JP2009156299A - Roller and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller capable of reducing cost by reducing polyurethane foam wasted during manufacturing, preventing periodical unevenness of an image caused by rotation of the roller when used as a toner supply roller, a charge cleaning roller or a transfer roller, and obtaining an excellent image. <P>SOLUTION: In the roller 10, a shaft 21 is inserted to the center of a cylindrical roller main body 11 comprising polyurethane foam. The roller main body 11 is formed by cylindrically combining and bonding a plurality of columnar bodies 13 comprising cuts of polyurethane foam so that the length direction of the columnar bodies 13 is equal to the length direction of the roller main body 11 and by cylindrically applying surface treatment. The foaming direction of the columnar bodies 13 is the thickness direction of the columnar bodies 13, and one side in the thickness direction of the columnar bodies 13 is made abut on the surface of the shaft 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a urethane foam roller used in an electrophotographic image forming apparatus such as a copying apparatus, an image recording apparatus, a printer, and a facsimile machine, and a manufacturing method thereof.

  A roller having a shaft inserted into the center of a cylindrical roller body made of urethane foam is a charging cleaning roller for cleaning the charging roller to uniformly charge the electrophotographic photosensitive member to a predetermined potential, and the electrophotographic photosensitive member A toner supply roller for supplying toner to a developing roller that conveys the toner to an electrostatic latent image formed on an image carrier and visualizes the toner image on the surface thereof, and the toner image is applied to a recording medium or an intermediate transfer belt. Widely used in the field of electrophotographic technology, such as a transfer roller for transferring.

  Urethane foam is a material that has many advantages such as low hardness but moderate hardness, low compression set, and low density that can provide a low-cost roller. In particular, in a toner supply roller and a charging cleaning roller, urethane foam having a tough cell skeleton and an appropriate hardness is preferable, and is a mainstream material for the roller body.

  As a conventional urethane foam roller, (1) a shaft insertion hole is formed in a slab urethane foam or a foamed urethane foam, then cut out in the size of one roller body, and then the shaft is inserted into the shaft insertion hole. The surface is polished and processed into a cylindrical shape to form a roller body. (2) The urethane foam is formed integrally with the shaft and then the unnecessary portion of the urethane foam is polished. (3) The shaft is arranged. For example, urethane foam is foamed in a roller-shaped foaming mold, and a roller body is formed integrally with a shaft. In addition, slab urethane foam is produced continuously by discharging the urethane foam raw material that has been mixed and stirred onto a belt conveyor, and naturally foaming and curing the raw material at room temperature and atmospheric pressure while the conveyor belt moves. Then, after being cured (cured) in a drying furnace, it is cut into blocks of a predetermined size (usually a rectangular parallelepiped shape). On the other hand, a urethane foam foam is obtained by injecting a urethane foam raw material that has been mixed and stirred into a mold and foaming it in the mold.

  Among the above (1) to (3), the roller of (1) does not require a roller-shaped foaming mold, so there is no complication associated with mold management and repair, and a defect associated with the injection of urethane foam raw material into the mold ( For example, slab urethane foam with excellent mechanical properties such as distortion and wear resistance can be used without the risk of pinholes due to air entrainment, changes in the characteristics of urethane foam due to changes in the mixing ratio of urethane foam materials, etc. It is preferable.

  However, in the method of cutting foam material for roller bodies from slab urethane foam or molded foamed urethane foam, it is necessary to cut out with a size that allows for allowances from the accuracy of cutting and the accuracy of the drilling position of the shaft insertion hole. If 50% or more of the cut foam material is not removed, the desired roller body cannot be obtained, and there is a lot of waste.

  Furthermore, the slab urethane foam has a different cell shape and hardness in the foaming direction (vertical direction when foaming on the conveyor belt) and the direction orthogonal to the foaming direction. For this reason, when a roller having a roller body cut out from a slab urethane foam and processed into a cylindrical shape is used as a toner supply roller, the scraping property and supply property of the toner differ depending on the rotation angle of the roller, and the printing surface An uneven portion of image density may appear at a period of several mm to several tens of mm. In addition, when a roller having a roller body cut out from a slab urethane foam and processed into a cylindrical shape is used as a transfer roller or a charging cleaning roller, the hardness of the roller body and the cell shape vary depending on the rotation angle of the roller, and the scraper is scraped. The unevenness may appear periodically in the output image because the take-off property and the manner of deformation of the contact portion are periodically different.

JP-A-8-334971 Japanese Patent Laid-Open No. 3-155575

  The present invention has been made in view of the above points, and can reduce the cost by reducing urethane foam that is wasted during manufacturing. When used with a toner supply roller, a charging cleaning roller, or a transfer roller, the roller It is an object of the present invention to provide a roller that can hardly cause periodic unevenness due to the rotation of the image and can obtain a good image, and a method for manufacturing the roller.

  The invention according to claim 1 is a roller in which a shaft is inserted through the center of a cylindrical roller main body made of urethane foam. The roller main body has a plurality of columnar bodies made of urethane foam cut out in the length direction of the columnar body. Are combined in a cylindrical shape in the length direction of the roller main body and bonded to form a cylindrical surface.

  According to a second aspect of the present invention, in the first aspect, the foaming direction of the urethane foam constituting the columnar body is the thickness direction of the columnar body, and one side in the thickness direction of the columnar body is in contact with the surface of the shaft. It is characterized by.

  According to a third aspect of the present invention, in the method of manufacturing a roller in which a shaft is inserted through the center of a cylindrical roller body made of urethane foam, a plurality of columnar bodies made by cutting out urethane foam are arranged such that the length direction of the columnar bodies is It is arranged on the outer periphery of the temporary shaft so as to be in the length direction of the roller body, combined in a cylindrical shape, and bonded to form a combined body, and the temporary shaft is removed from the combined body, and the temporary shaft in the combined body is removed. The shaft is inserted after the shaft is pulled out, and the combined body is processed into a cylindrical shape to form a roller body.

  According to a fourth aspect of the present invention, in the method of manufacturing a roller in which a shaft is inserted through the center of a cylindrical roller body made of urethane foam, a plurality of columnar bodies made by cutting out urethane foam are arranged such that the length direction of the columnar bodies is It is arranged on the outer periphery of the shaft so as to be in the length direction of the roller body, and is combined into a cylindrical shape and bonded to form a combined body, and the combined body and the shaft are bonded together, and the combined body is cylindrical It is characterized in that a roller body is formed by surface processing.

  The invention of claim 5 is the invention according to claim 3 or 4, wherein the foaming direction of the urethane foam constituting the columnar body is the thickness direction of the columnar body, and one side in the thickness direction of the columnar body is inward. The columnar bodies are combined in a cylindrical shape.

  A sixth aspect of the present invention is the method according to any one of the third to fifth aspects, wherein the plurality of columnar bodies have the same shape including a polygonal column shape having an isosceles trapezoidal cross section, and the short side of the parallel sides of the trapezoid The columnar bodies are combined in a cylindrical shape with the inside as the inside.

  According to the first aspect of the present invention, the roller main body is bonded to a cylinder by combining a plurality of columnar bodies made of urethane foam cut out in a cylindrical shape with the length direction of the columnar bodies being the length direction of the roller main body. Because it is made of a surface processed into a shape, it is not necessary to cut out with a size that allows for margins due to the accuracy when cutting out from urethane foam as in the past and the drilling position accuracy of the shaft insertion hole, which is wasted Cost can be reduced by reducing urethane foam. In addition, the columnar bodies can be combined into a cylindrical shape in consideration of the foaming direction of the urethane foam that constitutes the columnar body, so the roller rotation caused by the hardness and cell shape resulting from the foaming direction differing depending on the rotation angle of the roller Periodic unevenness of time can be suppressed.

  According to the invention of claim 2, the foaming direction of the urethane foam constituting the columnar body is the thickness direction of the columnar body, and one side of the columnar body in the thickness direction is in contact with the surface of the shaft. The foaming direction of each columnar body arranged on the outer circumference of the roller is equal to or parallel to the diameter direction (radial direction) of the shaft, and is almost in the direction of the roller center (or the opposite direction) in the roller cross section. Periodic unevenness at the time of roller rotation, which is caused by the difference in hardness and cell shape due to the direction depending on the rotation angle of the roller, can be suppressed.

  According to the invention of claim 3, a combined body in which a plurality of columnar bodies formed by cutting out urethane foam are combined and bonded in a cylindrical shape so that the length direction of the columnar bodies is the length direction of the roller body Since the surface of the cylinder is processed into a roller body, there is no need to cut it out in a size that allows for extra space from the accuracy when cutting out from urethane foam, the accuracy of the drilling position of the shaft insertion hole, etc., and wasteful urethane Costs can be reduced by reducing the form. Furthermore, since the columnar bodies can be combined into a cylindrical shape in consideration of the foaming direction of the urethane foam constituting the columnar body, the hardness and cell shape resulting from the foaming direction of the urethane foam vary depending on the rotation angle of the roller. Periodic unevenness during roller rotation can be suppressed. Furthermore, in the invention of claim 3, after the coupling body is formed, the shaft is inserted into the shaft insertion hole of the coupling body, so that a shaft having a diameter larger than the shaft insertion hole of the coupling body is inserted into the shaft insertion hole. Thus, it is possible to firmly bond the combined body and the shaft.

  According to the invention of claim 4, a combined body in which a plurality of columnar bodies made of urethane foam are combined and bonded in a cylindrical shape so that the length direction of the columnar bodies is the length direction of the roller body Since the roller body is processed into a cylindrical shape, the waste urethane foam can be reduced as in the invention of claim 3 to reduce the cost, and the hardness caused by the foaming direction of the urethane foam can be reduced. Periodic unevenness at the time of roller rotation caused by the difference in cell shape depending on the rotation angle of the roller can be suppressed. Furthermore, in the invention of claim 4, since the columnar bodies are arranged on the outer periphery of the shaft and combined into a cylindrical shape and bonded to form a bonded body, and the bonded body and the shaft are bonded together, It is not necessary to pass through the roller body, and the manufacturing work can be simplified.

  According to invention of Claim 5, the foaming direction of the urethane foam which comprises a columnar body is made into the thickness direction of the said columnar body, and the one side of the thickness direction of the said columnar body is made inward, and the said columnar body is made into a cylinder shape. Because of the combination, the foaming direction in each columnar body is equal to or parallel to the diameter direction (radial direction) of the shaft, and is almost in the direction of the roller center (or the opposite direction) in the roller cross section. It is possible to easily manufacture a roller that can suppress periodic unevenness at the time of roller rotation caused by the difference in hardness and cell shape depending on the rotation angle of the roller.

  According to the invention of claim 6, the plurality of columnar bodies have the same shape including a polygonal column having an isosceles trapezoidal cross section, and the columnar body is formed in a cylindrical shape with the short side of the parallel sides of the trapezoid as the inner side. Since it combines, it can be made difficult to produce a clearance gap between the combined columnar bodies.

  FIG. 1 is a perspective view of a roller according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the roller, FIG. 3 is a view showing a cut out columnar body, and FIG. FIG. 5 is a cross-sectional view showing a case where a cylindrical body is bonded using a pressing die, FIG. 6 is a perspective view showing a state where columnar bodies are combined in a cylindrical shape, and FIG. 7 is a cylindrical shape. FIG. 8 is a perspective view when the shaft is inserted into the tubular combined body, and FIG. 9 is a perspective view of the state where the shaft is inserted into the tubular combined body. It is.

  A roller 10 shown in FIGS. 1 and 2 is used for a toner supply roller, a charging cleaning roller, and the like in a copying apparatus, an image recording apparatus, a printer, a facsimile, and the like. The roller 10 is formed by inserting a metal shaft 21 into the center of a cylindrical roller body 11 made of urethane foam.

  The roller body 11 has a plurality of columnar bodies 13 made of urethane foam cut and bonded in a cylindrical shape by combining the columnar bodies 13 with the length direction L1 of the columnar bodies 13 as the length direction L2 of the roller body 11. It consists of a surface processed product. The said columnar body 13 consists of what was cut out from the slab urethane foam or the type | mold foaming urethane foam.

The foaming direction of the urethane foam constituting the columnar body 13 is the thickness direction of the columnar body 13, and one side 131 in the thickness direction of the columnar body 13 is in contact with the surface of the shaft 21. The foaming direction of the urethane foam is the vertical direction when foaming the slab or foaming the mold. Further, as urethane foam, a density of about 10 to 200 kg / m ³ , an open cell structure of about 5 to 150 cells / 25 mm, hardness of 10 to 90 ° (Asuka F hardness meter, durometer for sponge manufactured by Kobunshi Keiki Co., Ltd.) ), Strain (JIS K 6400-4 4.5.2 A method) 5% or less is preferable. Further, the thickness of the roller body 11 varies depending on the machine on which the roller 10 is mounted, but an example is about 1 to 10 mm.

  Adhesion of the plurality of columnar bodies 13 is performed by a binder applied to the bonding surface of the columnar bodies 13 or by a binder impregnated in the columnar bodies 13. As the binder, a water-based resin is preferable from the viewpoint of chemical resistance to the urethane foam constituting the columnar body 13. Examples of water-based resins include synthetic resin emulsions (acrylic, urethane, polyester, polyamide, acrylonitrile rubber, EPDM, IR, CR, silicone rubber, etc.), or water-soluble polymers (ethylene oxide, ethylene oxide-propylene oxide copolymer, Polyacrylic acid or a derivative thereof, and a water-soluble nylon resin). In addition, in order to develop the electrical conductivity required as a functional roller such as a toner supply roller, carbon fine particles such as carbon black, and an electron conductivity imparting substance such as conductive metal oxide or metal particles are used as fillers or perchloric acid. An ion conductivity imparting substance such as lithium or a quaternary ammonium salt may be included in the binder as an additive. The cylindrical surface processing is performed by a known method such as cutting or polishing.

  Next, a method for manufacturing the roller 10 will be described. The method of manufacturing the roller 11 includes a method of inserting a shaft after combining a plurality of columnar bodies in a cylindrical shape, and a method of integrating the shaft when combining a plurality of columnar bodies in a cylindrical shape and combining them. There is.

  In the manufacturing method in the case where the shaft is inserted into the roller body later, first, as shown in FIG. 3, the columnar body 13A is formed from a slab urethane foam or a foamed urethane foam 15 into a polygonal column (a column having a polygonal cross section). Cut out.

  The polygonal columnar body 13A is preferably an isosceles trapezoidal (also called an isosceles trapezoidal) polygonal columnar shape (columnar section having an isosceles trapezoidal cross section) as shown. The columnar body 13A is cut out such that the foaming direction of the urethane foam, that is, the foaming direction of the columnar body 13A is the thickness direction of the columnar body 13A. The cutting is performed by a known cutting device, for example, a product number BSL 200 skiing machine manufactured by Boimer. The thickness of the columnar body 13A is larger than the wall thickness of the roller main body 11, usually 5 to 20 mm. If the columnar body 13A is too thin, it will be difficult to cut out, while if the width of the columnar body 13A (the circumferential width when the columnar bodies 13A are combined in a cylindrical shape) becomes too large, the roller body In this case, uneven cell shape and hardness in the circumferential direction are likely to occur. Therefore, the size and shape of the columnar body 13A that can be formed into a cylindrical shape by combining 6 to 8 columns are preferable. That is, it is preferable that the outer shape of the combined body in which the columnar bodies 13 </ b> A formed of isosceles trapezoidal polygonal columns are combined and bonded in a cylindrical shape is a hexagon to an octagon.

  Next, the plurality of columnar bodies 13A are arranged on the outer periphery of the temporary shaft 21A as shown in FIG. 4 and combined into a cylindrical shape, the columnar bodies 13A are bonded together, and the cylindrical combined body 11A shown in FIG. Form. The columnar body 13A has a foaming direction of a columnar body thickness direction T1, and the columnar body 13A is combined in a cylindrical shape with one side 131A in the thickness direction T1 of the columnar body 13A inward. The columnar body 13A is impregnated or coated with the binder. Depending on the type of the binder, in order to shorten the bonding time of the binder, etc., the columnar body 13A is also heated with a cylindrical combination. Further, in order to prevent the columnar body 13A from shifting until the bonding by the binder is completed, the columnar body 13A and the temporary shaft 21A may be housed in a pressing die 41 having a cylindrical inner surface as shown in FIG.

  The temporary shaft 21A is made of a material that does not adhere to the columnar body 13A by the binder, for example, a resin such as polypropylene or polytetrafluoroethylene (PTFE). In addition, it is possible to use a product obtained by applying a release agent to a metal shaft or the like that is normally used and then drying it. The diameter of the temporary shaft 21A is preferably slightly smaller than the diameter of the shaft 21, for example, about 1 to 5 mm. If the diameter of the temporary shaft 21A is made smaller than the diameter of the shaft 21, a shaft insertion hole (center hole) formed after the temporary shaft 21A is removed from the combined body 11A in which the columnar bodies 13A are combined and bonded in a cylindrical shape. However, since the diameter is smaller than the diameter of the shaft 21, the shaft 21 and the combined body 11A can be firmly coupled by press-fitting the shaft 21 into the shaft insertion hole.

  As shown in FIG. 6, the temporary shaft 21 </ b> A is pulled out from a combined body 11 </ b> A in which the plurality of columnar bodies 13 </ b> A are combined and bonded in a cylindrical shape. Thereby, as shown in FIG. 7, the shaft insertion hole 25 is formed in the center of the combined body 11A after the temporary shaft 21A is pulled out. The outer shape of the combined body 11A has a polygonal column shape.

  Next, as shown in FIG. 8, the shaft 21 is inserted into the shaft insertion hole 25 of the combined body 11A. FIG. 9 shows a state where the shaft 21 is inserted through the combined body 11A. As described above, the shaft 21 has a predetermined diameter larger than that of the temporary shaft 21A. In order to firmly fix the shaft 21A to the shaft insertion hole 25, an adhesive is applied to the surface of the shaft 21A.

  The roller body 10 shown in FIGS. 1 and 2 can be obtained by forming the roller body 11 by forming the polygonal column-shaped combined body 11A through which the shaft 21 is inserted into a cylindrical shape by surface processing such as cutting and polishing.

  On the other hand, in the method of integrating the plurality of columnar bodies into a cylindrical shape and combining the shafts, the shaft 21 is used instead of the temporary shaft 21A, and an adhesive is applied to the surface of the shaft 21. Just keep it. It is not necessary to remove the temporary shaft and press-fit the shaft, and the others are the same as in the case of using the temporary shaft.

Examples 1 to 3
From the long sheet (the foaming direction is the thickness direction, width 50 mm × thickness 6.5 mm) of the slab urethane foams A, B, and C (made by INOAC Corporation) having the density, cell number, and hardness shown in Table 1. Of these two sides, one of the two parallel sides is 1.7 mm, the other side is 7.0 mm, the two hypotenuses have the same length, and the angle between the two parallel sides and the hypotenuse is 112.5 degrees and 67 Eight isosceles trapezoidal polygonal columnar bodies of 5 degrees were cut out by slit processing. The obtained isosceles trapezoidal polygonal columnar body has a thickness of 6.5 mm and a length of 240 mm. This isosceles trapezoidal polygonal columnar body was impregnated with a binder, and excess binder was squeezed out so that the solid content was 30% by weight with respect to the polygonal columnar body before impregnation. The binder composition is 100 parts by weight of acrylic latex (product number: LX851, Nippon Zeon Co., Ltd., solid content 45%), carbon black aqueous dispersion (product number: Ecomar Black C, Sanyo Dye Co., Ltd., solid content 36%) 100 Part by weight, 200 parts by weight of water, and 2 parts by weight of a surfactant (penetrating agent, antifoaming agent). After impregnating the binder, eight isosceles trapezoidal polygonal columnar bodies are placed around a polypropylene resin temporary shaft having a diameter of 4 mm and a length of 250 mm and combined into a cylindrical shape, and the outer periphery is lightly pressed with a pressing die as shown in FIG. The isosceles trapezoidal polygonal columnar bodies are brought into close contact with each other, accommodated in a hot air circulation oven in that state, heated and dried at 130 ° C. for 30 minutes, and the isosceles trapezoidal polygonal columnar bodies are combined, and then the temporary shaft Extracted to obtain a rectangular tube-like combined body having a substantially regular octagonal outer shape. The rectangular tube-like bonded body thus obtained was cut into a length of 215 mm, and a shaft having a diameter of 5 mm and a length of 259.5 mm, to which a hot melt adhesive (product number: HM207, manufactured by Cemedine Co., Ltd.) was applied. (The surface of SUM24L subjected to electroless nickel plating with a thickness of 5 μm) is inserted into the shaft insertion hole after extracting the temporary shaft in the combined body, and the combined body and the shaft are accommodated in a hot-air circulating oven, The hot melt adhesive on the shaft surface was melted by heating at 130 ° C. for 20 minutes, and then cooled to fix the shaft to the bonded body. Thereafter, the surface of the combined body was processed into a cylindrical shape using a cylindrical grinder to obtain a roller of Examples 1 to 3 having an outer diameter of 13.0 mm.

Examples 4 to 6
Of the two parallel sides, one side is 2.3 mm, the other side is 9.8 mm, the lengths of the two hypotenuses are equal, and the angle between the two parallel sides and the hypotenuse is 120 degrees and 60 degrees. Six polygonal columnar bodies were cut out from the slab urethane foams A, B, and C by slit processing, and combined with the six isosceles trapezoidal polygonal columnar bodies (240 mm in length) in the same manner as in Examples 1 to 3. Then, a rectangular tube-like combined body having an outer shape of a substantially regular hexagon is formed, and then the combined body is cut into a length of 215 mm, and the shaft is inserted into the combined body and fixed in the same manner as in Examples 1 to 3. Further, the surface of the combined body was processed into a cylindrical shape to obtain an outer diameter of 13.0 mm to obtain rollers of Examples 4-6.

・ Comparative Examples 1-3
A sheet of slab urethane foam A, B, C cut into a thickness direction with a foaming direction of 500 mm × depth of 250 mm × thickness of 17 mm, a hole having a diameter of 4 mm in the depth direction at a thickness of 1/2 is the surface of the sheet. And opened in parallel. Next, the binder used in Examples 1 to 6 was impregnated into the sheet, and excess binder was squeezed out so that the solid content was 30% by weight with respect to the sheet before impregnation. This sheet was accommodated in a hot-air circulating oven and heated at 130 ° C. for 30 minutes and dried. Thereafter, a prismatic body having a hole at the center was cut out from the sheet. The prismatic body is a square having a length of 240 mm and a cross section of 18 mm on a side. The shaft was inserted and fixed in the hole of this prismatic body similarly to Examples 1-6. Next, the surface of the prismatic body was processed into a cylindrical shape to obtain a roller of Comparative Examples 1 to 3 having an outer diameter of 13.0 mm.

  The rollers of Examples 1 to 6 and Comparative Examples 1 to 3 are attached to a toner cartridge as a toner supply roller, and this toner cartridge is attached to a monochrome laser printer (product number: HL-2040, Brother Industries, Ltd.), 23 ° C., 50% In this environment, 20 sheets of 25% halftone images were continuously printed. Density unevenness is visually determined for the last 20th image, and the image density near the center in the axial direction is reflected by a Macbeth densitometer (product number: RD918, Sakata Inx Corporation) over a length of 100 mm at a pitch of 5 mm. Was measured. The maximum and minimum differences in density unevenness and Macbeth density are as shown in the evaluation result columns of Tables 1 and 2. In the evaluation result column, “roller hardness (1 mm compression) maximum-minimum” indicates that a metal disk with a diameter of 50 mm is pressed against the roller surface so that the disk surface is parallel to the roller axis, and the foam portion is compressed by 1 mm. The maximum value-minimum value of data obtained by measuring the repulsive force at eight points at 45 ° pitch in the circumferential direction of the roller is expressed in mN.

  As shown in the evaluation result column of Table 1, in each of Examples 1 to 6, the halftone image density is uniform, and the difference between the maximum density and the minimum density is about 0.02, whereas Table 2 shows. As described above, in Comparative Examples 1 to 3, the difference between the maximum density and the minimum density was 0.04 to 0.06, and density unevenness was observed in 1/2 cycle (at intervals of about 10 mm). This density unevenness corresponds to the foaming direction of the slab foam and the difference in cell shape and hardness appearing in the direction perpendicular thereto.

  As described above, according to the present embodiment, since the slab foam having excellent physical properties can be used at low cost, physical property values such as hardness and strain and cell shape variation when the roller is rotated in the circumferential direction can be reduced. When used as a supply roller, a cleaning roller for a charging roller, or a transfer roller, a roller capable of obtaining good image quality can be obtained. Furthermore, according to the present invention, there is no need to cut out the urethane foam in a size that allows for a margin from the accuracy when cutting out from the urethane foam as in the past and the accuracy of the drilling position of the shaft insertion hole. The cost can be reduced by reducing it. In addition, although the columnar body was cut out from the slab urethane foam in the said Examples 1-6, even if it cuts out a columnar body from a type | mold foaming urethane foam, the same effect is acquired.

It is a perspective view of the roller concerning one embodiment of the present invention. It is a cross-sectional view of the roller. It is a figure which shows extraction of a columnar body. It is a perspective view which shows at the time of combining and bonding a columnar body in a cylinder shape. It is sectional drawing which shows the time of adhere | attaching a cylindrical body using a pressing die. It is a perspective view which shows the state which combined and adhered the columnar body to the cylinder shape. It is a perspective view in the state where a temporary shaft was removed from a cylindrical coupling object. It is a perspective view at the time of inserting a shaft through a cylindrical coupling body. It is a perspective view of the state where the shaft was inserted in the cylindrical combined object.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Roller 11 Roller body 11A Combined body 13, 13A Columnar body 21 Shaft 21A Temporary shaft 25 Shaft insertion hole

Claims (6)

In a roller with a shaft inserted in the center of a cylindrical roller body made of urethane foam,
The roller main body is formed by bonding a plurality of columnar bodies made of urethane foam by combining them in a cylindrical shape with the length direction of the columnar bodies being the length direction of the roller main body, and processing the surface into a cylindrical shape. A roller characterized by   The foaming direction of the urethane foam constituting the columnar body is a thickness direction of the columnar body, and one side in the thickness direction of the columnar body is in contact with the surface of the shaft. Roller. In the method of manufacturing a roller in which a shaft is inserted into the center of a cylindrical roller body made of urethane foam,
A plurality of columnar bodies formed by cutting out urethane foam are arranged on the outer periphery of the temporary shaft so that the length direction of the columnar bodies is the length direction of the roller main body, combined in a cylindrical shape, and bonded and bonded. Form the
Pulling out the temporary shaft from the combined body, inserting the shaft after pulling out the temporary shaft in the combined body,
A method of manufacturing a roller, characterized in that a surface of the combined body is cylindrically processed to form a roller body. In the method of manufacturing a roller in which a shaft is inserted into the center of a cylindrical roller body made of urethane foam,
A plurality of columnar bodies made of urethane foam are arranged on the outer periphery of the shaft so that the length direction of the columnar bodies is the length direction of the roller body, and combined into a cylindrical shape and bonded to form a combined body. Forming and bonding the combined body and the shaft,
A method of manufacturing a roller, characterized in that a surface of the combined body is cylindrically processed to form a roller body.   The foaming direction of the urethane foam constituting the columnar body is a thickness direction of the columnar body, and the columnar body is combined in a cylindrical shape with one side in the thickness direction of the columnar body inward. The method for producing a roller according to 3 or 4.   The plurality of columnar bodies have the same shape consisting of a polygonal column having an isosceles trapezoidal cross-sectional shape, and the columnar bodies are combined in a cylindrical shape with the short side of the parallel sides of the trapezoid being inward. The method for producing a roller according to any one of 3 to 5.

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