JP2012176625A - Image recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure capable of reducing warping or positional deviation of a roller for conveying the recording medium in a conveying direction of a recording medium.SOLUTION: The image recording apparatus includes: a pinch roller 61 provided at a further upstream side in the conveying direction of a recording sheet than a recording part for recording an image on the recording sheet; a conveyance roller 60 which pinches the recording sheet between itself and the pinch roller 61 and conveys the recording sheet, and which is configured of one roller; a frame 72 for rotatably supporting the conveyance roller 60; a pressing member 80 movable in a front and rear direction 8 with respect to the frame 72 and coming in sliding contact with a roller face of the conveyance roller 60 from the downstream side in the conveying direction; a spring 85 for biasing the pressing member 80 in a direction opposite to the conveying direction; and an intermediate roller pair provided at a further upstream side in the conveying direction than the pinch roller 61 and the conveyance roller 60, and generating a load in the opposite direction with respect to the recording sheet pinched by the pinch roller 61 and the conveyance roller 60.

Description

  The present invention relates to an image recording apparatus that conveys a recording medium along a conveyance path and records an image on the recording medium.

  In an image recording apparatus, a recording medium such as a recording sheet is often conveyed by a pair of rollers. The roller pair is composed of a driving roller that is rotated by driving transmission from a driving source, and a driven roller that rotates by the rotation of the driving roller, and the recording medium is conveyed by being sandwiched between the rotating roller pair. .

  The rollers constituting the roller pair are rotatably supported at both ends in the axial direction (width direction of the recording medium perpendicular to the recording medium conveyance direction) by a frame of the image recording apparatus. That is, the roller is not supported at the central portion in the axial direction. Therefore, the roller is easily bent. If the rollers bend, the roller pair may not be able to clamp the recording medium.

  In order to solve such a problem, Patent Document 1 discloses a document conveying device in which a rib for preventing the deflection of the shaft of the registration roller is provided in an intermediate portion of the shaft of the registration roller.

Japanese Patent Laid-Open No. 10-203893

  However, when the roller is rotatably supported at both ends in the axial direction, the roller not only bends but also may be displaced in the transport direction or in a direction orthogonal to the transport direction and the axial direction.

  For example, another roller pair (hereinafter referred to as a second roller pair) is provided upstream of the roller pair (hereinafter referred to as the first roller pair) in the conveying direction, and recording by the second roller pair is performed. The image recording apparatus is configured so that the recording medium is transported while securing the stretched state between the two roller pairs by making the medium transportation speed slower than the recording medium transportation speed by the first roller pair. In this case, a force is applied to the recording medium in the conveying direction at the moment when the rear end of the recording medium is removed from the second roller pair. As a result, the first roller pair may be displaced in the transport direction or in a direction orthogonal to the transport direction and the axial direction.

  As another example, when a conveyance path on the upstream side in the conveyance direction with respect to the first roller pair is formed in a curved shape, a recording medium having high rigidity such as glossy paper has a curved conveyance path. When transported, the recording medium comes into pressure contact with the outer guide surface that defines the curved transport path. Then, at the moment when the rear end of the recording medium is removed from the curved conveyance path, the state where the recording medium is pressed against the guide surface is eliminated, and a force is applied to the recording medium in the conveyance direction. As a result, the first roller pair may be displaced in the transport direction or in a direction orthogonal to the transport direction and the axial direction.

  In the document conveying device described in Patent Document 1, by providing the rib, the deflection of the roller can be prevented, but the above-described displacement of the roller cannot be prevented.

  The present invention has been made in view of the above problems, and an object of the present invention is to cause a roller for transporting a recording medium to bend in a direction in which the recording medium is transported or in a direction perpendicular to the transport direction and the axial direction. It is an object of the present invention to provide a structure capable of reducing dripping and displacement.

(1) An image recording apparatus according to the present invention includes a recording unit that records an image on a recording medium guided along a conveyance path, and a first roller provided upstream of the recording unit in the conveyance direction of the recording medium. And a second roller that is disposed to face the first roller and rotates by receiving a driving force from a motor, and a conveying unit that conveys a recording medium, and both axial ends of the second roller Provided between the support member having a support portion for rotatably supporting the second roller and the support portion in the axial direction, so that the first roller side of the second roller is exposed. A pressing member that is in sliding contact with the second roller; and a biasing member that biases the pressing member.

(2) The urging member urges the pressing member in a direction from the second roller toward the first roller.

(3) A platen that supports the recording medium conveyed to the recording unit is provided, and the pressing member is a center of the second roller in the axial direction of a passage area of the recording medium conveyed on the platen. Slidably contact the part.

(4) The pressing member is in sliding contact with the central portion of the second roller in the axial direction.

(5) The second roller is ceramic processed on both sides of the central portion in the axial direction.

(6) A metal support member made of metal that supports the urging member is provided.

(7) The pressing member has an abutting portion erected in a direction orthogonal to the conveying direction and the axial direction on the downstream side in the conveying direction of the second roller. The second roller can be slidably contacted from the downstream side in the conveying direction.
(8) The pressing member has an abutting portion erected in a direction orthogonal to the conveying direction and the axial direction on the upstream side in the conveying direction of the second roller. The second roller can be slidably contacted from the upstream side in the conveying direction.

(9) a load member that is provided upstream of the first roller and the second roller in the transport direction and that generates a load on the recording medium sandwiched between the first roller and the second roller; Is provided.

(10) The load member is a third roller and a fourth roller that are provided upstream of the first roller and the second roller in the transport direction in the transport path and can sandwich the recording medium.

(11) The transport path includes a curved path formed in a curved shape on the upstream side in the transport direction with respect to the first roller and the second roller, and the load member is transported along the curved path. A contact guide member that contacts a recording medium, and the contact guide member includes a fixed guide member and a rotation guide member, and an interval is provided between the fixed guide member and the rotation guide member. Exists.

(12) The tray on which the recording medium is placed and the recording medium placed on the tray are more upstream in the conveyance direction than the first roller and the second roller in the conveyance path. A feeding unit that feeds in the feeding direction; and an inclined member that is erected from a downstream position in the feeding direction of the recording medium placed on the tray, and is placed on the tray The recorded medium is fed to the transport path along the inclined member, and the load member is the inclined member.

  In the present invention, it is possible to reduce the second roller for conveying the recording medium from being bent or displaced in the conveying direction of the recording medium or in a direction perpendicular to the conveying direction and the axial direction. Can do.

FIG. 1 is a perspective view of the multifunction machine 10. FIG. 2 is a longitudinal sectional view schematically showing the internal structure of the printer unit 11. FIG. 3 is a perspective view of the frame 72, the transport roller 60, and the pressing member 80. FIG. 4 is a longitudinal sectional view of the frame 72, the conveyance roller 60, and the pressing member 80. FIG. 5 is a perspective view of the pressing member 80 as viewed obliquely from the upper left. FIGS. 6A and 6B are perspective views of the pressing member 80 as viewed obliquely from the lower front left. FIG. 6A shows the state in which the conveying roller 60 is in sliding contact, and FIG. 6B shows the state in which the conveying roller 60 slides. The state where it is not touched is shown. FIGS. 7A and 7B are perspective views of the pressing member 80 as viewed obliquely from the lower left rear. FIG. 7A shows a state in which the conveying roller 60 is in sliding contact, and FIG. The state where it is not touched is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. The embodiment described below is merely an example of the present invention, and it is needless to say that the embodiment of the present invention can be changed as appropriate without departing from the gist of the present invention. In the following description, the vertical direction 7 is defined with reference to a state in which the multifunction machine 10 is installed (the state shown in FIG. 1), and the side where the opening 13 is provided is the front side (front side). 8 is defined, and a left-right direction 9 is defined when the multifunction machine 10 is viewed from the front side (front side). For the paper feed trays 21 and 22, the vertical direction 7, the front-rear direction 8, and the left-right direction 9 are defined with reference to the state of being mounted on the multifunction machine 10 (the state shown in FIG. 1).

[Schematic configuration of MFP 10]
As shown in FIG. 1, the multifunction machine 10 is generally formed in a rectangular parallelepiped, and is provided with a scanner unit 12 in the upper part and an ink jet recording type printer unit 11 (an example of the image recording apparatus of the present invention) in the lower part. Yes. The multifunction machine 10 has various functions such as a facsimile function and a print function. The presence or absence of functions other than the print function is arbitrary.

  An opening 13 is formed on the front side of the printer unit 11. The printer unit 11 includes paper feed trays 21 and 22 (an example of the tray of the present invention) and a recording unit 40 (an example of the recording unit of the present invention, see FIG. 2). The printer unit 11 can insert and remove the paper feed trays 21 and 22 in the front-rear direction 8 through the opening 13.

  As shown in FIG. 2, recording paper 50 (an example of a recording medium of the present invention) is stored in the paper feed trays 21 and 22. In the printer unit 11, the recording paper 50 is selectively supplied from the paper feed tray 21 or the paper feed tray 22 into the printer unit 11. The supplied recording paper 50 is conveyed in a conveying direction in a first conveying path 16 described later, and after an image is recorded by the recording unit 40, it is discharged to a paper discharge tray 23 provided on the upper surface of the paper feed tray 22. . Here, the conveyance direction indicates the direction indicated by a broken line with arrows and a one-dot chain line in FIG.

  As shown in FIGS. 1 and 2, the paper feed tray 21 and the paper feed tray 22 are arranged in two upper and lower stages with the paper feed tray 22 as the upper side. By providing the two paper feed trays 21 and 22, it is possible to hold the recording paper 50 having a different size and paper type.

[First transport path 16]
As shown in FIG. 2, from the upper side of the inclined plates 34 and 24 (an example of the inclined plate of the present invention) of the paper feed trays 21 and 22 to the paper discharge tray 23 via the recording unit 40, the recording paper 50 is loaded. A first conveyance path 16 (an example of a conveyance path of the present invention) for guiding is provided in the printer unit 11. The first conveyance path 16 is a curved path 17 (an example of a curved path according to the present invention, which is formed between the upper side of the inclined plates 34 and 24 of the paper feed trays 21 and 22 and a conveyance roller pair 59 described later. 2), and a discharge path 18 (shown by an alternate long and short dash line in FIG. 2) that is formed in a substantially straight line from the pair of conveying rollers 59 to the discharge tray 23 directly below the recording unit 40. It is composed of).

  The curved path 17 is partitioned by an outer guide member 51 (an example of an outer guide member and a load member of the present invention) and an inner guide member 52 (an example of an inner guide member of the present invention) that face each other with a predetermined interval. .

  The outer guide member 51 includes an outer guide surface 151 (an example of a contact surface according to the present invention) that faces the curved path 17 and continues along the conveyance direction of the recording paper 50. The inner guide member 52 includes an inner guide surface 152 that faces the curved path 17. When the recording paper 50 conveyed through the first conveyance path 16 has high rigidity, the curved path 17 is curved, so that the recording paper 50 is conveyed while being in contact with the outer guide surface 151.

  In the present embodiment, the outer guide member 51 is fixed to the printer unit 11 below the rotation guide member 155 and a rotation guide member 155 that can rotate in the direction of the arrow 154 around the shaft 153. The fixed guide member 156 is formed. Since the rotation guide member 155 and the fixed guide member 156 are separate members, a predetermined interval 157 exists between the members 155 and 156. That is, the outer guide member 51 and the outer guide surface 151 are divided. In the present embodiment, the outer guide member 51 is divided at one location, but the division location is not limited to one location, and may be divided at a plurality of locations.

  The discharge path 18 is opposed to the recording unit 40 and the first guide member 53 provided on the downstream side in the transport direction from the recording unit 40 with a predetermined interval from the recording unit 40 and the first guide member 53. It is partitioned by the second guide member 54.

  Note that the outer guide member 51, the inner guide member 52, the first guide member 53, the second guide member 54, and the third guide member 55 described later are all in the direction perpendicular to the plane of FIG. 2 (the left-right direction 9 in FIG. 1). ).

[Supply units 28 and 38]
When the paper feed tray 22 is attached to the printer unit 11, the inclined plate 24 is disposed below the first conveyance path 16, and the first supply unit 28 (of the feed unit of the present invention) is disposed above the paper feed tray 22. An example) is arranged. The first supply unit 28 includes a paper feed roller 25, an arm 26, and a shaft 27. The paper feed roller 25 is rotatably provided on the tip side of the arm 26. The arm 26 is rotatably provided on a shaft 27 supported by the casing of the printer unit 11. The arm 26 is urged to rotate toward the paper feed tray 22 by its own weight or by receiving an elastic force from a spring or the like. The first supply unit 28 picks up the recording paper 50 from the paper feed tray 22 and feeds it to the curved path 17 via the inclined plate 24. The second supply unit 38 (an example of the feeding unit of the present invention) has the same configuration as the first supply unit 28. That is, the second supply unit 38 includes the paper feed roller 35, the arm 36, and the shaft 37, and picks up the recording paper 50 from the paper feed tray 21 and feeds it to the curved path 17 through the inclined plate 34. .

[Conveying roller pair 59]
As shown in FIG. 2, a conveyance roller pair 59 is provided in the first conveyance path 16 on the upstream side of the recording unit 40 in the conveyance direction of the recording paper 50. The conveyance roller pair 59 includes a conveyance roller 60 (an example of the second roller of the present invention) and a pinch roller 61 (an example of the first roller of the present invention). The transport roller 60 is disposed on the upper side of the first transport path 16 and rotates upon receiving a driving force from a transport motor (not shown). The pinch roller 61 is disposed so as to face the transport roller 60 across the first transport path 16, that is, rotatably below the first transport path 16, and is biased toward the transport roller 60 by a spring. ing. Accordingly, the conveyance roller pair 59 sandwiches the recording paper 50 and conveys the recording sheet 50 toward the recording unit 40 along the first conveyance path 16, that is, downstream in the conveyance direction. The conveyance roller pair 59 will be described in detail later.

[Discharge roller pair 64]
As shown in FIG. 2, a discharge roller pair 64 is provided in the first transport path 16 (discharge path 18) on the downstream side of the recording unit 40 in the transport direction of the recording paper 50. The discharge roller pair 64 includes a discharge roller 62 and a spur 63. The paper discharge roller 62 is disposed below the discharge path 18 and rotates upon receiving a driving force from the transport motor. The spur 63 is rotatably disposed above the paper discharge roller 62 with the discharge path 18 interposed therebetween, and is urged by a spring toward the paper discharge roller 62. As a result, the discharge roller pair 64 sandwiches the recording paper 50 and transports it toward the paper discharge tray 23 along the discharge path 18, that is, downstream in the transport direction.

[Intermediate roller pair 56]
As shown in FIG. 2, an intermediate roller pair 56 (an example of a load member of the present invention) is provided on the upstream side of the first conveyance path 16 (curved path 17) in the conveyance direction of the recording paper 50 with respect to the conveyance roller pair 59. It has been. The intermediate roller pair 56 includes a first intermediate roller 57 (an example of a third roller of the present invention) and a second intermediate roller 58 (an example of a fourth roller of the present invention). The first intermediate roller 57 is disposed outside the curved path 17 and rotates by receiving a driving force from the transport motor. The second intermediate roller 58 is rotatably disposed to face the first intermediate roller 57 with the curved path 17 interposed therebetween, and is biased toward the first intermediate roller 57 by a spring. As a result, the intermediate roller pair 56 sandwiches the recording paper 50 and transports it toward the transport roller pair 59 along the curved path 17, that is, downstream in the transport direction.

  In the present embodiment, the conveyance speed of the recording paper 50 by the intermediate roller pair 56 is configured to be slower than the conveyance speed of the recording paper 50 by the conveyance roller pair 59. For example, the gear ratio of the first intermediate roller 57 is configured to be larger than the gear ratio of the transport roller 60. Thereby, the rotation speed of the first intermediate roller 57 is slower than the rotation speed of the conveyance roller 60, and the conveyance speed of the recording paper 50 by the intermediate roller pair 56 is higher than the conveyance speed of the recording paper 50 by the conveyance roller pair 59. Become slow. As another example, the drive source of the first intermediate roller 57 may be a drive source different from the drive source of the transport roller 60. In this case, the drive sources of the rollers 57 and 60 are selected and controlled so that the rotation speed of the first intermediate roller 57 is slower than the rotation speed of the transport roller 60. With the configuration described above, the recording sheet 50 to be conveyed is stretched between the intermediate roller pair 56 and the conveyance roller pair 59. That is, the intermediate roller pair 56 generates a load in the direction opposite to the conveyance direction with respect to the recording paper 50 sandwiched between the conveyance roller pair 59.

  Note that both the first intermediate roller 57 and the second intermediate roller 58 may be configured not to receive the driving force from the conveyance motor. In this case, the intermediate roller pair 56 simply sandwiches the recording paper 50. Therefore, when the recording paper 50 is sandwiched between both the conveyance roller pair 59 and the intermediate roller pair 56, the vicinity of the front end of the recording paper 50 that is sandwiched by the conveyance roller pair 59 that receives the driving force and rotates is the intermediate roller. The vicinity of the rear end of the recording paper 50 sandwiched by the pair 56 is pulled. That is, even with such a configuration, the recording paper 50 is stretched between the intermediate roller pair 56 and the conveying roller pair 59.

[Recording unit 40]
As shown in FIG. 2, the recording unit 40 includes a carriage 41 that mounts a recording head 42 and reciprocates in the main scanning direction (direction perpendicular to the paper surface of FIG. 2). The recording head 42 is supplied with inks of cyan (C), magenta (M), yellow (Y), and black (Bk) from an ink cartridge (not shown). The recording head 42 ejects each ink as a minute ink droplet from a nozzle provided on the lower surface thereof. As the carriage 41 reciprocates in the main scanning direction, the recording head 42 is scanned with respect to the recording paper 50, and on the platen 43 provided below the recording unit 40 and facing the recording unit 40, the discharge path 18. An image is recorded on the recording paper 50 conveyed along the line. The platen 43 is a member that supports the recording paper 50 conveyed along the discharge path 18 and is supported by the second guide member 54.

  The recording paper 50 fed from the paper feed tray 21 or the paper feed tray 22 to the curved path 17 by the first supply unit 28 or the second supply unit 38 is guided to the recording unit 40 by the intermediate roller pair 56 and the conveyance roller pair 59. Then, an image is recorded by the recording unit 40. Thereafter, the paper is discharged to the paper discharge tray 23 by the discharge roller pair 64.

[Route switching unit 97 and reverse roller pair 65]
As shown in FIG. 2, in order to guide the recording paper 50 positioned on the downstream side in the transport direction in the discharge path 18 relative to the discharge roller pair 64 to the second transport path 90 to be described later, a path is provided to the printer unit 11. A switching unit 97 and a reverse roller pair 65 are provided. The path switching unit 97 is provided downstream of the discharge roller pair 64 in the transport direction.

  The reverse roller pair 65 is provided downstream of the path switching unit 97 in the transport direction. The reverse roller pair 65 includes a drive roller 66 and a spur 67. The driving roller 60 rotates upon receiving a driving force from a transport motor (not shown). The drive roller 66 is configured to be forward / reverse.

  The path switching unit 97 includes a flap 96, a shaft 98, and auxiliary rollers 100 and 101. The flap 96 has a discharge posture (at the posture shown by a solid line in FIG. 2) that allows the recording paper 50 to be discharged to the paper discharge tray 23 along the first conveyance path 16 around the shaft 98, and the second recording paper 50. It is configured to be able to rotate between a reverse posture (a posture indicated by a broken line in FIG. 2) that can be guided to the conveyance path 90.

  Although the path switching unit 97 holds the reverse posture in the normal state, the posture is changed from the reverse posture to the discharge posture by being pushed onto the upper surface of the recording paper 50. Thereafter, when the rear end portion of the recording paper 50 reaches a specified position upstream of the auxiliary roller 101, the posture is changed from the discharge posture to the reverse posture. Accordingly, the rear end portion of the recording paper 50 is pressed downward by the auxiliary roller 101 and directed toward the reverse conveyance path 90.

  When double-sided recording is performed, the drive roller 66 is switched from normal rotation to reverse rotation in a state where the rear end portion of the recording paper 50 is directed toward the reverse conveyance path 90. As a result, the recording paper 50 is switched back and conveyed to the reverse conveyance path 90.

[Second transport path 90]
As shown in FIG. 2, the second transport path 90 is provided in the printer unit 11 of the multifunction machine 10 according to the first modification. The second conveyance path 90 is branched from the discharge path 18 at the branch port 91, and joins the curved path 17 at the junction 92. The recording sheet 50 is conveyed in the refeed direction indicated by a two-dot chain line with an arrow in FIG. The recording paper 50 on which the image is recorded on the front surface by the recording unit 40 is turned upside down by passing through the second conveyance path 90 and is fed to the recording unit 40 again.

  The second conveyance path 90 is provided by the above-described second guide member 54 and the third guide member 55 provided below the second guide member 54 and facing the second guide member 54 with a predetermined interval. It is partitioned.

  The second conveyance path 90 is provided with a retransmission roller pair 68 including a retransmission roller 69 and a pinch roller 70. The retransmission roller pair 68 sandwiches the recording paper 50 and conveys it from the branch port 91 to the junction 92.

[Frame 72]
As shown in FIGS. 3 and 4, the printer unit 11 includes a metal frame 72 (an example of a support member of the present invention) inside the casing. The frame 72 is attached to the casing of the printer unit 11. The frame 72 includes a frame main body 73 and a pair of guide members 76 and 77 attached to the frame main body 73 on the upper side of the frame main body 73.

  The guide members 76 and 77 are disposed on the upper side of the discharge path 18. The guide members 76 and 77 are arranged at a predetermined interval in the conveyance direction of the recording paper 50 and extend in the width direction (left-right direction 9) of the discharge path 18. The recording head 42 described above is held by the carriage 41, and the carriage 41 is supported by the guide members 76 and 77 and is slidable in the width direction of the discharge path 18.

  A pair of long holes 78 extending in the front-rear direction 8 are provided at the center of the guide member 76 in the left-right direction 9. An inclined portion 83 of the pressing member 80 described later is inserted through the long hole 78. A substantially rectangular opening 79 is provided between the pair of long holes 78 of the guide member 76, and a protrusion 89 extending rearward from the front side surface of the opening 79 is provided.

  The transport roller 60 is rotatably supported at both ends in the axial direction (left-right direction 9) by the right side plate 74 and the left side plate 75 of the frame main body 73 provided at the left and right ends of the discharge path 18. The conveyance roller 60 is a cylindrical roller that extends in the left-right direction 9 as an axial direction and is formed of a single piece, and is made of steel. Of the roller surface 160 (corresponding to the roller surface of the present invention) that constitutes the surface of the transport roller 60 and contacts the recording paper 50 transported along the first transport path 16, except for the central portion 161 in the left-right direction 9, Ceramic processing is done. Further, as shown in FIGS. 6A and 7A, the portion slidably contacted by a pressing member 80 described later, that is, the central portion 161 in the left-right direction 9 of the transport roller 60 is subjected to ceramic processing. The steel material is bare.

[Pressing member 80]
As shown in FIGS. 3 and 4, a pressing member 80 (an example of the pressing member of the present invention) is disposed below the guide member 76. As shown in FIGS. 5 to 7, the pressing member 80 includes a main body portion 81 (an example of the main body portion of the present invention), a contact portion 82 (an example of the contact portion of the present invention), and an inclined portion 83 (the present invention). An example of the inclined part) and a fulcrum part 84 (an example of the fulcrum part of the present invention).

  The main body 81 is a substantially rectangular plate-like member, and is disposed below the guide member 76 so as to be long in the front-rear direction 8. The main body 81 includes a flat plate 110 and side plates 111 erected from both ends in the left-right direction 9 of the flat plate 110.

  The inclined portion 83 is erected upward from the upper surface of the main body portion 81, specifically, near the rear end of the side plate 111 of the main body portion 81 and from both ends in the left-right direction 9. The inclined portion 83 is inserted through a long hole 78 provided in the guide member 76. As a result, the protruding end of the inclined portion 83 protrudes from the upper surface of the guide member 76. Further, the pressing member 80 can move along the direction of the long hole 78, that is, along the front-rear direction 8. In other words, the pressing member 80 is movable with respect to the frame 72 along the conveyance direction of the recording paper 50 in the discharge path 18.

  The inclined portion 83 is erected at least at the front end so as to be forward (conveying direction) and obliquely upward. That is, the inclined portion 83 has an inclined surface at its front end. And the spring 85 (an example of the urging member of this invention) is attached to the part which protruded from the upper surface of the guide member 76 among the said inclined surfaces. As shown in FIG. 5, the spring 85 has a symmetrical shape. A central portion 86 (see FIG. 7) of the spring 85 is hooked on a protrusion 89 provided on the guide member 76, and bent portions 87 provided on both ends of the spring 85 protrude above the guide member 76 from the long hole 78. It is hooked on 83 inclined surfaces of the inclined portion. When the spring 85 is hooked on the inclined surface, a force 115 perpendicular to the inclined surface as shown by an arrow in FIG. 4 is applied to the inclined surface. That is, a force obtained by resolving the vertical force 115 (a backward force 116 and an upward force 117) is applied to the inclined surface. That is, when the spring 85 is pressed from below the inclined portion 83, the pressing member 80 including the inclined portion 83 is urged rearward and upward.

  As shown in FIGS. 5 to 7, the contact portion 82 is erected downward from the lower surface of the main body portion 81, specifically from the vicinity of the front end of the flat plate 110 of the main body portion 81. That is, the abutting portion 82 is erected downward on the downstream side of the inclined portion 83 in the conveyance direction of the recording paper 50.

  The abutting portion 82 extends in the left-right direction 9 and has an arcuate vertical cross section in which only the vicinity of the lower end is opened. The inner diameter of the arc is substantially the same as the diameter of the transport roller 60. Specifically, the inner diameter of the arc is substantially the same as the diameter of the central portion 161 in the left-right direction 9 of the transport roller 60 where the steel material is exposed. Thereby, the inner surface of the arc of the contact portion 82 is brought into sliding contact with the central portion 161 of the roller surface 160 of the transport roller 60 from a direction other than the lower side. That is, the pressing member 80 including the abutting portion 82 is slidably contacted with the central portion 161 of the roller surface 160 of the conveying roller 60 from at least the upper side and the downstream side in the conveying direction of the recording paper 50.

  Further, as described above, the contact portion 82 is open only in the vicinity of the lower end. Therefore, the contact portion 82 is not slidably contacted with the lower surface 162 of the central portion 161 of the roller surface 160 of the transport roller 60. That is, the contact portion 82 is in sliding contact with the transport roller 60 such that the lower surface 162 of the central portion 161 of the roller surface 160 of the transport roller 60 is exposed to the pinch roller 61. Here, the lower side of the conveying roller 60 is urged by a pinch roller 61, and the conveying roller 60 sandwiches the recording paper 50 between the lower surface of the roller surface 160 and the pinch roller 61. That is, the lower surface of the roller surface 160 of the conveying roller 60 corresponds to the nip surface of the present invention.

  As shown in FIG. 4, the fulcrum portion 84 is erected upward from the substantially center (in the present embodiment, slightly forward from the center) in the front-rear direction 8 of the side plate 111 of the main body portion 81. That is, the fulcrum portion 84 is erected from the upper surface of the main body 81 on the downstream side in the conveyance direction of the recording paper 50 with respect to the inclined portion 83 and on the upstream side in the conveyance direction of the recording paper 50 with respect to the contact portion 82. Yes. The protruding end of the fulcrum part 84 is in pressure contact with the lower surface of the guide member 76 at the point 112. That is, the fulcrum part 84 presses the frame 72 including the guide member 76 from below. As described above, the inclined portion 83 is in a state of being urged by the spring 85, and the contact portion 82 is in a state of being in sliding contact with the conveying roller 60. Accordingly, the inclined portion 83 can be rotated in the direction of the arrow 113 around the point 112, and the contact portion 82 can be rotated in the direction of the arrow 114 around the point 112.

[Effect of the embodiment]
A configuration in which the conveyance roller pair 59 conveys the recording paper 50 at a higher speed than the intermediate roller pair 56, or neither the first intermediate roller 57 nor the second intermediate roller 58 receives a driving force from the conveyance motor. When the recording paper 50 is sandwiched between the conveyance roller pair 59 and the intermediate roller pair 56, the recording paper 50 is stretched between the conveyance roller pair 59 and the intermediate roller pair 56. In this state, when the recording paper 50 is transported in the transport direction and the trailing end of the recording paper 50 comes out of the intermediate roller pair 56, a force is applied to the recording paper 50 in the transport direction at that moment. Then, a force is also applied to the conveyance roller 60 that holds the recording paper 50 in the conveyance direction. However, according to the above-described embodiment, the spring 85 urges the pressing member 80 in the direction opposite to the conveying direction. Thereby, the conveyance roller 60 is pushed by the pressing member 80 in the direction opposite to the conveyance direction. That is, a force is applied to the transport roller 60 in the direction opposite to the transport direction. Therefore, the force in the transport direction applied to the transport roller 60 due to the absence of the load by the intermediate roller pair 56 is canceled by the force in the direction opposite to the transport direction applied to the transport roller 60 by the spring 85. Thereby, it can reduce that the 2nd roller for conveying a recording medium bends in a conveyance direction of a recording medium, or position shift.

  When the vicinity of the front end of the recording paper 50 is sandwiched between the conveyance roller pair 59, the vicinity of the rear end of the recording paper 50 is positioned on the curved path 17. In this case, the vicinity of the rear end of the recording paper 50 may be in a state of being pressed against the outer guide surface 151 of the outer guide member 51. In particular, when the recording paper 50 has a high rigidity, the possibility increases. In this state, when the rear end of the recording paper 50 is located at a position where the outer guide surface 151 is divided, that is, when it is located at a predetermined interval 157 existing at the boundary between the rotation guide member 155 and the fixed guide member 156, At a moment, the state in which the recording paper 50 is pressed against the outer guide surface 156 is canceled, and a force is applied to the recording paper 50 and the transport roller 60 in the transport direction. That is, in this case, the outer guide member 51 corresponds to the load member of the present invention. However, as described above, the force in the conveyance direction with respect to the conveyance roller 60 is offset by the force in the direction opposite to the conveyance direction by the spring 85. As a result, it is possible to reduce the conveyance roller 60 for conveying the recording paper 50 from being bent or displaced in the conveyance direction of the recording paper 50.

  Further, when the vicinity of the front end of the recording paper 50 is sandwiched between the conveyance roller pair 59 and the vicinity of the rear end of the recording paper 50 is located on the inclined plates 24 and 34 of the paper feed trays 21 and 22, In some cases, the inclined plates 24 and 34 are in pressure contact with each other. In particular, when the recording paper 50 has a high rigidity, the possibility increases. In this state, when the rear end of the recording paper 50 passes through the inclined plates 24 and 34 and enters the curved path 17, the state in which the recording paper 50 is pressed against the inclined plates 24 and 34 is canceled at that moment, and the recording paper A force is applied to the conveyance roller 50 and the conveyance roller 60 in the conveyance direction. That is, in this case, the inclined plates 24 and 34 correspond to the load member of the present invention. However, as described above, the force in the conveyance direction with respect to the conveyance roller 60 is offset by the force in the direction opposite to the conveyance direction by the spring 85. As a result, it is possible to reduce the conveyance roller 60 for conveying the recording paper 50 from being bent or displaced in the conveyance direction of the recording paper 50.

  Similarly, when the vicinity of the leading edge of the recording paper 50 is sandwiched between the conveyance roller pair 59 and the vicinity of the trailing edge of the recording paper 50 is positioned in the second conveying path 90, the vicinity of the trailing edge is the third guide member 55. It may be in a state of being pressed against. In particular, when the recording paper 50 has a high rigidity, the possibility increases. In this state, when the rear end of the recording paper 50 passes through the third guide member 55 and enters the curved path 17, the state in which the recording paper 50 is pressed into contact with the third guide member 55 is canceled at that moment. A force is applied to the conveyance roller 50 and the conveyance roller 60 in the conveyance direction. That is, in this case, the third guide member 55 corresponds to the load member of the present invention. However, as described above, the force in the conveyance direction with respect to the conveyance roller 60 is offset by the force in the direction opposite to the conveyance direction by the spring 85. As a result, it is possible to reduce the conveyance roller 60 for conveying the recording paper 50 from being bent or displaced in the conveyance direction of the recording paper 50.

  In the above-described embodiment, the inclined portion 83 is pressed against the spring 85 from below to be biased in the direction opposite to the conveying direction. Thereby, a force is applied to the transport roller 60 in the direction opposite to the transport direction. Therefore, even if a force in the conveyance direction is applied to the conveyance roller 60, the force is canceled by a force opposite to the conveyance direction by the spring 85. As a result, it is possible to reduce the conveyance roller 60 for conveying the recording paper 50 from being bent or displaced in the conveyance direction of the recording paper 50.

  In the above-described embodiment, the inclined portion 83 is also urged upward by being pressed against the spring 85 from below. Thereby, the inclined portion 83 that can be rotated in the direction of the arrow 113 is rotated upward along the direction of the arrow 113. Then, a downward force is applied to the contact portion 82 by the lever principle. As a result, the abutting portion 82 that can rotate in the direction of the arrow 114 is rotated downward along the direction of the arrow 114. That is, the fulcrum part 84 serves as a fulcrum, the inclined part 83 serves as a force point, and the contact part 82 serves as an action point. Thereby, since the conveyance roller 60 will be in the state pressed downward by the contact part 82, the bending and position shift to the up-down direction 7 of the conveyance roller 60 can be reduced.

[Modification of Embodiment]
In the above-described embodiment, the configuration in which the conveyance roller 60 is disposed on the upper side of the first conveyance path 16 and the pinch roller 61 is disposed on the lower side of the first conveyance path 16 has been described. The pinch roller 61 may be disposed on the upper side of the first conveyance path 16. In this case, for example, the pressing member 80 is configured to be vertically symmetrical with respect to the above-described embodiment, and is slidably contacted with the transport roller 60 disposed below the first transport path 16.

10: MFP 11: printer unit 16: first transport path 17: curved path 40: recording unit 51: outer guide member 52: inner guide member 56: intermediate roller pair 57: first intermediate roller 58: second intermediate roller 60 : Conveying roller 61: Pinch roller 72: Frame 80: Pressing member 81: Body portion 82: Abutting portion 83: Inclined portion 84: Supporting point portion 85: Spring 151: Outer guide surface

Claims (12)

A recording unit for recording an image on a recording medium guided along the conveyance path;
A first roller provided upstream of the recording unit in the direction of conveyance of the recording medium, and a second roller disposed opposite to the first roller and rotated by receiving a driving force from a motor. A transport unit for transporting a recording medium;
A support member having a support portion that rotatably supports the second roller at both axial end portions of the second roller;
A pressing member provided between the support portions in the axial direction and in sliding contact with the second roller so that the first roller side of the second roller is exposed;
An image recording apparatus comprising: an urging member that urges the pressing member.   The image recording apparatus according to claim 1, wherein the urging member urges the pressing member in a direction from the second roller toward the first roller. A platen that supports the recording medium conveyed to the recording unit;
3. The image recording according to claim 1, wherein the pressing member is in sliding contact with a central portion in the axial direction of a passing area of a recording medium conveyed on the platen of the second roller. apparatus.   The image recording apparatus according to claim 1, wherein the pressing member is in sliding contact with a central portion of the second roller in the axial direction.   5. The image recording apparatus according to claim 3, wherein the second roller is ceramic processed on both sides of the central portion in the axial direction. 6.   The image recording apparatus according to claim 1, further comprising a metal support member made of metal that supports the urging member. The presser member is
On the downstream side of the transport direction of the second roller, a contact portion is provided to stand in a direction perpendicular to the transport direction and the axial direction.
The image recording apparatus according to claim 1, wherein the contact portion is slidably contactable with the second roller from a downstream side in the transport direction. The presser member is
On the upstream side in the transport direction of the second roller, it has a contact portion standing in a direction perpendicular to the transport direction and the axial direction,
The image recording apparatus according to claim 1, wherein the contact portion is slidably contactable with the second roller from an upstream side in the transport direction.   A load member provided upstream of the first roller and the second roller in the transport direction and generating a load on the recording medium sandwiched between the first roller and the second roller. The image recording apparatus according to claim 1.   The load member is a third roller and a fourth roller that are provided upstream of the first roller and the second roller in the transport direction in the transport path, and are capable of sandwiching a recording medium. The image recording apparatus described. The transport path includes a curved path formed in a curved shape on the upstream side in the transport direction from the first roller and the second roller,
The load member is a contact guide member that comes into contact with a recording medium conveyed along the curved path,
The contact guide member includes a fixed guide member and a rotation guide member,
The image recording apparatus according to claim 9, wherein an interval exists between the fixed guide member and the rotation guide member. A tray on which a recording medium is placed;
A feeding unit that feeds the recording medium placed on the tray in the feeding direction toward the upstream side in the conveying direction from the first roller and the second roller in the conveying path;
An inclined member erected from a downstream position in the feeding direction of the recording medium placed on the tray,
The recording medium placed on the tray is fed to the conveyance path along the inclined member,
The image recording apparatus according to claim 9, wherein the load member is the inclined member.

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