JP3034223B2 - Conveying roller shaft, method of manufacturing the conveying roller shaft, and conveying roller using the conveying roller shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft used as a rotating shaft of a transport roller for OA equipment, a method for manufacturing the shaft, and a transport roller using the shaft.

[0002]

2. Description of the Related Art Conventionally, OA equipment such as a copying machine, a facsimile, a printer and the like are equipped with a sheet conveying device such as a paper feed mechanism. The sheet conveying device is provided with a plurality of conveying roller pairs, and the conveying roller pairs are driven by a driving roller that is driven to rotate by being transmitted with a driving force, and a driven roller that is pressed against the driving roller and driven to rotate. It is configured. The roller on the driving side of the pair of transport rollers functions as a platen, and therefore generally has a rigid metal columnar roller (stainless steel, aluminum, etc.) or a rubber or resin coated on the peripheral surface of the metal roller. And those obtained by subjecting a peripheral surface of a metal roller to a blast treatment. As the driven-side roller, a roller made of various materials such as metal, rubber, and resin is used, and not limited to a columnar roller, a roller having a disk shape or a spur type may be used.

The cylindrical metal roller on the driving side generally includes a shaft serving as a rotating shaft, a cylindrical pipe, and a bush for fixing the shaft to the cylindrical pipe. The material of the shaft is free-cutting steel (SUM2
4L) is used, and a custom-made metal wire rod that has been subjected to a drawing treatment of this free-cutting steel, and then heat-treated and tempered is used.

Here, a description will be given of a manufacturing process of the shaft and an assembling process of the transport roller with reference to FIG. The custom-made metal wire is manufactured as follows. That is, a metal wire (free-cutting steel) 51 wound into a roll is used (step). The metal wire 51 is fed out and drawn by a drawing machine (not shown) to pull the metal wire 51 in the axial direction through a die 52 in a cold state to produce a metal drawing wire 53 having a reduced outer diameter. Metal drawing wire 53 after drawing
Is wound again in a coil shape (step). Next, the metal drawn wire 53 wound in the coil shape is fed out and subjected to heat treatment (annealing) in a heat treatment device 54 to produce a metal heat treated wire 55. The metal conditioning wire 55 is wound again into a coil after cooling (step). Generally, a component processing maker purchases the metal refining wire 55 from which distortion has been removed in advance in this way and processes it into a shaft.

A process for manufacturing a shaft by using the metal conditioning wire 55 will be described. The metal conditioning wire 55 wound in a coil shape is fed out and passed through a cutting machine 56 to a predetermined length in the axial direction (for example, 3 m). ) To produce a shaft member 57 (step). Next, the shaft material 57 after cutting is set in the NC automatic machine 58 and turning is performed.
Further, the outer diameter polishing machine 59 is set to perform outer diameter polishing. Then, the shaft 60 is manufactured by performing electroless nickel plating if necessary (process).

When assembling the conveying roller using the shaft 60, the conveying roller 62 is assembled by inserting the shaft 60 into the shaft hole of the cylindrical pipe 61 and press-fitting the bush into the openings on both sides. (Process). Next, a shaft 60 extending to both sides of the transport roller 62 is provided.
While the shaft is supported by bearings A and B, the cylindrical pipe 61 is bent by applying a pressing force P from a direction perpendicular to the axial direction (step). Then, finally, the outer peripheral runout accuracy is inspected, and the transport roller 62 is manufactured (process).

[0007]

However, the shaft 60 formed by machining using the metal refining wire 55 accumulates the residual distortion of the material and the distortion of the part processing. After assembly, the shaft 60 bends due to aging and the use environment (including environmental tests).
Distortion and the like are likely to occur, and the fitting portion between the components may be loosened (see FIG. 5A). In this case, the shaft 6
It is necessary to correct the bend of 0 or a defective product is generated, the yield is reduced, and the quality of the shaft 60 is reduced. Also,
The metal tempering wire 55 is more expensive (more than three times) than the metal drawing wire 53 before tempering, and the production cost of the transport roller 62 also increases. Further, as shown in FIG. 5B, the quality of the conveyance roller 62 is such that the deflection of the outer periphery of the arrow a portion of the shaft 60 with respect to the bearings A and B on both sides of the shaft 60 is (10/100 mm) or less. , Cylindrical pipe 61
Is required to be kept at (1/100 mm) or less on the outer periphery of the arrows b, c, d. The transport roller 6
In the case where the second shaft 60 is bent, FIG.
As shown in FIG.
The outer peripheries of the arrows b, c, d of FIG. 1 and the arrows a, e at both ends of the shaft 60 occur, and the quality characteristics cannot be maintained. Therefore, the transport performance of the transport roller 62 is significantly reduced.

An object of the present invention, the solve the problems of the prior art, bending hardly occurs due to changes in aging or the use environment, inexpensively manufacturable conveying roller shaft, the conveyance b
The object of the present invention is to provide a method of manufacturing a roller shaft, and a transport roller having high runout accuracy by using the transport roller shaft.

[0009]

The present invention has the following arrangement to achieve the above object. That is, a shaft material obtained by cutting a metal wire obtained by drawing a metal wire using free-cutting steel into a predetermined length is machined without leaving a polished portion on the outer periphery without tempering. The heat treatment is performed on the central portion in the axial direction, and annealing is performed, and the outer peripheral polishing portion is polished. After the polishing, the surface may be plated with metal. In the case of a transport roller using a transport roller shaft, the shaft is inserted through a shaft hole of a cylindrical pipe,
It is characterized in that the cylindrical pipe is integrally fixed via bushes that are press-fitted from both side openings. In addition, transport Russia
As a method of manufacturing a shaft for a roller, a shaft material obtained by feeding a metal wire using free-cutting steel wound into a roll and drawing the metal wire to a predetermined length is obtained. In the method of manufacturing a shaft for a conveying roller using a method, a first processing step of machining the shaft material and polishing the outer diameter while leaving a polished portion on the outer periphery, and performing a heat treatment on a central portion of the shaft material to remove residual strain And a second processing step of finally polishing a polished portion on the outer periphery of the shaft material after annealing. Further, in the annealing step, a cooling step of cooling the shaft material after the heat treatment may be included, or after the second processing step, a metal plating step of performing metal plating on the polished shaft material surface may be included. May be.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In this embodiment, a metal shaft used as a driving-side metal roller used as a part of a paper feed mechanism in an OA device such as a printer will be described as an example of a shaft. FIG. 1 is an explanatory view showing a manufacturing process of a metal shaft and a transport roller, FIG. 2 is an explanatory view showing a thermal conditioning process of the metal shaft, and FIG. 3 is a bent portion of the metal shaft, a heat-treated portion of the metal shaft and a run-out of the transport roller. FIG.

First, the manufacturing process of the metal shaft and the transport roller will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a metal wire wound up in a roll shape as a raw material, and a long metal wire 1 such as free-cutting steel (SUM24L) is used (step). The metal wire 1 is subjected to cold drawing through a die 2 by a drawing machine (not shown) by a material maker to produce a metal drawn wire 3 drawn to a predetermined diameter (for example, φ6 mm to φ20 mm) (process). ). The metal drawing wire 3 is wound up again in a roll shape after processing. Next, the metal wire 3 wound up in the form of a roll is fed out and cut by a cutting machine 4 to a predetermined length (for example, 60 mm to 600 mm) to produce a shaft member 5. The shaft material 5 thus cut is purchased from a material manufacturer, and the manufacturer manufactures the shaft (process). As described above, by using a material that has not been heat-treated (tempered) as in the related art, the material cost can be reduced.

Using the shaft member 5, an NC automatic machine 6
, And then a first processing step is performed in which the outer diameter is polished by an outer diameter polishing machine 7 while leaving a polished portion (5/100) μm on the outer periphery (step).

Next, the central portion 30 mm of the shaft member 5
An annealing step is performed to partially remove the residual strain by performing a partial heat treatment using the high-frequency heating apparatus 8 in a range of about 80 mm (step). The annealing step will be described. As shown in FIG. 2, the shaft material 5 is partially annealed while being transported by using the high-frequency heat treatment apparatus 8. That is, a plurality of shaft members 5 are placed on the inclined table 9, rolled downward while rotating the slope, and fed into the high-frequency heating unit 10. The high-frequency heating section 10 can be arranged so that only a portion of the shaft material 5 to be heat-treated can be partially heated in the axial direction. While the shaft 5 rotates,
When passing through the high-frequency heating unit 10, the heat treatment is performed uniformly at about 180 ° C. for about 2 hours, so that the refining is performed.
Residual distortion can be effectively removed. Thereafter, after the required heat treatment is completed, a cooling step of dropping into the cooling tank 11 for cooling is performed. As the refrigerant stored in the cooling tank 11, air cooling, water cooling, oil cooling, or the like may be used depending on the specifications of the product.

The shaft material 5 cooled after the annealing is again subjected to the outer diameter polishing machine 7 to grind the outer peripheral polishing portion (5/10).
0) A second processing step of final polishing and finishing the μm is performed. As a result, the shaft diameter can be finished to a runout accuracy of a micron unit.

Next, a metal plating step of applying a metal plating such as electroless nickel plating to the surface of the polished shaft member 5 is performed, whereby the appearance is finished and corrosion is prevented, whereby the shaft 12 is obtained. The shaft 12 has a high bending accuracy so as to withstand a change with time and a change in a use environment (including an environmental test), and a product having a high yield in a manufacturing process can be obtained. As shown in the prior art, a shaft that has been heat-treated (tempered) in advance is likely to bend due to a change over time or a change in a use environment (see FIG. 5A), but as shown in FIG. A part that bends easily after processing (Fig. 3 (a)
The shaft 12 that has been heat-treated on the wavy line portion) hardly bends, and can maintain the outer peripheral runout with high accuracy.

When a transport roller is manufactured using the shaft 12, as shown in FIG.
The shaft 12 is inserted into a shaft hole of a cylindrical pipe 13 made of a metal material such as stainless steel or aluminum, and a bush (not shown) is press-fitted from both sides of the cylindrical pipe 13 to be integrally fixed and assembled. After that, the cylindrical pipe 13 is polished by an outer diameter polishing machine 14 on the basis of the bearings on both sides to perform polishing (step). Then, finally, a quality inspection such as a run-out of the outer periphery is performed to obtain the transport roller 15 (process).

As shown in FIG. 3B, when the shaft 12 is bent, the bearings A and B are
Bending is likely to occur in the directions of the arrows f, g, and h, and outer peripheral deflection occurs at both ends and the center of the shaft, so that the carrying performance of the carrying roller 15 is reduced. Therefore, a step of correcting the bending of the transport roller 15 is required.

On the other hand, as described above, when the transport roller 15 is assembled and constructed using the shaft 12 that has been subjected to the tempering after machining, as shown in FIG. This makes it possible to keep the deflection of the arrows b, c, d of the cylindrical pipe 13 at (12/1000) mm or less, to omit or simplify the bending correction step, and to obtain the transport roller 15 with high quality characteristics. be able to.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. For example, the length and diameter of a shaft can be applied to various types. In addition, the conveying roller using the shaft is not limited to the metal roller, but may be a resin roller or the like, and may be not only the driving roller but also a driven roller. It goes without saying that many modifications can be made without departing from the scope of the invention.

[0020]

EFFECTS OF THE INVENTION The shaft for the conveying roller of the present invention and its shaft
According to the manufacturing method, a shaft material obtained by cutting a metal wire using free-cutting steel into a predetermined length from a metal wire obtained by drawing a metal wire is machined by leaving a polished portion on the outer periphery without tempering. subjected, annealing by heat treatment in the axially central portion, so to form a shaft finished by grinding the polishing portion of the outer peripheral hardly occurs bent by a change in the change over time or usage environment, shea
The deflection accuracy of the shaft can be finished with high accuracy, the yield in the manufacturing process is good, and the material cost is low, so that the manufacturing cost can be reduced. In the case of a transport roller using a transport roller shaft , a shaft reference
By performing the polishing finish, the run-out accuracy of the roller outer circumference can be maintained at a high accuracy of the order of microns, and the outer circumferential run-out is less likely to occur due to aging or changes in the use environment. A high conveying roller can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a manufacturing process of a metal shaft and a transport roller.

FIG. 2 is an explanatory view showing a heat treatment step of a metal shaft.

FIG. 3 is an explanatory view showing bending of a metal shaft, a tempered portion of the metal shaft, and run-out of a transport roller.

FIG. 4 is an explanatory view showing a manufacturing process of a conventional metal shaft and a transport roller.

FIG. 5 shows a conventional bending of a shaft, deflection of a conveying roller,
FIG. 4 is an explanatory diagram of assembly accuracy required for a transport roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal wire 2 Dice 3 Metal drawing wire 4 Cutting machine 5 Shaft material 6 NC automatic machine 7, 14 Outside diameter polishing machine 8 High frequency heat treatment device 9 Inclined table 10 High frequency heating part 11 Cooling tank 12 Shaft 13 Cylindrical pipe 15 Conveying roller

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 5/06 C21D 9/00-9/44 C21D 9/50

Claims (6)

(57) [Claims] A shaft material obtained by cutting a metal wire obtained by drawing a metal wire using free-cutting steel into a predetermined length is machined without leaving a polished portion on the outer periphery without tempering. Wherein a central portion in the axial direction is subjected to heat treatment and annealed, and the outer peripheral polishing portion is polished and finished .
Shaft for roller. 2. The shaft for a transport roller according to claim 1, wherein a metal plating is applied to a surface after the polishing finish. 3. The transport roller according to claim 1, wherein
A conveying shaft formed by inserting a shaft for use into a shaft hole of a cylindrical pipe and integrally fixing the bush through press-fitting through openings on both sides of the cylindrical pipe. 4. A shaft material obtained by feeding a metal wire using a free-cutting steel wound in a roll shape and drawing the metal wire to a predetermined length. transportable using
In a method for manufacturing a shaft for a feed roller, a first processing step of performing machining on the shaft material and polishing an outer diameter while leaving a polishing portion on an outer periphery; and performing a heat treatment on a central portion of the shaft material to reduce residual strain. A conveying row , comprising: an annealing step of removing; and a second processing step of final polishing the polished portion of the outer periphery of the shaft material after the annealing.
Manufacturing method of shaft for rubber. 5. The annealing step, the manufacturing method of the transfer roller shaft according to claim 4, characterized in that it has a cooling step of cooling the shaft member after heat treatment. 6. The transfer method according to claim 4, further comprising, after the second processing step, a metal plating step of performing metal plating on the polished shaft material surface .
Manufacturing method of shaft for roller.