JP2008030899A - Duplex printer and duplex printing method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a duplex printer suitable for duplex printing of long wound sheet-shaped recording media. <P>SOLUTION: The duplex printer 1 has a delivery roller 11 for supplying continuous form paper 6; carrying rollers 21, 31 for carrying the continuous form paper 6 supplied from the delivery roller 11; an IJ head 3 provided before the supply direction of the delivery roller 11 and performing printing processing on the surface of the continuous form paper 6 carried by the carrying rollers 21, 31; a cutter 5 for cutting off, from the supply side, the continuous form paper 6 carried forwardly by the carrying rollers 21, 31 and having one surface to which the printing processing is applied by the IJ head 3; a holding roller 51 comprising a pair of rollers 52, 53 and holding the continuous form paper 6 cut off by the cutter 5 in reversible state to perform the printing processing on the other surface of the continuous form paper 6; and a storing part 60 provided with the holding roller 51 and capable of storing the continuous form paper 6 having one surface in which the printing processing is completed with the continuous form paper 6 held by the holding roller 51. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a double-sided printing apparatus and a double-sided printing method for printing on a sheet-like recording medium (printing object), and a double-sided printing apparatus for printing the other side after printing on one side of the recording medium and the same are used. The present invention relates to a double-sided printing method.

  As a double-sided printing apparatus capable of printing both sides of a sheet-like recording medium, for example, a recording apparatus described in Patent Document 1 has conventionally been provided, and one such recording apparatus is provided on each side of a sheet-like recording medium. A plurality of printing means (inkjet heads) are arranged, and the printing means is simultaneously moved along the recording medium by a drive source, whereby double-sided printing is performed on the recording medium. In a configuration in which printing means are arranged on both sides of a recording medium with both sides of the recording medium and both sides of the recording medium are printed simultaneously, the printing means arranged on one surface of the recording medium and one surface side of the recording medium It is difficult to always make the interval between the printing medium disposed on the other surface of the recording medium and the printing medium disposed on the other surface side of the recording medium uniform. Since the landing positions of the ink droplets on the recording medium differ between the front side and the back side, unevenness occurs in the printed image on the front side and the back side, and it is difficult to obtain a high-quality printed image.

In addition, there is a double-sided printing apparatus that uses a method of printing on one side after printing one surface of a recording medium and then printing the other surface. This method is often used when the recording medium is relatively small, for example, A4 size. Is used. A double-sided printing apparatus using such a method feeds a sheet-like recording medium from a paper feed tray, which is a medium supply means, prints one surface of the recording medium, and then turns the recording medium upside down with a roller and puts it on the paper feed tray side. Once returned, the recording medium is again fed out from the paper feed tray and the other surface of the recording medium is printed.
JP 2002-254718 A

  However, in the case where the recording medium is in the form of a roll wound long, in order to print one surface of the recording medium continuously over a wide area, the recording medium that has finished the printing process on one surface as described above is used. It is difficult to take the method of temporarily returning to the paper feed tray side. On the other hand, when a recording apparatus that simultaneously prints both sides of a recording medium as described in Patent Document 1, the number of inkjet heads is required on each of the front and back sides of the recording medium when performing duplex printing on the recording medium. Yes, it requires an extra number of recording heads than when printing only one surface of the recording medium. For this reason, the cost of the printing machine is increased, and it is difficult to obtain a high-quality printed image as described above. Therefore, the duplex printing apparatus and duplex printing suitable for duplex printing on a long sheet-like recording medium are provided. A printing method is desired.

  In view of the above problems, an object of the present invention is to provide a double-sided printing apparatus suitable for double-sided printing of a long sheet-like recording medium and a double-sided printing method using the same.

  In order to solve the above-described problem, a duplex printing apparatus according to the present invention includes a medium supply unit (for example, the feeding roller 11 in the embodiment) for supplying a sheet-like recording medium (for example, the continuous paper 6 in the embodiment), a medium, and the like. Printing is performed on the surface of the recording medium that is provided in front of the supply direction of the medium supply unit and is conveyed by the conveyance unit (for example, the conveyance rollers 21 and 31 in the embodiment) that conveys the recording medium supplied from the supply unit. Printing means for performing processing (for example, IJ head 3 in the embodiment) and cutting means for separating the recording medium conveyed forward by the conveying means and subjected to printing processing on one surface by the printing means from the supply side (for example, The cutter 5) in the embodiment and the recording medium separated by the cutting means for performing the printing process on the other surface of the recording medium are held in a reversible state. Medium holding means (for example, holding roller 51 in the embodiment) and medium holding capable of holding a recording medium that has been provided with the medium holding means and has been printed on one surface in a state where the recording medium is held by the medium holding means. Part.

  Further, in the double-sided printing apparatus configured as described above, the medium holding unit is disposed in front of the printing unit so as to extend in a direction transverse to the conveyance direction of the recording medium, and holds the front end side of the recording medium so that the recording medium can be forwarded. The pair of rollers (for example, the rollers 52 and 53 in the embodiment) that are held in a state where the pair of rollers is rotated, the pair of rollers rotates in a direction substantially parallel to the longitudinal axis direction of the pair of rollers (for example, in the embodiment). The roller main shaft 79) can be rotated, and the pair of rollers are rotated so that the rotation shafts are interchanged with each other with the recording medium sandwiched therebetween, thereby reversing the recording medium backward. It is preferable to be able to send out (described in the embodiment with reference to FIGS. 1 to 3).

  Further, in the double-sided printing apparatus configured as described above, the medium holding unit is disposed in front of the printing unit so as to extend in a direction transverse to the conveyance direction of the recording medium, and holds the front end side of the recording medium so that the recording medium can be forwarded. A reversing member (for example, a reversing member (for example, rollers 52 and 53 in the embodiment) that is held in a state of being formed and formed in a curved surface that is disposed in front of the pair of rollers and is concavely curved toward the front. The direction switching plate 65) in the embodiment may be provided, and the recording medium fed forward from the medium accommodating portion by the pair of rollers may be guided along the curved surface of the reversing member and reversed backward. (Explained in the embodiment with reference to FIG. 5).

  Further, in the double-sided printing apparatus configured as described above, the medium holding unit is disposed behind the printing unit so as to extend in the transverse direction with respect to the conveyance direction of the recording medium, and the rear end side of the recording medium can be fed backward. A pair of rollers (for example, rollers 52 and 53 in the embodiment) that is held in a sandwiched state, and the pair of rollers rotate in a direction substantially parallel to the longitudinal axis direction of the pair of rollers (for example, the embodiment). The roller main shaft 79) can be rotated, and the pair of rollers are rotated in such a manner that the pair of rollers sandwich the recording medium so that the rotation shafts are interchanged with each other. It may be configured to be able to be sent out (in the embodiment, described with reference to FIGS. 2, 6, and 7).

  Further, in the double-sided printing apparatus configured as described above, the medium holding unit is disposed behind the printing unit so as to extend in the transverse direction with respect to the conveyance direction of the recording medium, and the rear end side of the recording medium can be fed backward. A reversing member (for example, a reversing member formed of a pair of rollers (for example, rollers 52 and 53 in the embodiment) that is held in a sandwiched state and formed behind the pair of rollers and curved in a concave shape toward the rear. The direction switching plate 66 in the embodiment may be configured so that the recording medium fed backward from the medium accommodating portion by the pair of rollers is guided along the curved surface of the reversing member and reversed forward. Good (explained in the embodiment with reference to FIG. 8).

  Further, the double-sided printing apparatus having the above-described configuration includes an operation control unit (for example, the operation control device 70 in the embodiment) that controls the operation of the conveying unit, and the recording medium fed from the medium storage unit is controlled by the operation control unit. It is preferable that printing is performed on the other surface of the recording medium by being conveyed rearward so as to match the printing position with one surface of the recording medium by the conveying means (described in the embodiment with reference to FIG. 4). ).

  Further, the double-sided printing apparatus having the above-described configuration includes an operation control unit (for example, the operation control device 70 in the embodiment) that controls the operation of the conveying unit, and the recording medium fed from the medium storage unit is controlled by the operation control unit. In this embodiment, the printing unit may be configured to carry forward printing so that the printing position on one surface of the recording medium is aligned with the other surface of the recording medium. To explain).

  In the double-sided printing apparatus configured as described above, it is preferable that the pair of rollers can be attached to and detached from the medium accommodating portion.

  In addition, in order to solve the above problems, the double-sided printing method according to the present invention includes a printing unit (for example, in the embodiment) in which a sheet-like recording medium (for example, the continuous paper 6 in the embodiment) is provided in front of the supply direction. IJ head 3) is supplied to the front side, and one surface of the recording medium conveyed forward is printed by the printing means, and the recording medium subjected to the printing process on one surface is separated from the supply side. A recording medium is accommodated in the medium accommodating portion in a state where it can be reversed by the medium retaining means according to any one of claims 1 to 8 in order to perform a printing process on the other surface, and to the outside of the medium accommodating portion. The recording medium sent out is reversed, and the reversed recording medium is supplied to the printing means to print the other surface of the recording medium.

  According to the double-sided printing apparatus and the double-sided printing method using the same according to the present invention, after the printing process on one surface of the recording medium is completed, the recording medium is temporarily stored in the medium storage unit while being held by the medium holding unit. Thus, unlike the conventional case, the recording medium is not sent to the winding device or temporarily returned to the medium supply unit for printing on the other surface of the recording medium. For this reason, it is suitable for printing a roll-shaped recording medium wound long, and printing of a recording medium having a long printing range is possible. The pair of rollers that sandwich the recording medium rotate so as to be interchanged with each other while the recording medium is sandwiched, or the recording medium is reversed by using the reversing member to reverse the recording medium conveyance direction. After the printing on one surface of the recording medium, the printing process on the other surface of the recording medium can be easily performed. In addition, since the recording medium is reversed to perform the printing process on the other surface, there is no need to arrange printing means on both sides of the recording medium, that is, there is no need to increase the number of printing means, and low An inexpensive double-sided printing apparatus can be provided. Further, unlike the case where printing means are arranged on both sides of the recording medium, the distance between one surface of the recording medium and the printing means and the distance between the other surface of the recording medium and the printing means are uniform. Therefore, there is no unevenness in the printed image between the front side and the back side, and a high-quality printed image can be obtained.

  In addition, when the pair of rollers holds the front end side of the recording medium after printing on one side of the recording medium, there is no movement of the medium accommodating portion, so the other side is printed in a short time after printing on one side of the recording medium. It is possible to start printing on this surface. On the other hand, after printing on one side of the recording medium, when the recording medium is transported forward with a pair of rollers sandwiching the rear end side of the recording medium, printing on one side of the recording medium and recording are performed. Since the conveyance direction of the recording medium is the same as when the other side of the medium is printed, and it is not necessary to change the rotation direction of the conveyance unit, rotation control of the conveyance unit can be simplified. In this way, by changing the method for holding the recording medium in accordance with the usage situation of the user, it is possible to provide a printing apparatus having advantages.

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

  First, the apparatus configuration of the duplex printing apparatus 1 will be described with reference to FIG. For convenience of explanation, the directions of arrows indicated as “front”, “left”, and “up” in the figure are respectively forward, left, and upward. The double-sided printing apparatus 1 includes a printing unit including an inkjet head 3 (hereinafter referred to as “IJ head 3”), a platen 2 that supports a part of continuous paper 6 that is a sheet-like recording medium, and continuous paper. Is fed forward by the feeding rollers 11 for feeding the continuous paper 6 fed from the feeding roller 11, the feeding rollers 11 for feeding the continuous paper 6 supplied from the feeding roller 11, and printing. The cutter 5 for cutting the continuous paper 6 whose surface is printed by the means from the supply side, and the continuous paper 6 cut for performing the printing process on the back surface of the continuous paper 6 are held in a reversible state. A holding roller 51 that is attached to and removed from the holding roller 51, and a medium storage unit 60 that stores the continuous paper 6 that has been printed on the surface while being held by the holding roller 51. Winding rollers 41 and 43 for winding the continuous paper 6, an electric motor 71 and the like for rotationally driving the feeding roller 11 and the like, and an operation control device 70 for controlling the operation of the electric motor 71 are provided. Configured.

  The operation control device 70 includes a processing unit (CPU), and controls the operation of the electric motor 71 and the like by outputting a control signal to the electric motor 71 and the like composed of a servo motor or the like according to a command from the processing unit. Is possible. The operation control device 70 may be a personal computer that is provided outside the double-sided printing device 1 and can communicate with the double-sided printing device 1. In this case, the operation of the electric motor 71 or the like is activated by a command signal from the personal computer. Is controlled.

  The IJ head 3 is horizontally movable left and right along a guide rail (not shown) via a drive belt 4 extending left and right by an electric motor 77. A cutter 5 protruding downward is detachably attached to the IJ head 3 on the lower surface of the IJ head 3. The cutter 5 can move left and right above the platen 2 along with the movement of the IJ head 3. Further, the IJ head 3 is configured to be movable up and down with respect to the guide rail, and the cutter 5 can be moved up and down together with the vertical movement of the IJ head 3.

  A conveyance roller 21 is provided behind the platen 2, and a conveyance roller 31 is provided in front of the platen 2. The transport roller 21 includes a feed roller 22 having a drive shaft 24 that can be rotated by an electric motor 72, and a press roller 23 that rotates in a direction opposite to the rotation direction of the feed roller 22 together with the rotation of the feed roller 22. . The transport roller 31 includes a feed roller 32 having a drive shaft 34 that can be rotated by an electric motor 73, and a press roller 33 that rotates in a direction opposite to the rotation direction of the feed roller 32 together with the rotation of the feed roller 32. .

  When the feed roller 22 and the feed roller 32 rotate in the clockwise direction in FIG. 1, the continuous paper 6 sandwiched between the feed roller 22 and the press roller 23 can be fed forward. is there. When the feed roller 22 and the feed roller 32 rotate counterclockwise in FIG. 1, the continuous paper 6 sandwiched between the feed roller 22 and the press roller 33 is fed backward. Is possible.

  A delivery roller 11 having a drive shaft 12 that can be rotated by an electric motor 71 is provided behind the transport roller 21. When the feed roller 11 rotates counterclockwise in FIG. 1, the continuous paper 6 is sent toward the front transport roller 21.

  In front of the transport roller 31, there is provided a medium container 60 having a bottomed box shape with the upper part opened up and down, and a continuous paper whose surface is subjected to printing processing is provided in the medium container 60. 6 can be accommodated inside through the opening.

  A take-up roller 41 having a drive shaft 42 that can be rotated by an electric motor 74 is provided in front of the medium housing portion 60. When the take-up roller 41 rotates counterclockwise in FIG. 1, the continuous paper 6 is taken up by the take-up roller 41. A take-up roller 43 having a drive shaft 44 that can be rotated by an electric motor 76 is provided between the feed roller 11 and the transport roller 21. When the take-up roller 43 rotates counterclockwise in FIG. 1, the continuous paper 6 is taken up by the take-up roller 43.

  A holding roller 51 having a drive shaft 54 that can be rotated by an electric motor 75 is installed on the front side (winding roller 41 side) of the medium accommodating unit 60. A mechanism diagram around the holding roller 51 and the electric motor 75 is shown in FIG. As shown in FIG. 2, the holding roller 51 is composed of a pair of rollers including a roller 52 and a roller 53. Each of these rollers 52 and 53 has a substantially cylindrical shape arranged extending in the lateral direction with respect to the conveying direction of the continuous paper 6. The roller 52 has a rotation shaft 54 extending in the longitudinal axis direction, and a gear 56 is supported on the rotation shaft 54, and the roller 52 rotates in the same rotation direction as the gear 56 as the gear 56 rotates. The roller 53 has a rotary shaft 55 extending in the longitudinal axis direction, and a gear 57 is supported on the rotary shaft 55, and the roller 53 rotates in the same rotational direction as the gear 57 as the gear 57 rotates.

  End portions of the rotating shaft 54 and the rotating shaft 55 are attached to a substantially disc-shaped roller shaft plate 80 via bearings 81 and 82 having bearings, respectively, so as to be rotatable relative to the roller shaft plate 80. For this reason, even if the rotating shaft 54 and the rotating shaft 55 rotate, the roller shaft plate 80 does not rotate but the rotating shaft 54 and the rotating shaft 55 rotate smoothly relative to the roller shaft plate 80.

  In the state shown in FIG. 2, the gear 56 meshes with the gear 58, and the gear 59 meshes with the gear 58 to form a gear train including the gear 56, the gear 58, and the gear 59. And rotate in the same direction of rotation. The gear 59 is supported by a rotating shaft 77 of the electric motor 75 and rotates in the same rotational direction as the electric motor 75 rotates.

  Under such a configuration, when the electric motor 75 is driven, the rotational driving force is transmitted to the roller 52 through the gear train including the gear 56, the gear 58, and the gear 59, and the roller 52 is rotated in the rotational direction of the electric motor 75. Rotate in the same direction. Due to the rotation of the roller 52, the roller 53 rotates in the direction opposite to the rotation direction of the roller 52. In the state shown in FIG. 2, the roller 52 is a driving roller to which the driving force of the electric motor 75 is transmitted, and the roller 53 is a driven roller that rotates in the direction opposite to the rotation direction of the roller 52.

  The roller shaft plate 80 is pivotally supported by a roller main shaft 79 connected to the electric motor 78, and is driven in the direction of arrow A or the direction of arrow B opposite to the direction of the arrow A with the roller main shaft 79 as a rotation axis by the driving force of the electric motor 78. It can be rotated. For this reason, as shown in FIG. 2, the roller shaft plate 80 rotates around the roller main shaft 79 as a rotation axis from the state where the gear 56 meshes with the gear 58 and the driving force of the motor 75 is transmitted to the roller 52. Thus, the gear 57 meshes with the gear 58, and the driving force of the electric motor 75 is transmitted to the roller 53. In this state, the roller 53 is a drive roller, and the roller 52 is a driven roller that rotates in the direction opposite to the rotation direction of the roller 53.

  Hereinafter, double-sided printing using the double-sided printing apparatus 1 will be described in detail with reference to FIGS. 3 to 5.

  The continuous paper 6 is fed from the feed roller 11 and is fed forward on the platen 2 by the transport roller 21. When the continuous paper 6 passes below the IJ head 3, one surface (front surface) of the continuous paper 6 is printed, and the continuous paper 6 is sent to the medium accommodation unit 60 side by the conveyance roller 31. Then, immediately after the front end of the continuous paper 6 passes through the holding roller 51 (rollers 52, 53), the rotation of the rollers 52, 53 stops while the front end of the continuous paper 6 is held by the rollers 52, 53. In this state, since the feeding roller 11 and the transport rollers 21 and 31 are rotating, the continuous paper 6 is transported to the rollers 52 and 53, and the front end is held by the rollers 52 and 53 as shown in FIG. In this state, the continuous paper 6 is stored in the medium storage unit 60.

  When the printing of the surface of the continuous paper 6 is completed by the control signal from the operation control device 70, the continuous paper 6 is separated from the supply side by the cutter 5, and among the separated continuous paper 6, the continuous paper 6 on the medium storage unit 60 side. Is transported forward by the transport roller 31, and the continuous paper 6 that has been printed on the front side while the front end of the continuous paper 6 is held by the rollers 52 and 53 as shown in FIG. 60.

  Subsequently, the rollers 52 and 53 rotate in the clockwise direction (arrow A direction) in FIG. 3B with the roller main shaft 79 as the rotation axis, and the continuous paper 6 is reversed as shown in FIG. 3C. The back side of the continuous paper 6 faces upward, and the continuous paper 6 can be sent backward. In this state, the operation control device 70 controls the roller 53 to rotate clockwise in FIG. 3C, and the front end of the continuous paper 6 moves toward the transport roller 31. The feed rollers 32 and 22 are controlled by the operation control device 70 so as to rotate counterclockwise, and the continuous paper 6 is conveyed onto the platen 2 by the conveyance roller 31.

  Then, when the back surface of the continuous paper 6 passes below the IJ head 3, a printing process is performed on the back surface side of the continuous paper 6. Here, the rotation of the feed rollers 32 and 22 is controlled by the operation control device 70, so that the continuous paper 6 is conveyed rearward so as to match the printing position with the front surface side, and printing processing is performed on the back surface side of the continuous paper 6. Is given. The continuous paper 6 subjected to the printing process on the back side is sent to the take-up roller 43 by the transport roller 21 and taken up by the take-up roller 43 (see FIG. 4).

  Note that, after printing on the front side of the continuous paper 6, switching of the transport direction of the continuous paper 6 for printing the back side of the continuous paper 6 is installed in front of the transport roller 31 and the holding roller 51 as shown in FIG. Alternatively, the direction switching plate 65 may be used. The direction switching plate 65 is formed with a curved surface 67 that is curved concavely toward the front. Therefore, the front end of the continuous paper 6 is held by the holding roller 51 by the roller 52 that is controlled by the operation control device 70 to rotate counterclockwise and the roller 53 that rotates clockwise together with the rotation of the roller 52. Thus, the continuous paper 6 accommodated in the medium accommodating portion 60 is fed forward, moves so as to be guided along the curved surface 67 of the direction switching plate 65, reverses backward, and moves toward the conveying roller 31 side.

  The feed rollers 32 and 22 are controlled by the operation control device 70 so as to rotate counterclockwise, and the continuous paper 6 is conveyed onto the platen 2 by the conveyance roller 31. Then, when the back surface of the continuous paper 6 passes below the IJ head 3, a printing process is performed on the back surface of the continuous paper 6. Here, the rotation of the feed rollers 32 and 22 is controlled by the operation control device 70, so that the continuous paper 6 is conveyed rearward so as to match the printing position with the front surface side, and printing processing is performed on the back surface side of the continuous paper 6. Is given. The continuous paper 6 subjected to the printing process on the back side is sent to the take-up roller 43 by the transport roller 21 and taken up by the take-up roller 43.

  Next, a second embodiment of the double-sided printing apparatus will be described with reference to FIGS. 6 to 9, focusing on parts different from the first embodiment. Also in the present embodiment, the directions of arrows indicated as “front”, “left”, and “up” in the drawing are respectively forward, left, and upward. As shown in FIG. 6, the double-sided printing apparatus 1 ′ is similar to the double-sided printing apparatus 1 in that the printing unit including the IJ head 3 and the like, the platen 2, the delivery roller 11, the transport rollers 21 and 31, and the cutter 5. A holding roller 51, a medium accommodating unit 60 to which the holding roller 51 can be attached and removed, take-up rollers 41 and 43, a carry roller 45 for carrying the continuous paper 6 to the take-up roller 41, An electric motor 71 and the like, and an operation control device 70 are included.

  The arrangement configuration of the delivery roller 11, the transport rollers 21, 31, the medium storage unit 60, and the like in this embodiment is the same as that in the first embodiment. In contrast, in this embodiment, the holding roller 51 is provided at the rear portion of the medium accommodating portion 60.

  The medium storage unit 60 is placed on a transport means (cart) (not shown) and is automatically moved back and forth under the control of the operation control device 70, or manually moved back and forth by an operator. Can be done.

  In such a configuration of the duplex printing apparatus 1 ′, the continuous paper 6 fed forward from the feed roller 11 is printed on the front side when passing below the IJ head 3, and is conveyed by the transport roller 31 to the medium storage unit 60. Sent to the side. The medium storage unit 60 stores the continuous paper 6 whose surface is subjected to printing processing from the front end side.

  When the printing on the front side of the continuous paper 6 is completed, the continuous paper 6 is separated from the supply side by the cutter 5, and the continuous paper 6 on the medium storage unit 60 side of the separated continuous paper 6 is conveyed forward by the conveyance roller 31. Then, the rear end side of the continuous paper 6 is held by rollers 52 and 53 as shown in FIG. Thereafter, the medium storage unit 60 is automatically moved to the rear of the transport roller 21 under the control of the operation control device 70, or is manually transported to the rear of the transport roller 21 by an operator (see FIG. 7B). ). The medium accommodating portion 60 conveyed to the rear of the conveying roller 21 is oriented so that the holding roller 51 (rollers 52 and 53) attached to the medium accommodating portion 60 is positioned on the rear side of the medium accommodating portion 60. Installed behind the transport roller 21.

  Subsequently, the rollers 52 and 53 rotate counterclockwise (arrow B direction) in FIG. 7B with the roller main shaft 79 as the rotation axis, and the continuous paper 6 is reversed as shown in FIG. 7B. As a result, the back side of the continuous paper 6 faces upward and the continuous paper 6 can be sent forward. In this state, the operation control device 70 controls the rollers 52 and 53 to rotate counterclockwise in FIG. 7B in this state, and the front end of the continuous paper 6 faces the transport roller 21. The feed rollers 22 and 32 are controlled by the operation control device 70 so as to rotate in the clockwise direction, and the continuous paper 6 is conveyed onto the platen 2 by the conveyance roller 21.

  Then, when the back surface of the continuous paper 6 passes below the IJ head 3, a printing process is performed on the back surface of the continuous paper 6. Here, by controlling the rotation of the feed rollers 22 and 32 by the operation control device 70, the continuous paper 6 is conveyed forward so as to match the printing position with the front surface side, and printing processing is performed on the back surface side of the continuous paper 6. Is given. The continuous paper 6 subjected to the printing process on the back side is sent to the take-up roller 41 by the transport rollers 31 and 45 and taken up by the take-up roller 41 (see FIG. 9).

  In addition, after printing on the front surface side of the continuous paper 6, switching of the transport direction of the continuous paper 6 for printing the back surface side of the continuous paper 6 is installed behind the transport roller 21 and the holding roller 51 as shown in FIG. Alternatively, the direction switching plate 66 may be used. The direction switching plate 66 is formed with a curved surface 68 that is concavely curved toward the rear. For this reason, the trailing edge of the continuous paper 6 is held by the holding roller 51 by the roller 52 that is controlled by the operation control device 70 to rotate counterclockwise and the roller 53 that rotates clockwise together with the rotation of the roller 52. The continuous paper 6 accommodated in the medium accommodating portion 60 in the state is fed rearward, moved so as to be guided along the curved surface 68 of the direction switching plate 65, reversed to the front, and directed toward the conveying roller 21. .

  The feed rollers 22 and 32 are controlled by an operation control device 70 so as to rotate in the clockwise direction, and the continuous paper 6 is conveyed onto the platen 2 by the conveyance roller 21. Then, when the back surface of the continuous paper 6 passes below the IJ head 3, a printing process is performed on the back surface of the continuous paper 6. Here, by controlling the rotation of the feed rollers 22 and 32 by the operation control device 70, the continuous paper 6 is conveyed rearward so as to match the printing position with the front surface side, and printing processing is performed on the back surface side of the continuous paper 6. Is given. The continuous paper 6 subjected to the printing process on the back side is sent to the take-up roller 41 by the transport rollers 31 and 45 and taken up by the take-up roller 41.

  In this embodiment, after printing on the front side of the continuous paper 6, the medium storage unit 60 is automatically moved to the rear of the transport roller 21 under the control of the operation control device 70, or the transport roller is manually operated by an operator. However, the present invention is not limited to this configuration, and the rollers 52 and 53 are removed from the medium accommodating portion 60 and only the rollers 52 and 53 are moved without moving the medium accommodating portion 60 rearward. You may arrange | position behind the conveyance roller 21. FIG. Even with such a configuration, after printing on the front side of the continuous paper 6, it is possible to turn the continuous paper 6 over and print the back side of the continuous paper 6.

  The embodiment of the present invention has been described above. The method for switching the printing surface of the continuous paper 6 using the duplex printing apparatus 1 (1 ′) is summarized in FIG. As described in the first exemplary embodiment, when the continuous paper 6 is stored in the medium storage unit 60 while the front end side of the continuous paper 6 is held after printing on the front side of the continuous paper 6, the medium storage unit 60 is moved. Therefore, after printing on the front side of the continuous paper 6, it is possible to start printing on the back side in a short time because the time for moving the medium storage unit 60 is unnecessary. On the other hand, as described in the second embodiment, after printing the surface of the continuous paper 6, the continuous paper 6 is stored in the medium storage unit 60 while the rear end side of the continuous paper 6 is held, and the medium storage unit 60 is moved backward. In the case of moving to the, the conveyance direction of the continuous paper 6 is the same during the printing process on the front surface side and the printing process on the back surface side of the continuous paper 6, so it is necessary to change the rotation direction of the feed rollers 22 and 32. The rotation control of the electric motors 72 and 73 by the operation control device 70 can be simplified.

It is a side view which shows typically the double-sided printing apparatus which concerns on this invention. It is a perspective view which shows the holding roller periphery provided in the said double-sided printing apparatus. It is a figure which shows the double-sided printing of the continuous paper using the said double-sided printing apparatus in order of (a)-(c). It is a figure which shows the mode of printing on the back surface side of the continuous paper using the said double-sided printing apparatus. It is a figure which shows the double-sided printing of the continuous paper using a direction switching board. It is a typical side view in 2nd Example of the double-sided printing apparatus which concerns on this invention. It is a figure which shows the double-sided printing of the continuous paper in 2nd Example using the said double-sided printing apparatus in order of (a), (b). It is a figure which shows the double-sided printing of the continuous paper using the direction switching board in 2nd Example. It is a figure which shows the mode of printing on the back surface side of the continuous paper in 2nd Example. It is a figure showing about the switching method of the printing surface of a continuous paper.

Explanation of symbols

1, 1 'double-sided printing device 2 platen 3 IJ head (printing means)
4 Drive belt 5 Cutter (cutting means)
6 Continuous paper (recording medium)
11 Feeding roller (medium supply unit)
21 Conveying roller (conveying means)
22, 32 Feed rollers 23, 33 Pressing roller 31 Conveying roller (conveying means)
41, 43 Winding roller 51 Holding roller (medium holding means)
52 rollers (a pair of rollers)
53 rollers (a pair of rollers)
60 Medium accommodating portion 65, 66 Direction switching plate (reversing member)
67, 68 Curved surface 70 Operation control device (operation control means)
71-76,78 Electric motor (operation control means)
77 Electric motor 79 Roller spindle (rotating shaft)
80 Roller shaft 81 Bearing 82 Bearing

Claims (9)

  A medium supply unit that supplies a sheet-like recording medium, a conveyance unit that conveys the recording medium supplied from the medium supply unit, and a recording that is provided in front of the supply direction of the medium supply unit and is conveyed by the conveyance unit A printing unit that performs a printing process on the surface of the medium; a cutting unit that separates from the supply side a recording medium that has been transported forward by the transporting unit and that has been subjected to the printing process by the printing unit; and the other of the recording media A medium holding means for holding the recording medium separated by the cutting means in a reversible state in order to perform a printing process on the surface, and a state in which the medium holding means is provided and the recording medium is held by the medium holding means And a medium accommodating portion capable of accommodating a recording medium on which one surface has been printed. A pair of rollers for holding the recording medium in a state where the recording medium is held in front of the printing means so as to extend in a direction transverse to the conveyance direction of the recording medium so that the recording medium can be fed forward. Consists of
The pair of rollers is rotatable about a rotation axis in a direction substantially parallel to the longitudinal axis direction of the pair of rollers,
By rotating the pair of rollers so as to be interchanged with the rotation shaft as a rotation center in a state where the recording medium is sandwiched, the recording medium can be reversed and sent backward. The double-sided printing apparatus according to claim 1. A pair of rollers for holding the recording medium in a state where the recording medium is held in front of the printing means so as to extend in a direction transverse to the conveyance direction of the recording medium so that the recording medium can be fed forward. Consists of
A reversing member disposed in front of the pair of rollers and formed with a curved surface curved concavely toward the front;
The duplex printing apparatus according to claim 1, wherein the recording medium fed forward from the medium accommodating portion by the pair of rollers is guided along the curved surface of the reversing member and reversed backward. A pair of the medium holding means are arranged behind the printing means so as to extend in a direction transverse to the conveyance direction of the recording medium and hold the recording medium in a state where the recording medium is sandwiched on the rear end side so that the recording medium can be sent backward. Composed of rollers,
The pair of rollers is rotatable about a rotation axis in a direction substantially parallel to the longitudinal axis direction of the pair of rollers,
By rotating the pair of rollers so as to be interchanged with each other with the rotation shaft as a rotation center in a state where the recording medium is sandwiched, the recording medium can be reversed and sent forward. The double-sided printing apparatus according to claim 1. A pair of the medium holding means are arranged behind the printing means so as to extend in a direction transverse to the conveyance direction of the recording medium and hold the recording medium in a state where the recording medium is sandwiched on the rear end side so that the recording medium can be sent backward. Composed of rollers,
A reversing member that is disposed behind the pair of rollers and has a curved surface that is curved concavely toward the rear;
The double-sided printing apparatus according to claim 1, wherein the recording medium fed backward from the medium accommodating portion by the pair of rollers is guided along the curved surface of the reversing member and reversed forward. An operation control means for controlling the operation of the conveying means;
The recording medium sent out from the medium container is conveyed rearward by the conveying means controlled by the operation control means so as to match the printing position with one surface of the recording medium, and is conveyed to the other surface of the recording medium. 4. The duplex printing apparatus according to claim 2, wherein a printing process is performed. An operation control means for controlling the operation of the conveying means;
The recording medium sent out from the medium accommodating portion is conveyed forward by the conveying means controlled by the operation control means so as to match the printing position with one surface of the recording medium, and is conveyed to the other surface of the recording medium. The double-sided printing apparatus according to claim 4 or 5, wherein a printing process is performed.   The double-sided printing apparatus according to claim 2, wherein the pair of rollers can be attached to and detached from the medium accommodating portion.   A sheet-like recording medium is supplied to printing means provided in the front of the supply direction, one surface of the recording medium conveyed forward is printed by the printing means, and the recording process is performed on one surface. 9. A recording medium in a state in which the medium is separated from the supply side and held in a reversible state by the medium holding means according to claim 1 in order to perform a printing process on the other surface of the separated recording medium. In the medium container, the recording medium fed out of the medium container is reversed, the reversed recording medium is supplied to the printing means, and the other surface of the recording medium is printed. A duplex printing method using the duplex printing apparatus according to claim 1.

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