JPH0447171Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a floater support for conveying a web in a non-contact manner.

[Prior art]

An example of a device for conveying a web in a non-contact manner is the one provided in Japanese Utility Model Publication No. 11971/1983. This device levitates a running web by using fluid ejected from fluid ejection holes provided in an arc-shaped guide surface of a cylindrical body, and the device levitates a running web according to changes in the width of the web along the arc-shaped guide. Accordingly, a movable side guide is provided to confine the fluid and obtain a fluid cushioning effect.

Although it is possible to obtain a fluid cushioning effect with this device, since the sides of the side guides are tapered so that the upper part widens outward, there is considerable waste in containing the fluid, and the web The acting force in the width direction is weak, and a considerably large fluid flow rate is required for the web to automatically move to the center of both side guides. Further, the fluid is supplied to the center of the cylindrical body and discharged from the jet hole, and the position cannot be moved in the width direction of the web even if the flow rate of the fluid is adjusted.

Therefore, if the web has, for example, uneven moisture content or uneven coating, which causes meandering or misalignment, it has been impossible to repair or control this.

[Purpose of invention]

The present invention was devised in view of the above-mentioned circumstances, and by changing the shape of the side surface of the side guide, the air entrapment effect is increased, thereby making it effective even with a relatively small flow rate. By raising the web automatically and automatically moving the web to the center position of both side guides, and adjusting the flow rate of air supplied, it is possible to easily and quickly position the web in the width direction. This provides a floater support for web conveyance that can be adjusted accurately and has a so-called EPC function.

[Structure of the idea]

For this reason, the present invention provides a cylinder 1 in which a discharge port 2 is formed along the longitudinal direction, and a pair of side guides 3, 3 that slide closely at the position of the discharge port on the outer peripheral surface of the cylinder. In the floater support for web conveyance, each of the side guides 3, 3 is composed of a slide piece 3b and a rising piece 3a rising at the inner end of the slide piece, and the rising piece 3a near the upper end is diagonally inward. bent, and
A pair of air introduction pipes 4 are provided in the center of the interior of the cylinder 1.
The tip openings 4a, 4a of the cylinder body 1 are arranged to face both sides of the cylinder body 1, and the pair of air introduction pipes have air inlet into the cylinder body according to the discharge port 2 appearing between the side guides 3, 3. An air flow rate adjustment device is provided to adjust the flow rate of the air.

〔Example〕

In the figure, 1 is a cylinder, and a discharge port 2 consisting of a slit or a large number of through holes is formed in the upper wall of the cylinder 1 along its longitudinal direction.

Reference numerals 3 and 3 denote a pair of side guides provided on the upper surface of the cylindrical body 1, and the side guide 3 consists of an upright piece 3a and a slide piece 3b. The entire upright piece 3a is substantially plate-shaped, its upper end is bent obliquely inward, and its lower end is fixed to the end of the slide piece 3b. 4, 4 are air introduction tubes, and the tip openings 4a, 4a of the air introduction tubes 4, 4;
is placed in the center of the cylinder 1, and the cylinder 1 is
It allows air to flow in both directions. Further, valves 5, 5 are attached to the air introduction pipe 3 at appropriate positions to adjust the flow rate of air supplied into the cylinder body 1.

Next, the above action will be described. valve 5,5
When opened, compressed air flows into the cylinder 1 through the openings 4a, 4a of the air introduction pipes 4,4. Since the openings 4a, 4a of the air introduction pipes 4, 4 are oriented toward both sides of the cylinder 1, the inflowed air flows into the cylinder side 1.
The air flows out in both directions, and is then discharged from the discharge port 2. Of course, air is not discharged from the discharge port 2 which is closed by the slide piece 3b of the side guide 3. The interval between the upright pieces 3a, 3a of the side guide 3 is adjusted by sliding the slide pieces 3b, 3b so that it is slightly wider than the width of the web W to be conveyed. In this case, the standing piece 3
The center portions of a and 3a are usually located at the center of the cylinder 1 in the longitudinal direction.

In this state, the web W is lifted up by the pieces 3a, 3a.
When the web W is run during this period, the web W is floated by the air discharged from the discharge port. The air blown onto the web W escapes from both sides and the front and rear portions of the web W. When air escapes from the side of the web W, the air collides with the upright pieces 3a, 3a, and back pressure is generated. That is, since the tip openings 4a, 4a of the air introduction pipes 4, 4 are directed to both sides of the cylinder 1, the air ejected from the discharge port 2 has a strong pressure against the web W at both ends of the cylinder 1. The water is ejected with a weak pressure near the center, so the reaction force of the back pressure and the secondary flow work effectively to apply a pushing force to the end of the web W toward the center. Since the pressure is generated on both sides of the web, the web W is pressed from both sides and automatically runs through the center of both side guides.

In addition, depending on the width of the web W, the side guides 3, 3
In order to adjust the balance of the amount of air flowing into the cylinder 1 from the openings 4a, 4a according to the amount of air discharged from the discharge port 2 appearing between the side guides when adjusting the relative spacing between the side guides. An air flow regulating device, for example a valve 5, is provided.

[Effect of idea]

The present invention is as described above, and since the upper end of the rising piece of the side guide is bent inward, air can be trapped more effectively, and the web can be effectively levitated even with a relatively small air flow rate. In addition, since the tip opening of the air introduction tube is directed toward both sides of the cylinder, the reaction force of the back pressure and secondary flow of the air that collides with the upright piece of the side guide are effectively reduced. The web automatically travels to the center position, and by adjusting the opening and closing of a device such as a valve that adjusts the air flow rate, the amount of discharge from the discharge port between the side guides and the air intake pipe are adjusted. By adjusting the balance with the amount of air flowing into the cylinder from the opening, it can be operated very easily, quickly and smoothly.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention;
The figure is a cross-sectional view thereof. DESCRIPTION OF SYMBOLS 1... Cylindrical body, 2... Discharge port, 3... Side guide, 3a... Upright piece, 3b... Slide piece, 4...
...Air introduction pipe, 4a...Tip opening, 5...Valve, W...Web.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical body 1 having a discharge port 2 formed along its longitudinal direction is provided, and a pair of sides slide closely to the position of the discharge port on the outer peripheral surface of the cylinder. In a floater support for web conveyance provided with guides 3, 3, each of the side guides 3, 3 is composed of a slide piece 3b and a rising piece 3a rising at the inner end of the slide piece, and the upper end of the rising piece 3a. The part is bent diagonally inward, and the tip openings 4a, 4a of the pair of air introduction pipes 4, 4 are arranged in the center of the interior of the cylinder 1, facing toward both sides of the cylinder 1. In this floater support for web conveyance, the pair of air introduction pipes are provided with an air flow rate adjustment device for adjusting the flow rate of air into the cylinder according to the discharge port 2 appearing between the side guides 3, 3. (2) The floater support for web conveyance according to claim 1, wherein the discharge port is a slit.