the X1 direction is a place where the second ink flowing from the distribution flow path portion SP2_U1 is distributed to the distribution flow path portion SP2_42 and the distribution flow path portion SP2_23. The distribution flow path portion SP2_U2 is located in the vicinity of the side He5 and is provided along the side He5.

As illustrated in FIG. 15, the discharge individual flow path DSo1_1 has a discharge horizontal flow path DSH_1 and a lead-out flow path DSV_1. As illustrated in FIG. 16, the discharge horizontal flow path DSH_1 is bent approximately 90 degrees so as to be convex in the Y2 direction, communicates with the lead flow path DSV_1 at the end in the V1 direction, and connects at the end in the W2 direction. It communicates with the pipe 373o_1. The lead-out flow path DSV_1 extends in the Z-axis direction, communicates with the discharge-side common liquid chamber MN2 of the head unit 38_1 at the end in the Z2 direction, and communicates with the discharge horizontal flow path DSH_1 at the end in the Z1 direction.

As illustrated in FIG. 15, the discharge individual flow path DSo2_2 has a discharge horizontal flow path DSH_2 and a lead-out flow path DSV_2. As illustrated in FIG. 16, the discharge horizontal flow path DSH_2 is bent approximately 90 degrees so as to be convex in the Y1 direction, communicates with the lead flow path DSV_2 at the end in the V2 direction, and connects at the end in the W1 direction. It communicates with pipe 373o_2. The lead-out flow path DSV_2 extends in the Z-axis direction, communicates with the discharge-side common liquid chamber MN2 of the head unit 38_2 at the end in the Z2 direction, and communicates with the discharge horizontal flow path DSH_2 at the end in the Z1 direction.

As illustrated in FIG. 15, the discharge individual flow path DSo1_3 has a discharge horizontal flow path DSH_3 and a lead-out flow path DSV_3. As illustrated in FIG. 16, the discharge horizontal flow path DSH_3 is bent approximately 90 degrees so as to be convex in the Y2 direction, communicates with the lead flow path DSV_3 at the end in the V1 direction, and connects at the end in the W2 direction. It communicates with pipe 373o_3. The lead-out flow path DSV_3 extends in the Z-axis direction, communicates with the discharge-side common liquid chamber MN2 of the head unit 38_3 at the end in the Z2 direction, and communicates with the discharge horizontal flow path DSH_3 at the end in the Z1 direction.

As illustrated in FIG. 15, the discharge individual flow path DSo2_4 has a discharge horizontal flow path DSH_4 and a lead-out flow path DSV_4. As illustrated in FIG. 16, the discharge horizontal flow path DSH_4 is bent approximately 90 degrees so as to be convex in the Y1 direction, communicates with the lead flow path DSV_4 at the end in the V2 direction, and connects at the end in the W1 direction. It communicates with pipe 373o_4. The lead-out flow path DSV_4 extends in the Z-axis direction, communicates with the discharge-side common liquid chamber MN2 of the head unit 38_4 at the end in the Z2 direction, and communicates with the discharge horizontal flow path DSH_4 at the end in the Z1 direction.

As illustrated in FIG. 15, the discharge individual flow path DSo1_5 has a discharge horizontal flow path DSH_5 and a lead-out flow path DSV_5. As illustrated in FIG. 16, the discharge horizontal flow path DSH_5 is bent approximately 90 degrees so as to be convex in the Y2 direction, communicates with the lead flow path DSV_5 at the end in the V1 direction, and connects at the end in the W2 direction. Communicate with pipe 373o_5. The lead-out flow path DSV_5 extends in the Z-axis direction, communicates with the discharge-side common liquid chamber MN2 of the head unit 38_5 at the end in the Z2 direction, and communicates with the discharge horizontal flow path DSH_5 at the end in the Z1 direction.

As illustrated in FIG. 15, the discharge individual flow path DSo2_6 has a discharge horizontal flow path DSH_6 and a lead-out flow path DSV_6. As illustrated in FIG. 16, the discharge horizontal flow path DSH_6 is bent approximately 90 degrees so as to be convex in the Y1 direction, communicates with the lead flow path DSV_6 at the end in the V2 direction, and connects at the end in the W1 direction. It communicates with pipe 373o_6. The lead-out flow path DSV_6 extends in the Z-axis direction, communicates with the discharge-side common liquid chamber MN2 of the head unit 38_6 at the end in the Z2 direction, and communicates with the discharge horizontal flow path DSH_6 at the end in the Z1 direction.

As illustrated in FIG. 16, each of the bypass horizontal portions BP1H_2, BP1H_4, BP1H_6, BP2H_1, BP2H_3 and BP2H_5 does not overlap with the case 385 of the head unit 38 corresponding to each of the bypass horizontal portions BPH in a plan view. Has. In FIG. 16, the boundary of the case 385 overlapping the bypass horizontal portion BPH in a plan view is shown by a broken line. Further, each of the bypass horizontal portions BP1H_1, BP1H_3, BP1H_5, BP2H_2, BP2H_4 and BP2H_6 overlaps with the case 385 of the head unit 38 corresponding to each of the bypass horizontal portions BPH in all parts in a plan view.
That is, in the head unit 38_k, of the bypass horizontal portions BP1H_k and BP2H_k, the bypass horizontal portion BPH located at a distance far from the outer edge in the Y-axis direction of the flow path distribution portion 37 overlaps with the case 385 of the head unit 38_k in a plan view. The bypass horizontal portion BPH, which has a portion that does not form and is located at a short distance from the outer edge of the flow path distribution portion 37 in the Y-axis direction, overlaps with the case 385 of the head unit 38_k in all parts in a plan view. k is an integer from 1 to 6.

FIG. 17 is a perspective view of the first flow path member Du1. As illustrated in FIG. 17, the distribution flow path SPH1, the distribution flow path SPH2, the discharge horizontal flow paths DSH_1 to DSH_6, and the bypass horizontal portions BP1H_1 to BP1H_6 are on the surface of the first flow path member Du1 in the Z1 direction. , A groove defining the bypass horizontal portions BP2H_1 to BP2H_6 is formed. Although not shown, the distribution flow path SPH1, the distribution flow path SPH2, the discharge horizontal flow paths DSH_1 to DSH_6, the bypass horizontal portions BP1H_1 to BP1H_6, and the bypass are on the surface of the second flow path member Du2 in the Z2 direction. A groove defining the horizontal portions BP2H_1 to BP2H_6 is formed. In other words, the distribution flow path SPH1, the distribution flow path SPH2, the discharge horizontal flow paths DSH_1 to DSH_6, the bypass horizontal portions BP1H_1 to BP1H_6, and the bypass horizontal portions BP2H_1 to BP2H_6 are the first flow path member Du1 and the second. It is formed between the flow path member Du2 and the flow path member Du2. The groove defining the distribution flow path SPH1, the distribution flow path SPH2, the discharge horizontal flow paths DSH_1 to DSH_6, the bypass horizontal portions BP1H_1 to BP1H_6, and the bypass horizontal portions BP2H_1 to BP2H_6 is the first flow path member Du1. And the configuration may be formed only in one of the second flow path members Du2.

1.4. Summary of First Embodiment As described above, the liquid injection head 30 includes a nozzle row Ln, a plurality of individual flow paths RJ, a supply side common liquid chamber MN1, a discharge side common liquid chamber MN2, and a first bypass. It includes a flow path BP1, a second bypass flow path BP2, and an introduction flow path SPV. The nozzle row Ln is configured such that a plurality of nozzles N for ejecting ink in the Z2 direction are arranged side by side in the V2 direction orthogonal to the Z2 direction. The plurality of individual flow paths RJ communicate with each of the plurality of nozzles N. The common liquid chamber MN1 on the supply side extends in the Z2 direction and communicates with the plurality of individual flow paths RJs to supply ink to the plurality of individual flow paths RJs. The ink discharged from the plurality of individual flow paths RJ flows through the common liquid chambers MN2 and V2 on the discharge side and communicates with the plurality of individual flow paths RJs. The first bypass flow path BP1 connects the supply-side common liquid chamber MN1 and the discharge-side common liquid chamber MN2. The second bypass flow path BP2 connects the supply-side common liquid chamber MN1 and the discharge-side common liquid chamber MN2. The introduction flow path SPV communicates with the supply side common liquid chamber MN1 between the first bypass flow path BP1 and the second bypass flow path BP2 in the V2 direction. The first bypass flow path BP1 has a supply-side vertical portion BP1VS extending from the supply-side common liquid chamber MN1 in the Z1 direction opposite to the Z2 direction. The second bypass flow path BP2 has a supply-side vertical portion BP2VS extending in the Z1 direction from the supply-side common liquid chamber MN1. As illustrated in FIG. 9, the supply-side vertical portion BP1VS is located in the V1 direction opposite to the V2 direction with respect to the individual flow path RJ arranged in the most V2 direction. The supply-side vertical portion BP2VS is located in the V2 direction with respect to the individual flow path RJ arranged in the most V1 direction.
In other words, the supply-side vertical portion BP1VS and the supply-side vertical portion BP2VS are located inside the longitudinal end of the supply-side common liquid chamber MN1.
The Z2 direction is an example of the "first direction". The V2 direction is an example of the "second direction". The Z1 direction is an example of the "third direction". The supply-side vertical portion BP1VS is an example of the “first vertical portion”. The supply-side vertical portion BP2VS has a "second vertical portion". The V1 direction is an example of the "fourth direction". However, the second direction is not limited to the V2 direction, and may be the V1 direction. When the second direction is the V2 direction, the fourth direction corresponds to the V1 direction, the first vertical portion corresponds to the supply side vertical portion BP2VS, and the second vertical portion corresponds to the supply side vertical portion BP1VS.

Generally, the bypass flow path BP is preferably provided at a position away from the introduction flow path SPV in order to collect air bubbles in the ink. By providing the bypass flow path BP at a position away from the introduction flow path SPV, ink flows also at a position away from the introduction flow path SPV, and the stagnant air bubbles in the common liquid chamber MN1 on the supply side can be recovered. Is. However, in the first embodiment in which the supply-side vertical portion BP1VS is arranged in the V2 direction rather than the individual flow path RJ arranged in the most V2 direction, the nozzle surface FN is supplied when it is inclined with respect to the horizontal plane SF. Bubbles may stay near the opening of the side vertical portion BP1VS.

FIG. 18 is a diagram showing a case where the nozzle surface FN is tilted in the first embodiment. The figure shown in FIG. 18 shows the end portion of the supply-side common liquid chamber MN1 in the V2 direction in a state where the nozzle surface FN is tilted by 60 degrees with respect to the horizontal plane SF in the above-mentioned first embodiment. In the state shown in FIG. 18 and FIGS. 19, 20, and 21 described later, the V2 direction is a direction rotated by 60 degrees in the direction opposite to the gravitational direction with respect to the horizontal plane SF, and is the direction opposite to the gravitational direction. Has the components of. The W-axis direction is parallel to the horizontal plane SF. In FIG. 18 and FIGS. 19, 20, and 21 described later, the nozzle plate 387 is shown by a broken line, and the fixing plate 39 and the support plate 3861b of the compliance substrate 3861 are not shown. Further, in FIG. 18 and FIGS. 19, 20, and 21 described later, only the nozzle N arranged in the V2 direction is shown.

As shown in FIG. 18, the nozzle N located most in the V2 direction is located in the V1 direction with respect to the wall surface of the supply-side vertical portion BP1VS in the V2 direction. Then, the ink flows as shown by the arrow Ar1 shown in FIG. Specifically, among the inks flowing along the V2 direction in the common liquid chamber MN1 on the supply side, the ink flowing into the individual flow path RJ communicating with the nozzle N located in the most V2 direction is the ink flowing into the supply side vertical portion BP1VS. The ink that flows in the Z2 direction in front of the wall surface in the V2 direction (on the V1 direction side) and flows into the supply side vertical portion BP1VS changes the flow in the Z1 direction. In the region Ra shown in FIG. 18, since the ink flow from the supply-side common liquid chamber MN1 to the supply-side vertical portion BP1VS is weak, the flow rate of the ink decreases, and the flow of ink flowing into the individual flow path RJ occurs. Since there is no area, stagnation occurs in the ink flow. Further, when the nozzle surface FN is inclined with respect to the horizontal plane SF, the bubbles generated in the common liquid chamber MN1 on the supply side move in the direction opposite to the direction of gravity due to the buoyancy, and therefore tend to stay in the region Ra. When the pressure chamber CB becomes a negative pressure due to the ink injection operation, ink is drawn from the supply side common liquid chamber MN1, but when the ink is drawn, there is a possibility that air bubbles staying in the supply side common liquid chamber MN1 are also drawn at the same time. When bubbles are drawn into the individual flow path RJ, the bubbles cause injection abnormalities.

FIG. 19 is a diagram showing a supply-side common liquid chamber MN1 when the nozzle surface FN is tilted in the present embodiment. The figure shown in FIG. 19 shows the end portion of the supply-side common liquid chamber MN1 in the V2 direction in a state where the nozzle surface FN is tilted by 60 degrees with respect to the horizontal plane SF in the present embodiment.

The ink flows as indicated by the arrow Ar2 shown in FIG. Specifically, among the inks flowing along the V2 direction in the common liquid chamber MN1 on the supply side, the ink flowing in the individual flow path RJ communicating with the nozzle N arranged in the most V2 direction is the ink flowing in the vertical portion BP1VS on the supply side. The ink that flows further in the V2 direction than the wall surface in the V2 direction and flows in the supply-side vertical portion BP1VS flows in the Z1 direction. That is, since ink flows in the V2 direction toward the end of the supply-side common liquid chamber MN1 in the V2 direction, the occurrence of ink stagnation at the end of the supply-side common liquid chamber MN1 in the V2 direction is reduced. can.

Further, in the present embodiment, since the surface of the V2 end region MN1a in the Z1 direction is a tapered surface, the surface of the V2 end region MN1a in the Z1 direction is not a tapered surface but parallel to the V-axis direction. Compared with the example, the occurrence of ink stagnation can be reduced.

FIG. 20 is a diagram showing a supply-side common liquid chamber MN1 when the nozzle surface FN is tilted in the second embodiment. The figure shown in FIG. 20 shows the end portion of the supply-side common liquid chamber MN1 in the V2 direction in a state where the nozzle surface FN is tilted by 60 degrees with respect to the horizontal plane SF in the above-mentioned second embodiment.

The ink flows as indicated by the arrow Ar3 shown in FIG. Specifically, among the inks flowing in the supply-side common liquid chamber MN1 along the V2 direction, the ink flowing into the individual flow path RJ changes the flow direction in the Z2 direction and flows into the supply-side vertical portion BP1VS. The ink changes the direction of flow in the Z1 direction in front of the region Rb (on the V1 direction side). In the second embodiment, in the region Rb shown in FIG. 20, among the inks flowing along the V2 direction in the common liquid chamber MN1 on the supply side, the flow of the ink flowing into the individual flow path RJ and the vertical portion BP1VS on the supply side. Since it is a region where the flow of ink flowing into the ink does not occur, stagnation is likely to occur.

On the other hand, in the present embodiment, since the surface of the V2 end region MN1a in the Z1 direction is a tapered surface, there is no place where the flow rate of the ink decreases, and the occurrence of stagnation can be reduced. In order to suppress a decrease in the flow velocity of the ink, a corner portion between the Z1 direction surface of the V2 end region MN1a and the V2 direction surface of the supply side vertical portion BP1VS is formed in an R shape.

Further, in the present embodiment, in the plan view, the introduction flow path SPV is located at the midpoint between the end of the supply-side common liquid chamber MN1 in the V1 direction and the end in the V2 direction, and the lead-out flow path DSV is common to the discharge side. It is located at the midpoint between the end of the liquid chamber MN2 in the V1 direction and the end in the V2 direction. In other words, the length in the V-axis direction from the introduction flow path SPV to the nozzle N farthest from the introduction flow path SPV is approximately half the length in the V-axis direction of the supply-side common liquid chamber MN1, and is the farthest from the lead-out flow path DSV. The length in the V-axis direction to the nozzle N is approximately half the length in the V-axis direction of the discharge-side common liquid chamber MN2. Generally, when the supply-side common liquid chamber MN1 and the discharge-side common liquid chamber MN2 become long, the resistance increases, and the pressure fluctuation of the ink at the time of injection near the nozzle N away from the introduction flow path SPV and the take-out flow path DSV becomes large. growing. When the pressure fluctuation of the ink becomes large, in other words, when the pressure of the ink in the nozzle N near the nozzle N away from the introduction flow path SPV and the take-out flow path DSV becomes low, bubbles may be mixed from the nozzle N. As described above, in the present embodiment, the length in the V-axis direction from the introduction flow path SPV to the nozzle N farthest from the introduction flow path SPV is the introduction flow in the embodiment in which the introduction flow path SPV is at one end of the common liquid chamber MN1 on the supply side. Since it is shorter than the length in the V-axis direction from the path SPV to the nozzle N farthest from it, the resistance to the vicinity of the nozzle N farthest from the introduction flow path SPV becomes small, and the pressure fluctuation of the ink can be reduced.

Further, in the supply-side vertical portion BP1VS, as illustrated in FIG. 10, the supply-side common liquid chamber MN1 is arranged in the region Re1, region Re2, region Re3, and region Re4 in parallel with the plane perpendicular to the V2 direction. When it is evenly divided into two regions, it is located in the region Re1 which is most located in the V2 direction. The supply-side vertical portion BP2VS is located in the region Re4 located most in the V1 direction when the supply-side common liquid chamber MN1 is evenly divided into the above-mentioned four regions in parallel with the plane perpendicular to the V2 direction.
As described above, the bypass flow path BP is preferably provided at a position away from the introduction flow path SPV in order to recover air bubbles in the ink. Since the supply-side vertical portion BP1VS is located in the region Re1, the bubbles accumulated in the region Re1 and the region Re2 in the supply-side common liquid chamber MN1 can be recovered. Further, since the supply side vertical portion BP1VS is located in the V1 direction more than the individual flow path RJ arranged in the most V2 direction, the ink flow toward the individual flow path RJ arranged in the most V2 direction is common to the supply side. It is possible to reduce the occurrence of ink stagnation at the end of the liquid chamber MN1 in the V2 direction.
Further, since the supply-side vertical portion BP2VS is located in the region Re2, bubbles staying in the region Re3 and the region Re4 in the supply-side common liquid chamber MN1 can be recovered. Further, since the supply side vertical portion BP2VS is located in the V2 direction more than the individual flow path RJ arranged in the most V1 direction, the ink flow toward the individual flow path RJ arranged in the most V1 direction is common to the supply side. It is possible to reduce the occurrence of ink stagnation at the end of the liquid chamber MN1 in the V1 direction.

Further, as illustrated in FIG. 10, the supply-side vertical portion BP1VS has the supply-side common liquid chamber MN1 in the region Re11, region Re12, region Re21, region Re22, region Re31, parallel to the plane perpendicular to the V2 direction. When it is evenly divided into eight regions, region Re32, region Re41, and region Re42, it is located in region Re11 which is most located in the V2 direction. The supply-side vertical portion BP2VS is located in the region Re42 most located in the V1 direction when the supply-side common liquid chamber MN1 is evenly divided into the above-mentioned eight regions in parallel with the plane perpendicular to the V2 direction.
Since the supply-side vertical portion BP1VS is located in the region Re11, the first bypass flow path BP1 can recover the bubbles accumulated in the region Re12 as compared with the embodiment in which the supply-side vertical portion BP1VS is located in the region Re12.
Further, since the supply-side vertical portion BP2VS is located in the region Re42, the first bypass flow path BP1 can recover the bubbles accumulated in the region Re41 as compared with the embodiment in which the supply-side vertical portion BP2VS is located in the region Re41. ..

The introduction flow path SPV may be slightly offset from the midpoint between the end in the V1 direction and the end in the V2 direction of the supply-side common liquid chamber MN1, and the lead-out flow path DSV is the discharge-side common liquid. The chamber MN2 may be slightly offset from the midpoint between the end in the V1 direction and the end in the V2 direction. For example, the introduction flow path SPV may be arranged in the region including the region R22 and the region R31 in FIG. The same applies to the lead flow path DSV.

Further, the liquid injection head 30 includes a lead-out flow path DSV that communicates with the discharge side common liquid chamber MN2 between the first bypass flow path BP1 and the second bypass flow path BP2 in the V2 direction. The first bypass flow path BP1 has a discharge side vertical portion BP1VD extending in the Z1 direction from the discharge side common liquid chamber MN2. The discharge side vertical portion BP1VD is an example of the "third vertical portion". The second bypass flow path BP2 has a discharge side vertical portion BP2VD extending in the Z1 direction from the discharge side common liquid chamber MN2. The discharge side vertical portion BP2VD is an example of the "fourth vertical portion". The discharge side vertical portion BP1VD is located in the V1 direction with respect to the individual flow path RJ arranged in the most V2 direction. The discharge side vertical portion BP2VD is located in the V2 direction with respect to the individual flow path RJ arranged in the most V1 direction. With reference to FIG. 21, the effect when the discharge side vertical portion BP1VD is located in the V1 direction with respect to the individual flow path RJ arranged in the V2 direction most will be described.

FIG. 21 is a diagram showing a discharge-side common liquid chamber MN2 when the nozzle surface FN is tilted in the present embodiment. The figure shown in FIG. 21 shows the end portion of the discharge side common liquid chamber MN2 in the V2 direction in a state where the nozzle surface FN is tilted by 60 degrees with respect to the horizontal plane SF in the present embodiment. In the example of FIG. 21, the V2 direction is a direction rotated 60 degrees counterclockwise with respect to the horizontal plane SF, and has a component in the direction opposite to the direction of gravity.

In the discharge side common liquid chamber MN2, air bubbles in the vicinity of the individual flow path RJ communicating with the nozzle N most arranged in the V2 direction flow in the V2 direction due to buoyancy. On the other hand, the ink flows as indicated by the arrow Ar4 shown in FIG. More specifically, the ink flowing along the Z2 direction in the discharge side vertical portion BP1VD and the ink flowing along the substantially V1 direction from the individual flow path RJ arranged in the most V2 direction merge. As described above, in the present embodiment, since the discharge side vertical portion BP1VD is located in the V1 direction with respect to the individual flow path RJ arranged in the most V2 direction, the ink from the individual flow path RJ arranged in the most V2 direction is formed. Flow in the V1 direction is generated. As described above, the bubbles in the discharge side common liquid chamber MN2 tend to flow in the V2 direction due to buoyancy, but since the flow of the bubbles in the V2 direction and the flow of the ink in the V1 direction face each other, they are common to the discharge side. It is possible to reduce the generation of air bubbles at the end of the liquid chamber MN2 in the V2 direction.

Further, the supply-side common liquid chamber MN1 has a V2 communication region MN1b located from the introduction flow path SPV to the supply-side vertical portion BP1VS and a V2 end region MN1a located in the V2 direction from the supply-side vertical portion BP1VS. Have. The V2 communication region MN1b is an example of the “first region”. The V2 end region MN1a is an example of a “second region”. The surface MN1aS in the Z1 direction of the V2 end region MN1a is arranged in the Z2 direction with respect to the surface MN1bS in the Z1 direction of the V2 communication region MN1b.
By arranging the surface MN1aS in the Z2 direction with respect to the surface MN1bS, the flow velocity of the ink in the V2 end region MN1a is the same as the position of the surface MN1aS of the V2 end region MN1a in the Z axis direction with the surface MN1bS. It is larger than the flow rate of the ink in the V2 end region MN1a in the embodiment. By increasing the flow velocity of the ink in the V2 end region MN1a, it is possible to reduce the occurrence of ink stagnation in the V2 end region MN1a.

Further, the V2 end region MN1a has a portion having a dimension less than half of the maximum dimension in the Z-axis direction of the V2 communication region MN1b. Generally, as the cross-sectional area of the flow path decreases, the flow rate of the liquid in the flow path increases. Therefore, the liquid injection head 30 can suppress a decrease in the flow velocity of the individual flow path RJ communicating with the V2 end region MN1a. Further, as the distance between the wall surface of the V2 end region MN1a in the Z1 direction and the wall surface of the V2 end region MN1a in the Z2 direction becomes closer, a space in which bubbles can stay is created in the Z1 direction of the V2 end region MN1a. It is possible to suppress the formation in the vicinity of the wall surface of the.

Further, the liquid injection device 100 includes a plurality of liquid injection heads 30. The plurality of liquid injection heads 30 form a long line head in the X-axis direction orthogonal to the Z1 direction. The V2 direction is a direction that intersects the X1 direction and the X2 direction. The X1 and X2 directions are examples of the "fifth direction". In addition, one liquid injection head 30 may form a long line head in the X-axis direction.

In other words, when the line head is placed on a surface inclined from the horizontal plane SF and used, in other words, when the nozzle surface FN is in a state of rotating about a straight line along the X-axis direction, FIGS. 19 and 19 and FIGS. As illustrated in 21, the retention of bubbles can be reduced.

Further, the liquid injection device 100 includes a liquid injection head 30. Further, the liquid injection device 100 includes a circulation mechanism 94 that circulates the ink supplied into the liquid injection head 30. By providing the circulation mechanism 94, air bubbles and settling ink mixed in the ink are returned to the sub tank together with the circulating ink, so that the occurrence of clogging of the nozzle N is reduced. Therefore, maintenance such as liquid replacement and cleaning of the liquid injection head 30 becomes easy.

Further, the liquid injection head 30 is configured by laminating a plurality of substrates in the Z2 direction. The plurality of substrates are, for example, the first flow path member Du1 and the second flow path member Du2 included in the flow path distribution unit 37, and the case 385 and the communication plate 382 included in the head unit 38. The liquid injection head 30 includes a plurality of individual flow paths RJ, a supply-side common liquid chamber MN1, a discharge-side common liquid chamber MN2, and a bypass flow path BP. The plurality of individual flow paths RJ communicate with each of the plurality of nozzles N for ejecting ink in the Z2 direction. The supply-side common liquid chamber MN1 extends in a direction intersecting the Z1 direction and communicates with a plurality of individual flow paths RJs to supply ink to the plurality of individual flow paths RJs. The direction intersecting the Z1 direction is typically the V1 direction, but it does not have to be the V1 direction as long as it intersects the Z1 direction. The discharge-side common liquid chamber MN2 extends in a direction intersecting the Z1 direction and communicates with a plurality of individual flow paths RJs, so that ink discharged from the plurality of individual flow paths RJs flows. The extending direction of the supply-side common liquid chamber MN1 and the extending direction of the discharge-side common liquid chamber MN2 may be the same or different. The plurality of individual flow paths RJs connect the supply-side common liquid chamber MN1 and the discharge-side common liquid chamber MN2. The supply-side common liquid chamber MN1 and the discharge-side common liquid chamber MN2 are formed in the same layer among a plurality of substrates. The same layer means that they are at the same position in the Z-axis direction. The same position in the Z-axis direction means that some or all of them overlap in the direction perpendicular to the Z-axis direction. For example, as illustrated in FIG. 8, the supply-side common liquid chamber MN1 and the discharge-side common liquid chamber MN2 overlap each other when viewed in the W-axis direction perpendicular to the Z-axis direction. The bypass flow path BP has a bypass horizontal portion BPH formed in a layer different from the supply side common liquid chamber MN1 and the discharge side common liquid chamber MN2 among the plurality of substrates. The bypass horizontal portion BPH is an example of the "first portion". Different layers mean different positions in the Z-axis direction. Different positions in the Z-axis direction mean that they do not overlap in the direction perpendicular to the Z-axis direction. For example, as illustrated in FIG. 10, the bypass horizontal portion BP1H and the bypass horizontal portion BP2H do not overlap with the supply side common liquid chamber MN1 when viewed in the W2 direction.

Bypass horizontal portion BPH is formed in a layer different from the supply side common liquid chamber MN1 and the discharge side common liquid chamber MN2, so that the bypass horizontal portion BPH is the supply side common liquid chamber MN1 and the discharge side common liquid in a plan view. It can be overlapped with a part of the chamber MN2. Therefore, in the first embodiment, the liquid injection head 30 is provided in the W-axis direction and the V-axis direction as compared with the embodiment in which the bypass horizontal portion BPH is in the same layer as the supply side common liquid chamber MN1 and the discharge side common liquid chamber MN2. Can be miniaturized.

Further, the first bypass flow path BP1 has a supply side vertical portion BP1VS and a discharge side vertical portion BP1VD. The second bypass flow path BP2 has a supply-side vertical portion BP2VS and a discharge-side vertical portion BP2VD. The supply-side vertical portion BP1VS and the supply-side vertical portion BP2VS are examples of the “second portion”. The discharge side vertical portion BP1VD and the discharge side vertical portion BP2VD are examples of the “third portion”. The supply-side vertical portion BP1VS and the supply-side vertical portion BP2VS connect the supply-side common liquid chamber MN1 and one end of the bypass horizontal portion BPH, and from the supply-side common liquid chamber MN1 in the Z1 direction opposite to the Z2 direction. It is postponed. The discharge-side vertical portion BP1VD and the discharge-side vertical portion BP2VD connect the discharge-side common liquid chamber MN2 and the other end of the bypass horizontal portion BPH, and extend from the discharge-side common liquid chamber MN2 in the Z1 direction.
The first bypass flow path BP1 has a supply-side vertical portion BP1VS and a discharge-side vertical portion BP1VD, so that the bypass horizontal portion BP1H is a supply-side common liquid chamber MN1 and a discharge-side common liquid chamber MN2 in a plan view. Can be overlapped with a part. Similarly, the second bypass flow path BP2 has a supply-side vertical portion BP2VS and a discharge-side vertical portion BP2VD, so that the bypass horizontal portion BP2H is a part of the supply-side common liquid chamber MN1 and discharge in a plan view. It can be overlapped with a part of the side common liquid chamber MN2.

It is provided with a supply flow path Si that supplies liquid to the supply side common liquid chamber MN1 and a discharge flow path Do through which the liquid discharged from the discharge side common liquid chamber MN2 flows, and is one of a bypass horizontal portion BPH and a supply flow path Si. The portion and a part of the discharge flow path Do are formed in the same layer among a plurality of substrates. More specifically, the bypass horizontal portion BPH, the distribution flow paths SPH1 and the distribution flow path SPH2 which are a part of the supply flow path Si, and the discharge horizontal flow paths DSH_1 to DSH_6 which are a part of the discharge flow path Do are described. Formed in the same layer.
The bypass horizontal portion BPH, the distribution flow path SPH1 and the distribution flow path SPH2, and the discharge horizontal flow paths DSH_1 to DSH_6 are formed in the same layer, whereby the bypass horizontal portion BPH, the distribution flow path SPH1 and the distribution flow path SPH2 are formed. And the discharge horizontal flow paths DSH_1 to DSH_1 can be formed by the same members, the first flow path member Du1 and the second flow path member Du2. Therefore, in the present embodiment, the bypass horizontal portion BPH, the distribution flow path SPH1 and the distribution flow path SPH2, any of the discharge horizontal flow paths DSH_1 to DSH_6, and any of the flow paths other than the flow path thereof. The number of parts of the liquid injection head 30 can be reduced as compared with the embodiment in which the remaining flow path is a different layer.

Further, the plurality of nozzles N form a nozzle row Ln by arranging them in the V2 direction orthogonal to the Z2 direction. The supply-side common liquid chamber MN1 and the discharge-side common liquid chamber MN2 extend in the V2 direction. The liquid injection head 30 includes a wiring member 388 arranged between the supply side common liquid chamber MN1 and the discharge side common liquid chamber MN2 in a plan view in the Z2 direction. As exemplified in FIG. 10, the wiring member 388 has a portion located in the V2 direction with respect to the nozzle N most arranged in the V2 direction among the plurality of nozzles N in a plan view. Further, as illustrated in FIG. 10, the wiring member 388 has a portion located in the V1 direction with respect to the nozzle N most arranged in the V1 direction among the plurality of nozzles N in a plan view. The bypass horizontal portion BP1H has a bent portion BP1Hb and a bent portion BP1Hd that are bent so as to bypass the wiring member 388. Similarly, the bypass horizontal portion BP2H has a bent portion BP2Hb and a bent portion BP2Hd that are bent so as to bypass the wiring member 388.
As described above, the wiring member 388 has a portion located in the V2 direction with respect to the nozzle N arranged in the most V2 direction among the plurality of nozzles N, and is in the most V1 direction among the plurality of nozzles N. It has a portion located in the V1 direction with respect to the arranged nozzle N. That is, the length of the wiring member 388 in the V-axis direction is longer than the length from the nozzle N arranged in the most V2 direction among the plurality of nozzles N to the nozzle N arranged in the most V1 direction. The reason why the length of the wiring member 388 in the V-axis direction is long is that the wiring member 388 has a wiring shared by all of the plurality of nozzles N in addition to the plurality of wirings corresponding to each of the plurality of nozzles N in the center. This is to have. Therefore, the first bypass flow path BP1 cannot connect the bypass port 3853a and the bypass port 3853b with the shortest straight line in a plan view. Similarly, the second bypass flow path BP2 cannot connect the bypass port 3853a and the bypass port 3853d with the shortest straight line in a plan view. However, in the present embodiment, the bypass horizontal portion BP1H has the bent portion BP1Hb and the bent portion BP1Hd, and the bypass horizontal portion BP2H has the bent portion BP2Hb and the bent portion BP2Hd. Since it is not necessary to shift the bypass horizontal portion BP2H in the Z-axis direction, the liquid injection head 30 can be miniaturized in the Z-axis direction.

Further, the plurality of substrates have a case 385 that defines a part of the supply side common liquid chamber MN1 and a part of the discharge side common liquid chamber MN2. A plurality of nozzles N communicating with the common liquid chamber MN1 on the supply side are arranged in the V2 direction orthogonal to the Z2 direction to form a nozzle row Ln. The supply-side common liquid chamber MN1 and the discharge-side common liquid chamber MN2 extend in the V2 direction. The bypass horizontal portion BP2H has a portion BP2H1 that does not overlap the case 385 in a plan view in the Z2 direction, as illustrated in FIGS. 10 and 16. On the other hand, the entire bypass horizontal portion BP1H overlaps with the case 385 in a plan view in the Z2 direction. As described above, the bypass horizontal portion BPH may completely overlap with the case 385 in a plan view, or may have a portion that does not overlap with the case 385. Since the entire bypass horizontal portion BP1H overlaps with the case 385 in a plan view seen in the Z-axis direction, the flow path distribution portion 37 can be miniaturized.

Further, the plurality of substrates have a plurality of cases 385 and a first flow path member Du1. Each of the plurality of cases 385 defines a part of the supply-side common liquid chamber MN1, a part of the discharge-side common liquid chamber MN2, and a part of the supply-side vertical portion BP1VS and the supply-side vertical portion BP2VS. The first flow path member Du1 is one of a plurality of bypass horizontal portions BPH corresponding to each of the plurality of cases 385, and a plurality of supply-side vertical portions BP1VS and supply-side vertical portions BP2VS corresponding to each of the plurality of cases 385. Define the part. The average flow path resistance per unit length of a portion of the supply-side vertical portion BP1VS defined by the first channel member Du1 is a portion of the supply-side vertical portion BP1VS defined by each of the plurality of cases 385. Greater than the average flow path resistance per unit length. Specifically, among the supply-side vertical portion BP1VS, the vertical portion BP1VSa defined by the first flow path member Du1 has the largest flow path resistance. Therefore, the designer of the liquid injection head 30 can accurately and accurately determine the flow path resistance of the first bypass flow path BP1 by simply replacing the first flow path member Du1 that defines the vertical portion BP1VSa having the largest flow path resistance. , Can be easily changed. The designer can change the ink pressure accurately and easily by changing the flow path resistance of the first bypass flow path BP1 accurately and easily.
The reason why the flow path resistance of the first bypass flow path BP1 can be easily changed is that when the first flow path member Du1 is formed by injection molding, the thickness of the pin which is the mold of the supply side vertical portion BP1VS is changed. This is because the cross-sectional area of the supply-side vertical portion BP1VS can be easily changed. Further, even when the supply-side vertical portion BP1VS is formed by drilling, the designer can easily change the cross-sectional area of the supply-side vertical portion BP1VS by changing the thickness of the drill bit used for drilling.
The reason why the flow path resistance of the first bypass flow path BP1 can be changed with high accuracy will be described. It is also possible to change the flow path resistance by changing the cross-sectional area of the bypass horizontal portion BP1H. However, when changing the flow path resistance of the bypass horizontal portion BP1H, the width in the V-axis direction, the width in the W-axis direction, and the width in the Z-axis direction of the bypass horizontal portion BP1H are affected by three factors, and the bypass horizontal portion is affected. It is difficult to accurately manufacture the flow path resistance of the BP1H so as to have the flow path resistance desired by the designer. On the other hand, the flow path resistance of the supply-side vertical portion BP1VS is only affected by the size of the pin used for injection molding or the size of the drill bit used for drilling. As described above, the flow path resistance of the supply-side vertical portion BP1VS can be changed with higher accuracy than the flow path resistance of the bypass horizontal portion BP1H.
As for the second bypass flow path BP2, the designer of the liquid injection head 30 can change the flow path resistance of the second bypass flow path BP2 with high accuracy and easily as in the case of the first bypass flow path BP1.
Further, in the first bypass flow path BP1, the average flow path resistance of the unit lengths of the supply side vertical portion BP1VS and the discharge side vertical portion BP1VD is larger than the average flow path resistance of the bypass horizontal portion BP1H. In general, the flow path resistance of the entire flow path largely depends on the portion where the flow path resistance is large. Therefore, by increasing the flow path resistance of the supply side vertical portion BP1VS and the discharge side vertical portion BP1VD whose flow path resistance can be changed accurately and easily, the flow path resistance of the first bypass flow path BP1 can be accurately changed. And it can be changed easily. Similar to the first bypass flow path BP1, the second bypass flow path BP2 also has the average flow path resistance of the unit lengths of the supply side vertical portion BP2VS and the discharge side vertical portion BP2VD, and the average flow path resistance is the average unit length of the bypass horizontal portion BP2H. Greater than the flow path resistance of.

Further, the length of the first flow path member Du1 in the supply-side vertical portion BP1VS and the supply-side vertical portion BP2VS in the Z1 direction is longer than the length in the Z1 direction of the case 385 in the supply-side vertical portion BP1VS and the supply-side vertical portion BP2VS. .. The length of the first flow path member Du1 in the supply-side vertical portion BP1VS and the supply-side vertical portion BP2VS in the Z1 direction is synonymous with the total length Ld of the vertical portion BP1VSa and the vertical portion BP1VSb in the Z1 direction. Further, the length of the case 385 in the supply-side vertical portion BP1VS and the supply-side vertical portion BP2VS in the Z1 direction is synonymous with the length Lc of the vertical portion BP2VSc in the Z1 direction.
Since the length Ld is longer than the length Lc, the length of the head unit 38 in the Z-axis direction can be shortened as compared with the embodiment in which the length Ld is shorter than the length Lc. Further, in the present embodiment, the maximum value of the flow path resistance of the bypass flow path BP formed in the first flow path member Du1 can be increased as compared with the embodiment in which the length Ld is shorter than the length Lc. That is, in the present embodiment, the changeable range of the flow path resistance of the bypass flow path BP can be increased as compared with the embodiment in which the length Ld is shorter than the length Lc.

The plurality of substrates has a plurality of cases 385, a first flow path member Du1 and a second flow path member Du2. Each of the plurality of cases 385 defines a part of the supply side common liquid chamber MN1, a part of the discharge side common liquid chamber MN2, and a part of the bypass flow path BP. The first flow path member Du1 is laminated in the Z1 direction, which is the direction opposite to the Z2 direction, with respect to the plurality of cases 385. The second flow path member Du2 is laminated in the Z1 direction with respect to the first flow path member Du1. The liquid injection head 30 includes a distribution flow path SPH1 and a distribution flow path SPH2. The distribution flow path SPH1 and the distribution flow path SPH2 distribute and supply ink to a plurality of supply-side common liquid chambers MN1 defined by each of the plurality of cases 385. As illustrated in FIG. 17, the plurality of bypass horizontal portions BP1H and bypass horizontal portions BP2H corresponding to each of the plurality of cases 385, and the distribution flow path SPH1 and the distribution flow path SPH1 are the first flow path member Du1 and the first. It is formed between the two flow path members Du2. The bypass horizontal portion BP1H and the bypass horizontal portion BP2H corresponding to the case 385 are the bypass horizontal portion BP1H and the bypass horizontal portion BP2H included in the bypass flow path BP communicating with the bypass port 3853 of the case 385.
According to the present embodiment, the bypass horizontal portion BP1H, the bypass horizontal portion BP2H, the distribution flow path SPH1, and the distribution flow path SPH2 can be configured by the same member, so that the bypass horizontal portion BP1H, the bypass horizontal portion BP2H, and the distribution flow path SPH1 The number of parts of the liquid injection head 30 can be reduced as compared with the embodiment in which any of the flow paths of the distribution flow path SPH2 is formed other than between the first flow path member Du1 and the second flow path member Du2.

2. 2. 2nd Embodiment As illustrated in FIG. 1, the liquid injection device 100 in the 1st embodiment is a so-called line type liquid injection device in which a head module 3 is fixed and printing is performed only by transporting a medium PP. However, the configuration of the liquid injection device is not limited to that described above. In the liquid injection device 100A according to the second embodiment, one or a plurality of liquid injection heads 30 are mounted on the carriage 911, and the one or a plurality of liquid injection heads 30 are reciprocated along the X-axis direction. It is a so-called serial type liquid injection device that conveys the medium PP and performs printing. Hereinafter, the second embodiment will be described.

FIG. 22 is an explanatory diagram showing an example of the liquid injection device 100A according to the second embodiment. The liquid injection device 100A is different from the liquid injection device 100 in that the control device 90A is provided instead of the control device 90, the head module 3A is provided instead of the head module 3, and the moving mechanism 91 is provided.

The moving mechanism 91 reciprocates the liquid injection head 30 in the X1 direction and the X2 direction under the control of the control device 90A. In the example shown in FIG. 22, the moving mechanism 91 has a box-shaped carriage 911 that holds two liquid injection heads 30, and a transport belt 912 to which the carriage 911 is fixed. The transport belt 912 reciprocates the carriage 911 in the X1 direction and the X2 direction by a driving force from a driving source (not shown).

As described above, the liquid injection device 100A in the second embodiment includes the liquid injection head 30 and the moving mechanism 91. The moving mechanism 91 holds the liquid injection head 30 and reciprocates in the X1 direction and the X2 direction orthogonal to the Z2 direction.
When the liquid injection head 30 is used tilted with respect to the horizontal plane SF, in other words, when the nozzle surface FN is in a state of rotating about a straight line along the X-axis direction with respect to the horizontal plane SF, Since the V-axis direction intersects the X-axis direction, the occurrence of ink stagnation can be reduced as in the first embodiment.

3. 3. Third Embodiment The liquid injection device 100B according to the third embodiment has a configuration in which four head modules 3 are arranged around a drum 921 that rotationally conveys the medium PP. Hereinafter, the third embodiment will be described.

FIG. 23 is a schematic view of the liquid injection device 100B according to the third embodiment. The liquid injection device 100B is the same as the liquid injection device 100 except that it has a transfer mechanism 92B instead of the transfer mechanism 92 and has a plurality of head modules 3. In FIG. 23, the control device 90, the circulation mechanism 94, and the like are not shown.

In FIG. 23, in addition to the XYZ coordinate system used in FIG. 1 and the like, an xyz coordinate system different from the XYZ coordinate system will be used for description. The xyz coordinate system is a global coordinate system. The xyz coordinate system is defined by the x1 direction, the y1 direction, and the z2 direction. The x1 direction is an arbitrary direction parallel to the horizontal plane SF. The y1 direction is parallel to the horizontal plane SF and orthogonal to the x1 direction. The z2 direction is the direction of gravity. Further, in the following description, the direction opposite to the x1 direction is referred to as the x2 direction. Further, the x1 direction and the x2 direction are collectively referred to as the x-axis direction. The direction opposite to the y1 direction is referred to as the y2 direction. The y1 direction and the y2 direction are collectively referred to as the y-axis direction. The direction opposite to the z2 direction is referred to as the z1 direction. The z1 direction and the z2 direction are collectively referred to as the z-axis direction. The figure shown in FIG. 23 is a view of the liquid injection device 100B in the x2 direction. The XYZ coordinate system in the third embodiment exists for each head module 3.

As illustrated in FIG. 23, the transport mechanism 92B has a drum 921 that transports the medium PP in a state of being attracted to the outer peripheral surface, and a drive mechanism 922 such as a motor. The drum 921 is a cylindrical or columnar member having an outer peripheral surface along the central axis Ax parallel to the x-axis direction. The drum 921 is rotationally driven around the central axis Ax by the drive mechanism 922. The outer peripheral surface of the drum 921 is charged by a charger (not shown). Due to the electrostatic force generated by this charging, the medium PP is electrostatically adsorbed on the outer peripheral surface of the drum 921.

The configuration of the transport mechanism 92B is not limited to the example shown in FIG. 23, and for example, a belt may be used instead of the drum 921, or air suction or the like may be used instead of electrostatic suction. Further, the transport mechanism 92B may have a component such as a static eliminator in addition to the above-mentioned components.

Head modules 3_1, 3_2, 3_3 and 3_4 face each other on the outer peripheral surface of the drum 921. Each of the head modules 3_1, 3_2, 3_3 and 3_4 is configured in the same manner as the head module 3 of the first embodiment.

However, in the head modules 3_1, 3_2, 3_3 and 3_4, the postures around the axes parallel to the x-axis direction are different from each other. Further, the type of ink used for the head modules 3_1, 3_2, 3_3 and 3_4 may be different for each head module 3. For example, when the colors of the inks used for the head modules 3_1, 3_2, 3_3 and 3_4 are different for each head module 3, four inks of yellow, magenta, cyan and black are used.

Specifically, the head modules 3_1, 3_2, 3_3 and 3_4 are arranged in this order along the outer peripheral surface of the drum 921 along the circumferential direction CD of the central axis Ax. Further, each of the head modules 3_1, 3_2, 3_3 and 3_4 is arranged at a position rotated around a rotation axis extending in the X1 direction which is the longitudinal direction of the head module 3, so that the nozzle surface FN is arranged. It is orthogonal to the radial direction RD of the central axis Ax of the drum 921 and is inclined with respect to the horizontal plane SF.
However, in the example of FIG. 23, the nozzle surface FNs of the head modules 3_1, 3_2, 3_3 and 3_4 are inclined with respect to the horizontal plane SF, but may be parallel to the horizontal plane SF. When the nozzle surface FN is parallel to the horizontal plane SF, the Y-axis direction of the head module 3 having the nozzle surface FN is parallel to the y-axis direction, and the Z-axis direction of the head module 3 is the z-axis direction. Is parallel to.

The X-axis directions of the head modules 3_1, 3_2, 3_3, and 3_4 are parallel to the x-axis direction. Therefore, the head modules 3_1, 3_2, 3_3, and 3_4 are long line heads in the x-axis direction.

The positional relationship of the head module 3 will be described. The head module 3_4 is arranged in the y1 direction orthogonal to the x-axis direction with respect to the head module 3_1 in a plan view seen in the z-axis direction. Similarly, the head module 3_3 is arranged in the y1 direction with respect to the head module 3_2 in a plan view seen in the z-axis direction.
The head module 3_1 and the head module 3_2 are examples of the “first line head”. When the head module 3_1 corresponds to the "first line head", the head module 3_1 corresponds to the "second line head". When the head module 3_2 corresponds to the "first line head", the head module 3_3 corresponds to the "second line head". In the third embodiment, the x1 direction and the x2 direction are examples of the "fifth direction". The y1 direction is an example of the "sixth direction". However, when the nozzle surface FN is parallel to the horizontal plane SF, the Y1 direction and the y1 direction of the head module 3 having the nozzle surface FN are the same.

In the head module 3_1, the end portion of the nozzle surface FN of the head module 3_1 in the y1 direction is located in the z1 direction with respect to the end portion of the nozzle surface FN of the head module 3_1 in the y2 direction opposite to the y1 direction. It is arranged at an angle. Similarly, in the head module 3_2, the end of the nozzle surface FN of the head module 3_2 in the y1 direction is in the z1 direction with respect to the end of the nozzle surface FN of the head module 3_2 in the y2 direction opposite to the y1 direction. Arranged at an angle so that it is located.
When the head module 3_1 corresponds to the "first line head", the nozzle surface FN of the head module 3_1 corresponds to the "first nozzle surface". When the head module 3_2 corresponds to the "first line head", the nozzle surface FN of the head module 3_2 corresponds to the "first nozzle surface". The y2 direction is an example of the "seventh direction".

The head module 3_3 is arranged so as to be inclined so that the end portion of the nozzle surface FN of the head module 3_3 in the y1 direction is located in the z2 direction with respect to the end portion of the nozzle surface FN of the head module 3_3 in the y2 direction. .. Similarly, the head module 3_4 is inclined so that the end portion of the nozzle surface FN of the head module 3_4 in the y1 direction is located in the z2 direction with respect to the end portion of the nozzle surface FN of the head module 3_4 in the y2 direction. Be placed.

Further, the inclination angle θ1 of the nozzle surface FN of the head module 3_1 with respect to the horizontal plane SF is equal to the inclination angle θ4 of the nozzle surface FN of the head module 3_1 with respect to the horizontal plane SF. Similarly, the tilt angle θ2 of the nozzle surface FN of the head module 3_2 with respect to the horizontal plane SF is equal to the tilt angle θ3 of the nozzle surface FN of the head module 3_3 with respect to the horizontal plane SF. However, the inclination angles θ2 and θ3 are smaller than the above-mentioned inclination angles θ1 or θ4, respectively.

In the above third embodiment, the liquid injection head 30 in the head modules 3_1, 3_2, 3_3, and 3_4 includes a nozzle surface FN having a plurality of nozzles N, and the nozzle surface FN is an axis along the x-axis direction. It is orthogonal to the radial RD and is inclined with respect to the horizontal plane SF. Further, the x-axis direction is a direction that intersects the V-axis direction. According to the third embodiment, as in the first embodiment, it is possible to suppress the generation of ink stagnation at the ends of the supply-side common liquid chamber MN1 and the discharge-side common liquid chamber MN2 in the direction opposite to the gravity direction, and it is possible to suppress the generation of ink stagnation. The stagnation can be reduced.

A head module arranged so that the V1 direction contains a component in the z1 direction and a head module arranged so as to include a component in the z1 direction, such as the head module 3_2 and the head module 3_3, and the head module 3_1 and the head module 3_1, are arranged so as to include the component in the z1 direction. Even in the liquid injection device including the head module, since the bypass flow path BP is provided near the ends in both the V1 direction and the V2 direction, the air exhaustability can be improved. A liquid injection device including a head module arranged so that the V1 direction contains a component in the z1 direction and a head module arranged so that the V2 direction contains a component in the z1 direction has a rotation direction opposite to that of the central axis Ax. It can be said that it includes a plurality of head modules.
In the above description, the head module 3_1 and the head module 3_2 are described as an example of the "first line head", but the head module 3_3 and the head module 3_4 may be an example of the "first line head". .. When the head module 3_3 corresponds to the "first line head", the head module 3_2 corresponds to the "second line head". On the other hand, when the head module 3_1 corresponds to the "first line head", the head module 3_1 corresponds to the "second line head". The "sixth direction" corresponds to the y2 direction, and the "seventh direction" corresponds to the y1 direction.

Further, as described above, the tilt angle θ1 is equal to the tilt angle θ4. Therefore, the location where bubbles are generated in the head module 3_1 and the location where bubbles are generated in the head module 3_1 are line-symmetrical with the xz plane passing through the central axis Ax as the axis of symmetry, as compared with the embodiment in which the inclination angle θ1 is different from the inclination angle θ4. It is likely to be close to. Therefore, the operating conditions for discharging air bubbles, in other words, the operating time for maintenance, can be set to be the same for the head module 3_1 and the head module 3_1. More specifically, the time for performing maintenance for discharging air bubbles in the head module 3_1 and the time for performing maintenance for discharging air bubbles in the head module 3_1 can be set at the same time. Therefore, according to the third embodiment, it is possible to simplify the setting of maintenance for discharging air bubbles.

4. Modification example The above-exemplified morphology can be variously modified. Specific embodiments that may be applied to the above-described embodiments are illustrated below. Two or more embodiments arbitrarily selected from the following examples can be appropriately merged to the extent that they do not contradict each other.

4.1. First Modification Example The bypass horizontal portion BPH in each of the above-described embodiments is bent so as to bypass the wiring member 388, but the length of the wiring member 388 in the V-axis direction is changed from the supply side vertical portion BP1VS to the supply side vertical portion BP2VS. If it is shorter than the length up to, the bypass horizontal portion BPH does not have to bend.

FIG. 24 is a plan view of the head unit 38D in the first modification as viewed in the Z2 direction. The figure shown in FIG. 24 shows the positional relationship between the first bypass flow path BP1D in the first modification, the second bypass flow path BP2D in the first modification, and the wiring member 388D in the first modification. The member 388D is shown by a alternate long and short dash line.

As illustrated in FIG. 24, the first bypass flow path BP1D has a supply side vertical portion BP1VS, a bypass horizontal portion BP1HD, and a discharge side vertical portion BP1VD. As illustrated in FIG. 24, in the V-axis direction, the end portion of the wiring member 388D in the V2 direction is in the V1 direction from the end portion of the supply side vertical portion BP1VS in the V1 direction and the end portion of the discharge side vertical portion BP1VD in the V1 direction. Located in. Therefore, the bypass horizontal portion BP1HD does not have to have a bent portion. The bypass horizontal portion BP1HD extends in the W-axis direction, communicates with the supply-side vertical portion BP1VS at the end in the W1 direction, and communicates with the discharge-side vertical portion BP1VD at the end in the W2 direction.

As illustrated in FIG. 24, the second bypass flow path BP2D has a supply side vertical portion BP2VS, a bypass horizontal portion BP2HD, and a discharge side vertical portion BP2VD. As illustrated in FIG. 24, in the V-axis direction, the end portion of the wiring member 388D in the V1 direction is in the V2 direction from the end portion of the supply side vertical portion BP2VS in the V2 direction and the end portion of the discharge side vertical portion BP2VD in the V2 direction. Located in. Therefore, the bypass horizontal portion BP2HD does not have to have a bent portion. The bypass horizontal portion BP2HD extends in the W-axis direction, communicates with the supply-side vertical portion BP2VS at the end in the W1 direction, and communicates with the discharge-side vertical portion BP2VD at the end in the W2 direction.

4.2. Second Modification Example The supply flow path Si in each of the above embodiments includes a distribution flow path SPH1 and a distribution flow path SPH2 which are the same layer as the bypass horizontal portion BPH, and the discharge flow path Do is the same layer as the bypass horizontal portion BPH. Includes, but is not limited to, certain discharge horizontal channels DSH_1 to DSH_1. For example, one of the supply flow path Si and the discharge flow path Do does not have to have a flow path that is in the same layer as the bypass horizontal portion BPH. In other words, the bypass horizontal portion BPH and a part of the supply flow path Si and a part of the discharge flow path Do may be formed in the same layer. Specifically, there are the following two aspects. In the first aspect, the supply flow path Si includes the distribution flow path SPH1 and the distribution flow path SPH2, and the discharge flow path Do is along the VW plane between the first flow path member Du1 and the second flow path member Du2. It is an embodiment that does not have a flow path. In the second aspect, the supply flow path Si does not have a flow path along the VW plane between the first flow path member Du1 and the second flow path member Du2, and the discharge flow path Do is a discharge horizontal flow path. It is an embodiment having DSH_1 to DSH_1.

According to the second modification, as compared with the embodiment in which the supply flow path Si and the discharge flow path Do do not have a flow path along the VW plane between the first flow path member Du1 and the second flow path member Du2. Since the bypass horizontal portion BPH and one of a part of the supply flow path Si and a part of the discharge flow path Do can be made of the same member, the number of parts of the liquid injection head 30 can be reduced.

4.3. Third Modified Example In the first embodiment, the second embodiment, the third embodiment, and the first modified example described above, the distribution flow paths SPH1 and SPH2 are formed in the flow path distribution unit 37, and the flow path structure is formed. The discharge merging flow paths DUo1 and DUo2 are formed in the body 34, but the present invention is not limited to this. The liquid injection head 30 according to the third modification has a distribution flow path in which ink is distributed and supplied to a plurality of supply-side common liquid chambers MN1 in the flow path structure 34, and is contained in the flow path distribution unit 37. , It has a merging flow path for merging ink discharged from a plurality of common liquid chambers MN2 on the discharging side.

That is, in the liquid injection head 30 in the third modification, the plurality of substrates have a plurality of cases 385, a first flow path member Du1 and a second flow path member Du2. Each of the plurality of cases 385 defines a part of the supply side common liquid chamber MN1, a part of the discharge side common liquid chamber MN2, and a part of the bypass flow path BP. The first flow path member Du1 is laminated on a plurality of cases 385 in a direction opposite to the Z1 direction. The second flow path member Du2 is laminated in the direction opposite to the Z1 direction with respect to the first flow path member Du1. The liquid injection head 30 includes a merging flow path for merging the liquid discharged from the plurality of discharge-side common liquid chambers MN2 defined by each of the plurality of cases 385. A plurality of first portions corresponding to each of the plurality of cases 385 and a merging flow path are formed between the first flow path member Du1 and the second flow path member Du2.
According to the third modification, since the bypass horizontal portion BPH and the above-mentioned merging flow path can be configured by the same member, the above-mentioned merging flow path is the first flow path member Du1 and the second flow path member Du2. The number of parts of the liquid injection head 30 can be reduced as compared with the embodiment formed other than between.

The effect of the first embodiment due to the difference between the first embodiment and the third modification will be described. In general, when the flow paths merge, the flow velocity increases and the pressure loss tends to increase. Further, considering the influence of the pressure on the nozzle N, there is a situation that the pressure loss should be reduced in the discharge flow path Do rather than the supply flow path Si. Therefore, in the first embodiment, as compared with the third modification in which the ink is distributed to the flow path structure 34 in the supply flow path Si, the portion where the ink joins becomes longer, so that the flow velocity becomes larger and the bubbles are generated. Emission can be improved. Further, in the first embodiment, as compared with the third modification in which the discharge flow path Do has a merging flow path for merging ink with the flow path distribution portion 37, the portion where the ink merges is shorter, so that the resistance of the flow path is short. Is reduced, and the pressure fluctuation of the nozzle N can be reduced.

4.4. Fourth Modification Example In each of the above-described embodiments, the case 385 defines a part of the supply-side common liquid chamber MN1 and a part of the discharge-side common liquid chamber MN2, but defines the entire supply-side common liquid chamber MN1. Alternatively, the entire discharge side common liquid chamber MN2 may be defined.

4.5. Fifth Modification Example In each of the above-described embodiments, the supply-side vertical portion BP1VS is located in the V1 direction with respect to the individual flow path RJ arranged in the most V2 direction. The supply-side vertical portion BP2VS is located in the V2 direction with respect to the individual flow path RJ arranged most in the V1 direction, but is not limited to this. For example, the supply-side vertical portion BP1VS is located in the V2 direction from the individual flow path RJ arranged in the most V2 direction, and the supply-side vertical portion BP2VS is located in the V1 direction from the individual flow path RJ arranged in the most V1 direction. May be located in. For example, in the first embodiment shown in FIG. 18, the supply-side vertical portion BP1VS is located in the V2 direction with respect to the individual flow path RJ arranged in the most V2 direction.

Also in the fifth modification, the bypass horizontal portion BPH is formed in a layer different from the supply side common liquid chamber MN1 and the discharge side common liquid chamber MN2, so that the bypass horizontal portion BPH is the supply side common liquid in a plan view. It can be overlapped with a part of the chamber MN1 and the discharge side common liquid chamber MN2. Therefore, in the fifth modification as well, the liquid injection head 30 can be miniaturized in the W-axis direction and the V-axis direction as in the first embodiment.

4.6. Sixth Modification Example In each of the above embodiments, the liquid injection head 30 is a heat generating element instead of the piezoelectric element used in each of the above embodiments as an energy generating element for generating energy in the pressure chamber CB for injecting ink. May have.

4.7. Other Modifications The liquid injection device 100 described above can be used in various devices such as a facsimile machine and a copier, in addition to a device dedicated to printing. However, the application of the liquid injection device 100 of the present invention is not limited to printing. For example, a liquid injection device that injects a solution of a coloring material is used as a manufacturing device for forming a color filter of a liquid crystal display device. Further, a liquid injection device for injecting a solution of a conductive material is used as a manufacturing device for forming wiring and electrodes on a wiring board.

5. Addendum For example, the following configuration can be grasped from the above-exemplified forms.

The liquid injection head according to the first aspect, which is a preferred embodiment, includes a nozzle array in which a plurality of nozzles for injecting a liquid in a first direction are arranged side by side in a second direction orthogonal to the first direction, and the plurality of nozzles. A plurality of individual flow paths communicating with each of the above, a supply-side common liquid chamber extending in the second direction and communicating with the plurality of individual flow paths to supply liquid to the plurality of individual flow paths, and the above. A common liquid chamber on the discharge side, a common liquid chamber on the supply side, and a common liquid chamber on the discharge side, which extend in the second direction and communicate with the plurality of individual flow paths and allow the liquid discharged from the plurality of individual flow paths to flow. A first bypass flow path connecting the liquid chamber, a second bypass flow path connecting the supply side common liquid chamber and the discharge side common liquid chamber, and the first bypass flow in the second direction. An introduction flow path communicating with the supply-side common liquid chamber is provided between the path and the second bypass flow path, and the first bypass flow path is from the supply-side common liquid chamber to the first direction. Has a first vertical portion extending in the third direction, which is the opposite direction, and the second bypass flow path has a second vertical portion extending in the third direction from the common liquid chamber on the supply side. The first vertical portion is located in the fourth direction opposite to the second direction from the individual flow path arranged in the second direction, and the second vertical portion is the fourth. It is located in the second direction with respect to the individual flow path arranged in the direction.
According to the first aspect, as a result of the nozzle surface being arranged at an angle with respect to the horizontal plane, even if the second direction has a component in the direction opposite to the direction of gravity, the individual arranged in the second direction is the most. Since the flow of the liquid to the flow path is generated, the generation of stagnation of the liquid at the end of the common liquid chamber on the supply side in the second direction can be suppressed, and the retention of air bubbles can be reduced. Similarly, as a result of the nozzle surface being arranged at an angle with respect to the horizontal plane, even if the fourth direction has a component in the direction opposite to the gravity direction, the individual flow path arranged in the fourth direction is reached. Since the flow of the liquid is generated, the generation of stagnation of the liquid at the end of the common liquid chamber on the supply side in the fourth direction can be suppressed, and the retention of air bubbles can be reduced.

In the second aspect, which is a specific example of the first aspect, the first vertical portion is most described when the supply-side common liquid chamber is evenly divided into four regions in parallel with the plane perpendicular to the second direction. Located in a region located in the second direction, the second vertical portion is most when the supply-side common liquid chamber is evenly divided into the four regions parallel to the plane perpendicular to the second direction. It is located in the region located in the fourth direction.
According to the second aspect, since the first vertical portion is located in the region located in the secondmost direction when the supply side common liquid chamber is evenly divided into four regions, the introduction flow path in the supply side common liquid chamber. Bubbles that have accumulated from the portion communicating with the first vertical portion to the first vertical portion can be recovered. Similarly, since the second vertical portion is located in the region located in the fourthmost direction when the supply-side common liquid chamber is evenly divided into four regions, it communicates with the introduction flow path in the supply-side common liquid chamber. Bubbles accumulated from the portion to the second vertical portion can be recovered.

In the third aspect, which is a specific example of the second aspect, the first vertical portion is most described when the supply-side common liquid chamber is evenly divided into eight regions in parallel with the plane perpendicular to the second direction. Located in a region located in the second direction, the second vertical portion is most when the supply-side common liquid chamber is evenly divided into the eight regions parallel to the plane perpendicular to the second direction. It is located in the region located in the fourth direction.
According to the third aspect, the first vertical portion is located in the region located in the secondmost direction when the common liquid chamber on the supply side is evenly divided into eight regions, so that the first vertical portion is located in the region located in the secondmost direction, as compared with the second embodiment. More bubbles can be recovered from the portion communicating with the introduction flow path to the first vertical portion in the common liquid chamber on the supply side. Similarly, the second vertical portion is located in the region located in the fourthmost direction when the common liquid chamber on the supply side is evenly divided into eight regions, so that the common liquid chamber on the supply side is common as compared with the second embodiment. More bubbles can be recovered from the portion communicating with the introduction flow path in the liquid chamber to the second vertical portion.

In the fourth aspect, which is a specific example of any one of the first to third aspects, the discharge-side common liquid chamber is connected between the first bypass flow path and the second bypass flow path in the second direction. The first bypass flow path has a third vertical portion extending in the third direction from the discharge side common liquid chamber, and the second bypass flow path has the discharge side. It has a fourth vertical portion extending in the third direction from the common liquid chamber, and the third vertical portion is located in the fourth direction with respect to the individual flow path arranged in the second direction most. The fourth vertical portion is located in the second direction with respect to the individual flow path arranged in the fourth direction.
According to the fourth aspect, as a result of the nozzle surface being arranged so as to be inclined with respect to the horizontal plane, even if the second direction has a component in the direction opposite to the gravity direction, the bubble flows in the second direction. Since the flow of the liquid in the fourth direction is opposite to that of the liquid, the generation of stagnation of the liquid at the end of the common liquid chamber on the discharge side in the second direction can be suppressed, and the retention of bubbles can be reduced. Similarly, as a result of the nozzle surface being tilted with respect to the horizontal plane, even if the fourth direction has a component in the direction opposite to the direction of gravity, the flow of bubbles flowing in the fourth direction and the liquid Since the flow in the second direction is opposite to each other, the generation of liquid stagnation at the end of the common liquid chamber on the discharge side in the fourth direction can be suppressed, and the retention of air bubbles can be reduced.

In aspect 5, which is a specific example of any one of aspects 1 to 4, the supply-side common liquid chamber has a first region located from the introduction flow path to the first vertical portion and the first region. It has a second region located in the second direction with respect to the vertical portion, and the surface of the second region in the third direction is the third region with respect to the surface of the first region in the third direction. Arranged in one direction.
According to the fifth aspect, the flow velocity of the liquid in the second region is within the second region in the embodiment in which the position of the third direction surface of the second region is the same as the position of the third direction surface of the first region. It becomes larger than the flow velocity of the liquid. By increasing the flow velocity of the liquid, the occurrence of stagnation of the liquid can be reduced.

In the sixth aspect, which is a specific example of the fifth aspect, the second region has a portion having a dimension in the first direction, which is less than half of the maximum dimension of the first region in the first direction.
Generally, as the cross-sectional area of the fluid decreases, the flow velocity of the fluid increases. Therefore, according to the sixth aspect, it is possible to suppress a decrease in the flow velocity of the individual flow path communicating with the second region.

The liquid injection device according to the seventh aspect, which is a preferred embodiment, holds the liquid injection head according to any one of aspects 1 to 6 and the liquid injection head, and has a fifth direction orthogonal to the first direction. A moving mechanism for reciprocating the liquid injection head in a direction opposite to the fifth direction is provided, and the second direction is a direction intersecting with the fifth direction.
According to the seventh aspect, it is possible to provide a serial type liquid injection device capable of reducing the occurrence of stagnation of the liquid.

The liquid injection device according to the eighth aspect, which is a preferred embodiment, includes the liquid injection head according to any one of aspects 1 to 6, wherein the liquid injection head is oriented in a fifth direction orthogonal to the first direction. A long line head is formed, and the second direction is a direction intersecting with the fifth direction.
According to the eighth aspect, it is possible to provide a line-type liquid injection device capable of reducing the occurrence of stagnation of the liquid.

In aspect 9, which is a specific example of aspect 7 or 8, the liquid injection head comprises a nozzle surface having the plurality of nozzles, and the nozzle surface is orthogonal to the radial direction of an axis along the fifth direction. And, it is inclined with respect to the horizontal plane.
According to the ninth aspect, the generation of stagnation of the liquid at the ends of the common liquid chamber on the supply side and the common liquid chamber on the discharge side in the direction opposite to the gravity direction can be suppressed, and the retention of air bubbles can be reduced.

The liquid injection device according to the tenth aspect, which is a preferred embodiment, is composed of the liquid injection head according to any one of aspects 1 to 6, and is long in the fifth direction orthogonal to the first direction. A second line head composed of a line head and the liquid injection head according to any one of aspects 1 to 6, which is elongated in the fifth direction, and is the fifth direction when viewed in the direction of gravity. A second line head arranged in a sixth direction orthogonal to the above, and a transport mechanism for transporting the medium are provided, and the first line head is the sixth direction of the first nozzle surface of the first line head. The end portion is inclined and arranged so as to be positioned in the direction opposite to the gravity direction with respect to the end portion of the first nozzle surface in the seventh direction opposite to the sixth direction. The two-line head is provided so that the end of the second nozzle surface of the second line head in the sixth direction is located in the gravity direction with respect to the end of the second nozzle surface in the seventh direction. Arranged at an angle.
According to the tenth aspect, the first line head and the second line head have different inclination angles, but the retention of air bubbles can be reduced for both the first line head and the second line head. Elimination can be improved.

In the eleventh aspect, which is a specific example of the tenth aspect, the inclination angle of the first nozzle surface with respect to the horizontal plane is equal to the inclination angle of the second nozzle surface with respect to the horizontal plane.
According to the eleventh aspect, since the operating conditions for discharging the bubbles can be set to be the same for the first line head and the second line head, it is time to perform the maintenance for discharging the bubbles in the first line head. And the time for performing maintenance for discharging air bubbles in the second line head can be set at the same time. Therefore, according to the eleventh aspect, it is possible to simplify the maintenance schedule setting for discharging the bubbles.

The liquid injection device according to the 12th aspect, which is a preferred embodiment, includes the liquid injection head according to any one of the 1st to 6th aspects.
According to the twelfth aspect, it is possible to provide a liquid injection device capable of suppressing the retention of bubbles.

In aspect 13, which is a specific example of any one of aspects 7 to 12, a circulation mechanism for circulating the liquid supplied into the liquid injection head is provided.
According to the thirteenth aspect, the bubbles and dust mixed in the liquid are returned to the circulation mechanism together with the circulating liquid, so that the occurrence of nozzle clogging is reduced. Therefore, maintenance of liquid replacement and cleaning of the liquid injection head becomes easy.

3,3A ... head module, 13 ... head fixing board, 15 ... mounting hole, 30 ... liquid injection head, 31 ... housing, 32 ... cover board, 33 ... collective board, 34 ... flow path structure, 35 ... wiring board , 37 ... Flow distribution unit, 38, 38D ... Head unit, 39 ... Fixed plate, 90 ... Control device, 91 ... Movement mechanism, 92, 92B ... Conveyance mechanism, 93 ... Liquid container, 94 ... Circulation mechanism, 100, 100A , 100B ... Liquid injection device, 382 ... Communication plate, 383 ... Pressure chamber substrate, 384 ... Vibration plate, 385 ... Case, 387 ... Nozzle plate, 388,388D ... Wiring member, 921 ... Drum, 922 ... Drive mechanism, 3851 ... Introductory port, 3852 ... Outlet port, 3853 ... Bypass port, 3861 ... Compliance board, Ax ... Central axis, BP ... Bypass flow path, BP1, BP1D ... First bypass flow path, BPH, BP1H, BP1HD, BP2H, BP2HD ... Bypass Horizontal part, BP1VD, BP2VD ... Discharge side vertical part, BP1VS, BP2VS ... Supply side vertical part, BP2 ... Bypass flow path, BP2, BP2D ... Second bypass flow path, BP2H1 ... Part, CB ... Pressure chamber, CI1, CI2 ... Introductory port, DSH ... Discharge horizontal flow path, DSV ... Derivation flow path, Do ... Discharge flow path, FN ... Nozzle surface, Ln ... Nozzle row, MN1 ... Supply side common liquid chamber, MN1a ... V2 end region, MN1aC ... Disconnection Area, MN1aS ... surface, MN1b ... V2 communication region, MN1bC ... cross-sectional area, MN1bS ... surface, MN2 ... discharge side common liquid chamber, N ... nozzle, PP ... medium, PZ ... piezoelectric element, RJ ... individual flow path, SCi1, SCi2 ... Supply common flow path, SDi1, SDi2 ... Supply distribution flow path, SF ... Horizontal plane, SPH1, SPH2 ... Distribution flow path, SPV ... Introduction flow path, Si ... Supply flow path, Si1, Si2 ... First supply flow path, θ1, θ2, θ3, θ4 ... Tilt angle.

Claims (13)

A nozzle array composed of a plurality of nozzles for ejecting a liquid in the first direction arranged side by side in a second direction orthogonal to the first direction.
A plurality of individual flow paths communicating with each of the plurality of nozzles,
A supply-side common liquid chamber that extends in the second direction and communicates with the plurality of individual flow paths to supply the liquid to the plurality of individual flow paths.
A common liquid chamber on the discharge side, which extends in the second direction and communicates with the plurality of individual flow paths to allow the liquid discharged from the plurality of individual flow paths to flow.
A first bypass flow path connecting the supply-side common liquid chamber and the discharge-side common liquid chamber,
A second bypass flow path connecting the supply-side common liquid chamber and the discharge-side common liquid chamber,
An introduction flow path communicating with the supply-side common liquid chamber between the first bypass flow path and the second bypass flow path in the second direction.
Equipped with
The first bypass flow path has a first vertical portion extending from the supply-side common liquid chamber in a third direction opposite to the first direction.
The second bypass flow path has a second vertical portion extending in the third direction from the common liquid chamber on the supply side.
The first vertical portion is located in the fourth direction opposite to the second direction from the individual flow path arranged in the second direction.
The second vertical portion is located in the second direction with respect to the individual flow path arranged in the fourth direction.
Liquid injection head. The first vertical portion is located in the region most located in the second direction when the supply-side common liquid chamber is evenly divided into four regions parallel to the plane perpendicular to the second direction.
The second vertical portion is located in the region most located in the fourth direction when the supply-side common liquid chamber is evenly divided into the four regions in parallel with the plane perpendicular to the second direction. ,
The liquid injection head according to claim 1. The first vertical portion is located in the region most located in the second direction when the supply-side common liquid chamber is evenly divided into eight regions parallel to the plane perpendicular to the second direction.
The second vertical portion is located in the region most located in the fourth direction when the supply-side common liquid chamber is evenly divided into the eight regions in parallel with the plane perpendicular to the second direction. ,
The liquid injection head according to claim 2. A lead-out flow path that communicates with the discharge-side common liquid chamber between the first bypass flow path and the second bypass flow path in the second direction is provided.
The first bypass flow path has a third vertical portion extending in the third direction from the discharge side common liquid chamber.
The second bypass flow path has a fourth vertical portion extending in the third direction from the discharge side common liquid chamber.
The third vertical portion is located in the fourth direction with respect to the individual flow path arranged in the second direction.
The fourth vertical portion is located in the second direction with respect to the individual flow path arranged in the fourth direction.
The liquid injection head according to any one of claims 1 to 3. The supply-side common liquid chamber has a first region located from the introduction flow path to the first vertical portion, and a second region located in the second direction from the first vertical portion.
The third-direction surface of the second region is arranged in the first direction with respect to the third-direction surface of the first region.
The liquid injection head according to any one of claims 1 to 4. The second region has a portion having a dimension in the first direction that is less than half the maximum dimension of the first region in the first direction.
The liquid injection head according to claim 5. The liquid injection head according to any one of claims 1 to 6.
A moving mechanism that holds the liquid injection head and reciprocates the liquid injection head in a fifth direction orthogonal to the first direction and in a direction opposite to the fifth direction is provided.
The second direction is a direction that intersects with the fifth direction.
Liquid sprayer. The liquid injection head according to any one of claims 1 to 6 is provided.
The liquid injection head constitutes a long line head in the fifth direction orthogonal to the first direction.
The second direction is a direction that intersects with the fifth direction.
Liquid sprayer. The liquid injection head comprises a nozzle surface having the plurality of nozzles.
The nozzle surface is orthogonal to the radial direction of the axis along the fifth direction and is inclined with respect to the horizontal plane.
The liquid injection device according to claim 7. A first line head which is composed of the liquid injection head according to any one of claims 1 to 6 and is long in the fifth direction orthogonal to the first direction.
The second line head, which is composed of the liquid injection head according to any one of claims 1 to 6 and is elongated in the fifth direction, is orthogonal to the fifth direction when viewed in the direction of gravity. The second line head arranged in the sixth direction and
A transport mechanism that transports the medium and
Equipped with
In the first line head, the end portion of the first nozzle surface of the first line head in the sixth direction is the end portion of the first nozzle surface in the seventh direction opposite to the sixth direction. On the other hand, it is arranged at an angle so that it is located in the direction opposite to the direction of gravity.
In the second line head, the end portion of the second nozzle surface of the second line head in the sixth direction is located in the gravity direction with respect to the end portion of the second nozzle surface in the seventh direction. Is placed at an angle,
Liquid sprayer. The inclination angle of the first nozzle surface with respect to the horizontal plane is equal to the inclination angle of the second nozzle surface with respect to the horizontal plane.
The liquid injection device according to claim 10. A liquid injection device comprising the liquid injection head according to any one of claims 1 to 6. A circulation mechanism for circulating the liquid supplied into the liquid injection head is provided.
The liquid injection device according to any one of claims 7 to 12.

Images