JP6819373B2 - Floating device and tension detector - Google Patents

Description

The present invention relates to a levitation device and a tension detection device.

The following Patent Document 1 includes a floater in which a large number of discharge holes and back pressure detection holes are formed, and the object to be measured is levitated from the upper surface of the floater by injecting air from the discharge holes toward the object to be measured. At the same time, a non-contact fluid measuring device for measuring the weight and thickness of an object to be measured by detecting the pressure of air flowing into the back pressure detecting hole with a pressure sensor is disclosed. Further, Patent Document 1 describes that a porous body is used for the floater. That is, Patent Document 1 discloses that innumerable communication holes of the porous body are used as discharge holes.

Japanese Unexamined Patent Publication No. 2001-033229

By the way, since innumerable communication holes are formed in the porous body as a whole, it is not necessary to form a large number of discharge holes in the base material constituting the floater by machining or the like, and therefore the floater can be manufactured at a relatively low cost. It is possible to do.

However, since the porous body has innumerable communication holes dispersed as a whole, the air to be injected toward the object to be measured directly flows into the back pressure detection hole (detection hole) (that is, the back pressure detection hole). There is a concern that the fluid will flow in from the side surface in the stretching direction of the. When such a phenomenon occurs, the air directly flowing into the detection hole does not necessarily reflect the state of the object to be measured, so that the measurement accuracy of the weight and thickness of the object to be measured is significantly reduced. There is a risk of doing.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the fluid from directly flowing into the detection hole when the fluid is injected onto the object to be measured using a porous body. Is.

In order to achieve the above object, in the present invention, as a first solution relating to the levitation device, a porous body having a support surface, a gas supply device for supplying levitation gas to the porous body, and the support A cylinder provided on the surface, a through hole extending from the opening and formed in the porous body, and at least a part thereof surrounded by the inner peripheral surface of the through hole and extending to the opening surface of the opening. A means of providing a body and a pressure sensor that communicates with the tubular body is adopted.

In the present invention, as a second solution relating to the levitation device, the tubular body is provided with a flange surface.
A means is adopted in which the flange surface is in contact with the porous body or a member extended to the porous body.

In the present invention, as a third solution according to the levitation device, a fluid jetted from the surface of the porous body toward the object to be detected is taken in from the detection holes formed in the porous body to take in the object to be detected. A levitation device that detects a levitation pressure and adjusts the injection amount of the fluid based on the levitation pressure, and adopts a means that the detection hole is provided with a shielding wall against the fluid on the peripheral surface.

In the present invention, as a fourth solution relating to the levitation device, in the third solution, the shielding wall is formed by a tubular member fitted into a through hole of the porous body. To do.

In the present invention, as a fifth solution relating to the levitation device, in the fourth solution, the tubular member is provided with a flange portion that abuts on the back surface side of the porous body.

In the present invention, as a sixth solution relating to the levitation device, in the fourth or fifth solution, the tubular member has a mounting portion on which the tip of the connecting tube is mounted on the back surface side of the porous body. Adopt the means of preparing.

In the present invention, as a seventh solution relating to the levitation device, in the third solution, the shielding wall is formed by a coating film formed in a through hole of the porous body. ..

In the present invention, as a solution relating to the tension detection device, a levitation device according to any one of the first to seventh solutions is provided, and the levitation pressure is detected as a tension acting on the object to be detected. Is adopted.

According to the present invention, it is possible to prevent the fluid from flowing into the back pressure detection hole when the fluid is injected onto the object to be measured using the porous body.

It is a front view (a) and the main part side view (b) which show the whole structure of the tension detection device and the levitation device which concerns on one Embodiment of this invention. It is sectional drawing of the main part of the tension detection device and the levitation device which concerns on one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The tension detection device according to the present embodiment uses a strip-shaped sheet W as a tension (tension) object to be detected. For example, FIG. 1 is a configuration example of a traveling device for traveling the seat W in the longitudinal direction. That is, this tension detection device is provided on the traveling system road of the seat W, and the seat W is supported by the support surface F of the tension detection device in a floating state. The tension detection device detects the tension of the seat W by measuring the back pressure of the seat W supported by the support surface F.

As shown in FIG. 1A, the tension detection device according to the present embodiment includes an air turn bar 2, a levitation air supply unit 3, and a back pressure detector 4. Further, guide rollers 1A and 1B for guiding the seat W are provided on the transport path. The guide rollers 1A and 1B are free rollers having the same turning radius and facing each other in parallel at a predetermined distance. The pair of guide rollers 1A and 1B have a rotation axis in a direction orthogonal to the traveling direction (longitudinal direction) of the sheet W (direction perpendicular to the paper surface in FIG. 1A) and a cylindrical peripheral surface (cylinder). The surface) is a contact surface that comes into contact with the sheet W.

A sheet W is wound around the guide rollers 1A and 1B with a predetermined winding angle.

The air turn bar 2 is provided at an intermediate position between the guide rollers 1A and 1B. The air turn bar is a semi-cylindrical member, and includes a support surface F having a substantially arc shape in a cross section formed by a surface formed by a transport direction of the sheet W and a perpendicular direction of the support surface. However, it is not essential that the support surface has a substantially arc shape in a cross section orthogonal to the transport direction. For example, the support surface is composed of two curved surfaces separated in the transport direction and a flat surface connecting the two curved surfaces. It is also possible to do. The axis of the air turn bar 2 is set in the same direction as the rotation axes of the pair of guide rollers 1A and 1B, and as shown in FIG. 1A, the sheet W has a predetermined winding angle on the injection surface F. The positions are set with respect to the pair of guide rollers 1A and 1B so as to wrap around (semi-cylindrical surface). That is, the guide rollers 1A and 1B are arranged so that the support surface protrudes from the tangent plane. Alternatively, it can be said that the seat W has a center of curvature on the air turn bar 2 side and is turned when viewed from the surface of the seat W supported by the air turn bar 2 in a cross section orthogonal to the transport direction.

The air turn bar 2 is supported in a non-contact state with the seat W by ejecting the levitation air (fluid) supplied from the levitation air supply unit 3 from the support surface F toward the seat W. Further, as shown in FIG. 1B, the air turn bar 2 is formed with three detection holes 2a, 2b, 2c separated in the axial direction (that is, the transport width direction). These three detection holes 2a, 2b, 2c are connected to the levitation pressure detector 4 via connection tubes 5a, 5b, 5c, respectively. The levitation pressure detector 4 measures the back pressure between the seat W supported by the support surface F and the support surface F. Each of the connecting tubes 5a, 5b, and 5c of the present disclosure is made of a flexible material such as a resin tube, but the present invention is not limited to this, and a metal tube or the like can also be used.

As shown in FIG. 1B, such three detection holes 2a, 2b, and 2c are provided at positions corresponding to the vicinity of the center and the vicinity of both ends in the transport width direction of the sheet W. That is, of the three detection holes 2a, 2b, 2c, the detection hole 2a is located near the left end in the width direction of the sheet W, the detection hole 2b is located near the center in the width direction of the sheet W, and the detection hole 2c Is located near the right end of the sheet W in the width direction.

The levitation pressure detector 4 is connected to the air turn bar 2 via the connection tubes 5a, 5b, 5c, and flows in through the detection holes 2a, 2b, 2c of the air turn bar 2 and the connection tubes 5a, 5b, 5c. The back pressure of the floating air is detected as the floating pressure of the seat W. More specifically, the levitation pressure detector 4 includes three pressure sensors 4a, 4b, 4c corresponding to the detection holes 2a, 2b, 2c of the air turn bar 2. Of these three pressure sensors 4a, 4b, 4c, the pressure sensor 4a is connected to the detection hole 2a via the connection tube 5a, the pressure sensor 4b is connected to the detection hole 2b via the connection tube 5b, and the pressure sensor The 4c is connected to the detection hole 2c via the connection tube 5c.

Such a pressure sensor 4a detects the back pressure of the seat W in the detection hole 2a, that is, the levitation pressure of the seat W near the left end of the seat W in the width direction. Further, the pressure sensor 4b detects the levitation pressure of the seat W in the detection hole 2b, that is, the levitation pressure of the seat W near the center of the seat W in the width direction. Further, the pressure sensor 4c detects the levitation pressure of the seat W in the detection hole 2c, that is, the levitation pressure of the seat W in the vicinity of the right end of the seat W in the width direction. That is, the back of the seat W at different positions in the transport width direction by the detection holes provided on the support surface F separated in the transport width direction, the tubes communicating with the detection holes, and the pressure sensor connected to each tube. The pressure distribution can be measured.

Here, the air turn bar 2 will be described in more detail. FIG. 2 shows a detailed configuration of the air turn bar 2, and is a cross-sectional view of a main part showing the configuration of a portion in the vicinity of the detection hole 2a. The air turn bar 2 is provided with a semicircular annular porous body 2e having the same shape as the semicircular surface and a predetermined thickness on the semicircular surface of the air chamber 2d having a substantially semicircular columnar shape. That is, the exposed surface of the porous body 2e is the support surface F, and the back surface thereof faces the air chamber. The detection hole 2a includes a through hole H extending from the support surface F of the porous body 2e and extending to an opening on the back surface of the porous body 2e facing the air chamber 2d. Further, the air chamber 2d is provided with an opening facing the opening of the through hole of the porous body 2e. Further, an opening is similarly provided on the back surface 2f of the air chamber 2d. In the present embodiment, the opening of the support surface F, the opening of the back surface of the porous body 2e, the opening of the air chamber 2d facing the opening of the back surface of the porous body 2e, and the opening of the back surface 2f of the air chamber 2d are one. It is arranged on one straight line. That is, a through hole H is formed by connecting the support surface on the surface of the porous body 2c and the back surface 2f of the air chamber-2d.

As shown in the figure, a tubular member 6 (cylindrical body) is fitted in the through hole H. The tubular member 6 includes a first pipe portion 6a (shielding wall), a second pipe portion 6b (mounting portion), and a flange portion 6c. That is, the first pipe portion 6a extends from the flange surface of the flange portion of the tubular member 6, and the second pipe portion 6b (mounting portion) extends from the back surface side of the flange surface on which the first pipe portion 6a extends. .. The flange portion is provided with a through hole for communicating the first pipe portion 6a (shielding wall) and the second pipe portion 6b (mounting portion). The first pipe portion 6a is a straight pipe portion fitted into the through hole H. That is, it extends from the opening surface of the back surface 2f of the air chamber-2d to the opening surface of the support surface F. The first pipe portion 6a has a pipe length substantially the same as the length of the through hole H. That is, the first tube portion 6a extends to the opening surface of the detection hole 2a. The first pipe portion 6a is a portion that functions as a shielding wall against floating air.

The second pipe portion 6b is a straight pipe portion provided coaxially and on the opposite side of the first pipe portion 6a, and the connecting tube 5a is fitted and sealed. The tube 5a of the present embodiment is fitted so that its inner peripheral surface is in contact with the outer peripheral surface of the second pipe portion 6b. The flange portion 6c is a disc-shaped protruding portion located between the first pipe portion 6a and the second pipe portion 6b and projecting in a disc shape in the radial direction of the first pipe portion 6a and the second pipe portion 6b. ..

In such a tubular member 6, the through holes of the air chamber 2d and the porous body 2e are provided so that the tip of the first pipe portion 6a is flush with the support surface F of the air turn bar 2 which is the surface of the porous body 2e. It is fitted to H. That is, when the first pipe portion 6a is fitted into the through hole H, the outer peripheral portion of the flange portion 6c comes into contact with the back surface 2f of the air chamber 2d (the back surface side of the porous body 2e), so that the first pipe portion 6a The fitting length with respect to the through hole H is regulated. In the present embodiment, the flange surface of the flange portion 6c is in contact with the porous body 2e. However, the present invention is not limited to this, and any member extending from the porous body 2e (that is, a series of members assembled without interposing the porous body and the movable part) can be referred to as the porous body 2e. There is almost no change in the relative positional relationship, and the flange portion 6c can be attached. In particular, when the flange surface faces the support surface, the mountability is good.

The air chamber 2d is connected to the floating air supply unit 3 by a connector (not shown), and the floating air (compressed air) is supplied from the floating air supply unit 3. Further, a large number of holes (supply holes) are formed on the surface 2g of the air chamber 2d, that is, the contact surface with the porous body 2e. The air chamber 2d supplies the levitation air supplied from the levitation air supply unit 3 to the back surface of the porous body 2e through the supply holes.

The porous body 2e is a semicircular annular member made of a material in which innumerable communication holes are uniformly formed. That is, the porous body 2e has innumerable communication holes connecting the back surface and the surface surface (injection surface F). Therefore, the levitation air supplied from the air chamber 2d to the back surface of the porous body 2e is ejected from the surface (injection surface F) toward the sheet W via the communication holes of the porous body 2e.

In the tension detection device configured in this way, the floating air (fluid) injected from the surface (injection surface F) of the porous body 2e toward the sheet W (object to be detected) is formed on the porous body 2e 3 The levitation pressure of the sheet W is detected by taking in from the two detection holes 2a, 2b, 2c. Further, this tension detection device and levitation device outputs the levitation pressure of the seat W to the outside as a tension detection signal indicating the tension acting on the seat W.

Next, the operation of such a tension detection device (levitation device) will be described in detail.

In this tension detection device, the levitation air supply unit 3 supplies levitation air to the air turn bar 2 to levitate the seat W from the support surface F of the air turn bar 2. Then, the seat W passes through the air turn bar 2 in this floating state, that is, in a non-contact state, and travels from the guide roller 1A toward the guide roller 1B.

The levitation pressure detector 4 individually detects levitation pressures at three locations in the width direction of the seat W, that is, near the left end, near the center, and near the right end of the seat W.

As shown in FIG. 2, the levitation air is injected from the support surface F, which is the surface of the porous body 2e of the air turn bar 2, toward one side of the sheet W, and a pressure is applied between the support surface F and one side of the sheet W. A layer of air with a distribution is formed. The pressure distribution of the air layer is taken in from the detection holes 2a, 2b, 2c facing the sheet W, and is measured by the pressure sensors 4a, 4b, 4c via the connection tubes 5a, 5b, 5c. As a result, the pressure values at different positions in the transport width direction are measured, and the back pressure distribution in the transport width direction can be measured.

Here, since the three detection holes 2a, 2b, and 2c are all configured by fitting the tubular member 6 into the through holes H formed in the air chamber 2d and the porous body 2e, the porous body Floating air does not directly flow into the detection chambers 2a, 2b, and 2c from 2e. On the other hand, the surface of the through hole H of the porous body 2e is exposed to the innumerable communication holes inherent in the porous body 2e. Therefore, for example, when the tubular member 6 is omitted, the floating air is released. , It will flow directly into the through hole H of the porous body 2e through the communication hole. Since the levitation air directly flowing into the through hole H does not reflect the levitation pressure of the seat W, the pressure sensors 4a, 4b, and 4c cannot detect the normal levitation pressure.

That is, according to the tension detection device (levitation device) according to the present embodiment, since each of the detection holes 2a, 2b, and 2c is provided with the tubular member 6, it flows out from the circumferential side surface of the through hole of the porous body 2e. It is possible to prevent the levitation air from directly flowing into the detection holes 2a, 2b, 2c. Then, according to the tension detection device (levitation device) according to the present embodiment, it is possible to detect the levitation pressure more accurately with each of the pressure sensors 4a, 4b, 4c.

Further, since the tubular member 6 in the present embodiment includes a flange portion 6c instead of a simple tubular member, the first tube portion is formed when the tubular member 6 is fitted into the through hole H of the air chamber 2d and the porous body 2e. The tip of 6a is flush with the injection surface F of the porous body 2e. That is, according to the tension detection device (levitation device) according to the present embodiment, it is possible to prevent the tip of the first pipe portion 6a from protruding from the injection surface F of the porous body 2e and coming into contact with the sheet W. is there.

Further, since the tubular member 6 in the present embodiment includes the flange portion 6c, when the connecting tubes 5a, 5b, 5c are connected to the second pipe portion 6b of the detection holes 2a, 2b, 2c, the flange portion is provided. The surface of the second pipe portion 6b in 6c functions as a flat receiving surface. Therefore, according to the tension detection device (levitation device) according to the present embodiment, it is possible to reliably connect the connection tubes 5a, 5b, 5c to the tubular member 6.

In this tension detection device, the levitation pressure of the seat W detected by each pressure sensor 4a, 4b, 4c is an external detection value of the tension acting on the seat W near the left end, the center, and the right end of the seat W. Is output to. That is, the levitation pressure of the sheet W is a physical quantity that changes depending on the tension acting on the sheet W. According to the tension detection device (levitation device) according to the present embodiment, it is possible to detect the tension acting on the sheet W near the left end, the center, and the right end of the sheet W, that is, the tension distribution in the width direction of the sheet W. Is.

The present invention is not limited to the above embodiment, and for example, the following modifications can be considered.
(1) In the above embodiment, the tubular member 6 is fitted into the through hole H to prevent the levitation air from directly flowing into the detection holes 2a, 2b, 2c, but the present invention is not limited to this. For example, instead of the tubular member 6, a coating film that functions as a shielding wall may be formed on the surface of the through hole H. As this film, a metal film formed on the surface of the through hole H by plating or the like or a resin film formed on the surface of the through hole H by painting or the like can be considered.

(2) In the above embodiment, the case where the levitation device according to the present invention is applied to the tension detection device has been described, but the present invention is not limited to this. The levitation device according to the present invention can be applied to various applications other than detecting the tension acting on the seat W. That is, the pair of guide rollers 1A and 1B in the above embodiment are not essential constituent requirements but selective constituent requirements provided as needed.

(3) In the above embodiment, floating air, that is, air is used as a fluid for injecting air from the surface (injection surface F) of the porous body 2e toward the sheet W (object to be detected), but the present invention is not limited thereto. .. A predetermined inert gas such as nitrogen gas may be used instead of air.

1A, 1B Guide roller 2 Air turn bar 2a, 2b, 2c Detection hole 2d Air chamber 2e Porous body 2f Back surface 2g Surface 3 Floating air supply unit 4 Floating pressure detector 4a, 4b, 4c Pressure sensor 5a, 5b, 5c Connection tube 6 Tubular member (cylindrical body)
6a 1st pipe (shielding wall)
6b 2nd pipe part (mounting part)
6c Flange F Support surface (semi-cylindrical surface)
H through hole W sheet

Claims (6)

A porous body with a support surface and
A gas supply device that supplies floating gas to the porous body and
With the opening provided on the support surface,
Through holes extending from the opening and formed in the porous body,
A tubular body that is at least partially surrounded by the inner peripheral surface of the through hole and extends to the opening surface of the opening.
A pressure sensor that communicates with the tubular body is provided .
Said tubular body, said porous body Ru levitation apparatus includes a mounting portion whose tip is mounted in the connection tube to the back side of the. The tubular body has a flange surface and
The levitation device according to claim 1, wherein the flange surface is in contact with the porous body or a member extending from the porous body. A levitation device that detects the levitation pressure of the object to be detected by taking in the fluid jetted from the surface of the porous body toward the object to be detected through the detection holes formed in the porous body.
The detection hole comprises a shielding wall against the fluid .
The shielding wall is formed by a tubular member that fits into the through hole of the porous body.
It said tubular member is floating device Ru provided with a mounting portion front end of the connecting tube to the back side of the porous body is mounted. The levitation device according to claim 3, wherein the tubular member includes a flange portion that abuts on the back surface side of the porous body . The levitation device according to claim 3 , wherein the shielding wall is formed by a coating film formed in a through hole of the porous body . A tension detecting device comprising the levitation device according to any one of claims 1 to 5, wherein the levitation pressure is detected as a tension acting on the object to be detected.

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