Dust removal device and dust removal method

Abstract

A dust removal device is provided that can normally remove dust from the surface of a sheet having an edge portion with convex pieces arranged continuously at certain intervals along the longitudinal direction. The dust removal device sprays gas from a spray port onto the surface of the sheet (100) and sucks the gas on the surface of the sheet (100) through a suction port, wherein the dust removal device is configured such that the spray port includes: a first spray port (30) that sprays gas onto a portion of the sheet (100) other than the edge portion; and a second spray port (35) that sprays gas onto the edge portion (100b) of the sheet (100); and the suction port includes: first suction ports (31, 32) that suck the gas on the surface of the portion other than the edge portion (100b) of the sheet (100); and second suction ports (33, 34) that suck the gas on the surface of the edge portion (100b) of the sheet (100).

Description

Technical Field

[0001] The present invention relates to a dust removal device and a dust removal method for removing dust on the surface of a conveyed sheet by spraying gas onto the surface of the sheet and sucking the gas on the surface of the sheet. Background Art

[0002] In the past, a dust removal device described in Patent Document 1 was known. The dust removal device is arranged opposite to the portion of the sheet that abuts against the guide roller (support portion), and the sheet is wound around the guide roller and conveyed by the rotation of the guide roller. A slit-shaped nozzle and a suction port (opening of an air suction box) extending in a direction perpendicular to the conveying direction of the sheet (the width direction of the sheet) are formed in the dust removal device at a predetermined interval so that the nozzle is located upstream of the suction port in the conveying direction. Moreover, while the sheet is being conveyed, the dust removal device sprays air from the nozzle toward the surface of the sheet and sucks the air on the surface of the sheet through the suction port. The dust attached to the surface of the sheet is separated from its surface by the air ejected from the nozzle and floats, and the floating dust is sucked from the suction port together with the air. Thus, the dust attached to the surface of the sheet is removed (dust removal).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 5-138136 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] However, for example, when manufacturing secondary batteries (lithium ion batteries, etc.), Figure 1 The electrode thin film (for example, aluminum thin film, copper thin film) of the sheet 100 shown in FIG. In the sheet 100, the sheet body 100a is formed in the width direction ( Figure 1 The edge portion 100b that is continuous in the transverse direction has a shape in which a plurality of tongues 101 (projecting pieces) that protrude in the width direction are continuously arranged in the longitudinal direction at predetermined intervals. From such a sheet 100, two types of single-electrode thin film sheets 110a and 110b are cut out for each tongue 101. Figure 2 As shown in FIG. 1 , these single electrode films 110a and 110b are alternately stacked in predetermined numbers with insulating films 111 interposed therebetween. Figure 3 As shown, the final stacked body is formed into a battery cell 200 having two electrode blocks 210 a and 210 b formed by stacking the tabs 101 .

[0008] In the process of manufacturing the battery cell 200 described above, it is necessary to remove dust from the surface of the sheet 100 (electrode film) used as the material. Therefore, it is conceivable to remove dust from the sheet 100 using the above-mentioned conventional dust removal device.

[0009] However, when using the aforementioned conventional dust removal device to remove dust from a sheet 100 having the aforementioned structure, the edge portion 100b of the sheet 100, where the tongue 101 is arranged, does not experience tension associated with conveyance. Therefore, the edge portion 100b may be shaken or bent by the flow of gas ejected from the ejection port or drawn through the air intake port, or may be drawn into the air intake port. As a result, proper dust removal cannot be performed on the surface of the edge portion 100b of the sheet 100.

[0010] The present invention has been made in view of such circumstances, and provides a dust removing device capable of normally removing dust from the surface of a sheet-like object having an edge portion in which fins are continuously arranged at certain intervals in the longitudinal direction.

[0011] Means for solving problems

[0012] The dust removal device of the present invention is constructed to include a nozzle and a suction port which are opposite to the surface of the sheet being conveyed and arranged at prescribed intervals along the conveying direction of the sheet. The dust removal device sprays gas from the nozzle toward the surface of the sheet and sucks the gas on the surface of the sheet through the suction port, wherein the nozzle includes: a first nozzle which sprays gas toward a portion other than an edge portion in the width direction of the sheet; and a second nozzle which sprays gas toward the edge portion of the sheet, and the suction port includes: a first suction port which sucks the gas on the surface of a portion other than the edge portion of the sheet; and a second suction port which sucks the gas on the surface of the edge portion of the sheet.

[0013] According to this structure, while a sheet is being conveyed, gas ejected from the first nozzle is blown toward portions of the sheet other than the edge, while gas ejected from the second nozzle is blown toward the edge. At this time, gas on the surface of portions of the sheet other than the edge is sucked through the first suction port, while gas on the surface of the edge is sucked through the second suction port. In this way, gas ejected from different nozzles is blown toward the edge and other portions of the sheet, and gas on the surface of the edge and other portions of the sheet are sucked through different suction ports. This allows gas to be blown toward the edge of the sheet at a different intensity than that of other portions, suited to the shape of the edge, and gas to be sucked from the surface of the edge of the sheet at a different intensity than that of other portions, suited to the shape of the edge.

[0014] In the dust removing device of the present invention, a supply path of the gas ejected from the first ejection port and a supply path of the gas ejected from the second ejection port may be different from each other.

[0015] According to this structure, gas supplied from different supply paths is ejected from the first and second ejection ports, thereby blowing gas toward the edge portion of the sheet and other portions thereof, respectively. Thus, gas can be easily blown toward the edge portion of the sheet with a strength different from that of other portions, and with a strength suitable for the shape of the edge portion.

[0016] In the dust removing device of the present invention, the opening area per unit length of the second blowing port may be smaller than the opening area per unit length of the first blowing port.

[0017] According to such a configuration, while the sheet-like object is being conveyed, gas of a weaker intensity than that of other portions can be blown toward the edge portion of the sheet-like object.

[0018] In the dust removing device of the present invention, the second ejection port may include a plurality of small holes arranged in a direction transverse to a conveyance direction of the sheet-like object.

[0019] According to such a configuration, the gas can be ejected weaker from the second ejection port than in the case of extending in a slit shape.

[0020] The dust removing device of the present invention may be configured to include a gas ejection path having a shape gradually widening from an opening facing the conveyed sheet-like object to the second ejection port.

[0021] According to such a structure, the gas is ejected from the opening through the gradually expanding gas ejection path from the second ejection port. The ejection pressure of the gas ejected from the peripheral portion of the second ejection port along the inner peripheral wall of the gas ejection path is lower than the ejection pressure of the gas ejected directly from the portion of the second ejection port opposite to the opening without following the inner peripheral wall of the gas ejection path. Thus, the ejection pressure of the gas ejected from the portion of the second ejection port opposite to the opening can be maintained at a desired pressure, and the ejection pressure of the gas ejected from the peripheral portion of the second ejection port can be reduced. Since the ejection pressure of the gas ejected from the peripheral portion of the second ejection port is reduced, it is difficult for a negative pressure state caused by the Bernoulli effect to be generated in the opposite region of the peripheral portion of the second ejection port. In this way, the edge of the conveyed sheet material can be prevented from rolling up due to the negative pressure state that may be generated by the Bernoulli effect when it enters the opposite area of ​​the peripheral portion of the second nozzle, and the dust attached to the edge of the conveyed sheet material can be reliably removed by using the gas of the desired ejection pressure ejected from the portion of the second nozzle opposite to the opening.

[0022] In the dust removal device of the present invention, the gas ejection path may have a cross section perpendicular to the sheet-like object being conveyed that has a shape that gradually expands in an arc shape.

[0023] With this structure, gas is ejected from the opening along the gradually expanding inner circumferential wall of the gas ejection path, which has a circular arc cross-section, from the peripheral portion of the second ejection port. Simultaneously, gas is ejected directly from the portion of the second ejection port that faces the opening. As described above, the ejection pressure of the gas ejected from the portion of the second ejection port that faces the opening can be maintained at a desired pressure, while the ejection pressure of the gas ejected from the peripheral portion of the second ejection port can be reduced.

[0024] In the dust removal device of the present invention, it can be constructed so that the second nozzle includes a plurality of slits arranged in a direction transverse to the conveying direction of the sheet-like object and extending in a direction transverse to the arrangement direction respectively. The dust removal device also has a gas ejection path respectively arranged relative to the plurality of slits and extending from the opening opposite to the sheet-like object to the slit, and the cross-section of the gas ejection path perpendicular to the slit has a shape that gradually expands from the opening to the slit.

[0025] According to this structure, gas is ejected from the openings through the gradually expanding gas ejection paths and out of the multiple slits. The ejection pressure of the gas ejected from the openings along the inner circumferential wall of the gas ejection path and from the upstream end of the slit in the conveying direction of the sheet-like material is lower than the ejection pressure of the gas ejected directly from the portion of the slit opposite the opening, not along the inner circumferential wall of the gas ejection path. As a result, the ejection pressure of the gas ejected from the portion of each slit opposite the opening can be maintained at a desired pressure, and the ejection pressure of the gas ejected from the upstream end of each slit can be reduced. Since the ejection pressure of the gas ejected from the upstream end of each slit is reduced, a negative pressure state caused by the Bernoulli effect is less likely to occur in the area opposite the upstream end of each slit. In this way, the edge of the sheet material can be prevented from rolling up due to the negative pressure state that may be caused by the Bernoulli effect when it enters the opposite area of ​​the upstream end of each slit, and the dust attached to the edge of the conveyed sheet material can be reliably removed by using the gas with the desired ejection pressure ejected from the part of each slit opposite to the opening.

[0026] Furthermore, when the edge of a conveyed sheet enters the area facing the upstream ends of the plurality of slits, air at a predetermined pressure is discretely blown toward the edge of the sheet from each of the plurality of slits. Therefore, when the edge of the sheet enters the area facing the upstream ends of the plurality of slits in the conveying direction, the entire beginning of the edge is not simultaneously acted upon by the air. Thus, while air at a desired pressure is being ejected from the portion of the slit facing the opening, the air acting upon the edge of the sheet can reliably prevent the edge from curling up.

[0027] In the dust removing device of the present invention, the cross-sectional shape may be a shape that gradually expands in an arc shape.

[0028] With this structure, gas is ejected from the openings along the gradually expanding inner circumferential wall of the gas ejection path, which has a circular arc cross-section, from the upstream end of each slit in the conveying direction of the sheet material being conveyed. Simultaneously, gas is ejected directly from the portion of each slit opposite the opening, not along the inner circumferential wall of the gas ejection path. As described above, this maintains the desired ejection pressure of the gas ejected from the portion of each slit opposite the opening, while reducing the ejection pressure of the gas ejected from the upstream end of each slit.

[0029] In the dust removing device of the present invention, each of the plurality of slits may be formed to be inclined obliquely with respect to a conveyance direction of the sheet-like object.

[0030] According to this configuration, during the conveyance of the sheet, the gas can be blown from the plurality of discretely arranged slits to a wider area of ​​the edge portion of the sheet, rather than blowing the gas only to the plurality of strip-shaped areas.

[0031] In the dust removing device of the present invention, each of the plurality of slits may be formed so as to overlap with an adjacent slit when viewed in the conveyance direction of the sheet-like object.

[0032] According to such a configuration, gas can be blown toward the edge portion of the sheet-like object without any gaps from the plurality of discretely arranged slits during the conveyance of the sheet-like object.

[0033] In the dust removing device of the present invention, the plurality of slits may be arranged in parallel, or may be arranged in a zigzag pattern in a direction transverse to the conveying direction of the sheet-like object.

[0034] In the dust removing device of the present invention, the opening area per unit length of the second suction port may be smaller than the opening area per unit length of the first suction port.

[0035] According to such a configuration, while the sheet is being conveyed, gas can be sucked weaker from the surface of the edge portion of the sheet than from the surface of other portions.

[0036] In the dust removal device of the present invention, the second suction port may include a plurality of small holes arranged in a direction transverse to a conveyance direction of the sheet-like object.

[0037] According to such a configuration, gas can be sucked weaker through the second suction port compared to a case where the second suction port extends in a slit shape or a case where the second suction port extends in an elongated rectangular shape.

[0038] In the dust removal method of the present invention, the dust removal method is performed to remove dust from a sheet-like object, the sheet having an edge portion in a shape in which convex portions are continuously arranged at certain intervals along a longitudinal direction, wherein the dust removal method is constructed as follows: the dust removal method uses a dust removal device, the dust removal device has a nozzle and a suction port arranged opposite to the surface of the conveyed sheet and extending in a direction transverse to the conveying direction at prescribed intervals in the conveying direction of the sheet, the dust removal method includes the following airflow generating process: gas is ejected from the nozzle toward the surface of the sheet and the gas on the surface of the sheet is sucked through the suction port, in the airflow generating process, the ejection of gas from the nozzle is weaker than the ejection performed toward the portion other than the edge portion of the sheet, and the suction of gas through the suction port is weaker than the suction performed from the surface of the portion other than the edge portion of the sheet.

[0039] According to this configuration, while a sheet is being conveyed, air is blown toward the edge of the sheet, which is arranged continuously at intervals along the conveying direction, at a weaker pressure than the rest of the sheet. Simultaneously, air is sucked from the surface of the edge at a weaker pressure than the rest of the sheet, thereby removing dust from the surface of the sheet. This prevents the individual fins from being bent or damaged by the blown and sucked air during dust removal.

[0040] Effects of the Invention

[0041] According to the dust removal device of the present invention, when blowing gas onto the surface of a conveyed sheet and simultaneously sucking gas from the surface, thereby removing dust from the surface of the sheet, gas can be blown onto the edge portion of the sheet at a strength different from that of other portions and suitable for the shape of the edge portion, and gas can be sucked from the surface of the edge portion of the sheet at a strength different from that of other portions and suitable for the shape of the edge portion. Therefore, when a sheet having an edge portion with fins arranged continuously at regular intervals along its length is conveyed along its length while dust is removed from the surface of the sheet, it is possible to prevent the fins of the edge portion from being bent or damaged by gas ejected from the ejection port and gas sucked through the suction port, thereby properly removing dust from the surface of the sheet having an edge portion with fins arranged continuously at regular intervals along its length.

[0042] According to the dust removal device and dust removal method of the present invention, while conveying a sheet-like object having an edge portion with fins arranged continuously at regular intervals along the length direction, dust is removed from the surface of the sheet-like object. A gas having a weaker force than that of the remaining portions of the sheet-like object is blown toward the edge portion of the sheet-like object, while simultaneously sucking gas from the surface of the edge portion at a weaker force than that of the remaining portions. This prevents the fins from being bent or damaged by the blown and sucked gas during dust removal, thereby enabling proper dust removal from the surface of the sheet-like object having an edge portion with fins arranged continuously at regular intervals along the length direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a diagram showing an electrode film as an example of a sheet-like object to be dust-removed.

[0044] Figure 2 It is shown from Figure 1 The diagram shows the stacked state of single electrode film sheets cut out of the electrode film.

[0045] Figure 3 It shows that Figure 2 A diagram of a battery cell formed by stacking multiple single-electrode thin film sheets as shown.

[0046] Figure 4 It is a perspective view showing the dust removing device according to the first embodiment of the present invention.

[0047] Figure 5 It is a side view showing the dust removing device according to the first embodiment of the present invention.

[0048] Figure 6 It is a plan view showing the dust removing device according to the first embodiment of the present invention.

[0049] Figure 7 This is a front view showing the dust removing device according to the first embodiment of the present invention.

[0050] Figure 8 This is an exploded perspective view (Part 1) showing the structure of the dust removing device according to the first embodiment of the present invention.

[0051] Figure 9 This is an exploded perspective view (part 2) showing the structure of the dust removing device according to the first embodiment of the present invention.

[0052] Figure 10 It is a bottom view showing the dust removing device according to the first embodiment of the present invention.

[0053] Figure 11 The dust removal device is shown along Figure 6 、 Figure 7 and Figure 10 A cross-sectional view of the section taken along line AA.

[0054] Figure 12 The dust removal device is shown along Figure 6 、 Figure 7 and Figure 10 A cross-sectional view of the cross section along line BB.

[0055] Figure 13 This is an enlarged view showing the relative positional relationship between the sheet-like objects to be removed and the discharge port and suction port of the dust removal device.

[0056] Figure 14 It is a side view showing a dust removing device according to a second embodiment of the present invention.

[0057] Figure 15 It is a bottom view showing a dust removing device according to a second embodiment of the present invention.

[0058] Figure 16 This is a diagram illustrating the principle of how a flap (tab) is rolled up by air ejected from a nozzle.

[0059] Figure 17 It is a bottom view showing a dust removing device according to a third embodiment of the present invention.

[0060] Figure 18 It is a partially cutaway bottom view showing a part of the dust removing device according to the third embodiment of the present invention in an enlarged manner.

[0061] Figure 19 The dust removal device is shown along Figure 18 A cross-sectional view of the section taken along line AA.

[0062] Figure 20 This is a cross-sectional view showing an enlarged view of the gas ejection path reaching the second ejection port (slit).

[0063] Figure 21 It is a line graph showing the discharge pressure of the air discharged from the second discharge port (slit).

[0064] Figure 22 It is a bottom view showing a modification of the dust removing device according to the third embodiment.

[0065] Figure 23 It is a bottom view showing another modified example of the dust removing device according to the third embodiment.

[0066] Figure 24 It is a diagram showing a modified example of the second discharge port. DETAILED DESCRIPTION

[0067] Hereinafter, embodiments of the present invention will be described using the drawings.

[0068] The dust removal device of the first embodiment of the present invention is as follows Figures 4 to 13 In addition, Figure 4 is a perspective view showing the dust removal device, Figure 5 is a side view showing the dust removal device, Figure 6 is a top view showing the dust removal device, Figure 7 1 is a front view showing the dust removal device. Figure 8 and Figure 9 They are exploded perspective views showing the structure of the dust removal device, Figure 10 1 is a bottom view showing the dust removal device. Figure 11 The dust removal device is shown along Figure 6 、 Figure 7 and Figure 10 The cross-sectional view of the section along line AA, Figure 12 The dust removal device is shown along Figure 6 、 Figure 7 and Figure 10 A cross-sectional view of the cross section along line BB. Figure 13This is an enlarged view showing the relative positional relationship between the sheet-like objects to be removed and the discharge port and suction port of the dust removal device.

[0069] exist Figure 4 and Figure 5 In the embodiment, the sheet 100 to be dust-removed is wound around the conveying roller 15 as a support portion and is conveyed in a state of tension applied thereto in the longitudinal direction (conveying direction Dcv) by the rotation of the conveying roller 15. Figures 1 to 3 ) is an electrode film used in the manufacture of secondary batteries. The edge portion 100b, which extends from the sheet body 100a in the width direction, has a plurality of tabs 101 (tabs) arranged continuously in the longitudinal direction at predetermined intervals. Furthermore, no tension is applied to the tabs 101 (edge ​​portion 100b) of the sheet 10 as it is conveyed by the conveyor roller 15.

[0070] The dust removal device 10 is arranged to face the surface of the sheet 100 wound around the conveying roller 15 (see Figure 4 and Figure 5 ). Moreover, if Figure 4 and Figure 5 as well as Figure 6 and Figure 7 As shown, the dust removal device 10 has a direction along the rotation axis of the conveying roller 15 (the width direction of the sheet 100, the direction perpendicular to the conveying direction Dcv of the sheet 100, Figure 6 and Figure 7 The exhaust duct unit 13 is an exhaust duct unit 13, which is an elongated block-shaped dust removal head 11 extending in the respective horizontal directions, and an exhaust duct unit 13 extending along the upper surface of the dust removal head 11. The bottom of the exhaust duct unit 13 is open, and a flange 13a is formed on the edge of the opening. The flange 13a of the exhaust duct unit 13 is fixed to the upper surface of the dust removal head 11 by a plurality of bolts, so that the dust removal unit 11 and the exhaust duct unit 13 become one, thereby forming a space serving as an exhaust path inside the exhaust duct unit 13. An exhaust port 14 is provided on the side of the exhaust duct unit 13. The exhaust port 14 is connected to a suction mechanism (for example, a vacuum pump: not shown in the figure), and by the action of the suction mechanism, the air passing through the exhaust path of the exhaust duct unit 13 is discharged to the outside through the exhaust port 14.

[0071] An air supply port 12 is provided on the side of the dust removal head 11. The air supply port 12 is connected to an air supply mechanism (e.g., a pressure pump; not shown) that supplies pressurized air. The operation of the air supply mechanism causes pressurized air to be introduced into the dust removal head 11 (the air injection chamber 20 described later) through the air supply port 12. Furthermore, the dust removal head 11 is provided with an air supply pipe 16 inserted from its side. The air supply pipe 16 is also connected to an external air supply mechanism (not shown) and is used to introduce pressurized air into the dust removal head 11. The air supply mechanism connected to the air supply port 12 and the air supply mechanism connected to the air supply pipe 16 may be the same or different. A guide plate 17 (sheet pressing mechanism) is fixed to the surface of the dust removal head 11 that faces the conveyor roller 15. The guide plate 17 (sheet pressing mechanism) presses the edge portion 100b of the sheet 100, where the tongue 101 is formed, toward the conveyor roller 15 (support portion) and guides the sheet 100 along the conveyor roller 15.

[0072] like Figures 4 to 7 as well as Figure 8 and Figure 9 As shown, the dust removal head 11 has a structure in which the head block 11a and the suction adjustment plate 11b overlap. The head block 11a includes an air injection chamber 20, a front first air suction chamber 21, a rear first air suction chamber 22, a front second air suction chamber 23, and a rear second air suction chamber 24, as spaces opening at the interface with the suction adjustment plate 11b. The air injection chamber 20 extends longitudinally at the center of the width of the head block 11a. The front first air suction chamber 21 and the front second air suction chamber 23, which extend longitudinally of the head block 11a, are arranged along the front edge of the head block 11a (corresponding to the upstream side in the conveying direction Dcv of the sheet 100). The rear first air suction chamber 22 and the rear second air suction chamber 24 extending in the longitudinal direction of the head block 11a are arranged side by side along the rear edge of the head block 11a (corresponding to the downstream side in the conveying direction Dcv of the sheet 100). The front second air suction chamber 23 and the rear second air suction chamber 24 are shorter than the front first air suction chamber 21 and the rear first air suction chamber 22, respectively. The length of the front second air suction chamber 23 and the rear second air suction chamber 24 is the same as the edge portion 100b of the sheet 100 to be dust-removed, where the tongue 101 is formed (see FIG. 1 ). Figure 1 ) is approximately the same width as the front first air suction chamber 21 and the rear first air suction chamber 22. The lengths of the respective front first air suction chambers 21 and the rear first air suction chambers 22 are approximately the same width as the sheet body 100a of the sheet object 100 (see Figure 1 ) roughly corresponds to the width of

[0073] The suction adjustment plate 11b is formed with a first front suction adjustment hole 25 and a first rear suction adjustment hole 26, each consisting of a plurality of elongated holes, and a second front suction adjustment hole 27 and a second rear suction adjustment hole 28, each consisting of a plurality of small holes. Furthermore, the total opening area of ​​the second front suction adjustment hole 27 and the second rear suction adjustment hole 28 is smaller than the total opening area of ​​the first front suction adjustment hole 25 and the first rear suction adjustment hole 26. The head block 11a and the suction adjustment plate 11b are fixed to the exhaust duct unit 13 (flange 13a) in an overlapping state using a plurality of bolts. When the head block 11a and the suction adjustment plate 11b overlap, the front first air suction chamber 21 of the head block 11a faces the front first suction adjustment hole 25 of the suction adjustment plate 11b, and the front second air suction chamber 23 of the head block 11a faces the front second suction adjustment hole 27 of the suction adjustment plate 11b. Furthermore, the rear first air suction chamber 22 of the head block 11a faces the rear first suction adjustment hole 26 of the suction adjustment plate 11b, and the rear second air suction chamber 24 of the head block 11a faces the rear second suction adjustment hole 28 of the suction adjustment plate 11b. Furthermore, when the head block 11a and the suction adjustment plate 11b overlap, the air injection chamber 20 of the head block 11a is sealed by the suction adjustment plate 11b.

[0074] like Figures 4 to 9 as well as Figure 10 As shown, the surface of the dust removal head 11 (head block 11a) facing the conveyor roller 15 is formed with a slit-shaped first ejection port 30 extending longitudinally in the center of its width. Furthermore, this surface is formed with a slender rectangular first front suction port 31 along its front edge, and a slender rectangular first rear suction port 32 along its rear edge. When the sheet 100 is being conveyed by the conveyor roller 15, the first ejection port 30, the first front suction port 31, and the first rear suction port 32, arranged at predetermined intervals along the conveyance direction Dcv, face the sheet body 100a of the sheet 100 in the dust removal device 10.

[0075] Moreover, if Figure 11As shown, the first ejection port 30 communicates with the air ejection chamber 20 formed in the head block 11a, so that pressurized air introduced into the air ejection chamber 20 (the air supply path) from the air supply port 12 is ejected from the first ejection port 30. Furthermore, the front first suction port 31 communicates with the space (exhaust path) within the exhaust duct unit 13 via the front first air suction chamber 21 formed in the head block 11a and the front first suction adjustment hole 25 formed in the suction adjustment plate 11b. Furthermore, the rear first suction port 32 communicates with the space within the exhaust duct unit 13 via the rear first suction chamber 22 formed in the head block 11a and the rear first suction adjustment hole 26 formed in the suction adjustment plate 11b. As air passes through the exhaust path (space) of the exhaust duct unit 13 and is discharged to the outside through the exhaust port 14, the air is drawn in through the front first suction port 31 and the rear first suction port 32, which communicate with the space within the exhaust duct unit 13.

[0076] Back to Figure 10 The guide plate 17 fixed to the surface of the dust removal head 11 (head block 11a) opposite to the conveying roller 15 is formed with a front second suction port 33 in a manner arranged along the length direction with the front first suction port 31. The front second suction port 33 is composed of a plurality of small holes arranged in a straight line, and the total opening area per unit length of the front second suction port 33 is smaller than the opening area per unit length of the front first suction port 31. Moreover, the guide plate 17 is formed with a rear second suction port 34 in a manner arranged along the length direction with the rear first suction port 32. The rear second suction port 34 is the same as the front second suction port 33, and is composed of a plurality of small holes arranged in a straight line, and the total opening area per unit length of the rear second suction port 34 is smaller than the opening area per unit length of the rear first suction port 32.

[0077] Moreover, if Figure 12 As shown, the front second suction port 33 formed in the guide plate 17 communicates with the space (exhaust path) within the exhaust duct unit 13 via the front second air suction chamber 23 formed in the head block 11a and the front second suction adjustment hole 27 formed in the suction adjustment plate 11b. Furthermore, the rear second suction port 34 formed in the guide plate 17 communicates with the space within the exhaust duct unit 13 via the rear second air suction chamber 24 formed in the head block 11a and the rear second suction adjustment hole 28 formed in the suction adjustment plate 11b. As air passing through the space (exhaust path) of the exhaust duct unit 13 is discharged to the outside through the exhaust port 14, air is drawn in through the front second suction port 33 and the rear second suction port 34, which communicate with the space within the exhaust duct unit 13.

[0078] like Figure 10 and Figure 12As shown, the air supply pipe 16 is inserted into the head block 11a of the dust removal head 11, and the closed end of the air supply pipe 16 reaches near the edge of the guide plate 17. In the guide plate 17, a second ejection port 35 is formed at a predetermined position between the front second suction port 33 and the rear second suction port 34, near the front second suction port 33, parallel to the front second suction port 33 and the rear second suction port 34. The second ejection port 35 is composed of a plurality of small holes arranged in a straight line, and the total opening area per unit length of the second ejection port 35 is smaller than the opening area per unit length of the first ejection port 30. Furthermore, the second ejection port 35 formed in the guide plate 17 communicates with the air supply pipe 16 inserted into the head block 11a, so that pressurized air introduced into the air supply pipe 16 (another air supply path) is ejected from the second ejection port 35.

[0079] The dust removal device 10 having the above-described configuration removes dust from the sheet object 100 as follows.

[0080] The sheet 100 is conveyed with a certain tension applied to the sheet main body 100a by the rotation of the conveying roller 15. When the sheet 100 conveyed in this way passes through the dust removal device 10, as shown in FIG. Figure 4 and Figure 5 as well as Figure 13 As shown, the edge portion 100 b of the sheet 100 where the tongues 101 are continuously arranged is guided by the guide plate 17 so as to follow the conveying roller 15 , and moves while being pressed toward the conveying roller 15 .

[0081] In the dust removal device 10, due to the difference in opening area per unit length between the first nozzle 30 and the second nozzle 35, and also due to the difference in shape between the air injection chamber 20 serving as the air supply path to the first nozzle 30 and the air supply pipe 16 serving as the air supply path to the second nozzle 35, the intensity of the air ejection from the second nozzle 35 is less than the intensity of the air ejection from the first nozzle 30. Moreover, due to the difference in opening area per unit length of the front side first suction port 31 and the rear side first suction port 32, and the difference in opening area per unit length of the front side second suction port 33 and the rear side second suction port 34, and also, due to the difference in opening area per unit length of the front side first suction adjustment hole 25 and the rear side first suction adjustment hole 26 of the suction adjustment plate 11b, and the difference in opening area per unit length of the front side second suction adjustment hole 27 and the rear side second suction adjustment hole 28, the intensity of air suction through the front side second suction port 33 and the rear side second suction port 34 is less than the intensity of air suction through the front side first suction port 31 and the rear side first suction port 32.

[0082] As the sheet 100 moves, air is strongly ejected from the first ejection port 30 of the dust removal device 10 toward the surface of the sheet 100, primarily the sheet body 100a. Furthermore, the air on the surface of the sheet body 100a is strongly sucked through the front first suction port 31 and the rear first suction port 32 (airflow generation process). The air from the first ejection port 30 draws dust, primarily from the surface of the sheet body 100a, along with the air, through the front first suction port 31 and the rear first suction port 32. Consequently, dust is removed from the surface of the sheet 100a, primarily the sheet body 100a.

[0083] In addition, if Figure 13 As shown, as the sheet 100 moves, the edge 100b of the sheet 100, which is pressed toward the conveyor roller 15 by the guide plate 17 and guided along the conveyor roller 15, moves while facing the front second suction port 33, the second ejection port 35, and the rear second suction port 34. During this process, air, weakly ejected from the second ejection port 35, is blown toward the surface of the edge 100b of the sheet 100, and the air on the surface of the edge 100b of the sheet 100 is weakly sucked through the front second suction port 33 and the rear second suction port 34 (airflow generation process). The air from the second ejection port 35 sucks dust floating from the surface of each tongue 101 (edge ​​100b) of the sheet 100 pressed by the guide plate 17 together with the air through the front second suction port 33 and the rear second suction port 34. Thus, the tongues 101 of the sheet 100 (edge ​​portion 100 b ) can remove dust from the surface thereof without being shaken, bent, or drawn into the suction ports 33 , 34 .

[0084] According to the dust removal device 10 described above, dust can be reliably removed from the sheet object 100, primarily the sheet body 100a, by utilizing the strong air ejection from the first ejection port 30 and the strong air suction through the front first suction port 31 and the rear first suction port 32. Meanwhile, unlike the sheet body 100a, the edge portion 100b of the sheet object 100 is subjected to air ejection and suction at intensities appropriate to the configuration of the edge portion 100b (the configuration in which the tongues 101 (projecting tabs) are arranged). Specifically, air is ejected more weakly from the second ejection port 35 and air is suctioned more weakly through the front second suction port 33 and the rear second suction port 34. This prevents the tongues 101 at the edge portion 100b of the sheet object 100 from dangling, bending, or being drawn into the suction port. Furthermore, as the sheet 100 is conveyed, the edge portion 100b of the tongue 101 is guided along the conveyor roller 15 by the guide plate 17 and pressed toward the conveyor roller 15. This further reliably prevents the tongue 101 at the edge portion 100b from swaying, bending, or being drawn into the suction port. The optimized air ejection and suction, combined with the pressure of the guide plate 17 against the conveyor roller 15, ensure reliable and regular dust removal from the edge portion 100b of the sheet 100.

[0085] In the dust removal device 10 of the first embodiment, two suction ports (the front first suction port 31 and the rear first suction port 32) are provided across the first discharge port 30. However, the present invention is not limited thereto, and only one of the suction ports may be provided. In this case, any corresponding one of the front second suction port 33 and the rear second suction port 34 may be provided.

[0086] In addition, the shapes of the second nozzle 35, the front second suction port 33, and the rear second suction port 34 are not limited to the above-mentioned shapes. For example, the shapes of the second nozzle 35, the front second suction port 33, and the rear second suction port 34 may be shapes that are arranged non-parallel. In addition, the shapes of the second nozzle 35, the front second suction port 33, and the rear second suction port 34 may be shapes that are composed of a single hole or a plurality of small holes arranged in a randomly dispersed manner.

[0087] In the first embodiment described above, the guide plate 17 is provided, but the guide plate 17 may be omitted. In this case, for example, the dust removing device is configured as in the second embodiment described below.

[0088] The dust removal device of the second embodiment of the present invention is as follows Figure 14 and Figure 15 The dust removal device of the second embodiment is similar to the dust removal device of the first embodiment (see Figures 4 to 13) is that the guide plate 17 is omitted, the second nozzle 35 consisting of a plurality of small holes arranged in a straight line is directly formed on the air supply pipe 16, and the surface of the air supply pipe 16 on which the second nozzle 35 is formed is exposed from the surface of the head block 11a of the dust removal head 11 opposite to the conveying roller 15.

[0089] In this dust removal device, as in the first embodiment, dust can be reliably removed from the sheet object 100, primarily the sheet body 100a, by strong air ejection from the first ejection port 30 and strong air suction through the front first suction port 31 and the rear first suction port 32. Meanwhile, unlike the sheet body 100a, the edge portion 100b of the sheet object 100 is ejected and sucked with air of a strength appropriate to the shape of the edge portion 100b (the shape in which the tongues 101 (projecting tabs) are arranged). Specifically, weak air ejection is performed from the second ejection port 35 formed in the portion of the air supply pipe 16 that is exposed from the surface of the head block 11a, and weak air suction is performed through the front second suction port 33 and the rear second suction port 34 formed on the surface of the head block 11a. Thus, the edge portion 100 b of the sheet 100 can be properly dusted without the tongue 101 of the edge portion 100 b of the sheet 100 being shaken, bent, or drawn into the suction port.

[0090] Furthermore, the air supply pipe 16 can be rotated with its extension direction as the axis while inserted into the head block 11a. Rotating the air supply pipe 16 allows the direction of air ejected from the second suction port 35 to be adjusted. This adjustment allows air to be blown from the appropriate direction toward the edge portion 100b (the continuous tongue 101) of the sheet 100 during normal dust removal.

[0091] However, if Figure 16 As shown, due to the high-speed flow of air ejected from the ejection port O (opening) of the dust removal device 10 (refer to Figure 16 (As indicated by the thick arrow in the figure), the static pressure in the area along which the air flows decreases, potentially generating a negative pressure BA (Bernoulli effect). If negative pressure BA is generated in the area along which the ejected air flows, when the tongue 101 at the edge 100b of the sheet 100 being conveyed by the conveyor roller 15 enters the area opposite the ejection port O, the negative pressure BA causes the tip of the tongue 101 to float. Even if the tip of the tongue 101 is slightly lifted, the ejected air enters the gap between them, causing the tongue 101 to suddenly roll upward. As a result, proper dust removal from the edge 100b (the tongue 101) of the sheet 100 becomes impossible.

[0092] The dust removal device according to the third embodiment of the present invention is designed in view of such circumstances and is designed to prevent the tongue 101 (edge ​​portion 100b) of the sheet 100 being conveyed from rolling up due to the negative pressure state caused by the Bernoulli effect.

[0093] The dust removal device 10 according to the third embodiment of the present invention is as follows Figures 17 to 19 As shown. Figure 17 is a bottom view showing the dust removal device, Figure 18 This is a partially cutaway bottom view showing a partially enlarged portion of the dust removal device. Figure 19 The dust removal device is shown along Figure 18 The dust removal device of the third embodiment is similar to the dust removal device of the first embodiment (see Figures 4 to 13 ) is that the second nozzle 40 is composed of a plurality of slits 40a, and the supply structure of the high-pressure air of the second nozzle 40 to the plurality of slits 40a and the fixing structure of the guide plate 17 to the dust removal head 11 of the dust removal device of the third embodiment are different from those of the dust removal device of the first embodiment.

[0094] exist Figure 17 and Figure 18 In the embodiment, the surface of the dust removal head 11 (head block 11a) facing the conveying roller 15 (sheet 100 (protruding tongue 101)) is the same as the dust removal device 10 of the first embodiment (see Figure 10 and Figure 15 ) are formed with a first ejection port 30, a front first suction port 31, and a rear first suction port 32 extending in the longitudinal direction. The dust removal head 11 (head block 11a) is provided with a first air supply port 12a and a second air supply port 12b. The high-pressure air introduced into the dust removal head 11 (head block 11a) through the first air supply port 12a is the same as that of the dust removal device 10 of the first embodiment (see Figure 11 ) is ejected from the first ejection port 30. Also, similarly to the dust removal device 10 of the first embodiment, the air accompanying the exhaust duct unit 13 is discharged to the outside through the exhaust port 14, and the air is sucked in through the front first suction port 31 and the rear first suction port 32, respectively.

[0095] In the dust removal device 10 of the third embodiment, in particular, the second nozzle 40 composed of a plurality of slits 40a is formed on the surface of the dust removal head 11 (head block 11a) opposite to the conveying roller 15 in such a manner as to be arranged along the direction in which the first nozzle 30 extends. The plurality of slits 40a constituting the second nozzle 40 are arranged at prescribed intervals along the longitudinal direction of the dust removal head 11, which is the direction of the conveying direction Dcv across the sheet 100 (the direction perpendicular to the conveying direction Dcv). Moreover, the plurality of slits 40a extend respectively along the direction across the direction in which they are arranged (the width direction of the sheet 100, i.e., the longitudinal direction of the dust removal head 11), and are inclined obliquely with respect to the conveying direction Dcv of the sheet 100. Moreover, from the second air supply port 12b, as in Figure 18 As shown in the enlarged view, the air supply path 41 extends within the dust removal head 11 (head block 11a) toward the plurality of slits 40a of the second ejection port 40. Furthermore, high-pressure air introduced from the second air supply port 12b is ejected from the plurality of slits 40a of the second ejection port 40 through the air supply path 41 (details of which will be described later).

[0096] In addition, if Figure 17 and Figure 18 as well as Figure 19 As shown, the guide plate 17 is fixed to the dust removal head 11 via a fixing block 18. The guide plate 17 presses the tongue 101 (edge ​​portion 100b) of the sheet 100 conveyed by the rotating conveyor roller 15 toward the conveyor roller 15 and guides it along the conveyor roller 15.

[0097] like Figure 19 As shown, the front second suction port 33, which is composed of a plurality of small holes, communicates with the exhaust duct unit 13 through the front second air suction chamber 23 and the front suction adjustment hole 27 of the dust removal head 11. Furthermore, the rear second suction port 34, which is composed of a plurality of small holes, communicates with the exhaust duct unit 13 through the rear second air suction chamber 24 and the rear suction adjustment hole 28 of the dust removal head 11. As a result, air accompanying the exhaust duct unit 13 is discharged to the outside through the exhaust port 14, with the air being sucked in through the front second suction port 33 and the rear second suction port 34, respectively.

[0098] In addition, the plurality of slits 40a constituting the second ejection port 40 are respectively communicated with the air supply path 41. Figure 20 As shown, the connecting path 42a extending from the gas supply path 41 is connected to the gas ejection path 42b reaching the slit 40a through the opening 43. The cross section of the gas ejection path 42b perpendicular to the slit 40a ( Figure 20 Along the shown Figure 18 The cross section along the line AA) is a shape that gradually expands from the opening 43 to the slit 40a, specifically, a shape that gradually expands in an arc shape.

[0099] In the dust removal device 10 of the third embodiment described above, as in the first embodiment, dust can be reliably removed from the sheet object 100, primarily the sheet body 100a, by the air strongly ejected from the first ejection port 30 and the strong suction of air through the front first suction port 31 and the rear first suction port 32. Meanwhile, dust is removed from the edge portion 100b (the tongue 101) of the sheet object 100 by the air ejected from the plurality of slits 40a of the second ejection port 40 and the suction of air through the front second suction port 33 and the rear second suction port 34.

[0100] Here, dust removal of the edge portion 100 b (the tongue 101 ) of the sheet 100 will be described in more detail.

[0101] like Figure 20 As shown, high-pressure air from the air supply path 41 through the connecting path 42a is ejected from the opening 43 through the gradually expanding gas ejection path 42b from the slit 40a. The ejection pressure of the air ejected from the slit 40a is as follows: Figure 21 The air is distributed as shown. Specifically, the ejection pressure Pe1 of the air ejected from the opening 43 along the inner circumferential wall of the gas ejection path 42b and from the upstream end of the slit 40a in the conveying direction Dcv of the sheet object 100 (the tongue 101) being conveyed is lower than the ejection pressure Pc of the air ejected directly from the portion of the slit 40a facing the opening 43, without following the inner circumferential wall of the gas ejection path 42b. Consequently, the air pressure Pc ejected from the portion of the slit 40a facing the opening 43 is maintained at a desired pressure (lower than the ejection pressure from the first ejection port 30), while the ejection pressure Pe1 of the air ejected from the upstream end of the slit 40a is reduced.

[0102] By lowering the ejection pressure Pe1 of the air ejected from the upstream end of the slit 40a, the Bernoulli effect makes it less likely that a negative pressure state will be generated in the area Eb facing the upstream end of the slit 40a. This prevents the tongue 101 of the conveyed sheet 100 from being rolled up due to the negative pressure state that could be generated by the Bernoulli effect when entering the area Eb facing the upstream end of the slit 40a. Furthermore, dust adhering to the tongue 101 can be reliably removed by the air ejected at the desired ejection pressure Pc from the portion of the slit 40a facing the opening 43.

[0103] The ejection pressure Pe2 of the air ejected from the downstream end of the slit 40a (see Figure 21 ) is also lowered, so that the tongue 101 of the conveyed sheet 100 can be released from the opposing area of ​​the downstream end of the slit 40a in a stable state without shaking.

[0104] Furthermore, in the dust removal device 10, when the tongue 101 of the conveyed sheet 100 enters the area Eb facing the upstream ends of the plurality of slits 40a, air at a predetermined ejection pressure Pe1 is discretely blown onto the tongue 101 from each of the plurality of slits 40a. Therefore, when the tongue 101 of the sheet 100 enters the area Eb facing the upstream ends of the plurality of slits 40a, the ejected air does not simultaneously act on the entire leading edge of the tongue 101. This reliably prevents the tongue 101 from rolling up due to the air acting on the leading edge of the tongue 101 while air at the desired ejection pressure Pc is being ejected from the portion of the slit 40a facing the opening 43.

[0105] Furthermore, the multiple slits 40a constituting the second ejection port 40 are inclined obliquely relative to the conveying direction Dcv of the sheet 100 (the tongue 101). Therefore, when the tongue 101 of the sheet 100 passes through the opposing area of ​​each slit 40a, gas can be blown from the discretely arranged multiple slits 40a to a wider range of the tongue 101.

[0106] In addition, the arrangement of the plurality of slits 40a constituting the second ejection port 40 is not limited to the above arrangement (see Figure 17 、 Figure 18 ). For example, Figure 22 As shown, the plurality of slits 40 a may be arranged in a zigzag pattern in the width direction of the conveyed sheet 100 (the tongue 101 ), that is, in a direction transverse to (perpendicular to) the conveying direction of the sheet 100 .

[0107] In addition, if Figure 23 As shown, the multiple slits 40a constituting the second discharge port 40 can be formed so that each adjacent slit 40a overlaps when viewed along the conveyance direction Dcv of the sheet 100 (the tongue 101). In this case, gas can be blown seamlessly from the discretely arranged slits 40a toward the sheet 100 (the tongue 101) while the sheet 100 is being conveyed. As a result, dust can be more reliably removed from the surface of the sheet 100 (the tongue 101).

[0108] Furthermore, the structure (shape) of the second ejection port 40 is not limited to the plurality of slits 40a as described above. Figure 24 As shown, the second ejection port can be formed as an elongated hole 45 extending in a direction transverse to (e.g., perpendicular to) the conveying direction Dcv of the sheet 100 (the tongue 101), that is, in the width direction of the dust removal head 11. Moreover, in the dust removal head 11, a connecting path 46a extending from the air supply path 41 is connected to a gas ejection path 46b reaching the elongated hole 45 through an opening 47. The cross section of the gas ejection path 46b perpendicular to the elongated hole 45 (at Figure 24 Indicated by dotted lines) and the aforementioned structure (refer to Figure 20) Similarly, it becomes a shape that gradually expands from the opening 47 to the elongated hole 45, specifically, it becomes a shape that gradually expands in the shape of a circular arc.

[0109] In the dust removal device 10 in which the second ejection port is formed by the elongated hole 45, as in the aforementioned configuration, the ejection pressure of the air ejected from the opening 47 along the inner peripheral wall of the gas ejection path 46b from the upstream end EG1 of the elongated hole 45 in the conveying direction Dcv of the sheet 100 (the tongue 101) being conveyed is lower than the ejection pressure of the air ejected directly from the portion of the elongated hole 45 opposing the opening 47, without being ejected along the inner peripheral wall of the gas ejection path 46b. This maintains the desired pressure (lower than the ejection pressure from the first ejection port 30) of the air ejected from the upstream end EG1 of the elongated hole 45.

[0110] This reduces the ejection pressure of the gas ejected from the upstream end EG1 of the elongated hole 45 (second ejection outlet). As described above, this reduces the likelihood of a negative pressure state due to the Bernoulli effect occurring in the area Eb facing the upstream end EG1 of the elongated hole 45. This prevents the tongue 101 of the conveyed sheet 100 from being rolled up due to the negative pressure state that could otherwise be generated by the Bernoulli effect when entering the area Eb facing the upstream end EG1 of the elongated hole 45. Furthermore, dust adhering to the tongue of the conveyed sheet 100 can be reliably removed by the gas ejected at the desired ejection pressure from the portion of the elongated hole 45 (second ejection outlet) facing the opening 47. Furthermore, the ejection pressure of the air ejected from the downstream end EG2 of the elongated hole 45 is similarly reduced, allowing the tongue 101 of the conveyed sheet 100 to be released from the area facing the downstream end EG2 of the elongated hole 45 in a stable and stable manner without shaking.

[0111] Furthermore, in the second ejection port, Figure 24 When the second ejection port 40 is composed of a plurality of slits 40a (see Figures 17 to 20 ), when the tongue 101 of the conveyed sheet 100 enters the area Eb facing the upstream end EG1 of the elongated hole 45, the air ejected from the elongated hole 45 simultaneously acts on the entire starting portion of the tongue 101. Therefore, considering this situation, it is necessary to adjust the ejection pressure of the air ejected from the elongated hole 45 (the ejection pressure of the gas from the opening 47).

[0112] Furthermore, the support portion for supporting the sheet 100 is not limited to the conveying rollers 15 and 55. As long as it is a member that contacts the conveyed sheet 100, it may be a flat member or a member with a curved surface other than a cylindrical curved surface, such as the conveying rollers 15 and 55. Furthermore, the dust removal device 10 does not need to be a member disposed opposite the support portion for supporting the sheet 100, but may be a member disposed opposite a surface portion of the sheet 100 that is not specifically supported by the support portion.

[0113] The sheet-like objects to be removed from the dust may be sheets fed from a roller or may be individual sheets.

[0114] In addition, the sheet-like object to be removed can be any thin and wide component that can be affected by the airflow passing through the nozzle and the suction port. It is not limited to so-called sheet-like components, but can be a so-called film-like component such as the electrode film used in the manufacture of the aforementioned secondary battery, or a so-called membrane-like component.

[0115] While the embodiments of the present invention have been described above, these embodiments and variations of their respective parts are provided as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other ways and can be omitted, replaced, or modified without departing from the gist of the invention. These embodiments and their variations are included within the scope and gist of the invention and are included in the invention described in the claims.

[0116] Industrial applicability

[0117] The dust removal device and dust removal method of the present invention have the effect of normally removing dust from the surface of a sheet-like object having an edge portion with protruding pieces (protruding tongues) continuously arranged at certain intervals along the length direction. It is useful as a dust removal device and dust removal method that sprays gas onto the surface of a conveyed sheet and sucks the gas on the surface of the sheet to thereby remove dust from the surface of the sheet.

[0118] Description of labels

[0119] 10: Dust removal device; 11: Dust removal head; 11a: Head block; 11b: Suction adjustment plate; 12: Air supply port; 12a: 1st air supply port; 12b: 2nd air supply port; 13: Exhaust duct unit; 13a: Flange; 14: Exhaust port; 15: Conveyor roller; 16: Air supply pipe; 17: Guide plate; 18: Guide fixing block; 20: Air injection chamber; 21: 1st front air suction chamber; 22: 1st rear air suction chamber; 23: 2nd front air suction chamber; 24: 2nd rear air suction chamber; 25: 1st front suction adjustment hole; 26: 1st rear air suction chamber 1: Suction adjustment hole; 27: Second suction adjustment hole on the front side; 28: Second suction adjustment hole on the rear side; 30: First ejection port; 31: First suction port on the front side; 32: First suction port on the rear side; 33: Second suction port on the front side; 34: Second suction port on the rear side; 35: Second ejection port; 40: Second ejection port; 40a: Slit; 41: Air supply path; 42a, 46a: Connecting path; 42b, 46b: Gas ejection path; 43, 47: Opening; 45: Elongated hole; 100: Sheet; 100a: Sheet body; 100b: Edge portion; 101: Tongue (projecting piece portion).

Claims

1. A dust removal device for removing dust from a sheet-like object having an edge portion in which fins are continuously arranged at predetermined intervals in a longitudinal direction, the device comprising: a discharge port and a suction port disposed opposite to a surface of the sheet-like object being conveyed in the longitudinal direction and arranged at predetermined intervals in the conveying direction of the sheet-like object; The dust removal device ejects gas from the ejection port toward the surface of the sheet and sucks the gas on the surface of the sheet through the suction port. in, The ejection port comprises: a first ejection port configured to eject gas toward a portion of the sheet-like object other than the edge portion; and a second ejection port separated from the first ejection port and configured to eject gas toward the edge of the sheet-like object in a manner weaker than the ejection of gas from the first ejection port; The suction port comprises: a first suction port for sucking gas from a surface of the sheet-like object other than the edge portion; and The second suction port is separated from the first suction port and sucks the gas on the surface of the edge portion of the sheet-like object in a manner weaker than the suction of the gas from the first suction port.

2. The dust removal device according to claim 1, wherein: The supply path of the gas ejected from the first ejection port is different from the supply path of the gas ejected from the second ejection port.

3. The dust removal device according to claim 1 or 2, wherein: The opening area per unit length of the second discharge port is smaller than the opening area per unit length of the first discharge port.

4. The dust removal device according to claim 3, wherein: The second ejection port includes a plurality of small holes arranged in a direction transverse to a conveyance direction of the sheet.

5. The dust removal device according to claim 1 or 2, wherein: The dust removal device includes a gas ejection path having a shape gradually widening from an opening facing the sheet-like object being conveyed to the second ejection port. The dust removal device according to claim 5 , wherein: A cross section of the gas ejection path perpendicular to the sheet-like object being conveyed has an arc-like shape that gradually expands.

7. The dust removal device according to claim 1 or 2, wherein: The second ejection port includes a plurality of slits arranged in a direction transverse to the conveying direction of the sheet and extending in a direction transverse to the arrangement direction. The dust removal device further includes a gas ejection path which is respectively provided with respect to the plurality of slits and extends from an opening opposite to the sheet to the slits. A cross section of the gas ejection path perpendicular to the slit has a shape that gradually widens from the opening to the slit.

8. The dust removal device according to claim 7, wherein: The cross-section is in an arc shape that gradually expands.

9. The dust removal device according to claim 7, wherein: The plurality of slits are formed to be obliquely inclined relative to a conveying direction of the sheet.

10. The dust removal device according to claim 9, wherein: Each of the plurality of slits is formed so as to overlap with an adjacent slit when viewed in the conveyance direction of the sheet.

11. The dust removal device according to claim 7, wherein: The plurality of slits are arranged in parallel.

12. The dust removal device according to claim 7, wherein: The plurality of slits are arranged in a zigzag pattern in a direction transverse to a conveying direction of the sheet.

13. The dust removal device according to claim 1 or 2, wherein: An opening area per unit length of the second suction port is smaller than an opening area per unit length of the first suction port.

14. The dust removal device according to claim 13, wherein: The second suction port includes a plurality of small holes arranged in a direction transverse to a conveyance direction of the sheet.

15. A dust removal method for removing dust from a sheet-like object having an edge portion in which convex pieces are continuously arranged at intervals in a longitudinal direction, wherein: The dust removal method uses a dust removal device that is arranged to face the surface of a sheet being conveyed and includes a discharge port and a suction port that extend transversely to the conveying direction of the sheet at predetermined intervals. The dust removal method includes the following airflow generation step: ejecting gas from the ejection port toward the surface of the sheet object and sucking the gas on the surface of the sheet object through the suction port; In the airflow generating step, The gas ejected from the ejection port is weaker toward the edge of the sheet than toward portions other than the edge of the sheet. The gas suctioned through the suction port is weaker from the surface of the edge portion than from the surface of the portion other than the edge portion of the sheet.

16. The dust removal method according to claim 15, wherein: The dust removal method uses the dust removal device in which the ejection port includes a first ejection port and a second ejection port, and the suction port includes a first suction port and a second suction port. The first nozzle ejects gas toward the portion of the sheet-like object other than the edge portion. The second nozzle ejects gas toward the edge of the sheet. The first suction port sucks gas from the surface of the sheet-like object except for the edge portion. The second suction port sucks the gas on the surface of the edge portion of the sheet. In the airflow generating step, The gas ejected from the second ejection port is made weaker than the gas ejected from the first ejection port, and The suction of gas by the second suction port is made weaker than the suction of gas by the first suction port.

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