Conveying device

Abstract

To provide a conveying device that prevents collision noise and damage to a medium due to the collision of the medium with a pair of rollers.SOLUTION: A conveying device (e.g., inkjet printing device 1) includes a pair of rollers 31 that nip and convey a medium (e.g., paper P), a nip guide 70 that holds one roller (e.g., driven roller 31a) of the pair of rollers 31 and guides the medium toward the pair of rollers 31, and an energizing member (e.g., compression spring C) that energizes the nip guide 70 and the one roller so that the one roller is pressed against the other roller (e.g., drive roller 31b) of the pair of rollers 31. The nip guide 70 has a guide plate 71 that extends in a width direction W of the medium and in a conveying direction D of the medium and guides the medium toward the pair of rollers 31.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a transport device for transporting a medium. [Background technology]

[0002] Conventionally, there are known methods for guiding a sheet of paper toward a pair of rollers that nip and transport the sheet. For example, there is a known method for guiding the leading edge of the sheet toward the driven roller of the pair of rollers that has a smaller frictional force (see, for example, Patent Document 1). There is also known a method for guiding the sheet using a rib-shaped guide portion disposed on one side or the other side of the driven roller in the axial direction (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 05-032350 [Patent Document 2] Japanese Patent Application Publication No. 2020-040819 Summary of the Invention [Problem to be solved by the invention]

[0004] When a medium such as paper is transported after image formation, a common approach to preventing retransfer by rollers is to use a coated roller coated with fine particles such as ceramic or a mesh roller covered with knitted fabric to achieve point contact between the roller and the medium. Furthermore, to prevent paper dust and other particles from accumulating on the roller, it is important that the roller has large unevenness, and mesh rollers are particularly effective. However, when the roller has large unevenness, the leading edge of the medium tends to come into contact with the underside of the roller rather than the nip point of the roller pair due to the curvature of the transport path and the amount of roller protrusion, which can easily damage the leading edge of the medium.

[0005] In the method described above, where the leading edge of the paper is guided to the driven roller of the pair of rollers with the smaller friction, taking into account variations in parts, it is necessary to guide the leading edge of the paper significantly toward the driven roller, which raises the concern that the leading edge of the paper may strike the roller's belly, generating a collision noise. This collision noise is particularly noticeable with mesh rollers and curved transport paths, but can also occur with rollers without uneven surfaces and straight transport paths.

[0006] Furthermore, when the medium is guided by a ribbed guide, the contact surface between the medium and the guide is small, making the guide more susceptible to wear and reducing durability and strength. Furthermore, if the thickness of the ribbed guide in the thickness direction of the medium is increased to improve durability and strength, and the guide is positioned in the same axial position as the roller pair, the medium cannot be guided near the nip area where the roller pair nips the medium. Therefore, as described above, the medium hits the roller, and it is not possible to prevent collision noise or damage to the medium.

[0007] An object of the present invention is to provide a transport device that can prevent collision noise and damage to the medium caused by the medium colliding with a pair of rollers. [Means for solving the problem]

[0008] In one embodiment, the conveying device includes a pair of rollers that nip and convey the medium, a nip guide that holds one of the rollers and guides the medium toward the pair of rollers, and a biasing member that biases the nip guide and the one roller so that the one roller is pressed against the other roller of the pair of rollers, and the nip guide has a guide plate that extends in the width direction of the medium and the conveying direction of the medium and guides the medium toward the pair of rollers. [Effects of the Invention]

[0009] According to this aspect, it is possible to prevent collision noise and damage to the medium caused by the medium colliding with the roller pair. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a front view showing the internal structure of an inkjet printing apparatus according to an embodiment; [Figure 2] FIG. 2 is a block diagram showing a control configuration of the inkjet printing apparatus according to the embodiment. [Figure 3] FIG. 2 is a cross-sectional view showing a curved transport path in one embodiment. [Figure 4] FIG. 2 is a perspective view showing a nip guide and a driven roller according to the embodiment. [Figure 5] FIG. 2 is a perspective view showing a driven roller according to an embodiment. [Figure 6] FIG. 2 is a perspective view illustrating a nip guide according to an embodiment. [Figure 7] FIG. 7 is an enlarged view of part VII in FIG. [Figure 8] FIG. 2 is a perspective view showing a nip guide and a driven roller with a bearing according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] A transport device according to an embodiment of the present invention will be described below with reference to the drawings, taking an inkjet printing device as an example of the transport device.

[0012] 1 and 2 are a front view showing the internal structure of the inkjet printing apparatus 1 and a block diagram showing the control configuration.

[0013] Note that the up-down, front-back, and left-right directions shown in Figure 1 and Figures 3 to 8 described below are examples for the convenience of explanation, and for example, the up-down direction is the vertical direction, and the front-back and left-right directions are the horizontal directions.

[0014] 1, the inkjet printing apparatus 1 includes a device housing 2, an external paper feed unit 10, an internal paper feed unit 20, an inkjet head 40, a print transport unit 50, and a paper discharge unit 60. Also, as shown in FIG. 2, the inkjet printing apparatus 1 further includes a control unit 81, a memory unit 82, an interface unit 83, and a transport drive unit 84.

[0015] In FIG. 1, the transport path of paper P from the external paper feed unit 10 or the internal paper feed unit 20 to the paper discharge unit 60 is indicated by a solid line, and the switchback path 34 for double-sided printing is indicated by a dashed line. Note that paper P in this embodiment is an example of a medium, and this medium may be a sheet-like object made of a material other than paper, or an object with a folded portion such as an envelope. Therefore, in this specification, paper feed is an example of supply, and paper discharge is an example of ejection. Therefore, paper feed can be substituted for supply, paper discharge for ejection, and paper for medium.

[0016] Furthermore, in this embodiment, the inkjet printing device 1 will be described as an example of a conveying device, but the conveying device may be any device that conveys paper P (medium). Therefore, the conveying device according to this embodiment may be a processing device that includes a processing unit that performs processing other than image formation, such as inspection, on paper P, or a conveying device that does not include such a processing unit.

[0017] The external paper feed unit 10 has a paper feed tray 11, paper feed rollers 12, and a separation plate 13. The external paper feed unit 10 is an example of a supply unit, and is arranged, for example, so as to be exposed to the outside of the device housing 2, and feeds paper sheets P into the device housing 2. Paper sheets P before image formation are stacked in the paper feed tray 11. For example, two paper feed rollers 12 are arranged side by side in the transport direction D of the paper sheets P, and feed and transport the uppermost paper sheet P among the multiple sheets of paper sheets P stacked in the paper feed tray 11. The separation plate 13 sandwiches the paper sheets P between itself and the paper feed rollers 12, and separates them one by one.

[0018] The internal paper feed unit 20 has a first paper feed unit 21, a second paper feed unit 22, and a third paper feed unit 23. The first paper feed unit 21, the second paper feed unit 22, and the third paper feed unit 23 are arranged in this order from top to bottom inside the device housing 2. The first paper feed unit 21, the second paper feed unit 22, and the third paper feed unit 23 each have a paper feed tray 21a, 22a, 23a on which paper sheets P before image formation are stacked, and paper feed rollers 21b, 22b, 23b that pick up and transport the uppermost paper sheet P among the multiple sheets of paper sheets P stacked in the paper feed tray 21a, 22a, 23a.

[0019] The inkjet printing apparatus 1 further includes a plurality of roller pairs 31, a path switching unit 32, a switchback roller pair 33, a switchback path 34, and conveying paths 35 and 36 shown in FIG.

[0020] The roller pair 31 conveys the paper sheet P while nipping it along a conveyance path of the paper sheet P inside the device housing 2, for example.

[0021] The path switching unit 32 switches the transport path of the paper P on which an image has been formed by the inkjet head 40 between a path toward the paper discharge unit 60 and a switchback path 34. The path switching unit 32 is, for example, a flipper. The switchback roller pair 33 reverses the paper P by transporting it in a switchback manner on the switchback path 34. The switchback path 34 is used to circulate the paper P and re-feed it to the inkjet head 40 for double-sided printing.

[0022] The inkjet head 40 is, for example, a line-type inkjet head having one or more head modules each having a plurality of nozzles for ejecting ink, and ejects ink onto the paper P transported by the roller pair 31 and a print transport unit 50 (described later). In this way, the inkjet head 40 forms an image on the paper P. The inkjet head 40 is an example of an image forming unit. The method of image formation is not limited to inkjet printing.

[0023] The print transport unit 50 is disposed opposite the inkjet head 40 and transports the paper P. The print transport unit 50 has a plurality of pulleys 51, a belt 52 stretched across the pulleys 51, and a suction fan 53 that sucks air through a plurality of holes in the belt 52 to adsorb the paper P to the belt 52. The print transport unit 50 may have a transport member other than the belt 52, such as a roller, or may not adsorb the paper P. The print transport unit 50 functions as an example of a transport unit that transports the paper P together with the roller pair 31 and the like. This transport unit may have a transport member such as a roller or a belt.

[0024] The paper discharge unit 60 has a paper discharge tray 61 and paper discharge rollers 62. The paper discharge unit 60 is an example of a discharge unit, and is arranged, for example, so as to be exposed to the outside of the device housing 2, and discharges paper P to the outside of the device housing 2. Paper P after image formation is stacked on the paper discharge tray 61. The paper discharge rollers 62 are arranged, for example, in a pair above and below, and transport paper P toward the paper discharge tray 61.

[0025] The inkjet printing apparatus 1 further includes a nip guide 70 shown in Figures 3, 4, 6, and 7. The nip guide 70 is made of, for example, a plastic material, and has a guide plate 71, a pair of support portions 72 and 73, a base portion 74, and a plurality of reinforcing ribs 75, as shown in Figure 6.

[0026] Nip guide 70 holds driven roller 31a of roller pair 31. Driven roller 31a held by nip guide 70 is provided on a conveying path (see FIG. 3) that curves upward and is used to convey paper P on which an image has been formed by inkjet head 40. By holding driven roller 31a with nip guide 70, the relative position between nip guide 70 and driven roller 31a (such as the amount of protrusion of driven roller 31a from guide plate 71) can be kept constant. Roller pair 31 may include, for example, a coated roller coated with fine particles such as ceramic, or a mesh roller covered with knitted fabric.

[0027] 3 is disposed near the gap between conveying paths 35 and 36, each of which is formed by a pair of curved plate-like members. Roller pair 31 has driven roller 31a and drive roller 31b. Note that nip guide 70 and roller pair 31 having driven roller 31a held by nip guide 70 are disposed two by two, side by side in width direction W of paper P, but the number of sets of nip guide 70 and roller pair 31 may be any number greater than or equal to one. Furthermore, sets of nip guide 70 and roller pair 31 may be disposed at multiple positions different in conveying direction D.

[0028] 4, the guide plate 71 extends in the width direction W of the paper P and in the transport direction D of the paper P, and guides the paper P toward the roller pair 31. The guide plate 71 preferably has a thin, flat plate shape. In addition, the guide plate 71 preferably extends over a length in the width direction W of the paper P that is at least half the length of the driven roller 31a, and desirably extends over the entire area of ​​the driven roller 31a.

[0029] As shown in FIG. 7, the guide plate 71 enters the space S between the roller pair 31 (the space S sandwiched between the driven roller 31a and the drive roller 31b as shown by the two-dot chain line). Preferably, the guide plate 71 extends in the conveying direction D in the space S by a length L2 that is at least half of the length L1 along the conveying direction D in the space S up to the nip region N (the region where the roller pair 31 nip the paper P). The guide plate 71 is also preferably positioned so that the nip region N is located on an extension of the contact surface with the paper P in the conveying direction D. The guide plate 71 can guide the paper P while contacting it by extending so as to intersect with the conveying path of the paper P continuing from the conveying path 35. Note that the nip region N is not a linear region extending only in the width direction W of the paper P, but is an area that extends in both the width direction W and the conveying direction D, due to the elasticity of the roller pair 31. Furthermore, it is desirable that the upper end of the guide plate 71 (the downstream end in the conveying direction D) and the upper ends of a plurality of reinforcing ribs 75, which will be described later, have a tapered shape that conforms to the outer circumferential surface of the driven roller 31a.

[0030] As shown in Fig. 4, the pair of support parts 72, 73 support both ends in the width direction W of the roller shaft A (see Fig. 5) that supports the driven roller 31a. The pair of support parts 72, 73 bend so as to move away from each other in the width direction W of the paper P when the roller shaft A (driven roller 31a) is inserted, and preferably support the roller shaft A with a snap fit.

[0031] As shown in FIG. 6, the pair of support portions 72, 73 are provided with shaft accommodating recesses 72a, 73a that accommodate the ends of roller shaft A, and bearing accommodating recesses 72b, 73b that accommodate part of bearing B attached to roller shaft A, as shown in FIG. 8. The roller shaft A is inserted into the shaft accommodating recesses 72a, 73a in the direction opposite (downward from) the conveying direction D. Similarly, the bearing B is inserted into the bearing accommodating recesses 72b, 73b in the direction opposite (downward from) the conveying direction D. For this reason, grooves 73a-1, 73b-1 (only the support portion 73 side is shown) extending from the shaft accommodating recesses 72a, 73a and the bearing accommodating recesses 72b, 73b in the conveying direction D are preferably provided. In other words, when secured by the snap fit described above, the roller shaft A and the bearing B are guided into the shaft accommodating recesses 72a, 73a and the bearing accommodating recesses 72b, 73b along the grooves 73a-1, 73b-1 in the direction opposite (downward from) the conveying direction D.

[0032] Here, the pair of support portions 72, 73 have shaft accommodating recesses 72a, 73a and bearing accommodating recesses 72b, 73b, and are therefore capable of holding either a roller shaft A without a bearing B (see FIG. 4) or a roller shaft A with a bearing B that can withstand high loads and high rotations (see FIG. 8). Note that if the roller shaft A is not provided with a bearing B as shown in FIG. 4, it will not rotate integrally with the driven roller 32a, but if the roller shaft A is provided with a bearing B as shown in FIG. 8, it will rotate integrally with the driven roller 32a.

[0033] As shown in Fig. 4, nip guide 70 is biased leftward by a pair of compression springs C (shown by two-dot chain lines) disposed between a pair of support portions 72, 73 and the aforementioned conveying path 36 shown in Fig. 3, so that driven roller 31a is pressed against drive roller 31b. Because nip guide 70 holds driven roller 31a via roller shaft A at the pair of support portions 72, 73 as described above, it can be said that nip guide 70 is biased together with driven roller 31a by the pair of compression springs C. Note that compression springs C are an example of a biasing member.

[0034] 6, the base portion 74 has a flat plate shape that extends perpendicular to the conveying direction D (guide plate 71). The base portion 74 is provided integrally with the guide plate 71 and the pair of support portions 72, 73.

[0035] The multiple reinforcing ribs 75 are integrally provided on the base portion 74 so as to rise from the base portion 74 in the conveying direction D. As described above, the upper ends of the reinforcing ribs 75 preferably have a shape that follows the outer peripheral surface of the driven roller 31a.

[0036] 2 has a processor (e.g., CPU: Central Processing Unit) that functions as an arithmetic processing device that controls the overall operation of the inkjet printing apparatus 1. This processor controls each part of the inkjet printing apparatus 1 by reading and executing a predetermined program, for example, from the storage unit 82 or from a storage medium (non-transitory computer-readable recording medium) that is detachable from the inkjet printing apparatus 1. In this way, the control unit 81 or the inkjet printing apparatus 1 (the control unit 81 and the storage unit 82) functions as a computer that executes a program.

[0037] The storage unit 82 has, for example, memory such as a ROM (Read Only Memory), which is a read-only semiconductor memory in which a predetermined control program is pre-recorded, and a RAM (Random Access Memory), which is a semiconductor memory that can be written to and read at any time and is used as a working memory area as needed when the processor executes various control programs.

[0038] The interface unit 83 exchanges various types of information with external devices. For example, the interface unit 83 receives a print job including print data from a print control device or a user terminal.

[0039] The transport drive unit 84 is a plurality of actuators such as a plurality of motors that drive the roller pairs 31 (drive roller 31b), path switching unit 32, switchback roller pair 33, switchback path 34, etc. shown in FIG.

[0040] Here, an overview of the operation of the inkjet printing apparatus 1 will be described.

[0041] First, the external paper feed unit 10 or the internal paper feed unit 20 feeds paper P toward the inkjet head 40. The paper P on which an image has been formed by the inkjet head 40 is transported along a transport path formed by the transport paths 35, 36, etc., by a plurality of roller pairs 31, such as the roller pair 31 shown in FIG.

[0042] 7, the guide plate 71 guides the paper P along the conveying direction D to the vicinity of the nip region N. Therefore, the paper P is conveyed toward the nip region N, and is less likely to be conveyed biasedly toward one of the driven roller 31a and the drive roller 31b.

[0043] Then, the path switching unit 32 switches the transport path of the paper P on which an image has been formed on one side in single-sided printing and the paper P on which images have been formed on both sides to a path leading to the paper discharge unit 60, and switches the transport path of the paper P on which an image has been formed on only one side in double-sided printing to the switchback path 34. The switchback roller pair 33 reverses the paper P by switchback transporting the paper P on the switchback path 34. The paper P whose front and back have been reversed on the switchback path 34 is transported again to the inkjet head 40.

[0044] In the above description, the nip guide 70 holds the driven roller 31a of the roller pair 31 that transports the paper P after an image has been formed on it, but it may also hold the driven roller 31a of the roller pair 31 that transports the paper P before an image has been formed on it. The roller pair 31 may also be made up of two driven rollers 31a. It is preferable that the nip guide 70 hold the driven roller 31a provided on a curved transport path, but it may also hold the driven roller 31a provided on a straight transport path.

[0045] In the above description, a pair of compression springs C are used as the biasing members that bias the nip guide 70 and the driven roller 31a at the pair of support portions 72, 73 of the nip guide 70. However, the biasing members may be other springs, such as tension springs, or elastic bodies other than springs, such as rubber. The number of compression springs C (biasing members) is not limited to two, and may be one or more. The compression springs C (biasing members) may press the roller shaft A of the driven roller 31a instead of the nip guide 70.

[0046] In the present embodiment described above, the inkjet printing device 1, which is an example of a conveying device, includes a pair of rollers 31, a nip guide 70, and a compression spring C, which is an example of a biasing member. The pair of rollers 31 nip and convey paper P, which is an example of a medium. The nip guide 70 holds a driven roller 31a, which is an example of one of the rollers in the pair of rollers 31, and guides the paper P toward the pair of rollers 31. The compression spring C biases the nip guide 70 and the driven roller 31a so that the driven roller 31a is pressed against the drive roller 31b. The nip guide 70 has a guide plate 71 that extends in the width direction W of the paper P and in the conveyance direction D of the paper P and guides the paper P toward the pair of rollers 31.

[0047] In this way, the guide plate 71 expands in the width direction W and the conveying direction D of the paper P, thereby increasing the contact surface area with the paper P compared to an embodiment in which the paper P is guided by a ribbed guide portion. Therefore, the guide plate 71 is less susceptible to wear, and its durability and strength are increased, allowing the thickness of the guide plate 71 to be reduced. Furthermore, by holding the driven roller 31a with the nip guide 70, fluctuations in the relative position between the nip guide 70 and the driven roller 31a due to component variations and other factors can be suppressed. Therefore, by guiding the paper P to the vicinity of the nip region N of the roller pair 31, it is possible to suppress the paper P from being conveyed biased toward one of the driven roller 31a and the drive roller 31b rather than the nip region N and coming into contact with the driven roller 31a or the drive roller 31b. Therefore, this embodiment can prevent collision noise and damage to the paper P due to the paper P colliding with the roller pair 31. Regarding the collision noise, it was confirmed that the noise level of the inkjet printing device 1 was reduced by 0.4 dB compared to an embodiment in which the nip guide 70 was replaced with a guide that did not hold the driven roller 31a and did not enter the space S between the roller pair 31.

[0048] Incidentally, the roller pair 31 used to transport the paper P, particularly after image formation, is a mesh roller or other roller with irregularities. In this case, when the paper P comes into contact with the antinode of the roller pair 31, the collision noise becomes loud and the paper P is likely to be damaged. Furthermore, when the roller pair 31 transports the paper P along a curved transport path, the paper P is likely to come into contact with the antinode of the roller pair 31. However, by using the nip guide 70 of this embodiment, even if the roller pair 31 is a mesh roller or the roller pair 31 is provided along a curved transport path, the nip guide 70 can guide the paper P to the vicinity of the nip region N, thereby effectively preventing the collision noise from becoming loud and the paper P from being damaged.

[0049] In this embodiment, the guide plate 71 enters the space S between the roller pair 31.

[0050] Therefore, the paper P can be guided to the vicinity of the nip area N, and the occurrence of collision noise and damage to the paper P can be effectively prevented.

[0051] In addition, in this embodiment, the guide plate 71 extends in the conveying direction D in the space S by a length L2 that is more than half the length L1 along the conveying direction D in the space S up to the nip area N where the roller pair 31 nips the paper P.

[0052] This allows the paper P to be guided closer to the nip area N, and the occurrence of collision noise and damage to the paper P can be further prevented.

[0053] In this embodiment, the guide plate 71 extends across the entire area of ​​the driven roller 31a in the width direction W of the paper P.

[0054] This increases the contact surface with the paper P, making the nip guide 70 less susceptible to wear and increasing its durability and strength. This makes it possible to further reduce the thickness of the guide plate 71 and guide the paper P closer to the nip area N. This further reduces collision noise and damage to the paper P.

[0055] In addition, in this embodiment, the inkjet printing device 1 further includes a roller shaft A that supports the driven roller 31a, and the nip guide 70 has a pair of support portions 72, 73 that are inserted in the opposite direction to the conveying direction D at both ends in the width direction W of the roller shaft A and support both ends of the roller shaft A.

[0056] When the roller shaft A (driven roller 31a) is inserted into a pair of support portions 72, 73 in the opposite direction to the conveying direction D in this manner, the roller shaft A and driven roller 31a are less likely to interfere with the pair of support portions 72, 73, etc., compared to when the roller shaft A (driven roller 31a) is inserted into a pair of support portions 72, 73 in another direction, and the guide plate 71 can be positioned closer to the nip area N.

[0057] The present invention is not limited to the above-described embodiments, and can be embodied by modifying the components without departing from the spirit of the invention in the implementation stage. Furthermore, various inventions can be formed by appropriately combining the multiple components disclosed in the above-described embodiments. For example, all the components shown in the embodiments may be appropriately combined. Naturally, various modifications and applications are possible without departing from the spirit of the invention. Below, some of the inventions described in the specification of this application are additionally noted.

[0058] [Appendix 1] a pair of rollers that nip and transport the medium; a nip guide that holds one of the rollers of the roller pair and guides the medium toward the roller pair; a biasing member that biases the nip guide and the one roller so that the one roller is pressed against the other roller of the roller pair, The nip guide has a guide plate that extends in the width direction of the medium and in the transport direction of the medium and guides the medium toward the pair of rollers. A conveying device characterized by:

[0059] [Appendix 2] The guide plate enters the space between the pair of rollers. 2. The conveying device according to claim 1.

[0060] [Appendix 3] The guide plate extends in the space in the transport direction by a length equal to or greater than half of the length along the transport direction in the space up to a nip region where the pair of rollers nip the medium. 3. The conveying device according to claim 2.

[0061] [Appendix 4] The guide plate extends across the entire area of ​​the one roller in the width direction. 4. The conveying device according to any one of claims 1 to 3.

[0062] [Appendix 5] the one roller is a driven roller, the conveying device further includes a roller shaft supporting the driven roller; The nip guide has a pair of support portions that are inserted in a direction opposite to the conveying direction and support both ends of the roller shaft in the width direction. 5. A conveying device according to any one of claims 1 to 4. [Explanation of symbols]

[0063] 1. Inkjet printing device 2. Device housing 10 External paper feed section 20 Internal paper feed section 31 Laura Vs. 31a driven roller 31b Drive roller 32 Route switching unit 33 Switchback Roller Pair 34 Switchback Route 35,36 Transport path 40 Inkjet head 50 Printing transport section 60 Paper output section 70 Nip guide 71 Guide plate 72,73 Support part 72a, 73a Shaft receiving recess 73a-1 Groove 72b, 73b Bearing accommodating recess 73b-1 Groove 74 Base part 75 Reinforcing rib A Roller shaft B bearing C Compression spring D Conveying direction N nip area P Paper S space W width direction

Claims

1. a pair of rollers that nip and transport the medium; a nip guide that holds one of the rollers of the roller pair and guides the medium toward the roller pair; a biasing member that biases the nip guide and the one roller so that the one roller is pressed against the other roller of the roller pair, The nip guide has a guide plate that extends in the width direction of the medium and in the transport direction of the medium and guides the medium toward the pair of rollers. A conveying device characterized by:

2. The guide plate enters the space between the pair of rollers.

2. The conveying device according to claim 1.

3. The guide plate extends in the space in the transport direction by a length equal to or greater than half of the length along the transport direction in the space up to a nip region where the pair of rollers nip the medium.

3. The conveying device according to claim 2.

4. The guide plate extends across the entire area of ​​the one roller in the width direction.

2. The conveying device according to claim 1.

5. the one roller is a driven roller, the conveying device further includes a roller shaft supporting the driven roller; The nip guide has a pair of support portions that are inserted in a direction opposite to the conveying direction and support both ends of the roller shaft in the width direction.

2. The conveying device according to claim 1.

Images