Medium conveying device and recording device

Abstract

To suppress occurrence of wrinkles caused by unbalanced loads.SOLUTION: A medium conveying device comprises: a feeding part that feeds out a cloth; a main roller that applies feeding force toward a conveying direction to the cloth; three or more sub rollers 161, 162 and 163 that rotate around a shaft while gripping the cloth in pair with the main roller and are arranged with an interval from each other along a longitudinal direction (X-axis direction) of the main roller; a support unit that supports the shaft; and a pressing force generating part that generates pressing force P for pressing the sub rollers against the main roller. The pressing force generating part makes an adjusting part, which adjusts pressing force P1, P2 and P3 of the sub rollers against the main roller so that the force become equal, generate the pressing force P1, P2 and P3.SELECTED DRAWING: Figure 4

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 upper paper guide unit holds three driven rollers. The shafts of the three driven rollers receive the elastic force of a coil spring via bearings at both ends of the shaft, and also receive the elastic force of a coil spring directly at the middle portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-44272 Summary of the Invention [Problem to be solved by the invention]

[0004] The central driven roller of the three is subjected to the elastic forces of both coil springs on both sides, so it experiences a greater load than the driven rollers at the left and right ends. If a difference in load occurs between the central driven roller and the left and right driven rollers, it will result in an uneven load, causing a difference in the conveying force within the unit and between adjacent units. If the medium has a flat structure, such as paper, it is unlikely to deform even if there is a difference in conveying force. However, if the medium has a three-dimensional structure, such as fabric, formed by weaving or knitting threads, the difference in conveying force can cause the fabric to stretch or deform, easily causing wrinkles. In other words, there is room for improvement in suppressing the occurrence of wrinkles due to the uneven load on each driven roller. [Means for solving the problem]

[0005] In order to solve the above problem, the media transport device of the present invention comprises a feed section that feeds out fabric, a main roller that applies a feed force to the fabric in the transport direction, three or more sub-rollers that rotate around an axis while paired with the main roller to clamp the fabric and are arranged in sequence at intervals along the longitudinal direction of the main roller, a support unit that supports the axis, and a pressing force generating section that generates a pressing force to press the sub-rollers against the main roller, wherein the pressing force generating section generates each pressing force using an adjustment section that adjusts the pressing forces of each sub-roller against the main roller in a direction so that they are uniform.

[0006] Moreover, the recording device according to the present invention comprises a payout unit that pays out fabric, a main roller that applies a feed force to the fabric in the transport direction, three or more sub-rollers that rotate around an axis while paired with the main roller to clamp the fabric and are arranged in sequence at intervals along the longitudinal direction of the main roller, a support unit that supports the axis, a pressing force generating unit that generates a pressing force to press the sub-rollers against the main roller, and a recording unit that performs recording on the medium being transported, wherein the pressing force generating unit generates each pressing force using an adjustment unit that adjusts the pressing forces of each sub-roller against the main roller in a direction so that they are uniform. [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 side view of a recording apparatus according to a first embodiment. [Figure 3] FIG. 2 is a perspective view of a main part of the medium conveying device according to the first embodiment. [Figure 4] FIG. 2 is an enlarged perspective view of a main part of the first embodiment. [Figure 5] FIG. 2 is an enlarged front view of a main part of the first embodiment. [Figure 6] FIG. 10 is an enlarged perspective view of a main part of a second embodiment. [Figure 7] FIG. 10 is an enlarged front view of the main part of the second and third embodiments. 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 feed section that feeds out fabric, a main roller that applies a feed force to the fabric in the transport direction, three or more sub-rollers that rotate around an axis while paired with the main roller to clamp the fabric and are arranged in sequence at intervals along the longitudinal direction of the main roller, a support unit that supports the axis, and a pressing force generating section that generates a pressing force to press the sub-rollers against the main roller, wherein the pressing force generating section generates each pressing force using an adjustment section that adjusts the pressing forces of each sub-roller against the main roller in a direction so that they are uniform. Here, "each pressing force becomes uniform" in "by an adjustment unit that adjusts each pressing force in the direction of becoming uniform" does not mean that each pressing force of each sub-roller needs to be exactly the same, but rather that the difference between each pressing force is smaller than in a state where there is no adjustment by the adjustment unit.

[0009] According to this aspect, the fabric conveying device includes a pressing force generating unit that generates a pressing force to press the sub-roller against the main roller, and the pressing force generating unit is configured to generate the pressing forces by an adjusting unit that adjusts the pressing forces of the sub-rollers against the main roller so that they become uniform. That is, the adjusting unit adjusts the pressing forces of the sub-rollers against the main roller so that they become uniform. This makes it possible to suppress wrinkles caused by deformation of the fabric texture due to uneven loads on the sub-rollers.

[0010] A medium conveying device according to a second aspect of the present invention is an aspect dependent on the first aspect, characterized in that the support unit supports the shaft in a fixed state and is swingable, the adjustment unit has an elastic member that applies an elastic force to the support unit in the direction of the swing, and each of the pressing forces is generated by the elastic member.

[0011] According to this aspect, the adjustment unit is configured to generate the pressing forces by elastic members that apply elastic force to the swingable support unit in a swing direction, thereby making it possible to suppress the occurrence of wrinkles due to uneven loads on the sub-rollers with a simple structure.

[0012] A medium conveying device according to a third aspect of the present invention is an aspect dependent on the second aspect, and is characterized in that the multiple sub-rollers each have an independent axis, and each axis is independently fixed to the support unit.

[0013] According to this aspect, the shafts of the sub-rollers are independent of each other. Furthermore, each shaft is independently fixed to the support unit. This further reduces the occurrence of wrinkles due to uneven loads on the sub-rollers.

[0014] A medium transport device according to a fourth aspect of the present invention is an aspect dependent on the first aspect, in which the multiple sub-rollers are attached to a common shaft, the shaft is supported by the support unit so as to be movable in the direction of the pressing force, the adjustment unit has multiple pressing units that press the portions of the shaft between each sub-roller with the same pressing force, and the multiple sub-rollers located at both ends of the shaft are end-position sub-rollers of a first weight, and the ones located between the end-position sub-rollers are intermediate-position sub-rollers of a second weight that is lighter than the first weight, and the pressing forces are generated by the same pressing force and the weight difference between the first weight and the second weight.

[0015] According to this aspect, the multiple pressing units press the areas between the sub-rollers with the same pressing force. Furthermore, the multiple sub-rollers include end-position sub-rollers of a first weight located at both ends of the shaft, and intermediate-position sub-rollers of a second weight located between the end-position sub-rollers and lighter than the first weight. The pressing force is generated by the same pressing force and the weight difference between the first weight and the second weight. This makes it possible to prevent wrinkles from occurring due to uneven loads on the sub-rollers.

[0016] A media transport device according to a fifth aspect of the present invention is an aspect dependent on the first aspect, in which the multiple sub-rollers are attached to a common shaft, the shaft is supported by the support unit so as to be movable in the direction of the pressing force, the adjustment unit has multiple pressing units that press the portions of the shaft between each of the sub-rollers with the same pressing force, and the multiple sub-rollers located at both ends of the shaft are end-position sub-rollers with a first hardness, and the multiple sub-rollers located between each of the end-position sub-rollers are intermediate-position sub-rollers with a second hardness lower than the first hardness, and the pressing forces are generated by the same pressing force and the hardness difference between the first hardness and the second hardness.

[0017] According to this aspect, the multiple pressing units press the areas between the sub-rollers with the same pressing force. Furthermore, the multiple sub-rollers include end-position sub-rollers with a first hardness located at both ends of the shaft, and intermediate-position sub-rollers with a second hardness lower than the first hardness located between the end-position sub-rollers. The pressing force is generated by the same pressing force and the difference in hardness between the first and second hardnesses. This makes it possible to prevent wrinkles from occurring due to uneven loads on the sub-rollers.

[0018] A media conveying device according to a sixth aspect of the present invention is an aspect dependent on the first aspect, and is characterized in that it comprises a winding section that winds up the fabric being conveyed in the conveying direction, and a processing section that is positioned between the unwinding section and the winding section and processes the fabric being conveyed, and the sub-roller is positioned between the unwinding section and the processing section in the conveying direction.

[0019] According to this aspect, the sub-roller is disposed between the feeding section and the processing section in the conveyance direction, thereby enabling the processing of the fabric by the processing section to be performed in a state in which the occurrence of wrinkles is suppressed.

[0020] A recording device according to a seventh aspect of the present invention comprises a payout unit that pays out fabric, a main roller that applies a feed force to the fabric in the conveying direction, three or more sub-rollers that rotate around an axis while paired with the main roller to clamp the fabric and are arranged in sequence at intervals along the longitudinal direction of the main roller, a support unit that supports the axis, a pressing force generating unit that generates a pressing force to press the sub-rollers against the main roller, and a recording unit that performs recording on the fabric as it is conveyed, wherein the pressing force generating unit generates each pressing force using an adjustment unit that adjusts the pressing forces of each sub-roller against the main roller in a direction so that they are uniform. According to this aspect, the recording device can achieve the same effects as the first aspect.

[0021] [Embodiment] Hereinafter, an embodiment of a medium transport device according to the present invention and a recording device including the medium transport device 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.

[0022] <Overall overview of the recording device> As shown in FIGS. 1 and 2, the recording apparatus 1 of this embodiment is a digital textile printing machine in which the recording medium is a fabric 2. The fabric 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 known as a roll-to-reel transport method to apply appropriate tension to the fabric 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 by the recording unit 51, the fabric 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.

[0023] 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 conveying device 3 is conveyed by a pair of conveying rollers 10 and an intermediate roller 11 that constitute a conveyance path 4 so as to pass through a recording area of ​​the recording unit 51. After recording by the recording unit 51, the medium 2 is further conveyed by the intermediate roller 11 and a guide bar 12 through a heating area of ​​the heating unit 6. After passing through the guide bar 12, the medium 2 is taken up onto the roll R2, which is supported on a take-up shaft 13 of the take-up unit 7. The take-up shaft 13 is driven to rotate by rotational power transmitted from a drive source (not shown), causing the roll R2 to rotate in the take-up direction.

[0024] [Embodiment 1] <Media transport device> The medium conveying device 3 according to the first embodiment will be described below with reference to FIGS. The medium conveying device 3 of this embodiment includes a payout unit 8 that pays out the fabric 2, and a conveying roller pair 10 that applies a feeding force to the fabric 2 in the conveying direction F. The conveying roller pair 10 is composed of a main roller 14, which is a drive roller that rotates when a driving force is transmitted, and a sub-roller 16, which is a driven roller. In other words, the sub-roller 16 is a driven roller that rotates around an axis 15 while sandwiching the fabric 2 between itself and the main roller 14. As shown in Figure 2, in this embodiment, the transport roller pair 10, i.e., the roller pair of the sub-roller 16 and the main roller 14, is arranged at a position between the payout section 8 and the recording section 51, which is the processing section 5, in the transport direction F.

[0025] 3 and 4, in this embodiment, the sub-roller 16 is made up of three sub-rollers 161, 162, and 163 that are spaced apart from one another and aligned in sequence along the longitudinal direction (X-axis direction) of the main roller 14. The three sub-rollers 161, 162, and 163 are rotatably attached to a shaft 15. The shaft 15 is fixedly attached to a shaft fixing portion 18 of the support unit 17. That is, one support unit 17 rotatably supports three sub-rollers 161, 162, and 163 via shaft 15. As shown in FIG. 3, a plurality of support units 17 are arranged side by side in the X-axis direction, and a sub-roller 16 and a main roller 14 form a pair to constitute a transport roller pair 10. The number of sub-rollers 16 supported by one support unit 17 is not limited to three, and may be four or more.

[0026] Furthermore, the medium transport device 3 of this embodiment includes a pressing force generating unit 19 that generates a pressing force P (FIG. 4) that presses the sub-roller 16 against the main roller 14. The pressing force generating unit 19 includes an adjusting unit 20 that adjusts the pressing forces P1, P2, and P3 of the sub-rollers 161, 162, and 163 against the main roller 14 in a direction that makes them uniform. That is, the adjusting unit 20 is configured to adjust the pressing forces P1, P2, and P3 of the sub-rollers 161, 162, and 163 in a direction that makes them uniform. Here, "the pressing forces P1, P2, P3 become uniform" in "by the adjustment unit that adjusts in the direction that the pressing forces P1, P2, P3 become uniform" does not mean that the pressing forces P1, P2, P3 of the sub-rollers 161, 162, 163 need to be exactly the same, but it is sufficient that the difference between the pressing forces P1, P2, P3 is smaller than in a state where there is no adjustment by the adjustment unit 20.

[0027] In this embodiment, in order to enable the adjustment by the adjustment unit 20, the support unit 17 is configured to be swingable via a swing fulcrum 21 (FIG. 4). The swing fulcrum 21 is provided on the support unit 17. The swing fulcrum 21 is journaled on a bearing (not shown) provided on a frame 22 (FIG. 3), which is a structural member of the medium transport device 3. This allows the support unit 17 to swing about an axis L (FIG. 4) that is parallel to the X-axis and passes through the swing fulcrum 21. In other words, the support unit 17 can swing the sub-roller 16 in a direction that moves it closer to and away from the main roller 14.

[0028] 4, the adjustment unit 20 includes an elastic member 23. The elastic member 23 is configured to apply an elastic force E to the support unit 17 in a direction R that causes the support unit 17 to swing. Here, the elastic member 23 is configured as a tension spring, but it is not limited to a tension spring, and a compression spring or the like can also be used. The elastic member 23 has one end 24 hooked to a base end 25 of the support member 17 on the side opposite to the sub-roller 16 and the other end 26 hooked to the frame 22 .

[0029] That is, in this embodiment, pressing force generating section 19 causes swingable support unit 17 to swing about swing fulcrum 21 by elastic force E of elastic member 23 constituting adjustment section 20, and moves shaft 15 fixed to shaft fixing section 18 of support unit 17 in the direction of pressing force P, which is a direction approaching main roller 14. As a result, each of sub-rollers 161, 162, 163 supported by shaft 15 is pressed against main roller 14, generating each of pressing forces P1, P2, P3. Each of pressing forces P1, P2, P3 is configured to be approximately uniform because shaft 15 is fixed to shaft fixing section 18 of support unit 17 as described above. That is, unlike the conventional structure in which the elastic force of a coil spring acts on the shaft 15 at both sides of each sub-roller 161, 162, 163 in the longitudinal direction (X-axis direction), each pressing force P1, P2, P3 is generated through oscillation based on the elastic force E of the elastic member 23 of the support unit 17, and is therefore approximately uniform as described above.

[0030] 5, in this embodiment, the shafts 15 of the multiple sub-rollers 161, 162, and 163 are configured as independent shafts 151, 152, and 153. That is, the shafts 151, 152, and 153 are independently fixed to the shaft fixing portions 18 of the support unit 17. In other words, the multiple sub-rollers 161, 162, and 163 are rotatably attached to the separate shafts 151, 152, and 153 rather than to a single common shaft 15. In this embodiment, the shaft 15 may be configured as one common shaft, but it is preferable that the shaft 15 is configured as separate shafts 151, 152, and 153 as described above.

[0031] <Explanation of Effects of First Embodiment> (1) In this embodiment, the sub-roller 16 is provided with a pressing force generating unit 19 that generates a pressing force P that presses the sub-roller 16 against the main roller 14. The pressing force generating unit 19 is configured to generate the pressing forces P1, P2, and P3 using an adjusting unit 20 that adjusts the pressing forces P1, P2, and P3 of the sub-rollers 161, 162, and 163 against the main roller 14 in a direction that makes them uniform. In other words, the adjusting unit 20 adjusts the pressing forces P1, P2, and P3 of the sub-rollers 161, 162, and 163 against the main roller 14 in a direction that makes them uniform. This makes it possible to suppress the occurrence of wrinkles that occur due to deformation of the texture of the fabric 2 caused by uneven loads on the sub-rollers.

[0032] (2) In this embodiment, the adjustment unit 20 is configured to generate the pressing forces P1, P2, and P3 by the elastic member 23 that applies an elastic force E to the swingable support unit 17 in the swing direction R. This makes it possible to suppress the occurrence of wrinkles due to the uneven load on the sub-rollers 161, 162, and 163 with a simple structure. (3) In this embodiment, the shafts 15 of the multiple sub-rollers 161, 162, and 163 are independent of each other. Furthermore, the shafts 151, 152, and 153 are independently fixed to the support unit 17. This further reduces the occurrence of wrinkles due to uneven loads on the sub-rollers 161, 162, and 163.

[0033] (4) In this embodiment, the sub-rollers 161, 162, and 163 are disposed between the unwinding unit 8 and the processing unit 5 in the conveying direction F. This allows the processing of the fabric 2 by the processing unit 5 to be performed in a state where the occurrence of wrinkles is suppressed.

[0034] [Embodiment 2] Next, a medium conveying device 3 according to a second embodiment will be described with reference to Figures 6 and 7. 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, three sub-rollers 161, 162, and 163 are attached to a single common shaft 15. Both longitudinal ends of the shaft 15 are movably supported by the support unit 17. The movable direction of the shaft 15 is the direction of the pressing force P, which is the direction approaching the main roller 14 (Z-axis direction). The number of sub-rollers 16 supported by one support unit 17 is not limited to three, and may be four or more.

[0035] The adjustment unit 20 includes two pressing units 33 and 34 that press two portions 31 and 32 between the sub-rollers 161, 162, and 163 on the shaft 15. The pressing forces Q of the pressing units 33 and 34 are set to the same magnitude. Furthermore, the adjustment unit 20 includes end-position sub-rollers 16S and 16S of the three sub-rollers 161, 162, and 163, each having a first weight W1 and located at both ends of the shaft 15, and an intermediate-position sub-roller 16M located between the end-position sub-rollers 16S and 16S and having a second weight W2 that is lighter than the first weight W1. That is, the weights of the three sub-rollers 161, 162, and 163 are different. The first weight W1, which is the weight of the two end-position sub-rollers 16S and 16S, is configured to be heavier than the second weight W2, which is the weight of the intermediate-position sub-roller 16M. The pressing forces P1, P2, P3 are configured to be uniform by adjusting the pressing force Q of the pressing portions 33, 34 and the weight difference (W1-W2) between the first weight W1 and the second weight W2.

[0036] That is, in this embodiment, the pressing force generating unit 19 presses the two portions 31 and 32 between the sub-rollers 161, 162, and 163 on the common shaft 15, with the same pressing force Q. In this state, if the weights of the sub-rollers 161, 162, and 163 are the same, an unbalanced load occurs as in the conventional case. However, in this embodiment, the weight difference (W1-W2) between the first weight W1 and the second weight W2 reduces the unbalanced load, and the pressing forces P1, P2, and P3 of the sub-rollers 161, 162, and 163 against the main roller 14 are adjusted to be uniform.

[0037] In this embodiment, the multiple pressing units 33 and 34 press the portions 31 and 32 between the sub-rollers 161, 162, and 163 with the same pressing force Q. Furthermore, the multiple sub-rollers 161, 162, and 163 include end-position sub-rollers 16S and 16S with a first weight W1 located at both ends of the shaft 15, and an intermediate-position sub-roller 16M with a second weight W2 located between the end-position sub-rollers 16S and 16S and lighter than the first weight W1. The same pressing force Q and the weight difference (W1-W2) between the first weight W1 and the second weight W2 generate pressing forces P1, P2, and P3. This prevents the occurrence of wrinkles due to the uneven load on the sub-rollers 161, 162, and 163.

[0038] [Embodiment 3] Next, a medium conveying device 3 according to a third embodiment will be described with reference to Figures 6 and 7. The same parts as those in the first and second embodiments are given the same reference numerals, and a description of the configurations and corresponding effects will be omitted. 7, this embodiment includes end-position sub-rollers 16S, 16S of the multiple sub-rollers 161, 162, 163, each of which has a first hardness H1 and is located at both ends of the shaft 15, and an intermediate-position sub-roller 16M, which is located between the end-position sub-rollers 16S, 16S and has a second hardness H2 lower than the first hardness H1. That is, the hardnesses of the three sub-rollers 161, 162, 163 are different. The first hardness H1, which is the hardness of the two end-position sub-rollers 16S, 16S, is configured to be greater than the second weight H2, which is the weight of the intermediate-position sub-roller 16M. The pressing forces P1, P2, and P3 are adjusted to be uniform by the same pressing force Q of the pressing portions 33 and 34 and the hardness difference (H1-H2) between the first hardness H1 and the second hardness H2. The other configurations are the same as those of the second embodiment.

[0039] In this embodiment, the multiple pressing portions 33, 34 press the portions 31, 32 between the sub-rollers 161, 162, 163 with the same pressing force Q. Furthermore, the sub-rollers 161, 162, 163 include end-position sub-rollers 16S, 16S with a first hardness H1 located at both ends of the shaft 15, and intermediate-position sub-rollers 16M with a second hardness H2 lower than the first hardness H1 located between the end-position sub-rollers 16S, 16S. The pressing forces P1, P2, P3 are generated by the same pressing force Q and the hardness difference (H1-H2) between the first hardness H1 and the second hardness H2. This prevents wrinkles from occurring due to uneven loads on the sub-rollers 161, 162, 163.

[0040] Other Embodiments The recording device 1 and medium conveying device 3 according to the present invention are based on the configuration of the embodiment described above, but it is of course possible to modify or omit partial configurations within the scope of the gist of the present invention. [Explanation of symbols]

[0041] 1... recording device, 2... fabric, 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...shaft, 16, 161, 162, 163...sub-rollers, 16S...end position sub-roller, 16M... intermediate position sub-roller, 17... support unit, 18... shaft fixing part, 19... pressing force generating portion, 20... adjusting portion, 21... swing fulcrum, 22... frame, 23...elastic member, 24...one end, 25...base end, 26...other end, 31...portion therebetween, 32...intermediate portion, 33...pressing portion, 34...pressing portion, 51...recording portion, F...conveying direction, H1...first hardness, H2...second hardness, P,P1,P2,P3...pushing force, Q...pushing force, R...swing direction, R1...roll body, R2...roll body, W1...first weight, W2: Second weight

Claims

1. a payout section that pays out the fabric; a main roller that applies a feeding force to the fabric in a conveying direction; three or more sub-rollers that rotate around an axis while being paired with the main roller and holding the fabric therebetween, and that are arranged in order at intervals along the longitudinal direction of the main roller; a support unit for supporting the shaft; a pressing force generating unit that generates a pressing force that presses the sub-roller against the main roller, the pressing force generating unit generates the pressing forces by an adjusting unit that adjusts the pressing forces of the sub-rollers against the main roller in a direction such that the pressing forces are uniform. A medium transport device characterized by:

2. 2. The medium transport device according to claim 1, the support unit supports the shaft in a fixed state and is swingable; The adjustment unit an elastic member that applies an elastic force to the support unit in the swing direction; The pressing forces are generated by the elastic members. A medium transport device characterized by:

3. 3. The medium transport device according to claim 2, The plurality of sub-rollers are Each axis is independent, Each of the shafts is independently fixed to the support unit. A medium transport device characterized by:

4. 2. The medium transport device according to claim 1, The plurality of secondary rollers are mounted on a common shaft; the shaft is supported by the support unit so as to be movable in the direction of the pressing force, The adjustment unit a plurality of pressing portions that press portions of the shaft between the sub-rollers with the same pressing force; Among the plurality of sub-rollers, those located at both ends of the shaft are defined as end position sub-rollers of a first weight, and those located between the end position sub-rollers are defined as intermediate position sub-rollers of a second weight lighter than the first weight, The pressing forces are generated by the same pressing force and a weight difference between the first weight and the second weight. A medium transport device characterized by:

5. 2. The medium transport device according to claim 1, The plurality of secondary rollers are mounted on a common axle; the shaft is supported by the support unit so as to be movable in the direction of the pressing force, The adjustment unit a plurality of pressing portions that press portions of the shaft between the sub-rollers with the same pressing force; Among the plurality of sub-rollers, those located at both ends of the shaft are defined as end-position sub-rollers having a first hardness, and those located between the end-position sub-rollers are defined as intermediate-position sub-rollers having a second hardness lower than the first hardness, The pressing forces are generated by the same pressing force and a hardness difference between the first hardness and the second hardness. A medium transport device characterized by:

6. 2. The medium transport device according to claim 1, a winding section that winds up the fabric transported in the transport direction; a processing section disposed between the unwinding section and the winding section, for processing the fabric being transported; the sub-roller is disposed at a position between the feeding section and the processing section in the conveying direction. A medium transport device characterized by:

7. a payout section that pays out the fabric; a main roller that applies a feeding force to the fabric in a conveying direction; three or more sub-rollers that rotate around an axis while being paired with the main roller and holding the fabric therebetween, and that are arranged in order at intervals along the longitudinal direction of the main roller; a support unit for supporting the shaft; a pressing force generating unit that generates a pressing force that presses the sub-roller against the main roller; a recording unit that performs recording on the fabric being conveyed, the pressing force generating unit generates the pressing forces by an adjusting unit that adjusts the pressing forces of the sub-rollers against the main roller in a direction such that the pressing forces are uniform. A recording device characterized by:

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