JPH11293581A - Web widening apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a web widening apparatus reducing the slipping between a web and a sleeve accompanying the enlargement and speed-up of a machine, and capable of ensuring the effects of widening and smoothing down of the web. SOLUTION: This web widening apparatus comprises a curved fixed axis metal 2, and a sleeve 3, which is supported on the fixed axis metal 2 and freely rotatable around the fixed axis 2; and the sleeve 3 is made to touch with a travelling web 20 to widen the width of the web 20. This web opening apparatus is provided with a suctioning exhausting unit, a suctioning hole 10 communicating te suctioning exhausting unit to the inside of the sleeve 3 is formed on the fixed axis metal 2, and plural air holes 12 for communication between the inside and outside of the sleeve 3 are formed on the entire peripheral surface of the sleeve 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web spreading apparatus suitable for widening or wrinkling a web such as a wire or felt in a paper machine, a printing paper in a rotary printing machine, and a woven fabric in a textile machine.

[0002]

2. Description of the Related Art Conventionally, a machine for handling a thin flexible band generally called a web, such as a wire or felt in a paper machine, a printing paper in a rotary printing machine, a woven fabric in a textile machine, and the like, has a width of the web. A web spreading device for spreading a wrinkle or stretching wrinkles is used.

As shown in FIG. 6, the conventional web spreading device is configured such that a sleeve 23 is provided on the outer periphery of a curved fixed core 22 having both ends supported by bearings 21a and 21b. The sleeve 23 is rotatable about the fixed core 22, and rotates in the running direction of the web 20 by contacting the running web 20. At this time, the web 20 receives a contact pressure from the curved sleeve 23. This contact pressure is the strongest at the center in the width direction of the web 20 and gradually decreases toward the edge.
A tension acts to expand the web 20 in the width direction (the directions of arrows a and a 'in the figure), and the web 20 is widened and wrinkled by this tension.

FIG. 7 is a sectional view (longitudinal section) of the conventional web spreading device in the axial direction, and FIG. 8 is a cross-sectional view taken along the line AA of FIG. FIG. As shown in FIGS. 7 and 8, a plurality of bearings 24 are arranged at appropriate intervals on the outer periphery of the curved fixed core 22, and the outer ring thereof has a split sleeve at a ratio of one to two bearings 24. 25 are fitted. An appropriate gap is provided between the adjacent split sleeves 25, and is freely rotatable around the curved fixed core 22 as an axis. A sleeve 23 made of a flexible material such as rubber is in close contact with the outer peripheral surface of the split sleeve 25, and rotates around the fixed core 22 integrally with the split sleeve 25. It has become.

[0005] The web spreading device having the above-described configuration is an essential device in the above-described machine for handling webs such as a paper machine, a rotary printing machine, and a textile machine.

[0006]

However, with the recent increase in the size and speed of the mechanical device, the following problems have become apparent. That is, as shown in FIG. 9, a running web 20 and a sleeve 23 rotating in contact with the web 20.
A wake air 27 is generated on each surface of the airbag. At the inlet side of the web spreading device, the wake air 27 generated on the surface of each of the web 20 and the sleeve 23 approaches the contact point P between the web 20 and the sleeve 23, so that the wake air 27 is so-called “wedge action” of the fluid. The internal pressure gradually increases, and the internal pressure becomes maximum near point P.

The internal pressure of the wake air 27 acts as a force opposing the force of the web 20 pressing the sleeve 23 by the tension in the width direction. As a result, the coefficient of contact friction between the web 20 and the sleeve 23 is reduced, causing slippage between the two, and the effect of spreading the web 20 in the width direction and the effect of spreading the wrinkles are significantly reduced. The reduction in this effect becomes more pronounced as the size and speed of the mechanical device increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and reduces slip between a web and a sleeve due to increase in size and speed of a mechanical device, and secures a web widening effect or a wrinkle elongation effect. It is an object of the present invention to provide a web spreading device which can be used.

[0009]

According to a first aspect of the present invention, there is provided a web spreading apparatus according to the present invention, comprising: a curved fixed core; In a web spreading device having a rotatable sleeve at the center and making the sleeve contact with a running web to widen the web, a suction and exhaust device is provided, and the fixed cored bar is provided with the suction and exhaust device and the suction and exhaust device. A suction port communicating with the inside of the sleeve is provided, and a plurality of air holes communicating between the inside and the outside of the sleeve are provided on the entire peripheral surface of the sleeve.

According to a second aspect of the present invention, there is provided the web spreading apparatus according to the first aspect,
A partition plate for partitioning a space inside the sleeve is provided on the fixed core bar, and the suction port communicates only with the space partitioned by the partition plate.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 show a web spreading apparatus as an embodiment of the present invention. First, the overall configuration of the web spreading device will be described. As shown in FIG. 1, the present web spreading device comprises a sleeve 3 on the outer periphery of a curved fixed core 2 having both ends supported by bearings 1a and 1b. The sleeve 3 is freely rotatable about the fixed core 2, and rotates in the running direction of the web 20 in contact with the running web 20. The fixed core 2 has a hollow structure as described later. One end of the pipe 4 is connected to one shaft end 2a, and the other shaft end 2b is sealed so as not to leak air. The other end of the pipe 4 is connected to the suction side of an air blower (suction / exhaust device) 5.

Next, the internal structure of the present web spreading device will be described in detail. FIG. 2 is an axial sectional view (longitudinal sectional view) of the present web spreading device, and FIG. FIG. As shown in FIGS. 2 and 3, a plurality of bearings 6 are arranged at appropriate intervals on the outer periphery of the curved fixed core 2, and one of the two bearings 6 is provided on the outer ring thereof.
The cells 7 are fitted in two ratios. An appropriate gap is provided between the adjacent cells 7 so that the cells 7 can freely rotate about the curved fixed core 2 as an axis without interfering with each other. A sleeve 3 made of a flexible material such as rubber is in close contact with the outer peripheral surface of the cell 7, and is integrally formed with the cell 7 while maintaining a curved shape. , And freely rotates through a bearing 6.

A plurality of sets of partition plates 9a, 9b and 19a, 19b are fixedly provided on the outer peripheral surface of the fixed cored bar 2, respectively. The partition plates 9a and 9b are disposed between two bearings 6 into which the same cell 7 is fitted, and
9 a and 19 b are arranged between two bearings 6 of the adjacent cell 7. These partition plates 9a, 9b and 1
9a and 19b are fixed to the fixed core 2 at a predetermined angle with respect to each other.

The partition plates 9a, 9b and 19a, 19
The installation angle of b is arbitrary, and can be set according to the contact angle between the web 20 and the sleeve 3. For example, FIG. 3 and FIG. 4 are cross-sectional views (cross-sectional views taken along the line AA in FIG. 2) of portions where the partition plates 9a and 9b are disposed. As shown in FIG. 9b has an angle of about 90 degrees, and a partition plate 9a is provided at a position where the running web 20 contacts the sleeve 3, and a partition plate 9b is provided at a position where the web 20 is separated from the sleeve 3.

Similarly to the partition plates 9a and 9b, the partition plates 19a and 19b have an angle of about 90 degrees here, and the partition plate 19a is installed at a position where the running web 20 contacts the sleeve 3. And web 2
The partition plate 19b is installed at a position where the reference numeral 0 separates from the sleeve 3. A minute gap is maintained between the tops of the partition plates 9a and 9b and the cell 7 and between the tops of the partition plates 19a and 19b and the sleeve 3, respectively. , These partition plates 9a,
9b or fixed core 2 without contacting 19a, 19b
You can rotate around.

A pipe 8 for sucking air is provided at the center of the shaft of the fixed core 2. This pipe 8 is a shaft end 2
At a, it is connected to the pipe 4 and further connected to the air blower 5 via the pipe 4. Further, a plurality of suction ports 10 are formed in the pipeline 8, and each of the suction ports 10 is provided with two partition plates 9 a and 9 b and a cell 7.
13a, or the space 1 partitioned by the two partition plates 19a, 19b and the sleeve 3.
3b. Further, a large number of air holes 11 and 12 that connect the inside and the outside of the cell 7 or the sleeve 3 are formed in the entire peripheral surface of each of the cell 7 and the sleeve 3.

Since the web spreading device as one embodiment of the present invention is configured as described above, the sleeve 3 is rotated to move the web 20 in the width direction (arrows a and a 'in FIG. 1).
When the air blower 5 is driven when the web 20 is widened and wrinkled with tension to expand in the direction (direction), the space 13a, 13b in each of the spaces 13a, 13b partitioned by the two partition plates 9a, 9b or 19a, 19b. The air is supplied from pipe 4, pipe 8,
The air is blown into the air blower 5 through the suction port 10. Accordingly, the air holes 1 of the cell 7 communicating with the spaces 13a and 13b are formed.
Air outside the sleeve 3 is sucked from the air holes 12 of the sleeve 1 and the sleeve 3.

For this reason, when the web 20 is run while being in contact with the sleeve 3, the following effects can be obtained. That is, as shown in FIG. 4, when the web 20 travels while contacting the sleeve 3, when the web 20 runs,
Part), wake air 27a is generated along the running direction of the web 20 and the rotation direction of the sleeve 3. This wake air 2
7 a is compressed between the web 20 and the sleeve 3 according to the running of the web 20 and the rotation of the sleeve 3.

However, as described above, since the air outside the sleeve 3 is sucked from the air holes 11 and 12 communicating with the spaces 13a and 13b in the sleeve 3 by driving the air blower 5, the wake The air 27a is also the air hole 11,
The air is sucked into the spaces 13a and 13b via the line 12. Then, the air is exhausted from the suction port 10 of the fixed core 2 to the pipe 8 by the suction action of the air blower 5.

FIG. 5 shows the rotation angle of the sleeve 3 on the horizontal axis and the internal pressure of air generated between the web 20 and the outer peripheral surface of the sleeve 3 on the vertical axis. The state of the change of the internal pressure in the web spreading device is shown by a dashed line, and the state of the internal pressure in the web spreading device is shown by a solid line. As shown in FIG. 5, the wake air 27a is supplied from the air holes 11 and 12 to the sleeve 3.
As a result, the rise in the internal pressure between the web 20 and the outer peripheral surface of the sleeve 3 due to the generation of the wake air 27a is significantly reduced as compared with the rise in the internal pressure in the conventional web spreading device. . In particular, the internal pressure at the bonding point P between the web 20 and the sleeve 3 is greatly reduced, and the web 20 is urged by the tension in the width direction.
Can be effectively pressed.

As a result, the coefficient of contact friction between the web 20 and the outer peripheral surface of the sleeve 3 is increased, and the adhesion between the two is improved, and mechanical devices such as a paper machine, a rotary printing machine, and a textile machine that handle the web 20 are large. Even if the speed is increased, the slip between the web 20 and the outer peripheral surface of the sleeve 3 is less likely to occur, and the effect of widening or wrinkling the web 20 is improved. On the other hand, on the apparatus outlet side (section B), wake air 27b is generated as the web 20 runs and the sleeve 3 rotates. The wake air 27b flows out along the running direction of the web 20 and the rotation direction of the sleeve 3, so that the air density at the portion where the web 20 separates from the outer peripheral surface of the sleeve 3 is reduced, and as a result, the apparatus exit side (B 5), a negative air pressure is generated as shown in FIG.

In particular, in the present web spreading apparatus, the wake air 27Aa on the apparatus entrance side (A section) is sucked into the sleeve 3 from the air holes 11 and 12 located above the spaces 13a and 13b. Air 27a is at the device exit side (part B)
Is rarely supplied. For this reason, the air pressure on the apparatus outlet side (part B) is greatly reduced as compared with the conventional web spreading apparatus. Also, on the device outlet side (portion B), since the external air is sucked into the sleeve 3 from the air holes 11 and 12 in the portion located above the spaces 13a and 13b, the device outlet side (portion B) The air pressure in ()) decreases.

Due to the decrease in the air pressure on the outlet side (part B) of the apparatus, the pressure on the side of the web 20 which does not contact the sleeve 3 becomes relatively high, and the web 20 is pressed against the sleeve 3 by this pressure difference. . For this reason, the adhesion between the web 20 and the sleeve 3 is further improved, the possibility of slippage between the web 20 and the outer peripheral surface of the sleeve 3 is further reduced, and the widening effect and the wrinkle smoothing effect are further improved.

Thus, according to the present web spreading device,
The wake air 27a generated on the apparatus entrance side (part A) with the traveling of the web 20 and the rotation of the sleeve 3 can be sucked into the sleeve 3, so that the web 20 and the sleeve 3 caused by the wake air 27a It is possible to reduce an increase in internal pressure between the webs, thereby suppressing the slippage between the web 20 and the sleeve 3, and has an advantage that a high widening effect and a high wrinkling effect can be obtained.

Also, since the suction between the web 20 and the sleeve 3 is improved by the suction of the wake air 27a, the decrease in the air pressure at the apparatus outlet side (part B) due to the wake air 27b is further increased, and further. Since the outside air is sucked into the sleeve 3 also at the apparatus outlet side (part B), the adhesiveness between the web 20 and the sleeve 3 is further improved, and a higher widening effect and a higher wrinkling effect are obtained. There are advantages.

Further, in the present web spreading device, the fixed cored bar 2 is provided with the partition plates 9a, 9b and 19a, 19b to form the spaces 13a, 13b in the sleeve 3, and only the air in these spaces 13a, 13b is formed. , It is possible to efficiently suck only the air at the portion where the web 20 and the sleeve 3 are in contact with each other.
There is an advantage that it is possible to reduce the energy consumption due to the air suction in the above.

The web spreading device of the present invention is not limited to the above embodiment, but can be variously modified and implemented.

[0028]

As described above in detail, according to the web spreading apparatus of the first aspect of the present invention, the wake air generated at the apparatus inlet side due to the running of the web and the rotation of the sleeve is sucked into the sleeve. As a result, it is possible to reduce an increase in internal pressure between the web and the sleeve caused by the wake air, thereby suppressing the slip between the web and the sleeve and obtaining a high widening effect and a wrinkle elongation effect. There are advantages.

Further, the suction of the wake air on the inlet side improves the adhesion between the web and the sleeve, so that the air pressure on the outlet side of the apparatus is more greatly reduced. Since the external air is sucked into the inside, the adhesion between the web and the sleeve is further improved, and there is an advantage that a higher widening effect and a higher wrinkling effect can be obtained.

According to the web spreading apparatus of the present invention, a partition plate is provided on the fixed core bar to partition the space inside the sleeve, and only the air in the space partitioned by the partition plate is sucked. Because it is possible to efficiently suck only the air where the web and the sleeve come into contact,
There is an advantage that it is possible to reduce the energy consumption associated with the suction of air in the suction and exhaust device.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a web spreading device as one embodiment of the present invention.

FIG. 2 is an axial cross-sectional view (longitudinal cross-sectional view) illustrating a main configuration of the web spreading device as one embodiment of the present invention.

FIG. 3 is a cross-sectional view (transverse cross-sectional view) taken along line AA of FIG. 2 showing a main configuration of the web spreading device as one embodiment of the present invention.

FIG. 4 is a diagram for explaining an operation of the web spreading device as one embodiment of the present invention during operation.

FIG. 5 is a diagram showing a change in internal pressure generated between a web and a sleeve according to one embodiment of the present invention.

FIG. 6 is a schematic diagram showing the entire configuration of a conventional web spreading device.

FIG. 7 is an axial cross-sectional view (longitudinal cross-sectional view) illustrating a main part configuration of a conventional web spreading device.

FIG. 8 is a cross-sectional view (transverse cross-sectional view) taken along the line AA of FIG. 7, showing a main configuration of the conventional web spreading device.

FIG. 9 is a diagram for explaining the operation of the conventional web spreading device during operation.

[Explanation of symbols]

 1a, 1b Bearing 2 Fixed core 2a, 2b Shaft end of fixed core 3 Sleeve 4 Piping 5 Air blower (suction / exhaust device) 6 Bearing 7 Cell 8 Pipe 9a, 9b, 19a, 19b Partition plate 10 Suction port 11, 12 Air Hole 20 Web 21 Bearing 22 Fixed Core 23 Sleeve 24 Bearing 25 Split Sleeve 27, 27a, 27b Wake Air

Claims (2)

[Claims] A fixed core and a sleeve rotatably supported by the fixed core and rotatable about the fixed core. The sleeve is brought into contact with a running web to increase the width of the web. In the web spreading device to be performed, a suction / exhaust device is provided, and the fixed core is provided with a suction port for communicating the suction / exhaust device with the inside of the sleeve. A web spreading device comprising a plurality of air holes communicating with the outside. 2. The fixed core bar is provided with a partition plate for partitioning a space inside the sleeve, and the suction port communicates only with the space partitioned by the partition plate. Item 2. A web spreading device according to Item 1.