CA2145058C - Air foil wing extension for air turn - Google Patents
Air foil wing extension for air turn Download PDFInfo
- Publication number
- CA2145058C CA2145058C CA002145058A CA2145058A CA2145058C CA 2145058 C CA2145058 C CA 2145058C CA 002145058 A CA002145058 A CA 002145058A CA 2145058 A CA2145058 A CA 2145058A CA 2145058 C CA2145058 C CA 2145058C
- Authority
- CA
- Canada
- Prior art keywords
- air
- web
- arcuate surface
- support
- flat portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/10—Means using fluid made only for exhausting gaseous medium
- B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
- B65H2406/111—Means using fluid made only for exhausting gaseous medium producing fluidised bed for handling material along a curved path, e.g. fluidised turning bar
Landscapes
- Drying Of Solid Materials (AREA)
- Advancing Webs (AREA)
- Treatment Of Fiber Materials (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Actuator (AREA)
- Turning (AREA)
- Tumbler Switches (AREA)
- Toys (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
Abstract
Air turn for supporting and optionally drying a web, comprising an arcuate surface and two opposed, circumferentially spaced, transversely arranged air supply nozzle slots which supply pressurized air to the space between the web and the arcuate surface of the air turn. Air foil wing extensions are provided along the leading and/or trailing longitudinal edges of the air turn to reduce web flutter. Each wing extension includes a flat, non-perforated section and an angled perforated section.
Description
AIR FOIL WING EXTENSION FOR AN AIR TURN
FIELD OF THE INVENTION
The present invention relates to devices :for contactlessly drying and guiding traveling webs, and more particularly, an improved air flotation turning device which minimizes or eliminates web flutter and/or wrinkling.
BACKGROUND OF THE INVENTION
In web printing and drying operations, it is often desirable that the web be contactlessly supported in order to avoid damage to the web itself or to the coating (such as ink) previously applied to one or more surfaces of the web. One conventional arrangement for contactlessly supporting a web includes horizontal upper and lower sets of air bars between which the web travels. Hot air issuing from the air bara~ both dries and supports the web. Occasionally it becomes necessary to change the direction of web travel while maintaining the contactless environment . This can be accomplished using air' turns, which are devices that support a flexible web on a cushion of air pressure as the web travels around a curved path. Emir turns have a generally partially cylindrical surface through which pressurized a:ir is introduced through various slots, holes or apertures, or other designs or patterns. Typical air i~urns which are commercially available are a 95° turn, which carries the web around a 95° arc, and a 20° "shallow wrap" turn, which carries the web around an arc of 20°.
Such air turns replaced grater rollers . Grater rollers were a means to turn the web utilizing frictional contact with the web. As a result, web marking problems often arose. Although the use of air turns eliminated marking problems, the absence of the additional frictional restraint provided by the rollers led to web tracking problems, especially in the case of "baggy" or non-uniform webs. To compensate for tracking problems, the air turn was used as a steering device. By tilting one edge of the air turn in a direction perpendicular to and toward the web, a force was provided tending to push the web away from that side.
Conversely, if that end of the air turn were moved away from the web, the resulting air pressure forces pulled the web toward that end. Optical sensors are used to monitor web drift and send a signal to the steering drive motor controlling the position of the air turn. The drive motor moved the operator end of the air turn. Alternatively or additionally, the air turn could be tilted manually.
One example of an air turn is that disclosed in U.S. Patent No. 4,182,472.
Specifically, a guide for contactless support of a running web as the latter changes directions is provided. The guide is formed as a drum-like member having an arcuately curved surface which can be variable as to the length of its arc, depending on the degree of turn or change of direction desired for the running web. A series of parallel grooves extending in the direction of web travel are formed in the arcuate surface of the drum-like member. An air nozzle extends along the length of the drum-like member and at each end of the groves, and pressurized air is fed through the nozzles so as to form a pneumatic cushion between the web and the arcuate surface and thereby float the web. The grooves in the arcuate surface act as labyrinth seals in inhibiting the transverse air flow out of the cushion and towards the edges of the running web.
A further example of an air turn is provided in U.S. Patent No. 2,689,196, wherein a series of holes are formed in the cylindrical surface for the passage of pressurized air therethrough to support and guide a web passing over the drum.
Similarly, U.S. Patent No. 3,097,971 discloses a device having a series of slits in the curved supporting surface and which extend longitudinally and/or transversely to the web. Air under pressure is passed through these slits to form a cushion between the drum and the web.
An important aspect of any flotation system is the stability of the web as it passes over the air bar. Airflow instabilities near the web can induce web flutter and subsequent web contact with mechanical parts of the drying, resulting in coating or web damage. Web flutter can be manifested in a multitude of forms, ranging from a violent flapping of the web to a high frequency drumming.
Excessive web flutter has been encountered in conventional air turn applications. Where a plurality of air turns are used together so that the web follows a sinusoidal path, web flutter has been encountered as the web leaves the lower air turn and before it reaches the upper air turn.
It is therefore an object of the present invention to minimize or eliminate web flutter at the exit and/or entry point of an air turn.
FIELD OF THE INVENTION
The present invention relates to devices :for contactlessly drying and guiding traveling webs, and more particularly, an improved air flotation turning device which minimizes or eliminates web flutter and/or wrinkling.
BACKGROUND OF THE INVENTION
In web printing and drying operations, it is often desirable that the web be contactlessly supported in order to avoid damage to the web itself or to the coating (such as ink) previously applied to one or more surfaces of the web. One conventional arrangement for contactlessly supporting a web includes horizontal upper and lower sets of air bars between which the web travels. Hot air issuing from the air bara~ both dries and supports the web. Occasionally it becomes necessary to change the direction of web travel while maintaining the contactless environment . This can be accomplished using air' turns, which are devices that support a flexible web on a cushion of air pressure as the web travels around a curved path. Emir turns have a generally partially cylindrical surface through which pressurized a:ir is introduced through various slots, holes or apertures, or other designs or patterns. Typical air i~urns which are commercially available are a 95° turn, which carries the web around a 95° arc, and a 20° "shallow wrap" turn, which carries the web around an arc of 20°.
Such air turns replaced grater rollers . Grater rollers were a means to turn the web utilizing frictional contact with the web. As a result, web marking problems often arose. Although the use of air turns eliminated marking problems, the absence of the additional frictional restraint provided by the rollers led to web tracking problems, especially in the case of "baggy" or non-uniform webs. To compensate for tracking problems, the air turn was used as a steering device. By tilting one edge of the air turn in a direction perpendicular to and toward the web, a force was provided tending to push the web away from that side.
Conversely, if that end of the air turn were moved away from the web, the resulting air pressure forces pulled the web toward that end. Optical sensors are used to monitor web drift and send a signal to the steering drive motor controlling the position of the air turn. The drive motor moved the operator end of the air turn. Alternatively or additionally, the air turn could be tilted manually.
One example of an air turn is that disclosed in U.S. Patent No. 4,182,472.
Specifically, a guide for contactless support of a running web as the latter changes directions is provided. The guide is formed as a drum-like member having an arcuately curved surface which can be variable as to the length of its arc, depending on the degree of turn or change of direction desired for the running web. A series of parallel grooves extending in the direction of web travel are formed in the arcuate surface of the drum-like member. An air nozzle extends along the length of the drum-like member and at each end of the groves, and pressurized air is fed through the nozzles so as to form a pneumatic cushion between the web and the arcuate surface and thereby float the web. The grooves in the arcuate surface act as labyrinth seals in inhibiting the transverse air flow out of the cushion and towards the edges of the running web.
A further example of an air turn is provided in U.S. Patent No. 2,689,196, wherein a series of holes are formed in the cylindrical surface for the passage of pressurized air therethrough to support and guide a web passing over the drum.
Similarly, U.S. Patent No. 3,097,971 discloses a device having a series of slits in the curved supporting surface and which extend longitudinally and/or transversely to the web. Air under pressure is passed through these slits to form a cushion between the drum and the web.
An important aspect of any flotation system is the stability of the web as it passes over the air bar. Airflow instabilities near the web can induce web flutter and subsequent web contact with mechanical parts of the drying, resulting in coating or web damage. Web flutter can be manifested in a multitude of forms, ranging from a violent flapping of the web to a high frequency drumming.
Excessive web flutter has been encountered in conventional air turn applications. Where a plurality of air turns are used together so that the web follows a sinusoidal path, web flutter has been encountered as the web leaves the lower air turn and before it reaches the upper air turn.
It is therefore an object of the present invention to minimize or eliminate web flutter at the exit and/or entry point of an air turn.
SUMMARY OF THE INVENTION
The present invention provides in a contactless web support having an elongated arcuate surface and over which a running web is floatingly supported, said web support having a pair of elongated nozzles extending along the length of said arcuate surface, each of said nozzles having discharge slots configured to discharge pressurized air over said arcuate surface, said web support including means for supplying pressurized air to said nozzles, a first air foil wing extension fixed to the leading or trailing longitudinal edge of said air turn assembly, said first wing extension comprising a first flat portion extending away from said arcuate surface, and a second perforated section adjacent said first flat portion, such that pressurized air can escape through perforations in said perforated section.
The invention also provides in a contactless web support having an elongated arcuate surface and over which a running web is floatingly supported, said surface of said web support having a plurality of substantially parallel grooves forming labyrinth seals extending around said arcuate surface in a direction in which the web passes thereover, said web support having a pair of elongated nozzles extending along the length of said arcuate surface, each of said nozzles having discharge slots configured to discharge pressurized air over said arcuate surface, said web support including means for supplying pressurized air to said nozzles, a first air foil wing extensions fixed to the leading or trailing longitudinal edge of said air turn assembly, said first wing extension comprising a first flat portion extending away from said arcuate surface, and a second perforated section adjacent said first flat section.
The present invention provides in a contactless web support having an elongated arcuate surface and over which a running web is floatingly supported, said web support having a pair of elongated nozzles extending along the length of said arcuate surface, each of said nozzles having discharge slots configured to discharge pressurized air over said arcuate surface, said web support including means for supplying pressurized air to said nozzles, a first air foil wing extension fixed to the leading or trailing longitudinal edge of said air turn assembly, said first wing extension comprising a first flat portion extending away from said arcuate surface, and a second perforated section adjacent said first flat portion, such that pressurized air can escape through perforations in said perforated section.
The invention also provides in a contactless web support having an elongated arcuate surface and over which a running web is floatingly supported, said surface of said web support having a plurality of substantially parallel grooves forming labyrinth seals extending around said arcuate surface in a direction in which the web passes thereover, said web support having a pair of elongated nozzles extending along the length of said arcuate surface, each of said nozzles having discharge slots configured to discharge pressurized air over said arcuate surface, said web support including means for supplying pressurized air to said nozzles, a first air foil wing extensions fixed to the leading or trailing longitudinal edge of said air turn assembly, said first wing extension comprising a first flat portion extending away from said arcuate surface, and a second perforated section adjacent said first flat section.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a perspective view of a conventional air turn which can be used in accordance with the present invention;
Figure 2 is a cross-sectional view of a conventional air turn which can be used in accordance with the present invention;
Figure 3 is an isometric view of an air turn having air foil wing extensions in accordance with the present invention;
Figure 4 is a cross-sectional view of an air turn having air foil wing extensions showing the theoretical air flow pattern;
Figure 5 is a top view of an air foil wing in accordance with the present invention; and 4a ~~4~0~~
Figure 6 is a side view of the air foil wing of Figure 5.
DETAILED DESCRIPTION OF THE INVENTION
The web support provided by the present invention can support a moving web through various degrees of turning movement, but the present invention has been illustrated in Figure 1 as showing a web support for an approximate 90° l.urn, wherein the web W passes over and without contact with the support S. It should be understood that the following detaila_d description of the web support is for purposes of illustration and should not be construed as limiting of the present invention. The support S includes a member 1 formed generally with a 90° arcuate surface 2 which extends across the width of the web W to be supported and preferably beyond the edges of the web. Shaft means SM are provided at each side of the support so that t:he device can be suitably mounted in the drier apparatus. A series of substantially parallel or parallel grooves 3 optionally can be formed in the surface of the arcuate member 1 and extend in the direction of web travel as disclosed in the aforementioned U.S.
Patent No. 4,182,472. The grooves preferably are generally rectangular in cross-section, but may assume other configurations so long as the effect thereof is to create .a labyrinth seal whereby the flow of air out from the pressurized cushion is inhibited. The grooves 3 form circumferential ribs 4 and also define the upper surface 2 of arcuate surface. Alternatively, the arcuate surface can be smooth, although it :is preferred that labyrinth seals be formed therein.
Air nozzle N is located along each of the longitudinal ends of the support S and extend the full length thereof transversely across the width of the web being supported. The nozzles are generally U-shaped and have a sharp nozzle edge 6 (Figure 2) spaced a distance from the member 1 so as to define an elongated slot or nozzle 8 through which pressurized a.ir is discharged towards the web. The size of the nozzle opening can be adjusted by a series of screws 12 or the like threadab7Ly engaged in the frame F of the device and extending freely through the nozzle N.
The nozzle is secured to the support by any suitable means, such as screws or the like.
The sides of the support S include end plates 16 secured by cap screws to the ends of the arcuate member 1. The aforementioned shaft means SM are secured to the end plates such as by welding. The shaft means are adjustably mounted in the frame F of the apparatus so that the angular position of the support can be changed by rotating the support on the shafts.
The frame F has a series of holes 20 pas:~ing therethrough and through which pressurized air is fed from the chamber 24.
Chamber 24 is also defined by members 2 and 28 (which can be formed out of sheet metal) secured to a central duct 30 such as by welding. Pressurized air is supplied to the end of the duct 30 by a supply conduit 31 from a suitable air supply AS. The duct 30 has a longitudinal opening 32 which allows air to feed into chamber 24 and be discharged through the nozzle N and to each of the grooves in the arcuate surface.
A barrier 34 may be optionally provided extending transversely to the direction of the web travel and across the grooves 3. The barrier 34 blocks the grooves intermediate their length to form a barrier to the air flow in the grooves and eliminate flow instability and prevent one slot from dominating the other.
Turning now to Figure 3, air foil wing sections 60, 61 are shown, preferably fabricated from stainless steE~l. Each includes a flat, non-perforated portion 63 closest to the air supply slot of the air turn. The discharge air coming from the supply slot increases in velocity as it moves across the flat portions 63 of the wing, which is arranged with respect to the air turn so as to be parallel and in close proximity to the web. To that end, each air foil wing extension can be secured to the air turn by any suitable means, such as by screws attached to the frame of t:he device through brackets 65, 65'. The increased air velocity creates a pressure drop between the flat portions 63 and the web, which tends to draw the web towards the flat portions 63. A
large reduction of web flutter, in the range of 80o to 1000, has been demonstrated. Although wings preferably are used at both the web entry and web exit ends of the web support, if web flutter occurs at only one end in a particular application, only one wing could be used at that end.
The air foil wing extensions also each inc:Lude a perforated section 64 adjacent the flat section and remote from the air turn. As the discharge air moves onto the perforated sections 64, its velocity is gradually reduced. Preferably the perforated sf~ctions 64 are bent away from the web at a gradual angle, which increases its distance from the web the further- it extends away from the air turn. An angle of about 11° is especially preferred, as best seen in Figure 6. A plurality of perforated 214~a~g bleed ports shown generally at 66 in Figure 3 of the perforated section 64 allow ambient air to be drawn into the gradual increasing area between the web and this sectic>n 64 of the wing.
This also causes the air velocity and turbulence to diminish.
The net result is a smooth discharge of air e:~cpelling from the edges of each air foil wing 61, as shown in Figure 4.
The amount and location of the bleed ports 66 is important to achieve a gradual diffusion or slow down in air velocity coming off the flat, non-perforated portion 63 of the wing.
Preferably the amount and size of the ports increases as the wing extends further from the non-perforated section 63. In a preferred embodiment in which the flat, non-perforated section 63 is 6.0 inches long and 57.75 inches wide (not including brackets 65, 65' ) , the perforated section 64 is 2.028 inches long and includes three generally parallel rows of ports, as best seen in Figure 5. The first row 67 closest to flat:, non-perforated section 63 includes 62 0.25 inch diameter ports spaced 0.875 inches from each other, beginning and ending 1.75 inches from the sides of the wing. The middle row 68 includE=s 126 0.25 inch diameter ports spaced 0.437 inches from each other, beginning and ending 1.312 inches from the sides of the wing. The third row 6~~ furthest from the flat, non-perforated section 63 includes 64 0.375 diameter ports spaced 0.875 inches from each other, beginning and ending 0.875 inches from the sides of the wing.
The perforated section 64 of the wing preferably terminates in a flange portion 70, as can be best seen in Figure 6. In the preferred embodiment, the flange portion 70 is 1 inch long, and includes a row of 0.312 inch diameter ports 71..
Figure 1 is a perspective view of a conventional air turn which can be used in accordance with the present invention;
Figure 2 is a cross-sectional view of a conventional air turn which can be used in accordance with the present invention;
Figure 3 is an isometric view of an air turn having air foil wing extensions in accordance with the present invention;
Figure 4 is a cross-sectional view of an air turn having air foil wing extensions showing the theoretical air flow pattern;
Figure 5 is a top view of an air foil wing in accordance with the present invention; and 4a ~~4~0~~
Figure 6 is a side view of the air foil wing of Figure 5.
DETAILED DESCRIPTION OF THE INVENTION
The web support provided by the present invention can support a moving web through various degrees of turning movement, but the present invention has been illustrated in Figure 1 as showing a web support for an approximate 90° l.urn, wherein the web W passes over and without contact with the support S. It should be understood that the following detaila_d description of the web support is for purposes of illustration and should not be construed as limiting of the present invention. The support S includes a member 1 formed generally with a 90° arcuate surface 2 which extends across the width of the web W to be supported and preferably beyond the edges of the web. Shaft means SM are provided at each side of the support so that t:he device can be suitably mounted in the drier apparatus. A series of substantially parallel or parallel grooves 3 optionally can be formed in the surface of the arcuate member 1 and extend in the direction of web travel as disclosed in the aforementioned U.S.
Patent No. 4,182,472. The grooves preferably are generally rectangular in cross-section, but may assume other configurations so long as the effect thereof is to create .a labyrinth seal whereby the flow of air out from the pressurized cushion is inhibited. The grooves 3 form circumferential ribs 4 and also define the upper surface 2 of arcuate surface. Alternatively, the arcuate surface can be smooth, although it :is preferred that labyrinth seals be formed therein.
Air nozzle N is located along each of the longitudinal ends of the support S and extend the full length thereof transversely across the width of the web being supported. The nozzles are generally U-shaped and have a sharp nozzle edge 6 (Figure 2) spaced a distance from the member 1 so as to define an elongated slot or nozzle 8 through which pressurized a.ir is discharged towards the web. The size of the nozzle opening can be adjusted by a series of screws 12 or the like threadab7Ly engaged in the frame F of the device and extending freely through the nozzle N.
The nozzle is secured to the support by any suitable means, such as screws or the like.
The sides of the support S include end plates 16 secured by cap screws to the ends of the arcuate member 1. The aforementioned shaft means SM are secured to the end plates such as by welding. The shaft means are adjustably mounted in the frame F of the apparatus so that the angular position of the support can be changed by rotating the support on the shafts.
The frame F has a series of holes 20 pas:~ing therethrough and through which pressurized air is fed from the chamber 24.
Chamber 24 is also defined by members 2 and 28 (which can be formed out of sheet metal) secured to a central duct 30 such as by welding. Pressurized air is supplied to the end of the duct 30 by a supply conduit 31 from a suitable air supply AS. The duct 30 has a longitudinal opening 32 which allows air to feed into chamber 24 and be discharged through the nozzle N and to each of the grooves in the arcuate surface.
A barrier 34 may be optionally provided extending transversely to the direction of the web travel and across the grooves 3. The barrier 34 blocks the grooves intermediate their length to form a barrier to the air flow in the grooves and eliminate flow instability and prevent one slot from dominating the other.
Turning now to Figure 3, air foil wing sections 60, 61 are shown, preferably fabricated from stainless steE~l. Each includes a flat, non-perforated portion 63 closest to the air supply slot of the air turn. The discharge air coming from the supply slot increases in velocity as it moves across the flat portions 63 of the wing, which is arranged with respect to the air turn so as to be parallel and in close proximity to the web. To that end, each air foil wing extension can be secured to the air turn by any suitable means, such as by screws attached to the frame of t:he device through brackets 65, 65'. The increased air velocity creates a pressure drop between the flat portions 63 and the web, which tends to draw the web towards the flat portions 63. A
large reduction of web flutter, in the range of 80o to 1000, has been demonstrated. Although wings preferably are used at both the web entry and web exit ends of the web support, if web flutter occurs at only one end in a particular application, only one wing could be used at that end.
The air foil wing extensions also each inc:Lude a perforated section 64 adjacent the flat section and remote from the air turn. As the discharge air moves onto the perforated sections 64, its velocity is gradually reduced. Preferably the perforated sf~ctions 64 are bent away from the web at a gradual angle, which increases its distance from the web the further- it extends away from the air turn. An angle of about 11° is especially preferred, as best seen in Figure 6. A plurality of perforated 214~a~g bleed ports shown generally at 66 in Figure 3 of the perforated section 64 allow ambient air to be drawn into the gradual increasing area between the web and this sectic>n 64 of the wing.
This also causes the air velocity and turbulence to diminish.
The net result is a smooth discharge of air e:~cpelling from the edges of each air foil wing 61, as shown in Figure 4.
The amount and location of the bleed ports 66 is important to achieve a gradual diffusion or slow down in air velocity coming off the flat, non-perforated portion 63 of the wing.
Preferably the amount and size of the ports increases as the wing extends further from the non-perforated section 63. In a preferred embodiment in which the flat, non-perforated section 63 is 6.0 inches long and 57.75 inches wide (not including brackets 65, 65' ) , the perforated section 64 is 2.028 inches long and includes three generally parallel rows of ports, as best seen in Figure 5. The first row 67 closest to flat:, non-perforated section 63 includes 62 0.25 inch diameter ports spaced 0.875 inches from each other, beginning and ending 1.75 inches from the sides of the wing. The middle row 68 includE=s 126 0.25 inch diameter ports spaced 0.437 inches from each other, beginning and ending 1.312 inches from the sides of the wing. The third row 6~~ furthest from the flat, non-perforated section 63 includes 64 0.375 diameter ports spaced 0.875 inches from each other, beginning and ending 0.875 inches from the sides of the wing.
The perforated section 64 of the wing preferably terminates in a flange portion 70, as can be best seen in Figure 6. In the preferred embodiment, the flange portion 70 is 1 inch long, and includes a row of 0.312 inch diameter ports 71..
Claims (7)
1. In a contactless web support having an elongated arcuate surface and over which a running web is floatingly supported, said web support having a pair of elongated nozzles extending along the length of said arcuate surface, each of said nozzles having discharge slots configured to discharge pressurized air over said arcuate surface, said web support including means for supplying pressurized air to said nozzles, a first air foil wing extension fixed to the leading or trailing longitudinal edge of said air turn assembly, said first wing extension comprising a first flat portion extending away from said arcuate surface, and a second perforated section adjacent said first flat portion, such that pressurized air can escape through perforations in said perforated section.
2. The contactless support of claim 1, wherein said second perforated section is positioned at an angle with respect to said first flat portion.
3. The contactless support of claim 2, wherein said angle is about 11°.
4. The contactless support of any one of claims 1 to 3, further comprising a second air foil wing extension fixed to the longitutinal edge of said air turn assembly different from the edge to which said first air foil wing extension is fixed, said second wing extention comprising a flat portion extending away from said arcuate surface, and a perforated section adjacent said flat portion.
5. In a contactless web support having an elongated arcuate surface and over which a running web is floatingly supported, said surface of said web support having a plurality of substantially parallel grooves forming labyrinth seals extending around said arcuate surface in a direction in which the web passes thereover, said web support having a pair of elongated nozzles extending along the length of said arcuate surface, each of said nozzles having discharge slots configured to discharge pressurized air over said arcuate surface, said web support including means for supplying pressurized air to said nozzles, a first air foil wing extensions fixed to the leading or trailing longitudinal edge of said air turn assembly, said first wing extension comprising a first flat portion extending away from said arcuate surface, and a second perforated section adjacent said first flat section.
6. The contactless support of claim 5, wherein said second perforated section is positioned at an angle with respect to said first flat portion.
7. The contactless support of claim 5, further comprising a second air foil wing extension fixed to the longitudinal edge of said air turn assembly different from the edge to which said first air foil wing extension is fixed, said second wing extension comprising a flat portion extending away from said arcuate surface, and a perforated section adjacent said flat portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US22161494A | 1994-04-01 | 1994-04-01 | |
| US08/221,614 | 1994-04-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2145058A1 CA2145058A1 (en) | 1995-10-02 |
| CA2145058C true CA2145058C (en) | 2003-05-27 |
Family
ID=22828551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002145058A Expired - Fee Related CA2145058C (en) | 1994-04-01 | 1995-03-20 | Air foil wing extension for air turn |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0675064B1 (en) |
| JP (1) | JPH0848446A (en) |
| AT (1) | ATE158781T1 (en) |
| CA (1) | CA2145058C (en) |
| CZ (1) | CZ79495A3 (en) |
| DE (1) | DE69500781T2 (en) |
| HU (1) | HUT71216A (en) |
| RU (1) | RU95104881A (en) |
| SK (1) | SK42995A3 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5967457A (en) * | 1996-07-23 | 1999-10-19 | Thermo Wisconsin, Inc. | Airfoil web stabilization and turning apparatus and method |
| US6505792B1 (en) * | 2000-11-28 | 2003-01-14 | Megtec Systems, Inc. | Non-contact floating device for turning a floating web |
| DE102005048217B4 (en) * | 2005-09-29 | 2007-12-06 | Gerhard Bach | Guiding device for guiding flexible flat material |
| JP5152477B2 (en) * | 2007-08-22 | 2013-02-27 | Ｂｅｌｌｍａｔｉｃ株式会社 | Flotation device for film-like materials |
| DE102007058405B4 (en) * | 2007-11-02 | 2010-03-25 | Gerhard Bach | Deflection device for deflecting flexible flat material |
| ES2704100T3 (en) * | 2013-05-08 | 2019-03-14 | Kdesign Gmbh | Calibration device for calibrating an extruded tubular film |
| CN110953852B (en) * | 2019-12-18 | 2021-04-02 | 重庆红果服饰有限公司 | A hang drying device for textile fabric |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3127080A (en) * | 1964-03-31 | Web turning device | ||
| GB1307695A (en) * | 1970-08-19 | 1973-02-21 | Ilford Ltd | Air flotation turner bars |
| US4182472A (en) * | 1978-07-13 | 1980-01-08 | W. R. Grace & Co. | Contactless turning guide for running webs |
| US5242095A (en) * | 1990-12-20 | 1993-09-07 | Advance Systems, Inc. | Contactless air turn guide with baffles for running webs |
| US5317817A (en) * | 1992-04-30 | 1994-06-07 | W. R. Grace & Co.-Conn. | Trailing sheet assembly for an air turn |
-
1995
- 1995-03-20 DE DE69500781T patent/DE69500781T2/en not_active Expired - Lifetime
- 1995-03-20 EP EP95301853A patent/EP0675064B1/en not_active Expired - Lifetime
- 1995-03-20 CA CA002145058A patent/CA2145058C/en not_active Expired - Fee Related
- 1995-03-20 AT AT95301853T patent/ATE158781T1/en active
- 1995-03-29 CZ CZ95794A patent/CZ79495A3/en unknown
- 1995-03-30 RU RU95104881/12A patent/RU95104881A/en unknown
- 1995-03-31 HU HU9500958A patent/HUT71216A/en unknown
- 1995-03-31 SK SK429-95A patent/SK42995A3/en unknown
- 1995-03-31 JP JP7075675A patent/JPH0848446A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE69500781D1 (en) | 1997-11-06 |
| CA2145058A1 (en) | 1995-10-02 |
| EP0675064B1 (en) | 1997-10-01 |
| ATE158781T1 (en) | 1997-10-15 |
| JPH0848446A (en) | 1996-02-20 |
| HUT71216A (en) | 1995-11-28 |
| RU95104881A (en) | 1996-12-20 |
| DE69500781T2 (en) | 1998-02-26 |
| SK42995A3 (en) | 1995-10-11 |
| CZ79495A3 (en) | 1995-12-13 |
| EP0675064A1 (en) | 1995-10-04 |
| HU9500958D0 (en) | 1995-05-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20140320 |