JP6149551B2 - Recording device - Google Patents

Description

  The present invention relates to a recording apparatus including a recording unit that performs recording on a medium supported by a support surface, and a transport unit that transports the medium.

  In general, an ink jet printer is widely known as an example of a recording apparatus that performs recording on a medium. In an ink jet printer, ink (liquid) is directed from a liquid ejecting head (recording head) included in a recording unit toward a sheet (medium) supported by a support surface facing a liquid ejecting head that is a recording unit provided in the support unit. ) Is printed (printed). The printed paper is nipped and conveyed by a pair of paper discharge rollers as a discharge unit, and is discharged from the recording unit (support surface).

  In this type of printer, there is a case where a cockling phenomenon occurs in which the paper is waved and deformed due to the extension of the paper portion where the ejected ink is absorbed. The wave-deformed paper is likely to be lifted from the support surface, and there is a risk of so-called head rubbing or the like that contacts the liquid ejecting head during conveyance by the paper discharge roller. For this reason, the driven roller (star wheel), which has serrated teeth on the peripheral surface and rotates according to the conveyance of the sheet, comes into contact with the printed sheet to be conveyed from the side opposite to the support surface. There has been proposed a structure that suppresses the lifting of (see, for example, Patent Document 1).

JP 2008-36907 A

  The recording apparatus preferably transports the medium while being pressed against the support surface in order to improve the recording quality. Therefore, a configuration in which the medium nip point in the discharge unit is positioned above the support surface may be employed. With such a configuration, the medium can be stably brought into contact with the support surface, and the ink ejected from the liquid ejecting head can be landed with high accuracy. In this configuration, the driven roller that suppresses the lift of the medium reversely advances in the direction opposite to the conveyance direction from the medium conveyed in an inclined manner, in addition to the advancing force that continues in the medium conveyance direction when in contact with the medium. You will receive progress.

  Further, the recording apparatus is required to be downsized. In order to meet this demand, the distance between the support surface and the nip point of the discharge portion may be shortened, and at that time, the paper from the support surface to the nip point of the discharge portion will be more than before. The route may have a steep slope. In this case, the reverse force that the driven roller receives from the medium becomes larger than before, and the driven roller that suppresses the lifting of the medium moves back and forth in the transport direction and the direction opposite to the transport direction. There has been a problem that the shaft portion repeatedly collides with the bearing to generate abnormal noise.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a recording apparatus in which a driven roller that rotates following the conveyance of a medium can rotate in a stable state without generating abnormal noise. There is to do.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
A recording apparatus that solves the above problems includes a recording unit that performs recording on a conveyed medium, a support unit that is disposed to face the recording unit and has a support surface that supports the medium, and the medium toward the recording unit. A transport unit that transports the recording medium, and the recorded medium is ejected from the support surface, and is positioned between the discharge unit and the support surface, and is ejected. A holder having a driven roller that is in contact with the medium from the side opposite to the support surface and can be rotated by following the discharge of the medium, and a bearing that rotatably supports a shaft portion of the driven roller. And the bearing is inclined with respect to the support surface on a side opposite to the medium in a direction intersecting a conveyance direction of the medium at a contact portion of the medium with respect to the shaft portion. An inclined surface is provided .

  According to this configuration, when the driven roller that rotates following the conveyance of the medium receives a pressing force from the contact portion of the medium and moves, the shaft portion of the driven roller contacts the inclined surface, thereby bearing along the inclined surface. Therefore, the fluttering phenomenon in which the shaft portion repeatedly moves in the conveying direction in the bearing is suppressed. Therefore, since the shaft portion rotates stably in the bearing, the generation of abnormal noise due to the flapping phenomenon is suppressed.

  In the recording apparatus, the inclined surface provided on the bearing is provided with an inclination angle greater than or equal to an inclination angle of the tangent line of the driven roller with respect to the support surface at a contact portion where the driven roller contacts the medium. Is preferred.

  According to this configuration, it is possible to suppress the generation of a component force in the direction opposite to the conveyance direction due to the pressing force received from the medium by the driven roller that rotates following the conveyance of the medium. Therefore, since the shaft portion rotates stably on one side (conveyance direction side) in the bearing, the generation of abnormal noise due to the flapping phenomenon is suppressed.

  In the recording apparatus, the inclined surface provided on the bearing is provided with an inclination angle larger than an inclination angle of the tangent line of the driven roller with respect to the support surface at a contact portion where the driven roller contacts the medium. It is preferable.

  According to this configuration, a component force that moves the shaft portion toward the conveyance direction on the inclined surface can be generated with high probability by the pressing force received from the medium by the driven roller that rotates following the conveyance of the medium. Therefore, by suppressing the generation of the component force in the direction opposite to the conveyance direction side, the shaft part rotates stably on one side of the bearing (conveyance direction side), so that abnormal noise is generated due to the flapping phenomenon. Is suppressed.

  In the recording apparatus, an inclination angle of the inclined surface provided in the bearing is an angle equal to an inclination angle of a tangent line of the driven roller with respect to the support surface at a contact portion where the driven roller contacts the medium. preferable.

  According to this configuration, when the medium is transported between the support surface and the discharge portion in both the forward and reverse directions of the transport direction, the pressing force received from the medium by the driven roller that rotates following the transport of the medium is Also in the conveyance in the direction, the shaft portion is pressed in a direction substantially orthogonal to the inclined surface. Therefore, in any transport direction, generation of a component force in the direction opposite to the transport direction is suppressed with respect to the shaft portion that contacts the inclined surface by the pressing force received from the medium. As a result, when the medium is transported in both directions, the shaft portion is stably rotated on one side (the transport direction side) in the bearing by moving to the medium transport direction side in the bearing. Generation of abnormal noise due to flapping is suppressed.

In the recording apparatus, it is preferable that the inclined surface is provided in at least a partial region of the bearing width region in the bearing.
According to this configuration, the shaft portion comes into contact with the inclined surface when moving in the area of the bearing width. Since the rotation in the direction opposite to the transport direction is suppressed by the contact with the inclined surface, the generation of abnormal noise due to flapping is suppressed.

In the recording apparatus, it is preferable that the holder portion is provided with an angle adjustment mechanism capable of adjusting an inclination angle formed by the inclined surface of the bearing with the support surface.
According to this configuration, for example, when the inclination angle formed by the tangent of the driven roller at the contact point where the driven roller contacts the medium and the support surface varies depending on the medium conveyed by the conveying unit, the changed angle. It is possible to adjust the inclination angle of the bearing so as to meet the above. Therefore, since the shaft portion rotates stably in the bearing, generation of abnormal noise due to flapping is suppressed.

In the recording apparatus, it is preferable that the support surface of the support portion is a horizontal plane extending in a horizontal direction intersecting the vertical direction.
According to this configuration, for example, in a recording apparatus having a support unit that is normally used and the support surface of the medium is a horizontal surface, the driven roller is stably rotated when the medium discharged from the support unit is transported. As a result, a recording apparatus in which the generation of abnormal noise due to flapping is suppressed can be obtained.

1 is a perspective view illustrating an ink jet printer according to an embodiment. 1 is a cross-sectional view illustrating an ink jet printer according to an embodiment. FIG. 4 is a partial cross-sectional view illustrating a structure of a printing unit, a paper support unit, and a conveyance unit. FIG. 3 is a perspective view illustrating a structure of a carriage that constitutes a printing unit. The perspective view which shows the structure of the position adjustment mechanism with which the carriage was equipped. FIG. 3A is a structural member of the first cam mechanism, wherein FIG. 3A is a perspective view of the first sliding member, FIG. 3B is a perspective view of the first cam member, and FIG. 3C is a rear view of the first cam member. ) Is a perspective view of the engaging member. It is a structural member of a 2nd cam mechanism, Comprising: (a) is a front view of a 2nd sliding member, (b) is a front view of a 2nd cam member. The disassembled perspective view which shows the rotation suppression structure of the gearwheel which comprises a position adjustment mechanism. (A) is sectional drawing which shows the conveyance part of a paper, and the holder part which has a bearing provided with the inclined surface which receives the axial part of a paper pressing roller, (b) is a perspective view of a paper pressing roller. Sectional drawing of the bearing provided with the bearing width in which the paper pressing roller can rotate smoothly. FIG. 6 is an operation explanatory diagram of a paper pressing roller that follows the paper discharged from the support surface. FIG. 9 is an operation explanatory diagram of a paper pressing roller that follows a paper sheet that moves toward a support surface. Operation | movement explanatory drawing of the paper pressing roller pivotally supported by the bearing which has a shape of a modification. The schematic structure figure which shows the holder part which a bearing part can rotate in a modification. (A) (b) is a cross-sectional shape figure which shows the other modification of the bearing shape provided in a holder part.

  Hereinafter, an embodiment of an ink jet printer (hereinafter also simply referred to as “printer”) as a fluid ejecting apparatus as an example of a recording apparatus will be described with reference to the drawings. The printer of this embodiment performs printing (recording) on the paper P by ejecting ink, which is an example of fluid, onto the paper P, which is an example of a medium, to form an image or the like.

  As shown in FIG. 1 and FIG. 2, the printer 11 of the present embodiment includes a main body case 12 that is configured by a plurality of housing members, and whose outer shape has a substantially rectangular parallelepiped shape. In the main body case 12, an image reading unit 15 such as a scanner unit is disposed on the upper surface side which is the antigravity direction Z side in the vertical direction. In the main body case 12, a printing unit 20, which is an example of a recording unit that prints (records) an image by ejecting ink onto the paper P, overlaps with the lower side of the image reading unit 15 in the upper arrow direction. It is arranged and provided.

  In the main body case 12, an operation panel 13 for operating the printing unit 20 and the like is disposed on the front side that is the discharge direction side of the paper P printed by the printing unit 20. The operation panel 13 includes a display unit (for example, a liquid crystal display) and an operation unit (for example, operation buttons) for displaying a menu screen and the like. The operation panel 13 is configured such that the lower side is lifted forward by a rotating mechanism such as a hinge (not shown) provided on the upper side thereof, and is opened to be opened and closed.

  On the rear side opposite to the front side on which the operation unit 13 is provided with respect to the operation panel 13, a discharge port for discharging the printed paper P out of the main body case 12 is disposed in the main body case 12. From a paper discharge port (not shown) that is exposed when the panel 13 is opened, the paper P is discharged forward as shown by a white arrow in FIG.

  The printer 11 of this embodiment includes a paper feed cassette 30 as a paper feed unit that supplies paper P to the printing unit 20. The paper feed cassette 30 can store the paper P in a stacked state, and is disposed below the operation panel 13 so that it can be inserted into and removed from the main body case 12. The accommodated paper P is fed to the printing unit 20 one by one by being fed to the feeding path of the paper P disposed on the back side (rear side) in the insertion direction by the feeding roller 31. The

  Further, in addition to supplying the paper P from the paper feed cassette 30 to the printing unit 20, the printer 11 has a paper P in an upper portion of the main body case 12 on the rear side opposite to the front side where the operation panel 13 is provided. A manual sheet feeding unit 14 is provided for manually feeding the sheets one by one. In the manual paper feed unit 14, an opening / closing lid 14 a that opens and closes an insertion port 32 into which the paper P is inserted is provided in the main body case 12 so as to be swingable. Accordingly, the user supplies the paper P to the printing unit 20 by inserting the paper P into the insertion port 32 exposed by swinging the opening / closing lid 14a rearward as indicated by an arrow R in FIG. Is also possible.

  As shown in FIG. 2, in the printer 11 of the present embodiment, the paper transport path for transporting the paper P supplied from both the paper feed cassette 30 and the manual paper feed section 14 to the printing section 20 is a supply path. It is provided as. That is, the paper transport path is formed by a plurality of housing members that constitute the main body case 12. A first roller R1, a second roller R2, a third roller R3, and a fourth roller R4 are rotatably disposed along the paper transport path. Among these, the first roller R1 is a roller driven by a driving source, and the other second roller R2, third roller R3, and fourth roller R4 are rollers driven by the rotation of the first roller R1.

  As shown in FIG. 2, the rollers P sequentially transport the paper P in the paper feed cassette 30 from the paper feed cassette 30 side, which is upstream in the transport direction, toward the printing unit 20 side, which is downstream in the transport direction. A first transport path 35, a second transport path 36, and a third transport path 37 are formed. The first roller R1 rotates through these conveyance paths as indicated by arrows in FIG. 2, whereby the paper P is conveyed as indicated by broken line arrows K1 and K3 in FIG. Supplied to.

  In addition, the conveyance path of the manually fed paper P supplied from the manual sheet feeding unit 14 includes a manual conveyance path 33 having an insertion port 32 at one end. The manual conveyance path 33 communicates with the second conveyance path 36 when a part of the constituent members of the main body case 12 is displaced as shown by a two-dot chain line in FIG. With this communication, the paper P inserted from the insertion port 32 is fed to the printing unit 20 as indicated by broken line arrows K2 and K3 in FIG.

  The supplied paper P is nipped by a paper feed roller pair 16 composed of a pair of rollers rotatably supported by the main body case 12, conveyed in the sub-scanning direction Y, and paper P arranged opposite to the printing unit 20. Is supported on the upper surface of the support base 26 as a support portion for supporting the above, that is, on the support surface 26 a of the support base 26.

  The printing unit 20 includes a carriage 23 and a liquid ejecting head 25, and performs printing by moving relative to the paper P conveyed on the support surface 26a. That is, in the main body case 12, the first rail member 21 and the second rail member 22 extending along the width direction intersecting the transport direction of the paper P transported on the support surface 26 a include the paper P. It is arranged in the main body case 12 with a predetermined interval in the transport direction. The width direction is also referred to as the main scanning direction X, and for convenience of explanation, the left direction as viewed from the front of the printer 11 may be referred to as the X direction and the right direction may be referred to as the −X direction.

  The carriage 23 is supported so as to be movable in the main scanning direction X along the two first rail members 21 and the second rail member 22. That is, the carriage 23 reciprocates along the main scanning direction X along the first rail member 21 and the second rail member 22 with the driving of a carriage motor (not shown). In FIG. 1, the shapes of the carriage 23, the first rail member 21, and the second rail member 22 are illustrated in a simplified manner.

  Thereafter, the paper P on which printing has been completed on the surface (printing surface) of the paper P moving on the support base 26 (support surface 26a) by the printing unit 20 is as shown by a two-dot chain line arrow K4 in FIG. The paper is sandwiched by a pair of paper discharge rollers 17 including a pair of rollers rotatably supported by the main body case 12, conveyed in the sub-scanning direction Y, and discharged from a discharge port.

  Furthermore, the printer 11 of the present embodiment can perform printing on both sides of the paper P. That is, after the printing unit 20 finishes printing on one side (front surface) on the paper P, the paper discharge roller pair 17 is driven in reverse. By this reverse rotation, the paper P is returned to the rear in the direction opposite to the transport direction (sub-scanning direction Y), and is sandwiched between a pair of rollers of the first roller R1 and the fourth roller R4, thereby causing the third transport path 37. Is transported to a fifth transport path 38 provided behind. When the sheet P is transported to the fifth transport path 38, the front and back are reversed, and then the sheet P is moved again from the first transport path 35 to the second transport path 36 and the third transport path 37, and the printing unit 20. Printing on the back surface is performed.

  In the present embodiment, a plurality of ink cartridges EK (see FIG. 4) containing ink to be supplied to the liquid ejecting head 25 during printing by the printing unit 20 are mounted and disposed on the carriage 23. A cover member 24 that covers the ink cartridge EK is positioned at the uppermost portion of the carriage 23 and is provided so as to be swingable about a rotation shaft 24 a that is rotatably supported by the carriage 23.

  As shown in FIG. 2, the cover member 24 has a shape that does not interfere with the lower surface of the image reading unit 15 when moving below the image reading unit 15 as the carriage 23 moves in the main scanning direction X. ing. That is, the cover member 24 is provided with a concave portion 24b so as to follow the convex portion 15a formed on the lower surface of the image reading unit 15 with a gap. The concave portion 24b is formed by cutting out a part of the cover member 24, and the mounted ink cartridge EK is exposed from the opening 24c formed by the cutout (see FIG. 4).

  Accordingly, the cover member 24 provided with the concave portion 24b in this way has a shape that does not interfere with the lower surface (the convex portion 15a) of the image reading unit 15 and suppresses the ink cartridge EK from coming out of the carriage 23. In addition, it is possible to easily recognize whether or not the carriage 23 is mounted.

Next, the printing unit 20 will be described in detail with reference to FIG.
As shown in FIG. 3, on the lower surface side (−Z direction) that is the gravity direction side of the carriage 23, the liquid ejecting head 25 that ejects ink includes the two first rail members 21 and the second rails 21 in the transport direction of the paper P. It is supported between the rail member 22. Then, by moving the carriage 23, the liquid ejecting head 25 is moved, and ink is ejected from the moving liquid ejecting head 25 onto the paper P indicated by a thick two-dot chain line in FIG.

  The paper P is supported by a support surface 26a of a support base 26 as an example of a support unit from below, and a paper feed roller that is a transport unit that is rotationally driven by a drive source (motor) (not shown) when the carriage 23 moves. The pair 16 and a discharge roller pair 17 serving as a discharge unit are transported along the sub-scanning direction Y intersecting the main scanning direction X on the support base 26. In the present embodiment, the support surface 26a is an upper surface of the support base 26 and is a single surface constituted by a plurality of planes partially existing. Accordingly, the paper P moving on the support surface 26a is conveyed on one surface while being supported by the plurality of flat surfaces. In the present embodiment, the support surface 26a of the support base 26 is a horizontal plane extending in the horizontal direction intersecting the vertical direction.

  The paper feed roller pair 16 includes a paper feed driven roller 16a and a paper feed drive roller 16b. Here, the paper feed roller pair 16 feeds the paper P to be transported downward and transports the paper P so as to press it against the support surface 26a. Therefore, the paper feed driven roller 16a is provided with the center of rotation shifted from the paper feed drive roller 16b to the downstream side in the transport direction of the paper P, and the nip point between the paper feed roller pair 16 sandwiching the paper P is the support surface 26a. It is the structure located above. With such a configuration, the paper P is conveyed while being stably pressed against the support surface 26a, and the ink ejected from the liquid ejecting head 25 can be landed with high accuracy.

  On the other hand, the discharge roller pair 17 includes a discharge driven roller 17a and a discharge driving roller 17b. Here, the paper discharge roller pair 17 presses the paper P against the support surface 26a together with the paper feed roller pair 16 in order to land the ink ejected from the liquid jet head 25 on the paper P with high accuracy. That is, the discharge driven roller 17a is provided with the center of rotation shifted from the discharge driving roller 17b on the upstream side in the transport direction of the paper P, and the nip point between the paper P of the paper discharge roller pair 17 is the support surface 26a. It is located above. With such a configuration, the paper P can be stably pressed against and contacted with the support surface 26a, and the ink protruding from the liquid ejecting head 25 can be landed on the paper P with high accuracy.

  It is desirable that the nip point of the paper feed roller pair 16 and the nip point of the paper discharge roller pair 17 are both positioned above the support surface 26a. Of course, either the nip point of the paper feed roller pair 16 or the nip point of the paper discharge roller pair 17 may be positioned above the support surface 26a. Even in this case, there is an effect of pressing the paper P against the support surface 26a, and the ink ejected from the liquid ejecting head 25 can be landed on the paper P with high accuracy.

  When both the movement of the carriage 23 in the main scanning direction X and the movement of the paper P in the sub-scanning direction Y on the support surface 26a are performed, the liquid jet positioned on the antigravity direction Z side in the vertical direction of the paper P Printing is performed by ejecting ink from the head 25 onto the surface (printing surface) of the paper P. When duplex printing is performed, the paper P on which printing is performed on the front surface is conveyed in a direction opposite to the sub-scanning direction Y by reverse driving of the discharge roller pair 17 and the front and back sides are reversed. Printing on the back surface (printing surface) is performed by being conveyed along the sub-scanning direction Y intersecting the main scanning direction X again on the support base 26. The paper P printed on the printing surface in this way is discharged from the printing unit 20 by being conveyed in the sub-scanning direction Y, and then discharged from the main body case 12 through the paper discharge port. Accordingly, in the present embodiment, the paper discharge roller pair 17 functions as a transport unit.

  In the printer 11 of the present embodiment, the paper discharge roller pair 17 is in the direction of the extension of the support surface 26a and downstream in the transport direction with respect to the support surface 26a of the support base 26 arranged to face the printing unit 20. The paper P is transported away from the surface of the support surface 26a and away from the upper position where the printing unit 20 is located. Furthermore, it is located between the paper discharge roller pair 17 and the support surface 26a, contacts the conveyed paper P from the side opposite to the support surface 26a, and can be rotated by following the conveyance of the paper P. A paper pressing roller 18 as a driven roller is provided.

  A plurality of paper pressing rollers 18 are provided along the main scanning direction X, and each of the shaft portions 18j is aligned with the bearing 81 provided on the holder portion 80 fixed to the main body case 12 in the main scanning direction X. As a direction, it is rotatably supported. Therefore, the paper pressing roller 18 has a function of suppressing the paper P so that the paper P does not float from the support surface 26a during conveyance. A problem that occurs when the nip point of the paper feed roller pair 16 that is the transport unit and the nip point of the paper discharge roller pair 17 that is the discharge unit are positioned above the support surface 26a will be described later.

  Furthermore, in the printer 11 of the present embodiment, the distance between the liquid ejecting head 25 and the paper P on the support base 26, that is, the liquid ejecting head 25 and the support base 26 (support surface 26a) is adjusted by adjusting the height position of the carriage 23. A position adjusting mechanism PAJ for adjusting the gap PG is provided. The position adjusting mechanism PAJ will be described below with reference to the drawings.

  As shown in FIGS. 3 and 4, the carriage 23 is supported by the first rail member 21 and the second rail member 22 on the upstream side and the downstream side in the sub-scanning direction Y, respectively. Specifically, the carriage 23 includes a housing 23 </ b> A, a first sliding member 41 that slides on the first rail surface 21 a that is the upper surface of the first rail member 21, and a first surface that is the upper surface of the second rail member 22. And a second sliding member 51 that slides with respect to the two rail surfaces 22a. The first sliding member 41 and the second sliding member 51 are respectively supported by the first rail surface 21a and the second rail surface 22a, so that the liquid ejecting head 25 and the paper P on the support base 26 The distance is determined.

  Each of the first sliding member 41 and the second sliding member 51 is provided with a first cam mechanism 40 and a second cam mechanism 50 as a position adjusting mechanism PAJ between the housing 23A of the carriage 23, By the operation of these cam mechanisms, the housing 23 </ b> A of the carriage 23 is displaced in the vertical direction relative to the first sliding member 41 and the second sliding member 51. When the carriage 23 moves along the main scanning direction X, the first cam mechanism 40 and the second cam mechanism 50 are engaged with the protruding portion 19 protruding upward from the first rail surface 21a. Both members operate by engaging the member 45 (see FIG. 5), and adjust the displacement of the carriage 23 in the vertical direction. As a result, the carriage 23 is displaced in both the first rail member 21 and the second rail member 22, and the gap PG between the liquid ejecting head 25 and the support base 26 (support surface 26a) is adjusted. That is, the carriage 23 is provided with a cam interlocking mechanism 60 that interlocks the cam operation between the first cam mechanism 40 and the second cam mechanism 50.

The first cam mechanism 40, the second cam mechanism 50, and the cam interlocking mechanism 60 will be described with reference to FIG.
As shown in FIG. 5, the carriage 23 is provided with a first cam mechanism 40 on the upstream side in the sub-scanning direction Y and a second cam mechanism 50 on the downstream side thereof. A cam interlocking mechanism 60 that interlocks the first cam mechanism 40 and the second cam mechanism 50 is configured using a plurality of gears (gears) that are rotatably attached to the housing 23A.

  The first cam mechanism 40 includes a first cam member 43 provided with a first rack 43 a that extends along the main scanning direction X and is displaceable in the main scanning direction X, while the second cam mechanism 50 also performs main scanning. The second cam member 53 is provided with a second rack 53 a that extends along the direction X and is displaceable in the main scanning direction X.

  The cam interlocking mechanism 60 includes a first transmission gear 61 that engages with the first rack 43a, a second transmission gear 62 that engages with the first transmission gear 61, a pinion 65a that engages with the second transmission gear 62, and a pinion 65b. A third transmission gear 63 to be engaged, a third transmission gear 63, and a fourth transmission gear 64 to be engaged with the second rack 53a are provided. The pinion 65 a and the pinion 65 b are connected by a gear shaft 65 c extending between the first cam mechanism 40 and the second cam mechanism 50, thereby forming a pinion gear shaft 65.

  One of the cam interlocking mechanisms 60 is engaged with the first cam mechanism 40, and the other is engaged with the second cam mechanism 50. That is, when the first rack 43a is displaced in the main scanning direction X, the cam interlocking mechanism 60 converts the linear motion of the first rack 43a into a rotational motion by the first transmission gear 61, and the converted rotational motion is second transmitted. This is transmitted to the fourth transmission gear 64 via the gear 62, the pinion gear shaft 65 and the third transmission gear 63. The fourth transmission gear 64 transmits the transmitted rotational motion as a linear motion to the second rack 53a. By this transmission, the cam interlocking mechanism 60 moves the second rack 53a in conjunction with the first rack 43a in the same direction as the direction in which the first rack 43a moves.

  Thus, the cam interlocking mechanism 60 is configured to connect the first cam mechanism 40 and the second cam mechanism 50 with a plurality of mechanisms such as gears. The cam interlocking mechanism 60 is a power that displaces the carriage 23 of the first cam mechanism 40 in conjunction with the displacement of the carriage 23 (housing 23A) in the vertical direction in which the first cam mechanism 40 changes the gap PG. Is transmitted to the second cam mechanism 50, and the second cam mechanism 50 displaces the carriage 23 (housing 23A) in the vertical direction in which the gap PG is changed.

  Next, referring to FIGS. 5, 6A to 6D, and FIGS. 7A and 7B, a first cam mechanism 40 that vertically displaces the carriage 23 (housing 23A), The configuration of the second cam mechanism 50 will be described.

  As shown in FIG. 5, the first cam mechanism 40 includes a first sliding member 41 that slides while contacting the first rail surface 21 a, and a first cam member 43 that engages with the first sliding member 41. And an engaging member 45 that engages with the first cam member 43.

  As shown in FIG. 6A, the first sliding member 41 extends with the main scanning direction X as the longitudinal direction, and the lower surface side (−Z direction side) of the extending portion in the longitudinal direction is the first rail. The surface 21a is a sliding surface that slides. Further, both end portions 41a and 41b in the longitudinal direction of the first sliding member 41 are contact portions that contact the housing 23A of the carriage 23, and the first sliding member 41 is in contact with the housing 23A in the main scanning direction X. The casing 23 </ b> A is vertically movable relative to the first sliding member 41 while being restricted so as not to move relatively.

  In addition, a plurality of contact portions 41 c (two in this case) are provided on the upper surface of the first sliding member 41 to contact the first cam portion 44 (see FIG. 6C) of the first cam member 43. . Furthermore, hook portions 41 f for hooking the first spring member 42 are provided at both longitudinal ends of the upper surface of the first sliding member 41. That is, the first sliding member 41 is configured to be urged against the housing 23A by the first spring member 42 that is hooked on the hook portion 41f. The first sliding member 41 is provided with a guide pin 41 p that guides the movement of the engaging member 45 so as to protrude in the direction opposite to the sub-scanning direction Y.

  As shown in FIGS. 6B and 6C, the first cam member 43 has a first rack 43a formed on the upper surface thereof, and contacts the housing 23A to support the housing 23A from below. A first contact surface 43b is formed. An engagement pin 43p that engages with the engagement member 45 is formed on the surface of the first cam member 43 opposite to the sub-scanning direction Y, and the first cam member 43 is relative to the housing 23A. A guide portion 43c for guiding a typical slide movement is formed.

  On the other hand, a step-like first cam portion 44 is provided on the surface in the sub-scanning direction Y side, which is the back side of the surface on which the engagement pin 43p of the first cam member 43 is formed. In the present embodiment, the first cam portion 44 is provided with four step portions 44a via inclined portions 44b. Any one of the four step portions 44 a engages the contact portion 41 c of the first sliding member 41, so that the first cam member 43 is displaced in the vertical direction relative to the first sliding member 41. The casing 23A supported by the first contact surface 43b is displaced in the vertical direction together. The gap PG between the liquid jet head 25 and the support surface 26a is defined by the displacement of the housing 23A of the carriage 23. Further, when the first cam member 43 slides with respect to the first sliding member 41, the gap PG changes as the contact portion 41c moves along the inclined portion 44b.

  As shown in FIG. 6D, the engaging member 45 is formed as a plate-like member extending with the main scanning direction X as the longitudinal direction. The engaging member 45 is provided with a protrusion 46 at the lower end opposite to the Y side in the sub scanning direction. The protrusion 46 engages with the protrusion 19 protruding upward from the first rail surface 21a, whereby the engagement member 45 is moved along with the movement of the housing 23A (carriage 23). It slides relative to 41 along the main scanning direction X. Further, the engaging member 45 is provided with a long hole 45h into which the engaging pin 43p of the first cam member 43 is loosely inserted. The first cam member 43 slides together with the engaging member 45 when the engaging pin 43p is loosely inserted into the elongated hole 45h.

  Therefore, in the first cam mechanism 40, the engaging member 45 engages with the protruding portion 19 protruding upward from the first rail surface 21a and slides, whereby the first cam member 43 is moved to the first sliding member 41. It moves relative to the slide. As the first cam member 43 slides, the position at which the contact portion 41c of the first sliding member 41 contacts at the first cam portion 44 moves, and the carriage moves according to the contact position of the moved first cam portion 44. 23 casings 23 </ b> A are displaced in the vertical direction with respect to the first sliding member 41. The engaging member 45 is provided with a guide groove 45a extending in the longitudinal direction in which the guide pin 41p of the first sliding member 41 is loosely inserted. When the guide pin 41p of the first sliding member 41 is loosely inserted into the guide groove 45a, the engaging member 45 slides in the main scanning direction X when sliding relative to the first sliding member 41. It is configured not to slide in the direction.

  Next, as shown in FIG. 5, the second cam mechanism 50 is engaged with the second sliding member 51 that slides while contacting the second rail surface 22a, and the second sliding member 51 and the second sliding member 51. 2 cam members 53. In the second cam mechanism 50, the sliding movement of the first cam member 43 is transmitted by the cam interlocking mechanism 60, and the second cam member 53 having the second rack 53 a that meshes with the fourth transmission gear 64 is connected to the first cam member 43. In conjunction with the movement, it slides along the main scanning direction X.

  As shown in FIG. 7 (a), the second cam member 53 has a second rack 53a formed on the upper surface thereof, and is in contact with the housing 23A of the carriage 23 to support the housing 23A from below. A contact surface 53b is formed. Further, a step-like second cam portion 54 is provided on the surface of the second cam member 53 opposite to the sub-scanning direction Y side. In the present embodiment, the second cam portion 54 is provided with four step portions 54 a via inclined portions 54 b as in the first cam portion 44.

  As shown in FIG. 7B, the second sliding member 51 extends with the main scanning direction X as the longitudinal direction, and the second cam member 53 has a second surface on the upper surface of the extending portion in the longitudinal direction. A plurality (two in this case) of contact portions 51c that come into contact with the cam portion 54 are provided. The lower surface side (−Z direction side) of the extending portion is a sliding surface that slides on the second rail surface 22a. Further, on the surface opposite to the sub-scanning direction Y side of the second sliding member 51, the second sliding member 51 is allowed to be displaced relative to the second sliding member 51 in the vertical direction of the casing 23A of the carriage 23, while A regulation pin 51p that regulates relative displacement of the sliding member 51 along the main scanning direction X with respect to the housing 23A of the carriage 23 is provided.

  Therefore, in the second cam mechanism 50, the second cam member 53 slides by the cam interlocking mechanism 60, whereby the position where the contact portion 51c of the second sliding member 51 contacts in the second cam portion 54 moves. The second cam member 53 is displaced in the vertical direction relative to the second sliding member 51 in accordance with the contact position of the moved second cam portion 54. Then, the housing 23 </ b> A of the carriage 23 supported by the second contact surface 53 b of the second cam member 53 is displaced in the vertical direction together with the displacement of the second cam member 53, whereby the liquid jet head 25. And the support surface 26a is defined as a gap PG. In addition, when the second cam member 53 slides relative to the second sliding member 51, the gap PG changes as the contact portion 51c moves along the inclined portion 54b.

  In the change of the gap PG, the cam interlocking mechanism 60 causes the vertical displacement of the carriage 23 (housing 23A) by the first cam mechanism 40 and the vertical movement of the carriage 23 (housing 23A) by the second cam mechanism 50. The slide movement of the first cam member 43 is transmitted to the slide movement of the second cam member 53 so that the displacement is synchronized. As a result, the first cam member 43 and the second cam member 53 move in conjunction with each other, so that the carriage 23 (housing 23A) is displaced with the inclination of the support surface 26a being suppressed, while the gap PG To change.

  By the way, in the printer 11, in order to maintain the ejection characteristics of ink from the liquid ejection head 25, the liquid ejection head 25 provided on the carriage 23 may be covered with a cap member. In such a case, in order to cover the liquid ejecting head 25 with the cap member, the carriage 23 may be pushed up by coming into contact with the liquid ejecting head 25 from below. In such a case, for example, in the second cam mechanism 50, the housing 23A of the carriage 23 supported by the second contact surface 53b of the second cam member 53 is connected to the second contact surface 53b, that is, the second cam member 53. Since the upper part moves away from the upper surface, the mesh between the second rack 53a and the fourth transmission gear 64 may be disengaged.

  As a result, in the cam interlocking mechanism 60, for example, the fourth transmission gear 64 rotates due to backlash existing between the meshing gears, and in the meshing between the fourth transmission gear 64 and the second rack 53a, The meshing position may be deviated, for example, by one tooth. Then, the relative position between the second cam member 53 and the second sliding member 51 is changed to a position different from that before the meshing position shift occurs, and the second cam member 53 moves as the first cam member 43 slides. The position in the main scanning direction X will be different. As a result, the vertical displacement of the casing 23A of the carriage 23 is not synchronized, and a difference occurs in the vertical displacement.

  Similarly, in the first cam mechanism 40, the housing 23 </ b> A of the carriage 23 supported by the first contact surface 43 b of the first cam member 43 moves upward away from the upper surface of the first cam member 43. Can happen. At this time, since the first sliding member 41 is urged against the housing 23A by the first spring member 42 hooked by the hook portion 41f, in the first cam mechanism 40, the first rack 43a and the first rack member 1 is prevented from being disengaged from the transmission gear 61.

  Therefore, in the printer 11 of the present embodiment, when the housing 23A of the carriage 23 is separated from the second contact surface 53b of the second cam member 53, the fourth transmission gear 64 that has disengaged from the second rack 53a is released. The cam interlocking mechanism 60 is provided with a rotation suppression structure that suppresses rotation by generating a rotational torque so as not to rotate.

  As shown in FIG. 8, the rotation suppression structure for the fourth transmission gear 64 includes a compression coil spring 66, a washer 67, and a gear cover 23B fixed to the housing 23A. That is, after the washer 67 and the compression coil spring 66 are inserted into the gear rotation shaft 23j provided in the housing 23A of the carriage 23, the fourth transmission gear 64 is rotatably inserted. The gear cover 23B is fixed to the fixing boss 23p provided on the housing 23A of the carriage 23 by a fixing screw 69. The washer 67 is inserted so that the compression coil spring 66 rotates smoothly when the compression coil spring 66 rotates together with the fourth transmission gear 64 that rotates when changing the gap PG.

  With such a configuration, the fourth transmission gear 64 inserted into the gear rotation shaft 23j is suppressed from the side opposite to the compression coil spring 66 by the gear cover 23B so as not to come out of the gear rotation shaft 23j. As a result, the fourth transmission gear 64 is urged against the gear cover 23B by the compression force of the compression coil spring 66, so that rotational torque is generated between the fourth transmission gear 64 and the gear cover 23B. Let

  Accordingly, the casing 23A of the carriage 23 is moved upward away from the upper surface of the second cam member 53, so that the engagement between the second rack 53a and the fourth transmission gear 64 is released. However, the rotation of the fourth transmission gear 64 is suppressed by the cam interlocking mechanism 60 having the rotation suppression structure that generates the rotational torque in this way. As a result, any meshing between the fourth transmission gear 64 and the second rack 53a can be avoided. Since the compression force of the compression coil spring 66 becomes a rotational load in the cam interlocking mechanism 60 when the second cam mechanism 50 is interlocked with the first cam mechanism 40, the fourth transmission gear 64 is connected to the second rack 53a. It is preferable that the rotation is as small as possible within a range in which rotation when the meshing is released can be suppressed.

  As shown in FIG. 3, the sheet P conveyed on the support surface 26 a in which the gap PG with the liquid ejecting head 25 is adjusted by such a position adjusting mechanism PAJ is in the sub-scanning direction Y with respect to the liquid ejecting head 25. The sheet pressing roller 18 provided on the downstream side of the sheet is restrained from floating from the support surface 26a.

Next, the configuration of the paper pressing roller 18 will be described with reference to FIGS.
As shown in FIG. 9A, the paper pressing roller 18 is held in the bearing 81 by inserting the shaft portion 18 j from below into the bearing 81 provided in the holder portion 80. That is, when the locking portion 89 provided in the holder portion 80 is displaced as shown by a two-dot chain line in FIG. 9A when the shaft portion 18j is inserted into the bearing 81, the shaft portion 18j is moved into the bearing 81. After the entry, the shaft portion 18j that has entered after the displacement is returned is held in the bearing 81. In the bearing 81, an upstream inner wall surface 83 and a downstream inner wall surface 82 both extending in a substantially vertical direction are provided with a predetermined interval in the sub-scanning direction Y. The bearing width Jw between the upstream inner wall surface 83 and the downstream inner wall surface 82 is provided such that the shaft portion 18j held in the bearing 81 has a gap Gy in the sub-scanning direction Y. Further, the shaft portion 18j is provided with a gap Gz in the bearing 81 in the vertical direction intersecting the sub-scanning direction Y. In the bearing 81, an inclined surface 85 inclined with respect to the support surface 26a (not shown) is provided on at least a partial region of the region of the bearing width Jw on the inner top surface 84 on the antigravity direction Z side in the vertical direction. Is provided.

  As shown in FIG. 9B, the paper pressing roller 18 of this embodiment includes a rotating body 18b having teeth 18a formed on the outer periphery, and a shaft portion 18j for pivotally supporting the rotating body 18b so as to be driven to rotate. Are integrally formed of a synthetic resin having elasticity. The paper pressing roller 18 contacts the paper P conveyed by the paper discharge roller pair 17 with a pressing force by the elastic force of the shaft portion 18j. For this reason, the paper pressing roller 18 is assembled with the printer 11 so that its forming material and shape (particularly the length and thickness of the shaft portion 18j, etc.) are brought into contact with the conveyed paper P with a desired pressing force. ) Is set.

  Next, the operation of the printer 11 according to the present embodiment will be described with reference to FIGS. FIG. 10 illustrates a case where the inclined surface 85 is not provided on the inner top surface 84 of the bearing 81. Of course, in the present embodiment, a configuration in which the inclined surface 85 is not provided on the inner top surface 84 of the bearing 81 may be employed.

  As shown in FIG. 10, the paper P that has moved on the support surface 26 a (not shown) is nipped by a pair of paper discharge rollers 17 as a conveyance unit and conveyed in the sub-scanning direction Y. At this time, the paper discharge roller pair 17 is provided in the extending direction of the support surface 26a and away from the downstream side in the sub-scanning direction Y and further away from the surface position of the support surface 26a. On the other hand, the paper pressing roller 18 contacts from above the opposite side of the support surface 26a so that the rotating body 18b (tooth portion 18a) presses the paper P against the support surface 26a. Therefore, in a state where the paper P is conveyed in the sub-scanning direction Y by the paper discharge roller pair 17 as indicated by solid line arrows in FIG. 10, the paper pressing roller 18 is nipped between the paper discharge roller pair 17 and conveyed. The sheet P is pressed by contacting the sheet P. As a result, the paper pressing roller 18 generates a pressing force against the paper P, while receiving a pressing force F, which is a reaction force of the pressing force, from the contact portion of the paper P, a state indicated by a two-dot chain line in FIG. To the state shown by the solid line. Thus, the contact state in which the paper pressing roller 18 contacts the paper P to be conveyed is a state in which the paper pressing roller 18 is lifted by the paper P.

  The paper pressing roller 18 is in a state in which the shaft portion 18j lifted in this contact state is in contact with the inner top surface 84 of the bearing 81, and the paper P is rubbed on the support surface 26a without being lifted from the support surface 26a. In order to maintain the state, the sheet P is pressed from above at a predetermined height position from the support surface 26a. In other words, the bearing 81 is disposed at a position where the rotating body 18b keeps the paper P away from the support surface 26a in a state where the shaft portion 18j of the paper pressing roller 18 is in contact with the inner top surface 84. Yes. Furthermore, in this embodiment, in this contact state, the paper pressing roller 18 is moved by the gap Gy in the sub-scanning direction Y and the vertical gap Gz provided between the shaft portion 18j of the paper pressing roller 18 and the bearing 81. The paper P can be smoothly rotated following the conveyance of the paper P. More specifically, the bearing 81 is provided with a bearing width Jw in which a gap is formed in a direction along the conveyance direction of the paper P at the contact portion of the paper P with which the paper pressing roller 18 contacts.

  Now, in the bearing 81 provided with such a bearing width Jw, when the inner top surface 84 is substantially horizontal like the support surface 26a, the paper pressing roller 18 resists the pressing force pressing the paper P. The pressing force F acts in a direction substantially orthogonal to the transport direction of the paper P transported obliquely upward toward the downstream side in the sub-scanning direction Y by the paper discharge roller pair 17. As a result, as shown by the solid line arrow in FIG. 10, the pressing force F acts in a direction inclined with respect to the inner top surface 84 of the bearing 81 with respect to the shaft portion 18j, so that the shaft portion 18j and the inner top surface 84 are in contact with each other. A reversing force Fb that moves the shaft portion 18j in the direction opposite to the conveyance direction of the paper P with the contact point Tp in contact as a fulcrum is generated. On the other hand, as the rotating body 18b that contacts the paper P rotates in the transport direction of the paper P, the contact point Tp that contacts the shaft portion 18j and the inner top surface 84 is used as a fulcrum as shown by the white arrow in FIG. Thus, a forward force FA for moving the shaft portion 18j in the same forward direction as the conveyance direction of the paper P is generated. When both the forward force FA and the reverse force Fb act on the shaft portion 18j, a so-called fluttering phenomenon in which the shaft portion 18j repeatedly moves in the conveyance direction in the range of the bearing width Jw may occur. The shaft portion 18j in which such a fluttering phenomenon is caused may collide with the upstream inner wall surface 83 and the downstream inner wall surface 82 in the bearing 81, thereby generating an undesirable noise (collision noise).

  Therefore, as shown in FIG. 11, in this embodiment, the fluttering phenomenon of the shaft portion 18j is suppressed by the inclined surface 85 provided on the inner top surface 84 of the bearing 81. That is, the inclination angle of the inclined surface 85 provided on the bearing 81 is the inclination angle α with respect to the support surface 26a of the tangent L1 of the paper pressing roller 18 (rotating body 18b) at the contact portion where the paper pressing roller 18 contacts the paper P. Provide an equal angle. That is, the extension line L2 and the tangent line L1 of the inclined surface 85 shown in FIG. In addition, since the tooth | gear part 18a contacts the paper P, the paper pressing roller 18 may have one or more contact portions. For this reason, in this embodiment, the contact portion where the paper pressing roller 18 contacts the paper P is a portion where the outer circumference circle of the rotating body 18b contacts the paper P.

  By providing the inclined surface 85 in this way, when the paper P is conveyed in the sub-scanning direction Y so as to be separated from the support surface 26a, the inclined surface 85 has substantially the same inclination as the conveyance direction of the conveyed paper P. . As a result, the pressing force F from the paper P conveyed obliquely upward toward the downstream side in the sub-scanning direction Y by the paper discharge roller pair 17 is applied to the inclined surface 85 provided on the inner top surface 84 with the shaft portion 18j. On the other hand, it acts in a direction substantially orthogonal.

  Accordingly, the contact point Tp where the shaft portion 18j and the inclined surface 85 (inner top surface 84) contact each other is located on the line of action of the pressing force F, and therefore the shaft portion 18j is moved in the transport direction with the contact point Tp as a fulcrum. The generation of the reverse force Fb that moves in the opposite direction is suppressed. As a result, the rotating portion 18b that contacts the paper P rotates in the shaft portion 18j with the contact point Tp that contacts the shaft portion 18j and the inner top surface 84 as a fulcrum. A forward force FA that moves the paper in the same forward direction as the transport direction of the paper P acts. As a result, as shown by a solid line in FIG. 11, the shaft portion 18j is positioned so as to remain on the downstream side in the transport direction (downstream side in the sub-scanning direction Y) in the bearing width Jw of the bearing 81, and the fluttering phenomenon occurs. Occurrence is suppressed.

  Furthermore, as shown in FIG. 12, in the present embodiment, for example, even when the paper P is conveyed in the direction opposite to the sub-scanning direction Y so as to approach the support surface 26a for double-sided printing, The slanting surface 85 provided on the top surface 84 suppresses the fluttering phenomenon of the shaft portion 18j. That is, as indicated by a broken line arrow in FIG. 12, when the paper P is conveyed in the direction opposite to the sub-scanning direction Y, similarly, the paper discharge roller pair 17 obliquely moves downward toward the upstream side in the sub-scanning direction Y. The shaft portion 18j is pressed against the inclined surface 85 provided on the inner top surface 84 by the pressing force F from the paper P conveyed to the inner surface. Accordingly, in this case, the paper discharge roller pair 17 functions as a transport unit.

  At this time, the inclined surface 85 has substantially the same inclination as the conveyance direction of the conveyed paper P, and the pressing force F from the paper P acts in a direction substantially orthogonal to the inclined surface 85. As a result, the contact point Tp where the shaft portion 18j contacts the inclined surface 85 (inner top surface 84) is located on the line of action of the pressing force F, and therefore the shaft portion 18j is opposite to the transport direction with the contact point Tp as a fulcrum. Generation of the reverse advancing force Fb that moves in the direction (here, the sub-scanning direction Y) is suppressed. Therefore, when the rotating body 18b that contacts the paper P rotates in the transport direction of the paper P, the shaft 18j is supported on the shaft 18j with the contact point Tp that contacts the shaft 18j and the inner top surface 84 as a fulcrum. A forward force FA that moves in the same forward direction as the transport direction of the paper P (here, the direction opposite to the sub-scanning direction Y) acts. As a result, as shown by the solid line in FIG. 12, the shaft portion 18j is positioned so as to remain on the downstream side in the transport direction (upstream side in the sub-scanning direction Y) in the bearing width Jw of the bearing 81. Occurrence is suppressed.

According to the embodiment described above, the following effects can be obtained.
(1) When the paper pressing roller 18 that rotates following the conveyance of the paper P by the paper discharge roller pair 17 receives a pressing force from the contact portion of the paper P and moves, the shaft portion 18j contacts the inclined surface 85. Since the contact portion moves in one direction in the bearing 81 along the inclined surface 85, fluttering phenomenon in which the shaft portion 18j repeatedly moves in the conveyance direction in the bearing 81 is suppressed. Therefore, since the shaft portion 18j rotates stably in the bearing 81, the generation of abnormal noise due to the flapping phenomenon is suppressed.

  (2) Generation of a component force in the direction opposite to the conveyance direction due to the pressing force received from the paper P by the paper pressing roller 18 that rotates following the conveyance of the paper P by the paper discharge roller pair 17 can be suppressed. . Therefore, since the shaft portion 18j rotates stably on one side (conveying direction side) in the bearing 81, generation of abnormal noise due to the flapping phenomenon is suppressed.

  (3) When the paper P is transported in both forward and reverse directions of the transport direction, the pressing force received from the paper P by the paper pressing roller 18 that rotates following the transport of the paper P is the transport force in any direction. The shaft portion 18j is pressed in a direction substantially orthogonal to the inclined surface 85. Accordingly, in any transport direction, generation of a component force in the direction opposite to the transport direction is suppressed with respect to the shaft portion 18j that abuts the inclined surface 85 by the pressing force received from the paper P. As a result, when the paper P is transported in both directions, the shaft portion 18j moves to the transport direction side of the paper P in the bearing 81, thereby stabilizing on one side (transport direction side) in the bearing 81. Generation of noise due to flapping is suppressed.

  (4) The shaft portion 18j comes into contact with the inclined surface 85 when moving in the region of the bearing width Jw. Then, the contact with the inclined surface 85 rotates while suppressing movement in the direction opposite to the conveyance direction, so that the generation of abnormal noise due to flapping is suppressed.

  (5) In the recording apparatus having the support base 26 in which the support surface 26a of the paper P is a horizontal surface, the paper pressing roller 18 is stably rotated when the paper P discharged from the support surface 26a is conveyed. As a result, the printer 11 in which the generation of abnormal noise due to flapping is suppressed is obtained.

The above embodiment may be changed to another embodiment as described below.
In the above embodiment, the inclined surface 85 provided on the bearing 81 has an inclination angle larger than the inclination angle α with respect to the support surface 26a of the tangent line of the paper pressing roller 18 at the contact portion where the paper pressing roller 18 contacts the paper P. It may be provided.

  As shown in FIG. 13, in the present modification, the inner top surface 84 of the bearing 81 is directed to the downstream side in the sub-scanning direction Y, which is the conveyance direction of the paper P, from the conveyance direction of the paper P being conveyed. Further, the inclined surface 85 is formed with a large inclination angle with respect to the support surface 26a so as to be further advanced. When the inner top surface 84 is an inclined surface 85 having a large inclination angle as described above, the pressing force F received by the paper pressing roller 18 from the paper P is rotated at the contact portion where the paper pressing roller 18 contacts the paper P. Since it acts in a direction substantially perpendicular to the tangential direction of the body 18b, it acts to press the shaft portion 18j in a direction inclined with respect to the inclined surface 85 as shown in FIG. As a result, the pressing force F generates a forward force Fa that moves the shaft portion 18j in the transport direction of the paper P with a contact point Tp at which the shaft portion 18j and the inner top surface 84 (inclined surface 85) contact each other as a fulcrum. Let On the other hand, when the rotating body 18b that contacts the paper P rotates in the transport direction of the paper P, the shaft portion 18j is used as a paper with the contact point Tp contacting the shaft portion 18j and the inner top surface 84 (inclined surface 85) as a fulcrum. A forward force FA that moves in the same forward direction as the conveyance direction of P is generated. Therefore, when the two forward forces Fa and forward force FA act on the shaft portion 18j, the shaft portion 18j is stably positioned in the conveyance direction side of the paper P in the bearing 81.

According to this modification, the following effect is obtained instead of the effect (3) in the above embodiment.
(6) Since the inclined surface 85 is provided with an inclination angle larger than the inclination angle α with respect to the support surface 26a of the tangent of the rotating body 18b at the contact portion where the paper pressing roller 18 contacts the paper P, the paper pressing roller 18 Can be generated with a high probability by the pressing force F received from the paper P by moving the shaft portion 18j on the inclined surface 85 toward the conveyance direction. Therefore, by suppressing the generation of the component force in the direction opposite to the conveyance direction side, the shaft portion 18j rotates stably on one direction side (conveyance direction side) in the bearing 81. Is suppressed.

  In the above embodiment, the holder portion 80 may be provided with the angle adjustment mechanism KAJ that can adjust the inclination angle formed by the inclined surface 85 of the bearing 81 and the support surface 26a. An example of this modification will be described with reference to the drawings.

  As shown in FIG. 14, the bearing 81 of this modification is provided on a bearing body 88 that is rotatably attached to the holder portion 80. That is, the bearing body 88 has a substantially cylindrical shape with an opening provided on the lower side, and a bearing 81 having the opening as a bearing width Jw is formed at a substantially central portion of the cylindrical shape. And the bearing 81 rotates centering on the axis line along the main scanning direction X by moving the lever part 88a in which a part member protruded outward from the cylindrical outer peripheral part.

  Therefore, for example, when the user of the printer 11 moves the lever portion 88a to rotate the bearing body 88, the inclination angle of the inclined surface 85 provided on the inner top surface 84 of the bearing 81 with respect to the support surface 26a is adjusted. It is possible. That is, the holder part 80 and the bearing body 88 function as the angle adjustment mechanism KAJ. Of course, the lever 88a may be moved and the bearing body 88 may be rotated using a driving force from a driving source (not shown).

According to this modification, the following effects are obtained in addition to the effects (1) to (5) in the embodiment and the effect (6) in the modification.
(7) By the angle adjustment mechanism KAJ, for example, an inclination angle α formed by the tangent of the rotating body 18b at the contact point where the paper pressing roller 18 contacts the paper P and the support surface 26a is the paper conveyed by the paper discharge roller pair 17 When it fluctuates according to P, it is possible to adjust the inclination angle of the inclined surface 85 of the bearing 81 so as to match the changed angle. Therefore, since the shaft portion 18j rotates stably in the bearing 81, generation of abnormal noise due to flapping is suppressed.

  In the above embodiment, the shape of the inclined surface 85 formed on the inner top surface 84 of the bearing 81 may of course be another shape. This modification will be described with reference to the drawings. Here, the description of the pressing force F received by the shaft 18j from the conveyed paper P and the direction of action thereof will be omitted.

  As shown in FIG. 15A, the inner top surface 84 of the bearing 81 has a first inclined surface 85a whose downstream side in the sub-scanning direction Y descends toward the sub-scanning direction Y, and whose upstream side in the sub-scanning direction Y is upstream. It is good also as a bending surface which is the 2nd inclined surface 85b which goes up toward the subscanning direction Y. As shown in FIG. Therefore, a bent portion 86 having a valley shape is formed at a connection portion between the first inclined surface 85a and the second inclined surface 85b in the inner top surface 84.

  In the bearing 81 having such a bent surface, when the paper P is conveyed in the sub-scanning direction Y, the shaft portion 18j is brought into contact with the first inclined surface 85a, and the second inclined surface 85b is caused by the reverse advancing force generated. Move to the side. When the shaft portion 18j comes into contact with the second inclined surface 85b, a forward force is generated and the shaft portion 18j moves to the first inclined surface 85a side. Therefore, the shaft portion 18j is positioned in the vicinity of the bent portion 86 as shown by a two-dot chain line in FIG. As a result, the flutter width is suppressed, and the collision with the bearing 81 (downstream inner wall surface 82 and upstream inner wall surface 83) in the transport direction is suppressed. The same applies to the case where the paper P is transported in the direction opposite to the sub-scanning direction Y, and the description thereof is omitted here.

  Alternatively, as shown in FIG. 15 (b), the inner top surface 84 of the bearing 81 is a first inclined surface 85 a that rises in the sub-scanning direction Y toward the sub-scanning direction Y, and the sub-scanning direction Y The upstream side may be a bent surface that is the second inclined surface 85b that is inclined downward in the sub-scanning direction Y. Therefore, a bent portion 87 having a mountain shape is formed at a connection portion between the first inclined surface 85a and the second inclined surface 85b on the inner top surface 84.

  In the bearing 81 having such a bent surface, when the paper P is conveyed in the sub-scanning direction Y, the first inclined surface 85a is caused by the forward force generated by the shaft portion 18j coming into contact with the first inclined surface 85a. Along the sub-scanning direction Y side and abut against the downstream inner wall surface 82. And the state which axial part 18j contact | abutted to the downstream inner wall surface 82 is maintained. Conversely, when the paper P is transported in the direction opposite to the sub-scanning direction Y, the shaft portion 18j first contacts the second inclined surface 85b by moving in the transport direction. Then, the shaft portion 18j is moved in the transport direction opposite to the sub-scanning direction Y along the second inclined surface 85b by the forward force generated by the contact with the second inclined surface 85b, and the upstream inner wall surface. 83 abuts. And the state which axial part 18j contact | abutted to the upstream inner wall surface 83 is maintained.

  Accordingly, as shown by a solid line and a two-dot chain line in FIG. 15B, the shaft portion 18j is stably maintained at one of the two positions over the bent portion 87 according to the transport direction. As a result, fluttering is suppressed and frequent collisions with the bearing 81 in the transport direction are suppressed.

  In the above embodiment, the support surface 26a of the support base 26 does not necessarily have to be a horizontal plane extending in the horizontal direction intersecting the vertical direction. In the bearing 81, the support surface 26 a is inclined from the horizontal as long as the shaft portion 18 j is lifted toward the inner top surface 84 by the pressing force F received by the paper pressing roller 18 from the paper P. Of course, there is no problem.

  In the above embodiment, the printer 11 does not necessarily include the position adjustment mechanism PAJ that adjusts the position of the carriage 23 to adjust the distance between the paper P and the liquid ejecting head 25. For example, when printing is always performed on the paper P having a constant thickness, the position adjustment mechanism is unnecessary.

  In the above embodiment, the carriage 23 (housing 23A) may be configured such that the height position of the first cam mechanism 40 and the second cam mechanism 50 can be adjusted in two steps, three steps, or five steps or more. Good. Or you may make it adjust the height of the carriage 23 (housing | casing 23A) with the cam mechanism of a different structure from the 1st cam mechanism 40 or the 2nd cam mechanism 50 of the said embodiment.

  In the above-described embodiment, the liquid ejecting head 25 is not limited to a so-called serial head type that ejects liquid by reciprocating with the carriage 23 in a direction intersecting the transport direction of the paper P. That is, in the state in which the length size forms an overall shape corresponding to the width size of the paper P and the longitudinal direction thereof is fixedly arranged so as to be along the width direction intersecting the transport direction of the paper P, substantially the entire longitudinal direction thereof It may be a so-called line head type in which liquid is ejected from a large number of nozzles provided so as to extend toward the medium.

  In the above embodiment, the supply source of the ink that is the liquid ejected from the liquid ejecting head 25 may be other than the so-called on-carriage type ink cartridge EK mounted on the carriage 23. For example, a so-called off-carriage type ink container provided inside the main body case 12 of the printer 11 and at a place other than the carriage 23 may be used. Alternatively, it may be a so-called external type ink container provided outside the main body case 12. In this way, the ink capacity when the ink container provided outside the carriage 23 is used, compared to the case of the ink cartridge EK, which is a type that is mounted on the carriage 23 and has a limited ink capacity. Therefore, it is possible to eject more ink.

  When ink is supplied from the ink container provided outside the main body case 12 to the liquid jet head 25 inside the main body case 12, an ink supply tube for supplying ink is connected from the outside of the main body case 12. Must be routed inside. Therefore, in this case, it is preferable to provide a hole or a notch through which the ink supply tube can be inserted in the main body case 12. Alternatively, the main body case 12 is provided with a restricting member such as a boss that prevents the open / close body such as the image reading unit (scanner unit) 15 and the operation panel 13 provided in the main body case 12 to be opened and closed completely with respect to the main body case 12. The ink supply tube may be routed from the outside to the inside of the main body case 12 through a gap formed by the regulating member. In this way, ink can be easily supplied to the liquid ejecting head 25 using the ink flow path of the ink supply tube.

In the above embodiment, instead of the paper P, a plastic film, cloth, metal foil, or the like may be used as a target.
In the above embodiment, the recording apparatus is not limited to the printer 11, but other fluids other than ink (liquids, liquids in which particles of functional materials are dispersed or mixed, liquids such as gels, It may be a fluid ejecting apparatus that performs recording by ejecting or ejecting (including a solid that can be ejected by flowing as a fluid). For example, recording is performed by ejecting a liquid material in which a material such as an electrode material or a color material (pixel material) used for manufacturing a liquid crystal display, an EL (electroluminescence) display, and a surface emitting display is dispersed or dissolved. A liquid ejecting apparatus may be used. Also, a fluid injection device for injecting a fluid such as a gel (eg, physical gel), a powder injection device (eg, a toner jet type) for injecting a solid such as powder (particles) such as toner Recording device). The present invention can be applied to any one of these fluid ejecting apparatuses. In the present specification, the term “fluid” is a concept that does not include a fluid consisting only of gas. Examples of the fluid include liquid (inorganic solvent, organic solvent, solution, liquid resin, liquid metal (metal melt), etc. ), Liquids, fluids, powders (including granules and powders), and the like.

  DESCRIPTION OF SYMBOLS 11 ... Printer (an example of a recording device), 16 ... Paper feed roller pair (an example of a conveyance part), 17 ... Discharge roller pair (an example of an output part), 18j ... Shaft part, 26 ... Support stand (An example of a support part) ), 26a ... support surface, 80 ... holder portion, 81 ... bearing, 85 ... inclined surface, .alpha .... inclination angle, Gy, Gz ... gap, Jw ... bearing width, KAJ ... angle adjustment mechanism, L1 ... tangent, P ... paper (Example of medium).

Claims (5)

A recording unit for recording on the conveyed medium;
A support portion disposed opposite to the recording portion and having a support surface for supporting the medium;
A transport roller for transporting the medium toward the recording unit;
Discharging the recorded medium from the support, and a discharge roller in which a contact portion with the medium is positioned above the support;
A driven roller that is positioned between the discharge roller and the support portion, contacts the medium to be discharged from the side opposite to the support portion, and is driven to rotate following the discharge of the medium;
A holder portion having a bearing that rotatably supports the shaft portion of the driven roller;
With
The bearing has a top surface that is pressed against the shaft portion of the driven roller by the driven roller coming into contact with the medium;
In the state where the medium is supported by the support unit, conveyed to the discharge roller, and in contact with the driven roller,
Connecting the before SL driven roller the support portion, a first surface on which the medium is formed,
Connecting said discharge roller over the previous SL driven roller, and a second surface on which the medium is formed,
Formed,
The recording apparatus according to claim 1, wherein the top surface has an inclined surface having an inclination angle equal to or larger than an angle formed by the first surface and the second surface . The recording apparatus according to claim 1, wherein the inclined surface provided on the bearing has an inclination angle larger than an angle formed by the first surface and the second surface . The recording apparatus according to claim 1, wherein the inclined surface provided on the bearing has an angle equal to an angle formed by the first surface and the second surface .   4. The recording apparatus according to claim 1, wherein the inclined surface is provided in at least a partial region of the bearing width region in the bearing. 5.   The recording apparatus according to claim 1, wherein the support surface of the support portion is a horizontal plane extending in a horizontal direction intersecting a vertical direction.