JP2005219871A - Non-contact conveyance device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a non-contact conveyance device capable of suppressing noise due to vibration of a web at low cost. <P>SOLUTION: Two flowing-out limiting plates 25 are rectangular plate members having substantially same length as length in the direction of width of a conveyance plate 35 of a turn bar 23 and are attached to a plane part 35b in such a manner that they become substantially parallel with a roller 24a and the plane part 35b. An upper end of the flowing-out limiting plate 25 approaches a curved face part 35a and the roller 24a and is arranged between the roller 24a and the turn bar 23. An interval between the web 11 lapping on the roller 25a and the turn bar 23 is reduced by the flowing-out limiting plate 25. For this reason, since flowing-out of air injected through an injection port into the direction of conveyance of the web 11 is limited and the air flows out in the direction of width of the web 11, vibration of the web 11 due to blowing-out air in the direction of conveyance of the web 11 is suppressed to reduce noise. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a non-contact conveying apparatus that non-contact conveys a strip-shaped material (web) in a stable floating state.

  In a photosensitive printing plate (PS plate) production line, a web of aluminum or the like is conveyed by a roller. At this time, the web surface (photosensitive layer application surface) is easily damaged due to contact between the web and the roller, slip, or the like, and quality failure is likely to occur. In order to prevent such quality failure, it is necessary to carry out contactless conveyance without bringing the web surface and the roller surface into contact with each other. As such a non-contact conveyance method, a method of floating and conveying a web by injecting air from the conveyance surface of a turn bar is considered. However, when floating and transporting using such a turn bar, the air pressure decreases near the entrance / exit of the turn bar, and there is a possibility that the web surface and the transport surface of the turn bar come into contact with each other due to web vibration. For this reason, it has been difficult to stably contactlessly convey the web while keeping the flying height uniform.

  In order to solve the above-mentioned problem, excessive air is blown out in the vicinity of the entrance / exit of the turn bar to prevent a decrease in air pressure near the entrance / exit, to make the flying height of the web uniform, and to the transfer surface of the turn bar by the vibration of the web A method for preventing contact is known (see, for example, Patent Documents 1 and 2). There is also known a method of providing a lead-out portion that guides air in the width direction of the web at the entrance / exit of the turn bar to prevent air from escaping in the web conveyance direction and reducing the air pressure in the vicinity of the entrance / exit (for example, a patent) Reference 3).

  However, the turn bars described in Patent Documents 1 and 2 have a problem in that the structure of the turn bar is complicated and the cost is increased in addition to the extra air amount required for flying. In addition, the levitation device described in Patent Document 3 has a problem in that the manufacturing cost is high because it is necessary to change the structure of the turn bar because the lead-out portion that guides air in the width direction of the web is provided. In order to solve such a problem, a roller that rotates in contact with the surface opposite to the air bearing surface of the web is arranged so as to be close to both ends of the jetting surface of the turn bar with respect to the web conveyance direction and substantially parallel to the turn bar. The non-contact transfer device has been filed by the present applicant (see Patent Document 4). According to this non-contact conveyance device, it is possible to reduce the vibration of the web at a low cost without changing the structure of the turn bar, and to prevent the web from being in contact with the conveyance surface of the turn bar by making the web floating amount uniform. it can.

Japanese Utility Model Publication No. 5-28632 Japanese Utility Model Publication No. 6-6341 Japanese Patent Laid-Open No. 9-295727 Japanese Patent Application No. 2003-38559

  However, the non-contact conveyance device described in Patent Document 4 is insufficient to prevent leakage of air in the web conveyance direction, and the web vibrates due to the blowing air in the web conveyance direction and generates noise. was there. In addition, there is a problem that air leakage in the vicinity of the entrance / exit of the turn bar decreases due to air leakage in the web conveyance direction, resulting in uneven web flying height.

  The present invention has been made in view of the above circumstances, and a low-cost non-contact conveyance device that keeps the flying height uniform, reduces web vibration, and suppresses noise without complicating the structure of the turn bar. The purpose is to provide.

  In order to solve the above-mentioned problem, the non-contact conveyance device of the present invention includes a turn bar for injecting gas from a plurality of injection ports provided on an injection surface having a substantially arc-shaped cross section to float a web from the injection surface, A non-contact conveyance device for non-contact conveyance of a web, wherein the pressure roller is disposed so as to be close to both ends of the ejection surface with respect to the web conveyance direction and substantially parallel to the turn bar, and rotates while pressing the floated web And is attached to the turn bar between the press roller and the turn bar, has a length substantially the same as the length of the ejection surface in the width direction, and gas flows out from the ejection surface in the web conveyance direction. A non-contact conveying device comprising an outflow restricting member for restricting the flow rate.

  Further, it is preferable that the outflow restricting member is movably attached in the web conveying direction to adjust the interval between the presser roller and the outflow restricting member.

  According to the non-contact conveyance device of the present invention, since the outflow restriction member having a length substantially the same as the width of the injection surface of the turn bar is attached between the press roller and the turn bar, the gas injected from the injection surface is Outflow in the web conveyance direction is restricted, and outflow in the width direction of the web. For this reason, when the web is floated and conveyed, the vibration of the web due to the blowing air in the web conveyance direction can be reduced, and the noise caused by the vibration of the web can be suppressed. Moreover, the fall of the gas pressure of the both ends with respect to the web conveyance direction of an injection surface is prevented, and the uniform floating amount of a web is securable.

The outflow restriction plate is attached to the turn bar so as to be movable in the web conveyance direction, and the distance between the press roller and the outflow restriction member is adjusted. For this reason, the vibration of the web is minimized while preventing contact with the web by attaching the web that wraps to the presser roller and the outflow restricting plate at an optimal distance based on the web thickness and web rigidity. Can be limited.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a process for producing a PS plate embodying the present invention. The PS plate manufacturing process 10 includes a surface treatment device 13, a water washing device 14, first and second coating devices 15 and 16, and first and second drying devices 17 and 18. The aluminum web 11 is fed from a web roll 19 as a supply source by a web feeder 20 and sent to the surface treatment device 13 by a plurality of conveying rollers 21. In the surface treatment device 13, a surface treatment for improving the coating property and adhesion of the photosensitive compound applied to the surface of the web 11 is performed. The web 11 that has been subjected to the surface treatment is washed by a water washing device 14, and further a photosensitive coating solution is applied by a first coating device 15.

  The web 11 coated by the first coating device 15 is sent to the first drying device 17 and the coating surface is dried, but the web 11 is transported from the first drying device 17 to the second coating device 16. The non-contact conveyance device 22 is used. The non-contact conveying device 22 includes a turn bar 23 and four rollers 24a and 24b, and the web 11 is conveyed by the turn bar 23 without contacting the web 11 without contact. Thereby, even after drying, the coating surface having high adhesion is subjected to a drying process without contacting the member or the like until reaching the second coating device 16. The web 11 coated with the coating liquid for the protective layer by the second coating device 16 and then dried by the second drying device 18 is transported by a plurality of transport rollers 25 and then by the web winder 26. It is wound around the core 27. However, the present invention does not depend on the embodiment shown in FIG.

  Next, the structure of the non-contact conveyance apparatus 22 is demonstrated using FIGS. FIG. 2 is an external perspective view showing the configuration of the contactless conveyance device 22, and FIG. 3 is an external perspective view showing the configuration of the turn bar 23. FIG. 4 is a schematic side view of the contactless conveyance device 22. The non-contact conveying device 22 includes a turn bar 23, four rollers 24a and 24b, and two outflow restricting plates 25 that are outflow restricting members.

  The turn bar 23 includes a transport plate 35 having a front surface, a back surface, and an upper surface and a substantially U-shaped cross section, and two side plates 36 and 37 that form side surfaces and cover both ends of the transport plate 35. And a bottom plate 38 that forms the lower surface and covers the lower end of the transport plate 35, and the inside of the turn bar 23 is hollow. Further, the transport plate 35 constitutes a transport surface for transporting the web 11.

  The transport plate 35 includes a curved surface portion 35a that is curved in an arc shape and flat surface portions 35b that extend from both ends of the curved surface portion 35a in the web transport direction. The curved surface portion 35a is an ejection surface that injects air to float and convey the web 11, and on the entire surface of the curved surface portion 35a, ejection ports 39 having the same size are formed in a staggered pattern at a predetermined pitch in the vertical and horizontal directions. ing. In the present embodiment, the pitch of the injection ports 39 is 10.0 mm in length and 10.5 mm in width. However, the present invention does not depend on the shape or pitch of the injection ports 39, and the injection ports 39 in the figure exaggerate the size, pitch, etc. of the injection ports 39 in order to avoid the complexity of the drawing. It expresses. In addition, the aperture ratio of the curved surface part 35a which is an ejection surface is set to about 0.6%.

  The side plates 36 and 37 are provided with air ducts 40a and 40b for supplying air into the turn bar 23, respectively. Air is supplied into the turn bar 23 through air ducts 40a and 40b by a blower such as a blower (not shown). For this reason, since the internal pressure of the turn bar 23 rises and becomes higher than the external pressure, air is injected from the injection port 39. Thus, the web 11 is floated by the air jetted from the jetting port 39 and is conveyed without contact by the turn bar 23. Note that the gas injected from the turn bar 23 may be another gas, such as nitrogen, instead of air.

  Further, the two rollers 24a are pressing rollers, and are disposed substantially parallel to the turn bar 23 so as to be close to both end portions of the curved surface portion 35a that is the ejection surface. The two rollers 24 a rotate in contact with the surface opposite to the air bearing surface of the web 11. Thereby, the fluttering by the large vibration of the web 11 at both ends of the curved surface portion 35a is prevented, so that the contact between the surface of the web 11 and the conveying surface of the turn bar 23 can be prevented.

  The other two rollers 24 b are located below the turn bar 23 and are arranged on the conveyance path of the web 11. The two rollers 24 b are arranged so as to be parallel to the turn bar 23 and symmetrical to the turn bar 23. The interval between these rollers 24b is wider than the interval between the two rollers 24a.

  The outflow restricting plate 25 is a rectangular plate member having substantially the same length as the length of the turn bar 23 in the longitudinal direction (width direction of the transport plate 35), and is substantially parallel to the roller 24a and the flat portion 35b. It is attached to the flat part 35b. The outflow restricting plate 25 is disposed so that the upper end is close to the curved surface portion 35a and the roller 24a. For this reason, the upper end of the outflow restriction plate 25 is disposed between the roller 24a and the turn bar 23, and restricts the air injected from the injection surface from flowing out in the web conveyance direction.

  Further, as shown in FIG. 5, the outflow restricting plate 25 is formed with three long holes 41a, 41b, and 41c for attaching to the flat portion 35b. The long holes 41a, 41b, and 41c are long holes for countersunk bolts and are provided at both ends and the center in the longitudinal direction. The flat bolts 42 are inserted into the long holes 41a, 41b, and 41c, and are attached by screwing into the screw holes 43a, 43b, and 43c formed in the flat portion 35b of the turn bar 23. Thus, since the outflow restricting plate 25 is attached by the countersunk bolt 42, the head of the bolt does not protrude from the surface of the outflow restricting plate 25 as shown in FIG. Can be prevented.

  Further, since the outflow restricting plate 25 is attached by being inserted into the long holes 41a, 41b, 41c, the outflow restricting plate 25 is in a direction (vertical direction) substantially parallel to the conveying direction of the web 11, as shown in FIG. The distance between the roller 24a and the outflow restricting plate 25 can be adjusted. For this reason, by moving the outflow restricting plate 25 in the vertical direction based on the thickness and rigidity of the web 11, the position at which the floating surface of the web 11 wrapped on the roll 24 a and the outflow restricting plate 25 have the optimum distance d <b> 1. Can be adjusted to. In addition, although it demonstrated that the three elongate holes were formed in the outflow restriction | limiting board 25, it is not restricted to this, What is necessary is just two or more.

  By this outflow restricting plate 25, the space between the air bearing surface of the web 11 wrapped on the roller 24a and the turn bar 23 is narrowed, and the air ejected from the ejection port 39 is restricted from flowing out in the conveying direction of the web 11. As shown in FIG. 2, the air is restricted to flow out in the width direction of the web 11. For this reason, the vibration of the web 11 due to the blowing air in the conveyance direction of the web 11 is suppressed, and the noise generated by the vibration of the web 11 can be reduced.

  As shown in FIGS. 5 and 6, the outflow restriction plate 25 is composed of different materials on the front end side and the rear end side. The curved surface portion 35a (conveying surface) and the proximity portion 50 on the tip side adjacent to the roller 24a are made of various fluororesins such as PTFE (Polytetrafluoroethylene) in consideration of the possibility of emergency contact. Is formed. This PTFE is effective because it has a very low coefficient of friction and is not easily wrinkled even if the web 11 contacts the proximity portion 50. Further, the corner of the proximity portion 50 close to the web 11 is chamfered with a 1 mm square (C1). Thereby, even when the outflow restriction plate 25 comes into contact with the air bearing surface of the web 11 in an emergency, it is possible to further prevent the surface from being wrinkled. The corner of the proximity portion 50 has been described as being chamfered to about C1, but is not limited thereto, and may be a curved surface of R1.

  The rear end portion of the proximity portion 50, that is, the attachment portion 51 in which the three long holes 41 a, 41 b, 41 c are formed, is bent by SUS (stainless steel) material or the like in order to ensure manufacturing accuracy and attachment accuracy. There are few materials.

  Next, the operation of the non-contact transport apparatus having the above configuration will be described. In an actual PS plate, the web 11 has a maximum thickness of 0.5 and a web width of about 400 mm to 1500 mm. When the web 11 is bonded with a tape, the web 11 is overlapped and bonded with a double-sided tape, and an aluminum vapor-deposited tape is applied to the outer peripheral portion for reinforcement. Therefore, the thickness of the bonded portion is about 2.0 mm.

Moreover, the tension | tensile_strength at the time of conveying a web is set to about 100 kg-160 kg. Further, a turbo blower with an air volume of 50 mm ³ / min is used as the air blowing means, air is supplied into the turn bar 23 through the air ducts 40a and 40b, and the flying height d2 of the web 11 is set to about 4.0 mm.

  In this case, by moving the attachment position of the outflow restricting plate 25 in the vertical direction, the distance d1 between the air bearing surface of the web 11 wrapped on the roll 24a and the outflow restricting plate 25 is adjusted to be 2.7 mm to 2.8 mm. Set to. Thereby, the vibration of the web 11 can be minimized while preventing contact with the web 11. In addition, it is possible to prevent uneven application of the web surface caused by web vibration.

  The web 11 conveyed by the non-contact conveying device 22 is conveyed along a conveying path formed by the rollers 24 a, the rollers 24 b, and the turn bar 23. At this time, since the roller 24a rotates in contact with the surface opposite to the air bearing surface of the web 11, large vibrations of the web 11 at both ends (the inlet side and the outlet side of the web 11) of the turn bar 23 in the web conveying direction are suppressed. Thus, fluttering is prevented. For this reason, it is prevented that the web 11 contacts the conveyance surface of the turn bar 23.

  Further, the air jetted from the curved surface portion 35a (jetting surface) is inhibited from flowing out in the conveyance direction of the web 11 by the outflow restricting plate 25 that restricts the outflow direction of the air, and as shown in FIG. It flows out in the width direction. For this reason, a decrease in air pressure at both ends of the curved surface portion 35a (jetting surface) is prevented, and the flying height of the web 11 can be kept uniform on the transport plate 35, and vibration of the web can be suppressed. . When the outflow restricting plate 25 is not attached, blowing air is generated in the conveyance direction of the web 11 and the web 11 vibrates, thereby generating a noise of about 85 db. However, when the outflow restriction plate 25 is attached, the vibration of the web 11 can be suppressed, so that the noise value can be suppressed to about 70 db.

  In the present embodiment, the non-contact conveyance device has been described as including a single turn bar. However, the present invention is not limited to this and may be configured as including a plurality of turn bars. In this case, as described above, a roller and a blocking plate may be provided for each turn bar.

  Moreover, in this embodiment, the non-contact conveying apparatus 22 of this invention was arrange | positioned between the 1st coating device 15 and the 2nd coating device 16, and it demonstrated so that the web 11 might be conveyed non-contactingly. However, the present invention is not limited to this, and the present invention may be applied to web conveyance in various apparatuses such as other drying apparatuses and coating apparatuses.

  Further, in the present embodiment, the case where the PS plate is conveyed in a contactless manner has been described. However, the present invention is not limited to this. For example, a photographic film substrate, a photographic paper baryta paper, and a magnetic recording medium substrate. It can be applied to a continuous belt-like shape having flexibility.

  In this embodiment, as a prevention of rubbing when the web and the outflow restriction plate are in contact with each other, the outflow restriction plate is made of a PTFE material. However, any material having a heat resistance of about 50 to 60 ° C. may be used. An acetal resin such as Delrin (registered trademark) or a material such as vinyl chloride may be used.

It is the schematic which shows a PS plate manufacturing process. It is an external appearance perspective view which shows the structure of a non-contact conveying apparatus. It is an external appearance perspective view which shows the structure of a turn bar. It is a side view which shows the structure of a non-contact conveying apparatus. It is a top view which shows the structure of an outflow restriction board. It is sectional drawing which shows the structure of an outflow restriction board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 PS plate manufacturing process 11 Web 22 Non-contact conveyance apparatus 23 Turn bar 24a, 24b Roller 25 Outflow restricting plate 35 Conveyance plate 35a Curved part 35b Plane part 39 Injection port d1 space | interval d2 Flying height

Claims (2)

In the non-contact conveyance apparatus which comprises a turn bar which injects gas from a plurality of injection ports provided on an injection surface having a substantially arc shape in cross section and floats the web from the injection surface, and non-contact conveyance of the web, the web of the injection surface A presser roller that is disposed close to both ends with respect to the transport direction and is substantially parallel to the turn bar, and that rotates by pressing the floated web;
Attached to the turn bar between the presser roller and the turn bar, has a length substantially the same as the width in the width direction of the spray surface, and restricts the outflow of gas from the spray surface toward the web conveyance direction A non-contact transfer device comprising an outflow restricting member.   The non-contact conveyance device according to claim 1, wherein the outflow restriction member is movably attached in a web conveyance direction to adjust a distance between the pressing roller and the outflow restriction member.

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