Sheet conveying device

Abstract

According to the invention, the sheet is not easy to contact with the turning part for turning the sheet. A sheet conveyance device (10) is provided with: a first conveyance unit (20) that conveys a belt-shaped sheet (1) having a first surface (1A) and a second surface (1B), which is a back surface of the first surface, such that the first surface faces downward; a turning section (30) provided downstream of the first conveying section and turning the sheet; and a second conveyance section (40) that is provided downstream of the turning section and conveys the sheet in such a manner that the second surface faces downward. The turning section is provided with a convex curved surface (31) having an axis extending in the width direction of the sheet, and the sheet is turned over along the convex curved surface such that the first surface faces inward. The convex curved surface includes: a small-diameter portion (32) in which an air nozzle (32a) for spraying air is formed; and a pair of large-diameter sections (33) which are disposed on both sides of the small-diameter section in the axial direction, protrude further outward in the radial direction than the small-diameter section, and support both ends (4A) of the sheet in the width direction.

Description

Technical Field

[0001] The present invention relates to a sheet material conveying device. Background Art

[0002] For example, Japanese Patent Application Publication No. 2023-003004 discloses a drying device that dries a coating material while conveying a strip of metal foil coated with a coating material. In the drying device described in Japanese Patent Application Publication No. 2023-003004, the conveying path is folded back twice in the vertical direction, and the conveying path is constructed into three layers. A semi-cylindrical air deflector is provided at the folded portion from the second layer to the third layer. The metal foil is conveyed along the semi-cylindrical outer circumference of the air deflector, with the coating material side facing inward. The air deflector is constructed such that the wall portion is made of a mesh and air is blown out from the wall portion. According to Japanese Patent Application Publication No. 2023-003004, the air blown from the air deflector can cause the metal foil to float from the air deflector, maintaining a predetermined gap with the air deflector while conveying it. The metal foil can be folded back at the air deflector without contact.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2023-003004. Summary of the Invention

[0004] In the sheet conveying device described in Japanese Patent Application Publication No. 2023-003004, if the metal foil comes into contact with the air deflector used to reverse the metal foil, the coating material applied to the metal foil may be damaged. Here, a sheet conveying device is proposed that makes it even more difficult for the sheet to come into contact with the turning portion of the reversed sheet.

[0005] The sheet conveying device proposed here comprises: a first conveying section for conveying a strip-shaped sheet having a first surface and a second surface serving as the back side of the first surface with the first surface facing downward; a turning section disposed downstream of the first conveying section for flipping the sheet; and a second conveying section disposed downstream of the turning section for conveying the sheet with the second surface facing downward. The turning section comprises a convex surface with an axis extending in the width direction of the sheet, for flipping the sheet along the convex surface with the first surface facing inward. The convex surface comprises: a small-diameter portion formed with an air nozzle for ejecting air; and a pair of large-diameter portions disposed on both sides of the small-diameter portion in the axial direction and protruding radially outward from the small-diameter portion, for supporting both end portions in the width direction of the sheet.

[0006] According to the sheet conveying device, air is ejected from the air nozzle of the small-diameter portion, and the pair of large-diameter portions disposed at both ends of the small-diameter portion support the widthwise ends of the sheet, thereby reliably lifting the portion of the sheet opposite the small-diameter portion from the small-diameter portion. This makes it more difficult for the sheet to come into contact with the turning portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic cross-sectional view of the sheet conveying device.

[0008] Figure 2 It is a perspective view of the steering part.

[0009] Figure 3 It is a top view of the steering part.

[0010] Figure 4 It is a side view of the steering part.

[0011] Description of Reference Numerals

[0012] 1…electrode sheet (sheet); 1A…coated surface (first surface); 1B…non-coated surface (second surface); 2…electrode foil; 3…coating material (slurry); 3A…coating portion; 4A…uncoated portion; 10…sheet conveying device; 20…first conveying portion; 21…upstream air nozzle; 22…upstream conveying roller; 30…turning portion; 31…convex surface; 32…small diameter portion; 32a…air nozzle; 32b…internal space; 32c…air inlet; 33…large diameter portion; 33a…rotating shaft; 33b…suction hole; 34…upstream auxiliary roller (auxiliary roller); 34a…rotating shaft; 35…downstream auxiliary roller (auxiliary roller); 35a…rotating shaft; 36…support component; 37…pressure reducing pipe; 40…second conveying portion; 41…downstream air nozzle; 42…downstream conveying roller. DETAILED DESCRIPTION

[0013] The following describes one embodiment of a sheet conveying device. The embodiment described herein is not intended to limit the present invention. Furthermore, the figures are schematic and do not necessarily accurately reflect actual implementations. Components and locations that perform the same function are denoted by the same reference numerals, and duplicate descriptions are omitted or simplified as appropriate.

[0014] [Structure of Sheet Conveying Device]

[0015] Figure 1This is a schematic cross-sectional view of a sheet conveyor 10. The sheet conveyor 10 is a device that conveys electrode sheets 1 of an electrical storage device. In this specification, the term "electrical storage device" refers to any device capable of extracting electrical energy. This term encompasses both primary and secondary batteries, including chemical batteries such as lithium-ion secondary batteries and nickel-metal hydride batteries, and physical batteries such as electric double-layer capacitors.

[0016] like Figure 1 As shown, the sheet conveying device 10 is configured to flip the electrode sheet 1 during conveyance. The electrode sheet 1 is a structure in which a coating material 3 (slurry) containing an electrode active material is coated on one surface of an electrode foil 2 and is formed into a strip shape. The electrode sheet 1 has: a coating surface 1A coated with the coating material 3, and a non-coating surface 1B which is the back of the coating surface 1A. The electrode sheet 1 has a pair of uncoated portions 4A (see FIG. 1 ) on which the coating material 3 is not coated at both ends in the width direction of the coating surface 1A. Figure 2 and Figure 3 , in addition, Figure 2 and Figure 3 In the figure, the coating surface 1A is the lower surface of the electrode sheet 1. Hereinafter, the area of ​​the coating surface 1A coated with the coating material 3 is also referred to as the coating portion 3A. Here, the illustrated portion of the sheet conveyor 10 is the portion that conveys the electrode sheet 1 in an undried coating material 3. However, the illustrated portion of the sheet conveyor 10 may also be the portion that conveys the electrode sheet 1 after the coating material 3 has been dried.

[0017] like Figure 1 As shown, the sheet conveying device 10 includes: a first conveying section 20 for conveying the electrode sheet 1; a turning section 30, which is arranged downstream of the first conveying section 20; and a second conveying section 40, which is arranged downstream of the turning section 30. Here, the first conveying section 20 and the second conveying section 40 are respectively arranged to be approximately horizontal. In the first conveying section 20, the electrode sheet 1 is conveyed with the coated surface 1A facing downward. In the turning section 30, the electrode sheet 1 is turned over with the coated surface 1A facing inward in such a manner that the non-coated surface 1B becomes downward. Here, turning over means rotating the electrode sheet 1 in such a manner that the upper surface and the lower surface are reversed. In the second conveying section 40, the electrode sheet 1 is conveyed with the non-coated surface 1B facing downward. The second conveying section 40 is arranged at a position lower than the first conveying section 20.

[0018] The first conveying section 20 is provided with an upstream air nozzle 21 for spraying air toward the coating surface 1A of the electrode sheet 1. The first conveying section 20 is configured to be able to float the electrode sheet 1 by the sprayed air. In this way, it is prevented that the undried (or dried) coating material 3 comes into contact with the sheet conveying device 10 and the coating material 3 is peeled off. The upstream air nozzle 21 is arranged at a position below the conveying path of the electrode sheet 1 in the first conveying section 20, and sprays air upward. An upstream conveying roller 22 is provided at a position above the conveying path of the electrode sheet 1 in the first conveying section 20. The upstream conveying roller 22 comes into contact with the non-coating surface 1B of the electrode sheet 1 and conveys the electrode sheet 1 downstream.

[0019] In this embodiment, the upstream air nozzle 21 is also a nozzle that sprays air for drying the coating material 3. In this embodiment, the electrode sheet 1 is dried while being conveyed by the sheet conveyor 10. However, the sheet conveyor 10 may also be a device that conveys the electrode sheet 1 with the coating material 3 in an undried state to a separately provided drying device.

[0020] The turning portion 30 includes a convex surface 31 along which the electrode sheet 1 follows when it is turned over. The turning portion 30 is configured to blow air from the convex surface 31 toward the radially outer side of the convex surface 31. This allows the coating portion 3A of the electrode sheet 1 to be transported while separated from the convex surface 31. By separating the coating portion 3A from the convex surface 31, damage to the coating portion 3A caused by contact with the turning portion 30 is prevented. The detailed structure of the turning portion 30 will be described later.

[0021] The second conveying section 40 includes a downstream air nozzle 41 that sprays air toward the coated surface 1A of the electrode sheet 1. The downstream air nozzle 41 is located above the conveying path of the electrode sheet 1 in the second conveying section 40 and sprays air downward. In the second conveying section 40, the electrode sheet 1 is conveyed with the coated surface 1A facing upward. A downstream conveying roller 42 is provided below the conveying path of the electrode sheet 1 in the second conveying section 40. The downstream conveying roller 42 contacts the non-coated surface 1B, which serves as the lower surface of the electrode sheet 1, and conveys the electrode sheet 1 downstream.

[0022] [Structure of the steering part]

[0023] Next, the structure of the steering portion 30 will be described. Figure 2 It is a perspective view of the steering portion 30 . Figure 3 It is a top view of the steering portion 30 . Figure 4 30 is a side view of the steering portion. Figures 2 to 4 As shown, the turning portion 30 includes a convex surface 31 whose axis extends along the width direction of the electrode sheet 1. The turning portion 30 turns the electrode sheet 1 along the convex surface 31 so that the coating surface 1A faces inward. Figures 2 to 4As shown, the convex surface 31 includes: a small diameter portion 32; a pair of large diameter portions 33, arranged on both sides of the axial direction of the small diameter portion 32 (the width direction of the electrode sheet 1); a pair of upstream auxiliary rollers 34, respectively abutting against the pair of large diameter portions 33; and a pair of downstream auxiliary rollers 35, respectively abutting against the pair of large diameter portions 33.

[0024] The small diameter portion 32 is formed into a semicircular shape with its axis extending along the width direction of the electrode sheet 1. Figure 1 As shown, the small diameter portion 32 is hollow. A plurality of air nozzles 32a for ejecting air are formed in the arc portion of the small diameter portion 32. Here, each air nozzle 32a is a substantially circular through-hole formed in a manner penetrating the arc portion of the small diameter portion 32, and is connected to the internal space 32b of the small diameter portion 32. The plurality of air nozzles 32a are evenly arranged in the entire arc portion of the small diameter portion 32. However, the shape and arrangement of the plurality of air nozzles 32a are not particularly limited. For example, a part or all of the plurality of air nozzles 32a may also be configured as a long hole that is longer in the width direction of the electrode sheet 1. The plurality of air nozzles 32a may also be configured, for example, so that the density on the upstream side in the conveying direction of the electrode sheet 1 is higher than that on the downstream side.

[0025] like Figure 1 As shown, the small-diameter portion 32 includes an air inlet 32c for introducing air into the internal space 32b. The air inlet 32c is connected to a blower fan (not shown). The air supplied from the air inlet 32c to the internal space 32b by the blower fan is ejected from the air nozzle 32a. Alternatively, the air may be supplied by, for example, an air compressor that generates compressed air, rather than by the blower fan.

[0026] like Figure 2 As shown, a pair of large diameter portions 33 are arranged on both sides of the axial direction of the small diameter portion 32, and protrude radially outward from the small diameter portion 32. The large diameter portions 33 are configured to be concentric with the small diameter portion 32. The radius of the large diameter portions 33 is greater than the radius of the small diameter portion 32. The difference between the radius of the large diameter portion 33 and the radius of the small diameter portion 32 is preferably not less than 1 mm and not more than 5 mm. The pair of large diameter portions 33 supports the two end portions in the width direction of the electrode sheet 1, and more specifically, supports the uncoated portions 4A provided at both ends of the coating surface 1A. The uncoated portions 4A at both ends of the electrode sheet 1 are in contact with the turning portion 30 (large diameter portion 33). The coating portion 3A of the electrode sheet 1 is not in contact with the small diameter portion 32, nor with the pair of large diameter portions 33.

[0027] The pair of large diameter portions 33 are configured to be rotatable around a rotation axis 33a extending in the axial direction (the width direction of the electrode sheet 1). The steering portion 30 includes a support member 36 that supports the pair of large diameter portions 33 so as to be rotatable. The outer portions of the large diameter portions 33 in the axial direction are supported by the support member 36 so as to be rotatable. In the present embodiment, the large diameter portions 33 are supported on one side by the support member 36. However, the large diameter portions 33 may also be supported by the small diameter portion 32 so as to be rotatable. In addition, here, the support member 36 also supports the small diameter portion 32 so as to be unable to rotate.

[0028] like Figure 2 As shown, a plurality of suction holes 33b for sucking air are formed in each of the large diameter portions 33. Each of the large diameter portions 33 is hollow and has an internal space (not shown). Here, each suction hole 33b is a substantially circular through-hole formed so as to penetrate the circumferential surface of the large diameter portion 33 and is connected to the internal space of the large diameter portion 33. The plurality of suction holes 33b are arranged throughout the entire circumference of the large diameter portion 33. However, the shape and arrangement of the suction holes 33b are not particularly limited.

[0029] The steering portion 30 includes a pair of pressure-reducing pipes 37 for sucking air from the internal spaces of the pair of large-diameter portions 33. The pressure-reducing pipes 37 are connected to the rotating shaft 33a of the large-diameter portion 33 and communicate with the internal space of the large-diameter portion 33. A fan (not shown) is connected to the other end of each pressure-reducing pipe 37. When the fan is driven, the internal space of the large-diameter portion 33 is depressurized, and external air is sucked in through a plurality of suction holes 33b formed on the circumferential surface of the large-diameter portion 33. As a result, the electrode sheet 1 (specifically, the uncoated portion 4A) supported by the large-diameter portion 33 is attracted to the large-diameter portion 33.

[0030] A pair of upstream auxiliary rollers 34 are configured to be rotatable around rotation axes 34a extending parallel to the rotation axes 33a of the pair of large diameter portions 33. The support member 36 supports the pair of upstream auxiliary rollers 34 so as to be rotatable. The pair of upstream auxiliary rollers 34 are in contact with the pair of large diameter portions 33, respectively. Therefore, if the pair of large diameter portions 33 rotate, the pair of upstream auxiliary rollers 34 rotate accordingly. Here, the pair of upstream auxiliary rollers 34 are arranged at a position upstream of the small diameter portion 32 in the conveying direction of the electrode sheet 1. The pair of upstream auxiliary rollers 34 are arranged at a position above the center axis of the small diameter portion 32 and the large diameter portion 33 (the rotation axis 33a of the large diameter portion 33). The pair of upstream auxiliary rollers 34 are in contact with the semicircular portion of the large diameter portion 33 on the opposite side to the semicircular portion supporting the electrode sheet 1 (the semicircular portion arranged in parallel with the small diameter portion 32). The pair of upstream auxiliary rollers 34 suppress the large diameter portion 33 from vibrating about the rotation axis 33a. The pair of upstream auxiliary rollers 34 receive the electrode sheet 1 and move it toward the side of the first conveying portion 20 ( Figure 1 The large diameter portion 33 is pressed on the right side of the body to suppress the rotational vibration of the large diameter portion 33.

[0031] The pair of downstream auxiliary rollers 35 are also configured to be rotatable around rotation axes 35a extending parallel to the rotation axes 33a of the pair of large diameter portions 33. The support member 36 supports the pair of downstream auxiliary rollers 35 so that they can rotate. The pair of downstream auxiliary rollers 35 are in contact with the pair of large diameter portions 33, and are driven to rotate when the pair of large diameter portions 33 rotate. The pair of downstream auxiliary rollers 35 are arranged at a position downstream of the small diameter portion 32 in the conveying direction of the electrode sheet 1. The pair of downstream auxiliary rollers 35 are arranged at a position below the central axis of the small diameter portion 32 and the large diameter portion 33 (the rotation axis 33a of the large diameter portion 33). The pair of downstream auxiliary rollers 35 are also in contact with the semicircular portion of the large diameter portion 33 on the side opposite to the semicircular portion supporting the electrode sheet 1. The pair of downstream auxiliary rollers 35, together with the upstream auxiliary roller 34, suppress the vibration of the rotation of the large diameter portion 33 around the rotation axis 33a. In addition, each of the upstream auxiliary roller 34 and the downstream auxiliary roller 35 may be divided into two so as to correspond to the pair of large-diameter portions 33 , or may be a single long roller.

[0032] [Effects of the embodiment]

[0033] Hereinafter, the effects that can be achieved by the sheet conveying device 10 according to this embodiment will be described.

[0034] The sheet conveying device 10 according to this embodiment includes: a first conveying section 20 for conveying a strip-shaped electrode sheet 1 having a coated surface 1A and an uncoated surface 1B, which is the back of the coated surface 1A, with the coated surface 1A facing downward; a turning section 30 having a convex curved surface 31 with its axis extending in the width direction of the electrode sheet 1 and disposed downstream of the first conveying section 20, for turning the electrode sheet 1 along the convex curved surface 31 with the coated surface 1A facing inward; and a second conveying section 40 disposed downstream of the turning section 30, for conveying the electrode sheet 1 with the uncoated surface 1B facing downward. The convex curved surface 31 includes a small-diameter portion 32 having an air nozzle 32a for ejecting air; and a pair of large-diameter portions 33 disposed on either side of the small-diameter portion 32 in the axial direction and projecting radially outward from the small-diameter portion 32 to support both widthwise ends of the electrode sheet 1.

[0035] According to this structure, air is ejected from the air nozzle 32a of the small diameter portion 32, and the two end portions of the electrode sheet 1 in the width direction are supported by a pair of large diameter portions 33 arranged at both ends of the small diameter portion 32, so that the portion of the electrode sheet 1 opposite to the small diameter portion 32 (here, the coating portion 3A) can be reliably floated from the small diameter portion 32. In detail, a gap is generated between the coating portion 3A and the small diameter portion 32 of the electrode sheet 1 by the support of the large diameter portion 33 that protrudes radially outward than the small diameter portion 32, so that the coating portion 3A is separated from the small diameter portion 32. In addition, the contact between the electrode sheet 1 and the large diameter portion 33 reduces the discharge of air from both sides in the width direction of the electrode sheet 1, so that the buoyancy of the air ejected from the small diameter portion 32 is increased. As a result, it is possible to make it difficult for the electrode sheet 1 to contact the turning portion 30. As a result, the concern that the coating portion 3A will be damaged due to contact with the turning portion 30 can be reduced.

[0036] In this embodiment, the electrode sheet 1 has a pair of uncoated portions 4A at both ends of the coating surface 1A in the width direction, where the coating material 3 is not applied. The uncoated portions 4A are supported by a pair of large-diameter portions 33. This structure prevents the coating material 3 from being damaged by contact with the large-diameter portions 33.

[0037] In this embodiment, the pair of large-diameter portions 33 are configured to rotate about a rotation axis 33a extending along the axial direction. With this configuration, the pair of large-diameter portions 33 rotate in a driven manner as the electrode sheet 1 is conveyed. This suppresses the stretching of the uncoated portion 4A caused by tension when wound around the large-diameter portions 33. Furthermore, the steering unit 30 may include a drive unit that rotates the pair of large-diameter portions 33 based on the conveying speed of the electrode sheet 1.

[0038] In this embodiment, suction holes 33b for sucking in air are formed in the pair of large-diameter portions 33. This structure allows the electrode sheet 1 to be attracted and adhered to the large-diameter portions 33. Therefore, the electrode sheet 1 is securely supported by the large-diameter portions 33. Furthermore, air leakage from both sides of the electrode sheet 1 in the width direction is reduced, and the buoyancy of the air ejected from the small-diameter portions 32 is further enhanced.

[0039] The sheet conveying device 10 according to this embodiment includes a pair of upstream auxiliary rollers 34. Each of the upstream auxiliary rollers 34 is configured to rotate about a rotation axis 34a extending parallel to the rotation axis 33a of the pair of large-diameter portions 33, and is in contact with the pair of large-diameter portions 33. This configuration suppresses jittering of the large-diameter portions 33 about the rotation axis 33a. Furthermore, by providing a pair of downstream auxiliary rollers 35, jittering of the rotation of the large-diameter portions 33 can be further effectively suppressed.

[0040] The sheet conveyed in this embodiment is an electrode sheet 1 having a coating material 3 (slurry) containing an electrode active material coated on its coating surface 1A. The sheet conveying device 10 according to this embodiment can be suitably used to convey such an electrode sheet 1.

[0041] The above describes one embodiment of the sheet conveying device proposed herein. However, the above embodiment is merely an example and can be implemented in other ways. Except where specifically mentioned, the above embodiment does not limit the present invention. In addition, the technology disclosed herein is capable of various modifications. As long as no particular problems arise, the various components and the various processes described herein can be appropriately omitted or appropriately combined.

[0042] For example, the sheet conveyor is not limited to conveying electrode sheets for storage devices, but can also convey other strip-shaped sheets. For example, the small-diameter portion can also be an arc shape that exceeds or is less than a semicircle. The first conveyor portion can be configured to convey the sheet with the coating portion facing downward, or it can convey the sheet in a direction other than the horizontal direction. The second conveyor portion can also be configured to convey the sheet with the coating portion facing upward, or it can convey the sheet in a direction other than the horizontal direction.

[0043] Furthermore, for example, the large diameter portion may be configured to be non-rotatable. Even if the large diameter portion does not rotate, the sheet conveying device can reduce the risk of the electrode sheet contacting the deflection portion and damaging the coating portion.

[0044] This specification includes the disclosure described in the following items.

[0045] Item 1:

[0046] A sheet conveying device, comprising: a first conveying part, which conveys a strip-shaped sheet having a first surface and a second surface serving as the back of the first surface with the first surface downward; a turning part, which has a convex surface with an axis extending in the width direction of the sheet and is arranged downstream of the first conveying part, so that the sheet is flipped along the convex surface with the first surface facing inward; and a second conveying part, which is arranged downstream of the turning part, so that the sheet is conveyed with the second surface downward, the convex surface including: a small diameter part, which is formed with an air nozzle for spraying air; and a pair of large diameter parts, which are arranged on both sides of the axial direction of the small diameter part and protrude radially outward than the small diameter part to support the two end portions in the width direction of the sheet.

[0047] Item 2:

[0048] The sheet conveying device according to Item 1, wherein the sheet has a pair of uncoated portions on both ends in the width direction of the first surface to which the coating material is not applied, and the pair of large-diameter portions supports the uncoated portions.

[0049] Item 3:

[0050] The sheet conveying device according to item 1 or 2, wherein the pair of large-diameter portions are configured to be rotatable around a rotation axis extending in the axial direction.

[0051] Item 4:

[0052] The sheet conveying device according to Item 3, wherein suction holes for sucking air are formed in the pair of large-diameter portions.

[0053] Item 5:

[0054] The sheet conveying device according to item 3 or 4 further comprises a pair of auxiliary rollers, wherein the pair of auxiliary rollers are configured to be rotatable around rotation axes extending parallel to the rotation axes of the pair of large diameter portions and to abut against the pair of large diameter portions respectively.

[0055] Item 6:

[0056] The sheet conveying device according to any one of items 1 to 5, wherein the sheet is an electrode sheet in which a slurry containing an electrode active material is applied on the first surface.

Claims

1. A sheet conveying device, characterized in that: have: a first conveying section for conveying a strip-shaped sheet having a first surface and a second surface that is a back surface of the first surface with the first surface facing downward; a turning portion having a convex surface with an axis extending in the width direction of the sheet, and disposed downstream of the first conveying portion, for turning the sheet along the convex surface with the first surface facing inward; as well as The second conveying portion is provided downstream of the turning portion and conveys the sheet with the second surface facing downward. The convex surface comprises: The small diameter portion is formed with an air nozzle for ejecting air; and The pair of large-diameter portions are arranged on both sides of the small-diameter portion in the axial direction and protrude radially outward from the small-diameter portion to support both ends of the sheet in the width direction.

2. The sheet material conveying device according to claim 1, wherein: The sheet has a pair of uncoated portions at both ends in the width direction of the first surface, where the coating material is not applied. The pair of large-diameter portions supports the uncoated portion.

3. The sheet material conveying device according to claim 1, wherein: The pair of large diameter portions are configured to be rotatable about a rotation axis extending in the axial direction.

4. The sheet material conveying device according to claim 3, wherein: Suction holes for sucking air are formed in the pair of large-diameter portions.

5. The sheet material conveying device according to claim 3, wherein: The invention further includes a pair of auxiliary rollers configured to be rotatable about rotation axes extending parallel to the rotation axes of the pair of large-diameter portions and to be in contact with the pair of large-diameter portions.

6. The sheet conveying device according to any one of claims 1 to 5, characterized in that: The sheet is an electrode sheet in which a slurry containing an electrode active material is coated on the first surface.

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