JP2017124637A - Liquid jet device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid jet device which, in a case with a risk of generating dust from an edge of a recording medium, can prevent the dust from adhering to a liquid jet head.SOLUTION: A liquid jet device includes: a transport roller 12 which, in a state where a recording paper sheet P is held between a pair of rollers 12a and 12b capable of holding the recording paper sheet from both front and rear sides thereof, transports the recording paper sheet to between a nozzle forming surface 22a of a recording head 22 and a support member 30 from an upstream side in a transport direction by rotating the rollers; and a receiving member 41 which is provided so as to take at least a position state where a holding position is to be on a nozzle forming surface side with respect to an edge on an upstream side in the transport direction of the recording paper sheet passing from the upstream side to a downstream side in the transport direction, at a receiving position which is between a holding position of the recording paper sheet by the rollers in a transport path for the recording paper sheet and a facing position where the recording paper sheet faces the nozzle forming surface on the support member, and is between the support member and the nozzle forming surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a liquid ejecting apparatus that ejects liquid onto, for example, a paper recording medium.

  As an example of a liquid ejecting apparatus that ejects liquid onto a recording medium, an ink jet printer that ejects ink that is liquid onto recording paper serving as a recording medium is known. The ink jet printer includes a liquid ejecting head having a nozzle forming surface on which a plurality of nozzles are formed, and a support member that supports the recording paper in a state of facing the nozzle forming surface of the liquid ejecting head. Further, the ink jet printer includes a transport roller for transporting the recording paper from the upstream side in the transport direction to a facing position where the recording medium faces the nozzle forming surface on the support member. A conveyance roller is comprised by the conveyance drive roller connected with the conveyance motor, and the conveyance driven roller which is arrange | positioned so as to oppose a conveyance drive roller, and can be driven rotated.

  The recording paper is transported to the upper surface of the support member by rotating the transport driving roller from the state of being sandwiched between the transport driving roller and the driven drive roller by the transport motor being rotated. Then, when the recording medium conveyed to the upper surface of the support member reaches a position facing the nozzle forming surface, ink droplets are ejected from the nozzles of the liquid ejecting head to the recording paper, thereby Printing is performed.

  By the way, when the recording paper is transported to the upper surface of the support member, the rear end, which is the upstream end of the recording paper in the transport direction, passes between the transport driving roller and the driven driving roller to the downstream side, and both rollers Since the restraint state due to the sandwiching of the two rollers on the recording paper is released away from the recording paper, the rear end portion of the recording paper may jump up vigorously toward the front end side of the recording paper. Here, since the rear end of the recording paper is a cut surface formed by forcibly cutting the paper fiber, if the rear end of the recording paper jumps up vigorously, dust is removed from the cut surface at the rear end of the recording paper. There is a risk that a kind of paper powder will be scattered. When paper dust that scatters is generated, the scattered paper powder floats around the recording paper and a part of the paper dust adheres to the vicinity of the nozzle, resulting in the flight of ink droplets ejected from the nozzle. The nozzle direction is changed, or nozzle clogging occurs such that the nozzle is blocked by paper dust.

  Therefore, in Patent Document 1, in order to prevent the scattered paper dust from adhering to the nozzle, it is provided between the transport roller (the feeding means in Patent Document 1) and the liquid ejecting head (the recording means in Patent Document 1). It has been proposed to remove the paper dust adhering to the recording paper before the recording paper is transported to the upper surface of the support member by the neutralizing needle member. According to this, before the recording paper is transported to the upper surface of the support member, the surface of the recording paper is rubbed with a certain strength so that the paper dust attached to the recording paper is forcibly removed and transported. It is suppressed that paper dust is scattered from the recording paper and adheres to the nozzle forming surface.

  Further, in Patent Document 2, the metal plate constituting the nozzle forming surface of the liquid jet head is set to the ground potential, the support member (the metal guide for conveyance in Patent Document 2) is made of metal, and the support member has a negative electrode. It has been proposed to generate an electric field between the liquid jet head and the support member by applying a direct current direct voltage, and to draw the paper dust to the support member side by this electric field. According to this, the paper dust does not move to the nozzle forming surface side, and the paper dust scattered from the recording paper is suppressed from adhering to the nozzle forming surface.

  Further, Patent Document 3 proposes that air is blown toward the recording paper in the oblique forward direction of the recording sheet by a fan provided in the carriage that moves the liquid ejecting head. According to the apparatus described in Patent Document 3, since the carriage moves toward a region where air is blown, that is, a region where scattered paper dust is blown off by air, the paper dust scattered from the recording paper is reduced. Adhesion to the nozzle forming surface is suppressed.

JP-A-10-147035 JP 2003-220695 A Japanese Patent Laid-Open No. 2003-118095

  However, in Patent Document 1, paper dust is generated when the static elimination needle member rubs the surface of the recording paper, and the generated paper powder may be scattered. Further, in Patent Document 2, when the recording paper supply / discharge speed is high, an air flow is generated by the rotation of the conveyance driven roller, and the paper dust is blown off by the air flow, and the paper dust is moved to the support member side by the electric field. There is a risk that it will be difficult to attract. Furthermore, in Patent Document 3, paper dust is blown off by air, and the blown-off paper dust may float around the recording paper and adhere to the nozzle formation surface. Thus, there is still room for improvement in suppressing printing defects on recording paper.

  The present invention has been made in view of such circumstances, and its purpose is to prevent such dust from adhering to the liquid jet head when dust may be generated from the end of the recording medium. An object of the present invention is to provide a liquid ejecting apparatus that can be suppressed.

  In order to achieve the above object, a liquid ejecting apparatus of the present invention includes a liquid ejecting head having a nozzle forming surface on which nozzles for ejecting liquid to a recording medium are formed, and the recording medium is opposed to the nozzle forming surface. In addition, the recording medium is sandwiched between a support portion that can be supported in a state spaced from the nozzle forming surface and a pair of rotating bodies that can sandwich the recording medium from both front and back sides. A transport unit configured to transport the recording medium from the upstream side in the transport direction to the space between the nozzle formation surface and the support unit by rotating the rotating body; and disposed downstream of the nozzle formation surface in the transport direction, A pair of downstream rotating bodies capable of sandwiching the recording medium from both the front and back sides, and a position where the recording medium is sandwiched by the rotating bodies in the transport direction so as to be in contact with the surface of the transported recording medium A wall portion is provided at a position between the nozzles and linearly extends from the clamping position side toward the nozzle forming surface, and is spaced along a direction intersecting the transport direction. A plurality of receiving members, and the receiving members cover the upper part of the pair of rotating bodies from the upstream side in the transport direction from the clamping position, and the extending portions and the wall portions. And a curved portion that is connected to the upstream side in the transport direction from the clamping position, and the curved portion is provided so as to be continuous with the surface of the wall portion on the support portion side. A receiving portion for receiving the recording medium is provided before the surface comes into contact with the surface of the wall portion.

  According to the present invention, the upstream end of the recording medium in the transport direction when the end of the upstream of the recording medium in the transport direction passes through the holding position between the rotating bodies to the downstream side and the restrained state is released. Is received by the receiving member.

  In the liquid ejecting apparatus of the invention, the receiving member may be formed of a resin material.

  In the liquid ejecting apparatus according to the aspect of the invention, the receiving member may be conductive and grounded.

  According to this invention, the friction generated between the recording medium and the receiving member when the end on the upstream side in the conveying direction of the recording medium moves in the conveying direction while being in sliding contact with the surface on the support portion of the receiving member. Therefore, the receiving member can be prevented from being charged.

  In the liquid ejecting apparatus according to the aspect of the invention, the receiving member may swing so that a gap between the support portion and the wall portion changes.

  In the liquid ejecting apparatus according to the aspect of the invention, the distance between the outermost ends of the receiving members that are both ends in the direction intersecting the transport direction among the plurality of receiving members provided intersects the transport direction of the recording medium. It may be longer than the length in the direction.

  In the liquid ejecting apparatus according to the aspect of the invention, the wall portion is disposed so as to form a gap at a position closer to the support portion than a surface including the nozzle formation surface in a direction in which the nozzle formation surface and the support portion face each other. May be.

    Delete

(A) is a schematic diagram which shows schematic structure of the inkjet printer in embodiment, (b) is the top view which looked at the inkjet printer from the top. (A) is a schematic diagram showing a state in which the front end of the recording paper passes through the nipping position, (b) is a schematic diagram showing a state in which the front end of the recording paper passes through the nipping position and the rear end before passing through, (c). Is a schematic diagram showing a state in which the rear end portion of the recording sheet is bounced up and in contact with the curved portion, (d) is a schematic diagram showing a state in which the rear end portion of the recording sheet is in contact with the oblique wall portion, and (e). FIG. 6 is a schematic diagram showing a state in which the rear end portion of the recording sheet is moving while being in sliding contact with the oblique wall portion, and FIG.

Hereinafter, an embodiment in which the present invention is embodied in an ink jet printer which is a kind of liquid ejecting apparatus will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1A, the ink jet printer includes a transport roller 12 and a paper discharge roller 13 for transporting a recording paper P as a recording medium. Each of these rollers 12 and 13 is formed in a columnar shape, and is disposed so as to be rotatable about its center as a rotation axis.

  The transport roller 12 includes a transport driving roller 12a and a transport driven roller 12b as a pair of rotating bodies that can sandwich the recording paper P from both the front and back sides. The transport driving roller 12a is connected to the transport motor M1, and the transport driven roller 12b is disposed so as to face the transport driving roller 12a and can be driven to rotate. The paper discharge roller 13 is composed of a paper discharge driving roller 13a and a paper discharge driven roller 13b as a pair of rotating bodies capable of sandwiching the recording paper P from both the front and back sides. The paper discharge driving roller 13a is connected to the conveyance motor M1, and the paper discharge driven roller 13b is disposed so as to face the paper discharge driving roller 13a so as to be driven to rotate (in FIG. The power transmission path of the motor M1 is indicated by a broken line).

  In the transport roller 12 and the paper discharge roller 13, the transport drive roller 12a and the paper discharge drive roller 13a are rotationally driven by the transport motor M1, so that the transport driven roller 12b and the paper discharge driven roller 13b cooperate to perform recording. The paper P is fed and discharged. Therefore, in the present embodiment, the transport unit is configured by the transport roller 12 and the paper discharge roller 13. The direction in which the recording paper P is transported is hereinafter referred to as a transport direction.

  Further, above the recording paper P conveyed between the conveying roller 12 and the paper discharge roller 13, a carriage 20 on which an ink cartridge is mounted is provided so as to be movable in a direction perpendicular to the paper surface, that is, in the scanning direction. . The carriage 20 is connected to the carriage motor M2 via a timing belt, and is reciprocated by driving the carriage motor M2 (in FIG. 1A, the power transmission path of the carriage motor M2 is shown by a broken line). In addition, a recording head 21 as a liquid ejecting head is mounted on the carriage 20. On the lower surface of the recording head 21, there is provided a nozzle plate 22 on which a number of nozzles (not shown) for ejecting ink droplets downward are formed. The nozzle plate 22 is grounded to suppress the charging.

  A support member 30 that supports the recording paper P is disposed below the recording paper P that is transported between the transport roller 12 and the paper discharge roller 13. The upper surface of the support member 30 is formed into a flat surface. The upper surface of the support member 30 is a support surface 31 that supports the recording paper P in a state of facing the nozzle forming surface 22 a that is the lower surface of the nozzle plate 22. In addition, an area above the support member 30, an area sandwiched between an end portion of the support member 30 at the rear (upstream side) in the transport direction and an end portion of the support member 30 at the front (downstream side) in the transport direction, Hereinafter, the printing area R is assumed.

  On the transport path on which the recording paper P is transported, the rear end (end on the upstream side in the transport direction) of the recording paper P passes between the transport driving roller 12a and the transport driven roller 12b and transports downstream. A receiving member 41 is provided at a position away from the roller 12. When the rear end of the recording paper P is released from the restrained state held by the conveying roller 12 and jumps to the front end side, the receiving member 41 has the surface of the recording paper P (on the recording head 21 side of the recording paper P). Surface), which is made of a conductive metal material and grounded.

  The receiving member 41 includes an extending portion 41a that covers the transport driving roller 12a from above and extends linearly along the transport direction. Further, the receiving member 41 includes a curved portion 41b that is continuous with the end portion of the extending portion 41a on the recording head 21 side and is curved so as to bulge toward the support roller 30 and swell toward the conveying roller 12 side. Further, the receiving member 41 includes an inclined wall portion 41c that is continuous with the end portion on the recording head 21 side of the curved portion 41b and that extends linearly toward the nozzle forming surface 22a side away from the conveying roller 12.

  As shown in FIG. 1B, the lengths L1 along the width direction orthogonal to the conveyance direction of the recording paper P in the extending portion 41a, the curved portion 41b, and the oblique wall portion 41c are the same. In addition, the length L1 along the width direction of the extending portion 41a, the curved portion 41b, and the inclined wall portion 41c is slightly longer than the length L2 along the width direction of the recording paper P. The extending part 41a, the curved part 41b, and the oblique wall part 41c are formed so as to continuously extend along the width direction.

  As shown in FIG. 1A, the bending portion 41b has a trailing end of the recording paper P that is separated from the downstream side from between the conveyance driving roller 12a and the conveyance driven roller 12b, and the trailing edge of the recording paper P jumps up. The curved portion 41b is in contact with the rear end portion of the recording paper P and is provided at a position where the rear end portion of the recording paper P can take a position state on the nozzle forming surface 22a side. . The inclined wall portion 41 c is formed in a surface shape that is inclined so that the surface on the support member 30 side approaches the nozzle forming surface 22 a side by a predetermined angle θ from the direction along the support surface 31 of the support member 30. .

  A rotating roller 42 is attached to the end portion of the extending portion 41a opposite to the recording head 21. The rotating roller 42 is connected to the motor M3 and rotated through the driving of the motor M3 (in FIG. 1A, the power transmission path of the motor M3 is indicated by a broken line). Due to the rotation of the rotating roller 42, the receiving member 41 can swing along the circumferential direction of the rotating roller 42.

  Here, the position of the receiving member 41 when the extending portion 41a extends in parallel along the transport direction is set such that the rear end portion of the receiving member 41 is curved when the rear end portion of the recording paper P jumps up to the front end side. It is set as a receiving position where can be received. The receiving position is between a holding position where the recording paper P is held between the transport driving roller 12a and the transport driven roller 12b, and a position where the recording paper P faces the nozzle forming surface 22a on the support member 30. And it is located between the support member 30 and the nozzle formation surface 22a. When the receiving member 41 is positioned at the receiving position, a gap through which the recording paper P can pass is provided between the portion between the curved portion 41b and the inclined wall portion 41c and the support surface 31 of the support member 30. Is formed.

  On the other hand, the position of the receiving member 41 when the rotating roller 42 rotates and the receiving member 41 swings and the extending direction of the extending portion 41a extends obliquely upward toward the recording head 21 side is the recording paper. An avoidance position where the front end Pf, which is an end portion on the downstream side in the conveyance direction of the recording paper P, starts to interfere with the receiving member 41 when the conveyance of P is started is set. The receiving member 41 is movable between the receiving position and the avoidance position by the rotation of the rotating roller 42.

  In the printer configured as described above, when printing the recording paper P, first, as shown in FIG. 2A, when the transport motor M1 is driven and the transport drive roller 12a rotates, the transport driven roller 12b rotates. At the same time, the front end Pf side of the recording paper P is sandwiched between the transport driving roller 12a and the transport driven roller 12b. Then, the recording paper P is conveyed toward the support surface 31 of the support member 30 while being sandwiched between the conveyance drive roller 12a and the conveyance driven roller 12b by the rotation of the conveyance drive roller 12a and the conveyance driven roller 12b. . At this time, the receiving member 41 is moved to the avoidance position by the rotation of the rotating roller 42.

  Next, as shown in FIG. 2B, when the front end Pf of the recording paper P passes through the clamping position and is conveyed onto the support surface 31 of the support member 30, the receiving member 41 moves to the receiving position. Thus, the rotation roller 42 rotates and the receiving member 41 is positioned at the receiving position.

  Next, as shown in FIG. 2C, when the recording paper P is further transported and the rear end of the recording paper P is separated from between the transport driving roller 12a and the transport driven roller 12b, the recording paper P is transported. The restraint between the driving roller 12a and the transport driven roller 12b is released, and the rear end portion of the recording paper P jumps up toward the front end side of the recording paper P. The rear end portion of the recording paper P that has jumped up is received in contact with the curved portion 41b. Further, when the recording paper P is transported, the rear end portion of the recording paper P moves while sliding on the surface of the curved portion 41b on the transporting roller 12 side. As shown in FIG. 2D, the rear end portion of the recording paper P has a gap between the portion between the curved portion 41 b and the inclined wall portion 41 c and the support surface 31 of the support member 30. Via the support member 30 side surface of the inclined wall portion 41c.

  Next, as shown in FIG. 2E, the rear end portion of the recording paper P moves while sliding along the surface of the inclined wall portion 41c on the support member 30 side. As the trailing edge of the recording paper P moves while sliding along the surface of the inclined wall 41c on the support member 30 side, the amount of jump at the trailing edge of the recording paper P gradually increases. However, the force at which the trailing end portion of the recording paper P tries to jump up is that the end portion is in sliding contact with the surface on the support member 30 side of the inclined wall portion 41c so that the contact force gradually becomes gentle. It gradually decreases.

  As shown in FIG. 2 (f), when the trailing edge of the recording paper P moves away from the inclined wall portion 41c, the force to jump up at the trailing edge of the recording paper P is attenuated. The paper P does not jump up vigorously, and the rear end of the recording paper P is gently separated from the oblique wall 41c. While the recording paper P reaches the position where the recording paper P and the nozzle forming surface 22a are opposed to each other in the printing region R while being supported by the support surface 31 of the support member 30, the trailing edge of the recording paper P that has jumped up is gravity. Thus, the original shape before splashing is restored, and ink droplets are ejected from each nozzle of the recording head 21 to print on the recording paper P. Further, the recording paper P printed by the paper discharge driving roller 13a and the paper discharge driven roller 13b is discharged. In this way, the recording paper P is sequentially printed while being conveyed from the upstream side to the downstream side.

In the above embodiment, the following effects can be obtained.
(1) A receiving member 41 is provided at a position on the transport path along which the recording paper P is transported and where the recording paper P is separated from between the transport driving roller 12a and the transport driven roller 12b. Therefore, when the rear end portion of the recording paper P passes the clamping position between the transport driving roller 12a and the transport driven roller 12b to the downstream side and the restrained state is released, the rear end portion of the recording paper P jumped up is received. Since it is received by the member 41, it does not collide with the nozzle forming surface 22a. Therefore, when there is a possibility that paper dust, which is a kind of dust, is generated from the rear end portion of the recording paper P, it is possible to suppress such paper dust from adhering to the nozzle forming surface 22a.

  (2) The receiving member 41 includes the inclined wall portion 41c that extends linearly toward the nozzle forming surface 22a side so as to move away from the transport roller 12, and the surface of the inclined wall portion 41c on the support member 30 side. Is formed in a surface shape inclined so as to approach the nozzle forming surface 22a side. Therefore, the rear end portion of the recording paper P that has passed downstream of the nipping position between the transport driving roller 12a and the transport driven roller 12b is in sliding contact with the surface of the inclined wall portion 41c on the support member 30 side. In this state, it moves to the downstream side in the transport direction. For this reason, the force of jumping up at the rear end portion of the recording paper P is slidably contacted so that the abutting force gradually decreases with respect to the surface of the inclined wall portion 41c on the support member 30 side. When the end portion gradually decreases and the end portion moves away from the inclined wall portion 41c, the force of jumping up at the end portion is attenuated. As a result, it is possible to effectively suppress the scattering of paper dust caused by the trailing edge of the recording paper P jumping up, and to favorably suppress the paper dust from adhering to the nozzle forming surface 22a.

  (3) The receiving member 41 is provided so as to continuously extend along the width direction of the recording paper P, and the length L1 along the width direction of the receiving member 41 is a length along the width direction of the recording paper P. It is longer than L2. For example, when a plurality of receiving members are provided intermittently at a certain interval along the width direction of the recording paper P, the rear end portion of the recording paper P jumps up and is received by each of the receiving members. There is a possibility that the paper dust scattered at that time passes between the receiving members and floats toward the nozzle forming surface 22a. In this respect, in the present embodiment, the receiving member 41 has a length L1 in the width direction that is longer than the rear end portion of the recording paper P. Therefore, paper dust generated when the receiving member 41 is received by the receiving member 41 forms nozzles. It is possible to suppress floating toward the surface 22a side.

  (4) The receiving member 41 is made of a conductive metal material and is grounded. Therefore, when the recording paper P moves in the transport direction in a state in which the rear end portion of the recording paper P is in sliding contact with the surface of the inclined wall portion 41c on the support member 30 side, the recording paper P and the inclined wall portion 41c are moved. It is possible to suppress the receiving member 41 from being charged due to the friction generated by the above. Therefore, it is possible to prevent the receiving member 41 from being charged and an electric field is formed between the receiving member 41 and the recording head 21, and the paper powder being guided toward the nozzle forming surface 22 a side by the electric field. it can.

  (5) The receiving member 41 is movable between the receiving position and the avoidance position by the rotation of the rotating roller 42. Therefore, if the receiving member 41 has moved from the receiving position to the avoidance position when the front end Pf of the recording paper P has passed the holding position between the transport driving roller 12a and the transport driven roller 12b downstream, the recording paper P The front end Pf does not interfere with the receiving member 41. Therefore, it is possible to suppress the paper powder from scattering from the front end Pf of the recording paper P due to interference between the front end Pf of the recording paper P and the receiving member 41.

  (6) The inclined wall portion 41c is formed to extend linearly toward the nozzle forming surface 22a side so as to move away from the transport roller 12. Therefore, for example, when the recording paper P is transported from the discharge roller 13 side to the transport roller 12 side during double-sided printing, the front end side of the recording paper P on the transport roller 12 side is the support member 30 side of the oblique wall portion 41c. It is conveyed so that it may be guided along the surface. Therefore, it is possible to suppress the front end side of the recording paper P on the conveying roller 12 side from interfering with the inclined wall portion 41c, and it is possible to perform duplex printing smoothly.

The above embodiment may be changed to another embodiment as described below.
In the embodiment, the receiving member 41 may not be able to move from the receiving position to the avoidance position. That is, the rotating roller 42 may be deleted. Even in this case, since the receiving member 41 includes the curved portion 41b, even if the front end Pf of the recording paper P interferes with the receiving member 41 when the recording paper P is conveyed, It moves so that the front end Pf of the recording paper P is guided along the surface on the conveying roller 12 side. Therefore, the front end Pf of the recording paper P can pass through the gap between the portion between the curved portion 41b and the inclined wall portion 41c and the support surface 31 of the support member 30, and the recording paper P is received. Interference with the member 41 and occurrence of a paper jam can be suppressed.

  -In embodiment, even if it is formed in the curved shape bulging to the support member 30 side so that it may approach the nozzle formation surface 22a side so that it may leave | separate from the conveyance roller 12 (that is, gradually goes to the opposing position from the clamping position). Good.

  -In embodiment, the site | part which connects the extension part 41a and the slanting wall part 41c may be an orthogonal part which extends in a straight line toward the downward direction while being orthogonal to the extension direction of the extension part 41a. . In this case, when the rear end of the recording paper P is separated from between the transport driving roller 12a and the transport driven roller 12b, the rear end of the recording paper P that has jumped up is received by the inclined wall portion 41c.

In the embodiment, for example, a plurality of receiving members 41 may be provided intermittently at regular intervals along the width direction.
-In embodiment, the receiving member 41 may be formed from the conductive resin material, for example.

-In embodiment, the receiving member 41 may be formed from the nonelectroconductive resin material.
In the embodiment, the length L1 along the width direction of the receiving member 41 is the same as the length L2 along the width direction of the recording paper P or slightly smaller than the length L2 along the width direction of the recording paper P. It may be shorter.

  In the embodiment, a displacement mechanism for displacing the length along the width direction of the receiving member 41 may be further provided so that the width of the receiving member 41 corresponds to the width of the recording paper P.

  In the embodiment, the receiving member 41 has a holding position where the recording paper P is sandwiched between the paper discharge driving roller 13a and the paper discharge driven roller 13b, and the recording paper P on the support member 30 has the nozzle forming surface 22a. It may be further provided between the opposing positions and between the support member 30 and the nozzle forming surface 22a. At the time of duplex printing, when the recording paper P is transported from the paper discharge roller 13 side to the transport roller 12 side, the rear end of the recording paper P on the paper discharge roller 13 side is a paper discharge driving roller 13a and a paper discharge driven roller 13b. When the restraint state is released after passing through the nipping position, the rear end portion of the recording paper P that has jumped up is received by the receiving member 41.

In the embodiment, an endless rotating belt that circulates in opposite directions may be used as the pair of rotating bodies.
In the embodiment, the recording medium is not limited to paper, and may be a film or cloth, for example. Even at the rear end of the film or cloth, if the rear end jumps up vigorously, like the recording paper P, dust such as paper dust may be scattered. However, according to this invention, it is suppressed that such dust adheres to the nozzle formation surface 22a.

  The present invention is embodied as an ink jet printer used for printing. However, the present invention is not limited to this, and the present invention may be applied to a liquid ejecting apparatus that ejects liquid other than ink (however, excluding gas). A liquid droplet means a state of liquid ejected from the liquid ejecting apparatus, and includes liquid droplets that are granular, tear-like, or thread-like. The liquid here may be any material that can be ejected by the liquid ejecting apparatus. For example, it may be in a state in which the substance is in a liquid phase, such as a liquid with high or low viscosity, sol, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals (metal melts ) And a liquid as one state of the substance, as well as particles in which functional material particles made of solid materials such as pigments and metal particles are dissolved, dispersed or mixed in a solvent. Further, representative examples of the liquid include ink and liquid crystal as described in the above embodiment. Here, the ink includes general water-based inks and oil-based inks, and various liquid compositions such as gel inks and hot-melt inks. As a specific example of the liquid ejecting apparatus, for example, a liquid containing a material such as an electrode material or a coloring material used for manufacturing a liquid crystal display, an EL (electroluminescence) display, a surface light emitting display, a color filter or the like in a dispersed or dissolved form. It may be a liquid ejecting apparatus for ejecting, a liquid ejecting apparatus for ejecting a bio-organic material used for biochip manufacturing, a liquid ejecting apparatus for ejecting a liquid as a sample used as a precision pipette, a textile printing apparatus, a microdispenser, or the like. In addition, transparent resin liquids such as UV curable resin to form liquid injection devices that pinpoint lubricant oil onto precision machines such as watches and cameras, and micro hemispherical lenses (optical lenses) used in optical communication elements. A liquid ejecting apparatus that ejects a liquid onto the substrate or a liquid ejecting apparatus that ejects an etching solution such as an acid or an alkali to etch the substrate may be employed. The present invention can be applied to any one of these liquid ejecting apparatuses.

  P: a recording sheet as a recording medium, 12: a transport roller constituting a transport means, 12a: a transport driving roller as a rotating body, 12b: a transport driven roller as a rotating body, 13 ... a paper discharge roller constituting a transport means, Reference numeral 13a: a discharge driving roller as a rotating body, 13b: a discharge driven roller as a rotating body, 21: a recording head as a liquid ejecting head, 22a: a nozzle forming surface, 30: a support member, 41: a receiving member.

In order to achieve the above object, a liquid ejecting apparatus of the present invention includes a liquid ejecting head having a nozzle forming surface on which nozzles for ejecting liquid to a recording medium are formed, and the recording medium is opposed to the nozzle forming surface. In addition, the recording medium is sandwiched between a support portion that can be supported in a state spaced from the nozzle forming surface and a pair of rotating bodies that can sandwich the recording medium from both front and back sides. A transport unit that transports the rotating body toward the support side, which is downstream in the transport direction by rotating the rotating body, and a position that is between the sandwiching position of the recording medium by the rotating bodies and the nozzle in the transport direction. A wall portion provided so as to be able to come into contact with the surface of the recording medium, an extending portion that covers an upper portion of the pair of rotating bodies from the upstream side in the transport direction from the clamping position, the extending portion and the wall Connections connecting departments And the wall portion has an abutting portion extending toward the nozzle formation surface from the clamping position side in the transport direction on the support portion side of the wall portion. A receiving portion is provided on the wall portion side of the connecting portion so as to extend from a position on the downstream side in the transport direction from the clamping position so as to continue to the contact portion on the downstream side in the transport direction; The length from the upstream end of the receiving portion in the transport direction to the downstream end of the contact portion in the transport direction is from the clamping position in the transport direction to the upstream end of the receiving portion. Longer than

In the liquid ejecting apparatus according to the aspect of the invention, the receiving member may be movably supported so that a gap between the support portion and the contact portion changes .

In the liquid ejecting apparatus according to the aspect of the invention, the receiving member may be slidably supported on an axis center located on the upstream side in the transport direction from the clamping position .

In the liquid ejecting apparatus according to the aspect of the invention, a plurality of the receiving members are provided at intervals along a direction intersecting the transport direction, and among the plurality of receiving members, a direction intersecting the transport direction. The distance between the extreme ends of the receiving members at both ends of the recording medium may be longer than the length of the recording medium in the direction intersecting the transport direction .

In the liquid ejecting apparatus of the invention, the receiving member may be formed of a resin material .

In the liquid ejecting apparatus according to the aspect of the invention, the receiving member may be conductive and grounded .

In the liquid ejecting apparatus according to the aspect of the invention, the receiving member includes a receiving position where the wall portion can contact the surface of the recording medium, and an avoidance position where the wall portion can avoid contacting the surface of the recording medium. When the end on the downstream side in the conveyance direction of the recording medium passes through the clamping position and is conveyed onto the support unit, the recording medium moves from the avoidance position to the receiving position. May be.

Claims (6)

A liquid ejecting head having a nozzle forming surface on which nozzles for ejecting liquid to a recording medium are formed;
A support portion capable of supporting the recording medium in a state of being opposed to the nozzle forming surface and spaced apart from the nozzle forming surface;
The nozzle forming surface from the upstream side in the transport direction by rotating the rotating body in a state where the recording medium is sandwiched between rotating bodies that form a pair capable of sandwiching the recording medium from both the front and back sides. Transport means for transporting between the support part and
A downstream rotating body that is disposed downstream of the nozzle forming surface in the transport direction and forms a pair capable of sandwiching the recording medium from both front and back sides;
The nozzle forming surface is provided at a position between the nozzle and the holding position of the recording medium by the rotating bodies in the conveying direction so as to be in contact with the surface of the recording medium to be conveyed. A wall portion extending linearly toward the direction approaching the receiving member, and a plurality of receiving members provided at intervals along the direction intersecting the transport direction;
With
The receiving member has an extending part that covers the upper part of the pair of rotating bodies from the upstream side in the transport direction from the clamping position, and a curved part that connects the extending part and the wall part, Supported upstream from the clamping position in the transport direction,
The curved portion is provided so as to be continuous with the surface of the wall portion on the support portion side, and a receiving portion for receiving the recording medium before the surface of the recording medium contacts the surface of the wall portion. A liquid ejecting apparatus comprising:   The liquid ejecting apparatus according to claim 1, wherein the receiving member is made of a resin material.   The liquid ejecting apparatus according to claim 1, wherein the receiving member has conductivity and is grounded.   4. The liquid ejecting apparatus according to claim 1, wherein the receiving member swings so that a gap between the support portion and the wall portion changes. 5.   Among the plurality of receiving members provided, the distance between the outermost ends of the receiving members which are both ends in the direction intersecting the transport direction is longer than the length of the recording medium in the direction intersecting the transport direction. The liquid ejecting apparatus according to any one of claims 1 to 4.   The said wall part is arrange | positioned so that a clearance gap may be formed in the position where the said nozzle formation surface and the said support part oppose in the position near the said support part rather than the surface containing the said nozzle formation surface. The liquid ejecting apparatus according to any one of claims 1 to 5.

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