WO2016024455A1 - Dispositif d'enregistrement à jet d'encre et procédé de commande de température d'encre - Google Patents

Dispositif d'enregistrement à jet d'encre et procédé de commande de température d'encre Download PDF

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Publication number
WO2016024455A1
WO2016024455A1 PCT/JP2015/070216 JP2015070216W WO2016024455A1 WO 2016024455 A1 WO2016024455 A1 WO 2016024455A1 JP 2015070216 W JP2015070216 W JP 2015070216W WO 2016024455 A1 WO2016024455 A1 WO 2016024455A1
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WIPO (PCT)
Prior art keywords
temperature
ink
unit
heating
sub tank
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PCT/JP2015/070216
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English (en)
Japanese (ja)
Inventor
時松　宏行
Original Assignee
コニカミノルタ株式会社
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Application filed by コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Priority to JP2016542525A priority Critical patent/JP6822838B2/ja
Publication of WO2016024455A1 publication Critical patent/WO2016024455A1/fr

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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
    • 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
    • B41J2/195—Ink jet characterised by ink handling for monitoring ink quality

Definitions

  • the present invention relates to an ink jet recording apparatus and an ink temperature control method.
  • an ink jet recording apparatus using an ink whose viscosity changes with temperature is known (for example, see Patent Document 1).
  • an ink for example, there is an ink that is liquefied by being heated to a temperature higher than the liquefaction temperature to become a low-viscosity liquid and gelled by being cooled to a temperature lower than the gelation temperature to be high-viscosity.
  • an ink supply system for supplying ink to the ink jet head and a sub tank for temporarily storing ink are respectively used.
  • the ink was heated above the liquefaction temperature, and the ink was held above the liquefaction temperature in the ink flow path.
  • the physical properties of the ink described above are not always constant at any temperature above the liquefaction temperature, and physical properties such as viscosity and surface tension may change depending on the temperature even above the liquefaction temperature. For this reason, for each type of ink, there is a temperature (head ejection temperature) that exhibits physical properties suitable for ejection from the inkjet head, and it is preferable to adjust the ink temperature to the head ejection temperature during ink ejection.
  • an object of the present invention is to provide an ink jet recording apparatus and an ink temperature control method capable of stabilizing the temperature of ink in an ink jet head even during image formation.
  • An ink jet recording apparatus that performs image formation by discharging an ink that is liquefied at a temperature equal to or higher than a liquefying temperature and gelled at a temperature equal to or lower than the gelation temperature lower than the liquefaction temperature,
  • An inkjet head that ejects ink;
  • An ink supply system for supplying ink to the inkjet head;
  • a first heating unit for heating the ink supply system;
  • a temperature detector for detecting the temperature of ink in the ink supply system and the inkjet head, and
  • a control unit for controlling the first heating unit and the second heating unit, The control unit heats the ink supply system and the inkjet head by the first heating unit and the second heating unit, and the temperature of the ink in the ink supply system detected by the temperature detection unit is equal to or higher than the liquefaction temperature.
  • the first heating unit is controlled such that the temperature of the ink in the ink supply system
  • Invention of Claim 2 is the inkjet recording device of Claim 1, Comprising: A sub tank for storing ink supplied from an ink tank and supplying the stored ink to the ink supply system; A third heating unit for heating the sub-tank, The temperature detection unit further detects the temperature of the ink in the sub tank, The control unit further controls the third heating unit, heats the sub tank by the third heating unit, and the temperature of the ink in the sub tank detected by the temperature detection unit becomes equal to or higher than the liquefaction temperature.
  • the third heating unit is controlled such that the temperature of the ink in the sub tank detected by the temperature detection unit is higher than the gelation temperature and lower than the liquefaction temperature.
  • Invention of Claim 3 is an inkjet recording device of Claim 2, Comprising:
  • the control unit heats the sub tank by the third heating unit when the temperature of the ink in the sub tank detected by the temperature detection unit becomes equal to or lower than the gelation temperature by supplying ink to the sub tank. Then, after the temperature of the ink in the sub tank detected by the temperature detection unit becomes equal to or higher than the liquefaction temperature, the temperature of the ink in the sub tank detected by the temperature detection unit is higher than the gelation temperature and the liquefaction.
  • the third heating unit is controlled so as to be lower than the temperature.
  • Invention of Claim 4 is an inkjet recording device as described in any one of Claim 1 to 3, Comprising:
  • the control unit controls the second heating unit such that the temperature of the ink of the inkjet head detected by the temperature detection unit becomes an ink discharge temperature higher than the liquefaction temperature.
  • Invention of Claim 5 is the temperature control method of the ink in the inkjet recording device as described in any one of Claim 1 to 4, Comprising: Heating the ink supply system and the inkjet head by the first heating unit and the second heating unit, and setting the temperature of the ink in the ink supply system detected by the temperature detection unit to be equal to or higher than the liquefaction temperature; And controlling the first heating unit such that the temperature of the ink in the ink supply system detected by the temperature detection unit is higher than the gelation temperature and lower than the liquefaction temperature. .
  • an ink jet recording apparatus and an ink temperature control method that can stabilize the temperature of ink in an ink jet head even during image formation.
  • FIG. 1 is a diagram illustrating a main configuration of an ink jet recording apparatus according to an embodiment of the present invention.
  • FIG. 4 is a perspective view showing a positional relationship between an image forming drum and a cleaning unit and positions before and after movement of a head unit. It is a figure which shows an example of a structure of a head unit, Comprising: It is the schematic of the internal structure of a head unit at the time of seeing a head unit from the side. It is a figure which shows an example of a structure of a head unit, Comprising: It is the schematic of the internal structure of a head unit at the time of seeing a head unit from the recording medium side.
  • FIG. 3 is a schematic diagram illustrating a main configuration of an ink discharge mechanism and connections between respective portions of the ink discharge mechanism. It is a block diagram of an inkjet recording device. 3 is a flowchart illustrating a method for controlling the temperature of ink. It is a graph which shows the temperature transition of the ink in the inkjet head in the inkjet recording device of this invention, and the inkjet recording device of a prior art.
  • FIG. 1 is a diagram showing a main configuration of an ink jet recording apparatus 1 according to an embodiment of the present invention.
  • the inkjet recording apparatus 1 includes a paper feeding unit 10, an image forming unit 20, a paper discharge unit 30, a control unit 40 (see FIG. 7), and the like. Under the control of the control unit 40, the inkjet recording apparatus 1 conveys the recording medium P stored in the paper feeding unit 10 to the image forming unit 20, and forms an image on the recording medium P with the image forming unit 20. The formed recording medium P is discharged to the paper discharge unit 30.
  • the paper feed unit 10 includes a paper feed tray 11 that stores the recording medium P, and a transport unit 12 that transports the recording medium P from the paper feed tray 11 to the image forming unit 20.
  • the paper feed tray 11 is a plate-like member provided so that one or a plurality of recording media P can be placed thereon.
  • the paper feed tray 11 is provided so as to move up and down according to the amount of the recording medium P placed on the paper feed tray 11, and the uppermost recording medium P is transported by the transport unit 12 in the vertical movement direction. Held at a position.
  • the transport unit 12 includes a transport mechanism that transports the recording medium P on the belt 123 by driving a ring-shaped belt 123 supported by a plurality of (for example, two) rollers 121 and 122 on the inner side, and a paper feed tray 11.
  • a supply unit that transfers the uppermost recording medium P placed on the belt 123 onto the belt 123.
  • the transport unit 12 transports the recording medium P transferred from the supply unit onto the belt 123 so as to follow the belt 123.
  • the image forming unit 20 includes an image forming drum 21 that carries the recording medium P along a cylindrical outer peripheral surface, and a transfer unit that transfers the recording medium P conveyed by the conveying unit 12 of the paper feeding unit 10 to the image forming drum 21. 22.
  • a sheet heating unit 23 for heating the recording medium P carried on the image forming drum 21; a head unit 24 for ejecting ink onto the recording medium P carried on the image forming drum 21;
  • An irradiation unit 25 that irradiates an energy beam for curing the ink ejected on the head, a delivery unit 26 that transports the recording medium P irradiated by the irradiation unit 25 from the image forming drum 21 to the paper discharge unit 30, and a head unit 24.
  • a cleaning unit 27 (see FIG. 2) for receiving ink ejected from the head unit 24 during maintenance.
  • FIG. 2 is a perspective view showing the positional relationship between the image forming drum 21 and the cleaning unit 27 and the position of the head unit 24 before and after movement.
  • the image forming drum 21 includes a claw portion 211 and an intake portion 212 for carrying the recording medium P on the outer peripheral surface thereof.
  • the claw portion 211 has a plurality of claws provided along a rotation axis direction (X direction) of the cylindrical image forming drum 21 at a predetermined position on the outer peripheral surface of the image forming drum 21. .
  • the claw portion 211 sandwiches and supports the vicinity of one side of the recording medium P in cooperation with the outer peripheral surface of the image forming drum 21.
  • the air intake portion 212 includes a plurality of air intake holes provided on the outer peripheral surface of the image forming drum 21 along which the recording medium P supported by the claw portion 211 and the vicinity of one side thereof, and the air intake holes.
  • a suction force generator (not shown) (for example, an air pump or a fan) that generates a suction force so as to suck the gas into the image forming drum 21.
  • the suction unit 212 sucks the recording medium P along the outer peripheral surface of the image forming drum 21 by the suction force generated by the suction from the suction hole.
  • FIG. 2 a part of the recording medium P is turned up from the outer peripheral surface of the image forming drum 21, but this is for the purpose of illustrating the intake holes, and image formation by the image forming unit 20 is performed. Sometimes, the entire recording medium P is carried along the outer peripheral surface of the image forming drum 21.
  • the delivery unit 22 is provided at a position interposed between the transport unit 12 of the paper feeding unit 10 and the image forming drum 21.
  • the delivery unit 22 includes a claw part 221 that supports one end of the recording medium P conveyed by the conveyance part 12, a cylindrical delivery drum 222 that guides the recording medium P carried by the claw part 221, and the like.
  • the recording medium P on the portion 12 is picked up by the claw portion 221 and is moved along the outer peripheral surface of the transfer drum 222 to guide the recording medium P in the direction along the outer peripheral surface of the image forming drum 21 and transfer it to the image forming drum 21. .
  • the paper heating unit 23 includes, for example, a heating wire and generates heat in response to energization.
  • the sheet heating unit 23 is provided in the vicinity of the outer peripheral surface of the image forming drum 21 and on the upstream side of the head unit 24 in the conveyance direction of the recording medium P by the rotation of the image forming drum 21. Heat generation of the sheet heating unit 23 is controlled by the control unit 40 so that the recording medium P carried on the image forming drum 21 and passing through the vicinity of the sheet heating unit 23 has a predetermined temperature.
  • a temperature sensor (not shown) is provided in the vicinity of the paper heating unit 23. Based on the temperature in the vicinity of the paper heating unit 23 detected by the temperature sensor, the control unit 40 causes the recording medium P carried on the image forming drum 21 and passing through the vicinity of the paper heating unit 23 to have a predetermined temperature. The operation of the paper heating unit 23 is controlled.
  • FIG. 3A and 3B are diagrams showing the internal configuration of the head unit 24.
  • FIG. FIG. 3A is a schematic diagram of an internal configuration when the head unit 24 is viewed from the side.
  • FIG. 3B is a schematic diagram of an internal configuration when the head unit 24 is viewed from the recording medium side.
  • the case when viewed from the side indicates a case where the head unit 24 is viewed with the front surface of one side of the head unit 24 along the vertical direction and the X direction of the head unit 24.
  • the head unit 24 is disposed along the outer peripheral surface of the image forming drum 21 at a predetermined distance from the image forming drum 21. As shown in FIGS. 3A and 3B, the head unit 24 includes a plurality of inkjet heads 241.
  • Each inkjet head 241 has a plurality of nozzles 2411.
  • the ink jet head 241 ejects ink from a plurality of nozzles 2411 to form an image on the recording medium P carried on the image forming drum 21. That is, the inkjet head 241 is provided such that the plurality of nozzles 2411 are exposed on the lower surface side of the head unit 24.
  • the inkjet head 241 illustrated in FIG. 3B includes a plurality of nozzles 2411 arranged in two rows of nozzles along the X direction.
  • the plurality of inkjet heads 241 includes two inkjet heads 241 as a set, and each set of inkjet heads 241 forms a row of inkjet heads 241 provided in the X direction. Has been placed. Further, a plurality of rows of the inkjet heads 241 are provided, and the positional relationship between the pairs of the inkjet heads 241 in adjacent rows is arranged in a staggered manner in the direction orthogonal to the X direction.
  • the head units 24 are provided so as to be individually movable along the X direction. Specifically, as shown in FIG. 2, the head unit 24 is provided so as to be movable between a position between the image forming drum 21 and the cleaning unit 27 provided so as to be arranged in the X direction. Under the control of the control unit 40, the head unit 24 moves to a position where the lower surface faces the image forming drum 21 during image formation, and the lower surface moves to a position facing the cleaning unit 27 during various maintenance. Moving.
  • the head unit 24 is individually provided for each color (CMYK) used for image formation.
  • CYK color used for image formation.
  • a head unit 24 corresponding to each color is provided.
  • the width of the head unit 24 in the X direction is provided so as to sufficiently cover the width of the recording medium P carried and transported by the image forming drum 21 in the X direction.
  • the position of the head unit 24 is fixed with respect to the image forming drum 21.
  • the inkjet recording apparatus 1 is a one-pass inkjet recording apparatus, and the head unit 24 includes a plurality of nozzles 2411 of a plurality of inkjet heads 241 arranged side by side along the X direction.
  • the number is set according to the maximum width of the recording medium P.
  • the ink used in the inkjet recording apparatus 1 of the present invention has a property of phase change depending on the temperature of the ink. Specifically, the ink changes in phase from gel or solid to liquid depending on the temperature.
  • the composition of such an ink include an ink composition in which several percent of a gelling agent is added to a composition mainly composed of a polymerizable compound and a photopolymerization initiator.
  • composition after filtering with the Teflon (trademark) 3 micrometer membrane filter by ADVATEC is obtained with respect to the composition shown in Table 1 as an ink.
  • FIG. 4 shows an example of changes in the viscosity of the ink as the ink temperature rises and falls.
  • a line L1 shown in FIG. 4 shows an example of a change in ink viscosity when the temperature rises
  • a line L2 shows an example of a change in ink viscosity when the temperature falls.
  • the ink undergoes a phase change in which the viscosity changes remarkably around 60 ° C. when the temperature rises. Specifically, an ink that was in a gel or solid state at a temperature lower than 60 ° C. becomes a liquid with a markedly reduced viscosity from around 60 ° C. due to the temperature increase.
  • the temperature around 60 ° C. is the liquefaction temperature.
  • the ink undergoes a phase change in which the viscosity changes more remarkably than the phase change at the time of temperature rise at about 45 ° C. when the temperature is lowered.
  • an ink that has been kept in a liquid state to a temperature exceeding 45 ° C. has a very marked increase in viscosity when it falls below 45 ° C. due to a temperature drop, and becomes a gel or solid.
  • the gelling temperature is around 45 ° C.
  • the ink is stored in the storage unit 242 and the sub tank 243 in the head unit 24.
  • a mechanism for supplying ink from the storage unit 242 and the sub tank 243 to the inkjet head 241 will be described later.
  • the irradiation unit 25 includes, for example, a fluorescent tube such as a low-pressure mercury lamp, and irradiates energy rays such as ultraviolet rays by light emitted from the fluorescent tube.
  • the irradiation unit 25 is provided in the vicinity of the outer peripheral surface of the image forming drum 21 and on the downstream side of the head unit 24 in the conveyance direction of the recording medium P by the rotation of the image forming drum 21.
  • the irradiation unit 25 irradiates the recording medium P carried on the image forming drum 21 and ejects the ink with an energy ray, and cures the ink on the recording medium P by the action of the energy ray.
  • the fluorescent tube emitting ultraviolet rays is not limited to a low-pressure mercury lamp, but a mercury lamp having an operating pressure of several hundred Pa to 1 MPa, a light source usable as a germicidal lamp, a cold cathode tube, an ultraviolet laser light source, a metal halide lamp, a light emitting diode.
  • the light source is a power-saving light source (for example, a light emitting diode) that can irradiate ultraviolet rays with higher illuminance.
  • the energy rays are not limited to ultraviolet rays, but may be any energy rays having a property of curing ink according to the properties of the ink, and the light source is replaced according to the energy rays.
  • the delivery unit 26 drives a ring-shaped belt 263 supported by a plurality of (for example, two) rollers 261 and 262 on the inner side, and conveys the recording medium P on the belt 263, and the recording medium P as an image. It has a cylindrical delivery roller 264 and the like that delivers from the forming drum 21 to the transport mechanism. The delivery unit 26 conveys the recording medium P transferred on the belt 263 by the transfer roller 264 so as to be along the belt 263 and sends it to the paper discharge unit 30.
  • the cleaning unit 27 includes a waste ink unit (not shown) that receives and stores ink discharged from the head unit 24 during maintenance, and the ink discharged from the head unit 24 during maintenance in the image forming unit 20 To prevent fouling.
  • the paper discharge unit 30 includes a plate-shaped paper discharge tray 31 on which the recording medium P sent out from the image forming unit 20 by the delivery unit 26 is placed, and the recording medium P after image formation is taken out by the user. Store up to.
  • the ink ejection mechanism 300 refers to a mechanism related to an operation of ejecting ink from the plurality of nozzles 2411 of the inkjet head 241, and includes a mechanism for supplying ink from the storage unit 242 and the sub tank 243 to the inkjet head 241.
  • FIG. 5 is a side view of the inkjet head 241.
  • the side surface referred to here is a surface along one side surface of the head unit 24 described above.
  • the inkjet head 241 includes an upper channel portion 2412 and a lower channel portion 2413 that function as a channel for ink ejected from the inkjet head 241, and an upper channel portion 2412 and a lower channel portion 2413.
  • the upper flow path portion 2412 and the lower flow path portion 2413 each have a flow path for guiding the ink supplied to each of the plurality of nozzles of the inkjet head 241 to the nozzle.
  • the flow path is a common flow path shared by a plurality of nozzles, and guides the ink flowing through the inlet 2414. That is, the ink supplied from the inlet 2414 flows through the flow paths in the upper flow path portion 2412 and the lower flow path portion 2413 and reaches a plurality of nozzles 2411.
  • the common flow path in the upper flow path portion 2412 is also connected to the outlet 2415. That is, the ink flowing through the upper flow path portion 2412 can flow out to the outlet 2415 side.
  • the common flow path in the lower flow path portion 2413 is also connected to the bypass portion 2416. That is, the ink flowing through the lower flow path portion 2413 can also flow out to the bypass portion 2416 side.
  • a filter 2417 is provided between the upper flow path portion 2412 and the lower flow path portion 2413. As a result, the ink flowing from the upper flow path portion 2412 to the lower flow path portion 2413 is filtered by the filter 2417.
  • a pressure chamber 2418 is provided in the vicinity of the nozzle surface below the lower flow path portion 2413. Under the control of the control unit 40, the pressure chamber 2418 applies pressure to the nozzle corresponding to the ink ejected according to the image formed on the recording medium P, and ejects the ink.
  • the ink jet head 241 has a head control unit 2419.
  • the head control unit 2419 is provided, for example, above the upper flow path unit 2412, and controls the operation of the pressure chamber 2418 under the control of the control unit 40.
  • the inkjet head 241 has a second heating unit 2401.
  • the 2nd heating part 2401 has a heating wire etc., for example, and generates heat according to energization.
  • the second heating unit 2401 heats the ink in the inkjet head 241 by heating the inkjet head 241.
  • the ink jet head 241 has a temperature detection unit 2402.
  • the control unit 40 controls the operation of the second heating unit 2401 based on the average value of the temperatures detected by the temperature detection units 2402 provided at six locations of the inkjet head 241.
  • the temperature detection unit 2402 is provided on the outer surface of the inkjet head 241 and detects the temperature of the inkjet head 241, but the control unit 40 determines the temperature detected by the temperature detection unit 2402.
  • the operation of the second heating unit 2401 is controlled assuming that the temperature of the ink is inside. However, when the difference in ink temperature is large, it is also possible to measure the difference from the ink temperature in advance and correct it for control.
  • FIG. 6 is a schematic diagram showing the main configuration of the ink ejection mechanism 300 and the connections between the respective parts of the ink ejection mechanism 300.
  • the ink ejection mechanism 300 includes an ink tank 244 that stores ink, a sub tank 243 that stores ink supplied from the ink tank 244, a storage unit 242 that stores ink supplied from the sub tank 243, and ink supplied from the storage unit 242.
  • the ink jet head 241 for discharging the ink the pressure control unit 305 for setting the nozzle 2411 of the ink jet head 241 to a negative pressure, the path 304 for connecting the ink tank 244 and the sub tank 243, the path 303 for connecting the sub tank 243 and the storage part 242, and the storage
  • the ink supply system 320 is configured by the path 303, the storage unit 242, and the supply path 301.
  • each path serving as an ink path is indicated by a broken line or the like, but the specific configuration of each path according to these descriptions is a closed path for conducting ink.
  • the ink tank 244 stores the ink circulated to each part of the ink discharge mechanism 300 and supplies the stored ink to the sub tank 243.
  • the sub tank 243 stores the ink supplied from the ink tank 244 and supplies the stored ink to the storage unit 242.
  • the sub tank 243 is provided with a third heating unit 2431.
  • the 3rd heating part 2431 has a heating wire etc., for example, and generates heat according to energization.
  • the third heating unit 2431 heats the ink in the sub tank 243 by heating the sub tank 243. Since the non-heated ink is supplied from the ink tank 244 to the sub tank 243, the supply speed of the non-heated ink may increase depending on the ink consumption speed at the time of image formation, and the temperature in the sub tank 243 may greatly decrease.
  • the sub tank 243 is provided with a temperature detector 2432.
  • the control unit 40 controls the operation of the third heating unit 2431 based on the temperature of the sub tank 243 detected by the temperature detection unit 2432.
  • the temperature detection unit 2432 is provided on the outer surface of the sub tank 243 and detects the temperature of the sub tank 243, but the control unit 40 determines the temperature detected by the temperature detection unit 2432 as ink in the sub tank 243.
  • the operation of the third heating unit 2431 is controlled as the temperature of The outer surface temperature and the ink temperature are substantially the same, but there may be a difference immediately after the normal temperature ink is supplied. For this reason, it is preferable to use a liquid contact detection unit that directly detects the ink temperature.
  • the storage unit 242 stores the ink supplied from the sub tank 243 and supplies the stored ink to the inkjet head 241.
  • the storage unit 242 is provided with a first heating unit 2421.
  • the 1st heating part 2421 has a heating wire etc., for example, and generates heat according to energization.
  • the first heating unit 2421 heats the ink in the storage unit 242 by heating the storage unit 242.
  • the storage unit 242 is supplied with ink liquefied in the sub tank 243.
  • the storage unit 242 is provided with a temperature detection unit 2422.
  • the control unit 40 controls the operation of the first heating unit 2421 based on the temperature of the storage unit 242 detected by the temperature detection unit 2422.
  • the temperature detection unit 2422 is provided on the outer surface of the storage unit 242, and detects the temperature of the storage unit 242, but the control unit 40 determines the temperature detected by the temperature detection unit 2422.
  • the operation of the first heating unit 2421 is controlled as the temperature of the ink inside.
  • the pressure control unit 305 is connected to the storage unit 242 and adjusts the pressure in the storage unit 242 under the control of the control unit 40. As a result, the pressure control unit 305 sets the pressure of the nozzle 2411 of the inkjet head 241 to a negative pressure state via the storage unit 242 and the supply path 301. This prevents ink from leaking from the nozzles when image formation and various maintenance are not performed.
  • the supply path 301, the recovery path 302, and the paths 303 and 304 are tube-like members through which ink passes, and are made of, for example, resin or the like or a member having good heat conductivity.
  • the path 304 connects the sub tank 243 and the ink tank 244, and the path 304 is provided with a pump P2.
  • the pump P ⁇ b> 2 operates under the control of the control unit 40 and supplies ink from the ink tank 244 to the sub tank 243.
  • a positive displacement pump such as a diaphragm pump, a tube pump, or the like is used as the pump P2.
  • the path 303 connects the storage unit 242 and the sub tank 243, and the path 303 is provided with a pump P1.
  • the pump P ⁇ b> 1 operates under the control of the control unit 40 and supplies ink from the sub tank 243 to the storage unit 242.
  • a positive displacement pump such as a diaphragm pump, a tube pump, or the like is used as the pump P1.
  • the supply path 301 connects the inlet 2414 of the inkjet head 241 and the storage unit 242.
  • a first heating unit 3011 is provided in the supply path 301.
  • the 1st heating part 3011 has a heating wire etc., for example, and generates heat according to energization.
  • the first heating unit 3011 heats the ink passing through the supply path 301 by heating the supply path 301.
  • the supply path 301 is provided with a temperature detection unit 3012.
  • the control unit 40 controls the operation of the first heating unit 3011 based on the temperature of the supply path 301 detected by the temperature detection unit 3012.
  • the temperature detection unit 3012 is provided on the outer surface of the supply path 301 and detects the temperature of the supply path 301, but the control unit 40 detects the temperature detected by the temperature detection unit 3012.
  • the operation of the first heating unit 3011 is controlled on the assumption that the temperature of the ink is inside.
  • the collection path 302 connects the inkjet head 241 and the sub tank 243.
  • the first recovery path 3021 and the second recovery path 3022 connected to the outlet 2415 and the bypass unit 2416 of the inkjet head 241 are joined to one common recovery path 3023 and connected to the sub tank 243. It has a structure.
  • a recovery path heating unit 3024 is provided in the recovery path 302.
  • the recovery path heating unit 3024 has, for example, a heating wire and generates heat in response to energization.
  • the recovery path heating unit 3024 heats the ink passing through the recovery path 302 by heating the recovery path 302.
  • a recovery path temperature detection unit 3025 is provided in the recovery path 302.
  • the control unit 40 controls the operation of the recovery path heating unit 3024 based on the temperature of the recovery path 302 detected by the recovery path temperature detection unit 3025.
  • the recovery path temperature detection unit 3025 is provided on the outer surface of the recovery path 302 and detects the temperature of the recovery path 302, but the control unit 40 detects the temperature detected by the recovery path temperature detection unit 3025. Is the temperature of the ink in the recovery path 302, and the operation of the recovery path heating unit 3024 is controlled.
  • the air passage 306 connects the storage unit 242 and the pressure control unit 305.
  • the air passage 306 is a tube-shaped member through which air passes, and is made of, for example, resin.
  • the air passage 306 has a structure that branches from one common air passage 3061 connected to the pressure control unit 305 to a plurality of branch air passages 3062 connected to each of the plurality of storage units 242.
  • electromagnetic valves 307, 308, 309, and 310 are provided in the first recovery path 3021, the second recovery path 3022, the path 303, and the branch ventilation path 3062, respectively.
  • the electromagnetic valves 307 to 310 open and close the ink flow path and the air flow path provided under the control of the control unit 40. That is, the electromagnetic valve 307 provided in the first recovery path 3021 and the electromagnetic valve 308 provided in the second recovery path 3022 switch opening and closing of the recovery path 302.
  • a solenoid valve 309 provided between the sub tank 243 and the pump P1 in the path 303 switches between opening and closing of the connection between the sub tank 243 and the pump P1.
  • the electromagnetic valve 310 provided in the branch ventilation path 3062 switches between opening and closing of the connection between the storage unit 242 and the pressure control unit 305.
  • the storage unit 242 is a tank-like container that is sealed except for the various connection points described above. That is, the pressure in the storage unit 242 varies depending on the degree of negative pressure applied by the pressure control unit 305, the presence or absence of ink supply from the sub tank 243, and the like. For example, when the supply of ink from the sub tank 243 is received in a state where the electromagnetic valve 310 is closed and the negative pressure applied by the pressure control unit 305 is lost, the ink amount in the storage unit 242 increases. The pressure in the reservoir 242 increases.
  • the sub-tank 243 is a container opened to the outside, and is maintained at substantially atmospheric pressure regardless of increase or decrease in the amount of ink.
  • FIG. 7 is a block diagram of the inkjet recording apparatus 1.
  • the control unit 40 is connected to each part constituting the ink jet recording apparatus 1 and controls each part constituting the ink jet recording apparatus 1.
  • the control unit 40 includes a CPU 41, a RAM 42, a ROM 43, and the like.
  • the CPU 41 reads out and executes various programs, data, and the like corresponding to the processing contents from a storage device such as the ROM 43, and controls the operation of each unit of the inkjet recording apparatus 1 according to the executed processing contents.
  • the RAM 42 temporarily stores various programs and data processed by the CPU 41.
  • the ROM 43 stores various programs and data read by the CPU 41 and the like.
  • control unit 40 heats the ink supply system 320, the inkjet head 241 and the sub tank 243 by the first heating units 2421 and 3011, the second heating unit 2401 and the third heating unit 2431, and the temperature detection unit 2402, Ink supply systems detected by the temperature detection units 2402, 2422, 2432, and 3012 after the ink temperatures of the ink supply system 320, the inkjet head 241 and the sub tank 243 detected by the temperature detection units 2422, 2432, and 3012 are equal to or higher than the liquefaction temperature.
  • the first heating units 2421 and 3011 and the third heating unit 2431 are controlled so that the temperature of the ink in 320 and the sub tank 243 is higher than the gelation temperature and lower than the liquefaction temperature.
  • control unit 40 detects the ink supply system 320 detected by the temperature detection units 2402, 2422, and 3012 and the ink jet head detected by the temperature detection unit 2402 after the ink temperature of the ink jet head 241 becomes equal to or higher than the liquefaction temperature.
  • the second heating unit 2401 is controlled so that the temperature of the ink 241 becomes an ink discharge temperature higher than the liquefaction temperature.
  • the ink discharge temperature is an ink temperature that exhibits the most suitable physical properties (viscosity, surface tension, etc.) for discharging ink from the inkjet head 241 and is a value set in advance for each type of ink. .
  • the control unit 40 causes the third heating unit 2431 to set the sub tank 243. After the heating and the temperature of the ink in the sub tank 243 detected by the temperature detection unit 2432 becomes equal to or higher than the liquefaction temperature, the temperature of the ink in the sub tank 243 detected by the temperature detection unit 2432 is higher than the gelation temperature and lower than the liquefaction temperature.
  • the third heating unit 2431 is controlled so that
  • FIG. 8 is a flowchart illustrating an example of the ink temperature control process.
  • control unit 40 determines whether the user has turned on the power of the inkjet recording apparatus 1 (step S101). When it is determined that the power of the inkjet recording apparatus 1 is not turned on (step S101; NO), the control unit 40 performs the process of step S101 again.
  • the control unit 40 causes the ink temperatures of the ink supply system 320, the ink jet head 241, and the sub tank 243 to be equal to or higher than the liquefaction temperature.
  • the first heating units 2421 and 3011, the second heating unit 2401 and the third heating unit 2431 are controlled (step S102).
  • the fluidity of the ink is increased, and the ink can be smoothly fed in the ink ejection mechanism 300.
  • the ink liquefaction temperature has a unique value depending on the type of ink, and the specific value is stored in the control unit 40 in advance.
  • the control unit 40 determines whether or not the temperature of the ink in the ink supply system 320, the inkjet head 241 and the sub tank 243 detected by the temperature detection units 2402, 2422, 2432, and 3012 is equal to or higher than the liquefaction temperature (Ste S103). If it is determined that the ink temperatures of the ink supply system 320, the inkjet head 241 and the sub tank 243 are not equal to or higher than the liquefaction temperature (step S103; NO), the control unit 40 performs the process of step S103 again.
  • step S103 when it is determined that the ink temperatures of the ink supply system 320, the ink jet head 241 and the sub tank 243 have become equal to or higher than the liquefaction temperature (step S103; YES), the control unit 40 is detected by the temperature detection units 2422, 2432 and 3012.
  • the first heating units 2421 and 3021 and the third heating unit 2431 are controlled so that the temperature of the ink in the ink supply system 320 and the sub tank 243 is higher than the gelation temperature and lower than the liquefaction temperature (step S104).
  • the amount of heat generated by the first heating units 2421 and 3021 and the third heating unit 2431 can be reduced, and the power cost in ink temperature control can be reduced.
  • the gelation temperature of the ink has a unique value depending on the type of ink, and the specific value is stored in the control unit 40 in advance.
  • control unit 40 controls the recovery path heating unit 3024 so that the temperature of the ink in the recovery path 302 detected by the recovery path temperature detection unit 3025 is higher than the gelation temperature and lower than the liquefaction temperature. .
  • the amount of heat generated by the recovery path heating unit 3024 can also be reduced, and the power cost in ink temperature control can be further reduced.
  • the control unit 40 controls the second heating unit 2401 so that the ink temperature of the inkjet head 241 becomes the ink discharge temperature (step S105).
  • the ink discharge temperature is a value set in advance for each type of ink as described above, and the specific value is stored in the control unit 40 in advance.
  • the control unit 40 determines that the ink temperatures in the ink supply system 320, the inkjet head 241 and the sub tank 243 are equal to or higher than the liquefaction temperature, and then performs the process in step S105. It is good also as what performs a process.
  • step S103 when it is determined that the temperature of the ink in the ink supply system 320, the inkjet head 241 and the sub tank 243 is equal to or higher than the liquefaction temperature, steps S104 and S105 are performed in order.
  • the first heating units 2421 and 3011 are controlled so that the temperature of the ink in the ink supply system 320 is higher than the gelation temperature and lower than the liquefaction temperature. It is good as a thing.
  • the second heating unit 2401 may be controlled so that the temperature of the ink of the inkjet head 241 becomes the ink discharge temperature when it is determined that the temperature of the ink of the inkjet head 241 has become equal to or higher than the liquefaction temperature. Further, when it is determined that the temperature of the ink in the sub tank 243 is equal to or higher than the liquefaction temperature, the third heating unit 2431 is controlled so that the temperature of the ink in the sub tank 243 is higher than the gelation temperature and lower than the liquefaction temperature. It is also good. As described above, the first to third heating units 2401, 2421, 2431, and 3011 may be individually controlled in an arbitrary order.
  • the control unit 40 controls each unit constituting the inkjet recording apparatus 1 to start image formation (step S106).
  • the control unit 40 controls the control unit 40, during the image formation, the first heating unit 2421, 3021 and the third heating unit so that the temperature of the ink in the ink supply system 320 and the sub tank 243 is higher than the gelation temperature and lower than the liquefaction temperature. 2431 is controlled, and the second heating unit 2401 is controlled so that the ink temperature of the inkjet head 241 becomes the ink discharge temperature.
  • the control unit 40 determines whether or not the temperature of the ink in the sub tank 243 detected by the temperature detection unit 2432 is equal to or lower than the gelation temperature (step S107). As a result, when the amount of ink consumed by image formation is large and the amount of ink flowing into the sub tank 243 is large, it is detected at an early stage whether or not the temperature of the ink in the sub tank 243 has become equal to or lower than the gelation temperature. The ink fluidity at 300 is prevented from being lowered. When it is determined that the temperature of the ink in the sub tank 243 is not equal to or lower than the gelation temperature (step S107; NO), the control unit 40 performs a process of step S111 described later.
  • step S107 when it is determined that the temperature of the ink in the sub tank 243 is equal to or lower than the gelation temperature (step S107; YES), the control unit 40 detects that the temperature of the ink in the sub tank 243 detected by the temperature detection unit 2432 is equal to or higher than the liquefaction temperature.
  • the third heating unit 2431 is controlled so as to become (step S108).
  • control unit 40 determines whether or not the temperature of the ink in the sub tank 243 detected by the temperature detection unit 2432 is equal to or higher than the liquefaction temperature (step S109). When it is determined that the temperature of the ink in the sub tank 243 is not equal to or higher than the liquefaction temperature (step S109; NO), the control unit 40 performs the process of step S109 again.
  • step S109 when it is determined that the temperature of the ink in the sub tank 243 is equal to or higher than the liquefaction temperature (step S109; YES), the control unit 40 determines that the temperature of the ink in the sub tank 243 detected by the temperature detection unit 2432 is higher than the gelation temperature.
  • the third heating unit 2431 is controlled to be larger and lower than the liquefaction temperature (step S110).
  • control unit 40 determines whether or not to end image formation (step S111). If it is determined not to end the image formation (step S111; NO), the control unit 40 performs the process of step S107 again. As described above, the control unit 40 repeats the processes of steps S107 to S111 until the image formation is completed.
  • step S111 if it is determined that the image formation is to be terminated (step S111; YES), the control unit 40 stops heating by the first to third heating units 2401, 2421, 2431, 3011 (step S112). In this manner, the ink temperature control process is performed.
  • control of the first to third heating units 2401, 2421, 2431, and 3011 is started immediately after the inkjet recording apparatus 1 is turned on.
  • the present invention is not limited to this. Instead, it may start at any time before the start of image formation.
  • the second heating unit 2401 is controlled so that the temperature of the inkjet head 241 becomes equal to or higher than the liquefaction temperature in step S102, and the temperature of the inkjet head 241 becomes the ink discharge temperature in step S105.
  • 2 heating part 2401 was controlled, it is not restricted to this.
  • the second heating unit 2401 may be controlled so that the temperature of the inkjet head 241 becomes the ink discharge temperature in step S102, and the process in step S105 may be omitted.
  • the temperature control process it is determined in step S103 whether or not the temperature of the ink in the ink supply system 320, the inkjet head 241 and the sub tank 243 is equal to or higher than the liquefaction temperature. It may be determined whether or not the temperature of the ink at 243 is equal to or higher than the liquefaction temperature.
  • step S104 the temperature of the ink in the recovery path 302 detected by the recovery path temperature detection unit 3025 is higher than the gelling temperature together with the temperature control of the ink in the ink supply system 320 and the sub tank 243.
  • the recovery path heating unit 3024 is controlled so as to be lower than the liquefaction temperature, the recovery path heating unit 3024 may be controlled so that the temperature of the ink in the recovery path 302 is equal to or higher than the liquefaction temperature. Further, the temperature control of the ink in the recovery path 302 may not be performed.
  • the control unit 40 heats the ink supply system 320 and the inkjet head 241 with the first heating units 2421 and 3011 and the second heating unit 2401, and the ink supply system 320 and the inkjet head. Since the first heating units 2421 and 3011 are controlled so that the temperature of the ink in the ink supply system 320 is higher than the gelation temperature and lower than the liquefaction temperature after the temperature of the ink 241 becomes equal to or higher than the liquefaction temperature, the inkjet head The temperature of the ink supplied to 241 can be set to a low temperature that can maintain fluidity.
  • the temperature of the ink in the inkjet head 241 can be suppressed from being excessively increased, and the ink in the inkjet head 241 can also be formed during image formation.
  • the temperature can be stabilized. As a result, it is possible to continuously form an image without causing ink ejection failure or image deterioration, and it is not necessary to stop the image formation in order to cool the ink whose temperature has become too high. Can be shortened.
  • the first heating units 2401 and 3011 are controlled so that the temperature of the ink in the ink supply system 320 is higher than the gelation temperature and lower than the liquefaction temperature, the amount of heat generated by the first heating units 2401 and 3011 can be reduced. In addition, it is possible to reduce the power cost in the ink temperature control accompanying the image formation.
  • a sub tank 243 and a third heating unit 2431 are further provided, and the control unit 40 heats the ink supply system 320, the inkjet head 241 and the sub tank 243 by the first to third heating units 2401, 2421, 2431 and 3011, After the temperature of the ink in the ink supply system 320, the inkjet head 241 and the sub tank 243 becomes equal to or higher than the liquefaction temperature, the temperature of the ink in the ink supply system 320 and the sub tank 243 is higher than the gelation temperature and lower than the liquefaction temperature. Since the first heating units 2401 and 3011 and the third heating unit 2431 are controlled, the temperature of the ink in the inkjet head 241 can be more reliably stabilized.
  • the third heating unit 2431 is controlled so that the temperature of the ink in the sub tank 243 is higher than the gelation temperature and lower than the liquefaction temperature, the amount of heat generated by the third heating unit 2431 can be reduced, and the power cost is further increased. Can be reduced.
  • the control unit 40 heats the sub tank 243 by the third heating unit 2431, and the temperature of the ink in the sub tank 243 is liquefied. After the temperature exceeds the temperature, the third heating unit 2431 is controlled so that the temperature of the ink in the sub tank 243 is higher than the gelation temperature and lower than the liquefaction temperature. Even when the temperature of the ink in the sub tank 243 becomes equal to or lower than the gelation temperature due to the increase in the ink inflow amount, the sub tank 243 can be quickly heated to increase the fluidity of the ink.
  • control unit 40 controls the second heating unit 2401 so that the ink temperature of the inkjet head 241 becomes an ink discharge temperature higher than the liquefaction temperature after the temperature of the ink of the inkjet head 241 becomes equal to or higher than the liquefaction temperature. Therefore, the ink supplied to the inkjet head 241 can be heated to start image formation promptly.
  • the ink ejection mechanism 300 includes the sub tank 243.
  • the ink discharge mechanism 300 may not include the sub tank 243.
  • the ink ejection mechanism 300 does not include the third heating unit 2431 and the temperature detection unit 2432, and the control unit 40 does not control the third heating unit 2431.
  • the temperature detection units 2402, 2422, 2432, 3012 and the recovery path temperature detection unit 3025 sensors that are not in contact with ink are used, but sensors that are in contact with ink are used. It is good as a thing. In this case, temperature control with higher accuracy can be performed. In particular, since ink at normal temperature is supplied to the sub tank 243, a sensor that contacts the ink or a combination thereof is preferable.
  • the temperature transition of the ink in the ink jet head was measured using the ink jet recording apparatus 1 of the present invention configured as described above and the ink jet recording apparatus of the prior art.
  • an ink having a gelation temperature of 45 ° C., a liquefaction temperature of 65 ° C., and an ink discharge temperature of 70 ° C. was used.
  • the first heating units 2421 and 3011 and the third heating are performed so that the temperature of the ink in the ink supply system 320 and the sub tank 243 is higher than the gelation temperature and lower than the liquefaction temperature, that is, 60 ° C. It is assumed that the part 2431 is controlled and the second heating part 2401 is controlled such that the temperature of the ink in the inkjet head 241 is 70 ° C.
  • the prior art ink jet recording apparatus has substantially the same configuration as that of the ink jet recording apparatus 1 of the present invention, and the ink supply system, the sub tank, and the ink in the ink jet head have an ink temperature of 70 ° C. respectively. It is assumed that the first to third heating units are controlled.
  • FIG. 9 shows the measurement results of the temperature transition of the ink in the ink jet head in the ink jet recording apparatus 1 of the present invention and the ink jet recording apparatus of the prior art.
  • the horizontal axis represents time
  • the vertical axis represents ink temperature of the inkjet head.
  • the temperature transition of the ink in the inkjet head 241 in the inkjet recording apparatus 1 of the present invention is represented by a solid line A
  • the temperature transition of the ink in the inkjet head in the conventional inkjet recording apparatus is represented by a broken line B.
  • T1 and T2 indicate time periods in which image formation is performed by ejecting ink from the inkjet head.
  • the ink in the inkjet head rises above the ink discharge temperature of 70 ° C. during image formation. This is presumably because the temperature of the ink supplied to the ink jet head is 70 ° C., and the ink jet head itself generates heat when the piezo element of the ink jet head is driven, so that the temperature of the ink exceeds 70 ° C. In addition, the temperature of the ink in the ink-jet head has dropped to around 68 ° C after the end of image formation. This is because the temperature control of the ink-jet head immediately follows because the piezo element did not generate heat after the end of image formation. It is thought that it was not possible.
  • the conventional ink jet recording apparatus cannot stabilize the temperature of the ink in the ink jet head during image formation. If image formation is continued while the temperature of the ink in the ink jet head exceeds the ink discharge temperature, ink discharge failure or image deterioration occurs. Further, when image formation is stopped until the temperature of the ink in the inkjet head is lowered to the ink discharge temperature, the time required for image formation increases.
  • the temperature of the ink in the inkjet head 241 is kept constant even during image formation, and the temperature of the ink is It is not higher or lower than the discharge temperature. For this reason, it is possible to perform image formation continuously without causing ink ejection failure or image deterioration, and it is not necessary to stop image formation, so that the time required for image formation can be shortened.
  • the present invention is suitable for providing an ink jet recording apparatus and an ink temperature control method capable of stabilizing the temperature of ink in an ink jet head even during image formation.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)

Abstract

La présente invention concerne un dispositif d'enregistrement à jet d'encre 1 qui décharge de l'encre qui se liquéfie à une température supérieure ou égale à une température de liquéfaction et qui se gélifie à une température inférieure ou égale à une température de gélification qui est inférieure à la température de liquéfaction, et est pourvu d'une tête à jet d'encre 241, d'un système d'alimentation en encre 320, d'une première unité de chauffage 2421, 3011, d'une seconde unité de chauffage 2401, d'une unité de détection de température 2402, 2422, 3012, et d'une unité de commande 40. L'unité de commande 40 chauffe le système d'alimentation en encre 320 et la tête à jet d'encre 241 par l'intermédiaire de la première unité de chauffage 2421, 3011 et de la seconde unité de chauffage 2401, et, lorsque la température de l'encre dans le système d'alimentation en encre 320 est supérieure ou égale à la température de liquéfaction, commande la première unité de chauffage 2421, 3011 de telle sorte que la température de l'encre dans le système d'alimentation en encre 320 est supérieure à la température de gélification et inférieure à la température de liquéfaction.
PCT/JP2015/070216 2014-08-11 2015-07-15 Dispositif d'enregistrement à jet d'encre et procédé de commande de température d'encre WO2016024455A1 (fr)

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EP3459743A4 (fr) * 2016-05-18 2019-12-25 Hitachi, Ltd. Dispositif d'impression, procédé de commande de dispositif d'impression, et dispositif d'écriture
KR20230133762A (ko) 2022-03-11 2023-09-19 캐논 가부시끼가이샤 액체 토출장치, 액체 토출방법, 물품의 제조방법

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JP2009234221A (ja) * 2008-03-28 2009-10-15 Fujifilm Corp 画像形成装置
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