Paper sheet multi-feed preventing member

Abstract

A paper sheet multi-feed preventing member 3 being planar includes an outer layer 8 which comes into contact with a paper sheet 5 and an inner layer 9 laminated on the outer layer 8, the inner layer 9 has a type A durometer hardness not less than A5 / S and not more than A60 / S, or an Asker-C hardness not less than C5 and not more than C50, and the outer layer 8 has a rubber hardness higher than that of the inner layer 9.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a paper sheet multi-feed preventing member having a planar shape, which is installed and used in a paper feed mechanism, etc., of a laser beam printer, etc., for separating a plurality of stacked paper sheets and supplying them to the laser beam printer, etc., one by one.[0002]For example, in a paper cassette or a paper feed tray, etc., of a laser beam printer (hereinafter, abbreviated to “LBP” in some cases), a paper feed mechanism for preventing erroneous feeding (multi-feed) of two or more paper sheets, stacked and accommodated in the paper cassette or paper feed tray, etc., while overlapping each other is provided. The paper feed mechanism usually includes a paper feed roller at least the outer peripheral surface of which is made of an elastomer such as rubber, and a paper sheet multi-feed preventing member in contact with the outer peripheral surface of the paper feed roller.[0003]The paper feed mechanism operate...

AI Technical Summary

Benefits of technology

The present invention provides a paper sheet multi-feed preventing member that has a planar shape and is excellent at separating paper sheets. It is designed to adapt to various types of paper sheets and is less likely to wear away or cause chatter vibration and screeching compared to conventional separation pads. The multi-feed preventing member includes an outer layer and an inner layer, with the rubber hardness of the inner layer being set within a predetermined range lower than the outer layer. This results in a more effective separation function and reduces friction with the paper sheet feed roller, reducing wear and tear on the pad.

Problems solved by technology

However, a conventional separation pad which is entirely made of an elastomer such as rubber integrally is small in contact length (nipping width) in the paper sheet feed direction with the paper feed roller, and easily slips from a paper sheet, so that the separating function described above cannot be sufficiently obtained.

Particularly, the kinds of paper sheets which the separation pad can separate are limited, and various kinds of paper sheets cannot be reliably separated.

Further, the conventional separation pad is easily worn away, and the thickness is reduced in a short time due to this wear, and further, the separating function is deteriorated.

One of the causes of easy wear of the separation pad is frequent friction with paper sheets caused by slipping.

The conventional separation pad has a small nipping width as described above, and a contact force caused by contact with the paper feed roller is easily concentrated at a comparatively narrow area, so that the load to be applied to the separation pad by the contact is great, and this is one of the causes of easy wear.

Further, the conventional separation pad easily causes chatter vibration due to friction with a paper sheet or a phenomenon called screeching that is an abnormal sound in conjunction with the friction.

The cause of these is also the small nipping width which causes a contact force of contact with the paper feed roller to easily concentrate at a narrow area and increases the load to be applied to the separation pad due to the contact.

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