Sheet conveying device

Abstract

To ensure that there is enough force to float a sheet in the turn section where the sheet is flipped over.SOLUTION: A sheet transport device 10 has: a first transport section 20 in which a strip-shaped sheet 1 having a first side 1A and a second side 1B is transported with the first side 1A down; and a turn section 30 provided downstream of the first transport section 20 that turns the sheet 1 with the first side 1A facing inward so that the second side 1B is down. The turn section 30 has a convex curved surface 31 along which the sheet 1 is turned over. The convex curved surface 31 has a first air jet portion 32 provided in an upstream end region 31U that injects air toward the first side 1A of the sheet 1 and a second air jet portion 33 provided in a downstream region 31D from the upstream end region 31U that injects air toward the first side 1A of the sheet 1. The first air jetting section 32 injects air to generate a buoyancy force greater than that of the second air jetting section 33.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sheet transport device. [Background technology]

[0002] For example, Patent Document 1 discloses a web conveying device that conveys a web on which a coating film has been formed by a coating device and passes it through a drying device. In the conveying device described in Patent Document 1, the web conveyance path is set so that the web runs upward, then turns around two turn rolls, and runs downward. The turn rolls are provided with a number of openings for blowing air to lift the web. Patent Document 1 discloses that by injecting air through the openings in the turn rolls, the web lifts from the turn rolls, allowing the web to be supported in a floating state and transported. This prevents damage to the wet coated surface of the web.

[0003] Furthermore, for example, Patent Document 2 discloses an electrode manufacturing apparatus having multiple electrode transport sections along which strip-shaped electrode foils having coating layers formed thereon are transported. The multiple electrode transport sections are aligned vertically and each extends substantially horizontally. A pair of upper and lower folding rollers is provided between the multiple electrode transport sections. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-149963 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-182621 Summary of the Invention [Problem to be solved by the invention]

[0005] The sheet conveying device described in Patent Document 2 conveys a sheet in a substantially horizontal direction, and then turns the sheet over by vertically wrapping the sheet around a turn section provided with a turn-back roller. For example, in such a sheet conveying device, if sufficient buoyancy force is not obtained to lift the sheet at the entrance of the turn section, the sheet may come into contact with the turn section. This paper proposes a sheet conveying device that prevents the sheet from coming into contact with the turn section that turns the sheet over. [Means for solving the problem]

[0006] The sheet conveying device proposed here includes a first conveying unit, a turning unit, and a second conveying unit. In the first conveying unit, a band-shaped sheet having a first side and a second side opposite to the first side is conveyed with the first side facing down. The turning unit is provided downstream of the first conveying unit and turns the sheet over with the first side facing inward so that the second side faces down. The second conveying unit is provided downstream of the turning unit and conveys the sheet with the second side facing down. The first conveying unit includes an air nozzle that sprays air toward the first side of the sheet and is configured to be able to lift the sheet with the sprayed air. The turning unit includes a convex curved surface along which the sheet is turned over. The convex curved surface includes a first air ejection unit that is provided in an upstream end region and sprays air toward the first side of the sheet, and a second air ejection unit that is provided in a region downstream of the upstream end region and sprays air toward the first side of the sheet. The first air injection unit injects air so as to generate a greater buoyancy force than the second air injection unit.

[0007] According to the above-described sheet conveying device, the buoyancy of the air ejected from the first air ejection unit provided in the upstream end region of the convex curved surface is greater than that of the second air ejection unit provided in the downstream region. This makes it difficult for the sheet to come into contact with the upstream end region of the convex curved surface. As a result, it is possible to make it difficult for the sheet to come into contact with the turn section. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a schematic cross-sectional view of a sheet conveying device. [Figure 2] FIG. 2 is a schematic plan view of the sheet conveying device. [Figure 3] FIG. 4 is a schematic cross-sectional view of a turn portion showing the flow of air. [Figure 4] 10 is a schematic cross-sectional view of a turn portion showing the air flow when a first air ejection portion is not provided. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of a sheet conveying device will be described below. It should be noted that the embodiment described here is not intended to limit the scope of the present invention. Furthermore, the drawings are schematic diagrams and do not necessarily faithfully reflect actual products. In the following, the same reference numerals will be used to designate components and parts that perform the same functions, and duplicate descriptions will be omitted or simplified as appropriate.

[0010] [Configuration of sheet transport device] 1 is a schematic cross-sectional view of a sheet conveying apparatus 10. The sheet conveying apparatus 10 is an apparatus that conveys an electrode sheet 1 of a battery. In this specification, the term "battery" refers to a general power storage device that can extract electrical energy, and is a concept that includes primary batteries and secondary batteries, as well as chemical batteries such as lithium-ion secondary batteries and nickel-metal hydride batteries, and physical batteries such as electric double layer capacitors.

[0011] As shown in FIG. 1, the sheet conveying device 10 is configured to turn over the electrode sheet 1 during conveyance. The electrode sheet 1 is formed in a strip shape by coating one surface of an electrode foil 2 with a coating material 3. The electrode sheet 1 has a coated surface 1A coated with the coating material 3 containing an active material, and an uncoated surface 1B on the back side of the coated surface 1A. The illustrated portion of the sheet conveying device 10 here conveys the electrode sheet 1 in a state where the coating material 3 is not yet dried. However, the illustrated portion of the sheet conveying device 10 may also convey the electrode sheet 1 after the coating material 3 has been dried.

[0012] As shown in FIG. 1, the sheet conveying device 10 includes a first conveying section 20 through which the electrode sheet 1 is conveyed, a turn section 30 provided downstream of the first conveying section 20, and a second conveying section 40 provided downstream of the turn section 30. Here, the first conveying section 20 and the second conveying section 40 are each provided substantially horizontally. In the first conveying section 20, the electrode sheet 1 is conveyed with the coated side 1A facing downward. In the turn section 30, the electrode sheet 1 is turned over with the coated side 1A facing inward so that the uncoated side 1B faces downward. The conveying path of the electrode sheet 1 in the turn section 30 extends in a direction including the vertical direction. In the second conveying section 40, the electrode sheet 1 is conveyed with the uncoated side 1B facing downward. The second conveying section 40 is disposed below the first conveying section 20.

[0013] The first conveying section 20 is equipped with an upstream air nozzle 21 that sprays air toward the coated surface 1A of the electrode sheet 1. The first conveying section 20 is configured so that the sprayed air can lift the electrode sheet 1. This prevents the undried (or dried) coating material 3 from coming into contact with the sheet conveying device 10 and causing the coating material 3 to peel off. The upstream air nozzle 21 is disposed below the conveying path of the electrode sheet 1 in the first conveying section 20, and sprays air upward. Upstream conveying rollers 22 are provided above the conveying path of the electrode sheet 1 in the first conveying section 20. The upstream conveying rollers 22 come into contact with the uncoated surface 1B of the electrode sheet 1 and convey the electrode sheet 1 downstream.

[0014] In this embodiment, the upstream air nozzle 21 also functions as a nozzle that sprays air to dry the coating material 3. In this embodiment, the electrode sheet 1 is dried while being transported by the sheet transport device 10. However, the sheet transport device 10 may transport the electrode sheet 1, with the coating material 3 still wet, to a separately provided drying device.

[0015] The turning section 30 has a convex curved surface 31 along which the electrode sheet 1 is turned over. Turning over here means rotating the electrode sheet 1 so that the upper and lower surfaces are interchanged. As shown in FIG. 1 , the convex curved surface 31 is formed to have an arc-shaped cross section. However, the convex curved surface 31 may have other curved shapes along which the electrode sheet 1 can be turned over. The convex curved surface 31 is formed with a first air injection unit 32 provided in the upstream end region 31U and spraying air toward the coated surface 1A of the electrode sheet 1, and a second air injection unit 33 provided in a downstream region 31D of the upstream end region 31U and spraying air toward the coated surface 1A of the electrode sheet 1. The air injected from the first air injection unit 32 and the second air injection unit 33 causes the electrode sheet 1 to float from the convex curved surface 31. The electrode sheet 1 is transported while separated from the convex curved surface 31 and is turned over as it is transported along the convex curved surface 31. In this embodiment, the first air ejection section 32 ejects air so as to generate a greater buoyancy force than the second air ejection section 33. The turn section 30 will be described in detail later.

[0016] The second conveying section 40 is equipped with a downstream air nozzle 41 that sprays air toward the coated surface 1A of the electrode sheet 1. The downstream air nozzle 41 is arranged 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. Downstream conveying rollers 42 are provided below the conveying path of the electrode sheet 1 in the second conveying section 40. The downstream conveying rollers 42 come into contact with the uncoated surface 1B, which has become the lower surface of the electrode sheet 1, and convey the electrode sheet 1 downstream.

[0017] [Turn section configuration] As shown in FIG. 1, the turning section 30 is hollow and has an internal space 31A. FIG. 2 is a schematic plan view of the sheet conveying device 10. As shown in FIG. 2, the first air injection section 32 is formed with a slit 32A that opens in the convex curved surface 31 and extends in the width direction of the electrode sheet 1. As shown in FIG. 1, the internal space 31A and the slit 32A are in communication with each other. The second air injection section 33 is formed with a plurality of air injection holes 33A that open in the convex curved surface 31. The internal space 31A and the plurality of air injection holes 33A are in communication with each other. The aperture ratio of the first air injection section 32 formed with the slit 32A is greater than the aperture ratio of the second air injection section 33 formed with the plurality of air injection holes 33A. In this embodiment, by increasing the aperture ratio, the buoyancy force caused by the air injected from the first air injection section 32 is greater than that of the second air injection section 33.

[0018] 1, the turning section 30 has an air inlet 34 that introduces air into the internal space 31A. The air inlet 34 is connected to a blower fan (not shown). Air supplied from the air inlet 34 to the internal space 31A by the blower fan is sprayed from the slit 32A of the first air spraying section 32 and the plurality of air spray holes 33A of the second air spraying section 33. Note that the air may be supplied not by the blower fan but by, for example, an air compressor that generates compressed air.

[0019] As shown in FIG. 1 , the turning section 30 includes a rectifying plate 35 disposed in the internal space 31A to guide air toward the slit 32A. The rectifying plate 35 increases the air pressure near the slit 32A, thereby increasing the flow rate and pressure of the air injected from the slit 32A. The rectifying plate 35 also increases the buoyancy force of the air injected from the first air injection section 32 compared to the second air injection section 33. The lower end of the rectifying plate 35 is the end on the air inlet 34 side and is configured to cover the upper part of the air inlet 34 in a side view. This allows a portion of the air supplied to the air inlet 34 to be guided toward the slit 32A, increasing the flow rate and pressure of the air injected from the slit 32A. Here, the lower end of the rectifying plate 35 extends below half of the air inlet 34 in a side view. However, the position of the lower end of the rectifying plate 35 is not particularly limited and may be positioned above half of the air inlet 34. The upper end of the rectifying plate 35 is the end on the slit 32A side, and is inclined downstream in the transport direction of the electrode sheet 1 from the vertical direction. Here, the vertical direction is a direction perpendicular to the transport direction and width direction of the electrode sheet 1. As a result, the air sprayed from the slit 32A is sprayed obliquely upward, inclined toward the downstream side in the transport direction of the electrode sheet 1. The angle of the upper end of the rectifying plate 35 with respect to the vertical direction is preferably 10 degrees or more and 45 degrees or less. More preferably, the angle of the upper end of the rectifying plate 35 with respect to the vertical direction is 10 degrees or more and 20 degrees or less.

[0020] As shown in FIG. 2, the length of the slit 32A in the width direction of the electrode sheet 1 is longer than the length of the electrode sheet 1 in the width direction. The width of the slit 32A in the conveyance direction of the electrode sheet 1 is wider at the center than at the ends in the width direction. Here, the slit 32A has a flat octagonal shape that is long in the width direction of the electrode sheet 1 in a plan view. However, the shape of the slit 32A is not particularly limited and may be, for example, a hexagon, a rhombus, a rectangle, an elongated hole with approximately circular ends in the width direction of the electrode sheet 1, or an ellipse. The width of the slit 32A in the conveyance direction of the electrode sheet 1 may be the same regardless of the position in the width direction of the electrode sheet 1. The width of the slit 32A in the conveyance direction of the electrode sheet 1 is preferably 0.2 mm or more and 2 mm or less. The width of the slit 32A in the conveyance direction of the electrode sheet 1 is preferably 0.4 mm or more and 1 mm or less at the ends in the width direction (indicated by L1 in FIG. 2) and is preferably 0.6 mm or more and 2 mm or less at the center in the width direction (indicated by L2 in FIG. 2).

[0021] As shown in Fig. 1, the convex curved surface 31, which has an arc-shaped cross section, extends from its upper vertex further upstream in the conveyance direction of the electrode sheet 1. The first air ejection unit 32 is disposed upstream of the upper vertex of the convex curved surface 31 in the conveyance direction. Preferably, the first air ejection unit 32 is disposed at an angle of no more than 15 degrees upstream in the conveyance direction from the upper vertex of the convex curved surface 31. The angle of the slit 32A with respect to the upper vertex of the convex curved surface 31 is more preferably 10 degrees or more and 15 degrees or less.

[0022] [Effects of the embodiment] The following describes the air flow generated by the sheet conveying device 10 according to this embodiment and the effects achieved thereby. FIG. 3 is a schematic cross-sectional view of the turn section 30 showing the air flow. FIG. 4 is a schematic cross-sectional view of the turn section 130 showing the air flow when the first air injection section 32 is not provided. As shown in FIG. 4, in the turn section 130 without the first air injection section 32, air is injected only from the multiple air injection holes 133A of the second air injection section 133. According to the inventor's findings, as shown in FIG. 4, a portion of the air injected from the second air injection section 133 travels along the gap between the electrode sheet 1 and the turn section 130 and is discharged onto the first conveying section 120 upstream of the turn section 130. This air flow reduces the air pressure near the entrance of the turn section 130, which is close to the first conveying section 120. According to the findings of the inventors of the present application, the air pressure is high at point P1 along the turn section 130, is lower at point P2 upstream of point P1 than point P1, and is even lower at point P3 further upstream of point P2 than point P2. Therefore, the force that lifts the electrode sheet 1 becomes weaker the closer it is to the entrance of the turn section 130, and the electrode sheet 1 is more likely to come into contact with the turn section 130 at a position close to the entrance of the turn section 130.

[0023] Furthermore, according to the findings of the inventors of the present application, negative pressure may occur between the electrode sheet 1 and the turn section 130 in a portion P4 upstream in the conveyance direction from the upper apex of the turn section 130. This makes it even easier for the electrode sheet 1 to come into contact with the turn section 130 near the entrance of the turn section 130.

[0024] In contrast, as shown in FIG. 3 , in this embodiment, the convex curved surface 31 is formed with a first air injection unit 32 provided in the upstream end region 31U and a second air injection unit 33 provided in a region 31D downstream of the upstream end region 31U. The first air injection unit 32 injects air to generate a greater buoyancy force than the second air injection unit 33. By making the buoyancy force of the air injected from the first air injection unit 32 greater than that of the second air injection unit 33, the buoyancy force, which would conventionally be weaker closer to the entrance of the turn section 30, can be increased near the entrance of the turn section 30. This makes it less likely that the electrode sheet 1 will come into contact with the upstream end region 31U of the convex curved surface 31. As a result, it is possible to make it less likely that the electrode sheet 1 will come into contact with the turn section 30.

[0025] Furthermore, the air injected from the first air injection unit 32 prevents the air injected from the second air injection unit 33 from being discharged onto the first conveying unit 20. This prevents a decrease in pressure between the electrode sheet 1 and the turn section 30. This also makes it difficult for the electrode sheet 1 to come into contact with the turn section 30.

[0026] In this embodiment, the first air injection section 32 is configured with a slit 32A that opens in the convex curved surface 31 and extends in the width direction of the electrode sheet 1. On the other hand, the second air injection section 33 is configured with a plurality of air injection holes 33A that open in the convex curved surface 31. With this configuration, the aperture ratio of the first air injection section 32 can be made larger than the aperture ratio of the second air injection section 33. As a result, the buoyancy force caused by the air injected from the first air injection section 32 can be made larger than the buoyancy force caused by the air injected from the second air injection section 33. Furthermore, by configuring the first air injection section 32 with the slit 32A, air can be injected from the first air injection section 32 without interruption. Therefore, the effect of preventing the air from the second air injection section 33 from being discharged onto the first conveying section 20 can be enhanced.

[0027] In this embodiment, the width of the slits 32A is longer than the width of the electrode sheet 1 (see FIG. 2). Therefore, the effect of increasing the buoyancy of the electrode sheet 1 by the air injected from the first air injection unit 32 can be exerted across the entire width of the electrode sheet 1.

[0028] Furthermore, in this embodiment, the turning section 30 includes an internal space 31A that communicates with the slit 32A and the plurality of air injection holes 33A, an air inlet 34 that introduces air into the internal space 31A, and a rectifying plate 35 that is provided in the internal space 31A and guides the air toward the slit 32A. As described above, the rectifying plate 35 can increase the flow rate and pressure of the air injected from the slit 32A. This can further increase the force that lifts the electrode sheet 1 in the upstream end region 31U of the convex curved surface 31.

[0029] Furthermore, in this embodiment, the end of the rectifying plate 35 on the slit 32A side is inclined downstream in the conveyance direction of the electrode sheet 1 rather than vertical. Therefore, the air from the first air injection unit 32 is injected in a direction inclined downstream in the conveyance direction of the electrode sheet 1. As a result, the air is injected from the first air injection unit 32 toward the second air injection unit 33, which increases the effect of preventing the air injected from the second air injection unit 33 from being discharged onto the first conveyance unit 20. As a result, the risk of the electrode sheet 1 coming into contact with the turn unit 30 can be further reduced.

[0030] In this embodiment, the width of the slit 32A in the conveyance direction of the electrode sheet 1 is configured to be wider at the center than at the ends in the width direction (see FIG. 2). This increases the amount of air injected from the center in the width direction of the slit 32A. Air is more likely to escape to the outside at the ends in the width direction of the slit 32A than at the center in the width direction. This shape of the slit 32A makes it possible to increase the amount of air in the center in the width direction, where air is less likely to escape, and to decrease the amount of air at the ends in the width direction, where air is more likely to escape. As a result, the amount of air required to lift the electrode sheet 1 can be increased.

[0031] The width of slit 32A in the conveyance direction of electrode sheet 1 is preferably 2 mm or less. By making the width of slit 32A 2 mm or less, the air pressure near slit 32A in internal space 31A increases. This increases the pressure of the air injected from slit 32A, making it possible to maintain a large force for floating electrode sheet 1.

[0032] In this embodiment, the first air injection unit 32 is disposed upstream in the conveying direction from the upper apex of the convex curved surface 31. As a result, air injected from the first air injection unit 32 is supplied to the upstream portion (corresponding to P4 in FIG. 4) of the upper apex of the turn section 30, where the air pressure is particularly likely to be low and may even become negative pressure. Therefore, the air pressure in this upstream portion is kept high. When the first air injection unit 32 is disposed at the upper apex of the turn section 30 or downstream of the apex, negative pressure is generated upstream of the apex, and the buoyancy is reduced compared to when the first air injection unit 32 is disposed upstream of the apex.

[0033] Preferably, the first air injection unit 32 is disposed at a position within 15 degrees upstream in the conveying direction from the upper vertex of the convex curved surface 31. The larger the angle of the first air injection unit 32 relative to the upper vertex of the convex curved surface 31, the less likely negative pressure will be generated upstream of the vertex, but the distance between the first air injection unit 32 and the electrode sheet 1 will be longer. Therefore, the force of the air injected from the first air injection unit 32 to lift the electrode sheet 1 will be weaker. When the first air injection unit 32 is disposed at a position within 15 degrees upstream in the conveying direction from the upper vertex of the convex curved surface 31, a good balance is achieved between the difficulty in generating negative pressure and the force of the air injected from the first air injection unit 32 to lift the electrode sheet 1, and the force to lift the electrode sheet 1 can be maintained at a high level.

[0034] The above describes one embodiment of the sheet conveying device proposed herein. However, the above embodiment is merely an example, and the present invention can be embodied in other ways. The above embodiment does not limit the present invention unless specifically stated otherwise. Furthermore, the technology disclosed herein can be modified in various ways, and the components and processes described herein can be omitted or combined as appropriate, provided that no particular problems arise.

[0035] For example, the sheet conveying device is not limited to conveying battery electrode sheets, but may also convey other strip-shaped sheets. For example, the convex curved surface on which the first air injection unit is provided may be semicircular or arc-shaped, and the upstream end region is not limited to being upstream of the upper vertex of the arc. The shape of the first air injection unit is not limited to a slit. The first air injection unit may be configured, for example, with multiple holes arranged in the width direction of the sheet. The first conveying unit may be configured to convey the sheet with the coating unit facing down, and may convey the sheet in a direction other than horizontal. The second conveying unit may also be configured to convey the sheet with the coating unit facing up, and may convey the sheet in a direction other than horizontal.

[0036] Furthermore, for example, the sheet conveying device does not need to be configured so that the buoyancy force of the first air ejection unit is greater than that of the second air ejection unit. If the air ejected from the first air ejection unit prevents the air ejected from the second air ejection unit from being discharged onto the first conveying unit, the decrease in pressure between the electrode sheet and the turn unit is suppressed. This reduces the risk of the electrode sheet coming into contact with the turn unit.

[0037] This specification includes the disclosures set forth in the following sections:

[0038] Section 1: a first conveying section in which a strip-shaped sheet having a first surface and a second surface opposite to the first surface is conveyed with the first surface facing down; a turning unit provided downstream of the first conveying unit and configured to turn the sheet over so that the first surface faces inward and the second surface faces downward; a second conveying section provided downstream of the turning section, through which the sheet is conveyed with the second surface facing downward; the first conveying unit includes an air nozzle that sprays air toward the first surface of the sheet, and is configured to be able to float the sheet by the sprayed air; the turning portion has a convex curved surface along which the sheet is turned over, a first air ejection portion provided in an upstream end region on the convex curved surface and configured to eject air toward the first surface of the sheet; and a second air ejection portion provided in a downstream region of the upstream end region and configured to eject air toward the first surface of the sheet, The first air injection unit injects air so as to generate a greater buoyancy force than the second air injection unit. Sheet transport device.

[0039] Section 2: the first air ejection section is formed of a slit that opens in the convex curved surface and extends in the width direction of the sheet, The second air injection section is composed of a plurality of air injection holes opening on the convex curved surface. Item 1. A sheet conveying device according to item 1.

[0040] Section 3: The length of the slit in the width direction is longer than the length of the sheet in the width direction. Item 3. The sheet conveying device according to item 2.

[0041] Section 4: The turn portion is an internal space communicating with the slit and the plurality of air injection holes; an air inlet for introducing air into the internal space; a rectifying plate provided in the internal space and guiding air toward the slit, Item 2 or 3. The sheet conveying device according to item 2 or 3.

[0042] Section 5: an end portion of the straightening plate on the slit side is inclined toward the downstream side in the sheet conveying direction from the vertical direction; Item 5. A sheet conveying device according to item 4.

[0043] Item 6: a width of the slit in a conveying direction of the sheet is wider at a center portion than at an end portion in the width direction; Item 6. The sheet conveying device according to any one of items 2 to 5.

[0044] Section 7: The width of the slit in the sheet conveying direction is 2 mm or less. Item 7. The sheet conveying device according to any one of items 2 to 6.

[0045] Section 8: the convex curved surface is formed to have an arc-shaped cross section, and extends from an upper vertex further upstream in the sheet conveying direction, the first air ejection unit is disposed upstream of an upper vertex of the convex curved surface in the conveying direction. 8. The sheet conveying device according to any one of items 1 to 7.

[0046] Section 9: the first air ejection unit is disposed at a position within 15 degrees upstream of the upper vertex of the convex curved surface in the conveying direction. Item 9. The sheet conveying device according to item 8.

[0047] Section 10: the sheet is an electrode sheet for a battery, The first surface is coated with a coating material containing an active material. 10. The sheet conveying device according to any one of items 1 to 9. [Explanation of symbols]

[0048] 1 Electrode sheet (sheet) 1A Coated surface (first surface) 1B Uncoated side (2nd side) 2 Electrode foil 3 Coating materials 10. Sheet transport device 20 First conveying section 21 Upstream air nozzle (air nozzle) 22 Upstream transport roller 30 Turn Section 31 Convex curved surface 31A Internal space 31D Downstream area 31U Upstream end area 32 First air injection section 32A Slit 33 Second air injection section 33A Air injection hole 34 Air inlet 35 Rectifier plate 40 Second conveying section 41 Downstream air nozzle 42 downstream transport roller

Claims

1. a first conveying section in which a strip-shaped sheet having a first surface and a second surface opposite to the first surface is conveyed with the first surface facing down; a turning unit provided downstream of the first conveying unit and configured to turn the sheet over so that the first surface faces inward and the second surface faces downward; a second conveying section provided downstream of the turning section, through which the sheet is conveyed with the second surface facing downward; the first conveying unit includes an air nozzle that sprays air toward the first surface of the sheet, and is configured to be able to float the sheet by the sprayed air; The turning portion has a convex curved surface along which the sheet is turned over, a first air ejection portion provided in an upstream end region on the convex curved surface and configured to eject air toward the first surface of the sheet; and a second air ejection portion provided in a downstream region of the upstream end region and configured to eject air toward the first surface of the sheet, the first air injection unit is formed of a slit that opens in the convex curved surface and extends in the width direction of the sheet, and injects air so as to generate a greater buoyancy force than the second air injection unit; the second air injection section is composed of a plurality of air injection holes opening in the convex curved surface, a width of the slit in a conveying direction of the sheet is wider at a center portion than at an end portion in the width direction; Sheet transport device.

2. The length of the slit in the width direction is longer than the length of the sheet in the width direction. The sheet transport device according to claim 1 .

3. The turn portion is an internal space communicating with the slit and the plurality of air injection holes; an air inlet for introducing air into the internal space; a rectifying plate provided in the internal space and guiding air toward the slit, The sheet transport device according to claim 1 .

4. an end portion of the straightening plate on the slit side is inclined toward the downstream side in the sheet conveying direction from the vertical direction; The sheet transport device according to claim 3 .

5. The width of the slit in the sheet conveying direction is 2 mm or less. The sheet transport device according to claim 1 .

6. A first conveying section in which a strip-shaped sheet having a first surface and a second surface behind the first surface is conveyed with the first surface facing down; a turning unit provided downstream of the first conveying unit and configured to turn the sheet over so that the first surface faces inward and the second surface faces downward; a second conveying section provided downstream of the turning section, through which the sheet is conveyed with the second surface facing downward; the first conveying unit includes an air nozzle that sprays air toward the first surface of the sheet, and is configured to be able to float the sheet by the sprayed air; The turning portion has a convex curved surface along which the sheet is turned over, a first air ejection portion provided in an upstream end region on the convex curved surface and configured to eject air toward the first surface of the sheet; and a second air ejection portion provided in a downstream region of the upstream end region and configured to eject air toward the first surface of the sheet, the first air injection unit injects air so as to generate a greater buoyancy force than the second air injection unit, the convex curved surface is formed to have an arc-shaped cross section, and extends from an upper vertex further upstream in the sheet conveying direction, the first air ejection unit is disposed upstream of an upper vertex of the convex curved surface in the conveying direction. Sheet transport device.

7. the first air ejection unit is disposed at a position within 15 degrees upstream of the upper vertex of the convex curved surface in the conveying direction. The sheet transport device according to claim 6 .

8. the sheet is an electrode sheet for a battery, The first surface is coated with a coating material containing an active material. The sheet transport device according to any one of claims 1 to 7.

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