JP5065918B2 - Drying apparatus and ink jet recording apparatus provided with the drying apparatus - Google Patents

Description

  The present invention relates to a drying device in an ink jet recording apparatus that performs recording by ejecting ink onto a recording medium such as paper in a recording apparatus such as a facsimile, a copying machine, and a printer.

  Recording apparatuses such as facsimiles, copiers, and printers are configured to record images on recording media such as paper, cloth, and OHP sheets. However, depending on the recording method, inkjet, wire dot, thermal It can be classified into formulas and the like. These recording methods can be further classified into a serial type in which recording is performed while the recording head scans the recording medium, and a line head type in which recording is performed by a recording head fixed to the apparatus main body.

  For example, in a line head type ink jet recording apparatus, each of the line heads having a recording area equal to or larger than the width of the recording medium while conveying the recording medium such as paper at a high speed by a conveying means such as a conveying belt provided in the apparatus main body. An image is formed on the recording medium by ejecting ink from the ink ejection nozzle. As a result, high-speed printing is possible as compared with an ink jet recording apparatus of a serial type ink jet head in which the recording head reciprocates in the width direction of the recording medium.

  In such an ink jet printer, means for drying ink ejected onto a recording medium has been proposed. For example, Patent Document 1 discloses a first drying unit (drying device) that is located upstream of the line head in the conveyance direction of the recording medium and that heats and dries the recording medium from the non-recording surface, and a downstream side of the line head. And a second drying unit that heats the recording medium from the non-recording surface side after printing, and a third drying unit that heats the recording medium in a non-contact manner from the recording surface side. A line-type ink jet printer (recording apparatus) including the drying means is disclosed.

Such a line-type ink jet printer dries and fixes the ink without increasing the size of the printer even for a printer with a high printing speed, thereby preventing a decrease in print quality.
JP 2002-347226 A

  However, at present, the speed of printing is increasing more and more, and it may be difficult to sufficiently dry the recording medium by the method of Patent Document 1. Electric facilities such as general offices have a limited power capacity, and it is difficult to supply a large amount of power to the drying device. Further, in order to dry the recording medium with a small amount of electric power, it is necessary to lengthen the drying time sufficiently, and in order to lengthen the drying time, it is necessary to enlarge the apparatus. For example, when a recording medium is transported at 1 m / sec, the length of the drying device in the recording medium transport direction needs to be 5 m or more in order to ensure a drying time of 5 seconds.

  SUMMARY OF THE INVENTION In view of the above circumstances, the present invention is provided with a drying device capable of avoiding an increase in size of the device while suppressing power required for drying and sufficiently drying ink ejected onto a recording medium, and the same. Another object of the present invention is to provide an ink jet recording apparatus.

  In order to achieve the above object, the present invention provides a drying apparatus for drying ink ejected on a recording medium, the first conveying means for conveying the recording medium in a first conveying direction, and the first conveying. One or more second conveying means for conveying in the second conveying direction opposite to the direction are arranged alternately at a predetermined interval in the vertical direction, and the upstream end of the second conveying means in the conveying direction Is arranged on the downstream side in the first transport direction with respect to the downstream end portion in the transport direction of the first transport means positioned immediately above, and the upstream end portion in the transport direction of the first transport means is positioned directly above. It is characterized in that it is arranged on the downstream side in the second transport direction with respect to the downstream end portion in the transport direction of the second transport means.

  Further, the present invention provides an interval between the upstream end of the second transport unit and the downstream end of the first transport unit, and the upstream end of the first transport unit and the second transport. The distance between the means and the downstream end is larger than the maximum transportable length of the recording medium.

  Further, the present invention is characterized in that an air blowing means for bringing an air flow into contact with the recording medium is provided.

  In addition, the present invention is characterized in that a first heating means for heating the recording medium is provided.

  According to the present invention, the first and second conveying means adsorb the recording medium to the conveying belt, an endless conveying belt that conveys the recording medium, a driving roller and a driven roller that span the conveying belt, and the recording medium. It is characterized by comprising adsorbing means.

  The present invention also provides the drying device, a recording medium container, a recording head for ejecting ink onto the recording medium, and the recording medium accommodated in the container to the recording head and the drying device. An ink jet recording apparatus comprising: a third transport unit, wherein the ink ejected onto the recording medium by the recording head is dried by the drying apparatus.

  The present invention also provides a second heating means for heating the recording medium accommodated in the accommodating portion, and heating and blowing air to the recording medium immediately adjacent to the recording head downstream in the recording medium conveying direction of the third conveying means. Heating air blowing means is provided.

  According to the first configuration of the present invention, the first transport unit that transports the recording medium in the first transport direction, and the second transport unit that transports the recording medium in the second transport direction opposite to the first transport direction. Are arranged alternately at a predetermined interval in the vertical direction, and the upstream end in the transport direction of the second transport means is more downstream than the downstream end in the transport direction of the first transport means located immediately above. It arrange | positions in the 1st conveyance direction downstream, and the conveyance direction upstream edge part of a 1st conveyance means is 2nd conveyance direction downstream rather than the conveyance direction downstream edge part of the 2nd conveyance means located immediately above. By disposing the recording medium, the recording medium can be moved from the upper side to the lower side while sequentially changing the conveying direction to the opposite side.

  As a result, the transport distance of the recording medium on which ink is ejected can be increased in a small space, and the drying time of the recording medium can be extended. Therefore, power required for drying can be suppressed. Further, it is possible to avoid the enlargement of the apparatus and to sufficiently dry the ink ejected onto the recording medium. Furthermore, it is possible to cope with high-speed printing.

  According to the second configuration of the present invention, in the drying device of the first configuration, the distance between the upstream end of the second transport unit and the downstream end of the first transport unit, and the first By making the interval between the upstream end of the first transport unit and the downstream end of the second transport unit larger than the maximum transportable length of the recording medium, the first transport unit and the second transport unit It becomes easy to support the recording medium dropped from the downstream end of the means at the upstream end of the second and first transport means, respectively. Thereby, the recording medium can be easily moved downward. Further, it is possible to further avoid the recording surface of the recording medium coming into contact with the first and second conveying means and the peripheral member. Accordingly, it is possible to easily dry the ink on the paper P and to prevent the quality of the printed image from being deteriorated.

  According to the third configuration of the present invention, in the drying apparatuses having the first and second configurations, the air on the recording medium is efficiently provided by providing the air blowing means for contacting the recording medium. Can be dried.

  According to the fourth configuration of the present invention, in the drying apparatus having any one of the first to third configurations, the recording medium is efficiently dried by providing the first heating means for heating the recording medium. can do.

  Moreover, according to the fifth configuration of the present invention, in the drying device having any one of the first to fourth configurations, the first and second transport means may be endless transport belts that transport the recording medium; The recording medium can be transported with a simple configuration by comprising the driving roller and the driven roller on which the transport belt is stretched, and the suction means for attracting the recording medium to the transport belt.

  According to the sixth configuration of the present invention, the drying device having any one of the first to fifth configurations, the storage unit for the recording medium, the recording head for ejecting ink onto the recording medium, and the storage unit And a third transport means for transporting the recording medium contained in the recording head to the recording head and the drying device, and an ink jet recording device that dries the ink ejected onto the recording medium by the recording head by the drying device. The medium can be sufficiently dried.

  According to the seventh configuration of the invention, in the inkjet recording apparatus of the sixth configuration, the second heating unit that heats the recording medium stored in the storage unit, and the third transport unit with respect to the recording head. By providing a heating air blowing means for heating and blowing air to the recording medium in the immediate vicinity of the downstream side in the recording medium conveying direction, the recording medium can be efficiently dried.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic front sectional view showing a schematic structure of an ink jet printer which is an example of an ink jet recording apparatus in which a drying apparatus of the present invention is disposed. FIG. 2 is a schematic front sectional view showing a schematic structure of the drying apparatus of the present embodiment, and FIG. 3 is a schematic sectional view showing a conveyance state of a recording medium in a printer equipped with the drying apparatus of the present embodiment. It is. Portions common to those in FIG. 1 are denoted by common reference numerals and description thereof is omitted.

  As shown in FIG. 1, a paper feed cassette (accommodating unit) 3 is disposed on the upper right side of the main body 2 of the printer 1. The paper P is stacked and accommodated inside the paper feed cassette 3. A paper feeding device 4 is disposed above the downstream portion of the paper feeding cassette 3 in the paper conveyance direction. The paper feeding device 4 feeds the paper P toward the upper left of the paper feeding cassette 3 in FIG. A preheating heater (second heating means) 17 is disposed below the paper feed cassette 3. The preheating heater 17 preheats the paper P when the apparatus is activated.

  On the downstream side of the sheet feeding cassette 3 in the sheet conveyance direction, a sheet conveyance path 5, a registration roller 6, a recording unit 7, and a conveyance unit 10 are arranged. The paper P sent out from the paper feed cassette 3 reaches the registration roller 6 through the paper transport path 5. The registration roller 6 corrects the oblique feeding of the paper P and sends the paper P again, and the registration roller 6 feeds the leading edge of the paper P by a paper leading edge detection member (not shown) provided in the paper conveyance path 5 between the recording unit 7 and the registration roller 6. The recording unit 7 performs an ink ejection operation at a timing based on the detection. Note that a pair of transport rollers for transporting the paper P may be provided in the paper transport path 5 as necessary.

  The transport unit 10 includes a print driving roller 12, a print driven roller 13, and an endless print transport belt (third transport unit) 11 wound around a tension roller 14. The printing conveyor belt 11 is rotated counterclockwise in FIG. 1 by a printing driving roller 12. The paper P sent out by the registration roller 6 is placed on the upper surface of the printing transport belt 11 and is transported from the right side to the left side in FIG. Note that a belt in which both ends thereof are overlapped and joined to each other to form an endless shape, a seamless belt (seamless), or the like is preferably used for the printing conveyance belt 11.

  As shown in FIG. 3, a printing air suction fan 59 is provided inside the transport unit 10 at a location facing the recording unit 7. The transport unit 10 can suck air downward from the upper surface by the printing air suction fan 59. The printing conveyor belt 11 is provided with a number of air suction holes (not shown). As a result, the transport unit 10 uses the print transport belt 11 and the print air suction fan 59 to adsorb the paper P to the upper surface of the print transport belt 11 and transports the paper P while in close contact therewith.

  On the other hand, the printer 1 receives image data signals such as characters, graphics, and patterns from an external computer (not shown). The information of the image data is sent to the recording unit 7 disposed above the transport unit 10 so as to face the transport unit 10. The recording unit 7 has a minute gap between the bottom surface of the recording head 8 (see FIG. 3) where the tip of the ink discharge nozzle (not shown) is disposed and the sheet conveying surface which is the upper surface of the printing conveying belt 11 ( For example, 1 mm) is provided.

  The recording unit 7 includes three recording heads 8 corresponding to the respective colors for a total of 12 colors (not shown). Each of the recording heads 8 extends in the sheet width direction perpendicular to the sheet conveyance direction, and, as shown in FIG. 1, from the upstream side to the downstream side in the rotation direction along the rotation direction of the printing conveyance belt 11. They are arranged side by side. The recording heads 8 corresponding to the four colors are a black recording head 8K, a cyan recording head 8C, a magenta recording head 8M, and a yellow recording head 8Y in this order from the upstream side.

  Corresponding to the recording heads 8 of the respective colors, four ink tanks 9 are provided below the transport unit 10. The ink of each color is supplied from the ink tank 9 to the recording head 8 by a supply tube (not shown). In the following description, the identification symbols “K”, “C”, “M”, and “Y” are omitted unless particularly limited.

  As the ink ejection method of the recording head 8, for example, a piezo method that pushes out ink using a piezo element (not shown), a thermal ink jet method that generates air bubbles by a heating element, and ejects ink by applying pressure. Various methods can be applied.

  Each recording head 8 of the recording unit 7 discharges ink from the recording head 8 toward the paper P placed on the surface of the printing conveyance belt 11 in accordance with the image data information received from the external computer. As the printing transport belt 11 rotates, ink of each color is sequentially ejected from each recording head 8 at a predetermined timing, whereby black, cyan, magenta, yellow are printed on the paper P on the surface of the printing transport belt 11. A color ink image in which the four colors of ink are superimposed is formed and printed.

  A heating air blower (heating air blowing means) 18 is provided above the four color recording heads 8. As shown in FIG. 3, the heating air blower 18 includes a heating air blowing fan 19, a heating air blowing heater 20, and four ejection nozzles 21, and the ejection nozzles 21 are in the paper transport direction of each recording head 8. Each is provided on the downstream side. At the time of image recording, the air heated by the heated air blowing heater 20 and sent out by the heated air blowing fan 19 is ejected onto the recording surface of the paper P passing under each ejection nozzle 21 to be discharged onto the paper P. A portion of the applied ink can be dried.

  A drying device 30 is disposed on the downstream side (left side in the drawing) of the transport unit 10 in the paper transport direction. The paper P that has passed through the recording unit 7 is discharged to the drying device 30, and the ink discharged onto the paper P is dried by the drying device 30. Details of the drying device 30 will be described later.

  A transport path 52 is provided substantially horizontally on the bottom surface side of the printer main body 2, and the paper P discharged from the drying device 30 is transported through the transport path 52. The conveyance path 52 is provided with a fixing device 51, a conveyance roller 53, and a discharge roller 55. A discharge tray 56 on which the sheet discharged from the discharge roller 55 is placed is located below the right side of the printer main body 2. Is provided. The paper P discharged from the drying device 30 is first inserted into the fixing device 51.

  As the fixing device 51, one that is usually used in electrophotography can be applied. For example, a heat roller 51a having a halogen heater (not shown) therein and a heat roller 51a are pressed from below to form a nip. The press roller 51b can be configured. The surface temperature of the heat roller 51a rises to, for example, 180 ° C. due to the heating of the halogen heater. Then, when the paper P passes through the fixing device 51, the paper P is heated and pressurized, and the wrinkles of the paper P can be extended.

  The paper P that has passed through the fixing device 51 is transported to the transport roller 53 and moves along the transport path 52 from the left side to the right side of the drawing. A conveyance path 57 for duplex printing branched upward is communicated between the conveyance roller 53 and the discharge roller 55 in the conveyance path 52, and a conveyance path switching plate 54 is provided downstream of the conveyance path 57 for duplex printing. It has been. The conveyance path switching plate 54 can switch between the conveyance path 52 and the conveyance path 57 for double-sided printing between the case where only the front side is printed (single-sided printing) and the case where the back side is printed following the front side (double-sided printing). .

  In the case of single-sided printing, the conveyance path 52 is selected by tilting the conveyance path switching plate 54 substantially horizontally, and the paper P is discharged by a discharge roller 55 to a discharge tray 56 through a discharge port (not shown). In the case of duplex printing, the conveyance path switching plate 54 stands up along the conveyance path 57 for double-sided printing so that the duplex printing conveyance path 57 is selected, and the paper P is conveyed to the registration rollers 6 by the conveyance rollers 58. Then, it is attracted again to the printing transport belt 11 and the back surface is printed in the same manner as the front surface. After the back side is printed and dried by the drying device 30, the paper P is discharged to the discharge tray 56 as described above.

  On the other hand, a lifting device 15 for the transport unit 10 is provided below the transport unit 10. The elevating device 15 attaches a cap (not shown) to the recording head 8 or prevents the ink discharge nozzles (not shown) of each recording head 8 from drying or clogging. The conveyance unit 10 is moved up and down in order to perform the generated jam processing. The lifting device 15 can lower the transport unit 10 by rotating the eccentric cam 16 on the upstream side (right side in the figure) counterclockwise and rotating the eccentric cam 16 on the downstream side (left side in the figure) clockwise. . In addition, the raising / lowering method of the conveyance unit 10 is not limited to the raising / lowering apparatus 15 of this embodiment.

  Then, using the work space formed by the lowering of the transport unit 10, the cap can be moved up and down by a vertical movement mechanism (not shown) and can be attached to and detached from the recording head 8. Further, after the cap is detached, it is horizontally moved by a horizontal movement mechanism (not shown) so that it can be placed at a position where it can be attached to and detached from the recording head 8 and a standby position.

  Regarding the prevention of drying and clogging of the recording head 8, the recording unit 8 starts printing from all the recording heads 8 after the recording unit 7 has been stopped for a long period of time, and the recording head 8 has an ink ejection amount of a predetermined value or less between printing operations. The ink having a high viscosity in the nozzle is ejected from the nozzle to prepare for the next printing operation. At this time, the cap is brought close to the recording head 8 with a minute distance, and the ink is ejected into the cap.

  As shown in FIG. 2, the drying device 30 includes, in order from the top, a first conveyor belt (first conveyor means) 43, a second conveyor belt (second conveyor means) 44, and a third conveyor belt (first conveyor). Means) 45 and the fourth conveyor belt (second conveyor means) 46 are arranged at different positions in the vertical direction.

  For the first to fourth conveyor belts 43 to 46, a belt in which both end portions thereof are overlapped and joined to each other to form an endless shape, a seamless belt (seamless), or the like is preferably used. The first to fourth transport belts 43 to 46 have a transport surface for the paper P in the horizontal direction, and the transport surfaces of the first to third transport belts 43 to 45 have substantially the same length. The conveying surface of the belt 46 is formed longer than these three.

  The first and third transport belts 43 and 45 are respectively provided with first and third drive rollers (first transport means) 33 and 39 disposed on the left side of FIG. 2 and first and third driven rollers disposed on the right side. The second and fourth transport belts 44 and 46 are stretched around the rollers (first transport means) 31 and 37, and the second and fourth drive rollers (second transport means) 34 and 40 disposed on the right side, respectively. And second and fourth driven rollers (second conveying means) 36 and 42 arranged on the left side, and predetermined tension is applied to the first to fourth conveying belts 43 to 46, respectively. ing.

  Inside the first to fourth transport belts 43 to 46, between the first to fourth drive rollers 33, 34, 39, 40 and the first to fourth driven rollers 31, 36, 37, 42, respectively. First air suction fan (first transport means, suction means) 32, second air suction fan (second transport means, suction means) 35, third air suction fan (first transport means, suction means) 38, fourth An air suction fan (second transport means, suction means) 41 is provided.

  The first to fourth transport belts 43 to 46 are provided with a large number of air suction holes (not shown), and the first to fourth air suction fans 32, 35, 38, 41 are used to feed the paper P. The first to fourth conveyor belts 43 to 46 can be conveyed while adsorbing to the upper surfaces of the first to fourth conveyor belts 43 to 46. The first to fourth air suction fans 32, 35, 38, 41, as will be described later, the sheet P naturally falls from the first to third transport belts 43 to 45 and the second to fourth transport belts 44. The suction force is set so as not to prevent the recording surface from dropping downward to .about.46.

  The first conveying belt 43 arranged at the uppermost side has a conveying surface that is substantially horizontal to the conveying surface of the printing conveying belt 11 (see FIGS. 1 and 3), and the first conveying belt 43 of the printer main body 2 (see FIG. 1). The paper P transported by the printing transport belt 11 is transported into the drying device 30 through a long hole (not shown) provided in the right side wall of the drying device 30, and the upper surface of the first transport belt 43 by the first air suction fan 32. Supported by

  Then, the rotation of the first drive roller 33 (in the direction of the arrow in the figure) causes the first conveyance belt 43 to rotate counterclockwise, thereby conveying the paper P conveyed from the recording unit 7 to the left side in FIG. 2 ( First transport direction). On the left side of the first transport belt 43, the paper P is not attracted to the belt by the first air suction fan 32 and naturally falls downward.

  A second conveyor belt 44 is disposed immediately below the first conveyor belt 43 with a predetermined interval H therebetween. The left end portion of the second conveyor belt 44 is disposed on the left side of the left end portion of the first conveyor belt 43 by an interval L (dashed line), and is the first when viewed from the vertical direction (vertical direction in FIG. 2). It has a region that does not overlap with the conveyor belt 43. The interval L is set to be larger than the length of the maximum transportable paper P (the horizontal direction in the figure).

  With this arrangement, the sheet P, which has been transported by the first transport belt 43 directly above and naturally dropped from the left side of the belt, is received by the upper surface of the left end portion of the second transport belt 44 with its recording surface facing upward. 2 Adsorbed by the air suction fan 35 and supported on the upper surface of the belt. The second transport belt 44 is rotated clockwise by the rotation of the second drive roller 34 (in the direction of the arrow in the figure), and transports the dropped paper P from the left side to the right side (second transport direction). . The falling state of the paper P differs depending on the strength of the waist, and for example, the paper P falls while being bent, or it collides with the side wall of the drying device 30 and falls.

  A third conveyor belt 45 is disposed immediately below the second conveyor belt 44 with an interval H therebetween. The right end of the third conveyor belt 45 is disposed on the right side by a distance L (not shown) from the right end of the second conveyor belt 44, and the right end of the third conveyor belt 45 is in the vertical direction. And has a region that does not overlap with the second conveyor belt 44.

  With this arrangement, the sheet P conveyed by the second conveying belt 44 immediately above and dropped to the right side of the belt is received by the upper surface of the right end portion of the third conveying belt 45 with the recording surface thereof facing upward. 3 Adsorbed by the air suction fan 38 and supported on the upper surface of the belt. The third conveying belt 45 is rotated counterclockwise by the rotation of the third driving roller 39 (in the direction of the arrow in the figure), and conveys the dropped paper P from the right side to the left side (first conveying direction). ).

  A fourth conveyor belt 46 is disposed immediately below the third conveyor belt 45 with an interval H therebetween. The left end of the fourth conveyor belt 46 is disposed on the left side of the left end of the third conveyor belt 45 by a distance L, and the left end of the fourth conveyor belt 46 is third when viewed from the vertical direction. It has a region that does not overlap the conveyor belt 45.

  Further, the right end portion of the fourth conveyor belt 46 is disposed at substantially the same position as the right end portion of the third conveyor belt 45 when viewed from the vertical direction, and the conveyance surface of the paper P of the fourth conveyor belt 46 is a fixing device. 51 (see FIG. 1 and FIG. 3) is arranged so as to be substantially horizontal. Note that the fourth driving roller 40 forms a roller pair with the roller 40a provided above, and the conveyance of the paper P is stabilized.

  With the above arrangement, the sheet P conveyed by the third conveying belt 45 immediately above and dropped to the left side of the belt is received by the upper surface of the left end portion of the fourth conveying belt 46 with the recording surface facing upward, It can be adsorbed by the fourth air suction fan 41 and supported on the upper surface of the belt. The fourth conveyor belt 46 is rotated clockwise by the rotation of the fourth drive roller 40 (in the direction of the arrow in the drawing), and conveys the dropped paper P from the left side to the right side (second conveyance direction). .

  Then, the sheet P conveyed to the right side by the fourth conveying belt 46 is conveyed into the printer main body 2 (see FIG. 1) through a long hole (not shown) provided in the right side wall of the drying device 30, and the nip of the fixing device 51. Is inserted.

  On the other hand, a heater (first drying means) 47 is disposed in the horizontal direction above the uppermost first conveyor belt 43 in the drying device 30, and a blower fan (blower means) is provided above the heater 47. Three 48 are arranged. The heater 47 is provided with a plurality of small holes (not shown), and the air flow sent from the blower fan 48 is heated by the heater 47 and passes through the small holes to become hot air or hot air. It is sent into the drying device 30. Thereby, drying of the ink discharged on the paper P conveyed by the 1st-4th conveyance belts 43-46 can be accelerated | stimulated.

  Next, the printing and drying operations of the paper P will be described based on FIG. 3 with reference to FIG. First, the paper P accommodated in the paper feed cassette 3 and preheated by the preheating heater 17 is sent out to the paper transport path 5 by the paper feed device 4 (see FIG. 1), and at a predetermined timing by the registration roller 6. It is sent out to the conveyance belt 11 for printing (see FIG. 1).

  Subsequently, the paper P is transported to the recording unit 7 (see FIG. 1) by the printing transport belt 11 and predetermined ink is ejected onto the paper P by the recording head 8 and part of the ink ejected by the heating air blower 18. Is dried. The paper P that has passed through the recording unit 7 is transported to the drying device 30 by the printing transport belt 11, and is supported by the first transport belt 43 in the drying device 30.

  An air flow heated by a heater 47 and a blower fan 48 disposed above is sent inside the drying device 30. When the paper P is first transported to the left by the first transport belt 43 in contact with the air flow, it naturally falls to the left end of the second transport belt 44. Next, when the sheet is transported to the right side by the second transport belt 44, it naturally falls to the right end of the third transport belt 45.

  Further, when the paper is transported to the left by the third transport belt 45, it naturally falls to the left end of the fourth transport belt 46. Then, it is conveyed to the right side by the fourth conveyor belt 46, discharged from the drying device 30, and inserted into the fixing device 51 of the printer main body 2 (see FIG. 1). In this way, the ink ejected onto the paper P can be dried by being transported by the first to fourth transport belts 43 to 46 in the drying device 30. At this time, since the ink is sufficiently dried up to the fourth drive roller 40, even if the recording surface of the paper P comes into contact with the roller 40a, a problem due to non-drying is unlikely to occur.

  Then, the wrinkles of the paper P generated by the ink adhesion and drying are stretched by passing through the nip of the fixing device 51. The paper P that has passed through the fixing device 51 is transported to the right by the transport roller 53, and is discharged to the discharge tray 56 by the discharge roller 55 in the case of single-sided printing. On the other hand, in the case of duplex printing, the transport path is switched upward by the transport path switching plate 54, transported to the registration roller 6 (see FIG. 1) by the transport roller 58, and then sent out again to the recording unit 7. Ink is discharged. Then, after drying by the drying device 30, it is discharged to the discharge roller 56 as described above.

  As described above, in the drying device 30 that dries the ink ejected on the paper P, the first to fourth transport belts 43 to 46 and the first to fourth drive rollers 33 that transport the paper P to the opposite sides in the horizontal direction. , 34, 39, 40, first to fourth driven rollers 31, 36, 37, 42, first to fourth air suction fans 32, 35, 38, 41 are arranged in the vertical direction at intervals H, 2. The left ends of the fourth conveyor belts 44 and 46 are arranged on the left side of the first and third conveyor belts 43 and 45 positioned immediately above, respectively, and the right end of the third conveyor belt 45 is directly above. Since the sheet P is disposed on the right side of the second conveying belt 44 positioned, the sheet P can be moved from the upper side to the lower side while sequentially changing the conveying direction to the opposite side in the horizontal direction.

  Thereby, the transport distance of the paper P on which ink is ejected can be increased in a small space, and the drying time of the paper P can be extended. Therefore, power required for drying can be suppressed. Further, it is possible to avoid the enlargement of the apparatus and to sufficiently dry the ink ejected onto the paper P. Furthermore, it is possible to cope with high-speed printing. In addition, since the ink on the paper P is sufficiently dry, even when the fixing device 51 is passed through in order to stretch the wrinkles of the paper P, it is possible to prevent problems such as turbulence of the printed image due to non-drying. .

  Further, in the present embodiment, by setting the interval L to be longer than the length in the conveyance direction of the largest sheet P that can be conveyed, the sheet P is moved to the first, fourth, and fourth conveyance belts 43 to 46. Even if it falls from the left end of the third conveyor belts 43 and 45 and the right end of the second conveyor belt 44, the left ends of the second and fourth conveyor belts 44 and 46 and the third conveyor belt 45 The paper P can be easily supported at the right end.

  Thereby, the paper P can be easily moved downward. In addition, the recording surface of the paper P can be further prevented from coming into contact with the first to fourth transport belts 43 to 46 and peripheral members. Accordingly, it is possible to easily dry the ink on the paper P and to prevent the quality of the printed image from being deteriorated.

  However, the interval L is not particularly limited to the present embodiment, and can be set as appropriate according to the characteristics of the paper P such as the apparatus configuration and waist strength. Further, a member for assisting the downward movement of the paper P between the first to fourth transport belts 43 to 46 can be appropriately provided, and the interval L is appropriately set according to the configuration of the member. You can also.

  Also, the vertical interval H is not particularly limited to this embodiment. If the interval H is small, the conveyance of the paper P may be difficult, or the recording surface of the paper P may come into contact with the first to third conveyance belts 43 to 45 immediately above. If the interval H is large, the paper P may fall. There is also a risk that the recording surface may be affected. Therefore, for example, the interval H may be set appropriately in consideration of these.

  In the present embodiment, since the blower fan 48 that brings the air flow into contact with the paper P is provided, the ink on the paper P can be efficiently dried. Further, since the heater 47 for heating the paper P is provided, the paper P can be efficiently dried. Here, since the blower fan 48 and the heater 47 are provided together, the ink on the paper P can be dried more efficiently.

  In the present embodiment, the first to fourth transport belts 43 to 46, the first to fourth drive rollers 33, 34, 39, and 40 around which the belt is bridged, the first to fourth driven rollers 31, Since the paper P is transported by the 36, 37, 42 and the first to fourth air suction fans 32, 35, 38, 41, the paper P can be transported with a simple configuration. However, the method of transporting the paper P is particularly limited to the present embodiment as long as the paper P can be alternately arranged in parallel in the vertical direction at a predetermined interval and the paper P can be sequentially moved from the upper side to the lower side in the opposite direction. is not.

  Further, in the present embodiment, the preheating heater 17 that heats the paper P stored in the paper feed cassette 3 and the paper P near the recording head 8 on the downstream side in the transport direction of the paper P by the printing transport belt 11. On the other hand, the heating air blower 18 that heats and blows air is provided, so that the preheating of the paper P by the preheating heater 17 can promote the evaporation of the ejected ink, which will be described later. Part of the ink ejected to P can be dried.

  Therefore, the burden on drying of the drying device 30 can be reduced and the drying of the paper P can be promoted, so that the paper P can be efficiently dried. In particular, in this embodiment, since the preheating heater 17 and the heating air blower 18 are arranged in parallel, it is more efficient.

  Moreover, in this embodiment, although the 1st-4th conveyance belts 43-46 were arrange | positioned in the substantially horizontal direction, these arrangement | positioning directions are not specifically limited, For example, it is 1st-4th conveyance, for example. The belts 43 to 46 can also be arranged obliquely. However, if it is arranged obliquely, the horizontal space can be reduced, but the position of the uppermost first conveyor belt 43 is increased, and the vertical space may be increased. In addition, if the conveying surface of the printing conveying belt 11 is increased, the vertical space of the printer body 2 may be increased. Therefore, for example, the arrangement of the first to fourth conveyor belts 43 to 46 may be appropriately set in consideration of these.

  In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the number of nozzles and the nozzle interval of the recording heads 8K to 8Y can be appropriately set according to the specifications of the apparatus. In the present embodiment, the heater 47 and the blower fan 48 are arranged above the drying device 30. However, such arrangement is not particularly limited, and other arrangements such as the left and right side surfaces and the lower side are provided according to the device configuration. You can also

  In the present embodiment, the drying device 30 is exemplified as having four conveyor belts, the first to fourth conveyor belts 43 to 46, but the number of conveyor belts is the printing speed, the size of the paper P, the ink It can be set as appropriate according to the type, the discharge amount, etc., the size of the apparatus main body, etc., and is not particularly limited. In addition, for example, only two of the uppermost first conveyor belt 43 and the second conveyor belt 44 may be provided, or five or more may be provided. In the present embodiment, the ink jet printer 1 is used. However, the present invention can also be used as a drying device for an image forming apparatus other than the ink jet printer 1.

  The present invention is a drying apparatus that dries ink ejected onto a recording medium, and includes a first conveying unit that conveys the recording medium in a first conveying direction, and a second that is opposite to the first conveying direction. One or more second conveying means for conveying in the conveying direction are arranged alternately at predetermined intervals in the vertical direction, and the upstream end in the conveying direction of the second conveying means is located immediately above The downstream end of the first transport unit is disposed downstream of the first transport direction, and the upstream end of the first transport unit in the transport direction is located immediately above the second transport unit. It is arranged on the downstream side in the second transport direction from the downstream end in the transport direction.

  As a result, the transport distance of the recording medium on which ink is ejected can be increased in a small space, and the drying time of the recording medium can be extended. Therefore, power required for drying can be suppressed. Further, it is possible to avoid the enlargement of the apparatus and to sufficiently dry the ink ejected onto the recording medium. Furthermore, it is possible to cope with high-speed printing.

  Further, the distance between the upstream end of the second transport means and the downstream end of the first transport means, and the upstream end of the first transport means and the downstream end of the second transport means Is larger than the length of the recording medium in the conveyance direction, so that the recording medium dropped from the downstream end of the first conveyance means and the second conveyance means can be separated from the upstream side of the second and first conveyance means, respectively. Since it becomes easy to support at the end, the recording medium can be easily moved downward, the ink on the paper P can be easily dried, and the quality of the printed image can be prevented from being lowered.

  In addition, by providing a blowing means for bringing the air flow into contact with the recording medium, the ink on the recording medium can be efficiently dried. By providing the first heating means for heating the recording medium, the recording can be performed efficiently. The medium can be dried. Further, the first and second conveying means include: an endless conveying belt that conveys the recording medium; a driving roller and a driven roller that span the conveying belt; and an adsorption means that adsorbs the recording medium to the conveying belt. By configuring, the recording medium can be transported with a simple configuration.

  Further, the drying device, a recording medium container, a recording head that ejects ink onto the recording medium, and a third conveying unit that conveys the recording medium contained in the container to the recording head and the drying device. The recording medium can be sufficiently dried by providing an ink jet recording apparatus in which the ink ejected onto the recording medium by the recording head is dried by the drying apparatus.

  A second heating unit that heats the recording medium stored in the storage unit; and a heating air blowing unit that heats and blows air to the recording medium immediately downstream of the third conveying unit in the recording medium conveyance direction with respect to the recording head. By providing the recording medium, the recording medium can be efficiently dried.

FIG. 2 is a schematic front sectional view showing a schematic structure of an ink jet printer which is an example of an ink jet recording apparatus. These are model front sectional drawings which show schematic structure of the drying apparatus of this embodiment. These are schematic sectional drawing which shows the conveyance state of the recording medium in the printer provided with the drying apparatus of this embodiment.

Explanation of symbols

1 Printer (inkjet recording device)
2 Main body 7 Recording section 8 Recording head 11 Conveying belt (third conveying means)
17 Preheating heater (second heating means)
18 Heating blower (heating blower)
30 Drying device 31, 37 First and third driven rollers (first conveying means)
36, 42 Second and fourth driven rollers (second conveying means)
32, 38 First and third air suction fans (first transport means)
35, 41 Second and fourth air suction fans (second conveying means)
33, 39 First and third driving rollers (first conveying means)
34, 40 Second and fourth driving rollers (second conveying means)
43, 45 First and third conveyor belts (first conveyor means)
44, 46 Second and fourth conveyor belts (second conveyor means)
47 Heater (first heating means)
48 Blower fan (Blower unit)
P paper

Claims (5)

A drying device for drying ink ejected on a recording medium,
First heating means;
Air blowing means;
One or more first transport means for transporting the recording medium in the first transport direction;
One or more second transport means for transporting in a second transport direction opposite to the first transport direction;
With
Said first conveying means and said second conveying means are placed alternately at a predetermined distance in a vertical direction,
The first conveying means is arranged on the top level, the second conveying means is arranged on the second level from the top,
The upstream end portion in the transport direction of the second transport means is disposed on the downstream side in the first transport direction with respect to the downstream end portion in the transport direction of the first transport means located immediately above.
The upstream end in the transport direction of the first transport means has the second transport direction in comparison with the downstream end in the transport direction of the second transport means located immediately above when the second transport means is located directly above. Placed downstream ,
The first heating means and the air blowing means are disposed only at positions above the first conveying means and the second conveying means,
The blowing means is disposed above the first heating means and blows downward,
The first heating unit includes the first transport unit disposed at the uppermost stage among a part of the first transport unit disposed at the uppermost stage and the second transport unit disposed at the second stage from the top. A drying apparatus characterized by being arranged so as to cover both of a part of a portion not covered with the means .   The distance between the upstream end of the second transport means and the downstream end of the first transport means, and the upstream end of the first transport means and the downstream end of the second transport means The drying apparatus according to claim 1, wherein the interval between the first and second sections is greater than the length in the transport direction of the maximum transportable recording medium. The first and second conveying means include an endless conveying belt that conveys the recording medium, a driving roller and a driven roller that span the conveying belt, and an adsorption means that adsorbs the recording medium to the conveying belt. The drying apparatus according to claim 1 , wherein the drying apparatus is configured. The drying device according to any one of claims 1 to 3 , a storage unit for a recording medium, a recording head for ejecting ink onto the recording medium, and the recording medium stored in the storage unit for the recording head and the drying unit An ink jet recording apparatus comprising: a third transport unit that transports the ink to the apparatus; and the ink ejected onto the recording medium by the recording head is dried by the drying apparatus. A second heating unit that heats the recording medium stored in the storage unit; and a heating air blowing unit that heats and blows air to the recording medium immediately downstream of the third transport unit in the recording medium transport direction with respect to the recording head; The inkjet recording apparatus according to claim 4 , wherein the inkjet recording apparatus is provided.

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