Sheet conveying device

Abstract

To stabilize the folding of a belt-like sheet.SOLUTION: A sheet conveying device 10 according to the present invention includes an air turn bar 20 and a hood 30. The air turn bar 20 turns back a strip-shaped sheet A conveyed along a predetermined conveying path. The hood 30 has an inner peripheral surface 31 that faces the outer peripheral surface of the air turn bar 20. An outer peripheral surface of the air turn bar 20 is formed with ejection holes 25 that blow air toward one side of the sheet A. The inner peripheral surface 31 of the hood 30 is formed with suction holes 35 that suck air from the other side of the sheet A.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Japanese Patent Application Laid-Open Publication No. 2023-003004 discloses a drying device that dries conveyed objects by spraying gas onto them. The drying device disclosed in this publication is equipped with an air turn bar for changing the direction of the conveyed objects. The air turn bar has a wall portion and a straightening portion. Gas is sprayed from the wall portion. The straightening portion has a flat surface that extends the wall surface of the wall portion upstream in the conveying direction. It is said that such a drying device can prevent wrinkles from occurring in the conveyed objects.

[0003] JP 2021-050051 A discloses a turn bar comprising a turn bar main body and a back surface support part. The turn bar main body has an injection surface with multiple injection ports. The turn bar main body injects a first gas, which is pressurized from the outside, from the multiple injection ports toward the surface of the substrate, changing the transport direction of the substrate while floating the substrate from the injection surface. The back surface support part is provided on the opposite side of the floated portion of the substrate that has been floated from the injection surface. The back surface support part supports the entire back surface of the floated portion of the substrate. It is said that such a turn bar uniforms the amount of floating of the substrate and stably changes the transport direction of the substrate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-003004 [Patent Document 2] Patent Publication No. 2021-050051 Summary of the Invention [Problem to be solved by the invention]

[0005] When the strip-shaped sheet is folded back by the air turn bar, if the folding of the sheet is not stable, there is a risk that the sheet may come into contact with the air turn bar. [Means for solving the problem]

[0006] The sheet conveying device disclosed herein includes an air turn bar and a hood. The air turn bar folds back a strip-shaped sheet being conveyed along a predetermined conveying path. The hood has an inner peripheral surface that faces the outer peripheral surface of the air turn bar. The outer peripheral surface of the air turn bar is formed with outlet holes that blow air toward one side of the sheet. The inner peripheral surface of the hood is formed with suction holes that suck air from the other side of the sheet. This sheet conveying device stabilizes the folding back of the sheet. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram of a sheet conveying device 10. As shown in FIG. [Figure 2] FIG. 2 is a schematic cross-sectional view of the air turn bar 20 and the hood 30. As shown in FIG. [Figure 3] FIG. 3 is a schematic plan view of the air turn bar 20. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the technology disclosed herein will now be described with reference to the drawings. The embodiment described herein is, of course, not intended to limit the present invention. The drawings are schematic and do not necessarily reflect the actual product. Furthermore, components and parts that perform the same function are appropriately designated by the same reference numerals, and redundant explanations will be omitted where appropriate. In the following description, the reference numerals L, R, F, Rr, U, and D in the drawings represent left, right, front, rear, top, and bottom. However, these directions are merely provided for the convenience of explanation and do not limit the present invention in any way.

[0009] Fig. 1 is a schematic diagram of a sheet conveying device 10. Fig. 2 is a schematic cross-sectional view of an air turn bar 20 and a hood 30. Fig. 3 is a schematic plan view of the air turn bar 20. In Figs. 1 to 3, the direction in which the sheet A is conveyed is indicated by an arrow. In Figs. 1 and 2, the direction in which air is blown out is indicated by an outline arrow.

[0010] <Sheet conveying device 10> The sheet conveying apparatus 10 is an apparatus that conveys a strip-shaped electrode sheet (hereinafter also simply referred to as a "sheet") A used as an electrode for an electricity storage device. In this specification, the term "electricity storage device" is a concept that encompasses devices in which a charge / discharge reaction occurs as charge carriers move between a pair of electrodes (positive and negative electrodes). In other words, the electricity storage device in the technology disclosed herein encompasses secondary batteries such as lithium ion secondary batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, as well as capacitors such as lithium ion capacitors and electric double layer capacitors.

[0011] As shown in FIG. 1, sheet A includes a current collector foil and a coated portion. The current collector foil is a strip-shaped metal foil. The coated portion is a layer containing an active material, and is applied to one side of the current collector foil. A coating device (not shown) that applies the coating to one side of the current collector foil is provided upstream of the sheet conveying device 10. The coating device can be a conventionally known device used in the manufacture of electrode sheets for electricity storage devices, and therefore a detailed description thereof will be omitted.

[0012] Sheet A has an uncoated surface A1, which is not coated with a coated portion, and a coated surface A2, which is coated with a coated portion. Conventional known materials can be used as materials for the current collector foil and the coated portion, and detailed explanations will be omitted. In sheet A, the coated portion is applied to the current collector foil and then dried. In this embodiment, sheet A, including the coated portion before drying, is dried while being conveyed by sheet conveying device 10. It should be noted that sheet conveying device 10 may also convey sheet A, including the coated portion after drying.

[0013] The sheet conveying device 10 includes an air turn bar 20 and a hood 30. The sheet conveying device 10 also includes free rollers 40 and 41. The sheet conveying device 10 conveys a sheet A along a predetermined conveying path. The conveying path of the sheet A is set by the air turn bar 20 and the free rollers 40 and 41. The conveying path of the sheet A includes a first conveying section 11, a first folding section 12, a second conveying section 13, a second folding section 14, and a third conveying section 15. The sheet A is conveyed in the order of the first conveying section 11, the first folding section 12, the second conveying section 13, the second folding section 14, and the third conveying section 15. The second conveying section 13 is located below the first conveying section 11. The third conveying section 15 is located below the first conveying section 11 and the second conveying section 13.

[0014] The first conveying section 11, the second conveying section 13, and the third conveying section 15 are provided with a plurality of drying nozzles 50 for drying the coated surface A2 of the sheet A. The plurality of drying nozzles 50 are provided intermittently along the conveying direction. The sheet A is dried by the drying nozzles 50 while being conveyed by the sheet conveying device 10. The drying nozzles 50 are configured to blow air toward the coated surface A2. The configuration of the drying nozzles 50 is not particularly limited, but a plurality of air blowing holes may be provided along the width direction of the sheet A so that air can be applied approximately uniformly along the width direction of the sheet A (the direction perpendicular to the conveying direction). A plurality of free rollers 40 are provided at positions corresponding to the drying nozzles 50 across the sheet A. The sheet A is conveyed with the non-coated surface A1 aligned along the plurality of free rollers 40.

[0015] In the first conveying section 11, the sheet A is conveyed substantially horizontally forward with the non-coated side A1 facing downward and the coated side A2 facing upward. A drying nozzle 50 is provided at a distance from the sheet A in a position opposite the coated side A2 (above the coated side A2). The coated side A2 is dried by air sprayed from the drying nozzle 50. The non-coated side A1 is supported by a free roller 40 provided on the opposite side (below) of the drying nozzle 50. Because the non-coated side A1 is supported by the free roller 40, the sheet A is less likely to sag even when air is sprayed onto the coated side A2. This maintains the horizontality of the sheet A and suppresses vibration of the sheet A, which tends to improve the quality of the dried sheet A.

[0016] In the first folding section 12, the sheet A is folded back by free rollers 41. In this embodiment, the sheet A is folded back by two free rollers 41. The sheet A is folded back with the non-coated surface A1 aligned with the free rollers 41. The two free rollers 41 face each other in the vertical direction. The upper end of the upper free roller 41 is set at approximately the same height as the upper ends of the free rollers 40 of the first conveying section 11. The lower end of the lower free roller 41 is set at approximately the same height as the lower ends of the free rollers 40 of the second conveying section 13, which will be described later. The sheet A that has been conveyed forward is guided downward by the free rollers 41. Thereafter, the sheet A is guided backward by the free rollers 41.

[0017] In the second conveying section 13, the sheet A folded back by the first folding section 12 is conveyed substantially horizontally rearward with the non-coated side A1 facing up and the coated side A2 facing down. As in the first conveying section 11, a drying nozzle 50 is provided at a distance from the sheet A in a position opposite the coated side A2 (below the coated side A2). The coated side A2 is dried by air sprayed from the drying nozzle 50. The non-coated side A1 is supported by free rollers 40 provided on the opposite side (above) of the drying nozzle 50. The provision of the free rollers 40 in the second conveying section 13 makes it easier to maintain the horizontality of the sheet A and to suppress vibration of the sheet A.

[0018] In the second folding section 14, the sheet A is folded back by the air turn bar 20. The sheet A is folded back with the coated surface A2 facing inward and the uncoated surface A1 facing outward so that the coated surface A2 faces the air turn bar 20. In this embodiment, the sheet A is folded back with a gap between it and the air turn bar 20. In other words, the sheet A is folded back while floating above the air turn bar 20 so as not to come into contact with the air turn bar 20. The folded sheet A is then transported forward again.

[0019] In the third conveying section 15, the sheet A folded by the second folding section 14 is conveyed forward in a substantially horizontal manner with the non-coated side A1 facing downward and the coated side A2 facing upward. As in the first conveying section 11, a drying nozzle 50 is provided at a distance from the sheet A in a position opposite the coated side A2 (above the coated side A2). The coated side A2 is dried by air sprayed from the drying nozzle 50. The non-coated side A1 is supported by free rollers 40 provided on the opposite side (below) of the drying nozzle 50. The provision of the free rollers 40 in the third conveying section 15 makes it easier to maintain the horizontality of the sheet A and to suppress vibration of the sheet A.

[0020] The sheet A conveyed by the sheet conveying device 10 is dried in the coated portion, and then goes through processes such as pressing and tab processing to produce an electrode sheet.

[0021] The air turn bar 20 and the hood 30 provided on the second folded portion 14 will be described below.

[0022] Air Turn Bar 20 The air turn bar 20 folds back the strip-shaped sheet A being transported along the transport path described above. In this embodiment, the air turn bar 20 folds back the transported sheet A in the opposite direction. The air turn bar 20 extends in a direction (left-right direction) perpendicular to the direction in which the sheet A is transported (see FIG. 3). As shown in FIG. 2, the air turn bar 20 has a base 21, a protruding portion 22, and a side portion 23. The protruding portion 22 protrudes rearward from the base 21 in a cross-sectional arc shape. An internal space 20a surrounded by the base 21, the protruding portion 22, and the side portion 23 is formed inside the air turn bar 20. In other words, the air turn bar 20 is hollow.

[0023] The base 21 is a flat surface extending in the up-down and left-right directions (see FIG. 3). The base 21 is generally rectangular. An air inlet hole 21a is provided in the approximate center of the base 21. An air supply device 21b is connected to the air inlet hole 21a. The air supply device 21b is not particularly limited as long as it can introduce air into the internal space 20a. For example, a blower fan, a compressor, or the like can be used as the air supply device 21b. A protrusion 22 and a side surface 23 extend rearward from the outer peripheral edge of the base 21.

[0024] The protruding portion 22 has a semicircular cross-sectional portion (semicircular portion) 22a in a plan view along the extension direction of the air turn bar 20. The protruding portion 22 also has an upstream portion 22b extending from the semicircular portion 22a to the upstream side in the conveying direction of the sheet A, and a downstream portion 22c extending from the semicircular portion 22a to the downstream side in the conveying direction. The upstream portion 22b is approximately parallel to the conveying direction in the second conveying section 13. The upstream portion 22b is connected to the upper end of the base portion 21. The downstream portion 22c is connected to the lower end of the base portion 21. An ejection hole 25 is formed in the protruding portion 22 of the outer peripheral surface of the air turn bar 20. The ejection hole 25 is a hole for ejecting air toward one surface of the sheet (in this embodiment, the coated surface A2). The ejection holes 25 are open in the protruding portion 22 and communicate with the internal space 20a of the air turn bar 20. A plurality of ejection holes 25 are provided in the protruding portion 22.

[0025] The plurality of nozzle holes 25 are provided in the semicircular portion 22a. The nozzle holes 25 are substantially circular openings. The shape of the nozzle holes 25 is not limited to a circle, and may be an ellipse, a polygon, or the like. As shown in FIGS. 2 and 3, the nozzle holes 25 are provided intermittently in the direction in which the air turn bar 20 extends and in the direction in which the semicircular portion 22a curves. To ensure that air is evenly applied to the sheet A, the nozzle holes 25 may be provided at substantially the same pitch in a position of the semicircular portion 22a facing the sheet A. Air is ejected from the nozzle holes 25 toward the sheet A. Air is ejected from the nozzle holes 25 in a direction substantially perpendicular to the outer peripheral surface of the semicircular portion 22a. This allows air to be sprayed onto the coated surface A2 of the sheet A. The sheet A can be folded back while floating above the outer peripheral surface of the air turn bar 20. Furthermore, the coated surface A2 can be dried by blowing air onto the coated surface A2.

[0026] In this embodiment, upstream ejection holes 26 are formed in the upstream portion 22b of the protrusion 22. The upstream ejection holes 26 communicate with the internal space 20a of the air turn bar 20 (see FIG. 2). As shown in FIG. 3, the upstream ejection holes 26 are slit-shaped and open along the extension direction of the air turn bar 20. In this embodiment, the upstream ejection holes 26 are longer than the length of the sheet A in the width direction. The width of the upstream ejection holes 26 in the conveying direction of the sheet A is wider at the center than at the ends in the width direction. Here, the upstream ejection holes 26 are substantially rectangular in shape that is long in the width direction of the sheet A in a plan view. However, the shape of the upstream ejection holes 26 is not particularly limited and may be, for example, a polygon, a rhombus, an elongated hole with substantially circular ends in the width direction of the sheet A, an ellipse, or the like. The upstream ejection holes 26 do not necessarily have to be slit-shaped and may be similar to the ejection holes 25.

[0027] In this embodiment, the aperture ratio of the upstream portion 22b formed by the upstream nozzle holes 26 is greater than the aperture ratio of the semicircular portion 22a formed by the plurality of nozzle holes 25. The aperture ratio can be calculated as the aperture area per unit area. By increasing the aperture ratio of the upstream portion 22b, the buoyancy force of the air ejected from the upstream portion 22b can be greater than the buoyancy force of the semicircular portion 22a.

[0028] As shown in Fig. 2, a rectifying plate 27 that guides air toward the upstream nozzle holes 26 is provided inside the air turn bar 20. The rectifying plate 27 sets the direction of the air toward the upstream nozzle holes 26. In this embodiment, the rectifying plate 27 extends downward from the upper end of the upstream section 22b. The rectifying plate 27 extends downward from the upper end of the upstream section 22b, and is inclined forward at its upper end. As a result, the direction of the air ejected from the upstream nozzle holes 26 is set obliquely upward (rearward and upward).

[0029] The side surface portions 23 are portions that close the sides of the air turn bar 20. The side surface portions 23 are provided at both ends in the direction in which the air turn bar 20 extends. The side surface portions 23 are connected to the ends of the base portion 21 and the protrusion portion 22 in the direction in which the air turn bar 20 extends. The shape of the side surface portions 23 corresponds to the shapes of the base portion 21 and the protrusion portion 22. In this embodiment, the side surface portions 23 are approximately semicircular.

[0030] When air is supplied to the internal space 20a of the air turn bar 20, the pressure in the internal space 20a increases, and air is ejected from the nozzle holes 25 and the upstream nozzle holes 26. Air is ejected toward the sheet A from the nozzle holes 25 and the upstream nozzle holes 26 provided on the outer peripheral surface (protrusion 22) of the air turn bar 20, and the sheet A is folded back while air is being ejected. As a result, the sheet A is folded back in a state where it is floating above the outer peripheral surface of the air turn bar 20 so as not to come into contact with the air turn bar 20. At the position where the sheet A is folded back, the outside of the sheet A is covered by the hood 30.

[0031] <Food 30> The hood 30 has an inner peripheral surface 31 that faces the outer peripheral surface of the air turn bar 20 (in this embodiment, the protruding portion 22). The inner peripheral surface 31 of the hood 30 is shaped to follow the protruding portion 22 of the air turn bar 20. The inner peripheral surface 31 of the hood 30 has a facing portion 31b that faces the upstream portion 22b of the air turn bar 20. The inner peripheral surface 31 of the hood 30 has a portion 31a that faces the semicircular portion 22a of the air turn bar 20 and a portion 31c that faces the downstream portion 22c. In this embodiment, in a cross-sectional view taken along the extension direction of the air turn bar 20, the portion 31a of the inner peripheral surface 31 of the hood 30 that faces the semicircular portion 22a is approximately semicircular. The facing portion 31b of the inner peripheral surface 31 of the hood 30 that faces the upstream portion 22b is approximately flat. A portion 31c of the inner peripheral surface 31 of the hood 30, which faces the downstream portion 22c, is substantially flat. An internal space 30a is formed inside the hood 30. In other words, the hood 30 is hollow.

[0032] The hood 30 is provided with a hose flange 32. A suction hole is formed in the hose flange 32, and an air suction device 32a is connected to the hose flange 32. The air suction device 32a reduces the pressure in the internal space 30a to a level lower than the external space. The air suction device 32a is not particularly limited as long as it can suck air from the internal space 30a of the hood 30. For example, a vacuum pump or the like can be used as the air suction device 32a.

[0033] Suction holes 35 are formed in the inner peripheral surface 31 of the hood 30. The suction holes 35 are holes that suck air from the other surface of the sheet A (in this embodiment, the non-coated surface A1). A plurality of suction holes 35 are provided in the inner peripheral surface 31 of the hood 30. In this embodiment, the suction holes 35 are formed in a region of the inner peripheral surface 31 of the hood 30 that faces the outer peripheral surface (protrusion 22) of the air turn bar 20. The suction holes 35 are substantially circular openings. The shape of the suction holes 35 is not limited to a circular shape and may be an elliptical shape, a polygonal shape, or the like. The plurality of suction holes 35 are provided intermittently in the width direction and in the direction in which the inner peripheral surface 31 curves. From the viewpoint of uniformly sucking the sheet A, the plurality of suction holes 35 may be provided at substantially the same pitch in the position of the inner peripheral surface 31 that faces the sheet A.

[0034] When a sheet is folded back by an air turn bar provided with air outlet holes, the sheet may flap due to the air being blown out. If the sheet flap, there is a risk that the sheet may come into contact with the air turn bar. If the sheet comes into contact with the air turn bar, the contacting area may be damaged, which may result in a decrease in the quality of the produced electrode sheet.

[0035] In the above-described embodiment, the sheet conveying device 10 includes an air turn bar 20 and a hood 30. The air turn bar 20 turns back the strip-shaped sheet A conveyed along a predetermined conveyance path. The hood 30 has an inner peripheral surface 31 that faces the outer peripheral surface of the air turn bar 20 (the protrusion 22 in this embodiment). The outer peripheral surface of the air turn bar 20 is formed with outlet holes 25 that blow air toward one side of the sheet A (the coated side A2 in this embodiment). The inner peripheral surface 31 of the hood 30 is formed with suction holes 35 that suck air from the other side of the sheet A (the non-coated side A1 in this embodiment). In this sheet conveying device 10, air is blown out from the outlet holes 25 of the air turn bar 20, making it less likely that the coated side A2 of the sheet A will come into contact with the air turn bar 20. Furthermore, because air is sucked through the suction holes 35 of the hood 30, the sheet A is also sucked from the non-coated side A1. This makes it more difficult for the coated surface A2 of the sheet A to come into contact with the air turn bar 20. In addition, by blowing air onto the sheet A from the coated surface A2 side and sucking it from the uncoated surface A1 side, it is possible to reduce the amount of air blown from the air turn bar 20 side. This reduces flapping of the sheet A. By making it more difficult for the coated surface A2 of the sheet A to come into contact with the air turn bar 20, the coated surface A2 of the sheet A is less likely to be damaged, improving the quality of the electrode sheet produced.

[0036] In the above-described embodiment, the outer peripheral surface of the air turn bar 20 has a portion (semicircular portion) 22a formed with a semicircular cross section. The air turn bar 20 folds the conveyed sheet A in the opposite direction. By folding the sheet A in the opposite direction, the conveying path of the sheet A can be lengthened in a limited space. This allows the size of the equipment for processing the sheet A to be reduced. Note that the sheet A does not necessarily have to be folded in the opposite direction, and may be folded at any angle. The outer peripheral surface of the air turn bar 20 does not necessarily have to have a semicircular cross section, and may have, for example, a fan-shaped cross section.

[0037] In the above-described embodiment, the outer peripheral surface of the air turn bar 20 has an upstream portion 22b that extends from a portion 22a formed with a semicircular cross section to the upstream side in the conveyance direction of the sheet A. The upstream portion 22b is formed with upstream nozzles 26 that spray air toward one side of the sheet A. According to the knowledge of the inventors, negative pressure is likely to be generated upstream of the air turn bar 20 where the sheet A begins to fold. As a result, the sheet A is likely to be drawn downward toward the air turn bar 20. The formation of the upstream nozzles 26 in the upstream portion 22b of the air turn bar 20 can increase the buoyancy force at the position where the sheet A begins to fold. As a result, the position where the sheet A begins to fold is less likely to come into contact with the air turn bar 20.

[0038] In the above-described embodiment, the suction holes 35 are formed in an area of ​​the inner peripheral surface 31 of the hood 30 that faces the outer peripheral surface (protrusion 22) of the air turn bar 20. The suction holes 35 can be formed in an area of ​​the inner peripheral surface 31 of the hood 30 that faces at least the folded end 22d of the outer peripheral surface (protrusion 22) of the air turn bar 20. Due to tension and the like applied when the sheet A is conveyed, the sheet A is likely to come into contact with the folded end 22d of the air turn bar 20. By forming the suction holes 35 in an area that faces the folded end 22d, the air turn bar 20 and the sheet A are less likely to come into contact with each other.

[0039] As shown in FIG. 2 , the sheet conveying device 10 includes a plurality of guide rollers 60. Each of the guide rollers 60 is a cylindrical roller with a rotation axis set along the width direction of the sheet A. The guide rollers 60 are not connected to a drive device or the like and rotate independently. The guide rollers 60 are provided between the outer peripheral surface (protrusion 22) of the air turn bar 20 and the inner peripheral surface 31 of the hood 30. The guide rollers 60 are aligned along the outer peripheral surface (protrusion 22) of the air turn bar 20 and the inner peripheral surface 31 of the hood 30. The guide rollers 60 are arranged in an arc shape with intervals between them. In this embodiment, the guide rollers 60 are supported by side walls 33 in the conveying path of the sheet A, which are provided to cover both ends of the sheet A in the width direction. The side walls 33 face each other in the left-right direction across the conveying path of the sheet A. The support form of the guide rollers 60 is not particularly limited.

[0040] The sheet A passes between a plurality of guide rollers 60 and the air turn bar 20. The guide rollers 60 are so-called free rollers, and can rotate following the sheet A conveyed along the outer circumferential surface of the guide rollers 60.

[0041] The sheet A is pushed in the direction from the outer peripheral surface of the air turn bar 20 toward the inner peripheral surface 31 of the hood 30 by the air blown out from the outlet holes 25 of the air turn bar 20 and the suction from the suction holes 35 of the hood 30. In this embodiment, multiple guide rollers 60 are provided on the outer side (non-coated surface A1 side) of the sheet A. This allows the sheet A to be transported while in contact with the multiple guide rollers 60. As a result, flapping of the sheet A during transport is suppressed. In addition, since the distance between the coated surface A2 and the air turn bar 20 is more easily maintained, the risk of contact between the sheet A and the air turn bar 20 can be reduced.

[0042] As described above, negative pressure is likely to occur upstream of the air turn bar 20 where the sheet A begins to fold. By forming the upstream outlet holes 26 in the upstream portion 22b of the air turn bar 20, the buoyancy force is increased at the position where the sheet A begins to fold. In this embodiment, multiple guide rollers 60 are also provided between the opposing portion 31b of the inner peripheral surface 31 of the hood 30 and the upstream portion 22b of the outer peripheral surface (protrusion 22) of the air turn bar 20. This allows the sheet A to be pressed against the guide rollers 60 and to easily follow the guide rollers 60, even if the buoyancy force is increased at the position where the sheet A begins to fold. As a result, flapping of the sheet A is suppressed, and the conveyance of the sheet A becomes more stable.

[0043] In the above-described embodiment, the sheet conveying device 10 has been described as being configured to fold a sheet A having an uncoated surface A1 and a coated surface A2. However, the folded sheet A is not limited to this configuration. The sheet conveying device 10 may be used, for example, to fold a sheet having a coated surface on both sides or a sheet having no coated surface. Since the sheet is less likely to come into contact with the air turn bar, the sheet is less likely to be damaged when being folded. This can improve the quality of products manufactured using the sheet. Furthermore, the sheet conveying path is not limited to the path including the first conveying section 11, the first folding section 12, the second conveying section 13, the second folding section 14, and the third conveying section 15. The technology disclosed herein can be used when the conveying path is configured so that the sheet is folded by the air turn bar. The angle at which the sheet is folded is not particularly limited.

[0044] The technology disclosed herein has been described in various ways. Unless otherwise specified, the embodiments and the like described herein do not limit the present invention. Furthermore, the technology disclosed herein can be modified in various ways, and as long as no particular problems arise, each component and each process described herein can be omitted or combined as appropriate. Furthermore, this specification includes the disclosures described in the following sections.

[0045] Section 1: an air turn bar that turns back a strip-shaped sheet conveyed along a predetermined conveyance path; a hood having an inner peripheral surface facing the outer peripheral surface of the air turn bar; Equipped with The outer peripheral surface of the air turn bar is formed with an ejection hole for ejecting air toward one surface of the sheet, The inner peripheral surface of the hood is formed with suction holes for sucking air from the other surface of the sheet. Sheet transport device.

[0046] Section 2: Item 1. The sheet conveying device according to item 1, further comprising a plurality of guide rollers arranged along the outer peripheral surface of the air turn bar and the inner peripheral surface of the hood.

[0047] Section 3: The outer peripheral surface of the air turn bar has a portion formed in a semicircular cross section, 3. The sheet conveying device according to item 1 or 2, wherein the air turn bar turns the conveyed sheet in the opposite direction.

[0048] Section 4: the outer peripheral surface of the air turn bar has an upstream portion extending from the part formed in the semicircular cross section to the upstream side in the conveyance direction of the sheet, Item 4. The sheet conveying device according to item 3, wherein the upstream portion is formed with upstream ejection holes for ejecting air toward the one surface of the sheet.

[0049] Section 5: The inner circumferential surface of the hood has an opposing portion opposing the upstream portion, Item 5. The sheet conveying device according to item 4, wherein a guide roller is provided between the opposing portion of the inner peripheral surface of the hood and the upstream portion of the outer peripheral surface of the air turn bar.

[0050] Item 6: The sheet conveying device according to any one of items 1 to 4, wherein the suction holes are formed in an area of ​​the inner circumferential surface of the hood that faces at least the folded end of the outer circumferential surface of the air turn bar. [Explanation of symbols]

[0051] A Seat A1 Uncoated surface A2 Coated surface 10. Sheet transport device 11 First conveying section 12 First fold 13 Second conveying section 14 Second fold 15 Third conveyor section 20 Air Turn Bar 20a interior space 21 Base 21a Air inlet 21b Air supply device 22 Protrusion 22a: A section formed in a semicircular cross section (semicircular section) 22b Upstream part 22c downstream 22d Folded end 23 Side part 25 Spout hole 26 Upstream outlet 27 Rectifier plate 30 Food 30a interior space 31 Inner surface 31a,31c parts 31b Opposite part 32 Hose flange 32a Air suction device 33 Side wall 35 Suction hole 40,41 Free roller 50 Drying Nozzle 60 Guide roller

Claims

1. an air turn bar that turns back a strip-shaped sheet conveyed along a predetermined conveyance path; a hood having an inner peripheral surface facing the outer peripheral surface of the air turn bar; Equipped with The outer peripheral surface of the air turn bar is formed with an ejection hole for ejecting air toward one surface of the sheet, The inner peripheral surface of the hood is formed with suction holes for sucking air from the other surface of the sheet. Sheet transport device.

2. 2. The sheet conveying device according to claim 1, further comprising a plurality of guide rollers arranged along the outer peripheral surface of the air turn bar and the inner peripheral surface of the hood.

3. The outer peripheral surface of the air turn bar has a portion formed in a semicircular cross section, 3. The sheet transporting device according to claim 1, wherein the air turn bar turns the sheet being transported in the opposite direction.

4. the outer peripheral surface of the air turn bar has an upstream portion extending from the part formed in the semicircular cross section to the upstream side in the conveyance direction of the sheet, 4. The sheet conveying device according to claim 3, wherein the upstream portion is formed with upstream nozzle holes for blowing air toward the one surface of the sheet.

5. The inner circumferential surface of the hood has an opposing portion opposing the upstream portion, 5. The sheet conveying device according to claim 4, wherein a guide roller is provided between the opposing portion of the inner peripheral surface of the hood and the upstream portion of the outer peripheral surface of the air turn bar.

6. 3. The sheet conveying device according to claim 1, wherein the suction holes are formed in at least a region of the inner peripheral surface of the hood that faces a folded end of the outer peripheral surface of the air turn bar.

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