JP2017052098A - Ink jet printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet molding method which can quickly execute two-sided printing with high accuracy.SOLUTION: An ink jet printer includes: a conveyance mechanism 20 which conveys a recording medium 90; and an ink jet head 43 and ink jet head 53 whose discharge direction of ink from a nozzle is downward in the vertical direction indicated by an arrow 10a. The ink jet head 43 performs printing on the surface of the recording medium 90 whose surface is the upper surface in the vertical direction indicated by the arrow 10a. The conveyance mechanism 20 includes a direction change member 27 and direction change member 29 which change the front and rear surfaces of the recording medium 90 so that the rear surface of the recording medium 90 whose surface has been printed by the ink jet head 43 becomes the upper surface in the vertical direction indicated by the arrow 10a. The ink jet head 53 performs printing on the rear surface of the recording medium 90 whose rear surface is made to be the upper surface in the vertical direction indicated by the arrow 10a by the direction change member 27 and direction change member 29.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an inkjet printer capable of duplex printing.

  2. Description of the Related Art Conventionally, as an inkjet printer capable of duplex printing, a printer including a transport mechanism that transports a recording medium in a vertical direction, and a first inkjet head and a second inkjet head in which the ink discharge direction is a horizontal direction is known. (For example, refer to Patent Document 1). In the ink jet printer described in Patent Document 1, a recording medium is transported by a transport mechanism, and printing is performed on the front surface of the recording medium with a first ink jet head, and printing is performed on the back surface of the recording medium with a second ink jet head. In the ink jet printer described in Patent Document 1, the first ink jet head and the second ink jet head move in a direction perpendicular to the recording medium conveyance direction and parallel to the recording medium, and nozzles for discharging ink are provided. Assuming that the first inkjet head and the second inkjet head include a plurality of nozzle rows arranged in the recording medium conveyance direction, the longer the nozzle row length in the recording medium conveyance direction, the higher the printing speed. .

JP 2006-256289 A

  However, in the inkjet printer described in Patent Document 1, when the length of the nozzle row in the recording medium conveyance direction, that is, the vertical direction is increased, the uppermost nozzle and the lowermost nozzle among the nozzles in the nozzle row As a result, there is a large difference in ink discharge performance between the upper end nozzle and the lower end nozzle, resulting in a problem that printing accuracy is lowered.

  SUMMARY An advantage of some aspects of the invention is that it provides an ink jet printer capable of executing high-precision double-sided printing at high speed.

  An ink jet printer according to the present invention includes a transport mechanism that transports a recording medium, and a first ink jet head and a second ink jet head in which a discharge direction of ink from a nozzle is downward in the vertical direction, and the first ink jet printer The head performs printing on the surface of the recording medium whose surface is the upper surface in the vertical direction, and the transport mechanism is configured such that the back surface of the recording medium printed on the surface by the first inkjet head is the upper surface in the vertical direction. The second ink-jet head performs printing on the back surface of the recording medium, the back surface of which is the top surface in the vertical direction by the front and back surface change mechanism. It is characterized by.

  With this configuration, in the ink jet printer of the present invention, both the first ink jet head and the second ink jet head have a nozzle group in the conveyance direction of the recording medium because the ink ejection direction from the nozzle is downward in the vertical direction. Even if the length is increased, the ink head difference in the nozzles at both ends of the nozzle group in the conveyance direction of the recording medium is suppressed, and the printing accuracy remains high. Therefore, the ink jet printer of the present invention can execute high-precision double-sided printing at high speed by increasing the length of the nozzle group in the recording medium conveyance direction.

  In the inkjet printer according to the aspect of the invention, the transport mechanism is for duplex printing in which the wound recording medium is fed out to the first inkjet head side for duplex printing by the first inkjet head and the second inkjet head. You may provide the feeding roller and the winding roller for double-sided printing which winds up the said recording medium double-sided printed by the said 1st inkjet head and the said 2nd inkjet head from the said 2nd inkjet head side.

  With this configuration, the ink jet printer of the present invention is continuously double-sided on a long recording medium such as a cloth or a polyvinyl chloride sheet that is fed by a double-sided printing roll and wound by a double-sided printing roll. Printing can be performed.

  In the inkjet printer of the present invention, the transport mechanism includes a first single-sided printing feed roller that feeds the wound recording medium to the first inkjet head side for single-sided printing by the first inkjet head; A first single-sided printing take-up roller that winds the recording medium that has been printed on one side by the first inkjet head from the first inkjet head side, and the wound recording medium by the second inkjet head. A second single-sided printing feed roller that feeds out to the second inkjet head side for single-sided printing and a recording medium that has been printed on one side by the second inkjet head are wound up from the second inkjet head side. Two single-sided printing take-up rollers, One of the one-side printing feeding roller and the first one-side printing winding roller is the two-sided printing feeding roller, and the second one-side printing feeding roller and the second one-side printing winding roller. One of the two may be the double-sided printing take-up roller.

  With this configuration, the ink jet printer of the present invention can perform double-sided printing with the first ink jet head and the second ink jet head, and can perform single side printing with the first ink jet head and the second ink jet head, respectively. It is feasible. Moreover, since the ink jet printer of the present invention can simultaneously execute single-sided printing by the first ink jet head and the second ink jet head, respectively, it is possible to produce a large amount of printed matter by single-sided printing in a short time.

  In the ink jet printer according to the aspect of the invention, the front and back changing mechanism may include the first ink jet head, the first single-sided printing feed roller, and the first single-sided printing take-up roller other than the double-sided printing feed roller. It may be arranged between the two.

  With this configuration, the inkjet printer of the present invention can print on the back surface of the recording medium with the second inkjet head without winding the recording medium printed on the surface with the first inkjet head with the winding roller. Therefore, it is possible to execute double-sided printing with a simple configuration.

  In the ink jet printer of the present invention, the front / back changing mechanism may change the conveyance direction of the recording medium in the opposite direction.

  With this configuration, the inkjet printer of the present invention can be reduced in size while suppressing the overall size in the horizontal direction.

  The inkjet printer of the present invention can perform high-precision double-sided printing at high speed.

It is the schematic block diagram which observed the inkjet printer which concerns on one embodiment of this invention from the side surface at the time of double-sided printing. It is the schematic block diagram which observed the inkjet printer shown in FIG. 1 from the upper surface side at the time of double-sided printing. FIG. 2 is a bottom view of a rail, a carriage, and an inkjet head shown in FIG. 1. It is a block diagram of the inkjet printer shown in FIG. It is the schematic block diagram which observed the inkjet printer shown in FIG. 1 from the side surface side at the time of single-sided printing. FIG. 4 is a bottom view of a rail, a carriage, and an ink jet head of an ink jet printer according to an embodiment of the present invention in an example different from the example shown in FIG. 3. In the example different from the example shown in FIG. 2, it is the schematic block diagram which observed the inkjet printer which concerns on one embodiment of this invention from the upper surface side at the time of double-sided printing. In the example different from the example shown in FIG. 5, it is the schematic block diagram which observed the inkjet printer which concerns on one embodiment of this invention from the side surface side at the time of single-sided printing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the configuration of the ink jet printer according to the embodiment of the present invention will be described.

  FIG. 1 is a schematic configuration diagram of an inkjet printer 10 according to the present embodiment observed from the side surface during double-side printing. FIG. 2 is a schematic configuration diagram of the inkjet printer 10 observed from the upper surface side during duplex printing.

  As shown in FIGS. 1 and 2, the inkjet printer 10 extends in the main scanning direction indicated by the conveyance mechanism 20 for conveying the recording medium 90 and the gravity direction indicated by the arrow 10a, that is, the arrow 10b orthogonal to the vertical direction. Rail 41, a carriage 42 supported by the rail 41 so as to be movable in the main scanning direction indicated by an arrow 10b, a plurality of inkjet heads 43 as first inkjet heads mounted on the carriage 42, and a recording medium Heaters 44 to 46 for applying heat to the recording medium 90 to harden or develop the color adhered to the ink 90, the rail 51 extending in the main scanning direction indicated by the arrow 10b, and the main scanning direction indicated by the arrow 10b. A carriage 52 movably supported by the rail 51 and a second ink cartridge mounted on the carriage 52. A plurality of inkjet heads 53 serving as the print heads, heaters 54 to 56 that apply heat to the recording medium 90 to harden or develop the color of ink attached to the recording medium 90, and the printing position on the surface of the recording medium 90 during duplex printing. A print position sensor 61 for detecting the print position, and a print position sensor 62 for detecting the print position of both sides of the recording medium 90 during duplex printing.

  Since the print position sensor 62 detects the print positions on both sides of the recording medium 90, the print position sensor 62 is preferably disposed on both the upper and lower sides in the vertical direction indicated by the arrow 10a with the recording medium 90 in between. If the transparency of 90 is high and not only the printing position from one side to the other side but also the recording position of the recording medium 90 can be transmitted and the printing position of the opposite side can be detected, it may be arranged only on one side.

  The conveyance mechanism 20 extends in the direction indicated by the arrow 10b and the rollers 21 to 24 around which the recording medium 90 is wound, and the conveyance direction of the portion of the recording medium 90 that faces the inkjet head 43 is indicated by the direction indicated by the arrow 10a. The platen 25 that is in the direction indicated by the arrow 10c that is orthogonal to both the directions indicated by the arrow 10b, the platen 26 that sets the conveyance direction of the portion of the recording medium 90 facing the inkjet head 53 to the direction indicated by the arrow 10c, and the arrow 10b Direction changing members 27 to 29 that change the conveyance direction of the recording medium 90, and pinch rollers 30 to 32 that extend in the direction indicated by the arrow 10 b and feed the recording medium 90. ing.

  The platen 25 is disposed above the platen 26 in the vertical direction indicated by the arrow 10a.

  The direction changing member 27 and the direction changing member 29 constitute a front / back changing mechanism for changing the front / back of the recording medium 90.

  The inkjet head 43 is disposed between the roller 21 and the roller 22 in the conveyance path of the recording medium 90 during single-sided printing, which will be described later. The pinch roller 30 and the heater 44 are disposed between the roller 21 and the inkjet head 43 in the conveyance path of the recording medium 90. The heater 45 is disposed below the inkjet head 43 in the vertical direction indicated by the arrow 10a. The direction changing member 27, the heater 46, and the print position sensor 61 are disposed between the roller 22 and the inkjet head 43 in the conveyance path of the recording medium 90 during single-sided printing described later.

  The inkjet head 53 is disposed between the roller 23 and the roller 24 in the conveyance path of the recording medium 90 during single-sided printing described later. The pinch roller 31, the heater 54, and the print position sensor 62 are disposed between the roller 23 and the inkjet head 53 in the conveyance path of the recording medium 90. The heater 55 is disposed below the inkjet head 53 in the vertical direction indicated by the arrow 10a. The direction changing member 28, the direction changing member 29, the pinch roller 32, and the heater 56 are disposed between the roller 24 and the inkjet head 53 in the conveyance path of the recording medium 90 during single-side printing described later.

  FIG. 3 is a bottom view of the rail 41, the carriage 42, and the inkjet head 43.

  As shown in FIG. 3, in the inkjet head 43, a plurality of nozzles 43 a that eject ink are arranged in the transport direction indicated by the arrow 10 c of the recording medium 90 (see FIG. 1) by the transport mechanism 20 (see FIG. 1). A nozzle row 43b is provided. In the inkjet head 43, the ink ejection direction from the nozzle 43a is downward in the vertical direction indicated by the arrow 10a (see FIG. 1).

  Similarly, the inkjet head 53 (see FIG. 1) includes a nozzle row in which a plurality of nozzles that eject ink are arranged in the conveyance direction indicated by the arrow 10c of the recording medium 90 by the conveyance mechanism 20. In the inkjet head 53, the ejection direction of the ink from the nozzles is downward in the vertical direction indicated by the arrow 10a.

  FIG. 4 is a block diagram of the ink jet printer 10.

  As shown in FIG. 4, the inkjet printer 10 has various operations such as a carriage driving device 71 that moves the carriage 42 in the direction indicated by the arrow 10b, and a carriage driving device 72 that moves the carriage 52 in the direction indicated by the arrow 10b. An operation unit 73 that is an input device such as an input button, a display unit 74 that is a display device such as an LCD (Liquid Crystal Display) that displays various information, and a communication that is a communication device that communicates with an external device. A storage unit 76 that is a storage device such as an HDD (Hard Disk Drive) that stores various data, and a control unit 77 that controls the entire inkjet printer 10.

  The control unit 77 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory) that stores programs and various data in advance, and a RAM (Random Access Memory) used as a work area of the CPU. ing. The CPU is configured to execute a program stored in the ROM or the storage unit 76.

  Next, the operation of the inkjet printer 10 will be described.

  First, the operation of the inkjet printer 10 during double-sided printing will be described.

  At the time of duplex printing, as shown in FIGS. 1 and 2, a recording medium 90 is disposed between the roller 21 and the roller 23. Here, since the direction changing member 28 is not used at the time of double-sided printing, it is brought into contact with the recording medium 90 by being moved downward in the vertical direction indicated by the arrow 10a. Further, since the pinch roller 31 is not used at the time of double-sided printing, it is not in contact with the recording medium 90 by being moved upward in the vertical direction indicated by the arrow 10a.

  When the control unit 77 receives print data for double-sided printing via the communication unit 75, the control unit 77 operates as follows based on the received print data.

  The control unit 77 sends the recording medium 90 to the direction indicated by the arrow 10d by the pinch roller 30, that is, the inkjet head 43 side. Therefore, the recording medium 90 wound around the roller 21 is fed to the inkjet head 43 side for double-sided printing by the inkjet head 43 and the inkjet head 53. That is, the roller 21 functions as a feeding roller for double-sided printing.

  In addition, the control unit 77 causes the recording medium 90 printed on the front surface by the ink jet head 43 to be printed on the back surface by the ink jet head 53 in the direction indicated by the arrow 10d by the pinch roller 32, that is, in the ink jet head 53 side. send. Then, the control unit 77 winds the recording medium 90 printed on both sides by the inkjet head 43 and the inkjet head 53 by the roller 23 from the inkjet head 53 side. That is, the roller 23 functions as a winding roller for double-sided printing.

  Note that the surface of the recording medium 90 that faces the inkjet head 43 is the upper surface in the vertical direction indicated by the arrow 10a. However, the front and back surfaces of the recording medium 90 are changed so that the back surface becomes the upper surface in the vertical direction indicated by the arrow 10 a by the contact with the direction changing member 27 and the direction changing member 29 by the conveyance by the conveyance mechanism 20. Therefore, the recording medium 90 has a back surface on the vertical direction indicated by the arrow 10a in a portion facing the inkjet head 53.

  The control unit 77 performs printing on the front surface of the recording medium 90 by the inkjet head 43 and the carriage driving device 71 during duplex printing, and also performs printing on the back surface of the recording medium 90 by the inkjet head 53 and the carriage driving device 72. The control unit 77 drives the heaters 44 to 46, the heater 54, and the heater 55 during double-sided printing. Therefore, after the recording medium 90 is heated by the heater 44, printing is performed on the surface by the inkjet head 43 while being heated by the heater 45, and then the recording medium 90 is heated by the heater 46 and then heated by the heater 55 while being heated by the heater 55. Printing on the back surface is performed by 53 and then heated by the heater 54.

  The control unit 77 detects the position and length of the image printed on the surface of the recording medium 90 by the inkjet head 43 during duplex printing, and then prints on the back surface of the recording medium 90 by the inkjet head 53. The position and length of the scheduled image are changed according to the detection result by the print position sensor 61 so as to match the position and length of the image printed on the surface of the recording medium 90 by the inkjet head 43. Then, the control unit 77 detects the position and length of the image printed on both sides of the recording medium 90 by the printing position sensor 62, and the detection result by the printing position sensor 62 is transferred to the back surface of the recording medium 90 by the inkjet head 53. Give feedback on printing. Therefore, the inkjet printer 10 is a case where the recording medium 90 is expanded or contracted between the time when printing is performed on the front surface of the recording medium 90 by the inkjet head 43 and the time when printing is performed on the rear surface of the recording medium 90 by the inkjet head 53. However, the image printed on the back surface of the recording medium 90 can be corrected to match the image printed on the front surface of the recording medium 90.

  Next, the operation of the inkjet printer 10 during single-sided printing will be described.

  During single-sided printing, as shown in FIG. 5, the recording medium 90 can be disposed between the roller 21 and the roller 22, and the recording medium 90 is also disposed between the roller 23 and the roller 24. Can. Here, since the direction changing member 29 and the pinch roller 32 are not used at the time of single-sided printing, they are not in contact with the recording medium 90 by being moved upward in the vertical direction indicated by the arrow 10a. On the other hand, since the direction changing member 28 is used during single-sided printing, it is brought into contact with the recording medium 90 by being moved upward in the vertical direction indicated by the arrow 10a from double-sided printing shown in FIG. . Further, since the pinch roller 31 is also used during single-sided printing, it is brought into contact with the recording medium 90 by being moved downward in the vertical direction indicated by the arrow 10a than during double-sided printing shown in FIG. .

  When the control unit 77 receives print data for single-sided printing via the communication unit 75, the control unit 77 operates as follows based on the received print data.

  The control unit 77 sends the recording medium 90 to the direction indicated by the arrow 10e by the pinch roller 30, that is, the inkjet head 43 side. Therefore, the recording medium 90 wound around the roller 21 is fed to the inkjet head 43 side for single-sided printing by the inkjet head 43. That is, the roller 21 functions as a first single-sided printing feed roller. And the control part 77 winds up the recording medium 90 printed on one side by the inkjet head 43 with the roller 22 from the inkjet head 43 side. That is, the roller 22 functions as a first single-sided winding roller.

  In addition, the control unit 77 sends the recording medium 90 to the direction indicated by the arrow 10 f by the pinch roller 31, that is, to the inkjet head 53 side. Accordingly, the recording medium 90 wound around the roller 23 is fed out to the inkjet head 53 side for single-sided printing by the inkjet head 53. That is, the roller 23 functions as a second single-sided printing feed roller. Then, the control unit 77 winds the recording medium 90 printed on one side by the inkjet head 53 by the roller 24 from the inkjet head 53 side. That is, the roller 24 functions as a second single-sided printing take-up roller.

  The control unit 77 performs printing on the surface of the recording medium 90 by the inkjet head 43 and the carriage driving device 71 and performs heating on the surface of the recording medium 90 when the single-sided printing is performed on the recording medium 90 disposed between the roller 21 and the roller 22. Drive ~ 46. Therefore, after the recording medium 90 disposed between the roller 21 and the roller 22 is heated by the heater 44, printing is performed on the surface by the inkjet head 43 while being heated by the heater 45, and then the heater 46 Heated.

  The control unit 77 performs printing on the surface of the recording medium 90 by the inkjet head 53 and the carriage driving device 72 during single-sided printing on the recording medium 90 disposed between the roller 23 and the roller 24, and The heaters 54 to 56 are driven. Therefore, after the recording medium 90 disposed between the roller 23 and the roller 24 is heated by the heater 54, printing is performed on the surface by the inkjet head 53 while being heated by the heater 55, and then the heater 56 Heated.

  As described above, in the inkjet printer 10, since the ejection direction of the ink from the nozzles 43 a of the inkjet head 43 is downward in the vertical direction indicated by the arrow 10 a, the length of the nozzles 43 a group in the conveyance direction of the recording medium 90. Even when the recording medium 90 is lengthened, the ink head difference between the nozzles 43a at both ends of the nozzle 43a group in the conveyance direction of the recording medium 90 is suppressed, and the printing accuracy is maintained with high accuracy. Similarly, in the inkjet printer 10, since the ejection direction of ink from the nozzles of the inkjet head 53 is downward in the vertical direction indicated by the arrow 10a, the length of the nozzle group of the inkjet head 53 in the conveyance direction of the recording medium 90 is increased. Even in this case, the ink head difference at the nozzles at both ends of the nozzle group of the inkjet head 53 in the conveyance direction of the recording medium 90 is suppressed, and the printing accuracy is maintained with high accuracy. Therefore, the inkjet printer 10 increases the length of the nozzle 43a group of the inkjet head 43 in the conveyance direction of the recording medium 90 and increases the length of the nozzle group of the inkjet head 53 in the conveyance direction of the recording medium 90. High-precision double-sided printing can be executed at high speed.

  As a method of increasing the length of the nozzle 43a group of the inkjet head 43 in the conveyance direction of the recording medium 90, a method of increasing the length of the nozzle row 43b as shown in FIG. 3 and a method as shown in FIG. By arranging the plurality of inkjet heads 43 to be shifted in the conveyance direction of the recording medium 90, that is, in the direction indicated by the arrow 10c, the plurality of inkjet heads 43 constitute a stagger head as a whole, and the nozzles 43a in the direction indicated by the arrow 10c There is a way to increase the length.

  Since the inkjet printer 10 includes the roller 21 and the roller 23, the double-sided printing is continuously performed on a long recording medium 90 such as a cloth or a polyvinyl chloride sheet that is drawn out by the roller 21 and wound up by the roller 23. Can be executed.

  As shown in FIG. 1, the inkjet printer 10 can execute not only double-sided printing with the inkjet head 43 and the inkjet head 53 but also single-sided printing with the inkjet head 43 and the inkjet head 53 as shown in FIG. It is. Moreover, since the inkjet printer 10 can simultaneously perform single-sided printing by the inkjet head 43 and the inkjet head 53, respectively, it is possible to produce a large amount of printed matter by a single-sided printing in a short time. Note that when the inkjet printer 10 and the inkjet head 53 simultaneously perform single-sided printing, the inkjet printer 10 may generate the same type of printed matter by the inkjet head 43 and the inkjet head 53, or different from each other. Different types of printed matter may be generated.

  In the inkjet printer 10, the direction changing member 27 is disposed between the roller 21 and the roller 22 other than the double-sided printing feed roller and the inkjet head 43. The printed recording medium 90 can be printed on the back surface of the recording medium 90 by the inkjet head 53 without being taken up by the roller 22 as a take-up roller. Therefore, the inkjet printer 10 can execute double-sided printing with a simple configuration.

  In the inkjet printer 10, since the direction changing member 27 and the direction changing member 29, which are front and back changing mechanisms, change the conveyance direction of the recording medium 90 to the opposite direction, for example, the front and back changing mechanism conveys the recording medium 90 as shown in FIG. Compared to a configuration in which the direction is changed to a direction other than the opposite direction, the overall size in the horizontal direction can be suppressed and the size can be reduced.

  The ink jet printer 10 may have a configuration in which the front / back changing mechanism changes the conveyance direction of the recording medium 90 to a direction other than the opposite direction. That is, the inkjet printer 10 may have a configuration shown in FIG. 7, for example.

  In the configuration shown in FIG. 7, the conveyance direction of the portion of the recording medium 90 that faces the inkjet head 53 is orthogonal to the configuration shown in FIG. The configuration shown in FIG. 7 includes a direction changing member 33 in the middle of the conveyance path from the direction changing member 27 to the direction changing member 29 during double-sided printing. That is, in the configuration shown in FIG. 7, the direction changing member 27, the direction changing member 29, and the direction changing member 33 constitute a front / back changing mechanism. The configuration shown in FIG. 7 can suppress other members such as the inkjet head 43 from being arranged on the upper side in the vertical direction indicated by the arrow 10a with respect to the inkjet head 53, as compared with the configuration shown in FIG. Therefore, there is an advantage that the maintenance of the inkjet head 53 is easy.

  In the above description, the direction changing member 28 is not in contact with the recording medium 90 during double-sided printing as shown in FIG. With this configuration, it is possible to prevent the image printed on the surface of the recording medium 90 by the ink jet head 43 from becoming dirty due to contact with the direction changing member 28. However, the ink constituting the image printed on the surface of the recording medium 90 by the ink jet head 43 may be hardened by contact with the direction changing member 28 until it is conveyed to the position of the direction changing member 28. For example, the direction changing member 28 does not need to be not in contact with the recording medium 90 even during duplex printing.

  In the above description, the pinch roller 32 plays a role of feeding the recording medium 90 during duplex printing. Therefore, for example, if the direction changing member 29 is configured to send the recording medium 90 during duplex printing, the inkjet printer 10 may not include the pinch roller 32. Similarly, when the direction changing member 28 is in contact with the recording medium 90 during double-sided printing and the direction changing member 28 is configured to send the recording medium 90 during double-sided printing, the ink jet printer 10 is configured to use the pinch roller 32. It is not necessary to have.

  In the configuration shown in FIGS. 1, 2, and 5, the inkjet printer 10 feeds the recording medium 90 from the roller 23 and performs printing on the surface of the recording medium 90 by the inkjet head 53 during single-side printing shown in FIG. 5. Thus, the recording medium 90 is wound up by the roller 24. However, as shown in FIG. 8, the inkjet printer 10 feeds the recording medium 90 from the roller 24 and performs printing on the surface of the recording medium 90 by the inkjet head 53 during single-sided printing, and then the recording medium 90 by the roller 23. The structure which winds up may be sufficient.

  In the example shown in FIG. 8, the recording medium 90 disposed between the roller 23 and the roller 24 is conveyed in the direction indicated by the arrow 10g, which is the opposite direction to the direction indicated by the arrow 10f in the example shown in FIG. The In the example shown in FIG. 8, the pinch roller 32 used at the time of double-sided printing is used, so the pinch roller 31 in the example shown in FIG. 5 is unnecessary. In the example shown in FIG. 8, the roller 24 functions as a second single-sided printing feed roller, and the roller 23 functions as a second single-sided printing take-up roller. Also in the example shown in FIG. 8, when the direction changing member 28 or the direction changing member 29 is configured to send the recording medium 90 as described above during double-sided printing, the direction changing member 28 or the direction changing member also during single-sided printing. When 29 is configured to feed the recording medium 90, the pinch roller 32 may not be provided.

  In the configuration shown in FIGS. 1, 2, and 5, the inkjet printer 10 feeds the recording medium 90 from the roller 21 and executes printing on the surface of the recording medium 90 by the inkjet head 43 during single-side printing shown in FIG. 5. Thus, the recording medium 90 is wound up by the roller 22. However, the inkjet printer 10 is configured to wind the recording medium 90 by the roller 21 after feeding the recording medium 90 from the roller 22 and executing printing on the surface of the recording medium 90 by the inkjet head 43 during single-sided printing. Also good.

  In the configuration shown in FIGS. 1, 2, and 5, the inkjet printer 10 feeds the recording medium 90 from the roller 21 and performs printing on the surface of the recording medium 90 by the inkjet head 43 during the double-sided printing shown in FIG. 1. Thus, printing is performed on the back surface of the recording medium 90 by the inkjet head 53 and the recording medium 90 is wound up by the roller 23. However, the ink jet printer 10 feeds the recording medium 90 from the roller 23 and performs printing on the front surface of the recording medium 90 by the ink jet head 53 and then performs printing on the back surface of the recording medium 90 by the ink jet head 43 during duplex printing. Thus, the recording medium 90 may be wound up by the roller 21.

  The ink jet printer 10 can use various types of ink such as water-based textile dye ink, water-based textile pigment ink, solvent ink, UV (UltraViolet) ink, and solvent UV ink. The ink jet printer 10 includes the heaters 44 to 46 and the heaters 54 to 56 in the configuration shown in FIG. 1, but the arrangement of the heaters or the number of the heaters may be changed according to the ink to be used. Is preferred. In addition, the inkjet printer 10 needs to be provided with a device corresponding to the ink to be used when a device that does not have the configuration shown in FIG. 1 such as an ultraviolet irradiation device for curing UV ink or solvent UV ink is required. is there.

10 Inkjet printer 10a Arrow (arrow indicating vertical direction)
20 Conveyance mechanism 21 Roller (Feeding roller for double-sided printing, First feeding roller for single-sided printing)
22 Roller (first single-sided winding roller)
23 Roller (Take-up roller for double-sided printing, Second feeding roller for single-sided printing, Second winding roller for single-sided printing)
24 rollers (second take-up roller for single-sided printing, second supply roller for single-sided printing)
27 Direction change member (front and back change mechanism)
29 Direction change member (front and back change mechanism)
33 Direction change member (front and back change mechanism)
43 Inkjet head (first inkjet head)
43a Nozzle 53 Inkjet head (second inkjet head)
90 recording media

Claims (5)

A transport mechanism for transporting the recording medium;
A first inkjet head and a second inkjet head in which the ejection direction of ink from the nozzle is downward in the vertical direction,
The first inkjet head performs printing on the surface of the recording medium whose surface is an upper surface in a vertical direction,
The transport mechanism includes a front / back change mechanism that changes the front and back of the recording medium so that the back surface of the recording medium printed on the front surface by the first inkjet head is an upper surface in the vertical direction,
The second ink-jet head performs printing on the back surface of the recording medium, the back surface of which is the upper surface in the vertical direction by the front / back changing mechanism. The transport mechanism is
A double-sided printing feed roller that feeds the wound recording medium to the first inkjet head side for double-sided printing by the first inkjet head and the second inkjet head;
2. A double-sided printing take-up roller for winding the recording medium double-sided printed by the first inkjet head and the second inkjet head from the second inkjet head side. The inkjet printer as described. The transport mechanism is
A first single-sided printing feed roller that feeds the wound recording medium to the first inkjet head side for single-sided printing by the first inkjet head;
A first single-sided printing take-up roller that winds up the recording medium that has been printed on one side by the first inkjet head from the first inkjet head side;
A second single-sided printing feed roller for feeding the wound recording medium to the second inkjet head side for single-sided printing by the second inkjet head;
A second roller for single-sided printing, which winds up the recording medium printed on one side by the second inkjet head from the second inkjet head side;
One of the first single-sided printing payout roller and the first single-sided printing take-up roller is the double-sided printing payout roller,
3. The inkjet printer according to claim 2, wherein one of the second single-sided printing feeding roller and the second single-sided printing winding roller is the double-sided printing winding roller. The front / back change mechanism is:
The first inkjet head;
4. The device according to claim 3, wherein the first single-sided printing delivery roller and the first single-sided printing take-up roller are disposed between the first single-sided printing delivery roller and the one other than the double-sided printing delivery roller. inkjet printer.   The ink jet printer according to any one of claims 1 to 4, wherein the front / back change mechanism changes a conveyance direction of the recording medium to an opposite direction.

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