JP3190950B2 - Expander roller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expander roller used as a wrinkle-extending and wrinkle-preventing feed roller when conveying various sheet materials and tape materials such as plastic films, papers, woven fabrics and nonwoven fabrics.

[0002]

2. Description of the Related Art As a conventional expander roller, there is a spindle roller with a middle height. Further, there is a straight expander roller as a conventional expander roller. In the straight expander roller, the aluminum shoe attached to the roller surface performs horizontal movement on both sides by the action of the internal device due to the rotational movement of the roller, and performs the wrinkle expansion of the conveyed material such as sheet material and tape material. It has become.

Further, as a conventional expander roller, for example, there is a curved expander roller as shown in Japanese Patent Publication No. 54-7915. That is, a notch is provided in the lower half of the shaft, a tensile load is applied to a tension bar in the shaft, the shaft is bent, and wrinkling of the fed sheet material is performed.

[0004]

However, in the conventional crown roller, when a conveyed object comes into contact with the roller, first, the center portion thereof comes into contact, and then the entire width comes into contact.
The center part also leaves at the end when leaving the roller. For this reason, the contact between the transported object and the roller becomes a point contact at the central portion immediately before the contact starts and immediately separates, and a local force is applied to the central portion of the transported object, thereby distorting the transported object. There was a problem that there was.

Further, in the conventional straight expander roller, there is a gap between the expander belts, so that there is a problem that the conveyed product may come into line contact with a corner portion of the belt and cause distortion.

Further, in the conventional curved expander roller, since the roller is curved, a local distortion is given to the sheet material to be fed, and the distortion remains in the product, which may deteriorate the quality. Was. In particular,
In the case of a thin, low-stretch film material, the degree of distortion was severe, and the quality was adversely affected.

[0007] The present invention has been made in view of such conventional problems, and provides an expander roller that improves the quality of products without distorting conveyed articles such as sheet materials and tape materials. It is an object.

[0008]

In order to achieve the above object, an expander roller according to the present invention is cylindrical, has a core and an upper layer, and at least the upper layer has rubber-like elasticity. The core body and the upper layer body have different compression elastic moduli from each other, and the thickness of the core body and the upper layer body with the smaller compression elastic modulus is thicker at both ends than at the center side, and the center against the vertical load on the side faces The compression amount at both ends is larger than the compression amount at the side.

The core may not have rubber-like elasticity. The core may be composed of a single member or a plurality of members. The smaller thickness of the compression elastic modulus between the core and the upper layer is preferably such that the thickness continuously increases from the center side to both end sides, but the thickness may be increased stepwise. .

In the expander roller according to the present invention, when the angle between the roller and the conveyed object is small, such as when the conveyed object starts to contact the roller, the pressure in the vertical direction against the side surface of the roller is small. Does not deform, maintains a cylindrical shape, and unlike a spindle-shaped crown roller, the entire width of a conveyed material such as a sheet material or a tape material is in contact with the roller. For this reason, when you start touching the rollers,
No local distortion is applied to the center of the conveyed object.

[0011] As the angle between the roller and the conveyed object increases, the vertical pressure on the roller increases due to the tension of the conveyed object. At this time, the core body or the upper layer body is compressed, and both ends having a smaller compression elastic coefficient are more dented than the center side, and the contact surface with the conveyed object is curved. As a result, the conveyed material is tensioned outward in the width direction, so that wrinkles are extended and wrinkles are prevented.

When the conveyed object leaves the roller, the angle between the roller and the conveyed object becomes small again, so that the dents on both ends return to form a cylindrical surface. For this reason, the conveyed object contacts the roller over its entire width, and does not give local distortion to the center of the conveyed object, as in the case where the conveyed object starts to touch the roller. The expander roller according to the present invention can be used not only as a feed roller but also as a nip roll.

[0013] In the expander roller according to the present invention, the core body includes a cylindrical shaft core and a spindle-shaped lower layer body provided on the outer periphery thereof, and the upper layer body is provided on the outer circumference of the lower layer body. It may be.

In this case, if the upper layer body is made of a soft material having a large coefficient of friction, a conveyed object made of a slippery material can be easily conveyed without slippage.

The shaft core may be made of metal, carbon fiber, or any other material. The material of the lower layer body and the upper layer body is NR, NBR, BR, SBR, CR, II
Any rubber such as R, EPDM, or a mixture of two or more of these may be used. The lower layer body and the upper layer body may be made of different rubbers, or may be made of the same rubber with different amounts of softener added.

In the expander roller according to the present invention, the core is a spindle, and the upper layer is a cylindrical inner layer provided on the outer periphery of the core and an outer layer provided on the outer periphery of the inner layer. The inner layer body may have a compression elastic modulus smaller than that of the surface layer body.

Further, in the expander roller according to the present invention, the core body includes a cylindrical shaft core and an inverted spindle-shaped lower layer body provided on the outer periphery thereof, and the upper layer body is provided on the outer circumference of the lower layer body. The lower layer body may have a smaller compression modulus than the upper layer body.

In this case, if the surface side of the upper layer body is made of a hard material which is hard to be worn, even a conveyed article made of a hard material is hardly damaged on the surface of the roller, and the durability can be improved.

The inverted spindle shape is a rotating body shape such as a single hyperbolic rotating body in which the diameter at the center is smaller than the diameter at both ends, contrary to the spindle shape.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. The expander roller 1 includes a shaft core 2, a lower layer body 3, and an upper layer body 4. The shaft core 2 is
It is made of iron. The lower layer body 3 is provided on the outer periphery of the shaft core 2. The lower layer body 3 is a spindle-shaped cylinder, and the outer diameter of the central portion 3a is larger than the outer diameter of both end sides 3b. Shaft core 2
The lower body 3 and the upper body 4 constitute a core body. The upper layer body 4 is provided on the outer periphery of the lower layer body 3 and has a cylindrical shape with a uniform outer diameter, and is thicker at both ends 4b than at the center 4a.

The lower body 3 and the upper body 4 are entirely made of homogeneous rubber and have rubber-like elasticity. The rubber of the lower layer body 3 and the rubber of the upper layer body 4 have different compression elastic coefficients, and the rubber of the upper layer body 4 has a larger coefficient of friction than the rubber of the lower layer body 3 and is soft. The upper layer body 4 has a smaller compressive elastic modulus than the lower layer body 3, and the expander roller 1 has a lower end than the center side 1 a with respect to the vertical load on the side.
The compression amount of b increases. It is preferable to set the type and thickness of the rubber of the upper layer body 4 according to the material and thickness of the conveyed object, the running speed, and the like. Lower layer body 3 and upper layer body 4
As an example, a mixture obtained by adding a softening agent to a mixed rubber of EPDM and NR can be used.

Next, the operation will be described. The expander roller 1 is used for spreading and preventing wrinkles of a conveyed material such as a sheet material and a tape material. When the angle between the roller 1 and the transported object is small, such as when the transported object starts to contact the roller 1, the outer shape is not deformed and the cylindrical shape is maintained because the pressure in the vertical direction against the side surface of the roller 1 is small. Unlike the spindle-shaped crown roller, the conveyed material contacts the roller 1 over its entire width. For this reason, a local distortion is not given to the central portion of the conveyed object at the beginning of contact with the roller 1.

As the holding angle between the roller 1 and the conveyed article increases, the pressure in the vertical direction on the roller 1 increases due to the tension of the conveyed article. At this time,
The shaft core 2 and the lower layer 3 are hardly deformed, but the upper layer 4 is compressed. Since the upper layer body 4 is thicker at both ends 4b than at the center 4a, both ends 4b are more recessed with respect to the center 4a,
The contact surface with the conveyed object is curved. As a result,
It is tensioned outward in the width direction, so that wrinkles are extended and wrinkles are prevented.

When the conveyed object leaves the roller 1,
Since the hugging angle between the roller 1 and the conveyed object is reduced again, the dent at both ends 1b returns to form a cylindrical surface. Therefore, the entire width of the conveyed material comes into contact with the roller 1 and the roller 1
As in the beginning of the description, no local distortion is given to the central portion of the conveyed object. As described above, wrinkle extension and wrinkle prevention can be performed without giving any distortion to the conveyed object, and the quality of the product can be improved. In particular, a film material that is thin and has low elasticity easily causes distortion, but the expander roller 1 does not cause distortion even with such a film material, and is suitable for conveyance. In addition, since the upper layer body 4 has a large coefficient of friction and is soft, in the case of a conveyed object made of a slippery material,
Slippery and easy to transport.

In the expander roller 1, the degree of curvature (crown amount) of the roller surface changes by changing the pressing force between the conveyed object and the roller 1, so that the tension of the conveyed object is changed, and the wrinkles are extended and wrinkled. A crown amount suitable for prevention can be obtained. The expander roller 1 is particularly effective in the process of manufacturing and processing plastic films, woven fabric, nonwoven fabric, paper, and the like, and the process of manufacturing and processing metal foil.

Next, a second embodiment of the present invention will be described. FIG. 2 shows a second embodiment of the present invention. The expander roller 11 includes a core 12, an inner layer 13, and a surface 14. The core 12 is made of iron and has a spindle shape. The inner layer body 13 is provided on the outer periphery of the core body 12. The inner layer body 13 has a cylindrical shape with a uniform outer diameter, and is thicker at both ends 13b than at the center 13a. The surface layer body 14 is provided on the outer periphery of the inner layer body 13 and has a thin cylindrical shape with a uniform outer diameter. Inner layer body 13 and surface layer body 1
4 constitutes an upper layer body with respect to the core body. The inner layer body 13 and the surface layer body 14 are entirely made of homogeneous rubber and have rubber-like elasticity. The rubber of the inner layer body 13 and the rubber of the surface layer body 14 have different compression elastic coefficients, and the rubber of the inner layer body 13 is softer than the rubber of the surface layer body 14. Inner layer 1
3 has a smaller compression elastic modulus than the surface layer body 14, and the expander roller 11 has a larger compression amount at both ends 11b than a compression amount at the central side 11a with respect to a vertical load on the side surface.

In the expander roller 11, since the thickness of the inner layer body 13 having a small compression elastic modulus is thicker at both ends 11b than at the center side 11a, both ends 11b are depressed as the hugging angle between the roller and the conveyed object increases. Wrinkle extension and wrinkle prevention are provided. Since the expander roller 11 has a cylindrical surface in a portion where no pressure is applied, the expander roller 11 does not give any distortion to the conveyed object immediately before the contact with the roller or immediately before the contact with the roller, thereby improving the product quality.

The expander roller 11 may be constituted by the core 12 and the inner layer 13 without providing the surface layer 14. In this case, expander roller 1
1 has a simple configuration and is easy to manufacture.

Next, a third embodiment of the present invention will be described. FIG. 3 shows a third embodiment of the present invention. The expander roller 21 includes a shaft core 22, a lower layer body 23, and an upper layer body 24. The shaft core 22 is made of iron and has a cylindrical shape. The lower layer body 23 is provided on the outer periphery of the shaft core 22. The lower layer body 23 has a reverse spindle shape, and the outer diameter of the central side 23a is smaller than the outer diameter of both end sides 23b. The lower layer body 23 is thicker on both end sides 23b than on the center side 23a. The shaft core 22 and the lower layer body 23 constitute a core body with respect to the upper layer body 24. The upper body 24 is the lower body 23
And has a cylindrical shape with a uniform outer diameter, and is thicker at the center side 24a than at both end sides 24b. Lower body 23
The upper layer body 24 is entirely made of homogeneous rubber and has rubber-like elasticity. The rubber of the lower body 23 and the rubber of the upper body 24 have different compression elastic coefficients, and the rubber of the lower body 23 is softer than the rubber of the upper body 24. For the upper layer body 24, rubber of a material that is hard and hard to wear is used. The lower layer body 23 has a smaller compression elastic modulus than the upper layer body 24, and the expander roller 21 has a larger compression amount at both ends 21b than a compression amount at the center side 21a with respect to a vertical load on the side surface.

In the expander roller 21, since the lower layer 23 having a small compression elastic modulus is thicker at both ends 23b than at the center 23a, both ends 23b are depressed as the angle between the roller and the conveyed object increases. Wrinkle extension and wrinkle prevention are provided. Since the expander roller 21 has a cylindrical surface in a portion where pressure is not applied, the expander roller 21 does not distort the conveyed object immediately before the contact with the roller or immediately before leaving the roller, thereby improving the quality of the product. Since the upper layer body 24 of the expander roller 21 is hard and hard to wear, even if the conveyed object is made of a hard material, the surface of the roller is hardly damaged and the durability can be improved.

[0031]

According to the expander roller according to the present invention, since the compression amount at both ends is larger than the compression amount at the center side with respect to the vertical load on the side surface, the roller and the conveyed object are in a cylindrical shape. As the hugging angle increases, both ends are dented to prevent wrinkles from spreading and wrinkling, and do not distort the conveyed material immediately before starting to touch the roller or just before leaving it.
Product quality can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an expander roller according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of an expander roller according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of an expander roller according to a third embodiment of the present invention.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Expander roller 2 Core 3 Lower layer 4 Upper layer

Continuation of the front page (56) References JP-A 2-58927 (JP, U) JP-A 49-139483 (JP, U) JP-A 53-10985 (JP, U) JP-B 43-21462 (JP) , B1) Japanese Patent Publication No. 39-18064 (JP, B1) Japanese Patent Publication No. 40-28910 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06C 3/06

Claims (4)

(57) [Claims] A cylindrical body having a core body and an upper layer body, at least the upper layer body has rubber-like elasticity, and the core body and the upper layer body have different compression elastic coefficients from each other; An expander roller characterized in that the thickness of the smaller compression elastic modulus between the upper layer and the upper layer is greater at both ends than at the center, and the amount of compression at both ends is greater than the amount of compression at the center with respect to the vertical load on the side surface. 2. The apparatus according to claim 1, wherein said core body comprises a cylindrical shaft core and a spindle-shaped lower body provided on an outer periphery thereof, and said upper body is provided on an outer periphery of said lower body. 1
The described expander roller. 3. The core body has a spindle shape, and the upper layer body includes a cylindrical inner layer body provided on an outer periphery of the core body and a cylindrical surface layer body provided on an outer periphery of the inner layer body. The expander roller according to claim 1, wherein the inner layer body has a smaller compression modulus than the surface layer body. 4. The core body comprises a cylindrical shaft core and an inverted spindle-shaped lower layer body provided on the outer periphery thereof, the upper layer body is provided on the outer circumference of the lower layer body, and the lower layer body is The compression elastic modulus is smaller than the upper layer body.
The described expander roller.