WO2016114204A1 - インクジェット記録装置及びインクジェット記録装置の制御方法 - Google Patents
インクジェット記録装置及びインクジェット記録装置の制御方法 Download PDFInfo
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- WO2016114204A1 WO2016114204A1 PCT/JP2016/050282 JP2016050282W WO2016114204A1 WO 2016114204 A1 WO2016114204 A1 WO 2016114204A1 JP 2016050282 W JP2016050282 W JP 2016050282W WO 2016114204 A1 WO2016114204 A1 WO 2016114204A1
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- WIPO (PCT)
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- unit
- recording
- ink
- transport
- heat source
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Classifications
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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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0024—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using conduction means, e.g. by using a heated platen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04528—Control methods or devices therefor, e.g. driver circuits, control circuits aiming at warming up the head
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04531—Control methods or devices therefor, e.g. driver circuits, control circuits controlling a head having a heater in the manifold
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04563—Control methods or devices therefor, e.g. driver circuits, control circuits detecting head temperature; Ink temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17593—Supplying ink in a solid state
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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
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
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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
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
- B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
-
- 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
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
-
- 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
- B41J2002/0055—Heating elements adjacent to nozzle orifices of printhead for warming up ink meniscuses, e.g. for lowering the surface tension of the ink meniscuses
-
- 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
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J2025/008—Actions or mechanisms not otherwise provided for comprising a plurality of print heads placed around a drum
-
- 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
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/21—Line printing
Definitions
- the present invention relates to an ink jet recording apparatus and a method for controlling the ink jet recording apparatus.
- an inkjet that records an image on a recording medium by ejecting ink from a plurality of nozzles provided in the recording head to a recording medium that is held and conveyed on a conveying surface of a conveying unit, and solidifying the ink Recording devices are known.
- a heat source that raises the temperature on the transport surface of the transport unit may be disposed near the transport surface.
- an ink heating unit that heats ink stored in the recording head is provided in the recording head, and the ink heating unit and the ink heating unit provide the ink heating unit.
- the heated recording head can correspond to a heat source near the conveyance surface.
- An object of the present invention is to provide an ink jet recording apparatus and an ink jet recording apparatus control method capable of suppressing the occurrence of temperature unevenness on the transport surface of the transport means when the transport operation of the transport means is stopped.
- the invention of the ink jet recording apparatus comprises: Conveying means for conveying the recording medium placed on the conveying surface of the conveying member by performing a conveying operation for moving the conveying member; Recording means for recording an image by ejecting ink onto a recording medium conveyed by the conveying means; A heat source, Heat source moving means for moving the heat source; Increasing the distance between the heat source and the transfer surface when the transfer operation being performed by the transfer means in a state where the heat source is located in the vicinity of the transfer surface is stopped in a mode where the transfer operation can be resumed.
- Heat source movement control means for moving the heat source by the heat source movement means It is characterized by having.
- the recording means has a configuration serving as the heat source,
- the heat source moving means moves the heat source by moving the recording means.
- the invention according to claim 3 is the ink jet recording apparatus according to claim 2, An ink heating means for heating the ink stored and discharged in the recording means; Heating control means for heating the ink to a temperature higher than the temperature of the conveying surface of the conveying member by the ink heating means; With The recording unit has a structure that transmits heat of the ink heating unit to a configuration serving as the heat source.
- the heating control means is characterized in that the ink heating means heats the ink to a temperature higher by 10 ° C. than the temperature of the conveying surface of the conveying member.
- the invention according to claim 5 is the ink jet recording apparatus according to claim 3 or 4,
- the ink stored in the recording means is gel-like at room temperature and has a property of being sol-like when heated,
- the heating control means causes the ink to be heated to a sol temperature by the ink heating means,
- the recording means discharges the sol-shaped ink heated by the ink heating means to the recording medium.
- the invention according to claim 6 is the ink jet recording apparatus according to any one of claims 1 to 5,
- the recording means includes a plurality of recording elements arranged in a direction crossing the conveyance direction over a recording width in the width direction on the recording medium in a width direction orthogonal to the conveyance direction of the recording medium by the conveyance means. It is characterized by ejecting ink.
- the invention according to claim 7 is the ink jet recording apparatus according to any one of claims 1 to 6,
- the transport member has a cylindrical surface of the transport surface,
- the transport means performs the transport operation by rotating the transport surface.
- the invention according to claim 8 is the inkjet recording apparatus according to any one of claims 1 to 7, It has a conveying member heating means for heating the conveying surface of the conveying member.
- the invention according to claim 9 is the inkjet recording apparatus according to any one of claims 1 to 8, It is characterized by comprising transport control means for stopping the transport operation of the transport means when a predetermined abnormality occurs.
- an invention of an ink jet recording apparatus control method comprises: By carrying out a carrying operation that moves the carrying member, a carrying unit that carries the recording medium placed on the carrying surface of the carrying member, and an image by ejecting ink to the recording medium carried by the carrying unit
- a method for controlling an ink jet recording apparatus comprising: a recording unit that records a heat source; and a heat source moving unit that moves the heat source. Increasing the distance between the heat source and the transfer surface when the transfer operation being performed by the transfer means in a state where the heat source is located in the vicinity of the transfer surface is stopped in a mode where the transfer operation can be resumed.
- the method includes a heat source moving step of moving the heat source by the heat source moving means.
- FIG. 1 is a diagram illustrating a schematic configuration of an ink jet recording apparatus according to an embodiment of the present invention. It is the schematic of an internal structure at the time of seeing a head unit from the side. It is the schematic of an internal structure at the time of seeing a head unit from the conveyance part side.
- FIG. 4 is a diagram illustrating a state where the head unit is moved by the head unit moving mechanism and the recording head is in an operating position.
- FIG. 6 is a diagram illustrating a state in which the head unit is moved by the head unit moving mechanism and the recording head is in the retracted position. It is a block diagram which shows the main function structures of an inkjet recording device. It is a flowchart which shows the control procedure of an image recording process. It is a flowchart which shows the control procedure of an emergency stop process.
- FIG. 1 is a diagram showing a schematic configuration of an ink jet recording apparatus 1 according to an embodiment of the present invention.
- the ink jet recording apparatus 1 includes a paper feeding unit 10, an image recording unit 20, a paper discharge unit 30, and a control unit 40 (FIG. 4). 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 recording unit 20, and records (forms) an image on the recording medium P by the image recording unit 20. Then, the recording medium P on which the image is recorded is conveyed to the paper discharge unit 30.
- As the recording medium P various media capable of fixing the ink (coloring material) discharged to the surface, such as paper, cloth, or sheet-like resin, can be used.
- 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 recording unit 20.
- the transport unit 12 includes a ring-shaped belt 123 whose inner side is supported by two rollers 121 and 122. The transport unit 12 transports the recording medium P by rotating the rollers 121 and 122 while the recording medium P is placed on the belt 123.
- the image recording unit 20 includes a conveying unit 21 (conveying unit), a delivery unit 22, a conveying drum heating unit 23 (conveying member heating unit), a head unit 50, a fixing unit 24, and a delivery unit 25.
- the transport unit 21 includes a base 213 and a transport drum 211 (transport member) attached to the base 213.
- the transport drum 211 places and holds the recording medium P on a cylindrical transport surface 212 that is an outer peripheral surface of the transport drum 211.
- the transport unit 21 rotates (moves) the transport drum 211 holding the recording medium P around the rotation axis of the transport surface 212 extending in a direction perpendicular to the drawing of FIG. In the following, the recording medium P is transported in the transport direction along the transport surface 212 (hereinafter referred to as the Y direction).
- the transport drum 211 includes a claw portion and a suction portion (not shown) for holding the recording medium P on the transport surface 212.
- the recording medium P is held on the conveyance surface 212 of the conveyance drum 211 by the end being pressed by the claw portion and sucked to the conveyance surface 212 by the intake portion.
- the transport unit 21 includes a transport drum motor 214 (FIG. 4) for rotating the transport drum 211, and the transport drum 211 rotates by an angle proportional to the rotation amount of the transport drum motor 214.
- the delivery unit 22 delivers the recording medium P transported by the transport unit 12 of the paper feed unit 10 to the transport unit 21.
- the delivery unit 22 is provided at a position between the transport unit 12 and the transport unit 21 of the paper feeding unit 10, picks up one end of the recording medium P transported from the transport unit 12 by the swing arm unit 221, and delivers it. Delivered to the transport unit 21 via the drum 222.
- the conveyance drum heating unit 23 heats the conveyance surface 212 of the conveyance drum 211 rotating in the conveyance unit 21 and the recording medium P held on the conveyance drum 211 to a predetermined set temperature.
- the conveyance drum heating unit 23 includes, for example, an infrared heater, and the infrared heater generates heat in response to energization.
- the conveyance drum heating unit 23 is provided at a position facing the conveyance surface 212 of the conveyance drum 211 and upstream of the head unit 50 in the conveyance direction of the recording medium P. Further, a temperature sensor (not shown) is provided in the vicinity of the conveyance drum heating unit 23.
- the control unit 40 controls the heat generation of the transport drum heating unit 23 so that the transport surface 212 of the transport drum 211 reaches a predetermined temperature based on the temperature near the transport drum heating unit 23 detected by the temperature sensor. As a result, the recording medium P held and conveyed by the conveyance drum 211 is also heated to the predetermined temperature.
- the conveyance drum heating unit 23 heats the conveyance drum 211 to a temperature in the range of 40 ° C. or more and 60 ° C. or less, for example. This temperature range is a range in which an image with good image quality can be recorded on the recording medium P when the ink heating temperature described later is in the range of 70 ° C. or higher and 90 ° C. or lower.
- the entire conveyance drum 211 is heated to the above temperature by the conveyance drum heating unit 23.
- a part of the conveyance drum 211 including the conveyance surface 212 is heated to the temperature. It may be an embodiment.
- the heating temperature by the conveyance drum heating unit 23 may be changed as appropriate when the heating temperature of the ink is changed according to the type of ink. Further, when the recording medium P capable of recording an image with good image quality even at a low temperature is used, the lower limit value of the heating temperature by the conveying drum heating unit 23 may be a temperature lower than 40 ° C.
- the head unit 50 records an image by ejecting ink onto the recording medium P held by the transport unit 21.
- the head unit 50 is disposed with a predetermined distance between the ink ejection surface and the conveyance surface 212 of the conveyance unit 21.
- the inkjet recording apparatus 1 includes four head units 50Y, 50M, 50C, and 50K (corresponding to four colors of yellow (Y), magenta (M), cyan (C), and black (K), respectively.
- these four head units 50 are also arranged at predetermined intervals in the order of colors Y, M, C, and K from the upstream side along the conveyance direction of the recording medium P. Yes.
- FIG. 2A and 2B are diagrams showing the internal configuration of the head unit 50.
- FIG. 2A is a schematic diagram of the internal configuration when the head unit 50 is viewed from the side
- FIG. 2B is a schematic diagram of the internal configuration when the head unit 50 is viewed from the conveyance unit 21 side.
- the case where the head unit 50 is viewed from the side means a case where the head unit 50 is viewed from a direction parallel to the transport direction of the recording medium P at a position facing the head unit 50 on the transport surface 212.
- one head unit 50 is provided with 16 recording heads (recording means, heat source) 52.
- the 16 recording heads 52 constitute two recording heads 52 as a set, and constitute eight recording head modules 51.
- Each of the recording heads 52 has a plurality of recording elements 53.
- Each recording element 53 includes a pressure chamber for storing ink, a piezoelectric element provided on the wall surface of the pressure chamber, and a nozzle. When a drive voltage is applied from the drive circuit of the recording head 52 to the piezoelectric element, the pressure in the pressure chamber changes according to the magnitude of the drive voltage, and ink is ejected from the nozzles communicating with the pressure chamber.
- the nozzles of the recording element 53 are provided with openings on the surface (ink ejection surface) of the head unit 50 on the transport unit 21 side.
- a part of the opening of the nozzle included in the recording element 53 is drawn as a point.
- the nozzles of the plurality of recording elements 53 provided in the recording head 52 are arranged in the width direction (X direction) orthogonal to the conveyance direction (Y direction) of the recording medium P on the surface facing the conveyance unit 21 of the recording head 52. Yes.
- the recording elements 53 are arranged at equal intervals in the X direction. Note that the nozzle rows of the recording elements 53 need only be arranged in a direction crossing the transport direction, and need not necessarily be arranged in a direction orthogonal to the transport direction.
- Each recording head 52 includes two rows of recording elements 53 arranged in the X direction. Accordingly, each recording head module 51 includes four columns of the recording elements 53. In each recording head module 51, each of the four rows of recording elements 53 is arranged at different positions in the X direction as a whole.
- the arrangement of the recording elements 53 means an arrangement of nozzle positions in the recording elements 53.
- the eight recording head modules 51 included in each head unit 50 are arranged in a staggered pattern so that the arrangement ranges in the X direction partially overlap each other, and the first, third, fifth, and seventh positions along the X direction.
- the columns of the recording elements 53 of the recording head modules 51 are positioned on the same line, and the columns of the recording elements 53 of the second, fourth, sixth, and eighth recording head modules 51 are positioned on the same line.
- the arrangement range in the X direction of the recording element 53 included in the head unit 50 covers the width (recording width) in the X direction of the area where the image is recorded in the recording medium P held and conveyed by the conveyance unit 21.
- the head unit 50 is used with its position fixed with respect to the transport unit 21 when recording an image. That is, the inkjet recording apparatus 1 is a single-pass inkjet recording apparatus.
- each recording head 52 is provided with an ink heating section 54 (ink heating means).
- the ink heating unit 54 includes, for example, a heating wire and the temperature rises as the heating wire generates heat in response to energization. Between the recording head 52 and the ink stored in the recording head 52, heat transfer occurs according to the temperature difference between the recording head 52 and the ink. Therefore, when the recording head 52 is heated by the ink heating unit 54, the ink in the recording head 52 is heated, and the temperature of the recording head 52 and the ink becomes the same in a steady state.
- the recording head 52 includes a plurality of (for example, six) temperature sensors (not shown) in the vicinity of a portion of the recording head 52 where ink is stored.
- the control unit 40 Based on the average value of the temperatures detected by the plurality of temperature sensors of the recording head 52, the control unit 40 generates heat from the ink heating unit 54 so that the ink stored in the recording head 52 has a predetermined temperature. Control.
- the ink heating unit 54 heats the ink stored in the recording head 52 to a temperature in the range of 70 ° C. or higher and 90 ° C. or lower, for example.
- the ink heating temperature may be changed according to the type of ink.
- 2A shows an example in which the ink heating unit 54 is attached to the outside of the exterior member of the recording head 52. However, the ink heating unit 54 is disposed inside the exterior member of the recording head 52. May be.
- the recording head 52 of the present embodiment has a structure in which the heat of the ink heating unit 54 is transmitted to the entire recording head 52, and the entire recording head 52 corresponds to a heat source.
- the ink ejected from the nozzles of the recording element 53 is an ink that has a characteristic of being a gel at normal temperature and becoming a sol when heated.
- the head unit 50 includes an ink storage unit (not shown) in which the ink supplied to the recording head 52 is stored, and a heating unit (not shown) that heats the ink in the ink storage unit to form a sol. Is supplied to the recording head 52.
- the recording head 52 heats and discharges the sol-like ink supplied from the ink storage unit to a predetermined temperature by the ink heating unit 54.
- the ink used in the present embodiment has a characteristic of being cured by irradiation with energy rays such as ultraviolet rays.
- each head unit 50 is used while being fixed in position with respect to the conveyance unit 21 when recording an image. However, when the image is not recorded, the relative position with respect to the conveyance unit 21 is changed. Is possible.
- FIGS. 3A and 3B are diagrams illustrating a head unit moving mechanism 55 (heat source moving means) that moves the head unit 50.
- the head unit moving mechanism 55 includes a pair of support portions 56a and 56b arranged on the ⁇ X direction side and the + X direction side of the head unit 50, and attachment members 57a and 57b attached to the support portions 56a and 56b, respectively. Is provided.
- the attachment members 57a and 57b are fixed to the ⁇ X direction side and + X direction side ends of the head unit 50, respectively.
- the mounting members 57a and 57b are transported by a power conversion mechanism that converts the rotation of a stepping motor (not shown) provided inside or outside the support portions 56a and 56b into a displacement in a direction perpendicular to the transport surface 212 of the transport drum 211. It is configured to move in a direction perpendicular to the surface 212.
- the head unit moving mechanism 55 configured as described above is configured so that the head unit 50 fixed to the mounting members 57a and 57b and the recording head 52 included in the head unit 50 are transported by a distance proportional to the rotation amount of the stepping motor.
- the distance between the ink discharge surface of the recording head 52 and the transport surface 212 of the transport drum 211 is changed by moving the head in a direction perpendicular to the head 212.
- the head unit moving mechanism 55 can switch the moving direction of the head unit 50 according to the rotation direction of the stepping motor.
- another motor such as a servo motor may be used instead of the above stepping motor.
- the head unit moving mechanism 55 may be configured to move the head unit 50 so that the distance between the recording head 52 and the transport surface 212 changes. It does not have to be perpendicular to the direction.
- the head unit moving mechanism 55 moves the recording head 52 included in the head unit 50 from the operating position (temperature rising position) shown in FIG. 3A and the retracted position shown in FIG. 3B. Move between.
- the operation position is a position where the relative positional relationship with the base 213 of the transport unit 21 is constant, and the recording head when the image is recorded on the recording medium P by the ejection of ink from the recording head 52. 52 position.
- the distance between the recording head 52 and the transport surface 212 of the transport unit 21 is, for example, 1 mm.
- the recording head 52 arranged at the operating position and heated by the ink heating unit 54 increases the temperature of the transport drum 211 by transferring heat to the transport drum 211 of the transport unit 21.
- the position range of the heat source in which the temperature on the transport surface 212 of the transport drum 211 rises when heat is transmitted from the heat source is also referred to as the vicinity of the transport surface 212.
- the retreat position is to retract the recording head 52 in order to prevent a local temperature rise of the transport unit 21 due to heat transmitted from the recording head 52 when the recording head 52 is not recording an image. It is the position of the tip.
- the distance between the recording head 52 and the transport surface of the transport unit 21 is, for example, 10 cm. The retraction of the recording head 52 will be described in detail later.
- the head unit moving mechanism 55 and the support portions 56a and 56b are A carriage (not shown) that is fixed as a whole can be moved in the + X direction along a guide rail (not shown) that extends in the X direction. Accordingly, the head unit 50 can be moved to a position where the recording head 52 included in the head unit 50 faces a cleaning unit (not shown).
- the ink discharge surface of the recording head 52 is wiped by a wiping cloth provided in the cleaning unit soaked with a predetermined chemical solution, and ink and other foreign matters adhering to the ink discharge surface are removed. Removed.
- the fixing unit 24 includes a light emitting unit arranged in the X direction over the width of the transport unit 21 in the X direction.
- the fixing unit 24 applies ultraviolet rays from the light emitting unit to the recording medium P held on the transport surface 212 of the transport unit 21.
- the ink discharged onto the recording medium P is cured and fixed by irradiating energy rays such as the same.
- the fixing unit 24 is disposed on the downstream side of the head unit 50 in the transport direction so as to face the transport surface 212.
- the light emitting portion of the fixing unit 24 includes, for example, a fluorescent tube (low pressure mercury lamp, germicidal lamp), a cold cathode tube, an ultraviolet laser, and a low pressure having an operating pressure of several hundred Pa to 1 MPa.
- a fluorescent tube low pressure mercury lamp, germicidal lamp
- a cold cathode tube cold cathode tube
- an ultraviolet laser and a low pressure having an operating pressure of several hundred Pa to 1 MPa.
- Medium pressure, high pressure mercury lamp, metal halide lamp, LED (Light Emitting Diode), etc. are used.
- the delivery unit 25 includes an annular belt 253 that is supported by two rollers 251 and 252 inside, and a cylindrical delivery drum 254 that delivers the recording medium P from the transport unit 21 to the belt 253.
- the recording medium P transferred from the conveyance unit 21 to the belt 253 by the H.254 is conveyed by the belt 253 and sent to the paper discharge unit 30.
- the paper discharge unit 30 includes a plate-shaped paper discharge tray 31 on which the recording medium P sent out from the image recording unit 20 by the delivery unit 25 is placed.
- FIG. 4 is a block diagram showing the main functional configuration of the inkjet recording apparatus 1.
- the inkjet recording apparatus 1 includes a control unit 40 including a CPU 41 (Central Processing Unit) (heat source movement control unit, heating control unit, conveyance control unit), a RAM 42 (Random Access Memory), a ROM 43 (Read Only Memory), and a storage unit 44.
- a transport drum motor control circuit 61 connected to the transport drum motor 214, a head unit moving mechanism control circuit 62 connected to the head unit moving mechanism 55, a recording head control circuit 63 connected to the recording head 52, and an external An interface 64 connected to the apparatus 2 and an operation display unit 65 connected to the interface 64 are provided.
- the CPU 41 is connected to the RAM 42, the ROM 43, the transport drum motor control circuit 61, the head unit moving mechanism control circuit 62, the recording head control circuit 63, and the interface 64 via the bus 66.
- the CPU 41 performs various arithmetic processes and controls the overall operation of the inkjet recording apparatus 1. For example, the CPU 41 outputs a control signal from the transport drum motor control circuit 61 to the drive circuit of the transport drum motor 214 and operates the transport drum motor 214 to rotate the transport drum 211 of the transport unit 21. Further, the CPU 41 outputs the control signal from the head unit moving mechanism control circuit 62 to the drive circuit of the head unit moving mechanism 55 and operates the head unit moving mechanism 55 to move the head unit 50. Further, the CPU 41 outputs image data of an image recorded on the recording medium P from the recording head control circuit 63 to the recording head 52, thereby ejecting ink from the recording head 52 and recording an image on the recording medium P. Further, the CPU 41 outputs a control signal to the drive circuit of the ink heating unit 54 to cause the ink heating unit 54 to heat the ink stored in the recording head 52.
- the RAM 42 provides a working memory space to the CPU 41 and stores temporary data.
- the ROM 43 stores various control programs executed by the CPU 41, setting data, and the like.
- the program includes an image recording program for recording an image on the recording medium P by operating the transport unit 21, the recording head 52, and the like, and an emergency stop program for emergency stopping the inkjet recording apparatus 1.
- a rewritable nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read Only Memory) or a flash memory may be used.
- the storage unit 44 is composed of DRAM (Dynamic Random Access Memory) or the like.
- the storage unit 44 stores a print job that is input from the external apparatus 2 via the interface 64 and includes image data of an image to be recorded on the recording medium P, and the type and number of recording media P to be recorded.
- the conveyance drum motor control circuit 61 outputs a control signal for operating the conveyance drum motor 214 to the conveyance drum motor 214 based on the signal input from the CPU 41.
- the head unit moving mechanism control circuit 62 outputs a control signal for operating the head unit moving mechanism 55 to the head unit moving mechanism 55 based on the signal input from the CPU 41.
- the recording head control circuit 63 is based on the signal input from the CPU 41 and the image data stored in the storage unit 44, and the timing of the driving voltage applied from the driving circuit of the recording head 52 to the piezoelectric element of the recording element and / or A control signal (image data) for determining the size is output to the recording head 52.
- the interface 64 is a means for transmitting and receiving data between the external device 2 and the operation display unit 65, and includes any one of various serial interfaces, various parallel interfaces, or a combination thereof.
- the operation display unit 65 includes a display device such as a liquid crystal display device and an input device such as a light-transmissive touch panel attached on the display device.
- the operation display unit 65 receives an input operation from the user and outputs a signal corresponding to the input operation. For example, in the operation display unit 65, an input operation related to an emergency stop instruction from the user is performed.
- the operation display unit 65 displays the execution result of the program by the CPU 41.
- the external device 2 is a personal computer, for example, and supplies image data of an image recorded by the inkjet recording device 1 to the control unit 40 via the interface 64.
- the recording head 52 and the ink stored in the recording head 52 are heated to a temperature in the range of 70 ° C. to 90 ° C. during image recording, and the transport drum 211 of the transport unit 21. Is heated to a temperature in the range of 40 ° C to 60 ° C. Accordingly, the temperature of the recording head 52 during image recording is 10 ° C. or more higher than the temperature of the conveying surface 212 of the conveying drum 211. Further, at the time of image recording, the recording head 52 is disposed at the operating position shown in FIG. 3A.
- the temperature of the transport drum 211 is also detected on the recording medium P. Temperature unevenness occurs in the distribution reflecting the unevenness.
- image recording is performed by ejecting ink onto the recording medium P, the image quality of the recorded image is improved due to variations in the solidification mode of the ink ejected onto the recording medium P due to temperature unevenness of the recording medium P. descend.
- the recording unit 52 when the transport operation of the transport unit 21 is stopped in such a manner that the transport operation can be resumed, the recording unit 52 is moved from the operating position to the retracted position by the head unit moving mechanism 55. . That is, the recording head 52 is moved by the head unit moving mechanism 55 so as to increase the distance between the recording head 52 and the conveyance surface 212. This makes it difficult for heat to be transferred from the recording head 52 to the transport drum 211.
- the retracted distance and the operation may be set larger as the temperature difference between the recording head 52 and the transport drum 211 is larger. Further, the difference between the retreat distance and the operation distance may be changed based on the scheduled stop time of rotation of the transport unit 21, the size and heat conductivity of the transport unit 21, the type of ink, and the like.
- the user stops the image recording operation or the conveyance operation of the conveyance unit 21 by the user in addition to the normal image recording operation being completed.
- an instructing input operation is performed, or when an interrupt mechanism related to an emergency stop process is executed by the CPU 41 when a predetermined condition is satisfied and the interlock mechanism is activated.
- examples of the predetermined condition for operating the interlock mechanism include occurrence of an operation error in a predetermined component that may cause a problem in image recording by the inkjet recording apparatus 1, input of an emergency stop instruction from the outside, The occurrence of an earthquake, the opening of the door of the hangar when the inkjet recording apparatus 1 is housed in the hangar for ensuring safety, and the like can be mentioned.
- the operation when the transport operation of the transport unit 21 is stopped will be described taking the normal image recording process and the emergency stop process as examples.
- FIG. 5 is a flowchart showing the control procedure of the image recording process.
- This image recording process is executed when a print job including image data is input from the external apparatus 2 to the control unit 40 via the interface 64, for example.
- the ink in the recording head 52 is heated to a predetermined set temperature corresponding to the type of ink by the ink heating unit 54.
- the transport drum 211 of the transport unit 21 is heated to a predetermined set temperature by the transport drum heating unit 23.
- the ink in the recording head 52 is heated to a temperature included in the range of 70 ° C. or higher and 90 ° C. or lower
- the transport drum 211 is heated to a temperature included in the range of 40 ° C. or higher and 60 ° C. or lower. .
- the CPU 41 outputs a control signal from the head unit moving mechanism control circuit 62 to the head unit moving mechanism 55, and moves the head unit 50 by the head unit moving mechanism 55 so that the recording head 52 is disposed at the operating position (step). S11).
- the CPU 41 outputs a control signal from the transport drum motor control circuit 61 to the transport drum motor 214 to operate the transport drum motor 214, thereby rotating the transport drum 211 and causing the transport unit 21 to perform a transport operation (step S12). .
- the CPU 41 operates each part of the paper feed unit 10 and the image recording unit 20 based on the print job stored in the storage unit 44 to record an image on the recording medium P conveyed by the conveyance unit 21 (step S13). Specifically, the CPU 41 outputs a control signal to the transport unit 12 and the delivery unit 22, transports the recording medium P from the paper feed unit 10 onto the transport unit 21, holds the transport medium 21, and transports the recording medium P by the transport unit 21. . Then, the CPU 41 outputs the image data stored in the storage unit 44 from the recording head control circuit 63 to the recording head 52, thereby ejecting ink from the recording head 52 onto the recording medium P conveyed by the conveying unit 21. Thus, an image is recorded on the recording medium P.
- the CPU 41 transports the recording medium P on which an image is recorded to the position of the fixing unit 24, and fixes the ink on the recording medium P by the fixing unit 24. Further, the CPU 41 causes the delivery unit 25 to transport the recording medium P on which the ink has been fixed to the paper discharge unit 30.
- the CPU 41 determines whether or not a print job that has not been executed is stored in the storage unit 44 (step S14). If it is determined that a print job that has not been executed is stored in the storage unit 44 (“YES” in step S14), the CPU 41 shifts the processing to step S13 and performs an image relating to an unexecuted print job. Make a record.
- step S14 If it is determined that an unexecuted print job is not stored in the storage unit 44 (“NO” in step S14), the CPU 41 causes the transport drum motor control circuit 61 to output a control signal to the transport drum motor 214. Then, the operation of the transport drum motor 214 is stopped to stop the rotation of the transport drum 211, and the transport operation of the transport unit 21 is stopped (step S15).
- the CPU 41 outputs a control signal from the head unit moving mechanism control circuit 62 to the head unit moving mechanism 55 and moves the head unit 50 by the head unit moving mechanism 55 so that the recording head 52 moves from the operating position to the retracted position. (Step S16; heat source moving step).
- step S17 the CPU 41 shifts each part of the inkjet recording apparatus 1 to a predetermined state set as a state at the start of the image recording process.
- step S17 the CPU 41 ends the image recording process.
- FIG. 6 is a flowchart showing the control procedure of the emergency stop process.
- This emergency stop process is executed when a predetermined abnormality occurs in the inkjet recording apparatus 1 that is performing the image recording process.
- the user performs an input operation for instructing the external device 2 or the operation display unit 65 to stop the image recording operation or stop the transport operation of the transport unit 21 via the interface 64.
- This is interrupt processing executed when an interrupt request signal related to an emergency stop instruction is transmitted to the CPU 41 or when the above-described interlock mechanism is activated and the interrupt request signal is transmitted to the CPU 41.
- the CPU 41 determines whether or not the transport drum 211 is rotating, that is, whether or not the transport unit 21 is performing a transport operation (step S21).
- the CPU 41 causes the transport drum motor 214 to output a control signal from the transport drum motor control circuit 61 to thereby transport the transport drum motor.
- the rotation of the transport drum 211 is stopped by stopping the operation of 214, and the transport operation of the transport unit 21 is stopped (step S22).
- the CPU 41 determines whether an image is recorded by the recording head 52 (step S23).
- step S23 When it is determined that an image is being recorded by the recording head 52 (“YES” in step S23), the CPU 41 causes the recording head control circuit 63 to output a control signal to the recording head 52, thereby recording.
- the head control circuit 63 stops the ink ejection by the recording head 52 and stops the image recording by the recording head 52 (step S24). Note that step S23 and step S24 are executed in parallel with step S22 after the CPU 41 performs processing for stopping the transport operation of the transport unit 21 in step S22 and before the rotation of the transport drum 211 completely stops. May be.
- step S24 the CPU 41 outputs a control signal from the head unit moving mechanism control circuit 62 to the head unit moving mechanism 55 so that the recording head 52 moves from the operating position to the retracted position.
- the head unit 50 is moved by 55 (step S25; heat source moving step).
- step S23 If it is determined in step S23 that an image is not recorded by the recording head 52 (“NO” in step S23), the CPU 41 shifts the process to step S25.
- step S26 the CPU 41 executes a stop process of the inkjet recording apparatus 1 (step S26).
- the CPU 41 shifts each part of the inkjet recording apparatus 1 to a predetermined state set as a state at the start of the image recording process.
- step S21 When it is determined in step S21 that the transport unit 21 is not performing a transport operation (“NO” in step S21), the CPU 41 determines whether or not the recording head 52 is in the retracted position (step S27). .
- step S27 If it is determined that the recording head 52 is not in the retracted position (“NO” in step S27), the CPU 41 shifts the process to step S25. If it is determined that the recording head 52 is in the retracted position (“YES” in step S27), the CPU 41 shifts the process to step S26. When the process of step S26 ends, the CPU 41 ends the emergency stop process.
- the ink jet recording apparatus 1 performs the transport operation of rotating the transport drum 211 to transport the recording medium P placed on the transport surface 212 of the transport drum 211.
- a recording head 52 that records an image by ejecting ink onto the recording medium P conveyed by the conveying unit 21, a recording head 52 as a heat source, a head unit moving mechanism 55 that moves the recording head 52,
- the distance between the recording head 52 and the conveyance surface 212 is increased when the conveyance operation performed by the conveyance unit 21 in a state where the recording head 52 is positioned in the vicinity of the conveyance surface 212 is stopped in such a manner that the conveyance operation can be resumed.
- a CPU 41 as heat source movement control means for moving the recording head 52 by the head unit moving mechanism 55 thereby, the temperature rise in the conveyance surface 212 of the conveyance drum 211 due to the heat of the recording head 52 when the conveyance operation of the conveyance unit 21 is stopped is suppressed. Therefore, occurrence of temperature unevenness on the conveyance surface 212 of the conveyance drum 211 can be suppressed. As a result, occurrence of temperature unevenness in the recording medium P held by the transport drum 211 when the transport operation by the transport unit 21 is performed and image recording is resumed is suppressed, so that recording due to temperature unevenness of the recording medium P is performed. A reduction in image quality can be suppressed.
- the recording head 52 has a configuration as a heat source, and the head unit moving mechanism 55 moves the heat source by moving the recording head 52.
- the recording head 52 is at a higher temperature than the conveyance drum 211, it is possible to suppress the occurrence of temperature unevenness on the conveyance surface 212 of the conveyance drum 211 when the conveyance operation of the conveyance unit 21 is stopped.
- the ink jet recording apparatus 1 includes an ink heating unit 54 that heats the ink stored and ejected in the recording head 52, and the CPU 41 as a heating control unit causes the ink heating unit 54 to feed ink to the transport surface of the transport drum 211.
- the print head 52 is heated to a temperature higher than the temperature 212, and the print head 52 is configured to transmit the heat of the ink heating unit 54 to the heat source of the print head 52.
- the ink stored in the recording head 52 is heated, and in the aspect in which the heated ink is ejected from the recording head 52, the conveyance surface 212 of the conveyance drum 211 when the conveyance operation of the conveyance unit 21 stops is performed.
- the occurrence of temperature unevenness due to the heated recording head 52 can be suppressed.
- the CPU 41 as the heating control means causes the ink heating unit 54 to heat the ink to a temperature that is 10 ° C. or more higher than the temperature of the transport surface 212 of the transport drum 211.
- the temperature rise of the transport drum 211 due to the transfer of heat from the recording head 52 disposed at the operation position to the transport drum 211 becomes significant, but when the transport operation of the transport unit 21 stops, By moving the recording head 52 so as to increase the distance to the surface 212, it is possible to suppress the occurrence of temperature unevenness on the transport surface 212 of the transport drum 211.
- the ink stored in the recording head 52 has a characteristic that it is gel-like at normal temperature and becomes sol-like when heated, and the CPU 41 as a heating control means uses the ink heating unit 54 to remove the ink.
- the recording head 52 discharges the sol-shaped ink heated by the ink heating unit 54 to the recording medium P by heating the ink to a temperature at which the ink becomes sol-shaped. Thereby, an image can be recorded on the recording medium P in such a manner that the sol-like ink discharged onto the recording medium P is cooled to become a gel and the ink is quickly solidified.
- the plurality of recording heads 52 included in the head unit 50 intersects the transport direction in the width direction perpendicular to the transport direction of the recording medium P by the transport unit 21 over the width of the recording medium P in the width direction.
- Ink is ejected from a plurality of recording elements 53 arranged in the direction.
- the transport drum 211 has a cylindrical transport surface 212, and the transport unit 21 performs a transport operation by rotating the transport surface 212. Thereby, when the conveyance operation of the conveyance unit 21 is performed, the temperature rise of the conveyance drum 211 due to the heat of the recording head 52 at the operation position can be made uniform in each part of the conveyance drum 211.
- the inkjet recording apparatus 1 includes a conveyance drum heating unit 23 that heats the conveyance surface 212 of the conveyance drum 211. Thereby, even when the recording head 52 is heated to a high temperature, the temperature difference between the recording head 52 and the transport drum 211 can be within a predetermined range.
- the CPU 41 as the transport control means stops the transport operation of the transport unit 21 when a predetermined abnormality occurs. Thereby, when an abnormality occurs in the inkjet recording apparatus 1, the conveyance operation of the conveyance unit 21 can be stopped to ensure safety, and the conveyance surface of the conveyance drum 211 when the conveyance operation of the conveyance unit 21 is stopped. The occurrence of temperature unevenness at 212 can be suppressed.
- the present invention is not limited to the above-described embodiments and modifications, and various modifications can be made.
- the present invention is not limited to this.
- the structure may be transmitted to a part of the configuration, and the part of the configuration may correspond to the heat source.
- the present invention is not limited to this, and the temperature rises due to heat generation when the conveying drum heating unit 23 or the energy beam is irradiated.
- the conveyance unit 21 that rotates the conveyance drum 211 around the base 213 as the conveyance unit has been described as an example.
- the present invention is not limited to this, and the recording medium is held on the conveyance surface of the conveyance member and conveyed.
- Any conveying means that conveys the recording medium P by moving the member relative to the base can be used.
- it has a belt as a conveying member that is supported by two rollers as a base and moves around the two rollers around the rollers according to the rotation of the rollers, and on the conveying surface of the belt
- a conveying unit that holds the recording medium P may be used.
- the ink jet recording apparatus 1 that discharges the ink that is gelled at room temperature and is heated to form a sol when heated is described as an example.
- the present invention is not limited to this.
- Various known inks including inks that are sol or liquid at room temperature may be used.
- a mode in which ink that is sol at normal temperature is used and the ink is heated to lower the viscosity and then ejected.
- the head unit 50 is provided with eight recording head modules 51 and sixteen recording heads 52 as recording means, and each recording head 52 is provided with two rows of recording elements 53.
- the number of columns of the recording elements 53 included in each recording head 52 may be one column or three or more columns.
- the number of recording heads 52 included in each recording head module 51 may be 1 or 3 or more.
- the head unit 50 may be configured by a single recording head module 51 or recording head 52.
- the recording element 53 of one or a plurality of recording heads 52 included in the head unit 50 is arranged over the recording width in the X direction on the recording medium P, so that the single-pass inkjet recording apparatus 1 is used. Can be configured.
- one or a plurality of recording heads 52 included in the head unit 50 correspond to a recording unit.
- the single-pass inkjet recording apparatus 1 has been described as an example.
- an inkjet that records an image while scanning the recording head in the main scanning direction (a direction orthogonal to the conveyance direction of the recording medium P).
- the present invention may be applied to a recording apparatus.
- the present invention can be used in an ink jet recording apparatus and an ink jet recording apparatus control method.
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- Ink Jet (AREA)
Abstract
Description
搬送部材を移動させる搬送動作を行うことで当該搬送部材の搬送面上に載置された記録媒体を搬送する搬送手段と、
前記搬送手段により搬送される記録媒体に対してインクを吐出して画像を記録する記録手段と、
熱源と、
前記熱源を移動させる熱源移動手段と、
前記熱源が前記搬送面の近傍に位置した状態で前記搬送手段により行われている前記搬送動作が当該搬送動作を再開できる態様で停止した場合に、前記熱源と前記搬送面との距離を増大させるように前記熱源移動手段により前記熱源を移動させる熱源移動制御手段と、
を備えることを特徴としている。
前記記録手段は、前記熱源となる構成を有し、
前記熱源移動手段は、前記記録手段を移動させることで前記熱源を移動させる
ことを特徴としている。
前記記録手段に貯留されて吐出されるインクを加熱するインク加熱手段と、
前記インク加熱手段により前記インクを前記搬送部材の搬送面の温度より高い温度に加熱させる加熱制御手段と、
を備え、
前記記録手段は、前記インク加熱手段の熱を前記熱源となる構成に伝える構造である
ことを特徴としている。
前記加熱制御手段は、前記インク加熱手段により前記インクを前記搬送部材の搬送面の温度より10℃以上高い温度に加熱させることを特徴としている。
前記記録手段に貯留されるインクは、常温でゲル状でありかつ加熱されることでゾル状となる特性を有し、
前記加熱制御手段は、前記インク加熱手段により前記インクをゾル状となる温度に加熱させ、
前記記録手段は、前記インク加熱手段により加熱されたゾル状の前記インクを前記記録媒体に吐出する
ことを特徴としている。
前記記録手段は、前記搬送手段による記録媒体の搬送方向と直交する幅方向に前記記録媒体への当該幅方向の記録幅に亘って当該搬送方向と交差する向きに配列された複数の記録素子からインクを吐出することを特徴としている。
前記搬送部材は、円柱面状の前記搬送面を有し、
前記搬送手段は、前記搬送面を回転させることで前記搬送動作を行う
ことを特徴としている。
前記搬送部材の搬送面を加熱する搬送部材加熱手段を備えることを特徴としている。
所定の異常が生じた場合に前記搬送手段の前記搬送動作を停止させる搬送制御手段を備えることを特徴としている。
搬送部材を移動させる搬送動作を行うことで当該搬送部材の搬送面上に載置された記録媒体を搬送する搬送手段と、前記搬送手段により搬送される記録媒体に対してインクを吐出して画像を記録する記録手段と、熱源と、前記熱源を移動させる熱源移動手段と、を備えるインクジェット記録装置の制御方法であって、
前記熱源が前記搬送面の近傍に位置した状態で前記搬送手段により行われている前記搬送動作が当該搬送動作を再開できる態様で停止した場合に、前記熱源と前記搬送面との距離を増大させるように前記熱源移動手段により前記熱源を移動させる熱源移動ステップ
を含むことを特徴としている。
インクジェット記録装置1は、給紙部10と、画像記録部20と、排紙部30と、制御部40(図4)とを備える。インクジェット記録装置1は、制御部40による制御下で、給紙部10に格納された記録媒体Pを画像記録部20に搬送し、画像記録部20で記録媒体Pに画像を記録(形成)し、画像が記録された記録媒体Pを排紙部30に搬送する。記録媒体Pとしては、紙、布帛又はシート状の樹脂等、表面に吐出されたインク(色材)を固着させることが可能な種々の媒体を用いることができる。
搬送部12は、内側が2本のローラー121,122により支持された輪状のベルト123を備える。搬送部12は、ベルト123上に記録媒体Pを載置した状態でローラー121,122を回転させることで記録媒体Pを搬送する。
搬送部21は、搬送ドラム211を回転させるための搬送ドラムモーター214(図4)を備えており、搬送ドラム211は、当該搬送ドラムモーター214の回転量に比例した角度だけ回転する。
搬送ドラム加熱部23は、搬送ドラム211を例えば40℃以上60℃以下の範囲の温度に加熱する。この温度範囲は、後述するインクの加熱温度が70℃以上90℃以下の範囲である場合に記録媒体Pに良好な画質の画像を記録することができる範囲である。本実施形態では、搬送ドラム加熱部23により搬送ドラム211の全体が上記の温度に加熱される態様であるが、これに代えて搬送ドラム211のうち搬送面212を含む一部分が当該温度に加熱される態様であってもよい。
搬送ドラム加熱部23による加熱温度は、インクの種別に応じてインクの加熱温度が変更される場合などにおいて適宜変更されてもよい。また、低温でも良好な画質で画像を記録できる記録媒体Pが用いられる場合には、搬送ドラム加熱部23による加熱温度の下限値は、40℃未満の温度とされてもよい。
記録ヘッド52の各々は、複数の記録素子53を有する。各記録素子53は、インクを貯留する圧力室と、圧力室の壁面に設けられた圧電素子と、ノズルとを備える。記録ヘッド52の駆動回路から圧電素子へ駆動電圧が印加されると、駆動電圧の大きさに応じて圧力室内の圧力が変化し、圧力室に連通するノズルからインクが吐出される。記録素子53のノズルは、ヘッドユニット50の搬送部21側の面(インク吐出面)に開口部が設けられている。図2Bには、記録素子53に含まれるノズルの開口部の一部が点として描かれている。
また、各記録ヘッド52は、X方向に配列された記録素子53の列を2列備えている。従って、各記録ヘッドモジュール51は、当該記録素子53の列を4列備えている。各記録ヘッドモジュール51では、これら4列の記録素子53の各々が全体としてX方向について互いに異なる位置に配置される。なお、本明細書において記録素子53の配列とは、記録素子53のうちノズルの位置の配列を意味するものとする。
なお、図2Aでは、インク加熱部54が記録ヘッド52の外装部材の外側に取り付けられている例が示されているが、インク加熱部54は、記録ヘッド52の外装部材の内側に配置されていてもよい。
本実施形態の記録ヘッド52は、インク加熱部54の熱が当該記録ヘッド52の全体に伝わる構造であり、記録ヘッド52の全体が熱源に対応する。
また、本実施形態で用いられるインクは、上記の特性のほか、紫外線等のエネルギー線を照射することにより硬化する特性を有する。
ヘッドユニット移動機構55は、ヘッドユニット50の-X方向側及び+X方向側に各々配置された一対の支持部56a,56bと、当該支持部56a,56bにそれぞれ取り付けられた取付部材57a,57bとを備える。取付部材57a,57bは、それぞれヘッドユニット50の-X方向側、+X方向側の端部に固定されている。また、取付部材57a,57bは、支持部56a,56bの内部又は外部に設けられた図示しないステッピングモーターの回転を搬送ドラム211の搬送面212と垂直な方向の変位に変換する動力変換機構により搬送面212と垂直な方向に移動するように構成されている。このように構成されたヘッドユニット移動機構55は、取付部材57a,57bに固定されたヘッドユニット50及び当該ヘッドユニット50に含まれる記録ヘッド52を、ステッピングモーターの回転量に比例した距離だけ搬送面212に対して垂直な方向に移動させて、記録ヘッド52のインク吐出面と搬送ドラム211の搬送面212との距離を変化させる。また、ヘッドユニット移動機構55は、ステッピングモーターの回転方向に応じてヘッドユニット50の移動方向を切り替えることができる。
なお、ヘッドユニット移動機構55では、上記のステッピングモーターに代えて、サーボモーター等の他のモーターが用いられてもよい。また、ヘッドユニット移動機構55は、記録ヘッド52と搬送面212との距離が変化するようにヘッドユニット50を移動させるように構成されていればよく、ヘッドユニット50の移動方向は、搬送面212に垂直な方向でなくてもよい。
ここで、動作位置は、搬送部21の基部213との相対位置関係が一定な位置であり、また記録ヘッド52からのインクの吐出により記録媒体Pへの画像の記録が行われる際の記録ヘッド52の位置である。記録ヘッド52が動作位置にある場合の記録ヘッド52と搬送部21の搬送面212との距離は、例えば1mmである。動作位置に配置されインク加熱部54により加熱されている記録ヘッド52は、搬送部21の搬送ドラム211へ熱を伝えることにより搬送ドラム211の温度を上昇させる。本明細書では、熱源から熱が伝わることにより搬送ドラム211の搬送面212における温度が上昇するような当該熱源の位置範囲を搬送面212の近傍とも記す。
また、退避位置は、記録ヘッド52による画像の記録が行われていない場合において、記録ヘッド52から熱が伝わることによる搬送部21の局部的な温度上昇を防止するために記録ヘッド52を退避させた先の位置である。記録ヘッド52が退避位置にある場合の記録ヘッド52と搬送部21の搬送面との距離は、例えば10cmである。記録ヘッド52の退避については後に詳述する。
エネルギー線として紫外線が照射される場合、定着部24の発光部としては、例えば、蛍光管(低圧水銀ランプ、殺菌灯)、冷陰極管、紫外レーザー、数100Paから1MPaまでの動作圧力を有する低圧、中圧、高圧水銀ランプ、メタルハライドランプ、LED(Light Emitting Diode)などが用いられる。
インクジェット記録装置1は、CPU41(Central Processing Unit)(熱源移動制御手段、加熱制御手段、搬送制御手段)、RAM42(Random Access Memory)、ROM43(Read Only Memory)及び記憶部44を含む制御部40と、搬送ドラムモーター214に接続された搬送ドラムモーター制御回路61と、ヘッドユニット移動機構55に接続されたヘッドユニット移動機構制御回路62と、記録ヘッド52に接続された記録ヘッド制御回路63と、外部装置2に接続されたインターフェース64と、インターフェース64に接続された操作表示部65などを備える。CPU41は、バス66を介してRAM42、ROM43、搬送ドラムモーター制御回路61、ヘッドユニット移動機構制御回路62、記録ヘッド制御回路63、インターフェース64と接続されている。
また、画像記録時において、記録ヘッド52は図3Aに示される動作位置に配置される。この動作位置では、記録ヘッド52から搬送ドラム211へ熱が伝わることにより搬送ドラム211の温度の上昇が生じるものの、搬送部21が搬送動作を行っており搬送ドラム211が回転している場合には記録ヘッド52からの熱が搬送ドラム211の搬送面212に対して略均等に伝わるため、搬送ドラム211における温度ムラが生じない。
ここで、退避位置にある記録ヘッド52と搬送面212との距離を退避時距離とし、動作位置にある記録ヘッド52と搬送面212との距離を動作時距離とした場合の退避時距離と動作時距離との差は、記録ヘッド52と搬送ドラム211との温度差が大きいほど大きく設定されてもよい。また、退避時距離と動作時距離との差は、搬送部21の回転の予定停止時間、搬送部21の熱容量の大きさ及び熱伝導率、インクの種別などに基づいて変更されてもよい。
以下では、搬送部21の搬送動作が停止する場合の動作について、通常の画像記録処理及び非常停止処理のそれぞれを例にあげて説明する。
この画像記録処理は、例えばインターフェース64を介して外部装置2から画像データを含む印刷ジョブが制御部40に入力された場合に実行される。
この画像記録処理の開始前に、記録ヘッド52内のインクは、インク加熱部54によりインクの種別に応じた所定の設定温度に加熱される。また、搬送部21の搬送ドラム211は、搬送ドラム加熱部23により所定の設定温度に加熱される。本実施形態では、記録ヘッド52内のインクは、70℃以上90℃以下の範囲に含まれる温度に加熱され、搬送ドラム211は、40℃以上60℃以下の範囲に含まれる温度に加熱される。
ステップS17の処理が終了すると、CPU41は、画像記録処理を終了させる。
この非常停止処理は、画像記録処理が行われているインクジェット記録装置1において所定の異常が生じた場合に実行される。詳しくは、この非常停止処理は、外部装置2又は操作表示部65に対してユーザーにより画像記録動作の停止又は搬送部21の搬送動作の停止を指示する入力操作が行われてインターフェース64を介してCPU41に非常停止指示に係る割り込み要求信号が送信された場合や、上述のインターロック機構が作動してCPU41に当該割り込み要求信号が送信された場合などに実行される割り込み処理である。
なお、ステップS23及びステップS24は、ステップS22においてCPU41が搬送部21の搬送動作を停止させるための処理を行った後、搬送ドラム211の回転が完全に停止する前にステップS22と並行して実行されてもよい。
ステップS26の処理が終了すると、CPU41は、非常停止処理を終了させる。
例えば、上記実施形態では、インク加熱部54により加熱された記録ヘッド52の全体が熱源に対応する例を説明したが、これに限定する趣旨ではなく、インク加熱部54の熱が記録ヘッド52の一部の構成に伝わる構造であり当該一部の構成が熱源に対応する態様であってもよい。
2 外部装置
10 給紙部
11 給紙トレー
12 搬送部
20 画像記録部
21 搬送部
211 搬送ドラム
212 搬送面
213 基部
214 搬送ドラムモーター
22 受け渡しユニット
23 搬送ドラム加熱部
24 定着部
25 デリバリー部
30 排紙部
31 排紙トレー
40 制御部
41 CPU
42 RAM
43 ROM
44 記憶部
50,50Y,50M,50C,50K ヘッドユニット
51 記録ヘッドモジュール
52 記録ヘッド
53 記録素子
54 インク加熱部
55 ヘッドユニット移動機構
56a,56b 支持部
57a,57b 取付部材
61 搬送ドラムモーター制御回路
62 ヘッドユニット移動機構制御回路
63 記録ヘッド制御回路
64 インターフェース
65 操作表示部
66 バス
P 記録媒体
Claims (10)
- 搬送部材を移動させる搬送動作を行うことで当該搬送部材の搬送面上に載置された記録媒体を搬送する搬送手段と、
前記搬送手段により搬送される記録媒体に対してインクを吐出して画像を記録する記録手段と、
熱源と、
前記熱源を移動させる熱源移動手段と、
前記熱源が前記搬送面の近傍に位置した状態で前記搬送手段により行われている前記搬送動作が当該搬送動作を再開できる態様で停止した場合に、前記熱源と前記搬送面との距離を増大させるように前記熱源移動手段により前記熱源を移動させる熱源移動制御手段と、
を備えることを特徴とするインクジェット記録装置。 - 前記記録手段は、前記熱源となる構成を有し、
前記熱源移動手段は、前記記録手段を移動させることで前記熱源を移動させる
ことを特徴とする請求項1記載のインクジェット記録装置。 - 前記記録手段に貯留されて吐出されるインクを加熱するインク加熱手段と、
前記インク加熱手段により前記インクを前記搬送部材の搬送面の温度より高い温度に加熱させる加熱制御手段と、
を備え、
前記記録手段は、前記インク加熱手段の熱を前記熱源となる構成に伝える構造である
ことを特徴とする請求項2記載のインクジェット記録装置。 - 前記加熱制御手段は、前記インク加熱手段により前記インクを前記搬送部材の搬送面の温度より10℃以上高い温度に加熱させることを特徴とする請求項3記載のインクジェット記録装置。
- 前記記録手段に貯留されるインクは、常温でゲル状でありかつ加熱されることでゾル状となる特性を有し、
前記加熱制御手段は、前記インク加熱手段により前記インクをゾル状となる温度に加熱させ、
前記記録手段は、前記インク加熱手段により加熱されたゾル状の前記インクを前記記録媒体に吐出する
ことを特徴とする請求項3又は4記載のインクジェット記録装置。 - 前記記録手段は、前記搬送手段による記録媒体の搬送方向と直交する幅方向に前記記録媒体への当該幅方向の記録幅に亘って当該搬送方向と交差する向きに配列された複数の記録素子からインクを吐出することを特徴とする請求項1~5の何れか一項に記載のインクジェット記録装置。
- 前記搬送部材は、円柱面状の前記搬送面を有し、
前記搬送手段は、前記搬送面を回転させることで前記搬送動作を行う
ことを特徴とする請求項1~6の何れか一項に記載のインクジェット記録装置。 - 前記搬送部材の搬送面を加熱する搬送部材加熱手段を備えることを特徴とする請求項1~7の何れか一項に記載のインクジェット記録装置。
- 所定の異常が生じた場合に前記搬送手段の前記搬送動作を停止させる搬送制御手段を備えることを特徴とする請求項1~8の何れか一項に記載のインクジェット記録装置。
- 搬送部材を移動させる搬送動作を行うことで当該搬送部材の搬送面上に載置された記録媒体を搬送する搬送手段と、前記搬送手段により搬送される記録媒体に対してインクを吐出して画像を記録する記録手段と、熱源と、前記熱源を移動させる熱源移動手段と、を備えるインクジェット記録装置の制御方法であって、
前記熱源が前記搬送面の近傍に位置した状態で前記搬送手段により行われている前記搬送動作が当該搬送動作を再開できる態様で停止した場合に、前記熱源と前記搬送面との距離を増大させるように前記熱源移動手段により前記熱源を移動させる熱源移動ステップ
を含むことを特徴とするインクジェット記録装置の制御方法。
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