JP2002087630A - Sheet conveying roller and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet conveying roller having an excellent rustproof effect and excellent rigidity. SOLUTION: This sheet conveying roller 1 is equipped with a shaft rod 2 and a gear 3. The shaft rod 2 has a core bar 21 made of metal and a coating material 22. The covering material 22 covers the circumference of the core bar 21. Stainless steel, for example, is used as a material for the core bar 21. As for its shape, it is formed into a columnar shape having a diameter of about 8 mm and a length of about 200 mm to 300 mm, for example. Polyoxymethylene, for example, is used as a material for the coating material 22. The wall thickness of a cylindrical portion of the coating material 22 covering the core bar 21 is about 2 mm to 3 mm. The gear 3 is formed on one end part of the shaft rod 2. The core bar 21, the coating material 22, and the gear 3 are concentrically disposed. Thus, the shaft rod 2 has the core bar 21 therewithin and its surface material is the resin having a high rustproof effect, and therefore, the rigidity and rustproof effect of the roller 1 are enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying roller which is a component of office equipment, for example, a printer, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As shown in FIG. 5, for example, a conventional sheet conveying roller is made of a highly rigid material, for example, a metal material, and is provided with a metal core bar which has been subjected to plating and painting surface processing, and For example, a gear formed of a material such as plastic is manufactured and assembled. The sheet transport roller manufactured in this way is used as a component of an apparatus having a sheet transport function, for example, a printer.

FIG. 9 shows a state in which the sheet conveying roller 1 is used as one of the components of a printer. As shown in FIG. 9, when the sheet conveying roller 1 of the printer rotates, the paper 6 is sucked by the shaft of the sheet conveying roller 1 and the passive roller 5, and is conveyed toward a printing unit (not shown).

[0004]

However, in the conventional method of manufacturing a sheet conveying roller, when a gear is assembled to a metal core, a device for preventing slippage between the gear and the metal core is used. is necessary. When the sheet transport roller is used as a component of a printer, for example,
When slippage occurs between the gear and the metal core, the rotation of the gear and the metal core is not synchronized, which causes a problem such as poor printing or paper jam. Therefore, for example, as shown in FIG. 8, a non-slip pin 83 is provided at a connection portion between the metal core 81 and the gear 82, and the metal core 81 and the gear 82 are fixed to prevent slip.

As shown in FIG. 9, for example, when the paper 6 is conveyed, the paper 6 comes into contact with the surface of the metal core 21, so that the metal core 21 has a surface for preventing rust. Processing, such as plating or painting, is required.

However, the conventional method of manufacturing a sheet conveying roller has the following problems.

The first problem is the problem of the adhesion of the plating material applied to the metal core to prevent rust of the metal core. Generally, the adhesion of the plating material is weak, so that after a long time, the plating material is lost from the surface of the metal core by friction or impact. The second problem is that a special component is required to prevent slippage between the metal core and the gear. Not only the management of parts becomes complicated, but also the manufacturing process becomes complicated and expensive.

Accordingly, it is a primary object of the present invention to provide a sheet conveying roller which is excellent in rust prevention effect and excellent in rigidity. It is another object of the present invention to provide a method for manufacturing a sheet conveying roller in which the types of constituent parts are reduced, the parts are easily managed, and the manufacturing process is simplified.

[0009]

According to a first aspect of the present invention, there is provided a sheet conveying roller including a resin shaft rod and a gear connected to one end of the shaft rod. The shaft has a metal core inside. Therefore,
Since the surface is made of a material with excellent rust prevention and the inside is made of a material with excellent rigidity, the rust prevention effect and rigidity of the sheet conveying roller are enhanced.

According to the sheet conveying roller of the second aspect of the present invention, the metal core is made of stainless steel. Therefore, the rigidity of the sheet conveying roller is increased. According to a third aspect of the present invention, there is provided a sheet conveying roller including a resin shaft rod and a gear connected to one end of the shaft rod. Therefore, since a material excellent in rust prevention is used for the surface, the rust prevention effect of the sheet conveying roller is enhanced.

According to the sheet conveying roller of the present invention, the covering material is made of polyoxymethylene. Therefore, since a material excellent in rust prevention is used, the rust prevention effect of the sheet conveying roller is enhanced.

According to the sheet conveying roller of the present invention, the shaft has a thermosetting acrylic resin film containing alumina around the shaft. Therefore, since the sheet conveying roller has an appropriate surface roughness required for conveying the sheet, the roughness of the sheet conveying roller increases.

According to a sixth aspect of the present invention, there is provided an office machine comprising the sheet conveying roller according to any one of the first to fifth aspects. Therefore, the durability of the office equipment is increased because the sheet conveyance roller having excellent rust prevention and rigidity is used.

According to a seventh aspect of the present invention, there is provided a method of manufacturing a sheet conveying roller, wherein a material of a shaft rod and a material of a gear are poured into a molding die to perform molding.
Therefore, the number of types of constituent parts can be reduced, parts can be easily managed, and the manufacturing process can be simplified, so that the productivity and quality of the sheet conveying roller can be improved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) As shown in FIG. 1, a sheet conveying roller 1 according to a first embodiment of the present invention comprises a shaft 2 and a gear 3.
It has. The shaft 2 has a metal core 21 and a coating material 22, and the coating material 22 covers the metal core 21. The shape of the shaft 2 is, for example, about 10 mm in diameter.
It is formed in a cylindrical shape having a length of about 15 mm and a length of about 200 mm to 300 mm. As a material of the metal core 21, for example, stainless steel is used, and the shape is, for example, a cylindrical shape having a diameter of about 8 mm and a length of about 200 mm to 300 mm. The shape of the metal core 21 is not limited to a columnar shape, and may be a prism having a polygonal bottom surface or a slightly distorted shape, and precise linearity is not required. Coating material 22
For example, polyoxymethylene is used as the material. The thickness of the cylindrical portion where the coating material 22 covers the metal core 21 is approximately 2 mm to 3 mm.

A gear 3 is formed at one end of the shaft 2. The gear 3 has a disk shape having a diameter of about 60 mm and a thickness of about 3 mm to 10 mm, and a metal core 21 and a coating material 22 penetrate the center of the gear 3. As shown in FIG. 2, the metal core 21, the coating material 22, and the gear 3 are arranged concentrically.

Therefore, the metal core 2 is provided inside the shaft 2.
1, the rigidity of the sheet conveying roller 1 is increased. Further, since the surface of the sheet conveying roller 1 is made of resin and is made of a material having excellent rust prevention, the rust preventing effect of the sheet conveying roller 1 is enhanced.

Further, the surface of the shaft 2 is coated with a thermosetting acrylic resin containing alumina, so that the surface roughness can be further optimized. When the sheet conveying roller 1 is used in, for example, a printer and conveys paper, the surface of the shaft 2 needs to have an appropriate surface roughness. As shown in FIGS. 6 and 7, the sheet conveying roller 1 of the printer rotates, and at the same time, the shaft 2 rotates. Then, the paper 6 is sucked by the shaft rod 2 and the passive roller 5, and is conveyed toward a printing unit (not shown). Since the surface of the shaft 2 has an appropriate surface roughness, printing defects due to paper misalignment can be prevented.

(Second Embodiment) As shown in FIG. 3, a sheet conveying roller 1 according to a second embodiment of the present invention is entirely formed of a uniform material. As the material, for example, polyoxymethylene is used. You. The appearance is the same as that of the sheet conveying roller of the first embodiment of the present invention, and the shape of the shaft 2 is, for example, about 10 mm to 30 mm in diameter and about 20 mm in length.
It is formed in a cylindrical shape of 0 mm to 300 mm. Shaft 2
Is preferably larger than the diameter of the sheet conveying roller according to the first embodiment of the present invention in order to maintain a constant strength.

A gear 3 is formed at one end of the shaft 2. The shape of the gear 3 is a disk having a diameter of about 60 mm and a thickness of about 3 mm to 10 mm. As shown in FIG. 4, the shaft 2 and the gear 3 are arranged concentrically.

Therefore, since the sheet conveying roller 1 is entirely formed of a uniform material, it can be integrally formed, and the productivity of the sheet conveying roller 1 is improved.
Further, since the surface of the sheet conveying roller 1 is made of resin and is made of a material having excellent rust prevention, the rust preventing effect of the sheet conveying roller 1 is enhanced.

(Third Embodiment) A usage example in which the sheet conveying rollers according to the first and second embodiments of the present invention are applied to a printer will be described with reference to FIGS. FIG. 5 is a view schematically showing a sheet conveying roller according to the first embodiment and the second embodiment of the present invention. In appearance, there is little difference from the conventional sheet conveying roller.

As shown in FIG. 6, the sheet conveying roller 1 according to the first and second embodiments of the present invention is rotatably supported by a bearing base 4. Both ends of the metal core 1 are connected to the bearing base 4. Further, a passive roller 5 is provided in parallel with the upper part of the shaft 2 of the sheet conveying roller 1.
Is provided. The end of the passive roller 5 is the bearing base 4
Is rotatably connected to the As the material of the passive roller 5, for example, the same material as that used for the sheet conveying roller 1 may be used.

As shown in FIGS. 6 and 7, the sheet conveying roller 1 of the printer rotates, and at the same time, the shaft 2 rotates. Then, the paper 6 is sucked by the shaft rod 2 and the passive roller 5, and is conveyed toward a printing unit (not shown). Since the surface of the shaft 2 has an appropriate surface roughness, printing defects due to paper misalignment can be prevented.

Accordingly, the durability and reliability of the printer are improved because the sheet conveying roller 1 which is excellent in rust prevention and rigidity and has an appropriate surface roughness is used. The third embodiment of the present invention has been described with reference to an example in which the present invention is applied to a printer. However, the sheet conveying roller of the present invention can be used as a sheet conveying roller of a device having a sheet conveying function such as a copier, a facsimile, and an image scanner.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a sheet conveying roller according to a first embodiment of the present invention.

FIG. 2 is a side view showing a sheet conveying roller according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a sheet conveying roller according to a second embodiment of the present invention.

FIG. 4 is a side view illustrating a sheet conveying roller according to a second embodiment of the present invention.

FIG. 5 is a schematic view showing a sheet conveying roller according to a first embodiment, a second embodiment, and a prior art of the present invention.

FIG. 6 is a schematic view showing an example of use of a sheet conveying roller according to the first and second embodiments of the present invention.

FIG. 7 is a schematic diagram illustrating an example of use of a sheet conveying roller according to the first and second embodiments of the present invention.

FIG. 8 is a cross-sectional view illustrating a conventional sheet conveying roller.

FIG. 9 is a schematic diagram illustrating an example of use of a conventional sheet conveying roller.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheet conveying roller 2 shaft rod 3 gear 4 bearing stand 5 passive roller 6 paper 21 metal core 22 coating material 81 metal core 82 gear 83 pin

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65G 39/10 B65G 39/10 F16C 13/00 F16C 13/00 AE Term (Reference) 3F033 BB01 BC02 GB08 GC04 HA01 3F049 AA10 CA14 CA16 DA11 DA12 LA07 LB03 3J103 AA02 AA14 AA23 AA33 AA51 AA74 AA83 BA34 CA03 CA13 CA62 CA78 EA02 EA05 FA03 FA05 FA11 FA12 FA15 GA02 GA52 GA58 HA03 HA04 HA05 HA06 HA15 HA33 HA41 4EB0 DC22

Claims (7)

[Claims] 1. A sheet conveying roller used in an apparatus having a function of conveying a sheet, comprising: a resin shaft having a metal core therein; and one end connected to the shaft. A sheet conveying roller comprising: 2. The sheet conveying roller according to claim 1, wherein the metal core is made of stainless steel. 3. A sheet conveying roller for use in an apparatus having a function of conveying a sheet, comprising: a resin shaft rod; and a gear connected to one end of the shaft rod. A sheet conveying roller. 4. The sheet conveying roller according to claim 1, wherein the shaft bar is made of polyoxymethylene. 5. The sheet conveying roller according to claim 1, wherein the shaft bar is formed with a thermosetting acrylic resin film containing alumina around the shaft bar. 6. An office machine comprising the sheet conveying roller according to claim 1. Description: 7. The method for manufacturing a sheet conveying roller according to claim 1, wherein a material of a shaft and a material of a gear are poured into a molding die, and the molding is performed. Applying a thermosetting acrylic resin containing alumina to the material formed by the method described above.