WO2024252854A1 - 液体供給ユニットおよびこれを備えた記録装置、液体供給ユニットの取付方法 - Google Patents
液体供給ユニットおよびこれを備えた記録装置、液体供給ユニットの取付方法 Download PDFInfo
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- WO2024252854A1 WO2024252854A1 PCT/JP2024/017596 JP2024017596W WO2024252854A1 WO 2024252854 A1 WO2024252854 A1 WO 2024252854A1 JP 2024017596 W JP2024017596 W JP 2024017596W WO 2024252854 A1 WO2024252854 A1 WO 2024252854A1
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- Prior art keywords
- tank
- liquid
- supply
- ink
- supply unit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/18—Ink recirculation systems
Definitions
- This disclosure relates to a liquid supply unit, a recording device equipped with the same, and a method for installing the liquid supply unit.
- Patent Document 1 discloses an inkjet recording device that prints on a medium using ink.
- the inkjet recording device is equipped with a supply tank that contains ink, a recording head that ejects the ink supplied from the supply tank, and a recovery tank that contains ink recovered from the recording head.
- the supply tank and recovery tank are independently detachable from a box-shaped ink tank guide.
- a liquid supply unit includes a supply tank that contains liquid to be supplied to a supply destination, a recovery tank that contains the liquid recovered from the supply destination, and a support that supports the supply tank and the recovery tank and is removably attached to an apparatus body that includes the supply destination.
- a recording device includes the liquid supply unit described above and an ejection head that receives the liquid as the supply destination and ejects the liquid onto a recording medium.
- a method for mounting a liquid supply unit is a method for mounting a liquid supply unit having a supply tank and a recovery tank, each capable of containing liquid, to an apparatus body including a supply destination.
- the mounting method includes mounting the supply tank and the recovery tank to a support, and mounting the support, on which the supply tank and the recovery tank are mounted, to the apparatus body so that the liquid can be supplied from the supply tank to the supply destination and the liquid can be recovered from the supply destination to the recovery tank.
- FIG. 1 is a perspective view showing the overall configuration of a recording apparatus according to an embodiment of the present disclosure.
- FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG.
- FIG. 3 is an enlarged perspective view of the carriage shown in FIG.
- FIG. 4 is a schematic diagram showing the flow of ink around an ink head according to an embodiment of the present disclosure.
- FIG. 5 is a schematic diagram showing a supply sub-tank and a recovery sub-tank according to an embodiment of the present disclosure.
- FIG. 6 is a perspective view of a tank unit according to one embodiment of the present disclosure.
- FIG. 7 is a perspective view of a tank unit according to one embodiment of the present disclosure, seen from the opposite side to FIG. 6 .
- FIG. 8 is a perspective view showing a state in which a plurality of tank units are attached to a carriage according to an embodiment of the present disclosure.
- FIG. 9 is a perspective view of the heater of the tank unit according to the present embodiment.
- FIG. 10 is an exploded perspective view of the heater of the tank unit according to the present embodiment.
- an inkjet printer equipped with an ink head that ejects ink for forming an image onto a wide, long recording medium will be exemplified as a specific example of a recording device.
- Inkjet printers are suitable for digital textile printing, which uses an inkjet method to print images such as letters and patterns onto a recording medium made of fabric such as woven or knitted fabric.
- the recording device according to the present disclosure can also be used to print various images onto recording media such as paper sheets and resin sheets.
- FIG. 1 is a perspective view showing the overall configuration of an inkjet printer 1 according to an embodiment of the present disclosure
- FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 1.
- the inkjet printer 1 is a printer that prints images on a wide and long workpiece W (recording medium, target object) using an inkjet method. As an example, the width of the workpiece W is several meters.
- the printer 1 includes an apparatus frame 10, and a work transport section 20 and a carriage 3 (apparatus main body) that are incorporated into the apparatus frame 10.
- the left-right direction is the main scanning direction S ( FIG. 3 ) when printing on the workpiece W
- the direction from the rear to the front is the sub-scanning direction (the transport direction F of the workpiece W, which is a direction that intersects with the main scanning direction S).
- the device frame 10 forms a framework for mounting various components of the inkjet printer 1.
- the work transport unit 20 is a mechanism that intermittently feeds (transports) the work W so that the work W progresses in a transport direction F from rear to front in the printing area where the inkjet printing process is performed.
- the carriage 3 is equipped with an ink head 4, a pre-treatment liquid head 5, a post-treatment liquid head 6, and a sub-tank 7, and moves back and forth in a main scanning direction S (left-right direction) that intersects with the transport direction F of the work W during the inkjet printing process.
- the device frame 10 includes a central frame 111, a right frame 112, and a left frame 113.
- the central frame 111 forms a framework for mounting various components of the inkjet printer 1, and has a left-right width corresponding to the work transport section 20.
- the right frame 112 and the left frame 113 are erected to the right and left of the central frame 111, respectively. Between the right frame 112 and the left frame 113 is the printing area 12 where printing processing is performed on the work W.
- the right frame 112 forms the maintenance area 13.
- the maintenance area 13 is an area where the carriage 3 is retracted when the printing process is not being performed.
- cleaning processes, purging processes, etc. are performed on the nozzles (ejection holes) of the ink head 4, pre-treatment liquid head 5, and post-treatment liquid head 6, and each nozzle is fitted with a cap.
- the left frame 113 forms the turn-around area 14 for the carriage 3.
- the turn-around area 14 is an area where the carriage 3 temporarily enters when it performs a main scan in the opposite direction after performing a main scan in the opposite direction from right to left in the printing process.
- a carriage guide 15 is attached to the upper side of the device frame 10 to allow the carriage 3 to move back and forth in the left-right direction.
- the carriage guide 15 is a flat member that is long in the left-right direction, and is disposed above the work transport section 20.
- a timing belt 16 is attached to the carriage guide 15 so that it can move in a circular motion in the left-right direction (main scanning direction).
- the timing belt 16 is an endless belt that is driven to move in a circular motion in the left or right direction.
- the carriage guide 15 is equipped with a pair of upper and lower guide rails 17 that extend parallel to the left and right and that hold the carriage 3 in a state in which it can move back and forth in the main scanning direction S.
- the carriage 3 engages with the guide rails 17.
- the carriage 3 is also fixed to a timing belt 16. As the timing belt 16 moves orbitally to the left or right, the carriage 3 moves left or right along the carriage guide 15 while being guided by the guide rails 17.
- the work transport section 20 includes a feed roller 21 that pays out the work W before printing, and a take-up roller 22 that takes up the work W after printing.
- the feed roller 21 is located at the rear lower part of the device frame 10, and is a take-up shaft for the feed roll WA, which is a wound body of the work W before printing.
- the take-up roller 22 is located at the front lower part of the device frame 10, and is a take-up shaft for the take-up roll WB, which is a wound body of the work W after the printing process.
- a first motor M1 is attached to the take-up roller 22, which drives the take-up roller 22 to rotate around its axis and perform the winding operation of the work W.
- the path between the delivery roller 21 and the take-up roller 22 and passing through the printing area 12 is the transport path for the work W.
- a first tension roller 23 applies a predetermined tension to the work W on the upstream side of the transport roller 25.
- the work guide 24 changes the transport direction of the work W from upward to forward, allowing the work W to enter the printing area 12.
- the transport roller 25 is a roller that generates a transport force that intermittently feeds the workpiece W in the printing area 12.
- the transport roller 25 is driven to rotate about its axis by the second motor M2, and intermittently transports the workpiece W forward (predetermined transport direction F) so that the workpiece W passes through the printing area 12 (image forming position) facing the carriage 3.
- the pinch roller 26 is disposed to face the transport roller 25 from above, and forms a transport nip portion with the transport roller 25.
- the turn-back roller 27 changes the transport direction of the work W that has passed through the printing area 12 from the forward direction to the downward direction, and guides the work W after the printing process to the take-up roller 22.
- the second tension roller 28 applies a predetermined tension to the work W downstream of the transport roller 25.
- a platen 29 is disposed below the transport path of the work W in the printing area 12.
- the carriage 3 is supported at one end by the guide rail 17 and moves back and forth in the main scanning direction S (left and right in this embodiment) that intersects (orthogonal in this embodiment) with the transport direction F.
- the carriage 3 comprises a carriage frame 30, and an ink head 4, a pre-treatment liquid head 5, a post-treatment liquid head 6, and a sub-tank 7 ( Figure 3) that are mounted on the carriage frame 30.
- the carriage frame 30 includes a head support frame 31 and a back frame 32.
- the head support frame 31 is a horizontal plate that holds the heads 4 to 6 described above.
- the back frame 32 is a vertical plate that extends upward from the rear edge of the head support frame 31. As described above, the timing belt 16 is fixed to the back frame 32.
- the guide rail 17 is engaged with the back frame 32. That is, in this embodiment, the back frame 32 is an engagement portion that holds the guide rail 17 in a cantilevered state.
- the head support frame 31 is a horizontal plate whose rear end side is supported in a cantilevered state on the guide rail 17 by the engagement portion.
- the cantilevered state refers to a state in which the engagement portion (back frame 32), which is the portion of the carriage 3 that is held by the guide rail 17, which is a holding member, is present only on one side, either upstream or downstream, from the center of the carriage 3 in the transport direction F, and no other engagement portion is present on the opposite side to the side where the engagement portion is present.
- the engagement portion may also be located outside the range in which the ink head 4 and processing head are located in the transport direction F. In other words, the engagement portion may be located only upstream or only downstream of the range in which the ink head 4 and processing head are located in the transport direction F.
- Fig. 3 is an enlarged perspective view of the carriage 3 shown in Fig. 1.
- Fig. 3 shows a transport direction F (sub-scanning direction) of the work W and a main scanning direction S which is a moving direction of the carriage 3.
- Fig. 3 shows an example in which a plurality of ink heads 4 which eject ink for forming an image onto the work W, a pre-treatment liquid head 5 and a post-treatment liquid head 6 which eject a non-coloring treatment liquid, and a plurality of sub-tanks 7 which supply the ink and the treatment liquid to these heads 4 to 6 are mounted on the carriage 3.
- Each of the ink heads 4 has a number of nozzles (ink ejection holes) that eject ink droplets by an ejection method such as a piezoelectric method using a piezoelectric element or a thermal method using a heating element, and an ink passage that guides the ink to the nozzles.
- nozzles ink ejection holes
- an ejection method such as a piezoelectric method using a piezoelectric element or a thermal method using a heating element
- an ink passage that guides the ink to the nozzles.
- a water-based pigment ink containing a water-based solvent, pigment, and binding resin (binder) can be used as the ink.
- the multiple ink heads 4 in this embodiment are capable of ejecting eight colors of ink.
- the ink heads 4 are mounted on the head support frame 31 ( Figure 2) of the carriage 3 so as to be aligned in two rows in the main scanning direction S. Each color ink head 4 has two heads.
- the ink heads 4 have a first upstream ink head 41A and a first downstream ink head 41B. These ink heads 4 eject yellow ink.
- the ink heads 4 also have a second upstream ink head 42A and a second downstream ink head 42B. These ink heads 4 eject magenta ink.
- two ink heads 4 ejecting the same color ink are arranged at positions offset from each other in the transport direction F and the main scanning direction S. These two ink heads 4 are considered as one set, and a total of eight sets of ink heads 4 (41A-48A, 41B-48B) eject inks of different colors (different liquids).
- different liquids include cases where the types of liquids are different, as well as cases where the same type of liquid has independent flow paths.
- the pre-treatment liquid head 5 and the post-treatment liquid head 6 are disposed at positions different from the ink head 4 in the transport direction F.
- the pre-treatment liquid head 5 is disposed upstream of the ink head 4 in the transport direction F.
- FIG. 3 shows an example in which one pre-treatment liquid head 5 is disposed near the left end of the array of ink heads 4.
- the post-treatment liquid head 6 is disposed downstream of the ink head 4 in the transport direction F.
- FIG. 3 shows an example in which one post-treatment liquid head 6 is disposed at the right end of the array of ink heads 4.
- multiple pre-treatment liquid heads 5 or multiple post-treatment liquid heads 6 may be disposed. It is desirable that the carriage 3 is provided with at least one pre-treatment liquid head 5 and at least one post-treatment liquid head 6, but in other embodiments, the pre-treatment liquid head 5 and the post-treatment liquid head 6 may not be disposed.
- the series of heads arranged along the main scanning direction S, which is made up of the ink heads 4, pretreatment liquid heads 5, and posttreatment liquid heads 6, is referred to as a row of heads, or simply as a row.
- the series of heads arranged along the transport direction F, which is made up of the ink heads 4, pretreatment liquid heads 5, and posttreatment liquid heads 6, is referred to as a row of heads, or simply as a row.
- the pretreatment liquid head 5 ejects pretreatment liquid for performing a predetermined pretreatment on the workpiece W.
- the pretreatment liquid is ejected from the ink head 4 onto a position on the workpiece W where ink has not yet been ejected from the ink head 4.
- the pretreatment liquid is a non-coloring treatment liquid that does not develop color even when it adheres to the workpiece W, and is a treatment liquid that exhibits functions such as increasing the fixation of ink to the workpiece W and the coagulation of ink pigments.
- a treatment liquid in which a binder resin is mixed into a solvent, or a treatment liquid in which a positively charged cationic resin is mixed into a solvent can be used.
- the post-treatment liquid head 6 ejects post-treatment liquid for performing a predetermined post-treatment on the workpiece W to which ink has been attached.
- the post-treatment liquid is ejected from the post-treatment liquid head 6 to a position on the workpiece W after the ink has been ejected from the ink head 4.
- the post-treatment liquid is a non-coloring treatment liquid that does not develop color even when it adheres to the workpiece W, and has the function of increasing the fixation and robustness (resistance to rubbing and scraping) of the ink image printed on the workpiece W by the ink head 4.
- a silicone-based treatment liquid or the like can be used as such a post-treatment liquid.
- the post-treatment liquid and the pre-treatment liquid are different treatment liquids. Specifically, the post-treatment liquid and the pre-treatment liquid contain different components.
- non-color-forming processing liquid refers to a liquid that, when printed alone on a recording medium, is not recognized as having color by the naked eye.
- Colors here include colors with a saturation of zero, such as black, white, and gray.
- Non-color-forming processing liquids are basically transparent liquids, but for example, when looking at 1 liter of processing liquid in liquid form, it is not completely transparent and may appear slightly white. Such colors are very light, so when printed alone on a recording medium, it is not recognized as having color by the naked eye. Note that, depending on the type of processing liquid, when printed alone on a recording medium, changes such as the appearance of gloss on the recording medium may occur, but this state is not color-forming.
- the pre-treatment liquid and the post-treatment liquid may be ejected onto substantially the entire surface of the workpiece W, or the pre-treatment liquid and the post-treatment liquid may be ejected selectively in accordance with the image to be printed, similar to ink.
- the pretreatment liquid, ink, and posttreatment liquid are ejected in that order onto the workpiece W in the areas where colors are to be printed in accordance with the image.
- the ink may be of one color or multiple colors.
- the pretreatment liquid and posttreatment liquid are basically not ejected either. Note that in order to adjust the image quality of the printed image and the texture of the workpiece W, the selection of the ejection of the pretreatment liquid and posttreatment liquid may be made to differ from the ejection of the ink.
- openings 31H are provided at the locations of the heads on the head support frame 31.
- the ink head 4, pre-treatment liquid head 5, and post-treatment liquid head 6 are attached to the head support frame 31 so that they fit into the respective openings 31H.
- Nozzles arranged on the bottom end surface of each of the heads 4, 5, and 6 are exposed from each opening 31H.
- the multiple subtanks 7 are supported by the carriage 3 above the heads 4, 5, and 6 via a frame 70F (Figs. 6 and 7) described below.
- the multiple subtanks 7 are provided corresponding to each of the heads 4, 5, and 6.
- Ink or treatment liquid is supplied to each subtank 7 from a main tank 91 and an intermediate tank 94 (described below) which contain ink and treatment liquid, and these are supplied to each of the heads 4, 5, and 6.
- Each subtank 7 and the heads 4, 5, and 6 are connected by pipelines not shown in Fig. 3.
- the multiple subtanks 7 include a first supply subtank 71A to an eighth supply subtank 78A, a pre-treatment supply subtank 7FA, and a post-treatment supply subtank 7RA.
- the multiple subtanks 7 include a first recovery subtank 71B to an eighth recovery subtank 78B, a pre-treatment recovery subtank 7FB, and a post-treatment recovery subtank 7RB. Note that in Figure 3, for the sake of explanation, the supply subtank and recovery subtank are shown as simple boxes, but their actual structure, shape, etc. will be described in detail later.
- the first supply subtank 71A (supply tank) and the first recovery subtank 71B (recovery tank) store yellow ink containing a pigment.
- the first supply subtank 71A stores yellow ink (liquid) to be supplied to the first upstream ink head 41A and the first downstream ink head 41B (both of which are also referred to as ejection heads and supply destinations).
- the first recovery subtank 71B stores yellow ink recovered from the first upstream ink head 41A and the first downstream ink head 41B. As mentioned above, some of the yellow ink is ejected from the first upstream ink head 41A and the first downstream ink head 41B toward the workpiece W.
- the second supply subtank 72A stores magenta ink to be supplied to the second upstream ink head 42A and the second downstream ink head 42B.
- the second recovery subtank 72B stores magenta ink recovered from the second upstream ink head 42A and the second downstream ink head 42B.
- Each of the other sub-tanks, from the third sub-tank to the eighth sub-tank, has the same structure and function as described above.
- the pre-treatment supply sub-tank 7FA contains the pre-treatment liquid supplied to the pre-treatment liquid head 5
- the pre-treatment recovery sub-tank 7FB contains the pre-treatment liquid recovered from the pre-treatment liquid head 5.
- the post-treatment supply sub-tank 7RA contains the post-treatment liquid supplied to the post-treatment liquid head 6
- the post-treatment recovery sub-tank 7RB contains the post-treatment liquid recovered from the post-treatment liquid head 6.
- the inkjet printer 1 is an all-in-one printer in which three types of heads - the ink head 4, the pretreatment liquid head 5, and the posttreatment liquid head 6 - are mounted on a single carriage 3.
- the process of ejecting the pretreatment liquid and the process of ejecting the posttreatment liquid can be carried out integrally in the printing process in which inkjet printing is performed on fabric. This makes it possible to simplify the textile printing process and make the textile printing device more compact. Furthermore, by mounting the subtank 7 on the carriage 3, the device can be made even more compact.
- the inkjet printer 1 uses a serial printing method to print on the workpiece W. Specifically, if the workpiece W is wide, it is not possible to print on the workpiece W while continuously feeding it.
- the serial printing method is a printing method that repeats the reciprocating movement of a carriage 3 carrying ink heads 4 of each color in the main scanning direction S and the intermittent feeding of the workpiece W in the transport direction F.
- the strip image is printed while the carriage 3 moves in the forward direction, which is one of the main scanning directions S.
- the feeding of the workpiece W is stopped.
- the workpiece W is sent out in the transport direction F by a predetermined pitch.
- the carriage 3 waits in the turn-back area 14 on the left end side.
- the carriage 3 turns back in the return direction, which is opposite to the forward direction, as the timing belt 16 moves in reverse.
- the workpiece W is in a stopped state.
- the carriage 3 prints the next strip image upstream of the strip image. Similar operations are repeated thereafter.
- Fig. 4 is a schematic diagram showing the flow of ink around the first upstream ink head 41A and the first downstream ink head 41B according to this embodiment.
- Fig. 5 is a schematic diagram showing a supply sub-tank and a recovery sub-tank according to this embodiment. Note that in each figure, the lines connecting members indicate pipes (tubes) through which gas or liquid flows.
- pressure is applied via gas (air) to each of the first supply sub-tank 71A to post-treatment supply sub-tank 7RA (each also referred to as a supply tank) and the first recovery sub-tank 71B to post-treatment recovery sub-tank 7RB (each also referred to as a recovery tank) mounted on the carriage 3 in FIG. 3.
- liquid ink, pre-treatment liquid, post-treatment liquid
- ink head 4 pre-treatment liquid head 5 and post-treatment liquid head 6
- each liquid is recovered from each head to each recovery sub-tank.
- Each liquid recovered in the recovery sub-tank is supplied to the supply sub-tank. In other words, a circulation path for each liquid is formed.
- the inkjet printer 1 further includes filters 81, 82, 83, and 84 arranged on the carriage 3, a circulation pump 85 (pump), a filter 86, a degasser 87, a supply solenoid valve 88, and a recovery solenoid valve 89.
- the inkjet printer 1 also includes a main tank 91 arranged on the device frame 10 (FIG. 1) outside the carriage 3, a main tank solenoid valve 92, a main supply pump 93, an intermediate tank 94, an intermediate tank solenoid valve 95, an intermediate tank pump 96, a sensor 97, and a control unit 100.
- the yellow ink that flows from the first supply subtank 71A into the ink supply path QA through the supply solenoid valve 88 is divided into a first ink path Q1 that passes through the first upstream ink head 41A and a second ink path Q2 that passes through the first downstream ink head 41B.
- a first supply pipe 711, a second supply pipe 712, a first recovery pipe 713, and a second recovery pipe 714 are connected to the first upstream ink head 41A and the first downstream ink head 41B, respectively (see Figures 6 and 7).
- the filter 81 is disposed upstream of the first upstream ink head 41A, and the filter 82 is disposed upstream of the first downstream ink head 41B.
- the filter 83 is disposed downstream of the first upstream ink head 41A, and the filter 84 is disposed downstream of the first downstream ink head 41B.
- These filters have the function of removing foreign matter, dust, etc. from the ink.
- this circulation pump 85 constitutes part of the circulation flow path Q for yellow ink that flows from the first supply subtank 71A via the first upstream ink head 41A and the first downstream ink head 41B, and the first recovery subtank 71B, and returns to the first supply subtank 71A.
- the circulation pump 85 is disposed in the ink return path Q3 in order to eject yellow ink from the first recovery subtank 71B to the first supply subtank 71A.
- the filter 86 is disposed in the ink return path Q3 and collects and removes foreign matter from the ink supplied from the first recovery sub-tank 71B to the first supply sub-tank 71A.
- the degasser 87 has the function of degassing the ink flowing through the ink return path Q3 (removing air bubbles).
- the heater 70H heats the ink flowing through the ink return path Q3 before the ink is supplied to the first supply sub-tank 71A.
- the detailed structure of the heater 70H will be described later.
- the supply solenoid valve 88 and the recovery solenoid valve 89 are opened to open the ink supply path QA and the ink recovery path QB, respectively.
- the main tank 91 is mounted on the device frame 10 of the inkjet printer 1 and stores yellow ink. Similar main tanks 91 are provided for the other colors.
- the main tank solenoid valve 92 opens to switch between opening and closing the flow path from the main tank 91 to the intermediate tank 94.
- the main supply pump 93 operates to supply ink from the main tank 91 to the intermediate tank 94.
- the intermediate tank 94 stores the yellow ink supplied from the main tank 91.
- the intermediate tank solenoid valve 95 opens to switch between opening and closing the ink refill path Q4 that joins the intermediate tank 94 to the ink return path Q3.
- the intermediate tank pump 96 operates to supply the ink from the intermediate tank 94 to the first supply sub-tank 71A.
- the sensor 97 detects the remaining amount of yellow ink in the intermediate tank 94.
- the main supply pump 93 operates to supply ink from the main tank 91 to the intermediate tank 94.
- the intermediate tank pump 96 supplies the ink from the intermediate tank 94 to the first supply sub-tank 71A according to the detection results of the capacitance sensors 71A1 and 71B1 described below.
- the control unit 100 controls the overall operation of the inkjet printer 1, and electrically controls each of the components shown in FIG. 4.
- the first supply subtank 71A has a box-shaped tank body 710A, and when yellow ink (liquid) is contained therein, a supply tank gas area SA and a supply tank ink area SB are formed.
- the supply tank gas area SA is a space above the liquid level L1 of the yellow ink in the first supply subtank 71A, and the supply tank ink area SB is an area formed by the yellow ink.
- the supply tank gas area SA is connected to the supply side pressure supply path P11.
- the supply side pressure supply path P11 is connected to the first pressure source P1, and adjusts and maintains the supply tank gas area SA of the first supply subtank 71A at a predetermined pressure.
- a supply air pressure connection coupling 751, described below, is arranged in the supply side pressure supply path P11.
- the supply tank ink area SB is connected to the ink supply path QA (first ink path Q1, second ink path Q2), the ink return path Q3, and the ink refill path Q4.
- the first supply sub-tank 71A also has a capacitance sensor 71A1 that can detect the liquid level (ink amount) of the yellow ink in the first supply sub-tank 71A.
- the first recovery subtank 71B has a box-shaped tank body 710B, and when yellow ink is stored therein, a recovery tank gas area SC and a recovery tank ink area SD are formed.
- the recovery tank gas area SC is a space above the liquid level L2 of the yellow ink in the first recovery subtank 71B, and the recovery tank ink area SD is an area formed by the yellow ink.
- the recovery tank gas area SC is connected to the recovery side pressure supply path P12.
- the recovery side pressure supply path P12 is connected to the second pressure source P2, and adjusts and maintains the recovery tank gas area SC of the first recovery subtank 71B at a predetermined pressure.
- a recovery air pressure connection coupling 752 which will be described later, is disposed in the recovery side pressure supply path P12.
- the recovery tank ink area SD is connected to the ink recovery path QB (first ink path Q1, second ink path Q2) and the ink return path Q3.
- the first collection sub-tank 71B also has a capacitance sensor 71B1 capable of detecting the yellow ink in the first collection sub-tank 71B, and a capacitance sensor 71B2 capable of detecting bubbles in the ink above the liquid level L2 of the yellow ink.
- the ink bubbles correspond to foam or multiple bubbles. Note that what the capacitance sensor 71B2 actually detects by capacitance is not the gas in the bubbles, but a minute amount of ink (liquid) that makes up the film of multiple bubbles.
- the supply tank gas area SA of the first supply sub-tank 71A is maintained at, for example, +2 kPa
- the recovery tank gas area SC of the first recovery sub-tank 71B is maintained at, for example, -15 kPa.
- the tank body 710B of the first recovery sub-tank 71B is set to a negative pressure relative to the first upstream ink head 41A and the first downstream ink head 41B.
- a flow of yellow ink is formed from the first supply sub-tank 71A in FIG. 4 through the ink supply path QA (first ink path Q1, second ink path Q2), each ink head, and the ink recovery path QB (first ink path Q1, second ink path Q2) to the first recovery sub-tank 71B.
- Both the supply tank gas area SA and the recovery tank gas area SC may be held at a positive pressure greater than 0 kPa.
- both the supply tank gas area SA and the recovery tank gas area SC may be held at a negative pressure less than 0 kPa.
- the pressure difference between the supply tank gas area SA and the recovery tank gas area SC may be 5 to 20 kPa. In either case, it is sufficient that the first recovery sub-tank 71B is at a more negative pressure than each ink head.
- the control unit 100 When the capacitance sensor 71B1 (FIG. 5) detects the ink level L2 in the first recovery subtank 71B, the control unit 100 operates the circulation pump 85. As a result, a portion of the yellow ink in the first recovery subtank 71B is supplied to the first supply subtank 71A through the ink return path Q3.
- the circulation pump 85 operates whether the inkjet printer 1 is in the middle of a printing operation or not.
- control unit 100 determines based on the detection results of the capacitance sensors 71A1 and 71B1 that the amount of yellow ink in both the first supply subtank 71A and the first recovery subtank 71B falls below a preset threshold
- the control unit 100 opens the intermediate tank solenoid valve 95 and operates the intermediate tank pump 96 to replenish yellow ink from the intermediate tank 94 to the first supply subtank 71A through the ink replenishment path Q4 and the ink return path Q3.
- the intermediate tank solenoid valve 95 opens to adjust the maximum replenishment amount (replenishment speed) for the first supply subtank 71A.
- control unit 100 opens the main tank solenoid valve 92 and operates the main supply pump 93 to replenish yellow ink from the main tank 91 to the intermediate tank 94.
- FIG. 6 is a perspective view of a tank unit 70 (liquid supply unit) according to this embodiment.
- Figure 7 is a perspective view of the tank unit 70, seen from the opposite side to that of Figure 6.
- Figure 8 is a perspective view showing a state in which multiple tank units 70 are attached to the carriage 3 according to this embodiment. Note that illustration of each head is omitted in Figure 8.
- the tank unit 70 includes a first supply sub-tank 71A and a first recovery sub-tank 71B, and is a unit that can be attached to and detached from the carriage 3 of the inkjet printer 1.
- a tank unit 70 is provided for each color of ink, pre-treatment liquid, and post-treatment liquid.
- the tank unit 70 has a first supply sub-tank 71A, a first recovery sub-tank 71B, a frame 70F (support) that supports these, the heater 70H mentioned above, a circulation pump 85, a filter 86, a degasser 87, a supply solenoid valve 88, and a recovery solenoid valve 89.
- the tank unit 70 does not necessarily have to include all of these components.
- the frame 70F supports the first supply sub-tank 71A and the first recovery sub-tank 71B, and is removably attached to the carriage 3 (device body) which includes the first upstream ink head 41A and the first downstream ink head 41B.
- the frame 70F has a frame horizontal portion 70F1 (first support portion) and a frame back portion 70F2 (second support portion).
- the frame horizontal portion 70F1 is a plate-shaped portion that has a predetermined width in the left-right direction and extends in the front-rear direction (horizontal direction).
- the frame horizontal portion 70F1 supports the first supply sub-tank 71A and the first recovery sub-tank 71B.
- the first supply sub-tank 71A and the first recovery sub-tank 71B are supported by the frame 70F so as to be suspended (hanging down) from the frame horizontal portion 70F1 of the frame 70F.
- the frame back portion 70F2 is a support portion different from the frame horizontal portion 70F1 and is fixed to the back frame 32 of the carriage 3.
- the frame back portion 70F2 is positioned so as to extend upward (vertically) from the rear end portion of the frame horizontal portion 70F1.
- the structure of the tank unit 70 makes it possible to position the support structures for the first supply sub-tank 71A and the first recovery sub-tank 71B in the upper portion of each sub-tank. This ensures space below the tank unit 70, allowing the first supply pipe 711 and second supply pipe 712 (supply pipes) and the first recovery pipe 713 and second recovery pipe 714 (recovery pipes) for supplying and recovering ink to each ink head to be positioned with a high degree of freedom.
- the structure of the tank unit 70 as described above allows stable supply and recovery of ink to each head located below each sub-tank within the carriage 3, while also making effective use of the space within the carriage 3 and making the size of the carriage 3 compact.
- a connector 750 is provided to supply power to the tank unit 70 and input and output various signals.
- the supply air pressure connection coupling 751 is connected to a first pressure source P1 to set the supply tank gas area SA (Fig. 5) of the first supply subtank 71A to a predetermined pressure.
- the recovery air pressure connection coupling 752 is connected to a second pressure source P2 to set the recovery tank gas area SC (Fig. 5) of the first recovery subtank 71B to a predetermined pressure.
- the first pressure source P1 and the second pressure source P2 may share the same pressure source, and each pressure supply path may be switched by an opening and closing valve or the like.
- the degasser vacuum pressure connection coupling 753 is connected to a pressure path for vacuuming the degasser 87.
- the ink connection coupling 754 is connected to the ink refill path Q4 in FIG. 4.
- communication holes P1H and P2H are formed on the top surfaces of the tank bodies 710A and 710B, respectively.
- the communication holes P1H and P2H are located above the ink liquid level in the tank bodies 710A and 710B.
- the communication holes P1H and P2H are respectively connected to the supply air pressure connection coupling 751 and the recovery air pressure connection coupling 752 by tubes not shown.
- the insides of the tank bodies 710A and 710B are respectively connected to the first pressure source P1 and the second pressure source P2 (FIG. 5) via the communication holes P1H and P2H, the supply air pressure connection coupling 751, and the recovery air pressure connection coupling 752.
- the frame 70F that supports the first supply sub-tank 71A and the first recovery sub-tank 71B is supported in a cantilever manner on the back frame 32 (FIG. 2) of the carriage 3.
- the frame back portion 70F2 of the frame 70F has a plurality of screw holes 70F3, 70F4 (fixing portions) that are fixed to the back frame 32.
- a pair of screws 32H1 are attached to the back frame 32 of the carriage 3 corresponding to each tank unit 70, and a pair of screws 32H2 are attached to both outer sides of the screws 32H1.
- Each screw is well known and includes a threaded portion and a head, and when the tank unit 70 is attached to the carriage 3, at least the head of the screw 32H2 is attached to the back frame 32 in a state separated (floating) from the wall surface of the back frame 32 (wall portion).
- each screw hole (fitting hole) formed in the frame back 70F2 of the frame 70F has a keyhole shape with a narrow upper side.
- each screw hole includes a small diameter portion having an inner diameter corresponding to the threaded portion of the screw, and a large diameter portion located below the small diameter portion and having an inner diameter corresponding to the head of the screw.
- the worker When attaching the tank unit 70 to the back frame 32, the worker first moves the tank unit 70 closer to the back frame 32 along the attachment direction DS as shown by the arrow in Figure 8. The tank unit 70 is then positioned so that the head enters the large diameter portion of the fitting hole. The worker then moves the tank unit 70 downward so that the small diameter portion of the fitting hole in the back frame 32 fits into the threaded portion of the screw. After that, the worker tightens the pair of screws 32H2 to secure the tank unit 70 to the back frame 32. Note that the pair of screws 32H1 are intended to prevent the tank unit 70 from falling off when attached, and do not necessarily need to be tightened tightly.
- the frame back 70F2 has a protrusion 70F5 (rotation restriction portion) arranged at a distance below the screw hole ( Figure 6).
- This protrusion 70F5 is inserted into a hole (not shown) formed in the back frame 32 of the carriage 3 when the tank unit 70 is attached.
- the rotation of the frame 70F relative to the carriage 3 is restricted.
- the frame back 70F2 is fixed by a pair of left and right screws 32H2, the rotation is further restricted.
- the frame 70F of the tank unit 70 supports the first supply sub-tank 71A and the first recovery sub-tank 71B, and is removably attached to the carriage 3.
- the tank unit 70 can be easily attached to the carriage 3, and can supply ink to the first upstream ink head 41A and the first downstream ink head 41B and collect ink from these heads.
- first supply pipe 711 and the second supply pipe 712 in Figures 6 and 7 communicate with the first supply sub-tank 71A so that ink can flow, and can be connected to the first upstream ink head 41A and the first downstream ink head 41B when the frame 70F is attached to the carriage 3.
- first recovery pipe 713 and the second recovery pipe 714 communicate with the first recovery sub-tank 71B so that ink can flow, and can be connected to the first upstream ink head 41A and the first downstream ink head 41B when the frame 70F is attached to the carriage 3.
- the supply tank and recovery tank are detachable from the device main body, but an ink flow path is formed in the ink tank guide, and ink is supplied and recovered between the supply tank and recovery tank and the recording head through the ink flow path.
- the maintenance of the members that constitute the ink supply path and recovery path is poor.
- the members that constitute the circulation path including the ink supply path and recovery path for each head are concentrated exclusively in the tank unit 70, so that the maintenance of these paths can be improved.
- the attached tank unit 70 can be removed and maintenance can be easily performed outside the carriage 3.
- a spare tank unit 70 it is also possible to reduce the downtime of the inkjet printer 1.
- independent tank units 70 corresponding to the heads of each color mounted on the carriage 3 can be attached and detached to the carriage 3, so that if a malfunction occurs in the ink supply path or recovery path of a specific color, maintenance can be performed easily and quickly by attaching and detaching only the tank unit 70 corresponding to that color.
- the first supply sub-tank 71A and the first recovery sub-tank 71B are supported by the frame 70F so as to hang down from the frame 70F, making it possible to effectively utilize the space below each sub-tank.
- the portion of the back frame 32 in which each screw hole is formed is exposed on the near side when the tank unit 70 is viewed from the front. Therefore, when attaching the tank unit 70 to the back frame 32, the sub-tanks do not block the areas around the screws 32H1 and 32H2, making the attachment work easy.
- the first supply subtank 71A and the first recovery subtank 71B are arranged above each ink head with a gap therebetween.
- the first supply pipe 711, the second supply pipe 712, the first recovery pipe 713, and the second recovery pipe 714 are arranged below the first supply subtank 71A and the first recovery subtank 71B in the tank unit 70 so that the first supply subtank 71A and the first recovery subtank 71B can be connected to the corresponding heads vertically. This improves the workability of arranging each flow path after the tank unit 70 is attached to the carriage 3.
- each subtank relative to the frame 70F is arranged above each subtank, so that the first supply pipe 711 to the second recovery pipe 714 are less likely to interfere with the support structure, and the connection work of each flow path can be easily performed.
- the frame 70F has a frame horizontal portion 70F1 and a frame back portion 70F2, the frame horizontal portion 70F1 is capable of supporting the first supply sub-tank 71A and the first recovery sub-tank 71B, and the frame back portion 70F2 is attached to the back frame 32 of the carriage 3. In this way, since the portions of the frame 70F that support the sub-tanks are different from the portions that are attached to the back frame 32, the installation work of the tank unit 70 can be easily performed.
- the frame horizontal portion 70F1 extends horizontally, and the frame back portion 70F2 extends vertically. Therefore, the frame horizontal portion 70F1 can stably support each sub-tank, and the frame back portion 70F2 can be easily attached to the back frame 32.
- the frame back 70F2 has a screw hole 70F4 (fixing portion, opening) that is fixed to the back frame 32 of the carriage 3, and a protrusion 70F5 that restricts the rotation of the frame 70F relative to the carriage 3. Therefore, when the carriage 3 moves back and forth in the main scanning direction, the tank unit 70 can be prevented from rotating due to the acceleration (inertial force) acting on the tank unit 70.
- the tank unit 70 can be temporarily secured in place by engaging the screw holes 70F3 and 70F4 formed in the frame back 70F2 with the screws 32H1 and 32H2 arranged on the back frame 32. Furthermore, the tank unit 70 can be permanently secured to the carriage 3 by tightening the screw 32H2. This prevents the tank unit 70 from falling off during work.
- the tank unit 70 has a filter 86, which is disposed at the rear end (front side) of the first supply sub-tank 71A and the first recovery sub-tank 71B in the mounting direction DS (FIG. 8) in which the frame 70F is mounted to the carriage 3 (FIGS. 6 and 7). Therefore, even when the tank unit 70 is mounted to the carriage 3, the filter 86 can be easily replaced, and the filling state inside the filter can be easily visually confirmed. Furthermore, if air, ink, or foreign matter accumulates inside the filter 86 as the inkjet printer 1 is used, these can be easily removed. An ink outlet (not shown) is provided on the underside of the filter 86, and ink can be discharged from inside the filter 86 by its own weight by removing a cap (not shown).
- the tank unit 70 has a heater 70H, and the heater 70H is disposed at the tip side (rear side) of the first supply subtank 71A and the first recovery subtank 71B in the mounting direction DS. Therefore, compared to the case where the heater 70H is disposed at the front side of the first supply subtank 71A and the first recovery subtank 71B, the state of the ink in each subtank can be easily confirmed from the front of the carriage 3. Furthermore, when the tank unit 70 is mounted on the carriage 3, the heater 70H faces and is close to the back frame 32, so that even if the heat insulating performance of the heater 70H is reduced, the heat of the heater 70H can be dissipated from the back frame 32 side.
- the heater 70H is located further back than each head in a plan view.
- the tank unit 70 has a circulation pump 85, which is supported by the heater 70H. Therefore, the circulation pump 85, which is relatively heavy among the tank units 70, is disposed in the lower part of the tank unit 70, and the center of gravity of the tank unit 70 can be lowered, so that the stability of the tank unit 70 in the carriage 3 can be improved. Furthermore, compared to when the circulation pump 85 is supported by the first supply subtank 71A or the first recovery subtank 71B or when it is supported by the frame 70F, the vibration of the circulation pump 85 is less likely to be transmitted to each subtank, and the ink detection by each capacitance sensor can be stably performed. Note that, when the heater 70H is in close contact with the back frame 32, it is also possible to release the vibration of the circulation pump 85 to the back frame 32 side.
- the tank unit 70 has a degasser 87, which is disposed at the rear end (front side) of the first supply sub-tank 71A and the first recovery sub-tank 71B in the mounting direction DS.
- a degasser 87 which is disposed at the rear end (front side) of the first supply sub-tank 71A and the first recovery sub-tank 71B in the mounting direction DS.
- the circulation pump 85 is positioned lower than the first supply sub-tank 71A and the first recovery sub-tank 71B. Therefore, as described above, the center of gravity of the tank unit 70 can be lowered, thereby increasing the stability of the tank unit 70 within the carriage 3.
- the tank unit 70 has a handle 70G (grip portion) (Figs. 6 and 7).
- the handle 70G is located above the frame 70F and can be grasped by an operator when mounting the frame 70F to the carriage 3. This reduces the operator's direct contact with the functional components that make up the tank unit 70, allowing the tank unit 70 to be safely mounted and removed from the carriage 3.
- the heater 70H is disposed upstream of the first supply sub-tank 71A in the flow of ink in the tank unit 70 ( Figure 4). This allows warmed ink to be supplied to the first supply sub-tank 71A, making it possible to supply ink at the desired temperature to each head, adjusting the viscosity of the ink and maintaining stable ink ejection performance.
- the heater 70H may be disposed upstream of the filter 86. More specifically, in FIG. 4, the heater 70H may be disposed between the circulation pump 85 and the filter 86. In this case, even if the ink heated by the heater 70H aggregates, the aggregates can be collected by the filter 86, preventing the aggregates from flowing into the first supply sub-tank 71A downstream or into each head.
- the heater 70H may be disposed upstream of the degasser 87. More specifically, in FIG. 4, the heater 70H may be disposed between the filter 86 and the degasser 87. In this case, bubbles tend to move upward in the ink heated by the heater 70H, and the bubbles can be efficiently removed by the degasser 87.
- the filter 86 is disposed upstream of the degasser 87. This allows the filter 86 to capture aggregates and other particles in the ink before the degassing process in the degasser 87, making it difficult for the aggregates and other particles to flow into the degasser 87, and allowing the performance of the degasser 87 to be stably maintained.
- Fig. 9 is a perspective view of the heater 70H according to this embodiment.
- Fig. 10 is an exploded perspective view of the heater 70H.
- the heater 70H is formed by seven plate-like members forming a layered structure.
- the heater 70H has a front cover 701, a rear cover 702, a flow path substrate 703, a front heater substrate 704, a rear heater substrate 705, a front insulation material 706, and a rear insulation material 707.
- the front cover 701 and rear cover 702 are members that form the exterior of the heater 70H, and protect the other plate-like members from the front and rear.
- the flow path substrate 703 is a member that forms the ink flow path, and as shown in FIG. 10, a spiral flow path is formed.
- the ink inlet and outlet are located at the lower end of the flow path substrate 703, and as shown in FIG. 9, they are exposed to the outside of the heater 70H.
- the front heater substrate 704 and rear heater substrate 705 are arranged to sandwich the flow path substrate 703 from the front and rear, defining a portion of the flow path and heating the ink in the flow path.
- four polyimide heaters 704A are arranged on the front heater substrate 704.
- a similar polyimide heater is also arranged on the rear heater substrate 705.
- the front heater substrate 704 and rear heater substrate 705 are welded to the flow path substrate 703 at multiple spot welds 704B. The outer periphery of each substrate is joined by fiber welding.
- Front insulation material 706 and rear insulation material 707 are arranged to cover front heater substrate 704 and rear heater substrate 705 from the front and rear outside, preventing heat from being released from each heater. As a result, the thermal efficiency of heater 70H is maintained at a high level.
- the cold ink that has flowed in flows along the inside of the spiral, while the warmed ink flows along the outside and is discharged from the flow path substrate 703. Therefore, heat exchange also takes place between the inner and outer periphery, further increasing the heat exchange efficiency.
- the heater 70H has a flow path substrate 703 having an ink flow path, and a pair of heater substrates 704, 705 that are arranged on either side of the flow path substrate 703 and heat the ink flowing through the flow path. Therefore, the ink flowing through the circulation path of the tank unit 70 can be efficiently heated and supplied to each head.
- this mounting method is a method of mounting the tank unit 70, which mounts the tank unit 70 having a first supply sub-tank 71A that contains liquid to be supplied to the head and a first recovery sub-tank 71B that contains the liquid recovered from the head, to the carriage 3 that includes the head.
- the mounting method includes mounting the first supply sub-tank 71A and the first recovery sub-tank 71B to the frame 70F, and mounting the frame 70F, on which the first supply sub-tank 71A and the first recovery sub-tank 71B are mounted, to the carriage 3 so that the liquid can be supplied from the first supply sub-tank 71A to the head and the liquid can be recovered from the head to the first recovery sub-tank 71B.
- This method makes it possible to easily attach the tank unit 70 to the carriage 3, which can supply ink to the first upstream ink head 41A and the first downstream ink head 41B and collect ink from these heads.
- the mounting method further includes connecting a first supply pipe 711 and a second supply pipe 712 extending from the first supply sub-tank 71A to each head, respectively, and connecting a first recovery pipe 713 and a second recovery pipe 714 extending from the first recovery sub-tank 71B to each head, respectively.
- the tank unit 70 can be easily attached to the carriage 3, and then the ink circulation paths can be easily formed by connecting each supply pipe and each recovery pipe to each head.
- the mounting method also includes: attaching a screw 32H2, which includes a threaded portion and a head, to a back frame 32 arranged on a carriage 3 with the head spaced forward from the back frame 32; positioning the tank unit 70 so that the head of the screw 32H2 enters a large diameter portion of a threaded hole 70F4 (fitting hole) formed in a frame back portion 70F2 of the frame 70F, the large diameter portion of the threaded hole 70F4 including a small diameter portion having an inner diameter corresponding to the threaded portion of the screw 32H2 and a large diameter portion arranged below the small diameter portion and having an inner diameter corresponding to the head; moving the tank unit 70 downward so that the small diameter portion of the threaded hole 70F4 fits into the threaded portion of the screw 32H2; and tightening the screw 32H2 to fix the tank unit 70 to the back frame 32.
- a screw 32H2 which includes a threaded portion and a head
- This mounting method allows the tank unit 70 to be easily mounted to the carriage 3.
- the tank unit 70 can be temporarily secured in place by engaging the screw 32H2 arranged on the back frame 32 with the screw hole 70F4 formed in the frame back 70F2.
- the tank unit 70 can be permanently secured to the carriage 3 by tightening the screw 32H2. This prevents the tank unit 70 from falling off during work.
- the tank unit 70 may be more stably supported and secured using the screw 32H1 and the screw hole 70F3.
- the mounting method may further include inserting a protrusion 70F5 formed on one of the frame 70F and the back frame 32 into a hole (not shown) formed on the other to prevent rotation of the tank unit 70.
- This mounting method makes it possible to prevent the tank unit 70 from rotating due to the acceleration (inertial force) acting on the tank unit 70 when the carriage 3 moves back and forth in the main scanning direction.
- the structure of the tank unit 70 described above further characterizes the above mounting method.
- the ink heads 4 are not limited to being arranged in two rows on the carriage 3.
- the ink heads 4 may be arranged in a single row, or in three or more rows.
- the inkjet printer 1 is not limited to being configured to be able to eject ink of multiple colors onto the workpiece W, and may be one that ejects ink of a single color.
- the inkjet printer 1 may be one in which the workpiece W is supported at a predetermined printing position, and multiple heads held by the carriage 3 eject liquid while moving in the main scanning direction and sub-scanning direction.
- the number of heads that receive the supply of and collect ink from each sub-tank may be one, or three or more.
- the inkjet printer 1 may not have the pre-treatment liquid head 5 that ejects the pre-treatment liquid, the post-treatment liquid head 6 that ejects the post-treatment liquid, or any of the components associated with these.
- Inkjet printer (recording device) 3 Carriage 4 Ink head (ejection head, supply destination) 41A: First upstream ink head 41B: First downstream ink head 5: Pre-treatment liquid head 6: Post-treatment liquid head 7: Sub-tank 70: Tank unit (liquid supply unit) 70F Frame 70F1 Frame horizontal portion 70F2 Frame back portion 70H Heater 710A, 710B Tank body 71A First supply sub-tank (supply tank) 71A1, 71B1 Capacitance sensor 71B First recovery sub-tank (recovery tank) Q Circulation flow path Q1 First ink path Q2 Second ink path Q3 Ink return path (return flow path) Q4 Ink refill path
Landscapes
- Ink Jet (AREA)
Abstract
Description
図1は、本開示の一実施形態に係るインクジェット式プリンター1の全体構成を示す斜視図であり、図2は、図1のII-II線の模式的な断面図である。インクジェット式プリンター1は、広幅且つ長尺のワークW(記録媒体、対象物)にインクジェット方式で画像を印刷するプリンターである。一例として、ワークWの幅は、数メートルに及ぶ。プリンター1は、装置フレーム10と、この装置フレーム10に組み込まれたワーク搬送部20及びキャリッジ3(装置本体)とを含む。なお、本実施形態では、左右方向がワークWに対する印刷の際の主走査方向S(図3)、後方から前方に向かう方向が副走査方向(主走査方向Sと交差する方向であるワークWの搬送方向F)である。
キャリッジ3について、さらに説明を加える。図3は、図1に示すキャリッジ3の拡大斜視図である。図3には、ワークWの搬送方向F(副走査方向)と、キャリッジ3の移動方向である主走査方向Sとが示されている。図3では、ワークWに対して画像形成用のインクを吐出する複数のインクヘッド4と、非発色性の処理液を吐出する前処理液ヘッド5及び後処理液ヘッド6と、これらのヘッド4~6に前記インク及び前記処理液を供給する複数のサブタンク7とが、キャリッジ3に搭載されている例を示している。
次に、本実施形態に係るインクジェット式プリンター1におけるインクおよび処理液の流れについて説明する。なお、以下では、インクの流れについて詳述するが、各処理液についても、同様の構造が設けられている。図4は、本実施形態に係る第1上流インクヘッド41Aおよび第1下流インクヘッド41Bの周辺のインクの流れを示す模式図である。図5は、本実施形態に係る供給サブタンクおよび回収サブタンクを示す模式図である。なお、各図において、部材同士を繋ぐ線は、気体や液体が流れる管路(チューブ)を示している。
次に、図3乃至図5に示される各サブタンクの構造について、更に詳述する。図6は、本実施形態に係るタンクユニット70(液体供給ユニット)の斜視図である。図7は、タンクユニット70の斜視図であって、図6の反対側から見た斜視図である。図8は、本実施形態に係るキャリッジ3に複数のタンクユニット70が装着された様子を示す斜視図である。なお、図8では、各ヘッドの図示を省略している。
次に、タンクユニット70が備えるヒーター70Hの構造について詳述する。図9は、本実施形態に係るヒーター70Hの斜視図である。図10は、ヒーター70Hの分解斜視図である。本実施形態では、図10に示すように、ヒーター70Hは、7枚の板状部材が層構造をなすことで形成されている。
上記で説明した、キャリッジ3に対するタンクユニット70の取付態様は、以下のようなタンクユニット70の取付方法を含む。すなわち、当該取付方法は、前記ヘッドに供給される液体を収容する第1供給サブタンク71Aと、前記ヘッドから回収される前記液体を収容する第1回収サブタンク71Bと、を有するタンクユニット70を、前記ヘッドを含むキャリッジ3に取り付ける、タンクユニット70の取付方法である。
3 キャリッジ
4 インクヘッド(吐出ヘッド、供給先)
41A 第1上流インクヘッド
41B 第1下流インクヘッド
5 前処理液ヘッド
6 後処理液ヘッド
7 サブタンク
70 タンクユニット(液体供給ユニット)
70F フレーム
70F1 フレーム水平部
70F2 フレーム背部
70H ヒーター
710A、710B タンク本体
71A 第1供給サブタンク(供給タンク)
71A1、71B1 静電容量センサ
71B 第1回収サブタンク(回収タンク)
Q 循環流路
Q1 第1インク経路
Q2 第2インク経路
Q3 インク戻り路(戻り流路)
Q4 インク補充路
Claims (25)
- 供給先に供給される液体を収容する供給タンクと、
前記供給先から回収される前記液体を収容する回収タンクと、
前記供給タンクおよび前記回収タンクを支持するとともに、前記供給先を含む装置本体に着脱可能に装着される支持体と、
を備える、液体供給ユニット。 - 前記供給タンクに連通し、前記装置本体に前記支持体が装着された状態で前記供給先に接続可能な供給管と、
前記回収タンクに連通し、前記装置本体に前記支持体が装着された状態で前記供給先に接続可能な回収管と、
を更に備える、請求項1に記載の液体供給ユニット。 - 前記供給タンクおよび前記回収タンクは、前記支持体から垂下するように前記支持体に支持されている、請求項1に記載の液体供給ユニット。
- 前記支持体が前記装置本体に装着されると、前記供給タンクおよび前記回収タンクは前記供給先の上方に間隔をおいて配置され、
前記供給管および前記回収管は、前記供給タンクおよび前記回収タンクと前記供給先とを上下に接続可能なように、前記供給タンクおよび前記回収タンクの下方に配置されている、請求項2の記載の液体供給ユニット。 - 前記支持体は、
前記供給タンクおよび前記回収タンクを支持可能な第1支持部と、
前記装置本体に装着される第2支持部と、
を有する、請求項1に記載の液体供給ユニット。 - 前記第1支持部は水平方向に延びており、前記第2支持部は鉛直方向に延びている、請求項5に記載の液体供給ユニット。
- 前記第2支持部は、
前記装置本体に含まれ主走査方向に移動可能なキャリッジに固定される固定部と、
前記固定部と間隔をおいて配置され、前記キャリッジに対する前記支持体の回転を規制する回転規制部と、
を有する、請求項6に記載の液体供給ユニット。 - 前記固定部には、前記キャリッジに配設されたねじに係合可能であるとともに、前記ねじによって前記キャリッジに固定される開口部を含む、請求項7に記載の液体供給ユニット。
- 前記回収タンクから前記供給タンクまで配設され、前記液体が流れる戻り流路と、
前記戻り流路に配置され、前記液体中の異物を捕集するフィルタと、
を更に備え、
前記フィルタは、前記支持体が前記装置本体に装着される装着方向において、前記供給タンクおよび前記回収タンクの後端側に配置されている、請求項1に記載の液体供給ユニット。 - 前記回収タンクから前記供給タンクまで配設され、前記液体が流れる戻り流路と、
前記戻り流路を流れる前記液体を加温するヒーターと、
を更に備え、
前記ヒーターは、前記支持体が前記装置本体に装着される装着方向において、前記供給タンクおよび前記回収タンクの先端側に配置されている、請求項1に記載の液体供給ユニット。 - 前記戻り流路に配置され前記供給タンクに向かって前記液体を吐出するポンプを更に備え、
前記ポンプは、前記ヒーターに支持されている、請求項10に記載の液体供給ユニット。 - 前記回収タンクから前記供給タンクまで配設され、前記液体が流れる戻り流路と、
前記戻り流路を流れる前記液体を脱気するデガッサと、
を更に備え、
前記デガッサは、前記支持体が前記装置本体に装着される装着方向において、前記供給タンクおよび前記回収タンクの後端側に配置されている、請求項1に記載の液体供給ユニット。 - 前記回収タンクから前記供給タンクまで配設され、前記液体が流れる戻り流路と、
前記戻り流路に配置され前記供給タンクに向かって前記液体を吐出するポンプと、
を更に備え、
前記ポンプは、前記供給タンクおよび前記回収タンクよりも低い位置に配置されている、請求項1に記載の液体供給ユニット。 - 前記支持体の上方に配置され、前記支持体の前記装置本体に対する装着時に把持されることが可能な把持部を更に備える、請求項1に記載の液体供給ユニット。
- 前記回収タンクから前記供給タンクまで配設され、前記液体が流れる戻り流路と、
前記戻り流路を流れる前記液体を加温するヒーターと、
を更に備え、
前記液体の流れにおいて、前記ヒーターは前記供給タンクの上流側に配置されている、請求項1に記載の液体供給ユニット。 - 前記回収タンクから前記供給タンクまで配設され、前記液体が流れる戻り流路と、
前記戻り流路を流れる前記液体を加温するヒーターと、
前記戻り流路に配置され、前記液体中の異物を捕集するフィルタと、
を更に備え、
前記液体の流れにおいて、前記ヒーターは前記フィルタの上流側に配置されている、請求項1または15に記載の液体供給ユニット。 - 前記回収タンクから前記供給タンクまで配設され、前記液体が流れる戻り流路と、
前記戻り流路を流れる前記液体を加温するヒーターと、
前記戻り流路を流れる前記液体を脱気するデガッサと、
を更に備え、
前記液体の流れにおいて、前記ヒーターは前記デガッサの上流側に配置されている、請求項1または15に記載の液体供給ユニット。 - 前記戻り流路に配置され、前記液体中の異物を捕集するフィルタを更に備え、
前記液体の流れにおいて、前記フィルタは前記デガッサの上流側に配置されている、請求項17に記載の液体供給ユニット。 - 前記回収タンクから前記供給タンクまで配設され、前記液体が流れる戻り流路と、
前記戻り流路を流れる前記液体を加温するヒーターと、
を更に備え、
前記ヒーターは、前記液体の流路を有する流路基板と、前記流路基板を挟むように配置され、前記流路を流れる前記液体を加温する一対のヒーター基板と、を有する、請求項1に記載の液体供給ユニット。 - 請求項1に記載の液体供給ユニットと、
前記供給先として前記液体の供給を受け、当該液体を記録媒体に吐出する少なくとも一つの吐出ヘッドと、
を備える、記録装置。 - 前記少なくとも一つの吐出ヘッドは、異なる液体を吐出する複数の吐出ヘッドを有し、
前記異なる液体を前記複数の吐出ヘッドにそれぞれ供給可能な複数の前記液体供給ユニットと、
を備える、請求項20に記載の記録装置。 - 液体をそれぞれ収容することが可能な供給タンクおよび回収タンクと、を有する液体供給ユニットを、供給先を含む装置本体に取り付ける、液体供給ユニットの取付方法であって、
前記供給タンクおよび前記回収タンクを支持体に装着することと、
前記供給タンクから前記供給先に前記液体を供給するとともに、前記供給先から前記回収タンクに前記液体を回収可能なように、前記供給タンクおよび前記回収タンクが装着された前記支持体を前記装置本体に取り付けることと、
を備える、液体供給ユニットの取付方法。 - 前記供給タンクから延びる供給管および前記回収タンクから延びる回収管をそれぞれ前記供給先に接続することを更に備える、請求項22に記載の液体供給ユニットの取付方法。
- 前記支持体を前記装置本体に取り付けることは、
前記装置本体に配置される壁部に対して、ねじ部と頭部とを含むねじを、前記頭部が前記壁部から離間した状態で装着することと、
前記支持体に形成された嵌合穴であって、前記ねじ部に対応する内径を有する小径部と前記小径部の下方に配置され前記頭部に対応する内径を有する大径部とを含む嵌合穴の前記大径部に前記頭部が進入するように、前記液体供給ユニットを配置することと、
前記支持体の前記嵌合穴の前記小径部が前記ねじの前記ねじ部に嵌合するように、前記液体供給ユニットを下方に移動させることと、
前記ねじを締め込み、前記液体供給ユニットを前記壁部に固定することと、
を含む、請求項22に記載の液体供給ユニットの取付方法。 - 前記支持体および前記壁部うちの一方に形成された突起を他方に形成された孔部に挿入することで、前記液体供給ユニットの回転を防ぐことを更に備える、請求項24に記載の液体供給ユニットの取付方法。
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH058400A (ja) * | 1991-07-05 | 1993-01-19 | Ricoh Co Ltd | インクジエツト記録装置 |
| JPH0760991A (ja) | 1993-08-26 | 1995-03-07 | Canon Inc | インクジェット記録装置および排インク処理方法 |
| JPH10181043A (ja) * | 1996-12-26 | 1998-07-07 | Canon Inc | 液体噴射記録装置 |
| JP2002200771A (ja) * | 2000-12-28 | 2002-07-16 | Seiko Epson Corp | インクジェット記録装置 |
| WO2014188955A1 (ja) * | 2013-05-20 | 2014-11-27 | コニカミノルタ株式会社 | インクジェット記録装置及び記録ヘッドのメンテナンス方法 |
| JP2018069490A (ja) * | 2016-10-26 | 2018-05-10 | セイコーエプソン株式会社 | 液体供給装置及び印刷装置 |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH058400A (ja) * | 1991-07-05 | 1993-01-19 | Ricoh Co Ltd | インクジエツト記録装置 |
| JPH0760991A (ja) | 1993-08-26 | 1995-03-07 | Canon Inc | インクジェット記録装置および排インク処理方法 |
| JPH10181043A (ja) * | 1996-12-26 | 1998-07-07 | Canon Inc | 液体噴射記録装置 |
| JP2002200771A (ja) * | 2000-12-28 | 2002-07-16 | Seiko Epson Corp | インクジェット記録装置 |
| WO2014188955A1 (ja) * | 2013-05-20 | 2014-11-27 | コニカミノルタ株式会社 | インクジェット記録装置及び記録ヘッドのメンテナンス方法 |
| JP2018069490A (ja) * | 2016-10-26 | 2018-05-10 | セイコーエプソン株式会社 | 液体供給装置及び印刷装置 |
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