JPH0489728A - Paper feeding elastic body roller - Google Patents

Abstract

PURPOSE:To prevent a reduction in carrying force by providing line projections orthogonal to paper carrying direction on the surface of an elastic body roller, and forming the line projections into the line projections having a pitch less than 1mm and a top line width less than 0.5mm to minimize the contact area with paper at the time of friction. CONSTITUTION:Line projections 11 orthogonal to paper carrying direction are provided on the surface of an elastic body roller 10. The line projection 11 has a triangular form of a pitch P less than 1mm, and a top line width less than 0.5mm, and the height H is also less than 1mm. The formation of such fine line projections minimizes the contact area with a paper even in unpolished state, making it difficult to adhere paper dust, and further, as the roller is never smoothed, a reduction in carrying force can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding elastic roller used in a paper feeding mechanism of a copying machine, a printer of an information processing device, or the like.

[Conventional technology]

2. Description of the Related Art In general, paper feeding mechanisms of copiers, printers of information processing devices, and the like use elastic rollers that feed paper using frictional force. As such an elastic roller for paper feeding,
Roller with polished surface (hereinafter referred to as surface polished roller)
and a roller whose surface is not polished (hereinafter referred to as a surface-non-polished roller).

The above-mentioned surface polishing roller has been mainly used in the past because of its stable paper feeding performance, but it has the drawback that the manufacturing cost increases significantly due to the increase in the number of steps for polishing the surface.

In addition, since the surface polishing roller has a directional frictional force, for example, when using multiple paper feeding elastic rollers, if they are installed in the wrong direction, not only will the desired performance not be achieved, but the paper This has the disadvantage that it causes skew feeding, which causes paper feeding failure. FIG. 3 shows the measurement results of an experiment conducted to prove that the surface polishing roller has directionality. That is, in the experiment, the coefficient of friction relative to the surface roughness was measured when the surface polishing roller was used in the correct mounting direction (item use) and when it was used in the opposite mounting direction (reverse use). however,
load! 200g, peripheral speed 250/s, temperature 2
The temperature is 3°C and the humidity is 55%. The results show that the coefficient of friction is greater when using the item than when using the opposite eye. From this, it is clear that the surface polishing roller has isotropy.

On the other hand, the surface non-abrasive roller can reduce costs by omitting the polishing step, but has the disadvantage that paper waste adheres to the surface after repeated use, resulting in a significant decrease in conveying force. Note that even when a surface polishing roller is used for a long period of time, the conveying force decreases as the surface wear progresses. The surface roughness of the surface polishing roller is usually about 30 to 100 tt, and as the friction progresses on the surface, the polishing pattern decreases to only 0.21111.
Even if the surface of the product is worn, it becomes so-called slippery and becomes unusable.

Therefore, in order to obtain an elastic material roller for feeding paper that has a stable conveying force without polishing the surface, crystallization (2) ( 2)-・
- (hereinafter referred to as surface crystallization roller) (1
) has been developed and used.

[Problem to be solved by the invention]

By the way, the above-mentioned surface crystallization roller (1
), the height H of the crystallization (2) is about 1111, and the width of the tip line is also about 111, which means that the contact area with the paper is large, making it easy for paper debris to adhere. There is a large decrease in conveying force.

Figure 6 shows a surface polishing roller, a surface non-polishing roller, and a conventionally used surface crystallization roller (1) at a load of 20
These are the experimental results of a durability test conducted under paper passing conditions of 0 g and roller circumferential speed of 500 w/s. From this result, it was found that the surface polishing roller has stable paper feeding performance, and that the conveyance force of the surface polishing roller after long-term use is inferior to that of the surface polishing roller. It can be seen that as the surface wear of the - roller progresses, the difference in the conveying force between the roller and the surface-polishing roller increases, and the conveying force approaches that of the non-surface-polishing roller.

[Means to solve the problem]

As a result of various experiments and considerations to solve the problems recognized in the prior art, the inventors of the present invention have developed a paper feed system that is equivalent to or higher than that of a surface-polishing roller without the extra process of polishing the surface. We have succeeded in finding an elastic roller for paper feeding that can demonstrate its performance. In other words, on the surface, Fig. 7 (a) (b) (
Three surface crystallization rollers having the shape and dimensions (unit: ■) shown in c), pitch P, tip width, and crystallization height 11 were manufactured, and for these and the surface polishing roller, As a result of carrying out a durability test under paper passing conditions of a load of 200 g and a roller circumferential speed of 500+r+a/s, the experimental results shown in FIG. 8 were obtained. Incidentally, since the triangular crystallization shown in FIG. 7(a) has a pointed tip, there is no tip width.

From this experimental result, (a) When the crystallization pitch P becomes l un or more, the conveying force becomes smaller.

(b) If the width of the tip strip is 0.5a+c or more, the conveying force after long-term use will decrease.

(C) When the height H of crystallization exceeds 1 pin, molding becomes difficult.

It became clear that.

Therefore, based on the above experimental results, the present invention has developed an elastic material roller with crystallization perpendicular to the paper conveyance direction on the surface, in order to obtain an elastic material roller for paper feeding that exhibits paper feeding performance equivalent to or better than that of a surface-polished roller. This is a body roller in which the crystallization is formed into microcrystallization with a pitch of 1 mm or less and a tip width of 0.511 mm or less.

[Effect]

According to the elastic material roller for paper feeding of the present invention, the contact area with paper is small (paper scraps are difficult to adhere to), and the surface does not become so-called smooth even if surface abrasion progresses, so the conveyance force is reduced. decrease is small.

[Embodiment] FIGS. 1 and 2 show an embodiment of the paper feeding elastic roller according to the present invention.
0) has crystallization (11) (11
) - is a surface crystallization roller having the above-mentioned crystallization (11)
(11)- is formed into, for example, a triangular shape, and the pitch P of the crystallized (11) (11)- is l mm.
The crystallization (11) (11) is formed into microcrystallization.

According to the surface crystallization roller (10), the crystallization (11) (
11) - is formed in a triangular shape and the pitch P is formed to be microcrystallized within 1n, so the contact area with the paper is small (
It is difficult for paper waste to adhere to it, and it also has streaks (11) (11)
-, the surface roughness is rough, and even if the surface wear progresses, the surface does not become so-called smooth and the conveying force does not decrease much.

This is also clear from the experimental results shown in FIG. 8 mentioned above. In addition, when the height of crystallization (11) becomes 1 part or more,
Since it becomes difficult to mold the crystallized product (11), it is preferable to use one dish or less.

In the above example, the crystallization (11) (11) --- is formed in a triangular shape, but the present invention is not limited to this, and the pitch P of the crystallization (11) (11) is 1 m.
As long as the microcrystallization is within II and the width of the tip line is 0.5 inch++ or less, the shapes shown in FIGS. Further, although the paper feed elastic roller according to the present invention is mainly used for conveying plain paper, it goes without saying that it can also be applied to conveying sheets such as L-shaped sheets.

- (Effects of the Invention) As explained above, according to the present invention, an elastic roller for paper feeding having paper feeding performance equal to or higher than that of a surface-polishing roller can be produced without performing an extra process of polishing the surface. In addition, unlike surface polishing rollers, the frictional force has no directionality, so there is no difference in conveying force depending on the rotation direction.
For example, if multiple rollers are used and they are installed in the wrong direction, the performance may not be as expected as with surface polishing rollers, or the paper may become skewed, resulting in poor paper feeding. does not occur.

[Brief explanation of drawings]

Figures 1 and 2 are a front view and a partially enlarged side view showing an embodiment of the paper feeding elastic roller according to the present invention, and Figure 3 shows the directionality of the surface polishing roller. 4 and 5 are a front view and a partially enlarged side view of a conventional surface crystallization roller, and FIG. 6 is a graph of experimental data for a surface polishing roller, a surface non-polishing roller and a conventional Graph of durability test data for surface crystallization roller,
FIG. 7 is an explanatory diagram showing the crystallization shape and dimensions of the surface crystallization roller used in the experiment conducted to find the elastic material roller for paper feeding according to the present invention, and FIG. 3 is a graph of durability test data regarding the roller and the surface-polished roller. (P) (S) (H) Surface crystallization roller, (11) Crystallization pitch, Crystallization tip width, Crystallization height. Crystallization, Figure 1: Patent applicant Sumitomo Rubber Industries, Ltd. - Engraving of drawings (no change in content) Figure 5 Engraving of drawings (no change in content) Figure 3 Written amendment to procedure (method) Indication of the case Patent Application No. 202649 of 1990 Name of the invention Relationship to the case of person who corrects paper feeding elastic roller Name of patent applicant Sumitomo Rubber Industries, Ltd.

Claims (1)

[Claims] (1) An elastic roller with streaks perpendicular to the paper conveyance direction on its surface, the pitch of which is within 1 mm, and the width of the tip streaks being 0.5 m.
An elastic roller for sheet feeding, characterized in that it is formed into minute ridges of less than m.