Patent Publication Number: US-2022234355-A1

Title: Liquid ejection head and liquid ejection device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2021-009850, filed Jan. 25, 2021, the entire contents of which are incorporated herein by reference. 
     FIELD 
     Embodiments described herein relate generally to a liquid ejection head and a liquid ejection device. 
     BACKGROUND 
     Liquid ejection heads, such as ink jet heads, can be used in various liquid ejection devices. A liquid ejection head includes, for example, an actuator formed of a piezoelectric material that changes the pressure in a pressure chamber to eject a liquid, such as ink, from the pressure chamber. The liquid ejection head ejects liquid from a nozzle by operation of the actuator. 
     In recent years, the printing rate and printing speed of certain liquid ejection devices have been increasing. Therefore, the amount of heat generated in the pressure chamber of the liquid ejection head tends to increase. When the temperature of the pressure chamber rises, the temperature of the ink also increases, and thus the viscosity and other physical properties of the ink may change, which may affect printing. Heating of the ink (or other liquid) may cause the ink (or other liquid) to heat. It may be possible to cool the ink if the liquid ejection head is a circulating type liquid ejection head that circulates ink in and out of the head, but it is generally difficult to cool the ink if the liquid ejection head is a non-circulating type. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view illustrating a liquid ejection head according to an embodiment. 
         FIG. 2  is a perspective view illustrating a head body and a manifold unit of a liquid ejection head. 
         FIG. 3  is a cross-sectional view of a head body and a manifold. 
         FIG. 4  is a plan view of a head body. 
         FIG. 5  is a perspective view of a manifold of a manifold unit. 
         FIG. 6  is a perspective view illustrating a configuration of a manifold. 
         FIG. 7  depicts a liquid ejection device of an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     An object to be solved by an exemplary embodiment is to provide a liquid ejection head and a liquid ejection device capable of controlling the temperature of the ejected liquid. 
     In general, according to one embodiment, a liquid ejection head has a base plate with an actuator on an upper surface side of the base plate; a plurality of pressure chambers formed in the actuator; a first common chamber connected to a first side of the plurality of pressure chambers; a second common chamber connected to a second side of the plurality of pressure chambers, the pressure chambers connecting the first common chamber to the second common chamber; and a nozzle plate on an upper surface side of the actuator. The nozzle plate has a plurality of nozzles at positions respectively corresponding to the pressure chambers. A supply hole is in the base plate and connected to the first common chamber. A discharge hole is in the base plate and connected to the second common chamber. A manifold is on a lower surface side of the base plate. The manifold provides a liquid supply flow path for supplying liquid to the supply hole from a liquid feed port on a lower surface side of the manifold, a liquid discharge flow path for receiving liquid from the discharge hole, and a temperature control flow path through which a temperature control liquid can flow. 
     Hereinafter, a liquid ejection head according to certain example embodiments will be described with reference to the drawings. The drawings are not necessarily to scale and various changes, modifications, and alterations to the depicted aspects may be made without departing from the scope of the present disclosure. 
       FIG. 1  is a perspective view illustrating a configuration of the liquid ejection head  1 .  FIG. 2  is a perspective view illustrating a head body  11  and a manifold unit  12  of the liquid ejection head  1 .  FIG. 3  is a cross-sectional view illustrating aspects of the configuration of the head body  11  and the manifold unit  12 .  FIG. 4  is a plan view of the head body  11 .  FIGS. 5 and 6  are perspective views of the manifold unit  12 .  FIGS. 5 and 6  are views of the manifold unit  12  illustrated from different directions. 
     The liquid ejection head  1  is, for example, an ink jet head in a liquid ejection device  2 . The liquid ejection device  2  may be an ink jet recording device such as illustrated in  FIG. 7 . The liquid ejection head  1  is provided in a head unit  2130 . The head unit  2130  includes a supply tank  2132  for storing a liquid in the liquid ejection device  2 . 
     The liquid ejection head  1  is supplied with ink from the supply tank  2132 . The liquid ejection head  1  may be a circulating type head that circulates ink, or may be a non-circulating type head that does not circulate ink. In the present example, the liquid ejection head  1  will be described as a non-circulating type head. The liquid ejection head  1  is connected to a temperature control device  2116  provided in the liquid ejection device  2 . A temperature control liquid for controlling the temperature of the ink can be supplied. The temperature control liquid may be water, for example. 
     The liquid ejection head  1  illustrated in  FIGS. 1 to 3  includes a head body  11 , a manifold unit  12 , and a circuit board  13 . In some examples, the liquid ejection head  1  may include a cover for accommodating at least part of the head body  11 , the manifold unit  12 , and the circuit board  13 . 
     The head body  11  ejects a liquid. The head body  11  includes a base plate  111 , a frame  112 , an actuator  113  having a plurality of first pressure chambers  1131  and a plurality of second pressure chambers  1132 , and a nozzle plate  114 . 
     The head body  11  includes a first common liquid chamber  116  that communicates with the primary side of the first pressure chambers  1131  of the actuator  113  and a second common liquid chamber  117  that communicates with the secondary side of the first pressure chambers  1131  and the primary side of the second pressure chambers  1132  (see  FIG. 4 ). The head body  11  also includes a third common liquid chamber  118  that communicates with the secondary side of the second pressure chambers  1132 . The primary side of the first pressure chambers  1131  is the upstream side with respect to the direction in which the liquid flows through the head body in normal operation. The secondary side of the first pressure chambers  1131  is the downstream side. The primary side of the second pressure chambers  1132  is the upstream side. The secondary side of the plurality of second pressure chambers  1132  is the downstream side. 
     In the present embodiment, the head body  11  includes a pair of actuators  113 , one first common liquid chamber  116  between the pair of actuators  113 , a pair of second common liquid chambers  117  (one on each side of the pair of actuators  113 ), and a pair of third common liquid chambers  118  (one on each end of the pair of actuators  113 ). 
     The base plate  111  is formed in a square plate shape of, for example, a ceramic material. The base plate  111  includes one or more supply holes  1111  and one or more discharge holes  1112 . The supply hole(s)  1111  and the discharge hole(s)  1112  are through holes penetrating the base plate  111 . 
     A supply hole  1111  is provided, for example, at a position facing the first common liquid chamber  116 . The supply hole  1111  is, for example, an elongated hole or slot with its long dimension along the longitudinal direction of the first common liquid chamber  116 . 
     A discharge hole  1112  is provided, for example, at positions facing each third common liquid chamber  118 . The discharge hole  1112  is provided in the base plate  111  adjacent to second pressure chambers  1132  at each end of the base plate  111 . 
     The frame  112  is fixed to one side of the base plate  111  with an adhesive or the like. The frame  112  surrounds the supply hole  1111 , the discharge holes  1112 , and the actuators  113  on the base plate  111 . 
     For example, the frame  112  is formed in a rectangular frame shape. The actuators  113 , the supply hole  1111 , and the discharge holes  1112  are positioned to be inside the opening of the frame  112 . 
     Each actuator  113  is formed in a plate shape. Each actuator  113  is disposed in the opening of the frame  112  and adhered to the base plate  111 . The actuators  113  comprise rectangular plate-shaped piezoelectric materials adhered to each other so as to face each other with the polarization directions thereof opposite to each other. 
     In this context, the piezoelectric material is, for example, lead zirconate titanate (PZT). Each actuator  113  has a plurality of first pressure chambers  1131  disposed at equal intervals along the length direction of the base plate  111 . The first pressure chambers  1131  are disposed in two rows on each side of the centerline of the base plate  111 . Each actuator  113  also has a plurality of second pressure chambers  1132  disposed at both ends of the base plate  111 . The second pressure chambers  1132  at each end are at equal intervals and in two rows on both sides of the centerline of the baseplate  111  like the first pressure chambers  1131 . Each actuator  113  can be said to have a plurality of grooves formed on the main surface side opposite to the base plate  111  side. The first pressure chambers  1131  and the second pressure chambers  1132  are formed in these grooves. Further, each actuator  113  is formed in conjunction with a wiring pattern for driving each pressure chamber  1131 . 
     A first pressure chamber  1131  used as a pressure chamber for ejecting ink from a corresponding nozzle  1141  during printing or the like. A second pressure chamber  1132  is a maintenance pressure chamber used for ejecting ink from a nozzle  1141  during a maintenance operation. 
     The nozzle plate  114  is a plate shape. The nozzle plate  114  is fixed to the frame  112  with an adhesive or the like. The nozzle plate  114  has a plurality of nozzles  1141  formed at positions facing the first pressure chambers  1131  and the second pressure chambers  1132 . In the present embodiment, the nozzle plate  114  includes two nozzle rows  1142  each with a plurality nozzles  1141  arranged in a line. 
     Among the plurality of nozzles  1141 , the those facing the plurality of first pressure chambers  1131  are holes for ejecting ink during printing operations or the like. Among the plurality of nozzles  1141 , the those facing the plurality of second pressure chambers  1132  are holes used for purging ink during maintenance operations or the like. 
     The first common liquid chamber  116  is formed between the facing pair of actuators  113 . The first common liquid chamber  116  does not extend all the way to the ends of the actuators  113 . The first common liquid chamber  116  forms an ink flow path from the supply hole  1111  to the primary (entrance) side of the plurality of first pressure chambers  1131  of each actuator  113 . 
     A second common liquid chamber  117  is formed to be between the frame  112  and the outside of each actuator  113 . The second common liquid chamber  117  forms an ink flow path from the secondary (exit) side of the plurality of first pressure chambers  1131  to the primary side of some of the plurality of second pressure chambers  1132 . 
     The third common liquid chamber  118  is separated from the first common liquid chamber  116  by, for example, a partition wall  1181 . A third common liquid chamber  118  is formed between the end portions of the pair of actuators  113 , and forms an ink flow path from the secondary (exit) side of the second pressure chambers  1132  at each end of actuators  113  to a discharge hole  1112 . 
     The manifold unit  12  includes a manifold  121 , a top plate  122 , an ink supply pipe  123 , an ink discharge pipe  124 , a temperature control water supply pipe  125 , a temperature control water discharge pipe  126 , and a base block  127 . The number of ink supply pipes  123  (alternatively, liquid supply pipes  123  when a liquid other than ink is utilized), ink discharge pipes  124  (alternatively, liquid discharge pipes  124  when a liquid other than ink is utilized), temperature control water supply pipes  125 , and temperature control water discharge pipes  126  can be arbitrarily set. 
     In the present embodiment, the manifold unit  12  includes one ink supply pipe  123 , one ink discharge pipe  124 , one temperature control water supply pipe  125 , and one temperature control water discharge pipe  126 , but other examples may vary in these numbers. 
     As illustrated in  FIGS. 5 and 6 , the manifold  121  can be formed in a plate shape or a block shape. The manifold  121  includes an ink supply flow path  1211  (liquid supply flow path), an ink discharge flow path  1212  (liquid discharge flow path), and a temperature control flow path  1213 . One side of the manifold  121  is fixed to the base plate  111 . The ink supply pipe  123 , the ink discharge pipe  124 , the temperature control water supply pipe  125 , and the temperature control water discharge pipe  126  are attached to the manifold  121  via the base block(s)  127  ( FIG. 3 ). 
     The ink supply flow path  1211  is formed in the manifold  121  as holes and grooves. The ink supply flow path  1211  fluidly connects the ink supply pipe  123  and the supply hole  1111  of the base plate  111 . 
     The ink supply flow path  1211  includes an ink supply opening  12111  ( FIG. 3 ) that is longer in one direction. The ink supply opening  12111  is provided in the surface of the manifold  121  to which the base plate  111  is fixed. The ink supply opening  12111  matches in position to the region provided with the supply hole  1111  disposed in the first common liquid chamber  116 . 
     In the present embodiment, the ink supply flow path  1211  extends in the longitudinal direction from the ink supply point (where ink is supplied from the ink supply pipe  123 ) in one branch towards the center of the manifold  121 . A portion of the ink supply flow path  1211  then extends in the lateral (width) direction of the manifold  121  to connect to a slit that extends along the longitudinal direction of the first common liquid chamber  116  in the center of the manifold  121 . This central slit can be considered as a portion of the ink supply flow path  1211 . The base plate  111  side end of this slit forms the ink supply opening  12111 . 
     The ink discharge flow path  1212  is a flow path formed in the manifold  121  by holes and grooves. The ink discharge flow path  1212  fluidly connects the ink discharge pipe  124  and the discharge holes  1112 . 
     The ink discharge flow path  1212  includes two ink discharge openings  12121  (see  FIG. 6 ) on the surface of the manifold  121  to which the base plate  111  is fixed. The two ink discharge openings  12121  match each of the regions provided with the discharge holes  1112 . A discharge hole  1112  is disposed in correspondence with each of the third common liquid chambers  118 , respectively. In the ink discharge flow path  1212 , the two ink discharge openings  12121  communicate with each other by a groove in the surface of the manifold  121  opposite from that to which the base plate  111  is fixed. 
     The temperature control flow path  1213  is a flow path formed in the manifold  121  by holes and grooves. The temperature control flow path  1213  fluidly connects the temperature control water supply pipe  125  and the temperature control water discharge pipe  126 . 
     The ends of the temperature control flow path  1213  are openings connected to the temperature control water supply pipe  125  and the temperature control water discharge pipe  126 . The control flow path  1213  is formed so as to permit the exchange of heat with the base plate  111  when fixed to the manifold  121 . 
     That is, a part of the temperature control flow path  1213  is provided as a groove in the surface of the manifold  121  to which the base plate  111  is fixed. In the present embodiment, the temperature control flow path  1213  has a configuration in which a pair of temperature control water openings  12131  are provided in the surface of the manifold  121  to which the base plate  111  is fixed. The primary (entrance) side and the secondary (exit) side of the temperature control water openings  12131  communicate with each other via a groove in the surface opposite from the side of the manifold  121  to which the base plate  111  is fixed. 
     The temperature control water opening  12131  can be provided in a region corresponding to the pressure chambers  1131  and  1132  of the base plate  111 , ora region corresponding to the second common liquid chamber  117  of the base plate  111 . Heat is generated by the driving of the first pressure chambers  1131 , and the temperature of the first pressure chamber  1131  and thus the temperature of the ink in the first pressure chamber  1131  and on the secondary side (second common liquid chamber  117 ) of the first pressure chamber  1131  rise. Therefore, the temperature control of at least either the plurality of first pressure chambers  1131  or the second common liquid chamber  117  is generally required. 
     In the present embodiment, a temperature control water opening  12131  is provided in the region corresponding to each of the second common liquid chambers  117 . Particularly, the temperature control flow path  1213  is provided with two different temperature control water openings  12131  with branches into two at the side to which the temperature control water supply pipe  125  is connected from the side to which the base plate  111  is fixed. 
     That is, the manifold  121  of the present embodiment includes a pair of temperature control water openings  12131  formed on the side to which the base plate  111  is fixed. The temperature control water openings  12131  form a part of the temperature control flow path  1213 . When manifold  121  and the base plate  111  are fixed to each other, the water flowing through each temperature control water opening  12131  exchanges heat with a region corresponding to second common liquid chambers  117  of the base plate  111 . In this way, a temperature control flow path  1213  that connects the temperature control water supply pipe  125  and the temperature control water discharge pipe  126  is formed. 
     The top plate  122  is provided on the surface of the manifold  121  opposite from the base plate  111 . The top plate  122  covers the manifold  121  to seal the ink supply flow path  1211 , the ink discharge flow path  1212 , and the temperature control flow path  1213 . The top plate  122  includes openings  1221  at positions facing the primary side and the secondary side of the ink supply flow path  1211 , the ink discharge flow path  1212 , and the temperature control flow path  1213 . These openings  1221  permit the flow paths  1211 ,  1212 , and  1213  to be fluidly connected to the pipes  123 ,  124 ,  125 , and  126 . 
     The ink supply pipe  123  is connected to the ink supply flow path  1211  via a base block  127  and an opening  1221  of the top plate  122 . The ink discharge pipe  124  is connected to the ink discharge flow path  1212  via a base block  127  and an opening  1221  of the top plate  122 . The temperature control water supply pipe  125  is connected to the primary side of the temperature control flow path  1213  via a base block  127  and an opening  1221  of the top plate  122 . The temperature control water discharge pipe  126  is connected to the second side of the temperature control flow path  1213  via a base block  127  and an opening  1221  of the top plate  122 . 
     In the present embodiment, the ink supply pipe  123 , the ink discharge pipe  124 , and one of the temperature control water supply pipe  125  or the temperature control water discharge pipe  126  are all disposed at one end of the manifold  121 . The other one of the temperature control water supply pipe  125  or the temperature control water discharge pipe  126  is disposed on the other end of the manifold  121 . In the present example, the temperature control water supply pipe  125  is grouped on the end of the manifold  121  with the ink supply pipe  123  and the ink discharge pipe  124 , and the temperature control water discharge pipe  126  is provided alone on the other end of the manifold  121 . 
     The ink supply pipe  123  and the ink discharge pipe  124  are disposed side by side with one another in the lateral (width) direction of the manifold  121 . The temperature control water supply pipe  125  is disposed adjacent to the ink supply pipe  123  and the ink discharge pipe  124 . In this example, the temperature control water supply pipe  125  is disposed closer to the center of the manifold  121  than the ink supply pipe  123  and the ink discharge pipe  124 . 
     In the present example, two separate base blocks  127  are provided. One base block  127  supports the ink supply pipe  123 , the ink discharge pipe  124 , and the temperature control water supply pipe  125 . The other base block  127  supports the temperature control water discharge pipe  126 . Each base block  127  is fixed to the top plate  122 . For example, the base block  127  includes a flow path therein, and fluidly connects a supported pipe to an opening  1221  in the top plate  122 . 
     The circuit board  13  includes a wiring film  131  with one end connected to the wiring pattern of the actuator  113 . A driver IC  132  of the circuit board  13  is mounted on the wiring film  131 , and a printed wiring board  133  of the circuit board  13  is mounted on the other end of the wiring film  131  opposite from the end connected to the wiring pattern of the actuator. 
     The circuit board  13  drives the actuator  113  by applying a drive voltage to the wiring pattern of the actuators  113  by using the driver IC  132 . The driving of an actuator  113  in this manner increases or decreases the volume of the pressure chamber(s)  1131 , which can operate to eject liquid droplets from a nozzle  1141 . 
     A plurality of wiring films  131  can be provided, for example. In the present embodiment, two wiring films  131  are connected to each actuator  113 . The wiring film  131  is, for example, a Chip on Film (COF) on which the driver IC  132  is mounted. The driver IC  132  is electrically connected to the wiring pattern (electrodes) formed in the pressure chambers  1131  via the wiring film  131 . The printed wiring board  133  can be a printing wiring assembly (PWA) on which various electronic components and connectors are mounted. 
     The liquid ejection head  1  can be incorporated in, for example, an ink jet recording device  2  such as illustrated in  FIG. 7  or other type of the liquid ejection device. The liquid ejection head  1  is connected to the supply tank  2132  provided in the ink jet recording device  2 . The liquid ejection head  1  can be a circulating type head that circulates ink to and from the supply tank  2132  through the liquid ejection head  1  or a non-circulating type head that is supplied with ink from the supply tank  2132  and then discharges ink into a maintenance device  2117  during maintenance operations. The liquid ejection head  1  is disposed, for example, in a posture in which the nozzles  1141  of the nozzle plate  114  faces downward towards a recording medium (e.g., a sheet or paper) or the like. 
     As depicted in  FIG. 7 , the ink jet recording device  2  includes a housing  2111 , a medium supply unit  2112 , an image forming unit  2113 , a medium discharge unit  2114 , a conveyance device  2115 , a temperature control device  2116 , a maintenance device  2117 , and a control unit  2118 . 
     The ink jet recording device  2  in this example is an ink jet printer that performs an image forming process on paper P by ejecting a liquid, such as ink, while paper P is being conveyed along a predetermined conveyance path  2001  from the medium supply unit  2112  to the medium discharge unit  2114  through the image forming unit  2113 . 
     The medium supply unit  2112  includes a plurality of paper feeding cassettes  21121 . The image forming unit  2113  includes a support unit  2120  (that supports paper thereon during the printing process) and a plurality of head units  2130  that are disposed adjacent to each other above the support unit  2120 . The medium discharge unit  2114  includes a paper discharge tray  21141 . 
     The support unit  2120  includes a conveyance belt  21201  provided in a loop shape, a support plate  21202  for supporting the conveyance belt  21201  from the back side, and a plurality of belt rollers  21203  provided on the back side of the conveyance belt  21201 . 
     Each head unit  2130  includes a liquid ejection head  1 , a supply tank  2132  connected to the liquid ejection head  1 , a pump  2134  for supplying ink, and a connection flow path  2135  connecting the liquid ejection head  1  and the supply tank  2132 . 
     In the present embodiment, liquid ejection heads  1  for four colors (cyan, magenta, yellow, and black) are provided, and thus four supply tanks  2132  accommodating ink of each of these four colors are provided. Each supply tank  2132  is connected to the liquid ejection head  1  by a connection flow path  2135 . 
     The pump  2134  is a liquid feed pump composed of, for example, a piezoelectric pump. The pump  2134  is connected to the control unit  2118  and can be driven and controlled by the control unit  2118 . 
     Each connection flow path  2135  includes a supply flow path connected to the ink supply pipe  123  of the liquid ejection head  1 . The connection flow path  2135  also includes a collection flow path connected to the ink discharge pipe  124  of the liquid ejection head  1 . If the liquid ejection head  1  is a circulating type, the collection flow path will be connected to the supply tank  2132 . If the liquid ejection head  1  is a non-circulating type, the collection flow path will be connected to the maintenance device  2117 . 
     The conveyance device  2115  conveys the paper P along the conveyance path  2001  from the paper feeding cassette  21121  to the paper discharge tray  21141  through the image forming unit  2113 . The conveyance device  2115  includes guide plate pairs  21211  to  21218  (guide plate pairs  21211 ,  21212 ,  21213 ,  21214 ,  21215 ,  21216 ,  21217 ,  21218 ) and conveyance rollers  21221  to  21228  (conveyance rollers  21221 ,  21222 ,  21223 ,  21224 ,  21225 ,  21226 ,  21227 ,  21228 ) disposed at different points along the conveyance path  2001 . The conveyance device  2115  supports the paper P so that the paper can be moved relative to the liquid ejection head  1 . 
     The temperature control device  2116  includes a temperature control water tank  21161 , a temperature control flow circuit  21162  (such as pipes and tubes) for supplying temperature control water, a pump that supplies the temperature control water, a temperature controller that adjusts the temperature of temperature control water, and the like. The temperature control device  2116  supplies the temperature control water from the temperature control water tank  21161  at a predetermined temperature controlled by the temperature controller to the temperature control water supply pipe  125  via the temperature control flow circuit  21162  by action of the pump. The temperature control device  2116  also collects the water discharged from the temperature control water discharge pipe  126  through the manifold  121  back into the temperature control water tank  21161  via the temperature control flow circuit  21162 . The temperature controller is, for example, a heater or a cooler. 
     The maintenance device  2117  functions during maintenance to suction and collect ink remaining on the outer surface of the nozzle plate  114 , for example. If the liquid ejection head  1  is a non-circulating type, the maintenance device  2117  collects ink in the head body  11  through a nozzle(s)  1141  facing the second pressure chambers  1132  during maintenance. The maintenance device  2117  includes a tray, a tank, or the like for storing the collected ink. 
     The control unit  2118  includes a CPU  21181  (one example of a processor), a memory such as a read only memory (ROM) for storing various programs, a random access memory (RAM) for temporarily storing various data and image data, and an interface unit for data input from the outside and data output to the outside. 
     Next, the flow of ink and the flow of temperature control water for temperature control of the liquid ejection head  1  will be described. First, when the ink supplied to the ink supply pipe  123 , the ink flows through the two ink supply flow paths  1211  of the manifold  121 . Then, the ink moves from the supply hole  1111  of the base plate  111  facing the ink supply opening  12111  of the ink supply flow path  1211  to the first common liquid chamber  116 . 
     The ink that has moved to the first common liquid chamber  116  moves to the second common liquid chamber  117  by passage through the plurality of first pressure chambers  1131  as illustrated by arrows in  FIG. 4 . If a first pressure chamber  1131  is driven, the ink in the first pressure chamber  1131  will be ejected from the nozzle  1141 . Any ink not ejected from the nozzle  1141  moves to the corresponding second common liquid chamber  117 . 
     When the liquid ejection head  1  is a non-circulating type, the ink in the second common liquid chamber  117  moves to the third common liquid chamber  118  via second pressure chambers  1132  and accumulates in the third common liquid chamber  118 . Then, if the secondary side of the ink discharge pipe  124  is opened during maintenance or the like, the ink in the second common liquid chamber  117  moves to the ink discharge pipe  124  through the discharge hole  1112  of the base plate  111  and the ink discharge flow path  1212  of the manifold  121 . Furthermore, by driving a second pressure chamber  1132  during maintenance or the like, the ink in the second pressure chamber  1132  will be ejected together with air accumulated in the second common liquid chamber  117  and the third common liquid chamber  118 , for example, this operates to bleed air from the liquid ejection head  1 . 
     When the liquid ejection head  1  is a circulating type, the third common liquid chamber  118  is not necessarily provided, and the discharge hole  1112  can be provided in the second common liquid chamber  117 . The ink in the second common liquid chamber  117  moves to the ink discharge pipe  124  through the discharge hole  1112  of the base plate  111  and the ink discharge flow path  1212  of the manifold  121 . 
     If water (temperature control water) is supplied to the temperature control water supply pipe  125 , the water flows through the temperature control flow path  1213  of the manifold  121  and moves to the temperature control water discharge pipe  126 . The water comes into contact with the base plate  111  at the temperature control water opening  12131 , exchanges heat with the base plate  111 , and which can cool the base plate  111  or otherwise regulates temperature of the base plate  111 . 
     As a result, the ink in the plurality of pressure chambers  1131  and  1132  along with the pressure chambers  1131  and  1132  themselves can be cooled. Alternatively, ink of the second common liquid chamber  117  can be cooled. In some examples, the water (temperature control water) may be utilized to heat the ink instead of cooling the ink. That is, the temperature control water may be either cooled or heated to maintain the temperature of the ink at a level suitable for ejection from the nozzles. In some examples, the ink may be heated before the pressure chamber  1131  is driven, and then cooled after the pressure chamber  1131  is driven. 
     With the liquid ejection head  1  and the liquid ejection device  2  configured in this way, it is possible to control the temperature of the ink regardless of whether a circulating type or a non-circulating type liquid ejection head  1  is adopted. 
     In an above-described example, the head body  11  was described as a non-circulating type, but the head body  11  may be a circulating type instead. The head body  11  in some examples may have a configuration that does not include the third common liquid chamber  118 . 
     In an above-described example, the flow of ink in one system for supplying ink from one first common liquid chamber  116  to a pair of actuators  113  was described, but the present disclosure is not limited thereto. For example, the flow of ink in two systems may be adopted, with one first common liquid chamber  116  being provided for each actuator  113 . Such a liquid ejection head  1  may include, for example, two ink supply pipes  123  and two ink discharge pipes  124 , and two ink supply flow paths  1211  and two ink discharge flow paths  1212  in the manifold  121 . 
     The flow paths in manifold unit  12  can be varied in number and type as appropriate. That is, the shape and configuration of the ink supply flow path  1211 , the ink discharge flow path  1212 , the temperature control flow path  1213 , and the positioning of pipes  123 ,  124 ,  125 , and  126  can be appropriately varied in the manifold unit  12  to correspond to the configuration of the head body  11  and the common liquid chambers  116 ,  117 , and  118 . 
     The liquid ejection head  1  and the liquid ejection device  2  are not limited to applications in recording devices and/or ink jet printers. That is, the liquid ejection head  1  and the liquid ejection device  2  can be used, for example, in a 3D printer, an industrial manufacturing machine, and medical applications, and the temperature of the liquid ejected from the head body  11  can be controlled according to embodiments of the present disclosure. 
     While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.