JP2006036483A - Image recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image recording device capable of improving feeding precision of a medium to be recorded in an image recording part and preventing reduction of quality of recording due to positional deviation of recording for the medium to be recorded. <P>SOLUTION: A plurality of nip rollers 51 are provided substantially along the direction of a driving shaft of a driving roller 50 below the driving roller 50, and each rotary shaft 53 of the plurality of nip rollers 51 is arranged so as to incline toward the downstream side in the direction of feeding for the driving shaft of the driving roller 50. A nip position N for the medium P to be recorded by the nip roller 51 and the driving roller 50 is positioned on an upper side and the upstream side in the direction of feeding for the lowermost end section S of the outer periphery of the driving roller 50. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image recording apparatus that feeds a recording medium to an image recording unit while being sandwiched between a driving roller and a nip roller.

  2. Description of the Related Art Conventionally, in an image recording apparatus such as a printer or a facsimile, a plurality of rollers are arranged in a conveyance path as a conveyance mechanism that conveys a recording medium such as paper. In general, each of the immediately upstream side and the immediately downstream side in the transport direction of an image recording unit for recording an image on a recording medium is provided with a set of rollers arranged to face each other so as to sandwich the recording medium, The image recording unit is configured to promptly feed and discharge paper.

  The roller set opposed to the immediately upstream side of the image recording apparatus is generally composed of a driving roller driven by a driving source and a nip roller that is urged toward and driven by the driving roller side. The drive shaft and the rotation shaft of the nip roller are arranged in parallel. For this reason, the recording medium is sandwiched between the driving roller and the nip roller by long line contact that continues along the width direction orthogonal to the feeding direction, and is reliably conveyed.

  However, in such a transport mechanism, when the trailing end of the recording medium comes out of the nipping by the driving roller and the nip roller on the feeding side, the strong nipping state continuously abutted by long line contact is released at a time. Therefore, the recording medium is excessively pushed out to the image recording portion side by the urging force applied to the nip roller, and the feed amount is changed. As a result, positional deviation occurs in recording in the image recording unit, and recording quality is impaired.

  In order to solve this problem, in Patent Document 1, a plurality of nip rollers (corresponding to the pinch roller in Patent Document 1) are provided above the driving roller (corresponding to the conveying roller in Patent Document 1), and the outer shape of the nip roller is tapered. The recording medium is sandwiched between the taper-shaped large-diameter portion and the driving roller so that the sandwiched state of the recording medium by the nip roller and the driving roller is not a line contact but a plurality of points. It is made to become the point contact comprised by.

Further, in Patent Document 1, two nip rollers are combined to form a roller set, and a first roller set in which the rotation axis of the nip roller has an inclination of θ with respect to the rotation axis of the drive roller, and the first roller The second roller sets in which the direction of inclination is set to be opposite to the set are alternately arranged along the axial direction of the drive roller. And the large diameter part of the said nip roller is formed in the both ends in each roller group, and the nipping point is mutually shifted in the feed direction. That is, in Patent Document 1, the timing at which the rear end portion of the recording medium is removed from between the driving roller and the nip roller is shifted, and the nipping of the rear end portion of the recording medium is gradually released, whereby the image recording unit The amount of transport to the car was not changed suddenly.
Japanese Patent Laid-Open No. 2002-226077 (see FIGS. 4A and 4B)

  However, as shown in FIG. 4B in Patent Document 1, the nip position with respect to the recording medium by the nip roller and the driving roller is lower than the uppermost end portion of the driving roller and downstream in the transport direction. Is located. Therefore, in the structure of Patent Document 1, the recording medium has its front end held between the roller sets on the downstream side of the image recording unit and conveyed on the conveyance path, and the rear end is the uppermost end portion of the driving roller. The nip position gradually deviates from the nip position. That is, the contact end position of the recording medium with respect to the nip roller and the driving roller coincides with the nip position, so that the rear end of the recording medium is immediately free from the nip position with the downward force. Therefore, it becomes easy to warp upward. If the trailing edge is warped upward, the flatness of the entire recording medium is impaired, and an equal gap is not formed between the recording medium and the recording head in the image recording unit, so that the recording quality is impaired. Is a problem.

  In Patent Document 1, the nip position between the large-diameter portion of the nip roller and the driving roller is shifted in the feeding direction, and the recording medium is aligned and fed on one edge side along the feeding direction. Yes. Therefore, when a recording medium having a non-standard size in the width direction is sandwiched, the nip position in the width direction of the recording medium is not symmetrical, and the contact start position of the nip roller and the driving roller with respect to the recording medium Further, since the nip position is shifted in the feeding direction, there is a possibility that the recording medium is conveyed while being inclined in the feeding direction.

  The present invention solves the above-described problems, and provides an image recording apparatus that has good recording medium feeding accuracy in an image recording unit and can prevent deterioration in recording quality due to misregistration of recording with respect to the recording medium. Is intended to provide.

  In order to achieve the above object, an image recording apparatus according to the first aspect of the present invention includes an image recording unit that records an image on a recording medium, and a feeding path that feeds the recording medium to the image recording unit. In the feeding path, in the image recording apparatus configured to feed a recording medium between a driving roller driven by a driving source and a nip roller driven by the driving roller, the nip roller Are provided below the drive roller and substantially along the direction of the drive shaft of the drive roller, and the rotation shafts of the plurality of nip rollers are fed in the feeding direction with respect to the drive shaft of the drive roller. It is arranged so as to incline toward the downstream side, and the nip position with respect to the recording medium by the nip roller and the driving roller is on the upper side with respect to the lowermost end portion of the outer periphery of the driving roller and the feeding method And it is characterized in that it is positioned on the upstream side.

  According to a second aspect of the present invention, in the image recording apparatus according to the first aspect, each rotation shaft of the plurality of nip rollers has a width perpendicular to the feeding direction of the feeding path at both ends thereof. The end portion on the side close to the substantially central portion in the direction is arranged so as to be inclined toward the downstream side in the feeding direction.

  According to a third aspect of the present invention, in the image recording apparatus according to the first or second aspect, the plurality of nip rollers are arranged around a substantially central portion in the width direction of the feeding path. Both sides are symmetrical in shape.

  According to a fourth aspect of the present invention, in the image recording apparatus according to any one of the first to third aspects, the outer shape of the nip roller is formed such that a predetermined region including a nip position in the axial direction of the nip roller has the same diameter. It is characterized by being.

  According to a fifth aspect of the present invention, in the image recording apparatus according to any one of the first to fourth aspects, an outer periphery of one or both of the drive roller and the nip roller is at least a part at the nip position. Is made of a rubber-like elastic material.

  According to a sixth aspect of the present invention, in the image recording apparatus according to any one of the third to fifth aspects, of the plurality of nip rollers, the nip roller disposed in the same direction is provided on a rotating shaft thereof. The axis is arranged in parallel in a plane substantially parallel to the feeding path.

  The invention according to claim 7 is the image recording apparatus according to any one of claims 3 to 6, wherein the recording medium has a substantially central portion in the width direction in the width direction of the feeding path. The sheet is fed after being aligned with a substantially central portion.

  According to an eighth aspect of the present invention, in the image recording apparatus according to the sixth or seventh aspect, each nip position between the nip roller and the drive roller arranged in the same direction is inclined in the feeding direction. It is located on the same straight line extended orthogonally.

  The invention according to claim 9 is the image recording apparatus according to any one of claims 1 to 8, wherein the recording medium is placed on the nip via a U-turn conveyance path from a lower side than the nip position. It is transported to a position.

  According to the first aspect of the present invention, the rotation shaft of the nip roller is arranged to be inclined with respect to the drive shaft of the drive roller, and the nipping (nip) of the recording medium by the nip roller and the drive roller is the same number as the nip roller. Therefore, when the sandwiched state is released, the recording medium is pushed out in the feeding direction more than the case where the recording medium is sandwiched by line contact in the width direction. The power can be reduced.

  Further, each nip position is located on the upper side and the upstream side in the feeding direction with respect to the lowermost end portion of the outer periphery of the driving roller, and the contact end position of the recording medium with the nip roller and the driving roller is higher than the nip position. Since the rear end of the recording medium is out of the nip position, the recording medium is further guided below the nip position along the outer periphery on the lower end side of the driving roller, and the contact with the driving roller is completed. For this reason, the recording medium is transported while suppressing the upward warping of the rear end thereof, and the flatness is maintained over the entire surface. As a result, it is possible to realize highly accurate feeding without impairing the recording quality in the image recording unit.

  According to the second aspect of the present invention, during feeding, the nip roller rotates toward both side ends in the longitudinal direction of the feeding direction and acts on the recording medium to pull the both side ends. Therefore, the recording medium can be fed to the image recording unit while preventing the occurrence of bending or wrinkles in the vicinity of the central portion.

  According to the third aspect of the present invention, the recording medium is sandwiched with good balance along the width direction.

  According to the fourth aspect of the present invention, compared to the case where the outer shape of the nip roller is formed in a tapered shape, there is an effect that the alignment with the driving roller is facilitated in setting the nip position.

  According to the fifth aspect of the present invention, the rubber-like elastic material is compressed and deformed, so that curved surface contact is obtained in a small range at each of the plurality of nip positions. Therefore, when the recording medium deviates from the nip position, in addition to the above-described effects due to the release of the clamping state by a plurality of points (nip position), the clamping state is gradually and gradually released at each nip position. The effect of suppressing the generation of an excessive force for pushing the recording medium is improved.

  According to the sixth aspect of the present invention, it is possible to reduce the occupied space in the feeding direction in the arrangement of the nip rollers as compared with the case where the nip rollers are arranged on the same axis.

  According to the seventh aspect of the present invention, the arrangement of the nip rollers is coupled with the fact that both sides of the feeding path in the width direction centering on the substantially central portion in the width direction are symmetrical. Even if the size in the width direction is different, the recording medium can always be nipped and transported in a balanced manner along the width direction.

  According to the eighth aspect of the present invention, even if the size of the recording medium to be conveyed is different in the width direction and the size is out of the standard, the recording medium is always fed to the front end of the recording medium. In addition to being able to start clamping at the same position in the direction, the recording medium can always be clamped and conveyed in the width direction in a balanced manner.

  According to the ninth aspect of the present invention, the recording medium is lifted and conveyed from the lower side via the U-turn conveyance path. In other words, a relatively large nip force is required between the driving roller and the nip roller. Even in this case, the recording medium is not sent out excessively, and the nipping state between the driving roller and the nip roller is released, so that highly accurate feeding can be realized to the image recording unit.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of an image recording apparatus provided with an ink jet recording head according to the present invention, FIG. 2 is a side sectional view, FIG. 3 is a plan view of the image recording apparatus in a state where the image reading apparatus is removed, and FIG. 3 is a cross-sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a perspective view of the image recording apparatus with the carriage removed, FIG. 6 is a plan view showing the state where the nip roller is supported, and FIG. FIG. 8 is a schematic plan view for explaining the arrangement of the nip rollers.

  An image recording apparatus 1 according to the present embodiment is an application of the present invention to a multi-function device (MFD) having a printer function, a copy function, a scanner function, and a facsimile function. As shown, the image recording apparatus 1 includes a housing 2 made of a synthetic resin injection-molded product as a recording apparatus main body.

  An image reading device 12 for a copy function and a facsimile function is disposed on the upper portion of the housing 2, and the image reading device 12 can be vertically opened and closed with respect to one side end of the housing 2 via a pivot portion (not shown). Further, the rear end of the document cover 13 that covers the upper surface of the image reading device 12 is attached to the rear end of the image reading device 12 so as to be rotatable up and down around a pivot 12a.

  On the upper side of the housing 2, an operation panel unit 14 including various operation buttons and a liquid crystal display unit is provided in front of the image reading device 12. On the upper surface of the image reading device 12, there is provided a placement glass plate 16 on which the document cover body 13 can be opened and a document can be placed. A CIS (Contact Image Sensor) 17 is provided so as to be capable of reciprocating along a guide shaft 44 extending in a direction orthogonal to the paper surface of FIG. 2 (main scanning direction, Y-axis direction in FIG. 1).

  In the ink storage unit (not shown), ink cartridges for each color of black (Bk), cyan (C), magenta (M), and yellow (Y) are stored as cartridges for individual colors in this embodiment. Thus, each ink cartridge and the recording head 4 in the recording unit 7 (corresponding to the image recording unit in the claims) are always connected by a flexible ink supply pipe.

  A paper feed cassette 3 that can be inserted from an opening 2 a on the front side (left side in FIG. 2) is disposed at the bottom of the housing 2. In the present embodiment, the paper feed cassette 3 is a recording medium, for example, a paper P cut into A4 size, letter size, legal size, postcard size, etc., and its short side is in the paper transport direction (sub-scanning direction, A configuration in which a plurality of sheets are stacked (stacked) and stored so as to extend in a direction orthogonal to the X-axis direction (in FIG. 2, a direction orthogonal to the paper surface, a main scanning direction, and a Y-axis direction).

  On the back side (right side in FIG. 2) of the paper feed cassette 3, a separation inclined plate 8 is disposed for paper separation. Further, on the housing 2 side, a base end portion of a paper feeding arm 6a in the paper feeding means 6 is mounted so as to be rotatable in the vertical direction, and a paper feeding roller 6b provided at a tip portion of the paper feeding arm 6a The rotation from a drive source (not shown) is transmitted by a gear transmission mechanism 6c provided in the paper feed arm 6b (see FIG. 4). The sheet P, which is a recording medium stacked (stacked) on the sheet feeding cassette 3, is separated and conveyed one by one by the sheet feeding roller 6b and the separation inclined plate 8. The separated sheet P is fed to the recording unit 7 provided on the upper side (high position) behind the sheet feeding cassette 3 through a feeding path 9 including a lateral U-turn path. The feeding path 9 is formed in a gap between a first conveyance path body 60 that forms the outer peripheral side of the U-turn shape and a second conveyance path body 52 (described later) that forms the inner peripheral side. In the feeding path 9, the sheet P is aligned by centering so that the center line B in the width direction of the sheet P is aligned with the center line B in the width direction (hereinafter simply referred to as the width direction) orthogonal to the feeding direction. Is configured to be conveyed.

  As shown in FIGS. 2 to 5, the recording unit 7 is supported by a box-shaped main frame 21 and a pair of left and right side plates 21 a, and has a horizontally long plate-like shape extending in the Y-axis direction (main scanning direction). It is formed between the first and second guide members 22 and 23. The carriage 5 on which the ink jet recording head 4 is mounted in the recording unit 7 is slidably supported (mounted) across the first guide member 22 on the upstream side and the second guide member 23 on the downstream side in the paper transport direction. It can be moved back and forth.

  In order to reciprocate the carriage 5, a timing belt 24 extends on the upper surface of the second guide member 23 disposed on the downstream side in the paper transport direction (arrow A direction) so as to extend in the main scanning direction (Y-axis direction). A CR (carriage) motor (not shown) that is disposed and drives the timing belt 24 is fixed to the lower surface of the second guide member 23.

  A flat platen 26 extending in the Y-axis direction so as to face the lower surface of the recording head 4 in the carriage 5 is fixed to the main frame 21 between the guide members 22 and 23 (see FIG. 3). .

  On the upstream side of the platen 26 in the conveying direction, a driving roller 50 and a nip roller 51 are disposed above the driving roller 50 as a conveying (registration) roller for feeding the paper P to the lower surface of the recording head 4. Has been. The drive roller 50 and the nip roller 51 will be described in detail later. Further, on the downstream side of the transport of the platen 26, a paper discharge roller 28 that is driven so as to transport (discharge) the recorded paper P to the paper discharge unit 10, and to the paper discharge roller 28 side opposite thereto. A biased spur roller 28a is disposed (see FIGS. 2 and 4).

  The paper discharge unit 10 from which the paper P recorded by the recording unit 7 is discharged with its recording surface facing upward is formed on the upper side of the paper feed cassette 3, and is a paper discharge port 10a communicating with the paper discharge unit 10. Is opened in common with the opening 2 a on the front surface of the housing 2. Further, a synthetic resin partition plate (lower cover body) that covers the upper portion of the paper discharge unit 10 from the lower surface of the guide member 23 on the downstream side in the paper transport direction to the paper discharge port 10a at the front end of the housing 2. ) 29 is formed integrally with the housing 2 (see FIG. 2).

  Next, a sandwiching structure for the paper P by the driving roller 50 and the nip roller 51 will be described in detail.

  As shown in FIG. 5, the drive roller 50 described above extends long in the direction orthogonal to the feeding direction (Y-axis direction), and both ends thereof are pivotally supported by the side plate 21a of the main frame 21, so that a drive source (not shown) The driving force is transmitted and is driven to rotate. As shown in FIGS. 5 and 6, a plurality of nip rollers 51 are provided substantially along the axial direction of the drive roller 50.

  In this embodiment, four nip rollers 51 are provided (indicated individually as 51a, 51b, 51c, and 51d), and each nip roller 51 is a synthetic resin cylinder into which a metal rotation shaft 53 is fitted. A rubber-like elastic material 57 is covered on the outer periphery of the diameter member. The rubber-like elastic material 57 may be disposed at least at the nip position with the driving roller 50. The outer shape of the nip roller 51 is preferably such that a predetermined region including the nip position is formed in the same diameter in the axial direction, and here, a rubber-like elastic material is continuously provided in the longitudinal direction of the cylindrical member. It is attached. In addition, for example, an annular rubber-like elastic material may be placed on both ends of the cylindrical member, and a rubber-like elastic material of a different material may be wound around the central portion of the cylindrical member. On the other hand, the drive roller 50 is formed by coating the surface of a metal shaft with ceramic particles or the like. In addition, the raw material of the outer periphery of the drive roller 50 and the nip roller 51 is not limited to the above-mentioned form. Contrary to the above, a rubber-like elastic member may be applied to the driving roller 50 and a coating of ceramic or the like may be applied to the nip roller 51, as long as an appropriate nip property that does not cause a slip or the like in feeding the paper P can be provided. Other materials may be used.

  The four nip rollers 51 described above are arranged in a row on the second conveyance path body 52 constituting the feeding path 9, and are rotatably supported. The second transport path body 52 is made of synthetic resin and is formed long in a direction (Y-axis direction) orthogonal to the feeding direction. A plurality of protrusions 54 extending along the feeding direction are provided on the upper surface of the second transport path body 52, and the edge on the upstream side in the feeding direction is curved downward. An end portion on the downstream side in the feeding direction is divided into four support pieces 56 by three cut portions 55 that are linearly drilled along the feed direction. The nip rollers 52 are individually supported. The end of the support piece 56 on the downstream side in the feeding direction is formed in a hollow shape, and the nip roller 51 has an uppermost end portion and a tip of the protruding portion 54 at substantially the same height. Attached to each support piece 56.

  In addition, coil springs 58 as urging means for urging the nip roller 51 toward the drive roller 50 are attached between the lower surface of each support piece 56 and the main frame 21 corresponding to the position of each nip roller 51. Thus, each nip roller 51 can be reliably biased toward the drive roller 50.

  When the nip roller 51 is attached to the second conveyance path body 52, as shown in FIGS. 6 and 8, the end portion of the nip roller 51 on the side close to the central portion in the width direction is the end portion of the rotation shaft 53 of the nip roller 51. , And are supported so as to be inclined toward the downstream side in the feeding direction (direction of arrow A). 6 and 8, the central portion in the width direction of the feeding path 9 is indicated by a one-dot chain line with the center line B as a center line B. Further, the nip roller 51 is arranged symmetrically on both sides with respect to the center line B in the width direction, and the nip roller 51 arranged to be inclined in the same direction is the axis of the rotation shaft 53. Are arranged in parallel in a plane substantially parallel to the feeding path. That is, as shown in the schematic plan view of FIG. 8, the rotation shafts 53 of the two nip rollers 51c and 51d located on the right side of the center line B are inclined to the right at an angle θ. The rotation shafts 53 of the two nip rollers 51a and 51b located on the left side of the center line B are disposed so as to incline upward at an angle θ. The nip position N between the nip roller 51 and the driving roller 50 is located on the same straight line C orthogonal to the feeding direction. This straight line C is shown in FIG. Further, since the sheet P has a thickness, the contact start position R1 of the sheet P with respect to the driving roller 50 and the nip roller 51 is located upstream from the nip position N, and the contact end position R2 is located downstream from the nip position N. To position. Four contact start positions R1 with respect to the paper P are located on the same straight line C1 orthogonal to the feeding direction, and four contact end positions R2 are located on the same straight line C2 perpendicular to the feed direction.

  The nip position N with respect to the paper P by the drive roller 50 and the nip roller 51 is, as shown in the schematic cross-sectional view of FIG. It is located upstream in the feeding direction by ΔL, and the lowermost end portion S of the driving roller 50 coincides with the contact end position R2 with respect to the paper P described above.

  In the image recording apparatus 1 configured as described above, the uppermost sheet P among the sheets P stacked in the sheet feeding cassette 3 moves forward by the rotation of the sheet feeding roller 6b based on an image recording command. The tip of the contact comes into contact with the separating inclined plate 8 and is guided to the feeding path 9. The sheet P makes a U-turn from the lower side to the upper side through the feeding path 9, and when the front end thereof reaches the straight line C1 shown in FIG. 8, the contact with the driving roller 50 and the nip roller 51 starts. Nipping with a predetermined urging force is performed.

  Since the rotation shaft 53 of the nip roller 51 is provided to be inclined with respect to the drive shaft of the drive roller 50, the drive roller 50 and the nip roller 51 are in point contact, and in this embodiment, at four nip positions N (points). It is pinched. Therefore, compared with a case where the rear end of the paper P is held by a long line contact and the holding state is released at a time, even if the nip roller 51 and the driving roller 50 have a sufficient nip force, It is possible to weaken the force for feeding the trailing edge of the paper P excessively in the feeding direction.

  Further, as shown in FIG. 7, the nip position N is located above the lowermost position S of the driving roller 50 and upstream in the feeding direction. Therefore, after the rear end of the sheet P is free from the nip position N, the sheet P is guided downward along the curved surface on the lower end side of the driving roller 50 and proceeds to the lowermost end that is the contact end position R2 of the sheet P. Since the position S is reached, the upward warping is suppressed. Accordingly, the sheet P is transported to the recording unit 7 while maintaining the flatness as it is, and the gap between the recording head 4 and the sheet P is kept uniform over the entire surface of the sheet P, so there is no concern that the recording quality is impaired. .

  Further, at the nip position N, the nip roller 51 is made of the rubber-like elastic material 57 and the nip roller 52 is biased toward the driving roller 50, so that the rubber-like elastic material 57 is compressed and deformed at the nip position N. Strictly speaking, the surface contact is curved in a slight range. For this reason, when the trailing edge of the paper P is out of the nip position N, the sandwiched state due to the curved surface contact is gradually released, so that the effect of preventing excessive feeding to the paper P is further enhanced.

  Further, the sheet P is conveyed center-aligned in the feeding path 9, the nip rollers 51 are arranged symmetrically on both sides of the center line B of the feeding path 9, and the nip position N is all set. When the size in the width direction of the paper P is different due to the arrangement on the straight line C (for example, when indicated by W1 and W2 in FIG. 8), even if the size is a non-standard size, Since the sheet P is sandwiched symmetrically on both sides of the center line B, the nip force is uniform in the width direction, and the sheet P can be fed straight without being inclined toward the downstream side in the feeding direction. In addition, regardless of the paper size, when the front end reaches the straight line C, clamping is performed with a predetermined urging force. In other words, even if the paper size changes, the nip position does not shift in the feeding direction, so that there is no variation in the conveyance conditions.

  Further, as shown in FIG. 8, the nip roller 51 is inclined so that the end on the center line B side of the both ends of the rotation shaft 53 is directed downstream in the feeding direction. In other words, the sheet P fed to the nip roller 51 is fed from the center line B side toward both side edges (outside in the width direction) extending in the sheet P feeding direction (arrow A direction). Since the force acts, the paper P is subjected to tension pulled toward the both side edges. As a result, wrinkles and bending can be prevented from occurring near the center line B of the paper P, and the paper P can be kept flat and fed to the image recording unit 7.

  In the present embodiment, the paper feed cassette 3 is disposed below the recording unit 7 and is fed so that the paper P is pulled up from below via a U-turn path. Compared to the case of feeding, the driving roller 50 and the nip roller 51 need to sandwich the paper P with a strong force, and the nip roller 51 exerts a relatively strong biasing force. For this reason, in the image recording apparatus 1 having such a strong nip force, the structure that prevents the phenomenon that the trailing edge of the paper P is excessively fed as described above can have a very large effect.

1 is a perspective view of an image recording apparatus provided with an ink jet recording head of the present invention. It is a sectional side view of an image recording device. FIG. 3 is a plan view of the image recording apparatus with the image reading apparatus removed. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. FIG. 3 is a perspective view of the image recording apparatus with a carriage removed. It is a top view which shows the state by which the nip roller was supported. It is a schematic cross section explaining the positional relationship between the drive roller and the nip roller. It is a model top view explaining arrangement | positioning of a nip roller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image recording apparatus 2 Housing 3 Paper feed cassette 4 Recording head 5 Carriage 6 Paper feed means 7 Recording part 9 Feed path 10 Paper discharge part 12 Image reader 21 Main frame 26 Platen 28 Paper discharge roller 28a Spur roller 50 Drive roller 51 Nip roller 52 Second transport path 53 Rotating shaft 54 Projection 55 Cut section 56 Support piece 57 Rubber elastic material 58 Coil spring 60 First transport path

Claims (9)

An image recording unit that records an image on a recording medium, and a feeding path that feeds the recording medium to the image recording unit. In the feeding path, a driving roller driven by a driving source and a driving roller In an image recording apparatus configured to feed a recording medium while being sandwiched with a driven nip roller,
A plurality of the nip rollers are provided below the drive roller and substantially along the direction of the drive shaft of the drive roller, and each rotation shaft of the plurality of nip rollers is supplied to the drive shaft of the drive roller. It is arranged to incline toward the downstream side in the feed direction,
An image recording apparatus characterized in that a nip position with respect to a recording medium by the nip roller and the driving roller is positioned on the upper side and the upstream side in the feeding direction with respect to the lowest end portion of the outer periphery of the driving roller. .   Each of the rotation shafts of the plurality of nip rollers has an end on the side close to a substantially central portion in the width direction orthogonal to the feeding direction of the feeding path, of both ends thereof, toward the downstream side in the feeding direction. The image recording apparatus according to claim 1, wherein the image recording apparatus is inclined.   3. The image according to claim 1, wherein the plurality of nip rollers are arranged so that both sides of the feeding path in the width direction centering on a substantially central portion in the width direction are symmetrical. Recording device.   4. The image recording apparatus according to claim 1, wherein a predetermined area including a nip position in the axial direction of the nip roller is formed to have the same diameter as the outer shape of the nip roller.   5. The image recording apparatus according to claim 1, wherein at least a portion of the nip position on the outer periphery of one or both of the driving roller and the nip roller is made of a rubber-like elastic material.   Among the plurality of nip rollers, the nip roller disposed to be inclined in the same direction is characterized in that the axis of the rotation shaft is disposed in parallel in a plane substantially parallel to the feeding path. The image recording apparatus according to claim 3.   7. The recording medium is fed with a substantially central portion in the width direction aligned with a substantially central portion in the width direction of the feeding path. Image recording device.   8. The nip position between the nip roller and the driving roller arranged so as to be inclined in the same direction is located on the same straight line extending perpendicular to the feeding direction. Image recording device.   The image recording apparatus according to claim 1, wherein the recording medium is transported to the nip position from a lower side than the nip position via a U-turn transport path.

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