JP2010076878A - Image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming device capable of preventing a recording medium from being taken out by a user after an image is formed on one side surface in a double-sided printing. <P>SOLUTION: A part of a nonlinear section guide 54 which constitutes an inversion path W4 is opened by the movement of a first movable wall 56 and a second movable wall 60 to a horizontal position P2, and a horizontal distance extending from an image formation position P toward the inversion path W4 is extended. In the double-sided printing, a recording sheet S on one side surface of which an image has been formed is stored between a discharge port 12A and the outer end of a horizontal support member 66 to ready for drying. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus capable of duplex printing.

  In a small-sized image forming apparatus capable of duplex printing, in particular, after printing on one side, the recording medium sometimes protrudes outside the housing of the apparatus, and then printing on the other side may be performed. Thus, if the recording medium goes out of the housing after printing on one side, the user may take out the recording medium before printing on the other side.

  In order to prevent such removal by the user, it is conceivable to shorten the waiting time until the printing on the other side after the printing on the one side is completed. For example, in Patent Document 1, a pause time is provided at the time of intermittent printing in order to shorten the waiting time until the printing of the other surface after the printing on one surface is completed.

  However, since the technique described in Patent Document 1 merely shortens the standby time, there is a high possibility that the recording medium is taken out by the user during the standby time.

Further, in a small image forming apparatus, there is a fact that a horizontal distance of a conveyance path for conveying a recording medium is short.
JP 2004-314506 A

  The present invention has been made in consideration of the above facts, and an object of the present invention is to provide an image forming apparatus capable of preventing a user from taking out a recording medium after image formation on one side during double-sided printing.

  In order to solve the above problem, an image forming apparatus according to a first aspect of the present invention provides at least one of the recording media after double-sided printing and after the end of image formation on one side of the recording medium and before the start of image formation on the other side. An image forming apparatus having a portion disposed outside a housing, wherein the recording head is provided in the housing and ejects droplets onto the recording medium to form an image on the recording medium. A main transport path for transporting the image to the image forming position at the head, a discharge transport path for transporting the recording medium from the image forming position through the discharge port to the outside of the housing, and after forming the image on one side of the recording medium. The conveyance path having a reverse conveyance path for conveying the recording medium to the image forming position with the front and back being reversed, and a non-linear portion in the conveyance path, are stored in the housing after image formation on one side is completed. Recorded media image The surface of the formed side is provided with a movable wall part is movable in the wall of the transport path to the non-contact to become non-contact position with the wall surface of the transport path.

  In the image forming apparatus according to the first aspect of the present invention, a movable wall is formed in the non-linear portion in the conveyance path. The movable wall is movable to a non-contact position. The non-contact position is a position where the surface on the image forming side of the recording medium housed in the housing after the image formation on one side is not in contact with the wall surface of the conveyance path.

  According to the present invention, at the time of double-sided printing, after completion of image formation on one side of the recording medium, at least a part of the recording medium is disposed outside the housing, but the recording medium is moved by moving the movable wall to the non-contact position. By storing in the housing, removal by the user can be prevented.

  Further, by moving the movable wall to the non-contact position, it is possible to keep the surface on the image forming side of the recording medium stored in the housing from contacting the wall surface of the conveyance path after the image formation on one side is completed. It is possible to prevent the formed image from becoming dirty.

  In the movable wall of the present invention, as described in claim 2, the end of the recording medium after the image formation on one side is far from the discharge port protrudes to the outside of the conveyance path. It can be set as the structure which can be moved to.

  As described above, by projecting the edge of the recording medium to the outside of the conveyance path, it is possible to prevent the surface of the recording medium on the image forming side of the non-linear portion from contacting the wall of the conveyance path.

  According to a third aspect of the present invention, the transport path of the present invention has a horizontal transport section that extends in the horizontal direction including the image forming position, and the movable wall is a horizontal continuous from the horizontal transport path. It can be configured to be movable so as to extend the distance.

  In this way, by extending the horizontal distance, the recording medium after image formation can be stored in the housing in a horizontal state.

  Further, according to a fourth aspect of the present invention, a horizontal support member that supports a lower side of the recording medium protruding outside the conveyance path in the non-linear portion can be provided.

  Thus, by providing the horizontal support member, the recording medium can be stably supported.

  The image forming apparatus according to claim 5 of the present invention is provided so as to protrude from the outer surface of the housing, and at the time of double-sided printing, after the image formation on one side of the recording medium is completed, before the image formation on the other side is started, A drying display unit for displaying that the apparatus is waiting for drying is further provided.

  By providing the above-described display section during drying, it is possible to display that it is waiting for drying and to inform the user accordingly.

  The image forming apparatus according to claim 6 of the present invention further includes a standby time display unit that displays a standby time from the end of image formation on one side of the recording medium to the start of image formation on the other side during double-sided printing. I have.

  By providing the standby time display unit, the user can be notified of the standby time.

  In the image forming apparatus according to claim 7 of the present invention, at the time of double-sided printing, at least a part of the recording medium is outside the housing after the image formation on one side of the recording medium is completed and before the image formation on the other side is started. An image forming apparatus to be disposed, wherein a recording head that discharges liquid droplets to the recording medium to form an image on the recording medium, and an image forming unit that is provided in the casing and the recording medium is formed by the recording head. A main transport path for transporting the recording medium to the position, a discharge transport path for transporting the recording medium from the image forming position through the discharge port to the outside of the housing, and after image formation on one side, the front and back of the recording medium are reversed. A conveying path having a reverse conveying path that conveys the recording medium to the image forming position, and a storage and drying unit that stores the recording medium in the housing and dries after completion of image formation on one surface of the recording medium. , With.

  According to the image forming apparatus of the seventh aspect, after the image formation on one side is completed, the recording medium is stored in the housing and dried by the storing and drying means, so that the user can take out the recording medium while drying the recording medium. Can be prevented.

  Since the present invention is configured as described above, it is possible to prevent the user from taking out the recording medium after image formation on one side during double-sided printing.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an ink jet printer 10 to which a recording method according to the present invention can be applied. The ink jet printer 10 corresponds to the image forming apparatus according to the present invention.

  The ink jet printer 10 includes a housing 12. The housing 12 has a box shape. The ink jet printer 10 is provided with a paper feed tray 14 on the upper right side in FIG. The paper feed tray 14 can set recording sheets of various sizes on the paper feed tray 14. The paper feed tray 14 is disposed outside the housing 12.

  A paper feed cassette 16 is set on the lower side (bottom side) of the housing 12 of the inkjet printer 10. The paper feed cassette 16 can set a recording sheet S of a predetermined size in the paper feed cassette 16.

  A discharge tray 20 is provided on the left side of the inkjet printer 10 in FIG. The discharge tray 20 extends outward from a discharge port 12 </ b> A formed in the housing 12 and is provided outside the housing 12. On the discharge tray 20, an image (for example, a character image or a photographic image) is recorded, and the recording sheet S discharged from the discharge port 12A is placed.

  The ink jet printer 10 includes a recording head 30. The recording head 30 is disposed in the housing 12. The recording head 30 includes an ink discharge nozzle (not shown). The recording head 30 can be reciprocated in the front-back direction (scanning direction) in FIG. 1 by a mechanism (not shown). Image formation by the recording head 30 is performed by ejecting ink from the ink ejection nozzles to the recording sheet S while scanning the recording head 30.

  A plurality of conveyance paths for conveying the recording sheet S are configured in the housing 12. As the transport path, a first transport path W1 for transporting the recording sheet S from the paper feed tray 14, and a main transport path W2 from the downstream side of the first transport path W1 to the image forming position P where the recording head 30 performs image formation. The second delivery path W3 for delivering the recording sheet S from the paper feed cassette 16 to the upstream side of the main transport path W2, and connects the intermediate portion of the main transport path W2 and the intermediate portion of the second delivery path W3 and the second delivery path. A reversing path W4 that joins W3 and transports the recording sheet S upstream of the main transport path W2 and a discharge path W5 from the image forming position P to the discharge port 12A are formed.

  A pickup roller 40 that is rotationally driven by a roller driving unit 49 (see FIG. 3) is disposed on the upstream side of the first delivery path W1. The pickup roller 40 can be brought into contact with the top surface on the front end side of the recording sheet S set on the paper feed tray 14. As the pickup roller 40 rotates, the uppermost recording sheet S set on the paper feed tray 14 is sent out toward the first delivery path W1.

  In the main conveyance path W2, conveyance roller pairs 41 and 42 that are rotationally driven by a roller driving unit 49 are disposed. The conveyance roller pair 42 is disposed at a position close to the recording head 30, and the conveyance roller pair 41 is disposed on the upstream side of the conveyance roller pair 42 and on the recording head 30 side than the branch portion with the reversing path W <b> 4. ing.

  A pickup roller 44 that is rotationally driven by a roller driving unit 49 is disposed on the upstream side of the second delivery path W3. The pickup roller 44 can be brought into contact with the top surface on the front end side of the recording sheet S set in the paper feed cassette 16. As the pickup roller 44 rotates, the uppermost recording sheet S set in the paper feed cassette 16 is sent out toward the second delivery path W3.

  A conveying roller pair 45 rotated by a roller driving unit 49 is disposed on the reversing path W4. The conveyance roller pair 45 is disposed at an intermediate portion of the reversing path W4. A pair of conveyance rollers 43 is disposed on the main conveyance path W2 side from a portion where the reversal path W4 joins the second delivery path W3.

  In the discharge path W5, a discharge roller pair 46 rotated by a roller driving unit 49 is disposed. The discharge roller pair 46 is disposed at a position close to the recording head 30. The lower side of the discharge path W5 is constituted by a part of the discharge tray 20, and the discharge tray 20 is disposed in the horizontal direction between the discharge port 12A and the discharge roller pair 46.

  An image forming position P is configured between the conveyance roller pair 42 and the discharge roller pair 46. The image forming position P is configured between the recording head 30 and a platen 50 provided so as to be opposed to the recording head 30. At the image forming position P, the recording sheet S is placed on the platen 50 to form an image.

  A lower side wall of the main conveyance path W <b> 2 between the conveyance roller pair 41 and the conveyance roller pair 42 is configured by a guide member 51. A lower wall of the reverse path W4 between the conveyance roller pair 41 and the conveyance roller pair 45 is configured by a guide member 52. The guide member 51 and the guide member 52 are disposed in the horizontal direction, and the recording sheet S conveyed through this portion is maintained in a horizontal state.

  The reversing path W4 is bent so as to draw a loop gently from the horizontal direction to the upper side and joins the main transport path W2, and is non-linear. The wall surface that forms the outside of the loop between the conveyance roller pair 45 and the conveyance roller pair 43 is configured by a non-linear portion guide 54.

  As shown in FIG. 2, the non-linear portion guide 54 includes a lower fixed portion 55, a first movable wall 56, and a vertical fixed portion 58. The lower fixing portion 55 is disposed in the horizontal direction on the conveying roller pair 45 side. The vertical fixing portion 58 is arranged in the vertical direction on the side of the conveying roller pair 43.

  The first movable wall 56 is disposed between the lower fixed portion 55 and the vertical fixed portion 58. The first movable wall 56 includes a loop portion 56A and a bearing portion 56B. The loop portion 56A is arranged along the inversion path W4 and constitutes a part of the inversion path W4. The bearing portion 56 </ b> B is configured integrally with the loop portion 56 </ b> A, is formed outside the one end side of the loop portion 56 </ b> A, and receives the first shaft 57. The first shaft 57 is arranged in a direction parallel to the transport roller pair 45. The first movable wall 56 is rotatable about the first shaft 57.

  The second delivery path W3 is bent upward from the pickup roller 44 to the conveying roller pair 43 in a gentle manner from the horizontal direction, and merges with the inversion path W4. The lower wall of the horizontal portion of the second delivery path W3 is constituted by a guide plate 68.

  The wall that forms the outer side of the bending of the second delivery path W <b> 3 is configured by the second movable wall 60. The second movable wall 60 includes a guide part 62, a bearing part 64, and a horizontal support part 66. The guide part 62 is disposed along the second delivery path W3 and constitutes a part of the second delivery path W3. The bearing portion 64 is configured integrally with the guide portion 62, is formed on the outer side on one end side of the guide portion 62, and receives the second shaft 65. The second shaft 65 is disposed in a direction parallel to the conveyance roller pair 43. The horizontal support portion 66 is formed at the end of the second movable wall 60 on the side of the conveyance roller pair 43. The horizontal support portion 66 projects outward from the guide portion 62, and is configured such that when the second movable wall 60 is disposed at a horizontal position P2 described later, the upper surface is disposed in the horizontal direction. The second movable wall 60 is rotatable about the second shaft 65.

  A wall driving member 70 is attached to the first movable wall 56 and the second movable wall 60. The wall driving member 70 includes a first arm 71, a second arm 72, a third arm 73, and a clutch 74. The clutch 74 is an electric clutch that can control transmission of driving force. The clutch 74 is attached to the rotation shaft 45 </ b> A of the transport roller pair 45.

  One end of the first arm 71 is attached to the clutch 74 and the other end is attached to one end of the second arm 72 so as to be relatively rotatable. The other end of the second arm 72 is attached to one end of the third arm 73 and the loop portion 56A by a pin 72A. The second arm 72, the third arm 73, and the loop portion 56A are capable of relative rotation about the pin 72A. An elongated hole 73 </ b> B is formed at the other end of the third arm 73. A pin 73A is inserted into the elongated hole 73B, and the other end of the third arm 73 is attached to the guide portion 62A via the elongated hole 73B so as to be relatively rotatable with respect to the guide portion 62A.

  When the recording sheet S travels in the reverse path W4 from the transport roller pair 41 to the transport roller pair 45 (when transported in the reverse direction Y (during reverse transport), the transport roller pair 45 rotates in the X direction. As a result, the first arm 71 rotates in the same direction and is pushed by the second arm 72 and the third arm 73, so that the first movable wall 56 and the second movable wall 60 become the first shaft 57 and the second shaft 65, respectively. 2A is arranged from the transport position P1 shown in Fig. 2A to the horizontal position P2 shown in Fig. 2B, where the upper surface of the loop portion 56A of the first movable wall 56 is The height is set to be the same as or slightly lower than the upper surface of the lower fixed portion 55, and further rotation of the first movable wall 56 is restricted by a restriction member (not shown). At P2, the horizontal support 66 of the second movable wall 60 Surface also is set to be the same height or slightly lower level as the upper surface of the lower fixing portion 55, which further rotation of the second movable wall 60 is regulated by the regulating member (not shown).

  As described above, when the first movable wall 56 and the second movable wall 60 are moved to the horizontal position P2, a part of the non-linear portion guide 54 constituting the reversing path W4 is opened and reversed from the image forming position P. The horizontal distance extending toward the path W4 is extended. The distance after the extension is set so that the length from the discharge port 12A to the outer end of the horizontal support portion 66 is equal to or longer than the maximum size of the recording sheet S that can be printed by the inkjet printer 10 of the present embodiment. Has been.

  During double-sided printing, the recording sheet S on which image formation on one side has been completed is stored between the discharge port 12A and the outer end of the horizontal support member 66, and waits for drying.

  A control panel 32 is provided on the upper left side of the housing 12 in FIG. Various information relating to image formation is displayed on the control panel 32.

  A double-sided printing lamp 34 is provided on the upper surface of the housing 12. The double-sided printing lamp 34 is turned on after the double-sided printing is executed by the inkjet printer 10 and the image formation on one side of the recording sheet S is completed, but before the image formation on the other side is started.

  FIG. 3 shows a schematic block diagram of the control system of the ink jet printer 10. The inkjet printer 10 has a control unit 53 for controlling the entire apparatus. Image data for image formation is input to the control unit 53 from an external device or the like. The control unit 53 includes a CPU, ROM, RAM, and the like. The control unit 53 is connected to the control panel 32, the recording head drive unit 31, the duplex printing in progress lamp 34, the roller drive unit 49, and the clutch 74.

  The recording head drive unit 31 is connected to the recording head 30 and performs control related to driving of the recording head 30 and ink ejection from the recording head 30. The roller drive unit 49 is connected to the pickup rollers 40 and 44, the conveyance roller pairs 41 to 43 and 45, and the discharge roller pair 46. The roller driving unit 49 controls the rotation of each roller.

  Next, a double-sided printing operation in the inkjet printer 10 having the above configuration will be described.

  When image data for double-sided printing is input from an external device (not shown) to the control unit 53 of the inkjet printer 10, the double-sided printing process shown in FIG. 4 is executed.

  In step S <b> 10, the recording sheet S is conveyed from the paper feed tray 14 or the paper feed cassette 16 toward the image forming position P based on the drive signal from the roller drive unit 49. Then, the recording sheet S is disposed at the image forming position P. When paper is fed from the paper feed tray 14, the recording sheet S reaches the image forming position P through the first delivery path W1 and the main transport path W2. When paper is fed from the paper feed cassette 16, the recording sheet S reaches the image forming position P through the second delivery path W3 and the main transport path W2.

  In step S12, image formation on one side of the recording sheet S is started. The image formation on the recording sheet S is performed by ejecting ink based on the image data while scanning the recording head 30 while conveying the recording sheet S outward from the discharge port 12A.

  In step S14, the process waits until image formation on one side of the recording sheet S is completed. Here, the image formation on the recording sheet S is performed while feeding the leading end of the recording sheet S outward from the discharge port 12A. When the image formation on one side of the recording sheet S is completed, the recording sheet S is placed on the discharge tray 20 in a state of protruding outward from the discharge port 12A as shown in FIG. The

  If it is determined in step S14 that the image formation on one side of the recording sheet S has been completed, the recording sheet S is conveyed in the reverse direction (Y direction) in step S15, and the end portion is discharged from the discharge port 12A. It arrange | positions in the position (storage position D2, refer FIG.5 (B)) which does not protrude. At this time, the conveyance roller pair 45 rotates in the X direction, and the first movable wall 56 and the second movable wall 60 are moved from the conveyance position P1 to the horizontal position P2 by the wall driving member 70. The recording sheet S is dried at the storage position D2. The front end of the recording sheet S in the Y direction is placed on the horizontal support member 66 and arranged in the horizontal direction.

  In step S16, the double-sided printing lamp 34 is turned on, and in step S18, the expected time until the start of image formation on the other side of the recording sheet S is displayed on the control panel 32. The “expected time to start image formation on the other side of the recording sheet S” here corresponds to the time required for drying the recording sheet S (drying time), and the amount of ink ejected to the recording sheet S , Determined by density and the like.

  In step S20, the process waits until the drying time elapses. When the drying time elapses, the duplex printing in progress lamp 34 is turned off in step S22, and in step S24, “expected time until image formation starts on the other side of the recording sheet S”. Clear the display.

  In step S25, the conveyance roller pair 45 is rotated in the direction opposite to the X direction, and the recording sheet S is moved to a position where the leading end portion of the recording sheet S returns to the reverse path W4 (return position D3, see FIG. 6A). To return. Thereby, the wall drive member 70 returns to the original position, and the first movable wall 56 and the second movable wall 60 return from the horizontal position P2 to the transport position P1.

  In step S26, the front / back reversal conveyance is performed. In the front / back reverse conveyance, the clutch 74 is turned off so that the driving force is not transmitted to the wall driving member 70 by the rotation of the conveyance roller pair 45 in the X direction. The recording sheet S is conveyed from the return position D3 shown in FIG. 6 (A) to the reversing path W4 via the discharge path W5 and the main conveying path W2 by the front / back reversal conveyance (see FIG. 6 (B)). It joins with the delivery path W3 to draw a loop, returns to the main transport path W2, and reaches the image forming position P through the main transport path W2.

  In step S28, an image is formed on the other side of the recording sheet S. In the image formation on the other side, as in the image formation on the one side, the recording sheet S is transported outward from the discharge port 12A and the recording head 30 is scanned to eject ink based on the image data. Done.

  Thereafter, in step S30, the recording sheet S is discharged to the discharge tray 20, and the present process ends.

  According to the present embodiment, at the time of double-sided printing, after the image formation on one side is completed, the recording sheet S is disposed so as to protrude outside the housing 12, but is immediately conveyed to the storage position D <b> 2 in the housing 12. Since the drying time is waited at this position, it is possible to prevent the user from removing the recording sheet S that is waiting for drying.

  In this embodiment, since the recording sheet S is dried in a state where it is arranged in the horizontal direction, it is possible to prevent the image formation completion surface from coming into contact with a guide or the like of the conveyance path while the recording sheet S is waiting to be dried. .

  Further, since the double-sided printing lamp 34 is turned on during the drying standby, it is possible to make the user recognize that the user is waiting for the drying during double-sided printing.

  In addition, since the “expected time until the start of image formation on the other side of the recording sheet S” is displayed on the control panel 32, the user can recognize the standby time.

  In the present embodiment, the configuration having the double-sided printing lamp 34 has been described. However, the double-sided printing lamp 34 is not essential to the present invention, and may be configured without the double-sided printing lamp 34.

  Further, the display of “expected time until the start of image formation on the other side of the recording sheet S” on the control panel 32 is not essential to the present invention, and such display may not be performed.

  In the present embodiment, the leading edge of the recording sheet S is configured not to protrude from the discharge port 12A. However, when the size of the housing 12 is small and a sufficient horizontal distance cannot be secured, as shown in FIG. The cover 13 may be provided above the discharge port 12A. The cover 13 can cover the recording sheet S waiting for drying and prevent removal by the user.

  In this embodiment, the first movable wall 56 and the second movable wall 60 that are part of the non-linear portion guide 54 of the reversing path W4 are retracted to extend the horizontal portion of the reversing path W4. There is no need to retreat to a horizontal position, and the image forming completion surface of the recording sheet S may be retreated to the outside so as not to contact the inner wall of the conveyance path.

  Further, as shown in FIG. 8, a blower 80 for blowing air toward the recording sheet S waiting for drying may be provided in the housing 12. The blower 80 includes a fan 82 and an air passage 84 that guides the wind from the fan 82. The outlet 84A of the air passage 84 through which the wind is sent out is arranged so as to be blown from the image forming position P to the main conveyance path W2 on the upstream side. By providing the blower 80, the drying time can be shortened.

  When drying is performed using the blower 80, the nozzle surface is covered with a maintenance cap 86 in order to avoid drying the nozzle surface of the recording head 30.

  In the present embodiment, the first movable wall 56 and the second movable wall 60 that are part of the non-linear portion guide 54 of the reversing path W4 are movable. However, as shown in FIG. A fixed guide member 79 is disposed instead of the first movable wall 56 and the second movable wall 60, and the leading end (discharge port 12A side) of the recording sheet S is stored in the housing 12 from the discharge port 12A. Then, it may be dried at the storage position D4.

  In this embodiment, an ink jet printer using ink as an image forming apparatus has been described as an example. However, the present invention is not limited to an ink jet printer, and image formation is performed by using liquid toner or other liquid. It can also be applied to a device.

1 is a schematic overall configuration diagram of an image forming apparatus according to an embodiment. FIG. 3 is an enlarged view of the vicinity of a first movable wall and a second movable wall of the image forming apparatus according to the present embodiment. It is a schematic block diagram of the control system of the image forming apparatus of this embodiment. It is a flowchart of the double-sided printing process of this embodiment. It is a figure explaining the conveyance path | route of a recording sheet in the double-sided printing process of this embodiment. It is a figure explaining the conveyance path | route of a recording sheet in the double-sided printing process of this embodiment. It is a schematic whole block diagram of the image forming apparatus which concerns on the modification of this embodiment. It is a schematic whole block diagram of the image forming apparatus which concerns on the other modification of this embodiment. It is a schematic whole block diagram of the image forming apparatus which concerns on the other modification of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inkjet printer 12A Outlet 12 Housing | casing 14 Paper feed tray 16 Paper feed cassette 30 Recording head 32 Control panel 34 Duplex printing in progress lamp 53 Control part 54 Nonlinear part guide 56 1st movable wall 60 2nd movable wall 66 Horizontal support part 70 Wall drive member 80 Blower P Image forming position P1 Conveying position P2 Horizontal position S Recording sheet W2 Main conveying path W4 Reversing path W5 Discharging path

Claims (7)

An image forming apparatus in which at least a part of the recording medium is disposed outside the housing after the end of image formation on one side of the recording medium and before the start of image formation on the other side during duplex printing,
A recording head that discharges droplets to the recording medium to form an image on the recording medium;
A main conveyance path that is provided in the casing and conveys the recording medium to an image forming position at the recording head; a discharge conveyance path that conveys the recording medium from the image forming position to the outside of the casing through a discharge port; and A conveyance path having a reverse conveyance path for reversing the front and back of the recording medium and conveying the recording medium to the image forming position after image formation on one side;
The non-linear position in the conveyance path is configured to a non-contact position where the surface on the image forming side of the recording medium stored in the housing after the image formation on one side is not in contact with the wall surface of the conveyance path. A movable wall in which a part of the wall of the conveyance path is movable;
An image forming apparatus comprising:   The movable wall is configured to be movable so that an end side of the recording medium after image formation on one surface is far from the discharge port protrudes to the outside of the conveyance path. The image forming apparatus according to claim 1.   The conveyance path includes a horizontal conveyance unit that extends in a horizontal direction including the image forming position, and the movable wall is movable so as to extend a horizontal distance continuous from the horizontal conveyance path. The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus.   The image forming apparatus according to claim 3, further comprising a horizontal support member that supports a lower side of the recording medium that protrudes outside the conveyance path in the non-linear portion.   An in-drying display unit that protrudes from the outer surface of the housing and displays that the printer is waiting for drying after the end of image formation on one side of the recording medium and before the start of image formation on the other side during double-sided printing The image forming apparatus according to claim 1, further comprising:   6. The apparatus according to claim 1, further comprising a standby time display unit that displays a standby time from the end of image formation on one side of the recording medium to the start of image formation on the other side during duplex printing. The image forming apparatus described. An image forming apparatus in which at least a part of the recording medium is disposed outside the housing after the end of image formation on one side of the recording medium and before the start of image formation on the other side during duplex printing,
A recording head that discharges droplets to the recording medium to form an image on the recording medium;
A main conveyance path that is provided in the casing and conveys the recording medium to an image forming position at the recording head; a discharge conveyance path that conveys the recording medium from the image forming position to the outside of the casing through a discharge port; and A conveyance path having a reverse conveyance path for reversing the front and back of the recording medium and conveying the recording medium to the image forming position after image formation on one side;
A storage and drying means for storing the recording medium in the housing and drying it after the image formation on one side of the recording medium is completed;
An image forming apparatus comprising:

Images