JP3621541B2 - Rubber roller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rubber roller core attached to a shaft core portion of a paper feed roller or the like, and more specifically, does not require a rubber material fitting operation, and allows the paper thickness to be reduced so that the rubber thickness can be reduced. The present invention relates to a core for a rubber roller capable of improving accuracy.
[0002]
[Prior art]
As shown in FIGS. 7 and 8, the conventional rubber roller core “a” is provided with a hole “c” through which the shaft is inserted into the column “b” in the axis, and the rubber material “d” can be fixed to the outer peripheral surface of the column “b”. That is, the rubber roller core a is provided with a groove e on the outer peripheral surface of the cylinder b, and a rubber material d is fitted into the groove e to constitute a rubber roller f. The rubber roller f has a shaft (not shown) fixed to the hole c, and is rotated by a rotational force transmitted from the driving means to the shaft so that the function as a paper feed roller or the like is exhibited. .
[0003]
[Problems to be solved by the invention]
However, since the rubber roller f is for inserting the rubber material d into the groove e on the outer peripheral surface of the cylinder b, it is necessary to insert the rubber material d, and the rubber thickness is the portion embedded in the groove e and the groove e. The part which comes out from the is necessary, and the rubber thickness as a whole is inevitably thick. As a result, the rubber roller f is highly temperature dependent.
[0004]
This temperature dependency is different in the shrinkability of rubber depending on the temperature, and the rubber expands when the temperature becomes high, and the rubber shrinks when the temperature becomes low. Therefore, when the temperature is high, the outer diameter of the rubber roller f increases. When the pressure contact force with the paper is large, that is, when the nip width is large and the paper is double fed, the outer diameter of the rubber roller f is small when the temperature is low, and the pressure contact force with the paper is small, that is, the nip width is Indicates that it will be too small to send paper.
[0005]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rubber roller core that eliminates the need to fit a rubber material, reduces the thickness of the rubber material, reduces temperature dependence, and stabilizes the nip width. .
[0006]
[Means for Solving the Problems]
The present invention has been proposed in order to achieve the above object, and is characterized by having the following configuration. That is,
According to the present invention, in the rubber roller in which the core and the rubber material are integrated by injecting the molten rubber material into the outer peripheral surface of the cylinder of the rubber roller core provided with a hole through which the shaft is inserted into the cylinder. There is provided a rubber roller in which a core and a rubber roller are immovable, wherein a core having a plurality of circular holes formed on a cylindrical outer peripheral surface at a substantially constant interval in the axial direction is used as the core .
[0007]
In addition, according to the present invention, there is provided the rubber roller in which the recess is provided with a notch in the circular hole within an angle range of 5 to 150 degrees from the center.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view of a rubber roller showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG.
In the figure, a rubber roller 1 is formed by adhering a rubber material 3 to a rubber roller core 2. The rubber roller core 2 is provided with a hole 6 through which the shaft 5 is inserted in the cylinder 4 in the shaft core, and the rubber material 3 can be fixed to the outer peripheral surface 7 of the cylinder 4. 8 is provided in the axial direction.
[0009]
As shown in FIGS. 1 and 2, the rubber roller core 2 has a cylindrical portion 10 formed with a hole 6 in the axial center of a cylinder 4, and an axially central portion is formed on the outer peripheral surface of the cylindrical portion 10. A thin portion 11 is extended from the outer peripheral portion of the thin portion 11, and an annular portion 12 is provided concentrically with the cylindrical portion 10. The cylinder 4 is made of 66 nylon resin, polybutylene terephthalate, polyacetal resin, polycarbonate resin, or the like.
[0010]
On the outer periphery of the annular portion 12, that is, on the outer peripheral surface 7 of the column 4, a plurality of concave stripes 8 are provided in the axial direction as described above. The plurality of concave stripes 8, as shown in FIG. 4, vignetting open circular hole 13 on the outer periphery of the annular portion 12 over the entire circumference at regular intervals in the axial direction, all of the circular hole 13 thereof, Figure 3 The cutout 14 is provided within the range of α to β = 5 to 150 degrees shown. The number of the concave stripes 8 is usually 5 to 6 or more, and if it is less than that, the degree of occurrence of flow marks after molding tends to increase. Further, the shape of the recess 8 may be not only a perfect circle like the circular hole 13 but also an ellipse or an ellipse.
[0011]
In a state where the rubber material 3 is fixed to the rubber roller core 2, the rubber material 3 enters the respective recesses 8 in close contact with each other. Therefore, the rubber material 3 does not move in both the axial direction and the circumferential direction of the rubber roller core 2 and can be polished with high accuracy. In the rubber roller 1 of this embodiment, the outer diameter is 15 mm, the thickness of the rubber material 3 is 1.0 mm, and the material used is EPDM (ethylene-propylene rubber) having a hardness of Hs (JIS A) 50 °. ing. The thickness of the rubber material 3 can be manufactured up to about 0.5 mm, and can be reduced to one-eighth compared with the conventional example of 4 mm. Of course, there is an advantage that the outer diameter can be made smaller as a matter of course that the temperature dependency by the rubber material 3 can be avoided.
[0012]
Therefore, according to the present invention, since the rubber material fixed to the outer peripheral surface of the cylinder does not move due to the plurality of axial recesses, it is easy to perform polishing and the like, and can be made as thin as possible. The temperature dependency due to the rubber material is reduced, and the effect that the nip width can be stabilized is exhibited.
Further, as defined in claim 2, a circular hole is formed in the axial direction on the entire periphery of the cylinder, and the concave line is formed by cutting out the circular hole within an angle range of 5 to 150 degrees. The rubber material fixed to the outer peripheral surface of the cylinder does not move due to the above-described concave stripe, and the effect of facilitating processing such as polishing is achieved.
[0013]
Below, the manufacturing method of the rubber roller 1 is demonstrated.
4 and 5, the rubber roller core 2 having a plurality of concave stripes 8 is molded, and the rubber material 3 is integrated with the rubber roller core 2 by injection molding. That is, the rubber roller core 2 is set in the mold. Next, EPDM, which is the rubber material 3 in a heated and melted state, is mainly injected into the plurality of concave strips 8. Thereby, the EPDM in a heated and fluidized state is solidified in the plurality of concave strips 8 and on the outer periphery of the annular portion 12, that is, on the outer peripheral surface 7 of the cylinder 4, and the surface of the EPDM is polished to manufacture the rubber roller 1.
[0014]
C. The injection molding was performed under the conditions of a cylinder temperature of 170 ° C., a mold temperature of 170 ° C., and a curing time of 5 minutes. Therefore, the rubber material 3 can be fixed to the rubber roller core 2 without using an adhesive, so that the fitting work is eliminated, and the rubber material 3 enters the plurality of concave strips 8 and is moved when the surface is polished. Therefore, the rubber roller 1 having a highly accurate outer diameter can be obtained.
[0015]
In the said embodiment, although the concave 8 was comprised from notching 14 within the range of the angle of 5 to 150 degree | times in the circular hole 13, although what was comprised was demonstrated, it is not limited only to this. The shape of the recess 8 may be any shape that prevents the rubber material 3 from moving or dropping in the thrust and circumferential directions when the rubber material 3 is fixed to the rubber roller core 2, for example, square holes, zigzags, etc. A groove may be used.
The number of the circular holes 13 is 24. In this case, the rubber material 3 having a hardness of about JIS 90 ° is used, and when the number of the circular holes 13 is about 8, the JIS A 50 °. It is better to use a material with a certain degree of hardness. That is, when the number of the circular holes 13 is small, a material with low hardness and high fluidity may be used, and when it is large, a material with high hardness and low fluidity may be used.
[0016]
The material of the rubber material 3 is not limited to the above, but styrene / butadiene rubber, butadiene / acrylonitrile rubber, natural rubber, chlorosulfonated polyethylene, silicone rubber, fluorine rubber, chloroprene rubber, urethane rubber, Norbornene, thermoplastic elastomer or the like can be used.
[0017]
【Example】
Next, as an example, a change in outer diameter due to a temperature difference between the rubber roller 1 and the conventional rubber roller having the above-described configuration is measured.
[0018]
<Example 1>
The rubber roller 1 is shown in FIGS. 1 and 2. The rubber roller core 2 is made of 66 nylon resin, the rubber material 3 is made of EPDM having a JIS A hardness of 50 °, and the outer diameter is 20 mm. At 0 ° C., the outer diameter is 15 mm, and the outer diameter is measured at 0 ° C., 10 ° C., 20 ° C., 30 ° C., 40 ° C., and 50 ° C., respectively.
[0019]
<Comparative Example 1>
The rubber roller is as shown in FIGS. 7 and 8, and other conditions and the measuring method are the same as those in the first embodiment. The result is shown in FIG. According to FIG. 6, the change in the outer diameter of the rubber roller was 0.001 mm / ° C. in Example 1, 0.004 mm / ° C. in Comparative Example 1, and a difference of 4 times was obtained.
[0020]
As mentioned above, although embodiment of this invention was described, unless it deviates from the summary of this invention, it is not limited to this.
[0021]
【The invention's effect】
As described in detail above, according to the present invention, the rubber material fixed to the outer peripheral surface of the cylinder does not move or drop due to the plurality of axial recesses, and therefore it is made extremely thin by polishing or the like. As a whole, the temperature dependence of the rubber material is reduced. Therefore, according to this rubber roller core, the outer diameter of the rubber roller is less affected by temperature and the nip width is stable, so that even when used for a paper feed roller or the like, the paper can be fed stably and reliably.
According to the invention of claim 2, a circular hole is formed in the axial direction on the entire periphery of the cylinder, and the concave line is formed by providing a cutout in the circular hole within an angle range of 5 to 150 degrees. Therefore, the rubber material fixed to the outer peripheral surface of the cylinder does not move due to the concave stripe having the shape described above, and the effect of facilitating the processing is achieved.
[Brief description of the drawings]
FIG. 1 is a side view of a rubber roller showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a cross-sectional view illustrating a groove.
FIG. 4 is a side view of a rubber roller core showing an embodiment of the present invention.
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6 is a characteristic diagram showing a temperature change of an outer diameter dimension of a rubber roller.
FIG. 7 is a perspective view showing a conventional example.
FIG. 8 is a cross-sectional view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, f Rubber roller 2, a Rubber roller core 3, d Rubber material 4, b Cylinder 5, Shaft 6, c Hole 7 Outer peripheral surface 8 Groove 10 Tubular part 11 Thin part 12 Annular part 13 Circular hole 14 Notch e Groove

Claims (2)

In a rubber roller in which a molten rubber material is injected into the outer peripheral surface of a cylinder of a rubber roller core having a shaft through which a shaft is inserted, the core and the rubber material are integrated. A rubber roller in which the core and the rubber roller are immovable, wherein a core having a plurality of circular holes provided with a plurality of circular holes provided at substantially constant intervals in the axial direction is used . 2. The rubber roller according to claim 1, wherein the recess is provided with a notch in the circular hole within an angle range of 5 to 150 degrees from the center.

Images