JP2020164314A - Conveyance device and image formation device - Google Patents

Abstract

To provide a conveyance device comprising a pair of conveyance rollers capable of conveying paper sheets different in thickness and stiffness with an appropriate pressing force.SOLUTION: A conveyance device comprises: conveyance rollers 35 having a first roller 31 and a second roller 33 to form a nip part for holding a paper sheet; a support unit 37 which supports the first roller 31 so as to displace with respect to the second roller 33 in a thickness direction of the paper sheet; and a pressing member 39 which is provided to the support unit 37 for pressing the first roller 31 against the second roller 33. The pressing member 39 comprises: a first spring 75A which is compressed in a state where the first roller 31 is brought into contact with the second roller 33 to generate a pressing force; and a second spring 75B which is compressed by separating the first roller 31 from the second roller 33 by a first interval or more to generate the pressing force.SELECTED DRAWING: Figure 2

Description

The present invention relates to a transport device and an image forming device including a pair of transport rollers for transporting paper.

The transport roller pair generally includes a drive roller that is driven and rotates, and a driven roller that is pressed by the drive roller by a spring, and the rotation of both rollers transports the paper sandwiched between the rollers. It has become so. The paper transport force by the transport roller pair is obtained by the pressing force (spring pressure) of the driven roller against the drive roller, and the optimum pressure of the spring changes depending on the paper thickness.

If the spring pressure is constant regardless of the thickness of the paper, the following problems occur. If the spring pressure is set relatively weak to suit thin or plain paper, sufficient pressure will not be obtained for thick paper and the paper will slip. On the contrary, when the spring pressure is set relatively strong so as to be suitable for thick paper, the pressure is too high in the case of thin paper or plain paper, and roller streaks are generated.

Patent Document 1 describes a sheet processing device configured so that the pressure contact force of a pair of discharge rollers becomes stronger only when the sheet is conveyed. Further, the sheet folding device described in Patent Document 2 is provided with a pressure adjusting roller that adjusts the pressing force according to the folding mode (folding in half, folding in four, etc.).

Japanese Unexamined Patent Publication No. 2001-39612 Japanese Unexamined Patent Publication No. 2011-143075

However, the sheet processing apparatus of Patent Document 1 is not configured so that the pressure contact force is set according to the thickness of the paper. Further, in the sheet folding device of Patent Document 2, when the folding mode is selected, the pressure adjusting roller is rotated so that the pressing force is applied according to the selected folding mode. That is, it is necessary to input the thickness of the paper in advance.

In consideration of the above circumstances, it is an object of the present invention to provide a transport device and an image forming device provided with a pair of transport rollers capable of transporting papers having different thicknesses and stiffnesses with an appropriate pressing force.

In order to solve the above problems, the transport device of the present invention has a transport roller having a first roller and a second roller to form a nip portion in which paper is sandwiched, and the first roller is used as the second roller. On the other hand, a support unit that supports the paper so as to be displaceable in the thickness direction of the paper and a pressing member provided on the support unit that presses the first roller against the second roller are provided. The first spring, which is compressed in a state where the first roller is in contact with the second roller to generate a pressing force, and the first roller are compressed by being separated from the second roller by a first interval or more. It is characterized in that it is provided with a second spring that generates a pressing force.

In the transport device of the present invention, the first roller is separated from the second roller against the pressing force of the pressing member according to the thickness of the paper sandwiched between the nip portions, and the thickness is said to be the same. In the case of paper thinner than the first interval, the first spring can press the first roller toward the second roller, and in the case of paper thicker than the first interval, the first roller. The spring and the second spring may be characterized in that the first roller can be pressed toward the second roller.

In the transport device of the present invention, the support unit has a housing and an arm rotatably provided on the housing to rotatably support the first roller, the first spring and the second spring. The spring may be characterized by pressing the arm.

In the transport device of the present invention, the first roller includes a plurality of individual rollers arranged at predetermined intervals in the width direction of the paper, and the arm rotatably supports the plurality of individual rollers. Including the individual arms, one of the first spring and the second spring presses a part of the plurality of individual arms, and the other of the first spring and the second spring is the plurality of individual arms. It may be characterized by pressing the rest of the.

In the transfer device of the present invention, the first spring and the second spring may be alternately arranged in the width direction with respect to the plurality of individual arms.

In the transport device of the present invention, the first roller includes a plurality of individual rollers arranged at predetermined intervals in the width direction of the paper, and the arm rotatably supports the plurality of individual rollers. An individual arm may be included, and both the first spring and the second spring may press each of the plurality of individual arms.

The transfer device of the present invention may be characterized in that the spring constant of the second spring is larger than the spring constant of the first spring.

The transport device of the present invention may be characterized in that a protrusion having a sharp tip is formed along the circumferential direction on the outer peripheral surface of the first roller.

The image forming apparatus of the present invention includes an image forming unit that forms an image on paper, and the conveying device that conveys a paper on which an image is formed by the image forming unit or a paper on which an image is formed by the image forming unit. It is characterized by having.

According to the present invention, when the paper thickness is thin, the pressing force due to the compression of the first spring is applied to the nip portion, and when the paper thickness is thick, the first spring and the second spring The pressing force due to the compression of is applied to the nip part. As described above, since the nip pressure can be lowered when the thin paper is conveyed and the nip pressure can be increased when the thick paper is conveyed, it is possible to prevent paper slippage and roller streaks.

It is a front view which shows typically the internal structure of the image forming apparatus which concerns on one Embodiment of this invention. It is a front view which shows typically the transport device which concerns on one Embodiment of this invention. It is a side view which shows typically the transport device which concerns on one Embodiment of this invention. It is a figure which shows typically the operation of the 1st spring and the 2nd spring in the state which the paper is not sandwiched in the nip part in the transport device which concerns on one Embodiment of this invention. It is a figure which shows typically the operation of the 1st spring and the 2nd spring in the state which the thin paper is sandwiched in the nip part in the transport device which concerns on one Embodiment of this invention. It is a figure which shows typically the operation of the 1st spring and the 2nd spring in the state which the plain paper is sandwiched in the nip part in the transport device which concerns on one Embodiment of this invention. It is a figure which shows typically the operation of the 1st spring and the 2nd spring in the state which the thick paper is sandwiched in the nip part in the transport device which concerns on one Embodiment of this invention. It is a figure which shows typically the operation of the 1st spring and 2nd spring in the state which the thick paper is obliquely conveyed in the transfer apparatus which concerns on one Embodiment of this invention. It is a front view which shows typically the modification of the transfer device which concerns on one Embodiment of this invention.

Hereinafter, an image forming apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.

The image forming apparatus 1 will be described with reference to FIG. FIG. 1 is a front view schematically showing an internal configuration of an image forming apparatus (at the time of image forming). The front side of the paper surface in FIG. 1 is the front side (front side) of the image forming apparatus. Fr, Rr, L, and R in each figure indicate the front side, the rear side, the left side, and the right side of the image forming apparatus 1, respectively.

The apparatus main body 3 of the image forming apparatus 1 is provided with a paper feeding unit 5, an inkjet type image forming unit 7, and a paper ejection tray 9.

The paper feed unit 5 is provided at the lower part of the device main body 3, and includes a plurality of paper feed cassettes 11 for accommodating paper, and a paper feed device 13 for feeding paper from each of the paper feed cassettes 11.

The image forming unit 7 is provided on the upper part of the apparatus main body 3, and includes a head unit 15 and a transport unit 17. The transport unit 17 is provided with four line heads 19. The four line heads 19 are arranged side by side and connected to an ink tank (not shown) containing the corresponding ink. The transport unit 17 includes a transport belt 21 that circulates. The transport belt 21 is arranged at a predetermined interval from the four line heads 19. The section between the four line heads 19 and the transport belt 21 is defined as the image forming path 23.

The output tray 9 is provided on the upper part of the right side surface of the apparatus main body 3. The apparatus main body 3 is formed with a paper transport path 25 from the paper feeding unit 5 to the paper ejection tray 9 through the image forming path 23 of the image forming unit 7. A plurality of transport devices 27 are provided along the transport path 25.

When an image forming job is input to the image forming apparatus 1, paper of a specified size is sent from the paper feed cassette 11 to the conveying path 25 by the feeding device 13, and is conveyed to the image forming path 23 of the image forming unit 7. To. In the image forming path 23, ink is ejected from the line head 19 according to the image forming job to form an image on the paper. The paper on which the image is formed is conveyed by the conveying device 27 along the conveying path 25, and is ejected to the paper ejection tray 9.

Next, the transport device 27 will be described with reference to FIGS. 2 and 3. FIG. 2 is a front view schematically showing a driven roller of a conveying device, and FIG. 3 is a side view schematically showing a driven roller of a conveying device.

In the transport device 27, a transport roller 35 having a drive roller 31 as a second roller and a driven roller 33 as a first roller forming a nip portion for holding the paper, and a driven roller 33 with respect to the drive roller 31. It is provided with a support unit 37 that supports the paper so as to be displaceable in the thickness direction of the paper, and a pressing member 39 that is provided on the support unit 37 and presses the driven roller 33 against the drive roller 31.

The drive roller 31 includes a rotating shaft 41 and a plurality of (for example, seven) rotating bodies 43 that rotate integrally with the rotating shaft 41. The rotating body 43 is a thin disk-shaped member. The drive rollers 31 are arranged along a width direction (front-back direction) orthogonal to the paper transport direction, and both ends of the rotation shaft 41 are rotatably supported by the apparatus main body 3. The rotating shaft 41 is connected to a motor (not shown). When the rotating shaft 41 is driven by the motor, the rotating body 43 rotates together with the rotating shaft 41 in the paper transport direction.

The driven roller 33 includes a plurality (7) individual rollers 45. Each individual roller 45 is a thin (for example, 2 mm thick) disc-shaped thin-walled roller. On the outer peripheral surface of each individual roller 45, a protrusion 47 having a sharp tip is formed along the circumferential direction.

The support unit 37 includes a housing 51 and an arm 53 that is swingably supported by the housing 51 and rotatably supports the driven roller 33.

The housing 51 is a member having a hollow portion capable of accommodating the arm 53 and having an open lower surface, and is a pair of side plates 51a facing each other at a predetermined interval in the width direction W (front-rear direction) of the paper. It has a top plate 51b provided between the side plates 51a. Both ends of the swing shaft 57 are supported between the upper portions of the pair of side plates 51a. The top plate 51b is provided with a plurality of (7) openings 59 and stoppers 61 corresponding to the respective openings 59 at predetermined intervals in the width direction. The stopper 61 is erected along the side surface of each opening 59 and is formed so as to bend at a right angle to the side of the opening 59.

The arm 53 includes an individual arm 65 that rotatably supports each of the plurality of individual rollers 45 of the driven roller 33. Each individual arm 65 has a shaft portion 67 that rotatably supports the driven roller 33, and a support portion 69 that is rotatably supported by the swing shaft 57. The support portion 69 supports the shaft portion 67 in parallel with the swing shaft 57 of the housing 51. When the individual arm 65 swings around the swing shaft 57, it is between the individual roller 45 and the rotating body 43 of the drive roller 31 (hereinafter, the rotating body 43 of the drive roller 31 is simply referred to as the drive roller 31). The interval of the nip portion N of the above varies. In other words, the individual rollers 45 can be displaced in the thickness direction of the paper. Specifically, when the individual arm 65 swings upward (clockwise in FIG. 3), the individual roller 45 separates from the drive roller 31 and the individual arm 65 moves downward (counterclockwise in FIG. 3). When swung to, the individual roller 45 approaches the drive roller 31.

The support portion 69 has a spring receiving plate 71 parallel to the axial direction of the shaft portion 67. Further, a protrusion 73 is formed on the upper surface of the support portion 69 so as to project in a direction orthogonal to the axial direction of the shaft portion 67. The protrusion 73 protrudes from the opening 59 of the top plate 51b of the housing 51. The protruding height of the protrusion 73 is regulated by the stopper 61. That is, the individual roller 45 regulates the swing of the individual arm 65 in the direction close to the drive roller 31 (counterclockwise direction in FIG. 3), and the paper is not sandwiched between the nip portion N (hereinafter, non-communication). The nip pressure in the paper state) is kept constant.

The pressing member 39 includes four first coil springs 75A as first springs and three second coil springs 75B as second springs. The spring constant of the second coil spring 75B is higher than the spring constant of the first coil spring 75A. As an example, the spring constant of the first coil spring 75A is 1 × 10 ^-4 (N / mm), and the spring constant of the second coil spring 75B is 1 × 10 ^-2 (N / mm).

One of the first coil spring 75A and the second coil spring 75B is arranged between the spring receiving plate 71 of the support portion 69 of the support portion 69 of some of the individual arms 65 and the top plate 51b of the housing 51 among the plurality of individual arms 65. The other of the first coil spring 75A and the second coil spring 75B is arranged between the spring receiving plate 71 of the support portion 69 of the remaining individual arm and the top plate 51b of the housing 51. In this example, the first coil spring 75A and the second coil spring 75B are alternately arranged in the width direction W. Specifically, the first coil spring 75A is arranged between the spring receiving plate 71 of the individual arms 65 and the top plate 51b of the housing 51 arranged every other arm 65, and the spring receiving plate 71 of the other individual arms 65 is arranged. A second coil spring 75B is arranged between the housing 51 and the top plate 51b of the housing 51. The first coil spring 75A and the second coil spring 75B urge each individual arm 65 downward with respect to the swing shaft 57, that is, the individual roller 45 in a direction close to the drive roller 31.

As shown in FIG. 2, in the non-paper-passing state, one end of the first coil spring 75A is fixed to the top plate 51b of the housing 51, and the other end abuts on the spring receiving plate 71 of the support portion 69, and the top plate It is compressed between 51b and the support portion 69. On the other hand, the second coil spring 75B has a free length, one end of which is fixed to the top plate 51b of the housing 51, but the other end does not contact the spring receiving plate 71 of the support portion 69, and the other end and the spring. A predetermined interval D (first interval) is provided between the receiving plate 71 and the receiving plate 71. Here, the predetermined interval D is, for example, wider than the standard paper thickness in the product specifications (for example, 0.091 mm) and narrower than the thickness of the thickest paper in the product specifications, for example, 0.5 mm. is there.

The transporting action of the transport device 27 having the above configuration will be described with reference to FIGS. 4A to 5B. 4A to 5B are schematically drawn to explain the operation of the first coil spring 75A and the second coil spring 75B, and the actual positional relationship between the first coil spring 75A and the second coil spring 75B and the spring receiving plate 71. Is different. In addition, the thickness of the paper is exaggerated. Here, the configuration in which the driven roller 33 is arranged on the upper side and the driving roller 31 is arranged on the lower side will be described.

As shown in FIG. 4A, in the non-passing state, the driven roller 33 (individual roller 45) comes into contact with the driving roller 31 and a nip portion N is formed between the two. An initial pressing force P0 due to compression of the first coil spring 75A is applied to the nip portion N. On the other hand, the second coil spring 75B has a free length, and a predetermined interval D (first interval) is provided between the other end and the spring receiving plate 71.

As shown in FIG. 4B, in a state where the plain paper S1 (thickness d1, for example, 0.091 mm) is sandwiched between the nip portions N, the driven roller 33 is lifted by the plain paper S1 and all the individual arms 65 Swings upward around the swing shaft 57. As a result, the first coil spring 75A is compressed by the thickness d1 of the plain paper S1 between the top plate 51b and the spring receiving plate 71, and a pressing force P1 corresponding to the compression length d1 is generated. That is, the pressing force of the first coil spring 75A fluctuates from the initial pressing force P0 to a pressing force P1 larger than the initial pressing force P0 due to the swing of the individual arm 65. On the other hand, the individual arm 65 corresponding to the second coil spring 75B also swings upward, but the second coil spring 75B remains free length. Therefore, in a state where the plain paper S1 is sandwiched between the nip portions N, a pressing force P1 (first pressing force) due to the swing of the individual roller 45 is applied to the nip portion N. The nip pressure of the nip portion N is set to be a pressing pressure suitable for the plain paper S1.

The plain paper S1 sandwiched between the rollers 31 and 33 by the nip portion N is conveyed by the rotation of the drive roller 31. At this time, since the tip of the protrusion 47 of the driven roller 33 comes into direct contact with the plain paper S1, the formed image is less likely to be disturbed.

As shown in FIG. 5A, a paper having a thickness d2 thicker than the thickness d1 of the plain paper S1 and having a predetermined interval D (0.5 mm) or less (hereinafter referred to as the plain paper S2) is a nip portion N. In the state of being sandwiched between the two, the driven roller 33 is lifted by the plain paper S2, and all the individual arms 65 swing upward about the swing shaft 57. As a result, the first coil spring 75A is further compressed by the thickness d2 (> d1) of the plain paper S2 between the top plate 51b and the spring receiving plate 71, and a pressing force P2 corresponding to the compression length d2 is generated. To do. That is, the pressing force of the first coil spring 75A fluctuates from the pressing force P1 when passing the plain paper S1 to the pressing force P2 larger than the pressing force P1 due to the swing of the individual arm 65. On the other hand, the individual arm 65 corresponding to the second coil spring 75B also swings upward, but the second coil spring 75B remains free length. Therefore, the pressing force P2 of the first coil spring 75A due to the swing of the individual arm 65 is applied to the nip portion N when the plain paper S2 is conveyed. That is, the thicker the paper, the higher the nip pressure.

As shown in FIG. 5B, when a paper having a thickness d3 of a predetermined interval D (0.5 mm) or more (hereinafter referred to as thick paper S3) is sandwiched between the nip portions N, the driven roller 33 is held by the thick paper S3. When lifted, all individual arms 65 swing upward around the swing shaft 57. As a result, the first coil spring 75A is further compressed by the thickness d3 (> d2) of the thick paper S3 between the top plate 51b and the spring receiving plate 71, and a pressing force P3 corresponding to the compression length is generated. That is, the pressing force of the first coil spring 75A fluctuates from the pressing force P2 when passing the plain paper S2 to the pressing force P3 larger than the pressing force P2 due to the swing of the individual arm 65. Further, the second coil spring 75B is also compressed by the interval d4 (= d3-D) between the top plate 51b and the spring receiving plate 71, which is obtained by subtracting the predetermined interval D (second interval) from the thickness d3 of the thick paper S3. Then, a pressing force P4 corresponding to the compression length is generated. Therefore, the pressing force P3 of the first coil spring 75A and the pressing force P4 (second pressing force) of the second coil spring 75B due to the swing of the individual arm 65 are applied to the nip portion N during the transportation of the thick paper S3. Since the second coil spring 75A has a higher spring constant than the first coil spring 75B, a higher pressing force can be applied.

As described above, in the image forming apparatus 1 of the present invention, the paper can be conveyed with an appropriate nip pressure according to the thickness of the paper. Specifically, when the paper is thin, the pressing force due to the compression of the first coil spring 75A is applied to the nip portion N, and when the paper is thick, the first coil spring 75A and the second coil spring 75B are applied. The pressing force due to the compression of is applied to the nip portion N. As described above, since the nip pressure can be lowered when the thin paper is conveyed and the nip pressure can be increased when the thick paper is conveyed, it is possible to prevent paper slippage and roller streaks.

Further, since the second coil spring 75B has a higher spring constant than the first coil spring 75A, a stronger nip pressure can be applied when the nip portions N are spaced apart. For example, as shown in FIG. 6, depending on the layout of the transport path 25, when the firm paper S4 is diagonally transported to the nip portion N, the driven roller 33 is moved from the drive roller 31 to a thickness equal to or larger than the thickness of the paper. Can be lifted. In such a case, the pressing force of the second coil spring 75B becomes higher, so that the paper can be conveyed with an appropriate nip pressure even in the case of oblique transfer. However, the spring constant of the second coil spring 75B may be the same as the spring constant of the first coil spring 75B. In this case as well, the nip pressure during cardboard transportation can be increased to some extent.

In the present embodiment, a plurality of individual rollers 45 are arranged at predetermined intervals along the width direction W, and the first coil spring 75A and the second coil spring 75B are alternately arranged along the width direction W. , A uniform pressing force can be applied to the nip portion N in the width direction W. By making the individual roller 5 a thin-walled roller, a plurality of individual rollers 45 can be arranged along the width direction W. The first coil spring 75A and the second coil spring 75B do not necessarily have to be arranged alternately. For example, two coil springs may be arranged alternately, or two first coil springs 75A may be arranged and one second coil spring 75B may be arranged in this order. In this way, by adjusting the nip pressures of the plurality of individual rollers 45 with each coil spring in consideration of the balance of the nip pressures in the width direction W, an appropriate nip pressure can be given as one driven roller 33.

Further, since the individual roller 45 is rotatably supported by the swingable individual arm 65 and the individual arm 65 is pressed by the first coil spring 75A or the second coil spring 75B, the individual roller 45 always follows the swing locus. Separated or close to the drive roller 31. Therefore, the individual roller 45 can be stably pressed against the drive roller 31.

The number of coil springs may be 3 or more. For example, when the third coil spring is provided, a wider interval than a predetermined interval D (second interval) is provided between the free end of the third coil spring and the spring receiving plate 71 in the non-paper-passing state. The spring constant of the third coil spring is preferably larger than the spring constant of the second coil spring. By providing such a third coil spring, a higher pressing force can be applied to the nip portion when the nip portion N opens more than the thickness of the paper as in the oblique transport shown in FIG.

Further, since the individual rollers 45 of the driven rollers 33 come into contact with the paper at the tips of the sharp protrusions 47, the image formed on the paper is less likely to be disturbed. However, the protrusion 47 is not always necessary. Further, a similar protrusion may be formed along the outer circumference of the rotating body 43 of the drive roller 31.

In the present embodiment, the transport device 27 in which the driven roller 33 is arranged on the upper side and the driving roller 31 is arranged on the lower side has been described, but the configuration in which the driven roller 33 is arranged on the lower side and the driving roller 31 is arranged on the upper side, or both rollers. It can also be applied to a transport device 27 having a configuration in which 31 and 33 are arranged side by side in the left-right direction. In these cases, since the weight of the support unit 37 including the driven roller 33 is not applied to the drive roller 31, the first coil spring 75A is compressed and the driven roller 33 is pressed against the drive roller 31 in the non-paper-passing state. Therefore, a predetermined initial pressing force P0 is generated in the nip portion N.

In the present embodiment, the number of the rotating body 43 of the driving roller 31 and the individual rollers 45 of the driven roller 33 is not limited to a plurality, and may be one. Alternatively, the shapes of the rotating body 43 of the driving roller 31 and the individual rollers 45 of the driven roller 33 may be cylindrical instead of disc-shaped.

A modified example of the transport device 27 will be described with reference to FIG. 7. FIG. 7 is a front view showing the transport device.

In this modification, both the first coil spring 75A and the second coil spring 75B are arranged between the individual arm 65 and the housing 51. Two spring receiving plates 71 are formed on the individual arm 65. The first coil spring 75A and the second coil spring 75B are arranged between the spring receiving plate 71 and the top plate 51b of the housing 51.

When the thickness of the paper sandwiched between the nip portions N is thinner than the predetermined interval D, the pressing force due to the compression of the first coil spring 75A is applied to the nip portion N, and the thickness of the paper is smaller than the predetermined interval D. If it is thick, a pressing force due to compression of the first coil spring 75A and the second coil spring 75B is applied to the nip portion N.

Also in this modified example, since the nip pressure can be set according to the thickness of the paper, it is possible to prevent the paper from slipping and the occurrence of roller streaks. Further, since one individual arm 65 corresponds to the first coil spring 75A and the second coil spring 75B, the number of individual rollers 45 can be reduced as compared with the configuration shown in FIG.

Although the present invention has been described for specific embodiments, the present invention is not limited to the above embodiments. Those skilled in the art can modify the above embodiment without departing from the scope and gist of the present invention.

1 Image forming device 27 Conveying device 31 Drive roller (second roller)
33 Driven roller (first roller)
35 Support unit 45 Individual roller 51 Housing 65 Individual arm 75A 1st coil spring (1st spring)
75B 2nd coil spring (2nd spring)

Claims (9)

A transport roller having a first roller and a second roller and forming a nip portion in which paper is sandwiched,
A support unit that supports the first roller so as to be displaceable with respect to the second roller in the thickness direction of the paper.
A pressing member provided on the support unit and pressing the first roller against the second roller is provided.
The pressing member is
A first spring that is compressed in a state where the first roller is in contact with the second roller to generate a pressing force,
A transport device including a second spring in which the first roller is compressed by being separated from the second roller by a distance of a first distance or more to generate a pressing force. The first roller is separated from the second roller against the pressing force of the pressing member according to the thickness of the paper sandwiched between the nip portions.
When the thickness of the paper is thinner than the first interval, the first spring can press the first roller toward the second roller.
1. The first spring and the second spring can press the first roller toward the second roller when the paper is thicker than the first interval. The transport device according to. The support unit
With the housing
It has an arm that is swingably provided in the housing and rotatably supports the first roller.
The transport device according to claim 1 or 2, wherein the first spring and the second spring press the arm. The first roller includes a plurality of individual rollers arranged at predetermined intervals in the width direction of the paper.
The arm includes a plurality of individual arms that rotatably support the plurality of individual rollers.
One of the first spring and the second spring presses a part of the plurality of individual arms, and the other of the first spring and the second spring presses the rest of the plurality of individual arms. The transport device according to claim 3, wherein the transport device is characterized by this. The transfer device according to claim 4, wherein the first spring and the second spring are alternately arranged in the width direction with respect to the plurality of individual arms. The first roller includes a plurality of individual rollers arranged at predetermined intervals in the width direction of the paper.
The arm includes a plurality of individual arms that rotatably support the plurality of individual rollers.
The transfer device according to claim 3, wherein both the first spring and the second spring press each of the plurality of individual arms. The transfer device according to any one of claims 1 to 6, wherein the spring constant of the second spring is larger than the spring constant of the first spring. The transport device according to any one of claims 1 to 7, wherein a protrusion having a sharp tip is formed on the outer peripheral surface of the first roller along the circumferential direction. An image forming part that forms an image on paper,
The transport device according to any one of claims 1 to 8, wherein the paper on which an image is formed by the image forming portion or the paper on which an image is formed by the image forming portion is conveyed. Image forming apparatus.

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