Medium conveying device and recording device

Abstract

To suppress occurrence of wrinkles of a medium caused by a path difference between a first path and a second path.SOLUTION: A medium conveying device 3 comprises: a conveying roller pair 10 that has a main roller 14 that applies feeding force toward a conveying direction to a medium 2 and a plurality of sub rollers 16 that followingly rotates around a first shaft 15 while gripping the medium in pair with the main roller and are arranged with an interval from each other along a longitudinal direction of the main roller; and an adjusting part 19 that adjusts a path difference between a first path 17 and a second path 18, where a path on which the medium 2 is conveyed while being gripped between the main roller and the sub rollers is defined as the first path, and a path on which the medium is conveyed while being contacted with the main roller without being contacted with the sub rollers is defined as the second path.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a medium transport device and a recording device. [Background technology]

[0002] An example of this type of device is the recording device described in Patent Document 1. Patent Document 1 describes the following. The transport roller pair and the paper feed roller pair form a transport section that transports cut paper CP or roll paper RP. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-182716 Summary of the Invention [Problem to be solved by the invention]

[0004] In terms of transporting the medium, it is preferable that the transport roller pair or the paper feed roller pair be a pair of single rollers extending in the width direction. However, this increases costs and it is not easy to ensure that one roller is parallel to the other roller, so the other roller is usually made up of multiple rollers. However, with this configuration, there is a difference in the conveying force on the medium between the nipped and non-nipped areas of the two rollers. Specifically, because there is no nipping between the driven rollers, the non-nipped path of the medium rises more than the nipped path, creating a difference between the raised and non-raised areas, making wrinkles more likely to occur. In particular, when the medium has a three-dimensional structure formed by weaving or knitting threads, such as fabric, the difference between the paths of the driven roller with and without a nip, i.e., the existence of the nip path and the non-nip path, makes it easy for expansion and contraction or deformation to occur, and wrinkles are likely to occur. There is room for improvement in terms of such wrinkle occurrence. [Means for solving the problem]

[0005] In order to solve the above problem, the media transport device of the present invention comprises a transport roller pair having a main roller that applies a feed force to the media in the transport direction, and a plurality of sub-rollers that rotate drivenly around a first axis while clamping the media between the pair of main rollers and are arranged at intervals along the longitudinal direction of the main roller, and an adjustment unit that adjusts the path difference between the first path and the second path, where the path along which the media is clamped and transported between the main roller and the plurality of sub-rollers is defined as a first path, and the path along which the media is transported in contact with the main roller but not in contact with the plurality of sub-rollers is defined as a second path.

[0006] Moreover, the recording device of the present invention comprises a recording unit that records on a medium, and a medium transport device that transports the medium toward the recording unit, wherein the medium transport device comprises a transport roller pair having a main roller that applies a feed force to the medium in a transport direction, and a plurality of sub-rollers that rotate around a first axis while sandwiching the medium between the pair of main rollers and are arranged at intervals along the longitudinal direction of the main roller, and an adjustment unit that adjusts the path difference between the first path and the second path, where a path along which the medium is sandwiched and transported between the main roller and the plurality of sub-rollers is defined as a first path, and a path along which the medium is transported without contacting the main roller but without contacting the plurality of sub-rollers is defined as a second path. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a recording apparatus according to a first embodiment. [Figure 2] FIG. 1 is a schematic cross-sectional side view of a recording apparatus according to a first embodiment. [Figure 3] 2 is a schematic side view of a main part of the medium conveying device of the first embodiment. FIG. [Figure 4] FIG. 2 is a perspective view of a main part of the medium conveying device according to the first embodiment. [Figure 5] FIG. 11 is a schematic side view of a main part of a medium conveying device according to a third embodiment. [Figure 6] FIG. 11 is a perspective view of a main part of a medium conveying device according to a third embodiment. [Figure 7] FIG. 10 is a schematic side view of a main part of a medium conveying device according to a second embodiment. [Figure 8] FIG. 10 is a perspective view of a main part of a medium conveying device according to a second embodiment. [Figure 9] FIG. 10 is a schematic side view of a main part of a medium conveying device according to a fourth embodiment. [Figure 10] FIG. 10 is a perspective view of a main part of a medium conveying device according to a fourth embodiment. [Figure 11] FIG. 10 is a perspective view of a main part of a medium conveying device according to a fifth embodiment. [Figure 12] FIG. 13 is a schematic side view of a main part of a medium conveying device according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] The present invention will now be briefly described. A media transport device according to a first aspect of the present invention comprises a transport roller pair having a main roller that applies a feed force to the media in the transport direction, and a plurality of sub-rollers that rotate drivenly around a first axis while sandwiching the media between the pair of main rollers and the main roller, and are arranged at intervals along the longitudinal direction of the main roller; and an adjustment unit that adjusts the path difference between the first path and the second path, where a first path is a path along which the media is sandwiched and transported between the main roller and the plurality of sub-rollers, and a second path is a path along which the media is transported in contact with the main roller but not in contact with the plurality of sub-rollers. Here, "adjusting the path difference" in "an adjustment unit that adjusts the path difference between the first path and the second path" means applying a force to the portion of the medium located on the first path and the portion of the medium located on the second path in a direction that brings them relatively closer together in a cross direction that intersects the transport direction and the longitudinal direction.

[0009] According to this aspect, an adjustment unit is provided that adjusts the path difference between the first path, which is a path along which the medium is sandwiched between the main roller and the plurality of sub-rollers and the second path, which is a path along which the medium is transported in contact with the main roller but not the plurality of sub-rollers. This adjustment unit can suppress the occurrence of wrinkles in the medium, which are likely to occur due to the existence of the first path and the second path.

[0010] A medium transport device according to a second aspect of the present invention is an aspect dependent on the first aspect, and is characterized in that the first axis of the sub-roller is arranged offset in the transport direction relative to the rotation axis of the main roller.

[0011] In the transport roller pair in which the first axis of the sub-roller is positioned offset in the transport direction relative to the rotation axis of the main roller, the path difference tends to be large, and therefore wrinkles tend to occur easily. However, according to this aspect, the adjustment unit can suppress the occurrence of wrinkles in the medium due to the path difference. In other words, when the transport roller pair has such a structure, the obtained effect is remarkable.

[0012] A medium transport device according to a third aspect of the present invention is an aspect dependent on the first aspect, characterized in that the adjustment unit is a pressing unit that is arranged downstream of the sub-roller in the transport direction and presses the medium from the sub-roller side, and the pressing unit is arranged at a position that overlaps with the portion between the multiple sub-rollers in the longitudinal direction and presses the medium on the second path.

[0013] According to this aspect, the pressing unit is disposed downstream of the sub-roller in the transport direction and presses the medium from the sub-roller side. Furthermore, the pressing unit is disposed in a position overlapping with a portion between the sub-rollers in the longitudinal direction and presses the medium on the second path. By using the pressing unit, the adjustment unit can be simplified in structure, thereby preventing wrinkles from forming on the medium.

[0014] A medium conveying device according to a fourth aspect of the present invention is an aspect dependent on the first aspect, characterized in that the adjustment unit is positioned downstream of the sub-roller in the conveying direction and is a suction unit that sucks the medium from the main roller side, and the suction unit is positioned at a position overlapping with the portion between the multiple sub-rollers in the longitudinal direction and sucks the medium in the second path.

[0015] According to this aspect, a suction unit is disposed downstream of the sub-roller in the transport direction and sucks the medium from the main roller. Furthermore, the suction unit is disposed at a position overlapping with a portion between the sub-rollers in the longitudinal direction and sucks the medium in the second path. By using the suction unit instead of the pressing unit, the adjustment unit can be simplified in structure, thereby preventing wrinkles from forming on the medium.

[0016] A media transport device according to a fifth aspect of the present invention is an aspect dependent on the first aspect, characterized in that the adjustment unit is a pressing unit that is positioned downstream of the sub-roller in the transport direction and presses the media from the main roller side, and the pressing unit is positioned at a position overlapping multiple sub-rollers in the longitudinal direction and presses the media on the first path.

[0017] According to this aspect, a pressing unit is disposed downstream of the sub-roller in the transport direction and presses the medium from the main roller side. Furthermore, the pressing unit is disposed in a position overlapping with the sub-rollers in the longitudinal direction and presses the medium on the first path. By using the pressing unit that presses the medium from the main roller side, the adjustment unit can be simplified in structure, thereby preventing wrinkles from forming on the medium.

[0018] A media conveying device according to a sixth aspect of the present invention is an aspect dependent on the first aspect, characterized in that the adjustment unit is positioned downstream of the sub-roller in the conveying direction and is a suction unit that sucks the media from the sub-roller side, and the suction unit is positioned at a position overlapping multiple sub-rollers in the longitudinal direction and sucks the media in the first path.

[0019] According to this aspect, a suction unit is disposed downstream of the sub-roller in the transport direction and sucks the medium from the sub-roller side. Furthermore, the suction unit is disposed at a position overlapping with the sub-rollers in the longitudinal direction and sucks the medium on the first path. By using the suction unit that sucks the medium from the sub-roller side instead of the pressing unit, the adjustment unit can be simplified in structure, thereby preventing wrinkles from forming on the medium.

[0020] A media transport device according to a seventh aspect of the present invention is an aspect dependent on the first aspect, and comprises: a feed section that is positioned upstream of the pair of transport rollers in the transport direction and feeds out the medium wound in a roll; a winding section that is positioned downstream of the pair of transport rollers in the transport direction and winds up the medium being transported; and a processing section that is positioned between the feed section and the winding section and processes the medium being transported, and is characterized in that the adjustment section is positioned between the feed section and the processing section.

[0021] According to this aspect, the adjustment unit is disposed between the feeding unit and the processing unit in the transport direction, thereby enabling the processing unit to perform processing on the medium in a state in which the occurrence of wrinkles has been suppressed by the adjustment unit, thereby improving processing quality.

[0022] An eighth aspect of the medium transport device of the present invention is an aspect dependent on the third aspect, and comprises a support section that is arranged in an area opposite the pressing section and can indirectly contact the pressing section by sandwiching the medium, and a guide section that is arranged downstream of the pressing section in the transport direction and guides the medium being transported, and is characterized in that in an intersecting direction that intersects the transport direction and the longitudinal direction, the position at which the pressing section presses the medium against the support section is between a first position where the guide section contacts the medium and a second position where the medium is sandwiched between the main roller and the sub-roller. Here, in the phrase "between a first position where the guide portion contacts the medium and a second position where the medium is clamped between the main roller and the sub-roller," in this specification, the term "between" is used to mean that when the first position and the second position are the same position in the intersecting direction, the position where the medium is pressed is located on a straight line connecting the first position and the second position.

[0023] According to this aspect, the device includes a support portion that is disposed in an area facing the pressing portion and that can indirectly contact the pressing portion by sandwiching the medium between them, whereby the portion of the medium located on the first path and the portion of the medium located on the second path can be positioned in the same position while being sandwiched between the pressing portion and the support portion from both the front and back sides, thereby effectively suppressing the occurrence of wrinkles. Furthermore, according to this aspect, the position at which the pressing portion presses the medium against the support portion in the cross direction is between a first position where the guide portion contacts the medium and a second position where the medium is sandwiched between the main roller and the sub-roller, thereby making it possible to minimize the amount of displacement of the portion of the medium that is pressed by the pressing portion and displaced in the pressing direction.

[0024] A media transport device according to a ninth aspect of the present invention is an aspect dependent on the fifth aspect, and comprises a support section that is arranged in an area opposite the pressing section and can indirectly contact the pressing section by sandwiching the medium therebetween, and a guide section that is arranged downstream of the pressing section in the transport direction and guides the medium being transported, and is characterized in that in an intersecting direction that intersects the transport direction and the longitudinal direction, the position at which the pressing section presses the medium against the support section is on a straight line connecting a first position at which the guide section contacts the medium and a vertex position when the intersecting direction of the main roller is the height direction.

[0025] According to this aspect, the device includes a support portion that is disposed in an area facing the pressing portion and that can indirectly contact the pressing portion by sandwiching the medium between them, whereby the portion of the medium located on the first path and the portion of the medium located on the second path can be positioned in the same position while being sandwiched between the pressing portion and the support portion from both the front and back sides, thereby effectively suppressing the occurrence of wrinkles. Furthermore, according to this aspect, the position at which the pressing portion presses the medium against the support portion in the intersecting direction is on a line connecting a first position at which the guide portion contacts the medium and the apex position of the main roller when the intersecting direction is the height direction, thereby making it possible to minimize the amount of displacement of the portion of the medium that is pressed by the pressing portion and displaced in the pressing direction.

[0026] A media transport device according to a tenth aspect of the present invention is an aspect dependent on the fourth aspect, and comprises a support section arranged in an area opposite the suction section and supporting the medium being transported, a plurality of openings provided in a position opposite the second path of the support section, and a guide section arranged downstream of the suction section in the transport direction and guiding the medium being transported, wherein the suction section sucks the medium on the second path through the openings, and in a cross direction intersecting the transport direction and the longitudinal direction, the position at which the support section supports the medium is between a first position where the guide section contacts the medium and a second position where the medium is clamped between the main roller and the sub-roller. Here, in the phrase "between a first position where the guide portion contacts the medium and a second position where the medium is clamped between the main roller and the sub-roller," in this specification, the term "between" is used to mean that when the first position and the second position are the same position in the intersecting direction, the position where the medium is pressed is located on a straight line connecting the first position and the second position.

[0027] According to this aspect, the conveying device includes a support unit disposed in an area opposite the suction unit and configured to support the medium being conveyed. Furthermore, the suction unit suctions the medium in the second path through the opening provided in the support unit. This allows the portion of the medium located in the first path and the portion located in the second path to be positioned in the same position, sandwiched from both the front and back sides by the suction unit and the support unit, thereby effectively suppressing the occurrence of wrinkles. According to this aspect, the position at which the support section supports the medium in the cross direction is between a first position where the guide section contacts the medium and a second position where the medium is sandwiched between the main roller and the sub-roller, thereby minimizing the amount of displacement of the portion of the medium that is sucked by the suction section and displaced in the suction direction.

[0028] The media transport device according to an eleventh aspect of the present invention is an aspect dependent on the sixth aspect, and comprises: a support section arranged in an area opposite the suction section and supporting the transported media; a plurality of openings provided in the support section at a position opposite the first path; and a guide section arranged downstream of the suction section in the transport direction and guiding the transported media, wherein the suction section sucks the media on the first path through the openings, and in a cross direction intersecting the transport direction and the longitudinal direction, the position at which the support section supports the media is on a straight line connecting a first position where the guide section contacts the media and a vertex position when the cross direction of the main roller is the height direction.

[0029] According to this aspect, the feeding device includes a support unit disposed in an area opposite the suction unit and configured to support the medium being transported. Furthermore, the suction unit sucks the medium in the first path through the opening provided in the support unit. This allows the portion of the medium located in the first path and the portion located in the second path to be positioned in the same position, sandwiched from both the front and back sides by the suction unit and the support unit, thereby effectively suppressing the occurrence of wrinkles. Furthermore, according to this aspect, the position at which the support portion supports the medium in the intersecting direction is on a line connecting a first position where the guide portion contacts the medium and the apex position of the main roller when the intersecting direction is the height direction, thereby minimizing the amount of displacement of the portion of the medium that is sucked by the suction portion and displaced in the suction direction.

[0030] A media transport device according to a twelfth aspect of the present invention is an aspect dependent on the third aspect, and is characterized in that the pressing unit is a plurality of driven rollers that rotate around a second axis and are arranged at intervals along the longitudinal direction of the main roller, the adjustment unit comprises a pair of parallel link mechanisms in which a first arm, a second arm, a third arm, and a fourth arm are connected to form a parallelogram, the first arm is fixed to a frame, the first arm and the fourth arm are arranged in parallel, the second arm and the third arm are arranged in parallel, both ends of the first axis are supported at the connection points between each second arm of the pair of parallel link mechanisms and the fourth arm, both ends of the second axis are supported at the connection points between each third arm of the pair of parallel link mechanisms and the fourth arm, and the second arm is provided with an elastic member that applies an elastic force in the direction of pressing the sub-roller against the main roller.

[0031] According to this aspect, the adjustment unit includes a pair of parallel link mechanisms in which a first arm, a second arm, a third arm, and a fourth arm are connected to form a parallelogram. The first arm of the parallel link mechanisms is fixed to a frame. Furthermore, both ends of the first shaft are supported at connection portions of the second arms of the pair of parallel link mechanisms with the fourth arms, and both ends of the second shaft are supported at connection portions of the third arms of the pair of parallel link mechanisms with the fourth arms. Furthermore, the second arms are provided with elastic members that apply elastic force in a direction pressing the sub-roller against the main roller. When the thickness of the medium transported by the transport roller pair changes, the sub-roller is displaced by the amount of change in the thickness of the medium based on the elastic force of the elastic member. This displacement also displaces the first shaft. That is, the first shaft supported at the connection point between the second arm and the fourth arm is displaced. When the first shaft is displaced, the second arm supporting the first shaft rotates around the connection point with the first arm fixed to the frame. This rotation also causes the third arm constituting the parallel link mechanism to rotate around the connection point with the first arm, similar to the second arm. When the third arm rotates, the second shaft also displaces. That is, the second shaft supported at the connection point between the third arm and the fourth arm is displaced. When the second shaft is displaced, the driven roller supported on the second shaft is also displaced. According to this aspect, during each of the above displacements of the parallel link mechanism, the fourth arm is maintained parallel to the first arm fixed to the frame, so the first axis and the second axis are displaced equally in response to changes in the thickness of the medium, which allows the driven roller forming the pressing portion to maintain a state in which it presses the medium in the second path even if the thickness of the medium changes.

[0032] A recording device according to a thirteenth aspect of the present invention comprises a recording unit that records on a medium, and a medium transport device that transports the medium toward the recording unit, wherein the medium transport device comprises a pair of transport rollers having a main roller that applies a feed force to the medium in a transport direction, and a plurality of sub-rollers that rotate around a first axis while sandwiching the medium between the pair of main rollers and are arranged at intervals along the longitudinal direction of the main roller, and an adjustment unit that adjusts the path difference between the first path and the second path, where a path along which the medium is sandwiched and transported between the main roller and the plurality of sub-rollers is defined as a first path, and a path along which the medium is transported without contacting the main roller but without contacting the plurality of sub-rollers is defined as a second path. According to this aspect, the recording device can achieve the same effects as the first aspect.

[0033] [Embodiment] Hereinafter, an embodiment of a medium transport device and a recording device including the medium transport device according to the present invention will be described with reference to FIGS. In the following explanation, the three mutually orthogonal axes are referred to as the X-axis, Y-axis, and Z-axis, as shown in each figure. The directions indicated by the arrows on the three axes (X, Y, Z) are the + direction of each axis, and the opposite is the - direction. The Z-axis direction corresponds to the vertical direction, i.e., the direction in which gravity acts, the +Z direction indicates a vertically upward direction, and the -Z direction indicates a vertically downward direction. The X-axis and Y-axis directions correspond to horizontal directions. The +Y direction indicates the front direction of the recording device, and the -Y direction indicates the rear direction of the device. The +X direction indicates the right direction of the device, and the -X direction indicates the left direction of the device.

[0034] <Overall overview of the recording device> As shown in FIGS. 1 and 2, the recording apparatus 1 of this embodiment is a so-called digital textile printing machine in which the recording target medium 2 is fabric. The medium 2 is transported in a transport direction F along a transport path 4 by a medium transport device 3. This recording apparatus 1 uses a transport method called a roll-to-reel transport method to apply appropriate tension to the medium 2, thereby raising the recording execution area of ​​a recording unit 51, which serves as a processing unit 5 arranged along the transport path 4. After recording processing by the recording unit 51, the medium 2 is heated and dried by a heating unit 6 arranged along the transport path 4 and then wound up by a winding unit 7. Here, the recording unit 51 is a serial type mounted on a carriage (not shown) that moves back and forth in the width direction (X-axis direction) intersecting the transport direction F. Note that the recording unit 51 is not limited to a serial type and may be a line head. In this specification, the term "fabric" is used to refer not only to woven fabrics made by crossing warp and weft threads, but also to knitted fabrics made by creating loops with a single thread and intertwining them with adjacent loops, and nonwoven fabrics made by intertwining or bonding fibers together.

[0035] As shown in FIG. 2, in this embodiment, a roll R1 of medium 2 is rotatably supported on a payout shaft 9 of a payout unit 8. The medium 2 paid out from the roll R1 by the medium transport device 3 is transported by a transport roller pair 10 and an intermediate roller 11 that form a transport path 4 so as to pass through a recording area of ​​a recording unit 51. After recording processing by the recording unit 51 has been performed, the medium 2 is further transported by the intermediate roller 11 and a guide bar 12 through a heating area of ​​a heating unit 6. After passing through the guide bar 12, the medium 2 is taken up onto the roll R2 that is supported on a take-up shaft 13 of a take-up unit 7. The take-up shaft 13 is driven to rotate by rotational power transmitted from a drive source (not shown), rotating the roll R2 in the take-up direction.

[0036] [Embodiment 1] <Media transport device> 2 to 4, the medium transport device 3 according to the first embodiment will be described below. The medium transport device 3 of this embodiment includes a transport roller pair 10 located on the transport path 4 and applying a feeding force to the medium 2 in the transport direction F, and an intermediate roller 11 located downstream of the transport roller pair 10 on the transport path 4 in the transport direction F. The transport roller pair 10 is composed of a main roller 14, which is a drive roller that applies the feeding force to the medium 2, and a plurality of sub-rollers 16, 16, 16, ... that rotate drivenly around a first shaft 15 while sandwiching the medium 2 between the pair and the main roller 14. As shown in Figure 4, the plurality of sub-rollers 16, 16, 16, ... are rotatably supported on the first shaft 15 at intervals from one another along the longitudinal direction (X-axis direction) of the main roller 14.

[0037] As shown in Figure 4, the media conveying device 3 is equipped with an adjustment unit 19 that adjusts the path difference between the first path 17 and the second path 18, where the path along which the media 2 is conveyed by being sandwiched between the main roller 14 and multiple sub-rollers 16, 16, 16, ... is defined as a first path 17, and the path along which the media 2 is conveyed by coming into contact with the main roller 14 but not coming into contact with the multiple sub-rollers 16, 16, 16, ... is defined as a second path 18. Here, "adjusting the path difference" in "adjustment unit 19 that adjusts the path difference between first path 17 and second path 18" means applying a force to portion 20 (Figure 3) of medium 2 located on first path 17 and portion 21 (Figure 3) located on second path 18 in a direction that brings them relatively closer together in the conveying direction F and the transverse direction (Z-axis direction) that intersects with the longitudinal direction (X-axis direction).

[0038] 3, in this embodiment, the first shafts 15 of the sub-rollers 16, 16, 16, ... are arranged offset in the conveying direction F with respect to the rotational shaft 22 of the main roller 14. In other words, the positions of the first shafts 15 of the sub-rollers 16, 16, 16, ... in the conveying direction F are arranged at positions different from the position of the rotational shaft 22 of the main roller 14. In this embodiment, the first shafts 15 of the sub-rollers 16, 16, 16, ... are arranged downstream in the conveying direction F with respect to the rotational shaft 22 of the main roller 14. This increases the area over which the medium 2 comes into contact with the main roller 14, enabling a feeding force to be effectively applied to the medium 2. It goes without saying that the first shafts 15 of the sub-rollers 16, 16, 16, . . . may be positioned vertically above the rotation shaft 22 of the main roller 14, and may not be arranged offset in the conveying direction F as described above.

[0039] 3, in this embodiment, the adjustment unit 19 includes a plurality of pressing units 23 that press the medium 2 from the side of the sub-rollers 16. The pressing units 23 are arranged downstream of the sub-rollers 16 in the transport direction F. Furthermore, the pressing portions 23, 23, 23, ... are arranged in positions that overlap with portions 24 between the multiple sub-rollers 16, 16, 16, ... in the longitudinal direction (X-axis direction). The pressing portions 23, 23, 23, ... are configured to press the medium 2 on the second path 18 by the above-mentioned arrangement.

[0040] In this embodiment, the pressing units 23, 23, 23, ... are configured to individually apply a pressing force P by individual pressing sources (not shown). The magnitude of the pressing force P is configured to be changeable and adjustable depending on the type and thickness of the medium 2. Alternatively, the pressing units 23 may be rotatably attached to a common shaft, and the common shaft may be pressed by a pressing source (not shown). In this case, it is preferable that the pressing units 23 are driven rollers.

[0041] As shown in FIG. 2, in this embodiment, the recording unit 51 as the processing unit 5 that processes the transported medium 2 is disposed between the payout unit 8 and the winding unit 7. As shown in FIG. 3, the pressing unit 23, which is the adjusting unit 19, is disposed at a position between the feeding unit 8, which is located upstream in the conveying direction F, and the recording unit 51, which is the processing unit 5.

[0042] 2 and 3, in this embodiment, the medium conveying device 3 includes a support unit 25 that is disposed in an area facing the pressing unit 23 and can indirectly contact the pressing unit 23 by sandwiching the medium 2 therebetween, and a guide unit 26 that is disposed downstream of the pressing unit 23 in the conveying direction F and guides the conveyed medium 2. The pressing unit 23 is disposed so as to contact the front surface Mf of the medium 2, and the support unit 25 is disposed so as to contact the back surface Mb of the medium 2. In the cross direction (Z-axis direction) that intersects with the conveying direction F and the longitudinal direction (X-axis direction), the position 27 where the pressing portion 23 presses the medium 2 against the support portion 25 is configured to be between a first position 28 where the guide portion 26 contacts the medium 2 and a second position 29 where the medium 2 is clamped between the main roller 14 and the sub-roller 16.

[0043] <Explanation of Effects of Embodiment 1> (1) In this embodiment, an adjustment unit 19 is provided that adjusts the difference between a first path 17, which is a path along which the medium 2 is sandwiched and transported between the main roller 14 and the multiple sub-rollers 16, 16, 16, ..., and a second path 18, which is a path along which the medium 2 is transported in contact with the main roller 14 but not in contact with the multiple sub-rollers 16, 16, 16, .... This adjustment unit 19 can suppress the occurrence of wrinkles in the medium 2 that are likely to occur due to the presence of the first path 17 and the second path 18.

[0044] (2) When the conveying roller pair 10 is configured such that the first axes 15 of the sub-rollers 16, 16, 16, ... are offset in the conveying direction F relative to the rotation axis 22 of the main roller 14, the path difference tends to become large, and therefore wrinkles tend to occur easily. However, according to this embodiment, the occurrence of wrinkles in the front body 2 due to the path difference can be suppressed by the adjustment unit 19. In other words, when the transport roller pair 10 has such a structure, the obtained effect is remarkable.

[0045] (3) In this embodiment, the pressing unit 23 constituting the adjustment unit 19 is positioned downstream of the sub-rollers 16, 16, 16, ... in the conveying direction F, and presses the medium 2 from the side of the sub-rollers 16, 16, 16, .... Furthermore, the pressing unit 23 is positioned to overlap with a portion 24 between the multiple sub-rollers 16, 16, 16, ... in the longitudinal direction (X-axis direction), and presses the medium 2 on the second path 18. As a result, by using the pressing unit 23, the structure of the adjustment unit 19 can be simplified, thereby suppressing the occurrence of wrinkles in the medium 2. (4) In this embodiment, the adjustment unit 19 is disposed between the feed unit 8 and the processing unit 5 in the conveyance direction F. This allows the processing unit 5 to process the medium 2 in a state where the occurrence of wrinkles has been suppressed by the adjustment unit 19, thereby improving the processing quality.

[0046] (5) Furthermore, in this embodiment, a support portion 25 is provided that is disposed in an area facing the pressing portion 23 and can indirectly contact the pressing portion 23 by sandwiching the medium 2. This allows the portion of the medium 2 located on the first path 17 and the portion of the medium 2 located on the second path 18 to be positioned in the same position while being sandwiched between the pressing portion 23 and the support portion 25 from both the front surface Mf and the back surface Mb, thereby effectively suppressing the occurrence of wrinkles. Furthermore, in this embodiment, in the intersecting direction (Z-axis direction), position 27 where pressing portion 23 presses medium 2 against support portion 25 is between first position 28 where guide portion 26 contacts medium 2 and second position 29 where medium 2 is sandwiched between main roller 14 and sub-rollers 16, 16, 16, .... This makes it possible to keep small the amount of displacement of the portion of medium 2 that is pressed by pressing portion 23 and displaced in the pressing direction.

[0047] [Embodiment 2] Next, a medium conveying device 3 according to a second embodiment will be described with reference to Figures 7 and 8. The same parts as those in the first embodiment will be given the same reference numerals, and a description of the configurations and corresponding effects will be omitted. 7, in the medium conveying device 3 of this embodiment, the adjustment unit 19 is a pressing unit 23 that is disposed downstream of the sub-rollers 16, 16, 16, ... in the conveying direction F and presses the medium 2 from the side of the main roller 14 opposite to that of the first embodiment. The pressing unit 23 is disposed in a position that overlaps with the multiple sub-rollers 16, 16, 16, ... in the longitudinal direction (X-axis direction). Due to this arrangement, the pressing unit 23 is configured to press the medium 2 on the first path 17 with a pressing force P, unlike the first embodiment.

[0048] 7 and 8, in this embodiment, the medium conveying device 3 is provided with a support unit 25 that is disposed in an area facing the pressing unit 23 and can indirectly contact the pressing unit 23 by sandwiching the medium 2 therebetween. Furthermore, the medium conveying device 3 is provided with a guide unit 26 that is disposed downstream of the pressing unit 23 in the conveying direction F and that guides the conveyed medium 2. The pressing unit 23 is disposed so as to contact the back surface Mb of the medium 2, and the support unit 25 is disposed so as to contact the front surface Mf of the medium 2. In other words, this is the opposite of the first embodiment. As shown in Figure 7, in the intersecting direction (Z-axis direction) that intersects the conveying direction F and the longitudinal direction (X-axis direction), the position 27 where the pressing portion 23 presses the medium 2 against the support portion 26 is configured to be on a straight line 31 that connects a first position 28 where the guide portion 26 contacts the medium 2 and a vertex position 30 when the intersecting direction (Z-axis direction) of the main roller 14 is the height direction.

[0049] <Explanation of Effects of Embodiment 2> (1) In this embodiment, a pressing unit 23 is disposed downstream of the sub-rollers 16, 16, 16, ... in the conveying direction F, and presses the medium 2 from the main roller 14 side. Furthermore, the pressing unit 23 is disposed in a position overlapping with the multiple sub-rollers 16, 16, 16, ... in the longitudinal direction (X-axis direction), and presses the medium 2 on the first path 17. As a result, even by using the pressing unit 23 that presses the medium 2 from the main roller 14 side, the adjustment unit 19 can be realized with a simplified structure, thereby suppressing the occurrence of wrinkles in the medium 2.

[0050] (2) Furthermore, in this embodiment, a support portion 25 is provided that is disposed in an area facing the pressing portion 23 and can indirectly contact the pressing portion 23 by sandwiching the medium 2. This allows the portion of the medium 2 located on the first path 17 and the portion of the medium 2 located on the second path 18 to be positioned in the same position while being sandwiched between the pressing portion 23 and the support portion 25 from both the front surface Mf and the back surface Mb, thereby effectively suppressing the occurrence of wrinkles. Furthermore, in this embodiment, in the intersecting direction (Z-axis direction), position 27 where pressing portion 23 presses medium 2 against support portion 25 is on a straight line 31 connecting first position 28 where guide portion 26 contacts medium 2 and apex position 30 when the intersecting direction (Z-axis direction) of main roller 14 is the height direction. This makes it possible to keep small the amount of displacement of the portion of medium 2 that is pressed by pressing portion 23 and displaced in the pressing direction.

[0051] [Embodiment 3] Next, a medium conveying device 3 according to a third embodiment will be described with reference to Figures 5 and 6. The same parts as those in the first embodiment will be given the same reference numerals, and a description of the configurations and corresponding effects will be omitted. As shown in FIG. 5, in the medium conveying device 3 of this embodiment, the adjustment unit 19 is a suction unit 32 that is disposed downstream of the sub-rollers 16, 16, 16, ... in the conveying direction F and that sucks the medium 2 from the main roller 14 side. The suction unit 32 is disposed in a position that overlaps with a portion 24 between the multiple sub-rollers 16, 16, 16, ... in the longitudinal direction (X-axis direction). Due to this arrangement, the suction unit 32 is configured to suck the medium 2 in the second path 18 with a suction force A, as in the first embodiment. The magnitude of the suction force A is configured to be changeable and adjustable depending on the type and thickness of the medium 2.

[0052] 7 and 8, in this embodiment, the medium conveying device 3 is disposed in an area opposite the suction unit 32 and includes a support unit 25 that supports the medium 2 being conveyed. The support unit 25 is provided with a plurality of openings 33, 33, 33, ... at a position opposite the second path 18. Furthermore, the medium conveying device 3 is disposed downstream of the suction unit 32 in the conveying direction F and includes a guide unit 26 that guides the medium 2 being conveyed. The suction unit 32 is configured to suck the medium 2 on the second path 18 through the openings 33, 33, 33, .... As shown in Figure 5, in the conveying direction F and the transverse direction (Z-axis direction) that intersects with the longitudinal direction (X-axis direction), the position 34 at which the support portion 25 supports the medium 2 based on the suction force A of the suction portion 32 is configured to be between a first position 28 at which the guide portion 26 contacts the medium 2 and a second position 29 at which the medium 2 is clamped between the main roller 14 and the sub-rollers 16, 16, 16, ...

[0053] <Explanation of Effects of Embodiment 3> (1) In this embodiment, a suction unit 32 is disposed downstream of the sub-rollers 16, 16, 16, ... in the conveying direction F, and sucks the medium 2 from the main roller 14 side. Furthermore, the suction unit 32 is disposed in a position overlapping with a portion 24 between the multiple sub-rollers 16, 16, 16, ... in the longitudinal direction (X-axis direction), and sucks the medium 2 in the second path 18. As a result, even by using the suction unit 32 instead of the pressing unit 23, the adjustment unit 19 can be realized with a simplified structure, thereby suppressing the occurrence of wrinkles in the medium 2.

[0054] (2) In addition, in this embodiment, a support unit 25 is provided, which is disposed in an area opposite the suction unit 32 and supports the medium 2 being transported. Furthermore, the suction unit 32 suctions the medium 2 in the second path 18 through openings 33, 33, 33, ... provided in the support unit 25. This allows the portion of the medium 2 located in the first path 17 and the portion located in the second path 18 to be positioned in the same position while being sandwiched from both the front surface Mf and the back surface Mb by the suction unit 32 and the support unit 25, thereby effectively suppressing the occurrence of wrinkles. Furthermore, in this embodiment, in the intersecting direction (Z-axis direction), the position 34 at which the support portion 25 supports the medium 2 is between a first position 28 at which the guide portion 26 contacts the medium 2 and a second position 29 at which the medium 2 is sandwiched between the main roller 14 and the sub-rollers 16, 16, 16, .... This makes it possible to keep to a minimum the amount of displacement of the portion of the medium 2 that is sucked by the suction portion 32 and displaced in the suction direction.

[0055] [Embodiment 4] Next, a medium conveying device 3 according to a fourth embodiment will be described with reference to Figures 9 and 10. The same parts as those in the third embodiment will be given the same reference numerals, and a description of the configurations and corresponding effects will be omitted. 9, in the medium conveying device 3 of this embodiment, the adjustment unit 19 is disposed downstream of the sub-rollers 16, 16, 16, ... in the conveying direction F, and is a suction unit 32 that sucks the medium 2 from the side of the sub-rollers 16, 16, 16, ... opposite to that of embodiment 3. The suction unit 32 is disposed in a position overlapping with the multiple sub-rollers 16, 16, 16, ... in the longitudinal direction (X-axis direction). The suction unit 32 is configured to suck the medium 2 in the first path 17 with a suction force A, as in embodiment 2.

[0056] 9 and 10, in this embodiment, the medium conveying device 3 is disposed in an area opposite the suction unit 32 and includes a support unit 25 that supports the medium 2 being conveyed. The support unit 25 is provided with a plurality of openings 33, 33, 33, ... at a position opposite the first path 17. Furthermore, the medium conveying device 3 is disposed downstream of the suction unit 32 in the conveying direction F and includes a guide unit 26 that guides the medium 2 being conveyed. The suction unit 32 is configured to suck the medium 2 on the first path 17 through the openings 33, 33, 33, .... As shown in Figure 9, in the intersecting direction (Z-axis direction) that intersects the conveying direction F and the longitudinal direction (X-axis direction), the position 34 where the support section 25 supports the medium 2 based on the suction force A of the suction section 32 is configured to be on a straight line 31 connecting the first position 28 where the guide section 26 contacts the medium 2 and the vertex position 30 when the intersecting direction (Z-axis direction) of the main roller 14 is the height direction.

[0057] <Explanation of Effects of the Fourth Embodiment> (1) In this embodiment, a suction unit 32 is disposed downstream of the sub-rollers 16, 16, 16, ... in the conveying direction F, and sucks the medium 2 from the side of the sub-rollers 16, 16, 16, .... Furthermore, the suction unit 32 is disposed in a position overlapping with the multiple sub-rollers 16, 16, 16, ... in the longitudinal direction (X-axis direction), and sucks the medium 2 in the first path 17. As a result, even by using the suction unit 32 that sucks from the side of the sub-rollers 16, 16, 16, ... instead of the pressing unit 23, the adjustment unit 19 can be realized with a simplified structure, thereby suppressing the occurrence of wrinkles in the medium 2.

[0058] (2) In addition, in this embodiment, a support unit 25 is provided that is disposed in an area opposite the suction unit 32 and supports the medium 2 being transported. Furthermore, the suction unit 32 suctions the medium 2 in the first path 17 through openings 33, 33, 33, ... that are provided in the support unit 25. This allows the portion of the medium 2 located in the first path 17 and the portion located in the second path 18 to be positioned in the same position while being sandwiched from both the front surface Mf and the back surface Mb by the suction unit 32 and the support unit 25, thereby effectively suppressing the occurrence of wrinkles. Furthermore, in this embodiment, in the intersecting direction (Z-axis direction), the position 34 where the support portion 25 supports the medium 2 is on a straight line 31 that connects a first position 28 where the guide portion 26 contacts the medium 2 and an apex position 30 when the intersecting direction (Z-axis direction) of the main roller 14 is the height direction. This makes it possible to keep small the amount of displacement of the portion of the medium 2 that is sucked by the suction portion 32 and displaced in the suction direction.

[0059] [Embodiment 5] Next, a medium conveying device 3 according to a fifth embodiment will be described with reference to Figures 11 and 12. The same parts as those in the third embodiment will be given the same reference numerals, and a description of the configurations and corresponding effects will be omitted. 11 and 12, in the medium transport device 3 of this embodiment, the pressing unit 23 is a plurality of driven rollers 38, 38, 38, ... that rotate around the second shaft 37 and are arranged at intervals along the longitudinal direction of the main roller 14. The driven rollers 38, 38, 38, ... are arranged in positions that press the medium 2 on the second path 18. The adjustment unit 19 also includes a pair of parallel link mechanisms 40, 40 in which a first arm 41, a second arm 42, a third arm 43, and a fourth arm 44 are connected to form a parallelogram.

[0060] Each of the first arms 41, 41 constituting the pair of parallel link mechanisms 40, 40 is fixed to frames 45, 45 which are structural members of the medium transport device 3. The first arms 41, 41 and the fourth arms 44, 44 are arranged in parallel, and the second arms 42, 42 and the third arms 43, 43 are arranged in parallel. Both ends 151, 152 of the first shaft 15 are supported at connection portions 46, 46 between the second arms 42, 42 of the pair of parallel link mechanisms 40, 40 and the fourth arms 44, 44. Both ends 371, 372 of the second shaft 37 are supported at connection portions 47, 47 between the third arms 43, 43 of the pair of parallel link mechanisms 40, 40 and the fourth arms 44, 44. Furthermore, the second arms 42 are provided with elastic members 48 (FIG. 12) such as coil springs that apply elastic force in a direction pressing the sub-rollers 16 against the main roller 14. In FIG. 11, reference numerals 61 and 62 denote reinforcing members that reinforce the frames 45 to which the first arms 41 are fixed.

[0061] That is, in this embodiment, the adjustment unit 19 includes a pair of parallel link mechanisms 40, 40 in which four arms 41, 42, 43, 44 are connected to form a parallelogram. First arms 41, 41 of the parallel link mechanisms 40, 40 are fixed to frames 45, 45. Furthermore, both ends 151, 152 of the first shaft 15 are supported at connection portions 46, 46 with the fourth arms 44, 44 of the second arms 42, 42 of the pair of parallel link mechanisms 40, 40, and both ends 371, 372 of the second shaft 37 are supported at connection portions 47, 47 with the fourth arms 44, 44 of the third arms 43, 43 of the pair of parallel link mechanisms 40, 40. Furthermore, the second arms 42 are provided with elastic members 48 that apply elastic force in a direction pressing the sub-rollers 16, 16, 16, ... against the main roller 14.

[0062] <Explanation of Effects of Embodiment 5> When the thickness of the medium 2 conveyed by the conveying roller pair 10 changes, the sub-rollers 16, 16, 16, ... are displaced by the change in thickness of the medium 2 due to the elastic force of the elastic member 48. This displacement also displaces the first shaft 15. That is, the first shaft 15 supported at the connection portions 46, 46 between the second arms 42, 42 and the fourth arms 44, 44 is displaced. When the first shaft 15 is displaced, the second arms 42, 42 supporting the first shaft 15 rotate around a rotation fulcrum 49 at the connection portions with the first arms 41, 41 fixed to the frame 45. Due to this rotation, the third arms 43, 43 constituting the parallel link mechanisms 40, 40 also rotate around a rotation fulcrum 50 at the connection portions with the first arms 41, 41, similar to the second arms 42, 42. When the third arms 43, 43 rotate, the second shaft 37 also displaces. That is, the second shaft 37 supported at the connection portions 47, 47 between the third arms 43, 43 and the fourth arms 44, 44 is displaced. When the second shaft 37 is displaced, the driven rollers 38, 38, 38, ... supported on the second shaft 37 are also displaced. According to this embodiment, during each of the above-described displacements of the parallel link mechanisms 40, 40, the fourth arms 44, 44 are maintained parallel to the first arms 41, 41 fixed to the frame 45, so the first shaft 15 and the second shaft 37 are displaced equally in response to changes in the thickness of the medium 2. This allows the driven rollers 38, 38, 38, ... that form the pressing unit 19 to maintain a state in which they press the medium 2 on the second path 18.

[0063] Other Embodiments The recording device 1 and medium conveying device 3 according to the present invention are based on the configurations of the above-described embodiments, but it is of course possible to modify or omit partial configurations within the scope of the gist of the present invention. In the first to fourth embodiments, the medium transport device 3 has been described as having a structure including the support portion 25, but the support portion 25 does not necessarily have to be provided. Furthermore, if the first shafts 15 of the sub-rollers 16, 16, 16, ... are positioned vertically above the rotation shaft 22 of the main roller 14 and are not positioned offset in the conveying direction F, the guide portion 26 does not need to be provided. Furthermore, in each embodiment, the medium 2 has been described as being made of fabric, but it may be paper such as plain paper instead of fabric. [Explanation of symbols]

[0064] 1... recording device, 2... medium, 3... medium conveying device, 4... conveying path, 5... processing section 6...heating section, 7...winding section, 8...unwinding section, 9...unwinding shaft, 10...conveying roller pair, 11... intermediate roller, 12... guide bar, 13... winding shaft, 14... main roller, 15...first shaft, 16...sub-roller, 17...first path, 18...second path, 19...adjustment unit, 20...portion located in the first path of the medium, 21...portion located in the second path of the medium, 22...rotation shaft, 23...pressure portion, 24...portion between a plurality of sub-rollers, 25...support portion, 26...guide portion, 27...position where the pressing portion 23 presses the medium, 28...first position, 29...second position, 30...vertex position, 31...connecting straight line, 32...suction portion, 33...opening, 34...position where the support portion supports the medium, 37...second axis, 38... driven roller, 40... parallel link mechanism, 41... first arm, 42...second arm, 43...third arm, 44...fourth arm, 45...frame, 46...connection portion, 47...connection portion, 48...elastic member, 49...rotation fulcrum, 50...Pivot fulcrum, 51...Recording unit, 61...Reinforcing member, 62...Reinforcing member, 151...End portion, 152...end portion, 371...end portion, 372...end portion, A...suction force, F...conveying direction, Mf...front surface, Mb...back surface, P...pressure, R1...roll body, R2...roll body

Claims

1. a conveying roller pair including a main roller that applies a feed force to the medium in the conveying direction, and a plurality of sub-rollers that rotate around a first axis while sandwiching the medium between the main roller and the pair of main rollers and are arranged at intervals along the longitudinal direction of the main roller; a first path is a path along which the medium is sandwiched between the main roller and the plurality of sub-rollers and transported, and a second path is a path along which the medium is transported in contact with the main roller but not in contact with the plurality of sub-rollers; and an adjustment unit that adjusts a path difference between the first path and the second path. Media transport device.

2. 2. The medium transport device according to claim 1, The first shaft of the sub-roller is disposed so as to be shifted in the conveying direction with respect to the rotation shaft of the main roller. A medium transport device characterized by:

3. 2. The medium transport device according to claim 1, the adjustment unit is a pressing unit that is disposed downstream of the sub-roller in the transport direction and presses the medium from the sub-roller side, the pressing portion is disposed at a position overlapping with a portion between the plurality of sub-rollers in the longitudinal direction and presses the medium on the second path. A medium transport device characterized by:

4. 2. The medium transport device according to claim 1, the adjustment unit is a suction unit that is disposed downstream of the sub-roller in the transport direction and that suctions the medium from the main roller side, the suction unit is disposed at a position overlapping with a portion between the plurality of sub-rollers in the longitudinal direction, and suctions the medium in the second path. A medium transport device characterized by:

5. 2. The medium transport device according to claim 1, the adjustment unit is a pressing unit that is disposed downstream of the sub-roller in the transport direction and presses the medium from the main roller side, the pressing unit is disposed at a position overlapping with the plurality of sub-rollers in the longitudinal direction and presses the medium on the first path. A medium transport device characterized by:

6. 2. The medium transport device according to claim 1, the adjustment unit is a suction unit that is disposed downstream of the sub roller in the transport direction and that suctions the medium from the sub roller side, the suction unit is disposed at a position overlapping with the plurality of sub-rollers in the longitudinal direction and sucks the medium in the first path; A medium transport device characterized by:

7. 2. The medium transport device according to claim 1, a feeding unit that is disposed upstream of the pair of transport rollers in the transport direction and that feeds out the medium wound in a roll; a take-up unit that is disposed downstream of the pair of transport rollers in the transport direction and that takes up the medium being transported; a processing unit that is disposed between the feeding unit and the winding unit and that processes the medium being transported, The adjustment unit is disposed at a position between the feeding unit and the processing unit. A medium transport device characterized by:

8. 4. The medium transport device according to claim 3, a support portion that is disposed in an area facing the pressing portion and that can indirectly contact the pressing portion with the medium sandwiched therebetween; a guide unit that is disposed downstream of the pressing unit in the transport direction and that guides the medium being transported, a position where the pressing portion presses the medium against the support portion in a direction intersecting the transport direction and the longitudinal direction, the position being between a first position where the guide portion contacts the medium and a second position where the medium is sandwiched between the main roller and the sub-roller; A medium transport device characterized by:

9. 6. The medium transport device according to claim 5, a support portion that is disposed in an area facing the pressing portion and that can indirectly contact the pressing portion with the medium sandwiched therebetween; a guide unit that is disposed downstream of the pressing unit in the transport direction and that guides the medium being transported, In a cross direction that crosses the transport direction and the longitudinal direction, the position at which the pressing portion presses the medium against the support portion is on a straight line that connects a first position at which the guide portion contacts the medium and a vertex position of the main roller when the cross direction of the main roller is defined as a height direction. A medium transport device characterized by:

10. 5. The medium transport device according to claim 4, a support portion that is disposed in an area facing the suction portion and supports the medium being transported; a plurality of openings provided in the support portion at positions facing the second path; a guide unit that is disposed downstream of the suction unit in the transport direction and that guides the medium being transported, the suction unit suctions the medium in the second path through the opening, In a direction intersecting the transport direction and the longitudinal direction, a position at which the support portion supports the medium is between a first position at which the guide portion contacts the medium and a second position at which the medium is sandwiched between the main roller and the sub-roller. A medium transport device characterized by:

11. 7. The medium transport device according to claim 6, a support portion that is disposed in an area facing the suction portion and supports the medium being transported; a plurality of openings provided in the support portion at positions facing the first path; a guide unit that is disposed downstream of the suction unit in the transport direction and that guides the medium being transported, the suction unit suctions the medium in the first path through the opening, In an intersecting direction intersecting the transport direction and the longitudinal direction, a position where the support portion supports the medium is on a straight line connecting a first position where the guide portion contacts the medium and a vertex position of the main roller when the intersecting direction is defined as a height direction. A medium transport device characterized by:

12. 4. The medium transport device according to claim 3, the pressing unit is a plurality of driven rollers that rotate around a second shaft and are arranged at intervals along the longitudinal direction of the main roller, the adjustment unit includes a pair of parallel link mechanisms in which a first arm, a second arm, a third arm, and a fourth arm are connected to form a parallelogram, the first arm is fixed to a frame; the first arm and the fourth arm are arranged in parallel, the second arm and the third arm are arranged in parallel, both ends of the first shaft are supported at connection portions of the second arms of the pair of parallel link mechanisms with the fourth arms, both ends of the second shaft are supported at connection portions of the third arms of the pair of parallel link mechanisms with the fourth arms, The second arm is provided with an elastic member that applies an elastic force in a direction that presses the sub-roller against the main roller. A medium transport device characterized by:

13. a recording unit that records on the medium; a medium transport device that transports the medium toward a recording unit, The medium transport device is a conveying roller pair including a main roller that applies a feed force to the medium in the conveying direction, and a plurality of sub-rollers that rotate around a first axis while sandwiching the medium between the main roller and the pair of main rollers and are arranged at intervals along the longitudinal direction of the main roller; a first path is a path along which the medium is sandwiched between the main roller and the plurality of sub-rollers and transported, and a second path is a path along which the medium is transported in contact with the main roller but not in contact with the plurality of sub-rollers; and an adjustment unit that adjusts a path difference between the first path and the second path. Recording device.

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