JP2007204168A - Liquid jetting device, recording device and drive mechanism used for these - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To drive a conveying drive roller at a stable vibration mode. <P>SOLUTION: The liquid jet device for jetting a liquid to a recording object 19 while conveying the object 19 is provided with the conveying drive roller 41 rotated by giving rotation drive force; a conveying driven roller 43 rotated together while clamping the object 19 between the conveying drive roller 41 and the driven roller; and a drive part 100 for giving rotation drive force to the conveying drive roller 41. The drive part 100 includes at least either of a plate-like piezoelectric element 220 and a pair of electrodes for clamping the piezoelectric element 220 in a surface direction. A recording device is provided, which has a vibration body 200 abutted and separated relative to an outer peripheral surface of the conveying drive roller 41 in a surface direction of the piezoelectric element 220 by giving a periodical voltage between the pair of electrodes; and a vibration body retaining part 400 for supporting the vibration body 200 while maintaining the surface direction of the piezoelectric element 220 parallel to a plane perpendicular to a rotation shaft of the conveying drive roller 41. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid ejecting apparatus, a recording apparatus, and a driving mechanism used for these. In particular, the present invention relates to a driving mechanism that applies a rotational driving force to a conveyance driving roller that conveys a recording material in a liquid ejecting apparatus or a recording apparatus by vibration of a piezoelectric element.

As a transport unit that transports a recording object of a recording apparatus such as an ink jet recording apparatus and a drive mechanism that applies a driving force to the transport unit, for example, a plurality of gears for a transport roller that transports the recording object There is known a mode in which the driving force of a motor is transmitted via the motor. Also, a paper feeding device that drives a roller by bending vibration of a paper feeding actuator using a piezoelectric element instead of a motor has been proposed (see, for example, Patent Document 1).
JP-A-6-70111

  However, in Patent Document 1, since the plate-like piezoelectric element drives the roller shaft of the transport roller by bending and vibrating in the thickness direction, for example, when the paper feed actuator presses the roller shaft with high pressure, There is a problem in that the boundary condition changes, resulting in a vibration mode different from the intended vibration mode. Furthermore, there is a problem that abnormal vibration occurs in the conveyance roller due to this unintended vibration mode change, or the transmission efficiency from the paper feed actuator to the conveyance roller decreases.

  In order to solve the above-mentioned problems, in the first embodiment of the present invention, a recording apparatus that records on a recording material while conveying the recording material, and is a conveyance driving roller that rotates when a rotational driving force is applied. A conveyance driven roller that rotates with the recording medium sandwiched between the conveyance drive roller and a drive unit that applies a rotational driving force to the conveyance drive roller. The drive unit includes a plate-like piezoelectric element and a piezoelectric element. It includes at least one pair of electrodes sandwiched in the surface direction, and applies a periodic voltage between each pair of electrodes, thereby abutting and separating in the surface direction of the piezoelectric element with respect to the outer peripheral surface of the transport driving roller. There is provided a recording apparatus including a vibrating body that vibrates, and a vibrating body holding portion that supports the vibrating body in such a manner that the surface direction of the piezoelectric element is parallel to a plane perpendicular to the rotation axis of the transport driving roller. Since the plate-like piezoelectric element disposed in the driving unit of the liquid ejecting apparatus bends and vibrates in the surface direction, the vibrating body has a conveyance driving roller as compared with the case where the piezoelectric element bends and vibrates in the thickness direction. The vibration mode can be stabilized even when pressed between the two. In addition, since the drive unit is smaller than an electric motor or the like, the space in the portion where the drive unit is arranged in the liquid ejecting apparatus can be reduced.

  In the recording apparatus, the conveyance driving roller has a shaft and a rotor that rotates integrally with the shaft and has a diameter larger than the diameter of the shaft, and the vibrating body is in contact with and separated from the outer periphery of the rotor. May be. As a result, compared to the case where the vibrating body abuts and separates from the outer periphery of the shaft to give a rotational driving force, the rotational driving force is abutted and separated from the outer periphery of the rotor having a diameter larger than the shaft. Therefore, a larger torque can be obtained.

  In the recording apparatus, the shaft may be pivotally supported by a plate-shaped frame, and the vibrating body holding unit may support the vibrating body with the surface direction of the piezoelectric element parallel to the surface direction of the frame. Thereby, the space of the part which arrange | positions a drive part can be made small with respect to the direction perpendicular | vertical to the surface direction of a flame | frame.

  In the recording apparatus, the vibrating body may be disposed inside the frame. Thereby, compared with the case where a vibrating body is distribute | arranged to the outer side of a flame | frame, a liquid ejecting apparatus can be reduced more in size.

  According to a second aspect of the present invention, there is provided a liquid ejecting apparatus that ejects liquid onto a recording material while conveying the recording material, and includes a conveyance driving roller that rotates when a rotational driving force is applied, and a conveyance driving roller A driven roller for rotating the recording medium between and a driving unit for applying a rotational driving force to the conveying driving roller. The driving unit sandwiches the plate-like piezoelectric element and the piezoelectric element in the surface direction. A vibrating body that includes at least one pair of electrodes and abuts and separates in the surface direction of the piezoelectric element with respect to the outer peripheral surface of the transport driving roller by applying a periodic voltage between each pair of electrodes; There is provided a liquid ejecting apparatus having a vibrating body holding portion that supports a vibrating body in such a manner that the surface direction of the piezoelectric element is parallel to a plane perpendicular to the rotation axis of the transport driving roller. Thereby, the effect similar to the 1st form can be acquired.

  According to a third aspect of the present invention, there is provided a drive mechanism for rotationally driving a rotating body, including at least one plate-like piezoelectric element and a pair of electrodes sandwiching the piezoelectric element in the surface direction, and each pair of electrodes. Between the vibrating body abutting and separating in the surface direction of the piezoelectric element with respect to the outer peripheral surface of the rotating body, and a surface perpendicular to the rotation axis of the rotating body. A driving mechanism including a vibrating body holding portion that supports the vibrating body is provided in parallel with the driving mechanism. Thereby, the effect similar to the 1st form can be acquired.

  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 which is an embodiment of a liquid ejecting apparatus according to the invention. 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 is conveyed by the apparatus main body 11, a paper feeding unit 13 for placing the recording material 19, a conveying unit 40 for conveying the recording material 19 of the paper feeding unit 13, and the conveying unit 40. A platen 15 that supports the recording material 19 from below, a recording unit 20 that is disposed above the platen 15 and records on the recording material 19, and a discharge unit 60 that discharges the recording material 19 to the paper discharge port 17. And a drive unit 100 that drives the transport unit 40 and the discharge unit 60.

  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 recording material 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 recording material 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, a shaft 45, a rotor 47, and a transport unit drive gear 49, and is disposed between the paper feed unit 13 and the recording unit 20. The transport drive roller 41, the rotor 47, and the transport unit drive gear 49 are fixedly connected to the shaft 45 with the shaft 45 serving as a rotation axis. The shaft 45 is rotatably supported by the frame 80 of the apparatus main body 11. The transport driven roller 43 is rotatably supported with respect to the apparatus main body 11 and rotates with the transport driving roller 41.

  The drive unit 100 is fixed to the frame 80 outside the outer peripheral surface of the rotor 47. A contact portion 230 that is one end of the drive unit 100 is in contact with the outer peripheral surface of the disc-shaped rotor 47. Details of the driving unit 100 will be described separately below.

  The discharge unit 60 includes a discharge drive roller 61, a discharge driven roller 63, a shaft 65, 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 and the discharge unit drive gear 69 are fixedly connected to the shaft 65 with the shaft 65 as a rotation axis. The shaft 65 is rotatably supported by the frame 80 of the apparatus main body 11. 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 drive unit 100 applies a rotational driving force to the rotor 47 to rotationally drive the rotor 47. Accordingly, the conveyance driving roller 41 connected by the rotor 47 and the shaft 45 is rotationally driven, and the recording medium 19 is conveyed on the platen 15 with the recording medium 19 being sandwiched between the conveyance driving roller 41 and the conveyance driven roller 43. To do. 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 reciprocates on the recording material 19 and discharges ink supplied from the ink cartridge 26 to the recording material 19. Then, recording is performed on the recording material 19. 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 recording material 19 by a minute amount, and the recording head 24 ejects ink while reciprocating on the recording material 19. By repeating this operation, recording is performed on the entire top surface of the recording material 19. The discharge driving roller 61 and the discharge driven roller 63 discharge the recorded object 19 on the platen 15 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 is a plan view of the drive unit 100. As shown in FIG. 3, the drive unit 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 this embodiment) are provided in the vibrating body holding unit 400, and correspond to the mounting holes 451 at positions where the driving unit 100 of the frame 80 is mounted, as shown in FIG. It is fixed and attached with a screw 450 to the hole formed in the position.

  FIG. 4 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. 3, the vibration body holding portion 400 of the drive unit 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). Further, these four conduction pins 350 are also electrically connected to an application device (not shown) for applying 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 dimensions, thickness, and electrode division form of the piezoelectric element 220 include 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 an applying device, and the piezoelectric element 220. Are appropriately set so that a so-called bending vibration that bends in a direction orthogonal to the longitudinal vibration appears symmetrically with respect to the center of the plane. At this time, it is desirable that the resonance frequency of the longitudinal vibration and the resonance frequency of the bending vibration are set so as to be close to each other, and the resonance frequency of the bending vibration is substantially equal to the resonance frequency of the longitudinal vibration, and the difference is 3%. The following is desirable. Further, the length ratio of the long side to the short side of the piezoelectric element 220 is preferably 0.274 or more when the long side is 1. When the length of the piezoelectric element 220 is set to 1 and the length of the short side is made smaller than 0.274, the resonance frequency of the longitudinal vibration becomes larger than the resonance frequency of the bending vibration, and the contact portion In 230, a good elliptical orbit cannot be obtained. At this time, the resonance frequency of the bending vibration is substantially equal to the resonance frequency of the longitudinal vibration. Further, if the difference between the resonance frequencies of both vibrations is greater than 3%, the resonance point of the longitudinal vibration and the resonance point of the bending vibration are separated from each other, and it is not possible to set a vibration frequency at which the amplitudes of both vibrations increase simultaneously. .

  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. 4, the support body 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. 3) formed in a concave shape in the vibration body holding part 400, and is substantially parallel to the direction in which the support body 300 approaches and separates from the rotor 47 at the center in the width direction. The long holes 321 are formed at a plurality of locations (in this embodiment, two locations). A screw 421 (FIG. 3) is disposed through the elongated hole 321, and the screw 421 is screwed into a screw hole 422 formed in the vibrating body holding unit 400. Accordingly, 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 rotor 47 from the position where the contact portion 230 contacts the rotor 47.

  Further, as shown in FIG. 4, in the support body 300, the fixing 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. 4, 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. 3, 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 driving unit 100 will be described. FIG. 5 shows a schematic diagram of the operation of the vibrating body 200. 5A shows the longitudinal vibration of the vibrating body 200, FIG. 5B shows the bending vibration of the vibrating body 200, and FIG. 5C 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. 5B, 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 rotor 47 by pressing the rotor 47 in a part of the elliptical orbit. By repeating this at a predetermined frequency, the rotor 47 rotates in one direction, in this case, clockwise in FIG. 2, at a predetermined rotational speed. Further, when the rotor 47 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. As a result, the rotor 47 rotates in the opposite direction.

  FIG. 6 shows an example of the arrangement of the transport driven roller holder 42. 6A shows a view of the inkjet recording apparatus 10 as viewed from the conveyance unit drive gear 49 side, and FIG. 6B shows a view of the inkjet recording apparatus 10 as viewed from the arrow a side in FIG. 6A. As shown in FIG. 6, the conveyance driven roller holder 42 is provided so as to be rotatable around a rotation shaft 44 that is pivotally supported by the frame 80, and a conveyance driven roller rotation shaft 48 that is a rotation axis of the conveyance driven roller 43. Is supported. The transport driven roller holder 42 has a coil spring 46 inside. One end of the coil spring 46 is supported by the conveyance driven roller holder 42 with a pin or the like, and the other end presses the conveyance driven roller rotating shaft 48. Therefore, the conveyance driven roller 43 presses the conveyance driving roller 41 in the direction of the arrow extending from the conveyance driven roller 43 in FIG. In the form shown in FIG. 6, the transport driven roller 43 is an example of a pressing unit. The vibrating body 200 is disposed on the side facing the direction in which the transport driven roller 43 presses the transport drive roller 41. According to such an arrangement, the rotor 47 connected to the shaft 45 is pressed in the direction approaching the vibrating body 200, so that the vibration of the shaft 45 due to the vibration of the vibrating body 200 is suppressed, and the conveyance drive roller 41 rotates. In this case, the position of the shaft 45 can be stabilized.

  As described above, according to the embodiment shown in FIGS. 1 to 6, the center line along the longitudinal direction of the vibrating body 200 is substantially perpendicular to the tangential direction of the outer periphery of the rotor 47 (in the radial direction of the rotor 47). The tip of the contact portion 230 is in contact with the outer peripheral surface of the rotor 47 in a state where no voltage is applied to the piezoelectric element 220. In addition, the vibrating body holding unit 400 supports the vibrating body 200 with the surface direction of the piezoelectric element 220 of the vibrating body 200 parallel to the surface (the surface of the rotor 47) perpendicular to the shaft 45 that is the rotation axis of the transport driving roller 41. To do.

  In this embodiment, since the piezoelectric element 220 bends and vibrates in the surface direction, the vibration mode can be stabilized as compared with the case where the piezoelectric element 220 bends and vibrates in the thickness direction. In addition, since the driving unit 100 is smaller than an electric motor or the like, the installation space in the ink jet recording apparatus 10 can be reduced. Furthermore, since the driving unit 100 is disposed on the side opposite to the direction in which the conveyance driving roller 41 is pressed by the conveyance driven roller 43 with respect to the conveyance driving roller 41, the vibration of the shaft 45 accompanying the vibration of the vibrating body 200 is reduced. It is restrained and the position of the shaft 45 when the conveyance drive roller 41 rotates can be stabilized.

  Further, as shown in FIG. 6, in the arrangement of the drive unit 100, the rotor 47 and the drive unit 100 are disposed inside the frame 80. Therefore, the liquid ejecting apparatus can be further downsized as compared with the case where the vibrating body 200 is disposed outside the frame 80.

  Further, as shown in FIG. 6, the vibrating body holding unit 400 of the driving unit 100 is fixed to the frame 80. Further, the spring 340 biases the vibrating body 200 and the support body 300 in the direction approaching the rotor 47. Therefore, the contact portion 230 of the vibrating body 200 is pressed against the outer peripheral surface of the rotor 47 with an appropriate biasing force. Accordingly, even if there is a variation between the mounting position of the driving unit 100 and the position of the outer peripheral surface of the rotor 47, the driving force due to the vibration of the vibrating body 200 can be transmitted to the rotor 47 more reliably.

  In the embodiment shown in FIGS. 1 to 6, the rotor 47 and the drive unit 100 are arranged inside the frame 80, but these arrangements are not limited thereto. The rotor 47 and the drive unit 100 may be disposed outside the frame 80. In this case, maintenance such as replacement of the piezoelectric element 220 of the driving unit 100 is facilitated. Further, in the embodiment of FIGS. 1 to 6, the spring 340 of the drive unit 100 may be omitted. In this case, the number of parts can be further reduced.

  FIG. 7 schematically shows another example of the pressing unit 500. FIG. 7A shows a view as seen from the conveyance unit drive gear 49 side in the ink jet recording apparatus 10, and FIG. 7B shows a view as seen from the arrow b side in FIG. 7A. . As shown in FIG. 7, the ink jet recording apparatus 10 includes a spring 510 and a pressing pad 520, and includes a pressing unit 500 that presses the shaft 45 in the direction of gravity (vertically downward). In the following, the spring 510 and the pressing pad 520 schematically show an example of the pressing portion 500, and the specific mode of the pressing portion 500 is not limited to this. In this case, the vibrating body 200 is disposed on the side facing the direction in which the pressing portion 500 presses the shaft 45. According to such an arrangement, the shaft 45 is pressed in the direction of gravity (vertically downward) by its own weight and pressure, and therefore has a backlash with respect to the frame 80 at a portion where the shaft 45 is pivotally supported by the frame 80. Even in this case, the vibration of the shaft 45 accompanying the vibration of the vibrating body 200 can be suppressed, and the position of the shaft 45 when the transport driving roller 41 rotates can be stabilized. Further, the pressing portion 500 may be disposed on the opposite side of the shaft 45 from the side on which the pressing portion 500 in FIG. 7 is disposed.

  FIG. 8 schematically shows still another example of the pressing unit 500. FIG. 8A shows a view from the side of the conveyance unit drive gear 49 in the ink jet recording apparatus 10, and FIG. 8B shows a view from the side of the arrow c in FIG. 8A. . As shown in FIG. 8, the ink jet recording apparatus 10 includes a spring 510 and a pressure pad 520, and the upstream side in the transport direction when the ink jet recording apparatus 10 transports the recording material 19 (of the paper feeding unit 13. The pressing part 500 which presses the shaft 45 in the direction of the side) is provided. In the arrangement shown in FIG. 8, the vibrating body 200 is disposed on the side facing the direction in which the pressing portion 500 presses the shaft 45. According to such an arrangement, the shaft 45 is pressed upstream in the transport direction by pressing by the pressing unit 500, so that the recording material 19 is transported downstream and separated from the transport driving roller 41 and the transport driven roller 43. In addition, it is possible to suppress the conveyance drive roller 41 from vibrating due to the repulsive force. Furthermore, with this arrangement, the vibration of the shaft 45 due to the vibration of the vibrating body 200 can be suppressed, and the position of the shaft 45 when the transport driving roller 41 rotates can be stabilized. Further, the pressing portion 500 and the vibrating body 200 may be disposed on the opposite side of the shaft 45 from the side on which the pressing portion 500 and the vibrating body 200 in FIG. 8 are disposed, respectively.

  FIG. 9 schematically shows still another example of the pressing unit 500. FIG. 9A shows a view from the side of the conveyance unit drive gear 49 in the ink jet recording apparatus 10, and FIG. 9B shows a view from the side of the arrow d in FIG. 9A. . As shown in FIG. 9, the ink jet recording apparatus 10 includes a spring 510 and a pressing pad 520, and is viewed from the shaft 45 toward the portion where the conveyance unit drive gear 49 and the first transmission gear 57 are engaged with each other. The pressing part 500 which presses is provided. In the arrangement shown in FIG. 9, the vibrating body 200 is arranged on the side facing the direction in which the pressing portion 500 presses the shaft 45. According to such an arrangement, the shaft 45 is pressed against the upstream side in the transport direction by the pressing by the pressing unit 500 while being superimposed on the force of pressing the gears due to the engagement of the transport driving gear 49 and the first transmission gear 57. Therefore, even when the shaft 45 is pivotally supported by the frame 80, even when the shaft 45 has a backlash, vibration when the shaft 45 rotates can be suppressed. Furthermore, with this arrangement, the vibration of the shaft 45 due to the vibration of the vibrating body 200 can be suppressed, and the position of the shaft 45 when the transport driving roller 41 rotates can be stabilized. Further, the pressing portion 500 and the vibrating body 200 may be disposed on the opposite side of the shaft 45 from the side on which the pressing portion 500 and the vibrating body 200 in FIG. 9 are disposed, respectively.

  In the embodiment shown in FIGS. 7 to 9, the pressing unit 500 presses the shaft 45 of the transport driving roller 41, but the target to be pressed is not limited to this. Instead, the pressing unit 500 may press the vibrating body 200 of the driving unit 100 toward the transport driving roller 41 side. Thereby, it is possible to stabilize the vibration while accurately setting the position of the transport driving roller 41 in the rotation direction.

  In the embodiment shown in FIGS. 1 to 9, the vibrating body 200 of the driving unit 100 gives a driving force to the conveyance driving roller 41 by making an elliptical motion, but the method of applying the driving force is not limited to this. As another example, the vibrating body 200 of the driving unit 100 may vibrate longitudinally in the plane so that the rotation driving force is applied to the conveyance driving roller 41 in the proximity and separation. In this case, the vibration of the vibrating body 200 is efficiently rotated by shifting the extension line in the vibration direction at the portion where the vibrating body 200 abuts on the transport driving roller 41 from the rotation center of the transport driving roller 41. It can be transmitted as a driving force.

  Here, the ink jet recording apparatus 10 of the present embodiment is an example of a liquid ejecting apparatus. The recording head 24 of the ink jet recording apparatus 10 is an example of a liquid ejecting head of the liquid ejecting apparatus. The ejection port provided in the recording head 24 is an example of an ejection port of the liquid ejection head. However, the embodiments are not limited to these. Another example of the liquid ejecting apparatus is a color filter manufacturing apparatus that manufactures a color filter for a liquid crystal display. In this case, the color material ejecting head of the color filter manufacturing apparatus is an example of the liquid ejecting head. Still another example of the liquid ejecting apparatus is an electrode forming apparatus that forms electrodes such as an organic EL display and an FED (surface emitting display). In this case, the electrode material (conductive paste) ejecting head of the electrode forming apparatus is an example of the liquid ejecting head. Still another example of the liquid ejecting apparatus is a biochip manufacturing apparatus that manufactures a biochip. In this case, the bio-organic substance ejecting head of the biochip manufacturing apparatus and the sample ejecting head as a precision pipette are examples of the liquid ejecting head. The above liquid ejecting apparatus also includes other liquid ejecting apparatuses having industrial applications. The recording object 19 is an object on which recording or printing is performed by jetting a liquid. For example, a recording substrate, a circuit board on which a circuit pattern such as an electrode of a display is printed, a CD on which a label is printed. ROM, preparations on which DNA circuits are printed are included.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

1 is a schematic perspective view of an ink jet recording apparatus 10 that is an embodiment of a liquid ejecting apparatus according to the invention. 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. The top view of the drive part 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. An example of arrangement | positioning of the conveyance driven roller holder 42 is shown. Another example of arrangement | positioning of the press part 500 is shown typically. Another example of arrangement | positioning of the press part 500 is typically shown. Another example of arrangement | positioning of the press part 500 is typically shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Inkjet recording device, 11 Apparatus main body, 13 Paper feed part, 15 Platen, 17 Paper discharge port, 19 Recorded object, 20 Recording part, 22 Carriage, 24 Recording head, 26 Ink cartridge, 30 Timing belt, 32 Carriage motor , 40 Conveying unit, 41 Conveying drive roller, 42 Conveying driven roller holder, 43 Conveying driven roller, 44 Rotating shaft, 45 Shaft, 46 Coil spring, 47 Rotor, 48 Conveying driven roller rotating shaft, 49 Conveying unit driving gear, 50 Transmission Part, 55 shaft, 57 first transmission gear, 59 second transmission gear, 60 discharge part, 61 discharge drive roller, 63 discharge driven roller, 65 shaft, 69 discharge part drive gear, 80 frame, 100 drive part, 200 vibrating body 210 Reinforcing plate 220 Piezoelectric element 221 Electrode 222 electrode, 223 electrode, 224 electrode, 230 contact part, 240 arm part, 241 hole, 251 groove, 252 groove, 260 screw, 300 support, 310 fixing part, 311 screw hole, 320 slide part, 321 long hole, 331 Spring mounting portion, 340 Spring, 350 Conduction pin, 360 Insulating member, 400 Vibration body holding portion, 420 Slide groove, 421 Screw, 422 Screw hole, 430 Locking piece, 431 Contact pin, 450 Screw, 451 Mounting hole, 500 pressing part, 510 spring, 520 pressing pad

Claims (7)

A recording apparatus for recording on the recording material while conveying the recording material,
A conveyance drive roller that rotates when a rotational driving force is applied;
A conveyance driven roller that rotates around the recording material with the conveyance drive roller;
A drive unit that applies a rotational drive force to the transport drive roller,
The drive unit is
A plate-like piezoelectric element and at least one pair of electrodes sandwiching the piezoelectric element in the surface direction are included, and a periodic voltage is applied between each pair of electrodes, thereby providing an outer peripheral surface of the transport driving roller. A vibrating body that contacts and separates in the surface direction of the piezoelectric element;
A recording apparatus comprising: a vibrating body holding unit that supports the vibrating body so that a surface direction of the piezoelectric element is parallel to a plane perpendicular to a rotation axis of the transport driving roller. The transport drive roller has a shaft and a rotor that rotates integrally with the shaft and has a diameter larger than the diameter of the shaft;
The recording apparatus according to claim 1, wherein the vibrating body is in contact with and separated from an outer periphery of the rotor. The shaft is supported by a plate-shaped frame,
The recording apparatus according to claim 2, wherein the vibrating body holding unit supports the vibrating body with a surface direction of the piezoelectric element parallel to a surface direction of the frame.   The recording apparatus according to claim 3, wherein the vibrating body is disposed outside the frame.   The recording apparatus according to claim 3, wherein the vibrating body is disposed inside the frame. A liquid ejecting apparatus that ejects liquid onto the recording material while conveying the recording material,
A conveyance drive roller that rotates when a rotational driving force is applied;
A conveyance driven roller that rotates around the recording material with the conveyance drive roller;
A drive unit that applies a rotational drive force to the transport drive roller,
The drive unit is
A plate-like piezoelectric element and at least one pair of electrodes sandwiching the piezoelectric element in the surface direction are included, and a periodic voltage is applied between each pair of electrodes, thereby providing an outer peripheral surface of the transport driving roller. A vibrating body that contacts and separates in the surface direction of the piezoelectric element;
A liquid ejecting apparatus comprising: a vibrating body holding portion that supports the vibrating body so that a surface direction of the piezoelectric element is parallel to a surface perpendicular to a rotation axis of the transport driving roller. A drive mechanism for rotating the rotating body,
A plate-like piezoelectric element and at least one pair of electrodes sandwiching the piezoelectric element in the surface direction are included, and a periodic voltage is applied between each pair of electrodes, whereby an outer peripheral surface of the rotating body is provided. A vibrating body that contacts and separates in the surface direction of the piezoelectric element;
A driving mechanism comprising: a vibrating body holding portion that supports the vibrating body so that a surface direction of the piezoelectric element is parallel to a plane perpendicular to a rotation axis of the rotating body.

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