JPS6093056A - Direction converting device for web feed - Google Patents

Abstract

PURPOSE:To uniformly float a web in feed without chatter and flattering thereof for the reliable and smooth feed by providing an outwardly extending guide plate member on both edges of a guide surface of a direction converting member arc-shaped in its cross section and provided with many fluid injection port. CONSTITUTION:A direction converting member 1 having a guide surface 11 including many fluid injection ports 12 provided thereon is formed as arc-shaped in its cross section at 90 deg. in its central angle. A web W is supported in a state keeping substantially uniform floating height thereof by shortening a fluid passage of a fluid injected from the fluid injection port 12 until it reaches both ends of the guide surface 11 along it, and averaging pressure distribution of the fluid applied to the web W. A guide plate member 2 along in a direction where the fluid flows out is provided on a web introduction end S1 and a web delivery end S2 being the both ends of the guide surface 11 of the aforesaid direction converting member 1, so that a separation phenomenon disturbing a boundary layer of the fluid formed along the guide surface 11 can be prevented from being produced, enabling the web W to be smoothly fed without chatter and flattering.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for changing the conveyance direction of a continuously conveyed web.

[Prior art]

Web conveyance (2) that changes the conveyance direction of long webs made of paper, plastic, cloth, metal, etc. and has a relatively large width of 0.2 to 3 m. (2) As a type of direction change device. , reparser, turnno etc.
There is a system called "Fluid Cushion Full Valve" which guides the web in a floating state.

A conventional web conveyance direction changing device called a glue parser has a semi-cylindrical overall shape, as shown in FIGS. A large number of fluid ejection ports 12 are provided for ejecting fluid such as air or nitrogen gas to form a fluid cushion between the web W and the guide surface 11. 8. The arrow in the figure indicates the direction in which the web W is conveyed.

However, the device having such a configuration has the following drawbacks.

(B) As shown in FIG. 2, the central part CI of the guide surface 11
The flying height of the web W at Cjc; is larger than the flying height of the web W at the web introducing end S1 and the web leading end S2 of the guide surface 11, and the value is not constant. The web W cannot be floated in a uniform state along the guide surface 11, which causes unevenness in the transport speed of the web W. It is.

(b) In addition, when the fluid forming the entire fluid cushion flows outward from the web introduction end S1 and the web exit end S2 of the guide surface 11, the boundary layer of the fluid spreads out, so-called "separation". As the fluid flow is disturbed due to this phenomenon, local vibrations such as chatter and fluttering occur in the web W being conveyed, and smooth conveyance of the web W is inhibited.

In addition, the conventional web conveyance direction changing device called a turn bar has a cylindrical overall shape as shown in FIGS. is formed.

In an apparatus having such a configuration, a phenomenon occurs in which the web W rises to a large extent at the medium heat section and floats to a small extent at the web introduction end Sl and the web outlet end S2, just as in the case of a reno scrubber. Further, a web introducing end S1 and a web leading end S2
Odors, wavy edges of the web W, and fluttering occur, which impedes smooth conveyance of the web W.

The conventional web conveyance direction changing device 1cj'ci described above
The disadvantages of this become more pronounced as the width of the web being conveyed becomes more difficult to carry, and for example, if the width of the web is 5 m or more, it actually becomes difficult to convey the web.

[Purpose of the invention]

The purpose of this invention is to completely eliminate the drawbacks of the conventional web feeding direction changing device (-) to float the web in a uniform state without chatter or flapping, and to change the direction of the web smoothly and reliably. It is an object of VC to provide a device for changing the direction of web conveyance.

[Structure of the invention]

The web conveyance direction changing device according to the present invention includes a direction changing part formed with a large number of fluid ejection ports over the entire guide surface having an arcuate cross-sectional shape, and a web conveying direction on one side of the guide of the direction changing part. The present invention is characterized in that it includes guide plate members provided on both edges of the direction changing part and extending outward along the guide surface of the direction changing part.

[Embodiments of the invention]

(5) In one embodiment of this invention, as shown in FIG.
A cylindrical direction changing member l having a guide surface 11 having an arcuate cross-sectional shape, and a guide plate member 2 formed along both edges of the guide surface 11 of the direction changing member l in the web conveying direction K. It is composed of.

A large number of fluid jet ports 12 are formed on the guide surface 11 of the direction changing member 1 to jet fluid such as pressurized air or nitrogen gas. The central angle θ of each arc of the guide 1 and 11 is most preferably 90°, but it can be changed depending on the usage situation, and a range of 70 to 110° is practical. The curvature diameter R of the guide surface 11 is set depending on the size tx of the web W to be conveyed, but is usually lOO~100.
100O, but in practical terms it is about 200 to 600 tones.

Further, the width of the direction changing member I is set depending on the width of the web W to be conveyed, and is usually 200 to 400011111.
Practically speaking, it is approximately 600 to 2,500 degrees.

The guide plate member 2 has a guide surface 11 of the direction changing member 1.
(6) of the guide surface 11 and extends outward in the extension direction. The direction in which this guide plate member 2 extends is preferably the tangential direction of the guide surface 11, but it can normally be changed within a range of 20° upward and 100° downward with respect to the tangent, and practically, it can be changed by 5° upward and downward. Within Length of guide plate member 2! is the guide surface 11 of the direction changing member l.
It is set depending on the speed of the fluid flowing through the soil, but it is usually 50 to 300 nO++.

Practically speaking, it is about 90 to 120W. Further, it is desirable that the entrance surface of the guide plate member 2 on the side where the web Wi guide P is flat is a flat surface, but it may be entirely curved depending on the conveyance line of the web W.

According to the above configuration, the pressurized fluid ejected from the fluid ejection port 12 of the guide surface 11 of the direction changing member l causes the guide surface 11. Since a fluid cushion is formed between the web W conveyed by J:lC:Fd and the guide surface 11, the web W is held in a suspended state from the guide surface 11, and further forms the guide surface 11. It is transported along a curved surface while changing its direction of travel.

At this point, the center angle of the guide surface 11 of the direction changing member 1 (7) is necessarily around 90 degrees, which is about half that of the conventional 9-circle case, so the guide Face 11
Fluid spout 12. r,,! The flow path through which the ejected fluid passes along the guide [i\111 to reach the web introduction end Sl or the web exit end S2 is short, and the fluid flows within the space formed by the guide surface 11 and the web W. The fluid is less likely to be trapped in the fluid, making it easier to flow out, so the fluid flows out smoothly with less resistance. As a result, the pressure distribution of the fluid acting on the two webs W is averaged, and the webs W are stably supported while maintaining a substantially uniform floating height.

Furthermore, since the guide plate member 2 along the outflow direction of the fluid is provided at the web introducing end 81 and the web leading end 82, the direction can be changed! The occurrence of a separation phenomenon in which the fluid boundary layer formed along the guide surface 11 of the material 11 is disturbed is suppressed. As a result, the web W can be smoothly conveyed without chatter or fluttering at the web introduction end S1 or the web lead-out end S2.

moreover? 8. Since the center angle of the arc of the guide surface 11 of the direction changing member 1 is around 90° or 7, which is the most basic angle for defining the direction, By combining a plurality of web conveyance direction changing devices, the traveling direction of the web W can be arbitrarily regulated.
This makes it possible to form a variety of web conveyance lines.

For example, as shown in FIG. ,
The web W can be rotated by 180° in the same way as the turner. In addition, as shown in FIG. 7, by arranging three web conveyance direction converting devices G at positions sequentially rotated by 90 degrees with respect to the center O, the web traveling direction can be changed in two directions.
Can be rotated 70 degrees. Furthermore, as shown in FIG. 8, by arranging the VC and the two web conveyance direction converting devices Gi at points symmetrical to each other with respect to the center O,
To move the web W in parallel without changing the entire traveling direction (9
) can be done. Furthermore, as shown in FIG. 9, by arranging the two web conveyance direction converting devices G= apart from each other in the direction of the guide plate member 2, the web W can be conveyed freely with nothing in between. It is also possible to perform a large parallel tea. As described above, the web conveyance direction changing device according to this embodiment is not only convenient for reversing the queso, but also
Highly functional with a variety of combinations of birds.

〔Effect of the invention〕

As described above, according to the present invention, the following effects can be achieved.

(b) The web can be suspended in a uniform state and transported in a stable state.

(b) Vibrations such as chatter and tackiness do not occur in the web, and the web can be conveyed smoothly.

eJ can be combined into various arrangements to form a variety of web conveyance lines.

[Brief explanation of the drawing]

1 and 2 are an explanatory perspective view showing an example of a conventional web conveyance direction changing device, and (10) an explanatory side view, and FIGS. 3 and 4 are an explanatory side view and a conventional FIG. 5 is an explanatory perspective view and an explanatory side view showing another example of the web conveyance direction changing device according to the present invention; FIG. ~Figure 9 is 71. Part 9 is an explanatory diagram showing an example of the arrangement of the web conveyance direction changing device according to the present invention. ]... Direction changing member 11... Guide surface 12...
Fluid spout W...Web C...Central part si...
・Web introduction end S2..., web lead-out end 2...Guide plate member G...Web conveyance direction conversion device Fig. 7 Fig. 8

Claims (1)

[Claims] ■) A direction changing section formed by forming a large number of fluid jet ports over the entire guide surface whose surface shape is an arc, and a direction changing section in which the 141st surface of this direction changing section is in the web carrying direction? A web conveyance direction changing device characterized by comprising a purple guide P plate m-411 extending outward along a guide surface of a direction changing section and extending outwardly along a guide surface of a direction changing section. 2) The central angle of one arc of the guide surface of the direction changing part is 70~1
100, the web conveyance direction changing device according to claim 1.