JP2788941B2 - Strip tensioning device - Google Patents

Description

The present invention relates to a slitter for cutting a wide strip such as a sheet metal coil into a plurality of strips along a longitudinal direction of the strip. The present invention relates to a strip winding tension applying device that adjusts a tension imbalance that occurs when winding each slit strip later and applies an even winding tension.

[Conventional technology]

Usually, the thickness of the strip in the width direction is thick at the center and thin on both sides. If this is cut in parallel along the longitudinal direction of the strip and wound on a common winding drum, a difference in the winding diameter causes a difference in the winding speed between the slit strips.

As a result, the winding tension of each slit strip wound on the winding drum becomes unbalanced, and the slit strips on both ends wound on the winding drum become softer than those wound in the center. When the slit strip is pulled out from the winding drum, the slit strip becomes telescopic or squashed into an ellipse, which makes it impossible to rewind or transport.

For this reason, in equipment that cuts and divides a wide strip such as a sheet metal coil into multiple slit strips, a device that applies winding tension during supply to the slit strip winding device is provided. After a predetermined winding tension is applied to the slit strip strip by this device, it is wound by a common winding drum.

Conventionally, as the tension applying device which functions without damaging the surface of the slit strip, Japanese Patent Publication No. Sho 51-35458 and Japanese Patent Application Laid-Open No. Sho 56-136748 are known.

The device disclosed in JP-B-51-35458 discloses a device in which, before winding a cut multi-strip strip, it is brought into contact with an adjustment roll having an elastic body surface in which a grid-like slit is engraved, and A winding tension is generated by an applied brake so that the tension fluctuation of each strip can be automatically adjusted.

The apparatus disclosed in JP-A-56-136748 uses an endless belt, and a multi-slit slit band cut between opposed outer surfaces of endless belts arranged vertically. Through the plate, the inner surface of the endless belt is pressed with a friction piece, the upper and lower endless belts are pressed against the front and back surfaces of the slit band plate and pressed, and the endless belt is rotated integrally with the moving slit band plate Winding tension can be applied to each slit strip by frictional force caused by slippage between the friction piece and the inner surface of the endless belt.

[Problems to be solved by the invention]

However, in the case of using the apparatus shown in JP-B-51-35458, the generation of scratches on the surface of the slit band and the attachment of the pattern by pressing are further dependent on the material of the slit band and the type of surface treatment. Occurs in ultra-thin sheet material and impairs product quality.

In particular, when winding with a weak tension like a slit strip made of a soft material, when the pressing force between the slit strip and the adjustment roll is not sufficient to prevent the occurrence of imprint, or when these contact surfaces are Often occurs when it is dirty.

On the other hand, in a tension applying device using an endless belt, the endless belt and the slit band plate move integrally, and the inner surface of the endless belt is braked and wound on the slit band plate via the endless belt. Since the tension is applied, there is an advantage that it is possible to prevent the occurrence of scratches on the surface of the slit strip.

In the tension applying device using this endless belt,
Since the inner surface of the endless belt must cause slippage and the outer surface of the endless belt must move integrally with the slit strip without causing slippage,
The coefficient of sliding friction of the inner surface of the endless belt must always be smaller than the outer surface. However, when fats and oils are attached to the surface of the slit strip, the sliding friction coefficient between the slit strip and the outer surface becomes smaller than that of the inner surface, and slip occurs between the slit strip and the outer surface. In some cases, the surface of the slit strip was flawed.

Also, in order to prevent this, it is difficult to always adjust the inner surface and the outer surface of the endless belt by using only the materials of the inner surface and to keep the inner surface in a state that is more slippery than the outer surface.

In view of the above problems, the present invention has been made to solve the problems, and an object thereof is to provide a pressing mechanism that presses the inner surface of the endless belt with an air pressure body. The endless belt is constructed so that the pressure applied to the outer surface of the endless belt by pressing against the slit band plate is reduced to zero by using the air pressure member of the pressing mechanism. The sliding friction between the slit strip and the outer surface is controlled by using the sliding tension applying body of the pressing mechanism to generate the predetermined winding tension. To be larger than the inner surface,
It is an object of the present invention to provide a winding tension applying device for a strip which can prevent slippage between the slit strip and the outer surface of the endless belt.

[Means for solving the problem]

In order to achieve the above object, the present invention is to arrange a plurality of endless belts held in a freely circulating manner in the width direction so as to face each other up and down, and to be provided on the inner surface side of each of the upper and lower endless belts. The upper and lower endless belts are pressed and pressed by the arranged pressing mechanism against the slit strip passed between the opposed outer surfaces of the upper and lower endless belts, and the endless belt is moved by pressing with the slit strip. A tension applying device for applying a tension to each slit strip by a sliding friction force between the pressing mechanism and the inner surface of the endless belt, wherein the pressing mechanism presses the inner surface of each endless belt. The press mechanism injects compressed air to the inner surface of the endless belt to press the inner surface of the endless belt, and the outer side of the endless belt that becomes the back side of the inner surface And air pressure body for crimping presses the surface to slit strip, made of those composed of a take-up tensioning member.

[Action]

The present invention having the above configuration operates as follows.

That is, by configuring the pressing mechanism for pressing the inner surface of the endless belt with an air pressure body and a winding tension applying body, pressing and pressing the outer surface of the endless belt against the slit band plate uses the air pressure body of the pressing mechanism. It works so that the sliding friction resistance is zero, and the sliding friction with the inner surface of the endless belt acts to generate a predetermined winding tension using the winding tension applying body of the pressing mechanism. I do.

Each of the endless belts independently circulates independently of each other without slippage due to frictional engagement with each of the moving slit strips, and independently circulates. The frictional force caused by the sliding between the body and the inner surface of the endless belt acts to apply an equal tension to each slit strip without damaging the slit strip surface.

〔Example〕

Hereinafter, the present invention will be described more specifically based on embodiments shown in the drawings.

 Here, FIG. 1 is a front view of the tension applying device.

In the figure, a tension applying device 1 is a device for applying a predetermined winding tension to a slit strip 2, and the tension applying device 1 is a moving passage of the slit strip 2 in front of a winding drum of a slit strip not shown. It is arranged in the middle of. The tension applying device 1 includes an endless belt 3 held vertically circulatingly and circulating freely, and an inner surface of the endless belt 3.
It mainly comprises a pressing mechanism 4 for pressing 3a.

The endless belts 3 are arranged so as to circulate freely in the moving direction of the slit band plate 2, and are arranged in parallel in the width direction, that is, in the direction perpendicular to the moving direction of the slit band plate 2. It is arranged facing. Each of the endless belts 3 arranged vertically is stretched between a pair of pulleys 5,5.

The outer surface 3b of the endless belt 3 is
And a function of moving the slit strip 2 integrally. On the other hand, the inner surface 3a of the endless belt 3 has a function of generating tension in the slit strip 2 by frictional force caused by sliding with the pressing mechanism 4.

Due to such a difference in functions, the outer surface 3b of the endless belt 3 is generally formed of a material having a higher friction coefficient than the inner surface 3a. For example, the outer surface 3b is formed of a soft urethane resin or rubber, and the inner surface 3a is formed of hard nylon, a copper plate, or the like.

Each of the pulleys 5 is attached to a front shaft 8 and a rear shaft 9 which are laterally provided on the upper bearing bracket 6 and the lower bearing bracket 7 so as to be freely rotatable. That is, each pulley 5 is supported so that it can rotate independently in the moving direction of the slit strip 2,
Thereby, each endless belt 3 can independently circulate in the moving direction of the slit strip 2.

Further, no drive source is attached to each pulley 5 rotatably supported on the front shaft 8 and the rear shaft 9, and the endless belt 3
Cannot circulate by itself other than circulating by frictional engagement with the moving slit strip 2. That is, the endless belt 3 does not circulate unless it comes into contact with the slit strip 2.

An upper bearing bracket 6 to which the upper endless belt 3 is attached via a pulley 5 is linked to a hydraulic cylinder 11 above it via a connecting rod 10 and can be moved up and down by this hydraulic cylinder 11. ing.

The lower bearing bracket 7 to which the lower endless belt 3 is attached via a pulley 5 is fixed to a stand 12. The upper bearing bracket 6 and the lower bearing bracket 7 include upper and lower endless belts 3.
The pressing mechanism 4 is attached at a position facing each other.

The hydraulic cylinder 11 is fixed to an upper portion of the stand 12, and the upper and lower endless belts 3 are held by the stand 12 via upper and lower bearing brackets 6, 7, and the like.

FIG. 2 is a sectional side view of a main bracket of the tension applying device, and FIG. 3 is a sectional view taken along the line AA of FIG.

Each of the pressing mechanisms 4 is attached to the upper bearing bracket 6 and the lower bearing bracket 7 at positions facing each other with the upper and lower endless belts 3 interposed therebetween, as described above.
Each pressing mechanism 4 is an inner surface 3a of each of the upper and lower endless belts 3.
Located on the side. The pressing mechanism 4 is an endless belt 3
The inner surface 3a of the endless belt 3 is pressed against the outer surface 3b of the endless belt 3, which is the back side of the inner surface 3a, by pressing against the slit band plate 2, and the moving slit band plate 2 and the endless belt 3 are integrated. In addition to having a function, the endless belt 3 that circulates integrally with the moving slit strip 2 is braked to apply a predetermined winding tension to the slit strip 2 via the endless belt 3. .

The pressing mechanism 4 having such a function is provided by the air pressure member 14.
And a winding tension applying body 15.

Among them, the air pressure member 14 presses the outer surface 3b of the endless belt 3 against the slit band plate 2 and presses and presses the same, and the moving slit band plate 2 and the endless belt 3 are integrated with each other in the function of the pressing mechanism 4 described above. Perform the function of

The air pressure body 14 includes a compressed air supply source 14a, a pressure regulator 14
b, a pipe 14c serving as a compressed air flow path, a pipe connection port 14d, a compressed air chamber 14e, a compressed air injection port 14f, and the like.

The compressed air chamber 14e of the air pressure member 14 is formed in a hollow shape having a certain width, length and thickness, and its longitudinal direction is perpendicular to the moving direction of the slit strip 2 and the endless belt 3e.
Are divided in the width direction. That is, the compressed air chamber
Reference numeral 14e corresponds to each of the endless belts 3 arranged side by side in the width direction and is provided separately in the width direction of the endless belt 3. The compressed air chamber 14e has a hollow interior in which compressed air is sealed, and is made of a sealing material that does not cause leakage of air inside.

Compressed air injection port 1 formed on one side of compressed air chamber 14e
4f is in direct contact with the inner surface 3a of the endless belt 3. The opening width of each compressed air injection port 14f is formed smaller than the width of the endless belt 3, and the opening of the compressed air injection port 14f is completely closed by the endless belt 3, and the compressed air injection port 14f is injected from the compressed air injection port 14f. All of the compressed air acts on the inner surface 3a of the endless belt 3 so that it does not leak.

Compressed air is produced by a compressed air supply 14a and a pressure regulator 1
4b, the pipe 14c and the pipe connection port 14d, enter the compressed air chamber 14e, and the compressed air flowing into the compressed air chamber 14e is jetted from the compressed air jet port 14f to the inner surface 3a of the endless belt 3 and the inside of the endless belt 3 The front surface 3a is pressed, and the outer surface 3b of the endless belt 3 on the back side of the inner surface 3a is pressed against the slit strip 2 and pressed.

At this time, the sliding frictional resistance between the inner surface 3a of the endless belt 3 and the air pressure is very small, and there is no problem even if the sliding frictional resistance is considered to be zero. On the other hand, even when the surface of the slit band plate 2 is very slippery due to the attachment of oil or the like to the surface thereof, the sliding friction resistance between the slit band plate 2 and the outer surface 3b of the endless belt 3 is zero. It will not be.

For this reason, the sliding friction resistance of the inner surface 3a of the endless belt 3 can always be kept smaller than the outer surface 3b, and the endless belt 3 only slides on the inner surface 3a and does not slip on the outer surface 3b. No slippage occurs between the outer surface 3b of the endless belt 3 and the slit strip 2.

Winding tension applying member 15 constituting a part of the pressing mechanism 4
The endless belt 3 circulating integrally with the moving slit strip 2 in the function of the pressing mechanism 4 described above.
To provide a predetermined winding tension to the slit strip 2 via the endless belt 3.

The winding tension applying members 15 are provided adjacent to both sides of the compressed air chamber 14e in the moving direction of the slit strip 2. The contact piece 15a of the winding tension applying body 15 has an endless belt 3
The endless belt 3 is circulated by direct contact with the inner surface 3a of the endless belt 3 by its friction. The contact piece 15a is arranged in the width direction of the endless belt 3.

Since the slit strip 2 is integrated with the endless belt 3 by the air pressure member 14, when the circulation movement of the endless belt is braked, the slit strip 2 is also braked and the surface of the slit strip 2 is not damaged. This makes it possible to apply a predetermined winding tension to the slit strip 2.

Next, the operation of the belt-winding tension applying device based on the configuration of the above embodiment will be described.

First, the upper bearing bracket 6 is pulled up by the hydraulic cylinder 11, and the upper endless belts 3 are passed through the respective slit strips 2 in a state where a sufficient gap is provided between the upper endless belts 3 and the lower endless belts 3 to form a winding drum (not shown). After the leading end of each slit strip 2 is locked, the upper bearing bracket 6 is lowered to the stop position, and the upper and lower endless belts 3 sandwich each slit strip 2 from above and below.

In this state, the compressed air set by the pressure regulator 14b constituting a part of the air pressure member 14 is supplied from the compressed air supply source 14a to the compressed air chamber 14e via the pipe 14c and the pipe connection port 14d. The compressed air supplied to the compressed air chamber 14e is injected from the compressed air injection port 14f and presses the inner surface 3a of the endless belt 3 with uniform air pressure. Each endless belt 3 pressed by air pressure is pressed while being sandwiched from above and below the slit band plate 2, and the outer surface 3 b of each endless belt 3 is pressed against the slit band plate 2 and pressed.

Also, at this time, the contact piece 15a of the winding tension applying member 15 is pressed against and brought into contact with the inner surface 3a of each endless belt 3, so that braking works between the contact piece 15a and the inner surface 3a of the endless belt 3. I do.

In this state, the winding drum (not shown) is operated, and the slit strips 2 of each strip are wound simultaneously. In this case, the problem due to the difference in the winding speeds of the slit strips 2 does not occur because the circulating motion of the upper and lower endless belts 3 corresponding to the slit strips 2 does not interfere with each other and is performed independently. . That is, although the upper and lower endless belts 3 are stretched between the pair of pulleys 5, the respective pulleys 5 are freely rotatably attached to the front shaft 8 and the rear shaft 9, so that the circulating motion of the endless belts 3 is mutually reciprocal. This is because it is performed independently without interfering at all.

When the winding of the slit strip 2 is started, the front and back surfaces of the moving slit strip 2 and the outer surface 3b of the endless belt 3
, The upper and lower endless belts 3 circulate. At this time, the endless belts 3 circulate independently of the moving slit strips 2 independently of each other without slipping.

On the other hand, the contact piece 15a of the winding tension applying member 15 constituting the pressing mechanism 4 and the inner surface 3a of the endless belt 3
That is, the contact piece 15a pressing the inner surface 3a of the endless belt 3 circulating by frictional engagement with the moving slit body plate 2 serves as a so-called braking mechanism by frictional force due to sliding between A constant take-up tension is generated in each slit strip 2 located between the take-up drum and the tension applying device 1 which is not used.

Such a winding tension does not cause a slip between each slit strip 2 and the outer surface 3b of the endless belt 3 even when the surface of the slit strip 2 is very slippery due to oil or the like. And the slit strip 2.

This can be explained for the following reasons (see FIG. 2).

That is, the inner surface 3a of the endless belt 3 and the pressing mechanism 4
The slip between the outer surface 3b of the endless belt 3 and the slip between the outer surface 3b of the endless belt 3 and the slit strip 2 means that the inner surface 3a of the endless belt 3 and the pressing mechanism 4
Is when the average friction coefficient mu _U between the side is smaller than the average friction coefficient mu _L between the outer surface 3b and the slit strips 2 of the endless belt 3.

Therefore, in order not to cause a slip between the outer surface 3b of the endless belt 3 and the slit strip 2, it is sufficient to consider a condition of μ _U <μ _L.

Now, F: contact piece 15a and inner surface 3 of endless belt 3
Contact pressure with a p: Air pressure of the compressed air injection port 14f A: Air pressure acting area applied to the inner surface 3a of the endless belt 3 N: Total reduction force on the pressing mechanism 4 side (= F + p · A) μ _U : Endless belt Average friction coefficient μ _L between the inner surface 3a of the endless belt 3 and the pressing mechanism 4 side μ _L : Average friction coefficient between the outer surface 3b of the endless belt 3 and the slit strip 2 μ ₀ : Between the inner surface 3a of the endless belt 3 and the pneumatic action Coefficient of friction μ ₁ : Inner surface 3a of endless belt 3 and contact piece 15
a _{2 is the} coefficient of friction between the outer surface 3b of the endless belt 3 and the slit strip 2, and the sliding friction force between the inner surface 3a of the endless belt 3 and the pressing mechanism 4 is μ _U · N = μ ₀ · p · A + μ ₁ · F...

Here, since it is the friction coefficient mu ₀ between the inner surface 3a and pneumatic action of the endless belt 3 is considered very small zero (μ _{0 = 0),} the above _{equation, μ U · N = μ 1} · F becomes Further, since N = F + p · A, μ _U = μ ₁ · F / (F + p · A).

On the other hand, sliding frictional force between the outer surface 3b and the slit strips 2 of the endless belt 3, since represented by _{μ L · N = μ 2 ·} N ......, the μ _{L =} μ ₂ .......

When these equations are substituted into the above equation, μ ₁ · F / (F + p · A) <μ _{2, that} is, the condition for preventing the slip from occurring between the outer surface 3b of the endless belt 3 and the slit strip 2 Is as follows: μ ₂ > μ ₁ · F / (F + p · A)

Here, since F / (F + p · A) <1..., For example, even when μ ₂ is considerably smaller than μ ₁ , that is, when oil or the like adheres to the surface of the slit strip 2, the endless belt 3 Even when the outer surface 3b and the slit strip 2 are quite slippery, the value of p · A (total air pressure) in the equation is compared with F (contact pressure between the contact piece 15a) and the inner surface 3a of the endless belt 3). By making it sufficiently large, it is possible to satisfy the expression, and it is possible to prevent slippage from occurring between the outer surface 3b of the endless belt 3 and the slit strip 2.

In contrast, in the conventional apparatus, because there is no air pressure (p · A = 0), a N = F, the sliding friction force between the inner surface 3a and the pressing mechanism 4 side of the endless belt 3, mu _U · Since N = μ ₁ · F, μ _U = μ ₁ ...

Further, the sliding friction between the outer surface 3b and the slit strips 2 of the endless belt 3, since represented by _{μ L · N = μ 2 ·} N, the μ _{L =} μ ₂ .......

Therefore, when these equations are substituted into the above equation,
In the conventional device, as a condition for preventing a slip from occurring between the outer surface 3b of the endless belt 3 and the slit strip 2, the following condition must be satisfied: μ ₂ > μ _1. It is necessary to make the space between the inner surface 3a of the endless belt 3 and the pressing mechanism 4 side more slippery than the space between the outer surface 3b of the endless belt 3 and the slit strip 2.

For this reason, when fats and oils etc. adhere to the surface of the band plate and are very slippery, slipping easily occurs between the outer surface 3b of the endless belt 3 and the slit band plate 2.

The present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.

For example, in the above embodiment, the endless belt 3
Is stretched between a pair of pulleys 5, but may be stretched between two or more pulleys 5, for example.

〔The invention's effect〕

As is apparent from the above description, according to the strip tension applying device of the present invention, the pressing mechanism for pressing the inner surface of the endless belt is constituted by the air pressure member and the winding tension applying member. Accordingly, pressing and pressing of the outer surface of the endless belt to the slit strip can be performed in a state where the sliding friction resistance is almost zero by using the air pressure member of the pressing mechanism.

The sliding friction between the inner surface of the endless belt and the inner surface of the endless belt can be used only to generate a predetermined winding tension using the winding tension applying member of the pressing mechanism. Even when the material whose frictional resistance is extremely small compared to the material of the outer surface is not used, the sliding frictional resistance between the slit band and the outer surface can be kept larger than the inner surface. Thus, even in a very slippery state, it is possible to prevent a slip from occurring between the slit strip and the outer surface of the endless belt.

As a result, it is possible to reliably adjust the imbalance in tension that occurs when each slit strip is wound up and to apply an even tension, and it is possible to fully exhibit the excellent advantages inherent in this device. Become.

[Brief description of the drawings]

Drawings show an embodiment of a winding tension applying device for a strip according to the present invention, FIG. 1 is a front view of the tension applying device, FIG. 2 is a side sectional view of a main part of the tension applying device, FIG. 3 is a sectional view taken along the line AA of FIG. [Explanation of symbols] 1: tension applying device, 2: slit strip 3: endless belt, 3a: inner surface 3b: outer surface, 4: pressing mechanism 5: pulley 6: upper bearing bracket 7: lower bearing bracket 8: front Shaft, 9: Rear shaft 10: Connecting rod, 11: Hydraulic cylinder 12: Stand 14: Air pressure body 14a: Compressed air supply source, 14b: Pressure regulator 14c: Piping, 14d: Piping connection port 14e: Compressed air chamber, 14f: Compressed air injection port 15: Winding tension applying body 15a: Contact piece

Claims (1)

(57) [Claims] A plurality of endless belts, which are held in a freely circulating manner and are arranged side by side in the width direction, are vertically opposed to each other. The endless belt is pressed against and pressed against the slit strip passed between the opposing outer surfaces of the upper and lower endless belts, and the endless belt circulates integrally with the moving slit strip by crimping with the slit strip. A tension applying device that applies tension to each slit strip with a sliding frictional force between the pressing mechanism and the inner surface of the endless belt, wherein the pressing mechanism that presses the inner surface of each endless belt includes compressed air. Injects the inner surface of the endless belt to press the inner surface of the endless belt, and presses the outer surface of the endless belt, which is the back side of the inner surface, against the slit strip And air pressure body to be crimped, the winding tension device of the strip, characterized by being configured and a take-up tensioning member.