CN107953669B - Image forming apparatus with a toner supply device - Google Patents
Image forming apparatus with a toner supply device Download PDFInfo
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- CN107953669B CN107953669B CN201710945779.8A CN201710945779A CN107953669B CN 107953669 B CN107953669 B CN 107953669B CN 201710945779 A CN201710945779 A CN 201710945779A CN 107953669 B CN107953669 B CN 107953669B
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- ink
- forming apparatus
- image forming
- continuous paper
- infrared light
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
- B41J2/455—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using laser arrays, the laser array being smaller than the medium to be recorded
Abstract
The invention discloses an image forming apparatus, comprising: a plurality of color droplet ejection heads arranged in a conveyance direction of the recording medium, the plurality of color droplet ejection heads ejecting inks of different colors to the recording medium, respectively; an infrared light irradiation device which is disposed between the droplet ejection heads of the plurality of colors and irradiates infrared light to the droplets on the recording medium; and a drying device that is provided on a downstream side of a most downstream droplet ejection head in a conveyance direction of the recording medium among the droplet ejection heads of the plurality of colors, and dries the recording medium by heating.
Description
Technical Field
The present invention relates to an image forming apparatus.
Background
Japanese patent application laid-open No. 2011-110922 discloses a printing system that irradiates electromagnetic waves corresponding to respective inkjet heads that eject electromagnetic wave curing inks of respective colors onto a medium to cure the inks on the medium. In this printing system, the irradiation condition of the electromagnetic wave is adjusted according to the amount of ink ejected.
Japanese patent laying-open No. 2013-188920 discloses an ink jet recording apparatus in which an infrared laser beam is irradiated to a medium from each ink jet head that ejects ink of each color, thereby drying the medium. In this apparatus, the concentration of the infrared absorber in the ink and the intensity of the infrared laser are adjusted in the order of ejection so that the arrival temperature of each inkjet head is controlled to be constant.
When the ink ejected onto the medium is dried only by the infrared laser, it is necessary to keep the ink at a high temperature of 100 ℃ or lower for a certain time required for drying so as not to boil and splash the ink, and therefore, it is sometimes necessary to arrange a plurality of infrared lasers in the conveyance direction of the medium and to individually control the temperature.
Disclosure of Invention
An object of the present invention is to provide an image forming apparatus having a simplified apparatus configuration as compared with a configuration in which drying is performed only by using infrared light irradiation devices respectively arranged on downstream sides of droplet ejection heads of a plurality of colors.
According to a first aspect of the present invention, there is provided an image forming apparatus comprising: a plurality of color liquid droplet ejecting heads arranged in a conveying direction of a recording medium, ejecting inks of different colors to the recording medium, respectively; an infrared light irradiation device that is disposed between the droplet ejection heads of the plurality of colors and irradiates infrared light to the droplets on the recording medium; and a drying device that is provided on a downstream side of a most downstream droplet ejection head in a conveyance direction of the recording medium among the droplet ejection heads of the plurality of colors, and dries the recording medium by heating.
According to a second aspect of the present invention, in the image forming apparatus, the liquid droplet ejection heads other than the most downstream liquid droplet ejection head eject ink containing an infrared absorbing material or black ink.
According to a third aspect of the present invention, in the image forming apparatus, the most downstream liquid droplet ejection head ejects ink containing no infrared absorbing material.
According to a fourth aspect of the present invention, in the image forming apparatus, the ink not containing the infrared absorbing material is a light-colored ink.
According to a fifth aspect of the present invention, in the image forming apparatus, the droplet ejection head that ejects black ink is arranged at a position other than the most downstream droplet ejection head, and when a monochrome image is formed by the black ink ejected from the droplet ejection head, operation of either the infrared light irradiation device or the drying device is selected.
According to a sixth aspect of the present invention, in the image forming apparatus, a droplet ejection head ejecting ink containing two or more kinds of infrared absorbing materials is disposed on a downstream side of the droplet ejection head ejecting black ink, and when a monochrome image is formed by the black ink ejected from the droplet ejection head ejecting black ink, a position and the number of the infrared light irradiation devices that operate can be selected.
According to a seventh aspect of the present invention, in the image forming apparatus, the inks of different colors respectively ejected from the plurality of color droplet ejection heads are water-based inks.
According to the first aspect, the device configuration can be simplified as compared with a configuration in which drying is performed using only infrared light irradiation devices disposed respectively on the downstream side of the droplet ejection heads of the plurality of colors.
According to the second aspect, the recording medium on which the ink is ejected from the droplet ejection heads of the respective colors can be temporarily dried by the infrared light irradiation device on the downstream side of the droplet ejection heads of the respective colors.
According to the third aspect described above, the color turbidity of the ink ejected from the most downstream liquid droplet ejecting head can be suppressed as compared with a configuration in which the most downstream liquid droplet ejecting head ejects the ink containing the infrared absorbing material.
According to the fourth aspect described above, the color turbidity of the light-colored ink can be suppressed as compared with the structure in which the ink containing the infrared absorbing material is the light-colored ink.
According to the fifth aspect described above, the recording medium on which the black ink is ejected can be dried by the appropriate infrared light irradiation device or drying device, as compared with a configuration in which the operation of either the infrared light irradiation device or the drying device cannot be selected when forming a monochrome image.
According to the sixth aspect, as compared with a configuration in which only one droplet ejection head that ejects ink containing an infrared absorbing material is disposed downstream of a droplet ejection head that ejects black ink, an appropriate drying mode can be selected for drying a recording medium that ejects black ink.
According to the seventh aspect, the aqueous ink is easily ejected from the droplet ejection heads of the plurality of colors, as compared with a configuration in which the ink ejected from the droplet ejection heads of the plurality of colors, respectively, is oil-based ink.
Drawings
Embodiments of the present invention will be described in detail based on the following drawings, in which:
fig. 1 is a schematic side view showing an image forming apparatus according to an embodiment;
FIG. 2 is a schematic side view showing a state in which a monochrome image is formed by an ink jet recording head of black ink in the image forming apparatus shown in FIG. 1; and
fig. 3 is a graph showing a relationship between an arrival temperature of laser intensity of the infrared laser light irradiated from the infrared light irradiation device to the continuous paper and a residual moisture content of the continuous paper.
Detailed Description
Hereinafter, an embodiment of an image forming apparatus according to the present invention will be described with reference to the drawings. In the drawings, the direction indicated by an arrow UP is an upward direction in the vertical direction of the image forming apparatus. Hereinafter, the transport direction of the recording medium is simply referred to as "transport direction", and the upstream side in the transport direction and the downstream side in the transport direction are simply referred to as "upstream side" and "downstream side", respectively. In the present specification, when there is a numerical range expressed by using "to", the numerical range refers to a range including numerical values described before and after "to" as a lower limit value and an upper limit value.
[ integral Structure of image Forming apparatus ]
Fig. 1 is a side view of an image forming apparatus 10 according to an embodiment. As shown in fig. 1, the image forming apparatus 10 is an ink jet recording apparatus that forms an image on a recording medium by ejecting liquid droplets.
The image forming apparatus 10 includes a paper feed roller 20 and a winding roller 22. The paper feed roller 20 feeds the continuous paper P, which is an example of a recording medium, on the most upstream side in the conveying direction of the continuous paper P. The winding roller 22 winds the continuous paper P at the most downstream side in the conveyance direction of the continuous paper P. The continuous paper P is conveyed in the direction of arrow a by a paper feed roller 20, a take-up roller 22, and a plurality of conveying rollers 24 described later.
The image forming apparatus 10 further includes an ink jet recording head 12 (hereinafter, simply referred to as "recording head") for a plurality of colors, an infrared light irradiation device 14, and a drying device 16. The recording head 12 is an example of a droplet discharge head that discharges droplets to the continuous paper P. The infrared light irradiation device 14 is disposed between the recording heads 12 of the plurality of colors, and irradiates infrared light to the continuous paper P. The drying device 16 is disposed on the downstream side of the most downstream recording head 12. The image forming apparatus 10 further includes a control device 18, and the control device 18 controls the operations of the infrared irradiation device 14 and the drying device 16. Between the paper feed roller 20 and the winding roller 22, a plurality of conveyance rollers 24 are provided, and the plurality of conveyance rollers 24 contact the continuous paper P on the opposite side of the droplet ejection surface of the continuous paper P and convey the continuous paper P. The conveying roller 24 is disposed offset to the upper side (the side of the recording head 12) with respect to the paper feed roller 20 and the take-up roller 22 so as to apply tension to the continuous paper P.
The long continuous paper P is wound around the paper feed roller 20. The continuous paper P drawn out from the paper feed roller 20 is conveyed in the arrow a direction along with the rotation of the plurality of conveying rollers 24. The continuous paper P conveyed by the conveying roller 24 is finally wound up by the rotation of the winding roller 22.
In the present embodiment, the recording heads 12 include recording heads 12K, 12C, 12M, and 12Y that eject droplets corresponding to respective colors of black (K), cyan (C), magenta (C), and yellow (Y). In the present embodiment, the recording heads 12K, 12C, 12M, and 12Y are arranged in this order with intervals from the upstream side to the downstream side in the conveyance direction of the continuous paper P. 12K, 12C, 12M, and 12Y are arranged with the width direction of the continuous paper P as the longitudinal direction, and the length of each recording head exceeds the width of the continuous paper P. The recording heads 12K, 12C, 12M, and 12Y eject droplets of respective colors from a plurality of nozzles, respectively, to form images of respective colors on the continuous paper P. In addition, in the case where there is no need to distinguish between the respective colors of KCMY, they are collectively referred to as "recording head 12".
The image forming apparatus 10 is provided with four containers (not shown) for storing ink corresponding to the respective colors of the recording heads 12K, 12C, 12M, and 12Y. The four tanks supply the stored inks to the recording heads 12K, 12C, 12M, 12Y of the corresponding colors.
The infrared light irradiation device 14 is disposed between the four color recording heads 12K, 12C, 12M, and 12Y, and in the present embodiment, includes three infrared light irradiation devices 14A, 14B, and 14C. More specifically, the infrared light irradiation device 14 includes an infrared light irradiation device 14A disposed between the recording head 12K and the recording head 12C, an infrared light irradiation device 14B disposed between the recording head 12C and the recording head 12M, and an infrared light irradiation device 14C disposed between the recording head 12M and the recording head 12Y. Thus, the recording head 12K, the infrared light irradiation device 14A, the recording head 12C, the infrared light irradiation device 14B, the recording head 12M, the infrared light irradiation device 14C, the recording head 12Y, and the drying device 16 are arranged in this order from the upstream side in the conveyance direction of the continuous paper P, facing the continuous paper P. When the infrared light irradiation devices 14A, 14B, and 14C do not need to be distinguished, they are collectively referred to as "infrared light irradiation device 14".
The infrared light irradiators 14A, 14B, and 14C include a plurality of laser elements (not shown), and irradiate the continuous paper P on which the droplets are ejected by the recording head 12 with infrared light (infrared laser light) from the plurality of laser elements. The infrared light irradiation devices 14A, 14B, and 14C function as auxiliary dryers for temporarily drying the droplets ejected onto the continuous paper P from the recording heads 12K, 12C, and 12M immediately before in the conveyance direction of the continuous paper P. The control device 18 is electrically connected to the infrared light irradiation devices 14A, 14B, and 14C, and controls irradiation energy or irradiation timing of the infrared light irradiation devices 14A, 14B, and 14C.
The infrared light irradiation devices 14A, 14B, and 14C can be applied without limitation as long as they are infrared laser beams having an oscillation wavelength in a region of, for example, 780nm to 1100 nm. The infrared irradiation devices 14A, 14B, and 14C can be applied with infrared laser light such as semiconductor laser light, solid laser light, gas laser light, and dye laser light, and can be provided with a condensing optical system, and can be provided with high-power LEDs.
The recording heads 12C and 12M eject ink containing an infrared absorbing agent as an example of an infrared absorbing material, onto the recording heads 12 other than the recording head 12Y located most downstream in the conveyance direction of the continuous paper P. That is, the cyan and magenta inks ejected from the recording heads 12C and 12M, respectively, contain an infrared absorber. In the present embodiment, the cyan and magenta inks are water-based inks containing colorants of corresponding colors, the infrared absorbers, and water-based solvents. The aqueous ink has a low viscosity compared to the oil-based ink, and is easy to eject droplets from the recording heads 12C and 12M.
In the present embodiment, the infrared absorber contained in the ink of each color has a maximum absorption wavelength that is the same as or close to the oscillation wavelength of the infrared light (infrared laser light) irradiated first after the ink is ejected. More specifically, the infrared absorber contained in the cyan ink has a maximum absorption wavelength that is the same as or close to the oscillation wavelength of the infrared light (infrared laser light) of the infrared light irradiation device 14B disposed immediately after the recording head 12C in the conveyance direction of the continuous paper P. Thereby, the infrared absorber contained in the cyan ink ejected from the recording head 12C toward the continuous paper P absorbs the infrared light (infrared laser light) irradiated from the infrared light irradiation device 14B. The infrared absorber absorbs infrared light (infrared laser light), and the temperature of the water in the cyan ink ejected onto the continuous paper P is raised to evaporate at least a part of the water, thereby temporarily drying the continuous paper P.
The infrared absorber contained in the magenta ink has a maximum absorption wavelength that is the same as or close to the oscillation wavelength of the infrared light (infrared laser light) of the infrared light irradiator 14C disposed immediately after the recording head 12M in the transport direction of the continuous paper P. Thereby, the infrared absorber contained in the magenta ink ejected from the recording head 12M toward the continuous paper P absorbs the infrared light (infrared laser light) irradiated from the infrared light irradiation device 14C. The infrared absorber absorbs infrared light (infrared laser light), and the moisture in the magenta ink ejected onto the continuous paper P is heated to evaporate at least a part of the moisture, thereby temporarily drying the continuous paper P.
The infrared absorber contained in the cyan and magenta inks can be selected from, for example, those described in Japanese patent application laid-open No. 2015-142373.
The black ink (which may be referred to as "black ink" in this specification) ejected from the recording head 12K does not contain an infrared absorber. That is, the recording head 12K disposed at the most upstream side among the recording heads 12 other than the recording head 12Y at the most downstream side in the conveyance direction of the continuous paper P ejects black ink. In the present embodiment, the recording heads 12C and 12M that eject inks containing two or more types of infrared absorbers are disposed downstream of the recording head 12K that ejects black ink. Black ink has the property of absorbing infrared light (infrared laser light). Therefore, the black ink ejected onto the continuous paper P absorbs the infrared light (infrared laser light) irradiated from the infrared light irradiation devices 14A, 14B, and 14C. The black ink absorbs infrared light (infrared laser light), and the moisture in the black ink ejected on the continuous paper P is heated to evaporate at least a part of the moisture, thereby temporarily drying the continuous paper P.
In the present embodiment, the black ink is an aqueous ink containing a colorant of a corresponding color and a water-based solvent.
Further, the recording head 12Y located most downstream in the conveyance direction of the continuous paper P among the plurality of recording heads 12 ejects ink containing no infrared absorbing material. That is, the yellow ink ejected from the most downstream recording head 12Y does not contain an infrared absorber. Here, yellow ink containing no infrared absorbing material is an example of a light-colored ink. The light color ink is an ink having an intensity of a maximum value in an absorption spectrum of 1/2 to 1/10 and a low concentration of a coloring material, relative to inks of various colors. In the present embodiment, the yellow ink does not contain an infrared absorber, and thereby color turbidity of the yellow ink is suppressed.
In the present embodiment, the yellow ink is an aqueous ink containing a colorant of a corresponding color and a water-based solvent.
The drying device 16 is disposed downstream of the most downstream recording head 12Y in the conveyance direction of the continuous paper P among the plurality of recording heads 12. The drying device 16 has a function as a main drying device, and dries (main drying) the continuous paper P by heating and evaporating moisture in the droplets of all colors repeatedly ejected onto the continuous paper P. In the present embodiment, the drying device 16 dries the image so as not to contact the image formed by the droplets on the continuous paper P (the surface of the continuous paper P on which the image is formed). The drying device 16 uses a heating system such as a drum, a heater, or hot air, instead of a system that heats or cures only at a specific wavelength as in the infrared irradiation device 14. The drying device 16 of the present embodiment includes a heat source such as an infrared lamp, for example, and dries the continuous paper P by heating and evaporating moisture in the droplets on the continuous paper P.
The drying device 16 may be configured to include, for example, a hot air blower that blows hot air to the droplets on the continuous paper P instead of the heat source such as the infrared lamp, and dry the continuous paper P by blowing hot air to evaporate moisture in the droplets on the continuous paper P. The drying device may be configured to include, instead of the infrared lamp or the hot air blower, a heating drum that contacts the continuous paper P from the side opposite to the side on which the image is formed on the continuous paper P, and dry the continuous paper P by evaporating moisture in the droplets on the continuous paper P by the heating drum.
The control device 18 is electrically connected to the drying device 16 and controls the operation of the drying device 16. When forming a color image, the control device 18 operates all of the infrared light irradiation devices 14A, 14B, and 14C and the drying device 16.
Further, when a monochrome image is formed by the black ink ejected from the recording head 12K, the control device 18 selects the operation of either the infrared light irradiation device 14 or the drying device 16. At this time, when the infrared light irradiation device 14 is selected, the control device 18 selects the position and the number of the infrared light irradiation devices 14 to be operated, that is, which of the infrared light irradiation devices 14A, 14B, and 14C is to be operated.
For example, when one or more of the infrared light irradiation devices 14A, 14B, and 14C are operated, the wetting and spreading of the image on the continuous paper P and the deformation of the continuous paper P can be suppressed as compared with the drying device 16, and high image density can be obtained. The control device 18 selects which of the plurality of infrared light irradiation devices 14A, 14B, and 14C is to be operated, based on the amount of black droplets ejected onto the continuous paper P, the image forming speed, and the like. In addition, for example, in the case of using the continuous paper P having a property of absorbing infrared wavelengths, or in the case of performing pre-printing (printing before main printing) on the continuous paper P, the control device 18 selects the drying device 16. That is, the control device 18 selects one or more of the infrared light irradiation devices 14A, 14B, and 14C or selects an appropriate drying mode for operating the drying device 16, according to the type of the continuous paper P, the type of printing such as pre-printing, the nature of the image such as the amount of black droplets, the image forming speed, and the like.
[ actions and effects ]
Next, the operation and effect of the present embodiment will be described.
As shown in fig. 1, in the image forming apparatus 10, when a color image is formed, liquid droplets in a black color are ejected by the recording head 12K on the continuous paper P drawn out from the paper feed roller 20. Then, infrared light (infrared laser light) is irradiated from an infrared light irradiation device 14A disposed immediately downstream of the recording head 12K onto the continuous paper P onto which the liquid droplets having the black color are ejected. Thereby, the moisture in the liquid droplets of the black color sprayed on the continuous paper P is heated to evaporate at least a portion of the moisture, so that the continuous paper P is temporarily dried.
Thereafter, droplets of cyan are ejected on the continuous paper P by the recording head 12C. Then, infrared light (infrared laser light) is irradiated from an infrared light irradiation device 14B disposed immediately downstream of the recording head 12C onto the continuous paper P on which droplets of cyan are ejected. Thus, the temperature of the water in the droplets of cyan ejected on the continuous paper P is raised, and at least a part of the water is evaporated, thereby temporarily drying the continuous paper P.
After that, on the continuous paper P, magenta droplets are ejected by the recording head 12M. Then, infrared light (infrared laser light) is irradiated from an infrared light irradiation device 14C disposed immediately downstream of the recording head 12M onto the continuous paper P on which magenta droplets are ejected. Thus, the moisture in the magenta droplets ejected on the continuous paper P is heated to evaporate at least a part of the moisture, and the continuous paper P is temporarily dried.
Further, on the continuous paper P, droplets of yellow are ejected by the recording head 12Y. Thereafter, the continuous paper P on which the yellow droplets are ejected is dried by the drying device 16 disposed immediately downstream of the recording head 12Y. The drying device 16 includes a heat source such as an infrared lamp, and heats and evaporates moisture in all the droplets (yellow droplets and droplets of other colors) on the continuous paper P to dry the continuous paper P.
Thereafter, the continuous paper P on which the droplets of the image have been dried is wound around the winding roller 22, whereby the image formation on the continuous paper P is completed.
Next, a case where a monochrome image is formed by the recording head 12K will be described.
As shown in fig. 2, in the image forming apparatus 10, when a monochrome image is formed, liquid droplets in a black color are ejected by the recording head 12K on the continuous paper P drawn out from the paper feed roller 20. In order to dry the continuous paper P onto which the liquid droplets having a black color are ejected, the control device 18 selects the operation of either the infrared light irradiation device 14 or the drying device 16. For example, when the drying device 16 is selected, the control device 18 dries the continuous paper P on which the liquid droplets of black are ejected by the drying device 16 disposed downstream of the most downstream recording head 12Y. The drying device 16 includes a heating source such as an infrared lamp, and heats the continuous paper P to evaporate the moisture in the black liquid droplets, thereby drying the continuous paper P.
On the other hand, when the infrared light irradiation device 14 is selected, the control device 18 selects which of the infrared light irradiation devices 14A, 14B, and 14C is to be operated. For example, when all the infrared light irradiation devices 14A, 14B, and 14C are operated, infrared light (infrared laser light) is irradiated from each of the infrared light irradiation devices 14A, 14B, and 14C to the continuous paper P on which the liquid droplets in the black color are ejected, and thereby moisture in the liquid droplets in the black color ejected on the continuous paper P is heated and evaporated, and the continuous paper P is dried.
The image forming apparatus 10 includes three infrared light irradiation devices 14A, 14B, and 14C arranged between the four color recording heads 12K, 12C, 12M, and 12Y, and a drying device 16 arranged downstream of the most downstream recording head 12Y. Therefore, in the image forming apparatus 10, the apparatus configuration can be simplified as compared with a configuration in which drying is performed using only the infrared light irradiation devices disposed respectively on the downstream side of the droplet ejection heads of the plurality of colors.
In the image forming apparatus 10, the recording heads 12K, 12C, and 12M other than the most downstream recording head 12Y eject ink containing an infrared absorber or black ink. Therefore, in the image forming apparatus 10, the infrared light irradiation devices 14A, 14B, and 14C on the downstream side of the recording heads 12K, 12C, and 12M of the respective colors can temporarily dry the continuous paper P on which the inks are ejected from the recording heads 12K, 12C, and 12M of the respective colors.
In the image forming apparatus 10, the most downstream recording head 12Y ejects ink containing no infrared absorber. Therefore, in the image forming apparatus 10, the color turbidity of the yellow ink ejected from the most downstream recording head 12Y can be suppressed as compared with a configuration in which the most downstream liquid droplet ejection head ejects ink containing an infrared absorbing material.
In addition, in the image forming apparatus 10, the ink containing no infrared absorber is a light-colored ink (i.e., yellow ink). Therefore, in the image forming apparatus 10, the color turbidity of the light-colored ink can be suppressed as compared with a configuration in which the ink containing the infrared absorbing material is the light-colored ink.
In the image forming apparatus 10, when a monochrome image is formed, the operation of either the infrared light irradiation device 14 or the drying device 16 is selected. Therefore, in the image forming apparatus 10, when a monochrome image is formed, the continuous paper P on which the black ink is ejected can be dried by the infrared light irradiation device 14 or the drying device 16 as appropriate, as compared with a configuration in which the operation of either the infrared light irradiation device or the drying device is not selected. That is, in the case of forming a monochrome image, for example, by selecting the operation of the infrared light irradiation device 14, the wet diffusion and the deformation of the continuous paper P can be suppressed, and by selecting the operation of the drying device 16, the continuous paper P absorbing the infrared wavelength can be handled, as compared with a configuration in which the operation of either the infrared light irradiation device or the drying device is not selected. In addition, in the image forming apparatus 10, when a monochrome image is formed, the running cost can be reduced as compared with a configuration in which the operation of either the infrared light irradiation device or the drying device is not selected.
In the image forming apparatus 10, when a monochrome image is formed by the black ink ejected from the recording head 12K, the positions and the number of the infrared light irradiation devices 14A, 14B, and 14C to be operated can be selected. Therefore, in the image forming apparatus 10, compared to a configuration in which only one droplet ejection head that ejects ink containing an infrared absorbing material is disposed downstream of a droplet ejection head that ejects black ink, an appropriate drying mode for drying the continuous paper P that ejects black ink can be selected.
In the image forming apparatus 10, the recording heads 12K, 12C, 12M, and 12Y of the plurality of colors eject aqueous inks. Therefore, in the image forming apparatus 10, the aqueous ink is easily ejected from the recording heads 12K, 12C, 12M, and 12Y of the plurality of colors, as compared with a configuration in which the ink ejected from the droplet ejection heads of the plurality of colors is oil-based ink.
In the present embodiment, the image forming apparatus 10 that forms an image on the continuous paper P is used, but the present invention is not limited to the image forming apparatus that forms an image on the continuous paper P. For example, the present invention can also be applied to an image forming apparatus that sequentially conveys sheets of paper to form an image. The recording medium on which the image is formed is not limited to paper, and a recording medium such as a film may be used.
In the image forming apparatus 10 of the present embodiment, the recording heads 12K, 12C, 12M, and 12Y that eject black, cyan, magenta, and yellow inks are used, but the present invention is not limited to such a configuration. For example, the color of the ink may be changed to a different color, and a droplet ejecting head for ejecting a different ink may be added. The image forming apparatus may include five droplet ejection heads that eject white ink in addition to black, cyan, magenta, and yellow, for example.
The image forming apparatus may include five droplet ejection heads that eject black, cyan, magenta, yellow, and white inks, for example, and the droplet ejection head that ejects the white ink may be disposed at the most downstream side. In this configuration, for example, the white ink may be an ink containing no infrared absorbing material, and the yellow ink ejected from the droplet ejection head on the upstream side of the white droplet ejection head may be an ink containing an infrared absorbing material.
In the image forming apparatus 10 of the present embodiment, the recording heads 12C and 12M for ejecting ink containing two or more kinds of infrared absorbing materials are disposed on the downstream side of the recording head 12K for ejecting black ink, but the present invention is not limited to this configuration. For example, the recording head 12K that ejects black ink may be changed to a position other than the most downstream recording head.
Examples
Next, an experiment for examining the relationship between the arrival temperature of an image formed by droplets on the continuous paper P and the residual moisture content of the continuous paper P with respect to the state of the image quality of the image formed by the image forming apparatus and the laser intensity of the infrared light irradiation apparatus will be described.
In this experiment, the distances between the recording heads 12K, 12C, 12M, 12Y on the image forming apparatus 10 (e.g., the distance from the upstream side surface of the recording head 12K to the upstream side surface of the next recording head 12C) were set to 100mm (the speed of the continuous paper P was 0.96 sec). The length of the infrared light irradiation device 14 in the conveyance direction of the continuous paper P is set to 20mm (the speed of the continuous paper P is 0.19 sec).
Further, OKT110 (manufactured by king paper co., ltd.) was used as the continuous paper P. The inks were set to two colors, printing cyan first and magenta second. The amount of droplets was set to 2.0pl and 1200dpi (dots/inch). The conveying speed of the continuous paper P was set to 6.25 m/min.
When forming images of two colors using the image forming apparatus 10, the arrival temperature of the droplets of the continuous paper P is 60 to 65 ℃ immediately after the infrared light irradiation device 14B after cyan and 80 to 85 ℃ immediately after the infrared light irradiation device 14C after magenta.
In addition, the image quality of the image was examined in the case where the laser irradiation was performed by the infrared light irradiation device and in the case where the laser irradiation was not performed by the infrared light irradiation device (only the drying device 16 was used). As a result, it was confirmed that when the infrared light irradiation device irradiates the laser light, it is possible to suppress line distortion (distortion), feathering (feathering) such as ink bleeding, and color mixing of the image, as compared with the case where the infrared light irradiation device does not irradiate the laser light.
Fig. 3 is a graph for examining the relationship between the arrival temperature of an image formed by droplets on the continuous paper P and the residual moisture content of the continuous paper P with respect to the laser intensity of the infrared irradiation device. In fig. 3, the laser intensity of the infrared light irradiation device was changed, and the arrival temperature of the image on the continuous paper P and the residual moisture content of the continuous paper P were measured. In this experiment, black ink K365 was used as the ink. As the continuous paper P, OKT110 (manufactured by wangzi paper corporation) was used. The amount of droplets was set to 2.0 pl.
As shown in fig. 3, by irradiating the laser beam with the infrared light irradiation device 14 between the color spaces, the moisture in the liquid droplets was evaporated by 30 to 50%, and thereby the image degradation was suppressed.
Further, although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to the embodiments, and it is apparent to those skilled in the art that other various embodiments may be implemented within the scope of the present invention. Power supply and signal wiring traces for supplying power to the respective laser elements are omitted.
The foregoing description of the embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. It is apparent that many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to understand the invention for various embodiments and with the various modifications as are suited to the particular use contemplated. The scope of the invention is defined by the claims and their equivalents, which are filed concurrently with this specification.
Claims (6)
1. An image forming apparatus, comprising:
a plurality of color liquid droplet ejecting heads arranged in a conveying direction of a recording medium, ejecting inks of different colors to the recording medium, respectively;
an infrared light irradiation device that is disposed between adjacent ones of the plurality of color droplet ejection heads and irradiates infrared light onto the droplets on the recording medium; and
a drying device that is provided on a downstream side of a most downstream droplet ejection head in a conveyance direction of the recording medium among the plurality of color droplet ejection heads, dries the recording medium by heating,
the most downstream droplet ejection head ejects ink containing no infrared absorbing material.
2. The image forming apparatus according to claim 1,
the liquid droplet ejection heads other than the most downstream liquid droplet ejection head eject ink containing an infrared absorbing material or black ink.
3. The image forming apparatus according to claim 1,
the ink not containing the infrared absorbing material is a light colored ink.
4. The image forming apparatus according to claim 1,
the liquid droplet ejecting head ejecting the black ink is disposed at a position other than the most downstream liquid droplet ejecting head,
when a monochrome image is formed by the black ink ejected from the droplet ejection head, either the infrared light irradiation device or the drying device is selected to operate.
5. The image forming apparatus according to claim 4,
a droplet ejecting head for ejecting ink containing two or more kinds of infrared absorbing materials is disposed on a downstream side of the droplet ejecting head for ejecting black ink,
when a monochrome image is formed by the black ink ejected from the droplet ejection head which ejects the black ink, the position and the number of the infrared light irradiation devices which perform the operation can be selected.
6. The image forming apparatus according to claim 1,
the inks of different colors respectively ejected from the droplet ejection heads of the plurality of colors are water-based inks.
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| JP2016-203745 | 2016-10-17 | ||
| JP2016203745A JP6852346B2 (en) | 2016-10-17 | 2016-10-17 | Image forming device |
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| CN107953669A CN107953669A (en) | 2018-04-24 |
| CN107953669B true CN107953669B (en) | 2021-04-13 |
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| CN201710945779.8A Active CN107953669B (en) | 2016-10-17 | 2017-10-12 | Image forming apparatus with a toner supply device |
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| Country | Link |
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| JP (1) | JP6852346B2 (en) |
| CN (1) | CN107953669B (en) |
| AU (1) | AU2017245346B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6967280B2 (en) | 2018-07-25 | 2021-11-17 | 株式会社ミヤコシ | Ink dryer |
| JP2020040353A (en) * | 2018-09-13 | 2020-03-19 | 大阪シーリング印刷株式会社 | Printing device |
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Also Published As
| Publication number | Publication date |
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| JP6852346B2 (en) | 2021-03-31 |
| AU2017245346A1 (en) | 2018-05-10 |
| JP2018065262A (en) | 2018-04-26 |
| AU2017245346B2 (en) | 2018-08-16 |
| CN107953669A (en) | 2018-04-24 |
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