JP5447203B2 - Liquid ejector - Google Patents

Description

  The present invention relates to a liquid ejecting apparatus.

  In a conventional liquid ejecting apparatus, a method is employed in which the diaphragm pump is driven by repeatedly pressurizing and depressurizing air in the air chamber of the diaphragm to send liquid to the liquid ejecting head. A liquid supply system using a diaphragm is disclosed in Patent Document 1.

  Further, in the conventional liquid ejecting apparatus, when the inside of the liquid supply flow path is cleaned, a pressurized liquid is introduced from the choke valve in a state where the pressure in the flow path is reduced, and along with the liquid having an increased flow velocity, A method of discharging foreign matter in the flow path is used (for example, Patent Document 2).

  In addition, in a liquid supply system including a tube pump, Patent Document 3 discloses a liquid ejecting apparatus that detects a remaining amount of liquid from the number of rotations of a rotor included in the tube pump.

JP 2006-272661 A JP 2006-82349 A Japanese Patent Laid-Open No. 8-238783

  However, the liquid supply system using the diaphragm pump described in Patent Document 1 has a problem of high cost because there are many components. In Patent Document 2, in cleaning the liquid supply flow path using the choke valve, the liquid sucked to make the flow path in a negative pressure state is wasted, and the choke valve is opened and closed for each flow path. The problem is that variations occur. In patent document 3, in the tube pump which comprises a liquid supply system, there exists a subject that the liquid delivery amount tends to vary by variation in the rotational speed of a rotor.

  SUMMARY An advantage of some aspects of the invention is that it provides a liquid ejecting apparatus including a liquid supply system that can stably supply a liquid and can be manufactured at low cost.

  The liquid ejecting apparatus of the present invention employs the following means in order to solve the above problems. That is, the present invention provides a self-sealing valve and a tube pump that are connected in order from the liquid ejecting head side to a liquid supply flow path that connects the liquid reservoir and the liquid ejecting head, and the self-sealing valve and the tube pump. And a circulation passage extending from the outlet side of the pressure regulating valve between the liquid reservoir and the tube pump.

  According to the above configuration, the choke state can be created in the liquid supply channel by causing the tube pump to bite the roller into the liquid supply channel. Accordingly, there are fewer components than the configuration using the pump and the choke valve, and the cost can be reduced.

  The self-sealing valve is opened only when there is liquid consumption in the liquid ejecting head. Therefore, when the liquid ejecting head is filled with liquid, the liquid ejecting head is in a closed state so that no pressure is applied to the liquid in the head. Therefore, even if the amount of liquid delivered from the tube pump varies, the pressure applied to the liquid in the liquid ejecting head is kept constant.

  Further, when the pressure of the accumulated liquid exceeds a certain value between the self-sealing valve and the tube pump, the pressure regulating valve is opened and the liquid is circulated by the circulation channel. Thereby, the pressure in the liquid supply channel is kept constant.

  The liquid ejecting apparatus of the present invention includes a self-sealing valve and a tube pump connected in order from the liquid ejecting head side to a liquid supply channel connecting the liquid storing unit and the liquid ejecting head, the liquid storing unit, A check valve having an outlet side connected to the tube pump, and a circulation having a predetermined pressure resistance extending from the inlet side of the check valve between the self-sealing valve and the tube pump And a flow path.

  According to the above configuration, in the tube pump, a choke state can be created in the liquid supply flow path by causing the roller to engage the liquid supply flow path. Therefore, since the choke member is unnecessary, there are fewer components than the case where liquid is supplied by a diaphragm, and the cost can be reduced.

  The self-sealing valve is opened only when there is liquid consumption in the liquid ejecting head. Therefore, when the liquid is filled in the liquid ejecting head, no pressure is applied from the liquid. Therefore, even if the amount of liquid delivered from the tube pump varies, the pressure applied to the liquid in the liquid ejecting head is kept constant.

  Further, since the circulation channel has a resistance corresponding to a predetermined pressure, the liquid flows into the circulation channel unless the pressure of the accumulated liquid exceeds a certain value between the self-sealing valve and the tube pump. do not do. Therefore, as long as the pressure in the liquid supply channel is equal to or lower than the predetermined value, the pressure in the channel is maintained.

  Further, the check valve provided in the circulation channel prevents liquid from flowing through the circulation channel when the liquid is sucked from below the liquid jet head during cleaning.

  In the liquid ejecting apparatus of the present invention, the tube pump pressurizes the tube in one rotation direction and the tube pressurizes the tube in the other rotation direction with a tube that discharges the liquid sucked from one end from the other end. And a rotor for releasing the state.

  According to the above configuration, it is possible to switch between the pressurized state and the atmospheric pressure state by simply changing the rotation direction of the rotor, so that the flow path is not pressurized when not in use. It becomes easy.

  The liquid ejecting apparatus of the invention includes a plurality of the liquid supply channels, and each tube pump of the plurality of liquid supply channels has a common rotor rotation shaft.

  According to the above configuration, since only one rotor rotation shaft is required, the number of components can be reduced and the cost can be reduced as compared with the case where the tube pump has each rotor rotation shaft.

It is sectional drawing which shows the structure of the liquid ejecting apparatus which concerns on 1st and 2nd embodiment. FIG. 6 is a cross-sectional view illustrating a configuration of a liquid ejecting head. FIG. 6 is a cross-sectional view of a main part of the liquid jet head. It is a mimetic diagram showing the liquid supply system concerning a first embodiment. It is sectional drawing which shows the structure of a tube pump. It is a schematic diagram which shows the liquid supply system which concerns on 2nd embodiment. It is sectional drawing which shows the structure of the liquid ejecting apparatus which concerns on 3rd and 4th embodiment. It is a schematic diagram which shows the liquid supply system which concerns on 3rd embodiment. It is a schematic diagram which shows the liquid supply system which concerns on 4th embodiment.

  Hereinafter, an embodiment of a liquid ejecting apparatus of the invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating a schematic configuration of a liquid ejecting apparatus PRT according to the first embodiment. In this embodiment, an example of an ink jet type liquid ejecting apparatus will be described as an example of the liquid ejecting apparatus PRT.

  The liquid ejecting apparatus PRT illustrated in FIG. 1 is an apparatus that performs a printing process while conveying a sheet-like medium M such as paper or a plastic sheet. The liquid ejecting apparatus PRT includes a housing PB, an ink jet mechanism IJ that ejects ink (liquid) onto the medium M, a liquid storage unit IS that supplies ink to the ink jet mechanism IJ, and a transport mechanism CV that transports the medium M. A maintenance mechanism MN that performs a maintenance operation of the inkjet mechanism IJ and a control device CONT that controls these mechanisms are provided.

  Hereinafter, an XYZ rectangular coordinate system is set, and the positional relationship of each component will be described with reference to the XYZ rectangular coordinate system as appropriate. In the present embodiment, for example, the conveyance direction of the medium M is the X direction, the direction perpendicular to the X direction on the conveyance surface of the medium M is the Y direction, and the direction perpendicular to the plane including the X axis and the Y axis is the Z direction. write. The rotation direction around the X axis is the θX direction, the rotation direction around the Y axis is the θY direction, and the rotation direction around the Z axis is the θZ direction.

  The housing PB is formed, for example, with the Y direction as a longitudinal direction. Each part of the inkjet mechanism IJ, the liquid storage unit IS, the transport mechanism CV, the maintenance mechanism MN, and the control device CONT is attached to the housing PB. For example, a platen 13 is provided in the housing PB. The platen 13 is a support member that supports the medium M. The platen 13 is disposed, for example, at the center in the X direction of the housing PB. The platen 13 has a flat surface 13a oriented in the + Z direction. The flat surface 13a is used as a support surface that supports the medium M.

  The transport mechanism CV includes, for example, a transport roller and a motor that drives the transport roller. For example, the transport mechanism CV transports the medium M into the housing PB from the −X side of the housing PB and discharges the medium M from the + X side of the housing PB to the outside of the housing PB. The transport mechanism CV transports the medium M so that the medium M passes over the platen 13 inside the housing PB. In the transport mechanism CV, for example, the transport timing and transport amount are controlled by the control device CONT.

  The ink jet mechanism IJ includes a liquid ejecting head H that ejects ink, and a head moving mechanism AC that holds and moves the liquid ejecting head H. The liquid ejecting head H ejects ink toward the medium M sent onto the platen 13. The liquid ejecting head H has an ejecting surface Ha that ejects ink. The ejection surface Ha is directed, for example, in the −Z direction, and is disposed so as to face the support surface 13a of the platen 13, for example.

  The head moving mechanism AC has a carriage 4. The liquid ejecting head H is fixed to the carriage 4. The carriage 4 is in contact with a guide shaft 8 that extends in the longitudinal direction (X direction) of the housing PB. The liquid ejecting head H and the carriage 4 are arranged in the + Z direction of the platen 13, for example.

  In addition to the carriage 4, the head moving mechanism AC includes, for example, a pulse motor 9, a drive pulley 10 that is rotationally driven by the pulse motor 9, and a drive pulley 10 that is provided on the opposite side in the width direction of the housing PB. It has a rolling pulley 11 and a timing belt 12 that is stretched between the driving pulley 10 and the idle pulley 11 and connected to the carriage 4.

  The carriage 4 is connected to the timing belt 12. The carriage 4 is provided to be movable in the Y direction as the timing belt 12 rotates. When moving in the Y direction, the carriage 4 is guided by a guide shaft 8.

  The liquid storage unit IS supplies ink to the liquid ejecting head H. For example, a plurality of ink cartridges 6 are accommodated in the liquid storage unit IS. The liquid ejecting apparatus PRT of the present embodiment has a configuration (off-carriage type) in which the ink cartridge 6 is accommodated at a position different from the liquid ejecting head H. The liquid reservoir IS has a liquid supply channel TB that connects, for example, the liquid ejecting head H and the ink cartridge 6. The liquid storage unit IS has a pump mechanism (not shown) that supplies ink stored in the ink cartridge 6 to the liquid ejecting head H via the liquid supply channel TB. The maintenance mechanism MN is disposed at the home position of the liquid ejecting head H. This home position is set, for example, in an area outside the area where printing is performed on the medium M. In the present embodiment, for example, the home position is set on the + Y side of the platen 13. The home position is a place where the liquid ejecting head H stands by, for example, when the power of the liquid ejecting apparatus PRT is off or when recording is not performed for a long time.

  The maintenance mechanism MN includes, for example, a capping mechanism CP that covers the ejection surface Ha of the liquid ejection head H, a wiping mechanism WP that wipes the ejection surface Ha, and the like. A suction mechanism SC such as a suction pump is connected to the capping mechanism CP. By the suction mechanism SC, the capping mechanism CP can suck the space on the ejection surface Ha while covering the ejection surface Ha, for example. The waste ink discharged from the liquid ejecting head H to the maintenance mechanism MN side is recovered by, for example, a waste liquid recovery mechanism (not shown).

  FIG. 2 is a side cross-sectional view illustrating a configuration of the liquid ejecting head H. FIG. 3 is a cross-sectional view of a main part for explaining the configuration of the liquid jet head H. As shown in FIG. 2, the liquid ejecting head H includes an introduction needle unit 17, a head case 18, a flow path unit 19, and an actuator unit 20.

  Two ink introduction needles 22 are attached to the upper surface of the introduction needle unit 17 side by side with the filter 21 interposed. An ink introduction path 23 corresponding to each ink introduction needle 22 is formed inside the introduction needle unit 17. The upper end of the ink introduction path 23 is connected to the ink introduction needle 22 through the filter 21. The lower end of the ink introduction path 23 is connected to a case flow path 25 inside the head case 18 via a packing 24. A sub tank 2 is attached to each of the ink introduction needles 22.

  The sub tank 2 is formed using a resin material such as polypropylene, for example. An ink chamber 27 is provided in the sub tank 2. The ink chamber 27 has a concave portion 27a formed in a mortar shape, for example. The recess 27a has an opening 27b. A transparent elastic sheet 26 is attached to the opening 27b. A communication hole 27c is formed at the bottom of the recess 27a. The communication hole 27c is formed to communicate between the recess 27a of the ink chamber 27 and the ink supply chamber 27d. The ink supply chamber 27d is connected to, for example, the liquid supply channel TB. For example, a filter (not shown) or the like is provided at a connection portion of the ink supply chamber 27d with the liquid supply channel TB, for example.

  The elastic sheet 26 is stuck so as to close the opening 27b. The elastic sheet 26 expands and contracts according to the pressure in the ink chamber 27. For example, when the pressure in the ink chamber 27 becomes higher than the external pressure, the elastic sheet 26 expands toward the outside of the recess 27a, and the volume of the ink chamber 27 increases. When the pressure in the ink chamber 27 becomes lower than the external pressure, the ink chamber 27 expands toward the inside of the recess 27a, and the volume of the ink chamber 27 decreases.

  A valve 27 e is attached to the elastic sheet 26. The valve 27e is connected to the ink supply chamber 27d from the recess 27a through the communication hole 27c, and is formed to open and close the communication hole 27c from the ink supply chamber 27d side. The valve 27e opens and closes the communication hole 27c in conjunction with the expansion and contraction of the elastic sheet 26. Specifically, the communication hole 27c is opened when the elastic sheet 26 expands in the direction of decreasing the volume of the ink chamber 27, and the communication hole when the elastic sheet 26 expands in the direction of increasing the volume of the ink chamber 27. 27c is closed. An urging member 27f for applying a predetermined elastic force is attached to the valve 27e, and the opening / closing pressure of the communication hole 27c is adjusted.

  The sub tank 2 is connected to the needle connecting portion 28. The needle connection portion 28 is a portion that connects the ink introduction needle 22 sub-tank 2 and the ink introduction needle 22. In the concave portion 27 a of the ink chamber 27, a connection channel 29 connected to the needle connection portion 28 is formed. A seal material 31 into which the ink introduction needle 22 is fitted with almost no gap is provided in the internal space of the needle connection portion 28. By fitting the ink introduction needle 22 into the sealing material 31, the sub tank 2 and the introduction needle unit 17 are connected with almost no leakage.

  As shown in FIG. 3, the head case 18 is formed using a synthetic resin or the like. The head case 18 is formed in a box shape so as to have a hollow portion, for example. The head case 18 has an introduction needle unit 17 attached to the upper end side via a packing 24. A flow path unit 19 is joined to the lower end surface of the head case 18. The actuator unit 20 is accommodated in a hollow portion 37 formed inside the head case 18.

  A case channel 25 is provided inside the head case 18 so as to penetrate the height direction. The upper end of the case flow path 25 communicates with the ink introduction path 23 of the introduction needle unit 17 through the packing 24. The lower end of the case flow path 25 communicates with the common ink chamber 44 in the flow path unit 19. Therefore, the ink L introduced from the ink introduction needle 22 is supplied to the common ink chamber 44 side through the ink introduction path 23 and the case flow path 25.

  The actuator unit 20 supplies, for example, a plurality of piezoelectric vibrators 38 arranged in a comb shape, a fixed plate 39 that holds the piezoelectric vibrator 38, and a drive signal from the control device CONT to the piezoelectric vibrator 38. And a flexible cable 40.

  The piezoelectric vibrator 38 is fixed so that the lower end portion in the figure protrudes from the lower end surface of the fixed plate 39. Thus, each piezoelectric vibrator 38 is mounted on the fixed plate 39 in a so-called cantilever state. The fixed plate 39 that supports each piezoelectric vibrator 38 is made of, for example, stainless steel having a thickness of about 1 mm. For example, a surface different from the surface on which the piezoelectric vibrator 38 is fixed is bonded to the inner wall surface of the case that defines the hollow portion 37.

  The flow path unit 19 includes a vibration plate 41, a flow path substrate 42 and a nozzle substrate 43. The diaphragm 41, the flow path substrate 42, and the nozzle substrate 43 are bonded in a stacked state. The flow path unit 19 constitutes a series of ink flow paths from the common ink chamber 44 through the ink supply port 45 and the pressure chamber 46 to the nozzle NZ. The pressure chamber 46 is formed such that the direction perpendicular to the arrangement direction (nozzle row direction) of the nozzles NZ is the longitudinal direction.

  The common ink chamber 44 is connected to the case flow path 25. The common ink chamber 44 is a chamber into which the ink L from the ink introduction needle 22 side is introduced. The common ink chamber 44 is connected to the ink supply port 45. The ink L introduced into the common ink chamber 44 is distributed to each pressure chamber 46 through the ink supply port 45.

  The nozzle substrate 43 is disposed at the bottom of the flow path unit 19. A plurality of nozzles NZ are formed on the nozzle substrate 43 at a pitch (for example, 180 dpi) corresponding to the dot formation density of an image or the like formed on the medium M. As the nozzle substrate 43, for example, a metal plate material such as stainless steel is used.

  The liquid supply system LS1 provided in the liquid ejecting apparatus PRT according to the first embodiment includes a plurality of liquid supply channels TB and a plurality of pump mechanisms P1. A pump mechanism P1 is provided in each of the liquid supply channels TB.

  FIG. 4 is a diagram illustrating a liquid supply system LS1 including the pump mechanism P1. The liquid supply system LS1 has a configuration in which a liquid storage unit IS, a liquid jet head H, and a pump mechanism P1 provided between the liquid storage unit IS and the liquid jet head H are connected via a liquid supply channel TB. It is.

  The pump mechanism P1 includes a self-sealing valve 114, a pressure adjustment valve 116, a circulation channel TB2, and a tube pump P. The self-sealing valve 114 and the tube pump P are provided in this order from the liquid jet head H side. The pressure regulating valve 116 is connected on the inlet side between the self-sealing valve 114 and the tube pump P, and on the outlet side is connected to the circulation channel TB2 extending between the liquid reservoir IS and the tube pump P. .

  FIG. 5 is a diagram showing the configuration of the tube pump. As shown in FIG. 5, the tube pump P has a cylindrical case 123, and a rotor 124 having a circular shape in plan view is provided in the case 123. It is housed so as to be rotatable about a shaft 122. And in this case 123, the intermediate part 118a of the tube 118 is accommodated along the inner peripheral wall 123a of the case 123.

  The rotor 124 is formed with a pair of arcuate roller guide grooves 120b and 121b that bulge outward so as to face each other with the rotor rotation shaft 122 interposed therebetween. One end of each of the roller guide grooves 120 b and 121 b is located on the outer peripheral side of the rotor 124, and the other end is located on the inner peripheral side of the rotor 124. That is, both roller guide grooves 120b and 121b gradually extend away from the outer periphery of the rotor 124 as they go from one end to the other end. A pair of rollers 120 and 121 as pressing means are inserted into and supported by both roller guide grooves 120b and 121b via rotating shafts 120a and 121a, respectively. Both the rotating shafts 120a and 121a are slidable in the roller guide grooves 120b and 121b, respectively.

  When the rotor 124 is rotated in the forward direction (arrow direction), both rollers 120 and 121 move to one end side (the outer peripheral side of the rotor 124) of both roller guide grooves 120b and 121b, and the intermediate portion 118a of the tube 118 is moved. It rotates while crushing (pressing) sequentially from the upstream side to the downstream side. By this rotation, the inside of the tube 118 upstream from the tube pump P is depressurized, and the inside of the tube 118 downstream from the tube pump P is pressurized.

  Further, when the rotor 124 is rotated in the reverse direction (the direction opposite to the arrow direction), the rollers 120 and 121 move to the other end side (the inner peripheral side of the rotor 124) of the roller guide grooves 120b and 121b. It is like that. By this movement, both rollers 120 and 121 are in light contact with the intermediate portion 118a of the tube 118, respectively, and the reduced pressure state inside the upstream tube 118 is eliminated (the pressurized state inside the downstream tube 118). Is resolved).

  With the above configuration, in the tube pump P, a choke state can be created in the liquid supply channel TB by causing the rollers 120 and 121 to be engaged with the liquid supply channel TB. Therefore, since the choke member is unnecessary, the number of components is small compared to the configuration including the pump and the choke valve, and the cost can be reduced.

  Further, since the pressure state and the atmospheric pressure state can be switched only by changing the rotation direction of the rotor 124, the choke state can be easily switched.

  The self-sealing valve 114 is opened only when the ink in the liquid ejecting head H is consumed. For this reason, when the ink is filled in the liquid ejecting head H, no pressure is applied from the ink. Therefore, even if the amount of ink delivered from the tube pump P varies, the pressure applied to the ink in the liquid ejecting head H is kept constant. As a result, it is possible to suppress variations in the amount of ink delivered.

  Further, when the pressure of the accumulated ink exceeds a certain value between the self-sealing valve 114 and the tube pump P, the pressure adjustment valve 116 is opened, and the ink is circulated by the circulation flow path TB2. Therefore, even if the amount of ink delivered from the tube pump P varies, the pressure in the liquid supply channel TB is kept constant. As a result, it is possible to suppress variations in the amount of ink delivered.

  Moreover, precipitation of pigments or the like in the ink can be prevented by circulating the ink through the circulation channel TB2.

(Second embodiment)
2nd embodiment is the structure which changed the pump mechanism in 1st embodiment. In the liquid ejecting apparatus PRT according to the second embodiment, each of the liquid supply channels TB has a pump mechanism P2.

  FIG. 6 is a diagram illustrating a liquid supply system LS2 including the pump mechanism P2. The liquid supply system LS2 has a configuration in which a liquid storage unit IS, a liquid jet head H, and a pump mechanism P2 provided between the liquid storage unit IS and the liquid jet head H are connected via a liquid supply channel TB. It is.

  The pump mechanism P2 includes a self-sealing valve 114, a check valve 117, a circulation flow path TB3, and a tube pump P. The self-sealing valve 114 and the tube pump P are provided in this order from the liquid jet head H side. The pressure regulating valve 116 has an inlet side connected between the self-sealing valve 114 and the tube pump P, and an outlet side connected to a circulation channel TB3 extending between the liquid storage part IS and the tube pump P. The circulation channel TB3 has a resistance corresponding to a predetermined pressure, for example, by providing an orifice in the channel. The tube pump P has the same configuration as that of the first embodiment.

  With the above configuration, since the circulation flow path TB3 has a resistance corresponding to a predetermined pressure, leakage of ink to the circulation flow path TB3 can be prevented. Although the configuration is different from that of the first embodiment, since the pressure in the liquid supply channel TB can be made constant, the effect of suppressing variation in the liquid delivery amount can be obtained as in the first embodiment.

  Moreover, precipitation of pigments or the like in the ink can be prevented by circulating the ink through the circulation channel TB3.

  Further, the check valve 117 provided in the circulation channel TB3 prevents ink from flowing through the circulation channel TB3 when the ink is sucked from under the liquid jet head H during cleaning.

(Third embodiment)
FIG. 7 shows a liquid ejecting apparatus PRT2 according to the third embodiment of the present invention. The liquid ejecting apparatus PRT2 according to the third embodiment includes a plurality of liquid supply channels TB, and they share one pump mechanism P3. FIG. 8 is a diagram illustrating a liquid supply system LS3 including the pump mechanism P3. The liquid supply system LS3 includes a plurality of liquid supply channels TB that connect the liquid reservoir IS and the liquid jet head H, and each tube pump P of the plurality of liquid supply channels TB has a common rotor rotation shaft 122. . In addition, each component (self-sealing valve 114, pressure regulating valve 116, tube pump P, circulation channel TB2) provided in each of the liquid supply channels TB has the same configuration as in the first embodiment.

  With the above configuration, the tube pump P can be pressurized by rotating the rotor 124. However, since the rotor rotating shaft 122 is connected, the plurality of tube pumps P can be pressurized at the same timing. Thereby, it is possible to suppress variations in the amount of ink delivered when the pressure is applied.

  Further, the choke state can be released by rotating the rotor 124 in the reverse direction, but since the rotor rotating shaft 122 is connected, the release of the plurality of tube pumps P can be performed at the same timing. Thereby, it is possible to suppress variation in the amount of ink delivered when the release is performed.

  Further, since only one rotor rotating shaft 122 needs to be driven, the number of components can be reduced and the cost can be reduced as compared with the case where the tube pump P has the rotor rotating shaft 122 and the driving mechanism of the rotor rotating shaft 122. Can be lowered.

(Fourth embodiment)
4th embodiment is the structure which changed the pump mechanism in 3rd embodiment.
The liquid ejecting apparatus PRT2 according to the fourth embodiment includes a plurality of liquid supply channels TB, and they share one pump mechanism P4. FIG. 9 is a diagram showing a liquid supply system LS4 provided with a pump mechanism P4. The liquid supply system LS4 includes a plurality of liquid supply channels TB that connect the liquid reservoir IS and the liquid jet head H, and each tube pump P of the plurality of liquid supply channels TB has a common rotor rotation shaft 122. . Each component (self-sealing valve 114, check valve 117, tube pump P, circulation channel TB3) provided in each of the liquid supply channels TB has the same configuration as in the second embodiment. Furthermore, by the same operation as that of the third embodiment, it is possible to suppress variations in the amount of ink delivered when the pump is released, and to reduce the cost.

  In addition, although preferred embodiment which concerns on this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the spirit of the present invention.

PRT ... Liquid ejecting device, PRT2 ... Liquid ejecting device, IS ... Liquid reservoir,
H: Liquid jet head, TB: Liquid supply flow path, TB2: Circulation flow path,
TB3 ... circulation flow path, P ... tube pump, 114 ... self-sealing valve,
116: Pressure regulating valve, 117: Check valve, 118: Tube,
122... Rotor rotating shaft, 124.

Claims (4)

In the liquid supply flow path connecting the liquid reservoir and the liquid jet head,
A self-sealing valve and a tube pump connected in order from the liquid jet head side;
A pressure regulating valve connected on the inlet side between the self-sealing valve and the tube pump;
From the outlet side of the pressure regulating valve, a circulation channel extending between the liquid reservoir and the tube pump;
A liquid ejecting apparatus comprising: In the liquid supply flow path connecting the liquid reservoir and the liquid jet head,
A self-sealing valve and a tube pump connected in order from the liquid jet head side;
A check valve connected on the outlet side between the liquid reservoir and the tube pump;
A circulation flow path having a resistance corresponding to a predetermined pressure extending from the inlet side of the check valve between the self-sealing valve and the tube pump;
A liquid ejecting apparatus comprising: The liquid ejecting apparatus according to claim 1 or 2,
The tube pump is
A tube for discharging the liquid sucked from one end from the other end;
A rotor that pressurizes the tube in one rotational direction and releases the pressurized state of the tube in the other rotational direction;
A liquid ejecting apparatus comprising: The liquid ejecting apparatus according to any one of claims 1 to 3,
A plurality of the liquid supply flow paths;
The liquid ejecting apparatus according to claim 1, wherein each of the plurality of liquid supply passages has a common rotor rotation shaft.

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