JPS6288741A - Paper feeder - Google Patents

Abstract

PURPOSE:To feed sheets of paper one by one in a stable manner even in case of thick paper, by attaching two types of members, different in a friction factor each, to the side of a paper feed tray. CONSTITUTION:A part C of the pad 4 installed in the side of a paper feed tray is of cork or the like small in a friction factor, while a part (d) is of sponge rubber or the like large in the friction factor. The paper housed inside the paper feed tray 1 is fed to the inside of a printer from the topper one in order by a rotary rubber roller 3 or the like. When double feeding is going to occur, each tip and side end of sheets of the paper (a) and (b), especially this tip, hitches on the sponge rubber (d) of the pad 4 whereby its forward movement is prevented, thus the double feeding is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a paper feeding device that automatically picks up paper sheets one by one.

[Background of the invention]

In conventional paper feeding devices, the paper stacked on the paper feeding tray is fed into the inside of the printing machine etc. by paper feeding means such as rotating rubber rollers, but due to the effects of temperature and frictional resistance between the sheets, etc. There are cases where two or more sheets of paper are fed into a printing machine, etc. at the same time, and as a countermeasure to this problem, a method is used to press both sides of the leading edge of the paper with a claw called a snapper on the paper delivery port side. However, it had the disadvantage that it was difficult to obtain stable paper feeding, especially for thick paper. Incidentally, as a related device of this type, the technique described in Japanese Utility Model Application Laid-Open No. 57-138838 is well known.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems and to provide a paper feeding device that is less expensive.

[Summary of the invention]

By using two types of members with different coefficients of friction, this method makes it possible to easily feed even thick paper one sheet at a time.

[Embodiments of the invention]

The present invention is characterized in that a pad 4 having two members having different coefficients of friction is attached to the side surface of the end of the paper feed opening of the paper feed tray 1. In addition, C of putt 4 above
The material is cork, etc., which has a small friction coefficient, and the d# material is sponge rubber, etc., which has a large friction coefficient.As shown in Fig. 2, the paper feed row 23
By changing the shapes of pads 4 c and d attached to the side of the paper feed tray 1 with the shapes c and d on the lower surface of the paper as shown in Figures 2 to 4, it is possible to remove paper that is double fed. For paper with relatively weak feeding force, i.e. paper other than the topmost paper, use sponge rubber, etc.
This is an attempt to hinder its progress.

Moreover, by forming the pad 4 in the shape shown in FIGS. 2 to 4, it can be placed under the paper feed roller 3, and even if the holder d is slightly shifted vertically, the paper can be separated.

A stack 2 of papers stored in a paper feed tray 1 is fed into a printing machine (not shown) in order from the topmost paper by a paper feeding means 3 such as a rotating rubber roller. When double feeding is about to occur, as shown in FIG. , since the topmost paper a is fed particularly forcefully, the paper gets caught on the sponge rubber d of the pad 4 that contacts the leading edges of papers a and b, and only paper a is separated and moves forward, resulting in double feeding. [Effects of the Invention] According to the present invention, by attaching two types of members with different coefficients of friction to the side surface of the paper feed tray, paper feeding is achieved even when paper is fed, especially for thick paper. This has the effect of stably feeding sheets one by one.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of preventing double feeding at the paper feed outlet, and FIGS. 3 and 4 are diagrams of the attachment shape of the pad 4. 1... Paper feed tray, 2... Paper, 3... Paper feed rubber roller, 4... Pad, 5... Spring.

Claims (1)

[Claims] 1. A pad with two types of members with different friction coefficients is installed on the side of the paper feed outlet of the paper feed tray, and the boundary between the pad members with different friction coefficients is used to remove the topmost paper stored in the paper feed tray. A paper feeding device characterized by easily feeding only paper.