JP3136400B2 - Web running direction changing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web running direction changing apparatus for converting a running direction of a web into a curved shape and guiding the web winding side in a floating state.

[0002]

2. Description of the Related Art Conventionally, a web running direction changing apparatus is disclosed in Japanese Patent Application Laid-Open No. 2-163256. As shown in FIGS. 6 and 7, the web traveling direction changing device 1 has a flotation device 2 disposed on a side A around which a web traveling path R curved in an arc shape is wound. The flotation device 2 has a plurality of nozzle boxes 3 arranged in a curved shape along the web running direction, each nozzle box 3 includes a gas holding surface 4 facing the web running path R, and the web running path R and the gas holding surface. Gas outlets 5 and 5 for supplying gas are provided between the nozzle 4 and a sheet-like web W running on the web running path R.
A gas layer having a positive static pressure is formed between the gas W and the gas holding surface 4 to support the web W in a floating state (see Japanese Patent Application Laid-Open No. Sho 59-66681). The web traveling direction changing device 1 may be arranged on the entrance side or the exit side of the flotation type drying device 6 in some cases.

[0003] As a different floating device, although not shown, a gas holding surface which is curved in the entire web running direction changing region, and gas discharge ports which are formed on both sides of the gas holding surface in and out of the gas holding surface. (See Japanese Patent Publication No. 58-39746) or a porous plate having a plurality of gas discharge ports formed on a similarly curved gas holding surface (see Japanese Patent Application Laid-Open No. Sho 62-76).
171855).

[0004]

By the way, the positive static pressure of the air layer formed between the web W and the gas holding surface 4 is such that both ears of the web W are lower and that the waist near the center of the web W is lower. It tends to be higher. Therefore, in the case of a thin plastic film or the like having a low web tension, the floating amount of the web W near the center of the web W becomes large,
There is a case where the vehicle travels in an inflated state, and vertical wrinkles may be generated on the web W on the entrance / exit side of the web traveling direction changing device 1. The vertical wrinkles change into vertical folding wrinkles, or come into contact with the nozzle box 7 of the flotation type drying device 6 to cause scratches, thereby causing defects in the web W and significantly lowering the yield. There is a thing to make.

[0005] In order to solve the above-mentioned problems, the present invention provides a web traveling direction changing apparatus which does not cause the web to expand when a floating device is arranged on the side where the curved web traveling path is wound. With the goal.

[0006]

According to a first aspect of the present invention, there is provided a method for preventing a web from inflating, which faces the web traveling path on the side where the curved web traveling path is wound. In a web running direction changing device provided with a gas holding surface and provided with a flotation device having a gas discharge port for supplying gas between the web running path and the gas holding surface, the web running direction is opposite to the winding side. A plurality of web guide rollers extending in the cross direction of the road are arranged, and the outer peripheral surface of each web guide roller is brought into contact with the web travel path, and the web guide rollers are forcibly driven to form the web.
Place the web suction device on the side where the guide rollers are placed
As a result, the contact of the web with the web guide roller
This is to increase the area. According to the present invention, even if the web traveling on the web running path is about to be inflated by the flotation device, the web is brought into contact with the outer peripheral surface of the web guiding roller to prevent the web from expanding. Can be.

Further, according to the present invention, the web is gripped with respect to the web guide roller, and the web is reliably run without causing slippage between the web guide roller and the web which are forcibly driven. be able to. In addition,
This web suction device covers each of the web guide rollers so as to be sandwiched by a partition plate while leaving a web contact surface area, and a slit-like slit extending in the longitudinal direction of the roller between the leading edge of each partition plate and the outer peripheral surface of the roller. In some cases, a suction gap is formed to generate a suction pressure having a uniform distribution in the longitudinal direction on the web contact surface area side of the outer peripheral surface of the roller, so that the traveling web is evenly suctioned to the roller side.

[0008]

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a web traveling direction changing device according to the present invention (hereinafter referred to as "the present invention device") will be described based on an embodiment shown in the drawings.

(First Embodiment) FIGS. 1 to 3 show a first embodiment of the apparatus of the present invention. FIG. 1 is a left side view in partial section, and FIG. FIG. 3 is a cross-sectional view showing the left half on line C, and FIG. 3 is a left side view showing another embodiment.

The improvement of the web running direction changing device 11 is as follows.
On the side B opposite to the side A around which the curved web running path R winds,
A plurality of web guide rollers 12 extending in the left-right direction (direction of arrow E), which is a transverse direction of the web travel path R, are rotatably arranged, and the outer peripheral surface of each web guide roller 12 is disposed on the web travel path R. 12a is brought into contact. Each roller 12 may be forcibly driven at the same speed as the traveling speed of the web W so as not to give a large back tension to the low tension web W traveling on the web traveling path R.

On the other side B, as shown in FIGS. 1 and 2,
A web suction device 13 for increasing the contact area of the web W with the roller 2 is provided. Web suction device 1
Reference numeral 3 denotes a suction box 14 arranged so as to cover the rollers 12, 12,... Except for a guide surface side of the rollers 12, 12,... Which contacts the web W, and a suction fan joined to a suction port 14b communicating with the inside 14a of the box. (Not shown), and a negative static pressure is applied between the adjacent rollers 12 to suck the traveling web W toward the rollers.
By gripping the web W with respect to the roller 12, the web suction device 13 can reliably run the web W without causing slippage between the roller 2 and the web W that are forcibly driven.

As shown in FIG. 3, the web suction device 13 covers the rollers 12 so as to be sandwiched between the partition plates 15 and 15 except for the web contact surface area 12b. A slit-like suction gap 16 is formed between the outer peripheral surface 12a and the outer peripheral surface 12a to generate an evenly distributed suction pressure in the longitudinal direction of the roller outer peripheral surface 12a on the side of the web contact surface. In some cases, suction may be performed evenly.

The web suction device 13 and each roller 12
It is disposed so as to be able to advance and retreat toward the web traveling path R, and is operated to advance and retreat by operating tools 20 and 20 such as air cylinders.
It is configured to be able to advance and retreat from the advanced web guide position shown in the figure to the retracted web passing position.

A flotation device 2 similar to the conventional one is arranged on the side A around which the curved web running path R is wound. The flotation device 2 has a plurality of nozzle boxes 3 arranged in a curved shape along the web traveling direction. Each nozzle box 3 is provided with a gas holding surface 4 extending in the left-right direction and facing the web running path R, and a slit-shaped gas discharger for supplying gas between the web running path R and the gas holding surface 4. Exits 5 and 5 are opened. The flotation device 2 includes a blowing chamber 17 communicating with the inside 3a of each nozzle box 3, a reflux chamber 18 formed to cover each nozzle box 3 except for a side facing the web running path R, and an adjacent nozzle. A rectifying plate 19 made of a perforated plate or the like disposed between the boxes 3 and 3 is provided.

When air is blown from a blower (not shown) to the blow chamber 17, the flotation device 2 discharges air from the gas discharge ports 5 and 5 of each nozzle box 3, and the web W and each nozzle box 3 are discharged.
A gas layer having a positive static pressure is formed between the gas holding surface 4 and the gas holding surface 4 to support the web W in a floating state, and the air separated from the web W is collected by the return chamber 18 via the rectifying plate 19 and the blower ( (Not shown). In addition, when the flotation device 2 blows warm air to each nozzle box 3,
It also has a function as a drying device.

The web running direction changing device 11 constructed as described above is provided with each of the web guiding rollers 12, 12... Even if the web W traveling on the web running route R is about to be inflated by the flotation device 2. The web W is brought into contact with the outer peripheral surface 12a to prevent the web W from inflating, so that no vertical wrinkles are generated on the web W. The web W having no vertical wrinkles can smoothly travel to the next floating type drying device or the like without generating vertical wrinkles.

(Second Embodiment) FIGS. 4 and 5 show a second embodiment other than the present invention. FIG. 4 is a left side view with a partial cross section, and FIG.
It is sectional drawing which shows the left half in the -D line.

The improvement of the web running direction changing device 21 is as follows.
On the side B opposite to the side A around which the curved web running path R winds,
An outer flotation device 22 having a plurality of inflating preventing nozzle boxes 23 arranged in a curved shape along the web running direction is disposed, and a web is interposed between the inner flotation device 2 and the outer flotation device 22. This is to support W in a floating state.
Each of the nozzle boxes 23 for preventing inflation is configured substantially the same as the nozzle box 2, includes a gas holding surface 4 facing the web running path R, and includes the web running path R and the gas holding face 4.
Slit-like gas discharge ports 5 and 5 for supplying gas between
Has been established. The flotation device 22 includes a ventilation chamber 27 communicating with the inside 23a of each nozzle box 23, a return chamber 28 formed to cover each nozzle box 23 except for a side facing the web running path R, and an adjacent nozzle. Box 23,
And a rectifying plate 29 made of a perforated plate or the like disposed between them.

When air is blown from a blower (not shown) to the blower chamber 27, the flotation device 22 discharges air from the gas discharge ports 5 and 5 of each nozzle box 23, and holds the web W and the gas in each nozzle box 23. A gas layer having a positive static pressure is formed between the surface 4 and the web W to support the web W in a floating state, and the air separated from the web W is collected by the return chamber 28 via the rectifying plate 29 to be blown (not shown). To be sucked.

The nozzle box 23 for preventing inflation of the outer flotation device 22 is not shown, except that it is disposed so as to face the nozzle box 2 of the inner flotation device 2. Can be arranged so as to face the current plate 19 between the adjacent nozzle boxes 2 and 2.

The web running direction changing device 21 is provided with an inner floating device 22 for preventing the web W traveling on the web running path R from being expanded by the inner floating device 2. The gas layer formed on the gas holding surface 4 of the nozzle box 23 can prevent inflation of the web, and
The web W can be supported in a levitated state between the two levitating devices 2 and 22. Further, since the gas traveling direction changing device 21 has a positive static pressure in the gas layer formed on the gas holding surface 4 of the nozzle box 23 for preventing inflation, the web W with respect to the nozzle box 23 for preventing inflation. The contact can be completely prevented, and no damage such as scratches is given to the web W.

(Other Embodiments) First and Second Embodiments
In the embodiment, although not shown, the inner flotation device 2 has a gas holding surface curved and formed in the entire web traveling direction changing region, and a gas discharge port opened on both the entrance and exit edges of the gas holding surface. (See Japanese Patent Publication No. 58-39746) or a porous plate having a plurality of gas discharge ports formed on a similarly curved gas holding surface (see Japanese Patent Application Laid-Open No. Sho 62-76).
171855).

[0024]

According to the present invention, by preventing the web from being inflated, vertical wrinkles which cause web defects are not generated, and the yield can be greatly improved.

Further, the apparatus according to the present invention can eliminate abrasion of the web by reliably running the web without causing slippage between the web guiding roller and the web which are forcibly driven.

[0026]

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the device of the present invention, and is a left side view with a partial cross section.

FIG. 2 is a cross-sectional view showing a left half on line CC of FIG. 1;

FIG. 3 is a left side view showing another mode in the first embodiment.

FIG. 4 shows a second embodiment outside the present invention, and is a left side view with a partial cross section.

FIG. 5 is a cross-sectional view showing a left half taken along a line DD in FIG. 4;

FIG. 6 is a side view showing a conventional web running direction changing device and a drying device.

FIG. 7 is a partially enlarged left side view of the conventional web traveling direction changing device.

[Explanation of symbols]

2 Floating device, 4 Gas holding surface, 5 Gas outlet, 12
... Web guiding roller, 13 ... Web suction device, 23 ...
Nozzle box for preventing swelling, A: winding side, B: opposite side,
R: Web running path

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 23/32 B65H 23/24

Claims (1)

(57) [Claims] 1. A side on which a curved web running path is wound,
A web traveling direction changing device provided with a gas retaining surface facing the web traveling route and a flotation device having a gas discharge port for supplying gas between the web traveling route and the gas retaining surface, On the opposite side, a plurality of web guide rollers extending in the transverse direction of the web travel path are arranged, and the outer peripheral surface of each web guide roller is brought into contact with the web travel path, and the web guide rollers are forcibly forced. Drive
To move the web guide roller to the side where the web guide roller is located.
By arranging a pulling device, it is possible to
A web running direction changing device characterized in that a contact area of a web to be processed is increased.