JP2006297805A - Image recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image recording apparatus which can record a good image on the whole surface by preventing the occurrence of the unevenness of an image at a front end and a rear end, without causing a decrease in throughput. <P>SOLUTION: This recording apparatus comprises: a roller for carrying a recording sheet and a carriage equipped with a recording head; a platen which is equipped with an absorber for absorbing ink protruding from the recording sheet; and an auxiliary guide (front-end auxiliary guide) which is provided on the upstream side with respect to the recording head in the carrying direction (sub-scanning direction) of a material subject to recording. The platen is provided with an auxiliary guide (rear-end auxiliary guide) which is positioned on the downstream side with respect to the recording head in the carrying direction (sub-scanning direction) of the material subject to recording. The front-end auxiliary guide and the rear-end auxiliary guide have a latch mechanism which can independently move in the sub-scanning direction, and which enables the front-end auxiliary guide and the rear-end auxiliary guide to be connected to/disconnected from each other. When moving to the downstream side, the front-end auxiliary guide is connected to the rear-end auxiliary guide. When returning to a prescribed position on the upstream side, the front-end auxiliary guide is disconnected from the rear-end auxiliary guide. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image recording apparatus for recording on a recording sheet by a recording means, and more particularly to an ink jet recording apparatus capable of recording an image on the entire surface of a recording sheet.

  Conventionally, when recording is performed on the entire surface of a recording sheet, there has been a problem that the ink protruding from the edge of the recording sheet contaminates the inside of the recording apparatus, or the ink adheres to the back surface of the recording sheet. Accordingly, a platen has been proposed in which a surface facing the recording head is cut away and an absorber for absorbing ink protruding from the recording sheet is provided.

  Further, there has been proposed a platen provided with a shielding member so that the recording sheet does not fall in the absorber portion of the platen.

  Further, in order to reduce the area of the notch portion of the platen, a method has been proposed in which the number of print nozzles of the recording head is limited when printing at the leading end and the trailing end.

  FIG. 11 is a cross-sectional view of a platen that performs front-end and rear-end printing by limiting the number of print nozzles to half.

  The carriage P10 on which the recording head P11 is mounted scans in the direction perpendicular to the paper surface while being guided by the main shaft P12 and the guide shaft P13, and forms an image on the recording sheet C1. The recording sheet C1 is conveyed with high accuracy in the direction of arrow a while being sandwiched between the LF roller P30 and the LF pinch roller P31. Further, the paper is discharged while being guided by a paper discharge guide P35 that is nipped and conveyed by the paper discharge roller P32 and the paper discharge pinch roller P33.

  A portion of the platen P400 facing the recording head P11 is opened, and a platen absorber P61 that absorbs ink protruding from the recording sheet C1 is disposed. At this time, the opening P400a of the platen P400 has an opening width that is half of the number of used nozzles of the recording head P11.

  Therefore, as shown in FIG. 11, when printing the leading edge and trailing edge of the recording sheet C1, only half the number of nozzles of the recording head P11 is used.

  FIG. 12 shows a print processing image when forming images of the front end portion and the rear end portion.

  FIG. 12 is a print image when the number of nozzles is 256 and the number of nozzles at the front and rear ends is limited to 128, which is half, in a setting in which eight-pass printing is performed.

  12A to 12C are print processing images when leading edge printing is performed, and the range A is 128 nozzles, which is half of 256 nozzles in the state of printing out at the leading edge printing (when leading edge printing in FIG. 11). This is a print data image when only 16 passes are used and the B range is the state in which the print data is returned to 8 passes when switching from 16 passes to 8 passes, and the C range is a steady 8 This is a print data image with pass feed.

  In addition, C to E are print processing images when rear end printing is performed, the C range is a print data image in a steady 8-pass feed, and the D range is print data when switching from 8 passes to 16 passes. The image and E range are print data images when 16-pass feed is performed using only 128 nozzles, which is half of 256 nozzles, in the state of being printed out at the time of rear end printing (at the time of rear end printing in FIG. 11). It is.

  When the platen opening is limited in this way, it is essential to print by limiting the number of print nozzles of the recording head. In order to prevent image quality deterioration at the front and rear ends, the number of recording passes must be reduced. It is necessary to increase and cope.

JP-A-2001-30481 (FIGS. 11 and 12, claims 6 and 7)

  However, since the platen of the conventional ink jet recording apparatus is notched more than the nozzle width of the recording head, the distance to the recording head changes at the leading end portion and the trailing end portion of the recording sheet. There was a problem that image defects occurred.

  Further, even when a shielding member is provided in the absorber portion, there is a problem that when the rear end is printed, the protruding ink adheres to the shielding member, and the adhered ink stains the back surface of the recording sheet.

  Furthermore, even when the printing nozzle of the recording head is limited and the notch portion of the platen is reduced, as described above, it is necessary to form an image by increasing the number of passes to prevent image quality deterioration. There has been a problem that the printing speed at the time of printing at the rear end is reduced, resulting in a reduction in throughput.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to record a good image on the entire surface by preventing the occurrence of image unevenness at the front and rear ends without causing a decrease in throughput. An object of the present invention is to provide an image recording apparatus capable of performing the above.

  In order to achieve the above object, the present invention provides a carriage mounted with a recording head for ejecting ink onto a recording sheet to form an image, a roller for conveying the recording sheet, and a recording sheet facing the recording head. And a platen equipped with an absorber for absorbing ink protruding from the recording sheet, and an auxiliary guide (hereinafter referred to as “tip”) upstream of the recording head in the recording material conveyance direction (sub-scanning direction). In a recording apparatus having an “auxiliary guide”), the platen is referred to as an auxiliary guide (hereinafter referred to as a “rear end auxiliary guide”) downstream of the recording head in the recording material conveyance direction (sub-scanning direction). ), The front end auxiliary guide and the rear end auxiliary guide are independently movable in the sub-scanning direction, and have a latch mechanism that can be connected to and released from each other. De is connected to the rear end auxiliary guide when moved to the downstream side, when the tip auxiliary guide has returned to a predetermined position on the upstream side, characterized in that the coupling is configured to be released.

  According to the present invention, auxiliary guides are provided on the upstream and downstream sides of the recording head, and the drive of the LF roller is transmitted to the auxiliary guide on the upstream side by a lever that is rotated by the recording sheet, while synchronizing with the recording sheet. By moving the recording sheet at a position shifted from the leading edge of the recording sheet, the leading edge does not drop and image unevenness does not occur. Similarly, the auxiliary guide on the downstream side also moves synchronously at a position deviated from the rear end of the recording sheet by driving transmission of the paper discharge roller, so that the rear end portion does not drop and image unevenness does not occur.

  In addition, there is no need to limit the nozzles used in the recording head, and there is no need to increase the number of passes during leading edge printing and trailing edge printing, and the printing time can be shortened.

  Therefore, according to the present invention, it is possible to obtain an image recording apparatus capable of recording a good image on the entire surface by preventing occurrence of image unevenness at the front and rear ends without causing a reduction in throughput.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<Embodiment 1>
FIG. 1 is an external perspective view in which a universal cassette C10 is mounted on an ink jet printer main body P1 according to the present invention.

  As shown in FIG. 1, the universal cassette C10 on which the recording sheet C1 is set is guided and mounted in a cassette slot P5 attached to the printer main body P1. The recording sheets C1 are fed one by one by the printer main body P1, conveyed to the platen P6, printed by the carriage P10 on which the recording head is mounted, and discharged in the direction of arrow A.

  FIG. 2 is a main sectional view of the printer body.

  A plurality of recording sheets C1 stacked in the universal cassette C10 are pushed upward by a pressure plate P23 in the printer main body P1 via a cassette middle plate C70 in the universal cassette C10 and are pressed against the pickup roller P20. The pickup roller P20 rotates by driving from an ASF motor (not shown) and is conveyed to the feed roller P21 and the retard roller P22.

  Here, the retard roller P22 rotates in the direction opposite to the conveyance direction of the recording sheet C1, and separates the recording sheet C1 that has been multi-fed into one sheet. The recording sheet C1 is conveyed by the feed roller P21 until it is gripped by the LF roller P30 and the LF pinch roller P31.

  The LF roller P30 is conveyed to the platen P6 with high accuracy by an LF motor (not shown), and forms a print image on the recording sheet C1 by the print head P11 mounted on the carriage P10.

  The carriage P10 is driven by a CR motor (not shown) while being guided by the main shaft P12 and the guide shaft P13, and reciprocates in the direction perpendicular to the cross section of FIG. 2 via the lead screw P14.

  The recording sheet C1 is conveyed with high accuracy by a paper discharge roller P32 and a paper discharge pinch roller P33 configured similarly to the LF roller P30, and is discharged out of the printer P1 while being guided by a paper discharge guide P35.

  A pump P40 for recovering the print head P11 mounted on the carriage P10 is mounted directly below the paper discharge guide P35.

  Next, the overall configuration of the platen of the present invention will be described with reference to FIGS.

  FIG. 3 is a perspective view of the proposed platen. 4 to 9 are cross-sectional views showing the operating state of the proposed platen.

  In FIG. 3, the carriage P10 on which the recording head P11 is mounted scans in the direction of the arrow c (main scanning direction) while being guided by the main shaft P12 and the guide shaft P13. The recording sheet C1 is conveyed with high accuracy in the direction of arrow a (sub-scanning direction) while being sandwiched between the LF roller P30 and the LF pinch roller P31. The carriage P10 is scanned in the direction of the arrow c while being conveyed up to the platen P6, and an image is formed on the recording sheet C1 by the recording head P11 mounted on the carriage P10.

  As with the LF roller P30, the recording sheet C1 is intermittently fed with high accuracy while being sandwiched between the paper discharge roller P32 and the paper discharge pinch roller P33. When the image formation on the recording sheet C1 is completed, it is discharged in the direction of arrow b while being guided by the paper discharge guide P35.

  Here, the platen P6 has a concave shape facing the recording head P11, and a platen absorber P61 is disposed to absorb ink protruding from the recording sheet C1. In addition, the proposed front end auxiliary guide P7 is disposed on the upstream side of the platen absorber, and the proposed rear end auxiliary guide P8 is disposed on the downstream side. The front end auxiliary guide P7 and the rear end auxiliary guide P8 are set to have the same height with respect to the recording head P11.

  The front end auxiliary guide P7 is configured to be slidable in the direction of the arrow d, and the rear end auxiliary guide P8 is configured to be slidable in the direction of the arrow e.

  The leading edge detection lever P61 is configured to rotate in the direction of arrow f by the leading edge of the recording sheet C1 conveyed by the LF roller P30 between the platen P6 and the paper regulating plate P36, and detects the leading edge of the recording sheet C1. And a trigger function for connecting the driving of the LF roller P30 to the auxiliary tip guide P7.

  Next, the operation of the proposed front end auxiliary guide P7 and rear end auxiliary guide P8 will be described with reference to FIGS.

  FIG. 4 is a cross-sectional view of the platen in the standby state.

  The tip auxiliary guide P7 is always urged in the j direction in the state illustrated by the tip auxiliary guide spring P73. The front end auxiliary guide P7 has a latch portion P7a configured to engage with the latch portion P8a of the rear end auxiliary guide P8, and further, a front end auxiliary guide rack portion P7b meshing with the front end auxiliary guide pinion gear P71. have.

  The tip detection lever P9 is rotatable in the directions of arrows r1 and r2 around the rotation center of the tip auxiliary guide pinion gear P71. Further, an LF roller drive transmission gear P72 that meshes with the tip auxiliary guide pinion gear P71 is attached to the tip detection lever P9.

  Here, in the LF roller drive transmission gear P72, when the tip detection lever P9 rotates in the direction of the arrow r2, a rubber roller portion (not shown) formed integrally with the LF roller drive transmission gear P72 comes into contact with the LF roller P30. The driving of the LF roller P30 is transmitted to the pinion gear P71 via the drive transmission gear P72, and the tip auxiliary guide P7 is further moved in the direction of the arrow k by the rack P7b. Further, when the leading edge detection lever P9 is rotated in the direction of the arrow p, the leading edge detection sensor P91 detects the rotation of the lever and detects the leading edge of the recording sheet.

  The rear end auxiliary guide P8 includes a latch portion P8a configured to engage with the latch portion of the front end auxiliary guide P7, and further includes a rear end auxiliary guide rack portion P81b that meshes with the rear end auxiliary guide pinion gear P81. Have.

  The paper discharge roller drive transmission gear P82 that meshes with the rear end auxiliary guide pinion gear P81 is held by the rear end auxiliary guide gear holder P83, and rotates in the directions of arrows s1 and s2 with the pinion gear P81 as the rotation center. It is configured. The rear end auxiliary guide gear holder P83 is always urged in the arrow S1 direction by the rear end auxiliary guide gear holder spring P84.

  When the rear end auxiliary gear holder P83 rotates in the arrow s1 direction, a rubber roller portion (not shown) formed integrally with the paper discharge roller drive transmission gear P82 contacts the paper discharge roller P32, and the drive of the paper discharge roller P32 is driven. The auxiliary guide P8 is transmitted to the pinion gear P81 via the transmission gear P82 and further moved in the direction of arrow n by the rack P8b.

  In the standby state in FIG. 4, the rear end auxiliary guide gear holder P83 is pushed in the s2 direction by the convex portion P8c provided on the rear end auxiliary guide P8, so that the drive of the paper discharge roller P32 is transferred to the drive transmission gear P82. It is arranged so as not to be transmitted. The rear end auxiliary guide stopper P62 functions as a stopper when the rear end auxiliary guide P8 moves in the m direction.

  FIG. 5 is a cross-sectional view of the platen when the leading edge of the recording sheet rotates the leading edge detection lever.

  When the recording sheet C1 is conveyed in the direction of the arrow a while being held between the LF roller P30 and the LF pinch roller P31 and the leading edge of the recording sheet C1 comes into contact with the leading edge detection lever P9, the lever P9 is rotated at the rotation center of the leading edge auxiliary guide pinion gear P71. Rotates in the direction of arrow r2.

  At this time, a rubber roller portion (not shown) formed integrally with the LF roller drive transmission gear P72 comes into contact with the LF roller P30, and when the LF roller P30 rotates in the direction of the arrow p1, the drive transmission gear P72 rotates in the direction of the arrow p2. The pinion gear P71 rotates in the arrow p3 direction, and the tip auxiliary guide P7 moves in the arrow k direction by the rack P7b. At this time, the front end detection sensor P91 can detect a part of the front end detection lever P9 and detect the front end of the recording sheet C1.

  As described with reference to FIG. 4, the rear end auxiliary guide P <b> 8 remains in the same position as that in FIG. 4 because the driving of the paper discharge roller P <b> 32 is not transmitted.

  FIG. 6 is a cross-sectional view of the platen when the leading end of the recording sheet is printed.

  When the recording sheet C1 is conveyed onto the recording head P11, the carriage P10 scans in the main scanning direction (direction perpendicular to the paper surface), and the leading end is printed. At this time, the ink protruding from the recording sheet C1 is absorbed by the platen absorber P61.

  At this time, the front end portion P7c of the front end auxiliary guide P7 guides the recording sheet C1 at a position offset to the upstream side of the front end portion of the recording sheet C1, and the protruding ink is transferred to the transport surface of the front end auxiliary guide P7. There is no adhesion.

  Since the leading end auxiliary guide P7 moves in the direction of the arrow k in synchronization with the recording sheet C1, the leading end guide P7 always guides the recording sheet C1, and the leading end of the recording sheet C1 does not bend downward even on the absorber P61. Since a constant interval can be maintained with respect to the recording head P11, printing unevenness does not occur, and printing is performed using all the nozzles of the recording head P11, so that throughput is not reduced.

  FIG. 7 is a cross-sectional view of the platen in a state where the front end auxiliary guide is connected to the rear end auxiliary guide.

  When the tip auxiliary guide P7 moves further in the direction of the arrow a from FIG. 6, the tip guide latch portion P7a and the rear end guide latch portion P8a are connected as shown in FIG. In this state, the front end auxiliary guide P7 is regulated by the rear end auxiliary guide P8, and therefore does not move in the arrow k direction.

  FIG. 8 is a cross-sectional view of the platen with the trailing edge of the recording sheet detached from the leading edge detection lever.

  When the recording sheet C1 is conveyed in the direction of the arrow a, the trailing end of the recording sheet is released from the leading edge detection lever P9. At this time, the tip detection lever P9 rotates in the arrow r1 direction.

  In this state, the drive connection between the LF roller P30 and the LF roller drive transmission gear P72 is released, the driving force for moving the tip auxiliary guide P7 in the direction of the arrow k is transmitted, and the tip auxiliary guide spring P73 returns it to the j direction. . At this time, as shown in FIG. 7, since the front end auxiliary guide P7 and the rear end auxiliary guide P8 are connected by the latch, the rear end auxiliary guide P8 is similarly moved in the direction of the arrow j. When the rear end auxiliary guide P8 moves in the direction of arrow j, the movement is stopped by the rear end auxiliary guide stopper provided with the platen P6, and at the same time, the connection between the front end auxiliary guide latch portion P7a and the rear end auxiliary guide latch portion P8a is released. The In this state, the rear end auxiliary guide rear end portion P8d is offset to the downstream side of the recording sheet C1.

  At this time, the rear end auxiliary guide convex portion P8c is detached from the rear end auxiliary guide holder P83, so that the rear end auxiliary guide holder P83 rotates in the direction of the arrow s1 around the rear end auxiliary guide pinion gear P81. A rubber roller portion (not shown) formed integrally with the paper discharge roller drive transmission gear P82 contacts the paper discharge roller P32, the rotation of the arrow q1 of the paper discharge roller P32 is transmitted, and the paper discharge roller drive transmission gear P82 is an arrow. The rear end auxiliary guide pinion gear P81 rotates in the direction q2, the rear end auxiliary guide rack portion P8b starts moving the rear end auxiliary guide P8 in the arrow n direction.

  FIG. 9 is a cross-sectional view of the platen when printing the trailing edge of the recording sheet.

  The ink protruding from the rear end of the recording sheet C1 is absorbed by the platen absorber P61.

  At this time, the rear end portion P8c of the front end auxiliary guide P8 guides the recording sheet C1 at a position offset to the downstream side of the rear end portion of the recording sheet C1, and the protruding ink is in the rear end auxiliary guide P8. It does not adhere to the transport surface.

  Since the rear end auxiliary guide P8 moves in the direction of the arrow n in synchronization with the recording sheet C1, it always guides the recording sheet C1, and the rear end of the recording sheet C1 may be bent downward also on the absorber P61. In addition, since a constant interval can be maintained with respect to the recording head P11, printing unevenness does not occur, and printing is performed using all the nozzles of the recording head P11, so that the throughput is not reduced.

  With the configuration as described above, when performing borderless printing on the recording sheet, the leading edge and trailing edge of the recording sheet are guided by the platen P6, the leading edge auxiliary guide P7, and the trailing edge auxiliary guide P8 over the entire surface. There is no change between the recording head and the recording sheet, and good image quality can be guaranteed over the entire surface.

  In addition, since there is no need to limit the nozzles used at the front and rear ends, it is possible to realize good printing without degradation of throughput.

<Embodiment 2>
The structure of the platen according to this embodiment will be described with reference to the cross-sectional view of FIG.

  FIG. 10 is a cross-sectional view of the platen according to the present embodiment.

  A tip auxiliary guide pinion gear P101 having a rubber roller attached to one end of the tip detection lever P300 is arranged. When the recording sheet rotates the tip detection lever, the tip detection lever P300 rotates in the direction of the arrow r2, and the tip auxiliary guide pinion gear. P101 is brought into mesh with the rack portion P100b of the front end auxiliary guide P100. At this time, the rubber roller portion formed integrally with the front end auxiliary guide pinion gear P101 protrudes from the platen P6 to the upper surface, and the recording sheet C1. It will be in the state which contacts.

  When the recording sheet C1 is conveyed in the arrow a direction by the LF roller P30, the pinion gear P101 rotates in the arrow t1 direction, and the leading end auxiliary guide P100 moves in the k direction by the meshed rack portion P100b.

  The rack portion P200b of the rear end auxiliary guide P201 always meshes with the rear end auxiliary guide pinion gear P201. When the recording sheet C1 is conveyed onto the rear end auxiliary guide pinion gear P201, it contacts a rubber roller portion P201a formed integrally with the rear end auxiliary guide pinion gear P201 disposed so as to protrude above the platen P6. When the recording sheet C1 is conveyed in the direction of the arrow a by the LF roller P30, the pinion gear P201 rotates in the direction of the arrow t2, and the rear end auxiliary guide P200 moves in the n direction by the meshed rack portion P200b.

  Here, the configuration in which the front end auxiliary guide P100 and the rear end auxiliary guide P200 are connected or released is the same as in the first embodiment.

  By configuring as described above, the number of parts is less than that in the first embodiment, and a low-cost configuration does not cause a decrease in throughput, and a good image can be realized on the entire recording sheet.

1 is a perspective view of a printer main body of the present invention. 1 is a main cross-sectional view of a printer main body of the present invention. It is a perspective view of the platen concerning Embodiment 1 of the present invention. It is platen sectional drawing which concerns on Embodiment 1 of this invention (standby state). FIG. 6 is a cross-sectional view of the platen in a state where the leading edge of the recording sheet rotates the leading edge detection lever. It is platen sectional drawing at the time of front-end | tip printing. It is a platen sectional view in the state where a tip auxiliary guide was connected with a rear end auxiliary guide. FIG. 5 is a cross-sectional view of the platen in a state where the rear end of the recording sheet is detached from the front end detection lever. It is a platen sectional view at the time of rear end printing. It is platen sectional drawing of Embodiment 2 of this invention. It is sectional drawing of the platen part which restrict | limits the conventional nozzle and performs front-end | tip and back end printing. It is a print processing image of a front end and a rear end when a conventional nozzle is limited.

Explanation of symbols

P1 printer main body P5 cassette slot P6 platen P7 tip auxiliary guide P7a tip auxiliary guide latch portion P7b tip auxiliary guide rack portion P7c tip auxiliary guide tip portion P8 rear end auxiliary guide P8a rear end auxiliary guide latch portion P8b rear end auxiliary guide rack portion P8c Rear end auxiliary guide convex portion P8d Rear end auxiliary guide rear end portion P9 Front end detection lever P10 Carriage P11 Print head portion P12 Main shaft P13 Guide shaft P14 Lead screw P20 Pickup roller P21 Feed roller P22 Retard roller P23 Pressure plate P30 LF roller
P31 LF pinch roller P32 Paper discharge roller P33 Paper discharge pinch roller P35 Paper discharge guide P36 Paper restriction plate P40 Pump P61 Platen absorber P62 Rear end auxiliary guide stopper P71 Front end auxiliary guide pinion gear P72 LF roller drive transmission gear P73 Front end auxiliary guide spring P81 Rear end auxiliary guide pinion gear P82 Paper discharge roller drive transmission gear P83 Rear end auxiliary guide gear holder P84 Rear end auxiliary guide gear holder spring P91 Front end detection sensor P100 Front end auxiliary guide P100b Front end auxiliary guide rack P101 Front end auxiliary guide pinion Gear (with roller)
P101a Rubber roller portion of the tip auxiliary guide pinion gear P200 Rear end auxiliary guide P200b Rear end auxiliary guide rack portion P201 Rear end auxiliary guide pinion gear (with roller)
P201a Rubber roller part of rear end auxiliary guide pinion gear P300 Front end detection lever C1 Recording sheet C10 Universal cassette C70 Cassette middle plate

Claims (8)

A carriage equipped with a recording head for ejecting ink onto a recording sheet to form an image, a roller for conveying the recording sheet, and holding the recording sheet facing the recording head and absorbing ink protruding from the recording sheet And a recording apparatus having an auxiliary guide (hereinafter referred to as a “leading auxiliary guide”) upstream of the recording head with respect to the recording material conveyance direction (sub-scanning direction). In
The platen has an auxiliary guide (hereinafter referred to as “rear end auxiliary guide”) on the downstream side of the recording head with respect to the recording material conveyance direction (sub-scanning direction), and the front end auxiliary guide and the rear end auxiliary The guide is independently movable in the sub-scanning direction, and has a latch mechanism that can be connected to and released from each other. When the front end auxiliary guide moves downstream, the guide is connected to the rear end auxiliary guide, An image recording apparatus characterized in that the connection is released when the tip auxiliary guide returns to a predetermined position on the upstream side.   The image recording apparatus according to claim 1, wherein the auxiliary guide has a surface that is the same as a conveying surface of the platen, and is configured to be movable to a range in which an area of the absorber of the platen can be shielded.   The front end auxiliary guide is configured to be movable in the downstream direction by a mechanism that transmits driving from a conveyance roller (hereinafter referred to as “LF roller”) disposed on the upstream side, and the rear end auxiliary guide The image recording apparatus according to claim 1, wherein the image recording apparatus is configured to be movable in a downstream direction by a mechanism that transmits driving from a conveyance roller (hereinafter referred to as a “sheet discharge roller”) disposed on the side.   The front end auxiliary guide has a lever configured to be rotatable by the recording sheet, and transmits the drive from the LF roller in a state where the lever is rotated by the recording sheet, and the platen absorber. The image recording apparatus according to claim 1, wherein the image recording apparatus is configured to move until the area is shielded.   The image according to claim 1, wherein the lever configured to be rotatable is configured to be able to detect a leading edge of the recording sheet by disposing a sensor that detects rotation of the lever. Recording device.   The front end auxiliary guide is always urged to the upstream side by a spring member. When the rear end of the recording sheet is separated from the lever, the drive transmission from the LF roller is released, and the front end auxiliary guide is moved upstream. The image recording apparatus according to claim 1, wherein the image recording apparatus is configured to return to a predetermined position.   The leading edge auxiliary guide moves in synchronization with the recording sheet at a position shifted upstream from the leading edge of the recording sheet, and the trailing edge auxiliary guide is downstream of the trailing edge of the recording sheet. 2. The image recording apparatus according to claim 1, wherein the image recording apparatus is configured to move in synchronization with the recording sheet at a position shifted to the side.   The image recording apparatus according to claim 1, wherein the recording head includes an electrothermal transducer element that heats and discharges ink onto a surface of the recording sheet.

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