JP5383341B2 - Ink jet recording apparatus stop processing method - Google Patents

Description

  The present invention relates to a stop processing method of an ink jet recording apparatus for cleaning ink remaining in a flow path when the operation of the ink jet recording apparatus is stopped.

  As an inkjet recording apparatus for printing or marking characters or figures on a product conveyed by a conveying device of a production line as a printing object, the ink is applied without bringing the nozzle of the print head into contact with the printing object. A non-contact type that is made to fly from the nozzle toward the printed material is used. For example, when printing characters or the like on the surface of a packaging material such as a cardboard box in which products are packed, the outer surface of the packaging material is printed by an inkjet recording device while being conveyed by a conveyor, and food and drinks are contained. Even when printing on the container, printing is performed on the outer surface of the container while being conveyed by a conveyor.

  On the other hand, as described above, the printing head is stopped when printing is performed while the printing material is moved, whereas the printing material is used with the conveyor stopped when printing is performed. When printing on the print head, the print head is moved along the substrate. For example, when printing at a plurality of locations on the collective printed circuit board, printing is performed by moving the print head in a two-dimensional direction along the printed circuit board while the conveyor is stopped.

  The print head is provided with a charging electrode that charges the ink particles ejected from the nozzles according to the printing information and a deflection electrode that deflects the charged ink particles. A gutter is arranged opposite the nozzle for recovery. An ink supply channel for supplying ink in the ink container is connected to the nozzle, and a collection channel for collecting the ink collected by the gutter in the ink container is connected between the gutter and the ink container. In order to suck outside air into the nozzle and prevent clogging of the nozzle, a suction flow path is connected between the inflow portion of the nozzle and the ink container. Further, a solvent supply channel is connected between the solvent container and the nozzle in order to clean the nozzle and each channel described above.

  The ink jet recording apparatus has an apparatus main body in which an ink container, a solvent container, and the like are incorporated, and a print head is connected to the apparatus main body by a conduit having a pipe such as a hose forming each flow path. As a conventional ink jet recording apparatus, there is a type in which a pump is provided in each of an ink supply channel, a recovery channel, a suction channel, and a solvent supply channel, as described in Patent Documents 1 and 2. In the ink jet recording apparatus described in Patent Document 2, four pumps are detachable from the apparatus main body as an integral pump unit.

  The ink jet recording apparatuses described in Patent Document 3 and Patent Document 4 operate the suction flow path and the recovery flow path with a single pump, and include an ink supply pump and a solvent supply pump. It has three pumps.

JP 10-337882 A JP 2007-190725 A JP-A-8-258287 JP 2001-71532 A

  Inkjet recording devices use a highly volatile organic solvent as a solvent, and ink in which resin or dye is dissolved is circulated in the device. Therefore, when stopping the operation of the device, the solvent in the device is used inside the nozzle. In addition, it is circulated through each flow path to dissolve and remove solids such as resin and dye in the ink. As a result, the solid content in the remaining ink can be prevented from adhering to the inside of the nozzle or each flow path while the operation of the apparatus is stopped, and the apparatus can be restarted normally.

  In the conventional ink jet recording apparatus, as described in Patent Document 4, the solid matter of ink is removed from the inside of each nozzle and each flow path by circulating a solvent. Therefore, the longer the cleaning is performed and the more solvent is used for cleaning, the more solid ink can be removed. However, the more solvent used, not only increases the running cost but also circulates in the apparatus. As a result, the density of the ink is reduced, and it is difficult to ensure stable operation of the apparatus. For this reason, a technique for efficiently cleaning by reducing the amount of solvent used has been studied.

  One end of the suction channel communicates with the nozzle outlet and is opened to the atmosphere, and an electromagnetic valve for opening and closing the channel is provided on the other end side of the suction channel. One end of the recovery flow path communicates with the gutter and is open to the atmosphere, and an electromagnetic valve for opening and closing the flow path is provided on the other end side of the recovery flow path. Therefore, if the device is left in a state where liquid such as ink or solvent remains in the suction flow path or the recovery flow path, the thermal expansion of the remaining liquid due to changes in the ambient temperature during the time left or the heat of the air in the gas phase Due to the expansion, the liquid moves toward a portion that is open to the atmosphere, such as a nozzle or a gutter, and a phenomenon in which the liquid oozes out from the opening portion occurs.

  If the liquid that oozes out is ink or a solvent containing ink, the solvent component will volatilize in the atmosphere after leaching out, and the remaining ink solid will solidify and close the opening, so inkjet Prior to restarting the recording apparatus, it is necessary to wash the solidified ink solid content. For this reason, there is a problem that not only a great effort is required at the time of re-operation, but also the consumption of the cleaning liquid increases and the running cost of the apparatus increases.

  If the amount of ink solids contained in the liquid that oozes out is small enough not to block the nozzle or gutter opening, the above-mentioned problem does not occur, but for this purpose, the operation of the ink jet recording apparatus is stopped. At this time, it is necessary to consume a large amount of solvent to clean the suction flow path and the recovery flow path. As a result, not only the running cost increases, but also the ink in the apparatus is diluted with a large amount of solvent each time it is stopped. This will adversely affect the print quality. In addition, if all the liquid in the suction channel and the recovery channel is sucked and removed, the liquid will not ooze out from the opening, but it takes time to suck all the liquid. The stop processing time becomes longer.

  If the solenoid valve that opens and closes the suction flow path and the electromagnetic valve that opens and closes the recovery flow path are incorporated in the print head equipped with nozzles and gutters, the flow path to be cleaned becomes shorter. However, if a solenoid valve is incorporated in the print head, an increase in the size of the print head cannot be avoided, and there is a problem in that the installation property of the print head becomes extremely poor.

  Since the ink jet recording apparatus is installed in a limited space around the production line, downsizing of the apparatus is required. If a pump is provided in each of the ink supply flow path, the recovery flow path, the suction flow path, and the solvent supply flow path as in the prior art, a space for installing these pumps is required. It was difficult to convert.

  On the other hand, if the suction flow path and the recovery flow path are connected to the merge flow path, and the suction pump and the recovery pump are integrated by the suction pump provided in the merge flow path, the number of pumps is reduced. be able to. However, when performing the stop process, if the suction flow path and the recovery flow path are sucked at the same time, the flow rate of the liquid flowing through each flow path is reduced as compared with the case of suction by separate independent pumps. Will drop. If each flow path is provided with an electromagnetic valve and only one flow path is sucked by one pump by switching the electromagnetic valve, and the other flow path is sucked alone after the suction, the desired suction can be performed, Since suction can be performed only for each channel, there is a problem that the stop processing time is increased as a result.

  An object of the present invention is to enable the ink jet recording apparatus to be stopped by using a small amount of solvent.

  Another object of the present invention is to make it possible to efficiently stop the ink jet recording apparatus in a short time.

An ink jet recording apparatus stop processing method according to the present invention includes an ink supply channel connected between an ink container and a nozzle to supply ink in the ink container toward the nozzle, and between the solvent container and the nozzle. The solvent supply flow path for supplying the solvent to the nozzle connected to the nozzle, the gutter for collecting ink that has not been used for printing, and the liquid recovered by the gutter connected to the ink container are recovered in the ink container A recovery flow path, a suction flow path that is connected between the inflow portion of the nozzle and the ink container, guides liquid to the ink container, a solvent chamber that communicates with the solvent supply flow path, and an elasticity to the solvent chamber together are partitioned by deformable partition member ink chamber communicating is provided in the ink supply flow passage, the partition member an elastic force in a direction to increase the volume of the solvent chamber A pressure chamber having a spring member for applying, a stop processing method for an ink jet recording apparatus having an electromagnetic valve which is located downstream to open and close the provided passages to the solvent supply flow channel of the pressure chamber, said nozzle When the supply of ink to the nozzle is stopped from the printing state in which ink is ejected from the solvent, the solvent that has flowed into the solvent chamber during printing in a state where the solvent supply channel is closed by the electromagnetic valve Solvent supply step of opening the valve and pressurizing the ink chamber with ink supplied from the ink container by a supply pump and supplying the ink chamber to the nozzle and the recovery flow path to clean the nozzle and the recovery flow path And a suction flow path cleaning process for supplying a solvent from the solvent supply flow path to the suction flow path with the electromagnetic valve opened, and the suction flow path A residual liquid suction step of sucking outside air from the nozzle and flowing air into the suction flow path to send the solvent in the suction flow path to the ink container; and the inside of the suction flow path is replaced with air from the solvent. And a final cleaning step of flowing a solvent from the solvent supply channel into the suction channel.

Stop processing method for an ink jet recording apparatus of the present invention has a front Symbol residual liquid removing step of the suction passage of the liquid in the suction flow path takes in outside air flow path within sent to the ink container, the recovery flow path The process of removing the residual liquid in the recovery flow path for taking outside air and sending the liquid in the flow path to the ink container is repeated a plurality of times. In the ink jet recording apparatus stop processing method of the present invention, the pressure in the suction channel is detected, and the residual liquid removal step in the suction channel is switched to the residual liquid removal step in the recovery channel based on the pressure value. It is characterized by. According to the stop processing method of the ink jet recording apparatus of the present invention, the number of rotations of the collection pump that sucks the liquid in the collection channel is set to the number of rotations when collecting ink that has not been used through the collection channel during a printing operation. Rather, the number of rotations during the stop process is increased.

In the stop processing method for an ink jet recording apparatus according to the present invention, a spring member for applying an elastic force in a direction of enlarging the volume of the solvent chamber is provided in the solvent chamber, and the solvent is supplied to the nozzle and the recovery channel. the time, the pre-Symbol ink chamber is pressurized against the elastic force by supplying the solvent of the solvent chamber and the recovery flow path and the nozzle, when supplying the solvent to the suction passage The solvent in the solvent container is supplied to the suction channel through the solvent chamber by sucking the suction channel. In the ink jet recording apparatus stop processing method of the present invention, the recovery flow path and the suction flow path are collected by a recovery pump provided in a merge flow path that joins the recovery flow path and the suction flow path and is connected to the ink container. The flow path is sucked and operated.

  According to the present invention, when the stop process is performed, the solvent is supplied to the suction channel to clean the suction channel, and the solvent used for the cleaning is removed by sucking the outside air from the nozzle into the suction channel. After the replacement with air, the solvent is supplied again into the suction flow path to perform the final cleaning. Therefore, when the final cleaning is performed, the solvent supplied in the cleaning process is removed in the suction flow path. In addition, the solvent is intermittently supplied to the suction flow path through the residual liquid suction step for replacing with the outside air. This greatly reduces the amount of solvent supplied to the suction flow path in both the cleaning process and the final cleaning process, compared to the case where the flow path is washed by continuously flowing the solvent through the suction flow path. The suction flow path can be made clean, and the inkjet recording apparatus can be stopped by using a small amount of solvent.

  When the liquid is discharged from the suction flow path, outside air is introduced from the nozzle outlet. The inner diameter of the jet outlet is smaller than the inner diameter of the gutter, and it is difficult for outside air to enter the suction channel. Can be done quickly. By alternately repeating the residual liquid removal in the suction flow path and the residual liquid removal in the recovery flow path, outside air is introduced from the outside into the suction flow path when the residual liquid in the recovery flow path is being removed. If the residual liquid in the suction channel is removed, the residual liquid can be removed from the suction channel and the recovery channel without lengthening the removal time compared to the method of continuously removing the residual liquid in the suction channel. Can be removed. Therefore, even if the residual liquid in the suction flow path and the recovery flow path is removed by one recovery pump, the residual liquid can be efficiently removed and the stop process can be performed in a short time.

  When a pressure chamber in which an ink chamber connected to the ink supply channel and a solvent chamber connected to the solvent supply channel are partitioned by a partition member is provided in the channel, the supply for supplying ink to the ink supply channel Since the solvent supplied from the solvent container to the solvent chamber can be supplied to the nozzle using the pump, the ink can be supplied and the solvent can be supplied by one supply pump. When such a pressure chamber is used, the solvent in the solvent container can be supplied to the suction channel via the solvent chamber without spraying the solvent to the nozzle by setting the suction channel to a negative pressure state. .

It is a perspective view which shows the inkjet recording device in the state which is performing the printing process with respect to the to-be-printed material conveyed by the conveyor. FIG. 2 is a schematic view showing an internal structure of the print head shown in FIG. 1. FIG. 3 is a liquid path diagram of the ink jet recording apparatus. FIG. 4 is a cross-sectional view of the pressure chamber shown in FIG. 3. It is a block diagram which shows the control circuit of an inkjet recording device. It is a flowchart which shows the stop process sequence of an inkjet recording device. It is a liquid path | route figure which shows the flow of the ink when printing operation is performed with a thick line. It is a liquid path | route figure which shows the flow of the liquid in the solvent supply process which supplies a solvent to these flow paths in order to wash | clean a nozzle and a collection | recovery flow path, and shows it with a thick line. It is a liquid path | route figure which shows the flow of the liquid in the washing | cleaning process of a suction flow path with a thick line. It is a liquid path | route figure which shows the flow of the liquid in the residual liquid attraction | suction washing process which replaces the liquid in a suction flow path with air with a thick line. It is a liquid path | route figure which shows the flow of the liquid in the finishing washing | cleaning process which supplies a solvent again to a suction flow path with a thick line. It is a liquid path | route figure which shows the flow of the liquid in the residual liquid removal process of a suction channel with a thick line. It is a liquid path | route figure which shows the flow of the liquid in the residual liquid removal process of a collection | recovery flow path with a thick line. It is a liquid path | route figure which shows the flow of the liquid in the residual pressure release process in an ink supply flow path with a thick line.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the inkjet recording apparatus 10 has an apparatus main body 12 provided with an operation display unit 11 on the front, and a print head 13 is connected to the apparatus main body 12 by a conduit 14. For example, as shown in FIG. 1, the ink jet recording apparatus 10 is installed in a production line of a factory that produces food, beverages, etc., and markings a package such as food as an object to be printed, that is, an article to be printed W. Used to apply. The apparatus main body 12 is disposed on a support base (not shown) so as to be in a position where the user can operate. The print head 13 is installed close to the substrate W to be conveyed by the belt conveyor 15, and the inkjet recording apparatus 10 performs a printing operation on the substrate W on the belt conveyor 15 that moves in the direction indicated by the arrow T. Is called.

  The belt conveyor 15 as a production line includes an encoder 16 that outputs a signal corresponding to the conveyance speed and a substrate W for printing on the printing object W with the same width regardless of the conveyance speed of the belt conveyor 15. A print sensor 17 is provided for detecting and outputting a signal for instructing the ink jet recording apparatus 10 to start printing. The encoder 16 and the print sensor 17 each provide a signal line to a control unit in the apparatus body 12. Connected through.

  As shown in FIG. 2, the print head 13 includes a nozzle 20 that ejects ink columns 18, and an ink supply flow for supplying ink in a main ink container 22 disposed in the apparatus main body 12 to the nozzle 20. A path 23 is connected, and a supply pump 24 is provided in the ink supply path 23. The ink in the main ink container 22 is sucked and pressurized by the supply pump 24 to become the ink column 18 and is ejected from the ejection port 21 of the nozzle 20. The nozzle 20 is provided with an electrostrictive element 25, and the ink is vibrated at a predetermined frequency by the electrostrictive element 25 so that the ink column 18 discharged from the nozzle 21 of the nozzle 20 is made into particles. It has become. Thereby, the number of generated ink particles 19 is determined by the frequency of the excitation voltage applied to the electrostrictive element 25, and is the same as the frequency.

  A charging electrode 26 is disposed in front of the nozzle 20, and an electric charge is applied to the ink particles 19 by applying a voltage having a magnitude corresponding to print information to the charging electrode 26. A deflection electrode 27 is disposed in front of the charging electrode 26, and the ink particles 19 charged by the charging electrode 26 exert a force proportional to the charge amount while flying in the electric field between the deflection electrodes 27. The light is received, deflected, flies toward the printing object W, and is landed on the printing object W. At this time, the landing position of the ink particles 19 in the deflection direction indicated by the arrow R changes according to the charge amount, and the belt conveyor 15 moves the printing material W in the transport direction T perpendicular to the deflection direction R. The ink particles 19 can be landed in a direction orthogonal to the deflection direction, and a character or a figure is marked on the printing object W by the plurality of landed particles.

  In order to collect the ink particles 19 that are not used for printing, a gutter 28 is disposed in the print head 13 so as to face the nozzle 21 of the nozzle 20, and linearly without being deflected between the deflection electrodes 27. The flying ink particles 19 are captured by the gutter 28. The trapped ink particles 19 are collected in the main ink container 22 by the collection channel 29.

  As shown in FIG. 3, the apparatus main body 12 is provided with the main ink container 22 shown in FIG. 2 for containing circulating ink, and the main ink container 22 is provided with a liquid level sensor 30. It has been. The liquid level sensor 30 detects whether or not the liquid stored in the main ink container 22 is at a reference liquid level that is an appropriate amount. An electromagnetic valve 31 is provided in the ink supply flow path 23 connected between the main ink container 22 and the nozzle 20, and the ink supply flow path 23 is opened and closed by the electromagnetic valve 31. When a printing process is performed on the printing object W, the ink is normally supplied via the electromagnetic valve 31 by operating the supply pump 24 provided in the ink supply flow path 23 and opening the electromagnetic valve 31. The ink in the main ink container 22 is supplied to the nozzle 20 through the flow path 23. A bypass flow path 32 is connected between the main ink container 22 and the inlet side of the supply pump 24. The bypass flow path 32 is provided with an electromagnetic valve 33 for opening and closing the flow path and a viscosity measuring device 34 which is a drop type viscometer for measuring the viscosity of the ink, and performs ink viscosity measurement. In this case, the supply pump 24 is operated under the state where the bypass flow path 32 is opened by the electromagnetic valve 33, and the ink to be measured is refreshed by sucking ink through the bypass flow path 32.

  The ink supply flow path 23 is supplied from the supply pump 24 and supplied to the nozzle 20 by a filter 35 for removing foreign matters mixed in the ink supplied from the main ink container 22 by the supply pump 24. A pressure reducing valve 36 for adjusting the ink to a pressure suitable for printing is provided. An auxiliary ink container 37 filled with replenishing ink is arranged in the apparatus main body 12. The auxiliary ink container 37 is connected to the ink supply flow path 23 via a replenishment flow path 38, and the replenishment flow path 38 is provided with an electromagnetic valve 39 that opens and closes this flow path. When the supply pump 24 is driven in a state where the 38 is opened, the ink in the auxiliary ink container 37 is supplied to the ink supply flow path 23.

  The other end of the recovery channel 29 provided with a gutter 28 at one end is attached to the main ink container 22, and a recovery pump 41 is provided in the recovery channel 29. By driving the recovery pump 41, the liquid recovered by the gutter 28 is recovered to the main ink container 22 via the recovery flow path 29. The recovery flow path 29 is provided with an electromagnetic valve 42 for opening and closing the flow path and a filter 43 for removing foreign substances contained in the liquid flowing in the flow path.

  A solvent container 44 that contains a solvent is provided in the apparatus main body 12, and the solvent is used for adjusting the viscosity of the ink and for cleaning the nozzle 20 and the like when the inkjet recording apparatus 10 is stopped. The solvent supply channel 45 whose one end is attached to the solvent container 44 is connected to the nozzle 20 via a three-port electromagnetic valve 46 provided in the ink supply channel 23, and is connected via the solvent supply channel 45. The solvent in the solvent container 44 is supplied to the nozzle 20. The three-port solenoid valve 46 has a secondary port connected to the nozzle 20 and two primary ports, and one of the primary ports is connected to the ink supply channel 23 and the other primary port. Is connected to the solvent supply channel 45. As shown in FIG. 3, the primary side port to which the ink supply flow path 23 is connected is a normally closed port that is closed when the coil is not energized, and the primary side port to which the solvent supply flow path 45 is connected. Is a normally open port that communicates with the secondary port when the coil is not energized. Therefore, the three-port solenoid valve 46 is in a state where ink is supplied from the ink supply channel 23 toward the nozzle 20 to the secondary port, and the solvent is supplied from the solvent supply channel 45 toward the nozzle 20 to the secondary port. This is a flow path switching valve that switches the flow path to the state where is supplied.

  As shown in FIG. 3, the ink jet recording apparatus 10 has a pressure vessel, that is, a pressure chamber 47. The pressure chamber 47 includes an ink chamber 48 that communicates with the ink supply channel 23 and a solvent chamber 49 that communicates with the solvent supply channel 45, which are partitioned by a partition member 50.

  FIG. 4 is a cross-sectional view showing the pressure chamber 47. As shown in FIG. 4, the pressure chamber 47 has a housing 51, and the inside of the housing 51 is partitioned into an ink chamber 48 and a solvent chamber 49 by a partition member 50 made of an elastically deformable diaphragm attached to the housing 51. Yes. An inflow side port 48 a formed in the housing 51 in communication with the ink chamber 48 is connected to the upstream side of the ink supply flow path 23, that is, the supply pump 24 side, and the outflow side port 48 b is connected to the downstream side of the ink supply flow path 23, that is, the nozzle. It is connected to the 20 side. An inflow side port 49 a formed in the housing 51 in communication with the solvent chamber 49 is connected to the upstream side of the solvent supply channel 45, that is, the solvent container 44 side, and the outflow side port 49 b is connected to the downstream side of the solvent supply channel 45, that is, the nozzle. It is connected to the 20 side. A compression coil spring 52 that applies an elastic force to the partition member 50 in the direction of increasing the volume of the solvent chamber 49 is incorporated in the solvent chamber 49 as a spring member, and the compression coil spring 52 contacts the partition member 50. The spring receiving piece 53 is in contact with the end wall surface of the housing 51.

  As shown in FIG. 3, the solvent supply channel 45 is provided with a check valve 54 on the upstream side of the pressure chamber 47, and the check valve 54 is configured to supply the solvent from the solvent container 44 to the pressure chamber 47. Allow flow and block reverse flow. The solvent supply channel 45 is provided with an electromagnetic valve 55 that opens and closes the solvent supply channel 45 on the downstream side of the pressure chamber 47. Therefore, under the state where the supply pump 24 is not operated, the volume of the solvent chamber 49 is expanded by the elastic force of the compression coil spring 52 as a spring member, as shown in FIG. As a result, the solvent in the solvent container 44 is sucked into the solvent chamber 49 via the check valve 54. On the other hand, when the supply pump 24 is driven to pressurize the ink chamber 48 with ink to pressurize the solvent chamber 49 via the partition member 50, and the solenoid valve 55 is driven to open the solvent supply channel 45. As shown in FIG. 4 (B), the solvent chamber 49 contracts. As a result, the ink in the ink chamber 48 is supplied toward the nozzle 20.

  In this way, by providing the pressure chamber 47 having the ink chamber 48 communicating with the ink supply channel 23 and the solvent chamber 49 communicating with the solvent supply channel 45 in the channel, the supply pump 24 can supply the ink. Since the solvent supply can be shared, the number of pumps can be reduced as compared with a mode in which a supply pump is provided in the solvent supply flow path 45, and the apparatus can be downsized.

  Since the solvent chamber 49 of the pressure chamber 47 communicates with the solvent supply channel 45, the solvent supply channel 45 and the suction channel 56 communicate with each other via the three-port solenoid valve 46. When the recovery pump 41 is driven, the suction flow path 56 and the solvent supply flow path 45 are in a negative pressure state, so that the solvent in the solvent container 44 passes through the check valve 54 and is sucked toward the suction flow path 56. It will be. At this time, the solvent is supplied to the suction channel 56 without driving the supply pump 24 to pressurize the solvent in the solvent chamber 49 by the ink chamber 48.

  As shown in FIG. 3, a suction channel 56 is provided between the inflow portion of the nozzle 20 and the main ink container 22, and the pipes constituting the suction channel 56 are the ink supply channel 23, As shown in FIG. 1, together with the pipes constituting the recovery flow path 29 and the solvent supply flow path 45, they are bundled in a conduit 14 and connected between the apparatus main body 12 and the print head 13.

  The ink in the auxiliary ink container 37 and the solvent in the solvent container 44 are supplied into the main ink container 22 through the suction channel 56, and a suction operation is performed when the nozzle 21 of the nozzle 20 is clogged. Can do. The suction flow path 56 is provided with an electromagnetic valve 57 that opens and closes the flow path, and a pressure gauge 58 that measures the pressure of the fluid in the flow path. The suction flow path 56 is connected to the recovery flow path 29 at the connection portion 61, and a portion of the recovery flow path 29 from the connection portion 61 to the main ink container 22 is a merging flow path 62. Since the recovery pump 41 is provided in the merging flow path 62 that forms the recovery flow path 29 and the suction flow path 56, a single recovery pump 41 sucks the recovery flow path 29 and sucks the suction flow path 56. Thus, the apparatus can be reduced in size.

  As described above, the ink jet recording apparatus shown in FIG. 3 uses the two pumps of the recovery pump 41 and the supply pump 24 to perform ink and flow to the ink supply channel 23, the recovery channel 29, the solvent supply channel 45, and the suction channel 56. A solvent can be supplied.

  A residual pressure release flow path 63 is connected between the downstream side of the supply pump 24 of the ink supply flow path 23 and the recovery pump 41, and an electromagnetic valve 64 that opens and closes the residual pressure release flow path 63. Is provided. As a result, when the electromagnetic valve 64 is operated and the residual pressure release channel 63 is opened while the ink supply channel 23 is pressurized, the ink supply channel 23 is connected via the residual pressure release channel 63. The main ink container 22 is brought into communication, and the pressure in the ink supply channel 23 is released.

  A solvent replenishment flow path 65 is connected between the upstream side of the check valve 54 in the solvent supply flow path 45 and the recovery pump 41, and an electromagnetic valve 66 for opening and closing the solvent replenishment flow path 65 is provided in the solvent replenishment flow path 65. Is provided. When the electromagnetic valve 66 is opened and the recovery pump 41 is driven, the solvent in the solvent container 44 is sucked by the recovery pump 41 and supplied into the main ink container 22 through the solvent replenishment channel 65.

  FIG. 5 is a block diagram showing a control circuit 70 of the inkjet recording apparatus 10, and a control unit 71 having, for example, a microprocessor (MPU) is provided in the apparatus main body 12. An operation display unit 11 is connected to the control unit 71 via a bus line 72. The operation display unit 11 displays the operating state of the ink jet recording apparatus 10 in a lighted manner and a key provided on the operation display unit 11. By performing the operation, an operation such as setting a print character for the substrate W is performed. The control unit 71 receives output signals from the encoder 16 and the print sensor 17, and based on these signals, drive signals are sent to the nozzle 20, the charging electrode 26, and the deflection electrode 27, and the print object W is output. A printing operation is executed at a predetermined timing. Further, the liquid level sensor 30, the viscosity measuring device 34, and the pressure gauge 58 are connected to the control unit 71, and these output signals are sent to the control unit 71. A drive signal is sent from the control unit 71 to the eight solenoid valves for opening and closing the passage shown in FIG. 3 and the three-port solenoid valve 46 for switching the passage, and the supply pump 24 and the recovery pump 41 are driven. A signal is sent. The recording unit 73 stores a program for controlling the ink jet recording apparatus 10, and the control unit 71 controls each device constituting the ink jet recording apparatus 10 based on the stored program.

  FIG. 7 is a liquid path diagram in which the flow of ink and solvent in the main ink container 22 is indicated by bold lines when a printing operation is performed on the substrate W shown in FIG. is there.

  As shown in FIG. 7, when a printing operation is performed, a drive signal is sent to the three-port solenoid valve 46 to connect the ink supply channel 23 to the nozzle 20 and a drive signal is sent to the solenoid valve 31 to send the ink supply flow. The path 23 is opened. When the supply pump 24 and the recovery pump 41 are driven in this state, ink is ejected from the ejection port 21 of the nozzle 20 and a printing operation is performed on the substrate W to be printed. Ink particles 19 that have not been used for printing are captured by the gutter 28, guided to the recovery channel 29, and sent to the main ink container 22. When the printing operation is performed in this way, the pressure of the ink discharged from the supply pump 24 is applied to the ink chamber 48 in the pressure chamber 47, but the solvent supply flow path 45 is closed by the electromagnetic valve 55. As shown in FIG. 4A, the solvent chamber 49 is in an expanded state, and the solvent chamber 49 is filled with the maximum capacity of the solvent.

  When the printing operation on the substrate W is completed, the inkjet recording apparatus 10 is stopped. The stop process is performed when the operation of the belt conveyor 15 is stopped like the end time of the production line or when the printing operation is ended by temporarily stopping the belt conveyor.

  FIG. 6 is a flowchart showing the algorithm of the stop processing procedure. FIG. 8 to FIG. 14 are liquid path diagrams showing the flow of ink and solvent in each step of the stop process with bold lines.

  When the start of the stop process is input and the start of the stop process is determined in step S1 shown in FIG. 6, first, the solvent supply cleaning process in step S2 is executed as the first stop process. The stop process is started by the control unit 71 determining that the operator operates a key provided on the operation display unit 11 or that a command signal is sent from the control unit of the production line to the control unit 71. Executed.

  In the solvent supply cleaning step, as shown in FIG. 8, the supply of the drive signal to the three-port solenoid valve 46 is stopped. As a result, the communication between the ink supply channel 23 and the nozzle 20 is blocked, and the solvent supply channel 45 is in communication with the nozzle 20. Further, when the electromagnetic valve 55 provided in the solvent supply flow path 45 is driven to open the solvent supply flow path 45 and the supply pump 24 is driven, the solvent in the solvent chamber 49 in the pressure chamber 47 is transferred to the ink chamber 48. Then, the supply of the solvent to the nozzle 20 is started. At the time of switching to the step of FIG. 8 for supplying the solvent to the nozzle 20, the ink remaining between the three-port solenoid valve 46 and the nozzle 20 is pressurized from behind and pushed away by the inflowing solvent. Ink continues to be ejected from the nozzle 20, but the proportion of the ink resin and dye component in the liquid ejected from the nozzle 20 gradually decreases, and finally the solvent is almost completely switched to the solvent. This is a state in which the washing of the basin between the three-port solenoid valve 46 including the inside of the nozzle 20 and the nozzle 21 of the nozzle 20 has been completed. If this region is not washed to a clean state, the nozzle 21 at the tip of the nozzle 20 will be clogged by the remaining solid component of the ink.

  In this solvent supply cleaning step, the solvent ejected from the nozzle 20 is captured by the gutter 28 and supplied to the main ink container 22 through the recovery channel 29, so that the recovery channel 29 is also cleaned at the same time. The process is a process of cleaning the nozzle 20 and the recovery channel 29. The recovery channel 29 does not need to be carefully cleaned because there is no portion that is easily clogged like the jet nozzle 21. However, when the apparatus is stopped and the flow path is closed by the electromagnetic valve 42 with the ink phase and the air phase remaining in the recovery flow path 29 in a striped pattern, the electromagnetic valve 42 closes the apparatus main body 12 side. Since the collected flow path 29 is open to the atmosphere on the gutter 28 side, when the apparatus is stopped, the ink phase is caused by thermal expansion of the ink phase and the air phase due to changes in ambient temperature, gasification of the solvent component, and the like. Is pushed out to the side of the gutter 28 and finally flows out of the gutter 28, and the periphery of the gutter 28 is stained with ink.

  Therefore, it is necessary to suck the liquid in the recovery flow path 29 so that there is no residual liquid. However, in the ink state, the liquid is highly viscous and has a high surface tension, so that it adheres to the inner wall of the pipe serving as the flow path. End up. In this state, even if the recovery pump 41 tries to suck, it is difficult to suck because only the air sucked from the gutter 28 flows through the liquid phase. On the other hand, as shown in FIG. 8, when the nozzle 20 is cleaned, the solvent ejected from the nozzle 20 is sucked from the gutter 28 and is collected and sucked while being mixed with the ink in the collecting flow path 29. As a result, the liquid in the recovery channel 29 can be easily sucked.

  Next to the step of cleaning the nozzle 20 and the recovery channel 29, the second step of cleaning the suction channel for supplying the solvent to the suction channel 56 is the second step, as shown in FIG. This is executed as a stop processing step. In this step, when the electromagnetic valve 57 provided in the suction flow path 56 is driven to open the flow path, the solvent flows as shown by a thick line in FIG. As shown in FIG. 9, in this process, the solvent is supplied to the suction flow path 56 and the recovery flow path 29. However, in the second stop processing step shown in FIG. The flow path 29 may be closed and the solvent may be supplied only to the suction flow path 56.

  The suction flow path 56 until the second stop processing step shown in FIG. 9 is performed is filled with ink, but the suction flow from the solvent supply flow path 45 is opened by opening the electromagnetic valve 57. The solvent flows into the passage 56, and the ink is gradually diluted by the flowing solvent. When the ink density is gradually diluted from the side closer to the nozzle 20 of the suction flow path 56 and finally the flow path to the electromagnetic valve 57 becomes clean, the electromagnetic valve 57 is closed and the suction flow path 56 is closed. The method of completing the cleaning is a cleaning method that has been considered so far, but this method consumes a large amount of solvent.

  If the apparatus is stopped or stopped with the suction flow path 56 being insufficiently cleaned and the ink phase and the air phase remaining in the suction flow path 56 in a striped pattern, the apparatus main body 12 side of the suction flow path 56 will be electromagnetic. Since the flow path is sealed by the valve 57 and the nozzle 20 side is open to the atmosphere, the ink phase is on the gutter 28 side due to thermal expansion of the ink phase and air phase due to changes in ambient temperature during the pause, gasification of the solvent component, and the like. And finally flows out of the gutter 28 and stains the periphery of the gutter 28 with ink. Therefore, it is necessary to suck the suction flow path 56 so that there is no residual liquid. However, in the ink state, the viscosity is high and the surface tension is high, so that it adheres to the inner wall of the pipe serving as the flow path. In this state, even if the recovery pump 41 tries to suck the air, only the air sucked from the nozzle 20 flows through the liquid phase, so that it is difficult to suck.

  On the other hand, when the electromagnetic valve 57 is opened and the solvent is allowed to flow through the suction flow path 56 as described above and suction is performed while mixing with the ink in the flow path, the state becomes easy to be sucked due to the decrease in viscosity and surface tension. . In order to reduce the amount of solvent used for cleaning, in the step shown in FIG. 9, the amount of solvent flowing through the suction flow path 56 is limited by opening the electromagnetic valve 57. Depending on the pipe diameter of the suction channel 56 and the type of ink, in the case of a PTFE pipe tube having an inner diameter of 1 mm, the cleaning method is such that the inside of the suction channel 56 is cleaned only by flowing a solvent. Although a large amount of solvent of about 3 ml was used, by opening the solenoid valve 57 for about 1 second, about 0.5 ml is flowed, and suction is performed in combination with the execution of the next third stop processing step. It has been experimentally found that the flow path 56 can be cleaned.

  Next, the residual liquid suction cleaning shown in FIG. 10 is executed as a third stop processing step. At this time, the solvent supply flow path 45 is closed by the electromagnetic valve 55 from the state shown in FIG. 9 so that neither ink nor solvent is supplied from the primary side to the secondary side of the three-port electromagnetic valve 46. Outside air is sucked from the outlet 21 and air is allowed to flow into the suction channel 56 to suck the remaining liquid. At this time, the collection passage 29 is closed by the electromagnetic valve 42. Thereby, the solvent containing the ink in the suction flow path 56 is replaced with the outside air.

  After the residual liquid suction step shown in FIG. 10 is completed, the finish cleaning step shown in FIG. 11 is executed as the fourth stop processing step. In this finishing cleaning step, as shown in FIG. 11, the electromagnetic valve 55 of the solvent supply channel 45 is opened for a short time from the state of FIG. At this time, if the recovery pump 41 is driven to suck the suction flow path 56 without performing the contraction operation of the solvent chamber 49 by driving the supply pump 24, the solvent in the solvent container 44 is sucked through the check valve 54. It will go to the flow path 56, and a solvent will not eject from the nozzle 20. FIG. Since the solvent is supplied under the condition that the inside of the suction channel 56 is replaced with the outside air in the residual liquid suction step of FIG. About 3ml is enough.

  The cleaning method of the suction flow path 56 that has been considered so far is a method in which the solvent is continuously flowed until the cleaning of the suction flow path 56 is completed as described above. On the other hand, after supplying the solvent into the suction channel 56 in the step shown in FIG. 9, the liquid in the suction channel 56 is replaced with outside air in the residual liquid suction cleaning step shown in FIG. 10, and again shown in FIG. When the solvent is supplied to the suction channel 56 by the finish cleaning step, the amount of the solvent supplied to the suction channel 56 in the step shown in FIG. 9 and the suction channel 56 is supplied in the finish cleaning step shown in FIG. The total amount of the solvent used together with the amount of the solvent could be greatly reduced as compared with the method in which the solvent is continuously flowed to clean the inside of the suction channel 56 as described above.

  As described above, in the method of continuously flowing the solvent through the suction channel 56, it is necessary to supply at least 3 ml of the solvent. However, as in the present invention, the suction flow is performed between two solvent supply steps. By performing the process of discharging the liquid in the channel 56 and intermittently supplying the solvent via the residual liquid suction process, the suction flow path 56 can be cleaned with a very small amount of solvent. It was. That is, in the stop processing method of the present invention, about 0.5 ml of solvent is caused to flow through the suction channel 56 in the cleaning step of the suction channel 56 shown in FIG. 9, and the solvent is discharged by residual liquid suction cleaning shown in FIG. After the outside air is taken in and the liquid is replaced with air, the solvent is intermittently supplied through the outside air replacement process in which about 0.2 to 0.3 ml of solvent is supplied again in the finish cleaning process shown in FIG. As a result, the suction channel 56 could be cleaned.

  As shown in FIG. 9, in the cleaning process for supplying the solvent to the suction channel 56, since the amount of the solvent supplied is small, a small amount of liquid droplets adhering to the inner surface of the pipe of the suction channel 56 cannot be removed by suction. . However, if the solvent is supplied again after replacing the inside of the suction channel 56 with the outside air, the supplied solvent scrapes the droplets that remain attached to the inner surface of the pipe and are exposed on the inner surface. It is considered that the inside of the suction flow path 56 can be reliably cleaned with a small amount of solvent supply because it acts to drop.

  As shown in FIG. 8, when the solvent is supplied to the nozzle 20 and the recovery flow path 29 to clean them, the supply pump 24 is driven and the solvent chamber 49 is compressed by the ink chamber 48 of the pressure chamber 47 by the compression coil spring. The solvent in the solvent chamber 49 is supplied to the nozzle 20 and the recovery passageway 29 by applying pressure against the elastic force of the above. On the other hand, in the finishing cleaning step shown in FIG. 11, the recovery pump 41 is driven to bring the suction channel 56 into a negative pressure state, whereby the solvent in the solvent container 44 is transferred to the suction channel 56 via the solvent chamber 49. Since the solvent is supplied, the solvent that has passed through the three-port solenoid valve 46 at this time is not ejected from the nozzle 20, and the solvent is prevented from scattering into the print head 13. If the suction channel 56 is in a negative pressure state, outside air will also enter from the nozzle 21 of the nozzle 20, but the inner diameter of the nozzle 21 is considerably smaller than the inner diameter of the solvent supply channel 45. When the suction channel 56 is in a negative pressure state, the solvent in the solvent supply channel 45 is reliably introduced into the suction channel 56.

  In the cleaning step of the suction channel 56 shown in FIG. 9, in order to supply the solvent to the recovery channel 29, it is necessary to pressurize the solvent chamber 49 of the pressure chamber 47 by the supply pump 24. If only the flow path 56 is cleaned, the suction flow path 56 can also be cleaned by sucking the suction flow path 56 with the recovery pump 41 as in the finishing cleaning step shown in FIG.

  After the cleaning of the recovery flow path 29 and the suction flow path 56 is completed from the solvent supply cleaning process shown in FIG. 8 to the finish cleaning process shown in FIG. 11, the remaining residue in the recovery flow path 29 and the suction flow path 56 The liquid will be removed. In that case, first, the residual liquid processing of the suction channel shown in FIG. 12 is executed as the fifth stop processing step, and the residual liquid processing of the recovery channel shown in FIG. 13 is executed as the sixth stop processing step. As shown in steps S6 to S8 in FIG. 6, these processes are repeated a plurality of times.

  As shown in FIG. 12, when the solvent supply channel 45 is closed by the electromagnetic valve 55, outside air flows from the outlet 21 of the nozzle 20 by the recovery pump 41 and residual liquid in the suction channel 56 is removed. On the other hand, when the suction flow path 56 is closed by the electromagnetic valve 57 and the recovery flow path 29 is opened by the electromagnetic valve 42 as shown in FIG. Residual liquid is removed.

  In the ink jet recording apparatus in which the residual liquid is removed from the suction flow path 56 and the recovery flow path 29 by separate suction pumps, the residual liquid is removed by separate suction pumps. On the other hand, in the illustrated ink jet recording apparatus 10, the suction flow path 56 and the recovery flow path 29 are each subjected to removal of residual liquid by the recovery pump 41 provided in the merge flow path 62, so one recovery pump The residual liquid in both the suction channel 56 and the recovery channel 29 is sucked by 41.

  For this reason, if both the solenoid valve 57 that opens and closes the suction flow path 56 and the electromagnetic valve 42 that opens and closes the recovery flow path 29 are opened simultaneously, both the flow paths are sucked by separate pumps. Compared with the form of suction, the flow rate flowing through each flow path is reduced and the suction efficiency is lowered. Although the electromagnetic valves 57 and 42 arranged in each flow path are switched and only one flow path is sucked by one recovery pump 41, and the suction required can be performed by sucking another flow path after the suction is completed, Since suction can be performed only for each flow path, the stop processing time becomes long after all.

  Therefore, in order to efficiently suck the remaining liquid in the suction flow path 56 and the recovery flow path 29 without extending the stop processing time, for example, after the finish cleaning shown in FIG. Only one of the solenoid valve 42 and the solenoid valve 57 provided in the suction flow path 56 is selectively opened, and the state in which only one flow path is sucked into the recovery pump 41 is alternately switched a plurality of times. Liquid treatment is performed. When the residual liquid treatment is performed in this manner, the suction flow path 56 is in a negative pressure state equal to or lower than the atmospheric pressure in the state where the residual liquid in the suction flow path 56 is sucked, and the suction state is stopped. Since the suction state from the nozzle 20 is continued until the inside of the flow path reaches atmospheric pressure, the suction operation of the suction flow path 56 is continued even while the recovery flow path 29 is sucked. Both flow paths are sucked simultaneously. Since the opening area of the gutter 28 is considerably larger in the recovery flow path 29 than in the nozzle 20, the negative pressure in the recovery flow path 29 in the suction state does not increase, and immediately returns to atmospheric pressure after the suction stops. Therefore, in the state where only the suction channel 56 is sucked, the residual pressure suction due to the negative pressure of the recovery channel 29 cannot be performed.

  In order to remove the residual liquid in the suction flow path 56, the solvent supply flow path 45 is closed by an electromagnetic valve 55 as shown in FIG. As a result, neither the ink nor the solvent is supplied from the primary side to the secondary side of the three-port solenoid valve 46, the recovery flow path 29 is held closed by the electromagnetic valve 42, and only the suction flow path 56 is the recovery pump. 41 is in a state of being sucked. At this time, since the jet outlet 21 of the nozzle 20 has a small orifice of about 65 μm, the amount of outside air actually sucked from the jet outlet 21 with respect to the suction capability of the recovery pump 41 is reduced, so that the suction flow path 56 On the other hand, the negative pressure (degree of vacuum) near the recovery pump 41 is high while the outlet side is at atmospheric pressure because it is open to the atmosphere. Will occur. This suction state is continued until the differential pressure reaches the maximum, and when the differential pressure does not increase any more, the residual liquid removal step of the recovery channel shown in FIG. 13 is performed. The time until the differential pressure reaches the maximum is affected by the pump characteristics, but in the case of the recovery pump 41 of the normal ink jet recording apparatus, the time is maximum in a short time of 5 seconds or less. Whether the differential pressure has reached a predetermined value can be determined from the output of the pressure gauge 58 arranged in the suction flow path 56, and whether to detect that the differential pressure has been reached is detected. When the time corresponding to that time elapses, the electromagnetic valves 42 and 57 are controlled by a signal from the control unit 71 so as to shift to the residual liquid removal step of the recovery flow path 29.

  In the residual liquid removal step of the recovery channel 29, the suction channel 56 is closed by the electromagnetic valve 57 and the recovery channel 29 is opened by the electromagnetic valve 42. In this state, the recovery passageway 29 is sucked by the recovery pump 41 and, as described above, the outside air continues to be sucked from the nozzle 21 of the nozzle 20 due to the differential pressure remaining in the suction passageway 56. When the differential pressure in the suction flow path 56 becomes smaller as the outside air is sucked, the flow rate of the external air into the suction flow path 56 is reduced and finally the differential pressure becomes 0 and there is no flow.

  The time from when the residual liquid removal in the recovery flow path 29 shown in FIG. 13 is started to when the suction flow rate in the suction flow path 56 becomes 0 varies depending on the diameter of the ejection port 21, but for example, in a 65 μm nozzle Is about 10-15 seconds. Moreover, it can be determined from the output of the pressure gauge 58 arranged in the suction flow path 56 that the differential pressure has decreased, and when the differential pressure drop is detected, the residual liquid removal step of the suction flow path shown in FIG. Control to shift to

  The residual liquid treatment process shown in FIG. 12 and the residual liquid treatment process shown in FIG. 13 are alternately repeated until the residual liquid in the suction flow path 56 and the recovery flow path 29 is sufficiently sucked. By repeatedly performing the process, the residual liquid in the recovery flow path 29 can be removed in a time close to the processing time when the liquid in the suction flow path 56 is continuously removed by the recovery pump 41. The number of repetitions is obtained in advance by experiments and stored in the recording unit 73. When the set number of repetitions has been completed, the process proceeds to a residual pressure releasing process shown in FIG. 14 to release the residual pressure in the ink supply channel 23. In the residual pressure release step, as shown in FIG. 14, the residual pressure in the ink supply flow path 23 is released by opening the residual pressure release flow path 63 for several seconds with the electromagnetic valve 64.

  When a series of stop processing steps are executed in this way, the inkjet recording apparatus 10 shifts to a stop state as shown in FIG.

  In addition to the stop process described above, as means for reducing the number of pumps by efficiently sucking the remaining liquid in the suction flow path 56 and the recovery flow path 29 without extending the stop process time, for example, during printing ( The rotational speed of the recovery pump 41 during stop processing (during suction) is made larger than the rotational speed of the recovery pump 41 during ink ejection). If the number of revolutions of the pump is constantly increased, not only the pump life is shortened but also a large amount of air is sucked from the gutter 28 during printing, so that the solvent component in the ink is volatilized and the running cost increases. It becomes. Therefore, the above problem can be solved by increasing the pump speed only during the stop process. In order to make the rotation speed of the recovery pump 41 different, a DC brushless motor that can control the rotation speed by PWM control, for example, is used as the motor that drives the recovery pump 41.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the case shown in FIG. 1, the ink jet recording apparatus 10 is used for printing characters or the like on a printing material conveyed on a belt conveyor. This can also be applied when printing characters or the like.

DESCRIPTION OF SYMBOLS 10 ... Inkjet recording device, 11 ... Operation display part, 12 ... Apparatus main body, 13 ... Print head, 14 ... Conduit, 15 ... Belt conveyor, 16 ... Encoder, 17 ... Print sensor, 18 ... Ink column, 19 ... Ink particle, DESCRIPTION OF SYMBOLS 20 ... Nozzle, 21 ... Jet outlet, 22 ... Main ink container, 23 ... Ink supply flow path, 24 ... Supply pump, 25 ... Electrostrictive element, 26 ... Charge electrode, 27 ... Deflection electrode, 28 ... Gutter, 29 ... Recovery Flow path, 30 ... Liquid level sensor, 31 ... Solenoid valve, 32 ... Bypass flow path, 33 ... Solenoid valve, 34 ... Viscosity measuring device, 35 ... Filter, 36 ... Pressure reducing valve, 37 ... Auxiliary ink container, 38 ... Replenishment flow 39, solenoid valve, 41 ... recovery pump, 42 ... solenoid valve, 43 ... filter, 44 ... solvent container, 45 ... solvent supply channel, 46 ... 3-port solenoid valve, 47 ... pressure chamber, 48 ... ink chamber, 49 Solvent chamber, 50 ... partition member, 51 ... housing, 52 ... compression coil spring, 53 ... spring receiving piece, 54 ... check valve, 55 ... solenoid valve, 56 ... suction flow path, 57 ... solenoid valve, 58 ... pressure gauge , 62 ... Merge flow path, 63 ... Residual pressure release flow path, 64 ... Solenoid valve, 65 ... Solvent replenishment flow path, 66 ... Solenoid valve, 70 ... Control circuit, 71 ... Control section, 72 ... Bus line, 73 ... Recording Department.

Claims (6)

An ink supply channel that is connected between an ink container and a nozzle and supplies ink in the ink container toward the nozzle, and a solvent supply that is connected between the solvent container and the nozzle and supplies the solvent to the nozzle A flow path, a recovery path connected between the ink container for collecting ink that has not been used for printing and the ink container, and recovering the liquid recovered by the gutter in the ink container; and an inflow portion of the nozzle; A suction channel connected between the ink container and guiding the liquid to the ink container; a solvent chamber communicating with the solvent supply channel; and the solvent chamber partitioned by an elastically deformable partition member and the ink supply ink chamber is provided which communicates with the flow path, a pressure chamber having a spring member for applying an elastic force in a direction to increase the volume of the solvent chamber to the partition member, those piezoelectric A stop processing method for an ink jet recording apparatus having an electromagnetic valve for opening and closing the obtained channel provided in the solvent supply flow path is positioned downstream of the chamber,
When stopping supply of ink to the nozzle from a printing state in which ink is ejected from the nozzle, the solvent that has flowed into the solvent chamber during printing in a state where the solvent supply channel is closed by the electromagnetic valve , A solvent that opens the solenoid valve and pressurizes the ink chamber with ink supplied from the ink container by a supply pump and supplies the ink chamber to the nozzle and the recovery flow path to clean the nozzle and the recovery flow path. A supply process;
Under the state where the electromagnetic valve is opened, a suction flow path cleaning process for supplying the solvent from the solvent supply flow path to the suction flow path;
A residual liquid suction step of sucking outside air from the nozzle into the suction flow path and flowing air into the suction flow path to send the solvent in the suction flow path to the ink container;
And a finishing cleaning step of flowing a solvent from the solvent supply channel into the suction channel in a state where the inside of the suction channel is replaced with air. Processing method. In the inkjet recording apparatus stop processing method according to claim 1,
A residual liquid removal step of the suction flow path for taking outside air into the suction flow path and sending the liquid in the flow path to the ink container;
A stop processing method for an ink jet recording apparatus, wherein a residual liquid removing step of collecting the outside flow into the recovery flow path and sending the liquid in the flow path to the ink container is alternately repeated a plurality of times.   3. The stop processing method for an ink jet recording apparatus according to claim 2, wherein a pressure in the suction flow path is detected and a residual liquid removal process in the suction flow path is changed to a residual liquid removal process in the recovery flow path based on a pressure value. A stop processing method for an ink jet recording apparatus, characterized by switching.   The stop processing method for an ink jet recording apparatus according to any one of claims 1 to 3, wherein the number of rotations of the recovery pump that sucks the liquid in the recovery channel is used via the recovery channel during a printing operation. A stop processing method for an ink jet recording apparatus, characterized in that the number of rotations at the time of stop processing is increased more than the number of rotations at the time of collecting ink that has not been collected. 5. The stop processing method for an ink jet recording apparatus according to claim 1, wherein a spring member that applies an elastic force in a direction of expanding the volume of the solvent chamber is provided in the solvent chamber, and the solvent is added to the solvent chamber. when supplied to the nozzle and said recovery flow path, a pre-Symbol ink chamber is pressurized against the elastic force by supplying the solvent of the solvent chamber and the recovery flow path and the nozzle, the solvent Stopping the ink jet recording apparatus, wherein when supplying to the suction channel, the solvent in the solvent container is supplied to the suction channel via the solvent chamber by sucking the suction channel Processing method.   6. The stop processing method for an ink jet recording apparatus according to claim 1, wherein the recovery flow path and the suction flow path are merged to be provided in a merge flow path connected to the ink container. A stop processing method for an ink jet recording apparatus, wherein the recovery channel and the suction channel are suctioned by a recovery pump.

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