JPS60258050A - Paper conveying roller - Google Patents

Abstract

PURPOSE:To keep a roller diameter in a highly accurate manner as well as to make paper conveyable at the specified speed, by applying material being large in a friction factor to a peripheral surface of a roller by means of thermal spraying, while forming such a frictional surface as being large in the friction factor and excellent in rigidity on the roller peripheral surface. CONSTITUTION:A driving roller 12 forms its frictional surface 12b by applying compound materials of ceramic and the like comprising chrome oxide, etc., being large in a friction factor to paper 14, to a peripheral surface of a roller blank excellent in rigidity by means of thermal spraying. The frictional surface 12b makes an acute-angular projection form whereby coherence with the paper 14 is excellent enough, equalized to the desired thickness and stickable with certainty, so that the paper 14 is conveyable at the specified speed all the time.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to paper conveyance rollers.

[Technical background of the invention]

FIG. 1 shows a paper conveyance mechanism in an image information reading or recording apparatus such as a RAXIMILE.

In this paper conveyance mechanism, a drive roller 1. is equipped with drive shafts 1a and 2a. ．． The power of a drive source 4 is transmitted to the drive source 2 through a power transmission system 3 such as a belt or gears. Further, each of the driven rollers 5 and 6 has one end fixed, and is always urged toward the drive roller 1.2 by a compression spring 7.

Therefore, the urging force of the spring 7 is transmitted to the paper 8 conveyed between the drive rollers 1, 2 and the driven roller 5.6 via the driven roller 5.6. As a result, paper 8 becomes
The lower surface 8a is in close contact with the circumferential surfaces lb and 2b of the drive roller 1.degree. 20, and the material is conveyed according to the circumferential speed of the drive roller 1.degree. During this time, the information written on the paper 8 is read by the reading section 9, or the information is recorded on the paper 8 by the recording section 9a.

[Problems with background technology]

By the way, the driving roller 1.2 conventionally has a circumferential surface 1b,
2b was made of an organic material such as rubber or sponge, or was processed with metal knurling.

However, when organic materials such as rubber and sponge are used, the friction coefficient of the drive rollers 1 and 2 against the paper 8 is large, but when it is difficult to process the outer diameter of the rollers with high precision, The circumferential surface 1b is made of these organic materials because the diameter changes greatly depending on the temperature, and these organic materials may adhere to the paper 8 and have poor rigidity.

2b may be deformed, the conveyance speed of the paper 8 may change, and reading or recording may be disturbed. In addition, when using metal knurling, although it has high rigidity, the coefficient of friction is lower than that of organic materials such as rubber and sponge, and in addition, the shape of the tip is formed into a smooth protrusion by machining. In reality, the coefficient of friction is not very large, and as a result, the paper 8
Slips occur when the material is transported.

[Purpose of the invention]

In view of these circumstances, an object of the present invention is to provide a paper transport roller that can always maintain a highly accurate roller diameter and transport paper at a predetermined speed.

[Summary of the invention]

In order to achieve the above object, in the present invention, a material with a large coefficient of friction is adhered to the circumferential surface of a roller equipped with a drive shaft by thermal spraying, and a material with a high friction coefficient and high rigidity is applied to the circumferential surface of the roller. forming a surface.

[Embodiments of the invention]

FIG. 2 relates to the present invention, particularly showing a paper conveyance roller in an image information reading or recording apparatus such as a facsimile.

The paper conveying roller 11 includes a driving roller 12 having a driving shaft 12a and a driven roller 13. The drive roller 12 is made of a highly rigid roller material with
A ceramic such as chromium oxide or alumina oxide, or a composite material such as tungsten carbide, which has a large coefficient of friction, is adhered to the paper 14 by thermal spraying to form a friction surface 12b.
was formed.

Note that the surface roughness of this friction surface 12b is preferably within the range of 10 μm to 70 μm.

The friction surface 12b of the drive roller 12 formed by thermal spraying has an acute protrusion shape as shown in FIG.
High adhesion with. Moreover, the desired thickness can be uniformly
And it can be fixed securely.

In addition, in FIG. 2, the driving roller 12 and the driven roller 1
3, the present invention is not limited to the above embodiment, and the present invention is not limited to the above embodiment,
On the other hand, it goes without saying that the driven side, that is, the driven roller 13, may be a paper conveyance roller constituted by a pressure plate or the like.

〔Effect of the invention〕

As explained above, in the paper conveyance roller according to the present invention, a friction surface is formed by spraying a material with a large friction coefficient onto the circumferential surface of the roller equipped with a drive shaft, so that the material peels off from the roller. Therefore, since it is firmly in close contact with the paper and has rigidity, the paper can always be conveyed at a predetermined speed.

[Brief explanation of drawings]

FIG. 1 is a conceptual side view showing a paper conveyance mechanism in an image information reading or recording apparatus such as a facsimile, and FIG. 2 shows an embodiment of a paper conveyance roller according to the present invention. FIG. 3A is a conceptual side view thereof, FIG. 3B is a conceptual front view thereof, and FIG. 3 is an enlarged view showing the shape of the peripheral surface of the drive roller in the paper conveyance roller according to the present invention. 11... Paper transport roller, 12. Drive roller, 12a
... Drive shaft, 12b... Friction surface, 13... Followed roller, 14... Paper. 2b

Claims (1)

[Claims] A paper conveying roller characterized in that a friction surface is formed on the circumferential surface of the roller by thermally spraying a substance having a large coefficient of friction against the paper onto the circumferential surface of the roller provided with a drive shaft.