JP2009274784A - Recording material conveying apparatus and electronic device therewith - Google Patents

Abstract

In an electronic apparatus including a recording material conveyance device having a first conveyance device on the upstream side in the conveyance direction and a second conveyance device on the downstream side with respect to the recording material support surface, the conveyance direction of the recording material The possibility that the recording accuracy or the reading accuracy is lowered when the rear end of the rear end is separated from the first conveying device is reduced.
Immediately before the trailing end of the recording paper P in the transport direction is released from the contact point between the transport drive roller 51 and the transport driven roller 52, the transport drive roller 51 is displaced in the direction indicated by reference numeral B1. After the transport driving roller 51 is displaced, the top surface S1 of the platen rib 531, the tangent S2 at the apex of the outer peripheral surface of the transport driving roller 51, and the tangent at the contact point between the outer peripheral surface of the transport driving roller 51 and the outer peripheral surface of the transport driven roller 52. All of S3 are substantially in agreement.
[Selection] Figure 10

Description

  The present invention includes a recording material support surface that supports a recording material, a first transport device that is disposed upstream of the recording material support surface in the transport direction, and a downstream side of the recording material support surface in the transport direction. The present invention relates to a recording material conveyance device including a second conveyance device disposed in the electronic apparatus, and an electronic apparatus including the recording material conveyance device.

  An electronic apparatus provided with a recording material conveying device for conveying a recording material is known. For example, a recording device such as an ink jet printer provided with means for recording characters, images, etc. on the recording surface of the recording material conveyed by the recording material conveyance device, and recording performed by the recording material conveyance device A facsimile, a copier, a scanner device, and the like provided with means for reading characters and images recorded on the recording surface of the recording material. In such a recording material transport device mounted on such an electronic apparatus, a recording material support surface (a platen or the like) that supports the recording material, and a first material disposed upstream of the recording material support surface in the transport direction. 2. Description of the Related Art A recording material conveyance device including a single conveyance device and a second conveyance device disposed downstream of the recording material support surface in the conveyance direction is known.

  In the recording material transport apparatus as described above, characters, images, etc. are recorded on the recording surface of the recording material on the recording material support surface, or recorded on the recording surface of the recording material that has been recorded. Characters and images are read. In addition, the first transport device and the second transport device include, for example, a transport drive roller that rotates when a rotational driving force is transmitted, and a transport driven roller that is urged toward the outer peripheral surface of the transport drive roller and supported rotatably. Generally, a pair of conveying rollers is used. The recording material is sandwiched between the conveyance driving roller and the conveyance driven roller, and conveyed in the conveyance direction while being supported on the recording material support surface by the rotation of the conveyance driving roller.

  Here, the recording material such as recording paper may be warped or deformed due to various factors before or during recording. When the recording material in a state where warpage or deformation has occurred, the recording material may be lifted from the recording material support surface due to the warpage or deformation when the recording material is conveyed by the recording material conveyance device. The floating of the recording material with respect to the recording material support surface causes a decrease in recording accuracy in a recording apparatus such as an inkjet printer, and causes a decrease in reading accuracy in a facsimile, a copying machine, a scanner device, or the like.

As an example of the prior art that can solve such a problem, for example, the vertical interval between the apex of the recording material support surface and the apex of the outer peripheral surface of the conveyance drive roller is set to a predetermined interval, and the recording material A recording material conveying apparatus is known in which the angle of the tangent at the contact point between the outer peripheral surface of the transport driving roller and the outer peripheral surface of the transport driven roller with respect to the support surface is set to a predetermined angle. Due to the relative positional relationship of each component, the recording material sandwiched between the transport driving roller and the transport driven roller is transported while being pressed against the recording material support surface and in sliding contact therewith. As a result, a force that corrects warpage, deformation, or the like so as to follow the recording material support surface acts on the recording material, so that the recording material is supported from the recording material support surface due to warpage or deformation of the recording material. Is prevented from floating (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2002-19204

  In the above prior art, after the trailing edge of the recording material is released from the nipping by the conveying roller pair of the first conveying device, the recording material is continuously conveyed in the conveying direction only by the second conveying device. Become. At this time, when the trailing edge of the recording material is released from the nipping by the conveying roller pair of the first conveying device, the pressing force against the recording material support surface (the pressing force by the first conveying device) is the trailing edge of the recording material. It will not work on the side. For this reason, there may occur a phenomenon that the rear side of the recording material is lifted from the recording material support surface immediately after the trailing edge of the recording material is released from the nipping by the conveying roller pair of the first conveying device.

  This phenomenon is caused by the fact that the vertical distance between the apex of the recording material support surface and the apex of the outer peripheral surface of the transport drive roller is separated by a predetermined distance and is not on the same line. That is, after the rear end of the recording material is released from the nipping by the transport driving roller and the transport driven roller, the rear end of the recording material is in contact with the outer peripheral surface of the transport driving roller. Is lifted to the outer peripheral surface of the transport driving roller, and the rear side of the recording material is lifted from the recording material support surface.

  As described above, the lifting of the recording material from the recording material support surface causes a decrease in recording accuracy in a recording apparatus such as an ink jet printer, and causes a decrease in reading accuracy in a facsimile, a copying machine, a scanner device, or the like. It becomes. That is, in these electronic apparatuses equipped with a conventional recording material transport device, the recording accuracy or reading accuracy temporarily decreases immediately after the rear end of the recording material in the transport direction is detached from the first transport device. There was a problem that it would end up.

  The present invention has been made in view of such a situation, and the problem is that the first transport device is provided upstream in the transport direction across the recording material support surface, and the second transport device is provided downstream. In an electronic apparatus equipped with a recording material transport device, it is intended to reduce the possibility that the recording accuracy or the reading accuracy is lowered when the rear end of the recording material in the transport direction is separated from the first transport device.

  In order to achieve the above object, a first aspect of the present invention includes a recording material support surface that supports a recording material, and a first transport device disposed upstream of the recording material support surface in the transport direction. And a second transport device disposed downstream of the recording material support surface in the transport direction, and the first transport device includes a transport driving roller that is rotated by a rotational driving force transmitted thereto, A conveyance driven roller that is urged toward the outer peripheral surface of the conveyance drive roller and is rotatably supported, and a vertical distance between the vertex of the recording material support surface and the vertex of the outer peripheral surface of the conveyance drive roller A recording material in which α is set at a predetermined interval, and a tangential angle β at a contact point between the outer peripheral surface of the transport driving roller and the outer peripheral surface of the transport driven roller with respect to the recording material support surface is set to a predetermined angle. In the transfer device, it can be rotated by transmitting the rotational driving force. A recording material conveying apparatus comprising: a conveying driving roller supporting device that supports the conveying driving roller so that the distance α can be displaced in a direction in which the interval α is narrower than the predetermined interval while maintaining a stable state. .

  In this way, the transport driving roller is supported so as to be displaceable in a direction in which the interval α is narrower than the predetermined interval while maintaining a rotatable state by transmitting the rotational driving force. That is, the first transport device can transport the recording material in the transport direction while holding the recording material between the transport drive roller and the transport driven roller even after the transport drive roller is displaced. Therefore, even if the transport driving roller is displaced in a direction in which the interval α becomes narrower than the predetermined interval before the rear end of the recording material in the transport direction is released from the nipping by the transport driving roller and the transport driven roller, the first transport is performed. The state in which the recording material can be conveyed with high accuracy by the apparatus and the second conveying apparatus can be maintained.

  Then, from the state in which the recording material is conveyed by the first conveying device and the second conveying device, the rear end of the recording material in the conveying direction at the latest is the first conveying device (clamped by the conveyance driving roller and the conveyance driven roller). Before leaving, the transport driving roller is displaced in a direction in which the interval α is narrower than the predetermined interval. Accordingly, it is possible to reduce a possibility that the rear side of the recording material is lifted from the recording material support surface when the rear end of the recording material in the conveyance direction is separated from the first conveyance device.

  Thereby, according to the recording material transport apparatus according to the first aspect of the present invention, in the electronic apparatus including the recording material transport apparatus, the rear end of the recording material in the transport direction is separated from the first transport apparatus. There is an effect that the possibility that the recording accuracy or the reading accuracy is lowered when the recording head is separated can be reduced.

  According to a second aspect of the present invention, in the recording material conveyance device according to the first aspect described above, the conveyance drive roller support device is configured such that the interval α is smaller than the predetermined interval and the angle β is the angle β. The recording material conveying device is characterized in that the conveying driving roller is supported so as to be displaceable in a direction smaller than a predetermined angle.

  From the state in which the recording material is conveyed by the first conveying device and the second conveying device, the interval α becomes narrower than the predetermined interval at the latest before the rear end of the recording material in the conveying direction is separated from the first conveying device. The transport driving roller is displaced in the direction and the direction in which the angle β is smaller than the predetermined angle. Thereby, when the rear end of the recording material in the conveying direction is separated from the first conveying device, the possibility that the rear side of the recording material is lifted from the recording material support surface can be reduced. It is possible to further reduce the variation in the conveyance load at the time of separation by the amount by which the pressing force due to β decreases.

  Thereby, according to the recording material transport apparatus according to the second aspect of the present invention, in the electronic apparatus including the recording material transport apparatus, the rear end in the transport direction of the recording material is separated from the first transport apparatus. The effect of being able to further reduce the possibility that the recording accuracy or the reading accuracy is lowered when the recording head is separated is obtained.

  According to a third aspect of the present invention, in the recording material conveyance device according to the first aspect or the second aspect described above, the conveyance driven roller is supported to be displaceable following the displacement of the conveyance drive roller. The recording material conveying apparatus is characterized in that the recording material is conveyed.

  In this way, the conveyance driven roller is supported so as to be able to displace following the displacement of the conveyance drive roller, so that a predetermined clamping pressure is maintained and the conveyance drive roller and the conveyance driven after the conveyance drive roller is displaced. The recording material can be sandwiched and conveyed by the roller. Thereby, it is possible to reduce the possibility that the conveyance accuracy is lowered in a state where the conveyance drive roller is displaced.

  According to a fourth aspect of the present invention, in the recording material conveying apparatus according to any one of the first to third aspects described above, a mechanism for separating the conveying driven roller from the conveying driving roller is provided. Is a recording material conveying apparatus characterized by the above.

  Thus, by providing a mechanism for separating the transport driven roller from the transport drive roller, the transport driven roller can be temporarily separated from the transport drive roller. For example, the conveyance driving roller can be displaced after the rotation of the conveyance driving roller is stopped and the conveyance driven roller is separated from the conveyance driving roller. Then, after the transport drive roller is displaced, the transport driven roller is again brought into contact with the transport drive roller, and the transport of the recording material by the rotation of the transport drive roller can be resumed. By displacing the transport driving roller in this way, it is possible to reduce the possibility that a recording material transport error will occur due to the displacement of the transport driving roller. Further, when the trailing end of the recording material in the conveyance direction is separated from the first conveyance device, if the conveyance driven roller is separated from the conveyance driving roller, the fluctuation in the conveyance load at the time of the separation is further reduced. Can be made.

According to a fifth aspect of the present invention, in the recording material transport apparatus according to any one of the first to fourth aspects described above, a means for detecting a transport position of the recording material and a transport position of the recording material are provided. And a control device for controlling the transport driving roller support device based on the recording material transport device.
As described above, by controlling the transport driving roller support device based on the transport position of the recording material, the transport driving roller can be displaced at an appropriate timing according to the size of the recording material.

  According to a sixth aspect of the present invention, in the recording material transport apparatus according to the fifth aspect described above, the control device is configured such that the rear end of the recording material in the transport direction is the outer peripheral surface of the transport driving roller and the The recording material conveying apparatus according to claim 1, wherein the conveying driving roller is displaced immediately before the conveying driven roller is released from the contact point with the outer peripheral surface of the conveying driven roller.

  By displacing the transport driving roller at such timing, the interval α and the rear end in the transport direction of the recording material are just before the separation from the contact point between the outer peripheral surface of the transport driving roller and the outer peripheral surface of the transport driven roller. The recording material can be conveyed in an ideal state in which the angle β is set to a predetermined interval and a predetermined angle. As a result, it is possible to further reduce the possibility of the recording material floating from the recording material support surface.

According to a seventh aspect of the present invention, there is provided a recording material transport apparatus according to any one of the first to sixth aspects described above, and means for executing recording on a recording material supported by the recording material support surface. Alternatively, the electronic apparatus includes: means for reading information recorded on the recording material supported by the recording material support surface.
According to the electronic device of the seventh aspect of the present invention, the recording is performed on the recording material supported by the recording material support surface or the recording material supported by the recording material support surface. In the electronic apparatus provided with the means for reading the stored information, the operational effects of the invention according to any one of the first to sixth aspects described above can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Schematic configuration of inkjet printer>
First, a schematic configuration of an inkjet printer 50 which is an example of an “electronic device” according to the present invention will be described with reference to FIG.
FIG. 1 is a side sectional view of the ink jet printer 50.

  The ink jet printer 50 includes an automatic feeding device 70 for feeding the recording paper P into the ink jet printer 50. The ink jet printer 50 includes a transport driving roller 51 and a transport driven roller 52 that transport the recording paper P as a “recording material” supported by the platen 53 in the transport direction Y. Further, the ink jet printer 50 includes a recording head 62 as means for performing recording by ejecting ink onto the recording surface of the recording paper P supported by the platen 53. Further, the ink jet printer 50 includes a discharge driving roller 54 and a discharge driven roller 55 for transporting the recording paper P after execution of recording in the transport direction Y and discharging it.

  The automatic feeding device 70 includes a hopper 71, an edge guide 72, a feeding roller 74, a feeding path 75, and a separation pad 76. The hopper 71 is swung toward the feeding roller 74 by a rocking mechanism (not shown) on which the recording paper P to be fed is placed and operates in conjunction with the rotation of the feeding roller 74. Thereby, the recording paper P placed on the hopper 71 can be pressed against the outer peripheral surface of the feeding roller 74. In addition, a pair of symmetrical edge guides 72 that are paired with each other are disposed in the hopper 71 so as to be slidable in the width direction X of the recording paper P (direction intersecting the transport direction Y).

  The feeding roller 74 is disposed integrally with the feeding roller shaft 741 and rotates when the feeding roller shaft 741 is rotated by the rotational force of a feeding motor (not shown). The recording paper P is fed toward the contact surface between the transport driving roller 51 and the transport driven roller 52 through the feed path 75 by the rotation of the feed roller 74. At this time, another recording sheet is separated from the recording sheet P to be fed by a known separation pad 76 to prevent double feeding.

  The transport driving roller 51 has a high friction coating on the surface, and rotates by receiving the rotational driving force of a transport motor (not shown). The transport driven roller 52 is rotatably supported and is urged against the outer peripheral surface of the transport drive roller 51 by a biasing means such as a spring (not shown). The recording paper P fed by the automatic feeding device 70 is sandwiched between the transport driving roller 51 and the transport driven roller 52, and moves on the platen 53 by a predetermined transport amount in the transport direction Y by the driving rotation of the transport driving roller 51. Be transported.

  The recording head 62 is disposed at the bottom of the carriage 61. A large number of ejection nozzles (not shown) for ejecting ink are disposed on the head surface of the recording head 62. The carriage 61 is reciprocally moved in the width direction X of the recording paper P while maintaining a state in which the head surface of the recording head 62 and the recording surface of the recording paper P on the platen 53 are substantially parallel to the carriage guide shaft 56. It is supported. The carriage 61 is an endless belt (not shown) hung between a driving pulley (not shown) and a driven pulley (not shown) disposed on a rotating shaft of a carriage driving motor (not shown). Are coupled to each other, and the rotational driving force of the carriage driving motor is transmitted through the endless belt to reciprocate in the width direction X.

  The platen 53 has a large number of platen ribs (not shown) formed along the conveyance direction Y of the recording paper P. The recording paper P conveyed on the platen 53 is supported from the back side at the top of the platen rib. In the area of the recording paper P supported by the platen 53, dots are formed on the recording surface by the recording head 62 and recording is performed. The distance between the head surface of the recording head 62 and the recording surface of the recording paper P is defined by the top of the platen rib.

  The recording paper P conveyed on the platen 53 is configured to eject dots from the head surface of the recording head 62 to the recording surface of the recording paper P while the carriage 61 reciprocates in the width direction X, Recording on the recording surface is executed by alternately repeating the operation of conveying the sheet in the conveying direction Y by a predetermined rotation amount by driving rotation of the driving roller 51. The recording paper P after ink ejection is sandwiched between the discharge driving roller 54 and the discharge driven roller 55, conveyed in the conveyance direction Y by the driving rotation of the discharge driving roller 54, and discharged. A series of these recording controls is executed by the recording control unit 100 having a known microcomputer control circuit.

<Configuration of “Recording Material Conveying Device” according to the Present Invention>
Next, the configuration of the recording material transport apparatus 1 according to the present invention will be described with reference to FIGS.

2 is a cross-sectional side view of a main part of the recording material transport apparatus 1 according to the present invention, FIG. 3 is a perspective view of the main part, FIG. 4 is a plan view of the main part, and FIGS. FIG. 6 is an enlarged perspective view of a part thereof.
The recording material conveyance device 1 according to the present invention includes a conveyance driving roller 51 and a conveyance driven roller 52 as a “first conveyance device”, and a discharge driving roller 54 (FIG. 1) and a discharge driven as a “second conveyance device”. A roller 55 (FIG. 1) and a platen 53 constituting a “recording material support surface” are provided. The platen 53 is provided with a plurality of platen ribs 531, and the top surface of the platen rib 531 serves as a support surface for the recording paper P. The transport driving roller 51 and the transport driven roller 52 are disposed upstream of the platen 53 in the transport direction Y (FIGS. 1 to 3). The transport driven roller 52 is supported by a driven roller holder 532 while being rotatably supported by a driven roller shaft 521. Further, the discharge driving roller 54 and the discharge driven roller 55 are disposed downstream of the platen 53 in the transport direction Y (FIG. 1).

  The conveyance driving roller 51 and the discharge driving roller 54 are rotated by the rotation driving force of the conveyance motor 58 being transmitted. A driving gear 16 is fixed on one end side of the conveyance driving roller 51, and the first intermediate gear 17 and the second intermediate gear 18 are pivotally supported on a base body (not shown) of the inkjet printer 50. The first intermediate gear 17 has a large-diameter gear portion 171 and a small-diameter gear portion 172 that are integrally disposed concentrically. The first intermediate gear 17 has a small-diameter gear portion 172 meshed with the drive gear 16 so as to be able to transmit rotation, and a large-diameter gear portion 171 meshed with the second intermediate gear 18 so as to be able to transmit rotation. The second intermediate gear meshes with a drive pulley 581 provided on the rotation shaft of the conveyance motor 58 so as to be able to transmit the rotation.

  The rotational driving force of the conveying motor 58 is transmitted to the driving gear 16 via the second intermediate gear 18 and the first intermediate gear 17, whereby the conveying driving roller 51 rotates. Further, the rotation of the second intermediate gear 18 is transmitted to the discharge drive roller 54 via an endless belt (not shown).

  Here, the transport driving roller 51, the transport driven roller 52, and the platen rib 531 of the platen 53 are disposed so as to satisfy the following relative positional relationship (FIG. 2). First, the vertical interval α between the top surface S1 (recording material support surface) of the platen rib 531 and the tangent S2 at the apex of the outer peripheral surface of the transport driving roller 51 is set to a predetermined interval. Further, an angle β of a tangent S3 at a contact point between the outer peripheral surface of the transport driving roller 51 and the outer peripheral surface of the transport driven roller 52 with respect to the top surface S1 of the platen rib 531 is set to a predetermined angle.

  By providing the interval α and the angle β, the recording paper P conveyed by the rotation of the conveyance driving roller 51 while being sandwiched between the conveyance driving roller 51 and the conveyance driven roller 52 is the top surface of the platen rib 531. The sheet is conveyed in the conveyance direction Y while being slid and pressed against the sheet. As a result, the recording paper P is subjected to a force in a direction to correct warpage, deformation, or the like so as to follow the top surface of the platen rib 531. It is possible to prevent the recording paper P from floating from the top surface. The interval α and the angle β are appropriately determined according to the shape and size of each of the transport driving roller 51, the transport driven roller 52, and the platen 53, the size, type, and rigidity of the recording paper P to be used. The

  Then, the recording material conveying apparatus 1 according to the present invention is configured such that the conveyance driving roller is displaceable in a direction in which the interval α is narrower than a predetermined interval while maintaining the rotation state by transmitting the rotational driving force of the conveyance motor 58. A conveyance drive roller support device 10 for supporting 51 is provided. The transport drive roller support device 10 includes a support member 11, a right swing member 12, a left swing member 13, a swing shaft body 14, and a displacement motor 15.

  The support member 11 is a long plate member having both ends bent at substantially right angles as shown in the figure, and a support long hole 11a having the same shape is provided in the right end portion 111 and the left end portion 112, respectively. The transport drive roller 51 is pivotally supported by the support member 11 in a state in which the vicinity of both ends is inserted into the support long holes 11 a of the right end portion 111 and the left end portion 112. That is, the transport drive roller 51 is pivotally supported by the support member 11 in a state that it can be displaced along the shape of the support long hole 11a.

  The right swinging member 12 is provided with a long hole 121 on one end side in the longitudinal direction and a square hole 122 on the other end side. Similarly, the left swing member 13 is provided with a long hole 131 on one end side in the longitudinal direction and a square hole 132 on the other end side. The right rocking member 12 and the left rocking member 13 are integrated with the rocking shaft body 14 in a state where the rocking shaft body 14, which is a rectangular long rod-shaped member, is inserted into the square holes 122 and 132. It is arranged. The long hole 121 of the right swing member 12 is inserted through the right end of the transport driving roller 51, and the long hole 131 of the left swing member 13 is inserted through the left end of the transport driving roller 51.

  The swing shaft body 14 is attached to the rotation shaft of the displacement motor 15. The displacement motor 15 is rotationally controlled by the recording control unit 100.

<Operation of “Recording Material Conveying Device” according to the Present Invention>
Next, the operation of the recording material transport apparatus 1 according to the present invention will be described with reference to FIGS.

FIG. 7 is a side view schematically showing the main part of the recording material transport apparatus 1.
In the recording material transport apparatus 1, the drive pulley 581 of the transport motor 58 rotates in the direction indicated by the symbol C, whereby the second intermediate gear 18 rotates in the direction indicated by the symbol D, and the first intermediate gear 17 Rotates in the direction indicated by E, and the drive gear 16 rotates in the direction indicated by F. As a result, the rotational driving force of the transport motor 58 is transmitted to the transport drive roller 51, and the transport drive roller 51 rotates in the direction indicated by the symbol F.

  Further, in the conveyance drive roller support device 10, the right rocking member 12 and the left rocking member 13 are swung in the direction indicated by the symbol A by rotating the rocking shaft 14 by the displacement motor 15. As a result, the transport driving roller 51 is displaced in the direction indicated by the symbol B along the shape of the support long hole 11 a of the support member 11. At this time, since the driving gear 16 is displaced along the outer peripheral surface of the small-diameter gear portion 172 of the first intermediate gear 17, the conveyance driving roller 51 is meshed with the driving gear 16 and the small-diameter gear portion 172 of the first intermediate gear 17. Displacement is maintained. Therefore, the transmission path of the rotational driving force of the transport motor 58 to the transport drive roller 51 is maintained before and after the displacement.

FIG. 8 is a principal side sectional view illustrating a state in which the recording paper P is conveyed by the recording material conveying apparatus 1. FIG. 9 is an enlarged side view of a part of the transport drive roller support device 10. FIG. 10 is an enlarged side sectional view of a part of the recording material transport apparatus 1. FIG. 11 is a side cross-sectional view of a main part of a recording material transport apparatus according to the prior art.
In the ink jet printer 50, a detector (not shown) capable of detecting the leading end and the trailing end of the recording paper P in the transport direction Y is provided in the feeding path 75 between the automatic feeding device 70 and the transport driving roller 51. It has been. The ink jet printer 50 includes a known rotary encoder (not shown) that can detect the rotation direction and the rotation amount of the transport drive roller 51. The recording control unit 100 as a “control device” is configured to control the conveyance motor 58 based on the leading end position in the conveyance direction Y of the recording paper P detected by the detector provided in the feeding path 75 and the output signal of the rotary encoder. Execute control. Further, the recording control unit 100 controls the displacement motor 15 of the transport driving roller support device 10 based on the rear end position of the recording paper P in the transport direction Y detected by the detector provided in the feeding path 75. Execute.

  The fed recording paper P is first sandwiched between the transport driving roller 51 and the transport driven roller 52, and is transported in the transport direction Y as the transport drive roller 51 rotates in the direction indicated by the symbol F (FIG. 8 (a)). Further, after the leading end of the recording paper P in the transport direction Y reaches the contact point between the discharge driving roller 54 and the discharge driven roller 55, the trailing end of the recording paper P in the transport direction Y is the transport driving roller 51 and the transport driven roller. The sheet is conveyed in the conveyance direction Y by the conveyance driving roller 51, the conveyance driven roller 52, the discharge driving roller 54, and the discharge driven roller 55 until immediately before the separation from the contact point with the nozzle 52 (FIG. 8B). The recording paper P is transported in the transport direction Y by the discharge drive roller 54 and the discharge driven roller 55 after the rear end of the transport direction Y is separated from the contact point between the transport drive roller 51 and the transport driven roller 52. Discharged.

  Here, as in the conventional recording material transport apparatus, if the transport of the recording paper P is continued without displacing the transport drive roller 51, the rear end of the recording paper P in the transport direction Y is the transport drive roller. When separated from the contact point between the roller 51 and the transport driven roller 52, the rear side of the recording paper P is lifted from the top surface of the platen rib 531 as indicated by reference numeral H (FIG. 11). This is because, as described above, the vertical interval α between the top surface S1 (recording material support surface) of the platen rib 531 and the tangent S2 at the apex of the outer peripheral surface of the transport driving roller 51 is set to a predetermined interval. is there.

  In the recording material conveying apparatus 1 according to the present invention, the recording control unit 100 is used for the displacement immediately before the trailing end of the conveying direction Y of the recording paper P is separated from the contact point between the conveying driving roller 51 and the conveying driven roller 52. The motor 15 is rotated to swing the right swing member 12 and the left swing member 13 in the direction indicated by reference numeral A1. As a result, the transport drive roller 51 is displaced in the direction indicated by reference numeral B1, and the transport driven roller 52 is displaced in the direction indicated by reference sign G following the displacement of the transport drive roller 51 (FIG. 8 (c). ), FIG. 9). After the transport driving roller 51 is displaced, the top surface S1 of the platen rib 531, the tangent S2 at the apex of the outer peripheral surface of the transport driving roller 51, and the tangent at the contact point between the outer peripheral surface of the transport driving roller 51 and the outer peripheral surface of the transport driven roller 52. All of S3 are substantially coincident with each other, and the interval α and the angle β are both substantially 0 (FIG. 10).

  As described above, the conveyance driving roller 51 is displaced in the direction in which the interval α is narrower than the predetermined interval before the trailing end of the conveyance direction Y of the recording paper P is released from the nipping by the conveyance driving roller 51 and the conveyance driven roller 52 at the latest. Let Accordingly, the possibility that the rear side of the recording paper P is lifted from the top surface of the platen rib 531 when the rear end of the recording paper P in the transport direction Y is released from the nipping by the transport driving roller 51 and the transport driven roller 52 is reduced. be able to.

  Therefore, according to the recording material conveying apparatus 1 according to the present invention, in the inkjet printer 50, recording is performed when the rear end of the recording paper P in the conveying direction Y is released from the nipping by the conveying driving roller 51 and the conveying driven roller 52. It is possible to reduce the possibility of the accuracy being lowered.

  Further, as described above, the transmission path of the rotational driving force of the conveyance motor 58 to the conveyance drive roller 51 is maintained before and after the displacement. The transport driven roller 52 is displaced in the direction indicated by the symbol G following the displacement of the transport drive roller 51. Accordingly, even after the transport driving roller 51 is displaced, the recording paper P can be sandwiched and transported by the transport driving roller 51 and the transport driven roller 52 while maintaining a predetermined clamping pressure. Therefore, even if the conveyance driving roller 51 is displaced in a direction in which the interval α becomes narrower than the predetermined interval before the trailing end of the conveyance direction Y of the recording paper P is released from the nipping by the conveyance driving roller 51 and the conveyance driven roller 52. Further, it is possible to maintain a state in which the recording paper P can be conveyed with high accuracy by the conveyance driving roller 51 and the conveyance driven roller 52 and the discharge driving roller 54 and the discharge driven roller 55.

  In addition, by displacing the conveyance drive roller 51 while maintaining the transmission path of the rotational driving force of the conveyance motor 58 to the conveyance drive roller 51, the conveyance drive roller 51 rotates in the reverse feed direction while being displaced. become. For this reason, a loss in the conveyance amount corresponding to the displacement amount occurs. For example, the cumulative value of the conveyance amount of the recording paper P managed by the recording control unit 100 based on the output signal of the rotary encoder, etc. By subtracting the conveyance amount corresponding to the loss from the above, it is possible to prevent a large conveyance error caused by the loss.

  Further, when the transport drive roller 51 is displaced while the recording paper P is sandwiched between the transport drive roller 51 and the transport driven roller 52, the amount corresponding to the amount of displacement of the transport drive roller 51 in the transport direction Y is the same. There is a risk of overfeeding of the recording paper P. In this case, for example, immediately before the transport drive roller 51 is displaced, the transport amount corresponding to the overfeed is added to the cumulative value of the transport amount of the recording paper P managed by the recording control unit 100 and adjusted. This can prevent a large conveyance error. Alternatively, the transport error of the overfeed may be dispersed by displacing the transport drive roller 51 at a low speed or by gradually displacing the transport drive roller 51 by dividing it into a plurality of times.

  Further, in the recording material conveying apparatus 1 according to the present invention, the conveying driving roller 51 is displaced in the direction in which the interval α is narrower than the predetermined interval and the angle β is smaller than the predetermined angle as in the above embodiment. Is preferred. This reduces the possibility that the rear side of the recording paper P is lifted from the top surface of the platen rib 531 when the rear end of the recording paper P in the transport direction Y is released from the nipping by the transport driving roller 51 and the transport driven roller 52. Can be made. Furthermore, it is possible to further reduce the variation in the conveyance load at the time of separation by the amount by which the pressing force due to the angle β decreases.

  Further, as the displacement direction and displacement amount of the conveyance drive roller 51, the effect of the present invention can be obtained by displacing the conveyance drive roller 51 in a direction in which at least the interval α is narrower than the predetermined interval. In addition, it is more preferable and ideal that the transport driving roller 51 is displaced to a position where the interval α and the angle β become zero. As a result, when the rear end of the recording paper P in the transport direction Y is released from the nipping by the transport driving roller 51 and the transport driven roller 52, the rear side of the recording paper P may be further lifted from the top surface of the platen rib 531. Can be reduced.

  Further, the timing of displacing the transport driving roller 51 is as long as it is before the trailing end of the recording paper P in the transport direction Y is released from the nipping by the transport driving roller 51 and the transport driven roller 52. Although it is obtained, it is preferable to set it immediately before leaving from the contact point as in the above embodiment. Accordingly, the interval α and the angle β are set to the predetermined interval and the predetermined angle until immediately after the rear end of the conveyance direction Y of the recording paper P is detached from the contact point between the outer peripheral surface of the transport driving roller 51 and the outer peripheral surface of the transport driven roller 52. The recording paper P can be transported in an ideal state set in the above.

<Other embodiments>
As another embodiment of the present invention, in the above embodiment, a mechanism for separating the transport driven roller 52 from the transport driving roller 51 can be provided. Accordingly, the conveyance driven roller 52 can be temporarily separated from the conveyance driving roller 51. More specifically, for example, a displacement mechanism for displacing the driven roller holder 532 supporting the transport driven roller 52 in the vertical direction may be provided. As a means for operating the displacement mechanism of the driven roller holder 532, for example, if a swing lever that engages with the displacement mechanism is provided on one end side or the other end side of the reciprocating region of the carriage 61, the carriage 61 While the swing lever is being pushed and swung, the driven roller holder 532 can be displaced upward so that the transport driven roller 52 is separated from the transport drive roller 51.

  By providing such a mechanism, for example, the conveyance driving roller 51 can be displaced after the rotation of the conveyance driving roller 51 is stopped and the conveyance driven roller 52 is separated from the conveyance driving roller 51. Then, after the transport driving roller 51 is displaced, the transport driven roller 52 is brought into contact with the transport driving roller 51 again, and the transport of the recording paper P by the rotation of the transport driving roller 51 can be resumed. By displacing the transport driving roller 51 in this way, it is possible to reduce the possibility that a transport error of the recording paper P occurs due to the displacement of the transport driving roller 51.

  Further, when the rear end of the recording paper P in the transport direction Y is separated from the contact point between the outer peripheral surface of the transport driving roller 51 and the outer peripheral surface of the transport driven roller 52, the transport driven roller 52 is separated from the transport driving roller 51. If it is in the state, it is possible to further reduce the fluctuation of the transport load at the time of separation. Therefore, for example, there is an advantage that the conveyance error of the recording paper P hardly occurs even if the conveyance driving roller 51 is displaced at a rapid displacement speed.

  Furthermore, as another embodiment of the present invention, the rotation transmission mechanism of the conveyance motor 58 with respect to the conveyance drive roller 51 can be realized by a belt transmission mechanism using an endless belt. In this case, for example, a known auto tension mechanism is preferably provided to suppress fluctuations in belt tension so as not to cause conveyance errors due to fluctuations in belt tension due to displacement of the conveyance drive roller 51.

  The scope of application of the present invention is not particularly limited to an ink jet printer, and it is needless to say that the present invention can be applied to all electronic devices including a recording material conveying device for conveying a recording material.

  For example, the present invention can be carried out in all recording apparatuses including means for executing recording on recording paper conveyed by a recording material conveying apparatus such as a laser printer and a dot impact printer. An effect can be obtained. Furthermore, the present invention can also be implemented in an electronic device such as a scanner device, a copying machine, and a facsimile machine provided with means for reading information recorded on a recording paper or the like conveyed by a recording material conveying device. The effect by can be obtained.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

1 is a side sectional view of an ink jet printer. The principal part side sectional drawing of the recording material conveying apparatus which concerns on this invention. 1 is a perspective view of a main part of a recording material transport device according to the present invention. The principal part top view of the recording material conveying apparatus which concerns on this invention. 1 is an enlarged perspective view of a part of a recording material transport device according to the present invention. 1 is an enlarged perspective view of a part of a recording material transport device according to the present invention. The side view which illustrated typically the principal part of the recording material conveying apparatus. FIG. 3 is a side cross-sectional view illustrating a state in which recording paper is conveyed by a recording material conveyance device. The side view which expanded and illustrated a part of conveyance drive roller support apparatus. FIG. 3 is an enlarged side sectional view of a part of the recording material conveying apparatus. The principal part side sectional drawing of the recording material conveying apparatus in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Recording material conveying apparatus, 10 Conveyance drive roller support apparatus, 11 Support member, 12 Right rocking member, 13 Left rocking member, 14 Swing shaft, 15 Displacement motor, 16 Drive gear, 17 1st intermediate gear , 18 Second intermediate gear, 50 Ink jet printer, 51 Conveying drive roller, 52 Conveying driven roller, 53 Platen, 54 Discharging driving roller, 55 Discharging driven roller, 56 Carriage guide shaft, 58 Conveying motor, 61 Carriage, 62 Recording head , 70 Automatic feeding device, 100 Recording control unit, P recording paper, X width direction, Y transport direction

Claims (7)

A recording material support surface for supporting the recording material;
A first transport device disposed upstream of the recording material support surface in the transport direction;
A second transport device disposed downstream of the recording material support surface in the transport direction,
The first transport device includes a transport drive roller that rotates when a rotational driving force is transmitted, and a transport driven roller that is urged toward the outer peripheral surface of the transport drive roller and is rotatably supported.
A vertical interval α between the apex of the recording material support surface and the apex of the outer peripheral surface of the transport driving roller is set to a predetermined interval, and the outer peripheral surface of the transport driving roller with respect to the recording material support surface and the transport In the recording material conveying apparatus in which the angle β of the tangent at the contact point with the outer peripheral surface of the driven roller is set to a predetermined angle,
A conveyance drive roller support device is provided that supports the conveyance drive roller so that the interval α can be displaced in a direction in which the interval α is narrower than the predetermined interval while maintaining a rotatable state by transmitting a rotation driving force. Recorded material transport device.   2. The recording material transport apparatus according to claim 1, wherein the transport drive roller support device is displaceable in a direction in which the interval α is narrower than the predetermined interval and in a direction in which the angle β is smaller than the predetermined angle. A recording material conveying apparatus characterized by supporting a driving roller.   3. The recording material transport apparatus according to claim 1, wherein the transport driven roller is supported to be displaceable following the displacement of the transport drive roller.   The recording material transport apparatus according to claim 1, further comprising a mechanism that separates the transport driven roller from the transport drive roller.   5. The recording material transport apparatus according to claim 1, wherein the transport driving roller support device is controlled based on a transport position of the recording material and a transport position of the recording material. A recording material conveying device comprising: a control device.   6. The recording material transport apparatus according to claim 5, wherein the control device separates a rear end of the recording material in the transport direction from a contact point between an outer peripheral surface of the transport driving roller and an outer peripheral surface of the transport driven roller. A recording material conveying apparatus, wherein the conveying driving roller is displaced immediately before the recording. A recording material conveying apparatus according to any one of claims 1 to 6,
An electronic apparatus comprising: means for performing recording on a recording material supported on the recording material support surface; or means for reading information recorded on the recording material supported on the recording material support surface.

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