JPH1045305A - Carrying roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of carrying capacity, to stably and surely carry a paper despite long time use or temperature change. SOLUTION: In a carrying roller 10 wherein a shaft 16 is inserted into a roller main body 11 having an elastic layer 12 in the outer periphery, the elastic layer 12 is composed of two layers of an inner side elastic layer 13 and an outer side elastic layer 14 softer than the layer 13; locking pins 15, along the neary diameter direction of a roller main body, are dispersedly buried in the layer 14; and the tips of the locking pins 15 are made so as to be protruded from the surface of the layer 14 due to the surface deformation of the layer 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transport roller.

[0002]

2. Description of the Related Art In office equipment such as a fax machine and a printer, paper is generally transported by a transport roller having a shaft inserted through a roller body made of an elastic material such as rubber or polyurethane. The transport roller feeds out the paper by a frictional force generated between the roller body and the paper.

However, when the roller main body is made of an elastic material, the roller main body is worn over time or paper dust adheres to the surface of the roller main body, and it is difficult to obtain a desired frictional force. May occur. Further, when used at a low temperature, the elasticity of the roller body is reduced, so that a constant paper transport ability may not be obtained. Therefore, it is conceivable to soften the elastic body that constitutes the roller body, increase the adhesion to paper, and suppress curing at low temperatures, but not only is the roller body easily worn,
There was a possibility that the paper was stained by friction with the roller body.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve such a problem. Even if there is a long-term use or a change in temperature, the paper carrying capacity is not deteriorated. An object of the present invention is to provide a novel conveyance roller capable of stably and surely conveying.

[0005]

That is, the present invention provides:
In a transport roller in which a shaft is inserted through a roller body having an elastic layer on its outer periphery, the elastic layer is composed of an inner elastic layer and an outer elastic layer softer than the inner elastic layer, and the outer elastic layer has a substantially radial direction of the roller body. Are buried in a dispersed manner, and the tip of the locking pin projects from the surface of the outer elastic layer due to the surface deformation of the outer elastic layer.

[0006]

The transport roller of the present invention has two elastic layers, an inner elastic layer and an outer elastic layer which is softer than the inner elastic layer. Lock pins are dispersed and embedded in the outer elastic layer. Therefore, when the roller body is pressed against the paper surface, the locking pin is supported by the inner elastic body inside the roller body, and the pin tip protrudes from the deformed outer elastic layer. Therefore, even if the roller body is worn out or paper dust adheres, the paper can be reliably sent out, and a stable paper transport ability can be obtained regardless of the temperature change and the surface condition of the paper. it can.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing an example of the transport roller of the present invention, FIG. 2 is an enlarged sectional view taken along line 2-2, FIG. 3 is a sectional view showing the operation of the present invention, and FIG. FIG. 5 is a cross-sectional view of a forming die showing a manufacturing example of the outer elastic layer.

As shown in FIGS. 1 and 2, the transport roller 10 in this embodiment has a shaft 16 inserted through a roller body 11.

The roller main body 11 is formed in a columnar shape having an appropriate length and diameter according to the width of the paper to be conveyed, and has an elastic layer 12 on the outer periphery. In the present embodiment, the center of the roller body 11 is constituted by a core material 17 made of a hard resin,
An elastic layer 12 is provided on the outer periphery. The outer diameter of the roller body 11 of the present example is formed to be 16 mm.

The elastic layer 12 is a portion for transporting the sheet by a frictional force generated by the contact pressure with the sheet, and is composed of two layers, an inner elastic layer 13 and an outer elastic layer 14. The inner elastic layer 13 is made of a material having an Asker hardness C type and about 10 ° or more higher than an elastic body constituting the outer elastic layer 14 described later, and a locking pin 15 embedded in the outer elastic layer 14.
Is supported from the roller body 11 side. This inner elastic layer 13
Is preferably a solid or foam of chloroprene rubber, ethylene-propylene rubber, or urethane elastomer. In this embodiment, the chloroprene rubber has a hardness of about 60 °.

On the other hand, the outer elastic layer 14 is
When the sheet comes into contact with and is pressed against the sheet, it rubs against the sheet to facilitate feeding of the sheet, and at the same time, is compressed and deformed by the pressing, and the tip of the locking pin 15 buried inside is brought into contact with the surface of the transport roller 10. As described above, it is important that the inner elastic layer 13 is formed of a soft material whose hardness is lower than that of the inner elastic layer 13 by 10 ° or more. A preferable material for the outer elastic layer 14 is an elastic body such as urethane foam, chloroprene rubber, ethylene-propylene rubber, butadiene rubber, isoprene rubber, and in this example, urethane foam having a hardness of 30 °. The thickness of the outer elastic layer 14 is
It can be made appropriate depending on the diameter and the conditions of use. In this embodiment, it is 5 mm.

Note that the roller body 11 is
The entire roller body 11 may be constituted by the elastic layer 12 depending on the size of the elastic layer 12 and the elasticity of the elastic layer 12. FIG. 4 shows an example. Reference numeral 10a in the drawing denotes a transport roller, 1
1a is a roller body, 12a is an elastic layer, 13a is an inner elastic layer, 14a is an outer elastic layer, 15a is a locking pin, 16a is a shaft, and 18a is a groove.

When the outer elastic layer 14 is compressed and deformed by the pressing of the transport roller 10, the locking pin 15 protrudes from the roller surface and hooks the sheet to ensure smooth and reliable transport. As shown in FIG. 2, the roller body 11 is buried dispersedly along a substantially radial direction of the roller body 11. The locking pin 15 is not particularly limited, but preferably has excellent rigidity, flexibility, abrasion resistance, etc., and is made of steel whose hardness is increased by carburizing and quenching,
Those made of SUS303 and quenched are preferred. In addition, the length of the locking pin 15 is
It is appropriate depending on the thickness of the roller, but the length is such that the tip of the pin does not appear on the roller surface when the pressure is not applied to the transport roller 10. In this embodiment, φ0.5 mm, length 5
mm needle member is used.

The needle member has a holding plate 19 formed on the base side thereof. When the outer elastic layer 14 is manufactured, the holding plate portion 19 stabilizes the locking pin 15 in the mold, and after the product is manufactured, the locking pin 15 may fall off the outer elastic layer 14. The locking pin 15 stands substantially vertically from substantially the center thereof. The operation of the holding plate 19 during molding will be described later.

Further, a groove 18 for dividing the surface of the outer elastic layer 14 into a plurality of parts is formed on the surface of the outer elastic layer 14 of the present embodiment. The groove 18 is provided in the conveying roller 1 for the sheet.
0, the amount of deformation of the outer elastic layer 14 caused by the pressing is increased, and the leading end of the locking pin 15
This has the effect of making it protrude easily from the zero surface. In addition, since the outer elastic layer 14 can be deformed with a small force, thin paper and paper having a smooth surface can be reliably conveyed.

The shaft 16 is not particularly defined, and in this embodiment, a SUS308 round bar having a diameter of 6 mm is used.

The transport roller 10 having such a configuration
As shown in FIG. 3, when the outer elastic layer 14 comes into contact with the paper P, the pressure causes the outer elastic layer 14 to deform, and the tip of the locking pin 15 projects from the surface of the roller body 11. Then, since the paper P is hooked by the tip of the pin 15 while rotating, the paper P can be reliably sent out together with the frictional force of the outer elastic layer 14.

In the transport roller 10, the outer elastic layer 14 is formed in a planar shape in advance, and the shaft 16 is inserted in advance and wound around the surface of the inner elastic layer 13 of the roller body having a roller shape, and is fixed with an adhesive or the like. It can be obtained by: FIG. 5 shows a production example of the outer elastic layer 14.
Reference numeral 20 in the figure denotes a casting mold, and 21 and 22 denote injection molds, each having a cavity C formed in the shape of the outer elastic layer 14. As shown, the mold surface of one injection mold 21 includes:
Projection 23 for forming groove 18 on the surface of outer elastic layer 14
Is protruding. On the other hand, in the other injection mold 22, a large number of magnets M for erected and holding the locking pin 15 in the cavity C are embedded. Reference numeral 24 is an injection port for molding material. Since the locking pin 15 is disposed in the section of the outer elastic layer 14 defined by the groove 18, the magnet M is provided in a position where the magnet M does not face the projection 23.

Then, the holding plate 19 of the locking pin 15 is held by the magnet M of the lower mold 22 by its magnetic force, and the locking pin 15 is formed in the cavity C. In that state,
A predetermined molding material 25 for forming the outer elastic layer 14 is injected from the injection port 24, and a flat elastic body is formed integrally with the locking pin 15. After the mold is released, the outer elastic layer 14 is adhered and fixed to the surface of the inner elastic layer 13 made of hard rubber or the like provided in advance on the outside of the shaft 16 with an adhesive or the like.

[0020]

As shown and described above, according to the transport roller of the present invention, the outer elastic layer is deformed by the contact with the paper, and the tip of the locking pin embedded inside projects from the roller surface, Because the pin hooks and transports the paper when the roller rotates, the paper is transported reliably because the hooking force of the locking pin acts in addition to the frictional force generated between the elastic layer and the paper. Can do it. In addition, it is possible to reliably feed a sheet whose surface is smooth and may not be reliably conveyed only by the frictional force with the elastic body. Further, even when paper powder adheres to the roller surface due to use over time, or even when used at a low temperature, a sufficient paper conveyance ability can always be obtained. Further, in the case where the outer elastic layer is provided with a groove, the outer elastic body can be deformed with a small pressing force, so that accurate paper feeding can be performed even with thin paper.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a transport roller of the present invention.

FIG. 2 is an enlarged sectional view taken along the line 2-2.

FIG. 3 is a sectional view showing the operation of the present invention.

FIG. 4 is a side view in which a main part showing another example of the present invention is a sectional view.

FIG. 5 is a sectional view of a molding die showing an example of manufacturing an outer elastic layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Conveyance roller 11 Roller main body 12 Elastic layer 13 Inner elastic layer 14 Outer elastic layer 15 Lock pin 16 Shaft 18 Groove

Claims (2)

[Claims] 1. A transport roller in which a shaft is inserted through a roller body having an elastic layer on its outer periphery, wherein the elastic layer comprises an inner elastic layer and an outer elastic layer softer than the inner elastic layer. Locking pins along a substantially radial direction of the main body are dispersed and embedded, and the tip of the locking pin projects from the surface of the outer elastic layer by pressing the surface of the outer elastic layer. Transport rollers. 2. The conveyance according to claim 1, wherein a groove is formed in the outer elastic layer to divide at least the surface of the outer elastic layer into a plurality of sections, and a locking pin is embedded in each of the sections. roller.