JP4868156B2 - Recording medium feeding apparatus, recording apparatus, and liquid ejecting apparatus - Google Patents

Description

  The present invention relates to a recording medium feeding device that feeds a plurality of recording media supported in a stacked state one by one from the top, and a recording apparatus including the recording medium feeding device. The present invention also relates to a liquid ejecting apparatus.

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 discharges ink from the recording head to perform recording on a recording medium. And a device that ejects a liquid corresponding to the application from a liquid ejecting head corresponding to the ink jet 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, and an electrode material (conductive paste) used for forming an electrode such as an organic EL display or a surface emitting display (FED) Examples thereof include an ejection head, a bioorganic matter ejection head used for biochip production, and a sample ejection head as a precision pipette.

  An ink jet printer as an example of a recording apparatus or a liquid ejecting apparatus is provided with a feeding device (ASF) capable of setting a plurality of sheets as recording media. The feeding device, for example, switches between a feeding roller that feeds paper downstream by rotating in contact with the paper, and a posture that supports the paper and presses the supported paper against the feeding roller, and a posture that separates the paper. It is equipped with a hopper that can be used, and a return lever that returns the paper that is about to be double fed during feeding to the upstream side, and feeds multiple sheets supported by the hopper in a stacked state one by one from the top. To send.

  Patent Documents 1 and 2 describe a configuration example of a feeding device having such a configuration. In the sheet feeding device described in Patent Literature 1, the return lever itself or the return lever tip is pushed by the sheet material being fed, so that the amount of penetration of the lever tip into the sheet material conveyance path is increased. Is configured to be small. That is, when feeding a sheet material with weak waist, the amount of penetration into the sheet material conveyance path at the lever tip becomes large, and when feeding a sheet material with strong waist, the sheet material conveyance path at the lever tip is fed. The intrusion amount is configured to be small. According to such a configuration, an effect is exerted on a problem such as imparting scratches to the back surface of the sheet material being conveyed due to the lever tip greatly entering the sheet material conveyance path.

The recording medium return device described in Patent Document 2 is configured such that the tip of the return lever retracts to substantially the same surface as the peripheral surface of the feeding roller due to the presence of the recording medium. According to this, since the recording medium is maintained in a flat state without being uneven, the recording medium is fed to the recording process, so that high quality recording can be realized.
JP 2003-26349 A JP 2005-41627 A

  However, in the sheet feeding device described in Patent Document 1, the tip of the lever can be retracted from the sheet feeding path even during the returning operation of the sheet material. If the sheet material is largely retracted from the feeding path, there is a possibility that the sheet material to be double fed may not be properly returned, especially when the sheet material being fed is strong. It becomes. Such a situation is the same in the recording apparatus described in Patent Document 2.

  Therefore, the present invention has been made in view of such a situation, and the problem is that the paper to be double-fed is reliably returned to the upstream side, and the return lever tip damages the back side of the paper being fed. An object of the present invention is to provide a feeding device that can prevent this from happening.

One aspect of the present invention for solving the above-described problems includes a feeding roller that feeds a recording medium by contacting and rotating the recording medium, and an uppermost recording medium to be fed. Separating members for separating the recording medium from the next and subsequent recording media, a pressure contact posture for supporting the recording medium in an inclined posture and pressing the supported recording medium against the feeding roller, and a separating posture for separating the recording medium from the feeding roller A hopper that is provided so as to be able to take the tip, a tip contact surface that is provided at a position facing the tip of the hopper and that supports the tip of the recording medium supported by the hopper from below, and a feeding path for the recording medium And a recording medium return lever that returns the leading edge of the recording medium after the next position to the upstream side by rotating to take a standby attitude that rises upstream from the retracted position that opens the recording medium. Leva The tip of the recording medium return lever is configured to be displaceable in the direction of retreating from the feeding path, and while the recording medium return lever is switched from the retracted position to the standby position, When the recording medium return lever passes through the nip point between the feeding roller and the separating member as viewed from the side of the feeding path, the recording medium return lever is placed in a restricted state so as not to be displaced in the direction of retreating from the feeding path. After the recording medium return lever passes through the nip point, a displacement operation in a direction of retreating from the feeding path is performed in a state where the leading end of the recording medium after the next position is returned to the leading end support surface. The recording medium feeding device is placed in an allowable state.
In order to solve the above-described problem, the first aspect of the present invention includes a feeding roller that feeds a recording medium by contacting and rotating the recording medium, and an uppermost sheet to be fed. By rotating the separating member that separates the recording medium and the recording medium after the next position, and the standby position that rises upstream from the retracted position that opens the feeding path of the recording medium, the second and subsequent positions The recording medium return lever for returning the recording medium front end to the upstream side, the rotating shaft of the recording medium return lever, and the rotating shaft provided on the rotating shaft and receiving power from the driving means A power transmission member that rotates the boss, a pivot shaft, or a boss portion provided at a pivot center position of the pivot shaft and the power transmission member, and a long groove into which the boss portion is loosely inserted. A frame member having a front When the boss portion is displaced in the long groove, the recording medium return lever, the rotation shaft, and the power transmission member are integrated and can be displaced in a direction of retreating from the feeding path. Displacement amount for changing the amount by which the tip of the recording medium return lever can be displaced according to the rotation angle of the recording medium return lever while the recording medium return lever switches from the retracted position to the standby position An adjusting means is provided.

  According to this aspect, the tip of the recording medium return lever can be displaced so that the tip of the recording medium return lever hardly displaces or stays in a slight displacement amount during execution of the return operation of the recording medium about to be double fed. By adjusting the amount, it is possible to reliably return the recording medium that is about to be fed without the tip of the recording medium return lever losing the waist of the recording medium being fed.

  Then, even when the recording medium return operation is completed, or even if it is not completed, the recording medium is sufficiently returned to the upstream side, and the recording medium return lever tip is temporarily retracted from the feeding path. When the position of the recording medium return lever is switched to the stage where the recording medium about to be double fed does not advance to the downstream side again, the amount by which the tip can be displaced is adjusted so that the tip is largely displaced. Accordingly, it is possible to prevent the tip from being attached to the back surface of the recording medium being fed.

  In particular, when the configuration of this aspect is not applied, when the leading end protrudes into the recording medium feeding path when the feeding roller does not have a substantially D shape when viewed from the side but is a perfect circular roller. The recording medium being fed is strongly in contact with the tip, and the recording medium being fed is likely to be scratched, but by applying the configuration of this aspect, while preventing such problems, The next and subsequent recording media that are about to be double fed can be reliably returned to the upstream side.

  Further, according to this aspect, there is provided a rotating shaft of the recording medium return lever, a power transmission member that is provided on the rotating shaft and rotates the rotating shaft by receiving power from a driving unit, and the rotating shaft. In the dynamic shaft or the power transmission member, the boss includes: a boss portion provided at a rotational center position of the rotational shaft and the power transmission member; and a frame member having a long groove into which the boss portion is loosely inserted. When the portion is displaced in the long groove, the rotating shaft and the power transmission member are integrated, and the tip of the recording medium return lever is displaced in a direction of retreating from the feeding path. .

  When the power transmission member that rotates the rotation shaft of the recording medium return lever is configured such that the rotation shaft slides, the power transmission member needs to transmit torque to the rotation shaft. For a certain relationship, it is necessary to displace the shaft while making contact with the power transmission member, for example, in surface contact with the power transmission member. As a result, when the recording medium return lever tends to rotate with respect to the power transmission member, a strong frictional force is generated on the sliding surface between the power transmission member and the rotating shaft, and the recording medium return lever is generated. There is a risk of hindering smooth displacement of the lever.

  Therefore, in this aspect, the boss portion provided on the rotation shaft of the recording medium return lever or the power transmission member that rotates the rotation shaft displaces in the long groove provided on the frame member, Since the rotation shaft and the power transmission member are integrally displaced, no strong frictional force is generated as described above, and a smooth displacement operation of the recording medium return lever can be ensured.

  According to a second aspect of the present invention, a feeding roller that feeds a recording medium by contacting and rotating the recording medium, an uppermost recording medium to be fed, and subsequent recording media A separating member that separates the recording medium from each other, a pressure contact posture that supports the recording medium in an inclined posture and presses the supported recording medium against the feeding roller, and a separation posture that separates the recording medium from the feeding roller. A hopper, a tip contact surface that is provided at a position facing the tip of the hopper, and supports the tip of the recording medium supported by the hopper from below, and a retracted posture that opens the feeding path of the recording medium, By rotating so as to take a stand-by posture that rises upstream, a recording medium return lever that returns the leading end of the recording medium after the next position to the upstream side, a rotation shaft of the recording medium return lever, and the rotation Provided on the shaft A power transmission member that rotates the rotation shaft by receiving power from a driving unit; and the rotation shaft, or the power transmission member, provided at a rotation center position of the rotation shaft and the power transmission member. And a frame member having a long groove into which the boss part is loosely inserted, and the boss part is displaced in the long groove, whereby the recording medium return lever, the rotating shaft, and the power transmission While the members are integrated, the tip of the recording medium return lever can be displaced in the direction of retreating from the feeding path, and while the recording medium return lever is switched from the retracted position to the standby position, The front end of the recording medium return lever changes in a direction to retract from the feeding path until the recording medium return lever passes the nip point when the feeding path is viewed from the side. After the recording medium return lever passes through the nip point, the recording medium return lever is retracted from the feeding path in a state where the leading edge of the recording medium after the next position is returned to the leading end support surface. It is characterized in that it is placed in a state where displacement movement in the direction to be allowed is allowed.

  According to this aspect, while the recording medium return lever is switched from the retracted position to the separated position, the tip of the recording medium return lever is not displaced until it passes through the nip point between the feeding roller and the separating member. The recording medium about to be double fed can be reliably returned without the recording medium return lever losing the waist of the recording medium being fed.

  After the recording medium return lever passes through the nip point, the leading end of the recording medium after the next position is returned to the leading end support surface, and the leading end is retracted from the feeding path. Since the displacement operation is allowed, the tip of the recording medium return lever can prevent the scratches from being attached to the back surface of the recording medium being fed.

  Further, according to this aspect, there is provided a rotating shaft of the recording medium return lever, a power transmission member that is provided on the rotating shaft and rotates the rotating shaft by receiving power from a driving unit, and the rotating shaft. In the dynamic shaft or the power transmission member, the boss includes: a boss portion provided at a rotational center position of the rotational shaft and the power transmission member; and a frame member having a long groove into which the boss portion is loosely inserted. Since the portion is displaced in the long groove, the rotation shaft and the power transmission member are integrated, and the tip of the recording medium return lever is displaced in the direction of retreating from the feeding path. As in the case of, smooth movement of the recording medium return lever can be ensured.

  According to a third aspect of the present invention, in the recording medium feeding device according to the first or second aspect, the driving unit includes a cam member that engages with the power transmission member. The long groove is formed so that the posture of the recording medium return lever is maintained when the recording medium return lever is displaced in a direction of retreating from the feeding path while being engaged with a power transmission member. It is characterized by being. According to this aspect, since the posture of the recording medium return lever is maintained when the recording medium return lever is displaced in the direction of retreating from the feeding path, the displacement operation of the recording medium return lever is performed in a series. Does not adversely affect the recording medium return operation.

  According to a fourth aspect of the present invention, in the recording medium feeding device according to any one of the first to third aspects, a plurality of the recording medium return levers are provided in the width direction of the recording medium, A recording medium restricting portion for restricting the displacement of the recording medium in a direction away from the recording medium return lever is provided at a position facing the recording medium return lever as viewed from the side of the medium feeding path. Among the plurality of recording medium return levers, the recording medium return lever located at a place where the influence of the restriction of the recording medium by at least the recording medium restricting portion is the smallest has a displacement amount at the time of the displacement. The present invention is characterized in that it is configured so as to be smaller than the displacement amount of the other recording medium return lever or not to be displaced.

  At a position facing the recording medium return lever as viewed from the side of the feeding path, a recording medium restricting portion for restricting the displacement of the recording medium in a direction away from the recording medium return lever is provided. The function of the recording medium regulating unit is realized by, for example, the feeding roller. However, the recording medium return lever located at the place where the influence of the restriction of the recording medium by the recording medium restricting portion is the smallest cannot reliably catch the leading edge of the recording medium during the returning operation. There is a possibility that the leading edge of the recording medium escapes from the leading edge of the recording medium return lever and cannot be returned to the upstream side.

  However, according to this aspect, the recording medium return lever provided at such a position does not displace so that the displacement amount at the time of the displacement is smaller than the displacement amounts of the other recording medium return levers. Thus, the leading end of the recording medium can be prevented from escaping from the leading end of the recording medium return lever.

  According to a fifth aspect of the present invention, there is provided a recording apparatus comprising recording means for recording on a recording medium, comprising the recording medium feeding apparatus according to any one of the first to fourth aspects. It is characterized by. According to this aspect, in the recording apparatus, the operational effects of any of the first to fourth aspects can be obtained.

  According to a sixth aspect of the present invention, there is provided a liquid ejecting apparatus comprising: a liquid ejecting unit that ejects a liquid onto an ejected medium; and an ejected medium feeding apparatus that feeds the ejected medium. The medium feeding device separates a feeding roller that feeds the ejected medium by contacting and rotating the ejected medium, and an uppermost ejected medium to be fed and subsequent ejected media. The ejected medium that returns the leading end of the ejected medium after the next position to the upstream side by rotating so as to take a standby attitude that rises upstream from the retracted attitude that opens the feeding path of the ejected medium A return lever, a rotation shaft of the ejected medium return lever, a power transmission member provided on the rotation shaft to rotate the rotation shaft by receiving power from a driving means, and the rotation shaft Or in the power transmission member, the rotating shaft and the A boss portion provided at a rotation center position of the force transmission member, and a frame member having a long groove into which the boss portion is loosely inserted, and the boss portion is displaced in the long groove, whereby the rotation shaft and The power transmission member is integrated so that the tip of the ejected medium return lever can be displaced in the direction of retracting from the feeding path, and the tip of the ejected medium return lever can be displaced during the change from the retracted posture to the standby posture. Displacement amount adjusting means for changing a proper amount according to the rotation angle of the ejected medium return lever is provided.

  According to a seventh aspect of the present invention, there is provided a liquid ejecting apparatus comprising: a liquid ejecting unit that ejects a liquid onto an ejected medium; and an ejected medium feeding device that feeds the ejected medium. The medium feeding device separates a feeding roller that feeds the ejected medium by contacting and rotating the ejected medium, and an uppermost ejected medium to be fed and subsequent ejected media. The ejected medium that returns the leading end of the ejected medium after the next position to the upstream side by rotating so as to take a standby attitude that rises upstream from the retracted attitude that opens the feeding path of the ejected medium A return lever, a rotation shaft of the recording medium return lever, a power transmission member provided on the rotation shaft and rotating the rotation shaft by receiving power from a driving means; and the rotation shaft Or in the power transmission member, the rotating shaft and the A boss portion provided at a rotation center position of the force transmission member, and a frame member having a long groove into which the boss portion is loosely inserted, and the boss portion is displaced in the long groove, whereby the rotation shaft and The power transmission member is integrated, and the tip of the recording medium return lever can be displaced in the direction of retreating from the feeding path, and the medium to be ejected is changed from the retracted position to the standby position. The tip of the return lever is placed in a restricted state so that it does not displace in the direction of retreating from the feeding path until the ejected medium return lever passes through the nip point when the feeding path is viewed from the side. After the ejection medium return lever passes through the nip point, a displacement operation in the direction of retreating from the feeding path is allowed with the leading end of the ejection medium after the next position being returned to the leading end support surface. Characterized in that it is placed in a state.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of an apparatus main body (with an outer cover removed) of an ink jet printer (hereinafter referred to as “printer”) 1 which is an embodiment of a “recording apparatus” or a “liquid ejecting apparatus” according to the present invention. 2 is a schematic side sectional view.
3A and 3B are perspective views showing the mounting structure of the holder 18 that pivotally supports the retard roller 13, FIG. 4 is a perspective view showing the cam mechanism that drives the return lever 19, and FIG. (B) is a perspective view showing the support structure of the rotating shaft 20 of the return lever 19, FIG. 6 is a perspective view of the restricting portion 60, and FIG. 7 is a side view of the feeding roller 11, the retard roller 13, and the return lever 19. 8A to 8D are side views of the feed roller 11, the retard roller 13, and the return lever 19 (each component is shown in a simplified manner). The movement of the lever 19 is shown.

  The overall configuration of the printer 1 will be outlined below with reference to FIGS. 1 and 2. The printer 1 includes a rear feeding device 2 according to the present invention as a first feeding unit at the rear part of the device, and a front feeding device 3 as a second feeding unit at the bottom of the device, and these two feeding devices. Then, a recording sheet (mainly cut sheet paper: hereinafter referred to as “sheet P”) as “recording medium” or “ejection medium” is fed to the conveying means 5. The paper P is conveyed to the recording means 4 (recording head 48) by the conveying means 5, and after recording is performed, the paper P is discharged to the stacker 61 by the discharging means 6.

Hereinafter, the components on the paper transport path will be described in more detail.
The rear feeding device 2 includes a frame 10 constituting a base of the device, a hopper 12, a feeding roller 11, a retard roller 13, a return lever 19, a paper support 24, a movable edge guide 17, and a fixed edge. And a guide 16.

  The hopper 12 is formed of a plate-like body, and is provided so as to be able to swing around an upper swing fulcrum 12a. By swinging, the paper P supported in an inclined posture on the hopper 12 is pressed against the feeding roller 11. The pressure contact posture to be switched and the separation posture to be separated from the feeding roller 11 are switched. The feeding roller 11 has a circular shape and rotates to feed the uppermost sheet P in pressure contact to the downstream side.

  A front end abutting surface 10 a against which the front end of the paper P set on the hopper 12 abuts is provided at a position facing the lower end of the hopper 12, and the front end of the set paper P is brought into contact with the front end as the hopper 12 swings. The slidable contact with the contact surface 10a is performed with respect to the feeding roller 11. Further, a guide surface 10b is provided on the surface facing the feeding roller 11, and the paper P whose leading end is out of the front end contact surface 10a advances downstream while being guided by the guide surface 10b.

  The retard roller 13 as a “separating member” has an outer periphery formed of an elastic material and is provided so as to be able to come into pressure contact with the feeding roller 11 and is provided in a state where a predetermined rotational resistance is given by a torque limiter mechanism. ing. Accordingly, when only one sheet is fed without the double feeding of the paper P, the retard roller 13 is driven to rotate with respect to the feeding roller 11, and the paper P is fed with the feeding roller 11 and the retard roller 13. When there are a plurality of sheets, the sheet P is stopped without rotating due to the sliding action between the sheets, and the next and subsequent sheets P are prevented from being double-fed.

  As shown in FIG. 3, the retard roller 13 is pivotally supported by a holder 18, and this holder 18 is provided in the frame 10 constituting the base of the rear feeding device 2 so as to be able to advance and retreat with respect to the feeding roller 11. The retard roller 13 is pressed against the feed roller 11 by the biasing force of the spring 9 to form a nip point between the two rollers. It is like that.

  On the other hand, the holder 18 is formed with protrusions 18a and 18a that can be engaged with the lower end of the hopper 12, and when the hopper 12 is switched from the pressure contact position of FIG. 3A to the separated position of FIG. When the protrusions 18 a and 18 a are pushed down by the hopper 12, the retard roller 13 is configured to be separated from the feeding roller 11. That is, the holder 18 is provided so as to be directly engageable with the hopper 12, and the retard roller 13 moves forward and backward with respect to the feeding roller 11 in conjunction with the swinging motion of the hopper 12.

  Returning to FIG. 2, the return lever 19 has a substantially “<” shape when viewed from the side. The return lever 19 is provided so as to be rotatable about the rotation shaft 20 as viewed from the side of the sheet feeding path. By moving, the leading edge of the next and subsequent sheets P to be double-fed along with the uppermost sheet P to be fed is returned to the upstream side, that is, the leading edge support surface 10a. The return lever 19 will be described in detail later.

  The paper support 24 supports the rear end of the paper P by extending the paper support surface of the hopper 12 toward the rear end of the paper P, and the movable edge guide 17 and the fixed edge guide 16 face each other in the hopper 12. It is provided and contacts the edge of the paper P to regulate the position of the edge. The movable edge guide 17 is provided in the hopper 12 so as to be displaceable (slidable) in the width direction of the paper P, so that it can be displaced to an appropriate position suitable for the width dimension of the paper P.

On the other hand, the front feeding device 3 provided at the bottom of the printer 1 and configured to set paper from the front of the device includes a paper feeding cassette 25, a pickup roller 26, a feeding roller 28, a separation roller 29, An assist roller 30.
A plurality of sheets of paper P can be set in a stacked state in a paper feed cassette 25 that can be mounted and removed from the front side of the apparatus, and a pickup roller 26 that is rotated by a motor (not shown) is set in the paper feed cassette 25. By rotating in contact with the uppermost one of the sheets P, the uppermost sheet P is fed out from the sheet feeding cassette 25. The feeding roller 28 is rotationally driven by a motor (not shown), reverses the uppermost sheet P fed from the sheet feeding cassette 25, and feeds it to the conveyance driving roller 41 and the conveyance driven roller 42 after the paper guidance 44. To send.

  A separation roller 29 is provided at a position facing the outer peripheral surface of the feeding roller 28 so as to be able to advance and retreat with respect to the feeding roller 28. When the uppermost sheet P is fed out from the sheet feeding cassette 25, By forming a nip point in pressure contact with the feeding roller 28, the leading edge of the next and subsequent sheets P fed from the sheet feeding cassette 25 connected to the uppermost sheet P to be fed is positioned near the nip point. Keep on. That is, the uppermost sheet P and the subsequent sheet P are separated to prevent double feeding of the sheet P.

The assist roller 30 is provided so as to be in contact with the outer peripheral surface of the feeding roller 28, and the paper P is fed with the rotation of the feeding roller 28 by nipping the paper P with the feeding roller 28. Assist.
Next, on the downstream side of the rear feeding device 2 and the front feeding device 3, paper detection means (not shown) for detecting the passage of the paper P, and the paper P fed from the rear feeding device 2 are provided. A guide roller 40 that forms a feeding posture and a paper guiding post 44 that guides the fed paper P to the transporting unit 5 are provided.

  The transport means 5 includes a transport drive roller 41 that is rotationally driven by a motor, and a transport driven roller 42 that is pivotally supported by the paper guide upper 43 so as to be driven to rotate while being pressed against the transport drive roller 41. Yes. The paper P that has reached the transport means 5 is transported to the recording means 4 (recording head 48) on the downstream side when the transport drive roller 41 rotates while being nipped by the transport drive roller 41 and the transport driven roller 42. Is done.

  The recording head 48 is provided at the bottom of the carriage 46. The carriage 46 is reciprocated in the main scanning direction by a drive motor (not shown) while being guided by a carriage guide shaft 47 extending in the main scanning direction (the front and back direction in FIG. 2). It is driven like this. The carriage 46 is equipped with independent ink cartridges (not shown) for a plurality of colors, and ink is supplied from the ink cartridges to the recording head 48.

A paper guide lower 45 is provided at a position facing the recording head 48, and the distance between the paper P and the recording head 48 is defined by the paper guide lower 45.
Subsequently, on the downstream side of the recording unit 4, an auxiliary roller 57 that prevents the sheet P from being lifted from the lower sheet guide 45 and a discharge unit 6 that discharges the recorded sheet P are provided. The discharge means 6 includes a discharge drive roller 55 that is rotationally driven by a motor (not shown), and a discharge driven roller 56 that rotates in contact with the discharge drive roller 55.

  The discharge driven roller 56 is formed by a toothed roller having a plurality of teeth on the outer periphery, and a plurality of discharge driven rollers 56 are provided on the discharge frame Assy 54 having a long shape in the main scanning direction so as to correspond to the plurality of discharge driving rollers 56. The paper P recorded by the recording means 4 is rotated by the discharge drive roller 55 while being nipped by the discharge drive roller 55 and the discharge driven roller 56, whereby the stacker 61 provided on the front side of the apparatus. Is discharged.

The above is the outline of the printer 1, and the return lever 19 will be described in detail with reference to FIGS. 3 to 8.
In FIG. 7, the return lever 19 is provided so as to be rotatable with the rotation shaft 20 as the rotation center as seen from the side, as viewed from the side of the sheet feeding path. Further, the nip point between the feeding roller 11 and the retard roller 13 is included inside the rotation locus drawn by the tip 19a during the rotation. In the normal standby state, the return lever 19 takes a posture that rises most upstream (the posture shown in FIG. 8A: hereinafter referred to as “standby posture”). Therefore, in this standby posture, the set paper P moves downstream. It does n’t progress.

  When the feeding operation is started from this state, it immediately takes the posture of falling to the most downstream side and opening the paper feeding path (posture shown in FIG. 8B: hereinafter referred to as “retracting posture”). By rotating from the posture in a direction to return to the standby posture, the next and subsequent sheets about to be double fed are returned to the leading edge support surface 10a.

  Such a rotation operation of the return lever 19 is performed in conjunction with the rotation operation of the feeding roller 11. As shown in FIG. 4, the rotation shaft 11 a of the feed roller 11 is provided with a cam 22, and the rotation shaft 20 of the return lever 19 is a “power transmission member” that engages with the cam 22. A cam follower 23 is provided. Therefore, when the cam 22 and the cam follower 23 are engaged, the return lever 19 rotates as described above.

  Here, as shown in FIG. 5A, the cam follower 23 is formed with a long groove 23a extending in a direction orthogonal to the rotation axis direction of the rotation shaft 20, while a part of the rotation shaft 20 ( The shaft end portion is formed with a notch 20a in which a part of the rotating shaft 20 is notched when viewed in the axial direction. The notch 20a is loosely inserted into the long groove 23a as shown in FIG. 5 (B), so that the rotating shaft 20 is rotated relative to the cam follower 23 as shown by the arrow in FIG. 5 (B). It becomes possible to displace in the direction orthogonal to the axial direction. Further, the cam follower 23 rotates the rotating shaft 20 with the rotation of the cam follower 23 while allowing the displacement operation of the rotating shaft 20 as is apparent from the drawing.

  In a state where the cam follower 23 is supported by the frame 10 constituting the base body of the rear feeding device 2, there is a restriction portion 60 (displacement amount adjusting means) around the notch portion 20a as shown in FIGS. ) Is arranged. The restricting portion 60 restricts the position of the cutout portion 20a, that is, the rotation shaft 20 with respect to the sheet feeding path. The restriction portion 60 has the notch portion 20a dropped when the rotation shaft 20 is viewed in the axial direction. A recess 61 that allows the Note that reference numeral 21 in FIG. 6 denotes a coil spring that biases the rotating shaft 20 (return lever 19) toward the feeding path.

  The recess 61 allows the notch 20a, that is, the tip 19a of the return lever 19 to move in a direction away from the paper feeding path when the return lever 19 takes a predetermined posture. The leading edge 19a is separated from the paper feeding path by receiving a force from the paper P being fed.

  FIG. 8 shows this, and FIG. 8A shows the feeding standby state (the standby posture of the return lever 19) as described above. In this state, the notch portion 20a is desired to be in the opening of the recess 61, so that it can fall into the recess 61. However, in this state, the tip portion 19a does not receive a force from the paper P, so the notch portion 20a The tip 19a of the return lever 19 does not fall into the dent 61 and is in a state of largely protruding upward from the tip support surface 10a.

  When the feeding operation is started from this state, as shown in FIG. 8B, the return lever 19 falls to the most downstream side and assumes a retracted position, thereby opening the sheet feeding path. In this state, the notch 20a is not opposed to the opening of the recess 61, and the downward drop is restricted by the restricting part 60, that is, the displacement operation of the tip 19a of the return lever 19 is restricted.

  8C until the return lever 19 passes through the nip point between the feed roller 11 and the retard roller 13 in the process in which the return lever 19 rises upstream in order to perform the paper returning operation from this state. In this way, the restriction portion 60 continues to restrict the downward depression of the cutout portion 20a, that is, the displacement operation of the tip 19a of the return lever 19 is restricted. FIG. 8C shows a state where the return lever 19 passes through the nip point between the feeding roller 11 and the retard roller 13.

  From this state, when the return lever 19 further pivots in the direction of rising upstream, the leading edge of the next and subsequent sheets that is about to be fed is returned to the leading edge support surface 10a. At this time, the notch 20a is in a state of facing the opening of the recess 61, that is, the tip 19a of the return lever 19 is allowed to move in a direction away from the paper feed path.

  In this state, the leading end 19a of the return lever 19 receives a downward force from the paper P being fed, so that the notch 20a falls into the recess 61 as shown in FIG. The tip 19a of the lever 19 is retracted from the paper feed path. In FIG. 8D, the tip of the return lever 19 indicated by an imaginary line together with reference numeral 19a 'indicates the position when the notch 20a does not fall into the recess 61.

  As described above, while the return lever 19 switches from the retracted position to the standby position, the tip 19a of the return lever 19 does not retract until the return lever 19 passes the nip point between the feeding roller 11 and the retard roller 13. Since it is regulated, it is possible to reliably return the paper to be double fed to the upstream side without losing the back of the paper P being fed.

  After the return lever 19 passes through the nip point between the feeding roller 11 and the retard roller 13, the leading edge 19a is returned in a state where the leading edge of the next and subsequent sheets to be fed is returned to the leading edge support surface 10a. Is placed in a state in which displacement in the direction of retreating from the paper feeding path is allowed, the leading edge 19a is retracted from the paper feeding path by the force received from the paper P being fed and is being fed by the leading edge 19a. It is possible to prevent scratches from adhering to the back side of the paper.

  That is, the displacement amount adjusting means (the restricting portion 60 and the recess 61) changes the amount by which the tip 19a can be displaced while the return lever 19 switches from the retracted posture to the standby posture according to the rotation angle of the return lever 19. In the state where the return lever 19 does not lose the waist of the paper P being fed and wants to receive the paper P to be reliably fed, the tip 19a is prevented from being retracted, and the back surface of the paper is most damaged. In the state where the tip 19a is most advanced with respect to the feeding roller 11, the tip 19a can be largely retracted, so that it is possible to achieve both reliable sheet return and prevention of fouling.

In particular, if such a configuration is not applied, the feed roller 11 does not have a substantially D shape when viewed from the side, and the tip of the return lever 19 is not a perfect circular roller as in this embodiment. When 19a protrudes into the paper feeding path, the tip 19a of the lever 19 comes into strong contact with the paper being fed from below, and the paper being fed is likely to be damaged. However, by applying the above configuration, On the other hand, when the paper to be double fed is returned to the upstream side, it can be surely returned to the upstream side.
The amount of displacement of the return lever 19 can be easily adjusted by changing the shape of the restricting portion 60 and the amount of recess of the recess 61. Therefore, the displacement amount of the return lever 19 can be further finely adjusted according to the rotation angle of the return lever 19.

  Next, another embodiment will be described with reference to FIGS. 9 to 13. FIG. 9 is a schematic diagram showing the positional relationship of the main components of the rear feeding device 2 when viewed from the front, and FIGS. 10A and 10B show the phenomenon of the sheet riding on the return lever 19. FIG. 11A is a perspective view of the 80-digit side regulating portion, FIG. 11B is a perspective view of the 1-digit side regulating portion, and FIG. 12 is the state of FIG. FIG. 13 is a cross-sectional side view of a main part of the rear feeding device 2 for showing a difference in displacement amounts of a plurality of return levers.

  First, the phenomenon of the sheet climbing on the return lever 19 will be described with reference to FIGS. 9 and 10. A plurality of return levers 19 are provided at appropriate intervals in the paper width direction. In this embodiment, as shown in FIG. 9, three return levers 19 are provided. In FIG. 9, the one on the most digit side (the right side in the figure) is indicated by reference numeral 19A, and the most on the 80th digit side (the same figure). The left side) is indicated by reference numeral 19C, and the middle one is indicated by reference numeral 19B to distinguish them.

  On the other hand, as shown in FIG. 1, the feeding roller 11 is provided at a position deviated to the 1st digit side on the rotating shaft 11a extending in the paper width direction, and at a position slightly displaced from the center to the 80th digit side. An auxiliary roller 15 is provided. The reason why the feeding roller 11 is provided at a position deviated to the one digit side is to cope with all the sheets from the small sheet width to the large sheet width, and the auxiliary roller 15 is provided. This is because, in the case of a sheet having a large length, only the feeding roller 11 causes the bending posture at the time of feeding to be different between the 1st digit side and the 80th digit side, causing a path difference and causing a skew.

  Since the feeding roller 11 and the auxiliary roller 15 are provided at positions facing the return lever 19 when the feeding path is viewed from the side, the feeding roller 11 and the auxiliary roller 15 are separated from the return lever 19. It functions as a “recording medium regulating unit” that regulates the displacement of the sheet in the direction.

  However, the further away from the feeding roller 11 and the auxiliary roller 15 in the paper width direction, the smaller the influence of the restriction, so that the paper tends to be displaced (lifted) away from the return lever 19. Here, when the return lever 19 disposed in a place where the influence of the regulation is large performs the paper return operation, the paper can be returned to the upstream side as shown in FIG. However, when the return lever 19 performs the paper return operation in a place where the influence of the regulation is small as described above, and the tip 19a is displaced in the direction of retreating from the paper feed path (solid line in FIG. 8D), As shown in FIG. 10B, the lever tip 19a cannot reliably catch the leading edge of the sheet, and the leading end of the sheet escapes onto the lever leading end 19a, resulting in a riding state (hereinafter referred to as “riding phenomenon”). ").

  Therefore, in the present embodiment, the displacement amount of the return lever located at the place where the influence of the sheet regulation by the feeding roller 11 and the auxiliary roller 15 is the smallest among the plurality of return levers 19 is greater than the displacement amount of the other return levers. Is configured to be smaller. Specifically, in this embodiment, as shown in FIG. 9, the return levers 19 </ b> A and 19 </ b> B are provided at positions close to the feeding roller 11, and the return lever 19 </ b> B is affected by the regulation by the auxiliary roller 15. In the vicinity of these return levers, the paper is regulated relatively strictly. However, at the position of the return lever 19C, the influence of the restriction is smaller than the positions of the return levers 19A and 19B. Accordingly, the displacement amount of the return lever 19C is configured to be smaller than the displacement amounts of the return levers 19A and 19B.

  As a means for that purpose, as shown in FIG. 11A, a regulating portion 60B that regulates the position of the rotation shaft 20 with respect to the sheet feeding path on the 80th digit side is rotated regardless of the rotation angle of the return lever 19. The shaft 20 is formed so as not to be displaced (not displaced in the direction of retreating from the feeding path). Then, as shown in FIG. 11 (B), a restricting portion 60A for restricting the position of the rotary shaft 20 relative to the paper feeding path on the one digit side is provided on the return lever 19 in the same manner as the restricting portion 60 shown in FIG. According to the rotation angle, the rotation shaft 20 is formed so as to be displaceable in the direction of retreating from the feeding path.

  11B, the restricting portion 60A according to the present embodiment is different from the restricting portion 60 shown in FIG. 6 in that the rotating shaft 20 (return shaft 20) has a relatively wide range with respect to the rotation angle of the return lever 19. The lever 19) is formed to allow displacement.

  With the above configuration, the rotary shaft 20 can swing about the 80th digit side as a fulcrum (see FIG. 12), and the tip of the return lever 19C provided on the most 80th digit side returns to the 1st digit side. The amount of displacement is smaller than the tip of the lever 19A (see symbol d in FIG. 12 and FIG. 13). As a result, it is possible to prevent the phenomenon that the leading end of the sheet climbs on the return lever 19C.

  In the present embodiment, the displacement amount of the return lever 19C is configured to be smaller than the displacement amounts of the return levers 19A and 19B, but it may be configured not to be displaced at all. Further, in the present embodiment, a plurality of return levers are provided on one rotating shaft 20, but each return lever is configured to be independently displaceable so that it is displaced by an appropriate amount of displacement according to the arrangement location. It is also possible to configure.

  Next, still another embodiment will be described with reference to FIGS. 14 to 17. Here, FIG. 14 is a diagram showing a sliding structure of the rotating shaft 20 of the return lever 19 and relates to the above-described embodiment (hereinafter referred to as “first embodiment”) described with reference to FIGS. 4 and 5. The configuration is shown. 15 is a perspective view of the rotation shaft 20, the cam follower 71, and the lever member 72 of the return lever 19, FIG. 16 is a view showing a slide structure of the rotation shaft 20 of the return lever 19, and FIG. 70 is a perspective view showing the relationship between the boss 70 and the boss 73, and shows a configuration according to a modification of the first embodiment (hereinafter referred to as “second embodiment”). FIG. 17A is a perspective view showing the relationship between the frame 10 and the boss 23b, and shows the first embodiment.

  In the following, first, the first embodiment will be further described with reference to FIG. 14 in order to facilitate understanding of the configuration and operational effects of the second embodiment. A long groove 23 a is formed in the cam follower 23 as a “power transmission member”, and a notch 20 a formed at the shaft end of the rotating shaft 20 of the return lever 19 is loosely inserted into the long groove 23 a. As shown in FIG. 17A, the cam follower 23 is formed with a boss 23b. The boss 23b is pivotally supported by a bearing hole 10c formed in the frame 10, and a return lever is centered on the boss 23b. 19 (rotating shaft 20) rotates.

  With the above configuration, in the first embodiment, the notch 20a formed at the shaft end of the rotating shaft 20 is displaced in the long groove 23a, so that the rotating shaft 20 (return lever 19) is shown by an arrow in the drawing. It is displaced in the a direction. A return lever indicated by an imaginary line and reference numeral 19 ′ indicates a return lever retracted from the paper feeding path.

  Here, a coil spring (not shown) gives the return lever 19 an urging force to rotate the return lever 19 in the direction to tilt the downstream side, while the cam follower 23 is pressed against the cam 22 on the other side. Thus, the posture of the return lever 19 is restricted by the above configuration. Accordingly, since the notch portion 23a attempts to rotate inside the long groove 23a, the frictional force on the sliding surface between the long groove 23a and the notch portion 23a increases, and the return lever 19 can be smoothly retracted from the paper feed path. There is a risk of disappearing.

  It should be noted that the shaft end of the rotating shaft 20 is not a boss shape but a notch shape, and the surface contact with the long groove 23 a is configured when the rotating shaft 20 is slidably displaced with respect to the cam follower 23. In this case, the cam follower 23 needs to transmit the torque from the cam 22 to the rotation shaft 20, so that the rotation shaft 20 does not rotate with respect to the cam follower 23.

  Therefore, the second embodiment is configured as follows. As shown in FIGS. 15 and 16, a cam follower 71 is used instead of the cam follower 23 of the first embodiment. The cam follower 71 is not formed with a long groove and is fixedly attached to the shaft end of the rotating shaft 20. On the other hand, the cam follower 71 is formed with a return lever 19 (rotation shaft 20) and a boss 73 (see FIGS. 16 and 17B) that constitutes the rotation shaft (rotation center) of the cam follower 71. The boss 73 is loosely inserted into a long groove 70a formed in a frame 70 (corresponding to the frame 10 of the first embodiment) constituting the base body of the rear feeding device 2 as shown in FIG. As a result, the rotating shaft 20 and the cam follower 71 are integrally displaced with respect to the frame 70 as shown in FIG.

  As shown in FIG. 15, a lever member 72 is fixedly attached to the shaft end on the other side of the rotating shaft 20 in the same manner as the cam follower 71, and a boss 73 is similarly formed on the lever member 72. The frame 70 is loosely inserted into a long groove (not shown) formed in the frame 70. A coil spring 74 is engaged with the lever member 72, and the return lever 19 is biased by the coil spring 74 in a direction in which the lever 19 is tilted downstream. The frame 70 is provided with a coil spring that urges the rotating shaft 20 (return lever 19) toward the feeding path, similar to the coil spring 21 of FIG. 16 and 17B, reference numeral 75 denotes a restricting portion (displacement amount adjusting means) that changes the retractable amount of the return lever 19 (the rotation shaft 20) according to the rotation angle of the return lever 19. Is shown.

  Here, even if the return lever 19 is urged in the direction to fall downstream by the coil spring 74, the frictional force in the contact portion between the boss 73 and the long groove 70a is not affected in the long groove 70a of the frame 70. There is no adverse effect on the displacement operation of the boss 73 in the long groove 70a. Therefore, in the second embodiment, a smooth displacement operation of the rotation shaft 20 (return lever 19) can be ensured.

  In addition, as shown in FIG. 16, even if the cam 22 and the cam follower 71 are engaged and the return lever 19 and the cam follower 71 are displaced as indicated by reference numerals 19 ′ and 71 ′, respectively, the posture of the return lever 19 is maintained. The long groove 70a is extended so that the return lever 19 hardly rotates around the boss 73 or is slightly rotated even if it rotates. Therefore, even if the return lever 19 is displaced in the direction of retreating from the paper feed path, the return lever 19 can finally return to an appropriate standby posture without adversely affecting the series of paper return operations. It becomes.

FIG. 2 is a perspective view of a printer main body of the present invention. 1 is a schematic side sectional view of a printer according to the present invention. (A) (B) is a perspective view which shows the attachment structure of the holder which pivotally supports a retard roller. The perspective view which shows the cam mechanism which drives a return lever. (A) (B) is a perspective view which shows the support structure of the rotating shaft of a return lever. The perspective view of a control part. The side view of a feed roller, a retard roller, and a return lever. (A)-(D) are figures which show operation | movement transition of a return lever. The schematic diagram which shows the positional relationship of the main component of the apparatus at the time of seeing a rear feeding apparatus from a front direction. (A), (B) is a sectional side view of a rear feeding device. (A) is a perspective view of an 80-digit side regulating portion, and (B) is a perspective view of a 1-digit side regulating portion. The figure which shows the state which the rotating shaft of the return lever rock | fluctuated from the state of FIG. The principal part side sectional view of a rear feeding device. The figure which shows the slide structure of the rotating shaft of a return lever (1st Embodiment). The perspective view of the rotating shaft of a return lever, a cam follower, and a lever member. The figure which shows the slide structure of the rotating shaft of a return lever (2nd Embodiment). It is a perspective view which shows the relationship between a flame | frame and a boss | hub, (A) is 1st Embodiment, (B) is a figure which shows 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet printer, 2 Rear feeder, 3 Front feeder, 4 Recording means, 5 Conveyance means, 6 Discharge means, 10 Frame, 11 Feed roller, 12 Hopper, 13 Separation roller, 15 Auxiliary roller, 16 Fixed edge Guide, 17 Movable edge guide, 19 Return lever, 19a (Return lever) tip, 20 Rotating shaft, 22 Cam, 23 Cam follower, 24 Paper support, 25 Paper feed cassette, 26 Pickup roller, 28 Feed roller, 29 Separation Roller, 30 Assist roller, 40 Guide roller, 41 Transport drive roller, 42 Transport driven roller, 43 On paper guide, 44 After paper guide, 45 Under paper guide, 46 Carriage, 47 Carriage guide shaft, 48 Recording head, 54 Paper discharge Frame Assy, 55 Discharge drive roller, 5 6 discharge driven roller, 57 auxiliary roller, 61 stacker, 70 frame, 71 cam follower, 72 lever member, 73 boss part, 74 coil spring, 75 regulating part, P recording sheet

Claims (7)

A feeding roller that feeds the recording medium by contacting and rotating the recording medium;
A separation member that separates the uppermost recording medium to be fed from the subsequent recording medium;
A hopper provided to support a recording medium in an inclined posture and to be capable of taking a pressure contact posture in which the supported recording medium is pressed against the feeding roller and a separation posture in which the recording medium is separated from the feeding roller;
A tip contact surface provided at a position facing the tip of the hopper and supporting the tip of the recording medium supported by the hopper from below;
A recording medium return lever that returns the leading edge of the recording medium after the next position to the upstream side by rotating to take a standby position that rises upstream from the retracted position that opens the recording medium feeding path , Prepared,
Lever tip back before Symbol the recording medium, together with the displaceable configured in a direction retracting from the feed path,
While the recording medium return lever is switched from the retracted position to the standby position, the leading end of the recording medium return lever is seen from the feeding path so that the recording medium return lever is the feeding roller. Until it passes through the nip point between the recording member and the separation member, and is placed in a restricted state so as not to be displaced in the direction of retreating from the feeding path. In a state where the recording medium front end of the recording medium is returned to the front end support surface, the recording medium is placed in a state in which displacement operation in the direction of retreating from the feeding path is allowed.
A recording medium feeding device characterized by the above. The recording medium feeding device according to claim 1, wherein the recording medium return lever is pivoted.
A power transmission member provided on the pivot shaft and configured to pivot the pivot shaft by receiving power from a driving unit;
In the rotation shaft or the power transmission member, a boss portion provided at a rotation center position of the rotation shaft and the power transmission member;
A frame member having a long groove into which the boss part is loosely inserted,
When the boss portion is displaced in the long groove, the recording medium return lever, the rotating shaft, and the power transmission member are integrated, and the tip of the recording medium return lever is retracted from the feeding path. Can be displaced in the direction,
A recording medium feeding device characterized by the above. The recording medium feeding device according to claim 2 , wherein the driving unit includes a cam member that engages with the power transmission member.
The posture of the recording medium return lever is maintained when the recording medium return lever is displaced in a direction of retreating from the feeding path while the cam member and the power transmission member are engaged. A long groove is formed,
A recording medium feeding device characterized by the above. The recording medium feeding device according to any one of claims 1 to 3, wherein a plurality of the recording medium return levers are provided in a width direction of the recording medium,
A recording medium regulating unit that regulates displacement of the recording medium in a direction away from the recording medium return lever at a position facing the recording medium return lever as viewed from the feeding path of the recording medium. Is provided,
Among the plurality of recording medium return levers, the recording medium return lever located at a place where the influence of the restriction of the recording medium by at least the recording medium restricting portion is the smallest, It is configured to be smaller than the displacement amount of the recording medium return lever or not to be displaced.
A recording medium feeding device characterized by the above.   A recording apparatus comprising recording means for recording on a recording medium, the recording apparatus comprising the recording medium feeding apparatus according to claim 1. Liquid ejecting means for ejecting liquid onto the ejected medium;
An ejected medium feeding device for feeding an ejected medium, and a liquid ejecting apparatus comprising:
The ejected medium feeding device includes a feed roller that feeds the ejected medium by contacting and rotating the ejected medium;
A separation member that separates the uppermost ejected medium to be fed from the subsequent ejected medium;
From the retracted position to release the feed path of the injection medium, by turning to take a waiting posture get up on the upstream side, and the ejection target medium return lever for returning the ejection target medium tip of the next or subsequent to the upstream side, the Prepared,
Lever tip back before SL ejection target medium, with displaceable configured in a direction retracting from the feed path,
While the ejected medium return lever is switched from the retracted position to the standby position, the tip of the ejected medium return lever is viewed from the side of the feeding path, and the ejected medium return lever is moved to the feeding roller. Until it passes through the nip point between the separation member and the separation member, and is placed in a regulated state so as not to be displaced in the direction of retreating from the feeding path. In a state where the tip of the ejected medium is returned to the tip support surface, it is placed in a state in which a displacement operation in the direction of retreating from the feeding path is allowed.
A liquid ejecting apparatus. The liquid ejecting apparatus according to claim 6, wherein a rotation shaft of the ejected medium return lever;
A power transmission member provided on the pivot shaft and configured to pivot the pivot shaft by receiving power from a driving unit;
In the rotation shaft or the power transmission member, a boss portion provided at a rotation center position of the rotation shaft and the power transmission member;
A frame member having a long groove into which the boss part is loosely inserted,
When the boss portion is displaced in the long groove, the ejected medium return lever, the rotating shaft, and the power transmission member are integrated, and the ejected medium return lever tip is retracted from the feeding path. Can be displaced in the direction,
A liquid ejecting apparatus.

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