Roller with surface friction

Abstract

A roller is formed on an outer circumferential surface from inner to outer side with a coarsened layer and a finished layer. The coarsened layer is formed by way of subjecting the roller to coarsening, and the finished layer is formed by way of subjecting the roller to a predetermined surface finishing. A plurality of micro sharp points are formed on the finished layer to give the roller with high surface friction, so that the roller is suitable for push feeding sheet material.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a roller with surface friction, and more particularly to a roller having a coarsened layer and a finished layer formed on an outer circumferential surface thereof, and a plurality of micro sharp points formed on the finished layer to produce high surface friction on the roller. BACKGROUND OF THE INVENTION [0002] A roller is an important element frequently used in different machines to push feed sheet material. For example, a roller is frequently used in a printer, a photocopier, and many other office machines to roll on a top of a stack of sheet paper, so as to push and feed the sheet paper at the highest position of the stack. [0003] Most of the conventional rollers are produced to have a smooth outer circumferential surface that provides insufficient frictional force in push feeding the sheet material and results in idling of the roller. One of the conventional ways to solve this problem is to form patterns on the roll...

AI Technical Summary

Benefits of technology

[0007] To achieve the above and other objects, the roller with surface friction according to the present invention includes a coarsened layer and a finished layer formed on an outer circumferential surface of the roller from inner to outer side. The coarsened layer is formed by way of subjecting the roller to coarsening, and the finished layer is formed by way of subjecting the roller to a predetermined surface finishing. And, a plurality of micro sharp points are formed on the finished layer to give the roller with high surface friction, so that the roller is suitable for push feeding sheet material.

Problems solved by technology

Most of the conventional rollers are produced to have a smooth outer circumferential surface that provides insufficient frictional force in push feeding the sheet material and results in idling of the roller.

This solution is highly labor and time consuming, particularly for a metal roller.

However, the putting of the rubber sleeve over the roller increases not only the manufacturing cost but also the manufacturing process of the roller.

Moreover, the rubber sleeve has low thermal plasticity and durability, and tends to become worn out or hardened after being used over a prolonged time, preventing the roller from stably push feeding the sheet material.

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