JP2004292167A - Carrying route changing device of recorded medium, double-sided recording device, and carrying route changing device of jetted medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carrying route changing device of a recorded medium in which the driving of a reversal drive roller for reversing the moving direction of the recorded medium can be interlocked with the guide of the end part of the recorded medium to a second route side. <P>SOLUTION: A force can be selectively transmitted from a first planetary gear 85 and a second planetary gear 87 to a flap drive cam 129. When the force is transmitted from the second planetary gear, the flap drive cam operates so as to be moved in a contact state by the energizing force of an energizing means 127. When the force is transmitted from the first planetary gear, the flat member 123 operates so as to be moved in a release state against the energizing force of the energizing means 127. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a double-sided recording device. Furthermore, the present invention relates to a liquid ejecting apparatus such as an ink jet type recording apparatus which ejects a liquid such as ink from its head and ejects the liquid to a medium to be ejected.
Here, the liquid ejecting apparatus is not limited to a recording apparatus such as a printer, a copying machine, and a facsimile that uses an ink jet recording head and discharges ink from the recording head to perform recording on a recording medium. A liquid corresponding to the use is ejected from a liquid ejecting head corresponding to the recording head to an ejection target medium corresponding to a recording medium, and is used in a sense including a device for attaching the liquid to the ejection target medium.
As the liquid ejecting head, in addition to the recording head, a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, and an electrode material (conductive paste) used for forming an electrode such as an organic EL display or a surface emitting display (FED). Examples include an ejection head, a biological organic matter ejection head used for biochip production, and a sample ejection head as a precision pipette.

  In a conventional double-sided recording apparatus, recording heads are arranged above and below a conveyance path of a recording medium, and recording is performed on the front and back surfaces of the recording medium by two recording heads during conveyance of the recording medium. Had gone. Such a double-sided recording apparatus is disclosed in, for example, Patent Document 1.

  However, the cost of the conventional double-sided recording apparatus is increased by the provision of two recording heads. In order to perform recording on both sides of a recording medium with a single recording head, the present inventors require a first path and a second path which is a traveling direction opposite to the traveling direction of the first path. A device having a reversing mechanism for transferring a recording medium from the first path to the second path has been developed. After recording by the recording unit on the first path, the recording medium is guided to the second path and reversed by the apparatus. Then, recording is performed again by the recording unit.

  In such an apparatus, when guiding the recording medium to the second path, the trailing end of the recording medium in the first path in the traveling direction is shifted to the second path side, and in the second path, The recording medium must travel in the direction opposite to the traveling direction in the first path. However, unless the movement of the end of the recording medium and the reversal of the traveling direction are performed with good timing, the throughput will be reduced.

JP-A-2002-154245

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a recording medium conveyance path changing device that interlocks the driving of a reversing drive roller for reversing the traveling direction of a recording medium and the guidance of the end of the recording medium to a second path side. It is an object of the present invention to provide a double-sided recording device and a device for changing a conveyance path of a medium to be ejected.

  In order to achieve the above object, a recording medium transport path changing apparatus according to a first aspect of the present invention includes a recording unit, a rotation drive source capable of switching between forward and reverse rotation, A recording medium reversing mechanism for inverting the recording medium after recording in the recording section and guiding the recording medium to the recording section again for recording on the second surface of the recording medium, The recording medium reversing mechanism includes: 1) a first path that defines the traveling direction of the recording medium during recording on the recording medium; and 2) a rear end of the recording medium in the first path is a front end. A second path for guiding the recording medium in the reverse direction, and 3) rotatable in both forward and reverse directions to switch the recording medium from the first path to the second path. And 4) the reversing drive roller in the second path. A pick-up driving roller provided downstream of the roller; 5) a first position at which the recording medium can be guided to the first path; and a rear end of the recording medium after the first path conveyance, on the second path side. A pivoting member which is rotatable between a second position to be directed to the front side and a lower end side of which is provided with a pickup driven roller which can abut on the above-mentioned driving roller; and 6) the rotary member is provided at one end side. A cam follower is formed at the other end side, and has a swing shaft between the one end side and the other end side, and urges the welcome driven roller to swing in a direction to contact the welcome drive roller. A flap member provided with an urging means, wherein the double-sided recording apparatus includes: 1) a first drive transmission system for transmitting the drive force of the rotary drive source to the reversing drive roller via a train of gears that are always meshed with each other. And 2) the rotary drive source branched from the first drive transmission system. A second drive transmission system for transmitting a driving force to the pick-up drive roller via a planetary gear mechanism such that the pick-up drive roller rotates forward regardless of the rotational drive direction of the rotary drive source; (2) The swing of the flap member around the swing shaft is controlled by the driving force of the rotary drive source transmitted to the drive transmission system, so that the contact driven roller contacts the contact drive roller. State and a flap drive cam for switching between a release state in which the pick-up driven roller is separated from the pick-up drive roller, and wherein the planetary gear mechanism rotates in two directions around a sun gear and the same rotation axis as the sun gear. A rotating arm having a first arm portion and a second arm portion extending therewith; a first planetary gear and a second planetary gear provided at a tip of each of the arm portions and meshing with the sun gear; and a rotation direction of the sun gear To Accordingly, the first planetary gear and the second planetary gear are provided with a first connection gear and a second connection gear respectively meshable with each other, and the flap drive cam is meshable only with the second planetary gear. A flap operating gear formed on a part of the outer periphery, protruding from a surface located inside the tooth, and having a cam operating portion capable of supporting the cam follower; and A flap return gear that rotates and has a tooth portion meshing with the first planetary gear and the second planetary gear around the entire periphery except the toothless portion. When the second planetary gear rotates toward the flap operating gear in the release state, the second planetary gear is formed at a position where the second planetary gear meshes with the second planetary gear. Gear is hula When pivoted to flop back gear side, in which the first planetary gear is characterized in that it is formed around the position.

  According to the first aspect of the present invention, when the second planetary gear meshes with the second connection gear, the second planetary gear also meshes with the tooth of the flap operating gear and the tooth of the flap return gear. When the second planetary gear rotates in this state, the flap operation gear rotates together with the flap return gear, and the cam action portion supports the cam follower, while the second planetary gear is driven by the teeth of the flap operation gear. The sharp rotation of the flap operating gear due to the urging force of the urging means is suppressed. When the flap operating gear rotates to a position where the tooth portion of the flap operating gear is disengaged from the second planetary gear, the cam follower pushes the cam operating portion by the urging force of the urging means, and rotates the flap operating gear at a stretch. As a result, the flap member and the rotating member rotate at a stretch around the swing shaft, and the contact driven roller comes into contact with the contact drive roller.

  On the other hand, when the first planetary gear comes into mesh with the flap return gear and the first connection gear after the contact state, the flap return gear rotates, and the cam operating portion of the flap operation gear biases the cam follower. Start pushing against the bias of the means. Thereafter, the state in which the first planetary gear meshes with the flap return gear is changed to a state in which the first planetary gear faces the missing tooth portion. As a result, the flap return gear can freely rotate, so that the cam follower pushes the cam operating portion, and the cam follower is supported on the cam operating portion. By such a series of operations, the flap member rotates around the pivot axis, and returns to the release state in which the welcome driven roller is separated from the welcome drive roller again.

  Further, according to a second aspect of the present invention, in the first aspect, the cam follower and the cam action portion are formed flat, and in the release state, The cam follower is supported by the cam operating portion in a state parallel to the cam operating portion. According to this aspect, in the release state, the cam follower comes to be mounted on the cam operating portion in a parallel state, so that a stable support state of the cam follower can be realized.

Further, in the apparatus for changing a conveyance path of a recording medium according to a third aspect of the present invention, in the first or second aspect, the flap member may be moved in a direction in which the welcome driven roller comes into contact with the welcome drive roller. It is characterized in that it is provided with a brake means for relaxing the speed at the time of swinging.
According to this aspect, since the brake means is provided to reduce the speed at which the flap member swings, the collision sound generated from the device when the welcome driven roller comes into contact with the welcome drive roller is suppressed. can do.

Further, in the apparatus for changing a recording medium conveyance path according to a fourth aspect of the present invention, in the third aspect, the brake means urges the flap operating gear in a rotation axis direction of the flap operating gear. It is characterized by being constituted by a pressing spring.
According to this aspect, since the brake means is constituted by the pressing spring for urging the flap operating gear in the direction of the rotation axis, the brake means can be configured simply and at low cost.

  Further, in the transport path changing device for a recording medium according to the fifth aspect of the present invention, in any one of the first to fourth aspects, the apparatus is formed to have a shape extending in the width direction of the recording medium. In the flap member, the cam follower and the urging means are provided at one end in the width direction, the urging means is provided at the other end, and a rigid body extending in the width direction of the recording medium is provided. And

  According to this aspect, the flap member having a shape extending in the width direction of the recording medium is provided with the cam follower and the urging means at one end in the width direction and the urging means at the other end. Therefore, the flap member tends to twist. Therefore, for example, when the flap member swings when the plurality of welcome driven rollers are provided across the width direction, some of the welcome driven rollers may be in contact with the welcome drive roller, An uneven state may occur, for example, such that the other driven roller does not come into contact with the driven roller. Further, in the case where the recording medium is guided by the flap member, the posture of the flap member with respect to the recording medium in the width direction of the recording medium is not uniform, so that a paper jam or the like may occur. . However, since the flap member is provided with a rigid body extending in the width direction, the tendency of twisting is suppressed or reduced, and the occurrence of the above-described problems can be prevented.

  Further, according to the sixth aspect of the present invention, there is provided the recording medium transport path changing device according to any one of the first to fifth aspects, wherein the recording medium is used for recording on the second surface of the recording medium. A transport roller for second surface recording, which is disposed downstream of the pick-up drive roller in the transfer path and conveys the recording medium to the downstream side, and is driven to rotate, the reverse drive roller, the pick-up drive roller, A conductive wire electrically connected to a rotating shaft of a roller group including a two-sided recording conveying roller and connected to a grounding means, wherein a bent portion is formed in a part of the conductive wire. The bent portion is fitted into a hole provided in a part of the transport path changing device, so that the conductive wire is attached so as to extend from the hole to the roller group. .

  According to this aspect, a bent portion is formed in a part of the conductive wire that removes the electric charge from the rotating shaft of the roller group, and the bent portion is fitted into the hole, so that the conductive wire is removed from the hole through the roller. Since it is attached so as to extend to the group, even when a long conductive wire is used, the dimensional tolerance is determined based on the distance from the hole to the roller group. Error can be kept small, and the mounting workability becomes easy. In addition, since the mounting can be performed simply by fitting the bent portion into the hole, the mounting workability is also facilitated, and the workability at the time of removal is also facilitated.

  According to a seventh aspect of the present invention, there is provided an apparatus for changing a conveyance path of a recording medium, comprising: a recording unit; a rotation drive source capable of switching between forward and reverse rotation; and recording on the first surface of the recording medium by the recording unit. A recording medium reversing mechanism for reversing the recording medium and guiding the recording medium to the recording section again for recording on the second surface of the recording medium. The mechanism includes: 1) a first path that defines the traveling direction of the recording medium during recording on the recording medium; and 2) a recording medium with the rear end of the recording medium in the first path being the front end. A second path for guiding the traveling direction in the reverse direction, and 3) a reversing drive roller rotatable in both forward and reverse directions for switching the recording medium from the traveling direction on the first path to the traveling direction on the second path. 4) downstream of the reversing drive roller in the second path A pick-up drive roller provided; 5) a first position at which the recording medium can be guided to the first path; and a second position for causing the rear end of the recording medium after the first path conveyance to face the second path. A rotatable member which is rotatable between the first and second positions, and which has a pickup driven roller at the lower end which can contact the pick-up driving roller; and 6) a rotatable member provided at one end and at the other end. A cam follower is formed, has a swing shaft between the one end side and the other end side, and includes biasing means for biasing the welcome driven roller to swing in a direction in which it contacts the welcome drive roller. A flap member, wherein the double-sided recording apparatus includes: 1) a first drive transmission system for transmitting the driving force of the rotary drive source to the reversing drive roller via a train of gears that are always meshed with each other; The driving force is branched from the first drive transmission system, and the driving force of the rotary drive source is transmitted to the planetary gear. Via a mechanism, a second drive transmission system for transmitting to the pick-up drive roller such that the pick-up drive roller rotates forward regardless of the rotational drive direction of the rotary drive source; and 3) a transmission to the second drive transmission system. The rotation of the flap member around the swing shaft is controlled by the driving force of the rotation drive source, and the contact state in which the welcome driven roller comes into contact with the welcome drive roller; A flap drive cam for switching between a release state in which the roller is separated from the pick-up drive roller, wherein the planetary gear mechanism includes a sun gear, a first arm portion extending in two directions rotating around the same rotation axis as the sun gear, and A rotating arm having a second arm, a first planetary gear and a second planetary gear provided at the tip of each arm and meshing with the sun gear, and the first planetary gear according to the rotation direction of the sun gear; Planet A first connection gear and a second connection gear that are meshable with a gear and a second planetary gear, respectively, and the flap drive cam is selectively driven from the first planetary gear and the second planetary gear; The flap drive cam is operable to transfer the flap member to the contact state by the urging force of the urging means when driving is transmitted from the second planetary gear. When the drive is transmitted from the gear, the flap member operates to shift to the release state against the urging force of the urging means. According to this aspect, the same operation and effect as in the first aspect can be expected.

  Further, a recording apparatus according to the present invention includes the transport path changing device for a recording medium according to any one of the first to seventh aspects. According to this aspect, since the transition from the release state to the contact state can be made in conjunction with the switching of the reversing drive roller from normal rotation to reverse rotation, the recording medium is smoothly conveyed without stagnation in the middle.

  The apparatus for changing the transport path of a medium to be ejected according to the present invention includes an ejecting unit, a rotary drive source capable of switching between forward and reverse rotations, and inverting the medium to be ejected after ejecting the first surface of the medium by the ejecting unit. And a jetting medium reversing mechanism for guiding the jetting medium to the jetting section again for jetting the jetting medium to the second surface. A first path that defines the direction of travel of the medium to be ejected during ejection to the medium to be ejected; and 2) reverses the direction of travel of the medium to be ejected so that the trailing end of the medium in the first path is the front end. 3) a reversing drive roller rotatable in both forward and reverse directions to switch the medium to be ejected from the traveling direction on the first path to the traveling direction on the second path; Provided downstream of the reversing drive roller in two paths And 5) a first position at which the medium to be ejected can be guided to the first path, and a second position at which the trailing end of the medium to be ejected after transporting the first path is directed toward the second path. A pivoting member having a pivoting driven roller at the lower end side capable of abutting on the pivoting drive roller; and 6) a pivoting member at one end side and a cam follower at the other end side. A flap member having a swing shaft formed between the one end side and the other end side, and having a biasing means for biasing the welcome driven roller to swing in a direction in which it comes into contact with the welcome drive roller. The two-sided liquid ejecting apparatus includes: 1) a first drive transmission system that transmits the driving force of the rotary drive source to the reversing drive roller via a train of gears that are always meshed with each other; (1) The driving force is branched from the drive transmission system, and the driving force of the rotary drive source is transmitted to the planetary gear mechanism. And a second drive transmission system for transmitting the pick-up drive roller to rotate so as to rotate forward regardless of the rotational drive direction of the rotary drive source; and 3) a transmission to the second drive transmission system. The driving force of the rotary drive source controls the swing of the flap member around the swing shaft, and the contact state in which the welcome driven roller contacts the welcome drive roller, and the welcome driven roller is A flap drive cam for switching between a release state and a release state, wherein the planetary gear mechanism includes a sun gear, a first arm portion extending in two directions that rotate around the same rotation axis as the sun gear, and a second arm portion. A rotating arm having an arm portion; a first planetary gear and a second planetary gear provided at the tip of each of the arm portions and meshing with the sun gear; and the first planetary gear according to a rotation direction of the sun gear. as well as The second planetary gear includes a first connection gear and a second connection gear that can mesh with each other, and the flap drive cam has a tooth portion that can mesh only with the second planetary gear on a part of the outer periphery. A flap operating gear having a cam acting portion formed and protruding from a surface located inside the tooth portion and capable of supporting the cam follower; and rotating integrally with the flap operating gear to remove the toothless portion. A flap return gear having teeth formed thereon that mesh with the first planetary gears and the second planetary gears around all but a second planetary gear in the release state. When the gear rotates toward the flap operation gear, the gear is formed at a position meshing with the second planetary gear, and the tooth portion of the flap return gear rotates the first planetary gear toward the flap return gear in the release state. Moved To, and is characterized in that the first planetary gear is formed around the position.

  Hereinafter, an embodiment of a recording medium transport path changing apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view showing a main part of an ink jet type double-sided recording apparatus which is an example of a double-sided liquid ejecting apparatus to which a recording medium conveyance path changing apparatus according to the present invention is applied, and FIG. FIG. 3 is a side view of a wheel train showing a state of rotation, FIG. 3 is a perspective view showing a structure around a third gear and a fourteenth gear, and FIG. It is a side view of a train wheel showing a situation. In the ink jet type double-sided recording apparatus, a sheet P is used as a medium to be ejected or a recording medium.

  In FIG. 1, reference numeral 1 denotes a main part of an ink jet type double-sided recording apparatus. The main part 1 is provided with a recording device section 3 and a reversing section 5. Although not shown, a feeding unit is provided below the main unit 1, and cut-sheet paper for double-sided recording can be supplied from the feeding unit to the recording device unit 3 via the sheet feeding path 7. I have.

  The recording device section 3 includes a feed roller 9, a carriage 11, and a discharge roller 13. The feed roller 9 is composed of a feed drive roller 15 and a feed driven roller 17, and the feed drive roller 15 is rotatable in both forward and reverse directions by a drive mechanism described later. It can be performed. The feed driven roller 17 is provided at the tip of a roller urging member 21 whose tip is urged toward the feed drive roller 15 by a torsion coil spring 19, and is always urged by the feed drive roller 15 with a constant urging pressure. ing.

  A recording head 23 corresponding to an ejection unit or a recording unit is mounted on the carriage 11, and the carriage 11 reciprocates in a direction (main scanning direction) orthogonal to the feeding direction, so that the recording head 23 performs main scanning. Scanning for recording in the direction is possible.

  A platen 25 is provided at a position facing the recording head 23. The platen 25 has a function of supporting the sheet from below when printing is performed on the sheet by the recording head 23. The distance between the recording head 23 and the platen 25, that is, the paper gap, can be appropriately adjusted according to the thickness of the paper by moving the carriage 11 supporting the recording head 23 in a direction perpendicular to the paper transport path. Has become. When the paper gap is properly adjusted, high-quality printing is performed while the paper smoothly passes over the platen 25.

The paper printed by the recording head 23 is sequentially discharged by the discharge roller 13.
The discharge roller 13 is composed of a discharge drive roller 27 and a discharge notch roller 29, and has a mechanism in which the sheet is pulled out by the rotation of the discharge drive roller 27 and discharged upward. The discharge drive roller 27 can be rotated in both forward and reverse directions by a drive mechanism described later, similarly to the feed drive roller 15.

  Next, the configuration of the reversing unit 5 will be described. The sheet fed from the feeding unit to the recording device unit 3 via the sheet feeding path 7 is recorded on the first surface by the recording head 23, and then reversed through the points 31, 33, 35, and 37, and Are returned to the recording head 23 in the opposite state, and are recorded on the second surface opposite to the first surface, and then ejected. In the present invention, a path while the moving direction of the sheet when recording on the first surface is continued, that is, from the point 37 to the point 33 via the recording head 23 is defined as a first path 38, and the recording is performed on the first surface. The path after the sheet moving direction is switched in the opposite direction, that is, the path defined by the points 33, 35, and 37 is referred to as a second path 40.

  The reversing unit 5 having such a sheet reversing function includes a reversing drive roller 39 provided near the uppermost part thereof, a pick-up drive roller 41 located immediately below the reversal drive roller 39, and a pick-up drive roller 41 positioned below the pick-up drive roller 41. An intermediate drive roller 43 is provided, and an immediately preceding drive roller 45 is provided in the second path 40 immediately before the point 37 where the sheet feeding path 7 joins the first path 38. A reverse driven roller 47 is provided at a position facing the reverse drive roller 39, an intermediate driven roller 49 is provided at a position facing the intermediate drive roller 43, and a front driven roller 49 is provided at a position facing the immediately preceding drive roller 45. A roller 51 is provided.

  The reversing drive roller 39 is rotatable in both forward and reverse directions by a drive mechanism to be described later. On the other hand, the pickup drive roller 41, the intermediate drive roller 43, and the immediately preceding drive roller 45 are rotated counterclockwise in FIG. It is rotatable only in the direction of sending out to the two paths 40. A paper guide driven roller 46 is provided at a position facing the immediately preceding drive roller 45 so as to overlap the immediately preceding driven roller 51. The paper guide driven roller 46 defines the upper surface side of the second half of the second path 40. The paper P is guided along the paper guide driven roller 46 to the feed roller 9, and the curvature of the paper guide driven roller 46. The sheet P is forcibly curved along the direction of the arrow, thereby exhibiting a decurling operation of the sheet curved during the sheet conveyance. In particular, as will be described later, since the sheet P temporarily stops around the sheet guide driven roller 46, the decurling action is correspondingly large. The intermediate drive roller 43 and the immediately preceding drive roller 45, which are driven to rotate, are arranged downstream of the contact drive roller 41 in the paper transport path when printing on the second surface of the paper, and transport the paper downstream. This constitutes a “second surface recording transport roller”.

  At a position adjacent to the reversing driven roller 47, a rotating member 57 rotatable in a direction indicated by an arrow 55 is provided. A receiving driven roller 59 is provided which can be brought into pressure contact with the receiving drive roller 41 when rotated. Further, a guide member 61 is provided which extends downward with the vicinity of the reversing drive roller 39 as a rotation fulcrum. The guide member 61 is similarly configured to rotate toward the pick-up drive roller 41 when the rotary member 57 turns toward the pick-up drive roller 41, and the opening 63 formed in the guide member 61 at the time of rotation. A part of the drive roller 41 protrudes from the drive roller 59 and comes into contact with the driven roller 59. In the present invention, the switching between the contact state in which the pickup driven roller 59 contacts the pickup drive roller 41 and the release state in which the pickup driven roller 59 separates from the pickup drive roller 41 is interlocked with the switching of the rotation direction of the reversing drive roller 39. This will be described later.

  A paper detection device 65 is provided in front of the feed drive roller 15. As will be described later, the sheet detecting device 65 functions as a sensor for detecting the leading end of the sheet after the sheet is inverted and returning the drive motor from the reverse rotation to the normal rotation.

  Next, the driving mechanism of each roller will be described with reference to FIGS. In FIG. 2, reference numeral 67 denotes a rotation shaft of the discharge drive roller 27, and a first drive gear 69 is fixed to the rotation shaft 67. The first drive gear 69 further meshes with a drive gear 71. The rotation shaft 67 of the first drive gear 69 is connected to an output shaft of a drive motor (not shown). All the trains described below use this drive motor as a rotational drive source, and all the rollers described above are also rotationally driven by the drive force of the drive motor. The normal rotation and the reverse rotation of the drive motor are controlled by the control device 70.

  The feed drive roller 15 is not shown in FIG. 2, but the rotary drive force is directly transmitted to the feed drive roller 15 via a first drive gear 69 and a plurality of gear trains which are always meshed with the first drive gear 69. It has become. A fourth gear 79 is provided on the rotation shaft 74 of the reversing drive roller 39, and the rotation driving force of the drive gear 71 is applied to the third gear freely rotating around the second gear 75 and the rotation shaft 76 disposed therebetween. The power is transmitted to the fourth gear 79 via the gear 77. With such a configuration, as the drive motor rotates forward or backward, the discharge drive roller 27, the feed drive roller 15, and the reverse drive roller 39 rotate forward or reverse. The driving gear 71, the second gear 75, the third gear 77, the fourth gear 79, and the rotating shaft 74 for transmitting the rotational driving force of the driving motor to the reversing driving roller 39 constitute a first driving transmission system. .

  On the other hand, a sun gear 81 meshes with the drive gear 71, and a rotation arm 83 including a first arm 82 and a second arm 84 extending in two directions rotates on the same rotation axis as the sun gear 81. It is movably provided. At each end of the first arm portion 82 and the second arm portion 84, a first planetary gear 85 and a second planetary gear 87 are provided in mesh with the sun gear 81, respectively.

  The first connection gear 89 and the second connection gear 91 are arranged in the vicinity of the sun gear 81 so as to mesh with each other. When the sun gear 81 rotates clockwise in FIG. When the first planetary gear 85 meshes with the first connection gear 89 by the clockwise rotation and the sun gear 81 rotates in the counterclockwise direction, the first arm 85 rotates in the counterclockwise direction by the rotation of the rotating arm 83. The two planet gears 87 mesh with the second connection gear 91. Note that the sun gear 81, the rotating arm 83, the first planetary gear 85, the second planetary gear 87, the first connection gear 89, and the second connection gear 91 constitute a planetary gear mechanism.

  The second connection gear 91 is provided on the rotation shaft 93 of the immediately preceding drive roller 45 via a train of fifth gear 95, sixth gear 97, seventh gear 99, eighth gear 101, and ninth gear 103. It is connected to the tenth gear 105. The sixth gear 97 is provided on the rotation shaft 98 of the intermediate drive roller 43.

  The angular positional relationship between the first arm portion 82 and the second arm portion 84 is determined from the state where the first planetary gear 85 meshes with the first connection gear 89 when the drive motor changes from forward rotation to reverse rotation. While the second planetary gear 87 meshes with the second connection gear 91, it is determined that sufficient time is given to cancel the skew state of the sheet by the reverse rotation of the feed drive roller 15. It should be noted that the time from the state where the first planetary gear 85 meshes with the first connection gear 89 to the state where the second planetary gear 87 meshes with the second connection gear 91 is defined as an idling period.

  A fourteenth gear 111 meshes with the first connection gear 89 via a twelfth gear 107 and a thirteenth gear 109. The fourteenth gear 111 is arranged behind the third gear 77 as shown in FIG. 3, and is fixed to the rotating shaft 76 on which the third gear 77 freely rotates. Since the drive roller 41 is fixed to the rotating shaft 76, the drive roller 41 rotates by the rotation of the first connection gear 89. The planetary gear mechanism, the twelfth gear 107, the thirteenth gear 109, the fourteenth gear 111, and the rotating shaft 76 for transmitting the drive to the pick-up drive roller 41 constitute a second drive transmission system.

  With such a drive transmission mechanism, when the drive motor rotates forward, the feed drive roller 15, the discharge drive roller 27, the inversion drive roller 39, the pickup drive roller 41, the intermediate drive roller 43, and the immediately preceding drive roller 45 rotate forward. When the drive motor rotates in the reverse direction, the feed drive roller 15, the discharge drive roller 27, and the reverse drive roller 39 rotate in the reverse direction, respectively, and the drive roller 41, the intermediate drive roller 43, and the immediately preceding drive roller 45 rotate in the forward direction. become.

  In the present invention, “forward rotation” of the various rollers means that the paper rotates in a direction in which the paper is sent forward along the first path 38 and the second path 40, and “reverse rotation” of the various rollers means , Which means that the paper is rotated so as to be conveyed in the opposite direction. Regarding the reversing drive roller 39 existing over the first path 38 and the second path 40, rotation in the direction in which the sheet is sent forward along the first path 38 is referred to as "forward rotation". Also, “forward rotation” of the drive motor refers to a state in which the feed drive roller 15 is rotationally driven so as to rotate forward, and if the drive motor is “reverse rotation”, the feed drive roller 15 rotates in the reverse direction. Refers to the state of rotational drive.

  Meanwhile, the rotating shafts 74, 76, 98, and 93 come in contact with a conductive wire 147 as shown in FIG. 18, and the conductive wire 147 is connected to a metal frame (not shown) as "ground means". As a result, static elimination of the rotating shafts 74, 76, 98, 93 formed by the metal shaft body is performed, so that a reduction in recording accuracy (ink landing accuracy) and other various problems are prevented.

  The conductive wire 147 extends vertically so as to connect the rotating shaft 74 at the end and the rotating shaft 93 as shown in the figure, and the end of the conductive wire 147 extends straight in the upper rotating shaft 74. The lower rotation shaft 93 is processed so as to be wound around the rotation shaft 93 by a fixed amount, so that errors in the length direction can be absorbed. 19, bent portions 147a, 147b, and 147a having a U-shape are formed in a substantially middle portion of the conductive wire 147 so as to meander on the same plane.

  On the other hand, as shown in FIG. 19, the frame 149 supporting the rotating shafts 74, 76, 98 and 93 is depressed in a direction perpendicular to the axial direction of each rotating shaft (the vertical direction in FIG. 19B). Holes 151, 151 are formed, and bent portions 147a, 147a are fitted into the holes 151, 151. Further, hooked portions 152, 152 are formed between the holes 151, 151, and as shown in FIG. 19B, a bent portion 147b projecting in a direction opposite to the bent portions 147a, 147a is formed. The hooks 152 are hooked on the hooks 152. Therefore, when the conductive wire 147 is attached, the bent portions 147a and 147a can be fitted into the holes 151 and 151, and then the bent portion 147b can be hooked on the hooked portions 152 and 152, so that the conductive wire 147 can be attached. Become. With such a mounting configuration, the conductive wire 147 is mounted so as to extend from the holes 151, 151 to the rotating shafts 74, 93, respectively.

  With the above configuration, the following operation and effect can be obtained. First, the dimensional tolerance of the conductive wire 147 is not determined by the distance between the rotating shaft 74 and the rotating shaft 93, but by the distance from the hole 151 to the rotating shaft 74 and from the hole 151 to the rotating shaft 93. Therefore, as a result of attaching the conductive wire 147, the length error (large excess, or conversely, large shortage) can be suppressed to be small, and the attachment workability is facilitated (the processing of both ends is easy). Become). Secondly, mounting can be performed by fitting the bent portion 147a into the hole 151 and hooking the bent portion 147b to the hooked portions 152, 152, so that the mounting workability can be improved by such a simple mounting means. It will be easier. It should be noted that a structure without the locked portion 152, that is, the bent portion 147 a can be attached only by fitting the bent portion 147 a into the hole 151. Also, at the time of removal, the conductive wire 147 can be removed only by removing the bent portion 147b from the locked portions 152, 152 and lifting it up, so that the work is easy not only at the time of attachment but also at the time of removal. In addition, since no space is required in the axial direction of the rotating shafts 76, 98, and 93 (the direction of the front and back in FIG. 19B), the mounting can be performed in a small space.

  Next, the pivoting member 57 pivots in the direction of the arrow 55 (see FIG. 1), and the contacting state (the state of FIG. 9) in which the welcome driven roller 59 abuts the welcome drive roller 41, and the arrow from the contact state. A mechanism for switching between a release state (a state shown in FIG. 1) in which the rotation member 57 rotates in a direction opposite to the direction 55 and the reception driven roller 59 separates from the reception drive roller 41 will be described with reference to FIGS. I do. FIG. 5 is a side view showing the periphery of the flap member and the flap drive cam in the release state, and FIG. 6 is a perspective view showing the relationship between the first planetary gear and the second planetary gear and the flap drive cam.

  As shown in FIG. 5, the rotating member 57 is formed at one end of a flap member 123 that can swing around the swing shaft 121, and the other end of the flap member 123 has a flat and long cam follower 125. Is formed. Further, one end of a torsion coil spring 127 is locked to the flap member 123 as urging means, and the flap member 123 is moved to the swing shaft 121 so that the driven roller 59 and the driven roller 41 come into contact with each other. Is always urged in the counterclockwise direction in FIG. The first path 38, the second path 40, the reversing drive roller 39, the receiving drive roller 41, the receiving driven roller 59, the rotating member 57, and the flap member 123 constitute a recording medium reversing mechanism or a jetting medium reversing mechanism. I do.

  On the other hand, a flap drive cam 129 is provided adjacent to the first planetary gear 85 and the second planetary gear 87. The flap drive cam 129 includes a flap operation gear 131 and a flap return gear 133 having substantially the same diameter, and the flap return gear 133 can rotate around the rotation shaft 134 integrally with the flap operation gear 131. is there.

  A tooth 135 is formed around the flap operating gear 131 over a length substantially equal to a quarter of the entire circumference, and no tooth is formed in other peripheral portions. The teeth 135 of the flap operation gear 131 are aligned with the positions of the teeth of the second connection gear 91 at positions where the second connection gear 91 meshes with the second planetary gear 87.

  Immediately inside the portion where the teeth 135 are formed, a flat cam action portion 137 having a first end 138 and a second end 140 is formed so as to protrude from the surface of the flap operation gear 131. In the release state shown in FIG. 5, the tooth portion 135 and the cam action portion 137 face the second planetary gear 87 side, and the flat cam follower 125 of the flap member 123 is parallel to the flat cam action portion 137. It is locked. Accordingly, the flap member 123 can maintain the release state against the urging force of the coil spring 127.

  As shown by the broken line in FIG. 5, the flap return gear 133 is formed with teeth 141 around the entire periphery except the missing tooth 139. As shown in FIG. 5, when the first planetary gear 85 rotates toward the flap return gear 133 in the release state, the missing tooth portion 139 of the flap return gear 133 is positioned around the position where the first planetary gear 85 is located. ing.

  As shown in FIG. 6, the first planetary gear 85 has a thickness capable of meshing with the first connection gear 89 and the tooth portion 141 of the flap return gear 133 at the same time. The thickness does not match. Further, the second planetary gear 87 can mesh with the second connection gear 91 and the teeth 135 of the flap operation gear 131 at the same time.

  Hereinafter, the operation of the present invention according to the present embodiment will be described. FIG. 7 is a side sectional view when the leading edge of the sheet before reversing is located at the feed drive roller, and FIG. 8 shows a state when the leading edge of the sheet is fed to the highest position to reverse the sheet. FIG. 9 is a side sectional view showing a state in which a rotating member is rotated to reverse the sheet, and FIG. 10 is a side section when the leading end of the reversed sheet is located in the sheet detecting device. FIG. FIGS. 11 to 13 are side views showing the operation of the flap operating gear when the receiving driven roller shifts from the release state in which the receiving driven roller is separated from the driving roller to the contact state in which the driven driven roller comes into contact with the driving roller. FIGS. 17A to 17A show the action of the flap operating gear 131 and the flap member 123 when shifting from the contact state to the release state, and FIGS. 14 to 17B show the operation from the contact state to the release state. FIG. 10 is a side view showing the state of the flap return gear 133 at the same timing as in FIG. FIG. 18 is a side view of the train wheel of the double-sided recording apparatus, FIGS. 19A and 19B are views showing the mounting structure of the conductive wire 147, FIG. 20 is a side sectional view of the flap drive cam, and FIG. (B) is a perspective view of the flap member 123, FIG. 22 is a side sectional view showing a main part of the double-sided recording apparatus, FIG. 23 is a perspective view showing a main part of the double-sided recording apparatus, and FIG. It is an enlarged side view.

  First, when a sheet is supplied from the feeding unit to the first path 38 via the sheet feeding path 7, the drive motor rotates in the forward direction, so that the drive gear 71 and the first drive gear 69 move in the directions shown by arrows in FIG. , And the discharge drive roller 27 rotates forward. Further, the feed drive roller 15 rotates forward through a gear train (not shown) which is always meshed with the first drive gear 69, and the reverse drive roller 39 also rotates through the second gear 75, the third gear 77 and the fourth gear 79. Rotate forward.

On the other hand, when the driving gear 71 rotates in the direction of the arrow, the sun gear 81 rotates clockwise in FIG. 2, and the rotating arm 83 rotates clockwise accordingly. As a result, the first planetary gear 85 meshes with the first connection gear 89. The rotational driving force of the first connection gear 89 causes the intermediate drive roller 43 to rotate forward through the second connection gear 91, the fifth gear 95, and the sixth gear 97, and further rotates the seventh gear 99, the eighth gear 101, The immediately preceding drive roller 45 is rotated forward in the direction indicated by the arrow via the ninth gear 103 and the tenth gear 105. At the same time, the rotational driving force of the first connection gear 89 causes the drive roller 41 to rotate forward through the twelfth gear 107, the thirteenth gear 109, and the fourteenth gear 111.
At this time, the pickup follower roller 59 is in a release state apart from the pickup drive roller 41, and the cam follower 125 of the flap member 123 is locked on the cam action portion 137 in a parallel state as shown in FIG.

  As shown in FIG. 7, when the leading end of the paper P reaches the feed roller 9, the paper P advances while receiving a precise paper feed operation to the printhead by the feed drive roller 15, and the first face of the paper P is printed by the printhead 23. Is recorded. When the leading edge of the sheet P reaches the discharge roller 13, the sheet P is ejected toward the points 31 and 33, and when the leading edge of the sheet P reaches the reversing drive roller 39, the sheet P moves in the direction of arrow 113 (see FIG. 8). As shown in FIG. 8, the trailing edge of the sheet P is sent out by a predetermined number of steps to the vicinity of the position indicated by the point 33.

  When the trailing edge of the sheet P is sent out to the vicinity of the position indicated by the point 33, the drive motor rotates in the reverse direction, and each roller is driven to rotate forward or reverse by the following drive transmission. That is, as shown in FIG. 4, the drive gear 71 rotates in the reverse direction due to the reverse rotation of the drive motor, so that all the gear trains always meshing with the drive gear 71 rotate in the reverse direction. The drive roller 15 and the reverse drive roller 39 rotate in the reverse direction. When the driving gear 71 rotates in the reverse direction, the sun gear 81 rotates in the counterclockwise direction in FIG. 4, and the rotating arm 83 rotates in the counterclockwise direction. 2 meshes with the connection gear 91. As a result, the rotation directions of the first connection gear 89 and the second connection gear 91 are the same as those when the drive motor is rotating forward, and therefore, as described above, the intermediate drive roller 43, the immediately preceding drive roller 45, and the pick-up drive roller 41 are rotated forward.

  When the second planetary gear 87 meshes with the second connection gear 91, it also meshes with the tooth portion 135 of the flap operating gear 131 at the same time, as shown in FIG. When the second planetary gear 87 rotates in this state, the flap operating gear 131 rotates together with the flap return gear 133 in the direction indicated by the arrow 143 in FIG. 5, and at this time, as shown in FIGS. A second end 140 of the working portion 137 supports the cam follower 125. Further, at this time, since the second planetary gear 87 meshes with the teeth 135 of the flap operation gear 131, it is possible to suppress a rapid rotation of the flap operation gear 131 due to the urging force of the torsion coil spring 127.

  As shown in FIG. 12, when the flap operation gear 131 rotates to a position where the tooth portion 135 is disengaged from the second planetary gear 87, the cam follower 125 pushes the second end 140 of the cam action portion 137 by the urging force of the torsion coil spring 127. Then, the flap operating gear 131 is rotated at a stroke to the position shown in FIG. As a result, the flap member 123 and the rotating member 57 swiftly swing counterclockwise in FIG. 13 around the swing shaft 121, and the contact driven roller 59 contacts the drive roller 41. By such a rotation operation of the rotation member 57, the rear end of the sheet P is forcibly turned to the drive roller 41 side. As a result, the sheet P is sandwiched between the welcome driven roller 59 and the welcome drive roller 41 protruding from the opening 63.

  Here, as described with reference to FIG. 12, when the flap operating gear 131 rotates to the position where the tooth portion 135 is disengaged from the second planetary gear 87, the cam follower 125 is moved by the biasing force of the torsion coil spring 127. When the second end 140 is pushed in, the flap operating gear 131 is rotated at a stroke to the position shown in FIG. 13, but at this time, that is, when the swinging operation of the flap member 123 stops, the configuration of the flap member 123 and its surroundings There is a possibility that a collision sound with the element is generated. In order to prevent such a problem, even if a braking force is generated by the drive motor, the flap operating gear 131 causes the second planetary gear 87 to move when the state shown in FIG. 12 changes to the state shown in FIG. Since the second planetary gear 87 is rotated in a vigorous direction in the separating direction (the second planetary gear 87 is clockwise in FIG. 12), the swing speed of the flap member 123 cannot be reduced as a result.

  Therefore, by separately providing a brake means as shown in FIG. 20, it is possible to suppress the generation of a collision sound. 20, the flap return gear 133 and the flap operation gear 131 are attached via a flat seat 157 by a set screw 155 so as not to drop off from the rotating shaft 134. However, the flap return gear 133 and the flap return gear 133 are connected via a flat seat 159. A pressing spring 159 is provided as “braking means” for urging the flap operating gear 131 toward the flat seat 157. Since the pressing spring 159 presses the flap return gear 133 and the flap operating gear 131 in the rotation axis direction, a frictional force (mainly, a frictional force between the flat seat 157) is generated when the flap return gear 133 and the flap operating gear 131 rotate. ) Occurs, and the rotation speed is reduced. Accordingly, it is possible to suppress the collision sound when the swing operation of the flap member 123 stops, that is, when the welcome driven roller 59 comes into contact with the welcome drive roller 41.

  The flap member 123 having a shape extending in the paper width direction as shown in FIG. 21 has the flap drive cam 129 and the torsion coil spring 127 at one end in the longitudinal direction, and the torsion coil spring 127 at the other end. The flap member 123 tends to twist. Thereby, in the plurality of welcome driven rollers 59 provided in the width direction, some of the welcome driven rollers 59 can be in contact with the welcome drive roller 41, but the other welcome driven rollers 59 are in contact with the welcome drive roller 41. There is a possibility that a state where the contact state is not achieved, that is, an uneven state may occur. The rotating member 57 functions to guide the sheet obliquely upward when the pickup driven roller 59 is separated from the pickup drive roller 41. However, if the posture with respect to the sheet is not uniform in the sheet width direction, for example, the sheet There is also a possibility that the leading end abuts on the rotating member 57 to cause paper jam. Therefore, as shown in FIG. 21 (B), a plate 161 as a “rigid body” formed of a metal plate material so as to have a substantially L-shaped cross section is provided, thereby suppressing the twisting tendency. It is composed. In addition to this, since the rigidity of the flap member 123 is increased, the above-described operation and effect of reducing the collision sound is also achieved.

  Subsequently, returning to FIG. 8, the sheet P conveyed to the position shown in FIG. 8 is guided to the second path 40 by the reversing drive roller 39 and the pick-up drive roller 41 rotating counterclockwise in FIG. 9, respectively. In the middle, a driving force in the direction of the point 37 is applied by the intermediate driving roller 43. Thereafter, as shown in FIG. 10, the inverted sheet P is transported toward the feed drive roller 15 by the immediately preceding drive roller 45.

  When moving from the first path 38 to the second path 40, the traveling direction of the sheet is opposite, so that the leading and trailing ends of the sheet passing through the first path 38 And the leading edge and the trailing edge of the sheet P passing therethrough. Further, the upper surface (printing surface) of the paper P when passing through the first path 38, that is, the first surface, becomes the lower surface when reaching the recording head 23 via the second path 40, and passes through the first path 38. The lower surface of the sheet P, that is, the second surface, becomes the upper surface (printing surface) when reaching the recording head 23 via the second path 40.

  When the leading end of the sheet P that has passed through the second path 40 is detected by the sheet detection device 65, the drive motor that has been rotating in the reverse direction is switched to the forward rotation, and the feed drive roller 15 rotates forward. When the leading edge of the sheet P reaches between the feed driving roller 15 and the feed driven roller 17 and is conveyed until the leading edge of the sheet is nipped by about 3 mm, the driving motor starts to rotate again in the reverse direction.

  At this time, from the state where the first planetary gear 85 meshes with the first connection gear 89 (see FIG. 2) to the state where the second planetary gear 87 meshes with the second connection gear 91 (see FIG. 4). , Causing an idle period. During this idle period, since the drive is not transmitted to the immediately preceding drive roller 45, the inverted sheet is fixed between the immediately preceding drive roller 45 and the immediately preceding driven roller 51 while being nipped.

  On the other hand, since the driving force is transmitted to the feed drive roller 15 immediately after the drive motor turns to the reverse rotation, the feed drive roller 15 rotates in the reverse direction. Therefore, during the idle period, the leading end of the inverted sheet P is sent backward with the rear side fixed, so that the sheet P is bent upward and the sheet P is conveyed in a skew state. Even if it does, the leading end of the paper P is aligned straight between the feed driving roller 15 and the feed driven roller 17, and the skew state is eliminated.

  When the above-described series of operations is completed, the drive motor starts to rotate forward again, and the recording head 23 records the paper P on the second surface by the precise rotation of the feed drive roller 15 to the recording head. Done. Thereafter, the sheet on which recording has been completed is discharged by the action of the discharge roller 13.

  As shown in FIG. 14B, the first planetary gear 85 meshes with the flap return gear 133 and the first connection gear 89 as the drive motor continues to rotate forward in this manner. As a result, the flap return gear 133 starts to rotate in the direction of the arrow 145, and as shown in FIG. 15A, the cam action portion 137 of the flap operation gear 131 twists the cam follower 125 against the urging force of the coil spring 127. Start pushing.

  When the flap operation gear 131 rotates to the position shown in FIG. 16A and then rotates slightly further, the first planetary gear 85 meshes with the flap return gear 133 (in FIG. 16B). 17), the first planetary gear 85 is brought into a state of facing the toothless portion 139 (a state shown in FIG. 17B). As a result, the flap return gear 133 and the flap operation gear 131 can freely rotate, so that the cam follower 125 pushes the second end 140 of the cam action portion 137 from the state shown in FIG. ), The cam follower 125 is supported on the cam action portion 137 in parallel.

  By such a series of operations, the flap member 123 swings clockwise around the swing shaft 121, and as a result, the pickup driven roller 59 returns to the release state in which it is separated from the pickup drive roller 41 again.

  Incidentally, the above-described reversing section 5 is provided detachably with respect to an ink jet type double-sided recording apparatus provided with the reversing section. This takes into account, for example, the paper removal operation when a paper jam occurs in the reversing unit 5, and as shown by the imaginary line and reference numeral 163 ′ in FIG. The sheet conveying path in the reversing section 5 can be exposed by being provided so as to be swingable about the rotation axis of the driven roller 46, that is, by opening the guide member 163.

  However, if the guide member 163 is opened when the user carries the reversing unit 5, the guide member 163 may be damaged, which is not preferable. Therefore, a projection 167 is provided on the guide member 163 as shown in FIG. 23, and a locked portion 173 that engages with the projection 167 is formed on a frame 149 that forms the base of the reversing portion 5.

  As shown in FIG. 24, the relationship between the projection 167 and the locked portion 173 is such that the projection 167 enters the concave portion 174 when the guide member 163 is mounted, and the locked portion 173 causes the guide member 163 to open in the opening direction. Is regulated. That is, the guide member 163 does not open naturally when no external force is applied. When the guide member 163 swings in the opening direction by a user's operation from this state, the projection 167 rides over the locked portion 173 as shown by the solid line in FIG. As a result, the guide member 163 is opened. As described above, the guide member 163 does not open when the user carries the reversing unit 5, and safety is improved.

  Incidentally, there is a case where the reversing unit 4 is mounted on the ink jet type double-sided recording apparatus with the guide member 163 kept open, that is, with the projection 167 being disengaged from the concave section 174 in FIG. A leaf spring as shown by an imaginary line and reference numeral 169 in FIG. 23 is provided, while a rib 165 capable of engaging with the leaf spring 169 is formed on the guide member 163. Therefore, even if the reversing unit 5 is mounted on the apparatus main body with the guide member 163 being open, the leaf spring 169 presses the rib 165, so that the guide member 163 is closed. , Which ensures safety.

FIG. 1 is a side sectional view showing a main part of a double-sided recording apparatus to which the present invention is applied. FIG. 4 is a side view of the wheel train when the discharge drive roller is rotating forward. The perspective view which shows the structure around 3rd gear and 14th gear. FIG. 5 is a side view of the wheel train showing a state when the discharge drive roller is inverted. The side view which shows the flap member of a release state, and the periphery of a flap drive cam. FIG. 4 is a perspective view showing a relationship between first and second planetary gears and a flap drive cam. FIG. 4 is a side cross-sectional view when the leading end of the sheet before reversing is positioned at a feed driving roller. FIG. 4 is a side cross-sectional view illustrating a state in which the leading edge of a sheet is sent to the highest position. FIG. 4 is a side cross-sectional view illustrating a state in which a rotating member is rotated to reverse the sheet. FIG. 4 is a side cross-sectional view when the leading end of the inverted sheet is located at the sheet detection device. The figure which shows the effect | action of the flap operation gear at the time of shifting from a release state to a contact state. The figure which shows the effect | action of the flap operation gear at the time of shifting from a release state to a contact state. The figure which shows the effect | action of the flap operation gear at the time of shifting from a release state to a contact state. The figure which shows the effect | action of the flap operation gear at the time of shifting from a contact state to a release state. The figure which shows the effect | action of the flap operation gear at the time of shifting from a contact state to a release state. The figure which shows the effect | action of the flap operation gear at the time of shifting from a contact state to a release state. The figure which shows the effect | action of the flap operation gear at the time of shifting from a contact state to a release state. FIG. 2 is a side view of a train wheel of the double-sided recording device. The figure which shows the attachment structure of a conductive wire. FIG. 4 is a side sectional view of a flap drive cam. The perspective view of a flap member. FIG. 2 is a side sectional view showing a main part of the double-sided recording apparatus. FIG. 2 is a perspective view illustrating a main part of the double-sided recording apparatus. FIG. 2 is a partially enlarged side view of the duplex recording apparatus.

Explanation of reference numerals

  1 main unit, 3 recording unit, 5 reversing unit, 7 paper feeding path, 9 feed roller, 11 carriage, 13 discharge roller, 15 feed drive roller, 17 feed driven roller, 19 torsion coil spring, 21 roller urging member, 23 recording head, 25 platen, 27 discharge drive roller, 29 discharge jagged roller, 31, 33, 35, 37 points, 38 first path, 39 reverse drive roller, 40 second path, 41 pickup drive roller, 43 intermediate drive roller, 45 immediately preceding drive roller, 46 paper guide driven roller, 47 reverse driven roller, 49 intermediate driven roller, 51 immediately preceding driven roller, 55 arrow, 57 rotating member, 59 receiving driven roller, 61 guide member, 63 opening, 65 paper detection Device, 67 rotating shaft of discharge drive roller, 69 first gear, 70 control device, 71 drive Gears, 73 Rotary shaft of drive gear, 74 Rotary shaft of reverse drive roller, 75 Second gear, 76 Rotary shaft, 77 Third gear, 79 Fourth gear, 81 Sun gear, 82 First arm, 83 Rotating arm , 84 second arm part, 85 first planetary gear, 87 second planetary gear, 89 first connection gear, 91 second connection gear, 93 rotary shaft of the immediately preceding drive gear, 95 fifth gear, 97 sixth gear, 98 Rotating shaft of the intermediate drive roller, 99 seventh gear, 101 eighth gear, 103 ninth gear, 105 tenth gear, 107 twelfth gear, 109 th thirteenth gear, 111 th 14th gear, 113 arrow, 115 paper deflection, 121 swing shaft, 123 flap member, 125 cam follower, 127 torsion coil spring, 129 flap drive cam, 131 flap operation gear, 133 flap return A, 134 rotating shaft, 135 tooth portion, 137 cam action portion, 138 first end of cam action portion, 139 missing tooth portion, 140 second end of cam action portion, 141 tooth portion, 143 arrow, 145 arrow, 147 Conductive wire, 149 frame, 151 hole, 152 hook, 153 biasing spring, 155 set screw, 157 flat seat, 159 flat seat, 161 plate, 163 paper guide member, 165 rib, 167 locking projection, 168 support Part, 169 leaf spring, 173 locked part, 174 concave part, P paper

Claims (9)

A recording unit, a rotary drive source capable of switching between forward and reverse rotation, and a recording unit for reversing the recording medium after recording on the first surface of the recording medium by the recording unit and recording the recording medium on the second surface. A double-sided recording apparatus including a recording medium reversing mechanism for guiding a recording medium to the recording unit again,
The recording medium reversing mechanism,
1) a first path for defining the traveling direction of the recording medium when recording on the recording medium;
2) a second path for guiding the recording medium in the reverse direction so that the trailing end of the recording medium in the first path is the front end;
3) a reversing drive roller rotatable in both forward and reverse directions to switch the recording medium from a traveling direction on a first path to a traveling direction on a second path;
4) a pickup drive roller provided downstream of the reversing drive roller in the second path;
5) Rotation between a first position at which the recording medium can be guided to the first path and a second position at which the rear end of the recording medium after the conveyance of the first path is directed toward the second path. A rotating member having a pickup driven roller that can contact the pickup drive roller on the lower end side,
6) The rotating member is provided at one end, a cam follower is formed at the other end, and a swing shaft is provided between the one end and the other end, and the pickup driven roller contacts the pickup drive roller. A flap member provided with a biasing means for biasing to swing in a contacting direction,
The double-sided recording device,
1) a first drive transmission system for transmitting the drive force of the rotary drive source to the reversing drive roller via a train of gears that are always meshed with each other;
2) branching from the first drive transmission system, and transmitting the driving force of the rotary drive source via the planetary gear mechanism so that the contact drive roller rotates forward regardless of the rotary drive direction of the rotary drive source. A second drive transmission system for transmitting to the drive roller;
3) The swing of the flap member around the swing shaft is controlled by the driving force of the rotary drive source transmitted to the second drive transmission system, so that the welcome driven roller contacts the welcome drive roller. A flap drive cam that switches between a contact state in which it comes into contact and a release state in which the welcome driven roller separates from the welcome drive roller,
The planetary gear mechanism includes a sun gear, a rotating arm having a first arm portion and a second arm portion extending in two directions that rotate around the same rotation axis as the sun gear, and provided at a tip of each of the arm portions. A first planetary gear and a second planetary gear that mesh with the sun gear, and a first connection gear and a second planetary gear that the first planetary gear and the second planetary gear mesh with each other according to the rotation direction of the sun gear. And two connecting gears,
The flap drive cam,
A flap operation having a cam portion that is formed on a part of the outer periphery and protrudes from a surface located inside the tooth portion and that can support the cam follower. Gear and
A flap return gear that rotates integrally with the flap operating gear and has a tooth portion that meshes with the first planetary gear and the second planetary gear around all but the missing tooth portion;
The tooth portion of the flap operating gear is formed at a position where the second planetary gear meshes with the second planetary gear when the second planetary gear rotates toward the flap operating gear in the release state.
The recording medium, wherein the tooth portion of the flap return gear is formed around the position where the first planetary gear is located when the first planetary gear rotates toward the flap return gear in the release state. Transfer path changing device. 2. The cam follower according to claim 1, wherein the cam follower and the cam acting portion are formed flat, and in the release state, the cam follower is supported by the cam acting portion in a state parallel to the cam acting portion. A transport path changing device for a recording medium. The brake device according to claim 1 or 2, further comprising a brake unit configured to reduce a speed at which the flap member swings in a direction in which the welcome driven roller comes into contact with the welcome drive roller.
An apparatus for changing a transport route of a recording medium, comprising: The brake device according to claim 3, wherein the brake unit is configured by a pressing spring that urges the flap operating gear in a rotation axis direction of the flap operating gear.
An apparatus for changing a transport route of a recording medium, comprising: 5. The flap member according to claim 1, wherein the flap member has a shape extending in a width direction of the recording medium, and the cam follower and the biasing unit are provided at one end in the width direction. The biasing means is provided on the side, and a rigid body extending in the width direction of the recording medium is provided.
An apparatus for changing a transport route of a recording medium, comprising: The recording medium according to any one of claims 1 to 5, wherein the recording medium is arranged downstream of the contact drive roller in a transport path of the recording medium when recording is performed on the second surface of the recording medium. A transport roller for second face recording that is transported and driven to rotate,
A conductive wire electrically connected to a rotating shaft of a roller group including the reversing drive roller, the pickup drive roller, and the second surface recording conveyance roller, and connected to a grounding means,
A bent portion is formed in a part of the conductive wire, and the bent portion is inserted into a hole provided in a part of the transport path changing device, so that the conductive wire is removed from the hole. It is attached to extend to the roller group,
An apparatus for changing a transport route of a recording medium, comprising: A recording unit, a rotary drive source capable of switching between forward and reverse rotation, and a recording unit for reversing the recording medium after recording on the first surface of the recording medium by the recording unit and recording the recording medium on the second surface. A double-sided recording apparatus including a recording medium reversing mechanism for guiding a recording medium to the recording unit again,
The recording medium reversing mechanism,
1) a first path for defining the traveling direction of the recording medium when recording on the recording medium;
2) a second path for guiding the recording medium in the reverse direction so that the trailing end of the recording medium in the first path is the front end;
3) a reversing drive roller rotatable in both forward and reverse directions to switch the recording medium from a traveling direction on a first path to a traveling direction on a second path;
4) a pickup drive roller provided downstream of the reversing drive roller in the second path;
5) Rotation between a first position at which the recording medium can be guided to the first path and a second position at which the rear end of the recording medium after the conveyance of the first path is directed toward the second path. A rotating member having a pickup driven roller that can contact the pickup drive roller on the lower end side,
6) The rotating member is provided at one end, a cam follower is formed at the other end, and a swing shaft is provided between the one end and the other end, and the pickup driven roller contacts the pickup drive roller. A flap member provided with a biasing means for biasing to swing in a contacting direction,
The double-sided recording device,
1) a first drive transmission system for transmitting the drive force of the rotary drive source to the reversing drive roller via a train of gears that are always meshed with each other;
2) branching from the first drive transmission system, and transmitting the driving force of the rotary drive source via the planetary gear mechanism so that the contact drive roller rotates forward regardless of the rotary drive direction of the rotary drive source. A second drive transmission system for transmitting to the drive roller;
3) The swing of the flap member around the swing shaft is controlled by the driving force of the rotary drive source transmitted to the second drive transmission system, so that the welcome driven roller contacts the welcome drive roller. A flap drive cam that switches between a contact state in which it comes into contact and a release state in which the welcome driven roller separates from the welcome drive roller,
The planetary gear mechanism includes a sun gear, a rotating arm having a first arm portion and a second arm portion extending in two directions that rotate around the same rotation axis as the sun gear, and provided at a tip of each of the arm portions. A first planetary gear and a second planetary gear that mesh with the sun gear, and a first connection gear and a second planetary gear that the first planetary gear and the second planetary gear mesh with each other according to the rotation direction of the sun gear. And two connecting gears,
The flap drive cam can selectively transmit drive from the first planetary gear and the second planetary gear, and the flap drive cam is configured such that when the drive is transmitted from the second planetary gear, the flap member is It operates so as to shift to the contact state by the urging force of the urging means, and when the drive is transmitted from the first planetary gear, the flap member shifts to the release state against the urging force of the urging means. A recording medium transport path changing device, which operates as follows. A recording apparatus comprising the apparatus for changing a conveyance path of a recording medium according to claim 1. An injection unit, a rotary drive source capable of switching between forward and reverse rotations, and for injecting the medium to be ejected onto the first surface of the medium to be ejected after the ejection by the ejection unit and ejecting the medium to the second surface. A double-sided liquid ejecting apparatus including an ejected medium reversing mechanism for guiding the ejected medium to the ejecting section again,
The injection medium reversing mechanism,
1) a first path that defines the traveling direction of the medium to be ejected when the medium is ejected;
2) a second path that guides the traveling direction of the medium to be ejected in the reverse direction so that the rear end of the medium to be ejected in the first path is the front end;
3) a reversing drive roller rotatable in both forward and reverse directions to switch the medium to be ejected from the traveling direction on the first path to the traveling direction on the second path;
4) a pickup drive roller provided downstream of the reversing drive roller in the second path;
5) Rotation between a first position at which the medium to be ejected can be guided to the first path and a second position at which the rear end of the medium to be ejected after the conveyance of the first path is directed toward the second path. A rotating member having a pickup driven roller that can contact the pickup drive roller on the lower end side,
6) The rotating member is provided at one end, a cam follower is formed at the other end, and a swing shaft is provided between the one end and the other end, and the pickup driven roller contacts the pickup drive roller. A flap member provided with a biasing means for biasing to swing in a contacting direction,
The double-sided liquid ejecting apparatus,
1) a first drive transmission system for transmitting the drive force of the rotary drive source to the reversing drive roller via a train of gears that are always meshed with each other;
2) branching from the first drive transmission system, and transmitting the driving force of the rotary drive source via the planetary gear mechanism so that the contact drive roller rotates forward regardless of the rotary drive direction of the rotary drive source. A second drive transmission system for transmitting to the drive roller;
3) The swing of the flap member around the swing shaft is controlled by the driving force of the rotary drive source transmitted to the second drive transmission system, so that the welcome driven roller contacts the welcome drive roller. A flap drive cam that switches between a contact state in which it comes into contact and a release state in which the welcome driven roller separates from the welcome drive roller,
The planetary gear mechanism includes a sun gear, a rotating arm having a first arm portion and a second arm portion extending in two directions that rotate around the same rotation axis as the sun gear, and provided at a tip of each of the arm portions. A first planetary gear and a second planetary gear that mesh with the sun gear, and a first connection gear and a second planetary gear that the first planetary gear and the second planetary gear mesh with each other according to the rotation direction of the sun gear. And two connecting gears,
The flap drive cam,
A flap operation having a cam portion that is formed on a part of the outer periphery and protrudes from a surface located inside the tooth portion and that can support the cam follower. Gear and
A flap return gear that rotates integrally with the flap operating gear and has a tooth portion that meshes with the first planetary gear and the second planetary gear around all but the missing tooth portion;
The tooth portion of the flap operation gear is formed at a position where the second planetary gear meshes with the second planetary gear when the second planetary gear rotates toward the flap operation gear in the release state.
The medium to be ejected, wherein the tooth portion of the flap return gear is formed around the position where the first planetary gear is located when the first planetary gear rotates toward the flap return gear in the release state. Transfer path changing device.

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