JP2007223134A - Liquid jetting apparatus and recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To hardly generate sticking between a conveying driving roller part and a contacting part of a vibrating body coming into contact with the conveying driving roller part by forcibly vibrating the vibrating body of a driving part at a specified timing such as immediately after starting a recording apparatus. <P>SOLUTION: A liquid jetting apparatus has the conveying driving roller part 40 rotating by providing a rotational driving force, a conveying following roller 73 for pinching an article 19 to be recorded and bringing it therewith between the conveying driving roller part 40, the vibrating body 200 and a vibrating body holding part 400 for holding the vibrating body, and is equipped with a driving part 100 providing the rotational driving force to the conveying driving roller part 40. The vibrating body 200 is brought into contact with the conveying driving roller part 40 under a condition that electric power is not provided. A time measuring part 600 for measuring time after feeding of the electric power to the vibrating body 200 is finished, and a forcible vibration controlling part 800 providing the electric power to the vibrating body 200 and forcibly vibrating it at a specified timing after the time measured by the time measuring part 600 passes a specified time, are furthermore provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid ejecting apparatus and a recording apparatus. In particular, the present invention relates to a driving unit that applies a rotational driving force to a conveyance driving roller unit that conveys a recording material in a liquid ejecting apparatus and a recording apparatus.

As a transport unit that transports a recording object of a recording apparatus such as an ink jet recording apparatus, and a driving unit that applies a driving force to the transport unit, for example, a plurality of gears are used for a roller that transports the recording object. There is known a mode in which the driving force of the motor is transmitted through the motor. In such a form, it is desired that the means for generating the driving force such as a motor is smaller and can control the driving force with high accuracy. On the other hand, a rotary drive device using a vibrating body using a piezoelectric element has been proposed (see, for example, Patent Document 1).
JP 2004-166479 A

  The rotary drive device using the vibrator disclosed in Patent Document 1 is very small, and is used, for example, as a film winding mechanism for winding a film of a camera. However, when the vibrating body used in this rotary type driving device is used in the drive unit of the above recording apparatus, the vibrating body is a recording object such as paper in the recording apparatus when the recording apparatus has not been used for a long time. There is a possibility that the portion that comes into contact with the conveyance driving roller that conveys the toner adheres to the surface due to rust, grease, dust, ink mist, or the like, and the vibrating body cannot vibrate in a predetermined vibration mode.

  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 recording unit and the conveyance drive roller unit, and a drive unit that applies a rotational driving force to the conveyance drive roller unit, and sandwiches the plate-like piezoelectric element and the piezoelectric element. However, by including at least a pair of electrodes and applying periodic power between each pair of electrodes, a vibrating body that contacts and separates in the surface direction of the piezoelectric element from the conveyance drive roller portion, and a vibrating body And a driving unit having a vibrating body holding unit to support, the vibrating body is in contact with the conveyance drive roller unit in a state where no electric power is applied, and the time after the supply of electric power to the vibrating body is finished. Time meter to measure And parts, after the measured time has elapsed for a predetermined time by the time measuring unit, further comprising a recording apparatus and a forced vibration control unit for forced vibration giving power to the vibrating body at a predetermined timing is provided. When the drive unit has not been driven for a predetermined time, the vibrating body of the drive unit forcibly vibrates at a predetermined timing, for example, immediately after starting the recording apparatus, so that the conveyance drive roller unit and the conveyance drive roller unit come into contact with each other. Adherence to the contact portion of the vibrating body is unlikely to occur. Therefore, such sticking can prevent the vibration mode of the vibrating body from shifting or becoming unstable when the drive unit drives the transport drive roller unit.

  In the above-described recording apparatus, the forced vibration control unit forcibly vibrates the vibrating body at least on average so that the time of contact with the transport drive roller unit is longer than the time of separation from the transport drive roller unit. It is preferable. As a result, the vibrating body is in contact with the conveyance drive roller unit, so that the braking force applied to the conveyance drive roller unit is difficult to be released, so the conveyance drive roller unit rotates without depending on the rotational drive force by the drive unit. Can be prevented.

  The recording apparatus further includes a load unit that applies a load to the conveyance drive roller unit, and the forced vibration control unit applies a rotational driving force smaller than a load applied to the conveyance drive roller unit by the load unit. The vibrating body may be forced to vibrate so as to be applied. Thus, when the recording material is not transported, the transport driving roller unit does not rotate due to the forced vibration of the vibrating body.

  Further, in the above recording apparatus, the conveyance drive roller unit is rotated from the vibrating body by engaging with the shaft that contacts the recording material, the shaft side gear that is attached to the shaft and rotates integrally with the shaft, and the shaft side gear. It has a drive unit side gear that receives the drive force and transmits it to the shaft side gear, and the forced vibration control unit applies the rotational drive force to the drive unit side gear within the range of backlash between the shaft side gear and the drive unit side gear. The vibrating body may be forced to vibrate to give. Thus, when the recording material is not transported, the transport driving roller unit does not rotate due to the forced vibration of the vibrating body.

  In the recording apparatus, it is preferable that the forced vibration control unit forcibly vibrates the vibrating body in a direction in which the conveyance drive roller unit does not rotate. Thus, when the recording material is not transported, the transport driving roller unit does not rotate due to the forced vibration of the vibrating body.

  The predetermined timing may be when the power is turned on. As a result, when the drive unit has not been driven for a predetermined time, the recording unit is not activated only to forcibly vibrate the vibrating body of the drive unit, and the conveyance drive roller unit and the conveyance drive roller unit are brought into contact with each other. It is possible to prevent sticking from occurring between the contact portion of the vibrating body.

  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 unit that rotates when a rotational driving force is applied, and conveyance driving A transport driven roller that rotates with a recording material sandwiched between the roller section and a drive section that applies a rotational driving force to the transport drive roller section, and includes at least a pair of electrodes sandwiching the plate-like piezoelectric element and the piezoelectric element And a vibrating body that abuts and separates in the surface direction of the piezoelectric element from the conveyance drive roller portion by applying periodic power between each pair of electrodes, and a vibrating body holding that supports the vibrating body A time measuring unit that measures the time from when the supply of power to the vibrating body is finished, the vibrating body being in contact with the conveyance driving roller unit in a state where no power is applied. And time measurement The measured time after a predetermined time has elapsed, further comprising a liquid ejecting apparatus and a forced vibration control unit for forced vibration giving power to the vibrating body at a predetermined timing is provided by. 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 as viewed from the shaft side gear 49 side. The ink jet recording apparatus 10 includes an apparatus main body 12, a paper feeding unit 13 on which a recording material 19 is placed, a conveyance driving roller unit 40 that conveys the recording material 19 of the paper feeding unit 13, and a conveyance driving roller unit 40. A platen 15 that supports the recording material 19 conveyed from below, a recording unit 20 that is arranged above the platen 15 and records on the recording material 19, and discharges the recording material 19 to the paper discharge port 17. And a drive unit 100 that drives the conveyance drive roller 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 12 and rotates by 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 driving roller unit 40 includes a shaft 41, a rotor 47, and a shaft side gear 49, and is disposed between the paper feeding unit 13 and the recording unit 20. The shaft 41 is rotatably supported by the upper frame 80 of the apparatus main body 12. The shaft side gear 49, the upper frame 80, and the rotor 47 are arranged in this order in the axial direction of the shaft 41 from the front side in FIG. The rotor 47 and the shaft side gear 49 are fixedly connected to the shaft 41 with the shaft 41 as a rotation axis. The conveyance driven roller 73 is rotatably supported by the apparatus main body 12 and rotates around the shaft 41.

  The drive unit 100 is disposed on the inner side (the back side in FIG. 2) of the rotor 47 and is fixed to the drive unit fixing frame 85. The drive unit fixing frame 85 is fixed to the lower frame 83. The contact portion 230 that is one end of the drive unit 100 faces a surface farther from the upper frame 80 (the back side in FIG. 2) among surfaces perpendicular to the rotation axis of the disk-shaped rotor 47. Arranged in position. 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 upper frame 80 of the apparatus main body 12. The discharge driven roller 63 is rotatably supported with respect to the apparatus main body 12 and rotates with the discharge drive roller 61.

  The transmission unit 50 transmits the rotational driving force of the conveyance drive roller 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 upper frame 80 of the apparatus main body 12.

  The shaft-side 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 shaft side gear 49 and the first transmission gear 57 are engaged with each other, and the second transmission gear 59 and the discharge portion drive gear 69 are engaged with each other. Therefore, for example, when the shaft side gear 49 rotates clockwise in FIG. 2, the first transmission gear 57 and the second transmission gear 59 rotate counterclockwise in FIG. Rotates clockwise in FIG. As described above, when the shaft 41 rotates clockwise in FIG. 2, the discharge driving roller 61 also rotates clockwise, and the conveyance driven roller 73 and the discharge driven roller that rotate with the shaft 41 and the discharge driving roller 61, respectively. Both 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. As a result, the shaft 41 connected to the rotor 47 is rotationally driven, and the recording material 19 is transported onto the platen 15 with the recording material 19 sandwiched between the shaft 41 and the transport driven roller 73. 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 12. 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 shaft 41 and the transport driven roller 73 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 material 19 on which recording has been performed from the platen 15 to the paper discharge port 17 in conjunction with the shaft 41 and the conveyance driven roller 73.

  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 the present embodiment) are provided in the vibrating body holding unit 400, and are provided at positions corresponding to the mounting holes 451 at positions where the driving unit 100 of the driving unit fixing frame 85 is mounted. It is fixed to the hole with screws 450 and attached.

  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 are formed on both surfaces of the piezoelectric element 220 by plating, sputtering, or vapor deposition of nickel or gold. 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, and form a pair with the electrode 224 with the piezoelectric element 220 interposed therebetween.

  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). These four conduction pins 350 are also electrically connected to an application device 700 described later. 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, 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 applying device 700, 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. 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 way gives an elastic force to the vibrating body 200 and the vibrating body holding part 400 so that they are separated from each other in the longitudinal direction of the vibrating body 200. Therefore, in the ink jet recording apparatus 10, when the vibrating body 200 is not vibrating, the contact portion 230 is in contact with the rotor 47.

  Hereinafter, the operation of the vibrating body 200 in the driving unit 100 will be described. FIG. 5 schematically shows the longitudinal vibration of the vibrating body 200. FIG. 6 schematically shows bending vibration of the vibrating body 200. FIG. 7 shows a vibration trajectory 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 between the electrode 221 and the electrode 224 is mainly in the longitudinal direction as shown in FIG. By expanding and contracting, the piezoelectric element 220 excites longitudinal vibration. Further, as shown in FIG. 6, the piezoelectric element 220 between the electrodes 222 and 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 center of the plane 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. 8 schematically shows the arrangement of the drive unit 100 in the ink jet recording apparatus 10. Here, FIG. 8 is a schematic view of the conveyance driving roller unit 40 of the ink jet recording apparatus 10 as viewed from the paper discharge port 17 side, and the left side diagram is a portion where the driving unit 100 in the right side diagram is arranged. FIG. In the form shown in FIG. 8, the rotor 47 is disposed inside the upper frame 80. The drive unit 100 is driven so that the direction of longitudinal vibration in the vibrating body 200 is parallel to the shaft 41 and the surface direction of the piezoelectric element 220 and the tangential direction of the contact portion of the contact portion 230 of the rotor 47 are parallel. It is fixed to the part fixing frame 85.

  As shown in FIG. 8, the ink jet recording apparatus 10 includes a load portion 900 including a spring 910, a spring contact portion 920, and a shaft stopper 930. As shown in FIG. 8, the spring contact portion 920 is disposed outside the upper frame 80 at the end of the shaft 41 opposite to the side on which the shaft side gear 49 is disposed, and is fixed to the shaft 41. Yes. The spring 910 is disposed between the spring contact portion 920 and the upper frame 80 and applies an urging force to the spring contact portion 920 in a direction away from the upper frame 80. The shaft stopper 930 is disposed between the shaft side gear 49 and the upper frame 80 on the side where the shaft side gear 49 of the shaft 41 is disposed, and is fixed to the shaft 41. The shaft 41 is urged to the right side in FIG. 8 by the urging force. Accordingly, each of the shaft stoppers 930 is urged to the right side in FIG. 8 and is in contact with the outer surface of the upper frame 80. In the ink jet recording apparatus 10 in which the respective units are arranged in this way, the load unit 900 applies a load to the shaft 41 of the transport drive roller unit 40. The magnitude of the load is preferably a magnitude that does not significantly impede the rotation of the shaft 41 by the driving force of the driving unit 100.

  FIG. 9 is a schematic side view of another ink jet recording apparatus 11 as viewed from the shaft side gear 49 side. FIG. 10 schematically shows the arrangement of the drive unit 100 in the ink jet recording apparatus 11. Here, in the ink jet recording apparatus 11 described below, the same components as those of the ink jet recording apparatus 10 shown in FIGS. FIG. 10 is a schematic view of the conveyance drive roller unit 40 of the ink jet recording apparatus 11 as viewed from the paper discharge port 17 side.

  As shown in FIGS. 9 and 10, the ink jet recording apparatus 11 includes a driving unit side gear 43 that is disposed on the outer side of the upper frame 80 and is rotatably supported by the upper frame 80 on the conveyance driving roller unit 40. . The drive unit side gear 43 has a gear shape in which a plurality of teeth are formed on the outer peripheral portion, and meshes with the shaft side gear 49. In the ink jet recording apparatus 11, the drive unit 100 is configured such that, as shown in FIGS. 9 and 10, the direction of longitudinal vibration in the vibrating body 200 of the drive unit 100 is parallel to the rotation axis of the drive unit side gear 43. The element 220 is fixed to the drive unit fixing frame 85 so that the surface direction of the element 220 is parallel to the tangential direction of the portion of the drive unit side gear 43 that is in contact with the contact portion 230. The drive unit side gear 43 receives a rotational driving force from the vibrating body 200 of the drive unit 100 and transmits it to the shaft side gear 49.

  As shown in FIGS. 8 and 10, the ink jet recording apparatus 10 and the ink jet recording apparatus 11 include a time measurement unit 600, an application device 700, and a forced vibration control unit 800. The drive unit 100 of the ink jet recording apparatus 10 and the ink jet recording apparatus 11 is electrically connected to the applying device 700. When an AC voltage is applied from the applying device 700 to the piezoelectric element 220 of the vibrating body 200, the driving unit 100 of the ink jet recording apparatus 10 drives the rotor 47 to rotate, and the driving unit 100 of the ink jet recording apparatus 11 drives. The part side gear 43 is rotationally driven.

  The time measuring unit 600 is the time after the application of the voltage to the vibrating body 200 is completed, that is, the driving unit 100 rotates the rotor 47 of the ink jet recording apparatus 10 or the driving unit side gear 43 of the ink jet recording apparatus 11. Measure the time since the drive was stopped. Furthermore, the time measuring unit 600 outputs a signal indicating that the predetermined time has passed to the forced vibration control unit 800 when the measured time has passed a predetermined time. When a signal indicating that a predetermined time has elapsed from the time measuring unit 600 is input, the forced vibration control unit 800 controls the applying device 700 at a predetermined timing to apply a voltage to the driving unit 100, thereby causing the vibrating body 200 to move. Force vibration. Here, the forced vibration means an operation of vibrating the vibrating body 200 when the ink jet recording apparatus 10 and the ink jet recording apparatus 11 are not performing a recording operation.

  For example, when the ink jet recording apparatus 10 and the ink jet recording apparatus 11 are not used for a long time, the predetermined time is when the contact portion 230 and the rotor 47 or the drive portion side gear 43 are not relatively moved. In addition, a time shorter than the time in which the tip of the contact portion 230 and the contact surface of the rotor 47 or the contact surface of the drive unit side gear 43 are fixed by rust, grease, ink mist or the like is set. This predetermined time is stored in the time measuring unit 600 at the time of factory shipment, for example.

  The predetermined timing is, for example, when the ink jet recording apparatus 10 and the ink jet recording apparatus 11 are activated after a predetermined time has elapsed (when the power is turned on). In addition, the predetermined timing may be immediately after elapse of the predetermined time when the ink jet recording apparatus 10 and the ink jet recording apparatus 11 are being activated when the predetermined time elapses. Further, the predetermined timing may be before the printing when a request for printing is made to the ink jet recording apparatus 10 and the ink jet recording apparatus 11 after a predetermined time has elapsed. As a result, it is possible to prevent the tip of the contact portion 230 and the contact surface of the rotor 47 or the contact surface of the drive unit side gear 43 from sticking to each other. Alternatively, it is possible to prevent the vibration mode of the vibrating body 200 from shifting or becoming unstable when the drive unit side gear 43 is rotationally driven. The information on the predetermined timing is stored in the forced vibration control unit 800 at the time of factory shipment, for example.

  By the way, in the ink jet recording apparatus 10 and the ink jet recording apparatus 11, the contact portion 230 of the vibrating body 200, which is one end of the driving unit 100, is in a state where no voltage is applied to the vibrating body 200 from the applying device 700. 47 or the drive unit side gear 43. In this state, the driving unit 100 applies a braking force to the rotor 47 so that the conveyance driving roller unit 40 including the rotor 47 or the driving unit side gear 43 does not rotate regardless of the rotational driving force by the driving unit 100. Yes.

  Therefore, in each of the ink jet recording apparatus 10 and the ink jet recording apparatus 11, the forced vibration control unit 800 controls the applying device 700 to apply a voltage to the driving unit 100 to forcibly vibrate the vibrating body 200. A voltage having an amplitude as small as possible can be applied to the vibrating body 200 to the extent that adhesion between the tip of the contact portion 230 and the contact surface of the rotor 47 can be prevented. In this case, for example, the vibrating body 200 is forcibly vibrated so that at least the average time of contact with the rotor 47 is longer than the time of separation from the rotor 47. As a result, the braking force applied to the rotor 47 by the vibrating body 200 is difficult to be released, so that the rotor 47 can be prevented from rotating without depending on the rotational driving force by the driving unit 100.

  In addition, in the minute vibration in each of the ink jet recording apparatus 10 and the ink jet recording apparatus 11 or instead, the forced vibration control unit 800 controls the application device 700 when the vibrating body 200 is forcedly vibrated. Thus, an AC voltage is applied only between the electrode 221 and the electrode 224 among the electrodes 221, 222, 223, and 224 of the piezoelectric element 220 of the vibrating body 200. Therefore, since the piezoelectric element 220 excites only the longitudinal vibration and approaches and separates in the normal direction of the rotor 47, the rotor 47 does not rotate when the vibrating body 200 is forcibly vibrated. Accordingly, when the ink jet recording apparatus 10 and the ink jet recording apparatus 11 do not perform a recording operation, the rotor 47 does not rotate due to the forced vibration of the vibrating body 200.

  In the ink jet recording apparatus 10, the forced vibration control unit 800 controls the application device 700 to apply a voltage to the drive unit 100 to forcibly vibrate the vibrating body 200. The vibrating body 200 may be forcibly vibrated so as to give the driving unit side gear 43 a rotational driving force smaller than the load applied to the driving unit side gear 43. Thereby, when the recording material 19 is not transported, the shaft 41 does not rotate due to the forced vibration of the vibrating body 200.

  In the ink jet recording apparatus 11, the forced vibration control unit 800 controls the application device 700 to apply a voltage to the drive unit 100 to forcibly vibrate the vibrating body 200. The vibrating body 200 may be forcibly vibrated so as to apply a rotational driving force to the drive unit side gear 43 within a range of backlash with the gear 43. Thereby, when the recording material 19 is not transported, the shaft 41 does not rotate due to the forced vibration of the vibrating body 200.

  In the embodiment shown in FIGS. 1 to 10, the driving unit 100 is arranged so as to apply a rotational driving force close to and away from a surface of the rotor 47 perpendicular to the rotation axis. This arrangement is not limited to this. As another example, the driving unit 100 may be arranged so as to apply a rotational driving force close to and away from the outer peripheral surface of the rotor 47, that is, a surface parallel to the rotation axis.

  Here, the ink jet recording apparatus 10 and the ink jet recording apparatus 11 of the present embodiment are examples of a liquid ejecting apparatus. The recording head 24 of the ink jet recording apparatus 10 and the ink jet recording apparatus 11 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 includes 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 as viewed from the shaft side 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 longitudinal vibration of the vibrating body 200 is typically shown. The bending vibration of the vibrating body 200 is typically shown. The vibration locus of the contact part 230 is shown. An arrangement of the drive unit 100 in the ink jet recording apparatus 10 is schematically shown. A schematic side view of another ink jet recording apparatus 11 is shown. An arrangement of the drive unit 100 in the ink jet recording apparatus 11 is schematically shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10, 11 Inkjet recording apparatus, 12 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 Conveyance drive roller section, 41 Shaft, 43 Drive section side gear, 47 Rotor, 49 Shaft side gear, 50 Transmission section, 55 Shaft, 57 First transmission gear, 59 Second transmission gear, 60 Discharge section, 61 Discharge drive roller, 63 Discharge driven roller, 65 shaft, 69 Discharge drive gear, 73 Conveyance driven roller, 80 Upper frame, 83 Lower frame, 85 Drive fixed frame, 100 Drive unit, 200 Vibration body, 210 Reinforcement plate, 220 Piezoelectric element, 221 electrode, 222 electrode, 223 electrode 224 electrode, 230 contact portion, 240 arm portion, 241 hole, 251 groove, 252 groove, 260 screw, 300 support, 310 fixing portion, 311 screw hole, 320 slide portion, 321 long hole, 331 spring mounting portion, 340 Spring, 350 Conduction pin, 360 Insulating member, 400 Vibration body holding part, 420 Slide groove, 421 Screw, 422 Screw hole, 430 Locking piece, 431 Contact pin, 450 Screw, 451 Mounting hole, 600 Time measuring part, 700 Application device, 800 Forced vibration control section, 900 Load section, 910 Spring, 920 Spring contact section, 930 Shaft stop section

Claims (7)

A recording apparatus for recording on the recording material while conveying the recording material,
A conveyance drive roller section that rotates when a rotational driving force is applied;
A transport driven roller that rotates around the recording material with the transport drive roller unit;
A driving unit that applies a rotational driving force to the transport driving roller unit, and includes at least one plate-like piezoelectric element and a pair of electrodes sandwiching the piezoelectric element, and a periodic power between the pair of electrodes. A vibrating body that contacts and separates in the surface direction of the piezoelectric element with respect to the transport driving roller, and a driving unit having a vibrating body holding unit that supports the vibrating body,
The vibrating body is in contact with the transport driving roller portion in a state where power is not applied,
A time measuring unit for measuring a time after the supply of power to the vibrating body is completed;
A recording apparatus, further comprising: a forced vibration control unit that applies power to the vibrating body and forcibly vibrates at a predetermined timing after the time measured by the time measurement unit has passed a predetermined time.   The forced vibration control unit forcibly vibrates the vibrating body at least on average so that the time of contact with the transport drive roller unit is longer than the time of separation from the transport drive roller unit. The recording apparatus according to 1. A load unit that applies a load to the transport drive roller unit;
The recording apparatus according to claim 1, wherein the forced vibration control unit forcibly vibrates the vibrating body so as to apply a rotational driving force to the transport driving roller unit that is smaller than a load applied to the transport driving roller unit by the load unit. . The conveyance drive roller unit includes a shaft that contacts the recording material, a shaft-side gear that is attached to the shaft and rotates integrally with the shaft, and meshes with the shaft-side gear. Receiving and transmitting the shaft side gear to the drive unit side gear,
2. The forced vibration control unit according to claim 1, wherein the vibration body is forcibly vibrated so as to apply a rotational driving force to the driving unit side gear within a range of backlash between the shaft side gear and the driving unit side gear. Recording device.   The recording apparatus according to claim 1, wherein the forced vibration control unit forcibly vibrates the vibrating body in a direction in which the transport driving roller unit does not rotate.   The recording apparatus according to claim 1, wherein the predetermined timing is when power is turned on. A liquid ejecting apparatus that ejects liquid onto the recording material while conveying the recording material,
A conveyance drive roller section that rotates when a rotational driving force is applied;
A transport driven roller that rotates around the recording material with the transport drive roller unit;
A driving unit that applies a rotational driving force to the transport driving roller unit, and includes at least one plate-like piezoelectric element and a pair of electrodes sandwiching the piezoelectric element, and a periodic power between the pair of electrodes. A vibration body that contacts and separates in the surface direction of the piezoelectric element from the transport drive roller section, and a drive section having a vibration body holding section that supports the vibration body,
The vibrating body is in contact with the transport driving roller portion in a state where power is not applied,
A time measuring unit for measuring a time after the supply of power to the vibrating body is completed;
A liquid ejecting apparatus, further comprising: a forced vibration control unit that applies power to the vibrating body and forcibly vibrates at a predetermined timing after the time measured by the time measuring unit has passed a predetermined time.

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