JP2005247434A - Feeding device, recording device equipped with it, liquid jetting device, and feeding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a feeding device and a feeding method capable of lowering the back tension applied from a side wall by putting a recording medium (sheet of paper) in a skew while enlargement of the recording device is suppressed. <P>SOLUTION: A control device controls so that a transport roller 27 is rotated reversely from the leading edge of the recording medium P being fed slightly in the sheet feeding direction by the transport roller 27 till disengagement of the leading edge of the recoding medium being engaged with the transport roller, and then the transport roller is again rotated in the feeding direction of the recording medium. A feed drive roller 15 is installed nearer the one-side edge guide part than the middle position between the one-side edge guide part 79 and the other side edge guide part 81, and the other side edge guide part is furnished with a projection 83 protruding toward the one-side edge guide part and a non-guide part 82. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a recording apparatus. The present invention further relates to a liquid ejecting apparatus such as an ink jet recording apparatus that ejects a liquid such as ink from a head to eject the liquid onto an ejected medium.

Here, the liquid ejecting apparatus uses an ink jet recording head, and is not limited to a recording apparatus such as a printer, a copying machine, and a facsimile machine that records ink on a recording medium by discharging ink from the recording head. It includes a device that ejects a liquid corresponding to the application from a liquid ejecting head corresponding to the recording head to an ejected medium corresponding to a recording medium and adheres the liquid to the ejected medium.
In addition to the recording head, as a liquid ejecting head, a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, an electrode material used for forming an electrode such as an organic EL display or a surface emitting display (FED) Paste) jet head, bio-organic matter jet head used for biochip manufacturing, sample jet head as precision pipette, and the like.

  In Japanese Patent Laid-Open No. 2001-240253 (Patent Document 1), the sheet conveyance distance from the most downstream point where the pressing force by the sheet side edge aligning member provided in the sheet feeding cassette acts on the sheet side end to the conveyance roller is described. Set slightly larger than the paper length, and when the leading edge of the paper is nipped by the transport roller, the trailing edge of the paper is out of the working area of the paper-side edge aligning member, so that the paper-side edge is not in contact with both end walls of the paper cassette It has been disclosed to realize a highly accurate paper conveyance in a state.

JP 2001-240253 A

  When the back tension is released by avoiding the contact state with the side wall as in Patent Document 1, it is conceivable that the paper is skewed in either direction during paper feeding. However, in this case, since the variation in the print start position in the digit direction (main scanning direction) becomes large, there is a problem that it is necessary to make a large adjustment area, and the entire recording apparatus becomes large.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a feeding device and a feeding method that reduce a back tension received from a side wall by skewing a recording medium (paper) while suppressing an enlargement of the recording device.

  In order to achieve the above object, a feeding device according to a first aspect of the present invention includes a placement unit on which a plurality of recording media can be placed, and one side that guides one side of the recording media. A feed cassette provided with a side guide, and provided on the downstream side of the feed cassette in the feeding direction, and can be rotated so that the recording medium can be fed to the recording head side. A regulated feed roller, a transport roller provided on the downstream side of the feed roller and rotatable in the feeding direction of the recording medium and in the opposite direction, and the leading end of the recording medium are slightly fed by the transport roller. After being fed in the feeding direction, the conveying roller is reversed until the state of engagement of the leading edge of the recording medium with the conveying roller is released, and then the conveying roller is rotated again in the feeding direction of the recording medium. A control device for controlling, the feeding roller, Provided near the side guide portion, the one side guide portion is formed with a guide region capable of guiding the rear end of the recording medium when the leading end of the recording medium reaches the conveying roller. It is characterized by.

  According to the first aspect of the present invention, since the feeding roller is provided near the one side guide portion, the leading edge of the recording medium is referred to as the one side guide portion as the recording medium is fed. Skew to the other side. Then, after the leading edge of the recording medium is slightly fed in the feeding direction by the conveying roller in the skew state, when the conveying roller is reversed until the engagement state of the leading edge of the recording medium to the conveying roller is released, Since rotation of the feeding roller in the reverse direction is restricted, the recording medium is lightly bent while the feeding roller grips the recording medium lightly. Further, at this time, the recording medium slips with respect to the feeding roller by the force to return the bending, and one side of the recording medium is separated from the one side guide part.

  Accordingly, since one side of the recording medium is not in contact with the one side guide portion, back tension due to frictional resistance between the side of the recording medium and the guide portion is not applied during subsequent feeding, and the Even when recording is started with zero merge from the front end of the recording medium, accurate recording is possible. Further, in the present invention, once the recording medium is skewed and returned to the non-skewed state, the variation in the recording start position in the main scanning direction does not increase, and it is not necessary to make a large adjustment area. Does not grow.

The feeding device according to a second aspect of the present invention is the feeding device according to the first aspect, wherein the feeding cassette includes an other side guide portion for guiding the other side of the recording medium, and the other side. The side guide portion is formed at an end on the upstream side in the feeding direction of the recording medium, and protrudes toward the one side guide portion, and a non-guide portion on the downstream side in the feeding direction from the projection. And are formed.
According to this aspect, the other side of the recording medium can be guided by the other side guide portion.

The feeding device according to a third aspect of the present invention is the feeding device according to the first or second aspect, wherein the recording medium is in contact with the protrusion before feeding is started, and the leading end of the recording medium is Is in a non-contact state with the other side guide portion before reaching the conveying roller.
According to this aspect, before feeding is started, one side of the recording medium is in contact with the one side guide part and the other side is in contact with the protruding part. When the hopper moves up and down, the recording medium is restricted from moving left and right. Further, when the recording medium is removed from the projection during feeding, the other side of the recording medium is not in contact with the guide, and the frictional resistance between the other side guide and the other side of the recording medium is caused. There is no back tension.

In the feeding device according to the fourth aspect of the present invention, in the second or third aspect, the other side guide portion is an edge guide that is slidable in the main scanning direction. It is what.
According to this aspect, a plurality of types of recording media can be fed by sliding the edge guide in the main scanning direction.

  Further, the feeding device according to the fifth aspect of the present invention includes a placement portion on which a plurality of recording media can be placed, and a side guide portion that guides one side of the recording media. The feeding cassette provided and the feeding cassette provided downstream in the feeding direction of the feeding cassette and capable of rotating so that the recording medium can be fed to the recording head side, but the rotation in the reverse direction is restricted A roller, a conveyance roller that is provided downstream of the feeding roller and is rotatable in the feeding direction of the recording medium and in the opposite direction, and the leading end of the recording medium is slightly fed out in the feeding direction by the conveyance roller. And a control device that controls the conveyance roller to reverse until the leading edge of the recording medium is parallel to the axis of the conveyance roller, and then again rotates the conveyance roller in the feeding direction of the recording medium. The feeding roller is provided near the one side guide portion. The one side guide portion is formed with a guide region capable of guiding the trailing edge of the recording medium when the leading edge of the recording medium reaches the conveyance roller. .

  According to this aspect, since the feeding roller is provided closer to the one side guide part, the leading edge of the recording medium is skewed to the opposite side of the one side guide part as the recording medium is fed. . Then, after the leading end of the recording medium is slightly fed in the feeding direction by the conveying roller in the skew state, the conveying roller is reversed until the leading end of the recording medium becomes parallel to the axis of the conveying roller. At this time, since the rotation of the feeding roller in the reverse direction is restricted, the recording medium is lightly bent while the feeding roller gently grips the recording medium. Further, at this time, the recording medium slips with respect to the feeding roller by the force to return the bending, and one side of the recording medium is separated from the one side guide part.

  Accordingly, since one side of the recording medium is not in contact with the one side guide portion, back tension due to frictional resistance between the side of the recording medium and the guide portion is not applied during subsequent feeding, and the Even when recording is started with zero merge from the front end of the recording medium, accurate recording is possible. Incidentally, after the leading edge of the recording medium becomes parallel to the axis of the conveying roller, the recording medium is fed without skew by rotating the conveying roller in the feeding direction of the recording medium again.

  Further, the feeding device according to the sixth aspect of the present invention includes a placing portion on which a plurality of ejected media can be placed, and a one side guide portion that guides one side of the ejected media. A feed cassette provided on the downstream side in the feed direction of the feed cassette and capable of rotating the medium to be ejected to the liquid jet head side, but rotation in the reverse direction is restricted. A feed roller, a transport roller provided downstream of the feed roller and rotatable in the feed direction of the ejected medium and in the opposite direction, and the tip of the ejected medium is slightly fed out in the feed direction by the transport roller. After that, the control device controls to reverse the transport roller until the state of engagement of the tip of the ejected medium with the transport roller is released, and then to rotate the transport roller again in the feeding direction of the ejected medium And the feeding roller includes the one side guide portion. The one side guide part is formed with a guide region capable of guiding the rear end of the ejected medium when the front end of the ejected medium reaches the transport roller. Is.

  Further, the feeding device according to the seventh aspect of the present invention includes a placing portion on which a plurality of ejected media can be placed, and a one side guide portion that guides one side of the ejected media. A feed cassette provided on the downstream side in the feed direction of the feed cassette and capable of rotating the medium to be ejected to the liquid jet head side, but rotation in the reverse direction is restricted. A feed roller, a transport roller provided downstream of the feed roller and rotatable in the feed direction of the ejected medium and in the opposite direction, and the tip of the ejected medium is slightly fed out in the feed direction by the transport roller. And a control device that controls the conveying roller to rotate in the reverse direction until the tip of the ejected medium becomes parallel to the axis of the conveying roller, and then rotates the conveying roller again in the feeding direction of the ejected medium. The feeding roller is closer to the one side guide portion. The one side guide portion is formed with a guide region capable of guiding the rear end of the ejected medium when the front end of the ejected medium reaches the transport roller. is there.

  A liquid ejecting apparatus according to an eighth aspect of the invention includes the feeding device according to any one of claims 1 to 7. According to this aspect, since the back tension in the feeding direction is eliminated in the feeding process of the ejected medium, accurate feeding can be realized, and therefore, recording is started with zero merge from the front end of the ejected medium. In some cases, accurate recording is possible.

  According to a ninth aspect of the present invention, there is provided a feeding method including a one side guide part that guides one side of a recording medium, and a downstream side in the feeding direction of the feeding cassette. The recording medium can be rotated so that the recording medium can be fed, but the rotation in the reverse direction is restricted, and the downstream side of the feeding roller is provided, and the feeding direction of the recording medium is A feed roller that is rotatable in the opposite direction, and the feed roller is provided near the one side guide portion, and a leading end of a recording medium reaches the feed roller at the one side guide portion. A recording medium feeding method by a feeding device in which a guide area capable of guiding the trailing edge of the recording medium is formed at the time when the recording medium is guided by a side guide portion. A step of feeding by a feed roller, and driving the feed roller A step of skewing the recording medium to the opposite side of the one side guide portion, and after feeding the recording medium to a position where the leading edge of the recording medium is slightly fed in the feeding direction by the transport roller, While the rotation of the feeding roller is stopped, the conveying roller is reversed to release the engagement state of the leading end of the recording medium with the conveying roller, and one side of the recording medium is guided to one side. And a step of feeding the recording medium by rotating the feeding roller and the conveying roller again in the feeding direction.

  According to this aspect, the recording medium is guided to the one side guide portion at the start of feeding, but since the feeding roller is provided closer to the one side guide portion, the recording medium is recorded as feeding progresses. The leading edge of the medium is skewed to the opposite side of the one side guide portion. Then, after the leading edge of the recording medium is slightly fed in the feeding direction by the conveying roller in the skew state, when the conveying roller is reversed until the engagement state of the leading edge of the recording medium to the conveying roller is released, Since rotation of the feeding roller in the reverse direction is restricted, the recording medium is lightly bent while the feeding roller grips the recording medium lightly. Further, at this time, the recording medium slips with respect to the feeding roller by the force to return the bending, and one side of the recording medium is separated from the one side guide part.

  Accordingly, since one side of the recording medium is not in contact with the one side guide portion, back tension due to frictional resistance between the side of the recording medium and the guide portion is not applied during subsequent feeding, and the Even when recording is started with zero merge from the front end of the recording medium, accurate recording is possible. Further, in the present invention, once the recording medium is skewed and returned to the non-skewed state, the variation in the recording start position in the main scanning direction does not increase, and it is not necessary to make a large adjustment area. Does not grow.

  According to a tenth aspect of the present invention, there is provided a feeding cassette including a one side guide portion that guides one side of an ejection target medium, and a downstream side of the feeding cassette in a feeding direction. Provided on the downstream side of the feed roller, and the feed direction of the jetted medium, A feed roller that is rotatable in the opposite direction, and the feed roller is provided near the one side guide portion, and a tip of the ejection medium reaches the feed roller at the one side guide portion. A method of feeding a medium to be ejected by a feeding device in which a guide region capable of guiding the rear end of the medium to be ejected is formed, wherein the medium to be ejected is guided by one side guide portion. The process of feeding by the feed roller and the drive by the feed roller A step of skewing the ejected medium to the opposite side of the one side guide portion, and after feeding the ejected medium to a position where the tip of the ejected medium is slightly fed out in the feeding direction by the transport roller; While the rotation of the feeding roller is stopped, the transport roller is reversed to release the engagement state of the tip of the ejected medium with the transport roller, and one side of the ejected medium is set to one side. The method includes a step of separating from the guide unit, and a step of feeding the ejection target medium by rotating the feeding roller and the conveying roller again in the feeding direction.

  According to an eleventh aspect of the present invention, there is provided a feeding cassette including a one side guide portion that guides one side of a recording medium, and a downstream side of the feeding cassette in a feeding direction. The recording medium can be rotated so that the recording medium can be fed, but the rotation in the reverse direction is restricted, and the downstream side of the feeding roller is provided, and the feeding direction of the recording medium is A feed roller that is rotatable in the opposite direction, and the feed roller is provided near the one side guide portion, and a leading end of a recording medium reaches the feed roller at the one side guide portion. A recording medium feeding method by a feeding device in which a guide area capable of guiding the trailing edge of the recording medium is formed at the time when the recording medium is guided by a side guide portion. The process of feeding by the feed roller and the drive by the feed roller A step of skewing the recording medium to the opposite side of the one side guide portion, and after feeding the recording medium to a position where the leading edge of the recording medium is slightly fed in the feeding direction by the transport roller, While the rotation of the feeding roller is stopped, the conveying roller is reversed, and the recording medium is returned to the side opposite to the feeding direction until the leading end of the recording medium is parallel to the axis of the conveying roller. A step of bringing one side of the recording medium away from the one side guide part, and a step of feeding the recording medium by rotating the feeding roller and the conveying roller in the feeding direction again. It is characterized by this.

  According to this aspect, the recording medium is guided to the one side guide portion at the start of feeding, but since the feeding roller is provided closer to the one side guide portion, the recording medium is recorded as feeding progresses. The leading edge of the medium is skewed to the opposite side of the one side guide portion. Then, after the leading end of the recording medium is slightly fed in the feeding direction by the conveying roller in the skew state, the conveying roller is reversed until the leading end of the recording medium becomes parallel to the axis of the conveying roller. At this time, since the rotation of the feeding roller in the reverse direction is restricted, the recording medium is lightly bent while the feeding roller gently grips the recording medium. Further, at this time, the recording medium slips with respect to the feeding roller by the force to return the bending, and one side of the recording medium is separated from the one side guide part.

  Accordingly, since one side of the recording medium is not in contact with the one side guide portion, back tension due to frictional resistance between the side of the recording medium and the guide portion is not applied during subsequent feeding, and the Even when recording is started with zero merge from the front end of the recording medium, accurate recording is possible. Incidentally, after the leading edge of the recording medium becomes parallel to the axis of the conveying roller, the recording medium is fed without skew by rotating the conveying roller in the feeding direction of the recording medium again.

  According to a twelfth aspect of the present invention, there is provided a feeding cassette including a one side guide portion that guides one side of the ejection target medium, and a downstream side of the feeding cassette in the feeding direction. Provided on the downstream side of the feed roller, and the feed direction of the jetted medium, A feed roller that is rotatable in the opposite direction, and the feed roller is provided near the one side guide portion, and a tip of the ejection medium reaches the feed roller at the one side guide portion. A method of feeding a medium to be ejected by a feeding device in which a guide region capable of guiding the rear end of the medium to be ejected is formed, wherein the medium to be ejected is guided by one side guide portion. The process of feeding by the feed roller and the drive by the feed roller A step of skewing the ejected medium to the opposite side of the one side guide portion, and after feeding the ejected medium to a position where the tip of the ejected medium is slightly fed out in the feeding direction by the transport roller; While the rotation of the feeding roller is stopped, the conveying roller is reversed and the ejected medium is returned to the side opposite to the feeding direction until the tip of the ejected medium becomes parallel to the axis of the conveying roller. A step of bringing one side of the ejected medium away from the one side guide part, and a step of feeding the ejected medium by rotating the feeding roller and the conveying roller in the feeding direction again. It is characterized by this.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view showing a schematic configuration of an ink jet recording apparatus to which a feeding apparatus according to the present invention is applied, and FIG. 2 is a top view of the feeding apparatus showing a state at the start of feeding a recording medium. 3 is an enlarged perspective view of the edge guide, FIG. 4 is a partially enlarged perspective view of the periphery of the feeding device and the feeding roller, and FIG. FIG. 6 is a top view of the feeding device showing a state where the recording has started, FIG. 6 is a top view of the feeding device when the front end of the recording medium reaches a position immediately before the transport driving roller, and FIG. FIG. 8 is a top view of the feeding device when the recording medium is slightly advanced, and FIG. 8 is a top view of the feeding device showing a state in which the transport driving roller rotates backward and returns to a non-engaged state with the transport roller. FIG. 9 is a top view of the feeding device showing a state in which the recording medium is finally fed. A diagram, FIG. 10 is a top view of the feeding apparatus showing a state in which the return from the state of FIG. 7 to the front end of the recording medium is parallel to the conveying roller axis.

  In the ink jet recording apparatus 1, a feeding cassette 3 on which recording media P such as plain paper can be stacked is detachably disposed on the front surface as a component of the feeding apparatus 2. Recording is performed on the fed recording medium P, and the recorded recording medium P is discharged to a discharge tray (not shown). Inside the feeding cassette 3, a hopper 7 for automatically feeding the recording media P stacked on the feeding cassette 3 is disposed so as to be swingable about a shaft 9 as a swinging shaft. At the time of feeding, the hopper 7 swings upward by the spring force of the contracted spring 11, and the uppermost recording medium P of the recording media P stacked on the hopper 7 is arranged on the feeding cassette 3 side. It is pressed by the pickup roller 13 provided. The recording medium P is pulled out from the feeding cassette 3 by the rotation of the pickup roller 13 and sent out in the feeding direction A toward the feeding drive roller 15 and the retard roller 17 disposed on the ink jet recording apparatus 1 side. It is. The feed roller 18 and the retard roller 17 constitute a feed roller 18.

  The ink jet recording apparatus 1 is provided with a feed driving roller 15 and a retard roller 17. The feed drive roller 15 is driven to rotate in the feed rotation direction AF when a rotational drive force of a feed drive motor (not shown) is transmitted, and does not rotate in the opposite direction due to the action of the one-way clutch. The retard roller 17 is pivotally supported on the shaft 21 so as to be driven to rotate in a state having a certain rotational resistance, and is pressed against the feed driving roller 15 during the feeding operation. The recording medium P drawn from the feeding cassette 3 by the rotation of the pickup roller 13 is sandwiched between the retard roller 17 and the feeding driving roller 15 in the feeding rotation direction AF of the feeding driving roller 15. Is fed toward the transport driving roller 23 and the transport driven roller 25 (the transport roller 27 together).

  The retard roller 17 is pivotally supported so as to be driven to rotate with the shaft 21 having a certain rotational resistance as described above. This rotational resistance is set to be smaller than the frictional resistance of the peripheral surface of the feeding drive roller 15 and larger than the frictional resistance between the recording media P that are overlapped. That is, if the friction coefficient between the feeding drive roller 15 and the recording medium P is μ1, the friction coefficient between the recording medium P is μ2, and the friction coefficient between the recording medium P and the retard roller 17 is μ3. , Μ1> μ3> μ2 is selected so that the high friction material forming the outer peripheral surfaces of the feed driving roller 15 and the retard roller 17 is selected.

  Therefore, in a state where a plurality of recording media P are sandwiched between the feeding drive roller 15 and the retard roller 17, only the uppermost recording medium is in contact with the peripheral surface of the feeding drive roller 15. The paper is fed by the driving rotation of the feed driving roller 15. Since the driven rotational resistance of the retard roller 17 is larger than the frictional resistance between the overlapping recording media P, the recording media P other than the uppermost recording media P are stopped at that position by the retard roller. The recording medium P stopped in this position is returned onto the hopper 7 by a return lever 19 operated at a predetermined timing.

  When only one recording medium P is sandwiched between the feeding drive roller 15 and the retard roller 17, the frictional resistance of the circumferential surface of the feeding drive roller 15 is greater than the driven rotational resistance of the retard roller 17. Therefore, the retard roller 17 is driven to rotate in the feed driven rotation direction RF while being in contact with the recording medium P fed by the feed driving roller 15. In this manner, the plurality of recording media P are not fed in a state of being overlapped by the feed driving roller 15 and the retard roller 27 that functions to separate the recording media P to be double fed. The recording media P are fed one by one from the feeding cassette 3.

  The fed recording medium P is conveyed by a predetermined conveyance amount in the sub-scanning direction Y by the driving rotation of the conveyance driving roller 23 while being sandwiched between the conveyance driving roller 23 and the conveyance driven roller 25. . The conveyance drive roller 23 is formed with a high frictional resistance film on the peripheral surface with which the recording medium P is in contact, and the rotation driving force of a conveyance drive motor (not shown) is transmitted via an endless belt to rotate. The plurality of transport driven rollers 25 are individually urged by the transport driving roller 23 in a state where they are pivotally supported so as to be driven and rotated by the transport driven roller holder 31. The recording medium P is in close contact with the peripheral surface of the transport driving roller 23 by the urging force of the transport driven roller 25, and a predetermined transport amount in the sub-scanning direction Y by the rotation of the transport drive roller 23 controlled to rotate by a predetermined rotation amount. It is conveyed with high accuracy. The retard roller 17 does not hinder the conveyance operation of the recording medium P by the conveyance driving roller 23 after the leading end of the recording medium P is sandwiched between the conveyance driving roller 23 and the conveyance driven roller 25, that is, conveyance The feed drive roller 15 is separated from the load so as not to apply a load.

  The ink jet recording apparatus 1 includes a carriage 37 equipped with a recording head 35 that ejects ink onto a recording surface of a recording medium P that is transported on the platen 33 in the sub-scanning direction Y by the rotation of the transport driving roller 23. . The carriage 37 includes a main carriage 39 that is pivotally supported by a carriage guide shaft 41 so as to be reciprocable in the main scanning direction X (see FIG. 2), and a sub-carriage 43 on which the recording head 35 is mounted. The main carriage 39 is formed with a bearing main body 45, and a carriage guide shaft 41 is passed through the bearing 47 and the bearing 49 provided in the bearing main body 45. Each of the bearing portions 47 and 49 has an arc-shaped inner peripheral surface exceeding 180 degrees along the outer peripheral surface of the carriage guide shaft 41, and is thereby supported by the carriage guide shaft 41 and in the main scanning direction X. It is supported so that it can reciprocate. The carriage guide shaft 41 is supported by the main body of the ink jet recording apparatus 1 in parallel with the main scanning direction X, and is supported by left and right side frames (not shown).

  An endless belt 63 that extends in parallel with the carriage guide shaft 41 is connected to the carriage 37. The endless belt 63 is stretched between a drive rotation shaft of a carriage drive motor (not shown) and a driven pulley 69, and rotates in both directions by the drive rotation of the carriage drive motor. The carriage 37 reciprocates in the main scanning direction X by bidirectional rotation of the endless belt 63.

  An endless belt 63 that extends in parallel with the carriage guide shaft 41 is connected to the carriage 37. The endless belt 63 is stretched between a drive rotation shaft of a carriage drive motor (not shown) and a driven pulley 69, and rotates in both directions by the drive rotation of the carriage drive motor. The carriage 37 reciprocates in the main scanning direction X by bidirectional rotation of the endless belt 63.

  The ink jet recording apparatus 1 includes a discharge driving roller 71, a discharge driven roller 73, and a discharge auxiliary roller 75 in order to discharge the recording medium P after recording to a discharge tray. Each of the plurality of discharge driven rollers 73 is urged by the discharge drive roller 71 in a state where each of the discharge driven rollers 73 is rotatably supported by the frame, and when the recording medium P is discharged by the rotation of the discharge drive roller 73. The recording medium P is rotated in contact with the recording medium P while urging the recording medium P to the discharge driving roller 71 while contacting the recording medium P. The discharge auxiliary roller 75 is also pivotally supported by the discharge frame 53 so as to be driven to rotate. The recording medium is discharged onto the discharge tray while being rotated in contact with the recording surface of the recording medium P discharged in the discharge direction B. Guide P.

  Next, the characteristic configuration of the feeding device 2 of the present invention will be specifically described. As shown in FIGS. 2 and 4, in the feeding device 2, a left guide portion 79 (corresponding to one side guide portion) of the recording medium P is formed on the left side of the placement portion 77 on the feeding cassette 3. On the right side of the mounting portion 77, an edge guide 81 (corresponding to the other side guide portion) that can move in the left-right direction (main scanning direction) in FIG. 2 is provided. The edge guide 81 has a function of guiding the right side of the recording medium P by moving in the main scanning direction according to the size of the recording medium P. At the end of the edge guide 81 on the upstream side in the feeding direction (hereinafter simply referred to as the upstream side), there is a protruding portion 83 that protrudes toward the left guide portion 79 from the other portion (non-guide portion 82) of the edge guide 81. The recording medium P is formed with a certain short length in the feeding direction. As a result, a gap 85 that enables the recording medium P to be skewed is formed upstream of the protrusion 83.

  On the upstream side of the feeding device 2, the above-described feeding driving roller 15 is provided closer to the left guide portion 79 than an intermediate position between the left guide portion 79 and the edge guide 81. A one-way clutch 89 is provided on the right side of the rotation shaft 87 of the feed driving roller 15. The main point of providing this one-way clutch 89 is as follows.

  In order to prevent the recording medium from being fed in a skewed state in the feeding process of the recording medium P, the feeding driving roller 15 is engaged with the recording medium P by a certain amount of friction (biting operation). After that, the feeding drive roller is rotated in the reverse direction to bend the recording medium (discharge operation), and the leading end of the recording medium is pressed to the nip point. In order to form this bending, the force for holding the recording medium in the direction opposite to the feeding direction must be maintained at a certain level or more when the feeding driving roller 15 rotates in the reverse direction. Further, it is desirable to apply this holding force at the same time when the recording medium is returned in the direction opposite to the feeding direction from the viewpoint of accuracy and recording speed. Therefore, a one-way clutch 89 is provided to bend the recording medium so that the feed driving roller 15 is braked. By providing the one-way clutch 89, a constant holding force can be maintained without providing a complicated mechanism, and the timing at which the brake is applied after the discharge operation starts can be advanced, and a brake with good timing can be achieved.

Next, the feeding process by the feeding device 2 of the present invention will be specifically described. The ink jet recording apparatus 1 is provided with a control device 95 (see FIG. 1). The control device 95 performs the following control during feeding.
First, in FIG. 1, the hopper 7 rotates upward, and the pickup roller 13 takes out the uppermost recording medium P. As shown in FIG. 2, at the beginning of feeding, the left side of the recording medium P advances straight while being guided by the left guide portion 79 and the right side of the recording medium P is guided by the protrusion 83 of the edge guide 81.

  Next, as shown in FIG. 5, when the rear end PT of the recording medium P deviates from the upstream end of the protrusion 83, the feeding drive roller 15 is positioned closer to the left guide portion 79 and the recording medium P When the guide on the right side is lost, the left side of the recording medium P is driven more strongly than the right side, so that the leading edge of the recording medium P starts to skew to the right side.

  As shown in FIG. 6, the skew of the recording medium P gradually progresses until the front end of the recording medium P advances immediately before the conveyance roller 27. Then, as shown in FIG. 7, once the front end of the recording medium P is sandwiched between the transport driving roller 23 and the transport driven roller 25 and the recording medium P is slightly driven in the feeding direction, The drive of the recording medium P in the feeding direction is stopped, and the transport roller 27 is rotated in the reverse direction. At this time, the rear end of the left side of the recording medium P is within the guide area 91 of the left guide portion 79.

  When the transport roller 27 starts to reverse, the feed driving roller 15 stops rotating without being reversely rotated by the action of a one-way clutch (not shown). As a result, the left side of the recording medium P is driven more strongly due to the feeding drive roller 15 being positioned closer to the left guide portion 79, and the recording medium P is shown by an arrow 93 in FIG. The recording medium P travels upstream along a trajectory, and the recording medium P slips between the feed driving roller 15 and the retard roller 17 and returns to a direction in which the skew is reduced. Further, by feeding the recording medium P in the reverse direction by the conveying roller 27, the left side of the recording medium P is brought into a non-contact state with the left guide portion 79, and the right side of the recording medium P is brought into a non-contact state with the non-guide portion 82. Become. As described above, since the transport roller 27 is reversed and the feeding drive roller 15 is in a stopped state, the recording medium P is slightly bent, and the recording target P is caused by a force to return the bending to the original state. The front side of the medium P is pressed between the transport driving roller 23 and the transport driven roller 25 so as to be parallel to these.

  When the recording medium P is in such a state, when the feeding drive roller 15 and the transport roller 27 are rotated again in the feeding direction, the front side of the recording medium P is transported along with the transport driving roller 23. Since the recording medium P is fed while maintaining the state parallel to the roller 25, the recording medium P is fed straight without skew as shown in FIG. At this time, since neither the left side nor the right side of the recording medium P is in contact with the guide, no back tension is applied to the recording medium P, and the recording is started from the front end of the recording medium P with zero merge. Accurate recording is possible.

  Instead of the method of reversing the conveying roller 27 until the engagement state of the leading end of the recording medium P with the conveying roller 27 is released as described above, the state shown in FIG. The conveyance roller 27 is reversed until the front end of the medium P is in parallel with the axis of the conveyance roller 27 with the conveyance roller 27 engaged, and then the conveyance roller 27 is rotated again in the feeding direction of the recording medium P. You may control by the control apparatus 95 so that feeding may be performed.

  As described above, the embodiment in which the present invention is applied to the ink jet recording apparatus has been described. However, the present invention can also be applied to a liquid ejecting apparatus including a feeding device that feeds a medium to be ejected one by one. it can.

1 is a schematic side view showing a schematic configuration of an ink jet recording apparatus to which the present invention is applied. FIG. 6 is a plan view of a feeding device showing a state at the start of feeding of a recording medium. The enlarged perspective view of an edge guide. FIG. 3 is a partially enlarged perspective view of the periphery of a feeding device and a feeding roller. FIG. 3 is a plan view of the feeding device showing a state in which the rear end of the recording medium starts to deviate from the protrusion and starts skewing. FIG. 6 is a plan view of the feeding device when the front end of the recording medium reaches a position immediately before the conveyance drive roller. FIG. 3 is a plan view of a feeding device when a recording medium is slightly advanced by a conveyance driving roller. The top view of the feeder which shows the state which the conveyance drive roller reversely rotated and returned to the non-engagement state. FIG. 3 is a plan view of a feeding device showing a state in which a recording medium is finally fed. FIG. 3 is a plan view of the feeding device showing a state in which the front end of the recording medium is returned until it becomes parallel to the conveying roller axis.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet recording device, 2 Feeding device, 3 Feeding cassette, 7 Hopper, 9 axis | shaft, 11 Spring, 13 Pickup roller, 15 Feeding drive roller, 17 Retard roller,
18 Feeding roller, 19 Return lever, 21 shaft, 23 Transport drive roller,
25 transport driven roller, 27 transport roller, 31 transport driven roller holder,
33 Platen, 35 Recording head, 37 Carriage, 39 Main carriage,
41 Carriage guide shaft, 43 Subcarriage, 45 Bearing main body part, 47 Bearing part, 49 Bearing part, 63 Endless belt, 69 Driven pulley, 71 Discharge drive roller,
73 discharge driven roller, 75 discharge auxiliary roller, 77 mounting section, 79 left guide section,
81 edge guide, 82 non-guide portion, 83 protrusion, 85 gap,
87 Rotating shaft of feeding drive roller, 89 one-way clutch,
91 Guide area of the left guide part, 93 arrow, 95 control device, A feeding direction,
B discharge direction, P recording medium, PT rear end of recording medium, X main scanning direction,
Y Sub-scanning direction, RR rotation direction, AF feeding rotation direction, RF feeding driven rotation direction

Claims (12)

A feeding cassette including a placement section on which a plurality of recording media can be placed, and a one side guide portion that guides one side of the recording medium;
A feed roller provided on the downstream side in the feeding direction of the feeding cassette and capable of rotating so that the recording medium can be fed to the recording head side, but the rotation in the reverse direction is restricted;
A conveyance roller provided on the downstream side of the feeding roller and rotatable in the feeding direction of the recording medium and in the opposite direction;
After the leading edge of the recording medium is slightly fed in the feeding direction by the conveying roller, the conveying roller is reversed until the engaged state of the leading edge of the recording medium with the conveying roller is released, and then again the conveying roller. A control device for controlling the recording medium to rotate in the feeding direction of the recording medium,
The feeding roller is provided near the one side guide part, and the one side guide part can guide a rear end of the recording medium when a leading end of the recording medium reaches the transport roller. A feeding device in which a guide region is formed.   2. The feeding cassette according to claim 1, wherein the feeding cassette includes an other side guide portion that guides the other side of the recording medium, and the other side guide portion includes an end on the upstream side in the feeding direction of the recording medium. And a non-guide portion that is formed on the one side guide portion side and that is downstream of the protrusion portion in the feeding direction.   3. The recording medium according to claim 2, wherein the recording medium is in contact with the protruding portion before feeding is started, and is not in contact with the other side guide portion before the leading end of the recording medium reaches the conveyance roller. A feeding device characterized by being.   4. The feeding device according to claim 2, wherein the other side guide portion is an edge guide that is slidable in the main scanning direction. A feeding cassette including a placement section on which a plurality of recording media can be placed, and a one side guide portion that guides one side of the recording medium;
A feed roller provided on the downstream side in the feeding direction of the feeding cassette and capable of rotating so that the recording medium can be fed to the recording head side, but the rotation in the reverse direction is restricted;
A conveyance roller provided on the downstream side of the feeding roller and rotatable in the feeding direction of the recording medium and in the opposite direction;
After the leading edge of the recording medium is slightly fed in the feeding direction by the conveying roller, the conveying roller is reversed until the leading edge of the recording medium is parallel to the axis of the conveying roller, and then the conveying roller is again recorded. A control device that controls to rotate in the medium feeding direction,
The feeding roller is provided near the one side guide part, and the one side guide part can guide a rear end of the recording medium when a leading end of the recording medium reaches the transport roller. A feeding device in which a guide region is formed. A feeding cassette including a placement section on which a plurality of ejection target media can be placed, and a one side guide portion that guides one side of the ejection medium;
A feed roller provided on the downstream side in the feeding direction of the feeding cassette and capable of rotating so that the medium to be ejected can be fed to the liquid ejecting head side, but rotation in the reverse direction is restricted;
A conveyance roller that is provided on the downstream side of the feeding roller and is rotatable in the feeding direction of the ejected medium and in the opposite direction;
After the front end of the ejected medium is slightly fed in the feeding direction by the transport roller, the transport roller is reversed until the engaged state of the front end of the ejected medium with the transport roller is released, and then again the transport roller. And a control device that controls to rotate the jetting medium in the feeding direction,
The feeding roller is provided near the one side guide part, and the one side guide part can guide the rear end of the jetted medium when the tip of the jetted medium reaches the transport roller. A feeding device in which a guide region is formed. A feeding cassette including a placement section on which a plurality of ejection target media can be placed, and a one side guide portion that guides one side of the ejection medium;
A feed roller provided on the downstream side in the feeding direction of the feeding cassette and capable of rotating so that the medium to be ejected can be fed to the liquid ejecting head side, but rotation in the reverse direction is restricted;
A conveyance roller that is provided on the downstream side of the feeding roller and is rotatable in the feeding direction of the ejected medium and in the opposite direction;
After the front end of the ejected medium is slightly fed in the feeding direction by the transport roller, the transport roller is reversed until the front end of the ejected medium is parallel to the axis of the transport roller, and then the transport roller is ejected again. A control device that controls to rotate in the medium feeding direction,
The feeding roller is provided near the one side guide part, and the one side guide part can guide the rear end of the jetted medium when the tip of the jetted medium reaches the transport roller. A feeding device in which a guide region is formed.   A liquid ejecting apparatus comprising the feeding device according to claim 1. A feeding cassette provided with one side guide part for guiding one side of the recording medium;
A feed roller provided on the downstream side of the feed direction of the feed cassette and capable of feeding the recording medium so that the recording medium can be fed;
A downstream side of the feed roller, and a transport roller that is rotatable in the feeding direction of the recording medium and in the opposite direction;
The feeding roller is provided near the one side guide part, and the one side guide part can guide a rear end of the recording medium when a leading end of the recording medium reaches the transport roller. A method of feeding a recording medium by a feeding device in which a guide area is formed,
A step of guiding the recording medium to one side guide portion and feeding the recording medium by the feeding roller;
Skewing the recording medium to the opposite side of the one side guide portion by driving the feeding roller;
After feeding the recording medium to a position where the leading edge of the recording medium is slightly fed out in the feeding direction by the conveying roller, the conveying roller is reversed while the rotational driving of the feeding roller is stopped. A step of releasing the engagement state of the leading end of the recording medium with the conveying roller, and setting one side of the recording medium away from the one side guide part;
A method of feeding the recording medium by rotating the feeding roller and the conveying roller in the feeding direction again. A feeding cassette provided with one side guide portion for guiding one side of the ejection medium;
A feeding roller that is provided downstream of the feeding cassette in the feeding direction and is rotatable so that the medium to be ejected can be fed, but whose rotation in the reverse direction is restricted;
A transport roller provided on the downstream side of the feed roller and rotatable in the feed direction of the ejection target medium and in the opposite direction;
The feeding roller is provided near the one side guide part, and the one side guide part can guide the rear end of the jetted medium when the tip of the jetted medium reaches the transport roller. A method of feeding an ejected medium by a feeding device in which a guide region is formed,
A step of guiding the ejected medium to the one side guide part and feeding by the feeding roller;
Skewing the ejected medium to the opposite side of the one side guide portion by driving the feeding roller;
After feeding the ejected medium to a position where the tip of the ejected medium is slightly fed out in the feeding direction by the transport roller, the transport roller is reversed while the rotational driving of the feed roller is stopped. Releasing the engaged state of the tip of the ejected medium to the conveying roller, and setting one side of the ejected medium away from the one side guide part;
And a step of feeding the ejected medium by rotating the feeding roller and the conveying roller again in the feeding direction. A feeding cassette provided with one side guide part for guiding one side of the recording medium;
A feed roller provided on the downstream side of the feed direction of the feed cassette and capable of feeding the recording medium so that the recording medium can be fed;
A downstream side of the feed roller, and a transport roller that is rotatable in the feeding direction of the recording medium and in the opposite direction;
The feeding roller is provided near the one side guide part, and the one side guide part can guide a rear end of the recording medium when a leading end of the recording medium reaches the transport roller. A method of feeding a recording medium by a feeding device in which a guide area is formed,
A step of guiding the recording medium to one side guide portion and feeding the recording medium by the feeding roller;
Skewing the recording medium to the opposite side of the one side guide portion by driving the feeding roller;
After feeding the recording medium to a position where the leading edge of the recording medium is slightly fed out in the feeding direction by the conveying roller, the conveying roller is reversed while the rotational driving of the feeding roller is stopped. The recording medium is returned to the side opposite to the feeding direction until the leading end of the recording medium is parallel to the axis of the conveying roller, and one side of the recording medium is separated from the one side guide part; And a process of
A method of feeding the recording medium by rotating the feeding roller and the conveying roller in the feeding direction again. A feeding cassette provided with one side guide portion for guiding one side of the ejection medium;
A feeding roller that is provided downstream of the feeding cassette in the feeding direction and is rotatable so that the medium to be ejected can be fed, but whose rotation in the reverse direction is restricted;
A transport roller provided on the downstream side of the feed roller and rotatable in the feed direction of the ejection target medium and in the opposite direction;
The feeding roller is provided near the one side guide part, and the one side guide part can guide the rear end of the jetted medium when the tip of the jetted medium reaches the transport roller. A method of feeding an ejected medium by a feeding device in which a guide region is formed,
A step of guiding the medium to be ejected to one side guide part and feeding by the feeding roller;
Skewing the ejected medium to the opposite side of the one side guide portion by driving the feeding roller;
After feeding the ejected medium to a position where the tip of the ejected medium is slightly fed out in the feeding direction by the transport roller, the transport roller is reversed while the rotational driving of the feed roller is stopped. The ejected medium is returned to the side opposite to the feeding direction until the tip of the ejected medium is parallel to the axis of the transport roller, and one side of the ejected medium is separated from the one side guide part; And a process of
And a step of feeding the ejected medium by rotating the feeding roller and the conveying roller again in the feeding direction.

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