JPS60112566A - Paper feed roller - Google Patents

Abstract

PURPOSE:To facilitate manufacture and to carry a paper reliably with high accuracy, by coating the outercircumference of core metal molded to be thicker in the central portion with rubber and forming into a tube. CONSTITUTION:The outercircumference of core metal 17 molded to be thicker in the center is coated with rubber 18 and formed into a tube. Since the rubber 18 is not required to be polished in accordance to the profile of core metal 17, manufacture is facilitated considerably. While since the core metal 17 is thicker in the center, the thickness of rubber is different at the central portion and the opposite ends to provide such effect as similar with a paper feed roller resulting in highly accurate and reliable paper feeding.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a paper feed roller, and particularly to a paper feed roller in a printer.

[Prior Art] A paper feed roller must transport paper accurately and reliably. For this purpose, the conventional paper feed roller is
As shown in a), the surface of the mandrel 1 is coated with rubber 2 to increase the friction between the paper and the roller.

However, such a cylindrical paper feed roller has a problem in that the paper tends to wrinkle during operation.

In order to solve this problem, the mandrel 3 is molded into a medium-height shape as shown in FIG. 1(b), and the rubber 4
A paper feed roller coated with molded and polished paper has been proposed.

This paper feed roller has an advantage in that the paper is less likely to wrinkle because it has a medium height.

However, the paper feed roller shown in FIG. 1(b) has the problem that it is not easy to precisely mold the rubber 4 to match the surface of the mandrel 3 to a medium-height shape, resulting in high costs. Ta.

[Object of the invention] The present invention has been made in view of the above-mentioned conventional problems,
The purpose is to provide a paper feed roller that can reliably transport paper without causing wrinkles and that can be easily manufactured.

[Summary of the Invention] In order to achieve the above object, the paper feed reroller according to the present invention is characterized in that: after molding D gold into a medium-high shape, the roller is coated with rubber and molded into a cylindrical shape.

[Embodiments of the Invention] Hereinafter, a paper feeding mechanism of an inkjet printer will be taken up as an embodiment of the present invention and explained in detail.

FIG. 2 is a schematic cross-sectional view of the printer.

In FIG. 2, the fanfold paper 6 placed in the paper feed box 5 is raised along the guide plate 7 by the rotation of the reference feed roller 8 in the direction of the arrow. Furthermore, the reference feed roller 8
The paper 6 that has passed between the pinch roller 9 and the feed roller 11 moves on the suction plate IO by rotation of the feed roller 11. Further, the paper 6 that has passed between the feed roller 11 and the pinch roller 12
is pulled by the rotation of the feed roller 13, passes between the feed roller 13 and the pinch roller 14, and falls into the storage box 15.

Since the rotational speeds of the feed rollers 8, 11 and 13 are increased in this order, the paper 6 is always pulled downstream and no sagging or the like occurs.

However, the moving speed of the paper 6 and the like are all determined by the rotational speed of the reference feed roller 8.

The inkjet unit 16 is a unit that jets ink toward the paper 6 that is attracted to the suction plate 10-1, and uses, for example, a bubble inkjet or the like.

3 and 4 are a partially cutaway side view and an exaggerated side sectional view of an embodiment in which the paper feed roller according to the present invention is applied to the reference feed roller 8. FIG.

As shown in an exaggerated manner in FIG. 4, the outer periphery of the mandrel 17 of the reference feed roller 8 is molded to have a medium height, and the outer periphery of the mandrel 17 is coated with rubber 18. The rubber 18 may be formed into a cylindrical shape simply by molding, or may be polished.

With this configuration, there is no need to mold and polish the rubber 18 into a medium-high shape, making manufacturing extremely easy. Moreover, since the core metal 17 has a middle height, the rubber thickness is different between the center part and both ends of the reference feed roller 8 (the center part is approximately 0.3
mm, peripheral area is 1.0-2. 0mm), Figure 1 (b
) The same effect as the paper feed roller shown in ) can be obtained.

[Effects of the Invention] As explained in detail below, the paper feed roller according to the present invention is extremely easy to manufacture, and also has high precision because it does not impair the effect of the mandrel formed in the middle and height. This has the great effect of allowing reliable paper feeding.

[Brief explanation of the drawing]

FIG. 1(a) is a cross-sectional side view of a conventional paper feed roller, FIG. 1(b) is a cross-sectional side view of an improved conventional paper feed roller, and FIG. 2 is a schematic diagram of an ink side printer. 3 is a partially cutaway side view of one embodiment of the paper feed roller according to the present invention, and FIG. 4 is an exaggerated cross-sectional side view of this embodiment. 1.3.17 meeting 411 Shinkin, 2,4,18... fist rubber
8. Fist/Reference feeding roller, 9, 12° 14... φ pinch roller, 11, 13... Feeding roller Fig. 1 (Q) Fig. 1 (b) Fig. 2 Fig. 3 Fig. 8 Fig. 4

Claims (1)

[Claims] (1) A paper feed roller characterized by having a cylindrical shape by covering the outer periphery of a mandrel molded to a medium height with rubber.