JP2007260981A - Recording apparatus and liquid jetting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording apparatus capable of precisely conveying a medium while deflection of a rotating shaft of a conveying driving roller is corrected. <P>SOLUTION: The recording apparatus is equipped with a recording head 24 for delivering ink to the medium 19 while it moves back and forth to the medium 19, and a conveying part 40 for conveying the medium 19 to a position opposing the recording head 24, are equipped. The conveying part 40 has a conveying driving roller 41 whose both ends are supported and which is rotated by providing a driving force, and a conveying following roller 43 which pinches the medium 19 between it and the conveying driving roller 41, and follows the conveying driving roller 41 to rotate. The recording apparatus is also equipped with a piezoelectric element 220 performing a stretching and contracting movement by loading an electric voltage, and furthermore, an actuator 100 coming into contact with the conveying driving roller 41 at least at a part of the stretching and contracting movement between both ends of the conveying driving roller 41 from the direction solving the deflection of the conveying driving roller 41 to give a driving force to the conveying driving roller 41. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a recording apparatus and a liquid ejecting apparatus. In particular, the present invention relates to a recording apparatus and a liquid ejecting apparatus for recording a medium that is a recording object by conveying the medium with a conveyance driving roller.

An ink jet recording apparatus or the like includes a medium transport unit having a driving roller and a driven roller that rotate while abutting each other on outer peripheral surfaces. The medium conveying unit conveys the medium by rotating the driving roller with the medium sandwiched between the driving roller and the driven roller (see, for example, Patent Document 1).
JP-A-6-70111

  By the way, the drive roller is relatively long in the direction of the rotation axis, and is held at both ends in the longitudinal direction. Therefore, the rotation axis of the driving roller may be bent due to its own weight and a load from other members such as a conveyance driven roller that is pressed and driven by the driving roller. When the rotation shaft of the driving roller is bent, the medium is not accurately conveyed, and the ink jet recording apparatus cannot print clearly on the medium.

  In order to solve the above problems, in the first embodiment of the present invention, a recording head that discharges ink to a medium while reciprocating with respect to the medium, and a transport unit that transports the medium to a position facing the recording head, The conveyance unit includes a conveyance drive roller that is pivotally supported at both ends and rotates when a driving force is applied, and a conveyance driven roller that rotates around the conveyance drive roller with a medium sandwiched between the conveyance drive roller and the conveyance drive roller. And having a piezoelectric element that expands and contracts when a voltage is applied, and conveys at least part of the expansion and contraction movement between both ends of the transport driving roller in a direction that eliminates the bending of the transport driving roller. Provided is a recording apparatus further comprising an actuator that applies a driving force to a driving roller. The recording apparatus according to the first aspect of the present invention rotationally drives the conveyance drive roller while supporting the conveyance drive roller from the direction in which the deflection of the conveyance drive roller is eliminated by an actuator. Thereby, according to the recording apparatus of the 1st form of this invention, a medium can be conveyed accurately, correct | amending the deflection | deviation of the rotating shaft of a conveyance drive roller.

  In the recording apparatus, the conveyance drive roller has a high friction region provided on the outer peripheral surface, and a low friction region provided in a portion in contact with the actuator on the outer peripheral surface and having a smaller friction coefficient than the high friction region. Good. According to such a recording apparatus, since the frictional force between the conveyance driving roller and the medium is large, the medium can be reliably conveyed.

  In the recording apparatus, the actuator may contact the center of both ends in the axial direction of the transport driving roller. As a result, the deflection of the rotation shaft of the transport driving roller can be corrected more reliably.

  In order to solve the above-described problem, in the second embodiment of the present invention, a liquid ejecting head that ejects liquid onto the medium while reciprocating with respect to the medium, and a transport that transports the medium to a position facing the liquid ejecting head. The conveyance unit is supported at both ends and supported by a conveyance drive roller that rotates when a driving force is applied, and a conveyance driven roller that rotates around the conveyance drive roller with a medium sandwiched between the conveyance drive roller and the conveyance drive roller. It has a roller and has a piezoelectric element that expands and contracts when a voltage is applied, and abuts at least part of the expansion and contraction movement between both ends of the transport drive roller from the direction of eliminating the deflection of the transport drive roller. The liquid ejecting apparatus further includes an actuator that applies a driving force to the transport driving roller. Thereby, according to the liquid ejecting apparatus of the second aspect of the present invention, the same effect as that of the first aspect can be obtained.

  The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the scope of claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

  FIG. 1 is a schematic perspective view of an ink jet recording apparatus 10 that is an embodiment of a liquid ejecting apparatus. FIG. 2 is a schematic side view of the ink jet recording apparatus 10 of FIG. 1 as viewed from the conveyance unit drive gear 49 side. The ink jet recording apparatus 10 includes an apparatus main body 11, a paper feed unit 13 on which a medium 19 is placed, a transport unit 40 that transports the medium 19 of the paper feed unit 13, and a medium 19 transported by the transport unit 40 below. A platen 15 that is supported from above, a recording unit 20 that is arranged above the platen 15 and records on the medium 19, a discharge unit 60 that discharges the medium 19 to the discharge port 17, a transport unit 40, and a discharge unit 60. And an actuator 100 to be driven.

  The recording unit 20 includes a carriage motor 32, a timing belt 30, a carriage 22, a recording head 24, and an ink cartridge 26. The timing belt 30 is stretched across the width direction of the apparatus main body 11, and rotates upon receiving a rotational driving force from the carriage motor 32. The carriage 22 holds the timing belt 30, and reciprocates on the medium 19 when the carriage motor 32 rotationally drives the timing belt 30. The recording head 24 is held below the carriage 22 and discharges ink to the medium 19. The ink cartridge 26 contains ink therein and is detachably held on the carriage 22.

  The transport unit 40 includes a transport drive roller 41, a transport driven roller 43, and a transport unit drive gear 49, and is disposed between the paper feed unit 13 and the recording unit 20. The transport driving roller 41 includes a cylindrical roller body 42 that contacts the medium 19, and shafts 45 disposed at both ends of the roller body 42 in the axial direction. The transport unit drive gear 49 is fixed to the shaft 45 and rotates integrally with the shaft 45 as a rotation axis. The shaft 45 is rotatably supported by the frame 80 of the apparatus main body 11.

  The actuator 100 abuts from the direction in which the bending of the transport driving roller 41 is eliminated, and applies a driving force to the transport driving roller 41. The direction in which the deflection of the transport drive roller 41 is eliminated is a direction opposite to the resultant force of the force due to the weight of the transport drive roller 41 and the pressing force received by the member that presses the transport drive roller 41 such as the transport driven roller 43. . As a result, the actuator 100 rotationally drives the transport driving roller 41 and supports the transport driving roller 41 from the direction in which the deflection of the transport driving roller 41 is eliminated. Details of the actuator 100 will be separately illustrated and described below.

  The discharge unit 60 includes a discharge drive roller 61, a discharge driven roller 63, and a discharge unit drive gear 69, and is disposed between the recording unit 20 and the discharge port 17. The discharge drive roller 61 has a shaft 65. The discharge part drive gear 69 is fixed to the shaft 65 and rotates integrally with the shaft 65 as a rotation axis. The shaft 65 is rotatably supported by the frame 80 of the apparatus main body 11. As a result, the discharge driven roller 63 is rotatably supported with respect to the apparatus main body 11, and rotates with the discharge drive roller 61.

  The transmission unit 50 transmits the rotational driving force of the transport unit 40 to the discharge unit 60. The transmission unit 50 includes a shaft 55, a first transmission gear 57, and a second transmission gear 59. The first transmission gear 57 and the second transmission gear 59 are arranged in this order from the front side in FIG. 2, and are fixedly connected to the shaft 55 with the shaft 65 as a rotation axis. The shaft 55 is rotatably supported by the frame 80 of the apparatus main body 11.

  The conveyance unit drive gear 49, the first transmission gear 57, the second transmission gear 59, and the discharge unit drive gear 69 of the ink jet recording apparatus 10 each have a gear shape in which a plurality of teeth are formed on the outer peripheral portion. The conveying portion drive gear 49 and the first transmission gear 57, and the second transmission gear 59 and the discharge portion drive gear 69 are engaged with each other. Therefore, for example, when the transport unit drive gear 49 rotates clockwise in FIG. 2, the first transmission gear 57 and the second transmission gear 59 rotate counterclockwise in FIG. 69 rotates clockwise in FIG. As described above, when the transport driving roller 41 rotates in the clockwise direction in FIG. 2, the discharge driving roller 61 also rotates clockwise in conjunction with the transport driving roller 41 and the transport driven roller 43 that rotates with the transport driving roller 41 and the discharge driving roller 61, respectively. Both the discharge driven roller 63 and the discharge driven roller 63 rotate counterclockwise. In FIG. 2, the tooth formed on the outer peripheral portion of each gear is omitted, and the tip circle and the root circle are shown.

  Next, a recording operation in the ink jet recording apparatus 10 will be described. First, the actuator 100 directly applies a rotational driving force to the transport driving roller 41. As a result, the transport driving roller 41 rotates and transports the medium 19 onto the platen 15 with the medium 19 sandwiched between the transport driving roller 41 and the transport driven roller 43. In this state, the carriage motor 32 rotationally drives the timing belt 30, whereby the carriage 22 that holds the timing belt 30 reciprocates in the width direction of the apparatus main body 11. As the carriage 22 reciprocates, the recording head 24 held by the carriage 22 ejects ink supplied from the ink cartridge 26 to the medium 19 while reciprocating on the medium 19. To record. The recording head 24 may eject ink while moving in both directions of reciprocating movement, or may eject ink when moving in any one direction. Thereafter, the transport driving roller 41 and the transport driven roller 43 transport the medium 19 by a minute amount, and the recording head 24 ejects ink while reciprocating on the medium 19. By repeating this operation, recording is performed on the entire upper surface of the medium 19. The discharge driving roller 61 and the discharge driven roller 63 discharge the medium 19 on which recording has been performed from the platen 15 to the paper discharge port 17 in conjunction with the conveyance drive roller 41 and the conveyance driven roller 43.

  FIG. 3 shows an example of the arrangement of the transport unit 40. FIG. 4 is a schematic side view of the transport unit 40 as viewed from a direction parallel to the axis of the transport drive roller 41. The shafts 45 at both ends of the transport driving roller 41 are pivotally supported by the frame 80.

  As shown in FIGS. 3 and 4, the transport drive roller 41 has the roller body 42 and the shaft 45. The roller main body 42 and the shaft 45 may be integrally formed, and the diameter of the roller main body 42 and the diameter of the shaft 45 may be the same or different.

  The roller body 42 has a high friction region 521 provided on the outer peripheral surface, and a low friction region 522 provided in a portion in contact with the actuator 100 on the outer peripheral surface. In the form shown in FIG. 3, the low friction region 522 is the outer peripheral surface of the cylindrical roller body 42 and is arranged in the center in the axial direction, and the high friction region 521 is the outer periphery of the cylindrical roller body 42. It is a surface and is arranged on both sides of the low friction region 522 in the axial direction. The roller body 42 is made of metal such as SUS, and the frictional force is increased by applying alumina or the like to the high friction region 521, while the alumina or the like is applied to the low friction region 522. The frictional force is low without any failure.

  The transport driven roller 43 presses the transport drive roller 41 by being biased in the direction of the transport drive roller 41 by, for example, a coil spring. As a result, the transport driven roller 43 can be rotated around the medium 19 with the transport drive roller 41.

  In the form shown in FIG. 3, the contact portion 230 of the actuator 100 comes into contact with the center of the transport drive roller 41 in the axial direction of the roller body 42 from the direction in which the deflection of the transport drive roller 41 is eliminated. In this case, the abutting portion 230 abuts on the low friction region 522 of the roller body 42 from the direction in which the deflection of the transport driving roller 41 is eliminated. For example, the actuator 100 is disposed on a horizontal plate 515 of a pedestal frame 514 provided on a lower frame 513 as a casing of the ink jet recording apparatus 10, and is further provided perpendicular to the horizontal plate 515. The fixing frame 516 may be fixed.

  FIG. 5 shows a plan view of the actuator 100. As shown in FIG. 5, the actuator 100 includes a vibrating body 200, a support body 300, and a vibrating body holding unit 400. The vibrating body 200 is attached to the vibrating body holding part 400 via a support body 300 that fixes the vibrating body 200 so as to vibrate. A plurality of mounting holes 451 (four in the present embodiment) are provided in the vibrating body holding unit 400. For example, at the position where the actuator 100 of the fixing frame 516 is mounted, the mounting body 451 is formed at a position corresponding to the mounting hole 451. It is fixed to the hole with screws 450 and attached.

  FIG. 6 is an exploded perspective view of the vibrating body 200 and the support body 300. The vibrating body 200 includes a flat plate-like reinforcing plate 210 and flat plate-like piezoelectric elements 220 provided on both the front and back surfaces of the reinforcing plate 210. The reinforcing plate 210 is made of a material such as stainless steel, for example, and is integrally formed at one end of the short side so that a contact portion 230 having a substantially arc-shaped cross section protrudes in the longitudinal direction at the substantially center in the width direction. ing. Arm portions 240 are integrally formed on both sides in the width direction at substantially the center in the longitudinal direction of the reinforcing plate 210. The arm portion 240 protrudes from the reinforcing plate 210 at a substantially right angle, and a hole 241 is formed in each of these end portions. The piezoelectric elements 220 are bonded to the substantially rectangular portions on both sides of the reinforcing plate 210, respectively.

  The material of the piezoelectric element 220 is not particularly limited, and lead zirconate titanate (PZT (registered trademark)), crystal, lithium niobate, barium titanate, lead titanate, lead metaniobate, polyvinylidene fluoride, zinc niobate Various materials such as lead and lead scandium niobate can be used. Electrodes 221, 222, 223, and 224 made of nickel or gold are formed on both surfaces of the piezoelectric element 220 by a method such as plating, sputtering, or vapor deposition. Of these electrodes 221, 222, 223, and 224, an electrode 224 is formed over the entire surface of the piezoelectric element 220 on the surface of the piezoelectric element 220 that faces the reinforcing plate 210. In addition, a plurality of electrodes 221, 222, and 223 are formed on the surface of the piezoelectric element 220 that is not opposed to the reinforcing plate 210 in line symmetry with the center line along the longitudinal direction of the piezoelectric element 220 as an axis. These electrodes 221, 222, and 223 are electrically insulated from each other by grooves 251 and 252.

  That is, two grooves 251 are formed so that the piezoelectric element 220 is substantially divided into three in the width direction, and among the electrodes divided into three by these grooves 251, the electrodes on both sides are further in the longitudinal direction of the piezoelectric element 220. A groove 252 is formed so as to bisect. Due to these grooves 251 and 252, the surface of the piezoelectric element 220 is provided with an electrode 221 at the center in the width direction of the piezoelectric element 220, and electrodes 222 and 223 each having a pair of electrodes at opposite ends on both sides of the electrode 221. It is formed. These electrodes 221, 222, and 223 are similarly formed on the surfaces of the front and back piezoelectric elements 220 provided on both sides of the reinforcing plate 210 so as not to face the reinforcing plate 210. An electrode 221 is formed on the back side of the electrode 221.

  As shown in FIG. 5, the vibration body holding portion 400 of the actuator 100 is provided with a total of four conduction pins 350, two on each side of the vibration body 200. These four conducting pins 350 are insulated from each other by an insulating member 360 interposed therebetween, and are also insulated from the vibrating body holding unit 400. The electrodes 221, 222, 223, and 224 are electrically connected to different conduction pins 350 by lead wires (not shown). These four conduction pins 350 are also electrically connected to a control circuit 502 that applies an AC voltage to the piezoelectric element 220. The conductive pin 350 is preferably made of a conductive material such as metal, and the surface is preferably plated with gold in order to reduce the conductive resistance.

  The piezoelectric element 220 has dimensions, thicknesses, electrode divisions, and the like, such as so-called longitudinal vibration in which the piezoelectric element 220 expands and contracts in the longitudinal direction when a voltage is repeatedly applied to the piezoelectric element 220 from the control circuit 502, and the piezoelectric element. It is set as appropriate so that so-called bending vibration that bends in a direction orthogonal to the longitudinal vibration appears symmetrically with respect to the plane center of 220 at the same time.

  The frequency of the voltage applied to the piezoelectric element 220 is such that both vibrations appear favorably between the resonance frequency of the longitudinal vibration and the resonance frequency of the bending vibration, more preferably between the anti-resonance frequency and the resonance frequency of the bending vibration. Select the frequency as appropriate. The waveform of the voltage applied to the piezoelectric element 220 is not particularly limited, and for example, a sine wave, a rectangular wave, a trapezoidal wave, or the like can be adopted.

  As shown in FIG. 6, the support 300 is integrally formed between a pair of fixing portions 310 to which the vibrating body 200 is fixed, and the fixing portions 310, and is slidable on the vibrating body holding portion 400. The slide part 320 is supported. For the support body 300, a desired material may be used as long as it is a material having durability required for vibration by the vibration body 200, such as hard plastic. A screw hole 311 is formed in the fixing portion 310 at a position corresponding to the hole 241 of the arm portion 240. The vibrating body 200 is fixed to the fixing portion 310 by screwing the screw 260 through the hole 241 into the screw hole 311. Therefore, if the screw 260 is unscrewed, the vibrating body 200 can be detached from the support body 300 (vibrating body holding part 400). The slide part 320 is arranged in a slide groove 420 (FIG. 5) formed in a concave shape in the vibration body holding part 400, and in the direction in which the support body 300 approaches and separates from the transport drive roller 41 at the center in the width direction. A plurality of long holes 321 (two in this embodiment) are formed so as to be parallel. A screw 421 (FIG. 5) passes through the elongated hole 321, and the screw 421 is screwed into a screw hole 422 formed in the vibrating body holding unit 400. Thus, the support 300 can slide only in the longitudinal direction of the long hole 321, that is, in the direction along the radial direction of the transport driving roller 41 from the position where the contact portion 230 contacts the transport driving roller 41. .

  Further, as shown in FIG. 6, in the support body 300, the fixed portion 310 and the slide portion 320 are formed with a step. Accordingly, a concave portion is formed at the center by the fixing portion 310 and the slide portion 320. Thereby, when the vibrating body 200 is attached to the fixed portion 310, a gap is formed between the vibrating body 200 and the slide portion 320. Therefore, even if the vibrating body 200 vibrates, it interferes with the slide portion 320 and the screw 421. There is nothing to do.

  As shown in FIG. 6, in the fixing portions 310 on both sides of the support body 300, spring mounting portions 331 projecting in a columnar shape are formed on the side surfaces of the end portions far from the contact portions 230 of the vibrating body 200. . As shown in FIG. 5, the spring mounting portion 331 is inserted into one end of the spring 340. A cylindrical contact pin 431 is inserted into the other end of the spring 340. The contact pin 431 is fixed to a locking piece 430 provided in the vibrating body holding unit 400. The spring 340 arranged in this manner gives an elastic force to the support body 300 and the vibration body holding part 400 to which the vibration body 200 is fixed so as to be separated in the longitudinal direction of the vibration body 200.

  Hereinafter, the operation of the vibrating body 200 in the actuator 100 will be described. FIG. 7 shows a schematic diagram of the operation of the vibrating body 200. 7A shows the longitudinal vibration of the vibrating body 200, FIG. 7B shows the bending vibration of the vibrating body 200, and FIG. 7C shows the vibration locus of the contact portion 230. The vibrating body 200 vibrates by applying an AC voltage between the electrodes 221, 222, 223 and the electrode 224. When an AC voltage is applied between the electrode 221 and the electrode 224 and between the electrode 222 and the electrode 224, the piezoelectric element 220 mainly between the electrode 221 and the electrode 224 as shown in FIG. The piezoelectric element 220 excites longitudinal vibration by expanding and contracting in the longitudinal direction. Further, as shown in FIG. 7B, the piezoelectric element 220 between the electrode 222 and the electrode 224 on both sides of the electrode 221 expands and contracts, so that the piezoelectric element 220 is in a direction orthogonal to the longitudinal vibration. A bending vibration that is bent point-symmetrically with respect to the plane center of the piezoelectric element 220 is excited.

  When these longitudinal vibrations and bending vibrations appear simultaneously, the contact portion 230 of the vibrating body 200 vibrates in a substantially elliptical orbit as shown in FIG. The contact portion 230 rotates the transport driving roller 41 by pressing the transport driving roller 41 in a part of the elliptical orbit. By repeating this at a predetermined frequency, the transport driving roller 41 rotates in one direction at a predetermined rotation speed. Further, when the transport driving roller 41 is rotated in the opposite direction, the electrodes 221, 222, and 224 to which the voltage is applied are switched symmetrically about the center line along the longitudinal direction of the vibrating body 200. That is, when a voltage having a predetermined frequency is applied between the electrodes 221 and 224 of the piezoelectric element 220 and between the electrodes 223 and 224, the contact portion 230 vibrates while drawing an elliptical orbit in the opposite direction. Thereby, the conveyance driving roller 41 rotates in the opposite direction.

  3 and 4, the piezoelectric element 220 of the actuator 100 expands and contracts when a voltage is applied from a control circuit 502 provided in the ink jet recording apparatus 10. In this case, the actuator 100 is driven and transported by the contact portion 230 in at least a part of the expansion / contraction movement of the piezoelectric element 220, that is, in at least a portion of the elliptical orbit formed by the vibration of the contact portion 230. It arrange | positions so that the low friction area | region 522 of the roller 41 may be pressed. More specifically, in the actuator 100, the surface formed by the elliptical orbit of the contact portion 230 is perpendicular to the rotation axis of the transport driving roller 41, and the tip of the contact portion 230 is partly in the elliptical orbit. Is arranged so as to contact the low friction region 522. As a result, the actuator 100 can rotationally drive the transport driving roller 41 in accordance with the vibration of the contact portion 230 in an elliptical orbit.

  In this case, the actuator 100 applies a rotational driving force to the transport driving roller 41 and applies a force that pushes up from below the rotation shaft to the transport driving roller 41. As a result, the deflection caused by gravity in the axial direction of the transport drive roller 41 can be corrected. Therefore, the rotation shaft of the transport driving roller 41 is kept horizontal, and the medium 19 can be transported with high accuracy. In order to keep the rotation axis of the transport driving roller 41 more horizontal, the contact portion 230 does not leave the low friction region 522 and does not leave the low friction region 522 in the expansion and contraction movement of the piezoelectric element 220. It is preferable to drive the conveyance drive roller 41 by periodically repeating the magnitude of the urging force while keeping it.

  Further, the actuator 100 vibrates longitudinally with respect to the transport driving roller 41 in a paper jam or the like. That is, the piezoelectric element 220 of the actuator 100 is linearly expanded and contracted, and the contact portion 230 reciprocates on a straight line toward the center of the low friction region 522 of the transport driving roller 41. Thereby, when the medium 19 is manually pulled out by paper, for example, the actuator 100 can freely rotate the transport driving roller 41.

  Further, the contact portion 230 of the actuator 100 contacts the lower portion different from the upper portion with which the medium 19 contacts on the outer periphery of the transport driving roller 41 when viewed from a direction parallel to the rotation axis. The conveyance drive roller 41 can be driven without contacting the medium 19.

  The transport unit 40 may be supported by a plurality of actuators 100 in the axial direction of the transport drive roller 41. By supporting the transport drive roller 41 in the axial direction with a plurality of actuators 100, the rotation shaft of the transport drive roller 41 can be kept more horizontal.

  Further, the control circuit 502 may supply the piezoelectric element 220 with a voltage having a value set in advance so as to move the rotation shaft of the transport driving roller 41 to a position without deflection. Further, the control circuit 502 may detect the amount of deflection of the transport driving roller 41 in the direction of gravity and generate a voltage corresponding to the detected amount of deflection. As an example of this, the control circuit 502 detects the electromotive force of the piezoelectric element 220 that is generated when the transport driving roller 41 pushes the contact portion 230 in the direction of gravity, and based on the detected electromotive force, the control circuit 502 A voltage value is calculated so that the position of the rotation axis is not deflected, and the piezoelectric element 220 is driven according to the calculated voltage value. Thereby, according to the actuator 100, even if it is a case where the deflection amount changes according to an environment, the correction | amendment corresponding to the deflection amount can be performed.

1 is a schematic perspective view of an ink jet recording apparatus 10 that is an embodiment of a liquid ejecting apparatus. FIG. 2 is a schematic side view of the ink jet recording apparatus 10 of FIG. 1 viewed from the conveyance unit drive gear 49 side. A schematic side view of the transport unit 40 is shown together with a control circuit 502. The schematic side view of the conveyance part 40 seen from the direction parallel to the rotating shaft of the conveyance drive roller 41 is shown. A plan view of the actuator 100 is shown. The exploded perspective view of the vibrating body 200 and the support body 300 is shown. The schematic diagram which shows operation | movement of the vibrating body 200 is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Inkjet recording apparatus, 11 Apparatus main body, 13 Paper feed part, 15 Platen, 17 Paper discharge port, 19 Medium, 20 Recording part, 22 Carriage, 24 Recording head, 26 Ink cartridge, 30 Timing belt, 32 Carriage motor, 40 Conveying section, 41 Conveying drive roller, 42 Roller body, 43 Conveying driven roller, 45 shaft, 49 Conveying section driving gear, 50 Transmission section, 55 Shaft, 57 First transmission gear, 59 Second transmission gear, 60 Discharge section, 61 Ejection drive roller, 63 Ejection driven roller, 65 shaft, 69 Ejection drive gear, 80 frame, 100 actuator, 200 vibrator, 210 reinforcing plate, 220 piezoelectric element, 221 electrode, 222 electrode, 223 electrode, 224 electrode, 230 Contact, 240 Arm, 241 , 251 groove, 252 groove, 260 screw, 300 support, 310 fixing part, 311 screw hole, 320 slide part, 321 long hole, 331 spring mounting part, 340 spring, 350 conducting pin, 360 insulating member, 400 vibrating body holding , 420 slide groove, 421 screw, 422 screw hole, 430 locking piece, 431 contact pin, 450 screw, 451 mounting hole, 502 control circuit, 513 lower frame, 514 base frame, 515 horizontal plate, 516 fixing Frame, 521 High friction area, 522 Low friction area

Claims (4)

A recording head that ejects ink onto the medium while reciprocating with respect to the medium;
A transport unit that transports the medium to a position facing the recording head;
The transport unit includes a transport drive roller that is pivotally supported at both ends and rotates when a driving force is applied thereto, and a transport driven roller that rotates around the transport drive roller with a medium interposed between the transport drive roller and the transport drive roller. Have
A piezoelectric element that expands and contracts when a voltage is applied thereto, and contacts at least a part of the expansion and contraction movement between the both ends of the transport driving roller from a direction of canceling the deflection of the transport driving roller. A recording apparatus further comprising an actuator for applying a driving force to the conveyance driving roller.   The recording apparatus according to claim 1, wherein the actuator is in contact with a center of the both ends in the axial direction of the transport driving roller.   The conveyance driving roller has a high friction region provided on an outer peripheral surface, and a low friction region provided in a portion of the outer peripheral surface in contact with the actuator and having a friction coefficient smaller than that of the high friction region. The recording device described in 1. A liquid ejecting head that ejects liquid onto the medium while reciprocating with respect to the medium;
A transport unit that transports the medium to a position facing the liquid ejecting head;
The transport unit includes a transport drive roller that is pivotally supported at both ends and rotates when a driving force is applied thereto, and a transport driven roller that rotates around the transport drive roller with a medium interposed between the transport drive roller and the transport drive roller. Have
A piezoelectric element that expands and contracts when a voltage is applied thereto, and contacts at least a part of the expansion and contraction movement between the both ends of the transport driving roller from a direction of canceling the deflection of the transport driving roller. A liquid ejecting apparatus further comprising an actuator that applies a driving force to the transport driving roller.

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